From pthubert@cisco.com Thu Aug 1 03:05:36 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5083911E80FD for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 03:05:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.527 X-Spam-Level: X-Spam-Status: No, score=-10.527 tagged_above=-999 required=5 tests=[AWL=0.071, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hBTu5AxNyZam for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 03:05:31 -0700 (PDT) Received: from rcdn-iport-3.cisco.com (rcdn-iport-3.cisco.com [173.37.86.74]) by ietfa.amsl.com (Postfix) with ESMTP id 7006C21F9815 for <6tsch@ietf.org>; Thu, 1 Aug 2013 03:05:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5031; q=dns/txt; s=iport; t=1375351520; x=1376561120; h=from:to:subject:date:message-id:mime-version; bh=qJndUKUyzbHUFyExlYTFcGwHeC+HaGTu83hiiM18J2c=; b=CoSmf4lOhx3amKqrgemvorDSWTFEVlIOHc/ciYWVzMkgz73pXXFkYGtB zUfaSWzzFIWoYDHPCBV4/uXbP6d/TFx5yTzob7k7zPTjjkPes9jof4VIH EV1fHGu9jhd8OsPAFcZWP6Y9COfmJwVYYYU0+YZzs6EEmRyDlNKCkdfHS Y=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjwFAOsx+lGtJV2Z/2dsb2JhbABBGoJCRDVQhXG4VoEgFnSCJgEELV4BKlYmAQQbAYgHDDKYI6BXj1YtgyRzA6ktgxSCKg X-IronPort-AV: E=Sophos;i="4.89,793,1367971200"; d="scan'208,217";a="242209648" Received: from rcdn-core-2.cisco.com ([173.37.93.153]) by rcdn-iport-3.cisco.com with ESMTP; 01 Aug 2013 10:05:19 +0000 Received: from xhc-rcd-x09.cisco.com (xhc-rcd-x09.cisco.com [173.37.183.83]) by rcdn-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id r71A5JV4007822 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for <6tsch@ietf.org>; Thu, 1 Aug 2013 10:05:19 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.104]) by xhc-rcd-x09.cisco.com ([173.37.183.83]) with mapi id 14.02.0318.004; Thu, 1 Aug 2013 05:05:18 -0500 From: "Pascal Thubert (pthubert)" To: "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: BoF recording Thread-Index: Ac6OnnlI4gBj43DKTA6Veev+OlW4Qw== Date: Thu, 1 Aug 2013 10:05:18 +0000 Deferred-Delivery: Thu, 1 Aug 2013 10:05:00 +0000 Message-ID: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.214.6] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD8413C65FDxmbrcdx01ciscoc_" MIME-Version: 1.0 Subject: [6tsch] BoF recording X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 10:05:36 -0000 --_000_E045AECD98228444A58C61C200AE1BD8413C65FDxmbrcdx01ciscoc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear all: A webex slideshow and the speaker voice as captured by the IETF tools are a= vailable separately: The mp3 recording is here http://www.ietf.org/audio/ietf87/ietf87-bellevue-= 20130730-1520-pm2.mp3 The webex recording (with no sound) is here https://cisco.webex.com/ciscosa= les/lsr.php?AT=3Dpb&SP=3DMC&rID=3D70245732&rKey=3D20ae6ae1b0abddfd All slides are here https://bitbucket.org/6tsch/meetings/src/a5501873ad51cb= 8caa0869202bb19756fb445929/130730_ietf-87_berlin?at=3Dmaster We are finalizing the meeting page https://bitbucket.org/6tsch/meetings/wik= i/130730b_ietf-87_berlin_bof Cheers, Pascal --_000_E045AECD98228444A58C61C200AE1BD8413C65FDxmbrcdx01ciscoc_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear all:

 

A webex slideshow and the speaker voice as captured = by the IETF tools are available separately:

The mp3 recording is here http://www.ietf.org/audio/ietf87/ietf87-bellevue-20130730-1520-pm2.mp3<= o:p>

The webex recording (with no sound) is here https://ci= sco.webex.com/ciscosales/lsr.php?AT=3Dpb&SP=3DMC&rID=3D70245732&= ;rKey=3D20ae6ae1b0abddfd

All slides are here https://bitbucket.org/6tsch/meetings/src/a5501873ad51cb8caa0869202bb19756fb= 445929/130730_ietf-87_berlin?at=3Dmaster

We are finalizing the meeting page https://bitbucket.org/6tsch/meetings/wiki/130730b_ietf-87_berl= in_bof

 

Cheers,

 

Pascal

 

 

 

--_000_E045AECD98228444A58C61C200AE1BD8413C65FDxmbrcdx01ciscoc_-- From twatteyne@gmail.com Thu Aug 1 06:14:31 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A4DB621F92B8 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 06:14:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 15MkRQBsgmbE for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 06:14:30 -0700 (PDT) Received: from mail-pa0-x230.google.com (mail-pa0-x230.google.com [IPv6:2607:f8b0:400e:c03::230]) by ietfa.amsl.com (Postfix) with ESMTP id 4049821E8149 for <6tsch@ietf.org>; Thu, 1 Aug 2013 06:13:06 -0700 (PDT) Received: by mail-pa0-f48.google.com with SMTP id kp13so2109564pab.7 for <6tsch@ietf.org>; Thu, 01 Aug 2013 06:13:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:x-google-sender-auth:message-id :subject:to:content-type; bh=srIxNfnDJ4NM8mW82SXDjqOBXGA+ZB5XAwsASPnOxwE=; b=CIHpacN1B2a9YjBE4sPF3ZVIhr0q2joBDFq9RaJt1ft7Inx9XIZPCDJbx7LKHo8Ksl FbwgbgdzYZ5J2mPX+t3TU5JYgvVogJDdT3G2UWCLC2BDYhlZofDpJ2HswBrOHS75p77f ZyeJr3oz+i5zRjesuEVwSISNyhROXCOyw8VwWkb4QBIZ0ZzdD+CONpP+gCtsYRVbktaS 9c+Pa6oeq/IbY5sDv8ipNGnEhdgysInwz8t8UjL+wGrdqJHytxUgU5wrFTvJ1nnt6iV5 tcgNI9eEEmB8tLpzpa86AXBYkSEP2GbC4p0flsxmlT/QdYSFiq3aGkIDTGMAxLvYQ++k YoNw== X-Received: by 10.66.37.43 with SMTP id v11mr4042315paj.108.1375362785842; Thu, 01 Aug 2013 06:13:05 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Thu, 1 Aug 2013 06:12:45 -0700 (PDT) From: Thomas Watteyne Date: Thu, 1 Aug 2013 15:12:45 +0200 X-Google-Sender-Auth: u7Q3tTKqZgXcwfI98MHgLPw2h64 Message-ID: To: 6TSCH <6tsch@ietf.org>, "Ted Lemon (ted.lemon@nominum.com)" , "Adrian Farrel (adrian@olddog.co.uk)" , Marc Blanchet Content-Type: multipart/alternative; boundary=bcaec5304f45499c0304e2e29a07 Subject: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 13:14:31 -0000 --bcaec5304f45499c0304e2e29a07 Content-Type: text/plain; charset=ISO-8859-1 All, Thanks to all for for the effort of putting together the BoF on Tuesday! One of the suggestions was to simplify the charter, in particular by reducing the number of work items. After discussion and suggestions from numerous 6TSCH and other people here at the IETF, the chairs have created a new, simplified version of the draft, which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt This e-mail is to start a discussion on the ML about this revamped charter. Please send comments directly to this thread. Ideally, we would like to converge within a couple of days, so let's start the discussion right now. Pascal & Thomas --bcaec5304f45499c0304e2e29a07 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
All,

Thanks to all for for the effort o= f putting together the BoF on Tuesday! One of the suggestions was to simpli= fy the charter, in particular by reducing the number of work items.

After discussion and suggestions from numerous 6TSCH and oth= er people here at the IETF, the chairs have created a new, simplified versi= on of the draft, which we have uploaded in the repo at:

This e-mail is to start a discussion on the ML about th= is revamped charter. Please send comments directly to this thread. Ideally,= we would like to converge within a couple of days, so let's start the = discussion right now.

Pascal & Thomas
--bcaec5304f45499c0304e2e29a07-- From alfredo.grieco@gmail.com Thu Aug 1 07:58:17 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4E6E321F9DCA for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 07:58:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vR8Su8GiM70H for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 07:58:16 -0700 (PDT) Received: from mail-la0-x232.google.com (mail-la0-x232.google.com [IPv6:2a00:1450:4010:c03::232]) by ietfa.amsl.com (Postfix) with ESMTP id CC3C421E80FF for <6tsch@ietf.org>; Thu, 1 Aug 2013 07:58:10 -0700 (PDT) Received: by mail-la0-f50.google.com with SMTP id fn20so1496550lab.9 for <6tsch@ietf.org>; Thu, 01 Aug 2013 07:58:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=J8L2chjplYlONFSE4+qpeHZ4rLiOTBraEnOSneSlKt4=; b=GDTBERSetLcA8TEA0E/38HyJzIY1EhPeR3jRwmYgXmn6IijqjpsYSnM7Qfwn1Ab4I0 HzB7c6aXqyKuHF3QZPCAyDBK9l6W9Mfc2QU6xwuiV0RKIUP0WkCoofvEWSEZyEztba79 6zMrv63FAqZ/JDGUK2buf0riSbjZetwGiMLPUIESlbgcC0C93l8Y+ZXwy8gmAS52OUZJ DhRMHjpnpMH0xNTUQKQmAZhrI9NnwFGt5mWGxWTKDc1avVTTbSW+tkDO16Wmz8qaTJTw s7y3BFBdia+2Lg2nNlJ6zdXZB0ebOORRLqhU6Lb3cRpGC60La3RNYHe0DqBvqU6QJp/S Z9mQ== MIME-Version: 1.0 X-Received: by 10.152.26.2 with SMTP id h2mr942791lag.52.1375369089674; Thu, 01 Aug 2013 07:58:09 -0700 (PDT) Received: by 10.114.79.103 with HTTP; Thu, 1 Aug 2013 07:58:09 -0700 (PDT) In-Reply-To: References: Date: Thu, 1 Aug 2013 16:58:09 +0200 Message-ID: From: Alfredo Grieco To: Thomas Watteyne Content-Type: multipart/alternative; boundary=089e0158be4406783404e2e4129e Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 14:58:17 -0000 X-List-Received-Date: Thu, 01 Aug 2013 14:58:17 -0000 --089e0158be4406783404e2e4129e Content-Type: text/plain; charset=ISO-8859-1 Hi all, Like very much this new charter: it is now much more clear what the WG is going to do. Thanks a lot for having reworked it. Cheers Al On Thursday, August 1, 2013, Thomas Watteyne wrote: > All, > > Thanks to all for for the effort of putting together the BoF on Tuesday! > One of the suggestions was to simplify the charter, in particular by > reducing the number of work items. > > After discussion and suggestions from numerous 6TSCH and other people here > at the IETF, the chairs have created a new, simplified version of the > draft, which we have uploaded in the repo at: > > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt > > This e-mail is to start a discussion on the ML about this revamped > charter. Please send comments directly to this thread. Ideally, we would > like to converge within a couple of days, so let's start the discussion > right now. > > Pascal & Thomas > --089e0158be4406783404e2e4129e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi all,

Like very much this new charter: it is now much = more clear what the=A0WG is going to do.

<= div>Thanks a lot for having reworked it.

Cheers

Al

On Thursday, August 1, 2013, Thomas Wa= tteyne wrote:
All,
=
Thanks to all for for the effort of putting together the BoF on = Tuesday! One of the suggestions was to simplify the charter, in particular = by reducing the number of work items.

After discussion and suggestions from numerous 6TSCH and oth= er people here at the IETF, the chairs have created a new, simplified versi= on of the draft, which we have uploaded in the repo at:

This e-mail is to start a discussion on the ML about th= is revamped charter. Please send comments directly to this thread. Ideally,= we would like to converge within a couple of days, so let's start the = discussion right now.

Pascal & Thomas
--089e0158be4406783404e2e4129e-- From emmanuel.baccelli@gmail.com Thu Aug 1 08:40:50 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 236FE21F9E68 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 08:40:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.349 X-Spam-Level: X-Spam-Status: No, score=-1.349 tagged_above=-999 required=5 tests=[AWL=0.628, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UMvHXmipnzeq for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 08:40:49 -0700 (PDT) Received: from mail-ob0-x22d.google.com (mail-ob0-x22d.google.com [IPv6:2607:f8b0:4003:c01::22d]) by ietfa.amsl.com (Postfix) with ESMTP id 5DC7121E818D for <6tsch@ietf.org>; Thu, 1 Aug 2013 08:40:48 -0700 (PDT) Received: by mail-ob0-f173.google.com with SMTP id ta17so4198654obb.32 for <6tsch@ietf.org>; Thu, 01 Aug 2013 08:40:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:cc:content-type; bh=nnEcwuepDr04lQSCTy2h35vjQRNpFs93saNyxNjr4ck=; b=EdPKFsjGB9SP2FgoPwjJyDiJmJxp3KbadPYHRjnqal2exhajPDVNrhOjcfCxCYctWV LAvhuCYS8pzki1HqnMZep5f4+kniHwfml4++HivD2FarREdB36yCkomevpicE5NnjKu6 bXXSqc6lexamA3qN4bblfJq+THJuVFNF9ms6EA2NQ8lXaRQET8YQHe0fGTh5dbrPjltP uiV4GvkU6QTJc/fEncxZ7dZ1fMqPcD9bvLTljHyjV/y8i2w4B9oDzN6y3khIcbQyqrsD W41pyQZhtTmxs2vvpcSGOvsL7UMj1BHy+OZJluBIPu4u12MYvMkslNM62Q3FDOLCSAjf aG4w== X-Received: by 10.60.38.234 with SMTP id j10mr1718894oek.42.1375371647563; Thu, 01 Aug 2013 08:40:47 -0700 (PDT) MIME-Version: 1.0 Sender: emmanuel.baccelli@gmail.com Received: by 10.76.177.67 with HTTP; Thu, 1 Aug 2013 08:40:26 -0700 (PDT) In-Reply-To: References: From: Emmanuel Baccelli Date: Thu, 1 Aug 2013 17:40:26 +0200 X-Google-Sender-Auth: xYU93PisTl0pBVzCy5MVYZfyIQ0 Message-ID: To: Thomas Watteyne Content-Type: multipart/alternative; boundary=089e0149c2107cbf5b04e2e4aa18 Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 15:40:50 -0000 --089e0149c2107cbf5b04e2e4aa18 Content-Type: text/plain; charset=ISO-8859-1 Hi Thomas, Hi Pascal, thanks for the revamped charter. The timeline is explicit and the scope is now much more focused, while not blocking the horizon for non-yet-chartered work awaiting us next, down the line. So it looks good to me. This is just my personal opinion, and I don't know if this is the right place/time to say this, but I also wanted to mention that I don't see a real need for a second BOF if there's a consensus on a revamped charter proposal. Best, Emmanuel On Thu, Aug 1, 2013 at 4:31 PM, Thomas Watteyne wrote: > All, > > Thanks to all for for the effort of putting together the BoF on Tuesday! > One of the suggestions was to simplify the charter, in particular by > reducing the number of work items. > > After discussion and suggestions from numerous 6TSCH and other people here > at the IETF, the chairs have created a new, simplified version of the > draft, which we have uploaded in the repo at: > > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt > > This e-mail is to start a discussion on the ML about this revamped > charter. Please send comments directly to this thread. Ideally, we would > like to converge within a couple of days, so let's start the discussion > right now. > > Pascal & Thomas > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --089e0149c2107cbf5b04e2e4aa18 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Hi Thomas, Hi Pascal,

thanks for the re= vamped charter. The timeline is explicit and the scope is now much more foc= used, while not blocking the horizon for non-yet-chartered work awaiting us= next, down the line. So it looks good to me.=A0

This is just my personal opinion, and I don= 't know if this is the right place/time to say this, but I also wanted = to mention that I don't see a real need for a second BOF if there's= a consensus on a revamped charter proposal.

Best,
Emmanuel



On Thu, Aug 1, 2013 at 4:31 PM, Thomas Watteyne <wat= teyne@eecs.berkeley.edu> wrote:
All,

Tha= nks to all for for the effort of putting together the BoF on Tuesday! One o= f the suggestions was to simplify the charter, in particular by reducing th= e number of work items.

After discussion and suggestions from numerous 6TSCH and oth= er people here at the IETF, the chairs have created a new, simplified versi= on of the draft, which we have uploaded in the repo at:

This e-mail is to start a discussion on the ML about th= is revamped charter. Please send comments directly to this thread. Ideally,= we would like to converge within a couple of days, so let's start the = discussion right now.

Pascal & Thomas

_______________________________________________
6tsch mailing list
6tsch@ietf.org
h= ttps://www.ietf.org/mailman/listinfo/6tsch


--089e0149c2107cbf5b04e2e4aa18-- From dominique.barthel@orange.com Thu Aug 1 10:02:05 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C1A4721E8202 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 10:02:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.597 X-Spam-Level: X-Spam-Status: No, score=-2.597 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, UNPARSEABLE_RELAY=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XMC+pQG+Aaqi for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 10:02:01 -0700 (PDT) Received: from relais-inet.francetelecom.com (relais-ias92.francetelecom.com [193.251.215.92]) by ietfa.amsl.com (Postfix) with ESMTP id A9C1421E8195 for <6tsch@ietf.org>; Thu, 1 Aug 2013 10:01:59 -0700 (PDT) Received: from omfedm06.si.francetelecom.fr (unknown [xx.xx.xx.2]) by omfedm11.si.francetelecom.fr (ESMTP service) with ESMTP id 88F6E3B4352; Thu, 1 Aug 2013 19:01:51 +0200 (CEST) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.186]) by omfedm06.si.francetelecom.fr (ESMTP service) with ESMTP id 6B8F927C0EF; Thu, 1 Aug 2013 19:01:51 +0200 (CEST) Received: from PEXCVZYM13.corporate.adroot.infra.ftgroup ([fe80::cc7e:e40b:42ef:164e]) by PEXCVZYH01.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.02.0328.009; Thu, 1 Aug 2013 19:01:51 +0200 From: To: Thomas Watteyne , 6TSCH <6tsch@ietf.org> Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOjsPDsQAxhMzVX0iraSTIg2U/TpmAivGA Date: Thu, 1 Aug 2013 17:01:51 +0000 Message-ID: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.197.38.3] Content-Type: multipart/alternative; boundary="_000_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7PEXCVZYM13corpo_" MIME-Version: 1.0 X-PMX-Version: 5.6.1.2065439, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2013.7.1.45418 Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 17:02:05 -0000 --_000_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7PEXCVZYM13corpo_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Woww, now this is very focused. This should give us a clear framework to st= art our work, and hopefully expand later. Overall, I believe the current Work Items description could elaborate a bit= more. Specifically, please find below my questions, followed by other minor remar= ks/suggested changes. Dominique --------- Questions =AB Produce "Timeslot Management Methods and Formats" to describe how an en= tity can manage the TSCH schedule on a 6TSCH node". The schedule is somewhe= re described as being static. In this sentence, the schedule can be "manage= d" by an "entity". What prevents the so-called entity to "manage" the sched= ule, i.e. allocate slots, based on some information such as traffic require= ments? In which case, what does "static" mean? Probably "imposed upon the 6= top layer" (if such notion still exists) by some external mechanism. "or learnt by a node when joining the network, possibly in a format as defi= ned by work item 1." Do you mean the description of the schedule would be provided "in-band" to = the joining node (through EB's or similar mechanism). This does not seem to= fit the description of work item 1, where the "entity" is an upper layer. = Or do you mean as a payload transported on a default cell/link between uppe= r layer entities ? "3. Produce "6TSCH architecture" to describe the design and implementation = of 6TSCH networks. This document will highlight the different architectural= blocks and signaling flows, including the operation of the network in the = presence of multiple BBRs." Does this include any form of multi-hop ND? In light of the discussion at 6= lo BoF on this topic, how will compare to 6lowpan-ND? Sentences unclear to me "A dynamic schedule for traffic that is switched at the timeslot level may = for example be computed centrally by an entity located on the backbone." T= his sentence is complex and unclear to me overall. Consider rephrasing? "Produce "Timeslot Management Methods and Formats" to describe how an entit= y can manage the TSCH schedule on a 6TSCH node". Is it assumed that everybo= dy knows what "entity" is supposed to mean in this context? Minor changes s/in front of interference/in front of narrow-band interference s/- implementers guide, collecting/ - implementers guide: this document wil= l collect/ s/- coexistence guide, providing/- coexistence guide: this document will pr= ovide/ English writing s/and ISA100.11a, and/and ISA100.11a, while/ s/Initially the document/Initially, the document s/be adapted dynamically/be dynamically adapted/ De : 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de T= homas Watteyne Envoy=E9 : jeudi 1 ao=FBt 2013 15:13 =C0 : 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddo= g.co.uk); Marc Blanchet Objet : [6tsch] updated charter per BoF suggestion: thoughts? All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7PEXCVZYM13corpo_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Woww, now = this is very focused. This should give us a clear framework to start our wo= rk, and hopefully expand later.

Overall, I= believe the current Work Items description could elaborate a bit more.

Specifical= ly, please find below my questions, followed by other minor remarks/suggest= ed changes.

 = ;

Dominique<= o:p>

 = ;

---------<= o:p>

 = ;

Questions<= o:p>

=AB P= roduce "Timeslot Management Methods and Formats" to describe how = an entity can manage the TSCH schedule on a 6TSCH node”. The schedule= is somewhere described as being static. In this sentence, the schedule can be “ma= naged” by an “entity”. What prevents the so-called entity= to “manage” the schedule, i.e. allocate slots, based on some i= nformation such as traffic requirements? In which case, what does “st= atic” mean? Probably “imposed upon the 6top layer” (if such notion s= till exists) by some external mechanism.

 = ;

“or = learnt by a node when joining the network, possibly in a format as defined = by work item 1.”

Do you mea= n the description of the schedule would be provided “in-band” t= o the joining node (through EB’s or similar mechanism). This does not seem to fit the description of work item 1, where the “entity”= is an upper layer. Or do you mean as a payload transported on a default ce= ll/link between upper layer entities ?

 = ;

“3. = Produce "6TSCH architecture" to describe the design and implement= ation of 6TSCH networks. This document will highlight the different archite= ctural blocks and signaling flows, including the operation of the network in the = presence of multiple BBRs.”

Does this = include any form of multi-hop ND? In light of the discussion at 6lo BoF on = this topic, how will compare to 6lowpan-ND?

 = ;

Sentences = unclear to me

“A d= ynamic schedule for traffic that is switched at the timeslot level may for = example be computed centrally by an entity located on the backbone.”  This sentence is complex and unclear to me overall. Consider rephras= ing?

“Pro= duce "Timeslot Management Methods and Formats" to describe how an= entity can manage the TSCH schedule on a 6TSCH node”. Is it assumed = that everybody knows what “entity” is supposed to mean in this cont= ext?

 = ;

Minor changes<= /span>

s/in front= of interference/in front of narrow-band interference

s/- implem= enters guide, collecting/ - implementers guide: this= document will collect/

s/- coexis= tence guide, providing/- coexistence guide: this document will provide/

 = ;

English writing

s/and ISA1= 00.11a, and/and ISA100.11a, while/

s/Initiall= y the document/Initially, the document

s/be adapt= ed dynamically/be dynamically adapted/

 = ;

 = ;

 = ;

 = ;

De : 6tsc= h-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
Envoy=E9 : jeudi 1 ao=FBt 2013 15:13
=C0 : 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (= adrian@olddog.co.uk); Marc Blanchet
Objet : [6tsch] updated charter per BoF suggestion: thoughts?

 

All,

 

Thanks to all for for the effort of putting together= the BoF on Tuesday! One of the suggestions was to simplify the charter, in= particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSCH= and other people here at the IETF, the chairs have created a new, simplifi= ed version of the draft, which we have uploaded in the repo at:<= /p>

 

This e-mail is to start a discussion on the ML about= this revamped charter. Please send comments directly to this thread. Ideal= ly, we would like to converge within a couple of days, so let's start the d= iscussion right now.

 

Pascal & Thomas

______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
--_000_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7PEXCVZYM13corpo_-- From Ted.Lemon@nominum.com Thu Aug 1 12:17:03 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B98A611E8144 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 12:17:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.532 X-Spam-Level: X-Spam-Status: No, score=-106.532 tagged_above=-999 required=5 tests=[AWL=0.067, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nhOpmW8A7118 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 12:16:57 -0700 (PDT) Received: from exprod7og113.obsmtp.com (exprod7og113.obsmtp.com [64.18.2.179]) by ietfa.amsl.com (Postfix) with ESMTP id 02E3411E8131 for <6tsch@ietf.org>; Thu, 1 Aug 2013 12:16:56 -0700 (PDT) Received: from shell-too.nominum.com ([64.89.228.229]) (using TLSv1) by exprod7ob113.postini.com ([64.18.6.12]) with SMTP ID DSNKUfq0KNdgZ64Ka2GA8nBQWdX3QEA0k0jZ@postini.com; Thu, 01 Aug 2013 12:16:57 PDT Received: from archivist.nominum.com (archivist.nominum.com [64.89.228.108]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "*.nominum.com", Issuer "Go Daddy Secure Certification Authority" (verified OK)) by shell-too.nominum.com (Postfix) with ESMTP id 19A771B8257 for <6tsch@ietf.org>; Thu, 1 Aug 2013 12:16:56 -0700 (PDT) Received: from webmail.nominum.com (cas-02.win.nominum.com [64.89.228.132]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "mail.nominum.com", Issuer "Go Daddy Secure Certification Authority" (verified OK)) by archivist.nominum.com (Postfix) with ESMTPS id 8B186190065; Thu, 1 Aug 2013 12:16:53 -0700 (PDT) (envelope-from Ted.Lemon@nominum.com) Received: from MBX-01.WIN.NOMINUM.COM ([64.89.228.133]) by CAS-02.WIN.NOMINUM.COM ([64.89.228.132]) with mapi id 14.02.0318.004; Thu, 1 Aug 2013 12:16:53 -0700 From: Ted Lemon To: Emmanuel Baccelli Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOjrjdzIHbwmgHAk2jwpPRba4O0ZmA8skAgAA8fQA= Date: Thu, 1 Aug 2013 19:16:52 +0000 Message-ID: <8D23D4052ABE7A4490E77B1A012B63077523CDCC@mbx-01.win.nominum.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.1.10] Content-Type: text/plain; charset="iso-8859-1" Content-ID: <37FB54C3ABF2874A9BCF2359C61AFE46@nominum.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: Thomas Watteyne , "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 19:17:03 -0000 On Aug 1, 2013, at 5:40 PM, Emmanuel Baccelli = wrote: > This is just my personal opinion, and I don't know if this is the right p= lace/time to say this, but I also wanted to mention that I don't see a real= need for a second BOF if there's a consensus on a revamped charter proposa= l. If you guys can agree on a charter before the next IETF, it is clear to me = that there is support in the IETF for doing this work, and energy in the wo= rking group for doing it, so I will be happy to put forward the charter as = a proposed working group. You could also ask Brian Haberman, since there'= s a decent chance he will wind up as responsible AD if a working group is f= ormed. AFAIK either way is fine. From maria-rita.palattella@uni.lu Thu Aug 1 12:23:32 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A9DD711E8141 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 12:23:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.598 X-Spam-Level: X-Spam-Status: No, score=-6.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8Vz8lw8c4VaF for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 12:23:28 -0700 (PDT) Received: from hercules.uni.lu (hercules.uni.lu [158.64.76.33]) by ietfa.amsl.com (Postfix) with ESMTP id 9183311E8144 for <6tsch@ietf.org>; Thu, 1 Aug 2013 12:23:26 -0700 (PDT) X-IronPort-AV: E=Sophos;i="4.89,796,1367964000"; d="scan'208,217";a="25716598" Received: from unknown (HELO Travis.uni.lux) ([10.21.2.19]) by hercules.uni.lu with ESMTP; 01 Aug 2013 21:23:25 +0200 Received: from HOSHI.uni.lux ([fe80::499:a33:4e68:4af9]) by Travis.uni.lux ([fe80::653b:7b8e:4641:a750%10]) with mapi id 14.03.0123.003; Thu, 1 Aug 2013 21:23:25 +0200 From: Maria Rita PALATTELLA To: Thomas Watteyne , 6TSCH <6tsch@ietf.org>, "Ted Lemon (ted.lemon@nominum.com)" , "Adrian Farrel (adrian@olddog.co.uk)" , Marc Blanchet Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOjsPC1uoqmLhGDEqeFG8WlzfgapmAt4KA Date: Thu, 1 Aug 2013 19:23:24 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.34.0.9] Content-Type: multipart/alternative; boundary="_000_F085911F642A6847987ADA23E611780D1858CEF1hoshiunilux_" MIME-Version: 1.0 Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 19:23:32 -0000 --_000_F085911F642A6847987ADA23E611780D1858CEF1hoshiunilux_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Pascal, Thomas, Many thanks for this new version of the charter. It is pretty much simplifi= ed, and at the same time it still keeps all the key work-items that we have= been targeting so far. Well done! I have few minor comments: 1) The first sentence sound a bit strange: "The Working Group will focus on enabling IPv6 over the TSCH mode of the IE= EE802.15.4e standard. The scope of the WG includes one or more LLNs, each o= ne connected to a backbone through one or more BackBone Routers (BBRs)." What about this slightly different version: "The Working Group will focus on enabling IPv6 over IEEE802.15.4e T= SCH networks, including one or more LLNs, each one connected to a backbone through one or more BackBone Routers (BBRs)= ." 2) Why in "Description of Working Group" session and "Work Items" ses= sion, we talk in term of timeslot, instead of cells? A single element of th= e schedule is actually a cell, given by (timeslot offset, channeloffset)? Maria Rita From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Thursday, August 01, 2013 3:13 PM To: 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.= co.uk); Marc Blanchet Subject: [6tsch] updated charter per BoF suggestion: thoughts? All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas --_000_F085911F642A6847987ADA23E611780D1858CEF1hoshiunilux_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Pascal, Thomas,

 <= /p>

Many thanks for this new = version of the charter. It is pretty much simplified, and at the same time = it still keeps all the key work-items that we have been targeting so far. Well done!

 <= /p>

I have few minor comments= :

1) = ;     The first sentenc= e sound a bit strange:

“The Working Group will focus on enabling IPv= 6 over the TSCH mode of the IEEE802.15.4e standard. The scope of the WG includes = one or more LLNs, each one

connected to a backbone throu= gh one or more BackBone Routers (BBRs).”

 <= /span>

What about this sl= ightly different version:

        “The Work= ing Group will focus on enabling IPv6 over IEEE802.15.4e TSCH networks, inc= luding one or more LLNs, each one

        connected to a = backbone through one or more BackBone Routers (BBRs).”

 

=
2)     =
 Why in “Description of Work=
ing Group” session and  “Work Items” session, we tal=
k in term of timeslot, instead of cells? A single element of the schedule i=
s actually a cell, given by (timeslot offset, channeloffset)?

 <= /span>

 <= /p>

Maria Rita

 <= /p>

 <= /p>

 <= /p>

From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
Sent: Thursday, August 01, 2013 3:13 PM
To: 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@= olddog.co.uk); Marc Blanchet
Subject: [6tsch] updated charter per BoF suggestion: thoughts?<= /o:p>

 

All,

 

Thanks to all for for the effort of putting together= the BoF on Tuesday! One of the suggestions was to simplify the charter, in= particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSCH= and other people here at the IETF, the chairs have created a new, simplifi= ed version of the draft, which we have uploaded in the repo at:<= /p>

 

This e-mail is to start a discussion on the ML about= this revamped charter. Please send comments directly to this thread. Ideal= ly, we would like to converge within a couple of days, so let's start the d= iscussion right now.

 

Pascal & Thomas

--_000_F085911F642A6847987ADA23E611780D1858CEF1hoshiunilux_-- From qinwang@berkeley.edu Thu Aug 1 13:05:51 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A458F11E80F1 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 13:05:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.832 X-Spam-Level: X-Spam-Status: No, score=-2.832 tagged_above=-999 required=5 tests=[AWL=0.144, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ckzi3RaPOGkk for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 13:05:47 -0700 (PDT) Received: from mail-oa0-f43.google.com (mail-oa0-f43.google.com [209.85.219.43]) by ietfa.amsl.com (Postfix) with ESMTP id A0EA811E80E3 for <6tsch@ietf.org>; Thu, 1 Aug 2013 13:05:47 -0700 (PDT) Received: by mail-oa0-f43.google.com with SMTP id i10so5380913oag.30 for <6tsch@ietf.org>; Thu, 01 Aug 2013 13:05:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:x-gm-message-state; bh=qZMsDznmmxrrx78gyI9nvkxREAr4sQdZMPbAD1uwspo=; b=nJsStdBlZwNI++D5VkDL3ZTa+mQdZ99DMti4WGyhQE+BHze47cL6+vcFrRWtaIK5yo a910P9Dsux5bLfKxs1MzkzvIcqlpdieqdJAuD7AosXKcXqnF16gmNe3QbV6J+qddvuX6 D+LXbpCVxIqz3ENgS7vXm/yWtSiM591N56ygwOuJmSgTm9BAZQsZUAGAgqihsPz+wxo5 suIIfL3Y/1Mt75ReE7hIbdRgw14mUHxUDxA4f9cz4nCymP2ekizqTgB2ZHPpO7R6E7GW S4BNEuqyX0x4eIUvG6jXBGB0pZ+666gz0axWi8MkzVoeX3tbIMm/xn1zbvU3X/+nlfzh qteQ== MIME-Version: 1.0 X-Received: by 10.50.97.40 with SMTP id dx8mr360508igb.30.1375387543415; Thu, 01 Aug 2013 13:05:43 -0700 (PDT) Received: by 10.64.171.82 with HTTP; Thu, 1 Aug 2013 13:05:43 -0700 (PDT) In-Reply-To: References: Date: Fri, 2 Aug 2013 04:05:43 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7b111a29f43b8b04e2e85ddd X-Gm-Message-State: ALoCoQn/lus5OyVsICTG8E/wIIprHJcMO3lfUhlz1LicB5mGAcbhJ3VangQ4Bi+dNIt3J7klts6g Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 20:05:51 -0000 --047d7b111a29f43b8b04e2e85ddd Content-Type: text/plain; charset=ISO-8859-1 Hi all, Regarding to the first work item: ************************************************************ 1. Produce "Timeslot Management Methods and Formats" to describe how an entity can manage the TSCH schedule on a 6TSCH node, and query timeslot information from that node. Metrics such as timeslot quality reports are in scope, but the actual bindings to transport operation are not. *********************************************************** My suggestion and comment is as follows. (1) Name: "Multichannel Timeslot Management Methods and Messages". The reason for the modification is: a) not only "TS" but also "CH" have to be managed; b) "Messages" includes both exchange time sequence and format, which need to be described. (2) replace "timeslot" in the paragraph with "multichannel timeslots" (3) It is not clear where the entity is. Should we clarify? Thanks Qin On Thu, Aug 1, 2013 at 9:12 PM, Thomas Watteyne wrote: > All, > > Thanks to all for for the effort of putting together the BoF on Tuesday! > One of the suggestions was to simplify the charter, in particular by > reducing the number of work items. > > After discussion and suggestions from numerous 6TSCH and other people here > at the IETF, the chairs have created a new, simplified version of the > draft, which we have uploaded in the repo at: > > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt > > This e-mail is to start a discussion on the ML about this revamped > charter. Please send comments directly to this thread. Ideally, we would > like to converge within a couple of days, so let's start the discussion > right now. > > Pascal & Thomas > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b111a29f43b8b04e2e85ddd Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Hi all,

Regarding to the first work ite= m:

***************************= *********************************

1. Produce "Timeslot Management Methods and Formats" to describe how an entity can manage the TSCH schedule on a 6TSCH node, and query timeslot information from that node. Metrics such as timeslot quality reports are in scope, but the actual bindi= ngs to transport operation are not.

***********************************************************

My suggestion and comment is as follows.

(1) Name: "Multichannel Timeslot Management Methods and Messages". The reason for the m= odification is:=A0

=A0 =A0 =A0= a) not only "TS" but also "CH" have to be managed;=A0

=A0 =A0 =A0b) "Messages" inclu= des both exchange time sequence and format, which need to be described.

(2) replace "timeslot" = in the paragraph with "multichannel timeslots"

(3) It is not clear where the entity is.= Should we clarify?

Thanks

Qin





On Thu, Aug 1, = 2013 at 9:12 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu&= gt; wrote:
All,

Tha= nks to all for for the effort of putting together the BoF on Tuesday! One o= f the suggestions was to simplify the charter, in particular by reducing th= e number of work items.

After discussion and suggestions from numerous 6TSCH and oth= er people here at the IETF, the chairs have created a new, simplified versi= on of the draft, which we have uploaded in the repo at:

This e-mail is to start a discussion on the ML about th= is revamped charter. Please send comments directly to this thread. Ideally,= we would like to converge within a couple of days, so let's start the = discussion right now.

Pascal & Thomas

_______________________________________________
6tsch mailing list
6tsch@ietf.org
h= ttps://www.ietf.org/mailman/listinfo/6tsch


--047d7b111a29f43b8b04e2e85ddd-- From qinwang@berkeley.edu Thu Aug 1 14:15:11 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 352AE21E8281 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 14:15:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.846 X-Spam-Level: X-Spam-Status: No, score=-2.846 tagged_above=-999 required=5 tests=[AWL=0.130, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id op2oTMLlbMW6 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 14:15:00 -0700 (PDT) Received: from mail-ob0-f175.google.com (mail-ob0-f175.google.com [209.85.214.175]) by ietfa.amsl.com (Postfix) with ESMTP id E08A921E8294 for <6tsch@ietf.org>; Thu, 1 Aug 2013 14:10:55 -0700 (PDT) Received: by mail-ob0-f175.google.com with SMTP id xn12so4944354obc.34 for <6tsch@ietf.org>; Thu, 01 Aug 2013 14:10:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:x-gm-message-state; bh=y9eyYZkyMqOP++iYW74vnEKyNoBiZoor5B1oBooaTvk=; b=LOiGelAdXesYZFyg7rdyjRse7ya6FvNXQbEL1fa7agDLS6OTjj3ZEoXB6igZZ6VgjN rHL9sp5QnzDKPRR0mwXLT/7RIbZ8QKK88fE688OvrdLhCMui/NV4bLeshaHd0++fUBL0 eClEM/LqamlgDBn4BcPJEysm8k0fXvZ6l5BYCPK/TL/chJAVhHEU0d0L9ZuJC41vX0RI 6q0F//qU3WDYIWAnfcjZyCU+RHs6mcsKf7J2ZMdPUmCVXLv/Gau5w0jExgGUibG/xxyW Kp3BxQMwLtH4RGUCvnsnYNn/4QGntvhVPRLmiyrsAQLLGLT2UU9iYyB0LF8SnTU/2xDp Axrw== MIME-Version: 1.0 X-Received: by 10.42.132.134 with SMTP id d6mr321679ict.50.1375391454935; Thu, 01 Aug 2013 14:10:54 -0700 (PDT) Received: by 10.64.171.82 with HTTP; Thu, 1 Aug 2013 14:10:54 -0700 (PDT) In-Reply-To: References: Date: Fri, 2 Aug 2013 05:10:54 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=90e6ba3fcd7f194bf404e2e947ad X-Gm-Message-State: ALoCoQm/rgvgVCceF6tGNMWIN/TdtK+PQ25tmrgsiERzt9BW1AwnyzqhD+tfW7pKEZsxIn/drpyR Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 21:15:11 -0000 --90e6ba3fcd7f194bf404e2e947ad Content-Type: text/plain; charset=ISO-8859-1 Hi Thomas, Pascal and All, Regarding to the scope, i.e. "Description of Working Group", I would like to clarify my understanding on "static schedule", and "dynamic schedule" firstly. Actually, there are two parameters related to establishing and maintaining a TSCH schedule, one is about "who", which values are (centralized, decentralized); another one is about change over time, which values are (static, dynamic). In the current version of 6top, the two parameters are associated with each other (but not have to), i.e. "centralized" is associated with "static", because it is assumed that centralized can optimize resource and avoid collision; and "decentralized" is associated with "dynamic", because it is assumed collision can not avoided completely by local negotiation. The Charter says "Initially, the WG will define a framework to install a static schedule and run the Routing Protocol for LLNs (RPL) over that schedule. If successful, the intent is to recharter to allow for dynamic schedules......". It means: step-1: we define methods and messages for establishing TSCH schedule in the way of (centralized, static); step-2: we define methods and messages for establishing TSCH schedule in the way of (centralized, dynamic) and (decentralized, dynamic) ; Correct? Based one above, how do you think the combination (decentralized, dynamic)? For example, allow establishing schedule locally, but do not allow change, or in another word, change must be instructed by upper layer, instead of by the sublayer. Thanks Qin On Thu, Aug 1, 2013 at 9:12 PM, Thomas Watteyne wrote: > All, > > Thanks to all for for the effort of putting together the BoF on Tuesday! > One of the suggestions was to simplify the charter, in particular by > reducing the number of work items. > > After discussion and suggestions from numerous 6TSCH and other people here > at the IETF, the chairs have created a new, simplified version of the > draft, which we have uploaded in the repo at: > > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt > > This e-mail is to start a discussion on the ML about this revamped > charter. Please send comments directly to this thread. Ideally, we would > like to converge within a couple of days, so let's start the discussion > right now. > > Pascal & Thomas > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --90e6ba3fcd7f194bf404e2e947ad Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Hi Thomas, Pascal and All,

Regarding to= the scope, i.e. "Description of Working Group", I= would like to clarify my understanding on "static schedule", and= "dynamic schedule" firstly.=A0

Actually, there are two parameters related to establish= ing and maintaining a TSCH schedule, one is about "who", which va= lues are (centralized, decentralized); another one is about change over tim= e, which values are (static, dynamic). In the current version of 6top, the = two parameters are associated with each other (but not have to), i.e. "= ;centralized" is associated with "static", because it is ass= umed that centralized can optimize resource and avoid collision; and "= decentralized" is associated with "dynamic", because it is a= ssumed collision can not avoided completely by local negotiation.

The Charter says =A0"Initially, the WG wil= l define a framework to install a static schedule and=A0
run the Routing Protocol for LLNs (RPL) over that schedule.=A0= If successful, the intent is to recharter to allow for dynam= ic schedules......". =A0
It means:=A0
step-1: we define methods and messages for esta= blishing TSCH schedule in the way of (centralized, static);=A0
st= ep-2: we define =A0methods and messages for establishing TSCH schedule in t= he way of (centralized, dynamic) and =A0(decentralized, dynamic)=A0;=A0

Correct?

Based one above, how = do you think the combination (decentralized, dynamic)? For example, allow e= stablishing schedule locally, but do not allow change, or in another word, = change must be instructed by upper layer, instead of by the sublayer.

Thanks
Qin






On Thu, Aug 1, 2013 at 9:12 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wrote:
All,

Tha= nks to all for for the effort of putting together the BoF on Tuesday! One o= f the suggestions was to simplify the charter, in particular by reducing th= e number of work items.

After discussion and suggestions from numerous 6TSCH and oth= er people here at the IETF, the chairs have created a new, simplified versi= on of the draft, which we have uploaded in the repo at:

This e-mail is to start a discussion on the ML about th= is revamped charter. Please send comments directly to this thread. Ideally,= we would like to converge within a couple of days, so let's start the = discussion right now.

Pascal & Thomas

_______________________________________________
6tsch mailing list
6tsch@ietf.org
h= ttps://www.ietf.org/mailman/listinfo/6tsch


--90e6ba3fcd7f194bf404e2e947ad-- From rafa@um.es Thu Aug 1 14:15:22 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7E34621E8280 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 14:15:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[AWL=-0.001, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id U+Xr6vDnSPHE for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 14:15:10 -0700 (PDT) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id C484B21E82A3 for <6tsch@ietf.org>; Thu, 1 Aug 2013 14:11:13 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id 86AEF5395F; Thu, 1 Aug 2013 23:11:10 +0200 (CEST) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id sPow6wl8Zr80; Thu, 1 Aug 2013 23:11:10 +0200 (CEST) Received: from dhcp-161b.meeting.ietf.org (dhcp-161b.meeting.ietf.org [130.129.22.27]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: rafa) by xenon11.um.es (Postfix) with ESMTPSA id 3E641537AB; Thu, 1 Aug 2013 23:11:04 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_9E3D0EBF-38AC-4EEE-A4B2-5696E2CDC47F" From: Rafa Marin Lopez In-Reply-To: Date: Thu, 1 Aug 2013 23:11:04 +0200 Message-Id: <523EF154-B9B3-4FE1-9E1F-891F3288524B@um.es> References: To: Thomas Watteyne X-Mailer: Apple Mail (2.1283) Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 21:15:22 -0000 --Apple-Mail=_9E3D0EBF-38AC-4EEE-A4B2-5696E2CDC47F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Dear Chairs: Thanks for this new charter. Evidently, it is more condensed and = simplified, which is good, taking into account the comments received = during the BOF.=20 I have also noticed that security part has been completely removed. = Although my interest was specially based on that part, I understand that = these aspects could be covered in the future, when the current work for = this charter is finished. Best Regards.=20 El 01/08/2013, a las 15:12, Thomas Watteyne escribi=F3: > All, >=20 > Thanks to all for for the effort of putting together the BoF on = Tuesday! One of the suggestions was to simplify the charter, in = particular by reducing the number of work items. >=20 > After discussion and suggestions from numerous 6TSCH and other people = here at the IETF, the chairs have created a new, simplified version of = the draft, which we have uploaded in the repo at: > = https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6ts= ch-00.txt >=20 > This e-mail is to start a discussion on the ML about this revamped = charter. Please send comments directly to this thread. Ideally, we would = like to converge within a couple of days, so let's start the discussion = right now. >=20 > Pascal & Thomas > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch ------------------------------------------------------- Rafael Marin Lopez, PhD Dept. Information and Communications Engineering (DIIC) Faculty of Computer Science-University of Murcia 30100 Murcia - Spain Telf: +34868888501 Fax: +34868884151 e-mail: rafa@um.es ------------------------------------------------------- --Apple-Mail=_9E3D0EBF-38AC-4EEE-A4B2-5696E2CDC47F Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1 Dear = Chairs:

Thanks for this new charter. Evidently, it is = more condensed and simplified, which is good, taking into account the = comments received during the BOF. 

I have = also noticed that security part has been completely removed. Although my = interest was specially based on that part, I understand that these = aspects could be covered in the future, when the current work for this = charter is finished.

Best = Regards. 
El 01/08/2013, a las 15:12, Thomas Watteyne = escribi=F3:

All,

Thanks to all for = for the effort of putting together the BoF on Tuesday! One of the = suggestions was to simplify the charter, in particular by reducing the = number of work items.

After discussion and suggestions from numerous 6TSCH and = other people here at the IETF, the chairs have created a new, simplified = version of the draft, which we have uploaded in the repo = at:

This e-mail is to start a discussion on the ML about = this revamped charter. Please send comments directly to this thread. = Ideally, we would like to converge within a couple of days, so let's = start the discussion right now.

Pascal & Thomas
_______________________________________________
6tsch mailing = list
6tsch@ietf.org
https://www.ietf.org/= mailman/listinfo/6tsch

-------------------------------------------------------
<= div>Rafael Marin Lopez, PhD
Dept. Information and = Communications Engineering (DIIC)
Faculty of Computer = Science-University of Murcia
30100 Murcia - = Spain
Telf: +34868888501 Fax: +34868884151 e-mail: rafa@um.es
----------------------= ---------------------------------




= --Apple-Mail=_9E3D0EBF-38AC-4EEE-A4B2-5696E2CDC47F-- From diego.dujovne@mail.udp.cl Thu Aug 1 14:15:47 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3023E11E8182 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 14:15:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u7nEnOVAfZQG for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 14:15:36 -0700 (PDT) Received: from mail-wi0-f176.google.com (mail-wi0-f176.google.com [209.85.212.176]) by ietfa.amsl.com (Postfix) with ESMTP id 0F1E121E82C5 for <6tsch@ietf.org>; Thu, 1 Aug 2013 14:11:33 -0700 (PDT) Received: by mail-wi0-f176.google.com with SMTP id f14so47037wiw.9 for <6tsch@ietf.org>; Thu, 01 Aug 2013 14:11:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding:x-gm-message-state; bh=qPjNTwKUCNeoMWG8pw4NbsObHYH9+978a+tetO4xwjM=; b=N+SEEZ9z/XlSOEaGWl5TPW+9JcGqFf0jZj1MyT7Pz/68XylIMT6k3wNyzcFpSvuXKm hsGP4iG7nPRA0uyc4vi6073mLSgUZlDLEv/t6vB3tR8tAYuC+iF/jpk28GolncaTHnjP 9UJGJorYHFy7MvprHRdmf00f4eW9Nj5Dh0GZPMIZEnqIW8bcsvXoV6RnjnmfzO7zlpx6 NiGsZCFX61Z8PwhJGzNWOmjgdoarXIcji5dkbYkXlIsAM61bVXg7wRBFLgFXfQ5dUqeR EHcjepqycDaiihtt5KQcmX7yMkPHDJNKw44q+8IlnN7McQ7QZvfYFDIY9e+l15ImWz4k kt/w== MIME-Version: 1.0 X-Received: by 10.194.203.73 with SMTP id ko9mr2613855wjc.79.1375391492402; Thu, 01 Aug 2013 14:11:32 -0700 (PDT) Received: by 10.194.122.138 with HTTP; Thu, 1 Aug 2013 14:11:32 -0700 (PDT) In-Reply-To: References: Date: Thu, 1 Aug 2013 23:11:32 +0200 Message-ID: From: "Prof. Diego Dujovne" To: Thomas Watteyne Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Gm-Message-State: ALoCoQnYPAqQ+4+8DMrL2IAxBKpHqOUf/3g8YBzrAo69+h79VgC32qYrflCd2vbXgw5JJunaHJbo Cc: 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Aug 2013 21:15:47 -0000 I accept the charter as it is stated on charter-ietf-6tsch-00.txt Diego Dujovne 2013/8/1 Thomas Watteyne : > All, > > Thanks to all for for the effort of putting together the BoF on Tuesday! = One > of the suggestions was to simplify the charter, in particular by reducing > the number of work items. > > After discussion and suggestions from numerous 6TSCH and other people her= e > at the IETF, the chairs have created a new, simplified version of the dra= ft, > which we have uploaded in the repo at: > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6t= sch-00.txt > > This e-mail is to start a discussion on the ML about this revamped charte= r. > Please send comments directly to this thread. Ideally, we would like to > converge within a couple of days, so let's start the discussion right now= . > > Pascal & Thomas > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > --=20 DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 From xvilajosana@berkeley.edu Thu Aug 1 21:34:55 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A1C421E8245 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 21:34:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.643 X-Spam-Level: X-Spam-Status: No, score=-2.643 tagged_above=-999 required=5 tests=[AWL=0.333, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xDimqYV-NNhj for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 21:34:51 -0700 (PDT) Received: from mail-pa0-f49.google.com (mail-pa0-f49.google.com [209.85.220.49]) by ietfa.amsl.com (Postfix) with ESMTP id 7220721E8054 for <6tsch@ietf.org>; Thu, 1 Aug 2013 21:34:51 -0700 (PDT) Received: by mail-pa0-f49.google.com with SMTP id bi5so224722pad.36 for <6tsch@ietf.org>; Thu, 01 Aug 2013 21:34:51 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:reply-to:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:x-gm-message-state; bh=x8hvyIAQYgm+qJ+X2JL74B/qSsfVIzrCiVHoF4KdsvY=; b=QnokZM7XfhBD4V5YATqHNuiGgtQNqpSs7NrE5iQaADMyv47KmF313mSGNtwyVTaAzh kd//7VDnbpN0Z/Imk4hRpy119TjiTNtxSvoXnuq5cNIVEDg+YqhIzF5gYLVT01cts+xH a8vBQiWklY5FVygosQ9rsEvRUr8hlxmAvEfcRazBanJXOSVOdj6eEDufgXiOjPsBeZHR YepUpA3zjt+pGM0IJAd0n9tcbguJN0EyTPOA0olghAVYnlL1XI5QsspzLPm+v+igCoat zc6DiDphR+nOluk20w81rd9tvP5E4TTUNQEfsgwxYWUsSHeXqKIw9xHQ934hKpe1OxLx 9KoA== MIME-Version: 1.0 X-Received: by 10.68.143.199 with SMTP id sg7mr5689320pbb.13.1375418091139; Thu, 01 Aug 2013 21:34:51 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Thu, 1 Aug 2013 21:34:51 -0700 (PDT) In-Reply-To: References: Date: Fri, 2 Aug 2013 06:34:51 +0200 Message-ID: From: Xavier Vilajosana Guillen To: "Prof. Diego Dujovne" Content-Type: multipart/alternative; boundary=047d7b2e3f06bd7f2d04e2ef7a1c X-Gm-Message-State: ALoCoQnigb2aSQYpHorqrWZmLD51jOCvO0Fj/pgl9SfH0dzgmHI9dSA7wsbJzUIEJpw1nZK/2mmf Cc: Thomas Watteyne , 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 04:34:55 -0000 --047d7b2e3f06bd7f2d04e2ef7a1c Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Great work. Nothing else to add! my vote on it! X On Thu, Aug 1, 2013 at 11:11 PM, Prof. Diego Dujovne < diego.dujovne@mail.udp.cl> wrote: > I accept the charter as it is stated on charter-ietf-6tsch-00.txt > > Diego Dujovne > > 2013/8/1 Thomas Watteyne : > > All, > > > > Thanks to all for for the effort of putting together the BoF on Tuesday= ! > One > > of the suggestions was to simplify the charter, in particular by reduci= ng > > the number of work items. > > > > After discussion and suggestions from numerous 6TSCH and other people > here > > at the IETF, the chairs have created a new, simplified version of the > draft, > > which we have uploaded in the repo at: > > > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6t= sch-00.txt > > > > This e-mail is to start a discussion on the ML about this revamped > charter. > > Please send comments directly to this thread. Ideally, we would like to > > converge within a couple of days, so let's start the discussion right > now. > > > > Pascal & Thomas > > > > _______________________________________________ > > 6tsch mailing list > > 6tsch@ietf.org > > https://www.ietf.org/mailman/listinfo/6tsch > > > > > > -- > DIEGO DUJOVNE > Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones > Facultad de Ingenier=EDa UDP > www.ingenieria.udp.cl > (56 2) 676 8125 > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > --047d7b2e3f06bd7f2d04e2ef7a1c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Great work. Nothing else to add! my vote on it!
X


On Thu, A= ug 1, 2013 at 11:11 PM, Prof. Diego Dujovne <diego.dujovne@mail.= udp.cl> wrote:
I accept the charter as it is stated on char= ter-ietf-6tsch-00.txt

Diego Dujovne

2013/8/1 Thomas Watteyne <= watteyne@eecs.berkeley.edu>:
> All,
>
> Thanks to all for for the effort of putting together the BoF on Tuesda= y! One
> of the suggestions was to simplify the charter, in particular by reduc= ing
> the number of work items.
>
> After discussion and suggestions from numerous 6TSCH and other people = here
> at the IETF, the chairs have created a new, simplified version of the = draft,
> which we have uploaded in the repo at:
> https://bitbucket.org/6tsch/cha= rter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt
>
> This e-mail is to start a discussion on the ML about this revamped cha= rter.
> Please send comments directly to this thread. Ideally, we would like t= o
> converge within a couple of days, so let's start the discussion ri= ght now.
>
> Pascal & Thomas
>
> ________________________________________= _______
> 6tsch mailing list
> 6tsch@ietf.org
> https://www.ietf.org/mailman/listinfo/6tsch
>



--
DIEGO DUJOVNE
Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
www.ingenieria.u= dp.cl
(56 2) 676 8125
___________________________________= ____________
6tsch mailing list
6tsch@ietf.org
h= ttps://www.ietf.org/mailman/listinfo/6tsch

--047d7b2e3f06bd7f2d04e2ef7a1c-- From pieter@demil.be Thu Aug 1 21:48:34 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DFEFE11E81C7 for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 21:48:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.202 X-Spam-Level: X-Spam-Status: No, score=-5.202 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=1.396, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bPA3gDjNMDRS for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 21:48:30 -0700 (PDT) Received: from smtp2.ugent.be (smtp2.ugent.be [157.193.49.126]) by ietfa.amsl.com (Postfix) with ESMTP id E1DFE11E81B2 for <6tsch@ietf.org>; Thu, 1 Aug 2013 21:48:29 -0700 (PDT) Received: from localhost (mcheck2.ugent.be [157.193.49.249]) by smtp2.ugent.be (Postfix) with ESMTP id 7F94412C69D; Fri, 2 Aug 2013 06:48:28 +0200 (CEST) X-Virus-Scanned: by UGent DICT Received: from smtp2.ugent.be ([157.193.49.126]) by localhost (mcheck2.UGent.be [157.193.43.11]) (amavisd-new, port 10024) with ESMTP id 4GrwNFvR9QuQ; Fri, 2 Aug 2013 06:48:27 +0200 (CEST) Received: from [192.168.1.5] (20.17-242-81.adsl-dyn.isp.belgacom.be [81.242.17.20]) (Authenticated sender: pdemil) by smtp2.ugent.be (Postfix) with ESMTPSA id 24A6812C68B; Fri, 2 Aug 2013 06:48:27 +0200 (CEST) References: Mime-Version: 1.0 (1.0) In-Reply-To: Content-Type: multipart/alternative; boundary=Apple-Mail-C68D21B7-D71C-4025-8E46-F652DC53E328 Content-Transfer-Encoding: 7bit Message-Id: X-Mailer: iPhone Mail (10B143) From: Pieter De Mil Date: Fri, 2 Aug 2013 06:48:27 +0200 To: Thomas Watteyne X-Miltered: at jchkm1 with ID 51FB3A1A.003 by Joe's j-chkmail (http://helpdesk.ugent.be/email/)! X-j-chkmail-Enveloppe: 51FB3A1A.003 from 20.17-242-81.adsl-dyn.isp.belgacom.be/20.17-242-81.adsl-dyn.isp.belgacom.be/81.242.17.20/[192.168.1.5]/ X-j-chkmail-Score: MSGID : 51FB3A1A.003 on smtp2.ugent.be : j-chkmail score : . : R=. U=. O=# B=0.000 -> S=0.083 X-j-chkmail-Status: Ham Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 04:48:35 -0000 --Apple-Mail-C68D21B7-D71C-4025-8E46-F652DC53E328 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Hi all, I support the charter. Do we have to add milestones? Best, Pieter Op 1-aug.-2013 om 15:12 heeft Thomas Watteyne h= et volgende geschreven: > All, >=20 > Thanks to all for for the effort of putting together the BoF on Tuesday! O= ne of the suggestions was to simplify the charter, in particular by reducing= the number of work items. >=20 > After discussion and suggestions from numerous 6TSCH and other people here= at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6ts= ch-00.txt >=20 > This e-mail is to start a discussion on the ML about this revamped charter= . Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. >=20 > Pascal & Thomas > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch --Apple-Mail-C68D21B7-D71C-4025-8E46-F652DC53E328 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit
Hi all,

I support the charter.

Do we have to add milestones?

Best,
Pieter

Op 1-aug.-2013 om 15:12 heeft Thomas Watteyne <watteyne@eecs.berkeley.edu> het volgende geschreven:

All,

Thanks to all for for the effort of putting together the BoF on Tuesday! One of the suggestions was to simplify the charter, in particular by reducing the number of work items.

After discussion and suggestions from numerous 6TSCH and other people here at the IETF, the chairs have created a new, simplified version of the draft, which we have uploaded in the repo at:

This e-mail is to start a discussion on the ML about this revamped charter. Please send comments directly to this thread. Ideally, we would like to converge within a couple of days, so let's start the discussion right now.

Pascal & Thomas
_______________________________________________
6tsch mailing list
6tsch@ietf.org
https://www.ietf.org/mailman/listinfo/6tsch
--Apple-Mail-C68D21B7-D71C-4025-8E46-F652DC53E328-- From yoshihiro.ohba@toshiba.co.jp Thu Aug 1 23:06:33 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 025D611E823D for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 23:06:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.628 X-Spam-Level: X-Spam-Status: No, score=-4.628 tagged_above=-999 required=5 tests=[AWL=-0.540, BAYES_00=-2.599, HELO_EQ_JP=1.244, HOST_EQ_JP=1.265, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4, UNPARSEABLE_RELAY=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3H3C2e+j1bVm for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 23:06:27 -0700 (PDT) Received: from imx2.toshiba.co.jp (inet-tsb5.toshiba.co.jp [202.33.96.24]) by ietfa.amsl.com (Postfix) with ESMTP id D16EE11E8249 for <6tsch@ietf.org>; Thu, 1 Aug 2013 23:06:26 -0700 (PDT) Received: from tsbmgw-mgw02.tsbmgw-mgw02.toshiba.co.jp ([133.199.200.50]) by imx2.toshiba.co.jp with ESMTP id r7266KIL009702 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 2 Aug 2013 15:06:20 +0900 (JST) Received: from tsbmgw-mgw02 (localhost [127.0.0.1]) by tsbmgw-mgw02.tsbmgw-mgw02.toshiba.co.jp (8.13.8/8.14.5) with ESMTP id r7266KL5005969; Fri, 2 Aug 2013 15:06:20 +0900 Received: from localhost ([127.0.0.1]) by tsbmgw-mgw02 (JAMES SMTP Server 2.3.1) with SMTP ID 427; Fri, 2 Aug 2013 15:06:20 +0900 (JST) Received: from arc1.toshiba.co.jp ([133.199.194.235]) by tsbmgw-mgw02.tsbmgw-mgw02.toshiba.co.jp (8.13.8/8.14.5) with ESMTP id r7266KPi005965; Fri, 2 Aug 2013 15:06:20 +0900 Received: (from root@localhost) by arc1.toshiba.co.jp id r7266KhV014316; Fri, 2 Aug 2013 15:06:20 +0900 (JST) Received: from unknown [133.199.192.144] by arc1.toshiba.co.jp with ESMTP id RAA14315; Fri, 2 Aug 2013 15:06:20 +0900 Received: from mx.toshiba.co.jp (localhost [127.0.0.1]) by ovp2.toshiba.co.jp with ESMTP id r7266KCq015867; Fri, 2 Aug 2013 15:06:20 +0900 (JST) Received: from TGXML330.toshiba.local by toshiba.co.jp id r7266JlT010649; Fri, 2 Aug 2013 15:06:19 +0900 (JST) Received: from TGXML338.toshiba.local ([169.254.4.59]) by TGXML330.toshiba.local ([133.199.60.204]) with mapi id 14.03.0146.000; Fri, 2 Aug 2013 15:06:19 +0900 From: To: , <6tsch@ietf.org>, , , Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOjsPDgPWygeAHr0WtuCYux7hRT5mBZrQA Date: Fri, 2 Aug 2013 06:06:19 +0000 Message-ID: <674F70E5F2BE564CB06B6901FD3DD78B1883E337@tgxml338.toshiba.local> References: In-Reply-To: Accept-Language: ja-JP, en-US Content-Language: ja-JP x-originating-ip: [133.199.18.199] msscp.transfermailtomossagent: 103 Content-Type: multipart/alternative; boundary="_000_674F70E5F2BE564CB06B6901FD3DD78B1883E337tgxml338toshiba_" MIME-Version: 1.0 Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 06:06:33 -0000 --_000_674F70E5F2BE564CB06B6901FD3DD78B1883E337tgxml338toshiba_ Content-Type: text/plain; charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable I agree on the revised charter. This is really a reasonable set of works t= o focus in the next few F2F meeting cycles. Yoshihiro Ohba From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Thursday, August 01, 2013 10:13 PM To: 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.= co.uk); Marc Blanchet Subject: [6tsch] updated charter per BoF suggestion: thoughts? All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas --_000_674F70E5F2BE564CB06B6901FD3DD78B1883E337tgxml338toshiba_ Content-Type: text/html; charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable

I agree on t= he revised charter.  This is really a reasonable set of works to focus= in the next few F2F meeting cycles.

 <= /o:p>

Yoshihiro Oh= ba

 <= /o:p>

 <= /o:p>

From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
Sent: Thursday, August 01, 2013 10:13 PM
To: 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@= olddog.co.uk); Marc Blanchet
Subject: [6tsch] updated charter per BoF suggestion: thoughts?<= /o:p>

 

All,

 

Thanks to all for for the effort of putting togeth= er the BoF on Tuesday! One of the suggestions was to simplify the charter, = in particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TS= CH and other people here at the IETF, the chairs have created a new, simpli= fied version of the draft, which we have uploaded in the repo at:

 

This e-mail is to start a discussion on the ML abo= ut this revamped charter. Please send comments directly to this thread. Ide= ally, we would like to converge within a couple of days, so let's start the discussion right now.

 

Pascal & Thomas

--_000_674F70E5F2BE564CB06B6901FD3DD78B1883E337tgxml338toshiba_-- From rsudhaak@cisco.com Thu Aug 1 23:10:38 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DC2D221F972C for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 23:10:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ej1+YDX1ML2d for <6tsch@ietfa.amsl.com>; Thu, 1 Aug 2013 23:10:31 -0700 (PDT) Received: from rcdn-iport-7.cisco.com (rcdn-iport-7.cisco.com [173.37.86.78]) by ietfa.amsl.com (Postfix) with ESMTP id 1504021F9675 for <6tsch@ietf.org>; Thu, 1 Aug 2013 23:10:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=26909; q=dns/txt; s=iport; t=1375423831; x=1376633431; h=from:to:subject:date:message-id:in-reply-to:mime-version; bh=jscQy6ZmOeQzrfwSvImbxTx4MiTDT7hZgrzjFirlrz8=; b=ihYQHgF4MyJNi9mDGSfTribs9pnt7pJwexbevmRI0m99RtrVTTFsIbM8 43i7g6hKA2NsL3uhspISgj8pJwZFpOhzulGGbL7SahTfalg0Ltwscs3S2 Nqp5sHDlY6th32nTB8ALyTfdxP4KtDUt69YTrmJ5QSDR2TkuqfvGoX4Al c=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AigFAMdM+1GtJXG//2dsb2JhbABbDoI0RDVQvk2BGxZ0giQBAQEBAy1eAQgRAQIBAgsWBzkUAwYIAgQBEgiICAy5LQSOPxCBByANCgEGgxNzA4VEjkSVJYJZPoFxOQ X-IronPort-AV: E=Sophos;i="4.89,799,1367971200"; d="scan'208,217";a="242603538" Received: from rcdn-core2-4.cisco.com ([173.37.113.191]) by rcdn-iport-7.cisco.com with ESMTP; 02 Aug 2013 06:10:30 +0000 Received: from xhc-rcd-x14.cisco.com (xhc-rcd-x14.cisco.com [173.37.183.88]) by rcdn-core2-4.cisco.com (8.14.5/8.14.5) with ESMTP id r726AUxf006876 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 2 Aug 2013 06:10:30 GMT Received: from xmb-rcd-x04.cisco.com ([169.254.8.99]) by xhc-rcd-x14.cisco.com ([173.37.183.88]) with mapi id 14.02.0318.004; Fri, 2 Aug 2013 01:10:29 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: "dominique.barthel@orange.com" , "Thomas Watteyne" , 6TSCH <6tsch@ietf.org> Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOj0b8A0peJlBankqBszyBnwxOPQ== Date: Fri, 2 Aug 2013 06:10:29 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B18501B57@xmb-rcd-x04.cisco.com> In-Reply-To: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.21.69.214] Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B18501B57xmbrcdx04ciscoc_" MIME-Version: 1.0 Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 06:10:39 -0000 --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B18501B57xmbrcdx04ciscoc_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Thomas, Pascal, This looks very focussed now. I have a few things that we need to address - 1. The statement "Initially, the WG will define a framework to install a= static schedule and run the Routing Protocol for LLNs (RPL) over that sche= dule" in the description of the working group and work item 1 seem to be in= conflict. We say we will work on static schedules which means that L3 (RPL= ) can only query cell/link quality info from TSCH. Work item 1 explicitly s= tates - "to describe how an entity can manage the TSCH schedule on a 6TSCH = node". I feel it is better to remove this statement from the work item. 2. In this context, The current work item 1 could possibly be renamed to= , "Query methods and formats for timeslot/cell parameters"?? 3. Also, it may be better to flip the order of work items 1,2 (i.e) have= "minimal 6TSCH config" as first work item and "Query methods and formats f= or timeslot/cell parameters" as work item 1 to reflect the statements made = in the description of the working group. 4. I second the point about elaborating on "entity" in the current work = item 1 raised by Dominique and Qin. We could say, "route management entity"= ? We may also reword the second paragraph of Description of working group as = follows - Initially, the WG will define a framework to install a static schedule on a= 6TSCH network and run the Routing Protocol for LLNs (RPL) over that schedu= le. We will also define methods for RPL to query parameters and states from= the 6TSCH network. In the third paragraph of the description of WG, this statement - A dynamic schedule for traffic that is switched at the timeslot level may f= or example be computed centrally by an entity located on the backbone. can be reworded as - The TSCH schedule may be computed by a central entity located in the backbo= ne (or co-located with the 6TSCH network gateway), with out without informa= tion from the routing protocol. (Im not sure we need to get into more detai= l here, since this is just the description of the WG). IMO, this gives general flow like - 1) Get RPL working with TSCH using stan= dardized formats. 2) Allow L3 to influence TSCH schedule to fully extract b= enefits of L3 features and capabilities. -raghuram From: > Date: Thursday, August 1, 2013 7:01 PM To: Thomas Watteyne >, 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? Woww, now this is very focused. This should give us a clear framework to st= art our work, and hopefully expand later. Overall, I believe the current Work Items description could elaborate a bit= more. Specifically, please find below my questions, followed by other minor remar= ks/suggested changes. Dominique --------- Questions =AB Produce "Timeslot Management Methods and Formats" to describe how an en= tity can manage the TSCH schedule on a 6TSCH node=94. The schedule is somew= here described as being static. In this sentence, the schedule can be =93ma= naged=94 by an =93entity=94. What prevents the so-called entity to =93manag= e=94 the schedule, i.e. allocate slots, based on some information such as t= raffic requirements? In which case, what does =93static=94 mean? Probably = =93imposed upon the 6top layer=94 (if such notion still exists) by some ext= ernal mechanism. =93or learnt by a node when joining the network, possibly in a format as de= fined by work item 1.=94 Do you mean the description of the schedule would be provided =93in-band=94= to the joining node (through EB=92s or similar mechanism). This does not s= eem to fit the description of work item 1, where the =93entity=94 is an upp= er layer. Or do you mean as a payload transported on a default cell/link be= tween upper layer entities ? =933. Produce "6TSCH architecture" to describe the design and implementatio= n of 6TSCH networks. This document will highlight the different architectur= al blocks and signaling flows, including the operation of the network in th= e presence of multiple BBRs.=94 Does this include any form of multi-hop ND? In light of the discussion at 6= lo BoF on this topic, how will compare to 6lowpan-ND? Sentences unclear to me =93A dynamic schedule for traffic that is switched at the timeslot level ma= y for example be computed centrally by an entity located on the backbone.= =94 This sentence is complex and unclear to me overall. Consider rephrasin= g? =93Produce "Timeslot Management Methods and Formats" to describe how an ent= ity can manage the TSCH schedule on a 6TSCH node=94. Is it assumed that eve= rybody knows what =93entity=94 is supposed to mean in this context? Minor changes s/in front of interference/in front of narrow-band interference s/- implementers guide, collecting/- implementers guide: this document will= collect/ s/- coexistence guide, providing/- coexistence guide: this document will pr= ovide/ English writing s/and ISA100.11a, and/and ISA100.11a, while/ s/Initially the document/Initially, the document s/be adapted dynamically/be dynamically adapted/ De : 6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] De la part de Thomas Watteyne Envoy=E9 : jeudi 1 ao=FBt 2013 15:13 =C0 : 6TSCH; Ted Lemon (ted.lemon@nominum.com= ); Adrian Farrel (adrian@olddog.co.uk); Marc Bl= anchet Objet : [6tsch] updated charter per BoF suggestion: thoughts? All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B18501B57xmbrcdx04ciscoc_ Content-Type: text/html; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: quoted-printable
Thom= as, Pascal,
This= looks very focussed now. I have a few things that we need to address -
  1. The statement "Initially, the WG will define a framework to install a static sc= hedule and run th= e Routing Protocol for LLNs (RPL) over that schedule" in the descripti= on of the working group and work item 1 seem to be in conflict. We say we w= ill work on static schedules which means that L3 (RPL) can only query cell/link quality info from TSCH. Work item 1= explicitly states - "to describe how an entity can ma= nage the TSCH schedule on a 6TSCH node". I feel it is better to remove= this statement from the work item. 
  2. In this context, The current wor= k item 1 could possibly be renamed to , "= Query methods and formats for timeslot/cell parameters"??
    3. <= li>Also, it m= ay be better to flip the order of work items 1,2 (i.e) have "minimal 6= TSCH config" as first work item and "Query methods and forma= ts for timeslot/cell parameters" as work item 1 to reflect the statements made in the descript= ion of the working group.
  3. I second the point about elaborating on "entity" in the cu= rrent work item 1 raised by Dominique and Qin. We could say, "route management entity"?

We m= ay also reword the second paragraph of Description of working group as foll= ows -
Initially, the WG will define a framework to install a static schedu= le on a 6TSCH network and run the Routing Protocol for LLNs (RPL) over that schedule. We will also define methods fo= r RPL to query parameters and states from the 6TSCH network.

In the third paragra=
ph of the description of WG, this statement -
A dynamic schedule for traffic that is switched at the timeslot level =
may for example be computed centrally by an entity located on the backbone.=

can be reworded as -

The TSCH schedule ma=
y be computed by a central entity located in the backbone (or co-located wi=
th the 6TSCH network gateway), with out without information from the routin=
g protocol. (Im not sure=
 we need to get into more detail here, since this is just the description o=
f the WG).

IMO, this gives =
general flow like - 1) Get RPL working with TSCH using standardized formats=
. 2) Allow L3 to influence TSCH schedule to fully extract benefits of L3 fe=
atures and capabilities.
-raghuram
From: <dominique.barthel@orange.com>
Date: Thursday, August 1, 2013 7:01= PM
To: Thomas Watteyne <watteyne@eecs.berkeley.edu>, 6TSC= H <6tsch@ietf.org>
Subject: Re: [6tsch] updated charte= r per BoF suggestion: thoughts?

Woww, now this is v= ery focused. This should give us a clear framework to start our work, and h= opefully expand later.

Overall, I believe = the current Work Items description could elaborate a bit more.

Specifically, pleas= e find below my questions, followed by other minor remarks/suggested change= s.

 

Dominique

 

---------

 

Questions

=AB Produce &q= uot;Timeslot Management Methods and Formats" to describe how an entity= can manage the TSCH schedule on a 6TSCH node=94. The schedule is somewhere described as being static. In this sentence, the schedule can= be =93managed=94 by an =93entity=94. What prevents the so-called entity to= =93manage=94 the schedule, i.e. allocate slots, based on some information = such as traffic requirements? In which case, what does =93static=94 mean? Probably =93imposed upon the 6top layer=94 (i= f such notion still exists) by some external mechanism.

 

=93or learnt by a n= ode when joining the network, possibly in a format as defined by work item = 1.=94

Do you mean the des= cription of the schedule would be provided =93in-band=94 to the joining nod= e (through EB=92s or similar mechanism). This does not seem to fit the description of work item 1, where the =93entity= =94 is an upper layer. Or do you mean as a payload transported on a default= cell/link between upper layer entities ?

 

=933. Produce "= ;6TSCH architecture" to describe the design and implementation of 6TSC= H networks. This document will highlight the different architectural blocks and signaling flows, including the operation of the n= etwork in the presence of multiple BBRs.=94

Does this include a= ny form of multi-hop ND? In light of the discussion at 6lo BoF on this topi= c, how will compare to 6lowpan-ND?

 

Sentences unclear t= o me

=93A dynamic schedu= le for traffic that is switched at the timeslot level may for example be co= mputed centrally by an entity located on the backbone.=94  This sentence is complex and unclear to me overall.= Consider rephrasing?

=93Produce "Ti= meslot Management Methods and Formats" to describe how an entity can m= anage the TSCH schedule on a 6TSCH node=94. Is it assumed that everybody knows what =93entity=94 is supposed to mean in this context= ?

 

Minor changes

s/in front of inter= ference/in front of narrow-band interference

s/- implementers gu= ide, collecting/- implementers guide: this document will collect/

s/- coexistence gui= de, providing/- coexistence guide: this document will provide/

 

English writing<= /p>

s/and ISA100.11a, a= nd/and ISA100.11a, while/

s/Initially the doc= ument/Initially, the document

s/be adapted dynami= cally/be dynamically adapted/

 

 

 

 

De : 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
Envoy=E9 : jeudi 1 ao=FBt 2013 15:13
=C0 : 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.co.uk); Marc Blanchet
Objet : [6tsch] updated charter per BoF suggestion: thoughts?

 

All,

 

Thanks to all for for the effort of putting together= the BoF on Tuesday! One of the suggestions was to simplify the charter, in= particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSCH= and other people here at the IETF, the chairs have created a new, simplifi= ed version of the draft, which we have uploaded in the repo at:<= /p>

 

This e-mail is to start a discussion on the ML about= this revamped charter. Please send comments directly to this thread. Ideal= ly, we would like to converge within a couple of days, so let's start the d= iscussion right now.

 

Pascal & Thomas

______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
--_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B18501B57xmbrcdx04ciscoc_-- From googen@gmail.com Fri Aug 2 00:57:34 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6851111E8286 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 00:57:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7OFKFy5Zz1fl for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 00:57:31 -0700 (PDT) Received: from mail-oa0-x231.google.com (mail-oa0-x231.google.com [IPv6:2607:f8b0:4003:c02::231]) by ietfa.amsl.com (Postfix) with ESMTP id 5D57711E827F for <6tsch@ietf.org>; Fri, 2 Aug 2013 00:57:31 -0700 (PDT) Received: by mail-oa0-f49.google.com with SMTP id n10so718083oag.22 for <6tsch@ietf.org>; Fri, 02 Aug 2013 00:57:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=SQ3t3+Y9W5io7yIViU+fUpYr9mxX5REVX/WV4aJxnN4=; b=uWKq+g4Y+6R4df4gvyKj60oclDbd3wyLlb2ZNsdW8b8X5//jDhduFadCFkUjoXIBzM 76ui7scj9OGqj2I3ME3X5MgU4KfHRT4R4YJnoNYbvt8k90AV4didS36+SSqUcLztb8Fw E7ONwXw+B9IZadVffavW6s2iB2AzuU5jyDHiZbf6Z16PXsEASXMr7kZcneLAGRJLUMhk Ha46Ztbu4lBEANR6ENiIuemd67OLbsh3mK9BxicqKUHiqdplF9UjtF7CWcF1j9fPyThQ B11+KWJWk3dVgITS8O/7NcaTlpz1CMgBSarOV9EszpeXn0zNV6OQfvtAhdP7Dp6D68Ob KknA== MIME-Version: 1.0 X-Received: by 10.60.161.108 with SMTP id xr12mr4332191oeb.32.1375430250794; Fri, 02 Aug 2013 00:57:30 -0700 (PDT) Sender: googen@gmail.com Received: by 10.60.3.5 with HTTP; Fri, 2 Aug 2013 00:57:30 -0700 (PDT) In-Reply-To: References: Date: Fri, 2 Aug 2013 09:57:30 +0200 X-Google-Sender-Auth: 89IlHxkMLKwP-i7V6rPUmVNLPp8 Message-ID: From: Gennaro Boggia To: 6tsch@ietf.org Content-Type: multipart/alternative; boundary=089e011771978316de04e2f24f83 X-Mailman-Approved-At: Fri, 02 Aug 2013 02:00:48 -0700 Cc: Thomas Watteyne Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 07:57:35 -0000 --089e011771978316de04e2f24f83 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Great!! I think that now all is more clear and better explained. Thank you very much for this work Gennaro Il giorno venerd=EC 2 agosto 2013, Xavier Vilajosana Guillen ha scritto: > Great work. Nothing else to add! my vote on it! > X > > > On Thu, Aug 1, 2013 at 11:11 PM, Prof. Diego Dujovne < > diego.dujovne@mail.udp.cl 'diego.dujovne@mail.udp.cl');>> wrote: > >> I accept the charter as it is stated on charter-ietf-6tsch-00.txt >> >> Diego Dujovne >> >> 2013/8/1 Thomas Watteyne > 'cvml', 'watteyne@eecs.berkeley.edu');>>: >> > All, >> > >> > Thanks to all for for the effort of putting together the BoF on >> Tuesday! One >> > of the suggestions was to simplify the charter, in particular by >> reducing >> > the number of work items. >> > >> > After discussion and suggestions from numerous 6TSCH and other people >> here >> > at the IETF, the chairs have created a new, simplified version of the >> draft, >> > which we have uploaded in the repo at: >> > >> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6= tsch-00.txt >> > >> > This e-mail is to start a discussion on the ML about this revamped >> charter. >> > Please send comments directly to this thread. Ideally, we would like t= o >> > converge within a couple of days, so let's start the discussion right >> now. >> > >> > Pascal & Thomas >> > >> > _______________________________________________ >> > 6tsch mailing list >> > 6tsch@ietf.org >> > https://www.ietf.org/mailman/listinfo/6tsch >> > >> >> >> >> -- >> DIEGO DUJOVNE >> Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicacione= s >> Facultad de Ingenier=EDa UDP >> www.ingenieria.udp.cl >> (56 2) 676 8125 >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> > > --089e011771978316de04e2f24f83 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Great!!

I think that now all is more clear and better ex= plained.

Thank you very much for this work

Gennaro

Il giorno venerd=EC 2 agosto = 2013, Xavier Vilajosana Guillen ha scritto:
Great work. Nothing else to= add! my vote on it!
X


On Thu, Aug 1, 2013 at 11:11 PM, Prof. Diego Dujovne <= diego.dujovne@mail.udp.cl> wrote:<= br>
I accept the charter as it is stated on char= ter-ietf-6tsch-00.txt

Diego Dujovne

2013/8/1 Thomas Watteyne <watteyne@eecs.berk= eley.edu>:
> All,
>
> Thanks to all for for the effort of putting together the BoF on Tuesda= y! One
> of the suggestions was to simplify the charter, in particular by reduc= ing
> the number of work items.
>
> After discussion and suggestions from numerous 6TSCH and other people = here
> at the IETF, the chairs have created a new, simplified version of the = draft,
> which we have uploaded in the repo at:
> https://bitbucket.org/6tsch/cha= rter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt
>
> This e-mail is to start a discussion on the ML about this revamped cha= rter.
> Please send comments directly to this thread. Ideally, we would like t= o
> converge within a couple of days, so let's start the discussion ri= ght now.
>
> Pascal & Thomas
>
> _______________________________________________
> 6tsch mailing list
> 6tsch@ietf.org
> https://www.ietf.org/mailman/listinfo/6tsch
>



--
DIEGO DUJOVNE
Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
www.ingenieria.u= dp.cl
(56 2) 676 8125
_______________________________________________
6tsch mailing list
6tsch@ietf.org
h= ttps://www.ietf.org/mailman/listinfo/6tsch

--089e011771978316de04e2f24f83-- From pthubert@cisco.com Fri Aug 2 02:03:09 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7EE6011E831B for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 02:03:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.533 X-Spam-Level: X-Spam-Status: No, score=-10.533 tagged_above=-999 required=5 tests=[AWL=0.065, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tk60kBzX8zXt for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 02:02:57 -0700 (PDT) Received: from rcdn-iport-7.cisco.com (rcdn-iport-7.cisco.com [173.37.86.78]) by ietfa.amsl.com (Postfix) with ESMTP id 1B8D311E82E1 for <6tsch@ietf.org>; Fri, 2 Aug 2013 01:57:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=14379; q=dns/txt; s=iport; t=1375433831; x=1376643431; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=0cC5GgQe2E/J3MKO/jy1wiRdegphBrhV7jomUKeEtCA=; b=YhDlFAEnor7UA87mw+oSGpusCGLpOiJTRx5DJEi8RNjajJ9PNwHSvScb MiP54LJYN5/qIK0NRyrY0q4RQGYzGvhJLIVNNvhjZjgUj1SSV6ayTvYXw zNKLsiQSCEIIqJZnRcfDMxM6u0wQ9Vrm0mV2yFbD7didKnfrZ5/yVIP1a k=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AikFAHZz+1GtJXG8/2dsb2JhbABbDoI0RDVQvk2BGxZ0giQBAQEBAwEBASpBCxACAQgRBAEBCwsSBycLFAkIAgQBDQUIiAgMuHgEjk+BBy0EBgEKgw9zA4VEgy6gO4JZPoFxOQ X-IronPort-AV: E=Sophos;i="4.89,800,1367971200"; d="scan'208,217";a="242648565" Received: from rcdn-core2-1.cisco.com ([173.37.113.188]) by rcdn-iport-7.cisco.com with ESMTP; 02 Aug 2013 08:56:36 +0000 Received: from xhc-rcd-x03.cisco.com (xhc-rcd-x03.cisco.com [173.37.183.77]) by rcdn-core2-1.cisco.com (8.14.5/8.14.5) with ESMTP id r728uZq9031572 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 2 Aug 2013 08:56:35 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.104]) by xhc-rcd-x03.cisco.com ([173.37.183.77]) with mapi id 14.02.0318.004; Fri, 2 Aug 2013 03:56:35 -0500 From: "Pascal Thubert (pthubert)" To: Rafa Marin Lopez , Thomas Watteyne Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOjvuhA0peJlBankqBszyBnwxOPZmBi4Lg Date: Fri, 2 Aug 2013 08:56:34 +0000 Deferred-Delivery: Fri, 2 Aug 2013 08:56:00 +0000 Message-ID: References: <523EF154-B9B3-4FE1-9E1F-891F3288524B@um.es> In-Reply-To: <523EF154-B9B3-4FE1-9E1F-891F3288524B@um.es> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.196.95] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD8413C91FDxmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 09:03:09 -0000 --_000_E045AECD98228444A58C61C200AE1BD8413C91FDxmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Certainly Rafa; It is fine that some documents stay personal submissions for a while. We know we need to continue the work that has started on security and expan= d it. And hopefully we'll progress the initial items efficiently and re-charter s= oon to take more of the required work on board. On security: we probably want to separate the analysis of the particular is= sues with in one hand: - issues with this MAC, - the potential scale of a 6TSCH network, - the various deployment types (need for profiles?), And in the other: - applicability statements such as PANA - return from experience (ISA100.11a, Wireless HART) The quality and coverage of the work will be a good incentive to make sure = that it can progress in a proper way. Cheers, Pascal From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of R= afa Marin Lopez Sent: jeudi 1 ao=FBt 2013 23:11 To: Thomas Watteyne Cc: Adrian Farrel (adrian@olddog.co.uk); 6TSCH; Ted Lemon (ted.lemon@nominu= m.com); Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? Dear Chairs: Thanks for this new charter. Evidently, it is more condensed and simplified= , which is good, taking into account the comments received during the BOF. I have also noticed that security part has been completely removed. Althoug= h my interest was specially based on that part, I understand that these asp= ects could be covered in the future, when the current work for this charter= is finished. Best Regards. El 01/08/2013, a las 15:12, Thomas Watteyne escribi=F3: All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch ------------------------------------------------------- Rafael Marin Lopez, PhD Dept. Information and Communications Engineering (DIIC) Faculty of Computer Science-University of Murcia 30100 Murcia - Spain Telf: +34868888501 Fax: +34868884151 e-mail: rafa@um.es ------------------------------------------------------- --_000_E045AECD98228444A58C61C200AE1BD8413C91FDxmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Certainly Rafa;

 <= /p>

It is fine that some docu= ments stay personal submissions for a while.

We know we need to contin= ue the work that has started on security and expand it.

And hopefully we’ll= progress the initial items efficiently and re-charter soon to take more of= the required work on board.

 <= /p>

On security: we probably = want to separate the analysis of the particular issues with in one hand:

- issues with this MAC,

- the potential scale of = a 6TSCH network,

- the various deployment = types (need for profiles?),

 <= /p>

And in the other:

- applicability statement= s such as PANA

- return from experience = (ISA100.11a, Wireless HART)

 <= /p>

The quality and coverage = of the work will be a good incentive to make sure that it can progress in a= proper way.

 <= /p>

Cheers,=

 <= /p>

Pascal

 <= /p>

From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Rafa Marin Lopez
Sent: jeudi 1 ao=FBt 2013 23:11
To: Thomas Watteyne
Cc: Adrian Farrel (adrian@olddog.co.uk); 6TSCH; Ted Lemon (ted.lemon= @nominum.com); Marc Blanchet
Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts?

 

Dear Chairs:

 

Thanks for this new charter. Evidently, it is more c= ondensed and simplified, which is good, taking into account the comments re= ceived during the BOF. 

 

I have also noticed that security part has been comp= letely removed. Although my interest was specially based on that part, I un= derstand that these aspects could be covered in the future, when the curren= t work for this charter is finished.

 

Best Regards. 

El 01/08/2013, a las 15:12, Thomas Watteyne escribi= =F3:



All,

 

Thanks to all for for the effort of putting together= the BoF on Tuesday! One of the suggestions was to simplify the charter, in= particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSCH= and other people here at the IETF, the chairs have created a new, simplifi= ed version of the draft, which we have uploaded in the repo at:<= /p>

 

This e-mail is to start a discussion on the ML about= this revamped charter. Please send comments directly to this thread. Ideal= ly, we would like to converge within a couple of days, so let's start the d= iscussion right now.

 

Pascal & Thomas

_______________________________________________
6tsch mailing list
6tsch@ietf.org
https://www.ietf.or= g/mailman/listinfo/6tsch

 

-------------------------------------------------------

Rafael Marin Lopez, PhD

Dept. Information and Communications Engineering (DIIC)

Faculty of Computer Science-University of Murcia

30100 Murcia - Spain

Telf: +34868888501 Fax: +34868884151 e-mail: rafa@um.es

-------------------------------------------------------

 

 

 

 

--_000_E045AECD98228444A58C61C200AE1BD8413C91FDxmbrcdx01ciscoc_-- From pthubert@cisco.com Fri Aug 2 04:09:20 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1653511E810B for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:09:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.538 X-Spam-Level: X-Spam-Status: No, score=-10.538 tagged_above=-999 required=5 tests=[AWL=0.060, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HXpFqq01rcxe for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:09:15 -0700 (PDT) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id 5CB1911E8311 for <6tsch@ietf.org>; Fri, 2 Aug 2013 04:06:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=19660; q=dns/txt; s=iport; t=1375441584; x=1376651184; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=hEPtN4rHPx7iOf8zgKcvvaiX6vNEfv2xe6F2tVAFUlg=; b=fpaVXYVk05zEhZ+Of3K4sdMjOwQbLTseiuA9Rmbxnljd4vkaEW0QNqGB shLwI/XySfMnIU+SzgjMrLwNAT2dTdjCTXI2tU8Aya8GkJfwtStiHgTPv I4X6vcqez1V4RlRYHiz7pdn5R3Ioq1tIWtGmH07LOAhU3ShIe0j09XI2F 0=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Aj8FACuS+1GtJXG8/2dsb2JhbABaDoI0RDVQthqIOIEcFnSCJAEBAQQBAQEqQQsQAgEIEQEDAQELHQcnCxQDBggCBAENBQgTh3UMuQOOYIEHLQQGAYMZdAOFRIMukBeQJIJZPoFxOQ X-IronPort-AV: E=Sophos;i="4.89,800,1367971200"; d="scan'208,217";a="242503495" Received: from rcdn-core2-1.cisco.com ([173.37.113.188]) by rcdn-iport-1.cisco.com with ESMTP; 02 Aug 2013 11:06:23 +0000 Received: from xhc-rcd-x12.cisco.com (xhc-rcd-x12.cisco.com [173.37.183.86]) by rcdn-core2-1.cisco.com (8.14.5/8.14.5) with ESMTP id r72B6Nov021607 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 2 Aug 2013 11:06:23 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.104]) by xhc-rcd-x12.cisco.com ([173.37.183.86]) with mapi id 14.02.0318.004; Fri, 2 Aug 2013 06:06:23 -0500 From: "Pascal Thubert (pthubert)" To: Qin Wang , Thomas Watteyne Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOjvubA0peJlBankqBszyBnwxOPZmBs74w Date: Fri, 2 Aug 2013 11:06:22 +0000 Deferred-Delivery: Fri, 2 Aug 2013 11:05:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.170.72] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD8413C9849xmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 11:09:20 -0000 --_000_E045AECD98228444A58C61C200AE1BD8413C9849xmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Qin: Thanks for the comments! With this version of the charter, 6top is a thin layer that enabl= es the operation in the basic operation as described in Xavi's draft and that's it. The bare minimum for 6top is a schedule that provides base links for RPL op= erations. Within charter, each node boots with a default schedule, may get an update = at join time and from then on it lives with it. This is what we call static= . The more complex pieces of 6top which required standardization: - dynamic negotiation between peers to allocate timeslots for routed traffi= c (your dynamic) - track allocation for switched traffic (your static?) - track switching operation (G-MPLS) are delayed till be have standardized the basic mechanisms to manage the sc= hedule in the first place. So we do not consider either distributed or centralized schedule recomputat= ion. The focus is on which primitives are needed from / to the device to manage = a schedule regardless of which entity is doing the management. The draft charter is voluntarily agnostic of what that abstract entity is b= ecause the control primitives should be open enough regardless of: - the type of peer entity (a CNM engine, a PCE, an SDN controller...) - the transport to which the primitive is bound If the basic operation document becomes the solution for our item1, it will= probably propose a simple method (e.g. CoAP based) to inject a schedule in= every node so we can test interop. The complexity in the scheduling may no= t require standardization but may still be discussed in the first architect= ure draft. This is probably enough work for a first round, wouldn't you think? Pascal From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Q= in Wang Sent: jeudi 1 ao=FBt 2013 23:11 To: Thomas Watteyne Cc: Adrian Farrel (adrian@olddog.co.uk); 6TSCH; Ted Lemon (ted.lemon@nominu= m.com); Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? Hi Thomas, Pascal and All, Regarding to the scope, i.e. "Description of Working Group", I would like t= o clarify my understanding on "static schedule", and "dynamic schedule" fir= stly. Actually, there are two parameters related to establishing and maintaining = a TSCH schedule, one is about "who", which values are (centralized, decentr= alized); another one is about change over time, which values are (static, d= ynamic). In the current version of 6top, the two parameters are associated = with each other (but not have to), i.e. "centralized" is associated with "s= tatic", because it is assumed that centralized can optimize resource and av= oid collision; and "decentralized" is associated with "dynamic", because it= is assumed collision can not avoided completely by local negotiation. The Charter says "Initially, the WG will define a framework to install a s= tatic schedule and run the Routing Protocol for LLNs (RPL) over that schedule. If successful, = the intent is to recharter to allow for dynamic schedules......". It means: step-1: we define methods and messages for establishing TSCH schedule in th= e way of (centralized, static); step-2: we define methods and messages for establishing TSCH schedule in t= he way of (centralized, dynamic) and (decentralized, dynamic) ; Correct? Based one above, how do you think the combination (decentralized, dynamic)?= For example, allow establishing schedule locally, but do not allow change,= or in another word, change must be instructed by upper layer, instead of b= y the sublayer. Thanks Qin On Thu, Aug 1, 2013 at 9:12 PM, Thomas Watteyne > wrote: All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD8413C9849xmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello Qin:

 <= /p>

Thanks for the comments!<= o:p>

 <= /p>

With this version of the charter, 6top is a thin layer that enables the operation in the basic operation as = described in = Xavi’s draft and t= hat’s it.

The bare minimum for 6top= is a schedule that provides base links for RPL operations.

Within charter, each node= boots with a default schedule, may get an update at join time and from the= n on it lives with it. This is what we call static.

 <= /p>

The more complex pieces o= f 6top which required standardization:

- dynamic negotiation bet= ween peers to allocate timeslots for routed traffic (your dynamic)

- track allocation for sw= itched traffic (your static?)

- track switching operati= on (G-MPLS)

are delayed till be have = standardized the basic mechanisms to manage the schedule in the first place= .

So we do not consider eit= her distributed or centralized schedule recomputation.

 <= /p>

The focus is on which pri= mitives are needed from / to the device to manage a schedule regardless of = which entity is doing the management.

The draft charter is volu= ntarily agnostic of what that abstract entity is because the control primit= ives should be open enough regardless of:

- the type of peer entity= (a CNM engine, a PCE, an SDN controller...)

- the transport to which = the primitive is bound

 <= /p>

If the basic operation do= cument becomes the solution for our item1, it will probably propose a simpl= e method (e.g. CoAP based) to inject a schedule in every node so we can test interop. The complexity in the scheduling may not requ= ire standardization but may still be discussed in the first architecture dr= aft.

 <= /p>

This is probably enough w= ork for a first round, wouldn’t you think?

 <= /p>

Pascal<= /p>

 <= /p>

From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
Sent: jeudi 1 ao=FBt 2013 23:11
To: Thomas Watteyne
Cc: Adrian Farrel (adrian@olddog.co.uk); 6TSCH; Ted Lemon (ted.lemon= @nominum.com); Marc Blanchet
Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts?

 

Hi Thomas, Pascal and All,

 

Regarding to the scope, i.e. "Descriptio= n of Working Group", I would like to clarify my understanding o= n "static schedule", and "dynamic schedule" firstly.&nb= sp;

 

Actually, there are two parameters related to establ= ishing and maintaining a TSCH schedule, one is about "who", which= values are (centralized, decentralized); another one is about change over = time, which values are (static, dynamic). In the current version of 6top, the two parameters are associated with each o= ther (but not have to), i.e. "centralized" is associated with &qu= ot;static", because it is assumed that centralized can optimize resour= ce and avoid collision; and "decentralized" is associated with "dynamic", because it is assumed collision can not avoided = completely by local negotiation.

 

The Charter says  "Initially, the W= G will define a framework to install a static schedule and 

run the Routing Protoco= l for LLNs (RPL) over that schedule. If successful, the intent is to r= echarter to allow for dynamic schedules......".  

It means: 

step-1: we define methods and messages for establish= ing TSCH schedule in the way of (centralized, static); 

step-2: we define  methods and messages for est= ablishing TSCH schedule in the way of (centralized, dynamic) and  (dec= entralized, dynamic) ; 

 

Correct?

 

Based one above, how do you think the combination (d= ecentralized, dynamic)? For example, allow establishing schedule locally, b= ut do not allow change, or in another word, change must be instructed by up= per layer, instead of by the sublayer.

 

Thanks

Qin

 

 

 

 

 

On Thu, Aug 1, 2013 at 9:12 PM, Thomas Watteyne <= watteyne@ee= cs.berkeley.edu> wrote:

All,

 

Thanks to all for for the effort of putting together= the BoF on Tuesday! One of the suggestions was to simplify the charter, in= particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSCH= and other people here at the IETF, the chairs have created a new, simplifi= ed version of the draft, which we have uploaded in the repo at:<= /p>

 

This e-mail is to start a discussion on the ML about= this revamped charter. Please send comments directly to this thread. Ideal= ly, we would like to converge within a couple of days, so let's start the d= iscussion right now.

 

Pascal & Thomas


_______________________________________________
6tsch mailing list
6tsch@ietf.org
h= ttps://www.ietf.org/mailman/listinfo/6tsch

 

--_000_E045AECD98228444A58C61C200AE1BD8413C9849xmbrcdx01ciscoc_-- From googen@gmail.com Fri Aug 2 04:10:41 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F2A411E82CA for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:10:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TFbAe4VV0+p6 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:10:40 -0700 (PDT) Received: from mail-oa0-x236.google.com (mail-oa0-x236.google.com [IPv6:2607:f8b0:4003:c02::236]) by ietfa.amsl.com (Postfix) with ESMTP id 4F37711E82E8 for <6tsch@ietf.org>; Fri, 2 Aug 2013 04:08:57 -0700 (PDT) Received: by mail-oa0-f54.google.com with SMTP id o6so1056912oag.13 for <6tsch@ietf.org>; Fri, 02 Aug 2013 04:08:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=MozdwxBsHnkuQDeEnD7VJOZuMWuUpY8Y5Z9VElEiKpg=; b=nYuWZPuEstnJAdZhcyBoX0UNHtI90vGjz62yxRNG1k+cMGLqNtBzFZvec1twjICB89 emWZuc/cEXAhD0IaP+v5GC3jP/mYeecbcCqbflrfnE4RhoFo3arq6pzOj3SkmOqLyyLM MJLRB9OtS6t4yuv+fPttmNqLA8Ohs7w9vottwt14avewGpv3aHfphbebct8rRzTvtAAu +NkE0QmaQ/l4vzj8nrbAfVIlghQnvBoTDC1BbwZtkpW+fLf6AowdrKGUCb4B1DNN/TRZ v7WFwpog7roH4V/DohuFiY4x+nlU2zPDPVydU97X58dg5B0h4GVjVrW1+H7aJEYK1tDZ xsng== MIME-Version: 1.0 X-Received: by 10.60.15.106 with SMTP id w10mr4847746oec.82.1375441736804; Fri, 02 Aug 2013 04:08:56 -0700 (PDT) Sender: googen@gmail.com Received: by 10.60.3.5 with HTTP; Fri, 2 Aug 2013 04:08:56 -0700 (PDT) In-Reply-To: References: Date: Fri, 2 Aug 2013 13:08:56 +0200 X-Google-Sender-Auth: -8h-VudPJidhodORfvwoaHmIeQU Message-ID: From: Gennaro Boggia To: 6tsch@ietf.org Content-Type: multipart/alternative; boundary=089e0122838421b38a04e2f4fcc8 Cc: Thomas Watteyne Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 11:10:41 -0000 --089e0122838421b38a04e2f4fcc8 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Great!!! I think that now all is more clear and better explained. Thank you very much for this work Cheers Gennaro Il giorno venerd=EC 2 agosto 2013, Xavier Vilajosana Guillen ha scritto: > Great work. Nothing else to add! my vote on it! > X > > > On Thu, Aug 1, 2013 at 11:11 PM, Prof. Diego Dujovne < > diego.dujovne@mail.udp.cl 'diego.dujovne@mail.udp.cl');>> wrote: > >> I accept the charter as it is stated on charter-ietf-6tsch-00.txt >> >> Diego Dujovne >> >> 2013/8/1 Thomas Watteyne > 'cvml', 'watteyne@eecs.berkeley.edu');>>: >> > All, >> > >> > Thanks to all for for the effort of putting together the BoF on >> Tuesday! One >> > of the suggestions was to simplify the charter, in particular by >> reducing >> > the number of work items. >> > >> > After discussion and suggestions from numerous 6TSCH and other people >> here >> > at the IETF, the chairs have created a new, simplified version of the >> draft, >> > which we have uploaded in the repo at: >> > >> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6= tsch-00.txt >> > >> > This e-mail is to start a discussion on the ML about this revamped >> charter. >> > Please send comments directly to this thread. Ideally, we would like t= o >> > converge within a couple of days, so let's start the discussion right >> now. >> > >> > Pascal & Thomas >> > >> > _______________________________________________ >> > 6tsch mailing list >> > 6tsch@ietf.org >> > https://www.ietf.org/mailman/listinfo/6tsch >> > >> >> >> >> -- >> DIEGO DUJOVNE >> Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicacione= s >> Facultad de Ingenier=EDa UDP >> www.ingenieria.udp.cl >> (56 2) 676 8125 >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> > > --089e0122838421b38a04e2f4fcc8 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Great!!!

I think that now all is more clear and = better explained.

Thank you very much for this work=

Cheers

Gennaro



Il giorno venerd=EC 2 agosto 2013, Xavier Vilajosana Guillen = ha scritto:
Great work.= Nothing else to add! my vote on it!
X


On= Thu, Aug 1, 2013 at 11:11 PM, Prof. Diego Dujovne <diego.dujovne@mail.udp.cl> wrote:
I accept the charter as it is stated on char= ter-ietf-6tsch-00.txt

Diego Dujovne

2013/8/1 Thomas Watteyne <watteyne@eecs.berk= eley.edu>:
> All,
>
> Thanks to all for for the effort of putting together the BoF on Tuesda= y! One
> of the suggestions was to simplify the charter, in particular by reduc= ing
> the number of work items.
>
> After discussion and suggestions from numerous 6TSCH and other people = here
> at the IETF, the chairs have created a new, simplified version of the = draft,
> which we have uploaded in the repo at:
> https://bitbucket.org/6tsch/cha= rter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt
>
> This e-mail is to start a discussion on the ML about this revamped cha= rter.
> Please send comments directly to this thread. Ideally, we would like t= o
> converge within a couple of days, so let's start the discussion ri= ght now.
>
> Pascal & Thomas
>
> _______________________________________________
> 6tsch mailing list
> 6tsch@ietf.org
> https://www.ietf.org/mailman/listinfo/6tsch
>



--
DIEGO DUJOVNE
Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
www.ingenieria.u= dp.cl
(56 2) 676 8125
_______________________________________________
6tsch mailing list
6tsch@ietf.org
h= ttps://www.ietf.org/mailman/listinfo/6tsch

--089e0122838421b38a04e2f4fcc8-- From pthubert@cisco.com Fri Aug 2 04:31:23 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4F92E21F9E96 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:31:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.542 X-Spam-Level: X-Spam-Status: No, score=-10.542 tagged_above=-999 required=5 tests=[AWL=0.056, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id p6To+IAb51wL for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:31:17 -0700 (PDT) Received: from rcdn-iport-5.cisco.com (rcdn-iport-5.cisco.com [173.37.86.76]) by ietfa.amsl.com (Postfix) with ESMTP id 8250C21E8315 for <6tsch@ietf.org>; Fri, 2 Aug 2013 04:30:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=40823; q=dns/txt; s=iport; t=1375443045; x=1376652645; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=uPUYhcamMzlpmp3SJaRTIKdHtG1XA0B3MGUnbxgq1Po=; b=SKKm8KhrqfJYwQpyecaXNHwzlUXRVM8vIgRQHFT8NsIGNdPaiGfJUdxH F4dyMWq4h06HSJ0n2zrGB2oH6SimepBn0lRiPKdlnBPcrxtbQi3Xq3Qz1 iVP5B8oBGdCbydnMZHjPuqREfX29UbOD0/7PF+fvLGpuzPI1Z33jI20z8 A=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Aj4FAFeX+1GtJV2c/2dsb2JhbABaDoI0RDVQvlKBHBZ0giQBAQEELVwCAQgRAQIBAQELFgEGBzIUAwYIAgQBEgiICAy5DQSOUBCBByANCgEGgxN0A4VEgy6LFpUlglk+gXE5 X-IronPort-AV: E=Sophos;i="4.89,800,1367971200"; d="scan'208,217";a="242702427" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by rcdn-iport-5.cisco.com with ESMTP; 02 Aug 2013 11:30:43 +0000 Received: from xhc-rcd-x15.cisco.com (xhc-rcd-x15.cisco.com [173.37.183.89]) by rcdn-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id r72BUhop030351 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 2 Aug 2013 11:30:43 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.104]) by xhc-rcd-x15.cisco.com ([173.37.183.89]) with mapi id 14.02.0318.004; Fri, 2 Aug 2013 06:30:42 -0500 From: "Pascal Thubert (pthubert)" To: "Raghuram Sudhaakar (rsudhaak)" , "dominique.barthel@orange.com" , "Thomas Watteyne" , 6TSCH <6tsch@ietf.org>, "Benoit Claise (bclaise)" Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOjsPDA0peJlBankqBszyBnwxOPZmAivGAgAE5UoD///60kA== Date: Fri, 2 Aug 2013 11:30:41 +0000 Deferred-Delivery: Fri, 2 Aug 2013 11:30:00 +0000 Message-ID: References: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> <2C3A8CAFDCAFCA41B8BF705CD9471C5B18501B57@xmb-rcd-x04.cisco.com> In-Reply-To: <2C3A8CAFDCAFCA41B8BF705CD9471C5B18501B57@xmb-rcd-x04.cisco.com> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.170.72] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD8413C992Cxmbrcdx01ciscoc_" MIME-Version: 1.0 Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 11:31:23 -0000 --_000_E045AECD98228444A58C61C200AE1BD8413C992Cxmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Pascal From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of R= aghuram Sudhaakar (rsudhaak) Sent: vendredi 2 ao=FBt 2013 08:10 To: dominique.barthel@orange.com; Thomas Watteyne; 6TSCH Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? Hello Raghu Thomas, Pascal, This looks very focussed now. I have a few things that we need to address - 1. The statement "Initially, the WG will define a framework to install a= static schedule and 2. run the Routing Protocol for LLNs (RPL) over that schedule" in the de= scription of the working group and work item 1 seem to be in conflict. We s= ay we will work on static schedules which means 3. that L3 (RPL) can only query cell/link quality info from TSCH. Work i= tem 1 explicitly states - "to describe how an entity 4. can manage the TSCH schedule on a 6TSCH node". I feel it is better to= remove this statement from the work item. 5. In this context, The current work item 1 could possibly be renamed to= , 6. "Query methods and formats for timeslot/cell parameters"?? 7. Also, it may be better to flip the order of work items 1,2 (i.e) have= "minimal 6TSCH config" as first work item and 8. "Query methods and formats for timeslot/cell parameters" 9. as work item 1 to reflect the statements made in the description of t= he working group. 10. 11. I second the point about elaborating on "entity" in the current work = item 1 raised by Dominique and Qin. We could say, "route management entity"= ? [] Hum. I talked to Benoit, and we concluded that we should consider networ= k management from day 1, just like we consider security from day 1. Day 1 for the schedule control primitives being now, we need to allow for m= ore general entities than just routing. So we are including the capability to report timeslot statistics, which may= or may or may not be used for centralized routing computation in next iter= ation of the charter, but will be required for network management activitie= s anyway. We may also reword the second paragraph of Description of working group as = follows - Initially, the WG will define a framework to install a static schedule on a= 6TSCH network and run the Routing Protocol for LLNs (RPL) over that schedule. We will also define methods for= RPL to query parameters and states from the 6TSCH network. [] You are proposing to add the last sentence above. Tis is actually openin= g a Pandora bow that I'd rather leave close for the time being. RPL may obt= ain link layer stats and there is nothing new there; but we are voluntarily= hiding the TSCH aspect at the 6top layer. We are shooting for simple in th= e first iteration. To be honest, I'm not sure that in the future, RPL shoul= d influence the schedule other than indirectly, that is by causing more or = less traffic to be routed via particular next hops, thus influencing 6top t= o modify the size of a bundle. Whether I'm right or wrong there, we are del= aying this item thus leaving the necessary time for this discussion. In the third paragraph of the description of WG, this statement - A dynamic schedule for traffic that is switched at the timeslot level may f= or example be computed centrally by an entity located on the backbone. can be reworded as - The TSCH schedule may be computed by a central entity located in the backbo= ne (or co-located with the 6TSCH network gateway), with out without informa= tion from the routing protocol. (Im not sure we need to get into more detai= l here, since this is just the description of the WG). [] this is a secondary piece that opens for the next iterations. What we wa= nt to indicate is that the track operation is in future scope, kind of lock= ing this work to this WG even if it is not in scope now. We voluntarily use= the terms "routed" and "switched" for the reasons I evoked in my answer to= Qin. Switched =3D=3D track, whether installed by PCE or RSVP type of opera= tion, and comes prior to the traffic. Routed operation starts with an initi= al schedule as covered by this charter, but in the next iteration, the 6top= layer in this node will need to interact with its peers in the neighbors t= o dynamically adapt the bundles to the traffic. Does this make sense? Cheers, Pascal From: > Date: Thursday, August 1, 2013 7:01 PM To: Thomas Watteyne >, 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? Woww, now this is very focused. This should give us a clear framework to st= art our work, and hopefully expand later. Overall, I believe the current Work Items description could elaborate a bit= more. Specifically, please find below my questions, followed by other minor remar= ks/suggested changes. Dominique --------- Questions =AB Produce "Timeslot Management Methods and Formats" to describe how an en= tity can manage the TSCH schedule on a 6TSCH node". The schedule is somewhe= re described as being static. In this sentence, the schedule can be "manage= d" by an "entity". What prevents the so-called entity to "manage" the sched= ule, i.e. allocate slots, based on some information such as traffic require= ments? In which case, what does "static" mean? Probably "imposed upon the 6= top layer" (if such notion still exists) by some external mechanism. "or learnt by a node when joining the network, possibly in a format as defi= ned by work item 1." Do you mean the description of the schedule would be provided "in-band" to = the joining node (through EB's or similar mechanism). This does not seem to= fit the description of work item 1, where the "entity" is an upper layer. = Or do you mean as a payload transported on a default cell/link between uppe= r layer entities ? "3. Produce "6TSCH architecture" to describe the design and implementation = of 6TSCH networks. This document will highlight the different architectural= blocks and signaling flows, including the operation of the network in the = presence of multiple BBRs." Does this include any form of multi-hop ND? In light of the discussion at 6= lo BoF on this topic, how will compare to 6lowpan-ND? Sentences unclear to me "A dynamic schedule for traffic that is switched at the timeslot level may = for example be computed centrally by an entity located on the backbone." T= his sentence is complex and unclear to me overall. Consider rephrasing? "Produce "Timeslot Management Methods and Formats" to describe how an entit= y can manage the TSCH schedule on a 6TSCH node". Is it assumed that everybo= dy knows what "entity" is supposed to mean in this context? Minor changes s/in front of interference/in front of narrow-band interference s/- implementers guide, collecting/- implementers guide: this document will= collect/ s/- coexistence guide, providing/- coexistence guide: this document will pr= ovide/ English writing s/and ISA100.11a, and/and ISA100.11a, while/ s/Initially the document/Initially, the document s/be adapted dynamically/be dynamically adapted/ De : 6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] De la part de Thomas Watteyne Envoy=E9 : jeudi 1 ao=FBt 2013 15:13 =C0 : 6TSCH; Ted Lemon (ted.lemon@nominum.com= ); Adrian Farrel (adrian@olddog.co.uk); Marc Bl= anchet Objet : [6tsch] updated charter per BoF suggestion: thoughts? All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_E045AECD98228444A58C61C200AE1BD8413C992Cxmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

 

 <= /p>

Pascal

 <= /p>

From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
Sent: vendredi 2 ao=FBt 2013 08:10
To: dominique.barthel@orange.com; Thomas Watteyne; 6TSCH
Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts?

 

Hello Raghu

 <= /p>

Thomas, Pascal,<= /span>

This looks very focussed no= w. I have a few things that we need to address -

  1. The statement "Initially, the WG will define a framework to install a static sc= hedule and
  2. run the R= outing Protocol for LLNs (RPL) over that schedule" in the description = of the working group and work item 1 seem to be in conflict. We say we will= work on static schedules which means
  3. that L3 (= RPL) can only query cell/link quality info from TSCH. Work item 1 explicitl= y states - "to describe how an entity
    4. can manag= e the TSCH schedule on a 6TSCH node". I feel it is better to remove th= is statement from the work item. 
  4. In this c= ontext, The current work item 1 could possibly be renamed to ,
  5. "Que= ry methods and formats for timeslot/cell parameters"??
  6. Also, it = may be better to flip the order of work items 1,2 (i.e) have "minimal = 6TSCH config" as first work item and
  7. "Que= ry methods and formats for timeslot/cell parameters"=
  8. as work i= tem 1 to reflect the statements made in the description of the working grou= p.
  9.  
  10. I second the point about elaborating on "entity" in = the current work item 1 raised by Dominique and Qin. We could say, "ro= ute management entity"?

 

[] Hum. I talked to Benoi= t, and we concluded that we should consider network management from day 1, = just like we consider security from day 1.

Day 1 for the schedule co= ntrol primitives being now, we need to allow for more general entities than= just routing.

So we are including the c= apability to report timeslot statistics, which may or may or may not be use= d for centralized routing computation in next iteration of the charter, but will be required for network management activities any= way.

 <= /p>

We may also reword the seco= nd paragraph of Description of working group as follows -=

Initially, th= e WG will define a framework to install a static schedule on a 6TSCH networ= k and run the Routing

Protocol for = LLNs (RPL) over that schedule. We will also define methods for RPL to query= parameters and states from the 6TSCH network.

 
[] You are proposing to add the last senten=
ce above. Tis is actually opening a Pandora bow that I’d rather leave=
 close for the time being. RPL may obtain link layer stats and there is not=
hing new there; but we are voluntarily hiding the TSCH aspect at the 6top l=
ayer. We are shooting for simple in the first iteration. To be honest, I=
217;m not sure that in the future, RPL should influence the schedule other =
than indirectly, that is by causing more or less traffic to be routed via p=
articular next hops, thus influencing 6top to modify the size of a bundle. =
Whether I’m right or wrong there, we are delaying this item thus leav=
ing the necessary time for this discussion.
 
In the third paragraph of the description of WG, this statemen=
t -
A dynamic schedule for traffic that is swi=
tched at the timeslot level may for example be computed centrally by an ent=
ity located on the backbone.
can be reworded as -
The TSCH schedule may be computed =
by a central entity located in the backbone (or co-located with the 6TSCH n=
etwork gateway), with out without information from the routing protocol. (Im not sure we need to get into more detail here, =
since this is just the description of the WG).

 


[] this is a secondary piece that opens for the next iterations. What =
we want to indicate is that the track operation is in future scope, kind of=
 locking this work to this WG even if it is not in scope now. We voluntaril=
y use the terms “routed” and “switched” for the rea=
sons I evoked in my answer to Qin. Switched =3D=3D track, whether installed=
 by PCE or RSVP type of operation, and comes prior to the traffic. Routed o=
peration starts with an initial schedule as covered by this charter, but in=
 the next iteration, the 6top layer in this node will need to interact with=
 its peers in the neighbors to dynamically adapt the bundles to the traffic=
.


 


Does this make sense?

 


Cheers,


 


Pascal

From: <dominique.barthel@orange.com>
Date: Thursday, August 1, 2013 7:01 PM
To: Thomas Watteyne <watteyne@eecs.berkeley.edu>, 6TSCH <6tsch@ietf.org>
Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts?

 

Woww, now this is very fo= cused. This should give us a clear framework to start our work, and hopeful= ly expand later.<= /span>

Overall, I believe the cu= rrent Work Items description could elaborate a bit more.

Specifically, please find= below my questions, followed by other minor remarks/suggested changes.

 

Dominique

 

---------

 

Questions

=AB Produce "Ti= meslot Management Methods and Formats" to describe how an entity can m= anage the TSCH schedule on a 6TSCH node”. The schedule is somewhere d= escribed as being static. In this sentence, the schedule can be “managed̶= 1; by an “entity”. What prevents the so-called entity to “= ;manage” the schedule, i.e. allocate slots, based on some information= such as traffic requirements? In which case, what does “static”= ; mean? Probably “imposed upon the 6top layer” (if such notion still e= xists) by some external mechanism.

 

“or learnt by a nod= e when joining the network, possibly in a format as defined by work item 1.= ”

Do you mean the descripti= on of the schedule would be provided “in-band” to the joining n= ode (through EB’s or similar mechanism). This does not seem to fit th= e description of work item 1, where the “entity” is an upper lay= er. Or do you mean as a payload transported on a default cell/link between = upper layer entities ?<= /o:p>

 

“3. Produce "6= TSCH architecture" to describe the design and implementation of 6TSCH = networks. This document will highlight the different architectural blocks and signaling flows, including the operation of the network in the presenc= e of multiple BBRs.”

Does this include any for= m of multi-hop ND? In light of the discussion at 6lo BoF on this topic, how= will compare to 6lowpan-ND?=

 

Sentences unclear to me

“A dynamic schedule= for traffic that is switched at the timeslot level may for example be comp= uted centrally by an entity located on the backbone.”  This sent= ence is complex and unclear to me overall. Consider rephrasing?

“Produce "Time= slot Management Methods and Formats" to describe how an entity can man= age the TSCH schedule on a 6TSCH node”. Is it assumed that everybody = knows what “entity” is supposed to mean in this context?

 

Minor changes=

s/in front of interferenc= e/in front of narrow-band interference

s/- implementers guide, c= ollecting/- implementers guide: this document will collect/

s/- coexistence guide, pr= oviding/- coexistence guide: this document will provide/

 

English writi= ng

s/and ISA100.11a, and/and= ISA100.11a, while/

s/Initially the document/= Initially, the document=

s/be adapted dynamically/= be dynamically adapted/=

 

 

 

 

De : 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
Envoy=E9 : jeudi 1 ao=FBt 2013 15:13
=C0 : 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.co.uk); Marc Blanchet
Objet : [6tsch] updated charter per BoF suggestion: thoughts?

 <= /o:p>

All,

 <= /o:p>

Thanks to al= l for for the effort of putting together the BoF on Tuesday! One of the sug= gestions was to simplify the charter, in particular by reducing the number = of work items.

 <= /o:p>

After discus= sion and suggestions from numerous 6TSCH and other people here at the IETF,= the chairs have created a new, simplified version of the draft, which we h= ave uploaded in the repo at:

 <= /o:p>

This e-mail = is to start a discussion on the ML about this revamped charter. Please send= comments directly to this thread. Ideally, we would like to converge withi= n a couple of days, so let's start the discussion right now.

 <= /o:p>

Pascal &= Thomas

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--_000_E045AECD98228444A58C61C200AE1BD8413C992Cxmbrcdx01ciscoc_-- From qinwang@berkeley.edu Fri Aug 2 04:34:53 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 41B1421E8328 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:34:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.358 X-Spam-Level: X-Spam-Status: No, score=-2.358 tagged_above=-999 required=5 tests=[AWL=-0.382, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_BACKHAIR_53=1, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QzotT7KvaWzU for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:34:49 -0700 (PDT) Received: from mail-oa0-f42.google.com (mail-oa0-f42.google.com [209.85.219.42]) by ietfa.amsl.com (Postfix) with ESMTP id A92A111E8241 for <6tsch@ietf.org>; Fri, 2 Aug 2013 04:34:48 -0700 (PDT) Received: by mail-oa0-f42.google.com with SMTP id i18so1105720oag.1 for <6tsch@ietf.org>; Fri, 02 Aug 2013 04:34:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:x-gm-message-state; bh=nAWBNRf/WDdG1KLTZ7OeiZej6WBHZJV5WC8jQXS9H5I=; b=U4F3Tn0KGRoez+/fxf7V+pV9bKDY8ioV2bKBtbYVJ/nqi9zikKTzw/QVPlHN2kdcKY 5fvglUZSvzo2UqaX9XFWw4OulM1QIQE3L/Y6jswTsNWSvGuITXuSUR8vf0GAQklyIk5g orCQKVBkwQfwEPbjRRKWZxV38VPz/vJ/d5WtXDPCjlvnug2qHok2mZFGl3C7Vt+3iBn6 VLWOIQRti6ln+7ud1XId6SFYIHlrylDthPodX2LDoHe2LnoPt9oSVVuUHhVUUSY6Wx79 LTC5g6JOg4omoDfCj6YPxIinwkbjUzz+dY/DOg4bC1lnQ4trdg41piINvM03Sp9+Ajx/ YNIw== MIME-Version: 1.0 X-Received: by 10.50.20.195 with SMTP id p3mr248738ige.26.1375443270753; Fri, 02 Aug 2013 04:34:30 -0700 (PDT) Received: by 10.64.171.82 with HTTP; Fri, 2 Aug 2013 04:34:30 -0700 (PDT) In-Reply-To: References: Date: Fri, 2 Aug 2013 19:34:30 +0800 Message-ID: From: Qin Wang To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=047d7bd74b6a8fed1504e2f55704 X-Gm-Message-State: ALoCoQmaMkjyMrPDZdzYcAuc2wELLag33CtcPhvhTyGxrKVNqOIHaLZKxISsGrlnIT24oFF0Fboi Cc: Thomas Watteyne , "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 11:34:53 -0000 --047d7bd74b6a8fed1504e2f55704 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pascal, I agree with it. Thanks! Qin On Fri, Aug 2, 2013 at 7:06 PM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Hello Qin:**** > > ** ** > > Thanks for the comments!**** > > ** ** > > With this version of the charter, > 6top is a thin layer that enables the operation in the basic operation as > described in Xavi=92s draftand that=92s it. > **** > > The bare minimum for 6top is a schedule that provides base links for RPL > operations. **** > > Within charter, each node boots with a default schedule, may get an updat= e > at join time and from then on it lives with it. This is what we call stat= ic. > **** > > ** ** > > The more complex pieces of 6top which required standardization:**** > > - dynamic negotiation between peers to allocate timeslots for routed > traffic (your dynamic)**** > > - track allocation for switched traffic (your static?)**** > > - track switching operation (G-MPLS)**** > > are delayed till be have standardized the basic mechanisms to manage the > schedule in the first place.**** > > So we do not consider either distributed or centralized schedule > recomputation. **** > > ** ** > > The focus is on which primitives are needed from / to the device to manag= e > a schedule regardless of which entity is doing the management.**** > > The draft charter is voluntarily agnostic of what that abstract entity is > because the control primitives should be open enough regardless of:**** > > - the type of peer entity (a CNM engine, a PCE, an SDN controller...) ***= * > > - the transport to which the primitive is bound**** > > ** ** > > If the basic operation document becomes the solution for our item1, it > will probably propose a simple method (e.g. CoAP based) to inject a > schedule in every node so we can test interop. The complexity in the > scheduling may not require standardization but may still be discussed in > the first architecture draft.**** > > ** ** > > This is probably enough work for a first round, wouldn=92t you think?**** > > ** ** > > Pascal**** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > > *Sent:* jeudi 1 ao=FBt 2013 23:11 > *To:* Thomas Watteyne > *Cc:* Adrian Farrel (adrian@olddog.co.uk); 6TSCH; Ted Lemon ( > ted.lemon@nominum.com); Marc Blanchet > *Subject:* Re: [6tsch] updated charter per BoF suggestion: thoughts?**** > > ** ** > > Hi Thomas, Pascal and All,**** > > ** ** > > Regarding to the scope, i.e. "Description of Working Group", I would like > to clarify my understanding on "static schedule", and "dynamic schedule" > firstly. **** > > ** ** > > Actually, there are two parameters related to establishing and maintainin= g > a TSCH schedule, one is about "who", which values are (centralized, > decentralized); another one is about change over time, which values are > (static, dynamic). In the current version of 6top, the two parameters are > associated with each other (but not have to), i.e. "centralized" is > associated with "static", because it is assumed that centralized can > optimize resource and avoid collision; and "decentralized" is associated > with "dynamic", because it is assumed collision can not avoided completel= y > by local negotiation.**** > > ** ** > > The Charter says "Initially, the WG will define a framework to install a > static schedule and **** > > run the Routing Protocol for LLNs (RPL) over that schedule. If successful= , > the intent is to recharter to allow for dynamic schedules......". **** > > It means: **** > > step-1: we define methods and messages for establishing TSCH schedule in > the way of (centralized, static); **** > > step-2: we define methods and messages for establishing TSCH schedule in > the way of (centralized, dynamic) and (decentralized, dynamic) ; **** > > ** ** > > Correct?**** > > ** ** > > Based one above, how do you think the combination (decentralized, > dynamic)? For example, allow establishing schedule locally, but do not > allow change, or in another word, change must be instructed by upper laye= r, > instead of by the sublayer.**** > > ** ** > > Thanks**** > > Qin**** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > On Thu, Aug 1, 2013 at 9:12 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > All,**** > > ** ** > > Thanks to all for for the effort of putting together the BoF on Tuesday! > One of the suggestions was to simplify the charter, in particular by > reducing the number of work items.**** > > ** ** > > After discussion and suggestions from numerous 6TSCH and other people her= e > at the IETF, the chairs have created a new, simplified version of the > draft, which we have uploaded in the repo at:**** > > > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6t= sch-00.txt > **** > > ** ** > > This e-mail is to start a discussion on the ML about this revamped > charter. Please send comments directly to this thread. Ideally, we would > like to converge within a couple of days, so let's start the discussion > right now.**** > > ** ** > > Pascal & Thomas**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --047d7bd74b6a8fed1504e2f55704 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
Hi Pascal,

I agree with it. Thanks!

Qin



On Fri, Aug 2, 2013 at 7:06 PM, Pasc= al Thubert (pthubert) <pthubert@cisco.com> wrote:

Hello Qin:

=A0<= /p>

Thanks for the comments!<= u>

=A0<= /p>

With this version of the charter, 6top is a thin layer that enables the operation in the basic operation as = described in Xavi=92s draft and that=92s it.

The bare minimum for 6top= is a schedule that provides base links for RPL operations.

Within charter, each node= boots with a default schedule, may get an update at join time and from the= n on it lives with it. This is what we call static.

=A0<= /p>

The more complex pieces o= f 6top which required standardization:

- dynamic negotiation bet= ween peers to allocate timeslots for routed traffic (your dynamic)

- track allocation for sw= itched traffic (your static?)

- track switching operati= on (G-MPLS)

are delayed till be have = standardized the basic mechanisms to manage the schedule in the first place= .

So we do not consider eit= her distributed or centralized schedule recomputation.

=A0<= /p>

The focus is on which pri= mitives are needed from / to the device to manage a schedule regardless of = which entity is doing the management.

The draft charter is volu= ntarily agnostic of what that abstract entity is because the control primit= ives should be open enough regardless of:

- the type of peer entity= (a CNM engine, a PCE, an SDN controller...)

- the transport to which = the primitive is bound

=A0<= /p>

If the basic operation do= cument becomes the solution for our item1, it will probably propose a simpl= e method (e.g. CoAP based) to inject a schedule in every node so we can test interop. The complexity in the scheduling may not requ= ire standardization but may still be discussed in the first architecture dr= aft.

=A0<= /p>

This is probably enough w= ork for a first round, wouldn=92t you think?

=A0<= /p>

Pascal

=A0<= /p>

From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Qin Wang


Sent: jeudi 1 ao=FBt 2013 23:11
To: Thomas Watteyne
Cc: Adrian Farrel (adrian@olddog.co.uk); 6TSCH; Ted Lemon (ted.lemon@nominum.com); Marc Blanch= et
Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts?

=A0

Hi Thomas, Pascal and All,

=A0

Regarding to the scope, i.e. "Descriptio= n of Working Group", I would like to clarify my understanding o= n "static schedule", and "dynamic schedule" firstly.=A0=

=A0

Actually, there are two parameters related to establ= ishing and maintaining a TSCH schedule, one is about "who", which= values are (centralized, decentralized); another one is about change over = time, which values are (static, dynamic). In the current version of 6top, the two parameters are associated with each o= ther (but not have to), i.e. "centralized" is associated with &qu= ot;static", because it is assumed that centralized can optimize resour= ce and avoid collision; and "decentralized" is associated with "dynamic", because it is assumed collision can not avoided = completely by local negotiation.

=A0

The Charter says =A0"Initially, the WG w= ill define a framework to install a static schedule and=A0=

run = the Routing Protocol for LLNs (RPL) over that schedule.=A0If successful, th= e intent is to recharter to allow for dynamic schedules......". =A0

It means:=A0

step-1: we define methods and messages for establish= ing TSCH schedule in the way of (centralized, static);=A0

step-2: we define =A0methods and messages for establ= ishing TSCH schedule in the way of (centralized, dynamic) and =A0(decentral= ized, dynamic)=A0;=A0

=A0

Correct?

=A0

Based one above, how do you think the combination (d= ecentralized, dynamic)? For example, allow establishing schedule locally, b= ut do not allow change, or in another word, change must be instructed by up= per layer, instead of by the sublayer.

=A0

Thanks

Qin

=A0

=A0

=A0

=A0

=A0

On Thu, Aug 1, 2013 at 9:12 PM, Thomas Watteyne <= watteyne@ee= cs.berkeley.edu> wrote:

All,

=A0

Thanks to all for for the effort of putting together= the BoF on Tuesday! One of the suggestions was to simplify the charter, in= particular by reducing the number of work items.

=A0

After discussion and suggestions from numerous 6TSCH= and other people here at the IETF, the chairs have created a new, simplifi= ed version of the draft, which we have uploaded in the repo at:

=A0

This e-mail is to start a discussion on the ML about= this revamped charter. Please send comments directly to this thread. Ideal= ly, we would like to converge within a couple of days, so let's start t= he discussion right now.

=A0

Pascal & Thomas


_______________________________________________
6tsch mailing list
6tsch@ietf.org
h= ttps://www.ietf.org/mailman/listinfo/6tsch

=A0


--047d7bd74b6a8fed1504e2f55704-- From P.Zand@utwente.nl Fri Aug 2 04:49:22 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BFBE321E838F for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:49:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.503 X-Spam-Level: X-Spam-Status: No, score=-0.503 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id h8YvmVSxS83C for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:49:17 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 0E02E21E838D for <6tsch@ietf.org>; Fri, 2 Aug 2013 04:49:17 -0700 (PDT) Received: from EXHUB02.ad.utwente.nl (130.89.4.229) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Fri, 2 Aug 2013 13:49:18 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB02.ad.utwente.nl ([130.89.4.229]) with mapi id 14.02.0328.009; Fri, 2 Aug 2013 13:49:15 +0200 From: To: , <6tsch@ietf.org>, , , Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOjsPFp8KhUrxB3k6aA7xh+wK+A5mBzZUw Date: Fri, 2 Aug 2013 11:49:14 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA690CE@EXMBX23.ad.utwente.nl> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA690CEEXMBX23adutwent_" MIME-Version: 1.0 Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 11:49:23 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA690CEEXMBX23adutwent_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thomas and Pascal, Many thanks for answering Qin and Raghuram's questions. It makes it more cl= ear. I support this charter. Best Wishes, Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Thursday, August 01, 2013 3:13 PM To: 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.= co.uk); Marc Blanchet Subject: [6tsch] updated charter per BoF suggestion: thoughts? All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA690CEEXMBX23adutwent_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Thomas and Pascal,

Many thanks for answering= Qin and Raghuram’s questions. It makes it more clear.

I support this charter.

Best Wishes,

Pouria<= /p>

 <= /p>

From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
Sent: Thursday, August 01, 2013 3:13 PM
To: 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@= olddog.co.uk); Marc Blanchet
Subject: [6tsch] updated charter per BoF suggestion: thoughts?<= /o:p>

 

All,

 

Thanks to all for for the effort of putting together= the BoF on Tuesday! One of the suggestions was to simplify the charter, in= particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSCH= and other people here at the IETF, the chairs have created a new, simplifi= ed version of the draft, which we have uploaded in the repo at:<= /p>

 

This e-mail is to start a discussion on the ML about= this revamped charter. Please send comments directly to this thread. Ideal= ly, we would like to converge within a couple of days, so let's start the d= iscussion right now.

 

Pascal & Thomas

--_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA690CEEXMBX23adutwent_-- From rafa@um.es Fri Aug 2 04:49:44 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 930DD21E839A for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:49:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.202 X-Spam-Level: X-Spam-Status: No, score=-5.202 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=1.396, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UDO+wFkCEjRR for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 04:49:40 -0700 (PDT) Received: from xenon12.um.es (xenon12.um.es [155.54.212.166]) by ietfa.amsl.com (Postfix) with ESMTP id 1E90A21E834B for <6tsch@ietf.org>; Fri, 2 Aug 2013 04:49:36 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by xenon12.um.es (Postfix) with ESMTP id E6CC64BED1; Fri, 2 Aug 2013 13:49:27 +0200 (CEST) X-Virus-Scanned: by antispam in UMU at xenon12.um.es Received: from xenon12.um.es ([127.0.0.1]) by localhost (xenon12.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 6pfJ71nZVAh5; Fri, 2 Aug 2013 13:49:26 +0200 (CEST) Received: from [10.232.29.254] (unknown [217.41.228.189]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: rafa) by xenon12.um.es (Postfix) with ESMTPSA id 54C354BED2; Fri, 2 Aug 2013 13:49:16 +0200 (CEST) References: <523EF154-B9B3-4FE1-9E1F-891F3288524B@um.es> In-Reply-To: Mime-Version: 1.0 (1.0) Content-Transfer-Encoding: 7bit Content-Type: multipart/alternative; boundary=Apple-Mail-DBB162D0-E6FB-4EB6-B5A2-DA2912D8D844 Message-Id: X-Mailer: iPhone Mail (10B329) From: Rafa Marin Lopez Date: Fri, 2 Aug 2013 13:48:25 +0200 To: "Pascal Thubert (pthubert)" Cc: Thomas Watteyne , "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , Marc Blanchet Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 11:49:44 -0000 --Apple-Mail-DBB162D0-E6FB-4EB6-B5A2-DA2912D8D844 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Thanks Pascal for the clarifications. Completely agree with that (and, of co= urse, with the new charter) Enviado desde mi iPhone El 02/08/2013, a las 10:56, "Pascal Thubert (pthubert)" = escribi=C3=B3: > Certainly Rafa; > =20 > It is fine that some documents stay personal submissions for a while. > We know we need to continue the work that has started on security and expa= nd it. > And hopefully we=E2=80=99ll progress the initial items efficiently and re-= charter soon to take more of the required work on board. > =20 > On security: we probably want to separate the analysis of the particular i= ssues with in one hand: > - issues with this MAC, > - the potential scale of a 6TSCH network, > - the various deployment types (need for profiles?), > =20 > And in the other: > - applicability statements such as PANA > - return from experience (ISA100.11a, Wireless HART) > =20 > The quality and coverage of the work will be a good incentive to make sure= that it can progress in a proper way. > =20 > Cheers, > =20 > Pascal > =20 > From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of R= afa Marin Lopez > Sent: jeudi 1 ao=C3=BBt 2013 23:11 > To: Thomas Watteyne > Cc: Adrian Farrel (adrian@olddog.co.uk); 6TSCH; Ted Lemon (ted.lemon@nomin= um.com); Marc Blanchet > Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? > =20 > Dear Chairs: > =20 > Thanks for this new charter. Evidently, it is more condensed and simplifie= d, which is good, taking into account the comments received during the BOF.=20= > =20 > I have also noticed that security part has been completely removed. Althou= gh my interest was specially based on that part, I understand that these asp= ects could be covered in the future, when the current work for this charter i= s finished. > =20 > Best Regards.=20 > El 01/08/2013, a las 15:12, Thomas Watteyne escribi=C3=B3: >=20 >=20 > All, > =20 > Thanks to all for for the effort of putting together the BoF on Tuesday! O= ne of the suggestions was to simplify the charter, in particular by reducing= the number of work items. > =20 > After discussion and suggestions from numerous 6TSCH and other people here= at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6ts= ch-00.txt > =20 > This e-mail is to start a discussion on the ML about this revamped charter= . Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. > =20 > Pascal & Thomas > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > =20 > ------------------------------------------------------- > Rafael Marin Lopez, PhD > Dept. Information and Communications Engineering (DIIC) > Faculty of Computer Science-University of Murcia > 30100 Murcia - Spain > Telf: +34868888501 Fax: +34868884151 e-mail: rafa@um.es > ------------------------------------------------------- > =20 > =20 > =20 > =20 --Apple-Mail-DBB162D0-E6FB-4EB6-B5A2-DA2912D8D844 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Thanks Pascal for the clarifications. C= ompletely agree with that (and, of course, with the new charter)

Envi= ado desde mi iPhone

El 02/08/2013, a las 10:56, "Pascal Thuber= t (pthubert)" <pthubert@cisco.com> escribi=C3=B3:

Certainly Rafa;

 

It is fine that some docume= nts stay personal submissions for a while.

We know we need to continue= the work that has started on security and expand it.

And hopefully we=E2=80=99ll= progress the initial items efficiently and re-charter soon to take more of t= he required work on board.

 

On security: we probably wa= nt to separate the analysis of the particular issues with in one hand:<= /o:p>

- issues with this MAC,

- the potential scale of a 6= TSCH network,

- the various deployment ty= pes (need for profiles?),

 

And in the other:

- applicability statements s= uch as PANA

- return from experience (I= SA100.11a, Wireless HART)

 

The quality and coverage of= the work will be a good incentive to make sure that it can progress in a pr= oper way.

 

Cheers,

 

Pascal

 

From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Rafa Marin Lopez
Sent: jeudi 1 ao=C3=BBt 2013 23:11
To: Thomas Watteyne
Cc: Adrian Farrel (adrian@oldd= og.co.uk); 6TSCH; Ted Lemon (te= d.lemon@nominum.com); Marc Blanchet
Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts?

 

Dear Chairs:

 

Thanks for this new charter. Evidently, it is more co= ndensed and simplified, which is good, taking into account the comments rece= ived during the BOF. 

 

I have also noticed that security part has been compl= etely removed. Although my interest was specially based on that part, I unde= rstand that these aspects could be covered in the future, when the current w= ork for this charter is finished.

 

Best Regards. 

El 01/08/2013, a las 15:12, Thomas Watteyne escribi=C3= =B3:



All,

 

Thanks to all for for the effort of putting together t= he BoF on Tuesday! One of the suggestions was to simplify the charter, in pa= rticular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSCH a= nd other people here at the IETF, the chairs have created a new, simplified v= ersion of the draft, which we have uploaded in the repo at:

 

This e-mail is to start a discussion on the ML about t= his revamped charter. Please send comments directly to this thread. Ideally,= we would like to converge within a couple of days, so let's start the discu= ssion right now.

 

Pascal & Thomas

_______________________________________________
6tsch mailing list
6tsch@ietf.org
https://www.ietf.org= /mailman/listinfo/6tsch

 

-------------------------------------------------------

Rafael Marin Lopez, PhD

Dept. Information and Communications Engineering (DIIC)

Faculty of Computer Science-University of Murcia

30100 Murcia - Spain

Telf: +34868888501 Fax: +34868884151 e-mail: rafa@um.es

-------------------------------------------------------

 

 

 

 

= --Apple-Mail-DBB162D0-E6FB-4EB6-B5A2-DA2912D8D844-- From twatteyne@gmail.com Fri Aug 2 07:07:51 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 06F1C11E8293 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 07:07:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MN98n+sdzA89 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 07:07:48 -0700 (PDT) Received: from mail-pa0-x236.google.com (mail-pa0-x236.google.com [IPv6:2607:f8b0:400e:c03::236]) by ietfa.amsl.com (Postfix) with ESMTP id 533D111E80D3 for <6tsch@ietf.org>; Fri, 2 Aug 2013 07:07:45 -0700 (PDT) Received: by mail-pa0-f54.google.com with SMTP id kx1so709890pab.13 for <6tsch@ietf.org>; Fri, 02 Aug 2013 07:07:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:x-google-sender-auth:message-id :subject:to:content-type; bh=nf5hiEHv99Ip6oyzRq3K/XbK97HmFdyLdFfrX1+EI6A=; b=lDXcHTq/fXU4wChL0McWPRCwQzip1JLNME9V+mBCq58osigDSPCHYZFpi+D3RUpLBv 2j9kP9Tdq7YOsHNS1YR94YrVQGttrc5p+Z0+LbzEEq+DoPkflCd0xidiu+ve24PC2Wnh 38UXhEwlC1dBtKWl72Px2qLPKVcl8AF2mJaPL8V2G+4FNoYYFiUIxqXcwITYdGsGO9bz hpeIvE5VEN/+aWBsUDBNQmrWoc6OnCF7gTmPRgUTTmHCsBdGhu6Y0x/ptB00bl2k5amM DBuSxnwQdd0zCOlvBK7OZNOvkJVfGo6vSyZ7Hq8gtm6wYKX+tMR753gLUHLXpUsL8Wvj ubMQ== X-Received: by 10.66.51.102 with SMTP id j6mr10571701pao.80.1375452464290; Fri, 02 Aug 2013 07:07:44 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 2 Aug 2013 07:07:24 -0700 (PDT) From: Thomas Watteyne Date: Fri, 2 Aug 2013 16:07:24 +0200 X-Google-Sender-Auth: FCG80NBixHTdtskK_d7jGe2H5OE Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=bcaec544f02e8a288f04e2f77bf2 Subject: [6tsch] no 6TSCH call this week X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 14:07:51 -0000 --bcaec544f02e8a288f04e2f77bf2 Content-Type: text/plain; charset=ISO-8859-1 All, This week is IETF 87, and since most of us are traveling home today, there will exceptionally not be a 6TSCH call this week. Looking forward to speaking next week. Thomas --bcaec544f02e8a288f04e2f77bf2 Content-Type: text/html; charset=ISO-8859-1
All,

This week is IETF 87, and since most of us are traveling home today, there will exceptionally not be a 6TSCH call this week. Looking forward to speaking next week.

Thomas


--bcaec544f02e8a288f04e2f77bf2-- From twatteyne@gmail.com Fri Aug 2 07:47:36 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AADC121E80AB for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 07:47:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QhFRgJAgSkxe for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 07:47:35 -0700 (PDT) Received: from mail-pa0-x22a.google.com (mail-pa0-x22a.google.com [IPv6:2607:f8b0:400e:c03::22a]) by ietfa.amsl.com (Postfix) with ESMTP id 1C16421E8099 for <6tsch@ietf.org>; Fri, 2 Aug 2013 07:47:35 -0700 (PDT) Received: by mail-pa0-f42.google.com with SMTP id lj1so755159pab.1 for <6tsch@ietf.org>; Fri, 02 Aug 2013 07:47:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:content-type; bh=IGakyzM7+XQW5J8+aGZ3wBJNVA7aAixouNR8tcahveQ=; b=lpb7d5dZ7dNCmqe8ih1jChRvDjgIuFmgNO6d520bb1iwyQjl6s1MpD5Lx3w0pWfmJS X8emquXwkHVRdf2fJhhtvbuWq0SrhouexmB8+UPLppZ6n66vN9j4M+KvEI4jkGPFP2lg ylg1hlsARRhkbbxcGIccinEgUBUg3N8zgcR1D0WEKQIGHTya9bLxnl8Z87lx1DT/CO6c o0IFF9qg1zWynQCdyyxn5bkF3oPZVZ+9Q7GCtDRWnLqDdHVq2WkCGfeEywT7ogta8jsW 5IMu5OPxNOxukpXPriukI2f9HBfZV1vB3btVHsNn+cWE1pB4EQZ8afhtHraED4GUx97W saNw== X-Received: by 10.66.120.145 with SMTP id lc17mr10882159pab.182.1375454854706; Fri, 02 Aug 2013 07:47:34 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 2 Aug 2013 07:47:14 -0700 (PDT) In-Reply-To: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> References: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> From: Thomas Watteyne Date: Fri, 2 Aug 2013 16:47:14 +0200 X-Google-Sender-Auth: K39IsbwUI7sQe-2zujfR3R-KpMo Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=e89a8ffbaca104fa3c04e2f80a7b Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 14:47:36 -0000 --e89a8ffbaca104fa3c04e2f80a7b Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Dominique, Great comments, thanks a million! Please see the answers inline. Thomas On Thu, Aug 1, 2013 at 7:01 PM, wrote: > Woww, now this is very focused. This should give us a clear framework to > start our work, and hopefully expand later.**** > > Overall, I believe the current Work Items description could elaborate a > bit more.**** > > Specifically, please find below my questions, followed by other minor > remarks/suggested changes.**** > > ** ** > > Dominique**** > > ** ** > > ---------**** > > ** ** > > Questions**** > > =AB Produce "Timeslot Management Methods and Formats" to describe how an > entity can manage the TSCH schedule on a 6TSCH node=94. The schedule is > somewhere described as being static. In this sentence, the schedule can b= e > =93managed=94 by an =93entity=94. What prevents the so-called entity to = =93manage=94 > the schedule, i.e. allocate slots, based on some information such as > traffic requirements? In which case, what does =93static=94 mean? Probabl= y > =93imposed upon the 6top layer=94 (if such notion still exists) by some > external mechanism. > I believe we are perfectly in sync. Work item 1 is about the bits-and-bytes to describe the schedule and timeslot information. I makes no assumption on when/how it will be used. As you point out, it can be used (1) in the static schedule case to learn about the health of the network, and (2) to manage the schedule at run-time from an external entity such as a PCE. This second point is out of scope for the moment. **** > > ** =93or learnt by a node when joining the network, possibly in a format = as > defined by work item 1.=94 > > Do you mean the description of the schedule would be provided =93in-band= =94 to > the joining node (through EB=92s or similar mechanism). This does not see= m to > fit the description of work item 1, where the =93entity=94 is an upper la= yer. > Or do you mean as a payload transported on a default cell/link between > upper layer entities ? > The latter is absolutely possible, as detailed in http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html. > **** > > =933. Produce "6TSCH architecture" to describe the design and implementat= ion > of 6TSCH networks. This document will highlight the different architectur= al > blocks and signaling flows, including the operation of the network in the > presence of multiple BBRs.=94 > > Does this include any form of multi-hop ND? In light of the discussion at > 6lo BoF on this topic, how will compare to 6lowpan-ND? > We want the architecture to describe all the contextual information for the reader to get the whole picture, in order to this document to be a good entrypoint into t e work at 6TSCH. It will therefore describe the IPv6 stack and the backbone operation, but the focus will largely be on RPL operation over TSCH networks. > **** > > ** Sentences unclear to me > > =93A dynamic schedule for traffic that is switched at the timeslot level = may > for example be computed centrally by an entity located on the backbone.= =94 > This sentence is complex and unclear to me overall. Consider rephrasing? > Good catch, we reworded the sentence to: For example, an entity located on the backbone can be centrally compute a dynamic schedule for traffic to be switched by the timeslot sublayer. This does not change the meaning of the sentence. > **** > > =93Produce "Timeslot Management Methods and Formats" to describe how an > entity can manage the TSCH schedule on a 6TSCH node=94. Is it assumed tha= t > everybody knows what =93entity=94 is supposed to mean in this context? > I believe that there are several types of entities that may benefit from this format, so we'd like to stay agnostic to the exact nature of the entity in the charter language. This is discuss in http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html and http://www.ietf.org/mail-archive/web/6tsch/current/msg00975.html. > **** > > ** Minor changes > > s/in front of interference/in front of narrow-band interference > Done, thanks! > **** > > s/- implementers guide, collecting/ - implementers guide: this document > will collect/ > Done, thanks! > **** > > s/- coexistence guide, providing/- coexistence guide: this document will > provide/ > Done, thanks! > **** > > ** English writing > > s/and ISA100.11a, and/and ISA100.11a, while/ > Done, thanks! > **** > > s/Initially the document/Initially, the document > Done, thanks! > **** > > s/be adapted dynamically/be dynamically adapted/ > I'm not sure about that. When reading the sentence, having the qualifier "dynamically" after stresses it. I hope you agree. > *De :* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *De la part > de* Thomas Watteyne > *Envoy=E9 :* jeudi 1 ao=FBt 2013 15:13 > *=C0 :* 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel ( > adrian@olddog.co.uk); Marc Blanchet > *Objet :* [6tsch] updated charter per BoF suggestion: thoughts?**** > > ** ** > > All,**** > > ** ** > > Thanks to all for for the effort of putting together the BoF on Tuesday! > One of the suggestions was to simplify the charter, in particular by > reducing the number of work items.**** > > ** ** > > After discussion and suggestions from numerous 6TSCH and other people her= e > at the IETF, the chairs have created a new, simplified version of the > draft, which we have uploaded in the repo at:**** > > > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6t= sch-00.txt > **** > > ** ** > > This e-mail is to start a discussion on the ML about this revamped > charter. Please send comments directly to this thread. Ideally, we would > like to converge within a couple of days, so let's start the discussion > right now.**** > > ** ** > > Pascal & Thomas**** > > _________________________________________________________________________= ________________________________________________ > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages = electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme o= u falsifie. Merci. > > This message and its attachments may contain confidential or privileged i= nformation that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and de= lete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have bee= n modified, changed or falsified. > Thank you. > > --e89a8ffbaca104fa3c04e2f80a7b Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
Dominique,
Great comments, thanks a million! Please se= e the answers inline.
Thomas

On Thu, Aug 1, 2013 at 7:01 PM, <dominique.barthel@orange.com> wrote:

Woww, now this is very focused. This should give = us a clear framework to start our work, and hopefully expand later.<= u>

Overall, I believe the current Work Items descrip= tion could elaborate a bit more.

Specifically, please find below my questions, fol= lowed by other minor remarks/suggested changes.

=A0

Dominique

=A0

---------

=A0

Questions

=AB=A0Produce "Timeslot Management Methods a= nd Formats" to describe how an entity can manage the TSCH schedule on = a 6TSCH node=94. The schedule is somewhere described as being static. In this sentence, the schedule can be =93manage= d=94 by an =93entity=94. What prevents the so-called entity to =93manage=94= the schedule, i.e. allocate slots, based on some information such as traff= ic requirements? In which case, what does =93static=94 mean? Probably =93imposed upon the 6top layer=94 (if such notion still exi= sts) by some external mechanism.

I believe we are perfectly in sync. Work item 1 is about the b= its-and-bytes to describe the schedule and timeslot information. I makes no= assumption on when/how it will be used. As you point out, it can be used (= 1) in the static schedule case to learn about the health of the network, an= d (2) to manage the schedule at run-time from an external entity such as a = PCE. This second point is out of scope for the moment.

=A0=93or learnt by a node w= hen joining the network, possibly in a format as defined by work item 1.=94=

Do you mean the description of the schedule would= be provided =93in-band=94 to the joining node (through EB=92s or similar m= echanism). This does not seem to fit the description of work item 1, where the =93entity=94 is an u= pper layer. Or do you mean as a payload transported on a default cell/link = between upper layer entities ?


The latter is absolutely possible, as detailed in=A0http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html.
=A0

=933. Produce "6TSCH architecture" to describe the des= ign and implementation of 6TSCH networks. This document will highlight the = different architectural blocks and signaling flows, including the operation of the network in the = presence of multiple BBRs.=94

Does this include any form of multi-hop ND? In li= ght of the discussion at 6lo BoF on this topic, how will compare to 6lowpan= -ND?

We want the architecture to describe all the = contextual information for the reader to get the whole picture, in order to= this document to be a good entrypoint into t e work at 6TSCH. It will ther= efore describe the IPv6 stack and the backbone operation, but the focus wil= l largely be on RPL operation over TSCH networks.

=A0Sentences unclear to me<= /span>

=93A dynamic schedule for traffic that is switche= d at the timeslot level may for example be computed centrally by an entity = located on the backbone.=94 =A0This sentence is complex and unclear to me overall. Consider rephrasing= ?

Good catch, we reworded the sente= nce to:
For example, a= n entity located on the backbone can be centrally compute a dynamic schedul= e for traffic to be switched by the timeslot sublayer.
This does not change the meaning of the sentence.

=93Produce "Timeslot Management Methods and = Formats" to describe how an entity can manage the TSCH schedule on a 6= TSCH node=94. Is it assumed that everybody knows what =93entity=94 is supposed to mean in this context?

I believe that there are several types= of entities that may benefit from this format, so we'd like to stay ag= nostic to the exact nature of the entity in the charter language. This is d= iscuss in=A0http://www.ietf.org/mail-archive/web/6tsch/= current/msg00973.html=A0and=A0http://www.ietf.org/m= ail-archive/web/6tsch/current/msg00975.html.

=A0Minor changes

s/in front of interference/in front of narrow-ban= d interference

Done, thanks!

s/- implementers guide, collecting/ - implementers guide: this document will coll= ect/


Done, thanks!= =A0

s/- coexistence guide, providing/- coexistence gu= ide: this document will provide/

Done, thanks!=A0

=A0English writing

s/and ISA100.11a, and/and ISA100.11a, while/

Done, thanks!=A0

s/Initially the document/Initially, the document<= /span>

Done, thanks!=A0

s/be adapted dynamically/be dynamically adapted/<= /span>

I'm not sure about that. When r= eading the sentence, having the qualifier "dynamically" after str= esses it. I hope you agree.

De=A0: 6tsch-bounces@ietf.= org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
Envoy=E9=A0: jeudi 1 ao=FBt 2013 15:13
=C0=A0: 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.co.uk); Marc Bl= anchet
Objet=A0: [6tsch] updated charter per BoF suggestion: thoughts?

=A0

All,

=A0

Thanks to all for for the effort of putting together the BoF on Tuesday!= One of the suggestions was to simplify the charter, in particular by reduc= ing the number of work items.

=A0

After discussion and suggestions from numerous 6TSCH and other people he= re at the IETF, the chairs have created a new, simplified version of the dr= aft, which we have uploaded in the repo at:

=A0

This e-mail is to start a discussion on the ML about this revamped chart= er. Please send comments directly to this thread. Ideally, we would like to= converge within a couple of days, so let's start the discussion right = now.

=A0

Pascal & Thomas

______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.

--e89a8ffbaca104fa3c04e2f80a7b-- From twatteyne@gmail.com Fri Aug 2 07:51:59 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8787621E8087 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 07:51:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZofFUIsfjdWp for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 07:51:56 -0700 (PDT) Received: from mail-pd0-x22d.google.com (mail-pd0-x22d.google.com [IPv6:2607:f8b0:400e:c02::22d]) by ietfa.amsl.com (Postfix) with ESMTP id 77A5621E8094 for <6tsch@ietf.org>; Fri, 2 Aug 2013 07:51:55 -0700 (PDT) Received: by mail-pd0-f173.google.com with SMTP id p11so740630pdj.32 for <6tsch@ietf.org>; Fri, 02 Aug 2013 07:51:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:content-type; bh=CljQihimW2REie+AuDXwZPn+MTuiPBzhMomvkRBh+xE=; b=ROLfPEUn3K0/vSZzeYZnSo/Jps3CJGBtJ5+7vIf5FfN6CnkgAbOD/5ElElFOPmjltE eWFdXfkUNafIYJ00GyObgPZQikbCGiDqxpFLUA5nfFB/4eVao/iNYOb66TojiL5ZHwhe OLiLU/ggjvT9qFyooLJefPyeRkWej8dl9hgvrQ+5Q1552zagVH1/qk4wIghMe/fIs8rx kWdnW3h7kbi4EUdfxCncwTkXS0CBqz3flw6VHG14AOvZZYSTZvM4TTrocbdFmvQ4Yovw Th1n37IleWWYXFLAEZRbh4hw9IeweLzxGCPqC7M7Mt+7wsUttrMhVtnTfy83zv9PTcW1 Qjsg== X-Received: by 10.66.122.99 with SMTP id lr3mr10891983pab.187.1375455111586; Fri, 02 Aug 2013 07:51:51 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 2 Aug 2013 07:51:30 -0700 (PDT) In-Reply-To: References: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> From: Thomas Watteyne Date: Fri, 2 Aug 2013 16:51:30 +0200 X-Google-Sender-Auth: dB0ppMvfa-fzuIc7uMzvWpxCxiI Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b2e0e8f54aaa304e2f81970 Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 14:51:59 -0000 --047d7b2e0e8f54aaa304e2f81970 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable All, We have slighted refined the language of the proposed charter following the discussions in this thread. We feel the text is now ready, please let us know in the next 48h is you notice a major issue with the finalized text. The URL of the latest version has not changed, you can find it at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt Pascal & Thomas On Fri, Aug 2, 2013 at 4:47 PM, Thomas Watteyne wrote: > Dominique, > Great comments, thanks a million! Please see the answers inline. > Thomas > > On Thu, Aug 1, 2013 at 7:01 PM, wrote: > >> Woww, now this is very focused. This should give us a clear framework >> to start our work, and hopefully expand later.**** >> >> Overall, I believe the current Work Items description could elaborate a >> bit more.**** >> >> Specifically, please find below my questions, followed by other minor >> remarks/suggested changes.**** >> >> ** ** >> >> Dominique**** >> >> ** ** >> >> ---------**** >> >> ** ** >> >> Questions**** >> >> =AB Produce "Timeslot Management Methods and Formats" to describe how an >> entity can manage the TSCH schedule on a 6TSCH node=94. The schedule is >> somewhere described as being static. In this sentence, the schedule can = be >> =93managed=94 by an =93entity=94. What prevents the so-called entity to = =93manage=94 >> the schedule, i.e. allocate slots, based on some information such as >> traffic requirements? In which case, what does =93static=94 mean? Probab= ly >> =93imposed upon the 6top layer=94 (if such notion still exists) by some >> external mechanism. >> > > I believe we are perfectly in sync. Work item 1 is about the > bits-and-bytes to describe the schedule and timeslot information. I makes > no assumption on when/how it will be used. As you point out, it can be us= ed > (1) in the static schedule case to learn about the health of the network, > and (2) to manage the schedule at run-time from an external entity such a= s > a PCE. This second point is out of scope for the moment. > > **** >> >> ** =93or learnt by a node when joining the network, possibly in a format >> as defined by work item 1.=94 >> >> Do you mean the description of the schedule would be provided =93in-band= =94 >> to the joining node (through EB=92s or similar mechanism). This does not= seem >> to fit the description of work item 1, where the =93entity=94 is an uppe= r >> layer. Or do you mean as a payload transported on a default cell/link >> between upper layer entities ? >> > > The latter is absolutely possible, as detailed in > http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html. > > >> **** >> >> =933. Produce "6TSCH architecture" to describe the design and >> implementation of 6TSCH networks. This document will highlight the >> different architectural blocks and signaling flows, including the operat= ion >> of the network in the presence of multiple BBRs.=94 >> >> Does this include any form of multi-hop ND? In light of the discussion a= t >> 6lo BoF on this topic, how will compare to 6lowpan-ND? >> > We want the architecture to describe all the contextual information for > the reader to get the whole picture, in order to this document to be a go= od > entrypoint into t e work at 6TSCH. It will therefore describe the IPv6 > stack and the backbone operation, but the focus will largely be on RPL > operation over TSCH networks. > >> **** >> >> ** Sentences unclear to me >> >> =93A dynamic schedule for traffic that is switched at the timeslot level >> may for example be computed centrally by an entity located on the >> backbone.=94 This sentence is complex and unclear to me overall. Consid= er >> rephrasing? >> > Good catch, we reworded the sentence to: > For example, an entity located on the backbone can be centrally compute a > dynamic schedule for traffic to be switched by the timeslot sublayer. > This does not change the meaning of the sentence. > >> **** >> >> =93Produce "Timeslot Management Methods and Formats" to describe how an >> entity can manage the TSCH schedule on a 6TSCH node=94. Is it assumed th= at >> everybody knows what =93entity=94 is supposed to mean in this context? >> > I believe that there are several types of entities that may benefit from > this format, so we'd like to stay agnostic to the exact nature of the > entity in the charter language. This is discuss in > http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html and > http://www.ietf.org/mail-archive/web/6tsch/current/msg00975.html. > >> **** >> >> ** Minor changes >> >> s/in front of interference/in front of narrow-band interference >> > Done, thanks! > >> **** >> >> s/- implementers guide, collecting/ - implementers guide: this document >> will collect/ >> > > Done, thanks! > >> **** >> >> s/- coexistence guide, providing/- coexistence guide: this document will >> provide/ >> > Done, thanks! > >> **** >> >> ** English writing >> >> s/and ISA100.11a, and/and ISA100.11a, while/ >> > Done, thanks! > >> **** >> >> s/Initially the document/Initially, the document >> > Done, thanks! > >> **** >> >> s/be adapted dynamically/be dynamically adapted/ >> > I'm not sure about that. When reading the sentence, having the qualifier > "dynamically" after stresses it. I hope you agree. > >> *De :* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *De la >> part de* Thomas Watteyne >> *Envoy=E9 :* jeudi 1 ao=FBt 2013 15:13 >> *=C0 :* 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel ( >> adrian@olddog.co.uk); Marc Blanchet >> *Objet :* [6tsch] updated charter per BoF suggestion: thoughts?**** >> >> ** ** >> >> All,**** >> >> ** ** >> >> Thanks to all for for the effort of putting together the BoF on Tuesday! >> One of the suggestions was to simplify the charter, in particular by >> reducing the number of work items.**** >> >> ** ** >> >> After discussion and suggestions from numerous 6TSCH and other people >> here at the IETF, the chairs have created a new, simplified version of t= he >> draft, which we have uploaded in the repo at:**** >> >> >> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6= tsch-00.txt >> **** >> >> ** ** >> >> This e-mail is to start a discussion on the ML about this revamped >> charter. Please send comments directly to this thread. Ideally, we would >> like to converge within a couple of days, so let's start the discussion >> right now.**** >> >> ** ** >> >> Pascal & Thomas**** >> >> ________________________________________________________________________= _________________________________________________ >> >> Ce message et ses pieces jointes peuvent contenir des informations confi= dentielles ou privilegiees et ne doivent donc >> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez r= ecu ce message par erreur, veuillez le signaler >> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages= electroniques etant susceptibles d'alteration, >> Orange decline toute responsabilite si ce message a ete altere, deforme = ou falsifie. Merci. >> >> This message and its attachments may contain confidential or privileged = information that may be protected by law; >> they should not be distributed, used or copied without authorisation. >> If you have received this email in error, please notify the sender and d= elete this message and its attachments. >> As emails may be altered, Orange is not liable for messages that have be= en modified, changed or falsified. >> Thank you. >> >> > --047d7b2e0e8f54aaa304e2f81970 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
All,

We have slighted refined the langu= age of the proposed charter following the discussions in this thread. We fe= el the text is now ready, please let us know in the next 48h is you notice = a major issue with the finalized text.

The URL of the latest version has not changed, yo= u can find it at:

Pascal & Thomas
<= br>


On Fri, Aug 2, 2013 at 4:47 PM, Thomas Watteyne <watteyne@eecs.= berkeley.edu> wrote:
Dominique,
Great commen= ts, thanks a million! Please see the answers inline.
Thomas

On Thu, Aug 1, 2013 at 7:01 PM, <dominique.barthel@ora= nge.com> wrote:

Woww, now this is very focused. This should give = us a clear framework to start our work, and hopefully expand later.<= u>

Overall, I believe the current Work Items descrip= tion could elaborate a bit more.

Specifically, please find below my questions, fol= lowed by other minor remarks/suggested changes.

=A0

Dominique

=A0

---------

=A0

Questions

=AB=A0Produce "Timeslot Management Methods a= nd Formats" to describe how an entity can manage the TSCH schedule on = a 6TSCH node=94. The schedule is somewhere described as being static. In this sentence, the schedule can be =93manage= d=94 by an =93entity=94. What prevents the so-called entity to =93manage=94= the schedule, i.e. allocate slots, based on some information such as traff= ic requirements? In which case, what does =93static=94 mean? Probably =93imposed upon the 6top layer=94 (if such notion still exi= sts) by some external mechanism.

I believe we are perfectly in sync. Work item 1 is about= the bits-and-bytes to describe the schedule and timeslot information. I ma= kes no assumption on when/how it will be used. As you point out, it can be = used (1) in the static schedule case to learn about the health of the netwo= rk, and (2) to manage the schedule at run-time from an external entity such= as a PCE. This second point is out of scope for the moment.

=A0=93or learnt by a node w= hen joining the network, possibly in a format as defined by work item 1.=94=

Do you mean the description of the schedule would= be provided =93in-band=94 to the joining node (through EB=92s or similar m= echanism). This does not seem to fit the description of work item 1, where the =93entity=94 is an u= pper layer. Or do you mean as a payload transported on a default cell/link = between upper layer entities ?


The latter is absolutely possible, as detailed in=A0http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html.
=A0

=933. Produce "6TSCH architecture" to describe the des= ign and implementation of 6TSCH networks. This document will highlight the = different architectural blocks and signaling flows, including the operation of the network in the = presence of multiple BBRs.=94

Does this include any form of multi-hop ND? In li= ght of the discussion at 6lo BoF on this topic, how will compare to 6lowpan= -ND?

We want the architecture to describe al= l the contextual information for the reader to get the whole picture, in or= der to this document to be a good entrypoint into t e work at 6TSCH. It wil= l therefore describe the IPv6 stack and the backbone operation, but the foc= us will largely be on RPL operation over TSCH networks.

=A0Sentences unclear to me<= /span>

=93A dynamic schedule for traffic that is switche= d at the timeslot level may for example be computed centrally by an entity = located on the backbone.=94 =A0This sentence is complex and unclear to me overall. Consider rephrasing= ?

Good catch, we reworded the= sentence to:
For exam= ple, an entity located on the backbone can be centrally compute a dynamic s= chedule for traffic to be switched by the timeslot sublayer.
This does not change the meaning of the sentence.

=93Produce "Timeslot Management Methods and = Formats" to describe how an entity can manage the TSCH schedule on a 6= TSCH node=94. Is it assumed that everybody knows what =93entity=94 is supposed to mean in this context?

=A0Minor changes

s/in front of interference/in front of narrow-ban= d interference

Done, thanks!<= /div>

s/- implementers guide, collecting/ - implementers guide: this document will coll= ect/


Done, tha= nks!=A0

s/- coexistence guide, providing/- coexistence gu= ide: this document will provide/

Done, thanks!=A0

=A0English writing

s/and ISA100.11a, and/and ISA100.11a, while/

Done, thanks!=A0

s/Initially the document/Initially, the document<= /span>

Done, thanks!=A0

s/be adapted dynamically/be dynamically adapted/<= /span>

I'm not sure about that. = When reading the sentence, having the qualifier "dynamically" aft= er stresses it. I hope you agree.

De=A0: 6tsch-bounces@ietf.= org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
Envoy=E9=A0: jeudi 1 ao=FBt 2013 15:13
=C0=A0: 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.co.uk); Marc Bl= anchet
Objet=A0: [6tsch] updated charter per BoF suggestion: thoughts?

=A0

All,

=A0

Thanks to all for for the effort of putting together the BoF on Tuesday!= One of the suggestions was to simplify the charter, in particular by reduc= ing the number of work items.

=A0

After discussion and suggestions from numerous 6TSCH and other people he= re at the IETF, the chairs have created a new, simplified version of the dr= aft, which we have uploaded in the repo at:

=A0

This e-mail is to start a discussion on the ML about this revamped chart= er. Please send comments directly to this thread. Ideally, we would like to= converge within a couple of days, so let's start the discussion right = now.

=A0

Pascal & Thomas

______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.


--047d7b2e0e8f54aaa304e2f81970-- From rstruik.ext@gmail.com Fri Aug 2 08:13:07 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B8CFA21E80B0 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 08:13:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.398 X-Spam-Level: X-Spam-Status: No, score=-2.398 tagged_above=-999 required=5 tests=[AWL=0.200, BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AM0zPgCyOTWr for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 08:12:55 -0700 (PDT) Received: from mail-ob0-x231.google.com (mail-ob0-x231.google.com [IPv6:2607:f8b0:4003:c01::231]) by ietfa.amsl.com (Postfix) with ESMTP id 36EA321E80AB for <6tsch@ietf.org>; Fri, 2 Aug 2013 08:12:55 -0700 (PDT) Received: by mail-ob0-f177.google.com with SMTP id f8so1363498obp.22 for <6tsch@ietf.org>; Fri, 02 Aug 2013 08:12:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type; bh=WYiWbxMiVk8WN3CXodUDX2+L2SGkRjs1oxVPw8UrsQU=; b=z2thFpaSiBkiI0ofAmx9OBOBrYuCAVpngMnfhkPBYh+3MUbMltyzKJP79/W60blj6b FGhAdjTAf3Fq72hyksiQw7pAVj1NyiwI8fFUqPiSmxu7CnITnlXmJP7SFMuqIY1BG+rr FkJx1bFX0KFCJ52yvA8jyhu7cvpbGIQvWDt/dtKzlfXzkMlEQsqiSZufyEvFye3GjYHi H+76O1dbeMi0o/wuL9Nd9zpuA/VVeQmZPoJ6EvdXYAGn4h3jKz00N1QYIAIBk7LI6cmp S6Xd6wrLa8a4i8HKA1HMK3VyLHawHlE0x0bsdgbfzJN1clt2jtyEv/mHaMIRW+I3RlKX ++dQ== X-Received: by 10.182.213.162 with SMTP id nt2mr5629152obc.44.1375456374727; Fri, 02 Aug 2013 08:12:54 -0700 (PDT) Received: from [192.168.1.105] (CPE0013100e2c51-CM001cea35caa6.cpe.net.cable.rogers.com. [99.231.4.27]) by mx.google.com with ESMTPSA id q8sm8672688obl.11.2013.08.02.08.12.51 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 02 Aug 2013 08:12:53 -0700 (PDT) Message-ID: <51FBCC6A.4010701@gmail.com> Date: Fri, 02 Aug 2013 11:12:42 -0400 From: Rene Struik User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 MIME-Version: 1.0 To: Thomas Watteyne References: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> In-Reply-To: Content-Type: multipart/alternative; boundary="------------070808060506050903020709" Cc: "Pascal Thubert \(pthubert\)" , 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 15:13:07 -0000 This is a multi-part message in MIME format. --------------070808060506050903020709 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi Thomas, Pascal: Is the intention to leave security out of the present charter and potentially consider as follow-up item with rechartering, or is this somehow captured implicitly under work item #2 (given "learnt when joining the network" language). I would suggest to make this more explicit. I have one question re Description of the Working Group: the text suggests a static schedule "once the network is formed". What if one has a network that may change in composition (e.g., one first only has a PAN coordinator and adds devices along the way, or has to add/remove devices while in operation). Wouldn't this potentially have an impact on scheduling? (otherwise, wouldn't one have to be clairvoyant as to which devices will be on the network and when?) Best regards, Rene Description of Working Group: ----------------------------- Initially, the WG will define a framework to install a static schedule that remains unchanged once the network is formed, and to run the Routing Protocol for LLNs (RPL) over that schedule. If successful, the intent is to recharter to allow for dynamic schedules. Work Items: ----------- The group will: 1. Produce "Timeslot Management Methods and Formats" to describe how an entity can manage the TSCH schedule on a 6TSCH node, and query timeslot information from that node. Metrics such as timeslot quality reports are in scope, but the actual bindings to transport operation are not. 2. Produce "Minimal 6TSCH Configuration" to define how to build a 6TSCH network using the Routing Protocol for LLNs (RPL). This document will assume a static TSCH schedule, which can be either hardcoded, or learnt by a node when joining the network, possibly in a format as defined by work item 1. 3. Produce "6TSCH architecture" to describe the design and implementation of 6TSCH networks. This document will highlight the different architectural blocks and signaling flows, including the operation of the network in the presence of multiple BBRs. Initially, the document will focus on distributed routing operation over a static TSCH schedule. On 8/2/2013 10:51 AM, Thomas Watteyne wrote: > All, > > We have slighted refined the language of the proposed charter > following the discussions in this thread. We feel the text is now > ready, please let us know in the next 48h is you notice a major issue > with the finalized text. > > The URL of the latest version has not changed, you can find it at: > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt > > Pascal & Thomas > > > > On Fri, Aug 2, 2013 at 4:47 PM, Thomas Watteyne > > wrote: > > Dominique, > Great comments, thanks a million! Please see the answers inline. > Thomas > > On Thu, Aug 1, 2013 at 7:01 PM, > wrote: > > Woww, now this is very focused. This should give us a clear > framework to start our work, and hopefully expand later. > > Overall, I believe the current Work Items description could > elaborate a bit more. > > Specifically, please find below my questions, followed by > other minor remarks/suggested changes. > > Dominique > > --------- > > Questions > > « Produce "Timeslot Management Methods and Formats" to > describe how an entity can manage the TSCH schedule on a 6TSCH > node". The schedule is somewhere described as being static. In > this sentence, the schedule can be "managed" by an "entity". > What prevents the so-called entity to "manage" the schedule, > i.e. allocate slots, based on some information such as traffic > requirements? In which case, what does "static" mean? Probably > "imposed upon the 6top layer" (if such notion still exists) by > some external mechanism. > > > I believe we are perfectly in sync. Work item 1 is about the > bits-and-bytes to describe the schedule and timeslot information. > I makes no assumption on when/how it will be used. As you point > out, it can be used (1) in the static schedule case to learn about > the health of the network, and (2) to manage the schedule at > run-time from an external entity such as a PCE. This second point > is out of scope for the moment. > > "or learnt by a node when joining the network, possibly in a > format as defined by work item 1." > > Do you mean the description of the schedule would be provided > "in-band" to the joining node (through EB's or similar > mechanism). This does not seem to fit the description of work > item 1, where the "entity" is an upper layer. Or do you mean > as a payload transported on a default cell/link between upper > layer entities ? > > > The latter is absolutely possible, as detailed in > http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html. > > "3. Produce "6TSCH architecture" to describe the design and > implementation of 6TSCH networks. This document will highlight > the different architectural blocks and signaling flows, > including the operation of the network in the presence of > multiple BBRs." > > Does this include any form of multi-hop ND? In light of the > discussion at 6lo BoF on this topic, how will compare to > 6lowpan-ND? > > We want the architecture to describe all the contextual > information for the reader to get the whole picture, in order to > this document to be a good entrypoint into t e work at 6TSCH. It > will therefore describe the IPv6 stack and the backbone operation, > but the focus will largely be on RPL operation over TSCH networks. > > Sentences unclear to me > > "A dynamic schedule for traffic that is switched at the > timeslot level may for example be computed centrally by an > entity located on the backbone." This sentence is complex and > unclear to me overall. Consider rephrasing? > > Good catch, we reworded the sentence to: > For example, an entity located on the backbone can be centrally > compute a dynamic schedule for traffic to be switched by the > timeslot sublayer. > This does not change the meaning of the sentence. > > "Produce "Timeslot Management Methods and Formats" to describe > how an entity can manage the TSCH schedule on a 6TSCH node". > Is it assumed that everybody knows what "entity" is supposed > to mean in this context? > > I believe that there are several types of entities that may > benefit from this format, so we'd like to stay agnostic to the > exact nature of the entity in the charter language. This is > discuss in > http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html and > http://www.ietf.org/mail-archive/web/6tsch/current/msg00975.html. > > Minor changes > > s/in front of interference/in front of narrow-band interference > > Done, thanks! > > s/- implementers guide, collecting/- implementers guide: this > document will collect/ > > > Done, thanks! > > s/- coexistence guide, providing/- coexistence guide: this > document will provide/ > > Done, thanks! > > English writing > > s/and ISA100.11a, and/and ISA100.11a, while/ > > Done, thanks! > > s/Initially the document/Initially, the document > > Done, thanks! > > s/be adapted dynamically/be dynamically adapted/ > > I'm not sure about that. When reading the sentence, having the > qualifier "dynamically" after stresses it. I hope you agree. > > *De :*6tsch-bounces@ietf.org > [mailto:6tsch-bounces@ietf.org > ] *De la part de* Thomas Watteyne > *Envoyé :* jeudi 1 août 2013 15:13 > *À :* 6TSCH; Ted Lemon (ted.lemon@nominum.com > ); Adrian Farrel > (adrian@olddog.co.uk ); Marc Blanchet > *Objet :* [6tsch] updated charter per BoF suggestion: thoughts? > > All, > > Thanks to all for for the effort of putting together the BoF > on Tuesday! One of the suggestions was to simplify the > charter, in particular by reducing the number of work items. > > After discussion and suggestions from numerous 6TSCH and other > people here at the IETF, the chairs have created a new, > simplified version of the draft, which we have uploaded in the > repo at: > > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt > > This e-mail is to start a discussion on the ML about this > revamped charter. Please send comments directly to this > thread. Ideally, we would like to converge within a couple of > days, so let's start the discussion right now. > > Pascal & Thomas > > _________________________________________________________________________________________________________________________ > > Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. > > This message and its attachments may contain confidential or privileged information that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and delete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. > Thank you. > > > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch -- email: rstruik.ext@gmail.com | Skype: rstruik cell: +1 (647) 867-5658 | US: +1 (415) 690-7363 --------------070808060506050903020709 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
Hi Thomas, Pascal:

Is the intention to leave security out of the present charter and potentially consider as follow-up item with rechartering, or is this somehow captured implicitly under work item #2 (given "learnt when joining the network" language). I would suggest to make this more explicit.

I have one question re Description of the Working Group:
the text suggests a static schedule "once the network is formed". What if one has a network that may change in composition (e.g., one first only has a PAN coordinator and adds devices along the way, or has to add/remove devices while in operation). Wouldn't this potentially have an impact on scheduling? (otherwise, wouldn't one have to be clairvoyant as to which devices will be on the network and when?)

Best regards, Rene

Description of Working Group:
-----------------------------

Initially, the WG will define a framework to install a static schedule that
remains unchanged once the network is formed, and to run the Routing Protocol
for LLNs (RPL) over that schedule.

If successful, the intent is to recharter to allow for dynamic schedules.


Work Items:
-----------

The group will:

1. Produce "Timeslot Management Methods and Formats" to describe how an entity
can manage the TSCH schedule on a 6TSCH node, and query timeslot information
from that node. Metrics such as timeslot quality reports are in scope, but
the actual bindings to transport operation are not.

2. Produce "Minimal 6TSCH Configuration" to define how to build a 6TSCH network
using the Routing Protocol for LLNs (RPL). This document will assume a static
TSCH schedule, which can be either hardcoded, or learnt by a node when joining
the network, possibly in a format as defined by work item 1.

3. Produce "6TSCH architecture" to describe the design and implementation of
6TSCH networks. This document will highlight the different architectural blocks
and signaling flows, including the operation of the network in the presence of
multiple BBRs. Initially, the document will focus on distributed routing
operation over a static TSCH schedule.

On 8/2/2013 10:51 AM, Thomas Watteyne wrote:
All,

We have slighted refined the language of the proposed charter following the discussions in this thread. We feel the text is now ready, please let us know in the next 48h is you notice a major issue with the finalized text.

The URL of the latest version has not changed, you can find it at:

Pascal & Thomas



On Fri, Aug 2, 2013 at 4:47 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wrote:
Dominique,
Great comments, thanks a million! Please see the answers inline.
Thomas

On Thu, Aug 1, 2013 at 7:01 PM, <dominique.barthel@orange.com> wrote:

Woww, now this is very focused. This should give us a clear framework to start our work, and hopefully expand later.

Overall, I believe the current Work Items description could elaborate a bit more.

Specifically, please find below my questions, followed by other minor remarks/suggested changes.

 

Dominique

 

---------

 

Questions

« Produce "Timeslot Management Methods and Formats" to describe how an entity can manage the TSCH schedule on a 6TSCH node”. The schedule is somewhere described as being static. In this sentence, the schedule can be “managed” by an “entity”. What prevents the so-called entity to “manage” the schedule, i.e. allocate slots, based on some information such as traffic requirements? In which case, what does “static” mean? Probably “imposed upon the 6top layer” (if such notion still exists) by some external mechanism.


I believe we are perfectly in sync. Work item 1 is about the bits-and-bytes to describe the schedule and timeslot information. I makes no assumption on when/how it will be used. As you point out, it can be used (1) in the static schedule case to learn about the health of the network, and (2) to manage the schedule at run-time from an external entity such as a PCE. This second point is out of scope for the moment.

 “or learnt by a node when joining the network, possibly in a format as defined by work item 1.”

Do you mean the description of the schedule would be provided “in-band” to the joining node (through EB’s or similar mechanism). This does not seem to fit the description of work item 1, where the “entity” is an upper layer. Or do you mean as a payload transported on a default cell/link between upper layer entities ?


The latter is absolutely possible, as detailed in http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html.
 

“3. Produce "6TSCH architecture" to describe the design and implementation of 6TSCH networks. This document will highlight the different architectural blocks and signaling flows, including the operation of the network in the presence of multiple BBRs.”

Does this include any form of multi-hop ND? In light of the discussion at 6lo BoF on this topic, how will compare to 6lowpan-ND?

We want the architecture to describe all the contextual information for the reader to get the whole picture, in order to this document to be a good entrypoint into t e work at 6TSCH. It will therefore describe the IPv6 stack and the backbone operation, but the focus will largely be on RPL operation over TSCH networks.

 Sentences unclear to me

“A dynamic schedule for traffic that is switched at the timeslot level may for example be computed centrally by an entity located on the backbone.”  This sentence is complex and unclear to me overall. Consider rephrasing?

Good catch, we reworded the sentence to:
For example, an entity located on the backbone can be centrally compute a dynamic schedule for traffic to be switched by the timeslot sublayer.
This does not change the meaning of the sentence.

“Produce "Timeslot Management Methods and Formats" to describe how an entity can manage the TSCH schedule on a 6TSCH node”. Is it assumed that everybody knows what “entity” is supposed to mean in this context?

I believe that there are several types of entities that may benefit from this format, so we'd like to stay agnostic to the exact nature of the entity in the charter language. This is discuss in http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html and http://www.ietf.org/mail-archive/web/6tsch/current/msg00975.html.

 Minor changes

s/in front of interference/in front of narrow-band interference

Done, thanks!

s/- implementers guide, collecting/ - implementers guide: this document will collect/


Done, thanks! 

s/- coexistence guide, providing/- coexistence guide: this document will provide/

Done, thanks! 

 English writing

s/and ISA100.11a, and/and ISA100.11a, while/

Done, thanks! 

s/Initially the document/Initially, the document

Done, thanks! 

s/be adapted dynamically/be dynamically adapted/

I'm not sure about that. When reading the sentence, having the qualifier "dynamically" after stresses it. I hope you agree.

De : 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
Envoyé : jeudi 1 août 2013 15:13
À : 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.co.uk); Marc Blanchet
Objet : [6tsch] updated charter per BoF suggestion: thoughts?

 

All,

 

Thanks to all for for the effort of putting together the BoF on Tuesday! One of the suggestions was to simplify the charter, in particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSCH and other people here at the IETF, the chairs have created a new, simplified version of the draft, which we have uploaded in the repo at:

 

This e-mail is to start a discussion on the ML about this revamped charter. Please send comments directly to this thread. Ideally, we would like to converge within a couple of days, so let's start the discussion right now.

 

Pascal & Thomas

_________________________________________________________________________________________________________________________

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--------------070808060506050903020709-- From twatteyne@gmail.com Fri Aug 2 09:54:24 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AB62A21F84A8 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 09:54:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.677 X-Spam-Level: X-Spam-Status: No, score=-1.677 tagged_above=-999 required=5 tests=[AWL=-0.300, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_24=0.6, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PvSSPQo2dVyH for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 09:54:22 -0700 (PDT) Received: from mail-pb0-x236.google.com (mail-pb0-x236.google.com [IPv6:2607:f8b0:400e:c01::236]) by ietfa.amsl.com (Postfix) with ESMTP id A745621F9703 for <6tsch@ietf.org>; Fri, 2 Aug 2013 09:54:10 -0700 (PDT) Received: by mail-pb0-f54.google.com with SMTP id ro12so894276pbb.27 for <6tsch@ietf.org>; Fri, 02 Aug 2013 09:54:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:content-type; bh=hstrynFdsNa4lazexQWtnOTP9R2poYkk3SoYymes7GI=; b=pOd6x9qskHAkNpBXhc7IKlnnveYwTUFNQK5D8USuxL6ZH+PxCGEnjvc24W9N/E2Myc eBr62weLYcFsSLvN8tvqreLgVCk+QWMeC+fChMB34qudbrMs7akqvUqDFWDZ3SjmUDB4 BwHlPOYr9sFDsXjo8Bl3/aJomozynTumWY7c4vLGWxtmAgUIENYIx0RXRuSm9aeL73yX O6HxlINK5ZnlhYcPjrAYo+8F+f9N0V8Bcm9JLf3UI75jATVuQ9aBu32aLtaTGmTbKvn8 eyKqY9aUy8Q/mg+CEza7AbtTeHD9ZcLXdRAhEDunlv2mrjX+8zyVWWa4gcdNvDUcKHAt YR/g== X-Received: by 10.66.142.107 with SMTP id rv11mr11787655pab.17.1375462449274; Fri, 02 Aug 2013 09:54:09 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 2 Aug 2013 09:53:49 -0700 (PDT) In-Reply-To: <51FBCC6A.4010701@gmail.com> References: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> <51FBCC6A.4010701@gmail.com> From: Thomas Watteyne Date: Fri, 2 Aug 2013 18:53:49 +0200 X-Google-Sender-Auth: E4vRQ1V6ZZ0kTizOXJlaX_a1H10 Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=001a11331e46b0e4cc04e2f9ce7d Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 16:54:24 -0000 --001a11331e46b0e4cc04e2f9ce7d Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Rene, The feedback we got both from the BoF and the discussions afterwards was that we needed to reduce the scope of the charter, especially the work items. Essentially, we needed to more clearly highlight the order of the work that needs to be done, and identify the first steps. The proposed charter is therefore not saying "this is the solution we want to build", but rather "these are the first steps towards that solution". As a consequence, what was removed during the revamping process are not things we do not want to do, but rather what we don't want to do right now. As stated in the charter, if we are successful, the intent is to recharter to proceed to the next steps. The result is that the draft charter contains only the very first steps. We believe that the completed work items will form a solid basis on which to build the next steps. We need to start with something very simple, and throughout the discussion we had at the IETF, it became clear that the simplest case is one where the schedule is static, i.e. once a node has joined a network, its schedule does no change. Obviously, this does not exploit all the possibilities of a TSCH network, but allows us to work on the interaction between TSCH and RPL for example. Once we have that, we can start working on dynamically allocating timeslots. To answer your question, while work item 2 can certainly contain a minimal security recommendations, the real work on security will happen when we start to deal with dynamic allocation of time slots, for example the establishment of a secure session between the nodes and the PCE. As you pointed out, it is premature to talk about a security solution; the first step is to define the requirements, then come up with a general architecture. This can only happen once we introduce new element, such as the PCE. About your second remark, I agree that the text is ambiguous. I have modified the language and committed. Initially, the WG will consider a framework to install a static schedule. I= n this case, a node's schedule remains unchanged after it is done joining the network. The Routing Protocol for LLNs (RPL) is used on the resulting network. Thomas On Fri, Aug 2, 2013 at 5:12 PM, Rene Struik wrote: > Hi Thomas, Pascal: > > Is the intention to leave security out of the present charter and > potentially consider as follow-up item with rechartering, or is this > somehow captured implicitly under work item #2 (given "learnt when joinin= g > the network" language). I would suggest to make this more explicit. > > I have one question re Description of the Working Group: > the text suggests a static schedule "once the network is formed". What if > one has a network that may change in composition (e.g., one first only ha= s > a PAN coordinator and adds devices along the way, or has to add/remove > devices while in operation). Wouldn't this potentially have an impact on > scheduling? (otherwise, wouldn't one have to be clairvoyant as to which > devices will be on the network and when?) > > Best regards, Rene > > > Description of Working Group:----------------------------- > > > > Initially, the WG will define a framework to install a static schedule th= atremains unchanged once the network is formed, and to run the Routing Prot= ocol > for LLNs (RPL) over that schedule. > > If successful, the intent is to recharter to allow for dynamic schedules. > > > > Work Items:-----------The group will:1. Produce "Timeslot Management Meth= ods and Formats" to describe how an entity > can manage the TSCH schedule on a 6TSCH node, and query timeslot informat= ionfrom that node. Metrics such as timeslot quality reports are in scope, b= utthe actual bindings to transport operation are not. > 2. Produce "Minimal 6TSCH Configuration" to define how to build a 6TSCH n= etworkusing the Routing Protocol for LLNs (RPL). This document will assume = a staticTSCH schedule, which can be either hardcoded, or learnt by a node w= hen joining > the network, possibly in a format as defined by work item 1. > 3. Produce "6TSCH architecture" to describe the design and implementation= of6TSCH networks. This document will highlight the different architectural= blocksand signaling flows, including the operation of the network in the p= resence of > multiple BBRs. Initially, the document will focus on distributed routingo= peration over a static TSCH schedule. > > > > On 8/2/2013 10:51 AM, Thomas Watteyne wrote: > > All, > > We have slighted refined the language of the proposed charter following > the discussions in this thread. We feel the text is now ready, please let > us know in the next 48h is you notice a major issue with the finalized te= xt. > > The URL of the latest version has not changed, you can find it at: > > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6t= sch-00.txt > > Pascal & Thomas > > > > On Fri, Aug 2, 2013 at 4:47 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote: > >> Dominique, >> Great comments, thanks a million! Please see the answers inline. >> Thomas >> >> On Thu, Aug 1, 2013 at 7:01 PM, wrote: >> >>> Woww, now this is very focused. This should give us a clear framework >>> to start our work, and hopefully expand later. >>> >>> Overall, I believe the current Work Items description could elaborate a >>> bit more. >>> >>> Specifically, please find below my questions, followed by other minor >>> remarks/suggested changes. >>> >>> >>> >>> Dominique >>> >>> >>> >>> --------- >>> >>> >>> >>> Questions >>> >>> =AB Produce "Timeslot Management Methods and Formats" to describe how a= n >>> entity can manage the TSCH schedule on a 6TSCH node=94. The schedule is >>> somewhere described as being static. In this sentence, the schedule can= be >>> =93managed=94 by an =93entity=94. What prevents the so-called entity to= =93manage=94 >>> the schedule, i.e. allocate slots, based on some information such as >>> traffic requirements? In which case, what does =93static=94 mean? Proba= bly >>> =93imposed upon the 6top layer=94 (if such notion still exists) by some >>> external mechanism. >>> >> >> I believe we are perfectly in sync. Work item 1 is about the >> bits-and-bytes to describe the schedule and timeslot information. I make= s >> no assumption on when/how it will be used. As you point out, it can be u= sed >> (1) in the static schedule case to learn about the health of the network= , >> and (2) to manage the schedule at run-time from an external entity such = as >> a PCE. This second point is out of scope for the moment. >> >> =93or learnt by a node when joining the network, possibly in a forma= t >>> as defined by work item 1.=94 >>> >>> Do you mean the description of the schedule would be provided =93in-ban= d=94 >>> to the joining node (through EB=92s or similar mechanism). This does no= t seem >>> to fit the description of work item 1, where the =93entity=94 is an upp= er >>> layer. Or do you mean as a payload transported on a default cell/link >>> between upper layer entities ? >>> >> >> The latter is absolutely possible, as detailed in >> http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html. >> >> >>> =933. Produce "6TSCH architecture" to describe the design and >>> implementation of 6TSCH networks. This document will highlight the >>> different architectural blocks and signaling flows, including the opera= tion >>> of the network in the presence of multiple BBRs.=94 >>> >>> Does this include any form of multi-hop ND? In light of the discussion >>> at 6lo BoF on this topic, how will compare to 6lowpan-ND? >>> >> We want the architecture to describe all the contextual information for >> the reader to get the whole picture, in order to this document to be a g= ood >> entrypoint into t e work at 6TSCH. It will therefore describe the IPv6 >> stack and the backbone operation, but the focus will largely be on RPL >> operation over TSCH networks. >> >>> Sentences unclear to me >>> >>> =93A dynamic schedule for traffic that is switched at the timeslot leve= l >>> may for example be computed centrally by an entity located on the >>> backbone.=94 This sentence is complex and unclear to me overall. Consi= der >>> rephrasing? >>> >> Good catch, we reworded the sentence to: >> For example, an entity located on the backbone can be centrally compute >> a dynamic schedule for traffic to be switched by the timeslot sublayer. >> This does not change the meaning of the sentence. >> >>> =93Produce "Timeslot Management Methods and Formats" to describe how = an >>> entity can manage the TSCH schedule on a 6TSCH node=94. Is it assumed t= hat >>> everybody knows what =93entity=94 is supposed to mean in this context? >>> >> I believe that there are several types of entities that may benefit >> from this format, so we'd like to stay agnostic to the exact nature of t= he >> entity in the charter language. This is discuss in >> http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html and >> http://www.ietf.org/mail-archive/web/6tsch/current/msg00975.html. >> >>> Minor changes >>> >>> s/in front of interference/in front of narrow-band interference >>> >> Done, thanks! >> >>> s/- implementers guide, collecting/ - implementers guide: this >>> document will collect/ >>> >> >> Done, thanks! >> >>> s/- coexistence guide, providing/- coexistence guide: this document >>> will provide/ >>> >> Done, thanks! >> >>> English writing >>> >>> s/and ISA100.11a, and/and ISA100.11a, while/ >>> >> Done, thanks! >> >>> s/Initially the document/Initially, the document >>> >> Done, thanks! >> >>> s/be adapted dynamically/be dynamically adapted/ >>> >> I'm not sure about that. When reading the sentence, having the >> qualifier "dynamically" after stresses it. I hope you agree. >> >>> *De :* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *De la >>> part de* Thomas Watteyne >>> *Envoy=E9 :* jeudi 1 ao=FBt 2013 15:13 >>> *=C0 :* 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel ( >>> adrian@olddog.co.uk); Marc Blanchet >>> *Objet :* [6tsch] updated charter per BoF suggestion: thoughts? >>> >>> >>> >>> All, >>> >>> >>> >>> Thanks to all for for the effort of putting together the BoF on Tuesday= ! >>> One of the suggestions was to simplify the charter, in particular by >>> reducing the number of work items. >>> >>> >>> >>> After discussion and suggestions from numerous 6TSCH and other people >>> here at the IETF, the chairs have created a new, simplified version of = the >>> draft, which we have uploaded in the repo at: >>> >>> >>> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-= 6tsch-00.txt >>> >>> >>> >>> This e-mail is to start a discussion on the ML about this revamped >>> charter. Please send comments directly to this thread. Ideally, we woul= d >>> like to converge within a couple of days, so let's start the discussion >>> right now. >>> >>> >>> >>> Pascal & Thomas >>> >>> _______________________________________________________________________= __________________________________________________ >>> >>> Ce message et ses pieces jointes peuvent contenir des informations conf= identielles ou privilegiees et ne doivent donc >>> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez = recu ce message par erreur, veuillez le signaler >>> a l'expediteur et le detruire ainsi que les pieces jointes. Les message= s electroniques etant susceptibles d'alteration, >>> Orange decline toute responsabilite si ce message a ete altere, deforme= ou falsifie. Merci. >>> >>> This message and its attachments may contain confidential or privileged= information that may be protected by law; >>> they should not be distributed, used or copied without authorisation. >>> If you have received this email in error, please notify the sender and = delete this message and its attachments. >>> As emails may be altered, Orange is not liable for messages that have b= een modified, changed or falsified. >>> Thank you. >>> >>> >> > > > _______________________________________________ > 6tsch mailing list6tsch@ietf.orghttps://www.ietf.org/mailman/listinfo/6ts= ch > > > > -- > email: rstruik.ext@gmail.com | Skype: rstruik > cell: +1 (647) 867-5658 | US: +1 (415) 690-7363 > > --001a11331e46b0e4cc04e2f9ce7d Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
Rene,

The feedback we got both from the= BoF and the discussions afterwards was that we needed to reduce the scope = of the charter, especially the work items. Essentially, we needed to more c= learly highlight the order of the work that needs to be done, and identify = the first steps. The proposed charter is therefore not saying "this is= the solution we want to build", but rather "these are the first = steps towards that solution". As a consequence, what was removed durin= g the revamping process are not things we do not want to do, but rather wha= t we don't want to do right now. As stated in the charter, if we are su= ccessful, the intent is to recharter to proceed to the next steps.

The result is that the draft charter contains only the = very first steps. We believe that the completed work items will form a soli= d basis on which to build the next steps. We need to start with something v= ery simple, and throughout the discussion we had at the IETF, it became cle= ar that the simplest case is one where the schedule is static, i.e. once a = node has joined a network, its schedule does no change. Obviously, this doe= s not exploit all the possibilities of a TSCH network, but allows us to wor= k on the interaction between TSCH and RPL for example. Once we have that, w= e can start working on=A0dynamically=A0allocating timeslots.

To answer your question, while work item 2 can certainl= y contain a minimal security recommendations, the real work on security wil= l happen when we start to deal with dynamic allocation of time slots, for e= xample the establishment of a secure session between the nodes and the PCE.= As you pointed out, it is premature to talk about a security solution; the= first step is to define the requirements, then come up with a general arch= itecture. This can only happen once we introduce new element, such as the P= CE.

About your second remark, I agree that the text is=A0am= biguous. I have modified the language and committed.

Initial= ly, the WG will consider a framework to install a static schedule. In
this case, a node's s= chedule remains unchanged after it is done joining the
network. The Routing Protocol fo= r LLNs (RPL) is used on the resulting network.

<= /div>
Thomas

On Fri, Aug 2, 2013 at 5:12 PM, Rene Struik <rstruik.ext@gmail.com> wrote:
=20 =20 =20
Hi Thomas, Pascal:

Is the intention to leave security out of the present charter and potentially consider as follow-up item with rechartering, or is this somehow captured implicitly under work item #2 (given "lear= nt when joining the network" language). I would suggest to make thi= s more explicit.

I have one question re Description of the Working Group:
the text suggests a static schedule "once the network is formed&= quot;. What if one has a network that may change in composition (e.g., one first only has a PAN coordinator and adds devices along the way, or has to add/remove devices while in operation). Wouldn't this potentially have an impact on scheduling? (otherwise, wouldn't one have to be clairvoyant as to which devices will be o= n the network and when?)

Best regards, Rene


Description of Working Group:
-----------------------------


Initially, the WG will define a framework to install a static schedule that
remains unchanged once the network is for=
med, and to run the Routing Protocol

for LLNs (RPL) over that schedule.

If successful, the intent is to recharter to allow for dynamic schedules.



Work Items:
-----------

The group will:

1. Produce "Timeslot Management Meth=
ods and Formats" to describe how an entity

can manage the TSCH schedule on a 6T=
SCH node, and query timeslot information
from that node. Metrics such as timeslot =
quality reports are in scope, but
the actual bindings to transport operatio=
n are not.


2. Produce "Minimal 6TSCH Conf=
iguration" to define how to build a 6TSCH network
using the Routing Protocol for LLNs (RPL)=
. This document will assume a static
TSCH schedule, which can be either hardco=
ded, or learnt by a node when joining

the network, possibly in a format as=
 defined by work item 1.


3. Produce "6TSCH archite=
cture" to describe the design and implementation of
6TSCH networks. This document will highli=
ght the different architectural blocks
and signaling flows, including the operat=
ion of the network in the presence of

multiple BBRs. Initially, the docum=
ent will focus on distributed routing
operation over a static TSCH schedule.

On 8/2/2013 10:51 AM, Thomas Watteyne wrote:
All,

We have slighted refined the language of the proposed charter following the discussions in this thread. We feel the text is now ready, please let us know in the next 48h is you notice a major issue with the finalized text.

The URL of the latest version has not changed, you can find it at:

Pascal & Thomas



On Fri, Aug 2, 2013 at 4:47 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wrote:
Dominique,
Great comments, thanks a million! Please see the answers inline.
Thomas

On Thu, Aug 1, 2013 at 7:01 PM, = <domin= ique.barthel@orange.com> wrote:

Woww, now this is ver= y focused. This should give us a clear framework to start our work, and hopefully expand later.

Overall, I believe th= e current Work Items description could elaborate a bit more.

Specifically, please = find below my questions, followed by other minor remarks/suggested changes.

=A0

Dominique

=A0

---------

=A0

Questions

=AB=A0Produce "T= imeslot Management Methods and Formats" to describe how an entity can manage the TSCH schedule on a 6TSCH node=94. The schedule is somewhere described as being static. In this sentence, the schedule can be =93managed=94 by an =93entity=94. Wh= at prevents the so-called entity to =93manage=94 the schedule, i.e. allocate slots, based on some information such as traffic requirements? In which case, what does =93static=94 mean? Probably =93imposed upon the 6top layer=94 (if such notion still exists) by some external mechanism.


I believe we are perfectly in sync. Work item 1 is about the bits-and-bytes to describe the schedule and timeslot information. I makes no assumption on when/how it will be used. As you point out, it can be used (1) in the static schedule case to learn about the health of the network, and (2) to manage the schedule at run-time from an external entity such as a PCE. This second point is out of scope for the moment.

=A0=93= or learnt by a node when joining the network, possibly in a format as defined by work item 1.=94

Do you mean the descrip= tion of the schedule would be provided =93in-band=94 to the joining node (through EB=92s or similar mechanism). This does not seem to fit the description of work item 1, where the =93entity=94 is an upper layer. Or do you mean as a payload transported on a default cell/link between upper layer entities ?


The latter is absolutely possible, as detailed in=A0http://www.ietf.org/mail-arc= hive/web/6tsch/current/msg00973.html.
=A0

=933. Produce "6TSCH architecture" to d= escribe the design and implementation of 6TSCH networks. This document will highlight the different architectural blocks and signaling flows, including the operation of the network in the presence of multiple BBRs.=94

Does this include any= form of multi-hop ND? In light of the discussion at 6lo BoF on this topic, how will compare to 6lowpan-ND?

We want the architecture to describe all the contextual information for the reader to get the whole picture, in order to this document to be a good entrypoint into t e work at 6TSCH. It will therefore describe the IPv6 stack and the backbone operation, but the focus will largely be on RPL operation over TSCH networks.

=A0Sen= tences unclear to me

=93A dynamic schedule= for traffic that is switched at the timeslot level may for example be computed centrally by an entity located on the backbone.=94 =A0This sentence is complex an= d unclear to me overall. Consider rephrasing?

Good catch, we reworded the sentence to:
For example, an entity located on the backbone can be centrally compute a dynamic schedule for traffic to be switched by the timeslot sublayer.
This does not change the meaning of the sentence.

=93Produce "Time= slot Management Methods and Formats" to describe how an entity can manage the TSCH schedule on a 6TSCH node=94. Is it assumed that everybody knows what =93entity=94 is supposed to mean in this context?

I believe that there are several types of entities that may benefit from this format, so we'd like to stay agnostic to the exact nature of the entity in the charter language. This is discuss in=A0http://www.ietf.org/= mail-archive/web/6tsch/current/msg00973.html=A0and=A0http://www.ietf.org/mail-archive/web/6tsch/current/msg00975.html.

=A0Min= or changes

s/in front of interference/in front of narrow-band interference

Done, thanks!

s/- implementers guid= e, collecting/ - implementers = guide: this document will collect/


Done, thanks!=A0

s/- coexistence guide= , providing/- coexistence guide: this document will provide/

Done, thanks!=A0

=A0Eng= lish writing

s/and ISA100.11a, and= /and ISA100.11a, while/

Done, thanks!=A0

s/Initially the document/Initially, the document

Done, thanks!=A0

s/be adapted dynamica= lly/be dynamically adapted/

I'm not sure about that. When reading the sentence, having the qualifier "dynamically"= ; after stresses it. I hope you agree.

De=A0: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
Envoy=E9=A0: jeudi 1 ao=FBt 2013 15:= 13
=C0=A0: 6TSCH; Ted Lemon (ted.lemon@nominum.com)= ; Adrian Farrel (adrian@olddog.co.uk); Marc Blanchet
Objet=A0: [6tsch] updated charter per BoF suggestion: thoughts?

=A0

All,

=A0

Thanks to all for for the effort of putting together the BoF on Tuesday! One of the suggestions was to simplify the charter, in particular by reducing the number of work items.

=A0

After discussion and suggestions from numerous 6TSCH and other people here at the IETF, the chairs have created a new, simplified version of the draft, which we have uploaded in the repo at:

=A0

This e-mail is to start a discussion on the ML about this revamped charter. Please send comments directly to this thread. Ideally, we would like to converge within a couple of days, so let's start the discussion right now.

=A0

Pascal & Thomas

____________________________________________=
___________________________________________________________________________=
__

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.





_______________________________________________
6tsch mailing list
6tsch@ietf.org
h=
ttps://www.ietf.org/mailman/listinfo/6tsch



--=20
email: rstruik.e=
xt@gmail.com | Skype: rstruik
cell: +1 (647) 867-5658 | US: +1 (415) 690-7363=

--001a11331e46b0e4cc04e2f9ce7d-- From rsudhaak@cisco.com Fri Aug 2 10:14:07 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 56CD811E80E7 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 10:14:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EhmOmuzPmJK8 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 10:14:01 -0700 (PDT) Received: from rcdn-iport-4.cisco.com (rcdn-iport-4.cisco.com [173.37.86.75]) by ietfa.amsl.com (Postfix) with ESMTP id 5D26121E80AB for <6tsch@ietf.org>; Fri, 2 Aug 2013 10:13:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=42647; q=dns/txt; s=iport; t=1375463617; x=1376673217; h=from:to:subject:date:message-id:in-reply-to:mime-version; bh=pyk60GAjo0gHSpZaw2rGOwZyYLlp1LFuipycbOLfUsw=; b=M5uf4ZyMWo9u5KHlx9LZv06VJ1xCFmI7WOdBLu1q36RWQ+Eip4b4dRDP 7/AmB06MC7n20Z0Vip7Us2v0Y3IpWi2iQyAu0rDahmwg06WLUpUh7GI1k cqWy+gMPPxAZRW8U0PmFfHTRTLlgobF2oPdFYs/UlMKzWRAVBCRNLl6UC o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Aj0FADTo+1GtJXG9/2dsb2JhbABaDoI0RDVQvn6BHRZ0giQBAQEELV4BCBEBAgEBAQsWAQY5FAMGCAIEARIIiAgMuQwEjlAQgQcgDQoBBoMTdAOFRI5ElSWCWT6BcTk X-IronPort-AV: E=Sophos;i="4.89,802,1367971200"; d="scan'208,217";a="242930033" Received: from rcdn-core2-2.cisco.com ([173.37.113.189]) by rcdn-iport-4.cisco.com with ESMTP; 02 Aug 2013 17:13:36 +0000 Received: from xhc-rcd-x08.cisco.com (xhc-rcd-x08.cisco.com [173.37.183.82]) by rcdn-core2-2.cisco.com (8.14.5/8.14.5) with ESMTP id r72HDaJm021959 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 2 Aug 2013 17:13:36 GMT Received: from xmb-rcd-x04.cisco.com ([169.254.8.99]) by xhc-rcd-x08.cisco.com ([173.37.183.82]) with mapi id 14.02.0318.004; Fri, 2 Aug 2013 12:13:35 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: "Pascal Thubert (pthubert)" , "dominique.barthel@orange.com" , "Thomas Watteyne" , 6TSCH <6tsch@ietf.org>, "Benoit Claise (bclaise)" Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOj6OeA0peJlBankqBszyBnwxOPQ== Date: Fri, 2 Aug 2013 17:13:34 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B18501CAE@xmb-rcd-x04.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.21.127.82] Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B18501CAExmbrcdx04ciscoc_" MIME-Version: 1.0 Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 17:14:07 -0000 --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B18501CAExmbrcdx04ciscoc_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Pascal, Thanks for the clarifications. The charter looks good now. I support it. -raghuram From: "Pascal Thubert (pthubert)" > Date: Friday, August 2, 2013 1:30 PM To: raghuram sudhaakar >, "do= minique.barthel@orange.com" >, Thomas Watteyne = >, 6TSCH <6ts= ch@ietf.org>, "Benoit Claise (bclaise)" > Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? Pascal From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak) Sent: vendredi 2 ao=FBt 2013 08:10 To: dominique.barthel@orange.com; Thom= as Watteyne; 6TSCH Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? Hello Raghu Thomas, Pascal, This looks very focussed now. I have a few things that we need to address - 1. The statement "Initially, the WG will define a framework to install a= static schedule and 2. run the Routing Protocol for LLNs (RPL) over that schedule" in the de= scription of the working group and work item 1 seem to be in conflict. We s= ay we will work on static schedules which means 3. that L3 (RPL) can only query cell/link quality info from TSCH. Work i= tem 1 explicitly states - "to describe how an entity 4. can manage the TSCH schedule on a 6TSCH node". I feel it is better to= remove this statement from the work item. 5. In this context, The current work item 1 could possibly be renamed to= , 6. "Query methods and formats for timeslot/cell parameters"?? 7. Also, it may be better to flip the order of work items 1,2 (i.e) have= "minimal 6TSCH config" as first work item and 8. "Query methods and formats for timeslot/cell parameters" 9. as work item 1 to reflect the statements made in the description of t= he working group. 10. 11. I second the point about elaborating on "entity" in the current work = item 1 raised by Dominique and Qin. We could say, "route management entity"= ? [] Hum. I talked to Benoit, and we concluded that we should consider networ= k management from day 1, just like we consider security from day 1. Day 1 for the schedule control primitives being now, we need to allow for m= ore general entities than just routing. So we are including the capability to report timeslot statistics, which may= or may or may not be used for centralized routing computation in next iter= ation of the charter, but will be required for network management activitie= s anyway. We may also reword the second paragraph of Description of working group as = follows - Initially, the WG will define a framework to install a static schedule on a= 6TSCH network and run the Routing Protocol for LLNs (RPL) over that schedule. We will also define methods for= RPL to query parameters and states from the 6TSCH network. [] You are proposing to add the last sentence above. Tis is actually openin= g a Pandora bow that I=92d rather leave close for the time being. RPL may o= btain link layer stats and there is nothing new there; but we are voluntari= ly hiding the TSCH aspect at the 6top layer. We are shooting for simple in = the first iteration. To be honest, I=92m not sure that in the future, RPL s= hould influence the schedule other than indirectly, that is by causing more= or less traffic to be routed via particular next hops, thus influencing 6t= op to modify the size of a bundle. Whether I=92m right or wrong there, we a= re delaying this item thus leaving the necessary time for this discussion. In the third paragraph of the description of WG, this statement - A dynamic schedule for traffic that is switched at the timeslot level may f= or example be computed centrally by an entity located on the backbone. can be reworded as - The TSCH schedule may be computed by a central entity located in the backbo= ne (or co-located with the 6TSCH network gateway), with out without informa= tion from the routing protocol. (Im not sure we need to get into more detai= l here, since this is just the description of the WG). [] this is a secondary piece that opens for the next iterations. What we wa= nt to indicate is that the track operation is in future scope, kind of lock= ing this work to this WG even if it is not in scope now. We voluntarily use= the terms =93routed=94 and =93switched=94 for the reasons I evoked in my a= nswer to Qin. Switched =3D=3D track, whether installed by PCE or RSVP type = of operation, and comes prior to the traffic. Routed operation starts with = an initial schedule as covered by this charter, but in the next iteration, = the 6top layer in this node will need to interact with its peers in the nei= ghbors to dynamically adapt the bundles to the traffic. Does this make sense? Cheers, Pascal From: > Date: Thursday, August 1, 2013 7:01 PM To: Thomas Watteyne >, 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? Woww, now this is very focused. This should give us a clear framework to st= art our work, and hopefully expand later. Overall, I believe the current Work Items description could elaborate a bit= more. Specifically, please find below my questions, followed by other minor remar= ks/suggested changes. Dominique --------- Questions =AB Produce "Timeslot Management Methods and Formats" to describe how an en= tity can manage the TSCH schedule on a 6TSCH node=94. The schedule is somew= here described as being static. In this sentence, the schedule can be =93ma= naged=94 by an =93entity=94. What prevents the so-called entity to =93manag= e=94 the schedule, i.e. allocate slots, based on some information such as t= raffic requirements? In which case, what does =93static=94 mean? Probably = =93imposed upon the 6top layer=94 (if such notion still exists) by some ext= ernal mechanism. =93or learnt by a node when joining the network, possibly in a format as de= fined by work item 1.=94 Do you mean the description of the schedule would be provided =93in-band=94= to the joining node (through EB=92s or similar mechanism). This does not s= eem to fit the description of work item 1, where the =93entity=94 is an upp= er layer. Or do you mean as a payload transported on a default cell/link be= tween upper layer entities ? =933. Produce "6TSCH architecture" to describe the design and implementatio= n of 6TSCH networks. This document will highlight the different architectur= al blocks and signaling flows, including the operation of the network in th= e presence of multiple BBRs.=94 Does this include any form of multi-hop ND? In light of the discussion at 6= lo BoF on this topic, how will compare to 6lowpan-ND? Sentences unclear to me =93A dynamic schedule for traffic that is switched at the timeslot level ma= y for example be computed centrally by an entity located on the backbone.= =94 This sentence is complex and unclear to me overall. Consider rephrasin= g? =93Produce "Timeslot Management Methods and Formats" to describe how an ent= ity can manage the TSCH schedule on a 6TSCH node=94. Is it assumed that eve= rybody knows what =93entity=94 is supposed to mean in this context? Minor changes s/in front of interference/in front of narrow-band interference s/- implementers guide, collecting/- implementers guide: this document will= collect/ s/- coexistence guide, providing/- coexistence guide: this document will pr= ovide/ English writing s/and ISA100.11a, and/and ISA100.11a, while/ s/Initially the document/Initially, the document s/be adapted dynamically/be dynamically adapted/ De :6tsch-bounces@ietf.org [mailto:6tsch-bou= nces@ietf.org] De la part de Thomas Watteyne Envoy=E9 : jeudi 1 ao=FBt 2013 15:13 =C0 : 6TSCH; Ted Lemon (ted.lemon@nominum.com= ); Adrian Farrel (adrian@olddog.co.uk); Marc Bl= anchet Objet : [6tsch] updated charter per BoF suggestion: thoughts? All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B18501CAExmbrcdx04ciscoc_ Content-Type: text/html; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: quoted-printable
Pascal,
Thanks for the clarifications. The charter looks good now. I support i= t.

-raghuram

From: "Pascal Thubert (pthuber= t)" <pthubert@cisco.com&g= t;
Date: Friday, August 2, 2013 1:30 P= M
To: raghuram sudhaakar <rsudhaak@cisco.com>, "dominique.barthel@orange.com"= ; <dominique.barthel@ora= nge.com>, Thomas Watteyne <watteyne= @eecs.berkeley.edu>, 6TSCH <6ts= ch@ietf.org>, "Benoit Claise (bclaise)" <bclaise@cisco.com>
Subject: Re: [6tsch] updated charte= r per BoF suggestion: thoughts?

&= nbsp;

 

Pascal

 

From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
Sent: vendredi 2 ao=FBt 2013 08:10
To: dominique.barthe= l@orange.com; Thomas Watteyne; 6TSCH
Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts?

 

Hello Raghu

 

Thomas, Pascal,

This looks very focussed now. I have a few = things that we need to address -

  1. The statement "Initially, the WG will define a framework to install a static sc= hedule and
  2. run the R= outing Protocol for LLNs (RPL) over that schedule" in the description = of the working group and work item 1 seem to be in conflict. We say we will= work on static schedules which means
  3. that L3 (= RPL) can only query cell/link quality info from TSCH. Work item 1 explicitl= y states - "to describe how an entity
    4. can manag= e the TSCH schedule on a 6TSCH node". I feel it is better to remove th= is statement from the work item. 
  4. In this c= ontext, The current work item 1 could possibly be renamed to ,
  5. "Que= ry methods and formats for timeslot/cell parameters"??
  6. Also, it = may be better to flip the order of work items 1,2 (i.e) have "minimal = 6TSCH config" as first work item and
  7. "Que= ry methods and formats for timeslot/cell parameters"=
  8. as work i= tem 1 to reflect the statements made in the description of the working grou= p.
  9.  
  10. I sec= ond the point about elaborating on "entity" in the current work i= tem 1 raised by Dominique and Qin. We could say, "route management ent= ity"?

    11.  = ;

    [] Hum. I talked to Benoit, and we= concluded that we should consider network management from day 1, just like= we consider security from day 1.

    Day 1 for the schedule control pri= mitives being now, we need to allow for more general entities than just rou= ting.

    So we are including the capability= to report timeslot statistics, which may or may or may not be used for cen= tralized routing computation in next iteration of the charter, but will be required for network management acti= vities anyway.

     

    We may also reword the second paragraph of = Description of working group as follows -

    Initially, the W= G will define a framework to install a static schedule on a 6TSCH network a= nd run the Routing

    Protocol for LLN= s (RPL) over that schedule. We will also define methods for RPL to query pa= rameters and states from the 6TSCH network.

     
    [] You are proposing to add the last sentence above.=
 Tis is actually opening a Pandora bow that I=92d rather leave close for th=
e time being. RPL may obtain link layer stats and there is nothing new ther=
e; but we are voluntarily hiding the TSCH aspect at the 6top layer. We are =
shooting for simple in the first iteration. To be honest, I=92m not sure th=
at in the future, RPL should influence the schedule other than indirectly, =
that is by causing more or less traffic to be routed via particular next ho=
ps, thus influencing 6top to modify the size of a bundle. Whether I=92m rig=
ht or wrong there, we are delaying this item thus leaving the necessary tim=
e for this discussion.
     
    In th=
e third paragraph of the description of WG, this statement -
    A dynamic schedule for traffic that is swi=
tched at the timeslot level may for example be computed centrally by an ent=
ity located on the backbone.
    can b=
e reworded as -
    The TSCH schedule may be computed =
by a central entity located in the backbone (or co-located with the 6TSCH n=
etwork gateway), with out without information from the routing protocol. (Im not sure we need to get into more detail here, =
since this is just the description of the WG).

     
    

    [] this is a =
secondary piece that opens for the next iterations. What we want to indicat=
e is that the track operation is in future scope, kind of locking this work=
 to this WG even if it is not in scope now. We voluntarily use the terms =
=93routed=94 and =93switched=94 for the reasons I evoked in my answer to Qi=
n. Switched =3D=3D track, whether installed by PCE or RSVP type of operatio=
n, and comes prior to the traffic. Routed operation starts with an initial =
schedule as covered by this charter, but in the next iteration, the 6top la=
yer in this node will need to interact with its peers in the neighbors to d=
ynamically adapt the bundles to the traffic.
    

     
    

    Does this make sense?
    

     
    

    Cheers,
    

     
    

    Pascal

    From: <domin= ique.barthel@orange.com>
    Date: Thursday, August 1, 2013 7:01 PM
    To: Thomas Watteyne <watteyne@eecs.berkeley.edu>, 6TSCH <6tsch@ietf.org>
    Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts?

     

    Woww, now this is very focused. Th= is should give us a clear framework to start our work, and hopefully expand= later.

    Overall, I believe the current Wor= k Items description could elaborate a bit more.

    Specifically, please find below my= questions, followed by other minor remarks/suggested changes.

     

    Dominique

     

    ---------

     

    Questions

    =AB Produce "Timeslot Ma= nagement Methods and Formats" to describe how an entity can manage the= TSCH schedule on a 6TSCH node=94. The schedule is somewhere described as being static. In this sentence, the schedule can be =93manage= d=94 by an =93entity=94. What prevents the so-called entity to =93manage=94= the schedule, i.e. allocate slots, based on some information such as traff= ic requirements? In which case, what does =93static=94 mean? Probably =93imposed upon the 6top layer=94 (if such notion still exi= sts) by some external mechanism.

     

    =93or learnt by a node when joinin= g the network, possibly in a format as defined by work item 1.=94

    Do you mean the description of the= schedule would be provided =93in-band=94 to the joining node (through EB= =92s or similar mechanism). This does not seem to fit the description of work item 1, where the =93entity=94 is an upper = layer. Or do you mean as a payload transported on a default cell/link betwe= en upper layer entities ?

     

    =933. Produce "6TSCH architec= ture" to describe the design and implementation of 6TSCH networks. Thi= s document will highlight the different architectural blocks and signaling flows, including the operation of the network in the = presence of multiple BBRs.=94

    Does this include any form of mult= i-hop ND? In light of the discussion at 6lo BoF on this topic, how will com= pare to 6lowpan-ND?

     

    Sentences unclear to me

    =93A dynamic schedule for traffic = that is switched at the timeslot level may for example be computed centrall= y by an entity located on the backbone.=94  This sentence is complex and unclear to me overall. Consider rephras= ing?

    =93Produce "Timeslot Manageme= nt Methods and Formats" to describe how an entity can manage the TSCH = schedule on a 6TSCH node=94. Is it assumed that everybody knows what =93entity=94 is supposed to mean in this context?

     

    Minor changes

    s/in front of interference/in fron= t of narrow-band interference

    s/- implementers guide, collecting= /- implementers guide: this document will collect/

    s/- coexistence guide, providing/-= coexistence guide: this document will provide/

     

    English writing=

    s/and ISA100.11a, and/and ISA100.1= 1a, while/=

    s/Initially the document/Initially= , the document

    s/be adapted dynamically/be dynami= cally adapted/

     

     

     

     

    De :6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
    Envoy=E9 : jeudi 1 ao=FBt 2013 15:13
    =C0 : 6TSCH; Ted Lemon (    ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.co.uk); Marc Blanchet
    Objet : [6tsch] updated charter per BoF suggestion: thoughts?

     <= /o:p>

    All,

     <= /o:p>

    Thanks to al= l for for the effort of putting together the BoF on Tuesday! One of the sug= gestions was to simplify the charter, in particular by reducing the number = of work items.

     <= /o:p>

    After discus= sion and suggestions from numerous 6TSCH and other people here at the IETF,= the chairs have created a new, simplified version of the draft, which we h= ave uploaded in the repo at:

     <= /o:p>

    This e-mail = is to start a discussion on the ML about this revamped charter. Please send= comments directly to this thread. Ideally, we would like to converge withi= n a couple of days, so let's start the discussion right now.

     <= /o:p>

    Pascal &= Thomas

    ______________________________=
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doivent donc
    pas etre diffuses, exploites o=
u copies sans autorisation. Si vous avez recu ce message par erreur, veuill=
ez le signaler
    a l'expediteur et le detruire =
ainsi que les pieces jointes. Les messages electroniques etant susceptibles=
 d'alteration,
    Orange decline toute responsab=
ilite si ce message a ete altere, deforme ou falsifie. Merci.
     
    This message and its attachmen=
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--_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B18501CAExmbrcdx04ciscoc_-- From rstruik.ext@gmail.com Fri Aug 2 10:17:55 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AB2EC11E80E7 for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 10:17:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.423 X-Spam-Level: X-Spam-Status: No, score=-2.423 tagged_above=-999 required=5 tests=[AWL=0.175, BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pjQmcjBYmuSO for <6tsch@ietfa.amsl.com>; Fri, 2 Aug 2013 10:17:48 -0700 (PDT) Received: from mail-qa0-x229.google.com (mail-qa0-x229.google.com [IPv6:2607:f8b0:400d:c00::229]) by ietfa.amsl.com (Postfix) with ESMTP id BC7C721E80DC for <6tsch@ietf.org>; Fri, 2 Aug 2013 10:17:47 -0700 (PDT) Received: by mail-qa0-f41.google.com with SMTP id bs12so453186qab.0 for <6tsch@ietf.org>; Fri, 02 Aug 2013 10:17:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type; bh=HXw0bOMO9Bv8OA1TMTkA16M4H+DeCT6evYqhxvGC6f8=; b=UXVTo1wSNyW4TjOqU1eEIBsrDbZd2Of7Up+UZq1n/DLPJ+eqaz/2inMqW+sG3RXGeK EclPhIafgYtZqvT2e2MWUjBUAgqmBgC5RWk4niUg8ynvn56bDfYTFTxDajssCFrvR8ck sMVlucaADp58Q/lq6LGWTkrzoNqyMIRadPGcUxuC7Tz00i3IdSakBgAmkUU6SSszEFZl 7SXI1jAESkUTnGgjvg2G2wt3c2+kVFx84kFgHebTd7zKowXOOZV+jipVEvB5l6pH0jru h5Kif9vhnqUNWi33mQ0IX6gPg2ot5IQ1pVfo4dGP3G5arsVjwYc3QcJMsFIewxcfr9jr o6Ug== X-Received: by 10.224.87.194 with SMTP id x2mr12710187qal.30.1375463866889; Fri, 02 Aug 2013 10:17:46 -0700 (PDT) Received: from [192.168.1.102] (CPE0013100e2c51-CM001cea35caa6.cpe.net.cable.rogers.com. [99.231.4.27]) by mx.google.com with ESMTPSA id w2sm4803310qec.8.2013.08.02.10.17.42 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 02 Aug 2013 10:17:45 -0700 (PDT) Message-ID: <51FBE9AE.5020209@gmail.com> Date: Fri, 02 Aug 2013 13:17:34 -0400 From: Rene Struik User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 MIME-Version: 1.0 To: Thomas Watteyne References: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> <51FBCC6A.4010701@gmail.com> In-Reply-To: Content-Type: multipart/alternative; boundary="------------050604030102090401000304" Cc: 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Aug 2013 17:17:55 -0000 This is a multi-part message in MIME format. --------------050604030102090401000304 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi: Thanks for the quick feedback. Perfectly fine now. Rene On 8/2/2013 12:53 PM, Thomas Watteyne wrote: > Rene, > > The feedback we got both from the BoF and the discussions afterwards > was that we needed to reduce the scope of the charter, especially the > work items. Essentially, we needed to more clearly highlight the order > of the work that needs to be done, and identify the first steps. The > proposed charter is therefore not saying "this is the solution we want > to build", but rather "these are the first steps towards that > solution". As a consequence, what was removed during the revamping > process are not things we do not want to do, but rather what we don't > want to do right now. As stated in the charter, if we are successful, > the intent is to recharter to proceed to the next steps. > > The result is that the draft charter contains only the very first > steps. We believe that the completed work items will form a solid > basis on which to build the next steps. We need to start with > something very simple, and throughout the discussion we had at the > IETF, it became clear that the simplest case is one where the schedule > is static, i.e. once a node has joined a network, its schedule does no > change. Obviously, this does not exploit all the possibilities of a > TSCH network, but allows us to work on the interaction between TSCH > and RPL for example. Once we have that, we can start working > on dynamically allocating timeslots. > > To answer your question, while work item 2 can certainly contain a > minimal security recommendations, the real work on security will > happen when we start to deal with dynamic allocation of time slots, > for example the establishment of a secure session between the nodes > and the PCE. As you pointed out, it is premature to talk about a > security solution; the first step is to define the requirements, then > come up with a general architecture. This can only happen once we > introduce new element, such as the PCE. > > About your second remark, I agree that the text is ambiguous. I have > modified the language and committed. > > Initially, the WG will consider a framework to install a static > schedule. In > this case, a node's schedule remains unchanged after it is done > joining the > network. The Routing Protocol for LLNs (RPL) is used on the resulting > network. > > Thomas > > On Fri, Aug 2, 2013 at 5:12 PM, Rene Struik > wrote: > > Hi Thomas, Pascal: > > Is the intention to leave security out of the present charter and > potentially consider as follow-up item with rechartering, or is > this somehow captured implicitly under work item #2 (given "learnt > when joining the network" language). I would suggest to make this > more explicit. > > I have one question re Description of the Working Group: > the text suggests a static schedule "once the network is formed". > What if one has a network that may change in composition (e.g., > one first only has a PAN coordinator and adds devices along the > way, or has to add/remove devices while in operation). Wouldn't > this potentially have an impact on scheduling? (otherwise, > wouldn't one have to be clairvoyant as to which devices will be on > the network and when?) > > Best regards, Rene > > Description of Working Group: > ----------------------------- > > > Initially, the WG will define a framework to install a static schedule that > remains unchanged once the network is formed, and to run the Routing Protocol > for LLNs (RPL) over that schedule. If successful, the intent is to > recharter to allow for dynamic schedules. > > > Work Items: > ----------- > > The group will: > > 1. Produce "Timeslot Management Methods and Formats" to describe how an entity > can manage the TSCH schedule on a 6TSCH node, and query timeslot > information from that node. Metrics such as timeslot quality > reports are in scope, but the actual bindings to transport > operation are not. > 2. Produce "Minimal 6TSCH Configuration" to define how to build a 6TSCH network > using the Routing Protocol for LLNs (RPL). This document will assume a static > TSCH schedule, which can be either hardcoded, or learnt by a node when joining > the network, possibly in a format as defined by work item 1. > 3. Produce "6TSCH architecture" to describe the design and > implementation of 6TSCH networks. This document will highlight the > different architectural blocks and signaling flows, including the > operation of the network in the presence of > multiple BBRs. Initially, the document will focus on distributed routing > operation over a static TSCH schedule. > > > On 8/2/2013 10:51 AM, Thomas Watteyne wrote: >> All, >> >> We have slighted refined the language of the proposed charter >> following the discussions in this thread. We feel the text is now >> ready, please let us know in the next 48h is you notice a major >> issue with the finalized text. >> >> The URL of the latest version has not changed, you can find it at: >> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt >> >> Pascal & Thomas >> >> >> >> On Fri, Aug 2, 2013 at 4:47 PM, Thomas Watteyne >> > >> wrote: >> >> Dominique, >> Great comments, thanks a million! Please see the answers inline. >> Thomas >> >> On Thu, Aug 1, 2013 at 7:01 PM, > > wrote: >> >> Woww, now this is very focused. This should give us a >> clear framework to start our work, and hopefully expand >> later. >> >> Overall, I believe the current Work Items description >> could elaborate a bit more. >> >> Specifically, please find below my questions, followed by >> other minor remarks/suggested changes. >> >> Dominique >> >> --------- >> >> Questions >> >> « Produce "Timeslot Management Methods and Formats" to >> describe how an entity can manage the TSCH schedule on a >> 6TSCH node". The schedule is somewhere described as being >> static. In this sentence, the schedule can be "managed" >> by an "entity". What prevents the so-called entity to >> "manage" the schedule, i.e. allocate slots, based on some >> information such as traffic requirements? In which case, >> what does "static" mean? Probably "imposed upon the 6top >> layer" (if such notion still exists) by some external >> mechanism. >> >> >> I believe we are perfectly in sync. Work item 1 is about the >> bits-and-bytes to describe the schedule and timeslot >> information. I makes no assumption on when/how it will be >> used. As you point out, it can be used (1) in the static >> schedule case to learn about the health of the network, and >> (2) to manage the schedule at run-time from an external >> entity such as a PCE. This second point is out of scope for >> the moment. >> >> "or learnt by a node when joining the network, possibly >> in a format as defined by work item 1." >> >> Do you mean the description of the schedule would be >> provided "in-band" to the joining node (through EB's or >> similar mechanism). This does not seem to fit the >> description of work item 1, where the "entity" is an >> upper layer. Or do you mean as a payload transported on a >> default cell/link between upper layer entities ? >> >> >> The latter is absolutely possible, as detailed in >> http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html. >> >> "3. Produce "6TSCH architecture" to describe the design >> and implementation of 6TSCH networks. This document will >> highlight the different architectural blocks and >> signaling flows, including the operation of the network >> in the presence of multiple BBRs." >> >> Does this include any form of multi-hop ND? In light of >> the discussion at 6lo BoF on this topic, how will compare >> to 6lowpan-ND? >> >> We want the architecture to describe all the contextual >> information for the reader to get the whole picture, in order >> to this document to be a good entrypoint into t e work at >> 6TSCH. It will therefore describe the IPv6 stack and the >> backbone operation, but the focus will largely be on RPL >> operation over TSCH networks. >> >> Sentences unclear to me >> >> "A dynamic schedule for traffic that is switched at the >> timeslot level may for example be computed centrally by >> an entity located on the backbone." This sentence is >> complex and unclear to me overall. Consider rephrasing? >> >> Good catch, we reworded the sentence to: >> For example, an entity located on the backbone can be >> centrally compute a dynamic schedule for traffic to be >> switched by the timeslot sublayer. >> This does not change the meaning of the sentence. >> >> "Produce "Timeslot Management Methods and Formats" to >> describe how an entity can manage the TSCH schedule on a >> 6TSCH node". Is it assumed that everybody knows what >> "entity" is supposed to mean in this context? >> >> I believe that there are several types of entities that may >> benefit from this format, so we'd like to stay agnostic to >> the exact nature of the entity in the charter language. This >> is discuss in >> http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html and >> http://www.ietf.org/mail-archive/web/6tsch/current/msg00975.html. >> >> Minor changes >> >> s/in front of interference/in front of narrow-band >> interference >> >> Done, thanks! >> >> s/- implementers guide, collecting/- implementers guide: >> this document will collect/ >> >> >> Done, thanks! >> >> s/- coexistence guide, providing/- coexistence guide: >> this document will provide/ >> >> Done, thanks! >> >> English writing >> >> s/and ISA100.11a, and/and ISA100.11a, while/ >> >> Done, thanks! >> >> s/Initially the document/Initially, the document >> >> Done, thanks! >> >> s/be adapted dynamically/be dynamically adapted/ >> >> I'm not sure about that. When reading the sentence, having >> the qualifier "dynamically" after stresses it. I hope you agree. >> >> *De :*6tsch-bounces@ietf.org >> >> [mailto:6tsch-bounces@ietf.org >> ] *De la part de* Thomas >> Watteyne >> *Envoyé :* jeudi 1 août 2013 15:13 >> *À :* 6TSCH; Ted Lemon (ted.lemon@nominum.com >> ); Adrian Farrel >> (adrian@olddog.co.uk ); Marc >> Blanchet >> *Objet :* [6tsch] updated charter per BoF suggestion: >> thoughts? >> >> All, >> >> Thanks to all for for the effort of putting together the >> BoF on Tuesday! One of the suggestions was to simplify >> the charter, in particular by reducing the number of work >> items. >> >> After discussion and suggestions from numerous 6TSCH and >> other people here at the IETF, the chairs have created a >> new, simplified version of the draft, which we have >> uploaded in the repo at: >> >> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt >> >> This e-mail is to start a discussion on the ML about this >> revamped charter. Please send comments directly to this >> thread. Ideally, we would like to converge within a >> couple of days, so let's start the discussion right now. >> >> Pascal & Thomas >> >> _________________________________________________________________________________________________________________________ >> >> Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc >> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler >> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, >> Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. >> >> This message and its attachments may contain confidential or privileged information that may be protected by law; >> they should not be distributed, used or copied without authorisation. >> If you have received this email in error, please notify the sender and delete this message and its attachments. >> As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. >> Thank you. >> >> >> >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch > > > -- > email:rstruik.ext@gmail.com | Skype: rstruik > cell:+1 (647) 867-5658 | US:+1 (415) 690-7363 > > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch -- email: rstruik.ext@gmail.com | Skype: rstruik cell: +1 (647) 867-5658 | US: +1 (415) 690-7363 --------------050604030102090401000304 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
Hi:

Thanks for the quick feedback. Perfectly fine now.

Rene

On 8/2/2013 12:53 PM, Thomas Watteyne wrote:
Rene,

The feedback we got both from the BoF and the discussions afterwards was that we needed to reduce the scope of the charter, especially the work items. Essentially, we needed to more clearly highlight the order of the work that needs to be done, and identify the first steps. The proposed charter is therefore not saying "this is the solution we want to build", but rather "these are the first steps towards that solution". As a consequence, what was removed during the revamping process are not things we do not want to do, but rather what we don't want to do right now. As stated in the charter, if we are successful, the intent is to recharter to proceed to the next steps.

The result is that the draft charter contains only the very first steps. We believe that the completed work items will form a solid basis on which to build the next steps. We need to start with something very simple, and throughout the discussion we had at the IETF, it became clear that the simplest case is one where the schedule is static, i.e. once a node has joined a network, its schedule does no change. Obviously, this does not exploit all the possibilities of a TSCH network, but allows us to work on the interaction between TSCH and RPL for example. Once we have that, we can start working on dynamically allocating timeslots.

To answer your question, while work item 2 can certainly contain a minimal security recommendations, the real work on security will happen when we start to deal with dynamic allocation of time slots, for example the establishment of a secure session between the nodes and the PCE. As you pointed out, it is premature to talk about a security solution; the first step is to define the requirements, then come up with a general architecture. This can only happen once we introduce new element, such as the PCE.

About your second remark, I agree that the text is ambiguous. I have modified the language and committed.

Initially, the WG will consider a framework to install a static schedule. In
this case, a node's schedule remains unchanged after it is done joining the
network. The Routing Protocol for LLNs (RPL) is used on the resulting network.

Thomas

On Fri, Aug 2, 2013 at 5:12 PM, Rene Struik <rstruik.ext@gmail.com> wrote:
Hi Thomas, Pascal:

Is the intention to leave security out of the present charter and potentially consider as follow-up item with rechartering, or is this somehow captured implicitly under work item #2 (given "learnt when joining the network" language). I would suggest to make this more explicit.

I have one question re Description of the Working Group:
the text suggests a static schedule "once the network is formed". What if one has a network that may change in composition (e.g., one first only has a PAN coordinator and adds devices along the way, or has to add/remove devices while in operation). Wouldn't this potentially have an impact on scheduling? (otherwise, wouldn't one have to be clairvoyant as to which devices will be on the network and when?)

Best regards, Rene

Description of Working Group:
-----------------------------

Initially, the WG will define a framework to install a static schedule that
remains unchanged once the network is formed, and to run the Routing Protocol

for LLNs (RPL) over that schedule.

If successful, the intent is to recharter to allow for dynamic schedules.


Work Items:
-----------

The group will:

1. Produce "Timeslot Management Methods and Formats" to describe how an entity

can manage the TSCH schedule on a 6TSCH node, and query timeslot information
from that node. Metrics such as timeslot quality reports are in scope, but
the actual bindings to transport operation are not.


2. Produce "Minimal 6TSCH Configuration" to define how to build a 6TSCH network
using the Routing Protocol for LLNs (RPL). This document will assume a static
TSCH schedule, which can be either hardcoded, or learnt by a node when joining

the network, possibly in a format as defined by work item 1.


3. Produce "6TSCH architecture" to describe the design and implementation of
6TSCH networks. This document will highlight the different architectural blocks
and signaling flows, including the operation of the network in the presence of

multiple BBRs. Initially, the document will focus on distributed routing
operation over a static TSCH schedule.

On 8/2/2013 10:51 AM, Thomas Watteyne wrote:
All,

We have slighted refined the language of the proposed charter following the discussions in this thread. We feel the text is now ready, please let us know in the next 48h is you notice a major issue with the finalized text.

The URL of the latest version has not changed, you can find it at:

Pascal & Thomas



On Fri, Aug 2, 2013 at 4:47 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wrote:
Dominique,
Great comments, thanks a million! Please see the answers inline.
Thomas

On Thu, Aug 1, 2013 at 7:01 PM, <dominique.barthel@orange.com> wrote:

Woww, now this is very focused. This should give us a clear framework to start our work, and hopefully expand later.

Overall, I believe the current Work Items description could elaborate a bit more.

Specifically, please find below my questions, followed by other minor remarks/suggested changes.

 

Dominique

 

---------

 

Questions

« Produce "Timeslot Management Methods and Formats" to describe how an entity can manage the TSCH schedule on a 6TSCH node”. The schedule is somewhere described as being static. In this sentence, the schedule can be “managed” by an “entity”. What prevents the so-called entity to “manage” the schedule, i.e. allocate slots, based on some information such as traffic requirements? In which case, what does “static” mean? Probably “imposed upon the 6top layer” (if such notion still exists) by some external mechanism.


I believe we are perfectly in sync. Work item 1 is about the bits-and-bytes to describe the schedule and timeslot information. I makes no assumption on when/how it will be used. As you point out, it can be used (1) in the static schedule case to learn about the health of the network, and (2) to manage the schedule at run-time from an external entity such as a PCE. This second point is out of scope for the moment.

 “or learnt by a node when joining the network, possibly in a format as defined by work item 1.”

Do you mean the description of the schedule would be provided “in-band” to the joining node (through EB’s or similar mechanism). This does not seem to fit the description of work item 1, where the “entity” is an upper layer. Or do you mean as a payload transported on a default cell/link between upper layer entities ?


The latter is absolutely possible, as detailed in http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html.
 

“3. Produce "6TSCH architecture" to describe the design and implementation of 6TSCH networks. This document will highlight the different architectural blocks and signaling flows, including the operation of the network in the presence of multiple BBRs.”

Does this include any form of multi-hop ND? In light of the discussion at 6lo BoF on this topic, how will compare to 6lowpan-ND?

We want the architecture to describe all the contextual information for the reader to get the whole picture, in order to this document to be a good entrypoint into t e work at 6TSCH. It will therefore describe the IPv6 stack and the backbone operation, but the focus will largely be on RPL operation over TSCH networks.

 Sentences unclear to me

“A dynamic schedule for traffic that is switched at the timeslot level may for example be computed centrally by an entity located on the backbone.”  This sentence is complex and unclear to me overall. Consider rephrasing?

Good catch, we reworded the sentence to:
For example, an entity located on the backbone can be centrally compute a dynamic schedule for traffic to be switched by the timeslot sublayer.
This does not change the meaning of the sentence.

“Produce "Timeslot Management Methods and Formats" to describe how an entity can manage the TSCH schedule on a 6TSCH node”. Is it assumed that everybody knows what “entity” is supposed to mean in this context?

I believe that there are several types of entities that may benefit from this format, so we'd like to stay agnostic to the exact nature of the entity in the charter language. This is discuss in http://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html and http://www.ietf.org/mail-archive/web/6tsch/current/msg00975.html.

 Minor changes

s/in front of interference/in front of narrow-band interference

Done, thanks!

s/- implementers guide, collecting/ - implementers guide: this document will collect/


Done, thanks! 

s/- coexistence guide, providing/- coexistence guide: this document will provide/

Done, thanks! 

 English writing

s/and ISA100.11a, and/and ISA100.11a, while/

Done, thanks! 

s/Initially the document/Initially, the document

Done, thanks! 

s/be adapted dynamically/be dynamically adapted/

I'm not sure about that. When reading the sentence, having the qualifier "dynamically" after stresses it. I hope you agree.

De : 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
Envoyé : jeudi 1 août 2013 15:13
À : 6TSCH; Ted Lemon (ted.lemon@nominum.com); Adrian Farrel (adrian@olddog.co.uk); Marc Blanchet
Objet : [6tsch] updated charter per BoF suggestion: thoughts?

 

All,

 

Thanks to all for for the effort of putting together the BoF on Tuesday! One of the suggestions was to simplify the charter, in particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSCH and other people here at the IETF, the chairs have created a new, simplified version of the draft, which we have uploaded in the repo at:

 

This e-mail is to start a discussion on the ML about this revamped charter. Please send comments directly to this thread. Ideally, we would like to converge within a couple of days, so let's start the discussion right now.

 

Pascal & Thomas

_________________________________________________________________________________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.

This message and its attachments may contain confidential or privileged information that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and delete this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified.
Thank you.





_______________________________________________
6tsch mailing list
6tsch@ietf.org
https://www.ietf.org/mailman/listinfo/6tsch



-- 
email: rstruik.ext@gmail.com | Skype: rstruik
cell: +1 (647) 867-5658 | US: +1 (415) 690-7363



_______________________________________________
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https://www.ietf.org/mailman/listinfo/6tsch



-- 
email: rstruik.ext@gmail.com | Skype: rstruik
cell: +1 (647) 867-5658 | US: +1 (415) 690-7363
--------------050604030102090401000304-- From dominique.barthel@orange.com Sat Aug 3 10:12:55 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5212621F9CA2 for <6tsch@ietfa.amsl.com>; Sat, 3 Aug 2013 10:12:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.597 X-Spam-Level: X-Spam-Status: No, score=-2.597 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, UNPARSEABLE_RELAY=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IcRlJGLGfh6M for <6tsch@ietfa.amsl.com>; Sat, 3 Aug 2013 10:12:50 -0700 (PDT) Received: from relais-inet.francetelecom.com (relais-ias92.francetelecom.com [193.251.215.92]) by ietfa.amsl.com (Postfix) with ESMTP id 9A24821F98AD for <6tsch@ietf.org>; Sat, 3 Aug 2013 10:12:49 -0700 (PDT) Received: from omfedm07.si.francetelecom.fr (unknown [xx.xx.xx.3]) by omfedm09.si.francetelecom.fr (ESMTP service) with ESMTP id 81A862DC5A0; Sat, 3 Aug 2013 19:12:48 +0200 (CEST) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.186]) by omfedm07.si.francetelecom.fr (ESMTP service) with ESMTP id 6BB954C168; Sat, 3 Aug 2013 19:12:48 +0200 (CEST) Received: from PEXCVZYM13.corporate.adroot.infra.ftgroup ([fe80::cc7e:e40b:42ef:164e]) by PEXCVZYH01.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.02.0328.009; Sat, 3 Aug 2013 19:12:48 +0200 From: To: Thomas Watteyne , 6TSCH <6tsch@ietf.org> Thread-Topic: [6tsch] updated charter per BoF suggestion: thoughts? Thread-Index: AQHOj48tA0peJlBankqBszyBnwxOPZmB3uUAgAHal/A= Date: Sat, 3 Aug 2013 17:12:47 +0000 Message-ID: <7058_1375549968_51FD3A10_7058_8393_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7F2C5@PEXCVZYM13.corporate.adroot.infra.ftgroup> References: <14802_1375376511_51FA947F_14802_1850_1_8F1D83ADCC1AC94186A867BEE9B7D91306D7ECA7@PEXCVZYM13.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.197.38.1] Content-Type: multipart/alternative; boundary="_000_8F1D83ADCC1AC94186A867BEE9B7D91306D7F2C5PEXCVZYM13corpo_" MIME-Version: 1.0 X-PMX-Version: 5.6.1.2065439, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2013.8.3.154502 Subject: Re: [6tsch] updated charter per BoF suggestion: thoughts? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 03 Aug 2013 17:12:55 -0000 --_000_8F1D83ADCC1AC94186A867BEE9B7D91306D7F2C5PEXCVZYM13corpo_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Thomas, Pascal, Thanks for your detailed answers to my questions and comments. This new charter addresses them all. I support it. Cheers, Dominique De : 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de T= homas Watteyne Envoy=E9 : vendredi 2 ao=FBt 2013 16:52 =C0 : 6TSCH Objet : Re: [6tsch] updated charter per BoF suggestion: thoughts? All, We have slighted refined the language of the proposed charter following the= discussions in this thread. We feel the text is now ready, please let us k= now in the next 48h is you notice a major issue with the finalized text. The URL of the latest version has not changed, you can find it at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt Pascal & Thomas On Fri, Aug 2, 2013 at 4:47 PM, Thomas Watteyne > wrote: Dominique, Great comments, thanks a million! Please see the answers inline. Thomas On Thu, Aug 1, 2013 at 7:01 PM, > wrote: Woww, now this is very focused. This should give us a clear framework to st= art our work, and hopefully expand later. Overall, I believe the current Work Items description could elaborate a bit= more. Specifically, please find below my questions, followed by other minor remar= ks/suggested changes. Dominique --------- Questions =AB Produce "Timeslot Management Methods and Formats" to describe how an en= tity can manage the TSCH schedule on a 6TSCH node". The schedule is somewhe= re described as being static. In this sentence, the schedule can be "manage= d" by an "entity". What prevents the so-called entity to "manage" the sched= ule, i.e. allocate slots, based on some information such as traffic require= ments? In which case, what does "static" mean? Probably "imposed upon the 6= top layer" (if such notion still exists) by some external mechanism. I believe we are perfectly in sync. Work item 1 is about the bits-and-bytes= to describe the schedule and timeslot information. I makes no assumption o= n when/how it will be used. As you point out, it can be used (1) in the sta= tic schedule case to learn about the health of the network, and (2) to mana= ge the schedule at run-time from an external entity such as a PCE. This sec= ond point is out of scope for the moment. "or learnt by a node when joining the network, possibly in a format as def= ined by work item 1." Do you mean the description of the schedule would be provided "in-band" to = the joining node (through EB's or similar mechanism). This does not seem to= fit the description of work item 1, where the "entity" is an upper layer. = Or do you mean as a payload transported on a default cell/link between uppe= r layer entities ? The latter is absolutely possible, as detailed in http://www.ietf.org/mail-= archive/web/6tsch/current/msg00973.html. "3. Produce "6TSCH architecture" to describe the design and implementation = of 6TSCH networks. This document will highlight the different architectural= blocks and signaling flows, including the operation of the network in the = presence of multiple BBRs." Does this include any form of multi-hop ND? In light of the discussion at 6= lo BoF on this topic, how will compare to 6lowpan-ND? We want the architecture to describe all the contextual information for the= reader to get the whole picture, in order to this document to be a good en= trypoint into t e work at 6TSCH. It will therefore describe the IPv6 stack = and the backbone operation, but the focus will largely be on RPL operation = over TSCH networks. Sentences unclear to me "A dynamic schedule for traffic that is switched at the timeslot level may = for example be computed centrally by an entity located on the backbone." T= his sentence is complex and unclear to me overall. Consider rephrasing? Good catch, we reworded the sentence to: For example, an entity located on the backbone can be centrally compute a d= ynamic schedule for traffic to be switched by the timeslot sublayer. This does not change the meaning of the sentence. "Produce "Timeslot Management Methods and Formats" to describe how an entit= y can manage the TSCH schedule on a 6TSCH node". Is it assumed that everybo= dy knows what "entity" is supposed to mean in this context? I believe that there are several types of entities that may benefit from th= is format, so we'd like to stay agnostic to the exact nature of the entity = in the charter language. This is discuss in http://www.ietf.org/mail-archiv= e/web/6tsch/current/msg00973.html and http://www.ietf.org/mail-archive/web/= 6tsch/current/msg00975.html. Minor changes s/in front of interference/in front of narrow-band interference Done, thanks! s/- implementers guide, collecting/ - implementers guide: this document wil= l collect/ Done, thanks! s/- coexistence guide, providing/- coexistence guide: this document will pr= ovide/ Done, thanks! English writing s/and ISA100.11a, and/and ISA100.11a, while/ Done, thanks! s/Initially the document/Initially, the document Done, thanks! s/be adapted dynamically/be dynamically adapted/ I'm not sure about that. When reading the sentence, having the qualifier "d= ynamically" after stresses it. I hope you agree. De : 6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] De la part de Thomas Watteyne Envoy=E9 : jeudi 1 ao=FBt 2013 15:13 =C0 : 6TSCH; Ted Lemon (ted.lemon@nominum.com= ); Adrian Farrel (adrian@olddog.co.uk); Marc Bl= anchet Objet : [6tsch] updated charter per BoF suggestion: thoughts? All, Thanks to all for for the effort of putting together the BoF on Tuesday! On= e of the suggestions was to simplify the charter, in particular by reducing= the number of work items. After discussion and suggestions from numerous 6TSCH and other people here = at the IETF, the chairs have created a new, simplified version of the draft= , which we have uploaded in the repo at: https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6tsc= h-00.txt This e-mail is to start a discussion on the ML about this revamped charter.= Please send comments directly to this thread. Ideally, we would like to co= nverge within a couple of days, so let's start the discussion right now. Pascal & Thomas ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_8F1D83ADCC1AC94186A867BEE9B7D91306D7F2C5PEXCVZYM13corpo_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello Thom= as, Pascal,

 = ;

Thanks for= your detailed answers to my questions and comments.

This new c= harter addresses them all.
I support it.

Cheers,=

 <= /p>

Dominique

 <= /p>

De : 6tsc= h-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de Thomas Watteyne
Envoy=E9 : vendredi 2 ao=FBt 2013 16:52
=C0 : 6TSCH
Objet : Re: [6tsch] updated charter per BoF suggestion: thought= s?

 

All,

 

We have slighted refined the la= nguage of the proposed charter following the discussions in this thread. We= feel the text is now ready, please let us know in the next 48h is you noti= ce a major issue with the finalized text.

 

The URL of the latest version h= as not changed, you can find it at:

 

Pascal & Thomas<= /span>

 

=  

On Fri, Aug 2, 2013 at 4:47 PM,= Thomas Watteyne <watteyne@eecs.berkeley.edu= > wrote:

Dominique,

Great comments, thanks a millio= n! Please see the answers inline.

Thomas

 

On Thu, Aug 1, 2013 at 7:01 PM,= <dominique.barthel@orange.com> wrote:

Woww, now this is very focused= . This should give us a clear framework to start our work, and hopefully ex= pand later.

Overall, I believe the current= Work Items description could elaborate a bit more.

Specifically, please find belo= w my questions, followed by other minor remarks/suggested changes.

 

Dominique

 

---------

 

Questions

=AB Produce "Timeslo= t Management Methods and Formats" to describe how an entity can manage= the TSCH schedule on a 6TSCH node”. The schedule is somewhere descri= bed as being static. In this sentence, the schedule can be “managed̶= 1; by an “entity”. What prevents the so-called entity to “= ;manage” the schedule, i.e. allocate slots, based on some information= such as traffic requirements? In which case, what does “static”= ; mean? Probably “imposed upon the 6top layer” (if such notion still e= xists) by some external mechanism.

 

I believe we are perfectly in s= ync. Work item 1 is about the bits-and-bytes to describe the schedule and t= imeslot information. I makes no assumption on when/how it will be used. As = you point out, it can be used (1) in the static schedule case to learn about the health of the network, and (2)= to manage the schedule at run-time from an external entity such as a PCE. = This second point is out of scope for the moment.

 

 “or learnt by a no= de when joining the network, possibly in a format as defined by work item 1= .”

Do you mean the description of= the schedule would be provided “in-band” to the joining node (= through EB’s or similar mechanism). This does not seem to fit the des= cription of work item 1, where the “entity” is an upper layer. Or do yo= u mean as a payload transported on a default cell/link between upper layer = entities ?

 

The latter is absolutely possib= le, as detailed in htt= p://www.ietf.org/mail-archive/web/6tsch/current/msg00973.html.

 

“3. Produce "6TSCH = architecture" to describe the design and implementation of 6TSCH netwo= rks. This document will highlight the different architectural blocks and signaling flows, including the operation of the network in the presence of= multiple BBRs.”

Does this include any form of = multi-hop ND? In light of the discussion at 6lo BoF on this topic, how will= compare to 6lowpan-ND?

We want the architecture to des= cribe all the contextual information for the reader to get the whole pictur= e, in order to this document to be a good entrypoint into t e work at 6TSCH= . It will therefore describe the IPv6 stack and the backbone operation, but the focus will largely be on RPL ope= ration over TSCH networks.

 Sentences unclear to me<= /span>

“A dynamic schedule for = traffic that is switched at the timeslot level may for example be computed = centrally by an entity located on the backbone.”  This sentence is complex and unclear to me overall. Consider rephrasing?

Good catch, we reworded the sen= tence to:

For example, an entity located on the backbone can be centra= lly compute a dynamic schedule for traffic to be switched by the timeslot s= ublayer.

This does not change the meanin= g of the sentence.

“Produce "Timeslot = Management Methods and Formats" to describe how an entity can manage t= he TSCH schedule on a 6TSCH node”. Is it assumed that everybody knows= what “entity” is supposed to mean in this context?

I believe that there are severa= l types of entities that may benefit from this format, so we'd like to stay= agnostic to the exact nature of the entity in the charter language. This i= s discuss in http://ww= w.ietf.org/mail-archive/web/6tsch/current/msg00973.html and = http://www.ietf.org/mail-archive/web/6tsch/current/msg00975.html= .

 Minor changes

s/in front of interference/in = front of narrow-band interference

Done, thanks!=

s/- implementers guide, collec= ting/ - implementers guide: this= document will collect/

 

Done, thanks! <= /span>

s/- coexistence guide, providi= ng/- coexistence guide: this document will provide/

Done, thanks! <= /span>

 English writing

s/and ISA100.11a, and/and ISA1= 00.11a, while/

Done, thanks! <= /span>

s/Initially the document/Initi= ally, the document

Done, thanks! <= /span>

s/be adapted dynamically/be dy= namically adapted/

I'm not sure about that. When r= eading the sentence, having the qualifier "dynamically" after str= esses it. I hope you agree.

De : 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org<= span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Tahoma"= ;,"sans-serif"">] De la part de Thomas Watteyne
Envoy=E9 : jeudi 1 ao=FBt 2013 15:13
=C0 : 6TSCH; Ted Lemon (ted.lemon@nomin= um.com); Adrian Farrel (adrian@olddog.co.uk= ); Marc Blanchet
Objet : [6tsch] updated charter per BoF suggestion: thoughts?

 

All,

 

Thanks to all for for the effort of putting togethe= r the BoF on Tuesday! One of the suggestions was to simplify the charter, i= n particular by reducing the number of work items.

 

After discussion and suggestions from numerous 6TSC= H and other people here at the IETF, the chairs have created a new, simplif= ied version of the draft, which we have uploaded in the repo at:=

 

This e-mail is to start a discussion on the ML abou= t this revamped charter. Please send comments directly to this thread. Idea= lly, we would like to converge within a couple of days, so let's start the = discussion right now.

 

Pascal & Thomas

______________________________________________________________________=
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--_000_8F1D83ADCC1AC94186A867BEE9B7D91306D7F2C5PEXCVZYM13corpo_-- From pthubert@cisco.com Sun Aug 4 10:14:47 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 14E7821F8F07 for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 10:14:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.546 X-Spam-Level: X-Spam-Status: No, score=-10.546 tagged_above=-999 required=5 tests=[AWL=0.052, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id l0a5wCn-4Sw3 for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 10:14:42 -0700 (PDT) Received: from rcdn-iport-9.cisco.com (rcdn-iport-9.cisco.com [173.37.86.80]) by ietfa.amsl.com (Postfix) with ESMTP id 080B621F8425 for <6tsch@ietf.org>; Sun, 4 Aug 2013 10:14:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=6325; q=dns/txt; s=iport; t=1375636482; x=1376846082; h=from:to:cc:subject:date:message-id:mime-version; bh=ijjVjW+Phtcxv8/ZSPYs1/mhCn4LShuNdM7+17iqldU=; b=Cjrle0iZSr6pM3oesp5jWw8W40iFk07z8dwU5NTMsMTdrudBZO17r01R ChKorpbynHslKiO6A21xAbjc7T7BNVIaBk/0pPNuYBD29NcRKhLjr9qdQ YhUZeFlAmRng4l4MyglIGhKMHyw0gv7Xf4lgen5IjNMXPMldWBE8Eai5K Q=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AkEFAG+L/lGtJXG//2dsb2JhbABagkJENVC/FYEZFnSCJgEBAy1MEgEqViYBBA4NiAgMtS4EjUCCKC0EgyB0A4VEo2uDF4Iq X-IronPort-AV: E=Sophos;i="4.89,813,1367971200"; d="scan'208,217";a="240304668" Received: from rcdn-core2-4.cisco.com ([173.37.113.191]) by rcdn-iport-9.cisco.com with ESMTP; 04 Aug 2013 17:14:41 +0000 Received: from xhc-rcd-x08.cisco.com (xhc-rcd-x08.cisco.com [173.37.183.82]) by rcdn-core2-4.cisco.com (8.14.5/8.14.5) with ESMTP id r74HEecx000438 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Sun, 4 Aug 2013 17:14:40 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.107]) by xhc-rcd-x08.cisco.com ([173.37.183.82]) with mapi id 14.02.0318.004; Sun, 4 Aug 2013 12:14:40 -0500 From: "Pascal Thubert (pthubert)" To: 6TSCH <6tsch@ietf.org> Thread-Topic: Finalized charter Thread-Index: Ac6RNe1976nesBtqRTKyV/rotpybPg== Date: Sun, 4 Aug 2013 17:14:39 +0000 Deferred-Delivery: Sun, 4 Aug 2013 17:14:00 +0000 Message-ID: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.193.140] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD8413D32E4xmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: Marc Blanchet , "Erik Nordmark \(nordmark\)" , "Ted Lemon \(ted.lemon@nominum.com\)" , "Adrian Farrel \(adrian@olddog.co.uk\)" Subject: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 17:14:47 -0000 --_000_E045AECD98228444A58C61C200AE1BD8413D32E4xmbrcdx01ciscoc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear all: We now have a clear consensus on the ML for the new charter text. We'll be = proposing this text to Ted to request the formation of a 6TSCH WG. Please find the final version in the repo at: https://bitbucket.org/6tsch/c= harter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt Thanks a bunch for the hard work and the focus on this work! Thomas & Pascal --_000_E045AECD98228444A58C61C200AE1BD8413D32E4xmbrcdx01ciscoc_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear all:

 <= /p>

We now have a clear conse= nsus on the ML for the new charter text. We‘ll be proposing this text= to Ted to request the formation of a 6TSCH WG.

Please find the final ver= sion in the repo at: https://bitbucket.org/6tsch/charte= r-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt

 <= /p>

Thanks a bunch for the ha= rd work and the focus on this work!

 <= /p>

Thomas & Pascal

--_000_E045AECD98228444A58C61C200AE1BD8413D32E4xmbrcdx01ciscoc_-- From marc.blanchet@viagenie.ca Sun Aug 4 10:25:24 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CA36421F866E for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 10:25:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.58 X-Spam-Level: X-Spam-Status: No, score=-102.58 tagged_above=-999 required=5 tests=[AWL=0.018, BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L1uq9XbhTirZ for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 10:25:24 -0700 (PDT) Received: from jazz.viagenie.ca (jazz.viagenie.ca [IPv6:2620:0:230:8000::2]) by ietfa.amsl.com (Postfix) with ESMTP id E566E21F9D2C for <6tsch@ietf.org>; Sun, 4 Aug 2013 10:25:20 -0700 (PDT) Received: from h195.viagenie.ca (h195.viagenie.ca [206.123.31.195]) by jazz.viagenie.ca (Postfix) with ESMTPSA id 55C01403D1; Sun, 4 Aug 2013 13:25:20 -0400 (EDT) Content-Type: multipart/alternative; boundary="Apple-Mail=_12C9D03E-9DE9-42EA-ACC5-83A3FB03F177" Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) From: Marc Blanchet In-Reply-To: Date: Sun, 4 Aug 2013 13:25:19 -0400 Message-Id: References: To: "Pascal Thubert (pthubert)" X-Mailer: Apple Mail (2.1508) Cc: "Erik Nordmark \(nordmark\)" , "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 17:25:24 -0000 --Apple-Mail=_12C9D03E-9DE9-42EA-ACC5-83A3FB03F177 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Le 2013-08-04 =E0 13:14, "Pascal Thubert (pthubert)" = a =E9crit : > Dear all: > =20 > We now have a clear consensus on the ML for the new charter text. = We=91ll be proposing this text to Ted to request the formation of a = 6TSCH WG. > Please find the final version in the repo at: = https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6ts= ch-00.txt I have followed the charter discussion on the mailing list and I support = this version. Marc. > =20 > Thanks a bunch for the hard work and the focus on this work! > =20 > Thomas & Pascal --Apple-Mail=_12C9D03E-9DE9-42EA-ACC5-83A3FB03F177 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252
Le 2013-08-04 =E0 = 13:14, "Pascal Thubert (pthubert)" <pthubert@cisco.com> a =E9crit = :

 
We now have a clear consensus on the ML for = the new charter text. We=91ll be proposing this text to Ted to request = the formation of a 6TSCH WG.
Please find the final version in = the repo at: 
 
Thanks a bunch for the = hard work and the focus on this = work!
<= br>= --Apple-Mail=_12C9D03E-9DE9-42EA-ACC5-83A3FB03F177-- From marc.blanchet@viagenie.ca Sun Aug 4 10:29:25 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4734721F866E for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 10:29:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ynslAQpRM94T for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 10:29:24 -0700 (PDT) Received: from jazz.viagenie.ca (jazz.viagenie.ca [IPv6:2620:0:230:8000::2]) by ietfa.amsl.com (Postfix) with ESMTP id 943E621F8526 for <6tsch@ietf.org>; Sun, 4 Aug 2013 10:29:24 -0700 (PDT) Received: from [IPv6:2620:0:230:2001::1001] (unknown [IPv6:2620:0:230:2001::1001]) by jazz.viagenie.ca (Postfix) with ESMTPSA id 08E6D403D1; Sun, 4 Aug 2013 13:29:24 -0400 (EDT) Content-Type: multipart/alternative; boundary="Apple-Mail=_E9D45E9E-D04A-4CE5-AE20-873EB2213C28" Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) From: Marc Blanchet In-Reply-To: Date: Sun, 4 Aug 2013 13:29:23 -0400 Message-Id: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> References: To: "Pascal Thubert (pthubert)" X-Mailer: Apple Mail (2.1508) Cc: "Erik Nordmark \(nordmark\)" , "Adrian Farrel \(adrian@olddog.co.uk\)" , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 17:29:25 -0000 --Apple-Mail=_E9D45E9E-D04A-4CE5-AE20-873EB2213C28 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 minor comment (please throw it away if people don't agree): I (and = others I think) just have problems pronounciating the wg-to-be keyword = (6tsch). This is obviously not the important part of this, but you might = want to think about it before it is too late, because it will stick = "forever". (and I would suggest not spend much time on this comment)... marc. Le 2013-08-04 =E0 13:25, Marc Blanchet a = =E9crit : > Le 2013-08-04 =E0 13:14, "Pascal Thubert (pthubert)" = a =E9crit : >=20 >> Dear all: >> =20 >> We now have a clear consensus on the ML for the new charter text. = We=91ll be proposing this text to Ted to request the formation of a = 6TSCH WG. >> Please find the final version in the repo at: = https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter-ietf-6ts= ch-00.txt >=20 > I have followed the charter discussion on the mailing list and I = support this version. >=20 > Marc. >=20 >> =20 >> Thanks a bunch for the hard work and the focus on this work! >> =20 >> Thomas & Pascal >=20 --Apple-Mail=_E9D45E9E-D04A-4CE5-AE20-873EB2213C28 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 minor = comment (please throw it away if people don't agree): I (and others I = think) just have problems pronounciating the wg-to-be keyword (6tsch). = This is obviously not the important part of this, but you might want to = think about it before it is too late, because it will stick "forever". = (and I would suggest not spend much time on this = comment)...

marc.


Le 2013-08-04 =E0 = 13:14, "Pascal Thubert (pthubert)" <pthubert@cisco.com> a =E9crit = :

 
We now have a clear consensus on the ML for = the new charter text. We=91ll be proposing this text to Ted to request = the formation of a 6TSCH WG.
Please find the final version in = the repo at: 
 
Thanks a bunch for the = hard work and the focus on this = work!
<= br>

= --Apple-Mail=_E9D45E9E-D04A-4CE5-AE20-873EB2213C28-- From Ted.Lemon@nominum.com Sun Aug 4 11:04:23 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D5F4C21F9D21 for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 11:04:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.557 X-Spam-Level: X-Spam-Status: No, score=-106.557 tagged_above=-999 required=5 tests=[AWL=0.042, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XBkeZWB00m-L for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 11:04:17 -0700 (PDT) Received: from exprod7og107.obsmtp.com (exprod7og107.obsmtp.com [64.18.2.167]) by ietfa.amsl.com (Postfix) with ESMTP id 29C4721F866E for <6tsch@ietf.org>; Sun, 4 Aug 2013 11:04:17 -0700 (PDT) Received: from shell-too.nominum.com ([64.89.228.229]) (using TLSv1) by exprod7ob107.postini.com ([64.18.6.12]) with SMTP ID DSNKUf6Xn6Uo5HN52QKJlaDamv61VEbu6JCB@postini.com; Sun, 04 Aug 2013 11:04:17 PDT Received: from archivist.nominum.com (archivist.nominum.com [64.89.228.108]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "*.nominum.com", Issuer "Go Daddy Secure Certification Authority" (verified OK)) by shell-too.nominum.com (Postfix) with ESMTP id C1AE11B8225 for <6tsch@ietf.org>; Sun, 4 Aug 2013 11:04:15 -0700 (PDT) Received: from webmail.nominum.com (cas-01.win.nominum.com [64.89.228.131]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "mail.nominum.com", Issuer "Go Daddy Secure Certification Authority" (verified OK)) by archivist.nominum.com (Postfix) with ESMTPS id 75A24190060; Sun, 4 Aug 2013 11:04:14 -0700 (PDT) (envelope-from Ted.Lemon@nominum.com) Received: from MBX-01.WIN.NOMINUM.COM ([64.89.228.133]) by CAS-01.WIN.NOMINUM.COM ([64.89.228.131]) with mapi id 14.02.0318.004; Sun, 4 Aug 2013 11:04:14 -0700 From: Ted Lemon To: Marc Blanchet Thread-Topic: Finalized charter Thread-Index: Ac6RNe1976nesBtqRTKyV/rotpybPgAPFZOAAAAkXIAAATdvgA== Date: Sun, 4 Aug 2013 18:04:13 +0000 Message-ID: <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> In-Reply-To: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.1.10] Content-Type: text/plain; charset="Windows-1252" Content-ID: <89EE9D50C81D114890DF78AD0A1F0C49@nominum.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: "Erik Nordmark \(nordmark\)" , "Adrian Farrel \(adrian@olddog.co.uk\)" , "Pascal Thubert \(pthubert\)" , 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 18:04:23 -0000 On Aug 4, 2013, at 1:29 PM, Marc Blanchet wrote= : > minor comment (please throw it away if people don't agree): I (and others= I think) just have problems pronounciating the wg-to-be keyword (6tsch). T= his is obviously not the important part of this, but you might want to thin= k about it before it is too late, because it will stick "forever". (and I w= ould suggest not spend much time on this comment)... I would put this a little more strongly. The normal pronunciation of this= acronym at least in German is just asking for trouble, and I think the bet= ter part of valor is to choose a different acronym. I took some flak at i= n the post-meeting wrapup because of this, and I wouldn't want anyone else = to have to face that. How about 6chants (IPv6 over Channel Hopping ANd Time Sliced links)? From jvasseur@cisco.com Sun Aug 4 11:21:06 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DFDD121F9E1E for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 11:20:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XNnFV9lcPy5V for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 11:20:52 -0700 (PDT) Received: from rcdn-iport-4.cisco.com (rcdn-iport-4.cisco.com [173.37.86.75]) by ietfa.amsl.com (Postfix) with ESMTP id 0A24C21F9E1A for <6tsch@ietf.org>; Sun, 4 Aug 2013 11:20:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=8331; q=dns/txt; s=iport; t=1375640447; x=1376850047; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=WlHa+VHUvuSG/hYntRkGi0YkbtBN1WSc32O7ScWJhyQ=; b=RRYkrEU4t+TLeKOA07J5D9Z8CL95ZjZlEI2paw2htDm/wBxcxgFAYGtP qzVh/ziT1DDtt5nWFl8oIq4my9koilztR5Achs58YNeqMPcy98Y8uC9W3 yUqw3QVq2MVVCLE3DblA7C/1TkNJlPTgS4S1NxEhmazz2T/btYBDKPtVt o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AkMFACqa/lGtJV2a/2dsb2JhbABagkJENUQMvxWBGRZ0giUBAQEDAQEBawsQAgEIIh0HJwsUEQIEDgUIiAgMtSOPaC0EBwmDEHQDhUSTRpAlgxeCKg X-IronPort-AV: E=Sophos;i="4.89,813,1367971200"; d="scan'208,217";a="243406584" Received: from rcdn-core-3.cisco.com ([173.37.93.154]) by rcdn-iport-4.cisco.com with ESMTP; 04 Aug 2013 18:20:46 +0000 Received: from xhc-rcd-x10.cisco.com (xhc-rcd-x10.cisco.com [173.37.183.84]) by rcdn-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id r74IKk2e028005 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Sun, 4 Aug 2013 18:20:46 GMT Received: from xmb-rcd-x02.cisco.com ([169.254.4.27]) by xhc-rcd-x10.cisco.com ([173.37.183.84]) with mapi id 14.02.0318.004; Sun, 4 Aug 2013 13:20:45 -0500 From: "JP Vasseur (jvasseur)" To: "Pascal Thubert (pthubert)" Thread-Topic: [6tsch] Finalized charter Thread-Index: AQHOkT9VOuiJTa5THkWLQbFuOEtRIw== Date: Sun, 4 Aug 2013 18:20:45 +0000 Message-ID: <03B78081B371D44390ED6E7BADBB4A77236AEAEF@xmb-rcd-x02.cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.21.114.99] Content-Type: multipart/alternative; boundary="_000_03B78081B371D44390ED6E7BADBB4A77236AEAEFxmbrcdx02ciscoc_" MIME-Version: 1.0 Cc: Marc Blanchet , 6TSCH <6tsch@ietf.org>, "Adrian Farrel \(adrian@olddog.co.uk\)" , "Erik Nordmark \(nordmark\)" , "Ted Lemon \(ted.lemon@nominum.com\)" Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 18:21:06 -0000 --_000_03B78081B371D44390ED6E7BADBB4A77236AEAEFxmbrcdx02ciscoc_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Pascal and all, I think that the charter an excellent and I strongly support it ! I have two minor comments though: The Working Group will focus on enabling IPv6 over the TSCH mode of the IEEE802.15.4e standard. The scope of the WG includes one or more LLNs, each= one connected to a backbone through one or more BackBone Routers (BBRs). JP> Very minor comment ... replace BBR by LBR and we will be using the same= terminology than ROLL. The WG will interface with other IETF WGs, potentially including ROLL, 6Lo, CoRE, 6MAN, LWIG, and other appropriate groups in the IETF Internet, Routin= g and Security areas. JP> I would make the following changes: The WG will interface with other IETF WGs, including ROLL, 6Lo, PCE CoRE, 6MAN, LWIG, and other appropriate groups in the IETF Internet, Routin= g and Security areas. Thanks ! JP. On Aug 4, 2013, at 10:14 AM, Pascal Thubert (pthubert) > wrote: Dear all: We now have a clear consensus on the ML for the new charter text. We=91ll b= e proposing this text to Ted to request the formation of a 6TSCH WG. Please find the final version in the repo at: https://bitbucket.org/6tsch/c= harter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt Thanks a bunch for the hard work and the focus on this work! Thomas & Pascal _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_03B78081B371D44390ED6E7BADBB4A77236AEAEFxmbrcdx02ciscoc_ Content-Type: text/html; charset="Windows-1252" Content-ID: <44992E5061FE184D9533E112F957E908@emea.cisco.com> Content-Transfer-Encoding: quoted-printable Hi Pascal and all,

I think that the charter an excellent and I strongly support it !

I have two minor comments though:

The Working Group will focus on enabl=
ing IPv6 over the TSCH mode of the
IEEE802.15.4e st=
andard. The scope of the WG includes one or more LLNs, each one
connected to a b=
ackbone through one or more BackBone Routers (BBRs).

JP> Very minor comment ... replace BBR by LBR and we will be using = the same terminology than ROLL.

The WG will interface with other IETF WGs, potentially including ROLL,=
 6Lo,
CoRE, 6MAN, LWIG=
, and other appropriate groups in the IETF Internet, Routing
and Security are=
as.

JP> I would make the following changes:

The WG will interface with other IETF=
 WGs, including ROLL, 6Lo, PCE
CoRE, 6MAN, LWIG=
, and other appropriate groups in the IETF Internet, Routing
and Security are=
as.

Thanks !

JP.


--_000_03B78081B371D44390ED6E7BADBB4A77236AEAEFxmbrcdx02ciscoc_-- From pieter@demil.be Sun Aug 4 11:41:05 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2FEFB21F8426 for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 11:41:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.203 X-Spam-Level: X-Spam-Status: No, score=-5.203 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sUr-4JOHKV4K for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 11:41:00 -0700 (PDT) Received: from smtp2.ugent.be (smtp2.ugent.be [157.193.49.126]) by ietfa.amsl.com (Postfix) with ESMTP id 0C83421F9E6B for <6tsch@ietf.org>; Sun, 4 Aug 2013 11:40:56 -0700 (PDT) Received: from localhost (mcheck2.ugent.be [157.193.49.249]) by smtp2.ugent.be (Postfix) with ESMTP id 12B1012C297; Sun, 4 Aug 2013 20:40:54 +0200 (CEST) X-Virus-Scanned: by UGent DICT Received: from smtp2.ugent.be ([157.193.49.126]) by localhost (mcheck2.UGent.be [157.193.43.11]) (amavisd-new, port 10024) with ESMTP id ig1ryt0RS-Y0; Sun, 4 Aug 2013 20:40:53 +0200 (CEST) Received: from [37.184.83.164] (unknown [37.184.83.164]) (Authenticated sender: pdemil) by smtp2.ugent.be (Postfix) with ESMTPSA id 5CDB212C28C; Sun, 4 Aug 2013 20:40:53 +0200 (CEST) References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> Mime-Version: 1.0 (1.0) In-Reply-To: <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: X-Mailer: iPhone Mail (10B143) From: Pieter De Mil Date: Sun, 4 Aug 2013 20:40:52 +0200 To: Ted Lemon X-Miltered: at jchkm1 with ID 51FEA035.000 by Joe's j-chkmail (http://helpdesk.ugent.be/email/)! X-j-chkmail-Enveloppe: 51FEA035.000 from unknown/unknown/37.184.83.164/[37.184.83.164]/ X-j-chkmail-Score: MSGID : 51FEA035.000 on smtp2.ugent.be : j-chkmail score : . : R=. U=. O=. B=0.000 -> S=0.000 X-j-chkmail-Status: Ham Cc: 6TSCH <6tsch@ietf.org>, Marc Blanchet , "Erik Nordmark \(nordmark\)" , "Pascal Thubert \(pthubert\)" , "Adrian Farrel \(adrian@olddog.co.uk\)" Subject: [6tsch] New name X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 18:41:05 -0000 I don't have a problem with 6tsch, but what about: IPv6 over Time-slotted Channel hopping Slots 6TiCS Think about a ticking clock. Best, Pieter Op 4-aug.-2013 om 20:04 heeft Ted Lemon het volgende= geschreven: > On Aug 4, 2013, at 1:29 PM, Marc Blanchet wrot= e: >> minor comment (please throw it away if people don't agree): I (and others= I think) just have problems pronounciating the wg-to-be keyword (6tsch). Th= is is obviously not the important part of this, but you might want to think a= bout it before it is too late, because it will stick "forever". (and I would= suggest not spend much time on this comment)... >=20 > I would put this a little more strongly. The normal pronunciation of thi= s acronym at least in German is just asking for trouble, and I think the bet= ter part of valor is to choose a different acronym. I took some flak at in= the post-meeting wrapup because of this, and I wouldn't want anyone else to= have to face that. >=20 > How about 6chants (IPv6 over Channel Hopping ANd Time Sliced links)? >=20 > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch From marc.blanchet@viagenie.ca Sun Aug 4 11:49:08 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A917A21F98AD for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 11:49:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.581 X-Spam-Level: X-Spam-Status: No, score=-102.581 tagged_above=-999 required=5 tests=[AWL=0.018, BAYES_00=-2.599, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dub-FulTv5HS for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 11:49:08 -0700 (PDT) Received: from jazz.viagenie.ca (jazz.viagenie.ca [IPv6:2620:0:230:8000::2]) by ietfa.amsl.com (Postfix) with ESMTP id 002CB21F9B38 for <6tsch@ietf.org>; Sun, 4 Aug 2013 11:49:07 -0700 (PDT) Received: from h195.viagenie.ca (h195.viagenie.ca [206.123.31.195]) by jazz.viagenie.ca (Postfix) with ESMTPSA id 317F4403D0; Sun, 4 Aug 2013 14:49:07 -0400 (EDT) Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) From: Marc Blanchet In-Reply-To: Date: Sun, 4 Aug 2013 14:49:06 -0400 Content-Transfer-Encoding: quoted-printable Message-Id: <9E5BF8DD-C07D-43A6-B017-5753A5CC3F3E@viagenie.ca> References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> To: Pieter De Mil X-Mailer: Apple Mail (2.1508) Cc: 6TSCH <6tsch@ietf.org>, "Adrian Farrel \(adrian@olddog.co.uk\)" , "Erik Nordmark \(nordmark\)" , "Pascal Thubert \(pthubert\)" , Ted Lemon Subject: Re: [6tsch] New name X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 18:49:08 -0000 Le 2013-08-04 =E0 14:40, Pieter De Mil a =E9crit : > I don't have a problem with 6tsch, but what about: >=20 > IPv6 over Time-slotted Channel hopping Slots >=20 > 6TiCS >=20 > Think about a ticking clock. +1. (it sounds also like "sixties" which makes an interesting = side-effect... can see all the proponents coming to the meeting in = "sixties" clothes... ;-) back to the regular technical channel... Marc. >=20 > Best, > Pieter >=20 >=20 >=20 >=20 >=20 > Op 4-aug.-2013 om 20:04 heeft Ted Lemon het = volgende geschreven: >=20 >> On Aug 4, 2013, at 1:29 PM, Marc Blanchet = wrote: >>> minor comment (please throw it away if people don't agree): I (and = others I think) just have problems pronounciating the wg-to-be keyword = (6tsch). This is obviously not the important part of this, but you might = want to think about it before it is too late, because it will stick = "forever". (and I would suggest not spend much time on this comment)... >>=20 >> I would put this a little more strongly. The normal pronunciation = of this acronym at least in German is just asking for trouble, and I = think the better part of valor is to choose a different acronym. I = took some flak at in the post-meeting wrapup because of this, and I = wouldn't want anyone else to have to face that. >>=20 >> How about 6chants (IPv6 over Channel Hopping ANd Time Sliced links)? >>=20 >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch From pascal.thubert@gmail.com Sun Aug 4 14:04:08 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3515421F9B25 for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 14:04:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.203 X-Spam-Level: X-Spam-Status: No, score=-1.203 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id a3EW-pycSrqh for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 14:04:07 -0700 (PDT) Received: from mail-wi0-x230.google.com (mail-wi0-x230.google.com [IPv6:2a00:1450:400c:c05::230]) by ietfa.amsl.com (Postfix) with ESMTP id 66A5721F9964 for <6tsch@ietf.org>; Sun, 4 Aug 2013 14:04:07 -0700 (PDT) Received: by mail-wi0-f176.google.com with SMTP id f14so831404wiw.9 for <6tsch@ietf.org>; Sun, 04 Aug 2013 14:04:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=references:mime-version:in-reply-to:content-type :content-transfer-encoding:message-id:cc:x-mailer:from:subject:date :to; bh=UTcvO3kcY2a5d/aCO/7bux+2r390JRuRINchXZNpHzg=; b=S/EMXQcshKsLwQdh+jQenKDQ7lRaKKGzdGx0G43z7bC/TuevOBYvWKlqOufMVTAGsn VEhlDayD8gDxvMlvw1BeTk65SmFkrRiIPqAgORzioKsYmUW9k3Kkk+sqWuVJqEDhC54h b17LS86Ls6Miijf3HoF+YGBZCTzX+KT41830BJPzj4dY9OaQDRZPkyNaLBPSkE/TgkvY wHQlHFNY8lGxWHignOAHmt92GgXD/8Ag4goCfnuGMtunhJtjYtxu0pSksH9QslY2pefS BaTcXvCjo6MavOYkeYNsgeNtj2yShdQA/nSnqasYm3m8szU6hP5FE0jGNxBobXIJn9Iy Mm8g== X-Received: by 10.194.243.129 with SMTP id wy1mr10972978wjc.47.1375650246559; Sun, 04 Aug 2013 14:04:06 -0700 (PDT) Received: from [192.168.1.18] (AAnnecy-551-1-355-244.w90-27.abo.wanadoo.fr. [90.27.198.244]) by mx.google.com with ESMTPSA id li9sm17402984wic.2.2013.08.04.14.04.04 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 04 Aug 2013 14:04:05 -0700 (PDT) References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> Mime-Version: 1.0 (1.0) In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Message-Id: <850A9886-9299-4EF1-8C04-CC02E15D2AE9@gmail.com> X-Mailer: iPhone Mail (10B350) From: Pascal Thubert Date: Sun, 4 Aug 2013 23:04:06 +0200 To: Pieter De Mil Cc: "Pascal Thubert \(pthubert\)" , "Erik Nordmark \(nordmark\)" , Marc Blanchet , 6TSCH <6tsch@ietf.org>, Ted Lemon , "Adrian Farrel \(adrian@olddog.co.uk\)" Subject: Re: [6tsch] New name X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 21:04:08 -0000 Neat ... Others please jump in and propose names! There is no real emergency but a little fun will not hurt after the dense we= ek we had with the IETF =F0=9F=98=8A I'll propose WiNOT: Wireless Networks for Operational Technology... Pascal Le 4 ao=C3=BBt 2013 =C3=A0 20:40, Pieter De Mil a =C3=A9cr= it : > I don't have a problem with 6tsch, but what about: >=20 > IPv6 over Time-slotted Channel hopping Slots >=20 > 6TiCS >=20 > Think about a ticking clock. >=20 > Best, > Pieter >=20 >=20 >=20 >=20 >=20 > Op 4-aug.-2013 om 20:04 heeft Ted Lemon het volgen= de geschreven: >=20 >> On Aug 4, 2013, at 1:29 PM, Marc Blanchet wro= te: >>> minor comment (please throw it away if people don't agree): I (and other= s I think) just have problems pronounciating the wg-to-be keyword (6tsch). T= his is obviously not the important part of this, but you might want to think= about it before it is too late, because it will stick "forever". (and I wou= ld suggest not spend much time on this comment)... >>=20 >> I would put this a little more strongly. The normal pronunciation of th= is acronym at least in German is just asking for trouble, and I think the be= tter part of valor is to choose a different acronym. I took some flak at i= n the post-meeting wrapup because of this, and I wouldn't want anyone else t= o have to face that. >>=20 >> How about 6chants (IPv6 over Channel Hopping ANd Time Sliced links)? >>=20 >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch From pascal.thubert@gmail.com Sun Aug 4 14:09:31 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A25521E8093 for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 14:09:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.203 X-Spam-Level: X-Spam-Status: No, score=-1.203 tagged_above=-999 required=5 tests=[AWL=-0.001, BAYES_00=-2.599, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=1.396] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fVKnLdey70y2 for <6tsch@ietfa.amsl.com>; Sun, 4 Aug 2013 14:09:30 -0700 (PDT) Received: from mail-wg0-x231.google.com (mail-wg0-x231.google.com [IPv6:2a00:1450:400c:c00::231]) by ietfa.amsl.com (Postfix) with ESMTP id 158FE21E8095 for <6tsch@ietf.org>; Sun, 4 Aug 2013 14:09:29 -0700 (PDT) Received: by mail-wg0-f49.google.com with SMTP id y10so1839426wgg.4 for <6tsch@ietf.org>; Sun, 04 Aug 2013 14:09:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=references:mime-version:in-reply-to:content-type :content-transfer-encoding:message-id:cc:from:subject:date:to; bh=dv1ZMz+E3UlsRoGdIJ67KZOojh8P5UTc8/yc65JRjL0=; b=fpjzguB8Aw93VpD+/wnnyirriHTBZLqBI08lN3FDKasfuK6Fops3Z1/jxC/+PTvMDC z/hVSAMpGcK/JoNV5n2e1nl/khzJxBwwAoHrobYGRJpdcQtii9h8TpnqAZzy2ql06U5x 9tzxQXc15QsTZfNEGsh2fsgVOSRvaNFOjS4oqvO/Hgm9L2OxDLCbfAaandGLdIXCTjNd XfTljJx2e20u5EKEOEcKRSb/rKiq+QekskdGbrB1wXq/2f1BEBGvETc4TC2ofjgvFNDe /6+pS3zGs5nF52xJ881KWJcD3Fk6l1Op0ZPYigYRUyyWTFVXSHSvRezUIzCi6GKMcx5M smOA== X-Received: by 10.180.211.7 with SMTP id my7mr4702065wic.26.1375650569217; Sun, 04 Aug 2013 14:09:29 -0700 (PDT) Received: from [192.168.1.18] (AAnnecy-551-1-355-244.w90-27.abo.wanadoo.fr. [90.27.198.244]) by mx.google.com with ESMTPSA id j20sm17418575wie.7.2013.08.04.14.09.27 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 04 Aug 2013 14:09:28 -0700 (PDT) References: <03B78081B371D44390ED6E7BADBB4A77236AEAEF@xmb-rcd-x02.cisco.com> Mime-Version: 1.0 (1.0) In-Reply-To: <03B78081B371D44390ED6E7BADBB4A77236AEAEF@xmb-rcd-x02.cisco.com> Content-Type: multipart/alternative; boundary=Apple-Mail-75F135EA-5083-454B-81E5-B8A88F57ED23 Content-Transfer-Encoding: 7bit Message-Id: <22FC2D4A-058B-4AB7-9F3B-C7C8BD7CD4A2@gmail.com> X-Mailer: iPhone Mail (10B350) From: Pascal Thubert Date: Sun, 4 Aug 2013 23:09:28 +0200 To: "JP Vasseur (jvasseur)" Cc: "Pascal Thubert \(pthubert\)" , "Erik Nordmark \(nordmark\)" , Marc Blanchet , 6TSCH <6tsch@ietf.org>, "Ted Lemon \(ted.lemon@nominum.com\)" , "Adrian Farrel \(adrian@olddog.co.uk\)" Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Aug 2013 21:09:31 -0000 --Apple-Mail-75F135EA-5083-454B-81E5-B8A88F57ED23 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Dear JP and all I'm fine with the second change though the actual work with PCE will really h= appen after the recharter. For the BBR, it is actually a functional set that encompasses LBR as well as= other functionalities that we have to debate, in particular some ND proxy a= nd PCE location. We will need to name that set but will that be LBR? Cheers, Pascal Le 4 ao=C3=BBt 2013 =C3=A0 20:20, "JP Vasseur (jvasseur)" a =C3=A9crit : > Hi Pascal and all, >=20 > I think that the charter an excellent and I strongly support it ! >=20 > I have two minor comments though: >=20 > The Working Group will focus on enabling IPv6 over the TSCH mode of the > IEEE802.15.4e standard. The scope of the WG includes one or more LLNs, eac= h one > connected to a backbone through one or more BackBone Routers (BBRs). >=20 > JP> Very minor comment ... replace BBR by LBR and we will be using the sam= e terminology than ROLL. >=20 > The WG will interface with other IETF WGs, potentially including ROLL, 6Lo= , > CoRE, 6MAN, LWIG, and other appropriate groups in the IETF Internet, Routi= ng > and Security areas. >=20 > JP> I would make the following changes: >=20 > The WG will interface with other IETF WGs, including ROLL, 6Lo, PCE > CoRE, 6MAN, LWIG, and other appropriate groups in the IETF Internet, Routi= ng > and Security areas. >=20 > Thanks ! >=20 > JP. >=20 > On Aug 4, 2013, at 10:14 AM, Pascal Thubert (pthubert) wrote: >=20 >> Dear all: >> =20 >> We now have a clear consensus on the ML for the new charter text. We=E2=80= =98ll be proposing this text to Ted to request the formation of a 6TSCH WG. >> Please find the final version in the repo at: https://bitbucket.org/6tsch= /charter-ietf-6tsch/src/master/charter-ietf-6tsch-00.txt >> =20 >> Thanks a bunch for the hard work and the focus on this work! >> =20 >> Thomas & Pascal >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >=20 > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch --Apple-Mail-75F135EA-5083-454B-81E5-B8A88F57ED23 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Dear JP and all

I'm fine with the second change though the actual work with PCE will real= ly happen after the recharter.

For the BBR, it is a= ctually a functional set that encompasses LBR as well as other functionaliti= es that we have to debate, in particular some ND proxy and PCE location. We w= ill need to name that set but will that be LBR?

Che= ers,

Pascal

Le 4 ao=C3=BBt 2013 =C3=A0 20:20, "J= P Vasseur (jvasseur)" <jvasseur@cis= co.com> a =C3=A9crit :

Hi Pascal and all,

I think that the charter an excellent and I strongly support it !
=

I have two minor comments though:

The Working Group will focus on enabling I=
Pv6 over the TSCH mode of the
IEEE802.15.4e sta=
ndard. The scope of the WG includes one or more LLNs, each one
connected to a ba=
ckbone through one or more BackBone Routers (BBRs).

JP> Very minor comment ... replace BBR by LBR and we will be using t= he same terminology than ROLL.

The WG will interface with other IETF WGs, potentially including ROLL, 6Lo,=

CoRE, 6MAN, LWIG,=
 and other appropriate groups in the IETF Internet, Routing
and Security area=
s.

JP> I would make the following changes:

The WG will interface with other IETF WGs,=
 including ROLL, 6Lo, PCE
CoRE, 6MAN, LWIG,=
 and other appropriate groups in the IETF Internet, Routing
and Security area=
s.

Thanks !

JP.

On Aug 4, 2013, at 10:14 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

 
We now have a clear consensus on the ML for the new charter= text. We=E2=80=98ll be proposing this text to Ted to request the formation o= f a 6TSCH WG.
 
Thanks a bunch for the hard work and the focus on this work= !
 
Thomas & Pascal
_______________________________________________
6tsch mailing list
6tsch@ietf.org
https://www.ietf.org/mailman/listinfo/6tsc= h

____________________= ___________________________
6tsch mailing list
6tsch@ietf.org
https://www.ietf.org/mai= lman/listinfo/6tsch
= --Apple-Mail-75F135EA-5083-454B-81E5-B8A88F57ED23-- From cabo@tzi.org Mon Aug 5 01:59:21 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DA2A821F9DBD for <6tsch@ietfa.amsl.com>; Mon, 5 Aug 2013 01:58:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.249 X-Spam-Level: X-Spam-Status: No, score=-106.249 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_DE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yothu5OKxpMR for <6tsch@ietfa.amsl.com>; Mon, 5 Aug 2013 01:58:26 -0700 (PDT) Received: from informatik.uni-bremen.de (mailhost.informatik.uni-bremen.de [IPv6:2001:638:708:30c9::12]) by ietfa.amsl.com (Postfix) with ESMTP id C8C9021F9C6C for <6tsch@ietf.org>; Mon, 5 Aug 2013 01:54:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at informatik.uni-bremen.de Received: from smtp-fb3.informatik.uni-bremen.de (smtp-fb3.informatik.uni-bremen.de [134.102.224.120]) by informatik.uni-bremen.de (8.14.4/8.14.4) with ESMTP id r758sRYh024584; Mon, 5 Aug 2013 10:54:27 +0200 (CEST) Received: from [172.24.101.75] (unknown [193.104.215.11]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp-fb3.informatik.uni-bremen.de (Postfix) with ESMTPSA id 523A18FF; Mon, 5 Aug 2013 10:54:27 +0200 (CEST) Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) Content-Type: text/plain; charset=iso-8859-1 From: Carsten Bormann In-Reply-To: <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> Date: Mon, 5 Aug 2013 10:54:26 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <09CE48E0-35A4-46BA-98F9-9EDD3A1C13D5@tzi.org> References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> To: Ted Lemon X-Mailer: Apple Mail (2.1508) Cc: 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Aug 2013 08:59:30 -0000 On Aug 4, 2013, at 20:04, Ted Lemon wrote: > The normal pronunciation of this acronym at least in German For a German: TSCH =3D Tisch =3D "tish". Add "six" (english pronunciation), and it's "sixtish". Not too hard. On the charter itself: I was rather skeptical about the version we = discussed in Berlin, and I'm now less worried. I don't quite understand the text for work item 1. Why is this about = querying (which I would have expected in a garden variety management = protocol) and not about setting up? Maybe I don't understand the = relationship between 1 and 2. Work item 2: s/hard-coded/pre-configured/? I would probably stick with the "LBR" terminology as others have said. We may need to discuss how the multi-LBR technology in 6TSCH (ND-proxy?) = relates to that potentially addressed by 6Lo. Since I don't think we = will fully understand the relationship before the charters get = finalized, maybe just note that in the charter. (Maybe it is also worth = highlighting any working relationship with ROLL, if that is required. = Is RPL being modified by 6TSCH?) The charter currently does not discuss security or management, and I = would prefer a clear statement whether that is in scope (re management, = see comment about work item 1 above; security for bootstrapping a = network is a complex issue where it would surprise me if people think = this is in scope). Gr=FC=DFe, Carsten From Mehdi.Mani@itron.com Mon Aug 5 07:05:14 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 21E6121F8C65 for <6tsch@ietfa.amsl.com>; Mon, 5 Aug 2013 07:05:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.599 X-Spam-Level: X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SI4s939IA7me for <6tsch@ietfa.amsl.com>; Mon, 5 Aug 2013 07:05:09 -0700 (PDT) Received: from na01-by2-obe.outbound.protection.outlook.com (mail-by2lp0240.outbound.protection.outlook.com [207.46.163.240]) by ietfa.amsl.com (Postfix) with ESMTP id 93A1E21F9B53 for <6tsch@ietf.org>; Mon, 5 Aug 2013 07:05:08 -0700 (PDT) Received: from BL2PR04MB082.namprd04.prod.outlook.com (10.255.231.149) by BL2PR04MB082.namprd04.prod.outlook.com (10.255.231.149) with Microsoft SMTP Server (TLS) id 15.0.731.12; Mon, 5 Aug 2013 14:05:07 +0000 Received: from BL2PR04MB082.namprd04.prod.outlook.com ([169.254.1.21]) by BL2PR04MB082.namprd04.prod.outlook.com ([169.254.1.21]) with mapi id 15.00.0731.000; Mon, 5 Aug 2013 14:05:06 +0000 From: "Mani, Mehdi" To: Pieter De Mil , Ted Lemon Thread-Topic: [6tsch] New name Thread-Index: AQHOkUJQKQFwvs03ZEuQE/zLUoRoWJmGpeVA Date: Mon, 5 Aug 2013 14:05:05 +0000 Message-ID: References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [85.115.60.180] x-forefront-prvs: 0929F1BAED x-forefront-antispam-report: SFV:NSPM; SFS:(189002)(377454003)(24454002)(199002)(13464003)(51704005)(4396001)(80022001)(83072001)(81542001)(65816001)(81342001)(74366001)(19580395003)(74876001)(79102001)(74706001)(80976001)(51856001)(19580405001)(66066001)(49866001)(69226001)(47446002)(76796001)(83322001)(33646001)(56816003)(74316001)(77096001)(16406001)(46102001)(76576001)(50986001)(63696002)(31966008)(74662001)(56776001)(54316002)(47736001)(59766001)(77982001)(19580385001)(53806001)(47976001)(76482001)(74502001)(54356001)(76786001)(24736002); DIR:OUT; SFP:; SCL:1; SRVR:BL2PR04MB082; H:BL2PR04MB082.namprd04.prod.outlook.com; CLIP:85.115.60.180; RD:InfoNoRecords; MX:1; A:1; LANG:en; Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: itron.com Cc: Marc Blanchet , 6TSCH <6tsch@ietf.org>, "Pascal Thubert \(pthubert\)" , "Erik Nordmark \(nordmark\)" , "Adrian Farrel \(adrian@olddog.co.uk\)" Subject: Re: [6tsch] New name X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Aug 2013 14:05:14 -0000 I like this name if the charter becomes consequently broad and addresses Sy= nchronized time-slotted communications instead of being limited to 802.15.4= e. -Mehdi=20 -----Original Message----- From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of P= ieter De Mil Sent: dimanche 4 ao=FBt 2013 20:41 To: Ted Lemon Cc: 6TSCH; Marc Blanchet; Erik Nordmark (nordmark); Pascal Thubert (pthuber= t); Adrian Farrel (adrian@olddog.co.uk) Subject: [6tsch] New name I don't have a problem with 6tsch, but what about: IPv6 over Time-slotted Channel hopping Slots 6TiCS Think about a ticking clock. Best, Pieter Op 4-aug.-2013 om 20:04 heeft Ted Lemon het volgend= e geschreven: > On Aug 4, 2013, at 1:29 PM, Marc Blanchet wro= te: >> minor comment (please throw it away if people don't agree): I (and other= s I think) just have problems pronounciating the wg-to-be keyword (6tsch). = This is obviously not the important part of this, but you might want to thi= nk about it before it is too late, because it will stick "forever". (and I = would suggest not spend much time on this comment)... >=20 > I would put this a little more strongly. The normal pronunciation of th= is acronym at least in German is just asking for trouble, and I think the b= etter part of valor is to choose a different acronym. I took some flak at= in the post-meeting wrapup because of this, and I wouldn't want anyone els= e to have to face that. >=20 > How about 6chants (IPv6 over Channel Hopping ANd Time Sliced links)? >=20 > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch From Mehdi.Mani@itron.com Mon Aug 5 07:08:46 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1DF6421F9C20 for <6tsch@ietfa.amsl.com>; Mon, 5 Aug 2013 07:08:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.599 X-Spam-Level: X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id THcW1-ryodlv for <6tsch@ietfa.amsl.com>; Mon, 5 Aug 2013 07:08:40 -0700 (PDT) Received: from na01-bl2-obe.outbound.protection.outlook.com (mail-bl2lp0208.outbound.protection.outlook.com [207.46.163.208]) by ietfa.amsl.com (Postfix) with ESMTP id 2BC2021F9E21 for <6tsch@ietf.org>; Mon, 5 Aug 2013 07:08:39 -0700 (PDT) Received: from BL2PR04MB082.namprd04.prod.outlook.com (10.255.231.149) by BL2PR04MB081.namprd04.prod.outlook.com (10.255.231.146) with Microsoft SMTP Server (TLS) id 15.0.731.12; Mon, 5 Aug 2013 14:08:28 +0000 Received: from BL2PR04MB082.namprd04.prod.outlook.com ([169.254.1.21]) by BL2PR04MB082.namprd04.prod.outlook.com ([169.254.1.21]) with mapi id 15.00.0731.000; Mon, 5 Aug 2013 14:08:27 +0000 From: "Mani, Mehdi" To: Pascal Thubert , Pieter De Mil Thread-Topic: [6tsch] New name Thread-Index: AQHOkUJQKQFwvs03ZEuQE/zLUoRoWJmFicoAgAEdg0A= Date: Mon, 5 Aug 2013 14:08:27 +0000 Message-ID: References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> <850A9886-9299-4EF1-8C04-CC02E15D2AE9@gmail.com> In-Reply-To: <850A9886-9299-4EF1-8C04-CC02E15D2AE9@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [85.115.60.180] x-forefront-prvs: 0929F1BAED x-forefront-antispam-report: SFV:NSPM; SFS:(189002)(377454003)(24454002)(199002)(13464003)(51704005)(4396001)(66066001)(80022001)(83072001)(65816001)(81542001)(81342001)(74366001)(19580395003)(74876001)(76796001)(80976001)(19580405001)(74316001)(49866001)(69226001)(76576001)(83322001)(79102001)(74502001)(47446002)(74706001)(33646001)(46102001)(77096001)(16406001)(56816003)(51856001)(54316002)(63696002)(53806001)(50986001)(31966008)(74662001)(56776001)(19580385001)(47736001)(59766001)(77982001)(76482001)(54356001)(76786001)(47976001)(24736002); DIR:OUT; SFP:; SCL:1; SRVR:BL2PR04MB081; H:BL2PR04MB082.namprd04.prod.outlook.com; CLIP:85.115.60.180; RD:InfoNoRecords; MX:1; A:1; LANG:en; Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: itron.com Cc: "Pascal Thubert \(pthubert\)" , "Erik Nordmark \(nordmark\)" , Marc Blanchet , 6TSCH <6tsch@ietf.org>, Ted Lemon , "Adrian Farrel \(adrian@olddog.co.uk\)" Subject: Re: [6tsch] New name X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Aug 2013 14:08:46 -0000 SSBzdWdnZXN0IDZ0aXMgPSBUSW1lIHNsb3RlZCBTeW5jaHJvbml6ZWQNCg0KLS0tLS1PcmlnaW5h bCBNZXNzYWdlLS0tLS0NCkZyb206IDZ0c2NoLWJvdW5jZXNAaWV0Zi5vcmcgW21haWx0bzo2dHNj aC1ib3VuY2VzQGlldGYub3JnXSBPbiBCZWhhbGYgT2YgUGFzY2FsIFRodWJlcnQNClNlbnQ6IGRp bWFuY2hlIDQgYW/Du3QgMjAxMyAyMzowNA0KVG86IFBpZXRlciBEZSBNaWwNCkNjOiBQYXNjYWwg VGh1YmVydCAocHRodWJlcnQpOyBFcmlrIE5vcmRtYXJrIChub3JkbWFyayk7IE1hcmMgQmxhbmNo ZXQ7IDZUU0NIOyBUZWQgTGVtb247IEFkcmlhbiBGYXJyZWwgKGFkcmlhbkBvbGRkb2cuY28udWsp DQpTdWJqZWN0OiBSZTogWzZ0c2NoXSBOZXcgbmFtZQ0KDQpOZWF0IC4uLg0KDQpPdGhlcnMgcGxl YXNlIGp1bXAgaW4gYW5kIHByb3Bvc2UgbmFtZXMhDQoNClRoZXJlIGlzIG5vIHJlYWwgZW1lcmdl bmN5IGJ1dCBhIGxpdHRsZSBmdW4gd2lsbCBub3QgaHVydCBhZnRlciB0aGUgZGVuc2Ugd2VlayB3 ZSBoYWQgd2l0aCB0aGUgSUVURiDwn5iKDQoNCkknbGwgcHJvcG9zZSAgV2lOT1Q6IFdpcmVsZXNz IE5ldHdvcmtzIGZvciBPcGVyYXRpb25hbCBUZWNobm9sb2d5Li4uDQpQYXNjYWwNCg0KTGUgNCBh b8O7dCAyMDEzIMOgIDIwOjQwLCBQaWV0ZXIgRGUgTWlsIDxwaWV0ZXJAZGVtaWwuYmU+IGEgw6lj cml0IDoNCg0KPiBJIGRvbid0IGhhdmUgYSBwcm9ibGVtIHdpdGggNnRzY2gsIGJ1dCB3aGF0IGFi b3V0Og0KPiANCj4gSVB2NiBvdmVyIFRpbWUtc2xvdHRlZCBDaGFubmVsIGhvcHBpbmcgU2xvdHMN Cj4gDQo+IDZUaUNTDQo+IA0KPiBUaGluayBhYm91dCBhIHRpY2tpbmcgY2xvY2suDQo+IA0KPiBC ZXN0LA0KPiBQaWV0ZXINCj4gDQo+IA0KPiANCj4gDQo+IA0KPiBPcCA0LWF1Zy4tMjAxMyBvbSAy MDowNCBoZWVmdCBUZWQgTGVtb24gPFRlZC5MZW1vbkBub21pbnVtLmNvbT4gaGV0IHZvbGdlbmRl IGdlc2NocmV2ZW46DQo+IA0KPj4gT24gQXVnIDQsIDIwMTMsIGF0IDE6MjkgUE0sIE1hcmMgQmxh bmNoZXQgPG1hcmMuYmxhbmNoZXRAdmlhZ2VuaWUuY2E+IHdyb3RlOg0KPj4+IG1pbm9yIGNvbW1l bnQgKHBsZWFzZSB0aHJvdyBpdCBhd2F5IGlmIHBlb3BsZSBkb24ndCBhZ3JlZSk6IEkgKGFuZCBv dGhlcnMgSSB0aGluaykganVzdCBoYXZlIHByb2JsZW1zIHByb25vdW5jaWF0aW5nIHRoZSB3Zy10 by1iZSBrZXl3b3JkICg2dHNjaCkuIFRoaXMgaXMgb2J2aW91c2x5IG5vdCB0aGUgaW1wb3J0YW50 IHBhcnQgb2YgdGhpcywgYnV0IHlvdSBtaWdodCB3YW50IHRvIHRoaW5rIGFib3V0IGl0IGJlZm9y ZSBpdCBpcyB0b28gbGF0ZSwgYmVjYXVzZSBpdCB3aWxsIHN0aWNrICJmb3JldmVyIi4gKGFuZCBJ IHdvdWxkIHN1Z2dlc3Qgbm90IHNwZW5kIG11Y2ggdGltZSBvbiB0aGlzIGNvbW1lbnQpLi4uDQo+ PiANCj4+IEkgd291bGQgcHV0IHRoaXMgYSBsaXR0bGUgbW9yZSBzdHJvbmdseS4gICBUaGUgbm9y bWFsIHByb251bmNpYXRpb24gb2YgdGhpcyBhY3JvbnltIGF0IGxlYXN0IGluIEdlcm1hbiBpcyBq dXN0IGFza2luZyBmb3IgdHJvdWJsZSwgYW5kIEkgdGhpbmsgdGhlIGJldHRlciBwYXJ0IG9mIHZh bG9yIGlzIHRvIGNob29zZSBhIGRpZmZlcmVudCBhY3JvbnltLiAgIEkgdG9vayBzb21lIGZsYWsg YXQgaW4gdGhlIHBvc3QtbWVldGluZyB3cmFwdXAgYmVjYXVzZSBvZiB0aGlzLCBhbmQgSSB3b3Vs ZG4ndCB3YW50IGFueW9uZSBlbHNlIHRvIGhhdmUgdG8gZmFjZSB0aGF0Lg0KPj4gDQo+PiBIb3cg YWJvdXQgNmNoYW50cyAoSVB2NiBvdmVyIENoYW5uZWwgSG9wcGluZyBBTmQgVGltZSBTbGljZWQg bGlua3MpPw0KPj4gDQo+PiBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fXw0KPj4gNnRzY2ggbWFpbGluZyBsaXN0DQo+PiA2dHNjaEBpZXRmLm9yZw0KPj4gaHR0 cHM6Ly93d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5mby82dHNjaA0KPiBfX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXw0KPiA2dHNjaCBtYWlsaW5nIGxpc3QN Cj4gNnRzY2hAaWV0Zi5vcmcNCj4gaHR0cHM6Ly93d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5m by82dHNjaA0KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18N CjZ0c2NoIG1haWxpbmcgbGlzdA0KNnRzY2hAaWV0Zi5vcmcNCmh0dHBzOi8vd3d3LmlldGYub3Jn L21haWxtYW4vbGlzdGluZm8vNnRzY2gNCg== From prvs=922dbf3c5=patricia.brett@honeywell.com Mon Aug 5 08:44:43 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4760C21F855F for <6tsch@ietfa.amsl.com>; 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client-ip=10.216.34.43; receiver=de08ip008.honeywell.com; envelope-from="patricia.brett@honeywell.com"; x-sender="postmaster@de08ex5005.global.ds.honeywell.com"; x-conformance=spf_only X-SBRS: None X-SenderGroup: Relay_to_Internet X-MailFlowPolicy: $Relay X-Attachment_Filename: X-Attachment_Filesize: None X-IronPort-AV: E=Sophos;i="4.89,819,1367996400"; d="scan'208";a="23578578" Received: from unknown (HELO de08ex5005.global.ds.honeywell.com) ([10.216.34.43]) by de08ip008.honeywell.com with ESMTP; 05 Aug 2013 08:44:30 -0700 Received: from DE08EX3001.global.ds.honeywell.com ([169.254.1.149]) by de08ex5005.global.ds.honeywell.com ([10.216.14.78]) with mapi id 14.02.0309.002; Mon, 5 Aug 2013 11:44:30 -0400 From: "Brett, Patricia (PA62)" To: "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: [6tsch] New name Thread-Index: AQHOkUIunZdL7Jp/H0K7rjIJDeKr/5mFzNkAgADWW0CAAB+U4A== Date: Mon, 5 Aug 2013 15:44:29 +0000 Message-ID: <861C280A4EB34046A0D9A4324E4E822401311B6B@de08ex3001.global.ds.honeywell.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [164.145.52.191] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Forwarded Cc: "Brett, Patricia \(PA62\)" Subject: [6tsch] FW: New name X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Aug 2013 15:44:43 -0000 Rm9yIHlvdSwgUGFzY2FsOg0KDQpXaXRjaGVzIC0gV2lyZWxlc3MgVGltZSBDaGFubmVsIEhvcHBp bmcgRW1wbG95aW5nIFNsb3RzIA0KKHRoaXMgYWNyb255bSBhbHNvIGluZGljYXRlcyB0aGUgdXNl IG9mIHRlY2huaWNhbCB3aXphcmRyeSkuDQoNClBhdA0KDQotLS0tLU9yaWdpbmFsIE1lc3NhZ2Ut LS0tLQ0KRnJvbTogNnRzY2gtYm91bmNlc0BpZXRmLm9yZyBbbWFpbHRvOjZ0c2NoLWJvdW5jZXNA aWV0Zi5vcmddIE9uIEJlaGFsZiBPZiBQYXNjYWwgVGh1YmVydA0KU2VudDogU3VuZGF5LCBBdWd1 c3QgMDQsIDIwMTMgNTowNCBQTQ0KVG86IFBpZXRlciBEZSBNaWwNCkNjOiBQYXNjYWwgVGh1YmVy dCAocHRodWJlcnQpOyBFcmlrIE5vcmRtYXJrIChub3JkbWFyayk7IE1hcmMgQmxhbmNoZXQ7IDZU U0NIOyBUZWQgTGVtb247IEFkcmlhbiBGYXJyZWwgKGFkcmlhbkBvbGRkb2cuY28udWspDQpTdWJq ZWN0OiBSZTogWzZ0c2NoXSBOZXcgbmFtZQ0KDQpOZWF0IC4uLg0KDQpPdGhlcnMgcGxlYXNlIGp1 bXAgaW4gYW5kIHByb3Bvc2UgbmFtZXMhDQoNClRoZXJlIGlzIG5vIHJlYWwgZW1lcmdlbmN5IGJ1 dCBhIGxpdHRsZSBmdW4gd2lsbCBub3QgaHVydCBhZnRlciB0aGUgZGVuc2Ugd2VlayB3ZSBoYWQg d2l0aCB0aGUgSUVURiDwn5iKDQoNCkknbGwgcHJvcG9zZSAgV2lOT1Q6IFdpcmVsZXNzIE5ldHdv cmtzIGZvciBPcGVyYXRpb25hbCBUZWNobm9sb2d5Li4uDQpQYXNjYWwNCg0KTGUgNCBhb8O7dCAy MDEzIMOgIDIwOjQwLCBQaWV0ZXIgRGUgTWlsIDxwaWV0ZXJAZGVtaWwuYmU+IGEgw6ljcml0IDoN Cg0KPiBJIGRvbid0IGhhdmUgYSBwcm9ibGVtIHdpdGggNnRzY2gsIGJ1dCB3aGF0IGFib3V0Og0K PiANCj4gSVB2NiBvdmVyIFRpbWUtc2xvdHRlZCBDaGFubmVsIGhvcHBpbmcgU2xvdHMNCj4gDQo+ IDZUaUNTDQo+IA0KPiBUaGluayBhYm91dCBhIHRpY2tpbmcgY2xvY2suDQo+IA0KPiBCZXN0LA0K PiBQaWV0ZXINCj4gDQo+IA0KPiANCj4gDQo+IA0KPiBPcCA0LWF1Zy4tMjAxMyBvbSAyMDowNCBo ZWVmdCBUZWQgTGVtb24gPFRlZC5MZW1vbkBub21pbnVtLmNvbT4gaGV0IHZvbGdlbmRlIGdlc2No cmV2ZW46DQo+IA0KPj4gT24gQXVnIDQsIDIwMTMsIGF0IDE6MjkgUE0sIE1hcmMgQmxhbmNoZXQg PG1hcmMuYmxhbmNoZXRAdmlhZ2VuaWUuY2E+IHdyb3RlOg0KPj4+IG1pbm9yIGNvbW1lbnQgKHBs ZWFzZSB0aHJvdyBpdCBhd2F5IGlmIHBlb3BsZSBkb24ndCBhZ3JlZSk6IEkgKGFuZCBvdGhlcnMg SSB0aGluaykganVzdCBoYXZlIHByb2JsZW1zIHByb25vdW5jaWF0aW5nIHRoZSB3Zy10by1iZSBr ZXl3b3JkICg2dHNjaCkuIFRoaXMgaXMgb2J2aW91c2x5IG5vdCB0aGUgaW1wb3J0YW50IHBhcnQg b2YgdGhpcywgYnV0IHlvdSBtaWdodCB3YW50IHRvIHRoaW5rIGFib3V0IGl0IGJlZm9yZSBpdCBp cyB0b28gbGF0ZSwgYmVjYXVzZSBpdCB3aWxsIHN0aWNrICJmb3JldmVyIi4gKGFuZCBJIHdvdWxk IHN1Z2dlc3Qgbm90IHNwZW5kIG11Y2ggdGltZSBvbiB0aGlzIGNvbW1lbnQpLi4uDQo+PiANCj4+ IEkgd291bGQgcHV0IHRoaXMgYSBsaXR0bGUgbW9yZSBzdHJvbmdseS4gICBUaGUgbm9ybWFsIHBy b251bmNpYXRpb24gb2YgdGhpcyBhY3JvbnltIGF0IGxlYXN0IGluIEdlcm1hbiBpcyBqdXN0IGFz a2luZyBmb3IgdHJvdWJsZSwgYW5kIEkgdGhpbmsgdGhlIGJldHRlciBwYXJ0IG9mIHZhbG9yIGlz IHRvIGNob29zZSBhIGRpZmZlcmVudCBhY3JvbnltLiAgIEkgdG9vayBzb21lIGZsYWsgYXQgaW4g dGhlIHBvc3QtbWVldGluZyB3cmFwdXAgYmVjYXVzZSBvZiB0aGlzLCBhbmQgSSB3b3VsZG4ndCB3 YW50IGFueW9uZSBlbHNlIHRvIGhhdmUgdG8gZmFjZSB0aGF0Lg0KPj4gDQo+PiBIb3cgYWJvdXQg NmNoYW50cyAoSVB2NiBvdmVyIENoYW5uZWwgSG9wcGluZyBBTmQgVGltZSBTbGljZWQgbGlua3Mp Pw0KPj4gDQo+PiBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f Xw0KPj4gNnRzY2ggbWFpbGluZyBsaXN0DQo+PiA2dHNjaEBpZXRmLm9yZw0KPj4gaHR0cHM6Ly93 d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5mby82dHNjaA0KPiBfX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fXw0KPiA2dHNjaCBtYWlsaW5nIGxpc3QNCj4gNnRz Y2hAaWV0Zi5vcmcNCj4gaHR0cHM6Ly93d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5mby82dHNj aA0KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18NCjZ0c2No IG1haWxpbmcgbGlzdA0KNnRzY2hAaWV0Zi5vcmcNCmh0dHBzOi8vd3d3LmlldGYub3JnL21haWxt YW4vbGlzdGluZm8vNnRzY2gNCg== From jvasseur@cisco.com Mon Aug 5 17:18:47 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2195321F9DB0 for <6tsch@ietfa.amsl.com>; 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X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgsFAOA/AFKtJXHA/2dsb2JhbABbgwY1UL54gSUWdIIkAQEBAwEBAQFrBAcFCwIBCA4KCiQnCyUCBAENBQiIAgYMtUQEj2QCMQeDGXQDiHKgPYMXgio X-IronPort-AV: E=Sophos;i="4.89,822,1367971200"; d="scan'208";a="243828751" Received: from rcdn-core2-5.cisco.com ([173.37.113.192]) by rcdn-iport-7.cisco.com with ESMTP; 06 Aug 2013 00:18:41 +0000 Received: from xhc-rcd-x05.cisco.com (xhc-rcd-x05.cisco.com [173.37.183.79]) by rcdn-core2-5.cisco.com (8.14.5/8.14.5) with ESMTP id r760IfbD014666 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 6 Aug 2013 00:18:41 GMT Received: from xmb-rcd-x02.cisco.com ([169.254.4.27]) by xhc-rcd-x05.cisco.com ([173.37.183.79]) with mapi id 14.02.0318.004; Mon, 5 Aug 2013 19:18:40 -0500 From: "JP Vasseur (jvasseur)" To: Carsten Bormann , "Pascal Thubert (pthubert)" Thread-Topic: [6tsch] Finalized charter Thread-Index: AQHOkjqAOuiJTa5THkWLQbFuOEtRIw== Date: Tue, 6 Aug 2013 00:18:40 +0000 Message-ID: <03B78081B371D44390ED6E7BADBB4A77236C036B@xmb-rcd-x02.cisco.com> References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> <09CE48E0-35A4-46BA-98F9-9EDD3A1C13D5@tzi.org> In-Reply-To: <09CE48E0-35A4-46BA-98F9-9EDD3A1C13D5@tzi.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.154.200.66] Content-Type: text/plain; charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: 6TSCH <6tsch@ietf.org>, Ted Lemon Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Aug 2013 00:18:47 -0000 Agree with Carsten and Pascal, I would stick to LBR and mention PCE specifi= cally On Aug 5, 2013, at 1:54 AM, Carsten Bormann wrote: > On Aug 4, 2013, at 20:04, Ted Lemon wrote: >=20 >> The normal pronunciation of this acronym at least in German >=20 > For a German: TSCH =3D Tisch =3D "tish". > Add "six" (english pronunciation), and it's "sixtish". > Not too hard. >=20 > On the charter itself: I was rather skeptical about the version we discus= sed in Berlin, and I'm now less worried. >=20 > I don't quite understand the text for work item 1. Why is this about que= rying (which I would have expected in a garden variety management protocol)= and not about setting up? Maybe I don't understand the relationship betwe= en 1 and 2. >=20 > Work item 2: s/hard-coded/pre-configured/? >=20 > I would probably stick with the "LBR" terminology as others have said. >=20 > We may need to discuss how the multi-LBR technology in 6TSCH (ND-proxy?) = relates to that potentially addressed by 6Lo. Since I don't think we will = fully understand the relationship before the charters get finalized, maybe = just note that in the charter. (Maybe it is also worth highlighting any wo= rking relationship with ROLL, if that is required. Is RPL being modified b= y 6TSCH?) >=20 > The charter currently does not discuss security or management, and I woul= d prefer a clear statement whether that is in scope (re management, see com= ment about work item 1 above; security for bootstrapping a network is a com= plex issue where it would surprise me if people think this is in scope). >=20 > Gr=FC=DFe, Carsten >=20 > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch From twatteyne@gmail.com Tue Aug 6 13:08:53 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AD60D21E80AB for <6tsch@ietfa.amsl.com>; Tue, 6 Aug 2013 13:08:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.459 X-Spam-Level: X-Spam-Status: No, score=-1.459 tagged_above=-999 required=5 tests=[AWL=-0.482, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_BACKHAIR_43=1, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PpRJ-+FdqRgN for <6tsch@ietfa.amsl.com>; Tue, 6 Aug 2013 13:08:52 -0700 (PDT) Received: from mail-pd0-x22c.google.com (mail-pd0-x22c.google.com [IPv6:2607:f8b0:400e:c02::22c]) by ietfa.amsl.com (Postfix) with ESMTP id 3DEAB21E80AA for <6tsch@ietf.org>; Tue, 6 Aug 2013 13:08:52 -0700 (PDT) Received: by mail-pd0-f172.google.com with SMTP id z11so627117pdj.3 for <6tsch@ietf.org>; Tue, 06 Aug 2013 13:08:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=jLNiVYhQ0Kz0NpS0Fgd5GUwB8/wZqVLV4D2CWBYwFFk=; b=u9h7u+1WWlrHiyu5TijVRPd4k0AnUMgqhvZnZT7Xfwaakx0/hrW6xF2/TxP8Ncd6ep e8pWdGKDQLH4pL53u+B8PQ1Kon4xNpm0SxX/I7JAyisdnfbZIDGFRpJdqoWHC7KBm2vZ AWW8zgl0mDm1PoqE96hi+2kqlRNpMpLeEYFojdVPkQaw35+QvaPYBIlqeHycH+tjdhOh W3JgNDyurBew/h2+25cSJdtrko0yOxS8+ZmmLBR+mgJHRmsoQyvk13oHqUVvYq5fBqjG cyAOhp8DWEDL/cc0iEYNKZVFnbeA8B+mPNPVNGB/x1tazT+xsp5x23Kk8ALCx3PrKBh4 6dkQ== X-Received: by 10.66.122.99 with SMTP id lr3mr440114pab.187.1375819731783; Tue, 06 Aug 2013 13:08:51 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 6 Aug 2013 13:08:30 -0700 (PDT) In-Reply-To: <03B78081B371D44390ED6E7BADBB4A77236C036B@xmb-rcd-x02.cisco.com> References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> <09CE48E0-35A4-46BA-98F9-9EDD3A1C13D5@tzi.org> <03B78081B371D44390ED6E7BADBB4A77236C036B@xmb-rcd-x02.cisco.com> From: Thomas Watteyne Date: Tue, 6 Aug 2013 13:08:30 -0700 X-Google-Sender-Auth: INvf_Q4t7Oz11QlVvXcRxJUO8Js Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b2e0e8f63559c04e34cfe4e Cc: Ted Lemon Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Aug 2013 20:08:53 -0000 --047d7b2e0e8f63559c04e34cfe4e Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable JP, Carsten, Thanks for the very valuable input on the charter. Let me try to summarize your comments and provide an answer to the issues you raise below. *BBR->LBR* *Suggestion from JP. Changing BBR to LBR would align terminology with the ROLL WG.* For reference, here are the definitions in the latest versions of the drafts: - *LBR* (draft-ietf-roll-terminology-12): Low power and Lossy Network Border Router. The LBR is a device that connects the Low power and Loss= y Network to another routing domain such as a Local Area Network (LAN), Wi= de Area Network (WAN) or the Internet where a possibly different routing protocol is in operation. The LBR acts as a routing device and may possibly host other functions such as data collector or aggregator. - *BBR* (draft-thubert-6lowpan-backbone-router-03): An IPv6 router that federates the LLN using a Backbone link as a backbone. A BBR acts as a 6LoWPAN Border Routers (6LBR) and an Energy Aware Default Router (NEAR). These are indeed very close terms. Whatever the name, I believe we are talking about an entity which plays several roles, including handling downstream routes where applicable (RPL), compacting 6LoWPAN header (6LoWPAN), and federating several LLNs under one prefix (ND). As usual, these functions can be co-located in the same box. While I don't have a strong opinion on this, I tend to agree that LBR is a more established term than BBR, and maybe a bit more generic according to the definitions above. Yet, we have already sent the proposed charter to the ADs for review. What I have done is filing https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/5/bbr-lbr, to keep track of your suggestion. We can integrate it if requested during future discussion about the charter with the IESG. *Add PCE to WG to interact with* *Suggestion from JP. The idea is to list PCE as a WG to interact with.* The reason we did not include it in the text is because the definition of the node<->PCE interaction is not within scope of this charter. Work item 1 covers the format of the payload (e.g. the bits and bytes to describe a cell), but not the exact transport solution or interaction. That being said, this is absolutely what we tend towards, and when we explicitly work on that, we will be interacting with the PCE WG. I understand you are suggesting to list PCE right away. I have filed https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/6/add-pce-to-wg-to-int= eract-with to cover this. *Interaction between Work Item 1 and 2* *Clarifying question from Carsten.* The goal of work item 1 is to describe a format for the PCE to be able to send commands to the nodes, and for the nodes to send statistics and topological information to the PCE. In this version of the charter, we assume that the schedule is static, i.e. we do not address the PCE->nodes traffic yet. That being said, statistics and topological information can flow from node to PCE in a network resulting from work item 2. This for example allows for close monitoring of the health of the network. That being said, the scope of work item 1 is very clear and very "atomic". Management includes setup, update, tear down, as well as getting reports. The scope of work item 1 is not to focus on "network management" as a whole, only to produce formats and methods that can be used by all points of command, including PCE, node configuration, network management, etc. *hard-coded -> pre-configured* *Suggestion from Carsten.* The term "pre-configured" is indeed more elegant than the term "hard-coded". Would you agree, however, that both terms end up expressing the same idea? I have filed https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/7/hard-coded-pre-confi= gured to track and remember this suggestion. Note that there is an intent that we provide a basic schedule that would operate without any configuration. Then through the methods in item 1 we propose to optionally set up an initial schedule that the node will use instead. *changing RPL?* *Clarifying question from Carsten.* The goal of the work at 6TSCH is absolutely not to change RPL, just to describe how RPL can be be used on these time slotted networks. This is probably going to be the biggest piece of the work done in work item 2. What we might do is define some metrics and maybe even an OF, but NOT to request any changes to RPL itself. I would argue that, if the goal were to change RPL, this would appear clearly in the charter text. In the absence of the statement "we want to change RPL", we assume that the reader understands that the goal is to not change RPL. We may study objective functions and new options, in particular to transport a schedule, but we are not chartering to standardize work there. *security in scope?* *Clarifying question from Carsten.* We have had numerous discussion about this last week, including in-person with Yoshihiro, Subir, Rafa, and by e-mail with Rene. I believe we had a very similar discussion with Rene, which you can find at http://www.ietf.org/mail-archive/web/6tsch/current/msg00985.html. Rene agreed with the discussion. In very short, work on security and management is welcome but we do not charter a work item for this round. I hope this answers your questions. Thomas On Mon, Aug 5, 2013 at 5:18 PM, JP Vasseur (jvasseur) w= rote: > Agree with Carsten and Pascal, I would stick to LBR and mention PCE > specifically > > On Aug 5, 2013, at 1:54 AM, Carsten Bormann wrote: > > > On Aug 4, 2013, at 20:04, Ted Lemon wrote: > > > >> The normal pronunciation of this acronym at least in German > > > > For a German: TSCH =3D Tisch =3D "tish". > > Add "six" (english pronunciation), and it's "sixtish". > > Not too hard. > > > > On the charter itself: I was rather skeptical about the version we > discussed in Berlin, and I'm now less worried. > > > > I don't quite understand the text for work item 1. Why is this about > querying (which I would have expected in a garden variety management > protocol) and not about setting up? Maybe I don't understand the > relationship between 1 and 2. > > > > Work item 2: s/hard-coded/pre-configured/? > > > > I would probably stick with the "LBR" terminology as others have said. > > > > We may need to discuss how the multi-LBR technology in 6TSCH (ND-proxy?= ) > relates to that potentially addressed by 6Lo. Since I don't think we wil= l > fully understand the relationship before the charters get finalized, mayb= e > just note that in the charter. (Maybe it is also worth highlighting any > working relationship with ROLL, if that is required. Is RPL being modifi= ed > by 6TSCH?) > > > > The charter currently does not discuss security or management, and I > would prefer a clear statement whether that is in scope (re management, s= ee > comment about work item 1 above; security for bootstrapping a network is = a > complex issue where it would surprise me if people think this is in scope= ). > > > > Gr=FC=DFe, Carsten > > > > _______________________________________________ > > 6tsch mailing list > > 6tsch@ietf.org > > https://www.ietf.org/mailman/listinfo/6tsch > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > --047d7b2e0e8f63559c04e34cfe4e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
JP, Carsten,
<= br style=3D"margin:0px;padding:0px">
Thanks for the ve= ry valuable input on the charter. Let me try to summarize your comments and= provide an answer to the issues you raise below.

BBR->LBR
<= br style=3D"margin:0px;padding:0px">
Suggestion from JP. Changing BBR to LBR would align term= inology with the ROLL WG.

For reference, here are the definitions in the lat= est versions of the drafts:
<= ul class=3D"" style=3D"margin:0px 0px 0px 1.5em;padding:0px">
  • LBR=A0(draft-ietf-roll-terminology-12): Low power and Lossy Ne= twork Border Router.=A0 The LBR is a device that connects the Low power and= Lossy Network to another routing domain such as a Local Area Network (LAN)= , Wide Area Network (WAN) or the Internet where a possibly different routin= g protocol is in operation.=A0 The LBR acts as a routing device and may pos= sibly host other functions such as data collector or aggregator.
      • BBR=A0(draft-thubert-6lowpan-backbone-router-03): An IPv6 rout= er that federates the LLN using a Backbone link as a backbone. A BBR acts a= s a 6LoWPAN Border Routers (6LBR) and an Energy Aware Default Router (NEAR)= .

    These are indeed = very close terms. Whatever the name, I believe we are talking about an enti= ty which plays several roles, including handling downstream routes where ap= plicable (RPL), compacting 6LoWPAN header (6LoWPAN), and federating several= LLNs under one prefix (ND). As usual, these functions can be co-located in= the same box.
    <= br style=3D"margin:0px;padding:0px">
    While I don't= have a strong opinion on this, I tend to agree that LBR is a more establis= hed term than BBR, and maybe a bit more generic according to the definition= s above.
    <= br style=3D"margin:0px;padding:0px">
    Yet, we have alre= ady sent the proposed charter to the ADs for review. What I have done is fi= ling=A0https://bitbucket.org/6tsch/charter-ietf-6tsc= h/issue/5/bbr-lbr, to keep track of your suggestion. We can integrate it if reque= sted during future discussion about the charter with the IESG.
    <= br style=3D"margin:0px;padding:0px">
    Add PCE to WG to int= eract with

    Suggestion fro= m JP. The idea is to list PCE as a WG to interact with.
    <= br style=3D"margin:0px;padding:0px">
    The reason we did= not include it in the text is because the definition of the node<->P= CE interaction is not within scope of this charter. Work item 1 covers the = format of the payload (e.g. the bits and bytes to describe a cell), but not= the exact transport solution or interaction.
    <= br style=3D"margin:0px;padding:0px">
    That being said, = this is absolutely what we tend towards, and when we explicitly work on tha= t, we will be interacting with the PCE WG. I understand you are suggesting = to list PCE right away. I have filed=A0https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/6/add-pce-to= -wg-to-interact-with=A0to cover this.
    <= br style=3D"margin:0px;padding:0px">
    Interaction between = Work Item 1 and 2

    Clarifying que= stion from Carsten.
    <= br style=3D"margin:0px;padding:0px">
    The goal of work = item 1 is to describe a format for the PCE to be able to send commands to t= he nodes, and for the nodes to send statistics and topological information = to the PCE. In this version of the charter, we assume that the schedule is = static, i.e. we do not address the PCE->nodes traffic yet. That being sa= id, statistics and topological information can flow from node to PCE in a n= etwork resulting from work item 2. This for example allows for close monito= ring of the health of the network.
    <= br style=3D"margin:0px;padding:0px">
    That being said, = the scope of work item 1 is very clear and very "atomic". Managem= ent includes setup, update, tear down, as well as getting reports. The scop= e of work item 1 is not to focus on "network management" as a who= le, only to produce formats and methods that can be used by all points of c= ommand, including PCE, node configuration, network management, etc.<= /div>
    <= br style=3D"margin:0px;padding:0px">
    hard-coded -> pre= -configured

    Suggestion fro= m Carsten.
    <= br style=3D"margin:0px;padding:0px">
    The term "pr= e-configured" is indeed more elegant than the term "hard-coded&qu= ot;. Would you agree, however, that both terms end up expressing the same i= dea? I have filed=A0https://bitbuc= ket.org/6tsch/charter-ietf-6tsch/issue/7/hard-coded-pre-configured=A0to track and= remember this suggestion.
    <= br style=3D"margin:0px;padding:0px">
    Note that there i= s an intent that we provide a basic schedule that would operate without any= configuration. Then through the methods in item 1 we propose to optionally= set up an initial schedule that the node will use instead.
    <= br style=3D"margin:0px;padding:0px">
    changing RPL?

    Clarifying que= stion from Carsten.
    <= br style=3D"margin:0px;padding:0px">
    The goal of the w= ork at 6TSCH is absolutely not to change RPL, just to describe how RPL can = be be used on these time slotted networks. This is probably going to be the= biggest piece of the work done in work item 2. What we might do is define = some metrics and maybe even an OF, but NOT to request any changes to RPL it= self.
    <= br style=3D"margin:0px;padding:0px">
    I would argue tha= t, if the goal were to change RPL, this would appear clearly in the charter= text. In the absence of the statement "we want to change RPL", w= e assume that the reader understands that the goal is to not change RPL. We= may study objective functions and new options, in particular to transport = a schedule, but we are not chartering to standardize work there.
    <= br style=3D"margin:0px;padding:0px">
    security in scope?

    Clarifying que= stion from Carsten.
    <= br style=3D"margin:0px;padding:0px">
    We have had numer= ous discussion about this last week, including in-person with Yoshihiro, Su= bir, Rafa, and by e-mail with Rene. I believe we had a very similar discuss= ion with Rene, which you can find at=A0http://www.= ietf.org/mail-archive/web/6tsch/current/msg00985.html. Rene agreed with the discu= ssion.
    <= br style=3D"margin:0px;padding:0px">
    In very short, wo= rk on security and management is welcome but we do not charter a work item = for this round.

    I hope this answers your questions.
    <= br style=3D"margin:0px;padding:0px">
    Thomas


    On Mon, Aug 5, 2013 at 5:18 PM, JP Va= sseur (jvasseur) <jvasseur@cisco.com> wrote:
    Agree with Carsten and Pascal, I would stick to LBR and me= ntion PCE specifically

    On Aug 5, 2013, at 1:54 AM, Carsten Bormann <cabo@tzi.org> wrote:

    > On Aug 4, 2013, at 20:04, Ted Lemon <Ted.Lemon@nominum.com> wrote:
    >
    >> The normal pronunciation of this acronym at least in German
    >
    > For a German: TSCH =3D Tisch =3D "tish".
    > Add "six" (english pronunciation), and it's "sixtis= h".
    > Not too hard.
    >
    > On the charter itself: I was rather skeptical about the version we dis= cussed in Berlin, and I'm now less worried.
    >
    > I don't quite understand the text for work item 1. =A0Why is this = about querying (which I would have expected in a garden variety management = protocol) and not about setting up? =A0Maybe I don't understand the rel= ationship between 1 and 2.
    >
    > Work item 2: s/hard-coded/pre-configured/?
    >
    > I would probably stick with the "LBR" terminology as others = have said.
    >
    > We may need to discuss how the multi-LBR technology in 6TSCH (ND-proxy= ?) relates to that potentially addressed by 6Lo. =A0Since I don't think= we will fully understand the relationship before the charters get finalize= d, maybe just note that in the charter. =A0(Maybe it is also worth highligh= ting any working relationship with ROLL, if that is required. =A0Is RPL bei= ng modified by 6TSCH?)
    >
    > The charter currently does not discuss security or management, and I w= ould prefer a clear statement whether that is in scope (re management, see = comment about work item 1 above; security for bootstrapping a network is a = complex issue where it would surprise me if people think this is in scope).=
    >
    > Gr=FC=DFe, Carsten
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    --047d7b2e0e8f63559c04e34cfe4e-- From jvasseur@cisco.com Tue Aug 6 17:45:38 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4B02811E80FD for <6tsch@ietfa.amsl.com>; Tue, 6 Aug 2013 17:45:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.098 X-Spam-Level: X-Spam-Status: No, score=-10.098 tagged_above=-999 required=5 tests=[AWL=-0.500, BAYES_00=-2.599, HTML_MESSAGE=0.001, J_BACKHAIR_43=1, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ohnTRq274I7U for <6tsch@ietfa.amsl.com>; Tue, 6 Aug 2013 17:45:23 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id 3DF7521F842B for <6tsch@ietf.org>; Tue, 6 Aug 2013 17:45:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=35710; q=dns/txt; s=iport; t=1375836323; x=1377045923; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=9+gM9TcbRpkOhirMwVihhO7KvpZixf/xqKJ/BJOhMT0=; b=JsfM84Rxn+OYftiZGPuCPiOErZqvqLgPIY3Ajv9gQtHZjl9UOR5bsOfw rC0MUXWu8cOPYGAO8WI4rrzRDDZbhDGxOEsG4WhFmKqTN9MPWbSUkniPb 3YqAC4hQW5xNNCikfkHsWEif/ILVa+HPuW4Ztph+mMVbrZOP/j38F72/K E=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ah4FAF+YAVKtJXHA/2dsb2JhbABaDoI0RDVQti2IQoEcFnSCJAEBAQMBAQEBJEcEBwULAgEIEgYKFgEGBycLFAMOAgQOBQgBEodvBgy3So5kAYEELQQGAQIHgxF0A4hzkBiQJYJZPoFxOQ X-IronPort-AV: E=Sophos;i="4.89,829,1367971200"; d="scan'208,217";a="244310269" Received: from rcdn-core2-5.cisco.com ([173.37.113.192]) by rcdn-iport-2.cisco.com with ESMTP; 07 Aug 2013 00:45:22 +0000 Received: from xhc-rcd-x14.cisco.com (xhc-rcd-x14.cisco.com [173.37.183.88]) by rcdn-core2-5.cisco.com (8.14.5/8.14.5) with ESMTP id r770jLeC011450 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 7 Aug 2013 00:45:21 GMT Received: from xmb-rcd-x02.cisco.com ([169.254.4.27]) by xhc-rcd-x14.cisco.com ([173.37.183.88]) with mapi id 14.02.0318.004; Tue, 6 Aug 2013 19:45:21 -0500 From: "JP Vasseur (jvasseur)" To: Thomas Watteyne Thread-Topic: [6tsch] Finalized charter Thread-Index: AQHOkjqAOuiJTa5THkWLQbFuOEtRIw== Date: Wed, 7 Aug 2013 00:45:21 +0000 Message-ID: <03B78081B371D44390ED6E7BADBB4A77236C74FD@xmb-rcd-x02.cisco.com> References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> <09CE48E0-35A4-46BA-98F9-9EDD3A1C13D5@tzi.org> <03B78081B371D44390ED6E7BADBB4A77236C036B@xmb-rcd-x02.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.21.113.17] Content-Type: multipart/alternative; boundary="_000_03B78081B371D44390ED6E7BADBB4A77236C74FDxmbrcdx02ciscoc_" MIME-Version: 1.0 Cc: 6TSCH <6tsch@ietf.org>, Ted Lemon Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 00:45:38 -0000 --_000_03B78081B371D44390ED6E7BADBB4A77236C74FDxmbrcdx02ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Thomas, On Aug 6, 2013, at 1:08 PM, Thomas Watteyne > wrote: JP, Carsten, Thanks for the very valuable input on the charter. Let me try to summarize = your comments and provide an answer to the issues you raise below. BBR->LBR Suggestion from JP. Changing BBR to LBR would align terminology with the RO= LL WG. For reference, here are the definitions in the latest versions of the draft= s: * LBR (draft-ietf-roll-terminology-12): Low power and Lossy Network Bor= der Router. The LBR is a device that connects the Low power and Lossy Netw= ork to another routing domain such as a Local Area Network (LAN), Wide Area= Network (WAN) or the Internet where a possibly different routing protocol = is in operation. The LBR acts as a routing device and may possibly host ot= her functions such as data collector or aggregator. * BBR (draft-thubert-6lowpan-backbone-router-03): An IPv6 router that f= ederates the LLN using a Backbone link as a backbone. A BBR acts as a 6LoWP= AN Border Routers (6LBR) and an Energy Aware Default Router (NEAR). These are indeed very close terms. Whatever the name, I believe we are talk= ing about an entity which plays several roles, including handling downstrea= m routes where applicable (RPL), compacting 6LoWPAN header (6LoWPAN), and f= ederating several LLNs under one prefix (ND). As usual, these functions can= be co-located in the same box. While I don't have a strong opinion on this, I tend to agree that LBR is a = more established term than BBR, and maybe a bit more generic according to t= he definitions above. Yet, we have already sent the proposed charter to the ADs for review. What = I have done is filing https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/= 5/bbr-lbr, to keep track of your suggestion. We can integrate it if request= ed during future discussion about the charter with the IESG. JP> Perfect. Add PCE to WG to interact with Suggestion from JP. The idea is to list PCE as a WG to interact with. The reason we did not include it in the text is because the definition of t= he node<->PCE interaction is not within scope of this charter. Work item 1 = covers the format of the payload (e.g. the bits and bytes to describe a cel= l), but not the exact transport solution or interaction. That being said, this is absolutely what we tend towards, and when we expli= citly work on that, we will be interacting with the PCE WG. I understand yo= u are suggesting to list PCE right away. I have filed https://bitbucket.org= /6tsch/charter-ietf-6tsch/issue/6/add-pce-to-wg-to-interact-with to cover t= his. JP> Thanks because even if the node<->PCE interaction is not yet in the cha= rter, and the same applies to PCE discovery, ... the fundamental notion of PCE is part of the architectur= e. I understand that for now the schedule is static but we still make use of some PCE architecture, that wil= l unavoidably evolve to more dynamic scenarios. Interaction between Work Item 1 and 2 Clarifying question from Carsten. The goal of work item 1 is to describe a format for the PCE to be able to s= end commands to the nodes, and for the nodes to send statistics and topolog= ical information to the PCE. In this version of the charter, we assume that= the schedule is static, i.e. we do not address the PCE->nodes traffic yet.= That being said, statistics and topological information can flow from node= to PCE in a network resulting from work item 2. This for example allows fo= r close monitoring of the health of the network. That being said, the scope of work item 1 is very clear and very "atomic". = Management includes setup, update, tear down, as well as getting reports. T= he scope of work item 1 is not to focus on "network management" as a whole,= only to produce formats and methods that can be used by all points of comm= and, including PCE, node configuration, network management, etc. JP> On that end, the ability for the PCE to "push" states (setup, update, .= ..) has been part of our rechartering exercise with statefull PCE. hard-coded -> pre-configured Suggestion from Carsten. The term "pre-configured" is indeed more elegant than the term "hard-coded"= . Would you agree, however, that both terms end up expressing the same idea= ? I have filed https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/7/hard-= coded-pre-configured to track and remember this suggestion. Note that there is an intent that we provide a basic schedule that would op= erate without any configuration. Then through the methods in item 1 we prop= ose to optionally set up an initial schedule that the node will use instead= . changing RPL? Clarifying question from Carsten. The goal of the work at 6TSCH is absolutely not to change RPL, just to desc= ribe how RPL can be be used on these time slotted networks. This is probabl= y going to be the biggest piece of the work done in work item 2. What we mi= ght do is define some metrics and maybe even an OF, but NOT to request any = changes to RPL itself. I would argue that, if the goal were to change RPL, this would appear clear= ly in the charter text. In the absence of the statement "we want to change = RPL", we assume that the reader understands that the goal is to not change = RPL. We may study objective functions and new options, in particular to tra= nsport a schedule, but we are not chartering to standardize work there. JP> And this is perfectly fine; we could discuss of where such extensions c= ould be discussed, I would be perfectly happy with both WG reviews, as long as these items do not "impact" the prot= ocol, in which case I'd rather see the work in ROLL, reviewed by 6TSCH. But again, I do not see that as an issue, = risk of overlap, ... security in scope? Clarifying question from Carsten. We have had numerous discussion about this last week, including in-person w= ith Yoshihiro, Subir, Rafa, and by e-mail with Rene. I believe we had a ver= y similar discussion with Rene, which you can find at http://www.ietf.org/m= ail-archive/web/6tsch/current/msg00985.html. Rene agreed with the discussio= n. In very short, work on security and management is welcome but we do not cha= rter a work item for this round. I hope this answers your questions. JP> As far as I am concerned, it does answer the questions, I am VERY suppo= rtive ! Thanks. JP. Thomas On Mon, Aug 5, 2013 at 5:18 PM, JP Vasseur (jvasseur) > wrote: Agree with Carsten and Pascal, I would stick to LBR and mention PCE specifi= cally On Aug 5, 2013, at 1:54 AM, Carsten Bormann > wrote: > On Aug 4, 2013, at 20:04, Ted Lemon > wrote: > >> The normal pronunciation of this acronym at least in German > > For a German: TSCH =3D Tisch =3D "tish". > Add "six" (english pronunciation), and it's "sixtish". > Not too hard. > > On the charter itself: I was rather skeptical about the version we discus= sed in Berlin, and I'm now less worried. > > I don't quite understand the text for work item 1. Why is this about que= rying (which I would have expected in a garden variety management protocol)= and not about setting up? Maybe I don't understand the relationship betwe= en 1 and 2. > > Work item 2: s/hard-coded/pre-configured/? > > I would probably stick with the "LBR" terminology as others have said. > > We may need to discuss how the multi-LBR technology in 6TSCH (ND-proxy?) = relates to that potentially addressed by 6Lo. Since I don't think we will = fully understand the relationship before the charters get finalized, maybe = just note that in the charter. (Maybe it is also worth highlighting any wo= rking relationship with ROLL, if that is required. Is RPL being modified b= y 6TSCH?) > > The charter currently does not discuss security or management, and I woul= d prefer a clear statement whether that is in scope (re management, see com= ment about work item 1 above; security for bootstrapping a network is a com= plex issue where it would surprise me if people think this is in scope). > > Gr=FC=DFe, Carsten > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_03B78081B371D44390ED6E7BADBB4A77236C74FDxmbrcdx02ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable Hi Thomas,

    On Aug 6, 2013, at 1:08 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wrote:

    JP, Carsten,

    Thanks for the ve= ry valuable input on the charter. Let me try to summarize your comments and= provide an answer to the issues you raise below.

    BBR->LBR<= /span>

    Suggestion from JP. Changing BBR to LBR would align term= inology with the ROLL WG.

    For reference, he= re are the definitions in the latest versions of the drafts:
    • LBR (draft-ietf-roll= -terminology-12): Low power and Lossy Network Border Router.  The LBR is a device that connects the Low power and Lossy Ne= twork to another routing domain such as a Local Area Network (LAN), Wide Ar= ea Network (WAN) or the Internet where a possibly different routing protoco= l is in operation.  The LBR acts as a routing device and may possibly host other functions such as data collecto= r or aggregator.
    • BBR (draft-thubert-6= lowpan-backbone-router-03): An IPv6 router that federates the LLN using a Backbone link as a backbone. A BBR acts as a 6LoWPAN Borde= r Routers (6LBR) and an Energy Aware Default Router (NEAR).

    These are indeed = very close terms. Whatever the name, I believe we are talking about an enti= ty which plays several roles, including handling downstream routes where ap= plicable (RPL), compacting 6LoWPAN header (6LoWPAN), and federating several LLNs under one prefix (ND). As usual, th= ese functions can be co-located in the same box.

    While I don't hav= e a strong opinion on this, I tend to agree that LBR is a more established = term than BBR, and maybe a bit more generic according to the definitions ab= ove.

    Yet, we have alre= ady sent the proposed charter to the ADs for review. What I have done is fi= ling = https://bitbucket.org/6tsch/charter-ietf-6= tsch/issue/5/bbr-lbr, to keep track of your suggestion. We can integrate it if requested during = future discussion about the charter with the IESG.


    JP> Perfect.

    Add PCE to WG to int= eract with

    Suggestion from JP. The idea is to list PCE as a WG to i= nteract with.

    The reason we did= not include it in the text is because the definition of the node<->P= CE interaction is not within scope of this charter. Work item 1 covers the = format of the payload (e.g. the bits and bytes to describe a cell), but not the exact transport solution or interaction.<= /span>

    That being said, = this is absolutely what we tend towards, and when we explicitly work on tha= t, we will be interacting with the PCE WG. I understand you are suggesting = to list PCE right away. I have filed https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/6/add-pce= -to-wg-to-interact-with to cover this.


    JP> Thanks because even if the node<->PCE interaction is not = yet in the charter, and the same applies to 
    PCE discovery, ... the fundamental notion of PCE is part of the archit= ecture. I understand that for now the
    schedule is static but we still make use of some PCE architecture, tha= t will unavoidably evolve to more 
    dynamic scenarios.

    Interaction between = Work Item 1 and 2

    Clarifying question from Carsten.

    The goal of work = item 1 is to describe a format for the PCE to be able to send commands to t= he nodes, and for the nodes to send statistics and topological information = to the PCE. In this version of the charter, we assume that the schedule is static, i.e. we do not address the PCE->= nodes traffic yet. That being said, statistics and topological information = can flow from node to PCE in a network resulting from work item 2. This for= example allows for close monitoring of the health of the network.

    That being said, = the scope of work item 1 is very clear and very "atomic". Managem= ent includes setup, update, tear down, as well as getting reports. The scop= e of work item 1 is not to focus on "network management" as a whole, only to produce formats and methods that can be used by all po= ints of command, including PCE, node configuration, network management, etc= .

    JP> On that end, the ability for the PCE to "push" states= (setup, update, ...) has been part of our rechartering
    exercise with statefull PCE.


    hard-coded -> pre= -configured

    Suggestion from Carsten.

    The term "pr= e-configured" is indeed more elegant than the term "hard-coded&qu= ot;. Would you agree, however, that both terms end up expressing the same i= dea? I have filed https://bit= bucket.org/6tsch/charter-ietf-6tsch/issue/7/hard-coded-pre-configured to track and remember this suggestion.

    Note that there i= s an intent that we provide a basic schedule that would operate without any= configuration. Then through the methods in item 1 we propose to optionally= set up an initial schedule that the node will use instead.

    changing RPL?

    Clarifying question from Carsten.

    The goal of the w= ork at 6TSCH is absolutely not to change RPL, just to describe how RPL can = be be used on these time slotted networks. This is probably going to be the= biggest piece of the work done in work item 2. What we might do is define some metrics and maybe even an OF, but = NOT to request any changes to RPL itself.

    I would argue tha= t, if the goal were to change RPL, this would appear clearly in the charter= text. In the absence of the statement "we want to change RPL", w= e assume that the reader understands that the goal is to not change RPL. We may study objective functions and new option= s, in particular to transport a schedule, but we are not chartering to stan= dardize work there.


    JP> And this is perfectly fine; we could discuss of where such exte= nsions could be discussed, I would be perfectly
    happy with both WG reviews, as long as these items do not "impact= " the protocol, in which case I'd rather see the
    work in ROLL, reviewed by 6TSCH. But again, I do not see that as an is= sue, risk of overlap, ... 

    security in scope?

    Clarifying question from Carsten.

    We have had numer= ous discussion about this last week, including in-person with Yoshihiro, Su= bir, Rafa, and by e-mail with Rene. I believe we had a very similar discuss= ion with Rene, which you can find at http://w= ww.ietf.org/mail-archive/web/6tsch/current/msg00985.html. Rene agreed with the discussion.

    In very short, wo= rk on security and management is welcome but we do not charter a work item = for this round.

    I hope this answe= rs your questions.

    JP> As far as I am concerned, it does answer the questions, I am VE= RY supportive !

    Thanks.

    JP.


    Thomas


    On Mon, Aug 5, 2013 at 5:18 PM, JP Vasseur (jvas= seur) <jvasseur@cisco.= com> wrote:
    Agree with Carsten and Pascal, I would stick to LBR and mention PCE specifi= cally

    On Aug 5, 2013, at 1:54 AM, Carsten Bormann <cabo@tzi.org> wrote:

    > On Aug 4, 2013, at 20:04, Ted Lemon <Ted.Lemon@nominum.com> wrote:
    >
    >> The normal pronunciation of this acronym at least in German
    >
    > For a German: TSCH =3D Tisch =3D "tish".
    > Add "six" (english pronunciation), and it's "sixtish&qu= ot;.
    > Not too hard.
    >
    > On the charter itself: I was rather skeptical about the version we dis= cussed in Berlin, and I'm now less worried.
    >
    > I don't quite understand the text for work item 1.  Why is this a= bout querying (which I would have expected in a garden variety management p= rotocol) and not about setting up?  Maybe I don't understand the relat= ionship between 1 and 2.
    >
    > Work item 2: s/hard-coded/pre-configured/?
    >
    > I would probably stick with the "LBR" terminology as others = have said.
    >
    > We may need to discuss how the multi-LBR technology in 6TSCH (ND-proxy= ?) relates to that potentially addressed by 6Lo.  Since I don't think = we will fully understand the relationship before the charters get finalized= , maybe just note that in the charter.  (Maybe it is also worth highlighting any working relationship with ROLL, if that = is required.  Is RPL being modified by 6TSCH?)
    >
    > The charter currently does not discuss security or management, and I w= ould prefer a clear statement whether that is in scope (re management, see = comment about work item 1 above; security for bootstrapping a network is a = complex issue where it would surprise me if people think this is in scope).
    >
    > Gr=FC=DFe, Carsten
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    https://www.ietf.or= g/mailman/listinfo/6tsch

    --_000_03B78081B371D44390ED6E7BADBB4A77236C74FDxmbrcdx02ciscoc_-- From twatteyne@gmail.com Tue Aug 6 17:47:25 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A4DB111E80F2 for <6tsch@ietfa.amsl.com>; Tue, 6 Aug 2013 17:47:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.433 X-Spam-Level: X-Spam-Status: No, score=-1.433 tagged_above=-999 required=5 tests=[AWL=-0.456, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_BACKHAIR_43=1, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nTKTcyI-YZxQ for <6tsch@ietfa.amsl.com>; Tue, 6 Aug 2013 17:47:24 -0700 (PDT) Received: from mail-pd0-x22d.google.com (mail-pd0-x22d.google.com [IPv6:2607:f8b0:400e:c02::22d]) by ietfa.amsl.com (Postfix) with ESMTP id 406DA11E8101 for <6tsch@ietf.org>; Tue, 6 Aug 2013 17:47:24 -0700 (PDT) Received: by mail-pd0-f173.google.com with SMTP id p11so812103pdj.4 for <6tsch@ietf.org>; Tue, 06 Aug 2013 17:47:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=L2VkXgvwTc6IF63/6CBEVJF4QrLsKmu2sJwAEe3oN+4=; b=yVlhh+gI+I0eDBVV78NvmbmbfXq7Mjgj1oPJY5vvOhII5MAjOIGd9prGp5yGPQ3MAI +tbof3cpLnYgHmd7dFB6UkBWQDtWDjg5OQwvDI2nOOnnArNbvCsLY08cScvj0NB4HRVH /VbbDJElCFmzTkdiQ+7MCXfydzY7gybekZtDTn2lHc3aAFYT3OMlRAdwMuIPEFBXoFmf tHuA30ykx8O5FEUX9vEGP0m1TtLXfNj2wWoivp/GRisJr6n2u4Rvr53VOBkHqrSjmnKj jQzbtjKG9vU4sfDzZw0su6bqLnr3cb87+4bF0j7emFxtWVAoDqtkHHVbZFa74m9PHpC2 NbDg== X-Received: by 10.68.235.37 with SMTP id uj5mr797125pbc.85.1375836443944; Tue, 06 Aug 2013 17:47:23 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 6 Aug 2013 17:47:03 -0700 (PDT) In-Reply-To: <03B78081B371D44390ED6E7BADBB4A77236C74FD@xmb-rcd-x02.cisco.com> References: <59D0F1BC-0A1C-4F7C-94ED-95C3C597CB13@viagenie.ca> <8D23D4052ABE7A4490E77B1A012B6307752430E4@mbx-01.win.nominum.com> <09CE48E0-35A4-46BA-98F9-9EDD3A1C13D5@tzi.org> <03B78081B371D44390ED6E7BADBB4A77236C036B@xmb-rcd-x02.cisco.com> <03B78081B371D44390ED6E7BADBB4A77236C74FD@xmb-rcd-x02.cisco.com> From: Thomas Watteyne Date: Tue, 6 Aug 2013 17:47:03 -0700 X-Google-Sender-Auth: X9tXlf7oh17IItMzk7vmnRcZd7A Message-ID: To: "JP Vasseur (jvasseur)" Content-Type: multipart/alternative; boundary=047d7b33c78882ac3f04e350e2a8 Cc: 6TSCH <6tsch@ietf.org>, Ted Lemon Subject: Re: [6tsch] Finalized charter X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 00:47:25 -0000 --047d7b33c78882ac3f04e350e2a8 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable JP, Wonderful, thanks for the quick answer and support. Thomas On Tue, Aug 6, 2013 at 5:45 PM, JP Vasseur (jvasseur) w= rote: > Hi Thomas, > > On Aug 6, 2013, at 1:08 PM, Thomas Watteyne > wrote: > > JP, Carsten, > > Thanks for the very valuable input on the charter. Let me try to > summarize your comments and provide an answer to the issues you raise bel= ow. > > *BBR->LBR* > > *Suggestion from JP. Changing BBR to LBR would align terminology with > the ROLL WG.* > > For reference, here are the definitions in the latest versions of the > drafts: > > - *LBR* (draft-ietf-roll-terminology-12): Low power and Lossy Network > Border Router. The LBR is a device that connects the Low power and Lo= ssy > Network to another routing domain such as a Local Area Network (LAN), = Wide > Area Network (WAN) or the Internet where a possibly different routing > protocol is in operation. The LBR acts as a routing device and may > possibly host other functions such as data collector or aggregator. > > > - *BBR* (draft-thubert-6lowpan-backbone-router-03): An IPv6 router > that federates the LLN using a Backbone link as a backbone. A BBR acts= as a > 6LoWPAN Border Routers (6LBR) and an Energy Aware Default Router (NEAR= ). > > > These are indeed very close terms. Whatever the name, I believe we are > talking about an entity which plays several roles, including handling > downstream routes where applicable (RPL), compacting 6LoWPAN header > (6LoWPAN), and federating several LLNs under one prefix (ND). As usual, > these functions can be co-located in the same box. > > While I don't have a strong opinion on this, I tend to agree that LBR is > a more established term than BBR, and maybe a bit more generic according = to > the definitions above. > > Yet, we have already sent the proposed charter to the ADs for review. > What I have done is filing > https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/5/bbr-lbr, to keep > track of your suggestion. We can integrate it if requested during future > discussion about the charter with the IESG. > > > JP> Perfect. > > *Add PCE to WG to interact with* > > *Suggestion from JP. The idea is to list PCE as a WG to interact with.* > > The reason we did not include it in the text is because the definition > of the node<->PCE interaction is not within scope of this charter. Work > item 1 covers the format of the payload (e.g. the bits and bytes to > describe a cell), but not the exact transport solution or interaction. > > That being said, this is absolutely what we tend towards, and when we > explicitly work on that, we will be interacting with the PCE WG. I > understand you are suggesting to list PCE right away. I have filed > https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/6/add-pce-to-wg-to-i= nteract-with > to cover this. > > > JP> Thanks because even if the node<->PCE interaction is not yet in the > charter, and the same applies to > PCE discovery, ... the fundamental notion of PCE is part of the > architecture. I understand that for now the > schedule is static but we still make use of some PCE architecture, that > will unavoidably evolve to more > dynamic scenarios. > > *Interaction between Work Item 1 and 2* > > *Clarifying question from Carsten.* > > The goal of work item 1 is to describe a format for the PCE to be able > to send commands to the nodes, and for the nodes to send statistics and > topological information to the PCE. In this version of the charter, we > assume that the schedule is static, i.e. we do not address the PCE->nodes > traffic yet. That being said, statistics and topological information can > flow from node to PCE in a network resulting from work item 2. This for > example allows for close monitoring of the health of the network. > > That being said, the scope of work item 1 is very clear and very > "atomic". Management includes setup, update, tear down, as well as gettin= g > reports. The scope of work item 1 is not to focus on "network management" > as a whole, only to produce formats and methods that can be used by all > points of command, including PCE, node configuration, network management, > etc. > > > JP> On that end, the ability for the PCE to "push" states (setup, > update, ...) has been part of our rechartering > exercise with statefull PCE. > > > *hard-coded -> pre-configured* > > *Suggestion from Carsten.* > > The term "pre-configured" is indeed more elegant than the term > "hard-coded". Would you agree, however, that both terms end up expressing > the same idea? I have filed > https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/7/hard-coded-pre-con= figured to > track and remember this suggestion. > > Note that there is an intent that we provide a basic schedule that would > operate without any configuration. Then through the methods in item 1 we > propose to optionally set up an initial schedule that the node will use > instead. > > *changing RPL?* > > *Clarifying question from Carsten.* > > The goal of the work at 6TSCH is absolutely not to change RPL, just to > describe how RPL can be be used on these time slotted networks. This is > probably going to be the biggest piece of the work done in work item 2. > What we might do is define some metrics and maybe even an OF, but NOT to > request any changes to RPL itself. > > I would argue that, if the goal were to change RPL, this would appear > clearly in the charter text. In the absence of the statement "we want to > change RPL", we assume that the reader understands that the goal is to no= t > change RPL. We may study objective functions and new options, in particul= ar > to transport a schedule, but we are not chartering to standardize work > there. > > > JP> And this is perfectly fine; we could discuss of where such > extensions could be discussed, I would be perfectly > happy with both WG reviews, as long as these items do not "impact" the > protocol, in which case I'd rather see the > work in ROLL, reviewed by 6TSCH. But again, I do not see that as an issue= , > risk of overlap, ... > > *security in scope?* > > *Clarifying question from Carsten.* > > We have had numerous discussion about this last week, including > in-person with Yoshihiro, Subir, Rafa, and by e-mail with Rene. I believe > we had a very similar discussion with Rene, which you can find at > http://www.ietf.org/mail-archive/web/6tsch/current/msg00985.html. Rene > agreed with the discussion. > > In very short, work on security and management is welcome but we do not > charter a work item for this round. > > I hope this answers your questions. > > > JP> As far as I am concerned, it does answer the questions, I am VERY > supportive ! > > Thanks. > > JP. > > > Thomas > > > On Mon, Aug 5, 2013 at 5:18 PM, JP Vasseur (jvasseur) wrote: > >> Agree with Carsten and Pascal, I would stick to LBR and mention PCE >> specifically >> >> On Aug 5, 2013, at 1:54 AM, Carsten Bormann wrote: >> >> > On Aug 4, 2013, at 20:04, Ted Lemon wrote: >> > >> >> The normal pronunciation of this acronym at least in German >> > >> > For a German: TSCH =3D Tisch =3D "tish". >> > Add "six" (english pronunciation), and it's "sixtish". >> > Not too hard. >> > >> > On the charter itself: I was rather skeptical about the version we >> discussed in Berlin, and I'm now less worried. >> > >> > I don't quite understand the text for work item 1. Why is this about >> querying (which I would have expected in a garden variety management >> protocol) and not about setting up? Maybe I don't understand the >> relationship between 1 and 2. >> > >> > Work item 2: s/hard-coded/pre-configured/? >> > >> > I would probably stick with the "LBR" terminology as others have said. >> > >> > We may need to discuss how the multi-LBR technology in 6TSCH >> (ND-proxy?) relates to that potentially addressed by 6Lo. Since I don't >> think we will fully understand the relationship before the charters get >> finalized, maybe just note that in the charter. (Maybe it is also worth >> highlighting any working relationship with ROLL, if that is required. I= s >> RPL being modified by 6TSCH?) >> > >> > The charter currently does not discuss security or management, and I >> would prefer a clear statement whether that is in scope (re management, = see >> comment about work item 1 above; security for bootstrapping a network is= a >> complex issue where it would surprise me if people think this is in scop= e). >> > >> > Gr=FC=DFe, Carsten >> > >> > _______________________________________________ >> > 6tsch mailing list >> > 6tsch@ietf.org >> > https://www.ietf.org/mailman/listinfo/6tsch >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > > --047d7b33c78882ac3f04e350e2a8 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    JP,
    Wonderful, thanks for the quick answer and support= .
    Thomas


    On Tue, Aug 6, 2013 at 5:45 PM, JP Vasseur (jvasseur) <j= vasseur@cisco.com> wrote:
    Hi Thomas,

    On Aug 6, 2013, at 1:08 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu>= ; wrote:

    JP, Carsten,

    Thanks for the very valuable= input on the charter. Let me try to summarize your comments and provide an= answer to the issues you raise below.

    BBR->LBR

    Suggestion from JP. Changing BBR to LBR would align terminology wit= h the ROLL WG.

    For reference, here are the = definitions in the latest versions of the drafts:
    • LBR=A0(draft-ietf-roll-terminology-12): Low pow= er and Lossy Network Border Router.=A0 The LBR is a device that connects the Low power and Lossy Netwo= rk to another routing domain such as a Local Area Network (LAN), Wide Area = Network (WAN) or the Internet where a possibly different routing protocol i= s in operation.=A0 The LBR acts as a routing device and may possibly host other functions such as data collecto= r or aggregator.
    • BBR=A0(draft-thubert-6lowpan-backbone-router-03= ): An IPv6 router that federates the LLN using a Backbone link as a backbone. A BBR acts as a 6LoWPAN Borde= r Routers (6LBR) and an Energy Aware Default Router (NEAR).

    These are indeed very close = terms. Whatever the name, I believe we are talking about an entity which pl= ays several roles, including handling downstream routes where applicable (R= PL), compacting 6LoWPAN header (6LoWPAN), and federating several LLNs under one prefix (ND). As usual, th= ese functions can be co-located in the same box.

    While I don't have a str= ong opinion on this, I tend to agree that LBR is a more established term th= an BBR, and maybe a bit more generic according to the definitions above.

    Yet, we have already sent th= e proposed charter to the ADs for review. What I have done is filing=A0https://bitbucket.org/6tsch/charter-ietf-6tsch/is= sue/5/bbr-lbr, to keep track of your suggestion. We can integrate it if requested during = future discussion about the charter with the IESG.


    JP> Perfect.

    Add PCE to WG to interact with<= /u>

    Suggestion from JP. The idea is to list PCE as a WG to interact wit= h.

    The reason we did not includ= e it in the text is because the definition of the node<->PCE interact= ion is not within scope of this charter. Work item 1 covers the format of t= he payload (e.g. the bits and bytes to describe a cell), but not the exact transport solution or interaction.<= /span>

    That being said, this is abs= olutely what we tend towards, and when we explicitly work on that, we will = be interacting with the PCE WG. I understand you are suggesting to list PCE= right away. I have filed=A0https://bitbucket.org/6tsch/charter-ietf-6tsch/issue/6/add-pce-to-wg-= to-interact-with=A0

    JP> Thanks because even if the node<->PCE interaction i= s not yet in the charter, and the same applies to=A0
    PCE discovery, ... the fundamental notion of PCE is part of the archit= ecture. I understand that for now the
    schedule is static but we still make use of some PCE architecture, tha= t will unavoidably evolve to more=A0
    dynamic scenarios.

    Interaction between Work Item 1= and 2

    Clarifying question from Carsten.

    The goal of work item 1 is t= o describe a format for the PCE to be able to send commands to the nodes, a= nd for the nodes to send statistics and topological information to the PCE.= In this version of the charter, we assume that the schedule is static, i.e. we do not address the PCE->= nodes traffic yet. That being said, statistics and topological information = can flow from node to PCE in a network resulting from work item 2. This for= example allows for close monitoring of the health of the network.

    That being said, the scope o= f work item 1 is very clear and very "atomic". Management include= s setup, update, tear down, as well as getting reports. The scope of work i= tem 1 is not to focus on "network management" as a whole, only to produce formats and methods that can be used by all po= ints of command, including PCE, node configuration, network management, etc= .

    JP> On that end, the ability for the PCE to "push" = states (setup, update, ...) has been part of our rechartering
    exercise with statefull PCE.


    hard-coded -> pre-configured=

    Suggestion from Carsten.

    The term "pre-configure= d" is indeed more elegant than the term "hard-coded". Would = you agree, however, that both terms end up expressing the same idea? I have= filed=A0https://bitbucket.= org/6tsch/charter-ietf-6tsch/issue/7/hard-coded-pre-configured=A0to track and remember this suggestion.

    Note that there is an intent= that we provide a basic schedule that would operate without any configurat= ion. Then through the methods in item 1 we propose to optionally set up an = initial schedule that the node will use instead.

    changing RPL?

    Clarifying question from Carsten.

    The goal of the work at 6TSC= H is absolutely not to change RPL, just to describe how RPL can be be used = on these time slotted networks. This is probably going to be the biggest pi= ece of the work done in work item 2. What we might do is define some metrics and maybe even an OF, but = NOT to request any changes to RPL itself.

    I would argue that, if the g= oal were to change RPL, this would appear clearly in the charter text. In t= he absence of the statement "we want to change RPL", we assume th= at the reader understands that the goal is to not change RPL. We may study objective functions and new option= s, in particular to transport a schedule, but we are not chartering to stan= dardize work there.


    JP> And this is perfectly fine; we could discuss of where suc= h extensions could be discussed, I would be perfectly
    happy with both WG reviews, as long as these items do not "impact= " the protocol, in which case I'd rather see the
    work in ROLL, reviewed by 6TSCH. But again, I do not see that as an is= sue, risk of overlap, ...=A0

    security in scope?

    Clarifying question from Carsten.

    We have had numerous discuss= ion about this last week, including in-person with Yoshihiro, Subir, Rafa, = and by e-mail with Rene. I believe we had a very similar discussion with Re= ne, which you can find at=A0http://www.ietf= .org/mail-archive/web/6tsch/current/msg00985.html. Rene agreed with the discussion.

    In very short, work on secur= ity and management is welcome but we do not charter a work item for this ro= und.

    I hope this answers your que= stions.

    JP> As far as I am concerned, it does answer the questions, I= am VERY supportive !

    Thanks.

    JP.


    Thomas


    On Mon, Aug 5, 2013 at 5:18 PM, JP Vasseur (jvas= seur) <jvasseur@cisco.= com> wrote:
    Agree with Carsten and Pascal, I would stick to LBR and mention PCE specifi= cally

    On Aug 5, 2013, at 1:54 AM, Carsten Bormann <cabo@tzi.org> wrote:

    > On Aug 4, 2013, at 20:04, Ted Lemon <Ted.Lemon@nominum.com> wrote:
    >
    >> The normal pronunciation of this acronym at least in German
    >
    > For a German: TSCH =3D Tisch =3D "tish".
    > Add "six" (english pronunciation), and it's "sixtis= h".
    > Not too hard.
    >
    > On the charter itself: I was rather skeptical about the version we dis= cussed in Berlin, and I'm now less worried.
    >
    > I don't quite understand the text for work item 1. =A0Why is this = about querying (which I would have expected in a garden variety management = protocol) and not about setting up? =A0Maybe I don't understand the rel= ationship between 1 and 2.
    >
    > Work item 2: s/hard-coded/pre-configured/?
    >
    > I would probably stick with the "LBR" terminology as others = have said.
    >
    > We may need to discuss how the multi-LBR technology in 6TSCH (ND-proxy= ?) relates to that potentially addressed by 6Lo. =A0Since I don't think= we will fully understand the relationship before the charters get finalize= d, maybe just note that in the charter. =A0(Maybe it is also worth highlighting any working relationship with ROLL, if that = is required. =A0Is RPL being modified by 6TSCH?)
    >
    > The charter currently does not discuss security or management, and I w= ould prefer a clear statement whether that is in scope (re management, see = comment about work item 1 above; security for bootstrapping a network is a = complex issue where it would surprise me if people think this is in scope).
    >
    > Gr=FC=DFe, Carsten
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b33c78882ac3f04e350e2a8-- From pascal.thubert@gmail.com Wed Aug 7 10:03:20 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5BFFB11E8151 for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:03:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SW9AAEvMbydX for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:03:19 -0700 (PDT) Received: from mail-lb0-x233.google.com (mail-lb0-x233.google.com [IPv6:2a00:1450:4010:c04::233]) by ietfa.amsl.com (Postfix) with ESMTP id 6505411E8158 for <6tsch@ietf.org>; Wed, 7 Aug 2013 10:03:18 -0700 (PDT) Received: by mail-lb0-f179.google.com with SMTP id v1so1678837lbd.24 for <6tsch@ietf.org>; Wed, 07 Aug 2013 10:03:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=gwjDjrGnGA4wP3LG8uV5C+184rITkSdd4ThYFslnSkk=; b=HSaO6oceEUBMypoMc73YV8+flOy7cnuLLifKgh4G0d/VKJwq53mc7W4FDtuOJtzyGB nTZhV4Xgcu5v+nxjs4UCIU78vVq5SlXuZomL8XwXUPmvK6i9n+JALlRCw92OmlXuCKIL oo8KMmKEgQaj7zLD5DHcOouQ4bE/X5AfnJJ2XPAVTLuxSNyAhG+7O3AohqeiM9Db9Ofq VWvmtuEoEmfE05UEO1wQWW9HLGiSwVbwukx/fF0QvfZ/Genmn899xovdxkLyGZu0xqjA ZSSzZN7KtO0esBzBgR+FW/fT7PP48uao5AB6edON7hMLzoJWsNmNhv2Muz1PLEqHzDfH qb6g== MIME-Version: 1.0 X-Received: by 10.152.4.6 with SMTP id g6mr1872922lag.50.1375894997288; Wed, 07 Aug 2013 10:03:17 -0700 (PDT) Received: by 10.112.34.47 with HTTP; Wed, 7 Aug 2013 10:03:17 -0700 (PDT) Date: Wed, 7 Aug 2013 19:03:17 +0200 Message-ID: From: Pascal Thubert To: IETF 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=089e013d1e608fcaa904e35e849f Subject: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 17:03:20 -0000 --089e013d1e608fcaa904e35e849f Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Dear all: Marc and Ted signaled us that the 6TSCH acronym could get us some bad press= . It's hard to pronounce, many people did not get that we actually pronounce it sixtus. In one hand, the name was used already for quite a while to advertise this work outside, and all that marketing would have to be updated if we change the name now. OTON, if we change later, it will be a lot worse. What do people think? =A8Please shime in! also, we already have a number of candidates: - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) - WiNOT (Wireless Networks for Operational Technology) - 6tis (TIme slotted Synchronized) - Witches (Wireless Time Channel Hopping Employing Slots) We're still looking for alternate good ideas. Please think hard and propose cool stuff! We'll discuss Friday on the opportunity and launch a poll over next week. Enjoy summer : ) Pascal --089e013d1e608fcaa904e35e849f Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Dear all:

    Marc and Ted signaled us that= the 6TSCH acronym could get us some bad press.
    It's hard to = pronounce, many people did not get that we actually pronounce it sixtus.
    In one hand, the name was used already for quite a while to advertise = this work outside, and all that marketing would have to be updated if we ch= ange the name now.
    OTON, if we change later, it will be a lot wor= se.

    What do people think? =A8Please shime in!
    also, we already have a number of candidates:
    - 6chants=A0(IPv6 over = Channel Hopping ANd Time Sliced links)
    -=A06TiCS=A0(IPv6 over= Time-slotted Channel hopping Slots)
    - WiNOT (Wireless Networks for Operational Technology)
    -=A06tis (TIme slotted Syn= chronized)
    = -=A0Witches (Wireless Time Channel Hopping Employing Slots)

    We're still looking for alternate good ideas. Pleas= e think hard and propose cool stuff!

    We'll dis= cuss Friday on the opportunity and launch a poll over next week.

    Enjoy summer : )

    Pascal
    --089e013d1e608fcaa904e35e849f-- From mcr@sandelman.ca Wed Aug 7 10:25:58 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A9F021F8267 for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:25:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.527 X-Spam-Level: X-Spam-Status: No, score=-2.527 tagged_above=-999 required=5 tests=[AWL=0.072, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RLs+usPqkyFE for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:25:46 -0700 (PDT) Received: from tuna.sandelman.ca (tuna.sandelman.ca [IPv6:2607:f0b0:f:3::184]) by ietfa.amsl.com (Postfix) with ESMTP id 1ED3B11E8161 for <6tsch@ietf.org>; Wed, 7 Aug 2013 10:25:29 -0700 (PDT) Received: from sandelman.ca (desk.marajade.sandelman.ca [209.87.252.247]) by tuna.sandelman.ca (Postfix) with ESMTP id 707F62025A; Wed, 7 Aug 2013 14:31:41 -0400 (EDT) Received: by sandelman.ca (Postfix, from userid 179) id 5344AA904C; Wed, 7 Aug 2013 13:23:42 -0400 (EDT) Received: from sandelman.ca (localhost [127.0.0.1]) by sandelman.ca (Postfix) with ESMTP id 376B3B8EA6; Wed, 7 Aug 2013 13:23:42 -0400 (EDT) From: Michael Richardson To: Pascal Thubert In-Reply-To: References: X-Mailer: MH-E 8.2; nmh 1.3-dev; GNU Emacs 23.4.1 X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m Sender: mcr@sandelman.ca Cc: IETF 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 17:25:58 -0000 --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Pascal Thubert wrote: > Marc and Ted signaled us that the 6TSCH acronym could get us some bad= press. > It's hard to pronounce, many people did not get that we actually pron= ounce it > sixtus. So, why not call it that? It doesn't have to be an acronym! > also, we already have a number of candidates: 0> sixtus =3D IPv6 over Time Sloted Channel Hopping 1> -=C2=A06tis (TIme slotted Synchronized) 2> - 6chants=C2=A0(IPv6 over Channel Hopping ANd Time Sliced links) 3> -=C2=A06TiCS=C2=A0(IPv6 over Time-slotted Channel hopping Slots) 4 -=C2=A0Witches (Wireless Time Channel Hopping Employing Slots) 5> - WiNOT (Wireless Networks for Operational Technology) I rank them as above. =2D- Michael Richardson , Sandelman Software Works --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQCVAwUBUgKCmoqHRg3pndX9AQJElQQAxqtUldgX/hmwTiomtgcNEH7oEtfL59lZ sqUIe2jd3jdaOfbJo8o6ebcOiOOWIBuQdKzvMGILU1jFQLuo+MHZ1t0hGNcvTMvh zHjN38kt8vBBefmOIpvzajbDJg0j449k2AIFJ3aljyJUuVfKfGPxgXgPFMz1SLJu LIZdife3tMQ= =PEki -----END PGP SIGNATURE----- --=-=-=-- From xvilajosana@berkeley.edu Wed Aug 7 10:26:21 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EF0F521F9C46 for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:26:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.226 X-Spam-Level: X-Spam-Status: No, score=-2.226 tagged_above=-999 required=5 tests=[AWL=-0.250, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id M85KSCzSXPEu for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:26:08 -0700 (PDT) Received: from mail-pd0-f175.google.com (mail-pd0-f175.google.com [209.85.192.175]) by ietfa.amsl.com (Postfix) with ESMTP id B18C911E8165 for <6tsch@ietf.org>; Wed, 7 Aug 2013 10:25:34 -0700 (PDT) Received: by mail-pd0-f175.google.com with SMTP id 5so1626525pdd.6 for <6tsch@ietf.org>; Wed, 07 Aug 2013 10:25:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=eOZWP1Ooo0+N6Vkvg9H2qY7R6gvjmlP/wiRu8frjBqE=; b=lWbRewrdPh8B1nTjh6rDCdPsDkI0aZ7J6aTogzLYrRpln/Q3rp7hTNLiUDBZg8njSI Hs4ywBHgRRfoDILoiXDCqbTE6TNF+6X/aBTjuFzz0iHmH9czfLfvDm5nF9nG+oT5Ml3a elseBp69xFCal+I6xoDegiQ5anWrXXUvl0Ohx6DjS/MHm7sNXNYAPKXNrfqVbqfiXiyt zKAMOM4hQO2zCvtZe0YHaUoAdFWdoJ6x3iQYlIEd23mTiA8rENhPmFaymy+FjvXg/RB1 PkcUa+FZFZqHJNFGysqBFaWcc9seZ9lI7DCgOsIppAl8kR1+vRpyrI2ePddcerrUNGSQ tRmA== X-Gm-Message-State: ALoCoQn88LsOx/01Xa2tmrAMMsY8231mxEZCN3XMSIdB4besR+Ln2PoVK7g2ZrBrtngItcOQc3X8 MIME-Version: 1.0 X-Received: by 10.66.246.225 with SMTP id xz1mr1691257pac.110.1375896320834; Wed, 07 Aug 2013 10:25:20 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Wed, 7 Aug 2013 10:25:20 -0700 (PDT) In-Reply-To: References: Date: Wed, 7 Aug 2013 10:25:20 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Pascal Thubert Content-Type: multipart/alternative; boundary=047d7b15aec573a88e04e35ed39f Cc: IETF 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 17:26:22 -0000 --047d7b15aec573a88e04e35ed39f Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable HI all, I still like 6TSCH pronounced as Sixtus. In German can be pronounced as Sixtisch which is not difficult too. so my vote to keep it as Sixtus (6TSCH) sorry to be so classical :-) X On Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert w= rote: > Dear all: > > Marc and Ted signaled us that the 6TSCH acronym could get us some bad > press. > It's hard to pronounce, many people did not get that we actually pronounc= e > it sixtus. > In one hand, the name was used already for quite a while to advertise thi= s > work outside, and all that marketing would have to be updated if we chang= e > the name now. > OTON, if we change later, it will be a lot worse. > > What do people think? =A8Please shime in! > > also, we already have a number of candidates: > - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) > - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) > - WiNOT (Wireless Networks for Operational Technology) > - 6tis (TIme slotted Synchronized) > - Witches (Wireless Time Channel Hopping Employing Slots) > > We're still looking for alternate good ideas. Please think hard and > propose cool stuff! > > We'll discuss Friday on the opportunity and launch a poll over next week. > > Enjoy summer : ) > > Pascal > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b15aec573a88e04e35ed39f Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    HI all,

    I still like 6TSCH pronounced as= Sixtus. In German can be pronounced as Sixtisch which is not difficult too= .

    so my vote to keep it as Sixtus (6TSCH)

    sorry t= o be so classical :-)
    X


    On= Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert <pascal.thubert@gmail= .com> wrote:
    Dear all:

    Marc and Ted signaled us that the 6TSCH acronym could get us some bad pre= ss.
    It's hard to pronounce, many people did not get that we actually p= ronounce it sixtus.
    In one hand, the name was used already for quite a while to advertise = this work outside, and all that marketing would have to be updated if we ch= ange the name now.
    OTON, if we change later, it will be a lot wor= se.

    What do people think? =A8Please shime in!
    also, we already have a number of candidates:
    - 6chants=A0(IPv6 over = Channel Hopping ANd Time Sliced links)
    -=A06TiCS=A0(IPv6 over Time-slott= ed Channel hopping Slots)
    - WiNOT (Wireless Networks for Operational Technology)
    -=A06tis (TIme slotted Syn= chronized)
    = -=A0Witches (Wireless Time Channel Hopping Employing Slots)

    We're still looking for alternate good ideas. Pleas= e think hard and propose cool stuff!

    We'll dis= cuss Friday on the opportunity and launch a poll over next week.

    Enjoy summer : )

    Pascal

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b15aec573a88e04e35ed39f-- From ksjp@berkeley.edu Wed Aug 7 10:38:50 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A99E711E815C for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:38:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.598 X-Spam-Level: X-Spam-Status: No, score=-3.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Bm+SXflkA4Ea for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:38:42 -0700 (PDT) Received: from mail-pa0-f51.google.com (mail-pa0-f51.google.com [209.85.220.51]) by ietfa.amsl.com (Postfix) with ESMTP id 0B59621F8947 for <6tsch@ietf.org>; Wed, 7 Aug 2013 10:38:42 -0700 (PDT) Received: by mail-pa0-f51.google.com with SMTP id lf11so2391304pab.38 for <6tsch@ietf.org>; Wed, 07 Aug 2013 10:38:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type; bh=Fyr7ef9SUq7r4nMt9GpMQIGYo0siTqYCsjJt8LXixNw=; b=YOgmq2V6vH6IsDtJfq1XfM0OLGNnQPdAkQH26pUng5LtJoNsL1hWj8o/KUO+PkevgZ QU6Q7kdhcdGqzi5H5QB1rTt1pSfmK7HztUpQrhoQ6Wk6ZtZoTMvHQGGYGl8g22Fc3E6A HSx35tG/QcD/jUI7JtFrW9grZvr4tXs/3o01QGTlc0nxJNWFNrc9drVKQ3ysl17qvE0/ bcgKqGbkSoh7KO6zZjWG0pXWcAxPetaSoFR/aE2ouT7qYPXgZYMjOMRmHj2sKgfL85+z afeZLX/+LSGRJn1Ggu/Hi5QUcLUj/XxyACCUal7wAVJyu3wCRNpEKGCkz/MscpKcFLuP kZ1Q== X-Gm-Message-State: ALoCoQn2M34BDDVDdyQOG+VyREG/detFp5uxGH0FW7JieQsn+aAZrKXF1L0/s9RTn8VXi3i3ZZrp X-Received: by 10.66.231.42 with SMTP id td10mr1680070pac.144.1375897121713; Wed, 07 Aug 2013 10:38:41 -0700 (PDT) Received: from [10.70.40.32] ([134.24.149.4]) by mx.google.com with ESMTPSA id sp4sm9364648pbc.45.2013.08.07.10.38.40 for <6tsch@ietf.org> (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 07 Aug 2013 10:38:41 -0700 (PDT) Message-ID: <52028620.1090605@berkeley.edu> Date: Wed, 07 Aug 2013 10:38:40 -0700 From: Kris Pister User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: 6tsch@ietf.org References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------040201090707040406090803" Subject: [6tsch] (not) Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 17:38:50 -0000 This is a multi-part message in MIME format. --------------040201090707040406090803 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit I agree with Xavi. 6tsch is descriptive of exactly what we're doing, and I think that we should keep it. Pronunciation seems secondary. Don't we have more important things to work on? ksjp On 8/7/2013 10:25 AM, Xavier Vilajosana Guillen wrote: > HI all, > > I still like 6TSCH pronounced as Sixtus. In German can be pronounced > as Sixtisch which is not difficult too. > > so my vote to keep it as Sixtus (6TSCH) > > sorry to be so classical :-) > X > > > On Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert > > wrote: > > Dear all: > > Marc and Ted signaled us that the 6TSCH acronym could get us some > bad press. > It's hard to pronounce, many people did not get that we actually > pronounce it sixtus. > In one hand, the name was used already for quite a while to > advertise this work outside, and all that marketing would have to > be updated if we change the name now. > OTON, if we change later, it will be a lot worse. > > What do people think? ¨Please shime in! > > also, we already have a number of candidates: > - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) > - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) > - WiNOT (Wireless Networks for Operational Technology) > - 6tis (TIme slotted Synchronized) > - Witches (Wireless Time Channel Hopping Employing Slots) > > We're still looking for alternate good ideas. Please think hard > and propose cool stuff! > > We'll discuss Friday on the opportunity and launch a poll over > next week. > > Enjoy summer : ) > > Pascal > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch --------------040201090707040406090803 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit I agree with Xavi.  6tsch is descriptive of exactly what we're doing, and I think that we should keep it.
    Pronunciation seems secondary.

    Don't we have more important things to work on?

    ksjp

    On 8/7/2013 10:25 AM, Xavier Vilajosana Guillen wrote:
    HI all,

    I still like 6TSCH pronounced as Sixtus. In German can be pronounced as Sixtisch which is not difficult too.

    so my vote to keep it as Sixtus (6TSCH)

    sorry to be so classical :-)
    X


    On Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert <pascal.thubert@gmail.com> wrote:
    Dear all:

    Marc and Ted signaled us that the 6TSCH acronym could get us some bad press.
    It's hard to pronounce, many people did not get that we actually pronounce it sixtus.
    In one hand, the name was used already for quite a while to advertise this work outside, and all that marketing would have to be updated if we change the name now.
    OTON, if we change later, it will be a lot worse.

    What do people think? ¨Please shime in!

    also, we already have a number of candidates:
    - 6chants (IPv6 over Channel Hopping ANd Time Sliced links)
    - 6TiCS (IPv6 over Time-slotted Channel hopping Slots)
    - WiNOT (Wireless Networks for Operational Technology)
    - 6tis (TIme slotted Synchronized)
    - Witches (Wireless Time Channel Hopping Employing Slots)

    We're still looking for alternate good ideas. Please think hard and propose cool stuff!

    We'll discuss Friday on the opportunity and launch a poll over next week.

    Enjoy summer : )

    Pascal

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    https://www.ietf.org/mailman/listinfo/6tsch




    _______________________________________________
6tsch mailing list
6tsch@ietf.org
https://www.ietf.org/mailman/listinfo/6tsch

    --------------040201090707040406090803-- From alfredo.grieco@gmail.com Wed Aug 7 10:54:55 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3BAFD21E805F for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:54:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5oHFJn+vZWho for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 10:54:54 -0700 (PDT) Received: from mail-lb0-x229.google.com (mail-lb0-x229.google.com [IPv6:2a00:1450:4010:c04::229]) by ietfa.amsl.com (Postfix) with ESMTP id D880421F9DFC for <6tsch@ietf.org>; Wed, 7 Aug 2013 10:54:42 -0700 (PDT) Received: by mail-lb0-f169.google.com with SMTP id u10so1759372lbi.0 for <6tsch@ietf.org>; Wed, 07 Aug 2013 10:54:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=sSkJCP4bU1GKKBfsPQrek81gUP9NmpLwu3g1TYpVAgU=; b=MYTQZky2HQj4OVqlsmiJxAshJcUdOmqoMehzeLiEHVJWh2RipqPWLKTkuUsyIi3Ksb FL/fgWPSavf5gmMIzll9k5imhuidsbPu5XmgvKzmozlpBUyKF91OPBgdOFDanGRumguA GyovsPUsbYtoOCjlZ2nc9OQC+ULfN099kTGT5qzRRHRK0aUWVzdwCkD7kO/hacGh7JY9 plteCfXMqNODR7H8L76ejX5oiRhnAwxdh28h1tM1dim2edqB/THUJrdOji51b9dIOZB4 c7WyUIPYLPbBWasPx3fx7jf98McADT4J5bS2VUSJ1j4jlcrp7KKR72E3dXwO4+0qKn/x 9aOQ== MIME-Version: 1.0 X-Received: by 10.112.159.100 with SMTP id xb4mr651735lbb.91.1375898076898; Wed, 07 Aug 2013 10:54:36 -0700 (PDT) Received: by 10.114.79.103 with HTTP; Wed, 7 Aug 2013 10:54:36 -0700 (PDT) In-Reply-To: References: Date: Wed, 7 Aug 2013 19:54:36 +0200 Message-ID: From: Alfredo Grieco To: "xvilajosana@eecs.berkeley.edu" Content-Type: multipart/alternative; boundary=001a11c234e21eed6a04e35f3c81 Cc: Pascal Thubert , IETF 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 17:54:56 -0000 --001a11c234e21eed6a04e35f3c81 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable i fully agree to Xavi. Cheers. Alfredo On Wednesday, August 7, 2013, Xavier Vilajosana Guillen wrote: > HI all, > > I still like 6TSCH pronounced as Sixtus. In German can be pronounced as > Sixtisch which is not difficult too. > > so my vote to keep it as Sixtus (6TSCH) > > sorry to be so classical :-) > X > > > On Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert > > wrote: > >> Dear all: >> >> Marc and Ted signaled us that the 6TSCH acronym could get us some bad >> press. >> It's hard to pronounce, many people did not get that we actually >> pronounce it sixtus. >> In one hand, the name was used already for quite a while to advertise >> this work outside, and all that marketing would have to be updated if we >> change the name now. >> OTON, if we change later, it will be a lot worse. >> >> What do people think? =A8Please shime in! >> >> also, we already have a number of candidates: >> - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) >> - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) >> - WiNOT (Wireless Networks for Operational Technology) >> - 6tis (TIme slotted Synchronized) >> - Witches (Wireless Time Channel Hopping Employing Slots) >> >> We're still looking for alternate good ideas. Please think hard and >> propose cool stuff! >> >> We'll discuss Friday on the opportunity and launch a poll over next week= . >> >> Enjoy summer : ) >> >> Pascal >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > --001a11c234e21eed6a04e35f3c81 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable i fully agree to Xavi. Cheers. Alfredo

    On Wednesday, Au= gust 7, 2013, Xavier Vilajosana Guillen wrote:
    HI all,

    I still like 6TSCH pronounced as= Sixtus. In German can be pronounced as Sixtisch which is not difficult too= .

    so my vote to keep it as Sixtus (6TSCH)

    sorry t= o be so classical :-)
    X


    On= Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert <pascal.thubert@gmail.com> wrote:
    Dear all:

    Marc and Ted signaled us that the 6TSCH acronym could get us some bad pre= ss.
    It's hard to pronounce, many people did not get that we actually p= ronounce it sixtus.
    In one hand, the name was used already for quite a while to advertise = this work outside, and all that marketing would have to be updated if we ch= ange the name now.
    OTON, if we change later, it will be a lot wor= se.

    What do people think? =A8Please shime in!
    also, we already have a number of candidates:
    - 6chants=A0(IPv6 over = Channel Hopping ANd Time Sliced links)
    -=A06TiCS=A0(IPv6 over Time-slott= ed Channel hopping Slots)
    - WiNOT (Wireless Networks for Operational Technology)
    -=A06tis (TIme slotted Syn= chronized)
    = -=A0Witches (Wireless Time Channel Hopping Employing Slots)

    We're still looking for alternate good ideas. Pleas= e think hard and propose cool stuff!

    We'll dis= cuss Friday on the opportunity and launch a poll over next week.

    Enjoy summer : )

    Pasc= al

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --001a11c234e21eed6a04e35f3c81-- From qinwang@berkeley.edu Wed Aug 7 14:04:55 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CE99A21F9DD5 for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 14:04:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.826 X-Spam-Level: X-Spam-Status: No, score=-2.826 tagged_above=-999 required=5 tests=[AWL=0.150, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5eFl+8W6RIMS for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 14:04:45 -0700 (PDT) Received: from mail-ie0-f180.google.com (mail-ie0-f180.google.com [209.85.223.180]) by ietfa.amsl.com (Postfix) with ESMTP id DE64621F9D5E for <6tsch@ietf.org>; Wed, 7 Aug 2013 14:04:44 -0700 (PDT) Received: by mail-ie0-f180.google.com with SMTP id aq17so397799iec.39 for <6tsch@ietf.org>; Wed, 07 Aug 2013 14:04:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=HRxkrnYESZEEw4JOF5BOwCQOlhoorPP+yphRrbio3I4=; b=LnSgg78wyL5Stm565u1CjvTQRmORDJS7Aweh9APkF0H4HdTfyS5ppTZVnLwdn0/SyI bF9ULlC0tC7jlIxyOKZRYhzH/a5lWgXTmUx+a1fQh6eHCMYmUXPOv7gcSGlcFmVeUIz1 BBprdBeeb5pX5/irjnEUUDnBVJikLxCcZKR66zlpMSqveUzFOw6nxLYsDvXWCEiZP38y KVRiaGnBehkuGSIfkwYGKs9DRfn8kik1o8DqpBatI/+BXAXezHqLFXaTmcJYhdlIAbzW lFZpHscmBQRk4YpsoTDgPN8uzM/RI+IeeNMF+kjhO+NuMksSG4z5DPBd2FTFmTYEYVsQ SJ+Q== X-Gm-Message-State: ALoCoQkutm9vmd8LfhkL0FO1fpSeilGqOvxtGxXvzPzxpv9sDiOxQ5wKdaPP6bwTJqOBRHnmF+V9 MIME-Version: 1.0 X-Received: by 10.43.157.200 with SMTP id lr8mr638696icc.104.1375909484266; Wed, 07 Aug 2013 14:04:44 -0700 (PDT) Received: by 10.64.171.82 with HTTP; Wed, 7 Aug 2013 14:04:44 -0700 (PDT) In-Reply-To: References: Date: Thu, 8 Aug 2013 05:04:44 +0800 Message-ID: From: Qin Wang To: Xavier Vilajosana Guillen Content-Type: multipart/alternative; boundary=001a11c215480d983a04e361e42b Cc: Pascal Thubert , IETF 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 21:04:55 -0000 --001a11c215480d983a04e361e42b Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable +1 to 6TSCH. Qin On Thu, Aug 8, 2013 at 1:25 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > HI all, > > I still like 6TSCH pronounced as Sixtus. In German can be pronounced as > Sixtisch which is not difficult too. > > so my vote to keep it as Sixtus (6TSCH) > > sorry to be so classical :-) > X > > > On Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert wrote: > >> Dear all: >> >> Marc and Ted signaled us that the 6TSCH acronym could get us some bad >> press. >> It's hard to pronounce, many people did not get that we actually >> pronounce it sixtus. >> In one hand, the name was used already for quite a while to advertise >> this work outside, and all that marketing would have to be updated if we >> change the name now. >> OTON, if we change later, it will be a lot worse. >> >> What do people think? =A8Please shime in! >> >> also, we already have a number of candidates: >> - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) >> - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) >> - WiNOT (Wireless Networks for Operational Technology) >> - 6tis (TIme slotted Synchronized) >> - Witches (Wireless Time Channel Hopping Employing Slots) >> >> We're still looking for alternate good ideas. Please think hard and >> propose cool stuff! >> >> We'll discuss Friday on the opportunity and launch a poll over next week= . >> >> Enjoy summer : ) >> >> Pascal >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --001a11c215480d983a04e361e42b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    +1 to 6TSCH.

    Qin


    On Thu, Aug 8, 2013 at = 1:25 AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.= edu> wrote:
    HI all,

    I= still like 6TSCH pronounced as Sixtus. In German can be pronounced as Sixt= isch which is not difficult too.

    so my vote to keep it as Sixtus (6TSCH)

    sorry to be = so classical :-)
    X


    On Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert <pascal.thubert@gmail.com> wrote:
    Dear all:

    Marc and Ted signaled us that the 6TS= CH acronym could get us some bad press.
    It's hard to pronounce, many people did not get that we actually p= ronounce it sixtus.
    In one hand, the name was used already for quite a while to advertise = this work outside, and all that marketing would have to be updated if we ch= ange the name now.
    OTON, if we change later, it will be a lot wor= se.

    What do people think? =A8Please shime in!
    also, we already have a number of candidates:
    - 6chants=A0(IPv6 over = Channel Hopping ANd Time Sliced links)
    -=A06TiCS=A0(IPv6 over Time-slott= ed Channel hopping Slots)
    - WiNOT (Wireless Networks for Operational Technology)
    -=A06tis (TIme slotted Syn= chronized)
    = -=A0Witches (Wireless Time Channel Hopping Employing Slots)

    We're still looking for alternate good ideas. Pleas= e think hard and propose cool stuff!

    We'll dis= cuss Friday on the opportunity and launch a poll over next week.

    Enjoy summer : )

    Pasc= al

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --001a11c215480d983a04e361e42b-- From cabo@tzi.org Wed Aug 7 14:44:03 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B24CF21E8099 for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 14:44:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.249 X-Spam-Level: X-Spam-Status: No, score=-106.249 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HELO_EQ_DE=0.35, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0b-YvU5iYprF for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 14:43:58 -0700 (PDT) Received: from informatik.uni-bremen.de (mailhost.informatik.uni-bremen.de [IPv6:2001:638:708:30c9::12]) by ietfa.amsl.com (Postfix) with ESMTP id 35E4311E80A2 for <6tsch@ietf.org>; Wed, 7 Aug 2013 14:43:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at informatik.uni-bremen.de Received: from smtp-fb3.informatik.uni-bremen.de (smtp-fb3.informatik.uni-bremen.de [134.102.224.120]) by informatik.uni-bremen.de (8.14.4/8.14.4) with ESMTP id r77Lhm69017895; Wed, 7 Aug 2013 23:43:48 +0200 (CEST) Received: from [192.168.217.105] (p5489221B.dip0.t-ipconnect.de [84.137.34.27]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp-fb3.informatik.uni-bremen.de (Postfix) with ESMTPSA id 94ACAA93; Wed, 7 Aug 2013 23:43:48 +0200 (CEST) Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) Content-Type: text/plain; charset=iso-8859-1 From: Carsten Bormann In-Reply-To: <2650.1375896221@sandelman.ca> Date: Wed, 7 Aug 2013 23:43:47 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <0375508E-6F4B-4878-8A18-BCE315FD5D5F@tzi.org> References: <2650.1375896221@sandelman.ca> To: Michael Richardson X-Mailer: Apple Mail (2.1508) Cc: IETF 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 21:44:03 -0000 On Aug 7, 2013, at 19:23, Michael Richardson = wrote: > So, why not call it that? Because of a lack of cultural background on my own (there is no problem = with the German word "Tisch"), I cannot supply the details here, but = this appears to be about avoiding a naming accident. (Lookup up the Mitsubishi Pajero if "naming accident" doesn't strike a = bell.) So if someone says we better shouldn't use that name, let's take that at = face value, and look for something else. Gr=FC=DFe, Carsten From ksjp@berkeley.edu Wed Aug 7 15:01:07 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1EFC321E815A for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 15:01:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.599 X-Spam-Level: X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[AWL=0.001, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id D3qUO--WSuLr for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 15:01:02 -0700 (PDT) Received: from mail-pa0-f53.google.com (mail-pa0-f53.google.com [209.85.220.53]) by ietfa.amsl.com (Postfix) with ESMTP id 4680621E80A9 for <6tsch@ietf.org>; Wed, 7 Aug 2013 15:00:49 -0700 (PDT) Received: by mail-pa0-f53.google.com with SMTP id lb1so2664337pab.12 for <6tsch@ietf.org>; Wed, 07 Aug 2013 15:00:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type :content-transfer-encoding; bh=eJ2MnkDS9WnsqDMxTyF5HWPo2tsOiQx525YA+a++4Pk=; b=aQj+jO0zwnc93O3mCWrT+/u9yju3+O2iNlrAnZ3uIzByNC7J/hwn+rgZEXPiax9Jqa QbxM/EH11dYRIPnyWk51D8bt51jOzZi2QTpAIBIEtFdBv7WKC5PzuhhfjAymoIAnRjMw 8WrpQIzxjwHXhRvCAR3Y42KS6eOKXQeAzDLtNThDztdBEs2dCYPd8tH/yLE3pcAF+gS0 Cz3u5XfVgz0vjibXpP6pzaouKfj2LQVqmq4nFM18lNvy9kE3BLlXw7rudFZDjsXqpo9Y gupUl7nmn6qH6jkq8iUkF2nlctJerekKdrii1LZsTvzl9qq+si1/2H9Pzrmx8zhoRjoW ylGg== X-Gm-Message-State: ALoCoQniBD56UTS6yOIE51EBHMK2N9VkxHV8sfIpBYRJuoukw+umKCYCjmiyzWvYLm54E2FrC09A X-Received: by 10.68.107.226 with SMTP id hf2mr2858242pbb.28.1375912848853; Wed, 07 Aug 2013 15:00:48 -0700 (PDT) Received: from [10.70.40.32] ([134.24.149.4]) by mx.google.com with ESMTPSA id iu7sm10278178pbc.8.2013.08.07.15.00.47 for <6tsch@ietf.org> (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 07 Aug 2013 15:00:48 -0700 (PDT) Message-ID: <5202C38B.8070809@berkeley.edu> Date: Wed, 07 Aug 2013 15:00:43 -0700 From: Kris Pister User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: 6tsch@ietf.org References: <2650.1375896221@sandelman.ca> <0375508E-6F4B-4878-8A18-BCE315FD5D5F@tzi.org> In-Reply-To: <0375508E-6F4B-4878-8A18-BCE315FD5D5F@tzi.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 22:01:07 -0000 If there is some naming accident then we should get at least an oblique pointer to what the problem is before changing the name of the group. ksjp On 8/7/2013 2:43 PM, Carsten Bormann wrote: > [...] So if someone says we better shouldn't use that name, let's > take that at face value, and look for something else. Grüße, Carsten > _______________________________________________ 6tsch mailing list > 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch From nordmark@cisco.com Wed Aug 7 15:16:43 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8DDD411E815C for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 15:16:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.599 X-Spam-Level: X-Spam-Status: No, score=-10.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ruijH6rWF-0j for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 15:16:39 -0700 (PDT) Received: from mtv-iport-2.cisco.com (mtv-iport-2.cisco.com [173.36.130.13]) by ietfa.amsl.com (Postfix) with ESMTP id 3234C21F9B8D for <6tsch@ietf.org>; Wed, 7 Aug 2013 15:16:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=766; q=dns/txt; s=iport; t=1375913799; x=1377123399; h=message-id:date:from:mime-version:to:cc:subject: references:in-reply-to:content-transfer-encoding; bh=ehjxG5fAqsV9jTczJsDE7Sh9SuTylieAIK3PbngCJp8=; b=KM7Ek7BDJN7nqT1viHQzB99UoFGgmAAjVxGqjKFjt5nOfmAZjCO9hJZd bryFi7RZG3XFjZ6UTgL8/ENByIohcrYDkyPh2fr58K3TKI2pumgcwzGhD G7BPtvlncMm21iM1r4bXLmkT87TjImV14CpAlROs8n0I4CnTZqfDBEgHN E=; X-IronPort-AV: E=Sophos;i="4.89,835,1367971200"; d="scan'208";a="88651524" Received: from mtv-core-3.cisco.com ([171.68.58.8]) by mtv-iport-2.cisco.com with ESMTP; 07 Aug 2013 22:16:38 +0000 Received: from [10.21.84.198] (sjc-vpn4-1223.cisco.com [10.21.84.198]) by mtv-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id r77MGZF3026148; Wed, 7 Aug 2013 22:16:36 GMT Message-ID: <5202C72A.5060305@cisco.com> Date: Thu, 08 Aug 2013 00:16:10 +0200 From: Erik Nordmark User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 MIME-Version: 1.0 To: Kris Pister References: <2650.1375896221@sandelman.ca> <0375508E-6F4B-4878-8A18-BCE315FD5D5F@tzi.org> <5202C38B.8070809@berkeley.edu> In-Reply-To: <5202C38B.8070809@berkeley.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Cc: 6tsch@ietf.org Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 22:16:43 -0000 On 8/8/13 12:00 AM, Kris Pister wrote: > If there is some naming accident then we should get at least an oblique > pointer to what the problem is before changing the name of the group. The issue seems to be that 6TSCH could be pronounced six-tush instead of sixtus. Erik > ksjp > > On 8/7/2013 2:43 PM, Carsten Bormann wrote: >> [...] So if someone says we better shouldn't use that name, let's >> take that at face value, and look for something else. Grüße, Carsten >> _______________________________________________ 6tsch mailing list >> 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch From maria-rita.palattella@uni.lu Wed Aug 7 16:03:56 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9C0CB11E817B for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 16:03:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.598 X-Spam-Level: X-Spam-Status: No, score=-6.598 tagged_above=-999 required=5 tests=[AWL=0.001, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id m1stzBIrb2wZ for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 16:03:46 -0700 (PDT) Received: from hercules.uni.lu (hercules.uni.lu [158.64.76.33]) by ietfa.amsl.com (Postfix) with ESMTP id 7940611E8171 for <6tsch@ietf.org>; Wed, 7 Aug 2013 16:03:41 -0700 (PDT) X-IronPort-AV: E=Sophos;i="4.89,835,1367964000"; d="scan'208";a="25806416" Received: from unknown (HELO Archer.uni.lux) ([10.21.2.1]) by hercules.uni.lu with ESMTP; 08 Aug 2013 01:03:39 +0200 Received: from HOSHI.uni.lux ([fe80::499:a33:4e68:4af9]) by Archer.uni.lux ([fe80::1009:b1e7:2b72:f0b8%10]) with mapi id 14.03.0123.003; Thu, 8 Aug 2013 01:03:39 +0200 From: Maria Rita PALATTELLA To: Kris Pister , "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: [6tsch] (not) Renaming 6TSCH Thread-Index: AQHOk5T9dZ/tDKUzYkSzku1Eip/HwpmKXV3e Date: Wed, 7 Aug 2013 23:03:38 +0000 Message-ID: References: , <52028620.1090605@berkeley.edu> In-Reply-To: <52028620.1090605@berkeley.edu> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.34.0.9] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [6tsch] (not) Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 23:03:56 -0000 +1 for 6TSCH=20 Maria Rita ________________________________________ From: 6tsch-bounces@ietf.org [6tsch-bounces@ietf.org] on behalf of Kris Pis= ter [ksjp@berkeley.edu] Sent: Wednesday, August 07, 2013 7:38 PM To: 6tsch@ietf.org Subject: [6tsch] (not) Renaming 6TSCH I agree with Xavi. 6tsch is descriptive of exactly what we're doing, and I= think that we should keep it. Pronunciation seems secondary. Don't we have more important things to work on? ksjp On 8/7/2013 10:25 AM, Xavier Vilajosana Guillen wrote: HI all, I still like 6TSCH pronounced as Sixtus. In German can be pronounced as Six= tisch which is not difficult too. so my vote to keep it as Sixtus (6TSCH) sorry to be so classical :-) X On Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert > wrote: Dear all: Marc and Ted signaled us that the 6TSCH acronym could get us some bad press= . It's hard to pronounce, many people did not get that we actually pronounce = it sixtus. In one hand, the name was used already for quite a while to advertise this = work outside, and all that marketing would have to be updated if we change = the name now. OTON, if we change later, it will be a lot worse. What do people think? =A8Please shime in! also, we already have a number of candidates: - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) - WiNOT (Wireless Networks for Operational Technology) - 6tis (TIme slotted Synchronized) - Witches (Wireless Time Channel Hopping Employing Slots) We're still looking for alternate good ideas. Please think hard and propose= cool stuff! We'll discuss Friday on the opportunity and launch a poll over next week. Enjoy summer : ) Pascal _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch From diego.dujovne@mail.udp.cl Wed Aug 7 16:14:07 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 05BD811E8171 for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 16:14:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5rjkf5qRz4eR for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 16:14:02 -0700 (PDT) Received: from mail-we0-f180.google.com (mail-we0-f180.google.com [74.125.82.180]) by ietfa.amsl.com (Postfix) with ESMTP id 7450011E8178 for <6tsch@ietf.org>; Wed, 7 Aug 2013 16:14:02 -0700 (PDT) Received: by mail-we0-f180.google.com with SMTP id p61so2075689wes.11 for <6tsch@ietf.org>; Wed, 07 Aug 2013 16:14:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=xuyhYqVFOenPo+kX7roRS1JfqMx35WivA0gJ1H+WnZM=; b=Y1kyfUvif/e0aC70RXzcYj35nTHZcPOFacuIBaFg5PgvgoayHOje/fIOCVqJADwfNq 13I330JXZFtT341WqdZ9JAyke61mLXh+sk8H3begnADdYSalljSC9R88xrH7JFtDofln 699sCgGprOpEZz+I/7UUVeYKoc/lGoio98wEALG7LbWHLDMRdPlzZFwmwmdMaKNpHOI/ OhpXBm8DdsW8LoD9IWfhXfyk3KU1JyEYHOPbDqz/dSGYOkLCuhTssNIw1TkwjWIDt7nO ySJtGldmyH7Q6OH6uOA0BW+uKZ8i/pB93mEFzmhRJsS0nW5UaV16DmOjp3hq7yfzeAm1 inmw== X-Gm-Message-State: ALoCoQkFp3meoTbsgtCrlMmMOx/86dmqKV5jjZsXL9JLuDVqoKkDN9pMJ3Zh/Fpxzsk61dMjTVKm MIME-Version: 1.0 X-Received: by 10.194.242.134 with SMTP id wq6mr1653021wjc.94.1375917241262; Wed, 07 Aug 2013 16:14:01 -0700 (PDT) Received: by 10.194.122.138 with HTTP; Wed, 7 Aug 2013 16:14:01 -0700 (PDT) In-Reply-To: References: <52028620.1090605@berkeley.edu> Date: Wed, 7 Aug 2013 19:14:01 -0400 Message-ID: From: "Prof. Diego Dujovne" To: Maria Rita PALATTELLA Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Kris Pister , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] (not) Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2013 23:14:07 -0000 I agree with 6TSCH. Diego Dujovne 2013/8/7 Maria Rita PALATTELLA : > +1 for 6TSCH > Maria Rita > ________________________________________ > From: 6tsch-bounces@ietf.org [6tsch-bounces@ietf.org] on behalf of Kris P= ister [ksjp@berkeley.edu] > Sent: Wednesday, August 07, 2013 7:38 PM > To: 6tsch@ietf.org > Subject: [6tsch] (not) Renaming 6TSCH > > I agree with Xavi. 6tsch is descriptive of exactly what we're doing, and= I think that we should keep it. > Pronunciation seems secondary. > > Don't we have more important things to work on? > > ksjp > > On 8/7/2013 10:25 AM, Xavier Vilajosana Guillen wrote: > HI all, > > I still like 6TSCH pronounced as Sixtus. In German can be pronounced as S= ixtisch which is not difficult too. > > so my vote to keep it as Sixtus (6TSCH) > > sorry to be so classical :-) > X > > > On Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert > wrote: > Dear all: > > Marc and Ted signaled us that the 6TSCH acronym could get us some bad pre= ss. > It's hard to pronounce, many people did not get that we actually pronounc= e it sixtus. > In one hand, the name was used already for quite a while to advertise thi= s work outside, and all that marketing would have to be updated if we chang= e the name now. > OTON, if we change later, it will be a lot worse. > > What do people think? =A8Please shime in! > > also, we already have a number of candidates: > - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) > - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) > - WiNOT (Wireless Networks for Operational Technology) > - 6tis (TIme slotted Synchronized) > - Witches (Wireless Time Channel Hopping Employing Slots) > > We're still looking for alternate good ideas. Please think hard and propo= se cool stuff! > > We'll discuss Friday on the opportunity and launch a poll over next week. > > Enjoy summer : ) > > Pascal > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch --=20 DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 From mehdi.sabzevari@yahoo.com Wed Aug 7 23:13:17 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7E01411E80D7 for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 23:13:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wa+lIliIjf0U for <6tsch@ietfa.amsl.com>; Wed, 7 Aug 2013 23:13:12 -0700 (PDT) Received: from nm16-vm2.bullet.mail.ne1.yahoo.com (nm16-vm2.bullet.mail.ne1.yahoo.com [98.138.91.92]) by ietfa.amsl.com (Postfix) with ESMTP id A9E8A11E80DF for <6tsch@ietf.org>; Wed, 7 Aug 2013 23:13:11 -0700 (PDT) Received: from [98.138.90.54] by nm16.bullet.mail.ne1.yahoo.com with NNFMP; 08 Aug 2013 06:13:10 -0000 Received: from [98.138.101.170] by tm7.bullet.mail.ne1.yahoo.com with NNFMP; 08 Aug 2013 06:13:10 -0000 Received: from [127.0.0.1] by omp1081.mail.ne1.yahoo.com with NNFMP; 08 Aug 2013 06:13:10 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 466489.28826.bm@omp1081.mail.ne1.yahoo.com Received: (qmail 55839 invoked by uid 60001); 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Wed, 07 Aug 2013 23:13:09 PDT X-Rocket-MIMEInfo: 002.001, SSBhZ3JlZSB3aXRoIDZUU0NICgpNZWhkaQoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCiBGcm9tOiBRaW4gV2FuZyA8cWlud2FuZ0BiZXJrZWxleS5lZHU.ClRvOiBYYXZpZXIgVmlsYWpvc2FuYSBHdWlsbGVuIDx4dmlsYWpvc2FuYUBlZWNzLmJlcmtlbGV5LmVkdT4gCkNjOiBQYXNjYWwgVGh1YmVydCA8cGFzY2FsLnRodWJlcnRAZ21haWwuY29tPjsgSUVURiA2VFNDSCA8NnRzY2hAaWV0Zi5vcmc.IApTZW50OiBUaHVyc2RheSwgQXVndXN0IDgsIDIwMTMgMTozNCBBTQpTdWJqZWN0OiBSZToBMAEBAQE- X-Mailer: YahooMailWebService/0.8.152.567 References: Message-ID: <1375942389.51363.YahooMailNeo@web121105.mail.ne1.yahoo.com> Date: Wed, 7 Aug 2013 23:13:09 -0700 (PDT) From: mehdi sabzevari To: Qin Wang , Xavier Vilajosana Guillen In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="1018116533-1770769250-1375942389=:51363" Cc: Pascal Thubert , IETF 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: mehdi sabzevari List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Aug 2013 06:13:17 -0000 --1018116533-1770769250-1375942389=:51363 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable I agree with 6TSCH=0A=0AMehdi=0A=0A=0A________________________________=0A F= rom: Qin Wang =0ATo: Xavier Vilajosana Guillen =0ACc: Pascal Thubert ;= IETF 6TSCH <6tsch@ietf.org> =0ASent: Thursday, August 8, 2013 1:34 AM=0ASu= bject: Re: [6tsch] Renaming 6TSCH=0A =0A=0A=0A+1 to 6TSCH.=0A=0AQin=0A=0A= =0A=0AOn Thu, Aug 8, 2013 at 1:25 AM, Xavier Vilajosana Guillen wrote:=0A=0AHI all, =0A>=0A>I still like 6TSCH pronoun= ced as Sixtus. In German can be pronounced as Sixtisch which is not difficu= lt too.=0A>=0A>so my vote to keep it as Sixtus (6TSCH)=0A>=0A>sorry to be s= o classical :-)=0A>X=0A>=0A>=0A>=0A>=0A>On Wed, Aug 7, 2013 at 10:03 AM, Pa= scal Thubert wrote:=0A>=0A>Dear all:=0A>>=0A>>= =0A>>Marc and Ted signaled us that the 6TSCH acronym could get us some bad = press.=0A>>It's hard to pronounce, many people did not get that we actually= pronounce it sixtus.=0A>>In one hand, the name was used already for quite = a while to advertise this work outside, and all that marketing would have t= o be updated if we change the name now.=0A>>OTON, if we change later, it wi= ll be a lot worse.=0A>>=0A>>=0A>>What do people think? =A8Please shime in!= =0A>>=0A>>=0A>>also, we already have a number of candidates:=0A>>- 6chants= =A0(IPv6 over Channel Hopping ANd Time Sliced links)=0A>>-=A06TiCS=A0(IPv6 = over Time-slotted Channel hopping Slots)=0A>>- WiNOT (Wireless Networks for= Operational Technology)=0A>>=0A>>-=A06tis (TIme slotted Synchronized)=0A>>= -=A0Witches (Wireless Time Channel Hopping Employing Slots)=0A>>=0A>>=0A>>W= e're still looking for alternate good ideas. Please think hard and propose = cool stuff!=0A>>=0A>>=0A>>We'll discuss Friday on the opportunity and launc= h a poll over next week.=0A>>=0A>>=0A>>Enjoy summer : )=0A>>Pascal =0A>>___= ____________________________________________=0A>>6tsch mailing list=0A>>6ts= ch@ietf.org=0A>>https://www.ietf.org/mailman/listinfo/6tsch=0A>>=0A>>=0A>= =0A>_______________________________________________=0A>6tsch mailing list= =0A>6tsch@ietf.org=0A>https://www.ietf.org/mailman/listinfo/6tsch=0A>=0A>= =0A=0A_______________________________________________=0A6tsch mailing list= =0A6tsch@ietf.org=0Ahttps://www.ietf.org/mailman/listinfo/6tsch --1018116533-1770769250-1375942389=:51363 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
    I agree wi= th 6TSCH

    M= ehdi

    From: Qin Wang <qinwang@berkeley.edu&g= t;
    To: Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu>
    Cc: Pascal Thubert <pascal.thubert@gmail.com>; IETF = 6TSCH <6tsch@ietf.org>
    Sen= t: Thursday, August 8, 2013 1:34 AM
    Subject: Re: [6tsch] Renaming 6TSCH

    +1 to 6TSCH.

    Qin


    On Thu= , Aug 8, 2013 at 1:25 AM, Xavier Vilajosana Guillen <<= a rel=3D"nofollow" ymailto=3D"mailto:xvilajosana@eecs.berkeley.edu" target= =3D"_blank" href=3D"mailto:xvilajosana@eecs.berkeley.edu">xvilajosana@eecs.= berkeley.edu> wrote:
    =0A
    HI all,

    I still like 6TSCH pr= onounced as Sixtus. In German can be pronounced as Sixtisch which is not di= fficult too.
    =0A
    so my vote to keep it as Sixtus (6TSCH)
    sorry to be so classical :-)
    =0AX


    On Wed, Aug 7, 2013 at 10:03 AM, Pascal Thubert = <pasca= l.thubert@gmail.com> wrote:
    =0A=0A
    Dear all:

    Marc and Ted signaled us that the 6= TSCH acronym could get us some bad press.
    =0A=0A
    It's hard to pron= ounce, many people did not get that we actually pronounce it sixtus.
    = =0A
    In one hand, the name was used already for quite a while to adverti= se this work outside, and all that marketing would have to be updated if we= change the name now.
    OTON, if we change later, it will be a lot = worse.
    =0A=0A=0A

    What do people think? =A8Please sh= ime in!

    also, we already have a number of candidat= es:
    - 6chants (IPv6 over Channel Hopping ANd Time Sliced links)
    = =0A=0A=0A
    -&= nbsp;6TiCS (= IPv6 over Time-slotted Channel hopping Slots)
    =0A=0A=0A- WiNOT (Wireless Networks= for Operational Technology)
    - 6tis (TIme slotted Synchronized)
    - Witches= (Wireless Time Channel Hopping Employing Slots)
    =0A=0A=0A

    We're still looking for alternate good ideas. Please think hard and= propose cool stuff!

    We'll discuss Friday on the o= pportunity and launch a poll over next week.
    =0A=0A
    =0A
    <= div>Enjoy summer : )

    Pascal=0A
    =0A
    ____________________________________= ___________
    =0A6tsch mailing list
    =0A6tsc= h@ietf.org
    =0Ahttps://www.ietf.org/mailman/listinfo/= 6tsch
    =0A

    =0A
    ___________________= ____________________________
    =0A6tsch mailing list
    =0A6tsch@ietf.org
    =0Ahttps://www.ietf.org/= mailman/listinfo/6tsch
    =0A

    _______________________________________________
    6tsch mailing list
    <= a ymailto=3D"mailto:6tsch@ietf.org" href=3D"mailto:6tsch@ietf.org">6tsch@ie= tf.org
    https://www.ietf.org/mailman/listinfo/6tsch


    --1018116533-1770769250-1375942389=:51363-- From P.Zand@utwente.nl Thu Aug 8 01:28:51 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EE87511E810F for <6tsch@ietfa.amsl.com>; Thu, 8 Aug 2013 01:28:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.503 X-Spam-Level: X-Spam-Status: No, score=-0.503 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rMYIv+QwkMrr for <6tsch@ietfa.amsl.com>; Thu, 8 Aug 2013 01:28:44 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 24D5021E8050 for <6tsch@ietf.org>; Thu, 8 Aug 2013 01:28:43 -0700 (PDT) Received: from EXHUB02.ad.utwente.nl (130.89.4.229) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Thu, 8 Aug 2013 10:28:45 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB02.ad.utwente.nl ([130.89.4.229]) with mapi id 14.02.0328.009; Thu, 8 Aug 2013 10:28:42 +0200 From: To: , <6tsch@ietf.org> Thread-Topic: [6tsch] Renaming 6TSCH Thread-Index: AQHOk5AJ2YCn/ZcfRUG/PP/+qI1Kl5mK+s8g Date: Thu, 8 Aug 2013 08:28:41 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6D51C@EXMBX23.ad.utwente.nl> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6D51CEXMBX23adutwent_" MIME-Version: 1.0 Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Aug 2013 08:28:51 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6D51CEXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear All, As it is mentioned in the charter, we intend to use IEEE802.15.4e Time slot= ted Channel Hopping (TSCH) in L2. If we change the group name from 6TSCH to= other name like 6TiCS, 6chants, or ..., it might be easy to pronounce, but= for sure it will cause more confusion later. Because sometimes we named "T= ime slotted Channel Hopping" concept "TSCH" and sometimes "TiCS" (i.e. Time= -slotted Channel hopping Slots). For sure, we don't intend to change TSCH abbreviation in IEEE 802.15.4e sta= ndard. Am I right? So, +1 to 6TSCH. Best Wishes, Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of P= ascal Thubert Sent: Wednesday, August 07, 2013 7:03 PM To: IETF 6TSCH Subject: [6tsch] Renaming 6TSCH Dear all: Marc and Ted signaled us that the 6TSCH acronym could get us some bad press= . It's hard to pronounce, many people did not get that we actually pronounce = it sixtus. In one hand, the name was used already for quite a while to advertise this = work outside, and all that marketing would have to be updated if we change = the name now. OTON, if we change later, it will be a lot worse. What do people think? =A8Please shime in! also, we already have a number of candidates: - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) - WiNOT (Wireless Networks for Operational Technology) - 6tis (TIme slotted Synchronized) - Witches (Wireless Time Channel Hopping Employing Slots) We're still looking for alternate good ideas. Please think hard and propose= cool stuff! We'll discuss Friday on the opportunity and launch a poll over next week. Enjoy summer : ) Pascal --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6D51CEXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Dear All,

    As it is mentioned in the= charter, we intend to use IEEE802.15.4e Time slotted Channel Hopping (TSCH= ) in L2. If we change the group name from 6TSCH to other name like 6TiCS, 6chants, or …, it might be easy to pronounce, but f= or sure it will cause more confusion later. Because sometimes we named “Time slotted= Channel Hopping” concept “TSCH” and sometimes “TiC= S” (i.e. Time-slotted Channel hopping Slots).

    For sure, we don’t = intend to change TSCH abbreviation in IEEE 802.15.4e standard.

    Am I right?

     <= /p>

    So, +1 to 6TSCH.&n= bsp;  

     <= /p>

    Best Wishes,

    Pouria<= /p>

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Pascal Thubert
    Sent: Wednesday, August 07, 2013 7:03 PM
    To: IETF 6TSCH
    Subject: [6tsch] Renaming 6TSCH

     

    Dear all:

     

    Marc and Ted signaled us that the 6TSCH acronym coul= d get us some bad press.

    It's hard to pronounce, many people did not get that= we actually pronounce it sixtus.

    In one hand, the name was used already for quite a w= hile to advertise this work outside, and all that marketing would have to b= e updated if we change the name now.

    OTON, if we change later, it will be a lot worse.

     

    What do people think? =A8Please shime in!=

     

    also, we already have a number of candidates:

    - 6chants (IPv6 over Channel Hopping= ANd Time Sliced links)

    - 6TiCS (IPv6 over Time-slotted Channel hopping Slots)

    - WiNOT (Wireless Networks for Operationa= l Technology)

    - 6tis (TIme slotted Synchronized)

    - Witches (Wireless Time Channel Hop= ping Employing Slots)

     

    We're still looking for alternate good ideas. Please= think hard and propose cool stuff!

     

    We'll discuss Friday on the opportunity and launch a= poll over next week.

     

    Enjoy summer : )


    Pascal

    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6D51CEXMBX23adutwent_-- From guillaume.gaillard.maze@gmail.com Thu Aug 8 02:07:20 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 87D9511E81B8 for <6tsch@ietfa.amsl.com>; Thu, 8 Aug 2013 02:07:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Lw00kNYcwX8G for <6tsch@ietfa.amsl.com>; Thu, 8 Aug 2013 02:07:19 -0700 (PDT) Received: from mail-wi0-x231.google.com (mail-wi0-x231.google.com [IPv6:2a00:1450:400c:c05::231]) by ietfa.amsl.com (Postfix) with ESMTP id 8007A11E8115 for <6tsch@ietf.org>; Thu, 8 Aug 2013 02:07:18 -0700 (PDT) Received: by mail-wi0-f177.google.com with SMTP id hq12so326072wib.10 for <6tsch@ietf.org>; Thu, 08 Aug 2013 02:07:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=4pOVk6SD5GUwqXsAnyRZCU+0Q6wXLbc22h7YkYPJpGg=; b=a3YaTDsGZjNbeIDLcrid8IOkaI1zJTGwlbO3ObckbynYrA+Ksh01hwpZzXtj0qPbo1 qaIW5km36QPgSDiiFSnSsSjrJHUxyAcz+yGZgRlbxARrC9NG6u9MKpfCmz2HW/CjEpN4 HbkmlAJCO0n157xuUdrf+gTU2Cm0Ri6PGc5XbwUAwvnfkKlVse5bRtxjTGdqdHv7Z1CV 6GG7UA3XKKZZEC6K0pDHzKmjEF1kbAIM/RymTaUCa9YAVwkYWsZ290qwP/kkiOrmqKHV CZbX66qjfNWFw/C3vVrFYaBzcp3Ogp6jcSr1I20nyoqlpFus118FW5AleAVPB7w1EdgY 32vg== MIME-Version: 1.0 X-Received: by 10.180.9.69 with SMTP id x5mr4497341wia.41.1375952837425; Thu, 08 Aug 2013 02:07:17 -0700 (PDT) Received: by 10.217.114.8 with HTTP; Thu, 8 Aug 2013 02:07:17 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6D51C@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6D51C@EXMBX23.ad.utwente.nl> Date: Thu, 8 Aug 2013 11:07:17 +0200 Message-ID: From: Guillaume Gaillard To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=001a11c24c161a3f7a04e36bfc9a Subject: Re: [6tsch] Renaming 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Aug 2013 09:07:20 -0000 --001a11c24c161a3f7a04e36bfc9a Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Dear all, I also think that it is better to keep going with 6tsch : - The dificult pronunciation creates curiosity, and it makes it easier to remember once you get it right. - It is a good pretext to explain what is the WG about : "Are you going to the sixtus BOF ? Which one ? 6tsch, you know, 6. T. S. C. H., meaning IPv6 over TSCH, etc. "; - Tisch isn't "table" in German ? I don't understand why this is a problem. Some translations even give the word "board", which matches with 6tsch schedule; - People are already using 6tsch; - All the reasons previously cited. Regards, Guillaume 2013/8/8 > Dear All,**** > > As it is mentioned in the charter, we intend to use IEEE802.15.4e Time > slotted Channel Hopping (TSCH) in L2. If we change the group name from > 6TSCH to other name like 6TiCS, 6chants, or =85, it might be easy to > pronounce, but for sure it will cause *more confusion later*. Because > sometimes we named =93Time slotted Channel Hopping=94 concept =93TSCH=94 = and > sometimes =93TiCS=94 (i.e. Time-slotted Channel hopping Slots). **** > > For sure, we don=92t intend to change TSCH abbreviation in IEEE 802.15.4e > standard.**** > > Am I right?**** > > ** ** > > *So, +1 to 6TSCH. * > > ** ** > > Best Wishes,**** > > Pouria**** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Pascal Thubert > *Sent:* Wednesday, August 07, 2013 7:03 PM > *To:* IETF 6TSCH > *Subject:* [6tsch] Renaming 6TSCH**** > > ** ** > > Dear all:**** > > ** ** > > Marc and Ted signaled us that the 6TSCH acronym could get us some bad > press.**** > > It's hard to pronounce, many people did not get that we actually pronounc= e > it sixtus.**** > > In one hand, the name was used already for quite a while to advertise thi= s > work outside, and all that marketing would have to be updated if we chang= e > the name now.**** > > OTON, if we change later, it will be a lot worse.**** > > ** ** > > What do people think? =A8Please shime in!**** > > ** ** > > also, we already have a number of candidates:**** > > - 6chants (IPv6 over Channel Hopping ANd Time Sliced links)**** > > - 6TiCS (IPv6 over Time-slotted Channel hopping Slots)**** > > - WiNOT (Wireless Networks for Operational Technology)**** > > - 6tis (TIme slotted Synchronized)**** > > - Witches (Wireless Time Channel Hopping Employing Slots)**** > > ** ** > > We're still looking for alternate good ideas. Please think hard and > propose cool stuff!**** > > ** ** > > We'll discuss Friday on the opportunity and launch a poll over next week.= * > *** > > ** ** > > Enjoy summer : )**** > > > Pascal **** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --001a11c24c161a3f7a04e36bfc9a Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Dear all,=A0
    I also think that it is better to keep go= ing with 6tsch :
    - The dificult pronunciation creates curiosity, = and it makes it easier to remember once you get it right.
    - It is= a good pretext to explain what is the WG about : "Are you going to th= e sixtus BOF ? Which one ? 6tsch, you know, 6. T. S. C. H., meaning IPv6 ov= er TSCH, etc. ";
    - Tisch isn't "table" in German ? I don't understand= why this is a problem. Some translations even give the word "board&qu= ot;, which matches with 6tsch schedule;
    - People are already usin= g 6tsch;
    - All the reasons previously cited.

    Regards,<= /div>

    Guillaume

    2013/8/8 <P.Zand@utwente.nl>

    Dear All,

    As it is mentioned in the= charter, we intend to use IEEE802.15.4e Time slotted Channel Hopping (TSCH= ) in L2. If we change the group name from 6TSCH to other name like 6TiCS, 6chants, or =85, it might be easy to pronounce, but for s= ure it will cause more confusion later. Because sometimes we named =93Time slotted Cha= nnel Hopping=94 concept =93TSCH=94 and sometimes =93TiCS=94 (i.e. Time-slot= ted Channel hopping Slots).

    For sure, we don=92t inte= nd to change TSCH abbreviation in IEEE 802.15.4e standard.

    Am I right?=

    =A0<= /p>

    So, +1 to 6TSCH.=A0=A0= =A0

    =A0<= /p>

    Best Wishes,

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Pascal Thubert
    Sent: Wednesday, August 07, 2013 7:03 PM
    To: IETF 6TSCH
    Subject: [6tsch] Renaming 6TSCH

    =A0

    Dear all:

    =A0

    Marc and Ted signaled us that the 6TSCH acronym coul= d get us some bad press.

    It's hard to pronounce, many people did not get = that we actually pronounce it sixtus.

    In one hand, the name was used already for quite a w= hile to advertise this work outside, and all that marketing would have to b= e updated if we change the name now.

    OTON, if we change later, it will be a lot worse.=

    =A0

    What do people think? =A8Please shime in!<= /u>

    =A0

    also, we already have a number of candidates:=

    - 6chants=A0(IPv6 over Channel Hopping AN= d Time Sliced links)

    -=A06T= iCS=A0(IPv6 over Time-slotted Channel hopping Slots)

    - WiNOT (Wireless Networks for Operationa= l Technology)

    -=A06tis (TIme slotted Synchronized)

    -=A0Witches (Wireless Time Channel Hoppin= g Employing Slots)

    =A0

    We're still looking for alternate good ideas. Pl= ease think hard and propose cool stuff!

    =A0

    We'll discuss Friday on the opportunity and laun= ch a poll over next week.

    =A0

    Enjoy summer : )


    Pascal


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --001a11c24c161a3f7a04e36bfc9a-- From twatteyne@gmail.com Thu Aug 8 16:43:43 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EF15111E816F for <6tsch@ietfa.amsl.com>; Thu, 8 Aug 2013 16:43:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.979 X-Spam-Level: X-Spam-Status: No, score=-0.979 tagged_above=-999 required=5 tests=[AWL=-0.861, BAYES_20=-0.74, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0rkV2xGHdC5U for <6tsch@ietfa.amsl.com>; Thu, 8 Aug 2013 16:43:43 -0700 (PDT) Received: from mail-pa0-x234.google.com (mail-pa0-x234.google.com [IPv6:2607:f8b0:400e:c03::234]) by ietfa.amsl.com (Postfix) with ESMTP id 28F4911E824A for <6tsch@ietf.org>; Thu, 8 Aug 2013 16:43:43 -0700 (PDT) Received: by mail-pa0-f52.google.com with SMTP id kq13so4225977pab.25 for <6tsch@ietf.org>; Thu, 08 Aug 2013 16:43:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=TWw9lH1ZbJMdewB9nuGNjFRDBZWh+a+TZ3kFz1bpEKU=; b=aladYsH/MOrF7NGcpv4AaQRAygY9GzQa35zKCUmN+bWfhX1dgwHA4hcn47WiMMdVMN s09VErqSLWavHPIaArIG28yzgKD6h2Hu4/GV3pQM2anCObEgvVLMbLGF7s5uGwmbOnfO 0/FfmT7R26p9ntlrWkGgKXJAtWhNUYSVCiQPH3qtXOpHeTZ9X36JuXiQJ9zM54JE/Gqi CMXOyeDR6PCFURYrzDu/km9wAqOSzPXCEpFdmHaS7oIUwxZZX/c2JL0x726VUmZAMv9i ltzLtMR0Zl6++fXVKVKtwIiwya2WeEIZ10kWtPyIo+aOZjtndhABx9mHwSCUHhECyEFw bVEw== X-Received: by 10.68.186.193 with SMTP id fm1mr8443889pbc.163.1376005422764; Thu, 08 Aug 2013 16:43:42 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Thu, 8 Aug 2013 16:43:22 -0700 (PDT) From: Thomas Watteyne Date: Thu, 8 Aug 2013 16:43:22 -0700 X-Google-Sender-Auth: 5D2nnHxBTY41koBUlv9GBqYb5lk Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7bd764b26ed73d04e3783a26 Subject: [6tsch] Agenda for the call on August 9 X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Aug 2013 23:43:44 -0000 --047d7bd764b26ed73d04e3783a26 Content-Type: text/plain; charset=ISO-8859-1 All, Below is the proposed agenda for the 6TSCH call tomorrow: - agenda bashing [2min] - debrief Berlin [2min] - revamped charter [3min] - "master plan" next steps [10min] - Technical discussion on "Timeslot Management Methods and Formats" [25min] - Technical discussion on "minimal 6TSCH configuration" [10min] - renaming group [5min] - AOB [2min] (detailed agenda at https://bitbucket.org/6tsch/meetings/wiki/130809_webex) As usual, feel free to propose any changes to the agenda, also at the beginning of the call. Remember that this call will be recorded. Pascal & Thomas ---- Topic: 6TSCH Weekly Time: 8:00 am, Pacific Daylight Time (San Francisco, GMT-07:00) Meeting Number: 206 802 913 Meeting Password: sixtus ------------------------------------------------------- To start the online meeting ------------------------------------------------------- 1. Go to https://ciscosales.webex.com/ciscosales/j.php?ED=219615007&UID=481905242&PW=NZTRkNDAwOTE1&RT=MiMyMw%3D%3D 2. Log in to your account. 3. Click "Start Now". 4. Follow the instructions that appear on your screen. ---------------------------------------------------------------- ALERT:Toll-Free Dial Restrictions for (408) and (919) Area Codes ---------------------------------------------------------------- The affected toll free numbers are: (866) 432-9903 for the San Jose/Milpitas area and (866) 349-3520 for the RTP area. Please dial the local access number for your area from the list below: - San Jose/Milpitas (408) area: 525-6800 - RTP (919) area: 392-3330 ------------------------------------------------------- To join the teleconference only ------------------------------------------------------- 1. Dial into Cisco WebEx (view all Global Access Numbers at http://cisco.com/en/US/about/doing_business/conferencing/index.html 2. Follow the prompts to enter the Meeting Number (listed above) or Access Code followed by the # sign. San Jose, CA: +1.408.525.6800 RTP: +1.919.392.3330 US/Canada: +1.866.432.9903 United Kingdom: +44.20.8824.0117 India: +91.80.4350.1111 Germany: +49.619.6773.9002 Japan: +81.3.5763.9394 China: +86.10.8515.5666 To check whether you have the appropriate players installed for UCF (Universal Communications Format) rich media files, go to https://ciscosales.webex.com/ciscosales/systemdiagnosis.php http://www.webex.com CCM:+14085256800x206802913 --047d7bd764b26ed73d04e3783a26 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    Below is the proposed a= genda for the 6TSCH call tomorrow:
    • agenda bashing [2= min]
    • debrief Berlin [2min]
    • revamped charter [3min]<= br>
    • "master plan" next steps [10min]
    • Technical d= iscussion on "Timeslot Management Methods and Formats" [25min]
    • Technical discussion on "minimal 6TSCH configuration" [= 10min]
    • renaming group [5min]
    • AOB [2min]

    As usual, feel free to propose any changes to the= agenda, also at the beginning of the call.

    Rememb= er that this call will be recorded.

    Pascal & T= homas

    ----

    Topic: 6TSCH Weekly
    =
    Time: 8:00 am, Pacific Daylight Time (San Francisco, GMT-07:00)=A0
    Meeting Number: 206 802 913=A0
    Meeting Password: sixtus=A0=

    -------------------------------------------------------= =A0
    To start the online meeting=A0
    --------------------= -----------------------------------=A0
    2. Log in to your account.=A0
    3. Click "Start Now"= .=A0
    4. Follow the instructions that appear on your screen.=A0

    ----------------------------------------------------= ------------=A0
    ALERT:Toll-Free Dial Restrictions for (408) and (919) Area Codes=A0
    ----------------------------------------------------------------=A0=

    The affected toll free numbers are: (866) 432-9903 for the San Jose/M= ilpitas area and (866) 349-3520 for the RTP area.=A0

    Please dial the local access number for your area from = the list below:=A0
    - San Jose/Milpitas (408) area: 525-6800=A0
    - RTP (919) area: 392-3330=A0

    ------------= -------------------------------------------=A0
    To join the teleconference only=A0
    -------------------------= ------------------------------=A0
    1. Dial into Cisco WebEx (view = all Global Access Numbers at=A0
    2. Follow the prompts to enter the Meeting Number (listed above) or Ac= cess Code followed by the # sign.=A0

    San Jose, CA:= +1.408.525.6800 RTP: +1.= 919.392.3330=A0

    US/Canada: +1.86= 6.432.9903 United Kingdom: +44.20.8824.0117=A0


    CCM:+14085256800x206802913=
    --047d7bd764b26ed73d04e3783a26-- From twatteyne@gmail.com Thu Aug 8 20:32:40 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9AB0F11E8192 for <6tsch@ietfa.amsl.com>; Thu, 8 Aug 2013 20:32:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.566 X-Spam-Level: X-Spam-Status: No, score=-1.566 tagged_above=-999 required=5 tests=[AWL=-0.189, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_84=0.6, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hd2g+jtKHADr for <6tsch@ietfa.amsl.com>; Thu, 8 Aug 2013 20:32:37 -0700 (PDT) Received: from mail-pa0-x244.google.com (mail-pa0-x244.google.com [IPv6:2607:f8b0:400e:c03::244]) by ietfa.amsl.com (Postfix) with ESMTP id 8969611E815F for <6tsch@ietf.org>; Thu, 8 Aug 2013 20:32:34 -0700 (PDT) Received: by mail-pa0-f68.google.com with SMTP id kl13so1792313pab.3 for <6tsch@ietf.org>; Thu, 08 Aug 2013 20:32:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=BLTvdjaMWP6sArfqcCOv5EkjQ8cl/f8ndQpYglz1Oh4=; b=lclfPgkL7DTwdIVReK2iIP0ou9esgZMfoHDa/jyp7aGQbE1v8fzECjl+jO54R14Gm+ 0rszOmzk8s1n4attGJx7Ho/NPqHpS2eJtsbzwwwqeJvIYPOCQwgC8RMboHmFw5YHVJOL oY32xneKeALwzfSvdU+DgHVzEQrKDqhU87HQD+LwG6cMO/XGM/RhUgbS2VU1zOn4Ndco dpNSPqkWUQ2Zw1tlLFRIBdKSeIZiKSQc2joI4B7ob86AiUGbm5BymCdf1u3fVNV9/o5+ DthEoD5s/3Ehk/02Os38e/UUCc2+vsl+Hv1QVbl6PxDMvhf8vjjrqSffKAq1K/m3ehEe sRXw== X-Received: by 10.66.12.193 with SMTP id a1mr9188435pac.80.1376019152121; Thu, 08 Aug 2013 20:32:32 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Thu, 8 Aug 2013 20:32:11 -0700 (PDT) From: Thomas Watteyne Date: Thu, 8 Aug 2013 20:32:11 -0700 X-Google-Sender-Auth: -8Z5bN2hgCiqBUAKH3459gJaoOk Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=bcaec520e4f1c4360a04e37b6cdf Subject: [6tsch] IETF87 6TSCH BoF minutes X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Aug 2013 03:32:40 -0000 --bcaec520e4f1c4360a04e37b6cdf Content-Type: text/plain; charset=ISO-8859-1 All, You will find the minutes of the 6TSCH BoF during IETF 87 at: https://bitbucket.org/6tsch/meetings/wiki/130730b_ietf-87_berlin_bof I also copied them at the end of this e-mail. Let's give ourselves one week to work on/discuss these minutes. Once we have reached consensus, I will upload them into the proceedings. If you find any errors/inaccuracies, or know missing names, please reply directly to this e-mail. Thomas --- Minutes IETF 87 BoF, 30 July 2013, 6TSCH group Note: timestamps in CEST. Venue - Tuesday July 30, 15.20-16.50 - Bellevue room, InterContinental Berlin, Berlin, Germany Taking notes *(using Etherpad)* 1. Xavi Vilajosana 2. Dominique Barthel 3. Pouria Zand Jabber - Room: xmpp:6tsch@jabber.ietf.org - Logs: http://jabber.ietf.org/logs/6tsch/ - Proxy: Guillaume Gaillard Recordings - audio recording [mp3,43MB] - webex recording (no sound) [streaming] - Jabber logs Material - BoF Poster [240kB] - Consolidated Slides [1.5MB] - All slides Agenda See https://datatracker.ietf.org/meeting/87/agenda/6tsch/ 6TSCH: Deterministic IPv6 over IEEE802.15.4e Timeslotted Channel HoppingBoF Agenda Meeting : IETF 87 Tuesday, July 30, 2013Time : 1520-1650 CEST Afternoon Session II (90min)Location : BellevueChairs : Pascal Thubert Thomas Watteyne Responsible AD : Ted Lemon URLs : https://www.ietf.org/mailman/listinfo/6tsch https://bitbucket.org/6tsch=========================================================== problem statement [40min] what is IEEE802.15.4e TSCH? [15min] (Maria Rita Palattella, (draft-watteyne-6tsch-tsch-lln-context) Thomas Watteyne) what is missing? [15min] (Xavi Vilajosana) why is this a problem? [3min] (Alfredo Grieco) status of 6TSCH group [7min] (Thomas Watteyne, (draft-thubert-6tsch-architecture) Pascal Thubert) discussion of the charter [20min] Introduction [1min] (Thomas Watteyne) description of the WG [4min] (Dominique Barthel) work items [10min] (Raghuram Sudhaakar) non-milestone work items [2min] (Pascal Thubert) external work to other WG [3min] (Pascal Thubert) open discussion and questions [30min] Proposed charter for the BoF: https://bitbucket.org/6tsch/charter-ietf-6tsch/src Attendance - about 60 people present at 3:22 - about 80 people present at 3:25 Minutes - *[15:20]* BoF starts - *[15:20]* Introduction *[Thomas Watteyne]* - Official pronounciation of 6TSCH is "sixtus" - administrivia: - be aware of IPR principles - circulate blue sheets - volunteers for scribes: Xavi Vilajosana, Dominique Barthel, Pouria Zand (over Etherpad) - Jabber coordinator: Guillaume Gaillard (room address on slide) - Note Well - Presentation of the agenda: - we have 1h30, until 4.50 - 40min presentation of the problem statement. - 10min for clarifying questions - description of the charter. URL on the slide. - open discussion and question - questions are inline on the slides, recap at the end - *[15:23]* IT/OT network convergence *[Pascal Thubert]* - one slide for set the stage - two terms: - OT (Operational technologies). :ittle penetration of IETF technology in OT world. - IT - We are preparing the convergence of IT and OT networks - We need to provide capabilities, in particular deterministic properties - we have control over where every packet is. Critical to enable e.g. control loops - vision of what process control network might look like if we move to 6TSCH networks - *[15:25]* Approval of the agenda *[Thomas Watteyne]* No objections to current agenda. Agenda approved. - *[15:25]* What is IEEE802.15.4e TSCH? *[Maria Rita Palattella]* - *Thomas* introduces *Maria Rita* - overview of data link protocol we want to use within 6TSCH - IEEE802.15.4e task group create at 2010 - amendment of the IEEE802.15.4 that will provide very low power consumption and high reliability - 3 new MAC (Medium Access Control) mode, Timeslotted Channel Hopping (TSCH) is the focus of this group - Draft since 2010, published in 2012 - Uses PHY layer of IEEE802.15.4, no new radio chip needed - Widely used in low power wireless mesh networks - Provides good tradeof between throughput, energy consumption, bandwidth, packet length, range - Different working groups created within IETF to provide IPv6 protocol stack on top of IEEE802.15.4. Can we do the same with IEEE802.15.4e TSCH? Would allow networks with better performance. request from Jabber: microphone lower. OK. - Designed for multi-hop networks. Synchronized operation. Time divived in time slots. Grouped in slotframes. - Slots are identified by slot offset and channel offset. Cells are mapped to a scheduling table. - A slot is long enough to send a data frame and receive an ack (10ms typical). - Clocks drift. Need for synchronization between neighbors. Done by exchanging packets to re-synchronize by time stamping. - Overhead of synchronization is very low. See http://tools.ietf.org/html/draft-watteyne-6tsch-tsch-lln-context-02. - Channel hopping: every packet is sent in a different frequency due to channel hopping. Known to efficiently combat multi-path fading and narrow-band interference. - Translation function from channel offset to frequency. - The communication schedule allows for a clean trade-off between energy consumption, latency, bandwidth and redundancy. - We call "tracks" the multi-hop paths between source and destination nodes. - Deterministic networking: traffic is known a priori. Deterministic traffic flows, known data-rate, known routing path to follow. - The link-layer resources are allocated when are needed. - Supports traffic engineering - Timely transmission because: - no hot potato forwarding - no exponential backoff - no collisions and virtually no jitter - no CSMA/CA mechanism - collision-free schedule typically built. - Good illustration is a train - Proven technology. - TSMP (2006), then WirelessHART ISA100.11a - Commercial products and thousands of networks running using this technology. - But these are not based 802.15.4e TSCH; missing blocks. - Existing systems are monolitic stack. IEEE802.15.4e defines layer 2 (link layer), and the interface to upper layers, making it suitable for IETF to build an IP stack. - Applications: Control loops, process control, umbrella networks, widespresad monitoring, etc. - Suitable for traffic engineering. - Summary: proven technology, deterministic, flow isolation, TE, low power consumption. IT/OT convergence. - *[15:41]* What is missing? *[Xavi Vilajosana]* - *Thomas* introduces *Xavi* - objective: enable OT integration to the Internet architecture. Use existing blocks and define missing ones where needed. - many building blocks exist. Not all of them in IETF scope. Not all of them IPv6 compliant. - what does IEEE802.15.4e *not* provide: network formation, maintenance, multi-hop topology (how routing protocol builds on top of 15.4e), ressource management (currently vendors implement own solutions), dataflow control (how to manage queue number, priorities w.r.t. to flows, retransmission) - how do we endure determinism (latency, bandwidth) - how to interconnect to PCE (which protocol?) - how to distribute keying material, how is authentication done? - existing blocks will come from IETF (6LoWPAN, ROLL, CoRE), ISA100, WirelessHART - missing: schedule computation (centralized and distributed), how is the schedule distributed to nodes along the track, missing a global picture (backbone integration, architecture definition) - missing: how is QoS enforced, how is the performance monitored, how are metrics conveyed to the routing protocol, management of traffic classes, queues, differentiated services, how to make RPL know how to build routes on top of layer 2 mesh. - missing: keys distribution, label switching based on slots (G-MPLS-like), backbone operation, relocation of nodes. - global block diagam: how do individual nodes talk to PCE across backbone and BackBone Routers (BBR), what if nodes relocate from one 6TSCH network to another? Thomas indicates that there has been some discussion on the Jabber room about the term MAC. Means "Medium Access Control". We're talking about the link layer. - *[15:53]* Why is this a problem? *[Alfredo Grieco]* - dissatisfaction because of competing standards - IETF has many available building blocks, difficult to put together without architecture document - open source implementation of the standards - *[15:55]* Status of the group *[Thomas Watteyne]* - Mailing list started end of January 2013 - 159 members - weekly meeting, Fridays 8am PDT - 21 calls until now. Average attendance of 11.2. - 2 1.5h meetings at IETF 86 Orlando. - Home page at https://bitbucket.org/6tsch/. Contains agenda, minutes, recording, draft, source idea, charter. - 6 drafts produced so far: - https://datatracker.ietf.org/doc/draft-ohba-6tsch-security/ - https://datatracker.ietf.org/doc/draft-palattella-6tsch-terminology/ - https://datatracker.ietf.org/doc/draft-thubert-6tsch-architecture/ - https://datatracker.ietf.org/doc/draft-vilajosana-6tsch-basic/ - https://datatracker.ietf.org/doc/draft-wang-6tsch-6top/ - https://datatracker.ietf.org/doc/draft-watteyne-6tsch-tsch-lln-context/ - 13 authors - *[15:56]* Architecture draft *[Pascal Thubert]* - Informational draft - Entry point into the activity of the group - Requirements: - Wireless Process control - Smart cities - Scope: - network in a factory flow - 6TSCH LLN, you want to interconnect them as they grow. Controllers (PLCs, DCS's) that sit in the control loop. - Study what is going on the backbone - Stack : Almost all components already exist. - A few of those components are a bit chatty (PCEP, RSVP) - putting some glue - The 6top component is the one that does not exist. - Centralized vs distributed routing - There are cases that we want both cases. Each case has it own benefits - Architecture: Forwarding in the routing can happen at different levels. - Traditional IP forwarding - Capability to map an incomming time slot to an outgoing timeslot. GMPLS-like. - 6top switches packets based on label. No need to look at packet header. - Enables tunneling other protocols (e.g WirelessHART, ISA100.11a) - Fragment forwarding. Currently need to recompose each packet at each hop. This is inefficient. A draft proposes that first fragment installs state in intermediate nodes so that the next fragment can be forwarded. This draft may find its home at 6Lo. - Integrating components, not considering multicast. - *[16:03]* Clarifying questions. - *Q.* [*Ted Lemon*] Operational is out of scope, what about debugging? Simply not standardized? - A. [*Pascal Thubert*] There is work done at ISA100.20 called Common Network Management (CNM). Coordinate with them. We might recharter and include some work from/with them. CNM is not well advance. - *Q.* [*Mehdi Mani*] Why you selected TSCH mode of IEEE802.15.4e? - A. [*Thomas Watteyne*] We have experience on that, implementing and running networks like this. We are not a research team, engineering. - A. [*Pascal Thubert*] Tens of thousands of networks deployed. We don't have another alternative that has been proven to work at that level. Emulating for the PCE piece what exists and proven in WirelessHART and ISA100.11a. - A. [*Thomas Watteyne*] Modes are very different. Scope would be too large if we wanted to embrace all. - *Q.* [*Mehdi Mani*] Why not another mode? - A. [*Pascal Thubert*] As much as we can, not be too specific. For example in the future most of our work would apply for e.g. TSCH over WiFi. - Q. [*Mehdi Mani*] Will you skip routing at network layer? - A. [*Pascal Thubert*] We are not reinventing anything in routing, using existing technology as RPL. We are enabling GMPLS on that technology. - *Q.* [*Shahid Raza, SICS*] You target process automation industry. Are you only going to target IEEE802.15.4e, or also ISA100.11a and WirelessHART? We can use 6LoWPAN on ISA100.11, WirelessHART is well adapted. - A. [*Thomas Watteyne*] WirelessHART covers a full protocol stack. IEEE802.15.4e clearly separates layer 2 from upper layers. - A. [*Pascal Thubert*] ISA uses 5-6 RFC from IETF. Constant exchange between IETF and ISA. IETF has many components ISA does not have, i.e. backbone, DHCP, ND. We are talking aboot converges IT/OT, ISA has none of them. - *Q.* [*Shahid Raza, SICS*] Minor difference between MAC layers of IEEE802.15.4e, ISA100.11a, WirelessHART. What do we target? - A. [*Pascal Thubert*] Standards are defined, we cannot change them. We hope that ISA100 considers this work for next generation. Standards are locked. - *Q.* [*William (?1)*] Confused about scope. Architecture involves connecting a deterministic MAC to an infrastructure (i.e. Ethernet). Does explicit scheduling in those networs apply to 6TSCH? - A. [*Pascal Thubert*] Deterministic ethernet plays at a different scale than TSCH, we are talking of 3 or 4 orders of magnitude. Factory automation (100Hz control loop) would require deterministic Ethernet. Process control can get away with determinitic radio and regular Ethernet. - *Q.* [*William (?1)*] Is there an assumption that there is a low packet rate? - A. [*Pascal Thubert*] Usually very low. - *Q.* [*William (?1)*] Makes sense. - A. [*Pascal Thubert*] Next question is whether we can enable on WiFi. - *Q.* [*Adrian Farrel*] Can the 6TSCH networks be dual-homed into the backbone? - A. [*Pascal Thubert*] Single subnet. We want to be able to move from one LLN to the next without renumbering. - *Q.* [*Adrian Farrel*] Could there be a second backbone connecting other clouds, so that one cloud is transit? - A. [*Pascal Thubert*] We don't consider transit at all. - *Q.* [*Adrian Farrel*] Could the PCE be placed inside one of the clouds? - A. [*Thomas Watteyne*] The architecture locates the PCE on the backbone. - *Q.* [*Erik Nordmark*] Global optimizations. What does it mean to do global optimizations? It is already defined? It is engineering or research? - *Q.* [*Erik Nordmark*] Backbone router draft in 6MAN. Does that mean that backbone not in scope for 6TSCH and we can focus on what's inside single LLN? - A. [*Pascal Thubert*] Idea for this group is to coordinate. - A. [*Pascal Thubert*] The global optimization is resolved by different components but mainly propietary. We don't standardize the computation in the PCE. - *Q.* [*Jabber (relayed by Guillaume Gaillard)*] Regarding centralized and distributed routing, will 6TSCH have to do both? Isn't it difficult. - A. [*Thomas Watteyne*] Relates to charter discussion, let's ask this then. - *[16:17]* Introduction to charter *[Thomas Watteyne]* - Proposed charter at URL available in the agenda. - Announced since April 2013. Work on it in April. Minor adjustement in last coupld of weeks. - We will follow the outline of the charter to present. - *[16:19]* Description of the WG *[Dominique Barthel]* - Who are the people on that work: - Academia, Big companies, network operators. - Americas,Asia, Europe. - Around two dozen people very active. - PCE, etc. active people in IETF. - large WSN deployment experience. - Will deliver: - Open-Source implementation (OpenWSN UC Berkeley, Nivis) - Big commercial companies etc. - Availble OS. - Charter: - TSCH mode of 15.4e - not only 2.4GHz PHY - open standard - Standardize missing components. - Work on backbone routers and PCE and other IPv6 entities. - Centralized routing computation - best effort resource allocaiton scheme - distributed resource reservation - IPv6 flows, classes of services. - Produce architectural recommendations - Coordinate with other std bodies. - *[16:25]* Work Items *[Raghuram Sudhaakar]* - *Thomas* introduces *Raghuram* - key focus is 6top: - specification of the sublayer - define the hooks that are required by upper layers to setup schedules - define how to bootstrap a TSCH network - 6TSCH centralized routes and tracks management - comunication between PCE and 6top - 6TSCH distributed routes and track managemnt. - how to stablish a path along RPL routes in a distributed manner - Minimal 6TSCH configuration - For adoption and interoperability testing - Hardcoded schedules. Not requiring PCE nor Distributed. - 6TSCH architecture: - TSCH overview, presents the problem statetment. Presents overview of the TSCH MAC layer, presents the missing pieces. - 6TSCH security architecture requirements. Authentication of nodes, etc. - consider PANA protocol. - work items 1 and 3 are standard track, the rest are informational. - *[16:30]* External work *[Pascal Thubert]* - *Thomas* introduces *Pascal* - External work. Coordination with other groups (Internet, Routing areas) - Other documents will be provided (applicability statements) - *Q.* [*Dan Romascanu*] What is the list of groups we will work with? - A. [*Pascal Thubert*] We have a list in the charter of the groups we are going to work with. - *[16:32]* Open Discussion - *Q.* [*Emmanuel Baccelli, INRIA*] Enthusiastic about this group. Concern: a lot of work. Prioritize the work. List of documents, needs to be ordered according to priorities. Order things in time. Scope the charter more precisely. - A. [*Pascal Thubert*] Point taken. - *Q.* [*Lars Eggert*] Footprint for a device, are we able to run all this on a resource-constrained device? RSVP, PANA are heavy-weight. May need to work on a lightweight version of these, nobody is working on it at this time in their respective WG. - A. [*Thomas Watteyne*] We have an open source implementation running (RPL, CoAP, IEEE802.15.4e, no PANA, no RSVP). Footprint is about 4kB or ROM, 35kB of flash. - *Q.* [*Lars Eggert*] Be prepared to work without PHP. - *Q.* [*Benedikt Stockebrand, Stepladder IT*] Smallest microcontrollers known to run USB have 2kB of Flash, 128B of RAM (including CPU registers). Microcontrollers are very limited in resources. If we get along this way, microcontrollers able to run this stack will simply be to expensive to be usable. - A. [*Thomas Watteyne*] It's a constant concern. Centralized reservation is intended for very small footprint. This fits in decade year old MSP430-based motes. - *Q.* [*Benedikt Stockebrand, Stepladder IT*] A number of people are not aware of footprint. - *Q.* [*Carsten Bormann*] We have a document from the LWIG WG classifying microcontrollers. Class 1 (~10kB RAM, 100kB ROM) smallest sized full citizen of the Internet. ZigBee IP typically on Class 2 device. - A. [*Thomas Watteyne*] We target the class 1 devices. - *Q.* [*Rafa Marin-Lopez, University of Murcia*] Clarification. We have a PANA implemenation on Contiki OS on small Jennic device for class 1 micro-controllers. - *[16:41]* Questions - Is this a topic that the IETF should address? - hums for "yes" and for "no" did not produce a clear decision. - show of hands: lots of "yes", a few "no", a handful "dunno". - Are the goals of this WG clear, well-scoped, solvable, and useful? - 50/50 between yes and no - *Q.* [*Ralph Droms*] Strange use of raising hands. Why not record hums? - *A.* [* (?2) *] I prefer show of hands, countable and unambiguous. Hums on depend on where you sit in room. - *A.* [* (?3) *] Hums are good for getting sense of the room. If you don't get a good sense, you need to clarify. - Who is willing to edit documents, comment documents, implement? - About 20-30 people raise hands. - Should a 6TSCH WG be formed? - *Q.* [* (?4) *] Clarifying question. As chartered? Topic is usual, but roles are not clear. - *Q.* [*Pascal Thubert*] How should we work it out? - *A.* [* (?5) *] You've gotten the useful data out of the room already. There was clear support for "is the topic useful". Are the goals clear? There was clear hesitation. That's the information you need to know. - *A.* [* (?6) *] Use the posaitive energy that was shown here for improving the charter. - *[Pascal]* Next step will be to work on the ML to on improving the charter, and ask those who voted it was not clear to participate in clarifying the charter. - *Q.* [*Alex Petrescu*] Back to question "is this a topic that the IETF should address?". Should also ask yourselves if there is another SDO should address. Maybe this is something somebody else should work on. - A. [*Pascal Thubert*] IETF is producing lots of components. It is dificult to put them together. One of the goals is to package these components. - *Q.* [*Shahid Raza*] WirelessHART is discussing IEEE802.15.4e. - A. [*Pascal Thubert*] Question is whether we can build the convergence IT/OT. - *[16:50]* End of meeting --bcaec520e4f1c4360a04e37b6cdf Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    You will find the minutes of the 6= TSCH BoF during IETF 87 at:

    I also copied them at the end of this e-mail.

    Let's give ourselves one week to work on/discuss = these minutes. Once we have reached consensus, I will upload them into the = proceedings.

    If you find any errors/inaccuracies, or know missing na= mes, please reply directly to this e-mail.

    Thomas<= /div>

    ---

    Minutes IETF 87 BoF, 30 July 2013, 6TSCH group

    Note: timestamps in CEST.

    Venue

    • Tuesday July 30, 15.20-16.50
    • Bellevue room, InterContinental Berlin, Berlin, German= y

    Taking notes=A0(using Etherpad)

    1. Xavi Vilajos= ana
    2. Domi= nique Barthel
    3. Pouria Zand

    Jabber

    Record= ings

    <= h2 id=3D"markdown-header-material" style=3D"margin:20px 0px 0px;font-size:2= 0px;font-weight:normal;line-height:1.5;color:rgb(51,51,51);padding:0px;font= -family:Arial,sans-serif"> Material

    Agenda

    See=A0https://datatracker.ietf.org/meeting/87/agenda/6tsch/

    
6TS=
CH: Deterministic IPv6 over IE=
EE802.15.4e Timeslotted=
 Channel Hopping
BoF Agenda

Meeting        :   IETF 87 Tuesday, July 30, 2013=

Time           :   1520-1650 CEST Afternoon Session II (90min)
Location       :   Bellevue
Chairs         :   Pascal Thubert <=
;pthubert@cis=
co.com>
                   Thomas Watteyne=
 <watteyne=
@eecs.berkeley.<=
span class=3D"" style=3D"color:rgb(0,128,128)">edu&=
gt;
Responsible AD :   Ted Lemon =
<ted.lemon@nominum.com>
URLs           :   https://www=
.ie=
tf.org/mailman/l=
istinfo/6tsch
                   https://=
bitbucket.org/6tsch
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

problem statement [40min]
    what is IEEE802.15.4e TSCH?           [15min] (Maria Rita Palattella,
    (draft=
-watteyne-6tsch<=
span class=3D"">-tsch-lln-cont=
ext)        Thomas <=
span class=3D"">Watteyne)
    what is missing?    =
                  [15min] (Xavi V=
ilajosana)
    why is this a problem?                [3min]  (Alfredo Grieco)
    status of 6TSCH <=
span class=3D"">group                 [7min]  (Tho=
mas Watteyne,
    (draft=
-thubert-6tsch-architecture)             Pascal Thube=
rt)

discussion of the charter [<=
span class=3D"" style=3D"color:rgb(0,153,153)">20mi=
n]
    Introduction                          [1min]  (Thomas Watteyne)
    description of the WG                 [4min]  (<=
span class=3D"">Dominique Barthel)
    work items             =
               [10min] =
(Raghuram =
Sudhaakar)
    non-mi=
lestone work items  =
            [2min]  (Pascal Thube=
rt)
    external work to other WG =
            [3min]  (Pascal Thube=
rt)

open discussion and questions [30=
min]

Proposed charter for the=
 BoF: http=
s://bitbucket.org/6tsch/charter-ietf-6tsch/=
src

    Attendance

    • about 60 people present at 3:2= 2
    • about = 80 people present at 3:25

    Minutes

    • [15:20]=A0BoF starts<= /li>
    • [15:= 20]=A0Introduction=A0[Thomas Watteyne]
      • Official pro= nounciation of 6TSCH is "sixtus"
      • administrivia:
        • be aware of = IPR principles
        • circulate blue sheets
        • volunteers for scribes: Xavi Vilajosana, Dominique Barthel, Pouria Zand (ov= er Etherpad)
        • Jabber coordinator: Guillaume Gaillard (room address on slide)
      • Note We= ll
      • Prese= ntation of the agenda:
        • we have 1h30, until 4.50
        • 40min presentation of the problem statement.
        • 10min for clarifying = questions
        • description = of the charter. URL on the slide.
        • open discussion and question
      • questions are inline on the slides, recap at the end
    • [15:23]=A0I= T/OT network convergence=A0[Pascal Thubert]
      • one slide fo= r set the stage
      • two terms:
        • OT (Operational technologies). :ittle penetration of IETF technology in OT = world.
        • I= T
      • We are preparing the convergence of IT and OT networks
      • We need to provide capabilit= ies, in particular deterministic properties
        • we have cont= rol over where every packet is. Critical to enable e.g. control loops
          • <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word">vision of wha= t process control network might look like if we move to 6TSCH networks
    • [15:25]=A0Approval of the agenda=A0[Thomas Watteyn= e]

      No objections to c= urrent agenda. Agenda approved.

    • [15:25]=A0What is IEEE802= .15.4e TSCH?=A0[Maria Rita Palattella]
      • Thom= as=A0introduces=A0Maria Rita
      • overview of data link protoc= ol we want to use within 6TSCH
      • IEEE802.15.4= e task group create at 2010
      • amendment of the IEEE802.15.4 that will provide very lo= w power consumption and high reliability
      • 3 new MAC (M= edium Access Control) mode, Timeslotted Channel Hopping (TSCH) is the focus= of this group
      • Draft since 2010, published in 2012
      • Uses PHY layer of IEEE802.15.4, no new radio ch= ip needed
      • Provides good tradeof between throu= ghput, energy consumption, bandwidth, packet length, range
      • Different working groups created within IETF to provide IPv6 protocol stack= on top of IEEE802.15.4. Can we do the same with IEEE802.15.4e TSCH? Would = allow networks with better performance.

        request from Jabbe= r: microphone lower. OK.

      • Designed for multi-hop networks. Synchron= ized operation. Time divived in time slots. Grouped in slotframes.
      • Slots are id= entified by slot offset and channel offset. Cells are mapped to a schedulin= g table.
      • A slot is long enough to send a data frame and receive an ack (10ms typical= ).
      • Clock= s drift. Need for synchronization between neighbors. Done by exchanging pac= kets to re-synchronize by time stamping.
      • Overhead of = synchronization is very low. See=A0http://tools.ietf.org/html/draft-watteyn= e-6tsch-tsch-lln-context-02.
      • Channel hopp= ing: every packet is sent in a different frequency due to channel hopping. = Known to efficiently combat multi-path fading and narrow-band interference.=
      • Translation = function from channel offset to frequency.
      • The communication schedule allows for a = clean trade-off between energy consumption, latency, bandwidth and redundan= cy.
      • We call &quo= t;tracks" the multi-hop paths between source and destination nodes.
      • Determinis= tic networking: traffic is known a priori. Deterministic traffic flows, kno= wn data-rate, known routing path to follow.
      • The link-lay= er resources are allocated when are needed.
      • Supports traffic engineering
      • Timely transmission because:
          <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word">no hot potato= forwarding
        • no exponential backoff
        • no collisions and virtually no jitter
        • no CSMA/CA mechanism
        • collision-free schedule typically built.
      • Good illustration is a train
      • Proven tech= nology.
        • TSMP (2006),= then WirelessHART ISA100.11a
        • Commercial products and thousands of networks running= using this technology.
        • But these ar= e not based 802.15.4e TSCH; missing blocks.
        • Existing systems are monolitic stack. I= EEE802.15.4e defines layer 2 (link layer), and the interface to upper layer= s, making it suitable for IETF to build an IP stack.
      • Ap= plications: Control loops, process control, umbrella networks, widespresad = monitoring, etc.
      • Suitable for traffic engineering.
      • Summary: proven technology, deterministic, flow i= solation, TE, low power consumption. IT/OT convergence.
    • [15:41]=A0What is missing?=A0[Xavi Vilajosana]
    • Thomas=A0introduces=A0Xavi
    • objective: e= nable OT integration to the Internet architecture. Use existing blocks and = define missing ones where needed.
    • many building blocks exist. Not all of them in IETF scope. Not all of them = IPv6 compliant.
    • what does IEEE802.15.4e=A0not=A0provide: network formation= , maintenance, multi-hop topology (how routing protocol builds on top of 15= .4e), ressource management (currently vendors implement own solutions), dat= aflow control (how to manage queue number, priorities w.r.t. to flows, retr= ansmission)
    • how do we en= dure determinism (latency, bandwidth)
    • how to interconnect to PCE (which protocol?)<= /li>
    • how to distr= ibute keying material, how is authentication done?
    • existing blocks will come from I= ETF (6LoWPAN, ROLL, CoRE), ISA100, WirelessHART
    • missing: sch= edule computation (centralized and distributed), how is the schedule distri= buted to nodes along the track, missing a global picture (backbone integrat= ion, architecture definition)
    • missing: how= is QoS enforced, how is the performance monitored, how are metrics conveye= d to the routing protocol, management of traffic classes, queues, different= iated services, how to make RPL know how to build routes on top of layer 2 = mesh.
    • missing: key= s distribution, label switching based on slots (G-MPLS-like), backbone oper= ation, relocation of nodes.
    • global block diagam: how do individual nodes talk to PCE across backbone an= d BackBone Routers (BBR), what if nodes relocate from one 6TSCH network to = another?

      Thomas indicates t= hat there has been some discussion on the Jabber room about the term MAC. M= eans "Medium Access Control". We're talking about the link la= yer.

  • [15:53]=A0Why is this a problem?=A0[Alfred= o Grieco]
    • dissatisfaction because of competing standards
    • IETF has many available building blo= cks, difficult to put together without architecture document
    • open source implementation of the standards
  • [15:55]=A0Status of = the group=A0[Thomas Watteyne]
  • [15:56]=A0Architecture draft=A0[Pascal Thubert]=
    • Informationa= l draft
    • = Entry point into the activity of the group
    • Requirements:
      • Wireless Process control
      • Smart citie= s
    • Sc= ope:
      • network in a factory flow
      • 6TSCH LLN, you want to interconnect them as they grow. Controllers (PLCs, D= CS's) that sit in the control loop.
      • Study what is going on the backbone
      • Stack : Almost all components already exist.
      • A few of those components are a bit ch= atty (PCEP, RSVP)
      • putting some glue
      • The 6top component is the one that does not exist.
      • =
    • Centralized = vs distributed routing
      • There are ca= ses that we want both cases. Each case has it own benefits
      • Architecture: Forwarding= in the routing can happen at different levels.
      • Traditional = IP forwarding
      • Capability to map an incomming time slot to an outgoing timeslot. GMP= LS-like.
      • 6top switche= s packets based on label. No need to look at packet header.
      • Enables tunneling oth= er protocols (e.g WirelessHART, ISA100.11a)
      • Fragment for= warding. Currently need to recompose each packet at each hop. This is ineff= icient. A draft proposes that first fragment installs state in intermediate= nodes so that the next fragment can be forwarded. This draft may find its = home at 6Lo.
      • Integrating = components, not considering multicast.
  • [16:03]=A0Clari= fying questions.
    • Q.=A0[Ted Lemon] Operational is out of scope, what ab= out debugging? Simply not standardized?
    • A. [Pascal Thubert] There is work done at ISA100.20 called= Common Network Management (CNM). Coordinate with them. We might recharter = and include some work from/with them. CNM is not well advance.
    • Q.=A0[Mehdi Mani] Why you selected TSCH m= ode of IEEE802.15.4e?
    • A. [Thomas Watteyne] We have experience on t= hat, implementing and running networks like this. We are not a research tea= m, engineering.
    • A. [= Pascal Thubert] Tens of thousands of networks deployed. We don'= ;t have another alternative that has been proven to work at that level. Emu= lating for the PCE piece what exists and proven in WirelessHART and ISA100.= 11a.
    • A. [= Thomas Watteyne] Modes are very different. Scope would be too larg= e if we wanted to embrace all.
    • Q.=A0[Mehdi Mani] Why not another mode?
    • A. [Pascal Thubert] As much as we can, not be too specific. For exa= mple in the future most of our work would apply for e.g. TSCH over WiFi.
    • Q. [= Mehdi Mani] Will you skip routing at network layer?
    • A. [Pascal Th= ubert] We are not reinventing anything in routing, using existing = technology as RPL. We are enabling GMPLS on that technology.
    • Q.=A0[Shahid Raza, SICS] You target process automatio= n industry. Are you only going to target IEEE802.15.4e, or also ISA100.11a = and WirelessHART? We can use 6LoWPAN on ISA100.11, WirelessHART is well ada= pted.
    • A. [= Thomas Watteyne] WirelessHART covers a full protocol stack. IEEE80= 2.15.4e clearly separates layer 2 from upper layers.
    • A. [Pascal Thubert] ISA uses 5-6 RFC from IETF. Constant e= xchange between IETF and ISA. IETF has many components ISA does not have, i= .e. backbone, DHCP, ND. We are talking aboot converges IT/OT, ISA has none = of them.
    • Q.=A0[Shahid Raza, SICS] Minor difference between MAC= layers of IEEE802.15.4e, ISA100.11a, WirelessHART. What do we target?
    • A. [= Pascal Thubert] Standards are defined, we cannot change them. We h= ope that ISA100 considers this work for next generation. Standards are lock= ed.
    • Q.=A0[William (?1)] Confused about scope. Architectur= e involves connecting a deterministic MAC to an infrastructure (i.e. Ethern= et). Does explicit scheduling in those networs apply to 6TSCH?
    • A. [= Pascal Thubert] Deterministic ethernet plays at a different scale = than TSCH, we are talking of 3 or 4 orders of magnitude. Factory automation= (100Hz control loop) would require deterministic Ethernet. Process control= can get away with determinitic radio and regular Ethernet.
    • Q.=A0[William (?1)] Is there an assumption that there= is a low packet rate?
    • A. [Pascal Thubert] Usually very low.
    • Q.=A0[William (?1)] Makes sense.
    • A. [Pascal Thubert] Next question is whether we can enable= on WiFi.
    • A. [= Pascal Thubert] Single subnet. We want to be able to move from one= LLN to the next without renumbering.
    • Q.=A0[Adrian Farrel] Could there be a sec= ond backbone connecting other clouds, so that one cloud is transit?
      • A. [Pas= cal Thubert] We don't consider transit at all.
    • Q.=A0[Adrian Farrel] Could the PCE be placed inside o= ne of the clouds?
    • A. [Thomas Watteyne] The architecture locates the PCE on t= he backbone.
    • Q.=A0[Erik Nordmark] Global optimiza= tions. What does it mean to do global optimizations? It is already defined?= It is engineering or research?
    • Q.=A0[Erik Nordmark] Backbone router draft in 6MAN. D= oes that mean that backbone not in scope for 6TSCH and we can focus on what= 's inside single LLN?
    • A. [= Pascal Thubert] Idea for this group is to coordinate.
    • A. [Pascal T= hubert] The global optimization is resolved by different component= s but mainly propietary. We don't standardize the computation in the PC= E.
    • Q.=A0[Jabber (relayed by Guillaume Gaillard)] Regardi= ng centralized and distributed routing, will 6TSCH have to do both? Isn'= ;t it difficult.
    • A. [= Thomas Watteyne] Relates to charter discussion, let's ask this= then.
  • [16:17]=A0Introduction to charter=A0[Thomas Watteyne]
    • Proposed charter at URL available in = the agenda.
    • Announced si= nce April 2013. Work on it in April. Minor adjustement in last coupld of we= eks.
    • We = will follow the outline of the charter to present.
  • [16:19]=A0Description of the WG=A0[Dominique Barthel]
    • Who are the people on that work:
      • Academia,= Big companies, network operators.
      • Americas,Asia, Europe.
      • Around two dozen people very active.
      • PCE, etc. active people in IETF= .
      • large WSN de= ployment experience.
    • Will deliver:
      • Open-Source = implementation (OpenWSN UC Berkeley, Nivis)
      • Big commercial companies etc.
      • Availble OS.
    • Charter:
      • TSCH mode of 15.4e= - not only 2.4GHz PHY
      • open standar= d
      • Standa= rdize missing components.
      • Work on backbone routers and PCE and other IPv6 entities.
      • Centralized routing compu= tation
      • best effort resource allocaiton scheme
      • distributed = resource reservation
      • IPv6 flows, classes of services.
      • Produce architectural recommendations
      • Coordinate with other std bodies.
  • [16:25]=A0Work Items=A0[Raghuram Sudhaakar]
    • Thomas=A0introduces=A0= Raghuram
    • key focus is= 6top:
      • specification of the sublayer
        • <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word"> define the hooks that are required by upper layers to setup schedules<= /ul>
      • def= ine how to bootstrap a TSCH network
      • 6TSCH centralized routes and tracks management
        • comunication between PCE and 6top
      • 6TSCH distributed routes and track managemnt.
        • how to stablish a path along RPL routes in a distributed manner
        • Minimal= 6TSCH configuration
          • For adoption and inte= roperability testing
          • Hardcoded sc= hedules. Not requiring PCE nor Distributed.
        • 6TSCH architecture:
          • TSCH overvie= w, presents the problem statetment. Presents overview of the TSCH MAC layer= , presents the missing pieces.
        • 6TSCH security architecture requirements. Authentication of nodes, etc.
          • consider PANA protocol.
        • work items 1 and 3 are standard track, the rest are informational.
        • [1= 6:30]=A0External work=A0[Pascal Thubert]
          • Thom= as=A0introduces=A0Pascal
          • External work. Coordination with= other groups (Internet, Routing areas)
          • Other docume= nts will be provided (applicability statements)
          • Q.=A0[Dan = Romascanu] What is the list of groups we will work with?
          • A. [= Pascal Thubert] We have a list in the charter of the groups we are= going to work with.
        • [16:32]=A0Open Discussion
          • Q.=A0[Emmanuel Baccelli, INRIA] Enthusiastic abo= ut this group. Concern: a lot of work. Prioritize the work. List of documen= ts, needs to be ordered according to priorities. Order things in time. Scop= e the charter more precisely.
          • A. [= Pascal Thubert] Point taken.
          • Q.=A0[Lars Eggert] Footprint for a device, are we able to run all this on a resource-c= onstrained device? RSVP, PANA are heavy-weight. May need to work on a light= weight version of these, nobody is working on it at this time in their resp= ective WG.
          • A. [= Thomas Watteyne] We have an open source implementation running (RP= L, CoAP, IEEE802.15.4e, no PANA, no RSVP). Footprint is about 4kB or ROM, 3= 5kB of flash.
          • Q.=A0[Lars Eggert] Be prepared to work without PHP.
          • Q= .=A0[Benedikt Stockebrand, Stepladder IT] Smalles= t microcontrollers known to run USB have 2kB of Flash, 128B of RAM (includi= ng CPU registers). Microcontrollers are very limited in resources. If we ge= t along this way, microcontrollers able to run this stack will simply be to= expensive to be usable.
          • A. [= Thomas Watteyne] It's a constant concern. Centralized reservat= ion is intended for very small footprint. This fits in decade year old MSP4= 30-based motes.
          • Q.=A0[Benedikt Stockebrand, Stepladder IT] A number o= f people are not aware of footprint.
          • Q.=A0[Carsten Bormann] We have a document= from the LWIG WG classifying microcontrollers. Class 1 (~10kB RAM, 100kB R= OM) smallest sized full citizen of the Internet. ZigBee IP typically on Cla= ss 2 device.
          • A. [= Thomas Watteyne] We target the class 1 devices.
          • Q.=A0[Rafa Marin-Lopez, University of Murcia] Clarification. We hav= e a PANA implemenation on Contiki OS on small Jennic device for class 1 mic= ro-controllers.
        • [16:41]=A0Questions
            Is this a topic= that the IETF should address?
            • hums for &qu= ot;yes" and for "no" did not produce a clear decision.
              • <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word">show of hands= : lots of "yes", a few "no", a handful "dunno"= ;.
          • Ar= e the goals of this WG clear, well-scoped, solvable, and useful?
            • 50/50 between yes and no
          • Q.=A0[Ralph Droms] Strange use of raising hands. Why not record hums?
          • A.=A0[=A0(?2)=A0] I prefer show of hands,= countable and unambiguous. Hums on depend on where you sit in room.
            • A.=A0[=A0(?3)=A0] Hums are good for getting sense of th= e room. If you don't get a good sense, you need to clarify.
          • Who is willi= ng to edit documents, comment documents, implement?
            • About 20-30 people raise hands.
          • Should a 6TSCH WG be formed?
          • Q.= =A0[=A0(?4)=A0] Clarifying question. As chartered? Topic i= s usual, but roles are not clear.
          • Q.=A0[Pascal Thubert] How should we work it out?
            • =
          • A.=A0[=A0(?5)=A0] You've gotten the useful data o= ut of the room already. There was clear support for "is the topic usef= ul". Are the goals clear? There was clear hesitation. That's the i= nformation you need to know.
          • A.=A0[=A0(?6)=A0] Use the posaitive energy that was s= hown here for improving the charter.
          • [Pascal]=A0Next step will be to work on the ML to on impro= ving the charter, and ask those who voted it was not clear to participate i= n clarifying the charter.
          • Q.=A0[Alex Petrescu] Back to question &qu= ot;is this a topic that the IETF should address?". Should also ask you= rselves if there is another SDO should address. Maybe this is something som= ebody else should work on.
          • A. [= Pascal Thubert] IETF is producing lots of components. It is dificu= lt to put them together. One of the goals is to package these components.
          • Q.=A0[Shahid Raza] WirelessHART is discussing IEEE802= .15.4e.
          • = A. [Pascal Thubert] Question is whether we can build the c= onvergence IT/OT.
        • [16:50]=A0End of meeting

    • --bcaec520e4f1c4360a04e37b6cdf-- From twatteyne@gmail.com Fri Aug 9 10:51:44 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9B28421F997E for <6tsch@ietfa.amsl.com>; Fri, 9 Aug 2013 10:51:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.857 X-Spam-Level: X-Spam-Status: No, score=-1.857 tagged_above=-999 required=5 tests=[AWL=0.120, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vnKPYbdeYJyX for <6tsch@ietfa.amsl.com>; Fri, 9 Aug 2013 10:51:43 -0700 (PDT) Received: from mail-pa0-x243.google.com (mail-pa0-x243.google.com [IPv6:2607:f8b0:400e:c03::243]) by ietfa.amsl.com (Postfix) with ESMTP id 6EB1621F9DF0 for <6tsch@ietf.org>; Fri, 9 Aug 2013 10:45:42 -0700 (PDT) Received: by mail-pa0-f67.google.com with SMTP id bg4so2156006pad.6 for <6tsch@ietf.org>; Fri, 09 Aug 2013 10:45:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=oXGi2K55cShsdIAXbozy0lgLCybfop9wB70NECjeQYQ=; b=iCRvxpgeEs9CXRaQ37VnrtlZzIMQ82g35uPfMAJ3PqFcqkxrLE/FCC16KL3Oy2py1c wW+3jEEH7Fjvv91YTN8YkaN4pbxsO92ZQYZYy+r3ZEoLlvRDKjtPtUYON4S76ETRlcZI AjyWLfZZGNJeNxfdleb79ZkJ73q68AuBHKPFcbBpFeIic7wWtwXDvjfx8lpyfghqhsO6 Yui+BiMJBbRq/oFtML5FZP1CBYijtuLpnjNBr74GxjA/kCLIFBmOOX/88x30mDMtRIGA ZMQAZy3f4jcgdzEyXDLp1bkf5sqdhbAhp5fegwe8KpgaKRrc0+rhOfOYYF7N0NAnDIzg e//A== X-Received: by 10.68.137.231 with SMTP id ql7mr12730855pbb.37.1376070342116; Fri, 09 Aug 2013 10:45:42 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 9 Aug 2013 10:45:21 -0700 (PDT) From: Thomas Watteyne Date: Fri, 9 Aug 2013 10:45:21 -0700 X-Google-Sender-Auth: X7Wn_GDBAEiqEJuWwfBPVKZZAVU Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b2e43c6ed8d2404e387575a Subject: [6tsch] minutes webex 9 August 2013 X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Aug 2013 17:51:44 -0000 --047d7b2e43c6ed8d2404e387575a Content-Type: text/plain; charset=ISO-8859-1 All, You will find the minutes of today's webex below. FYI, all the minutes and slides are archived a https://bitbucket.org/6tsch/meetings/. Thanks to Xavi for taking notes! As usual, fix anything we might have missed directly in the e-mail and reply. Thomas ----- Minutes Webex 09 August 2013, 6TSCH group Note: timestamps in PDT. Taking notes *(using Etherpad)* 1. Xavier Vilajosana 2. Thomas Watteyne Present *(alphabetically)* 1. Diego Dujovne 2. Guillaume Gaillard 3. Kris Pister 4. Pascal Thubert 5. Pouria Zand 6. Qin Wang 7. Raghuram Sudhaakar 8. Thomas Watteyne 9. Tom Phinney 10. Xavi Vilajosana Recording - Webex recording (audio+slides,streaming) - https://cisco.webex.com/ciscosales/lsr.php?AT=pb&SP=MC&rID=70524612&rKey=5bbefc20bc163741 *[60min]* Slides - slides_130809_webex.ppt: slides shared during the call Agenda - debrief Berlin *[2min]* - pre-BoF (minutes & outcome) - BoF (minutes & outcome) - revamped charter *[3min]* - overview of updates - new work items - discussions and open issues - "master plan" next steps *[10min]* - "Timeslot Management Methods and Formats" - what is it about? - what is it not about? - "minimal 6TSCH configuration" - rename draft and title? - work on RPL - relationship with TS mgt - towards demo/simulation/interop - we will ask for contributors and reviewers - 6TSCH architecture - distinguish current/future work wrt charter or remove future? - Technical discussion on "Timeslot Management Methods and Formats" * [25min]* - type of flows (push? pull?) - format (binary JSON? custom?) - reporting requirements (e.g. TS performance, alarms) - Technical discussion on "minimal 6TSCH configuration" *[10min]* - transport mechanism (CoAP?) - renaming group *[5min]* - statistics so far - next steps? - AOB *[2min]* Minutes - Pre-discussion: - *[Thomas,Qin]* OT vs IT and the term "convergence of IT and OT". Similar terms used in smart grid. - *[Raghuram]* Naming, what do we do? - *[08:03]* Agenda - wrap up what happen in Berlin - technical discussions at second half - end: renaming the group discussion - administrative: - cleaning minutes of pre-BoF and BoF - Do not formally approved today, but do it next week as they've been published recently. - Will be uploaded at the proceedings of IETF87 - debrief Berlin - pre-BoF (minutes & outcome) - BoF (minutes & outcome) - Next call to be approved. - Outcomes of the BoF: - clarity of goals was main concern. - highlight the changes done to the charter: - scope too big - identify first steps and focus the charter on that - charter reduced by half - from 7 to 3 work items - does not change what we want the solution to look like at the end. - IESG has no problem with WGs re-chartering, this is common procedure - revamped charter - new work items: - timeslot management methods and formats - minimal 6TSCH configuration - 6TSCH architecture (version 1): - will go to informal RFC, at each recharter a new RFC will be created. - Open Items: - hard-coded -> pre-configured - add PCE a WG to interact with. - rename BBR -> LBR. Sefinitions are very close. Suggestion is to use LBR so it is aligned to ROLL work. - *[Pascal]* pre-configured is not the same as hard-coded. Pre-configured has more complexity. - "master plan" next steps *[10min]* - How the different documents interact. - "Timeslot Management Methods and Formats" - what is it about? - how to format commands from the PCE to the note and information sent from the mote to the PCE (statistics, alarms, etc.). - identify the flow of what is moving on the network - bits and bytes of commands. What does the payload contain? - what is it not about? - NOT addressing the transport protocol - NOT the policy (when, etc..) - NOT a network management document (architecture) - *[Pascal]* PCE is not the right term. Better to refer to an "entity". - This is a new document not based on minimal configuration. - *[Qin]* does this work need to support both static and dynamic cases? - *[Thomas]* These formats will also be used in static case. This document will define the formats, this is in part preparatory work for the next charter which will address dynamic scheduling, where these formats then will be used for dynamic scheduling. - *[Guillaume]* Are we focusing on centralized cases? - *[Pascal]* The schedule is what is pushed at the beginning of the network and we run with it. Routing is dynamic, scheduling is static. - "minimal 6TSCH configuration" - rename draft and title? - Basic vs. minimal - make sure the title and filename are aligned. - At the end of the document, expose the need for a CoAP service where a schedule can be isntalled. - *[Qin]* the charter includes only static so the CoAP service is kind of dynamic. So address that on that dynamic. - not necessary to include that in the document. - *[Pascal]* we need a little bit of dynamism to cope with interop - more interesting cases. - *[Thomas]* Non-milestone items "interoperability guide", add the CoAP service there as a tool to support better interop testing. - *[Pascal]* There is windows to be able to modify the schedule, support the case of having a personalized schedule at each node. - *[Thomas]* In my mind, static schedule is synonymous to shared medium, no complete determinims, but you have connectivity on shared slots. Have RPL running and later have PCE working on the network. - *[Kris]* The idea is to have the minimum configuration to enable interop. - Work on RPL. - Relationship with timeslot management. - Towards demo/simulation/interop. - We will ask for contributors and reviewers. - "6TSCH architecture" - Do we distinguish what the current work to the future work? (future == real solution at the end of our work) - Have new revisions in RFCs that update the old ones. - In current architecture document, should we differentiate that? - Support centralized / distributed -- Keep it in the documents. It is a vision so we should keep it and highlit what goes to the charter. - Distinguish current/future work wrt charter or remove future? - *[08:41]* Introducing Diego Dujovne, new participant to calls. Has been following 6TSCH ML, was in Berlin. - *[08:42]* Technical discussion on "Timeslot Management Methods and Formats" - Types of control flow (push? pull?) - be able to give the commands to say: this config is for a time slot or for a bundle of time slots - define size of bundles. - Be able to install directly at each node, no 6top interaction. - How is the control flow (pull? push?). The devices waits? or the device pulls? need to be defined. - *[Thomas]* 3 flows: Management to node (inform), node to Management (report/inform), Node to management (alarm). - List the flows we need to support. - Format (binary JSON? custom?) - to look at bson (http://bsonspec.org/#/specification) - reporting requirements (e.g. timeslot performance, alarms) - what are the reporting requirements? - Technical discussion on "minimal 6TSCH configuration" *[10min]* - transport mechanism (CoAP?) - For now we will consider this into the interop document and not in the minimal draft. - related that to other WGs. - *[08:54]* Renaming group - Discussion probably came from fact that we need to stress more that "sixtus" is the pronunciation. - Lot's of pushing on the ML to keep the name 6TSCH. - *[Tom]* we can write "(sixtus)" after 6TSCH, a least during some time. - - Action item: *Pascal* to write e-mail to IESG about keeping acronym but writing "(sixtus)" right after. - *[09:00]* AOB No other business raised. - *[09:02]* meeting ends --047d7b2e43c6ed8d2404e387575a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    You will find the minut= es of today's webex below.

    FYI, all the minute= s and slides are archived a https://bitbucket.org/6tsch/meetings/.

    Thanks to Xavi for taking notes!

    As usual, fix anything we might have missed directly in the e-mail= and reply.

    Thomas

    -----<= /div>

    Minutes Webex 09 August 2013, 6TSCH group

    Note: timestamps in PDT.

    Taking notes=A0(using Etherpad)

    1. Xavier Vila= josana
    2. Thomas Watte= yne

    Present=A0(alphabetically)

    1. Diego Dujovne
    2. Guillaume Ga= illard
    3. K= ris Pister
    4. Pascal Thubert
    5. Pouria Zand
    6. Qin Wang
    7. Raghuram Sudhaakar
    8. Thomas Watteyne
    9. Tom Phinney
    10. Xavi Vilajosana

    Recording

    Slides

    Agenda

    • debrief Berl= in=A0[2min]
      • pre-BoF (minutes &= ; outcome)
      • BoF (minutes= & outcome)
    • revamped charter=A0[3min]
      • overview of = updates
      • = new work items
      • discussions and open issues
    • "master plan" next steps=A0[10m= in]
      • "Timeslot Management Methods and Formats"
        • what is it about?
        • what is it not about?
      • "minimal 6TSCH configuration"
        • rename draft and title?
        • work on RPL
        • relationship with TS mgt
        • towards demo/simulation/interop
        • we will ask for contributors and reviewers
        • 6TSCH = architecture
          • distinguish = current/future work wrt charter or remove future?
        • <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word">Technical dis= cussion on "Timeslot Management Methods and Formats"=A0[25min= ]
        • type of flow= s (push? pull?)
        • format (binary JSON? custom?)
        • reporting requirements (e.g. TS performance, alarms)
      • Technical discussion= on "minimal 6TSCH configuration"=A0[10min]
        • transport me= chanism (CoAP?)
      • renaming group=A0[5min]
        • statistics s= o far
        • ne= xt steps?
      • AOB=A0[2min]

      Minutes

      • Pre-discussi= on:
        • [Thomas,Qin]=A0OT vs = IT and the term "convergence of IT and OT". Similar terms used in= smart grid.
        • [Rag= huram]=A0Naming, what do we do?
      • [08:03]=A0Agenda
        • wrap up what= happen in Berlin
        • technical discussions at second half
        • end: renaming the group discussion
        • administrative:
          • cleaning minutes of pre-BoF and BoF
          • Do not forma= lly approved today, but do it next week as they've been published recen= tly.
          • Wil= l be uploaded at the proceedings of IETF87
      • debrief Berlin
        • pre-BoF (minutes &a= mp; outcome)
        • BoF (minutes= & outcome)
        • Next call to be approved.
        • Outcomes of the BoF:
          • clarity of goals was = main concern.
        • highlight the changes done to the charter:
          • scope too big
          • identify first steps and focus the charter on that
          • charter reduced by half
          • from 7 to 3 work= items
          • does not cha= nge what we want the solution to look like at the end.
          • IESG has no problem with WGs= re-chartering, this is common procedure
      • revamped charter
        • new work items:
        • timeslot man= agement methods and formats
        • minimal 6TSCH configuration
        • 6TSCH architecture (version 1):
          • will go to= informal RFC, at each recharter a new RFC will be created.
      • Open It= ems:
        • hard-coded -> pre-configured
          • <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word"> add PCE a WG to interact with.
        • rename BBR -> LBR. Sefinitions are very close. Su= ggestion is to use LBR so it is aligned to ROLL work.
        • [Pascal]=A0pre-configured is not the same as hard-coded. P= re-configured has more complexity.
    • "master plan" next= steps=A0[10min]
      • How the diff= erent documents interact.
      • "Timeslot Management Methods and Formats"
        • what is it a= bout?
          • how to format commands from the PCE = to the note and information sent from the mote to the PCE (statistics, alar= ms, etc.).
          • identify the= flow of what is moving on the network
          • bits and bytes of commands. What does the pa= yload contain?
        • wh= at is it not about?
          • NOT addressing the tr= ansport protocol
          • NOT the poli= cy (when, etc..)
          • NOT a network management document (architecture)
          • [Pascal]=A0PCE is not the right term. Better to refer to a= n "entity".
        • This is a new document not based on minimal configuration.
        • [Qin= ]=A0does this work need to support both static and dynamic cases?<= /li>
        • = [Thomas]=A0These formats will also be used in static case. This do= cument will define the formats, this is in part preparatory work for the ne= xt charter which will address dynamic scheduling, where these formats then = will be used for dynamic scheduling.
        • [Gui= llaume]=A0Are we focusing on centralized cases?
        • [Pascal]= =A0The schedule is what is pushed at the beginning of the network and we ru= n with it. Routing is dynamic, scheduling is static.
      • &q= uot;minimal 6TSCH configuration"
        • rena= me draft and title?
          • Basic vs. mi= nimal - make sure the title and filename are aligned.
          • At the end of the document, e= xpose the need for a CoAP service where a schedule can be isntalled.
          • [Qin= ]=A0the charter includes only static so the CoAP service is kind o= f dynamic. So address that on that dynamic.
            • not necessar= y to include that in the document.
          • [Pascal]=A0we need a = little bit of dynamism to cope with interop - more interesting cases.
          • [Tho= mas]=A0Non-milestone items "interoperability guide", add= the CoAP service there as a tool to support better interop testing.
            • [Pascal]=A0There is windows to be able to modify the sched= ule, support the case of having a personalized schedule at each node.<= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word">[Thom= as]=A0In my mind, static schedule is synonymous to shared medium, = no complete determinims, but you have connectivity on shared slots. Have RP= L running and later have PCE working on the network.
          • [Kri= s]=A0The idea is to have the minimum configuration to enable inter= op.
        • Work on RPL.
        • Relationship with timeslot management.
        • Towards demo/simulation/interop.
          • We will ask for contributors and reviewers.
      • "6TSCH architecture"= ;
        • Do we distinguish what the current work to the future work? (future =3D=3D = real solution at the end of our work)
        • Have new revisions in RFCs that update the ol= d ones.
        • In current a= rchitecture document, should we differentiate that?
        • Support centralized / distribut= ed -- Keep it in the documents. It is a vision so we should keep it and hig= hlit what goes to the charter.
        • Distinguish = current/future work wrt charter or remove future?
      • <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word">[08:41]=A0Introducing=A0Diego Dujovne, new part= icipant to calls. Has been following 6TSCH ML, was in Berlin.
    • [08:42]<= /em>=A0Technical discussion on "Timeslot Management Methods and Format= s"
      • Types of control flow (push? pull?)
        • be abl= e to give the commands to say: this config is for a time slot or for a bund= le of time slots
        • define size = of bundles.
        • Be able to install directly at each node, no 6top interaction.
        • How is the control flow (pull? push?). The devices waits? or the device pul= ls? need to be defined.
        • [Thomas]=A03 flows: Management to node (in= form), node to Management (report/inform), Node to management (alarm).
        • List the flo= ws we need to support.
      • Format (binary JSON? custom?)
      • re= porting requirements (e.g. timeslot performance, alarms)
        • what are the reporting requirements?
    • Technical discussion on &q= uot;minimal 6TSCH configuration"=A0[10min]
      • transport me= chanism (CoAP?)
        • For now we will consider t= his into the interop document and not in the minimal draft.
        • related that= to other WGs.
    • [08:54]=A0Renaming group
      • Discussion p= robably came from fact that we need to stress more that "sixtus" = is the pronunciation.
      • Lot's of pushing on the ML to keep the name 6TSCH.
      • [Tom]=A0we = can write "(sixtus)" after 6TSCH, a least during some time.
      • Action = item:=A0Pascal=A0to write e-mail to IESG about keeping acr= onym but writing "(sixtus)" right after.
    • [09:00]=A0AOB

      No other business raised.

    • [09:02]=A0meeting ends
    --047d7b2e43c6ed8d2404e387575a-- From xvilajosana@berkeley.edu Fri Aug 9 11:40:52 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 05EB321F9CF7 for <6tsch@ietfa.amsl.com>; Fri, 9 Aug 2013 11:40:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.176 X-Spam-Level: X-Spam-Status: No, score=-2.176 tagged_above=-999 required=5 tests=[AWL=-0.200, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4XxjTOP2NYUe for <6tsch@ietfa.amsl.com>; Fri, 9 Aug 2013 11:40:47 -0700 (PDT) Received: from mail-pd0-f172.google.com (mail-pd0-f172.google.com [209.85.192.172]) by ietfa.amsl.com (Postfix) with ESMTP id E40C721F9D68 for <6tsch@ietf.org>; Fri, 9 Aug 2013 11:32:26 -0700 (PDT) Received: by mail-pd0-f172.google.com with SMTP id z10so876404pdj.3 for <6tsch@ietf.org>; Fri, 09 Aug 2013 11:32:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:date:message-id:subject :from:to:content-type; bh=whPoSoqVLSixFGMl5yuaMF8QMwNd8wEgLoLtCIMTIo0=; b=BzKtP0ckyj55n5a7TaY0pMeMjsdLYkP5B7khUw3WZRqlA5859CPhPJ6QPO3L1oXaNW +tqFJjOd5QWBY/ypE/r/KbUx0w8NwnWOPa/o5dgBNCS4FvD6xvxJ8Ghr7LIT4Xad3tm5 5/tFZVaL/L7XVoPRqMsYvBpbhs2a9GMTKaqFRB7V8osijTjxGwU/pQLrqnedoU+wCLPF 8uSdWmoOsBeh3Y2eIW2KvWs2gFfRUwIOEIq++4yH7BYpo0YK/wlmBx6ebfjZ2A1HKo97 ZzIkcc4IdOpzDKSNLArBcgP88wUkz+XwKQCyNcqhKKJpCGv5jdbCit2gqHcHQpX2plYT hqtA== X-Gm-Message-State: ALoCoQmkRSFasHeyfE3xPdrFjO2q+edkDGNYrN3v/UtuyqyZho8qeTsdJnWgd0c62ch3UbMFQRBi MIME-Version: 1.0 X-Received: by 10.66.240.67 with SMTP id vy3mr1945989pac.141.1376073146662; Fri, 09 Aug 2013 11:32:26 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Fri, 9 Aug 2013 11:32:26 -0700 (PDT) Date: Fri, 9 Aug 2013 11:32:26 -0700 Message-ID: From: Xavier Vilajosana Guillen To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b15ab7f178bef04e387ffba Subject: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Aug 2013 18:40:52 -0000 --047d7b15ab7f178bef04e387ffba Content-Type: text/plain; charset=ISO-8859-1 Hi all, after discussion today I would like to start working on the contents that we want regarding RPL on Basic TSCH. Here I list some points I guess should go there: -RPL objective function calculation using Neighbors information described in Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a basic configuration) - DIO period. Whether we use trickle algorithm (and we define the initial period) or we use a fix period for DIO (no trickle) for basic configuration. -DAO period, idem. I kindly ask for opinions and contribution to this items so we can start narrowing the content. thanks! X --047d7b15ab7f178bef04e387ffba Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi all,
    <= br>
    after discussion today I would like to start working on the conten= ts that we want regarding RPL on Basic TSCH. Here I list some points I gues= s should go there:

    -RPL objective function calculation using Neighbors information d= escribed in Basic configuration.
    =A0=A0=A0 -this includes how OF = is calculated using numTx and numTxACK, etc..
    -RPL configuration:=
    =A0=A0=A0=A0 - storing mode vs non-storing mode (I vote for non-stori= ng mode for a basic configuration)
    =A0=A0=A0=A0 - DIO period. Whet= her we use trickle algorithm (and we define the initial period) or we use a= fix period for DIO (no trickle) for basic configuration.
    =A0=A0=A0=A0=A0 -DAO period, idem.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= br>
    thanks!
    X
    --047d7b15ab7f178bef04e387ffba-- From twatteyne@gmail.com Mon Aug 12 10:08:50 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2F72121F9CEA for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:08:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.862 X-Spam-Level: X-Spam-Status: No, score=-1.862 tagged_above=-999 required=5 tests=[AWL=0.115, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gZrpbvObBuPU for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:08:49 -0700 (PDT) Received: from mail-pa0-x231.google.com (mail-pa0-x231.google.com [IPv6:2607:f8b0:400e:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id 3C23321F9E05 for <6tsch@ietf.org>; Mon, 12 Aug 2013 09:52:45 -0700 (PDT) Received: by mail-pa0-f49.google.com with SMTP id ld10so3182391pab.36 for <6tsch@ietf.org>; Mon, 12 Aug 2013 09:52:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=k2WzgcoMwUCuVaVn6J+93HE6otZPtJL5YLVfbruWT9E=; b=gZCEpEI8a1yfWcJ6xj6BiFQqPj1Mq8tR90r99QzF6BX/TR4tKdP0F3Tv1DFGqMsaee vO9aZBZyYOTuxRqs4SYyZh9JTFln08PO8h6Bed8lp3U3Yda+I/KY9AL1X9VmkZgMvb6V em1IicdxHNwYSRYx0SPKYWRUSPLvTegsaN9pQJOrwuuh1ek4gAcQ0YNmBOqh93agsjBB FNdTzBg5No0f7Gb+t88stEV8zUHvZhcX1G5RcFACRHIVmevhwtyecd0rWMet6RJvCsXV yVOzcDU8TAF8WS2FtkE+rwMQhuSb+tkwXNs4yxMW5ZjQ0kvWIHXMY7jWiLEhAmqDmRb7 IqtA== X-Received: by 10.66.142.107 with SMTP id rv11mr25085pab.17.1376326351060; Mon, 12 Aug 2013 09:52:31 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Mon, 12 Aug 2013 09:52:10 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Mon, 12 Aug 2013 09:52:10 -0700 X-Google-Sender-Auth: HVFrsHmUZLNZGqFvGCE5DyTjomE Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=001a11331e464002eb04e3c2f3d7 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 17:08:50 -0000 --001a11331e464002eb04e3c2f3d7 Content-Type: text/plain; charset=ISO-8859-1 Xavi, I believe this is a good first list. It might be interesting to go over RFC6552 with TSCH eyes, and see whether there is anything that would prevent us from using that as-is. It would certainly be nice if we could. Thomas On Fri, Aug 9, 2013 at 11:32 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi all, > > after discussion today I would like to start working on the contents that > we want regarding RPL on Basic TSCH. Here I list some points I guess should > go there: > > -RPL objective function calculation using Neighbors information described > in Basic configuration. > -this includes how OF is calculated using numTx and numTxACK, etc.. > -RPL configuration: > - storing mode vs non-storing mode (I vote for non-storing mode for a > basic configuration) > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration. > -DAO period, idem. > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content. > > thanks! > X > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --001a11331e464002eb04e3c2f3d7 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Xavi,

    I believe this is a good first li= st. It might be interesting to go over RFC6552 with TSCH eyes, and see whet= her there is anything that would prevent us from using that as-is. It would= certainly be nice if we could.

    Thomas



    On Fri, Aug 9, 2013 at 11:32 AM, Xa= vier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>= wrote:
    Hi all,

    after discussion today I would like= to start working on the contents that we want regarding RPL on Basic TSCH.= Here I list some points I guess should go there:

    -RPL objective function calculation using Neighbors information d= escribed in Basic configuration.
    =A0=A0=A0 -this includes how OF = is calculated using numTx and numTxACK, etc..
    -RPL configuration:=
    =A0=A0=A0=A0 - storing mode vs non-storing mode (I vote for non-stori= ng mode for a basic configuration)
    =A0=A0=A0=A0 - DIO period. Whet= her we use trickle algorithm (and we define the initial period) or we use a= fix period for DIO (no trickle) for basic configuration.
    =A0=A0=A0=A0=A0 -DAO period, idem.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= br>
    thanks!
    X

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --001a11331e464002eb04e3c2f3d7-- From xvilajosana@berkeley.edu Mon Aug 12 10:24:02 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6A22D21F9B03 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:24:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.643 X-Spam-Level: X-Spam-Status: No, score=-2.643 tagged_above=-999 required=5 tests=[AWL=0.333, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lypTSK17kPMV for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:23:58 -0700 (PDT) Received: from mail-pb0-f42.google.com (mail-pb0-f42.google.com [209.85.160.42]) by ietfa.amsl.com (Postfix) with ESMTP id D392821F9DAA for <6tsch@ietf.org>; Mon, 12 Aug 2013 10:19:17 -0700 (PDT) Received: by mail-pb0-f42.google.com with SMTP id un15so7023749pbc.15 for <6tsch@ietf.org>; Mon, 12 Aug 2013 10:19:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=XzW2z1vRV3LRTLgSHOiJJ1Yty6SWe7vviKYUbNpgpWc=; b=aztevhMP1zu17JKxLfTDin0DuBarfzbnmeI1DFpleUMJF6aG9VM0CRkROM5iL01J+A JsO0jYs0TDE8p7quaBaPZkpU4MUGrpmc+5V8FIQKhPx2n7KOIlR68zZcRiqA6YSfDHEy kYm10tko/KMJRoc4oQszEhIweAVHJkeSDOZnhl8gb1KPKSuCL2TH7WaLWE+K/rvxN4zJ n9yWlVTtvljZRH//qZLezICiQYg3vK4rP99V6XIPBt7ag9lzPPaBjz4VYGZ43HAfvC0F EG8pSeR5pgT6CEgCmX9xWprgjTKsEhC2Hwm1O9sY3mKFfGGA6L3Oqg6Af1COFZHjVmJy iJSw== X-Gm-Message-State: ALoCoQkwrDy7aKLH2JJqPJHugZYo9zlgJEyT1i/U9ioAWaYFFGYysH26zBzMVBPbzd7P7AmUn+Jp MIME-Version: 1.0 X-Received: by 10.68.136.7 with SMTP id pw7mr114379pbb.106.1376327957604; Mon, 12 Aug 2013 10:19:17 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Mon, 12 Aug 2013 10:19:17 -0700 (PDT) In-Reply-To: References: Date: Mon, 12 Aug 2013 10:19:17 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7b15a9d301f97904e3c35329 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 17:24:02 -0000 --047d7b15a9d301f97904e3c35329 Content-Type: text/plain; charset=ISO-8859-1 Thanks Thomas, I will do. cheers! x On Mon, Aug 12, 2013 at 9:52 AM, Thomas Watteyne wrote: > Xavi, > > I believe this is a good first list. It might be interesting to go over > RFC6552 with TSCH eyes, and see whether there is anything that would > prevent us from using that as-is. It would certainly be nice if we could. > > Thomas > > > > On Fri, Aug 9, 2013 at 11:32 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote: > >> Hi all, >> >> after discussion today I would like to start working on the contents that >> we want regarding RPL on Basic TSCH. Here I list some points I guess should >> go there: >> >> -RPL objective function calculation using Neighbors information described >> in Basic configuration. >> -this includes how OF is calculated using numTx and numTxACK, etc.. >> -RPL configuration: >> - storing mode vs non-storing mode (I vote for non-storing mode for >> a basic configuration) >> - DIO period. Whether we use trickle algorithm (and we define the >> initial period) or we use a fix period for DIO (no trickle) for basic >> configuration. >> -DAO period, idem. >> >> I kindly ask for opinions and contribution to this items so we can start >> narrowing the content. >> >> thanks! >> X >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b15a9d301f97904e3c35329 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Thanks Thomas, I will do.

    cheers!
    x


    On Mon, Aug 12, 2013 at 9:52 AM, Thomas Watteyne &l= t;watteyne@= eecs.berkeley.edu> wrote:
    Xavi,

    I = believe this is a good first list. It might be interesting to go over RFC65= 52 with TSCH eyes, and see whether there is anything that would prevent us = from using that as-is. It would certainly be nice if we could.

    Thomas



    On Fri, Aug = 9, 2013 at 11:32 AM, Xavier Vilajosana Guillen <xvilajosana@ee= cs.berkeley.edu> wrote:
    Hi all,

    after discussion today I would like to start working on the contents that = we want regarding RPL on Basic TSCH. Here I list some points I guess should= go there:

    -RPL objective function calculation using Neighbors information d= escribed in Basic configuration.
    =A0=A0=A0 -this includes how OF = is calculated using numTx and numTxACK, etc..
    -RPL configuration:=
    =A0=A0=A0=A0 - storing mode vs non-storing mode (I vote for non-stori= ng mode for a basic configuration)
    =A0=A0=A0=A0 - DIO period. Whet= her we use trickle algorithm (and we define the initial period) or we use a= fix period for DIO (no trickle) for basic configuration.
    =A0=A0=A0=A0=A0 -DAO period, idem.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= br>
    thanks!
    X
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b15a9d301f97904e3c35329-- From qinwang@berkeley.edu Mon Aug 12 10:42:12 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 77ACA21F94FF for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:42:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.838 X-Spam-Level: X-Spam-Status: No, score=-2.838 tagged_above=-999 required=5 tests=[AWL=0.138, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WcVHec3PdqMV for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:42:05 -0700 (PDT) Received: from mail-ve0-f182.google.com (mail-ve0-f182.google.com [209.85.128.182]) by ietfa.amsl.com (Postfix) with ESMTP id 9821021F9BB6 for <6tsch@ietf.org>; Mon, 12 Aug 2013 10:39:35 -0700 (PDT) Received: by mail-ve0-f182.google.com with SMTP id m1so5795504ves.41 for <6tsch@ietf.org>; Mon, 12 Aug 2013 10:39:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=hJUdgkB8k8QX6pk61XzCSNf3j+I9i8dVKSw6F7yBHZ8=; b=RPsu5H51yssNOhR64DxKoWaiSFXedMKBzlbdDy4gOCPxVEqRHLEokeOJm486E/YZQ+ 3a4EThIvcAsV5aIbD5TeqKLjaqN9KPKjLvaNm9Dp7XiTlAKM57Mg9JuFaOG1ij71gZyR gYiSgAEo+y6zW8KCxw+yi2W/3/+Ye9jB7fiW2tb/rfQdCMR1oU2SyOWFU3hUWTBM0Y5I SVEVfNwh9xsH/m+8JC1J/woLmiMiRvFna/e5jy5X+mLaU2x4UQq+ld7dq7//EBX3sf/f /R32JAZ7Gc9IO+GooMywRq/8TuDytnVFbxzpct6qColHpYvOPDPrjmNtkxB7AbGYC4fV +M8A== X-Gm-Message-State: ALoCoQmT9DtTjQwhEaXyykjIuSCQ7fev66zh03q42JzO3v7+R/Ybqi4cW1FnDjBk2iWMqL5ZH5W3 MIME-Version: 1.0 X-Received: by 10.220.13.15 with SMTP id z15mr119828vcz.46.1376329175220; Mon, 12 Aug 2013 10:39:35 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Mon, 12 Aug 2013 10:39:35 -0700 (PDT) Date: Tue, 13 Aug 2013 01:39:35 +0800 Message-ID: From: Qin Wang To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=001a11c3eb66954ecd04e3c39b24 Subject: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 17:42:17 -0000 --001a11c3eb66954ecd04e3c39b24 Content-Type: text/plain; charset=ISO-8859-1 Hi Pascal, During the teleconference on last Friday, you mentioned that we will investigate Binary JSON to define the message formats. I'm not very clear about what is the relationship between the Binary JSON coding and 802.15.4e Information Element. I guess that we will still use IEs to carry the 6top messages, but for those IE coding, we will use Binary JSON. Correct? By the way, what is the advantage to use Binary JSON format? What are your main considerations? Thanks Qin --001a11c3eb66954ecd04e3c39b24 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Pascal,

    During the teleconference on= last Friday, you mentioned that we will investigate Binary JSON to define = the message formats. I'm not very clear about what is the relationship = between the Binary JSON coding and 802.15.4e Information Element. I guess t= hat we will still use IEs to carry the 6top messages, but for those IE codi= ng, we will use Binary JSON. Correct?

    By the way, what is the advantage to use Binary JSON fo= rmat? What are your main considerations?

    Thanks
    Qin
    --001a11c3eb66954ecd04e3c39b24-- From xvilajosana@berkeley.edu Mon Aug 12 10:47:21 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D368C21F967C for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:47:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.19 X-Spam-Level: X-Spam-Status: No, score=-2.19 tagged_above=-999 required=5 tests=[AWL=-0.214, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KpkJjOeK9iUm for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:47:17 -0700 (PDT) Received: from mail-pd0-f170.google.com (mail-pd0-f170.google.com [209.85.192.170]) by ietfa.amsl.com (Postfix) with ESMTP id 8ED6421F9956 for <6tsch@ietf.org>; Mon, 12 Aug 2013 10:46:59 -0700 (PDT) Received: by mail-pd0-f170.google.com with SMTP id x10so3755256pdj.1 for <6tsch@ietf.org>; Mon, 12 Aug 2013 10:46:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=E61AnIsvhHdtEBME3/0fA3XOhfoQ+VM2qY2NNZnJ6Lo=; b=DJLRSeIOcF7mjZe1sBownJEbsUsb3uxPItP/jJ/rSU1fXqZ80lREkxXzYNVoSLnazI 4hb82Ac1dulG7o/FBSLrcl+Q4D1Zxgf7Zh2PVgL3v/iiQdYmh6armwyso3FoNc+IsJdE KOsFRCsCS3ZLgg+ZlXCkdtNx/bokIe8g3dpSPgmcaX+ZJ6ZgbIvMvEHdngkVR0mDCCrz PTkgdclJooxDTSsoxW/GCwdSYF4kTV6TREziEIasSPbLK6iJVKRb/lC6NM2c6sUmNY5t 0886/XYwci1FNAK1OnRzy3Tle07NFsdOIvt6MnAuvhXdgLwOERvDWyp3wrea13BbDi+s 6Smg== X-Gm-Message-State: ALoCoQmuCpYksInB/9cuWYg7EWzSrd6OY52YbdEka08rDRzZ+PGAZvM64ZqOo0eE2dTHWivIMhdg MIME-Version: 1.0 X-Received: by 10.68.171.165 with SMTP id av5mr243778pbc.18.1376329619181; Mon, 12 Aug 2013 10:46:59 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Mon, 12 Aug 2013 10:46:59 -0700 (PDT) In-Reply-To: References: Date: Mon, 12 Aug 2013 10:46:59 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=047d7b86f77e0b990304e3c3b645 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 17:47:22 -0000 --047d7b86f77e0b990304e3c3b645 Content-Type: text/plain; charset=ISO-8859-1 Hi Qin, my feeling is that BSON will go in the packet from the PCE to the mote that has to be scheduled. This is a higher layer issue and relates to the payload of a CoAP packet sent from the PCE to the mote (and viceversa). I don't think that 6top needs BSON as an encoding for the IEs. does it make sense? X On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang wrote: > Hi Pascal, > > During the teleconference on last Friday, you mentioned that we will > investigate Binary JSON to define the message formats. I'm not very clear > about what is the relationship between the Binary JSON coding and 802.15.4e > Information Element. I guess that we will still use IEs to carry the 6top > messages, but for those IE coding, we will use Binary JSON. Correct? > > By the way, what is the advantage to use Binary JSON format? What are your > main considerations? > > Thanks > Qin > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b86f77e0b990304e3c3b645 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Qin,

    my feeling is that BSON wi= ll go in the packet from the PCE to the mote that has to be scheduled. This= is a higher layer issue and relates to the payload of a CoAP packet sent f= rom the PCE to the mote (and viceversa). I don't think that 6top needs = BSON as an encoding for the IEs.

    does it make sense?
    X

    =
    On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang <= span dir=3D"ltr"><qinwang@berkeley.edu> wrote:
    Hi Pascal,

    During the teleconference on last Friday, you mentioned that we will inv= estigate Binary JSON to define the message formats. I'm not very clear = about what is the relationship between the Binary JSON coding and 802.15.4e= Information Element. I guess that we will still use IEs to carry the 6top = messages, but for those IE coding, we will use Binary JSON. Correct?

    By the way, what is the advantage to use Binary JSON fo= rmat? What are your main considerations?

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b86f77e0b990304e3c3b645-- From qinwang@berkeley.edu Mon Aug 12 10:56:49 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C04CC21F9D71 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:56:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.847 X-Spam-Level: X-Spam-Status: No, score=-2.847 tagged_above=-999 required=5 tests=[AWL=0.129, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XL+1UWG75806 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 10:56:36 -0700 (PDT) Received: from mail-vb0-f45.google.com (mail-vb0-f45.google.com [209.85.212.45]) by ietfa.amsl.com (Postfix) with ESMTP id 2E97021F9D07 for <6tsch@ietf.org>; Mon, 12 Aug 2013 10:56:35 -0700 (PDT) Received: by mail-vb0-f45.google.com with SMTP id e15so5938774vbg.18 for <6tsch@ietf.org>; Mon, 12 Aug 2013 10:56:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=hMe0auCBF8qi2tmWK8mZtE4PJeq3ha8n1MPkurZvIO4=; b=oYWqMkC/NPmuZTcCSlUNWSaPcoNEyN451cUTidWuDj3NS6c8cOUpYdlQmmBORf+W4X ue1BSn/CnR5eI9m4n+2lpN4xbHDVJ8eOjvz0PabxgSdu0s9gGUFINWVsPUb5mu8SnB9f 9BAUGZnrBbfGlPDziF7bPYfiEHgq7vwR2sFyzZgdCEUysEDfabnLc9q9EZzL0BdXnZmr SxLU1mEYRzBOSEBbG97rc9PeJTYADmlsEzpjqABwA4+JmyB9S5krC3o2aWnR/gTia/H2 JxGkWll8hxJrRr/X0CPVCufdfcpXHU65qjnz4VyhpUUHubYT0kObf5FiXnmaCysjV9fN vLew== X-Gm-Message-State: ALoCoQmFDnINU+IZpQOpr0cs5gzxGwu/DM3tns7tjES4HT5E3P1cBkfIIwKc3WvWdEnkbYRdg3OH MIME-Version: 1.0 X-Received: by 10.58.128.71 with SMTP id nm7mr162339veb.51.1376330193964; Mon, 12 Aug 2013 10:56:33 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Mon, 12 Aug 2013 10:56:33 -0700 (PDT) In-Reply-To: References: Date: Tue, 13 Aug 2013 01:56:33 +0800 Message-ID: From: Qin Wang To: Xavier Vilajosana Guillen Content-Type: multipart/alternative; boundary=047d7b60518c4e1b8604e3c3d87b Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 17:56:49 -0000 --047d7b60518c4e1b8604e3c3d87b Content-Type: text/plain; charset=ISO-8859-1 Xavi, It make more sense to use BSON in higher layer message definition. But if so, why it should be included in the document "Timeslot management methods and format" ? My understanding is the document is about 6top, so the format in the document refers to the format of 6top packets. Please point out where I'm wrong. Thanks Qin On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi Qin, > > my feeling is that BSON will go in the packet from the PCE to the mote > that has to be scheduled. This is a higher layer issue and relates to the > payload of a CoAP packet sent from the PCE to the mote (and viceversa). I > don't think that 6top needs BSON as an encoding for the IEs. > > does it make sense? > X > > > On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang wrote: > >> Hi Pascal, >> >> During the teleconference on last Friday, you mentioned that we will >> investigate Binary JSON to define the message formats. I'm not very clear >> about what is the relationship between the Binary JSON coding and 802.15.4e >> Information Element. I guess that we will still use IEs to carry the 6top >> messages, but for those IE coding, we will use Binary JSON. Correct? >> >> By the way, what is the advantage to use Binary JSON format? What are >> your main considerations? >> >> Thanks >> Qin >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > --047d7b60518c4e1b8604e3c3d87b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Xavi,

    It make more sense to use BSON in= higher layer message definition.=A0

    But if so, wh= y it should be included in the document "Timeslot management methods a= nd format" ? My understanding is the document is about 6top, so the fo= rmat in the document refers to the format of 6top packets. Please point out= where I'm wrong.

    Thanks
    Qin


    On Tue, Aug 13, 2013 at 1:46 AM, Xav= ier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu><= /span> wrote:
    Hi Qin,

    <= /div>my feeling is that BSON will go in the packet from the PCE to the mote= that has to be scheduled. This is a higher layer issue and relates to the = payload of a CoAP packet sent from the PCE to the mote (and viceversa). I d= on't think that 6top needs BSON as an encoding for the IEs.

    does it make sense?
    X

    =
    On Mon, Aug 12, 2013 = at 10:39 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Pascal,

    During the teleconference on last Fr= iday, you mentioned that we will investigate Binary JSON to define the mess= age formats. I'm not very clear about what is the relationship between = the Binary JSON coding and 802.15.4e Information Element. I guess that we w= ill still use IEs to carry the 6top messages, but for those IE coding, we w= ill use Binary JSON. Correct?

    By the way, what is the advantage to use Binary JSON fo= rmat? What are your main considerations?

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    --047d7b60518c4e1b8604e3c3d87b-- From xvilajosana@berkeley.edu Mon Aug 12 11:02:39 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 39FC521F95DC for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 11:02:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.664 X-Spam-Level: X-Spam-Status: No, score=-2.664 tagged_above=-999 required=5 tests=[AWL=0.312, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kcEsWjxCIfmK for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 11:02:35 -0700 (PDT) Received: from mail-pa0-f45.google.com (mail-pa0-f45.google.com [209.85.220.45]) by ietfa.amsl.com (Postfix) with ESMTP id 0783221F9CA8 for <6tsch@ietf.org>; Mon, 12 Aug 2013 11:02:31 -0700 (PDT) Received: by mail-pa0-f45.google.com with SMTP id bg4so7798158pad.18 for <6tsch@ietf.org>; Mon, 12 Aug 2013 11:02:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=ZecmNZqR1Xr2WpHirzJkvASOaaP1mpmG7sLCF6JqTEw=; b=keMiUJflLTSvDmAkDOWkSdAL7nrMai2M3u0ydBc98agzQEpxypKZA6OgepgHKcsi0B lcwCHL8j6zHdV7dJciXJTv1DKm/PMwCHcLRkAKWvsZQFa5CHHaa/z50qjVaE1dZ2f/Mk n2khqKsOnG0wur+y0EfU0uHOScYiPv01bY/4GopQ/uNU+ZZ1ErkmjBGTAXr0T9yzAQBg kNQ6N4GnnAXX2WwodZkVf/0moEkB8jy6C3DzMSROvk8JGv0MN4HJJdx49kcBl8V13P9A 9BezXfLNrCQc75rEQDRZipPPxjt1LoBy/3gFrpbIE7mQS0VbC+K48io6MGPd8V9CXwis ei6g== X-Gm-Message-State: ALoCoQlPyjgrKnWb0u9cb3Spy9WFCwfhKRpjsW4QSPze//0C8K2OmCLLtA4Su7uh6Tgw3ULd61Zf MIME-Version: 1.0 X-Received: by 10.68.136.7 with SMTP id pw7mr279745pbb.106.1376330551567; Mon, 12 Aug 2013 11:02:31 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Mon, 12 Aug 2013 11:02:31 -0700 (PDT) In-Reply-To: References: Date: Mon, 12 Aug 2013 11:02:31 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=047d7b15a9d39eb38004e3c3edd4 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 18:02:39 -0000 --047d7b15a9d39eb38004e3c3edd4 Content-Type: text/plain; charset=ISO-8859-1 Hi Qin, I think that the work item aims to define the packet format of the messages that will transport the schedule information, this is on top of 6top. 6top has the API to handle that information and use its own messages (using its IEs) to install the schedule in both sides of a link (if there is connectivity between the two nodes). X On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang wrote: > Xavi, > > It make more sense to use BSON in higher layer message definition. > > But if so, why it should be included in the document "Timeslot management > methods and format" ? My understanding is the document is about 6top, so > the format in the document refers to the format of 6top packets. Please > point out where I'm wrong. > > Thanks > Qin > > > On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote: > >> Hi Qin, >> >> my feeling is that BSON will go in the packet from the PCE to the mote >> that has to be scheduled. This is a higher layer issue and relates to the >> payload of a CoAP packet sent from the PCE to the mote (and viceversa). I >> don't think that 6top needs BSON as an encoding for the IEs. >> >> does it make sense? >> X >> >> >> On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang wrote: >> >>> Hi Pascal, >>> >>> During the teleconference on last Friday, you mentioned that we will >>> investigate Binary JSON to define the message formats. I'm not very clear >>> about what is the relationship between the Binary JSON coding and 802.15.4e >>> Information Element. I guess that we will still use IEs to carry the 6top >>> messages, but for those IE coding, we will use Binary JSON. Correct? >>> >>> By the way, what is the advantage to use Binary JSON format? What are >>> your main considerations? >>> >>> Thanks >>> Qin >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> > --047d7b15a9d39eb38004e3c3edd4 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Qin,

    I think that the work item = aims to define the packet format of the messages that will transport the sc= hedule information, this is on top of 6top. 6top has the API to handle that= information and use its own messages (using its IEs) to install the schedu= le in both sides of a link (if there is connectivity between the two nodes)= .

    X


    On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang <qinwang@berkeley.ed= u> wrote:
    Xavi,

    It= make more sense to use BSON in higher layer message definition.=A0

    But if so, why it should be included in the document "Times= lot management methods and format" ? My understanding is the document = is about 6top, so the format in the document refers to the format of 6top p= ackets. Please point out where I'm wrong.

    Thanks
    Qin


    On Tue, Au= g 13, 2013 at 1:46 AM, Xavier Vilajosana Guillen <xvilajosana@= eecs.berkeley.edu> wrote:
    Hi Qin,

    <= /div>my feeling is that BSON will go in the packet from the PCE to the mote= that has to be scheduled. This is a higher layer issue and relates to the = payload of a CoAP packet sent from the PCE to the mote (and viceversa). I d= on't think that 6top needs BSON as an encoding for the IEs.

    does it make sense?
    X

    =
    On Mon, Aug 12, 2013 at 10:39 AM, = Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Pa= scal,

    During the teleconference on last Friday, you ment= ioned that we will investigate Binary JSON to define the message formats. I= 'm not very clear about what is the relationship between the Binary JSO= N coding and 802.15.4e Information Element. I guess that we will still use = IEs to carry the 6top messages, but for those IE coding, we will use Binary= JSON. Correct?

    By the way, what is the advantage to use Binary JSON fo= rmat? What are your main considerations?

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch




    --047d7b15a9d39eb38004e3c3edd4-- From pthubert@cisco.com Mon Aug 12 11:23:44 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 328E221F8790 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 11:23:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.543 X-Spam-Level: X-Spam-Status: No, score=-10.543 tagged_above=-999 required=5 tests=[AWL=0.055, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OMLMw3FaGf0B for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 11:23:34 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id 47F4D21F8493 for <6tsch@ietf.org>; Mon, 12 Aug 2013 11:23:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=9078; q=dns/txt; s=iport; t=1376331814; x=1377541414; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=fRYViSXuj3YR+X/v5Dig9qYSBl+LYAh7JvHxt1bUa/k=; b=LYoq5pf5wI+5dpPYFAGBqjrHJlRj/e8rxe8WyQw7IUdQnwA1XkDsQyEC jD38jizk6kPSFbOplmC+mTs0ZuqmkYSRiYBAjfuwf4nfHjSn1l15L/hiA jfOx9u83zWbMuIsZ9v4Nb5HZ5i+blUG6DDVy3kGujb6XuuRS0GF9Iluvv w=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgsFACUnCVKtJXG+/2dsb2JhbABbDoI0RDVQvlaBGxZ0giUBAQQBAQEqQRsCAQgSEB0HJwsUAw4CBAESCIgIDLZNBJAKLQoBgxt2A4VHo26CXT6CKg X-IronPort-AV: E=Sophos;i="4.89,863,1367971200"; d="scan'208,217";a="246361604" Received: from rcdn-core2-3.cisco.com ([173.37.113.190]) by rcdn-iport-2.cisco.com with ESMTP; 12 Aug 2013 18:23:32 +0000 Received: from xhc-rcd-x13.cisco.com (xhc-rcd-x13.cisco.com [173.37.183.87]) by rcdn-core2-3.cisco.com (8.14.5/8.14.5) with ESMTP id r7CINWWM015872 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 12 Aug 2013 18:23:32 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.107]) by xhc-rcd-x13.cisco.com ([173.37.183.87]) with mapi id 14.02.0318.004; Mon, 12 Aug 2013 13:23:31 -0500 From: "Pascal Thubert (pthubert)" To: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOl36idF4NGU1oNkW6KVGqJ7fL45mR0Xxg Date: Mon, 12 Aug 2013 18:23:31 +0000 Deferred-Delivery: Mon, 12 Aug 2013 17:27:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.80.229] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD8413E5854xmbrcdx01ciscoc_" MIME-Version: 1.0 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 18:23:44 -0000 --_000_E045AECD98228444A58C61C200AE1BD8413E5854xmbrcdx01ciscoc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD8413E5854xmbrcdx01ciscoc_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Hello Xavi:

     

     

    Please see in= line

     <= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

        -this includes how OF is calculat= ed using numTx and numTxACK, etc..

     

    []

    -RPL configuration:

         - storing mode vs non-stori= ng mode (I vote for non-storing mode for a basic configuration)<= /p>

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     <= /p>

         - DIO period. Whether we us= e trickle algorithm (and we define the initial period) or we use a fix peri= od for DIO (no trickle) for basic configuration.

       &nb= sp;  -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= o:p>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_E045AECD98228444A58C61C200AE1BD8413E5854xmbrcdx01ciscoc_-- From xvilajosana@berkeley.edu Mon Aug 12 11:38:08 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 72EC921F9EE1 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 11:38:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[AWL=0.278, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sRkVF6yOr1tL for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 11:38:04 -0700 (PDT) Received: from mail-pa0-f51.google.com (mail-pa0-f51.google.com [209.85.220.51]) by ietfa.amsl.com (Postfix) with ESMTP id 5634E21F9EEB for <6tsch@ietf.org>; Mon, 12 Aug 2013 11:37:47 -0700 (PDT) Received: by mail-pa0-f51.google.com with SMTP id lf1so5038491pab.24 for <6tsch@ietf.org>; Mon, 12 Aug 2013 11:37:46 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=VnIcEs6yZ3GOOwwWm5zbd2rgtZp0a1Cjt9Ccjv2dBMs=; b=nZ+Ld8T5DQLJ+3il3psCrNLVuqciYS5oEtPjXly+COIPvycHcvjiD+0o37KK10USr5 ZVqgFJsA70+1h79MsofMJ26sCkh5Mpi2+sX49Onu/cN5Y5uB1MVf9p5CqDNhAIR+pdbV AM5gGkB0htKcXyAFOn0b0DR4EkvHM2WuxJHO+Wi7l0agwrGGJjAK0GDTbsavM57t/04N kn5H/WmSQ+YveQbG1iG9XfpGudS/jh3Kcslqr+6qYp4M/UCLtgegkDPOBD7fuC1ZGAjP ZTzU1ktlEcKlDgfSZZ6qj0B6f+7iDqdMG3K1vqgbPiKuk6NdZp9Mgxq+p60NQSIGVjVX 6GVA== X-Gm-Message-State: ALoCoQmJKaQBzQQ1G/5d009vh1JKNe5dPF6rin6RN+1r0JA0OMBf0e5ywttnOuvGv+3+qV5wHuG2 MIME-Version: 1.0 X-Received: by 10.68.36.132 with SMTP id q4mr417262pbj.118.1376332666569; Mon, 12 Aug 2013 11:37:46 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Mon, 12 Aug 2013 11:37:46 -0700 (PDT) In-Reply-To: References: Date: Mon, 12 Aug 2013 11:37:46 -0700 Message-ID: From: Xavier Vilajosana Guillen To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=bcaec5216259af16a304e3c46b77 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 18:38:08 -0000 --bcaec5216259af16a304e3c46b77 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pascal, *[] *We need to discuss NUD as well. How do we know a peer is gone missing? Only reactive to traffic has issues like a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Hello Xavi:**** > > ** ** > > ** ** > > Please see inline**** > > ** ** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > ** ** > > *[] * > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > ** ** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > ** ** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > ** ** > > Cheers;**** > > ** ** > > Pascal**** > > ** ** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --bcaec5216259af16a304e3c46b77 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pascal,

    [] We need to discuss NUD as well. How do we know a peer is gone missing?=20 Only reactive to traffic has issues like a child may never realize a=20 parent is gone if there is no outwards traffic so it will fail to update DAO states. How can=20 MAC mechanisms help?

    Keep alive packets help on that. := -)
    X


    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pt= hubert@cisco.com> wrote:

    Hello Xavi:

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --bcaec5216259af16a304e3c46b77-- From pthubert@cisco.com Mon Aug 12 11:47:05 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B072311E80D7 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 11:47:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.546 X-Spam-Level: X-Spam-Status: No, score=-10.546 tagged_above=-999 required=5 tests=[AWL=0.052, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r8Gybaen1rP3 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 11:46:59 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id C2D8021F9E34 for <6tsch@ietf.org>; Mon, 12 Aug 2013 11:46:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=15729; q=dns/txt; s=iport; t=1376333218; x=1377542818; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=Pxue+l1s7N0zBtpAtDVSs05wtV1Lq1YSXPFTMrrrR/k=; b=PJJE5JGnphuU/4XVFlLmuun/F3U3le3ZHH6OQJ/E9WXmfPVUd5eM6Vik VtVNaEukCqVLdAdAeTO9ZYCfDYIp0wRaLg3vydxnThfSxBSH5TyB9Mq0j O5H6puclRXiOm67nEEe32ac0LaIh8qRnOALdznFd2oAB+UEwKJKu0FUcw M=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AoEGAAItCVKtJXHB/2dsb2JhbABbDoI0RDVQvlaBGxZtB4IkAQEBBAEBASpBCxACAQgRAQMBAQsdBycLFAMGCAIEDgUIiAgMtl8Ejm+BGy0EBgGDG3YDhUeDLqBAgl0+gio X-IronPort-AV: E=Sophos;i="4.89,863,1367971200"; d="scan'208,217";a="246372398" Received: from rcdn-core2-6.cisco.com ([173.37.113.193]) by rcdn-iport-2.cisco.com with ESMTP; 12 Aug 2013 18:46:52 +0000 Received: from xhc-rcd-x06.cisco.com (xhc-rcd-x06.cisco.com [173.37.183.80]) by rcdn-core2-6.cisco.com (8.14.5/8.14.5) with ESMTP id r7CIkp5H014879 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 12 Aug 2013 18:46:51 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.107]) by xhc-rcd-x06.cisco.com ([173.37.183.80]) with mapi id 14.02.0318.004; Mon, 12 Aug 2013 13:46:51 -0500 From: "Pascal Thubert (pthubert)" To: "xvilajosana@eecs.berkeley.edu" Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOl4sLeYRffFFoHE+jd88ompQmTJmR56Kw Date: Mon, 12 Aug 2013 18:46:51 +0000 Deferred-Delivery: Mon, 12 Aug 2013 18:46:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.80.229] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD8413E58F0xmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 18:47:05 -0000 --_000_E045AECD98228444A58C61C200AE1BD8413E58F0xmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD8413E58F0xmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hello Xavi:

     <= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery dra= in. Question is what is the optimal way with TSCH for a child to find that the parent is gone, in the absence of traffic?

    Knowing that we’ll = have (or not) EBs, and that we will (or not) time sync from the RPL parent,= there is probably something we can recommend, and limitations to the granularity that we get.

     <= /p>

    Cheers,=

     <= /p>

    Pascal

     <= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation using Neighbors information de= scribed in Basic configuration.

        -this includes how OF is calculated using numTx= and numTxACK, etc..

     

    []

    -RPL configuration:

         - storing mode vs non-storing mode (I vot= e for non-storing mode for a basic configuration)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_E045AECD98228444A58C61C200AE1BD8413E58F0xmbrcdx01ciscoc_-- From rsudhaak@cisco.com Mon Aug 12 12:40:05 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 618B321F9F9D for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 12:40:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YqbU-s4Noan2 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 12:40:00 -0700 (PDT) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id 4A8BC21F9F44 for <6tsch@ietf.org>; Mon, 12 Aug 2013 12:40:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=9003; q=dns/txt; s=iport; t=1376336400; x=1377546000; h=from:to:cc:subject:date:message-id:in-reply-to: mime-version; bh=VxOj5K0qqZxg+apcbw2g55FPlUbjKcYkoz2KgZAT4cg=; b=PZh6I++pSfQhzlKl5wQRHwRzPh3VTkVY2NkFPfEkmuAQHT3xkijviuKR v0nJUCaW2lg0W6uIN0tfbjRK2GB4mMf4/yieZkLrOqQ6wR/lXV738T71z MeEsSlXjGhepJ38tKeV/jMopXwyZKOS5k37pkwceYJIfwxdl2mTz6aYLR w=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgsFAHU5CVKtJXHA/2dsb2JhbABbDoI0RDVQvlaBGxZ0giQBAQEEAQEBawQHEgEIEQMBAgsdLgsUCQgCBAENBQiICAy2XQSQCiANBAcGgxV2A6k1gl0+gio X-IronPort-AV: E=Sophos;i="4.89,863,1367971200"; d="scan'208,217";a="246229738" Received: from rcdn-core2-5.cisco.com ([173.37.113.192]) by rcdn-iport-1.cisco.com with ESMTP; 12 Aug 2013 19:39:49 +0000 Received: from xhc-rcd-x01.cisco.com (xhc-rcd-x01.cisco.com [173.37.183.75]) by rcdn-core2-5.cisco.com (8.14.5/8.14.5) with ESMTP id r7CJdnQb026185 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 12 Aug 2013 19:39:49 GMT Received: from xmb-rcd-x04.cisco.com ([169.254.8.99]) by xhc-rcd-x01.cisco.com ([173.37.183.75]) with mapi id 14.02.0318.004; Mon, 12 Aug 2013 14:39:49 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: "xvilajosana@eecs.berkeley.edu" , Qin Wang Thread-Topic: [6tsch] about format Thread-Index: AQHOl5O0VFMfU5uj3UagrCHQncSqZg== Date: Mon, 12 Aug 2013 19:39:48 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958D@xmb-rcd-x04.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.154.204.188] Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958Dxmbrcdx04ciscoc_" MIME-Version: 1.0 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 19:40:05 -0000 --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958Dxmbrcdx04ciscoc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Qin, There is an advantage of using BSON over regular JSON for the purpose of tr= ansporting schedule information. Most of this info is bitmaps, and BSON cap= ability to handle binary payload will be efficient compared to regular JSON= . If we define the formats as regular BSON as opposed to custom formats, th= e implementation of 6top in various languages will also be easier as BSON l= ibraries are readily available. From: Xavier Vilajosana Guillen > Reply-To: > Date: Monday, August 12, 2013 11:02 AM To: Qin Wang > Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] about format Hi Qin, I think that the work item aims to define the packet format of the messages= that will transport the schedule information, this is on top of 6top. 6top= has the API to handle that information and use its own messages (using its= IEs) to install the schedule in both sides of a link (if there is connecti= vity between the two nodes). X On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang > wrote: Xavi, It make more sense to use BSON in higher layer message definition. But if so, why it should be included in the document "Timeslot management m= ethods and format" ? My understanding is the document is about 6top, so the= format in the document refers to the format of 6top packets. Please point = out where I'm wrong. Thanks Qin On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosana Guillen > wrote: Hi Qin, my feeling is that BSON will go in the packet from the PCE to the mote that= has to be scheduled. This is a higher layer issue and relates to the paylo= ad of a CoAP packet sent from the PCE to the mote (and viceversa). I don't = think that 6top needs BSON as an encoding for the IEs. does it make sense? X On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang > wrote: Hi Pascal, During the teleconference on last Friday, you mentioned that we will invest= igate Binary JSON to define the message formats. I'm not very clear about w= hat is the relationship between the Binary JSON coding and 802.15.4e Inform= ation Element. I guess that we will still use IEs to carry the 6top message= s, but for those IE coding, we will use Binary JSON. Correct? By the way, what is the advantage to use Binary JSON format? What are your = main considerations? Thanks Qin _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958Dxmbrcdx04ciscoc_ Content-Type: text/html; charset="us-ascii" Content-ID: <5CF26BD24AF50045BDB91D5F2717C4A2@emea.cisco.com> Content-Transfer-Encoding: quoted-printable
    Qin,
    There is an advantage of using BSON over regular JSON for the purpose = of transporting schedule information. Most of this info is bitmaps, and BSO= N capability to handle binary payload will be efficient compared to regular= JSON. If we define the formats as regular BSON as opposed to custom formats, the implementation of 6top i= n various languages will also be easier as BSON libraries are readily avail= able.

    From: Xavier Vilajosana Guillen <= ;xvilajosana@eecs.berkeley= .edu>
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Monday, August 12, 2013 11:02= AM
    To: Qin Wang <qinwang@berkeley.edu>
    Cc: "6tsch@ietf.org" <6ts= ch@ietf.org>
    Subject: Re: [6tsch] about format

    Hi Qin,

    I think that the work item aims to define the packet format of the messages= that will transport the schedule information, this is on top of 6top. 6top= has the API to handle that information and use its own messages (using its= IEs) to install the schedule in both sides of a link (if there is connectivity between the two nodes).

    X


    On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang <qinwang@berke= ley.edu> wrote:
    Xavi,

    It make more sense to use BSON in higher layer message definition.&nbs= p;

    But if so, why it should be included in the document "Timeslot ma= nagement methods and format" ? My understanding is the document is abo= ut 6top, so the format in the document refers to the format of 6top packets= . Please point out where I'm wrong.

    Thanks
    Qin


    On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Qin,

    my feeling is that BSON will go in the packet from the PCE to the mote that= has to be scheduled. This is a higher layer issue and relates to the paylo= ad of a CoAP packet sent from the PCE to the mote (and viceversa). I don't = think that 6top needs BSON as an encoding for the IEs.

    does it make sense?
    X


    On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Pascal,

    During the teleconference on last Friday, you mentioned that we will i= nvestigate Binary JSON to define the message formats. I'm not very clear ab= out what is the relationship between the Binary JSON coding and 802.15.4e I= nformation Element. I guess that we will still use IEs to carry the 6top messages, but for those IE coding,= we will use Binary JSON. Correct?

    By the way, what is the advantage to use Binary JSON format? What are = your main considerations?

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch




     --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958Dxmbrcdx04ciscoc_-- From qinwang@berkeley.edu Mon Aug 12 14:24:15 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C6DEF21F963F for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 14:23:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.856 X-Spam-Level: X-Spam-Status: No, score=-2.856 tagged_above=-999 required=5 tests=[AWL=0.120, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4iyt7WeJynI5 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 14:23:49 -0700 (PDT) Received: from mail-vc0-f174.google.com (mail-vc0-f174.google.com [209.85.220.174]) by ietfa.amsl.com (Postfix) with ESMTP id 3987E21F994B for <6tsch@ietf.org>; Mon, 12 Aug 2013 14:23:44 -0700 (PDT) Received: by mail-vc0-f174.google.com with SMTP id gd11so3236897vcb.19 for <6tsch@ietf.org>; Mon, 12 Aug 2013 14:23:42 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=KU21yH3FL07AbnU6AGCzTWlbLtZntz9HsWBDJy7a2Nk=; b=EpZ1jkh1cBB1eDFn8FZwCTyp9CHJJ1zmBsB6pWUb9eFAm1Uj4il+S9l2O8+KG6OAOG wPuaMvozs+imYiBJ11VjLwzYn10J9eeVj/vgnEksxsoxjtFIIUFyvCeJWhB7qOrDUTKY LgADGKCUnsZ6+FHALMDkQW8PyJagPgoEzQEJY4MRhTDilliWq9DydoPuDaoc0yqkcaEe VMrym0IYqfZGS1VrVeIWsXK4gOEFlI22fSGtl977J05gpTGfmY3qXCU5sZMpvg6TPuhX 4DLv8lC9WDxMLZLgzyt3rKuBxms1C+RW3fjvV3zTxLVj8D7UujTJrMZMUA/dUClQDeSO Gziw== X-Gm-Message-State: ALoCoQkOL26Z7PbvSxLv7sr6O9wzxyYGrhN9aOiTTH4NbnjpUBG4j6SeeCfjaKAvQSdwQV8G4I7Z MIME-Version: 1.0 X-Received: by 10.52.187.162 with SMTP id ft2mr710141vdc.10.1376342622565; Mon, 12 Aug 2013 14:23:42 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Mon, 12 Aug 2013 14:23:42 -0700 (PDT) In-Reply-To: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958D@xmb-rcd-x04.cisco.com> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958D@xmb-rcd-x04.cisco.com> Date: Tue, 13 Aug 2013 05:23:42 +0800 Message-ID: From: Qin Wang To: "Raghuram Sudhaakar (rsudhaak)" Content-Type: multipart/alternative; boundary=bcaec548a7af1b848a04e3c6bd51 Cc: "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 21:24:16 -0000 --bcaec548a7af1b848a04e3c6bd51 Content-Type: text/plain; charset=ISO-8859-1 Hi Xavi and Raghuram, Now I can see the advantage of BSON. Regarding to the scope of "Timeslot Management Methods and Formats", and the relationship between task item-1 and item-2, now my understanding is as follows. (1) item-2 is about 6top. In the first step, it is a subset of 6top, only includes the commands and packets/IEs used for static case, i.e. Enhanced Beacon based schedule establishment. It still use custom format and 15.4e IE to carry. (2) item-1 is about the management messages carried by upper layer protocols like CoAP to use 6top. It is still a open issue to use BSON or custom format to define the management messages. Correct? Thanks Qin On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) < rsudhaak@cisco.com> wrote: > Qin, > There is an advantage of using BSON over regular JSON for the purpose of > transporting schedule information. Most of this info is bitmaps, and BSON > capability to handle binary payload will be efficient compared to regular > JSON. If we define the formats as regular BSON as opposed to custom > formats, the implementation of 6top in various languages will also be > easier as BSON libraries are readily available. > > From: Xavier Vilajosana Guillen > Reply-To: > Date: Monday, August 12, 2013 11:02 AM > To: Qin Wang > Cc: "6tsch@ietf.org" <6tsch@ietf.org> > Subject: Re: [6tsch] about format > > Hi Qin, > > I think that the work item aims to define the packet format of the > messages that will transport the schedule information, this is on top of > 6top. 6top has the API to handle that information and use its own messages > (using its IEs) to install the schedule in both sides of a link (if there > is connectivity between the two nodes). > > X > > > On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang wrote: > >> Xavi, >> >> It make more sense to use BSON in higher layer message definition. >> >> But if so, why it should be included in the document "Timeslot >> management methods and format" ? My understanding is the document is about >> 6top, so the format in the document refers to the format of 6top packets. >> Please point out where I'm wrong. >> >> Thanks >> Qin >> >> >> On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote: >> >>> Hi Qin, >>> >>> my feeling is that BSON will go in the packet from the PCE to the mote >>> that has to be scheduled. This is a higher layer issue and relates to the >>> payload of a CoAP packet sent from the PCE to the mote (and viceversa). I >>> don't think that 6top needs BSON as an encoding for the IEs. >>> >>> does it make sense? >>> X >>> >>> >>> On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang wrote: >>> >>>> Hi Pascal, >>>> >>>> During the teleconference on last Friday, you mentioned that we will >>>> investigate Binary JSON to define the message formats. I'm not very clear >>>> about what is the relationship between the Binary JSON coding and 802.15.4e >>>> Information Element. I guess that we will still use IEs to carry the 6top >>>> messages, but for those IE coding, we will use Binary JSON. Correct? >>>> >>>> By the way, what is the advantage to use Binary JSON format? What are >>>> your main considerations? >>>> >>>> Thanks >>>> Qin >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>>> >>> >> > --bcaec548a7af1b848a04e3c6bd51 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Xavi and Raghuram,

    Now I can see the= advantage of BSON.

    Regarding to the scope of=A0&q= uot;Timeslot Management Methods and Formats", and the relationship bet= ween task item-1 and item-2, now my understanding is as follows.

    (1) item-2 is about 6top. In the first step, it is a su= bset of 6top, only includes the commands and packets/IEs used for static ca= se, i.e. Enhanced Beacon based schedule establishment. It still use custom = format and 15.4e IE to carry.

    (2) item-1 is about the management messages carried by = upper layer protocols like CoAP to use 6top. It is still a open issue to us= e BSON or custom format to define the management messages.

    Correct?

    Thanks
    Qin








    On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@= cisco.com> wrote:
    Qin,
    There is an advantage of using BSON over regular JSON for the purpose = of transporting schedule information. Most of this info is bitmaps, and BSO= N capability to handle binary payload will be efficient compared to regular= JSON. If we define the formats as regular BSON as opposed to custom formats, the implementation of 6top i= n various languages will also be easier as BSON libraries are readily avail= able.

    From: Xavier Vilajosana Guillen <= ;xvilajo= sana@eecs.berkeley.edu>
    Reply-To: <xvilajosana@eecs.berkeley.edu= >
    Date: Monday, August 12, 2013 11:02= AM
    To: Qin Wang <qinwang@berkeley.edu>
    Cc: "6tsch@ietf.org" <6tsch@ietf.org>
    Subject: Re: [6tsch] about format

    Hi Qin,

    I think that the work item aims to define the packet format of the messages= that will transport the schedule information, this is on top of 6top. 6top= has the API to handle that information and use its own messages (using its= IEs) to install the schedule in both sides of a link (if there is connectivity between the two nodes).

    X


    On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang <qinwang@berke= ley.edu> wrote:
    Xavi,

    It make more sense to use BSON in higher layer message definition.=A0<= /div>

    But if so, why it should be included in the document "Timeslot ma= nagement methods and format" ? My understanding is the document is abo= ut 6top, so the format in the document refers to the format of 6top packets= . Please point out where I'm wrong.

    Thanks
    Qin


    On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Qin,

    my feeling is that BSON will go in the packet from the PCE to the mote that= has to be scheduled. This is a higher layer issue and relates to the paylo= ad of a CoAP packet sent from the PCE to the mote (and viceversa). I don= 9;t think that 6top needs BSON as an encoding for the IEs.

    does it make sense?
    X


    On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Pascal,

    During the teleconference on last Friday, you mentioned that we will i= nvestigate Binary JSON to define the message formats. I'm not very clea= r about what is the relationship between the Binary JSON coding and 802.15.= 4e Information Element. I guess that we will still use IEs to carry the 6top messages, but for those IE coding,= we will use Binary JSON. Correct?

    By the way, what is the advantage to use Binary JSON format? What are = your main considerations?

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    --bcaec548a7af1b848a04e3c6bd51-- From xvilajosana@berkeley.edu Mon Aug 12 14:38:44 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D6DD521F8FD8 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 14:38:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.726 X-Spam-Level: X-Spam-Status: No, score=-2.726 tagged_above=-999 required=5 tests=[AWL=0.250, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id C14V7t8wQfdD for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 14:38:39 -0700 (PDT) Received: from mail-pa0-f45.google.com (mail-pa0-f45.google.com [209.85.220.45]) by ietfa.amsl.com (Postfix) with ESMTP id 91BE721F8F63 for <6tsch@ietf.org>; Mon, 12 Aug 2013 14:38:39 -0700 (PDT) Received: by mail-pa0-f45.google.com with SMTP id bg4so8009640pad.18 for <6tsch@ietf.org>; Mon, 12 Aug 2013 14:38:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=qOFG+8oSnGqyfkdtdoom1x9322nViCNEFfzZ8oeTizs=; b=FfcE7xL3OxYoj/au2abSvLQeyNM8AeD6isyw/t9T5D4JBiIPdub+nmkpV0AG62dmAk oxgynE243CS5LGU+fKg+HYPon3vD7t3mNHpEPU1vveoCD2+WUVRNW0iBypdJYqUgfKsp U5BefQkgOXTNdwNr/EhaES1MAV4ESJ3C20Km16WFu/2K1IMUbw4/rPORe3eBWnCskbsi WRHQasLerMcVp+69wZNyG5FpkEILFLJsYCIqxLas2kObYv+N92KENc0LzSSUT7fuh57C xI8Qz2sat7Dhcxzb6odAsCZMr1NkoVXK7xTBva0GVeVIbK4CsmKHf36EkTDNoJNcs+QY 8dSg== X-Gm-Message-State: ALoCoQnoWLBeFJ4GfQDOJcDfzV7mJvrAFc5Gy7aXNoNW1e5GrHaH20TMof9ipnknu1TpZVJCigJH MIME-Version: 1.0 X-Received: by 10.67.8.98 with SMTP id dj2mr1055665pad.47.1376343519095; Mon, 12 Aug 2013 14:38:39 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Mon, 12 Aug 2013 14:38:39 -0700 (PDT) In-Reply-To: References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958D@xmb-rcd-x04.cisco.com> Date: Mon, 12 Aug 2013 14:38:39 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=089e0158bbc68b770a04e3c6f262 Cc: "Raghuram Sudhaakar \(rsudhaak\)" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 21:38:44 -0000 --089e0158bbc68b770a04e3c6f262 Content-Type: text/plain; charset=ISO-8859-1 Hi Qin, this sounds correct to me. X On Mon, Aug 12, 2013 at 2:23 PM, Qin Wang wrote: > Hi Xavi and Raghuram, > > Now I can see the advantage of BSON. > > Regarding to the scope of "Timeslot Management Methods and Formats", and > the relationship between task item-1 and item-2, now my understanding is as > follows. > > (1) item-2 is about 6top. In the first step, it is a subset of 6top, only > includes the commands and packets/IEs used for static case, i.e. Enhanced > Beacon based schedule establishment. It still use custom format and 15.4e > IE to carry. > > (2) item-1 is about the management messages carried by upper layer > protocols like CoAP to use 6top. It is still a open issue to use BSON or > custom format to define the management messages. > > Correct? > > Thanks > Qin > > > > > > > > > On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote: > >> Qin, >> There is an advantage of using BSON over regular JSON for the purpose of >> transporting schedule information. Most of this info is bitmaps, and BSON >> capability to handle binary payload will be efficient compared to regular >> JSON. If we define the formats as regular BSON as opposed to custom >> formats, the implementation of 6top in various languages will also be >> easier as BSON libraries are readily available. >> >> From: Xavier Vilajosana Guillen >> Reply-To: >> Date: Monday, August 12, 2013 11:02 AM >> To: Qin Wang >> Cc: "6tsch@ietf.org" <6tsch@ietf.org> >> Subject: Re: [6tsch] about format >> >> Hi Qin, >> >> I think that the work item aims to define the packet format of the >> messages that will transport the schedule information, this is on top of >> 6top. 6top has the API to handle that information and use its own messages >> (using its IEs) to install the schedule in both sides of a link (if there >> is connectivity between the two nodes). >> >> X >> >> >> On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang wrote: >> >>> Xavi, >>> >>> It make more sense to use BSON in higher layer message definition. >>> >>> But if so, why it should be included in the document "Timeslot >>> management methods and format" ? My understanding is the document is about >>> 6top, so the format in the document refers to the format of 6top packets. >>> Please point out where I'm wrong. >>> >>> Thanks >>> Qin >>> >>> >>> On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosana Guillen < >>> xvilajosana@eecs.berkeley.edu> wrote: >>> >>>> Hi Qin, >>>> >>>> my feeling is that BSON will go in the packet from the PCE to the mote >>>> that has to be scheduled. This is a higher layer issue and relates to the >>>> payload of a CoAP packet sent from the PCE to the mote (and viceversa). I >>>> don't think that 6top needs BSON as an encoding for the IEs. >>>> >>>> does it make sense? >>>> X >>>> >>>> >>>> On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang wrote: >>>> >>>>> Hi Pascal, >>>>> >>>>> During the teleconference on last Friday, you mentioned that we will >>>>> investigate Binary JSON to define the message formats. I'm not very clear >>>>> about what is the relationship between the Binary JSON coding and 802.15.4e >>>>> Information Element. I guess that we will still use IEs to carry the 6top >>>>> messages, but for those IE coding, we will use Binary JSON. Correct? >>>>> >>>>> By the way, what is the advantage to use Binary JSON format? What >>>>> are your main considerations? >>>>> >>>>> Thanks >>>>> Qin >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>>> >>>> >>> >> > --089e0158bbc68b770a04e3c6f262 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Qin,

    this sounds correct to me.
    X<= br>


    On M= on, Aug 12, 2013 at 2:23 PM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Xavi and Raghuram,
    <= br>
    Now I can see the advantage of BSON.

    Regarding to the scope of=A0"Timeslot Management Methods and Formats&= quot;, and the relationship between task item-1 and item-2, now my understa= nding is as follows.

    (1) item-2 is about 6top. In the first step, it is a su= bset of 6top, only includes the commands and packets/IEs used for static ca= se, i.e. Enhanced Beacon based schedule establishment. It still use custom = format and 15.4e IE to carry.

    (2) item-1 is about the management messages carried by = upper layer protocols like CoAP to use 6top. It is still a open issue to us= e BSON or custom format to define the management messages.

    Correct?

    Thanks
    Qin








    =
    On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@= cisco.com> wrote:
    Qin,
    There is an advantage of using BSON over regular JSON for the purpose = of transporting schedule information. Most of this info is bitmaps, and BSO= N capability to handle binary payload will be efficient compared to regular= JSON. If we define the formats as regular BSON as opposed to custom formats, the implementation of 6top i= n various languages will also be easier as BSON libraries are readily avail= able.

    From: Xavier Vilajosana Guillen <= ;xvilajo= sana@eecs.berkeley.edu>
    Reply-To: <xvilajosana@eecs.berkeley.edu= >
    Date: Monday, August 12, 2013 11:02= AM
    To: Qin Wang <qinwang@berkeley.edu>
    Cc: "6tsch@ietf.org" <6tsch@ietf.org>
    Subject: Re: [6tsch] about format

    Hi Qin,

    I think that the work item aims to define the packet format of the messages= that will transport the schedule information, this is on top of 6top. 6top= has the API to handle that information and use its own messages (using its= IEs) to install the schedule in both sides of a link (if there is connectivity between the two nodes).

    X


    On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang <qinwang@berke= ley.edu> wrote:
    Xavi,

    It make more sense to use BSON in higher layer message definition.=A0<= /div>

    But if so, why it should be included in the document "Timeslot ma= nagement methods and format" ? My understanding is the document is abo= ut 6top, so the format in the document refers to the format of 6top packets= . Please point out where I'm wrong.

    Thanks
    Qin


    On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Qin,

    my feeling is that BSON will go in the packet from the PCE to the mote that= has to be scheduled. This is a higher layer issue and relates to the paylo= ad of a CoAP packet sent from the PCE to the mote (and viceversa). I don= 9;t think that 6top needs BSON as an encoding for the IEs.

    does it make sense?
    X


    On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Pascal,

    During the teleconference on last Friday, you mentioned that we will i= nvestigate Binary JSON to define the message formats. I'm not very clea= r about what is the relationship between the Binary JSON coding and 802.15.= 4e Information Element. I guess that we will still use IEs to carry the 6top messages, but for those IE coding,= we will use Binary JSON. Correct?

    By the way, what is the advantage to use Binary JSON format? What are = your main considerations?

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --089e0158bbc68b770a04e3c6f262-- From twatteyne@gmail.com Mon Aug 12 23:59:38 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1297111E8145 for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 23:59:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 05vkQSwMEdbT for <6tsch@ietfa.amsl.com>; Mon, 12 Aug 2013 23:59:37 -0700 (PDT) Received: from mail-pb0-x230.google.com (mail-pb0-x230.google.com [IPv6:2607:f8b0:400e:c01::230]) by ietfa.amsl.com (Postfix) with ESMTP id 4760A11E8118 for <6tsch@ietf.org>; Mon, 12 Aug 2013 23:59:34 -0700 (PDT) Received: by mail-pb0-f48.google.com with SMTP id ma3so7570385pbc.7 for <6tsch@ietf.org>; Mon, 12 Aug 2013 23:59:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=/Qb2MmR0vRgEx1RSRZ1fmiqE0X3M1OP6O9hMewf9vSI=; b=bqA0gQVawcVexXfrdRjAXnRYPoHnM8gG7Put3b82DTSE2aVs0EuXWqq0o0+2RsJVOd 3v4YTUJwM8o6eoFikIyrKfbQSsO+6LAMYh6EApyyGYWwr9QK2ll3FH6P+gea1wrB+Gim 4XHysg3leoGhO3FVw6I4WTNu5dP9l8lK++4rSzjwk8x5AVsqq9TjqV8I+zhll8CQG3g9 c2++8xlxttOe36NxlEyCQBhUXZs8sJuMv1GAITqKrZgkVgsssHn+RIrcfWbwkcYal2v3 Caucm2pYZTfhsQbrkDBsbX1MxT+eFf8YjoPND1WD2M3aI8SonFaNcubXGKDYZ8p0f7OV fXQQ== X-Received: by 10.66.123.5 with SMTP id lw5mr2926763pab.83.1376377173923; Mon, 12 Aug 2013 23:59:33 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Mon, 12 Aug 2013 23:59:13 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Mon, 12 Aug 2013 23:59:13 -0700 X-Google-Sender-Auth: lCmfSes_vhGsnrFm7KSBQpnu714 Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7bf0e7c8875dbb04e3cec894 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 06:59:38 -0000 --047d7bf0e7c8875dbb04e3cec894 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable We established a while ago that we could reuse the RPL DAG structure for timekeeping. That is, a node's routing parent coincides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized with its RPL parent. In the absence of traffic, the node will periodically "keep alive" (per Xavi's e-mail) to the parent. How often depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routing parent is missing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent case. Of course, this alone does no cover parent->child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Hello Xavi:**** > > ** ** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > ** ** > > Cheers,**** > > ** ** > > Pascal**** > > ** ** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > ** ** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --047d7bf0e7c8875dbb04e3cec894 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable --047d7bf0e7c8875dbb04e3cec894-- From twatteyne@gmail.com Tue Aug 13 00:04:09 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EB51411E8118 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 00:04:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yiPWSIxADYt5 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 00:04:06 -0700 (PDT) Received: from mail-pa0-x22f.google.com (mail-pa0-x22f.google.com [IPv6:2607:f8b0:400e:c03::22f]) by ietfa.amsl.com (Postfix) with ESMTP id 149E211E8143 for <6tsch@ietf.org>; Tue, 13 Aug 2013 00:04:05 -0700 (PDT) Received: by mail-pa0-f47.google.com with SMTP id kl13so8524060pab.34 for <6tsch@ietf.org>; Tue, 13 Aug 2013 00:04:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=keZmY2cG1Y6f/1yEsgmA9VGlZtHwU31nDOuVtkhPxxg=; b=Ga/Hh1ulng1fPVmwyX1FscSCWE6mxc/SftGx3ODgQ+6UHKF7ENsy6ss0+LpoIy5unb xVYfYYzry3jsLbAhRvvAhLuoaWm+ZojC4HgRikVJ1Jjt3BQ9OXJECGQNOBq297AlLWdK a76HHhNYcLCtkb6GWwsM1KMp+pS84dKrITB3ykxmtSm4USoTw235CieK5YZGtQJoJt/p gyPSTywjyBH3nPiltSsIaL8X00oyEki7vqLNX97eW3Gw6NEW8LtTYzxwtgz9IzhR+JFq GGJieYZM4w3+UhSB8aoJH0+av9O4Vk3XBAq0WHChRweBzQE87wod2ICXlCtP5Sh0Oyt9 wOpQ== X-Received: by 10.66.74.65 with SMTP id r1mr2955577pav.81.1376377443080; Tue, 13 Aug 2013 00:04:03 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 13 Aug 2013 00:03:43 -0700 (PDT) In-Reply-To: References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958D@xmb-rcd-x04.cisco.com> From: Thomas Watteyne Date: Tue, 13 Aug 2013 00:03:43 -0700 X-Google-Sender-Auth: afTRjfkjAKtpcpgUVEmEvRJ--gc Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=f46d042f931e92616804e3ced827 Subject: Re: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 07:04:09 -0000 --f46d042f931e92616804e3ced827 Content-Type: text/plain; charset=ISO-8859-1 +1. Please note that the goal of item 1 is to define the format of the payload, not per se the transport method. Thomas On Mon, Aug 12, 2013 at 2:38 PM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi Qin, > > this sounds correct to me. > X > > > On Mon, Aug 12, 2013 at 2:23 PM, Qin Wang wrote: > >> Hi Xavi and Raghuram, >> >> Now I can see the advantage of BSON. >> >> Regarding to the scope of "Timeslot Management Methods and Formats", and >> the relationship between task item-1 and item-2, now my understanding is as >> follows. >> >> (1) item-2 is about 6top. In the first step, it is a subset of 6top, only >> includes the commands and packets/IEs used for static case, i.e. Enhanced >> Beacon based schedule establishment. It still use custom format and 15.4e >> IE to carry. >> >> (2) item-1 is about the management messages carried by upper layer >> protocols like CoAP to use 6top. It is still a open issue to use BSON or >> custom format to define the management messages. >> >> Correct? >> >> Thanks >> Qin >> >> >> >> >> >> >> >> >> On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) < >> rsudhaak@cisco.com> wrote: >> >>> Qin, >>> There is an advantage of using BSON over regular JSON for the purpose of >>> transporting schedule information. Most of this info is bitmaps, and BSON >>> capability to handle binary payload will be efficient compared to regular >>> JSON. If we define the formats as regular BSON as opposed to custom >>> formats, the implementation of 6top in various languages will also be >>> easier as BSON libraries are readily available. >>> >>> From: Xavier Vilajosana Guillen >>> Reply-To: >>> Date: Monday, August 12, 2013 11:02 AM >>> To: Qin Wang >>> Cc: "6tsch@ietf.org" <6tsch@ietf.org> >>> Subject: Re: [6tsch] about format >>> >>> Hi Qin, >>> >>> I think that the work item aims to define the packet format of the >>> messages that will transport the schedule information, this is on top of >>> 6top. 6top has the API to handle that information and use its own messages >>> (using its IEs) to install the schedule in both sides of a link (if there >>> is connectivity between the two nodes). >>> >>> X >>> >>> >>> On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang wrote: >>> >>>> Xavi, >>>> >>>> It make more sense to use BSON in higher layer message definition. >>>> >>>> But if so, why it should be included in the document "Timeslot >>>> management methods and format" ? My understanding is the document is about >>>> 6top, so the format in the document refers to the format of 6top packets. >>>> Please point out where I'm wrong. >>>> >>>> Thanks >>>> Qin >>>> >>>> >>>> On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosana Guillen < >>>> xvilajosana@eecs.berkeley.edu> wrote: >>>> >>>>> Hi Qin, >>>>> >>>>> my feeling is that BSON will go in the packet from the PCE to the >>>>> mote that has to be scheduled. This is a higher layer issue and relates to >>>>> the payload of a CoAP packet sent from the PCE to the mote (and viceversa). >>>>> I don't think that 6top needs BSON as an encoding for the IEs. >>>>> >>>>> does it make sense? >>>>> X >>>>> >>>>> >>>>> On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang wrote: >>>>> >>>>>> Hi Pascal, >>>>>> >>>>>> During the teleconference on last Friday, you mentioned that we >>>>>> will investigate Binary JSON to define the message formats. I'm not very >>>>>> clear about what is the relationship between the Binary JSON coding and >>>>>> 802.15.4e Information Element. I guess that we will still use IEs to carry >>>>>> the 6top messages, but for those IE coding, we will use Binary JSON. >>>>>> Correct? >>>>>> >>>>>> By the way, what is the advantage to use Binary JSON format? What >>>>>> are your main considerations? >>>>>> >>>>>> Thanks >>>>>> Qin >>>>>> >>>>>> _______________________________________________ >>>>>> 6tsch mailing list >>>>>> 6tsch@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>>> >>>>>> >>>>> >>>> >>> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --f46d042f931e92616804e3ced827 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    +1.

    Please note that the goal of item 1= is to define the format of the payload, not per se the transport method.

    Thomas
    =

    On Mon, Aug 12, 2013 at 2:38 PM, Xavier Vila= josana Guillen <xvilajosana@eecs.berkeley.edu> w= rote:
    Hi Qin,

    t= his sounds correct to me.X


    On Mon, Aug 12, 2013 at 2:23= PM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Xavi and Raghuram,
    <= br>
    Now I can see the advantage of BSON.

    Regarding to the scope of=A0"Timeslot Management Methods and Formats&q= uot;, and the relationship between task item-1 and item-2, now my understan= ding is as follows.

    (1) item-2 is about 6top. In the first step, it is a su= bset of 6top, only includes the commands and packets/IEs used for static ca= se, i.e. Enhanced Beacon based schedule establishment. It still use custom = format and 15.4e IE to carry.

    (2) item-1 is about the management messages carried by = upper layer protocols like CoAP to use 6top. It is still a open issue to us= e BSON or custom format to define the management messages.

    Correct?

    Thanks
    Qin








    On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@= cisco.com> wrote:
    Qin,
    There is an advantage of using BSON over regular JSON for the purpose = of transporting schedule information. Most of this info is bitmaps, and BSO= N capability to handle binary payload will be efficient compared to regular= JSON. If we define the formats as regular BSON as opposed to custom formats, the implementation of 6top i= n various languages will also be easier as BSON libraries are readily avail= able.

    From: Xavier Vilajosana Guillen <= ;xvilajo= sana@eecs.berkeley.edu>
    Reply-To: <xvilajosana@eecs.berkeley.edu= >
    Date: Monday, August 12, 2013 11:02= AM
    To: Qin Wang <qinwang@berkeley.edu>
    Cc: "6tsch@ietf.org" <6tsch@ietf.org>
    Subject: Re: [6tsch] about format

    Hi Qin,

    I think that the work item aims to define the packet format of the messages= that will transport the schedule information, this is on top of 6top. 6top= has the API to handle that information and use its own messages (using its= IEs) to install the schedule in both sides of a link (if there is connectivity between the two nodes).

    X


    On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang <qinwang@berke= ley.edu> wrote:
    Xavi,

    It make more sense to use BSON in higher layer message definition.=A0<= /div>

    But if so, why it should be included in the document "Timeslot ma= nagement methods and format" ? My understanding is the document is abo= ut 6top, so the format in the document refers to the format of 6top packets= . Please point out where I'm wrong.

    Thanks
    Qin


    On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Qin,

    my feeling is that BSON will go in the packet from the PCE to the mote that= has to be scheduled. This is a higher layer issue and relates to the paylo= ad of a CoAP packet sent from the PCE to the mote (and viceversa). I don= 9;t think that 6top needs BSON as an encoding for the IEs.

    does it make sense?
    X


    On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Pascal,

    During the teleconference on last Friday, you mentioned that we will i= nvestigate Binary JSON to define the message formats. I'm not very clea= r about what is the relationship between the Binary JSON coding and 802.15.= 4e Information Element. I guess that we will still use IEs to carry the 6top messages, but for those IE coding,= we will use Binary JSON. Correct?

    By the way, what is the advantage to use Binary JSON format? What are = your main considerations?

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    We established a while ago that we could reuse the RPL DAG= structure for timekeeping. That is, a node's routing parent coincides = with its TSCH time source neighbor. As a result, and as part of IEEE802.15.= 4e's normal operation, a node keeps synchronized with its RPL parent. I= n the absence of traffic, the node will periodically "keep alive"= (per Xavi's e-mail) to the parent. How often depends on a number of fa= ctors, including crystal drift and guard time, but in a typical case, a nod= e will realize its routing parent is missing after 30-60s.

    I believe this mechanism can serve for NUD, at least n the c= hild->parent case. Of course, this alone does no cover parent->child = or NUD between siblings. Any thoughts on the implications of limiting NUD t= o the child->parent case?

    On Mon, Aug 12, 2= 013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery dra= in. Question is what is the optimal way with TSCH for a child to find that the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity that we get.

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --f46d042f931e92616804e3ced827-- From qinwang@berkeley.edu Tue Aug 13 06:18:55 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F370B21E8132 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 06:18:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.976 X-Spam-Level: X-Spam-Status: No, score=-2.976 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JXN3IPk3Ne2f for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 06:18:50 -0700 (PDT) Received: from mail-vc0-f171.google.com (mail-vc0-f171.google.com [209.85.220.171]) by ietfa.amsl.com (Postfix) with ESMTP id 95F9521E8127 for <6tsch@ietf.org>; Tue, 13 Aug 2013 06:18:50 -0700 (PDT) Received: by mail-vc0-f171.google.com with SMTP id ij15so3838472vcb.30 for <6tsch@ietf.org>; Tue, 13 Aug 2013 06:18:50 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=nEScxr/wRfyKtP18FqH2GcHgcH8sl9F7vUs5I0MK/Jo=; b=AeE/1ekSNa0voA69ygMc7k/yexV6EMuuuPQN9nSuimaJ6cAGaRktc/S+nUmIz2jM38 ktS4z5oEMF2y9sx4DRgWbv8WXKFxdxo/uDgTxeMEE8tMJvNIPAEH1f+2+epiZXo8NX8C Ma/bzTpNu6uNoKQ3FxuxZZ9H7kvpGXUqgHcydMsYYR9S/L0zmK0QCq0TWWskfYq3LivZ zzSApNyilolNo7jgfi3ohCVcmPlXEF6NkPvZg3rXHuEjK82WHAGnLs+ZSNAFnc05TEZY whrlcg59icKvbeFVkxl18sV9MJCS43haj85AvmDB0zBn1KW9vLCMAmf8ujhis13xTOys 9+GQ== X-Gm-Message-State: ALoCoQmPf7i0LmdQY90nGLEhspOb9DxHEOMhTDuGzms/AhnGM1srfRORBskhMbXduUIuqdZzQgwa MIME-Version: 1.0 X-Received: by 10.52.0.52 with SMTP id 20mr3726074vdb.22.1376399929892; Tue, 13 Aug 2013 06:18:49 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Tue, 13 Aug 2013 06:18:49 -0700 (PDT) In-Reply-To: References: Date: Tue, 13 Aug 2013 21:18:49 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7bacbce8e3f53b04e3d414fe Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 13:18:55 -0000 --047d7bacbce8e3f53b04e3d414fe Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne wrote: > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s. > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case? > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote: > >> Hello Xavi:**** >> >> ** ** >> >> Sure. NUD generates a reactive keep alive. Proactive heart beat that >> comes at a periodic battery drain. Question is what is the optimal way w= ith >> TSCH for a child to find that the parent is gone, in the absence of traf= fic? >> **** >> >> Knowing that we=92ll have (or not) EBs, and that we will (or not) time s= ync >> from the RPL parent, there is probably something we can recommend, and >> limitations to the granularity that we get.**** >> >> ** ** >> >> Cheers,**** >> >> ** ** >> >> Pascal**** >> >> ** ** >> >> *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] >> *Sent:* lundi 12 ao=FBt 2013 20:38 >> *To:* Pascal Thubert (pthubert) >> *Cc:* Thomas Watteyne; 6tsch@ietf.org >> *Subject:* Re: [6tsch] RPL on Basic**** >> >> ** ** >> >> Hi Pascal, >> >> *[] *We need to discuss NUD as well. How do we know a peer is gone >> missing? Only reactive to traffic has issues like a child may never real= ize >> a parent is gone if there is no outwards traffic so it will fail to upda= te >> DAO states. How can MAC mechanisms help?**** >> >> Keep alive packets help on that. :-)**** >> >> X**** >> >> ** ** >> >> On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < >> pthubert@cisco.com> wrote:**** >> >> Hello Xavi:**** >> >> **** >> >> **** >> >> Please see inline**** >> >> **** >> >> -RPL objective function calculation using Neighbors information describe= d >> in Basic configuration. **** >> >> -this includes how OF is calculated using numTx and numTxACK, etc.. = * >> *** >> >> **** >> >> *[] ***** >> >> -RPL configuration:**** >> >> - storing mode vs non-storing mode (I vote for non-storing mode for >> a basic configuration)**** >> >> **** >> >> *[] *I would MUST the non-storing and MAY the storing mode support. It= =92s >> still good t enable storing mode interop for larger devices.**** >> >> **** >> >> - DIO period. Whether we use trickle algorithm (and we define the >> initial period) or we use a fix period for DIO (no trickle) for basic >> configuration.**** >> >> -DAO period, idem.**** >> >> *[] *I=92d seek for a recommendation from Phil on the trickle setting.**= ** >> >> I kindly ask for opinions and contribution to this items so we can start >> narrowing the content.**** >> >> *[] *We need to discuss NUD as well. How do we know a peer is gone >> missing? Only reactive to traffic has issues like a child may never real= ize >> a parent is gone if there is no outwards traffic so it will fail to upda= te >> DAO states. How can MAC mechanisms help?**** >> >> Some of that discussion may be spread between other drafts like the >> architecture.**** >> >> **** >> >> Cheers;**** >> >> **** >> >> Pascal**** >> >> **** >> >> thanks! >> X**** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> **** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> ** ** >> > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7bacbce8e3f53b04e3d414fe Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Thomas and Xavi,

    I remember keep-ali= ve usually use dedicated cell, instead of shared cell, e.g. a Rx cell in ch= ild, and a Tx cell in parent. But, with EB-based schedule establishment, a = child will only have shared cell. And then, keep-alive has to use shared ce= ll, which may result in more collision and then traffic.

    Thought?

    Qin=A0


    On Tue, Aug 13, = 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu&= gt; wrote:
    We established a while ago = that we could reuse the RPL DAG structure for timekeeping. That is, a node&= #39;s routing parent coincides with its TSCH time source neighbor. As a res= ult, and as part of IEEE802.15.4e's normal operation, a node keeps sync= hronized with its RPL parent. In the absence of traffic, the node will peri= odically "keep alive" (per Xavi's e-mail) to the parent. How = often depends on a number of factors, including crystal drift and guard tim= e, but in a typical case, a node will realize its routing parent is missing= after 30-60s.

    I believe this mechanism can serve for NUD, at least n the c= hild->parent case. Of course, this alone does no cover parent->child = or NUD between siblings. Any thoughts on the implications of limiting NUD t= o the child->parent case?

    On Mon, Aug 12, 2= 013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery dra= in. Question is what is the optimal way with TSCH for a child to find that the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity that we get.

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hell= o Xavi:

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7bacbce8e3f53b04e3d414fe-- From P.Zand@utwente.nl Tue Aug 13 07:19:30 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 83AFC21E814A for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 07:19:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.503 X-Spam-Level: X-Spam-Status: No, score=-0.503 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tNPPFbE0xDzU for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 07:19:25 -0700 (PDT) Received: from EXEDGE01.ad.utwente.nl (exedge01.ad.utwente.nl [130.89.5.48]) by ietfa.amsl.com (Postfix) with ESMTP id 9E9EF21E8119 for <6tsch@ietf.org>; Tue, 13 Aug 2013 07:19:23 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE01.ad.utwente.nl (130.89.5.48) with Microsoft SMTP Server (TLS) id 14.2.328.9; Tue, 13 Aug 2013 16:19:23 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Tue, 13 Aug 2013 16:19:22 +0200 From: To: , Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheg Date: Tue, 13 Aug 2013 14:19:21 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79EXMBX23adutwent_" MIME-Version: 1.0 Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 14:19:30 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79EXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Q= in Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79EXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Dear Qin, All,=

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent for a while. But, in this basic RPL, we might use the = shared cell, as a temporary solution, to send the keep-alive to a particula= r neighbor. For sure, if the sender packet is not acknowledged (by the firs= t time), the sender can’t find, if the transmission is collided or if the connection to the neighbor/paren= t is lost. In this case I think we need to retry several times based on TSC= H retransmission algorithm on those shared cells. If all the retries fails = then the connection to the neighbor/parent is lost.

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by= Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message pe= riodically to let the node to be recognized by its neighbor?

     <= /p>

    Best wishes,

    Pouria<= /p>

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell.= And then, keep-alive has to use shared cell, which may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coincide= s with its TSCH time source neighbor. As a result, and as part of IEEE802.1= 5.4e's normal operation, a node keeps synchronized with its RPL parent. In the absence of traffic, the node will= periodically "keep alive" (per Xavi's e-mail) to the parent. How= often depends on a number of factors, including crystal drift and guard ti= me, but in a typical case, a node will realize its routing parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiti= ng NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation using Neighbors information de= scribed in Basic configuration.

        -this includes how OF is calculated using numTx= and numTxACK, etc..

     

    []

    -RPL configuration:

         - storing mode vs non-storing mode (I vot= e for non-storing mode for a basic configuration)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79EXMBX23adutwent_-- From pascal.thubert@gmail.com Tue Aug 13 09:25:56 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B635011E819D for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 09:25:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id do9KvOu-t7ZH for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 09:25:53 -0700 (PDT) Received: from mail-la0-x231.google.com (mail-la0-x231.google.com [IPv6:2a00:1450:4010:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id 1978E11E816D for <6tsch@ietf.org>; Tue, 13 Aug 2013 09:25:06 -0700 (PDT) Received: by mail-la0-f49.google.com with SMTP id ev20so5888170lab.22 for <6tsch@ietf.org>; Tue, 13 Aug 2013 09:25:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=iEsv859eO3Sy7yIUd1P073clSKrFoQEdHBe/kf+lKwY=; b=UeLQw4ge7Jp/rvu+HZ+bw0urojnY0aLqDCwwhOWBMlFneurrU+tDfTeKDzlNEy4LHI nc0DtBQ9SEUPbLsbtCcOsIME0AIgZUNrtODe+YI7WTDfMA1Hs6x4Qva2Q3czEmoeRkKE liqwQhOReU8IKSzF/QLlUK/K0Jtk7uBO+JfzuvMevwICpSoPmRYMUyxGiDpoZvhkoH3R koLi745teRC8H7h75u9+aolysI4UwKt4VPNIPIRr66SZA5C7gM2CZ4WUMYERxX/QGTMg njO2GieOt7DvHsnM7BJNAmXybgmzmXq2SJnx6h5dsRAogGvkkTv9pBGM7gGwraweDR8n CFYw== MIME-Version: 1.0 X-Received: by 10.112.210.136 with SMTP id mu8mr4295709lbc.25.1376411105301; Tue, 13 Aug 2013 09:25:05 -0700 (PDT) Received: by 10.112.75.9 with HTTP; Tue, 13 Aug 2013 09:25:05 -0700 (PDT) In-Reply-To: References: Date: Tue, 13 Aug 2013 18:25:05 +0200 Message-ID: From: Pascal Thubert To: Thomas Watteyne Content-Type: multipart/alternative; boundary=001a11c3c704ff185404e3d6aee5 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 16:25:56 -0000 --001a11c3c704ff185404e3d6aee5 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable hello Thomas This is exactly the sort of text I'm asking for. Make a decision, show the limits. NUD parent to child is secondary because we can still react to traffic. The problem with child to parent is that the child must select a new parent and send DAOs so as to be able to get traffic back. In the case of unidirectional traffic to the device, this would never happen if ther is no NUD that is independent of the traffic. This part of the discussion may be split between the basic doc and teh architecture doc, though... Cheers, Pascal 2013/8/13 Thomas Watteyne > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s. > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case? > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote: > >> Hello Xavi:**** >> >> ** ** >> >> Sure. NUD generates a reactive keep alive. Proactive heart beat that >> comes at a periodic battery drain. Question is what is the optimal way w= ith >> TSCH for a child to find that the parent is gone, in the absence of traf= fic? >> **** >> >> Knowing that we=92ll have (or not) EBs, and that we will (or not) time s= ync >> from the RPL parent, there is probably something we can recommend, and >> limitations to the granularity that we get.**** >> >> ** ** >> >> Cheers,**** >> >> ** ** >> >> Pascal**** >> >> ** ** >> >> *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] >> *Sent:* lundi 12 ao=FBt 2013 20:38 >> *To:* Pascal Thubert (pthubert) >> *Cc:* Thomas Watteyne; 6tsch@ietf.org >> *Subject:* Re: [6tsch] RPL on Basic**** >> >> ** ** >> >> Hi Pascal, >> >> *[] *We need to discuss NUD as well. How do we know a peer is gone >> missing? Only reactive to traffic has issues like a child may never real= ize >> a parent is gone if there is no outwards traffic so it will fail to upda= te >> DAO states. How can MAC mechanisms help?**** >> >> Keep alive packets help on that. :-)**** >> >> X**** >> >> ** ** >> >> On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < >> pthubert@cisco.com> wrote:**** >> >> Hello Xavi:**** >> >> **** >> >> **** >> >> Please see inline**** >> >> **** >> >> -RPL objective function calculation using Neighbors information describe= d >> in Basic configuration. **** >> >> -this includes how OF is calculated using numTx and numTxACK, etc.. = * >> *** >> >> **** >> >> *[] ***** >> >> -RPL configuration:**** >> >> - storing mode vs non-storing mode (I vote for non-storing mode for >> a basic configuration)**** >> >> **** >> >> *[] *I would MUST the non-storing and MAY the storing mode support. It= =92s >> still good t enable storing mode interop for larger devices.**** >> >> **** >> >> - DIO period. Whether we use trickle algorithm (and we define the >> initial period) or we use a fix period for DIO (no trickle) for basic >> configuration.**** >> >> -DAO period, idem.**** >> >> *[] *I=92d seek for a recommendation from Phil on the trickle setting.**= ** >> >> I kindly ask for opinions and contribution to this items so we can start >> narrowing the content.**** >> >> *[] *We need to discuss NUD as well. How do we know a peer is gone >> missing? Only reactive to traffic has issues like a child may never real= ize >> a parent is gone if there is no outwards traffic so it will fail to upda= te >> DAO states. How can MAC mechanisms help?**** >> >> Some of that discussion may be spread between other drafts like the >> architecture.**** >> >> **** >> >> Cheers;**** >> >> **** >> >> Pascal**** >> >> **** >> >> thanks! >> X**** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> **** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> ** ** >> > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --=20 Pascal --001a11c3c704ff185404e3d6aee5 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    hello Thomas=A0

    This is exactly the sor= t of text I'm asking for. Make a decision, show the limits.
    N= UD parent to child is secondary because we can still react to traffic.=A0
    The problem with child to parent is that the child must select a new p= arent and send DAOs so as to be able to get traffic back.
    In the = case of unidirectional traffic to the device, this would never happen if th= er is no NUD that is independent of the traffic.

    This part of the discussion may be split between the ba= sic doc and teh architecture doc, though...

    Cheers= ,

    Pascal

    2013/8/13 Thomas Watteyne = <watteyn= e@eecs.berkeley.edu>
    We established a while ago that we could reuse the RPL DAG= structure for timekeeping. That is, a node's routing parent coincides = with its TSCH time source neighbor. As a result, and as part of IEEE802.15.= 4e's normal operation, a node keeps synchronized with its RPL parent. I= n the absence of traffic, the node will periodically "keep alive"= (per Xavi's e-mail) to the parent. How often depends on a number of fa= ctors, including crystal drift and guard time, but in a typical case, a nod= e will realize its routing parent is missing after 30-60s.

    I believe this mechanism can serve for NUD, at least n the c= hild->parent case. Of course, this alone does no cover parent->child = or NUD between siblings. Any thoughts on the implications of limiting NUD t= o the child->parent case?

    On Mon, Aug 12, 2= 013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery dra= in. Question is what is the optimal way with TSCH for a child to find that the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity that we get.

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hell= o Xavi:

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
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    =A0



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    --
    Pascal
    --001a11c3c704ff185404e3d6aee5-- From xvilajosana@berkeley.edu Tue Aug 13 09:46:45 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6A66F11E819F for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 09:46:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.976 X-Spam-Level: X-Spam-Status: No, score=-1.976 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vdMDwd9KWfH9 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 09:46:41 -0700 (PDT) Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by ietfa.amsl.com (Postfix) with ESMTP id 3DCD111E8189 for <6tsch@ietf.org>; Tue, 13 Aug 2013 09:46:41 -0700 (PDT) Received: by mail-pd0-f181.google.com with SMTP id g10so5173934pdj.12 for <6tsch@ietf.org>; Tue, 13 Aug 2013 09:46:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=/Iquq/oFP04W9dDuNG/7W8q9UZtsQdtDUM3WNSxEW0g=; b=JmKFd5itbsY5LuvUTZ7khBZgxKvlb4QZOIH+FfcsE5TIBcMSbggj8Puhaq/ln5Tcp1 8WhStaLKEwKQkwGleqH5Lz1dgd2KxbeoMJgeF1Sv5+Y0Ymv2EU5JhmU1kdDq9kZKqSLH YjHZ2qTrJPhCrxnReQYiH1dMVmBqzaOK5zoF9WcInHIb0Kq4xeFmdAEHjZUdKOkX9ilA 2XYZCmh6BhidF/i0X9JvhuazcPDjGMmpAH9PXgZBdJf5XoNVgz9RtBP7Tvy7YvYCrJxW GMT4b8dp9L2/17dbcg3jVgCkBBv5jBmJyGrrIuRPS0UtGPq1NcYFj1Wm7JvNBrww4dbA LNBA== X-Gm-Message-State: ALoCoQm5iWWSJ6eI32HakNPezGBTtv91IQw0sN5mJUSKUTtZuCGEigh9rnBj/Pzr7iL2xMmazHEd MIME-Version: 1.0 X-Received: by 10.68.171.165 with SMTP id av5mr5467196pbc.18.1376412400810; Tue, 13 Aug 2013 09:46:40 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Tue, 13 Aug 2013 09:46:40 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> Date: Tue, 13 Aug 2013 09:46:40 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Pouria Zand Content-Type: multipart/alternative; boundary=047d7b86f77e37076304e3d6fcdc Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 16:46:45 -0000 --047d7b86f77e37076304e3d6fcdc Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pouria, I completely agree with your description. Besides, there isn't a common shared cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happens every 30s). TSCH layer at the begining of a shared tx/rx slot then reads from the queue and sends the packet. This means that the KA can be send in any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, wrote: > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > ** ** > > Best wishes,**** > > Pouria**** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org > > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Hi Thomas and Xavi,**** > > ** ** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > ** ** > > Thought?**** > > ** ** > > Qin **** > > ** ** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > ** ** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > ** ** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > ** ** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b86f77e37076304e3d6fcdc Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pouria,

    I completely agree = with your description. Besides, there isn't a common shared cell to sen= d KAs. I see the operation in the following way:
    6top KA timer exp= ires and places a KA packet into the queue (e.g this happens every 30s). TS= CH layer at the begining of a shared tx/rx slot then reads from the queue a= nd sends the packet. This means that the KA can be send in any shared slot.=

    does it make sense?
    X

    =
    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@= utwente.nl> wrote:

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent for a while. But, in this basic RPL, we might use the = shared cell, as a temporary solution, to send the keep-alive to a particula= r neighbor. For sure, if the sender packet is not acknowledged (by the firs= t time), the sender can=92t find, if the transmission is collided or if the connection to the neighbor/paren= t is lost. In this case I think we need to retry several times based on TSC= H retransmission algorithm on those shared cells. If all the retries fails = then the connection to the neighbor/parent is lost.

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by= Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message pe= riodically to let the node to be recognized by its neighbor?<= /span>

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell.= And then, keep-alive has to use shared cell, which may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE8= 02.15.4e's normal operation, a node keeps synchronized with its RPL parent. In the absence of traffic, the node will= periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiti= ng NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:<= u>

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b86f77e37076304e3d6fcdc-- From qinwang@berkeley.edu Tue Aug 13 10:33:01 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0234621E80D6 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 10:33:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.976 X-Spam-Level: X-Spam-Status: No, score=-2.976 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CLrx4rYpLNlY for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 10:32:56 -0700 (PDT) Received: from mail-ve0-f181.google.com (mail-ve0-f181.google.com [209.85.128.181]) by ietfa.amsl.com (Postfix) with ESMTP id 76AB811E8118 for <6tsch@ietf.org>; Tue, 13 Aug 2013 10:32:56 -0700 (PDT) Received: by mail-ve0-f181.google.com with SMTP id jz10so6774918veb.40 for <6tsch@ietf.org>; Tue, 13 Aug 2013 10:32:54 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=CByLlX1dVl0jUc1LnmrRDSvx5no5i92axT11pic0UOo=; b=RafENvU5DsAllerVxhKih3d3cVU9KKYggkgCOp6MbdZZPoOHcoY6vITsIJTBCO+vAV T82I5MIhOAmq1lPRfrmXKb/dMyV+c5Y3myPxEn1zA/SWZxnooGHTCnVoUkdxFdMCLE6S 2RcNHjJRdV+rMY52a2iBSQL/sMwsHv7vUY36tFk6gAakdzH2qjyTcELM2SsuxHuPCQSk WczFLs2HtdgyiUD+cZ6cuwM52f/5jkUNVfSBrjQ3SKx/gYPE6682elifgxe+cadf+9QD /AWQiM8C5Ju8xg8PTo9OhzDyDD+hwYot83g3fmmG9sd9jfxpvnOTwDmGtiYHC+jBhjnB 7sZg== X-Gm-Message-State: ALoCoQkpkLGxtxkRvuIxSQLcfP1+arB1lSFMXO3kc07G+JlrKNY97QyM2BHHqoAeS7j9tUuhFnc5 MIME-Version: 1.0 X-Received: by 10.58.214.105 with SMTP id nz9mr34797vec.58.1376415174719; Tue, 13 Aug 2013 10:32:54 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Tue, 13 Aug 2013 10:32:54 -0700 (PDT) In-Reply-To: References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> Date: Wed, 14 Aug 2013 01:32:54 +0800 Message-ID: From: Qin Wang To: Xavier Vilajosana Guillen Content-Type: multipart/alternative; boundary=047d7bd6c6428d898f04e3d7a105 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Pouria Zand Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 17:33:01 -0000 --047d7bd6c6428d898f04e3d7a105 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Xavi, I have two questions about the shared cells. (1) Corresponding to a shared cell advertised in EB, what should the cell type be set in the advertiser? Should be Rx? (2) Should it be required for all of the nodes in neighborhood to be awake in the shared cells? Basically, my concern is that when a keep-alive is sent out, the destination node is most likely in listening mode. Thanks Qin On Wed, Aug 14, 2013 at 12:46 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi Pouria, > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way: > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. > > does it make sense? > X > > > On Tue, Aug 13, 2013 at 7:19 AM, wrote: > >> Dear Qin, All,**** >> >> I agree that Keep-alive message need to be sent in the dedicated cell to >> the potential neighbor/parent, whenever the sender has not received any >> packet from its neighbor/parent for a while. But, in this basic RPL, we >> might use the shared cell, as a temporary solution, to send the keep-ali= ve >> to a particular neighbor. For sure, if the sender packet is not >> acknowledged (by the first time), the sender can=92t find, if the >> transmission is collided or if the connection to the neighbor/parent is >> lost. In this case I think we need to retry several times based on TSCH >> retransmission algorithm on those shared cells. If all the retries fails >> then the connection to the neighbor/parent is lost.**** >> >> Since the nodes do not need to send the keep-alive message so often, >> therefore the traffic caused by Keep-alive is not too much.**** >> >> Am I right? **** >> >> BTW, do we have any common shared cell (in the whole network) to >> broadcast the Keep-alive message periodically to let the node to be >> recognized by its neighbor?**** >> >> ** ** >> >> Best wishes,**** >> >> Pouria**** >> >> ** ** >> >> *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On >> Behalf Of *Qin Wang >> *Sent:* Tuesday, August 13, 2013 3:19 PM >> *To:* Thomas Watteyne >> *Cc:* 6tsch@ietf.org >> >> *Subject:* Re: [6tsch] RPL on Basic**** >> >> ** ** >> >> Hi Thomas and Xavi,**** >> >> ** ** >> >> I remember keep-alive usually use dedicated cell, instead of shared cell= , >> e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based >> schedule establishment, a child will only have shared cell. And then, >> keep-alive has to use shared cell, which may result in more collision an= d >> then traffic.**** >> >> ** ** >> >> Thought?**** >> >> ** ** >> >> Qin **** >> >> ** ** >> >> On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < >> watteyne@eecs.berkeley.edu> wrote:**** >> >> We established a while ago that we could reuse the RPL DAG structure for >> timekeeping. That is, a node's routing parent coincides with its TSCH ti= me >> source neighbor. As a result, and as part of IEEE802.15.4e's normal >> operation, a node keeps synchronized with its RPL parent. In the absence= of >> traffic, the node will periodically "keep alive" (per Xavi's e-mail) to = the >> parent. How often depends on a number of factors, including crystal drif= t >> and guard time, but in a typical case, a node will realize its routing >> parent is missing after 30-60s.**** >> >> ** ** >> >> I believe this mechanism can serve for NUD, at least n the child->parent >> case. Of course, this alone does no cover parent->child or NUD between >> siblings. Any thoughts on the implications of limiting NUD to the >> child->parent case?**** >> >> ** ** >> >> On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < >> pthubert@cisco.com> wrote:**** >> >> Hello Xavi:**** >> >> **** >> >> Sure. NUD generates a reactive keep alive. Proactive heart beat that >> comes at a periodic battery drain. Question is what is the optimal way w= ith >> TSCH for a child to find that the parent is gone, in the absence of traf= fic? >> **** >> >> Knowing that we=92ll have (or not) EBs, and that we will (or not) time s= ync >> from the RPL parent, there is probably something we can recommend, and >> limitations to the granularity that we get.**** >> >> **** >> >> Cheers,**** >> >> **** >> >> Pascal**** >> >> **** >> >> *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] >> *Sent:* lundi 12 ao=FBt 2013 20:38 >> *To:* Pascal Thubert (pthubert) >> *Cc:* Thomas Watteyne; 6tsch@ietf.org >> *Subject:* Re: [6tsch] RPL on Basic**** >> >> **** >> >> Hi Pascal, >> >> *[] *We need to discuss NUD as well. How do we know a peer is gone >> missing? Only reactive to traffic has issues like a child may never real= ize >> a parent is gone if there is no outwards traffic so it will fail to upda= te >> DAO states. How can MAC mechanisms help?**** >> >> Keep alive packets help on that. :-)**** >> >> X**** >> >> **** >> >> On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < >> pthubert@cisco.com> wrote:**** >> >> Hello Xavi:**** >> >> **** >> >> **** >> >> Please see inline**** >> >> **** >> >> -RPL objective function calculation using Neighbors information describe= d >> in Basic configuration. **** >> >> -this includes how OF is calculated using numTx and numTxACK, etc.. = * >> *** >> >> **** >> >> *[] ***** >> >> -RPL configuration:**** >> >> - storing mode vs non-storing mode (I vote for non-storing mode for >> a basic configuration)**** >> >> **** >> >> *[] *I would MUST the non-storing and MAY the storing mode support. It= =92s >> still good t enable storing mode interop for larger devices.**** >> >> **** >> >> - DIO period. Whether we use trickle algorithm (and we define the >> initial period) or we use a fix period for DIO (no trickle) for basic >> configuration.**** >> >> -DAO period, idem.**** >> >> *[] *I=92d seek for a recommendation from Phil on the trickle setting.**= ** >> >> I kindly ask for opinions and contribution to this items so we can start >> narrowing the content.**** >> >> *[] *We need to discuss NUD as well. How do we know a peer is gone >> missing? Only reactive to traffic has issues like a child may never real= ize >> a parent is gone if there is no outwards traffic so it will fail to upda= te >> DAO states. How can MAC mechanisms help?**** >> >> Some of that discussion may be spread between other drafts like the >> architecture.**** >> >> **** >> >> Cheers;**** >> >> **** >> >> Pascal**** >> >> **** >> >> thanks! >> X**** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> **** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> **** >> >> ** ** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> ** ** >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > --047d7bd6c6428d898f04e3d7a105 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Xavi,

    I have two questions about the= shared cells.

    (1) Corresponding to a shared cell = advertised in EB, what should the cell type be set in the advertiser? Shoul= d be Rx?
    (2) Should it be required for all of the nodes in neighborhood to be a= wake in the shared cells?

    Basically, my concern is= that when a keep-alive is sent out, the destination node is most likely in= listening mode.=A0

    Thanks
    Qin


    On Wed, Aug 14, 2013 at 12:46 AM, Xa= vier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>= wrote:
    Hi Pouria,
    I completely agree with your description. Besides, there isn= 9;t a common shared cell to send KAs. I see the operation in the following = way:
    6top KA timer expires and places a KA packet into the queue (e.g this= happens every 30s). TSCH layer at the begining of a shared tx/rx slot then= reads from the queue and sends the packet. This means that the KA can be s= end in any shared slot.

    does it make sense?
    X


    On Tue, Aug 13, 20= 13 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent for a while. But, in this basic RPL, we might use the = shared cell, as a temporary solution, to send the keep-alive to a particula= r neighbor. For sure, if the sender packet is not acknowledged (by the firs= t time), the sender can=92t find, if the transmission is collided or if the connection to the neighbor/paren= t is lost. In this case I think we need to retry several times based on TSC= H retransmission algorithm on those shared cells. If all the retries fails = then the connection to the neighbor/parent is lost.

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by= Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message pe= riodically to let the node to be recognized by its neighbor?<= /span>

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell.= And then, keep-alive has to use shared cell, which may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE8= 02.15.4e's normal operation, a node keeps synchronized with its RPL parent. In the absence of traffic, the node will= periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiti= ng NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    --047d7bd6c6428d898f04e3d7a105-- From xvilajosana@berkeley.edu Tue Aug 13 10:44:43 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B92B511E8118 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 10:44:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.176 X-Spam-Level: X-Spam-Status: No, score=-2.176 tagged_above=-999 required=5 tests=[AWL=0.200, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_22=0.6, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3KdrQwLD+yKX for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 10:44:39 -0700 (PDT) Received: from mail-pa0-f45.google.com (mail-pa0-f45.google.com [209.85.220.45]) by ietfa.amsl.com (Postfix) with ESMTP id 9000B21F9E6A for <6tsch@ietf.org>; Tue, 13 Aug 2013 10:44:38 -0700 (PDT) Received: by mail-pa0-f45.google.com with SMTP id bg4so9170455pad.32 for <6tsch@ietf.org>; Tue, 13 Aug 2013 10:44:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=c43SmTk1GiiH31BuszyScK4Y6bx5TUN3tE7KILWji4Y=; b=fw323kb3TwWgmnkbsX2KAq6Usj1DJ03V0WOkur0M5vRivIwkW2Tq7jmqCTeKNWwxUQ 7PfsyhI3vFQovC54mrsXbn7DZpkPoZHITlS6JfcbLyOQwzCw5P52nPbppDTRmt+wOn3r HfsO4sLeAtswC4JI4yv1NxGvYGGA16FmEE1ObyU84md/efIvvYTYhELrVh/fqDP/d700 2sek2KwJDBF9P9ntZOsJquWwhAbQn0FhfmhkDip5u0PL04rowD66uwktyTWLl8taWIV3 IYiMkt1OTDCjwFQ5KDgN5bxumxPxPNpt5kEStjdCdfKMY50ZSXLcAoFn7BZwrS8Z9G8O IjJw== X-Gm-Message-State: ALoCoQn5FnUyeCL6c3i9DUaDWoilIUHc6TpFqLzxwG0qsZDxJNqC3UaIZh5q1K6XWBq0rJ+q+mPQ MIME-Version: 1.0 X-Received: by 10.66.27.143 with SMTP id t15mr3119090pag.171.1376415878157; Tue, 13 Aug 2013 10:44:38 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Tue, 13 Aug 2013 10:44:38 -0700 (PDT) In-Reply-To: References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> Date: Tue, 13 Aug 2013 10:44:38 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=bcaec52bea197b31b704e3d7cb0f Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Pouria Zand Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 17:44:43 -0000 --bcaec52bea197b31b704e3d7cb0f Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Qin, see inline Hi Xavi, I have two questions about the shared cells. (1) Corresponding to a shared cell advertised in EB, what should the cell type be set in the advertiser? Should be Rx? The cell type is defined in a bitmap. The TX,RX and SHARED bits should be set. (2) Should it be required for all of the nodes in neighborhood to be awake in the shared cells? Well, if cells are shared (slotted aloha), nodes wake up, if they have something to transmit they transmit, if not, they listen. If there is nothing to be listened the slot becomes an idle listen slot, which means that the radio is only on for the duration of the guard time. If a packet arrives the node gets it. (in fact all listening nodes that can hear the packet get it but the packet is discarded by all of them except the destination. This happens at the MAC layer as the destination address does not match to the node's address) Basically, my concern is that when a keep-alive is sent out, the destination node is most likely in listening mode. Most likely is in listening mode unless has something to transmit at that slot, then a collision will happen. Is there something that you don't like about that approach :-) ? X Thanks On Tue, Aug 13, 2013 at 10:32 AM, Qin Wang wrote: > Hi Xavi, > > I have two questions about the shared cells. > > (1) Corresponding to a shared cell advertised in EB, what should the cell > type be set in the advertiser? Should be Rx? > (2) Should it be required for all of the nodes in neighborhood to be awak= e > in the shared cells? > > Basically, my concern is that when a keep-alive is sent out, the > destination node is most likely in listening mode. > > Thanks > Qin > > > On Wed, Aug 14, 2013 at 12:46 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote: > >> Hi Pouria, >> >> I completely agree with your description. Besides, there isn't a common >> shared cell to send KAs. I see the operation in the following way: >> 6top KA timer expires and places a KA packet into the queue (e.g this >> happens every 30s). TSCH layer at the begining of a shared tx/rx slot th= en >> reads from the queue and sends the packet. This means that the KA can be >> send in any shared slot. >> >> does it make sense? >> X >> >> >> On Tue, Aug 13, 2013 at 7:19 AM, wrote: >> >>> Dear Qin, All,**** >>> >>> I agree that Keep-alive message need to be sent in the dedicated cell t= o >>> the potential neighbor/parent, whenever the sender has not received any >>> packet from its neighbor/parent for a while. But, in this basic RPL, we >>> might use the shared cell, as a temporary solution, to send the keep-al= ive >>> to a particular neighbor. For sure, if the sender packet is not >>> acknowledged (by the first time), the sender can=92t find, if the >>> transmission is collided or if the connection to the neighbor/parent is >>> lost. In this case I think we need to retry several times based on TSCH >>> retransmission algorithm on those shared cells. If all the retries fail= s >>> then the connection to the neighbor/parent is lost.**** >>> >>> Since the nodes do not need to send the keep-alive message so often, >>> therefore the traffic caused by Keep-alive is not too much.**** >>> >>> Am I right? **** >>> >>> BTW, do we have any common shared cell (in the whole network) to >>> broadcast the Keep-alive message periodically to let the node to be >>> recognized by its neighbor?**** >>> >>> ** ** >>> >>> Best wishes,**** >>> >>> Pouria**** >>> >>> ** ** >>> >>> *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On >>> Behalf Of *Qin Wang >>> *Sent:* Tuesday, August 13, 2013 3:19 PM >>> *To:* Thomas Watteyne >>> *Cc:* 6tsch@ietf.org >>> >>> *Subject:* Re: [6tsch] RPL on Basic**** >>> >>> ** ** >>> >>> Hi Thomas and Xavi,**** >>> >>> ** ** >>> >>> I remember keep-alive usually use dedicated cell, instead of shared >>> cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-ba= sed >>> schedule establishment, a child will only have shared cell. And then, >>> keep-alive has to use shared cell, which may result in more collision a= nd >>> then traffic.**** >>> >>> ** ** >>> >>> Thought?**** >>> >>> ** ** >>> >>> Qin **** >>> >>> ** ** >>> >>> On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < >>> watteyne@eecs.berkeley.edu> wrote:**** >>> >>> We established a while ago that we could reuse the RPL DAG structure fo= r >>> timekeeping. That is, a node's routing parent coincides with its TSCH t= ime >>> source neighbor. As a result, and as part of IEEE802.15.4e's normal >>> operation, a node keeps synchronized with its RPL parent. In the absenc= e of >>> traffic, the node will periodically "keep alive" (per Xavi's e-mail) to= the >>> parent. How often depends on a number of factors, including crystal dri= ft >>> and guard time, but in a typical case, a node will realize its routing >>> parent is missing after 30-60s.**** >>> >>> ** ** >>> >>> I believe this mechanism can serve for NUD, at least n the child->paren= t >>> case. Of course, this alone does no cover parent->child or NUD between >>> siblings. Any thoughts on the implications of limiting NUD to the >>> child->parent case?**** >>> >>> ** ** >>> >>> On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < >>> pthubert@cisco.com> wrote:**** >>> >>> Hello Xavi:**** >>> >>> **** >>> >>> Sure. NUD generates a reactive keep alive. Proactive heart beat that >>> comes at a periodic battery drain. Question is what is the optimal way = with >>> TSCH for a child to find that the parent is gone, in the absence of tra= ffic? >>> **** >>> >>> Knowing that we=92ll have (or not) EBs, and that we will (or not) time >>> sync from the RPL parent, there is probably something we can recommend,= and >>> limitations to the granularity that we get.**** >>> >>> **** >>> >>> Cheers,**** >>> >>> **** >>> >>> Pascal**** >>> >>> **** >>> >>> *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu= ] >>> >>> *Sent:* lundi 12 ao=FBt 2013 20:38 >>> *To:* Pascal Thubert (pthubert) >>> *Cc:* Thomas Watteyne; 6tsch@ietf.org >>> *Subject:* Re: [6tsch] RPL on Basic**** >>> >>> **** >>> >>> Hi Pascal, >>> >>> *[] *We need to discuss NUD as well. How do we know a peer is gone >>> missing? Only reactive to traffic has issues like a child may never rea= lize >>> a parent is gone if there is no outwards traffic so it will fail to upd= ate >>> DAO states. How can MAC mechanisms help?**** >>> >>> Keep alive packets help on that. :-)**** >>> >>> X**** >>> >>> **** >>> >>> On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < >>> pthubert@cisco.com> wrote:**** >>> >>> Hello Xavi:**** >>> >>> **** >>> >>> **** >>> >>> Please see inline**** >>> >>> **** >>> >>> -RPL objective function calculation using Neighbors information >>> described in Basic configuration. **** >>> >>> -this includes how OF is calculated using numTx and numTxACK, etc.. >>> **** >>> >>> **** >>> >>> *[] ***** >>> >>> -RPL configuration:**** >>> >>> - storing mode vs non-storing mode (I vote for non-storing mode fo= r >>> a basic configuration)**** >>> >>> **** >>> >>> *[] *I would MUST the non-storing and MAY the storing mode support. >>> It=92s still good t enable storing mode interop for larger devices.**** >>> >>> **** >>> >>> - DIO period. Whether we use trickle algorithm (and we define the >>> initial period) or we use a fix period for DIO (no trickle) for basic >>> configuration.**** >>> >>> -DAO period, idem.**** >>> >>> *[] *I=92d seek for a recommendation from Phil on the trickle setting.*= *** >>> >>> I kindly ask for opinions and contribution to this items so we can star= t >>> narrowing the content.**** >>> >>> *[] *We need to discuss NUD as well. How do we know a peer is gone >>> missing? Only reactive to traffic has issues like a child may never rea= lize >>> a parent is gone if there is no outwards traffic so it will fail to upd= ate >>> DAO states. How can MAC mechanisms help?**** >>> >>> Some of that discussion may be spread between other drafts like the >>> architecture.**** >>> >>> **** >>> >>> Cheers;**** >>> >>> **** >>> >>> Pascal**** >>> >>> **** >>> >>> thanks! >>> X**** >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch**** >>> >>> **** >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch**** >>> >>> **** >>> >>> ** ** >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch**** >>> >>> ** ** >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> > --bcaec52bea197b31b704e3d7cb0f Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi= Qin, see inline3D""


    Hi Xavi,
    I have two questions about the shared cells.

    = (1) Corresponding to a shared cell advertised in EB, what should the cell t= ype be set in the advertiser? Should be Rx?

    The cell type is defined in a b= itmap. The TX,RX and SHARED bits should be set.

    (2) Should it= be required for all of the nodes in neighborhood to be awake in the shared= cells?

    Well, if cells are shared (slotted aloha), nodes wake up, = if they have something to transmit they transmit, if not, they listen. If t= here is nothing to be listened the slot becomes an idle listen slot, which = means that the radio is only on for the duration of the guard time.=A0 If a= packet arrives the node gets it. (in fact all listening nodes that can hea= r the packet get it but the packet is discarded by all of them except the d= estination. This happens at the MAC layer as the destination address does n= ot match to the node's address)


    Basically, my concern is that when a keep-alive is sent = out, the destination node is most likely in listening mode.

    <= span style=3D"color:rgb(0,0,255)">Most likely is in listening mode unless h= as something to transmit at that slot, then a collision will happen.
    Is there something that you= don't like about that approach :-) ?

    X

    Thanks


    On Tue, Aug 13, 2013 at 10:32 AM, = Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Xavi,

    I have two questions about the shared cells.

    (1) = Corresponding to a shared cell advertised in EB, what should the cell type = be set in the advertiser? Should be Rx?
    (2) Should it be required for all of the nodes in neighborhood to be a= wake in the shared cells?

    Basically, my concern is= that when a keep-alive is sent out, the destination node is most likely in= listening mode.=A0

    Thanks
    Qin


    On Wed, Au= g 14, 2013 at 12:46 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:
    Hi Pouria,
    I completely agree with your description. Besides, there isn= 9;t a common shared cell to send KAs. I see the operation in the following = way:
    6top KA timer expires and places a KA packet into the queue (e.g this= happens every 30s). TSCH layer at the begining of a shared tx/rx slot then= reads from the queue and sends the packet. This means that the KA can be s= end in any shared slot.

    does it make sense?
    X
    =


    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent for a while. But, in this basic RPL, we might use the = shared cell, as a temporary solution, to send the keep-alive to a particula= r neighbor. For sure, if the sender packet is not acknowledged (by the firs= t time), the sender can=92t find, if the transmission is collided or if the connection to the neighbor/paren= t is lost. In this case I think we need to retry several times based on TSC= H retransmission algorithm on those shared cells. If all the retries fails = then the connection to the neighbor/parent is lost.

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by= Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message pe= riodically to let the node to be recognized by its neighbor?<= /span>

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell.= And then, keep-alive has to use shared cell, which may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE8= 02.15.4e's normal operation, a node keeps synchronized with its RPL parent. In the absence of traffic, the node will= periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiti= ng NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch




    --bcaec52bea197b31b704e3d7cb0f-- From qinwang@berkeley.edu Tue Aug 13 11:06:27 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 391A221E804E for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 11:06:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.676 X-Spam-Level: X-Spam-Status: No, score=-2.676 tagged_above=-999 required=5 tests=[AWL=-0.300, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_22=0.6, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nl7HWe2Ryd08 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 11:06:23 -0700 (PDT) Received: from mail-vb0-f48.google.com (mail-vb0-f48.google.com [209.85.212.48]) by ietfa.amsl.com (Postfix) with ESMTP id 706FE11E8118 for <6tsch@ietf.org>; Tue, 13 Aug 2013 11:06:21 -0700 (PDT) Received: by mail-vb0-f48.google.com with SMTP id w16so6935835vbf.35 for <6tsch@ietf.org>; Tue, 13 Aug 2013 11:06:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=w5irEuYE+LeV+AT0BeTRpW5VXHeFouaejiQdznfRO8M=; b=NechPFKfRoeliQq2VANKbFOBkomPMDsyIrX8TqIpKXd3sIrjzK1lM0GCMbcqB1stA6 +m4oycoY5IhhjUc+TN94Cr7D3oC72av6KXWIQ/rkc59ZAk2C7PgtfK/yntkjLmB80PTs HhUVX1Eyp/oG/548Zfc+kYCaw/eZ4xLb9MENDu4Gre26GQO4JqDKY83zwah8lyxrSNgZ /S0M0wsm0hANhwwWXHTruY4/owDX4dvXFGCcRnyCVOMWjldJSGUuyHMPrJFPtl9pAsap yM7X+Pnp+74HDqIkzDsg9+475QlwH78epF4k7wsyrBPy4CJkqEsOPTU1XE16i38/7HKF 3lzg== X-Gm-Message-State: ALoCoQnYcpgbTloX9BRhsjgOXSgOY1PZVpOCOX3UW5yt70as5QKD3l12XrTkN/VZ3FZgOmqgtHfn MIME-Version: 1.0 X-Received: by 10.220.10.194 with SMTP id q2mr5410403vcq.2.1376417180479; Tue, 13 Aug 2013 11:06:20 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Tue, 13 Aug 2013 11:06:20 -0700 (PDT) In-Reply-To: References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> Date: Wed, 14 Aug 2013 02:06:20 +0800 Message-ID: From: Qin Wang To: Xavier Vilajosana Guillen Content-Type: multipart/alternative; boundary=001a11c3b9441afe5904e3d81902 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Pouria Zand Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 18:06:27 -0000 --001a11c3b9441afe5904e3d81902 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Xavi, I agree to using keep-alive as one of UND methods. For this purpose, I think we should add some configuration profile in the documents, something like your answers to my questions. Make sense? Qin On Wed, Aug 14, 2013 at 1:44 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi Qin, see inline > > > Hi Xavi, > > I have two questions about the shared cells. > > (1) Corresponding to a shared cell advertised in EB, what should the cell > type be set in the advertiser? Should be Rx? > > The cell type is defined in a bitmap. The TX,RX and SHARED bits should be > set. > > (2) Should it be required for all of the nodes in neighborhood to be awak= e > in the shared cells? > > Well, if cells are shared (slotted aloha), nodes wake up, if they have > something to transmit they transmit, if not, they listen. If there is > nothing to be listened the slot becomes an idle listen slot, which means > that the radio is only on for the duration of the guard time. If a packe= t > arrives the node gets it. (in fact all listening nodes that can hear the > packet get it but the packet is discarded by all of them except the > destination. This happens at the MAC layer as the destination address doe= s > not match to the node's address) > > > Basically, my concern is that when a keep-alive is sent out, the > destination node is most likely in listening mode. > > Most likely is in listening mode unless has something to transmit at that > slot, then a collision will happen. > Is there something that you don't like about that approach :-) ? > > X > > Thanks > > > On Tue, Aug 13, 2013 at 10:32 AM, Qin Wang wrote: > >> Hi Xavi, >> >> I have two questions about the shared cells. >> >> (1) Corresponding to a shared cell advertised in EB, what should the cel= l >> type be set in the advertiser? Should be Rx? >> (2) Should it be required for all of the nodes in neighborhood to be >> awake in the shared cells? >> >> Basically, my concern is that when a keep-alive is sent out, the >> destination node is most likely in listening mode. >> >> Thanks >> Qin >> >> >> On Wed, Aug 14, 2013 at 12:46 AM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote: >> >>> Hi Pouria, >>> >>> I completely agree with your description. Besides, there isn't a common >>> shared cell to send KAs. I see the operation in the following way: >>> 6top KA timer expires and places a KA packet into the queue (e.g this >>> happens every 30s). TSCH layer at the begining of a shared tx/rx slot t= hen >>> reads from the queue and sends the packet. This means that the KA can b= e >>> send in any shared slot. >>> >>> does it make sense? >>> X >>> >>> >>> On Tue, Aug 13, 2013 at 7:19 AM, wrote: >>> >>>> Dear Qin, All,**** >>>> >>>> I agree that Keep-alive message need to be sent in the dedicated cell >>>> to the potential neighbor/parent, whenever the sender has not received= any >>>> packet from its neighbor/parent for a while. But, in this basic RPL, w= e >>>> might use the shared cell, as a temporary solution, to send the keep-a= live >>>> to a particular neighbor. For sure, if the sender packet is not >>>> acknowledged (by the first time), the sender can=92t find, if the >>>> transmission is collided or if the connection to the neighbor/parent i= s >>>> lost. In this case I think we need to retry several times based on TSC= H >>>> retransmission algorithm on those shared cells. If all the retries fai= ls >>>> then the connection to the neighbor/parent is lost.**** >>>> >>>> Since the nodes do not need to send the keep-alive message so often, >>>> therefore the traffic caused by Keep-alive is not too much.**** >>>> >>>> Am I right? **** >>>> >>>> BTW, do we have any common shared cell (in the whole network) to >>>> broadcast the Keep-alive message periodically to let the node to be >>>> recognized by its neighbor?**** >>>> >>>> ** ** >>>> >>>> Best wishes,**** >>>> >>>> Pouria**** >>>> >>>> ** ** >>>> >>>> *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On >>>> Behalf Of *Qin Wang >>>> *Sent:* Tuesday, August 13, 2013 3:19 PM >>>> *To:* Thomas Watteyne >>>> *Cc:* 6tsch@ietf.org >>>> >>>> *Subject:* Re: [6tsch] RPL on Basic**** >>>> >>>> ** ** >>>> >>>> Hi Thomas and Xavi,**** >>>> >>>> ** ** >>>> >>>> I remember keep-alive usually use dedicated cell, instead of shared >>>> cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-b= ased >>>> schedule establishment, a child will only have shared cell. And then, >>>> keep-alive has to use shared cell, which may result in more collision = and >>>> then traffic.**** >>>> >>>> ** ** >>>> >>>> Thought?**** >>>> >>>> ** ** >>>> >>>> Qin **** >>>> >>>> ** ** >>>> >>>> On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < >>>> watteyne@eecs.berkeley.edu> wrote:**** >>>> >>>> We established a while ago that we could reuse the RPL DAG structure >>>> for timekeeping. That is, a node's routing parent coincides with its T= SCH >>>> time source neighbor. As a result, and as part of IEEE802.15.4e's norm= al >>>> operation, a node keeps synchronized with its RPL parent. In the absen= ce of >>>> traffic, the node will periodically "keep alive" (per Xavi's e-mail) t= o the >>>> parent. How often depends on a number of factors, including crystal dr= ift >>>> and guard time, but in a typical case, a node will realize its routing >>>> parent is missing after 30-60s.**** >>>> >>>> ** ** >>>> >>>> I believe this mechanism can serve for NUD, at least n the >>>> child->parent case. Of course, this alone does no cover parent->child = or >>>> NUD between siblings. Any thoughts on the implications of limiting NUD= to >>>> the child->parent case?**** >>>> >>>> ** ** >>>> >>>> On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < >>>> pthubert@cisco.com> wrote:**** >>>> >>>> Hello Xavi:**** >>>> >>>> **** >>>> >>>> Sure. NUD generates a reactive keep alive. Proactive heart beat that >>>> comes at a periodic battery drain. Question is what is the optimal way= with >>>> TSCH for a child to find that the parent is gone, in the absence of tr= affic? >>>> **** >>>> >>>> Knowing that we=92ll have (or not) EBs, and that we will (or not) time >>>> sync from the RPL parent, there is probably something we can recommend= , and >>>> limitations to the granularity that we get.**** >>>> >>>> **** >>>> >>>> Cheers,**** >>>> >>>> **** >>>> >>>> Pascal**** >>>> >>>> **** >>>> >>>> *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.ed= u] >>>> >>>> *Sent:* lundi 12 ao=FBt 2013 20:38 >>>> *To:* Pascal Thubert (pthubert) >>>> *Cc:* Thomas Watteyne; 6tsch@ietf.org >>>> *Subject:* Re: [6tsch] RPL on Basic**** >>>> >>>> **** >>>> >>>> Hi Pascal, >>>> >>>> *[] *We need to discuss NUD as well. How do we know a peer is gone >>>> missing? Only reactive to traffic has issues like a child may never re= alize >>>> a parent is gone if there is no outwards traffic so it will fail to up= date >>>> DAO states. How can MAC mechanisms help?**** >>>> >>>> Keep alive packets help on that. :-)**** >>>> >>>> X**** >>>> >>>> **** >>>> >>>> On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < >>>> pthubert@cisco.com> wrote:**** >>>> >>>> Hello Xavi:**** >>>> >>>> **** >>>> >>>> **** >>>> >>>> Please see inline**** >>>> >>>> **** >>>> >>>> -RPL objective function calculation using Neighbors information >>>> described in Basic configuration. **** >>>> >>>> -this includes how OF is calculated using numTx and numTxACK, etc.= . >>>> **** >>>> >>>> **** >>>> >>>> *[] ***** >>>> >>>> -RPL configuration:**** >>>> >>>> - storing mode vs non-storing mode (I vote for non-storing mode >>>> for a basic configuration)**** >>>> >>>> **** >>>> >>>> *[] *I would MUST the non-storing and MAY the storing mode support. >>>> It=92s still good t enable storing mode interop for larger devices.***= * >>>> >>>> **** >>>> >>>> - DIO period. Whether we use trickle algorithm (and we define the >>>> initial period) or we use a fix period for DIO (no trickle) for basic >>>> configuration.**** >>>> >>>> -DAO period, idem.**** >>>> >>>> *[] *I=92d seek for a recommendation from Phil on the trickle setting.= *** >>>> * >>>> >>>> I kindly ask for opinions and contribution to this items so we can >>>> start narrowing the content.**** >>>> >>>> *[] *We need to discuss NUD as well. How do we know a peer is gone >>>> missing? Only reactive to traffic has issues like a child may never re= alize >>>> a parent is gone if there is no outwards traffic so it will fail to up= date >>>> DAO states. How can MAC mechanisms help?**** >>>> >>>> Some of that discussion may be spread between other drafts like the >>>> architecture.**** >>>> >>>> **** >>>> >>>> Cheers;**** >>>> >>>> **** >>>> >>>> Pascal**** >>>> >>>> **** >>>> >>>> thanks! >>>> X**** >>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch**** >>>> >>>> **** >>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch**** >>>> >>>> **** >>>> >>>> ** ** >>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch**** >>>> >>>> ** ** >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>>> >>> >> > --001a11c3b9441afe5904e3d81902 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Xavi,

    I agree to using keep-alive as on= e of UND methods. For this purpose, I think we should add some configuratio= n profile in the documents, something like your answers to my questions.

    Make sense?

    Qin=A0
    <= br>


    =A0


    On Wed, Aug 14, 2013 at 1:44 = AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Qin, see inline3D""


    Hi Xavi,

    I have two questions about the shared cells.

    = (1) Corresponding to a shared cell advertised in EB, what should the cell t= ype be set in the advertiser? Should be Rx?

    The cell type is defined = in a bitmap. The TX,RX and SHARED bits should be set.

    (2) Should it be required for all of the nodes in neighborhood = to be awake in the shared cells?

    Well, if cells are shared (slotted aloha), nodes wa= ke up, if they have something to transmit they transmit, if not, they liste= n. If there is nothing to be listened the slot becomes an idle listen slot,= which means that the radio is only on for the duration of the guard time.= =A0 If a packet arrives the node gets it. (in fact all listening nodes that= can hear the packet get it but the packet is discarded by all of them exce= pt the destination. This happens at the MAC layer as the destination addres= s does not match to the node's address)


    Basically, my concern is that when a k= eep-alive is sent out, the destination node is most likely in listening mod= e.

    Most likely is in= listening mode unless has something to transmit at that slot, then a colli= sion will happen.
    Is there something that you= don't like about that approach :-) ?

    X

    Thanks


    On Tue, Aug 13, 2013 at 10:32 AM, Qin Wang <qinwang@berkeley.edu>= ; wrote:
    Hi Xavi,

    I have two questions about the shared cells.

    (1) = Corresponding to a shared cell advertised in EB, what should the cell type = be set in the advertiser? Should be Rx?
    (2) Should it be required for all of the nodes in neighborhood to be a= wake in the shared cells?

    Basically, my concern is= that when a keep-alive is sent out, the destination node is most likely in= listening mode.=A0

    Thanks
    Qin


    On Wed, Aug 14, 2013 at 12:46 AM, Xavier Vilajosana Guill= en <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Pouria,
    I completely agree with your description. Besides, there isn= 9;t a common shared cell to send KAs. I see the operation in the following = way:
    6top KA timer expires and places a KA packet into the queue (e.g this= happens every 30s). TSCH layer at the begining of a shared tx/rx slot then= reads from the queue and sends the packet. This means that the KA can be s= end in any shared slot.

    does it make sense?
    X
    =


    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent for a while. But, in this basic RPL, we might use the = shared cell, as a temporary solution, to send the keep-alive to a particula= r neighbor. For sure, if the sender packet is not acknowledged (by the firs= t time), the sender can=92t find, if the transmission is collided or if the connection to the neighbor/paren= t is lost. In this case I think we need to retry several times based on TSC= H retransmission algorithm on those shared cells. If all the retries fails = then the connection to the neighbor/parent is lost.

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by= Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message pe= riodically to let the node to be recognized by its neighbor?<= /span>

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell.= And then, keep-alive has to use shared cell, which may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE8= 02.15.4e's normal operation, a node keeps synchronized with its RPL parent. In the absence of traffic, the node will= periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiti= ng NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
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    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch





    --001a11c3b9441afe5904e3d81902-- From P.Zand@utwente.nl Tue Aug 13 12:41:06 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8B0F911E81C5 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 12:41:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.503 X-Spam-Level: X-Spam-Status: No, score=-0.503 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id y6K2Gba2wOQ6 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 12:41:01 -0700 (PDT) Received: from EXEDGE01.ad.utwente.nl (exedge01.ad.utwente.nl [130.89.5.48]) by ietfa.amsl.com (Postfix) with ESMTP id 6D2E311E81C6 for <6tsch@ietf.org>; Tue, 13 Aug 2013 12:41:00 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE01.ad.utwente.nl (130.89.5.48) with Microsoft SMTP Server (TLS) id 14.2.328.9; Tue, 13 Aug 2013 21:40:59 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Tue, 13 Aug 2013 21:40:58 +0200 From: To: Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAA== Date: Tue, 13 Aug 2013 19:40:58 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDC@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDCEXMBX23adutwent_" MIME-Version: 1.0 Cc: watteyne@eecs.berkeley.edu, 6tsch@ietf.org, qinwang@berkeley.edu Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 19:41:06 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDCEXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDCEXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Xavi,

     <= /p>

    Keep Alive timer expires = for “node A” after 30s if no frames have been sent (or received= ) to (or from) neighbor “node B”. Am I right?=

     <= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors= that has already received their EB with acceptable RSSI? Or (2) the node should probe its connection with the its RPL parent and it= s RPL child? In the case (2), how does the 6top can inform the L3 about the= new potential discovered neighbors and their connection status?  &nbs= p; 

     <= /p>

    Pouria<= /p>

     <= /p>

     <= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,=

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the fol= lowing way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation using Neighbors information de= scribed in Basic configuration.

        -this includes how OF is calculated using numTx= and numTxACK, etc..

     

    []

    -RPL configuration:

         - storing mode vs non-storing mode (I vot= e for non-storing mode for a basic configuration)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDCEXMBX23adutwent_-- From xvilajosana@berkeley.edu Tue Aug 13 13:16:50 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DD67C21E818E for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 13:16:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.576 X-Spam-Level: X-Spam-Status: No, score=-2.576 tagged_above=-999 required=5 tests=[AWL=0.400, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u7pdY8Ak5q-1 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 13:16:46 -0700 (PDT) Received: from mail-pa0-f50.google.com (mail-pa0-f50.google.com [209.85.220.50]) by ietfa.amsl.com (Postfix) with ESMTP id 9140711E81B4 for <6tsch@ietf.org>; Tue, 13 Aug 2013 13:16:46 -0700 (PDT) Received: by mail-pa0-f50.google.com with SMTP id fb10so9235416pad.23 for <6tsch@ietf.org>; Tue, 13 Aug 2013 13:16:46 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=o53mtd9QBAULmhTrS2wUMLDFJbpd+WvJVe5H0SLgaO0=; b=KlC822NazI9ZqXAqcKEsZxEmgcdwCANELwY/IdqfBXomUP6WzQoRSi4SrEyfFBCbTS eTbJKR4n+6S8EV2ZGfy6N75hKTQn2D8U/UyEBRl7dLVEXlL500OsG+bXmjai+B5Vos2S juFyM0jHI+AcxWYZY37mC5LwC7tid+BqJC6z9WPa1nEWNNCtKIhojKTU1vJqNz4tc461 GG80uvr+q0ji+wojhZCxeHDYIcu72rfmsAc8zkLCBRmc65u+FmSZ6tTmEZNqJmc4YCVA 8cf7ZS8Ocdii4lm8TIkHcMt7BmgVYWRViWylSZn0zPTs01N1QWEZ7d2XwIY81y2/PYDt xZNA== X-Gm-Message-State: ALoCoQklv5Vru4vfrRfgA9MllCp5hFdkh0DYjpDm9+QCuh064jALUknlfruhEz/kNvxSKiuRgTLV MIME-Version: 1.0 X-Received: by 10.68.197.226 with SMTP id ix2mr6123822pbc.149.1376425006227; Tue, 13 Aug 2013 13:16:46 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Tue, 13 Aug 2013 13:16:46 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDC@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDC@EXMBX23.ad.utwente.nl> Date: Tue, 13 Aug 2013 13:16:46 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Pouria Zand Content-Type: multipart/alternative; boundary=e89a8ff1cc348e793104e3d9eb9d Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 20:16:51 -0000 --e89a8ff1cc348e793104e3d9eb9d Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pouria, answer inline: Xavi, Keep Alive timer expires for =93node A=94 after 30s if no frames have been = sent (or received) to (or from) neighbor =93node B=94. Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wants to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its RPL child? In the case (2), how does the 6top can inform the L3 about the new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn implementation), it is inserted at the neighbor table. At that point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information is updated (including rank). As we don't have any information about connectivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX and let RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors an eventually this information is used by RPL to update routes. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, wrote: > Xavi,**** > > ** ** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > ** ** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > ** ** > > Pouria**** > > ** ** > > ** ** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > ** ** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --e89a8ff1cc348e793104e3d9eb9d Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for =93node A=94 after 30s if no frames have been sent= =20 (or received) to (or from) neighbor =93node B=94. Am I right?

    there a= re many different ways to implement that, this is an option.

    =A0

    In 6top, (1) should not every node follow this scheme to probe its=20 connection with all the neighbors that has already received their EB=20 with acceptable RSSI?

    These are the list of known neighbors with accepta= ble RSSI, so yes if it wants to keep all of them.

    Or (2) the node should probe its connection with the its RPL parent and its RPL child? In the case (2), how does the 6top can inform the L3=20 about the new potential discovered neighbors and their connection=20 status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soo= n as a DIO is received from that node, its information is updated (includin= g rank). As we don't have any information about connectivity (as RFC655= 2 describes) an initial value is set (i.e rank + FOO). In openwsn a similar= case to (1) is used so eventually some stats of the link can be used to co= mpute the ETX and let RPL do its work.

    So RPL knows about a new node because 6TOP keeps information of = neighbors an eventually this information is used by RPL to update routes. A= s this node sends DIOs and receives DIOs from others the information is per= manently being updated enabling a node to be positioned in the multihop top= ology.

    Does it= make sense?

    Pouria=



    On Tue, A= ug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or= from) neighbor =93node B=94. Am I right?

    =A0<= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors= that has already received their EB with acceptable RSSI? Or (2) the node should probe its connection with the its RPL parent and it= s RPL child? In the case (2), how does the 6top can inform the L3 about the= new potential discovered neighbors and their connection status? =A0=A0=A0<= u>

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the= following way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.=

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchron= ized with its RPL parent. In the absence of traffic, the node will periodic= ally "keep alive" (per Xavi's e-mail) to the parent. How ofte= n depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    --e89a8ff1cc348e793104e3d9eb9d-- From P.Zand@utwente.nl Tue Aug 13 14:05:39 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B7E2A21E80EE for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 14:05:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.503 X-Spam-Level: X-Spam-Status: No, score=-0.503 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oQMHVToDtR+O for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 14:05:33 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 67E2B21E80DC for <6tsch@ietf.org>; Tue, 13 Aug 2013 14:05:32 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Tue, 13 Aug 2013 23:05:32 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Tue, 13 Aug 2013 23:05:30 +0200 From: To: Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWA= Date: Tue, 13 Aug 2013 21:05:29 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FD80@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDC@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FD80EXMBX23adutwent_" MIME-Version: 1.0 Cc: watteyne@eecs.berkeley.edu, 6tsch@ietf.org, qinwang@berkeley.edu Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 21:05:39 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FD80EXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FD80EXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Xavi,

     <= /p>

    Many thanks for your comp= lete explanation. It absolutely makes sense.

     <= /p>

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need t= o store rank information (included in DIO) in that table? Or we just store neighbor statistic?

     <= /p>

    Pouria

     <= /p>

     <= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,=

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?

    there are many different ways to implement that= , this is an option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acce= ptable RSSI, so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and = EB (at least in our openwsn implementation), it is inserted at the neighbor= table. At that point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its = information is updated (including rank). As we don't have any information a= bout connectivity (as RFC6552 describes) an initial value is set (i.e rank = + FOO). In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute= the ETX and let RPL do its work.

    So RPL knows about a new node because 6TOP keep= s information of neighbors an eventually this information is used by RPL to= update routes. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node t= o be positioned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your description. Besides, there isn't a c= ommon shared cell to send KAs. I see the operation in the following way:

    6top KA timer expires and places a KA packet into the queue (e.g this ha= ppens every 30s). TSCH layer at the begining of a shared tx/rx slot then re= ads from the queue and sends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation using Neighbors information de= scribed in Basic configuration.

        -this includes how OF is calculated using numTx= and numTxACK, etc..

     

    []

    -RPL configuration:

         - storing mode vs non-storing mode (I vot= e for non-storing mode for a basic configuration)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FD80EXMBX23adutwent_-- From xvilajosana@berkeley.edu Tue Aug 13 14:13:34 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8F3A121F9DF6 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 14:13:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.709 X-Spam-Level: X-Spam-Status: No, score=-2.709 tagged_above=-999 required=5 tests=[AWL=0.267, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GThGmYZnNGri for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 14:13:30 -0700 (PDT) Received: from mail-pb0-f50.google.com (mail-pb0-f50.google.com [209.85.160.50]) by ietfa.amsl.com (Postfix) with ESMTP id 143C521F9E22 for <6tsch@ietf.org>; Tue, 13 Aug 2013 14:13:30 -0700 (PDT) Received: by mail-pb0-f50.google.com with SMTP id uo5so8319468pbc.23 for <6tsch@ietf.org>; Tue, 13 Aug 2013 14:13:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=oZI4KP7gDdQQxE5bIgw3iiZ45OZxii/TORlukzOlplU=; b=lZtNCLg41Tu/NE576Lkxv27wGzKQ/y8GesVrSANGiNwEohg/U/rYZ6MCy3S0pQjjUA 1MRz9loyzGbtbJe1YQ3vJKMJGFlRvuaoa27XNJNcOcM1Xdc5vy0v+0koAhunEpIbBzeY odmY+KDPVE8GaXT3rh6jXewVMhOqpOmaBQ+G+wzp2X9gXCkY73CMAPK+LMZ4KhTo7iSX RSQCAnsWROoKx23kH/vyyL4j4t4JBxmFjYybqqX6q0DP3Z00w6cedDxThSX0qKxmh4iM b7e69palgwWColHK8RdccjbNlGDChJwhM3cf//iYPsWG8QxHSrtygWTgCrNpmcEW+S79 umCw== X-Gm-Message-State: ALoCoQnQgamkcRCgAodVZ5xto1EFeAyyZZEkaj2yHVlLC2ku7zWSSsd4w+TsJ8lHtigWyKZ7XvdF MIME-Version: 1.0 X-Received: by 10.68.2.69 with SMTP id 5mr6371778pbs.124.1376428409702; Tue, 13 Aug 2013 14:13:29 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Tue, 13 Aug 2013 14:13:29 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FD80@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDC@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FD80@EXMBX23.ad.utwente.nl> Date: Tue, 13 Aug 2013 14:13:29 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Pouria Zand Content-Type: multipart/alternative; boundary=bcaec52156bd6b564204e3dab6a0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 21:13:34 -0000 --bcaec52156bd6b564204e3dab6a0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of the table is something that we need to work on, stats for sure as described by the basic configuration draft. As regards to the rank, in our implementation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewhere else if you want but I guess we need it to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, wrote: > Xavi,**** > > ** ** > > Many thanks for your complete explanation. It absolutely makes sense.**** > > ** ** > > Just one minor question. The neighbor table will be stored in 6top. Am I > right? If yes, do we need to store rank information (included in DIO) in > that table? Or we just store neighbor statistic?**** > > ** ** > > Pouria **** > > ** ** > > ** ** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 10:17 PM > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Hi Pouria,**** > > answer inline:**** > > Xavi,**** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > there are many different ways to implement that, this is an option.**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI?**** > > These are the list of known neighbors with acceptable RSSI, so yes if it > wants to keep all of them.**** > > Or (2) the node should probe its connection with the its RPL parent and > its RPL child? In the case (2), how does the 6top can inform the L3 about > the new potential discovered neighbors and their connection status? **** > > When a node is discovered due to receiving and EB (at least in our openws= n > implementation), it is inserted at the neighbor table. At that point no > information about connectivity can be used except RSSI. As soon as a DIO = is > received from that node, its information is updated (including rank). As = we > don't have any information about connectivity (as RFC6552 describes) an > initial value is set (i.e rank + FOO). In openwsn a similar case to (1) i= s > used so eventually some stats of the link can be used to compute the ETX > and let RPL do its work. **** > > So RPL knows about a new node because 6TOP keeps information of neighbors > an eventually this information is used by RPL to update routes. As this > node sends DIOs and receives DIOs from others the information is > permanently being updated enabling a node to be positioned in the multiho= p > topology.**** > > Does it make sense?**** > > Pouria**** > > ** ** > > On Tue, Aug 13, 2013 at 12:40 PM, wrote:**** > > Xavi,**** > > **** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > **** > > Pouria**** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > **** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > ** ** > --bcaec52156bd6b564204e3dab6a0 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pouria,

    yes the neighbor table is some= thing that 6top takes care of. The fields of the table is something that we= need to work on, stats for sure as described by the basic configuration dr= aft. As regards to the rank, in our implementation, we keep it in the table= , for each neighbour we keep its rank. This information can be placed somew= here else if you want but I guess we need it to keep some sense on what is = the rank of our neighbors.

    regards,
    Xavi



    On Tue, Aug 13, 2013= at 2:05 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Many thanks for your comp= lete explanation. It absolutely makes sense.

    =A0<= /p>

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need t= o store rank information (included in DIO) in that table? Or we just store neighbor statistic?

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    answer inline:=

    Xavi,

    Keep Alive timer expires for =93node A=94 aft= er 30s if no frames have been sent (or received) to (or from) neighbor =93n= ode B=94. Am I right?

    there are many different ways to implement that, this is an= option.

    =A0

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its = information is updated (including rank). As we don't have any informati= on about connectivity (as RFC6552 describes) an initial value is set (i.e r= ank + FOO). In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute= the ETX and let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node t= o be positioned in the multihop topology.

    Does it make sense?

    Pouria

    =A0

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or from) neighbor =93node B=94. Am I right?

    =A0<= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status? =A0=A0=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the= following way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.=

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchron= ized with its RPL parent. In the absence of traffic, the node will periodic= ally "keep alive" (per Xavi's e-mail) to the parent. How ofte= n depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:<= u>

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    --bcaec52156bd6b564204e3dab6a0-- From P.Zand@utwente.nl Tue Aug 13 14:20:26 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1A28C21E816A for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 14:20:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.503 X-Spam-Level: X-Spam-Status: No, score=-0.503 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gpJ7naor9kqL for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 14:20:20 -0700 (PDT) Received: from EXEDGE01.ad.utwente.nl (exedge01.ad.utwente.nl [130.89.5.48]) by ietfa.amsl.com (Postfix) with ESMTP id 6BD0C21E80C3 for <6tsch@ietf.org>; Tue, 13 Aug 2013 14:20:15 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE01.ad.utwente.nl (130.89.5.48) with Microsoft SMTP Server (TLS) id 14.2.328.9; Tue, 13 Aug 2013 23:20:15 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Tue, 13 Aug 2013 23:20:14 +0200 From: To: Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWD//+R/gIAAIcgA Date: Tue, 13 Aug 2013 21:20:13 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FDCC@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDC@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FD80@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FDCCEXMBX23adutwent_" MIME-Version: 1.0 Cc: watteyne@eecs.berkeley.edu, 6tsch@ietf.org, qinwang@berkeley.edu Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 21:20:26 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FDCCEXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Xavi, I guess we cannot keep "node rank" in the 6top. Because a node might have d= ifferent rank based on different metrics defined in L3. As a response, I do= n't think we can get all of those information form L3 and use them in neigh= bor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FDCCEXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Xavi,

     <= /p>

    I guess we cannot keep &#= 8220;node rank” in the 6top. Because a node might have different rank= based on different metrics defined in L3. As a response, I don’t thi= nk we can get all of those information form L3 and use them in neighbor table= in 6top. Am I right?

    I think, as you mentioned= we need to work on them.

     <= /p>

    Pouria  <= /span>

     <= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Many thanks for your complete explanati= on. It absolutely makes sense.

     

    Just one minor question. The neighbor t= able will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?

    there are many different ways to implement that, this is an= option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about connect= ivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your description. Besides, there isn't a c= ommon shared cell to send KAs. I see the operation in the following way:

    6top KA timer expires and places a KA packet into the queue (e.g this ha= ppens every 30s). TSCH layer at the begining of a shared tx/rx slot then re= ads from the queue and sends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation using Neighbors information de= scribed in Basic configuration.

        -this includes how OF is calculated using numTx= and numTxACK, etc..

     

    []

    -RPL configuration:

         - storing mode vs non-storing mode (I vot= e for non-storing mode for a basic configuration)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     

    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FDCCEXMBX23adutwent_-- From xvilajosana@berkeley.edu Tue Aug 13 14:27:36 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EFF8421E8186 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 14:27:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.776 X-Spam-Level: X-Spam-Status: No, score=-2.776 tagged_above=-999 required=5 tests=[AWL=0.200, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id k+bfpZY3np5i for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 14:27:16 -0700 (PDT) Received: from mail-pa0-f49.google.com (mail-pa0-f49.google.com [209.85.220.49]) by ietfa.amsl.com (Postfix) with ESMTP id 88D9021E8187 for <6tsch@ietf.org>; Tue, 13 Aug 2013 14:27:14 -0700 (PDT) Received: by mail-pa0-f49.google.com with SMTP id ld10so4815055pab.36 for <6tsch@ietf.org>; Tue, 13 Aug 2013 14:27:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=jLA+eqcDPtvEvt42CeyiqNOVOr0cmBRSGDrTC+mQaJo=; b=SFWgwhqiLsSwa36WPDk8cVhMce0UGLxUu/OAd98oardAKg4odQyPJpdTqW40mHaLfj NPpGO+3gQ0GJefO3A5PXq85dw1QTRY7iOs4Yhm4loyiFQh06WqPCb3A8XDOB7xoRrnxo 1kXdLeksVr7tY4AtgyTkicVgVc77+kxr4qrYU6TbthZYFCEK5qnZoVb2hufcHodY3EOd i7u+XaI/iia3CPDMg8+5LvPfMQ1wdbNOkV9xxXYPnDrCPuZA05E2PnRvU58mXpRAhcZQ sAchcmV16Q+tpSKS/CuLAT/kQDKCbS+psZzHNJhDo75THvg6MsI3hiMH1R4KGqOQ7Jsm xBeA== X-Gm-Message-State: ALoCoQnI1wP2Z+459WWWxnse3KWxm/FRRnFsEvHKNonYfhXWadxoHRT0aNzvchUbSj9u5jBasjMl MIME-Version: 1.0 X-Received: by 10.68.104.101 with SMTP id gd5mr6420597pbb.132.1376429234049; Tue, 13 Aug 2013 14:27:14 -0700 (PDT) Received: by 10.70.85.102 with HTTP; Tue, 13 Aug 2013 14:27:13 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FDCC@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FA79@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FCDC@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FD80@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA6FDCC@EXMBX23.ad.utwente.nl> Date: Tue, 13 Aug 2013 14:27:13 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Pouria Zand Content-Type: multipart/alternative; boundary=047d7b675f508defb804e3dae7a6 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 21:27:37 -0000 --047d7b675f508defb804e3dae7a6 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, wrote: > Xavi,**** > > ** ** > > I guess we cannot keep =93node rank=94 in the 6top. Because a node might = have > different rank based on different metrics defined in L3. As a response, I > don=92t think we can get all of those information form L3 and use them in > neighbor table in 6top. Am I right? **** > > I think, as you mentioned we need to work on them. **** > > ** ** > > Pouria **** > > ** ** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 11:13 PM > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Hi Pouria, > > yes the neighbor table is something that 6top takes care of. The fields o= f > the table is something that we need to work on, stats for sure as describ= ed > by the basic configuration draft. As regards to the rank, in our > implementation, we keep it in the table, for each neighbour we keep its > rank. This information can be placed somewhere else if you want but I gue= ss > we need it to keep some sense on what is the rank of our neighbors.**** > > regards,**** > > Xavi**** > > ** ** > > ** ** > > On Tue, Aug 13, 2013 at 2:05 PM, wrote:**** > > Xavi,**** > > **** > > Many thanks for your complete explanation. It absolutely makes sense.**** > > **** > > Just one minor question. The neighbor table will be stored in 6top. Am I > right? If yes, do we need to store rank information (included in DIO) in > that table? Or we just store neighbor statistic?**** > > **** > > Pouria **** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 10:17 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > answer inline:**** > > Xavi,**** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > there are many different ways to implement that, this is an option.**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI?**** > > These are the list of known neighbors with acceptable RSSI, so yes if it > wants to keep all of them.**** > > Or (2) the node should probe its connection with the its RPL parent and > its RPL child? In the case (2), how does the 6top can inform the L3 about > the new potential discovered neighbors and their connection status? **** > > When a node is discovered due to receiving and EB (at least in our openws= n > implementation), it is inserted at the neighbor table. At that point no > information about connectivity can be used except RSSI. As soon as a DIO = is > received from that node, its information is updated (including rank). As = we > don't have any information about connectivity (as RFC6552 describes) an > initial value is set (i.e rank + FOO). In openwsn a similar case to (1) i= s > used so eventually some stats of the link can be used to compute the ETX > and let RPL do its work. **** > > So RPL knows about a new node because 6TOP keeps information of neighbors > an eventually this information is used by RPL to update routes. As this > node sends DIOs and receives DIOs from others the information is > permanently being updated enabling a node to be positioned in the multiho= p > topology.**** > > Does it make sense?**** > > Pouria**** > > **** > > On Tue, Aug 13, 2013 at 12:40 PM, wrote:**** > > Xavi,**** > > **** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > **** > > Pouria**** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > **** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > ** ** > --047d7b675f508defb804e3dae7a6 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Good point :-)

    agreed!
    X


    On Tue, Aug 13, = 2013 at 2:20 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    I guess we cannot keep = =93node rank=94 in the 6top. Because a node might have different rank based= on different metrics defined in L3. As a response, I don=92t think we can get all of those information form L3 and use them in neighbor table= in 6top. Am I right?

    I think, as you mentioned= we need to work on them.

    =A0<= /p>

    Pouria =A0<= /span>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

    =A0

    =A0

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:=

    Xavi,

    =A0<= /p>

    Many thanks for your comp= lete explanation. It absolutely makes sense.

    =A0<= /p>

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    answer inline:=

    Xavi,

    Keep Alive timer expires for =93node A=94 aft= er 30s if no frames have been sent (or received) to (or from) neighbor =93n= ode B=94. Am I right?

    there are many different ways to implement that, this is an= option.

    =A0

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about con= nectivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

    =A0

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or from) neighbor =93node B=94. Am I right?

    =A0<= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status? =A0=A0=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the= following way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.=

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchron= ized with its RPL parent. In the absence of traffic, the node will periodic= ally "keep alive" (per Xavi's e-mail) to the parent. How ofte= n depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:<= u>

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

    =A0=A0=A0 -this includes how OF is calculated using = numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing mode vs non-storing mode (I v= ote for non-storing mode for a basic configuration)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    --047d7b675f508defb804e3dae7a6-- From rsudhaak@cisco.com Tue Aug 13 15:57:31 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2989411E80D2 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 15:57:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7E3OeUAu3ayO for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 15:57:04 -0700 (PDT) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id D260F21F9B12 for <6tsch@ietf.org>; Tue, 13 Aug 2013 15:57:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=43968; q=dns/txt; s=iport; t=1376434620; x=1377644220; h=from:to:cc:subject:date:message-id:in-reply-to: mime-version; bh=hco02cqevF3CQXECl2SUjeM/77CF6lM0v1dpoOM5D9M=; b=VJQKtM5vBIypLCturpRmn48TOvhzpKFEfTet2qpAKKF1/hOCpsrPF2w/ TJsJMIVJjpdXtqB70vMZt+hWfVoBDtOB73xU6kCa3oihRkLdhiS7hltCb QcYPhLq5sjFcx1OEpcTTDTzJGuS895O5KSGu3mbN3aYzmCOkgEdrsg3XE M=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ag4FAFK5ClKtJV2a/2dsb2JhbABbDoI0RDVQvmKBJBZ0giQBAQEEAQEBFw1HCxIBCBEBAgEBAQsWAQYuCxQDBggCBAENBQgTh3UMuDEEjmkWgQwGGg0EBgECBIMVdgOFR45GlSiCXT6BaAcCFwQe X-IronPort-AV: E=Sophos;i="4.89,873,1367971200"; d="scan'208,217";a="246775815" Received: from rcdn-core-3.cisco.com ([173.37.93.154]) by rcdn-iport-1.cisco.com with ESMTP; 13 Aug 2013 22:56:59 +0000 Received: from xhc-aln-x12.cisco.com (xhc-aln-x12.cisco.com [173.36.12.86]) by rcdn-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id r7DMuxMH003962 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 13 Aug 2013 22:56:59 GMT Received: from xmb-rcd-x04.cisco.com ([169.254.8.180]) by xhc-aln-x12.cisco.com ([173.36.12.86]) with mapi id 14.02.0318.004; Tue, 13 Aug 2013 17:56:59 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: "xvilajosana@eecs.berkeley.edu" , "Pouria Zand" Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOmHhphUG5l50ScE27Ax5NhC9gtg== Date: Tue, 13 Aug 2013 22:56:58 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.154.175.18] Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60Bxmbrcdx04ciscoc_" MIME-Version: 1.0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 22:57:31 -0000 --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60Bxmbrcdx04ciscoc_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Xavi, Pouria, I think we need to keep node rank at 6top (as a read only parameter obtaine= d from L3) in order for the TSCH nodes to figure out the timing parent. In = the case where RPL node may have different ranks based on different OFs we = need a method to pick a timing parent. We should propose a default OF, that is used to compute the ranks for the p= urpose finding the timing parent. -raghuram From: Xavier Vilajosana Guillen > Reply-To: > Date: Tuesday, August 13, 2013 2:27 PM To: Pouria Zand > Cc: Thomas Watteyne >, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang = > Subject: Re: [6tsch] RPL on Basic Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, > wrote: Xavi, I guess we cannot keep =93node rank=94 in the 6top. Because a node might ha= ve different rank based on different metrics defined in L3. As a response, = I don=92t think we can get all of those information form L3 and use them in= neighbor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for =93node A=94 after 30s if no frames have been = sent (or received) to (or from) neighbor =93node B=94. Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for =93node A=94 after 30s if no frames have been = sent (or received) to (or from) neighbor =93node B=94. Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can=92t find, if the transmission is collided or = if the connection to the neighbor/parent is lost. In this case I think we n= eed to retry several times based on TSCH retransmission algorithm on those = shared cells. If all the retries fails then the connection to the neighbor/= parent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we=92ll have (or not) EBs, and that we will (or not) time sync= from the RPL parent, there is probably something we can recommend, and lim= itations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It=92s st= ill good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I=92d seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60Bxmbrcdx04ciscoc_ Content-Type: text/html; charset="Windows-1252" Content-ID: <099303C524FE664FB0BD658C20ECC88B@emea.cisco.com> Content-Transfer-Encoding: quoted-printable
    Xavi, Pouria,
    I think we need to keep node rank at 6top (as a read only parameter ob= tained from L3) in order for the TSCH nodes to figure out the timing parent= . In the case where RPL node may have different ranks based on different OF= s we need a method to pick a timing parent.

    We should propose a default OF, that is used to compute the ranks for = the purpose finding the timing parent.

    -raghuram

    From: Xavier Vilajosana Guillen <= ;xvilajosana@eecs.berkeley= .edu>
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27= PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, &quo= t;6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qinwang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

    Good point :-)

    agreed!
    X


    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwent= e.nl> wrote:

    Xavi,

     

    I guess we cannot keep =93node ran= k=94 in the 6top. Because a node might have different rank based on differe= nt metrics defined in L3. As a response, I don=92t think we can get all of those information form L3 and use them i= n neighbor table in 6top. Am I right?

    I think, as you mentioned we need = to work on them.

     

    Pouria  =

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berke= ley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     <= /p>

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:=

    Xavi,

     

    Many thanks for your complete expl= anation. It absolutely makes sense.

     

    Just one minor question. The neigh= bor table will be stored in 6top. Am I right? If yes, do we need to store r= ank information (included in DIO) in that table? Or we just store neighbor statistic?

     

    Pouria

     

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berke= ley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,<= /u>

    answer inline:=

    Xavi,

    Keep Alive timer expires for =93node A=94 after 30s if= no frames have been sent (or received) to (or from) neighbor =93node B=94.= Am I right?

    ther= e are many different ways to implement that, this is an option.

     

    In 6top, (1) should not every node follow this scheme = to probe its connection with all the neighbors that has already received th= eir EB with acceptable RSSI?

    Thes= e are the list of known neighbors with acceptable RSSI, so yes if it wants = to keep all of them.

    Or (2) the node should probe its connection with the i= ts RPL parent and its RPL child? In the case (2), how does the 6top can inf= orm the L3 about the new potential discovered neighbors and their connection status?

    When= a node is discovered due to receiving and EB (at least in our openwsn impl= ementation), it is inserted at the neighbor table. At that point no informa= tion about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about connect= ivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So R= PL knows about a new node because 6TOP keeps information of neighbors an ev= entually this information is used by RPL to update routes. As this node sen= ds DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does= it make sense?

    Pouria

     <= /p>

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for =93no= de A=94 after 30s if no frames have been sent (or received) to (or from) ne= ighbor =93node B=94. Am I right?

     

    In 6top, (1) should not every node= follow this scheme to probe its connection with all the neighbors that has= already received their EB with acceptable RSSI? Or (2) the node should probe its connection with the its RPL parent = and its RPL child? In the case (2), how does the 6top can inform the L3 abo= ut the new potential discovered neighbors and their connection status? &nbs= p;  

     

    Pouria

     

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berke= ley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the fol= lowing way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     <= /p>

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,

    I agree that Keep-alive message ne= ed to be sent in the dedicated cell to the potential neighbor/parent, whene= ver the sender has not received any packet from its neighbor/parent for a while. But, in this basic RPL, we mi= ght use the shared cell, as a temporary solution, to send the keep-alive to= a particular neighbor. For sure, if the sender packet is not acknowledged = (by the first time), the sender can=92t find, if the transmission is collided or if the connection to the = neighbor/parent is lost. In this case I think we need to retry several time= s based on TSCH retransmission algorithm on those shared cells. If all the = retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to sen= d the keep-alive message so often, therefore the traffic caused by Keep-ali= ve is not too much.

    Am I right?

    BTW, do we have any common shared = cell (in the whole network) to broadcast the Keep-alive message periodicall= y to let the node to be recognized by its neighbor?

     

    Best wishes,<= /p>

    Pouria

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell.= And then, keep-alive has to use shared cell, which may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     <= /p>

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coincide= s with its TSCH time source neighbor. As a result, and as part of IEEE802.1= 5.4e's normal operation, a node keeps synchronized with its RPL parent. In the absence of traffic, the node will= periodically "keep alive" (per Xavi's e-mail) to the parent. How= often depends on a number of factors, including crystal drift and guard ti= me, but in a typical case, a node will realize its routing parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiti= ng NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive kee= p alive. Proactive heart beat that comes at a periodic battery drain. Quest= ion is what is the optimal way with TSCH for a child to find that the parent is gone, in the absence of traffi= c?

    Knowing that we=92ll have (or not)= EBs, and that we will (or not) time sync from the RPL parent, there is pro= bably something we can recommend, and limitations to the granularity that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berke= ley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. How do we = know a peer is gone missing? Only reactive to traffic has issues like a chi= ld may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How = can MAC mechanisms help?

    Keep alive packets help on that. :-)

    X

     <= /p>

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation using Neighbors = information described in Basic configuration.

        -this includes how OF is calculat= ed using numTx and numTxACK, etc..

     

    []

    -RPL configuration:

         - storing mode vs non-stori= ng mode (I vote for non-storing mode for a basic configuration)

     

    [] I would MUST the non-storing and MAY the s= toring mode support. It=92s still good t enable storing mode interop for la= rger devices.

     

         - DIO period. Whether we us= e trickle algorithm (and we define the initial period) or we use a fix peri= od for DIO (no trickle) for basic configuration.

       &nb= sp;  -DAO period, idem.

    I=92d seek for a recommendation from Phil = on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    We need to discuss NUD as well. How do we = know a peer is gone missing? Only reactive to traffic has issues like a chi= ld may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How = can MAC mechanisms help?

    Som= e of that discussion may be spread between other drafts like the architectu= re.

    &nb= sp;

    Che= ers;

    &nb= sp;

    Pas= cal

    &nb= sp;

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


     --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60Bxmbrcdx04ciscoc_-- From twatteyne@gmail.com Tue Aug 13 16:05:08 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C052A21F935A for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 16:05:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.977 X-Spam-Level: X-Spam-Status: No, score=-1.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id T2imZ2evakdP for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 16:05:08 -0700 (PDT) Received: from mail-pb0-x234.google.com (mail-pb0-x234.google.com [IPv6:2607:f8b0:400e:c01::234]) by ietfa.amsl.com (Postfix) with ESMTP id D72C811E80D7 for <6tsch@ietf.org>; Tue, 13 Aug 2013 16:05:07 -0700 (PDT) Received: by mail-pb0-f52.google.com with SMTP id wz12so8405964pbc.39 for <6tsch@ietf.org>; Tue, 13 Aug 2013 16:05:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=NrikYEDXk/IR1eKGn0oBTjKHWwFZDYUZ4FL6mGtllG8=; b=STLGKmjiRInaydxx7e4yh032EOLc6nK1mGaHcT5VGiPme43CQdIBIsb1PK+1RUimY8 GVjr6trIpaOMGcCN9ZNhpjPQhJEP9Zr61j/89A2yRH5EhHDVhGMethNdllNwOa/r6yin YoIt9RC5uqeWCLr1/luh0Oni2OdJFtsL3M8mJua0FAYhWjtNRkUlGLMJrSrcAIlysp9n JAWclE8KJlp+1joHtiUliZGOLSfBe7GnFYzADwZblIlu/ZaMf5fjcGA6PP8qS/yuCTax Xz+pGz6eSFlw7eaLqBGeDmZgF5J0MZVbjWiA2Y0AS4aWqtD7C2UZorsfQBJYBPuukCli /QNg== X-Received: by 10.68.59.98 with SMTP id y2mr6679120pbq.135.1376435107469; Tue, 13 Aug 2013 16:05:07 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 13 Aug 2013 16:04:47 -0700 (PDT) From: Thomas Watteyne Date: Tue, 13 Aug 2013 16:04:47 -0700 X-Google-Sender-Auth: 1_zYwZVLV6mWVpyX67Uqsq_X2h4 Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=bcaec5304f81a3244004e3dc456a Subject: [6tsch] [IMPORTANT] issues with the name 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Aug 2013 23:05:08 -0000 --bcaec5304f81a3244004e3dc456a Content-Type: text/plain; charset=ISO-8859-1 All, We had a vote in February on in the ML to pick a name, and the group chose "6TSCH" because (1) 6 appears early in the alphabet and (2) TSCH clearly identifies the TSCH mode of IEEE802.15.4e. Concerns about this acronym were raised in Berlin, first about pronunciation difficulties, then about a potential naming collision. While initially people proposed some alternative names, during last week, the ML leaned toward keeping the name 6TSCH. We discussed this on the call last Friday, and ended with a rough consensus. Pascal and myself then spent a couple of days discussing this with several people at the IETF. The conclusion is that this potential naming collision is not taken lightly by the IETF. The possibility that a name might be interpreted as offensive, in particular when pronounced as "6-tush", is something we absolutely want to avoid, in particular in the light of the recent PyCon fiasco. The group is therefore asked to pick a different name. Having been part of the selection of the name "6TSCH", I know that we had no idea "6TSCH" could be mis-pronounced. I also understand that we have advertised and used the name "6TSCH" for the last couple of months, and that we got attached to it. Yet, if there is a chance of misinterpretation, we should change it now rather than later. This means that we get to pick another name. We are looking for a name that can be read and pronounced easily and unambiguously regardless of the native language. The following names were discussed: - sixtus (IPv6 over Time-Slotted Channel Hopping) - 6TiSCH (IPv6 over Time-Slotted Channel Hopping) - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) - 6TiC (IPv6 over Time-slotted Channel hopping ) - 6TiS (Time slotted Synchronized) - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) - WiNOT (Wireless Networks for Operational Technology) I opened a poll at http://www.surveymonkey.com/s/SJDXKQF. Please take minute to respond with your ordered preference so we can conduct a Condorcet vote http://en.wikipedia.org/wiki/Condorcet_method; in case of ambiguity, we'll use ranked pair and the winner will be announced during the next call. Pascal & Thomas --bcaec5304f81a3244004e3dc456a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    We had a vote in Februa= ry on in the ML to pick a name, and the group chose "6TSCH" becau= se (1) 6 appears early in the alphabet and (2) TSCH clearly identifies the = TSCH mode of IEEE802.15.4e.=A0

    Concerns about this acronym were raised in Berlin, firs= t about pronunciation difficulties, then about a potential naming collision= . While initially people proposed some alternative names, during last week,= the ML leaned toward keeping the name 6TSCH. We discussed this on the call= last Friday, and ended with a rough consensus. Pascal and myself then spen= t a couple of days discussing this with several people at the IETF.

    The conclusion is that this potential naming collision = is not taken lightly by the IETF. The possibility that a name might be inte= rpreted as offensive, in particular when pronounced as "6-tush", = is something we absolutely want to avoid, in particular in the light of the= recent PyCon fiasco. The group is therefore asked to pick a different name= .

    Having been part of the selection of the name "6TS= CH", I know that we had no idea "6TSCH" could be mis-pronoun= ced. I also understand that we have advertised and used the name "6TSC= H" for the last couple of months, and that we got attached to it. Yet,= if there is a chance of misinterpretation, we should change it now rather = than later.

    This means that we get to pick another name. We are loo= king for a name that can be read and pronounced easily and unambiguously re= gardless of the native language. The following names were discussed:
    - sixtus (IPv6 over Time-Slotted Channel Hopping)
    - 6TiSCH (= IPv6 over Time-Slotted Channel Hopping)
    - 6TiCS (IPv6 over Time-s= lotted Channel hopping Slots)
    - 6TiC (IPv6 over Time-slotted Chan= nel hopping )
    - 6TiS (Time slotted Synchronized)
    - 6chants (IPv6 over Chan= nel Hopping ANd Time Sliced links)
    - WiNOT (Wireless Networks for= Operational Technology)


    Please take minute to respond with your ordered prefere= nce so we can conduct a Condorcet vote http://en.wikipedia.org/wiki/Condorcet_method; in= case of ambiguity, we'll use ranked pair and the winner will be announ= ced during the next call.

    Pascal & Thomas
    --bcaec5304f81a3244004e3dc456a-- From qinwang@berkeley.edu Tue Aug 13 17:14:57 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4B79A21F9B7F for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 17:14:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.876 X-Spam-Level: X-Spam-Status: No, score=-2.876 tagged_above=-999 required=5 tests=[AWL=0.100, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ShGL8vnmhHVv for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 17:14:53 -0700 (PDT) Received: from mail-vc0-f173.google.com (mail-vc0-f173.google.com [209.85.220.173]) by ietfa.amsl.com (Postfix) with ESMTP id 1F86121F99A1 for <6tsch@ietf.org>; Tue, 13 Aug 2013 17:14:41 -0700 (PDT) Received: by mail-vc0-f173.google.com with SMTP id id13so4558757vcb.32 for <6tsch@ietf.org>; Tue, 13 Aug 2013 17:14:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=avN5ay0i7wxE9bKiKy9H8Ezc0vjZUXy1crk7N61gRHY=; b=DdvFFDscBx1fp+j2CcVxqLwLjs73r9cdSqdVF3tV2Mvw8R9w6r1n/B3MQ4GK7nB795 5h8gQW4kY8SlaFkcrO5BpyszIgTl7WE4I+WF5xbH0L8zi47gEE4KfXb88Qa8xoUAl7qJ e4Fx+PP9NKR5RnOMRFrjs3KulMhuAjIkaH8gS/PVpVyZgAtJW/9TWml8ghzN9yXW2mg3 rJVBxpYrKebHTmtFoqRdwgdtfYQHmqcMexWkyqAH03r54cv0W8XJEE+ryAoxQnevqWex L+MFGJ63xZolzB7hqPO7yvfBeQ1r0ZFuJ3ch8W45+QjRGicA0WT86n/RUGwCWQCfnju6 OdCg== X-Gm-Message-State: ALoCoQloClXvYi59STCEhrAbyCZkc4voWXDLYedQWStEOozKFDPbfiJotR1PktPFFmc3W1a5qd5E MIME-Version: 1.0 X-Received: by 10.52.180.229 with SMTP id dr5mr5548820vdc.20.1376439278083; Tue, 13 Aug 2013 17:14:38 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Tue, 13 Aug 2013 17:14:38 -0700 (PDT) In-Reply-To: References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958D@xmb-rcd-x04.cisco.com> Date: Wed, 14 Aug 2013 08:14:38 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=bcaec51969cf39d5f004e3dd3ee4 Cc: 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Aug 2013 00:14:57 -0000 --bcaec51969cf39d5f004e3dd3ee4 Content-Type: text/plain; charset=ISO-8859-1 Hi All, I'm trying to apply BSON to express data type encountered in 6top and 802.15.4e. I'm not sure if ASN will be included in some management messages or not. But, if needed, how to express uint40 (5bytes integer) with BSON? Thanks Qin On Tue, Aug 13, 2013 at 3:03 PM, Thomas Watteyne wrote: > +1. > > Please note that the goal of item 1 is to define the format of the > payload, not per se the transport method. > > Thomas > > > On Mon, Aug 12, 2013 at 2:38 PM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote: > >> Hi Qin, >> >> this sounds correct to me. >> X >> >> >> On Mon, Aug 12, 2013 at 2:23 PM, Qin Wang wrote: >> >>> Hi Xavi and Raghuram, >>> >>> Now I can see the advantage of BSON. >>> >>> Regarding to the scope of "Timeslot Management Methods and Formats", and >>> the relationship between task item-1 and item-2, now my understanding is as >>> follows. >>> >>> (1) item-2 is about 6top. In the first step, it is a subset of 6top, >>> only includes the commands and packets/IEs used for static case, i.e. >>> Enhanced Beacon based schedule establishment. It still use custom format >>> and 15.4e IE to carry. >>> >>> (2) item-1 is about the management messages carried by upper layer >>> protocols like CoAP to use 6top. It is still a open issue to use BSON or >>> custom format to define the management messages. >>> >>> Correct? >>> >>> Thanks >>> Qin >>> >>> >>> >>> >>> >>> >>> >>> >>> On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) < >>> rsudhaak@cisco.com> wrote: >>> >>>> Qin, >>>> There is an advantage of using BSON over regular JSON for the purpose >>>> of transporting schedule information. Most of this info is bitmaps, and >>>> BSON capability to handle binary payload will be efficient compared to >>>> regular JSON. If we define the formats as regular BSON as opposed to custom >>>> formats, the implementation of 6top in various languages will also be >>>> easier as BSON libraries are readily available. >>>> >>>> From: Xavier Vilajosana Guillen >>>> Reply-To: >>>> Date: Monday, August 12, 2013 11:02 AM >>>> To: Qin Wang >>>> Cc: "6tsch@ietf.org" <6tsch@ietf.org> >>>> Subject: Re: [6tsch] about format >>>> >>>> Hi Qin, >>>> >>>> I think that the work item aims to define the packet format of the >>>> messages that will transport the schedule information, this is on top of >>>> 6top. 6top has the API to handle that information and use its own messages >>>> (using its IEs) to install the schedule in both sides of a link (if there >>>> is connectivity between the two nodes). >>>> >>>> X >>>> >>>> >>>> On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang wrote: >>>> >>>>> Xavi, >>>>> >>>>> It make more sense to use BSON in higher layer message definition. >>>>> >>>>> But if so, why it should be included in the document "Timeslot >>>>> management methods and format" ? My understanding is the document is about >>>>> 6top, so the format in the document refers to the format of 6top packets. >>>>> Please point out where I'm wrong. >>>>> >>>>> Thanks >>>>> Qin >>>>> >>>>> >>>>> On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosana Guillen < >>>>> xvilajosana@eecs.berkeley.edu> wrote: >>>>> >>>>>> Hi Qin, >>>>>> >>>>>> my feeling is that BSON will go in the packet from the PCE to the >>>>>> mote that has to be scheduled. This is a higher layer issue and relates to >>>>>> the payload of a CoAP packet sent from the PCE to the mote (and viceversa). >>>>>> I don't think that 6top needs BSON as an encoding for the IEs. >>>>>> >>>>>> does it make sense? >>>>>> X >>>>>> >>>>>> >>>>>> On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang wrote: >>>>>> >>>>>>> Hi Pascal, >>>>>>> >>>>>>> During the teleconference on last Friday, you mentioned that we >>>>>>> will investigate Binary JSON to define the message formats. I'm not very >>>>>>> clear about what is the relationship between the Binary JSON coding and >>>>>>> 802.15.4e Information Element. I guess that we will still use IEs to carry >>>>>>> the 6top messages, but for those IE coding, we will use Binary JSON. >>>>>>> Correct? >>>>>>> >>>>>>> By the way, what is the advantage to use Binary JSON format? What >>>>>>> are your main considerations? >>>>>>> >>>>>>> Thanks >>>>>>> Qin >>>>>>> >>>>>>> _______________________________________________ >>>>>>> 6tsch mailing list >>>>>>> 6tsch@ietf.org >>>>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --bcaec51969cf39d5f004e3dd3ee4 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi All,

    I'm trying to apply BSON to= express data type encountered in 6top and =A0802.15.4e. I'm not sure i= f ASN will be included in some management messages or not. But, if needed, = how to express uint40 (5bytes integer) with BSON?

    Thanks
    Qin



    On Tue, Aug 13, 2013 = at 3:03 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wrote:
    +1.

    Plea= se note that the goal of item 1 is to define the format of the payload, not= per se the transport method.

    Thomas


    On Mon, Aug 12, 2013 at 2:38 PM, Xavier Vila= josana Guillen <xvilajosana@eecs.berkeley.edu> w= rote:
    Hi Qin,

    t= his sounds correct to me.
    X


    On Mon, Aug 12, 2013 at 2:23 PM, Qin Wang <qinwang@ber= keley.edu> wrote:
    Hi Xavi and Raghuram,
    <= br>
    Now I can see the advantage of BSON.

    Regarding to the scope of=A0"Timeslot Management Methods and Formats&q= uot;, and the relationship between task item-1 and item-2, now my understan= ding is as follows.

    (1) item-2 is about 6top. In the first step, it is a su= bset of 6top, only includes the commands and packets/IEs used for static ca= se, i.e. Enhanced Beacon based schedule establishment. It still use custom = format and 15.4e IE to carry.

    (2) item-1 is about the management messages carried by = upper layer protocols like CoAP to use 6top. It is still a open issue to us= e BSON or custom format to define the management messages.

    Correct?

    Thanks
    Qin








    On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@= cisco.com> wrote:
    Qin,
    There is an advantage of using BSON over regular JSON for the purpose = of transporting schedule information. Most of this info is bitmaps, and BSO= N capability to handle binary payload will be efficient compared to regular= JSON. If we define the formats as regular BSON as opposed to custom formats, the implementation of 6top i= n various languages will also be easier as BSON libraries are readily avail= able.

    From: Xavier Vilajosana Guillen <= ;xvilajo= sana@eecs.berkeley.edu>
    Reply-To: <xvilajosana@eecs.berkeley.edu= >
    Date: Monday, August 12, 2013 11:02= AM
    To: Qin Wang <qinwang@berkeley.edu>
    Cc: "6tsch@ietf.org" <6tsch@ietf.org>
    Subject: Re: [6tsch] about format

    Hi Qin,

    I think that the work item aims to define the packet format of the messages= that will transport the schedule information, this is on top of 6top. 6top= has the API to handle that information and use its own messages (using its= IEs) to install the schedule in both sides of a link (if there is connectivity between the two nodes).

    X


    On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang <qinwang@berke= ley.edu> wrote:
    Xavi,

    It make more sense to use BSON in higher layer message definition.=A0<= /div>

    But if so, why it should be included in the document "Timeslot ma= nagement methods and format" ? My understanding is the document is abo= ut 6top, so the format in the document refers to the format of 6top packets= . Please point out where I'm wrong.

    Thanks
    Qin


    On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Qin,

    my feeling is that BSON will go in the packet from the PCE to the mote that= has to be scheduled. This is a higher layer issue and relates to the paylo= ad of a CoAP packet sent from the PCE to the mote (and viceversa). I don= 9;t think that 6top needs BSON as an encoding for the IEs.

    does it make sense?
    X


    On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Pascal,

    During the teleconference on last Friday, you mentioned that we will i= nvestigate Binary JSON to define the message formats. I'm not very clea= r about what is the relationship between the Binary JSON coding and 802.15.= 4e Information Element. I guess that we will still use IEs to carry the 6top messages, but for those IE coding,= we will use Binary JSON. Correct?

    By the way, what is the advantage to use Binary JSON format? What are = your main considerations?

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --bcaec51969cf39d5f004e3dd3ee4-- From salo@saloits.com Tue Aug 13 17:25:22 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 02A7A21F9DBE for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 17:25:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iK2ptTJHG76f for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 17:25:16 -0700 (PDT) Received: from mail.saloits.com (saloits.com [208.42.140.127]) by ietfa.amsl.com (Postfix) with ESMTP id CB7F521F9C13 for <6tsch@ietf.org>; Tue, 13 Aug 2013 17:25:15 -0700 (PDT) Received: from [134.84.155.43] (x-134-84-155-43.uofm-secure.wireless.umn.edu [134.84.155.43]) by mail.saloits.com (8.14.4/8.14.3) with ESMTP id r7E0PDJb028169; Tue, 13 Aug 2013 19:25:13 -0500 Message-ID: <520ACE65.8080604@saloits.com> Date: Tue, 13 Aug 2013 19:25:09 -0500 From: "Timothy J. Salo" User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 MIME-Version: 1.0 To: 6TSCH <6tsch@ietf.org> References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [6tsch] [IMPORTANT] issues with the name 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Aug 2013 00:25:22 -0000 A few comments on names: > TSCH clearly identifies the TSCH mode of IEEE802.15.4e. This is the IETF. I don't think that "TSCH" currently has much meaning beyond the handful of people on this list and a few other people in the standards community. I think our name ought to speak to a wider audience OK, maybe "TSCH" is marginally useful for search engine optimization (i.e., helping people who Google "TSCH" find the working group). But, I don't think that is a very good motivation. > - sixtus (IPv6 over Time-Slotted Channel Hopping) > - 6TiSCH (IPv6 over Time-Slotted Channel Hopping) > - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) > - 6TiC (IPv6 over Time-slotted Channel hopping ) > - 6TiS (Time slotted Synchronized) I would call this 6TiS (IPv6 over Time-Slotted [MAC] protocols). The "Synchronized" seems superfluous to me, but perhaps I'm missing something. I would also like to see working group give a bit of consideration to non-channel-hopping time-slotted protocols. My particular interest is narrowband very high frequency (VHF) and ultra-high frequency (UHF) RF channels, where a time-slotted MAC protocol is potentially beneficial, but where channel hopping usually isn't an option. No, I don't think that non-channel-hopping time-slotted protocols ought to be a current work item at this point, but it would be nice if the protocols developed by the working group could easily be extended to single-channel operation (or may two-channel operation, where the access point transmits on one channel and receives on another channel). > - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) Operating systems already use "time sliced"; I think we want to use the term "time slotted". > - WiNOT (Wireless Networks for Operational Technology) Cute, but content free... -tjs From twatteyne@gmail.com Tue Aug 13 17:33:25 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 46C3311E81C0 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 17:33:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.144 X-Spam-Level: X-Spam-Status: No, score=-1.144 tagged_above=-999 required=5 tests=[AWL=-0.833, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, SARE_HTML_USL_OBFU=1.666] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1iIobTH6+GD7 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 17:33:24 -0700 (PDT) Received: from mail-pa0-x232.google.com (mail-pa0-x232.google.com [IPv6:2607:f8b0:400e:c03::232]) by ietfa.amsl.com (Postfix) with ESMTP id 634A211E80D2 for <6tsch@ietf.org>; Tue, 13 Aug 2013 17:33:24 -0700 (PDT) Received: by mail-pa0-f50.google.com with SMTP id fb10so9587874pad.9 for <6tsch@ietf.org>; Tue, 13 Aug 2013 17:33:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=I7XA3hQwrOpQimcCwytLxmXg28jaxBZbOpGN9fr+Tfw=; b=TIA6ClPk6IWe0H2TE1quxsrNY5GwHB23Z4gE24afg7esZSDZ9oIkEB4H6RXE5yQIWj MozQNo0pasi7QeZMpJL108WZ9Ghwmlon0X4dP1x9MmUGNkBqL+CbtE0LfAA+avCpLzx3 ldF755l9gpZU3A4XCQM+6I11WUv0uPawJpPRq3yAXSOFl3FRAsqbqzwgmk0cU+OTZK1Y 37zrE+Iwm9hkBKOXQJ96n+x83fmdyzPqwXghCp0BQ7oQk2z5LP9bLbpIvRUDpK/QT+gH +r5Pk8AvYqTWcVmQ32yRBRrXWSPjvxeFothohBcuyuBWGs4WNeQnVwFEJhYxec8f2EZC WjGQ== X-Received: by 10.66.121.131 with SMTP id lk3mr7110603pab.43.1376440404113; Tue, 13 Aug 2013 17:33:24 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 13 Aug 2013 17:33:04 -0700 (PDT) In-Reply-To: <520ACE65.8080604@saloits.com> References: <520ACE65.8080604@saloits.com> From: Thomas Watteyne Date: Tue, 13 Aug 2013 17:33:04 -0700 X-Google-Sender-Auth: 2PeYUUcgkBdMQxZ1boRovJIZ9m8 Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b2e138d577f2504e3dd81d3 Subject: Re: [6tsch] [IMPORTANT] issues with the name 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Aug 2013 00:33:25 -0000 --047d7b2e138d577f2504e3dd81d3 Content-Type: text/plain; charset=ISO-8859-1 Timothy, Great feedback. As you point out, it is too early to start talking about extending this work to MAC techniques other than TSCH. That being said, I certainly agree that it would be good to not "lock" to a particular MAC. To answer your concerns, I believe a single/dual channel TS network can be equivalent to a TSCH network with all but 1 or 2 channels blacklisted. So it should be fairly simple to adapt. Please make sure to vote for your preferred acronym. Thomas On Tue, Aug 13, 2013 at 5:25 PM, Timothy J. Salo wrote: > A few comments on names: > > > TSCH clearly identifies the TSCH mode of IEEE802.15.4e. >> > > This is the IETF. I don't think that "TSCH" currently has much meaning > beyond the handful of people on this list and a few other people in > the standards community. I think our name ought to speak to a wider > audience > > OK, maybe "TSCH" is marginally useful for search engine optimization > (i.e., helping people who Google "TSCH" find the working group). But, > I don't think that is a very good motivation. > > > - sixtus (IPv6 over Time-Slotted Channel Hopping) >> - 6TiSCH (IPv6 over Time-Slotted Channel Hopping) >> - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) >> - 6TiC (IPv6 over Time-slotted Channel hopping ) >> - 6TiS (Time slotted Synchronized) >> > > I would call this 6TiS (IPv6 over Time-Slotted [MAC] protocols). The > "Synchronized" seems superfluous to me, but perhaps I'm missing > something. > > I would also like to see working group give a bit of consideration to > non-channel-hopping time-slotted protocols. My particular interest is > narrowband very high frequency (VHF) and ultra-high frequency (UHF) > RF channels, where a time-slotted MAC protocol is potentially > beneficial, but where channel hopping usually isn't an option. No, > I don't think that non-channel-hopping time-slotted protocols ought > to be a current work item at this point, but it would be nice if > the protocols developed by the working group could easily be extended > to single-channel operation (or may two-channel operation, where the > access point transmits on one channel and receives on another channel). > > > - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) >> > > Operating systems already use "time sliced"; I think we want to use > the term "time slotted". > > > - WiNOT (Wireless Networks for Operational Technology) >> > > Cute, but content free... > > -tjs > ______________________________**_________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/**listinfo/6tsch > --047d7b2e138d577f2504e3dd81d3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Timothy,

    Great feedback. As you point o= ut, it is too early to start talking about extending this work to MAC techn= iques other than TSCH. That being said, I certainly agree that it would be = good to not "lock" to a particular MAC. To answer your concerns, = I believe a single/dual channel TS network can be equivalent to a TSCH netw= ork with all but 1 or 2 channels blacklisted. So it should be fairly simple= to adapt.

    Please make sure to vote for your preferred acronym.

    Thomas

    On Tue, Aug 13, 2013 at 5:25 PM, Timothy J. Sal= o <salo@saloits.com> wrote:
    A few comments on names:

    TSCH clearly identifies the TSCH mode of IEEE802.15.4e.

    This is the IETF. =A0I don't think that "TSCH" currently has = much meaning
    beyond the handful of people on this list and a few other people in
    the standards community. =A0I think our name ought to speak to a wider
    audience

    OK, maybe "TSCH" is marginally useful for search engine optimizat= ion
    (i.e., helping people who Google "TSCH" find the working group). = =A0But,
    I don't think that is a very good motivation.


    - sixtus (IPv6 over Time-Slotted Channel Hopping)
    - 6TiSCH (IPv6 over Time-Slotted Channel Hopping)
    - 6TiCS (IPv6 over Time-slotted Channel hopping Slots)
    - 6TiC (IPv6 over Time-slotted Channel hopping )
    - 6TiS (Time slotted Synchronized)

    I would call this 6TiS (IPv6 over Time-Slotted [MAC] protocols). =A0The
    "Synchronized" seems superfluous to me, but perhaps I'm missi= ng
    something.

    I would also like to see working group give a bit of consideration to
    non-channel-hopping time-slotted protocols. =A0My particular interest is narrowband very high frequency (VHF) and ultra-high frequency (UHF)
    RF channels, where a time-slotted MAC protocol is potentially
    beneficial, but where channel hopping usually isn't an option. No,
    I don't think that non-channel-hopping time-slotted protocols ought
    to be a current work item at this point, but it would be nice if
    the protocols developed by the working group could easily be extended
    to single-channel operation (or may two-channel operation, where the
    access point transmits on one channel and receives on another channel).

    - 6chants (IPv6 over Channel Hopping ANd Time Sliced links)

    Operating systems already use "time sliced"; I think we want to u= se
    the term "time slotted".


    - WiNOT (Wireless Networks for Operational Technology)

    Cute, but content free...

    -tjs
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
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    --047d7b2e138d577f2504e3dd81d3-- From salo@saloits.com Tue Aug 13 18:05:38 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3799B21E8086 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 18:05:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hGH6Ir1ZRhxk for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 18:05:32 -0700 (PDT) Received: from mail.saloits.com (saloits.com [208.42.140.127]) by ietfa.amsl.com (Postfix) with ESMTP id 26D1E11E80E0 for <6tsch@ietf.org>; Tue, 13 Aug 2013 18:05:32 -0700 (PDT) Received: from [134.84.155.43] (x-134-84-155-43.uofm-secure.wireless.umn.edu [134.84.155.43]) by mail.saloits.com (8.14.4/8.14.3) with ESMTP id r7E15PSZ028237; Tue, 13 Aug 2013 20:05:26 -0500 Message-ID: <520AD7D2.9050408@saloits.com> Date: Tue, 13 Aug 2013 20:05:22 -0500 From: "Timothy J. Salo" User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 MIME-Version: 1.0 To: 6TSCH <6tsch@ietf.org> References: <520ACE65.8080604@saloits.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [6tsch] [IMPORTANT] issues with the name 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Aug 2013 01:05:38 -0000 > ... it would be good to not "lock" to a particular MAC. This is my objection to names that try to include "TSCH". No, I don't think that this is the time or the place to try to develop a general protocol to manage time-slotted MAC protocols. But, I would like us to occasionally recognize the benefits of a general solution, if someone (probably someone else) could develop it. > ...I believe a single/dual channel TS network > can be equivalent to a TSCH network with all but 1 or 2 channels > blacklisted. So it should be fairly simple to adapt. I believe that this is probably the case. But, I haven't read the specifications and documents. Maybe by Vancouver... -tjs From twatteyne@gmail.com Tue Aug 13 18:07:31 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 495F221E8086 for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 18:07:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.769 X-Spam-Level: X-Spam-Status: No, score=-1.769 tagged_above=-999 required=5 tests=[AWL=0.208, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9Af+YWG9DKKq for <6tsch@ietfa.amsl.com>; Tue, 13 Aug 2013 18:07:29 -0700 (PDT) Received: from mail-pd0-x233.google.com (mail-pd0-x233.google.com [IPv6:2607:f8b0:400e:c02::233]) by ietfa.amsl.com (Postfix) with ESMTP id 40C8011E80E0 for <6tsch@ietf.org>; Tue, 13 Aug 2013 18:07:29 -0700 (PDT) Received: by mail-pd0-f179.google.com with SMTP id v10so5625074pde.38 for <6tsch@ietf.org>; Tue, 13 Aug 2013 18:07:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=hz9CykNATdzwuhWku597Bm4pZsJ3u10PRx5XGxw/qVQ=; b=cUQpg4xJeDf7G625PfEmdP7c04FjmA9XjRkMUI8l3F9aW3ZLEHagQtLYvBCKFYnjlP DCN4F+kwzAsuSA8ij6Wu53sJxJHFj47k+n7NN/6l6Gt2Nk0KtrZ2+pBI3cdaPxYuYb74 m3Iq1jUYoluMeQKoI4phZXfmS8JAfQSKQJIbpYovvlaS7EqJSn7RAedvSikfP3fwn17x uh/CMaIkVhosLFLa9MIpzu+m6R5usw0wKk784/+oBC7KsCYgwAzKybrbwPQgzWsopWwR 21vmBQB/Mp3aNkPT0K+Yr74UhtV3XVf74Y8qEYwbS5R0CS3dk+80ZsE9JL9l7BI/IkMR 3Niw== X-Received: by 10.68.228.201 with SMTP id sk9mr7178876pbc.4.1376442448888; Tue, 13 Aug 2013 18:07:28 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 13 Aug 2013 18:07:08 -0700 (PDT) In-Reply-To: References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1851958D@xmb-rcd-x04.cisco.com> From: Thomas Watteyne Date: Tue, 13 Aug 2013 18:07:08 -0700 X-Google-Sender-Auth: THWOOS-UZdlpGjqmndCDg70c4g4 Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b162d11384a7e04e3ddfb3c Subject: Re: [6tsch] about format X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Aug 2013 01:07:31 -0000 --047d7b162d11384a7e04e3ddfb3c Content-Type: text/plain; charset=ISO-8859-1 I see two options (although I'm not a BSON expert!!): - An array of 5 bytes: {"ASN": [0x01,0x02,0x03,0x04,0x05]} - An "opaque" binary value (\x05 element type)? {"ASN": 0x0102030405} Running through the encoding of both, it looks like the second option yields much smaller code. That being said, it would be interesting to see how small you will be able to get the representation. The first question at http://bsonspec.org/#/faq is not very encouraging. Thomas PS: have you come across an easy way to convert JSON into BSON? Some website where you can copy-paste some JSON would be wonderful... On Tue, Aug 13, 2013 at 5:14 PM, Qin Wang wrote: > Hi All, > > I'm trying to apply BSON to express data type encountered in 6top and > 802.15.4e. I'm not sure if ASN will be included in some management > messages or not. But, if needed, how to express uint40 (5bytes integer) > with BSON? > > Thanks > Qin > > > > On Tue, Aug 13, 2013 at 3:03 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote: > >> +1. >> >> Please note that the goal of item 1 is to define the format of the >> payload, not per se the transport method. >> >> Thomas >> >> >> On Mon, Aug 12, 2013 at 2:38 PM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote: >> >>> Hi Qin, >>> >>> this sounds correct to me. >>> X >>> >>> >>> On Mon, Aug 12, 2013 at 2:23 PM, Qin Wang wrote: >>> >>>> Hi Xavi and Raghuram, >>>> >>>> Now I can see the advantage of BSON. >>>> >>>> Regarding to the scope of "Timeslot Management Methods and Formats", >>>> and the relationship between task item-1 and item-2, now my understanding >>>> is as follows. >>>> >>>> (1) item-2 is about 6top. In the first step, it is a subset of 6top, >>>> only includes the commands and packets/IEs used for static case, i.e. >>>> Enhanced Beacon based schedule establishment. It still use custom format >>>> and 15.4e IE to carry. >>>> >>>> (2) item-1 is about the management messages carried by upper layer >>>> protocols like CoAP to use 6top. It is still a open issue to use BSON or >>>> custom format to define the management messages. >>>> >>>> Correct? >>>> >>>> Thanks >>>> Qin >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) < >>>> rsudhaak@cisco.com> wrote: >>>> >>>>> Qin, >>>>> There is an advantage of using BSON over regular JSON for the purpose >>>>> of transporting schedule information. Most of this info is bitmaps, and >>>>> BSON capability to handle binary payload will be efficient compared to >>>>> regular JSON. If we define the formats as regular BSON as opposed to custom >>>>> formats, the implementation of 6top in various languages will also be >>>>> easier as BSON libraries are readily available. >>>>> >>>>> From: Xavier Vilajosana Guillen >>>>> Reply-To: >>>>> Date: Monday, August 12, 2013 11:02 AM >>>>> To: Qin Wang >>>>> Cc: "6tsch@ietf.org" <6tsch@ietf.org> >>>>> Subject: Re: [6tsch] about format >>>>> >>>>> Hi Qin, >>>>> >>>>> I think that the work item aims to define the packet format of the >>>>> messages that will transport the schedule information, this is on top of >>>>> 6top. 6top has the API to handle that information and use its own messages >>>>> (using its IEs) to install the schedule in both sides of a link (if there >>>>> is connectivity between the two nodes). >>>>> >>>>> X >>>>> >>>>> >>>>> On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang wrote: >>>>> >>>>>> Xavi, >>>>>> >>>>>> It make more sense to use BSON in higher layer message definition. >>>>>> >>>>>> But if so, why it should be included in the document "Timeslot >>>>>> management methods and format" ? My understanding is the document is about >>>>>> 6top, so the format in the document refers to the format of 6top packets. >>>>>> Please point out where I'm wrong. >>>>>> >>>>>> Thanks >>>>>> Qin >>>>>> >>>>>> >>>>>> On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosana Guillen < >>>>>> xvilajosana@eecs.berkeley.edu> wrote: >>>>>> >>>>>>> Hi Qin, >>>>>>> >>>>>>> my feeling is that BSON will go in the packet from the PCE to the >>>>>>> mote that has to be scheduled. This is a higher layer issue and relates to >>>>>>> the payload of a CoAP packet sent from the PCE to the mote (and viceversa). >>>>>>> I don't think that 6top needs BSON as an encoding for the IEs. >>>>>>> >>>>>>> does it make sense? >>>>>>> X >>>>>>> >>>>>>> >>>>>>> On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang wrote: >>>>>>> >>>>>>>> Hi Pascal, >>>>>>>> >>>>>>>> During the teleconference on last Friday, you mentioned that we >>>>>>>> will investigate Binary JSON to define the message formats. I'm not very >>>>>>>> clear about what is the relationship between the Binary JSON coding and >>>>>>>> 802.15.4e Information Element. I guess that we will still use IEs to carry >>>>>>>> the 6top messages, but for those IE coding, we will use Binary JSON. >>>>>>>> Correct? >>>>>>>> >>>>>>>> By the way, what is the advantage to use Binary JSON format? What >>>>>>>> are your main considerations? >>>>>>>> >>>>>>>> Thanks >>>>>>>> Qin >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> 6tsch mailing list >>>>>>>> 6tsch@ietf.org >>>>>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > --047d7b162d11384a7e04e3ddfb3c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    I see two options (although I'm not a BSON expert= !!):
    • An array of 5 bytes:
      {"ASN": [0x01,0x02,0x03,0x04= ,0x05]}
    • An "opaque" binary value (\x05 element type)?
      {"= ;ASN": 0x0102030405}
    Running through the encoding of both, it looks like t= he second option yields much smaller code.

    Tha= t being said, it would be interesting to see how small you will be able to = get the representation. The first question at=A0http://bsonspec.org/#/faq=A0is not very encouraging.

    Thomas

    PS: have you come acros= s an easy way to convert JSON into BSON? Some website where you can copy-pa= ste some JSON would be wonderful...



    On Tue, Aug 13, 2013 at 5:14 PM, Qin Wan= g <qinwang@berkeley.edu> wrote:
    Hi All,

    I'm trying to apply BSON to= express data type encountered in 6top and =A0802.15.4e. I'm not sure i= f ASN will be included in some management messages or not. But, if needed, = how to express uint40 (5bytes integer) with BSON?

    Thanks
    Qin

    =


    On Tue, Aug 13, 2013 at 3:03 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:
    +1.

    Plea= se note that the goal of item 1 is to define the format of the payload, not= per se the transport method.

    Thomas


    On Mon, Aug 12, 2013 at 2:38 PM, Xavier Vila= josana Guillen <xvilajosana@eecs.berkeley.edu> w= rote:
    Hi Qin,

    t= his sounds correct to me.
    X


    On Mon, Aug 12, 2013 at 2:23 PM, Qin Wang <qinwang@ber= keley.edu> wrote:
    Hi Xavi and Raghuram,
    <= br>
    Now I can see the advantage of BSON.

    Regarding to the scope of=A0"Timeslot Management Methods and Formats&q= uot;, and the relationship between task item-1 and item-2, now my understan= ding is as follows.

    (1) item-2 is about 6top. In the first step, it is a su= bset of 6top, only includes the commands and packets/IEs used for static ca= se, i.e. Enhanced Beacon based schedule establishment. It still use custom = format and 15.4e IE to carry.

    (2) item-1 is about the management messages carried by = upper layer protocols like CoAP to use 6top. It is still a open issue to us= e BSON or custom format to define the management messages.

    Correct?

    Thanks
    Qin








    On Tue, Aug 13, 2013 at 3:39 AM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@= cisco.com> wrote:
    Qin,
    There is an advantage of using BSON over regular JSON for the purpose = of transporting schedule information. Most of this info is bitmaps, and BSO= N capability to handle binary payload will be efficient compared to regular= JSON. If we define the formats as regular BSON as opposed to custom formats, the implementation of 6top i= n various languages will also be easier as BSON libraries are readily avail= able.

    From: Xavier Vilajosana Guillen <= ;xvilajo= sana@eecs.berkeley.edu>
    Reply-To: <xvilajosana@eecs.berkeley.edu= >
    Date: Monday, August 12, 2013 11:02= AM
    To: Qin Wang <qinwang@berkeley.edu>
    Cc: "6tsch@ietf.org" <6tsch@ietf.org>
    Subject: Re: [6tsch] about format

    Hi Qin,

    I think that the work item aims to define the packet format of the messages= that will transport the schedule information, this is on top of 6top. 6top= has the API to handle that information and use its own messages (using its= IEs) to install the schedule in both sides of a link (if there is connectivity between the two nodes).

    X


    On Mon, Aug 12, 2013 at 10:56 AM, Qin Wang <qinwang@berke= ley.edu> wrote:
    Xavi,

    It make more sense to use BSON in higher layer message definition.=A0<= /div>

    But if so, why it should be included in the document "Timeslot ma= nagement methods and format" ? My understanding is the document is abo= ut 6top, so the format in the document refers to the format of 6top packets= . Please point out where I'm wrong.

    Thanks
    Qin


    On Tue, Aug 13, 2013 at 1:46 AM, Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Qin,

    my feeling is that BSON will go in the packet from the PCE to the mote that= has to be scheduled. This is a higher layer issue and relates to the paylo= ad of a CoAP packet sent from the PCE to the mote (and viceversa). I don= 9;t think that 6top needs BSON as an encoding for the IEs.

    does it make sense?
    X


    On Mon, Aug 12, 2013 at 10:39 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Pascal,

    During the teleconference on last Friday, you mentioned that we will i= nvestigate Binary JSON to define the message formats. I'm not very clea= r about what is the relationship between the Binary JSON coding and 802.15.= 4e Information Element. I guess that we will still use IEs to carry the 6top messages, but for those IE coding,= we will use Binary JSON. Correct?

    By the way, what is the advantage to use Binary JSON format? What are = your main considerations?

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    --047d7b162d11384a7e04e3ddfb3c-- From rstruik.ext@gmail.com Wed Aug 14 05:58:50 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 746F711E8152 for <6tsch@ietfa.amsl.com>; Wed, 14 Aug 2013 05:58:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id D60dcX9uIYPY for <6tsch@ietfa.amsl.com>; Wed, 14 Aug 2013 05:58:49 -0700 (PDT) Received: from mail-qc0-x22d.google.com (mail-qc0-x22d.google.com [IPv6:2607:f8b0:400d:c01::22d]) by ietfa.amsl.com (Postfix) with ESMTP id 400E211E815B for <6tsch@ietf.org>; Wed, 14 Aug 2013 05:58:49 -0700 (PDT) Received: by mail-qc0-f173.google.com with SMTP id z10so4840524qcx.18 for <6tsch@ietf.org>; Wed, 14 Aug 2013 05:58:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type; bh=BRrZZYRlP8owzocVoPSVdbW9EyH/egLQmmHPbjn2N4o=; b=wk7U1z8jl2CJd5scJvKRsKvOyt4kqIXMrC9dUvCOURR/fkqWuhr+D/7MEXTC1BF9cw lpuKtQG8bA4uY9IU89lR+qP+WDDNIfZfRaaRsUBAn15QLlpnStsmC68t6IYYH6VxIcfo IdKyp8q4mR2sz5Psiw5OixjM5YhA2X/ILD9J78XeJQs7RcIQbu+NrdcebQ7zHkvlbVMQ zTVsw5tHQHadTvFHCfCLvufaGZZdfxbSQU77IDSc9K8bZxvoEqz7NI6PbBlMhaZLzrAQ VUk1baIwtUk0NUW5SpN0D1CDsVCQbu7TcIownEsS7PTp8JedhUt3C2Ar3DiBNiE3zP7E THzA== X-Received: by 10.49.75.103 with SMTP id b7mr4531698qew.85.1376485127787; Wed, 14 Aug 2013 05:58:47 -0700 (PDT) Received: from [192.168.1.102] (CPE0013100e2c51-CM001cea35caa6.cpe.net.cable.rogers.com. [99.231.4.27]) by mx.google.com with ESMTPSA id 9sm19731998qau.3.2013.08.14.05.58.46 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 14 Aug 2013 05:58:46 -0700 (PDT) Message-ID: <520B7EFD.3090609@gmail.com> Date: Wed, 14 Aug 2013 08:58:37 -0400 From: Rene Struik User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: Thomas Watteyne References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------070403010004070002010905" Cc: 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] [IMPORTANT] issues with the name 6TSCH X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Aug 2013 12:58:50 -0000 This is a multi-part message in MIME format. --------------070403010004070002010905 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Why not simply hyphenating things: 6-T-S-C-H? (it even suggest a multi-hop network :) ) On 8/13/2013 7:04 PM, Thomas Watteyne wrote: > All, > > We had a vote in February on in the ML to pick a name, and the group > chose "6TSCH" because (1) 6 appears early in the alphabet and (2) TSCH > clearly identifies the TSCH mode of IEEE802.15.4e. > > Concerns about this acronym were raised in Berlin, first about > pronunciation difficulties, then about a potential naming collision. > While initially people proposed some alternative names, during last > week, the ML leaned toward keeping the name 6TSCH. We discussed this > on the call last Friday, and ended with a rough consensus. Pascal and > myself then spent a couple of days discussing this with several people > at the IETF. > > The conclusion is that this potential naming collision is not taken > lightly by the IETF. The possibility that a name might be interpreted > as offensive, in particular when pronounced as "6-tush", is something > we absolutely want to avoid, in particular in the light of the recent > PyCon fiasco. The group is therefore asked to pick a different name. > > Having been part of the selection of the name "6TSCH", I know that we > had no idea "6TSCH" could be mis-pronounced. I also understand that we > have advertised and used the name "6TSCH" for the last couple of > months, and that we got attached to it. Yet, if there is a chance of > misinterpretation, we should change it now rather than later. > > This means that we get to pick another name. We are looking for a name > that can be read and pronounced easily and unambiguously regardless of > the native language. The following names were discussed: > - sixtus (IPv6 over Time-Slotted Channel Hopping) > - 6TiSCH (IPv6 over Time-Slotted Channel Hopping) > - 6TiCS (IPv6 over Time-slotted Channel hopping Slots) > - 6TiC (IPv6 over Time-slotted Channel hopping ) > - 6TiS (Time slotted Synchronized) > - 6chants (IPv6 over Channel Hopping ANd Time Sliced links) > - WiNOT (Wireless Networks for Operational Technology) > > I opened a poll at http://www.surveymonkey.com/s/SJDXKQF. > > Please take minute to respond with your ordered preference so we can > conduct a Condorcet vote > http://en.wikipedia.org/wiki/Condorcet_method; in case of ambiguity, > we'll use ranked pair and the winner will be announced during the next > call. > > Pascal & Thomas > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch -- email: rstruik.ext@gmail.com | Skype: rstruik cell: +1 (647) 867-5658 | US: +1 (415) 690-7363 --------------070403010004070002010905 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
    Why not simply hyphenating things: 6-T-S-C-H? (it even suggest a multi-hop network :) )


    On 8/13/2013 7:04 PM, Thomas Watteyne wrote:
    All,

    We had a vote in February on in the ML to pick a name, and the group chose "6TSCH" because (1) 6 appears early in the alphabet and (2) TSCH clearly identifies the TSCH mode of IEEE802.15.4e. 

    Concerns about this acronym were raised in Berlin, first about pronunciation difficulties, then about a potential naming collision. While initially people proposed some alternative names, during last week, the ML leaned toward keeping the name 6TSCH. We discussed this on the call last Friday, and ended with a rough consensus. Pascal and myself then spent a couple of days discussing this with several people at the IETF.

    The conclusion is that this potential naming collision is not taken lightly by the IETF. The possibility that a name might be interpreted as offensive, in particular when pronounced as "6-tush", is something we absolutely want to avoid, in particular in the light of the recent PyCon fiasco. The group is therefore asked to pick a different name.

    Having been part of the selection of the name "6TSCH", I know that we had no idea "6TSCH" could be mis-pronounced. I also understand that we have advertised and used the name "6TSCH" for the last couple of months, and that we got attached to it. Yet, if there is a chance of misinterpretation, we should change it now rather than later.

    This means that we get to pick another name. We are looking for a name that can be read and pronounced easily and unambiguously regardless of the native language. The following names were discussed:
    - sixtus (IPv6 over Time-Slotted Channel Hopping)
    - 6TiSCH (IPv6 over Time-Slotted Channel Hopping)
    - 6TiCS (IPv6 over Time-slotted Channel hopping Slots)
    - 6TiC (IPv6 over Time-slotted Channel hopping )
    - 6TiS (Time slotted Synchronized)
    - 6chants (IPv6 over Channel Hopping ANd Time Sliced links)
    - WiNOT (Wireless Networks for Operational Technology)


    Please take minute to respond with your ordered preference so we can conduct a Condorcet vote http://en.wikipedia.org/wiki/Condorcet_method; in case of ambiguity, we'll use ranked pair and the winner will be announced during the next call.

    Pascal & Thomas


    _______________________________________________
6tsch mailing list
6tsch@ietf.org
https://www.ietf.org/mailman/listinfo/6tsch



    -- 
email: rstruik.ext@gmail.com | Skype: rstruik
cell: +1 (647) 867-5658 | US: +1 (415) 690-7363
    --------------070403010004070002010905-- From twatteyne@gmail.com Thu Aug 15 09:50:37 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5DE3011E81DB for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 09:50:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.81 X-Spam-Level: X-Spam-Status: No, score=-1.81 tagged_above=-999 required=5 tests=[AWL=0.167, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9VE91YRBh7Ec for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 09:50:36 -0700 (PDT) Received: from mail-pb0-x22b.google.com (mail-pb0-x22b.google.com [IPv6:2607:f8b0:400e:c01::22b]) by ietfa.amsl.com (Postfix) with ESMTP id 8605C11E81D9 for <6tsch@ietf.org>; Thu, 15 Aug 2013 09:50:35 -0700 (PDT) Received: by mail-pb0-f43.google.com with SMTP id md4so956565pbc.2 for <6tsch@ietf.org>; Thu, 15 Aug 2013 09:50:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=FTk2E8pTFpvQANXPaDgrBhGjmOaRD8xtc8O9yhJmEwI=; b=QU1YI4v6w49aoxT/2ChoHOftIELTsqzlBo+6EjYHWxD9a0Jh7KQxrkpVSjetXsI0/y nP53OZ5R1CeI8bBdLMDSQdHyFu+bYZ3+u2EY+OISBTOLzhLibUvss2LK/K4Mu8797wky 5OngfGK3i/8h88HU52G1qHJd/9Uv+pF9b55WTAQTfw/no2uixWg9xxfLioJMkVb9Qsd1 E2ZngMi0auiIGuRoNDofC3S1X6bMy74FWhtRsGI6igvgmnEHcIFQoG13ES1ufQNKUn87 GdSr1PfMoeBvHQbKugDPZJyimPBWj6M9zeW6s3aB7GuXS+2FuolOdddYdYlONRMAZacD 3Rng== X-Received: by 10.66.150.41 with SMTP id uf9mr8043430pab.108.1376585434702; Thu, 15 Aug 2013 09:50:34 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Thu, 15 Aug 2013 09:50:14 -0700 (PDT) From: Thomas Watteyne Date: Thu, 15 Aug 2013 09:50:14 -0700 X-Google-Sender-Auth: WnWcyzz8gmdjQBFfnveNcbeGDvk Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b6d7f14d6a86d04e3ff4534 Subject: [6tsch] NO webex tomorrow August 16 X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Aug 2013 16:50:37 -0000 --047d7b6d7f14d6a86d04e3ff4534 Content-Type: text/plain; charset=ISO-8859-1 All, Several people indicated they are on vacation this week. Exceptionally, there will not be a 6TSCH call tomorrow August 16. Let's continue the discussion on the ML. I have updated the https://bitbucket.org/6tsch/meetings accordingly. Thomas --047d7b6d7f14d6a86d04e3ff4534 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    Several people indicated they are = on vacation this week. Exceptionally, there will not be a 6TSCH call tomorr= ow August 16. Let's continue the discussion on the ML.

    I have updated the=A0= https://bitbucket.org/6tsch/meetings accordingly.

    <= div>Thomas
    --047d7b6d7f14d6a86d04e3ff4534-- From rsudhaak@cisco.com Thu Aug 15 12:06:58 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F020511E8222 for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 12:06:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id K7o4yEo0pVzf for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 12:06:52 -0700 (PDT) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id 1F49511E8215 for <6tsch@ietf.org>; Thu, 15 Aug 2013 12:06:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=18395; q=dns/txt; s=iport; t=1376593612; x=1377803212; h=from:to:cc:subject:date:message-id:in-reply-to: mime-version; bh=VlJP3tM/o300uX9AF13Yx8+SNCeqMNr5yMlPtVxNf5s=; b=jN+lmcv+PjmmExe9CzLEpx+6w1DUIVQcdnrQjrcwWRN5FphNOQB5hCYu Owf4fdVzS4YSAVtXdf/GXP+Ak1MqATY9Xo7KMn3ESHmkbyqOZN72MxVnD cVswbmCi1wWzY3lUv1nfIblagfwicYIHqbCkUB2+J4vqtq5zC4j8Rlttf k=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Am0FAPAlDVKtJV2b/2dsb2JhbABbDoI0RIEFvyCBIRZ0giQBAQEEJ1ISAQgRAwECCx05FAkIAgQOBQiICLoikB8gEQYBBoMVdwOpNoJdPoIq X-IronPort-AV: E=Sophos;i="4.89,887,1367971200"; d="scan'208,217";a="247646803" Received: from rcdn-core-4.cisco.com ([173.37.93.155]) by rcdn-iport-1.cisco.com with ESMTP; 15 Aug 2013 19:06:51 +0000 Received: from xhc-aln-x02.cisco.com (xhc-aln-x02.cisco.com [173.36.12.76]) by rcdn-core-4.cisco.com (8.14.5/8.14.5) with ESMTP id r7FJ6pw1004471 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 15 Aug 2013 19:06:51 GMT Received: from xmb-rcd-x04.cisco.com ([169.254.8.180]) by xhc-aln-x02.cisco.com ([173.36.12.76]) with mapi id 14.02.0318.004; Thu, 15 Aug 2013 14:06:50 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: Qin Wang Thread-Topic: Message flows Thread-Index: AQHOmS7T2+M8VWnoB0iALAow4p1lsJmVjRCA//+VLYCAAW4AgP//n/gAgACPZID//8GzAA== Date: Thu, 15 Aug 2013 19:06:50 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.154.213.84] Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82Bxmbrcdx04ciscoc_" MIME-Version: 1.0 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Aug 2013 19:06:58 -0000 --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82Bxmbrcdx04ciscoc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82Bxmbrcdx04ciscoc_ Content-Type: text/html; charset="us-ascii" Content-ID: <1E7A5F36F4DFD74192A8B213C69E2351@emea.cisco.com> Content-Transfer-Encoding: quoted-printable
    HI Qin,
    The conflicts I am referring to are -

    Consdiering multihop communication and hard-cells
    1. Route 1 requires a particular set of slots to be setup. Say node A must= listen on slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But another = route 2 requires node A to listen on slot 35. 
    There may be other such conflicts that we may need to resolve.

    -raghuram


    Hi Raghuram,

    I totally agree to your approach to define the flow information to L3.=

    Regarding to your question, can you explain more about:
    (1) from nodeA to nodeB is one hop or multi-hop?
    (2) installing the route with hard cells or soft cells?
    (3) what "conflict during route installation" mean? what kin= d of conflict?

    Thanks
    Qin




    On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudha= akar (rsudhaak) <rsudhaak@cisco.com> wrote:
    Qin,
    I have pretty much the same line of thought. I agree with the point th= at 6top is independent from L3. What we are trying to do is define what L3 = will need to implement to obtain information from 6top. Obviously, 6top wil= l expose these interfaces in its standard implementation.

    Do you think finding the common requirements from 6top to L3 flows bet= ween RPL and PCE is a good place to start? I am sure there are going to be = some specific requirements for each but they can be added as PCE or RPL spe= cific primitives. I am not suggesting that we implement specific primitives for every L3 protocol, but once we c= over RPL and PCE I think we will satisfy the requirements of most L3s.

    The different flows you have identified is perfect. 
    (1) The flows from 6top -&= gt; L2 have been addressed quite extensively in the draft already. There ar= e a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for e..g.
    (2) I would consider the r= equirements of PCE, RPL, (probably v6ND) in terms of parameters required fo= r route computation to define the general requirements for flows between L3= and 6top. In the draft, you have already addressed some RPL specific primitives like control message delive= ry. I think this should go in the RPL specific part. We define primitives t= o expose parameters required by L3 to perform route computation in the gene= ral flows. For e.g. L2 neighbor list, link quality to each neighbor. We need to specify the message format= that needs to used by L3 to obtain this info.
    (3) We will also need 6top= ->L3 flows to be defined. For e.g., in the RPL case,  GET_RPL_PARENT will be one such flow as 6top ne= eds to provide the primitive GET_TIMING_<= /span>PARENT in the L2->6top flow. A similar primitive needs to be there for PCE.

    (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor = entity and 6top is the data provider. This is my own convention and hence t= he clarification)

    Another critical part I want to get your opinions on is the following.= We have decided that irrespective of L3 (PCE or RPL) a node A will initiat= e route installation request when it has data to send to node B. In this ca= se -
    1. How do resolve conflict during route installation? L3 computes a route = and send it over to 6top. Which in turn converts it to slot reservations us= ing the 6top -> L2 primitives in the slot frame. What if there is a conf= lict during this slot reservation? What are the messages that will inform L3 and the node that route installa= tion failed? This must also cause L3 to recompute its route.
    2. Then w= e have to ask, does 6top provide a mechanism to inform L3 about failure and= obtain a recomputed route (i.e.) perform n number of retries. Or just fail= after one try and leave it to the node to reinitiate a route request.
    -raghuram


    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:0= 0 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>=
    Cc: "xvilajosana@eecs.berkeley.edu= " <xvilajosana@eecs.berkeley.edu>
    Subject: Re: Message flows

    Hi Raghuram,

    Sorry for the late response. It is welcome for you to add flow informa= tion if necessary.

    Just one thing I want to understand more clearly. I think 6top is a re= latively independent sublayer from upper layer. RPL is used as upper layer = in the first step, but, just one kind of upper layers in the future. Correc= t? 

    In this sense, we should separate the general flow information to uppe= r layer and the specific flow information to RPL. Then, can we organize the= flow information related to 6top in this way?

    (1) flow information with L2, i.e. TSCH
    (2) general flow information with upper layer, may be L3 or L2.5
    (3) flow information with specific upper layer protocol like RPL.

    What do you think?

    Qin 













    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaa= kar (rsudhaak) <rsudhaak@cisco.com> wrote:
    Ok. 

    Qin, if you are OK I can add the flow information specific to RPL.&nbs= p;

    -raghuram

    From: Xavier Vilajosana Guillen <= ;xvilajo= sana@eecs.berkeley.edu>
    Reply-To: "xvilajosana@eecs.berkeley.e= du" <xvilajosana@eecs.berkeley.edu>
    Date: Wednesday, August 14, 2013 2:= 32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>=
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

    Hi Raghuram,

    I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome!

    X


    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaa= kar (rsudhaak) <rsudhaak@cisco.com> wrote:
    Xavi, Qin,
    I believe that there is some information that needs to be added to the= message flows that will occur between L3 -> 6top and L2 -> 6top, in = addition to what is already there in Qin's draft. I wanted to check with yo= u guys if you want to add to the same document or split it into a separate RFC. When I say split into separate R= FC,  what I mean is, L3 to 6top is one RFC and L2 to 6top is another. = The current draft has a lot of information about L2 to 6top. I could add mo= re about the RPL to 6top is its OK..

    -raghuram



     --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82Bxmbrcdx04ciscoc_-- From P.Zand@utwente.nl Thu Aug 15 14:53:03 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F293011E8192 for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 14:53:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.503 X-Spam-Level: X-Spam-Status: No, score=-0.503 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LINFOSGWqEdz for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 14:52:54 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 5176721F9991 for <6tsch@ietf.org>; Thu, 15 Aug 2013 14:52:53 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Thu, 15 Aug 2013 23:52:54 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Thu, 15 Aug 2013 23:52:51 +0200 From: To: , Thread-Topic: Message flows Thread-Index: AQHOmS7T2+M8VWnoB0iALAow4p1lsJmVjRCA//+VLYCAAW4AgP//n/gAgACPZID//8GzAAAJ+CqA Date: Thu, 15 Aug 2013 21:52:50 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> In-Reply-To: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34EXMBX23adutwent_" MIME-Version: 1.0 Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Aug 2013 21:53:03 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34EXMBX23adutwent_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Raghuram, Qin, Let me enter to your discussion I agree with Raghuram that when the higher layer call the 6top's commands (= or .requests primitives) it should be informed about the status of its requ= est by "command reply" or ".confirm" primitives. The status of the ".confir= m" or "reply" can be success, failure or ... Am I right? I couldn't either find the 6top's behavior upon receiving the "MLME-SET-SLO= TFRAME.confirm" or "MLME-SET-LINK.confirm" primitives that might be called = by L2. Did I miss that? Raghuram, I just have one minor comment, in your example. I think that the = RPL (L3) should use the "Create soft cell command" to ask a new cell withou= t specifying the exact cell. Because the L3 does not have enough informatio= n to ask for reserving specific cell in L2. The "Create hard cell command" = should be called by the one who has the global knowledge on network schedul= es, like PCE. However, I agree that the PCE by calling the "Create hard cel= l command" or RPL by calling "Create soft cell command" should be informed = by 6top about the status of its request. For example, It might happen that = PCE send a same request twice or RPL's request can't be serviced. AM I right? Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of R= aghuram Sudhaakar (rsudhaak) Sent: Thursday, August 15, 2013 9:07 PM To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34EXMBX23adutwent_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Hi Raghuram, Qin,

    Let me enter to your disc= ussion

    I agree with Raghuram tha= t when the higher layer call the 6top’s commands (or .requests primit= ives) it should be informed about the status of its request by “command reply” or “.confirm” primitives. The stat= us of the “.confirm” or “reply” can be success, fai= lure or …

    Am I right?

    I couldn’t either f= ind the 6top’s behavior upon receiving the “MLME-SET-SLOTFRAME.= confirm” or “MLME-SET-LINK.confirm” primitives that might= be called by L2. Did I miss that?

     <= /p>

    Raghuram, I just have one= minor comment, in your example. I think that the RPL (L3) should use the &= #8220;Create soft cell command” to ask a new cell without specifying the exact cell. Because the L3 does not have enough information to ask for= reserving specific cell in L2. The “Create hard cell command” = should be called by the one who has the global knowledge on network schedul= es, like PCE. However, I agree that the PCE by calling the “Create hard cell command” or RPL by calling &#= 8220;Create soft cell command” should be informed by 6top about the s= tatus of its request. For example, It might happen that PCE send a same req= uest twice or RPL’s request can’t be serviced.

    AM I right?

     <= /p>

    Pouria.   =   

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.org
    Subject: Re: [6tsch] Message flows

     

    HI Qin,

    The conflicts I am referrin= g to are -

     

    Consdiering multihop commun= ication and hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68<= /span>
    2. But another route 2 requires node A to listen on slot 35. = ;

    There may be other such con= flicts that we may need to resolve.

     

    -raghuram=

     

     

    Hi Raghuram,

     

    I totally agree to your app= roach to define the flow information to L3.

     

    Regarding to your question,= can you explain more about:

    (1) from nodeA to nodeB is = one hop or multi-hop?

    (2) installing the route wi= th hard cells or soft cells?

    (3) what "conflict dur= ing route installation" mean? what kind of conflict?=

     

    Thanks

    Qin

     

     

     

    On Thu, Aug 15, 2013 at 10:= 16 PM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Qin,

    I have pretty much the same= line of thought. I agree with the point that 6top is independent from L3. = What we are trying to do is define what L3 will need to implement to obtain information from 6top. Obviously, 6top will expose the= se interfaces in its standard implementation.

     

    Do you think finding the co= mmon requirements from 6top to L3 flows between RPL and PCE is a good place= to start? I am sure there are going to be some specific requirements for each but they can be added as PCE or RPL specific primiti= ves. I am not suggesting that we implement specific primitives for every L3= protocol, but once we cover RPL and PCE I think we will satisfy the requir= ements of most L3s.

     

    The different flows you hav= e identified is perfect. 

    (1) The flows from 6top -&g= t; L2 have been addressed quite extensively in the draft already. There are= a few flows from L2 -> 6top that have to be addressed. GET_TIMING_P<= /i>ARENT for e..g.

    (2) I would consider the re= quirements of PCE, RPL, (probably v6ND) in terms of parameters required for= route computation to define the general requirements for flows between L3 and 6top. In the draft, you have already addressed some R= PL specific primitives like control message delivery. I think this should g= o in the RPL specific part. We define primitives to expose parameters requi= red by L3 to perform route computation in the general flows. For e.g. L2 neighbor list, link quality to each neig= hbor. We need to specify the message format that needs to used by L3 to obt= ain this info.

    (3) We will also need 6top-= >L3 flows to be defined. For e.g., in the RPL case,  GET_RPL_PARENT will be one such flow as 6top needs to provide the primitive GET_TIMING_PARENT in the L2->6top flow. A similar primitive need= s to be there for PCE.

     

    (Note: when I say L2 -> = 6top flow, I mean L2 is the data requestor entity and 6top is the data prov= ider. This is my own convention and hence the clarification)

     

    Another critical part I wan= t to get your opinions on is the following. We have decided that irrespecti= ve of L3 (PCE or RPL) a node A will initiate route installation request when it has data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram=

     

     

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

     

    Hi Raghuram,

     

    Sorry for the late response= . It is welcome for you to add flow information if necessary.

     

    Just one thing I want to un= derstand more clearly. I think 6top is a relatively independent sublayer fr= om upper layer. RPL is used as upper layer in the first step, but, just one kind of upper layers in the future. Correct? 

     

    In this sense, we should se= parate the general flow information to upper layer and the specific flow in= formation to RPL. Then, can we organize the flow information related to 6top in this way?

     

    (1) flow information with L= 2, i.e. TSCH

    (2) general flow informatio= n with upper layer, may be L3 or L2.5

    (3) flow information with s= pecific upper layer protocol like RPL.

     

    What do you think?

     

    Qin =

     

     

     

     

     

     

     

     

     

     

     

     

    On Thu, Aug 15, 2013 at 6:1= 0 AM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Ok. =

     

    Qin, if you are OK I can ad= d the flow information specific to RPL. 

     

    -raghuram=

     

    From: Xavier Vilajosana Guillen <xvilajosana@eec= s.berkeley.edu>
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

     

    Hi Raghuram,

    I let Qin answer as she is = the main author. My opinion is that by now we keep the document as a single= file but we separate the two message flows. IMHO, if you have information to add it is more than welcome!

    X

     

    On Wed, Aug 14, 2013 at 1:4= 2 PM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is som= e information that needs to be added to the message flows that will occur b= etween L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin's draft. I wanted to check with you guys if you want = to add to the same document or split it into a separate RFC. When I say spl= it into separate RFC,  what I mean is, L3 to 6top is one RFC and L2 to= 6top is another. The current draft has a lot of information about L2 to 6top. I could add more about the RPL to 6= top is its OK..

     <= /p>

    -raghuram

     

     

     

    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34EXMBX23adutwent_-- From P.Zand@utwente.nl Thu Aug 15 15:07:57 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5F74211E81A4 for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 15:07:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.503 X-Spam-Level: X-Spam-Status: No, score=-0.503 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PA6cJl6lZOWs for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 15:07:42 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 8DF0C11E8150 for <6tsch@ietf.org>; Thu, 15 Aug 2013 15:07:35 -0700 (PDT) Received: from EXHUB02.ad.utwente.nl (130.89.4.229) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Fri, 16 Aug 2013 00:07:34 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB02.ad.utwente.nl ([130.89.4.229]) with mapi id 14.02.0328.009; Fri, 16 Aug 2013 00:07:31 +0200 From: To: , Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWD//+R/gIAAIcgA///iD4CAABkTAIADNlmg Date: Thu, 15 Aug 2013 22:07:30 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> In-Reply-To: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7DEXMBX23adutwent_" MIME-Version: 1.0 Cc: watteyne@eecs.berkeley.edu, 6tsch@ietf.org, qinwang@berkeley.edu Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Aug 2013 22:07:57 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7DEXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Raghuram, I agree with you that we need a method to pick a timing parent. We might need the L3 information on that, unless we can find a solution in = 6top to use L2 information. For example about the clock accuracy capabiliti= es of the device who has already joined the network. I am not sure if this = information is available in L2 and neighbor table. Best Wishes, Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Wednesday, August 14, 2013 12:57 AM To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang Subject: Re: [6tsch] RPL on Basic Xavi, Pouria, I think we need to keep node rank at 6top (as a read only parameter obtaine= d from L3) in order for the TSCH nodes to figure out the timing parent. In = the case where RPL node may have different ranks based on different OFs we = need a method to pick a timing parent. We should propose a default OF, that is used to compute the ranks for the p= urpose finding the timing parent. -raghuram From: Xavier Vilajosana Guillen > Reply-To: > Date: Tuesday, August 13, 2013 2:27 PM To: Pouria Zand > Cc: Thomas Watteyne >, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang = > Subject: Re: [6tsch] RPL on Basic Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, > wrote: Xavi, I guess we cannot keep "node rank" in the 6top. Because a node might have d= ifferent rank based on different metrics defined in L3. As a response, I do= n't think we can get all of those information form L3 and use them in neigh= bor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7DEXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Raghuram,=

    I agree with you that we ne= ed a method to pick a timing parent.

    We might need the L3 inform= ation on that, unless we can find a solution in 6top to use L2 information.= For example about the clock accuracy capabilities of the device who has already joined the network. I am not sure if this informati= on is available in L2 and neighbor table.

    Best Wishes,

    Pouria

     <= /p>

    From: Raghuram= Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang
    Subject: Re: [6tsch] RPL on Basic

     

    Xavi, Pouria,

    I think we need to keep nod= e rank at 6top (as a read only parameter obtained from L3) in order for the= TSCH nodes to figure out the timing parent. In the case where RPL node may have different ranks based on different OFs we need a m= ethod to pick a timing parent.

     

    We should propose a default= OF, that is used to compute the ranks for the purpose finding the timing p= arent.

     

    -raghuram=

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvila= josana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwe= nte.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@iet= f.org>, Qin Wang <qinwang= @berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

     

    Good point :-)

    agreed!
    X

     

    On Tue, Aug 13, 2013 at 2:2= 0 PM, <P.Zand@utw= ente.nl> wrote:

    Xavi,

     

    I guess we cannot keep “node rank= ” in the 6top. Because a node might have different rank based on different metrics defined in L3. As a response, I don’t think we can= get all of those information form L3 and use them in neighbor table in 6to= p. Am I right?

    I think, as you mentioned we need to wo= rk on them.

     

    Pouria  

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     

    On Tue, Aug 13, 2013 at 2:05 PM, <<= a href=3D"mailto:P.Zand@utwente.nl" target=3D"_blank">P.Zand@utwente.nl= > wrote:

    Xavi,

     

    Many thanks for your complete explanati= on. It absolutely makes sense.

     

    Just one minor question. The neighbor t= able will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?<= /p>

     

    Pouria

     

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?<= /o:p>

    there are many different ways to implement that= , this is an option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?<= /o:p>

    These are the list of known neighbors with acce= ptable RSSI, so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and = EB (at least in our openwsn implementation), it is inserted at the neighbor= table. At that point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its = information is updated (including rank). As we don't have any information a= bout connectivity (as RFC6552 describes) an initial value is set (i.e rank = + FOO). In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute= the ETX and let RPL do its work.

    So RPL knows about a new node because 6TOP keep= s information of neighbors an eventually this information is used by RPL to= update routes. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node t= o be positioned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <= P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your descripti= on. Besides, there isn't a common shared cell to send KAs. I see the operat= ion in the following way:

    6top KA timer expires and places a KA packet= into the queue (e.g this happens every 30s). TSCH layer at the begining of= a shared tx/rx slot then reads from the queue and sends the packet. This means that the KA can be send in any shar= ed slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <<= a href=3D"mailto:P.Zand@utwente.nl" target=3D"_blank">P.Zand@utwente.nl= > wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

     

    Best wishes,

    Pouria

     

    From:6tsch-bounces@= ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,<= /p>

     

    I remember keep-alive usually use dedi= cated cell, instead of shared cell, e.g. a Rx cell in child, and a Tx cell = in parent. But, with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive ha= s to use shared cell, which may result in more collision and then traffic.<= o:p>

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thoma= s Watteyne <watteyne@eecs.berkeley.edu> wrote:

    We established a while ago that we cou= ld reuse the RPL DAG structure for timekeeping. That is, a node's routing p= arent coincides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a = node keeps synchronized with its RPL parent. In the absence of traffic, the= node will periodically "keep alive" (per Xavi's e-mail) to the p= arent. How often depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will= realize its routing parent is missing after 30-60s.

     

    I believe this mechanism can serve for= NUD, at least n the child->parent case. Of course, this alone does no c= over parent->child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent c= ase?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pasc= al Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic    =

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pasc= al Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation us= ing Neighbors information described in Basic configuration.

        -this includes how = OF is calculated using numTx and numTxACK, etc..

     

    []

    -RPL configuration:<= /p>

         - storing mod= e vs non-storing mode (I vote for non-storing mode for a basic configuratio= n)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period.= Whether we use trickle algorithm (and we define the initial period) or we = use a fix period for DIO (no trickle) for basic configuration.

          -DAO period, = idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution t= o this items so we can start narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     

     

    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7DEXMBX23adutwent_-- From qinwang@berkeley.edu Thu Aug 15 15:31:40 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8EF4A11E8150 for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 15:31:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.901 X-Spam-Level: X-Spam-Status: No, score=-2.901 tagged_above=-999 required=5 tests=[AWL=0.075, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6Zrh5MXxyzup for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 15:31:35 -0700 (PDT) Received: from mail-vc0-f182.google.com (mail-vc0-f182.google.com [209.85.220.182]) by ietfa.amsl.com (Postfix) with ESMTP id 1779811E81B6 for <6tsch@ietf.org>; Thu, 15 Aug 2013 15:31:34 -0700 (PDT) Received: by mail-vc0-f182.google.com with SMTP id hf12so974124vcb.27 for <6tsch@ietf.org>; Thu, 15 Aug 2013 15:31:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=IH/kE4wffG2HLBd53rLdhZbdxMDrgg8TJDo6NFnm4oY=; b=S/zh6xrbs5/Rmbz+X8aSGVzXfjDrKUjCx2RAEi9R0q53VNS/zE60rG2iIyfZRGtTQe DEenQYbJh/57JYqAgiVXo2yj//OLePzuFdNxkQm/rrWsOKD+XM5k3+K1e5geXavOo/Lt HrrxoKUY+zZRLjLRRzUMThVH5JUKEH92FbSKtQNpdB/uzzGYdYUOgsP8QJ7BMX69gdw/ jm9mQTg2XerjXcNFe4KWMyIGJD9qcdNBBQyou5Oqashh3M0chB/sZ6KIYiZW7ooTi68i hMn64YTsB+xTHcw/0qO/pSRwqx9hET611lTOl7studQj0KlATa9eCdoljtCT+sPHg2C4 1kNg== X-Gm-Message-State: ALoCoQmJCaqbTCsV7mj4Bu4rW1EAbeWxAk9bk6aC5zHVvcaJ4aaEsUMVkGw6i/CJdX985/cPpWBk MIME-Version: 1.0 X-Received: by 10.52.120.7 with SMTP id ky7mr13895800vdb.12.1376605893271; Thu, 15 Aug 2013 15:31:33 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 15 Aug 2013 15:31:33 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> Date: Fri, 16 Aug 2013 06:31:33 +0800 Message-ID: From: Qin Wang To: "P.Zand@utwente.nl" Content-Type: multipart/alternative; boundary=089e013a25e243ba7e04e404098c Cc: "Raghuram Sudhaakar \(rsudhaak\)" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Aug 2013 22:31:40 -0000 --089e013a25e243ba7e04e404098c Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Raghuram and Pouria, The following is my understanding. (1) Taking the assumption in Raghuram's example, i.e. installing a route with hard cells, then, some role like PCE should exist and take responsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should not happen. (But, it doesn't mean a confirmation message is not needed, see the following) . (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4e. The confirmation to upper layer should come from the execution of 6top commands, which may related with the two 15.4e primitives, but not exactly same. (3) RPL is a routing protocol. It uses the TSCH schedule to forward packets, no matter the schedule is installed by PCE (hard cell) , or by some reservation protocol like RSVP (soft cell). Make sense? Thanks Qin On Fri, Aug 16, 2013 at 5:52 AM, wrote: > Hi Raghuram, Qin,**** > > Let me enter to your discussion**** > > I agree with Raghuram that when the higher layer call the 6top=92s comman= ds > (or .requests primitives) it should be informed about the status of its > request by =93command reply=94 or =93.confirm=94 primitives. The status o= f the > =93.confirm=94 or =93reply=94 can be success, failure or =85**** > > Am I right?**** > > I couldn=92t either find the 6top=92s behavior upon receiving the > =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitive= s that > might be called by L2. Did I miss that?**** > > ** ** > > Raghuram, I just have one minor comment, in your example. I think that th= e > RPL (L3) should use the =93Create soft cell command=94 to ask a new cell > without specifying the exact cell. Because the L3 does not have enough > information to ask for reserving specific cell in L2. The =93Create hard = cell > command=94 should be called by the one who has the global knowledge on > network schedules, like PCE. However, I agree that the PCE by calling the > =93Create hard cell command=94 or RPL by calling =93Create soft cell comm= and=94 > should be informed by 6top about the status of its request. For example, = It > might happen that PCE send a same request twice or RPL=92s request can=92= t be > serviced. **** > > AM I right?**** > > ** ** > > Pouria. **** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Raghuram Sudhaakar (rsudhaak) > *Sent:* Thursday, August 15, 2013 9:07 PM > *To:* Qin Wang > *Cc:* 6tsch@ietf.org > *Subject:* Re: [6tsch] Message flows**** > > ** ** > > HI Qin,**** > > The conflicts I am referring to are -**** > > ** ** > > Consdiering multihop communication and hard-cells**** > > 1. Route 1 requires a particular set of slots to be setup. Say node A > must listen on slot number 11, 34, 65 and Tx on 13, 35, 68**** > 2. But another route 2 requires node A to listen on slot 35. **** > > There may be other such conflicts that we may need to resolve.**** > > ** ** > > -raghuram**** > > ** ** > > ** ** > > Hi Raghuram, **** > > ** ** > > I totally agree to your approach to define the flow information to L3.***= * > > ** ** > > Regarding to your question, can you explain more about:**** > > (1) from nodeA to nodeB is one hop or multi-hop?**** > > (2) installing the route with hard cells or soft cells?**** > > (3) what "conflict during route installation" mean? what kind of conflict= ? > **** > > ** ** > > Thanks**** > > Qin**** > > ** ** > > ** ** > > ** ** > > On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Qin,**** > > I have pretty much the same line of thought. I agree with the point that > 6top is independent from L3. What we are trying to do is define what L3 > will need to implement to obtain information from 6top. Obviously, 6top > will expose these interfaces in its standard implementation.**** > > ** ** > > Do you think finding the common requirements from 6top to L3 flows betwee= n > RPL and PCE is a good place to start? I am sure there are going to be som= e > specific requirements for each but they can be added as PCE or RPL specif= ic > primitives. I am not suggesting that we implement specific primitives for > every L3 protocol, but once we cover RPL and PCE I think we will satisfy > the requirements of most L3s.**** > > ** ** > > The different flows you have identified is perfect. **** > > (1) The flows from 6top -> L2 have been addressed quite extensively in th= e > draft already. There are a few flows from L2 -> 6top that have to be > addressed. GET_*TIMING_P*ARENT for e..g.**** > > (2) I would consider the requirements of PCE, RPL, (probably v6ND) in > terms of parameters required for route computation to define the general > requirements for flows between L3 and 6top. In the draft, you have alread= y > addressed some RPL specific primitives like control message delivery. I > think this should go in the RPL specific part. We define primitives to > expose parameters required by L3 to perform route computation in the > general flows. For e.g. L2 neighbor list, link quality to each neighbor. = We > need to specify the message format that needs to used by L3 to obtain thi= s > info.**** > > (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL > case, GET_*RPL_*PARENT will be one such flow as 6top needs to provide > the primitive GET_*TIMING_*PARENT in the L2->6top flow. A similar > primitive needs to be there for PCE.**** > > ** ** > > (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity > and 6top is the data provider. This is my own convention and hence the > clarification)**** > > ** ** > > Another critical part I want to get your opinions on is the following. We > have decided that irrespective of L3 (PCE or RPL) a node A will initiate > route installation request when it has data to send to node B. In this ca= se > -**** > > 1. How do resolve conflict during route installation? L3 computes a > route and send it over to 6top. Which in turn converts it to slot > reservations using the 6top -> L2 primitives in the slot frame. What i= f > there is a conflict during this slot reservation? What are the message= s > that will inform L3 and the node that route installation failed? This = must > also cause L3 to recompute its route.**** > 2. Then we have to ask, does 6top provide a mechanism to inform L3 > about failure and obtain a recomputed route (i.e.) perform n number of > retries. Or just fail after one try and leave it to the node to reinit= iate > a route request. **** > > -raghuram**** > > ** ** > > ** ** > > *From: *Qin Wang > *Date: *Thursday, August 15, 2013 6:00 AM > *To: *raghuram sudhaakar > *Cc: *"xvilajosana@eecs.berkeley.edu" > *Subject: *Re: Message flows**** > > ** ** > > Hi Raghuram, **** > > ** ** > > Sorry for the late response. It is welcome for you to add flow informatio= n > if necessary.**** > > ** ** > > Just one thing I want to understand more clearly. I think 6top is a > relatively independent sublayer from upper layer. RPL is used as upper > layer in the first step, but, just one kind of upper layers in the future= . > Correct? **** > > ** ** > > In this sense, we should separate the general flow information to upper > layer and the specific flow information to RPL. Then, can we organize the > flow information related to 6top in this way?**** > > ** ** > > (1) flow information with L2, i.e. TSCH**** > > (2) general flow information with upper layer, may be L3 or L2.5**** > > (3) flow information with specific upper layer protocol like RPL.**** > > ** ** > > What do you think?**** > > ** ** > > Qin **** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Ok. **** > > ** ** > > Qin, if you are OK I can add the flow information specific to RPL. **** > > ** ** > > -raghuram**** > > ** ** > > *From: *Xavier Vilajosana Guillen > *Reply-To: *"xvilajosana@eecs.berkeley.edu" > > *Date: *Wednesday, August 14, 2013 2:32 PM > *To: *raghuram sudhaakar > *Cc: *Qin Wang > *Subject: *Re: Message flows**** > > ** ** > > Hi Raghuram,**** > > I let Qin answer as she is the main author. My opinion is that by now we > keep the document as a single file but we separate the two message flows. > IMHO, if you have information to add it is more than welcome! > > X**** > > ** ** > > On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Xavi, Qin,**** > > I believe that there is some information that needs to be added to the > message flows that will occur between L3 -> 6top and L2 -> 6top, in > addition to what is already there in Qin's draft. I wanted to check with > you guys if you want to add to the same document or split it into a > separate RFC. When I say split into separate RFC, what I mean is, L3 to > 6top is one RFC and L2 to 6top is another. The current draft has a lot of > information about L2 to 6top. I could add more about the RPL to 6top is i= ts > OK..**** > > ** ** > > -raghuram**** > > ** ** > > ** ** > > ** ** > --089e013a25e243ba7e04e404098c Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Raghuram and Pouria,

    The following i= s my understanding.

    (1) Taking the assumption i= n Raghuram's example, i.e. installing a route with hard cells, then, so= me role like PCE should exist and take responsibility to make conflict-free= . In another word, the scenario described in the Raghuram's example sho= uld not happen. (But, it doesn't mean a confirmation message is not nee= ded, see the following) .

    (2)=A0=A0=93MLME-SET= -SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are primitives of 802= .15.4e. The confirmation to upper layer should come from the execution of 6= top commands, which may related with the two 15.4e primitives, but not exac= tly same.

    (3) RPL is a routing protocol. It uses the TSCH schedul= e to forward packets, no matter the schedule is installed by PCE (hard cell= ) , or by some reservation protocol like RSVP (soft cell).

    Make sense?

    Thanks
    Qin
    <= div>
    =A0
     --089e013a25e243ba7e04e404098c-- From P.Zand@utwente.nl Thu Aug 15 16:45:12 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CFFDB21F9C6B for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 16:45:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.003 X-Spam-Level: X-Spam-Status: No, score=-0.003 tagged_above=-999 required=5 tests=[AWL=-0.500, BAYES_00=-2.599, EXTRA_MPART_TYPE=1, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6txOvlm80YkH for <6tsch@ietfa.amsl.com>; Thu, 15 Aug 2013 16:45:03 -0700 (PDT) Received: from EXEDGE01.ad.utwente.nl (exedge01.ad.utwente.nl [130.89.5.48]) by ietfa.amsl.com (Postfix) with ESMTP id B5A1C21F9A2D for <6tsch@ietf.org>; Thu, 15 Aug 2013 16:45:01 -0700 (PDT) Received: from EXHUB02.ad.utwente.nl (130.89.4.229) by EXEDGE01.ad.utwente.nl (130.89.5.48) with Microsoft SMTP Server (TLS) id 14.2.328.9; Fri, 16 Aug 2013 01:45:04 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB02.ad.utwente.nl ([130.89.4.229]) with mapi id 14.02.0328.009; Fri, 16 Aug 2013 01:45:00 +0200 From: To: Thread-Topic: Message flows Thread-Index: AQHOmS7T2+M8VWnoB0iALAow4p1lsJmVjRCA//+VLYCAAW4AgP//n/gAgACPZID//8GzAAAJ+CqA///pcYD//8tEoA== Date: Thu, 15 Aug 2013 23:44:59 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/related; boundary="_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7FEXMBX23adutwent_"; type="multipart/alternative" MIME-Version: 1.0 Cc: rsudhaak@cisco.com, 6tsch@ietf.org Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Aug 2013 23:45:12 -0000 --_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7FEXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7FEXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7FEXMBX23adutwent_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Qin, Regarding to (2), this is my understanding from the procedure for creating = a hard cell and slotframe. Am I missing something from 6top? [cid:image003.jpg@01CE9A22.37968520] Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 12:32 AM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Raghuram and Pouria, The following is my understanding. (1) Taking the assumption in Raghuram's example, i.e. installing a route wi= th hard cells, then, some role like PCE should exist and take responsibilit= y to make conflict-free. In another word, the scenario described in the Rag= huram's example should not happen. (But, it doesn't mean a confirmation mes= sage is not needed, see the following) . (2) "MLME-SET-SLOTFRAME.confirm" and "MLME-SET-LINK.confirm" are primitive= s of 802.15.4e. The confirmation to upper layer should come from the execut= ion of 6top commands, which may related with the two 15.4e primitives, but = not exactly same. (3) RPL is a routing protocol. It uses the TSCH schedule to forward packets= , no matter the schedule is installed by PCE (hard cell) , or by some reser= vation protocol like RSVP (soft cell). Make sense? Thanks Qin On Fri, Aug 16, 2013 at 5:52 AM, > wrote: Hi Raghuram, Qin, Let me enter to your discussion I agree with Raghuram that when the higher layer call the 6top's commands (= or .requests primitives) it should be informed about the status of its requ= est by "command reply" or ".confirm" primitives. The status of the ".confir= m" or "reply" can be success, failure or ... Am I right? I couldn't either find the 6top's behavior upon receiving the "MLME-SET-SLO= TFRAME.confirm" or "MLME-SET-LINK.confirm" primitives that might be called = by L2. Did I miss that? Raghuram, I just have one minor comment, in your example. I think that the = RPL (L3) should use the "Create soft cell command" to ask a new cell withou= t specifying the exact cell. Because the L3 does not have enough informatio= n to ask for reserving specific cell in L2. The "Create hard cell command" = should be called by the one who has the global knowledge on network schedul= es, like PCE. However, I agree that the PCE by calling the "Create hard cel= l command" or RPL by calling "Create soft cell command" should be informed = by 6top about the status of its request. For example, It might happen that = PCE send a same request twice or RPL's request can't be serviced. AM I right? Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Raghuram Sudha= akar (rsudhaak) Sent: Thursday, August 15, 2013 9:07 PM To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7FEXMBX23adutwent_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Hi Qin,=

    Regarding to (2), this is= my understanding from the procedure for creating a hard cell and slotframe= . Am I missing something from 6top?

     <= /p>

    =

    Best Wishes,

    Pouria<= /p>

     <= /p>

    From: Qin Wang= [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Raghuram and Pouria,

     

    The following is my understanding.

     

    (1) Taking the assumption in Raghuram's example, i.e= . installing a route with hard cells, then, some role like PCE should exist= and take responsibility to make conflict-free. In another word, the scenar= io described in the Raghuram's example should not happen. (But, it doesn't mean a confirmation message is not nee= ded, see the following) .

     

    (2)  “MLM= E-SET-SLOTFRAME.confirm” and “MLME-SET-LINK.confirm” are = primitives of 802.15.4e. The confirmation to upper layer should come from t= he execution of 6top commands, which may related with the two 15.4e primitives, but not ex= actly same.

     

    (3) RPL is a routing protocol. It uses the TSCH sche= dule to forward packets, no matter the schedule is installed by PCE (hard c= ell) , or by some reservation protocol like RSVP (soft cell).

     

    Make sense?

     

    Thanks

    Qin

     

     

     

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Raghuram, Qin,

    Let me enter to your discussion<= o:p>

    I agree with Raghuram that when the hig= her layer call the 6top’s commands (or .requests primitives) it should be informed about the status of its request by “command re= ply” or “.confirm” primitives. The status of the “.= confirm” or “reply” can be success, failure or …

    Am I right?

    I couldn’t either find the 6top&#= 8217;s behavior upon receiving the “MLME-SET-SLOTFRAME.confirm”= or “MLME-SET-LINK.confirm” primitives that might be called by L2. Did I miss that?<= /p>

     

    Raghuram, I just have one minor comment= , in your example. I think that the RPL (L3) should use the “Create soft cell command” to ask a new cell without specifyin= g the exact cell. Because the L3 does not have enough information to ask fo= r reserving specific cell in L2. The “Create hard cell command”= should be called by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he “Create hard cell command” or RPL by calling “Create s= oft cell command” should be informed by 6top about the status of its = request. For example, It might happen that PCE send a same request twice or RPL’s request can’t be serviced. =

    AM I right?

     

    Pouria.     

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

     

    HI Qin,

    The conflicts I am referring to are -

     

    Consdiering multihop communication and hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68=
    2. But another route 2 requires node A to listen on slot 35. = ;

    There may be other such conflicts that we may need to= resolve.

     

    -raghuram

     

     

    Hi Raghuram,

     

    I totally agree to your approach to define the flow i= nformation to L3.

     

    Regarding to your question, can you explain more abou= t:

    (1) from nodeA to nodeB is one hop or multi-hop?

    (2) installing the route with hard cells or soft cell= s?

    (3) what "conflict during route installation&quo= t; mean? what kind of conflict?

     

    Thanks

    Qin

     

     

     

    On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar = (rsudhaak) <rsud= haak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of thought. I agree = with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain informatio= n from 6top. Obviously, 6top will expose these interfaces in its standard i= mplementation.

     

    Do you think finding the common requirements from 6to= p to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

     

    The different flows you have identified is perfect.&n= bsp;

    (1) The flows from 6top -> L2 have been addressed = quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements of PCE, RPL, (p= robably v6ND) in terms of parameters required for route computation to define the general requirements for flows between L3 and 6top. In the d= raft, you have already addressed some RPL specific primitives like control = message delivery. I think this should go in the RPL specific part. We defin= e primitives to expose parameters required by L3 to perform route computation in the general flows. For e.g.= L2 neighbor list, link quality to each neighbor. We need to specify the me= ssage format that needs to used by L3 to obtain this info.

    (3) We will also need 6top->L3 flows to be defined= . For e.g., in the RPL case,  GET_RPL_PARENT will be one such flow as 6top needs to provide the primitive GET_TIMING_PARENT = in the L2->6top flow. A similar primitive needs to be there for PCE.

     

    (Note: when I say L2 -> 6top flow, I mean L2 is th= e data requestor entity and 6top is the data provider. This is my own convention and hence the clarification)

     

    Another critical part I want to get your opinions on = is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

     

     

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

     

    Hi Raghuram,

     

    Sorry for the late response. It is welcome for you to= add flow information if necessary.

     

    Just one thing I want to understand more clearly. I t= hink 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct? 

     

    In this sense, we should separate the general flow in= formation to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

     

    (1) flow information with L2, i.e. TSCH

    (2) general flow information with upper layer, may be= L3 or L2.5

    (3) flow information with specific upper layer protoc= ol like RPL.

     

    What do you think?

     

    Qin 

     

     

     

     

     

     

     

     

     

     

     

     

    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (= rsudhaak) <rsudh= aak@cisco.com> wrote:

    Ok. 

     

    Qin, if you are OK I can add the flow information spe= cific to RPL. 

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

     

    Hi Raghuram,

    I let Qin answer as she is the main author. My opinio= n is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

     

    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (= rsudhaak) <rsudh= aak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some information that needs t= o be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin'= s draft. I wanted to check with you guys if you want to add to the same doc= ument or split it into a separate RFC. When I say split into separate RFC, =  what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information abou= t L2 to 6top. I could add more about the RPL to 6top is its OK..

     

    -raghuram

     

     

     

     

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qinwang@berkeley.edu Fri Aug 16 05:04:44 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B7E5211E811E for <6tsch@ietfa.amsl.com>; Fri, 16 Aug 2013 05:04:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.916 X-Spam-Level: X-Spam-Status: No, score=-2.916 tagged_above=-999 required=5 tests=[AWL=0.060, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Nss-udmbh+7h for <6tsch@ietfa.amsl.com>; Fri, 16 Aug 2013 05:04:39 -0700 (PDT) Received: from mail-vb0-f47.google.com (mail-vb0-f47.google.com [209.85.212.47]) by ietfa.amsl.com (Postfix) with ESMTP id 1C5AC11E8110 for <6tsch@ietf.org>; Fri, 16 Aug 2013 05:04:38 -0700 (PDT) Received: by mail-vb0-f47.google.com with 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<76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> Date: Fri, 16 Aug 2013 20:04:36 +0800 Message-ID: From: Qin Wang To: "P.Zand@utwente.nl" Content-Type: multipart/related; boundary=001a11c391befda0ab04e40f6449 Cc: "Raghuram Sudhaakar \(rsudhaak\)" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Aug 2013 12:04:44 -0000 --001a11c391befda0ab04e40f6449 Content-Type: multipart/alternative; boundary=001a11c391befda0a804e40f6448 --001a11c391befda0a804e40f6448 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pouria, It is the process to create a hard cell and slotframe. You see, =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usual= ly is one of factors to generate the confirmation message to higher layer. In another word, when the status returned by =93MLME-SET-SLOTFRAME.confirm=94= or =93MLME-SET-LINK.confirm=94 is False, the status reported from 6top to high= er layer must be False. But, there may be some other factors also making the status False. Make sense? Qin On Fri, Aug 16, 2013 at 7:44 AM, wrote: > Hi Qin,**** > > Regarding to (2), this is my understanding from the procedure for creatin= g > a hard cell and slotframe. Am I missing something from 6top?**** > > ** ** > > **** > > Best Wishes,**** > > Pouria**** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Friday, August 16, 2013 12:32 AM > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > ** ** > > Hi Raghuram and Pouria,**** > > ** ** > > The following is my understanding.**** > > ** ** > > (1) Taking the assumption in Raghuram's example, i.e. installing a route > with hard cells, then, some role like PCE should exist and take > responsibility to make conflict-free. In another word, the scenario > described in the Raghuram's example should not happen. (But, it doesn't > mean a confirmation message is not needed, see the following) .**** > > ** ** > > (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are > primitives of 802.15.4e. The confirmation to upper layer should come from > the execution of 6top commands, which may related with the two 15.4e > primitives, but not exactly same.**** > > ** ** > > (3) RPL is a routing protocol. It uses the TSCH schedule to forward > packets, no matter the schedule is installed by PCE (hard cell) , or by > some reservation protocol like RSVP (soft cell).**** > > ** ** > > Make sense?**** > > ** ** > > Thanks**** > > Qin**** > > ** ** > > **** > > ** ** > > On Fri, Aug 16, 2013 at 5:52 AM, wrote:**** > > Hi Raghuram, Qin,**** > > Let me enter to your discussion**** > > I agree with Raghuram that when the higher layer call the 6top=92s comman= ds > (or .requests primitives) it should be informed about the status of its > request by =93command reply=94 or =93.confirm=94 primitives. The status o= f the > =93.confirm=94 or =93reply=94 can be success, failure or =85**** > > Am I right?**** > > I couldn=92t either find the 6top=92s behavior upon receiving the > =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitive= s that > might be called by L2. Did I miss that?**** > > **** > > Raghuram, I just have one minor comment, in your example. I think that th= e > RPL (L3) should use the =93Create soft cell command=94 to ask a new cell > without specifying the exact cell. Because the L3 does not have enough > information to ask for reserving specific cell in L2. The =93Create hard = cell > command=94 should be called by the one who has the global knowledge on > network schedules, like PCE. However, I agree that the PCE by calling the > =93Create hard cell command=94 or RPL by calling =93Create soft cell comm= and=94 > should be informed by 6top about the status of its request. For example, = It > might happen that PCE send a same request twice or RPL=92s request can=92= t be > serviced. **** > > AM I right?**** > > **** > > Pouria. **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Raghuram Sudhaakar (rsudhaak) > *Sent:* Thursday, August 15, 2013 9:07 PM > *To:* Qin Wang > *Cc:* 6tsch@ietf.org > *Subject:* Re: [6tsch] Message flows**** > > **** > > HI Qin,**** > > The conflicts I am referring to are -**** > > **** > > Consdiering multihop communication and hard-cells**** > > 1. Route 1 requires a particular set of slots to be setup. Say node A > must listen on slot number 11, 34, 65 and Tx on 13, 35, 68**** > 2. But another route 2 requires node A to listen on slot 35. **** > > There may be other such conflicts that we may need to resolve.**** > > **** > > -raghuram**** > > **** > > **** > > Hi Raghuram, **** > > **** > > I totally agree to your approach to define the flow information to L3.***= * > > **** > > Regarding to your question, can you explain more about:**** > > (1) from nodeA to nodeB is one hop or multi-hop?**** > > (2) installing the route with hard cells or soft cells?**** > > (3) what "conflict during route installation" mean? what kind of conflict= ? > **** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Qin,**** > > I have pretty much the same line of thought. I agree with the point that > 6top is independent from L3. What we are trying to do is define what L3 > will need to implement to obtain information from 6top. Obviously, 6top > will expose these interfaces in its standard implementation.**** > > **** > > Do you think finding the common requirements from 6top to L3 flows betwee= n > RPL and PCE is a good place to start? I am sure there are going to be som= e > specific requirements for each but they can be added as PCE or RPL specif= ic > primitives. I am not suggesting that we implement specific primitives for > every L3 protocol, but once we cover RPL and PCE I think we will satisfy > the requirements of most L3s.**** > > **** > > The different flows you have identified is perfect. **** > > (1) The flows from 6top -> L2 have been addressed quite extensively in th= e > draft already. There are a few flows from L2 -> 6top that have to be > addressed. GET_*TIMING_P*ARENT for e..g.**** > > (2) I would consider the requirements of PCE, RPL, (probably v6ND) in > terms of parameters required for route computation to define the general > requirements for flows between L3 and 6top. In the draft, you have alread= y > addressed some RPL specific primitives like control message delivery. I > think this should go in the RPL specific part. We define primitives to > expose parameters required by L3 to perform route computation in the > general flows. For e.g. L2 neighbor list, link quality to each neighbor. = We > need to specify the message format that needs to used by L3 to obtain thi= s > info.**** > > (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL > case, GET_*RPL_*PARENT will be one such flow as 6top needs to provide > the primitive GET_*TIMING_*PARENT in the L2->6top flow. A similar > primitive needs to be there for PCE.**** > > **** > > (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity > and 6top is the data provider. This is my own convention and hence the > clarification)**** > > **** > > Another critical part I want to get your opinions on is the following. We > have decided that irrespective of L3 (PCE or RPL) a node A will initiate > route installation request when it has data to send to node B. In this ca= se > -**** > > 1. How do resolve conflict during route installation? L3 computes a > route and send it over to 6top. Which in turn converts it to slot > reservations using the 6top -> L2 primitives in the slot frame. What i= f > there is a conflict during this slot reservation? What are the message= s > that will inform L3 and the node that route installation failed? This = must > also cause L3 to recompute its route.**** > 2. Then we have to ask, does 6top provide a mechanism to inform L3 > about failure and obtain a recomputed route (i.e.) perform n number of > retries. Or just fail after one try and leave it to the node to reinit= iate > a route request. **** > > -raghuram**** > > **** > > **** > > *From: *Qin Wang > *Date: *Thursday, August 15, 2013 6:00 AM > *To: *raghuram sudhaakar > *Cc: *"xvilajosana@eecs.berkeley.edu" > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram, **** > > **** > > Sorry for the late response. It is welcome for you to add flow informatio= n > if necessary.**** > > **** > > Just one thing I want to understand more clearly. I think 6top is a > relatively independent sublayer from upper layer. RPL is used as upper > layer in the first step, but, just one kind of upper layers in the future= . > Correct? **** > > **** > > In this sense, we should separate the general flow information to upper > layer and the specific flow information to RPL. Then, can we organize the > flow information related to 6top in this way?**** > > **** > > (1) flow information with L2, i.e. TSCH**** > > (2) general flow information with upper layer, may be L3 or L2.5**** > > (3) flow information with specific upper layer protocol like RPL.**** > > **** > > What do you think?**** > > **** > > Qin **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Ok. **** > > **** > > Qin, if you are OK I can add the flow information specific to RPL. **** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: *"xvilajosana@eecs.berkeley.edu" > > *Date: *Wednesday, August 14, 2013 2:32 PM > *To: *raghuram sudhaakar > *Cc: *Qin Wang > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram,**** > > I let Qin answer as she is the main author. My opinion is that by now we > keep the document as a single file but we separate the two message flows. > IMHO, if you have information to add it is more than welcome! > > X**** > > **** > > On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Xavi, Qin,**** > > I believe that there is some information that needs to be added to the > message flows that will occur between L3 -> 6top and L2 -> 6top, in > addition to what is already there in Qin's draft. I wanted to check with > you guys if you want to add to the same document or split it into a > separate RFC. When I say split into separate RFC, what I mean is, L3 to > 6top is one RFC and L2 to 6top is another. The current draft has a lot of > information about L2 to 6top. I could add more about the RPL to 6top is i= ts > OK..**** > > **** > > -raghuram**** > > **** > > **** > > **** > > ** ** > --001a11c391befda0a804e40f6448 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pouria,

    It is the process to create = a hard cell and slotframe. You see,=A0=A0=93MLME-SET= -SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 generates confirmatio= n from L2, which usually is one of factors to generate the confirmation mes= sage to higher layer. In another word, when the status returned by=A0=A0=93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-= LINK.confirm=94 is False, the status reported from 6top to higher layer mus= t be False. But, there may be some other factors also making the status Fal= se.

    Make sense?

    Qin


    On Fri, Aug 16, 2013 at 7:44 AM, &= lt;P.Zand@utwente.nl= > wrote:

    Hi Qin,

    Regarding to (2), this is= my understanding from the procedure for creating a hard cell and slotframe= . Am I missing something from 6top?

    =A0<= /p>

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Raghuram and Pouria,

    =A0

    The following is my understanding.

    =A0

    (1) Taking the assumption in Raghuram's example,= i.e. installing a route with hard cells, then, some role like PCE should e= xist and take responsibility to make conflict-free. In another word, the sc= enario described in the Raghuram's example should not happen. (But, it doesn't mean a confirmation message is not= needed, see the following) .

    =A0

    (2)=A0=A0=93MLME-SET-SLOT= FRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4= e. The confirmation to upper layer should come from the execution of 6top commands, which may related with the two 15.4e primitives, but not ex= actly same.

    =A0

    (3) RPL is a routing protocol. It uses the TSCH sche= dule to forward packets, no matter the schedule is installed by PCE (hard c= ell) , or by some reservation protocol like RSVP (soft cell).=

    =A0

    Make sense?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:=

    Hi Raghuram, Qin,<= u>

    Let me enter to your disc= ussion

    I agree with Raghuram tha= t when the higher layer call the 6top=92s commands (or .requests primitives= ) it should be informed about the status of its request by =93command reply= =94 or =93.confirm=94 primitives. The status of the =93.confirm=94 or =93re= ply=94 can be success, failure or =85

    Am I right?=

    I couldn=92t either find = the 6top=92s behavior upon receiving the =93MLME-SET-SLOTFRAME.confirm=94 o= r =93MLME-SET-LINK.confirm=94 primitives that might be called by L2. Did I miss that?

    =A0<= /p>

    Raghuram, I just have one= minor comment, in your example. I think that the RPL (L3) should use the =93Create soft cell command=94 to ask a new cell without specifying the ex= act cell. Because the L3 does not have enough information to ask for reserv= ing specific cell in L2. The =93Create hard cell command=94 should be calle= d by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he =93Create hard cell command=94 or RPL by calling =93Create soft cell com= mand=94 should be informed by 6top about the status of its request. For exa= mple, It might happen that PCE send a same request twice or RPL=92s request can=92t be serviced.

    AM I right?=

    =A0<= /p>

    Pouria.=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

    =A0

    HI Qin,

    The conflicts I am referring to are -

    =A0

    Consdiering multihop communication and = hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But another route 2 requires node A to listen on slot 35.=A0

    There may be other such conflicts that = we may need to resolve.

    =A0

    -raghuram

    =A0

    =A0

    Hi Raghuram,

    =A0

    I totally agree to your approach to def= ine the flow information to L3.

    =A0

    Regarding to your question, can you exp= lain more about:

    (1) from nodeA to nodeB is one hop or m= ulti-hop?

    (2) installing the route with hard cell= s or soft cells?

    (3) what "conflict during route in= stallation" mean? what kind of conflict?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 10:16 PM, Raghu= ram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of tho= ught. I agree with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain informatio= n from 6top. Obviously, 6top will expose these interfaces in its standard i= mplementation.

    =A0

    Do you think finding the common require= ments from 6top to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

    =A0

    The different flows you have identified= is perfect.=A0

    (1) The flows from 6top -> L2 have b= een addressed quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements o= f PCE, RPL, (probably v6ND) in terms of parameters required for route compu= tation to define the general requirements for flows between L3 and 6top. In the d= raft, you have already addressed some RPL specific primitives like control = message delivery. I think this should go in the RPL specific part. We defin= e primitives to expose parameters required by L3 to perform route computation in the general flows. For e.g.= L2 neighbor list, link quality to each neighbor. We need to specify the me= ssage format that needs to used by L3 to obtain this info.=

    (3) We will also need 6top->L3 flows= to be defined. For e.g., in the RPL case, =A0GET_RPL_PARENT will be= one such flow as 6top needs to provide the primitive GET_TIMING_PARENT = in the L2->6top flow. A similar primitive needs to be there for PCE.

    =A0

    (Note: when I say L2 -> 6top flow, I= mean L2 is the data requestor entity and 6top is the data provider. This i= s my own convention and hence the clarification)

    =A0

    Another critical part I want to get you= r opinions on is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

    =A0

    =A0

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

    =A0

    Hi Raghuram,

    =A0

    Sorry for the late response. It is welc= ome for you to add flow information if necessary.

    =A0

    Just one thing I want to understand mor= e clearly. I think 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct?=A0

    =A0

    In this sense, we should separate the g= eneral flow information to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

    =A0

    (1) flow information with L2, i.e. TSCH=

    (2) general flow information with upper= layer, may be L3 or L2.5

    (3) flow information with specific uppe= r layer protocol like RPL.

    =A0

    What do you think?=

    =A0

    Qin=A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 6:10 AM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Ok.=A0

    =A0

    Qin, if you are OK I can add the flow i= nformation specific to RPL.=A0

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

    =A0

    Hi Raghu= ram,

    I let Qin answer as she is the main aut= hor. My opinion is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

    =A0

    On Wed, Aug 14, 2013 at 1:42 PM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some informatio= n that needs to be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin&= #39;s draft. I wanted to check with you guys if you want to add to the same= document or split it into a separate RFC. When I say split into separate R= FC, =A0what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information abou= t L2 to 6top. I could add more about the RPL to 6top is its OK..<= /u>

    =A0<= /p>

    -raghuram

    =A0

    =A0

    =A0

    =A0


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16 Aug 2013 06:24:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.068 X-Spam-Level: X-Spam-Status: No, score=0.068 tagged_above=-999 required=5 tests=[AWL=-0.429, BAYES_00=-2.599, EXTRA_MPART_TYPE=1, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TxF00DJ5Ob56 for <6tsch@ietfa.amsl.com>; Fri, 16 Aug 2013 06:24:20 -0700 (PDT) Received: from EXEDGE01.ad.utwente.nl (exedge01.ad.utwente.nl [130.89.5.48]) by ietfa.amsl.com (Postfix) with ESMTP id 54F7311E8134 for <6tsch@ietf.org>; Fri, 16 Aug 2013 06:24:19 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE01.ad.utwente.nl (130.89.5.48) with Microsoft SMTP Server (TLS) id 14.2.328.9; Fri, 16 Aug 2013 15:24:21 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Fri, 16 Aug 2013 15:24:18 +0200 From: To: Thread-Topic: Message flows Thread-Index: AQHOmS7T2+M8VWnoB0iALAow4p1lsJmVjRCA//+VLYCAAW4AgP//n/gAgACPZID//8GzAAAJ+CqA///pcYD//8tEoIABF+YA///KPoA= Date: Fri, 16 Aug 2013 13:24:17 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/related; boundary="_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136BEXMBX23adutwent_"; type="multipart/alternative" MIME-Version: 1.0 Cc: rsudhaak@cisco.com, 6tsch@ietf.org Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Aug 2013 13:24:27 -0000 --_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136BEXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136BEXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136BEXMBX23adutwent_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Qin, I completely agree with you that the status of the report/confirm form 6top= to higher layer might be changed by other factors as well. My point is tha= t, one of those factors, is the status of ".confirm" primitives received fo= rm L2. I think in 6top, we have to add them to the list of the factors that= effect on the reply/confirm to higher layer. Am I right? Regarding to (1), I think, when the 6top commands/primitives are called by = higher layer (either by PCE, potential signaling protocol, or temporary by = RPL in the lack of signaling protocol) we have to send a ".confirm" to info= rm them about the status of their requests. Am I right? I would say that in= some cases we might need to send the confirmation to PCE with the FAIL sta= tus. Regarding to (3), I agree that the signaling protocol and PCE should call t= he cell creation commands/primitives. Do you agree that 6top should be inde= pendent form the higher layer that has called its primitives/command? Is th= ere any limitation that in the lack of signaling protocol, the RPL can't ca= ll some of the 6top' management commands/primitives (e.g. Soft cell creatio= n)? In this case, we might need to reply to RPL, by SUCCESS or FAIL status?= Did I miss anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 2:05 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Pouria, It is the process to create a hard cell and slotframe. You see, "MLME-SET-= SLOTFRAME.confirm" and "MLME-SET-LINK.confirm" generates confirmation from = L2, which usually is one of factors to generate the confirmation message to= higher layer. In another word, when the status returned by "MLME-SET-SLOT= FRAME.confirm" or "MLME-SET-LINK.confirm" is False, the status reported fro= m 6top to higher layer must be False. But, there may be some other factors = also making the status False. Make sense? Qin On Fri, Aug 16, 2013 at 7:44 AM, > wrote: Hi Qin, Regarding to (2), this is my understanding from the procedure for creating = a hard cell and slotframe. Am I missing something from 6top? [cid:image001.jpg@01CE9A94.4F0618C0] Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 12:32 AM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Raghuram and Pouria, The following is my understanding. (1) Taking the assumption in Raghuram's example, i.e. installing a route wi= th hard cells, then, some role like PCE should exist and take responsibilit= y to make conflict-free. In another word, the scenario described in the Rag= huram's example should not happen. (But, it doesn't mean a confirmation mes= sage is not needed, see the following) . (2) "MLME-SET-SLOTFRAME.confirm" and "MLME-SET-LINK.confirm" are primitive= s of 802.15.4e. The confirmation to upper layer should come from the execut= ion of 6top commands, which may related with the two 15.4e primitives, but = not exactly same. (3) RPL is a routing protocol. It uses the TSCH schedule to forward packets= , no matter the schedule is installed by PCE (hard cell) , or by some reser= vation protocol like RSVP (soft cell). Make sense? Thanks Qin On Fri, Aug 16, 2013 at 5:52 AM, > wrote: Hi Raghuram, Qin, Let me enter to your discussion I agree with Raghuram that when the higher layer call the 6top's commands (= or .requests primitives) it should be informed about the status of its requ= est by "command reply" or ".confirm" primitives. The status of the ".confir= m" or "reply" can be success, failure or ... Am I right? I couldn't either find the 6top's behavior upon receiving the "MLME-SET-SLO= TFRAME.confirm" or "MLME-SET-LINK.confirm" primitives that might be called = by L2. Did I miss that? Raghuram, I just have one minor comment, in your example. I think that the = RPL (L3) should use the "Create soft cell command" to ask a new cell withou= t specifying the exact cell. Because the L3 does not have enough informatio= n to ask for reserving specific cell in L2. The "Create hard cell command" = should be called by the one who has the global knowledge on network schedul= es, like PCE. However, I agree that the PCE by calling the "Create hard cel= l command" or RPL by calling "Create soft cell command" should be informed = by 6top about the status of its request. For example, It might happen that = PCE send a same request twice or RPL's request can't be serviced. AM I right? Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Raghuram Sudha= akar (rsudhaak) Sent: Thursday, August 15, 2013 9:07 PM To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136BEXMBX23adutwent_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Qin,

     <= /p>

    I completely agree with y= ou that the status of the report/confirm form 6top to higher layer might be= changed by other factors as well. My point is that, one of those factors, is the status of “.confirm” primitives recei= ved form L2. I think in 6top, we have to add them to the list of the factor= s that effect on the reply/confirm to higher layer. Am I right?  

     <= /p>

    Regarding to (1), I think= , when the 6top commands/primitives are called by higher layer (either by P= CE, potential signaling protocol, or temporary by RPL in the lack of signaling protocol) we have to send a “.confirm” t= o inform them about the status of their requests. Am I right? I would say t= hat in some cases we might need to send the confirmation to PCE with the FA= IL status.

     <= /p>

    Regarding to (3), I agree= that the signaling protocol and PCE should call the cell creation commands= /primitives. Do you agree that 6top should be independent form the higher layer that has called its primitives/command? Is there any= limitation that in the lack of signaling protocol, the RPL can’t cal= l some of the 6top’ management commands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

     <= /p>

    Pouria<= /p>

     <= /p>

    From: Qin Wang= [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Pouria,

     

    It is the process to create a hard cell and slotfram= e. You see,  “MLME-SET-SLOTFRAME= .confirm” and “MLME-SET-LINK.confirm” generates confirmat= ion from L2, which usually is one of factors to generate the confirmation message to higher l= ayer. In another word, when the status returned by  “MLME-S= ET-SLOTFRAME.confirm” or “MLME-SET-LINK.confirm” is False= , the status reported from 6top to higher layer must be False. But, there may be some other factors also making the status False.<= /o:p>

     

    Make sense?

     

    Qin

     

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    Regarding to (2), this is my understand= ing from the procedure for creating a hard cell and slotframe. Am I missing something from 6top?

     

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak);     6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Raghuram and Pouria,

     

    The following is my understanding.

     

    (1) Taking the assumption in Raghuram's example, i.e. installing a= route with hard cells, then, some role like PCE should exist and take resp= onsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should not = happen. (But, it doesn't mean a confirmation message is not needed, see the= following) .

     

    (2)  “MLME-SET-SLOTFRAM= E.confirm” and “MLME-SET-LINK.confirm” are primitives of = 802.15.4e. The confirmation to upper layer should come from the execution of 6top commands, which may = related with the two 15.4e primitives, but not exactly same.

     

    (3) RPL is a routing protocol. It uses the TSCH schedule to forwar= d packets, no matter the schedule is installed by PCE (hard cell) , or by s= ome reservation protocol like RSVP (soft cell).

     

    Make sense?

     

    Thanks

    Qin

     

     

     

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Raghuram, Qin,

    Let me enter to your discussion<= o:p>

    I agree with Raghuram that when the hig= her layer call the 6top’s commands (or .requests primitives) it should be informed about the status of its request by “command re= ply” or “.confirm” primitives. The status of the “.= confirm” or “reply” can be success, failure or …

    Am I right?

    I couldn’t either find the 6top&#= 8217;s behavior upon receiving the “MLME-SET-SLOTFRAME.confirm”= or “MLME-SET-LINK.confirm” primitives that might be called by L2. Did I miss that?<= /p>

     

    Raghuram, I just have one minor comment= , in your example. I think that the RPL (L3) should use the “Create soft cell command” to ask a new cell without specifyin= g the exact cell. Because the L3 does not have enough information to ask fo= r reserving specific cell in L2. The “Create hard cell command”= should be called by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he “Create hard cell command” or RPL by calling “Create s= oft cell command” should be informed by 6top about the status of its = request. For example, It might happen that PCE send a same request twice or RPL’s request can’t be serviced. =

    AM I right?

     

    Pouria.     

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

     

    HI Qin,

    The conflicts I am referring to are -

     

    Consdiering multihop communication and hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68=
    2. But another route 2 requires node A to listen on slot 35. = ;

    There may be other such conflicts that we may need to= resolve.

     

    -raghuram

     

     

    Hi Raghuram,

     

    I totally agree to your approach to define the flow i= nformation to L3.

     

    Regarding to your question, can you explain more abou= t:

    (1) from nodeA to nodeB is one hop or multi-hop?

    (2) installing the route with hard cells or soft cell= s?

    (3) what "conflict during route installation&quo= t; mean? what kind of conflict?

     

    Thanks

    Qin

     

     

     

    On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar = (rsudhaak) <rsud= haak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of thought. I agree = with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain informatio= n from 6top. Obviously, 6top will expose these interfaces in its standard i= mplementation.

     

    Do you think finding the common requirements from 6to= p to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

     

    The different flows you have identified is perfect.&n= bsp;

    (1) The flows from 6top -> L2 have been addressed = quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements of PCE, RPL, (p= robably v6ND) in terms of parameters required for route computation to define the general requirements for flows between L3 and 6top. In the d= raft, you have already addressed some RPL specific primitives like control = message delivery. I think this should go in the RPL specific part. We defin= e primitives to expose parameters required by L3 to perform route computation in the general flows. For e.g.= L2 neighbor list, link quality to each neighbor. We need to specify the me= ssage format that needs to used by L3 to obtain this info.

    (3) We will also need 6top->L3 flows to be defined= . For e.g., in the RPL case,  GET_RPL_PARENT will be one such flow as 6top needs to provide the primitive GET_TIMING_PARENT = in the L2->6top flow. A similar primitive needs to be there for PCE.

     

    (Note: when I say L2 -> 6top flow, I mean L2 is th= e data requestor entity and 6top is the data provider. This is my own convention and hence the clarification)

     

    Another critical part I want to get your opinions on = is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

     

     

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

     

    Hi Raghuram,

     

    Sorry for the late response. It is welcome for you to= add flow information if necessary.

     

    Just one thing I want to understand more clearly. I t= hink 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct? 

     

    In this sense, we should separate the general flow in= formation to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

     

    (1) flow information with L2, i.e. TSCH

    (2) general flow information with upper layer, may be= L3 or L2.5

    (3) flow information with specific upper layer protoc= ol like RPL.

     

    What do you think?

     

    Qin 

     

     

     

     

     

     

     

     

     

     

     

     

    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (= rsudhaak) <rsudh= aak@cisco.com> wrote:

    Ok. 

     

    Qin, if you are OK I can add the flow information spe= cific to RPL. 

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

     

    Hi Raghuram,

    I let Qin answer as she is the main author. My opinio= n is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

     

    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (= rsudhaak) <rsudh= aak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some information that needs t= o be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin'= s draft. I wanted to check with you guys if you want to add to the same doc= ument or split it into a separate RFC. When I say split into separate RFC, =  what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information abou= t L2 to 6top. I could add more about the RPL to 6top is its OK..

     

    -raghuram

     

     

     

     

     

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l=88559; q=dns/txt; s=iport; t=1376664812; x=1377874412; h=from:to:cc:subject:date:message-id:in-reply-to: mime-version; bh=H/RwSiFGeEO3kg99WVJ+guGak88VDk5u/zBXST1hc+A=; b=e0KTu13Xe5Kf3xgGmhn6eMQoCVK+b5hVSZl0KQy9OIkWmHIaG6weAK+Q HrqmDV/hM3XuNXeuOs+GsClg9Yr+YloG8fVHgpurN7x5ncz6bAbJgOcGs QFvgO0UsDtjkTT7+rLEVyk1IAEc9vtFVRe/re8ZTebh1GvICS2NCjnJ00 A=; X-Files: image001.jpg : 18869 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AlwFAC48DlKtJV2c/2dsb2JhbABRCg6CNEQ1Ub8bgScWdIIkAQEBBAUVCwIGAUsSAQgRAwEBAQYBAQECCA4BBgkVAQwCDBQJCAIEAQ0EAQYCBogCuXuPCYEWBgcJChEGAQICAoMVdwOQFoEuAVmBLogJjWSCXT+BaCQe X-IronPort-AV: E=Sophos;i="4.89,895,1367971200"; d="jpg'145?scan'145,208,217,145";a="248151360" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by rcdn-iport-8.cisco.com with ESMTP; 16 Aug 2013 14:53:28 +0000 Received: from xhc-aln-x04.cisco.com (xhc-aln-x04.cisco.com [173.36.12.78]) by rcdn-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id r7GErSp5026953 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 16 Aug 2013 14:53:28 GMT Received: from xmb-rcd-x04.cisco.com ([169.254.8.180]) by xhc-aln-x04.cisco.com ([173.36.12.78]) with mapi id 14.02.0318.004; Fri, 16 Aug 2013 09:53:28 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: "P.Zand@utwente.nl" , "qinwang@berkeley.edu" Thread-Topic: Message flows Thread-Index: AQHOmpBd2+M8VWnoB0iALAow4p1lsA== Date: Fri, 16 Aug 2013 14:53:27 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57@xmb-rcd-x04.cisco.com> In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.21.80.183] Content-Type: multipart/mixed; boundary="_004_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57xmbrcdx04ciscoc_" MIME-Version: 1.0 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Aug 2013 14:53:40 -0000 --_004_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57xmbrcdx04ciscoc_ Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57xmbrcdx04ciscoc_" --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57xmbrcdx04ciscoc_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Qin, Pouria, The message flow diagram idescribes the scenario perfectly. I think it shou= ld go in the document or at least in an appendix to the document. I would m= ake one change though, instead of have two command from L3 to 6top (create = hard cell, create soft cell) we can have only one command (install route) a= nd depending on the type of L3 6top decides whether to create a hard or so= ft cell. This will help 6top ensure that there are minimal conflicts (as po= inted out already in this discussion) and in future we may be able to work = with PCE and RPL simultaneously. This scenario of working with multiple L3'= s may occur when there are multiple overlay/logical networks are being crea= ted over the same physical network. The only caveat to this though is that we need to define a command from L3 = to 6top that will help 6top identify the L3 protocol. Or we could also incl= ude a L3 protocol type field in every message from L3 -> 6top. Qin mentioned that the status returned by L2 for the the slot installation = process can be forwarded to L3 by 6top but in some cases we may there may b= e other factors also. I thought about this but I can't identify what other = factors might affect the reply the 6top will send to L3. Can you please ide= ntify what factors you had in mind. I think it is important we nail down th= is flow very clearly and take care of all edge cases. -raghuram From: "P.Zand@utwente.nl" > Date: Friday, August 16, 2013 6:24 AM To: "qinwang@berkeley.edu" > Cc: raghuram sudhaakar >, "6t= sch@ietf.org" <6tsch@ietf.org= > Subject: RE: Message flows Qin, I completely agree with you that the status of the report/confirm form 6top= to higher layer might be changed by other factors as well. My point is tha= t, one of those factors, is the status of =93.confirm=94 primitives receive= d form L2. I think in 6top, we have to add them to the list of the factors = that effect on the reply/confirm to higher layer. Am I right? Regarding to (1), I think, when the 6top commands/primitives are called by = higher layer (either by PCE, potential signaling protocol, or temporary by = RPL in the lack of signaling protocol) we have to send a =93.confirm=94 to = inform them about the status of their requests. Am I right? I would say tha= t in some cases we might need to send the confirmation to PCE with the FAIL= status. Regarding to (3), I agree that the signaling protocol and PCE should call t= he cell creation commands/primitives. Do you agree that 6top should be inde= pendent form the higher layer that has called its primitives/command? Is th= ere any limitation that in the lack of signaling protocol, the RPL can=92t = call some of the 6top=92 management commands/primitives (e.g. Soft cell cre= ation)? In this case, we might need to reply to RPL, by SUCCESS or FAIL sta= tus? Did I miss anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 2:05 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Pouria, It is the process to create a hard cell and slotframe. You see, =93MLME-SE= T-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 generates confirmati= on from L2, which usually is one of factors to generate the confirmation me= ssage to higher layer. In another word, when the status returned by =93MLM= E-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 is False, the sta= tus reported from 6top to higher layer must be False. But, there may be som= e other factors also making the status False. Make sense? Qin On Fri, Aug 16, 2013 at 7:44 AM, > wrote: Hi Qin, Regarding to (2), this is my understanding from the procedure for creating = a hard cell and slotframe. Am I missing something from 6top? [cid:image001.jpg@01CE9A94.4F0618C0] Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 12:32 AM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Raghuram and Pouria, The following is my understanding. (1) Taking the assumption in Raghuram's example, i.e. installing a route wi= th hard cells, then, some role like PCE should exist and take responsibilit= y to make conflict-free. In another word, the scenario described in the Rag= huram's example should not happen. (But, it doesn't mean a confirmation mes= sage is not needed, see the following) . (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are p= rimitives of 802.15.4e. The confirmation to upper layer should come from th= e execution of 6top commands, which may related with the two 15.4e primitiv= es, but not exactly same. (3) RPL is a routing protocol. It uses the TSCH schedule to forward packets= , no matter the schedule is installed by PCE (hard cell) , or by some reser= vation protocol like RSVP (soft cell). Make sense? Thanks Qin On Fri, Aug 16, 2013 at 5:52 AM, > wrote: Hi Raghuram, Qin, Let me enter to your discussion I agree with Raghuram that when the higher layer call the 6top=92s commands= (or .requests primitives) it should be informed about the status of its re= quest by =93command reply=94 or =93.confirm=94 primitives. The status of th= e =93.confirm=94 or =93reply=94 can be success, failure or =85 Am I right? I couldn=92t either find the 6top=92s behavior upon receiving the =93MLME-S= ET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitives that migh= t be called by L2. Did I miss that? Raghuram, I just have one minor comment, in your example. I think that the = RPL (L3) should use the =93Create soft cell command=94 to ask a new cell wi= thout specifying the exact cell. Because the L3 does not have enough inform= ation to ask for reserving specific cell in L2. The =93Create hard cell com= mand=94 should be called by the one who has the global knowledge on network= schedules, like PCE. However, I agree that the PCE by calling the =93Creat= e hard cell command=94 or RPL by calling =93Create soft cell command=94 sho= uld be informed by 6top about the status of its request. For example, It mi= ght happen that PCE send a same request twice or RPL=92s request can=92t be= serviced. AM I right? Pouria. From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Raghuram Sudhaa= kar (rsudhaak) Sent: Thursday, August 15, 2013 9:07 PM To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57xmbrcdx04ciscoc_ Content-Type: text/html; charset="Windows-1252" Content-ID: <516FFCA22CEA544CA7DFD023A02E1233@emea.cisco.com> Content-Transfer-Encoding: quoted-printable
    Qin, Pouria,
    The message flow diag= ram idescribes the scenario perfectly. I think it should go in the document= or at least in an appendix to the document. I would make one change though= , instead of have two command from L3 to 6top (create hard cell, create soft cell) we can have only one comma= nd (install route) and depending on the type of L3 6top decides whether to = create  a hard or soft cell. This will help 6top ensure that there are= minimal conflicts (as pointed out already in this discussion) and in future we may be able to work with PCE and RPL = simultaneously. This scenario of working with multiple L3's may occur when = there are multiple overlay/logical networks are being created over the same= physical network.

    The only c= aveat to this though is that we need to define a command from L3 to 6top th= at will help 6top identify the L3 protocol. Or we could also include a L3 p= rotocol type field in every message from L3 -> 6top.

    Qin mentio= ned that the status returned by L2 for the the slot installation process ca= n be forwarded to L3 by 6top but in some cases we may there may be other fa= ctors also. I thought about this but I can't identify what other factors might affect the reply the 6top will s= end to L3. Can you please identify what factors you had in mind. I think it= is important we nail down this flow very clearly and take care of all edge= cases.

    -raghuram<= /span>

    From: "P.Zand@utwente.nl" <P.Zand@utwente.nl>
    Date: Friday, August 16, 2013 6:24 = AM
    To: "qinwang@berkeley.edu" <qinwang@berkeley.edu>
    Cc: raghuram sudhaakar <rsudhaak@cisco.com>, "6tsch@ietf.org" <6tsch@ietf.org>
    Subject: RE: Message flows

    Qin,

     

    I completely agree with you that t= he status of the report/confirm form 6top to higher layer might be changed = by other factors as well. My point is that, one of those factors, is the status of =93.confirm=94 primitives rec= eived form L2. I think in 6top, we have to add them to the list of the fact= ors that effect on the reply/confirm to higher layer. Am I right? &nbs= p;

     

    Regarding to (1), I think, when th= e 6top commands/primitives are called by higher layer (either by PCE, poten= tial signaling protocol, or temporary by RPL in the lack of signaling protocol) we have to send a =93.confirm=94= to inform them about the status of their requests. Am I right? I would say= that in some cases we might need to send the confirmation to PCE with the = FAIL status.

     

    Regarding to (3), I agree that the= signaling protocol and PCE should call the cell creation commands/primitiv= es. Do you agree that 6top should be independent form the higher layer that has called its primitives/command? = Is there any limitation that in the lack of signaling protocol, the RPL can= =92t call some of the 6top=92 management commands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

     

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Pouria,

     

    It is the process to create a hard cell and slotfram= e. You see,  =93MLME-SET-SLOTFRAME.confirm=94= and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usually is one of factors to generate the confirmation mess= age to higher layer. In another word, when the status returned by &nbs= p;=93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 is False,= the status reported from 6top to higher layer must be False. But, there may be some other factors also making the status Fals= e.

     

    Make sense?

     

    Qin

     

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    Regarding to (2), this is my understanding from = the procedure for creating a hard cell and slotframe. Am I missing something from 6top?

     

    <= /o:p>

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Raghuram and Pouria,

     

    The following is my understanding.

     

    (1) Taking the assumption in Raghuram's example, i.e. installing a= route with hard cells, then, some role like PCE should exist and take resp= onsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should not = happen. (But, it doesn't mean a confirmation message is not needed, see the= following) .

     

    (2)  =93MLME-SET-SLOTFRAME.confirm= =94 and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4e. The confirmation to upper layer should come from the execution of 6top com= mands, which may related with the two 15.4e primitives, but not exactly sam= e.

     

    (3) RPL is a routing protocol. It uses the TSCH schedule to forwar= d packets, no matter the schedule is installed by PCE (hard cell) , or by s= ome reservation protocol like RSVP (soft cell).

     

    Make sense?

     

    Thanks

    Qin

     

     

     

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Raghuram, Qin,

    Let me enter to your discussion

    I agree with Raghuram that when the higher layer= call the 6top=92s commands (or .requests primitives) it should be informed about the status of its request by =93co= mmand reply=94 or =93.confirm=94 primitives. The status of the =93.confirm= =94 or =93reply=94 can be success, failure or =85

    Am I right?

    I couldn=92t either find the 6top=92s behavior u= pon receiving the =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitives that might be called by L2. Did = I miss that?

     

    Raghuram, I just have one minor comment, in your= example. I think that the RPL (L3) should use the =93Create soft cell command=94 to ask a new cell without specifyin= g the exact cell. Because the L3 does not have enough information to ask fo= r reserving specific cell in L2. The =93Create hard cell command=94 should = be called by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by= calling the =93Create hard cell command=94 or RPL by calling =93Create sof= t cell command=94 should be informed by 6top about the status of its reques= t. For example, It might happen that PCE send a same request twice or RPL=92s request can=92t be serviced. <= o:p>

    AM I right?

     

    Pouria.     

     

    From:6ts= ch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

     

    HI Qin,

    The conflicts I am referring to are -

     

    Consdiering multihop communication and hard-cells

    1. Route= 1 requires a particular set of slots to be setup. Say node A must listen o= n slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But a= nother route 2 requires node A to listen on slot 35. 

    There may be other such conflicts that we may need to resolve.

     

    -raghuram

     

    Hi Raghuram,

     

    I totally agree to your approach to define the flow information to L3.<= /span>

     

    Regarding to your question, can you explain more about:

    (1) from nodeA to nodeB is one hop or multi-hop?

    (2) installing the route with hard cells or soft cells?

    (3) what "conflict during route installation" mean? what kind= of conflict?

     

    Thanks

    Qin

     

     

    &n= bsp;

    On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@cisco.com= > wrote:

    Qin,

    I have pretty much the same line of thought. I agree with the point tha= t 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain inform= ation from 6top. Obviously, 6top will expose these interfaces in its standa= rd implementation.

     

    Do you think finding the common requirements from 6top to L3 flows betw= een RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

     

    The different flows you have identified is perfect. 

    (1) The flows from 6top -> L2 have been addressed quite extensively = in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements of PCE, RPL, (probably v6ND) in t= erms of parameters required for route computation to define the general requirements for flows between L3 and 6t= op. In the draft, you have already addressed some RPL specific primitives l= ike control message delivery. I think this should go in the RPL specific pa= rt. We define primitives to expose parameters required by L3 to perform route computation in the general flow= s. For e.g. L2 neighbor list, link quality to each neighbor. We need to spe= cify the message format that needs to used by L3 to obtain this info.

    (3) We will also need 6top->L3 flows to be defined. For e.g., in the= RPL case,  GET_RPL_PARENT will be one such flow as 6top needs to provide the primitive GET_TIMING_PAR= ENT in the L2->6top flow. A similar primitive needs to be there for PCE.=

     

    (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor e= ntity and 6top is the data provider. This is my own convention and hence the clarification)

     

    Another critical part I want to get your opinions on is the following. = We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How d= o resolve conflict during route installation? L3 computes a route and send = it over to 6top. Which in turn converts it to slot reservations using the 6= top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then = we have to ask, does 6top provide a mechanism to inform L3 about failure an= d obtain a recomputed route (i.e.) perform n number of retries. Or just fai= l after one try and leave it to the node to reinitiate a route request.

    -raghuram

     

     

    From: Qin Wang <= qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

     

    Hi Raghuram,

     

    Sorry for the late response. It is welcome for you to add flow informat= ion if necessary.

     

    Just one thing I want to understand more clearly. I think 6top is a rel= atively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct? 

     

    In this sense, we should separate the general flow information to upper= layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

     

    (1) flow information with L2, i.e. TSCH

    (2) general flow information with upper layer, may be L3 or L2.5=

    (3) flow information with specific upper layer protocol like RPL.

     

    What do you think?

     

    Qin 

     

     

     

     

     

     

     

     

     

     

     

    &n= bsp;

    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@cisco.com&= gt; wrote:

    Ok. 

     

    Qin, if you are OK I can add the flow information specific to RPL. = ;

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

     

    Hi= Raghuram,

    I let Qin answer as she is the main author. My opinion is that by now w= e keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

    &n= bsp;

    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) <rsudhaak@cisco.com&= gt; wrote:

    Xavi, Qin,

    I believe that there is some information that needs to be added to the = message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Q= in's draft. I wanted to check with you guys if you want to add to the same = document or split it into a separate RFC. When I say split into separate RF= C,  what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information = about L2 to 6top. I could add more about the RPL to 6top is its OK..=

     

    -raghuram

     

     

     

     

     

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P.Zand@utwente.nl Fri Aug 16 08:50:38 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7FCB321F9BDB for <6tsch@ietfa.amsl.com>; Fri, 16 Aug 2013 08:50:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.122 X-Spam-Level: X-Spam-Status: No, score=0.122 tagged_above=-999 required=5 tests=[AWL=-0.375, BAYES_00=-2.599, EXTRA_MPART_TYPE=1, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gDHTSeElP7wJ for <6tsch@ietfa.amsl.com>; Fri, 16 Aug 2013 08:50:28 -0700 (PDT) Received: from EXEDGE01.ad.utwente.nl (exedge01.ad.utwente.nl [130.89.5.48]) by ietfa.amsl.com (Postfix) with ESMTP id 382CD21F99C3 for <6tsch@ietf.org>; Fri, 16 Aug 2013 08:50:26 -0700 (PDT) Received: from EXHUB02.ad.utwente.nl (130.89.4.229) by EXEDGE01.ad.utwente.nl (130.89.5.48) with Microsoft SMTP Server (TLS) id 14.2.328.9; Fri, 16 Aug 2013 17:50:27 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB02.ad.utwente.nl ([130.89.4.229]) with mapi id 14.02.0328.009; Fri, 16 Aug 2013 17:50:23 +0200 From: To: , Thread-Topic: Message flows Thread-Index: AQHOmS7T2+M8VWnoB0iALAow4p1lsJmVjRCA//+VLYCAAW4AgP//n/gAgACPZID//8GzAAAJ+CqA///pcYD//8tEoIABF+YA///KPoCAAGTvgP//z7sA Date: Fri, 16 Aug 2013 15:50:21 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA71488@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57@xmb-rcd-x04.cisco.com> In-Reply-To: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57@xmb-rcd-x04.cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/related; boundary="_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71488EXMBX23adutwent_"; type="multipart/alternative" MIME-Version: 1.0 Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Aug 2013 15:50:38 -0000 --_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71488EXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71488EXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71488EXMBX23adutwent_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Raghuram, Just one minor comment on the diagram. I intend to show a simple flow diagr= am from L2 -> 6top -> higher layer. That's why I choose the simplest comman= ds from 6top (e.g. "CREATE hardcell" and "Create Slotframe") to show the ".= confirm" flow from L2 -> 6top -> higher layer. I didn't show the other pote= ntial detailed flows for these two commands. If we intend to show the complete flow diagram of "Create Link Commands" (i= .e. "CREATE hardcell" and "CREATE softcell"), there will be more details. E= specially, for "Create softcell" command that also need the negotiation wit= h the other neighbor. But, It would be helpful if we can draw these diagram= s with ASCII text. Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Friday, August 16, 2013 4:53 PM To: Zand, P. (EWI); qinwang@berkeley.edu Cc: 6tsch@ietf.org Subject: Re: Message flows Qin, Pouria, The message flow diagram idescribes the scenario perfectly. I think it shou= ld go in the document or at least in an appendix to the document. I would m= ake one change though, instead of have two command from L3 to 6top (create = hard cell, create soft cell) we can have only one command (install route) a= nd depending on the type of L3 6top decides whether to create a hard or so= ft cell. This will help 6top ensure that there are minimal conflicts (as po= inted out already in this discussion) and in future we may be able to work = with PCE and RPL simultaneously. This scenario of working with multiple L3'= s may occur when there are multiple overlay/logical networks are being crea= ted over the same physical network. The only caveat to this though is that we need to define a command from L3 = to 6top that will help 6top identify the L3 protocol. Or we could also incl= ude a L3 protocol type field in every message from L3 -> 6top. Qin mentioned that the status returned by L2 for the the slot installation = process can be forwarded to L3 by 6top but in some cases we may there may b= e other factors also. I thought about this but I can't identify what other = factors might affect the reply the 6top will send to L3. Can you please ide= ntify what factors you had in mind. I think it is important we nail down th= is flow very clearly and take care of all edge cases. -raghuram From: "P.Zand@utwente.nl" > Date: Friday, August 16, 2013 6:24 AM To: "qinwang@berkeley.edu" > Cc: raghuram sudhaakar >, "6t= sch@ietf.org" <6tsch@ietf.org= > Subject: RE: Message flows Qin, I completely agree with you that the status of the report/confirm form 6top= to higher layer might be changed by other factors as well. My point is tha= t, one of those factors, is the status of ".confirm" primitives received fo= rm L2. I think in 6top, we have to add them to the list of the factors that= effect on the reply/confirm to higher layer. Am I right? Regarding to (1), I think, when the 6top commands/primitives are called by = higher layer (either by PCE, potential signaling protocol, or temporary by = RPL in the lack of signaling protocol) we have to send a ".confirm" to info= rm them about the status of their requests. Am I right? I would say that in= some cases we might need to send the confirmation to PCE with the FAIL sta= tus. Regarding to (3), I agree that the signaling protocol and PCE should call t= he cell creation commands/primitives. Do you agree that 6top should be inde= pendent form the higher layer that has called its primitives/command? Is th= ere any limitation that in the lack of signaling protocol, the RPL can't ca= ll some of the 6top' management commands/primitives (e.g. Soft cell creatio= n)? In this case, we might need to reply to RPL, by SUCCESS or FAIL status?= Did I miss anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 2:05 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Pouria, It is the process to create a hard cell and slotframe. You see, "MLME-SET-= SLOTFRAME.confirm" and "MLME-SET-LINK.confirm" generates confirmation from = L2, which usually is one of factors to generate the confirmation message to= higher layer. In another word, when the status returned by "MLME-SET-SLOT= FRAME.confirm" or "MLME-SET-LINK.confirm" is False, the status reported fro= m 6top to higher layer must be False. But, there may be some other factors = also making the status False. Make sense? Qin On Fri, Aug 16, 2013 at 7:44 AM, > wrote: Hi Qin, Regarding to (2), this is my understanding from the procedure for creating = a hard cell and slotframe. Am I missing something from 6top? [cid:image001.jpg@01CE9AA8.EC2F0210] Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 12:32 AM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Raghuram and Pouria, The following is my understanding. (1) Taking the assumption in Raghuram's example, i.e. installing a route wi= th hard cells, then, some role like PCE should exist and take responsibilit= y to make conflict-free. In another word, the scenario described in the Rag= huram's example should not happen. (But, it doesn't mean a confirmation mes= sage is not needed, see the following) . (2) "MLME-SET-SLOTFRAME.confirm" and "MLME-SET-LINK.confirm" are primitive= s of 802.15.4e. The confirmation to upper layer should come from the execut= ion of 6top commands, which may related with the two 15.4e primitives, but = not exactly same. (3) RPL is a routing protocol. It uses the TSCH schedule to forward packets= , no matter the schedule is installed by PCE (hard cell) , or by some reser= vation protocol like RSVP (soft cell). Make sense? Thanks Qin On Fri, Aug 16, 2013 at 5:52 AM, > wrote: Hi Raghuram, Qin, Let me enter to your discussion I agree with Raghuram that when the higher layer call the 6top's commands (= or .requests primitives) it should be informed about the status of its requ= est by "command reply" or ".confirm" primitives. The status of the ".confir= m" or "reply" can be success, failure or ... Am I right? I couldn't either find the 6top's behavior upon receiving the "MLME-SET-SLO= TFRAME.confirm" or "MLME-SET-LINK.confirm" primitives that might be called = by L2. Did I miss that? Raghuram, I just have one minor comment, in your example. I think that the = RPL (L3) should use the "Create soft cell command" to ask a new cell withou= t specifying the exact cell. Because the L3 does not have enough informatio= n to ask for reserving specific cell in L2. The "Create hard cell command" = should be called by the one who has the global knowledge on network schedul= es, like PCE. However, I agree that the PCE by calling the "Create hard cel= l command" or RPL by calling "Create soft cell command" should be informed = by 6top about the status of its request. For example, It might happen that = PCE send a same request twice or RPL's request can't be serviced. AM I right? Pouria. From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Raghuram Sudhaa= kar (rsudhaak) Sent: Thursday, August 15, 2013 9:07 PM To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71488EXMBX23adutwent_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Hi Raghuram,

    Just one minor comment on= the diagram. I intend to show a simple flow diagram from L2 -> 6top -&g= t; higher layer. That’s why I choose the simplest commands from 6top (e.g. “CREATE hardcell” and “Create Slotframe”= ;) to show the “.confirm” flow from L2 -> 6top -> higher = layer. I didn’t show the other potential detailed flows for these two= commands.

    If we intend to show the = complete flow diagram of “Create Link Commands” (i.e. “CR= EATE hardcell” and “CREATE softcell”), there will be more= details. Especially, for “Create softcell” command that also need the negotiation w= ith the other neighbor. But, It would be helpful if we can draw these diagr= ams with ASCII text.

    Pouria<= /p>

     <= /p>

    From: Raghuram= Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com]
    Sent: Friday, August 16, 2013 4:53 PM
    To: Zand, P. (EWI); qinwang@berkeley.edu
    Cc: 6tsch@ietf.org
    Subject: Re: Message flows

     

    Qin, Pouria,

    The message flow diagram id= escribes the scenario perfectly. I think it should go in the document or at= least in an appendix to the document. I would make one change though, instead of have two command from L3 to 6top (create hard ce= ll, create soft cell) we can have only one command (install route) and depe= nding on the type of L3 6top decides whether to create  a hard or soft= cell. This will help 6top ensure that there are minimal conflicts (as pointed out already in this discussion) an= d in future we may be able to work with PCE and RPL simultaneously. This sc= enario of working with multiple L3's may occur when there are multiple over= lay/logical networks are being created over the same physical network.

     

    The on= ly caveat to this though is that we need to define a command from L3 to 6to= p that will help 6top identify the L3 protocol. Or we could also include a L3 protocol type field in every message from L3 -> 6top.=

     

    Qin me= ntioned that the status returned by L2 for the the slot installation proces= s can be forwarded to L3 by 6top but in some cases we may there may be other factors also. I thought about this but I can't identify= what other factors might affect the reply the 6top will send to L3. Can yo= u please identify what factors you had in mind. I think it is important we = nail down this flow very clearly and take care of all edge cases.

     

    -raghu= ram

     

    From: "P.Zand@utwente.nl" <P.= Zand@utwente.nl>
    Date: Friday, August 16, 2013 6:24 AM
    To: "qinwang@berkeley.e= du" <qinwang@berkeley.e= du>
    Cc: raghuram sudhaakar <rsu= dhaak@cisco.com>, "6tsch@ietf= .org" <6tsch@ietf.org>=
    Subject: RE: Message flows

     

    Qin,

     

    I completely agree with y= ou that the status of the report/confirm form 6top to higher layer might be= changed by other factors as well. My point is that, one of those factors, is the status of “.confirm” primitives recei= ved form L2. I think in 6top, we have to add them to the list of the factor= s that effect on the reply/confirm to higher layer. Am I right?  

     

    Regarding to (1), I think= , when the 6top commands/primitives are called by higher layer (either by P= CE, potential signaling protocol, or temporary by RPL in the lack of signaling protocol) we have to send a “.confirm” t= o inform them about the status of their requests. Am I right? I would say t= hat in some cases we might need to send the confirmation to PCE with the FA= IL status.

     

    Regarding to (3), I agree= that the signaling protocol and PCE should call the cell creation commands= /primitives. Do you agree that 6top should be independent form the higher layer that has called its primitives/command? Is there any= limitation that in the lack of signaling protocol, the RPL can’t cal= l some of the 6top’ management commands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

     

    Pouria

     

    From: Qin Wang [mailto:qi= nwang@berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     =

    Hi Pouria,

     =

    It is the process to cre= ate a hard cell and slotframe. You see,  “MLME-SET-SLOTFRAME.confirm” and “MLME-SET-LINK= .confirm” generates confirmation from L2, which usually is one of factors to generate the conf= irmation message to higher layer. In another word, when the status returned= by  “MLME-SET-SLOTFRAME.confirm” or “MLME-SET-= LINK.confirm” is False, the status reported from 6top to higher layer must be False. But, there may be some other factors also making the = status False.

     =

    Make sense?

     =

    Qin

     

    On Fri, Aug 16, 2013 at = 7:44 AM, <P.Zand@= utwente.nl> wrote:

    Hi Qin,

    Regarding to (2), this is my understand= ing from the procedure for creating a hard cell and slotframe. Am I missing something from 6top?<= /o:p>

     

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qin= wang@berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Raghuram and Pouria,

     

    The following is my understanding.

     

    (1) Taking the assumption in Raghuram'= s example, i.e. installing a route with hard cells, then, some role like PC= E should exist and take responsibility to make conflict-free. In another word, the scenario described in the Ragh= uram's example should not happen. (But, it doesn't mean a confirmation mess= age is not needed, see the following) .

     

    (2)  “MLME-SET-SLOTFRAME.confirm” and “MLME-SET-LIN= K.confirm” are primitives of 802.15.4e. The confirmation to upper layer should come from = the execution of 6top commands, which may related with the two 15.4e primit= ives, but not exactly same.

     

    (3) RPL is a routing protocol. It uses= the TSCH schedule to forward packets, no matter the schedule is installed = by PCE (hard cell) , or by some reservation protocol like RSVP (soft cell).

     

    Make sense?

     

    Thanks

    Qin

     

     

     

    On Fri, Aug 16, 2013 at 5:52 AM, <<= a href=3D"mailto:P.Zand@utwente.nl" target=3D"_blank">P.Zand@utwente.nl= > wrote:

    Hi Raghuram, Qin,

    Let me enter to your discussion<= span style=3D"color:black">

    I agree with Raghuram that when the hig= her layer call the 6top’s commands (or .requests primitives) it should be informed about the status of its request by “command re= ply” or “.confirm” primitives. The status of the “.= confirm” or “reply” can be success, failure or …

    Am I right?

    I couldn’t either find the 6top&#= 8217;s behavior upon receiving the “MLME-SET-SLOTFRAME.confirm”= or “MLME-SET-LINK.confirm” primitives that might be called by L2. Did I miss that?

     

    Raghuram, I just have one minor comment= , in your example. I think that the RPL (L3) should use the “Create soft cell command” to ask a new cell without specifyin= g the exact cell. Because the L3 does not have enough information to ask fo= r reserving specific cell in L2. The “Create hard cell command”= should be called by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he “Create hard cell command” or RPL by calling “Create s= oft cell command” should be informed by 6top about the status of its = request. For example, It might happen that PCE send a same request twice or RPL’s request can’t be serviced.

    AM I right?

     

    Pouria.     

     

    From:6tsch-bounces@= ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

     

    HI Qin,

    The conflicts I am referring to are -

     =

    Consdiering multihop communication and ha= rd-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68=
    2. But another route 2 requires node A to listen on slot 35. = ;

    There may be other such conflicts that we= may need to resolve.<= /p>

     =

    -raghuram

     =

     =

    Hi Raghuram,

     =

    I totally agree to your approach to defin= e the flow information to L3.=

     =

    Regarding to your question, can you expla= in more about:

    (1) from nodeA to nodeB is one hop or mul= ti-hop?

    (2) installing the route with hard cells = or soft cells?

    (3) what "conflict during route inst= allation" mean? what kind of conflict?

     =

    Thanks=

    Qin

     =

     =

     <= /o:p>

    On Thu, Aug 15, 2013 at 10:16 PM, Raghura= m Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of thoug= ht. I agree with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtai= n information from 6top. Obviously, 6top will expose these interfaces in it= s standard implementation.

     =

    Do you think finding the common requireme= nts from 6top to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for e= ach but they can be added as PCE or RPL specific primitives. I am not sugge= sting that we implement specific primitives for every L3 protocol, but once= we cover RPL and PCE I think we will satisfy the requirements of most L3s.

     =

    The different flows you have identified i= s perfect. 

    (1) The flows from 6top -> L2 have bee= n addressed quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_P<= /i>ARENT for e..g.

    (2) I would consider the requirements of = PCE, RPL, (probably v6ND) in terms of parameters required for route computation to define the general requirements for flows between= L3 and 6top. In the draft, you have already addressed some RPL specific pr= imitives like control message delivery. I think this should go in the RPL s= pecific part. We define primitives to expose parameters required by L3 to perform route computation in the ge= neral flows. For e.g. L2 neighbor list, link quality to each neighbor. We n= eed to specify the message format that needs to used by L3 to obtain this i= nfo.

    (3) We will also need 6top->L3 flows t= o be defined. For e.g., in the RPL case,  GET_RPL_PARENT will be one such flow as 6top needs to provide the primitive GET_TIMING= _PARENT in the L2->6top flow. A similar primitive needs to be there = for PCE.

     =

    (Note: when I say L2 -> 6top flow, I m= ean L2 is the data requestor entity and 6top is the data provider. This is my own convention and hence the clarification)

     =

    Another critical part I want to get your = opinions on is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when = it has data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

     =

     =

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

     =

    Hi Raghuram,

     =

    Sorry for the late response. It is welcom= e for you to add flow information if necessary.

     =

    Just one thing I want to understand more = clearly. I think 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just = one kind of upper layers in the future. Correct? 

     =

    In this sense, we should separate the gen= eral flow information to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to = 6top in this way?

     =

    (1) flow information with L2, i.e. TSCH

    (2) general flow information with upper l= ayer, may be L3 or L2.5

    (3) flow information with specific upper = layer protocol like RPL.

     =

    What do you think?

     =

    Qin 

     =

     =

     =

     =

     =

     =

     =

     =

     =

     =

     =

     <= /o:p>

    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram= Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Ok. 

     =

    Qin, if you are OK I can add the flow inf= ormation specific to RPL. 

     =

    -raghuram

     =

    From: Xavier Vilajosana Guillen <xvilajosana@eec= s.berkeley.edu>
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

     =

    Hi Raghuram,=

    I let Qin answer as she is the main autho= r. My opinion is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information = to add it is more than welcome!

    X

     <= /o:p>

    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram= Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some information = that needs to be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already th= ere in Qin's draft. I wanted to check with you guys if you want to add to t= he same document or split it into a separate RFC. When I say split into sep= arate RFC,  what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of infor= mation about L2 to 6top. I could add more about the RPL to 6top is its OK..=

     

    -raghuram

     =

     =

     =

     

     =

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rsudhaak@cisco.com Fri Aug 16 08:53:36 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1AD7511E828E for <6tsch@ietfa.amsl.com>; Fri, 16 Aug 2013 08:53:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QqOJR77rs5z5 for <6tsch@ietfa.amsl.com>; Fri, 16 Aug 2013 08:53:30 -0700 (PDT) Received: from rcdn-iport-8.cisco.com (rcdn-iport-8.cisco.com [173.37.86.79]) by ietfa.amsl.com (Postfix) with ESMTP id E352311E8169 for <6tsch@ietf.org>; Fri, 16 Aug 2013 08:53:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=103520; q=dns/txt; s=iport; t=1376668408; x=1377878008; h=from:to:cc:subject:date:message-id:in-reply-to: mime-version; bh=7/QBW4sFP5HBuK1xsKijPCPIR2pV1G29d/PPqDdQnNc=; b=YN/AofpPBCCznMOXQuhU47f+1ia5ym2J7DwlflmXbj51EGmMX3tXb/aQ S+s4vhaEVuWFx+4cmXQhHK8x2FYxnCZ33fxYMA27bTCX/iqB/2chRyG4A CLrgQDJVHNW0HRlq7GMwxAVJylmcliCxFrg4Q1Nm7g/N3V4zfwLCIaFcE 8=; X-Files: image001.jpg : 18869 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AlwFAG5KDlKtJXG9/2dsb2JhbABRCg6CNEQ1Ub8bgSsWdIIkAQEBBAUVCwIGAUsSAQgRAwEBAQYBAQECCA4BBgkVAQwCDBQJCAIEAQ0EAQYCBogCuhOPAgeBFgYHCQoRBgECAgKDFXcDkBaBLgFZgS6ICY1kgl0/gWgkHg X-IronPort-AV: E=Sophos;i="4.89,895,1367971200"; d="jpg'145?scan'145,208,217,145";a="248176135" Received: from rcdn-core2-2.cisco.com ([173.37.113.189]) by rcdn-iport-8.cisco.com with ESMTP; 16 Aug 2013 15:53:26 +0000 Received: from xhc-aln-x09.cisco.com (xhc-aln-x09.cisco.com [173.36.12.83]) by rcdn-core2-2.cisco.com (8.14.5/8.14.5) with ESMTP id r7GFrQoG031767 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 16 Aug 2013 15:53:26 GMT Received: from xmb-rcd-x04.cisco.com ([169.254.8.180]) by xhc-aln-x09.cisco.com ([173.36.12.83]) with mapi id 14.02.0318.004; Fri, 16 Aug 2013 10:53:26 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: "P.Zand@utwente.nl" , "qinwang@berkeley.edu" Thread-Topic: Message flows Thread-Index: AQHOmpi92+M8VWnoB0iALAow4p1lsA== Date: Fri, 16 Aug 2013 15:53:25 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852ECAE@xmb-rcd-x04.cisco.com> In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA71488@EXMBX23.ad.utwente.nl> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.21.115.180] Content-Type: multipart/mixed; boundary="_004_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852ECAExmbrcdx04ciscoc_" MIME-Version: 1.0 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Aug 2013 15:53:38 -0000 --_004_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852ECAExmbrcdx04ciscoc_ Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852ECAExmbrcdx04ciscoc_" --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852ECAExmbrcdx04ciscoc_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Pouria, Agreed. From: "P.Zand@utwente.nl" > Date: Friday, August 16, 2013 8:50 AM To: raghuram sudhaakar >, "qi= nwang@berkeley.edu" > Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: RE: Message flows Hi Raghuram, Just one minor comment on the diagram. I intend to show a simple flow diagr= am from L2 -> 6top -> higher layer. That=92s why I choose the simplest comm= ands from 6top (e.g. =93CREATE hardcell=94 and =93Create Slotframe=94) to s= how the =93.confirm=94 flow from L2 -> 6top -> higher layer. I didn=92t sho= w the other potential detailed flows for these two commands. If we intend to show the complete flow diagram of =93Create Link Commands= =94 (i.e. =93CREATE hardcell=94 and =93CREATE softcell=94), there will be m= ore details. Especially, for =93Create softcell=94 command that also need t= he negotiation with the other neighbor. But, It would be helpful if we can = draw these diagrams with ASCII text. Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Friday, August 16, 2013 4:53 PM To: Zand, P. (EWI); qinwang@berkeley.edu Cc: 6tsch@ietf.org Subject: Re: Message flows Qin, Pouria, The message flow diagram idescribes the scenario perfectly. I think it shou= ld go in the document or at least in an appendix to the document. I would m= ake one change though, instead of have two command from L3 to 6top (create = hard cell, create soft cell) we can have only one command (install route) a= nd depending on the type of L3 6top decides whether to create a hard or so= ft cell. This will help 6top ensure that there are minimal conflicts (as po= inted out already in this discussion) and in future we may be able to work = with PCE and RPL simultaneously. This scenario of working with multiple L3'= s may occur when there are multiple overlay/logical networks are being crea= ted over the same physical network. The only caveat to this though is that we need to define a command from L3 = to 6top that will help 6top identify the L3 protocol. Or we could also incl= ude a L3 protocol type field in every message from L3 -> 6top. Qin mentioned that the status returned by L2 for the the slot installation = process can be forwarded to L3 by 6top but in some cases we may there may b= e other factors also. I thought about this but I can't identify what other = factors might affect the reply the 6top will send to L3. Can you please ide= ntify what factors you had in mind. I think it is important we nail down th= is flow very clearly and take care of all edge cases. -raghuram From: "P.Zand@utwente.nl" > Date: Friday, August 16, 2013 6:24 AM To: "qinwang@berkeley.edu" > Cc: raghuram sudhaakar >, "6t= sch@ietf.org" <6tsch@ietf.org= > Subject: RE: Message flows Qin, I completely agree with you that the status of the report/confirm form 6top= to higher layer might be changed by other factors as well. My point is tha= t, one of those factors, is the status of =93.confirm=94 primitives receive= d form L2. I think in 6top, we have to add them to the list of the factors = that effect on the reply/confirm to higher layer. Am I right? Regarding to (1), I think, when the 6top commands/primitives are called by = higher layer (either by PCE, potential signaling protocol, or temporary by = RPL in the lack of signaling protocol) we have to send a =93.confirm=94 to = inform them about the status of their requests. Am I right? I would say tha= t in some cases we might need to send the confirmation to PCE with the FAIL= status. Regarding to (3), I agree that the signaling protocol and PCE should call t= he cell creation commands/primitives. Do you agree that 6top should be inde= pendent form the higher layer that has called its primitives/command? Is th= ere any limitation that in the lack of signaling protocol, the RPL can=92t = call some of the 6top=92 management commands/primitives (e.g. Soft cell cre= ation)? In this case, we might need to reply to RPL, by SUCCESS or FAIL sta= tus? Did I miss anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 2:05 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Pouria, It is the process to create a hard cell and slotframe. You see, =93MLME-SE= T-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 generates confirmati= on from L2, which usually is one of factors to generate the confirmation me= ssage to higher layer. In another word, when the status returned by =93MLM= E-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 is False, the sta= tus reported from 6top to higher layer must be False. But, there may be som= e other factors also making the status False. Make sense? Qin On Fri, Aug 16, 2013 at 7:44 AM, > wrote: Hi Qin, Regarding to (2), this is my understanding from the procedure for creating = a hard cell and slotframe. Am I missing something from 6top? [cid:image001.jpg@01CE9AA8.EC2F0210] Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 12:32 AM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Raghuram and Pouria, The following is my understanding. (1) Taking the assumption in Raghuram's example, i.e. installing a route wi= th hard cells, then, some role like PCE should exist and take responsibilit= y to make conflict-free. In another word, the scenario described in the Rag= huram's example should not happen. (But, it doesn't mean a confirmation mes= sage is not needed, see the following) . (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are p= rimitives of 802.15.4e. The confirmation to upper layer should come from th= e execution of 6top commands, which may related with the two 15.4e primitiv= es, but not exactly same. (3) RPL is a routing protocol. It uses the TSCH schedule to forward packets= , no matter the schedule is installed by PCE (hard cell) , or by some reser= vation protocol like RSVP (soft cell). Make sense? Thanks Qin On Fri, Aug 16, 2013 at 5:52 AM, > wrote: Hi Raghuram, Qin, Let me enter to your discussion I agree with Raghuram that when the higher layer call the 6top=92s commands= (or .requests primitives) it should be informed about the status of its re= quest by =93command reply=94 or =93.confirm=94 primitives. The status of th= e =93.confirm=94 or =93reply=94 can be success, failure or =85 Am I right? I couldn=92t either find the 6top=92s behavior upon receiving the =93MLME-S= ET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitives that migh= t be called by L2. Did I miss that? Raghuram, I just have one minor comment, in your example. I think that the = RPL (L3) should use the =93Create soft cell command=94 to ask a new cell wi= thout specifying the exact cell. Because the L3 does not have enough inform= ation to ask for reserving specific cell in L2. The =93Create hard cell com= mand=94 should be called by the one who has the global knowledge on network= schedules, like PCE. However, I agree that the PCE by calling the =93Creat= e hard cell command=94 or RPL by calling =93Create soft cell command=94 sho= uld be informed by 6top about the status of its request. For example, It mi= ght happen that PCE send a same request twice or RPL=92s request can=92t be= serviced. AM I right? Pouria. From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Raghuram Sudhaa= kar (rsudhaak) Sent: Thursday, August 15, 2013 9:07 PM To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1852ECAExmbrcdx04ciscoc_ Content-Type: text/html; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: quoted-printable
    Pouria, Agreed.

    From: "P.Zand@utwente.nl" <P.Zand@utwente.nl>
    Date: Friday, August 16, 2013 8:50 = AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>, "qinwang@berkeley.edu" <qinwang@berkeley.edu>
    Cc: "6tsch@ietf.org" <6ts= ch@ietf.org>
    Subject: RE: Message flows

    Hi Raghuram,

    Just one minor comment on the diag= ram. I intend to show a simple flow diagram from L2 -> 6top -> higher= layer. That=92s why I choose the simplest commands from 6top (e.g. =93CREATE hardcell=94 and =93Create Slotframe=94) to show = the =93.confirm=94 flow from L2 -> 6top -> higher layer. I didn=92t s= how the other potential detailed flows for these two commands.

    If we intend to show the complete = flow diagram of =93Create Link Commands=94 (i.e. =93CREATE hardcell=94 and = =93CREATE softcell=94), there will be more details. Especially, for =93Create softcell=94 command that also need the negotiati= on with the other neighbor. But, It would be helpful if we can draw these d= iagrams with ASCII text.

    Pouria

     

    From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com]
    Sent: Friday, August 16, 2013 4:53 PM
    To: Zand, P. (EWI); qinwang@= berkeley.edu
    Cc: 6tsch@ietf.org
    Subject: Re: Message flows

     

    Qin, Pouria,

    The message flow diagram idescribes the sce= nario perfectly. I think it should go in the document or at least in an app= endix to the document. I would make one change though, instead of have two command from L3 to 6top (create har= d cell, create soft cell) we can have only one command (install route) and = depending on the type of L3 6top decides whether to create  a hard or = soft cell. This will help 6top ensure that there are minimal conflicts (as pointed out already in this discussio= n) and in future we may be able to work with PCE and RPL simultaneously. Th= is scenario of working with multiple L3's may occur when there are multiple= overlay/logical networks are being created over the same physical network.

     

    The only caveat to this = though is that we need to define a command from L3 to 6top that will help 6= top identify the L3 protocol. Or we could also include a L3 protocol type field in every message from L3 -> 6top.=

     

    Qin mentioned that the s= tatus returned by L2 for the the slot installation process can be forwarded= to L3 by 6top but in some cases we may there may be other factors also. I thought about this but I can't identify= what other factors might affect the reply the 6top will send to L3. Can yo= u please identify what factors you had in mind. I think it is important we = nail down this flow very clearly and take care of all edge cases.

    <= o:p> 

    -raghuram<= span style=3D"font-family: Calibri, sans-serif; ">

     

     

    Qin,

     

    I completely agree with you that t= he status of the report/confirm form 6top to higher layer might be changed = by other factors as well. My point is that, one of those factors, is the status of =93.confirm=94 primitives rec= eived form L2. I think in 6top, we have to add them to the list of the fact= ors that effect on the reply/confirm to higher layer. Am I right? &nbs= p;

     

    Regarding to (1), I think, when th= e 6top commands/primitives are called by higher layer (either by PCE, poten= tial signaling protocol, or temporary by RPL in the lack of signaling protocol) we have to send a =93.confirm=94= to inform them about the status of their requests. Am I right? I would say= that in some cases we might need to send the confirmation to PCE with the = FAIL status.

     

    Regarding to (3), I agree that the= signaling protocol and PCE should call the cell creation commands/primitiv= es. Do you agree that 6top should be independent form the higher layer that has called its primitives/command? = Is there any limitation that in the lack of signaling protocol, the RPL can= =92t call some of the 6top=92 management commands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

     

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     =

    Hi Pouria,

     =

    It is the process to cre= ate a hard cell and slotframe. You see, &nb= sp;=93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usually is one of factors to generat= e the confirmation message to higher layer. In another word, when the statu= s returned by  =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LI= NK.confirm=94 is False, the status reported from 6top to higher layer must be False. But, there may be some other factors also m= aking the status False.

     =

    Make sense?

     =

    Qin

     

    On Fri, Aug 16, 2013 at = 7:44 AM, <P.Zand@= utwente.nl> wrote:

    Hi Qin,<= /o:p>

    Regarding to (2), this is my understanding from = the procedure for creating a hard cell and slotframe. Am I missing something from 6top?

     

    Best Wishes,<= o:p>

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Raghuram and Pouria,

     

    The following is my understanding.

     

    (1) Taking the assumption in Raghuram'= s example, i.e. installing a route with hard cells, then, some role like PC= E should exist and take responsibility to make conflict-free. In another word, the scenario described in the Ragh= uram's example should not happen. (But, it doesn't mean a confirmation mess= age is not needed, see the following) .

     

    (2) &n= bsp;=93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4e. The confirmation to upper layer should come f= rom the execution of 6top commands, which may related with the two 15.4e pr= imitives, but not exactly same.

     

    (3) RPL is a routing protocol. It uses= the TSCH schedule to forward packets, no matter the schedule is installed = by PCE (hard cell) , or by some reservation protocol like RSVP (soft cell).

     

    Make sense?

     

    Thanks

    Qin

     

     

     

    On Fri, Aug 16, 2013 at 5:52 AM, <<= a href=3D"mailto:P.Zand@utwente.nl" target=3D"_blank">P.Zand@utwente.nl= > wrote:

    Hi Raghuram, Qin,

    Let me enter to your discussion

    I agree with Raghuram that when the higher layer= call the 6top=92s commands (or .requests primitives) it should be informed about the status of its request by =93co= mmand reply=94 or =93.confirm=94 primitives. The status of the =93.confirm= =94 or =93reply=94 can be success, failure or =85

    Am I right?

    I couldn=92t either find the 6top=92s behavior u= pon receiving the =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitives that might be called by L2. Did = I miss that?

     

    Raghuram, I just have one minor comment, in your= example. I think that the RPL (L3) should use the =93Create soft cell command=94 to ask a new cell without specifyin= g the exact cell. Because the L3 does not have enough information to ask fo= r reserving specific cell in L2. The =93Create hard cell command=94 should = be called by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by= calling the =93Create hard cell command=94 or RPL by calling =93Create sof= t cell command=94 should be informed by 6top about the status of its reques= t. For example, It might happen that PCE send a same request twice or RPL=92s request can=92t be serviced. <= span style=3D"color:black">

    AM I right?

     

    Pouria.     

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

     

    HI Qin,

    The conflicts I am referring to are -

     

    Consdiering multihop communication and hard-cells<= span style=3D"color:black">

    1. Route= 1 requires a particular set of slots to be setup. Say node A must listen o= n slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But a= nother route 2 requires node A to listen on slot 35. 

    There may be other such conflicts that we may need to res= olve.

     

    -raghuram

     

     =

    Hi Raghuram,

     

    I totally agree to your approach to define the flow infor= mation to L3.

     

    Regarding to your question, can you explain more about:

    (1) from nodeA to nodeB is one hop or multi-hop?

    (2) installing the route with hard cells or soft cells?

    (3) what "conflict during route installation" m= ean? what kind of conflict?

     

    Thanks

    Qin<= /p>

     

     

     

    On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsu= dhaak) <rsudhaak= @cisco.com> wrote:

    Qin,=

    I have pretty much the same line of thought. I agree with= the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to o= btain information from 6top. Obviously, 6top will expose these interfaces i= n its standard implementation.

     

    Do you think finding the common requirements from 6top to= L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements= for each but they can be added as PCE or RPL specific primitives. I am not= suggesting that we implement specific primitives for every L3 protocol, bu= t once we cover RPL and PCE I think we will satisfy the requirements of most L3s.

     

    The different flows you have identified is perfect. =

    (1) The flows from 6top -> L2 have been addressed quit= e extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMIN= G_PARENT for e..g.=

    (2) I would consider the requirements of PCE, RPL, (proba= bly v6ND) in terms of parameters required for route computation to define the general requirements for flows between= L3 and 6top. In the draft, you have already addressed some RPL specific pr= imitives like control message delivery. I think this should go in the RPL s= pecific part. We define primitives to expose parameters required by L3 to perform route computation in the ge= neral flows. For e.g. L2 neighbor list, link quality to each neighbor. We n= eed to specify the message format that needs to used by L3 to obtain this i= nfo.

    (3) We will also need 6top->L3 flows to be defined. Fo= r e.g., in the RPL case,  GET_RPL_PARENT will be one such flow as 6top needs to provide the primitive GET_TIMING= _PARENT in the L2->6top flow. A similar primitive needs to be there = for PCE.

     

    (Note: when I say L2 -> 6top flow, I mean L2 is the da= ta requestor entity and 6top is the data provider. This is my own convention and hence the clarification)

     

    Another critical part I want to get your opinions on is t= he following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when = it has data to send to node B. In this case -

    1. How d= o resolve conflict during route installation? L3 computes a route and send = it over to 6top. Which in turn converts it to slot reservations using the 6= top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then = we have to ask, does 6top provide a mechanism to inform L3 about failure an= d obtain a recomputed route (i.e.) perform n number of retries. Or just fai= l after one try and leave it to the node to reinitiate a route request.

    -raghuram

     

     

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

     

    Hi Raghuram,

     

    Sorry for the late response. It is welcome for you to add= flow information if necessary.

     

    Just one thing I want to understand more clearly. I think= 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just = one kind of upper layers in the future. Correct? 

     

    In this sense, we should separate the general flow inform= ation to upper layer and the specific flow information to RPL. Then, can we organize the flow information relate= d to 6top in this way?=

     

    (1) flow information with L2, i.e. TSCH

    (2) general flow information with upper layer, may be L3 = or L2.5

    (3) flow information with specific upper layer protocol l= ike RPL.

     

    What do you think?

     

    Qin 

     

     

     

     

     

     

     

     

     

     

     

     

    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsud= haak) <rsudhaak@= cisco.com> wrote:

    Ok. 

     

    Qin, if you are OK I can add the flow information specifi= c to RPL. 

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu&g= t;
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

     

    Hi Raghuram,

    I let Qin answer as she is the main author. My opinion is= that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have infor= mation to add it is more than welcome!

    X

     

    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsud= haak) <rsudhaak@= cisco.com> wrote:

    Xavi, Qin,<= /span>

    I believe that there is some information that needs to be= added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is alre= ady there in Qin's draft. I wanted to check with you guys if you want to ad= d to the same document or split it into a separate RFC. When I say split in= to separate RFC,  what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of = information about L2 to 6top. I could add more about the RPL to 6top is its= OK..

     

    -raghuram=

     

     

     

     

     =

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qinwang@berkeley.edu Sat Aug 17 06:17:49 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2B63721F9C6B for <6tsch@ietfa.amsl.com>; Sat, 17 Aug 2013 06:17:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.926 X-Spam-Level: X-Spam-Status: No, score=-2.926 tagged_above=-999 required=5 tests=[AWL=0.050, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UMAEBGTd-hFA for <6tsch@ietfa.amsl.com>; Sat, 17 Aug 2013 06:17:43 -0700 (PDT) Received: from mail-vc0-f172.google.com (mail-vc0-f172.google.com [209.85.220.172]) by ietfa.amsl.com (Postfix) with ESMTP id 5055B21F8DE3 for <6tsch@ietf.org>; Sat, 17 Aug 2013 06:17:43 -0700 (PDT) Received: by mail-vc0-f172.google.com with SMTP id m17so2151352vca.3 for <6tsch@ietf.org>; Sat, 17 Aug 2013 06:17:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=eFVz3zXQkVmlvP1R0LAf09JhbCg3sxR2etdkcUDoa9E=; b=G/r8P8632H6brfpHZXT2dHT9NwU1b5++RxvKO/dL3JlBGZxOUKFykuvlTNQ166uM8a 0E6qlhTkN6Wo0Rs3qMegsXqrw3a1RH1LGws2Z4assYFpo6dwLvaFO1WQ/QsyVGLdiG0B okZIpgG+JotTGsj+Lnd4hAGK6whKVq1sWJvp/r07RhDuEhWGddLwWCBaF5Mwv37ifolB IZPGF4aI5OiBpvCZ6+V9Z1rMYozj9C5aH31eGHFOHJsrIvWogo44vO30Ns4ajeD6X37s sTARaszg/Z+mImnASMeP5i1wLXPkCPPlc1eooOM5FQ/e2QVnfh0uSDYsdEkP9/19kHEx BqaA== X-Gm-Message-State: ALoCoQlKRshBH55o7jIW+Vdg3setMjnnD8Y8A1T0n2D15lECsDiIdnY1zfYsuXLP7UMwM+bw4N1H MIME-Version: 1.0 X-Received: by 10.52.227.6 with SMTP id rw6mr2623388vdc.19.1376745460271; Sat, 17 Aug 2013 06:17:40 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Sat, 17 Aug 2013 06:17:39 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> Date: Sat, 17 Aug 2013 21:17:39 +0800 Message-ID: From: Qin Wang To: "P.Zand@utwente.nl" Content-Type: multipart/related; boundary=089e011616601b4d7104e4248886 Cc: "Raghuram Sudhaakar \(rsudhaak\)" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Aug 2013 13:17:49 -0000 --089e011616601b4d7104e4248886 Content-Type: multipart/alternative; boundary=089e011616601b4d6f04e4248885 --089e011616601b4d6f04e4248885 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Pouira, I see your point. In the task item-1 "Timeslot Management methods and formats", control flows will be defined (See the record for teleconference on 8/9). We can address the issue you mentioned above in that document. Maybe we should start a thread to discuss what the control flows should be, what the message contents should be. Regarding to the interface between 6top and RPL, my understanding is RPL just use the TSCH schedule, instead of building the schedule by using something like Soft cell creation. But, maybe, the status of TSCH schedule can be taken as a factor of RPL's OF. What do you think? Qin On Fri, Aug 16, 2013 at 9:24 PM, wrote: > Qin,**** > > ** ** > > I completely agree with you that the status of the report/confirm form > 6top to higher layer might be changed by other factors as well. My point = is > that, one of those factors, is the status of =93.confirm=94 primitives re= ceived > form L2. I think in 6top, we have to add them to the list of the factors > that effect on the reply/confirm to higher layer. Am I right? **** > > ** ** > > Regarding to (1), I think, when the 6top commands/primitives are called b= y > higher layer (either by PCE, potential signaling protocol, or temporary b= y > RPL in the lack of signaling protocol) we have to send a =93.confirm=94 t= o > inform them about the status of their requests. Am I right? I would say > that in some cases we might need to send the confirmation to PCE with the > FAIL status.**** > > ** ** > > Regarding to (3), I agree that the signaling protocol and PCE should call > the cell creation commands/primitives. Do you agree that 6top should be > independent form the higher layer that has called its primitives/command? > Is there any limitation that in the lack of signaling protocol, the RPL > can=92t call some of the 6top=92 management commands/primitives (e.g. *So= ft > cell creation*)? In this case, we might need to reply to RPL, by SUCCESS > or FAIL status? Did I miss anything?**** > > ** ** > > Pouria**** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Friday, August 16, 2013 2:05 PM > > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > ** ** > > Hi Pouria,**** > > ** ** > > It is the process to create a hard cell and slotframe. You see, =93MLME-= SET-SLOTFRAME.confirm=94 > and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usu= ally > is one of factors to generate the confirmation message to higher layer. I= n > another word, when the status returned by =93MLME-SET-SLOTFRAME.confirm= =94 or > =93MLME-SET-LINK.confirm=94 is False, the status reported from 6top to hi= gher > layer must be False. But, there may be some other factors also making the > status False.**** > > ** ** > > Make sense?**** > > ** ** > > Qin**** > > ** ** > > On Fri, Aug 16, 2013 at 7:44 AM, wrote:**** > > Hi Qin,**** > > Regarding to (2), this is my understanding from the procedure for creatin= g > a hard cell and slotframe. Am I missing something from 6top?**** > > **** > > **** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Friday, August 16, 2013 12:32 AM > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > **** > > Hi Raghuram and Pouria,**** > > **** > > The following is my understanding.**** > > **** > > (1) Taking the assumption in Raghuram's example, i.e. installing a route > with hard cells, then, some role like PCE should exist and take > responsibility to make conflict-free. In another word, the scenario > described in the Raghuram's example should not happen. (But, it doesn't > mean a confirmation message is not needed, see the following) .**** > > **** > > (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are > primitives of 802.15.4e. The confirmation to upper layer should come from > the execution of 6top commands, which may related with the two 15.4e > primitives, but not exactly same.**** > > **** > > (3) RPL is a routing protocol. It uses the TSCH schedule to forward > packets, no matter the schedule is installed by PCE (hard cell) , or by > some reservation protocol like RSVP (soft cell).**** > > **** > > Make sense?**** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > **** > > On Fri, Aug 16, 2013 at 5:52 AM, wrote:**** > > Hi Raghuram, Qin,**** > > Let me enter to your discussion**** > > I agree with Raghuram that when the higher layer call the 6top=92s comman= ds > (or .requests primitives) it should be informed about the status of its > request by =93command reply=94 or =93.confirm=94 primitives. The status o= f the > =93.confirm=94 or =93reply=94 can be success, failure or =85**** > > Am I right?**** > > I couldn=92t either find the 6top=92s behavior upon receiving the > =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitive= s that > might be called by L2. Did I miss that?**** > > **** > > Raghuram, I just have one minor comment, in your example. I think that th= e > RPL (L3) should use the =93Create soft cell command=94 to ask a new cell > without specifying the exact cell. Because the L3 does not have enough > information to ask for reserving specific cell in L2. The =93Create hard = cell > command=94 should be called by the one who has the global knowledge on > network schedules, like PCE. However, I agree that the PCE by calling the > =93Create hard cell command=94 or RPL by calling =93Create soft cell comm= and=94 > should be informed by 6top about the status of its request. For example, = It > might happen that PCE send a same request twice or RPL=92s request can=92= t be > serviced. **** > > AM I right?**** > > **** > > Pouria. **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Raghuram Sudhaakar (rsudhaak) > *Sent:* Thursday, August 15, 2013 9:07 PM > *To:* Qin Wang > *Cc:* 6tsch@ietf.org > *Subject:* Re: [6tsch] Message flows**** > > **** > > HI Qin,**** > > The conflicts I am referring to are -**** > > **** > > Consdiering multihop communication and hard-cells**** > > 1. Route 1 requires a particular set of slots to be setup. Say node A > must listen on slot number 11, 34, 65 and Tx on 13, 35, 68**** > 2. But another route 2 requires node A to listen on slot 35. **** > > There may be other such conflicts that we may need to resolve.**** > > **** > > -raghuram**** > > **** > > **** > > Hi Raghuram, **** > > **** > > I totally agree to your approach to define the flow information to L3.***= * > > **** > > Regarding to your question, can you explain more about:**** > > (1) from nodeA to nodeB is one hop or multi-hop?**** > > (2) installing the route with hard cells or soft cells?**** > > (3) what "conflict during route installation" mean? what kind of conflict= ? > **** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Qin,**** > > I have pretty much the same line of thought. I agree with the point that > 6top is independent from L3. What we are trying to do is define what L3 > will need to implement to obtain information from 6top. Obviously, 6top > will expose these interfaces in its standard implementation.**** > > **** > > Do you think finding the common requirements from 6top to L3 flows betwee= n > RPL and PCE is a good place to start? I am sure there are going to be som= e > specific requirements for each but they can be added as PCE or RPL specif= ic > primitives. I am not suggesting that we implement specific primitives for > every L3 protocol, but once we cover RPL and PCE I think we will satisfy > the requirements of most L3s.**** > > **** > > The different flows you have identified is perfect. **** > > (1) The flows from 6top -> L2 have been addressed quite extensively in th= e > draft already. There are a few flows from L2 -> 6top that have to be > addressed. GET_*TIMING_P*ARENT for e..g.**** > > (2) I would consider the requirements of PCE, RPL, (probably v6ND) in > terms of parameters required for route computation to define the general > requirements for flows between L3 and 6top. In the draft, you have alread= y > addressed some RPL specific primitives like control message delivery. I > think this should go in the RPL specific part. We define primitives to > expose parameters required by L3 to perform route computation in the > general flows. For e.g. L2 neighbor list, link quality to each neighbor. = We > need to specify the message format that needs to used by L3 to obtain thi= s > info.**** > > (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL > case, GET_*RPL_*PARENT will be one such flow as 6top needs to provide > the primitive GET_*TIMING_*PARENT in the L2->6top flow. A similar > primitive needs to be there for PCE.**** > > **** > > (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity > and 6top is the data provider. This is my own convention and hence the > clarification)**** > > **** > > Another critical part I want to get your opinions on is the following. We > have decided that irrespective of L3 (PCE or RPL) a node A will initiate > route installation request when it has data to send to node B. In this ca= se > -**** > > 1. How do resolve conflict during route installation? L3 computes a > route and send it over to 6top. Which in turn converts it to slot > reservations using the 6top -> L2 primitives in the slot frame. What i= f > there is a conflict during this slot reservation? What are the message= s > that will inform L3 and the node that route installation failed? This = must > also cause L3 to recompute its route.**** > 2. Then we have to ask, does 6top provide a mechanism to inform L3 > about failure and obtain a recomputed route (i.e.) perform n number of > retries. Or just fail after one try and leave it to the node to reinit= iate > a route request. **** > > -raghuram**** > > **** > > **** > > *From: *Qin Wang > *Date: *Thursday, August 15, 2013 6:00 AM > *To: *raghuram sudhaakar > *Cc: *"xvilajosana@eecs.berkeley.edu" > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram, **** > > **** > > Sorry for the late response. It is welcome for you to add flow informatio= n > if necessary.**** > > **** > > Just one thing I want to understand more clearly. I think 6top is a > relatively independent sublayer from upper layer. RPL is used as upper > layer in the first step, but, just one kind of upper layers in the future= . > Correct? **** > > **** > > In this sense, we should separate the general flow information to upper > layer and the specific flow information to RPL. Then, can we organize the > flow information related to 6top in this way?**** > > **** > > (1) flow information with L2, i.e. TSCH**** > > (2) general flow information with upper layer, may be L3 or L2.5**** > > (3) flow information with specific upper layer protocol like RPL.**** > > **** > > What do you think?**** > > **** > > Qin **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Ok. **** > > **** > > Qin, if you are OK I can add the flow information specific to RPL. **** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: *"xvilajosana@eecs.berkeley.edu" > > *Date: *Wednesday, August 14, 2013 2:32 PM > *To: *raghuram sudhaakar > *Cc: *Qin Wang > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram,**** > > I let Qin answer as she is the main author. My opinion is that by now we > keep the document as a single file but we separate the two message flows. > IMHO, if you have information to add it is more than welcome! > > X**** > > **** > > On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Xavi, Qin,**** > > I believe that there is some information that needs to be added to the > message flows that will occur between L3 -> 6top and L2 -> 6top, in > addition to what is already there in Qin's draft. I wanted to check with > you guys if you want to add to the same document or split it into a > separate RFC. When I say split into separate RFC, what I mean is, L3 to > 6top is one RFC and L2 to 6top is another. The current draft has a lot of > information about L2 to 6top. I could add more about the RPL to 6top is i= ts > OK..**** > > **** > > -raghuram**** > > **** > > **** > > **** > > **** > > ** ** > --089e011616601b4d6f04e4248885 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Pouira,

    I see your point. In the task i= tem-1 "Timeslot Management methods and formats", control flows wi= ll be defined (See the record for teleconference on 8/9). We can address th= e issue you mentioned above in that document. Maybe we should start a threa= d to discuss what the control flows should be, what the message contents sh= ould be.

    Regarding to the interface between 6top and RPL, my und= erstanding is RPL just use the TSCH schedule, instead of building the sched= ule by using something like Soft cell creation. But, maybe, the status of T= SCH schedule can be taken as a factor of RPL's OF. What do you think?

    Qin



    <= /div>


    On Fri, = Aug 16, 2013 at 9:24 PM, <P.Zand@utwente.nl> wrote:

    Qin,=

    =A0<= /p>

    I completely agree with y= ou that the status of the report/confirm form 6top to higher layer might be= changed by other factors as well. My point is that, one of those factors, is the status of =93.confirm=94 primitives received form= L2. I think in 6top, we have to add them to the list of the factors that e= ffect on the reply/confirm to higher layer. Am I right?=A0=A0

    =A0<= /p>

    Regarding to (1), I think= , when the 6top commands/primitives are called by higher layer (either by P= CE, potential signaling protocol, or temporary by RPL in the lack of signaling protocol) we have to send a =93.confirm=94 to inform= them about the status of their requests. Am I right? I would say that in s= ome cases we might need to send the confirmation to PCE with the FAIL statu= s.

    =A0<= /p>

    Regarding to (3), I agree= that the signaling protocol and PCE should call the cell creation commands= /primitives. Do you agree that 6top should be independent form the higher layer that has called its primitives/command? Is there any= limitation that in the lack of signaling protocol, the RPL can=92t call so= me of the 6top=92 management commands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

    =A0<= /p>

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Pouria,

    =A0

    It is the process to create a hard cell and slotfram= e. You see,=A0=A0=93MLME-SET-SLOTFRAME.confirm= =94 and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usually is one of factors to generate the confirmation message to higher l= ayer. In another word, when the status returned by=A0=A0=93MLME-SET-SLOTFRA= ME.confirm=94 or =93MLME-SET-LINK.confirm=94 is False, the status reported = from 6top to higher layer must be False. But, there may be some other factors also making the status False.

    =A0

    Make sense?=

    =A0

    Qin<= /p>

    =A0

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:=

    Hi Qin,<= /u>

    Regarding to (2), this is= my understanding from the procedure for creating a hard cell and slotframe= . Am I missing something from 6top?

    =A0<= /p>

    <= u>

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Raghuram and Pouria,

    =A0

    The following is my understanding.

    =A0

    (1) Taking the assumption in Raghuram's example,= i.e. installing a route with hard cells, then, some role like PCE should e= xist and take responsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should = not happen. (But, it doesn't mean a confirmation message is not needed,= see the following) .

    =A0

    (2)=A0=A0=93MLME-SET-SLOT= FRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4= e. The confirmation to upper layer should come from the execution of 6top commands, which may = related with the two 15.4e primitives, but not exactly same.<= u>

    =A0

    (3) RPL is a routing protocol. It uses the TSCH sche= dule to forward packets, no matter the schedule is installed by PCE (hard c= ell) , or by some reservation protocol like RSVP (soft cell).

    =A0

    Make sense?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:=

    Hi Raghuram, Qin,<= u>

    Let me enter to your disc= ussion

    I agree with Raghuram tha= t when the higher layer call the 6top=92s commands (or .requests primitives= ) it should be informed about the status of its request by =93command reply= =94 or =93.confirm=94 primitives. The status of the =93.confirm=94 or =93re= ply=94 can be success, failure or =85

    Am I right?=

    I couldn=92t either find = the 6top=92s behavior upon receiving the =93MLME-SET-SLOTFRAME.confirm=94 o= r =93MLME-SET-LINK.confirm=94 primitives that might be called by L2. Did I miss that?

    =A0<= /p>

    Raghuram, I just have one= minor comment, in your example. I think that the RPL (L3) should use the =93Create soft cell command=94 to ask a new cell without specifying the ex= act cell. Because the L3 does not have enough information to ask for reserv= ing specific cell in L2. The =93Create hard cell command=94 should be calle= d by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he =93Create hard cell command=94 or RPL by calling =93Create soft cell com= mand=94 should be informed by 6top about the status of its request. For exa= mple, It might happen that PCE send a same request twice or RPL=92s request can=92t be serviced.

    AM I right?=

    =A0<= /p>

    Pouria.=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

    =A0

    HI Qin,

    The conflicts I am referring to are -

    =A0

    Consdiering multihop communication and = hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But another route 2 requires node A to listen on slot 35.=A0

    There may be other such conflicts that = we may need to resolve.

    =A0

    -raghuram

    =A0

    =A0

    Hi Raghuram,

    =A0

    I totally agree to your approach to def= ine the flow information to L3.

    =A0

    Regarding to your question, can you exp= lain more about:

    (1) from nodeA to nodeB is one hop or m= ulti-hop?

    (2) installing the route with hard cell= s or soft cells?

    (3) what "conflict during route in= stallation" mean? what kind of conflict?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 10:16 PM, Raghu= ram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of tho= ught. I agree with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain informatio= n from 6top. Obviously, 6top will expose these interfaces in its standard i= mplementation.

    =A0

    Do you think finding the common require= ments from 6top to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

    =A0

    The different flows you have identified= is perfect.=A0

    (1) The flows from 6top -> L2 have b= een addressed quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements o= f PCE, RPL, (probably v6ND) in terms of parameters required for route compu= tation to define the general requirements for flows between L3 and 6top. In the d= raft, you have already addressed some RPL specific primitives like control = message delivery. I think this should go in the RPL specific part. We defin= e primitives to expose parameters required by L3 to perform route computation in the general flows. For e.g.= L2 neighbor list, link quality to each neighbor. We need to specify the me= ssage format that needs to used by L3 to obtain this info.=

    (3) We will also need 6top->L3 flows= to be defined. For e.g., in the RPL case, =A0GET_RPL_PARENT will be= one such flow as 6top needs to provide the primitive GET_TIMING_PARENT = in the L2->6top flow. A similar primitive needs to be there for PCE.

    =A0

    (Note: when I say L2 -> 6top flow, I= mean L2 is the data requestor entity and 6top is the data provider. This i= s my own convention and hence the clarification)

    =A0

    Another critical part I want to get you= r opinions on is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

    =A0

    =A0

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

    =A0

    Hi Raghuram,

    =A0

    Sorry for the late response. It is welc= ome for you to add flow information if necessary.

    =A0

    Just one thing I want to understand mor= e clearly. I think 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct?=A0

    =A0

    In this sense, we should separate the g= eneral flow information to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

    =A0

    (1) flow information with L2, i.e. TSCH=

    (2) general flow information with upper= layer, may be L3 or L2.5

    (3) flow information with specific uppe= r layer protocol like RPL.

    =A0

    What do you think?=

    =A0

    Qin=A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 6:10 AM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Ok.=A0

    =A0

    Qin, if you are OK I can add the flow i= nformation specific to RPL.=A0

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

    =A0

    Hi Raghu= ram,

    I let Qin answer as she is the main aut= hor. My opinion is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

    =A0

    On Wed, Aug 14, 2013 at 1:42 PM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some informatio= n that needs to be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin&= #39;s draft. I wanted to check with you guys if you want to add to the same= document or split it into a separate RFC. When I say split into separate R= FC, =A0what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information abou= t L2 to 6top. I could add more about the RPL to 6top is its OK..<= /u>

    =A0<= /p>

    -raghuram

    =A0

    =A0

    =A0

    =A0

    =A0


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Sat, 17 Aug 2013 06:33:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.933 X-Spam-Level: X-Spam-Status: No, score=-2.933 tagged_above=-999 required=5 tests=[AWL=0.043, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W9Cpy-zEl8Bh for <6tsch@ietfa.amsl.com>; Sat, 17 Aug 2013 06:33:08 -0700 (PDT) Received: from mail-ve0-f180.google.com (mail-ve0-f180.google.com [209.85.128.180]) by ietfa.amsl.com (Postfix) with ESMTP id CFCF311E80F8 for <6tsch@ietf.org>; Sat, 17 Aug 2013 06:33:07 -0700 (PDT) Received: by mail-ve0-f180.google.com with SMTP id pb11so490169veb.39 for <6tsch@ietf.org>; Sat, 17 Aug 2013 06:33:07 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=D0ay1y77rJK//tYPJFsbfShouqvM07lESdwvJtMkPvg=; b=UIjdIQAnxnVSsf9MfStZvxjuMAo4TYdqGUN940ryDH+7kEQD4O/Z2Pq8/q2FWwMYTR irKZi2aqn6Ii1SfwydRET55DukN4j0xBK1nwoO/60HOS7eHKj4Bfplhh6gI80j0tcfD7 xV9a0PI0sGbU2jd7N2OprSA3ElqIxM4DW961EBQirqRkH78ti4RiLZVyVyUB7shH91u/ f+1urSVl519Z2fQV5vLXhlAc0q0Fe6gow/+8zQ5OuvQkGunNpDBf0TrgihMA32yjyhxO VkfXaf1qeOairh7yvZSrwLwTTxFXmxfVKg8vewQFxdrn1O1dCHFctpYf+RmW/u8a3XH4 A3hg== X-Gm-Message-State: ALoCoQnqBlkLGAz2JnXFF2jXALQFV/iTg01YRABU5Hbv51pqtLJMU+RrZhdGzYmlIGzQv54CvSEX MIME-Version: 1.0 X-Received: by 10.58.75.41 with SMTP id z9mr3129726vev.4.1376746386686; Sat, 17 Aug 2013 06:33:06 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Sat, 17 Aug 2013 06:33:06 -0700 (PDT) In-Reply-To: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57@xmb-rcd-x04.cisco.com> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852EC57@xmb-rcd-x04.cisco.com> Date: Sat, 17 Aug 2013 21:33:06 +0800 Message-ID: From: Qin Wang To: "Raghuram Sudhaakar (rsudhaak)" Content-Type: multipart/related; boundary=089e012942aa53189104e424bf33 Cc: "6tsch@ietf.org" <6tsch@ietf.org>, "P.Zand@utwente.nl" Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Aug 2013 13:33:13 -0000 --089e012942aa53189104e424bf33 Content-Type: multipart/alternative; boundary=089e012942aa53188f04e424bf32 --089e012942aa53188f04e424bf32 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Raghuram, In the Table 44g=97MLME-SET-LINK.confirm parameters of IEEE802.15.4e, the status value is defined as follows. SUCCESS, INVALID_PARAMETER, UNKNOWN_LINK, MAX_LINKS_EXCEEDED It does not include the factors like Cell Conflict, which are introduced in 6top. Make sense? Qin On Fri, Aug 16, 2013 at 10:53 PM, Raghuram Sudhaakar (rsudhaak) < rsudhaak@cisco.com> wrote: > Qin, Pouria, > The message flow diagram idescribes the scenario perfectly. I think it > should go in the document or at least in an appendix to the document. I > would make one change though, instead of have two command from L3 to 6top > (create hard cell, create soft cell) we can have only one command (instal= l > route) and depending on the type of L3 6top decides whether to create a > hard or soft cell. This will help 6top ensure that there are minimal > conflicts (as pointed out already in this discussion) and in future we ma= y > be able to work with PCE and RPL simultaneously. This scenario of working > with multiple L3's may occur when there are multiple overlay/logical > networks are being created over the same physical network. > > The only caveat to this though is that we need to define a command from > L3 to 6top that will help 6top identify the L3 protocol. Or we could also > include a L3 protocol type field in every message from L3 -> 6top. > > Qin mentioned that the status returned by L2 for the the slot > installation process can be forwarded to L3 by 6top but in some cases we > may there may be other factors also. I thought about this but I can't > identify what other factors might affect the reply the 6top will send to > L3. Can you please identify what factors you had in mind. I think it is > important we nail down this flow very clearly and take care of all edge > cases. > > -raghuram > > From: "P.Zand@utwente.nl" > Date: Friday, August 16, 2013 6:24 AM > To: "qinwang@berkeley.edu" > Cc: raghuram sudhaakar , "6tsch@ietf.org" < > 6tsch@ietf.org> > Subject: RE: Message flows > > Qin,**** > > ** ** > > I completely agree with you that the status of the report/confirm form > 6top to higher layer might be changed by other factors as well. My point = is > that, one of those factors, is the status of =93.confirm=94 primitives re= ceived > form L2. I think in 6top, we have to add them to the list of the factors > that effect on the reply/confirm to higher layer. Am I right? **** > > ** ** > > Regarding to (1), I think, when the 6top commands/primitives are called b= y > higher layer (either by PCE, potential signaling protocol, or temporary b= y > RPL in the lack of signaling protocol) we have to send a =93.confirm=94 t= o > inform them about the status of their requests. Am I right? I would say > that in some cases we might need to send the confirmation to PCE with the > FAIL status.**** > > ** ** > > Regarding to (3), I agree that the signaling protocol and PCE should call > the cell creation commands/primitives. Do you agree that 6top should be > independent form the higher layer that has called its primitives/command? > Is there any limitation that in the lack of signaling protocol, the RPL > can=92t call some of the 6top=92 management commands/primitives (e.g. *So= ft > cell creation*)? In this case, we might need to reply to RPL, by SUCCESS > or FAIL status? Did I miss anything?**** > > ** ** > > Pouria**** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu ] > *Sent:* Friday, August 16, 2013 2:05 PM > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > ** ** > > Hi Pouria,**** > > ** ** > > It is the process to create a hard cell and slotframe. You see, =93MLME-= SET-SLOTFRAME.confirm=94 > and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usu= ally > is one of factors to generate the confirmation message to higher layer. I= n > another word, when the status returned by =93MLME-SET-SLOTFRAME.confirm= =94 or > =93MLME-SET-LINK.confirm=94 is False, the status reported from 6top to hi= gher > layer must be False. But, there may be some other factors also making the > status False.**** > > ** ** > > Make sense?**** > > ** ** > > Qin**** > > ** ** > > On Fri, Aug 16, 2013 at 7:44 AM, wrote:**** > > Hi Qin,**** > > Regarding to (2), this is my understanding from the procedure for creatin= g > a hard cell and slotframe. Am I missing something from 6top?**** > > **** > > **** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Friday, August 16, 2013 12:32 AM > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > **** > > Hi Raghuram and Pouria,**** > > **** > > The following is my understanding.**** > > **** > > (1) Taking the assumption in Raghuram's example, i.e. installing a route > with hard cells, then, some role like PCE should exist and take > responsibility to make conflict-free. In another word, the scenario > described in the Raghuram's example should not happen. (But, it doesn't > mean a confirmation message is not needed, see the following) .**** > > **** > > (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are > primitives of 802.15.4e. The confirmation to upper layer should come from > the execution of 6top commands, which may related with the two 15.4e > primitives, but not exactly same.**** > > **** > > (3) RPL is a routing protocol. It uses the TSCH schedule to forward > packets, no matter the schedule is installed by PCE (hard cell) , or by > some reservation protocol like RSVP (soft cell).**** > > **** > > Make sense?**** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > **** > > On Fri, Aug 16, 2013 at 5:52 AM, wrote:**** > > Hi Raghuram, Qin,**** > > Let me enter to your discussion**** > > I agree with Raghuram that when the higher layer call the 6top=92s comman= ds > (or .requests primitives) it should be informed about the status of its > request by =93command reply=94 or =93.confirm=94 primitives. The status o= f the > =93.confirm=94 or =93reply=94 can be success, failure or =85**** > > Am I right?**** > > I couldn=92t either find the 6top=92s behavior upon receiving the > =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitive= s that > might be called by L2. Did I miss that?**** > > **** > > Raghuram, I just have one minor comment, in your example. I think that th= e > RPL (L3) should use the =93Create soft cell command=94 to ask a new cell > without specifying the exact cell. Because the L3 does not have enough > information to ask for reserving specific cell in L2. The =93Create hard = cell > command=94 should be called by the one who has the global knowledge on > network schedules, like PCE. However, I agree that the PCE by calling the > =93Create hard cell command=94 or RPL by calling =93Create soft cell comm= and=94 > should be informed by 6top about the status of its request. For example, = It > might happen that PCE send a same request twice or RPL=92s request can=92= t be > serviced. **** > > AM I right?**** > > **** > > Pouria. **** > > **** > > *From:*6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Raghuram Sudhaakar (rsudhaak) > *Sent:* Thursday, August 15, 2013 9:07 PM > *To:* Qin Wang > *Cc:* 6tsch@ietf.org > *Subject:* Re: [6tsch] Message flows**** > > **** > > HI Qin,**** > > The conflicts I am referring to are -**** > > **** > > Consdiering multihop communication and hard-cells**** > > 1. Route 1 requires a particular set of slots to be setup. Say node A > must listen on slot number 11, 34, 65 and Tx on 13, 35, 68**** > 2. But another route 2 requires node A to listen on slot 35. **** > > There may be other such conflicts that we may need to resolve.**** > > **** > > -raghuram**** > > **** > > **** > > Hi Raghuram, **** > > **** > > I totally agree to your approach to define the flow information to L3.***= * > > **** > > Regarding to your question, can you explain more about:**** > > (1) from nodeA to nodeB is one hop or multi-hop?**** > > (2) installing the route with hard cells or soft cells?**** > > (3) what "conflict during route installation" mean? what kind of conflict= ? > **** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Qin,**** > > I have pretty much the same line of thought. I agree with the point that > 6top is independent from L3. What we are trying to do is define what L3 > will need to implement to obtain information from 6top. Obviously, 6top > will expose these interfaces in its standard implementation.**** > > **** > > Do you think finding the common requirements from 6top to L3 flows betwee= n > RPL and PCE is a good place to start? I am sure there are going to be som= e > specific requirements for each but they can be added as PCE or RPL specif= ic > primitives. I am not suggesting that we implement specific primitives for > every L3 protocol, but once we cover RPL and PCE I think we will satisfy > the requirements of most L3s.**** > > **** > > The different flows you have identified is perfect. **** > > (1) The flows from 6top -> L2 have been addressed quite extensively in th= e > draft already. There are a few flows from L2 -> 6top that have to be > addressed. GET_*TIMING_P*ARENT for e..g.**** > > (2) I would consider the requirements of PCE, RPL, (probably v6ND) in > terms of parameters required for route computation to define the general > requirements for flows between L3 and 6top. In the draft, you have alread= y > addressed some RPL specific primitives like control message delivery. I > think this should go in the RPL specific part. We define primitives to > expose parameters required by L3 to perform route computation in the > general flows. For e.g. L2 neighbor list, link quality to each neighbor. = We > need to specify the message format that needs to used by L3 to obtain thi= s > info.**** > > (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL > case, GET_*RPL_*PARENT will be one such flow as 6top needs to provide > the primitive GET_*TIMING_*PARENT in the L2->6top flow. A similar > primitive needs to be there for PCE.**** > > **** > > (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity > and 6top is the data provider. This is my own convention and hence the > clarification)**** > > **** > > Another critical part I want to get your opinions on is the following. We > have decided that irrespective of L3 (PCE or RPL) a node A will initiate > route installation request when it has data to send to node B. In this ca= se > -**** > > 1. How do resolve conflict during route installation? L3 computes a > route and send it over to 6top. Which in turn converts it to slot > reservations using the 6top -> L2 primitives in the slot frame. What i= f > there is a conflict during this slot reservation? What are the message= s > that will inform L3 and the node that route installation failed? This = must > also cause L3 to recompute its route.**** > 2. Then we have to ask, does 6top provide a mechanism to inform L3 > about failure and obtain a recomputed route (i.e.) perform n number of > retries. Or just fail after one try and leave it to the node to reinit= iate > a route request. **** > > -raghuram**** > > **** > > **** > > *From: *Qin Wang > *Date: *Thursday, August 15, 2013 6:00 AM > *To: *raghuram sudhaakar > *Cc: *"xvilajosana@eecs.berkeley.edu" > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram, **** > > **** > > Sorry for the late response. It is welcome for you to add flow informatio= n > if necessary.**** > > **** > > Just one thing I want to understand more clearly. I think 6top is a > relatively independent sublayer from upper layer. RPL is used as upper > layer in the first step, but, just one kind of upper layers in the future= . > Correct? **** > > **** > > In this sense, we should separate the general flow information to upper > layer and the specific flow information to RPL. Then, can we organize the > flow information related to 6top in this way?**** > > **** > > (1) flow information with L2, i.e. TSCH**** > > (2) general flow information with upper layer, may be L3 or L2.5**** > > (3) flow information with specific upper layer protocol like RPL.**** > > **** > > What do you think?**** > > **** > > Qin **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Ok. **** > > **** > > Qin, if you are OK I can add the flow information specific to RPL. **** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: *"xvilajosana@eecs.berkeley.edu" > > *Date: *Wednesday, August 14, 2013 2:32 PM > *To: *raghuram sudhaakar > *Cc: *Qin Wang > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram,**** > > I let Qin answer as she is the main author. My opinion is that by now we > keep the document as a single file but we separate the two message flows. > IMHO, if you have information to add it is more than welcome! > > X**** > > **** > > On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Xavi, Qin,**** > > I believe that there is some information that needs to be added to the > message flows that will occur between L3 -> 6top and L2 -> 6top, in > addition to what is already there in Qin's draft. I wanted to check with > you guys if you want to add to the same document or split it into a > separate RFC. When I say split into separate RFC, what I mean is, L3 to > 6top is one RFC and L2 to 6top is another. The current draft has a lot of > information about L2 to 6top. I could add more about the RPL to 6top is i= ts > OK..**** > > **** > > -raghuram**** > > **** > > **** > > **** > > **** > > ** ** > --089e012942aa53188f04e424bf32 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Raghuram,

    In the=A0Table 44g=97MLME-= SET-LINK.confirm parameters of IEEE802.15.4e, the status value is defined a= s follows.

    SUCCESS,
    INVALID_PARAMET= ER,
    UNKNOWN_LINK,
    MAX_LINKS_EXCEEDED

    <= div>It does not include the factors like Cell Conflict, which are introduce= d in 6top.

    Make sense?

    Qin


    On Fri, Aug 16, 2013 at 10:53 PM, Raghuram Sudhaakar (rsudhaak) <rsudha= ak@cisco.com> wrote:
    Qin, Pouria,
    The message flow diagram idescribes the scena= rio perfectly. I think it should go in the document or at least in an appen= dix to the document. I would make one change though, instead of have two co= mmand from L3 to 6top (create hard cell, create soft cell) we can have only one comma= nd (install route) and depending on the type of L3 6top decides whether to = create =A0a hard or soft cell. This will help 6top ensure that there are mi= nimal conflicts (as pointed out already in this discussion) and in future we may be able to work with PCE and RPL = simultaneously. This scenario of working with multiple L3's may occur w= hen there are multiple overlay/logical networks are being created over the = same physical network.

    The only caveat to this though is that = we need to define a command from L3 to 6top that will help 6top identify th= e L3 protocol. Or we could also include a L3 protocol type field in every m= essage from L3 -> 6top.

    Qin mentioned that the status returned = by L2 for the the slot installation process can be forwarded to L3 by 6top = but in some cases we may there may be other factors also. I thought about t= his but I can't identify what other factors might affect the reply the 6top wi= ll send to L3. Can you please identify what factors you had in mind. I thin= k it is important we nail down this flow very clearly and take care of all = edge cases.

    -raghuram

    From: "P.Zand@utwente.nl" <P.Zand@utwente.nl>
    Date: Friday, August 16, 2013 6:24 = AM
    To: "qinwang@berkeley.edu" <qinwang@berkeley.edu= >
    Cc: raghuram sudhaakar <rsudhaak@cisco.com>= , "6tsch@ietf.org<= /a>" <6tsch@iet= f.org>
    Subject: RE: Message flows

    Qin,

    =A0

    I completely agree with you that the status = of the report/confirm form 6top to higher layer might be changed by other f= actors as well. My point is that, one of those factors, is the status of =93.confirm=94 primitives rec= eived form L2. I think in 6top, we have to add them to the list of the fact= ors that effect on the reply/confirm to higher layer. Am I right?=A0=A0

    =A0

    Regarding to (1), I think, when the 6top com= mands/primitives are called by higher layer (either by PCE, potential signa= ling protocol, or temporary by RPL in the lack of signaling protocol) we have to send a =93.confirm=94= to inform them about the status of their requests. Am I right? I would say= that in some cases we might need to send the confirmation to PCE with the = FAIL status.

    =A0

    Regarding to (3), I agree that the signaling= protocol and PCE should call the cell creation commands/primitives. Do you= agree that 6top should be independent form the higher layer that has called its primitives/command? = Is there any limitation that in the lack of signaling protocol, the RPL can= =92t call some of the 6top=92 management commands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

    =A0

    Pouria

    =A0

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Pouria,

    =A0

    It is the process to create a hard cell and slotfram= e. You see,=A0=A0=93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET= -LINK.confirm=94 generates confirmation from L2, which usually is one of factors to generate the confirmation mess= age to higher layer. In another word, when the status returned by=A0=A0=93M= LME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 is False, the s= tatus reported from 6top to higher layer must be False. But, there may be some other factors also making the status Fals= e.

    =A0

    Make sense?

    =A0

    Qin

    =A0

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:=

    Hi Qin,

    Regarding to (2), this is my understanding f= rom the procedure for creating a hard cell and slotframe. Am I missing something from 6top?

    =A0

    Best Wishes,

    Pouria

    =A0

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Raghuram and Pouria,

    =A0

    The following is my understanding.

    =A0

    (1) Taking the assumption in Raghuram's example,= i.e. installing a route with hard cells, then, some role like PCE should e= xist and take responsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should = not happen. (But, it doesn't mean a confirmation message is not needed,= see the following) .

    =A0

    (2)=A0=A0=93MLME-SET-SLOTFRAME.confirm=94 = and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4e. The confirmation to upper layer should come from the execution of 6top com= mands, which may related with the two 15.4e primitives, but not exactly sam= e.

    =A0

    (3) RPL is a routing protocol. It uses the TSCH sche= dule to forward packets, no matter the schedule is installed by PCE (hard c= ell) , or by some reservation protocol like RSVP (soft cell).

    =A0

    Make sense?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:=

    Hi Raghuram, Qin,

    Let me enter to your discussion

    I agree with Raghuram that when the higher l= ayer call the 6top=92s commands (or .requests primitives) it should be informed about the status of its request by =93co= mmand reply=94 or =93.confirm=94 primitives. The status of the =93.confirm= =94 or =93reply=94 can be success, failure or =85

    Am I right?

    I couldn=92t either find the 6top=92s behavi= or upon receiving the =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitives that might be called by L2. Did = I miss that?

    =A0

    Raghuram, I just have one minor comment, in = your example. I think that the RPL (L3) should use the =93Create soft cell command=94 to ask a new cell without specifyin= g the exact cell. Because the L3 does not have enough information to ask fo= r reserving specific cell in L2. The =93Create hard cell command=94 should = be called by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by= calling the =93Create hard cell command=94 or RPL by calling =93Create sof= t cell command=94 should be informed by 6top about the status of its reques= t. For example, It might happen that PCE send a same request twice or RPL=92s request can=92t be serviced. <= u>

    AM I right?

    =A0

    Pouria.=A0=A0=A0=A0=A0

    =A0

    From:6= tsch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

    =A0

    HI Qin,

    The conflicts I am referring to are -

    =A0

    Consdiering multihop communication and hard-cells=

    1. Route 1 req= uires a particular set of slots to be setup. Say node A must listen on slot= number 11, 34, 65 and Tx on 13, 35, 68
    2. But another= route 2 requires node A to listen on slot 35.=A0
      3. =

    There may be other such conflicts that we may need to resolve.<= /span>

    =A0

    -raghuram

    =A0

    =A0

    Hi Raghuram,

    =A0

    I totally agree to your approach to define the flow information= to L3.

    =A0

    Regarding to your question, can you explain more about:<= u>

    (1) from nodeA to nodeB is one hop or multi-hop?<= u>

    (2) installing the route with hard cells or soft cells?<= u>

    (3) what "conflict during route installation" mean? w= hat kind of conflict?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak)= <rsudhaak@cisco= .com> wrote:

    Qin,

    I have pretty much the same line of thought. I agree with the p= oint that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain inform= ation from 6top. Obviously, 6top will expose these interfaces in its standa= rd implementation.

    =A0

    Do you think finding the common requirements from 6top to L3 fl= ows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

    =A0

    The different flows you have identified is perfect.=A0

    (1) The flows from 6top -> L2 have been addressed quite exte= nsively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements of PCE, RPL, (probably v6= ND) in terms of parameters required for route computation to define the general requirements for flows between L3 and 6t= op. In the draft, you have already addressed some RPL specific primitives l= ike control message delivery. I think this should go in the RPL specific pa= rt. We define primitives to expose parameters required by L3 to perform route computation in the general flow= s. For e.g. L2 neighbor list, link quality to each neighbor. We need to spe= cify the message format that needs to used by L3 to obtain this info.

    (3) We will also need 6top->L3 flows to be defined. For e.g.= , in the RPL case, =A0GET_RPL_PARENT will be one such flow as 6top needs to provide the primitive GET_TIMING_PAR= ENT in the L2->6top flow. A similar primitive needs to be there for PCE.=

    =A0

    (Note: when I say L2 -> 6top flow, I mean L2 is the data req= uestor entity and 6top is the data provider. This is my own convention and hence the clarification)

    =A0

    Another critical part I want to get your opinions on is the fol= lowing. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do reso= lve conflict during route installation? L3 computes a route and send it ove= r to 6top. Which in turn converts it to slot reservations using the 6top -&= gt; L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we hav= e to ask, does 6top provide a mechanism to inform L3 about failure and obta= in a recomputed route (i.e.) perform n number of retries. Or just fail afte= r one try and leave it to the node to reinitiate a route request.

    -raghuram

    =A0

    =A0

    From: Qi= n Wang <qinwan= g@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

    =A0

    Hi Raghuram,

    =A0

    Sorry for the late response. It is welcome for you to add flow = information if necessary.

    =A0

    Just one thing I want to understand more clearly. I think 6top = is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct?=A0

    =A0

    In this sense, we should separate the general flow information = to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

    =A0

    (1) flow information with L2, i.e. TSCH

    (2) general flow information with upper layer, may be L3 or L2.= 5

    (3) flow information with specific upper layer protocol like RP= L.

    =A0

    What do you think?

    =A0

    Qin=A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) = <rsudhaak@cisco.= com> wrote:

    Ok.=A0

    =A0

    Qin, if you are OK I can add the flow information specific to R= PL.=A0

    =A0

    -raghuram

    =A0

    From: Xa= vier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

    =A0

    Hi Raghuram,

    I let Qin answer as she is the main author. My opinion is that = by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

    =A0

    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) = <rsudhaak@cisco.= com> wrote:

    Xavi, Qin,

    I believe that there is some information that needs to be added= to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Q= in's draft. I wanted to check with you guys if you want to add to the s= ame document or split it into a separate RFC. When I say split into separat= e RFC, =A0what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information = about L2 to 6top. I could add more about the RPL to 6top is its OK..=

    =A0

    -raghuram

    =A0

    =A0

    =A0

    =A0

    =A0


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17 Aug 2013 08:56:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.164 X-Spam-Level: X-Spam-Status: No, score=0.164 tagged_above=-999 required=5 tests=[AWL=-0.333, BAYES_00=-2.599, EXTRA_MPART_TYPE=1, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oL1UItWedaNW for <6tsch@ietfa.amsl.com>; Sat, 17 Aug 2013 08:56:17 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 09C1C21F9D0F for <6tsch@ietf.org>; Sat, 17 Aug 2013 08:56:15 -0700 (PDT) Received: from EXHUB02.ad.utwente.nl (130.89.4.229) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Sat, 17 Aug 2013 17:56:18 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB02.ad.utwente.nl ([130.89.4.229]) with mapi id 14.02.0328.009; Sat, 17 Aug 2013 17:56:13 +0200 From: To: Thread-Topic: Message flows Thread-Index: AQHOmS7T2+M8VWnoB0iALAow4p1lsJmVjRCA//+VLYCAAW4AgP//n/gAgACPZID//8GzAAAJ+CqA///pcYD//8tEoIABF+YA///KPoCAAdyAgP//soVA Date: Sat, 17 Aug 2013 15:56:12 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0A@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/related; boundary="_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0AEXMBX23adutwent_"; type="multipart/alternative" MIME-Version: 1.0 Cc: rsudhaak@cisco.com, 6tsch@ietf.org Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Aug 2013 15:56:25 -0000 --_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0AEXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0AEXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0AEXMBX23adutwent_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Qin, I agree with starting a new threat and discuss about the details of the con= trol flows. Regarding to the interface between 6top and higher layer (e.g. RPL), Let me= explain my point with an example: Let's consider a new joined device, node= A, that needs some cells to start sending its RPL control packets to its p= arent node B. How does node A, upon choosing a new parent (node B), can res= erve cells (e.g. for exchanging RPL control packets like DAO or DIO)? How d= oes node B (or node B' parent), who has just received node A' DAO packet as= its children, can reserve extra cells toward their parent. In the lack of = signaling protocol and without installing a track, is there any primitive t= hat the RPL or 6top can use, to reserve some cells locally based on it DAO = and DIO packet rates with their parents? In order to handle this situation in 6top, don't we need to import some inf= ormation from the parent table and route table (in storing mode) from L3 to= 6top? I mean how does a RPL parent inform 6top about its children and desc= endants numbers and the potential control messages rate (e.g. DAO) that it = should forward toward the DODAG root? In addition how does the new device i= nform the 6top about its new parent? You might say that DAO and DIO transmission rate might changes overtime and= reserving resources doesn't make sense. But let's consider RPL control pac= kets just as an example. Am I missing anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Saturday, August 17, 2013 3:18 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Pouira, I see your point. In the task item-1 "Timeslot Management methods and forma= ts", control flows will be defined (See the record for teleconference on 8/= 9). We can address the issue you mentioned above in that document. Maybe we= should start a thread to discuss what the control flows should be, what th= e message contents should be. Regarding to the interface between 6top and RPL, my understanding is RPL ju= st use the TSCH schedule, instead of building the schedule by using somethi= ng like Soft cell creation. But, maybe, the status of TSCH schedule can be = taken as a factor of RPL's OF. What do you think? Qin On Fri, Aug 16, 2013 at 9:24 PM, > wrote: Qin, I completely agree with you that the status of the report/confirm form 6top= to higher layer might be changed by other factors as well. My point is tha= t, one of those factors, is the status of ".confirm" primitives received fo= rm L2. I think in 6top, we have to add them to the list of the factors that= effect on the reply/confirm to higher layer. Am I right? Regarding to (1), I think, when the 6top commands/primitives are called by = higher layer (either by PCE, potential signaling protocol, or temporary by = RPL in the lack of signaling protocol) we have to send a ".confirm" to info= rm them about the status of their requests. Am I right? I would say that in= some cases we might need to send the confirmation to PCE with the FAIL sta= tus. Regarding to (3), I agree that the signaling protocol and PCE should call t= he cell creation commands/primitives. Do you agree that 6top should be inde= pendent form the higher layer that has called its primitives/command? Is th= ere any limitation that in the lack of signaling protocol, the RPL can't ca= ll some of the 6top' management commands/primitives (e.g. Soft cell creatio= n)? In this case, we might need to reply to RPL, by SUCCESS or FAIL status?= Did I miss anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 2:05 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Pouria, It is the process to create a hard cell and slotframe. You see, "MLME-SET-= SLOTFRAME.confirm" and "MLME-SET-LINK.confirm" generates confirmation from = L2, which usually is one of factors to generate the confirmation message to= higher layer. In another word, when the status returned by "MLME-SET-SLOT= FRAME.confirm" or "MLME-SET-LINK.confirm" is False, the status reported fro= m 6top to higher layer must be False. But, there may be some other factors = also making the status False. Make sense? Qin On Fri, Aug 16, 2013 at 7:44 AM, > wrote: Hi Qin, Regarding to (2), this is my understanding from the procedure for creating = a hard cell and slotframe. Am I missing something from 6top? [cid:image001.jpg@01CE9B73.0E018CD0] Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 12:32 AM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Raghuram and Pouria, The following is my understanding. (1) Taking the assumption in Raghuram's example, i.e. installing a route wi= th hard cells, then, some role like PCE should exist and take responsibilit= y to make conflict-free. In another word, the scenario described in the Rag= huram's example should not happen. (But, it doesn't mean a confirmation mes= sage is not needed, see the following) . (2) "MLME-SET-SLOTFRAME.confirm" and "MLME-SET-LINK.confirm" are primitive= s of 802.15.4e. The confirmation to upper layer should come from the execut= ion of 6top commands, which may related with the two 15.4e primitives, but = not exactly same. (3) RPL is a routing protocol. It uses the TSCH schedule to forward packets= , no matter the schedule is installed by PCE (hard cell) , or by some reser= vation protocol like RSVP (soft cell). Make sense? Thanks Qin On Fri, Aug 16, 2013 at 5:52 AM, > wrote: Hi Raghuram, Qin, Let me enter to your discussion I agree with Raghuram that when the higher layer call the 6top's commands (= or .requests primitives) it should be informed about the status of its requ= est by "command reply" or ".confirm" primitives. The status of the ".confir= m" or "reply" can be success, failure or ... Am I right? I couldn't either find the 6top's behavior upon receiving the "MLME-SET-SLO= TFRAME.confirm" or "MLME-SET-LINK.confirm" primitives that might be called = by L2. Did I miss that? Raghuram, I just have one minor comment, in your example. I think that the = RPL (L3) should use the "Create soft cell command" to ask a new cell withou= t specifying the exact cell. Because the L3 does not have enough informatio= n to ask for reserving specific cell in L2. The "Create hard cell command" = should be called by the one who has the global knowledge on network schedul= es, like PCE. However, I agree that the PCE by calling the "Create hard cel= l command" or RPL by calling "Create soft cell command" should be informed = by 6top about the status of its request. For example, It might happen that = PCE send a same request twice or RPL's request can't be serviced. AM I right? Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Raghuram Sudha= akar (rsudhaak) Sent: Thursday, August 15, 2013 9:07 PM To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0AEXMBX23adutwent_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Hi Qin,=

     <= /p>

    I agree with starting a n= ew threat and discuss about the details of the control flows.

     <= /p>

     <= /p>

    Regarding to the interfac= e between 6top and higher layer (e.g. RPL), Let me explain my point with an= example: Let’s consider a new joined device, node A, that needs some cells to start sending its RPL control packets to its parent no= de B. How does node A, upon choosing a new parent (node B), can reserve cel= ls (e.g. for exchanging RPL control packets like DAO or DIO)? How does node= B (or node B’ parent), who has just received node A’ DAO packet as its children, can reserve extra = cells toward their parent. In the lack of signaling protocol and without in= stalling a track, is there any primitive that the RPL or 6top can use, to r= eserve some cells locally based on it DAO and DIO packet rates with their parents?

    In order to handle this s= ituation in 6top, don’t we need to import some information from the p= arent table and route table (in storing mode) from L3 to 6top? I mean how does a RPL parent inform 6top about its children and descendant= s numbers and the potential control messages rate (e.g. DAO) that it should= forward toward the DODAG root? In addition how does the new device inform = the 6top about its new parent? 

    You might say that DAO an= d DIO transmission rate might changes overtime and reserving resources does= n’t make sense. But let’s consider RPL control packets just as an example.

    Am I missing anything?&nb= sp;

     <= /p>

    Pouria<= /p>

     <= /p>

    From: Qin Wang= [mailto:qinwang@berkeley.edu]
    Sent: Saturday, August 17, 2013 3:18 PM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Pouira,

     

    I see your point. In the task item-1 "Timeslot = Management methods and formats", control flows will be defined (See th= e record for teleconference on 8/9). We can address the issue you mentioned= above in that document. Maybe we should start a thread to discuss what the control flows should be, what the message con= tents should be.

     

    Regarding to the interface between 6top and RPL, my = understanding is RPL just use the TSCH schedule, instead of building the sc= hedule by using something like Soft cell creation. But, maybe, the status o= f TSCH schedule can be taken as a factor of RPL's OF. What do you think?

     

    Qin

     

     

     

     

    On Fri, Aug 16, 2013 at 9:24 PM, <P.Zand@utwente.nl> wrote:

    Qin,

     

    I completely agree with you that the st= atus of the report/confirm form 6top to higher layer might be changed by other factors as well. My point is that, one of those factor= s, is the status of “.confirm” primitives received form L2. I t= hink in 6top, we have to add them to the list of the factors that effect on= the reply/confirm to higher layer. Am I right?  

     

    Regarding to (1), I think, when the 6to= p commands/primitives are called by higher layer (either by PCE, potential signaling protocol, or temporary by RPL in the lack of sign= aling protocol) we have to send a “.confirm” to inform them abo= ut the status of their requests. Am I right? I would say that in some cases= we might need to send the confirmation to PCE with the FAIL status.

     

    Regarding to (3), I agree that the sign= aling protocol and PCE should call the cell creation commands/primitives. Do you agree that 6top should be independent form the higher layer that ha= s called its primitives/command? Is there any limitation that in the lack o= f signaling protocol, the RPL can’t call some of the 6top’ mana= gement commands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

     

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM

     

    Hi Pouria,

     

    It is the process to create a hard cell and slotframe. You see,&nb= sp; “MLME-SET-SLOTFRAME.confirm”= ; and “MLME-SET-LINK.confirm” generates confirmation from L2, which = usually is one of factors to generate the confirmation message to higher la= yer. In another word, when the status returned by  “MLME-SE= T-SLOTFRAME.confirm” or “MLME-SET-LINK.confirm” is False,= the status reported from 6top to higher layer must be False. But, there may be= some other factors also making the status False.

     

    Make sense?

     

    Qin

     

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    Regarding to (2), this is my understand= ing from the procedure for creating a hard cell and slotframe. Am I missing something from 6top?

     

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak);     6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Raghuram and Pouria,

     

    The following is my understanding.

     

    (1) Taking the assumption in Raghuram's example, i.e. installing a= route with hard cells, then, some role like PCE should exist and take resp= onsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should not = happen. (But, it doesn't mean a confirmation message is not needed, see the= following) .

     

    (2)  “MLME-SET-SLOTFRAM= E.confirm” and “MLME-SET-LINK.confirm” are primitives of = 802.15.4e. The confirmation to upper layer should come from the execution of 6top commands, which may = related with the two 15.4e primitives, but not exactly same.

     

    (3) RPL is a routing protocol. It uses the TSCH schedule to forwar= d packets, no matter the schedule is installed by PCE (hard cell) , or by s= ome reservation protocol like RSVP (soft cell).

     

    Make sense?

     

    Thanks

    Qin

     

     

     

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Raghuram, Qin,

    Let me enter to your discussion<= o:p>

    I agree with Raghuram that when the hig= her layer call the 6top’s commands (or .requests primitives) it should be informed about the status of its request by “command re= ply” or “.confirm” primitives. The status of the “.= confirm” or “reply” can be success, failure or …

    Am I right?

    I couldn’t either find the 6top&#= 8217;s behavior upon receiving the “MLME-SET-SLOTFRAME.confirm”= or “MLME-SET-LINK.confirm” primitives that might be called by L2. Did I miss that?<= /p>

     

    Raghuram, I just have one minor comment= , in your example. I think that the RPL (L3) should use the “Create soft cell command” to ask a new cell without specifyin= g the exact cell. Because the L3 does not have enough information to ask fo= r reserving specific cell in L2. The “Create hard cell command”= should be called by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he “Create hard cell command” or RPL by calling “Create s= oft cell command” should be informed by 6top about the status of its = request. For example, It might happen that PCE send a same request twice or RPL’s request can’t be serviced. =

    AM I right?

     

    Pouria.     

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

     

    HI Qin,

    The conflicts I am referring to are -

     

    Consdiering multihop communication and hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68=
    2. But another route 2 requires node A to listen on slot 35. = ;

    There may be other such conflicts that we may need to= resolve.

     

    -raghuram

     

     

    Hi Raghuram,

     

    I totally agree to your approach to define the flow i= nformation to L3.

     

    Regarding to your question, can you explain more abou= t:

    (1) from nodeA to nodeB is one hop or multi-hop?

    (2) installing the route with hard cells or soft cell= s?

    (3) what "conflict during route installation&quo= t; mean? what kind of conflict?

     

    Thanks

    Qin

     

     

     

    On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar = (rsudhaak) <rsud= haak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of thought. I agree = with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain informatio= n from 6top. Obviously, 6top will expose these interfaces in its standard i= mplementation.

     

    Do you think finding the common requirements from 6to= p to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

     

    The different flows you have identified is perfect.&n= bsp;

    (1) The flows from 6top -> L2 have been addressed = quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements of PCE, RPL, (p= robably v6ND) in terms of parameters required for route computation to define the general requirements for flows between L3 and 6top. In the d= raft, you have already addressed some RPL specific primitives like control = message delivery. I think this should go in the RPL specific part. We defin= e primitives to expose parameters required by L3 to perform route computation in the general flows. For e.g.= L2 neighbor list, link quality to each neighbor. We need to specify the me= ssage format that needs to used by L3 to obtain this info.

    (3) We will also need 6top->L3 flows to be defined= . For e.g., in the RPL case,  GET_RPL_PARENT will be one such flow as 6top needs to provide the primitive GET_TIMING_PARENT = in the L2->6top flow. A similar primitive needs to be there for PCE.

     

    (Note: when I say L2 -> 6top flow, I mean L2 is th= e data requestor entity and 6top is the data provider. This is my own convention and hence the clarification)

     

    Another critical part I want to get your opinions on = is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

     

     

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

     

    Hi Raghuram,

     

    Sorry for the late response. It is welcome for you to= add flow information if necessary.

     

    Just one thing I want to understand more clearly. I t= hink 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct? 

     

    In this sense, we should separate the general flow in= formation to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

     

    (1) flow information with L2, i.e. TSCH

    (2) general flow information with upper layer, may be= L3 or L2.5

    (3) flow information with specific upper layer protoc= ol like RPL.

     

    What do you think?

     

    Qin 

     

     

     

     

     

     

     

     

     

     

     

     

    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (= rsudhaak) <rsudh= aak@cisco.com> wrote:

    Ok. 

     

    Qin, if you are OK I can add the flow information spe= cific to RPL. 

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

     

    Hi Raghuram,

    I let Qin answer as she is the main author. My opinio= n is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

     

    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (= rsudhaak) <rsudh= aak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some information that needs t= o be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin'= s draft. I wanted to check with you guys if you want to add to the same doc= ument or split it into a separate RFC. When I say split into separate RFC, =  what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information abou= t L2 to 6top. I could add more about the RPL to 6top is its OK..

     

    -raghuram

     

     

     

     

     

     

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qinwang@berkeley.edu Sat Aug 17 14:33:26 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5196E11E8181 for <6tsch@ietfa.amsl.com>; Sat, 17 Aug 2013 14:33:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.939 X-Spam-Level: X-Spam-Status: No, score=-2.939 tagged_above=-999 required=5 tests=[AWL=0.038, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2rHDnjQ8pG9R for <6tsch@ietfa.amsl.com>; Sat, 17 Aug 2013 14:33:20 -0700 (PDT) Received: from mail-vb0-f51.google.com (mail-vb0-f51.google.com [209.85.212.51]) by ietfa.amsl.com (Postfix) with ESMTP id 7B79F11E80F5 for <6tsch@ietf.org>; Sat, 17 Aug 2013 14:33:20 -0700 (PDT) Received: by mail-vb0-f51.google.com with 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<76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0A@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0A@EXMBX23.ad.utwente.nl> Date: Sun, 18 Aug 2013 05:33:19 +0800 Message-ID: From: Qin Wang To: "P.Zand@utwente.nl" Content-Type: multipart/related; boundary=20cf307f3bfab8643304e42b7452 Cc: "Raghuram Sudhaakar \(rsudhaak\)" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Aug 2013 21:33:26 -0000 --20cf307f3bfab8643304e42b7452 Content-Type: multipart/alternative; boundary=20cf307f3bfab8643004e42b7451 --20cf307f3bfab8643004e42b7451 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pouria, According to the new version of Charter, in the current step, we only consider the static case of building TSCH schedule. That means the new node (node B) will use shared cells to send RPL control messages like DAO to the existing node (node A). The set of shared cells will be advertised in EB by node A. And, in the shared cells, node A should be awake for listening (at lease at the beginning of timeslots) . So, even in the lack of signaling protocol and without installing a track, RPL should be able to work. Right? Then, if RPL or other upper layer wants more bandwidth, some centralized/distributed reservation mechanism will be needed. That will be addressed in the next step. What do you think? Qin On Sat, Aug 17, 2013 at 11:56 PM, wrote: > Hi Qin,**** > > ** ** > > I agree with starting a new threat and discuss about the details of the > control flows.**** > > ** ** > > ** ** > > Regarding to the interface between 6top and higher layer (e.g. RPL), Let > me explain my point with an example: Let=92s consider a new joined device= , > node A, that needs some cells to start sending its RPL control packets to > its parent node B. How does node A, upon choosing a new parent (node B), > can reserve cells (e.g. for exchanging RPL control packets like DAO or > DIO)? How does node B (or node B=92 parent), who has just received node A= =92 > DAO packet as its children, can reserve extra cells toward their parent. = In > the lack of signaling protocol and without installing a track, is there a= ny > primitive that the RPL or 6top can use, to reserve some cells locally bas= ed > on it DAO and DIO packet rates with their parents? **** > > In order to handle this situation in 6top, don=92t we need to import some > information from the parent table and route table (in storing mode) from = L3 > to 6top? I mean how does a RPL parent inform 6top about its children and > descendants numbers and the potential control messages rate (e.g. DAO) th= at > it should forward toward the DODAG root? In addition how does the new > device inform the 6top about its new parent? **** > > You might say that DAO and DIO transmission rate might changes overtime > and reserving resources doesn=92t make sense. But let=92s consider RPL co= ntrol > packets just as an example.**** > > Am I missing anything? **** > > ** ** > > Pouria**** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Saturday, August 17, 2013 3:18 PM > > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > ** ** > > Pouira,**** > > ** ** > > I see your point. In the task item-1 "Timeslot Management methods and > formats", control flows will be defined (See the record for teleconferenc= e > on 8/9). We can address the issue you mentioned above in that document. > Maybe we should start a thread to discuss what the control flows should b= e, > what the message contents should be.**** > > ** ** > > Regarding to the interface between 6top and RPL, my understanding is RPL > just use the TSCH schedule, instead of building the schedule by using > something like Soft cell creation. But, maybe, the status of TSCH schedul= e > can be taken as a factor of RPL's OF. What do you think?**** > > ** ** > > Qin**** > > ** ** > > ** ** > > ** ** > > ** ** > > On Fri, Aug 16, 2013 at 9:24 PM, wrote:**** > > Qin,**** > > **** > > I completely agree with you that the status of the report/confirm form > 6top to higher layer might be changed by other factors as well. My point = is > that, one of those factors, is the status of =93.confirm=94 primitives re= ceived > form L2. I think in 6top, we have to add them to the list of the factors > that effect on the reply/confirm to higher layer. Am I right? **** > > **** > > Regarding to (1), I think, when the 6top commands/primitives are called b= y > higher layer (either by PCE, potential signaling protocol, or temporary b= y > RPL in the lack of signaling protocol) we have to send a =93.confirm=94 t= o > inform them about the status of their requests. Am I right? I would say > that in some cases we might need to send the confirmation to PCE with the > FAIL status.**** > > **** > > Regarding to (3), I agree that the signaling protocol and PCE should call > the cell creation commands/primitives. Do you agree that 6top should be > independent form the higher layer that has called its primitives/command? > Is there any limitation that in the lack of signaling protocol, the RPL > can=92t call some of the 6top=92 management commands/primitives (e.g. *So= ft > cell creation*)? In this case, we might need to reply to RPL, by SUCCESS > or FAIL status? Did I miss anything?**** > > **** > > Pouria**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Friday, August 16, 2013 2:05 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > **** > > Hi Pouria,**** > > **** > > It is the process to create a hard cell and slotframe. You see, =93MLME-= SET-SLOTFRAME.confirm=94 > and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usu= ally > is one of factors to generate the confirmation message to higher layer. I= n > another word, when the status returned by =93MLME-SET-SLOTFRAME.confirm= =94 or > =93MLME-SET-LINK.confirm=94 is False, the status reported from 6top to hi= gher > layer must be False. But, there may be some other factors also making the > status False.**** > > **** > > Make sense?**** > > **** > > Qin**** > > **** > > On Fri, Aug 16, 2013 at 7:44 AM, wrote:**** > > Hi Qin,**** > > Regarding to (2), this is my understanding from the procedure for creatin= g > a hard cell and slotframe. Am I missing something from 6top?**** > > **** > > **** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Friday, August 16, 2013 12:32 AM > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > **** > > Hi Raghuram and Pouria,**** > > **** > > The following is my understanding.**** > > **** > > (1) Taking the assumption in Raghuram's example, i.e. installing a route > with hard cells, then, some role like PCE should exist and take > responsibility to make conflict-free. In another word, the scenario > described in the Raghuram's example should not happen. (But, it doesn't > mean a confirmation message is not needed, see the following) .**** > > **** > > (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are > primitives of 802.15.4e. The confirmation to upper layer should come from > the execution of 6top commands, which may related with the two 15.4e > primitives, but not exactly same.**** > > **** > > (3) RPL is a routing protocol. It uses the TSCH schedule to forward > packets, no matter the schedule is installed by PCE (hard cell) , or by > some reservation protocol like RSVP (soft cell).**** > > **** > > Make sense?**** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > **** > > On Fri, Aug 16, 2013 at 5:52 AM, wrote:**** > > Hi Raghuram, Qin,**** > > Let me enter to your discussion**** > > I agree with Raghuram that when the higher layer call the 6top=92s comman= ds > (or .requests primitives) it should be informed about the status of its > request by =93command reply=94 or =93.confirm=94 primitives. The status o= f the > =93.confirm=94 or =93reply=94 can be success, failure or =85**** > > Am I right?**** > > I couldn=92t either find the 6top=92s behavior upon receiving the > =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitive= s that > might be called by L2. Did I miss that?**** > > **** > > Raghuram, I just have one minor comment, in your example. I think that th= e > RPL (L3) should use the =93Create soft cell command=94 to ask a new cell > without specifying the exact cell. Because the L3 does not have enough > information to ask for reserving specific cell in L2. The =93Create hard = cell > command=94 should be called by the one who has the global knowledge on > network schedules, like PCE. However, I agree that the PCE by calling the > =93Create hard cell command=94 or RPL by calling =93Create soft cell comm= and=94 > should be informed by 6top about the status of its request. For example, = It > might happen that PCE send a same request twice or RPL=92s request can=92= t be > serviced. **** > > AM I right?**** > > **** > > Pouria. **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Raghuram Sudhaakar (rsudhaak) > *Sent:* Thursday, August 15, 2013 9:07 PM > *To:* Qin Wang > *Cc:* 6tsch@ietf.org > *Subject:* Re: [6tsch] Message flows**** > > **** > > HI Qin,**** > > The conflicts I am referring to are -**** > > **** > > Consdiering multihop communication and hard-cells**** > > 1. Route 1 requires a particular set of slots to be setup. Say node A > must listen on slot number 11, 34, 65 and Tx on 13, 35, 68**** > 2. But another route 2 requires node A to listen on slot 35. **** > > There may be other such conflicts that we may need to resolve.**** > > **** > > -raghuram**** > > **** > > **** > > Hi Raghuram, **** > > **** > > I totally agree to your approach to define the flow information to L3.***= * > > **** > > Regarding to your question, can you explain more about:**** > > (1) from nodeA to nodeB is one hop or multi-hop?**** > > (2) installing the route with hard cells or soft cells?**** > > (3) what "conflict during route installation" mean? what kind of conflict= ? > **** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Qin,**** > > I have pretty much the same line of thought. I agree with the point that > 6top is independent from L3. What we are trying to do is define what L3 > will need to implement to obtain information from 6top. Obviously, 6top > will expose these interfaces in its standard implementation.**** > > **** > > Do you think finding the common requirements from 6top to L3 flows betwee= n > RPL and PCE is a good place to start? I am sure there are going to be som= e > specific requirements for each but they can be added as PCE or RPL specif= ic > primitives. I am not suggesting that we implement specific primitives for > every L3 protocol, but once we cover RPL and PCE I think we will satisfy > the requirements of most L3s.**** > > **** > > The different flows you have identified is perfect. **** > > (1) The flows from 6top -> L2 have been addressed quite extensively in th= e > draft already. There are a few flows from L2 -> 6top that have to be > addressed. GET_*TIMING_P*ARENT for e..g.**** > > (2) I would consider the requirements of PCE, RPL, (probably v6ND) in > terms of parameters required for route computation to define the general > requirements for flows between L3 and 6top. In the draft, you have alread= y > addressed some RPL specific primitives like control message delivery. I > think this should go in the RPL specific part. We define primitives to > expose parameters required by L3 to perform route computation in the > general flows. For e.g. L2 neighbor list, link quality to each neighbor. = We > need to specify the message format that needs to used by L3 to obtain thi= s > info.**** > > (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL > case, GET_*RPL_*PARENT will be one such flow as 6top needs to provide > the primitive GET_*TIMING_*PARENT in the L2->6top flow. A similar > primitive needs to be there for PCE.**** > > **** > > (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity > and 6top is the data provider. This is my own convention and hence the > clarification)**** > > **** > > Another critical part I want to get your opinions on is the following. We > have decided that irrespective of L3 (PCE or RPL) a node A will initiate > route installation request when it has data to send to node B. In this ca= se > -**** > > 1. How do resolve conflict during route installation? L3 computes a > route and send it over to 6top. Which in turn converts it to slot > reservations using the 6top -> L2 primitives in the slot frame. What i= f > there is a conflict during this slot reservation? What are the message= s > that will inform L3 and the node that route installation failed? This = must > also cause L3 to recompute its route.**** > 2. Then we have to ask, does 6top provide a mechanism to inform L3 > about failure and obtain a recomputed route (i.e.) perform n number of > retries. Or just fail after one try and leave it to the node to reinit= iate > a route request. **** > > -raghuram**** > > **** > > **** > > *From: *Qin Wang > *Date: *Thursday, August 15, 2013 6:00 AM > *To: *raghuram sudhaakar > *Cc: *"xvilajosana@eecs.berkeley.edu" > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram, **** > > **** > > Sorry for the late response. It is welcome for you to add flow informatio= n > if necessary.**** > > **** > > Just one thing I want to understand more clearly. I think 6top is a > relatively independent sublayer from upper layer. RPL is used as upper > layer in the first step, but, just one kind of upper layers in the future= . > Correct? **** > > **** > > In this sense, we should separate the general flow information to upper > layer and the specific flow information to RPL. Then, can we organize the > flow information related to 6top in this way?**** > > **** > > (1) flow information with L2, i.e. TSCH**** > > (2) general flow information with upper layer, may be L3 or L2.5**** > > (3) flow information with specific upper layer protocol like RPL.**** > > **** > > What do you think?**** > > **** > > Qin **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Ok. **** > > **** > > Qin, if you are OK I can add the flow information specific to RPL. **** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: *"xvilajosana@eecs.berkeley.edu" > > *Date: *Wednesday, August 14, 2013 2:32 PM > *To: *raghuram sudhaakar > *Cc: *Qin Wang > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram,**** > > I let Qin answer as she is the main author. My opinion is that by now we > keep the document as a single file but we separate the two message flows. > IMHO, if you have information to add it is more than welcome! > > X**** > > **** > > On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Xavi, Qin,**** > > I believe that there is some information that needs to be added to the > message flows that will occur between L3 -> 6top and L2 -> 6top, in > addition to what is already there in Qin's draft. I wanted to check with > you guys if you want to add to the same document or split it into a > separate RFC. When I say split into separate RFC, what I mean is, L3 to > 6top is one RFC and L2 to 6top is another. The current draft has a lot of > information about L2 to 6top. I could add more about the RPL to 6top is i= ts > OK..**** > > **** > > -raghuram**** > > **** > > **** > > **** > > **** > > **** > > ** ** > --20cf307f3bfab8643004e42b7451 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pouria,

    According to the new version= of Charter, in the current step, we only consider the static case of build= ing TSCH schedule. That means the new node (node B) will use shared cells t= o send RPL control messages like DAO to the existing node (node A). The set= of shared cells will be advertised in EB by node A. And, in the shared cel= ls, node A should be awake for listening (at lease at the beginning of time= slots) . So, even in the lack of signaling protocol and without installing = a track, RPL should be able to work. Right?

    Then, if RPL or other upper layer wants more bandwidth,= some centralized/distributed reservation mechanism will be needed. That wi= ll be addressed in the next step. What do you think?

    Qin




    On Sat, Aug 17, 2013 at 11:56 PM, <P= .Zand@utwente.nl> wrote:

    Hi Qin,

    =A0<= /p>

    I agree with starting a n= ew threat and discuss about the details of the control flows.=

    =A0<= /p>

    =A0<= /p>

    Regarding to the interfac= e between 6top and higher layer (e.g. RPL), Let me explain my point with an= example: Let=92s consider a new joined device, node A, that needs some cells to start sending its RPL control packets to its parent no= de B. How does node A, upon choosing a new parent (node B), can reserve cel= ls (e.g. for exchanging RPL control packets like DAO or DIO)? How does node= B (or node B=92 parent), who has just received node A=92 DAO packet as its children, can reserve extra cell= s toward their parent. In the lack of signaling protocol and without instal= ling a track, is there any primitive that the RPL or 6top can use, to reser= ve some cells locally based on it DAO and DIO packet rates with their parents?

    In order to handle this s= ituation in 6top, don=92t we need to import some information from the paren= t table and route table (in storing mode) from L3 to 6top? I mean how does a RPL parent inform 6top about its children and descendant= s numbers and the potential control messages rate (e.g. DAO) that it should= forward toward the DODAG root? In addition how does the new device inform = the 6top about its new parent?=A0

    You might say that DAO an= d DIO transmission rate might changes overtime and reserving resources does= n=92t make sense. But let=92s consider RPL control packets just as an example.

    Am I missing anything?=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Saturday, August 17, 2013 3:18 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Pouira,

    =A0

    I see your point. In the task item-1 "Timeslot = Management methods and formats", control flows will be defined (See th= e record for teleconference on 8/9). We can address the issue you mentioned= above in that document. Maybe we should start a thread to discuss what the control flows should be, what the message con= tents should be.

    =A0

    Regarding to the interface between 6top and RPL, my = understanding is RPL just use the TSCH schedule, instead of building the sc= hedule by using something like Soft cell creation. But, maybe, the status o= f TSCH schedule can be taken as a factor of RPL's OF. What do you think?

    =A0

    Qin

    =A0

    =A0

    =A0

    =A0

    On Fri, Aug 16, 2013 at 9:24 PM, <P.Zand@utwente.nl> wrote:=

    Qin,=

    =A0<= /p>

    I completely agree with y= ou that the status of the report/confirm form 6top to higher layer might be changed by other factors as well. My point is that, one of those factor= s, is the status of =93.confirm=94 primitives received form L2. I think in = 6top, we have to add them to the list of the factors that effect on the rep= ly/confirm to higher layer. Am I right?=A0=A0

    =A0<= /p>

    Regarding to (1), I think= , when the 6top commands/primitives are called by higher layer (either by PCE, potential signaling protocol, or temporary by RPL in the lack of sign= aling protocol) we have to send a =93.confirm=94 to inform them about the s= tatus of their requests. Am I right? I would say that in some cases we migh= t need to send the confirmation to PCE with the FAIL status.

    =A0<= /p>

    Regarding to (3), I agree= that the signaling protocol and PCE should call the cell creation commands= /primitives. Do you agree that 6top should be independent form the higher layer that ha= s called its primitives/command? Is there any limitation that in the lack o= f signaling protocol, the RPL can=92t call some of the 6top=92 management c= ommands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

    =A0<= /p>

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Pouria,

    =A0

    It is the process to create a hard cell and slotfram= e. You see,=A0=A0=93MLME-SET-SLOTFRAME.confirm= =94 and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usually = is one of factors to generate the confirmation message to higher layer. In = another word, when the status returned by=A0=A0=93MLME-SET-SLOTFRAME.confir= m=94 or =93MLME-SET-LINK.confirm=94 is False, the status reported from 6top to higher layer must be False. But, there may be= some other factors also making the status False.

    =A0

    Make sense?=

    =A0

    Qin<= /p>

    =A0

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:=

    Hi Qin,<= /u>

    Regarding to (2), this is= my understanding from the procedure for creating a hard cell and slotframe= . Am I missing something from 6top?

    =A0<= /p>

    <= u>

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Raghuram and Pouria,

    =A0

    The following is my understanding.

    =A0

    (1) Taking the assumption in Raghuram's example,= i.e. installing a route with hard cells, then, some role like PCE should e= xist and take responsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should = not happen. (But, it doesn't mean a confirmation message is not needed,= see the following) .

    =A0

    (2)=A0=A0=93MLME-SET-SLOT= FRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4= e. The confirmation to upper layer should come from the execution of 6top commands, which may = related with the two 15.4e primitives, but not exactly same.<= u>

    =A0

    (3) RPL is a routing protocol. It uses the TSCH sche= dule to forward packets, no matter the schedule is installed by PCE (hard c= ell) , or by some reservation protocol like RSVP (soft cell).

    =A0

    Make sense?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:=

    Hi Raghuram, Qin,<= u>

    Let me enter to your disc= ussion

    I agree with Raghuram tha= t when the higher layer call the 6top=92s commands (or .requests primitives= ) it should be informed about the status of its request by =93command reply= =94 or =93.confirm=94 primitives. The status of the =93.confirm=94 or =93re= ply=94 can be success, failure or =85

    Am I right?=

    I couldn=92t either find = the 6top=92s behavior upon receiving the =93MLME-SET-SLOTFRAME.confirm=94 o= r =93MLME-SET-LINK.confirm=94 primitives that might be called by L2. Did I miss that?

    =A0<= /p>

    Raghuram, I just have one= minor comment, in your example. I think that the RPL (L3) should use the =93Create soft cell command=94 to ask a new cell without specifying the ex= act cell. Because the L3 does not have enough information to ask for reserv= ing specific cell in L2. The =93Create hard cell command=94 should be calle= d by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he =93Create hard cell command=94 or RPL by calling =93Create soft cell com= mand=94 should be informed by 6top about the status of its request. For exa= mple, It might happen that PCE send a same request twice or RPL=92s request can=92t be serviced.

    AM I right?=

    =A0<= /p>

    Pouria.=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

    =A0

    HI Qin,

    The conflicts I am referring to are -

    =A0

    Consdiering multihop communication and = hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But another route 2 requires node A to listen on slot 35.=A0

    There may be other such conflicts that = we may need to resolve.

    =A0

    -raghuram

    =A0

    =A0

    Hi Raghuram,

    =A0

    I totally agree to your approach to def= ine the flow information to L3.

    =A0

    Regarding to your question, can you exp= lain more about:

    (1) from nodeA to nodeB is one hop or m= ulti-hop?

    (2) installing the route with hard cell= s or soft cells?

    (3) what "conflict during route in= stallation" mean? what kind of conflict?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 10:16 PM, Raghu= ram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of tho= ught. I agree with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain informatio= n from 6top. Obviously, 6top will expose these interfaces in its standard i= mplementation.

    =A0

    Do you think finding the common require= ments from 6top to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

    =A0

    The different flows you have identified= is perfect.=A0

    (1) The flows from 6top -> L2 have b= een addressed quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements o= f PCE, RPL, (probably v6ND) in terms of parameters required for route compu= tation to define the general requirements for flows between L3 and 6top. In the d= raft, you have already addressed some RPL specific primitives like control = message delivery. I think this should go in the RPL specific part. We defin= e primitives to expose parameters required by L3 to perform route computation in the general flows. For e.g.= L2 neighbor list, link quality to each neighbor. We need to specify the me= ssage format that needs to used by L3 to obtain this info.=

    (3) We will also need 6top->L3 flows= to be defined. For e.g., in the RPL case, =A0GET_RPL_PARENT will be= one such flow as 6top needs to provide the primitive GET_TIMING_PARENT = in the L2->6top flow. A similar primitive needs to be there for PCE.

    =A0

    (Note: when I say L2 -> 6top flow, I= mean L2 is the data requestor entity and 6top is the data provider. This i= s my own convention and hence the clarification)

    =A0

    Another critical part I want to get you= r opinions on is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

    =A0

    =A0

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

    =A0

    Hi Raghuram,

    =A0

    Sorry for the late response. It is welc= ome for you to add flow information if necessary.

    =A0

    Just one thing I want to understand mor= e clearly. I think 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct?=A0

    =A0

    In this sense, we should separate the g= eneral flow information to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

    =A0

    (1) flow information with L2, i.e. TSCH=

    (2) general flow information with upper= layer, may be L3 or L2.5

    (3) flow information with specific uppe= r layer protocol like RPL.

    =A0

    What do you think?=

    =A0

    Qin=A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 6:10 AM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Ok.=A0

    =A0

    Qin, if you are OK I can add the flow i= nformation specific to RPL.=A0

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

    =A0

    Hi Raghu= ram,

    I let Qin answer as she is the main aut= hor. My opinion is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

    =A0

    On Wed, Aug 14, 2013 at 1:42 PM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some informatio= n that needs to be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin&= #39;s draft. I wanted to check with you guys if you want to add to the same= document or split it into a separate RFC. When I say split into separate R= FC, =A0what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information abou= t L2 to 6top. I could add more about the RPL to 6top is its OK..<= /u>

    =A0<= /p>

    -raghuram

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0


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17 Aug 2013 15:13:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.197 X-Spam-Level: X-Spam-Status: No, score=0.197 tagged_above=-999 required=5 tests=[AWL=-0.300, BAYES_00=-2.599, EXTRA_MPART_TYPE=1, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2IcJF8tI-HpW for <6tsch@ietfa.amsl.com>; Sat, 17 Aug 2013 15:13:44 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 94AC211E80EA for <6tsch@ietf.org>; Sat, 17 Aug 2013 15:13:41 -0700 (PDT) Received: from EXHUB02.ad.utwente.nl (130.89.4.229) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Sun, 18 Aug 2013 00:13:46 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB02.ad.utwente.nl ([130.89.4.229]) with mapi id 14.02.0328.009; Sun, 18 Aug 2013 00:13:40 +0200 From: To: Thread-Topic: Message flows Thread-Index: AQHOmS7T2+M8VWnoB0iALAow4p1lsJmVjRCA//+VLYCAAW4AgP//n/gAgACPZID//8GzAAAJ+CqA///pcYD//8tEoIABF+YA///KPoCAAdyAgP//soVAABr+/ID//9PRsA== Date: Sat, 17 Aug 2013 22:13:38 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA721D0@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0A@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/related; boundary="_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA721D0EXMBX23adutwent_"; type="multipart/alternative" MIME-Version: 1.0 Cc: rsudhaak@cisco.com, 6tsch@ietf.org Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Aug 2013 22:13:52 -0000 --_004_76EA352C3C95BB42A2C4F2EE6493AD6E4DA721D0EXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA721D0EXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA721D0EXMBX23adutwent_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Qin, Many thanks for your clarification. Agreed, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Saturday, August 17, 2013 11:33 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Pouria, According to the new version of Charter, in the current step, we only consi= der the static case of building TSCH schedule. That means the new node (nod= e B) will use shared cells to send RPL control messages like DAO to the exi= sting node (node A). The set of shared cells will be advertised in EB by no= de A. And, in the shared cells, node A should be awake for listening (at le= ase at the beginning of timeslots) . So, even in the lack of signaling prot= ocol and without installing a track, RPL should be able to work. Right? Then, if RPL or other upper layer wants more bandwidth, some centralized/di= stributed reservation mechanism will be needed. That will be addressed in t= he next step. What do you think? Qin On Sat, Aug 17, 2013 at 11:56 PM, > wrote: Hi Qin, I agree with starting a new threat and discuss about the details of the con= trol flows. Regarding to the interface between 6top and higher layer (e.g. RPL), Let me= explain my point with an example: Let's consider a new joined device, node= A, that needs some cells to start sending its RPL control packets to its p= arent node B. How does node A, upon choosing a new parent (node B), can res= erve cells (e.g. for exchanging RPL control packets like DAO or DIO)? How d= oes node B (or node B' parent), who has just received node A' DAO packet as= its children, can reserve extra cells toward their parent. In the lack of = signaling protocol and without installing a track, is there any primitive t= hat the RPL or 6top can use, to reserve some cells locally based on it DAO = and DIO packet rates with their parents? In order to handle this situation in 6top, don't we need to import some inf= ormation from the parent table and route table (in storing mode) from L3 to= 6top? I mean how does a RPL parent inform 6top about its children and desc= endants numbers and the potential control messages rate (e.g. DAO) that it = should forward toward the DODAG root? In addition how does the new device i= nform the 6top about its new parent? You might say that DAO and DIO transmission rate might changes overtime and= reserving resources doesn't make sense. But let's consider RPL control pac= kets just as an example. Am I missing anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Saturday, August 17, 2013 3:18 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Pouira, I see your point. In the task item-1 "Timeslot Management methods and forma= ts", control flows will be defined (See the record for teleconference on 8/= 9). We can address the issue you mentioned above in that document. Maybe we= should start a thread to discuss what the control flows should be, what th= e message contents should be. Regarding to the interface between 6top and RPL, my understanding is RPL ju= st use the TSCH schedule, instead of building the schedule by using somethi= ng like Soft cell creation. But, maybe, the status of TSCH schedule can be = taken as a factor of RPL's OF. What do you think? Qin On Fri, Aug 16, 2013 at 9:24 PM, > wrote: Qin, I completely agree with you that the status of the report/confirm form 6top= to higher layer might be changed by other factors as well. My point is tha= t, one of those factors, is the status of ".confirm" primitives received fo= rm L2. I think in 6top, we have to add them to the list of the factors that= effect on the reply/confirm to higher layer. Am I right? Regarding to (1), I think, when the 6top commands/primitives are called by = higher layer (either by PCE, potential signaling protocol, or temporary by = RPL in the lack of signaling protocol) we have to send a ".confirm" to info= rm them about the status of their requests. Am I right? I would say that in= some cases we might need to send the confirmation to PCE with the FAIL sta= tus. Regarding to (3), I agree that the signaling protocol and PCE should call t= he cell creation commands/primitives. Do you agree that 6top should be inde= pendent form the higher layer that has called its primitives/command? Is th= ere any limitation that in the lack of signaling protocol, the RPL can't ca= ll some of the 6top' management commands/primitives (e.g. Soft cell creatio= n)? In this case, we might need to reply to RPL, by SUCCESS or FAIL status?= Did I miss anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 2:05 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Pouria, It is the process to create a hard cell and slotframe. You see, "MLME-SET-= SLOTFRAME.confirm" and "MLME-SET-LINK.confirm" generates confirmation from = L2, which usually is one of factors to generate the confirmation message to= higher layer. In another word, when the status returned by "MLME-SET-SLOT= FRAME.confirm" or "MLME-SET-LINK.confirm" is False, the status reported fro= m 6top to higher layer must be False. But, there may be some other factors = also making the status False. Make sense? Qin On Fri, Aug 16, 2013 at 7:44 AM, > wrote: Hi Qin, Regarding to (2), this is my understanding from the procedure for creating = a hard cell and slotframe. Am I missing something from 6top? [cid:image001.jpg@01CE9BA7.C7888620] Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 12:32 AM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Raghuram and Pouria, The following is my understanding. (1) Taking the assumption in Raghuram's example, i.e. installing a route wi= th hard cells, then, some role like PCE should exist and take responsibilit= y to make conflict-free. In another word, the scenario described in the Rag= huram's example should not happen. (But, it doesn't mean a confirmation mes= sage is not needed, see the following) . (2) "MLME-SET-SLOTFRAME.confirm" and "MLME-SET-LINK.confirm" are primitive= s of 802.15.4e. The confirmation to upper layer should come from the execut= ion of 6top commands, which may related with the two 15.4e primitives, but = not exactly same. (3) RPL is a routing protocol. It uses the TSCH schedule to forward packets= , no matter the schedule is installed by PCE (hard cell) , or by some reser= vation protocol like RSVP (soft cell). Make sense? Thanks Qin On Fri, Aug 16, 2013 at 5:52 AM, > wrote: Hi Raghuram, Qin, Let me enter to your discussion I agree with Raghuram that when the higher layer call the 6top's commands (= or .requests primitives) it should be informed about the status of its requ= est by "command reply" or ".confirm" primitives. The status of the ".confir= m" or "reply" can be success, failure or ... Am I right? I couldn't either find the 6top's behavior upon receiving the "MLME-SET-SLO= TFRAME.confirm" or "MLME-SET-LINK.confirm" primitives that might be called = by L2. Did I miss that? Raghuram, I just have one minor comment, in your example. I think that the = RPL (L3) should use the "Create soft cell command" to ask a new cell withou= t specifying the exact cell. Because the L3 does not have enough informatio= n to ask for reserving specific cell in L2. The "Create hard cell command" = should be called by the one who has the global knowledge on network schedul= es, like PCE. However, I agree that the PCE by calling the "Create hard cel= l command" or RPL by calling "Create soft cell command" should be informed = by 6top about the status of its request. For example, It might happen that = PCE send a same request twice or RPL's request can't be serviced. AM I right? Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Raghuram Sudha= akar (rsudhaak) Sent: Thursday, August 15, 2013 9:07 PM To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA721D0EXMBX23adutwent_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Hi Qin,=

     <= /p>

    Many thanks for your clar= ification.

    Agreed,=

     <= /p>

    Pouria<= /p>

     <= /p>

    From: Qin Wang= [mailto:qinwang@berkeley.edu]
    Sent: Saturday, August 17, 2013 11:33 PM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Pouria,

     

    According to the new version of Charter, in the curr= ent step, we only consider the static case of building TSCH schedule. That = means the new node (node B) will use shared cells to send RPL control messa= ges like DAO to the existing node (node A). The set of shared cells will be advertised in EB by node A. And,= in the shared cells, node A should be awake for listening (at lease at the= beginning of timeslots) . So, even in the lack of signaling protocol and w= ithout installing a track, RPL should be able to work. Right?

     

    Then, if RPL or other upper layer wants more bandwid= th, some centralized/distributed reservation mechanism will be needed. That= will be addressed in the next step. What do you think?

     

    Qin

     

     

     

    On Sat, Aug 17, 2013 at 11:56 PM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

     

    I agree with starting a new threat and = discuss about the details of the control flows.

     

     

    Regarding to the interface between 6top= and higher layer (e.g. RPL), Let me explain my point with an example: Let’s consider a new joined device, node A, that needs s= ome cells to start sending its RPL control packets to its parent node B. Ho= w does node A, upon choosing a new parent (node B), can reserve cells (e.g.= for exchanging RPL control packets like DAO or DIO)? How does node B (or node B’ parent), who has just recei= ved node A’ DAO packet as its children, can reserve extra cells towar= d their parent. In the lack of signaling protocol and without installing a = track, is there any primitive that the RPL or 6top can use, to reserve some cells locally based on it DAO and DIO packet= rates with their parents?

    In order to handle this situation in 6t= op, don’t we need to import some information from the parent table and route table (in storing mode) from L3 to 6top? I mean how does a= RPL parent inform 6top about its children and descendants numbers and the = potential control messages rate (e.g. DAO) that it should forward toward th= e DODAG root? In addition how does the new device inform the 6top about its new parent? 

    You might say that DAO and DIO transmis= sion rate might changes overtime and reserving resources doesn’t make sense. But let’s consider RPL control packets just as an exampl= e.

    Am I missing anything? 

     

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Saturday, August 17, 2013 3:18 PM

     

    Pouira,

     

    I see your point. In the task item-1 "Timeslot Management met= hods and formats", control flows will be defined (See the record for t= eleconference on 8/9). We can address the issue you mentioned above in that document. Maybe we should start a thread to di= scuss what the control flows should be, what the message contents should be= .

     

    Regarding to the interface between 6top and RPL, my understanding = is RPL just use the TSCH schedule, instead of building the schedule by usin= g something like Soft cell creation. But, maybe, the status of TSCH schedule can be taken as a factor of RPL's = OF. What do you think?

     

    Qin

     

     

     

     

    On Fri, Aug 16, 2013 at 9:24 PM, <P.Zand@utwente.nl> wrote:

    Qin,

     

    I completely agree with you that the st= atus of the report/confirm form 6top to higher layer might be changed by other factors as well. My point is that, one of those factor= s, is the status of “.confirm” primitives received form L2. I t= hink in 6top, we have to add them to the list of the factors that effect on= the reply/confirm to higher layer. Am I right?  

     

    Regarding to (1), I think, when the 6to= p commands/primitives are called by higher layer (either by PCE, potential signaling protocol, or temporary by RPL in the lack of sign= aling protocol) we have to send a “.confirm” to inform them abo= ut the status of their requests. Am I right? I would say that in some cases= we might need to send the confirmation to PCE with the FAIL status.

     

    Regarding to (3), I agree that the sign= aling protocol and PCE should call the cell creation commands/primitives. Do you agree that 6top should be independent form the higher layer that ha= s called its primitives/command? Is there any limitation that in the lack o= f signaling protocol, the RPL can’t call some of the 6top’ mana= gement commands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

     

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM

     

    Hi Pouria,

     

    It is the process to create a hard cell and slotframe. You see,&nb= sp; “MLME-SET-SLOTFRAME.confirm”= ; and “MLME-SET-LINK.confirm” generates confirmation from L2, which = usually is one of factors to generate the confirmation message to higher la= yer. In another word, when the status returned by  “MLME-SE= T-SLOTFRAME.confirm” or “MLME-SET-LINK.confirm” is False,= the status reported from 6top to higher layer must be False. But, there may be= some other factors also making the status False.

     

    Make sense?

     

    Qin

     

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    Regarding to (2), this is my understand= ing from the procedure for creating a hard cell and slotframe. Am I missing something from 6top?

     

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak);     6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Raghuram and Pouria,

     

    The following is my understanding.

     

    (1) Taking the assumption in Raghuram's example, i.e. installing a= route with hard cells, then, some role like PCE should exist and take resp= onsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should not = happen. (But, it doesn't mean a confirmation message is not needed, see the= following) .

     

    (2)  “MLME-SET-SLOTFRAM= E.confirm” and “MLME-SET-LINK.confirm” are primitives of = 802.15.4e. The confirmation to upper layer should come from the execution of 6top commands, which may = related with the two 15.4e primitives, but not exactly same.

     

    (3) RPL is a routing protocol. It uses the TSCH schedule to forwar= d packets, no matter the schedule is installed by PCE (hard cell) , or by s= ome reservation protocol like RSVP (soft cell).

     

    Make sense?

     

    Thanks

    Qin

     

     

     

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Raghuram, Qin,

    Let me enter to your discussion<= o:p>

    I agree with Raghuram that when the hig= her layer call the 6top’s commands (or .requests primitives) it should be informed about the status of its request by “command re= ply” or “.confirm” primitives. The status of the “.= confirm” or “reply” can be success, failure or …

    Am I right?

    I couldn’t either find the 6top&#= 8217;s behavior upon receiving the “MLME-SET-SLOTFRAME.confirm”= or “MLME-SET-LINK.confirm” primitives that might be called by L2. Did I miss that?<= /p>

     

    Raghuram, I just have one minor comment= , in your example. I think that the RPL (L3) should use the “Create soft cell command” to ask a new cell without specifyin= g the exact cell. Because the L3 does not have enough information to ask fo= r reserving specific cell in L2. The “Create hard cell command”= should be called by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he “Create hard cell command” or RPL by calling “Create s= oft cell command” should be informed by 6top about the status of its = request. For example, It might happen that PCE send a same request twice or RPL’s request can’t be serviced. =

    AM I right?

     

    Pouria.     

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

     

    HI Qin,

    The conflicts I am referring to are -

     

    Consdiering multihop communication and hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68=
    2. But another route 2 requires node A to listen on slot 35. = ;

    There may be other such conflicts that we may need to= resolve.

     

    -raghuram

     

     

    Hi Raghuram,

     

    I totally agree to your approach to define the flow i= nformation to L3.

     

    Regarding to your question, can you explain more abou= t:

    (1) from nodeA to nodeB is one hop or multi-hop?

    (2) installing the route with hard cells or soft cell= s?

    (3) what "conflict during route installation&quo= t; mean? what kind of conflict?

     

    Thanks

    Qin

     

     

     

    On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar = (rsudhaak) <rsud= haak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of thought. I agree = with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain informatio= n from 6top. Obviously, 6top will expose these interfaces in its standard i= mplementation.

     

    Do you think finding the common requirements from 6to= p to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

     

    The different flows you have identified is perfect.&n= bsp;

    (1) The flows from 6top -> L2 have been addressed = quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements of PCE, RPL, (p= robably v6ND) in terms of parameters required for route computation to define the general requirements for flows between L3 and 6top. In the d= raft, you have already addressed some RPL specific primitives like control = message delivery. I think this should go in the RPL specific part. We defin= e primitives to expose parameters required by L3 to perform route computation in the general flows. For e.g.= L2 neighbor list, link quality to each neighbor. We need to specify the me= ssage format that needs to used by L3 to obtain this info.

    (3) We will also need 6top->L3 flows to be defined= . For e.g., in the RPL case,  GET_RPL_PARENT will be one such flow as 6top needs to provide the primitive GET_TIMING_PARENT = in the L2->6top flow. A similar primitive needs to be there for PCE.

     

    (Note: when I say L2 -> 6top flow, I mean L2 is th= e data requestor entity and 6top is the data provider. This is my own convention and hence the clarification)

     

    Another critical part I want to get your opinions on = is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

     

     

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

     

    Hi Raghuram,

     

    Sorry for the late response. It is welcome for you to= add flow information if necessary.

     

    Just one thing I want to understand more clearly. I t= hink 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct? 

     

    In this sense, we should separate the general flow in= formation to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

     

    (1) flow information with L2, i.e. TSCH

    (2) general flow information with upper layer, may be= L3 or L2.5

    (3) flow information with specific upper layer protoc= ol like RPL.

     

    What do you think?

     

    Qin 

     

     

     

     

     

     

     

     

     

     

     

     

    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (= rsudhaak) <rsudh= aak@cisco.com> wrote:

    Ok. 

     

    Qin, if you are OK I can add the flow information spe= cific to RPL. 

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

     

    Hi Raghuram,

    I let Qin answer as she is the main author. My opinio= n is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

     

    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (= rsudhaak) <rsudh= aak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some information that needs t= o be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin'= s draft. I wanted to check with you guys if you want to add to the same doc= ument or split it into a separate RFC. When I say split into separate RFC, =  what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information abou= t L2 to 6top. I could add more about the RPL to 6top is its OK..

     

    -raghuram

     

     

     

     

     

     

     

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mcr@sandelman.ca Sun Aug 18 15:14:22 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6F8DE11E8197; Sun, 18 Aug 2013 15:14:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.834 X-Spam-Level: X-Spam-Status: No, score=-1.834 tagged_above=-999 required=5 tests=[AWL=-0.765, BAYES_00=-2.599, DATE_IN_PAST_24_48=1.219, HOST_MISMATCH_NET=0.311] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5AZOBOHgzCEw; Sun, 18 Aug 2013 15:14:17 -0700 (PDT) Received: from relay.sandelman.ca (relay.cooperix.net [176.58.120.209]) by ietfa.amsl.com (Postfix) with ESMTP id DBBAA11E817D; Sun, 18 Aug 2013 15:14:16 -0700 (PDT) Received: from sandelman.ca (unknown [209.87.252.140]) by relay.sandelman.ca (Postfix) with ESMTPS id 8DE3022080; Sun, 18 Aug 2013 18:14:15 -0400 (EDT) Received: from sandelman.ca (quigon.sandelman.ca [127.0.0.1]) by sandelman.ca (Postfix) with ESMTP id 5F258CA0D7; Sat, 17 Aug 2013 16:30:19 -0400 (EDT) From: Michael Richardson To: 6TSCH <6tsch@ietf.org>, roll@ietf.org In-reply-to: References: Comments: In-reply-to Thomas Watteyne message dated "Thu, 01 Aug 2013 15:12:45 +0200." X-Mailer: MH-E 8.3; nmh 1.3; XEmacs 21.4 (patch 22) MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha1; protocol="application/pgp-signature" Date: Sat, 17 Aug 2013 16:30:19 -0400 Message-ID: <6445.1376771419@sandelman.ca> Sender: mcr@sandelman.ca Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , "Ted Lemon \(ted.lemon@nominum.com\)" Subject: [6tsch] should 6tsch adopt draft-ietf-roll-rpl-industrial-applicability? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Aug 2013 22:14:22 -0000 --=-=-= Content-Transfer-Encoding: quoted-printable This email is directed at IESG types, as this requires an IESG action. >>>>> "Thomas" =3D=3D Thomas Watteyne writes: Thomas> After discussion and suggestions from numerous 6TSCH and Thomas> other people here at the IETF, the chairs have created a Thomas> new, simplified version of the draft, which we have uploaded Thomas> in the repo at: Thomas> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/chart= er-ietf-6tsch-00.txt Foolishly, I didn't copy this to my laptop before leaving for the cottage, where I am now catching up on some mailing lists using DTN protocols, as no network, so I haven't read the above.=20 In the last version that I read the question of what, if anything, to do with draft-ietf-roll-rpl-industrial-applicability was unresolved. To recap, the options are: 1) nothing. Leave it in ROLL. It may progress as is, or it may reference si= xtus work non-norminatively. A second document (-bis) might reference sixtus normatively in the futur= e. 2) leave it in ROLL, have it reference sixtus work normatively, and have this document stalled until sixtus progresses. 3) move this document to sixtus, where I think it will get significantly more review and energy. There are perhaps other options, which I would like to add to a list, and then make a WG consensus call (in ROLL) about what feedback ROLL would like the IESG to hear. (You can perhaps see which one I prefer) =2D-=20 Michael Richardson =2Dat the cottage- --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEcBAABAgAGBQJSD91aAAoJEKD0KQ7Gj3P2pIUIAIEau+s++Yzg1D764xHDCytl skbpXVNRVuOaDscs71MekPuxoPgtNyzB+GsGtNvnZI8zGdhtD3SFaMr7vP/Pytp2 zeBWWbZchDx8iuN3EYAhLB08cw1vAcipjcaH15w1dahGWHci9kGjwpDZ7KCZ3dE8 fompHNmJMVf0TZPfeRSyxwe3IO2LfvNbm5J988qf4B3PAMvlHfxtVTPDykh4g5+n yj+tf7LziwfB65SVgE47LzOiQ0D7W/kgK1wz41rmDzuzlrTrhYQEn3Hhyp5qU58C 3yM+qsrAG29ZWXaVbfs1ISM3/3UgLAK4N/sNgzNkTyspRQAS9CwOzogkk/0ziak= =vaZy -----END PGP SIGNATURE----- --=-=-=-- From mcr@sandelman.ca Sun Aug 18 15:37:19 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 250D911E81CE; Sun, 18 Aug 2013 15:37:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.138 X-Spam-Level: X-Spam-Status: No, score=-2.138 tagged_above=-999 required=5 tests=[AWL=0.150, BAYES_00=-2.599, HOST_MISMATCH_NET=0.311] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IqdT9jaAJ0kA; Sun, 18 Aug 2013 15:37:14 -0700 (PDT) Received: from relay.sandelman.ca (relay.cooperix.net [176.58.120.209]) by ietfa.amsl.com (Postfix) with ESMTP id 088F511E81C6; Sun, 18 Aug 2013 15:37:14 -0700 (PDT) Received: from sandelman.ca (unknown [209.87.252.140]) by relay.sandelman.ca (Postfix) with ESMTPS id 2094C22077; Sun, 18 Aug 2013 18:37:13 -0400 (EDT) Received: from sandelman.ca (quigon.sandelman.ca [127.0.0.1]) by sandelman.ca (Postfix) with ESMTP id D7C15CA0C9; Sun, 18 Aug 2013 18:37:20 -0400 (EDT) From: Michael Richardson To: 6TSCH <6tsch@ietf.org>, roll@ietf.org In-reply-to: <6445.1376771419@sandelman.ca> References: <6445.1376771419@sandelman.ca> Comments: In-reply-to Michael Richardson message dated "Sat, 17 Aug 2013 16:30:19 -0400." X-Mailer: MH-E 8.3; nmh 1.3; XEmacs 21.4 (patch 22) MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha1; protocol="application/pgp-signature" Date: Sun, 18 Aug 2013 18:37:20 -0400 Message-ID: <6375.1376865440@sandelman.ca> Sender: mcr@sandelman.ca Cc: "Adrian Farrel \(adrian@olddog.co.uk\)" , "Ted Lemon \(ted.lemon@nominum.com\)" , draft-ietf-roll-rpl-industrial-applicability@tools.ietf.org Subject: Re: [6tsch] should 6tsch adopt draft-ietf-roll-rpl-industrial-applicability? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Aug 2013 22:37:19 -0000 --=-=-= Content-Transfer-Encoding: quoted-printable please see inline. >>>>> "mcr" =3D=3D Michael Richardson writes: Thomas> in the repo at: Thomas> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/chart= er-ietf-6tsch-00.txt mcr> Foolishly, I didn't copy this to my laptop before leaving for mcr> the cottage, where I am now catching up on some mailing lists mcr> using DTN protocols, as no network, so I haven't read the mcr> above. I have re-read this final version. Applicability statements are not included in the current charter, nor is it clear to me if the industrial uses envisioned by the ROLL industrial applicability statement knows if it needs static of dynamic=20 schedules. mcr> In the last version that I read the question of what, if mcr> anything, to do with mcr> draft-ietf-roll-rpl-industrial-applicability was unresolved. mcr> To recap, the options are: mcr> 1) nothing. Leave it in ROLL. It may progress as is, or it may mcr> reference sixtus work non-norminatively. A second document mcr> (-bis) might reference sixtus normatively in the future. mcr> 2) leave it in ROLL, have it reference sixtus work normatively, mcr> and have this document stalled until sixtus progresses. mcr> 3) move this document to sixtus, where I think it will get mcr> significantly more review and energy. mcr> There are perhaps other options, which I would like to add to a I am now of the opinion that proceeding with (1), as things are, might be the best way forward for now, but that a -bis document in some group would be appropriate.=20=20 My message to IESG-types is that the industrial applicability statement-bis is required. My uncertainty is that I don't not know if the non-bis applicability statement will have any practical use in industry at all. It might not be worth the 16-bits to store the RFC#. I look to those better connected to that industry to say. =2D-=20 Michael Richardson =2Dat the cottage- --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEcBAABAgAGBQJSEUygAAoJEKD0KQ7Gj3P2Q2gH/j+1izRaqnFHA71BlqJAgfMX RBQaahLA9brKC+dNhusVZZqXvnlNRrKslWMXBDcZIh0/Hvd+BKye1hovfCNAZcdL xgH3kK+ZMn3aOQOCxWK6nyfTqzEgJrirMVL4Bvdfyf3FBMJkAlBhS8nX1Uz3v73r U/3ym7ldLKrVQ5m8mmfJWnRUS3Se1g0JXX19W+Z3h+/3NuqAlwcPlBCvNBBBX1ZI fP1v98gUI1zgWDedI+43xXKG8l9WQksCAQ4Z6Fi/D3TugV0v2UtGZbPnELVocJ0Z 3JO1ApMje+wSVtSJYXHGTjgkfk7/Vdf4F1xO/4WBZ6OX4qgTxi1FofJ/l/X+mZE= =1/vC -----END PGP SIGNATURE----- --=-=-=-- From twatteyne@gmail.com Sun Aug 18 19:28:23 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2975C11E8199 for <6tsch@ietfa.amsl.com>; Sun, 18 Aug 2013 19:28:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.838 X-Spam-Level: X-Spam-Status: No, score=-1.838 tagged_above=-999 required=5 tests=[AWL=0.139, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L6UfJxL4U1Hl for <6tsch@ietfa.amsl.com>; Sun, 18 Aug 2013 19:28:21 -0700 (PDT) Received: from mail-pa0-x22d.google.com (mail-pa0-x22d.google.com [IPv6:2607:f8b0:400e:c03::22d]) by ietfa.amsl.com (Postfix) with ESMTP id 3DB6411E811D for <6tsch@ietf.org>; Sun, 18 Aug 2013 19:28:21 -0700 (PDT) Received: by mail-pa0-f45.google.com with SMTP id bg4so1148040pad.32 for <6tsch@ietf.org>; Sun, 18 Aug 2013 19:28:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=XG+fGb856e1E/P3thNkTdl1SGor0aH0JmF7IXvfVi0k=; b=BURfa6XuAoCIpMx95ZPY/CjZXJ/1EaKtkdmwwtW7HQI7FYpwOujhL5O8z5kSsWNC3I QBuF6BGlObu8exE5ngNsTv/iQ39A1g07j9XIRAuU7gSo7OvZrvqDnuc7buvivlaT91vj mb/wx7yYK26oC+xcPNn1nOvmKe7/LP5AJWklYOkRU1CBN3X3gGLhEx0Ht0gDEy2T8i5e AZOlCmEJOWyAtdf2fjchrRSrLuT7u1R1EIr0K7+XiWuMYHrR7lDCgL7VpD9FRuaNw6PL 53bwlAXU+EZrZPV7/PI9Bh4z7ajYEa0Q0wzPjV/mI9tZ47cgfYUKN8ST8DTMIAUMEXlz /HoQ== X-Received: by 10.68.232.166 with SMTP id tp6mr299773pbc.153.1376879300882; Sun, 18 Aug 2013 19:28:20 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Sun, 18 Aug 2013 19:28:00 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> From: Thomas Watteyne Date: Sun, 18 Aug 2013 19:28:00 -0700 X-Google-Sender-Auth: WSht6yJftdb2DEqdT12IQ8uFOLQ Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b33d590a0b8e304e443b1c4 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 02:28:23 -0000 --047d7b33d590a0b8e304e443b1c4 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Pouria, all, My 2c is the following. We already agreed on the fact that a mote's (RPL) routing parent would also be its (TSCH) time source neighbor. So why not pick the time source neighbor based on routing information? What exactly do you mean by clock accuracy? All nodes in a TSCH network need to be able to synchronize with one another, and I don't think we are considering cases where that is not true. Thomas On Thu, Aug 15, 2013 at 3:07 PM, wrote: > Raghuram,**** > > I agree with you that we need a method to pick a timing parent.**** > > We might need the L3 information on that, unless we can find a solution i= n > 6top to use L2 information. For example about the clock accuracy > capabilities of the device who has already joined the network. I am not > sure if this information is available in L2 and neighbor table.**** > > Best Wishes,**** > > Pouria**** > > ** ** > > *From:* Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] > *Sent:* Wednesday, August 14, 2013 12:57 AM > *To:* xvilajosana@eecs.berkeley.edu; Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org; Qin Wang > > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Xavi, Pouria,**** > > I think we need to keep node rank at 6top (as a read only parameter > obtained from L3) in order for the TSCH nodes to figure out the timing > parent. In the case where RPL node may have different ranks based on > different OFs we need a method to pick a timing parent.**** > > ** ** > > We should propose a default OF, that is used to compute the ranks for the > purpose finding the timing parent.**** > > ** ** > > -raghuram**** > > ** ** > > *From: *Xavier Vilajosana Guillen > *Reply-To: * > *Date: *Tuesday, August 13, 2013 2:27 PM > *To: *Pouria Zand > *Cc: *Thomas Watteyne , "6tsch@ietf.org" < > 6tsch@ietf.org>, Qin Wang > *Subject: *Re: [6tsch] RPL on Basic**** > > ** ** > > Good point :-)**** > > agreed! > X**** > > ** ** > > On Tue, Aug 13, 2013 at 2:20 PM, wrote:**** > > Xavi,**** > > **** > > I guess we cannot keep =93node rank=94 in the 6top. Because a node might = have > different rank based on different metrics defined in L3. As a response, I > don=92t think we can get all of those information form L3 and use them in > neighbor table in 6top. Am I right? **** > > I think, as you mentioned we need to work on them. **** > > **** > > Pouria **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 11:13 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria, > > yes the neighbor table is something that 6top takes care of. The fields o= f > the table is something that we need to work on, stats for sure as describ= ed > by the basic configuration draft. As regards to the rank, in our > implementation, we keep it in the table, for each neighbour we keep its > rank. This information can be placed somewhere else if you want but I gue= ss > we need it to keep some sense on what is the rank of our neighbors.**** > > regards,**** > > Xavi**** > > **** > > **** > > On Tue, Aug 13, 2013 at 2:05 PM, wrote:**** > > Xavi,**** > > **** > > Many thanks for your complete explanation. It absolutely makes sense.**** > > **** > > Just one minor question. The neighbor table will be stored in 6top. Am I > right? If yes, do we need to store rank information (included in DIO) in > that table? Or we just store neighbor statistic?**** > > **** > > Pouria **** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 10:17 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > answer inline:**** > > Xavi,**** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > there are many different ways to implement that, this is an option.**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI?**** > > These are the list of known neighbors with acceptable RSSI, so yes if it > wants to keep all of them.**** > > Or (2) the node should probe its connection with the its RPL parent and > its RPL child? In the case (2), how does the 6top can inform the L3 about > the new potential discovered neighbors and their connection status? **** > > When a node is discovered due to receiving and EB (at least in our openws= n > implementation), it is inserted at the neighbor table. At that point no > information about connectivity can be used except RSSI. As soon as a DIO = is > received from that node, its information is updated (including rank). As = we > don't have any information about connectivity (as RFC6552 describes) an > initial value is set (i.e rank + FOO). In openwsn a similar case to (1) i= s > used so eventually some stats of the link can be used to compute the ETX > and let RPL do its work. **** > > So RPL knows about a new node because 6TOP keeps information of neighbors > an eventually this information is used by RPL to update routes. As this > node sends DIOs and receives DIOs from others the information is > permanently being updated enabling a node to be positioned in the multiho= p > topology.**** > > Does it make sense?**** > > Pouria**** > > **** > > On Tue, Aug 13, 2013 at 12:40 PM, wrote:**** > > Xavi,**** > > **** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > **** > > Pouria**** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > **** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:*6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > ** ** > --047d7b33d590a0b8e304e443b1c4 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Pouria, all,

    My 2c is the following. We= already agreed on the fact that a mote's (RPL) routing parent would al= so be its (TSCH) time source neighbor. So why not pick the time source neig= hbor based on routing information?

    What exactly do you mean by clock accuracy? All nodes i= n a TSCH network need to be able to synchronize with one another, and I don= 't think we are considering cases where that is not true.

    Thomas


    On Thu, Aug 15, 2013 at 3:07 PM, <= ;P.Zand@utwente.nl> wrote:

    Raghuram,

    I agree with you that we need a method = to pick a timing parent.

    We might need the L3 information on tha= t, unless we can find a solution in 6top to use L2 information. For example= about the clock accuracy capabilities of the device who has already joined the network. I am not sure if this informati= on is available in L2 and neighbor table.

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Raghuram= Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Xavi, Pouria,

    I think we need to keep node rank at 6t= op (as a read only parameter obtained from L3) in order for the TSCH nodes = to figure out the timing parent. In the case where RPL node may have different ranks based on different OFs we need a m= ethod to pick a timing parent.

    =A0

    We should propose a default OF, that is= used to compute the ranks for the purpose finding the timing parent.

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wa= ng <qinwang@be= rkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Good poi= nt :-)

    agreed!
    X

    = =A0

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl&= gt; wrote:

    Xavi,<= u>

    =A0=

    I guess we cannot keep = =93node rank=94 in the 6top. Because a node might have different rank based= on different metrics defined in L3. As a response, I don=92t think we can get= all of those information form L3 and use them in neighbor table in 6top. A= m I right?

    I think, as you mentioned= we need to work on them.

    =A0=

    Pouria =A0

    =A0=

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM    =


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria= ,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

    =A0

    =A0

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl&g= t; wrote:

    Xavi,<= u>

    =A0=

    Many thanks for your comp= lete explanation. It absolutely makes sense.

    =A0=

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

    =A0=

    Pouria

    =A0=

    =A0=

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM    =


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria= ,

    answer in= line:

    Xavi,

    Keep Alive timer expires for =93node A=94 aft= er 30s if no frames have been sent (or received) to (or from) neighbor =93n= ode B=94. Am I right?

    there are many different ways to implement that, this is an= option.

    =A0<= /p>

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.<= /span>

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status? <= /span>

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its = information is updated (including rank). As we don't have any informati= on about connectivity (as RFC6552 describes) an initial value is set (i.e r= ank + FOO). In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute= the ETX and let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node t= o be positioned in the multihop topology.=

    Does it make sense?

    Pouria

    =A0

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl&= gt; wrote:

    Xavi,<= u>

    =A0=

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or from) neighbor =93node B=94. Am I right?<= /span>

    =A0=

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status? =A0=A0=A0

    =A0=

    Pouria=

    =A0=

    =A0=

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria= ,

    I completely agree with your description= . Besides, there isn't a common shared cell to send KAs. I see the oper= ation in the following way:

    6top KA t= imer expires and places a KA packet into the queue (e.g this happens every = 30s). TSCH layer at the begining of a shared tx/rx slot then reads from the queue and sends the packet. This means that the KA can be send in any shar= ed slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl&g= t; wrote:

    Dear Qin, All,

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0=

    Best wishes,

    Pouria=

    =A0=

    From:6tsch-bounces@ietf.org= [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,=

    =A0

    I remember keep-alive usually use dedica= ted cell, instead of shared cell, e.g. a Rx cell in child, and a Tx cell in= parent. But, with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive ha= s to use shared cell, which may result in more collision and then traffic.<= u>

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas = Watteyne <watteyne@eecs.berkeley.edu> wrote:

    We established a while ago that we could= reuse the RPL DAG structure for timekeeping. That is, a node's routing= parent coincides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) = to the parent. How often depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will= realize its routing parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for N= UD, at least n the child->parent case. Of course, this alone does no cov= er parent->child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent c= ase?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal= Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

    =A0=

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0=

    Cheers,

    =A0=

    Pascal=

    =A0=

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal= ,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)<= /u>

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal= Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

    =A0

    =A0

    Please see in= line

    =A0=

    -RPL objective function = calculation using Neighbors information described in Basic configuration.

    =A0=A0=A0 -this includes= how OF is calculated using numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing m= ode vs non-storing mode (I vote for non-storing mode for a basic configurat= ion)

    =A0=

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0=

    =A0=A0=A0=A0 - DIO period. Whether we us= e trickle algorithm (and we define the initial period) or we use a fix peri= od for DIO (no trickle) for basic configuration.

    =A0=A0=A0= =A0=A0 -DAO period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly = ask for opinions and contribution to this items so we can start narrowing t= he content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0

    =A0


    --047d7b33d590a0b8e304e443b1c4-- From adrian@olddog.co.uk Mon Aug 19 04:46:34 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A30F11E8259; Mon, 19 Aug 2013 04:46:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bLrqRFm8p4dU; Mon, 19 Aug 2013 04:46:29 -0700 (PDT) Received: from asmtp2.iomartmail.com (asmtp2.iomartmail.com [62.128.201.249]) by ietfa.amsl.com (Postfix) with ESMTP id 3C14711E8262; Mon, 19 Aug 2013 04:45:25 -0700 (PDT) Received: from asmtp2.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp2.iomartmail.com (8.13.8/8.13.8) with ESMTP id r7JBjNvj011484; Mon, 19 Aug 2013 12:45:23 +0100 Received: from 950129200 (dsl-sp-81-140-15-32.in-addr.broadbandscope.com [81.140.15.32]) (authenticated bits=0) by asmtp2.iomartmail.com (8.13.8/8.13.8) with ESMTP id r7JBjLRL011474 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NO); Mon, 19 Aug 2013 12:45:22 +0100 From: "Adrian Farrel" To: "'Michael Richardson'" , "'6TSCH'" <6tsch@ietf.org>, References: <6445.1376771419@sandelman.ca> <6375.1376865440@sandelman.ca> In-Reply-To: <6375.1376865440@sandelman.ca> Date: Mon, 19 Aug 2013 12:45:21 +0100 Message-ID: <051e01ce9cd1$96b957b0$c42c0710$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQEkTJGQvd+bjso7JL5G/qAvgS0NEgGp8MGdAgyt/LSa01RrcA== Content-Language: en-gb Cc: draft-ietf-roll-rpl-industrial-applicability@tools.ietf.org, 'Ted Lemon' Subject: Re: [6tsch] should 6tsch adopt draft-ietf-roll-rpl-industrial-applicability? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: adrian@olddog.co.uk List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 11:46:34 -0000 Hi Michael, Thanks for thinking about this. I believe I read the bottom line as "Steady as she goes," but with the intention of looking back at this from time to time. And yes, Ted, should sixtus also have a milestone for some form of applicability statement? Cheers, Adrian > >>>>> "mcr" == Michael Richardson writes: > Thomas> in the repo at: > Thomas> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/master/charter- > ietf-6tsch-00.txt > > mcr> Foolishly, I didn't copy this to my laptop before leaving for > mcr> the cottage, where I am now catching up on some mailing lists > mcr> using DTN protocols, as no network, so I haven't read the > mcr> above. > > I have re-read this final version. > > Applicability statements are not included in the current charter, nor is > it clear to me if the industrial uses envisioned by the ROLL > industrial applicability statement knows if it needs static of dynamic > schedules. > > mcr> In the last version that I read the question of what, if > mcr> anything, to do with > mcr> draft-ietf-roll-rpl-industrial-applicability was unresolved. > > mcr> To recap, the options are: > > mcr> 1) nothing. Leave it in ROLL. It may progress as is, or it may > mcr> reference sixtus work non-norminatively. A second document > mcr> (-bis) might reference sixtus normatively in the future. > > mcr> 2) leave it in ROLL, have it reference sixtus work normatively, > mcr> and have this document stalled until sixtus progresses. > > mcr> 3) move this document to sixtus, where I think it will get > mcr> significantly more review and energy. > > mcr> There are perhaps other options, which I would like to add to a > > I am now of the opinion that proceeding with (1), as things are, might > be the best way forward for now, but that a -bis document in some group > would be appropriate. > > My message to IESG-types is that the industrial applicability > statement-bis is required. > > My uncertainty is that I don't not know if the non-bis applicability > statement will have any practical use in industry at all. It might not > be worth the 16-bits to store the RFC#. I look to those better > connected to that industry to say. From Ted.Lemon@nominum.com Mon Aug 19 05:17:41 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 619B921F8A53; Mon, 19 Aug 2013 05:17:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -106.583 X-Spam-Level: X-Spam-Status: No, score=-106.583 tagged_above=-999 required=5 tests=[AWL=0.016, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E-rD4u7SCjK8; Mon, 19 Aug 2013 05:17:34 -0700 (PDT) Received: from exprod7og120.obsmtp.com (exprod7og120.obsmtp.com [64.18.2.18]) by ietfa.amsl.com (Postfix) with ESMTP id F101111E8249; Mon, 19 Aug 2013 05:17:29 -0700 (PDT) Received: from shell-too.nominum.com ([64.89.228.229]) (using TLSv1) by exprod7ob120.postini.com ([64.18.6.12]) with SMTP ID DSNKUhIM2LeP9aPknZWwIK8d/SrhvPahD8XP@postini.com; Mon, 19 Aug 2013 05:17:30 PDT Received: from archivist.nominum.com (archivist.nominum.com [64.89.228.108]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "*.nominum.com", Issuer "Go Daddy Secure Certification Authority" (verified OK)) by shell-too.nominum.com (Postfix) with ESMTP id 9B0D41B82A4; Mon, 19 Aug 2013 05:17:28 -0700 (PDT) Received: from webmail.nominum.com (cas-01.win.nominum.com [64.89.228.131]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "mail.nominum.com", Issuer "Go Daddy Secure Certification Authority" (verified OK)) by archivist.nominum.com (Postfix) with ESMTPS id 7FDEA19005D; Mon, 19 Aug 2013 05:17:28 -0700 (PDT) (envelope-from Ted.Lemon@nominum.com) Received: from MBX-01.WIN.NOMINUM.COM ([64.89.228.133]) by CAS-01.WIN.NOMINUM.COM ([64.89.228.131]) with mapi id 14.02.0318.004; Mon, 19 Aug 2013 05:17:28 -0700 From: Ted Lemon To: "" Thread-Topic: should 6tsch adopt draft-ietf-roll-rpl-industrial-applicability? Thread-Index: AQHOnGBIrGzAzibxMU2BJZZdbbC4BpmcA5cAgADcLICAAAj6gA== Date: Mon, 19 Aug 2013 12:17:27 +0000 Message-ID: <8D23D4052ABE7A4490E77B1A012B63077525B36E@mbx-01.win.nominum.com> References: <6445.1376771419@sandelman.ca> <6375.1376865440@sandelman.ca> <051e01ce9cd1$96b957b0$c42c0710$@olddog.co.uk> In-Reply-To: <051e01ce9cd1$96b957b0$c42c0710$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.1.10] Content-Type: text/plain; charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: Michael Richardson , 6TSCH <6tsch@ietf.org>, "" , "" Subject: Re: [6tsch] should 6tsch adopt draft-ietf-roll-rpl-industrial-applicability? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 12:17:41 -0000 On Aug 19, 2013, at 7:45 AM, Adrian Farrel wrote: > And yes, Ted, should sixtus also have a milestone for some form of applic= ability > statement? Do you mean in the form of a draft? From adrian@olddog.co.uk Mon Aug 19 05:23:11 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 12B8911E8105; Mon, 19 Aug 2013 05:23:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Q7X7k-e22PsZ; Mon, 19 Aug 2013 05:23:05 -0700 (PDT) Received: from asmtp3.iomartmail.com (asmtp3.iomartmail.com [62.128.201.159]) by ietfa.amsl.com (Postfix) with ESMTP id DCDDF11E80DE; Mon, 19 Aug 2013 05:23:04 -0700 (PDT) Received: from asmtp3.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id r7JCMumD012153; Mon, 19 Aug 2013 13:22:56 +0100 Received: from 950129200 (dsl-sp-81-140-15-32.in-addr.broadbandscope.com [81.140.15.32]) (authenticated bits=0) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id r7JCMqvH012119 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NO); Mon, 19 Aug 2013 13:22:55 +0100 From: "Adrian Farrel" To: "'Ted Lemon'" References: <6445.1376771419@sandelman.ca> <6375.1376865440@sandelman.ca> <051e01ce9cd1$96b957b0$c42c0710$@olddog.co.uk> <8D23D4052ABE7A4490E77B1A012B63077525B36E@mbx-01.win.nominum.com> In-Reply-To: <8D23D4052ABE7A4490E77B1A012B63077525B36E@mbx-01.win.nominum.com> Date: Mon, 19 Aug 2013 13:22:52 +0100 Message-ID: <052a01ce9cd6$d5b92c60$812b8520$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQEkTJGQvd+bjso7JL5G/qAvgS0NEgGp8MGdAgyt/LQBehEmWAMEw6eOmq9njEA= Content-Language: en-gb Cc: 'Michael Richardson' , '6TSCH' <6tsch@ietf.org>, roll@ietf.org, draft-ietf-roll-rpl-industrial-applicability@tools.ietf.org Subject: Re: [6tsch] should 6tsch adopt draft-ietf-roll-rpl-industrial-applicability? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: adrian@olddog.co.uk List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 12:23:11 -0000 Yup (with the intention of publication as an RFC :-) > -----Original Message----- > From: Ted Lemon [mailto:Ted.Lemon@nominum.com] > Sent: 19 August 2013 13:17 > To: > Cc: Michael Richardson; 6TSCH; ; applicability@tools.ietf.org> > Subject: Re: should 6tsch adopt draft-ietf-roll-rpl-industrial-applicability? > > On Aug 19, 2013, at 7:45 AM, Adrian Farrel wrote: > > And yes, Ted, should sixtus also have a milestone for some form of applicability > > statement? > > Do you mean in the form of a draft? From twatteyne@gmail.com Mon Aug 19 08:32:59 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B60D911E8102 for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 08:32:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.858 X-Spam-Level: X-Spam-Status: No, score=-1.858 tagged_above=-999 required=5 tests=[AWL=0.119, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FysgCOiau8Cd for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 08:32:57 -0700 (PDT) Received: from mail-pb0-x236.google.com (mail-pb0-x236.google.com [IPv6:2607:f8b0:400e:c01::236]) by ietfa.amsl.com (Postfix) with ESMTP id 4AE1E11E8109 for <6tsch@ietf.org>; Mon, 19 Aug 2013 08:32:57 -0700 (PDT) Received: by mail-pb0-f54.google.com with SMTP id ro12so5096295pbb.13 for <6tsch@ietf.org>; Mon, 19 Aug 2013 08:32:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=HiDEpYJKQcupbeIP9hj+eEL0pD0Mx9Rd26w53aT0GYc=; b=pT2SYNIZhhDhOPgmrmJ2A47PJNnQM6DLdUP4IaeLMZmJ4oLdG1mr+t9go2yUdorLo0 DapLsudprzwWGb3rxs1da1FtxQeWNPPqfurjfVIShpkhXWtMEtEu8/p4IrGbDiL8HWk9 UK9cyj0F6Dd+c34+Qo7OQ8Mi/s43jyTQTDh08V45VHbNQOzW0nY5c4+/4gz/B578fCPz n752SdsHJJfmMzC3fw+a0DauTEE30mUXe3CvNGC8dfi26yx240Q/b1c4yVman5YAlpaB 8sYYOWa3ryk4M+UJ+zQJK8k8RoZnOvUrdS/jSxRa6X+DTJSyMnqm90rCg4MS2nvXSgDJ 0qAg== X-Received: by 10.68.139.201 with SMTP id ra9mr13903396pbb.46.1376926376969; Mon, 19 Aug 2013 08:32:56 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Mon, 19 Aug 2013 08:32:36 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA721D0@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0A@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA721D0@EXMBX23.ad.utwente.nl> From: Thomas Watteyne Date: Mon, 19 Aug 2013 08:32:36 -0700 X-Google-Sender-Auth: lDOYcEZoUeLA0pmzCK66DT8toyY Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/related; boundary=001a11c3f4a094d29a04e44ea72d Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 15:32:59 -0000 --001a11c3f4a094d29a04e44ea72d Content-Type: multipart/alternative; boundary=001a11c3f4a094d29704e44ea72c --001a11c3f4a094d29704e44ea72c Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Qin, all, I agree with you analysis; I believe it is important that we first start with the simplest case, i..e a static schedule of shared slots. At the end this charter, we will have clearly identified how a full network operates in that case, and we then can start thinking about using a centralized/distributed scheduling mechanism. By then, we will have defined how to represent slots and cells in a non-verbose way (we started thinking about using BSON) as well as statistics and commands. Ideally, we want that format to be usable in the centralized and distributed scheduling case, so although we are not talking about this in the scope of this charter, we need to be aware how these formats will be used, and we therefore need to identify the flows. Coming back to Raghuram's case, I would argue that the cleanest approach for reserving cells is to have the upper layer explicitly reserve either soft or hard cells. This does not prevent a hybrid case, where one could imagine reserving a piece of the schedule for hard, another for soft cells. I believe it is, however, cleaner than having 6top ask about L3 and somehow know what to do depending on the L3 being used. I believe there are two immediate next steps: - in light of this discussion, identifying what's missing from the basic draft. Do you see anything obvious? - continue the work on BSON. Before delving into the representation of the information, I would first identify what the contents of the different signaling packets are, which can easily be done in e.g. JSON. Does this make sense? If we have a rough agreement, I propose we work on this and come up with a couple of slides for both items, to be discussed on Friday. Thomas On Sat, Aug 17, 2013 at 3:13 PM, wrote: > Hi Qin,**** > > ** ** > > Many thanks for your clarification.**** > > Agreed,**** > > ** ** > > Pouria**** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Saturday, August 17, 2013 11:33 PM > > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > ** ** > > Hi Pouria,**** > > ** ** > > According to the new version of Charter, in the current step, we only > consider the static case of building TSCH schedule. That means the new no= de > (node B) will use shared cells to send RPL control messages like DAO to t= he > existing node (node A). The set of shared cells will be advertised in EB = by > node A. And, in the shared cells, node A should be awake for listening (a= t > lease at the beginning of timeslots) . So, even in the lack of signaling > protocol and without installing a track, RPL should be able to work. Righ= t? > **** > > ** ** > > Then, if RPL or other upper layer wants more bandwidth, some > centralized/distributed reservation mechanism will be needed. That will b= e > addressed in the next step. What do you think?**** > > ** ** > > Qin**** > > ** ** > > ** ** > > ** ** > > On Sat, Aug 17, 2013 at 11:56 PM, wrote:**** > > Hi Qin,**** > > **** > > I agree with starting a new threat and discuss about the details of the > control flows.**** > > **** > > **** > > Regarding to the interface between 6top and higher layer (e.g. RPL), Let > me explain my point with an example: Let=92s consider a new joined device= , > node A, that needs some cells to start sending its RPL control packets to > its parent node B. How does node A, upon choosing a new parent (node B), > can reserve cells (e.g. for exchanging RPL control packets like DAO or > DIO)? How does node B (or node B=92 parent), who has just received node A= =92 > DAO packet as its children, can reserve extra cells toward their parent. = In > the lack of signaling protocol and without installing a track, is there a= ny > primitive that the RPL or 6top can use, to reserve some cells locally bas= ed > on it DAO and DIO packet rates with their parents? **** > > In order to handle this situation in 6top, don=92t we need to import some > information from the parent table and route table (in storing mode) from = L3 > to 6top? I mean how does a RPL parent inform 6top about its children and > descendants numbers and the potential control messages rate (e.g. DAO) th= at > it should forward toward the DODAG root? In addition how does the new > device inform the 6top about its new parent? **** > > You might say that DAO and DIO transmission rate might changes overtime > and reserving resources doesn=92t make sense. But let=92s consider RPL co= ntrol > packets just as an example.**** > > Am I missing anything? **** > > **** > > Pouria**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Saturday, August 17, 2013 3:18 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > **** > > Pouira,**** > > **** > > I see your point. In the task item-1 "Timeslot Management methods and > formats", control flows will be defined (See the record for teleconferenc= e > on 8/9). We can address the issue you mentioned above in that document. > Maybe we should start a thread to discuss what the control flows should b= e, > what the message contents should be.**** > > **** > > Regarding to the interface between 6top and RPL, my understanding is RPL > just use the TSCH schedule, instead of building the schedule by using > something like Soft cell creation. But, maybe, the status of TSCH schedul= e > can be taken as a factor of RPL's OF. What do you think?**** > > **** > > Qin**** > > **** > > **** > > **** > > **** > > On Fri, Aug 16, 2013 at 9:24 PM, wrote:**** > > Qin,**** > > **** > > I completely agree with you that the status of the report/confirm form > 6top to higher layer might be changed by other factors as well. My point = is > that, one of those factors, is the status of =93.confirm=94 primitives re= ceived > form L2. I think in 6top, we have to add them to the list of the factors > that effect on the reply/confirm to higher layer. Am I right? **** > > **** > > Regarding to (1), I think, when the 6top commands/primitives are called b= y > higher layer (either by PCE, potential signaling protocol, or temporary b= y > RPL in the lack of signaling protocol) we have to send a =93.confirm=94 t= o > inform them about the status of their requests. Am I right? I would say > that in some cases we might need to send the confirmation to PCE with the > FAIL status.**** > > **** > > Regarding to (3), I agree that the signaling protocol and PCE should call > the cell creation commands/primitives. Do you agree that 6top should be > independent form the higher layer that has called its primitives/command? > Is there any limitation that in the lack of signaling protocol, the RPL > can=92t call some of the 6top=92 management commands/primitives (e.g. *So= ft > cell creation*)? In this case, we might need to reply to RPL, by SUCCESS > or FAIL status? Did I miss anything?**** > > **** > > Pouria**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Friday, August 16, 2013 2:05 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > **** > > Hi Pouria,**** > > **** > > It is the process to create a hard cell and slotframe. You see, =93MLME-= SET-SLOTFRAME.confirm=94 > and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usu= ally > is one of factors to generate the confirmation message to higher layer. I= n > another word, when the status returned by =93MLME-SET-SLOTFRAME.confirm= =94 or > =93MLME-SET-LINK.confirm=94 is False, the status reported from 6top to hi= gher > layer must be False. But, there may be some other factors also making the > status False.**** > > **** > > Make sense?**** > > **** > > Qin**** > > **** > > On Fri, Aug 16, 2013 at 7:44 AM, wrote:**** > > Hi Qin,**** > > Regarding to (2), this is my understanding from the procedure for creatin= g > a hard cell and slotframe. Am I missing something from 6top?**** > > **** > > **** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Friday, August 16, 2013 12:32 AM > *To:* Zand, P. (EWI) > *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org > *Subject:* Re: Message flows**** > > **** > > Hi Raghuram and Pouria,**** > > **** > > The following is my understanding.**** > > **** > > (1) Taking the assumption in Raghuram's example, i.e. installing a route > with hard cells, then, some role like PCE should exist and take > responsibility to make conflict-free. In another word, the scenario > described in the Raghuram's example should not happen. (But, it doesn't > mean a confirmation message is not needed, see the following) .**** > > **** > > (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are > primitives of 802.15.4e. The confirmation to upper layer should come from > the execution of 6top commands, which may related with the two 15.4e > primitives, but not exactly same.**** > > **** > > (3) RPL is a routing protocol. It uses the TSCH schedule to forward > packets, no matter the schedule is installed by PCE (hard cell) , or by > some reservation protocol like RSVP (soft cell).**** > > **** > > Make sense?**** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > **** > > On Fri, Aug 16, 2013 at 5:52 AM, wrote:**** > > Hi Raghuram, Qin,**** > > Let me enter to your discussion**** > > I agree with Raghuram that when the higher layer call the 6top=92s comman= ds > (or .requests primitives) it should be informed about the status of its > request by =93command reply=94 or =93.confirm=94 primitives. The status o= f the > =93.confirm=94 or =93reply=94 can be success, failure or =85**** > > Am I right?**** > > I couldn=92t either find the 6top=92s behavior upon receiving the > =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitive= s that > might be called by L2. Did I miss that?**** > > **** > > Raghuram, I just have one minor comment, in your example. I think that th= e > RPL (L3) should use the =93Create soft cell command=94 to ask a new cell > without specifying the exact cell. Because the L3 does not have enough > information to ask for reserving specific cell in L2. The =93Create hard = cell > command=94 should be called by the one who has the global knowledge on > network schedules, like PCE. However, I agree that the PCE by calling the > =93Create hard cell command=94 or RPL by calling =93Create soft cell comm= and=94 > should be informed by 6top about the status of its request. For example, = It > might happen that PCE send a same request twice or RPL=92s request can=92= t be > serviced. **** > > AM I right?**** > > **** > > Pouria. **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Raghuram Sudhaakar (rsudhaak) > *Sent:* Thursday, August 15, 2013 9:07 PM > *To:* Qin Wang > *Cc:* 6tsch@ietf.org > *Subject:* Re: [6tsch] Message flows**** > > **** > > HI Qin,**** > > The conflicts I am referring to are -**** > > **** > > Consdiering multihop communication and hard-cells**** > > 1. Route 1 requires a particular set of slots to be setup. Say node A > must listen on slot number 11, 34, 65 and Tx on 13, 35, 68**** > 2. But another route 2 requires node A to listen on slot 35. **** > > There may be other such conflicts that we may need to resolve.**** > > **** > > -raghuram**** > > **** > > **** > > Hi Raghuram, **** > > **** > > I totally agree to your approach to define the flow information to L3.***= * > > **** > > Regarding to your question, can you explain more about:**** > > (1) from nodeA to nodeB is one hop or multi-hop?**** > > (2) installing the route with hard cells or soft cells?**** > > (3) what "conflict during route installation" mean? what kind of conflict= ? > **** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Qin,**** > > I have pretty much the same line of thought. I agree with the point that > 6top is independent from L3. What we are trying to do is define what L3 > will need to implement to obtain information from 6top. Obviously, 6top > will expose these interfaces in its standard implementation.**** > > **** > > Do you think finding the common requirements from 6top to L3 flows betwee= n > RPL and PCE is a good place to start? I am sure there are going to be som= e > specific requirements for each but they can be added as PCE or RPL specif= ic > primitives. I am not suggesting that we implement specific primitives for > every L3 protocol, but once we cover RPL and PCE I think we will satisfy > the requirements of most L3s.**** > > **** > > The different flows you have identified is perfect. **** > > (1) The flows from 6top -> L2 have been addressed quite extensively in th= e > draft already. There are a few flows from L2 -> 6top that have to be > addressed. GET_*TIMING_P*ARENT for e..g.**** > > (2) I would consider the requirements of PCE, RPL, (probably v6ND) in > terms of parameters required for route computation to define the general > requirements for flows between L3 and 6top. In the draft, you have alread= y > addressed some RPL specific primitives like control message delivery. I > think this should go in the RPL specific part. We define primitives to > expose parameters required by L3 to perform route computation in the > general flows. For e.g. L2 neighbor list, link quality to each neighbor. = We > need to specify the message format that needs to used by L3 to obtain thi= s > info.**** > > (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL > case, GET_*RPL_*PARENT will be one such flow as 6top needs to provide > the primitive GET_*TIMING_*PARENT in the L2->6top flow. A similar > primitive needs to be there for PCE.**** > > **** > > (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity > and 6top is the data provider. This is my own convention and hence the > clarification)**** > > **** > > Another critical part I want to get your opinions on is the following. We > have decided that irrespective of L3 (PCE or RPL) a node A will initiate > route installation request when it has data to send to node B. In this ca= se > -**** > > 1. How do resolve conflict during route installation? L3 computes a > route and send it over to 6top. Which in turn converts it to slot > reservations using the 6top -> L2 primitives in the slot frame. What i= f > there is a conflict during this slot reservation? What are the message= s > that will inform L3 and the node that route installation failed? This = must > also cause L3 to recompute its route.**** > 2. Then we have to ask, does 6top provide a mechanism to inform L3 > about failure and obtain a recomputed route (i.e.) perform n number of > retries. Or just fail after one try and leave it to the node to reinit= iate > a route request. **** > > -raghuram**** > > **** > > **** > > *From: *Qin Wang > *Date: *Thursday, August 15, 2013 6:00 AM > *To: *raghuram sudhaakar > *Cc: *"xvilajosana@eecs.berkeley.edu" > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram, **** > > **** > > Sorry for the late response. It is welcome for you to add flow informatio= n > if necessary.**** > > **** > > Just one thing I want to understand more clearly. I think 6top is a > relatively independent sublayer from upper layer. RPL is used as upper > layer in the first step, but, just one kind of upper layers in the future= . > Correct? **** > > **** > > In this sense, we should separate the general flow information to upper > layer and the specific flow information to RPL. Then, can we organize the > flow information related to 6top in this way?**** > > **** > > (1) flow information with L2, i.e. TSCH**** > > (2) general flow information with upper layer, may be L3 or L2.5**** > > (3) flow information with specific upper layer protocol like RPL.**** > > **** > > What do you think?**** > > **** > > Qin **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Ok. **** > > **** > > Qin, if you are OK I can add the flow information specific to RPL. **** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: *"xvilajosana@eecs.berkeley.edu" > > *Date: *Wednesday, August 14, 2013 2:32 PM > *To: *raghuram sudhaakar > *Cc: *Qin Wang > *Subject: *Re: Message flows**** > > **** > > Hi Raghuram,**** > > I let Qin answer as she is the main author. My opinion is that by now we > keep the document as a single file but we separate the two message flows. > IMHO, if you have information to add it is more than welcome! > > X**** > > **** > > On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) < > rsudhaak@cisco.com> wrote:**** > > Xavi, Qin,**** > > I believe that there is some information that needs to be added to the > message flows that will occur between L3 -> 6top and L2 -> 6top, in > addition to what is already there in Qin's draft. I wanted to check with > you guys if you want to add to the same document or split it into a > separate RFC. When I say split into separate RFC, what I mean is, L3 to > 6top is one RFC and L2 to 6top is another. The current draft has a lot of > information about L2 to 6top. I could add more about the RPL to 6top is i= ts > OK..**** > > **** > > -raghuram**** > > **** > > **** > > **** > > **** > > **** > > **** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --001a11c3f4a094d29704e44ea72c Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Qin, all,

    I agree with you analysis; I = believe it is important that we first start with the simplest case, i..e a = static schedule of shared slots. At the end this charter, we will have clea= rly identified how a full network operates in that case, and we then can st= art thinking about using a centralized/distributed scheduling mechanism.

    By then, we will have defined how to represent slots an= d cells in a non-verbose way (we started thinking about using BSON) as well= as statistics and commands. Ideally, we want that format to be usable in t= he centralized and distributed scheduling case, so although we are not talk= ing about this in the scope of this charter, we need to be aware how these = formats will be used, and we therefore need to identify the flows.

    Coming back to Raghuram's case, I would argue that = the cleanest approach for reserving cells is to have the upper layer explic= itly reserve either soft or hard cells. This does not prevent a hybrid case= , where one could imagine reserving a piece of the schedule for hard, anoth= er for soft cells. I believe it is, however, cleaner than having 6top ask a= bout L3 and somehow know what to do depending on the L3 being used.

    I believe there are two immediate next steps:
    - in light of this discussion, identifying what's missing from the bas= ic draft. Do you see anything obvious?
    - continue the work on BSO= N. Before delving into the representation of the information, I would first= identify what the contents of the different signaling packets are, which c= an easily be done in e.g. JSON.

    Does this make sense? If we have a rough agreement, I p= ropose we work on this and come up with a couple of slides for both items, = to be discussed on Friday.

    Thomas

    On Sat, Aug 17, 2013 at 3:13 PM, <P.Zand@= utwente.nl> wrote:

    Hi Qin,

    =A0<= /p>

    Many thanks for your clar= ification.

    Agreed,

    =A0<= /p>

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Saturday, August 17, 2013 11:33 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Pouria,

    =A0

    According to the new version of Charter, in the curr= ent step, we only consider the static case of building TSCH schedule. That = means the new node (node B) will use shared cells to send RPL control messa= ges like DAO to the existing node (node A). The set of shared cells will be advertised in EB by node A. And,= in the shared cells, node A should be awake for listening (at lease at the= beginning of timeslots) . So, even in the lack of signaling protocol and w= ithout installing a track, RPL should be able to work. Right?

    =A0

    Then, if RPL or other upper layer wants more bandwid= th, some centralized/distributed reservation mechanism will be needed. That= will be addressed in the next step. What do you think?

    =A0

    Qin

    =A0

    =A0

    =A0

    On Sat, Aug 17, 2013 at 11:56 PM, <P.Zand@utwente.nl> wrote:

    Hi Qin,<= /u>

    =A0<= /p>

    I agree with starting a n= ew threat and discuss about the details of the control flows.=

    =A0<= /p>

    =A0<= /p>

    Regarding to the interfac= e between 6top and higher layer (e.g. RPL), Let me explain my point with an example: Let=92s consider a new joined device, node A, that needs some = cells to start sending its RPL control packets to its parent node B. How do= es node A, upon choosing a new parent (node B), can reserve cells (e.g. for= exchanging RPL control packets like DAO or DIO)? How does node B (or node B=92 parent), who has just received = node A=92 DAO packet as its children, can reserve extra cells toward their = parent. In the lack of signaling protocol and without installing a track, i= s there any primitive that the RPL or 6top can use, to reserve some cells locally based on it DAO and DIO packet= rates with their parents?

    In order to handle this s= ituation in 6top, don=92t we need to import some information from the paren= t table and route table (in storing mode) from L3 to 6top? I mean how does a= RPL parent inform 6top about its children and descendants numbers and the = potential control messages rate (e.g. DAO) that it should forward toward th= e DODAG root? In addition how does the new device inform the 6top about its new parent?=A0 <= /u>

    You might say that DAO an= d DIO transmission rate might changes overtime and reserving resources does= n=92t make sense. But let=92s consider RPL control packets just as an example.

    Am I missing anything?=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Saturday, August 17, 2013 3:18 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Pouira,

    =A0

    I see your point. In the task item-1 "Timeslot = Management methods and formats", control flows will be defined (See th= e record for teleconference on 8/9). We can address the issue you mentioned above in that document. Maybe we should start a thread to di= scuss what the control flows should be, what the message contents should be= .

    =A0

    Regarding to the interface between 6top and RPL, my = understanding is RPL just use the TSCH schedule, instead of building the sc= hedule by using something like Soft cell creation. But, maybe, the status of TSCH schedule can be taken as a factor of RPL= 9;s OF. What do you think?

    =A0

    Qin

    =A0

    =A0

    =A0

    =A0

    On Fri, Aug 16, 2013 at 9:24 PM, <P.Zand@utwente.nl> wrote:=

    Qin,=

    =A0<= /p>

    I completely agree with y= ou that the status of the report/confirm form 6top to higher layer might be changed by other factors as well. My point is that, one of those factor= s, is the status of =93.confirm=94 primitives received form L2. I think in = 6top, we have to add them to the list of the factors that effect on the rep= ly/confirm to higher layer. Am I right?=A0=A0

    =A0<= /p>

    Regarding to (1), I think= , when the 6top commands/primitives are called by higher layer (either by PCE, potential signaling protocol, or temporary by RPL in the lack of sign= aling protocol) we have to send a =93.confirm=94 to inform them about the s= tatus of their requests. Am I right? I would say that in some cases we migh= t need to send the confirmation to PCE with the FAIL status.

    =A0<= /p>

    Regarding to (3), I agree= that the signaling protocol and PCE should call the cell creation commands= /primitives. Do you agree that 6top should be independent form the higher layer that ha= s called its primitives/command? Is there any limitation that in the lack o= f signaling protocol, the RPL can=92t call some of the 6top=92 management c= ommands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

    =A0<= /p>

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Pouria,

    =A0

    It is the process to create a hard cell and slotfram= e. You see,=A0=A0=93MLME-SET-SLOTFRAME.confirm= =94 and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usually = is one of factors to generate the confirmation message to higher layer. In = another word, when the status returned by=A0=A0=93MLME-SET-SLOTFRAME.confir= m=94 or =93MLME-SET-LINK.confirm=94 is False, the status reported from 6top to higher layer must be False. But, there may be= some other factors also making the status False.

    =A0

    Make sense?=

    =A0

    Qin<= /p>

    =A0

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:=

    Hi Qin,<= /u>

    Regarding to (2), this is= my understanding from the procedure for creating a hard cell and slotframe= . Am I missing something from 6top?

    =A0<= /p>

    <= u>

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Raghuram and Pouria,

    =A0

    The following is my understanding.

    =A0

    (1) Taking the assumption in Raghuram's example,= i.e. installing a route with hard cells, then, some role like PCE should e= xist and take responsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should = not happen. (But, it doesn't mean a confirmation message is not needed,= see the following) .

    =A0

    (2)=A0=A0=93MLME-SET-SLOT= FRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4= e. The confirmation to upper layer should come from the execution of 6top commands, which may = related with the two 15.4e primitives, but not exactly same.<= u>

    =A0

    (3) RPL is a routing protocol. It uses the TSCH sche= dule to forward packets, no matter the schedule is installed by PCE (hard c= ell) , or by some reservation protocol like RSVP (soft cell).

    =A0

    Make sense?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:=

    Hi Raghuram, Qin,<= u>

    Let me enter to your disc= ussion

    I agree with Raghuram tha= t when the higher layer call the 6top=92s commands (or .requests primitives= ) it should be informed about the status of its request by =93command reply= =94 or =93.confirm=94 primitives. The status of the =93.confirm=94 or =93re= ply=94 can be success, failure or =85

    Am I right?=

    I couldn=92t either find = the 6top=92s behavior upon receiving the =93MLME-SET-SLOTFRAME.confirm=94 o= r =93MLME-SET-LINK.confirm=94 primitives that might be called by L2. Did I miss that?

    =A0<= /p>

    Raghuram, I just have one= minor comment, in your example. I think that the RPL (L3) should use the =93Create soft cell command=94 to ask a new cell without specifying the ex= act cell. Because the L3 does not have enough information to ask for reserv= ing specific cell in L2. The =93Create hard cell command=94 should be calle= d by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he =93Create hard cell command=94 or RPL by calling =93Create soft cell com= mand=94 should be informed by 6top about the status of its request. For exa= mple, It might happen that PCE send a same request twice or RPL=92s request can=92t be serviced.

    AM I right?=

    =A0<= /p>

    Pouria.=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

    =A0

    HI Qin,

    The conflicts I am referring to are -

    =A0

    Consdiering multihop communication and = hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But another route 2 requires node A to listen on slot 35.=A0

    There may be other such conflicts that = we may need to resolve.

    =A0

    -raghuram

    =A0

    =A0

    Hi Raghuram,

    =A0

    I totally agree to your approach to def= ine the flow information to L3.

    =A0

    Regarding to your question, can you exp= lain more about:

    (1) from nodeA to nodeB is one hop or m= ulti-hop?

    (2) installing the route with hard cell= s or soft cells?

    (3) what "conflict during route in= stallation" mean? what kind of conflict?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 10:16 PM, Raghu= ram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of tho= ught. I agree with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain informatio= n from 6top. Obviously, 6top will expose these interfaces in its standard i= mplementation.

    =A0

    Do you think finding the common require= ments from 6top to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

    =A0

    The different flows you have identified= is perfect.=A0

    (1) The flows from 6top -> L2 have b= een addressed quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements o= f PCE, RPL, (probably v6ND) in terms of parameters required for route compu= tation to define the general requirements for flows between L3 and 6top. In the d= raft, you have already addressed some RPL specific primitives like control = message delivery. I think this should go in the RPL specific part. We defin= e primitives to expose parameters required by L3 to perform route computation in the general flows. For e.g.= L2 neighbor list, link quality to each neighbor. We need to specify the me= ssage format that needs to used by L3 to obtain this info.=

    (3) We will also need 6top->L3 flows= to be defined. For e.g., in the RPL case, =A0GET_RPL_PARENT will be= one such flow as 6top needs to provide the primitive GET_TIMING_PARENT = in the L2->6top flow. A similar primitive needs to be there for PCE.

    =A0

    (Note: when I say L2 -> 6top flow, I= mean L2 is the data requestor entity and 6top is the data provider. This i= s my own convention and hence the clarification)

    =A0

    Another critical part I want to get you= r opinions on is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

    =A0

    =A0

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

    =A0

    Hi Raghuram,

    =A0

    Sorry for the late response. It is welc= ome for you to add flow information if necessary.

    =A0

    Just one thing I want to understand mor= e clearly. I think 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct?=A0

    =A0

    In this sense, we should separate the g= eneral flow information to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

    =A0

    (1) flow information with L2, i.e. TSCH=

    (2) general flow information with upper= layer, may be L3 or L2.5

    (3) flow information with specific uppe= r layer protocol like RPL.

    =A0

    What do you think?=

    =A0

    Qin=A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 6:10 AM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Ok.=A0

    =A0

    Qin, if you are OK I can add the flow i= nformation specific to RPL.=A0

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

    =A0

    Hi Raghu= ram,

    I let Qin answer as she is the main aut= hor. My opinion is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

    =A0

    On Wed, Aug 14, 2013 at 1:42 PM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some informatio= n that needs to be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin&= #39;s draft. I wanted to check with you guys if you want to add to the same= document or split it into a separate RFC. When I say split into separate R= FC, =A0what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information abou= t L2 to 6top. I could add more about the RPL to 6top is its OK..<= /u>

    =A0<= /p>

    -raghuram

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
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Mon, 19 Aug 2013 10:05:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.943 X-Spam-Level: X-Spam-Status: No, score=-2.943 tagged_above=-999 required=5 tests=[AWL=0.033, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E68jshzXV3ny for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 10:04:59 -0700 (PDT) Received: from mail-ve0-f179.google.com (mail-ve0-f179.google.com [209.85.128.179]) by ietfa.amsl.com (Postfix) with ESMTP id 11DFB11E80DF for <6tsch@ietf.org>; Mon, 19 Aug 2013 10:04:58 -0700 (PDT) Received: by mail-ve0-f179.google.com with SMTP id c13so3108900vea.38 for <6tsch@ietf.org>; Mon, 19 Aug 2013 10:04:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=Wtr53/rgq9un8XdKUsZxYfoYGEL04olkWsZ5XhIuu3U=; b=C1JLrhbkrlPRpnKBn3xlW2cGvvWYqRZprI2ekFanbi9YlokuovX8uOuZKvEvgp85pp Q8IWCLRzj4VKi97yyh7rA2GTxTJG/4xSrS+GJU9hlyLuclX0fPbiyi4QVSCVsQ5pQW+K 1v96PiC5OpNHwNk/gdal4WpNfat48MYhByJJqZypAAf0BZXdPT4amgicSQ12/M9+uuSq Ozu9jPfNP5uWsu14pOGwsoNGuP/h6TwSBcvYknVMYUDJ3BmKmiGx9pOkdv5t+2Ne7DAC hV2IcJEwWtEmmit6Qj54D7CkD7maPC+8WwHhlU/18IJvVtVjRg5+3Le3lERzXGyuQCjA R37g== X-Gm-Message-State: ALoCoQnJgFK0FRlzFRsa8ei8Iqc0FNrPSFo7J92K/mgodmTVGEmWQK5Pcuwy+lH+7Dyb72u6KuFP MIME-Version: 1.0 X-Received: by 10.58.201.69 with SMTP id jy5mr1220944vec.29.1376931898383; Mon, 19 Aug 2013 10:04:58 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Mon, 19 Aug 2013 10:04:58 -0700 (PDT) In-Reply-To: References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852E82B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70E7F@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7136B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA71E0A@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA721D0@EXMBX23.ad.utwente.nl> Date: Tue, 20 Aug 2013 01:04:58 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/related; boundary=047d7bd6bb10aeec0c04e44ff0f9 Cc: 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 17:05:06 -0000 --047d7bd6bb10aeec0c04e44ff0f9 Content-Type: multipart/alternative; boundary=047d7bd6bb10aeec0904e44ff0f8 --047d7bd6bb10aeec0904e44ff0f8 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Thomas, I totally agree with you. Can you set two threads corresponding the two items in your email? I think it would be more organized. Thanks Qin On Mon, Aug 19, 2013 at 11:32 PM, Thomas Watteyne < watteyne@eecs.berkeley.edu> wrote: > Qin, all, > > I agree with you analysis; I believe it is important that we first start > with the simplest case, i..e a static schedule of shared slots. At the en= d > this charter, we will have clearly identified how a full network operates > in that case, and we then can start thinking about using a > centralized/distributed scheduling mechanism. > > By then, we will have defined how to represent slots and cells in a > non-verbose way (we started thinking about using BSON) as well as > statistics and commands. Ideally, we want that format to be usable in the > centralized and distributed scheduling case, so although we are not talki= ng > about this in the scope of this charter, we need to be aware how these > formats will be used, and we therefore need to identify the flows. > > Coming back to Raghuram's case, I would argue that the cleanest approach > for reserving cells is to have the upper layer explicitly reserve either > soft or hard cells. This does not prevent a hybrid case, where one could > imagine reserving a piece of the schedule for hard, another for soft cell= s. > I believe it is, however, cleaner than having 6top ask about L3 and someh= ow > know what to do depending on the L3 being used. > > I believe there are two immediate next steps: > - in light of this discussion, identifying what's missing from the basic > draft. Do you see anything obvious? > - continue the work on BSON. Before delving into the representation of th= e > information, I would first identify what the contents of the different > signaling packets are, which can easily be done in e.g. JSON. > > Does this make sense? If we have a rough agreement, I propose we work on > this and come up with a couple of slides for both items, to be discussed = on > Friday. > > Thomas > > On Sat, Aug 17, 2013 at 3:13 PM, wrote: > >> Hi Qin,**** >> >> ** ** >> >> Many thanks for your clarification.**** >> >> Agreed,**** >> >> ** ** >> >> Pouria**** >> >> ** ** >> >> *From:* Qin Wang [mailto:qinwang@berkeley.edu] >> *Sent:* Saturday, August 17, 2013 11:33 PM >> >> *To:* Zand, P. (EWI) >> *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org >> *Subject:* Re: Message flows**** >> >> ** ** >> >> Hi Pouria,**** >> >> ** ** >> >> According to the new version of Charter, in the current step, we only >> consider the static case of building TSCH schedule. That means the new n= ode >> (node B) will use shared cells to send RPL control messages like DAO to = the >> existing node (node A). The set of shared cells will be advertised in EB= by >> node A. And, in the shared cells, node A should be awake for listening (= at >> lease at the beginning of timeslots) . So, even in the lack of signaling >> protocol and without installing a track, RPL should be able to work. Rig= ht? >> **** >> >> ** ** >> >> Then, if RPL or other upper layer wants more bandwidth, some >> centralized/distributed reservation mechanism will be needed. That will = be >> addressed in the next step. What do you think?**** >> >> ** ** >> >> Qin**** >> >> ** ** >> >> ** ** >> >> ** ** >> >> On Sat, Aug 17, 2013 at 11:56 PM, wrote:**** >> >> Hi Qin,**** >> >> **** >> >> I agree with starting a new threat and discuss about the details of the >> control flows.**** >> >> **** >> >> **** >> >> Regarding to the interface between 6top and higher layer (e.g. RPL), Let >> me explain my point with an example: Let=92s consider a new joined devic= e, >> node A, that needs some cells to start sending its RPL control packets t= o >> its parent node B. How does node A, upon choosing a new parent (node B), >> can reserve cells (e.g. for exchanging RPL control packets like DAO or >> DIO)? How does node B (or node B=92 parent), who has just received node = A=92 >> DAO packet as its children, can reserve extra cells toward their parent.= In >> the lack of signaling protocol and without installing a track, is there = any >> primitive that the RPL or 6top can use, to reserve some cells locally ba= sed >> on it DAO and DIO packet rates with their parents? **** >> >> In order to handle this situation in 6top, don=92t we need to import som= e >> information from the parent table and route table (in storing mode) from= L3 >> to 6top? I mean how does a RPL parent inform 6top about its children and >> descendants numbers and the potential control messages rate (e.g. DAO) t= hat >> it should forward toward the DODAG root? In addition how does the new >> device inform the 6top about its new parent? **** >> >> You might say that DAO and DIO transmission rate might changes overtime >> and reserving resources doesn=92t make sense. But let=92s consider RPL c= ontrol >> packets just as an example.**** >> >> Am I missing anything? **** >> >> **** >> >> Pouria**** >> >> **** >> >> *From:* Qin Wang [mailto:qinwang@berkeley.edu] >> *Sent:* Saturday, August 17, 2013 3:18 PM**** >> >> >> *To:* Zand, P. (EWI) >> *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org >> *Subject:* Re: Message flows**** >> >> **** >> >> Pouira,**** >> >> **** >> >> I see your point. In the task item-1 "Timeslot Management methods and >> formats", control flows will be defined (See the record for teleconferen= ce >> on 8/9). We can address the issue you mentioned above in that document. >> Maybe we should start a thread to discuss what the control flows should = be, >> what the message contents should be.**** >> >> **** >> >> Regarding to the interface between 6top and RPL, my understanding is RPL >> just use the TSCH schedule, instead of building the schedule by using >> something like Soft cell creation. But, maybe, the status of TSCH schedu= le >> can be taken as a factor of RPL's OF. What do you think?**** >> >> **** >> >> Qin**** >> >> **** >> >> **** >> >> **** >> >> **** >> >> On Fri, Aug 16, 2013 at 9:24 PM, wrote:**** >> >> Qin,**** >> >> **** >> >> I completely agree with you that the status of the report/confirm form >> 6top to higher layer might be changed by other factors as well. My point= is >> that, one of those factors, is the status of =93.confirm=94 primitives r= eceived >> form L2. I think in 6top, we have to add them to the list of the factors >> that effect on the reply/confirm to higher layer. Am I right? **** >> >> **** >> >> Regarding to (1), I think, when the 6top commands/primitives are called >> by higher layer (either by PCE, potential signaling protocol, or tempora= ry >> by RPL in the lack of signaling protocol) we have to send a =93.confirm= =94 to >> inform them about the status of their requests. Am I right? I would say >> that in some cases we might need to send the confirmation to PCE with th= e >> FAIL status.**** >> >> **** >> >> Regarding to (3), I agree that the signaling protocol and PCE should cal= l >> the cell creation commands/primitives. Do you agree that 6top should be >> independent form the higher layer that has called its primitives/command= ? >> Is there any limitation that in the lack of signaling protocol, the RPL >> can=92t call some of the 6top=92 management commands/primitives (e.g. *S= oft >> cell creation*)? In this case, we might need to reply to RPL, by SUCCESS >> or FAIL status? Did I miss anything?**** >> >> **** >> >> Pouria**** >> >> **** >> >> *From:* Qin Wang [mailto:qinwang@berkeley.edu] >> *Sent:* Friday, August 16, 2013 2:05 PM**** >> >> >> *To:* Zand, P. (EWI) >> *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org >> *Subject:* Re: Message flows**** >> >> **** >> >> Hi Pouria,**** >> >> **** >> >> It is the process to create a hard cell and slotframe. You see, =93MLME= -SET-SLOTFRAME.confirm=94 >> and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which us= ually >> is one of factors to generate the confirmation message to higher layer. = In >> another word, when the status returned by =93MLME-SET-SLOTFRAME.confirm= =94 or >> =93MLME-SET-LINK.confirm=94 is False, the status reported from 6top to h= igher >> layer must be False. But, there may be some other factors also making th= e >> status False.**** >> >> **** >> >> Make sense?**** >> >> **** >> >> Qin**** >> >> **** >> >> On Fri, Aug 16, 2013 at 7:44 AM, wrote:**** >> >> Hi Qin,**** >> >> Regarding to (2), this is my understanding from the procedure for >> creating a hard cell and slotframe. Am I missing something from 6top?***= * >> >> **** >> >> **** >> >> Best Wishes,**** >> >> Pouria**** >> >> **** >> >> *From:* Qin Wang [mailto:qinwang@berkeley.edu] >> *Sent:* Friday, August 16, 2013 12:32 AM >> *To:* Zand, P. (EWI) >> *Cc:* Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org >> *Subject:* Re: Message flows**** >> >> **** >> >> Hi Raghuram and Pouria,**** >> >> **** >> >> The following is my understanding.**** >> >> **** >> >> (1) Taking the assumption in Raghuram's example, i.e. installing a route >> with hard cells, then, some role like PCE should exist and take >> responsibility to make conflict-free. In another word, the scenario >> described in the Raghuram's example should not happen. (But, it doesn't >> mean a confirmation message is not needed, see the following) .**** >> >> **** >> >> (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 ar= e >> primitives of 802.15.4e. The confirmation to upper layer should come fro= m >> the execution of 6top commands, which may related with the two 15.4e >> primitives, but not exactly same.**** >> >> **** >> >> (3) RPL is a routing protocol. It uses the TSCH schedule to forward >> packets, no matter the schedule is installed by PCE (hard cell) , or by >> some reservation protocol like RSVP (soft cell).**** >> >> **** >> >> Make sense?**** >> >> **** >> >> Thanks**** >> >> Qin**** >> >> **** >> >> **** >> >> **** >> >> On Fri, Aug 16, 2013 at 5:52 AM, wrote:**** >> >> Hi Raghuram, Qin,**** >> >> Let me enter to your discussion**** >> >> I agree with Raghuram that when the higher layer call the 6top=92s comma= nds >> (or .requests primitives) it should be informed about the status of its >> request by =93command reply=94 or =93.confirm=94 primitives. The status = of the >> =93.confirm=94 or =93reply=94 can be success, failure or =85**** >> >> Am I right?**** >> >> I couldn=92t either find the 6top=92s behavior upon receiving the >> =93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitiv= es that >> might be called by L2. Did I miss that?**** >> >> **** >> >> Raghuram, I just have one minor comment, in your example. I think that >> the RPL (L3) should use the =93Create soft cell command=94 to ask a new = cell >> without specifying the exact cell. Because the L3 does not have enough >> information to ask for reserving specific cell in L2. The =93Create hard= cell >> command=94 should be called by the one who has the global knowledge on >> network schedules, like PCE. However, I agree that the PCE by calling th= e >> =93Create hard cell command=94 or RPL by calling =93Create soft cell com= mand=94 >> should be informed by 6top about the status of its request. For example,= It >> might happen that PCE send a same request twice or RPL=92s request can= =92t be >> serviced. **** >> >> AM I right?**** >> >> **** >> >> Pouria. **** >> >> **** >> >> *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On >> Behalf Of *Raghuram Sudhaakar (rsudhaak) >> *Sent:* Thursday, August 15, 2013 9:07 PM >> *To:* Qin Wang >> *Cc:* 6tsch@ietf.org >> *Subject:* Re: [6tsch] Message flows**** >> >> **** >> >> HI Qin,**** >> >> The conflicts I am referring to are -**** >> >> **** >> >> Consdiering multihop communication and hard-cells**** >> >> 1. Route 1 requires a particular set of slots to be setup. Say node A >> must listen on slot number 11, 34, 65 and Tx on 13, 35, 68**** >> 2. But another route 2 requires node A to listen on slot 35. **** >> >> There may be other such conflicts that we may need to resolve.**** >> >> **** >> >> -raghuram**** >> >> **** >> >> **** >> >> Hi Raghuram, **** >> >> **** >> >> I totally agree to your approach to define the flow information to L3.**= * >> * >> >> **** >> >> Regarding to your question, can you explain more about:**** >> >> (1) from nodeA to nodeB is one hop or multi-hop?**** >> >> (2) installing the route with hard cells or soft cells?**** >> >> (3) what "conflict during route installation" mean? what kind of conflic= t? >> **** >> >> **** >> >> Thanks**** >> >> Qin**** >> >> **** >> >> **** >> >> **** >> >> On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) < >> rsudhaak@cisco.com> wrote:**** >> >> Qin,**** >> >> I have pretty much the same line of thought. I agree with the point that >> 6top is independent from L3. What we are trying to do is define what L3 >> will need to implement to obtain information from 6top. Obviously, 6top >> will expose these interfaces in its standard implementation.**** >> >> **** >> >> Do you think finding the common requirements from 6top to L3 flows >> between RPL and PCE is a good place to start? I am sure there are going = to >> be some specific requirements for each but they can be added as PCE or R= PL >> specific primitives. I am not suggesting that we implement specific >> primitives for every L3 protocol, but once we cover RPL and PCE I think = we >> will satisfy the requirements of most L3s.**** >> >> **** >> >> The different flows you have identified is perfect. **** >> >> (1) The flows from 6top -> L2 have been addressed quite extensively in >> the draft already. There are a few flows from L2 -> 6top that have to be >> addressed. GET_*TIMING_P*ARENT for e..g.**** >> >> (2) I would consider the requirements of PCE, RPL, (probably v6ND) in >> terms of parameters required for route computation to define the general >> requirements for flows between L3 and 6top. In the draft, you have alrea= dy >> addressed some RPL specific primitives like control message delivery. I >> think this should go in the RPL specific part. We define primitives to >> expose parameters required by L3 to perform route computation in the >> general flows. For e.g. L2 neighbor list, link quality to each neighbor.= We >> need to specify the message format that needs to used by L3 to obtain th= is >> info.**** >> >> (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL >> case, GET_*RPL_*PARENT will be one such flow as 6top needs to provide >> the primitive GET_*TIMING_*PARENT in the L2->6top flow. A similar >> primitive needs to be there for PCE.**** >> >> **** >> >> (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entit= y >> and 6top is the data provider. This is my own convention and hence the >> clarification)**** >> >> **** >> >> Another critical part I want to get your opinions on is the following. W= e >> have decided that irrespective of L3 (PCE or RPL) a node A will initiate >> route installation request when it has data to send to node B. In this c= ase >> -**** >> >> 1. How do resolve conflict during route installation? L3 computes a >> route and send it over to 6top. Which in turn converts it to slot >> reservations using the 6top -> L2 primitives in the slot frame. What = if >> there is a conflict during this slot reservation? What are the messag= es >> that will inform L3 and the node that route installation failed? This= must >> also cause L3 to recompute its route.**** >> 2. Then we have to ask, does 6top provide a mechanism to inform L3 >> about failure and obtain a recomputed route (i.e.) perform n number o= f >> retries. Or just fail after one try and leave it to the node to reini= tiate >> a route request. **** >> >> -raghuram**** >> >> **** >> >> **** >> >> *From: *Qin Wang >> *Date: *Thursday, August 15, 2013 6:00 AM >> *To: *raghuram sudhaakar >> *Cc: *"xvilajosana@eecs.berkeley.edu" >> *Subject: *Re: Message flows**** >> >> **** >> >> Hi Raghuram, **** >> >> **** >> >> Sorry for the late response. It is welcome for you to add flow >> information if necessary.**** >> >> **** >> >> Just one thing I want to understand more clearly. I think 6top is a >> relatively independent sublayer from upper layer. RPL is used as upper >> layer in the first step, but, just one kind of upper layers in the futur= e. >> Correct? **** >> >> **** >> >> In this sense, we should separate the general flow information to upper >> layer and the specific flow information to RPL. Then, can we organize th= e >> flow information related to 6top in this way?**** >> >> **** >> >> (1) flow information with L2, i.e. TSCH**** >> >> (2) general flow information with upper layer, may be L3 or L2.5**** >> >> (3) flow information with specific upper layer protocol like RPL.**** >> >> **** >> >> What do you think?**** >> >> **** >> >> Qin **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) < >> rsudhaak@cisco.com> wrote:**** >> >> Ok. **** >> >> **** >> >> Qin, if you are OK I can add the flow information specific to RPL. **** >> >> **** >> >> -raghuram**** >> >> **** >> >> *From: *Xavier Vilajosana Guillen >> *Reply-To: *"xvilajosana@eecs.berkeley.edu" < >> xvilajosana@eecs.berkeley.edu> >> *Date: *Wednesday, August 14, 2013 2:32 PM >> *To: *raghuram sudhaakar >> *Cc: *Qin Wang >> *Subject: *Re: Message flows**** >> >> **** >> >> Hi Raghuram,**** >> >> I let Qin answer as she is the main author. My opinion is that by now we >> keep the document as a single file but we separate the two message flows= . >> IMHO, if you have information to add it is more than welcome! >> >> X**** >> >> **** >> >> On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) < >> rsudhaak@cisco.com> wrote:**** >> >> Xavi, Qin,**** >> >> I believe that there is some information that needs to be added to the >> message flows that will occur between L3 -> 6top and L2 -> 6top, in >> addition to what is already there in Qin's draft. I wanted to check with >> you guys if you want to add to the same document or split it into a >> separate RFC. When I say split into separate RFC, what I mean is, L3 to >> 6top is one RFC and L2 to 6top is another. The current draft has a lot o= f >> information about L2 to 6top. I could add more about the RPL to 6top is = its >> OK..**** >> >> **** >> >> -raghuram**** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> **** >> >> ** ** >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7bd6bb10aeec0904e44ff0f8 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Thomas,

    I totally agree with you. Ca= n you set two threads corresponding the two items in your email? I think it= would be more organized.

    Thanks
    Qin



    On Mon, Aug 19, 2013 at 11:32 PM, Thomas Watteyne <wattey= ne@eecs.berkeley.edu> wrote:
    Qin, all,

    I agree with you analysis; I believe it is important that we first start = with the simplest case, i..e a static schedule of shared slots. At the end = this charter, we will have clearly identified how a full network operates i= n that case, and we then can start thinking about using a centralized/distr= ibuted scheduling mechanism.

    By then, we will have defined how to represent slots an= d cells in a non-verbose way (we started thinking about using BSON) as well= as statistics and commands. Ideally, we want that format to be usable in t= he centralized and distributed scheduling case, so although we are not talk= ing about this in the scope of this charter, we need to be aware how these = formats will be used, and we therefore need to identify the flows.

    Coming back to Raghuram's case, I would argue that = the cleanest approach for reserving cells is to have the upper layer explic= itly reserve either soft or hard cells. This does not prevent a hybrid case= , where one could imagine reserving a piece of the schedule for hard, anoth= er for soft cells. I believe it is, however, cleaner than having 6top ask a= bout L3 and somehow know what to do depending on the L3 being used.

    I believe there are two immediate next steps:
    - in light of this discussion, identifying what's missing from the bas= ic draft. Do you see anything obvious?
    - continue the work on BSO= N. Before delving into the representation of the information, I would first= identify what the contents of the different signaling packets are, which c= an easily be done in e.g. JSON.

    Does this make sense? If we have a rough agreement, I p= ropose we work on this and come up with a couple of slides for both items, = to be discussed on Friday.

    Thomas

    On Sat, Aug 17, 2013 = at 3:13 PM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    =A0<= /p>

    Many thanks for your clar= ification.

    Agreed,

    =A0<= /p>

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Saturday, August 17, 2013 11:33 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Pouria,

    =A0

    According to the new version of Charter, in the curr= ent step, we only consider the static case of building TSCH schedule. That = means the new node (node B) will use shared cells to send RPL control messa= ges like DAO to the existing node (node A). The set of shared cells will be advertised in EB by node A. And,= in the shared cells, node A should be awake for listening (at lease at the= beginning of timeslots) . So, even in the lack of signaling protocol and w= ithout installing a track, RPL should be able to work. Right?

    =A0

    Then, if RPL or other upper layer wants more bandwid= th, some centralized/distributed reservation mechanism will be needed. That= will be addressed in the next step. What do you think?

    =A0

    Qin

    =A0

    =A0

    =A0

    On Sat, Aug 17, 2013 at 11:56 PM, <P.Zand@utwente.nl> wrote:

    Hi Qin,<= /u>

    =A0<= /p>

    I agree with starting a n= ew threat and discuss about the details of the control flows.=

    =A0<= /p>

    =A0<= /p>

    Regarding to the interfac= e between 6top and higher layer (e.g. RPL), Let me explain my point with an example: Let=92s consider a new joined device, node A, that needs some = cells to start sending its RPL control packets to its parent node B. How do= es node A, upon choosing a new parent (node B), can reserve cells (e.g. for= exchanging RPL control packets like DAO or DIO)? How does node B (or node B=92 parent), who has just received = node A=92 DAO packet as its children, can reserve extra cells toward their = parent. In the lack of signaling protocol and without installing a track, i= s there any primitive that the RPL or 6top can use, to reserve some cells locally based on it DAO and DIO packet= rates with their parents?

    In order to handle this s= ituation in 6top, don=92t we need to import some information from the paren= t table and route table (in storing mode) from L3 to 6top? I mean how does a= RPL parent inform 6top about its children and descendants numbers and the = potential control messages rate (e.g. DAO) that it should forward toward th= e DODAG root? In addition how does the new device inform the 6top about its new parent?=A0 <= /u>

    You might say that DAO an= d DIO transmission rate might changes overtime and reserving resources does= n=92t make sense. But let=92s consider RPL control packets just as an example.

    Am I missing anything?=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Saturday, August 17, 2013 3:18 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Pouira,

    =A0

    I see your point. In the task item-1 "Timeslot = Management methods and formats", control flows will be defined (See th= e record for teleconference on 8/9). We can address the issue you mentioned above in that document. Maybe we should start a thread to di= scuss what the control flows should be, what the message contents should be= .

    =A0

    Regarding to the interface between 6top and RPL, my = understanding is RPL just use the TSCH schedule, instead of building the sc= hedule by using something like Soft cell creation. But, maybe, the status of TSCH schedule can be taken as a factor of RPL= 9;s OF. What do you think?

    =A0

    Qin

    =A0

    =A0

    =A0

    =A0

    On Fri, Aug 16, 2013 at 9:24 PM, <P.Zand@utwente.nl> wrote:=

    Qin,=

    =A0<= /p>

    I completely agree with y= ou that the status of the report/confirm form 6top to higher layer might be changed by other factors as well. My point is that, one of those factor= s, is the status of =93.confirm=94 primitives received form L2. I think in = 6top, we have to add them to the list of the factors that effect on the rep= ly/confirm to higher layer. Am I right?=A0=A0

    =A0<= /p>

    Regarding to (1), I think= , when the 6top commands/primitives are called by higher layer (either by PCE, potential signaling protocol, or temporary by RPL in the lack of sign= aling protocol) we have to send a =93.confirm=94 to inform them about the s= tatus of their requests. Am I right? I would say that in some cases we migh= t need to send the confirmation to PCE with the FAIL status.

    =A0<= /p>

    Regarding to (3), I agree= that the signaling protocol and PCE should call the cell creation commands= /primitives. Do you agree that 6top should be independent form the higher layer that ha= s called its primitives/command? Is there any limitation that in the lack o= f signaling protocol, the RPL can=92t call some of the 6top=92 management c= ommands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

    =A0<= /p>

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Pouria,

    =A0

    It is the process to create a hard cell and slotfram= e. You see,=A0=A0=93MLME-SET-SLOTFRAME.confirm= =94 and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usually = is one of factors to generate the confirmation message to higher layer. In = another word, when the status returned by=A0=A0=93MLME-SET-SLOTFRAME.confir= m=94 or =93MLME-SET-LINK.confirm=94 is False, the status reported from 6top to higher layer must be False. But, there may be= some other factors also making the status False.

    =A0

    Make sense?=

    =A0

    Qin<= /p>

    =A0

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:=

    Hi Qin,<= /u>

    Regarding to (2), this is= my understanding from the procedure for creating a hard cell and slotframe= . Am I missing something from 6top?

    =A0<= /p>

    <= u>

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

    =A0

    Hi Raghuram and Pouria,

    =A0

    The following is my understanding.

    =A0

    (1) Taking the assumption in Raghuram's example,= i.e. installing a route with hard cells, then, some role like PCE should e= xist and take responsibility to make conflict-free. In another word, the scenario described in the Raghuram's example should = not happen. (But, it doesn't mean a confirmation message is not needed,= see the following) .

    =A0

    (2)=A0=A0=93MLME-SET-SLOT= FRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4= e. The confirmation to upper layer should come from the execution of 6top commands, which may = related with the two 15.4e primitives, but not exactly same.<= u>

    =A0

    (3) RPL is a routing protocol. It uses the TSCH sche= dule to forward packets, no matter the schedule is installed by PCE (hard c= ell) , or by some reservation protocol like RSVP (soft cell).

    =A0

    Make sense?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:=

    Hi Raghuram, Qin,<= u>

    Let me enter to your disc= ussion

    I agree with Raghuram tha= t when the higher layer call the 6top=92s commands (or .requests primitives= ) it should be informed about the status of its request by =93command reply= =94 or =93.confirm=94 primitives. The status of the =93.confirm=94 or =93re= ply=94 can be success, failure or =85

    Am I right?=

    I couldn=92t either find = the 6top=92s behavior upon receiving the =93MLME-SET-SLOTFRAME.confirm=94 o= r =93MLME-SET-LINK.confirm=94 primitives that might be called by L2. Did I miss that?

    =A0<= /p>

    Raghuram, I just have one= minor comment, in your example. I think that the RPL (L3) should use the =93Create soft cell command=94 to ask a new cell without specifying the ex= act cell. Because the L3 does not have enough information to ask for reserv= ing specific cell in L2. The =93Create hard cell command=94 should be calle= d by the one who has the global knowledge on network schedules, like PCE. However, I agree that the PCE by calling t= he =93Create hard cell command=94 or RPL by calling =93Create soft cell com= mand=94 should be informed by 6top about the status of its request. For exa= mple, It might happen that PCE send a same request twice or RPL=92s request can=92t be serviced.

    AM I right?=

    =A0<= /p>

    Pouria.=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

    =A0

    HI Qin,

    The conflicts I am referring to are -

    =A0

    Consdiering multihop communication and = hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But another route 2 requires node A to listen on slot 35.=A0

    There may be other such conflicts that = we may need to resolve.

    =A0

    -raghuram

    =A0

    =A0

    Hi Raghuram,

    =A0

    I totally agree to your approach to def= ine the flow information to L3.

    =A0

    Regarding to your question, can you exp= lain more about:

    (1) from nodeA to nodeB is one hop or m= ulti-hop?

    (2) installing the route with hard cell= s or soft cells?

    (3) what "conflict during route in= stallation" mean? what kind of conflict?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 10:16 PM, Raghu= ram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of tho= ught. I agree with the point that 6top is independent from L3. What we are trying to do is define what L3 will need to implement to obtain informatio= n from 6top. Obviously, 6top will expose these interfaces in its standard i= mplementation.

    =A0

    Do you think finding the common require= ments from 6top to L3 flows between RPL and PCE is a good place to start? I am sure there are going to be some specific requirements for each but th= ey can be added as PCE or RPL specific primitives. I am not suggesting that= we implement specific primitives for every L3 protocol, but once we cover = RPL and PCE I think we will satisfy the requirements of most L3s.

    =A0

    The different flows you have identified= is perfect.=A0

    (1) The flows from 6top -> L2 have b= een addressed quite extensively in the draft already. There are a few flows from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for= e..g.

    (2) I would consider the requirements o= f PCE, RPL, (probably v6ND) in terms of parameters required for route compu= tation to define the general requirements for flows between L3 and 6top. In the d= raft, you have already addressed some RPL specific primitives like control = message delivery. I think this should go in the RPL specific part. We defin= e primitives to expose parameters required by L3 to perform route computation in the general flows. For e.g.= L2 neighbor list, link quality to each neighbor. We need to specify the me= ssage format that needs to used by L3 to obtain this info.=

    (3) We will also need 6top->L3 flows= to be defined. For e.g., in the RPL case, =A0GET_RPL_PARENT will be= one such flow as 6top needs to provide the primitive GET_TIMING_PARENT = in the L2->6top flow. A similar primitive needs to be there for PCE.

    =A0

    (Note: when I say L2 -> 6top flow, I= mean L2 is the data requestor entity and 6top is the data provider. This i= s my own convention and hence the clarification)

    =A0

    Another critical part I want to get you= r opinions on is the following. We have decided that irrespective of L3 (PCE or RPL) a node A will initiate route installation request when it has= data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

    =A0

    =A0

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

    =A0

    Hi Raghuram,

    =A0

    Sorry for the late response. It is welc= ome for you to add flow information if necessary.

    =A0

    Just one thing I want to understand mor= e clearly. I think 6top is a relatively independent sublayer from upper layer. RPL is used as upper layer in the first step, but, just one kind of= upper layers in the future. Correct?=A0

    =A0

    In this sense, we should separate the g= eneral flow information to upper layer and the specific flow information to RPL. Then, can we organize the flow information related to 6top in this= way?

    =A0

    (1) flow information with L2, i.e. TSCH=

    (2) general flow information with upper= layer, may be L3 or L2.5

    (3) flow information with specific uppe= r layer protocol like RPL.

    =A0

    What do you think?=

    =A0

    Qin=A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    On Thu, Aug 15, 2013 at 6:10 AM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Ok.=A0

    =A0

    Qin, if you are OK I can add the flow i= nformation specific to RPL.=A0

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

    =A0

    Hi Raghu= ram,

    I let Qin answer as she is the main aut= hor. My opinion is that by now we keep the document as a single file but we separate the two message flows. IMHO, if you have information to add it= is more than welcome!

    X

    =A0

    On Wed, Aug 14, 2013 at 1:42 PM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some informatio= n that needs to be added to the message flows that will occur between L3 -> 6top and L2 -> 6top, in addition to what is already there in Qin&= #39;s draft. I wanted to check with you guys if you want to add to the same= document or split it into a separate RFC. When I say split into separate R= FC, =A0what I mean is, L3 to 6top is one RFC and L2 to 6top is another. The current draft has a lot of information abou= t L2 to 6top. I could add more about the RPL to 6top is its OK..<= /u>

    =A0<= /p>

    -raghuram

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0


    _______________________________________________
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12:08:17 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: Qin Wang , Thomas Watteyne Thread-Topic: [6tsch] Message flows Thread-Index: AQHOnP6yxD89TjlGb0GiJttMx+iBcA== Date: Mon, 19 Aug 2013 17:08:17 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1854594B@xmb-rcd-x04.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.154.213.84] Content-Type: multipart/related; boundary="_004_2C3A8CAFDCAFCA41B8BF705CD9471C5B1854594Bxmbrcdx04ciscoc_"; type="multipart/alternative" MIME-Version: 1.0 Cc: 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Message flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 17:08:28 -0000 --_004_2C3A8CAFDCAFCA41B8BF705CD9471C5B1854594Bxmbrcdx04ciscoc_ Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1854594Bxmbrcdx04ciscoc_" --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1854594Bxmbrcdx04ciscoc_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Thomas, Agreed. Slides for Friday are a good idea. -raghuram From: Qin Wang > Date: Monday, August 19, 2013 10:04 AM To: Thomas Watteyne > Cc: 6TSCH <6tsch@ietf.org> Subject: Re: [6tsch] Message flows Hi Thomas, I totally agree with you. Can you set two threads corresponding the two ite= ms in your email? I think it would be more organized. Thanks Qin On Mon, Aug 19, 2013 at 11:32 PM, Thomas Watteyne > wrote: Qin, all, I agree with you analysis; I believe it is important that we first start wi= th the simplest case, i..e a static schedule of shared slots. At the end th= is charter, we will have clearly identified how a full network operates in = that case, and we then can start thinking about using a centralized/distrib= uted scheduling mechanism. By then, we will have defined how to represent slots and cells in a non-ver= bose way (we started thinking about using BSON) as well as statistics and c= ommands. Ideally, we want that format to be usable in the centralized and d= istributed scheduling case, so although we are not talking about this in th= e scope of this charter, we need to be aware how these formats will be used= , and we therefore need to identify the flows. Coming back to Raghuram's case, I would argue that the cleanest approach fo= r reserving cells is to have the upper layer explicitly reserve either soft= or hard cells. This does not prevent a hybrid case, where one could imagin= e reserving a piece of the schedule for hard, another for soft cells. I bel= ieve it is, however, cleaner than having 6top ask about L3 and somehow know= what to do depending on the L3 being used. I believe there are two immediate next steps: - in light of this discussion, identifying what's missing from the basic dr= aft. Do you see anything obvious? - continue the work on BSON. Before delving into the representation of the = information, I would first identify what the contents of the different sign= aling packets are, which can easily be done in e.g. JSON. Does this make sense? If we have a rough agreement, I propose we work on th= is and come up with a couple of slides for both items, to be discussed on F= riday. Thomas On Sat, Aug 17, 2013 at 3:13 PM, > wrote: Hi Qin, Many thanks for your clarification. Agreed, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Saturday, August 17, 2013 11:33 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Pouria, According to the new version of Charter, in the current step, we only consi= der the static case of building TSCH schedule. That means the new node (nod= e B) will use shared cells to send RPL control messages like DAO to the exi= sting node (node A). The set of shared cells will be advertised in EB by no= de A. And, in the shared cells, node A should be awake for listening (at le= ase at the beginning of timeslots) . So, even in the lack of signaling prot= ocol and without installing a track, RPL should be able to work. Right? Then, if RPL or other upper layer wants more bandwidth, some centralized/di= stributed reservation mechanism will be needed. That will be addressed in t= he next step. What do you think? Qin On Sat, Aug 17, 2013 at 11:56 PM, > wrote: Hi Qin, I agree with starting a new threat and discuss about the details of the con= trol flows. Regarding to the interface between 6top and higher layer (e.g. RPL), Let me= explain my point with an example: Let=92s consider a new joined device, no= de A, that needs some cells to start sending its RPL control packets to its= parent node B. How does node A, upon choosing a new parent (node B), can r= eserve cells (e.g. for exchanging RPL control packets like DAO or DIO)? How= does node B (or node B=92 parent), who has just received node A=92 DAO pac= ket as its children, can reserve extra cells toward their parent. In the la= ck of signaling protocol and without installing a track, is there any primi= tive that the RPL or 6top can use, to reserve some cells locally based on i= t DAO and DIO packet rates with their parents? In order to handle this situation in 6top, don=92t we need to import some i= nformation from the parent table and route table (in storing mode) from L3 = to 6top? I mean how does a RPL parent inform 6top about its children and de= scendants numbers and the potential control messages rate (e.g. DAO) that i= t should forward toward the DODAG root? In addition how does the new device= inform the 6top about its new parent? You might say that DAO and DIO transmission rate might changes overtime and= reserving resources doesn=92t make sense. But let=92s consider RPL control= packets just as an example. Am I missing anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Saturday, August 17, 2013 3:18 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Pouira, I see your point. In the task item-1 "Timeslot Management methods and forma= ts", control flows will be defined (See the record for teleconference on 8/= 9). We can address the issue you mentioned above in that document. Maybe we= should start a thread to discuss what the control flows should be, what th= e message contents should be. Regarding to the interface between 6top and RPL, my understanding is RPL ju= st use the TSCH schedule, instead of building the schedule by using somethi= ng like Soft cell creation. But, maybe, the status of TSCH schedule can be = taken as a factor of RPL's OF. What do you think? Qin On Fri, Aug 16, 2013 at 9:24 PM, > wrote: Qin, I completely agree with you that the status of the report/confirm form 6top= to higher layer might be changed by other factors as well. My point is tha= t, one of those factors, is the status of =93.confirm=94 primitives receive= d form L2. I think in 6top, we have to add them to the list of the factors = that effect on the reply/confirm to higher layer. Am I right? Regarding to (1), I think, when the 6top commands/primitives are called by = higher layer (either by PCE, potential signaling protocol, or temporary by = RPL in the lack of signaling protocol) we have to send a =93.confirm=94 to = inform them about the status of their requests. Am I right? I would say tha= t in some cases we might need to send the confirmation to PCE with the FAIL= status. Regarding to (3), I agree that the signaling protocol and PCE should call t= he cell creation commands/primitives. Do you agree that 6top should be inde= pendent form the higher layer that has called its primitives/command? Is th= ere any limitation that in the lack of signaling protocol, the RPL can=92t = call some of the 6top=92 management commands/primitives (e.g. Soft cell cre= ation)? In this case, we might need to reply to RPL, by SUCCESS or FAIL sta= tus? Did I miss anything? Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 2:05 PM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Pouria, It is the process to create a hard cell and slotframe. You see, =93MLME-SE= T-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 generates confirmati= on from L2, which usually is one of factors to generate the confirmation me= ssage to higher layer. In another word, when the status returned by =93MLM= E-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 is False, the sta= tus reported from 6top to higher layer must be False. But, there may be som= e other factors also making the status False. Make sense? Qin On Fri, Aug 16, 2013 at 7:44 AM, > wrote: Hi Qin, Regarding to (2), this is my understanding from the procedure for creating = a hard cell and slotframe. Am I missing something from 6top? [cid:image001.jpg@01CE9BA7.C7888620] Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Friday, August 16, 2013 12:32 AM To: Zand, P. (EWI) Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org Subject: Re: Message flows Hi Raghuram and Pouria, The following is my understanding. (1) Taking the assumption in Raghuram's example, i.e. installing a route wi= th hard cells, then, some role like PCE should exist and take responsibilit= y to make conflict-free. In another word, the scenario described in the Rag= huram's example should not happen. (But, it doesn't mean a confirmation mes= sage is not needed, see the following) . (2) =93MLME-SET-SLOTFRAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are p= rimitives of 802.15.4e. The confirmation to upper layer should come from th= e execution of 6top commands, which may related with the two 15.4e primitiv= es, but not exactly same. (3) RPL is a routing protocol. It uses the TSCH schedule to forward packets= , no matter the schedule is installed by PCE (hard cell) , or by some reser= vation protocol like RSVP (soft cell). Make sense? Thanks Qin On Fri, Aug 16, 2013 at 5:52 AM, > wrote: Hi Raghuram, Qin, Let me enter to your discussion I agree with Raghuram that when the higher layer call the 6top=92s commands= (or .requests primitives) it should be informed about the status of its re= quest by =93command reply=94 or =93.confirm=94 primitives. The status of th= e =93.confirm=94 or =93reply=94 can be success, failure or =85 Am I right? I couldn=92t either find the 6top=92s behavior upon receiving the =93MLME-S= ET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 primitives that migh= t be called by L2. Did I miss that? Raghuram, I just have one minor comment, in your example. I think that the = RPL (L3) should use the =93Create soft cell command=94 to ask a new cell wi= thout specifying the exact cell. Because the L3 does not have enough inform= ation to ask for reserving specific cell in L2. The =93Create hard cell com= mand=94 should be called by the one who has the global knowledge on network= schedules, like PCE. However, I agree that the PCE by calling the =93Creat= e hard cell command=94 or RPL by calling =93Create soft cell command=94 sho= uld be informed by 6top about the status of its request. For example, It mi= ght happen that PCE send a same request twice or RPL=92s request can=92t be= serviced. AM I right? Pouria. From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Raghuram Sudhaa= kar (rsudhaak) Sent: Thursday, August 15, 2013 9:07 PM To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] Message flows HI Qin, The conflicts I am referring to are - Consdiering multihop communication and hard-cells 1. Route 1 requires a particular set of slots to be setup. Say node A mu= st listen on slot number 11, 34, 65 and Tx on 13, 35, 68 2. But another route 2 requires node A to listen on slot 35. There may be other such conflicts that we may need to resolve. -raghuram Hi Raghuram, I totally agree to your approach to define the flow information to L3. Regarding to your question, can you explain more about: (1) from nodeA to nodeB is one hop or multi-hop? (2) installing the route with hard cells or soft cells? (3) what "conflict during route installation" mean? what kind of conflict? Thanks Qin On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Qin, I have pretty much the same line of thought. I agree with the point that 6t= op is independent from L3. What we are trying to do is define what L3 will = need to implement to obtain information from 6top. Obviously, 6top will exp= ose these interfaces in its standard implementation. Do you think finding the common requirements from 6top to L3 flows between = RPL and PCE is a good place to start? I am sure there are going to be some = specific requirements for each but they can be added as PCE or RPL specific= primitives. I am not suggesting that we implement specific primitives for = every L3 protocol, but once we cover RPL and PCE I think we will satisfy th= e requirements of most L3s. The different flows you have identified is perfect. (1) The flows from 6top -> L2 have been addressed quite extensively in the = draft already. There are a few flows from L2 -> 6top that have to be addres= sed. GET_TIMING_PARENT for e..g. (2) I would consider the requirements of PCE, RPL, (probably v6ND) in terms= of parameters required for route computation to define the general require= ments for flows between L3 and 6top. In the draft, you have already address= ed some RPL specific primitives like control message delivery. I think this= should go in the RPL specific part. We define primitives to expose paramet= ers required by L3 to perform route computation in the general flows. For e= .g. L2 neighbor list, link quality to each neighbor. We need to specify the= message format that needs to used by L3 to obtain this info. (3) We will also need 6top->L3 flows to be defined. For e.g., in the RPL ca= se, GET_RPL_PARENT will be one such flow as 6top needs to provide the prim= itive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to = be there for PCE. (Note: when I say L2 -> 6top flow, I mean L2 is the data requestor entity a= nd 6top is the data provider. This is my own convention and hence the clari= fication) Another critical part I want to get your opinions on is the following. We h= ave decided that irrespective of L3 (PCE or RPL) a node A will initiate rou= te installation request when it has data to send to node B. In this case - 1. How do resolve conflict during route installation? L3 computes a rout= e and send it over to 6top. Which in turn converts it to slot reservations = using the 6top -> L2 primitives in the slot frame. What if there is a confl= ict during this slot reservation? What are the messages that will inform L3= and the node that route installation failed? This must also cause L3 to re= compute its route. 2. Then we have to ask, does 6top provide a mechanism to inform L3 about= failure and obtain a recomputed route (i.e.) perform n number of retries. = Or just fail after one try and leave it to the node to reinitiate a route r= equest. -raghuram From: Qin Wang > Date: Thursday, August 15, 2013 6:00 AM To: raghuram sudhaakar > Cc: "xvilajosana@eecs.berkeley.edu" <= xvilajosana@eecs.berkeley.edu> Subject: Re: Message flows Hi Raghuram, Sorry for the late response. It is welcome for you to add flow information = if necessary. Just one thing I want to understand more clearly. I think 6top is a relativ= ely independent sublayer from upper layer. RPL is used as upper layer in th= e first step, but, just one kind of upper layers in the future. Correct? In this sense, we should separate the general flow information to upper lay= er and the specific flow information to RPL. Then, can we organize the flow= information related to 6top in this way? (1) flow information with L2, i.e. TSCH (2) general flow information with upper layer, may be L3 or L2.5 (3) flow information with specific upper layer protocol like RPL. What do you think? Qin On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsudhaak) > wrote: Ok. Qin, if you are OK I can add the flow information specific to RPL. -raghuram From: Xavier Vilajosana Guillen > Reply-To: "xvilajosana@eecs.berkeley.edu" > Date: Wednesday, August 14, 2013 2:32 PM To: raghuram sudhaakar > Cc: Qin Wang > Subject: Re: Message flows Hi Raghuram, I let Qin answer as she is the main author. My opinion is that by now we ke= ep the document as a single file but we separate the two message flows. IMH= O, if you have information to add it is more than welcome! X On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsudhaak) > wrote: Xavi, Qin, I believe that there is some information that needs to be added to the mess= age flows that will occur between L3 -> 6top and L2 -> 6top, in addition to= what is already there in Qin's draft. I wanted to check with you guys if y= ou want to add to the same document or split it into a separate RFC. When I= say split into separate RFC, what I mean is, L3 to 6top is one RFC and L2= to 6top is another. The current draft has a lot of information about L2 to= 6top. I could add more about the RPL to 6top is its OK.. -raghuram _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1854594Bxmbrcdx04ciscoc_ Content-Type: text/html; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: quoted-printable
    Thomas,
    Agreed. Slides for Friday are a good idea.

    -raghuram

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Monday, August 19, 2013 10:04= AM
    To: Thomas Watteyne <watteyne@eecs.berkeley.edu>
    Cc: 6TSCH <6tsch@ietf.org>
    Subject: Re: [6tsch] Message flows<= br>

    Hi Thomas,

    I totally agree with you. Can you set two threads corresponding the tw= o items in your email? I think it would be more organized.

    Thanks
    Qin



    On Mon, Aug 19, 2013 at 11:32 PM, Thomas Watteyn= e <watteyn= e@eecs.berkeley.edu> wrote:
    Qin, all,

    I agree with you analysis; I believe it is important that we first sta= rt with the simplest case, i..e a static schedule of shared slots. At the e= nd this charter, we will have clearly identified how a full network operate= s in that case, and we then can start thinking about using a centralized/distributed scheduling mechanism.=

    By then, we will have defined how to represent slots and cells in a no= n-verbose way (we started thinking about using BSON) as well as statistics = and commands. Ideally, we want that format to be usable in the centralized = and distributed scheduling case, so although we are not talking about this in the scope of this charter, we= need to be aware how these formats will be used, and we therefore need to = identify the flows.

    Coming back to Raghuram's case, I would argue that the cleanest approa= ch for reserving cells is to have the upper layer explicitly reserve either= soft or hard cells. This does not prevent a hybrid case, where one could i= magine reserving a piece of the schedule for hard, another for soft cells. I believe it is, however, clean= er than having 6top ask about L3 and somehow know what to do depending on t= he L3 being used.

    I believe there are two immediate next steps:
    - in light of this discussion, identifying what's missing from the bas= ic draft. Do you see anything obvious?
    - continue the work on BSON. Before delving into the representation of= the information, I would first identify what the contents of the different= signaling packets are, which can easily be done in e.g. JSON.

    Does this make sense? If we have a rough agreement, I propose we work = on this and come up with a couple of slides for both items, to be discussed= on Friday.

    Thomas

    On Sat, Aug 17, 2013 at 3:13 PM, <P.Zand@utwente.nl&= gt; wrote:

    Hi Qin,

     

    Many thanks for your clarification= .

    Agreed,

     

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Saturday, August 17, 2013 11:33 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Pouria,

     

    According to the new version of Charter, in the curr= ent step, we only consider the static case of building TSCH schedule. That = means the new node (node B) will use shared cells to send RPL control messa= ges like DAO to the existing node (node A). The set of shared cells will be advertised in EB by node A. And,= in the shared cells, node A should be awake for listening (at lease at the= beginning of timeslots) . So, even in the lack of signaling protocol and w= ithout installing a track, RPL should be able to work. Right?

     

    Then, if RPL or other upper layer wants more bandwid= th, some centralized/distributed reservation mechanism will be needed. That= will be addressed in the next step. What do you think?

     

    Qin

     

     

     <= /p>

    On Sat, Aug 17, 2013 at 11:56 PM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

     

    I agree with starting a new threat= and discuss about the details of the control flows.

     

     

    Regarding to the interface between= 6top and higher layer (e.g. RPL), Let me explain my point with an example:= Let=92s consider a new joined device, node A, that needs some cells to start sending its RPL control packets to = its parent node B. How does node A, upon choosing a new parent (node B), ca= n reserve cells (e.g. for exchanging RPL control packets like DAO or DIO)? = How does node B (or node B=92 parent), who has just received node A=92 DAO packet as its children, can reserve ex= tra cells toward their parent. In the lack of signaling protocol and withou= t installing a track, is there any primitive that the RPL or 6top can use, = to reserve some cells locally based on it DAO and DIO packet rates with their parents?

    In order to handle this situation = in 6top, don=92t we need to import some information from the parent table a= nd route table (in storing mode) from L3 to 6top? I mean how does a RPL parent inform 6top about its children an= d descendants numbers and the potential control messages rate (e.g. DAO) th= at it should forward toward the DODAG root? In addition how does the new de= vice inform the 6top about its new parent? 

    You might say that DAO and DIO tra= nsmission rate might changes overtime and reserving resources doesn=92t mak= e sense. But let=92s consider RPL control packets just as an example.

    Am I missing anything? 

     

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Saturday, August 17, 2013 3:18 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Pouira,

     

    I see your point. In the task item-1 "Timeslot = Management methods and formats", control flows will be defined (See th= e record for teleconference on 8/9). We can address the issue you mentioned= above in that document. Maybe we should start a thread to discuss what the control flows should be, what the message con= tents should be.

     

    Regarding to the interface between 6top and RPL, my = understanding is RPL just use the TSCH schedule, instead of building the sc= hedule by using something like Soft cell creation. But, maybe, the status o= f TSCH schedule can be taken as a factor of RPL's OF. What do you think?

     

    Qin

     

     

     

     <= /p>

    On Fri, Aug 16, 2013 at 9:24 PM, <P.Zand@utwente.nl> wrote:=

    Qin,

     

    I completely agree with you that t= he status of the report/confirm form 6top to higher layer might be changed = by other factors as well. My point is that, one of those factors, is the status of =93.confirm=94 primitives rec= eived form L2. I think in 6top, we have to add them to the list of the fact= ors that effect on the reply/confirm to higher layer. Am I right? &nbs= p;

     

    Regarding to (1), I think, when th= e 6top commands/primitives are called by higher layer (either by PCE, poten= tial signaling protocol, or temporary by RPL in the lack of signaling protocol) we have to send a =93.confirm=94= to inform them about the status of their requests. Am I right? I would say= that in some cases we might need to send the confirmation to PCE with the = FAIL status.

     

    Regarding to (3), I agree that the= signaling protocol and PCE should call the cell creation commands/primitiv= es. Do you agree that 6top should be independent form the higher layer that has called its primitives/command? = Is there any limitation that in the lack of signaling protocol, the RPL can= =92t call some of the 6top=92 management commands/primitives (e.g. Soft cell creation)? In this case, we might need to reply to RPL, by= SUCCESS or FAIL status? Did I miss anything?

     

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 2:05 PM


    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Pouria,

     

    It is the process to create a hard cell and slotfram= e. You see,  =93MLME-SET-SLOTFRAME.confirm=94= and =93MLME-SET-LINK.confirm=94 generates confirmation from L2, which usually is one of factors to generate the confirmation mess= age to higher layer. In another word, when the status returned by &nbs= p;=93MLME-SET-SLOTFRAME.confirm=94 or =93MLME-SET-LINK.confirm=94 is False,= the status reported from 6top to higher layer must be False. But, there may be some other factors also making the status Fals= e.

     

    Make sense?=

     

    Qin

     <= /p>

    On Fri, Aug 16, 2013 at 7:44 AM, <P.Zand@utwente.nl> wrote:=

    Hi Qin,

    Regarding to (2), this is my under= standing from the procedure for creating a hard cell and slotframe. Am I mi= ssing something from 6top?

     

    Best Wishes,<= /p>

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Friday, August 16, 2013 12:32 AM
    To: Zand, P. (EWI)
    Cc: Raghuram Sudhaakar (rsudhaak); 6tsch@ietf.org
    Subject: Re: Message flows

     

    Hi Raghuram and Pouria,

     

    The following is my understanding.

     

    (1) Taking the assumption in Raghuram's example, i.e= . installing a route with hard cells, then, some role like PCE should exist= and take responsibility to make conflict-free. In another word, the scenar= io described in the Raghuram's example should not happen. (But, it doesn't mean a confirmation message is not nee= ded, see the following) .

     

    (2)  =93MLME-SET-SLOTF= RAME.confirm=94 and =93MLME-SET-LINK.confirm=94 are primitives of 802.15.4e= . The confirmation to upper layer should come from the execution of 6top commands, which may related with the two 15.4e primitive= s, but not exactly same.

     

    (3) RPL is a routing protocol. It uses the TSCH sche= dule to forward packets, no matter the schedule is installed by PCE (hard c= ell) , or by some reservation protocol like RSVP (soft cell).=

     

    Make sense?

     

    Thanks

    Qin

     

     

     <= /p>

    On Fri, Aug 16, 2013 at 5:52 AM, <P.Zand@utwente.nl> wrote:=

    Hi Raghuram, Qin,=

    Let me enter to your discussion

    I agree with Raghuram that when th= e higher layer call the 6top=92s commands (or .requests primitives) it shou= ld be informed about the status of its request by =93command reply=94 or =93.confirm=94 primitives. The status of= the =93.confirm=94 or =93reply=94 can be success, failure or =85=

    Am I right?

    I couldn=92t either find the 6top= =92s behavior upon receiving the =93MLME-SET-SLOTFRAME.confirm=94 or =93MLM= E-SET-LINK.confirm=94 primitives that might be called by L2. Did I miss that?

     

    Raghuram, I just have one minor co= mment, in your example. I think that the RPL (L3) should use the =93Create = soft cell command=94 to ask a new cell without specifying the exact cell. Because the L3 does not have enough information= to ask for reserving specific cell in L2. The =93Create hard cell command= =94 should be called by the one who has the global knowledge on network sch= edules, like PCE. However, I agree that the PCE by calling the =93Create hard cell command=94 or RPL by calling = =93Create soft cell command=94 should be informed by 6top about the status = of its request. For example, It might happen that PCE send a same request t= wice or RPL=92s request can=92t be serviced.

    AM I right?

     

    Pouria.    &nb= sp;

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

     

    HI Qin,

    The conflicts I am referring to are -

     

    Consdiering multihop communication and hard-cells<= u>

    1. Route 1 requires a particular set of slots to be setup. = Say node A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But another route 2 requires node A = to listen on slot 35. 

    There may be other such conflicts that we may need to res= olve.

     

    -raghuram

     

     

    Hi Raghuram,

     

    I totally agree to your approach to define the flow infor= mation to L3.

     

    Regarding to your question, can you explain more about:

    (1) from nodeA to nodeB is one hop or multi-hop?

    (2) installing the route with hard cells or soft cells?

    (3) what "conflict during route installation" m= ean? what kind of conflict?

     

    Thanks

    Qin

     

     

     

    On Thu, Aug 15, 2013 at 10:16 PM, Raghuram Sudhaakar (rsu= dhaak) <rsudhaak= @cisco.com> wrote:

    Qin,

    I have pretty much the same line of thought. I agree with= the point that 6top is independent from L3. What we are trying to do is de= fine what L3 will need to implement to obtain information from 6top. Obviously, 6top will expose these interfa= ces in its standard implementation.

     

    Do you think finding the common requirements from 6top to= L3 flows between RPL and PCE is a good place to start? I am sure there are= going to be some specific requirements for each but they can be added as PCE or RPL specific primitives. I am not= suggesting that we implement specific primitives for every L3 protocol, bu= t once we cover RPL and PCE I think we will satisfy the requirements of mos= t L3s.

     

    The different flows you have identified is perfect. =

    (1) The flows from 6top -> L2 have been addressed quit= e extensively in the draft already. There are a few flows from L2 -> 6to= p that have to be addressed. GET_TIMING_PARENT for e..g.

    (2) I would consider the requirements of PCE, RPL, (proba= bly v6ND) in terms of parameters required for route computation to define t= he general requirements for flows between L3 and 6top. In the draft, you have already addressed some RPL specific pr= imitives like control message delivery. I think this should go in the RPL s= pecific part. We define primitives to expose parameters required by L3 to p= erform route computation in the general flows. For e.g. L2 neighbor list, link quality to each neighbor. W= e need to specify the message format that needs to used by L3 to obtain thi= s info.

    (3) We will also need 6top->L3 flows to be defined. Fo= r e.g., in the RPL case,  GET_RPL_PARENT will be one such flow = as 6top needs to provide the primitive GET_TIMING_PARENT in the L2->6top flow. A similar primitive needs to be there for PCE.

     

    (Note: when I say L2 -> 6top flow, I mean L2 is the da= ta requestor entity and 6top is the data provider. This is my own conventio= n and hence the clarification)

     

    Another critical part I want to get your opinions on is t= he following. We have decided that irrespective of L3 (PCE or RPL) a node A= will initiate route installation request when it has data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 co= mputes a route and send it over to 6top. Which in turn converts it to slot = reservations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservatio= n? What are the messages that will inform L3 and the node that route instal= lation failed? This must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a me= chanism to inform L3 about failure and obtain a recomputed route (i.e.) per= form n number of retries. Or just fail after one try and leave it to the node to reinitiate a route request. =

    -raghuram

     

     

    From: Qin Wang <= qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

     

    Hi Raghuram,

     

    Sorry for the late response. It is welcome for you to add= flow information if necessary.

     

    Just one thing I want to understand more clearly. I think= 6top is a relatively independent sublayer from upper layer. RPL is used as= upper layer in the first step, but, just one kind of upper layers in the future. Correct? <= u>

     

    In this sense, we should separate the general flow inform= ation to upper layer and the specific flow information to RPL. Then, can we= organize the flow information related to 6top in this way?

     

    (1) flow information with L2, i.e. TSCH<= /u>

    (2) general flow information with upper layer, may be L3 = or L2.5

    (3) flow information with specific upper layer protocol l= ike RPL.

     

    What do you think?

     

    Qin 

     

     

     

     

     

     

     

     

     

     

     

     

    On Thu, Aug 15, 2013 at 6:10 AM, Raghuram Sudhaakar (rsud= haak) <rsudhaak@= cisco.com> wrote:

    Ok. 

     

    Qin, if you are OK I can add the flow information specifi= c to RPL. 

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

     

    Hi Raghuram,=

    I let Qin answer as she is the main author. My opinion is= that by now we keep the document as a single file but we separate the two = message flows. IMHO, if you have information to add it is more than welcome!

    X

     

    On Wed, Aug 14, 2013 at 1:42 PM, Raghuram Sudhaakar (rsud= haak) <rsudhaak@= cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some information that needs to be= added to the message flows that will occur between L3 -> 6top and L2 -&= gt; 6top, in addition to what is already there in Qin's draft. I wanted to check with you guys if you want to add to the = same document or split it into a separate RFC. When I say split into separa= te RFC,  what I mean is, L3 to 6top is one RFC and L2 to 6top is anoth= er. The current draft has a lot of information about L2 to 6top. I could add more about the RPL to 6top is its OK..

     

    -raghuram=

     

     

     

     

     

     

     


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P.Zand@utwente.nl Mon Aug 19 10:57:50 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 77C2F11E8146 for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 10:57:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.276 X-Spam-Level: X-Spam-Status: No, score=-0.276 tagged_above=-999 required=5 tests=[AWL=0.227, BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Vs5hHwrMj1sE for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 10:57:42 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 2AD4711E82AF for <6tsch@ietf.org>; Mon, 19 Aug 2013 10:57:41 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Mon, 19 Aug 2013 19:57:40 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Mon, 19 Aug 2013 19:57:39 +0200 From: To: , <6tsch@ietf.org> Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWD//+R/gIAAIcgA///iD4CAABkTAIADNlmggATgRgCAASNqIA== Date: Mon, 19 Aug 2013 17:57:37 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34EXMBX23adutwent_" MIME-Version: 1.0 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 17:57:50 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34EXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thomas, I am not expert in synchronization, so please bear with me. By clock accuracy information, I mean how accurate a node can maintain (e.g= . =B11 ms) synchronization in the network for a period of time (e.g. 20 s) = without the need for clock update. Different devices might have different c= lock accuracy values represent by parts per million (ppm) unit. The clock a= ccuracy of a device might depend on the device' environment conditions (e.g= . temperature or shocks) and it doesn't just depend on crystals hardware. A= m I right? In the centralized approach, the System/Network managers, use (L2) device c= lock accuracy information as well as (L3) nodes' topology information (simi= lar to node's rank in RPL in 6tsch distributed approach) to select the pote= ntial clock sources in the network. Am I right? In a distributed approach, a network device might inform their neighbors ab= out its (L2) clock accuracy. A new device might use this information, as we= ll as L3 parameters (e.g. sender RPL' rank), to choose its timing parent. If in 6tsch, we are considering the case that all the nodes in the network = have equal high clock accuracy, then let's consider (L3) router's rank, bas= ed on the default OF (as Raghuram suggest), as the only factor for selectin= g timing parent. Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Monday, August 19, 2013 4:28 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, all, My 2c is the following. We already agreed on the fact that a mote's (RPL) r= outing parent would also be its (TSCH) time source neighbor. So why not pic= k the time source neighbor based on routing information? What exactly do you mean by clock accuracy? All nodes in a TSCH network nee= d to be able to synchronize with one another, and I don't think we are cons= idering cases where that is not true. Thomas On Thu, Aug 15, 2013 at 3:07 PM, > wrote: Raghuram, I agree with you that we need a method to pick a timing parent. We might need the L3 information on that, unless we can find a solution in = 6top to use L2 information. For example about the clock accuracy capabiliti= es of the device who has already joined the network. I am not sure if this = information is available in L2 and neighbor table. Best Wishes, Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Wednesday, August 14, 2013 12:57 AM To: xvilajosana@eecs.berkeley.edu; Za= nd, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang Subject: Re: [6tsch] RPL on Basic Xavi, Pouria, I think we need to keep node rank at 6top (as a read only parameter obtaine= d from L3) in order for the TSCH nodes to figure out the timing parent. In = the case where RPL node may have different ranks based on different OFs we = need a method to pick a timing parent. We should propose a default OF, that is used to compute the ranks for the p= urpose finding the timing parent. -raghuram From: Xavier Vilajosana Guillen > Reply-To: > Date: Tuesday, August 13, 2013 2:27 PM To: Pouria Zand > Cc: Thomas Watteyne >, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang = > Subject: Re: [6tsch] RPL on Basic Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, > wrote: Xavi, I guess we cannot keep "node rank" in the 6top. Because a node might have d= ifferent rank based on different metrics defined in L3. As a response, I do= n't think we can get all of those information form L3 and use them in neigh= bor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34EXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Thomas,=

     <= /p>

    I am not expert in synchr= onization, so please bear with me.

     <= /p>

    By clock accuracy informa= tion, I mean how accurate a node can maintain (e.g. =B11 ms) synchronizatio= n in the network for a period of time (e.g. 20 s) without the need for clock update. Different devices might have different clock ac= curacy values represent by parts per million (ppm) unit. The clock accuracy= of a device might depend on the device’ environment conditions (e.g.= temperature or shocks) and it doesn’t just depend on crystals hardware. Am I right?

     <= /p>

    In the centralized approa= ch, the System/Network managers, use (L2) device clock accuracy information= as well as (L3) nodes’ topology information (similar to node’s rank in RPL in 6tsch distributed approach) to select the pote= ntial clock sources in the network. Am I right?  

     <= /p>

    In a distributed approach= , a network device might inform their neighbors about its (L2) clock accura= cy. A new device might use this information, as well as L3 parameters (e.g. sender RPL’ rank), to choose its timing parent.<= o:p>

     <= /p>

    If in 6tsch, we are consi= dering the case that all the nodes in the network have equal high clock acc= uracy, then let’s consider (L3) router’s rank, based on the default OF (as Raghuram suggest), as the only factor for select= ing timing parent.

     <= /p>

    Pouria<= /p>

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria, all,

     

    My 2c is the following. We already agreed on the fac= t that a mote's (RPL) routing parent would also be its (TSCH) time source n= eighbor. So why not pick the time source neighbor based on routing informat= ion?

     

    What exactly do you mean by clock accuracy? All node= s in a TSCH network need to be able to synchronize with one another, and I = don't think we are considering cases where that is not true.

     

    Thomas

     

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:

    Raghuram,

    I agree with you that we need a method to pick a timi= ng parent.

    We might need the L3 information on that, unless we c= an find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

     

    From: Raghuram Sudhaakar (rs= udhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

     

    Xavi, Pouria,

    I think we need to keep node rank at 6top (as a read = only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

     

    We should propose a default OF, that is used to compu= te the ranks for the purpose finding the timing parent.

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

     

    Good point :-)

    agreed!
    X

     

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    I guess we cannot keep “node rank= ” in the 6top. Because a node might have different rank based on different metrics defined in L3. As a response, I don’t think we can= get all of those information form L3 and use them in neighbor table in 6to= p. Am I right?

    I think, as you mentioned we need to wo= rk on them.

     

    Pouria  

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Many thanks for your complete explanati= on. It absolutely makes sense.

     

    Just one minor question. The neighbor t= able will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?

    there are many different ways to implement that, this is an= option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about connect= ivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your description. Besides, there isn't a c= ommon shared cell to send KAs. I see the operation in the following way:

    6top KA timer expires and places a KA packet into the queue (e.g this ha= ppens every 30s). TSCH layer at the begining of a shared tx/rx slot then re= ads from the queue and sends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation us= ing Neighbors information described in Basic configuration.

        -this includes how = OF is calculated using numTx and numTxACK, etc..

     

    []

    -RPL configuration:<= /p>

         - storing mod= e vs non-storing mode (I vote for non-storing mode for a basic configuratio= n)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     

     

     

    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34EXMBX23adutwent_-- From qinwang@berkeley.edu Mon Aug 19 14:05:19 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5F0FD11E82F6 for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 14:05:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.946 X-Spam-Level: X-Spam-Status: No, score=-2.946 tagged_above=-999 required=5 tests=[AWL=0.030, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6vuOyalDbylq for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 14:05:14 -0700 (PDT) Received: from mail-vb0-f52.google.com (mail-vb0-f52.google.com [209.85.212.52]) by ietfa.amsl.com (Postfix) with ESMTP id B959021F9C99 for <6tsch@ietf.org>; Mon, 19 Aug 2013 14:05:13 -0700 (PDT) Received: by mail-vb0-f52.google.com with SMTP id f12so3641866vbg.11 for <6tsch@ietf.org>; Mon, 19 Aug 2013 14:05:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=pnjyddv9BK+E5H/tFJlkQ+R68xvepZ/Li1Qq0Y4kW/4=; b=hAeJjrbUWVCa0VWLQoFLjBpd/xlI8/bayvHyNYgUdrbqfQ0oeKsxAUX/0SBmmntc7I yQLQEjnVlTOr1d5y4mtoj8ZeBznRU5ZS6HkEdbmtoICU8NdCxgb2RuQt0SEqxgybEPwm nm1/BpE730A5F2Uf1GqsyUWziIxTMm7BdFXDe3d2c7xwKA9slO7aYwOelU1U9WKGctwN ki2r1+g6CpoK4B4ZNcGF/oRIDvi5isMvGuELQ/Z2zC9QzdLJRIdPfruC8I9qx2AIbxmF XxB8ZX1jZk5rEkI4g3tyzjWy5AInI16kpAtAzXN65RJD4viCH90nTNV0hRs21X9pxS4T GCGQ== X-Gm-Message-State: ALoCoQkoHvbsCQ4xfGKt75BXyPlTjrVQIvJZJLuO+XV+4a/m2z5Hqyn0EbHcCqYuZvUDYCBO36kH MIME-Version: 1.0 X-Received: by 10.58.137.167 with SMTP id qj7mr15078443veb.1.1376946312089; Mon, 19 Aug 2013 14:05:12 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Mon, 19 Aug 2013 14:05:11 -0700 (PDT) Date: Tue, 20 Aug 2013 05:05:11 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b677eface9bda04e4534b0d Subject: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 21:05:19 -0000 --047d7b677eface9bda04e4534b0d Content-Type: text/plain; charset=ISO-8859-1 Hi all, I separate a thread from thread "Message Flows", to discuss the format for management messages, e.g. JSON, BSON, or others. As Thomas's suggestion, before delving into the representation of the information, we firstly identify what the contents of the different signaling packets are, and in addition, what the data structures they may use. I would like to take the commands defined in draft-wang-6tsch-6top-00 as starting point. Here are the parameters in those commands. //integer (1) xxxID, e.g. TrackID, SlotframeID (2) xxxOffset, e.g. SlotOffset (3) NumOfxxx/Length (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority (5) Status (6) ASN (5Byte integer), e.g. last time when a packet received from a neighbor //string (7) L2 address (8) SecurityKey //bitmap (9) LinkOption //floating (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics Maybe something else........ Now, we can evaluate different representation methods. What do you think? Thanks Qin --047d7b677eface9bda04e4534b0d Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi all,

    I separate a thread from thread= "Message Flows", to discuss the format for management messages, = e.g. JSON, BSON, or others.

    As Thomas's sugges= tion, before de= lving into the representation of the information, we firstly identify what = the contents of the different signaling packets are, and in addition, what = the data structures they may use.=A0

    I would like to take the commands defined in=A0draft-wang-6tsch= -6top-00 as starting point. Here are the parameters in those commands.

    //integer
    (1) xxxID, e.g. TrackID, SlotframeI= D
    (2) xxxOffset, e.g. SlotOffset
    (3) NumOfxxx/Lengt= h
    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0
    (5) Status
    (6) ASN (5Byte integer), e.g. last time when a pac= ket received from a neighbor

    //string
    (7) L2 address
    (8) SecurityKey

    //bitma= p
    (9) LinkOption

    //floating
    (10) = Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics

    Maybe something else........

    Now, we can evaluate different representation methods. What do you think?

    Thanks
    Qin


    <= /div>
    =A0=A0
    --047d7b677eface9bda04e4534b0d-- From qinwang@berkeley.edu Mon Aug 19 15:54:28 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 72B3A11E8197 for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 15:54:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.949 X-Spam-Level: X-Spam-Status: No, score=-2.949 tagged_above=-999 required=5 tests=[AWL=0.027, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mRyWxa7J6CY3 for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 15:54:23 -0700 (PDT) Received: from mail-ve0-f173.google.com (mail-ve0-f173.google.com [209.85.128.173]) by ietfa.amsl.com (Postfix) with ESMTP id 5D36411E80F5 for <6tsch@ietf.org>; Mon, 19 Aug 2013 15:54:19 -0700 (PDT) Received: by mail-ve0-f173.google.com with SMTP id cy12so3401789veb.18 for <6tsch@ietf.org>; Mon, 19 Aug 2013 15:54:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=kYrXENsBqu4UtpobBRVTYtMM59o3Y4XoZT3uNPr6CxE=; b=dAhQboY4WdW5E+LVL8FYgd1/2UmWdWJIzw+3yDhuFwkjsQ5ySRRv1UrR5IoijoN6xr iwIYmAoePXbHys4WvZrh6fe7wVzb2ESDZrfZy+AgYxySZU50j0t+IAnwM2ZKEpnVxbNX 39qOXhB92RraSehRSt005K1lfTCxXv38GAIpHcvwXpT+ImLOedXPAoRryHlHoFMVijow rF5GSevs5I77DsPphVbMR5SEaYcU6ZNRXbQwbiCDA0O8xTRBpHROB2OXW2ALN6zS7Krm eVf5A7Q4DI2nSOg0Bog5Sp5Ls2mKmLr8liO83j0Z0a5SEmt2+fegwqSbJaNCbSbYqes4 3Yzw== X-Gm-Message-State: ALoCoQkwcjyVUb6phREKl5vPs9F4zlrVI8chfxqozvEcSRuKi744kguM+eS3fgvRRb8Iz4cyBi6J MIME-Version: 1.0 X-Received: by 10.58.100.234 with SMTP id fb10mr15751610veb.5.1376952854681; Mon, 19 Aug 2013 15:54:14 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Mon, 19 Aug 2013 15:54:14 -0700 (PDT) In-Reply-To: <52128ABD.3030800@berkeley.edu> References: <52128ABD.3030800@berkeley.edu> Date: Tue, 20 Aug 2013 06:54:14 +0800 Message-ID: From: Qin Wang To: Kris Pister , "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=089e013a2746c6a8f504e454d1ae Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Aug 2013 22:54:28 -0000 --089e013a2746c6a8f504e454d1ae Content-Type: text/plain; charset=ISO-8859-1 Hi Kris, You are right. Security Key should be a structured data, besides the key material, it should includes something like lifetime, KeyID, .....Correct? Many thanks! Qin On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote: > is the security key a string? That doesn't seem right. > > ksjp > > > On 8/19/2013 2:05 PM, Qin Wang wrote: > > Hi all, > > I separate a thread from thread "Message Flows", to discuss the format > for management messages, e.g. JSON, BSON, or others. > > As Thomas's suggestion, before delving into the representation of the > information, we firstly identify what the contents of the different > signaling packets are, and in addition, what the data structures they may > use. > > I would like to take the commands defined in draft-wang-6tsch-6top-00 as > starting point. Here are the parameters in those commands. > > //integer > (1) xxxID, e.g. TrackID, SlotframeID > (2) xxxOffset, e.g. SlotOffset > (3) NumOfxxx/Length > (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority > (5) Status > (6) ASN (5Byte integer), e.g. last time when a packet received from a > neighbor > > //string > (7) L2 address > (8) SecurityKey > > //bitmap > (9) LinkOption > > //floating > (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics > > Maybe something else........ > > Now, we can evaluate different representation methods. What do you think? > > Thanks > Qin > > > > > > _______________________________________________ > 6tsch mailing list6tsch@ietf.orghttps://www.ietf.org/mailman/listinfo/6tsch > > > --089e013a2746c6a8f504e454d1ae Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Kris,

    You are right. Security Key sh= ould be a structured data, besides the key material, it should includes som= ething like lifetime, KeyID, .....Correct?

    Many th= anks!

    Qin


    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@b= erkeley.edu> wrote:
    =20 =20 =20
    is the security key a string?=A0 That doesn't seem right.

    ksjp


    On 8/19/2013 2:05 PM, Qin Wang wrote:
    Hi all,

    I separate a thread from thread "Message Flows", to = discuss the format for management messages, e.g. JSON, BSON, or others.

    As Thomas's suggestion, before delving into the representation of the information, we firstly identify what the contents of the different signaling packets are, and in addition, what the data structures they may use.=A0
    I would like to take the commands defined in=A0draft-wang-6tsch-6top-00 as starting point. Here are the parameters in those commands.

    //integer
    (1) xxxID, e.g. TrackID, SlotframeID
    (2) xxxOffset, e.g. SlotOffset
    (3) NumOfxxx/Length
    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0
    (5) Status
    (6) ASN (5Byte integer), e.g. last time when a packet received from a neighbor

    //string
    (7) L2 address
    (8) SecurityKey

    //bitmap
    (9) LinkOption

    //floating
    (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics

    Maybe something else........

    Now, we can evaluate different representation methods. What do you think?

    Thanks
    Qin


    =A0=A0


    _______________________________________________
6tsch mailing list
6tsch@ietf.org
h=
ttps://www.ietf.org/mailman/listinfo/6tsch


    --089e013a2746c6a8f504e454d1ae-- From twatteyne@gmail.com Mon Aug 19 22:54:51 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 74AD411E81AF for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 22:54:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.873 X-Spam-Level: X-Spam-Status: No, score=-1.873 tagged_above=-999 required=5 tests=[AWL=0.104, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aEZInKef2phL for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 22:54:49 -0700 (PDT) Received: from mail-pa0-x22b.google.com (mail-pa0-x22b.google.com [IPv6:2607:f8b0:400e:c03::22b]) by ietfa.amsl.com (Postfix) with ESMTP id 1F49711E8190 for <6tsch@ietf.org>; Mon, 19 Aug 2013 22:54:49 -0700 (PDT) Received: by mail-pa0-f43.google.com with SMTP id hz10so295594pad.2 for <6tsch@ietf.org>; Mon, 19 Aug 2013 22:54:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=ppqttmcpypgl7o4F5KocRPjjdCLLgwonV1sCixi1+Q8=; b=ZVJzH+YTQfcuLXH+Hkmdt7NWAlLn6s2zEfOgFg1l361UkUESMgsKUW15k3046t4svL QMoenROnyIxlXT/ntAvBrmOnIIvZurRoK0UEb8uLvhEY5RgtRSX4whNrTOLQaKSNOBjN mnWV4noUJN/BHv5QFffX81uS2a3GyafbOO+CY2IGpScDMPgO30RbxmQSnSXYz4v33vCk lQs9wjtqLys0EBcUjOUnKki7H5vJsHTVB47JMBOPn027bEuVAZqpjaZGJTUNxhJSuHJ1 dAEFmFVn1q9GYTMN3Q8Ch7jypH31GCoVFncVTyQ2l2rf9qpW11uFNenvWvG/7nWAvPC1 RaCQ== X-Received: by 10.68.129.201 with SMTP id ny9mr5934379pbb.165.1376978087933; Mon, 19 Aug 2013 22:54:47 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Mon, 19 Aug 2013 22:54:27 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> From: Thomas Watteyne Date: Mon, 19 Aug 2013 22:54:27 -0700 X-Google-Sender-Auth: e6OGuHlezvf8qT7r4h0-z4p2Vsg Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b10cae5cb835104e45ab118 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Aug 2013 05:54:51 -0000 --047d7b10cae5cb835104e45ab118 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Pouria, Thanks for the explanation. Allow me to answer inline. Thomas On Mon, Aug 19, 2013 at 10:57 AM, wrote: > Thomas,**** > > ** ** > > I am not expert in synchronization, so please bear with me.**** > > ** ** > > By clock accuracy information, I mean how accurate a node can maintain > (e.g. =B11 ms) synchronization in the network for a period of time (e.g. = 20 > s) without the need for clock update. Different devices might have > different clock accuracy values represent by parts per million (ppm) unit= . > The clock accuracy of a device might depend on the device=92 environment > conditions (e.g. temperature or shocks) and it doesn=92t just depend on > crystals hardware. Am I right? > Agreed. I am used to the term "clock drift" for the phenomenon, but absolutely, drift depends on manufacturing, voltage, temperature, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronization needs to happen, given a guard time (i.e. 1ms). Of course, all these parameters depend on each other, so you can imagine buying a better clock source, or changing the re-synchronization frequency, or changing the guard time. **** > > ** In the centralized approach, the System/Network managers, use (L2) > device clock accuracy information as well as (L3) nodes=92 topology > information (similar to node=92s rank in RPL in 6tsch distributed approac= h) > to select the potential clock sources in the network. Am I right? > Hmm. I understand what you are proposing, but my first reaction is to be a bit afraid that basing time source neighbor selection on clock drift information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my neighbor, could I not resolve that locally (through all kind of techniques we can think of), rather than involving the time source neighbor selection process in that? > In a distributed approach, a network device might inform their neighbors > about its (L2) clock accuracy. A new device might use this information, a= s > well as L3 parameters (e.g. sender RPL=92 rank), to choose its timing par= ent. > This would certainly invert the approach. Now, we let RPL select routing parents, and then we have TSCH just use the same. If we go the other way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the first of which are synchronization loops. > ** If in 6tsch, we are considering the case that all the nodes in the > network have equal high clock accuracy, then let=92s consider (L3) router= =92s > rank, based on the *default OF* (as Raghuram suggest), as the only factor > for selecting timing parent. > > ** > I would go that route, but maybe you have some counter example in mind? > Pouria**** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Monday, August 19, 2013 4:28 AM > *To:* 6TSCH > > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Pouria, all,**** > > ** ** > > My 2c is the following. We already agreed on the fact that a mote's (RPL) > routing parent would also be its (TSCH) time source neighbor. So why not > pick the time source neighbor based on routing information?**** > > ** ** > > What exactly do you mean by clock accuracy? All nodes in a TSCH network > need to be able to synchronize with one another, and I don't think we are > considering cases where that is not true.**** > > ** ** > > Thomas**** > > ** ** > > On Thu, Aug 15, 2013 at 3:07 PM, wrote:**** > > Raghuram,**** > > I agree with you that we need a method to pick a timing parent.**** > > We might need the L3 information on that, unless we can find a solution i= n > 6top to use L2 information. For example about the clock accuracy > capabilities of the device who has already joined the network. I am not > sure if this information is available in L2 and neighbor table.**** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] > *Sent:* Wednesday, August 14, 2013 12:57 AM > *To:* xvilajosana@eecs.berkeley.edu; Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org; Qin Wang**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Xavi, Pouria,**** > > I think we need to keep node rank at 6top (as a read only parameter > obtained from L3) in order for the TSCH nodes to figure out the timing > parent. In the case where RPL node may have different ranks based on > different OFs we need a method to pick a timing parent.**** > > **** > > We should propose a default OF, that is used to compute the ranks for the > purpose finding the timing parent.**** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: * > *Date: *Tuesday, August 13, 2013 2:27 PM > *To: *Pouria Zand > *Cc: *Thomas Watteyne , "6tsch@ietf.org" < > 6tsch@ietf.org>, Qin Wang > *Subject: *Re: [6tsch] RPL on Basic**** > > **** > > Good point :-)**** > > agreed! > X**** > > **** > > On Tue, Aug 13, 2013 at 2:20 PM, wrote:**** > > Xavi,**** > > **** > > I guess we cannot keep =93node rank=94 in the 6top. Because a node might = have > different rank based on different metrics defined in L3. As a response, I > don=92t think we can get all of those information form L3 and use them in > neighbor table in 6top. Am I right? **** > > I think, as you mentioned we need to work on them. **** > > **** > > Pouria **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 11:13 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria, > > yes the neighbor table is something that 6top takes care of. The fields o= f > the table is something that we need to work on, stats for sure as describ= ed > by the basic configuration draft. As regards to the rank, in our > implementation, we keep it in the table, for each neighbour we keep its > rank. This information can be placed somewhere else if you want but I gue= ss > we need it to keep some sense on what is the rank of our neighbors.**** > > regards,**** > > Xavi**** > > **** > > **** > > On Tue, Aug 13, 2013 at 2:05 PM, wrote:**** > > Xavi,**** > > **** > > Many thanks for your complete explanation. It absolutely makes sense.**** > > **** > > Just one minor question. The neighbor table will be stored in 6top. Am I > right? If yes, do we need to store rank information (included in DIO) in > that table? Or we just store neighbor statistic?**** > > **** > > Pouria **** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 10:17 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > answer inline:**** > > Xavi,**** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > there are many different ways to implement that, this is an option.**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI?**** > > These are the list of known neighbors with acceptable RSSI, so yes if it > wants to keep all of them.**** > > Or (2) the node should probe its connection with the its RPL parent and > its RPL child? In the case (2), how does the 6top can inform the L3 about > the new potential discovered neighbors and their connection status? **** > > When a node is discovered due to receiving and EB (at least in our openws= n > implementation), it is inserted at the neighbor table. At that point no > information about connectivity can be used except RSSI. As soon as a DIO = is > received from that node, its information is updated (including rank). As = we > don't have any information about connectivity (as RFC6552 describes) an > initial value is set (i.e rank + FOO). In openwsn a similar case to (1) i= s > used so eventually some stats of the link can be used to compute the ETX > and let RPL do its work. **** > > So RPL knows about a new node because 6TOP keeps information of neighbors > an eventually this information is used by RPL to update routes. As this > node sends DIOs and receives DIOs from others the information is > permanently being updated enabling a node to be positioned in the multiho= p > topology.**** > > Does it make sense?**** > > Pouria**** > > **** > > On Tue, Aug 13, 2013 at 12:40 PM, wrote:**** > > Xavi,**** > > **** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > **** > > Pouria**** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > **** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:*6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > **** > > ** ** > --047d7b10cae5cb835104e45ab118 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Pouria,
    Thanks for the explanation. Allow me to answer= inline.
    Thomas

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl>= ; wrote:

    Thomas,

    =A0<= /p>

    I am not expert in synchr= onization, so please bear with me.

    =A0<= /p>

    By clock accuracy informa= tion, I mean how accurate a node can maintain (e.g. =B11 ms) synchronizatio= n in the network for a period of time (e.g. 20 s) without the need for clock update. Different devices might have different clock ac= curacy values represent by parts per million (ppm) unit. The clock accuracy= of a device might depend on the device=92 environment conditions (e.g. tem= perature or shocks) and it doesn=92t just depend on crystals hardware. Am I right?


    Agreed. I am used to the term "clock drift&= quot; for the phenomenon, but absolutely, drift depends on manufacturing, v= oltage, temperature, and probably other environmental factors. The amount o= f drift of your clock source will dictate how often resynchronization needs= to happen, given a guard time (i.e. 1ms). Of course, all these parameters = depend on each other, so you can imagine buying a better clock source, or c= hanging the re-synchronization frequency, or changing the guard time.

    =A0= In the centralized approach, the System/Network managers, use (L2) device c= lock accuracy information as well as (L3) nodes=92 topology information (si= milar to node=92s rank in RPL in 6tsch distributed approach) to select the potentia= l clock sources in the network. Am I right?=A0


    Hmm. I understand what you are proposing, but my first= reaction is to be a bit afraid that basing time source neighbor selection = on clock drift information might lead to lots of complexity, for not much g= ain (I think). If I am drifting a lot wrt to my neighbor, could I not resol= ve that locally (through all kind of techniques we can think of), rather th= an involving the time source neighbor selection process in that?
    =A0

    =A0In a distributed approach, a network device might inform= their neighbors about its (L2) clock accuracy. A new device might use this= information, as well as L3 parameters (e.g. sender RPL=92 rank), to choose its timing parent.


    This would certainly inv= ert the approach. Now, we let RPL select routing parents, and then we have = TSCH just use the same. If we go the other way around, i.e. select time sou= rce neighbors, then routes, many things will get complicated real quick, th= e first of which are synchronization loops.
    =A0

    =A0= If in 6tsch, we are considering the case that all the nodes in the network = have equal high clock accuracy, then let=92s consider (L3) router=92s rank,= based on the default OF (as Raghuram suggest), as the only = factor for selecting timing parent.

    =A0

    I would go that route, but maybe you have some co= unter example in mind?
    =A0

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria, all,

    =A0

    My 2c is the following. We already agreed on the fac= t that a mote's (RPL) routing parent would also be its (TSCH) time sour= ce neighbor. So why not pick the time source neighbor based on routing info= rmation?

    =A0

    What exactly do you mean by clock accuracy? All node= s in a TSCH network need to be able to synchronize with one another, and I = don't think we are considering cases where that is not true.<= /u>

    =A0

    Thomas

    =A0

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:=

    Raghuram,

    I agree with you that we need a method = to pick a timing parent.

    We might need the L3 information on tha= t, unless we can find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Raghuram= Sudhaakar (rsudhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Xavi, Pouria,

    I think we need to keep node rank at 6t= op (as a read only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

    =A0

    We should propose a default OF, that is= used to compute the ranks for the purpose finding the timing parent.

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Good poi= nt :-)

    agreed!
    X

    =A0

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl&= gt; wrote:

    Xavi,

    =A0<= /p>

    I guess we cannot keep = =93node rank=94 in the 6top. Because a node might have different rank based= on different metrics defined in L3. As a response, I don=92t think we can get= all of those information form L3 and use them in neighbor table in 6top. A= m I right?

    I think, as you mentioned= we need to work on them.

    =A0<= /p>

    Pouria =A0<= u>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

    =A0

    =A0

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:=

    Xavi,

    =A0<= /p>

    Many thanks for your comp= lete explanation. It absolutely makes sense.

    =A0<= /p>

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    answer inline:=

    Xavi,

    Keep Alive timer expires for =93node A=94 aft= er 30s if no frames have been sent (or received) to (or from) neighbor =93n= ode B=94. Am I right?

    there are many different ways to implement that, this is an= option.

    =A0

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about con= nectivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

    =A0

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or from) neighbor =93node B=94. Am I right?

    =A0<= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status? =A0=A0=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the= following way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.=

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From:6tsch-bounces@ietf.org= [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchron= ized with its RPL parent. In the absence of traffic, the node will periodic= ally "keep alive" (per Xavi's e-mail) to the parent. How ofte= n depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:<= u>

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function = calculation using Neighbors information described in Basic configuration.

    =A0=A0=A0 -this includes= how OF is calculated using numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing m= ode vs non-storing mode (I vote for non-storing mode for a basic configurat= ion)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0

    =A0

    =A0


    --047d7b10cae5cb835104e45ab118-- From twatteyne@gmail.com Mon Aug 19 23:08:09 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2C43A11E80D2 for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 23:08:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.884 X-Spam-Level: X-Spam-Status: No, score=-1.884 tagged_above=-999 required=5 tests=[AWL=0.093, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id j1KZrEf7WSJf for <6tsch@ietfa.amsl.com>; Mon, 19 Aug 2013 23:08:06 -0700 (PDT) Received: from mail-pd0-x231.google.com (mail-pd0-x231.google.com [IPv6:2607:f8b0:400e:c02::231]) by ietfa.amsl.com (Postfix) with ESMTP id 8EBA811E81B1 for <6tsch@ietf.org>; Mon, 19 Aug 2013 23:08:05 -0700 (PDT) Received: by mail-pd0-f177.google.com with SMTP id y10so6133550pdj.8 for <6tsch@ietf.org>; Mon, 19 Aug 2013 23:08:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=dnxY3VGZ9lcHxcKR0rPITHpq0qqZGrHSXPSRDteyQeE=; b=M5edCs/xxIW6rh7j7HRLK6Dm/toMXG3dXYvWKD+aPQMtQ1QunsAJDQeWo3ODP287ib ziHdIotuSryyIdwKNQec/nsxKcu7uOeXUsmq7dC4Rtx/zBK5AAVbuDfp3Ivnxt5h8L6m LKFrPTvvtXapyN3j35qN/38oEsFxUVzEjb6D9D0RlkECYGhL2adfcDCOSBreMQdEMZ4L xBfF1GALckh1QdBO78FwQfBbPg1ycnnoJhX3MXUM4UzJf8cdVRmGF+ZGuC6q9AvQR7tP q2EXrIiuwDlIU997AAwEHjm7UKjatPAgx7s//5/aSEEARNKwDWtN0lRlXRAdt+QTNKf0 lycw== X-Received: by 10.68.139.201 with SMTP id ra9mr17043995pbb.46.1376978885211; Mon, 19 Aug 2013 23:08:05 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Mon, 19 Aug 2013 23:07:45 -0700 (PDT) In-Reply-To: References: <52128ABD.3030800@berkeley.edu> From: Thomas Watteyne Date: Mon, 19 Aug 2013 23:07:45 -0700 X-Google-Sender-Auth: iC-jre2huJwBpAzoFUxi8l32gc4 Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=001a11c3f4a050fdc904e45ae1ac Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Aug 2013 06:08:09 -0000 --001a11c3f4a050fdc904e45ae1ac Content-Type: text/plain; charset=ISO-8859-1 Qin, Thanks for starting the thread! I have comment which my sound a bit vague, but it's on purpose :) Do you envision that the flows will match the 6tos commands exactly? That is, are you considering that the packets sent between different devices in the network (PCE, motes, etc) contain the same commands as the 6top set of commands from http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4? Maybe we could by identifying the flows that we are considering, then the contents of those packets (possibly described using some high level representation such as JSON), and only then worry about their efficient representation (e.g. BSON). Just a thought. Thomas On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote: > Hi Kris, > > You are right. Security Key should be a structured data, besides the key > material, it should includes something like lifetime, KeyID, .....Correct? > > Many thanks! > > Qin > > > On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote: > >> is the security key a string? That doesn't seem right. >> >> ksjp >> >> >> On 8/19/2013 2:05 PM, Qin Wang wrote: >> >> Hi all, >> >> I separate a thread from thread "Message Flows", to discuss the format >> for management messages, e.g. JSON, BSON, or others. >> >> As Thomas's suggestion, before delving into the representation of the >> information, we firstly identify what the contents of the different >> signaling packets are, and in addition, what the data structures they may >> use. >> >> I would like to take the commands defined in draft-wang-6tsch-6top-00 >> as starting point. Here are the parameters in those commands. >> >> //integer >> (1) xxxID, e.g. TrackID, SlotframeID >> (2) xxxOffset, e.g. SlotOffset >> (3) NumOfxxx/Length >> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority >> (5) Status >> (6) ASN (5Byte integer), e.g. last time when a packet received from a >> neighbor >> >> //string >> (7) L2 address >> (8) SecurityKey >> >> //bitmap >> (9) LinkOption >> >> //floating >> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics >> >> Maybe something else........ >> >> Now, we can evaluate different representation methods. What do you >> think? >> >> Thanks >> Qin >> >> >> >> >> >> _______________________________________________ >> 6tsch mailing list6tsch@ietf.orghttps://www.ietf.org/mailman/listinfo/6tsch >> >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --001a11c3f4a050fdc904e45ae1ac Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Qin,

    Thanks for starting the thread! I = have comment which my sound a bit vague, but it's on purpose :)

    Do you envision that the flows will match the 6tos comman= ds exactly? That is, are you considering that the packets sent between diff= erent devices in the network (PCE, motes, etc) contain the same commands as= the 6top set of commands from=A0http://tools.ietf.org/html/draft-wang-6ts= ch-6top-00#section-2.4?

    Maybe we could by identifying the flows that we are con= sidering, then the contents of those packets (possibly described using some= high level representation such as JSON), and only then worry about their e= fficient representation (e.g. BSON). Just a thought.

    Thomas

    On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang <qinwang@ber= keley.edu> wrote:
    Hi Kris,

    You are right= . Security Key should be a structured data, besides the key material, it sh= ould includes something like lifetime, KeyID, .....Correct?

    Many thanks!

    Qin


    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@b= erkeley.edu> wrote:
    =20 =20 =20
    is the security key a string?=A0 That doesn't seem right.

    ksjp


    On 8/19/2013 2:05 PM, Qin Wang wrote:
    Hi all,

    I separate a thread from thread "Message Flows", to = discuss the format for management messages, e.g. JSON, BSON, or others.

    As Thomas's suggestion, before delving into the representation of the information, we firstly identify what the contents of the different signaling packets are, and in addition, what the data structures they may use.=A0
    I would like to take the commands defined in=A0draft-wang-6tsch-6top-00 as starting point. Here are the parameters in those commands.

    //integer
    (1) xxxID, e.g. TrackID, SlotframeID
    (2) xxxOffset, e.g. SlotOffset
    (3) NumOfxxx/Length
    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0
    (5) Status
    (6) ASN (5Byte integer), e.g. last time when a packet received from a neighbor

    //string
    (7) L2 address
    (8) SecurityKey

    //bitmap
    (9) LinkOption

    //floating
    (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics

    Maybe something else........

    Now, we can evaluate different representation methods. What do you think?

    Thanks
    Qin


    =A0=A0


    ________________________________________=
_______
6tsch mailing list
6tsch@ietf.org
h=
ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
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    6tsch@ietf.org
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    --001a11c3f4a050fdc904e45ae1ac-- From xvilajosana@berkeley.edu Tue Aug 20 06:28:59 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 664EE11E81FF for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 06:28:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.716 X-Spam-Level: X-Spam-Status: No, score=-1.716 tagged_above=-999 required=5 tests=[AWL=-0.940, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_33=0.6, J_CHICKENPOX_44=0.6] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4vtQ6JNFA7pX for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 06:28:55 -0700 (PDT) Received: from mail-pd0-f169.google.com (mail-pd0-f169.google.com [209.85.192.169]) by ietfa.amsl.com (Postfix) with ESMTP id D585511E8170 for <6tsch@ietf.org>; Tue, 20 Aug 2013 06:28:54 -0700 (PDT) Received: by mail-pd0-f169.google.com with SMTP id r10so385144pdi.0 for <6tsch@ietf.org>; Tue, 20 Aug 2013 06:28:53 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=STbyB4Lg8b+YgjJJKNKnaLBdiTYvwFQW64hcWzpYhig=; b=hCyM3VBJxi9pobxX/oIHyT+KpEKW9plK9uaHyXwEvdVp2yYqkmq2xPnquGyxGYXCSo wyocBRaC6GeaLmEj2yjNbbIYaDQjH/Opk1KyoNyPRUWmTbp/MQJLYX1UJtTnF4jIWZ/a /ojzHjp7WhJSMnQAk1lhr3bWUjcNeFjiyuzYbUijvGTJO2Z7p9ZIpLsuDOP/c2jTIN0U bM6MdPSD1AqNlUqcDtABDrOCD52i5sB6j6Rjtf/TSG6k4V30XdPDGRFY4w5fIeERTWOJ 0lswfBMxu8OxUPg4JAPzKWNhINKt951UoelSvA+rFE8EJyscEFuy8hxwfvDH/kQj+tiP sFug== X-Gm-Message-State: ALoCoQlOqBC87B7h2Syf/YWuFoO9S0WuPFhXL+IAWSJ2spavCayw6AoXwJG3cRYduySJT1E23Mmz MIME-Version: 1.0 X-Received: by 10.68.36.132 with SMTP id q4mr1897165pbj.118.1377005333436; Tue, 20 Aug 2013 06:28:53 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Tue, 20 Aug 2013 06:28:53 -0700 (PDT) In-Reply-To: References: <52128ABD.3030800@berkeley.edu> Date: Tue, 20 Aug 2013 06:28:53 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Thomas Watteyne Content-Type: multipart/alternative; boundary=bcaec5216259c0f6c904e461093d Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Aug 2013 13:28:59 -0000 --bcaec5216259c0f6c904e461093d Content-Type: text/plain; charset=ISO-8859-1 Hi, one cent more to what Thomas says. IMHO, the most important thing is the content and secondary is the representation, at least at that time. So my feeling is that we need first to identify the content, and later express it json,bson or any other compressed format. One possible way to think on that is go in a two way approach, bottom up and top down, i.e someone needs to describe what the PCE,etc .. need, another can take the 6top commands and go up from there. From this two specifications we will be able to identify what is missing and how to match things. just thoughts. X On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne < watteyne@eecs.berkeley.edu> wrote: > Qin, > > Thanks for starting the thread! I have comment which my sound a bit vague, > but it's on purpose :) > > Do you envision that the flows will match the 6tos commands exactly? That > is, are you considering that the packets sent between different devices in > the network (PCE, motes, etc) contain the same commands as the 6top set of > commands from > http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4? > > Maybe we could by identifying the flows that we are considering, then the > contents of those packets (possibly described using some high level > representation such as JSON), and only then worry about their efficient > representation (e.g. BSON). Just a thought. > > Thomas > > On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote: > >> Hi Kris, >> >> You are right. Security Key should be a structured data, besides the key >> material, it should includes something like lifetime, KeyID, .....Correct? >> >> Many thanks! >> >> Qin >> >> >> On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote: >> >>> is the security key a string? That doesn't seem right. >>> >>> ksjp >>> >>> >>> On 8/19/2013 2:05 PM, Qin Wang wrote: >>> >>> Hi all, >>> >>> I separate a thread from thread "Message Flows", to discuss the format >>> for management messages, e.g. JSON, BSON, or others. >>> >>> As Thomas's suggestion, before delving into the representation of the >>> information, we firstly identify what the contents of the different >>> signaling packets are, and in addition, what the data structures they may >>> use. >>> >>> I would like to take the commands defined in draft-wang-6tsch-6top-00 >>> as starting point. Here are the parameters in those commands. >>> >>> //integer >>> (1) xxxID, e.g. TrackID, SlotframeID >>> (2) xxxOffset, e.g. SlotOffset >>> (3) NumOfxxx/Length >>> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority >>> (5) Status >>> (6) ASN (5Byte integer), e.g. last time when a packet received from a >>> neighbor >>> >>> //string >>> (7) L2 address >>> (8) SecurityKey >>> >>> //bitmap >>> (9) LinkOption >>> >>> //floating >>> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics >>> >>> Maybe something else........ >>> >>> Now, we can evaluate different representation methods. What do you >>> think? >>> >>> Thanks >>> Qin >>> >>> >>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list6tsch@ietf.orghttps://www.ietf.org/mailman/listinfo/6tsch >>> >>> >>> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --bcaec5216259c0f6c904e461093d Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi, one cent more to what Thomas says.

    = IMHO, the most important thing is the content and secondary is the represen= tation, at least at that time. So my feeling is that we need first to ident= ify the content, and later express it json,bson or any other compressed for= mat.

    One possible way to think on that is go in a two way ap= proach, bottom up and top down, i.e someone needs to describe what the PCE,= etc .. need, another can take the 6top commands and go up from there. From = this two specifications we will be able to identify what is missing and how= to match things.=A0

    just thoughts.
    X


    On Mon, Aug 19, 2013 at 11:07 = PM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wr= ote:
    Qin,

    Tha= nks for starting the thread! I have comment which my sound a bit vague, but= it's on purpose :)

    Do you envision that the flows will match the 6tos comm= ands exactly? That is, are you considering that the packets sent between di= fferent devices in the network (PCE, motes, etc) contain the same commands = as the 6top set of commands from=A0http://tools.ietf.org= /html/draft-wang-6tsch-6top-00#section-2.4?

    Maybe we could by identifying the flows that we are con= sidering, then the contents of those packets (possibly described using some= high level representation such as JSON), and only then worry about their e= fficient representation (e.g. BSON). Just a thought.

    Thomas

    On Mon, Aug 19, 2013 at= 3:54 PM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Kris,

    You are right= . Security Key should be a structured data, besides the key material, it sh= ould includes something like lifetime, KeyID, .....Correct?

    Many thanks!

    Qin


    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@b= erkeley.edu> wrote:
    =20 =20 =20
    is the security key a string?=A0 That doesn't seem right.

    ksjp


    On 8/19/2013 2:05 PM, Qin Wang wrote:
    Hi all,

    I separate a thread from thread "Message Flows", to = discuss the format for management messages, e.g. JSON, BSON, or others.

    As Thomas's suggestion, before delving into the representation of the information, we firstly identify what the contents of the different signaling packets are, and in addition, what the data structures they may use.=A0
    I would like to take the commands defined in=A0draft-wang-6tsch-6top-00 as starting point. Here are the parameters in those commands.

    //integer
    (1) xxxID, e.g. TrackID, SlotframeID
    (2) xxxOffset, e.g. SlotOffset
    (3) NumOfxxx/Length
    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0
    (5) Status
    (6) ASN (5Byte integer), e.g. last time when a packet received from a neighbor

    //string
    (7) L2 address
    (8) SecurityKey

    //bitmap
    (9) LinkOption

    //floating
    (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics

    Maybe something else........

    Now, we can evaluate different representation methods. What do you think?

    Thanks
    Qin


    =A0=A0


    ________________________________________=
_______
6tsch mailing list
6tsch@ietf.org
h=
ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --bcaec5216259c0f6c904e461093d-- From qinwang@berkeley.edu Tue Aug 20 06:39:25 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BD30A11E8100 for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 06:39:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.951 X-Spam-Level: X-Spam-Status: No, score=-2.951 tagged_above=-999 required=5 tests=[AWL=0.025, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id elNmnMBNHzim for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 06:39:21 -0700 (PDT) Received: from mail-vb0-f50.google.com (mail-vb0-f50.google.com [209.85.212.50]) by ietfa.amsl.com (Postfix) with ESMTP id 5481111E80D9 for <6tsch@ietf.org>; Tue, 20 Aug 2013 06:39:21 -0700 (PDT) Received: by mail-vb0-f50.google.com with SMTP id x14so238830vbb.23 for <6tsch@ietf.org>; Tue, 20 Aug 2013 06:39:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=Wed4aiv3hOCTK2yOIlZZyDm/jN6/wn/fW2SwdWTbUT0=; b=lx8a1xTOpkLgNEH3e8BgvnCED4yGcgXSJwFe9lVsou27YCD16mlAz15TCZtv7uETpx OwPvft5bhsrpB9cyiiKM6pwCJ5KbhHH3yUOfpZbQfg2KKXOz5nr1lqunbVHJx/r5wi6o RMAwqd2TrqHscuBzok41P8V+UkB0dewBcZOO6XmLU1pkGztZNvThPWrGiipaKRV+tbnn +cvyhfg/Kc0ocUNZfTqH4pGlOPqacuwRpRwSUfGARWIrxijzpg378x+GkeNtXO6QEpTA 9aY6T8xIr2WiuC+v1hV3wdIqvtCNVdKRSebK61JTwremV5peby83Bz2e/GQXr96QKUdV SMtg== X-Gm-Message-State: ALoCoQm9Martyx1IDo+5zlVj2AaAjkjALwOuI34WdqUxXOOociuS9jUsj6zaN4xmXKQQGW55hY5o MIME-Version: 1.0 X-Received: by 10.52.165.45 with SMTP id yv13mr1123310vdb.1.1377005956935; Tue, 20 Aug 2013 06:39:16 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Tue, 20 Aug 2013 06:39:16 -0700 (PDT) In-Reply-To: References: <52128ABD.3030800@berkeley.edu> Date: Tue, 20 Aug 2013 21:39:16 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=001a11c20802eac29f04e4612e9a Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Aug 2013 13:39:25 -0000 --001a11c20802eac29f04e4612e9a Content-Type: text/plain; charset=ISO-8859-1 Thomas, I agree with you. Let's identify the control flows first. Assume there is a management entity (ME) which may be exist in PCE (in centrilized case) or upper layer of mote (in distributed caes). The control flows discussed here are between ME and 6top of mote. Then, I think there are three kinds of flows as follows. (1) Action Flow. ME sends a action request (e.g. create/delete hardcell/update/softcell, create/delete/update slotframe) to 6top, 6top executes the action request, and then 6top responses confirmation message. (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics, read timesource) to 6top, 6top responses the corresponding information in the local MIB. (3) Report Flow. According to some criteria configured in mote (e.g. periodically), 6top reports the information in local MIB. From the 6top's commands point of view, it is a kind of query triggered by 6top of mote self. What do you think? Thanks Qin On Tue, Aug 20, 2013 at 2:07 PM, Thomas Watteyne wrote: > Qin, > > Thanks for starting the thread! I have comment which my sound a bit vague, > but it's on purpose :) > > Do you envision that the flows will match the 6tos commands exactly? That > is, are you considering that the packets sent between different devices in > the network (PCE, motes, etc) contain the same commands as the 6top set of > commands from > http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4? > > Maybe we could by identifying the flows that we are considering, then the > contents of those packets (possibly described using some high level > representation such as JSON), and only then worry about their efficient > representation (e.g. BSON). Just a thought. > > Thomas > > On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote: > >> Hi Kris, >> >> You are right. Security Key should be a structured data, besides the key >> material, it should includes something like lifetime, KeyID, .....Correct? >> >> Many thanks! >> >> Qin >> >> >> On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote: >> >>> is the security key a string? That doesn't seem right. >>> >>> ksjp >>> >>> >>> On 8/19/2013 2:05 PM, Qin Wang wrote: >>> >>> Hi all, >>> >>> I separate a thread from thread "Message Flows", to discuss the format >>> for management messages, e.g. JSON, BSON, or others. >>> >>> As Thomas's suggestion, before delving into the representation of the >>> information, we firstly identify what the contents of the different >>> signaling packets are, and in addition, what the data structures they may >>> use. >>> >>> I would like to take the commands defined in draft-wang-6tsch-6top-00 >>> as starting point. Here are the parameters in those commands. >>> >>> //integer >>> (1) xxxID, e.g. TrackID, SlotframeID >>> (2) xxxOffset, e.g. SlotOffset >>> (3) NumOfxxx/Length >>> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority >>> (5) Status >>> (6) ASN (5Byte integer), e.g. last time when a packet received from a >>> neighbor >>> >>> //string >>> (7) L2 address >>> (8) SecurityKey >>> >>> //bitmap >>> (9) LinkOption >>> >>> //floating >>> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics >>> >>> Maybe something else........ >>> >>> Now, we can evaluate different representation methods. What do you >>> think? >>> >>> Thanks >>> Qin >>> >>> >>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list6tsch@ietf.orghttps://www.ietf.org/mailman/listinfo/6tsch >>> >>> >>> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --001a11c20802eac29f04e4612e9a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Thomas,

    I agree with you. Let's identify = the control flows first.=A0

    Assume there is a mana= gement entity (ME) which may be exist in PCE (in centrilized case) or upper= layer of mote (in distributed caes). The control flows discussed here are = between ME and 6top of mote. Then, I think there are three kinds of flows a= s follows.

    (1) Action Flow. ME sends a action request (e.g. create= /delete hardcell/update/softcell, create/delete/update slotframe) to 6top, = 6top executes the action request, and then 6top responses confirmation mess= age.=A0
    (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics,= read timesource) to 6top, 6top responses the corresponding information in = the local MIB.
    (3) Report Flow. According to some criteria config= ured in mote (e.g. periodically), 6top reports the information in local MIB= . From the 6top's commands point of view, it is a kind of query trigger= ed by 6top of mote self.

    What do you think?

    Thanks
    Qin




    =





    On Tue, Aug 20, 2013 at 2:07 PM, Thomas = Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    Thanks for starting the thread! I = have comment which my sound a bit vague, but it's on purpose :)

    Do you envision that the flows will match the 6tos comman= ds exactly? That is, are you considering that the packets sent between diff= erent devices in the network (PCE, motes, etc) contain the same commands as= the 6top set of commands from=A0http://tools.ietf.org/h= tml/draft-wang-6tsch-6top-00#section-2.4?

    Maybe we could by identifying the flows that we are con= sidering, then the contents of those packets (possibly described using some= high level representation such as JSON), and only then worry about their e= fficient representation (e.g. BSON). Just a thought.

    Thomas

    On Mon, Aug 19, 2013 at= 3:54 PM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Kris,

    You are right= . Security Key should be a structured data, besides the key material, it sh= ould includes something like lifetime, KeyID, .....Correct?

    Many thanks!

    Qin


    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@b= erkeley.edu> wrote:
    =20 =20 =20
    is the security key a string?=A0 That doesn't seem right.

    ksjp


    On 8/19/2013 2:05 PM, Qin Wang wrote:
    Hi all,

    I separate a thread from thread "Message Flows", to = discuss the format for management messages, e.g. JSON, BSON, or others.

    As Thomas's suggestion, before delving into the representation of the information, we firstly identify what the contents of the different signaling packets are, and in addition, what the data structures they may use.=A0
    I would like to take the commands defined in=A0draft-wang-6tsch-6top-00 as starting point. Here are the parameters in those commands.

    //integer
    (1) xxxID, e.g. TrackID, SlotframeID
    (2) xxxOffset, e.g. SlotOffset
    (3) NumOfxxx/Length
    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0
    (5) Status
    (6) ASN (5Byte integer), e.g. last time when a packet received from a neighbor

    //string
    (7) L2 address
    (8) SecurityKey

    //bitmap
    (9) LinkOption

    //floating
    (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics

    Maybe something else........

    Now, we can evaluate different representation methods. What do you think?

    Thanks
    Qin


    =A0=A0


    ________________________________________=
_______
6tsch mailing list
6tsch@ietf.org
h=
ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --001a11c20802eac29f04e4612e9a-- From P.Zand@utwente.nl Tue Aug 20 12:53:45 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 63D0B11E812B for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 12:53:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.295 X-Spam-Level: X-Spam-Status: No, score=-0.295 tagged_above=-999 required=5 tests=[AWL=0.208, BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qa0UQBU0I9wy for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 12:53:36 -0700 (PDT) Received: from EXEDGE01.ad.utwente.nl (exedge01.ad.utwente.nl [130.89.5.48]) by ietfa.amsl.com (Postfix) with ESMTP id 0C6B011E814E for <6tsch@ietf.org>; Tue, 20 Aug 2013 12:53:34 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE01.ad.utwente.nl (130.89.5.48) with Microsoft SMTP Server (TLS) id 14.2.328.9; Tue, 20 Aug 2013 21:53:34 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Tue, 20 Aug 2013 21:53:32 +0200 From: To: , <6tsch@ietf.org> Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWD//+R/gIAAIcgA///iD4CAABkTAIADNlmggATgRgCAASNqIIAAqJmAgAEGRFA= Date: Tue, 20 Aug 2013 19:53:30 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309BEXMBX23adutwent_" MIME-Version: 1.0 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Aug 2013 19:53:45 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309BEXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thomas, Many thanks for your explanation. I couldn't find the related counter in MAC PIB of IEEE 802.15.4. My first idea was using both (a) clock accuracy information and (b) RPL ran= k information for choosing the best timing parent between two routers with = equal (or close) RPL rank. That would help us to avoid (1) synchronization = loop problem and (2) potential drifting problem caused by choosing the pare= nt, between two with equal ranks but not equal clock accuracy. As you mentioned, let's not make it complicated and consider the parent ran= k as a factor for choosing the timing parent. Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Tuesday, August 20, 2013 7:54 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Thanks for the explanation. Allow me to answer inline. Thomas On Mon, Aug 19, 2013 at 10:57 AM, > wrote: Thomas, I am not expert in synchronization, so please bear with me. By clock accuracy information, I mean how accurate a node can maintain (e.g= . =B11 ms) synchronization in the network for a period of time (e.g. 20 s) = without the need for clock update. Different devices might have different c= lock accuracy values represent by parts per million (ppm) unit. The clock a= ccuracy of a device might depend on the device' environment conditions (e.g= . temperature or shocks) and it doesn't just depend on crystals hardware. A= m I right? Agreed. I am used to the term "clock drift" for the phenomenon, but absolut= ely, drift depends on manufacturing, voltage, temperature, and probably oth= er environmental factors. The amount of drift of your clock source will dic= tate how often resynchronization needs to happen, given a guard time (i.e. = 1ms). Of course, all these parameters depend on each other, so you can imag= ine buying a better clock source, or changing the re-synchronization freque= ncy, or changing the guard time. In the centralized approach, the System/Network managers, use (L2) device = clock accuracy information as well as (L3) nodes' topology information (sim= ilar to node's rank in RPL in 6tsch distributed approach) to select the pot= ential clock sources in the network. Am I right? Hmm. I understand what you are proposing, but my first reaction is to be a = bit afraid that basing time source neighbor selection on clock drift inform= ation might lead to lots of complexity, for not much gain (I think). If I a= m drifting a lot wrt to my neighbor, could I not resolve that locally (thro= ugh all kind of techniques we can think of), rather than involving the time= source neighbor selection process in that? In a distributed approach, a network device might inform their neighbors a= bout its (L2) clock accuracy. A new device might use this information, as w= ell as L3 parameters (e.g. sender RPL' rank), to choose its timing parent. This would certainly invert the approach. Now, we let RPL select routing pa= rents, and then we have TSCH just use the same. If we go the other way arou= nd, i.e. select time source neighbors, then routes, many things will get co= mplicated real quick, the first of which are synchronization loops. If in 6tsch, we are considering the case that all the nodes in the network= have equal high clock accuracy, then let's consider (L3) router's rank, ba= sed on the default OF (as Raghuram suggest), as the only factor for selecti= ng timing parent. I would go that route, but maybe you have some counter example in mind? Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Monday, August 19, 2013 4:28 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, all, My 2c is the following. We already agreed on the fact that a mote's (RPL) r= outing parent would also be its (TSCH) time source neighbor. So why not pic= k the time source neighbor based on routing information? What exactly do you mean by clock accuracy? All nodes in a TSCH network nee= d to be able to synchronize with one another, and I don't think we are cons= idering cases where that is not true. Thomas On Thu, Aug 15, 2013 at 3:07 PM, > wrote: Raghuram, I agree with you that we need a method to pick a timing parent. We might need the L3 information on that, unless we can find a solution in = 6top to use L2 information. For example about the clock accuracy capabiliti= es of the device who has already joined the network. I am not sure if this = information is available in L2 and neighbor table. Best Wishes, Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Wednesday, August 14, 2013 12:57 AM To: xvilajosana@eecs.berkeley.edu; Za= nd, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang Subject: Re: [6tsch] RPL on Basic Xavi, Pouria, I think we need to keep node rank at 6top (as a read only parameter obtaine= d from L3) in order for the TSCH nodes to figure out the timing parent. In = the case where RPL node may have different ranks based on different OFs we = need a method to pick a timing parent. We should propose a default OF, that is used to compute the ranks for the p= urpose finding the timing parent. -raghuram From: Xavier Vilajosana Guillen > Reply-To: > Date: Tuesday, August 13, 2013 2:27 PM To: Pouria Zand > Cc: Thomas Watteyne >, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang = > Subject: Re: [6tsch] RPL on Basic Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, > wrote: Xavi, I guess we cannot keep "node rank" in the 6top. Because a node might have d= ifferent rank based on different metrics defined in L3. As a response, I do= n't think we can get all of those information form L3 and use them in neigh= bor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309BEXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Thomas,=

     <= /p>

    Many thanks for your expl= anation.

    I couldn’t find the= related counter in MAC PIB of IEEE 802.15.4.

     <= /p>

    My first idea was using b= oth (a) clock accuracy information and (b) RPL rank information for choosin= g the best timing parent between two routers with equal (or close) RPL rank. That would help us to avoid (1) synchronization loop = problem and (2) potential drifting problem caused by choosing the parent, b= etween two with equal ranks but not equal clock accuracy.=

     <= /p>

    As you mentioned, letR= 17;s not make it complicated and consider the parent rank as a factor for c= hoosing the timing parent.

     <= /p>

    Pouria.=

        &= nbsp;  

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM
    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Thanks for the explanation. Allow me to answer inlin= e.

    Thomas

     

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    I am not expert in synchronization, so = please bear with me.

     

    By clock accuracy information, I mean h= ow accurate a node can maintain (e.g. =B11 ms) synchronization in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device’ environment conditions (e.g. temperature or shocks) and it doesn’t just depend o= n crystals hardware. Am I right?

     

    Agreed. I am used to the term "clock drift"= ; for the phenomenon, but absolutely, drift depends on manufacturing, volta= ge, temperature, and probably other environmental factors. The amount of dr= ift of your clock source will dictate how often resynchronization needs to happen, given a guard time (i.e. 1ms). Of cours= e, all these parameters depend on each other, so you can imagine buying a b= etter clock source, or changing the re-synchronization frequency, or changi= ng the guard time.

     

     In the centralized approach, the = System/Network managers, use (L2) device clock accuracy information as well as (L3) nodes’ topology information (similar to node’s= rank in RPL in 6tsch distributed approach) to select the potential clock s= ources in the network. Am I right? 

     

    Hmm. I understand what you are proposing, but my fir= st reaction is to be a bit afraid that basing time source neighbor selectio= n on clock drift information might lead to lots of complexity, for not much= gain (I think). If I am drifting a lot wrt to my neighbor, could I not resolve that locally (through all ki= nd of techniques we can think of), rather than involving the time source ne= ighbor selection process in that?

     

     In a distributed approach, a netw= ork device might inform their neighbors about its (L2) clock accuracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL’ rank), to choose its timing parent.

     

    This would certainly invert the approach. Now, we le= t RPL select routing parents, and then we have TSCH just use the same. If w= e go the other way around, i.e. select time source neighbors, then routes, = many things will get complicated real quick, the first of which are synchronization loops.

     

     If in 6tsch, we are considering t= he case that all the nodes in the network have equal high clock accuracy, then let’s consider (L3) router’s rank, based on the= default OF (as Raghuram suggest), as the only factor for selecting = timing parent.

     

    I would go that route, but maybe you have some count= er example in mind?

     

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

     

    Pouria, all,

     

    My 2c is the following. We already agreed on the fact that a mote'= s (RPL) routing parent would also be its (TSCH) time source neighbor. So wh= y not pick the time source neighbor based on routing information?

     

    What exactly do you mean by clock accuracy? All nodes in a TSCH ne= twork need to be able to synchronize with one another, and I don't think we= are considering cases where that is not true.

     

    Thomas

     

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:

    Raghuram,

    I agree with you that we need a method to pick a timi= ng parent.

    We might need the L3 information on that, unless we c= an find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

     

    From: Raghuram Sudhaakar (rs= udhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

     

    Xavi, Pouria,

    I think we need to keep node rank at 6top (as a read = only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

     

    We should propose a default OF, that is used to compu= te the ranks for the purpose finding the timing parent.

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

     

    Good point :-)

    agreed!
    X

     

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    I guess we cannot keep “node rank= ” in the 6top. Because a node might have different rank based on different metrics defined in L3. As a response, I don’t think we can= get all of those information form L3 and use them in neighbor table in 6to= p. Am I right?

    I think, as you mentioned we need to wo= rk on them.

     

    Pouria  

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Many thanks for your complete explanati= on. It absolutely makes sense.

     

    Just one minor question. The neighbor t= able will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?

    there are many different ways to implement that, this is an= option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about connect= ivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your description. Besides, there isn't a c= ommon shared cell to send KAs. I see the operation in the following way:

    6top KA timer expires and places a KA packet into the queue (e.g this ha= ppens every 30s). TSCH layer at the begining of a shared tx/rx slot then re= ads from the queue and sends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation us= ing Neighbors information described in Basic configuration.

        -this includes how = OF is calculated using numTx and numTxACK, etc..

     

    []

    -RPL configuration:<= /p>

         - storing mod= e vs non-storing mode (I vote for non-storing mode for a basic configuratio= n)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


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    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309BEXMBX23adutwent_-- From twatteyne@gmail.com Tue Aug 20 22:45:48 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 475AC11E8376 for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 22:45:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.894 X-Spam-Level: X-Spam-Status: No, score=-1.894 tagged_above=-999 required=5 tests=[AWL=0.083, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id T3Jf38uvHGBJ for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 22:45:46 -0700 (PDT) Received: from mail-pa0-x232.google.com (mail-pa0-x232.google.com [IPv6:2607:f8b0:400e:c03::232]) by ietfa.amsl.com (Postfix) with ESMTP id C961411E8373 for <6tsch@ietf.org>; Tue, 20 Aug 2013 22:45:44 -0700 (PDT) Received: by mail-pa0-f50.google.com with SMTP id fb10so421510pad.9 for <6tsch@ietf.org>; Tue, 20 Aug 2013 22:45:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=tnKlMwBpLepRM95fdZz02xRHVWAMzeh9Iz1RSsMP9LA=; b=nxO2zRuefytDrUC1yCIsIO0EnpAWXB9o886viXmdHn6tUYtiaDlegS137B4H5O9Gmn sahi4ikfI4+wJEfCSX8YNWile7ilFlOfXkCqROYDzkQaKRcTJat+cVjIwHOIcDpnpicv 810iQypdIvNnVnZH7doQYqc1M7sCCn9/Le5xcrLNxeZFJmfmg3bmEOvqaWMDK6YjzfAd zgLxyVeEUmTFX1XwXGLpftlFQG6cIWLHmeYvk/YLCbVeW0CAAKhpiOUXODrx0zCBBVZE OIa+7XrwewmoJkqUf3SLznEy+og2lIctSb13ai5u2MNEwUqIpbrRc2wAB1cPZGBOKaTH SGTw== X-Received: by 10.66.156.199 with SMTP id wg7mr7670273pab.81.1377063940133; Tue, 20 Aug 2013 22:45:40 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 20 Aug 2013 22:45:18 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> From: Thomas Watteyne Date: Tue, 20 Aug 2013 22:45:18 -0700 X-Google-Sender-Auth: hZzuTaCk4RsoWVS6o_NXSXcP8fA Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b86c748fc1b5e04e46eae8d Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Aug 2013 05:45:48 -0000 --047d7b86c748fc1b5e04e46eae8d Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Pouria, Glad to read we agree! Thomas On Tue, Aug 20, 2013 at 12:53 PM, wrote: > Thomas,**** > > ** ** > > Many thanks for your explanation.**** > > **** > > I couldn=92t find the related counter in MAC PIB of IEEE 802.15.4.**** > > ** ** > > My first idea was using both (a) clock accuracy information and (b) RPL > rank information for choosing the best timing parent between two routers > with equal (or close) RPL rank. That would help us to avoid (1) > synchronization loop problem and (2) potential drifting problem caused by > choosing the parent, between two with equal ranks but not equal clock > accuracy.**** > > ** ** > > As you mentioned, let=92s not make it complicated and consider the parent > rank as a factor for choosing the timing parent.**** > > ** ** > > Pouria.**** > > **** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Tuesday, August 20, 2013 7:54 AM > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Pouria,**** > > Thanks for the explanation. Allow me to answer inline.**** > > Thomas**** > > ** ** > > On Mon, Aug 19, 2013 at 10:57 AM, wrote:**** > > Thomas,**** > > **** > > I am not expert in synchronization, so please bear with me.**** > > **** > > By clock accuracy information, I mean how accurate a node can maintain > (e.g. =B11 ms) synchronization in the network for a period of time (e.g. = 20 > s) without the need for clock update. Different devices might have > different clock accuracy values represent by parts per million (ppm) unit= . > The clock accuracy of a device might depend on the device=92 environment > conditions (e.g. temperature or shocks) and it doesn=92t just depend on > crystals hardware. Am I right?**** > > ** ** > > Agreed. I am used to the term "clock drift" for the phenomenon, but > absolutely, drift depends on manufacturing, voltage, temperature, and > probably other environmental factors. The amount of drift of your clock > source will dictate how often resynchronization needs to happen, given a > guard time (i.e. 1ms). Of course, all these parameters depend on each > other, so you can imagine buying a better clock source, or changing the > re-synchronization frequency, or changing the guard time.**** > > ** ** > > In the centralized approach, the System/Network managers, use (L2) > device clock accuracy information as well as (L3) nodes=92 topology > information (similar to node=92s rank in RPL in 6tsch distributed approac= h) > to select the potential clock sources in the network. Am I right? **** > > ** ** > > Hmm. I understand what you are proposing, but my first reaction is to be = a > bit afraid that basing time source neighbor selection on clock drift > information might lead to lots of complexity, for not much gain (I think)= . > If I am drifting a lot wrt to my neighbor, could I not resolve that local= ly > (through all kind of techniques we can think of), rather than involving t= he > time source neighbor selection process in that?**** > > **** > > In a distributed approach, a network device might inform their > neighbors about its (L2) clock accuracy. A new device might use this > information, as well as L3 parameters (e.g. sender RPL=92 rank), to choos= e > its timing parent.**** > > ** ** > > This would certainly invert the approach. Now, we let RPL select routing > parents, and then we have TSCH just use the same. If we go the other way > around, i.e. select time source neighbors, then routes, many things will > get complicated real quick, the first of which are synchronization loops.= * > *** > > **** > > If in 6tsch, we are considering the case that all the nodes in the > network have equal high clock accuracy, then let=92s consider (L3) router= =92s > rank, based on the *default OF* (as Raghuram suggest), as the only factor > for selecting timing parent.**** > > **** > > I would go that route, but maybe you have some counter example in mind?*= * > ** > > **** > > Pouria**** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Monday, August 19, 2013 4:28 AM > *To:* 6TSCH**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria, all,**** > > **** > > My 2c is the following. We already agreed on the fact that a mote's (RPL) > routing parent would also be its (TSCH) time source neighbor. So why not > pick the time source neighbor based on routing information?**** > > **** > > What exactly do you mean by clock accuracy? All nodes in a TSCH network > need to be able to synchronize with one another, and I don't think we are > considering cases where that is not true.**** > > **** > > Thomas**** > > **** > > On Thu, Aug 15, 2013 at 3:07 PM, wrote:**** > > Raghuram,**** > > I agree with you that we need a method to pick a timing parent.**** > > We might need the L3 information on that, unless we can find a solution i= n > 6top to use L2 information. For example about the clock accuracy > capabilities of the device who has already joined the network. I am not > sure if this information is available in L2 and neighbor table.**** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] > *Sent:* Wednesday, August 14, 2013 12:57 AM > *To:* xvilajosana@eecs.berkeley.edu; Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org; Qin Wang**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Xavi, Pouria,**** > > I think we need to keep node rank at 6top (as a read only parameter > obtained from L3) in order for the TSCH nodes to figure out the timing > parent. In the case where RPL node may have different ranks based on > different OFs we need a method to pick a timing parent.**** > > **** > > We should propose a default OF, that is used to compute the ranks for the > purpose finding the timing parent.**** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: * > *Date: *Tuesday, August 13, 2013 2:27 PM > *To: *Pouria Zand > *Cc: *Thomas Watteyne , "6tsch@ietf.org" < > 6tsch@ietf.org>, Qin Wang > *Subject: *Re: [6tsch] RPL on Basic**** > > **** > > Good point :-)**** > > agreed! > X**** > > **** > > On Tue, Aug 13, 2013 at 2:20 PM, wrote:**** > > Xavi,**** > > **** > > I guess we cannot keep =93node rank=94 in the 6top. Because a node might = have > different rank based on different metrics defined in L3. As a response, I > don=92t think we can get all of those information form L3 and use them in > neighbor table in 6top. Am I right? **** > > I think, as you mentioned we need to work on them. **** > > **** > > Pouria **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 11:13 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria, > > yes the neighbor table is something that 6top takes care of. The fields o= f > the table is something that we need to work on, stats for sure as describ= ed > by the basic configuration draft. As regards to the rank, in our > implementation, we keep it in the table, for each neighbour we keep its > rank. This information can be placed somewhere else if you want but I gue= ss > we need it to keep some sense on what is the rank of our neighbors.**** > > regards,**** > > Xavi**** > > **** > > **** > > On Tue, Aug 13, 2013 at 2:05 PM, wrote:**** > > Xavi,**** > > **** > > Many thanks for your complete explanation. It absolutely makes sense.**** > > **** > > Just one minor question. The neighbor table will be stored in 6top. Am I > right? If yes, do we need to store rank information (included in DIO) in > that table? Or we just store neighbor statistic?**** > > **** > > Pouria **** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 10:17 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > answer inline:**** > > Xavi,**** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > there are many different ways to implement that, this is an option.**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI?**** > > These are the list of known neighbors with acceptable RSSI, so yes if it > wants to keep all of them.**** > > Or (2) the node should probe its connection with the its RPL parent and > its RPL child? In the case (2), how does the 6top can inform the L3 about > the new potential discovered neighbors and their connection status? **** > > When a node is discovered due to receiving and EB (at least in our openws= n > implementation), it is inserted at the neighbor table. At that point no > information about connectivity can be used except RSSI. As soon as a DIO = is > received from that node, its information is updated (including rank). As = we > don't have any information about connectivity (as RFC6552 describes) an > initial value is set (i.e rank + FOO). In openwsn a similar case to (1) i= s > used so eventually some stats of the link can be used to compute the ETX > and let RPL do its work. **** > > So RPL knows about a new node because 6TOP keeps information of neighbors > an eventually this information is used by RPL to update routes. As this > node sends DIOs and receives DIOs from others the information is > permanently being updated enabling a node to be positioned in the multiho= p > topology.**** > > Does it make sense?**** > > Pouria**** > > **** > > On Tue, Aug 13, 2013 at 12:40 PM, wrote:**** > > Xavi,**** > > **** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > **** > > Pouria**** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > **** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:*6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > **** > > **** > > ** ** > --047d7b86c748fc1b5e04e46eae8d Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Pouria,
    Glad to read we agree!
    Thomas
    <= /div>


    On Tue, = Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,

    =A0<= /p>

    Many thanks for your expl= anation.

    I couldn=92t find the rel= ated counter in MAC PIB of IEEE 802.15.4.

    =A0<= /p>

    My first idea was using b= oth (a) clock accuracy information and (b) RPL rank information for choosin= g the best timing parent between two routers with equal (or close) RPL rank. That would help us to avoid (1) synchronization loop = problem and (2) potential drifting problem caused by choosing the parent, b= etween two with equal ranks but not equal clock accuracy.

    =A0<= /p>

    As you mentioned, let=92s= not make it complicated and consider the parent rank as a factor for choos= ing the timing parent.

    =A0<= /p>

    Pouria.

    =A0=A0=A0=A0=A0=A0=A0<= /u>

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    Thanks for the explanation. Allow me to answer inlin= e.

    Thomas

    =A0

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,<= /u>

    =A0<= /p>

    I am not expert in synchr= onization, so please bear with me.

    =A0<= /p>

    By clock accuracy informa= tion, I mean how accurate a node can maintain (e.g. =B11 ms) synchronizatio= n in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device=92 environment conditions (e.g. temperature or shocks) and it doesn=92t just depend on cr= ystals hardware. Am I right?

    =A0

    Agreed. I am used to the term "clock drift"= ; for the phenomenon, but absolutely, drift depends on manufacturing, volta= ge, temperature, and probably other environmental factors. The amount of dr= ift of your clock source will dictate how often resynchronization needs to happen, given a guard time (i.e. 1ms). Of cours= e, all these parameters depend on each other, so you can imagine buying a b= etter clock source, or changing the re-synchronization frequency, or changi= ng the guard time.

    =A0

    =A0In the centralized app= roach, the System/Network managers, use (L2) device clock accuracy informat= ion as well as (L3) nodes=92 topology information (similar to node=92s rank in= RPL in 6tsch distributed approach) to select the potential clock sources i= n the network. Am I right?=A0

    =A0

    Hmm. I understand what you are proposing, but my fir= st reaction is to be a bit afraid that basing time source neighbor selectio= n on clock drift information might lead to lots of complexity, for not much= gain (I think). If I am drifting a lot wrt to my neighbor, could I not resolve that locally (through all ki= nd of techniques we can think of), rather than involving the time source ne= ighbor selection process in that?

    =A0

    =A0In a distributed appro= ach, a network device might inform their neighbors about its (L2) clock acc= uracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL=92 rank), to choose its timing parent.

    =A0

    This would certainly invert the approach. Now, we le= t RPL select routing parents, and then we have TSCH just use the same. If w= e go the other way around, i.e. select time source neighbors, then routes, = many things will get complicated real quick, the first of which are synchronization loops.

    =A0

    =A0If in 6tsch, we are co= nsidering the case that all the nodes in the network have equal high clock accuracy, then let=92s consider (L3) router=92s rank, based on the defa= ult OF (as Raghuram suggest), as the only factor for selecting timing p= arent.

    =A0<= /p>

    I would go that route, but maybe you have some count= er example in mind?

    =A0

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria, all,

    =A0

    My 2c is the following. We already agreed on the fac= t that a mote's (RPL) routing parent would also be its (TSCH) time sour= ce neighbor. So why not pick the time source neighbor based on routing information?

    =A0

    What exactly do you mean by clock accuracy? All node= s in a TSCH network need to be able to synchronize with one another, and I = don't think we are considering cases where that is not true.

    =A0

    Thomas

    =A0

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:=

    Raghuram,

    I agree with you that we need a method = to pick a timing parent.

    We might need the L3 information on tha= t, unless we can find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Raghuram= Sudhaakar (rsudhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Xavi, Pouria,

    I think we need to keep node rank at 6t= op (as a read only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

    =A0

    We should propose a default OF, that is= used to compute the ranks for the purpose finding the timing parent.

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Good poi= nt :-)

    agreed!
    X

    =A0

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl&= gt; wrote:

    Xavi,

    =A0<= /p>

    I guess we cannot keep = =93node rank=94 in the 6top. Because a node might have different rank based= on different metrics defined in L3. As a response, I don=92t think we can get= all of those information form L3 and use them in neighbor table in 6top. A= m I right?

    I think, as you mentioned= we need to work on them.

    =A0<= /p>

    Pouria =A0<= u>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

    =A0

    =A0

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:=

    Xavi,

    =A0<= /p>

    Many thanks for your comp= lete explanation. It absolutely makes sense.

    =A0<= /p>

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    answer inline:=

    Xavi,

    Keep Alive timer expires for =93node A=94 aft= er 30s if no frames have been sent (or received) to (or from) neighbor =93n= ode B=94. Am I right?

    there are many different ways to implement that, this is an= option.

    =A0

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about con= nectivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

    =A0

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or from) neighbor =93node B=94. Am I right?

    =A0<= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status? =A0=A0=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the= following way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.=

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From:6tsch-bounces@ietf.org= [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchron= ized with its RPL parent. In the absence of traffic, the node will periodic= ally "keep alive" (per Xavi's e-mail) to the parent. How ofte= n depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:<= u>

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function = calculation using Neighbors information described in Basic configuration.

    =A0=A0=A0 -this includes= how OF is calculated using numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing m= ode vs non-storing mode (I vote for non-storing mode for a basic configurat= ion)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0


    --047d7b86c748fc1b5e04e46eae8d-- From twatteyne@gmail.com Tue Aug 20 22:46:55 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0420A11E8373 for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 22:46:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[AWL=0.076, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4vGEkf6CHR1e for <6tsch@ietfa.amsl.com>; Tue, 20 Aug 2013 22:46:51 -0700 (PDT) Received: from mail-pa0-x236.google.com (mail-pa0-x236.google.com [IPv6:2607:f8b0:400e:c03::236]) by ietfa.amsl.com (Postfix) with ESMTP id 1855311E81B2 for <6tsch@ietf.org>; Tue, 20 Aug 2013 22:46:42 -0700 (PDT) Received: by mail-pa0-f54.google.com with SMTP id kx10so414315pab.41 for <6tsch@ietf.org>; Tue, 20 Aug 2013 22:46:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=vIeJbFhb6V5QzVsAO24zooTYJRQyU5l+4aApYkW+y6c=; b=gj8jiOosMKqjpkkuMc6mNMPLDKR1eP1XldUaYHIhGRLHERQapHn3cba8PQ05x1KW/h ekuy3RaKya4VIo0v8ti50/sM923tIL5Ba+kBHIi3bvKmwl2TSdFXtq3OvsOXrlFwj0+3 SCxdw9nPzLqfsb+NTXjRuRIGG8onjQRW6TnHfd0y92RG3pJMlzOuBqGCyoOjHx4wuQcs WGfDy3IyuIYMW7hi8ONk0Ed1OgfJ6pRuzE0T4x5qn7H+0eVmzXnL1i5JiiqwUNZRI7g2 GWuI4KBDB0vx5RkogTe9Av9qCIurfK48fVsJFEruncDT5XkCdY4e4BwibSbdskidwccy Ve/Q== X-Received: by 10.68.162.97 with SMTP id xz1mr5880908pbb.166.1377064001059; Tue, 20 Aug 2013 22:46:41 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 20 Aug 2013 22:46:20 -0700 (PDT) In-Reply-To: References: <52128ABD.3030800@berkeley.edu> From: Thomas Watteyne Date: Tue, 20 Aug 2013 22:46:20 -0700 X-Google-Sender-Auth: NkQNc-ZMKMgmwL_CFoeRmKaIGbo Message-ID: To: Qin Wang Content-Type: multipart/alternative; boundary=047d7bacb84a9dc34904e46eb267 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Aug 2013 05:46:55 -0000 --047d7bacb84a9dc34904e46eb267 Content-Type: text/plain; charset=ISO-8859-1 Qin, I totally agree with these flows. Thomas On Tue, Aug 20, 2013 at 6:39 AM, Qin Wang wrote: > Thomas, > > I agree with you. Let's identify the control flows first. > > Assume there is a management entity (ME) which may be exist in PCE (in > centrilized case) or upper layer of mote (in distributed caes). The control > flows discussed here are between ME and 6top of mote. Then, I think there > are three kinds of flows as follows. > > (1) Action Flow. ME sends a action request (e.g. create/delete > hardcell/update/softcell, create/delete/update slotframe) to 6top, 6top > executes the action request, and then 6top responses confirmation message. > (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics, > read timesource) to 6top, 6top responses the corresponding information in > the local MIB. > (3) Report Flow. According to some criteria configured in mote (e.g. > periodically), 6top reports the information in local MIB. From the 6top's > commands point of view, it is a kind of query triggered by 6top of mote > self. > > What do you think? > > Thanks > Qin > > > > > > > > > > On Tue, Aug 20, 2013 at 2:07 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote: > >> Qin, >> >> Thanks for starting the thread! I have comment which my sound a bit >> vague, but it's on purpose :) >> >> Do you envision that the flows will match the 6tos commands exactly? That >> is, are you considering that the packets sent between different devices in >> the network (PCE, motes, etc) contain the same commands as the 6top set of >> commands from >> http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4? >> >> Maybe we could by identifying the flows that we are considering, then the >> contents of those packets (possibly described using some high level >> representation such as JSON), and only then worry about their efficient >> representation (e.g. BSON). Just a thought. >> >> Thomas >> >> On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote: >> >>> Hi Kris, >>> >>> You are right. Security Key should be a structured data, besides the key >>> material, it should includes something like lifetime, KeyID, .....Correct? >>> >>> Many thanks! >>> >>> Qin >>> >>> >>> On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote: >>> >>>> is the security key a string? That doesn't seem right. >>>> >>>> ksjp >>>> >>>> >>>> On 8/19/2013 2:05 PM, Qin Wang wrote: >>>> >>>> Hi all, >>>> >>>> I separate a thread from thread "Message Flows", to discuss the >>>> format for management messages, e.g. JSON, BSON, or others. >>>> >>>> As Thomas's suggestion, before delving into the representation of the >>>> information, we firstly identify what the contents of the different >>>> signaling packets are, and in addition, what the data structures they may >>>> use. >>>> >>>> I would like to take the commands defined in draft-wang-6tsch-6top-00 >>>> as starting point. Here are the parameters in those commands. >>>> >>>> //integer >>>> (1) xxxID, e.g. TrackID, SlotframeID >>>> (2) xxxOffset, e.g. SlotOffset >>>> (3) NumOfxxx/Length >>>> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority >>>> (5) Status >>>> (6) ASN (5Byte integer), e.g. last time when a packet received from a >>>> neighbor >>>> >>>> //string >>>> (7) L2 address >>>> (8) SecurityKey >>>> >>>> //bitmap >>>> (9) LinkOption >>>> >>>> //floating >>>> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics >>>> >>>> Maybe something else........ >>>> >>>> Now, we can evaluate different representation methods. What do you >>>> think? >>>> >>>> Thanks >>>> Qin >>>> >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list6tsch@ietf.orghttps://www.ietf.org/mailman/listinfo/6tsch >>>> >>>> >>>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > --047d7bacb84a9dc34904e46eb267 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Qin,
    I totally agree with these flows.
    Thoma= s


    = On Tue, Aug 20, 2013 at 6:39 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    Thomas,

    I agre= e with you. Let's identify the control flows first.=A0

    Assume there is a management entity (ME) which may be exist in PCE (in= centrilized case) or upper layer of mote (in distributed caes). The contro= l flows discussed here are between ME and 6top of mote. Then, I think there= are three kinds of flows as follows.

    (1) Action Flow. ME sends a action request (e.g. create= /delete hardcell/update/softcell, create/delete/update slotframe) to 6top, = 6top executes the action request, and then 6top responses confirmation mess= age.=A0
    (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics,= read timesource) to 6top, 6top responses the corresponding information in = the local MIB.
    (3) Report Flow. According to some criteria config= ured in mote (e.g. periodically), 6top reports the information in local MIB= . From the 6top's commands point of view, it is a kind of query trigger= ed by 6top of mote self.

    What do you think?

    Thanks
    Qin




    =





    On Tue, Aug 20, 2013 at 2:07 PM, Thomas = Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    Thanks for starting the thread! I = have comment which my sound a bit vague, but it's on purpose :)

    Do you envision that the flows will match the 6tos comman= ds exactly? That is, are you considering that the packets sent between diff= erent devices in the network (PCE, motes, etc) contain the same commands as= the 6top set of commands from=A0http://tools.ietf.org/h= tml/draft-wang-6tsch-6top-00#section-2.4?

    Maybe we could by identifying the flows that we are con= sidering, then the contents of those packets (possibly described using some= high level representation such as JSON), and only then worry about their e= fficient representation (e.g. BSON). Just a thought.

    Thomas

    On Mon, Aug 19, 2013 at 3:54 PM, Qin= Wang <qinwang@berkeley.edu> wrote:
    Hi Kris,

    You are right= . Security Key should be a structured data, besides the key material, it sh= ould includes something like lifetime, KeyID, .....Correct?

    Many thanks!

    Qin


    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@b= erkeley.edu> wrote:
    =20 =20 =20
    is the security key a string?=A0 That doesn't seem right.

    ksjp


    On 8/19/2013 2:05 PM, Qin Wang wrote:
    Hi all,

    I separate a thread from thread "Message Flows", to = discuss the format for management messages, e.g. JSON, BSON, or others.

    As Thomas's suggestion, before delving into the representation of the information, we firstly identify what the contents of the different signaling packets are, and in addition, what the data structures they may use.=A0
    I would like to take the commands defined in=A0draft-wang-6tsch-6top-00 as starting point. Here are the parameters in those commands.

    //integer
    (1) xxxID, e.g. TrackID, SlotframeID
    (2) xxxOffset, e.g. SlotOffset
    (3) NumOfxxx/Length
    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0
    (5) Status
    (6) ASN (5Byte integer), e.g. last time when a packet received from a neighbor

    //string
    (7) L2 address
    (8) SecurityKey

    //bitmap
    (9) LinkOption

    //floating
    (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics

    Maybe something else........

    Now, we can evaluate different representation methods. What do you think?

    Thanks
    Qin


    =A0=A0


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    --047d7bacb84a9dc34904e46eb267-- From qinwang@berkeley.edu Wed Aug 21 10:41:13 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3681911E83B4 for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 10:41:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.953 X-Spam-Level: X-Spam-Status: No, score=-2.953 tagged_above=-999 required=5 tests=[AWL=0.023, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QXhJGetyq5yH for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 10:41:09 -0700 (PDT) Received: from mail-vc0-f181.google.com (mail-vc0-f181.google.com [209.85.220.181]) by ietfa.amsl.com (Postfix) with ESMTP id 618BF11E8257 for <6tsch@ietf.org>; Wed, 21 Aug 2013 10:41:08 -0700 (PDT) Received: by mail-vc0-f181.google.com with SMTP id hz10so464369vcb.40 for <6tsch@ietf.org>; Wed, 21 Aug 2013 10:41:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=4U2JaPRu359qiRUXsXUHgnCJAKD/Gzp4I2zb5LhamBA=; b=gUSJ0nDEKCu+8bfN+My2p321CzZrbTp5tT/eLdvYRDiY2AdpcJo8d74q5YL9h3YYBR t4M0egn2uc3+sqg3HwiDQB47l9DD4GM9y/kOkeh0kPqdcECaDdH381sdp9BEniKKK/// ZJ1vENDrFzygBSCUPyg+XjV3LObu1276G1FJrNGuizKMBjgSeIoocfZBzlJUk9ojDSWj DAa1tN66QFlQFmXGlVafOHUvTdmWc170i7zu8W7Ki9IwsyTa2IO6o3k1Km18h1rP9G5S tEVrudh6tPQhn1D9NeG/lIhvBbs7f+BzkeeCF7olZHnZgxOIes003YMJ9FyGjC8NiISa lsdQ== X-Gm-Message-State: ALoCoQkVTP5J226g2U+gaZxBtu+jpmk8b9K5jaBpLpX410Op6/9kI2C6f2MhdwWS04ix9FuXXnTt MIME-Version: 1.0 X-Received: by 10.52.35.98 with SMTP id g2mr6286929vdj.0.1377106866480; Wed, 21 Aug 2013 10:41:06 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Wed, 21 Aug 2013 10:41:06 -0700 (PDT) In-Reply-To: References: <52128ABD.3030800@berkeley.edu> Date: Thu, 22 Aug 2013 01:41:06 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/mixed; boundary=20cf307f3bfa983b1204e478ad44 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Aug 2013 17:41:13 -0000 --20cf307f3bfa983b1204e478ad44 Content-Type: multipart/alternative; boundary=20cf307f3bfa983b0f04e478ad42 --20cf307f3bfa983b0f04e478ad42 Content-Type: text/plain; charset=ISO-8859-1 Hi Thomas, Xavi and all, I went through the 6top commands defined in http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4 and put them into the three control flows. See the attached file. As Xavi suggested, it is bottom-up approach, thus, leaving lots of TODOs to top-down approach. It is just start point. Any comments and suggestions are welcome. Qin On Wed, Aug 21, 2013 at 1:46 PM, Thomas Watteyne wrote: > Qin, > I totally agree with these flows. > Thomas > > > On Tue, Aug 20, 2013 at 6:39 AM, Qin Wang wrote: > >> Thomas, >> >> I agree with you. Let's identify the control flows first. >> >> Assume there is a management entity (ME) which may be exist in PCE (in >> centrilized case) or upper layer of mote (in distributed caes). The control >> flows discussed here are between ME and 6top of mote. Then, I think there >> are three kinds of flows as follows. >> >> (1) Action Flow. ME sends a action request (e.g. create/delete >> hardcell/update/softcell, create/delete/update slotframe) to 6top, 6top >> executes the action request, and then 6top responses confirmation message. >> (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics, >> read timesource) to 6top, 6top responses the corresponding information in >> the local MIB. >> (3) Report Flow. According to some criteria configured in mote (e.g. >> periodically), 6top reports the information in local MIB. From the 6top's >> commands point of view, it is a kind of query triggered by 6top of mote >> self. >> >> What do you think? >> >> Thanks >> Qin >> >> >> >> >> >> >> >> >> >> On Tue, Aug 20, 2013 at 2:07 PM, Thomas Watteyne < >> watteyne@eecs.berkeley.edu> wrote: >> >>> Qin, >>> >>> Thanks for starting the thread! I have comment which my sound a bit >>> vague, but it's on purpose :) >>> >>> Do you envision that the flows will match the 6tos commands exactly? >>> That is, are you considering that the packets sent between different >>> devices in the network (PCE, motes, etc) contain the same commands as the >>> 6top set of commands from >>> http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4? >>> >>> Maybe we could by identifying the flows that we are considering, then >>> the contents of those packets (possibly described using some high level >>> representation such as JSON), and only then worry about their efficient >>> representation (e.g. BSON). Just a thought. >>> >>> Thomas >>> >>> On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote: >>> >>>> Hi Kris, >>>> >>>> You are right. Security Key should be a structured data, besides the >>>> key material, it should includes something like lifetime, KeyID, >>>> .....Correct? >>>> >>>> Many thanks! >>>> >>>> Qin >>>> >>>> >>>> On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote: >>>> >>>>> is the security key a string? That doesn't seem right. >>>>> >>>>> ksjp >>>>> >>>>> >>>>> On 8/19/2013 2:05 PM, Qin Wang wrote: >>>>> >>>>> Hi all, >>>>> >>>>> I separate a thread from thread "Message Flows", to discuss the >>>>> format for management messages, e.g. JSON, BSON, or others. >>>>> >>>>> As Thomas's suggestion, before delving into the representation of >>>>> the information, we firstly identify what the contents of the different >>>>> signaling packets are, and in addition, what the data structures they may >>>>> use. >>>>> >>>>> I would like to take the commands defined >>>>> in draft-wang-6tsch-6top-00 as starting point. Here are the parameters in >>>>> those commands. >>>>> >>>>> //integer >>>>> (1) xxxID, e.g. TrackID, SlotframeID >>>>> (2) xxxOffset, e.g. SlotOffset >>>>> (3) NumOfxxx/Length >>>>> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority >>>>> (5) Status >>>>> (6) ASN (5Byte integer), e.g. last time when a packet received from >>>>> a neighbor >>>>> >>>>> //string >>>>> (7) L2 address >>>>> (8) SecurityKey >>>>> >>>>> //bitmap >>>>> (9) LinkOption >>>>> >>>>> //floating >>>>> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics >>>>> >>>>> Maybe something else........ >>>>> >>>>> Now, we can evaluate different representation methods. What do you >>>>> think? >>>>> >>>>> Thanks >>>>> Qin >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list6tsch@ietf.orghttps://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> > --20cf307f3bfa983b0f04e478ad42 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Thomas, Xavi and all,

    I went through= the 6top commands defined in=A0http://tools.ietf.org/html/draft-wang-6tsch-6= top-00#section-2.4=A0and put them into= the three control flows. See the attached file. As Xavi suggested, it is b= ottom-up approach, thus, leaving lots of TODOs to top-down approach.=A0

    It is just start point. Any comments and suggestions are = welcome.

    Qin


    On Wed, Aug 21, 2= 013 at 1:46 PM, Thomas Watteyne <watteyne@eecs.berkeley.edu&g= t; wrote:
    Qin,
    I totally agree wi= th these flows.
    Th= omas


    On Tue, Aug 20, 2013 at 6:39= AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Thomas,

    I agre= e with you. Let's identify the control flows first.=A0

    Assume there is a management entity (ME) which may be exist in PCE (in= centrilized case) or upper layer of mote (in distributed caes). The contro= l flows discussed here are between ME and 6top of mote. Then, I think there= are three kinds of flows as follows.

    (1) Action Flow. ME sends a action request (e.g. create= /delete hardcell/update/softcell, create/delete/update slotframe) to 6top, = 6top executes the action request, and then 6top responses confirmation mess= age.=A0
    (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics,= read timesource) to 6top, 6top responses the corresponding information in = the local MIB.
    (3) Report Flow. According to some criteria config= ured in mote (e.g. periodically), 6top reports the information in local MIB= . From the 6top's commands point of view, it is a kind of query trigger= ed by 6top of mote self.

    What do you think?

    Thanks
    Qin




    =





    On Tue, Aug 20, 2013 at 2:07 PM, Thomas = Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    Thanks for starting the thread! I = have comment which my sound a bit vague, but it's on purpose :)

    Do you envision that the flows will match the 6tos comman= ds exactly? That is, are you considering that the packets sent between diff= erent devices in the network (PCE, motes, etc) contain the same commands as= the 6top set of commands from=A0http://tools.ietf.org/h= tml/draft-wang-6tsch-6top-00#section-2.4?

    Maybe we could by identifying the flows that we are con= sidering, then the contents of those packets (possibly described using some= high level representation such as JSON), and only then worry about their e= fficient representation (e.g. BSON). Just a thought.

    Thomas

    On Mon, Aug 19, 2013 at 3:54 PM, Qin= Wang <qinwang@berkeley.edu> wrote:
    Hi Kris,

    You are right= . Security Key should be a structured data, besides the key material, it sh= ould includes something like lifetime, KeyID, .....Correct?

    Many thanks!

    Qin


    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@b= erkeley.edu> wrote:
    =20 =20 =20
    is the security key a string?=A0 That doesn't seem right.

    ksjp


    On 8/19/2013 2:05 PM, Qin Wang wrote:
    Hi all,

    I separate a thread from thread "Message Flows", to = discuss the format for management messages, e.g. JSON, BSON, or others.

    As Thomas's suggestion, before delving into the representation of the information, we firstly identify what the contents of the different signaling packets are, and in addition, what the data structures they may use.=A0
    I would like to take the commands defined in=A0draft-wang-6tsch-6top-00 as starting point. Here are the parameters in those commands.

    //integer
    (1) xxxID, e.g. TrackID, SlotframeID
    (2) xxxOffset, e.g. SlotOffset
    (3) NumOfxxx/Length
    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0
    (5) Status
    (6) ASN (5Byte integer), e.g. last time when a packet received from a neighbor

    //string
    (7) L2 address
    (8) SecurityKey

    //bitmap
    (9) LinkOption

    //floating
    (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics

    Maybe something else........

    Now, we can evaluate different representation methods. What do you think?

    Thanks
    Qin


    =A0=A0


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ttps://www.ietf.org/mailman/listinfo/6tsch



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10024) with ESMTP id sC7txRPOctk9 for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 11:49:42 -0700 (PDT) Received: from mail-pd0-f173.google.com (mail-pd0-f173.google.com [209.85.192.173]) by ietfa.amsl.com (Postfix) with ESMTP id D54A521F9C68 for <6tsch@ietf.org>; Wed, 21 Aug 2013 11:49:41 -0700 (PDT) Received: by mail-pd0-f173.google.com with SMTP id p10so791708pdj.4 for <6tsch@ietf.org>; Wed, 21 Aug 2013 11:49:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:date:message-id:subject :from:to:content-type; bh=rJQUtkZDsWGglplPjP7wArcB2SO6+oaAuqVBZgSY6aA=; b=LbBZdnbPMoupFES7w/pMuO/mFntW6p+gbJ1wdUR6jDydQ/SlSHHIwUctyBThhuUrjI rHzVpoJ9tETSZE3lhPVUBIhIR/AoS+9JVJIt6HvmteURdyCxusFlnlXlFAWOAdDlZWvW HIWQzQOLNM0AW//EOBihD4PSCs5f/RgK4uKs0mebLfpJqpQxs0fSxsL/sDGYP345wZfY 5eEFG02D+5WP0HO8quHkBB4qMqySabJWZqH19+6X4WqcvMMI0n6T378aV6oNHjx+Ksr9 CaHebRBbGaxpaG9HnHUXnJIeBIvUUl9YuHxjpQgDfqC9wfTer1YXRu7Qg+D33ukAbYDj nMzQ== X-Gm-Message-State: ALoCoQnKhSebwHn7TkBKyPPjbe0Z3es0AIohz6hUJoNo+0ID+GdcrFVxips/78vk1HMRGiq24M3D MIME-Version: 1.0 X-Received: by 10.66.27.143 with SMTP id t15mr1140390pag.171.1377110981509; Wed, 21 Aug 2013 11:49:41 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Wed, 21 Aug 2013 11:49:41 -0700 (PDT) Date: Wed, 21 Aug 2013 11:49:41 -0700 Message-ID: From: Xavier Vilajosana Guillen To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=bcaec52bea19de90e004e479a218 Subject: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Aug 2013 18:49:47 -0000 --bcaec52bea19de90e004e479a218 Content-Type: text/plain; charset=ISO-8859-1 Hi all, I want to propose to add in the basic TSCH draft the fact that when a node joins a network, it uses the EB join priority defined in the Slot and Link IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node with lowest EB Join Priority. In case of receiving multiple EBs with the same Join priority then filters by other metrics e.g RSSI of the link. (note that until a DIO is received nodes don not know about the gradient). A node when sends an EB uses the lowest EB Join priority it has heard and adds 1 to it as its own Join priority. Current draft section states that RSSI or another metric should be used to select the initial time parent, this has the problem that loops cannot be avoided until the first DIO is received. With the proposed approach the problem is solved and does not introduce anything new, just used what 15.4e provides to us. what is your opinion? thanks! Xavi --bcaec52bea19de90e004e479a218 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi all,

    I want to propose to add in the b= asic TSCH draft the fact that when a node joins a network, it uses the EB j= oin priority defined in the Slot and Link IE (Section 5.2.4.13 15.4e std) t= o select its time parent. This priority is 0 for the PAN coordinator of the= network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).
    A node when sends an EB uses the lowest EB Join priority it has heard= and adds 1 to it as its own Join priority.


    Current draft sectio= n states that RSSI or another metric should be used to select the initial t= ime parent, this has the problem that loops cannot be avoided until the fir= st DIO is received. With the proposed approach the problem is solved and do= es not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?
    thanks!
    Xavi
    --bcaec52bea19de90e004e479a218-- From qinwang@berkeley.edu Wed Aug 21 12:20:28 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EA6EB21F9BD0 for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 12:20:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.955 X-Spam-Level: X-Spam-Status: No, score=-2.955 tagged_above=-999 required=5 tests=[AWL=0.021, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tnOlwiq7qwnX for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 12:20:23 -0700 (PDT) Received: from mail-vc0-f169.google.com (mail-vc0-f169.google.com [209.85.220.169]) by ietfa.amsl.com (Postfix) with ESMTP id C82D521F9EEC for <6tsch@ietf.org>; Wed, 21 Aug 2013 12:20:22 -0700 (PDT) Received: by mail-vc0-f169.google.com with SMTP id ib11so559702vcb.28 for <6tsch@ietf.org>; Wed, 21 Aug 2013 12:20:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=h0XWstSYwF9fPghp2ZQoXCpjRcT2Fdx+n8T+qmFxIPw=; b=Jc10fM/t5frX2qDH7oshD7Ohz2Pn027KJbT7eDR7b6ea9oQGH9prGSm59OpfwS8w1w uJqx9sHudjATZ5JZazMAS4yD6Nln6hUz3Dv5Dz89gnv9v5lfBcUsS4L7zFasuTyX3eU2 f8zgw0OaxKH6/eT/5EPl1kBZCbTEuvspUTou0lfZxbdDn9vT1YQ0rOqtXcKPHvf9i17X NyhBa3ScWTCvQwKGgHO3iFy4BQca5o0VptQcb8xx6whr/BMLXYB9hvkuhgiqD/J6jG6a CYC3dPJQI5yu5ag9qM44sAi4mVd4fachTvXJLfLImBOZ+c/Xi784d0IMVesyEkL9HqCK qOcQ== X-Gm-Message-State: ALoCoQkwL+W+1BhIlnIBqtuh1gos3NYSpSiAdSGxRcfDnU2INTzDMfkOmm1z5YHYk2eDozs8abKf MIME-Version: 1.0 X-Received: by 10.52.92.73 with SMTP id ck9mr6578320vdb.2.1377112822178; Wed, 21 Aug 2013 12:20:22 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Wed, 21 Aug 2013 12:20:22 -0700 (PDT) In-Reply-To: References: Date: Thu, 22 Aug 2013 03:20:22 +0800 Message-ID: From: Qin Wang To: Xavier Vilajosana Guillen Content-Type: multipart/alternative; boundary=20cf3071c88694f8e704e47a1048 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Aug 2013 19:20:28 -0000 --20cf3071c88694f8e704e47a1048 Content-Type: text/plain; charset=ISO-8859-1 Hi Xavi, It is a good idea to use Priority in EB as a factor to choose initial time parent. But, I think there are several ways to use the Priority, and other metrics like RSSI. For example, (1) As you suggested, use Priority first, and then RSSI (2) or use RSSI first, and then Priority (3) or use a function of Priority and RSSI. I'm not sure which is better. What do you think? Qin On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi all, > > I want to propose to add in the basic TSCH draft the fact that when a node > joins a network, it uses the EB join priority defined in the Slot and Link > IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is > 0 for the PAN coordinator of the network. A node listening several EB > selects as a time parent the node with lowest EB Join Priority. In case of > receiving multiple EBs with the same Join priority then filters by other > metrics e.g RSSI of the link. (note that until a DIO is received nodes don > not know about the gradient). > A node when sends an EB uses the lowest EB Join priority it has heard and > adds 1 to it as its own Join priority. > > > Current draft section states that RSSI or another metric should be used to > select the initial time parent, this has the problem that loops cannot be > avoided until the first DIO is received. With the proposed approach the > problem is solved and does not introduce anything new, just used what 15.4e > provides to us. > > what is your opinion? > thanks! > Xavi > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --20cf3071c88694f8e704e47a1048 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Xavi,

    It is a good idea to use Prior= ity in EB as a factor to choose initial time parent. But, I think there are= several ways to use the Priority, and other metrics like RSSI. For example= ,

    (1) As you suggested, use Priority first, and then RSSI=
    (2) or use RSSI first, and then Priority
    (3) or use a = function of Priority and RSSI.

    I'm not sure wh= ich is better. What do you think?

    Qin



    On Thu, Aug 22, 2013 at 2:49 AM, Xavie= r Vilajosana Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi all,

    I = want to propose to add in the basic TSCH draft the fact that when a node jo= ins a network, it uses the EB join priority defined in the Slot and Link IE= (Section 5.2.4.13 15.4e std) to select its time parent. This priority is 0= for the PAN coordinator of the network. A node listening several EB select= s as a time parent the node with lowest EB Join Priority. In case of receiv= ing multiple EBs with the same Join priority then filters by other metrics = e.g RSSI of the link. (note that until a DIO is received nodes don not know= about the gradient).
    A node when sends an EB uses the lowest EB Join priority it has heard= and adds 1 to it as its own Join priority.


    Current draft sectio= n states that RSSI or another metric should be used to select the initial t= ime parent, this has the problem that loops cannot be avoided until the fir= st DIO is received. With the proposed approach the problem is solved and do= es not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?
    thanks!
    Xavi

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --20cf3071c88694f8e704e47a1048-- From xvilajosana@berkeley.edu Wed Aug 21 12:23:09 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AE7EF21F9F97 for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 12:23:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.133 X-Spam-Level: X-Spam-Status: No, score=-2.133 tagged_above=-999 required=5 tests=[AWL=-0.157, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3ASXiDF5g9zy for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 12:23:05 -0700 (PDT) Received: from mail-pd0-f171.google.com (mail-pd0-f171.google.com [209.85.192.171]) by ietfa.amsl.com (Postfix) with ESMTP id 8D5CB21F9BB5 for <6tsch@ietf.org>; Wed, 21 Aug 2013 12:23:05 -0700 (PDT) Received: by mail-pd0-f171.google.com with SMTP id g10so827630pdj.2 for <6tsch@ietf.org>; Wed, 21 Aug 2013 12:23:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=Gu4MiDmA6nuC3ssankz9VkUxNaAHO/CmUWuFY5sOrdI=; b=N7NtkkGhMjK1v905F6ICWGl4vcEai3pxjqkV7vpDNNIkt7ra1zjs0xfLWCgiOdb6Kl YxBj/dYFoCprqSqtlOBlaNBfBUygiFLkbFuH0WoDhFA5PI1FghutsuqkD//kk8NoD8Xn KlkF2i/s6veWidBSJb4YEH+MrDu/VuUBqhrJ7IF3T9tp9IjPuc4ojeDPXIOsJ+HKqkH3 86ALz4h5CXMTeu7v5QM+FxJB6EUN056JWALIxYBRLaWWKs/5CZPt5XD3Lr+9JZy1VV5j AkWQSenTP7DoeNO9Ldk6OyDMyM98KJR2LvHiLlduxl+Y8Jz7JTDJfUECpLquv5R3L9Iy ae5Q== X-Gm-Message-State: ALoCoQlad7Z7TfHAfHvzXf7KTFE6QfR1zNZsjR4bC/Fy3bcMweVwbcq4R++fi6bhRsqiMBdzmO1H MIME-Version: 1.0 X-Received: by 10.68.125.226 with SMTP id mt2mr1325657pbb.115.1377112984553; Wed, 21 Aug 2013 12:23:04 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Wed, 21 Aug 2013 12:23:04 -0700 (PDT) In-Reply-To: References: Date: Wed, 21 Aug 2013 12:23:04 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=047d7b2e48224299f204e47a1a3a Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Aug 2013 19:23:09 -0000 --047d7b2e48224299f204e47a1a3a Content-Type: text/plain; charset=ISO-8859-1 HI Qin, as a basic setting we want the most basic approach. I guess that using (1) first priority and then RSSi will avoid having loops. As you say all this approaches would work but I bet for (1) to be the simplest. cheers! X On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote: > Hi Xavi, > > It is a good idea to use Priority in EB as a factor to choose initial time > parent. But, I think there are several ways to use the Priority, and other > metrics like RSSI. For example, > > (1) As you suggested, use Priority first, and then RSSI > (2) or use RSSI first, and then Priority > (3) or use a function of Priority and RSSI. > > I'm not sure which is better. What do you think? > > Qin > > > > On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote: > >> Hi all, >> >> I want to propose to add in the basic TSCH draft the fact that when a >> node joins a network, it uses the EB join priority defined in the Slot and >> Link IE (Section 5.2.4.13 15.4e std) to select its time parent. This >> priority is 0 for the PAN coordinator of the network. A node listening >> several EB selects as a time parent the node with lowest EB Join Priority. >> In case of receiving multiple EBs with the same Join priority then filters >> by other metrics e.g RSSI of the link. (note that until a DIO is received >> nodes don not know about the gradient). >> A node when sends an EB uses the lowest EB Join priority it has heard and >> adds 1 to it as its own Join priority. >> >> >> Current draft section states that RSSI or another metric should be used >> to select the initial time parent, this has the problem that loops cannot >> be avoided until the first DIO is received. With the proposed approach the >> problem is solved and does not introduce anything new, just used what 15.4e >> provides to us. >> >> what is your opinion? >> thanks! >> Xavi >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > --047d7b2e48224299f204e47a1a3a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    HI Qin,

    as a basic setting we want the most ba= sic approach. I guess that using (1) first priority and then RSSi will avoi= d having loops. As you say all this approaches would work but I bet for (1)= to be the simplest.

    cheers!
    X


    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@= berkeley.edu> wrote:
    Hi Xavi,

    It is a good idea to use Priority in EB as a factor to choose initial time= parent. But, I think there are several ways to use the Priority, and other= metrics like RSSI. For example,

    (1) As you suggested, use Priority first, and then RSSI=
    (2) or use RSSI first, and then Priority
    (3) or use a = function of Priority and RSSI.

    I'm not sure wh= ich is better. What do you think?

    Qin



    On Thu, Aug 22,= 2013 at 2:49 AM, Xavier Vilajosana Guillen <xvilajosana@eec= s.berkeley.edu> wrote:
    Hi all,

    I want to propose to add in the basic TSC= H draft the fact that when a node joins a network, it uses the EB join prio= rity defined in the Slot and Link IE (Section 5.2.4.13 15.4e std) to select= its time parent. This priority is 0 for the PAN coordinator of the network= . A node listening several EB selects as a time parent the node with lowest= EB Join Priority. In case of receiving multiple EBs with the same Join pri= ority then filters by other metrics e.g RSSI of the link. (note that until = a DIO is received nodes don not know about the gradient).
    A node when sends an EB uses the lowest EB Join priority it has heard= and adds 1 to it as its own Join priority.


    Current draft sectio= n states that RSSI or another metric should be used to select the initial t= ime parent, this has the problem that loops cannot be avoided until the fir= st DIO is received. With the proposed approach the problem is solved and do= es not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?
    thanks!
    Xavi

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    --047d7b2e48224299f204e47a1a3a-- From qinwang@berkeley.edu Wed Aug 21 13:15:14 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 83FB011E8177 for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 13:15:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.956 X-Spam-Level: X-Spam-Status: No, score=-2.956 tagged_above=-999 required=5 tests=[AWL=0.020, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EIEuMyKSh0HI for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 13:15:10 -0700 (PDT) Received: from mail-vb0-f45.google.com (mail-vb0-f45.google.com [209.85.212.45]) by ietfa.amsl.com (Postfix) with ESMTP id 3322F11E814F for <6tsch@ietf.org>; Wed, 21 Aug 2013 13:15:10 -0700 (PDT) Received: by mail-vb0-f45.google.com with SMTP id e15so655173vbg.32 for <6tsch@ietf.org>; Wed, 21 Aug 2013 13:15:05 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=sOIbkK21TXx5t/sRQyc4puQGrb1g2fl08R0/vqEtjOI=; b=FzA0C0ggB0keJ3E+ThsJdChMgXLmUmz14DmHF+i8szJxqJfnr05+rqQ5CCgf8Vz2z2 xKciIM7e6UNECumcoBTLzRe/H75tDeGkA/7OI9wNEt89YN81tVwCPUbcp2f6L2XPaftg Q/cY+3QAR8fW34UrYULqom/ZiFKeDCyRzJu7XHXG9oav+NnDM3Xpr2uCDxnFaoDRCcxr e6Blq0S2apR55eBHPiRNUyG18ntDarVDWJnJ52SUi2o3jxcXfyGx+l0OlQ0RuPZa4IvF SGc1t90huN1s6gU7OXx1WdBoBwRBY1q7Ca9oOa/31i8vkxkFD+whW3tkKXwvf94wB0zb 7f7A== X-Gm-Message-State: ALoCoQm9QJN5hx16Mi1nLr77Otb4otRxWORokJd8HdwY1NjTUZqr85mHwH2GuPe8IdS8mR2s9I+o MIME-Version: 1.0 X-Received: by 10.52.35.171 with SMTP id i11mr6664073vdj.4.1377116105845; Wed, 21 Aug 2013 13:15:05 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Wed, 21 Aug 2013 13:15:05 -0700 (PDT) In-Reply-To: References: Date: Thu, 22 Aug 2013 04:15:05 +0800 Message-ID: From: Qin Wang To: Xavier Vilajosana Guillen Content-Type: multipart/alternative; boundary=20cf307d02344dc84e04e47ad40c Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Aug 2013 20:15:14 -0000 --20cf307d02344dc84e04e47ad40c Content-Type: text/plain; charset=ISO-8859-1 Agree! Qin On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > HI Qin, > > as a basic setting we want the most basic approach. I guess that using (1) > first priority and then RSSi will avoid having loops. As you say all this > approaches would work but I bet for (1) to be the simplest. > > cheers! > X > > > On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote: > >> Hi Xavi, >> >> It is a good idea to use Priority in EB as a factor to choose initial >> time parent. But, I think there are several ways to use the Priority, and >> other metrics like RSSI. For example, >> >> (1) As you suggested, use Priority first, and then RSSI >> (2) or use RSSI first, and then Priority >> (3) or use a function of Priority and RSSI. >> >> I'm not sure which is better. What do you think? >> >> Qin >> >> >> >> On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote: >> >>> Hi all, >>> >>> I want to propose to add in the basic TSCH draft the fact that when a >>> node joins a network, it uses the EB join priority defined in the Slot and >>> Link IE (Section 5.2.4.13 15.4e std) to select its time parent. This >>> priority is 0 for the PAN coordinator of the network. A node listening >>> several EB selects as a time parent the node with lowest EB Join Priority. >>> In case of receiving multiple EBs with the same Join priority then filters >>> by other metrics e.g RSSI of the link. (note that until a DIO is received >>> nodes don not know about the gradient). >>> A node when sends an EB uses the lowest EB Join priority it has heard >>> and adds 1 to it as its own Join priority. >>> >>> >>> Current draft section states that RSSI or another metric should be used >>> to select the initial time parent, this has the problem that loops cannot >>> be avoided until the first DIO is received. With the proposed approach the >>> problem is solved and does not introduce anything new, just used what 15.4e >>> provides to us. >>> >>> what is your opinion? >>> thanks! >>> Xavi >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> > --20cf307d02344dc84e04e47ad40c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Agree!

    Qin


    On Thu, Aug 22, 2013 at 3:23 A= M, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    HI Qin,

    as a ba= sic setting we want the most basic approach. I guess that using (1) first p= riority and then RSSi will avoid having loops. As you say all this approach= es would work but I bet for (1) to be the simplest.

    cheers!
    X


    On Wed, Aug 21, 2013 at 12:20 = PM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Xavi,

    It is a good idea to use Priority in EB as a factor to choose initial time= parent. But, I think there are several ways to use the Priority, and other= metrics like RSSI. For example,

    (1) As you suggested, use Priority first, and then RSSI=
    (2) or use RSSI first, and then Priority
    (3) or use a = function of Priority and RSSI.

    I'm not sure wh= ich is better. What do you think?

    Qin



    On Thu, Aug 22, 2013 at 2:49= AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu<= /a>> wrote:
    =
    Hi all,

    I want to propose to add in the basic TSCH draft the fa= ct that when a node joins a network, it uses the EB join priority defined i= n the Slot and Link IE (Section 5.2.4.13 15.4e std) to select its time pare= nt. This priority is 0 for the PAN coordinator of the network. A node liste= ning several EB selects as a time parent the node with lowest EB Join Prior= ity. In case of receiving multiple EBs with the same Join priority then fil= ters by other metrics e.g RSSI of the link. (note that until a DIO is recei= ved nodes don not know about the gradient).
    A node when sends an EB uses the lowest EB Join priority it has heard= and adds 1 to it as its own Join priority.


    Current draft sectio= n states that RSSI or another metric should be used to select the initial t= ime parent, this has the problem that loops cannot be avoided until the fir= st DIO is received. With the proposed approach the problem is solved and do= es not introduce anything new, just used what 15.4e provides to us.


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch




    --20cf307d02344dc84e04e47ad40c-- From twatteyne@gmail.com Wed Aug 21 21:37:12 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 12F8D11E825C for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 21:37:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.908 X-Spam-Level: X-Spam-Status: No, score=-1.908 tagged_above=-999 required=5 tests=[AWL=0.069, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nT0MGIW1SWDO for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 21:37:11 -0700 (PDT) Received: from mail-pa0-x22b.google.com (mail-pa0-x22b.google.com [IPv6:2607:f8b0:400e:c03::22b]) by ietfa.amsl.com (Postfix) with ESMTP id 0097911E8236 for <6tsch@ietf.org>; Wed, 21 Aug 2013 21:37:10 -0700 (PDT) Received: by mail-pa0-f43.google.com with SMTP id hz10so1640011pad.30 for <6tsch@ietf.org>; Wed, 21 Aug 2013 21:37:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=vk1ESdVykTSgDMybFDzKxOZbWNarT27WPWCuicPJSEg=; b=JJ2Nad6dLYQngsL204Vqf7Zl3RaitNQmuChst9FW2Im5rgblhcooRtwmcxCyQ0VaLW VNfxYUtEc5qN87QiCK+4lpH5Eysz5bFomlByG1Hwr0P44NadHzzWNDjql/tWQQP8zk7A 2iTfDYNsBY4jRsqsZqSDAjrRPJSbv+Wdr+WVld6sTEiRXFJ2vfj6DgIVyXemcAvlIsMK uuVOFRaHYyiWcDGONrJAcN60TDL8Sq54MGcVvbH688z8kNjH7TCCMAcYVj+ZQgx2pNWs P6LSmbNfO/GS2TY9CiYUWMaU44d3i97lT6ZbuTa70F30iMu5kRByJl7J0uv0KDzOYdBg kbtA== X-Received: by 10.66.248.161 with SMTP id yn1mr13305249pac.0.1377146230662; Wed, 21 Aug 2013 21:37:10 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Wed, 21 Aug 2013 21:36:50 -0700 (PDT) In-Reply-To: References: <52128ABD.3030800@berkeley.edu> From: Thomas Watteyne Date: Wed, 21 Aug 2013 21:36:50 -0700 X-Google-Sender-Auth: 3DlMIKyrMbqHMl9xaHDEkqxcTXY Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b15b043e1ee3a04e481d768 Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 04:37:12 -0000 --047d7b15b043e1ee3a04e481d768 Content-Type: text/plain; charset=ISO-8859-1 Qin, Wonderful. I guess we could add a READ function for the LS mapping, too? Although in your description you're assuming the ME installs the LS map, it would be nice if we could use the same format in a mote distribute way in the future (where some entity needs to query a node to learn its LS mapping). Even in the presence of an ME, something can happen (power failuer, bug) which requires it to retrieve what's already installed. I believe Table 3 is missing some entry for the node to send a request to the ME. Thomas On Wed, Aug 21, 2013 at 10:41 AM, Qin Wang wrote: > Hi Thomas, Xavi and all, > > I went through the 6top commands defined in > http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4 and put > them into the three control flows. See the attached file. As Xavi > suggested, it is bottom-up approach, thus, leaving lots of TODOs to > top-down approach. > > It is just start point. Any comments and suggestions are welcome. > > Qin > > > On Wed, Aug 21, 2013 at 1:46 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote: > >> Qin, >> I totally agree with these flows. >> Thomas >> >> >> On Tue, Aug 20, 2013 at 6:39 AM, Qin Wang wrote: >> >>> Thomas, >>> >>> I agree with you. Let's identify the control flows first. >>> >>> Assume there is a management entity (ME) which may be exist in PCE (in >>> centrilized case) or upper layer of mote (in distributed caes). The control >>> flows discussed here are between ME and 6top of mote. Then, I think there >>> are three kinds of flows as follows. >>> >>> (1) Action Flow. ME sends a action request (e.g. create/delete >>> hardcell/update/softcell, create/delete/update slotframe) to 6top, 6top >>> executes the action request, and then 6top responses confirmation message. >>> (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics, >>> read timesource) to 6top, 6top responses the corresponding information in >>> the local MIB. >>> (3) Report Flow. According to some criteria configured in mote (e.g. >>> periodically), 6top reports the information in local MIB. From the 6top's >>> commands point of view, it is a kind of query triggered by 6top of mote >>> self. >>> >>> What do you think? >>> >>> Thanks >>> Qin >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> On Tue, Aug 20, 2013 at 2:07 PM, Thomas Watteyne < >>> watteyne@eecs.berkeley.edu> wrote: >>> >>>> Qin, >>>> >>>> Thanks for starting the thread! I have comment which my sound a bit >>>> vague, but it's on purpose :) >>>> >>>> Do you envision that the flows will match the 6tos commands exactly? >>>> That is, are you considering that the packets sent between different >>>> devices in the network (PCE, motes, etc) contain the same commands as the >>>> 6top set of commands from >>>> http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4? >>>> >>>> Maybe we could by identifying the flows that we are considering, then >>>> the contents of those packets (possibly described using some high level >>>> representation such as JSON), and only then worry about their efficient >>>> representation (e.g. BSON). Just a thought. >>>> >>>> Thomas >>>> >>>> On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote: >>>> >>>>> Hi Kris, >>>>> >>>>> You are right. Security Key should be a structured data, besides the >>>>> key material, it should includes something like lifetime, KeyID, >>>>> .....Correct? >>>>> >>>>> Many thanks! >>>>> >>>>> Qin >>>>> >>>>> >>>>> On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote: >>>>> >>>>>> is the security key a string? That doesn't seem right. >>>>>> >>>>>> ksjp >>>>>> >>>>>> >>>>>> On 8/19/2013 2:05 PM, Qin Wang wrote: >>>>>> >>>>>> Hi all, >>>>>> >>>>>> I separate a thread from thread "Message Flows", to discuss the >>>>>> format for management messages, e.g. JSON, BSON, or others. >>>>>> >>>>>> As Thomas's suggestion, before delving into the representation of >>>>>> the information, we firstly identify what the contents of the different >>>>>> signaling packets are, and in addition, what the data structures they may >>>>>> use. >>>>>> >>>>>> I would like to take the commands defined >>>>>> in draft-wang-6tsch-6top-00 as starting point. Here are the parameters in >>>>>> those commands. >>>>>> >>>>>> //integer >>>>>> (1) xxxID, e.g. TrackID, SlotframeID >>>>>> (2) xxxOffset, e.g. SlotOffset >>>>>> (3) NumOfxxx/Length >>>>>> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority >>>>>> (5) Status >>>>>> (6) ASN (5Byte integer), e.g. last time when a packet received from >>>>>> a neighbor >>>>>> >>>>>> //string >>>>>> (7) L2 address >>>>>> (8) SecurityKey >>>>>> >>>>>> //bitmap >>>>>> (9) LinkOption >>>>>> >>>>>> //floating >>>>>> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related >>>>>> metrics >>>>>> >>>>>> Maybe something else........ >>>>>> >>>>>> Now, we can evaluate different representation methods. What do you >>>>>> think? >>>>>> >>>>>> Thanks >>>>>> Qin >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> 6tsch mailing list6tsch@ietf.orghttps://www.ietf.org/mailman/listinfo/6tsch >>>>>> >>>>>> >>>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>>> >>> >> > --047d7b15b043e1ee3a04e481d768 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Qin,

    Wonderful. I guess we could add a = READ function for the LS mapping, too? Although in your description you'= ;re assuming the ME installs the LS map, it would be nice if we could use t= he same format in a mote distribute way in the future (where some entity ne= eds to query a node to learn its LS mapping). Even in the presence of an ME= , something can happen (power failuer, bug) which requires it to retrieve w= hat's already installed.

    I believe Table 3 is missing some entry for the node to= send a request to the ME.

    Thomas


    On Wed, Aug 21, 20= 13 at 10:41 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Thomas, Xavi and all,
    I went through the 6top commands defined in=A0http://tools.i= etf.org/html/draft-wang-6tsch-6top-00#section-2.4=A0and put them into the three control flows. See the attached f= ile. As Xavi suggested, it is bottom-up approach, thus, leaving lots of TOD= Os to top-down approach.=A0

    It is just start point. Any comments and suggestions are = welcome.

    Qin


    On Wed, Aug 21, 2013 at 1:46 PM, Thoma= s Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,
    I totally agree wi= th these flows.
    Thomas


    On Tue, Aug 20, 2013 at 6:39 AM, Qin Wang <qinwang@ber= keley.edu> wrote:
    Thomas,

    I agre= e with you. Let's identify the control flows first.=A0

    Assume there is a management entity (ME) which may be exist in PCE (in= centrilized case) or upper layer of mote (in distributed caes). The contro= l flows discussed here are between ME and 6top of mote. Then, I think there= are three kinds of flows as follows.

    (1) Action Flow. ME sends a action request (e.g. create= /delete hardcell/update/softcell, create/delete/update slotframe) to 6top, = 6top executes the action request, and then 6top responses confirmation mess= age.=A0
    (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics,= read timesource) to 6top, 6top responses the corresponding information in = the local MIB.
    (3) Report Flow. According to some criteria config= ured in mote (e.g. periodically), 6top reports the information in local MIB= . From the 6top's commands point of view, it is a kind of query trigger= ed by 6top of mote self.

    What do you think?

    Thanks
    Qin




    =





    On Tue, Aug 20, 2013 at 2:07 PM, Thomas = Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    Thanks for starting the thread! I = have comment which my sound a bit vague, but it's on purpose :)

    Do you envision that the flows will match the 6tos comman= ds exactly? That is, are you considering that the packets sent between diff= erent devices in the network (PCE, motes, etc) contain the same commands as= the 6top set of commands from=A0http://tools.ietf.org/h= tml/draft-wang-6tsch-6top-00#section-2.4?

    Maybe we could by identifying the flows that we are con= sidering, then the contents of those packets (possibly described using some= high level representation such as JSON), and only then worry about their e= fficient representation (e.g. BSON). Just a thought.

    Thomas

    On Mon, Aug 19, 2013 at 3:54 PM, Qin= Wang <qinwang@berkeley.edu> wrote:
    Hi Kris,

    You are right= . Security Key should be a structured data, besides the key material, it sh= ould includes something like lifetime, KeyID, .....Correct?

    Many thanks!

    Qin


    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@b= erkeley.edu> wrote:
    =20 =20 =20
    is the security key a string?=A0 That doesn't seem right.

    ksjp


    On 8/19/2013 2:05 PM, Qin Wang wrote:
    Hi all,

    I separate a thread from thread "Message Flows", to = discuss the format for management messages, e.g. JSON, BSON, or others.

    As Thomas's suggestion, before delving into the representation of the information, we firstly identify what the contents of the different signaling packets are, and in addition, what the data structures they may use.=A0
    I would like to take the commands defined in=A0draft-wang-6tsch-6top-00 as starting point. Here are the parameters in those commands.

    //integer
    (1) xxxID, e.g. TrackID, SlotframeID
    (2) xxxOffset, e.g. SlotOffset
    (3) NumOfxxx/Length
    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0
    (5) Status
    (6) ASN (5Byte integer), e.g. last time when a packet received from a neighbor

    //string
    (7) L2 address
    (8) SecurityKey

    //bitmap
    (9) LinkOption

    //floating
    (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics

    Maybe something else........

    Now, we can evaluate different representation methods. What do you think?

    Thanks
    Qin


    =A0=A0


    ________________________________________=
_______
6tsch mailing list
6tsch@ietf.org
h=
ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch





    --047d7b15b043e1ee3a04e481d768-- From twatteyne@gmail.com Wed Aug 21 23:06:45 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5A3A511E80D1 for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 23:06:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.913 X-Spam-Level: X-Spam-Status: No, score=-1.913 tagged_above=-999 required=5 tests=[AWL=0.064, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vBmO23IkgJRG for <6tsch@ietfa.amsl.com>; Wed, 21 Aug 2013 23:06:44 -0700 (PDT) Received: from mail-pa0-x22f.google.com (mail-pa0-x22f.google.com [IPv6:2607:f8b0:400e:c03::22f]) by ietfa.amsl.com (Postfix) with ESMTP id 592E711E80D7 for <6tsch@ietf.org>; Wed, 21 Aug 2013 23:06:44 -0700 (PDT) Received: by mail-pa0-f47.google.com with SMTP id kl13so1721986pab.20 for <6tsch@ietf.org>; Wed, 21 Aug 2013 23:06:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=JrlgPK8/qisx4gybAGk4niT8/Jetlx0n+CHdFtoO8Xg=; b=G+QKqz4joyCWgQdVuLFxQJRCVNuiDpurCDvDhOa/ryhPD6BQv+ZV2OtJg4/Aa+wifQ OiTC+4aHRa1OcibICTd8goystJ/V0/31uFMckLI9y8r3FXPpFpAGQVq75j7E2Mmzd893 j5U4WYRJr9i5H91JRA1kjIsb2anpYqgAgh6aGtDJL2CTn4/laJlksUnFXzBKc5FMEHDk g4wjwNLOVoasJP1yi1gNSOtzZ1WZj9utT68rI9j934PlTiZDSlGnu+iPWsd96bEjIOb6 VZM98lCzVmYhqZONCyVJsZRorMQWPfKAOCZwQWl3ClmrtqFjE6iMmnKdn9FqnCABni15 WJXA== X-Received: by 10.68.235.37 with SMTP id uj5mr3641079pbc.85.1377151604028; Wed, 21 Aug 2013 23:06:44 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Wed, 21 Aug 2013 23:06:23 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Wed, 21 Aug 2013 23:06:23 -0700 X-Google-Sender-Auth: iysMsZj5pV889WN3VMGeF65KAM8 Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b33c78828fc8904e4831825 Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 06:06:45 -0000 --047d7b33c78828fc8904e4831825 Content-Type: text/plain; charset=ISO-8859-1 Qin, Xavi, Excellent point. I believe that this is exactly what makes this 6TSCH work so interesting: figuring out how consolidate the views between upper and lower layers. In my mind, the join priority as you describe looks very much like a DAGrank. I believe there are, however, two potential questions we should not forget: - what if the joining mote does no get all of the EBs of its neighbor? - what happens when the topology changes and a node moves up or down in the DODAG? I would suggest the following: - once the node has fully joined, somehow tie the join priority to its RPL DAGrank. We might have to play with the metric to make the join priority look like a hop count, but I believe it is important the announced join priority changes when the mote moves up/down in the topology. - maybe consider the time source parent identified during the joining as temporary until the final time source parent is discovered. How the final one is discovered can through some command from the ME (see Qin's attachement), or after receiving many DIOs. Thomas On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang wrote: > Agree! > > Qin > > > On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote: > >> HI Qin, >> >> as a basic setting we want the most basic approach. I guess that using >> (1) first priority and then RSSi will avoid having loops. As you say all >> this approaches would work but I bet for (1) to be the simplest. >> >> cheers! >> X >> >> >> On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote: >> >>> Hi Xavi, >>> >>> It is a good idea to use Priority in EB as a factor to choose initial >>> time parent. But, I think there are several ways to use the Priority, and >>> other metrics like RSSI. For example, >>> >>> (1) As you suggested, use Priority first, and then RSSI >>> (2) or use RSSI first, and then Priority >>> (3) or use a function of Priority and RSSI. >>> >>> I'm not sure which is better. What do you think? >>> >>> Qin >>> >>> >>> >>> On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < >>> xvilajosana@eecs.berkeley.edu> wrote: >>> >>>> Hi all, >>>> >>>> I want to propose to add in the basic TSCH draft the fact that when a >>>> node joins a network, it uses the EB join priority defined in the Slot and >>>> Link IE (Section 5.2.4.13 15.4e std) to select its time parent. This >>>> priority is 0 for the PAN coordinator of the network. A node listening >>>> several EB selects as a time parent the node with lowest EB Join Priority. >>>> In case of receiving multiple EBs with the same Join priority then filters >>>> by other metrics e.g RSSI of the link. (note that until a DIO is received >>>> nodes don not know about the gradient). >>>> A node when sends an EB uses the lowest EB Join priority it has heard >>>> and adds 1 to it as its own Join priority. >>>> >>>> >>>> Current draft section states that RSSI or another metric should be used >>>> to select the initial time parent, this has the problem that loops cannot >>>> be avoided until the first DIO is received. With the proposed approach the >>>> problem is solved and does not introduce anything new, just used what 15.4e >>>> provides to us. >>>> >>>> what is your opinion? >>>> thanks! >>>> Xavi >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>>> >>> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b33c78828fc8904e4831825 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Qin, Xavi,

    Excellent point. I believe t= hat this is exactly what makes this 6TSCH work so interesting: figuring out= how consolidate the views between upper and lower layers.

    In my mind, the join priority as you describe looks ver= y much like a DAGrank. I believe there are, however, two potential question= s we should not forget:
    - what if the joining mote does no get al= l of the EBs of its neighbor?
    - what happens when the topology changes and a node moves up or down i= n the DODAG?

    I would suggest the following:
    <= div>- once the node has fully joined, somehow tie the join priority to its = RPL DAGrank. We might have to play with the metric to make the join priorit= y look like a hop count, but I believe it is important the announced join p= riority changes when the mote moves up/down in the topology.
    - maybe consider the time source parent identified during the joining = as temporary until the final time source parent is discovered. How the fina= l one is discovered can through some command from the ME (see Qin's att= achement), or after receiving many DIOs.

    Thomas




    On Wed, Aug 21, 2013= at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:
    Agree!

    Qin
    =


    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    HI Qin,

    as a ba= sic setting we want the most basic approach. I guess that using (1) first p= riority and then RSSi will avoid having loops. As you say all this approach= es would work but I bet for (1) to be the simplest.

    cheers!
    X


    On= Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu><= /span> wrote:
    Hi Xavi,

    It is a good idea to use Priority in EB as a factor to choose initial time= parent. But, I think there are several ways to use the Priority, and other= metrics like RSSI. For example,

    (1) As you suggested, use Priority first, and then RSSI=
    (2) or use RSSI first, and then Priority
    (3) or use a = function of Priority and RSSI.

    I'm not sure wh= ich is better. What do you think?

    Qin



    On Thu, Aug 22, 2013 at 2:49= AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu<= /a>> wrote:
    =
    Hi all,

    I want to propose to add in the basic TSCH draft the fa= ct that when a node joins a network, it uses the EB join priority defined i= n the Slot and Link IE (Section 5.2.4.13 15.4e std) to select its time pare= nt. This priority is 0 for the PAN coordinator of the network. A node liste= ning several EB selects as a time parent the node with lowest EB Join Prior= ity. In case of receiving multiple EBs with the same Join priority then fil= ters by other metrics e.g RSSI of the link. (note that until a DIO is recei= ved nodes don not know about the gradient).
    A node when sends an EB uses the lowest EB Join priority it has heard= and adds 1 to it as its own Join priority.


    Current draft sectio= n states that RSSI or another metric should be used to select the initial t= ime parent, this has the problem that loops cannot be avoided until the fir= st DIO is received. With the proposed approach the problem is solved and do= es not introduce anything new, just used what 15.4e provides to us.


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch





    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b33c78828fc8904e4831825-- From pthubert@cisco.com Thu Aug 22 02:59:42 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EE43611E81A9 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 02:59:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.448 X-Spam-Level: X-Spam-Status: No, score=-10.448 tagged_above=-999 required=5 tests=[AWL=0.150, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ykf+7VKxgRmn for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 02:59:33 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id 5FFD211E819D for <6tsch@ietf.org>; Thu, 22 Aug 2013 02:59:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=19474; q=dns/txt; s=iport; t=1377165573; x=1378375173; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=q2Ff7ZNtCNAvFGPjY21kwZMEeniQXFBr44ZkA6HB2Ik=; b=SnmfERg9jIv0dOqxM8jGIpMLKB8iK4Q21F23TFNLtmHWaY58GfRiqOrL dGA5hp1kJoc29BxRSqFnYSqUjmWeFzHkXlxQPZqZAs6XoQMaA/zit3D5a UC7A+osKcmV14O56V8jC9+EPPAdM4d9NTPnDOouaZkVMJu5JLFfWtLuJq k=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqEFAEDgFVKtJV2a/2dsb2JhbABaDoIzRDVRwAeBHRZ0giUBAQQBAQEqQRsCAQgiHQcnCxQRAgQBEgiICAyufASQNS0Lgxt7A4VIjgSVdIJgP4FpJB4 X-IronPort-AV: E=Sophos;i="4.89,933,1367971200"; d="scan'208,217";a="250349061" Received: from rcdn-core-3.cisco.com ([173.37.93.154]) by rcdn-iport-2.cisco.com with ESMTP; 22 Aug 2013 09:59:30 +0000 Received: from xhc-aln-x15.cisco.com (xhc-aln-x15.cisco.com [173.36.12.89]) by rcdn-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id r7M9xUBB008120 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 22 Aug 2013 09:59:30 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-aln-x15.cisco.com ([173.36.12.89]) with mapi id 14.02.0318.004; Thu, 22 Aug 2013 04:59:29 -0500 From: "Pascal Thubert (pthubert)" To: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: [6tsch] time parent selection based on EB priority Thread-Index: AQHOnqOHH4PKkovH9kemcni7s7jXIpmgXkEAgAAOiYCAAKU1gP//5ekA Date: Thu, 22 Aug 2013 09:59:28 +0000 Deferred-Delivery: Thu, 22 Aug 2013 09:59:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.49.80.24] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD8414272A8xmbrcdx01ciscoc_" MIME-Version: 1.0 Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 09:59:42 -0000 --_000_E045AECD98228444A58C61C200AE1BD8414272A8xmbrcdx01ciscoc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear all: As you know, RPL may entail temporary loops, in particular if DAGMaxRankInc= rease is not configured to 0. If as we expect we use the RPL preferred parent tree for time sync, this wi= ll lead to time sync loops. Two questions here: 1) how bad is the effect of such loop? I expect that the clocks will deriv= e rapidly, as if from the perspective of a node the crystal was real, real = bad. 2) can we detect that effect and use it to detect a loop in the routing? Please see inline: sch] time parent selection based on EB priority Qin, Xavi, Excellent point. I believe that this is exactly what makes this 6TSCH work = so interesting: figuring out how consolidate the views between upper and lo= wer layers. In my mind, the join priority as you describe looks very much like a DAGran= k. I believe there are, however, two potential questions we should not forg= et: - what if the joining mote does no get all of the EBs of its neighbor? - what happens when the topology changes and a node moves up or down in the= DODAG? I would suggest the following: - once the node has fully joined, somehow tie the join priority to its RPL = DAGrank. We might have to play with the metric to make the join priority lo= ok like a hop count, but I believe it is important the announced join prior= ity changes when the mote moves up/down in the topology. - maybe consider the time source parent identified during the joining as te= mporary until the final time source parent is discovered. How the final one= is discovered can through some command from the ME (see Qin's attachement)= , or after receiving many DIOs. [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? Cheers, Pascal On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang > wrote: Agree! Qin On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen > wrote: HI Qin, as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest. cheers! X On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang > wrote: Hi Xavi, It is a good idea to use Priority in EB as a factor to choose initial time = parent. But, I think there are several ways to use the Priority, and other = metrics like RSSI. For example, (1) As you suggested, use Priority first, and then RSSI (2) or use RSSI first, and then Priority (3) or use a function of Priority and RSSI. I'm not sure which is better. What do you think? Qin On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen > wrote: Hi all, I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB sele= cts as a time parent the node with lowest EB Join Priority. In case of rece= iving multiple EBs with the same Join priority then filters by other metric= s e.g RSSI of the link. (note that until a DIO is received nodes don not kn= ow about the gradient). A node when sends an EB uses the lowest EB Join priority it has heard and a= dds 1 to it as its own Join priority. Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e pro= vides to us. what is your opinion? thanks! Xavi _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD8414272A8xmbrcdx01ciscoc_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Dear all:

     <= /p>

    As you know, RPL may enta= il temporary loops, in particular if DAGMaxRankIncrease is not configured t= o 0.

    If as we expect we use th= e RPL preferred parent tree for time sync, this will lead to time sync loop= s.

    Two questions here:<= /o:p>

    1) how bad is the effect = of such loop? I expect that the clocks  will derive rapidly, as if fro= m the perspective of a node the crystal was real, real bad.

    2) can we detect that eff= ect and use it to detect a loop in the routing?

     <= /p>

    Please see inline:

     <= /p>

    sch] time parent selection based on EB p= riority

     

    Qin, Xavi,

     

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

     

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

     

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important t= he announced join priority changes when the mote moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME = (see Qin's attachement), or after receiving many DIOs.

     <= /p>

    [Pascal] Yes, I read Xavi= ’s proposal as a mechanism parallel to RPL to do like an hop-count-ba= sed OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

     <= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL= DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and lis= ten to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate = to that parent as time source, and then can set their own priority to zero and send DIOs.

    Would that fly?

    Cheers,

    Pascal

     

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

     

    Qin<= /p>

     

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

     

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

     

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

     

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority<= /p>

    (3) or use a function of Priority and RSSI.

     

    I'm not sure which is better. What do you think?

     

    Qin

     

     

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

     

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_E045AECD98228444A58C61C200AE1BD8414272A8xmbrcdx01ciscoc_-- From alfredo.grieco@gmail.com Thu Aug 22 03:44:51 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 79B8721F9DE1 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 03:44:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id a9TI25jPYZam for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 03:44:51 -0700 (PDT) Received: from mail-wg0-x235.google.com (mail-wg0-x235.google.com [IPv6:2a00:1450:400c:c00::235]) by ietfa.amsl.com (Postfix) with ESMTP id B464221F9DC6 for <6tsch@ietf.org>; Thu, 22 Aug 2013 03:44:50 -0700 (PDT) Received: by mail-wg0-f53.google.com with SMTP id c11so1477094wgh.32 for <6tsch@ietf.org>; Thu, 22 Aug 2013 03:44:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:mime-version:content-type :content-transfer-encoding:thread-index:content-language; bh=f8enx+Nn4rtX/pHh6tgqwggcpLtcclPyY/RP94+2VJo=; b=UZMrpwhiucoRioHub5+OcpUlk1YrTpzBPHV7l5xv1gRsTZ89PBJg8s1NgP0+IbZuT4 0ax4067rrmMHeREMYNux9WuaV1htb0/MW7Qt7xkCpxGwKgGYRrXeFGDGMmPt6b5bUKCn qVsFMkPsM6sXuMRHcSQdwHpQMui/alWYVPYvIX2w0PlIt2rip1Y4oq+sJbcztXLDVEk4 EyqGLucfbYwDiTV3CNJxbAi5snECiY0PDhpFsbWzzGlt67YhFmyeY5uH8pcL7tJXeD10 WEZf7GAkKOgJ/z1nvvBfqUgGqCrvI3tjbzm/cREBaY/VobNCBU9YGAfYIKELaIlhjoH4 bBIw== X-Received: by 10.194.248.130 with SMTP id ym2mr820377wjc.61.1377168288919; Thu, 22 Aug 2013 03:44:48 -0700 (PDT) Received: from GriecoPC ([176.200.229.8]) by mx.google.com with ESMTPSA id jf2sm15763972wic.2.1969.12.31.16.00.00 (version=TLSv1 cipher=RC4-SHA bits=128/128); Thu, 22 Aug 2013 03:44:47 -0700 (PDT) From: "Alfredo Grieco" To: "'6TSCH'" <6tsch@ietf.org> Date: Thu, 22 Aug 2013 12:44:38 +0200 Message-ID: <5215eb9f.e2c6b40a.6b2c.ffffe7e1@mx.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Ac6fJJnUbOwlhyUcTzCyC3gMbzjs0w== Content-Language: en-us Cc: 'Gennaro Boggia' , 'Elvis Vogli' , 'Giuseppe' Subject: [6tsch] Synchronization Issues X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 10:44:51 -0000 Dear All, My research group is trying to test and develop fast bootstrapping techniques for TSCH. In particular, we are focusing on synchronization issues. We would like to share with you our thoughts to gain your comments. Assuming that the PAN coordinator starts sending EBs, its neighbors will send EB too after they get synchronized (i.e., when they successfully receive the EB sent by the coordinator). In this way, the synchronization is propagated downwards to the leaves. Unfortunately, the neighbors of the coordinator cannot know in advance the channel to listen (i.e., the channel the PAN coordinator will use to transmit EBs) so that it may take some time to establish the synchronization at one hop, and, as a consequence, till all nodes are reached by an EB (since the same problem holds also for the second, third hop and so on). The longer the bootstrap time the larger the amount of energy spent in for listening EBs. How to shorten this bootstrap time ? If we look at the pan coordinator, assuming it is powered by the mains, it could send more than one EB per superframe in order to swipe faster all available channels. Looking at the rest of the nodes that already received an EB, we could try to let them transmit an EB on average once every Multisuperframe in such a way that all channels are used in a reasonably short time. In this way, a new joining node could quickly receive an EB whatever the channel it is listening to. Any comment is welcome. Thanks in advance Alfredo -- Luigi Alfredo Grieco, Ph. D. Assistant Professor in Telecommunications DEE - Politecnico di Bari Via Orabona, 4 - 70125 - Bari - Italy Phone: +39 080 5963 911 Fax: +39 080 5963 410 telematics.poliba.it/grieco From xvilajosana@berkeley.edu Thu Aug 22 06:34:01 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B488421F9F08 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 06:34:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.114 X-Spam-Level: X-Spam-Status: No, score=-2.114 tagged_above=-999 required=5 tests=[AWL=-0.137, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hVMbpVYhYZIM for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 06:33:57 -0700 (PDT) Received: from mail-pd0-f172.google.com (mail-pd0-f172.google.com [209.85.192.172]) by ietfa.amsl.com (Postfix) with ESMTP id 8DFC121F96B1 for <6tsch@ietf.org>; Thu, 22 Aug 2013 06:33:57 -0700 (PDT) Received: by mail-pd0-f172.google.com with SMTP id z10so1888198pdj.31 for <6tsch@ietf.org>; Thu, 22 Aug 2013 06:33:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=8/gssGfVC48+ypl6qglDv9Tt4mzsMnmj4vwn39TuR9g=; b=nRZ/EzmfTmQJ1FeGhd0vHlU6cawv5GgdnrcgyJmg/8/j6wfNRSvoWo0Q61sW3y/N4J LrJZELy9pTpapfUtXOFroaCtns3aENk5c4iSVa5z94gi71UXpA+cSBGqcPs7ZYqH14bG y6A/et2afO4Qo2kzywy1Z7I3uRtTskTRX0jQAFUcH6wZ/zkGRKTGyrqzke4Lx4ISYrZL P047SK83M1TSPI3iTa3qiYyh0apBP7JwZ7yTAJPYHaWIzz1JB7mTwwd8XSR8c6LbJitf J0IesYyCfolk242T6fC1SfXTf2peTtfWiY3sUZ5aEngBDWbYIUfNKK2lFhfqSLztXcMG qW1g== X-Gm-Message-State: ALoCoQmaEpEcBQIMAAZAp4MUtVbpP3V9OfVxHPfkyJujXpJKWk6WXQxuOdtFhmNTIvH4r4NXzB5K MIME-Version: 1.0 X-Received: by 10.66.123.5 with SMTP id lw5mr5432262pab.83.1377178437046; Thu, 22 Aug 2013 06:33:57 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Thu, 22 Aug 2013 06:33:56 -0700 (PDT) In-Reply-To: References: Date: Thu, 22 Aug 2013 06:33:56 -0700 Message-ID: From: Xavier Vilajosana Guillen To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=047d7bf0e7c888616e04e4895704 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 13:34:01 -0000 --047d7bf0e7c888616e04e4895704 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pascal, my comment inline: [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.**** Q: Do we really need to build the time sync tree faster than the RPL graph?= * *** ** ** If no, maybe me could use the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.**** Initially only the root would be priority 0. All the others would be default 1.**** >From there, all nodes that are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.**** Children sync to whichever prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero and send DIOs.**** Would that fly? yes that would work but we are doing the same as the IEEE802-15.4e Join priority field is for. The 15.4e defines this mechanism and it is inherent to the networks we address so using it is straightforward. Then as described by Thomas, we only need to use RPL best parent as soon as we have one instead of the lowest prio neighbor. Another question with time sources is the selection of a time source parent in the case that a node belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic draft considers having more than one DODAG? thanks! Xavi On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Dear all:**** > > ** ** > > As you know, RPL may entail temporary loops, in particular if > DAGMaxRankIncrease is not configured to 0.**** > > If as we expect we use the RPL preferred parent tree for time sync, this > will lead to time sync loops. **** > > Two questions here:**** > > 1) how bad is the effect of such loop? I expect that the clocks will > derive rapidly, as if from the perspective of a node the crystal was real= , > real bad.**** > > 2) can we detect that effect and use it to detect a loop in the routing?*= * > ** > > ** ** > > Please see inline:**** > > ** ** > > sch] time parent selection based on EB priority**** > > ** ** > > Qin, Xavi,**** > > ** ** > > Excellent point. I believe that this is exactly what makes this 6TSCH wor= k > so interesting: figuring out how consolidate the views between upper and > lower layers.**** > > ** ** > > In my mind, the join priority as you describe looks very much like a > DAGrank. I believe there are, however, two potential questions we should > not forget:**** > > - what if the joining mote does no get all of the EBs of its neighbor?***= * > > - what happens when the topology changes and a node moves up or down in > the DODAG?**** > > ** ** > > I would suggest the following:**** > > - once the node has fully joined, somehow tie the join priority to its RP= L > DAGrank. We might have to play with the metric to make the join priority > look like a hop count, but I believe it is important the announced join > priority changes when the mote moves up/down in the topology.**** > > - maybe consider the time source parent identified during the joining as > temporary until the final time source parent is discovered. How the final > one is discovered can through some command from the ME (see Qin's > attachement), or after receiving many DIOs.**** > > ** ** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0. **** > > Q: Do we really need to build the time sync tree faster than the RPL > graph? **** > > ** ** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > Cheers,**** > > Pascal**** > > ** ** > > On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang wrote:**= * > * > > Agree!**** > > ** ** > > Qin**** > > ** ** > > On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > HI Qin, > > as a basic setting we want the most basic approach. I guess that using (1= ) > first priority and then RSSi will avoid having loops. As you say all this > approaches would work but I bet for (1) to be the simplest. **** > > cheers! > X**** > > ** ** > > On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote:*= * > ** > > Hi Xavi,**** > > ** ** > > It is a good idea to use Priority in EB as a factor to choose initial tim= e > parent. But, I think there are several ways to use the Priority, and othe= r > metrics like RSSI. For example,**** > > ** ** > > (1) As you suggested, use Priority first, and then RSSI**** > > (2) or use RSSI first, and then Priority**** > > (3) or use a function of Priority and RSSI.**** > > ** ** > > I'm not sure which is better. What do you think?**** > > ** ** > > Qin**** > > ** ** > > ** ** > > On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > Hi all, > > I want to propose to add in the basic TSCH draft the fact that when a nod= e > joins a network, it uses the EB join priority defined in the Slot and Lin= k > IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority = is > 0 for the PAN coordinator of the network. A node listening several EB > selects as a time parent the node with lowest EB Join Priority. In case o= f > receiving multiple EBs with the same Join priority then filters by other > metrics e.g RSSI of the link. (note that until a DIO is received nodes do= n > not know about the gradient).**** > > A node when sends an EB uses the lowest EB Join priority it has heard and > adds 1 to it as its own Join priority. > > > Current draft section states that RSSI or another metric should be used t= o > select the initial time parent, this has the problem that loops cannot be > avoided until the first DIO is received. With the proposed approach the > problem is solved and does not introduce anything new, just used what 15.= 4e > provides to us.**** > > what is your opinion?**** > > thanks! > Xavi**** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > ** ** > > ** ** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7bf0e7c888616e04e4895704 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pascal,

    my comment inline:



    On Thu, Aug 22, 2013 at= 2:59 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wr= ote:

    Dear all:

    =A0<= /p>

    As you know, RPL may enta= il temporary loops, in particular if DAGMaxRankIncrease is not configured t= o 0.

    If as we expect we use th= e RPL preferred parent tree for time sync, this will lead to time sync loop= s.

    Two questions here:

    1) how bad is the effect = of such loop? I expect that the clocks=A0 will derive rapidly, as if from t= he perspective of a node the crystal was real, real bad.

    2) can we detect that eff= ect and use it to detect a loop in the routing?

    =A0<= /p>

    Please see inline:=

    =A0<= /p>

    sch] time parent selection based on EB p= riority

    =A0

    Qin, Xavi,

    =A0

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

    =A0

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

    =A0

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important t= he announced join priority changes when the mote moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME = (see Qin's attachement), or after receiving many DIOs.

    =A0<= /p>

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based = OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL= DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and lis= ten to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate = to that parent as time source, and then can set their own priority to zero and send DIOs.

    Would that fly?

    Cheers,

    Pascal

    =A0

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!=

    =A0

    Qin

    =A0

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

    =A0

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

    =A0

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

    =A0

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

    =A0

    I'm not sure which is better. What do you think?=

    =A0

    Qin

    =A0

    =A0

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

    =A0

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7bf0e7c888616e04e4895704-- From qinwang@berkeley.edu Thu Aug 22 06:34:59 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E071F11E81B8 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 06:34:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.957 X-Spam-Level: X-Spam-Status: No, score=-2.957 tagged_above=-999 required=5 tests=[AWL=0.019, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UUiBTgu9D74C for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 06:34:55 -0700 (PDT) Received: from mail-vb0-f44.google.com (mail-vb0-f44.google.com [209.85.212.44]) by ietfa.amsl.com (Postfix) with ESMTP id 795E511E817A for <6tsch@ietf.org>; Thu, 22 Aug 2013 06:34:55 -0700 (PDT) Received: by mail-vb0-f44.google.com with SMTP id e13so1253474vbg.31 for <6tsch@ietf.org>; Thu, 22 Aug 2013 06:34:53 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=iG/6bXWY9TMQozAbV4UFyZdw8K0OjPFmEsE44uy6lYg=; b=LG269Hkoi0aUmxav+LSVDhTWsgsGQWx+859ctfnrkv7krzJsE8/xc9UF8V+Gz2N9d5 VqnmgzNrqrCTHiLEhNfss3xwu+orbqoS26NFP42AL+5YnpvLaeYuaBVGOJanzF9G0lBY 3AVEB/OWLKWm+t9hdGUr8y997a4ueRrFG4IeqI+rSa6xk3YmuCkMjD6DlZejHy4JtA2K DqsmSViXucGM0XncSA6ai17lmlbS5p252K2T+6ma24RHdogoRBT6W73pyQAb8CPgVN3J HNIZZalIYMV6W1H4YpvSK4fcFMDM/ui42voT7+lj8/qtlUwuVX9ZwJTWd1ktns/XyRMI wpOA== X-Gm-Message-State: ALoCoQkzQzjzb3YvJaybL0BOcAf8Nchh7zer9KIveEBaXWAsI/lF1OzWGc/LiWOxodwpCBKh/KUF MIME-Version: 1.0 X-Received: by 10.52.171.38 with SMTP id ar6mr9658180vdc.22.1377178490870; Thu, 22 Aug 2013 06:34:50 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 22 Aug 2013 06:34:50 -0700 (PDT) In-Reply-To: References: <52128ABD.3030800@berkeley.edu> Date: Thu, 22 Aug 2013 21:34:50 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7b6d95e6bdb00104e4895ad3 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 13:35:00 -0000 --047d7b6d95e6bdb00104e4895ad3 Content-Type: text/plain; charset=ISO-8859-1 Thomas, I add READ.labelswitch.status in Table 2 and Table 3. But, I don't understand "Table 3 is missing some entry for the node to send a request to the ME." very well. IMHO, the operations listed in Table 3 are triggered by some internal events of a node, e.g. timer if a periodic report is configured, and as result, the node will send some information in local MIB to ME, instead of sending a request to ME. Correct? Do I miss something? Thanks Qin On Thu, Aug 22, 2013 at 12:36 PM, Thomas Watteyne < watteyne@eecs.berkeley.edu> wrote: > Qin, > > Wonderful. I guess we could add a READ function for the LS mapping, too? > Although in your description you're assuming the ME installs the LS map, it > would be nice if we could use the same format in a mote distribute way in > the future (where some entity needs to query a node to learn its LS > mapping). Even in the presence of an ME, something can happen (power > failuer, bug) which requires it to retrieve what's already installed. > > I believe Table 3 is missing some entry for the node to send a request to > the ME. > > Thomas > > > On Wed, Aug 21, 2013 at 10:41 AM, Qin Wang wrote: > >> Hi Thomas, Xavi and all, >> >> I went through the 6top commands defined in >> http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4 and put >> them into the three control flows. See the attached file. As Xavi >> suggested, it is bottom-up approach, thus, leaving lots of TODOs to >> top-down approach. >> >> It is just start point. Any comments and suggestions are welcome. >> >> Qin >> >> >> On Wed, Aug 21, 2013 at 1:46 PM, Thomas Watteyne < >> watteyne@eecs.berkeley.edu> wrote: >> >>> Qin, >>> I totally agree with these flows. >>> Thomas >>> >>> >>> On Tue, Aug 20, 2013 at 6:39 AM, Qin Wang wrote: >>> >>>> Thomas, >>>> >>>> I agree with you. Let's identify the control flows first. >>>> >>>> Assume there is a management entity (ME) which may be exist in PCE (in >>>> centrilized case) or upper layer of mote (in distributed caes). The control >>>> flows discussed here are between ME and 6top of mote. Then, I think there >>>> are three kinds of flows as follows. >>>> >>>> (1) Action Flow. ME sends a action request (e.g. create/delete >>>> hardcell/update/softcell, create/delete/update slotframe) to 6top, 6top >>>> executes the action request, and then 6top responses confirmation message. >>>> (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics, >>>> read timesource) to 6top, 6top responses the corresponding information in >>>> the local MIB. >>>> (3) Report Flow. According to some criteria configured in mote (e.g. >>>> periodically), 6top reports the information in local MIB. From the 6top's >>>> commands point of view, it is a kind of query triggered by 6top of mote >>>> self. >>>> >>>> What do you think? >>>> >>>> Thanks >>>> Qin >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> On Tue, Aug 20, 2013 at 2:07 PM, Thomas Watteyne < >>>> watteyne@eecs.berkeley.edu> wrote: >>>> >>>>> Qin, >>>>> >>>>> Thanks for starting the thread! I have comment which my sound a bit >>>>> vague, but it's on purpose :) >>>>> >>>>> Do you envision that the flows will match the 6tos commands exactly? >>>>> That is, are you considering that the packets sent between different >>>>> devices in the network (PCE, motes, etc) contain the same commands as the >>>>> 6top set of commands from >>>>> http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4? >>>>> >>>>> Maybe we could by identifying the flows that we are considering, then >>>>> the contents of those packets (possibly described using some high level >>>>> representation such as JSON), and only then worry about their efficient >>>>> representation (e.g. BSON). Just a thought. >>>>> >>>>> Thomas >>>>> >>>>> On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote: >>>>> >>>>>> Hi Kris, >>>>>> >>>>>> You are right. Security Key should be a structured data, besides the >>>>>> key material, it should includes something like lifetime, KeyID, >>>>>> .....Correct? >>>>>> >>>>>> Many thanks! >>>>>> >>>>>> Qin >>>>>> >>>>>> >>>>>> On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote: >>>>>> >>>>>>> is the security key a string? That doesn't seem right. >>>>>>> >>>>>>> ksjp >>>>>>> >>>>>>> >>>>>>> On 8/19/2013 2:05 PM, Qin Wang wrote: >>>>>>> >>>>>>> Hi all, >>>>>>> >>>>>>> I separate a thread from thread "Message Flows", to discuss the >>>>>>> format for management messages, e.g. JSON, BSON, or others. >>>>>>> >>>>>>> As Thomas's suggestion, before delving into the representation of >>>>>>> the information, we firstly identify what the contents of the different >>>>>>> signaling packets are, and in addition, what the data structures they may >>>>>>> use. >>>>>>> >>>>>>> I would like to take the commands defined >>>>>>> in draft-wang-6tsch-6top-00 as starting point. Here are the parameters in >>>>>>> those commands. >>>>>>> >>>>>>> //integer >>>>>>> (1) xxxID, e.g. TrackID, SlotframeID >>>>>>> (2) xxxOffset, e.g. SlotOffset >>>>>>> (3) NumOfxxx/Length >>>>>>> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority >>>>>>> (5) Status >>>>>>> (6) ASN (5Byte integer), e.g. last time when a packet received >>>>>>> from a neighbor >>>>>>> >>>>>>> //string >>>>>>> (7) L2 address >>>>>>> (8) SecurityKey >>>>>>> >>>>>>> //bitmap >>>>>>> (9) LinkOption >>>>>>> >>>>>>> //floating >>>>>>> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related >>>>>>> metrics >>>>>>> >>>>>>> Maybe something else........ >>>>>>> >>>>>>> Now, we can evaluate different representation methods. What do you >>>>>>> think? >>>>>>> >>>>>>> Thanks >>>>>>> Qin >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> 6tsch mailing list6tsch@ietf.orghttps://www.ietf.org/mailman/listinfo/6tsch >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> 6tsch mailing list >>>>>> 6tsch@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>>> >>>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>>> >>>> >>> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b6d95e6bdb00104e4895ad3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Thomas,

    I add READ.labelswitch.status i= n Table 2 and Table 3.

    But, I don't understand= "Table 3 = is missing some entry for the node to send a request to the ME."= ; very well. IMHO, the operations listed in Table 3 are triggered by some i= nternal events of a node, e.g. timer if a periodic report is configured, an= d as result, the node will send some information in local MIB to ME, instea= d of sending a request to ME. Correct? Do I miss something?

    Thanks
    Qin


    On Thu, Aug 22, 2013 at 12:36 PM, Th= omas Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    Won= derful. I guess we could add a READ function for the LS mapping, too? Altho= ugh in your description you're assuming the ME installs the LS map, it = would be nice if we could use the same format in a mote distribute way in t= he future (where some entity needs to query a node to learn its LS mapping)= . Even in the presence of an ME, something can happen (power failuer, bug) = which requires it to retrieve what's already installed.

    I believe Table 3 is missing some entry for the node to= send a request to the ME.

    Thomas


    On Wed, Aug 21, 2013 at 10:41 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Thomas, Xavi and all,
    I went through the 6top commands defined in=A0http://tools.i= etf.org/html/draft-wang-6tsch-6top-00#section-2.4=A0and put them into the three control flows. See the attached f= ile. As Xavi suggested, it is bottom-up approach, thus, leaving lots of TOD= Os to top-down approach.=A0

    It is just start point. Any comments and suggestions are = welcome.

    Qin


    On Wed, Aug 21, 2013 at 1:46 PM, Thomas Watteyne &= lt;watteyne= @eecs.berkeley.edu> wrote:
    Qin,
    I totally agree wi= th these flows.
    Thomas


    On Tue, Aug 20, 2013 at 6:39 AM, Qin Wang <qinwang@ber= keley.edu> wrote:
    Thomas,

    I agre= e with you. Let's identify the control flows first.=A0

    Assume there is a management entity (ME) which may be exist in PCE (in= centrilized case) or upper layer of mote (in distributed caes). The contro= l flows discussed here are between ME and 6top of mote. Then, I think there= are three kinds of flows as follows.

    (1) Action Flow. ME sends a action request (e.g. create= /delete hardcell/update/softcell, create/delete/update slotframe) to 6top, = 6top executes the action request, and then 6top responses confirmation mess= age.=A0
    (2) Query Flow. ME sends a query (e.g. read neighbor, read statistics,= read timesource) to 6top, 6top responses the corresponding information in = the local MIB.
    (3) Report Flow. According to some criteria config= ured in mote (e.g. periodically), 6top reports the information in local MIB= . From the 6top's commands point of view, it is a kind of query trigger= ed by 6top of mote self.

    What do you think?

    Thanks
    Qin




    =





    On Tue, Aug 20, 2013 at 2:07 PM, Thomas = Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    Thanks for starting the thread! I = have comment which my sound a bit vague, but it's on purpose :)

    Do you envision that the flows will match the 6tos comman= ds exactly? That is, are you considering that the packets sent between diff= erent devices in the network (PCE, motes, etc) contain the same commands as= the 6top set of commands from=A0http://tools.ietf.org/h= tml/draft-wang-6tsch-6top-00#section-2.4?

    Maybe we could by identifying the flows that we are con= sidering, then the contents of those packets (possibly described using some= high level representation such as JSON), and only then worry about their e= fficient representation (e.g. BSON). Just a thought.

    Thomas

    On Mon, Aug 19, 2013 at 3:54 PM, Qin= Wang <qinwang@berkeley.edu> wrote:
    Hi Kris,

    You are right= . Security Key should be a structured data, besides the key material, it sh= ould includes something like lifetime, KeyID, .....Correct?

    Many thanks!

    Qin


    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@b= erkeley.edu> wrote:
    =20 =20 =20
    is the security key a string?=A0 That doesn't seem right.

    ksjp


    On 8/19/2013 2:05 PM, Qin Wang wrote:
    Hi all,

    I separate a thread from thread "Message Flows", to = discuss the format for management messages, e.g. JSON, BSON, or others.

    As Thomas's suggestion, before delving into the representation of the information, we firstly identify what the contents of the different signaling packets are, and in addition, what the data structures they may use.=A0
    I would like to take the commands defined in=A0draft-wang-6tsch-6top-00 as starting point. Here are the parameters in those commands.

    //integer
    (1) xxxID, e.g. TrackID, SlotframeID
    (2) xxxOffset, e.g. SlotOffset
    (3) NumOfxxx/Length
    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0
    (5) Status
    (6) ASN (5Byte integer), e.g. last time when a packet received from a neighbor

    //string
    (7) L2 address
    (8) SecurityKey

    //bitmap
    (9) LinkOption

    //floating
    (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics

    Maybe something else........

    Now, we can evaluate different representation methods. What do you think?

    Thanks
    Qin


    =A0=A0


    ________________________________________=
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6tsch@ietf.org
h=
ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
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    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch






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    6tsch@ietf.org
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    --047d7b6d95e6bdb00104e4895ad3-- From qinwang@berkeley.edu Thu Aug 22 07:57:09 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7B46D11E80F6 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 07:57:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.958 X-Spam-Level: X-Spam-Status: No, score=-2.958 tagged_above=-999 required=5 tests=[AWL=0.018, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LtAKJqPgRvEl for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 07:57:05 -0700 (PDT) Received: from mail-ve0-f177.google.com (mail-ve0-f177.google.com [209.85.128.177]) by ietfa.amsl.com (Postfix) with ESMTP id A5FB411E814C for <6tsch@ietf.org>; Thu, 22 Aug 2013 07:57:00 -0700 (PDT) Received: by mail-ve0-f177.google.com with SMTP id cz11so1570032veb.8 for <6tsch@ietf.org>; Thu, 22 Aug 2013 07:56:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=UT1LUyyjylKAhjWQscska8U8XBcR1tVkHlWoPTMQiRc=; b=DXPzYTj60i/mKfGF9ntJQdcElnygs8/IgguWeF7gGFwb4UmBe+6asH8+OZPmO2aPSo G8vpHWntdzes+HyVt2u1tHUtoTGAUDuzAUeyB2lCpEnV5nMGh0BrTI236wNCUm7Tv7l3 yTO66T+kNcVI6i6ZHXzTdgCtfevXITd0RenF2dSAZJlIl6xdG2L6zlnwBY4ngZg+f66e MN5ioi/+jWTnGOQ9kB8FK20xMQZjIrSgf+4A/xLnQYV7Ngz3enT9j4GTmvq8Ot10CLJU QCOjeHDz00BVn5TnUaIvxTM0s+qJqq/iAvmt2auIrWDivLi4at78HGhPfhrrFUFY2pez k1+g== X-Gm-Message-State: ALoCoQnc/goGX5rg+iiQ4HOaKHzro/63K3BjJYn0ShipTE06F9e/fles/cxNY3ksyAQ8w2tTDUsB MIME-Version: 1.0 X-Received: by 10.58.97.138 with SMTP id ea10mr117810veb.38.1377183419035; Thu, 22 Aug 2013 07:56:59 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 22 Aug 2013 07:56:58 -0700 (PDT) In-Reply-To: References: Date: Thu, 22 Aug 2013 22:56:58 +0800 Message-ID: From: Qin Wang To: Xavier Vilajosana Guillen Content-Type: multipart/alternative; boundary=089e013a28607b7bf104e48a80dd Cc: Thomas Watteyne , "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 14:57:09 -0000 --089e013a28607b7bf104e48a80dd Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi All, I think we likely mix the concepts in the two layers, i.e. 15.4e TSCH and RPL. The Join Priority is existing in a TSCH network and maintained by TSCH, no matter RPL is used as upper layer or not. Thus, IMHO, 6top and upper layer can use the Join Priority, but cannot modify it. In addition, selecting time source parent is for synchronizing to existing network and communicating with neighbors in correct time template, which should happen before a DODAG is established. Thus, I agree with Xavi that it is necessary to select a time source parent, or called it as temporary time source parent, before a DODAG is established. What do you think? Qin On Thu, Aug 22, 2013 at 9:33 PM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi Pascal, > > my comment inline: > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0.**** > > Q: Do we really need to build the time sync tree faster than the RPL grap= h? > **** > > ** ** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly? > > yes that would work but we are doing the same as the IEEE802-15.4e Join > priority field is for. The 15.4e defines this mechanism and it is inheren= t > to the networks we address so using it is straightforward. Then as > described by Thomas, we only need to use RPL best parent as soon as we ha= ve > one instead of the lowest prio neighbor. > > Another question with time sources is the selection of a time source > parent in the case that a node belongs to more than one DODAG. Which pare= nt > is selected then? An more importantly, do the basic draft considers havin= g > more than one DODAG? > > thanks! > Xavi > > > On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote: > >> Dear all:**** >> >> ** ** >> >> As you know, RPL may entail temporary loops, in particular if >> DAGMaxRankIncrease is not configured to 0.**** >> >> If as we expect we use the RPL preferred parent tree for time sync, this >> will lead to time sync loops. **** >> >> Two questions here:**** >> >> 1) how bad is the effect of such loop? I expect that the clocks will >> derive rapidly, as if from the perspective of a node the crystal was rea= l, >> real bad.**** >> >> 2) can we detect that effect and use it to detect a loop in the routing?= * >> *** >> >> ** ** >> >> Please see inline:**** >> >> ** ** >> >> sch] time parent selection based on EB priority**** >> >> ** ** >> >> Qin, Xavi,**** >> >> ** ** >> >> Excellent point. I believe that this is exactly what makes this 6TSCH >> work so interesting: figuring out how consolidate the views between uppe= r >> and lower layers.**** >> >> ** ** >> >> In my mind, the join priority as you describe looks very much like a >> DAGrank. I believe there are, however, two potential questions we should >> not forget:**** >> >> - what if the joining mote does no get all of the EBs of its neighbor?**= * >> * >> >> - what happens when the topology changes and a node moves up or down in >> the DODAG?**** >> >> ** ** >> >> I would suggest the following:**** >> >> - once the node has fully joined, somehow tie the join priority to its >> RPL DAGrank. We might have to play with the metric to make the join >> priority look like a hop count, but I believe it is important the announ= ced >> join priority changes when the mote moves up/down in the topology.**** >> >> - maybe consider the time source parent identified during the joining as >> temporary until the final time source parent is discovered. How the fina= l >> one is discovered can through some command from the ME (see Qin's >> attachement), or after receiving many DIOs.**** >> >> ** ** >> >> [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to= do >> like an hop-count-based OF0. **** >> >> Q: Do we really need to build the time sync tree faster than the RPL >> graph? **** >> >> ** ** >> >> If no, maybe me could use the priority as a boolean to mean that the nod= e >> is already part of the RPL DAG and may be used as time source.**** >> >> Initially only the root would be priority 0. All the others would be >> default 1.**** >> >> From there, all nodes that are one hop away from root with good RSSI can >> sync with the root, and listen to DIOs, and emit their own, and set thei= r >> own priority to zero.**** >> >> Children sync to whichever prio 0 neighbor as time source, listen to >> DIOs, select a parent, migrate to that parent as time source, and then c= an >> set their own priority to zero and send DIOs.**** >> >> Would that fly?**** >> >> Cheers,**** >> >> Pascal**** >> >> ** ** >> >> On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang wrote:*= * >> ** >> >> Agree!**** >> >> ** ** >> >> Qin**** >> >> ** ** >> >> On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote:**** >> >> HI Qin, >> >> as a basic setting we want the most basic approach. I guess that using >> (1) first priority and then RSSi will avoid having loops. As you say all >> this approaches would work but I bet for (1) to be the simplest. **** >> >> cheers! >> X**** >> >> ** ** >> >> On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote:= * >> *** >> >> Hi Xavi,**** >> >> ** ** >> >> It is a good idea to use Priority in EB as a factor to choose initial >> time parent. But, I think there are several ways to use the Priority, an= d >> other metrics like RSSI. For example,**** >> >> ** ** >> >> (1) As you suggested, use Priority first, and then RSSI**** >> >> (2) or use RSSI first, and then Priority**** >> >> (3) or use a function of Priority and RSSI.**** >> >> ** ** >> >> I'm not sure which is better. What do you think?**** >> >> ** ** >> >> Qin**** >> >> ** ** >> >> ** ** >> >> On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote:**** >> >> Hi all, >> >> I want to propose to add in the basic TSCH draft the fact that when a >> node joins a network, it uses the EB join priority defined in the Slot a= nd >> Link IE (Section 5.2.4.13 15.4e std) to select its time parent. This >> priority is 0 for the PAN coordinator of the network. A node listening >> several EB selects as a time parent the node with lowest EB Join Priorit= y. >> In case of receiving multiple EBs with the same Join priority then filte= rs >> by other metrics e.g RSSI of the link. (note that until a DIO is receive= d >> nodes don not know about the gradient).**** >> >> A node when sends an EB uses the lowest EB Join priority it has heard an= d >> adds 1 to it as its own Join priority. >> >> >> Current draft section states that RSSI or another metric should be used >> to select the initial time parent, this has the problem that loops canno= t >> be avoided until the first DIO is received. With the proposed approach t= he >> problem is solved and does not introduce anything new, just used what 15= .4e >> provides to us.**** >> >> what is your opinion?**** >> >> thanks! >> Xavi**** >> >> ** ** >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> ** ** >> >> ** ** >> >> ** ** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> ** ** >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --089e013a28607b7bf104e48a80dd Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi All,

    I think we likely mix the conce= pts in the two layers, i.e. 15.4e TSCH and RPL. The Join Priority is existi= ng in a TSCH network and maintained by TSCH, no matter RPL is used as upper= layer or not. Thus, IMHO, 6top and upper layer can use the Join Priority, = but cannot modify it.=A0

    In addition, selecting time source parent is for synchr= onizing to existing network and communicating with neighbors in correct tim= e template, which should happen before a DODAG is established. Thus, I agre= e with Xavi that it is necessary to select a time source parent, or called = it as temporary time source parent, before a DODAG is established.

    What do you think?

    Qin






    On Thu, Aug 22, 2013= at 9:33 PM, Xavier Vilajosana Guillen <xvilajosana@eecs.berke= ley.edu> wrote:
    Hi Pascal,

    my comment inline:

    [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel t= o RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time sync tree faster than the= RPL graph?

    =A0

    If no, maybe me could use the priority as a boolean to mean that= the node is already part of the RPL DAG and may be used as time source.=

    Initially only the root would be priority 0. All the others woul= d be default 1.

    From there, all nodes th= at are one hop away from root with good RSSI can sync with the root, and li= sten to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neighbor as time source, liste= n to DIOs, select a parent, migrate to that parent as time source, and then= can set their own priority to zero and send DIOs.

    Would that fly?

    yes that would work bu= t we are doing the same as the IEEE802-15.4e Join priority field is for. Th= e 15.4e defines this mechanism and it is inherent to the networks we addres= s so using it is straightforward. Then as described by Thomas, we only need= to use RPL best parent as soon as we have one instead of the lowest prio n= eighbor.=A0

    Another question with time sources is the selection of a time sou= rce parent in the case that a node belongs to more than one DODAG. Which pa= rent is selected then? An more importantly, do the basic draft considers ha= ving more than one DODAG?=A0

    thanks!
    Xavi



    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) <pthube= rt@cisco.com> wrote:

    Dear all:

    =A0<= /p>

    As you know, RPL may enta= il temporary loops, in particular if DAGMaxRankIncrease is not configured t= o 0.

    If as we expect we use th= e RPL preferred parent tree for time sync, this will lead to time sync loop= s.

    Two questions here:

    1) how bad is the effect = of such loop? I expect that the clocks=A0 will derive rapidly, as if from t= he perspective of a node the crystal was real, real bad.

    2) can we detect that eff= ect and use it to detect a loop in the routing?

    =A0<= /p>

    Please see inline:=

    =A0<= /p>

    sch] time parent selection based on EB p= riority

    =A0

    Qin, Xavi,

    =A0

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

    =A0

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

    =A0

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important t= he announced join priority changes when the mote moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME = (see Qin's attachement), or after receiving many DIOs.

    =A0<= /p>

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based = OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL= DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and lis= ten to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate = to that parent as time source, and then can set their own priority to zero and send DIOs.

    Would that fly?

    Cheers,

    Pascal

    =A0

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!=

    =A0

    Qin

    =A0

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

    =A0

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

    =A0

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

    =A0

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

    =A0

    I'm not sure which is better. What do you think?=

    =A0

    Qin

    =A0

    =A0

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

    =A0

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --089e013a28607b7bf104e48a80dd-- From pthubert@cisco.com Thu Aug 22 08:11:54 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0F60211E81F0 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:11:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.448 X-Spam-Level: X-Spam-Status: No, score=-10.448 tagged_above=-999 required=5 tests=[AWL=0.150, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uPLSW2ue9Xbl for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:11:48 -0700 (PDT) Received: from rcdn-iport-9.cisco.com (rcdn-iport-9.cisco.com [173.37.86.80]) by ietfa.amsl.com (Postfix) with ESMTP id 05F3911E81E8 for <6tsch@ietf.org>; Thu, 22 Aug 2013 08:11:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=41838; q=dns/txt; s=iport; t=1377184308; x=1378393908; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=FamwFyQltvuB6bBlj9wZcg7g+xPEbzvuRm+nnFqLOKI=; b=CqcH/fMQEpeVe/N55Ym7GF/B90XY2eT6MXEW66wXj1YV77WgKt+f4fyb jZCoE19zNngdfPzobAWUewvvignmqoYq7LLANM1pvgPWA2O58X+PXfGtA bXRIXrBNY4MJYqz8rNbSg4C3DEUe56/2C1uVfuRu34MscBHu2H5WvoZB+ Q=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgoGACwpFlKtJV2Z/2dsb2JhbABaDoIzRDVRwAiBHRZtB4IkAQEBBAEBASpBCxACAQgRBAEBCxYBBgcnCxQJCAIEDgUIEYd3DK8PBJA1LQQGAYMbewOFSIMuilZBlTOCYD+BaSQe X-IronPort-AV: E=Sophos;i="4.89,934,1367971200"; d="scan'208,217";a="247493783" Received: from rcdn-core-2.cisco.com ([173.37.93.153]) by rcdn-iport-9.cisco.com with ESMTP; 22 Aug 2013 15:11:45 +0000 Received: from xhc-rcd-x02.cisco.com (xhc-rcd-x02.cisco.com [173.37.183.76]) by rcdn-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id r7MFBjl9000716 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 22 Aug 2013 15:11:45 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-rcd-x02.cisco.com ([173.37.183.76]) with mapi id 14.02.0318.004; Thu, 22 Aug 2013 10:11:45 -0500 From: "Pascal Thubert (pthubert)" To: "xvilajosana@eecs.berkeley.edu" Thread-Topic: [6tsch] time parent selection based on EB priority Thread-Index: AQHOnzxCMFHGqVyvakWoMoCUElRr4pmhTG+A Date: Thu, 22 Aug 2013 15:11:44 +0000 Deferred-Delivery: Thu, 22 Aug 2013 15:11:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.49.80.24] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD84142778Cxmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 15:11:54 -0000 --_000_E045AECD98228444A58C61C200AE1BD84142778Cxmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Xavi: The problem is that we have 2 mechanisms that establish a distance to the r= oot in order to avoid loops, RPL Rank and 4e priority. Fact is, RPL is probably more elaborate for loop detection and loop avoidan= ce. I suspect that the priority can easily count to infinity. So I'd trust RPL Rank rather than priority, and we seem to agree that we wa= nt to time sync with RPL parents. a) My question is whether it makes sense and value to have a transition bet= ween a time source based on best (hop count) priority and to one based on b= est RPL Rank, or if we could use the rank right away. Seems to me that life= would be easier if we use the Rank right away, though it may make the netw= ork a bit slower to come up. Passing from one mode to the other will demand= some specifications, what if one node reboots and goes from one mode to th= e other, etc... Now if the question is to reuse the priority field, then we can do actually= change the logic to accommodate priority =3D DAGRank(Rank) for nodes that = are not root, still ensuring that only a node that is already part of a RPL= DAG may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255) >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to DAGRank(Rank) that is < 255. Children sync to whichever prio < 255 neighbor as time source, listen to DI= Os, select a parent, migrate to that parent as time source, and then can se= t their own priority to zero and send DIOs. If later they select a better p= arent the priority will get lower so that's till OK. Would that fly? b) about multiple DAGs, there are 2 cases: - 2 DODAGs in a same instance. We said we want to support that, and that im= plies that the various DODAGs are closely time sync'd. - 2 DODAGs in 2 different instances. To be discussed. We have use cases whe= re that could be useful, one instance playing basic slotted aloha and the o= ther doing more critical jobs. We have not agreed on the latter but with a single radio, it seems problema= tic if the 2 instances do not share a same sense of time. We'd end up with = slot frames that may drift from one another, sometimes overlapping... I sus= pect that we'd partition time inside a slot frame or using multiple slot fr= ames, but we'd keep them in sync. Probably there is a need for a spanning i= nstance (0) for (autonomic) management etc... that uses something very simp= le, always on, very much like your basic draft. If there is such a spanning= instance, then it can be used to sync everyone, in which casethe Rank from= the dependent instances is not used for time sync. What do others think? Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: jeudi 22 ao=FBt 2013 15:34 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi Pascal, my comment inline: [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? yes that would work but we are doing the same as the IEEE802-15.4e Join pri= ority field is for. The 15.4e defines this mechanism and it is inherent to = the networks we address so using it is straightforward. Then as described b= y Thomas, we only need to use RPL best parent as soon as we have one instea= d of the lowest prio neighbor. Another question with time sources is the selection of a time source parent= in the case that a node belongs to more than one DODAG. Which parent is se= lected then? An more importantly, do the basic draft considers having more = than one DODAG? thanks! Xavi On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) > wrote: Dear all: As you know, RPL may entail temporary loops, in particular if DAGMaxRankInc= rease is not configured to 0. If as we expect we use the RPL preferred parent tree for time sync, this wi= ll lead to time sync loops. Two questions here: 1) how bad is the effect of such loop? I expect that the clocks will deriv= e rapidly, as if from the perspective of a node the crystal was real, real = bad. 2) can we detect that effect and use it to detect a loop in the routing? Please see inline: sch] time parent selection based on EB priority Qin, Xavi, Excellent point. I believe that this is exactly what makes this 6TSCH work = so interesting: figuring out how consolidate the views between upper and lo= wer layers. In my mind, the join priority as you describe looks very much like a DAGran= k. I believe there are, however, two potential questions we should not forg= et: - what if the joining mote does no get all of the EBs of its neighbor? - what happens when the topology changes and a node moves up or down in the= DODAG? I would suggest the following: - once the node has fully joined, somehow tie the join priority to its RPL = DAGrank. We might have to play with the metric to make the join priority lo= ok like a hop count, but I believe it is important the announced join prior= ity changes when the mote moves up/down in the topology. - maybe consider the time source parent identified during the joining as te= mporary until the final time source parent is discovered. How the final one= is discovered can through some command from the ME (see Qin's attachement)= , or after receiving many DIOs. [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? Cheers, Pascal On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang > wrote: Agree! Qin On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen > wrote: HI Qin, as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest. cheers! X On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang > wrote: Hi Xavi, It is a good idea to use Priority in EB as a factor to choose initial time = parent. But, I think there are several ways to use the Priority, and other = metrics like RSSI. For example, (1) As you suggested, use Priority first, and then RSSI (2) or use RSSI first, and then Priority (3) or use a function of Priority and RSSI. I'm not sure which is better. What do you think? Qin On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen > wrote: Hi all, I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB sele= cts as a time parent the node with lowest EB Join Priority. In case of rece= iving multiple EBs with the same Join priority then filters by other metric= s e.g RSSI of the link. (note that until a DIO is received nodes don not kn= ow about the gradient). A node when sends an EB uses the lowest EB Join priority it has heard and a= dds 1 to it as its own Join priority. Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e pro= vides to us. what is your opinion? thanks! Xavi _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD84142778Cxmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hello Xavi:

     <= /p>

    The problem is that we ha= ve 2 mechanisms that establish a distance to the root in order to avoid loo= ps, RPL Rank and 4e priority.

    Fact is, RPL is probably = more elaborate for loop detection and loop avoidance. I suspect that the pr= iority can easily count to infinity.

    So I’d trust RPL Ra= nk rather than priority, and we seem to agree that we want to time sync wit= h RPL parents.

     <= /p>

    a) My question is whether= it makes sense and value to have a transition between a time source based = on best (hop count) priority and to one based on best RPL Rank, or if we could use the rank right away. Seems to me that life would = be easier if we use the Rank right away, though it may make the network a b= it slower to come up. Passing from one mode to the other will demand some s= pecifications, what if one node reboots and goes from one mode to the other, etc…<= /p>

     <= /p>

    Now if the question is to= reuse the priority field, then we can do actually change the logic to acco= mmodate priority =3D DAGRank(Rank) for nodes that are not root= , still ensuring that only a node that is already part of a RPL DAG may be = used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255)

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to DAGRank(= Rank) that is < 255.

    Children sync to whichever prio < 25= 5 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs. If later they select a better parent the priority will get = lower so that’s till OK.

    Would that fly?<= /span>

    b) about multiple DAGs, t= here are 2 cases:

    - 2 DODAGs in a same inst= ance. We said we want to support that, and that implies that the various DO= DAGs are closely time sync’d.

    - 2 DODAGs in 2 different= instances. To be discussed. We have use cases where that could be useful, = one instance playing basic slotted aloha and the other doing more critical jobs.

     <= /p>

    We have not agreed on the= latter but with a single radio, it seems problematic if the 2 instances do= not share a same sense of time. We’d end up with slot frames that may drift from one another, sometimes overlapping… I suspect th= at we’d partition time inside a slot frame or using multiple slot fra= mes, but we’d keep them in sync. Probably there is a need for a spann= ing instance (0) for (autonomic) management etc… that uses something very simple, always on, very much like your basic draft. If= there is such a spanning instance, then it can be used to sync everyone, i= n which casethe Rank from the dependent instances is not used for time sync= .

    What do others think?

     <= /p>

    Pascal<= /p>

     <= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority=

     

    Hi Pascal,

     

    my comment inline:

     

    [Pascal] Yes, I read Xavi’s propo= sal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time = sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority = as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 1.

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neigh= bor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?<= /span>

    yes that would work but we are doing the same as the IEEE802-15.= 4e Join priority field is for. The 15.4e defines this mechanism and it is inherent to the networks we address so using it is straightforwa= rd. Then as described by Thomas, we only need to use RPL best parent as soo= n as we have one instead of the lowest prio neighbor. 

    Another question with time sources is the selection of a time so= urce parent in the case that a node belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic dr= aft considers having more than one DODAG? 

    thanks!
    Xavi

     

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pth= ubert) <pthubert= @cisco.com> wrote:

    Dear all:

     

    As you know, RPL may entail temporary l= oops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use the RPL preferre= d parent tree for time sync, this will lead to time sync loops.

    Two questions here:

    1) how bad is the effect of such loop? = I expect that the clocks  will derive rapidly, as if from the perspective of a node the crystal was real, real bad.

    2) can we detect that effect and use it= to detect a loop in the routing?

     

    Please see inline:

     

    sch] time parent selection based on EB priority=

     

    Qin, Xavi,

     

    Excellent point. I believe that this is exactly what makes this 6T= SCH work so interesting: figuring out how consolidate the views between upp= er and lower layers.

     

    In my mind, the join priority as you describe looks very much like= a DAGrank. I believe there are, however, two potential questions we should= not forget:

    - what if the joining mote does no get all of the EBs of its neigh= bor?

    - what happens when the topology changes and a node moves up or do= wn in the DODAG?

     

    I would suggest the following:

    - once the node has fully joined, somehow tie the join priority to= its RPL DAGrank. We might have to play with the metric to make the join pr= iority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified during the join= ing as temporary until the final time source parent is discovered. How the = final one is discovered can through some command from the ME (see Qin's attachement), or after receiving many = DIOs.

     

    [Pascal] Yes, I read Xavi’s propo= sal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time = sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority = as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 1.

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neigh= bor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

     

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

     

    Qin

     

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

     

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:<= o:p>

    Hi Xavi,

     

    It is a good idea to use Priority in EB as a factor to choose init= ial time parent. But, I think there are several ways to use the Priority, a= nd other metrics like RSSI. For example,

     

    (1) As you suggested, use Priority first, and then RSSI=

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

     

    I'm not sure which is better. What do you think?

     

    Qin

     

     

    On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an EB uses the lowest EB Join priority it has heard an= d adds 1 to it as its own Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

     

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_E045AECD98228444A58C61C200AE1BD84142778Cxmbrcdx01ciscoc_-- From rsudhaak@cisco.com Thu Aug 22 08:26:38 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 26EA011E81DB for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:26:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8lZERAZpkqr3 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:26:33 -0700 (PDT) Received: from rcdn-iport-5.cisco.com (rcdn-iport-5.cisco.com [173.37.86.76]) by ietfa.amsl.com (Postfix) with ESMTP id 7798211E80D5 for <6tsch@ietf.org>; Thu, 22 Aug 2013 08:26:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=30063; q=dns/txt; s=iport; t=1377185192; x=1378394792; h=from:to:cc:subject:date:message-id:in-reply-to: mime-version; bh=oJzozSxkiYs5pANPmzoutZ1ZzJpB+7LwgrBZ6kZynUw=; b=doEigG1vJxzCv1EPwIJoDgl1DABnQupx5q/QH1vywe8QsiWpfbVp3Vyy jEuF4ZwXYXZbW1xZF4DewMasLNp0MP/phFoDwwqv0njeiiGTy01zKncpJ OXKJJ76/RsU9BAY6TYZ4zCNdXtwqlLoT4RxvV7/+F+hLxz66jA7lxzpt6 Q=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqIFAKUsFlKtJV2c/2dsb2JhbABaDoIzRDVRwAiBHRZ0giQBAQEEAQEBawsSAQgRAwECCxYHLgsUCQgCBAENBQiICAyvGgSQNSANBAeDG3sDhUiOBJV0gmA/gWkkHg X-IronPort-AV: E=Sophos;i="4.89,934,1367971200"; d="scan'208,217";a="250498035" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by rcdn-iport-5.cisco.com with ESMTP; 22 Aug 2013 15:26:31 +0000 Received: from xhc-aln-x05.cisco.com (xhc-aln-x05.cisco.com [173.36.12.79]) by rcdn-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id r7MFQV9e021155 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 22 Aug 2013 15:26:31 GMT Received: from xmb-rcd-x04.cisco.com ([169.254.8.201]) by xhc-aln-x05.cisco.com ([173.36.12.79]) with mapi id 14.02.0318.004; Thu, 22 Aug 2013 10:26:31 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: Qin Wang , Xavier Vilajosana Guillen Thread-Topic: [6tsch] time parent selection based on EB priority Thread-Index: AQHOn0v6dNmovl53kUyE3l/EwFVRnQ== Date: Thu, 22 Aug 2013 15:26:31 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A036@xmb-rcd-x04.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.154.213.84] Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A036xmbrcdx04ciscoc_" MIME-Version: 1.0 Cc: Thomas Watteyne , "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 15:26:38 -0000 --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A036xmbrcdx04ciscoc_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi All, Wont allowing RPL tree to influence L2 timing parent may create race condit= ions? For example, If the parent node switches off, the L2 may lose time sync (this will happe= n with a bad crystal in low traffic scenarios) very soon. The entire subtre= e may not be able to connect with other nodes at L2 and hence L3 may never = be able to converge. I know we discussed the advantages of using the L3 parent as the timing par= ent previously. But I think such race conditions will be an unnecessary art= ifact and probably a more serious problem. Given this, I think timing parent selection should be completely owned by L= 2 using its own parameters. Anyway, timing parent is in no way required to = be known by L3 nor does it affect routing. -raghuram From: Qin Wang > Date: Thursday, August 22, 2013 7:56 AM To: Xavier Vilajosana Guillen > Cc: Thomas Watteyne >, "Pascal Thubert (pthubert)" >, "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority Hi All, I think we likely mix the concepts in the two layers, i.e. 15.4e TSCH and R= PL. The Join Priority is existing in a TSCH network and maintained by TSCH,= no matter RPL is used as upper layer or not. Thus, IMHO, 6top and upper la= yer can use the Join Priority, but cannot modify it. In addition, selecting time source parent is for synchronizing to existing = network and communicating with neighbors in correct time template, which sh= ould happen before a DODAG is established. Thus, I agree with Xavi that it = is necessary to select a time source parent, or called it as temporary time= source parent, before a DODAG is established. What do you think? Qin On Thu, Aug 22, 2013 at 9:33 PM, Xavier Vilajosana Guillen > wrote: Hi Pascal, my comment inline: [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to do= like an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? yes that would work but we are doing the same as the IEEE802-15.4e Join pri= ority field is for. The 15.4e defines this mechanism and it is inherent to = the networks we address so using it is straightforward. Then as described b= y Thomas, we only need to use RPL best parent as soon as we have one instea= d of the lowest prio neighbor. Another question with time sources is the selection of a time source parent= in the case that a node belongs to more than one DODAG. Which parent is se= lected then? An more importantly, do the basic draft considers having more = than one DODAG? thanks! Xavi On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) > wrote: Dear all: As you know, RPL may entail temporary loops, in particular if DAGMaxRankInc= rease is not configured to 0. If as we expect we use the RPL preferred parent tree for time sync, this wi= ll lead to time sync loops. Two questions here: 1) how bad is the effect of such loop? I expect that the clocks will deriv= e rapidly, as if from the perspective of a node the crystal was real, real = bad. 2) can we detect that effect and use it to detect a loop in the routing? Please see inline: sch] time parent selection based on EB priority Qin, Xavi, Excellent point. I believe that this is exactly what makes this 6TSCH work = so interesting: figuring out how consolidate the views between upper and lo= wer layers. In my mind, the join priority as you describe looks very much like a DAGran= k. I believe there are, however, two potential questions we should not forg= et: - what if the joining mote does no get all of the EBs of its neighbor? - what happens when the topology changes and a node moves up or down in the= DODAG? I would suggest the following: - once the node has fully joined, somehow tie the join priority to its RPL = DAGrank. We might have to play with the metric to make the join priority lo= ok like a hop count, but I believe it is important the announced join prior= ity changes when the mote moves up/down in the topology. - maybe consider the time source parent identified during the joining as te= mporary until the final time source parent is discovered. How the final one= is discovered can through some command from the ME (see Qin's attachement)= , or after receiving many DIOs. [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to do= like an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? Cheers, Pascal On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang > wrote: Agree! Qin On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen > wrote: HI Qin, as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest. cheers! X On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang > wrote: Hi Xavi, It is a good idea to use Priority in EB as a factor to choose initial time = parent. But, I think there are several ways to use the Priority, and other = metrics like RSSI. For example, (1) As you suggested, use Priority first, and then RSSI (2) or use RSSI first, and then Priority (3) or use a function of Priority and RSSI. I'm not sure which is better. What do you think? Qin On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen > wrote: Hi all, I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB sele= cts as a time parent the node with lowest EB Join Priority. In case of rece= iving multiple EBs with the same Join priority then filters by other metric= s e.g RSSI of the link. (note that until a DIO is received nodes don not kn= ow about the gradient). A node when sends an EB uses the lowest EB Join priority it has heard and a= dds 1 to it as its own Join priority. Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e pro= vides to us. what is your opinion? thanks! Xavi _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A036xmbrcdx04ciscoc_ Content-Type: text/html; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: quoted-printable
    Hi All,
    Wont allowing RPL tree to influence L2 timing parent may create race c= onditions? 

    For example, 
    If the parent node switches off, the L2 may lose time sync (this will = happen with a bad crystal in low traffic scenarios) very soon. The entire s= ubtree may not be able to connect with other nodes at L2 and hence L3 may n= ever be able to converge. 

    I know we discussed the advantages of using the L3 parent as the timin= g parent previously. But I think such race conditions will be an unnecessar= y artifact and probably a more serious problem.

    Given this, I think timing parent selection should be completely owned= by L2 using its own parameters. Anyway, timing parent is in no way require= d to be known by L3 nor does it affect routing.

    -raghuram

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 22, 2013 7:5= 6 AM
    To: Xavier Vilajosana Guillen <<= a href=3D"mailto:xvilajosana@eecs.berkeley.edu">xvilajosana@eecs.berkeley.e= du>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, &quo= t;Pascal Thubert (pthubert)" <pthubert@cisco.com>, "6tsch@= ietf.org" <6tsch@ietf.org>
    Subject: Re: [6tsch] time parent se= lection based on EB priority

    Hi All,

    I think we likely mix the concepts in the two layers, i.e. 15.4e TSCH = and RPL. The Join Priority is existing in a TSCH network and maintained by = TSCH, no matter RPL is used as upper layer or not. Thus, IMHO, 6top and upp= er layer can use the Join Priority, but cannot modify it. 

    In addition, selecting time source parent is for synchronizing to exis= ting network and communicating with neighbors in correct time template, whi= ch should happen before a DODAG is established. Thus, I agree with Xavi tha= t it is necessary to select a time source parent, or called it as temporary time source parent, before a DODA= G is established.

    What do you think?

    Qin






    On Thu, Aug 22, 2013 at 9:33 PM, Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Pascal,

    my comment inline:

    [Pascal] Yes, I read Xavi=92s proposal as a mechanism = parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time sync tree faste= r than the RPL graph?

     

    If no, maybe me could use the priority as a boolean to= mean that the node is already part of the RPL DAG and may be used as time = source.

    Initially only the root would be priority 0. All the o= thers would be default 1.

    From there, all nodes that are one hop away from root = with good RSSI can sync with the root, and listen to DIOs, and emit their o= wn, and set their own priority to zero.

    Children sync to whichever prio 0 neighbor as time sou= rce, listen to DIOs, select a parent, migrate to that parent as time source= , and then can set their own priority to zero and send DIOs.

    Would that fly?

    yes that would work but we are doing the same as the IEEE802-15.4e= Join priority field is for. The 15.4e defines this mechanism and it is inh= erent to the networks we address so using it is straightforward. Then as described by Thomas, we only need to use RP= L best parent as soon as we have one instead of the lowest prio neighbor.&n= bsp;

    Another question with time sources is the selection of a time sour= ce parent in the case that a node belongs to more than one DODAG. Which par= ent is selected then? An more importantly, do the basic draft considers having more than one DODAG? 

    thanks!
    Xavi



    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert = (pthubert) <pthubert@cisco.com> wrote:

    Dear all:

     

    As you know, RPL may entail tempor= ary loops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use the RPL pre= ferred parent tree for time sync, this will lead to time sync loops.

    Two questions here:<= /span>

    1) how bad is the effect of such l= oop? I expect that the clocks  will derive rapidly, as if from the per= spective of a node the crystal was real, real bad.

    2) can we detect that effect and u= se it to detect a loop in the routing?

     

    Please see inline:

     

    sch] time parent selection based on EB priority

     

    Qin, Xavi,

     

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

     

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

     

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important t= he announced join priority changes when the mote moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME = (see Qin's attachement), or after receiving many DIOs.

     

    [Pascal] Yes, I read Xavi=92s prop= osal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the = time sync tree faster than the RPL graph?

     

    If no, maybe me could use the prio= rity as a boolean to mean that the node is already part of the RPL DAG and = may be used as time source.

    Initially only the root would be p= riority 0. All the others would be default 1.

    From there, all nodes that are one= hop away from root with good RSSI can sync with the root, and listen to DI= Os, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 = neighbor as time source, listen to DIOs, select a parent, migrate to that p= arent as time source, and then can set their own priority to zero and send DIOs.

    Wou= ld that fly?

    Che= ers,

    Pas= cal

    =  

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!=

     

    Qin

     <= /p>

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

     <= /p>

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

     

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

     

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

     

    I'm not sure which is better. What do you think?<= /u>

     

    Qin

     

     <= /p>

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

     

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     --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A036xmbrcdx04ciscoc_-- From pthubert@cisco.com Thu Aug 22 08:27:59 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0042B21F94FA for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:27:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.498 X-Spam-Level: X-Spam-Status: No, score=-10.498 tagged_above=-999 required=5 tests=[AWL=0.100, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zq82QH2Waf5b for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:27:45 -0700 (PDT) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id E081321F841B for <6tsch@ietf.org>; Thu, 22 Aug 2013 08:27:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=35621; q=dns/txt; s=iport; t=1377185265; x=1378394865; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=wBPxt896YLHX8zSyCJvEpJBMHT22Atj5IGn6leBsIDw=; b=E8p6x3yFjRhalI7lWQjKgRsEHgVgqE18YZVuygkIwr4PddtisHJ24/rT gQWWYYQmdwZ5ot3LPfZ+HPosRvlEPoa3LflaaxC9/bqmPc25ET5iNEukt 5WaX1Z2xqTseLKmdln0yfkNLm7dn8V13SFbfMF+gPocDw8/CfDi2Fi8r7 w=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqIFAJUtFlKtJV2d/2dsb2JhbABaDoIzRDVRwAiBHRZ0giQBAQEEAQEBKkELEAIBCBEEAQELFgEGBycLFAkIAgQBDQUIiAgMrxsEkDUtBAYBgxt7A4VIgy6KVpV0gmA/gWkkHg X-IronPort-AV: E=Sophos;i="4.89,934,1367971200"; d="scan'208,217";a="250307472" Received: from rcdn-core-6.cisco.com ([173.37.93.157]) by rcdn-iport-1.cisco.com with ESMTP; 22 Aug 2013 15:27:40 +0000 Received: from xhc-rcd-x02.cisco.com (xhc-rcd-x02.cisco.com [173.37.183.76]) by rcdn-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id r7MFReTn032231 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 22 Aug 2013 15:27:40 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-rcd-x02.cisco.com ([173.37.183.76]) with mapi id 14.02.0318.004; Thu, 22 Aug 2013 10:27:39 -0500 From: "Pascal Thubert (pthubert)" To: Qin Wang , Xavier Vilajosana Guillen Thread-Topic: [6tsch] time parent selection based on EB priority Thread-Index: AQHOn0fZMFHGqVyvakWoMoCUElRr4pmhV7fw Date: Thu, 22 Aug 2013 15:27:39 +0000 Deferred-Delivery: Thu, 22 Aug 2013 15:27:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.49.80.24] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD841427846xmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 15:27:59 -0000 --_000_E045AECD98228444A58C61C200AE1BD841427846xmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Qin: Do you think you need to sync the whole network before RPL DIO/parent selec= tion happens or should we make it so that we sync only with nodes that are = already in the DODAG? Pascal From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: jeudi 22 ao=FBt 2013 16:57 To: Xavier Vilajosana Guillen Cc: Pascal Thubert (pthubert); Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi All, I think we likely mix the concepts in the two layers, i.e. 15.4e TSCH and R= PL. The Join Priority is existing in a TSCH network and maintained by TSCH,= no matter RPL is used as upper layer or not. Thus, IMHO, 6top and upper la= yer can use the Join Priority, but cannot modify it. In addition, selecting time source parent is for synchronizing to existing = network and communicating with neighbors in correct time template, which sh= ould happen before a DODAG is established. Thus, I agree with Xavi that it = is necessary to select a time source parent, or called it as temporary time= source parent, before a DODAG is established. What do you think? Qin On Thu, Aug 22, 2013 at 9:33 PM, Xavier Vilajosana Guillen > wrote: Hi Pascal, my comment inline: [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? yes that would work but we are doing the same as the IEEE802-15.4e Join pri= ority field is for. The 15.4e defines this mechanism and it is inherent to = the networks we address so using it is straightforward. Then as described b= y Thomas, we only need to use RPL best parent as soon as we have one instea= d of the lowest prio neighbor. Another question with time sources is the selection of a time source parent= in the case that a node belongs to more than one DODAG. Which parent is se= lected then? An more importantly, do the basic draft considers having more = than one DODAG? thanks! Xavi On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) > wrote: Dear all: As you know, RPL may entail temporary loops, in particular if DAGMaxRankInc= rease is not configured to 0. If as we expect we use the RPL preferred parent tree for time sync, this wi= ll lead to time sync loops. Two questions here: 1) how bad is the effect of such loop? I expect that the clocks will deriv= e rapidly, as if from the perspective of a node the crystal was real, real = bad. 2) can we detect that effect and use it to detect a loop in the routing? Please see inline: sch] time parent selection based on EB priority Qin, Xavi, Excellent point. I believe that this is exactly what makes this 6TSCH work = so interesting: figuring out how consolidate the views between upper and lo= wer layers. In my mind, the join priority as you describe looks very much like a DAGran= k. I believe there are, however, two potential questions we should not forg= et: - what if the joining mote does no get all of the EBs of its neighbor? - what happens when the topology changes and a node moves up or down in the= DODAG? I would suggest the following: - once the node has fully joined, somehow tie the join priority to its RPL = DAGrank. We might have to play with the metric to make the join priority lo= ok like a hop count, but I believe it is important the announced join prior= ity changes when the mote moves up/down in the topology. - maybe consider the time source parent identified during the joining as te= mporary until the final time source parent is discovered. How the final one= is discovered can through some command from the ME (see Qin's attachement)= , or after receiving many DIOs. [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? Cheers, Pascal On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang > wrote: Agree! Qin On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen > wrote: HI Qin, as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest. cheers! X On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang > wrote: Hi Xavi, It is a good idea to use Priority in EB as a factor to choose initial time = parent. But, I think there are several ways to use the Priority, and other = metrics like RSSI. For example, (1) As you suggested, use Priority first, and then RSSI (2) or use RSSI first, and then Priority (3) or use a function of Priority and RSSI. I'm not sure which is better. What do you think? Qin On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen > wrote: Hi all, I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB sele= cts as a time parent the node with lowest EB Join Priority. In case of rece= iving multiple EBs with the same Join priority then filters by other metric= s e.g RSSI of the link. (note that until a DIO is received nodes don not kn= ow about the gradient). A node when sends an EB uses the lowest EB Join priority it has heard and a= dds 1 to it as its own Join priority. Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e pro= vides to us. what is your opinion? thanks! Xavi _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD841427846xmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hello Qin:

     <= /p>

    Do you think you need to = sync the whole network before RPL DIO/parent selection happens or should we= make it so that we sync only with nodes that are already in the DODAG?

     <= /p>

    Pascal

     <= /p>

    From: Qin Wang= [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 16:57
    To: Xavier Vilajosana Guillen
    Cc: Pascal Thubert (pthubert); Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority=

     

    Hi All,

     

    I think we likely mix the concepts in the two layers= , i.e. 15.4e TSCH and RPL. The Join Priority is existing in a TSCH network = and maintained by TSCH, no matter RPL is used as upper layer or not. Thus, = IMHO, 6top and upper layer can use the Join Priority, but cannot modify it. 

     

    In addition, selecting time source parent is for syn= chronizing to existing network and communicating with neighbors in correct = time template, which should happen before a DODAG is established. Thus, I a= gree with Xavi that it is necessary to select a time source parent, or called it as temporary time source pare= nt, before a DODAG is established.

     

    What do you think?

     

    Qin

     

     

     

     

     

    On Thu, Aug 22, 2013 at 9:33 PM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    Hi Pascal,

     

    my comment inline:

     

    [Pascal] Yes, I read Xavi’s proposal as= a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time sync t= ree faster than the RPL graph?

     

    If no, maybe me could use the priority as a b= oolean to mean that the node is already part of the RPL DAG and may be used= as time source.

    Initially only the root would be priority 0. = All the others would be default 1.

    From there, all nodes that are one hop away f= rom root with good RSSI can sync with the root, and listen to DIOs, and emi= t their own, and set their own priority to zero.

    Children sync to whichever prio 0 neighbor as= time source, listen to DIOs, select a parent, migrate to that parent as ti= me source, and then can set their own priority to zero and send DIOs.

    Would that fly= ?

    yes that would work but we are do= ing the same as the IEEE802-15.4e Join priority field is for. The 15.4e def= ines this mechanism and it is inherent to the networks we address so using it is straightforward. Then as described by Thomas, we on= ly need to use RPL best parent as soon as we have one instead of the lowest= prio neighbor. 

    Another question with time source= s is the selection of a time source parent in the case that a node belongs = to more than one DODAG. Which parent is selected then? An more importantly, do the basic draft considers having more than one DODAG?=  

    thanks!
    Xavi

     

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pth= ubert) <pthubert= @cisco.com> wrote:

    Dear all:

     

    As you know, RPL may entail temporary l= oops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use the RPL preferre= d parent tree for time sync, this will lead to time sync loops.

    Two questions here:

    1) how bad is the effect of such loop? = I expect that the clocks  will derive rapidly, as if from the perspective of a node the crystal was real, real bad.

    2) can we detect that effect and use it= to detect a loop in the routing?

     

    Please see inline:

     

    sch] time parent selection based on EB priority=

     

    Qin, Xavi,

     

    Excellent point. I believe that this is exactly what makes this 6T= SCH work so interesting: figuring out how consolidate the views between upp= er and lower layers.

     

    In my mind, the join priority as you describe looks very much like= a DAGrank. I believe there are, however, two potential questions we should= not forget:

    - what if the joining mote does no get all of the EBs of its neigh= bor?

    - what happens when the topology changes and a node moves up or do= wn in the DODAG?

     

    I would suggest the following:

    - once the node has fully joined, somehow tie the join priority to= its RPL DAGrank. We might have to play with the metric to make the join pr= iority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified during the join= ing as temporary until the final time source parent is discovered. How the = final one is discovered can through some command from the ME (see Qin's attachement), or after receiving many = DIOs.

     

    [Pascal] Yes, I read Xavi’s propo= sal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time = sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority = as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 1.

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neigh= bor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

     

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

     

    Qin

     

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

     

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:<= o:p>

    Hi Xavi,

     

    It is a good idea to use Priority in EB as a factor to choose init= ial time parent. But, I think there are several ways to use the Priority, a= nd other metrics like RSSI. For example,

     

    (1) As you suggested, use Priority first, and then RSSI=

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

     

    I'm not sure which is better. What do you think?

     

    Qin

     

     

    On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an EB uses the lowest EB Join priority it has heard an= d adds 1 to it as its own Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

     

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_E045AECD98228444A58C61C200AE1BD841427846xmbrcdx01ciscoc_-- From qinwang@berkeley.edu Thu Aug 22 08:42:03 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7EA2211E81F9 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:42:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.959 X-Spam-Level: X-Spam-Status: No, score=-2.959 tagged_above=-999 required=5 tests=[AWL=0.017, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MBoNUunr5kxN for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:41:59 -0700 (PDT) Received: from mail-ve0-f175.google.com (mail-ve0-f175.google.com [209.85.128.175]) by ietfa.amsl.com (Postfix) with ESMTP id 5693A11E81DF for <6tsch@ietf.org>; Thu, 22 Aug 2013 08:41:51 -0700 (PDT) Received: by mail-ve0-f175.google.com with SMTP id oy10so1660100veb.34 for <6tsch@ietf.org>; Thu, 22 Aug 2013 08:41:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=uyDEkdNH+8nWpj9qhgP6TpWzB02UzAFJIeEcE63W4b0=; b=m7NS8/xGbeSTwImSeMH3JGF4xnBEGoNTQ0ET81eOuTA90E5DQsoqSu2GM5lrrAAiGQ JF57Oc7CKereMRqogxNZ/KbtD35FTCD09w7HziCGl9amraTJX1LuOkkOG2DDh4npqmbV 2xQwREhQG/xtSCW9TWlg+Vgme7zAY/Gbegk3CpRJIl6JXUplW/24S8/zYbvH5ZqZqnvD 2gLh8UOH/QAKDWI23pB+H9LiJWPLBW2pGpVQK6mjOTkhOfH/2wfdDwtZTDFHyOLI1HsN gWdq0glMSQJT3/TgzpDFGfDcMd/SFG+qImPzyJqp0KIOl34T2t4YUIKRagzKOFU9LQ18 MzsQ== X-Gm-Message-State: ALoCoQmEXfR6qW0oMoRalvkYrD9+sNCaAfCr339E1dEtiUx6awcviaWIfR20Rght8y0bYNMiUkLR MIME-Version: 1.0 X-Received: by 10.58.230.135 with SMTP id sy7mr31481vec.42.1377186107409; Thu, 22 Aug 2013 08:41:47 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 22 Aug 2013 08:41:47 -0700 (PDT) In-Reply-To: References: Date: Thu, 22 Aug 2013 23:41:47 +0800 Message-ID: From: Qin Wang To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=047d7bdc87beb8d19704e48b2091 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Xavier Vilajosana Guillen Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 15:42:03 -0000 --047d7bdc87beb8d19704e48b2091 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pascal, I think that selecting a temporary time source parent is for establishing a basic communication channel, on which DIOs can be received. Thus, a joining node only needs to sync with the nodes already in the DODAG. Make sense? Qin On Thu, Aug 22, 2013 at 11:27 PM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Hello Qin:**** > > ** ** > > Do you think you need to sync the whole network before RPL DIO/parent > selection happens or should we make it so that we sync only with nodes th= at > are already in the DODAG?**** > > ** ** > > Pascal**** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 16:57 > *To:* Xavier Vilajosana Guillen > *Cc:* Pascal Thubert (pthubert); Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > ** ** > > Hi All,**** > > ** ** > > I think we likely mix the concepts in the two layers, i.e. 15.4e TSCH and > RPL. The Join Priority is existing in a TSCH network and maintained by > TSCH, no matter RPL is used as upper layer or not. Thus, IMHO, 6top and > upper layer can use the Join Priority, but cannot modify it. **** > > ** ** > > In addition, selecting time source parent is for synchronizing to existin= g > network and communicating with neighbors in correct time template, which > should happen before a DODAG is established. Thus, I agree with Xavi that > it is necessary to select a time source parent, or called it as temporary > time source parent, before a DODAG is established.**** > > ** ** > > What do you think?**** > > ** ** > > Qin**** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > On Thu, Aug 22, 2013 at 9:33 PM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > Hi Pascal,**** > > ** ** > > my comment inline:**** > > ** ** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0.**** > > Q: Do we really need to build the time sync tree faster than the RPL grap= h? > **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > yes that would work but we are doing the same as the IEEE802-15.4e Join > priority field is for. The 15.4e defines this mechanism and it is inheren= t > to the networks we address so using it is straightforward. Then as > described by Thomas, we only need to use RPL best parent as soon as we ha= ve > one instead of the lowest prio neighbor. **** > > Another question with time sources is the selection of a time source > parent in the case that a node belongs to more than one DODAG. Which pare= nt > is selected then? An more importantly, do the basic draft considers havin= g > more than one DODAG? **** > > thanks! > Xavi**** > > ** ** > > On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Dear all:**** > > **** > > As you know, RPL may entail temporary loops, in particular if > DAGMaxRankIncrease is not configured to 0.**** > > If as we expect we use the RPL preferred parent tree for time sync, this > will lead to time sync loops. **** > > Two questions here:**** > > 1) how bad is the effect of such loop? I expect that the clocks will > derive rapidly, as if from the perspective of a node the crystal was real= , > real bad.**** > > 2) can we detect that effect and use it to detect a loop in the routing?*= * > ** > > **** > > Please see inline:**** > > **** > > sch] time parent selection based on EB priority**** > > **** > > Qin, Xavi,**** > > **** > > Excellent point. I believe that this is exactly what makes this 6TSCH wor= k > so interesting: figuring out how consolidate the views between upper and > lower layers.**** > > **** > > In my mind, the join priority as you describe looks very much like a > DAGrank. I believe there are, however, two potential questions we should > not forget:**** > > - what if the joining mote does no get all of the EBs of its neighbor?***= * > > - what happens when the topology changes and a node moves up or down in > the DODAG?**** > > **** > > I would suggest the following:**** > > - once the node has fully joined, somehow tie the join priority to its RP= L > DAGrank. We might have to play with the metric to make the join priority > look like a hop count, but I believe it is important the announced join > priority changes when the mote moves up/down in the topology.**** > > - maybe consider the time source parent identified during the joining as > temporary until the final time source parent is discovered. How the final > one is discovered can through some command from the ME (see Qin's > attachement), or after receiving many DIOs.**** > > **** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0. **** > > Q: Do we really need to build the time sync tree faster than the RPL > graph? **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > Cheers,**** > > Pascal**** > > **** > > On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang wrote:**= * > * > > Agree!**** > > **** > > Qin**** > > **** > > On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > HI Qin, > > as a basic setting we want the most basic approach. I guess that using (1= ) > first priority and then RSSi will avoid having loops. As you say all this > approaches would work but I bet for (1) to be the simplest. **** > > cheers! > X**** > > **** > > On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote:*= * > ** > > Hi Xavi,**** > > **** > > It is a good idea to use Priority in EB as a factor to choose initial tim= e > parent. But, I think there are several ways to use the Priority, and othe= r > metrics like RSSI. For example,**** > > **** > > (1) As you suggested, use Priority first, and then RSSI**** > > (2) or use RSSI first, and then Priority**** > > (3) or use a function of Priority and RSSI.**** > > **** > > I'm not sure which is better. What do you think?**** > > **** > > Qin**** > > **** > > **** > > On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > Hi all, > > I want to propose to add in the basic TSCH draft the fact that when a nod= e > joins a network, it uses the EB join priority defined in the Slot and Lin= k > IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority = is > 0 for the PAN coordinator of the network. A node listening several EB > selects as a time parent the node with lowest EB Join Priority. In case o= f > receiving multiple EBs with the same Join priority then filters by other > metrics e.g RSSI of the link. (note that until a DIO is received nodes do= n > not know about the gradient).**** > > A node when sends an EB uses the lowest EB Join priority it has heard and > adds 1 to it as its own Join priority. > > > Current draft section states that RSSI or another metric should be used t= o > select the initial time parent, this has the problem that loops cannot be > avoided until the first DIO is received. With the proposed approach the > problem is solved and does not introduce anything new, just used what 15.= 4e > provides to us.**** > > what is your opinion?**** > > thanks! > Xavi**** > > **** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --047d7bdc87beb8d19704e48b2091 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pascal,

    I think that selecting a tem= porary time source parent is for establishing a basic communication channel= , on which DIOs can be received. Thus, a joining node only needs to sync wi= th the nodes already in the DODAG.

    Make sense?

    Qin

    =


    O= n Thu, Aug 22, 2013 at 11:27 PM, Pascal Thubert (pthubert) <pthubert@cisc= o.com> wrote:

    Hello Qin:

    =A0<= /p>

    Do you think you need to = sync the whole network before RPL DIO/parent selection happens or should we= make it so that we sync only with nodes that are already in the DODAG?

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 16:57
    To: Xavier Vilajosana Guillen
    Cc: Pascal Thubert (pthubert); Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi All,

    =A0

    I think we likely mix the concepts in the two layers= , i.e. 15.4e TSCH and RPL. The Join Priority is existing in a TSCH network = and maintained by TSCH, no matter RPL is used as upper layer or not. Thus, = IMHO, 6top and upper layer can use the Join Priority, but cannot modify it.=A0

    =A0

    In addition, selecting time source parent is for syn= chronizing to existing network and communicating with neighbors in correct = time template, which should happen before a DODAG is established. Thus, I a= gree with Xavi that it is necessary to select a time source parent, or called it as temporary time source pare= nt, before a DODAG is established.

    =A0

    What do you think?

    =A0

    Qin

    =A0

    =A0

    =A0

    =A0

    =A0

    On Thu, Aug 22, 2013 at 9:33 PM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    Hi Pascal,

    =A0

    my comment inline:

    =A0

    [Pascal] Yes, I read Xavi=92s proposal as a m= echanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time sync t= ree faster than the RPL graph?

    =A0

    If no, maybe me could use the priority as a b= oolean to mean that the node is already part of the RPL DAG and may be used= as time source.

    Initially only the root would be priority 0. = All the others would be default 1.

    From there, all nodes that are one hop away f= rom root with good RSSI can sync with the root, and listen to DIOs, and emi= t their own, and set their own priority to zero.

    Children sync to whichever prio 0 neighbor as= time source, listen to DIOs, select a parent, migrate to that parent as ti= me source, and then can set their own priority to zero and send DIOs.

    Would that fly= ?

    yes that would work but we are doing the same= as the IEEE802-15.4e Join priority field is for. The 15.4e defines this me= chanism and it is inherent to the networks we address so using it is straightforward. Then as described by Thomas, we on= ly need to use RPL best parent as soon as we have one instead of the lowest= prio neighbor.=A0

    Another question with time sources is the sel= ection of a time source parent in the case that a node belongs to more than= one DODAG. Which parent is selected then? An more importantly, do the basic draft considers having more than one DODAG?= =A0

    thanks!
    Xavi

    =A0

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pth= ubert) <pthubert= @cisco.com> wrote:

    Dear all:=

    =A0<= /p>

    As you know, RPL may enta= il temporary loops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use th= e RPL preferred parent tree for time sync, this will lead to time sync loop= s.

    Two questions here:

    1) how bad is the effect = of such loop? I expect that the clocks=A0 will derive rapidly, as if from the perspective of a node the crystal was real, real bad.=

    2) can we detect that eff= ect and use it to detect a loop in the routing?

    =A0<= /p>

    Please see inline:=

    =A0<= /p>

    sch] time parent selection based on EB p= riority

    =A0

    Qin, Xavi,

    =A0

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

    =A0

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

    =A0

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME (see Qin's attachement), or after receiving m= any DIOs.

    =A0<= /p>

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

    =A0

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

    =A0

    Qin

    =A0

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

    =A0

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

    =A0

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

    =A0

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

    =A0

    I'm not sure which is better. What do you think?=

    =A0

    Qin

    =A0

    =A0

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

    =A0

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    --047d7bdc87beb8d19704e48b2091-- From qinwang@berkeley.edu Thu Aug 22 08:53:45 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 80F3B21F99A1 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:53:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.96 X-Spam-Level: X-Spam-Status: No, score=-2.96 tagged_above=-999 required=5 tests=[AWL=0.016, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AG2m+TR6mMUA for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 08:53:39 -0700 (PDT) Received: from mail-ve0-f179.google.com (mail-ve0-f179.google.com [209.85.128.179]) by ietfa.amsl.com (Postfix) with ESMTP id 34BA011E81F5 for <6tsch@ietf.org>; Thu, 22 Aug 2013 08:53:38 -0700 (PDT) Received: by mail-ve0-f179.google.com with SMTP id c13so1652997vea.24 for <6tsch@ietf.org>; Thu, 22 Aug 2013 08:53:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=I5wvbIWAGlvVU/8LUFSi+WFSVVfD8JmixkgCyNNI2uE=; b=DeNx1RjG/mor7Ppms2TX0nazfE9VY/hInghZvcc7TFetWjTCqzv19aTHbPkzlCNOQj D6w073QdbZmbOrayuouNYfJMApKa/reLYqO8NfSMb1Ogygi/Gpz90THt0vGI9ltrvSq/ osaqfE2RFzTNwyX37Iid3RyJc98shlNKyD0n4zjBvL9AIOI3YI1tuN17oNWtbryQwUeV 8P9xTfglTbd9ExFycLe9qCFnQaeGxsSopT05LDeXxvvWzZZ5frX76q5+YHL+YzdRDRLD gYddPZ4qbOApRNpHQHSP20Wh8JGovIjkhNhZwxQ3HWSk7pUZVmH71fGW6xl/2HjQi7mx YxXQ== X-Gm-Message-State: ALoCoQm0Yzmbgqb7zQYTo2iIFWSNzzNfqgRHdn8Lya+zKHLP9OxeB7DZBqd2OAd4ok7jiogKx0mL MIME-Version: 1.0 X-Received: by 10.52.103.73 with SMTP id fu9mr1930262vdb.29.1377186817554; Thu, 22 Aug 2013 08:53:37 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 22 Aug 2013 08:53:37 -0700 (PDT) In-Reply-To: References: Date: Thu, 22 Aug 2013 23:53:37 +0800 Message-ID: From: Qin Wang To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=047d7ba9755c0cd6ff04e48b4bb1 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 15:53:45 -0000 --047d7ba9755c0cd6ff04e48b4bb1 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pascal, Is it assumed that 2 DODAG in a same instance must have at least one shared node? Thanks Qin On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Hello Xavi:**** > > ** ** > > The problem is that we have 2 mechanisms that establish a distance to the > root in order to avoid loops, RPL Rank and 4e priority.**** > > Fact is, RPL is probably more elaborate for loop detection and loop > avoidance. I suspect that the priority can easily count to infinity.**** > > So I=92d trust RPL Rank rather than priority, and we seem to agree that w= e > want to time sync with RPL parents.**** > > ** ** > > a) My question is whether it makes sense and value to have a transition > between a time source based on best (hop count) priority and to one based > on best RPL Rank, or if we could use the rank right away. Seems to me tha= t > life would be easier if we use the Rank right away, though it may make th= e > network a bit slower to come up. Passing from one mode to the other will > demand some specifications, what if one node reboots and goes from one mo= de > to the other, etc=85**** > > ** ** > > Now if the question is to reuse the priority field, then we can do > actually change the logic to accommodate priority =3D DAGRank(Rank) for > nodes that are not root, still ensuring that only a node that is already > part of a RPL DAG may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease o= f > 255)**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to DAGRank(Rank) that is < 255.**** > > Children sync to whichever prio < 255 neighbor as time source, listen to > DIOs, select a parent, migrate to that parent as time source, and then ca= n > set their own priority to zero and send DIOs. If later they select a bett= er > parent the priority will get lower so that=92s till OK.**** > > Would that fly?**** > > b) about multiple DAGs, there are 2 cases:**** > > - 2 DODAGs in a same instance. We said we want to support that, and that > implies that the various DODAGs are closely time sync=92d.**** > > - 2 DODAGs in 2 different instances. To be discussed. We have use cases > where that could be useful, one instance playing basic slotted aloha and > the other doing more critical jobs. **** > > ** ** > > We have not agreed on the latter but with a single radio, it seems > problematic if the 2 instances do not share a same sense of time. We=92d = end > up with slot frames that may drift from one another, sometimes overlappin= g=85 > I suspect that we=92d partition time inside a slot frame or using multipl= e > slot frames, but we=92d keep them in sync. Probably there is a need for a > spanning instance (0) for (autonomic) management etc=85 that uses somethi= ng > very simple, always on, very much like your basic draft. If there is such= a > spanning instance, then it can be used to sync everyone, in which casethe > Rank from the dependent instances is not used for time sync.**** > > **** > > What do others think?**** > > ** ** > > Pascal**** > > ** ** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 15:34 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > ** ** > > Hi Pascal,**** > > ** ** > > my comment inline:**** > > ** ** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0.**** > > Q: Do we really need to build the time sync tree faster than the RPL grap= h? > **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > yes that would work but we are doing the same as the IEEE802-15.4e Join > priority field is for. The 15.4e defines this mechanism and it is inheren= t > to the networks we address so using it is straightforward. Then as > described by Thomas, we only need to use RPL best parent as soon as we ha= ve > one instead of the lowest prio neighbor. **** > > Another question with time sources is the selection of a time source > parent in the case that a node belongs to more than one DODAG. Which pare= nt > is selected then? An more importantly, do the basic draft considers havin= g > more than one DODAG? **** > > thanks! > Xavi**** > > ** ** > > On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Dear all:**** > > **** > > As you know, RPL may entail temporary loops, in particular if > DAGMaxRankIncrease is not configured to 0.**** > > If as we expect we use the RPL preferred parent tree for time sync, this > will lead to time sync loops. **** > > Two questions here:**** > > 1) how bad is the effect of such loop? I expect that the clocks will > derive rapidly, as if from the perspective of a node the crystal was real= , > real bad.**** > > 2) can we detect that effect and use it to detect a loop in the routing?*= * > ** > > **** > > Please see inline:**** > > **** > > sch] time parent selection based on EB priority**** > > **** > > Qin, Xavi,**** > > **** > > Excellent point. I believe that this is exactly what makes this 6TSCH wor= k > so interesting: figuring out how consolidate the views between upper and > lower layers.**** > > **** > > In my mind, the join priority as you describe looks very much like a > DAGrank. I believe there are, however, two potential questions we should > not forget:**** > > - what if the joining mote does no get all of the EBs of its neighbor?***= * > > - what happens when the topology changes and a node moves up or down in > the DODAG?**** > > **** > > I would suggest the following:**** > > - once the node has fully joined, somehow tie the join priority to its RP= L > DAGrank. We might have to play with the metric to make the join priority > look like a hop count, but I believe it is important the announced join > priority changes when the mote moves up/down in the topology.**** > > - maybe consider the time source parent identified during the joining as > temporary until the final time source parent is discovered. How the final > one is discovered can through some command from the ME (see Qin's > attachement), or after receiving many DIOs.**** > > **** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0. **** > > Q: Do we really need to build the time sync tree faster than the RPL > graph? **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > Cheers,**** > > Pascal**** > > **** > > On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang wrote:**= * > * > > Agree!**** > > **** > > Qin**** > > **** > > On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > HI Qin, > > as a basic setting we want the most basic approach. I guess that using (1= ) > first priority and then RSSi will avoid having loops. As you say all this > approaches would work but I bet for (1) to be the simplest. **** > > cheers! > X**** > > **** > > On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote:*= * > ** > > Hi Xavi,**** > > **** > > It is a good idea to use Priority in EB as a factor to choose initial tim= e > parent. But, I think there are several ways to use the Priority, and othe= r > metrics like RSSI. For example,**** > > **** > > (1) As you suggested, use Priority first, and then RSSI**** > > (2) or use RSSI first, and then Priority**** > > (3) or use a function of Priority and RSSI.**** > > **** > > I'm not sure which is better. What do you think?**** > > **** > > Qin**** > > **** > > **** > > On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > Hi all, > > I want to propose to add in the basic TSCH draft the fact that when a nod= e > joins a network, it uses the EB join priority defined in the Slot and Lin= k > IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority = is > 0 for the PAN coordinator of the network. A node listening several EB > selects as a time parent the node with lowest EB Join Priority. In case o= f > receiving multiple EBs with the same Join priority then filters by other > metrics e.g RSSI of the link. (note that until a DIO is received nodes do= n > not know about the gradient).**** > > A node when sends an EB uses the lowest EB Join priority it has heard and > adds 1 to it as its own Join priority. > > > Current draft section states that RSSI or another metric should be used t= o > select the initial time parent, this has the problem that loops cannot be > avoided until the first DIO is received. With the proposed approach the > problem is solved and does not introduce anything new, just used what 15.= 4e > provides to us.**** > > what is your opinion?**** > > thanks! > Xavi**** > > **** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7ba9755c0cd6ff04e48b4bb1 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pascal,

    Is it assumed that 2 DODAG i= n a same instance must have at least one shared node?

    <= div>Thanks
    Qin


    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) <pthubert@cis= co.com> wrote:

    Hello Xavi:

    =A0<= /p>

    The problem is that we ha= ve 2 mechanisms that establish a distance to the root in order to avoid loo= ps, RPL Rank and 4e priority.

    Fact is, RPL is probably = more elaborate for loop detection and loop avoidance. I suspect that the pr= iority can easily count to infinity.

    So I=92d trust RPL Rank r= ather than priority, and we seem to agree that we want to time sync with RP= L parents.

    =A0<= /p>

    a) My question is whether= it makes sense and value to have a transition between a time source based = on best (hop count) priority and to one based on best RPL Rank, or if we could use the rank right away. Seems to me that life would = be easier if we use the Rank right away, though it may make the network a b= it slower to come up. Passing from one mode to the other will demand some s= pecifications, what if one node reboots and goes from one mode to the other, etc=85

    =A0<= /p>

    Now if the question is to= reuse the priority field, then we can do actually change the logic to acco= mmodate priority =3D DAGRank(Rank) for nodes that are not root= , still ensuring that only a node that is already part of a RPL DAG may be = used as time source.=

    Initially only the root w= ould be priority 0. All the others would be default 255 (that is DAGRank(IN= FINITE_RANK) assuming MinHopRankIncrease of 255)=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to DAGRank(= Rank) that is < 255.

    Children sync to whicheve= r prio < 255 neighbor as time source, listen to DIOs, select a parent, m= igrate to that parent as time source, and then can set their own priority to zero= and send DIOs. If later they select a better parent the priority will get = lower so that=92s till OK.

    Would that fly?

    b) about multiple DAGs, t= here are 2 cases:

    - 2 DODAGs in a same inst= ance. We said we want to support that, and that implies that the various DO= DAGs are closely time sync=92d.

    - 2 DODAGs in 2 different= instances. To be discussed. We have use cases where that could be useful, = one instance playing basic slotted aloha and the other doing more critical jobs.

    =A0<= /p>

    We have not agreed on the= latter but with a single radio, it seems problematic if the 2 instances do= not share a same sense of time. We=92d end up with slot frames that may drift from one another, sometimes overlapping=85 I suspect that w= e=92d partition time inside a slot frame or using multiple slot frames, but= we=92d keep them in sync. Probably there is a need for a spanning instance= (0) for (autonomic) management etc=85 that uses something very simple, always on, very much like your basic draft. If= there is such a spanning instance, then it can be used to sync everyone, i= n which casethe Rank from the dependent instances is not used for time sync= .

    What do others think?<= /u>

    =A0<= /p>

    Pascal

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi Pascal,

    =A0

    my comment inline:

    =A0

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?=

    =A0<= /u>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    yes that would work but w= e are doing the same as the IEEE802-15.4e Join priority field is for. The 1= 5.4e defines this mechanism and it is inherent to the networks we address so using it is straightforwa= rd. Then as described by Thomas, we only need to use RPL best parent as soo= n as we have one instead of the lowest prio neighbor.=A0

    Another question with tim= e sources is the selection of a time source parent in the case that a node = belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic dr= aft considers having more than one DODAG?=A0

    thanks!
    Xavi

    =A0

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pth= ubert) <pthubert= @cisco.com> wrote:

    Dear all:

    =A0<= /p>

    As you know, RPL may enta= il temporary loops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use th= e RPL preferred parent tree for time sync, this will lead to time sync loop= s.

    Two questions here:

    1) how bad is the effect = of such loop? I expect that the clocks=A0 will derive rapidly, as if from the perspective of a node the crystal was real, real bad.=

    2) can we detect that eff= ect and use it to detect a loop in the routing?

    =A0<= /p>

    Please see inline:=

    =A0<= /p>

    sch] time parent selection based on EB p= riority

    =A0

    Qin, Xavi,

    =A0

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

    =A0

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

    =A0

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME (see Qin's attachement), or after receiving m= any DIOs.

    =A0<= /p>

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

    =A0

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

    =A0

    Qin

    =A0

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

    =A0

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

    =A0

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

    =A0

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

    =A0

    I'm not sure which is better. What do you think?=

    =A0

    Qin

    =A0

    =A0

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

    =A0

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7ba9755c0cd6ff04e48b4bb1-- From pthubert@cisco.com Thu Aug 22 09:16:06 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 940FA11E81AA for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 09:16:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.523 X-Spam-Level: X-Spam-Status: No, score=-10.523 tagged_above=-999 required=5 tests=[AWL=0.075, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zcd81hmkGqYn for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 09:16:00 -0700 (PDT) Received: from rcdn-iport-4.cisco.com (rcdn-iport-4.cisco.com [173.37.86.75]) by ietfa.amsl.com (Postfix) with ESMTP id 47AC411E81DA for <6tsch@ietf.org>; Thu, 22 Aug 2013 09:15:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=47004; q=dns/txt; s=iport; t=1377188156; x=1378397756; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=GxxkACcW6OI5POU49MZL0tUqbYN1hw1nD1Sam1n5rmU=; b=gElvF3yINFqnsasFyiA3oxaAd2PjX6/Gthbs9ZrBrmVXMhk3ORcuLgXx k3o3lHIce7lTWoCs5pUaWQ+kAWMw4dJC2UFgV93ng9+u1TY89cS5J5mpv N6j//CGVd5l6onLPLaEYis6UUaGoqH7HJ1NMNe/+1xy01mWbwkRAR6IHq Y=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqIFAC04FlKtJV2a/2dsb2JhbABaDoI1RDVRwAiBHRZ0giQBAQEEAQEBKkELEAIBCBEEAQELFgEGBycLFAkIAgQOBQgRh3cMtxgEkDUtBAYBgxt7A4VIgy6KVkGVM4JgP4FpJB4 X-IronPort-AV: E=Sophos;i="4.89,934,1367971200"; d="scan'208,217";a="250609693" Received: from rcdn-core-3.cisco.com ([173.37.93.154]) by rcdn-iport-4.cisco.com with ESMTP; 22 Aug 2013 16:15:54 +0000 Received: from xhc-aln-x14.cisco.com (xhc-aln-x14.cisco.com [173.36.12.88]) by rcdn-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id r7MGFsRW008630 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 22 Aug 2013 16:15:54 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-aln-x14.cisco.com ([173.36.12.88]) with mapi id 14.02.0318.004; Thu, 22 Aug 2013 11:15:54 -0500 From: "Pascal Thubert (pthubert)" To: Qin Wang Thread-Topic: [6tsch] time parent selection based on EB priority Thread-Index: AQHOn0/DVeOseQSyNkOUAo0xL8C2jpmhZjgg Date: Thu, 22 Aug 2013 16:15:53 +0000 Deferred-Delivery: Thu, 22 Aug 2013 16:15:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.199.2] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD8414278D5xmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 16:16:06 -0000 --_000_E045AECD98228444A58C61C200AE1BD8414278D5xmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I do not think so, Qin; but it is required that a node on one DODAG may jump onto the other, and to= do that, it is useful to monitoring candidates from both dodags. Note that DODAGs partition the network, and all the parents must be in one = of them. Cheers; Pascal From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: jeudi 22 ao=FBt 2013 17:54 To: Pascal Thubert (pthubert) Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi Pascal, Is it assumed that 2 DODAG in a same instance must have at least one shared= node? Thanks Qin On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) > wrote: Hello Xavi: The problem is that we have 2 mechanisms that establish a distance to the r= oot in order to avoid loops, RPL Rank and 4e priority. Fact is, RPL is probably more elaborate for loop detection and loop avoidan= ce. I suspect that the priority can easily count to infinity. So I'd trust RPL Rank rather than priority, and we seem to agree that we wa= nt to time sync with RPL parents. a) My question is whether it makes sense and value to have a transition bet= ween a time source based on best (hop count) priority and to one based on b= est RPL Rank, or if we could use the rank right away. Seems to me that life= would be easier if we use the Rank right away, though it may make the netw= ork a bit slower to come up. Passing from one mode to the other will demand= some specifications, what if one node reboots and goes from one mode to th= e other, etc... Now if the question is to reuse the priority field, then we can do actually= change the logic to accommodate priority =3D DAGRank(Rank) for nodes that = are not root, still ensuring that only a node that is already part of a RPL= DAG may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255) >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to DAGRank(Rank) that is < 255. Children sync to whichever prio < 255 neighbor as time source, listen to DI= Os, select a parent, migrate to that parent as time source, and then can se= t their own priority to zero and send DIOs. If later they select a better p= arent the priority will get lower so that's till OK. Would that fly? b) about multiple DAGs, there are 2 cases: - 2 DODAGs in a same instance. We said we want to support that, and that im= plies that the various DODAGs are closely time sync'd. - 2 DODAGs in 2 different instances. To be discussed. We have use cases whe= re that could be useful, one instance playing basic slotted aloha and the o= ther doing more critical jobs. We have not agreed on the latter but with a single radio, it seems problema= tic if the 2 instances do not share a same sense of time. We'd end up with = slot frames that may drift from one another, sometimes overlapping... I sus= pect that we'd partition time inside a slot frame or using multiple slot fr= ames, but we'd keep them in sync. Probably there is a need for a spanning i= nstance (0) for (autonomic) management etc... that uses something very simp= le, always on, very much like your basic draft. If there is such a spanning= instance, then it can be used to sync everyone, in which casethe Rank from= the dependent instances is not used for time sync. What do others think? Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: jeudi 22 ao=FBt 2013 15:34 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi Pascal, my comment inline: [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? yes that would work but we are doing the same as the IEEE802-15.4e Join pri= ority field is for. The 15.4e defines this mechanism and it is inherent to = the networks we address so using it is straightforward. Then as described b= y Thomas, we only need to use RPL best parent as soon as we have one instea= d of the lowest prio neighbor. Another question with time sources is the selection of a time source parent= in the case that a node belongs to more than one DODAG. Which parent is se= lected then? An more importantly, do the basic draft considers having more = than one DODAG? thanks! Xavi On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) > wrote: Dear all: As you know, RPL may entail temporary loops, in particular if DAGMaxRankInc= rease is not configured to 0. If as we expect we use the RPL preferred parent tree for time sync, this wi= ll lead to time sync loops. Two questions here: 1) how bad is the effect of such loop? I expect that the clocks will deriv= e rapidly, as if from the perspective of a node the crystal was real, real = bad. 2) can we detect that effect and use it to detect a loop in the routing? Please see inline: sch] time parent selection based on EB priority Qin, Xavi, Excellent point. I believe that this is exactly what makes this 6TSCH work = so interesting: figuring out how consolidate the views between upper and lo= wer layers. In my mind, the join priority as you describe looks very much like a DAGran= k. I believe there are, however, two potential questions we should not forg= et: - what if the joining mote does no get all of the EBs of its neighbor? - what happens when the topology changes and a node moves up or down in the= DODAG? I would suggest the following: - once the node has fully joined, somehow tie the join priority to its RPL = DAGrank. We might have to play with the metric to make the join priority lo= ok like a hop count, but I believe it is important the announced join prior= ity changes when the mote moves up/down in the topology. - maybe consider the time source parent identified during the joining as te= mporary until the final time source parent is discovered. How the final one= is discovered can through some command from the ME (see Qin's attachement)= , or after receiving many DIOs. [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? Cheers, Pascal On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang > wrote: Agree! Qin On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen > wrote: HI Qin, as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest. cheers! X On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang > wrote: Hi Xavi, It is a good idea to use Priority in EB as a factor to choose initial time = parent. But, I think there are several ways to use the Priority, and other = metrics like RSSI. For example, (1) As you suggested, use Priority first, and then RSSI (2) or use RSSI first, and then Priority (3) or use a function of Priority and RSSI. I'm not sure which is better. What do you think? Qin On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen > wrote: Hi all, I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB sele= cts as a time parent the node with lowest EB Join Priority. In case of rece= iving multiple EBs with the same Join priority then filters by other metric= s e.g RSSI of the link. (note that until a DIO is received nodes don not kn= ow about the gradient). A node when sends an EB uses the lowest EB Join priority it has heard and a= dds 1 to it as its own Join priority. Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e pro= vides to us. what is your opinion? thanks! Xavi _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD8414278D5xmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    I do not think so, Qin;

     <= /p>

    but it is required that a= node on one DODAG may jump onto the other, and to do that, it is useful to= monitoring candidates from both dodags.

    Note that DODAGs partitio= n the network, and all the parents must be in one of them.

     <= /p>

    Cheers;=

     <= /p>

    Pascal

     <= /p>

    From: Qin Wang= [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 17:54
    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority=

     

    Hi Pascal,

     

    Is it assumed that 2 DODAG in a same instance must h= ave at least one shared node?

     

    Thanks

    Qin

     

    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

     

    The problem is that we have 2 mechanism= s that establish a distance to the root in order to avoid loops, RPL Rank and 4e priority.

    Fact is, RPL is probably more elaborate= for loop detection and loop avoidance. I suspect that the priority can easily count to infinity.

    So I’d trust RPL Rank rather than= priority, and we seem to agree that we want to time sync with RPL parents.

     

    a) My question is whether it makes sens= e and value to have a transition between a time source based on best (hop count) priority and to one based on best RPL Rank, or if we c= ould use the rank right away. Seems to me that life would be easier if we u= se the Rank right away, though it may make the network a bit slower to come= up. Passing from one mode to the other will demand some specifications, what if one node reboots and goes f= rom one mode to the other, etc…

     

    Now if the question is to reuse the pri= ority field, then we can do actually change the logic to accommodate priority =3D DAGRank(Rank) for nodes that are not root, still ensuring tha= t only a node that is already part of a RPL DAG may be used as time source.=

    Initially only the root would be priori= ty 0. All the others would be default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255)

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to DAGRank(= Rank) that is < 255.

    Children sync to whichever prio < 25= 5 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs. If later they select a better parent the priority will get = lower so that’s till OK.

    Would that fly?

    b) about multiple DAGs, there are 2 cas= es:

    - 2 DODAGs in a same instance. We said = we want to support that, and that implies that the various DODAGs are closely time sync’d.

    - 2 DODAGs in 2 different instances. To= be discussed. We have use cases where that could be useful, one instance playing basic slotted aloha and the other doing more critical= jobs.

     

    We have not agreed on the latter but wi= th a single radio, it seems problematic if the 2 instances do not share a same sense of time. We’d end up with slot frames that= may drift from one another, sometimes overlapping… I suspect that we= ’d partition time inside a slot frame or using multiple slot frames, = but we’d keep them in sync. Probably there is a need for a spanning instance (0) for (autonomic) management etc… that use= s something very simple, always on, very much like your basic draft. If the= re is such a spanning instance, then it can be used to sync everyone, in wh= ich casethe Rank from the dependent instances is not used for time sync.

    What do others think?=

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

     

    Hi Pascal,

     

    my comment inline:

     

    [Pascal] Yes, I read Xavi’s propo= sal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time = sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority = as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 1.

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neigh= bor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    y= es that would work but we are doing the same as the IEEE802-15.4e Join prio= rity field is for. The 15.4e defines this mechanism and it is inherent to the networks we address so using it is straightforward. The= n as described by Thomas, we only need to use RPL best parent as soon as we= have one instead of the lowest prio neighbor. 

    A= nother question with time sources is the selection of a time source parent = in the case that a node belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic draft considers= having more than one DODAG? 

    t= hanks!
    Xavi

     

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) <pthubert@cisco.com= > wrote:

    Dear all:

     

    As you know, RPL may entail temporary l= oops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use the RPL preferre= d parent tree for time sync, this will lead to time sync loops.

    Two questions here:

    1) how bad is the effect of such loop? = I expect that the clocks  will derive rapidly, as if from the perspective of a node the crystal was real, real bad.

    2) can we detect that effect and use it= to detect a loop in the routing?

     

    Please see inline:

     

    sch] time parent selection based on EB priority=

     

    Qin, Xavi,

     

    Excellent point. I believe that this is exactly what makes this 6T= SCH work so interesting: figuring out how consolidate the views between upp= er and lower layers.

     

    In my mind, the join priority as you describe looks very much like= a DAGrank. I believe there are, however, two potential questions we should= not forget:

    - what if the joining mote does no get all of the EBs of its neigh= bor?

    - what happens when the topology changes and a node moves up or do= wn in the DODAG?

     

    I would suggest the following:

    - once the node has fully joined, somehow tie the join priority to= its RPL DAGrank. We might have to play with the metric to make the join pr= iority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified during the join= ing as temporary until the final time source parent is discovered. How the = final one is discovered can through some command from the ME (see Qin's attachement), or after receiving many = DIOs.

     

    [Pascal] Yes, I read Xavi’s propo= sal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time = sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority = as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 1.

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neigh= bor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

     

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

     

    Qin

     

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

     

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:<= o:p>

    Hi Xavi,

     

    It is a good idea to use Priority in EB as a factor to choose init= ial time parent. But, I think there are several ways to use the Priority, a= nd other metrics like RSSI. For example,

     

    (1) As you suggested, use Priority first, and then RSSI=

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

     

    I'm not sure which is better. What do you think?

     

    Qin

     

     

    On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an EB uses the lowest EB Join priority it has heard an= d adds 1 to it as its own Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

     

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_E045AECD98228444A58C61C200AE1BD8414278D5xmbrcdx01ciscoc_-- From qinwang@berkeley.edu Thu Aug 22 10:03:26 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1CA4A21F9CF7 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 10:03:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.961 X-Spam-Level: X-Spam-Status: No, score=-2.961 tagged_above=-999 required=5 tests=[AWL=0.015, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lokX1Gv-RINS for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 10:03:21 -0700 (PDT) Received: from mail-vb0-f51.google.com (mail-vb0-f51.google.com [209.85.212.51]) by ietfa.amsl.com (Postfix) with ESMTP id 8355B21F99CD for <6tsch@ietf.org>; Thu, 22 Aug 2013 10:03:21 -0700 (PDT) Received: by mail-vb0-f51.google.com with SMTP id x16so1502790vbf.10 for <6tsch@ietf.org>; Thu, 22 Aug 2013 10:03:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=KR9fkybjvuRBaYXVC+FJK1cpNbKGox3rNzbge6TrXQw=; b=gt9CAbgEPYS8FU+mCd+5Oja4t9HbbAZJhgumWHoiMp37RcwjY3j637MACEfJRfXwCo jX8eCLPaMj9IFgqw8/ylPUNYdoORGu+oUuZ2UcMOw9kU5XKZ3w2yqlTLoIBDbhu5lIgV Eq/iIcKKU3zpOFnT7iWWj4MLBAmS1m3mTJR5bO5+/Pe2g2vLSUGcAvao1jiVPXiOtUWH LHXnKoKSMyHDbj0z1SJ/kf/Idj3XI9AADST83a3OnTp8ZRSgsMF4DT8HFJls2xe12Mci k93KV59pGCbQhsYegiwrBL/BPHYEtTdiHhYm3XiTCqVkMXV4tHbjb5x8OAD5qbbQLsD+ Ja4Q== X-Gm-Message-State: ALoCoQk9pxqmp47Kl8qv0WEWTCTD8Ou/bbsBxZqbiD7Ey1mAH/jKMq7zINIRpvSOVMcCaLoRP3Z9 MIME-Version: 1.0 X-Received: by 10.52.119.139 with SMTP id ku11mr704976vdb.42.1377191000859; Thu, 22 Aug 2013 10:03:20 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 22 Aug 2013 10:03:20 -0700 (PDT) In-Reply-To: References: Date: Fri, 23 Aug 2013 01:03:20 +0800 Message-ID: From: Qin Wang To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=047d7bf0d3ec64fc1804e48c4467 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 17:03:26 -0000 --047d7bf0d3ec64fc1804e48c4467 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Pascal, It may bring in some complexity. Think about the case. DODAG1 and DODAG2 are in a same instance, but have no shared nodes, thus may not be able sync with each other. A new node (node-A) comes in, wants to join into the two DODAGs, in another word, want to jump between the two DODAGs. I believe node-A has to change its time source parent and re-sync when it jump from one DODAG to another. Right? Thank Qin On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > I do not think so, Qin; **** > > ** ** > > but it is required that a node on one DODAG may jump onto the other, and > to do that, it is useful to monitoring candidates from both dodags.**** > > Note that DODAGs partition the network, and all the parents must be in on= e > of them.**** > > ** ** > > Cheers;**** > > ** ** > > Pascal**** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 17:54 > *To:* Pascal Thubert (pthubert) > *Cc:* xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org > > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > ** ** > > Hi Pascal,**** > > ** ** > > Is it assumed that 2 DODAG in a same instance must have at least one > shared node?**** > > ** ** > > Thanks**** > > Qin**** > > ** ** > > On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > The problem is that we have 2 mechanisms that establish a distance to the > root in order to avoid loops, RPL Rank and 4e priority.**** > > Fact is, RPL is probably more elaborate for loop detection and loop > avoidance. I suspect that the priority can easily count to infinity.**** > > So I=92d trust RPL Rank rather than priority, and we seem to agree that w= e > want to time sync with RPL parents.**** > > **** > > a) My question is whether it makes sense and value to have a transition > between a time source based on best (hop count) priority and to one based > on best RPL Rank, or if we could use the rank right away. Seems to me tha= t > life would be easier if we use the Rank right away, though it may make th= e > network a bit slower to come up. Passing from one mode to the other will > demand some specifications, what if one node reboots and goes from one mo= de > to the other, etc=85**** > > **** > > Now if the question is to reuse the priority field, then we can do > actually change the logic to accommodate priority =3D DAGRank(Rank) for n= odes > that are not root, still ensuring that only a node that is already part o= f > a RPL DAG may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease o= f > 255)**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to DAGRank(Rank) that is < 255.**** > > Children sync to whichever prio < 255 neighbor as time source, listen to > DIOs, select a parent, migrate to that parent as time source, and then ca= n > set their own priority to zero and send DIOs. If later they select a bett= er > parent the priority will get lower so that=92s till OK.**** > > Would that fly?**** > > b) about multiple DAGs, there are 2 cases:**** > > - 2 DODAGs in a same instance. We said we want to support that, and that > implies that the various DODAGs are closely time sync=92d.**** > > - 2 DODAGs in 2 different instances. To be discussed. We have use cases > where that could be useful, one instance playing basic slotted aloha and > the other doing more critical jobs. **** > > **** > > We have not agreed on the latter but with a single radio, it seems > problematic if the 2 instances do not share a same sense of time. We=92d = end > up with slot frames that may drift from one another, sometimes overlappin= g=85 > I suspect that we=92d partition time inside a slot frame or using multipl= e > slot frames, but we=92d keep them in sync. Probably there is a need for a > spanning instance (0) for (autonomic) management etc=85 that uses somethi= ng > very simple, always on, very much like your basic draft. If there is such= a > spanning instance, then it can be used to sync everyone, in which casethe > Rank from the dependent instances is not used for time sync.**** > > What do others think?**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 15:34 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > **** > > Hi Pascal,**** > > **** > > my comment inline:**** > > **** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0.**** > > Q: Do we really need to build the time sync tree faster than the RPL grap= h? > **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > yes that would work but we are doing the same as the IEEE802-15.4e Join > priority field is for. The 15.4e defines this mechanism and it is inheren= t > to the networks we address so using it is straightforward. Then as > described by Thomas, we only need to use RPL best parent as soon as we ha= ve > one instead of the lowest prio neighbor. **** > > Another question with time sources is the selection of a time source > parent in the case that a node belongs to more than one DODAG. Which pare= nt > is selected then? An more importantly, do the basic draft considers havin= g > more than one DODAG? **** > > thanks! > Xavi**** > > **** > > On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Dear all:**** > > **** > > As you know, RPL may entail temporary loops, in particular if > DAGMaxRankIncrease is not configured to 0.**** > > If as we expect we use the RPL preferred parent tree for time sync, this > will lead to time sync loops. **** > > Two questions here:**** > > 1) how bad is the effect of such loop? I expect that the clocks will > derive rapidly, as if from the perspective of a node the crystal was real= , > real bad.**** > > 2) can we detect that effect and use it to detect a loop in the routing?*= * > ** > > **** > > Please see inline:**** > > **** > > sch] time parent selection based on EB priority**** > > **** > > Qin, Xavi,**** > > **** > > Excellent point. I believe that this is exactly what makes this 6TSCH wor= k > so interesting: figuring out how consolidate the views between upper and > lower layers.**** > > **** > > In my mind, the join priority as you describe looks very much like a > DAGrank. I believe there are, however, two potential questions we should > not forget:**** > > - what if the joining mote does no get all of the EBs of its neighbor?***= * > > - what happens when the topology changes and a node moves up or down in > the DODAG?**** > > **** > > I would suggest the following:**** > > - once the node has fully joined, somehow tie the join priority to its RP= L > DAGrank. We might have to play with the metric to make the join priority > look like a hop count, but I believe it is important the announced join > priority changes when the mote moves up/down in the topology.**** > > - maybe consider the time source parent identified during the joining as > temporary until the final time source parent is discovered. How the final > one is discovered can through some command from the ME (see Qin's > attachement), or after receiving many DIOs.**** > > **** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0. **** > > Q: Do we really need to build the time sync tree faster than the RPL > graph? **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > Cheers,**** > > Pascal**** > > **** > > On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang wrote:**= * > * > > Agree!**** > > **** > > Qin**** > > **** > > On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > HI Qin, > > as a basic setting we want the most basic approach. I guess that using (1= ) > first priority and then RSSi will avoid having loops. As you say all this > approaches would work but I bet for (1) to be the simplest. **** > > cheers! > X**** > > **** > > On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote:*= * > ** > > Hi Xavi,**** > > **** > > It is a good idea to use Priority in EB as a factor to choose initial tim= e > parent. But, I think there are several ways to use the Priority, and othe= r > metrics like RSSI. For example,**** > > **** > > (1) As you suggested, use Priority first, and then RSSI**** > > (2) or use RSSI first, and then Priority**** > > (3) or use a function of Priority and RSSI.**** > > **** > > I'm not sure which is better. What do you think?**** > > **** > > Qin**** > > **** > > **** > > On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > Hi all, > > I want to propose to add in the basic TSCH draft the fact that when a nod= e > joins a network, it uses the EB join priority defined in the Slot and Lin= k > IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority = is > 0 for the PAN coordinator of the network. A node listening several EB > selects as a time parent the node with lowest EB Join Priority. In case o= f > receiving multiple EBs with the same Join priority then filters by other > metrics e.g RSSI of the link. (note that until a DIO is received nodes do= n > not know about the gradient).**** > > A node when sends an EB uses the lowest EB Join priority it has heard and > adds 1 to it as its own Join priority. > > > Current draft section states that RSSI or another metric should be used t= o > select the initial time parent, this has the problem that loops cannot be > avoided until the first DIO is received. With the proposed approach the > problem is solved and does not introduce anything new, just used what 15.= 4e > provides to us.**** > > what is your opinion?**** > > thanks! > Xavi**** > > **** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --047d7bf0d3ec64fc1804e48c4467 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Pascal,

    It may bring in some complexity= . Think about the case. DODAG1 and DODAG2 are in a same instance, but have = no shared nodes, thus may not be able sync with each other. =A0A new node (= node-A) comes in, wants to join into the two DODAGs, in another word, want = to jump between the two DODAGs. =A0I believe node-A has to change its time = source parent and re-sync when it jump from one DODAG to another. Right?

    Thank
    Qin


    =



    On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) <pthu= bert@cisco.com> wrote:

    I do not think so, Qin;

    =A0<= /p>

    but it is required that a= node on one DODAG may jump onto the other, and to do that, it is useful to= monitoring candidates from both dodags.

    Note that DODAGs partitio= n the network, and all the parents must be in one of them.

    =A0<= /p>

    Cheers;

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 17:54
    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi Pascal,

    =A0

    Is it assumed that 2 DODAG in a same instance must h= ave at least one shared node?

    =A0

    Thanks

    Qin

    =A0

    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

    =A0<= /p>

    The problem is that we ha= ve 2 mechanisms that establish a distance to the root in order to avoid loops, RPL Rank and 4e priority.

    Fact is, RPL is probably = more elaborate for loop detection and loop avoidance. I suspect that the priority can easily count to infinity.

    So I=92d trust RPL Rank r= ather than priority, and we seem to agree that we want to time sync with RP= L parents.

    =A0<= /p>

    a) My question is whether= it makes sense and value to have a transition between a time source based on best (hop count) priority and to one based on best RPL Rank, or if we c= ould use the rank right away. Seems to me that life would be easier if we u= se the Rank right away, though it may make the network a bit slower to come= up. Passing from one mode to the other will demand some specifications, what if one node reboots and goes f= rom one mode to the other, etc=85

    =A0<= /p>

    Now if the question is to= reuse the priority field, then we can do actually change the logic to acco= mmodate priority =3D DAGRank(Rank) for nodes that are not root, still ensuring tha= t only a node that is already part of a RPL DAG may be used as time source.=

    Initially only the root w= ould be priority 0. All the others would be default 255 (that is DAGRank(IN= FINITE_RANK) assuming MinHopRankIncrease of 255)

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to DAGRank(= Rank) that is < 255.

    Children sync to whicheve= r prio < 255 neighbor as time source, listen to DIOs, select a parent, m= igrate to that parent as time source, and then can set their own priority to zero= and send DIOs. If later they select a better parent the priority will get = lower so that=92s till OK.

    Would that fly?

    b) about multiple DAGs, t= here are 2 cases:

    - 2 DODAGs in a same inst= ance. We said we want to support that, and that implies that the various DODAGs are closely time sync=92d.

    - 2 DODAGs in 2 different= instances. To be discussed. We have use cases where that could be useful, one instance playing basic slotted aloha and the other doing more critical= jobs.

    =A0<= /p>

    We have not agreed on the= latter but with a single radio, it seems problematic if the 2 instances do not share a same sense of time. We=92d end up with slot frames that may= drift from one another, sometimes overlapping=85 I suspect that we=92d par= tition time inside a slot frame or using multiple slot frames, but we=92d k= eep them in sync. Probably there is a need for a spanning instance (0) for (autonomic) management etc=85 that uses so= mething very simple, always on, very much like your basic draft. If there i= s such a spanning instance, then it can be used to sync everyone, in which = casethe Rank from the dependent instances is not used for time sync.

    What do others think?

    =A0<= /p>

    Pascal

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi Pascal,

    =A0

    my comment inline:

    =A0

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    yes that would work but w= e are doing the same as the IEEE802-15.4e Join priority field is for. The 1= 5.4e defines this mechanism and it is inherent to the networks we address so using it is straightforward. The= n as described by Thomas, we only need to use RPL best parent as soon as we= have one instead of the lowest prio neighbor.=A0

    Another question with tim= e sources is the selection of a time source parent in the case that a node = belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic draft considers= having more than one DODAG?=A0

    thanks!
    Xavi

    =A0

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pth= ubert) <pthubert= @cisco.com> wrote:

    Dear all:=

    =A0<= /p>

    As you know, RPL may enta= il temporary loops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use th= e RPL preferred parent tree for time sync, this will lead to time sync loop= s.

    Two questions here:

    1) how bad is the effect = of such loop? I expect that the clocks=A0 will derive rapidly, as if from the perspective of a node the crystal was real, real bad.=

    2) can we detect that eff= ect and use it to detect a loop in the routing?

    =A0<= /p>

    Please see inline:=

    =A0<= /p>

    sch] time parent selection based on EB p= riority

    =A0

    Qin, Xavi,

    =A0

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

    =A0

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

    =A0

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME (see Qin's attachement), or after receiving m= any DIOs.

    =A0<= /p>

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

    =A0

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

    =A0

    Qin

    =A0

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

    =A0

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

    =A0

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

    =A0

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

    =A0

    I'm not sure which is better. What do you think?=

    =A0

    Qin

    =A0

    =A0

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

    =A0

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    --047d7bf0d3ec64fc1804e48c4467-- From pthubert@cisco.com Thu Aug 22 12:00:34 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5F07811E8230 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 12:00:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.549 X-Spam-Level: X-Spam-Status: No, score=-10.549 tagged_above=-999 required=5 tests=[AWL=0.051, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SrKTUNLlC8hR for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 12:00:28 -0700 (PDT) Received: from rcdn-iport-6.cisco.com (rcdn-iport-6.cisco.com [173.37.86.77]) by ietfa.amsl.com (Postfix) with ESMTP id 46AC711E8218 for <6tsch@ietf.org>; Thu, 22 Aug 2013 12:00:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2461; q=dns/txt; s=iport; t=1377198028; x=1378407628; h=from:to:subject:date:message-id: content-transfer-encoding:mime-version; bh=ejMk5T5bMWKza/2R06EiVcRD5SA760Z2dT0a58dylC0=; b=HCXYD8jv1m8SXOditOUesX4QITz0DiZkYiqose8eQFZSaLpMkeNduRYG JugYpk6cXUAfUOAvuonvrY94eSPBVyIdlXsp7PKrE14BssznqFRgJL8Qp DggS13wZ/zAQwirwvxGpWq12bH8XmjP6jo9XBr2po8hRUL2aVXQwbXihx g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AiwFAENfFlKtJXG+/2dsb2JhbABAFwODBzVRwAqBHRZ0giYBBDoODRElASoKAQMGBjwkAgEBAwEaiAgMNKgiEY4Ijzh9Mw8HB4MDewOZE5Atgk5RgXI5fQ X-IronPort-AV: E=Sophos;i="4.89,935,1367971200"; d="scan'208";a="250622211" Received: from rcdn-core2-3.cisco.com ([173.37.113.190]) by rcdn-iport-6.cisco.com with ESMTP; 22 Aug 2013 19:00:14 +0000 Received: from xhc-aln-x01.cisco.com (xhc-aln-x01.cisco.com [173.36.12.75]) by rcdn-core2-3.cisco.com (8.14.5/8.14.5) with ESMTP id r7MJ0CYg024850 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 22 Aug 2013 19:00:14 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-aln-x01.cisco.com ([173.36.12.75]) with mapi id 14.02.0318.004; Thu, 22 Aug 2013 14:00:13 -0500 From: "Pascal Thubert (pthubert)" To: "6tsch@ietf.org" <6tsch@ietf.org>, Carsten Bormann Thread-Topic: Agenda for tomorrow Thread-Index: Ac6faXKAPt4EkOYDQxWXY3GRgSkqZA== Date: Thu, 22 Aug 2013 19:00:12 +0000 Deferred-Delivery: Thu, 22 Aug 2013 18:58:00 +0000 Message-ID: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.110.190] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: [6tsch] Agenda for tomorrow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 19:00:34 -0000 Dear all: Please find below the proposed agenda for the 6TSCH call tomorrow: * Approval minutes & agenda bashing _[2min]_=20 * CBOR [Carsten, 10min] * Identifying the flows [Pouria, Qin, 10min]=20 * Update basic draft [Xavi, 10min]=20 * Time parent selection and EB priority [Xavi, Qin, 20min] * renaming 6TSCH [5min] * AOB _[1min]_ As usual, feel free to propose any changes to the agenda, also at the begi= nning of the call. Remember that this call will be recorded. Cheers, Pascal & Thomas ---- Topic: 6TSCH Weekly Time: 8:00 am, Pacific Daylight Time (San Francisco, GMT-07:00)=20 Meeting Number: 206 802 913=20 Meeting Password: sixtus=20 -------------------------------------------------------=20 To start the online meeting=20 -------------------------------------------------------=20 1. Go to https://ciscosales.webex.com/ciscosales/j.php?ED=3D219615007&UID= =3D481905242&PW=3DNZTRkNDAwOTE1&RT=3DMiMyMw%3D%3D 2. Log in to your account.=20 3. Click "Start Now".=20 4. 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Follow the prompts to enter the Meeting Number (listed above) or Access = Code followed by the # sign.=20 San Jose, CA: +1.408.525.6800 RTP: +1.919.392.3330=20 US/Canada: +1.866.432.9903 United Kingdom: +44.20.8824.0117=20 India: +91.80.4350.1111 Germany: +49.619.6773.9002=20 Japan: +81.3.5763.9394 China: +86.10.8515.5666=20 To check whether you have the appropriate players installed for UCF (Univer= sal Communications Format) rich media files, go to https://ciscosales.webex= .com/ciscosales/systemdiagnosis.php=20 http://www.webex.com=20 CCM:+14085256800x206802913 From pthubert@cisco.com Thu Aug 22 12:00:40 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 04AE611E821C for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 12:00:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.561 X-Spam-Level: X-Spam-Status: No, score=-10.561 tagged_above=-999 required=5 tests=[AWL=0.037, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4e0hPBWzbFSn for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 12:00:28 -0700 (PDT) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id 611A211E821E for <6tsch@ietf.org>; Thu, 22 Aug 2013 12:00:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=54687; q=dns/txt; s=iport; t=1377198021; x=1378407621; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=e0wfLa3MOI7SqP0o6yP8WIFMe5Rm9DSkTmbaLD9ZDfA=; b=bwQWYe+HYozEsAFZaBfgp44uJsgTVM9RMUTylydQ24dCohspS89VqZiP H99LKqqojp1KpGqK6EIdEuME/Huckv7YRDztFRs48hA2PsMZ2Z1Z9leUi nu4F07sPZxGL1kQ639LsUln7O2bWMnTuc45eMpzOZPYeymYW6S93EML1E E=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqMFAM9eFlKtJV2d/2dsb2JhbABaDoI1RDVRwAqBHRZ0giQBAQEEAQEBFxNBCxACAQgRBAEBCxYBBgcnCxQJCAIEDgUIEYd3DLZrBJA1LQQGAYMbewOFSIMuilZBlTOCYD+BaSQe X-IronPort-AV: E=Sophos;i="4.89,935,1367971200"; d="scan'208,217";a="250410190" Received: from rcdn-core-6.cisco.com ([173.37.93.157]) by rcdn-iport-1.cisco.com with ESMTP; 22 Aug 2013 19:00:10 +0000 Received: from xhc-aln-x10.cisco.com (xhc-aln-x10.cisco.com [173.36.12.84]) by rcdn-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id r7MJ0AKA016329 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 22 Aug 2013 19:00:10 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-aln-x10.cisco.com ([173.36.12.84]) with mapi id 14.02.0318.004; Thu, 22 Aug 2013 14:00:10 -0500 From: "Pascal Thubert (pthubert)" To: Qin Wang Thread-Topic: [6tsch] time parent selection based on EB priority Thread-Index: AQHOn0/DVeOseQSyNkOUAo0xL8C2jpmhZjgggABh+wD//8nm4A== Date: Thu, 22 Aug 2013 19:00:09 +0000 Deferred-Delivery: Thu, 22 Aug 2013 18:53:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.110.190] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD84142808Dxmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 19:00:40 -0000 --_000_E045AECD98228444A58C61C200AE1BD84142808Dxmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear Qin: I think the idea was to make sure that the roots are synchronized. Certainly the DODAGs may be a bit out of sync as we progress down, but we e= xpect that the guard time is sufficient. The alternate would be to sync the whole network completely independent of = RPL DAGs etc... eg using a GPS. There might be use cases where that is fine, but we need to document a defa= ult behavior that does not make the assumption of a GPS or similar. Makes sense? Cheers, Pascal From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: jeudi 22 ao=FBt 2013 19:03 To: Pascal Thubert (pthubert) Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Pascal, It may bring in some complexity. Think about the case. DODAG1 and DODAG2 ar= e in a same instance, but have no shared nodes, thus may not be able sync w= ith each other. A new node (node-A) comes in, wants to join into the two D= ODAGs, in another word, want to jump between the two DODAGs. I believe nod= e-A has to change its time source parent and re-sync when it jump from one = DODAG to another. Right? Thank Qin On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) > wrote: I do not think so, Qin; but it is required that a node on one DODAG may jump onto the other, and to= do that, it is useful to monitoring candidates from both dodags. Note that DODAGs partition the network, and all the parents must be in one = of them. Cheers; Pascal From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: jeudi 22 ao=FBt 2013 17:54 To: Pascal Thubert (pthubert) Cc: xvilajosana@eecs.berkeley.edu; Th= omas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi Pascal, Is it assumed that 2 DODAG in a same instance must have at least one shared= node? Thanks Qin On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) > wrote: Hello Xavi: The problem is that we have 2 mechanisms that establish a distance to the r= oot in order to avoid loops, RPL Rank and 4e priority. Fact is, RPL is probably more elaborate for loop detection and loop avoidan= ce. I suspect that the priority can easily count to infinity. So I'd trust RPL Rank rather than priority, and we seem to agree that we wa= nt to time sync with RPL parents. a) My question is whether it makes sense and value to have a transition bet= ween a time source based on best (hop count) priority and to one based on b= est RPL Rank, or if we could use the rank right away. Seems to me that life= would be easier if we use the Rank right away, though it may make the netw= ork a bit slower to come up. Passing from one mode to the other will demand= some specifications, what if one node reboots and goes from one mode to th= e other, etc... Now if the question is to reuse the priority field, then we can do actually= change the logic to accommodate priority =3D DAGRank(Rank) for nodes that = are not root, still ensuring that only a node that is already part of a RPL= DAG may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255) >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to DAGRank(Rank) that is < 255. Children sync to whichever prio < 255 neighbor as time source, listen to DI= Os, select a parent, migrate to that parent as time source, and then can se= t their own priority to zero and send DIOs. If later they select a better p= arent the priority will get lower so that's till OK. Would that fly? b) about multiple DAGs, there are 2 cases: - 2 DODAGs in a same instance. We said we want to support that, and that im= plies that the various DODAGs are closely time sync'd. - 2 DODAGs in 2 different instances. To be discussed. We have use cases whe= re that could be useful, one instance playing basic slotted aloha and the o= ther doing more critical jobs. We have not agreed on the latter but with a single radio, it seems problema= tic if the 2 instances do not share a same sense of time. We'd end up with = slot frames that may drift from one another, sometimes overlapping... I sus= pect that we'd partition time inside a slot frame or using multiple slot fr= ames, but we'd keep them in sync. Probably there is a need for a spanning i= nstance (0) for (autonomic) management etc... that uses something very simp= le, always on, very much like your basic draft. If there is such a spanning= instance, then it can be used to sync everyone, in which casethe Rank from= the dependent instances is not used for time sync. What do others think? Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: jeudi 22 ao=FBt 2013 15:34 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi Pascal, my comment inline: [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? yes that would work but we are doing the same as the IEEE802-15.4e Join pri= ority field is for. The 15.4e defines this mechanism and it is inherent to = the networks we address so using it is straightforward. Then as described b= y Thomas, we only need to use RPL best parent as soon as we have one instea= d of the lowest prio neighbor. Another question with time sources is the selection of a time source parent= in the case that a node belongs to more than one DODAG. Which parent is se= lected then? An more importantly, do the basic draft considers having more = than one DODAG? thanks! Xavi On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) > wrote: Dear all: As you know, RPL may entail temporary loops, in particular if DAGMaxRankInc= rease is not configured to 0. If as we expect we use the RPL preferred parent tree for time sync, this wi= ll lead to time sync loops. Two questions here: 1) how bad is the effect of such loop? I expect that the clocks will deriv= e rapidly, as if from the perspective of a node the crystal was real, real = bad. 2) can we detect that effect and use it to detect a loop in the routing? Please see inline: sch] time parent selection based on EB priority Qin, Xavi, Excellent point. I believe that this is exactly what makes this 6TSCH work = so interesting: figuring out how consolidate the views between upper and lo= wer layers. In my mind, the join priority as you describe looks very much like a DAGran= k. I believe there are, however, two potential questions we should not forg= et: - what if the joining mote does no get all of the EBs of its neighbor? - what happens when the topology changes and a node moves up or down in the= DODAG? I would suggest the following: - once the node has fully joined, somehow tie the join priority to its RPL = DAGrank. We might have to play with the metric to make the join priority lo= ok like a hop count, but I believe it is important the announced join prior= ity changes when the mote moves up/down in the topology. - maybe consider the time source parent identified during the joining as te= mporary until the final time source parent is discovered. How the final one= is discovered can through some command from the ME (see Qin's attachement)= , or after receiving many DIOs. [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? Cheers, Pascal On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang > wrote: Agree! Qin On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen > wrote: HI Qin, as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest. cheers! X On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang > wrote: Hi Xavi, It is a good idea to use Priority in EB as a factor to choose initial time = parent. But, I think there are several ways to use the Priority, and other = metrics like RSSI. For example, (1) As you suggested, use Priority first, and then RSSI (2) or use RSSI first, and then Priority (3) or use a function of Priority and RSSI. I'm not sure which is better. What do you think? Qin On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen > wrote: Hi all, I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB sele= cts as a time parent the node with lowest EB Join Priority. In case of rece= iving multiple EBs with the same Join priority then filters by other metric= s e.g RSSI of the link. (note that until a DIO is received nodes don not kn= ow about the gradient). A node when sends an EB uses the lowest EB Join priority it has heard and a= dds 1 to it as its own Join priority. Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e pro= vides to us. what is your opinion? thanks! Xavi _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD84142808Dxmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Dear Qin:

     <= /p>

    I think the idea was to m= ake sure that the roots are synchronized.

    Certainly the DODAGs may = be a bit out of sync as we progress down, but we expect that the guard time= is sufficient.

    The alternate would be to= sync the whole network completely independent of RPL DAGs etc… eg us= ing a GPS.

    There might be use cases = where that is fine, but we need to document a default behavior that does no= t make the assumption of a GPS or similar.

     <= /p>

    Makes sense?

     <= /p>

    Cheers,=

     <= /p>

    Pascal

     <= /p>

    From: Qin Wang= [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 19:03
    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority=

     

    Pascal,

     

    It may bring in some complexity. Think about the cas= e. DODAG1 and DODAG2 are in a same instance, but have no shared nodes, thus= may not be able sync with each other.  A new node (node-A) comes in, = wants to join into the two DODAGs, in another word, want to jump between the two DODAGs.  I believe node-A has to c= hange its time source parent and re-sync when it jump from one DODAG to ano= ther. Right?

     

    Thank

    Qin

     

     

     

     

    On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    I do not think so, Qin;

     

    but it is required that a node on one D= ODAG may jump onto the other, and to do that, it is useful to monitoring candidates from both dodags.

    Note that DODAGs partition the network,= and all the parents must be in one of them.

     

    Cheers;

     

    Pascal

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 17:54
    To: Pascal Thubert (pthubert)
    Cc:     xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] time parent selection based on EB priority=

     

    Hi Pascal,

     

    Is it assumed that 2 DODAG in a same instance must have at least o= ne shared node?

     

    Thanks

    Qin

     

    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    The problem is that we have 2 mechanism= s that establish a distance to the root in order to avoid loops, RPL Rank and 4e priority.

    Fact is, RPL is probably more elaborate= for loop detection and loop avoidance. I suspect that the priority can easily count to infinity.

    So I’d trust RPL Rank rather than= priority, and we seem to agree that we want to time sync with RPL parents.

     

    a) My question is whether it makes sens= e and value to have a transition between a time source based on best (hop count) priority and to one based on best RPL Rank, or if we c= ould use the rank right away. Seems to me that life would be easier if we u= se the Rank right away, though it may make the network a bit slower to come= up. Passing from one mode to the other will demand some specifications, what if one node reboots and goes f= rom one mode to the other, etc…

     

    Now if the question is to reuse the pri= ority field, then we can do actually change the logic to accommodate priority =3D DAGRank(Rank) for nodes that are not root, still ensuring tha= t only a node that is already part of a RPL DAG may be used as time source.=

    Initially only the root would be priori= ty 0. All the others would be default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255)

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to DAGRank(= Rank) that is < 255.

    Children sync to whichever prio < 25= 5 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs. If later they select a better parent the priority will get = lower so that’s till OK.

    Would that fly?

    b) about multiple DAGs, there are 2 cas= es:

    - 2 DODAGs in a same instance. We said = we want to support that, and that implies that the various DODAGs are closely time sync’d.

    - 2 DODAGs in 2 different instances. To= be discussed. We have use cases where that could be useful, one instance playing basic slotted aloha and the other doing more critical= jobs.

     

    We have not agreed on the latter but wi= th a single radio, it seems problematic if the 2 instances do not share a same sense of time. We’d end up with slot frames that= may drift from one another, sometimes overlapping… I suspect that we= ’d partition time inside a slot frame or using multiple slot frames, = but we’d keep them in sync. Probably there is a need for a spanning instance (0) for (autonomic) management etc… that use= s something very simple, always on, very much like your basic draft. If the= re is such a spanning instance, then it can be used to sync everyone, in wh= ich casethe Rank from the dependent instances is not used for time sync.

    What do others think?=

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

     

    Hi Pascal,

     

    my comment inline:

     

    [Pascal] Yes, I read Xavi’s propo= sal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time = sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority = as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 1.

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neigh= bor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    y= es that would work but we are doing the same as the IEEE802-15.4e Join prio= rity field is for. The 15.4e defines this mechanism and it is inherent to the networks we address so using it is straightforward. The= n as described by Thomas, we only need to use RPL best parent as soon as we= have one instead of the lowest prio neighbor. 

    A= nother question with time sources is the selection of a time source parent = in the case that a node belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic draft considers= having more than one DODAG? 

    t= hanks!
    Xavi

     

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) <pthubert@cisco.com= > wrote:

    Dear all:

     

    As you know, RPL may entail temporary l= oops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use the RPL preferre= d parent tree for time sync, this will lead to time sync loops.

    Two questions here:

    1) how bad is the effect of such loop? = I expect that the clocks  will derive rapidly, as if from the perspective of a node the crystal was real, real bad.

    2) can we detect that effect and use it= to detect a loop in the routing?

     

    Please see inline:

     

    sch] time parent selection based on EB priority=

     

    Qin, Xavi,

     

    Excellent point. I believe that this is exactly what makes this 6T= SCH work so interesting: figuring out how consolidate the views between upp= er and lower layers.

     

    In my mind, the join priority as you describe looks very much like= a DAGrank. I believe there are, however, two potential questions we should= not forget:

    - what if the joining mote does no get all of the EBs of its neigh= bor?

    - what happens when the topology changes and a node moves up or do= wn in the DODAG?

     

    I would suggest the following:

    - once the node has fully joined, somehow tie the join priority to= its RPL DAGrank. We might have to play with the metric to make the join pr= iority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified during the join= ing as temporary until the final time source parent is discovered. How the = final one is discovered can through some command from the ME (see Qin's attachement), or after receiving many = DIOs.

     

    [Pascal] Yes, I read Xavi’s propo= sal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time = sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority = as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 1.

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neigh= bor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

     

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

     

    Qin

     

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

     

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:<= o:p>

    Hi Xavi,

     

    It is a good idea to use Priority in EB as a factor to choose init= ial time parent. But, I think there are several ways to use the Priority, a= nd other metrics like RSSI. For example,

     

    (1) As you suggested, use Priority first, and then RSSI=

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

     

    I'm not sure which is better. What do you think?

     

    Qin

     

     

    On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an EB uses the lowest EB Join priority it has heard an= d adds 1 to it as its own Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

     

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    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


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    --_000_E045AECD98228444A58C61C200AE1BD84142808Dxmbrcdx01ciscoc_-- From pthubert@cisco.com Thu Aug 22 12:00:46 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E7DB011E8220 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 12:00:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.968 X-Spam-Level: X-Spam-Status: No, score=-9.968 tagged_above=-999 required=5 tests=[AWL=-0.570, BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_33=0.6, J_CHICKENPOX_44=0.6, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Mjsuw23HiZMI for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 12:00:40 -0700 (PDT) Received: from rcdn-iport-3.cisco.com (rcdn-iport-3.cisco.com [173.37.86.74]) by ietfa.amsl.com (Postfix) with ESMTP id 29A9911E8229 for <6tsch@ietf.org>; Thu, 22 Aug 2013 12:00:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=17994; q=dns/txt; s=iport; t=1377198034; x=1378407634; h=from:to:cc:subject:date:message-id:mime-version; bh=LTH6vU0CF57v/0/Qe9MlmHWyXg8PtbVeBZH3C3b1Opg=; b=gjgzpKabkY6vfOOL6OnLu6BlQGN1frGNCUz40DHihCYdLC8HsvZiFXrV hQ4YFEZyr/W7LfX1tre90d9Az/lGjADrWZhMMJUeGQ7RaRvNPKDTMEqBK XP+Qv5KHAoi+gnOPjgkQGGVQHdav3u9+6ShEVtjxTOostTeGQ+l0RTce/ 4=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqMFAH9fFlKtJV2c/2dsb2JhbABQCg6CNUQ1Ubc9iE2BHRZ0giQBAQEEAQEBKkELEgEIEQQBAQsdLgsUCQkBBAENBQiICAy2cY8jgRItBAYHgxV7A4VIgy6QHZAtgmA/gis X-IronPort-AV: E=Sophos;i="4.89,935,1367971200"; d="scan'208,217";a="250625217" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by rcdn-iport-3.cisco.com with ESMTP; 22 Aug 2013 19:00:13 +0000 Received: from xhc-aln-x08.cisco.com (xhc-aln-x08.cisco.com [173.36.12.82]) by rcdn-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id r7MJ0CqK000764 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 22 Aug 2013 19:00:12 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-aln-x08.cisco.com ([173.36.12.82]) with mapi id 14.02.0318.004; Thu, 22 Aug 2013 14:00:12 -0500 From: "Pascal Thubert (pthubert)" To: "xvilajosana@eecs.berkeley.edu" , "Thomas Watteyne" Thread-Topic: [6tsch] data structure and format for management packets Thread-Index: Ac6faSgvblQph/uGQoyK5ta9I1QlGw== Date: Thu, 22 Aug 2013 19:00:11 +0000 Deferred-Delivery: Thu, 22 Aug 2013 18:56:00 +0000 Message-ID: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.61.110.190] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD841428092xmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 19:00:46 -0000 --_000_E045AECD98228444A58C61C200AE1BD841428092xmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Perfect sync : ) The questions top down are which device talks to which devices and to expre= ss what. Now it's good to have an idea of the formalism we expect to be using to mak= e sure that it fits as we refine our work. Carsten will participate to the call tomorrow to present CBOR. Cheers, Pascal From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of X= avier Vilajosana Guillen Sent: mardi 20 ao=FBt 2013 15:29 To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] data structure and format for management packets Hi, one cent more to what Thomas says. IMHO, the most important thing is the content and secondary is the represen= tation, at least at that time. So my feeling is that we need first to ident= ify the content, and later express it json,bson or any other compressed for= mat. One possible way to think on that is go in a two way approach, bottom up an= d top down, i.e someone needs to describe what the PCE,etc .. need, another= can take the 6top commands and go up from there. From this two specificati= ons we will be able to identify what is missing and how to match things. just thoughts. X On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne > wrote: Qin, Thanks for starting the thread! I have comment which my sound a bit vague, = but it's on purpose :) Do you envision that the flows will match the 6tos commands exactly? That i= s, are you considering that the packets sent between different devices in t= he network (PCE, motes, etc) contain the same commands as the 6top set of c= ommands from http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.= 4? Maybe we could by identifying the flows that we are considering, then the c= ontents of those packets (possibly described using some high level represen= tation such as JSON), and only then worry about their efficient representat= ion (e.g. BSON). Just a thought. Thomas On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang > wrote: Hi Kris, You are right. Security Key should be a structured data, besides the key ma= terial, it should includes something like lifetime, KeyID, .....Correct? Many thanks! Qin On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister > wrote: is the security key a string? That doesn't seem right. ksjp On 8/19/2013 2:05 PM, Qin Wang wrote: Hi all, I separate a thread from thread "Message Flows", to discuss the format for = management messages, e.g. JSON, BSON, or others. As Thomas's suggestion, before delving into the representation of the infor= mation, we firstly identify what the contents of the different signaling pa= ckets are, and in addition, what the data structures they may use. I would like to take the commands defined in draft-wang-6tsch-6top-00 as st= arting point. Here are the parameters in those commands. //integer (1) xxxID, e.g. TrackID, SlotframeID (2) xxxOffset, e.g. SlotOffset (3) NumOfxxx/Length (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority (5) Status (6) ASN (5Byte integer), e.g. last time when a packet received from a neigh= bor //string (7) L2 address (8) SecurityKey //bitmap (9) LinkOption //floating (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics Maybe something else........ Now, we can evaluate different representation methods. What do you think? Thanks Qin _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD841428092xmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Perfect sync : )=

     <= /p>

    The questions top down ar= e which device talks to which devices and to express what.

    Now it’s good to ha= ve an idea of the formalism we expect to be using to make sure that it fits= as we refine our work.

    Carsten will participate = to the call tomorrow to present CBOR.

     <= /p>

    Cheers,=

     <= /p>

    Pascal<= /p>

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: mardi 20 ao=FBt 2013 15:29
    To: Thomas Watteyne
    Cc: 6tsch@ietf.org
    Subject: Re: [6tsch] data structure and format for management packet= s

     

    Hi, one cent more to what Thomas says.

     

    IMHO, the most important thing is the content and se= condary is the representation, at least at that time. So my feeling is that= we need first to identify the content, and later express it json,bson or a= ny other compressed format.

     

    One possible way to think on that is go in a two way= approach, bottom up and top down, i.e someone needs to describe what the P= CE,etc .. need, another can take the 6top commands and go up from there. Fr= om this two specifications we will be able to identify what is missing and how to match things. 

     

    just thoughts.

    X

     

    On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne &l= t;watteyne@= eecs.berkeley.edu> wrote:

    Qin,

     

    Thanks for starting the thread! I have comment which= my sound a bit vague, but it's on purpose :)

     

    Do you envision that the flows will match the 6tos c= ommands exactly? That is, are you considering that the packets sent between= different devices in the network (PCE, motes, etc) contain the same comman= ds as the 6top set of commands from http://tools.ie= tf.org/html/draft-wang-6tsch-6top-00#section-2.4?

     

    Maybe we could by identifying the flows that we are = considering, then the contents of those packets (possibly described using s= ome high level representation such as JSON), and only then worry about thei= r efficient representation (e.g. BSON). Just a thought.

     

    Thomas

     

    On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Kris,

     

    You are right. Security Key should be a structured d= ata, besides the key material, it should includes something like lifetime, = KeyID, .....Correct?

     

    Many thanks!

     

    Qin

     

    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@berkeley.edu&g= t; wrote:

    is the security key a string?  That doesn't see= m right.

    ksjp

     

    On 8/19/2013 2:05 PM, Qin Wang wrote:

    Hi all,

     

    I separate a thread from thread "Message Flows&= quot;, to discuss the format for management messages, e.g. JSON, BSON, or o= thers.

     

    As Thomas's suggestion, before delving in= to the representation of the information, we firstly identify what the cont= ents of the different signaling packets are, and in addition, what the data structures they may use. 

     

    I would like to take the commands defined in dr= aft-wang-6tsch-6top-00 as starting point. Here are the parameters in those = commands.

     

    //integer

    (1) xxxID, e.g. TrackID, SlotframeID

    (2) xxxOffset, e.g. SlotOffset

    (3) NumOfxxx/Length

    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority = ;

    (5) Status

    (6) ASN (5Byte integer), e.g. last time when a packe= t received from a neighbor

     

    //string

    (7) L2 address

    (8) SecurityKey

     

    //bitmap

    (9) LinkOption

     

    //floating

    (10) Metrics, e.g. PDR, ETX, queuing statistics, ene= rgy-related metrics

     

    Maybe something else........

     

    Now, we can evaluate different representation method= s. What do you think?

     

    Thanks

    Qin

     

     

      

     

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org=

    https://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
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    --_000_E045AECD98228444A58C61C200AE1BD841428092xmbrcdx01ciscoc_-- From twatteyne@gmail.com Thu Aug 22 16:11:10 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5AE7211E8269 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 16:11:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.618 X-Spam-Level: X-Spam-Status: No, score=-1.618 tagged_above=-999 required=5 tests=[AWL=-0.241, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_42=0.6, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dpdn3SeK0tMB for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 16:11:08 -0700 (PDT) Received: from mail-pa0-x231.google.com (mail-pa0-x231.google.com [IPv6:2607:f8b0:400e:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id F319211E8251 for <6tsch@ietf.org>; Thu, 22 Aug 2013 16:11:05 -0700 (PDT) Received: by mail-pa0-f49.google.com with SMTP id ld10so2729024pab.22 for <6tsch@ietf.org>; Thu, 22 Aug 2013 16:11:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=vmwaWRF9gRKxvtrNRiAaX5wuY61ViZqN5ahHAVeo0DE=; b=OgurfLpjeqMUkEwLsQnhe8eQwZCDsTFW4T3UWqREleyufs5Wr3hjXz0+Bf84PlQeSe 72tR43TaVx2q17XceSJD5Ob/ARIlh4TmdCRDJpZv26LBllJk/K/n2XsONUvJXTaNCedv EfEBi9AzSiL7Zfm1qoGLBBt9ldExNbv0vuwYRcfGRldjG575KYqEWQV6OchRErhB5gtH EJ67VUvmvg1yG3Qx5Jpm2D62JB6WNk4qlVs2qFs2WX6hfTK7RqajrBdItAZZvLHeMwxz +Hnx511yANll4Z8Z7bvrasVK5cvDGQ4uF/mC8TksYK3hANIT2TyZsrQHP+Fd9wiSEOnJ 8sew== X-Received: by 10.68.241.6 with SMTP id we6mr7951058pbc.174.1377213065618; Thu, 22 Aug 2013 16:11:05 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Thu, 22 Aug 2013 16:10:45 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Thu, 22 Aug 2013 16:10:45 -0700 X-Google-Sender-Auth: kN8aY-uUUTMpZD7VCZJKoz661B8 Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b33c72e8e695604e49167b5 Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 23:11:10 -0000 --047d7b33c72e8e695604e49167b5 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable All, Summarizing the different things we are talking about in this thread: 1. picking time source neighbors during the operation of the network. Proposal is to use the (loop-free) RPL DAG. Challenged by Raghuram who wants to have separate L2 and L3 behavior because of race conditions. 2. picking time source neighbors during join process. Proposal is to attach to the node which indicates the lowest join priority in EB. Question is whether join priority reflects DAGrank or not. 3. multiple DODAGs: keeping DAGroots sync'ed or participating in several independent time bases. My opinion is: 1. I believe keeping the same DAG structure the same between L2 and L3 makes sense. If there is no L2 connectivity, L3 cannot function since it can not speak to and hear the neighbors, so I'm afraid I don't quite follow the race condition issue. 2. My inclination is to have the join priority be an indication of the DAGrank, possible by "rounding off". When joining, a new node will join L2 (i.e. synchronize) as soon as it hears EBs, then join L3 (i.e, acquire a DAGrank) after hearing DIOs. I would have the node transmit EBs only after that last step. 3. My opinion is that, for now, we should take the multiple root case into account, but only if they are synchronized through some out-of-band mechanism. Raw opinions, up for discussion :) Thomas On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Dear Qin:**** > > ** ** > > I think the idea was to make sure that the roots are synchronized.**** > > Certainly the DODAGs may be a bit out of sync as we progress down, but we > expect that the guard time is sufficient.**** > > The alternate would be to sync the whole network completely independent o= f > RPL DAGs etc=85 eg using a GPS.**** > > There might be use cases where that is fine, but we need to document a > default behavior that does not make the assumption of a GPS or similar.**= * > * > > ** ** > > Makes sense?**** > > ** ** > > Cheers,**** > > ** ** > > Pascal**** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 19:03 > > *To:* Pascal Thubert (pthubert) > *Cc:* xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > ** ** > > Pascal,**** > > ** ** > > It may bring in some complexity. Think about the case. DODAG1 and DODAG2 > are in a same instance, but have no shared nodes, thus may not be able sy= nc > with each other. A new node (node-A) comes in, wants to join into the tw= o > DODAGs, in another word, want to jump between the two DODAGs. I believe > node-A has to change its time source parent and re-sync when it jump from > one DODAG to another. Right?**** > > ** ** > > Thank**** > > Qin**** > > ** ** > > ** ** > > ** ** > > ** ** > > On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > I do not think so, Qin; **** > > **** > > but it is required that a node on one DODAG may jump onto the other, and > to do that, it is useful to monitoring candidates from both dodags.**** > > Note that DODAGs partition the network, and all the parents must be in on= e > of them.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 17:54 > *To:* Pascal Thubert (pthubert) > *Cc:* xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > **** > > Hi Pascal,**** > > **** > > Is it assumed that 2 DODAG in a same instance must have at least one > shared node?**** > > **** > > Thanks**** > > Qin**** > > **** > > On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > The problem is that we have 2 mechanisms that establish a distance to the > root in order to avoid loops, RPL Rank and 4e priority.**** > > Fact is, RPL is probably more elaborate for loop detection and loop > avoidance. I suspect that the priority can easily count to infinity.**** > > So I=92d trust RPL Rank rather than priority, and we seem to agree that w= e > want to time sync with RPL parents.**** > > **** > > a) My question is whether it makes sense and value to have a transition > between a time source based on best (hop count) priority and to one based > on best RPL Rank, or if we could use the rank right away. Seems to me tha= t > life would be easier if we use the Rank right away, though it may make th= e > network a bit slower to come up. Passing from one mode to the other will > demand some specifications, what if one node reboots and goes from one mo= de > to the other, etc=85**** > > **** > > Now if the question is to reuse the priority field, then we can do > actually change the logic to accommodate priority =3D DAGRank(Rank) for n= odes > that are not root, still ensuring that only a node that is already part o= f > a RPL DAG may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease o= f > 255)**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to DAGRank(Rank) that is < 255.**** > > Children sync to whichever prio < 255 neighbor as time source, listen to > DIOs, select a parent, migrate to that parent as time source, and then ca= n > set their own priority to zero and send DIOs. If later they select a bett= er > parent the priority will get lower so that=92s till OK.**** > > Would that fly?**** > > b) about multiple DAGs, there are 2 cases:**** > > - 2 DODAGs in a same instance. We said we want to support that, and that > implies that the various DODAGs are closely time sync=92d.**** > > - 2 DODAGs in 2 different instances. To be discussed. We have use cases > where that could be useful, one instance playing basic slotted aloha and > the other doing more critical jobs. **** > > **** > > We have not agreed on the latter but with a single radio, it seems > problematic if the 2 instances do not share a same sense of time. We=92d = end > up with slot frames that may drift from one another, sometimes overlappin= g=85 > I suspect that we=92d partition time inside a slot frame or using multipl= e > slot frames, but we=92d keep them in sync. Probably there is a need for a > spanning instance (0) for (autonomic) management etc=85 that uses somethi= ng > very simple, always on, very much like your basic draft. If there is such= a > spanning instance, then it can be used to sync everyone, in which casethe > Rank from the dependent instances is not used for time sync.**** > > What do others think?**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 15:34 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > **** > > Hi Pascal,**** > > **** > > my comment inline:**** > > **** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0.**** > > Q: Do we really need to build the time sync tree faster than the RPL grap= h? > **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > yes that would work but we are doing the same as the IEEE802-15.4e Join > priority field is for. The 15.4e defines this mechanism and it is inheren= t > to the networks we address so using it is straightforward. Then as > described by Thomas, we only need to use RPL best parent as soon as we ha= ve > one instead of the lowest prio neighbor. **** > > Another question with time sources is the selection of a time source > parent in the case that a node belongs to more than one DODAG. Which pare= nt > is selected then? An more importantly, do the basic draft considers havin= g > more than one DODAG? **** > > thanks! > Xavi**** > > **** > > On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Dear all:**** > > **** > > As you know, RPL may entail temporary loops, in particular if > DAGMaxRankIncrease is not configured to 0.**** > > If as we expect we use the RPL preferred parent tree for time sync, this > will lead to time sync loops. **** > > Two questions here:**** > > 1) how bad is the effect of such loop? I expect that the clocks will > derive rapidly, as if from the perspective of a node the crystal was real= , > real bad.**** > > 2) can we detect that effect and use it to detect a loop in the routing?*= * > ** > > **** > > Please see inline:**** > > **** > > sch] time parent selection based on EB priority**** > > **** > > Qin, Xavi,**** > > **** > > Excellent point. I believe that this is exactly what makes this 6TSCH wor= k > so interesting: figuring out how consolidate the views between upper and > lower layers.**** > > **** > > In my mind, the join priority as you describe looks very much like a > DAGrank. I believe there are, however, two potential questions we should > not forget:**** > > - what if the joining mote does no get all of the EBs of its neighbor?***= * > > - what happens when the topology changes and a node moves up or down in > the DODAG?**** > > **** > > I would suggest the following:**** > > - once the node has fully joined, somehow tie the join priority to its RP= L > DAGrank. We might have to play with the metric to make the join priority > look like a hop count, but I believe it is important the announced join > priority changes when the mote moves up/down in the topology.**** > > - maybe consider the time source parent identified during the joining as > temporary until the final time source parent is discovered. How the final > one is discovered can through some command from the ME (see Qin's > attachement), or after receiving many DIOs.**** > > **** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0. **** > > Q: Do we really need to build the time sync tree faster than the RPL > graph? **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > Cheers,**** > > Pascal**** > > **** > > On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang wrote:**= * > * > > Agree!**** > > **** > > Qin**** > > **** > > On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > HI Qin, > > as a basic setting we want the most basic approach. I guess that using (1= ) > first priority and then RSSi will avoid having loops. As you say all this > approaches would work but I bet for (1) to be the simplest. **** > > cheers! > X**** > > **** > > On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote:*= * > ** > > Hi Xavi,**** > > **** > > It is a good idea to use Priority in EB as a factor to choose initial tim= e > parent. But, I think there are several ways to use the Priority, and othe= r > metrics like RSSI. For example,**** > > **** > > (1) As you suggested, use Priority first, and then RSSI**** > > (2) or use RSSI first, and then Priority**** > > (3) or use a function of Priority and RSSI.**** > > **** > > I'm not sure which is better. What do you think?**** > > **** > > Qin**** > > **** > > **** > > On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > Hi all, > > I want to propose to add in the basic TSCH draft the fact that when a nod= e > joins a network, it uses the EB join priority defined in the Slot and Lin= k > IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority = is > 0 for the PAN coordinator of the network. A node listening several EB > selects as a time parent the node with lowest EB Join Priority. In case o= f > receiving multiple EBs with the same Join priority then filters by other > metrics e.g RSSI of the link. (note that until a DIO is received nodes do= n > not know about the gradient).**** > > A node when sends an EB uses the lowest EB Join priority it has heard and > adds 1 to it as its own Join priority. > > > Current draft section states that RSSI or another metric should be used t= o > select the initial time parent, this has the problem that loops cannot be > avoided until the first DIO is received. With the proposed approach the > problem is solved and does not introduce anything new, just used what 15.= 4e > provides to us.**** > > what is your opinion?**** > > thanks! > Xavi**** > > **** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > ** ** > --047d7b33c72e8e695604e49167b5 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    All,

    Summarizing the different things w= e are talking about in this thread:
    1. picking time source neighb= ors during the operation of the network. Proposal is to use the (loop-free)= RPL DAG. Challenged by Raghuram who wants to have separate L2 and L3 behav= ior because of race conditions.
    2. picking time source neighbors during join process. Proposal is to a= ttach to the node which indicates the lowest join priority in EB. Question = is whether join priority reflects DAGrank or not.
    3. multiple DOD= AGs: keeping DAGroots sync'ed or participating in several independent t= ime bases.

    My opinion is:
    1. I believe keeping the same = DAG structure the same between L2 and L3 makes sense. If there is no L2 con= nectivity, L3 cannot function since it can not speak to and hear the neighb= ors, so I'm afraid I don't quite follow the race condition issue.
    2. My inclination is to have the join priority be an indication of the= DAGrank, possible by "rounding off". When joining, a new node wi= ll join L2 (i.e. synchronize) as soon as it hears EBs, then join L3 (i.e, a= cquire a DAGrank) after hearing DIOs. I would have the node transmit EBs on= ly after that last step.
    3. My opinion is that, for now, we should take the multiple root case = into account, but only if they are synchronized through some out-of-band me= chanism.

    Raw opinions, up for discussion :)

    Thomas

    On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert= ) <pthubert@cisco.com> wrote:

    Dear Qin:

    =A0<= /p>

    I think the idea was to m= ake sure that the roots are synchronized.

    Certainly the DODAGs may = be a bit out of sync as we progress down, but we expect that the guard time= is sufficient.

    The alternate would be to= sync the whole network completely independent of RPL DAGs etc=85 eg using = a GPS.

    There might be use cases = where that is fine, but we need to document a default behavior that does no= t make the assumption of a GPS or similar.

    =A0<= /p>

    Makes sense?

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 19:03


    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Pascal,

    =A0

    It may bring in some complexity. Think about the cas= e. DODAG1 and DODAG2 are in a same instance, but have no shared nodes, thus= may not be able sync with each other. =A0A new node (node-A) comes in, wan= ts to join into the two DODAGs, in another word, want to jump between the two DODAGs. =A0I believe node-A has to chan= ge its time source parent and re-sync when it jump from one DODAG to anothe= r. Right?

    =A0

    Thank

    Qin

    =A0

    =A0

    =A0

    =A0

    On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    I do not think so, Qi= n;

    =A0<= /p>

    but it is required that a= node on one DODAG may jump onto the other, and to do that, it is useful to monitoring candidates from both dodags.

    Note that DODAGs partitio= n the network, and all the parents must be in one of them.=

    =A0<= /p>

    Cheers;<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 17:54
    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi Pascal,

    =A0

    Is it assumed that 2 DODAG in a same instance must h= ave at least one shared node?

    =A0

    Thanks

    Qin

    =A0

    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

    =A0<= /p>

    The problem is that we ha= ve 2 mechanisms that establish a distance to the root in order to avoid loops, RPL Rank and 4e priority.

    Fact is, RPL is probably = more elaborate for loop detection and loop avoidance. I suspect that the priority can easily count to infinity.

    So I=92d trust RPL Rank r= ather than priority, and we seem to agree that we want to time sync with RP= L parents.

    =A0<= /p>

    a) My question is whether= it makes sense and value to have a transition between a time source based on best (hop count) priority and to one based on best RPL Rank, or if we c= ould use the rank right away. Seems to me that life would be easier if we u= se the Rank right away, though it may make the network a bit slower to come= up. Passing from one mode to the other will demand some specifications, what if one node reboots and goes f= rom one mode to the other, etc=85

    =A0<= /p>

    Now if the question is to= reuse the priority field, then we can do actually change the logic to acco= mmodate priority =3D DAGRank(Rank) for nodes that are not root, still ensuring tha= t only a node that is already part of a RPL DAG may be used as time source.=

    Initially only the root w= ould be priority 0. All the others would be default 255 (that is DAGRank(IN= FINITE_RANK) assuming MinHopRankIncrease of 255)

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to DAGRank(= Rank) that is < 255.

    Children sync to whicheve= r prio < 255 neighbor as time source, listen to DIOs, select a parent, m= igrate to that parent as time source, and then can set their own priority to zero= and send DIOs. If later they select a better parent the priority will get = lower so that=92s till OK.

    Would that fly?

    b) about multiple DAGs, t= here are 2 cases:

    - 2 DODAGs in a same inst= ance. We said we want to support that, and that implies that the various DODAGs are closely time sync=92d.

    - 2 DODAGs in 2 different= instances. To be discussed. We have use cases where that could be useful, one instance playing basic slotted aloha and the other doing more critical= jobs.

    =A0<= /p>

    We have not agreed on the= latter but with a single radio, it seems problematic if the 2 instances do not share a same sense of time. We=92d end up with slot frames that may= drift from one another, sometimes overlapping=85 I suspect that we=92d par= tition time inside a slot frame or using multiple slot frames, but we=92d k= eep them in sync. Probably there is a need for a spanning instance (0) for (autonomic) management etc=85 that uses so= mething very simple, always on, very much like your basic draft. If there i= s such a spanning instance, then it can be used to sync everyone, in which = casethe Rank from the dependent instances is not used for time sync.

    What do others think?

    =A0<= /p>

    Pascal

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi Pascal,

    =A0

    my comment inline:

    =A0

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    yes that would work but w= e are doing the same as the IEEE802-15.4e Join priority field is for. The 1= 5.4e defines this mechanism and it is inherent to the networks we address so using it is straightforward. The= n as described by Thomas, we only need to use RPL best parent as soon as we= have one instead of the lowest prio neighbor.=A0

    Another question with tim= e sources is the selection of a time source parent in the case that a node = belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic draft considers= having more than one DODAG?=A0

    thanks!
    Xavi

    =A0

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pth= ubert) <pthubert= @cisco.com> wrote:

    Dear all:

    =A0<= /p>

    As you know, RPL may enta= il temporary loops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use th= e RPL preferred parent tree for time sync, this will lead to time sync loop= s.

    Two questions here:

    1) how bad is the effect = of such loop? I expect that the clocks=A0 will derive rapidly, as if from the perspective of a node the crystal was real, real bad.=

    2) can we detect that eff= ect and use it to detect a loop in the routing?

    =A0<= /p>

    Please see inline:=

    =A0<= /p>

    sch] time parent selection based on EB p= riority

    =A0

    Qin, Xavi,

    =A0

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

    =A0

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

    =A0

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME (see Qin's attachement), or after receiving m= any DIOs.

    =A0<= /p>

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

    =A0

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

    =A0

    Qin

    =A0

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

    =A0

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

    =A0

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

    =A0

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

    =A0

    I'm not sure which is better. What do you think?=

    =A0

    Qin

    =A0

    =A0

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

    =A0

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    --047d7b33c72e8e695604e49167b5-- From twatteyne@gmail.com Thu Aug 22 16:19:41 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F4E321F9D52 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 16:19:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.301 X-Spam-Level: X-Spam-Status: No, score=-1.301 tagged_above=-999 required=5 tests=[AWL=-0.524, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_33=0.6, J_CHICKENPOX_44=0.6, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uHRu7m9nu0Xr for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 16:19:40 -0700 (PDT) Received: from mail-pa0-x231.google.com (mail-pa0-x231.google.com [IPv6:2607:f8b0:400e:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id 5198321F9CC8 for <6tsch@ietf.org>; Thu, 22 Aug 2013 16:19:40 -0700 (PDT) Received: by mail-pa0-f49.google.com with SMTP id ld10so2721603pab.8 for <6tsch@ietf.org>; Thu, 22 Aug 2013 16:19:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=vyDoQmvA7oPc7iyeziNv0SMnkJ2hScnaQHqTaSlTxsM=; b=bcHgTxQmf7uZl9jk6stUnNivYa9puHSYZjzR61P9+wjALdSL0sIvJPZhBNK4vFWkEv gTt+bOgbrdf0PhFgTNhrLMlRqwdE1krQs3Kn5t2G4MYkf3NTNSpmekfDAfezuSAGJWu9 Op0rOeUVqPIMOq3AI0w57XvfksnybqHncB1cdMbdWdMbY7Pnmv0tbfGKKzJraO6HKebj 6P+KO5OkcN73xy1NoaNDBxb0mY5QVuBuJolJBw3ADF57Ucl2DlQWr9ZI2+kPL1CI0yPR byok8cVY3NhuF5G5Hw46MX4mM9x3kP9IUIbrAzRFXZrLykd6JFtB4WPwqseV8KxZNDHV K71A== X-Received: by 10.66.25.133 with SMTP id c5mr17570407pag.4.1377213580036; Thu, 22 Aug 2013 16:19:40 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Thu, 22 Aug 2013 16:19:19 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Thu, 22 Aug 2013 16:19:19 -0700 X-Google-Sender-Auth: dnWhTxJaPL6aV6rXLDccb2XCt1o Message-ID: To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=bcaec52bed0937d0ea04e49186a3 Cc: "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 23:19:41 -0000 --bcaec52bed0937d0ea04e49186a3 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Qin, I wasn't clear, sorry! What I mean is, if I'm a node in the network and suddently I feel like sending 10 pkts/s to a different node, how do I let the ME know to it can provision the slots? Thomas On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Perfect sync : )**** > > ** ** > > The questions top down are which device talks to which devices and to > express what.**** > > Now it=92s good to have an idea of the formalism we expect to be using to > make sure that it fits as we refine our work.**** > > Carsten will participate to the call tomorrow to present CBOR.**** > > ** ** > > Cheers,**** > > ** ** > > Pascal**** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Xavier Vilajosana Guillen > *Sent:* mardi 20 ao=FBt 2013 15:29 > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org > *Subject:* Re: [6tsch] data structure and format for management packets**= * > * > > ** ** > > Hi, one cent more to what Thomas says.**** > > ** ** > > IMHO, the most important thing is the content and secondary is the > representation, at least at that time. So my feeling is that we need firs= t > to identify the content, and later express it json,bson or any other > compressed format.**** > > ** ** > > One possible way to think on that is go in a two way approach, bottom up > and top down, i.e someone needs to describe what the PCE,etc .. need, > another can take the 6top commands and go up from there. From this two > specifications we will be able to identify what is missing and how to mat= ch > things. **** > > ** ** > > just thoughts.**** > > X**** > > ** ** > > On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > Qin,**** > > ** ** > > Thanks for starting the thread! I have comment which my sound a bit vague= , > but it's on purpose :)**** > > ** ** > > Do you envision that the flows will match the 6tos commands exactly? That > is, are you considering that the packets sent between different devices i= n > the network (PCE, motes, etc) contain the same commands as the 6top set o= f > commands from > http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4?**** > > ** ** > > Maybe we could by identifying the flows that we are considering, then the > contents of those packets (possibly described using some high level > representation such as JSON), and only then worry about their efficient > representation (e.g. BSON). Just a thought.**** > > ** ** > > Thomas**** > > ** ** > > On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote:**= * > * > > Hi Kris,**** > > ** ** > > You are right. Security Key should be a structured data, besides the key > material, it should includes something like lifetime, KeyID, .....Correct= ? > **** > > ** ** > > Many thanks!**** > > ** ** > > Qin**** > > ** ** > > On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote:**= * > * > > is the security key a string? That doesn't seem right. > > ksjp**** > > ** ** > > On 8/19/2013 2:05 PM, Qin Wang wrote:**** > > Hi all, **** > > ** ** > > I separate a thread from thread "Message Flows", to discuss the format fo= r > management messages, e.g. JSON, BSON, or others.**** > > ** ** > > As Thomas's suggestion, before delving into the representation of the > information, we firstly identify what the contents of the different > signaling packets are, and in addition, what the data structures they may > use. **** > > ** ** > > I would like to take the commands defined in draft-wang-6tsch-6top-00 as > starting point. Here are the parameters in those commands.**** > > ** ** > > //integer**** > > (1) xxxID, e.g. TrackID, SlotframeID**** > > (2) xxxOffset, e.g. SlotOffset**** > > (3) NumOfxxx/Length**** > > (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority **** > > (5) Status**** > > (6) ASN (5Byte integer), e.g. last time when a packet received from a > neighbor**** > > ** ** > > //string**** > > (7) L2 address**** > > (8) SecurityKey**** > > ** ** > > //bitmap**** > > (9) LinkOption**** > > ** ** > > //floating**** > > (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics**= * > * > > ** ** > > Maybe something else........**** > > ** ** > > Now, we can evaluate different representation methods. What do you think?= * > *** > > ** ** > > Thanks**** > > Qin**** > > ** ** > > ** ** > > **** > > ** ** > > _______________________________________________**** > > 6tsch mailing list**** > > 6tsch@ietf.org**** > > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > ** ** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --bcaec52bed0937d0ea04e49186a3 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Qin,

    I wasn't clear, sorry! What I = mean is, if I'm a node in the network and suddently I feel like sending= 10 pkts/s to a different node, how do I let the ME know to it can provisio= n the slots?

    Thomas


    On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (= pthubert) <pthubert@cisco.com> wrote:

    Perfect sync : )<= u>

    =A0<= /p>

    The questions top down ar= e which device talks to which devices and to express what.

    Now it=92s good to have a= n idea of the formalism we expect to be using to make sure that it fits as = we refine our work.

    Carsten will participate = to the call tomorrow to present CBOR.

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: mardi 20 ao=FBt 2013 15:29
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] data structure and format for management packet= s

    =A0

    Hi, one cent more to what Thomas says.=

    =A0

    IMHO, the most important thing is the content and se= condary is the representation, at least at that time. So my feeling is that= we need first to identify the content, and later express it json,bson or a= ny other compressed format.

    =A0

    One possible way to think on that is go in a two way= approach, bottom up and top down, i.e someone needs to describe what the P= CE,etc .. need, another can take the 6top commands and go up from there. Fr= om this two specifications we will be able to identify what is missing and how to match things.=A0<= /u>

    =A0

    just thoughts.

    X

    =A0

    On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne &l= t;watteyne@= eecs.berkeley.edu> wrote:

    Qin,

    =A0

    Thanks for starting the thread! I have comment which= my sound a bit vague, but it's on purpose :)

    =A0

    Do you envision that the flows will match the 6tos c= ommands exactly? That is, are you considering that the packets sent between= different devices in the network (PCE, motes, etc) contain the same comman= ds as the 6top set of commands from=A0http://tools.ietf.= org/html/draft-wang-6tsch-6top-00#section-2.4?

    =A0

    Maybe we could by identifying the flows that we are = considering, then the contents of those packets (possibly described using s= ome high level representation such as JSON), and only then worry about thei= r efficient representation (e.g. BSON). Just a thought.

    =A0

    Thomas

    =A0

    On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Kris,

    =A0

    You are right. Security Key should be a structured d= ata, besides the key material, it should includes something like lifetime, = KeyID, .....Correct?

    =A0

    Many thanks!

    =A0

    Qin

    =A0

    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@berkeley.edu&g= t; wrote:

    is the security key a string?=A0 That doesn't se= em right.

    ksjp

    =A0

    On 8/19/2013 2:05 PM, Qin Wang wrote:<= /p>

    Hi all,

    =A0

    I separate a thread from thread "Message Flows&= quot;, to discuss the format for management messages, e.g. JSON, BSON, or o= thers.

    =A0

    As Thomas's suggestion, before delvin= g into the representation of the information, we firstly identify what the = contents of the different signaling packets are, and in addition, what the data structures they may use.=A0

    =A0

    I would like to take the commands defined in=A0draft= -wang-6tsch-6top-00 as starting point. Here are the parameters in those com= mands.

    =A0

    //integer

    (1) xxxID, e.g. TrackID, SlotframeID

    (2) xxxOffset, e.g. SlotOffset

    (3) NumOfxxx/Length

    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0

    (5) Status

    (6) ASN (5Byte integer), e.g. last time when a packe= t received from a neighbor

    =A0

    //string

    (7) L2 address

    (8) SecurityKey

    =A0

    //bitmap

    (9) LinkOption

    =A0

    //floating

    (10) Metrics, e.g. PDR, ETX, queuing statistics, ene= rgy-related metrics

    =A0

    Maybe something else........

    =A0

    Now, we can evaluate different representation method= s. What do you think?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0=A0

    =A0

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org=

    https://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    --bcaec52bed0937d0ea04e49186a3-- From ksjp@berkeley.edu Thu Aug 22 16:22:21 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ED5AF11E8244 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 16:22:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_42=0.6] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FeTRNCt7qaxh for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 16:22:14 -0700 (PDT) Received: from mail-pd0-f176.google.com (mail-pd0-f176.google.com [209.85.192.176]) by ietfa.amsl.com (Postfix) with ESMTP id 0356D11E80EE for <6tsch@ietf.org>; Thu, 22 Aug 2013 16:22:13 -0700 (PDT) Received: by mail-pd0-f176.google.com with SMTP id q10so2529109pdj.35 for <6tsch@ietf.org>; Thu, 22 Aug 2013 16:22:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type; bh=zJjewoF/Yqww+lPOksJyFNHDdXf9hSA0Y39N9wB9Nlg=; b=CamanmH/rct1G5u1hrTUJSIykSzrBWZwBO+//bp7s8Rt0OtaV5eGK2UIs6aXclggqX VpKPNTkgcLbETuIGi3qLWTKb1qJenpowTKIni1ND9Z4zyr7Q21crkfNp1EczswAwmuzm C17DzPnZRwJN8lNJCb39WvF3+kiaty25jBm+tjqdQLhuo3Tz9dZHcGLwPIa5DDFtVBNR Y/r8hPyyL66gPSdguIp7T1NKZEgP3pierm1+DIazb/bBzfcJe5qjvo7MRN97bO7nRTSo Rv0/xt9nXrYUJOjBiIb21YUTArYPeFgVHMOtbHKP/cQewKNNrT7UIQdTATgKQVtUrnOV Q47w== X-Gm-Message-State: ALoCoQmg/pGwSqQei85hP5IjJNz5NSkF3JXi8josxxkjhFAHUC4Zj8ZdsHPSQq8h+v/3DN3ZeBa2 X-Received: by 10.66.194.13 with SMTP id hs13mr7949181pac.163.1377213733167; Thu, 22 Aug 2013 16:22:13 -0700 (PDT) Received: from [128.32.32.89] (dhcp-32-89.EECS.Berkeley.EDU. [128.32.32.89]) by mx.google.com with ESMTPSA id ut7sm17331837pbc.31.1969.12.31.16.00.00 (version=SSLv3 cipher=RC4-SHA bits=128/128); Thu, 22 Aug 2013 16:22:12 -0700 (PDT) Message-ID: <52169D3D.9030308@berkeley.edu> Date: Thu, 22 Aug 2013 16:22:37 -0700 From: Kris Pister User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: 6tsch@ietf.org References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------060401070709020509040203" Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 23:22:22 -0000 This is a multi-part message in MIME format. --------------060401070709020509040203 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit It is not unlikely that some motes in a network will have an accurate time source, such as GPS. It would be a shame to ignore the time information from a 1-hop neighbor with GPS just because it happened to be a child in the DODAG. ksjp On 8/22/2013 4:10 PM, Thomas Watteyne wrote: > All, > > Summarizing the different things we are talking about in this thread: > 1. picking time source neighbors during the operation of the network. > Proposal is to use the (loop-free) RPL DAG. Challenged by Raghuram who > wants to have separate L2 and L3 behavior because of race conditions. > 2. picking time source neighbors during join process. Proposal is to > attach to the node which indicates the lowest join priority in EB. > Question is whether join priority reflects DAGrank or not. > 3. multiple DODAGs: keeping DAGroots sync'ed or participating in > several independent time bases. > > My opinion is: > 1. I believe keeping the same DAG structure the same between L2 and L3 > makes sense. If there is no L2 connectivity, L3 cannot function since > it can not speak to and hear the neighbors, so I'm afraid I don't > quite follow the race condition issue. > 2. My inclination is to have the join priority be an indication of the > DAGrank, possible by "rounding off". When joining, a new node will > join L2 (i.e. synchronize) as soon as it hears EBs, then join L3 (i.e, > acquire a DAGrank) after hearing DIOs. I would have the node transmit > EBs only after that last step. > 3. My opinion is that, for now, we should take the multiple root case > into account, but only if they are synchronized through some > out-of-band mechanism. > > Raw opinions, up for discussion :) > > Thomas > > On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) > > wrote: > > Dear Qin: > > I think the idea was to make sure that the roots are synchronized. > > Certainly the DODAGs may be a bit out of sync as we progress down, > but we expect that the guard time is sufficient. > > The alternate would be to sync the whole network completely > independent of RPL DAGs etc... eg using a GPS. > > There might be use cases where that is fine, but we need to > document a default behavior that does not make the assumption of a > GPS or similar. > > Makes sense? > > Cheers, > > Pascal > > *From:*Qin Wang [mailto:qinwang@berkeley.edu > ] > *Sent:* jeudi 22 août 2013 19:03 > > > *To:* Pascal Thubert (pthubert) > *Cc:* xvilajosana@eecs.berkeley.edu > ; Thomas Watteyne; > 6tsch@ietf.org > *Subject:* Re: [6tsch] time parent selection based on EB priority > > Pascal, > > It may bring in some complexity. Think about the case. DODAG1 and > DODAG2 are in a same instance, but have no shared nodes, thus may > not be able sync with each other. A new node (node-A) comes in, > wants to join into the two DODAGs, in another word, want to jump > between the two DODAGs. I believe node-A has to change its time > source parent and re-sync when it jump from one DODAG to another. > Right? > > Thank > > Qin > > On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) > > wrote: > > I do not think so, Qin; > > but it is required that a node on one DODAG may jump onto the > other, and to do that, it is useful to monitoring candidates from > both dodags. > > Note that DODAGs partition the network, and all the parents must > be in one of them. > > Cheers; > > Pascal > > *From:*Qin Wang [mailto:qinwang@berkeley.edu > ] > *Sent:* jeudi 22 août 2013 17:54 > *To:* Pascal Thubert (pthubert) > *Cc:* xvilajosana@eecs.berkeley.edu > ; Thomas Watteyne; > 6tsch@ietf.org > > > *Subject:* Re: [6tsch] time parent selection based on EB priority > > Hi Pascal, > > Is it assumed that 2 DODAG in a same instance must have at least > one shared node? > > Thanks > > Qin > > On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) > > wrote: > > Hello Xavi: > > The problem is that we have 2 mechanisms that establish a distance > to the root in order to avoid loops, RPL Rank and 4e priority. > > Fact is, RPL is probably more elaborate for loop detection and > loop avoidance. I suspect that the priority can easily count to > infinity. > > So I'd trust RPL Rank rather than priority, and we seem to agree > that we want to time sync with RPL parents. > > a) My question is whether it makes sense and value to have a > transition between a time source based on best (hop count) > priority and to one based on best RPL Rank, or if we could use the > rank right away. Seems to me that life would be easier if we use > the Rank right away, though it may make the network a bit slower > to come up. Passing from one mode to the other will demand some > specifications, what if one node reboots and goes from one mode to > the other, etc... > > Now if the question is to reuse the priority field, then we can do > actually change the logic to accommodate priority = DAGRank(Rank) > for nodes that are not root, still ensuring that only a node that > is already part of a RPL DAG may be used as time source. > > Initially only the root would be priority 0. All the others would > be default 255 (that is DAGRank(INFINITE_RANK) assuming > MinHopRankIncrease of 255) > > From there, all nodes that are one hop away from root with good > RSSI can sync with the root, and listen to DIOs, and emit their > own, and set their own priority to DAGRank(Rank) that is < 255. > > Children sync to whichever prio < 255 neighbor as time source, > listen to DIOs, select a parent, migrate to that parent as time > source, and then can set their own priority to zero and send DIOs. > If later they select a better parent the priority will get lower > so that's till OK. > > Would that fly? > > b) about multiple DAGs, there are 2 cases: > > - 2 DODAGs in a same instance. We said we want to support that, > and that implies that the various DODAGs are closely time sync'd. > > - 2 DODAGs in 2 different instances. To be discussed. We have use > cases where that could be useful, one instance playing basic > slotted aloha and the other doing more critical jobs. > > We have not agreed on the latter but with a single radio, it seems > problematic if the 2 instances do not share a same sense of time. > We'd end up with slot frames that may drift from one another, > sometimes overlapping... I suspect that we'd partition time inside > a slot frame or using multiple slot frames, but we'd keep them in > sync. Probably there is a need for a spanning instance (0) for > (autonomic) management etc... that uses something very simple, > always on, very much like your basic draft. If there is such a > spanning instance, then it can be used to sync everyone, in which > casethe Rank from the dependent instances is not used for time sync. > > What do others think? > > Pascal > > *From:*Xavier Vilajosana Guillen > [mailto:xvilajosana@eecs.berkeley.edu > ] > *Sent:* jeudi 22 août 2013 15:34 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] time parent selection based on EB priority > > Hi Pascal, > > my comment inline: > > [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to > RPL to do like an hop-count-based OF0. > > Q: Do we really need to build the time sync tree faster than the > RPL graph? > > If no, maybe me could use the priority as a boolean to mean that > the node is already part of the RPL DAG and may be used as time > source. > > Initially only the root would be priority 0. All the others would > be default 1. > > From there, all nodes that are one hop away from root with good > RSSI can sync with the root, and listen to DIOs, and emit their > own, and set their own priority to zero. > > Children sync to whichever prio 0 neighbor as time source, listen > to DIOs, select a parent, migrate to that parent as time source, > and then can set their own priority to zero and send DIOs. > > Would that fly? > > yes that would work but we are doing the same as the IEEE802-15.4e > Join priority field is for. The 15.4e defines this mechanism and > it is inherent to the networks we address so using it is > straightforward. Then as described by Thomas, we only need to use > RPL best parent as soon as we have one instead of the lowest prio > neighbor. > > Another question with time sources is the selection of a time > source parent in the case that a node belongs to more than one > DODAG. Which parent is selected then? An more importantly, do the > basic draft considers having more than one DODAG? > > thanks! > Xavi > > On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) > > wrote: > > Dear all: > > As you know, RPL may entail temporary loops, in particular if > DAGMaxRankIncrease is not configured to 0. > > If as we expect we use the RPL preferred parent tree for time > sync, this will lead to time sync loops. > > Two questions here: > > 1) how bad is the effect of such loop? I expect that the clocks > will derive rapidly, as if from the perspective of a node the > crystal was real, real bad. > > 2) can we detect that effect and use it to detect a loop in the > routing? > > Please see inline: > > sch] time parent selection based on EB priority > > Qin, Xavi, > > Excellent point. I believe that this is exactly what makes this > 6TSCH work so interesting: figuring out how consolidate the views > between upper and lower layers. > > In my mind, the join priority as you describe looks very much like > a DAGrank. I believe there are, however, two potential questions > we should not forget: > > - what if the joining mote does no get all of the EBs of its neighbor? > > - what happens when the topology changes and a node moves up or > down in the DODAG? > > I would suggest the following: > > - once the node has fully joined, somehow tie the join priority to > its RPL DAGrank. We might have to play with the metric to make the > join priority look like a hop count, but I believe it is important > the announced join priority changes when the mote moves up/down in > the topology. > > - maybe consider the time source parent identified during the > joining as temporary until the final time source parent is > discovered. How the final one is discovered can through some > command from the ME (see Qin's attachement), or after receiving > many DIOs. > > [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to > RPL to do like an hop-count-based OF0. > > Q: Do we really need to build the time sync tree faster than the > RPL graph? > > If no, maybe me could use the priority as a boolean to mean that > the node is already part of the RPL DAG and may be used as time > source. > > Initially only the root would be priority 0. All the others would > be default 1. > > From there, all nodes that are one hop away from root with good > RSSI can sync with the root, and listen to DIOs, and emit their > own, and set their own priority to zero. > > Children sync to whichever prio 0 neighbor as time source, listen > to DIOs, select a parent, migrate to that parent as time source, > and then can set their own priority to zero and send DIOs. > > Would that fly? > > Cheers, > > Pascal > > On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang > wrote: > > Agree! > > Qin > > On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen > > wrote: > > HI Qin, > > as a basic setting we want the most basic approach. I guess that > using (1) first priority and then RSSi will avoid having loops. As > you say all this approaches would work but I bet for (1) to be the > simplest. > > cheers! > X > > On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang > wrote: > > Hi Xavi, > > It is a good idea to use Priority in EB as a factor to choose > initial time parent. But, I think there are several ways to use > the Priority, and other metrics like RSSI. For example, > > (1) As you suggested, use Priority first, and then RSSI > > (2) or use RSSI first, and then Priority > > (3) or use a function of Priority and RSSI. > > I'm not sure which is better. What do you think? > > Qin > > On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen > > wrote: > > Hi all, > > I want to propose to add in the basic TSCH draft the fact that > when a node joins a network, it uses the EB join priority > defined in the Slot and Link IE (Section 5.2.4.13 15.4e std) > to select its time parent. This priority is 0 for the PAN > coordinator of the network. A node listening several EB > selects as a time parent the node with lowest EB Join > Priority. In case of receiving multiple EBs with the same Join > priority then filters by other metrics e.g RSSI of the link. > (note that until a DIO is received nodes don not know about > the gradient). > > A node when sends an EB uses the lowest EB Join priority it > has heard and adds 1 to it as its own Join priority. > > > Current draft section states that RSSI or another metric > should be used to select the initial time parent, this has the > problem that loops cannot be avoided until the first DIO is > received. With the proposed approach the problem is solved and > does not introduce anything new, just used what 15.4e provides > to us. > > what is your opinion? > > thanks! > Xavi > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch --------------060401070709020509040203 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit It is not unlikely that some motes in a network will have an accurate time source,
    such as GPS.  It would be a shame to ignore the time information from a 1-hop neighbor
    with GPS just because it happened to be a child in the DODAG.

    ksjp

    On 8/22/2013 4:10 PM, Thomas Watteyne wrote:
    All,

    Summarizing the different things we are talking about in this thread:
    1. picking time source neighbors during the operation of the network. Proposal is to use the (loop-free) RPL DAG. Challenged by Raghuram who wants to have separate L2 and L3 behavior because of race conditions.
    2. picking time source neighbors during join process. Proposal is to attach to the node which indicates the lowest join priority in EB. Question is whether join priority reflects DAGrank or not.
    3. multiple DODAGs: keeping DAGroots sync'ed or participating in several independent time bases.

    My opinion is:
    1. I believe keeping the same DAG structure the same between L2 and L3 makes sense. If there is no L2 connectivity, L3 cannot function since it can not speak to and hear the neighbors, so I'm afraid I don't quite follow the race condition issue.
    2. My inclination is to have the join priority be an indication of the DAGrank, possible by "rounding off". When joining, a new node will join L2 (i.e. synchronize) as soon as it hears EBs, then join L3 (i.e, acquire a DAGrank) after hearing DIOs. I would have the node transmit EBs only after that last step.
    3. My opinion is that, for now, we should take the multiple root case into account, but only if they are synchronized through some out-of-band mechanism.

    Raw opinions, up for discussion :)

    Thomas

    On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Dear Qin:

     

    I think the idea was to make sure that the roots are synchronized.

    Certainly the DODAGs may be a bit out of sync as we progress down, but we expect that the guard time is sufficient.

    The alternate would be to sync the whole network completely independent of RPL DAGs etc… eg using a GPS.

    There might be use cases where that is fine, but we need to document a default behavior that does not make the assumption of a GPS or similar.

     

    Makes sense?

     

    Cheers,

     

    Pascal

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 août 2013 19:03


    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

     

    Pascal,

     

    It may bring in some complexity. Think about the case. DODAG1 and DODAG2 are in a same instance, but have no shared nodes, thus may not be able sync with each other.  A new node (node-A) comes in, wants to join into the two DODAGs, in another word, want to jump between the two DODAGs.  I believe node-A has to change its time source parent and re-sync when it jump from one DODAG to another. Right?

     

    Thank

    Qin

     

     

     

     

    On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    I do not think so, Qin;

     

    but it is required that a node on one DODAG may jump onto the other, and to do that, it is useful to monitoring candidates from both dodags.

    Note that DODAGs partition the network, and all the parents must be in one of them.

     

    Cheers;

     

    Pascal

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 août 2013 17:54
    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] time parent selection based on EB priority

     

    Hi Pascal,

     

    Is it assumed that 2 DODAG in a same instance must have at least one shared node?

     

    Thanks

    Qin

     

    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    The problem is that we have 2 mechanisms that establish a distance to the root in order to avoid loops, RPL Rank and 4e priority.

    Fact is, RPL is probably more elaborate for loop detection and loop avoidance. I suspect that the priority can easily count to infinity.

    So I’d trust RPL Rank rather than priority, and we seem to agree that we want to time sync with RPL parents.

     

    a) My question is whether it makes sense and value to have a transition between a time source based on best (hop count) priority and to one based on best RPL Rank, or if we could use the rank right away. Seems to me that life would be easier if we use the Rank right away, though it may make the network a bit slower to come up. Passing from one mode to the other will demand some specifications, what if one node reboots and goes from one mode to the other, etc…

     

    Now if the question is to reuse the priority field, then we can do actually change the logic to accommodate priority = DAGRank(Rank) for nodes that are not root, still ensuring that only a node that is already part of a RPL DAG may be used as time source.

    Initially only the root would be priority 0. All the others would be default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255)

    From there, all nodes that are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to DAGRank(Rank) that is < 255.

    Children sync to whichever prio < 255 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero and send DIOs. If later they select a better parent the priority will get lower so that’s till OK.

    Would that fly?

    b) about multiple DAGs, there are 2 cases:

    - 2 DODAGs in a same instance. We said we want to support that, and that implies that the various DODAGs are closely time sync’d.

    - 2 DODAGs in 2 different instances. To be discussed. We have use cases where that could be useful, one instance playing basic slotted aloha and the other doing more critical jobs.

     

    We have not agreed on the latter but with a single radio, it seems problematic if the 2 instances do not share a same sense of time. We’d end up with slot frames that may drift from one another, sometimes overlapping… I suspect that we’d partition time inside a slot frame or using multiple slot frames, but we’d keep them in sync. Probably there is a need for a spanning instance (0) for (autonomic) management etc… that uses something very simple, always on, very much like your basic draft. If there is such a spanning instance, then it can be used to sync everyone, in which casethe Rank from the dependent instances is not used for time sync.

    What do others think?

     

    Pascal

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 août 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

     

    Hi Pascal,

     

    my comment inline:

     

    [Pascal] Yes, I read Xavi’s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priority 0. All the others would be default 1.

    From there, all nodes that are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero and send DIOs.

    Would that fly?

    yes that would work but we are doing the same as the IEEE802-15.4e Join priority field is for. The 15.4e defines this mechanism and it is inherent to the networks we address so using it is straightforward. Then as described by Thomas, we only need to use RPL best parent as soon as we have one instead of the lowest prio neighbor. 

    Another question with time sources is the selection of a time source parent in the case that a node belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic draft considers having more than one DODAG? 

    thanks!
    Xavi

     

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Dear all:

     

    As you know, RPL may entail temporary loops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use the RPL preferred parent tree for time sync, this will lead to time sync loops.

    Two questions here:

    1) how bad is the effect of such loop? I expect that the clocks  will derive rapidly, as if from the perspective of a node the crystal was real, real bad.

    2) can we detect that effect and use it to detect a loop in the routing?

     

    Please see inline:

     

    sch] time parent selection based on EB priority

     

    Qin, Xavi,

     

    Excellent point. I believe that this is exactly what makes this 6TSCH work so interesting: figuring out how consolidate the views between upper and lower layers.

     

    In my mind, the join priority as you describe looks very much like a DAGrank. I believe there are, however, two potential questions we should not forget:

    - what if the joining mote does no get all of the EBs of its neighbor?

    - what happens when the topology changes and a node moves up or down in the DODAG?

     

    I would suggest the following:

    - once the node has fully joined, somehow tie the join priority to its RPL DAGrank. We might have to play with the metric to make the join priority look like a hop count, but I believe it is important the announced join priority changes when the mote moves up/down in the topology.

    - maybe consider the time source parent identified during the joining as temporary until the final time source parent is discovered. How the final one is discovered can through some command from the ME (see Qin's attachement), or after receiving many DIOs.

     

    [Pascal] Yes, I read Xavi’s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priority 0. All the others would be default 1.

    From there, all nodes that are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero and send DIOs.

    Would that fly?

    Cheers,

    Pascal

     

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

     

    Qin

     

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) first priority and then RSSi will avoid having loops. As you say all this approaches would work but I bet for (1) to be the simplest.

    cheers!
    X

     

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

     

    It is a good idea to use Priority in EB as a factor to choose initial time parent. But, I think there are several ways to use the Priority, and other metrics like RSSI. For example,

     

    (1) As you suggested, use Priority first, and then RSSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

     

    I'm not sure which is better. What do you think?

     

    Qin

     

     

    On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu> wrote:

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node joins a network, it uses the EB join priority defined in the Slot and Link IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node with lowest EB Join Priority. In case of receiving multiple EBs with the same Join priority then filters by other metrics e.g RSSI of the link. (note that until a DIO is received nodes don not know about the gradient).

    A node when sends an EB uses the lowest EB Join priority it has heard and adds 1 to it as its own Join priority.


    Current draft section states that RSSI or another metric should be used to select the initial time parent, this has the problem that loops cannot be avoided until the first DIO is received. With the proposed approach the problem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

     

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    6tsch mailing list
    6tsch@ietf.org
    https://www.ietf.org/mailman/listinfo/6tsch

     

     

     


    _______________________________________________
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    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    https://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
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    https://www.ietf.org/mailman/listinfo/6tsch

     

     




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    --------------060401070709020509040203-- From ksjp@berkeley.edu Thu Aug 22 16:45:21 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 15DFC11E826A for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 16:45:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.799 X-Spam-Level: X-Spam-Status: No, score=-2.799 tagged_above=-999 required=5 tests=[AWL=0.801, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tjvVlnBGK1At for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 16:45:12 -0700 (PDT) Received: from mail-pa0-f50.google.com (mail-pa0-f50.google.com [209.85.220.50]) by ietfa.amsl.com (Postfix) with ESMTP id 739D111E8239 for <6tsch@ietf.org>; Thu, 22 Aug 2013 16:45:12 -0700 (PDT) Received: by mail-pa0-f50.google.com with SMTP id fb10so2781837pad.9 for <6tsch@ietf.org>; Thu, 22 Aug 2013 16:45:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :cc:subject:references:in-reply-to:content-type :content-transfer-encoding; bh=Uc+zLOkce+Der0GLbn1evWuteTdFbs+LTHrX6n9HxgY=; b=ciQOkYtPesBgFzEFvBWcm6YWgNLiVcjYIIhVLWg2PMIYJhCrgOzcVVgG2kiG656ZJg FvbaCK9xoNIzIozwGmWf9RV8aMkkvSyIRf9JVmZFTzw1XsG6au70AG4JhKSepYNV4RMO Mije92pp4X5M8AMPGr0wYoL834zJ1csazpGMEdn2wJEZf9WVXMf6kqr2trEnAICyFRUn c79HaKpqdtneC+MaFxuW1fESxtWyDFfz/2FA0vM7DLmaK3DTSzvgreAT5CS5/mrOVPrw RaA9oGwEFhhDsGdLOIFuIftW0F/0RVzQCeAB+JFFMPjS0w/nBSi7yo+DDhqbGczmpgCC bBmA== X-Gm-Message-State: ALoCoQnxDJXE61YHpYrNfsNr9FhMjVk19YCV5ItavbVk/qS8//oUKNqI+8vyvNDJ6crLlIK3IV9G X-Received: by 10.68.48.166 with SMTP id m6mr7888578pbn.105.1377215111981; Thu, 22 Aug 2013 16:45:11 -0700 (PDT) Received: from [128.32.32.89] (dhcp-32-89.EECS.Berkeley.EDU. [128.32.32.89]) by mx.google.com with ESMTPSA id tr10sm17429151pbc.22.1969.12.31.16.00.00 (version=SSLv3 cipher=RC4-SHA bits=128/128); Thu, 22 Aug 2013 16:45:11 -0700 (PDT) Message-ID: <5216A2A1.3080602@berkeley.edu> Date: Thu, 22 Aug 2013 16:45:37 -0700 From: Kris Pister User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: Alfredo Grieco References: <5215eb9f.e2c6b40a.6b2c.ffffe7e1@mx.google.com> In-Reply-To: <5215eb9f.e2c6b40a.6b2c.ffffe7e1@mx.google.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: '6TSCH' <6tsch@ietf.org>, 'Elvis Vogli' , 'Gennaro Boggia' , 'Giuseppe' Subject: Re: [6tsch] Synchronization Issues X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Aug 2013 23:45:21 -0000 Alfredo - having all of the powered nodes (not just the PAN coord/DODAG root) advertise more frequently is a good idea for a lot of reasons. They can afford it, and they are probably the nodes that will ultimately have the most children in a network with a power-aware routing metric. For relatively low duty cycle on the transmitter and receiver, and randomly chosen advertising slots, the average time needed for a mote to synchronize to a network is CT/(NPD) [1] C = # channels T = average time between EBs transmitted by neighbors N = number of neighbors P = packet delivery ratio (1-PER) D = duty cycle of the receiver On the other end of the scale, if the listener duty cycle is 100% and it listens for C superframes, then it will hear an advertisement from PN neighbors. If the EBs are only sent in a known cell, or even a known slot, then the first synchronization event has the same average time as above, but the speed of discovery of the rest of the network has more to do with Poisson statistics and node degree than the number of channels and the superframe length. ksjp [1] http://robotics.eecs.berkeley.edu/~pister/290Q/Papers/Pister%20TSMP%20DSN08.pdf On 8/22/2013 3:44 AM, Alfredo Grieco wrote: > Dear All, > > My research group is trying to test and develop fast bootstrapping > techniques for TSCH. > > In particular, we are focusing on synchronization issues. We would like to > share with you our thoughts to gain your comments. > > Assuming that the PAN coordinator starts sending EBs, its neighbors will > send EB too after they get synchronized (i.e., when they successfully > receive the EB sent by the coordinator). In this way, the synchronization is > propagated downwards to the leaves. Unfortunately, the neighbors of the > coordinator cannot know in advance the channel to listen (i.e., the channel > the PAN coordinator will use to transmit EBs) so that it may take some time > to establish the synchronization at one hop, and, as a consequence, till all > nodes are reached by an EB (since the same problem holds also for the > second, third hop and so on). The longer the bootstrap time the larger the > amount of energy spent in for listening EBs. > > How to shorten this bootstrap time ? > > If we look at the pan coordinator, assuming it is powered by the mains, it > could send more than one EB per superframe in order to swipe faster all > available channels. > > Looking at the rest of the nodes that already received an EB, we could try > to let them transmit an EB on average once every Multisuperframe in such a > way that all channels are used in a reasonably short time. In this way, a > new joining node could quickly receive an EB whatever the channel it is > listening to. > > Any comment is welcome. > > Thanks in advance > > Alfredo > > > -- > Luigi Alfredo Grieco, Ph. D. > Assistant Professor in Telecommunications > DEE - Politecnico di Bari > Via Orabona, 4 - 70125 - Bari - Italy > Phone: +39 080 5963 911 > Fax: +39 080 5963 410 > telematics.poliba.it/grieco > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch From ribes170289@gmail.com Thu Aug 22 17:51:30 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 50D2D11E8289 for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 17:51:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id z83RkNzXzX7w for <6tsch@ietfa.amsl.com>; Thu, 22 Aug 2013 17:51:28 -0700 (PDT) Received: from mail-ea0-x229.google.com (mail-ea0-x229.google.com [IPv6:2a00:1450:4013:c01::229]) by ietfa.amsl.com (Postfix) with ESMTP id 08B0511E8182 for <6tsch@ietf.org>; Thu, 22 Aug 2013 17:51:27 -0700 (PDT) Received: by mail-ea0-f169.google.com with SMTP id k11so1208401eaj.28 for <6tsch@ietf.org>; Thu, 22 Aug 2013 17:51:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; bh=XHOmBCOJtKxLU6MSF+LH5H7xOnfoPN8m5M/qYLy4f8g=; b=J0XMbXNIU7FUsL+CsOl7wmfmUjfSUx26h1xH37bvqqNn1Z9v2fenmUScegIQYKjx50 0L5mHJ/iFZh+kLNhE0hAqw2Voye6vETovYv98nIHSwC028EE/aHGv72Mvgizb/2Srn9v Rk1TU28U5qFXWn+e80X0h+myk9J/jfbOI0OmOtCSaG/uK/Lbr+mNEtKLdMmhTMfhI6dO /usiU7vgV+m1fQrXawFeF8Wn3xl/xR2lmyjvVHRjCjCsRQXv9Rz+yejbA08rv2l+kr9Z cinUhTCffSkvzFpf0Map1EBjO+xBDnhe6I1NcJEJygAZQESxKG6+IlYc7hYRv8llif85 vqEg== X-Received: by 10.14.4.1 with SMTP id 1mr22368755eei.21.1377219074390; Thu, 22 Aug 2013 17:51:14 -0700 (PDT) Received: from ribeshost.ribesdomain (adsl-ull-90-81.47-151.net24.it. [151.47.81.90]) by mx.google.com with ESMTPSA id a43sm21143238eep.9.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 22 Aug 2013 17:51:13 -0700 (PDT) Message-ID: <5216B1F4.8090504@gmail.com> Date: Fri, 23 Aug 2013 02:51:00 +0200 From: Giuseppe User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8 MIME-Version: 1.0 To: Kris Pister References: <5215eb9f.e2c6b40a.6b2c.ffffe7e1@mx.google.com> <5216A2A1.3080602@berkeley.edu> In-Reply-To: <5216A2A1.3080602@berkeley.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: '6TSCH' <6tsch@ietf.org>, Alfredo Grieco , 'Elvis Vogli' , 'Gennaro Boggia' Subject: Re: [6tsch] Synchronization Issues X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 00:51:30 -0000 Il 23/08/2013 01:45, Kris Pister ha scritto: > Alfredo - > having all of the powered nodes (not just the PAN coord/DODAG root) > advertise more frequently is a good idea for a lot of reasons. > They can afford it, and they are probably the nodes that will > ultimately have the most > children in a network with a power-aware routing metric. > > For relatively low duty cycle on the transmitter and receiver, and > randomly chosen > advertising slots, the average time needed for a mote to synchronize to a > network is CT/(NPD) [1] > > C = # channels > T = average time between EBs transmitted by neighbors > N = number of neighbors > P = packet delivery ratio (1-PER) > D = duty cycle of the receiver > > On the other end of the scale, if the listener duty cycle is 100% and > it listens for C > superframes, then it will hear an advertisement from PN neighbors. > > If the EBs are only sent in a known cell, or even a known slot, then > the first > synchronization event has the same average time as above, but the > speed of > discovery of the rest of the network has more to do with Poisson > statistics > and node degree than the number of channels and the superframe length. > > ksjp > > [1] > http://robotics.eecs.berkeley.edu/~pister/290Q/Papers/Pister%20TSMP%20DSN08.pdf > > > > On 8/22/2013 3:44 AM, Alfredo Grieco wrote: >> Dear All, >> >> My research group is trying to test and develop fast bootstrapping >> techniques for TSCH. >> >> In particular, we are focusing on synchronization issues. We would >> like to >> share with you our thoughts to gain your comments. >> >> Assuming that the PAN coordinator starts sending EBs, its neighbors will >> send EB too after they get synchronized (i.e., when they successfully >> receive the EB sent by the coordinator). In this way, the >> synchronization is >> propagated downwards to the leaves. Unfortunately, the neighbors of the >> coordinator cannot know in advance the channel to listen (i.e., the >> channel >> the PAN coordinator will use to transmit EBs) so that it may take >> some time >> to establish the synchronization at one hop, and, as a consequence, >> till all >> nodes are reached by an EB (since the same problem holds also for the >> second, third hop and so on). The longer the bootstrap time the >> larger the >> amount of energy spent in for listening EBs. >> >> How to shorten this bootstrap time ? >> >> If we look at the pan coordinator, assuming it is powered by the >> mains, it >> could send more than one EB per superframe in order to swipe faster all >> available channels. >> >> Looking at the rest of the nodes that already received an EB, we >> could try >> to let them transmit an EB on average once every Multisuperframe in >> such a >> way that all channels are used in a reasonably short time. In this >> way, a >> new joining node could quickly receive an EB whatever the channel it is >> listening to. >> >> Any comment is welcome. >> >> Thanks in advance >> >> Alfredo >> >> >> -- >> Luigi Alfredo Grieco, Ph. D. >> Assistant Professor in Telecommunications >> DEE - Politecnico di Bari >> Via Orabona, 4 - 70125 - Bari - Italy >> Phone: +39 080 5963 911 >> Fax: +39 080 5963 410 >> telematics.poliba.it/grieco >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch > Hi, I agree, in my opinion while for the first time of bootstrap of the network, only the synchronizer can advertise the network, as soon as the first nodes reach synchronization and start to advertise the network, the sych time average could be decreased by sending the EB in the same frameslot but scheduling the transmission on different channels. This could increase also the degree of the network because asynchronous advertisement could lead to several beacon collisions in networks with an high density of nodes, while scheduling beacons with the couple (superframe_num, channel_num) should avoid the collisions in this case and improve the synchronization phase, letting a certain freedom on the superframe and on the multisuperframe length. I hope I was clear enough. -- Giuseppe From maria-rita.palattella@uni.lu Fri Aug 23 02:11:16 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 965B711E82E6 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 02:11:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.998 X-Spam-Level: X-Spam-Status: No, score=-5.998 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_42=0.6, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id K29Xcc3c7H3M for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 02:11:08 -0700 (PDT) Received: from hercules.uni.lu (hercules.uni.lu [158.64.76.33]) by ietfa.amsl.com (Postfix) with ESMTP id C9E7011E82D2 for <6tsch@ietf.org>; Fri, 23 Aug 2013 02:11:04 -0700 (PDT) X-IronPort-AV: E=Sophos;i="4.89,940,1367964000"; d="scan'208,217";a="26039383" Received: from unknown (HELO REED.uni.lux) ([10.21.2.9]) by hercules.uni.lu with ESMTP; 23 Aug 2013 11:11:02 +0200 Received: from HOSHI.uni.lux ([fe80::499:a33:4e68:4af9]) by REED.uni.lux ([fe80::31bb:b7a3:7abb:813e%10]) with mapi id 14.03.0123.003; Fri, 23 Aug 2013 11:11:02 +0200 From: Maria Rita PALATTELLA To: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: [6tsch] time parent selection based on EB priority Thread-Index: AQHOnp85pvBzQs80M0WsMAVsaMeQQpmf6DAAgAAAwQCAAA6JgIAApTWAgABBHwCAADvsAIAAG1MAgAALtICAAAY4gIAADUIAgAAgpICAAEYEgIAAxsig Date: Fri, 23 Aug 2013 09:11:02 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.91.0.73] Content-Type: multipart/alternative; boundary="_000_F085911F642A6847987ADA23E611780D1858E012hoshiunilux_" MIME-Version: 1.0 Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 09:11:16 -0000 --_000_F085911F642A6847987ADA23E611780D1858E012hoshiunilux_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thomas, see my comments inline. Maria Rita From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Friday, August 23, 2013 1:11 AM To: 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority All, Summarizing the different things we are talking about in this thread: 1. picking time source neighbors during the operation of the network. Propo= sal is to use the (loop-free) RPL DAG. Challenged by Raghuram who wants to = have separate L2 and L3 behavior because of race conditions. 2. picking time source neighbors during join process. Proposal is to attach= to the node which indicates the lowest join priority in EB. Question is wh= ether join priority reflects DAGrank or not. 3. multiple DODAGs: keeping DAGroots sync'ed or participating in several in= dependent time bases. My opinion is: 1. I believe keeping the same DAG structure the same between L2 and L3 make= s sense. If there is no L2 connectivity, L3 cannot function since it can no= t speak to and hear the neighbors, so I'm afraid I don't quite follow the r= ace condition issue. 2. My inclination is to have the join priority be an indication of the DAGr= ank, possible by "rounding off". When joining, a new node will join L2 (i.e= . synchronize) as soon as it hears EBs, then join L3 (i.e, acquire a DAGran= k) after hearing DIOs. I would have the node transmit EBs only after that l= ast step. [MR] I agree. If we want to use RPL topology information, and RPL parents a= s selected synch parents, it makes sense to link the join priority with th= e DAGrank. 3. My opinion is that, for now, we should take the multiple root case into = account, but only if they are synchronized through some out-of-band mechani= sm. [MR] I am afraid that multiple DODAGs may imply more complexity, and we are= looking for the basic simplest scenario. Thus, as you pointed out, if we w= ant to consider multiple roots, we will have to assume, at least for now, t= hat they are synchronized. Raw opinions, up for discussion :) Thomas On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) > wrote: Dear Qin: I think the idea was to make sure that the roots are synchronized. Certainly the DODAGs may be a bit out of sync as we progress down, but we e= xpect that the guard time is sufficient. The alternate would be to sync the whole network completely independent of = RPL DAGs etc... eg using a GPS. There might be use cases where that is fine, but we need to document a defa= ult behavior that does not make the assumption of a GPS or similar. Makes sense? Cheers, Pascal From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: jeudi 22 ao=FBt 2013 19:03 To: Pascal Thubert (pthubert) Cc: xvilajosana@eecs.berkeley.edu; Th= omas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Pascal, It may bring in some complexity. Think about the case. DODAG1 and DODAG2 ar= e in a same instance, but have no shared nodes, thus may not be able sync w= ith each other. A new node (node-A) comes in, wants to join into the two D= ODAGs, in another word, want to jump between the two DODAGs. I believe nod= e-A has to change its time source parent and re-sync when it jump from one = DODAG to another. Right? Thank Qin On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) > wrote: I do not think so, Qin; but it is required that a node on one DODAG may jump onto the other, and to= do that, it is useful to monitoring candidates from both dodags. Note that DODAGs partition the network, and all the parents must be in one = of them. Cheers; Pascal From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: jeudi 22 ao=FBt 2013 17:54 To: Pascal Thubert (pthubert) Cc: xvilajosana@eecs.berkeley.edu; Th= omas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi Pascal, Is it assumed that 2 DODAG in a same instance must have at least one shared= node? Thanks Qin On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) > wrote: Hello Xavi: The problem is that we have 2 mechanisms that establish a distance to the r= oot in order to avoid loops, RPL Rank and 4e priority. Fact is, RPL is probably more elaborate for loop detection and loop avoidan= ce. I suspect that the priority can easily count to infinity. So I'd trust RPL Rank rather than priority, and we seem to agree that we wa= nt to time sync with RPL parents. a) My question is whether it makes sense and value to have a transition bet= ween a time source based on best (hop count) priority and to one based on b= est RPL Rank, or if we could use the rank right away. Seems to me that life= would be easier if we use the Rank right away, though it may make the netw= ork a bit slower to come up. Passing from one mode to the other will demand= some specifications, what if one node reboots and goes from one mode to th= e other, etc... Now if the question is to reuse the priority field, then we can do actually= change the logic to accommodate priority =3D DAGRank(Rank) for nodes that = are not root, still ensuring that only a node that is already part of a RPL= DAG may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255) >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to DAGRank(Rank) that is < 255. Children sync to whichever prio < 255 neighbor as time source, listen to DI= Os, select a parent, migrate to that parent as time source, and then can se= t their own priority to zero and send DIOs. If later they select a better p= arent the priority will get lower so that's till OK. Would that fly? b) about multiple DAGs, there are 2 cases: - 2 DODAGs in a same instance. We said we want to support that, and that im= plies that the various DODAGs are closely time sync'd. - 2 DODAGs in 2 different instances. To be discussed. We have use cases whe= re that could be useful, one instance playing basic slotted aloha and the o= ther doing more critical jobs. We have not agreed on the latter but with a single radio, it seems problema= tic if the 2 instances do not share a same sense of time. We'd end up with = slot frames that may drift from one another, sometimes overlapping... I sus= pect that we'd partition time inside a slot frame or using multiple slot fr= ames, but we'd keep them in sync. Probably there is a need for a spanning i= nstance (0) for (autonomic) management etc... that uses something very simp= le, always on, very much like your basic draft. If there is such a spanning= instance, then it can be used to sync everyone, in which casethe Rank from= the dependent instances is not used for time sync. What do others think? Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: jeudi 22 ao=FBt 2013 15:34 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi Pascal, my comment inline: [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? yes that would work but we are doing the same as the IEEE802-15.4e Join pri= ority field is for. The 15.4e defines this mechanism and it is inherent to = the networks we address so using it is straightforward. Then as described b= y Thomas, we only need to use RPL best parent as soon as we have one instea= d of the lowest prio neighbor. Another question with time sources is the selection of a time source parent= in the case that a node belongs to more than one DODAG. Which parent is se= lected then? An more importantly, do the basic draft considers having more = than one DODAG? thanks! Xavi On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) > wrote: Dear all: As you know, RPL may entail temporary loops, in particular if DAGMaxRankInc= rease is not configured to 0. If as we expect we use the RPL preferred parent tree for time sync, this wi= ll lead to time sync loops. Two questions here: 1) how bad is the effect of such loop? I expect that the clocks will deriv= e rapidly, as if from the perspective of a node the crystal was real, real = bad. 2) can we detect that effect and use it to detect a loop in the routing? Please see inline: sch] time parent selection based on EB priority Qin, Xavi, Excellent point. I believe that this is exactly what makes this 6TSCH work = so interesting: figuring out how consolidate the views between upper and lo= wer layers. In my mind, the join priority as you describe looks very much like a DAGran= k. I believe there are, however, two potential questions we should not forg= et: - what if the joining mote does no get all of the EBs of its neighbor? - what happens when the topology changes and a node moves up or down in the= DODAG? I would suggest the following: - once the node has fully joined, somehow tie the join priority to its RPL = DAGrank. We might have to play with the metric to make the join priority lo= ok like a hop count, but I believe it is important the announced join prior= ity changes when the mote moves up/down in the topology. - maybe consider the time source parent identified during the joining as te= mporary until the final time source parent is discovered. How the final one= is discovered can through some command from the ME (see Qin's attachement)= , or after receiving many DIOs. [Pascal] Yes, I read Xavi's proposal as a mechanism parallel to RPL to do l= ike an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? Cheers, Pascal On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang > wrote: Agree! Qin On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen > wrote: HI Qin, as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest. cheers! X On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang > wrote: Hi Xavi, It is a good idea to use Priority in EB as a factor to choose initial time = parent. But, I think there are several ways to use the Priority, and other = metrics like RSSI. For example, (1) As you suggested, use Priority first, and then RSSI (2) or use RSSI first, and then Priority (3) or use a function of Priority and RSSI. I'm not sure which is better. What do you think? Qin On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen > wrote: Hi all, I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB sele= cts as a time parent the node with lowest EB Join Priority. In case of rece= iving multiple EBs with the same Join priority then filters by other metric= s e.g RSSI of the link. (note that until a DIO is received nodes don not kn= ow about the gradient). A node when sends an EB uses the lowest EB Join priority it has heard and a= dds 1 to it as its own Join priority. Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e pro= vides to us. what is your opinion? thanks! Xavi _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_F085911F642A6847987ADA23E611780D1858E012hoshiunilux_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Thomas, see my comments i= nline.

    Maria Rita

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Friday, August 23, 2013 1:11 AM
    To: 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority=

     

    All,

     

    Summarizing the different things we are talking abou= t in this thread:

    1. picking time source neighbors during the operatio= n of the network. Proposal is to use the (loop-free) RPL DAG. Challenged by= Raghuram who wants to have separate L2 and L3 behavior because of race con= ditions.

    2. picking time source neighbors during join process= . Proposal is to attach to the node which indicates the lowest join priorit= y in EB. Question is whether join priority reflects DAGrank or not.

    3. multiple DODAGs: keeping DAGroots sync'ed or part= icipating in several independent time bases.

     

    My opinion is:

     <= /p>

    1. I believe keeping the same DAG structure the same= between L2 and L3 makes sense. If there is no L2 connectivity, L3 cannot f= unction since it can not speak to and hear the neighbors, so I'm afraid I d= on't quite follow the race condition issue.

     

     <= /p>

    2. My inclination is to have the join priority be an= indication of the DAGrank, possible by "rounding off". When join= ing, a new node will join L2 (i.e. synchronize) as soon as it hears EBs, th= en join L3 (i.e, acquire a DAGrank) after hearing DIOs. I would have the node transmit EBs only after that last step.

     <= /p>

    [MR] I agree. If we want = to use RPL topology information, and RPL parents as selected synch parents,=  it makes sense to link the join priority with the DAGrank.

     <= /p>

    3. My opinion is that, for now, we should take the m= ultiple root case into account, but only if they are synchronized through s= ome out-of-band mechanism.

     <= /p>

    [MR] I am afraid that mul= tiple DODAGs may imply more complexity, and we are looking for the basic si= mplest scenario. Thus, as you pointed out, if we want to consider multiple roots, we will have to assume, at least for now, that th= ey are synchronized.

     

    Raw opinions, up for discussion :)

     

    Thomas

     

    On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Dear Qin:

     

    I think the idea was to make sure that = the roots are synchronized.

    Certainly the DODAGs may be a bit out o= f sync as we progress down, but we expect that the guard time is sufficient.

    The alternate would be to sync the whol= e network completely independent of RPL DAGs etc… eg using a GPS.

    There might be use cases where that is = fine, but we need to document a default behavior that does not make the assumption of a GPS or similar.

     

    Makes sense?

     

    Cheers,

     

    Pascal

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 19:03


    To: Pascal Thubert (pthubert)
    Cc:     xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority=

     

    Pascal,

     

    It may bring in some complexity. Think about the case. DODAG1 and = DODAG2 are in a same instance, but have no shared nodes, thus may not be ab= le sync with each other.  A new node (node-A) comes in, wants to join into the two DODAGs, in another word, wan= t to jump between the two DODAGs.  I believe node-A has to change its = time source parent and re-sync when it jump from one DODAG to another. Righ= t?

     

    Thank

    Qin

     

     

     

     

    On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    I do not think so, Qin;

     

    but it is required that a node on one D= ODAG may jump onto the other, and to do that, it is useful to monitoring candidates from both dodags.

    Note that DODAGs partition the network,= and all the parents must be in one of them.

     

    Cheers;

     

    Pascal

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 17:54
    To: Pascal Thubert (pthubert)
    Cc:     xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] time parent selection based on EB priority=

     

    Hi Pascal,

     

    Is it assumed that 2 DODAG in a same instance must have at least o= ne shared node?

     

    Thanks

    Qin

     

    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    The problem is that we have 2 mechanism= s that establish a distance to the root in order to avoid loops, RPL Rank and 4e priority.

    Fact is, RPL is probably more elaborate= for loop detection and loop avoidance. I suspect that the priority can easily count to infinity.

    So I’d trust RPL Rank rather than= priority, and we seem to agree that we want to time sync with RPL parents.

     

    a) My question is whether it makes sens= e and value to have a transition between a time source based on best (hop count) priority and to one based on best RPL Rank, or if we c= ould use the rank right away. Seems to me that life would be easier if we u= se the Rank right away, though it may make the network a bit slower to come= up. Passing from one mode to the other will demand some specifications, what if one node reboots and goes f= rom one mode to the other, etc…

     

    Now if the question is to reuse the pri= ority field, then we can do actually change the logic to accommodate priority =3D DAGRank(Rank) for nodes that are not root, still ensuring tha= t only a node that is already part of a RPL DAG may be used as time source.=

    Initially only the root would be priori= ty 0. All the others would be default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255)

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to DAGRank(= Rank) that is < 255.

    Children sync to whichever prio < 25= 5 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs. If later they select a better parent the priority will get = lower so that’s till OK.

    Would that fly?

    b) about multiple DAGs, there are 2 cas= es:

    - 2 DODAGs in a same instance. We said = we want to support that, and that implies that the various DODAGs are closely time sync’d.

    - 2 DODAGs in 2 different instances. To= be discussed. We have use cases where that could be useful, one instance playing basic slotted aloha and the other doing more critical= jobs.

     

    We have not agreed on the latter but wi= th a single radio, it seems problematic if the 2 instances do not share a same sense of time. We’d end up with slot frames that= may drift from one another, sometimes overlapping… I suspect that we= ’d partition time inside a slot frame or using multiple slot frames, = but we’d keep them in sync. Probably there is a need for a spanning instance (0) for (autonomic) management etc… that use= s something very simple, always on, very much like your basic draft. If the= re is such a spanning instance, then it can be used to sync everyone, in wh= ich casethe Rank from the dependent instances is not used for time sync.

    What do others think?=

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

     

    Hi Pascal,

     

    my comment inline:

     

    [Pascal] Yes, I read Xavi’s propo= sal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time = sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority = as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 1.

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neigh= bor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    y= es that would work but we are doing the same as the IEEE802-15.4e Join prio= rity field is for. The 15.4e defines this mechanism and it is inherent to the networks we address so using it is straightforward. The= n as described by Thomas, we only need to use RPL best parent as soon as we= have one instead of the lowest prio neighbor. 

    A= nother question with time sources is the selection of a time source parent = in the case that a node belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic draft considers= having more than one DODAG? 

    t= hanks!
    Xavi

     

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) <pthubert@cisco.com= > wrote:

    Dear all:

     

    As you know, RPL may entail temporary l= oops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use the RPL preferre= d parent tree for time sync, this will lead to time sync loops.

    Two questions here:

    1) how bad is the effect of such loop? = I expect that the clocks  will derive rapidly, as if from the perspective of a node the crystal was real, real bad.

    2) can we detect that effect and use it= to detect a loop in the routing?

     

    Please see inline:

     

    sch] time parent selection based on EB priority=

     

    Qin, Xavi,

     

    Excellent point. I believe that this is exactly what makes this 6T= SCH work so interesting: figuring out how consolidate the views between upp= er and lower layers.

     

    In my mind, the join priority as you describe looks very much like= a DAGrank. I believe there are, however, two potential questions we should= not forget:

    - what if the joining mote does no get all of the EBs of its neigh= bor?

    - what happens when the topology changes and a node moves up or do= wn in the DODAG?

     

    I would suggest the following:

    - once the node has fully joined, somehow tie the join priority to= its RPL DAGrank. We might have to play with the metric to make the join pr= iority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified during the join= ing as temporary until the final time source parent is discovered. How the = final one is discovered can through some command from the ME (see Qin's attachement), or after receiving many = DIOs.

     

    [Pascal] Yes, I read Xavi’s propo= sal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time = sync tree faster than the RPL graph?

     

    If no, maybe me could use the priority = as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root would be priori= ty 0. All the others would be default 1.

    From there, all nodes that are one hop = away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 neigh= bor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

     

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

     

    Qin

     

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

     

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:<= o:p>

    Hi Xavi,

     

    It is a good idea to use Priority in EB as a factor to choose init= ial time parent. But, I think there are several ways to use the Priority, a= nd other metrics like RSSI. For example,

     

    (1) As you suggested, use Priority first, and then RSSI=

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

     

    I'm not sure which is better. What do you think?

     

    Qin

     

     

    On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an EB uses the lowest EB Join priority it has heard an= d adds 1 to it as its own Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

     

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     

    --_000_F085911F642A6847987ADA23E611780D1858E012hoshiunilux_-- From qinwang@berkeley.edu Fri Aug 23 06:10:40 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CA80211E82F1 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 06:10:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.362 X-Spam-Level: X-Spam-Status: No, score=-2.362 tagged_above=-999 required=5 tests=[AWL=-0.586, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_33=0.6, J_CHICKENPOX_44=0.6, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TdnRu1icbqhx for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 06:10:36 -0700 (PDT) Received: from mail-ve0-f170.google.com (mail-ve0-f170.google.com [209.85.128.170]) by ietfa.amsl.com (Postfix) with ESMTP id 95E9811E81B7 for <6tsch@ietf.org>; Fri, 23 Aug 2013 06:10:23 -0700 (PDT) Received: by mail-ve0-f170.google.com with SMTP id 15so417402vea.15 for <6tsch@ietf.org>; Fri, 23 Aug 2013 06:10:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=9UbDPiYz7gjjEZQQimbWwlV5VnKUP+++86p0zdUYLc0=; b=gHJowwpvEiA4JnZKpUnS0s8OXGWB4KtZEhCnvyjeFblQBS+NAxcY9HEcJ7PRyoSEg1 O9MCcQjwJmBkUWhxYw5yXsG2bxtu8H4GGbGIvr7SEWpVM6mmzwhX+AOs9jlRxg3eU6LX 72D5sO90Sxc3hCXwHvEIk4yVT6/bCqaK42uL2DnQu5p34JmUKGVkO2iU4mKb4y6kVW3F Rs5InErxK9+PzWoYHYNnxFmQxYaPsVmsoic7YbhREGZeBW9+V8l3gp60yzIMaSwSqaXV pAAuWldCHGrjBtzszt2LMTBR8ZPWcMZizazLoyl2NkRSNjGNlWS/DpZlfuJ7AdfIzsZK EaQA== X-Gm-Message-State: ALoCoQnHucBMypvPBMpJffbEvWZNIB8U5Bk/LvDZFsKcN5ire9tGq4zdZOIH6wtiBuB2Gpn9uJ+F MIME-Version: 1.0 X-Received: by 10.58.73.202 with SMTP id n10mr16722350vev.7.1377263421885; Fri, 23 Aug 2013 06:10:21 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Fri, 23 Aug 2013 06:10:21 -0700 (PDT) In-Reply-To: References: Date: Fri, 23 Aug 2013 21:10:21 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7bacbb5c06559304e49d21ca Cc: "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 13:10:40 -0000 --047d7bacbb5c06559304e49d21ca Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Thomas, We can separate centralized case and distributed case to think about it. (1) centralized case: PCE will configure the report/alarm criteria and provision tracks used for the node to send message to the ME in PCE in advance, so, the ME in PCE should be well prepared when the node is sending the 10pkts/s. (2) distributed case: the ME is in the upper layer of the same node, so event-driven mechanism can be used. Make sense? Qin On Fri, Aug 23, 2013 at 7:19 AM, Thomas Watteyne wrote: > Qin, > > I wasn't clear, sorry! What I mean is, if I'm a node in the network and > suddently I feel like sending 10 pkts/s to a different node, how do I let > the ME know to it can provision the slots? > > Thomas > > > On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote: > >> Perfect sync : )**** >> >> ** ** >> >> The questions top down are which device talks to which devices and to >> express what.**** >> >> Now it=92s good to have an idea of the formalism we expect to be using t= o >> make sure that it fits as we refine our work.**** >> >> Carsten will participate to the call tomorrow to present CBOR.**** >> >> ** ** >> >> Cheers,**** >> >> ** ** >> >> Pascal**** >> >> ** ** >> >> *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On >> Behalf Of *Xavier Vilajosana Guillen >> *Sent:* mardi 20 ao=FBt 2013 15:29 >> *To:* Thomas Watteyne >> *Cc:* 6tsch@ietf.org >> *Subject:* Re: [6tsch] data structure and format for management packets*= * >> ** >> >> ** ** >> >> Hi, one cent more to what Thomas says.**** >> >> ** ** >> >> IMHO, the most important thing is the content and secondary is the >> representation, at least at that time. So my feeling is that we need fir= st >> to identify the content, and later express it json,bson or any other >> compressed format.**** >> >> ** ** >> >> One possible way to think on that is go in a two way approach, bottom up >> and top down, i.e someone needs to describe what the PCE,etc .. need, >> another can take the 6top commands and go up from there. From this two >> specifications we will be able to identify what is missing and how to ma= tch >> things. **** >> >> ** ** >> >> just thoughts.**** >> >> X**** >> >> ** ** >> >> On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne < >> watteyne@eecs.berkeley.edu> wrote:**** >> >> Qin,**** >> >> ** ** >> >> Thanks for starting the thread! I have comment which my sound a bit >> vague, but it's on purpose :)**** >> >> ** ** >> >> Do you envision that the flows will match the 6tos commands exactly? Tha= t >> is, are you considering that the packets sent between different devices = in >> the network (PCE, motes, etc) contain the same commands as the 6top set = of >> commands from >> http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4?**** >> >> ** ** >> >> Maybe we could by identifying the flows that we are considering, then th= e >> contents of those packets (possibly described using some high level >> representation such as JSON), and only then worry about their efficient >> representation (e.g. BSON). Just a thought.**** >> >> ** ** >> >> Thomas**** >> >> ** ** >> >> On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote:*= * >> ** >> >> Hi Kris,**** >> >> ** ** >> >> You are right. Security Key should be a structured data, besides the key >> material, it should includes something like lifetime, KeyID, .....Correc= t? >> **** >> >> ** ** >> >> Many thanks!**** >> >> ** ** >> >> Qin**** >> >> ** ** >> >> On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote:*= * >> ** >> >> is the security key a string? That doesn't seem right. >> >> ksjp**** >> >> ** ** >> >> On 8/19/2013 2:05 PM, Qin Wang wrote:**** >> >> Hi all, **** >> >> ** ** >> >> I separate a thread from thread "Message Flows", to discuss the format >> for management messages, e.g. JSON, BSON, or others.**** >> >> ** ** >> >> As Thomas's suggestion, before delving into the representation of the >> information, we firstly identify what the contents of the different >> signaling packets are, and in addition, what the data structures they ma= y >> use. **** >> >> ** ** >> >> I would like to take the commands defined in draft-wang-6tsch-6top-00 as >> starting point. Here are the parameters in those commands.**** >> >> ** ** >> >> //integer**** >> >> (1) xxxID, e.g. TrackID, SlotframeID**** >> >> (2) xxxOffset, e.g. SlotOffset**** >> >> (3) NumOfxxx/Length**** >> >> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority **** >> >> (5) Status**** >> >> (6) ASN (5Byte integer), e.g. last time when a packet received from a >> neighbor**** >> >> ** ** >> >> //string**** >> >> (7) L2 address**** >> >> (8) SecurityKey**** >> >> ** ** >> >> //bitmap**** >> >> (9) LinkOption**** >> >> ** ** >> >> //floating**** >> >> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics*= * >> ** >> >> ** ** >> >> Maybe something else........**** >> >> ** ** >> >> Now, we can evaluate different representation methods. What do you think= ? >> **** >> >> ** ** >> >> Thanks**** >> >> Qin**** >> >> ** ** >> >> ** ** >> >> **** >> >> ** ** >> >> _______________________________________________**** >> >> 6tsch mailing list**** >> >> 6tsch@ietf.org**** >> >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> ** ** >> >> ** ** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> ** ** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> ** ** >> > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7bacbb5c06559304e49d21ca Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Thomas,

    We can separate centralized cas= e and distributed case to think about it.

    (1) cent= ralized case: PCE will configure the report/alarm criteria and provision tr= acks used for the node to send message to the ME in PCE in advance, so, the= ME in PCE should be well prepared when the node is sending the 10pkts/s.= =A0

    (2) distributed case: the ME is in the upper layer of t= he same node, so event-driven mechanism can be used.

    Make sense?

    Qin



    On Fri, Aug 23, 2013 at 7:19 AM, Thomas = Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    I wasn't clear, sorry! What I = mean is, if I'm a node in the network and suddently I feel like sending= 10 pkts/s to a different node, how do I let the ME know to it can provisio= n the slots?

    Thomas
    <= div class=3D"h5">


    On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) <pthube= rt@cisco.com> wrote:

    Perfect sync : )

    =A0<= /p>

    The questions top down ar= e which device talks to which devices and to express what.

    Now it=92s good to have a= n idea of the formalism we expect to be using to make sure that it fits as = we refine our work.

    Carsten will participate = to the call tomorrow to present CBOR.

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: mardi 20 ao=FBt 2013 15:29
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] data structure and format for management packet= s

    =A0

    Hi, one cent more to what Thomas says.=

    =A0

    IMHO, the most important thing is the content and se= condary is the representation, at least at that time. So my feeling is that= we need first to identify the content, and later express it json,bson or a= ny other compressed format.

    =A0

    One possible way to think on that is go in a two way= approach, bottom up and top down, i.e someone needs to describe what the P= CE,etc .. need, another can take the 6top commands and go up from there. Fr= om this two specifications we will be able to identify what is missing and how to match things.=A0<= /u>

    =A0

    just thoughts.

    X

    =A0

    On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne &l= t;watteyne@= eecs.berkeley.edu> wrote:

    Qin,

    =A0

    Thanks for starting the thread! I have comment which= my sound a bit vague, but it's on purpose :)

    =A0

    Do you envision that the flows will match the 6tos c= ommands exactly? That is, are you considering that the packets sent between= different devices in the network (PCE, motes, etc) contain the same comman= ds as the 6top set of commands from=A0http://tools.ietf.= org/html/draft-wang-6tsch-6top-00#section-2.4?

    =A0

    Maybe we could by identifying the flows that we are = considering, then the contents of those packets (possibly described using s= ome high level representation such as JSON), and only then worry about thei= r efficient representation (e.g. BSON). Just a thought.

    =A0

    Thomas

    =A0

    On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Kris,

    =A0

    You are right. Security Key should be a structured d= ata, besides the key material, it should includes something like lifetime, = KeyID, .....Correct?

    =A0

    Many thanks!

    =A0

    Qin

    =A0

    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@berkeley.edu&g= t; wrote:

    is the security key a string?=A0 That doesn't se= em right.

    ksjp

    =A0

    On 8/19/2013 2:05 PM, Qin Wang wrote:<= /p>

    Hi all,

    =A0

    I separate a thread from thread "Message Flows&= quot;, to discuss the format for management messages, e.g. JSON, BSON, or o= thers.

    =A0

    As Thomas's suggestion, before delvin= g into the representation of the information, we firstly identify what the = contents of the different signaling packets are, and in addition, what the data structures they may use.=A0

    =A0

    I would like to take the commands defined in=A0draft= -wang-6tsch-6top-00 as starting point. Here are the parameters in those com= mands.

    =A0

    //integer

    (1) xxxID, e.g. TrackID, SlotframeID

    (2) xxxOffset, e.g. SlotOffset

    (3) NumOfxxx/Length

    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0

    (5) Status

    (6) ASN (5Byte integer), e.g. last time when a packe= t received from a neighbor

    =A0

    //string

    (7) L2 address

    (8) SecurityKey

    =A0

    //bitmap

    (9) LinkOption

    =A0

    //floating

    (10) Metrics, e.g. PDR, ETX, queuing statistics, ene= rgy-related metrics

    =A0

    Maybe something else........

    =A0

    Now, we can evaluate different representation method= s. What do you think?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0=A0

    =A0

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org=

    https://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7bacbb5c06559304e49d21ca-- From qinwang@berkeley.edu Fri Aug 23 06:59:41 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A88F11E81A4 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 06:59:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.635 X-Spam-Level: X-Spam-Status: No, score=-2.635 tagged_above=-999 required=5 tests=[AWL=-0.259, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_42=0.6, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id c2pFYltOINhV for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 06:59:37 -0700 (PDT) Received: from mail-vc0-f180.google.com (mail-vc0-f180.google.com [209.85.220.180]) by ietfa.amsl.com (Postfix) with ESMTP id DD4DA11E81C0 for <6tsch@ietf.org>; Fri, 23 Aug 2013 06:59:35 -0700 (PDT) Received: by mail-vc0-f180.google.com with SMTP id gf11so427670vcb.25 for <6tsch@ietf.org>; Fri, 23 Aug 2013 06:59:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=sbpz7eE4p0IhQxBwj7xqjhMjByJ3SRaFxM2ixicOfr0=; b=iIx1twXJbMnxUdMuXAeDtIJojpkvB5xu+ufUvs4lpIRpMo3Bxt/tXllTWktGahaKqC Mf8OQ8TJ/sLhq0nfVFS34hXG62DGmzs5kGqqquSZSOyaS0UPtP5CtbTc0pvB6QxloTko ehYh88BcgYqXlY1Exeka/Z5yGJrfVj387t7+QmbYL3bxqASWURXINqAfx/fnQhnx8fkH Y2zcETxiad1yJF9m6cCGS6dD6TwsfN2dPI7GOAPPm3vqVHm1+qBL8wuSxR6EvJMJNZ6P +Lht+qi60Waj9Ki0V8FwZdzoZkWEIkGEy8NrqEbgE5KQeW3e719rOgU2uYC1HEdXbqbr E66Q== X-Gm-Message-State: ALoCoQkpFpyzJHCtcRlDFUagCL09Ug/IEJmwHnH24n8vylFXdiLtBL7CLgddACAZSvQiqkztfNDP MIME-Version: 1.0 X-Received: by 10.221.40.10 with SMTP id to10mr7260805vcb.22.1377266373730; Fri, 23 Aug 2013 06:59:33 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Fri, 23 Aug 2013 06:59:33 -0700 (PDT) In-Reply-To: References: Date: Fri, 23 Aug 2013 21:59:33 +0800 Message-ID: From: Qin Wang To: Maria Rita PALATTELLA Content-Type: multipart/alternative; boundary=001a11337576f7b64104e49dd0b9 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 13:59:41 -0000 --001a11337576f7b64104e49dd0b9 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Thomas and all, Regarding to multiple DODAG case, I believe even we assume the roots are synchronized, it can not be guaranteed that any two nodes in different DODAG are synchronized while the nodes are many hops from their roots. Correct? Can we address the issue in this way: when nodeA is jumping from DODAG1 to DODAG2, the action of re-synchronizing to the preferred parent in DODAG2 is triggered. Make sense? Thanks Qin On Fri, Aug 23, 2013 at 5:11 PM, Maria Rita PALATTELLA < maria-rita.palattella@uni.lu> wrote: > Thomas, see my comments inline.**** > > Maria Rita**** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Friday, August 23, 2013 1:11 AM > *To:* 6tsch@ietf.org > > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > ** ** > > All,**** > > ** ** > > Summarizing the different things we are talking about in this thread:**** > > 1. picking time source neighbors during the operation of the network. > Proposal is to use the (loop-free) RPL DAG. Challenged by Raghuram who > wants to have separate L2 and L3 behavior because of race conditions.**** > > 2. picking time source neighbors during join process. Proposal is to > attach to the node which indicates the lowest join priority in EB. Questi= on > is whether join priority reflects DAGrank or not.**** > > 3. multiple DODAGs: keeping DAGroots sync'ed or participating in several > independent time bases.**** > > ** ** > > My opinion is:**** > > ** ** > > 1. I believe keeping the same DAG structure the same between L2 and L3 > makes sense. If there is no L2 connectivity, L3 cannot function since it > can not speak to and hear the neighbors, so I'm afraid I don't quite foll= ow > the race condition issue.**** > > ** ** > > ** ** > > 2. My inclination is to have the join priority be an indication of the > DAGrank, possible by "rounding off". When joining, a new node will join L= 2 > (i.e. synchronize) as soon as it hears EBs, then join L3 (i.e, acquire a > DAGrank) after hearing DIOs. I would have the node transmit EBs only afte= r > that last step.**** > > ** ** > > [MR] I agree. If we want to use RPL topology information, and RPL parents > as selected synch parents, it makes sense to link the join priority with > the DAGrank.**** > > ** ** > > 3. My opinion is that, for now, we should take the multiple root case int= o > account, but only if they are synchronized through some out-of-band > mechanism.**** > > ** ** > > [MR] I am afraid that multiple DODAGs may imply more complexity, and we > are looking for the basic simplest scenario. Thus, as you pointed out, if > we want to consider multiple roots, we will have to assume, at least for > now, that they are synchronized.**** > > ** ** > > Raw opinions, up for discussion :)**** > > ** ** > > Thomas**** > > ** ** > > On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Dear Qin:**** > > **** > > I think the idea was to make sure that the roots are synchronized.**** > > Certainly the DODAGs may be a bit out of sync as we progress down, but we > expect that the guard time is sufficient.**** > > The alternate would be to sync the whole network completely independent o= f > RPL DAGs etc=85 eg using a GPS.**** > > There might be use cases where that is fine, but we need to document a > default behavior that does not make the assumption of a GPS or similar.**= * > * > > **** > > Makes sense?**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 19:03**** > > > *To:* Pascal Thubert (pthubert) > *Cc:* xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > **** > > Pascal,**** > > **** > > It may bring in some complexity. Think about the case. DODAG1 and DODAG2 > are in a same instance, but have no shared nodes, thus may not be able sy= nc > with each other. A new node (node-A) comes in, wants to join into the tw= o > DODAGs, in another word, want to jump between the two DODAGs. I believe > node-A has to change its time source parent and re-sync when it jump from > one DODAG to another. Right?**** > > **** > > Thank**** > > Qin**** > > **** > > **** > > **** > > **** > > On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > I do not think so, Qin; **** > > **** > > but it is required that a node on one DODAG may jump onto the other, and > to do that, it is useful to monitoring candidates from both dodags.**** > > Note that DODAGs partition the network, and all the parents must be in on= e > of them.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 17:54 > *To:* Pascal Thubert (pthubert) > *Cc:* xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > **** > > Hi Pascal,**** > > **** > > Is it assumed that 2 DODAG in a same instance must have at least one > shared node?**** > > **** > > Thanks**** > > Qin**** > > **** > > On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > The problem is that we have 2 mechanisms that establish a distance to the > root in order to avoid loops, RPL Rank and 4e priority.**** > > Fact is, RPL is probably more elaborate for loop detection and loop > avoidance. I suspect that the priority can easily count to infinity.**** > > So I=92d trust RPL Rank rather than priority, and we seem to agree that w= e > want to time sync with RPL parents.**** > > **** > > a) My question is whether it makes sense and value to have a transition > between a time source based on best (hop count) priority and to one based > on best RPL Rank, or if we could use the rank right away. Seems to me tha= t > life would be easier if we use the Rank right away, though it may make th= e > network a bit slower to come up. Passing from one mode to the other will > demand some specifications, what if one node reboots and goes from one mo= de > to the other, etc=85**** > > **** > > Now if the question is to reuse the priority field, then we can do > actually change the logic to accommodate priority =3D DAGRank(Rank) for n= odes > that are not root, still ensuring that only a node that is already part o= f > a RPL DAG may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease o= f > 255)**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to DAGRank(Rank) that is < 255.**** > > Children sync to whichever prio < 255 neighbor as time source, listen to > DIOs, select a parent, migrate to that parent as time source, and then ca= n > set their own priority to zero and send DIOs. If later they select a bett= er > parent the priority will get lower so that=92s till OK.**** > > Would that fly?**** > > b) about multiple DAGs, there are 2 cases:**** > > - 2 DODAGs in a same instance. We said we want to support that, and that > implies that the various DODAGs are closely time sync=92d.**** > > - 2 DODAGs in 2 different instances. To be discussed. We have use cases > where that could be useful, one instance playing basic slotted aloha and > the other doing more critical jobs. **** > > **** > > We have not agreed on the latter but with a single radio, it seems > problematic if the 2 instances do not share a same sense of time. We=92d = end > up with slot frames that may drift from one another, sometimes overlappin= g=85 > I suspect that we=92d partition time inside a slot frame or using multipl= e > slot frames, but we=92d keep them in sync. Probably there is a need for a > spanning instance (0) for (autonomic) management etc=85 that uses somethi= ng > very simple, always on, very much like your basic draft. If there is such= a > spanning instance, then it can be used to sync everyone, in which casethe > Rank from the dependent instances is not used for time sync.**** > > What do others think?**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* jeudi 22 ao=FBt 2013 15:34 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] time parent selection based on EB priority**** > > **** > > Hi Pascal,**** > > **** > > my comment inline:**** > > **** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0.**** > > Q: Do we really need to build the time sync tree faster than the RPL grap= h? > **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > yes that would work but we are doing the same as the IEEE802-15.4e Join > priority field is for. The 15.4e defines this mechanism and it is inheren= t > to the networks we address so using it is straightforward. Then as > described by Thomas, we only need to use RPL best parent as soon as we ha= ve > one instead of the lowest prio neighbor. **** > > Another question with time sources is the selection of a time source > parent in the case that a node belongs to more than one DODAG. Which pare= nt > is selected then? An more importantly, do the basic draft considers havin= g > more than one DODAG? **** > > thanks! > Xavi**** > > **** > > On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Dear all:**** > > **** > > As you know, RPL may entail temporary loops, in particular if > DAGMaxRankIncrease is not configured to 0.**** > > If as we expect we use the RPL preferred parent tree for time sync, this > will lead to time sync loops. **** > > Two questions here:**** > > 1) how bad is the effect of such loop? I expect that the clocks will > derive rapidly, as if from the perspective of a node the crystal was real= , > real bad.**** > > 2) can we detect that effect and use it to detect a loop in the routing?*= * > ** > > **** > > Please see inline:**** > > **** > > sch] time parent selection based on EB priority**** > > **** > > Qin, Xavi,**** > > **** > > Excellent point. I believe that this is exactly what makes this 6TSCH wor= k > so interesting: figuring out how consolidate the views between upper and > lower layers.**** > > **** > > In my mind, the join priority as you describe looks very much like a > DAGrank. I believe there are, however, two potential questions we should > not forget:**** > > - what if the joining mote does no get all of the EBs of its neighbor?***= * > > - what happens when the topology changes and a node moves up or down in > the DODAG?**** > > **** > > I would suggest the following:**** > > - once the node has fully joined, somehow tie the join priority to its RP= L > DAGrank. We might have to play with the metric to make the join priority > look like a hop count, but I believe it is important the announced join > priority changes when the mote moves up/down in the topology.**** > > - maybe consider the time source parent identified during the joining as > temporary until the final time source parent is discovered. How the final > one is discovered can through some command from the ME (see Qin's > attachement), or after receiving many DIOs.**** > > **** > > [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to = do > like an hop-count-based OF0. **** > > Q: Do we really need to build the time sync tree faster than the RPL > graph? **** > > **** > > If no, maybe me could use the priority as a boolean to mean that the node > is already part of the RPL DAG and may be used as time source.**** > > Initially only the root would be priority 0. All the others would be > default 1.**** > > From there, all nodes that are one hop away from root with good RSSI can > sync with the root, and listen to DIOs, and emit their own, and set their > own priority to zero.**** > > Children sync to whichever prio 0 neighbor as time source, listen to DIOs= , > select a parent, migrate to that parent as time source, and then can set > their own priority to zero and send DIOs.**** > > Would that fly?**** > > Cheers,**** > > Pascal**** > > **** > > On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang wrote:**= * > * > > Agree!**** > > **** > > Qin**** > > **** > > On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > HI Qin, > > as a basic setting we want the most basic approach. I guess that using (1= ) > first priority and then RSSi will avoid having loops. As you say all this > approaches would work but I bet for (1) to be the simplest. **** > > cheers! > X**** > > **** > > On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote:*= * > ** > > Hi Xavi,**** > > **** > > It is a good idea to use Priority in EB as a factor to choose initial tim= e > parent. But, I think there are several ways to use the Priority, and othe= r > metrics like RSSI. For example,**** > > **** > > (1) As you suggested, use Priority first, and then RSSI**** > > (2) or use RSSI first, and then Priority**** > > (3) or use a function of Priority and RSSI.**** > > **** > > I'm not sure which is better. What do you think?**** > > **** > > Qin**** > > **** > > **** > > On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > Hi all, > > I want to propose to add in the basic TSCH draft the fact that when a nod= e > joins a network, it uses the EB join priority defined in the Slot and Lin= k > IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority = is > 0 for the PAN coordinator of the network. A node listening several EB > selects as a time parent the node with lowest EB Join Priority. In case o= f > receiving multiple EBs with the same Join priority then filters by other > metrics e.g RSSI of the link. (note that until a DIO is received nodes do= n > not know about the gradient).**** > > A node when sends an EB uses the lowest EB Join priority it has heard and > adds 1 to it as its own Join priority. > > > Current draft section states that RSSI or another metric should be used t= o > select the initial time parent, this has the problem that loops cannot be > avoided until the first DIO is received. With the proposed approach the > problem is solved and does not introduce anything new, just used what 15.= 4e > provides to us.**** > > what is your opinion?**** > > thanks! > Xavi**** > > **** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --001a11337576f7b64104e49dd0b9 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Thomas and all,

    Regarding to multipl= e DODAG case, I believe even we assume the roots are synchronized, it can n= ot be guaranteed that any two nodes in different DODAG are synchronized whi= le the nodes are many hops from their roots. Correct?

    Can we address the issue in this way: when nodeA is jum= ping from DODAG1 to DODAG2, the action of re-synchronizing to the preferred= parent in DODAG2 is triggered. Make sense?

    Thanks=
    Qin=A0


    On Fri, Aug 23, 2013 at 5:11 PM, Maria Rita PALATTELLA <maria-rita.palattella@uni.lu> wrote:

    Thomas, see my comments i= nline.

    Maria Rita<= /span>

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Friday, August 23, 2013 1:11 AM
    To: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    All,

    =A0

    Summarizing the different things we are talking abou= t in this thread:

    1. picking time source neighbors during the operatio= n of the network. Proposal is to use the (loop-free) RPL DAG. Challenged by= Raghuram who wants to have separate L2 and L3 behavior because of race con= ditions.

    2. picking time source neighbors during join process= . Proposal is to attach to the node which indicates the lowest join priorit= y in EB. Question is whether join priority reflects DAGrank or not.<= u>

    3. multiple DODAGs: keeping DAGroots sync'ed or = participating in several independent time bases.

    =A0

    My opinion is:

    =A0<= /p>

    1. I believe keeping the same DAG structure the same= between L2 and L3 makes sense. If there is no L2 connectivity, L3 cannot f= unction since it can not speak to and hear the neighbors, so I'm afraid= I don't quite follow the race condition issue.

    =A0

    =A0<= /p>

    2. My inclination is to have the join priority be an= indication of the DAGrank, possible by "rounding off". When join= ing, a new node will join L2 (i.e. synchronize) as soon as it hears EBs, th= en join L3 (i.e, acquire a DAGrank) after hearing DIOs. I would have the node transmit EBs only after that last step.=

    =A0<= /p>

    [MR] I agree. If we= want to use RPL topology information, and RPL parents as selected synch pa= rents, =A0it makes sense to link the join priority with the DAGrank.=

    =A0<= /p>

    3. My opinion is that, for now, we should take the m= ultiple root case into account, but only if they are synchronized through s= ome out-of-band mechanism.

    =A0<= /p>

    [MR] I am afraid th= at multiple DODAGs may imply more complexity, and we are looking for the ba= sic simplest scenario. Thus, as you pointed out, if we want to consider multiple roots, we will have to assume, at least for now, that th= ey are synchronized.

    =A0

    Raw opinions, up for discussion :)

    =A0

    Thomas

    =A0

    On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Dear Qin:=

    =A0<= /p>

    I think the idea was to m= ake sure that the roots are synchronized.

    Certainly the DODAGs may = be a bit out of sync as we progress down, but we expect that the guard time is sufficient.

    The alternate would be to= sync the whole network completely independent of RPL DAGs etc=85 eg using a GPS.

    There might be use cases = where that is fine, but we need to document a default behavior that does not make the assumption of a GPS or similar.

    =A0<= /p>

    Makes sense?

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 19:03


    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Pascal,

    =A0

    It may bring in some complexity. Think about the cas= e. DODAG1 and DODAG2 are in a same instance, but have no shared nodes, thus= may not be able sync with each other. =A0A new node (node-A) comes in, wants to join into the two DODAGs, in another word, wan= t to jump between the two DODAGs. =A0I believe node-A has to change its tim= e source parent and re-sync when it jump from one DODAG to another. Right?<= u>

    =A0

    Thank

    Qin

    =A0

    =A0

    =A0

    =A0

    On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    I do not think so, Qin;

    =A0<= /p>

    but it is required that a= node on one DODAG may jump onto the other, and to do that, it is useful to monitoring candidates from both dodags.

    Note that DODAGs partitio= n the network, and all the parents must be in one of them.=

    =A0<= /p>

    Cheers;<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 17:54
    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi Pascal,

    =A0

    Is it assumed that 2 DODAG in a same instance must h= ave at least one shared node?

    =A0

    Thanks

    Qin

    =A0

    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    The problem is that we ha= ve 2 mechanisms that establish a distance to the root in order to avoid loops, RPL Rank and 4e priority.

    Fact is, RPL is probably = more elaborate for loop detection and loop avoidance. I suspect that the priority can easily count to infinity.

    So I=92d trust RPL Rank r= ather than priority, and we seem to agree that we want to time sync with RP= L parents.

    =A0<= /p>

    a) My question is whether= it makes sense and value to have a transition between a time source based on best (hop count) priority and to one based on best RPL Rank, or if we c= ould use the rank right away. Seems to me that life would be easier if we u= se the Rank right away, though it may make the network a bit slower to come= up. Passing from one mode to the other will demand some specifications, what if one node reboots and goes f= rom one mode to the other, etc=85

    =A0<= /p>

    Now if the question is to= reuse the priority field, then we can do actually change the logic to acco= mmodate priority =3D DAGRank(Rank) for nodes that are not root, still ensuring tha= t only a node that is already part of a RPL DAG may be used as time source.=

    Initially only the root w= ould be priority 0. All the others would be default 255 (that is DAGRank(IN= FINITE_RANK) assuming MinHopRankIncrease of 255)

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to DAGRank(= Rank) that is < 255.

    Children sync to whicheve= r prio < 255 neighbor as time source, listen to DIOs, select a parent, m= igrate to that parent as time source, and then can set their own priority to zero= and send DIOs. If later they select a better parent the priority will get = lower so that=92s till OK.

    Would that fly?

    b) about multiple DAGs, t= here are 2 cases:

    - 2 DODAGs in a same inst= ance. We said we want to support that, and that implies that the various DODAGs are closely time sync=92d.

    - 2 DODAGs in 2 different= instances. To be discussed. We have use cases where that could be useful, one instance playing basic slotted aloha and the other doing more critical= jobs.

    =A0<= /p>

    We have not agreed on the= latter but with a single radio, it seems problematic if the 2 instances do not share a same sense of time. We=92d end up with slot frames that may= drift from one another, sometimes overlapping=85 I suspect that we=92d par= tition time inside a slot frame or using multiple slot frames, but we=92d k= eep them in sync. Probably there is a need for a spanning instance (0) for (autonomic) management etc=85 that uses so= mething very simple, always on, very much like your basic draft. If there i= s such a spanning instance, then it can be used to sync everyone, in which = casethe Rank from the dependent instances is not used for time sync.

    What do others think?

    =A0<= /p>

    Pascal

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi Pascal,

    =A0

    my comment inline:

    =A0

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    yes that would work but w= e are doing the same as the IEEE802-15.4e Join priority field is for. The 1= 5.4e defines this mechanism and it is inherent to the networks we address so using it is straightforward. The= n as described by Thomas, we only need to use RPL best parent as soon as we= have one instead of the lowest prio neighbor.=A0

    Another question with tim= e sources is the selection of a time source parent in the case that a node = belongs to more than one DODAG. Which parent is selected then? An more importantly, do the basic draft considers= having more than one DODAG?=A0

    thanks!
    Xavi

    =A0

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pth= ubert) <pthubert= @cisco.com> wrote:

    Dear all:=

    =A0<= /p>

    As you know, RPL may enta= il temporary loops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use th= e RPL preferred parent tree for time sync, this will lead to time sync loop= s.

    Two questions here:

    1) how bad is the effect = of such loop? I expect that the clocks=A0 will derive rapidly, as if from the perspective of a node the crystal was real, real bad.=

    2) can we detect that eff= ect and use it to detect a loop in the routing?

    =A0<= /p>

    Please see inline:=

    =A0<= /p>

    sch] time parent selection based on EB p= riority

    =A0

    Qin, Xavi,

    =A0

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

    =A0

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

    =A0

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important the announced join priority changes when the mote = moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME (see Qin's attachement), or after receiving m= any DIOs.

    =A0<= /p>

    [Pascal] Yes, I read Xavi= =92s proposal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to b= uild the time sync tree faster than the RPL graph?

    =A0<= /p>

    If no, maybe me could use= the priority as a boolean to mean that the node is already part of the RPL DAG and may be used as time source.

    Initially only the root w= ould be priority 0. All the others would be default 1.=

    From there, all nodes tha= t are one hop away from root with good RSSI can sync with the root, and listen to DIOs, and emit their own, and set their own priority to zero.

    Children sync to whicheve= r prio 0 neighbor as time source, listen to DIOs, select a parent, migrate to that parent as time source, and then can set their own priority to zero= and send DIOs.

    Would that fly?

    Cheers,

    Pascal

    =A0

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

    =A0

    Qin

    =A0

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

    =A0

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

    =A0

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

    =A0

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

    =A0

    I'm not sure which is better. What do you think?=

    =A0

    Qin

    =A0

    =A0

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

    =A0

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
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    6tsch@ietf.org
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    --001a11337576f7b64104e49dd0b9-- From rsudhaak@cisco.com Fri Aug 23 07:47:31 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 83DE011E82FB for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 07:47:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.298 X-Spam-Level: X-Spam-Status: No, score=-10.298 tagged_above=-999 required=5 tests=[AWL=-0.300, BAYES_00=-2.599, HTML_MESSAGE=0.001, J_CHICKENPOX_42=0.6, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lHj-XmksRnL0 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 07:47:07 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id EAD7011E82F9 for <6tsch@ietf.org>; Fri, 23 Aug 2013 07:46:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=52874; q=dns/txt; s=iport; t=1377269218; x=1378478818; h=from:to:subject:date:message-id:in-reply-to:mime-version; bh=+DECwDVwhXBV0dCaAQMacUaKOwLWFgUKjO7nSlyspf4=; b=GeNM1Rg+w+oe2hH5UGZjJvOIyTJcimsynHOHWtqvGLrh3Y+oaj7TX/Om 8xGtQH3/ELcmiZA0tizatuyawHen54K9x9ebiOUJKZdKN0itNTbAEYbqA SV+lESD76CgJGDUF2Doy58L6SCzkpPUZimdsN8SRFh7C3/MlKraQn5qJX g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjMFAEd1F1KtJV2Y/2dsb2JhbABaDoI1RDVRv3eBHxZ0giQBAQEEAQEBF1QdAQgRAwEBAQsLCwEGLgsUCQgCBAESCBGHaAy3EQSQPyANCgEKgxJ8A4VJjgdBlTeCXz+BaCQe X-IronPort-AV: E=Sophos;i="4.89,941,1367971200"; d="scan'208,217";a="250918509" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by rcdn-iport-2.cisco.com with ESMTP; 23 Aug 2013 14:46:56 +0000 Received: from xhc-aln-x04.cisco.com (xhc-aln-x04.cisco.com [173.36.12.78]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id r7NEkuGt001642 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Fri, 23 Aug 2013 14:46:56 GMT Received: from xmb-rcd-x04.cisco.com ([169.254.8.201]) by xhc-aln-x04.cisco.com ([173.36.12.78]) with mapi id 14.02.0318.004; Fri, 23 Aug 2013 09:46:56 -0500 From: "Raghuram Sudhaakar (rsudhaak)" To: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: [6tsch] time parent selection based on EB priority Thread-Index: AQHOoA+d1zmqugjsCkq4Ny6s1sT63g== Date: Fri, 23 Aug 2013 14:46:56 +0000 Message-ID: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A8D1@xmb-rcd-x04.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.6.130613 x-originating-ip: [10.21.120.157] Content-Type: multipart/alternative; boundary="_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A8D1xmbrcdx04ciscoc_" MIME-Version: 1.0 Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 14:47:32 -0000 --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A8D1xmbrcdx04ciscoc_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Please see inline From: Thomas Watteyne > Date: Thursday, August 22, 2013 4:10 PM To: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] time parent selection based on EB priority All, Summarizing the different things we are talking about in this thread: 1. picking time source neighbors during the operation of the network. Propo= sal is to use the (loop-free) RPL DAG. Challenged by Raghuram who wants to = have separate L2 and L3 behavior because of race conditions. 2. picking time source neighbors during join process. Proposal is to attach= to the node which indicates the lowest join priority in EB. Question is wh= ether join priority reflects DAGrank or not. 3. multiple DODAGs: keeping DAGroots sync'ed or participating in several in= dependent time bases. My opinion is: 1. I believe keeping the same DAG structure the same between L2 and L3 make= s sense. If there is no L2 connectivity, L3 cannot function since it can no= t speak to and hear the neighbors, so I'm afraid I don't quite follow the r= ace condition issue. I support the idea of keeping the same DAG structure between L2 and L3. To explain what I was referring to - The RPL trickle timer period can very easily become a large value if the ne= twork is static. In this time if a node does switch off, it is most like th= at L2 will detect it first since it would have received EB from its current= parent. Now if we force it that the RPL parent has to be the timing parent= we cannot find a timing parent until L3 detects the topology change. If we= allow L2 to initiate a join process and choose a new timing parent and inf= orm L3 we may be violating the RPL OF. This is the situation that I was ref= erring to. I feel that there is a fair probability of this happening. Thoug= hts ? To address this we probably need to allow RPL to change the topology based = on the OF, after L2 join has occurred. Then L2 can change its timing parent= to be synced with DAG structure. 2. My inclination is to have the join priority be an indication of the DAGr= ank, possible by "rounding off". When joining, a new node will join L2 (i.e= . synchronize) as soon as it hears EBs, then join L3 (i.e, acquire a DAGran= k) after hearing DIOs. I would have the node transmit EBs only after that l= ast step. 3. My opinion is that, for now, we should take the multiple root case into = account, but only if they are synchronized through some out-of-band mechani= sm. Raw opinions, up for discussion :) Thomas On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) > wrote: Dear Qin: I think the idea was to make sure that the roots are synchronized. Certainly the DODAGs may be a bit out of sync as we progress down, but we e= xpect that the guard time is sufficient. The alternate would be to sync the whole network completely independent of = RPL DAGs etc=85 eg using a GPS. There might be use cases where that is fine, but we need to document a defa= ult behavior that does not make the assumption of a GPS or similar. Makes sense? Cheers, Pascal From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: jeudi 22 ao=FBt 2013 19:03 To: Pascal Thubert (pthubert) Cc: xvilajosana@eecs.berkeley.edu; Th= omas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Pascal, It may bring in some complexity. Think about the case. DODAG1 and DODAG2 ar= e in a same instance, but have no shared nodes, thus may not be able sync w= ith each other. A new node (node-A) comes in, wants to join into the two D= ODAGs, in another word, want to jump between the two DODAGs. I believe nod= e-A has to change its time source parent and re-sync when it jump from one = DODAG to another. Right? Thank Qin On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) > wrote: I do not think so, Qin; but it is required that a node on one DODAG may jump onto the other, and to= do that, it is useful to monitoring candidates from both dodags. Note that DODAGs partition the network, and all the parents must be in one = of them. Cheers; Pascal From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: jeudi 22 ao=FBt 2013 17:54 To: Pascal Thubert (pthubert) Cc: xvilajosana@eecs.berkeley.edu; Th= omas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi Pascal, Is it assumed that 2 DODAG in a same instance must have at least one shared= node? Thanks Qin On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) > wrote: Hello Xavi: The problem is that we have 2 mechanisms that establish a distance to the r= oot in order to avoid loops, RPL Rank and 4e priority. Fact is, RPL is probably more elaborate for loop detection and loop avoidan= ce. I suspect that the priority can easily count to infinity. So I=92d trust RPL Rank rather than priority, and we seem to agree that we = want to time sync with RPL parents. a) My question is whether it makes sense and value to have a transition bet= ween a time source based on best (hop count) priority and to one based on b= est RPL Rank, or if we could use the rank right away. Seems to me that life= would be easier if we use the Rank right away, though it may make the netw= ork a bit slower to come up. Passing from one mode to the other will demand= some specifications, what if one node reboots and goes from one mode to th= e other, etc=85 Now if the question is to reuse the priority field, then we can do actually= change the logic to accommodate priority =3D DAGRank(Rank) for nodes that = are not root, still ensuring that only a node that is already part of a RPL= DAG may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease of 255) >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to DAGRank(Rank) that is < 255. Children sync to whichever prio < 255 neighbor as time source, listen to DI= Os, select a parent, migrate to that parent as time source, and then can se= t their own priority to zero and send DIOs. If later they select a better p= arent the priority will get lower so that=92s till OK. Would that fly? b) about multiple DAGs, there are 2 cases: - 2 DODAGs in a same instance. We said we want to support that, and that im= plies that the various DODAGs are closely time sync=92d. - 2 DODAGs in 2 different instances. To be discussed. We have use cases whe= re that could be useful, one instance playing basic slotted aloha and the o= ther doing more critical jobs. We have not agreed on the latter but with a single radio, it seems problema= tic if the 2 instances do not share a same sense of time. We=92d end up wit= h slot frames that may drift from one another, sometimes overlapping=85 I s= uspect that we=92d partition time inside a slot frame or using multiple slo= t frames, but we=92d keep them in sync. Probably there is a need for a span= ning instance (0) for (autonomic) management etc=85 that uses something ver= y simple, always on, very much like your basic draft. If there is such a sp= anning instance, then it can be used to sync everyone, in which casethe Ran= k from the dependent instances is not used for time sync. What do others think? Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: jeudi 22 ao=FBt 2013 15:34 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] time parent selection based on EB priority Hi Pascal, my comment inline: [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to do= like an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? yes that would work but we are doing the same as the IEEE802-15.4e Join pri= ority field is for. The 15.4e defines this mechanism and it is inherent to = the networks we address so using it is straightforward. Then as described b= y Thomas, we only need to use RPL best parent as soon as we have one instea= d of the lowest prio neighbor. Another question with time sources is the selection of a time source parent= in the case that a node belongs to more than one DODAG. Which parent is se= lected then? An more importantly, do the basic draft considers having more = than one DODAG? thanks! Xavi On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) > wrote: Dear all: As you know, RPL may entail temporary loops, in particular if DAGMaxRankInc= rease is not configured to 0. If as we expect we use the RPL preferred parent tree for time sync, this wi= ll lead to time sync loops. Two questions here: 1) how bad is the effect of such loop? I expect that the clocks will deriv= e rapidly, as if from the perspective of a node the crystal was real, real = bad. 2) can we detect that effect and use it to detect a loop in the routing? Please see inline: sch] time parent selection based on EB priority Qin, Xavi, Excellent point. I believe that this is exactly what makes this 6TSCH work = so interesting: figuring out how consolidate the views between upper and lo= wer layers. In my mind, the join priority as you describe looks very much like a DAGran= k. I believe there are, however, two potential questions we should not forg= et: - what if the joining mote does no get all of the EBs of its neighbor? - what happens when the topology changes and a node moves up or down in the= DODAG? I would suggest the following: - once the node has fully joined, somehow tie the join priority to its RPL = DAGrank. We might have to play with the metric to make the join priority lo= ok like a hop count, but I believe it is important the announced join prior= ity changes when the mote moves up/down in the topology. - maybe consider the time source parent identified during the joining as te= mporary until the final time source parent is discovered. How the final one= is discovered can through some command from the ME (see Qin's attachement)= , or after receiving many DIOs. [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to do= like an hop-count-based OF0. Q: Do we really need to build the time sync tree faster than the RPL graph? If no, maybe me could use the priority as a boolean to mean that the node i= s already part of the RPL DAG and may be used as time source. Initially only the root would be priority 0. All the others would be defaul= t 1. >From there, all nodes that are one hop away from root with good RSSI can sy= nc with the root, and listen to DIOs, and emit their own, and set their own= priority to zero. Children sync to whichever prio 0 neighbor as time source, listen to DIOs, = select a parent, migrate to that parent as time source, and then can set th= eir own priority to zero and send DIOs. Would that fly? Cheers, Pascal On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang > wrote: Agree! Qin On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen > wrote: HI Qin, as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest. cheers! X On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang > wrote: Hi Xavi, It is a good idea to use Priority in EB as a factor to choose initial time = parent. But, I think there are several ways to use the Priority, and other = metrics like RSSI. For example, (1) As you suggested, use Priority first, and then RSSI (2) or use RSSI first, and then Priority (3) or use a function of Priority and RSSI. I'm not sure which is better. What do you think? Qin On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen > wrote: Hi all, I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB sele= cts as a time parent the node with lowest EB Join Priority. In case of rece= iving multiple EBs with the same Join priority then filters by other metric= s e.g RSSI of the link. (note that until a DIO is received nodes don not kn= ow about the gradient). A node when sends an EB uses the lowest EB Join priority it has heard and a= dds 1 to it as its own Join priority. Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e pro= vides to us. what is your opinion? thanks! Xavi _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A8D1xmbrcdx04ciscoc_ Content-Type: text/html; charset="Windows-1252" Content-ID: <9075DBF4E21E1146BE3DE5CE63062228@emea.cisco.com> Content-Transfer-Encoding: quoted-printable
    Please see inline

    From: Thomas Watteyne <watteyne@eecs.berkeley.edu> Date: Thursday, August 22, 2013 4:1= 0 PM
    To: "6tsch@ietf.org" <6ts= ch@ietf.org>
    Subject: Re: [6tsch] time parent se= lection based on EB priority

    [Pascal] Yes, I read Xavi=92s proposa= l as a mechanism parallel to RPL to do like an hop-count-based OF0.<= u>

    Q: Do we really need to build the time sync tree fast= er than the RPL graph?

    =A0

    If no, maybe me could use the priority as a boolean t= o mean that the node is already part of the RPL DAG and may be used as time= source.

    Initially only the root would be priority 0. All the = others would be default 1.

    Fr= om there, all nodes that are one hop away from root with good RSSI can sync= with the root, and listen to DIOs, and emit their own, and set their own p= riority to zero.

    Children sync to whichever prio 0 neighbor as time so= urce, listen to DIOs, select a parent, migrate to that parent as time sourc= e, and then can set their own priority to zero and send DIOs.=

    Would that fly?

    yes that would work bu= t we are doing the same as the IEEE802-15.4e Join priority field is for. Th= e 15.4e defines this mechanism and it is inherent to the networks we addres= s so using it is straightforward. Then as described by Thomas, we only need= to use RPL best parent as soon as we have one instead of the lowest prio n= eighbor.=A0

    Another question with time sources is the selection of= a time source parent in the case that a node belongs to more than one DODA= G. Which parent is selected then? An more importantly, do the basic draft c= onsiders having more than one DODAG?=A0

    thanks!
    Xavi


    --bcaec520e4f1d12cd304e49e8313-- From qinwang@berkeley.edu Fri Aug 23 07:52:10 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 67E3911E8307 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 07:52:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.324 X-Spam-Level: X-Spam-Status: No, score=-2.324 tagged_above=-999 required=5 tests=[AWL=-0.548, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_33=0.6, J_CHICKENPOX_44=0.6, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AKzfk904+vLj for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 07:52:05 -0700 (PDT) Received: from mail-vb0-f53.google.com (mail-vb0-f53.google.com [209.85.212.53]) by ietfa.amsl.com (Postfix) with ESMTP id E530311E81B8 for <6tsch@ietf.org>; Fri, 23 Aug 2013 07:52:02 -0700 (PDT) Received: by mail-vb0-f53.google.com with SMTP id i3so512409vbh.12 for <6tsch@ietf.org>; Fri, 23 Aug 2013 07:52:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=fY5imZYXEshS8zJO5Z66EY3ijn9zYrecxD28zZUFgy8=; b=YByvsPoJh+iY1naYH36pN0X1KoNtci46ZmJj/XsR5noxI4W49qI6S7Pr7VYBE4Ulq9 QsUpt19l9ky+8LIUZLrueGRF+EIHhbbEUtqLzDF7MRydMR6x4i3YXH1K+ncDY5MxXAxC GwBFC0wz07OAjxf9GavJY9f+B0LqHz2DpFQ+cWL9+Wvw1NTTHjhM84kQNHZUoNFtkfHT Vfs/DFu+ajXFKJhRoTVLRJjsy8M5cSxz83jhYxSRhxu8Vz16RqEUJ4u4U6lH2cO7Eupo +zMrxhF/Hud3r9Rg6PPFE4nEWueRs+VHgkEr63KuXizaMko5hpIo166/ZyQf1x8Dc3F3 VeyA== X-Gm-Message-State: ALoCoQlv76KkM1gLXXtMsgQE8ZLAK81JSf9GgERP6FWYo4sb7oNXo8yUY0hL54Pzq7BJr04GJizj MIME-Version: 1.0 X-Received: by 10.58.146.196 with SMTP id te4mr17578veb.62.1377269522271; Fri, 23 Aug 2013 07:52:02 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Fri, 23 Aug 2013 07:52:02 -0700 (PDT) In-Reply-To: References: Date: Fri, 23 Aug 2013 22:52:02 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7b66fd3ba2bc9a04e49e8cd8 Cc: "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 14:52:10 -0000 --047d7b66fd3ba2bc9a04e49e8cd8 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Sure! Qin On Fri, Aug 23, 2013 at 10:49 PM, Thomas Watteyne < watteyne@eecs.berkeley.edu> wrote: > Qin, > Could we please bring this up when presenting your section during the cal= l > in 15min? > Thanks, > Thomas > > > On Fri, Aug 23, 2013 at 6:10 AM, Qin Wang wrote: > >> Thomas, >> >> We can separate centralized case and distributed case to think about it. >> >> (1) centralized case: PCE will configure the report/alarm criteria and >> provision tracks used for the node to send message to the ME in PCE in >> advance, so, the ME in PCE should be well prepared when the node is send= ing >> the 10pkts/s. >> >> (2) distributed case: the ME is in the upper layer of the same node, so >> event-driven mechanism can be used. >> >> Make sense? >> >> Qin >> >> >> >> On Fri, Aug 23, 2013 at 7:19 AM, Thomas Watteyne < >> watteyne@eecs.berkeley.edu> wrote: >> >>> Qin, >>> >>> I wasn't clear, sorry! What I mean is, if I'm a node in the network and >>> suddently I feel like sending 10 pkts/s to a different node, how do I l= et >>> the ME know to it can provision the slots? >>> >>> Thomas >>> >>> >>> On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) < >>> pthubert@cisco.com> wrote: >>> >>>> Perfect sync : )**** >>>> >>>> ** ** >>>> >>>> The questions top down are which device talks to which devices and to >>>> express what.**** >>>> >>>> Now it=92s good to have an idea of the formalism we expect to be using= to >>>> make sure that it fits as we refine our work.**** >>>> >>>> Carsten will participate to the call tomorrow to present CBOR.**** >>>> >>>> ** ** >>>> >>>> Cheers,**** >>>> >>>> ** ** >>>> >>>> Pascal**** >>>> >>>> ** ** >>>> >>>> *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On >>>> Behalf Of *Xavier Vilajosana Guillen >>>> *Sent:* mardi 20 ao=FBt 2013 15:29 >>>> *To:* Thomas Watteyne >>>> *Cc:* 6tsch@ietf.org >>>> *Subject:* Re: [6tsch] data structure and format for management packet= s >>>> **** >>>> >>>> ** ** >>>> >>>> Hi, one cent more to what Thomas says.**** >>>> >>>> ** ** >>>> >>>> IMHO, the most important thing is the content and secondary is the >>>> representation, at least at that time. So my feeling is that we need f= irst >>>> to identify the content, and later express it json,bson or any other >>>> compressed format.**** >>>> >>>> ** ** >>>> >>>> One possible way to think on that is go in a two way approach, bottom >>>> up and top down, i.e someone needs to describe what the PCE,etc .. nee= d, >>>> another can take the 6top commands and go up from there. From this two >>>> specifications we will be able to identify what is missing and how to = match >>>> things. **** >>>> >>>> ** ** >>>> >>>> just thoughts.**** >>>> >>>> X**** >>>> >>>> ** ** >>>> >>>> On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne < >>>> watteyne@eecs.berkeley.edu> wrote:**** >>>> >>>> Qin,**** >>>> >>>> ** ** >>>> >>>> Thanks for starting the thread! I have comment which my sound a bit >>>> vague, but it's on purpose :)**** >>>> >>>> ** ** >>>> >>>> Do you envision that the flows will match the 6tos commands exactly? >>>> That is, are you considering that the packets sent between different >>>> devices in the network (PCE, motes, etc) contain the same commands as = the >>>> 6top set of commands from >>>> http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4?**** >>>> >>>> ** ** >>>> >>>> Maybe we could by identifying the flows that we are considering, then >>>> the contents of those packets (possibly described using some high leve= l >>>> representation such as JSON), and only then worry about their efficien= t >>>> representation (e.g. BSON). Just a thought.**** >>>> >>>> ** ** >>>> >>>> Thomas**** >>>> >>>> ** ** >>>> >>>> On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote= : >>>> **** >>>> >>>> Hi Kris,**** >>>> >>>> ** ** >>>> >>>> You are right. Security Key should be a structured data, besides the >>>> key material, it should includes something like lifetime, KeyID, >>>> .....Correct?**** >>>> >>>> ** ** >>>> >>>> Many thanks!**** >>>> >>>> ** ** >>>> >>>> Qin**** >>>> >>>> ** ** >>>> >>>> On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote= : >>>> **** >>>> >>>> is the security key a string? That doesn't seem right. >>>> >>>> ksjp**** >>>> >>>> ** ** >>>> >>>> On 8/19/2013 2:05 PM, Qin Wang wrote:**** >>>> >>>> Hi all, **** >>>> >>>> ** ** >>>> >>>> I separate a thread from thread "Message Flows", to discuss the format >>>> for management messages, e.g. JSON, BSON, or others.**** >>>> >>>> ** ** >>>> >>>> As Thomas's suggestion, before delving into the representation of the >>>> information, we firstly identify what the contents of the different >>>> signaling packets are, and in addition, what the data structures they = may >>>> use. **** >>>> >>>> ** ** >>>> >>>> I would like to take the commands defined in draft-wang-6tsch-6top-00 >>>> as starting point. Here are the parameters in those commands.**** >>>> >>>> ** ** >>>> >>>> //integer**** >>>> >>>> (1) xxxID, e.g. TrackID, SlotframeID**** >>>> >>>> (2) xxxOffset, e.g. SlotOffset**** >>>> >>>> (3) NumOfxxx/Length**** >>>> >>>> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority **** >>>> >>>> (5) Status**** >>>> >>>> (6) ASN (5Byte integer), e.g. last time when a packet received from a >>>> neighbor**** >>>> >>>> ** ** >>>> >>>> //string**** >>>> >>>> (7) L2 address**** >>>> >>>> (8) SecurityKey**** >>>> >>>> ** ** >>>> >>>> //bitmap**** >>>> >>>> (9) LinkOption**** >>>> >>>> ** ** >>>> >>>> //floating**** >>>> >>>> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metric= s >>>> **** >>>> >>>> ** ** >>>> >>>> Maybe something else........**** >>>> >>>> ** ** >>>> >>>> Now, we can evaluate different representation methods. What do you >>>> think?**** >>>> >>>> ** ** >>>> >>>> Thanks**** >>>> >>>> Qin**** >>>> >>>> ** ** >>>> >>>> ** ** >>>> >>>> **** >>>> >>>> ** ** >>>> >>>> _______________________________________________**** >>>> >>>> 6tsch mailing list**** >>>> >>>> 6tsch@ietf.org**** >>>> >>>> https://www.ietf.org/mailman/listinfo/6tsch**** >>>> >>>> ** ** >>>> >>>> ** ** >>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch**** >>>> >>>> ** ** >>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch**** >>>> >>>> ** ** >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> > --047d7b66fd3ba2bc9a04e49e8cd8 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Sure!

    Qin


    On Fri, Aug 23, 2013 at 10:49 P= M, Thomas Watteyne <watteyne@eecs.berkeley.edu> wro= te:
    Qin,
    Could we please br= ing this up when presenting your section during the call in 15min?
    Thanks,
    Thomas


    On Fri, Aug = 23, 2013 at 6:10 AM, Qin Wang <qinwang@berkeley.edu> wrot= e:
    Thomas,

    = We can separate centralized case and distributed case to think about it.

    (1) centralized case: PCE will configure the report/ala= rm criteria and provision tracks used for the node to send message to the M= E in PCE in advance, so, the ME in PCE should be well prepared when the nod= e is sending the 10pkts/s.=A0

    (2) distributed case: the ME is in the upper layer of t= he same node, so event-driven mechanism can be used.

    Make sense?

    Qin



    On Fri, Aug 23, 2013 at 7:19 AM, Thomas = Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    I wasn't clear, sorry! What I = mean is, if I'm a node in the network and suddently I feel like sending= 10 pkts/s to a different node, how do I let the ME know to it can provisio= n the slots?

    Thomas


    On Thu, Aug 22, 2013 at 12= :00 PM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrot= e:

    Perf= ect sync : )

    =A0<= /p>

    The questions top down ar= e which device talks to which devices and to express what.

    Now it=92s good to have a= n idea of the formalism we expect to be using to make sure that it fits as = we refine our work.

    Carsten will participate = to the call tomorrow to present CBOR.

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: mardi 20 ao=FBt 2013 15:29
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] data structure and format for management packet= s

    =A0

    Hi, one cent more to what Thomas says.=

    =A0

    IMHO, the most important thing is the content and se= condary is the representation, at least at that time. So my feeling is that= we need first to identify the content, and later express it json,bson or a= ny other compressed format.

    =A0

    One possible way to think on that is go in a two way= approach, bottom up and top down, i.e someone needs to describe what the P= CE,etc .. need, another can take the 6top commands and go up from there. Fr= om this two specifications we will be able to identify what is missing and how to match things.=A0<= /u>

    =A0

    just thoughts.

    X

    =A0

    On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne &l= t;watteyne@= eecs.berkeley.edu> wrote:

    Qin,

    =A0

    Thanks for starting the thread! I have comment which= my sound a bit vague, but it's on purpose :)

    =A0

    Do you envision that the flows will match the 6tos c= ommands exactly? That is, are you considering that the packets sent between= different devices in the network (PCE, motes, etc) contain the same comman= ds as the 6top set of commands from=A0http://tools.ietf.= org/html/draft-wang-6tsch-6top-00#section-2.4?

    =A0

    Maybe we could by identifying the flows that we are = considering, then the contents of those packets (possibly described using s= ome high level representation such as JSON), and only then worry about thei= r efficient representation (e.g. BSON). Just a thought.

    =A0

    Thomas

    =A0

    On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Kris,

    =A0

    You are right. Security Key should be a structured d= ata, besides the key material, it should includes something like lifetime, = KeyID, .....Correct?

    =A0

    Many thanks!

    =A0

    Qin

    =A0

    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@berkeley.edu&g= t; wrote:

    is the security key a string?=A0 That doesn't se= em right.

    ksjp

    =A0

    On 8/19/2013 2:05 PM, Qin Wang wrote:<= /p>

    Hi all,

    =A0

    I separate a thread from thread "Message Flows&= quot;, to discuss the format for management messages, e.g. JSON, BSON, or o= thers.

    =A0

    As Thomas's suggestion, before delvin= g into the representation of the information, we firstly identify what the = contents of the different signaling packets are, and in addition, what the data structures they may use.=A0

    =A0

    I would like to take the commands defined in=A0draft= -wang-6tsch-6top-00 as starting point. Here are the parameters in those com= mands.

    =A0

    //integer

    (1) xxxID, e.g. TrackID, SlotframeID

    (2) xxxOffset, e.g. SlotOffset

    (3) NumOfxxx/Length

    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0

    (5) Status

    (6) ASN (5Byte integer), e.g. last time when a packe= t received from a neighbor

    =A0

    //string

    (7) L2 address

    (8) SecurityKey

    =A0

    //bitmap

    (9) LinkOption

    =A0

    //floating

    (10) Metrics, e.g. PDR, ETX, queuing statistics, ene= rgy-related metrics

    =A0

    Maybe something else........

    =A0

    Now, we can evaluate different representation method= s. What do you think?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0=A0

    =A0

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org=

    https://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch




    --047d7b66fd3ba2bc9a04e49e8cd8-- From twatteyne@gmail.com Fri Aug 23 07:52:22 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1AAE111E830A for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 07:52:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.54 X-Spam-Level: X-Spam-Status: No, score=-1.54 tagged_above=-999 required=5 tests=[AWL=-0.163, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_42=0.6, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XNagBj+J-q7y for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 07:52:19 -0700 (PDT) Received: from mail-pa0-x22c.google.com (mail-pa0-x22c.google.com [IPv6:2607:f8b0:400e:c03::22c]) by ietfa.amsl.com (Postfix) with ESMTP id B935911E82FA for <6tsch@ietf.org>; Fri, 23 Aug 2013 07:52:19 -0700 (PDT) Received: by mail-pa0-f44.google.com with SMTP id fz6so771246pac.31 for <6tsch@ietf.org>; Fri, 23 Aug 2013 07:52:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=UtBgwTj74Sic0n8xsHBSbenCgFV1G4rJ6B1ARR7tJ1I=; b=qsvWFClb5b8v8wHtqqU3+76dbf9P3vZknCLTQmj9Pml2nHOWu7L+cLMkl1vsmnz7Bs avRqYmYBvNQ29w9akiFIlPgICqhdt9xvQB5BxG2WcswDQJTX5Cni2vMoKD6sshG3w1ae d5yOg8T6IwW6qTOMIjSrocqujFTp8PmJhH0rM+8knz1nKa99RSbCHGykEoQY9darO+qq qo8yemMyg+cirrowvJU8s2TaKbS1EOchsv54DRBrWKHx/ilVp7QVvESjVP9IjmJYi6ot ITLIkfYbhSLcUgXvvf0cHDF/DOA4E5XBYxSJPbzRIQ178SSi6uSkp5LzTFpf3Uzk+naE yU6w== X-Received: by 10.68.235.37 with SMTP id uj5mr120399pbc.85.1377269539372; Fri, 23 Aug 2013 07:52:19 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 23 Aug 2013 07:51:59 -0700 (PDT) In-Reply-To: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A8D1@xmb-rcd-x04.cisco.com> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A8D1@xmb-rcd-x04.cisco.com> From: Thomas Watteyne Date: Fri, 23 Aug 2013 07:51:59 -0700 X-Google-Sender-Auth: tGwB51VeSUpAtqDArOhZ38i6dHw Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b33c788a7874104e49e8d36 Subject: Re: [6tsch] time parent selection based on EB priority X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 14:52:22 -0000 --047d7b33c788a7874104e49e8d36 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Raghuram, Thanks for your explanation, your point is very clear now. Let's discuss during the call. Thomas On Fri, Aug 23, 2013 at 7:46 AM, Raghuram Sudhaakar (rsudhaak) < rsudhaak@cisco.com> wrote: > Please see inline > > From: Thomas Watteyne > Date: Thursday, August 22, 2013 4:10 PM > To: "6tsch@ietf.org" <6tsch@ietf.org> > > Subject: Re: [6tsch] time parent selection based on EB priority > > All, > > Summarizing the different things we are talking about in this thread: > 1. picking time source neighbors during the operation of the network. > Proposal is to use the (loop-free) RPL DAG. Challenged by Raghuram who > wants to have separate L2 and L3 behavior because of race conditions. > 2. picking time source neighbors during join process. Proposal is to > attach to the node which indicates the lowest join priority in EB. Questi= on > is whether join priority reflects DAGrank or not. > 3. multiple DODAGs: keeping DAGroots sync'ed or participating in several > independent time bases. > > My opinion is: > 1. I believe keeping the same DAG structure the same between L2 and L3 > makes sense. If there is no L2 connectivity, L3 cannot function since it > can not speak to and hear the neighbors, so I'm afraid I don't quite foll= ow > the race condition issue. > I support the idea of keeping the same DAG structure between L2 and L3. > > To explain what I was referring to - > The RPL trickle timer period can very easily become a large value if the > network is static. In this time if a node does switch off, it is most lik= e > that L2 will detect it first since it would have received EB from its > current parent. Now if we force it that the RPL parent has to be the timi= ng > parent we cannot find a timing parent until L3 detects the topology chang= e. > If we allow L2 to initiate a join process and choose a new timing parent > and inform L3 we may be violating the RPL OF. This is the situation that = I > was referring to. I feel that there is a fair probability of this > happening. Thoughts ? > > To address this we probably need to allow RPL to change the topology > based on the OF, after L2 join has occurred. Then L2 can change its timin= g > parent to be synced with DAG structure. > > 2. My inclination is to have the join priority be an indication of the > DAGrank, possible by "rounding off". When joining, a new node will join L= 2 > (i.e. synchronize) as soon as it hears EBs, then join L3 (i.e, acquire a > DAGrank) after hearing DIOs. I would have the node transmit EBs only afte= r > that last step. > > 3. My opinion is that, for now, we should take the multiple root case > into account, but only if they are synchronized through some out-of-band > mechanism. > > > Raw opinions, up for discussion :) > > Thomas > > On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote: > >> Dear Qin:**** >> >> ** ** >> >> I think the idea was to make sure that the roots are synchronized.**** >> >> Certainly the DODAGs may be a bit out of sync as we progress down, but w= e >> expect that the guard time is sufficient.**** >> >> The alternate would be to sync the whole network completely independent >> of RPL DAGs etc=85 eg using a GPS.**** >> >> There might be use cases where that is fine, but we need to document a >> default behavior that does not make the assumption of a GPS or similar.*= * >> ** >> >> ** ** >> >> Makes sense?**** >> >> ** ** >> >> Cheers,**** >> >> ** ** >> >> Pascal**** >> >> ** ** >> >> *From:* Qin Wang [mailto:qinwang@berkeley.edu] >> *Sent:* jeudi 22 ao=FBt 2013 19:03 >> >> *To:* Pascal Thubert (pthubert) >> *Cc:* xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org >> *Subject:* Re: [6tsch] time parent selection based on EB priority**** >> >> ** ** >> >> Pascal,**** >> >> ** ** >> >> It may bring in some complexity. Think about the case. DODAG1 and DODAG2 >> are in a same instance, but have no shared nodes, thus may not be able s= ync >> with each other. A new node (node-A) comes in, wants to join into the t= wo >> DODAGs, in another word, want to jump between the two DODAGs. I believe >> node-A has to change its time source parent and re-sync when it jump fro= m >> one DODAG to another. Right?**** >> >> ** ** >> >> Thank**** >> >> Qin**** >> >> ** ** >> >> ** ** >> >> ** ** >> >> ** ** >> >> On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pthubert) < >> pthubert@cisco.com> wrote:**** >> >> I do not think so, Qin; **** >> >> **** >> >> but it is required that a node on one DODAG may jump onto the other, and >> to do that, it is useful to monitoring candidates from both dodags.**** >> >> Note that DODAGs partition the network, and all the parents must be in >> one of them.**** >> >> **** >> >> Cheers;**** >> >> **** >> >> Pascal**** >> >> **** >> >> *From:* Qin Wang [mailto:qinwang@berkeley.edu] >> *Sent:* jeudi 22 ao=FBt 2013 17:54 >> *To:* Pascal Thubert (pthubert) >> *Cc:* xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org**** >> >> >> *Subject:* Re: [6tsch] time parent selection based on EB priority**** >> >> **** >> >> Hi Pascal,**** >> >> **** >> >> Is it assumed that 2 DODAG in a same instance must have at least one >> shared node?**** >> >> **** >> >> Thanks**** >> >> Qin**** >> >> **** >> >> On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pthubert) < >> pthubert@cisco.com> wrote:**** >> >> Hello Xavi:**** >> >> **** >> >> The problem is that we have 2 mechanisms that establish a distance to th= e >> root in order to avoid loops, RPL Rank and 4e priority.**** >> >> Fact is, RPL is probably more elaborate for loop detection and loop >> avoidance. I suspect that the priority can easily count to infinity.**** >> >> So I=92d trust RPL Rank rather than priority, and we seem to agree that = we >> want to time sync with RPL parents.**** >> >> **** >> >> a) My question is whether it makes sense and value to have a transition >> between a time source based on best (hop count) priority and to one base= d >> on best RPL Rank, or if we could use the rank right away. Seems to me th= at >> life would be easier if we use the Rank right away, though it may make t= he >> network a bit slower to come up. Passing from one mode to the other will >> demand some specifications, what if one node reboots and goes from one m= ode >> to the other, etc=85**** >> >> **** >> >> Now if the question is to reuse the priority field, then we can do >> actually change the logic to accommodate priority =3D DAGRank(Rank) for = nodes >> that are not root, still ensuring that only a node that is already part = of >> a RPL DAG may be used as time source.**** >> >> Initially only the root would be priority 0. All the others would be >> default 255 (that is DAGRank(INFINITE_RANK) assuming MinHopRankIncrease = of >> 255)**** >> >> From there, all nodes that are one hop away from root with good RSSI can >> sync with the root, and listen to DIOs, and emit their own, and set thei= r >> own priority to DAGRank(Rank) that is < 255.**** >> >> Children sync to whichever prio < 255 neighbor as time source, listen to >> DIOs, select a parent, migrate to that parent as time source, and then c= an >> set their own priority to zero and send DIOs. If later they select a bet= ter >> parent the priority will get lower so that=92s till OK.**** >> >> Would that fly?**** >> >> b) about multiple DAGs, there are 2 cases:**** >> >> - 2 DODAGs in a same instance. We said we want to support that, and that >> implies that the various DODAGs are closely time sync=92d.**** >> >> - 2 DODAGs in 2 different instances. To be discussed. We have use cases >> where that could be useful, one instance playing basic slotted aloha and >> the other doing more critical jobs. **** >> >> **** >> >> We have not agreed on the latter but with a single radio, it seems >> problematic if the 2 instances do not share a same sense of time. We=92d= end >> up with slot frames that may drift from one another, sometimes overlappi= ng=85 >> I suspect that we=92d partition time inside a slot frame or using multip= le >> slot frames, but we=92d keep them in sync. Probably there is a need for = a >> spanning instance (0) for (autonomic) management etc=85 that uses someth= ing >> very simple, always on, very much like your basic draft. If there is suc= h a >> spanning instance, then it can be used to sync everyone, in which caseth= e >> Rank from the dependent instances is not used for time sync.**** >> >> What do others think?**** >> >> **** >> >> Pascal**** >> >> **** >> >> *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] >> *Sent:* jeudi 22 ao=FBt 2013 15:34 >> *To:* Pascal Thubert (pthubert) >> *Cc:* Thomas Watteyne; 6tsch@ietf.org >> *Subject:* Re: [6tsch] time parent selection based on EB priority**** >> >> **** >> >> Hi Pascal,**** >> >> **** >> >> my comment inline:**** >> >> **** >> >> [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to= do >> like an hop-count-based OF0.**** >> >> Q: Do we really need to build the time sync tree faster than the RPL >> graph?**** >> >> **** >> >> If no, maybe me could use the priority as a boolean to mean that the nod= e >> is already part of the RPL DAG and may be used as time source.**** >> >> Initially only the root would be priority 0. All the others would be >> default 1.**** >> >> From there, all nodes that are one hop away from root with good RSSI can >> sync with the root, and listen to DIOs, and emit their own, and set thei= r >> own priority to zero.**** >> >> Children sync to whichever prio 0 neighbor as time source, listen to >> DIOs, select a parent, migrate to that parent as time source, and then c= an >> set their own priority to zero and send DIOs.**** >> >> Would that fly?**** >> >> yes that would work but we are doing the same as the IEEE802-15.4e Join >> priority field is for. The 15.4e defines this mechanism and it is inhere= nt >> to the networks we address so using it is straightforward. Then as >> described by Thomas, we only need to use RPL best parent as soon as we h= ave >> one instead of the lowest prio neighbor. **** >> >> Another question with time sources is the selection of a time source >> parent in the case that a node belongs to more than one DODAG. Which par= ent >> is selected then? An more importantly, do the basic draft considers havi= ng >> more than one DODAG? **** >> >> thanks! >> Xavi**** >> >> **** >> >> On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pthubert) < >> pthubert@cisco.com> wrote:**** >> >> Dear all:**** >> >> **** >> >> As you know, RPL may entail temporary loops, in particular if >> DAGMaxRankIncrease is not configured to 0.**** >> >> If as we expect we use the RPL preferred parent tree for time sync, this >> will lead to time sync loops. **** >> >> Two questions here:**** >> >> 1) how bad is the effect of such loop? I expect that the clocks will >> derive rapidly, as if from the perspective of a node the crystal was rea= l, >> real bad.**** >> >> 2) can we detect that effect and use it to detect a loop in the routing?= * >> *** >> >> **** >> >> Please see inline:**** >> >> **** >> >> sch] time parent selection based on EB priority**** >> >> **** >> >> Qin, Xavi,**** >> >> **** >> >> Excellent point. I believe that this is exactly what makes this 6TSCH >> work so interesting: figuring out how consolidate the views between uppe= r >> and lower layers.**** >> >> **** >> >> In my mind, the join priority as you describe looks very much like a >> DAGrank. I believe there are, however, two potential questions we should >> not forget:**** >> >> - what if the joining mote does no get all of the EBs of its neighbor?**= * >> * >> >> - what happens when the topology changes and a node moves up or down in >> the DODAG?**** >> >> **** >> >> I would suggest the following:**** >> >> - once the node has fully joined, somehow tie the join priority to its >> RPL DAGrank. We might have to play with the metric to make the join >> priority look like a hop count, but I believe it is important the announ= ced >> join priority changes when the mote moves up/down in the topology.**** >> >> - maybe consider the time source parent identified during the joining as >> temporary until the final time source parent is discovered. How the fina= l >> one is discovered can through some command from the ME (see Qin's >> attachement), or after receiving many DIOs.**** >> >> **** >> >> [Pascal] Yes, I read Xavi=92s proposal as a mechanism parallel to RPL to= do >> like an hop-count-based OF0. **** >> >> Q: Do we really need to build the time sync tree faster than the RPL >> graph? **** >> >> **** >> >> If no, maybe me could use the priority as a boolean to mean that the nod= e >> is already part of the RPL DAG and may be used as time source.**** >> >> Initially only the root would be priority 0. All the others would be >> default 1.**** >> >> From there, all nodes that are one hop away from root with good RSSI can >> sync with the root, and listen to DIOs, and emit their own, and set thei= r >> own priority to zero.**** >> >> Children sync to whichever prio 0 neighbor as time source, listen to >> DIOs, select a parent, migrate to that parent as time source, and then c= an >> set their own priority to zero and send DIOs.**** >> >> Would that fly?**** >> >> Cheers,**** >> >> Pascal**** >> >> **** >> >> On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang wrote:*= * >> ** >> >> Agree!**** >> >> **** >> >> Qin**** >> >> **** >> >> On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote:**** >> >> HI Qin, >> >> as a basic setting we want the most basic approach. I guess that using >> (1) first priority and then RSSi will avoid having loops. As you say all >> this approaches would work but I bet for (1) to be the simplest. **** >> >> cheers! >> X**** >> >> **** >> >> On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang wrote:= * >> *** >> >> Hi Xavi,**** >> >> **** >> >> It is a good idea to use Priority in EB as a factor to choose initial >> time parent. But, I think there are several ways to use the Priority, an= d >> other metrics like RSSI. For example,**** >> >> **** >> >> (1) As you suggested, use Priority first, and then RSSI**** >> >> (2) or use RSSI first, and then Priority**** >> >> (3) or use a function of Priority and RSSI.**** >> >> **** >> >> I'm not sure which is better. What do you think?**** >> >> **** >> >> Qin**** >> >> **** >> >> **** >> >> On Thu, Aug 22, 2013 at 2:49 AM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote:**** >> >> Hi all, >> >> I want to propose to add in the basic TSCH draft the fact that when a >> node joins a network, it uses the EB join priority defined in the Slot a= nd >> Link IE (Section 5.2.4.13 15.4e std) to select its time parent. This >> priority is 0 for the PAN coordinator of the network. A node listening >> several EB selects as a time parent the node with lowest EB Join Priorit= y. >> In case of receiving multiple EBs with the same Join priority then filte= rs >> by other metrics e.g RSSI of the link. (note that until a DIO is receive= d >> nodes don not know about the gradient).**** >> >> A node when sends an EB uses the lowest EB Join priority it has heard an= d >> adds 1 to it as its own Join priority. >> >> >> Current draft section states that RSSI or another metric should be used >> to select the initial time parent, this has the problem that loops canno= t >> be avoided until the first DIO is received. With the proposed approach t= he >> problem is solved and does not introduce anything new, just used what 15= .4e >> provides to us.**** >> >> what is your opinion?**** >> >> thanks! >> Xavi**** >> >> **** >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> **** >> >> **** >> >> **** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> **** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> **** >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> **** >> >> ** ** >> > > --047d7b33c788a7874104e49e8d36 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Raghuram,
    Thanks for your explanation, your point is v= ery clear now. Let's discuss during the call.
    Thomas


    On Fri, Au= g 23, 2013 at 7:46 AM, Raghuram Sudhaakar (rsudhaak) <= rsudhaak@cisco.com<= /a>> wrote:
    Please see inline

    From: Thomas Watteyne <watteyne@eecs.berk= eley.edu>
    Date: Thursday, August 22, 2013 4:1= 0 PM
    To: "6tsch@ietf.org" <6tsch@ietf.org>
    Subject: Re: [6tsch] time parent se= lection based on EB priority

    All,

    Summarizing the different things we are talking about in this thread:<= /div>
    1. picking time source neighbors during the operation of the network. = Proposal is to use the (loop-free) RPL DAG. Challenged by Raghuram who want= s to have separate L2 and L3 behavior because of race conditions.
    2. picking time source neighbors during join process. Proposal is to a= ttach to the node which indicates the lowest join priority in EB. Question = is whether join priority reflects DAGrank or not.
    3. multiple DODAGs: keeping DAGroots sync'ed or participating in s= everal independent time bases.

    My opinion is:
    1. I believe keeping the same DAG structure the same between L2 and L3= makes sense. If there is no L2 connectivity, L3 cannot function since it c= an not speak to and hear the neighbors, so I'm afraid I don't quite= follow the race condition issue.
    =A0I support the idea of keeping th= e same DAG structure between L2 and L3.=A0

    To explain what I was referring to = -
    The RPL trickle timer period can very easily b= ecome a large value if the network is static. In this time if a node does s= witch off, it is most like that L2 will detect it first since it would have= received EB from its current parent. Now if we force it that the RPL parent has to = be the timing parent we cannot find a timing parent until L3 detects the to= pology change. If we allow L2 to initiate a join process and choose a new t= iming parent and inform L3 we may be violating the RPL OF. This is the situation that I was referring to. I = feel that there is a fair probability of this happening. Thoughts ?<= /div>

    To address this we probably need to allow RPL = to change the topology based on the OF, after L2 join has occurred. Then L2= can change its timing parent to be synced with DAG structure.=A0

    2. My inclination is to have the join priority be an indication of the= DAGrank, possible by "rounding off". When joining, a new node wi= ll join L2 (i.e. synchronize) as soon as it hears EBs, then join L3 (i.e, a= cquire a DAGrank) after hearing DIOs. I would have the node transmit EBs only after that last step.

    3. My opinion is that, for now, we should take the multiple root case = into account, but only if they are synchronized through some out-of-band me= chanism.


    Raw opinions, up for discussion :)

    Thomas

    On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert= (pthubert) <pthubert@cisco.com> wrote:

    Dear Qin:

    =A0

    I think the idea was to make sure that the r= oots are synchronized.

    Certainly the DODAGs may be a bit out of syn= c as we progress down, but we expect that the guard time is sufficient.<= /u>

    The alternate would be to sync the whole net= work completely independent of RPL DAGs etc=85 eg using a GPS.

    There might be use cases where that is fine,= but we need to document a default behavior that does not make the assumpti= on of a GPS or similar.

    =A0

    Makes sense?

    =A0

    Cheers,

    =A0

    Pascal

    =A0

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 19:03


    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Pascal,

    =A0

    It may bring in some complexity. Think about the cas= e. DODAG1 and DODAG2 are in a same instance, but have no shared nodes, thus= may not be able sync with each other. =A0A new node (node-A) comes in, wan= ts to join into the two DODAGs, in another word, want to jump between the two DODAGs. =A0I believe node-A has to chan= ge its time source parent and re-sync when it jump from one DODAG to anothe= r. Right?

    =A0

    Thank

    Qin

    =A0

    =A0

    =A0

    =A0

    On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    I do not think so, Qin;

    =A0

    but it is required that a node on one DODAG = may jump onto the other, and to do that, it is useful to monitoring candida= tes from both dodags.

    Note that DODAGs partition the network, and = all the parents must be in one of them.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 17:54
    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi Pascal,

    =A0

    Is it assumed that 2 DODAG in a same instance must h= ave at least one shared node?

    =A0

    Thanks

    Qin

    =A0

    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:

    =A0

    The problem is that we have 2 mechanisms tha= t establish a distance to the root in order to avoid loops, RPL Rank and 4e= priority.

    Fact is, RPL is probably more elaborate for = loop detection and loop avoidance. I suspect that the priority can easily c= ount to infinity.

    So I=92d trust RPL Rank rather than priority= , and we seem to agree that we want to time sync with RPL parents.

    =A0

    a) My question is whether it makes sense and= value to have a transition between a time source based on best (hop count)= priority and to one based on best RPL Rank, or if we could use the rank right away. Seems to me that= life would be easier if we use the Rank right away, though it may make the= network a bit slower to come up. Passing from one mode to the other will d= emand some specifications, what if one node reboots and goes from one mode to the other, etc=85<= /u>

    =A0

    Now if the question is to reuse the priority= field, then we can do actually change the logic to accommodate priority = =3D DAGRank(Rank) for nodes that are not root, still ensuring that only a node that is already part of a RP= L DAG may be used as time source.

    Initially only the root would be priority 0.= All the others would be default 255 (that is DAGRank(INFINITE_RANK) assumi= ng MinHopRankIncrease of 255)

    From there, all nodes that are one hop away = from root with good RSSI can sync with the root, and listen to DIOs, and em= it their own, and set their own priority to DAGRank(Rank) that is < 255.

    Children sync to whichever prio < 255 nei= ghbor as time source, listen to DIOs, select a parent, migrate to that pare= nt as time source, and then can set their own priority to zero and send DIOs. If later they select a bette= r parent the priority will get lower so that=92s till OK.<= /u>

    Would that fl= y?

    b) about multiple DAGs, there are 2 cases:

    - 2 DODAGs in a same instance. We said we wa= nt to support that, and that implies that the various DODAGs are closely ti= me sync=92d.

    - 2 DODAGs in 2 different instances. To be d= iscussed. We have use cases where that could be useful, one instance playin= g basic slotted aloha and the other doing more critical jobs.

    =A0

    We have not agreed on the latter but with a = single radio, it seems problematic if the 2 instances do not share a same s= ense of time. We=92d end up with slot frames that may drift from one another, sometimes overlapping=85= I suspect that we=92d partition time inside a slot frame or using multiple= slot frames, but we=92d keep them in sync. Probably there is a need for a = spanning instance (0) for (autonomic) management etc=85 that uses something very simple, always on, very much li= ke your basic draft. If there is such a spanning instance, then it can be u= sed to sync everyone, in which casethe Rank from the dependent instances is= not used for time sync.

    What do others think?

    =A0

    Pascal

    =A0

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

    =A0

    Hi Pascal,

    =A0

    my comment inline:

    =A0

    [Pascal] Yes, I read Xavi=92s proposal as a = mechanism parallel to RPL to do like an hop-count-based OF0.<= u>

    Q: Do we really need to build the time sync = tree faster than the RPL graph?

    =A0

    If no, maybe me could use the priority as a = boolean to mean that the node is already part of the RPL DAG and may be use= d as time source.

    Initially only the root would be priority 0.= All the others would be default 1.

    From there, all nodes that are one hop away = from root with good RSSI can sync with the root, and listen to DIOs, and em= it their own, and set their own priority to zero.

    Children sync to whichever prio 0 neighbor a= s time source, listen to DIOs, select a parent, migrate to that parent as t= ime source, and then can set their own priority to zero and send DIOs.

    Would that fl= y?

    yes that would work but we are doing the same as = the IEEE802-15.4e Join priority field is for. The 15.4e defines this mechan= ism and it is inherent to the networks we address so using it is straightforward. Then as described by Thomas, we= only need to use RPL best parent as soon as we have one instead of the low= est prio neighbor.=A0

    Another question with time sources is the selecti= on of a time source parent in the case that a node belongs to more than one= DODAG. Which parent is selected then? An more importantly, do the basic draft considers having more than one DOD= AG?=A0

    thanks!
    Xavi

    =A0

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pth= ubert) <pthubert= @cisco.com> wrote:

    Dear all:

    =A0

    As you know, RPL may entail temporary loops,= in particular if DAGMaxRankIncrease is not configured to 0.<= u>

    If as we expect we use the RPL preferred par= ent tree for time sync, this will lead to time sync loops.

    Two questions here:

    1) how bad is the effect of such loop? I exp= ect that the clocks=A0 will derive rapidly, as if from the perspective of a= node the crystal was real, real bad.

    2) can we detect that effect and use it to d= etect a loop in the routing?

    =A0

    Please see inline:

    =A0

    sch] time parent selection based on EB priority

    =A0

    Qin, Xavi,

    =A0

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

    =A0

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

    =A0

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important t= he announced join priority changes when the mote moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME = (see Qin's attachement), or after receiving many DIOs.

    =A0

    [Pascal] Yes, I read Xavi=92s proposal as a = mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the time sync = tree faster than the RPL graph?

    =A0

    If no, maybe me could use the priority as a = boolean to mean that the node is already part of the RPL DAG and may be use= d as time source.

    Initially only the root would be priority 0.= All the others would be default 1.

    From there, all nodes that are one hop away = from root with good RSSI can sync with the root, and listen to DIOs, and em= it their own, and set their own priority to zero.

    Children sync to whichever prio 0 neighbor a= s time source, listen to DIOs, select a parent, migrate to that parent as t= ime source, and then can set their own priority to zero and send DIOs.

    Would that fl= y?

    Cheers,

    Pascal=

    =A0=

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

    =A0

    Qin

    =A0

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

    =A0

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

    =A0

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

    =A0

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

    =A0

    I'm not sure which is better. What do you think?=

    =A0

    Qin

    =A0

    =A0

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

    =A0

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    --047d7b33c788a7874104e49e8d36-- From ksjp@berkeley.edu Fri Aug 23 08:49:28 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 43DD611E81AF for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 08:49:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vrvrNHR9xndO for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 08:49:12 -0700 (PDT) Received: from mail-pd0-f180.google.com (mail-pd0-f180.google.com [209.85.192.180]) by ietfa.amsl.com (Postfix) with ESMTP id C2CAF11E80FB for <6tsch@ietf.org>; Fri, 23 Aug 2013 08:49:12 -0700 (PDT) Received: by mail-pd0-f180.google.com with SMTP id y10so814843pdj.39 for <6tsch@ietf.org>; Fri, 23 Aug 2013 08:49:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :cc:subject:references:in-reply-to:content-type :content-transfer-encoding; bh=51HLy8kekfCFWrLztsh+fsu6sWVAI6jSJMecu/Wx3R4=; b=UAZlhLcQ0zA4x4Q4xtTJioj7gfS2o3aCBgujxWdTMUzys0nWX9tfiyEhX8oaN1eUOS JmAQjj63x+WlBkCaid+1UuHj0Luvy4Rs6grLEJ2QPKkSCW61jVbqaKZnSeAVY8hMojUr Wf+YdnM5hlCXJGw6DoD1FehksRmrPih9qRVt+YoWrQk+yZqKHNrozFyEzzW3VoPyA/eQ 9qlQhJhwNrkDBgoZLO/q4SSghguA6Jx07mZw4VrI6of92KA6DuJd7vHDBcck5YFM8f6Q 3UARKTAHtdOY87ay7i2gYWQT+l5uIRyo3+/Ebik2tQ6w3NWdoyY2DPnulblwUOz4xJHU cacQ== X-Gm-Message-State: ALoCoQmhl+fp/TG3qlxzcseDZG1wGbg5DBp8l451C+BlpGqd8wxLc5RtY37do4kMpH/6uJLUBOet X-Received: by 10.66.163.164 with SMTP id yj4mr11982402pab.91.1377272952463; Fri, 23 Aug 2013 08:49:12 -0700 (PDT) Received: from [192.168.1.104] (c-98-210-49-50.hsd1.ca.comcast.net. [98.210.49.50]) by mx.google.com with ESMTPSA id xe9sm516736pbc.21.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 23 Aug 2013 08:49:12 -0700 (PDT) Message-ID: <52178470.50309@berkeley.edu> Date: Fri, 23 Aug 2013 08:49:04 -0700 From: Kris Pister User-Agent: Mozilla/5.0 (Windows NT 6.0; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: Giuseppe References: <5215eb9f.e2c6b40a.6b2c.ffffe7e1@mx.google.com> <5216A2A1.3080602@berkeley.edu> <5216B1F4.8090504@gmail.com> In-Reply-To: <5216B1F4.8090504@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: '6TSCH' <6tsch@ietf.org>, Alfredo Grieco , 'Elvis Vogli' , 'Gennaro Boggia' Subject: Re: [6tsch] Synchronization Issues X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 15:49:28 -0000 +1 (assuming you meant slot_num not superframe_num) ksjp On 8/22/2013 5:51 PM, Giuseppe wrote: > while scheduling beacons with the couple (superframe_num, channel_num) > should avoid the collisions in this case and improve the > synchronization phase From xvilajosana@berkeley.edu Fri Aug 23 09:09:33 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A1E6111E8170 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 09:09:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[AWL=0.378, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Nvx8bkIoUi7t for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 09:09:29 -0700 (PDT) Received: from mail-pa0-f45.google.com (mail-pa0-f45.google.com [209.85.220.45]) by ietfa.amsl.com (Postfix) with ESMTP id 6E1CC11E81B7 for <6tsch@ietf.org>; Fri, 23 Aug 2013 09:09:29 -0700 (PDT) Received: by mail-pa0-f45.google.com with SMTP id bg4so842490pad.18 for <6tsch@ietf.org>; Fri, 23 Aug 2013 09:09:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:date:message-id:subject :from:to:content-type; bh=fTiyUDsSWIwqnBjn3nZige88BtTymIMXbQxGgILYsMk=; b=Dvfq/VHtSnGjfwonLhYA4gE08s/hbQrb3m0NAF44nA7WHA0Y/bZWzFS1rtdb7A8pfl pabvwVpNW0IKLl6AsByOsifAIZdWc1WRXsBT67S92yB8Pd9lPGOm5nvoXihaF2Qumigd 8ty2yYTD0gKWFpYGRd2JFDFmAquy7X3GY0sRQZi2HBmD1blTBfOdTnkfwtpS3e+PeRoY 4ptIx7CA5b0UBt0I1vWijefQJ5Zl5yrhkjfH+ID+RQ/lVHCNtRvS6BlJOFj7Ht2prHJZ dPVWQur1VUb0bx19qgEH+7kTMjSO7/sLqBn/FKtINnMLG0zNacQDOI1DBBztQFObxT2y xP/g== X-Gm-Message-State: ALoCoQmG8c2NLQ0sXJh7olU5AH3QJ9AZVP06tlSS2+5nlnsbIhedEgeKLJZRbqjCF2LlWzOjkkjH MIME-Version: 1.0 X-Received: by 10.67.4.227 with SMTP id ch3mr21986965pad.74.1377274169041; Fri, 23 Aug 2013 09:09:29 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Fri, 23 Aug 2013 09:09:29 -0700 (PDT) Date: Fri, 23 Aug 2013 09:09:29 -0700 Message-ID: From: Xavier Vilajosana Guillen To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b16018d9acaa604e49fa142 Subject: [6tsch] differences on basic draft X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 16:09:33 -0000 --047d7b16018d9acaa604e49fa142 Content-Type: text/plain; charset=ISO-8859-1 Hi all, here the differences https://bitbucket.org/6tsch/draft-vilajosana-6tsch-basic/diff/draft-vilajosana-6tsch-basic-02.txt?diff1=21207998403b&diff2=e48e8c7bfde6c7f3f000ca84dae62b2920b14a7a&at=master cheers, Xavi --047d7b16018d9acaa604e49fa142 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable --047d7b16018d9acaa604e49fa142-- From qinwang@berkeley.edu Fri Aug 23 09:14:55 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8826511E8170 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 09:14:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.901 X-Spam-Level: X-Spam-Status: No, score=-2.901 tagged_above=-999 required=5 tests=[AWL=0.075, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jzJybjGiCyI8 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 09:14:50 -0700 (PDT) Received: from mail-ve0-f173.google.com (mail-ve0-f173.google.com [209.85.128.173]) by ietfa.amsl.com (Postfix) with ESMTP id EAD3911E8103 for <6tsch@ietf.org>; Fri, 23 Aug 2013 09:14:49 -0700 (PDT) Received: by mail-ve0-f173.google.com with SMTP id cy12so576012veb.18 for <6tsch@ietf.org>; Fri, 23 Aug 2013 09:14:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=mnCiBd0ClRWmOYzRYKgCpmDrdv5OFmMRbjbOfhR/VQE=; b=iGDX/4uiie+3gi3KTsJR1wEMuLl/mlHxSsJMddDpMXku9GCjBNrGz6o8oIW1Eu/cRW hEzli/keE6MHzJk4PMl+3Ps+5JwINI631nwtnJyAtvYBt+4aMSTj9GBxa47XGihSidDf OP0AUTriBK9/XvNy5Fb2aYq0bSS5fwzyqykilPet0YsEXOTLUqaff5Sm8niDTNYVCBU3 hl5O3rk4xK28asCo8WQ5Xtc9E0Zqxf7+dCd8ngRiyResmcNGxfbIXDPJODyyBkbSoOax sd5l2K3/PVYVA5+U125u9RAqAvMePlf2L8GD5LK2fj8D5zqkthOPunEFkwyTw4/DjRg3 6Q9w== X-Gm-Message-State: ALoCoQnOzcc8KNdBzhH72YXCskxXhwDg/Y8iZVCWittQwAzgZe5ThSMXHgCquOv7h1Ua6GgNX+kG MIME-Version: 1.0 X-Received: by 10.52.165.45 with SMTP id yv13mr184370vdb.1.1377274488330; Fri, 23 Aug 2013 09:14:48 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Fri, 23 Aug 2013 09:14:48 -0700 (PDT) Date: Sat, 24 Aug 2013 00:14:48 +0800 Message-ID: From: Qin Wang To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/mixed; boundary=001a11c20802a2aca804e49fb4d5 Subject: [6tsch] content of control flows X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 16:14:56 -0000 --001a11c20802a2aca804e49fb4d5 Content-Type: multipart/alternative; boundary=001a11c20802a2aca504e49fb4d3 --001a11c20802a2aca504e49fb4d3 Content-Type: text/plain; charset=ISO-8859-1 Hi all, The attached file is about the content of control flows between ME and 6top. There are lots of TODO in it. Please input your idea. Thanks Qin --001a11c20802a2aca504e49fb4d3 Content-Type: text/html; charset=ISO-8859-1
    Hi all,

    The attached file is about the content of control flows between ME and 6top. There are lots of TODO in it. Please input your idea.

    Thanks
    Qin
    --001a11c20802a2aca504e49fb4d3-- --001a11c20802a2aca804e49fb4d5 Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document; name="content of control flows.docx" Content-Disposition: attachment; filename="content of control flows.docx" Content-Transfer-Encoding: base64 X-Attachment-Id: f_hkpllvjf0 UEsDBBQABgAIAAAAIQAJJIeCgQEAAI4FAAATAAgCW0NvbnRlbnRfVHlwZXNdLnhtbCCiBAIooAAC AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 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FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id REZaHA2p4+2H for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 09:23:53 -0700 (PDT) Received: from mail-pb0-x229.google.com (mail-pb0-x229.google.com [IPv6:2607:f8b0:400e:c01::229]) by ietfa.amsl.com (Postfix) with ESMTP id A798B11E8103 for <6tsch@ietf.org>; Fri, 23 Aug 2013 09:23:53 -0700 (PDT) Received: by mail-pb0-f41.google.com with SMTP id rp2so866693pbb.0 for <6tsch@ietf.org>; Fri, 23 Aug 2013 09:23:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=swdkSAPPBDxP0VE8DBYjPTkTdKiHvgU5uqAak416dEs=; b=g18JH3EeO7lTr7fuMVXv0OEO3rosIm50F8Ef3mObNPUHN0iG4KoiEWsyhHPdxL4pwI HEXjAdBred/uPZDBp95QPfwdPCmvBOFizVklXtf4aUb4pT/QVkAG+TzFoilRbFxkdHZ6 JLVmRwPUXDDO3wK/cOxyfuiY6pHi2TIR422LMMiGoj3hpsETzkxRUpFpDyi/UZIHe05X ugtsqLiU97ggmFBAoRVTtLLOzx9nqJ6i7vyIWXvVCBCfQSijeuUEOT/PwIGBqEfz2SZ1 JLI0nEqCICcJRh/SD5M2pxxj9Qn3tQI9iGhiUewsYi9VCR9gTIchZH8/2WjsW3Pw8b1D MBYA== X-Received: by 10.66.219.41 with SMTP id pl9mr2440036pac.187.1377275033412; Fri, 23 Aug 2013 09:23:53 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 23 Aug 2013 09:23:33 -0700 (PDT) From: Thomas Watteyne Date: Fri, 23 Aug 2013 09:23:33 -0700 X-Google-Sender-Auth: 52zT12dQht5GiTK6s8vd_uSLLWc Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b5da81f1feacc04e49fd561 Subject: [6tsch] minutes BoF: last call for approval X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 16:23:54 -0000 --047d7b5da81f1feacc04e49fd561 Content-Type: text/plain; charset=ISO-8859-1 All, The latest version of the BoF minutes are at: https://bitbucket.org/6tsch/meetings/wiki/130730b_ietf-87_berlin_bof Please let me know *in the next 24h* if you have final modifications you'd like to make. In the absence of issues raised, I will submit them to the IETF 87 Materials Management Tool. Thomas --047d7b5da81f1feacc04e49fd561 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    The latest version of the BoF minu= tes are at:

    Please let me know in the next 24h=A0if yo= u have final modifications you'd like to make.

    In the absence of issues raised, I will submit them to the IETF 87 Materia= ls Management Tool.

    Thomas
    --047d7b5da81f1feacc04e49fd561-- From twatteyne@gmail.com Fri Aug 23 09:55:11 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1EB2111E81B3 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 09:55:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.838 X-Spam-Level: X-Spam-Status: No, score=-1.838 tagged_above=-999 required=5 tests=[AWL=0.139, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ST1Vh--4NPcf for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 09:55:08 -0700 (PDT) Received: from mail-pd0-x229.google.com (mail-pd0-x229.google.com [IPv6:2607:f8b0:400e:c02::229]) by ietfa.amsl.com (Postfix) with ESMTP id 6B10711E8170 for <6tsch@ietf.org>; Fri, 23 Aug 2013 09:55:06 -0700 (PDT) Received: by mail-pd0-f169.google.com with SMTP id r10so906728pdi.28 for <6tsch@ietf.org>; Fri, 23 Aug 2013 09:54:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=H1Thn3hAgx2eFNhkvXFzPZEzy3bbn7vNTjXKR+0rKtY=; b=y/Uahk24X6A29xp3hbJOcvsoTSCTWT6jAmHTQ2IYrE2GmbirkRuC7PawHaixDUNIqW pyWbN0mKVOTYx2jBM8lCw8y52ra58vS+vy44NOW17mc9OnEuRJLiDIMwoY3GYylMqAIC UAOS/izjPjLYox08pOxoQ76nWN/7Js2qHxmXRbOqt10kLE2H9PHhGGW1I2PiZbD6fucY AwTsWS+VcGFeHWMezQFcfpthg1MT+Nu5TPMj7qwEwxFh7B5XZ/EA6eBlJqNpmah6e19e GTmBxSS7ygpAA/mTrO53qG4TuuxypZHah1E9I5e4jtOGt6Ero5PDkZCUa7T0/4u/MO7S OcMw== X-Received: by 10.68.254.42 with SMTP id af10mr593448pbd.154.1377276897527; Fri, 23 Aug 2013 09:54:57 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 23 Aug 2013 09:54:37 -0700 (PDT) From: Thomas Watteyne Date: Fri, 23 Aug 2013 09:54:37 -0700 X-Google-Sender-Auth: SoF21BOJ7uIzk6qz-pyq58KF1qI Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b2e0d833c117d04e4a04478 Subject: [6tsch] minutes webex 23 August 2013 X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 16:55:11 -0000 --047d7b2e0d833c117d04e4a04478 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable All, You will find the minutes of today's webex below. FYI, all the minutes and slides are archived a https://bitbucket.org/6tsch/meetings/. Thanks to Xavi and Dominique for taking notes! As usual, fix anything we might have missed directly in the e-mail and reply. We will approve and adopt the minutes at the next call. Thomas ----- Minutes Webex 23 August 2013, 6TSCH group Note: timestamps in PDT. Taking notes *(using Etherpad)* 1. Xavi Vilajosana 2. Dominique Barthel 3. Thomas Watteyne Present *(alphabetically)* 1. Carsten Bormann 2. Diego Dujovne 3. Dominique Barthel 4. Elvis Vogli 5. Kuor Hsin Chang 6. Maria Rita Palattella 7. Pascal Thubert 8. Pouria Zand 9. Qin Wang 10. Raghuram Sudhaakar 11. Thomas Watteyne 12. Tom Phinney 13. Xavi Vilajosana Recording - Webex recording (audio+slides,streaming) - https://cisco.webex.com/ciscosales/lsr.php?AT=3Dpb&SP=3DMC&rID= =3D70878327&rKey=3D1c9d0a1ca023e353 *[66min]* Slides - slides_130823_webex.ppt: slides shared during the call Agenda - Administrivia *[2min]* - CBOR *[10min]* - Identifying the flows *[10min]* - Update "Basic" Draft *[10min]* - Time parent selection and EB priority *[20min]* - renaming 6TSCH *[5min]* - This Coming Week *[2min]* - AOB *[1min]* Minutes - *[08.02]* Meeting starts - *[08.02]* Administrivia - Carsten is joining us to give an overview of CBOR. Thanks! - Overview of the agenda - Approval of the BoF Minutes No issues raised. Action item: Thomas to send final call for approval on ML. Action item: Thomas to upload final minutes onto meeting mater= ials website. - Approval minutes webex 08/09 No issues raised. Minutes approved. - Slides during the call can be accessed on Bitbucket before the call, or by flipping through slides shared in webex. - IETF 88 Vancouver: - Registration opens today - Don't wait too long to book hotel - IETF 88 is in 71 days - *[08.08]* CBOR *[Carsten Bormann]* - CBOR: Concise Binary Object Representation - Design and Overview. - Available at http://tools.ietf.org/html/draft-bormann-cbor-06 - Why a new binary format? --> different design, not all formats are useful for all protocols: - Simple format, can be implemented in small amount of code - Encoded data is compact - No compression or even fiddling. Not as compact as using compression, but the amount of code used to produce the format is = very small. - JSON-like format. - no schema required. -- schema-less - compact implementation - applicable to constrained nodes and high volume applications - supports all JSON data types. - extensible. - What does it look like? - Initial byte: - major type (3bits) and additional information (5bytes) - 8 major types: bool, int, etc. - CBOR vs FOO (e.g. Binary JSON) - See http://tools.ietf.org/html/draft-bormann-cbor-06#appendix-E.= 6 - More compact representation by CBOR than ASN.1 or BSON - Stream format is used when there is no knowledge about the length of the object. - Questions - *[Pascal]* Usage of CBOR? Are there any standards already using it? - *[Carsten]* Several standard are looking for applicability. Early stage though - *[Thomas]* Can CBOR encode all JSON type? I.e. can we design using JSON, knowing tha CBOR could encode it? - *[Carsten]* Yes. Do not talk about compression, rather encoding. - *[Thomas]* Is there a aeb based application which can be used to test encoding of different JSON strings for initial testing? - *[Carsten]* People have implemented it in an afternoon. I have a robust implementation I can push out if needed. - *[Thomas]* Status? - *[Carsten]* In final steps. At the IESG now. - *[08.22]* Identifying the flows *[Pouria Zand, Qin Wang]* - Discussion about identifying the flows: - Centralized vs distributed system manager architecture concept - "ME" is the management entity. Can be an upper layer (distributed scheduling) or a PCE (centralized scheduling). - 3 control flows: - ME <-> 6top: ME can be in PCE or in upper layer - 6top <-> TSCH - 6top <-> 6top: message flows between 6top of node A and 6top of node B - Control flows: - action flows: Action request - confirmation.. - query flows: - Report flows: - example of interaction between node A and B to schedule a soft cell between them, at the initiative of node A's higher layer. - example of interaction for creating a hard cell: - Create a link between 2 nodes managed by the PCE. - safer to have PCE send two separate request to A and B to create a hard cell (as opposed to having A pass on the request to B) - *[Pascal]* in the future (after rechartering), we could have a train of requests in RSVP-like fashion. - *[Thomas]* we have to make sure the format agreed upon now can be reused in the future. - *[Maria Rita]* The PCE should know that a link between A and B exists when it instructs to allocate a cell from A to B. - *[Qin]* three message interfaces: ME-6top, 6top-TSCH, 6top-6top, this work focus on ME-6top first. - *[Thomas]* Let's come up with an actual description of the contents of the packet, and come again to this question in the future. - How to figure out the Contents of the Control Flow: - Select what format and content is necessary. - Bottom up approach: from 6top to upper layers - Top down approach: from ME to 6top - Bottom up investigation: - Content of Action Flow (see slides) - Content Query Flow: - not define, needs to work from top down approach. - *[Qin]* It is unclear at this stage which slots to use to transport the report flow. - *[Thomas]* In the context of the basic draft, this question is already answered. - *[Pascal]* Add more information about tracks? More commands specific for managing tracks? - *[Thomas]* Installing a mapping between cells and tracks used to be part of the list of type? - *[Qin]* List on slides are truncated Action item: Qin to send the document with full list to the ML. - *[Thomas]* When a mote wants to send more data, it has to contact the ME and request more links. Is that mapped in that commands? - *[Qin]* Centralized case: The PCE configures the motes on how to report alarms. The PCE can configure the track that should be used to request more bandwidth. - *[Thomas]* How does a mote let the PCE know that it is going to send data to a new destination which is not in an existing t= rack? - *[Qin]* We need to define how a request for a new track or more bandwidth flows to the PCE. - *[Qin]* Application needs to talk to ME. Action Item: Take this discussion in the ML. - Top down investigation: - RPL rank is needed, rank should be an attribute of the neighbour table. - Need input from someone familiar with PCE. - *[Thomas]* Does this impact the format of the packets? - *[Qin]* We need to know the message requirements from the PCE= . - *[Pascal]* RPL and PCE can install routes. The management entity has requirements that we need to identify, the top down approach has to show that. The flows of information in the forwarding plane. Action Item: Qin request people to join her discussion and define what the information is needed form a top down approach point. - *[08.50]* Update "Basic" Draft *[Xavi Vilajosana]* - Build gradient on join priorities, by adversing +1 on best join priority heard. - TO be used before we have a RPL DODAG in place. - Proposes to use the "zero" RPL Objective Function. - One preferred parent and one alternate. - Non-storing mode as a MUST implement. - Explains rank computation as defined in "zero" OF. - Use of ETX metric to compute rank increase. - *[Pascal]* normalized to predefined limits. 1 to 9. For example, assume ETX of a fairly good radio link being 1.2, the rank increment can be set to 0.4 such that this ETX is represented by 3. - *[09.02]* Time parent selection and EB priority > We are running out of time. This discussed is moved to next week. - *[09.02]* Renaming 6TSCH - Thomas announces current ranking of votes on the mailing list. - Will publish on the mailing list. - Of the proposed new names, none raised concerned with IESG. - *[09.04]* This Coming Week - ETX implementation according to RFC6551 and RFC6552 - Private discussion, OpenWSN implementation - Lead: Xavi Vilajosana - Synchronization and Clock accuracy - See ML thread: =93RPL on Basic=94 - Lead: Pouria Zand - Fast join - See ML thread: =93Synchronization Issues=94 - Lead: Alfredo Grieco - JSON, BSON, CBOR comparison - Private discussion - Lead: Qin Wang - Take a stab at packet format - Lead: ? - Discussion Time parent selection and EB priority - Lead: ? - *[09.07]* AOB No other business from the attendance. - *[09.08]* Meeting ends --047d7b2e0d833c117d04e4a04478 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    All,

    You will find the minut= es of today's webex below.

    FYI, all the minute= s and slides are archived a https://bitbucket.org/6tsch/meetings/.

    Thanks to Xavi and Dominique for taking notes!

    As usual, fix anything we might have missed directly in th= e e-mail and reply. We will approve and adopt the minutes at the next call.=

    Thomas

    -----


    On Thu, Aug 29, 2013 at 5:00 PM, Maria Rita PALATTELLA <m= aria-rita.palattella@uni.lu> wrote:

    All, going back to the de= finition of the 4 control flows, I tried to fill some of the TODO rows of t= he tables that Qin created so far.

    =A0<= /p>

    An updated version of the= se tables is attached. I left also some comments for discussing on.<= u>

    Any comment is welcome.

    =A0<= /p>

    Maria Rita<= /span>

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: Thursday, August 29, 2013 12:27 AM
    To: Qin Wang
    Cc: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] the 4th control flow

    =A0

    Hi, I also agree with the 4 message flows.

    <= div class=3D"h5">
    as regards to Confirmation, this would introduce end-to-end confirmation at= L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an = optional feature?


    X

    =A0

    On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

    =A0

    I agree to the 4 control flows. One more question fo= r the two node->ME flows: Is a Confirmation from ME to node needed?

    =A0

    Thanks

    Qin

    =A0

    On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    All,

    =A0

    If possible, let's keep things simple and stick = closely to the charter, certainly for now.

    =A0

    I would like to propose the following assumptions:

    • let's assume signaling and data packets are independent.
      IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking.
    • let's consider the steps highlighted in the charter, for now:=
      • draft-vilajosana-6tsch-basic gives us a network with minimal connectivity b= etween all nodes in the network. Most of the schedule is empty, available o= t some dynamic scheduler.
      • the scheduler uses the minimal connectivity to communicate, either between = neighbors (distributed), or between nodes and the PCE (centralized)<= u>

    If we agree with this, I propose we go back to discu= ssing the types of flows, per the name of this thread. I'd like to call= on a rough consensus for the following 4 flows:

    • ME->node
      • action
      • query
    • node->ME
      • report
      • event

    Thomas

    =A0

    =A0

    On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

    =A0

    I agree to keep different alternatives, at lease as = options.

    =A0

    Regarding to what kinds of cells should be used for = conveying the report, shared cells or dedicated cells, I would like to leav= e them to configuration. What do you think?

    =A0

    Thanks

    Qin

    =A0

    =A0

    On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    Qin,

    =A0

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in = the network, there will always need to be some cells installed for infrequent signaling traffic. If the report= rate is very slow, it might qualify as "infrequent signaling traffic&= quot;. For sure, the request to change the schedule qualifies.

    =A0

    Isn't the answer=A0draft-vilajosana-6tsch-basic?= That is, the slotted Aloha schedule indicated in the draft can be used for= the signaling traffic between the nodes and the ME. Of course, if the repo= rt rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not thi= s early on.

    =A0

    I agree with Diego that keeping the solution open to= different alternative is key.

    =A0

    Thomas

    =A0

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
    =A0 =A0 =A0 Alternative (1) adds delay to define the slots to send the even= t
    to the ME (propagate the new schedule),
    while alternative (2) =A0keeps reserved slots waiting for the event to happ= en.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driv= en report
    > is. I think we don't want to assume 6top sublayer is very intellig= ent, in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is =A0when and how the bandwidt= h for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control fl= ows between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (= 510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125=

    _______________________________________________
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    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
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    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    --047d7bd6c2c44eb1c504e5171768-- From pthubert@cisco.com Thu Aug 29 08:15:55 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A519821F9A70 for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 08:15:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.504 X-Spam-Level: X-Spam-Status: No, score=-10.504 tagged_above=-999 required=5 tests=[AWL=0.094, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sYlNqurplbQP for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 08:15:50 -0700 (PDT) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id EF0FF21F8846 for <6tsch@ietf.org>; Thu, 29 Aug 2013 08:15:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=57938; q=dns/txt; s=iport; t=1377789343; x=1378998943; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=K27kJoEDuI/u0ECKD45eO8meKHS0tTwcSl1j+opqpv0=; b=buKrpjBdNpYaUsdh6rvpdbYJ63F5cR/pc191wtcft6p5+9sDcuDCUWOe FCozgbzN1WztRgkLYFNTQSnmuvEncXrXRz8RjiGqC81AuTd0AqZNndPbi wZQsya7QQD4pOUNIAEljmLrqWTgxTFesub7rrVWkGjmS6lPJbbCnF49bd I=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AkcFAFZkH1KtJV2Y/2dsb2JhbABXAw6CNUQ1UcA3gScWdIIkAQEBAwEBAQEXDQYcJQsFCwIBCBEEAQEBChYBBgcnCxQJCAIEAQ0FCBOHYAYMuTCOKhGBCCELAQEDBgEGAwiDC4EAA4VKgzKgXYJhP4FxOQ X-IronPort-AV: E=Sophos;i="4.89,984,1367971200"; d="scan'208,217";a="253162278" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by rcdn-iport-2.cisco.com with ESMTP; 29 Aug 2013 15:15:41 +0000 Received: from xhc-aln-x06.cisco.com (xhc-aln-x06.cisco.com [173.36.12.80]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id r7TFFfj1002548 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 29 Aug 2013 15:15:41 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-aln-x06.cisco.com ([173.36.12.80]) with mapi id 14.02.0318.004; Thu, 29 Aug 2013 10:15:40 -0500 From: "Pascal Thubert (pthubert)" To: Qin Wang , Maria Rita PALATTELLA Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOpMW9JOdqNz01RYqfaTSvull3F5msSnVA Date: Thu, 29 Aug 2013 15:15:39 +0000 Deferred-Delivery: Thu, 29 Aug 2013 15:15:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.49.80.28] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD84143072Dxmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 15:15:55 -0000 --_000_E045AECD98228444A58C61C200AE1BD84143072Dxmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Qin: I'm with you that the reports and events are initiated by the device. Then there is the flow that we discussed at the call last week and that tri= ggered this thread. The use case is a new control loop for which a sensor d= evice talks to the controller (the PCE) to request the establishment of a p= ath between self and an actuator. I imagined that this was considered an event. But maybe not? Pascal From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Q= in Wang Sent: jeudi 29 ao=FBt 2013 16:41 To: Maria Rita PALATTELLA Cc: Thomas Watteyne; 6tsch@ietf.org; xvilajosana@eecs.berkeley.edu Subject: Re: [6tsch] the 4th control flow Hi Maria Rita, Thank you very much for the updated version. Regarding to who triggers Report Flow and Event Flow, I have different unde= rstanding as follows. Being different from Query Flow, both Report Flow and= Event Flow are triggered by nodes themselves, instead of a query from ME. = In particular, the Report Flow will be triggered by a timer, because it cor= responds to periodically reporting behavior; and the Event Flow will be tri= ggered by some event specified by ME in advance, something like a alarm. What do you think? Qin On Thu, Aug 29, 2013 at 5:00 PM, Maria Rita PALATTELLA > wrote: All, going back to the definition of the 4 control flows, I tried to fill s= ome of the TODO rows of the tables that Qin created so far. An updated version of these tables is attached. I left also some comments f= or discussing on. Any comment is welcome. Maria Rita From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Xavier Vilajos= ana Guillen Sent: Thursday, August 29, 2013 12:27 AM To: Qin Wang Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] the 4th control flow Hi, I also agree with the 4 message flows. as regards to Confirmation, this would introduce end-to-end confirmation at= L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an opti= onal feature? X On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang > wrote: Thomas, I agree to the 4 control flows. One more question for the two node->ME flow= s: Is a Confirmation from ME to node needed? Thanks Qin On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne > wrote: All, If possible, let's keep things simple and stick closely to the charter, cer= tainly for now. I would like to propose the following assumptions: * let's assume signaling and data packets are independent. IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking. * let's consider the steps highlighted in the charter, for now: * draft-vilajosana-6tsch-basic gives us a network with minimal conne= ctivity between all nodes in the network. Most of the schedule is empty, av= ailable ot some dynamic scheduler. * the scheduler uses the minimal connectivity to communicate, either= between neighbors (distributed), or between nodes and the PCE (centralized= ) If we agree with this, I propose we go back to discussing the types of flow= s, per the name of this thread. I'd like to call on a rough consensus for t= he following 4 flows: * ME->node * action * query * node->ME * report * event Thomas On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang > wrote: Thomas, I agree to keep different alternatives, at lease as options. Regarding to what kinds of cells should be used for conveying the report, s= hared cells or dedicated cells, I would like to leave them to configuration= . What do you think? Thanks Qin On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne > wrote: Qin, You bring up a good point: over what cells with the reports travel? Another= questions could be: over what cells will the request to install cells trav= el? I believe that, whatever the policy in place in the network, there will= always need to be some cells installed for infrequent signaling traffic. I= f the report rate is very slow, it might qualify as "infrequent signaling t= raffic". For sure, the request to change the schedule qualifies. Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha s= chedule indicated in the draft can be used for the signaling traffic betwee= n the nodes and the ME. Of course, if the report rate is very high, some de= dicate track might be installed, but I do not believe this is needed, certa= inly not this early on. I agree with Diego that keeping the solution open to different alternative = is key. Thomas On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne > wrote: Qin, Thomas, Alternative (1) adds delay to define the slots to send the event to the ME (propagate the new schedule), while alternative (2) keeps reserved slots waiting for the event to happen= . I think both alternatives should be included, and configured by the ME depe= nding on the network requirements. More thoughts? Diego Dujovne 2013/8/27 Qin Wang >: > Thomas, > > I agree with almost all. Only some comments on "Report Flow". > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-drive= n > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven repo= rt > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured b= y > ME, just like the interval of periodically report. Make sense? > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see. > (1) when a event is triggered, node sends a request to ME and ask some BW= to > send the report. I believe that is how the 4th control flow works. > (2) when ME configure the events and their triggers, ME also provisions s= ome > BW for the node which allows the node to send the report triggered by som= e > event. > > I have no strong opinion on which one is better. But, the bottom line is = the > configuration of the set of events and their triggers should be out of 6t= op > scope. Thought? > > Thanks > Qin > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: >> >> Qin, >> >> Please correct me if I'm wrong: >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typical >> commands are add/delete cells. >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> queries are about current cells usage or statistics. >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported >> information covers cells usage or statistics. >> >> Questions: >> - Looks like Query and Report flows contain the same information. In >> normal operation, the Report flow should be enough, the Query flow only >> being used in special cases, for example when the ME has lost state (jus= t >> booted, bug, etc). Agreed? >> - The ME should be able to configure the report flow. Configuration coul= d >> be "send report every X seconds" or "send report when variable X larger = than >> Y". I imagine this could be done over the action flow? Agreed? >> - A node will want to report an urgent event to the ME. One such events = is >> "the topology appears to have changed". There any many cases where this >> information needs to be sent immediately, i.e. no time to wait for the n= ext >> report cycle. We can consider this to be an asynchronous report, or part= of >> a new "Event" flow. >> - Same for the mote asking the ME for a schedule update. >> >> Thoughts? >> >> Thomas >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: >>> >>> Xavi, >>> >>> Approach-(2) is more flexible and likely covers more situations. But, i= t >>> may bring some complexity to 6top, because 6top has to make decision on= the >>> bandwidth request (add/delete), which needs some metrics, some intellig= ence. >>> >>> What do you think? >>> >>> Qin >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> > w= rote: >>>> >>>> Hi Qin, I like your (2). >>>> >>>> Note also that there are situations that might have some differences. >>>> >>>> 1-the track already exists. >>>> 2-the track between the two entities does not exists >>>> >>>> in either case I think that the node that requires certain BW to anoth= er >>>> node should talk to 6top, which processes that request and sends a req= uest >>>> to the ME, the ME installs that new track. >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> X >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: >>>>> >>>>> Hi all, >>>>> >>>>> During today's call, we presented three control flows between >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Re= port >>>>> Flow, and started to talk about the 4th control flow. The thread will >>>>> continue the discussion about 4th flow. >>>>> >>>>> Here is the scenario: when a node finds that more cells are needed, >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be ab= le to >>>>> ask ME to install more bandwidth. >>>>> >>>>> I can see two approaches: >>>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRat= e >>>>> is a attribute in 6top. Then, ME can get the information via Query Fl= ow or >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>>> Request to ME, and then ME install more bandwidth. This is the 4th co= ntrol >>>>> flow. >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> >> -- >> Thomas Watteyne, Ph. D >> Sr. Networking Design Engineer >> Dust Networks / Linear Technology >> 30695 Huntwood Ave >> Hayward, CA 94544-7021 >> +1 (510) 400-2978 >> twatteyne@linear.com >> >> This e-mail transmission, and any documents, files or previous e-mail >> messages attached to it may contain confidential information that is leg= ally >> privileged. If you are not the intended recipient, or a person responsib= le >> for delivering it to the intended recipient, you are hereby notified tha= t >> any disclosure, copying, distribution or use of any of the information >> contained in or attached to this transmission is STRICTLY PROHIBITED. If= you >> have received this transmission in error, please immediately notify me b= y >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original >> transmission and its attachments without reading or saving in any manner= . >> Thank you. > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD84143072Dxmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hello Qin:

     <= /p>

    I’m with you that t= he reports and events are initiated by the device.

     <= /p>

    Then there is the flow th= at we discussed at the call last week and that triggered this thread. The u= se case is a new control loop for which a sensor device talks to the controller (the PCE) to request the establishment of a path b= etween self and an actuator.

     <= /p>

    I imagined that this was = considered an event. But maybe not?

     <= /p>

    Pascal

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: jeudi 29 ao=FBt 2013 16:41
    To: Maria Rita PALATTELLA
    Cc: Thomas Watteyne; 6tsch@ietf.org; xvilajosana@eecs.berkeley.edu Subject: Re: [6tsch] the 4th control flow

     

    Hi Maria Rita,

     

    Thank you very much for the updated version.

     

    Regarding to who triggers Report Flow and Event Flow= , I have different understanding as follows. Being different from Query Flo= w, both Report Flow and Event Flow are triggered by nodes themselves, inste= ad of a query from ME. In particular, the Report Flow will be triggered by a timer, because it corresponds to pe= riodically reporting behavior; and the Event Flow will be triggered by some= event specified by ME in advance, something like a alarm.

     

    What do you think?

     

    Qin

     

     

    On Thu, Aug 29, 2013 at 5:00 PM, Maria Rita PALATTEL= LA <ma= ria-rita.palattella@uni.lu> wrote:

    All, going back to the definition of th= e 4 control flows, I tried to fill some of the TODO rows of the tables that Qin created so far.

     

    An updated version of these tables is a= ttached. I left also some comments for discussing on.

    Any comment is welcome.

     

    Maria Rita

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: Thursday, August 29, 2013 12:27 AM
    To: Qin Wang
    Cc: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] the 4th control flow

     

    Hi, I also agree with the 4 message flows.


    as regards to Confirmation, this would introduce end-to-end confirmation at= L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an opti= onal feature?


    X

     

    On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

     

    I agree to the 4 control flows. One more question for the two node= ->ME flows: Is a Confirmation from ME to node needed?

     

    Thanks

    Qin

     

    On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    All,

     

    If possible, let's keep things simple and stick closely to the cha= rter, certainly for now.

     

    I would like to propose the following assumptions:

    • let's assume signaling and data packets are independent.
      IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking.
    • let's consider the steps highlighted in the charter, for now:
      • draft-vilajosana-6tsch-basic gives us a network with minimal connectivity b= etween all nodes in the network. Most of the schedule is empty, available o= t some dynamic scheduler.
      • the scheduler uses the minimal connectivity to communicate, either between = neighbors (distributed), or between nodes and the PCE (centralized)

    If we agree with this, I propose we go back to discussing the type= s of flows, per the name of this thread. I'd like to call on a rough consen= sus for the following 4 flows:

    • ME->node
      • action
      • query
    • node->ME
      • report
      • event

    Thomas

     

     

    On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

     

    I agree to keep different alternatives, at lease as options.<= /o:p>

     

    Regarding to what kinds of cells should be used for conveying the = report, shared cells or dedicated cells, I would like to leave them to conf= iguration. What do you think?

     

    Thanks

    Qin

     

     

    On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    Qin,

     

    You bring up a good point: over what cells with the reports travel= ? Another questions could be: over what cells will the request to install c= ells travel? I believe that, whatever the policy in place in the network, there will always need to be some cell= s installed for infrequent signaling traffic. If the report rate is very sl= ow, it might qualify as "infrequent signaling traffic". For sure,= the request to change the schedule qualifies.

     

    Isn't the answer draft-vilajosana-6tsch-basic? That is, the s= lotted Aloha schedule indicated in the draft can be used for the signaling = traffic between the nodes and the ME. Of course, if the report rate is very high, some dedicate track might be inst= alled, but I do not believe this is needed, certainly not this early on.

     

    I agree with Diego that keeping the solution open to different alt= ernative is key.

     

    Thomas

     

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne <diego.dujovne@mail.= udp.cl> wrote:

    Qin, Thomas,
          Alternative (1) adds delay to define the slots to send= the event
    to the ME (propagate the new schedule),
    while alternative (2)  keeps reserved slots waiting for the event to h= appen.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driven r= eport
    > is. I think we don't want to assume 6top sublayer is very intelligent,= in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is  when and how the bandw= idth for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control flows = between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> += ;1 (510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125=

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    --_000_E045AECD98228444A58C61C200AE1BD84143072Dxmbrcdx01ciscoc_-- From qinwang@berkeley.edu Thu Aug 29 10:29:43 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 51B8511E812D for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 10:29:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.926 X-Spam-Level: X-Spam-Status: No, score=-2.926 tagged_above=-999 required=5 tests=[AWL=0.050, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CRORgQM8zaJt for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 10:29:37 -0700 (PDT) Received: from mail-vc0-f181.google.com (mail-vc0-f181.google.com [209.85.220.181]) by ietfa.amsl.com (Postfix) with ESMTP id 8000811E8123 for <6tsch@ietf.org>; Thu, 29 Aug 2013 10:29:37 -0700 (PDT) Received: by mail-vc0-f181.google.com with SMTP id hz10so536133vcb.40 for <6tsch@ietf.org>; Thu, 29 Aug 2013 10:29:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=yz56ctdaRWlOjyWAYAM4fjy/S4Qk1pjpRfipteG6MQA=; b=LSXO53Pz/wH6TrDqgU+tcKyImpgRrQwKp9yHylhUyEXsXtTmKG3rJ26enxjPCBJ3Ng ZKIc9vWibTCCP9k5GjnctFYlgtzLHYjgCG8hI3Qm68vGC+omAtUDoUwZH6vyhKm7Q0NZ SR+IrGL1AEU8ex6kEDukmoAGN6H01OWSYvwIIfvsEK86zxwGohhrV3yMwlTgtGsHt+sp UTo8CjxgUz9E/Ts+eSa1kquPcblZ1W0KD3HulyFDFPkNraVPN7dBjGQnsiL5TBUkfDxx aESbWroKyW5rp673KSmcJZHfjZ0csKLMaCBOHzQ88Us51CgtoMUMsIAETGdSabA3+RWB dJsw== X-Gm-Message-State: ALoCoQlueHD8y+HlVuGLQsYXD9R84kqgYWVlFCrl9TsfClMWrJzy8JOmv4ZL27pRrM2rMEgzY73p MIME-Version: 1.0 X-Received: by 10.58.165.4 with SMTP id yu4mr29131veb.39.1377797376769; Thu, 29 Aug 2013 10:29:36 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 29 Aug 2013 10:29:36 -0700 (PDT) In-Reply-To: References: Date: Fri, 30 Aug 2013 01:29:36 +0800 Message-ID: From: Qin Wang To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=047d7b670449370e1f04e51973d0 Cc: Maria Rita PALATTELLA , Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 17:29:43 -0000 --047d7b670449370e1f04e51973d0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Pascal, You are right, it is one kind of Event Flow. Thanks Qin On Thu, Aug 29, 2013 at 11:15 PM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Hello Qin:**** > > ** ** > > I=92m with you that the reports and events are initiated by the device. *= *** > > ** ** > > Then there is the flow that we discussed at the call last week and that > triggered this thread. The use case is a new control loop for which a > sensor device talks to the controller (the PCE) to request the > establishment of a path between self and an actuator.**** > > ** ** > > I imagined that this was considered an event. But maybe not?**** > > ** ** > > Pascal**** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* jeudi 29 ao=FBt 2013 16:41 > *To:* Maria Rita PALATTELLA > *Cc:* Thomas Watteyne; 6tsch@ietf.org; xvilajosana@eecs.berkeley.edu > > *Subject:* Re: [6tsch] the 4th control flow**** > > ** ** > > Hi Maria Rita,**** > > ** ** > > Thank you very much for the updated version.**** > > ** ** > > Regarding to who triggers Report Flow and Event Flow, I have different > understanding as follows. Being different from Query Flow, both Report Fl= ow > and Event Flow are triggered by nodes themselves, instead of a query from > ME. In particular, the Report Flow will be triggered by a timer, because = it > corresponds to periodically reporting behavior; and the Event Flow will b= e > triggered by some event specified by ME in advance, something like a alar= m. > **** > > ** ** > > What do you think?**** > > ** ** > > Qin**** > > ** ** > > ** ** > > On Thu, Aug 29, 2013 at 5:00 PM, Maria Rita PALATTELLA < > maria-rita.palattella@uni.lu> wrote:**** > > All, going back to the definition of the 4 control flows, I tried to fill > some of the TODO rows of the tables that Qin created so far.**** > > **** > > An updated version of these tables is attached. I left also some comments > for discussing on.**** > > Any comment is welcome.**** > > **** > > Maria Rita**** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Xavier Vilajosana Guillen > *Sent:* Thursday, August 29, 2013 12:27 AM > *To:* Qin Wang > *Cc:* Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] the 4th control flow**** > > **** > > Hi, I also agree with the 4 message flows.**** > > > as regards to Confirmation, this would introduce end-to-end confirmation > at L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an > optional feature? > > > X**** > > **** > > On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang wrote:**= * > * > > Thomas,**** > > **** > > I agree to the 4 control flows. One more question for the two node->ME > flows: Is a Confirmation from ME to node needed?**** > > **** > > Thanks**** > > Qin**** > > **** > > On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > All,**** > > **** > > If possible, let's keep things simple and stick closely to the charter, > certainly for now.**** > > **** > > I would like to propose the following assumptions:**** > > - let's assume signaling and data packets are independent. > IMO, signaling packets are either short and infrequent (events, > commands), or periodic and large (statistics). Once we have run a numb= er of > networks, and can quantify the trade-offs, we can consider piggybackin= g. > **** > - let's consider the steps highlighted in the charter, for now:**** > > > - draft-vilajosana-6tsch-basic gives us a network with minimal > connectivity between all nodes in the network. Most of the schedule= is > empty, available ot some dynamic scheduler.**** > - the scheduler uses the minimal connectivity to communicate, > either between neighbors (distributed), or between nodes and the PC= E > (centralized)**** > > If we agree with this, I propose we go back to discussing the types of > flows, per the name of this thread. I'd like to call on a rough consensus > for the following 4 flows:**** > > - ME->node**** > > > - action**** > - query**** > > > - node->ME**** > > > - report**** > - event**** > > Thomas**** > > **** > > **** > > On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang wrote:**= * > * > > Thomas,**** > > **** > > I agree to keep different alternatives, at lease as options.**** > > **** > > Regarding to what kinds of cells should be used for conveying the report, > shared cells or dedicated cells, I would like to leave them to > configuration. What do you think?**** > > **** > > Thanks**** > > Qin**** > > **** > > **** > > On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > Qin,**** > > **** > > You bring up a good point: over what cells with the reports travel? > Another questions could be: over what cells will the request to install > cells travel? I believe that, whatever the policy in place in the network= , > there will always need to be some cells installed for infrequent signalin= g > traffic. If the report rate is very slow, it might qualify as "infrequent > signaling traffic". For sure, the request to change the schedule qualifie= s. > **** > > **** > > Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha > schedule indicated in the draft can be used for the signaling traffic > between the nodes and the ME. Of course, if the report rate is very high, > some dedicate track might be installed, but I do not believe this is > needed, certainly not this early on.**** > > **** > > I agree with Diego that keeping the solution open to different alternativ= e > is key.**** > > **** > > Thomas**** > > **** > > On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne < > diego.dujovne@mail.udp.cl> wrote:**** > > Qin, Thomas, > Alternative (1) adds delay to define the slots to send the event > to the ME (propagate the new schedule), > while alternative (2) keeps reserved slots waiting for the event to > happen. > I think both alternatives should be included, and configured by the ME > depending > on the network requirements. > > More thoughts? > > Diego Dujovne > > 2013/8/27 Qin Wang :**** > > > Thomas, > > > > I agree with almost all. Only some comments on "Report Flow". > > > > As you mentioned, there are two kinds of report scenarios, one is > > periodically report, another one is burst report or called as > event-driven > > report. I have no question on how periodically report works, which you > > described. But I'm not sure what the best way to handle event-driven > report > > is. I think we don't want to assume 6top sublayer is very intelligent, = in > > another word, the events and the trigger of events should be configured > by > > ME, just like the interval of periodically report. Make sense? > > > > If you agree to it, the remained issue is when and how the bandwidth f= or > > sending event-driven reports is reserved. Here are two ways I can see. > > (1) when a event is triggered, node sends a request to ME and ask some > BW to > > send the report. I believe that is how the 4th control flow works. > > (2) when ME configure the events and their triggers, ME also provisions > some > > BW for the node which allows the node to send the report triggered by > some > > event. > > > > I have no strong opinion on which one is better. But, the bottom line i= s > the > > configuration of the set of events and their triggers should be out of > 6top > > scope. Thought? > > > > Thanks > > Qin > > > > > > > > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: > >> > >> Qin, > >> > >> Please correct me if I'm wrong: > >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typica= l > >> commands are add/delete cells. > >> - Query Flow (ME->6top). ME asks 6top for some information. Typical > >> queries are about current cells usage or statistics. > >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical report= ed > >> information covers cells usage or statistics. > >> > >> Questions: > >> - Looks like Query and Report flows contain the same information. In > >> normal operation, the Report flow should be enough, the Query flow onl= y > >> being used in special cases, for example when the ME has lost state > (just > >> booted, bug, etc). Agreed? > >> - The ME should be able to configure the report flow. Configuration > could > >> be "send report every X seconds" or "send report when variable X large= r > than > >> Y". I imagine this could be done over the action flow? Agreed? > >> - A node will want to report an urgent event to the ME. One such event= s > is > >> "the topology appears to have changed". There any many cases where thi= s > >> information needs to be sent immediately, i.e. no time to wait for the > next > >> report cycle. We can consider this to be an asynchronous report, or > part of > >> a new "Event" flow. > >> - Same for the mote asking the ME for a schedule update. > >> > >> Thoughts? > >> > >> Thomas > >> > >> > >> > >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: > >>> > >>> Xavi, > >>> > >>> Approach-(2) is more flexible and likely covers more situations. But, > it > >>> may bring some complexity to 6top, because 6top has to make decision > on the > >>> bandwidth request (add/delete), which needs some metrics, some > intelligence. > >>> > >>> What do you think? > >>> > >>> Qin > >>> > >>> > >>> > >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen > >>> wrote: > >>>> > >>>> Hi Qin, I like your (2). > >>>> > >>>> Note also that there are situations that might have some differences= . > >>>> > >>>> 1-the track already exists. > >>>> 2-the track between the two entities does not exists > >>>> > >>>> in either case I think that the node that requires certain BW to > another > >>>> node should talk to 6top, which processes that request and sends a > request > >>>> to the ME, the ME installs that new track. > >>>> > >>>> does it make sense. Do you see any drawback on that approach? > >>>> > >>>> X > >>>> > >>>> > >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: > >>>>> > >>>>> Hi all, > >>>>> > >>>>> During today's call, we presented three control flows between > >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and > Report > >>>>> Flow, and started to talk about the 4th control flow. The thread wi= ll > >>>>> continue the discussion about 4th flow. > >>>>> > >>>>> Here is the scenario: when a node finds that more cells are needed, > >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be > able to > >>>>> ask ME to install more bandwidth. > >>>>> > >>>>> I can see two approaches: > >>>>> (1) Managed by ME, without 4th Control Flow. Assume > BandwidthUsageRate > >>>>> is a attribute in 6top. Then, ME can get the information via Query > Flow or > >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. > >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth > >>>>> Request to ME, and then ME install more bandwidth. This is the 4th > control > >>>>> flow. > >>>>> > >>>>> What do you think? Which one makes more sense? > >>>>> > >>>>> Qin > >>>>> > >>>>> > >>>>> > >>>>> _______________________________________________ > >>>>> 6tsch mailing list > >>>>> 6tsch@ietf.org > >>>>> https://www.ietf.org/mailman/listinfo/6tsch > >>>>> > >>>> > >>> > >>> > >>> _______________________________________________ > >>> 6tsch mailing list > >>> 6tsch@ietf.org > >>> https://www.ietf.org/mailman/listinfo/6tsch > >>> > >> > >> > >> > >> -- > >> Thomas Watteyne, Ph. D > >> Sr. Networking Design Engineer > >> Dust Networks / Linear Technology > >> 30695 Huntwood Ave > >> Hayward, CA 94544-7021 > >> +1 (510) 400-2978 > >> twatteyne@linear.com > >> > >> This e-mail transmission, and any documents, files or previous e-mail > >> messages attached to it may contain confidential information that is > legally > >> privileged. If you are not the intended recipient, or a person > responsible > >> for delivering it to the intended recipient, you are hereby notified > that > >> any disclosure, copying, distribution or use of any of the information > >> contained in or attached to this transmission is STRICTLY PROHIBITED. > If you > >> have received this transmission in error, please immediately notify me > by > >> reply e-mail, or by telephone at (510) 400-2978, and destroy the > original > >> transmission and its attachments without reading or saving in any > manner. > >> Thank you. > > > > > > > > _______________________________________________ > > 6tsch mailing list > > 6tsch@ietf.org > > https://www.ietf.org/mailman/listinfo/6tsch > > > > > > --**** > > DIEGO DUJOVNE > Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones > Facultad de Ingenier=EDa UDP > www.ingenieria.udp.cl > (56 2) 676 8125**** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > ** ** > --047d7b670449370e1f04e51973d0 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Pascal,

    You are right, it is one kind o= f Event Flow.

    Thanks
    Qin


    On Thu, Aug 29, 2= 013 at 11:15 PM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Qin:

    =A0<= /p>

    I=92m with you that the r= eports and events are initiated by the device.

    =A0<= /p>

    Then there is the flow th= at we discussed at the call last week and that triggered this thread. The u= se case is a new control loop for which a sensor device talks to the controller (the PCE) to request the establishment of a path b= etween self and an actuator.

    =A0<= /p>

    I imagined that this was = considered an event. But maybe not?

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: jeudi 29 ao=FBt 2013 16:41
    To: Maria Rita PALATTELLA
    Cc: Thomas Watteyne; 6tsch@ietf.org; xvilajosana@eecs.berkeley.edu


    Subject: Re: [6tsch] the 4th control flow
    <= p>

    =A0

    Hi Maria Rita,

    =A0

    Thank you very much for the updated version.<= u>

    =A0

    Regarding to who triggers Report Flow and Event Flow= , I have different understanding as follows. Being different from Query Flo= w, both Report Flow and Event Flow are triggered by nodes themselves, inste= ad of a query from ME. In particular, the Report Flow will be triggered by a timer, because it corresponds to pe= riodically reporting behavior; and the Event Flow will be triggered by some= event specified by ME in advance, something like a alarm.

    =A0

    What do you think?

    =A0

    Qin

    =A0

    =A0

    On Thu, Aug 29, 2013 at 5:00 PM, Maria Rita PALATTEL= LA <ma= ria-rita.palattella@uni.lu> wrote:

    All, going back to the de= finition of the 4 control flows, I tried to fill some of the TODO rows of the tables that Qin created so far.

    =A0<= /p>

    An updated version of the= se tables is attached. I left also some comments for discussing on.<= u>

    Any comment is welcome.

    =A0<= /p>

    Maria Rita<= u>

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: Thursday, August 29, 2013 12:27 AM
    To: Qin Wang
    Cc: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] the 4th control flow

    =A0

    Hi, I also agree with the 4 message flows.=


    as regards to Confirmation, this would introduce end-to-end confirmation at= L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an = optional feature?


    X

    =A0

    On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

    =A0

    I agree to the 4 control flows. One more question fo= r the two node->ME flows: Is a Confirmation from ME to node needed?

    =A0

    Thanks

    Qin

    =A0

    On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    All,

    =A0

    If possible, let's keep things simple and stick = closely to the charter, certainly for now.

    =A0

    I would like to propose the following assumptions:

    • let's assume signaling and data packets are independent.
      IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking.
    • let's consider the steps highlighted in the charter, for now:=
      • draft-vilajosana-6tsch-basic gives us a network with minimal connectivity b= etween all nodes in the network. Most of the schedule is empty, available o= t some dynamic scheduler.
      • the scheduler uses the minimal connectivity to communicate, either between = neighbors (distributed), or between nodes and the PCE (centralized)<= u>

    If we agree with this, I propose we go back to discu= ssing the types of flows, per the name of this thread. I'd like to call= on a rough consensus for the following 4 flows:

    • ME->node
      • action
      • query
    • node->ME
      • report
      • event

    Thomas

    =A0

    =A0

    On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

    =A0

    I agree to keep different alternatives, at lease as = options.

    =A0

    Regarding to what kinds of cells should be used for = conveying the report, shared cells or dedicated cells, I would like to leav= e them to configuration. What do you think?

    =A0

    Thanks

    Qin

    =A0

    =A0

    On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    Qin,

    =A0

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in the network, there will always need to be some cell= s installed for infrequent signaling traffic. If the report rate is very sl= ow, it might qualify as "infrequent signaling traffic". For sure,= the request to change the schedule qualifies.

    =A0

    Isn't the answer=A0draft-vilajosana-6tsch-basic?= That is, the slotted Aloha schedule indicated in the draft can be used for= the signaling traffic between the nodes and the ME. Of course, if the report rate is very high, some dedicate track might be inst= alled, but I do not believe this is needed, certainly not this early on.=

    =A0

    I agree with Diego that keeping the solution open to= different alternative is key.

    =A0

    Thomas

    =A0

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
    =A0 =A0 =A0 Alternative (1) adds delay to define the slots to send the even= t
    to the ME (propagate the new schedule),
    while alternative (2) =A0keeps reserved slots waiting for the event to happ= en.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driv= en report
    > is. I think we don't want to assume 6top sublayer is very intellig= ent, in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is =A0when and how the bandwidt= h for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control fl= ows between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (= 510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125=

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


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    6tsch@ietf.org
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    =A0

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
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    =A0

    =A0


    --047d7b670449370e1f04e51973d0-- From qinwang@berkeley.edu Thu Aug 29 10:45:21 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F62221F935A for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 10:45:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.627 X-Spam-Level: X-Spam-Status: No, score=-2.627 tagged_above=-999 required=5 tests=[AWL=-0.251, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_46=0.6, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xEBZtjWQveGF for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 10:45:16 -0700 (PDT) Received: from mail-ve0-f174.google.com (mail-ve0-f174.google.com [209.85.128.174]) by ietfa.amsl.com (Postfix) with ESMTP id 1566511E814E for <6tsch@ietf.org>; Thu, 29 Aug 2013 10:45:07 -0700 (PDT) Received: by mail-ve0-f174.google.com with SMTP id d10so565966vea.19 for <6tsch@ietf.org>; Thu, 29 Aug 2013 10:45:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=9XB//4Ls6sT8f45OuHcPu4wkbtajH781IbpFd769WVI=; b=KBJ9BXt4dGug7i5Umx5Kbni/YPwudq2mCvwSaF+l5cn+OjyJDD678ikcaBPtDJ04FA /IcJc5ZrbAS8qxWMBl5ri+a26Th/YCM6ofl9H+DiHAVOIynKr/9o89jF5smb0Lb3coqb wIpXkH2wAzwTtP7wCHQwXcovWmtz7QHrGQn87egPAPLKqyWTt9nEBiLS+ftkTjfRKRHs FYTxZbBuBzCTHiRZhJyRTyy5k+sR0bhwTCkD3No3nVdeOv6viMvDevC4g5BbaqmS2p6O hbSU39r2XCsN8iLxXz44zdtCWSPSdUcs384SAlF+03I4N4d+oSrE4cAzXa3NhbmSZXe0 MogQ== X-Gm-Message-State: ALoCoQngdIZlDXyGRa/OnRsGtGyIYYDR6cbA/BzvdBnKXvNI9FtJ1J+VkLx0L2fdtej5EJf6iLW3 MIME-Version: 1.0 X-Received: by 10.52.186.65 with SMTP id fi1mr860820vdc.41.1377798306525; Thu, 29 Aug 2013 10:45:06 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 29 Aug 2013 10:45:06 -0700 (PDT) In-Reply-To: References: Date: Fri, 30 Aug 2013 01:45:06 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/mixed; boundary=bcaec547cb79a208ad04e519aa9d Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] format of management message X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 17:45:21 -0000 --bcaec547cb79a208ad04e519aa9d Content-Type: multipart/alternative; boundary=bcaec547cb79a208a804e519aa9b --bcaec547cb79a208a804e519aa9b Content-Type: text/plain; charset=ISO-8859-1 Hi Thomas, Xavi and all, I did a comparison on some data coding methods (JSON, CBOR,UBJSON, BSON), not completely yet. See the attached file. I compare them from two angles, one is their data types, another one is the overhead from the data format in storage to the data format in exchanged messages. Xavi, do you know the proper link for EXI? Any input is welcome. Thanks Qin On Wed, Aug 28, 2013 at 2:26 AM, Thomas Watteyne wrote: > Qin, > > Very much along the same line here. The scope of work item 1 from > https://bitbucket.org/6tsch/charter-ietf-6tsch/src/ is the format of the > data that is exchanged, i.e. what you would see if you started Wireshark. I > don't believe we are making any assumption on the way the data is stored > inside the devices. I believe it is safe to assume that this is > implementation-specific and out of scope. > > Thomas > > On Mon, Aug 26, 2013 at 3:56 PM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote: > >> Hi Qin, >> >> I see it like you indicate at (1). The format and encoding is only used >> in the payload of exchanged messages. >> >> as regards to (2) >> - 1) Computational complexity is a limiting factor if we want to be able >> to run in 8bit uC. So this is important. >> - 2) Compact data size. This can be easily experimented as soon as we >> have some formats defined. >> - 3) I don't think the tool is a problem as most of this formats have a >> tool. >> >> (3) I know about EXI (Efficeint XML) which compares to ASN.1. I am not an >> expert of that and I do not know if BSON or CBOR perform better but it >> might be another candidate. >> >> X >> >> >> On Mon, Aug 26, 2013 at 3:38 PM, Qin Wang wrote: >> >>> Dear All, >>> >>> According to last Friday's call, we start the thread to discuss the >>> format of management message. >>> >>> Background: >>> The management messages are exchanged between a Management Entity (ME) >>> and 6top, and the ME can be existing in PCE or upper layer of 6top. In some >>> other threads, we have been discussing about the control flows and the >>> content of control flows, which can be used as reference. >>> >>> Consideration: >>> (1) Where the format will be used? IMHO, the format, which we are >>> talking about, is only used to express the exchanged messages, it should >>> not be used in storage like MIB. Thus, Compacting is a process of >>> translating the data in storage format to the data in message format, and >>> De-compacting is a reverse process. Make sense? >>> >>> (2) Criteria of evaluation. >>> -- Compact data size >>> -- Computational complexity of Compacting/De-compacting >>> -- tool is existing or not >>> -- .... more? >>> >>> (3) Candidates: CBOR, JSON, BSON, and ...... >>> >>> Any comments and suggestions are welcome. >>> >>> Thanks >>> Qin >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --bcaec547cb79a208a804e519aa9b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Thomas, Xavi and all,

    I did a compar= ison on some data coding methods (JSON, CBOR,UBJSON, BSON), not completely = yet. See the attached file.=A0

    I compare them from= two angles, one is their data types, another one is the overhead from the = data format in storage to the data format in exchanged messages.

    Xavi, do you know the proper link for EXI?
    Any input is welcome.

    Thanks
    Qin


    On Wed, Aug 28, 2013 at 2:26 AM, Thomas Watteyne <watteyne@eecs.b= erkeley.edu> wrote:
    Qin,

    Very much along the same line here= . The scope of work item 1 from=A0https://bitbucket.org/6tsch/charte= r-ietf-6tsch/src/=A0is the format of the data that is exchanged, i.e. w= hat you would see if you started Wireshark. I don't believe we are maki= ng any assumption on the way the data is stored inside the devices. I belie= ve it is safe to assume that this is implementation-specific and out of sco= pe.

    Thomas

    On Mon, Aug 26, 2013 at= 3:56 PM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley= .edu> wrote:
    Hi Qin,

    I see it like you indicate at (1). The format and encoding is only used= in the payload of exchanged messages.

    as regards to (2)
    - 1) Computational complexi= ty is a limiting factor if we want to be able to run in 8bit uC. So this is= important.
    - 2) Compact data size. This can be easily experimented as soon = as we have some formats defined.
    - 3) I don't think the = tool is a problem as most of this formats have a tool.

    (3) I know about EXI (Efficeint XML) which compares to ASN.1. I am not an e= xpert of that and I do not know if BSON or CBOR perform better but it might= be another candidate.

    X


    On Mon, Aug 26, 2013 at 3:38 P= M, Qin Wang <qinwang@berkeley.edu> wrote:
    Dear All,

    According to last Friday'= s call, we start the thread to discuss the format of management message.=A0=

    Background:
    The management messages are= exchanged between a Management Entity (ME) and 6top, and the ME can be exi= sting in PCE or upper layer of 6top. In some other threads, we have been di= scussing about the control flows and the content of control flows, which ca= n be used as reference.

    Consideration:
    (1) Where the format will be u= sed? IMHO, the format, which we are talking about, is only used to express = the exchanged messages, it should not be used in storage like MIB. Thus, Co= mpacting is a process of translating the data in storage format to the data= in message format, and De-compacting is a reverse process. Make sense?
    =A0=A0
    (2) Criteria of evaluation.=A0
    =A0 =A0 -- C= ompact data size
    =A0 =A0 -- Computational complexity of Compactin= g/De-compacting
    =A0 =A0 -- tool is existing or not
    =A0 = =A0 -- .... more?

    (3) Candidates: CBOR, JSON, BSON, and ......
    = =A0
    Any comments and suggestions are welcome.

    Thanks
    Qin

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    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


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AAAAAAAAchcAAHdvcmQvdGhlbWUvdGhlbWUxLnhtbFBLAQItABQABgAIAAAAIQB//gNKEwUAAFkN AAARAAAAAAAAAAAAAAAAAFkeAAB3b3JkL3NldHRpbmdzLnhtbFBLAQItABQABgAIAAAAIQAXoBZO AgEAAKwBAAAUAAAAAAAAAAAAAAAAAJsjAAB3b3JkL3dlYlNldHRpbmdzLnhtbFBLAQItABQABgAI AAAAIQATxrfnhAgAACVBAAAaAAAAAAAAAAAAAAAAAM8kAAB3b3JkL3N0eWxlc1dpdGhFZmZlY3Rz LnhtbFBLAQItABQABgAIAAAAIQB8s/K1VwEAAIcCAAARAAAAAAAAAAAAAAAAAIstAABkb2NQcm9w cy9jb3JlLnhtbFBLAQItABQABgAIAAAAIQA1Rb+QAQgAADQ+AAAPAAAAAAAAAAAAAAAAABkwAAB3 b3JkL3N0eWxlcy54bWxQSwECLQAUAAYACAAAACEAfSzzBEUCAADNBgAAEgAAAAAAAAAAAAAAAABH OAAAd29yZC9mb250VGFibGUueG1sUEsBAi0AFAAGAAgAAAAhAM/UEGJ4AQAAywIAABAAAAAAAAAA AAAAAAAAvDoAAGRvY1Byb3BzL2FwcC54bWxQSwUGAAAAAAwADAAJAwAAaj0AAAAA --bcaec547cb79a208ad04e519aa9d-- From diego.dujovne@mail.udp.cl Thu Aug 29 10:59:00 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4C58611E813A for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 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:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=Pq/VwESGOocbHWc2eWF8/LXBFXTBFyAANhweOJDAxC8=; b=QbG/nNZeTCKXQcSzvsEULHU9WI5jbzXJnSVHaCMxYkMHqW6l45GNfaJNxrt8wC/rvc wFXm7FGXkNKXRkeQ+0+xhGUp4vso+do4sr/De0cwmnvzgn1T5N+VzHRuB0ppss4P0opo gtTpt8JbKWdfuWEObTIUmhZCnW8yG6IjOgzPawmzfZwtH7xsGZxozueYtsMiAbtQSiF4 21w2/++nKTnQzgp1KB3KAXsQGIoRbs9Ajo4tiBZVUh+3OblWTgXSWotEbOrEK25aOTT3 HiwyFs81iI7HmTQexE7p3SIR8cmw4FrL9bX5pbAhe0hB428ETsm2XRBGfSxF5ZSmkIju kktw== X-Gm-Message-State: ALoCoQmIhJoM5iyv2zMpLBiNgDC1ymalznSmIOuKCbwKILI835SOxgMLLxQGJbiB08E5YE0ApHWP MIME-Version: 1.0 X-Received: by 10.180.109.65 with SMTP id hq1mr1031250wib.53.1377799124465; Thu, 29 Aug 2013 10:58:44 -0700 (PDT) Received: by 10.194.122.103 with HTTP; Thu, 29 Aug 2013 10:58:44 -0700 (PDT) In-Reply-To: References: Date: Thu, 29 Aug 2013 13:58:44 -0400 Message-ID: From: "Prof. Diego Dujovne" To: Qin Wang Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] format of management message X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 17:59:01 -0000 Hi Thomas, Are you looking for the EXI spec, such as the one specified on this link?: http://www.w3.org/TR/exi/#encodingDatatypes Diego 2013/8/29 Qin Wang : > Hi Thomas, Xavi and all, > > I did a comparison on some data coding methods (JSON, CBOR,UBJSON, BSON), > not completely yet. See the attached file. > > I compare them from two angles, one is their data types, another one is t= he > overhead from the data format in storage to the data format in exchanged > messages. > > Xavi, do you know the proper link for EXI? > > Any input is welcome. > > Thanks > Qin > > > On Wed, Aug 28, 2013 at 2:26 AM, Thomas Watteyne > wrote: >> >> Qin, >> >> Very much along the same line here. The scope of work item 1 from >> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/ is the format of the >> data that is exchanged, i.e. what you would see if you started Wireshark= . I >> don't believe we are making any assumption on the way the data is stored >> inside the devices. I believe it is safe to assume that this is >> implementation-specific and out of scope. >> >> Thomas >> >> On Mon, Aug 26, 2013 at 3:56 PM, Xavier Vilajosana Guillen >> wrote: >>> >>> Hi Qin, >>> >>> I see it like you indicate at (1). The format and encoding is only used >>> in the payload of exchanged messages. >>> >>> as regards to (2) >>> - 1) Computational complexity is a limiting factor if we want to be abl= e >>> to run in 8bit uC. So this is important. >>> - 2) Compact data size. This can be easily experimented as soon as we >>> have some formats defined. >>> - 3) I don't think the tool is a problem as most of this formats have a >>> tool. >>> >>> (3) I know about EXI (Efficeint XML) which compares to ASN.1. I am not = an >>> expert of that and I do not know if BSON or CBOR perform better but it = might >>> be another candidate. >>> >>> X >>> >>> >>> On Mon, Aug 26, 2013 at 3:38 PM, Qin Wang wrote: >>>> >>>> Dear All, >>>> >>>> According to last Friday's call, we start the thread to discuss the >>>> format of management message. >>>> >>>> Background: >>>> The management messages are exchanged between a Management Entity (ME) >>>> and 6top, and the ME can be existing in PCE or upper layer of 6top. In= some >>>> other threads, we have been discussing about the control flows and the >>>> content of control flows, which can be used as reference. >>>> >>>> Consideration: >>>> (1) Where the format will be used? IMHO, the format, which we are >>>> talking about, is only used to express the exchanged messages, it shou= ld not >>>> be used in storage like MIB. Thus, Compacting is a process of translat= ing >>>> the data in storage format to the data in message format, and De-compa= cting >>>> is a reverse process. Make sense? >>>> >>>> (2) Criteria of evaluation. >>>> -- Compact data size >>>> -- Computational complexity of Compacting/De-compacting >>>> -- tool is existing or not >>>> -- .... more? >>>> >>>> (3) Candidates: CBOR, JSON, BSON, and ...... >>>> >>>> Any comments and suggestions are welcome. >>>> >>>> Thanks >>>> Qin >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > --=20 DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 From xvilajosana@berkeley.edu Thu Aug 29 10:59:20 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6C26F11E8142 for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 10:59:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.916 X-Spam-Level: X-Spam-Status: No, score=-1.916 tagged_above=-999 required=5 tests=[AWL=-0.540, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_46=0.6] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BIioqAc7l71R for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 10:58:58 -0700 (PDT) Received: from mail-pd0-f174.google.com (mail-pd0-f174.google.com [209.85.192.174]) by ietfa.amsl.com (Postfix) with ESMTP id 17B8B11E8146 for <6tsch@ietf.org>; Thu, 29 Aug 2013 10:58:55 -0700 (PDT) Received: by mail-pd0-f174.google.com with SMTP id y13so768638pdi.19 for <6tsch@ietf.org>; Thu, 29 Aug 2013 10:58:54 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=h7IsOgYnc5ouL5oqujBMWkW4WvkWRPqxCGuAYsza0cQ=; b=ZjcSAZDtnWzPUGCkqKNTWpGbclBYjWTpK62OUUnr5SwGL6biVby+37K8v/NZkNnBNQ Ekdu4EXHYMgcrVV2sJ0ruq6UGQVtWrFCMfCGm3L3zqdLfVdI5rYEK1z8Csw/wIkIi9BV 1fXwfirZnOn9Fic8oeeoD38OM5XiCbhTyKKA4hrYWPxYic6AqEErDvLv1/5YJx/29mnX WhgVmhNeO6XFuE9PruwMZYz5NXK3bWYNcYqUz5vY0CcJtjOF83lOUyfAzQtFfyVRiI8M YSXhVZhPQCQpNg6POtFByi2DveRSzy9SDyuVOYlmWSxY2V1fPFJDicDodddyHjL6CSDp MCnw== X-Gm-Message-State: ALoCoQnakPYlhOx7ykP2bSZjrDvyk6p9zgrtBBsVkqrBF/AMDb2sYnLXbn6O+ArUiT6QMVeWuhXU MIME-Version: 1.0 X-Received: by 10.68.36.132 with SMTP id q4mr5108174pbj.118.1377799134711; Thu, 29 Aug 2013 10:58:54 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Thu, 29 Aug 2013 10:58:54 -0700 (PDT) In-Reply-To: References: Date: Thu, 29 Aug 2013 10:58:54 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=bcaec5216259ff1d6a04e519dbc1 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] format of management message X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 17:59:26 -0000 --bcaec5216259ff1d6a04e519dbc1 Content-Type: text/plain; charset=ISO-8859-1 Hi Qin, this is the EXI specification http://www.w3.org/TR/exi/ I go through your document and I will come back with comments. X On Thu, Aug 29, 2013 at 10:45 AM, Qin Wang wrote: > Hi Thomas, Xavi and all, > > I did a comparison on some data coding methods (JSON, CBOR,UBJSON, BSON), > not completely yet. See the attached file. > > I compare them from two angles, one is their data types, another one is > the overhead from the data format in storage to the data format in > exchanged messages. > > Xavi, do you know the proper link for EXI? > > Any input is welcome. > > Thanks > Qin > > > On Wed, Aug 28, 2013 at 2:26 AM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote: > >> Qin, >> >> Very much along the same line here. The scope of work item 1 from >> https://bitbucket.org/6tsch/charter-ietf-6tsch/src/ is the format of the >> data that is exchanged, i.e. what you would see if you started Wireshark. I >> don't believe we are making any assumption on the way the data is stored >> inside the devices. I believe it is safe to assume that this is >> implementation-specific and out of scope. >> >> Thomas >> >> On Mon, Aug 26, 2013 at 3:56 PM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote: >> >>> Hi Qin, >>> >>> I see it like you indicate at (1). The format and encoding is only used >>> in the payload of exchanged messages. >>> >>> as regards to (2) >>> - 1) Computational complexity is a limiting factor if we want to be able >>> to run in 8bit uC. So this is important. >>> - 2) Compact data size. This can be easily experimented as soon as we >>> have some formats defined. >>> - 3) I don't think the tool is a problem as most of this formats have a >>> tool. >>> >>> (3) I know about EXI (Efficeint XML) which compares to ASN.1. I am not >>> an expert of that and I do not know if BSON or CBOR perform better but it >>> might be another candidate. >>> >>> X >>> >>> >>> On Mon, Aug 26, 2013 at 3:38 PM, Qin Wang wrote: >>> >>>> Dear All, >>>> >>>> According to last Friday's call, we start the thread to discuss the >>>> format of management message. >>>> >>>> Background: >>>> The management messages are exchanged between a Management Entity (ME) >>>> and 6top, and the ME can be existing in PCE or upper layer of 6top. In some >>>> other threads, we have been discussing about the control flows and the >>>> content of control flows, which can be used as reference. >>>> >>>> Consideration: >>>> (1) Where the format will be used? IMHO, the format, which we are >>>> talking about, is only used to express the exchanged messages, it should >>>> not be used in storage like MIB. Thus, Compacting is a process of >>>> translating the data in storage format to the data in message format, and >>>> De-compacting is a reverse process. Make sense? >>>> >>>> (2) Criteria of evaluation. >>>> -- Compact data size >>>> -- Computational complexity of Compacting/De-compacting >>>> -- tool is existing or not >>>> -- .... more? >>>> >>>> (3) Candidates: CBOR, JSON, BSON, and ...... >>>> >>>> Any comments and suggestions are welcome. >>>> >>>> Thanks >>>> Qin >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >> >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --bcaec5216259ff1d6a04e519dbc1 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Qin,

    this is the EXI specificati= on
    http://www.w3.org/TR/exi/
    I go through your document and I will come back with comments.<= br> X


    On= Thu, Aug 29, 2013 at 10:45 AM, Qin Wang <qinwang@berkeley.edu><= /span> wrote:
    Hi Thomas, Xavi and all,
    I did a comparison on some data coding methods (JSON, CBOR= ,UBJSON, BSON), not completely yet. See the attached file.=A0

    I compare them from two angles, one is their data types= , another one is the overhead from the data format in storage to the data f= ormat in exchanged messages.

    Xavi, do you know the proper link for EXI?
    Any input is welcome.

    Thanks
    Qin


    =
    On Wed, Aug 28, 2013 at 2:26 AM, Thomas Watteyne <watteyne@eecs.b= erkeley.edu> wrote:
    Qin,

    Very much along the same line here= . The scope of work item 1 from=A0https://bitbucket.org/6tsch/charte= r-ietf-6tsch/src/=A0is the format of the data that is exchanged, i.e. w= hat you would see if you started Wireshark. I don't believe we are maki= ng any assumption on the way the data is stored inside the devices. I belie= ve it is safe to assume that this is implementation-specific and out of sco= pe.

    Thomas

    On Mon, Aug 26, 2013 at 3:56 PM, Xav= ier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu><= /span> wrote:
    Hi Qin,

    I see it like you indicate at (1). The format and encoding is only used= in the payload of exchanged messages.

    as regards to (2)
    - 1) Computational complexi= ty is a limiting factor if we want to be able to run in 8bit uC. So this is= important.
    - 2) Compact data size. This can be easily experimented as soon = as we have some formats defined.
    - 3) I don't think the = tool is a problem as most of this formats have a tool.

    (3) I know about EXI (Efficeint XML) which compares to ASN.1. I am not an e= xpert of that and I do not know if BSON or CBOR perform better but it might= be another candidate.

    X


    On Mon, Aug 26, 2013 at 3:38 P= M, Qin Wang <qinwang@berkeley.edu> wrote:
    Dear All,

    According to last Friday'= s call, we start the thread to discuss the format of management message.=A0=

    Background:
    The management messages are= exchanged between a Management Entity (ME) and 6top, and the ME can be exi= sting in PCE or upper layer of 6top. In some other threads, we have been di= scussing about the control flows and the content of control flows, which ca= n be used as reference.

    Consideration:
    (1) Where the format will be u= sed? IMHO, the format, which we are talking about, is only used to express = the exchanged messages, it should not be used in storage like MIB. Thus, Co= mpacting is a process of translating the data in storage format to the data= in message format, and De-compacting is a reverse process. Make sense?
    =A0=A0
    (2) Criteria of evaluation.=A0
    =A0 =A0 -- C= ompact data size
    =A0 =A0 -- Computational complexity of Compactin= g/De-compacting
    =A0 =A0 -- tool is existing or not
    =A0 = =A0 -- .... more?

    (3) Candidates: CBOR, JSON, BSON, and ......
    = =A0
    Any comments and suggestions are welcome.

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --bcaec5216259ff1d6a04e519dbc1-- From twatteyne@gmail.com Thu Aug 29 11:34:27 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6B8A821E80B1 for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 11:34:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MFobbJ0CZWL5 for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 11:34:27 -0700 (PDT) Received: from mail-pa0-x22c.google.com (mail-pa0-x22c.google.com [IPv6:2607:f8b0:400e:c03::22c]) by ietfa.amsl.com (Postfix) with ESMTP id 45AD021E80AA for <6tsch@ietf.org>; Thu, 29 Aug 2013 11:34:25 -0700 (PDT) Received: by mail-pa0-f44.google.com with SMTP id fz6so1276428pac.31 for <6tsch@ietf.org>; Thu, 29 Aug 2013 11:34:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=0WrtUt6jdkPZRtPFPDPwVwQGOxw2HAVl/pR6rzOmwNY=; b=YfdqDaS0hS8b8fvHA7+palaVoqLfKnwLbtJIy9goscm+jbvWY+DYgXfp6IalS8dcWu UlGM2bPK4vF1eGVsAbeOy3qhwdnf83s5tqrQwGk5yQYiwbv7MRkdIw2fGYq3TP0fn1Lw Bmq2U33r1GkoGWlVxNXpY5LnXPT7DtPoSzCMF1aCbeDv5HpusEpMp5w2POCXDXF+jADD W3XbG3HL8I6FZ9r2gQaNT54Pp0mZgF7RIn+UEvN2NWVkxPpylvirm5YdQwVVlb99D7kh eg2ugpm4OpyFrRBAjHvZAYaLds+3lQrYjDq3wHp7TKUvfR83esaNQG7Ngi6JJY8RejgI WMqw== X-Received: by 10.68.98.101 with SMTP id eh5mr5281438pbb.65.1377801264709; Thu, 29 Aug 2013 11:34:24 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Thu, 29 Aug 2013 11:34:04 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680D@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661E@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680D@EXMBX23.ad.utwente.nl> From: Thomas Watteyne Date: Thu, 29 Aug 2013 11:34:04 -0700 X-Google-Sender-Auth: hWiUeDjbSHqyTf6MUgOSnJJ3Ric Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/related; boundary=047d7b6dd100f4487504e51a5a07 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 18:34:27 -0000 --047d7b6dd100f4487504e51a5a07 Content-Type: multipart/alternative; boundary=047d7b6dd100f4487204e51a5a06 --047d7b6dd100f4487204e51a5a06 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Pouria, I see your points, which deal with neighbor discovery, right? IMO, there is no problem to have both 6top and RPL add neighbors to the neighbor table. In fact, one can consider the neighbor table to be some data source managed jointly by L2 and L3. Some "columns" can be L2-specific (e.g. packet counters), some L3-specific (e.g. rank). To discover more neighbor, do you see an advantage of listening after having synchronized, rather than listening longer at the beginning of the join process? Thomas On Wed, Aug 28, 2013 at 11:53 AM, wrote: > Thomas,**** > > The changes are:**** > > **1. **Considering more time for 6top and MAC to discover more > potential neighbor and update their statistic in *neighbor table*, before > starting RPL.**** > > **2. **The RPL might consider the neighbor statistics in 6top as > well as parent rank to select the parent. So, RPL will ask 6top about the > local statistics in the *neighbor table* by calling =93read statistic > request=94.**** > > **3. ** Changing the time source information in 6top and MAC, upon > selecting the new parent.**** > > I think you mean the first change. I am right?**** > > I can remove that part.**** > > Pouria **** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Wednesday, August 28, 2013 8:25 PM > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Pouria,**** > > ** ** > > Wonderful diagram, great material to discuss over!**** > > ** ** > > I don't quite understand the changes you made in the second revision. In > my mind, the first revision was better:**** > > - node A initiates a network join procedure**** > > - it receives some EBs**** > > - after some settable time, it uses some settable algorithm to pick a tim= e > source neighbor**** > > - it keeps synchronized to that neighbor until told otherwise. No routing > information yet.**** > > - either it sends in a DIS, or waits, but in any case it receives DIOs > from its neighbors**** > > - RPL works exactly as-is, and pick routing parent(s).**** > > - TSCH snoops on RPL's decision and changes time source neighbors > accordingly.**** > > ** ** > > Does that sum it up?**** > > ** ** > > Thomas**** > > ** ** > > On Wed, Aug 28, 2013 at 11:14 AM, wrote:**** > > Hi Qin,**** > > It absolutely makes sense.**** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Wednesday, August 28, 2013 7:21 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > **** > > I proposed adding "Change time source" along with "Choosing the RPL > parent" because we agreed before that the RPL parent will be used as the > time source. And, this time Xavi proposed to use the node with lowest EB' > join priority as time source is just because the RPL parent hasn't been > found at the beginning. **** > > **** > > Make sense?**** > > **** > > Qin**** > > **** > > **** > > **** > > **** > > On Thu, Aug 29, 2013 at 12:52 AM, wrote:**** > > Hi Qin,**** > > I changed the diagram based on your comment.**** > > However, I couldn=92t conclude form the discussion on =93time parent sele= ction > based on EB priority=94 thread to find out, if L3 will make the final > decision about the time source or L2.**** > > Best Wishes,**** > > Pouria**** > > **** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Wednesday, August 28, 2013 5:31 PM > *To:* Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > **** > > It is great to have the diagram as common base to discuss. I would like t= o > add "Changing time source" along with "Choosing the RPL parent", because > the time source selected at the beginning is just a temporary one, and ti= me > source in L2 should be same as the RPL parent in L3 after RPL parent is > selected.**** > > **** > > make sense?**** > > **** > > Qin**** > > **** > > **** > > On Wed, Aug 28, 2013 at 7:55 PM, wrote:**** > > Dear All,**** > > I would like to continue our discussion for choosing the time source > (either in L2 or L3) in the basic RPL. **** > > I prepared a sample of message sequence chart to show the potential > procedure for basic RPL.**** > > I think we can refer to or modify the attached slide to discuss the > details for constructing the basic RPL, as well as choosing the time sour= ce. > **** > > Best Wishes,**** > > Pouria **** > > **** > > **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Wednesday, August 21, 2013 7:45 AM**** > > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria,**** > > Glad to read we agree!**** > > Thomas**** > > **** > > On Tue, Aug 20, 2013 at 12:53 PM, wrote:**** > > Thomas,**** > > **** > > Many thanks for your explanation.**** > > I couldn=92t find the related counter in MAC PIB of IEEE 802.15.4.**** > > **** > > My first idea was using both (a) clock accuracy information and (b) RPL > rank information for choosing the best timing parent between two routers > with equal (or close) RPL rank. That would help us to avoid (1) > synchronization loop problem and (2) potential drifting problem caused by > choosing the parent, between two with equal ranks but not equal clock > accuracy.**** > > **** > > As you mentioned, let=92s not make it complicated and consider the parent > rank as a factor for choosing the timing parent.**** > > **** > > Pouria.**** > > **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Tuesday, August 20, 2013 7:54 AM**** > > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria,**** > > Thanks for the explanation. Allow me to answer inline.**** > > Thomas**** > > **** > > On Mon, Aug 19, 2013 at 10:57 AM, wrote:**** > > Thomas,**** > > **** > > I am not expert in synchronization, so please bear with me.**** > > **** > > By clock accuracy information, I mean how accurate a node can maintain > (e.g. =B11 ms) synchronization in the network for a period of time (e.g. = 20 > s) without the need for clock update. Different devices might have > different clock accuracy values represent by parts per million (ppm) unit= . > The clock accuracy of a device might depend on the device=92 environment > conditions (e.g. temperature or shocks) and it doesn=92t just depend on > crystals hardware. Am I right?**** > > **** > > Agreed. I am used to the term "clock drift" for the phenomenon, but > absolutely, drift depends on manufacturing, voltage, temperature, and > probably other environmental factors. The amount of drift of your clock > source will dictate how often resynchronization needs to happen, given a > guard time (i.e. 1ms). Of course, all these parameters depend on each > other, so you can imagine buying a better clock source, or changing the > re-synchronization frequency, or changing the guard time.**** > > **** > > In the centralized approach, the System/Network managers, use (L2) > device clock accuracy information as well as (L3) nodes=92 topology > information (similar to node=92s rank in RPL in 6tsch distributed approac= h) > to select the potential clock sources in the network. Am I right? **** > > **** > > Hmm. I understand what you are proposing, but my first reaction is to be = a > bit afraid that basing time source neighbor selection on clock drift > information might lead to lots of complexity, for not much gain (I think)= . > If I am drifting a lot wrt to my neighbor, could I not resolve that local= ly > (through all kind of techniques we can think of), rather than involving t= he > time source neighbor selection process in that?**** > > **** > > In a distributed approach, a network device might inform their > neighbors about its (L2) clock accuracy. A new device might use this > information, as well as L3 parameters (e.g. sender RPL=92 rank), to choos= e > its timing parent.**** > > **** > > This would certainly invert the approach. Now, we let RPL select routing > parents, and then we have TSCH just use the same. If we go the other way > around, i.e. select time source neighbors, then routes, many things will > get complicated real quick, the first of which are synchronization loops.= * > *** > > **** > > If in 6tsch, we are considering the case that all the nodes in the > network have equal high clock accuracy, then let=92s consider (L3) router= =92s > rank, based on the *default OF* (as Raghuram suggest), as the only factor > for selecting timing parent.**** > > **** > > I would go that route, but maybe you have some counter example in mind?*= * > ** > > **** > > Pouria**** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Monday, August 19, 2013 4:28 AM > *To:* 6TSCH**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria, all,**** > > **** > > My 2c is the following. We already agreed on the fact that a mote's (RPL) > routing parent would also be its (TSCH) time source neighbor. So why not > pick the time source neighbor based on routing information?**** > > **** > > What exactly do you mean by clock accuracy? All nodes in a TSCH network > need to be able to synchronize with one another, and I don't think we are > considering cases where that is not true.**** > > **** > > Thomas**** > > **** > > On Thu, Aug 15, 2013 at 3:07 PM, wrote:**** > > Raghuram,**** > > I agree with you that we need a method to pick a timing parent.**** > > We might need the L3 information on that, unless we can find a solution i= n > 6top to use L2 information. For example about the clock accuracy > capabilities of the device who has already joined the network. I am not > sure if this information is available in L2 and neighbor table.**** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] > *Sent:* Wednesday, August 14, 2013 12:57 AM > *To:* xvilajosana@eecs.berkeley.edu; Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org; Qin Wang**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Xavi, Pouria,**** > > I think we need to keep node rank at 6top (as a read only parameter > obtained from L3) in order for the TSCH nodes to figure out the timing > parent. In the case where RPL node may have different ranks based on > different OFs we need a method to pick a timing parent.**** > > **** > > We should propose a default OF, that is used to compute the ranks for the > purpose finding the timing parent.**** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: * > *Date: *Tuesday, August 13, 2013 2:27 PM > *To: *Pouria Zand > *Cc: *Thomas Watteyne , "6tsch@ietf.org" < > 6tsch@ietf.org>, Qin Wang > *Subject: *Re: [6tsch] RPL on Basic**** > > **** > > Good point :-)**** > > agreed! > X**** > > **** > > On Tue, Aug 13, 2013 at 2:20 PM, wrote:**** > > Xavi,**** > > **** > > I guess we cannot keep =93node rank=94 in the 6top. Because a node might = have > different rank based on different metrics defined in L3. As a response, I > don=92t think we can get all of those information form L3 and use them in > neighbor table in 6top. Am I right? **** > > I think, as you mentioned we need to work on them. **** > > **** > > Pouria **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 11:13 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria, > > yes the neighbor table is something that 6top takes care of. The fields o= f > the table is something that we need to work on, stats for sure as describ= ed > by the basic configuration draft. As regards to the rank, in our > implementation, we keep it in the table, for each neighbour we keep its > rank. This information can be placed somewhere else if you want but I gue= ss > we need it to keep some sense on what is the rank of our neighbors.**** > > regards,**** > > Xavi**** > > **** > > **** > > On Tue, Aug 13, 2013 at 2:05 PM, wrote:**** > > Xavi,**** > > **** > > Many thanks for your complete explanation. It absolutely makes sense.**** > > **** > > Just one minor question. The neighbor table will be stored in 6top. Am I > right? If yes, do we need to store rank information (included in DIO) in > that table? Or we just store neighbor statistic?**** > > **** > > Pouria **** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 10:17 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > answer inline:**** > > Xavi,**** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > there are many different ways to implement that, this is an option.**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI?**** > > These are the list of known neighbors with acceptable RSSI, so yes if it > wants to keep all of them.**** > > Or (2) the node should probe its connection with the its RPL parent and > its RPL child? In the case (2), how does the 6top can inform the L3 about > the new potential discovered neighbors and their connection status? **** > > When a node is discovered due to receiving and EB (at least in our openws= n > implementation), it is inserted at the neighbor table. At that point no > information about connectivity can be used except RSSI. As soon as a DIO = is > received from that node, its information is updated (including rank). As = we > don't have any information about connectivity (as RFC6552 describes) an > initial value is set (i.e rank + FOO). In openwsn a similar case to (1) i= s > used so eventually some stats of the link can be used to compute the ETX > and let RPL do its work. **** > > So RPL knows about a new node because 6TOP keeps information of neighbors > an eventually this information is used by RPL to update routes. As this > node sends DIOs and receives DIOs from others the information is > permanently being updated enabling a node to be positioned in the multiho= p > topology.**** > > Does it make sense?**** > > Pouria**** > > **** > > On Tue, Aug 13, 2013 at 12:40 PM, wrote:**** > > Xavi,**** > > **** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > **** > > Pouria**** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > **** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:*6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --047d7b6dd100f4487204e51a5a06 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Pouria,

    I see your points, which deal w= ith neighbor discovery, right? IMO, there is no problem to have both 6top a= nd RPL add neighbors to the neighbor table. In fact, one can consider the n= eighbor table to be some data source managed jointly by L2 and L3. Some &qu= ot;columns" can be L2-specific (e.g. packet counters), some L3-specifi= c (e.g. rank).

    To discover more neighbor, do you see an advantage of l= istening after having synchronized, rather than listening longer at the beg= inning of the join process?

    Thomas


    On Wed, Aug 2= 8, 2013 at 11:53 AM, <P.Zand@utwente.nl> wrote:

    Thomas,

    The changes are:

    1.=A0=A0=A0=A0=A0=A0 Considering more time for 6top and MAC to discover more potential neig= hbor and update their statistic in neighbor table, before starting RPL.

    2.=A0=A0=A0=A0=A0=A0 The RPL might consider the neighbor statistics in 6top as well as pare= nt rank to select the parent. So, RPL will ask 6top about the local statistics in the neighbor table by calling =93read stati= stic request=94.

    3.=A0=A0=A0=A0=A0=A0 =A0Changing the time source information in 6top and MAC, upon selectin= g the new parent.

    I think you mean the firs= t change. I am right?

    I can remove that part.

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 28, 2013 8:25 PM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    =A0

    Wonderful diagram, great material to discuss over!

    =A0

    I don't quite understand the changes you made in= the second revision. In my mind, the first revision was better:<= /u>

    - node A initiates a network join procedure

    - it receives some EBs

    - after some settable time, it uses some settable al= gorithm to pick a time source neighbor

    - it keeps synchronized to that neighbor until told = otherwise. No routing information yet.

    - either it sends in a DIS, or waits, but in any cas= e it receives DIOs from its neighbors

    - RPL works exactly as-is, and pick routing parent(s= ).

    - TSCH snoops on RPL's decision and changes time= source neighbors accordingly.

    =A0

    Does that sum it up?

    =A0

    Thomas

    =A0

    On Wed, Aug 28, 2013 at 11:14 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,<= /u>

    It absolutely makes sense= .

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Wednesday, August 28, 2013 7:21 PM


    To: Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    =A0

    I proposed adding "Change time source" alo= ng with "Choosing the RPL parent" because we agreed before that t= he RPL parent will be used as the time source. And, this time Xavi proposed to use the node with lowest EB' join priority as time source is just b= ecause the RPL parent hasn't been found at the beginning.=A0<= /u>

    =A0

    Make sense?

    =A0

    Qin

    =A0

    =A0

    =A0

    =A0

    On Thu, Aug 29, 2013 at 12:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,<= /u>

    I changed the diagram bas= ed on your comment.

    However, I couldn=92t con= clude form the discussion on =93time parent selection based on EB priority= =94 thread to find out, if L3 will make the final decision about the time sour= ce or L2.

    Best Wishes,

    Pouria

    =

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Wednesday, August 28, 2013 5:31 PM
    To: Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    =A0

    It is great to have the diagram as common base to di= scuss. I would like to add "Changing time source" along with &quo= t;Choosing the RPL parent", because the time source selected at the beginning is just a temporary one, and time source in L2 should be same as= the RPL parent in L3 after RPL parent is selected.

    =A0

    make sense?

    =A0

    Qin

    =A0

    =A0

    On Wed, Aug 28, 2013 at 7:55 PM, <P.Zand@utwente.nl> wrote:=

    Dear All,

    I would like to continue = our discussion for choosing the time source (either in L2 or L3) in the basic RPL.

    I prepared a sample of me= ssage sequence chart to show the potential procedure for basic RPL.<= u>

    I think we can refer to o= r modify the attached slide to discuss the details for constructing the basic RPL, as well as choosing the time source.

    Best Wishes,

    Pouria =A0<= u>

    <= u>

    =A0<= /p>

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 21, 2013 7:45 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    Glad to read we agree!

    Thomas

    =A0

    On Tue, Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,<= /u>

    =A0<= /p>

    Many thanks for your expl= anation.

    I couldn=92t find the rel= ated counter in MAC PIB of IEEE 802.15.4.

    =A0<= /p>

    My first idea was using b= oth (a) clock accuracy information and (b) RPL rank information for choosin= g the best timing parent between two routers with equal (or close) RPL rank.= That would help us to avoid (1) synchronization loop problem and (2) poten= tial drifting problem caused by choosing the parent, between two with equal= ranks but not equal clock accuracy.

    =A0<= /p>

    As you mentioned, let=92s= not make it complicated and consider the parent rank as a factor for choos= ing the timing parent.

    =A0<= /p>

    Pouria.<= /u>

    =A0=A0=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    Thanks for the explanation. Allow me to answer inlin= e.

    Thomas

    =A0

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,<= /u>

    =A0<= /p>

    I am not expert in synchr= onization, so please bear with me.

    =A0<= /p>

    By clock accuracy informa= tion, I mean how accurate a node can maintain (e.g. =B11 ms) synchronizatio= n in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device=92 environment conditions (e.g. temperature or shocks) and it doesn=92t just depend on cr= ystals hardware. Am I right?

    =A0

    Agreed. I am used to the term "clock drift"= ; for the phenomenon, but absolutely, drift depends on manufacturing, volta= ge, temperature, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronizat= ion needs to happen, given a guard time (i.e. 1ms). Of course, all these pa= rameters depend on each other, so you can imagine buying a better clock sou= rce, or changing the re-synchronization frequency, or changing the guard time.

    =A0

    =A0In the centralized app= roach, the System/Network managers, use (L2) device clock accuracy informat= ion as well as (L3) nodes=92 topology information (similar to node=92s rank in= RPL in 6tsch distributed approach) to select the potential clock sources i= n the network. Am I right?=A0

    =A0

    Hmm. I understand what you are proposing, but my fir= st reaction is to be a bit afraid that basing time source neighbor selectio= n on clock drift information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my = neighbor, could I not resolve that locally (through all kind of techniques = we can think of), rather than involving the time source neighbor selection = process in that?

    =A0

    =A0In a distributed appro= ach, a network device might inform their neighbors about its (L2) clock acc= uracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL=92 rank), to choose its timing parent.

    =A0

    This would certainly invert the approach. Now, we le= t RPL select routing parents, and then we have TSCH just use the same. If w= e go the other way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the f= irst of which are synchronization loops.

    =A0

    =A0If in 6tsch, we are co= nsidering the case that all the nodes in the network have equal high clock accuracy, then let=92s consider (L3) router=92s rank, based on the defa= ult OF (as Raghuram suggest), as the only factor for selecting timing p= arent.

    =A0<= /p>

    I would go that route, but maybe you have some count= er example in mind?

    =A0

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria, all,

    =A0

    My 2c is the following. We already agreed on the fac= t that a mote's (RPL) routing parent would also be its (TSCH) time sour= ce neighbor. So why not pick the time source neighbor based on routing information?

    =A0

    What exactly do you mean by clock accuracy? All node= s in a TSCH network need to be able to synchronize with one another, and I = don't think we are considering cases where that is not true.

    =A0

    Thomas

    =A0

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:=

    Raghuram,

    I agree with you that we need a method = to pick a timing parent.

    We might need the L3 information on tha= t, unless we can find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Raghuram= Sudhaakar (rsudhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Xavi, Pouria,

    I think we need to keep node rank at 6t= op (as a read only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

    =A0

    We should propose a default OF, that is= used to compute the ranks for the purpose finding the timing parent.

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Good poi= nt :-)

    agreed!
    X

    =A0

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl&= gt; wrote:

    Xavi,

    =A0<= /p>

    I guess we cannot keep = =93node rank=94 in the 6top. Because a node might have different rank based= on different metrics defined in L3. As a response, I don=92t think we can get= all of those information form L3 and use them in neighbor table in 6top. A= m I right?

    I think, as you mentioned= we need to work on them.

    =A0<= /p>

    Pouria =A0<= u>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

    =A0

    =A0

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:=

    Xavi,

    =A0<= /p>

    Many thanks for your comp= lete explanation. It absolutely makes sense.

    =A0<= /p>

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    answer inline:=

    Xavi,

    Keep Alive timer expires for =93node A=94 aft= er 30s if no frames have been sent (or received) to (or from) neighbor =93n= ode B=94. Am I right?

    there are many different ways to implement that, this is an= option.

    =A0

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about con= nectivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

    =A0

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or from) neighbor =93node B=94. Am I right?

    =A0<= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status? =A0=A0=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the= following way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.=

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From:6tsch-bounces@ietf.org= [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchron= ized with its RPL parent. In the absence of traffic, the node will periodic= ally "keep alive" (per Xavi's e-mail) to the parent. How ofte= n depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:<= u>

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function = calculation using Neighbors information described in Basic configuration.

    =A0=A0=A0 -this includes= how OF is calculated using numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing m= ode vs non-storing mode (I vote for non-storing mode for a basic configurat= ion)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


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    =A0


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    =A0

    =A0

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    =A0

    =A0

    =A0

    =A0


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    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


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Content-Type: multipart/alternative; boundary=001a11331e46967f8f04e51a7628 Cc: Maria Rita PALATTELLA , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang , "xvilajosana@eecs.berkeley.edu" , "JP Vasseur \(jvasseur\)" Subject: Re: [6tsch] Dynamic slot activation (was part of the 4th control flow) X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 18:42:14 -0000 --001a11331e46967f8f04e51a7628 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable +1 Rather than "basic", let's talk about "minimal 6TiSCH Configuration", i.e. the title of the draft. Xavi agreed a couple of calls ago to rename "draft-vilajosana-6tsch-basic" to "draft-vilajosana-6tisch-minimal" Thomas On Thu, Aug 29, 2013 at 2:16 AM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Hello Xavi and Qin:**** > > ** ** > > I=92m not sure we want to continue this discussion now or keep it for > later, but either way I=92m making it a separate thread to save the curre= nt > conclusions.**** > > ** ** > > In short, Thomas below asked:**** > > ** ** > > *Thomas> over what cells with the reports travel? Another questions could > be: over what cells will the request to install cells travel?* > > ** ** > > This is a good question and at the same time this is not really something > that we have to answer right now, per our proposed charter, as Xavi > indicates:**** > > *Xavi> I think it is better first to concentrate on the basic things* > > ** ** > > On the side I think the use of the word =91basic=92 these days could crea= te > confusion since it seems to refer to draft-vilajosana-6tsch-basic which i= s > probably not Xavi=92s intention here.**** > > I=92d suggest that when we refer to the operation in the > draft-vilajosana-6tsch-basic draft, we call it something like =93Basic > 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word =93b= asic=94 may > not be confusing anymore.**** > > ** ** > > For this particular thread, I suggested as an answer to Thomas that 1) I > agree that in the future the control flows could travel over a Basic 6TiS= CH > instance, and in that case 2) that we could probably handle burstiness of > control traffic by overprovisioning time slots and then indicating > dynamically which extra time slots are being used; as Qin puts it very > clearly:**** > > *Qin> Over-provision can increase the throughput at peak time, while the > control bits can reduce the energy consumption for idle-listening (at lea= st > at the beginning of slot) in those unused Tx/Rx cells.* > > I was thinking of something like a =91more=92 bit in a cell the is being = used > in order to tell listeners to wake up in the next overprovisionned cell, = as > opposed to a bit sent at the beginning of the overprovisionned cell that > would indicate that the cell is not being used, though. Xavi agrees that = it > *Xavi> sounds to me a great idea***** > > ** ** > > To make sure that we do not make a confusion between 1) the bits that > control the use of overprovisionned cells in a bundle and that are pigy > backed with the traffic to indicate there is more trafficoutstanding and = 2) > the end to end protocol that controls the allocation of cells between a > controlling entity and the device, or between devices, JP insisted that t= he > control flows for the latter (which are the subject of the original threa= d > by Qin) should be cleanly defined and that we should not expect to piggy > back them with traffic:**** > > *JP> I would just be vary cautious when thinking of piggybacking control > information in packet header for control plane purpose*** > > ** ** > > With this summary, it is up to us to continue the discussion or save it > for later. Should we continue, I suggest we do it in the context of Basic > 6TiSCH to see if that mode could benefit from over-provisioned time slots > but then provide a way to use only a subset of those slots. This would > probably make Basic 6TiSCH a lot more useful in the future for applicatio= ns > of various scales and degrees of burstiness.**** > > ** ** > > Cheers,**** > > ** ** > > Pascal**** > --001a11331e46967f8f04e51a7628 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    +1

    Rather than "basic", let&#= 39;s talk about "minimal 6TiSCH Configuration", i.e. the title of= the draft.

    Xavi agreed a couple of calls ago to r= ename "draft-vilajosana-6tsch-basic" to "draft-vilajosana-6t= isch-minimal"

    Thomas


    On Thu, Aug 29, 2013 at 2:16 AM, Pascal Thubert (p= thubert) <pthubert@cisco.com> wrote:

    Hello Xavi and Qin:

    =A0<= /p>

    I=92m not sure we want=A0= to continue this discussion now or keep it for later, but either way I=92m= making it a separate thread to save the current conclusions.=

    =A0<= /p>

    In short, Thomas below as= ked:

    =A0<= /p>

    Thomas> over what c= ells with the reports travel? Another questions could be: over what cells w= ill the request to install cells travel?

    =A0<= /p>

    This is a good question a= nd at the same time this is not really something that we have to answer rig= ht now, per our proposed charter, as Xavi indicates:

    Xavi> I think it is= better first to concentrate on the basic things

    =A0<= /p>

    On the side I think the u= se of the word =91basic=92 these days could create confusion since it seems= to refer to draft-vilajosana-6tsch-basic which is probably not Xavi=92s intention here.

    I=92d suggest that when w= e refer to the operation in the draft-vilajosana-6tsch-basic draft, we call= it something like =93Basic 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word =93basic=94 may not be confusing anymore.<= /u>

    =A0<= /p>

    For this particular threa= d, I suggested as an answer to Thomas that 1) I agree that in the future th= e control flows could travel over a Basic 6TiSCH instance, and in that case 2) that we could probably handle burstiness of control tr= affic by overprovisioning time slots and then indicating dynamically which = extra time slots are being used; as Qin puts it very clearly:=

    Qin> Over-provision= can increase the throughput at peak time, while the control bits can reduc= e the energy consumption for idle-listening (at least at the beginning of slot) in those unused Tx/Rx cells.

    I was thinking of somethi= ng like a =91more=92 bit in a cell the is being used in order to tell liste= ners to wake up in the next overprovisionned cell, as opposed to a bit sent at the beginning of the overprovisionned cell that would ind= icate that the cell is not being used, though. Xavi agrees that it Xavi> sounds to me a great idea

    =A0<= /p>

    To make sure that we do n= ot make a confusion between 1) the bits that control the use of overprovisi= onned cells in a bundle and that are pigy backed with the traffic to indicate there is more trafficoutstanding and 2) the end to end= protocol that controls the allocation of cells between a controlling entit= y and the device, or between devices, JP insisted that the control flows fo= r the latter (which are the subject of the original thread by Qin) should be cleanly defined and that we shoul= d not expect to piggy back them with traffic:

    JP> I would just be= vary cautious when thinking of piggybacking control information in packet = header for control plane purpose

    =A0=

    With this summary, it is = up to us to continue the discussion or save it for later. Should we continu= e, I suggest we do it in the context of Basic 6TiSCH to see if that mode could be= nefit from over-provisioned time slots but then provide a way to use only a= subset of those slots. This would probably make Basic 6TiSCH a lot more useful in the future for applications of various scales = and degrees of burstiness.<= /span>

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal


    --001a11331e46967f8f04e51a7628-- From xvilajosana@berkeley.edu Thu Aug 29 12:00:27 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A5B8121E80BD for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 12:00:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.682 X-Spam-Level: X-Spam-Status: No, score=-2.682 tagged_above=-999 required=5 tests=[AWL=0.294, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZpD1tO1jic3b for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 12:00:21 -0700 (PDT) Received: from mail-pb0-f50.google.com (mail-pb0-f50.google.com [209.85.160.50]) by ietfa.amsl.com (Postfix) with ESMTP id 8EFC721E8091 for <6tsch@ietf.org>; Thu, 29 Aug 2013 12:00:21 -0700 (PDT) Received: by mail-pb0-f50.google.com with SMTP id uo5so849757pbc.9 for <6tsch@ietf.org>; Thu, 29 Aug 2013 12:00:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=T1Cy2hposb49R/x+tvbY5rarIX7/uXlGn6lylB53hvY=; b=b60FWju2AxEMe6cgnbEs2LhXs+D0jl/B8o/mgiHhHEGZPGE0l8wj7PR3925KoKVdGd UFZ4AQK0qdZR5XeJ8YTqRvaEF4f6QJTGs5PSbASZa0W0WxMHFuSR1y/wtbPBS2cZ6IBQ 98gopBkRk6zWJ1oEmAD8XGqTJwpgpeCORLHoWvUYXfzj81W/j/7y0fXHbaUpR0HbWdwU LcoiUZgnsRgvBckGCjJuBISMN1DHdZdik/VvGu5i+CpyDSnDbzg1HLvUNnrFhgZOM6aL +sW3YeohKlu7/Bget0wtzi7GS/iWn2qIMh3VlJebKts6dg0FQpbNJS/89CZpIViOwdel yDig== X-Gm-Message-State: ALoCoQlQrYkzkkhA5LkfMS76DRD0+vs1I9fU5fTtNcFnggDqU1YG0XRcal7Kdf7BAM073xZTFpoS MIME-Version: 1.0 X-Received: by 10.67.1.41 with SMTP id bd9mr6105141pad.116.1377802821114; Thu, 29 Aug 2013 12:00:21 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Thu, 29 Aug 2013 12:00:21 -0700 (PDT) In-Reply-To: References: Date: Thu, 29 Aug 2013 12:00:21 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7b15fbdfb947da04e51ab7b7 Cc: Maria Rita PALATTELLA , "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang , "JP Vasseur \(jvasseur\)" Subject: Re: [6tsch] Dynamic slot activation (was part of the 4th control flow) X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 19:00:27 -0000 --047d7b15fbdfb947da04e51ab7b7 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Yes I do, the next revision will be a new draft with 6TiSCH and Minimal... and then no more naming issues!! :) X On Thu, Aug 29, 2013 at 11:41 AM, Thomas Watteyne < watteyne@eecs.berkeley.edu> wrote: > +1 > > Rather than "basic", let's talk about "minimal 6TiSCH Configuration", i.e= . > the title of the draft. > > Xavi agreed a couple of calls ago to rename "draft-vilajosana-6tsch-basic= " > to "draft-vilajosana-6tisch-minimal" > > Thomas > > > On Thu, Aug 29, 2013 at 2:16 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote: > >> Hello Xavi and Qin:**** >> >> ** ** >> >> I=92m not sure we want to continue this discussion now or keep it for >> later, but either way I=92m making it a separate thread to save the curr= ent >> conclusions.**** >> >> ** ** >> >> In short, Thomas below asked:**** >> >> ** ** >> >> *Thomas> over what cells with the reports travel? Another questions >> could be: over what cells will the request to install cells travel?* >> >> ** ** >> >> This is a good question and at the same time this is not really somethin= g >> that we have to answer right now, per our proposed charter, as Xavi >> indicates:**** >> >> *Xavi> I think it is better first to concentrate on the basic things* >> >> ** ** >> >> On the side I think the use of the word =91basic=92 these days could cre= ate >> confusion since it seems to refer to draft-vilajosana-6tsch-basic which = is >> probably not Xavi=92s intention here.**** >> >> I=92d suggest that when we refer to the operation in the >> draft-vilajosana-6tsch-basic draft, we call it something like =93Basic >> 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word =93= basic=94 may >> not be confusing anymore.**** >> >> ** ** >> >> For this particular thread, I suggested as an answer to Thomas that 1) I >> agree that in the future the control flows could travel over a Basic 6Ti= SCH >> instance, and in that case 2) that we could probably handle burstiness o= f >> control traffic by overprovisioning time slots and then indicating >> dynamically which extra time slots are being used; as Qin puts it very >> clearly:**** >> >> *Qin> Over-provision can increase the throughput at peak time, while the >> control bits can reduce the energy consumption for idle-listening (at le= ast >> at the beginning of slot) in those unused Tx/Rx cells.* >> >> I was thinking of something like a =91more=92 bit in a cell the is being= used >> in order to tell listeners to wake up in the next overprovisionned cell,= as >> opposed to a bit sent at the beginning of the overprovisionned cell that >> would indicate that the cell is not being used, though. Xavi agrees that= it >> *Xavi> sounds to me a great idea***** >> >> ** ** >> >> To make sure that we do not make a confusion between 1) the bits that >> control the use of overprovisionned cells in a bundle and that are pigy >> backed with the traffic to indicate there is more trafficoutstanding and= 2) >> the end to end protocol that controls the allocation of cells between a >> controlling entity and the device, or between devices, JP insisted that = the >> control flows for the latter (which are the subject of the original thre= ad >> by Qin) should be cleanly defined and that we should not expect to piggy >> back them with traffic:**** >> >> *JP> I would just be vary cautious when thinking of piggybacking control >> information in packet header for control plane purpose*** >> >> ** ** >> >> With this summary, it is up to us to continue the discussion or save it >> for later. Should we continue, I suggest we do it in the context of Basi= c >> 6TiSCH to see if that mode could benefit from over-provisioned time slot= s >> but then provide a way to use only a subset of those slots. This would >> probably make Basic 6TiSCH a lot more useful in the future for applicati= ons >> of various scales and degrees of burstiness.**** >> >> ** ** >> >> Cheers,**** >> >> ** ** >> >> Pascal**** >> > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b15fbdfb947da04e51ab7b7 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Yes I do, the next revision will be a new draft with 6TiSC= H and Minimal... and then no more naming issues!!

    :)

    X


    On Thu, Au= g 29, 2013 at 11:41 AM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:
    +1

    Rathe= r than "basic", let's talk about "minimal 6TiSCH Configu= ration", i.e. the title of the draft.

    Xavi agreed a couple of calls ago to rename "draft= -vilajosana-6tsch-basic" to "draft-vilajosana-6tisch-minimal"= ;

    Thomas
    <= div class=3D"h5">


    On Thu, Aug 29, 2013 at 2:16 AM, Pascal Thubert (pthubert) <pthubert@= cisco.com> wrote:

    Hello Xavi and Qin:

    =A0<= /p>

    I=92m not sure we want=A0= to continue this discussion now or keep it for later, but either way I=92m= making it a separate thread to save the current conclusions.=

    =A0<= /p>

    In short, Thomas below as= ked:

    =A0<= /p>

    Thomas> over what c= ells with the reports travel? Another questions could be: over what cells w= ill the request to install cells travel?

    =A0<= /p>

    This is a good question a= nd at the same time this is not really something that we have to answer rig= ht now, per our proposed charter, as Xavi indicates:

    Xavi> I think it is= better first to concentrate on the basic things

    =A0<= /p>

    On the side I think the u= se of the word =91basic=92 these days could create confusion since it seems= to refer to draft-vilajosana-6tsch-basic which is probably not Xavi=92s intention here.

    I=92d suggest that when w= e refer to the operation in the draft-vilajosana-6tsch-basic draft, we call= it something like =93Basic 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word =93basic=94 may not be confusing anymore.<= /u>

    =A0<= /p>

    For this particular threa= d, I suggested as an answer to Thomas that 1) I agree that in the future th= e control flows could travel over a Basic 6TiSCH instance, and in that case 2) that we could probably handle burstiness of control tr= affic by overprovisioning time slots and then indicating dynamically which = extra time slots are being used; as Qin puts it very clearly:=

    Qin> Over-provision= can increase the throughput at peak time, while the control bits can reduc= e the energy consumption for idle-listening (at least at the beginning of slot) in those unused Tx/Rx cells.

    I was thinking of somethi= ng like a =91more=92 bit in a cell the is being used in order to tell liste= ners to wake up in the next overprovisionned cell, as opposed to a bit sent at the beginning of the overprovisionned cell that would ind= icate that the cell is not being used, though. Xavi agrees that it Xavi> sounds to me a great idea

    =A0<= /p>

    To make sure that we do n= ot make a confusion between 1) the bits that control the use of overprovisi= onned cells in a bundle and that are pigy backed with the traffic to indicate there is more trafficoutstanding and 2) the end to end= protocol that controls the allocation of cells between a controlling entit= y and the device, or between devices, JP insisted that the control flows fo= r the latter (which are the subject of the original thread by Qin) should be cleanly defined and that we shoul= d not expect to piggy back them with traffic:

    JP> I would just be= vary cautious when thinking of piggybacking control information in packet = header for control plane purpose

    =A0=

    With this summary, it is = up to us to continue the discussion or save it for later. Should we continu= e, I suggest we do it in the context of Basic 6TiSCH to see if that mode could be= nefit from over-provisioned time slots but then provide a way to use only a= subset of those slots. This would probably make Basic 6TiSCH a lot more useful in the future for applications of various scales = and degrees of burstiness.<= /span>

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b15fbdfb947da04e51ab7b7-- From qinwang@berkeley.edu Thu Aug 29 12:12:00 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3C51311E8153 for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 12:12:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.921 X-Spam-Level: X-Spam-Status: No, score=-2.921 tagged_above=-999 required=5 tests=[AWL=0.055, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id imxF17QD0vRW for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 12:11:55 -0700 (PDT) Received: from mail-vc0-f176.google.com (mail-vc0-f176.google.com [209.85.220.176]) by ietfa.amsl.com (Postfix) with ESMTP id E03DB11E814C for <6tsch@ietf.org>; Thu, 29 Aug 2013 12:11:54 -0700 (PDT) Received: by mail-vc0-f176.google.com with SMTP id ha11so632258vcb.35 for <6tsch@ietf.org>; Thu, 29 Aug 2013 12:11:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=LWmFgNnPD6GDJjJq9UduQBKLMNGRbLF8KULzwZOYJ7g=; b=jMZFroKxtzF2w/3S28FhYz6PhazMhv/crclqO5BDGEkFbDj49rY54vBPEKwRpJjugL Nw7rk5L0ok1nAnoeZAMiOsWcE1L38ZVXjakYhkd1kJa1xDhse5RrvJgd24GUuNj6kNwQ F5CqYmrknzU/e5evFFGFOyUxBKOFD2fDmkebfp8iHS3hxosvmjnOSwRq5fndv/WQS3/G yVQc3A9elH9AQWvAxI2J5xujz/XDjyeos/n3O7KAtEXYC+UxWj7v3T1DPug+Bmh4Om19 BsnET0I8V3oQASb3jw2vEuSdj32vx2RxAcL08yu+1S7wxcctC+o12iOkkUUxqrefw1GK M1XQ== X-Gm-Message-State: ALoCoQmIbh+uff4aMdvksjqE42n81OV7BSRkGMEI8aW5kgB3vGWngCt6J2SMCB/VSdVnvoiVHnRZ MIME-Version: 1.0 X-Received: by 10.58.218.225 with SMTP id pj1mr2511678vec.24.1377803508612; Thu, 29 Aug 2013 12:11:48 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 29 Aug 2013 12:11:48 -0700 (PDT) In-Reply-To: References: Date: Fri, 30 Aug 2013 03:11:48 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7bd7623eb394c204e51ae000 Cc: Maria Rita PALATTELLA , "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" , "JP Vasseur \(jvasseur\)" Subject: Re: [6tsch] Dynamic slot activation (was part of the 4th control flow) X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 19:12:00 -0000 --047d7bd7623eb394c204e51ae000 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Can we just call it "minimal 6TiSCH", instead of "minimal 6TiSCH configuration"? Qin On Fri, Aug 30, 2013 at 2:41 AM, Thomas Watteyne wrote: > +1 > > Rather than "basic", let's talk about "minimal 6TiSCH Configuration", i.e= . > the title of the draft. > > Xavi agreed a couple of calls ago to rename "draft-vilajosana-6tsch-basic= " > to "draft-vilajosana-6tisch-minimal" > > Thomas > > > On Thu, Aug 29, 2013 at 2:16 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote: > >> Hello Xavi and Qin:**** >> >> ** ** >> >> I=92m not sure we want to continue this discussion now or keep it for >> later, but either way I=92m making it a separate thread to save the curr= ent >> conclusions.**** >> >> ** ** >> >> In short, Thomas below asked:**** >> >> ** ** >> >> *Thomas> over what cells with the reports travel? Another questions >> could be: over what cells will the request to install cells travel?* >> >> ** ** >> >> This is a good question and at the same time this is not really somethin= g >> that we have to answer right now, per our proposed charter, as Xavi >> indicates:**** >> >> *Xavi> I think it is better first to concentrate on the basic things* >> >> ** ** >> >> On the side I think the use of the word =91basic=92 these days could cre= ate >> confusion since it seems to refer to draft-vilajosana-6tsch-basic which = is >> probably not Xavi=92s intention here.**** >> >> I=92d suggest that when we refer to the operation in the >> draft-vilajosana-6tsch-basic draft, we call it something like =93Basic >> 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word =93= basic=94 may >> not be confusing anymore.**** >> >> ** ** >> >> For this particular thread, I suggested as an answer to Thomas that 1) I >> agree that in the future the control flows could travel over a Basic 6Ti= SCH >> instance, and in that case 2) that we could probably handle burstiness o= f >> control traffic by overprovisioning time slots and then indicating >> dynamically which extra time slots are being used; as Qin puts it very >> clearly:**** >> >> *Qin> Over-provision can increase the throughput at peak time, while the >> control bits can reduce the energy consumption for idle-listening (at le= ast >> at the beginning of slot) in those unused Tx/Rx cells.* >> >> I was thinking of something like a =91more=92 bit in a cell the is being= used >> in order to tell listeners to wake up in the next overprovisionned cell,= as >> opposed to a bit sent at the beginning of the overprovisionned cell that >> would indicate that the cell is not being used, though. Xavi agrees that= it >> *Xavi> sounds to me a great idea***** >> >> ** ** >> >> To make sure that we do not make a confusion between 1) the bits that >> control the use of overprovisionned cells in a bundle and that are pigy >> backed with the traffic to indicate there is more trafficoutstanding and= 2) >> the end to end protocol that controls the allocation of cells between a >> controlling entity and the device, or between devices, JP insisted that = the >> control flows for the latter (which are the subject of the original thre= ad >> by Qin) should be cleanly defined and that we should not expect to piggy >> back them with traffic:**** >> >> *JP> I would just be vary cautious when thinking of piggybacking control >> information in packet header for control plane purpose*** >> >> ** ** >> >> With this summary, it is up to us to continue the discussion or save it >> for later. Should we continue, I suggest we do it in the context of Basi= c >> 6TiSCH to see if that mode could benefit from over-provisioned time slot= s >> but then provide a way to use only a subset of those slots. This would >> probably make Basic 6TiSCH a lot more useful in the future for applicati= ons >> of various scales and degrees of burstiness.**** >> >> ** ** >> >> Cheers,**** >> >> ** ** >> >> Pascal**** >> > > --047d7bd7623eb394c204e51ae000 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Can we just call it "minimal 6TiSCH", instead of= "minimal 6TiSCH configuration"?=A0

    Qin=A0


    On Fr= i, Aug 30, 2013 at 2:41 AM, Thomas Watteyne <watteyne@eecs.berk= eley.edu> wrote:
    +1

    Rathe= r than "basic", let's talk about "minimal 6TiSCH Configu= ration", i.e. the title of the draft.

    Xavi agreed a couple of calls ago to rename "draft= -vilajosana-6tsch-basic" to "draft-vilajosana-6tisch-minimal"= ;

    Thomas
    <= div class=3D"h5">


    On Thu, Aug 29, 2013 at 2:16 AM, Pascal Thubert (pthubert) <pthubert@= cisco.com> wrote:

    Hello Xavi and Qin:

    =A0<= /p>

    I=92m not sure we want=A0= to continue this discussion now or keep it for later, but either way I=92m= making it a separate thread to save the current conclusions.=

    =A0<= /p>

    In short, Thomas below as= ked:

    =A0<= /p>

    Thomas> over what c= ells with the reports travel? Another questions could be: over what cells w= ill the request to install cells travel?

    =A0<= /p>

    This is a good question a= nd at the same time this is not really something that we have to answer rig= ht now, per our proposed charter, as Xavi indicates:

    Xavi> I think it is= better first to concentrate on the basic things

    =A0<= /p>

    On the side I think the u= se of the word =91basic=92 these days could create confusion since it seems= to refer to draft-vilajosana-6tsch-basic which is probably not Xavi=92s intention here.

    I=92d suggest that when w= e refer to the operation in the draft-vilajosana-6tsch-basic draft, we call= it something like =93Basic 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word =93basic=94 may not be confusing anymore.<= /u>

    =A0<= /p>

    For this particular threa= d, I suggested as an answer to Thomas that 1) I agree that in the future th= e control flows could travel over a Basic 6TiSCH instance, and in that case 2) that we could probably handle burstiness of control tr= affic by overprovisioning time slots and then indicating dynamically which = extra time slots are being used; as Qin puts it very clearly:=

    Qin> Over-provision= can increase the throughput at peak time, while the control bits can reduc= e the energy consumption for idle-listening (at least at the beginning of slot) in those unused Tx/Rx cells.

    I was thinking of somethi= ng like a =91more=92 bit in a cell the is being used in order to tell liste= ners to wake up in the next overprovisionned cell, as opposed to a bit sent at the beginning of the overprovisionned cell that would ind= icate that the cell is not being used, though. Xavi agrees that it Xavi> sounds to me a great idea

    =A0<= /p>

    To make sure that we do n= ot make a confusion between 1) the bits that control the use of overprovisi= onned cells in a bundle and that are pigy backed with the traffic to indicate there is more trafficoutstanding and 2) the end to end= protocol that controls the allocation of cells between a controlling entit= y and the device, or between devices, JP insisted that the control flows fo= r the latter (which are the subject of the original thread by Qin) should be cleanly defined and that we shoul= d not expect to piggy back them with traffic:

    JP> I would just be= vary cautious when thinking of piggybacking control information in packet = header for control plane purpose

    =A0=

    With this summary, it is = up to us to continue the discussion or save it for later. Should we continu= e, I suggest we do it in the context of Basic 6TiSCH to see if that mode could be= nefit from over-provisioned time slots but then provide a way to use only a= subset of those slots. This would probably make Basic 6TiSCH a lot more useful in the future for applications of various scales = and degrees of burstiness.<= /span>

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal



    --047d7bd7623eb394c204e51ae000-- From P.Zand@utwente.nl Thu Aug 29 12:25:44 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8630521F937E for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 12:25:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IkjQJE+2-mNi for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 12:25:44 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id D989021F9B92 for <6tsch@ietf.org>; Thu, 29 Aug 2013 12:25:36 -0700 (PDT) Received: from EXHUB02.ad.utwente.nl (130.89.4.229) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Thu, 29 Aug 2013 21:25:39 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB02.ad.utwente.nl ([130.89.4.229]) with mapi id 14.02.0328.009; Thu, 29 Aug 2013 21:25:35 +0200 From: To: , <6tsch@ietf.org> Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWD//+R/gIAAIcgA///iD4CAABkTAIADNlmggATgRgCAASNqIIAAqJmAgAEGRFCAAImCAIALgp+AgAAhcYCAADXHQP//6M0AAAYJnsD//+HBgP//2gIAgAG6vQD//9TxgA== Date: Thu, 29 Aug 2013 19:25:34 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76D5D@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661E@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680D@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/related; boundary="_005_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76D5DEXMBX23adutwent_"; type="multipart/alternative" MIME-Version: 1.0 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 19:25:44 -0000 --_005_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76D5DEXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76D5DEXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76D5DEXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thomas, Yes, I mean neighbor discovery. "By listening longer at the beginning of the join process", Do you mean dur= ing the scanning procedure? During scanning procedure, the node continuous= ly keeps listening in each channel. Let's say 4 sec on each channel. My poi= nt is, how long it should keep listening (more than 4 sec?) in each channel= to be sure that after scanning 16 channels (16 * 4 seconds), most of the n= eighbor are discovered. If we assume that the advertisement period is 2 sec= onds, by considering the channel hopping of the advertisers, what is the pr= obability of discovering most of the neighbors during join process? Am I missing anything? Best Wishes, Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Thursday, August 29, 2013 8:34 PM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, I see your points, which deal with neighbor discovery, right? IMO, there is= no problem to have both 6top and RPL add neighbors to the neighbor table. = In fact, one can consider the neighbor table to be some data source managed= jointly by L2 and L3. Some "columns" can be L2-specific (e.g. packet count= ers), some L3-specific (e.g. rank). To discover more neighbor, do you see an advantage of listening after havin= g synchronized, rather than listening longer at the beginning of the join p= rocess? Thomas On Wed, Aug 28, 2013 at 11:53 AM, > wrote: Thomas, The changes are: 1. Considering more time for 6top and MAC to discover more potential = neighbor and update their statistic in neighbor table, before starting RPL. 2. The RPL might consider the neighbor statistics in 6top as well as = parent rank to select the parent. So, RPL will ask 6top about the local sta= tistics in the neighbor table by calling "read statistic request". 3. Changing the time source information in 6top and MAC, upon select= ing the new parent. I think you mean the first change. I am right? I can remove that part. Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Wednesday, August 28, 2013 8:25 PM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Wonderful diagram, great material to discuss over! I don't quite understand the changes you made in the second revision. In my= mind, the first revision was better: - node A initiates a network join procedure - it receives some EBs - after some settable time, it uses some settable algorithm to pick a time = source neighbor - it keeps synchronized to that neighbor until told otherwise. No routing i= nformation yet. - either it sends in a DIS, or waits, but in any case it receives DIOs from= its neighbors - RPL works exactly as-is, and pick routing parent(s). - TSCH snoops on RPL's decision and changes time source neighbors according= ly. Does that sum it up? Thomas On Wed, Aug 28, 2013 at 11:14 AM, > wrote: Hi Qin, It absolutely makes sense. Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Wednesday, August 28, 2013 7:21 PM To: Zand, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I proposed adding "Change time source" along with "Choosing the RPL parent"= because we agreed before that the RPL parent will be used as the time sour= ce. And, this time Xavi proposed to use the node with lowest EB' join prior= ity as time source is just because the RPL parent hasn't been found at the = beginning. Make sense? Qin On Thu, Aug 29, 2013 at 12:52 AM, > wrote: Hi Qin, I changed the diagram based on your comment. However, I couldn't conclude form the discussion on "time parent selection = based on EB priority" thread to find out, if L3 will make the final decisio= n about the time source or L2. Best Wishes, Pouria [cid:image001.jpg@01CEA4FC.F4862930] From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Wednesday, August 28, 2013 5:31 PM To: Zand, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, It is great to have the diagram as common base to discuss. I would like to = add "Changing time source" along with "Choosing the RPL parent", because th= e time source selected at the beginning is just a temporary one, and time s= ource in L2 should be same as the RPL parent in L3 after RPL parent is sele= cted. make sense? Qin On Wed, Aug 28, 2013 at 7:55 PM, > wrote: Dear All, I would like to continue our discussion for choosing the time source (eithe= r in L2 or L3) in the basic RPL. I prepared a sample of message sequence chart to show the potential procedu= re for basic RPL. I think we can refer to or modify the attached slide to discuss the details= for constructing the basic RPL, as well as choosing the time source. Best Wishes, Pouria [cid:image002.jpg@01CEA4FC.F4862930] From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Wednesday, August 21, 2013 7:45 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Glad to read we agree! Thomas On Tue, Aug 20, 2013 at 12:53 PM, > wrote: Thomas, Many thanks for your explanation. I couldn't find the related counter in MAC PIB of IEEE 802.15.4. My first idea was using both (a) clock accuracy information and (b) RPL ran= k information for choosing the best timing parent between two routers with = equal (or close) RPL rank. That would help us to avoid (1) synchronization = loop problem and (2) potential drifting problem caused by choosing the pare= nt, between two with equal ranks but not equal clock accuracy. As you mentioned, let's not make it complicated and consider the parent ran= k as a factor for choosing the timing parent. Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Tuesday, August 20, 2013 7:54 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Thanks for the explanation. Allow me to answer inline. Thomas On Mon, Aug 19, 2013 at 10:57 AM, > wrote: Thomas, I am not expert in synchronization, so please bear with me. By clock accuracy information, I mean how accurate a node can maintain (e.g= . =B11 ms) synchronization in the network for a period of time (e.g. 20 s) = without the need for clock update. Different devices might have different c= lock accuracy values represent by parts per million (ppm) unit. The clock a= ccuracy of a device might depend on the device' environment conditions (e.g= . temperature or shocks) and it doesn't just depend on crystals hardware. A= m I right? Agreed. I am used to the term "clock drift" for the phenomenon, but absolut= ely, drift depends on manufacturing, voltage, temperature, and probably oth= er environmental factors. The amount of drift of your clock source will dic= tate how often resynchronization needs to happen, given a guard time (i.e. = 1ms). Of course, all these parameters depend on each other, so you can imag= ine buying a better clock source, or changing the re-synchronization freque= ncy, or changing the guard time. In the centralized approach, the System/Network managers, use (L2) device = clock accuracy information as well as (L3) nodes' topology information (sim= ilar to node's rank in RPL in 6tsch distributed approach) to select the pot= ential clock sources in the network. Am I right? Hmm. I understand what you are proposing, but my first reaction is to be a = bit afraid that basing time source neighbor selection on clock drift inform= ation might lead to lots of complexity, for not much gain (I think). If I a= m drifting a lot wrt to my neighbor, could I not resolve that locally (thro= ugh all kind of techniques we can think of), rather than involving the time= source neighbor selection process in that? In a distributed approach, a network device might inform their neighbors a= bout its (L2) clock accuracy. A new device might use this information, as w= ell as L3 parameters (e.g. sender RPL' rank), to choose its timing parent. This would certainly invert the approach. Now, we let RPL select routing pa= rents, and then we have TSCH just use the same. If we go the other way arou= nd, i.e. select time source neighbors, then routes, many things will get co= mplicated real quick, the first of which are synchronization loops. If in 6tsch, we are considering the case that all the nodes in the network= have equal high clock accuracy, then let's consider (L3) router's rank, ba= sed on the default OF (as Raghuram suggest), as the only factor for selecti= ng timing parent. I would go that route, but maybe you have some counter example in mind? Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Monday, August 19, 2013 4:28 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, all, My 2c is the following. We already agreed on the fact that a mote's (RPL) r= outing parent would also be its (TSCH) time source neighbor. So why not pic= k the time source neighbor based on routing information? What exactly do you mean by clock accuracy? All nodes in a TSCH network nee= d to be able to synchronize with one another, and I don't think we are cons= idering cases where that is not true. Thomas On Thu, Aug 15, 2013 at 3:07 PM, > wrote: Raghuram, I agree with you that we need a method to pick a timing parent. We might need the L3 information on that, unless we can find a solution in = 6top to use L2 information. For example about the clock accuracy capabiliti= es of the device who has already joined the network. I am not sure if this = information is available in L2 and neighbor table. Best Wishes, Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Wednesday, August 14, 2013 12:57 AM To: xvilajosana@eecs.berkeley.edu; Za= nd, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang Subject: Re: [6tsch] RPL on Basic Xavi, Pouria, I think we need to keep node rank at 6top (as a read only parameter obtaine= d from L3) in order for the TSCH nodes to figure out the timing parent. In = the case where RPL node may have different ranks based on different OFs we = need a method to pick a timing parent. We should propose a default OF, that is used to compute the ranks for the p= urpose finding the timing parent. -raghuram From: Xavier Vilajosana Guillen > Reply-To: > Date: Tuesday, August 13, 2013 2:27 PM To: Pouria Zand > Cc: Thomas Watteyne >, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang = > Subject: Re: [6tsch] RPL on Basic Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, > wrote: Xavi, I guess we cannot keep "node rank" in the 6top. Because a node might have d= ifferent rank based on different metrics defined in L3. As a response, I do= n't think we can get all of those information form L3 and use them in neigh= bor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76D5DEXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Thomas,

    Yes, I mean neighbor disc= overy.

    “By listening longe= r at the beginning of the join process”, Do you mean during the scann= ing procedure?  During scanning procedure, the node continuously keeps listening in each channel. Let’s say 4 sec on each channel. My point= is, how long it should keep listening (more than 4 sec?) in each channel t= o be sure that after scanning 16 channels (16 * 4 seconds), most of the nei= ghbor are discovered. If we assume that the advertisement period is 2 seconds, by considering the channel hopping = of the advertisers, what is the probability of discovering most of the neig= hbors during join process?

    Am I missing anything?

    Best Wishes,

    Pouria

     <= /p>

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Thursday, August 29, 2013 8:34 PM
    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

     

    I see your points, which deal with neighbor discover= y, right? IMO, there is no problem to have both 6top and RPL add neighbors = to the neighbor table. In fact, one can consider the neighbor table to be s= ome data source managed jointly by L2 and L3. Some "columns" can be L2-specific (e.g. packet counte= rs), some L3-specific (e.g. rank).

     

    To discover more neighbor, do you see an advantage o= f listening after having synchronized, rather than listening longer at the = beginning of the join process?

     

    Thomas

     

    On Wed, Aug 28, 2013 at 11:53 AM, <P.Zand@utwente.nl> wrote:

    Thomas,

    The changes are:

    1.       Considering more time for 6top and MAC to= discover more potential neighbor and update their statistic in neighbor table, before starting RPL.

    2.       The RPL might consider the neighbor stati= stics in 6top as well as parent rank to select the parent. So, RPL will ask= 6top about the local statistics in the neighbor table by calling “read statistic request”.

    3.        Changing the time source informatio= n in 6top and MAC, upon selecting the new parent.

    I think you mean the first change. I am= right?

    I can remove that part.

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 28, 2013 8:25 PM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

     

    Wonderful diagram, great material to discuss over!

     

    I don't quite understand the changes you made in the second revisi= on. In my mind, the first revision was better:

    - node A initiates a network join procedure

    - it receives some EBs

    - after some settable time, it uses some settable algorithm to pic= k a time source neighbor

    - it keeps synchronized to that neighbor until told otherwise. No = routing information yet.

    - either it sends in a DIS, or waits, but in any case it receives = DIOs from its neighbors

    - RPL works exactly as-is, and pick routing parent(s).<= /p>

    - TSCH snoops on RPL's decision and changes time source neighbors = accordingly.

     

    Does that sum it up?

     

    Thomas

     

    On Wed, Aug 28, 2013 at 11:14 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    It absolutely makes sense.<= /o:p>

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Wednesday, August 28, 2013 7:21 PM

     

    Hi Pouria,

     

    I proposed adding "Change time source" along with "= Choosing the RPL parent" because we agreed before that the RPL parent = will be used as the time source. And, this time Xavi proposed to use the node with lowest EB' join priority as time source is just becau= se the RPL parent hasn't been found at the beginning. 

     

    Make sense?

     

    Qin

     

     

     

     

    On Thu, Aug 29, 2013 at 12:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    I changed the diagram based on your com= ment.

    However, I couldn’t conclude form= the discussion on “time parent selection based on EB priority” thread to find out, if L3 will make the final decision about the time sour= ce or L2.

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Wednesday, August 28, 2013 5:31 PM
    To: Zand, P. (EWI)
    Cc: Thomas Watteyne;     6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

     

    It is great to have the diagram as common base to discuss. I would= like to add "Changing time source" along with "Choosing the= RPL parent", because the time source selected at the beginning is just a temporary one, and time source in L2 should be same as= the RPL parent in L3 after RPL parent is selected.

     

    make sense?

     

    Qin

     

     

    On Wed, Aug 28, 2013 at 7:55 PM, <P.Zand@utwente.nl> wrote:

    Dear All,

    I would like to continue our discussion= for choosing the time source (either in L2 or L3) in the basic RPL.

    I prepared a sample of message sequence= chart to show the potential procedure for basic RPL.

    I think we can refer to or modify the a= ttached slide to discuss the details for constructing the basic RPL, as well as choosing the time source.

    Best Wishes,

    Pouria  

     

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 21, 2013 7:45 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Glad to read we agree!

    Thomas

     

    On Tue, Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    Many thanks for your explanation.

    I couldn’t find the related count= er in MAC PIB of IEEE 802.15.4.

     

    My first idea was using both (a) clock = accuracy information and (b) RPL rank information for choosing the best timing parent between two routers with equal (or close) RPL rank.= That would help us to avoid (1) synchronization loop problem and (2) poten= tial drifting problem caused by choosing the parent, between two with equal= ranks but not equal clock accuracy.

     

    As you mentioned, let’s not make = it complicated and consider the parent rank as a factor for choosing the timing parent.

     

    Pouria.

          &nb= sp;

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Thanks for the explanation. Allow me to answer inline.<= /p>

    Thomas

     

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    I am not expert in synchronization, so = please bear with me.

     

    By clock accuracy information, I mean h= ow accurate a node can maintain (e.g. =B11 ms) synchronization in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device’ environment conditions (e.g. temperature or shocks) and it doesn’t just depend o= n crystals hardware. Am I right?

     

    Agreed. I am used to the term "clock drift" for the phen= omenon, but absolutely, drift depends on manufacturing, voltage, temperatur= e, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronizat= ion needs to happen, given a guard time (i.e. 1ms). Of course, all these pa= rameters depend on each other, so you can imagine buying a better clock sou= rce, or changing the re-synchronization frequency, or changing the guard time.

     

     In the centralized approach, the = System/Network managers, use (L2) device clock accuracy information as well as (L3) nodes’ topology information (similar to node’s= rank in RPL in 6tsch distributed approach) to select the potential clock s= ources in the network. Am I right? 

     

    Hmm. I understand what you are proposing, but my first reaction is= to be a bit afraid that basing time source neighbor selection on clock dri= ft information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my = neighbor, could I not resolve that locally (through all kind of techniques = we can think of), rather than involving the time source neighbor selection = process in that?

     

     In a distributed approach, a netw= ork device might inform their neighbors about its (L2) clock accuracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL’ rank), to choose its timing parent.

     

    This would certainly invert the approach. Now, we let RPL select r= outing parents, and then we have TSCH just use the same. If we go the other= way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the f= irst of which are synchronization loops.

     

     If in 6tsch, we are considering t= he case that all the nodes in the network have equal high clock accuracy, then let’s consider (L3) router’s rank, based on the= default OF (as Raghuram suggest), as the only factor for selecting = timing parent.

     

    I would go that route, but maybe you have some counter example in = mind?

     

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

     

    Pouria, all,

     

    My 2c is the following. We already agreed on the fact that a mote'= s (RPL) routing parent would also be its (TSCH) time source neighbor. So wh= y not pick the time source neighbor based on routing information?

     

    What exactly do you mean by clock accuracy? All nodes in a TSCH ne= twork need to be able to synchronize with one another, and I don't think we= are considering cases where that is not true.

     

    Thomas

     

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:

    Raghuram,

    I agree with you that we need a method to pick a timi= ng parent.

    We might need the L3 information on that, unless we c= an find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

     

    From: Raghuram Sudhaakar (rs= udhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

     

    Xavi, Pouria,

    I think we need to keep node rank at 6top (as a read = only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

     

    We should propose a default OF, that is used to compu= te the ranks for the purpose finding the timing parent.

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

     

    Good point :-)

    agreed!
    X

     

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    I guess we cannot keep “node rank= ” in the 6top. Because a node might have different rank based on different metrics defined in L3. As a response, I don’t think we can= get all of those information form L3 and use them in neighbor table in 6to= p. Am I right?

    I think, as you mentioned we need to wo= rk on them.

     

    Pouria  

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Many thanks for your complete explanati= on. It absolutely makes sense.

     

    Just one minor question. The neighbor t= able will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?

    there are many different ways to implement that, this is an= option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about connect= ivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your description. Besides, there isn't a c= ommon shared cell to send KAs. I see the operation in the following way:

    6top KA timer expires and places a KA packet into the queue (e.g this ha= ppens every 30s). TSCH layer at the begining of a shared tx/rx slot then re= ads from the queue and sends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation us= ing Neighbors information described in Basic configuration.

        -this includes how = OF is calculated using numTx and numTxACK, etc..

     

    []

    -RPL configuration:<= /p>

         - storing mod= e vs non-storing mode (I vote for non-storing mode for a basic configuratio= n)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


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for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 12:53:18 -0700 (PDT) Received: from mail-pa0-x233.google.com (mail-pa0-x233.google.com [IPv6:2607:f8b0:400e:c03::233]) by ietfa.amsl.com (Postfix) with ESMTP id B75A411E8168 for <6tsch@ietf.org>; Thu, 29 Aug 2013 12:53:18 -0700 (PDT) Received: by mail-pa0-f51.google.com with SMTP id lf1so1352502pab.24 for <6tsch@ietf.org>; Thu, 29 Aug 2013 12:53:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=E24Z7n0QPMv5UarqrO44hAOs91531aQHoRFQM6qsZrs=; b=f6ebN60WH1E0fNmi+DezQhiA9B5MesMQPbaBq+ZK3IVdNCuRQMEyA56Ay0BCxsN36g bfnYuVIVDc38seXJdXX09rMkEDw+Jofyr2lQ/h4eh9YG1V83bfxTI3XulgrjKOh9Y5rk cQgGX/zwL51Ku3aIz0sx11WOmjuZ5wH6xG3Cy4US0paKc+iaE1mGo14OnQuxkA18cXlz 7Uj9O/zudIe0dz+Iep4QlxaMxMsijRbDb7XSQ2c5M0wfP/uyFBtfn8fZtilpWw7fNxhz c5EncAHAlAJZL+XDY4T3hywrDtKURDD6ZpdrAN/p4ftlLz3ZxZM4y76gt5OI5HtZbjfP qIUw== X-Received: by 10.66.248.161 with SMTP id yn1mr6561281pac.0.1377805997472; Thu, 29 Aug 2013 12:53:17 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Thu, 29 Aug 2013 12:52:57 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Thu, 29 Aug 2013 12:52:57 -0700 X-Google-Sender-Auth: pAQdnapt3Tnvo4rLzGAe_7CivpM Message-ID: To: Qin Wang Content-Type: multipart/alternative; boundary=047d7b15b0430c83f804e51b75b2 Cc: Maria Rita PALATTELLA , "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" , "JP Vasseur \(jvasseur\)" Subject: Re: [6tsch] Dynamic slot activation (was part of the 4th control flow) X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 19:53:19 -0000 --047d7b15b0430c83f804e51b75b2 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Of course! On Thu, Aug 29, 2013 at 12:11 PM, Qin Wang wrote: > Can we just call it "minimal 6TiSCH", instead of "minimal 6TiSCH > configuration"? > > Qin > > > On Fri, Aug 30, 2013 at 2:41 AM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote: > >> +1 >> >> Rather than "basic", let's talk about "minimal 6TiSCH Configuration", >> i.e. the title of the draft. >> >> Xavi agreed a couple of calls ago to rename >> "draft-vilajosana-6tsch-basic" to "draft-vilajosana-6tisch-minimal" >> >> Thomas >> >> >> On Thu, Aug 29, 2013 at 2:16 AM, Pascal Thubert (pthubert) < >> pthubert@cisco.com> wrote: >> >>> Hello Xavi and Qin:**** >>> >>> ** ** >>> >>> I=92m not sure we want to continue this discussion now or keep it for >>> later, but either way I=92m making it a separate thread to save the cur= rent >>> conclusions.**** >>> >>> ** ** >>> >>> In short, Thomas below asked:**** >>> >>> ** ** >>> >>> *Thomas> over what cells with the reports travel? Another questions >>> could be: over what cells will the request to install cells travel?* >>> >>> ** ** >>> >>> This is a good question and at the same time this is not really >>> something that we have to answer right now, per our proposed charter, a= s >>> Xavi indicates:**** >>> >>> *Xavi> I think it is better first to concentrate on the basic things* >>> >>> ** ** >>> >>> On the side I think the use of the word =91basic=92 these days could cr= eate >>> confusion since it seems to refer to draft-vilajosana-6tsch-basic which= is >>> probably not Xavi=92s intention here.**** >>> >>> I=92d suggest that when we refer to the operation in the >>> draft-vilajosana-6tsch-basic draft, we call it something like =93Basic >>> 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word = =93basic=94 may >>> not be confusing anymore.**** >>> >>> ** ** >>> >>> For this particular thread, I suggested as an answer to Thomas that 1) = I >>> agree that in the future the control flows could travel over a Basic 6T= iSCH >>> instance, and in that case 2) that we could probably handle burstiness = of >>> control traffic by overprovisioning time slots and then indicating >>> dynamically which extra time slots are being used; as Qin puts it very >>> clearly:**** >>> >>> *Qin> Over-provision can increase the throughput at peak time, while >>> the control bits can reduce the energy consumption for idle-listening (= at >>> least at the beginning of slot) in those unused Tx/Rx cells.* >>> >>> I was thinking of something like a =91more=92 bit in a cell the is bein= g >>> used in order to tell listeners to wake up in the next overprovisionned >>> cell, as opposed to a bit sent at the beginning of the overprovisionned >>> cell that would indicate that the cell is not being used, though. Xavi >>> agrees that it *Xavi> sounds to me a great idea***** >>> >>> ** ** >>> >>> To make sure that we do not make a confusion between 1) the bits that >>> control the use of overprovisionned cells in a bundle and that are pigy >>> backed with the traffic to indicate there is more trafficoutstanding an= d 2) >>> the end to end protocol that controls the allocation of cells between a >>> controlling entity and the device, or between devices, JP insisted that= the >>> control flows for the latter (which are the subject of the original thr= ead >>> by Qin) should be cleanly defined and that we should not expect to pigg= y >>> back them with traffic:**** >>> >>> *JP> I would just be vary cautious when thinking of piggybacking >>> control information in packet header for control plane purpose*** >>> >>> ** ** >>> >>> With this summary, it is up to us to continue the discussion or save it >>> for later. Should we continue, I suggest we do it in the context of Bas= ic >>> 6TiSCH to see if that mode could benefit from over-provisioned time slo= ts >>> but then provide a way to use only a subset of those slots. This would >>> probably make Basic 6TiSCH a lot more useful in the future for applicat= ions >>> of various scales and degrees of burstiness.**** >>> >>> ** ** >>> >>> Cheers,**** >>> >>> ** ** >>> >>> Pascal**** >>> >> >> > --047d7b15b0430c83f804e51b75b2 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Of course!


    On Thu, Aug 29, 2013 at 12:11 PM, Qin Wang <qinwang= @berkeley.edu> wrote:
    Can we just call it "m= inimal 6TiSCH", instead of "minimal 6TiSCH configuration"?= =A0

    Qin=A0


    O= n Fri, Aug 30, 2013 at 2:41 AM, Thomas Watteyne <watteyne@eecs.be= rkeley.edu> wrote:
    +1

    Rathe= r than "basic", let's talk about "minimal 6TiSCH Configu= ration", i.e. the title of the draft.

    Xavi agreed a couple of calls ago to rename "draft= -vilajosana-6tsch-basic" to "draft-vilajosana-6tisch-minimal"= ;

    Thomas


    On Thu, Aug 29, 2013 at 2:= 16 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote= :

    Hello Xavi and Qin:

    =A0<= /p>

    I=92m not sure we want=A0= to continue this discussion now or keep it for later, but either way I=92m= making it a separate thread to save the current conclusions.=

    =A0<= /p>

    In short, Thomas below as= ked:

    =A0<= /p>

    Thomas> over what c= ells with the reports travel? Another questions could be: over what cells w= ill the request to install cells travel?

    =A0<= /p>

    This is a good question a= nd at the same time this is not really something that we have to answer rig= ht now, per our proposed charter, as Xavi indicates:

    Xavi> I think it is= better first to concentrate on the basic things

    =A0<= /p>

    On the side I think the u= se of the word =91basic=92 these days could create confusion since it seems= to refer to draft-vilajosana-6tsch-basic which is probably not Xavi=92s intention here.

    I=92d suggest that when w= e refer to the operation in the draft-vilajosana-6tsch-basic draft, we call= it something like =93Basic 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word =93basic=94 may not be confusing anymore.<= /u>

    =A0<= /p>

    For this particular threa= d, I suggested as an answer to Thomas that 1) I agree that in the future th= e control flows could travel over a Basic 6TiSCH instance, and in that case 2) that we could probably handle burstiness of control tr= affic by overprovisioning time slots and then indicating dynamically which = extra time slots are being used; as Qin puts it very clearly:=

    Qin> Over-provision= can increase the throughput at peak time, while the control bits can reduc= e the energy consumption for idle-listening (at least at the beginning of slot) in those unused Tx/Rx cells.

    I was thinking of somethi= ng like a =91more=92 bit in a cell the is being used in order to tell liste= ners to wake up in the next overprovisionned cell, as opposed to a bit sent at the beginning of the overprovisionned cell that would ind= icate that the cell is not being used, though. Xavi agrees that it Xavi> sounds to me a great idea

    =A0<= /p>

    To make sure that we do n= ot make a confusion between 1) the bits that control the use of overprovisi= onned cells in a bundle and that are pigy backed with the traffic to indicate there is more trafficoutstanding and 2) the end to end= protocol that controls the allocation of cells between a controlling entit= y and the device, or between devices, JP insisted that the control flows fo= r the latter (which are the subject of the original thread by Qin) should be cleanly defined and that we shoul= d not expect to piggy back them with traffic:

    JP> I would just be= vary cautious when thinking of piggybacking control information in packet = header for control plane purpose

    =A0=

    With this summary, it is = up to us to continue the discussion or save it for later. Should we continu= e, I suggest we do it in the context of Basic 6TiSCH to see if that mode could be= nefit from over-provisioned time slots but then provide a way to use only a= subset of those slots. This would probably make Basic 6TiSCH a lot more useful in the future for applications of various scales = and degrees of burstiness.<= /span>

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal




    --047d7b15b0430c83f804e51b75b2-- From twatteyne@gmail.com Thu Aug 29 12:57:43 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D5C8E11E816B for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 12:57:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.883 X-Spam-Level: X-Spam-Status: No, score=-1.883 tagged_above=-999 required=5 tests=[AWL=0.094, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yPnzn6tKXFIq for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 12:57:43 -0700 (PDT) Received: from mail-pb0-x22f.google.com (mail-pb0-x22f.google.com [IPv6:2607:f8b0:400e:c01::22f]) by ietfa.amsl.com (Postfix) with ESMTP id E61B111E8163 for <6tsch@ietf.org>; Thu, 29 Aug 2013 12:57:42 -0700 (PDT) Received: by mail-pb0-f47.google.com with SMTP id rr4so895566pbb.6 for <6tsch@ietf.org>; Thu, 29 Aug 2013 12:57:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=cJhjjaiFnyz09LB1GrXnbxdhc9G9487OTvTBrXepWv4=; b=ELd/grYA0hVDGPGsoQTqdMfRw1J6U2EarXzYzvmegufwR/MQcjjcmwCywUJg7XhWCs +xmr1mLDiIxNl33nKGDpfTlbLHZ4o7J5/gmuEzxvCdseikXab0f2janG5XaESGHhusW3 /HPybEa58sFKzmQgLPBomO7+vxX1ZTOuhJVLc3IkjZS3zouSkqxnSXvtwilfMmb23tvf x066KgcovU+oOL8o8SGUGcqJGDuWWSMjriQnypGoO4/qzUCfvUZ1+/8ZmwOmcsqelcFL m/hiQ5FYrK9ZuCt3RizrPhBZkvWfyTPebCXdkpZP9nNqi6LsbjCkygqorLUIGvGxKFhf 9CRg== X-Received: by 10.68.98.101 with SMTP id eh5mr5622168pbb.65.1377806262551; Thu, 29 Aug 2013 12:57:42 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Thu, 29 Aug 2013 12:57:21 -0700 (PDT) From: Thomas Watteyne Date: Thu, 29 Aug 2013 12:57:21 -0700 X-Google-Sender-Auth: diO7mQIc-Cj77n5WaEIE4CoTqZA Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b6dd100d9524104e51b84f2 Subject: [6tsch] Agenda for the call on August 30 X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 19:57:44 -0000 --047d7b6dd100d9524104e51b84f2 Content-Type: text/plain; charset=ISO-8859-1 All, Below is the proposed agenda for the 6TSCH call tomorrow: - Approval minutes & agenda bashing [4min] - charter submitted - Vancouver: Hyatt hotel registration link - IETF MLs downtime 3pm-12am 08/28 - logo update - Flow identification [20min] - 4 flows? - how to trigger schedule update? - confirmation? - Network bootstrap [20min] - Synchronization and neighbor discovery [Pouria] - Time parent selection and EB priority [Xavi] - Impact of routing loops on synchronization? [Pascal] - Fast join [Alfredo, 10min] - AOB [1min] As usual, feel free to propose any changes to the agenda, also at the beginning of the call. Remember that this call will be recorded. Pascal & Thomas ---- Topic: 6TSCH Weekly Time: 8:00 am, Pacific Daylight Time (San Francisco, GMT-07:00) Meeting Number: 206 802 913 Meeting Password: sixtus ------------------------------------------------------- To start the online meeting ------------------------------------------------------- 1. Go to https://ciscosales.webex.com/ciscosales/j.php?ED=219615007&UID=481905242&PW=NZTRkNDAwOTE1&RT=MiMyMw%3D%3D 2. Log in to your account. 3. Click "Start Now". 4. Follow the instructions that appear on your screen. ---------------------------------------------------------------- ALERT:Toll-Free Dial Restrictions for (408) and (919) Area Codes ---------------------------------------------------------------- The affected toll free numbers are: (866) 432-9903 for the San Jose/Milpitas area and (866) 349-3520 for the RTP area. Please dial the local access number for your area from the list below: - San Jose/Milpitas (408) area: 525-6800 - RTP (919) area: 392-3330 ------------------------------------------------------- To join the teleconference only ------------------------------------------------------- 1. Dial into Cisco WebEx (view all Global Access Numbers at http://cisco.com/en/US/about/doing_business/conferencing/index.html 2. Follow the prompts to enter the Meeting Number (listed above) or Access Code followed by the # sign. San Jose, CA: +1.408.525.6800 RTP: +1.919.392.3330 US/Canada: +1.866.432.9903 United Kingdom: +44.20.8824.0117 India: +91.80.4350.1111 Germany: +49.619.6773.9002 Japan: +81.3.5763.9394 China: +86.10.8515.5666 To check whether you have the appropriate players installed for UCF (Universal Communications Format) rich media files, go to https://ciscosales.webex.com/ciscosales/systemdiagnosis.php http://www.webex.com CCM:+14085256800x206802913 --047d7b6dd100d9524104e51b84f2 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    Below is the proposed a= genda for the 6TSCH call tomorrow:

    • Ap= proval minutes & agenda bashing [4min]
      • charter submitte= d
      • Vancouver: Hyatt hotel registration link
      • IETF MLs downtime 3pm-= 12am 08/28
      • logo update
    • Flow identification [20min]
      =
      • 4 flows?
      • how to trigger schedule update?
      • confirmation?
    • Network bootstrap [20min]
      • Synchronization and neig= hbor discovery [Pouria]
      • Time parent selection and EB priority [Xavi= ]
      • Impact of routing loops on synchronization? [Pascal]
    • Fast join [Alfredo, 10min]
    • AOB [1min]

    As usual, feel free to propose any changes to the a= genda, also at the beginning of the call.

    Remember= that this call will be recorded.

    Pascal & Thomas

    ----
    =

    Topic: 6TSCH Weekly
    Time: 8:00 am, Pacific Da= ylight Time (San Francisco, GMT-07:00)=A0
    Meeting Number: 206 802= 913=A0
    Meeting Password: sixtus=A0

    -----------------= --------------------------------------=A0
    To start the online mee= ting=A0
    -------------------------------------------------------= =A0
    2. Log in to your account.=A0
    3. Click "Start Now"= .=A0
    4. Follow the instructions that appear on your screen.=A0

    ----------------------------------------------------= ------------=A0
    ALERT:Toll-Free Dial Restrictions for (408) and (919) Area Codes=A0
    ----------------------------------------------------------------=A0=

    The affected toll free numbers are: (866) 432-9903 for the San Jose/M= ilpitas area and (866) 349-3520 for the RTP area.=A0

    Please dial the local access number for your area from = the list below:=A0
    - San Jose/Milpitas (408) area: 525-6800=A0
    - RTP (919) area: 392-3330=A0

    ------------= -------------------------------------------=A0
    To join the teleconference only=A0
    -------------------------= ------------------------------=A0
    1. Dial into Cisco WebEx (view = all Global Access Numbers at=A0
    2. Follow the prompts to enter the Meeting Number (listed above) or Ac= cess Code followed by the # sign.=A0

    San Jose, CA:= +1.408.525.6800 RTP: +1.= 919.392.3330=A0

    US/Canada: +1.86= 6.432.9903 United Kingdom: +44.20.8824.0117=A0


    CCM:+14085256800x206802913=
    --047d7b6dd100d9524104e51b84f2-- From xvilajosana@berkeley.edu Thu Aug 29 13:00:35 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6F87E21F9C88 for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 13:00:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.7 X-Spam-Level: X-Spam-Status: No, score=-2.7 tagged_above=-999 required=5 tests=[AWL=0.276, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MOMLV4BcHeOh for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 13:00:28 -0700 (PDT) Received: from mail-pa0-f44.google.com (mail-pa0-f44.google.com [209.85.220.44]) by ietfa.amsl.com (Postfix) with ESMTP id 29CF721F9BF3 for <6tsch@ietf.org>; Thu, 29 Aug 2013 13:00:27 -0700 (PDT) Received: by mail-pa0-f44.google.com with SMTP id fz6so1363295pac.31 for <6tsch@ietf.org>; Thu, 29 Aug 2013 13:00:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=P8kan+G2jHvBYIW8SzQ2fqzt/SEe8HjkGQCtfBp79i4=; b=BPLQlbbMYEcV+tUijJGup7GzsBv/0MC5rmCX4ZADouK1PwP2FKPsydsBXHjirTK9QO OZ/lH6RA62ER2k0Gl6lG06sXRFhxfQf+v8SIwyWS/Fb4SawE77QugiYbSM6zcst/ul4q BXxRQ/QeOf0q0vuaxKWjCj+OCPjv3+LN9Tmgg6YnYbD2pjHRQDckV0x+6ZXGc9IOakH8 /4UfJllOiGRwhjjV6NL8icXAIy+9iQk7C7sZ7VNKOC1+0c/K650v/6BD1GM9LghjENCJ /dpOFwOxNukr+vKuv851cLl034ferjDcbfzkKM6Nkcsv3y9EFhUP0S3+LIbgxnMjG8AC xr5w== X-Gm-Message-State: ALoCoQkv1v5Hg9q87zM9B3R8u1VNLhzdu8/7DdwHNPG5nuDre7wVec4u2Hynw3G3iBC9pa1RMLmw MIME-Version: 1.0 X-Received: by 10.68.194.161 with SMTP id hx1mr5475440pbc.164.1377806425910; Thu, 29 Aug 2013 13:00:25 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Thu, 29 Aug 2013 13:00:25 -0700 (PDT) In-Reply-To: References: Date: Thu, 29 Aug 2013 13:00:25 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7b10d1ef96001e04e51b8e4e Cc: Maria Rita PALATTELLA , "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang , "JP Vasseur \(jvasseur\)" Subject: Re: [6tsch] Dynamic slot activation (was part of the 4th control flow) X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 20:00:35 -0000 --047d7b10d1ef96001e04e51b8e4e Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable ok, I like it. If there is no objection I will change the name to minimal 6TiSCH cheers. Xavi On Thu, Aug 29, 2013 at 12:52 PM, Thomas Watteyne < watteyne@eecs.berkeley.edu> wrote: > Of course! > > > On Thu, Aug 29, 2013 at 12:11 PM, Qin Wang wrote: > >> Can we just call it "minimal 6TiSCH", instead of "minimal 6TiSCH >> configuration"? >> >> Qin >> >> >> On Fri, Aug 30, 2013 at 2:41 AM, Thomas Watteyne < >> watteyne@eecs.berkeley.edu> wrote: >> >>> +1 >>> >>> Rather than "basic", let's talk about "minimal 6TiSCH Configuration", >>> i.e. the title of the draft. >>> >>> Xavi agreed a couple of calls ago to rename >>> "draft-vilajosana-6tsch-basic" to "draft-vilajosana-6tisch-minimal" >>> >>> Thomas >>> >>> >>> On Thu, Aug 29, 2013 at 2:16 AM, Pascal Thubert (pthubert) < >>> pthubert@cisco.com> wrote: >>> >>>> Hello Xavi and Qin:**** >>>> >>>> ** ** >>>> >>>> I=92m not sure we want to continue this discussion now or keep it for >>>> later, but either way I=92m making it a separate thread to save the cu= rrent >>>> conclusions.**** >>>> >>>> ** ** >>>> >>>> In short, Thomas below asked:**** >>>> >>>> ** ** >>>> >>>> *Thomas> over what cells with the reports travel? Another questions >>>> could be: over what cells will the request to install cells travel?* >>>> >>>> ** ** >>>> >>>> This is a good question and at the same time this is not really >>>> something that we have to answer right now, per our proposed charter, = as >>>> Xavi indicates:**** >>>> >>>> *Xavi> I think it is better first to concentrate on the basic things* >>>> >>>> ** ** >>>> >>>> On the side I think the use of the word =91basic=92 these days could c= reate >>>> confusion since it seems to refer to draft-vilajosana-6tsch-basic whic= h is >>>> probably not Xavi=92s intention here.**** >>>> >>>> I=92d suggest that when we refer to the operation in the >>>> draft-vilajosana-6tsch-basic draft, we call it something like =93Basic >>>> 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word = =93basic=94 may >>>> not be confusing anymore.**** >>>> >>>> ** ** >>>> >>>> For this particular thread, I suggested as an answer to Thomas that 1) >>>> I agree that in the future the control flows could travel over a Basic >>>> 6TiSCH instance, and in that case 2) that we could probably handle >>>> burstiness of control traffic by overprovisioning time slots and then >>>> indicating dynamically which extra time slots are being used; as Qin p= uts >>>> it very clearly:**** >>>> >>>> *Qin> Over-provision can increase the throughput at peak time, while >>>> the control bits can reduce the energy consumption for idle-listening = (at >>>> least at the beginning of slot) in those unused Tx/Rx cells.* >>>> >>>> I was thinking of something like a =91more=92 bit in a cell the is bei= ng >>>> used in order to tell listeners to wake up in the next overprovisionne= d >>>> cell, as opposed to a bit sent at the beginning of the overprovisionne= d >>>> cell that would indicate that the cell is not being used, though. Xavi >>>> agrees that it *Xavi> sounds to me a great idea***** >>>> >>>> ** ** >>>> >>>> To make sure that we do not make a confusion between 1) the bits that >>>> control the use of overprovisionned cells in a bundle and that are pig= y >>>> backed with the traffic to indicate there is more trafficoutstanding a= nd 2) >>>> the end to end protocol that controls the allocation of cells between = a >>>> controlling entity and the device, or between devices, JP insisted tha= t the >>>> control flows for the latter (which are the subject of the original th= read >>>> by Qin) should be cleanly defined and that we should not expect to pig= gy >>>> back them with traffic:**** >>>> >>>> *JP> I would just be vary cautious when thinking of piggybacking >>>> control information in packet header for control plane purpose*** >>>> >>>> ** ** >>>> >>>> With this summary, it is up to us to continue the discussion or save i= t >>>> for later. Should we continue, I suggest we do it in the context of Ba= sic >>>> 6TiSCH to see if that mode could benefit from over-provisioned time sl= ots >>>> but then provide a way to use only a subset of those slots. This would >>>> probably make Basic 6TiSCH a lot more useful in the future for applica= tions >>>> of various scales and degrees of burstiness.**** >>>> >>>> ** ** >>>> >>>> Cheers,**** >>>> >>>> ** ** >>>> >>>> Pascal**** >>>> >>> >>> >> > --047d7b10d1ef96001e04e51b8e4e Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    ok, I like it. If there is no objection I will change= the name to minimal 6TiSCH

    cheers.
    Xavi

    =


    On Thu,= Aug 29, 2013 at 12:52 PM, Thomas Watteyne <watteyne@eecs.berkele= y.edu> wrote:
    Of course!


    On Thu, Aug 29, 2013 at 12:11 PM, Qin Wang <qinwang@berkeley.edu>= ; wrote:
    Can we just call it "m= inimal 6TiSCH", instead of "minimal 6TiSCH configuration"?= =A0

    Qin=A0


    On Fri, Aug 30, 2013 at 2:41 AM= , Thomas Watteyne <watteyne@eecs.berkeley.edu> wrot= e:
    +1

    Rathe= r than "basic", let's talk about "minimal 6TiSCH Configu= ration", i.e. the title of the draft.

    Xavi agreed a couple of calls ago to rename "draft= -vilajosana-6tsch-basic" to "draft-vilajosana-6tisch-minimal"= ;

    Thomas


    On Thu, Aug 29, 2013 at 2:= 16 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote= :

    Hell= o Xavi and Qin:

    =A0<= /p>

    I=92m not sure we want=A0= to continue this discussion now or keep it for later, but either way I=92m= making it a separate thread to save the current conclusions.=

    =A0<= /p>

    In short, Thomas below as= ked:

    =A0<= /p>

    Thomas> over what c= ells with the reports travel? Another questions could be: over what cells w= ill the request to install cells travel?

    =A0<= /p>

    This is a good question a= nd at the same time this is not really something that we have to answer rig= ht now, per our proposed charter, as Xavi indicates:

    Xavi> I think it is= better first to concentrate on the basic things

    =A0<= /p>

    On the side I think the u= se of the word =91basic=92 these days could create confusion since it seems= to refer to draft-vilajosana-6tsch-basic which is probably not Xavi=92s intention here.

    I=92d suggest that when w= e refer to the operation in the draft-vilajosana-6tsch-basic draft, we call= it something like =93Basic 6TiSCH=94 or =93Basic 6TiSCH Support=94 so the use of the plain word =93basic=94 may not be confusing anymore.<= /u>

    =A0<= /p>

    For this particular threa= d, I suggested as an answer to Thomas that 1) I agree that in the future th= e control flows could travel over a Basic 6TiSCH instance, and in that case 2) that we could probably handle burstiness of control tr= affic by overprovisioning time slots and then indicating dynamically which = extra time slots are being used; as Qin puts it very clearly:=

    Qin> Over-provision= can increase the throughput at peak time, while the control bits can reduc= e the energy consumption for idle-listening (at least at the beginning of slot) in those unused Tx/Rx cells.

    I was thinking of somethi= ng like a =91more=92 bit in a cell the is being used in order to tell liste= ners to wake up in the next overprovisionned cell, as opposed to a bit sent at the beginning of the overprovisionned cell that would ind= icate that the cell is not being used, though. Xavi agrees that it Xavi> sounds to me a great idea

    =A0<= /p>

    To make sure that we do n= ot make a confusion between 1) the bits that control the use of overprovisi= onned cells in a bundle and that are pigy backed with the traffic to indicate there is more trafficoutstanding and 2) the end to end= protocol that controls the allocation of cells between a controlling entit= y and the device, or between devices, JP insisted that the control flows fo= r the latter (which are the subject of the original thread by Qin) should be cleanly defined and that we shoul= d not expect to piggy back them with traffic:

    JP> I would just be= vary cautious when thinking of piggybacking control information in packet = header for control plane purpose

    =A0=

    With this summary, it is = up to us to continue the discussion or save it for later. Should we continu= e, I suggest we do it in the context of Basic 6TiSCH to see if that mode could be= nefit from over-provisioned time slots but then provide a way to use only a= subset of those slots. This would probably make Basic 6TiSCH a lot more useful in the future for applications of various scales = and degrees of burstiness.<= /span>

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal





    --047d7b10d1ef96001e04e51b8e4e-- From maria-rita.palattella@uni.lu Thu Aug 29 23:39:13 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 39EC721E805A for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 23:39:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.538 X-Spam-Level: X-Spam-Status: No, score=-6.538 tagged_above=-999 required=5 tests=[AWL=0.060, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lmmOgi1brqly for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 23:39:08 -0700 (PDT) Received: from hercules.uni.lu (hercules.uni.lu [158.64.76.33]) by ietfa.amsl.com (Postfix) with ESMTP id 518F821F9C52 for <6tsch@ietf.org>; Thu, 29 Aug 2013 23:39:04 -0700 (PDT) X-IronPort-AV: E=Sophos;i="4.89,989,1367964000"; d="scan'208,217";a="26173654" Received: from unknown (HELO REED.uni.lux) ([10.21.2.9]) by hercules.uni.lu with ESMTP; 30 Aug 2013 08:38:59 +0200 Received: from HOSHI.uni.lux ([fe80::499:a33:4e68:4af9]) by REED.uni.lux ([fe80::31bb:b7a3:7abb:813e%10]) with mapi id 14.03.0158.001; Fri, 30 Aug 2013 08:38:58 +0200 From: Maria Rita PALATTELLA To: "Pascal Thubert (pthubert)" , Qin Wang Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOo2nA37SuPY1UNUSxyNbir/bk6pmpcIqAgAATvoCAARHRgIAANpuAgAAq9oCAABtKgIAA0eWggAA+SACAAAnBgIABIv9w Date: Fri, 30 Aug 2013 06:38:58 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.91.0.71] Content-Type: multipart/alternative; boundary="_000_F085911F642A6847987ADA23E611780D18593CB0hoshiunilux_" MIME-Version: 1.0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Aug 2013 06:39:13 -0000 --_000_F085911F642A6847987ADA23E611780D18593CB0hoshiunilux_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks Qin and Pascal for your clarification. Now I am synchronize with you! So, I will think again about specifications = for the report and control flow. Maria Rita From: Pascal Thubert (pthubert) [mailto:pthubert@cisco.com] Sent: Thursday, August 29, 2013 5:16 PM To: Qin Wang; Maria Rita PALATTELLA Cc: Thomas Watteyne; 6tsch@ietf.org; xvilajosana@eecs.berkeley.edu Subject: RE: [6tsch] the 4th control flow Hello Qin: I'm with you that the reports and events are initiated by the device. Then there is the flow that we discussed at the call last week and that tri= ggered this thread. The use case is a new control loop for which a sensor d= evice talks to the controller (the PCE) to request the establishment of a p= ath between self and an actuator. I imagined that this was considered an event. But maybe not? Pascal From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Qin Wang Sent: jeudi 29 ao=FBt 2013 16:41 To: Maria Rita PALATTELLA Cc: Thomas Watteyne; 6tsch@ietf.org; xvilajosana@eec= s.berkeley.edu Subject: Re: [6tsch] the 4th control flow Hi Maria Rita, Thank you very much for the updated version. Regarding to who triggers Report Flow and Event Flow, I have different unde= rstanding as follows. Being different from Query Flow, both Report Flow and= Event Flow are triggered by nodes themselves, instead of a query from ME. = In particular, the Report Flow will be triggered by a timer, because it cor= responds to periodically reporting behavior; and the Event Flow will be tri= ggered by some event specified by ME in advance, something like a alarm. What do you think? Qin On Thu, Aug 29, 2013 at 5:00 PM, Maria Rita PALATTELLA > wrote: All, going back to the definition of the 4 control flows, I tried to fill s= ome of the TODO rows of the tables that Qin created so far. An updated version of these tables is attached. I left also some comments f= or discussing on. Any comment is welcome. Maria Rita From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Xavier Vilajos= ana Guillen Sent: Thursday, August 29, 2013 12:27 AM To: Qin Wang Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] the 4th control flow Hi, I also agree with the 4 message flows. as regards to Confirmation, this would introduce end-to-end confirmation at= L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an opti= onal feature? X On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang > wrote: Thomas, I agree to the 4 control flows. One more question for the two node->ME flow= s: Is a Confirmation from ME to node needed? Thanks Qin On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne > wrote: All, If possible, let's keep things simple and stick closely to the charter, cer= tainly for now. I would like to propose the following assumptions: * let's assume signaling and data packets are independent. IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking. * let's consider the steps highlighted in the charter, for now: * draft-vilajosana-6tsch-basic gives us a network with minimal conne= ctivity between all nodes in the network. Most of the schedule is empty, av= ailable ot some dynamic scheduler. * the scheduler uses the minimal connectivity to communicate, either= between neighbors (distributed), or between nodes and the PCE (centralized= ) If we agree with this, I propose we go back to discussing the types of flow= s, per the name of this thread. I'd like to call on a rough consensus for t= he following 4 flows: * ME->node * action * query * node->ME * report * event Thomas On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang > wrote: Thomas, I agree to keep different alternatives, at lease as options. Regarding to what kinds of cells should be used for conveying the report, s= hared cells or dedicated cells, I would like to leave them to configuration= . What do you think? Thanks Qin On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne > wrote: Qin, You bring up a good point: over what cells with the reports travel? Another= questions could be: over what cells will the request to install cells trav= el? I believe that, whatever the policy in place in the network, there will= always need to be some cells installed for infrequent signaling traffic. I= f the report rate is very slow, it might qualify as "infrequent signaling t= raffic". For sure, the request to change the schedule qualifies. Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha s= chedule indicated in the draft can be used for the signaling traffic betwee= n the nodes and the ME. Of course, if the report rate is very high, some de= dicate track might be installed, but I do not believe this is needed, certa= inly not this early on. I agree with Diego that keeping the solution open to different alternative = is key. Thomas On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne > wrote: Qin, Thomas, Alternative (1) adds delay to define the slots to send the event to the ME (propagate the new schedule), while alternative (2) keeps reserved slots waiting for the event to happen= . I think both alternatives should be included, and configured by the ME depe= nding on the network requirements. More thoughts? Diego Dujovne 2013/8/27 Qin Wang >: > Thomas, > > I agree with almost all. Only some comments on "Report Flow". > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-drive= n > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven repo= rt > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured b= y > ME, just like the interval of periodically report. Make sense? > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see. > (1) when a event is triggered, node sends a request to ME and ask some BW= to > send the report. I believe that is how the 4th control flow works. > (2) when ME configure the events and their triggers, ME also provisions s= ome > BW for the node which allows the node to send the report triggered by som= e > event. > > I have no strong opinion on which one is better. But, the bottom line is = the > configuration of the set of events and their triggers should be out of 6t= op > scope. Thought? > > Thanks > Qin > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: >> >> Qin, >> >> Please correct me if I'm wrong: >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typical >> commands are add/delete cells. >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> queries are about current cells usage or statistics. >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported >> information covers cells usage or statistics. >> >> Questions: >> - Looks like Query and Report flows contain the same information. In >> normal operation, the Report flow should be enough, the Query flow only >> being used in special cases, for example when the ME has lost state (jus= t >> booted, bug, etc). Agreed? >> - The ME should be able to configure the report flow. Configuration coul= d >> be "send report every X seconds" or "send report when variable X larger = than >> Y". I imagine this could be done over the action flow? Agreed? >> - A node will want to report an urgent event to the ME. One such events = is >> "the topology appears to have changed". There any many cases where this >> information needs to be sent immediately, i.e. no time to wait for the n= ext >> report cycle. We can consider this to be an asynchronous report, or part= of >> a new "Event" flow. >> - Same for the mote asking the ME for a schedule update. >> >> Thoughts? >> >> Thomas >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: >>> >>> Xavi, >>> >>> Approach-(2) is more flexible and likely covers more situations. But, i= t >>> may bring some complexity to 6top, because 6top has to make decision on= the >>> bandwidth request (add/delete), which needs some metrics, some intellig= ence. >>> >>> What do you think? >>> >>> Qin >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> > w= rote: >>>> >>>> Hi Qin, I like your (2). >>>> >>>> Note also that there are situations that might have some differences. >>>> >>>> 1-the track already exists. >>>> 2-the track between the two entities does not exists >>>> >>>> in either case I think that the node that requires certain BW to anoth= er >>>> node should talk to 6top, which processes that request and sends a req= uest >>>> to the ME, the ME installs that new track. >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> X >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: >>>>> >>>>> Hi all, >>>>> >>>>> During today's call, we presented three control flows between >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Re= port >>>>> Flow, and started to talk about the 4th control flow. The thread will >>>>> continue the discussion about 4th flow. >>>>> >>>>> Here is the scenario: when a node finds that more cells are needed, >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be ab= le to >>>>> ask ME to install more bandwidth. >>>>> >>>>> I can see two approaches: >>>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRat= e >>>>> is a attribute in 6top. Then, ME can get the information via Query Fl= ow or >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>>> Request to ME, and then ME install more bandwidth. This is the 4th co= ntrol >>>>> flow. >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> >> -- >> Thomas Watteyne, Ph. D >> Sr. Networking Design Engineer >> Dust Networks / Linear Technology >> 30695 Huntwood Ave >> Hayward, CA 94544-7021 >> +1 (510) 400-2978 >> twatteyne@linear.com >> >> This e-mail transmission, and any documents, files or previous e-mail >> messages attached to it may contain confidential information that is leg= ally >> privileged. If you are not the intended recipient, or a person responsib= le >> for delivering it to the intended recipient, you are hereby notified tha= t >> any disclosure, copying, distribution or use of any of the information >> contained in or attached to this transmission is STRICTLY PROHIBITED. If= you >> have received this transmission in error, please immediately notify me b= y >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original >> transmission and its attachments without reading or saving in any manner= . >> Thank you. > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_F085911F642A6847987ADA23E611780D18593CB0hoshiunilux_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Thanks Qin and Pascal for= your clarification.

    Now I am synchronize with= you! So, I will think again about specifications for the report and contro= l flow.

    Maria Rita

     <= /p>

    From: Pascal T= hubert (pthubert) [mailto:pthubert@cisco.com]
    Sent: Thursday, August 29, 2013 5:16 PM
    To: Qin Wang; Maria Rita PALATTELLA
    Cc: Thomas Watteyne; 6tsch@ietf.org; xvilajosana@eecs.berkeley.edu Subject: RE: [6tsch] the 4th control flow

     

    Hello Qin:

     <= /p>

    I’m with you that t= he reports and events are initiated by the device.

     <= /p>

    Then there is the flow th= at we discussed at the call last week and that triggered this thread. The u= se case is a new control loop for which a sensor device talks to the controller (the PCE) to request the establishment of a path b= etween self and an actuator.

     <= /p>

    I imagined that this was = considered an event. But maybe not?

     <= /p>

    Pascal

     <= /p>

    From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: jeudi 29 ao=FBt 2013 16:41
    To: Maria Rita PALATTELLA
    Cc: Thomas Watteyne; 6tsch@ietf.or= g; xvilajosana@eecs.berkeley.edu
    Subject: Re: [6tsch] the 4th control flow

     

    Hi Maria Rita,

     

    Thank you very much for the updated version.

     

    Regarding to who triggers Report Flow and Event Flow= , I have different understanding as follows. Being different from Query Flo= w, both Report Flow and Event Flow are triggered by nodes themselves, inste= ad of a query from ME. In particular, the Report Flow will be triggered by a timer, because it corresponds to pe= riodically reporting behavior; and the Event Flow will be triggered by some= event specified by ME in advance, something like a alarm.

     

    What do you think?

     

    Qin

     

     

    On Thu, Aug 29, 2013 at 5:00 PM, Maria Rita PALATTEL= LA <ma= ria-rita.palattella@uni.lu> wrote:

    All, going back to the definition of th= e 4 control flows, I tried to fill some of the TODO rows of the tables that Qin created so far.

     

    An updated version of these tables is a= ttached. I left also some comments for discussing on.

    Any comment is welcome.

     

    Maria Rita

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: Thursday, August 29, 2013 12:27 AM
    To: Qin Wang
    Cc: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] the 4th control flow

     

    Hi, I also agree with the 4 message flows.


    as regards to Confirmation, this would introduce end-to-end confirmation at= L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an opti= onal feature?


    X

     

    On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

     

    I agree to the 4 control flows. One more question for the two node= ->ME flows: Is a Confirmation from ME to node needed?

     

    Thanks

    Qin

     

    On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    All,

     

    If possible, let's keep things simple and stick closely to the cha= rter, certainly for now.

     

    I would like to propose the following assumptions:

    • let's assume signaling and data packets are independent.
      IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking.
    • let's consider the steps highlighted in the charter, for now:
      • draft-vilajosana-6tsch-basic gives us a network with minimal connectivity b= etween all nodes in the network. Most of the schedule is empty, available o= t some dynamic scheduler.
      • the scheduler uses the minimal connectivity to communicate, either between = neighbors (distributed), or between nodes and the PCE (centralized)

    If we agree with this, I propose we go back to discussing the type= s of flows, per the name of this thread. I'd like to call on a rough consen= sus for the following 4 flows:

    • ME->node
      • action
      • query
    • node->ME
      • report
      • event

    Thomas

     

     

    On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

     

    I agree to keep different alternatives, at lease as options.<= /o:p>

     

    Regarding to what kinds of cells should be used for conveying the = report, shared cells or dedicated cells, I would like to leave them to conf= iguration. What do you think?

     

    Thanks

    Qin

     

     

    On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    Qin,

     

    You bring up a good point: over what cells with the reports travel= ? Another questions could be: over what cells will the request to install c= ells travel? I believe that, whatever the policy in place in the network, there will always need to be some cell= s installed for infrequent signaling traffic. If the report rate is very sl= ow, it might qualify as "infrequent signaling traffic". For sure,= the request to change the schedule qualifies.

     

    Isn't the answer draft-vilajosana-6tsch-basic? That is, the s= lotted Aloha schedule indicated in the draft can be used for the signaling = traffic between the nodes and the ME. Of course, if the report rate is very high, some dedicate track might be inst= alled, but I do not believe this is needed, certainly not this early on.

     

    I agree with Diego that keeping the solution open to different alt= ernative is key.

     

    Thomas

     

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne <diego.dujovne@mail.= udp.cl> wrote:

    Qin, Thomas,
          Alternative (1) adds delay to define the slots to send= the event
    to the ME (propagate the new schedule),
    while alternative (2)  keeps reserved slots waiting for the event to h= appen.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driven r= eport
    > is. I think we don't want to assume 6top sublayer is very intelligent,= in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is  when and how the bandw= idth for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control flows = between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> += ;1 (510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125=

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

    --_000_F085911F642A6847987ADA23E611780D18593CB0hoshiunilux_-- From pthubert@cisco.com Fri Aug 30 09:08:27 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D7F9021E808F for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 09:08:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.265 X-Spam-Level: X-Spam-Status: No, score=-10.265 tagged_above=-999 required=5 tests=[AWL=-0.266, BAYES_00=-2.599, J_CHICKENPOX_34=0.6, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KOUFawuZntZv for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 09:08:22 -0700 (PDT) Received: from rcdn-iport-3.cisco.com (rcdn-iport-3.cisco.com [173.37.86.74]) by ietfa.amsl.com (Postfix) with ESMTP id 50AD221E8087 for <6tsch@ietf.org>; Fri, 30 Aug 2013 09:08:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=560; q=dns/txt; s=iport; t=1377878902; x=1379088502; h=from:to:subject:date:message-id: content-transfer-encoding:mime-version; bh=+9USM6QbS5sb2cqA6mRQcM3wd4reL9nWGN4OiTCXiQs=; b=UR+1DRCxm/l+hqqRiqcBU/Y+zCvJo7JZpvRfopLiNNKUMVGPc3ry/6K2 xfbzzNtGRQulN86fd9ClrgAf+TcDO4M94ioPcEQkP3/gUFyl/qgOw3IM+ AVBQXSuI5f8cD2LqPp3nefz7NPLOxtBhWJIqaZxKgBGLW8FuvIZwKfvPU k=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AmUGAEXCIFKtJXG9/2dsb2JhbABagweBBr9AgQ+BHhZtB4ImAQQ6LSQBKhRCJgEEG4d5mFehNI9Dg1SBAAOpWYMggio X-IronPort-AV: E=Sophos;i="4.89,992,1367971200"; d="scan'208";a="253808924" Received: from rcdn-core2-2.cisco.com ([173.37.113.189]) by rcdn-iport-3.cisco.com with ESMTP; 30 Aug 2013 16:08:20 +0000 Received: from xhc-rcd-x06.cisco.com (xhc-rcd-x06.cisco.com [173.37.183.80]) by rcdn-core2-2.cisco.com (8.14.5/8.14.5) with ESMTP id r7UG8KQ9017144 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for <6tsch@ietf.org>; Fri, 30 Aug 2013 16:08:20 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-rcd-x06.cisco.com ([173.37.183.80]) with mapi id 14.02.0318.004; Fri, 30 Aug 2013 11:08:20 -0500 From: "Pascal Thubert (pthubert)" To: "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: About the special type of event to ask PCE to create a track Thread-Index: Ac6lmv6UDqCTdsa9SmO4Ef5o8dIVRA== Date: Fri, 30 Aug 2013 16:08:20 +0000 Deferred-Delivery: Fri, 30 Aug 2013 16:08:00 +0000 Message-ID: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.55.22.3] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: [6tsch] About the special type of event to ask PCE to create a track X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Aug 2013 16:08:28 -0000 Dear all, We discussed at the call that the(PCEP?) request to ask for a track establi= shment could be seen as an event, or could be a new flow. At the call, I suggested that it could be a new, 5th flow. My arguments are= that this flow: - Probably yields different data format. The demand carries and points, end= to end latency and bandwidth. That's quite specific. - Probably yields a different flow. Events do not necessarily have a respon= se.=20 - Probably uses a different transport as well (PCEP vs. CoAP) What do you think? Pascal From twatteyne@gmail.com Fri Aug 30 10:40:48 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 465B121F977A for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:40:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.886 X-Spam-Level: X-Spam-Status: No, score=-1.886 tagged_above=-999 required=5 tests=[AWL=0.091, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LHaBPIiIsNnw for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:40:45 -0700 (PDT) Received: from mail-pb0-x22c.google.com (mail-pb0-x22c.google.com [IPv6:2607:f8b0:400e:c01::22c]) by ietfa.amsl.com (Postfix) with ESMTP id C1A3F21F87D1 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:40:45 -0700 (PDT) Received: by mail-pb0-f44.google.com with SMTP id xa7so2151190pbc.3 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:40:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=NTTM+HX7mOyIJbfQk4HBdMTKL8yUohV5WDus4vHnVZo=; b=0tR8/QcpFRbujf2P76IICBoxV1xh6LPmZ35KHUZAy3514fhz1x55RqJTjqt8n5P8S5 97eERBCTuEpARqB4t3NS+Sehcij9bCUVltliyQ/7ycHwuh6VhFpZVT3H9b9YA4phlOcz ScmFc4t7Gk9oejcPBkr23PRXmM2k1szyS7yZJJxs0TOkxBpUrnGOiLy/5JVOHWECEawb 3PFINu0WB6vEPm6OjJxVpNwf0xzkvsnKGFfFAdBVE9HqctzTHy/ApEV+TQPMEHeOSDBC 0GtBEGYj9K7vWTwTBKBOmRGGX3IwCJuSNdDTQcz/WJ/yx2VLSCQNYUAj0eOou9WRGm4W ByMg== X-Received: by 10.66.219.41 with SMTP id pl9mr4834561pac.187.1377884445419; Fri, 30 Aug 2013 10:40:45 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 30 Aug 2013 10:40:25 -0700 (PDT) From: Thomas Watteyne Date: Fri, 30 Aug 2013 10:40:25 -0700 X-Google-Sender-Auth: wgcdh4UvYBhCYPbin_fyCzvRyik Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b5da81fe934ba04e52db85c Subject: [6tsch] minutes webex 30 August 2013 X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Aug 2013 17:40:48 -0000 --047d7b5da81fe934ba04e52db85c Content-Type: text/plain; charset=ISO-8859-1 All, You will find the minutes of today's webex below. FYI, all the minutes and slides are archived a https://bitbucket.org/6tsch/meetings/. Thanks to Xavi and Dominique for taking notes! As usual, fix anything we might have missed directly in the e-mail and reply. We will approve and adopt the minutes at the next call. Thomas --- Minutes Webex 30 August 2013, 6TiSCH group Note: timestamps in PDT. Taking notes *(using Etherpad)* 1. Xavi Vilajosana 2. Dominique Barthel 3. Thomas Watteyne Present *(alphabetically)* 1. Alfredo Grieco 2. Diego Dujovne 3. Dominique Barthel 4. Geraldine Texier 5. Laurent Toutain 6. Maria Rita Palattella 7. Oliver Hahm 8. Pascal Thubert 9. Patrick Wetterwald 10. Pieter de Mil 11. Pouria Zand 12. Qin Wang 13. Raghuram Sudhaakar 14. Tina Tsou 15. Thomas Watteyne 16. Xavi Vilajosana 17. Xavier Lagrange Recording - Webex recording (audio+slides,streaming) - https://cisco.webex.com/ciscosales/lsr.php?AT=pb&SP=MC&rID=71053472&rKey=9829fc81dd628028 *[63min]* Slides - slides_130830_webex.ppt: slides shared during the call Agenda - Administrivia *[4min]* - Agenda bashing - Approval minutes - Charter submitted - IETF MLs down 3pm-12am 08/28 - Vancouver: Hyatt hotel registration link - Logo update - Flow Identification *[20min]* - 4 flows? - how to trigger a schedule update? - confirmation message? - Network bootstrapping *[20min]* - Synchronization and neighbor discovery *[Pouria]* - Time parent selection and EB priority *[Xavi]* - Impact of routing loops on synchronization? *[Pascal]* - Fast Join/Synchronization *[Alfredo, 10min]* - AOB *[1min]* Minutes - *[08.04]* Meeting starts - *[08.04]* Administrivia - Agenda bashing No issues raised. Agenda approved. - Approval minutes last call. No issues raised. Minutes approved. - Charter submitted - Adopted name 6TiSCH. - Charter submitted. No answer yet. - Loss of e-mail in all IETF mailing list on Wed 08/28 3pm-12am midnight PDT. Action item: [all] verify outbox and resend any email not in the ML archives ( http://www.ietf.org/mail-archive/web/6tsch/current/maillist.html) - Vancouver: - Hotel eservation can be done by web at https://resweb.passkey.com/go/ietf88. - Logo update Action item: [Xavi] to redo logo. - *[08.10]* Flow Identification - 4 flows? - Flow between and ME and nodes and vice-versa - ME is the service that manages the schedule. - 4 flows: - Action - Query - Not clear what we want to ask for an specific cell. - READ.cell: what are the attributes to query? Information about the usage of the cell? - Information should be configurable. - Report - Event - *[Thomas]* Simplification: Report and Query have common elements. For common elements, instead of a query, we could add an action which triggers a report. - *[Xavi]* Do we need to define everything or define basic elements of Query Flow and provide TLV for more specific elements - *[Pascal]* +1. Very common the standards - *[Thomas]* +1. Anybody disagrees? No issue raised on the call. - how to trigger a schedule update? - Event Flow: what do we consider as an event. How to trigger a schedule update? - Part of event flow. - 5th request flow: enable a transport mechanism to transport the request to the ME. Action item: [Pascal] To start a thread on the ML to answer whether we want a 5th flow or not. - confirmation message? - When a node sends a Requests to the ME, how does it know that it arrived? - Options: - Do nothing (best effort) - Rely on Transport e.g CoAp and Confirmable msg - App-Level ACk - Use another flow (e.g action flow) - *[Maria Rita]* Let's be cautious not to make things too complicated. Action item: [Qin] to continue discussion on the ML. - *[08.35]* Network bootstrapping - Synchronization and neighbor discovery - *Pouria* presents his slide with sequence of echanges between layers and nodes. Note: slides taken from http://www.ietf.org/mail-archive/web/6tsch/current/msg01156.html. - Temporary time parent selected among neighbors heard. Then, when RPL selects the best parent, may change time source to be the RPL parent. - *[Pascal]* - is it possible that we have multiple instances of RPL and the management of multiple different RPL instances and time sources might be complicated as some of the time sources might not be in all RPL instances. - A node might belong to multiple instances of RPL, you can listen to other parents in different RPL instances. - How to signal or enforce that a RPL instance is for synchronization because there is a node with GPS? - With multiple instances only one is used for synchronization. - *[Thomas]* What characteristics do we want the the synchronization RPL instance to have? - *[Pascal]* 3rd RPL model: multiple roots, on DODAG. If you want to send data to the roots, you need them to be grounded. - *[Raghuram]* Why couple RPL routing parents with TSCH time source neighbor? Might be a layer violation. - *[Pascal]* only using info opaque information from the other layer - *[Pascal]* We benefit from the loop-free nature of the RPL DAG. - *[Alfredo]* If we have a many neighbor nodes that send the EBs for synchronization, this goes in many different channels, to deal with that we can have some coordination to select the right parent to join. Would that not be on the direction of having a RPL instance for Synchronization? Action item: [Thomas]: to start a thread on the ML about that topic. - *[08.58]* Fast Join/Synchronization - Ideas about fast join synch on TSCH - When a node joins a network, it needs to wait for the EB. During this time, the radio is on and spends energy. Also this can take some time as the CH sequence is not known in advance. - After node joins, synchronization is kept with KA, EBs... - Average Join Time: depends on many parameters (number of channels, Ch. Avg time between EBs amongst neighbors, etc) - Assumptions: - one synchronizer node exists. - this node is powered with the mains. (no battery powered). Realistic assumption. - A node that is synchronized sends EB every M slotframes. - See plots in the slides. - Issues: - How many EBs should the synchronized node send? - How to choose the slotframe cell? - Detect end of bootstrap phase. - *[Thomas]* this might be useful both for synchronization and for the continuous neighbor discover once all nodes have joined. - *[Alfredo]* Agreed. - *[09.06]* AOB No other business is brought up. - *[09.07]* Meeting ends --047d7b5da81fe934ba04e52db85c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    You will find the minut= es of today's webex below.

    FYI, all the minute= s and slides are archived a https://bitbucket.org/6tsch/meetings/.

    Thanks to Xavi and Dominique for taking notes!

    As usual, fix anything we might have missed directly in th= e e-mail and reply. We will approve and adopt the minutes at the next call.=

    Thomas

    ---

    Minutes Webex 30 August 2013, 6TiSCH group

    Note: timestamps in PDT.

    Taking notes=A0(using Etherpad)

    1. Xavi Vilajo= sana
    2. Dominique Ba= rthel
    3. Th= omas Watteyne

    Present=A0(alphabetically)

    1. Alfredo Grieco
    2. Diego Dujovn= e
    3. Domini= que Barthel
    4. Geraldine Texier
    5. Laurent Toutain
    6. Maria Rita Palattella
    7. Oliver Hahm
    8. Pascal Thubert
    9. Patrick Wetterwald
    10. Pieter de Mil
    11. Pouria Zand
    12. Qin Wang
    13. Raghuram Sudhaakar
    14. Tina Tsou
    15. Thomas Watteyne
    16. Xavi Vilajosana
    17. Xavier Lagrange

    Recording

    Slides

    Agenda

    • Administrivi= a=A0[4min]
      • Agenda bashing
        • Approval minutes
      • Charter submitted
      • IETF MLs down 3pm-12am 08/28
      • Vancouver: Hyatt hotel registration link
      • Logo update
    • Flow Identification=A0[2= 0min]
      • 4 flows?
      • how to trig= ger a schedule update?
      • confirmation message?
    • Network bootstrapping=A0[20min]
      • Synchronization and neighbor discovery=A0[Pouria]
      • Time parent selection an= d EB priority=A0[Xavi]
      • Impact of routing loops on synchronization?=A0[Pascal]
    • Fast Join= /Synchronization=A0[Alfredo, 10min]
    • AOB=A0[1min]

    Minutes

    • [08.04]<= /em>=A0Meeting starts
    • [08.04]=A0Administrivia
      • Agenda bashi= ng

        No issues raised. = Agenda approved.

      • Approval minutes last call.

        No issues raised. = Minutes approved.

      • Charter submitted
        • Adopted name= 6TiSCH.
        • Charter submitted. No answer yet.
      • Loss of e-mail in all IETF mailing list on Wed 08/28 3pm-12am midnight PDT.=

        Action item: [all]= verify outbox and resend any email not in the ML archives (http://www.ietf.or= g/mail-archive/web/6tsch/current/maillist.html)

      • Vancouver:
      • Lo= go update

        Action item: [Xavi= ] to redo logo.

    • [08.10]=A0Flow Identification
    • 4 flows?
      • Flow between and ME and nodes and vice-versa<= /li>
      • ME is the se= rvice that manages the schedule.
      • 4 flows:
        • Action
          • <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word">Query
          • Not clear what we want to ask for an specific cell.
          • READ.cell: what are the attribu= tes to query? Information about the usage of the cell?
          • Information should be configurable.
        • Report
        • Event
      • [Thomas]=A0Simplification: Report and Query have common el= ements. For common elements, instead of a query, we could add an action whi= ch triggers a report.
      • [Xavi]=A0Do we need to define everything or define basic e= lements of Query Flow and provide TLV for more specific elements
      • [Pascal]=A0+1. Very common the standards
      • [Tho= mas]=A0+1. Anybody disagrees?

        No issue raised on= the call.

    • how to trigger a schedule update?
      • Event Flow: = what do we consider as an event. How to trigger a schedule update?
      • Part of event fl= ow.
      • 5th request = flow: enable a transport mechanism to transport the request to the ME.

        Action item: [Pasc= al] To start a thread on the ML to answer whether we want a 5th flow or not= .

    • confirmation message?
      • When a node sends a = Requests to the ME, how does it know that it arrived?
      • Options:
        • Do nothing (best effort)
        • Rely on Transpor= t e.g CoAp and Confirmable msg
        • App-Level AC= k
        • Use an= other flow (e.g action flow)
      • [Maria Rita]=A0Let's be cautious not to make things to= o complicated.

        Action item: [Qin]= to continue discussion on the ML.

  • [08.35]= =A0Network bootstrapping
    • Synchronizat= ion and neighbor discovery
        Pouria<= /strong>=A0presents his slide with sequence of echanges between layers and = nodes.

        Note: slides taken= from=A0http://www.ietf.org/mail-archive/web/6tsch/current/msg01156.html.<= /p>

      • Temporary time parent selected among neighbors heard. Then, when RPL = selects the best parent, may change time source to be the RPL parent.
      • [Pas= cal]
        • is it possible that we have = multiple instances of RPL and the management of multiple different RPL inst= ances and time sources might be complicated as some of the time sources mig= ht not be in all RPL instances.
        • A node might= belong to multiple instances of RPL, you can listen to other parents in di= fferent RPL instances.
        • How to signal or enforce that a RPL instance is for synchronization because= there is a node with GPS?
        • With multiple instances only one is used for synchroniza= tion.
      • [Thomas]=A0What characteristics do we want the the synchroni= zation RPL instance to have?
      • [Pascal]=A03rd RPL model: multiple roots, on DODAG. If you= want to send data to the roots, you need them to be grounded.
      • [Raghuram]=A0Why couple RPL routing parents with TSCH time source neighbor? Mi= ght be a layer violation.
      • [Pas= cal]=A0only using info opaque information from the other layer
      • [Pa= scal]=A0We benefit from the loop-free nature of the RPL DAG.
      • [Alf= redo]=A0If we have a many neighbor nodes that send the EBs for syn= chronization, this goes in many different channels, to deal with that we ca= n have some coordination to select the right parent to join. Would that not= be on the direction of having a RPL instance for Synchronization?

        Action item: [Thom= as]: to start a thread on the ML about that topic.

    • [08.58]=A0Fast Join/Synchronization
      • Ideas about fast join synch on TSCH
      • When a node joins a network, it needs to wait for the EB. During this time,= the radio is on and spends energy. Also this can take some time as the CH = sequence is not known in advance.
      • After node joins, synchronization is kept with KA, EBs...
      • Average Join Time: depend= s on many parameters (number of channels, Ch. Avg time between EBs amongst = neighbors, etc)
      • Assumptions:=
        • one synchronizer node exists.
        • this node is powered with the mains. (no battery powered). Realistic assump= tion.
        • A = node that is synchronized sends EB every M slotframes.
        • See plots in the slides.
        • Issues:
          • How many EBs shou= ld the synchronized node send?
          • How to choos= e the slotframe cell?
          • Detect end of bootstrap phase.
      • [Thomas]=A0this might be useful both for synchronization a= nd for the continuous neighbor discover once all nodes have joined.
        • [Alfred= o]=A0Agreed.
    • [09.06]=A0AOB

      No other business = is brought up.

    • [09.07]=A0Meeting ends
    • --047d7b5da81fe934ba04e52db85c-- From xvilajosana@berkeley.edu Fri Aug 30 10:42:16 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 45ECC21F9EB8 for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:42:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.715 X-Spam-Level: X-Spam-Status: No, score=-2.715 tagged_above=-999 required=5 tests=[AWL=0.261, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ifbDB4OR7h4z for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:42:12 -0700 (PDT) Received: from mail-pb0-f45.google.com (mail-pb0-f45.google.com [209.85.160.45]) by ietfa.amsl.com (Postfix) with ESMTP id 0F12F11E8111 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:42:12 -0700 (PDT) Received: by mail-pb0-f45.google.com with SMTP id mc17so2154569pbc.32 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:42:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:date:message-id:subject :from:to:content-type; bh=tSYyLMbqkyBeF2I92WhxuUBR+AuCaDFQ4PIWldKfFqc=; b=Xx3he0UxuQLTyQa0+yX7SiUtFzA9e6k2O2U5UlWtJyKr9F40GpGRsSrCkESJ8PQXTT CNjENe69z+xQSV3j/XL1dq8vEMXGdn0KWScXIvt+paX+HqXDqM9nxaZDH86rt33jPWHi /vBMifDshZv9CDSDqz6dbT+srfMfpo33q1iYKTPhZwB4xWMma7/aQ6Sjk1JBSGaXH4RB 1L8YmzxvbPlXihjomEZFW5ingJaWf4076WzuzZiLr503AqdvtDkftHXZCaBSOyOSb/E7 Uclyo7r6OO3rjOZDH8NdHL2CNOf+owRCfWh05Ad7TzD4qYJ0wcihhdRmL1uLTeVk2AOS WaEQ== X-Gm-Message-State: ALoCoQmqpyuOtduRDIAi7E5Bo/bcTxR/iGen1Ibdp7P8gBqzvm+4T5otV/d/cW5FmHyMWlyRfxcJ MIME-Version: 1.0 X-Received: by 10.68.36.132 with SMTP id q4mr11357414pbj.118.1377884531802; Fri, 30 Aug 2013 10:42:11 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Fri, 30 Aug 2013 10:42:11 -0700 (PDT) Date: Fri, 30 Aug 2013 10:42:11 -0700 Message-ID: From: Xavier Vilajosana Guillen To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=bcaec52162590f4e7404e52dbe61 Subject: [6tsch] new logos X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Aug 2013 17:42:16 -0000 --bcaec52162590f4e7404e52dbe61 Content-Type: text/plain; charset=ISO-8859-1 Dear all, the new logos are available at https://bitbucket.org/6tsch/meetings/src/master/logo. kind regards, Xavi --bcaec52162590f4e7404e52dbe61 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Dear all,

    the new logos are available a= t

    kind regards,
    Xavi
    <= span style=3D"font-family:arial,sans-serif;font-size:12.727272033691406px">=

    --bcaec52162590f4e7404e52dbe61-- From twatteyne@gmail.com Fri Aug 30 10:43:45 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5D3E421E805F for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:43:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.889 X-Spam-Level: X-Spam-Status: No, score=-1.889 tagged_above=-999 required=5 tests=[AWL=0.088, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yRrFWhkq5ior for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:43:44 -0700 (PDT) Received: from mail-pd0-x231.google.com (mail-pd0-x231.google.com [IPv6:2607:f8b0:400e:c02::231]) by ietfa.amsl.com (Postfix) with ESMTP id CD61D11E8119 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:43:44 -0700 (PDT) Received: by mail-pd0-f177.google.com with SMTP id y10so2117555pdj.8 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:43:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=WcUKdYM948BtIIiSdRvFidVvtQ7FVV0WAnA8KcaK4rQ=; b=wLmvUa2iGz/Rpn8wQ+PD8ANurWpNZ1eEL892pI22aw5Wc/zLHUUaf9NcV83yPzJ7fz Vd9d7937fPrYV/G/s5y21PtyqiyW8EXSTxR+BQdPFnvZ/6TS8qjEi/jBSz1MrG78wlJ+ Rb1zblw9c6jkauZOBjnZm7m7ghGCPbrmcampvWxggeJkcB2hSTNFjrIvkv8uMROpInA6 KAb1vlTM2n4HjTWNDuw80XGyRgPNg23wr88dfHrSpqZYlx0nutJK24eRhBKfPLwE55Ig KCibemntb5wa/98zveW2jggaD7cImEjr05FBII8TBvN91FQMT6TxJlcUQKZvQ8oVMryb 5G/w== X-Received: by 10.66.150.41 with SMTP id uf9mr12032709pab.108.1377884624500; Fri, 30 Aug 2013 10:43:44 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 30 Aug 2013 10:43:24 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Fri, 30 Aug 2013 10:43:24 -0700 X-Google-Sender-Auth: 0gxiVLtYEtHnP4C0-_eB8_QNbB4 Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b6d7f1495bf1e04e52dc305 Subject: Re: [6tsch] new logos X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Aug 2013 17:43:45 -0000 --047d7b6d7f1495bf1e04e52dc305 Content-Type: text/plain; charset=ISO-8859-1 Fantastic, thanks for the quick action! On Fri, Aug 30, 2013 at 10:42 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Dear all, > > the new logos are available at > https://bitbucket.org/6tsch/meetings/src/master/logo. > > kind regards, > Xavi > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b6d7f1495bf1e04e52dc305 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Fantastic, thanks for the quick action!


    On Fri, Aug 30, 2013 at 10= :42 AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.e= du> wrote:
    Dear all,

    the new logos are available at

    kind regards,
    Xavi



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b6d7f1495bf1e04e52dc305-- From qinwang@berkeley.edu Fri Aug 30 10:45:13 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5A1AE21F9E39 for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:45:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.041 X-Spam-Level: X-Spam-Status: No, score=-2.041 tagged_above=-999 required=5 tests=[AWL=-0.827, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, MISSING_SUBJECT=1.762, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pd8WmojbX0UJ for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:45:08 -0700 (PDT) Received: from mail-vb0-f52.google.com (mail-vb0-f52.google.com [209.85.212.52]) by ietfa.amsl.com (Postfix) with ESMTP id CCB7021F9CA8 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:45:06 -0700 (PDT) Received: by mail-vb0-f52.google.com with SMTP id f12so1481507vbg.39 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:45:05 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=HlW9/NbMWRs9CQhtHGotU65/ygghcQOLq2CMqjxVrww=; b=jD7PGRosnDYc1GeIXtb4DlieXx2So08qfXtQnE3WN1iVbmN/bV4AqSZv/bH9bq0xnG t3Y0jsDs3SY8LgsPrOwI7dhgeaiwJmKRSGE8UbiTJvU8FaMcHFgveK9C4mYo1GYuLf83 vYqcHDCQ4s1fAvA4zbmzJLsJhjKJ+U9zjPV1uMjIeGDgxzEv0+AIuSOyMsVch17SaxOS Vl4qMME03Lqu9zWToD5D+Hgy73wp6Bk/T8hXlF8lLOlBsrITq9Z4HljfjE6EbJC1YsN3 cs1Mq7k/OSNY/WBIKVKAzbF7fYH5b11fGj3lfwwrYkvtN+Gk8Qbm7G4aqxMptE9lTQnC JM2Q== X-Gm-Message-State: ALoCoQllQizKr8xUEdPOuoIeL1hlzMIY04Lq+hfCKjAIEfVyUpqt5bpO+hx7hhzCHdv0rlum+pBy MIME-Version: 1.0 X-Received: by 10.220.91.16 with SMTP id k16mr8322995vcm.21.1377884705162; Fri, 30 Aug 2013 10:45:05 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Fri, 30 Aug 2013 10:45:05 -0700 (PDT) Date: Sat, 31 Aug 2013 01:45:05 +0800 Message-ID: From: Qin Wang To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b343f1a64909404e52dc8dc Subject: [6tsch] (no subject) X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Aug 2013 17:45:13 -0000 --047d7b343f1a64909404e52dc8dc Content-Type: text/plain; charset=ISO-8859-1 Hi all, In this thread, we will continue the discussion about Confirmation message. Here is some background information. Context: e.g. - node sends a report and want to know if the report is accepted., - ME sends a action request and want to know if/when the action taken. Options: (1) Nothing (2) Rely on transport mechanism (e.g. confirmable CoAP message) (3) App-level ACK type (4) Use different flow (i.e. action flow) IMHO, different control flow may have different requirement for confirmation message. (1) Action Flow, needs a App-level confirmation, like Succ/Fail (2) Query Flow, automatically has the confirmation, i.e. the message packet corresponding to a specific query. (3) Report Flow and Event Flow, option (1)-(3) are OK, but I prefer option (1) and (3), i.e. the confirmation message is an option, but if a confirmation message is needed, it should be App-level Ack, instead of transport layer confirmation, which will give 6top more flexibility. What do you think? Thanks Qin --047d7b343f1a64909404e52dc8dc Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi all,

    In this thread, we will continue the discussion about Confirmation message. He= re is some background information.

    <= /span>
    Context: e.g.
    =A0 =A0 - node sends a report and want to know if the= report is accepted.,=A0
    =A0 =A0 - ME sen= ds a action request and want to know if/when the action taken.
    Options:
    =A0 =A0(1= ) Nothing
    =A0 =A0(2) Rely on transport mechanism (e.g. confirma= ble CoAP message)
    =A0 =A0(3) App-level AC= K type
    =A0 =A0(4) Use different flow (i.e. action flow)

    IMHO, different control flow may have di= fferent requirement for confirmation message.
    =A0 =A0 (1) Action Flow, needs a App-level confirmation, like Succ/F= ail
    =A0 =A0 (2) Query Flow, automatically has the confirm= ation, i.e. the message packet corresponding to a specific query.
    =A0 =A0 (3) Report Flow and Event Flow, option (1)-(3) are= OK, but I prefer option (1) and (3), i.e. the confirmation message is an o= ption, but if a confirmation message is needed, it should be App-level Ack,= instead of transport layer confirmation, which will give 6top more flexibi= lity.

    What do you th= ink?

    Thanks<= /div>
    Qin
    =A0 =A0=A0
    --047d7b343f1a64909404e52dc8dc-- From qinwang@berkeley.edu Fri Aug 30 10:47:37 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E816111E80FA for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:47:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.901 X-Spam-Level: X-Spam-Status: No, score=-2.901 tagged_above=-999 required=5 tests=[AWL=0.075, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bckMd+f1C8fY for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 10:47:32 -0700 (PDT) Received: from mail-vb0-f49.google.com (mail-vb0-f49.google.com [209.85.212.49]) by ietfa.amsl.com (Postfix) with ESMTP id 973CF11E8111 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:47:32 -0700 (PDT) Received: by mail-vb0-f49.google.com with SMTP id w16so1496914vbb.8 for <6tsch@ietf.org>; Fri, 30 Aug 2013 10:47:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=XX0iR7dbjUibMrzxEkPquMFEAGZjDtmW8Kjb/vXWMvg=; b=aQJJe4q5Dekc7gzRxGat61yFydlv4lshpEr230ulKtoqkEhjJUX5zh8C+YxZ9JQWNH ujH5SibELeYkQiDW6EmrFPFffGB3lGfo4KWzv4Rj/a/nWl7ME/46kdhn1JIQ2qAEiX3H cmjW7D6xnroVg7O1enxF1/87jLz81cFwWD4x3UgXG9Ehged7yOvhWwusYRbkJaVlZ5we EsRh53T87ok4XTpRIrZMtuOy3hnqn8Q3NRpEznkkolIHE3QOVYlM5+DwFFHguGmSINwO Y2pNljkEpVHrP91Z6QGdHytZeM1IQMTElvwnKwPwasHLzGY3p0/EtxMV1cjZlqDzYupB xibA== X-Gm-Message-State: ALoCoQnNyT08wdVu4RZRP9ZtM1DyoLdt04MZQchkDo8dUGMAMS6W9l+DePsTpNnobpf6MkmU7L2U MIME-Version: 1.0 X-Received: by 10.220.181.136 with SMTP id by8mr9455062vcb.11.1377884852074; Fri, 30 Aug 2013 10:47:32 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Fri, 30 Aug 2013 10:47:32 -0700 (PDT) Date: Sat, 31 Aug 2013 01:47:32 +0800 Message-ID: From: Qin Wang To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7bf0f67a26794804e52dd143 Subject: [6tsch] Confirmation Messages? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Aug 2013 17:47:38 -0000 --047d7bf0f67a26794804e52dd143 Content-Type: text/plain; charset=ISO-8859-1 Hi all, In this thread, we will continue the discussion about Confirmation message. Here is some background information. Context: e.g. - node sends a report and want to know if the report is accepted., - ME sends a action request and want to know if/when the action taken. Options: (1) Nothing (2) Rely on transport mechanism (e.g. confirmable CoAP message) (3) App-level ACK type (4) Use different flow (i.e. action flow) IMHO, different control flow may have different requirement for confirmation message. (1) Action Flow, needs a App-level confirmation, like Succ/Fail (2) Query Flow, automatically has the confirmation, i.e. the message packet corresponding to a specific query. (3) Report Flow and Event Flow, option (1)-(3) are OK, but I prefer option (1) and (3), i.e. the confirmation message is an option, but if a confirmation message is needed, it should be App-level Ack, instead of transport layer confirmation, which will give 6top more flexibility. What do you think? Thanks Qin --047d7bf0f67a26794804e52dd143 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi all,

    In= this thread, we will continue the discussion about Confirmation message. H= ere is some background information.

    Context: e.g.
    =A0 =A0 - node sends a report a= nd want to know if the report is accepted.,=A0
    =A0 =A0 - ME sends a action request and want to know if/when the action ta= ken.
    Options:
    =A0 =A0(1) Nothing
    =A0 =A0(2) Rely on transpo= rt mechanism (e.g. confirmable CoAP message)
    =A0 =A0(3) App-level ACK type
    =A0 =A0(4) Use different flow (i.e. action flow)

    IMHO, different control flow may have different requirement f= or confirmation message.
    =A0 =A0 (1) Action Flow, needs a App-level confirmation, like Succ/Fail
    =A0 =A0 (2) Query Flow, automatically has the confirmation, i.e. the messa= ge packet corresponding to a specific query.
    =A0 =A0 (3) Report Flow and Event Flow, option (1)-(3) are OK, but I prefe= r option (1) and (3), i.e. the confirmation message is an option, but if a = confirmation message is needed, it should be App-level Ack, instead of tran= sport layer confirmation, which will give 6top more flexibility.

    What do you think?

    Thanks
    Qin
    =A0 =A0=A0
    --047d7bf0f67a26794804e52dd143-- From qinwang@berkeley.edu Fri Aug 30 11:01:36 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2DD0321F9D45 for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 11:01:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.603 X-Spam-Level: X-Spam-Status: No, score=-2.603 tagged_above=-999 required=5 tests=[AWL=-0.227, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_34=0.6, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xzk3H1mRqgQy for <6tsch@ietfa.amsl.com>; Fri, 30 Aug 2013 11:01:32 -0700 (PDT) Received: from mail-vb0-f41.google.com (mail-vb0-f41.google.com [209.85.212.41]) by ietfa.amsl.com (Postfix) with ESMTP id B889D21F9D70 for <6tsch@ietf.org>; Fri, 30 Aug 2013 11:01:31 -0700 (PDT) Received: by mail-vb0-f41.google.com with SMTP id g17so1525464vbg.14 for <6tsch@ietf.org>; Fri, 30 Aug 2013 11:01:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=eSr/Ntu9A4K7YAZoPYouoPoBOgxraDZykVux0NW3YVI=; b=LgDNw78s7eJkHQBjc9IrJlCOp9JMR1hTH2Ftmfm48hjrCRmm6tZwhlEYNsMPdgwF4x 4/uIwp1cYCbVRcqXsLrmgZDYd5eAxMKC4rdHDDlD+X17bQhCz/o5BAEKRZWyeNZqiu2S 2LL9jUk3Qtl4ZwESvfrSbx6NrQ0p79pwBOYNfvQ4Z2BVJqusjKrg/WitoBNwi74crvQm XajA302e/RecnoYWpJT1B+NOYh37Fn5bouUuL1Ja4vZ9ybOk6M85ncjrBNaQ6rxCR+bC Fw/pJX3Hzw1zb4bfxgsGCrfrzyzzfHsvwyVYg2/Zw5jV3suXOUV+0LfBEfUNnJljxFUh nNzw== X-Gm-Message-State: ALoCoQl8THYRTiU+wNBIrzZ7kHsdHsShAcljDyZL/2MVXh05inuvNMYJ+AISVjWpqBjp7BxNGheQ MIME-Version: 1.0 X-Received: by 10.58.230.135 with SMTP id sy7mr1078vec.42.1377885691186; Fri, 30 Aug 2013 11:01:31 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Fri, 30 Aug 2013 11:01:31 -0700 (PDT) In-Reply-To: References: Date: Sat, 31 Aug 2013 02:01:31 +0800 Message-ID: From: Qin Wang To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=047d7bdc87be2a1cd204e52e0336 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] About the special type of event to ask PCE to create a track X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Aug 2013 18:01:36 -0000 --047d7bdc87be2a1cd204e52e0336 Content-Type: text/plain; charset=ISO-8859-1 Hi Pascal, My understanding is that 6top is a passive role in dealing with cell/track reservation. In another word, the 6top in a node can report its state, including neighbor table, cell usage, and other statistics information, but can not make decision on if some cells/track should be added or removed, which should be the responsibility of PCE in centralized case or upper layer in distributed case. Thus, I can not see when the 5th flow will be used. Can you explain more? Thanks Qin On Sat, Aug 31, 2013 at 12:08 AM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Dear all, > > We discussed at the call that the(PCEP?) request to ask for a track > establishment could be seen as an event, or could be a new flow. > At the call, I suggested that it could be a new, 5th flow. My arguments > are that this flow: > - Probably yields different data format. The demand carries and points, > end to end latency and bandwidth. That's quite specific. > - Probably yields a different flow. Events do not necessarily have a > response. > - Probably uses a different transport as well (PCEP vs. CoAP) > > What do you think? > > Pascal > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > --047d7bdc87be2a1cd204e52e0336 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Pascal,

    My understanding is that 6to= p is a passive role in dealing with cell/track reservation. In another word= , the 6top in a node can report its state, including neighbor table, cell u= sage, and other statistics information, but can not make decision on if som= e cells/track should be added or removed, which should be the responsibilit= y of PCE in centralized case or upper layer in distributed case. Thus, I ca= n not see when the 5th flow will be used. Can you explain more?

    Thanks
    Qin


    On Sat, Aug 31, 2013 at 12:08 AM, Pa= scal Thubert (pthubert) <pthubert@cisco.com> wrote:
    Dear all,

    We discussed at the call that the(PCEP?) request to ask for a track establi= shment could be seen as an event, or could be a new flow.
    At the call, I suggested that it could be a new, 5th flow. My arguments are= that this flow:
    - Probably yields different data format. The demand carries and points, end= to end latency and bandwidth. That's quite specific.
    - Probably yields a different flow. Events do not necessarily have a respon= se.
    - Probably uses a different transport as well (PCEP vs. CoAP)

    What do you think?

    Pascal
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    --047d7bdc87be2a1cd204e52e0336--
    All,

    Summarizing the different things we are talking about in this thread:<= /div>
    1. picking time source neighbors during the operation of the network. = Proposal is to use the (loop-free) RPL DAG. Challenged by Raghuram who want= s to have separate L2 and L3 behavior because of race conditions.
    2. picking time source neighbors during join process. Proposal is to a= ttach to the node which indicates the lowest join priority in EB. Question = is whether join priority reflects DAGrank or not.
    3. multiple DODAGs: keeping DAGroots sync'ed or participating in sever= al independent time bases.

    My opinion is:
    1. I believe keeping the same DAG structure the same between L2 and L3= makes sense. If there is no L2 connectivity, L3 cannot function since it c= an not speak to and hear the neighbors, so I'm afraid I don't quite follow = the race condition issue.
    &nb= sp;I support the idea of keeping the same DAG structure between L2 and L3.&= nbsp;
    To = explain what I was referring to -
    The RPL trickle tim= er period can very easily become a large value if the network is static. In= this time if a node does switch off, it is most like that L2 will detect i= t first since it would have received EB from its current parent. Now if we force it that the RPL parent has to = be the timing parent we cannot find a timing parent until L3 detects the to= pology change. If we allow L2 to initiate a join process and choose a new t= iming parent and inform L3 we may be violating the RPL OF. This is the situation that I was referring to. I = feel that there is a fair probability of this happening. Thoughts ?<= /div>

    To address this we = probably need to allow RPL to change the topology based on the OF, after L2= join has occurred. Then L2 can change its timing parent to be synced with = DAG structure. 

    2. My inclination is to have the join priority be an indication of the= DAGrank, possible by "rounding off". When joining, a new node wi= ll join L2 (i.e. synchronize) as soon as it hears EBs, then join L3 (i.e, a= cquire a DAGrank) after hearing DIOs. I would have the node transmit EBs only after that last step.

    3. My opinion is that, for now, we should take the multiple root case = into account, but only if they are synchronized through some out-of-band me= chanism.


    Raw opinions, up for discussion :)

    Thomas

    On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert= (pthubert) <pthubert@cisco.com> wrote:

    Dear Qin:

     

    I think the idea was to make sure = that the roots are synchronized.

    Certainly the DODAGs may be a bit = out of sync as we progress down, but we expect that the guard time is suffi= cient.

    The alternate would be to sync the= whole network completely independent of RPL DAGs etc=85 eg using a GPS.=

    There might be use cases where tha= t is fine, but we need to document a default behavior that does not make th= e assumption of a GPS or similar.

     

    Makes sense?<= /p>

     

    Cheers,

     

    Pascal

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 19:03


    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

     

    Pascal,

     

    It may bring in some complexity. Think about the cas= e. DODAG1 and DODAG2 are in a same instance, but have no shared nodes, thus= may not be able sync with each other.  A new node (node-A) comes in, = wants to join into the two DODAGs, in another word, want to jump between the two DODAGs.  I believe node-A has to c= hange its time source parent and re-sync when it jump from one DODAG to ano= ther. Right?

     

    Thank

    Qin

     

     

     

     <= /p>

    On Fri, Aug 23, 2013 at 12:15 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    I do not think so, Qin;

     

    but it is required that a node on = one DODAG may jump onto the other, and to do that, it is useful to monitori= ng candidates from both dodags.

    Note that DODAGs partition the net= work, and all the parents must be in one of them.

     

    Cheers;

     

    Pascal

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: jeudi 22 ao=FBt 2013 17:54
    To: Pascal Thubert (pthubert)
    Cc: xvilajosana@eecs.berkeley.edu; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] time parent selection based on EB priority

     

    Hi Pascal,

     

    Is it assumed that 2 DODAG in a same instance must h= ave at least one shared node?

     

    Thanks

    Qin

     <= /p>

    On Thu, Aug 22, 2013 at 11:11 PM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

     

    The problem is that we have 2 mech= anisms that establish a distance to the root in order to avoid loops, RPL R= ank and 4e priority.

    Fact is, RPL is probably more elab= orate for loop detection and loop avoidance. I suspect that the priority ca= n easily count to infinity.

    So I=92d trust RPL Rank rather tha= n priority, and we seem to agree that we want to time sync with RPL parents= .

     

    a) My question is whether it makes= sense and value to have a transition between a time source based on best (= hop count) priority and to one based on best RPL Rank, or if we could use the rank right away. Seems to me that= life would be easier if we use the Rank right away, though it may make the= network a bit slower to come up. Passing from one mode to the other will d= emand some specifications, what if one node reboots and goes from one mode to the other, etc=85<= /u>

     

    Now if the question is to reuse th= e priority field, then we can do actually change the logic to accommodate p= riority =3D DAGRank(Rank) for nodes that are not root, still ensuring that only a node that is already part of a RP= L DAG may be used as time source.

    Initially only the root would be p= riority 0. All the others would be default 255 (that is DAGRank(INFINITE_RA= NK) assuming MinHopRankIncrease of 255)

    From there, all nodes that are one= hop away from root with good RSSI can sync with the root, and listen to DI= Os, and emit their own, and set their own priority to DAGRank(Rank) that is < 255.

    Children sync to whichever prio &l= t; 255 neighbor as time source, listen to DIOs, select a parent, migrate to= that parent as time source, and then can set their own priority to zero and send DIOs. If later they select a bette= r parent the priority will get lower so that=92s till OK.<= /u>

    Wou= ld that fly?

    b) about multiple DAGs, there are = 2 cases:

    - 2 DODAGs in a same instance. We = said we want to support that, and that implies that the various DODAGs are = closely time sync=92d.

    - 2 DODAGs in 2 different instance= s. To be discussed. We have use cases where that could be useful, one insta= nce playing basic slotted aloha and the other doing more critical jobs.

     

    We have not agreed on the latter b= ut with a single radio, it seems problematic if the 2 instances do not shar= e a same sense of time. We=92d end up with slot frames that may drift from one another, sometimes overlapping=85= I suspect that we=92d partition time inside a slot frame or using multiple= slot frames, but we=92d keep them in sync. Probably there is a need for a = spanning instance (0) for (autonomic) management etc=85 that uses something very simple, always on, very much li= ke your basic draft. If there is such a spanning instance, then it can be u= sed to sync everyone, in which casethe Rank from the dependent instances is= not used for time sync.

    What do others think?

     

    Pascal

     

    From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berke= ley.edu]
    Sent: jeudi 22 ao=FBt 2013 15:34
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] time parent selection based on EB priority

     

    Hi Pascal,

     

    my comment inline:

     

    [Pascal] Yes, I read Xavi=92s prop= osal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the = time sync tree faster than the RPL graph?

     

    If no, maybe me could use the prio= rity as a boolean to mean that the node is already part of the RPL DAG and = may be used as time source.

    Initially only the root would be p= riority 0. All the others would be default 1.

    From there, all nodes that are one= hop away from root with good RSSI can sync with the root, and listen to DI= Os, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 = neighbor as time source, listen to DIOs, select a parent, migrate to that p= arent as time source, and then can set their own priority to zero and send DIOs.

    Wou= ld that fly?

    yes that would work but we are doing the same= as the IEEE802-15.4e Join priority field is for. The 15.4e defines this me= chanism and it is inherent to the networks we address so using it is straightforward. Then as described by Thomas, we= only need to use RPL best parent as soon as we have one instead of the low= est prio neighbor. 

    Another question with time sources is the sel= ection of a time source parent in the case that a node belongs to more than= one DODAG. Which parent is selected then? An more importantly, do the basic draft considers having more than one DOD= AG? 

    thanks!
    Xavi

     <= /p>

    On Thu, Aug 22, 2013 at 2:59 AM, Pascal Thubert (pth= ubert) <pthubert= @cisco.com> wrote:

    Dear all:

     

    As you know, RPL may entail tempor= ary loops, in particular if DAGMaxRankIncrease is not configured to 0.

    If as we expect we use the RPL pre= ferred parent tree for time sync, this will lead to time sync loops.

    Two questions here:<= u>

    1) how bad is the effect of such l= oop? I expect that the clocks  will derive rapidly, as if from the per= spective of a node the crystal was real, real bad.

    2) can we detect that effect and u= se it to detect a loop in the routing?

     

    Please see inline:

     

    sch] time parent selection based on EB priority

     

    Qin, Xavi,

     

    Excellent point. I believe that this is exactly what= makes this 6TSCH work so interesting: figuring out how consolidate the vie= ws between upper and lower layers.

     

    In my mind, the join priority as you describe looks = very much like a DAGrank. I believe there are, however, two potential quest= ions we should not forget:

    - what if the joining mote does no get all of the EB= s of its neighbor?

    - what happens when the topology changes and a node = moves up or down in the DODAG?

     

    I would suggest the following:

    - once the node has fully joined, somehow tie the jo= in priority to its RPL DAGrank. We might have to play with the metric to ma= ke the join priority look like a hop count, but I believe it is important t= he announced join priority changes when the mote moves up/down in the topology.

    - maybe consider the time source parent identified d= uring the joining as temporary until the final time source parent is discov= ered. How the final one is discovered can through some command from the ME = (see Qin's attachement), or after receiving many DIOs.

     

    [Pascal] Yes, I read Xavi=92s prop= osal as a mechanism parallel to RPL to do like an hop-count-based OF0.

    Q: Do we really need to build the = time sync tree faster than the RPL graph?

     

    If no, maybe me could use the prio= rity as a boolean to mean that the node is already part of the RPL DAG and = may be used as time source.

    Initially only the root would be p= riority 0. All the others would be default 1.

    From there, all nodes that are one= hop away from root with good RSSI can sync with the root, and listen to DI= Os, and emit their own, and set their own priority to zero.

    Children sync to whichever prio 0 = neighbor as time source, listen to DIOs, select a parent, migrate to that p= arent as time source, and then can set their own priority to zero and send DIOs.

    Wou= ld that fly?

    Che= ers,

    Pas= cal

    &nb= sp;

    On Wed, Aug 21, 2013 at 1:15 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Agree!

     

    Qin

     <= /p>

    On Thu, Aug 22, 2013 at 3:23 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    HI Qin,

    as a basic setting we want the most basic approach. I guess that using (1) = first priority and then RSSi will avoid having loops. As you say all this a= pproaches would work but I bet for (1) to be the simplest.

    cheers!
    X

     <= /p>

    On Wed, Aug 21, 2013 at 12:20 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Xavi,

     

    It is a good idea to use Priority in EB as a factor = to choose initial time parent. But, I think there are several ways to use t= he Priority, and other metrics like RSSI. For example,

     

    (1) As you suggested, use Priority first, and then R= SSI

    (2) or use RSSI first, and then Priority

    (3) or use a function of Priority and RSSI.

     

    I'm not sure which is better. What do you think?<= /u>

     

    Qin

     

     <= /p>

    Hi all,

    I want to propose to add in the basic TSCH draft the fact that when a node = joins a network, it uses the EB join priority defined in the Slot and Link = IE (Section 5.2.4.13 15.4e std) to select its time parent. This priority is= 0 for the PAN coordinator of the network. A node listening several EB selects as a time parent the node wit= h lowest EB Join Priority. In case of receiving multiple EBs with the same = Join priority then filters by other metrics e.g RSSI of the link. (note tha= t until a DIO is received nodes don not know about the gradient).

    A node when sends an = EB uses the lowest EB Join priority it has heard and adds 1 to it as its ow= n Join priority.


    Current draft section states that RSSI or another metric should be used to = select the initial time parent, this has the problem that loops cannot be a= voided until the first DIO is received. With the proposed approach the prob= lem is solved and does not introduce anything new, just used what 15.4e provides to us.

    what is your opinion?

    thanks!
    Xavi

     

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    --_000_2C3A8CAFDCAFCA41B8BF705CD9471C5B1855A8D1xmbrcdx04ciscoc_-- From twatteyne@gmail.com Fri Aug 23 07:49:42 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B329811E81E1 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 07:49:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.269 X-Spam-Level: X-Spam-Status: No, score=-1.269 tagged_above=-999 required=5 tests=[AWL=-0.492, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_33=0.6, J_CHICKENPOX_44=0.6, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tkfOrj+UZ+-f for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 07:49:40 -0700 (PDT) Received: from mail-pd0-x231.google.com (mail-pd0-x231.google.com [IPv6:2607:f8b0:400e:c02::231]) by ietfa.amsl.com (Postfix) with ESMTP id 8F83811E82FA for <6tsch@ietf.org>; Fri, 23 Aug 2013 07:49:34 -0700 (PDT) Received: by mail-pd0-f177.google.com with SMTP id y10so762091pdj.8 for <6tsch@ietf.org>; Fri, 23 Aug 2013 07:49:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=kt/sz1WOrUUdfsKz3gkpZraCBeRFAnhjyJet1eqTqzs=; b=p1jnuCD/aRBlRaG0mtqSY5fQMUDb++fiU+iBOjgzJnStt38k0eUSWCPqojQRofdFrm 2qfEFvYq6VGMHqqb2RQurbL2XOjsLbIqV7Yp+018yPSX8yL1LaBU+M4jTpd81Oscix/s 1w1YR//dvdU6g1Ky8DxPDE6/GJDM8DyINwVYh4QfYhmc/FmDrmRdt44ziqITz4BV1o0c 1WSTeS06x+VruMAWAyG9TIKKcn482PBsVYsTvulZ/n54LnrdiIr8RBkNS3PDaA3FabR3 HlvoWMgcHYWw6iKP3C+DvKamgm+q1Z/H5VOb4l3My4tRWHfpTfZYbE18FJKyKtYf+GV5 K2/g== X-Received: by 10.66.12.193 with SMTP id a1mr21042290pac.80.1377269374329; Fri, 23 Aug 2013 07:49:34 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Fri, 23 Aug 2013 07:49:14 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Fri, 23 Aug 2013 07:49:14 -0700 X-Google-Sender-Auth: uUuf9yzELN02t9qjZCeY8af1UaE Message-ID: To: Qin Wang Content-Type: multipart/alternative; boundary=bcaec520e4f1d12cd304e49e8313 Cc: "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] data structure and format for management packets X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 14:49:42 -0000 --bcaec520e4f1d12cd304e49e8313 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Qin, Could we please bring this up when presenting your section during the call in 15min? Thanks, Thomas On Fri, Aug 23, 2013 at 6:10 AM, Qin Wang wrote: > Thomas, > > We can separate centralized case and distributed case to think about it. > > (1) centralized case: PCE will configure the report/alarm criteria and > provision tracks used for the node to send message to the ME in PCE in > advance, so, the ME in PCE should be well prepared when the node is sendi= ng > the 10pkts/s. > > (2) distributed case: the ME is in the upper layer of the same node, so > event-driven mechanism can be used. > > Make sense? > > Qin > > > > On Fri, Aug 23, 2013 at 7:19 AM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote: > >> Qin, >> >> I wasn't clear, sorry! What I mean is, if I'm a node in the network and >> suddently I feel like sending 10 pkts/s to a different node, how do I le= t >> the ME know to it can provision the slots? >> >> Thomas >> >> >> On Thu, Aug 22, 2013 at 12:00 PM, Pascal Thubert (pthubert) < >> pthubert@cisco.com> wrote: >> >>> Perfect sync : )**** >>> >>> ** ** >>> >>> The questions top down are which device talks to which devices and to >>> express what.**** >>> >>> Now it=92s good to have an idea of the formalism we expect to be using = to >>> make sure that it fits as we refine our work.**** >>> >>> Carsten will participate to the call tomorrow to present CBOR.**** >>> >>> ** ** >>> >>> Cheers,**** >>> >>> ** ** >>> >>> Pascal**** >>> >>> ** ** >>> >>> *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On >>> Behalf Of *Xavier Vilajosana Guillen >>> *Sent:* mardi 20 ao=FBt 2013 15:29 >>> *To:* Thomas Watteyne >>> *Cc:* 6tsch@ietf.org >>> *Subject:* Re: [6tsch] data structure and format for management packets= * >>> *** >>> >>> ** ** >>> >>> Hi, one cent more to what Thomas says.**** >>> >>> ** ** >>> >>> IMHO, the most important thing is the content and secondary is the >>> representation, at least at that time. So my feeling is that we need fi= rst >>> to identify the content, and later express it json,bson or any other >>> compressed format.**** >>> >>> ** ** >>> >>> One possible way to think on that is go in a two way approach, bottom u= p >>> and top down, i.e someone needs to describe what the PCE,etc .. need, >>> another can take the 6top commands and go up from there. From this two >>> specifications we will be able to identify what is missing and how to m= atch >>> things. **** >>> >>> ** ** >>> >>> just thoughts.**** >>> >>> X**** >>> >>> ** ** >>> >>> On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne < >>> watteyne@eecs.berkeley.edu> wrote:**** >>> >>> Qin,**** >>> >>> ** ** >>> >>> Thanks for starting the thread! I have comment which my sound a bit >>> vague, but it's on purpose :)**** >>> >>> ** ** >>> >>> Do you envision that the flows will match the 6tos commands exactly? >>> That is, are you considering that the packets sent between different >>> devices in the network (PCE, motes, etc) contain the same commands as t= he >>> 6top set of commands from >>> http://tools.ietf.org/html/draft-wang-6tsch-6top-00#section-2.4?**** >>> >>> ** ** >>> >>> Maybe we could by identifying the flows that we are considering, then >>> the contents of those packets (possibly described using some high level >>> representation such as JSON), and only then worry about their efficient >>> representation (e.g. BSON). Just a thought.**** >>> >>> ** ** >>> >>> Thomas**** >>> >>> ** ** >>> >>> On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang wrote:= * >>> *** >>> >>> Hi Kris,**** >>> >>> ** ** >>> >>> You are right. Security Key should be a structured data, besides the ke= y >>> material, it should includes something like lifetime, KeyID, .....Corre= ct? >>> **** >>> >>> ** ** >>> >>> Many thanks!**** >>> >>> ** ** >>> >>> Qin**** >>> >>> ** ** >>> >>> On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister wrote:= * >>> *** >>> >>> is the security key a string? That doesn't seem right. >>> >>> ksjp**** >>> >>> ** ** >>> >>> On 8/19/2013 2:05 PM, Qin Wang wrote:**** >>> >>> Hi all, **** >>> >>> ** ** >>> >>> I separate a thread from thread "Message Flows", to discuss the format >>> for management messages, e.g. JSON, BSON, or others.**** >>> >>> ** ** >>> >>> As Thomas's suggestion, before delving into the representation of the >>> information, we firstly identify what the contents of the different >>> signaling packets are, and in addition, what the data structures they m= ay >>> use. **** >>> >>> ** ** >>> >>> I would like to take the commands defined in draft-wang-6tsch-6top-00 a= s >>> starting point. Here are the parameters in those commands.**** >>> >>> ** ** >>> >>> //integer**** >>> >>> (1) xxxID, e.g. TrackID, SlotframeID**** >>> >>> (2) xxxOffset, e.g. SlotOffset**** >>> >>> (3) NumOfxxx/Length**** >>> >>> (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority **** >>> >>> (5) Status**** >>> >>> (6) ASN (5Byte integer), e.g. last time when a packet received from a >>> neighbor**** >>> >>> ** ** >>> >>> //string**** >>> >>> (7) L2 address**** >>> >>> (8) SecurityKey**** >>> >>> ** ** >>> >>> //bitmap**** >>> >>> (9) LinkOption**** >>> >>> ** ** >>> >>> //floating**** >>> >>> (10) Metrics, e.g. PDR, ETX, queuing statistics, energy-related metrics= * >>> *** >>> >>> ** ** >>> >>> Maybe something else........**** >>> >>> ** ** >>> >>> Now, we can evaluate different representation methods. What do you thin= k? >>> **** >>> >>> ** ** >>> >>> Thanks**** >>> >>> Qin**** >>> >>> ** ** >>> >>> ** ** >>> >>> **** >>> >>> ** ** >>> >>> _______________________________________________**** >>> >>> 6tsch mailing list**** >>> >>> 6tsch@ietf.org**** >>> >>> https://www.ietf.org/mailman/listinfo/6tsch**** >>> >>> ** ** >>> >>> ** ** >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch**** >>> >>> ** ** >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch**** >>> >>> ** ** >>> >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > --bcaec520e4f1d12cd304e49e8313 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Qin,
    Could we please bring this up when presenting you= r section during the call in 15min?
    Thanks,
    Thomas


    On Fri= , Aug 23, 2013 at 6:10 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Thomas,

    = We can separate centralized case and distributed case to think about it.

    (1) centralized case: PCE will configure the report/ala= rm criteria and provision tracks used for the node to send message to the M= E in PCE in advance, so, the ME in PCE should be well prepared when the nod= e is sending the 10pkts/s.=A0

    (2) distributed case: the ME is in the upper layer of t= he same node, so event-driven mechanism can be used.

    Make sense?
    Qin



    On Fri, Aug 23, 2013 at 7:19 AM, Thomas = Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    I wasn't clear, sorry! What I = mean is, if I'm a node in the network and suddently I feel like sending= 10 pkts/s to a different node, how do I let the ME know to it can provisio= n the slots?

    Thomas


    On Thu, Aug 22, 2013 at 12= :00 PM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrot= e:

    Perfect sync : )

    =A0<= /p>

    The questions top down ar= e which device talks to which devices and to express what.

    Now it=92s good to have a= n idea of the formalism we expect to be using to make sure that it fits as = we refine our work.

    Carsten will participate = to the call tomorrow to present CBOR.

    =A0<= /p>

    Cheers,

    =A0<= /p>

    Pascal

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: mardi 20 ao=FBt 2013 15:29
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] data structure and format for management packet= s

    =A0

    Hi, one cent more to what Thomas says.=

    =A0

    IMHO, the most important thing is the content and se= condary is the representation, at least at that time. So my feeling is that= we need first to identify the content, and later express it json,bson or a= ny other compressed format.

    =A0

    One possible way to think on that is go in a two way= approach, bottom up and top down, i.e someone needs to describe what the P= CE,etc .. need, another can take the 6top commands and go up from there. Fr= om this two specifications we will be able to identify what is missing and how to match things.=A0<= /u>

    =A0

    just thoughts.

    X

    =A0

    On Mon, Aug 19, 2013 at 11:07 PM, Thomas Watteyne &l= t;watteyne@= eecs.berkeley.edu> wrote:

    Qin,

    =A0

    Thanks for starting the thread! I have comment which= my sound a bit vague, but it's on purpose :)

    =A0

    Do you envision that the flows will match the 6tos c= ommands exactly? That is, are you considering that the packets sent between= different devices in the network (PCE, motes, etc) contain the same comman= ds as the 6top set of commands from=A0http://tools.ietf.= org/html/draft-wang-6tsch-6top-00#section-2.4?

    =A0

    Maybe we could by identifying the flows that we are = considering, then the contents of those packets (possibly described using s= ome high level representation such as JSON), and only then worry about thei= r efficient representation (e.g. BSON). Just a thought.

    =A0

    Thomas

    =A0

    On Mon, Aug 19, 2013 at 3:54 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi Kris,

    =A0

    You are right. Security Key should be a structured d= ata, besides the key material, it should includes something like lifetime, = KeyID, .....Correct?

    =A0

    Many thanks!

    =A0

    Qin

    =A0

    On Tue, Aug 20, 2013 at 5:14 AM, Kris Pister <ksjp@berkeley.edu&g= t; wrote:

    is the security key a string?=A0 That doesn't se= em right.

    ksjp

    =A0

    On 8/19/2013 2:05 PM, Qin Wang wrote:<= /p>

    Hi all,

    =A0

    I separate a thread from thread "Message Flows&= quot;, to discuss the format for management messages, e.g. JSON, BSON, or o= thers.

    =A0

    As Thomas's suggestion, before delvin= g into the representation of the information, we firstly identify what the = contents of the different signaling packets are, and in addition, what the data structures they may use.=A0

    =A0

    I would like to take the commands defined in=A0draft= -wang-6tsch-6top-00 as starting point. Here are the parameters in those com= mands.

    =A0

    //integer

    (1) xxxID, e.g. TrackID, SlotframeID

    (2) xxxOffset, e.g. SlotOffset

    (3) NumOfxxx/Length

    (4) xxxLevel, QoSLevel, SecuirtyLevel, Priority=A0

    (5) Status

    (6) ASN (5Byte integer), e.g. last time when a packe= t received from a neighbor

    =A0

    //string

    (7) L2 address

    (8) SecurityKey

    =A0

    //bitmap

    (9) LinkOption

    =A0

    //floating

    (10) Metrics, e.g. PDR, ETX, queuing statistics, ene= rgy-related metrics

    =A0

    Maybe something else........

    =A0

    Now, we can evaluate different representation method= s. What do you think?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0=A0

    =A0

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org=

    https://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch




    On Fri, Aug 16, 2013 at 5:52 AM, &l= t;P.Zand@utwente.nl<= /a>> wrote:

    Hi Raghuram, Qin,<= u>

    Let me enter to your disc= ussion

    I agree with Raghuram tha= t when the higher layer call the 6top=92s commands (or .requests primitives= ) it should be informed about the status of its request by =93command reply=94 or =93.confirm=94 primitives. The status of the =93.co= nfirm=94 or =93reply=94 can be success, failure or =85=

    Am I right?=

    I couldn=92t either find = the 6top=92s behavior upon receiving the =93MLME-SET-SLOTFRAME.confirm=94 o= r =93MLME-SET-LINK.confirm=94 primitives that might be called by L2. Did I miss that?

    =A0<= /p>

    Raghuram, I just have one= minor comment, in your example. I think that the RPL (L3) should use the = =93Create soft cell command=94 to ask a new cell without specifying the exact cell. Because the L3 does not have enough information to ask for= reserving specific cell in L2. The =93Create hard cell command=94 should b= e called by the one who has the global knowledge on network schedules, like= PCE. However, I agree that the PCE by calling the =93Create hard cell command=94 or RPL by calling =93Create = soft cell command=94 should be informed by 6top about the status of its req= uest. For example, It might happen that PCE send a same request twice or RP= L=92s request can=92t be serviced.

    AM I right?=

    =A0<= /p>

    Pouria.=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Raghuram Sudhaakar (rsudhaak)
    Sent: Thursday, August 15, 2013 9:07 PM
    To: Qin Wang
    Cc: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] Message flows

    =A0

    HI Qin,

    The conflicts I am referring to are -

    =A0

    Consdiering multihop communication and = hard-cells

    1. Route 1 requires a particular set of slots to be setup. Say no= de A must listen on slot number 11, 34, 65 and Tx on 13, 35, 68
    2. But another route 2 requires node A to listen on slot 35.=A0

    There may be other such conflicts that = we may need to resolve.

    =A0

    -raghuram

    =A0

    =A0

    Hi Raghuram,

    =A0

    I totally agree to your approach to def= ine the flow information to L3.

    =A0

    Regarding to your question, can you exp= lain more about:

    (1) from nodeA to nodeB is one hop or m= ulti-hop?

    (2) installing the route with hard cell= s or soft cells?

    (3) what "conflict during route in= stallation" mean? what kind of conflict?

    =A0

    Thanks

    Qin

    =A0

    =A0

    = =A0

    On Thu, Aug 15, 2013 at 10:16 PM, Raghu= ram Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Qin,

    I have pretty much the same line of tho= ught. I agree with the point that 6top is independent from L3. What we are = trying to do is define what L3 will need to implement to obtain information from 6top. Obviously, 6top will expose the= se interfaces in its standard implementation.

    =A0

    Do you think finding the common require= ments from 6top to L3 flows between RPL and PCE is a good place to start? I= am sure there are going to be some specific requirements for each but they can be added as PCE or RPL specific primiti= ves. I am not suggesting that we implement specific primitives for every L3= protocol, but once we cover RPL and PCE I think we will satisfy the requir= ements of most L3s.

    =A0

    The different flows you have identified= is perfect.=A0

    (1) The flows from 6top -> L2 have b= een addressed quite extensively in the draft already. There are a few flows= from L2 -> 6top that have to be addressed. GET_TIMING_PARENT for e..g.

    (2) I would consider the requirements o= f PCE, RPL, (probably v6ND) in terms of parameters required for route compu= tation to define the general requirements for flows between L3 and 6top. In the draft, you have already addressed some R= PL specific primitives like control message delivery. I think this should g= o in the RPL specific part. We define primitives to expose parameters requi= red by L3 to perform route computation in the general flows. For e.g. L2 neighbor list, link quality to each neig= hbor. We need to specify the message format that needs to used by L3 to obt= ain this info.

    (3) We will also need 6top->L3 flows= to be defined. For e.g., in the RPL case, =A0GET_RPL_PARENT will be= one such flow as 6top needs to provide the primitive GET_TIMING_PARENT in the L2->6top flow. A similar primitive need= s to be there for PCE.

    =A0

    (Note: when I say L2 -> 6top flow, I= mean L2 is the data requestor entity and 6top is the data provider. This i= s my own convention and hence the clarification)

    =A0

    Another critical part I want to get you= r opinions on is the following. We have decided that irrespective of L3 (PC= E or RPL) a node A will initiate route installation request when it has data to send to node B. In this case -

    1. How do resolve conflict during route installation? L3 computes= a route and send it over to 6top. Which in turn converts it to slot reserv= ations using the 6top -> L2 primitives in the slot frame. What if there is a conflict during this slot reservation? What are the mes= sages that will inform L3 and the node that route installation failed? This= must also cause L3 to recompute its route.
    2. Then we have to ask, does 6top provide a mechanism to inform L= 3 about failure and obtain a recomputed route (i.e.) perform n number of re= tries. Or just fail after one try and leave it to the node to reinitiate a route request.

    -raghuram

    =A0

    =A0

    From: Qin Wang <qinwang@berkeley.edu>
    Date: Thursday, August 15, 2013 6:00 AM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkeley.edu<= /a>>
    Subject: Re: Message flows

    =A0

    Hi Raghuram,

    =A0

    Sorry for the late response. It is welc= ome for you to add flow information if necessary.

    =A0

    Just one thing I want to understand mor= e clearly. I think 6top is a relatively independent sublayer from upper lay= er. RPL is used as upper layer in the first step, but, just one kind of upper layers in the future. Correct?=A0=

    =A0

    In this sense, we should separate the g= eneral flow information to upper layer and the specific flow information to= RPL. Then, can we organize the flow information related to 6top in this way?

    =A0

    (1) flow information with L2, i.e. TSCH=

    (2) general flow information with upper= layer, may be L3 or L2.5

    (3) flow information with specific uppe= r layer protocol like RPL.

    =A0

    What do you think?=

    =A0

    Qin=A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    =A0

    = =A0

    On Thu, Aug 15, 2013 at 6:10 AM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Ok.=A0

    =A0

    Qin, if you are OK I can add the flow i= nformation specific to RPL.=A0

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: "xvilajosana@eecs.berkeley.edu" <xvilajosana@eecs.berkele= y.edu>
    Date: Wednesday, August 14, 2013 2:32 PM
    To: raghuram sudhaakar <rsudhaak@cisco.com>
    Cc: Qin Wang <qinwang@berkeley.edu>
    Subject: Re: Message flows

    =A0

    Hi Raghu= ram,

    I let Qin answer as she is the main aut= hor. My opinion is that by now we keep the document as a single file but we= separate the two message flows. IMHO, if you have information to add it is more than welcome!

    X

    = =A0

    On Wed, Aug 14, 2013 at 1:42 PM, Raghur= am Sudhaakar (rsudhaak) <rsudhaak@cisco.com> wrote:

    Xavi, Qin,

    I believe that there is some informatio= n that needs to be added to the message flows that will occur between L3 -&= gt; 6top and L2 -> 6top, in addition to what is already there in Qin's draft. I wanted to check with you guys if you w= ant to add to the same document or split it into a separate RFC. When I say= split into separate RFC, =A0what I mean is, L3 to 6top is one RFC and L2 t= o 6top is another. The current draft has a lot of information about L2 to 6top. I could add more about the RPL to 6= top is its OK..

    =A0<= /p>

    -raghuram

    =A0

    =A0

    =A0



    Minutes Webex 23 August 2013, 6TSCH group

    Note: timestamps in PDT.

    Taking notes=A0(using Etherpad)

    1. Xavi Vilajo= sana
    2. Dominique Ba= rthel
    3. Th= omas Watteyne

    Present=A0(alphabetically)

    1. Carsten Bormann<= /li>
    2. Diego Dujovn= e
    3. Domini= que Barthel
    4. Elvis Vogli
    5. Kuor Hsin Chang
    6. Maria Rita Palattella
    7. Pascal Thubert
    8. Pouria Zand
    9. Qin Wang
    10. Raghuram Sudhaakar
    11. Thomas Watteyne
    12. Tom Phinney
    13. Xavi Vilajosana

    Recording

    Slides

    Agenda

    • Administrivi= a=A0[2min]
    • CBOR=A0[10min]
    • Identifying the flows=A0[10min]
    • Update "Basic" Draft=A0[10mi= n]
    • = Time parent selection and EB priority=A0[20min]
    • renaming 6TS= CH=A0[5min]
    • This Coming Week=A0[2min]
    • AOB=A0[1min]

    Minutes

    • [08.02]<= /em>=A0Meeting starts
    • [08.02]=A0Administrivia
      • Carsten is j= oining us to give an overview of CBOR. Thanks!
      • Overview of the agenda
      • Approval of the BoF Minutes

        No issues raised. Action item: Thomas to send final call for approval on ML= . Action item: Thomas to upload final minutes onto meeting materials websit= e.

      • Approval minutes webex 08/09

        No issues raised. Minutes approved.

      • Slides during the call can be = accessed on Bitbucket before the call, or by flipping through slides shared= in webex.
      • IETF 88 Vanc= ouver:
        • Registration opens today
        • Don't wait too long to book hotel
        • IETF 88 is in 71 days
    • [08.08]= =A0CBOR=A0[Carsten Bormann]
      • CBOR: Concis= e Binary Object Representation - Design and Overview.
      • Available at=A0http://tools.ietf.org/html/draft-= bormann-cbor-06
      • Why a new bi= nary format? --> different design, not all formats are useful for all pr= otocols:
        • Simple format, can be implemented in small amount of code
        • Encoded data is compact
        • No compre= ssion or even fiddling. Not as compact as using compression, but the amount= of code used to produce the format is very small.
      • JS= ON-like format.
        • no schema required. -- sch= ema-less
        • compact impl= ementation
        • applicable to constrained nodes and high volume applications
        • supports all JSON data types.
        • extensible.
      • What does it look like?
        • Initial byte= :
          • major type (3bits) and additional inform= ation (5bytes)
          • 8 major type= s: bool, int, etc.
      • CBOR vs FOO (e.g. Binary JSON)
      • Qu= estions
        • [Pascal]=A0Usage = of CBOR? Are there any standards already using it?
        • [Car= sten]=A0Several standard are looking for applicability. Early stag= e though
        • [Thomas]=A0Can CBOR encode all JSON type? I.e. can we desi= gn using JSON, knowing tha CBOR could encode it?
        • [Car= sten]=A0Yes. Do not talk about compression, rather encoding.
          • <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word">[Thom= as]=A0Is there a aeb based application which can be used to test e= ncoding of different JSON strings for initial testing?
        • [Car= sten]=A0People have implemented it in an afternoon. I have a robus= t implementation I can push out if needed.
        • [Thomas]=A0Status?
        • [Carsten]=A0In final steps. At= the IESG now.
    • [08.22]=A0Identifying the flows=A0[Pouria Zand, Qin Wang]<= /strong>
      • Discussion about identifying the = flows:
        • Centralized = vs distributed system manager architecture concept
        • "ME" is the management= entity. Can be an upper layer (distributed scheduling) or a PCE (centraliz= ed scheduling).
        • 3 control fl= ows:
          • ME <-> 6top: ME can be in PCE o= r in upper layer
          • 6top <-&g= t; TSCH
          • = 6top <-> 6top: message flows between 6top of node A and 6top of node = B
        • Co= ntrol flows:
          • action flows: Action request = - confirmation..
          • query flows:=
          • Report = flows:
        • example of interaction between node A and B to schedule a soft cell between= them, at the initiative of node A's higher layer.
        • example of interaction for c= reating a hard cell:
          • Create a lin= k between 2 nodes managed by the PCE.
          • safer to have PCE send two separate request t= o A and B to create a hard cell (as opposed to having A pass on the request= to B)
          • [Pas= cal]=A0in the future (after rechartering), we could have a train o= f requests in RSVP-like fashion.
          • [Thomas]=A0we have to make sure the format agreed upon now= can be reused in the future.
          • [Maria Rita]=A0The PCE should know t= hat a link between A and B exists when it instructs to allocate a cell from= A to B.
          • [Qin= ]=A0three message interfaces: ME-6top, 6top-TSCH, 6top-6top, this = work focus on ME-6top first.
          • [Thomas]=A0Let's come up with an actual description of= the contents of the packet, and come again to this question in the future.=
        • How to figure out the Contents of the Control Flow:
          • Select what format and content is necessary.
          • Bottom up approach: from 6top to upper layers
          • Top down approach: from ME to 6top
        • Bottom up investigation:
          • Content of Action= Flow (see slides)
          • Content Query Flow:
            • not define, needs to = work from top down approach.
          • [Qin]=A0It is unclear at this stage which slots to use to = transport the report flow.
          • [Thomas]=A0In the context of the basic = draft, this question is already answered.
          • [Pas= cal]=A0Add more information about tracks? More commands specific f= or managing tracks?
          • [Thomas]=A0Installing a mapping between cells and tracks u= sed to be part of the list of type?
          • [Qin]=A0List on slides are tru= ncated

            Action item: Qin t= o send the document with full list to the ML.

          • [Thomas]=A0When a mote wants to send more data, it has to contact the ME and r= equest more links. Is that mapped in that commands?
          • [Qin= ]=A0Centralized case: The PCE configures the motes on how to repor= t alarms. The PCE can configure the track that should be used to request mo= re bandwidth.
          • [Tho= mas]=A0How does a mote let the PCE know that it is going to send d= ata to a new destination which is not in an existing track?
          • [Qin]=A0We need to define how a request for a new track or= more bandwidth flows to the PCE.
          • [Qin]=A0Application needs to tal= k to ME.

            Action Item: Take = this discussion in the ML.

        • Top down investigation:
          • RPL rank is = needed, rank should be an attribute of the neighbour table.
          • Need input from someo= ne familiar with PCE.
          • [Tho= mas]=A0Does this impact the format of the packets?
          • [Qin]=A0We need to know the message requirements from the PCE.
          • [Pas= cal]=A0RPL and PCE can install routes. The management entity has r= equirements that we need to identify, the top down approach has to show tha= t. The flows of information in the forwarding plane.

            Action Item: Qin r= equest people to join her discussion and define what the information is nee= ded form a top down approach point.

    • [08.50]=A0Update "Basic" Draft=A0[Xavi Vilajosana]=
      • Build gradient on join priorities, by adversing +1 on best join priority he= ard.
      • TO = be used before we have a RPL DODAG in place.
      • Proposes to use the "zero" RPL Objective Function.
      • One preferred parent = and one alternate.
      • Non-storing mode as a MUST implement.
      • Explains rank computation as defined in "= ;zero" OF.
      • Use of ETX metric to compute rank increase.
      • [Pascal]=A0normalized = to predefined limits. 1 to 9. For example, assume ETX of a fairly good radi= o link being 1.2, the rank increment can be set to 0.4 such that this ETX i= s represented by 3.
    • [09.02]=A0Time parent selection and EB priority > We are running = out of time. This discussed is moved to next week.
    • [09.02]=A0Renaming 6TSCH
      • Thomas a= nnounces current ranking of votes on the mailing list.
      • Will publish on the mailing list.
      • Of the proposed new names, none raised concerned = with IESG.
    • [09.04]=A0This Coming Week
      • ETX im= plementation according to RFC6551 and RFC6552
        • Private disc= ussion, OpenWSN implementation
        • Lead: Xavi Vilajosana
      • Synchronization and Clock accuracy
        • See ML = thread: =93RPL on Basic=94
        • Lead: Pouria Zand
      • Fast join
          =
        • See ML threa= d: =93Synchronization Issues=94
        • Lead: Alfred= o Grieco
      • JSON, BSON, CBOR comparison
        • Private disc= ussion
        • L= ead: Qin Wang
      • Take a stab at packet format
          <= li style=3D"margin:10px 0px;padding:0px;word-wrap:break-word">Lead: ?<= /ul>
        • Dis= cussion Time parent selection and EB priority
          • Lead: ?
            • =
      • [09.07]=A0AOB

        No other business = from the attendance.

      • [09.08]=A0Meeting ends
    --047d7b2e0d833c117d04e4a04478-- From ribes170289@gmail.com Fri Aug 23 10:06:19 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 663A411E8307 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 10:06:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UjCw-S3gnhh4 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 10:06:19 -0700 (PDT) Received: from mail-wi0-x233.google.com (mail-wi0-x233.google.com [IPv6:2a00:1450:400c:c05::233]) by ietfa.amsl.com (Postfix) with ESMTP id BED8011E8302 for <6tsch@ietf.org>; Fri, 23 Aug 2013 10:06:18 -0700 (PDT) Received: by mail-wi0-f179.google.com with SMTP id hr7so827495wib.0 for <6tsch@ietf.org>; Fri, 23 Aug 2013 10:06:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; bh=IKop0pM4U8VBcLQ5ORYkZsBFvoS+57Le7k2XK0fyKHg=; b=ptYa7JdCm1Ydds99xBgFrnxOIBKNtIcXSTkwBjJWvxmIS4mOLtsk9itJJ3TWOooA/T /v7tDkjPuXx4XzqQorx+zdJ4mjmJa1dAjiuEUU+vUZffWwn/YUhaWfLyqOqGV30opv54 oH3gatmmW3t0BRS0VX6apqUheGhOC0JADycjUKwiVeWWXja8cGdH+o4ywzz4oP8HZ1Lc i3iubcNDbZg2D+VhSANURY3pFk3633nf6re4uCJXxau626OZFyrZeBXyJFcmlbQdp1Te HO2ikKu85Vp0H3afDodNMV/32i3qtubZmaDjKyKq+4rh9fgpUpyOBW5v1DyE8hjhaplN u0UA== X-Received: by 10.194.235.138 with SMTP id um10mr542029wjc.30.1377277577930; Fri, 23 Aug 2013 10:06:17 -0700 (PDT) Received: from ribeshost.ribesdomain (adsl-ull-14-80.46-151.net24.it. [151.46.80.14]) by mx.google.com with ESMTPSA id fu13sm1152862wic.7.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 23 Aug 2013 10:06:16 -0700 (PDT) Message-ID: <52179685.3010703@gmail.com> Date: Fri, 23 Aug 2013 19:06:13 +0200 From: Giuseppe User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8 MIME-Version: 1.0 To: Kris Pister References: <5215eb9f.e2c6b40a.6b2c.ffffe7e1@mx.google.com> <5216A2A1.3080602@berkeley.edu> <5216B1F4.8090504@gmail.com> <52178470.50309@berkeley.edu> In-Reply-To: <52178470.50309@berkeley.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: '6TSCH' <6tsch@ietf.org>, Alfredo Grieco , 'Elvis Vogli' , 'Gennaro Boggia' Subject: Re: [6tsch] Synchronization Issues X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 17:06:19 -0000 Il 23/08/2013 17:49, Kris Pister ha scritto: > +1 (assuming you meant slot_num not superframe_num) > > ksjp > > On 8/22/2013 5:51 PM, Giuseppe wrote: >> while scheduling beacons with the couple (superframe_num, >> channel_num) should avoid the collisions in this case and improve the >> synchronization phase > yes, I've assumed advertisement is sent once for superframe. Cheers -- Giuseppe From qinwang@berkeley.edu Fri Aug 23 10:36:27 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6377711E8209 for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 10:36:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.904 X-Spam-Level: X-Spam-Status: No, score=-2.904 tagged_above=-999 required=5 tests=[AWL=0.072, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id x4BPkOKaP1cC for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 10:36:16 -0700 (PDT) Received: from mail-vc0-f170.google.com (mail-vc0-f170.google.com [209.85.220.170]) by ietfa.amsl.com (Postfix) with ESMTP id 902B411E81FE for <6tsch@ietf.org>; Fri, 23 Aug 2013 10:36:15 -0700 (PDT) Received: by mail-vc0-f170.google.com with SMTP id kw10so651937vcb.29 for <6tsch@ietf.org>; Fri, 23 Aug 2013 10:36:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=XV/8hQd7IyNKuEffBihq3nAzIs0OWi3B/h+H8cgeOFU=; b=S9s/cn/xJUsN2Z7FKU6UQg37Jng15Sk4AgQ8RVk9GLXnIu2ZEpbtRcMFUb92jfQts0 lllK4ij6FTPrbRhR5pbEsAJpejvEvAZMWkv3+ldSeAJWURGWwKmJ23jOi4VBKzTbd2U5 Nvys2+8bB7ymg1KDwQHL+XS81f8eWSKl5RXZp6iHOHvGNGXXKMru+UL+AW6zfklI9+Iz ZmLfuxfWWwr5zXfcYEwoEzTipmVygJ4w4QUTBCHN4Ch/T7WjFK5l4uvaeCD48zJdYm8A UzwF9lJMN/f4OHTKNiRZCczzYBxBaMo4H6pdgnvraktMRVl44UqDRzekxIr9RkVhAPHM bCUw== X-Gm-Message-State: ALoCoQlMVpjwH3JfD9Fd9A7Ju5HBPAM/64kS+CpeKirKGkjFm9Mu7LYKFl+rXiBB7n/9PHKjDBHC MIME-Version: 1.0 X-Received: by 10.220.186.202 with SMTP id ct10mr503668vcb.14.1377279373951; Fri, 23 Aug 2013 10:36:13 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Fri, 23 Aug 2013 10:36:13 -0700 (PDT) Date: Sat, 24 Aug 2013 01:36:13 +0800 Message-ID: From: Qin Wang To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b676fd0d75c4504e4a0d745 Subject: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 17:36:27 -0000 --047d7b676fd0d75c4504e4a0d745 Content-Type: text/plain; charset=ISO-8859-1 Hi all, During today's call, we presented three control flows between Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Report Flow, and started to talk about the 4th control flow. The thread will continue the discussion about 4th flow. Here is the scenario: when a node finds that more cells are needed, e.g. nodes wants to send 10pkt/s report at some time, it should be able to ask ME to install more bandwidth. I can see two approaches: (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRate is a attribute in 6top. Then, ME can get the information via Query Flow or Report Flow, and adjust the bandwidth of the node via Action Flow. (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth Request to ME, and then ME install more bandwidth. This is the 4th control flow. What do you think? Which one makes more sense? Qin --047d7b676fd0d75c4504e4a0d745 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi all,

    During today's call, we pre= sented three control flows between Management Entity (ME) and 6top, i.e. Ac= tion Flow, Query Flow, and Report Flow, and started to talk about the 4th c= ontrol flow. The thread will continue the discussion about 4th flow.

    Here is the scenario: when a node finds that more cells= are needed, e.g. nodes wants to send 10pkt/s report at some time, it shoul= d be able to ask ME to install more bandwidth.=A0

    I can see two approaches:
    (1) Managed by ME, without 4th Control = Flow. Assume BandwidthUsageRate is a attribute in 6top. Then, ME can get th= e information via Query Flow or Report Flow, and adjust the bandwidth of th= e node via Action Flow.=A0
    (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth= Request to ME, and then ME install more bandwidth. This is the 4th control= flow.

    What do you think? Which one makes more= sense?

    Qin


    --047d7b676fd0d75c4504e4a0d745-- From xvilajosana@berkeley.edu Fri Aug 23 10:47:47 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E2B4D21F9A6D for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 10:47:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.136 X-Spam-Level: X-Spam-Status: No, score=-2.136 tagged_above=-999 required=5 tests=[AWL=-0.160, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WkUY5wRk1Amr for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 10:47:43 -0700 (PDT) Received: from mail-pd0-f182.google.com (mail-pd0-f182.google.com [209.85.192.182]) by ietfa.amsl.com (Postfix) with ESMTP id BA7AD21F9A70 for <6tsch@ietf.org>; Fri, 23 Aug 2013 10:47:43 -0700 (PDT) Received: by mail-pd0-f182.google.com with SMTP id r10so952188pdi.13 for <6tsch@ietf.org>; Fri, 23 Aug 2013 10:47:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=SN5796XOLmgVyOptR17UtT/uRtXMfFWSQfs5qMOosuk=; b=pfgLXJJCLotJpaH5P0vQOUdmT08veacZvDKBtl5QvMHroA4WHInRduaz2SLQbCmlAL sQKJakf22Y9X5QLxB4qsBXI6jB/Cl0MWGWUgWyeMDv0at0TtoK0pCvhwLzaED7dMpnsH EHnxb2KXwUz5TODpZzaWSgKeOat6Fo9kttSn0NAAo0SvpEvtLx3HavqmuWXQVdMvCfFb Mpao6wEX+/5FYsXjDZiPLUZsdlytRjpJZhMukKKkoKHsSwXFPC5L2ccqjKXwTINbNn2j QO4LEu9zrqz5zecHwI3ZiDKnibpjbQ05mmEzIyjx4ktyNo/+k372aepcPdNy/frDXHC2 CXyw== X-Gm-Message-State: ALoCoQn3ECrcTSeGnh2e2MghmSgbLiOnoC9PT0O5rOSdTH7MAia65QaX+4w48a0a+lLZbyWzCrAW MIME-Version: 1.0 X-Received: by 10.68.239.42 with SMTP id vp10mr809559pbc.164.1377280063463; Fri, 23 Aug 2013 10:47:43 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Fri, 23 Aug 2013 10:47:43 -0700 (PDT) In-Reply-To: References: Date: Fri, 23 Aug 2013 10:47:43 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=047d7b33d912f06cca04e4a10083 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 17:47:48 -0000 --047d7b33d912f06cca04e4a10083 Content-Type: text/plain; charset=ISO-8859-1 Hi Qin, I like your (2). Note also that there are situations that might have some differences. 1-the track already exists. 2-the track between the two entities does not exists in either case I think that the node that requires certain BW to another node should talk to 6top, which processes that request and sends a request to the ME, the ME installs that new track. does it make sense. Do you see any drawback on that approach? X On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang wrote: > Hi all, > > During today's call, we presented three control flows between Management > Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Report Flow, and > started to talk about the 4th control flow. The thread will continue the > discussion about 4th flow. > > Here is the scenario: when a node finds that more cells are needed, e.g. > nodes wants to send 10pkt/s report at some time, it should be able to ask > ME to install more bandwidth. > > I can see two approaches: > (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRate is > a attribute in 6top. Then, ME can get the information via Query Flow or > Report Flow, and adjust the bandwidth of the node via Action Flow. > (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth Request > to ME, and then ME install more bandwidth. This is the 4th control flow. > > What do you think? Which one makes more sense? > > Qin > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b33d912f06cca04e4a10083 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Qin, I like your (2).
    =A0
    <= /div>
    Note also that there are situations that might have some differen= ces.

    1-the track already exists.
    2-the trac= k between the two entities does not exists

    in either case I think that the node that requires certain BW to = another node should talk to 6top, which processes that request and sends a = request to the ME, the ME installs that new track.

    does it mak= e sense. Do you see any drawback on that approach?

    X


    On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu= > wrote:
    Hi all,

    = During today's call, we presented three control flows between Managemen= t Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Report Flow, and = started to talk about the 4th control flow. The thread will continue the di= scussion about 4th flow.

    Here is the scenario: when a node finds that more cells= are needed, e.g. nodes wants to send 10pkt/s report at some time, it shoul= d be able to ask ME to install more bandwidth.=A0

    I can see two approaches:
    (1) Managed by ME, without 4th Control = Flow. Assume BandwidthUsageRate is a attribute in 6top. Then, ME can get th= e information via Query Flow or Report Flow, and adjust the bandwidth of th= e node via Action Flow.=A0
    (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth= Request to ME, and then ME install more bandwidth. This is the 4th control= flow.

    What do you think? Which one makes more= sense?

    Qin
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b33d912f06cca04e4a10083-- From qinwang@berkeley.edu Fri Aug 23 11:00:09 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6317E11E81CE for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 11:00:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.907 X-Spam-Level: X-Spam-Status: No, score=-2.907 tagged_above=-999 required=5 tests=[AWL=0.069, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qnd4hGJvbDmT for <6tsch@ietfa.amsl.com>; Fri, 23 Aug 2013 11:00:05 -0700 (PDT) Received: from mail-ve0-f177.google.com (mail-ve0-f177.google.com [209.85.128.177]) by ietfa.amsl.com (Postfix) with ESMTP id 1047B11E80C5 for <6tsch@ietf.org>; Fri, 23 Aug 2013 11:00:04 -0700 (PDT) Received: by mail-ve0-f177.google.com with SMTP id cz11so660606veb.36 for <6tsch@ietf.org>; Fri, 23 Aug 2013 11:00:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=0NyofyziJSV/vt7RGFh8735Pr5dtiKGsr79P9RfMUPs=; b=EofJWMy3nEWF4+4FqZhmd4iGW6o5+EAXgC00PcLsaNjy6bqkxE8GXTQSNExSvwZ5Hr 9y/wIi2PB0PVPsEYKJhwSMvdNyWvDX064Tn+0kpejm4HTsPpIqP5ga42MZdDAE5j4cLN bpxNTzHkIE2lKSKc/5Qsh+jP0lJvu+mbwyMdkGH+RxuANsPQfDGwVJFyj1K4bX88vgHc Fnau3F2KsKNCo5/hsX0PPywxH0AGF8XYofoZcjYU/OIF/+po21m+j+zFkPe4Neaup1TR lN+JLl1ipEjoARPEp1LZd2hHWqtCpor56DJ1KXqC06+Zj1SGMPz/wd8FKDmVuj9XFw7d I60A== X-Gm-Message-State: ALoCoQlzB4SCqCXfnOsrNImcIEEUQby3intBbHk3sQ87PdXJ0KdnvFpfJ77H7AtwWULmb/Dm3aUB MIME-Version: 1.0 X-Received: by 10.58.146.71 with SMTP id ta7mr568727veb.23.1377280804498; Fri, 23 Aug 2013 11:00:04 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Fri, 23 Aug 2013 11:00:04 -0700 (PDT) In-Reply-To: References: Date: Sat, 24 Aug 2013 02:00:04 +0800 Message-ID: From: Qin Wang To: Xavier Vilajosana Guillen Content-Type: multipart/alternative; boundary=047d7b5d4a301bbe9b04e4a12db1 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Aug 2013 18:00:09 -0000 --047d7b5d4a301bbe9b04e4a12db1 Content-Type: text/plain; charset=ISO-8859-1 Xavi, Approach-(2) is more flexible and likely covers more situations. But, it may bring some complexity to 6top, because 6top has to make decision on the bandwidth request (add/delete), which needs some metrics, some intelligence. What do you think? Qin On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi Qin, I like your (2). > > Note also that there are situations that might have some differences. > > 1-the track already exists. > 2-the track between the two entities does not exists > > in either case I think that the node that requires certain BW to another > node should talk to 6top, which processes that request and sends a request > to the ME, the ME installs that new track. > > does it make sense. Do you see any drawback on that approach? > > X > > > On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang wrote: > >> Hi all, >> >> During today's call, we presented three control flows between Management >> Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Report Flow, and >> started to talk about the 4th control flow. The thread will continue the >> discussion about 4th flow. >> >> Here is the scenario: when a node finds that more cells are needed, e.g. >> nodes wants to send 10pkt/s report at some time, it should be able to ask >> ME to install more bandwidth. >> >> I can see two approaches: >> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRate is >> a attribute in 6top. Then, ME can get the information via Query Flow or >> Report Flow, and adjust the bandwidth of the node via Action Flow. >> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth Request >> to ME, and then ME install more bandwidth. This is the 4th control flow. >> >> What do you think? Which one makes more sense? >> >> Qin >> >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > --047d7b5d4a301bbe9b04e4a12db1 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Xavi,

    Approach-(2) is more flexible and= likely covers more situations. But, it may bring some complexity to 6top, = because 6top has to make decision on the bandwidth request (add/delete), wh= ich needs some metrics, some intelligence.=A0

    What do you think?

    Qin



    On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Qin, I li= ke your (2).
    =A0
    Note also that there are situation= s that might have some differences.

    1-the track already exists.
    2-the track betwee= n the two entities does not exists

    in either case I think that the node that requires certain BW to = another node should talk to 6top, which processes that request and sends a = request to the ME, the ME installs that new track.

    does it mak= e sense. Do you see any drawback on that approach?

    X


    On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <q= inwang@berkeley.edu> wrote:
    Hi all,

    During today's call, we presented t= hree control flows between Management Entity (ME) and 6top, i.e. Action Flo= w, Query Flow, and Report Flow, and started to talk about the 4th control f= low. The thread will continue the discussion about 4th flow.

    Here is the scenario: when a node finds that more cells= are needed, e.g. nodes wants to send 10pkt/s report at some time, it shoul= d be able to ask ME to install more bandwidth.=A0

    I can see two approaches:
    (1) Managed by ME, without 4th Control = Flow. Assume BandwidthUsageRate is a attribute in 6top. Then, ME can get th= e information via Query Flow or Report Flow, and adjust the bandwidth of th= e node via Action Flow.=A0
    (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth= Request to ME, and then ME install more bandwidth. This is the 4th control= flow.

    What do you think? Which one makes more= sense?

    Qin
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    --047d7b5d4a301bbe9b04e4a12db1-- From pthubert@cisco.com Mon Aug 26 08:17:23 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 57DD021E8088 for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 08:17:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.539 X-Spam-Level: X-Spam-Status: No, score=-10.539 tagged_above=-999 required=5 tests=[AWL=0.060, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PtkJ5AdJmo7r for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 08:17:16 -0700 (PDT) Received: from rcdn-iport-3.cisco.com (rcdn-iport-3.cisco.com [173.37.86.74]) by ietfa.amsl.com (Postfix) with ESMTP id 925E821E8093 for <6tsch@ietf.org>; Mon, 26 Aug 2013 08:17:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=632; q=dns/txt; s=iport; t=1377530235; x=1378739835; h=from:to:subject:date:message-id: content-transfer-encoding:mime-version; bh=jObyo5gbsvvMffFFzOPE19M5SxxO2XxTuMuZ0gPSxOI=; b=geafpZqM/7wSc6UfmFQLira+oxv5D8BKo2llIHQY7+wBUJ5Ep3go0KXp sGnZtFK6w2ARgiD3/B1dlrilaiPbvvpfAtKCZUAAwH2S3UxJ8yviG3rZ/ xLQrakAx1/ILkrDLDfjcLEPkZ0Ix26neT0qx8CvMqLxFNpsIDTI4l8dWf I=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Aq0GAEZxG1KtJV2Z/2dsb2JhbABagweBBsAVgSIWbQeCJgEEOlEBKhRCJgEEG4d5lkGhIIJajGaBB4NUfQOpT4Megio X-IronPort-AV: E=Sophos;i="4.89,959,1367971200"; d="scan'208";a="251730109" Received: from rcdn-core-2.cisco.com ([173.37.93.153]) by rcdn-iport-3.cisco.com with ESMTP; 26 Aug 2013 15:16:55 +0000 Received: from xhc-rcd-x09.cisco.com (xhc-rcd-x09.cisco.com [173.37.183.83]) by rcdn-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id r7QFGtsU028361 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for <6tsch@ietf.org>; Mon, 26 Aug 2013 15:16:55 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-rcd-x09.cisco.com ([173.37.183.83]) with mapi id 14.02.0318.004; Mon, 26 Aug 2013 10:16:55 -0500 From: "Pascal Thubert (pthubert)" To: "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: 6TiSCH or not 6TiSCH ? Thread-Index: Ac6ibwlh8LHk3ndPTEO2PUrHzyUm9A== Date: Mon, 26 Aug 2013 15:16:55 +0000 Deferred-Delivery: Mon, 26 Aug 2013 15:16:00 +0000 Message-ID: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.49.80.24] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: [6tsch] 6TiSCH or not 6TiSCH ? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Aug 2013 15:17:23 -0000 Dear all; 6TiSCH is the winner of the Condorcet vote.=20 There was a good point on the ML that we might extend our work in the futur= e to other MACs that are still deterministic (based on TDM) but not necessa= rily channel hopping. I wanted to take a very quick poll on the alternate name 6LoTuS that indica= tes the family trait with other low power activities ( the lo prefix) and f= ocusses on the Time Slotted aspect. If you really like the 6LoTuS name better (than 6TiSCH) please let us know = in the coming days. We really want to make the request by the end of this = week. Cheers, Pascal and Thomas From diego.dujovne@mail.udp.cl Mon Aug 26 12:31:23 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AC77311E81FD for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 12:31:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id s9Rq9DveCSuF for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 12:31:18 -0700 (PDT) Received: from mail-wi0-f177.google.com (mail-wi0-f177.google.com [209.85.212.177]) by ietfa.amsl.com (Postfix) with ESMTP id 5E39311E81FB for <6tsch@ietf.org>; Mon, 26 Aug 2013 12:31:17 -0700 (PDT) Received: by mail-wi0-f177.google.com with SMTP id cb5so2119771wib.16 for <6tsch@ietf.org>; Mon, 26 Aug 2013 12:31:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=okH0TG6tulYk2uQFo6end24++1RXcCS0smxG+/wnI+U=; b=POf16raQaedpo0koBmhGr4Ocuwh98zmWGtbaDbJpLvhHTJKhq/Bm97onuB2/S5BIFz QtZBupw9ZqKJR+HO5spwlwTUJnlMQ9sRJJWK21jCGE96bqiO6HdnsWiCKojwlmKn8Uky 7wATNUOzfc5b5yElDOe227yO2KvJwCWoDvsJvDc04HJt5e3WKO85GX4ie8SpVerR52nq 0NuHmitLB8Hk8vhv7kKivmZFFqFIDIcHGnlc8gnnL6mPyUxwc3gwe2lDOvEKEmUWICx4 sVHAUwjQqtdFh/mz86FLnoVDechyeq99UIkdMolLX6bmVHoQ6NhGuLPbCoW9k5tU13mP d7cA== X-Gm-Message-State: ALoCoQlICRN5dI0NDbKeloOBriIlagJMD4JydPdnrtmO+n/H42NfhSVR/p8sxf5GH9CnZH5UYGoH MIME-Version: 1.0 X-Received: by 10.194.24.168 with SMTP id v8mr11305843wjf.28.1377545477010; Mon, 26 Aug 2013 12:31:17 -0700 (PDT) Received: by 10.194.122.103 with HTTP; Mon, 26 Aug 2013 12:31:16 -0700 (PDT) In-Reply-To: References: Date: Mon, 26 Aug 2013 15:31:16 -0400 Message-ID: From: "Prof. Diego Dujovne" To: "Pascal Thubert (pthubert)" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Aug 2013 19:31:23 -0000 Pascal, I agree with the 6LoTuS to include other TDMAs as long as the IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay on top of the MAC layer. Regards, Diego Dujovne 2013/8/26 Pascal Thubert (pthubert) : > Dear all; > > 6TiSCH is the winner of the Condorcet vote. > > There was a good point on the ML that we might extend our work in the fut= ure to other MACs that are still deterministic (based on TDM) but not neces= sarily channel hopping. > I wanted to take a very quick poll on the alternate name 6LoTuS that indi= cates the family trait with other low power activities ( the lo prefix) and= focusses on the Time Slotted aspect. > > If you really like the 6LoTuS name better (than 6TiSCH) please let us kno= w in the coming days. We really want to make the request by the end of thi= s week. > > Cheers, > > Pascal and Thomas > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch --=20 DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 From xvilajosana@berkeley.edu Mon Aug 26 15:02:25 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F28C211E80E6 for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 15:02:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.621 X-Spam-Level: X-Spam-Status: No, score=-2.621 tagged_above=-999 required=5 tests=[AWL=0.355, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Y-q6v2WrsPkY for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 15:02:21 -0700 (PDT) Received: from mail-pb0-f48.google.com (mail-pb0-f48.google.com [209.85.160.48]) by ietfa.amsl.com (Postfix) with ESMTP id B6AE511E821B for <6tsch@ietf.org>; Mon, 26 Aug 2013 15:02:17 -0700 (PDT) Received: by mail-pb0-f48.google.com with SMTP id ma3so3924742pbc.7 for <6tsch@ietf.org>; Mon, 26 Aug 2013 15:02:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=J5lP6YoQMbj2tdd+74ep0lF17imzrNh5mn1mrIoq/JE=; b=VcJ4KRXcPHEXTy00rMV/NTCT7ZCVYB0gDywB34qmUg4lKILYLLbSyjIdVyet6RdI/i NcOwYOLZLx4UOUSi6LgXUMUoD4pG+6PQNGDm09sUlZOF643xR640Ty0DZ2ZVa+fFIrpz xv1zKpJH/4d3HHDX2GXguP6RaY/GT7RkZ6AzKQ+plwce0AidpHWEt0DbCMiGkve/QyVW T4fTZ/He1L80pygth1CnyKkfxg9nzXAlKtkZPUZO2aSY36QnUokhRGh6K7i/iBQaiyMt T5BSiea1uvcJquasCtJP8N1l9Jb5QZWxCgd/wutqeUMG95JF5sMlOHuFaTax3cLqMsfA yvgw== X-Gm-Message-State: ALoCoQkJ84zUotUEVkdbL1VwxoUwEqcR4D+FETiiD0KZy+utlcW/7AEqj3r/6hzlEvoVV/NBHvxK MIME-Version: 1.0 X-Received: by 10.66.253.100 with SMTP id zz4mr16570973pac.48.1377554533929; Mon, 26 Aug 2013 15:02:13 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Mon, 26 Aug 2013 15:02:13 -0700 (PDT) In-Reply-To: References: Date: Mon, 26 Aug 2013 15:02:13 -0700 Message-ID: From: Xavier Vilajosana Guillen To: "Prof. Diego Dujovne" Content-Type: multipart/alternative; boundary=047d7b15a0d5a7657004e4e0e80b Cc: "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Aug 2013 22:02:25 -0000 --047d7b15a0d5a7657004e4e0e80b Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi all, I prefer 6TiSCH. :-) X On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujovne < diego.dujovne@mail.udp.cl> wrote: > Pascal, > I agree with the 6LoTuS to include other TDMAs as long as the > IETF accepts a wider scope. From the architecture point of view, I think > other TDMAs should be supported by a 6top-like layer, in order to stay > on top of the MAC layer. > Regards, > > Diego Dujovne > > 2013/8/26 Pascal Thubert (pthubert) : > > Dear all; > > > > 6TiSCH is the winner of the Condorcet vote. > > > > There was a good point on the ML that we might extend our work in the > future to other MACs that are still deterministic (based on TDM) but not > necessarily channel hopping. > > I wanted to take a very quick poll on the alternate name 6LoTuS that > indicates the family trait with other low power activities ( the lo prefi= x) > and focusses on the Time Slotted aspect. > > > > If you really like the 6LoTuS name better (than 6TiSCH) please let us > know in the coming days. We really want to make the request by the end o= f > this week. > > > > Cheers, > > > > Pascal and Thomas > > > > _______________________________________________ > > 6tsch mailing list > > 6tsch@ietf.org > > https://www.ietf.org/mailman/listinfo/6tsch > > > > -- > DIEGO DUJOVNE > Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones > Facultad de Ingenier=EDa UDP > www.ingenieria.udp.cl > (56 2) 676 8125 > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > --047d7b15a0d5a7657004e4e0e80b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi all, I prefer 6TiSCH.

    :-)
    X


    On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujovne <diego.dujovne@mail.udp.cl> wrote:
    Pascal,
    =A0 =A0 =A0 =A0 =A0 I agree with the 6LoTuS to include other TDMAs as long = as the
    IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay
    on top of the MAC layer.
    =A0 =A0 =A0 =A0 =A0 Regards,

    =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= Diego Dujovne

    2013/8/26 Pascal Thubert (pthubert) <pthubert@cisco.com>:
    > Dear all;
    >
    > 6TiSCH is the winner of the Condorcet vote.
    >
    > There was a good point on the ML that we might extend our work in the = future to other MACs that are still deterministic (based on TDM) but not ne= cessarily channel hopping.
    > I wanted to take a very quick poll on the alternate name 6LoTuS that i= ndicates the family trait with other low power activities ( the lo prefix) = and focusses on the Time Slotted aspect.
    >
    > If you really like the 6LoTuS name better (than 6TiSCH) please let us = know in the coming days. =A0We really want to make the request by the end o= f this week.
    >
    > Cheers,
    >
    > Pascal and Thomas
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org
    > https://www.ietf.org/mailman/listinfo/6tsch



    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125
    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    --047d7b15a0d5a7657004e4e0e80b-- From qinwang@berkeley.edu Mon Aug 26 15:38:20 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BCEA111E80F9 for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 15:38:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.909 X-Spam-Level: X-Spam-Status: No, score=-2.909 tagged_above=-999 required=5 tests=[AWL=0.067, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uYF+gpG2gqzd for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 15:38:13 -0700 (PDT) Received: from mail-vc0-f173.google.com (mail-vc0-f173.google.com [209.85.220.173]) by ietfa.amsl.com (Postfix) with ESMTP id 1B64E11E80F5 for <6tsch@ietf.org>; Mon, 26 Aug 2013 15:38:11 -0700 (PDT) Received: by mail-vc0-f173.google.com with SMTP id id13so2582761vcb.32 for <6tsch@ietf.org>; Mon, 26 Aug 2013 15:38:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=OhJJ3DymYcHopkYOaV3VjW37FeVjMvkVwdQpHjI2MEg=; b=pqo42YyaZQMKfnbkn45slKHX7tqKrcfPzylnMylaiveFU1s92I57ouZWMHHe7MT/e4 a43Ltl657cQgM4Oi4AfxYMzsi00ilTugA0cGK3zUSclGZNn52NBV8f3Sxf9IM+i4dKiV 0DAwrcFACL7P9uIFFojrJyQlghmUllrrwP7L3Dkqq0ZEGhH3+WlHQXRbodMGBbqo4ur1 79g34LVJgNjtjFmsJheUWosSBI8NBHOWMDVRLZoDAvwfJGkdj0VSLXYFGNW4t733LXUj Ip9dpOa9iKQXwUbpOUMmHbYjLmZbFLaCJpiHzVmAFjw2Xslya8X9pEHfa4oaY2nJC3H5 s94Q== X-Gm-Message-State: ALoCoQmcpvweSkO2/TtKdVXJdVwiiqN3zxqMSCvQYQnzccZ1w3c7j6WMqNCESSYDKEH4SrsFRuAv MIME-Version: 1.0 X-Received: by 10.220.237.208 with SMTP id kp16mr16793741vcb.4.1377556691443; Mon, 26 Aug 2013 15:38:11 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Mon, 26 Aug 2013 15:38:11 -0700 (PDT) Date: Tue, 27 Aug 2013 06:38:11 +0800 Message-ID: From: Qin Wang To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b343464406f1e04e4e16962 Subject: [6tsch] format of management message X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Aug 2013 22:38:20 -0000 --047d7b343464406f1e04e4e16962 Content-Type: text/plain; charset=ISO-8859-1 Dear All, According to last Friday's call, we start the thread to discuss the format of management message. Background: The management messages are exchanged between a Management Entity (ME) and 6top, and the ME can be existing in PCE or upper layer of 6top. In some other threads, we have been discussing about the control flows and the content of control flows, which can be used as reference. Consideration: (1) Where the format will be used? IMHO, the format, which we are talking about, is only used to express the exchanged messages, it should not be used in storage like MIB. Thus, Compacting is a process of translating the data in storage format to the data in message format, and De-compacting is a reverse process. Make sense? (2) Criteria of evaluation. -- Compact data size -- Computational complexity of Compacting/De-compacting -- tool is existing or not -- .... more? (3) Candidates: CBOR, JSON, BSON, and ...... Any comments and suggestions are welcome. Thanks Qin --047d7b343464406f1e04e4e16962 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Dear All,

    According to last Friday'= s call, we start the thread to discuss the format of management message.=A0=

    Background:
    The management messages are= exchanged between a Management Entity (ME) and 6top, and the ME can be exi= sting in PCE or upper layer of 6top. In some other threads, we have been di= scussing about the control flows and the content of control flows, which ca= n be used as reference.

    Consideration:
    (1) Where the format will be u= sed? IMHO, the format, which we are talking about, is only used to express = the exchanged messages, it should not be used in storage like MIB. Thus, Co= mpacting is a process of translating the data in storage format to the data= in message format, and De-compacting is a reverse process. Make sense?
    =A0=A0
    (2) Criteria of evaluation.=A0
    =A0 =A0 -- C= ompact data size
    =A0 =A0 -- Computational complexity of Compactin= g/De-compacting
    =A0 =A0 -- tool is existing or not
    =A0 = =A0 -- .... more?

    (3) Candidates: CBOR, JSON, BSON, and ......
    = =A0
    Any comments and suggestions are welcome.

    Thanks
    Qin
    --047d7b343464406f1e04e4e16962-- From qinwang@berkeley.edu Mon Aug 26 15:39:15 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E0E9821F9C87 for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 15:39:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.912 X-Spam-Level: X-Spam-Status: No, score=-2.912 tagged_above=-999 required=5 tests=[AWL=0.064, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Hiu2++0gfoh7 for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 15:39:12 -0700 (PDT) Received: from mail-vb0-f43.google.com (mail-vb0-f43.google.com [209.85.212.43]) by ietfa.amsl.com (Postfix) with ESMTP id BD69121F9A7E for <6tsch@ietf.org>; Mon, 26 Aug 2013 15:39:11 -0700 (PDT) Received: by mail-vb0-f43.google.com with SMTP id h11so2611540vbh.30 for <6tsch@ietf.org>; Mon, 26 Aug 2013 15:39:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=No+dYQVrxK2ETrM3cRgAg10gIqyWcK0NcFPCay2QB3Q=; b=PshTmtEnge5QRZam+vicgDxG+MviAD542xpjdCVB4JLlIj5T3GMumeRhjGIsASodS7 wsPlbsVbu4+MgFpyGpfvP5UgFlPirOOO9C6DKKSRTleLFzat0G0uIXr1SnSapynnMM39 4hryvN+VwEiCABa545NItYYfZ2Ggi1IKWhKjqoNOPeSh1EMHDvXW6TomWSecEZV7GH3m 4oZRR8qS41hMGwGmNAFnmZJEiiRMrXuQICWevJb2a9eNfuc4YZLJEJZi4Moa8luPi8v5 PNChqP/d7WTjmQ5RAo4TUDeZ5dopisxY/hjg3eVf5XH6kUKqeNBKqKxlrYmR4YkkrYeg 4o7Q== X-Gm-Message-State: ALoCoQmAlnfcr2pPkfbB93Sy4nX6O5eidEt4bq47OHx8kze2U/L1IokkSvH1Ig28WGRVst5+Pbh2 MIME-Version: 1.0 X-Received: by 10.52.92.15 with SMTP id ci15mr35627vdb.34.1377556751203; Mon, 26 Aug 2013 15:39:11 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Mon, 26 Aug 2013 15:39:11 -0700 (PDT) In-Reply-To: References: Date: Tue, 27 Aug 2013 06:39:11 +0800 Message-ID: From: Qin Wang To: Xavier Vilajosana Guillen Content-Type: multipart/alternative; boundary=20cf307f3112d04fb504e4e16cf5 Cc: "Pascal Thubert \(pthubert\)" , "Prof. Diego Dujovne" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Aug 2013 22:39:16 -0000 --20cf307f3112d04fb504e4e16cf5 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable +1 to 6TiSCH. Qin On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi all, I prefer 6TiSCH. > > :-) > X > > > On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujovne < > diego.dujovne@mail.udp.cl> wrote: > >> Pascal, >> I agree with the 6LoTuS to include other TDMAs as long as the >> IETF accepts a wider scope. From the architecture point of view, I think >> other TDMAs should be supported by a 6top-like layer, in order to stay >> on top of the MAC layer. >> Regards, >> >> Diego Dujovne >> >> 2013/8/26 Pascal Thubert (pthubert) : >> > Dear all; >> > >> > 6TiSCH is the winner of the Condorcet vote. >> > >> > There was a good point on the ML that we might extend our work in the >> future to other MACs that are still deterministic (based on TDM) but not >> necessarily channel hopping. >> > I wanted to take a very quick poll on the alternate name 6LoTuS that >> indicates the family trait with other low power activities ( the lo pref= ix) >> and focusses on the Time Slotted aspect. >> > >> > If you really like the 6LoTuS name better (than 6TiSCH) please let us >> know in the coming days. We really want to make the request by the end = of >> this week. >> > >> > Cheers, >> > >> > Pascal and Thomas >> > >> > _______________________________________________ >> > 6tsch mailing list >> > 6tsch@ietf.org >> > https://www.ietf.org/mailman/listinfo/6tsch >> >> >> >> -- >> DIEGO DUJOVNE >> Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicacione= s >> Facultad de Ingenier=EDa UDP >> www.ingenieria.udp.cl >> (56 2) 676 8125 >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --20cf307f3112d04fb504e4e16cf5 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    +1 to 6TiSCH.

    Qin


    On Tue, Aug 27, 2013 at= 6:02 AM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley= .edu> wrote:
    Hi all, I prefer = 6TiSCH.

    :-)
    =
    X
    =

    On Mon, Aug 26, 2013 at 12:31 PM, Prof. = Diego Dujovne <diego.dujovne@mail.udp.cl> wrote:
    Pascal,
    =A0 =A0 =A0 =A0 =A0 I agree with the 6LoTuS to include other TDMAs as long = as the
    IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay
    on top of the MAC layer.
    =A0 =A0 =A0 =A0 =A0 Regards,

    =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= Diego Dujovne

    2013/8/26 Pascal Thubert (pthubert) <pthubert@cisco.com>:
    > Dear all;
    >
    > 6TiSCH is the winner of the Condorcet vote.
    >
    > There was a good point on the ML that we might extend our work in the = future to other MACs that are still deterministic (based on TDM) but not ne= cessarily channel hopping.
    > I wanted to take a very quick poll on the alternate name 6LoTuS that i= ndicates the family trait with other low power activities ( the lo prefix) = and focusses on the Time Slotted aspect.
    >
    > If you really like the 6LoTuS name better (than 6TiSCH) please let us = know in the coming days. =A0We really want to make the request by the end o= f this week.
    >
    > Cheers,
    >
    > Pascal and Thomas
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch



    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --20cf307f3112d04fb504e4e16cf5-- From xvilajosana@berkeley.edu Mon Aug 26 15:56:15 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5380111E8252 for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 15:56:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.651 X-Spam-Level: X-Spam-Status: No, score=-2.651 tagged_above=-999 required=5 tests=[AWL=0.325, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BQHzxFY+mEoc for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 15:56:02 -0700 (PDT) Received: from mail-pb0-f50.google.com (mail-pb0-f50.google.com [209.85.160.50]) by ietfa.amsl.com (Postfix) with ESMTP id BD51A11E823A for <6tsch@ietf.org>; Mon, 26 Aug 2013 15:56:01 -0700 (PDT) Received: by mail-pb0-f50.google.com with SMTP id uo5so3991811pbc.23 for <6tsch@ietf.org>; Mon, 26 Aug 2013 15:56:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=DaioP9keoaNFbdDf89t/9BUUC2R1cBHoC7dnKEL1pqU=; b=pqRpdMERIQZH2olEGuhKtcLeIDj6sz0QEDSnZA72Qqj86NkC+BWDrP1YdsC5lEdKoa J3foZBzrjfKJK/XXC0aalMNi8C/Cy/6+DL6oxDz8Pb/5qjePZCC4FgJXQrkBe1GPvR54 moBla7iMfLQTjzrR9Vmc1AF26bL5sK4QJgCgmFiRulIKfKGvgYdlPvGKQeu/lMMOJz7p uL5MjtOCSc8YTKT3CpFjkGOBJullIiimHENzYYuHWr/EHBWSssxocX56Dav2N9GemMTj OzcSA9gGYof2y/QyTY+/zz3Yc7wOMDjUHOwVpqXiGqyEHFN8ehTc4VAc0r0KCo8xwRz+ qm1Q== X-Gm-Message-State: ALoCoQlwLSLCfvCwjteOMOGmlKSY9oFdUXbIGJ5F24fjFuAqTClW8kUnX2jPJj242jgHBJTzeRRL MIME-Version: 1.0 X-Received: by 10.68.189.5 with SMTP id ge5mr17967721pbc.42.1377557760892; Mon, 26 Aug 2013 15:56:00 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Mon, 26 Aug 2013 15:56:00 -0700 (PDT) In-Reply-To: References: Date: Mon, 26 Aug 2013 15:56:00 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=e89a8ff1c94cfeec8404e4e1a890 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] format of management message X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Aug 2013 22:56:15 -0000 --e89a8ff1c94cfeec8404e4e1a890 Content-Type: text/plain; charset=ISO-8859-1 Hi Qin, I see it like you indicate at (1). The format and encoding is only used in the payload of exchanged messages. as regards to (2) - 1) Computational complexity is a limiting factor if we want to be able to run in 8bit uC. So this is important. - 2) Compact data size. This can be easily experimented as soon as we have some formats defined. - 3) I don't think the tool is a problem as most of this formats have a tool. (3) I know about EXI (Efficeint XML) which compares to ASN.1. I am not an expert of that and I do not know if BSON or CBOR perform better but it might be another candidate. X On Mon, Aug 26, 2013 at 3:38 PM, Qin Wang wrote: > Dear All, > > According to last Friday's call, we start the thread to discuss the format > of management message. > > Background: > The management messages are exchanged between a Management Entity (ME) and > 6top, and the ME can be existing in PCE or upper layer of 6top. In some > other threads, we have been discussing about the control flows and the > content of control flows, which can be used as reference. > > Consideration: > (1) Where the format will be used? IMHO, the format, which we are talking > about, is only used to express the exchanged messages, it should not be > used in storage like MIB. Thus, Compacting is a process of translating the > data in storage format to the data in message format, and De-compacting is > a reverse process. Make sense? > > (2) Criteria of evaluation. > -- Compact data size > -- Computational complexity of Compacting/De-compacting > -- tool is existing or not > -- .... more? > > (3) Candidates: CBOR, JSON, BSON, and ...... > > Any comments and suggestions are welcome. > > Thanks > Qin > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --e89a8ff1c94cfeec8404e4e1a890 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Qin,

    I see it like you indicate = at (1). The format and encoding is only used in the payload of exchanged me= ssages.

    as regards to (2)
    - 1) Computatio= nal complexity is a limiting factor if we want to be able to run in 8bit uC= . So this is important.
    - 2) Compact data size. This can be easily experimented as soon = as we have some formats defined.
    - 3) I don't think the = tool is a problem as most of this formats have a tool.

    (3) I know about EXI (Efficeint XML) which compares to ASN.1. I am not an e= xpert of that and I do not know if BSON or CBOR perform better but it might= be another candidate.

    X


    On Mon, Aug 26, 2013 at 3:38 PM, Qin Wan= g <qinwang@berkeley.edu> wrote:
    Dear All,

    According to last Friday'= s call, we start the thread to discuss the format of management message.=A0=

    Background:
    The management messages are= exchanged between a Management Entity (ME) and 6top, and the ME can be exi= sting in PCE or upper layer of 6top. In some other threads, we have been di= scussing about the control flows and the content of control flows, which ca= n be used as reference.

    Consideration:
    (1) Where the format will be u= sed? IMHO, the format, which we are talking about, is only used to express = the exchanged messages, it should not be used in storage like MIB. Thus, Co= mpacting is a process of translating the data in storage format to the data= in message format, and De-compacting is a reverse process. Make sense?
    =A0=A0
    (2) Criteria of evaluation.=A0
    =A0 =A0 -- C= ompact data size
    =A0 =A0 -- Computational complexity of Compactin= g/De-compacting
    =A0 =A0 -- tool is existing or not
    =A0 = =A0 -- .... more?

    (3) Candidates: CBOR, JSON, BSON, and ......
    = =A0
    Any comments and suggestions are welcome.

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --e89a8ff1c94cfeec8404e4e1a890-- From maria-rita.palattella@uni.lu Mon Aug 26 23:21:04 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3C40111E8147 for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 23:21:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.298 X-Spam-Level: X-Spam-Status: No, score=-6.298 tagged_above=-999 required=5 tests=[AWL=0.300, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YEFeQkpwsWsl for <6tsch@ietfa.amsl.com>; Mon, 26 Aug 2013 23:21:00 -0700 (PDT) Received: from hercules.uni.lu (hercules.uni.lu [158.64.76.33]) by ietfa.amsl.com (Postfix) with ESMTP id A035A11E8125 for <6tsch@ietf.org>; Mon, 26 Aug 2013 23:20:59 -0700 (PDT) X-IronPort-AV: E=Sophos;i="4.89,966,1367964000"; d="scan'208,217";a="26100470" Received: from unknown (HELO Archer.uni.lux) ([10.21.2.1]) by hercules.uni.lu with ESMTP; 27 Aug 2013 08:20:57 +0200 Received: from HOSHI.uni.lux ([fe80::499:a33:4e68:4af9]) by Archer.uni.lux ([fe80::1009:b1e7:2b72:f0b8%10]) with mapi id 14.03.0158.001; Tue, 27 Aug 2013 08:20:57 +0200 From: Maria Rita PALATTELLA To: Qin Wang , Xavier Vilajosana Guillen Thread-Topic: [6tsch] 6TiSCH or not 6TiSCH ? Thread-Index: Ac6ibwlh8LHk3ndPTEO2PUrHzyUm9AAEwfoAAAVFmoAAAUqCgAAUTdbw Date: Tue, 27 Aug 2013 06:20:56 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.91.0.65] Content-Type: multipart/alternative; boundary="_000_F085911F642A6847987ADA23E611780D1858E2AEhoshiunilux_" MIME-Version: 1.0 Cc: "Pascal Thubert \(pthubert\)" , "Prof. Diego Dujovne" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 06:21:04 -0000 --_000_F085911F642A6847987ADA23E611780D1858E2AEhoshiunilux_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I also do prefer 6TiSCH. Maria Rita From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Q= in Wang Sent: Tuesday, August 27, 2013 12:39 AM To: Xavier Vilajosana Guillen Cc: Pascal Thubert (pthubert); Prof. Diego Dujovne; 6tsch@ietf.org Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? +1 to 6TiSCH. Qin On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana Guillen > wrote: Hi all, I prefer 6TiSCH. :-) X On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujovne > wrote: Pascal, I agree with the 6LoTuS to include other TDMAs as long as the IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay on top of the MAC layer. Regards, Diego Dujovne 2013/8/26 Pascal Thubert (pthubert) >: > Dear all; > > 6TiSCH is the winner of the Condorcet vote. > > There was a good point on the ML that we might extend our work in the fut= ure to other MACs that are still deterministic (based on TDM) but not neces= sarily channel hopping. > I wanted to take a very quick poll on the alternate name 6LoTuS that indi= cates the family trait with other low power activities ( the lo prefix) and= focusses on the Time Slotted aspect. > > If you really like the 6LoTuS name better (than 6TiSCH) please let us kno= w in the coming days. We really want to make the request by the end of thi= s week. > > Cheers, > > Pascal and Thomas > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_F085911F642A6847987ADA23E611780D1858E2AEhoshiunilux_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    I also do prefer 6TiSCH.<= o:p>

     <= /p>

    Maria Rita

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 27, 2013 12:39 AM
    To: Xavier Vilajosana Guillen
    Cc: Pascal Thubert (pthubert); Prof. Diego Dujovne; 6tsch@ietf.org Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ?

     

    +1 to 6TiSCH.

     

    Qin

     

    On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    Hi all, I prefer 6TiS= CH.

    :-)

    X

     

    On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujovn= e <diego.= dujovne@mail.udp.cl> wrote:

    Pascal,
              I agree with the 6LoTuS to include other= TDMAs as long as the
    IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay
    on top of the MAC layer.
              Regards,

                         = ;                Diego Dujovne

    2013/8/26 Pascal Thubert (pthubert) <pthubert@cisco.com>:

    > Dear all;
    >
    > 6TiSCH is the winner of the Condorcet vote.
    >
    > There was a good point on the ML that we might extend our work in the = future to other MACs that are still deterministic (based on TDM) but not ne= cessarily channel hopping.
    > I wanted to take a very quick poll on the alternate name 6LoTuS that i= ndicates the family trait with other low power activities ( the lo prefix) = and focusses on the Time Slotted aspect.
    >
    > If you really like the 6LoTuS name better (than 6TiSCH) please let us = know in the coming days.  We really want to make the request by the en= d of this week.
    >
    > Cheers,
    >
    > Pascal and Thomas
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch


    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_F085911F642A6847987ADA23E611780D1858E2AEhoshiunilux_-- From alfredo.grieco@gmail.com Tue Aug 27 01:39:22 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D5ACC11E8134 for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 01:39:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nED3M8tjRwXM for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 01:39:21 -0700 (PDT) Received: from mail-la0-x231.google.com (mail-la0-x231.google.com [IPv6:2a00:1450:4010:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id 0882A21F9B58 for <6tsch@ietf.org>; Tue, 27 Aug 2013 01:39:18 -0700 (PDT) Received: by mail-la0-f49.google.com with SMTP id ev20so3159402lab.8 for <6tsch@ietf.org>; Tue, 27 Aug 2013 01:39:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=P8ON4HYMs7YyrqJNmtUf/CH79nXLa7eVPt6A2ytzbAE=; b=TvR87zWKZdX/eNEVyN8DUxRQnWxZ7898xXYE8j+ecyVoljLjuT5mSSEgYo5PoPLSf3 pw9JR8IaA//IoBslnXVK48gRaBmqZnhY44QIXPt4HD8hP8fuAsnv/+VKu0dzNg0sEIDj WcMg/0EtgUmYfSjg4jk88fdzzuDkEQv+90Cw9qknx/327X4RVBu5Vo5ZNwuwPgK2CAye Y7fXSYBdbN2lefnMAVEDsYoQWZbipUSNH6PxX7Au68LgVdZMJ3y5xunbK/DggoGcsUcP aCHyRygTFUR4y8Xd/pngB0ocjlcY+jt46bIeNPZ10cFhtADsphmdAierWYj5MRC+3txx CitQ== MIME-Version: 1.0 X-Received: by 10.112.210.136 with SMTP id mu8mr10692980lbc.25.1377592756440; Tue, 27 Aug 2013 01:39:16 -0700 (PDT) Received: by 10.114.79.103 with HTTP; Tue, 27 Aug 2013 01:39:16 -0700 (PDT) In-Reply-To: References: Date: Tue, 27 Aug 2013 10:39:16 +0200 Message-ID: From: Alfredo Grieco To: Maria Rita PALATTELLA Content-Type: multipart/alternative; boundary=001a11c3c704e4955f04e4e9ce23 Cc: "6tsch@ietf.org" <6tsch@ietf.org>, "Pascal Thubert \(pthubert\)" , "Prof. Diego Dujovne" , Xavier Vilajosana Guillen , Qin Wang Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 08:39:23 -0000 --001a11c3c704e4955f04e4e9ce23 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable +1 for 6TiSCH. Ciao. Al On Tuesday, August 27, 2013, Maria Rita PALATTELLA wrote: > I also do prefer 6TiSCH.**** > > ** ** > > Maria Rita**** > > ** ** > > *From:* 6tsch-bounces@ietf.org '6tsch-bounces@ietf.org');> [mailto:6tsch-bounces@ietf.org] > *On Behalf Of *Qin Wang > *Sent:* Tuesday, August 27, 2013 12:39 AM > *To:* Xavier Vilajosana Guillen > *Cc:* Pascal Thubert (pthubert); Prof. Diego Dujovne; 6tsch@ietf.org > *Subject:* Re: [6tsch] 6TiSCH or not 6TiSCH ?**** > > ** ** > > +1 to 6TiSCH.**** > > ** ** > > Qin**** > > ** ** > > On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu 'xvilajosana@eecs.berkeley.edu');>> wrote:**** > > Hi all, I prefer 6TiSCH.**** > > :-)**** > > X**** > > ** ** > > On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujovne < > diego.dujovne@mail.udp.cl 'diego.dujovne@mail.udp.cl');>> wrote:**** > > Pascal, > I agree with the 6LoTuS to include other TDMAs as long as the > IETF accepts a wider scope. From the architecture point of view, I think > other TDMAs should be supported by a 6top-like layer, in order to stay > on top of the MAC layer. > Regards, > > Diego Dujovne > > 2013/8/26 Pascal Thubert (pthubert) > >:**** > > > Dear all; > > > > 6TiSCH is the winner of the Condorcet vote. > > > > There was a good point on the ML that we might extend our work in the > future to other MACs that are still deterministic (based on TDM) but not > necessarily channel hopping. > > I wanted to take a very quick poll on the alternate name 6LoTuS that > indicates the family trait with other low power activities ( the lo prefi= x) > and focusses on the Time Slotted aspect. > > > > If you really like the 6LoTuS name better (than 6TiSCH) please let us > know in the coming days. We really want to make the request by the end o= f > this week. > > > > Cheers, > > > > Pascal and Thomas > > > > _______________________________________________ > > 6tsch mailing list > > 6tsch@ietf.org > > https://www.ietf.org/mailman/listinfo/6tsch > > > **** > > -- > DIEGO DUJOVNE > Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones > Facultad de Ingenier=EDa UDP > www.ingenieria.udp.cl > (56 2) 676 8125**** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --001a11c3c704e4955f04e4e9ce23 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable +1 for 6TiSCH. Ciao. Al

    On Tuesday, August 27, 2013, Ma= ria Rita PALATTELLA wrote:

    I also do prefer 6TiSCH.<= u>

    =A0<= /p>

    Maria Rita<= /span>

    =A0<= /p>

    From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 27, 2013 12:39 AM
    To: Xavier Vilajosana Guillen
    Cc: Pascal Thubert (pthubert); Prof. Diego Dujovne; = 6tsch@ietf.org
    Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ?

    =A0

    +1 to 6TiSCH.

    =A0

    Qin

    =A0

    On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu= > wrote:

    Hi all, I prefer 6TiS= CH.

    :-)

    X=

    =A0

    On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujovn= e <diego.dujovne@mail.udp.cl> wrote:

    Pascal,
    =A0 =A0 =A0 =A0 =A0 I agree with the 6LoTuS to include other TDMAs as long = as the
    IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay
    on top of the MAC layer.
    =A0 =A0 =A0 =A0 =A0 Regards,

    =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= Diego Dujovne

    2013/8/26 Pascal Thubert (pthubert) <pthubert@cisco.= com>:

    > Dear all;
    >
    > 6TiSCH is the winner of the Condorcet vote.
    >
    > There was a good point on the ML that we might extend our work in the = future to other MACs that are still deterministic (based on TDM) but not ne= cessarily channel hopping.
    > I wanted to take a very quick poll on the alternate name 6LoTuS that i= ndicates the family trait with other low power activities ( the lo prefix) = and focusses on the Time Slotted aspect.
    >
    > If you really like the 6LoTuS name better (than 6TiSCH) please let us = know in the coming days. =A0We really want to make the request by the end o= f this week.
    >
    > Cheers,
    >
    > Pascal and Thomas
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org
    > https://www.ietf.org/mailman/listinfo/6tsch


    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    --001a11c3c704e4955f04e4e9ce23-- From pwetterw@cisco.com Tue Aug 27 01:54:50 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E864C11E8172 for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 01:54:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id S1rQQFWjt1sO for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 01:54:46 -0700 (PDT) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id 1284411E816F for <6tsch@ietf.org>; Tue, 27 Aug 2013 01:54:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=12666; q=dns/txt; s=iport; t=1377593686; x=1378803286; h=from:to:cc:subject:date:message-id:in-reply-to: mime-version; bh=Lh2JS35MWj+dssrPpaRu7Q027lOACkPGKi/76YIFbj0=; b=RoTWKmXqBO78y0VY44U64J6+W6jHLQu0stvjJDmZGD8LpwetnUaimlsy B0onlfNOfI7oQXN+MLFgYpwgtCIq46VCxS/7Jd7C2y9eUACk92TjskdKf qqXAbczPdf4GXNeOWIh6D0mZ6gWS/tBTkbPYpA8wuzOX05EjfuJuWK4vA w=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhoFAAtoHFKtJXG8/2dsb2JhbABagkNENVHALIEkFnSCJAEBAQMBAQEBRiULBQ0BCBEBAgEBAQsdKAYLFAMGCAIEAQ0FCIdnAwkGDK5ADYlnAwaCVIslgT8BgQcgDQEDBgEGA4MTfQOIeYsbgXGOHoUsgx6BcTk X-IronPort-AV: E=Sophos;i="4.89,966,1367971200"; d="scan'208,217";a="251855679" Received: from rcdn-core2-1.cisco.com ([173.37.113.188]) by rcdn-iport-1.cisco.com with ESMTP; 27 Aug 2013 08:54:45 +0000 Received: from xhc-aln-x15.cisco.com (xhc-aln-x15.cisco.com [173.36.12.89]) by rcdn-core2-1.cisco.com (8.14.5/8.14.5) with ESMTP id r7R8sjBf014150 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 27 Aug 2013 08:54:45 GMT Received: from xmb-rcd-x03.cisco.com ([169.254.7.234]) by xhc-aln-x15.cisco.com ([173.36.12.89]) with mapi id 14.02.0318.004; Tue, 27 Aug 2013 03:54:45 -0500 From: "Patrick Wetterwald (pwetterw)" To: Alfredo Grieco , Maria Rita PALATTELLA Thread-Topic: [6tsch] 6TiSCH or not 6TiSCH ? Thread-Index: AQHOowMTFAqvcWwzE0+Cxj1WR6hXMA== Date: Tue, 27 Aug 2013 08:54:44 +0000 Message-ID: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.3.4.130416 x-originating-ip: [10.49.80.22] Content-Type: multipart/alternative; boundary="_000_C3B7A524F2C9CC40A5C5CB46EA2B393C10048E3Dxmbrcdx03ciscoc_" MIME-Version: 1.0 Cc: "6tsch@ietf.org" <6tsch@ietf.org>, "Prof. Diego Dujovne" , "Pascal Thubert \(pthubert\)" , Xavier Vilajosana Guillen , Qin Wang Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 08:54:51 -0000 --_000_C3B7A524F2C9CC40A5C5CB46EA2B393C10048E3Dxmbrcdx03ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ISH does not sound right for a working group related to determinism. ISH in english is more similar to "approximately, about, roughly". Is it re= ally the message we want to carry? I don't think so. IMHO 6LoTus is more appropriate for a working group name. Patrick From: Alfredo Grieco > Date: Tuesday, August 27, 2013 10:39 AM To: Maria Rita PALATTELLA > Cc: "6tsch@ietf.org" <6tsch@ietf.org>, Pascal THUBERT >, "= Prof. Diego Dujovne" >, Xavier Vilajosana Guillen >, Qin Wang > Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? +1 for 6TiSCH. Ciao. Al On Tuesday, August 27, 2013, Maria Rita PALATTELLA wrote: I also do prefer 6TiSCH. Maria Rita From:6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 27, 2013 12:39 AM To: Xavier Vilajosana Guillen Cc: Pascal Thubert (pthubert); Prof. Diego Dujovne; 6tsch@ietf.org Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? +1 to 6TiSCH. Qin On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana Guillen > wrote: Pascal, I agree with the 6LoTuS to include other TDMAs as long as the IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay on top of the MAC layer. Regards, Diego Dujovne 2013/8/26 Pascal Thubert (pthubert) >: > Dear all; > > 6TiSCH is the winner of the Condorcet vote. > > There was a good point on the ML that we might extend our work in the fut= ure to other MACs that are still deterministic (based on TDM) but not neces= sarily channel hopping. > I wanted to take a very quick poll on the alternate name 6LoTuS that indi= cates the family trait with other low power activities ( the lo prefix) and= focusses on the Time Slotted aspect. > > If you really like the 6LoTuS name better (than 6TiSCH) please let us kno= w in the coming days. We really want to make the request by the end of thi= s week. > > Cheers, > > Pascal and Thomas > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_C3B7A524F2C9CC40A5C5CB46EA2B393C10048E3Dxmbrcdx03ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable
    ISH does not sound right for a working group related to determinism.

    ISH in english is more similar to "approximately, about, roughly&= quot;. Is it really the message we want to carry? I don't think so.

    IMHO 6LoTus is more appropriate for a working group name.

    Patrick

    From: Alfredo Grieco <alfredo.grieco@gmail.com>
    Date: Tuesday, August 27, 2013 10:3= 9 AM
    To: Maria Rita PALATTELLA <maria-rita.palattella@uni.lu= >
    Cc: "6tsch@ietf.org" <6ts= ch@ietf.org>, Pascal THUBERT <pthubert@cisco.com>, "Prof. Diego Dujovne" <diego.dujovne@mail.udp.cl>, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>, Qin Wang <qinwang@berkeley.edu>
    Subject: Re: [6tsch] 6TiSCH or not = 6TiSCH ?

    +1 for 6TiSCH. Ciao. Al

    On Tuesday, August 27, 2013, Maria Rita PALATTELLA wrote:

    I also do prefer 6TiSCH.=

     

    Maria Rita

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 27, 2013 12:39 AM
    To: Xavier Vilajosana Guillen
    Cc: Pascal Thubert (pthubert); Prof. Diego Dujovne; 6tsch@ietf.org
    Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ?

     

    +1 to 6TiSCH.

     

    Qin

     <= /p>

    On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    Hi all, I prefer 6TiS= CH.

    :-)

    X=

     <= /p>

    On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujovn= e <diego.dujovne@mail.udp.cl> wrote:

    Pascal,
              I agree with the 6LoTuS to include other= TDMAs as long as the
    IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay
    on top of the MAC layer.
              Regards,

                         = ;                Diego Dujovne

    2013/8/26 Pascal Thubert (pthubert) <pthubert@cisco.com>:<= /u>

    > Dear all;
    >
    > 6TiSCH is the winner of the Condorcet vote.
    >
    > There was a good point on the ML that we might extend our work in the = future to other MACs that are still deterministic (based on TDM) but not ne= cessarily channel hopping.
    > I wanted to take a very quick poll on the alternate name 6LoTuS that i= ndicates the family trait with other low power activities ( the lo prefix) = and focusses on the Time Slotted aspect.
    >
    > If you really like the 6LoTuS name better (than 6TiSCH) please let us = know in the coming days.  We really want to make the request by the en= d of this week.
    >
    > Cheers,
    >
    > Pascal and Thomas
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org
    > https://www.ietf.org/mailman/listinfo/6tsch


    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125

    _______________________________________________
    6tsch mailing list
    = 6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    = 6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     --_000_C3B7A524F2C9CC40A5C5CB46EA2B393C10048E3Dxmbrcdx03ciscoc_-- From jvasseur@cisco.com Tue Aug 27 02:04:02 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2BF5921F9A71 for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 02:04:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PIARYZbCZc2v for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 02:03:57 -0700 (PDT) Received: from rcdn-iport-9.cisco.com (rcdn-iport-9.cisco.com [173.37.86.80]) by ietfa.amsl.com (Postfix) with ESMTP id 5E29221F99DD for <6tsch@ietf.org>; Tue, 27 Aug 2013 02:03:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=13998; q=dns/txt; s=iport; t=1377594236; x=1378803836; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=8HTJ2SWfeI9rv/eQ7uTlLtANOI40mh3LfEhHcgf4ehE=; b=LmKYjsYRlijavHptB1ekTvXe8pUm9aMXFIZj/upA2C42EsSmbuHDZU5u xpZkjRMJ2RJcfaHdb/dWx+V2zChujajdySgmP2vhpsIK9GXR0zd3tXgjy HggjsHT1sGOcB7t7gvNosWaUR/BoAwHA2f1s5VsEEfUINfCEgJqsz/baE E=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhwFAOpqHFKtJV2d/2dsb2JhbABagkNENUUMt2mIQ4EkFnSCJAEBAQMBAQEBRiULBQsCARkBAgEBAQsdByEGCxQDBggCBAENBQiHZwMJBgyuPA2JZwMGglSLJYE/AYEHIA0BAwYBBgODE30DiHmLG4FxgxaLCIUsgx6BcTk X-IronPort-AV: E=Sophos;i="4.89,967,1367971200"; d="scan'208,217";a="249053690" Received: from rcdn-core-6.cisco.com ([173.37.93.157]) by rcdn-iport-9.cisco.com with ESMTP; 27 Aug 2013 09:03:54 +0000 Received: from xhc-aln-x09.cisco.com (xhc-aln-x09.cisco.com [173.36.12.83]) by rcdn-core-6.cisco.com (8.14.5/8.14.5) with ESMTP id r7R93sID009399 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 27 Aug 2013 09:03:54 GMT Received: from xmb-rcd-x02.cisco.com ([169.254.4.198]) by xhc-aln-x09.cisco.com ([173.36.12.83]) with mapi id 14.02.0318.004; Tue, 27 Aug 2013 04:03:54 -0500 From: "JP Vasseur (jvasseur)" To: "Patrick Wetterwald (pwetterw)" , "Pascal Thubert (pthubert)" Thread-Topic: Urgent to close on name ? Re: [6tsch] 6TiSCH or not 6TiSCH ? Thread-Index: AQHOowRap45gDDJR90uZA4WcJ1FNcw== Date: Tue, 27 Aug 2013 09:03:53 +0000 Message-ID: <03B78081B371D44390ED6E7BADBB4A772371AF0D@xmb-rcd-x02.cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.60.114.230] Content-Type: multipart/alternative; boundary="_000_03B78081B371D44390ED6E7BADBB4A772371AF0Dxmbrcdx02ciscoc_" MIME-Version: 1.0 Cc: Maria Rita PALATTELLA , Alfredo Grieco , "Prof. Diego Dujovne" , Xavier Vilajosana Guillen , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang Subject: [6tsch] Urgent to close on name ? Re: 6TiSCH or not 6TiSCH ? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 09:04:02 -0000 --_000_03B78081B371D44390ED6E7BADBB4A772371AF0Dxmbrcdx02ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi ! If I may I'd rather close on the name (6LoTus seems great to me) and get th= e work start ! Thanks. JP. On Aug 27, 2013, at 10:54 AM, Patrick Wetterwald (pwetterw) > wrote: ISH does not sound right for a working group related to determinism. ISH in english is more similar to "approximately, about, roughly". Is it re= ally the message we want to carry? I don't think so. IMHO 6LoTus is more appropriate for a working group name. Patrick From: Alfredo Grieco > Date: Tuesday, August 27, 2013 10:39 AM To: Maria Rita PALATTELLA > Cc: "6tsch@ietf.org" <6tsch@ietf.org>, Pascal THUBERT >, "= Prof. Diego Dujovne" >, Xavier Vilajosana Guillen >, Qin Wang > Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? +1 for 6TiSCH. Ciao. Al On Tuesday, August 27, 2013, Maria Rita PALATTELLA wrote: I also do prefer 6TiSCH. Maria Rita From:6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 27, 2013 12:39 AM To: Xavier Vilajosana Guillen Cc: Pascal Thubert (pthubert); Prof. Diego Dujovne; 6tsch@ietf.org Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? +1 to 6TiSCH. Qin On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana Guillen > wrote: Pascal, I agree with the 6LoTuS to include other TDMAs as long as the IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay on top of the MAC layer. Regards, Diego Dujovne 2013/8/26 Pascal Thubert (pthubert) >: > Dear all; > > 6TiSCH is the winner of the Condorcet vote. > > There was a good point on the ML that we might extend our work in the fut= ure to other MACs that are still deterministic (based on TDM) but not neces= sarily channel hopping. > I wanted to take a very quick poll on the alternate name 6LoTuS that indi= cates the family trait with other low power activities ( the lo prefix) and= focusses on the Time Slotted aspect. > > If you really like the 6LoTuS name better (than 6TiSCH) please let us kno= w in the coming days. We really want to make the request by the end of thi= s week. > > Cheers, > > Pascal and Thomas > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_03B78081B371D44390ED6E7BADBB4A772371AF0Dxmbrcdx02ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable Hi !

    If I may I'd rather close on the name (6LoTus seems great to me) = and get the work start !

    Thanks.

    JP.

    On Aug 27, 2013, at 10:54 AM, Patrick Wetterwald (pwetterw) <pwetterw@cisco.com> wrote:

    ISH does not sound right for a working group related to determinism.

    ISH in english is more similar to "approximately, about, roughly&= quot;. Is it really the message we want to carry? I don't think so.

    IMHO 6LoTus is more appropriate for a working group name.

    Patrick

    From: Alfredo Grieco <alfredo.grieco@gmail.com>
    Date: Tuesday, August 27, 2013 10:3= 9 AM
    To: Maria Rita PALATTELLA <maria-rita.palattella@uni.lu= >
    Cc: "6tsch@ietf.org" <6ts= ch@ietf.org>, Pascal THUBERT <pthubert@cisco.com>, "Prof. Diego Dujovne" <diego.dujovne@mail.udp.cl>, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>, Qin Wang <qinwang@berkeley.edu>
    Subject: Re: [6tsch] 6TiSCH or not = 6TiSCH ?

    +1 for 6TiSCH. Ciao. Al

    On Tuesday, August 27, 2013, Maria Rita PALATTELLA wrote:
    I also do prefer 6TiSCH.<= u>
     
    Maria Rita<= /div>
     
    From:6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 27, 2013 12:39 AM
    To: Xavier Vilajosana Guillen
    Cc: Pascal Thubert (pthubert); Prof. Diego Dujovne; 6tsch@ietf.org
    Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ?
     
    +1 to 6TiSCH.
     
    Qin

     <= /p>

    On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana= Guillen <xvilajosana@eecs.berkeley.edu> wrote:=

    Hi all, I prefer 6TiS= CH.

    :-)
    X

     <= /p>

    On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujo= vne <diego.dujovne@mail.udp.cl> wrote:
    Pascal,
              I agree with the 6LoTuS to include other= TDMAs as long as the
    IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay
    on top of the MAC layer.
              Regards,

                         = ;                Diego Dujovne

    2013/8/26 Pascal Thubert (pthubert) <pthubert@cisco.com>:<= /u>

    > Dear all;
    >
    > 6TiSCH is the winner of the Condorcet vote.
    >
    > There was a good point on the ML that we might extend our work in the = future to other MACs that are still deterministic (based on TDM) but not ne= cessarily channel hopping.
    > I wanted to take a very quick poll on the alternate name 6LoTuS that i= ndicates the family trait with other low power activities ( the lo prefix) = and focusses on the Time Slotted aspect.
    >
    > If you really like the 6LoTuS name better (than 6TiSCH) please let us = know in the coming days.  We really want to make the request by the en= d of this week.
    >
    > Cheers,
    >
    > Pascal and Thomas
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org
    > https://www.ietf.org/mailman/listinfo/6tsch


    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.= udp.cl
    (56 2) 676 8125
    _______________________________________________ 6tsch mailing list
    = 6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch
     


    _______________________________________________
    6tsch mailing list
    = 6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    https://www.ietf.or= g/mailman/listinfo/6tsch

    --_000_03B78081B371D44390ED6E7BADBB4A772371AF0Dxmbrcdx02ciscoc_-- From dominique.barthel@orange.com Tue Aug 27 02:20:40 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1222B21E805D for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 02:20:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.597 X-Spam-Level: X-Spam-Status: No, score=-2.597 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, UNPARSEABLE_RELAY=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cGuS4k4Uz6YP for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 02:20:34 -0700 (PDT) Received: from relais-inet.francetelecom.com (relais-ias245.francetelecom.com [80.12.204.245]) by ietfa.amsl.com (Postfix) with ESMTP id 7D42221E80BD for <6tsch@ietf.org>; Tue, 27 Aug 2013 02:20:31 -0700 (PDT) Received: from omfeda05.si.francetelecom.fr (unknown [xx.xx.xx.198]) by omfeda09.si.francetelecom.fr (ESMTP service) with ESMTP id 41732C0C5A; Tue, 27 Aug 2013 11:20:30 +0200 (CEST) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.186]) by omfeda05.si.francetelecom.fr (ESMTP service) with ESMTP id 1BD7A18003E; Tue, 27 Aug 2013 11:20:30 +0200 (CEST) Received: from PEXCVZYM13.corporate.adroot.infra.ftgroup ([fe80::cc7e:e40b:42ef:164e]) by PEXCVZYH01.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.02.0328.009; Tue, 27 Aug 2013 11:20:29 +0200 From: To: "JP Vasseur (jvasseur)" , "Patrick Wetterwald (pwetterw)" , "Pascal Thubert (pthubert)" Thread-Topic: [6tsch] Urgent to close on name ? Re: 6TiSCH or not 6TiSCH ? Thread-Index: AQHOowRyFINEaowkCke5GF7gtyivLJmoxDRg Date: Tue, 27 Aug 2013 09:20:29 +0000 Message-ID: <7144_1377595230_521C6F5E_7144_260_1_8F1D83ADCC1AC94186A867BEE9B7D91306D825E9@PEXCVZYM13.corporate.adroot.infra.ftgroup> References: <03B78081B371D44390ED6E7BADBB4A772371AF0D@xmb-rcd-x02.cisco.com> In-Reply-To: <03B78081B371D44390ED6E7BADBB4A772371AF0D@xmb-rcd-x02.cisco.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.197.38.3] Content-Type: multipart/alternative; boundary="_000_8F1D83ADCC1AC94186A867BEE9B7D91306D825E9PEXCVZYM13corpo_" MIME-Version: 1.0 X-PMX-Version: 5.6.1.2065439, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2013.5.21.113319 Cc: Maria Rita PALATTELLA , Alfredo Grieco , "Prof. Diego Dujovne" , Xavier Vilajosana Guillen , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang Subject: Re: [6tsch] Urgent to close on name ? Re: 6TiSCH or not 6TiSCH ? X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 09:20:41 -0000 --_000_8F1D83ADCC1AC94186A867BEE9B7D91306D825E9PEXCVZYM13corpo_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi all, I haven't taken part in the naming discussion so far, for a reason. I want to express this reason here to let the group know of an opinion that= has not been much expressed so far. This opinion is that I don't care much for the name. I do understand the da= nger of naming conflicts, I concur with the opinion that they should be avo= ided as much as we can be aware of their risk of appearance, and this seems= to have been adequately addressed so far. Beyond that, I believe 6TiSCH or 6LoTS or 6LoTuS doesn't make much of a dif= ference. This name will be used by geeks to talk to geeks. If a commercial product needs to refer to this work in the future, it will = probably reference an RFC anyway, or even more likely marketing will invent= a new shiny name that speaks to the public. Therefore, in line with JP, I suggest at this point that the group chairs m= ake a decision and be done with it. By contrast to JP, however, I believe this discussion has not prevented the= work to start anyway ;-) Cheers, Dominique De : 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de J= P Vasseur (jvasseur) Envoy=E9 : mardi 27 ao=FBt 2013 11:04 =C0 : Patrick Wetterwald (pwetterw); Pascal Thubert (pthubert) Cc : Maria Rita PALATTELLA; Alfredo Grieco; Prof. Diego Dujovne; Xavier Vil= ajosana Guillen; 6tsch@ietf.org; Qin Wang Objet : [6tsch] Urgent to close on name ? Re: 6TiSCH or not 6TiSCH ? Hi ! If I may I'd rather close on the name (6LoTus seems great to me) and get th= e work start ! Thanks. JP. On Aug 27, 2013, at 10:54 AM, Patrick Wetterwald (pwetterw) > wrote: ISH does not sound right for a working group related to determinism. ISH in english is more similar to "approximately, about, roughly". Is it re= ally the message we want to carry? I don't think so. IMHO 6LoTus is more appropriate for a working group name. Patrick From: Alfredo Grieco > Date: Tuesday, August 27, 2013 10:39 AM To: Maria Rita PALATTELLA > Cc: "6tsch@ietf.org" <6tsch@ietf.org>, Pascal THUBERT >, "= Prof. Diego Dujovne" >, Xavier Vilajosana Guillen >, Qin Wang > Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? +1 for 6TiSCH. Ciao. Al On Tuesday, August 27, 2013, Maria Rita PALATTELLA wrote: I also do prefer 6TiSCH. Maria Rita From:6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 27, 2013 12:39 AM To: Xavier Vilajosana Guillen Cc: Pascal Thubert (pthubert); Prof. Diego Dujovne; 6tsch@ietf.org Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ? +1 to 6TiSCH. Qin On Tue, Aug 27, 2013 at 6:02 AM, Xavier Vilajosana Guillen > wrote: Hi all, I prefer 6TiSCH. :-) X On Mon, Aug 26, 2013 at 12:31 PM, Prof. Diego Dujovne > wro= te: Pascal, I agree with the 6LoTuS to include other TDMAs as long as the IETF accepts a wider scope. From the architecture point of view, I think other TDMAs should be supported by a 6top-like layer, in order to stay on top of the MAC layer. Regards, Diego Dujovne 2013/8/26 Pascal Thubert (pthubert) >: > Dear all; > > 6TiSCH is the winner of the Condorcet vote. > > There was a good point on the ML that we might extend our work in the fut= ure to other MACs that are still deterministic (based on TDM) but not neces= sarily channel hopping. > I wanted to take a very quick poll on the alternate name 6LoTuS that indi= cates the family trait with other low power activities ( the lo prefix) and= focusses on the Time Slotted aspect. > > If you really like the 6LoTuS name better (than 6TiSCH) please let us kno= w in the coming days. We really want to make the request by the end of thi= s week. > > Cheers, > > Pascal and Thomas > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_8F1D83ADCC1AC94186A867BEE9B7D91306D825E9PEXCVZYM13corpo_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hi all,

     = ;

    I haven= 217;t taken part in the naming discussion so far, for a reason.<= /span>

    I want to = express this reason here to let the group know of an opinion that has not b= een much expressed so far.
    This opinion is that I don’t care much for the name. I do understand = the danger of naming conflicts, I concur with the opinion that they should = be avoided as much as we can be aware of their risk of appearance, and this= seems to have been adequately addressed so far.
    Beyond that, I believe 6TiSCH or 6LoTS or 6LoTuS doesn’t make much of= a difference.

    This name = will be used by geeks to talk to geeks.

    If a comme= rcial product needs to refer to this work in the future, it will probably r= eference an RFC anyway, or even more likely marketing will invent a new shiny name that speaks to the public.

    Therefore,= in line with JP, I suggest at this point that the group chairs make a deci= sion and be done with it.

    By contras= t to JP, however, I believe this discussion has not prevented the work to s= tart anyway ;-)

    Cheers,

     = ;

    Dominique<= o:p>

     = ;

     = ;

    De : 6tsc= h-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] De la part de JP Vasseur (jvasseur)
    Envoy=E9 : mardi 27 ao=FBt 2013 11:04
    =C0 : Patrick Wetterwald (pwetterw); Pascal Thubert (pthubert)<= br> Cc : Maria Rita PALATTELLA; Alfredo Grieco; Prof. Diego Dujovne= ; Xavier Vilajosana Guillen; 6tsch@ietf.org; Qin Wang
    Objet : [6tsch] Urgent to close on name ? Re: 6TiSCH or not 6Ti= SCH ?

     

    Hi !

     

    If I may I'd rather close on the name (6LoTus seems great to me) and get the work start !

     

    Thanks.

     

    JP.

     

    On Aug 27, 2013, at 10:54 AM, Patrick Wetterwald (pw= etterw) <pwetterw@cisco.com>= ; wrote:



    ISH does not sound right for a working = group related to determinism.

     

    ISH in english is more similar to "= ;approximately, about, roughly". Is it really the message we want to c= arry? I don't think so.

     

    IMHO 6LoTus is more appropriate for a w= orking group name.

     

    Patrick

     

    From: Alfredo Grieco <alfredo.grieco@gmail.com>
    Date: Tuesday, August 27, 2013 10:39 AM
    To: Maria Rita PALATTELLA <maria-rita.palattella@uni.lu>
    Cc: "6tsch@ietf.org"= <6tsch@ietf.org>, Pascal THUBE= RT <pthubert@cisco.com>, &q= uot;Prof. Diego Dujovne" <diego.dujovne@mail.udp.cl>, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>, Qin Wang <qinwang@berkeley.edu>
    Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ?

     

    +1 for 6TiSCH. Ciao. Al

    On Tuesday, August 27, 2013, Maria Rita PALATTELLA wrote:

    I also do = prefer 6TiSCH.

     

    Maria Rita=

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 27, 2013 12:39 AM
    To: Xavier Vilajosana Guillen
    Cc: Pascal Thubert (pthubert); Prof. Diego Dujovne; 6tsch@ietf.org
    Subject: Re: [6tsch] 6TiSCH or not 6TiSCH ?

     =

    +1 to 6TiSCH.

     =

    Qin

     

    On Tue, Aug 27, 2013 at = 6:02 AM, Xavier Vilajosana Guillen <xvilajosana@e= ecs.berkeley.edu> wrote:

    Hi all, I prefer 6TiSCH.

    :-)

    X

     

    On Mon, Aug 26, 2013 at = 12:31 PM, Prof. Diego Dujovne <diego.dujovne@mail.udp= .cl> wrote:

    Pascal,
              I agree with the 6LoTuS to include other= TDMAs as long as the
    IETF accepts a wider scope. From the architecture point of view, I think
    other TDMAs should be supported by a 6top-like layer, in order to stay
    on top of the MAC layer.
              Regards,

                         = ;                Diego Dujovne

    2013/8/26 Pascal Thubert (pthubert) <pthubert@cisco.com&= gt;:

    > Dear all;
    >
    > 6TiSCH is the winner of the Condorcet vote.
    >
    > There was a good point on the ML that we might extend our work in the = future to other MACs that are still deterministic (based on TDM) but not ne= cessarily channel hopping.
    > I wanted to take a very quick poll on the alternate name 6LoTuS that i= ndicates the family trait with other low power activities ( the lo prefix) = and focusses on the Time Slotted aspect.
    >
    > If you really like the 6LoTuS name better (than 6TiSCH) please let us = know in the coming days.  We really want to make the request by the en= d of this week.
    >
    > Cheers,
    >
    > Pascal and Thomas
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org
    > https://www.ietf.org/mailman/listinfo/6tsch

    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.= udp.cl
    (56 2) 676 8125

    ________________________= _______________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     =


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     =

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    6tsch mailing list
    6tsch@ietf.org
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    --_000_8F1D83ADCC1AC94186A867BEE9B7D91306D825E9PEXCVZYM13corpo_-- From twatteyne@gmail.com Tue Aug 27 11:24:33 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ED3A121E8084 for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 11:24:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.845 X-Spam-Level: X-Spam-Status: No, score=-1.845 tagged_above=-999 required=5 tests=[AWL=0.132, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bLHWUO8D6pzu for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 11:24:33 -0700 (PDT) Received: from mail-pd0-x232.google.com (mail-pd0-x232.google.com [IPv6:2607:f8b0:400e:c02::232]) by ietfa.amsl.com (Postfix) with ESMTP id 2F85611E81D7 for <6tsch@ietf.org>; Tue, 27 Aug 2013 11:24:33 -0700 (PDT) Received: by mail-pd0-f178.google.com with SMTP id w10so5220339pde.37 for <6tsch@ietf.org>; Tue, 27 Aug 2013 11:24:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=1mYZ8R6K9X4XbGuyn9U8XsSJTdK6V3/EXrydgqWew5Q=; b=Xs/Task2tJVYvNM0nJs0TbH0PSjm/6eU1cTxayIISSwfUkIKM6UJYFbB7pa3C7zV4B WF9j5r3XmvzKS+YSiz+dZZLyPBAr/98MJ0VEXu4eaAtmjo0H+iOW14ztS5y3x0fQg8E9 WJzc62Qq9CVp3Uw5ajUCzuNnA+rpEKkt3LuAxA1fKT2A07hoYHsCP59T386nv09kiJ36 WvppWCJya70832w7QWy8ylscSHhg/uSuEaW6P169ZGT08PSqgZLL8L+DE7/BJd/Mbr/v fc6/TPKaJk8jLEUD7DGQi6nGvP16UktCTc/oiX/OWyJIPvHxeJzHgMKqnAbbTsoldI7+ Wp7Q== X-Received: by 10.66.248.161 with SMTP id yn1mr22622546pac.0.1377627872894; Tue, 27 Aug 2013 11:24:32 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 27 Aug 2013 11:24:12 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Tue, 27 Aug 2013 11:24:12 -0700 X-Google-Sender-Auth: SoDTMaijDz7JBh4l705sm_fEqDM Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b15b043ff26fe04e4f1fbca Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 18:24:34 -0000 --047d7b15b043ff26fe04e4f1fbca Content-Type: text/plain; charset=ISO-8859-1 Please correct me if I'm wrong: - Action Flow (ME->6top). ME asks 6top to execute some command. Typical commands are add/delete cells. - Query Flow (ME->6top). ME asks 6top for some information. Typical queries are about current cells usage or statistics. - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported information covers cells usage or statistics. Questions: - Looks like Query and Report flows contain the same information. In normal operation, the Report flow should be enough, the Query flow only being used in special cases, for example when the ME has lost state (just booted, bug, etc). Agreed? - The ME should be able to configure the report flow. Configuration could be "send report every X seconds" or "send report when variable X larger than Y". I imagine this could be done over the action flow? Agreed? - A node will want to report an urgent event to the ME. One such events is "the topology appears to have changed". There any many cases where this information needs to be sent immediately, i.e. no time to wait for the next report cycle. We can consider this to be an asynchronous report, or part of a new "Event" flow. - Same for the mote asking the ME for a schedule update. Thoughts? Thomas On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang wrote: > Xavi, > > Approach-(2) is more flexible and likely covers more situations. But, it > may bring some complexity to 6top, because 6top has to make decision on the > bandwidth request (add/delete), which needs some metrics, some > intelligence. > > What do you think? > > Qin > > > > On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote: > >> Hi Qin, I like your (2). >> >> Note also that there are situations that might have some differences. >> >> 1-the track already exists. >> 2-the track between the two entities does not exists >> >> in either case I think that the node that requires certain BW to another >> node should talk to 6top, which processes that request and sends a request >> to the ME, the ME installs that new track. >> >> does it make sense. Do you see any drawback on that approach? >> >> X >> >> >> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang wrote: >> >>> Hi all, >>> >>> During today's call, we presented three control flows between Management >>> Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Report Flow, and >>> started to talk about the 4th control flow. The thread will continue the >>> discussion about 4th flow. >>> >>> Here is the scenario: when a node finds that more cells are needed, e.g. >>> nodes wants to send 10pkt/s report at some time, it should be able to ask >>> ME to install more bandwidth. >>> >>> I can see two approaches: >>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRate >>> is a attribute in 6top. Then, ME can get the information via Query Flow or >>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth Request >>> to ME, and then ME install more bandwidth. This is the 4th control flow. >>> >>> What do you think? Which one makes more sense? >>> >>> Qin >>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b15b043ff26fe04e4f1fbca Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable     --
    Thomas Watteyne, Ph= . D
    Sr. Networking Design Engineer
    Dust Networks / Line= ar Technology
    30695 Huntwood Ave
    Hayward, CA 94544-7021
    +1 (510) 400-2978

    This e-mail transmission, and any documents, files or previous e-ma= il messages attached to it may contain confidential information that is leg= ally privileged. If you are not the intended recipient, or a person respons= ible for delivering it to the intended recipient, you are hereby notified t= hat any disclosure, copying, distribution or use of any of the information = contained in or attached to this transmission is STRICTLY PROHIBITED. If yo= u have received this transmission in error, please immediately notify me by= reply e-mail, or by telephone at (510) 400-2978, and destroy the original = transmission and its attachments without reading or saving in any manner. T= hank you.
    Please correct me if I'm wrong:
    -=A0Action Flow (ME->6top). ME asks 6top t= o execute some command. Typical commands are add/delete cells.
    -=A0Query Flow= =A0(ME->6top). ME asks 6top for some information. Typical queries are ab= out current cells usage or statistics.
    -=A0Report Flow=A0(6top->ME). 6top tell ME how it is doing. Typical repo= rted information covers=A0cells usage or statistics.

    Questions:
    = - Looks like Query and Report flows contain the same information. In normal= operation, the Report flow should be enough, the Query flow only being use= d in special cases, for example when the ME has lost state (just booted, bu= g, etc). Agreed?
    - The ME s= hould be able to configure the report flow. Configuration could be "se= nd report every X seconds" or "send report when variable X larger= than Y". I imagine this could be done over the action flow? Agreed?
    - A node will want to report an urgent event to the ME. On= e such events is "the topology appears to have changed". There an= y many cases where this=A0information=A0needs to be sent immediately, i.e. = no time to wait for the next report cycle. We can consider this to be an as= ynchronous report, or part of a new "Event" flow.
    - Same for the mote asking the ME for a schedule update.

    Thoughts?

    Thomas

    On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Xavi,

    Ap= proach-(2) is more flexible and likely covers more situations. But, it may = bring some complexity to 6top, because 6top has to make decision on the ban= dwidth request (add/delete), which needs some metrics, some intelligence.= =A0

    What do you think?

    Qin

    <= /div>

    On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu> wrote= :
    Hi Qin, I li= ke your (2).
    =A0
    Note also that there are situation= s that might have some differences.

    1-the track already exists.
    2-the track betwee= n the two entities does not exists

    in either case I think that the node that requires certain BW to = another node should talk to 6top, which processes that request and sends a = request to the ME, the ME installs that new track.

    does it mak= e sense. Do you see any drawback on that approach?

    X


    On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang &= lt;qinwang@berkel= ey.edu> wrote:
    Hi al= l,

    During today's call, we presented three control f= lows between Management Entity (ME) and 6top, i.e. Action Flow, Query Flow,= and Report Flow, and started to talk about the 4th control flow. The threa= d will continue the discussion about 4th flow.

    Here is the scenario: when a node finds that more cells= are needed, e.g. nodes wants to send 10pkt/s report at some time, it shoul= d be able to ask ME to install more bandwidth.=A0

    I can see two approaches:
    (1) Managed by ME, without 4th Control = Flow. Assume BandwidthUsageRate is a attribute in 6top. Then, ME can get th= e information via Query Flow or Report Flow, and adjust the bandwidth of th= e node via Action Flow.=A0
    (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth= Request to ME, and then ME install more bandwidth. This is the 4th control= flow.

    What do you think? Which one makes more= sense?

    Qin
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch




    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --047d7b15b043ff26fe04e4f1fbca-- From twatteyne@gmail.com Tue Aug 27 11:27:10 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B02E011E81DA for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 11:27:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.852 X-Spam-Level: X-Spam-Status: No, score=-1.852 tagged_above=-999 required=5 tests=[AWL=0.125, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 96BZCH2y33nu for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 11:27:09 -0700 (PDT) Received: from mail-pb0-x234.google.com (mail-pb0-x234.google.com [IPv6:2607:f8b0:400e:c01::234]) by ietfa.amsl.com (Postfix) with ESMTP id C008411E81D5 for <6tsch@ietf.org>; Tue, 27 Aug 2013 11:27:09 -0700 (PDT) Received: by mail-pb0-f52.google.com with SMTP id wz12so5143519pbc.25 for <6tsch@ietf.org>; Tue, 27 Aug 2013 11:27:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=+9gOM5MPkDTcwRBtWUtkQaqhSLaTmhG8jw0Y/uLZ40c=; b=c0soGbGXjgSnFdcLFR89x00k9A0QmHEKf8yqBmGCgmmYXdzmaYFmEIhVTY81puyuFv fvwYhcuLd6bcQqB1z4UlFlaEfAhhEeq9ziPco+ErTh7bRgg1Ygj54T0Lwqhudkn507i0 12j9UOgV4T+pFLomRO1U5N1sl7QAjIdss9y7TL/e6iWgfngFtbyZ1oJD+M/+EtwlZ13w k8qD1/GN+hxkPru45ATPyk4h40JuMronzWszt3iCSGf+tGcHwX4j7hW4Y22LUkER7UvT 90gzlRH08IbjAQFywzTeQ4BuzcPDo2LD3N0rsaM1+TitKQHv3yV7eUyPXy0TWTbV97rx NSpg== X-Received: by 10.68.186.193 with SMTP id fm1mr10512310pbc.163.1377628029477; Tue, 27 Aug 2013 11:27:09 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Tue, 27 Aug 2013 11:26:49 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Tue, 27 Aug 2013 11:26:49 -0700 X-Google-Sender-Auth: BjpE0cbeqkqshrSVLX9Jlb5-A2Q Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7bd764b254718404e4f20597 Subject: Re: [6tsch] format of management message X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 18:27:10 -0000 --047d7bd764b254718404e4f20597 Content-Type: text/plain; charset=ISO-8859-1 Qin, Very much along the same line here. The scope of work item 1 from https://bitbucket.org/6tsch/charter-ietf-6tsch/src/ is the format of the data that is exchanged, i.e. what you would see if you started Wireshark. I don't believe we are making any assumption on the way the data is stored inside the devices. I believe it is safe to assume that this is implementation-specific and out of scope. Thomas On Mon, Aug 26, 2013 at 3:56 PM, Xavier Vilajosana Guillen < xvilajosana@eecs.berkeley.edu> wrote: > Hi Qin, > > I see it like you indicate at (1). The format and encoding is only used in > the payload of exchanged messages. > > as regards to (2) > - 1) Computational complexity is a limiting factor if we want to be able > to run in 8bit uC. So this is important. > - 2) Compact data size. This can be easily experimented as soon as we have > some formats defined. > - 3) I don't think the tool is a problem as most of this formats have a > tool. > > (3) I know about EXI (Efficeint XML) which compares to ASN.1. I am not an > expert of that and I do not know if BSON or CBOR perform better but it > might be another candidate. > > X > > > On Mon, Aug 26, 2013 at 3:38 PM, Qin Wang wrote: > >> Dear All, >> >> According to last Friday's call, we start the thread to discuss the >> format of management message. >> >> Background: >> The management messages are exchanged between a Management Entity (ME) >> and 6top, and the ME can be existing in PCE or upper layer of 6top. In some >> other threads, we have been discussing about the control flows and the >> content of control flows, which can be used as reference. >> >> Consideration: >> (1) Where the format will be used? IMHO, the format, which we are talking >> about, is only used to express the exchanged messages, it should not be >> used in storage like MIB. Thus, Compacting is a process of translating the >> data in storage format to the data in message format, and De-compacting is >> a reverse process. Make sense? >> >> (2) Criteria of evaluation. >> -- Compact data size >> -- Computational complexity of Compacting/De-compacting >> -- tool is existing or not >> -- .... more? >> >> (3) Candidates: CBOR, JSON, BSON, and ...... >> >> Any comments and suggestions are welcome. >> >> Thanks >> Qin >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch --047d7bd764b254718404e4f20597 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Qin,

    Very much along the same line here= . The scope of work item 1 from=A0https://bitbucket.org/6tsch/charte= r-ietf-6tsch/src/=A0is the format of the data that is exchanged, i.e. w= hat you would see if you started Wireshark. I don't believe we are maki= ng any assumption on the way the data is stored inside the devices. I belie= ve it is safe to assume that this is implementation-specific and out of sco= pe.

    Thomas

    On Mon, Aug 26, 2013 at 3:56 PM, Xavier Vilajosana Guillen= <xvilajosana@eecs.berkeley.edu> wrote:
    Hi Qin,

    I see it like you indicate at (1). The format and encoding is only used= in the payload of exchanged messages.

    as regards to (2)
    - 1) Computational complexi= ty is a limiting factor if we want to be able to run in 8bit uC. So this is= important.
    - 2) Compact data size. This can be easily experimented as soon = as we have some formats defined.
    - 3) I don't think the = tool is a problem as most of this formats have a tool.

    (3) I know about EXI (Efficeint XML) which compares to ASN.1. I am not an e= xpert of that and I do not know if BSON or CBOR perform better but it might= be another candidate.

    X


    On Mon, Aug 26, 2013 at 3:38 P= M, Qin Wang <qinwang@berkeley.edu> wrote:
    Dear All,

    According to last Friday'= s call, we start the thread to discuss the format of management message.=A0=

    Background:
    The management messages are= exchanged between a Management Entity (ME) and 6top, and the ME can be exi= sting in PCE or upper layer of 6top. In some other threads, we have been di= scussing about the control flows and the content of control flows, which ca= n be used as reference.

    Consideration:
    (1) Where the format will be u= sed? IMHO, the format, which we are talking about, is only used to express = the exchanged messages, it should not be used in storage like MIB. Thus, Co= mpacting is a process of translating the data in storage format to the data= in message format, and De-compacting is a reverse process. Make sense?
    =A0=A0
    (2) Criteria of evaluation.=A0
    =A0 =A0 -- C= ompact data size
    =A0 =A0 -- Computational complexity of Compactin= g/De-compacting
    =A0 =A0 -- tool is existing or not
    =A0 = =A0 -- .... more?

    (3) Candidates: CBOR, JSON, BSON, and ......
    = =A0
    Any comments and suggestions are welcome.

    Thanks
    Qin

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
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    --047d7bd764b254718404e4f20597-- From qinwang@berkeley.edu Tue Aug 27 14:09:51 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1B92211E81FB for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 14:09:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.914 X-Spam-Level: X-Spam-Status: No, score=-2.914 tagged_above=-999 required=5 tests=[AWL=0.062, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qvCuVZKJKMiT for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 14:09:46 -0700 (PDT) Received: from mail-vc0-f176.google.com (mail-vc0-f176.google.com [209.85.220.176]) by ietfa.amsl.com (Postfix) with ESMTP id 6F97F11E81D0 for <6tsch@ietf.org>; Tue, 27 Aug 2013 14:09:46 -0700 (PDT) Received: by mail-vc0-f176.google.com with SMTP id ha11so3388460vcb.21 for <6tsch@ietf.org>; Tue, 27 Aug 2013 14:09:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=4q2vHWZQusoES8iRaX8sToMo2+eyfOWiQx2g4uDBJmA=; b=IlRRUOUe0v4VvRTHM511M9MZK9wxsLWh3S2kGjU253FCPHg0NtUJjW6/aL/1zuaQBq 8dK8QMRQyo5oj+g7CtjCo0638j+In4vXl8fe2yFTGv1wyJMW6Btoca/IRk1Nrz02yKys V7J2tmgsZfhcTcBRdTqktdK9Y/8CyMwP4T977IirxchtZDRiDvw8Praf9MvYWj0LWbKp W+Y07qQiuiiYiwwKIGmRKr/kpHVkWAkvgYJ3g/RNiTOQa7FWxRJzIKt2UFCqhMEktort OUzFk5BkkJAjOK30gNtHZx2ctM+EHVvoXMJCpPPhyCMp+6Fxhnngw3/mysoJ1bY7vKS3 YGTQ== X-Gm-Message-State: ALoCoQl0DWGZ7G6SnNMXa0Bm0cQ1S0mgCf4+/XR9qO3ekUtnHbcSzDmJ+U/C6hp+8Bneddh0exG0 MIME-Version: 1.0 X-Received: by 10.220.97.145 with SMTP id l17mr1864132vcn.35.1377637784811; Tue, 27 Aug 2013 14:09:44 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Tue, 27 Aug 2013 14:09:44 -0700 (PDT) In-Reply-To: References: Date: Wed, 28 Aug 2013 05:09:44 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=001a11c1dd02cb312704e4f44ada Cc: "6tsch@ietf.org" <6tsch@ietf.org>, Xavier Vilajosana Guillen Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 21:09:51 -0000 --001a11c1dd02cb312704e4f44ada Content-Type: text/plain; charset=ISO-8859-1 Thomas, I agree with almost all. Only some comments on "Report Flow". As you mentioned, there are two kinds of report scenarios, one is periodically report, another one is burst report or called as event-driven report. I have no question on how periodically report works, which you described. But I'm not sure what the best way to handle event-driven report is. I think we don't want to assume 6top sublayer is very intelligent, in another word, the events and the trigger of events should be configured by ME, just like the interval of periodically report. Make sense? If you agree to it, the remained issue is when and how the bandwidth for sending event-driven reports is reserved. Here are two ways I can see. (1) when a event is triggered, node sends a request to ME and ask some BW to send the report. I believe that is how the 4th control flow works. (2) when ME configure the events and their triggers, ME also provisions some BW for the node which allows the node to send the report triggered by some event. I have no strong opinion on which one is better. But, the bottom line is the configuration of the set of events and their triggers should be out of 6top scope. Thought? Thanks Qin On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne wrote: > Qin, > > Please correct me if I'm wrong: > - Action Flow (ME->6top). ME asks 6top to execute some command. Typical > commands are add/delete cells. > - Query Flow (ME->6top). ME asks 6top for some information. Typical > queries are about current cells usage or statistics. > - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported > information covers cells usage or statistics. > > Questions: > - Looks like Query and Report flows contain the same information. In > normal operation, the Report flow should be enough, the Query flow only > being used in special cases, for example when the ME has lost state (just > booted, bug, etc). Agreed? > - The ME should be able to configure the report flow. Configuration could > be "send report every X seconds" or "send report when variable X larger > than Y". I imagine this could be done over the action flow? Agreed? > - A node will want to report an urgent event to the ME. One such events is > "the topology appears to have changed". There any many cases where > this information needs to be sent immediately, i.e. no time to wait for the > next report cycle. We can consider this to be an asynchronous report, or > part of a new "Event" flow. > - Same for the mote asking the ME for a schedule update. > > Thoughts? > > Thomas > > > > On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang wrote: > >> Xavi, >> >> Approach-(2) is more flexible and likely covers more situations. But, it >> may bring some complexity to 6top, because 6top has to make decision on the >> bandwidth request (add/delete), which needs some metrics, some >> intelligence. >> >> What do you think? >> >> Qin >> >> >> >> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen < >> xvilajosana@eecs.berkeley.edu> wrote: >> >>> Hi Qin, I like your (2). >>> >>> Note also that there are situations that might have some differences. >>> >>> 1-the track already exists. >>> 2-the track between the two entities does not exists >>> >>> in either case I think that the node that requires certain BW to another >>> node should talk to 6top, which processes that request and sends a request >>> to the ME, the ME installs that new track. >>> >>> does it make sense. Do you see any drawback on that approach? >>> >>> X >>> >>> >>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang wrote: >>> >>>> Hi all, >>>> >>>> During today's call, we presented three control flows between >>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Report >>>> Flow, and started to talk about the 4th control flow. The thread will >>>> continue the discussion about 4th flow. >>>> >>>> Here is the scenario: when a node finds that more cells are needed, >>>> e.g. nodes wants to send 10pkt/s report at some time, it should be able to >>>> ask ME to install more bandwidth. >>>> >>>> I can see two approaches: >>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRate >>>> is a attribute in 6top. Then, ME can get the information via Query Flow or >>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>> Request to ME, and then ME install more bandwidth. This is the 4th control >>>> flow. >>>> >>>> What do you think? Which one makes more sense? >>>> >>>> Qin >>>> >>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>>> >>> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > > -- > Thomas Watteyne, Ph. D > Sr. Networking Design Engineer > Dust Networks / Linear Technology > 30695 Huntwood Ave > Hayward, CA 94544-7021 > +1 (510) 400-2978 > twatteyne@linear.com > > This e-mail transmission, and any documents, files or previous e-mail > messages attached to it may contain confidential information that is > legally privileged. If you are not the intended recipient, or a person > responsible for delivering it to the intended recipient, you are hereby > notified that any disclosure, copying, distribution or use of any of the > information contained in or attached to this transmission is STRICTLY > PROHIBITED. If you have received this transmission in error, please > immediately notify me by reply e-mail, or by telephone at (510) 400-2978, > and destroy the original transmission and its attachments without reading > or saving in any manner. Thank you. > --001a11c1dd02cb312704e4f44ada Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Thomas,

    I agree with almost all. Only s= ome comments on "Report Flow".=A0

    As you= mentioned, there are two kinds of report scenarios, one is periodically re= port, another one is burst report or called as event-driven report. I have = no question on how periodically report works, which you described. But I= 9;m not sure what the best way to handle event-driven report is. I think we= don't want to assume 6top sublayer is very intelligent, in another wor= d, the events and the trigger of events should be configured by ME, just li= ke the interval of periodically report. Make sense?=A0

    If you agree to it, the remained issue is =A0when and h= ow the bandwidth for sending event-driven reports is reserved. Here are two= ways I can see.
    (1) when a event is triggered, node sends a requ= est to ME and ask some BW to send the report. I believe that is how the 4th= control flow works.
    (2) when ME configure the events and their triggers, ME also provision= s some BW for the node which allows the node to send the report triggered b= y some event.

    I have no strong opinion on which on= e is better. But, the bottom line is the configuration of the set of events= and their triggers should be out of 6top scope. Thought?

    Thanks
    Qin






    On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com> wrote:
    Qin,

    Ple= ase correct me if I'm wrong:
    -=A0Action Flow (ME->6top). ME asks 6top to = execute some command. Typical commands are add/delete cells.
    -=A0Query Flow=A0(ME->6top). ME= asks 6top for some information. Typical queries are about current cells us= age or statistics.
    -=A0Report Flow=A0<= span style=3D"font-size:13px;font-family:arial,sans-serif">(6top->ME). 6= top tell ME how it is doing. Typical reported information covers=A0<= span style=3D"font-family:arial,sans-serif;font-size:13px">cells usage or s= tatistics.

    Que= stions:
    - Looks like Query and Report flows contain the same information.= In normal operation, the Report flow should be enough, the Query flow only= being used in special cases, for example when the ME has lost state (just = booted, bug, etc). Agreed?
    - Th= e ME should be able to configure the report flow. Configuration could be &q= uot;send report every X seconds" or "send report when variable X = larger than Y". I imagine this could be done over the action flow? Agr= eed?
    - A node will want to report an urgen= t event to the ME. One such events is "the topology appears to have ch= anged". There any many cases where this=A0information=A0needs to be se= nt immediately, i.e. no time to wait for the next report cycle. We can cons= ider this to be an asynchronous report, or part of a new "Event" = flow.
    - Same for the mote asking the ME for= a schedule update.

    <= /font>
    Thoughts?

    Thomas



    On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinw= ang@berkeley.edu> wrote:
    Xavi,

    Ap= proach-(2) is more flexible and likely covers more situations. But, it may = bring some complexity to 6top, because 6top has to make decision on the ban= dwidth request (add/delete), which needs some metrics, some intelligence.= =A0

    What do you think?
    <= div>
    Qin



    On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosa= na Guillen <xvilajosana@eecs.berkeley.edu> wrote= :
    Hi Qin, I li= ke your (2).
    =A0
    Note also that there are situation= s that might have some differences.

    1-the track already exists.
    2-the track betwee= n the two entities does not exists

    in either case I think that the node that requires certain BW to = another node should talk to 6top, which processes that request and sends a = request to the ME, the ME installs that new track.

    does it mak= e sense. Do you see any drawback on that approach?

    X


    On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang &= lt;qinwang@berkel= ey.edu> wrote:
    Hi al= l,

    During today's call, we presented three control f= lows between Management Entity (ME) and 6top, i.e. Action Flow, Query Flow,= and Report Flow, and started to talk about the 4th control flow. The threa= d will continue the discussion about 4th flow.

    Here is the scenario: when a node finds that more cells= are needed, e.g. nodes wants to send 10pkt/s report at some time, it shoul= d be able to ask ME to install more bandwidth.=A0

    I can see two approaches:
    (1) Managed by ME, without 4th Control = Flow. Assume BandwidthUsageRate is a attribute in 6top. Then, ME can get th= e information via Query Flow or Report Flow, and adjust the bandwidth of th= e node via Action Flow.=A0
    (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth= Request to ME, and then ME install more bandwidth. This is the 4th control= flow.

    What do you think? Which one makes more= sense?

    Qin
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch




    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch





    --001a11c1dd02cb312704e4f44ada-- From diego.dujovne@mail.udp.cl Tue Aug 27 14:29:10 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 127F111E8338 for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 14:29:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4v+1UyL0MwYL for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 14:29:06 -0700 (PDT) Received: from mail-wg0-f43.google.com (mail-wg0-f43.google.com [74.125.82.43]) by ietfa.amsl.com (Postfix) with ESMTP id 8B0A521E80A3 for <6tsch@ietf.org>; Tue, 27 Aug 2013 14:29:05 -0700 (PDT) Received: by mail-wg0-f43.google.com with SMTP id z11so2275752wgg.34 for <6tsch@ietf.org>; Tue, 27 Aug 2013 14:29:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=0ld63iZrtv2SYtVIOMxnX53VXdgw1yd1zDQklDi9pKs=; b=p3zM6SygB76ODfa1kEaUTC2PPNaQHs0sHyy0PD8ftpDONVBJoadn6X3p32MuEjjGqT EKqwKTTO9aMQdrVajBPuBJ/C+io64BztJPzTGRn4So18jDwstmA1u7NNZgrMfQl60rGR gEHPuKHnykdvdhzPhKb7mBk4zAMyH76LeXWHj6SozSkNY9lJeYrSPJjvoCiDoJBVQ9vG bCgiqjGKv8mumePRi+Q1KQUBDXquMIPS0kAphLqqBJ40LMk+QAttObHHxFAg5yYMjYTZ OLuECF7hZYlAmenlw7CA3YrEaPT5qzavAX8Hhl6Wln9xuZg0C5vIshWLAYAHMPejk+Yv aZEw== X-Gm-Message-State: ALoCoQlLifmC6bV/TB1caYzhvWmHye6BUJn4glQ5/UKHpz/f/SdIdOa7ZIO2y1SjGoxk94Zy5dR2 MIME-Version: 1.0 X-Received: by 10.180.188.132 with SMTP id ga4mr13074281wic.53.1377638941458; Tue, 27 Aug 2013 14:29:01 -0700 (PDT) Received: by 10.194.122.103 with HTTP; Tue, 27 Aug 2013 14:29:01 -0700 (PDT) In-Reply-To: References: Date: Tue, 27 Aug 2013 17:29:01 -0400 Message-ID: From: "Prof. Diego Dujovne" To: Qin Wang Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, Xavier Vilajosana Guillen Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 21:29:10 -0000 Qin, Thomas, Alternative (1) adds delay to define the slots to send the event to the ME (propagate the new schedule), while alternative (2) keeps reserved slots waiting for the event to happen= . I think both alternatives should be included, and configured by the ME depe= nding on the network requirements. More thoughts? Diego Dujovne 2013/8/27 Qin Wang : > Thomas, > > I agree with almost all. Only some comments on "Report Flow". > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-drive= n > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven repo= rt > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured b= y > ME, just like the interval of periodically report. Make sense? > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see. > (1) when a event is triggered, node sends a request to ME and ask some BW= to > send the report. I believe that is how the 4th control flow works. > (2) when ME configure the events and their triggers, ME also provisions s= ome > BW for the node which allows the node to send the report triggered by som= e > event. > > I have no strong opinion on which one is better. But, the bottom line is = the > configuration of the set of events and their triggers should be out of 6t= op > scope. Thought? > > Thanks > Qin > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > wrote: >> >> Qin, >> >> Please correct me if I'm wrong: >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typical >> commands are add/delete cells. >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> queries are about current cells usage or statistics. >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported >> information covers cells usage or statistics. >> >> Questions: >> - Looks like Query and Report flows contain the same information. In >> normal operation, the Report flow should be enough, the Query flow only >> being used in special cases, for example when the ME has lost state (jus= t >> booted, bug, etc). Agreed? >> - The ME should be able to configure the report flow. Configuration coul= d >> be "send report every X seconds" or "send report when variable X larger = than >> Y". I imagine this could be done over the action flow? Agreed? >> - A node will want to report an urgent event to the ME. One such events = is >> "the topology appears to have changed". There any many cases where this >> information needs to be sent immediately, i.e. no time to wait for the n= ext >> report cycle. We can consider this to be an asynchronous report, or part= of >> a new "Event" flow. >> - Same for the mote asking the ME for a schedule update. >> >> Thoughts? >> >> Thomas >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang wrote: >>> >>> Xavi, >>> >>> Approach-(2) is more flexible and likely covers more situations. But, i= t >>> may bring some complexity to 6top, because 6top has to make decision on= the >>> bandwidth request (add/delete), which needs some metrics, some intellig= ence. >>> >>> What do you think? >>> >>> Qin >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> wrote: >>>> >>>> Hi Qin, I like your (2). >>>> >>>> Note also that there are situations that might have some differences. >>>> >>>> 1-the track already exists. >>>> 2-the track between the two entities does not exists >>>> >>>> in either case I think that the node that requires certain BW to anoth= er >>>> node should talk to 6top, which processes that request and sends a req= uest >>>> to the ME, the ME installs that new track. >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> X >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang wrot= e: >>>>> >>>>> Hi all, >>>>> >>>>> During today's call, we presented three control flows between >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Re= port >>>>> Flow, and started to talk about the 4th control flow. The thread will >>>>> continue the discussion about 4th flow. >>>>> >>>>> Here is the scenario: when a node finds that more cells are needed, >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be ab= le to >>>>> ask ME to install more bandwidth. >>>>> >>>>> I can see two approaches: >>>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRat= e >>>>> is a attribute in 6top. Then, ME can get the information via Query Fl= ow or >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>>> Request to ME, and then ME install more bandwidth. This is the 4th co= ntrol >>>>> flow. >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> >> -- >> Thomas Watteyne, Ph. D >> Sr. Networking Design Engineer >> Dust Networks / Linear Technology >> 30695 Huntwood Ave >> Hayward, CA 94544-7021 >> +1 (510) 400-2978 >> twatteyne@linear.com >> >> This e-mail transmission, and any documents, files or previous e-mail >> messages attached to it may contain confidential information that is leg= ally >> privileged. If you are not the intended recipient, or a person responsib= le >> for delivering it to the intended recipient, you are hereby notified tha= t >> any disclosure, copying, distribution or use of any of the information >> contained in or attached to this transmission is STRICTLY PROHIBITED. If= you >> have received this transmission in error, please immediately notify me b= y >> reply e-mail, or by telephone at (510) 400-2978, and destroy the origina= l >> transmission and its attachments without reading or saving in any manner= . >> Thank you. > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > --=20 DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 From P.Zand@utwente.nl Tue Aug 27 14:48:15 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 75AE511E8227 for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 14:48:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.311 X-Spam-Level: X-Spam-Status: No, score=-0.311 tagged_above=-999 required=5 tests=[AWL=0.192, BAYES_00=-2.599, HELO_EQ_NL=0.55, HOST_EQ_NL=1.545, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ck8f4F6m8fC2 for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 14:48:10 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 8834D21E80F9 for <6tsch@ietf.org>; Tue, 27 Aug 2013 14:48:06 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Tue, 27 Aug 2013 23:48:02 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Tue, 27 Aug 2013 23:48:00 +0200 From: To: , Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOo2nAsO9O/ZQFeUKjAh22FTro+JmpkCQQ Date: Tue, 27 Aug 2013 21:48:00 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA75FD5@EXMBX23.ad.utwente.nl> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA75FD5EXMBX23adutwent_" MIME-Version: 1.0 Cc: 6tsch@ietf.org, xvilajosana@eecs.berkeley.edu Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 21:48:15 -0000 --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA75FD5EXMBX23adutwent_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Qin, Thomas, Let me enter to your discussion. First, let me see if I am on the same track. Does ME mean the Management En= tity to send management flows to the PCE (in centralized approach) and to S= ignaling protocol or higher layers (in distributed approach). Am I right? I completely agree with Qin description. Regarding to two specified ways (by Qin) to ask bandwidth for sending event= -driven reports, I think way (2) makes more sense. Because the events shoul= d be send through the multi-hop path (track), toward the network manager (i= .e. PCE). Am I right? For sure, way (1) takes more time to reserve potentia= l resources (either in a distributed or centralized manner) for delivering = those events toward the final destination (i.e. PCE). By considering way (2= ), the PCE or higher layers can reserve some shared cells or extra dedicate= d cells beforehand, for delivering potential event, from node A toward the = final destination (i.e. PCE) along the track. Am I missing anything? Best Wishes, Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Q= in Wang Sent: Tuesday, August 27, 2013 11:10 PM To: Thomas Watteyne Cc: 6tsch@ietf.org; Xavier Vilajosana Guillen Subject: Re: [6tsch] the 4th control flow Thomas, I agree with almost all. Only some comments on "Report Flow". As you mentioned, there are two kinds of report scenarios, one is periodica= lly report, another one is burst report or called as event-driven report. I= have no question on how periodically report works, which you described. Bu= t I'm not sure what the best way to handle event-driven report is. I think = we don't want to assume 6top sublayer is very intelligent, in another word,= the events and the trigger of events should be configured by ME, just like= the interval of periodically report. Make sense? If you agree to it, the remained issue is when and how the bandwidth for s= ending event-driven reports is reserved. Here are two ways I can see. (1) when a event is triggered, node sends a request to ME and ask some BW t= o send the report. I believe that is how the 4th control flow works. (2) when ME configure the events and their triggers, ME also provisions som= e BW for the node which allows the node to send the report triggered by som= e event. I have no strong opinion on which one is better. But, the bottom line is th= e configuration of the set of events and their triggers should be out of 6t= op scope. Thought? Thanks Qin On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > wrote: Qin, Please correct me if I'm wrong: - Action Flow (ME->6top). ME asks 6top to execute some command. Typical com= mands are add/delete cells. - Query Flow (ME->6top). ME asks 6top for some information. Typical queries= are about current cells usage or statistics. - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported in= formation covers cells usage or statistics. Questions: - Looks like Query and Report flows contain the same information. In normal= operation, the Report flow should be enough, the Query flow only being use= d in special cases, for example when the ME has lost state (just booted, bu= g, etc). Agreed? - The ME should be able to configure the report flow. Configuration could b= e "send report every X seconds" or "send report when variable X larger than= Y". I imagine this could be done over the action flow? Agreed? - A node will want to report an urgent event to the ME. One such events is = "the topology appears to have changed". There any many cases where this inf= ormation needs to be sent immediately, i.e. no time to wait for the next re= port cycle. We can consider this to be an asynchronous report, or part of a= new "Event" flow. - Same for the mote asking the ME for a schedule update. Thoughts? Thomas On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: Xavi, Approach-(2) is more flexible and likely covers more situations. But, it ma= y bring some complexity to 6top, because 6top has to make decision on the b= andwidth request (add/delete), which needs some metrics, some intelligence. What do you think? Qin On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen > wrote: Hi Qin, I like your (2). Note also that there are situations that might have some differences. 1-the track already exists. 2-the track between the two entities does not exists in either case I think that the node that requires certain BW to another no= de should talk to 6top, which processes that request and sends a request to= the ME, the ME installs that new track. does it make sense. Do you see any drawback on that approach? X On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: Hi all, During today's call, we presented three control flows between Management En= tity (ME) and 6top, i.e. Action Flow, Query Flow, and Report Flow, and star= ted to talk about the 4th control flow. The thread will continue the discus= sion about 4th flow. Here is the scenario: when a node finds that more cells are needed, e.g. no= des wants to send 10pkt/s report at some time, it should be able to ask ME = to install more bandwidth. I can see two approaches: (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRate is a= attribute in 6top. Then, ME can get the information via Query Flow or Repo= rt Flow, and adjust the bandwidth of the node via Action Flow. (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth Request to= ME, and then ME install more bandwidth. This is the 4th control flow. What do you think? Which one makes more sense? Qin _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch -- Thomas Watteyne, Ph. D Sr. Networking Design Engineer Dust Networks / Linear Technology 30695 Huntwood Ave Hayward, CA 94544-7021 +1 (510) 400-2978 twatteyne@linear.com This e-mail transmission, and any documents, files or previous e-mail messa= ges attached to it may contain confidential information that is legally pri= vileged. If you are not the intended recipient, or a person responsible for= delivering it to the intended recipient, you are hereby notified that any = disclosure, copying, distribution or use of any of the information containe= d in or attached to this transmission is STRICTLY PROHIBITED. If you have r= eceived this transmission in error, please immediately notify me by reply e= -mail, or by telephone at (510) 400-2978, and destroy the original transmis= sion and its attachments without reading or saving in any manner. Thank you= . --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA75FD5EXMBX23adutwent_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Qin, Thomas,

    Let me enter to your disc= ussion.

     <= /p>

    First, let me see if I am= on the same track. Does ME mean the Management Entity to send management f= lows to the PCE (in centralized approach) and to Signaling protocol or higher layers (in distributed approach). Am I right?

    I completely agree with Q= in description.

    Regarding to two specifie= d ways (by Qin) to ask bandwidth for sending event-driven reports, I think = way (2) makes more sense. Because the events should be send through the multi-hop path (track), toward the network manager (i.e= . PCE). Am I right? For sure, way (1) takes more time to reserve potential = resources (either in a distributed or centralized manner) for delivering th= ose events toward the final destination (i.e. PCE). By considering way (2), the PCE or higher layers can reserve s= ome shared cells or extra dedicated cells beforehand, for delivering potent= ial event, from node A toward the final destination (i.e. PCE) along the tr= ack.

    Am I missing anything?

     <= /p>

    Best Wishes,

    Pouria    =  

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 27, 2013 11:10 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.org; Xavier Vilajosana Guillen
    Subject: Re: [6tsch] the 4th control flow

     

    Thomas,

     

    I agree with almost all. Only some comments on "= ;Report Flow". 

     

    As you mentioned, there are two kinds of report scen= arios, one is periodically report, another one is burst report or called as= event-driven report. I have no question on how periodically report works, = which you described. But I'm not sure what the best way to handle event-driven report is. I think we don't want = to assume 6top sublayer is very intelligent, in another word, the events an= d the trigger of events should be configured by ME, just like the interval = of periodically report. Make sense? 

     

    If you agree to it, the remained issue is  when= and how the bandwidth for sending event-driven reports is reserved. Here a= re two ways I can see.

    (1) when a event is triggered, node sends a request = to ME and ask some BW to send the report. I believe that is how the 4th con= trol flow works.

    (2) when ME configure the events and their triggers,= ME also provisions some BW for the node which allows the node to send the = report triggered by some event.

     

    I have no strong opinion on which one is better. But= , the bottom line is the configuration of the set of events and their trigg= ers should be out of 6top scope. Thought?

     

    Thanks

    Qin

     

     

     

     

     

    On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <= ;twatteyne@linear= .com> wrote:

    Qin,

     

    Please correct me if I'm wrong:

    - Action Flow (ME->6top). ME asks= 6top to execute some command. Typical commands are add/delete cells.

    - Query Flow (ME->6top). ME = asks 6top for some information. Typical queries are about current cells usa= ge or statistics.

    - Report Flow (6top->ME). 6t= op tell ME how it is doing. Typical reported information covers cells = usage or statistics.

     

    Questions:

    - Looks like Query and Report flows conta= in the same information. In normal operation, the Report flow should be eno= ugh, the Query flow only being used in special cases, for example when the ME has lost state (just booted, bug, etc). Agreed?=

    - The ME should be able to configure the = report flow. Configuration could be "send report every X seconds"= or "send report when variable X larger than Y". I imagine this c= ould be done over the action flow? Agreed?

    - A node will want to report an urgent event to the ME. On= e such events is "the topology appears to have changed". There an= y many cases where this information needs to be sent immediately, i.e. no time to wait for the next report cycle. We can consider this to be= an asynchronous report, or part of a new "Event" flow.

    - Same for the mote asking the ME for a schedule update.

     

    Thoughts?

     

    Thomas

     

     

    On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Xavi,

     

    Approach-(2) is more flexible and likely covers more= situations. But, it may bring some complexity to 6top, because 6top has to= make decision on the bandwidth request (add/delete), which needs some metr= ics, some intelligence. 

     

    What do you think?

     

    Qin<= /p>

     

     

    On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    Hi Qin, I like your (2).

     

    Note also that there = are situations that might have some differences.

    1-the track already exists.

    2-the track between t= he two entities does not exists

    in either case I thin= k that the node that requires certain BW to another node should talk to 6to= p, which processes that request and sends a request to the ME, the ME insta= lls that new track.

    does it make sense. Do you see any drawback on that = approach?

    X

     

    On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi all,

     

    During today's call, we presented three control flow= s between Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, an= d Report Flow, and started to talk about the 4th control flow. The thread w= ill continue the discussion about 4th flow.

     

    Here is the scenario: when a node finds that more ce= lls are needed, e.g. nodes wants to send 10pkt/s report at some time, it sh= ould be able to ask ME to install more bandwidth. 

     

    I can see two approaches:

    (1) Managed by ME, without 4th Control Flow. Assume = BandwidthUsageRate is a attribute in 6top. Then, ME can get the information= via Query Flow or Report Flow, and adjust the bandwidth of the node via Ac= tion Flow. 

    (2) Managed by 6top, with 4th Control Flow. 6top sen= ds Bandwidth Request to ME, and then ME install more bandwidth. This is the= 4th control flow.

     

    What do you think? Which one makes more sense?<= /o:p>

     

    Qin<= /p>

     

     

     

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



     

    --

    Thomas Watteyne, Ph. D=

    Sr. Networking Design = Engineer

    Dust Networks / Linear= Technology

    30695 Huntwood Ave

    Hayward, CA 94544-7021=

    +1 (510) 400-2978<= o:p>

     

    This e= -mail transmission, and any documents, files or previous e-mail messages at= tached to it may contain confidential information that is legally privilege= d. If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, you a= re hereby notified that any disclosure, copying, distribution or use of any= of the information contained in or attached to this transmission is STRICT= LY PROHIBITED. If you have received this transmission in error, please immediately notify me by reply e-mail, = or by telephone at (510) 400-2978, and destroy the original transmission an= d its attachments without reading or saving in any manner. Thank you.

     

    --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA75FD5EXMBX23adutwent_-- From twatteyne@gmail.com Tue Aug 27 15:40:05 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C3E9511E80E3 for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 15:40:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.857 X-Spam-Level: X-Spam-Status: No, score=-1.857 tagged_above=-999 required=5 tests=[AWL=0.120, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2DsYu+3NrgIO for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 15:40:04 -0700 (PDT) Received: from mail-ea0-x22c.google.com (mail-ea0-x22c.google.com [IPv6:2a00:1450:4013:c01::22c]) by ietfa.amsl.com (Postfix) with ESMTP id AEBC721F9DF0 for <6tsch@ietf.org>; Tue, 27 Aug 2013 15:40:03 -0700 (PDT) Received: by mail-ea0-f172.google.com with SMTP id r16so2570976ead.31 for <6tsch@ietf.org>; Tue, 27 Aug 2013 15:40:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=7ILTYzgLJ5gS+NUymfrK0eKZqQtj8YSj6whtMFNJJ/c=; b=B6j7w7J5F9fO6qstNRbGtBhZr21Omh7UBMLRn0Dz1sZwyvbn5QVFcl6E6Rk/qsL6Vt OWlp4K4YBpR5SiCQynjNuDgHGrDJeBgQti2XwZ0+RwNgrcADS+iaB16upu3b7cKpmU42 ZlPpbo6F58eAH7ct82mPXlMxuk32oJTH4Nt6jfwU8G3wjkzC2h8HOntESI/VLZoJT65y Q6uKgnlkzeqY5cos876NkcttMhoTBixRqXTWFi0gTfiHf4cm/qEL2PZ3D8r8xt9N5pHz jD/r4USapb03ciR00vuS8a/qDc4HNs8Y+24SNZlXWZNzNkCraY3E9WNW4VBRMYT6W3we tBNA== X-Received: by 10.15.83.2 with SMTP id b2mr38120866eez.28.1377643201504; Tue, 27 Aug 2013 15:40:01 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.14.119.73 with HTTP; Tue, 27 Aug 2013 15:39:41 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Tue, 27 Aug 2013 15:39:41 -0700 X-Google-Sender-Auth: zVSfnZSQh2aflEowtBobFAHwaLA Message-ID: To: "6tsch@ietf.org" <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=089e0160bc92a756ee04e4f58df4 Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 22:40:05 -0000 --089e0160bc92a756ee04e4f58df4 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Qin, You bring up a good point: over what cells with the reports travel? Another questions could be: over what cells will the request to install cells travel? I believe that, whatever the policy in place in the network, there will always need to be some cells installed for infrequent signaling traffic. If the report rate is very slow, it might qualify as "infrequent signaling traffic". For sure, the request to change the schedule qualifies. Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha schedule indicated in the draft can be used for the signaling traffic between the nodes and the ME. Of course, if the report rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not this early on. I agree with Diego that keeping the solution open to different alternative is key. Thomas On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne < diego.dujovne@mail.udp.cl> wrote: > Qin, Thomas, > Alternative (1) adds delay to define the slots to send the event > to the ME (propagate the new schedule), > while alternative (2) keeps reserved slots waiting for the event to > happen. > I think both alternatives should be included, and configured by the ME > depending > on the network requirements. > > More thoughts? > > Diego Dujovne > > 2013/8/27 Qin Wang : > > Thomas, > > > > I agree with almost all. Only some comments on "Report Flow". > > > > As you mentioned, there are two kinds of report scenarios, one is > > periodically report, another one is burst report or called as > event-driven > > report. I have no question on how periodically report works, which you > > described. But I'm not sure what the best way to handle event-driven > report > > is. I think we don't want to assume 6top sublayer is very intelligent, = in > > another word, the events and the trigger of events should be configured > by > > ME, just like the interval of periodically report. Make sense? > > > > If you agree to it, the remained issue is when and how the bandwidth f= or > > sending event-driven reports is reserved. Here are two ways I can see. > > (1) when a event is triggered, node sends a request to ME and ask some > BW to > > send the report. I believe that is how the 4th control flow works. > > (2) when ME configure the events and their triggers, ME also provisions > some > > BW for the node which allows the node to send the report triggered by > some > > event. > > > > I have no strong opinion on which one is better. But, the bottom line i= s > the > > configuration of the set of events and their triggers should be out of > 6top > > scope. Thought? > > > > Thanks > > Qin > > > > > > > > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: > >> > >> Qin, > >> > >> Please correct me if I'm wrong: > >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typica= l > >> commands are add/delete cells. > >> - Query Flow (ME->6top). ME asks 6top for some information. Typical > >> queries are about current cells usage or statistics. > >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical report= ed > >> information covers cells usage or statistics. > >> > >> Questions: > >> - Looks like Query and Report flows contain the same information. In > >> normal operation, the Report flow should be enough, the Query flow onl= y > >> being used in special cases, for example when the ME has lost state > (just > >> booted, bug, etc). Agreed? > >> - The ME should be able to configure the report flow. Configuration > could > >> be "send report every X seconds" or "send report when variable X large= r > than > >> Y". I imagine this could be done over the action flow? Agreed? > >> - A node will want to report an urgent event to the ME. One such event= s > is > >> "the topology appears to have changed". There any many cases where thi= s > >> information needs to be sent immediately, i.e. no time to wait for the > next > >> report cycle. We can consider this to be an asynchronous report, or > part of > >> a new "Event" flow. > >> - Same for the mote asking the ME for a schedule update. > >> > >> Thoughts? > >> > >> Thomas > >> > >> > >> > >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: > >>> > >>> Xavi, > >>> > >>> Approach-(2) is more flexible and likely covers more situations. But, > it > >>> may bring some complexity to 6top, because 6top has to make decision > on the > >>> bandwidth request (add/delete), which needs some metrics, some > intelligence. > >>> > >>> What do you think? > >>> > >>> Qin > >>> > >>> > >>> > >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen > >>> wrote: > >>>> > >>>> Hi Qin, I like your (2). > >>>> > >>>> Note also that there are situations that might have some differences= . > >>>> > >>>> 1-the track already exists. > >>>> 2-the track between the two entities does not exists > >>>> > >>>> in either case I think that the node that requires certain BW to > another > >>>> node should talk to 6top, which processes that request and sends a > request > >>>> to the ME, the ME installs that new track. > >>>> > >>>> does it make sense. Do you see any drawback on that approach? > >>>> > >>>> X > >>>> > >>>> > >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: > >>>>> > >>>>> Hi all, > >>>>> > >>>>> During today's call, we presented three control flows between > >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and > Report > >>>>> Flow, and started to talk about the 4th control flow. The thread wi= ll > >>>>> continue the discussion about 4th flow. > >>>>> > >>>>> Here is the scenario: when a node finds that more cells are needed, > >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be > able to > >>>>> ask ME to install more bandwidth. > >>>>> > >>>>> I can see two approaches: > >>>>> (1) Managed by ME, without 4th Control Flow. Assume > BandwidthUsageRate > >>>>> is a attribute in 6top. Then, ME can get the information via Query > Flow or > >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. > >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth > >>>>> Request to ME, and then ME install more bandwidth. This is the 4th > control > >>>>> flow. > >>>>> > >>>>> What do you think? Which one makes more sense? > >>>>> > >>>>> Qin > >>>>> > >>>>> > >>>>> > >>>>> _______________________________________________ > >>>>> 6tsch mailing list > >>>>> 6tsch@ietf.org > >>>>> https://www.ietf.org/mailman/listinfo/6tsch > >>>>> > >>>> > >>> > >>> > >>> _______________________________________________ > >>> 6tsch mailing list > >>> 6tsch@ietf.org > >>> https://www.ietf.org/mailman/listinfo/6tsch > >>> > >> > >> > >> > >> -- > >> Thomas Watteyne, Ph. D > >> Sr. Networking Design Engineer > >> Dust Networks / Linear Technology > >> 30695 Huntwood Ave > >> Hayward, CA 94544-7021 > >> +1 (510) 400-2978 > >> twatteyne@linear.com > >> > >> This e-mail transmission, and any documents, files or previous e-mail > >> messages attached to it may contain confidential information that is > legally > >> privileged. If you are not the intended recipient, or a person > responsible > >> for delivering it to the intended recipient, you are hereby notified > that > >> any disclosure, copying, distribution or use of any of the information > >> contained in or attached to this transmission is STRICTLY PROHIBITED. > If you > >> have received this transmission in error, please immediately notify me > by > >> reply e-mail, or by telephone at (510) 400-2978, and destroy the > original > >> transmission and its attachments without reading or saving in any > manner. > >> Thank you. > > > > > > > > _______________________________________________ > > 6tsch mailing list > > 6tsch@ietf.org > > https://www.ietf.org/mailman/listinfo/6tsch > > > > > > -- > DIEGO DUJOVNE > Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones > Facultad de Ingenier=EDa UDP > www.ingenieria.udp.cl > (56 2) 676 8125 > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > --089e0160bc92a756ee04e4f58df4 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Qin,

    You bring up a good point: over wh= at cells with the reports travel? Another questions could be: over what cel= ls will the request to install cells travel? I believe that, whatever the p= olicy in place in the network, there will always need to be some cells inst= alled for infrequent signaling traffic. If the report rate is very slow, it= might qualify as "infrequent signaling traffic". For sure, the r= equest to change the schedule qualifies.

    Isn't the answer=A0draft-vilajosana-6tsch-basic? Th= at is, the slotted Aloha schedule indicated in the draft can be used for th= e signaling traffic between the nodes and the ME. Of course, if the report = rate is very high, some dedicate track might be installed, but I do not bel= ieve this is needed, certainly not this early on.

    I agree with Diego that keeping the solution open to di= fferent alternative is key.

    Thomas


    On Tue, Aug 27, 2= 013 at 2:29 PM, Prof. Diego Dujovne <diego.dujovne@mail.udp.cl= > wrote:
    Qin, Thomas,
    =A0 =A0 =A0 Alternative (1) adds delay to define the slots to send the even= t
    to the ME (propagate the new schedule),
    while alternative (2) =A0keeps reserved slots waiting for the event to happ= en.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berk= eley.edu>:
    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driv= en report
    > is. I think we don't want to assume 6top sublayer is very intellig= ent, in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is =A0when and how the bandwidt= h for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosa= na@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control fl= ows between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf.org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (510) 400-2978
    >> twatteyne@linear.com >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676= 8125
    ___________________________________= ____________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    --089e0160bc92a756ee04e4f58df4-- From twatteyne@gmail.com Tue Aug 27 15:44:44 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5CB8F11E80E7 for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 15:44:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.863 X-Spam-Level: X-Spam-Status: No, score=-1.863 tagged_above=-999 required=5 tests=[AWL=0.114, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MMYIroB0BtKX for <6tsch@ietfa.amsl.com>; Tue, 27 Aug 2013 15:44:43 -0700 (PDT) Received: from mail-ea0-x235.google.com (mail-ea0-x235.google.com [IPv6:2a00:1450:4013:c01::235]) by ietfa.amsl.com (Postfix) with ESMTP id F1C6911E81B5 for <6tsch@ietf.org>; Tue, 27 Aug 2013 15:44:41 -0700 (PDT) Received: by mail-ea0-f181.google.com with SMTP id d10so2539332eaj.26 for <6tsch@ietf.org>; Tue, 27 Aug 2013 15:44:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=9Tn3p5RyUZPSkIB8ByUvhi5NivEeKP7hymS/cPcPx+Y=; b=U25skpQYzHZ0rf923ArYM064OArAZsieORpOFHx8er9RsXeTHMDwkfd9wVgzsyJIJE D9qHqHGoxcdiGRj8ADTYMYXi7d/PnglFuhrP7wPRTsBPrxJXXpyh6VYmObSlLRBghZVz 1nVF1sA0hra3vtc84B1TECXPmNcS2C1AiAem5rfMZRsOVU6iXVqSHVFhk6Lum1WHbP8K FB+zxqUgGeR2bPPALC68LrcAd7ZEtZJz6+ru8skOFCBYUtWPNnf6/4aCrAsiUk5lC+3e BzDXltzkJvVXq8STjszqnWPvlRV1Wn9u47mB/Bjoj+1EWMRisEpZKSodyrVDjVNKB+UF C9BQ== X-Received: by 10.14.105.69 with SMTP id j45mr206498eeg.60.1377643476094; Tue, 27 Aug 2013 15:44:36 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.14.119.73 with HTTP; Tue, 27 Aug 2013 15:44:16 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA75FD5@EXMBX23.ad.utwente.nl> References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA75FD5@EXMBX23.ad.utwente.nl> From: Thomas Watteyne Date: Tue, 27 Aug 2013 15:44:16 -0700 X-Google-Sender-Auth: iMYFobM08PE5vTI_IEIBrI1xszo Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=001a11c1b7fc053c5704e4f59ea6 Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Aug 2013 22:44:44 -0000 --001a11c1b7fc053c5704e4f59ea6 Content-Type: text/plain; charset=ISO-8859-1 Pouria. Please see *inline*. Thomas On Tue, Aug 27, 2013 at 2:48 PM, wrote: > Qin, Thomas, **** > > Let me enter to your discussion.**** > > ** ** > > First, let me see if I am on the same track. Does ME mean the Management > Entity to send management flows to the PCE (in centralized approach) and to > Signaling protocol or higher layers (in distributed approach). Am I right? > *I believe we haven't been very rigorous, thanks for pointing that out. ME (Management Entity) was defined by Qin as either some distributed layer, or a centralized PCE. We want to make sure that the format we need to define for work item 1 is generic enough for both the centralized and distributed case, hence the use of the term ME. In this thread, we are mainly talking about the protocol between the node and the PCE.* > **** > > I completely agree with Qin description.**** > > Regarding to two specified ways (by Qin) to ask bandwidth for sending > event-driven reports, I think way (2) makes more sense. Because the events > should be send through the *multi-hop* path (track), toward the network > manager (i.e. PCE). Am I right? For sure, way (1) takes more time to > reserve potential resources (either in a distributed or centralized manner) > for delivering those events toward the final destination (i.e. PCE). By > considering way (2), the PCE or higher layers can reserve some shared cells > or extra dedicated cells beforehand, for delivering potential event, from > node A toward the final destination (i.e. PCE) along the track.**** > > Am I missing anything? > *I believe this sums it up nicely.* > **** > > ** ** > > Best Wishes,**** > > Pouria **** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 27, 2013 11:10 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org; Xavier Vilajosana Guillen > *Subject:* Re: [6tsch] the 4th control flow**** > > ** ** > > Thomas,**** > > ** ** > > I agree with almost all. Only some comments on "Report Flow". **** > > ** ** > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-driven > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven report > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured by > ME, just like the interval of periodically report. Make sense? **** > > ** ** > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see.**** > > (1) when a event is triggered, node sends a request to ME and ask some BW > to send the report. I believe that is how the 4th control flow works.**** > > (2) when ME configure the events and their triggers, ME also provisions > some BW for the node which allows the node to send the report triggered by > some event.**** > > ** ** > > I have no strong opinion on which one is better. But, the bottom line is > the configuration of the set of events and their triggers should be out of > 6top scope. Thought?**** > > ** ** > > Thanks**** > > Qin**** > > ** ** > > ** ** > > ** ** > > ** ** > > ** ** > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > wrote:**** > > Qin,**** > > ** ** > > Please correct me if I'm wrong:**** > > - Action Flow (ME->6top). ME asks 6top to execute some command. Typical > commands are add/delete cells.**** > > - Query Flow (ME->6top). ME asks 6top for some information. Typical > queries are about current cells usage or statistics.**** > > - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported > information covers cells usage or statistics.**** > > ** ** > > Questions:**** > > - Looks like Query and Report flows contain the same information. In > normal operation, the Report flow should be enough, the Query flow only > being used in special cases, for example when the ME has lost state (just > booted, bug, etc). Agreed?**** > > - The ME should be able to configure the report flow. Configuration could > be "send report every X seconds" or "send report when variable X larger > than Y". I imagine this could be done over the action flow? Agreed?**** > > - A node will want to report an urgent event to the ME. One such events is > "the topology appears to have changed". There any many cases where > this information needs to be sent immediately, i.e. no time to wait for the > next report cycle. We can consider this to be an asynchronous report, or > part of a new "Event" flow.**** > > - Same for the mote asking the ME for a schedule update.**** > > ** ** > > Thoughts?**** > > ** ** > > Thomas**** > > ** ** > > ** ** > > On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang wrote:** > ** > > Xavi,**** > > ** ** > > Approach-(2) is more flexible and likely covers more situations. But, it > may bring some complexity to 6top, because 6top has to make decision on the > bandwidth request (add/delete), which needs some metrics, some > intelligence. **** > > ** ** > > What do you think?**** > > ** ** > > Qin**** > > ** ** > > ** ** > > On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen < > xvilajosana@eecs.berkeley.edu> wrote:**** > > Hi Qin, I like your (2). **** > > **** > > Note also that there are situations that might have some differences.**** > > 1-the track already exists.**** > > 2-the track between the two entities does not exists**** > > in either case I think that the node that requires certain BW to another > node should talk to 6top, which processes that request and sends a request > to the ME, the ME installs that new track.**** > > does it make sense. Do you see any drawback on that approach? > > X **** > > ** ** > > On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang wrote:** > ** > > Hi all,**** > > ** ** > > During today's call, we presented three control flows between Management > Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Report Flow, and > started to talk about the 4th control flow. The thread will continue the > discussion about 4th flow.**** > > ** ** > > Here is the scenario: when a node finds that more cells are needed, e.g. > nodes wants to send 10pkt/s report at some time, it should be able to ask > ME to install more bandwidth. **** > > ** ** > > I can see two approaches:**** > > (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRate is > a attribute in 6top. Then, ME can get the information via Query Flow or > Report Flow, and adjust the bandwidth of the node via Action Flow. **** > > (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth Request > to ME, and then ME install more bandwidth. This is the 4th control flow.** > ** > > ** ** > > What do you think? Which one makes more sense?**** > > ** ** > > Qin**** > > ** ** > > ** ** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > ** ** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > > > **** > > ** ** > > -- **** > > Thomas Watteyne, Ph. D**** > > Sr. Networking Design Engineer**** > > Dust Networks / Linear Technology**** > > 30695 Huntwood Ave**** > > Hayward, CA 94544-7021**** > > +1 (510) 400-2978**** > > twatteyne@linear.com**** > > ** ** > > This e-mail transmission, and any documents, files or previous e-mail > messages attached to it may contain confidential information that is > legally privileged. If you are not the intended recipient, or a person > responsible for delivering it to the intended recipient, you are hereby > notified that any disclosure, copying, distribution or use of any of the > information contained in or attached to this transmission is STRICTLY > PROHIBITED. If you have received this transmission in error, please > immediately notify me by reply e-mail, or by telephone at (510) 400-2978, > and destroy the original transmission and its attachments without reading > or saving in any manner. Thank you.**** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --001a11c1b7fc053c5704e4f59ea6 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Pouria.
    Please see inline.
    Thomas

    On Tue, Aug 27,= 2013 at 2:48 PM, <P.Zand@utwente.nl> wrote:

    Qin, Thomas,

    Let me enter to your disc= ussion.

    =A0<= /p>

    First, let me see if I am= on the same track. Does ME mean the Management Entity to send management f= lows to the PCE (in centralized approach) and to Signaling protocol or higher layers (in distributed approach). Am I right?


    I = believe we haven't been very rigorous, thanks for pointing that out. ME= (Management Entity) was defined by Qin as either some distributed layer, o= r a centralized PCE. We want to make sure that the format we need to define= for work item 1 is generic enough for both the centralized and distributed= case, hence the use of the term ME. In this thread, we are mainly talking = about the protocol between the node and the PCE.
    =A0

    I completely agree with Q= in description.

    Regarding to two specifie= d ways (by Qin) to ask bandwidth for sending event-driven reports, I think = way (2) makes more sense. Because the events should be send through the multi-hop path (track), toward the network manager (i.e= . PCE). Am I right? For sure, way (1) takes more time to reserve potential = resources (either in a distributed or centralized manner) for delivering th= ose events toward the final destination (i.e. PCE). By considering way (2), the PCE or higher layers can reserve s= ome shared cells or extra dedicated cells beforehand, for delivering potent= ial event, from node A toward the final destination (i.e. PCE) along the tr= ack.

    Am I missing anything?


    I believe this sums it up nicely.
    =A0

    =A0<= /p>

    Best Wishes,

    Pouria =A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 27, 2013 11:10 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg; Xavier Vilajosana Guillen
    Subject: Re: [6tsch] the 4th control flow

    =A0

    Thomas,

    =A0

    I agree with almost all. Only some comments on "= ;Report Flow".=A0

    =A0

    As you mentioned, there are two kinds of report scen= arios, one is periodically report, another one is burst report or called as= event-driven report. I have no question on how periodically report works, = which you described. But I'm not sure what the best way to handle event-driven report is. I think we don't w= ant to assume 6top sublayer is very intelligent, in another word, the event= s and the trigger of events should be configured by ME, just like the inter= val of periodically report. Make sense?=A0

    =A0

    If you agree to it, the remained issue is =A0when an= d how the bandwidth for sending event-driven reports is reserved. Here are = two ways I can see.

    (1) when a event is triggered, node sends a request = to ME and ask some BW to send the report. I believe that is how the 4th con= trol flow works.

    (2) when ME configure the events and their triggers,= ME also provisions some BW for the node which allows the node to send the = report triggered by some event.

    =A0

    I have no strong opinion on which one is better. But= , the bottom line is the configuration of the set of events and their trigg= ers should be out of 6top scope. Thought?

    =A0

    Thanks

    Qin

    =A0

    =A0

    =A0

    =A0

    =A0

    On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <= ;twatteyne@linear= .com> wrote:

    Qin,

    =A0

    Please correct me if I'm wrong:

    -=A0Action Flow (ME->6top). ME asks 6t= op to execute some command. Typical commands are add/delete cells.

    -=A0Query Flow=A0(ME->6top). ME asks 6= top for some information. Typical queries are about current cells usage or = statistics.

    -=A0Report Flow=A0(6top->ME). 6top tel= l ME how it is doing. Typical reported information covers=A0cells usage or = statistics.

    =A0

    Questions:

    - Looks like Query and Report flows conta= in the same information. In normal operation, the Report flow should be eno= ugh, the Query flow only being used in special cases, for example when the ME has lost state (just booted, bug, etc). Agreed?=

    - The ME should be able to configure the = report flow. Configuration could be "send report every X seconds"= or "send report when variable X larger than Y". I imagine this c= ould be done over the action flow? Agreed?

    - A node will want to report an urgent event to the ME. On= e such events is "the topology appears to have changed". There an= y many cases where this=A0information=A0needs to be sent immediately, i.e. no time to wait for the next report cycle. We can consider this to be= an asynchronous report, or part of a new "Event" flow.=

    - Same for the mote asking the ME for a schedule update.

    =A0

    Thoughts?

    =A0

    Thomas

    =A0

    =A0

    On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Xavi,

    =A0

    Approach-(2) is more flexible and likely covers more= situations. But, it may bring some complexity to 6top, because 6top has to= make decision on the bandwidth request (add/delete), which needs some metr= ics, some intelligence.=A0

    =A0

    What do you think?

    =A0

    Qin

    =A0

    =A0

    On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana G= uillen <xvilajosana@eecs.berkeley.edu> wrote:

    Hi Qin, I like your (2).

    =A0

    Note also that there = are situations that might have some differences.

    1-the track already exists.

    2-the track between t= he two entities does not exists

    in either case I thin= k that the node that requires certain BW to another node should talk to 6to= p, which processes that request and sends a request to the ME, the ME insta= lls that new track.

    does it make sense. Do you see any drawback on that = approach?

    X

    =A0

    On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Hi all,

    =A0

    During today's call, we presented three control = flows between Management Entity (ME) and 6top, i.e. Action Flow, Query Flow= , and Report Flow, and started to talk about the 4th control flow. The thre= ad will continue the discussion about 4th flow.

    =A0

    Here is the scenario: when a node finds that more ce= lls are needed, e.g. nodes wants to send 10pkt/s report at some time, it sh= ould be able to ask ME to install more bandwidth.=A0

    =A0

    I can see two approaches:

    (1) Managed by ME, without 4th Control Flow. Assume = BandwidthUsageRate is a attribute in 6top. Then, ME can get the information= via Query Flow or Report Flow, and adjust the bandwidth of the node via Ac= tion Flow.=A0

    (2) Managed by 6top, with 4th Control Flow. 6top sen= ds Bandwidth Request to ME, and then ME install more bandwidth. This is the= 4th control flow.

    =A0

    What do you think? Which one makes more sense?

    =A0

    Qin

    =A0

    =A0

    =A0

    _____________________= __________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    =A0

    --

    Thomas Watteyne, Ph. D=

    Sr. Networking Design = Engineer

    Dust Networks / Linear= Technology

    30695 Huntwood Ave<= /u>

    Hayward, CA 94544-7021=

    =A0

    This e= -mail transmission, and any documents, files or previous e-mail messages at= tached to it may contain confidential information that is legally privilege= d. If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, you a= re hereby notified that any disclosure, copying, distribution or use of any= of the information contained in or attached to this transmission is STRICT= LY PROHIBITED. If you have received this transmission in error, please immediately notify me by reply e-mail, = or by telephone at (510) 400-2978, and destroy the original transmis= sion and its attachments without reading or saving in any manner. Thank you= .

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --001a11c1b7fc053c5704e4f59ea6-- From maria-rita.palattella@uni.lu Wed Aug 28 02:18:53 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E2E4C11E826C for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 02:18:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.448 X-Spam-Level: X-Spam-Status: No, score=-6.448 tagged_above=-999 required=5 tests=[AWL=0.150, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rCOYP2lX31HC for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 02:18:49 -0700 (PDT) Received: from hercules.uni.lu (hercules.uni.lu [158.64.76.33]) by ietfa.amsl.com (Postfix) with ESMTP id 5521B11E8247 for <6tsch@ietf.org>; Wed, 28 Aug 2013 02:18:37 -0700 (PDT) X-IronPort-AV: E=Sophos;i="4.89,975,1367964000"; d="scan'208,217";a="26131733" Received: from unknown (HELO Travis.uni.lux) ([10.21.2.19]) by hercules.uni.lu with ESMTP; 28 Aug 2013 11:18:36 +0200 Received: from HOSHI.uni.lux ([fe80::499:a33:4e68:4af9]) by Travis.uni.lux ([fe80::653b:7b8e:4641:a750%10]) with mapi id 14.03.0123.003; Wed, 28 Aug 2013 11:18:36 +0200 From: Maria Rita PALATTELLA To: Thomas Watteyne , 6TSCH <6tsch@ietf.org> Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOo2nA37SuPY1UNUSxyNbir/bk6pmpddcAgAAPuQCAANIbEA== Date: Wed, 28 Aug 2013 09:18:35 +0000 Message-ID: References: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA75FD5@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.91.0.96] Content-Type: multipart/alternative; boundary="_000_F085911F642A6847987ADA23E611780D1858E554hoshiunilux_" MIME-Version: 1.0 Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 09:18:54 -0000 --_000_F085911F642A6847987ADA23E611780D1858E554hoshiunilux_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thomas, Pouria, I would also go for option (2). IMHO it makes more sense, because option (1= ) implies for sure both delay and some extra-overhead that we may want to a= void. Maria Rita From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Wednesday, August 28, 2013 12:44 AM To: 6TSCH Subject: Re: [6tsch] the 4th control flow Pouria. Please see inline. Thomas On Tue, Aug 27, 2013 at 2:48 PM, > wrote: Qin, Thomas, Let me enter to your discussion. First, let me see if I am on the same track. Does ME mean the Management En= tity to send management flows to the PCE (in centralized approach) and to S= ignaling protocol or higher layers (in distributed approach). Am I right? I believe we haven't been very rigorous, thanks for pointing that out. ME (= Management Entity) was defined by Qin as either some distributed layer, or = a centralized PCE. We want to make sure that the format we need to define f= or work item 1 is generic enough for both the centralized and distributed c= ase, hence the use of the term ME. In this thread, we are mainly talking ab= out the protocol between the node and the PCE. I completely agree with Qin description. Regarding to two specified ways (by Qin) to ask bandwidth for sending event= -driven reports, I think way (2) makes more sense. Because the events shoul= d be send through the multi-hop path (track), toward the network manager (i= .e. PCE). Am I right? For sure, way (1) takes more time to reserve potentia= l resources (either in a distributed or centralized manner) for delivering = those events toward the final destination (i.e. PCE). By considering way (2= ), the PCE or higher layers can reserve some shared cells or extra dedicate= d cells beforehand, for delivering potential event, from node A toward the = final destination (i.e. PCE) along the track. Am I missing anything? I believe this sums it up nicely. Best Wishes, Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 27, 2013 11:10 PM To: Thomas Watteyne Cc: 6tsch@ietf.org; Xavier Vilajosana Guillen Subject: Re: [6tsch] the 4th control flow Thomas, I agree with almost all. Only some comments on "Report Flow". As you mentioned, there are two kinds of report scenarios, one is periodica= lly report, another one is burst report or called as event-driven report. I= have no question on how periodically report works, which you described. Bu= t I'm not sure what the best way to handle event-driven report is. I think = we don't want to assume 6top sublayer is very intelligent, in another word,= the events and the trigger of events should be configured by ME, just like= the interval of periodically report. Make sense? If you agree to it, the remained issue is when and how the bandwidth for s= ending event-driven reports is reserved. Here are two ways I can see. (1) when a event is triggered, node sends a request to ME and ask some BW t= o send the report. I believe that is how the 4th control flow works. (2) when ME configure the events and their triggers, ME also provisions som= e BW for the node which allows the node to send the report triggered by som= e event. I have no strong opinion on which one is better. But, the bottom line is th= e configuration of the set of events and their triggers should be out of 6t= op scope. Thought? Thanks Qin On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > wrote: Qin, Please correct me if I'm wrong: - Action Flow (ME->6top). ME asks 6top to execute some command. Typical com= mands are add/delete cells. - Query Flow (ME->6top). ME asks 6top for some information. Typical queries= are about current cells usage or statistics. - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported in= formation covers cells usage or statistics. Questions: - Looks like Query and Report flows contain the same information. In normal= operation, the Report flow should be enough, the Query flow only being use= d in special cases, for example when the ME has lost state (just booted, bu= g, etc). Agreed? - The ME should be able to configure the report flow. Configuration could b= e "send report every X seconds" or "send report when variable X larger than= Y". I imagine this could be done over the action flow? Agreed? - A node will want to report an urgent event to the ME. One such events is = "the topology appears to have changed". There any many cases where this inf= ormation needs to be sent immediately, i.e. no time to wait for the next re= port cycle. We can consider this to be an asynchronous report, or part of a= new "Event" flow. - Same for the mote asking the ME for a schedule update. Thoughts? Thomas On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: Xavi, Approach-(2) is more flexible and likely covers more situations. But, it ma= y bring some complexity to 6top, because 6top has to make decision on the b= andwidth request (add/delete), which needs some metrics, some intelligence. What do you think? Qin On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen > wrote: Hi Qin, I like your (2). Note also that there are situations that might have some differences. 1-the track already exists. 2-the track between the two entities does not exists in either case I think that the node that requires certain BW to another no= de should talk to 6top, which processes that request and sends a request to= the ME, the ME installs that new track. does it make sense. Do you see any drawback on that approach? X On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: Hi all, During today's call, we presented three control flows between Management En= tity (ME) and 6top, i.e. Action Flow, Query Flow, and Report Flow, and star= ted to talk about the 4th control flow. The thread will continue the discus= sion about 4th flow. Here is the scenario: when a node finds that more cells are needed, e.g. no= des wants to send 10pkt/s report at some time, it should be able to ask ME = to install more bandwidth. I can see two approaches: (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRate is a= attribute in 6top. Then, ME can get the information via Query Flow or Repo= rt Flow, and adjust the bandwidth of the node via Action Flow. (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth Request to= ME, and then ME install more bandwidth. This is the 4th control flow. What do you think? Which one makes more sense? Qin _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch -- Thomas Watteyne, Ph. D Sr. Networking Design Engineer Dust Networks / Linear Technology 30695 Huntwood Ave Hayward, CA 94544-7021 +1 (510) 400-2978 twatteyne@linear.com This e-mail transmission, and any documents, files or previous e-mail messa= ges attached to it may contain confidential information that is legally pri= vileged. If you are not the intended recipient, or a person responsible for= delivering it to the intended recipient, you are hereby notified that any = disclosure, copying, distribution or use of any of the information containe= d in or attached to this transmission is STRICTLY PROHIBITED. If you have r= eceived this transmission in error, please immediately notify me by reply e= -mail, or by telephone at (510) 400-2978, and des= troy the original transmission and its attachments without reading or savin= g in any manner. Thank you. _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_F085911F642A6847987ADA23E611780D1858E554hoshiunilux_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Thomas, Pouria,

    I would also go for optio= n (2). IMHO it makes more sense, because option (1) implies for sure both d= elay and some extra-overhead that we may want to avoid.

    Maria Rita

     <= /p>

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 28, 2013 12:44 AM
    To: 6TSCH
    Subject: Re: [6tsch] the 4th control flow

     

    Pouria.

    Please see inline.

    Thomas

     

    On Tue, Aug 27, 2013 at 2:48 PM, <P.Zand@utwente.nl> wrote:

    Qin, Thomas,

    Let me enter to your discussion.=

     

    First, let me see if I am on the same t= rack. Does ME mean the Management Entity to send management flows to the PCE (in centralized approach) and to Signaling protocol or hi= gher layers (in distributed approach). Am I right?

     

    I believe we haven't b= een very rigorous, thanks for pointing that out. ME (Management Entity) was= defined by Qin as either some distributed layer, or a centralized PCE. We = want to make sure that the format we need to define for work item 1 is generic enough for both the centralized = and distributed case, hence the use of the term ME. In this thread, we are = mainly talking about the protocol between the node and the PCE.<= o:p>

     

    I completely agree with Qin description= .

    Regarding to two specified ways (by Qin= ) to ask bandwidth for sending event-driven reports, I think way (2) makes more sense. Because the events should be send through the multi-hop path (track), toward the network manager (i.e. PCE). Am I ri= ght? For sure, way (1) takes more time to reserve potential resources (eith= er in a distributed or centralized manner) for delivering those events toward the final destination (i.e. PCE= ). By considering way (2), the PCE or higher layers can reserve some shared= cells or extra dedicated cells beforehand, for delivering potential event,= from node A toward the final destination (i.e. PCE) along the track.

    Am I missing anything?

     

    I believe this sums it= up nicely.

     

     

    Best Wishes,

    Pouria     <= o:p>

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 27, 2013 11:10 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg; Xavier Vilajosana Guillen
    Subject: Re: [6tsch] the 4th control flow

     

    Thomas,

     

    I agree with almost all. Only some comments on "Report Flow&q= uot;. 

     

    As you mentioned, there are two kinds of report scenarios, one is = periodically report, another one is burst report or called as event-driven = report. I have no question on how periodically report works, which you described. But I'm not sure what the best way to h= andle event-driven report is. I think we don't want to assume 6top sublayer= is very intelligent, in another word, the events and the trigger of events= should be configured by ME, just like the interval of periodically report. Make sense? 

     

    If you agree to it, the remained issue is  when and how the b= andwidth for sending event-driven reports is reserved. Here are two ways I = can see.

    (1) when a event is triggered, node sends a request to ME and ask = some BW to send the report. I believe that is how the 4th control flow work= s.

    (2) when ME configure the events and their triggers, ME also provi= sions some BW for the node which allows the node to send the report trigger= ed by some event.

     

    I have no strong opinion on which one is better. But, the bottom l= ine is the configuration of the set of events and their triggers should be = out of 6top scope. Thought?

     

    Thanks

    Qin

     

     

     

     

     

    On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com> w= rote:

    Qin,

     

    Please correct me if I'm wrong:

    - Action Flow (ME->6top). ME asks 6top to execu= te some command. Typical commands are add/delete cells.

    - Query Flow (ME->6top). ME asks 6top for = some information. Typical queries are about current cells usage or statisti= cs.

    - Report Flow (6top->ME). 6top tell ME how= it is doing. Typical reported information covers cells usage or stati= stics.

     

    Questions:

    - Looks like Query and Report flows contain the same in= formation. In normal operation, the Report flow should be enough, the Query flow only being used in special cases, for example when = the ME has lost state (just booted, bug, etc). Agreed?

    - The ME should be able to configure the report flow. C= onfiguration could be "send report every X seconds" or "send report when variable X larger than Y". I imagine this could be done o= ver the action flow? Agreed?

    - A node will want to report an urgent event to the ME. One such events = is "the topology appears to have changed". There any many cases where this information needs to be sent immediately, i.e. = no time to wait for the next report cycle. We can consider this to be an as= ynchronous report, or part of a new "Event" flow.

    - Same for the mote asking the ME for a schedule update.

     

    Thoughts?

     

    Thomas

     

     

    On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= o:p>

    Xavi,

     

    Approach-(2) is more flexible and likely covers more situations. B= ut, it may bring some complexity to 6top, because 6top has to make decision= on the bandwidth request (add/delete), which needs some metrics, some intelligence. 

     

    What do you think?

     

    Qin

     

     

    On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen <xvilajosana= @eecs.berkeley.edu> wrote:

    Hi Qin, I like your (2).

     

    Note also that there are situations that might have some differences.

    1-the track already exists.

    2-the track between the two entities does not exists

    in either case I think that the node that requires certain BW to another= node should talk to 6top, which processes that request and sends a request= to the ME, the ME installs that new track.

    does it make sense. Do you see any drawback on that approach?

    X

     

    On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= o:p>

    Hi all,

     

    During today's call, we presented three control flows between Mana= gement Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Report Flow,= and started to talk about the 4th control flow. The thread will continue the discussion about 4th flow.

     

    Here is the scenario: when a node finds that more cells are needed= , e.g. nodes wants to send 10pkt/s report at some time, it should be able t= o ask ME to install more bandwidth. 

     

    I can see two approaches:

    (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsage= Rate is a attribute in 6top. Then, ME can get the information via Query Flo= w or Report Flow, and adjust the bandwidth of the node via Action Flow. 

    (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth R= equest to ME, and then ME install more bandwidth. This is the 4th control f= low.

     

    What do you think? Which one makes more sense?

     

    Qin

     

     

     

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



     

    --

    Thomas Watteyne, Ph. D

    Sr. Networking Design Engineer

    Dust Networks / Linear Technology

    30695 Huntwood Ave=

    Hayward, CA 94544-7021

     

    This e-mail transmis= sion, and any documents, files or previous e-mail messages attached to it m= ay contain confidential information that is legally privileged. If you are not the intended recipient, or a person = responsible for delivering it to the intended recipient, you are hereby not= ified that any disclosure, copying, distribution or use of any of the infor= mation contained in or attached to this transmission is STRICTLY PROHIBITED. If you have received this tra= nsmission in error, please immediately notify me by reply e-mail, or by tel= ephone at (510) 400-2978, = and destroy the original transmission and its attachments without reading o= r saving in any manner. Thank you.

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_F085911F642A6847987ADA23E611780D1858E554hoshiunilux_-- From maria-rita.palattella@uni.lu Wed Aug 28 02:38:47 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0BDF111E8273 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 02:38:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.498 X-Spam-Level: X-Spam-Status: No, score=-6.498 tagged_above=-999 required=5 tests=[AWL=0.100, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pCDcA76sD6uU for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 02:38:37 -0700 (PDT) Received: from hercules.uni.lu (hercules.uni.lu [158.64.76.33]) by ietfa.amsl.com (Postfix) with ESMTP id BDEE611E815C for <6tsch@ietf.org>; Wed, 28 Aug 2013 02:38:31 -0700 (PDT) X-IronPort-AV: E=Sophos;i="4.89,975,1367964000"; d="scan'208,217";a="26132302" Received: from unknown (HELO REED.uni.lux) ([10.21.2.9]) by hercules.uni.lu with ESMTP; 28 Aug 2013 11:38:30 +0200 Received: from HOSHI.uni.lux ([fe80::499:a33:4e68:4af9]) by REED.uni.lux ([fe80::31bb:b7a3:7abb:813e%10]) with mapi id 14.03.0123.003; Wed, 28 Aug 2013 11:38:29 +0200 From: Maria Rita PALATTELLA To: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOo2nA37SuPY1UNUSxyNbir/bk6pmpcIqAgAATvoCAANTQwA== Date: Wed, 28 Aug 2013 09:38:28 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.91.0.96] Content-Type: multipart/alternative; boundary="_000_F085911F642A6847987ADA23E611780D1858E56Fhoshiunilux_" MIME-Version: 1.0 Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 09:38:47 -0000 --_000_F085911F642A6847987ADA23E611780D1858E56Fhoshiunilux_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thomas, I believe that after defining the message format for each flow, we= will have to address the issue you have just raised up, i.e., the cells to= be used for any kind of signaling traffic (i.e., add/delete cells, report = traffic, etc.). Even though we may start using the slotted aloha schedule approach, in the = future, we may think about dedicated tracks, to be built according to the r= equirements of the schedule used for transferring the actual data traffic. What do you think? Maria Rita From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Wednesday, August 28, 2013 12:40 AM To: 6tsch@ietf.org Subject: Re: [6tsch] the 4th control flow Qin, You bring up a good point: over what cells with the reports travel? Another= questions could be: over what cells will the request to install cells trav= el? I believe that, whatever the policy in place in the network, there will= always need to be some cells installed for infrequent signaling traffic. I= f the report rate is very slow, it might qualify as "infrequent signaling t= raffic". For sure, the request to change the schedule qualifies. Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha s= chedule indicated in the draft can be used for the signaling traffic betwee= n the nodes and the ME. Of course, if the report rate is very high, some de= dicate track might be installed, but I do not believe this is needed, certa= inly not this early on. I agree with Diego that keeping the solution open to different alternative = is key. Thomas On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne > wrote: Qin, Thomas, Alternative (1) adds delay to define the slots to send the event to the ME (propagate the new schedule), while alternative (2) keeps reserved slots waiting for the event to happen= . I think both alternatives should be included, and configured by the ME depe= nding on the network requirements. More thoughts? Diego Dujovne 2013/8/27 Qin Wang >: > Thomas, > > I agree with almost all. Only some comments on "Report Flow". > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-drive= n > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven repo= rt > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured b= y > ME, just like the interval of periodically report. Make sense? > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see. > (1) when a event is triggered, node sends a request to ME and ask some BW= to > send the report. I believe that is how the 4th control flow works. > (2) when ME configure the events and their triggers, ME also provisions s= ome > BW for the node which allows the node to send the report triggered by som= e > event. > > I have no strong opinion on which one is better. But, the bottom line is = the > configuration of the set of events and their triggers should be out of 6t= op > scope. Thought? > > Thanks > Qin > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: >> >> Qin, >> >> Please correct me if I'm wrong: >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typical >> commands are add/delete cells. >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> queries are about current cells usage or statistics. >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported >> information covers cells usage or statistics. >> >> Questions: >> - Looks like Query and Report flows contain the same information. In >> normal operation, the Report flow should be enough, the Query flow only >> being used in special cases, for example when the ME has lost state (jus= t >> booted, bug, etc). Agreed? >> - The ME should be able to configure the report flow. Configuration coul= d >> be "send report every X seconds" or "send report when variable X larger = than >> Y". I imagine this could be done over the action flow? Agreed? >> - A node will want to report an urgent event to the ME. One such events = is >> "the topology appears to have changed". There any many cases where this >> information needs to be sent immediately, i.e. no time to wait for the n= ext >> report cycle. We can consider this to be an asynchronous report, or part= of >> a new "Event" flow. >> - Same for the mote asking the ME for a schedule update. >> >> Thoughts? >> >> Thomas >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: >>> >>> Xavi, >>> >>> Approach-(2) is more flexible and likely covers more situations. But, i= t >>> may bring some complexity to 6top, because 6top has to make decision on= the >>> bandwidth request (add/delete), which needs some metrics, some intellig= ence. >>> >>> What do you think? >>> >>> Qin >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> > w= rote: >>>> >>>> Hi Qin, I like your (2). >>>> >>>> Note also that there are situations that might have some differences. >>>> >>>> 1-the track already exists. >>>> 2-the track between the two entities does not exists >>>> >>>> in either case I think that the node that requires certain BW to anoth= er >>>> node should talk to 6top, which processes that request and sends a req= uest >>>> to the ME, the ME installs that new track. >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> X >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: >>>>> >>>>> Hi all, >>>>> >>>>> During today's call, we presented three control flows between >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Re= port >>>>> Flow, and started to talk about the 4th control flow. The thread will >>>>> continue the discussion about 4th flow. >>>>> >>>>> Here is the scenario: when a node finds that more cells are needed, >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be ab= le to >>>>> ask ME to install more bandwidth. >>>>> >>>>> I can see two approaches: >>>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRat= e >>>>> is a attribute in 6top. Then, ME can get the information via Query Fl= ow or >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>>> Request to ME, and then ME install more bandwidth. This is the 4th co= ntrol >>>>> flow. >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> >> -- >> Thomas Watteyne, Ph. D >> Sr. Networking Design Engineer >> Dust Networks / Linear Technology >> 30695 Huntwood Ave >> Hayward, CA 94544-7021 >> +1 (510) 400-2978 >> twatteyne@linear.com >> >> This e-mail transmission, and any documents, files or previous e-mail >> messages attached to it may contain confidential information that is leg= ally >> privileged. If you are not the intended recipient, or a person responsib= le >> for delivering it to the intended recipient, you are hereby notified tha= t >> any disclosure, copying, distribution or use of any of the information >> contained in or attached to this transmission is STRICTLY PROHIBITED. If= you >> have received this transmission in error, please immediately notify me b= y >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original >> transmission and its attachments without reading or saving in any manner= . >> Thank you. > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_F085911F642A6847987ADA23E611780D1858E56Fhoshiunilux_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Thomas, I believe that af= ter defining the message format for each flow,  we will have to addres= s the issue you have just raised up, i.e., the cells to be used for any kind of signaling traffic (i.e., add/delete cells, report traffic,= etc.).

    Even though we may start = using the slotted aloha schedule approach, in the future, we may think abou= t dedicated tracks, to be built according to the requirements of the schedule used for transferring the actual data traffic.<= /span>

    What do you think?

    Maria Rita

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 28, 2013 12:40 AM
    To: 6tsch@ietf.org
    Subject: Re: [6tsch] the 4th control flow

     

    Qin,

     

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in = the network, there will always need to be some cells installed for infrequent signaling traffic. If the report= rate is very slow, it might qualify as "infrequent signaling traffic&= quot;. For sure, the request to change the schedule qualifies.

     

    Isn't the answer draft-vilajosana-6tsch-basic? = That is, the slotted Aloha schedule indicated in the draft can be used for = the signaling traffic between the nodes and the ME. Of course, if the repor= t rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not thi= s early on.

     

    I agree with Diego that keeping the solution open to= different alternative is key.

     

    Thomas

     

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
          Alternative (1) adds delay to define the slots to send= the event
    to the ME (propagate the new schedule),
    while alternative (2)  keeps reserved slots waiting for the event to h= appen.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berk= eley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driven r= eport
    > is. I think we don't want to assume 6top sublayer is very intelligent,= in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is  when and how the bandw= idth for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosa= na@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control flows = between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf.org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (510) 400-2978<= /a>
    >>     twatteyne@linear.com >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_F085911F642A6847987ADA23E611780D1858E56Fhoshiunilux_-- From pthubert@cisco.com Wed Aug 28 04:33:27 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B0CA711E8177 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 04:33:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.548 X-Spam-Level: X-Spam-Status: No, score=-10.548 tagged_above=-999 required=5 tests=[AWL=0.050, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cZrDOUgS3iQR for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 04:33:23 -0700 (PDT) Received: from rcdn-iport-8.cisco.com (rcdn-iport-8.cisco.com [173.37.86.79]) by ietfa.amsl.com (Postfix) with ESMTP id 9A76311E8130 for <6tsch@ietf.org>; Wed, 28 Aug 2013 04:33:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=27717; q=dns/txt; s=iport; t=1377689602; x=1378899202; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=dEXq7J16hRF/zVaHpjvPW0wfV6qAv0TA58dyMZaPN7s=; b=d40Mv1NKA+KSKBbeTAtIufm7l3m5WayRMQpyil6aOggv/cJ9V+p7Ydv5 Tlzbbhy02UuigpQl9hYzKuPhoIEibPzLoig6FOLHGV6BIxb8/yHpnlKJf +oZkJ1W1vHuMvtYp7l4fY91q5vBkthPiIlhWj8+OA/iu0Nvcf18aBmgQh Y=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjcFAMneHVKtJXG//2dsb2JhbABYAw6CNUQ1UcApgSIWdIIkAQEBAwEBAQEkBhwlEAsCAQgRAQMBAQEKFgcHJwsUAwYIAgQBEggTh2AGDLkIjhoRgQghCwEKARGDC30DhUmDMqBXgmE/gXE5 X-IronPort-AV: E=Sophos;i="4.89,975,1367971200"; d="scan'208,217";a="252606995" Received: from rcdn-core2-4.cisco.com ([173.37.113.191]) by rcdn-iport-8.cisco.com with ESMTP; 28 Aug 2013 11:33:21 +0000 Received: from xhc-rcd-x10.cisco.com (xhc-rcd-x10.cisco.com [173.37.183.84]) by rcdn-core2-4.cisco.com (8.14.5/8.14.5) with ESMTP id r7SBXLIS017565 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 28 Aug 2013 11:33:21 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-rcd-x10.cisco.com ([173.37.183.84]) with mapi id 14.02.0318.004; Wed, 28 Aug 2013 06:33:20 -0500 From: "Pascal Thubert (pthubert)" To: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOo2nAaZ4Bv5ro3EeO2xuuRjGwi5mp5eKAgAATv4CAAIJEkA== Date: Wed, 28 Aug 2013 11:33:20 +0000 Deferred-Delivery: Wed, 28 Aug 2013 11:33:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.49.80.24] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD84142E769xmbrcdx01ciscoc_" MIME-Version: 1.0 Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 11:33:27 -0000 --_000_E045AECD98228444A58C61C200AE1BD84142E769xmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Thomas and all; If you refer to the industrial applicability statement, there is an expecta= tion that a very autonomic and solid RPL instance will span the network for= management purpose. In the architecture, we could mention that expectation and reserve an insta= nce number (0?) for the spanning management instance. This way, whatever users do on the other (data) instances, they will not br= eak the management instance and will always be able to reach the devices an= d manage them. Autonomic Networking does something similar... I do agree with Thomas that the basic support can be used to provide the ex= pected instance. The capability to increase dynamically the number of cells in a bundle woul= d be a great addition for the final solution, though. Cheers, Pascal From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: mercredi 28 ao=FBt 2013 00:40 To: 6tsch@ietf.org Subject: Re: [6tsch] the 4th control flow Qin, You bring up a good point: over what cells with the reports travel? Another= questions could be: over what cells will the request to install cells trav= el? I believe that, whatever the policy in place in the network, there will= always need to be some cells installed for infrequent signaling traffic. I= f the report rate is very slow, it might qualify as "infrequent signaling t= raffic". For sure, the request to change the schedule qualifies. Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha s= chedule indicated in the draft can be used for the signaling traffic betwee= n the nodes and the ME. Of course, if the report rate is very high, some de= dicate track might be installed, but I do not believe this is needed, certa= inly not this early on. I agree with Diego that keeping the solution open to different alternative = is key. Thomas On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne > wrote: Qin, Thomas, Alternative (1) adds delay to define the slots to send the event to the ME (propagate the new schedule), while alternative (2) keeps reserved slots waiting for the event to happen= . I think both alternatives should be included, and configured by the ME depe= nding on the network requirements. More thoughts? Diego Dujovne 2013/8/27 Qin Wang >: > Thomas, > > I agree with almost all. Only some comments on "Report Flow". > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-drive= n > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven repo= rt > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured b= y > ME, just like the interval of periodically report. Make sense? > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see. > (1) when a event is triggered, node sends a request to ME and ask some BW= to > send the report. I believe that is how the 4th control flow works. > (2) when ME configure the events and their triggers, ME also provisions s= ome > BW for the node which allows the node to send the report triggered by som= e > event. > > I have no strong opinion on which one is better. But, the bottom line is = the > configuration of the set of events and their triggers should be out of 6t= op > scope. Thought? > > Thanks > Qin > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: >> >> Qin, >> >> Please correct me if I'm wrong: >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typical >> commands are add/delete cells. >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> queries are about current cells usage or statistics. >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported >> information covers cells usage or statistics. >> >> Questions: >> - Looks like Query and Report flows contain the same information. In >> normal operation, the Report flow should be enough, the Query flow only >> being used in special cases, for example when the ME has lost state (jus= t >> booted, bug, etc). Agreed? >> - The ME should be able to configure the report flow. Configuration coul= d >> be "send report every X seconds" or "send report when variable X larger = than >> Y". I imagine this could be done over the action flow? Agreed? >> - A node will want to report an urgent event to the ME. One such events = is >> "the topology appears to have changed". There any many cases where this >> information needs to be sent immediately, i.e. no time to wait for the n= ext >> report cycle. We can consider this to be an asynchronous report, or part= of >> a new "Event" flow. >> - Same for the mote asking the ME for a schedule update. >> >> Thoughts? >> >> Thomas >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: >>> >>> Xavi, >>> >>> Approach-(2) is more flexible and likely covers more situations. But, i= t >>> may bring some complexity to 6top, because 6top has to make decision on= the >>> bandwidth request (add/delete), which needs some metrics, some intellig= ence. >>> >>> What do you think? >>> >>> Qin >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> > w= rote: >>>> >>>> Hi Qin, I like your (2). >>>> >>>> Note also that there are situations that might have some differences. >>>> >>>> 1-the track already exists. >>>> 2-the track between the two entities does not exists >>>> >>>> in either case I think that the node that requires certain BW to anoth= er >>>> node should talk to 6top, which processes that request and sends a req= uest >>>> to the ME, the ME installs that new track. >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> X >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: >>>>> >>>>> Hi all, >>>>> >>>>> During today's call, we presented three control flows between >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Re= port >>>>> Flow, and started to talk about the 4th control flow. The thread will >>>>> continue the discussion about 4th flow. >>>>> >>>>> Here is the scenario: when a node finds that more cells are needed, >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be ab= le to >>>>> ask ME to install more bandwidth. >>>>> >>>>> I can see two approaches: >>>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRat= e >>>>> is a attribute in 6top. Then, ME can get the information via Query Fl= ow or >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>>> Request to ME, and then ME install more bandwidth. This is the 4th co= ntrol >>>>> flow. >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> >> -- >> Thomas Watteyne, Ph. D >> Sr. Networking Design Engineer >> Dust Networks / Linear Technology >> 30695 Huntwood Ave >> Hayward, CA 94544-7021 >> +1 (510) 400-2978 >> twatteyne@linear.com >> >> This e-mail transmission, and any documents, files or previous e-mail >> messages attached to it may contain confidential information that is leg= ally >> privileged. If you are not the intended recipient, or a person responsib= le >> for delivering it to the intended recipient, you are hereby notified tha= t >> any disclosure, copying, distribution or use of any of the information >> contained in or attached to this transmission is STRICTLY PROHIBITED. If= you >> have received this transmission in error, please immediately notify me b= y >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original >> transmission and its attachments without reading or saving in any manner= . >> Thank you. > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD84142E769xmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hello Thomas and all;

     <= /p>

    If you refer to the indus= trial applicability statement, there is an expectation that a very autonomi= c and solid RPL instance will span the network for management purpose.

    In the architecture, we c= ould mention that expectation and reserve an instance number (0?) for the s= panning management instance.

     <= /p>

    This way, whatever users = do on the other (data) instances, they will not break the management instan= ce and will always be able to reach the devices and manage them.

    Autonomic Networking does= something similar…

     <= /p>

    I do agree with Thomas th= at the basic support can be used to provide the expected instance.

    The capability to increas= e dynamically the number of cells in a bundle would be a great addition for= the final solution, though.

     <= /p>

    Cheers,=

     <= /p>

    Pascal<= /p>

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: mercredi 28 ao=FBt 2013 00:40
    To: 6tsch@ietf.org
    Subject: Re: [6tsch] the 4th control flow

     

    Qin,

     

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in = the network, there will always need to be some cells installed for infrequent signaling traffic. If the report= rate is very slow, it might qualify as "infrequent signaling traffic&= quot;. For sure, the request to change the schedule qualifies.

     

    Isn't the answer draft-vilajosana-6tsch-basic? = That is, the slotted Aloha schedule indicated in the draft can be used for = the signaling traffic between the nodes and the ME. Of course, if the repor= t rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not thi= s early on.

     

    I agree with Diego that keeping the solution open to= different alternative is key.

     

    Thomas

     

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
          Alternative (1) adds delay to define the slots to send= the event
    to the ME (propagate the new schedule),
    while alternative (2)  keeps reserved slots waiting for the event to h= appen.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berk= eley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driven r= eport
    > is. I think we don't want to assume 6top sublayer is very intelligent,= in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is  when and how the bandw= idth for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosa= na@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control flows = between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf.org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (510) 400-2978<= /a>
    >>     twatteyne@linear.com >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_E045AECD98228444A58C61C200AE1BD84142E769xmbrcdx01ciscoc_-- From P.Zand@utwente.nl Wed Aug 28 04:55:43 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 13E2B21F994C for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 04:55:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lVM2YXEZ7khP for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 04:55:42 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 8822D21F9935 for <6tsch@ietf.org>; Wed, 28 Aug 2013 04:55:36 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Wed, 28 Aug 2013 13:55:30 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Wed, 28 Aug 2013 13:55:27 +0200 From: To: , <6tsch@ietf.org> Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWD//+R/gIAAIcgA///iD4CAABkTAIADNlmggATgRgCAASNqIIAAqJmAgAEGRFCAAImCAIALgp+A Date: Wed, 28 Aug 2013 11:55:26 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/mixed; boundary="_007_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379EXMBX23adutwent_" MIME-Version: 1.0 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 11:55:43 -0000 --_007_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379EXMBX23adutwent_ Content-Type: multipart/related; boundary="_006_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379EXMBX23adutwent_"; type="multipart/alternative" --_006_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379EXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379EXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379EXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear All, I would like to continue our discussion for choosing the time source (eithe= r in L2 or L3) in the basic RPL. I prepared a sample of message sequence chart to show the potential procedu= re for basic RPL. I think we can refer to or modify the attached slide to discuss the details= for constructing the basic RPL, as well as choosing the time source. Best Wishes, Pouria [cid:image001.jpg@01CEA3F6.3D6E3C80] From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Wednesday, August 21, 2013 7:45 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Glad to read we agree! Thomas On Tue, Aug 20, 2013 at 12:53 PM, > wrote: Thomas, Many thanks for your explanation. I couldn't find the related counter in MAC PIB of IEEE 802.15.4. My first idea was using both (a) clock accuracy information and (b) RPL ran= k information for choosing the best timing parent between two routers with = equal (or close) RPL rank. That would help us to avoid (1) synchronization = loop problem and (2) potential drifting problem caused by choosing the pare= nt, between two with equal ranks but not equal clock accuracy. As you mentioned, let's not make it complicated and consider the parent ran= k as a factor for choosing the timing parent. Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Tuesday, August 20, 2013 7:54 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Thanks for the explanation. Allow me to answer inline. Thomas On Mon, Aug 19, 2013 at 10:57 AM, > wrote: Thomas, I am not expert in synchronization, so please bear with me. By clock accuracy information, I mean how accurate a node can maintain (e.g= . =B11 ms) synchronization in the network for a period of time (e.g. 20 s) = without the need for clock update. Different devices might have different c= lock accuracy values represent by parts per million (ppm) unit. The clock a= ccuracy of a device might depend on the device' environment conditions (e.g= . temperature or shocks) and it doesn't just depend on crystals hardware. A= m I right? Agreed. I am used to the term "clock drift" for the phenomenon, but absolut= ely, drift depends on manufacturing, voltage, temperature, and probably oth= er environmental factors. The amount of drift of your clock source will dic= tate how often resynchronization needs to happen, given a guard time (i.e. = 1ms). Of course, all these parameters depend on each other, so you can imag= ine buying a better clock source, or changing the re-synchronization freque= ncy, or changing the guard time. In the centralized approach, the System/Network managers, use (L2) device = clock accuracy information as well as (L3) nodes' topology information (sim= ilar to node's rank in RPL in 6tsch distributed approach) to select the pot= ential clock sources in the network. Am I right? Hmm. I understand what you are proposing, but my first reaction is to be a = bit afraid that basing time source neighbor selection on clock drift inform= ation might lead to lots of complexity, for not much gain (I think). If I a= m drifting a lot wrt to my neighbor, could I not resolve that locally (thro= ugh all kind of techniques we can think of), rather than involving the time= source neighbor selection process in that? In a distributed approach, a network device might inform their neighbors a= bout its (L2) clock accuracy. A new device might use this information, as w= ell as L3 parameters (e.g. sender RPL' rank), to choose its timing parent. This would certainly invert the approach. Now, we let RPL select routing pa= rents, and then we have TSCH just use the same. If we go the other way arou= nd, i.e. select time source neighbors, then routes, many things will get co= mplicated real quick, the first of which are synchronization loops. If in 6tsch, we are considering the case that all the nodes in the network= have equal high clock accuracy, then let's consider (L3) router's rank, ba= sed on the default OF (as Raghuram suggest), as the only factor for selecti= ng timing parent. I would go that route, but maybe you have some counter example in mind? Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Monday, August 19, 2013 4:28 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, all, My 2c is the following. We already agreed on the fact that a mote's (RPL) r= outing parent would also be its (TSCH) time source neighbor. So why not pic= k the time source neighbor based on routing information? What exactly do you mean by clock accuracy? All nodes in a TSCH network nee= d to be able to synchronize with one another, and I don't think we are cons= idering cases where that is not true. Thomas On Thu, Aug 15, 2013 at 3:07 PM, > wrote: Raghuram, I agree with you that we need a method to pick a timing parent. We might need the L3 information on that, unless we can find a solution in = 6top to use L2 information. For example about the clock accuracy capabiliti= es of the device who has already joined the network. I am not sure if this = information is available in L2 and neighbor table. Best Wishes, Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Wednesday, August 14, 2013 12:57 AM To: xvilajosana@eecs.berkeley.edu; Za= nd, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang Subject: Re: [6tsch] RPL on Basic Xavi, Pouria, I think we need to keep node rank at 6top (as a read only parameter obtaine= d from L3) in order for the TSCH nodes to figure out the timing parent. In = the case where RPL node may have different ranks based on different OFs we = need a method to pick a timing parent. We should propose a default OF, that is used to compute the ranks for the p= urpose finding the timing parent. -raghuram From: Xavier Vilajosana Guillen > Reply-To: > Date: Tuesday, August 13, 2013 2:27 PM To: Pouria Zand > Cc: Thomas Watteyne >, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang = > Subject: Re: [6tsch] RPL on Basic Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, > wrote: Xavi, I guess we cannot keep "node rank" in the 6top. Because a node might have d= ifferent rank based on different metrics defined in L3. As a response, I do= n't think we can get all of those information form L3 and use them in neigh= bor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379EXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Dear All,

    I would like to continue = our discussion for choosing the time source (either in L2 or L3) in the bas= ic RPL.

    I prepared a sample of me= ssage sequence chart to show the potential procedure for basic RPL.

    I think we can refer to o= r modify the attached slide to discuss the details for constructing the bas= ic RPL, as well as choosing the time source.

    Best Wishes,

    Pouria  <= /span>

    =

     <= /p>

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 21, 2013 7:45 AM
    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Glad to read we agree!

    Thomas

     

    On Tue, Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    Many thanks for your explanation.

    I couldn’t find the related count= er in MAC PIB of IEEE 802.15.4.

     

    My first idea was using both (a) clock = accuracy information and (b) RPL rank information for choosing the best timing parent between two routers with equal (or close) RPL rank.= That would help us to avoid (1) synchronization loop problem and (2) poten= tial drifting problem caused by choosing the parent, between two with equal= ranks but not equal clock accuracy.

     

    As you mentioned, let’s not make = it complicated and consider the parent rank as a factor for choosing the timing parent.

     

    Pouria.

          &nb= sp;

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Thanks for the explanation. Allow me to answer inline.<= /p>

    Thomas

     

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    I am not expert in synchronization, so = please bear with me.

     

    By clock accuracy information, I mean h= ow accurate a node can maintain (e.g. =B11 ms) synchronization in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device’ environment conditions (e.g. temperature or shocks) and it doesn’t just depend o= n crystals hardware. Am I right?

     

    Agreed. I am used to the term "clock drift" for the phen= omenon, but absolutely, drift depends on manufacturing, voltage, temperatur= e, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronizat= ion needs to happen, given a guard time (i.e. 1ms). Of course, all these pa= rameters depend on each other, so you can imagine buying a better clock sou= rce, or changing the re-synchronization frequency, or changing the guard time.

     

     In the centralized approach, the = System/Network managers, use (L2) device clock accuracy information as well as (L3) nodes’ topology information (similar to node’s= rank in RPL in 6tsch distributed approach) to select the potential clock s= ources in the network. Am I right? 

     

    Hmm. I understand what you are proposing, but my first reaction is= to be a bit afraid that basing time source neighbor selection on clock dri= ft information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my = neighbor, could I not resolve that locally (through all kind of techniques = we can think of), rather than involving the time source neighbor selection = process in that?

     

     In a distributed approach, a netw= ork device might inform their neighbors about its (L2) clock accuracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL’ rank), to choose its timing parent.

     

    This would certainly invert the approach. Now, we let RPL select r= outing parents, and then we have TSCH just use the same. If we go the other= way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the f= irst of which are synchronization loops.

     

     If in 6tsch, we are considering t= he case that all the nodes in the network have equal high clock accuracy, then let’s consider (L3) router’s rank, based on the= default OF (as Raghuram suggest), as the only factor for selecting = timing parent.

     

    I would go that route, but maybe you have some counter example in = mind?

     

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

     

    Pouria, all,

     

    My 2c is the following. We already agreed on the fact that a mote'= s (RPL) routing parent would also be its (TSCH) time source neighbor. So wh= y not pick the time source neighbor based on routing information?

     

    What exactly do you mean by clock accuracy? All nodes in a TSCH ne= twork need to be able to synchronize with one another, and I don't think we= are considering cases where that is not true.

     

    Thomas

     

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:

    Raghuram,

    I agree with you that we need a method to pick a timi= ng parent.

    We might need the L3 information on that, unless we c= an find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

     

    From: Raghuram Sudhaakar (rs= udhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

     

    Xavi, Pouria,

    I think we need to keep node rank at 6top (as a read = only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

     

    We should propose a default OF, that is used to compu= te the ranks for the purpose finding the timing parent.

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

     

    Good point :-)

    agreed!
    X

     

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    I guess we cannot keep “node rank= ” in the 6top. Because a node might have different rank based on different metrics defined in L3. As a response, I don’t think we can= get all of those information form L3 and use them in neighbor table in 6to= p. Am I right?

    I think, as you mentioned we need to wo= rk on them.

     

    Pouria  

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Many thanks for your complete explanati= on. It absolutely makes sense.

     

    Just one minor question. The neighbor t= able will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?

    there are many different ways to implement that, this is an= option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about connect= ivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your description. Besides, there isn't a c= ommon shared cell to send KAs. I see the operation in the following way:

    6top KA timer expires and places a KA packet into the queue (e.g this ha= ppens every 30s). TSCH layer at the begining of a shared tx/rx slot then re= ads from the queue and sends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation us= ing Neighbors information described in Basic configuration.

        -this includes how = OF is calculated using numTx and numTxACK, etc..

     

    []

    -RPL configuration:<= /p>

         - storing mod= e vs non-storing mode (I vote for non-storing mode for a basic configuratio= n)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


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tagged_above=-999 required=5 tests=[AWL=0.043, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6XCn9e5o7bzr for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 05:05:45 -0700 (PDT) Received: from rcdn-iport-6.cisco.com (rcdn-iport-6.cisco.com [173.37.86.77]) by ietfa.amsl.com (Postfix) with ESMTP id 5907511E8132 for <6tsch@ietf.org>; Wed, 28 Aug 2013 05:05:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=30834; q=dns/txt; s=iport; t=1377691545; x=1378901145; h=from:to:subject:date:message-id:references:in-reply-to: mime-version; bh=kf9CyncJmy2iCJZj4LV7je2h13fmPv08YdMOFPoBXVU=; b=CvQ+foq1XKKl2/JB5fKCCW8L0jYxifNZbQr4s8xugo31UD9cbo3yklV1 3vDJpJXqPkhnC5iDBTcKjMWuHognFfWFOMDDT4Gv9vD+1shqNgfc1cEcT witvqvApCt2XJ9f3oyejTcQoMjDm4dakSg4gHoFrWIGN8tyG7i2qJT/1b I=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AkIFAD7nHVKtJV2Y/2dsb2JhbABYAw6CNUQ1UcAqgSIWdIIkAQEBAwEBAQEkBhwlEAsCAQgRBAEBAQoWBwcnCxQJCAIEAQkJCBOHYAYMuHyOGhGBCCELAQEJAQYLgwt9A4VJgzKgV4JhP4FxOQ X-IronPort-AV: E=Sophos;i="4.89,975,1367971200"; d="scan'208,217";a="252636582" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by rcdn-iport-6.cisco.com with ESMTP; 28 Aug 2013 12:05:43 +0000 Received: from xhc-rcd-x08.cisco.com (xhc-rcd-x08.cisco.com [173.37.183.82]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id r7SC5hu5016069 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 28 Aug 2013 12:05:43 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-rcd-x08.cisco.com ([173.37.183.82]) with mapi id 14.02.0318.004; Wed, 28 Aug 2013 07:05:42 -0500 From: "Pascal Thubert (pthubert)" To: Maria Rita PALATTELLA , Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOo2nA37SuPY1UNUSxyNbir/bk6pmpcIqAgAATvoCAANTQwIAAJNxQ Date: Wed, 28 Aug 2013 12:05:42 +0000 Deferred-Delivery: Wed, 28 Aug 2013 12:05:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.49.80.24] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD84142E7F8xmbrcdx01ciscoc_" MIME-Version: 1.0 Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 12:05:53 -0000 --_000_E045AECD98228444A58C61C200AE1BD84142E7F8xmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Maria Rita: There are also schemas that could allow to dynamically adapt the amount of = cells in a bundle between 2 peer routers with a few control bits piggy-back= ed with the existing traffic. Such schema would avoid the need for out-of-band control traffic and avoid = the problem of pre allocating slots for that purpose. In the simplest case, we would allocate a peak n number of time slots for a= bundle but signal with a control bit whether the next slot is actually fre= e in which case both sender and receiver would sleep at that time. By defau= lt the devices would send/receive every p [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyne Sent: Wednesday, August 28, 2013 12:40 AM To: 6tsch@ietf.org Subject: Re: [6tsch] the 4th control flow Qin, You bring up a good point: over what cells with the reports travel? Another= questions could be: over what cells will the request to install cells trav= el? I believe that, whatever the policy in place in the network, there will= always need to be some cells installed for infrequent signaling traffic. I= f the report rate is very slow, it might qualify as "infrequent signaling t= raffic". For sure, the request to change the schedule qualifies. Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha s= chedule indicated in the draft can be used for the signaling traffic betwee= n the nodes and the ME. Of course, if the report rate is very high, some de= dicate track might be installed, but I do not believe this is needed, certa= inly not this early on. I agree with Diego that keeping the solution open to different alternative = is key. Thomas On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne > wrote: Qin, Thomas, Alternative (1) adds delay to define the slots to send the event to the ME (propagate the new schedule), while alternative (2) keeps reserved slots waiting for the event to happen= . I think both alternatives should be included, and configured by the ME depe= nding on the network requirements. More thoughts? Diego Dujovne 2013/8/27 Qin Wang >: > Thomas, > > I agree with almost all. Only some comments on "Report Flow". > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-drive= n > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven repo= rt > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured b= y > ME, just like the interval of periodically report. Make sense? > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see. > (1) when a event is triggered, node sends a request to ME and ask some BW= to > send the report. I believe that is how the 4th control flow works. > (2) when ME configure the events and their triggers, ME also provisions s= ome > BW for the node which allows the node to send the report triggered by som= e > event. > > I have no strong opinion on which one is better. But, the bottom line is = the > configuration of the set of events and their triggers should be out of 6t= op > scope. Thought? > > Thanks > Qin > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: >> >> Qin, >> >> Please correct me if I'm wrong: >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typical >> commands are add/delete cells. >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> queries are about current cells usage or statistics. >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported >> information covers cells usage or statistics. >> >> Questions: >> - Looks like Query and Report flows contain the same information. In >> normal operation, the Report flow should be enough, the Query flow only >> being used in special cases, for example when the ME has lost state (jus= t >> booted, bug, etc). Agreed? >> - The ME should be able to configure the report flow. Configuration coul= d >> be "send report every X seconds" or "send report when variable X larger = than >> Y". I imagine this could be done over the action flow? Agreed? >> - A node will want to report an urgent event to the ME. One such events = is >> "the topology appears to have changed". There any many cases where this >> information needs to be sent immediately, i.e. no time to wait for the n= ext >> report cycle. We can consider this to be an asynchronous report, or part= of >> a new "Event" flow. >> - Same for the mote asking the ME for a schedule update. >> >> Thoughts? >> >> Thomas >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: >>> >>> Xavi, >>> >>> Approach-(2) is more flexible and likely covers more situations. But, i= t >>> may bring some complexity to 6top, because 6top has to make decision on= the >>> bandwidth request (add/delete), which needs some metrics, some intellig= ence. >>> >>> What do you think? >>> >>> Qin >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> > w= rote: >>>> >>>> Hi Qin, I like your (2). >>>> >>>> Note also that there are situations that might have some differences. >>>> >>>> 1-the track already exists. >>>> 2-the track between the two entities does not exists >>>> >>>> in either case I think that the node that requires certain BW to anoth= er >>>> node should talk to 6top, which processes that request and sends a req= uest >>>> to the ME, the ME installs that new track. >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> X >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: >>>>> >>>>> Hi all, >>>>> >>>>> During today's call, we presented three control flows between >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Re= port >>>>> Flow, and started to talk about the 4th control flow. The thread will >>>>> continue the discussion about 4th flow. >>>>> >>>>> Here is the scenario: when a node finds that more cells are needed, >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be ab= le to >>>>> ask ME to install more bandwidth. >>>>> >>>>> I can see two approaches: >>>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRat= e >>>>> is a attribute in 6top. Then, ME can get the information via Query Fl= ow or >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>>> Request to ME, and then ME install more bandwidth. This is the 4th co= ntrol >>>>> flow. >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> >> -- >> Thomas Watteyne, Ph. D >> Sr. Networking Design Engineer >> Dust Networks / Linear Technology >> 30695 Huntwood Ave >> Hayward, CA 94544-7021 >> +1 (510) 400-2978 >> twatteyne@linear.com >> >> This e-mail transmission, and any documents, files or previous e-mail >> messages attached to it may contain confidential information that is leg= ally >> privileged. If you are not the intended recipient, or a person responsib= le >> for delivering it to the intended recipient, you are hereby notified tha= t >> any disclosure, copying, distribution or use of any of the information >> contained in or attached to this transmission is STRICTLY PROHIBITED. If= you >> have received this transmission in error, please immediately notify me b= y >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original >> transmission and its attachments without reading or saving in any manner= . >> Thank you. > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD84142E7F8xmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hello Maria Rita:

     <= /p>

    There are also schemas th= at could allow to dynamically adapt the amount of cells in a bundle between= 2 peer routers with a few control bits piggy-backed with the existing traffic.

    Such schema would avoid t= he need for out-of-band control traffic and avoid the problem of pre alloca= ting slots for that purpose.

     <= /p>

    In the simplest case, we = would allocate a peak n number of time slots for a bundle but signal with a= control bit whether the next slot is actually free in which case both sender and receiver would sleep at that time. By default the dev= ices would send/receive every p <n but if a burst of traffic or addition= al retries require so, the co-next slot would be activated.

     <= /p>

    For instance with p =3D 1= and n =3D 4 we can quadruple the throughput at peak time.

     <= /p>

    What do you think?

     <= /p>

    Pascal

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Maria Rita PALATTELLA
    Sent: mercredi 28 ao=FBt 2013 11:38
    To: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] the 4th control flow

     

    Thomas, I believe that af= ter defining the message format for each flow,  we will have to addres= s the issue you have just raised up, i.e., the cells to be used for any kind of signaling traffic (i.e., add/delete cells, report traffic,= etc.).

    Even though we may start = using the slotted aloha schedule approach, in the future, we may think abou= t dedicated tracks, to be built according to the requirements of the schedule used for transferring the actual data traffic.<= /span>

    What do you think?

    Maria Rita

     <= /p>

    From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 28, 2013 12:40 AM
    To: 6tsch@ietf.org
    Subject: Re: [6tsch] the 4th control flow

     

    Qin,

     

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in = the network, there will always need to be some cells installed for infrequent signaling traffic. If the report= rate is very slow, it might qualify as "infrequent signaling traffic&= quot;. For sure, the request to change the schedule qualifies.

     

    Isn't the answer draft-vilajosana-6tsch-basic? = That is, the slotted Aloha schedule indicated in the draft can be used for = the signaling traffic between the nodes and the ME. Of course, if the repor= t rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not thi= s early on.

     

    I agree with Diego that keeping the solution open to= different alternative is key.

     

    Thomas

     

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
          Alternative (1) adds delay to define the slots to send= the event
    to the ME (propagate the new schedule),
    while alternative (2)  keeps reserved slots waiting for the event to h= appen.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berk= eley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driven r= eport
    > is. I think we don't want to assume 6top sublayer is very intelligent,= in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is  when and how the bandw= idth for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosa= na@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control flows = between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf.org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (510) 400-2978<= /a>
    >>     twatteyne@linear.com >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

    --_000_E045AECD98228444A58C61C200AE1BD84142E7F8xmbrcdx01ciscoc_-- From qinwang@berkeley.edu Wed Aug 28 07:51:31 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EFCF311E811F for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 07:51:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.916 X-Spam-Level: X-Spam-Status: No, score=-2.916 tagged_above=-999 required=5 tests=[AWL=0.060, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id m4lsUQ5-H5ET for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 07:51:22 -0700 (PDT) Received: from mail-vc0-f176.google.com (mail-vc0-f176.google.com [209.85.220.176]) by ietfa.amsl.com (Postfix) with ESMTP id 8B97121F84E3 for <6tsch@ietf.org>; Wed, 28 Aug 2013 07:51:22 -0700 (PDT) Received: by mail-vc0-f176.google.com with SMTP id ha11so4162810vcb.35 for <6tsch@ietf.org>; Wed, 28 Aug 2013 07:51:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=cNtgvKPufpJXaVGVyA4yGzh6mJCblbOaHSCKPc7wWCQ=; b=Yky5PLcSrIit0FFFSeYRg8Wx47c0mIygmI0hF7fYhfTCPhSpxH1rAiW9GJEJcgIE+/ jbD4STM8XdO2AHnhFv4cLVj8qBFaEt6d9Hm4X4NlaOYoqm/4MQZjNKhunZWrSMvo8S2U qs29LNNMhwQp2jwys+i6r1zrnbgQCLQf4JiMyVa3vf9NFdIPEretHDBYeay8yZ8XP6f1 f+B8+7mp0RN8LniFyn1VKVLuKGpNu1CXwa6Mkk11KORZBv6eYhtQh0RqtP8/PS3CpreC QcmKmJMExSugoAtBbmd31loK21BxeD7PitUyUHlzvMV6PfqMMQA5DBMzW61ErXoRQMYQ G3Aw== X-Gm-Message-State: ALoCoQkLNNp+ucRjhTjkEC1nFAVYAemQ0EUQ7MLJnYscomd2srH8TI0SB3KkhJruwHX0lLhX3xrI MIME-Version: 1.0 X-Received: by 10.52.73.162 with SMTP id m2mr11740564vdv.24.1377701481825; Wed, 28 Aug 2013 07:51:21 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Wed, 28 Aug 2013 07:51:21 -0700 (PDT) In-Reply-To: References: Date: Wed, 28 Aug 2013 22:51:21 +0800 Message-ID: From: Qin Wang To: "Pascal Thubert (pthubert)" Content-Type: multipart/alternative; boundary=bcaec50162296e56a104e5031f1a Cc: Maria Rita PALATTELLA , Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 14:51:35 -0000 --bcaec50162296e56a104e5031f1a Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Pascal, I think your "a few control bits piggy-backed with the existing traffic" is a good idea. Over-provision can increase the throughput at peak time, while the control bits can reduce the energy consumption for idle-listening (at least at the beginning of slot) in those unused Tx/Rx cells. Xavi and Thomas, I think the method can be used to save energy in our over-provision case, event that is for improving link quality. What do you think? Thanks Qin On Wed, Aug 28, 2013 at 8:05 PM, Pascal Thubert (pthubert) < pthubert@cisco.com> wrote: > Hello Maria Rita:**** > > ** ** > > There are also schemas that could allow to dynamically adapt the amount o= f > cells in a bundle between 2 peer routers with a few control bits > piggy-backed with the existing traffic.**** > > Such schema would avoid the need for out-of-band control traffic and avoi= d > the problem of pre allocating slots for that purpose. **** > > ** ** > > In the simplest case, we would allocate a peak n number of time slots for > a bundle but signal with a control bit whether the next slot is actually > free in which case both sender and receiver would sleep at that time. By > default the devices would send/receive every p or additional retries require so, the co-next slot would be activated. **= * > * > > ** ** > > For instance with p =3D 1 and n =3D 4 we can quadruple the throughput at = peak > time.**** > > ** ** > > What do you think?**** > > ** ** > > Pascal**** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Maria Rita PALATTELLA > *Sent:* mercredi 28 ao=FBt 2013 11:38 > *To:* Thomas Watteyne; 6tsch@ietf.org > > *Subject:* Re: [6tsch] the 4th control flow**** > > ** ** > > Thomas, I believe that after defining the message format for each flow, > we will have to address the issue you have just raised up, i.e., the cel= ls > to be used for any kind of signaling traffic (i.e., add/delete cells, > report traffic, etc.).**** > > Even though we may start using the slotted aloha schedule approach, in th= e > future, we may think about dedicated tracks, to be built according to the > requirements of the schedule used for transferring the actual data traffi= c. > **** > > What do you think? **** > > Maria Rita **** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org<6tsch-bounc= es@ietf.org>] > *On Behalf Of *Thomas Watteyne > *Sent:* Wednesday, August 28, 2013 12:40 AM > *To:* 6tsch@ietf.org > *Subject:* Re: [6tsch] the 4th control flow**** > > ** ** > > Qin,**** > > ** ** > > You bring up a good point: over what cells with the reports travel? > Another questions could be: over what cells will the request to install > cells travel? I believe that, whatever the policy in place in the network= , > there will always need to be some cells installed for infrequent signalin= g > traffic. If the report rate is very slow, it might qualify as "infrequent > signaling traffic". For sure, the request to change the schedule qualifie= s. > **** > > ** ** > > Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha > schedule indicated in the draft can be used for the signaling traffic > between the nodes and the ME. Of course, if the report rate is very high, > some dedicate track might be installed, but I do not believe this is > needed, certainly not this early on.**** > > ** ** > > I agree with Diego that keeping the solution open to different alternativ= e > is key.**** > > ** ** > > Thomas**** > > ** ** > > On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne < > diego.dujovne@mail.udp.cl> wrote:**** > > Qin, Thomas, > Alternative (1) adds delay to define the slots to send the event > to the ME (propagate the new schedule), > while alternative (2) keeps reserved slots waiting for the event to > happen. > I think both alternatives should be included, and configured by the ME > depending > on the network requirements. > > More thoughts? > > Diego Dujovne > > 2013/8/27 Qin Wang :**** > > > Thomas, > > > > I agree with almost all. Only some comments on "Report Flow". > > > > As you mentioned, there are two kinds of report scenarios, one is > > periodically report, another one is burst report or called as > event-driven > > report. I have no question on how periodically report works, which you > > described. But I'm not sure what the best way to handle event-driven > report > > is. I think we don't want to assume 6top sublayer is very intelligent, = in > > another word, the events and the trigger of events should be configured > by > > ME, just like the interval of periodically report. Make sense? > > > > If you agree to it, the remained issue is when and how the bandwidth f= or > > sending event-driven reports is reserved. Here are two ways I can see. > > (1) when a event is triggered, node sends a request to ME and ask some > BW to > > send the report. I believe that is how the 4th control flow works. > > (2) when ME configure the events and their triggers, ME also provisions > some > > BW for the node which allows the node to send the report triggered by > some > > event. > > > > I have no strong opinion on which one is better. But, the bottom line i= s > the > > configuration of the set of events and their triggers should be out of > 6top > > scope. Thought? > > > > Thanks > > Qin > > > > > > > > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: > >> > >> Qin, > >> > >> Please correct me if I'm wrong: > >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typica= l > >> commands are add/delete cells. > >> - Query Flow (ME->6top). ME asks 6top for some information. Typical > >> queries are about current cells usage or statistics. > >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical report= ed > >> information covers cells usage or statistics. > >> > >> Questions: > >> - Looks like Query and Report flows contain the same information. In > >> normal operation, the Report flow should be enough, the Query flow onl= y > >> being used in special cases, for example when the ME has lost state > (just > >> booted, bug, etc). Agreed? > >> - The ME should be able to configure the report flow. Configuration > could > >> be "send report every X seconds" or "send report when variable X large= r > than > >> Y". I imagine this could be done over the action flow? Agreed? > >> - A node will want to report an urgent event to the ME. One such event= s > is > >> "the topology appears to have changed". There any many cases where thi= s > >> information needs to be sent immediately, i.e. no time to wait for the > next > >> report cycle. We can consider this to be an asynchronous report, or > part of > >> a new "Event" flow. > >> - Same for the mote asking the ME for a schedule update. > >> > >> Thoughts? > >> > >> Thomas > >> > >> > >> > >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: > >>> > >>> Xavi, > >>> > >>> Approach-(2) is more flexible and likely covers more situations. But, > it > >>> may bring some complexity to 6top, because 6top has to make decision > on the > >>> bandwidth request (add/delete), which needs some metrics, some > intelligence. > >>> > >>> What do you think? > >>> > >>> Qin > >>> > >>> > >>> > >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen > >>> wrote: > >>>> > >>>> Hi Qin, I like your (2). > >>>> > >>>> Note also that there are situations that might have some differences= . > >>>> > >>>> 1-the track already exists. > >>>> 2-the track between the two entities does not exists > >>>> > >>>> in either case I think that the node that requires certain BW to > another > >>>> node should talk to 6top, which processes that request and sends a > request > >>>> to the ME, the ME installs that new track. > >>>> > >>>> does it make sense. Do you see any drawback on that approach? > >>>> > >>>> X > >>>> > >>>> > >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: > >>>>> > >>>>> Hi all, > >>>>> > >>>>> During today's call, we presented three control flows between > >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and > Report > >>>>> Flow, and started to talk about the 4th control flow. The thread wi= ll > >>>>> continue the discussion about 4th flow. > >>>>> > >>>>> Here is the scenario: when a node finds that more cells are needed, > >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be > able to > >>>>> ask ME to install more bandwidth. > >>>>> > >>>>> I can see two approaches: > >>>>> (1) Managed by ME, without 4th Control Flow. Assume > BandwidthUsageRate > >>>>> is a attribute in 6top. Then, ME can get the information via Query > Flow or > >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. > >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth > >>>>> Request to ME, and then ME install more bandwidth. This is the 4th > control > >>>>> flow. > >>>>> > >>>>> What do you think? Which one makes more sense? > >>>>> > >>>>> Qin > >>>>> > >>>>> > >>>>> > >>>>> _______________________________________________ > >>>>> 6tsch mailing list > >>>>> 6tsch@ietf.org > >>>>> https://www.ietf.org/mailman/listinfo/6tsch > >>>>> > >>>> > >>> > >>> > >>> _______________________________________________ > >>> 6tsch mailing list > >>> 6tsch@ietf.org > >>> https://www.ietf.org/mailman/listinfo/6tsch > >>> > >> > >> > >> > >> -- > >> Thomas Watteyne, Ph. D > >> Sr. Networking Design Engineer > >> Dust Networks / Linear Technology > >> 30695 Huntwood Ave > >> Hayward, CA 94544-7021 > >> +1 (510) 400-2978 > >> twatteyne@linear.com > >> > >> This e-mail transmission, and any documents, files or previous e-mail > >> messages attached to it may contain confidential information that is > legally > >> privileged. If you are not the intended recipient, or a person > responsible > >> for delivering it to the intended recipient, you are hereby notified > that > >> any disclosure, copying, distribution or use of any of the information > >> contained in or attached to this transmission is STRICTLY PROHIBITED. > If you > >> have received this transmission in error, please immediately notify me > by > >> reply e-mail, or by telephone at (510) 400-2978, and destroy the > original > >> transmission and its attachments without reading or saving in any > manner. > >> Thank you. > > > > > > > > _______________________________________________ > > 6tsch mailing list > > 6tsch@ietf.org > > https://www.ietf.org/mailman/listinfo/6tsch > > > > > > --**** > > DIEGO DUJOVNE > Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones > Facultad de Ingenier=EDa UDP > www.ingenieria.udp.cl > (56 2) 676 8125**** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --bcaec50162296e56a104e5031f1a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Pascal,

    I think your "a= few control bits piggy-backed with the existing traffic" is a = good idea. Over-provision can increase the throughput at peak time, while t= he control bits can reduce the energy consumption for idle-listening (at le= ast at the beginning of slot) in those unused Tx/Rx cells.

    Xavi and Thomas, I think the method can be used to save= energy in our over-provision case, event that is for improving link qualit= y. What do you think?

    Thanks
    Qin


    On Wed,= Aug 28, 2013 at 8:05 PM, Pascal Thubert (pthubert) <<= a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisco.com> wrote:

    Hello Maria Rita:

    =A0<= /p>

    There are also schemas th= at could allow to dynamically adapt the amount of cells in a bundle between= 2 peer routers with a few control bits piggy-backed with the existing traffic.

    Such schema would avoid t= he need for out-of-band control traffic and avoid the problem of pre alloca= ting slots for that purpose.

    =A0<= /p>

    In the simplest case, we = would allocate a peak n number of time slots for a bundle but signal with a= control bit whether the next slot is actually free in which case both sender and receiver would sleep at that time. By default the dev= ices would send/receive every p <n but if a burst of traffic or addition= al retries require so, the co-next slot would be activated.

    =A0<= /p>

    For instance with p =3D 1= and n =3D 4 we can quadruple the throughput at peak time.

    =A0<= /p>

    What do you think?=

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Maria Rita PALATTELLA
    Sent: mercredi 28 ao=FBt 2013 11:38
    To: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] the 4th control flow
    <= p>

    =A0

    Thomas, I believe that af= ter defining the message format for each flow, =A0we will have to address t= he issue you have just raised up, i.e., the cells to be used for any kind of signaling traffic (i.e., add/delete cells, report traffic,= etc.).

    Even though we may start = using the slotted aloha schedule approach, in the future, we may think abou= t dedicated tracks, to be built according to the requirements of the schedule used for transferring the actual data traffic.

    What do you think?

    Maria Rita

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [ma= ilto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 28, 2013 12:40 AM
    To: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] the 4th control flow

    =A0

    Qin,

    =A0

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in = the network, there will always need to be some cells installed for infrequent signaling traffic. If the report= rate is very slow, it might qualify as "infrequent signaling traffic&= quot;. For sure, the request to change the schedule qualifies.

    =A0

    Isn't the answer=A0draft-vilajosana-6tsch-basic?= That is, the slotted Aloha schedule indicated in the draft can be used for= the signaling traffic between the nodes and the ME. Of course, if the repo= rt rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not thi= s early on.

    =A0

    I agree with Diego that keeping the solution open to= different alternative is key.

    =A0

    Thomas

    =A0

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
    =A0 =A0 =A0 Alternative (1) adds delay to define the slots to send the even= t
    to the ME (propagate the new schedule),
    while alternative (2) =A0keeps reserved slots waiting for the event to happ= en.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driv= en report
    > is. I think we don't want to assume 6top sublayer is very intellig= ent, in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is =A0when and how the bandwidt= h for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control fl= ows between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (= 510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125=

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
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    --bcaec50162296e56a104e5031f1a-- From qinwang@berkeley.edu Wed Aug 28 08:00:14 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 26B4621F9FE3 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 08:00:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.918 X-Spam-Level: X-Spam-Status: No, score=-2.918 tagged_above=-999 required=5 tests=[AWL=0.058, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w7rM7nYzYi9c for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 07:59:53 -0700 (PDT) Received: from mail-vc0-f180.google.com (mail-vc0-f180.google.com [209.85.220.180]) by ietfa.amsl.com (Postfix) with ESMTP id 2344C21F8C7C for <6tsch@ietf.org>; Wed, 28 Aug 2013 07:59:52 -0700 (PDT) Received: by mail-vc0-f180.google.com with SMTP id gf11so4250701vcb.11 for <6tsch@ietf.org>; Wed, 28 Aug 2013 07:59:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=yTsJFst8KvBsm9aQcd2KJ4o5/u5LZSYpFa0O7tzqxvg=; b=cdRoBknFxFb91WNlC8dBf2lQx3fzMmaO8gJxOq2kCLvJ4+CwgZpD2g7BmVkLWe46ZU 3LcV+GvFh32GY4+CVr8hszo6p4skE+a1xQfJ4T2pJMmsm+lppDubYJaIBpDzGS/jvd6j xLIJjVYtuwYuKm01Eu7N9ObUbsfoby4tCl6BP8j99Bw/eJplShSGDp0y0m9PQXeNgxYF zBdGHlQiLsPhzFrJChjXC1vtjVGXJ/VBjWdzPQHBdQ+OLi16gHIawLJ3YOFQfZjirlxw +nULxykimtXicUKD5o4zpyy/5JQG1/pqw5HjuYXQSWvdHR3+jCpy6d3QYPV2Xz+cNLL9 Ox5A== X-Gm-Message-State: ALoCoQkpq7MK/x8TLPWh0bMAOJwtRx7RR3UvD4yGdshDBhdqqCTjBxdxpFP7wTmHV/MNbqD1jrn0 MIME-Version: 1.0 X-Received: by 10.52.170.232 with SMTP id ap8mr554933vdc.40.1377701983823; Wed, 28 Aug 2013 07:59:43 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Wed, 28 Aug 2013 07:59:43 -0700 (PDT) In-Reply-To: References: Date: Wed, 28 Aug 2013 22:59:43 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=047d7b6d7aae5a372b04e5033d73 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 15:00:15 -0000 --047d7b6d7aae5a372b04e5033d73 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thomas, I agree to keep different alternatives, at lease as options. Regarding to what kinds of cells should be used for conveying the report, shared cells or dedicated cells, I would like to leave them to configuration. What do you think? Thanks Qin On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne wrote: > Qin, > > You bring up a good point: over what cells with the reports travel? > Another questions could be: over what cells will the request to install > cells travel? I believe that, whatever the policy in place in the network= , > there will always need to be some cells installed for infrequent signalin= g > traffic. If the report rate is very slow, it might qualify as "infrequent > signaling traffic". For sure, the request to change the schedule qualifie= s. > > Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha > schedule indicated in the draft can be used for the signaling traffic > between the nodes and the ME. Of course, if the report rate is very high, > some dedicate track might be installed, but I do not believe this is > needed, certainly not this early on. > > I agree with Diego that keeping the solution open to different alternativ= e > is key. > > Thomas > > > On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne < > diego.dujovne@mail.udp.cl> wrote: > >> Qin, Thomas, >> Alternative (1) adds delay to define the slots to send the event >> to the ME (propagate the new schedule), >> while alternative (2) keeps reserved slots waiting for the event to >> happen. >> I think both alternatives should be included, and configured by the ME >> depending >> on the network requirements. >> >> More thoughts? >> >> Diego Dujovne >> >> 2013/8/27 Qin Wang : >> > Thomas, >> > >> > I agree with almost all. Only some comments on "Report Flow". >> > >> > As you mentioned, there are two kinds of report scenarios, one is >> > periodically report, another one is burst report or called as >> event-driven >> > report. I have no question on how periodically report works, which you >> > described. But I'm not sure what the best way to handle event-driven >> report >> > is. I think we don't want to assume 6top sublayer is very intelligent, >> in >> > another word, the events and the trigger of events should be configure= d >> by >> > ME, just like the interval of periodically report. Make sense? >> > >> > If you agree to it, the remained issue is when and how the bandwidth >> for >> > sending event-driven reports is reserved. Here are two ways I can see. >> > (1) when a event is triggered, node sends a request to ME and ask some >> BW to >> > send the report. I believe that is how the 4th control flow works. >> > (2) when ME configure the events and their triggers, ME also provision= s >> some >> > BW for the node which allows the node to send the report triggered by >> some >> > event. >> > >> > I have no strong opinion on which one is better. But, the bottom line >> is the >> > configuration of the set of events and their triggers should be out of >> 6top >> > scope. Thought? >> > >> > Thanks >> > Qin >> > >> > >> > >> > >> > >> > >> > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne >> > wrote: >> >> >> >> Qin, >> >> >> >> Please correct me if I'm wrong: >> >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typic= al >> >> commands are add/delete cells. >> >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> >> queries are about current cells usage or statistics. >> >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical >> reported >> >> information covers cells usage or statistics. >> >> >> >> Questions: >> >> - Looks like Query and Report flows contain the same information. In >> >> normal operation, the Report flow should be enough, the Query flow on= ly >> >> being used in special cases, for example when the ME has lost state >> (just >> >> booted, bug, etc). Agreed? >> >> - The ME should be able to configure the report flow. Configuration >> could >> >> be "send report every X seconds" or "send report when variable X >> larger than >> >> Y". I imagine this could be done over the action flow? Agreed? >> >> - A node will want to report an urgent event to the ME. One such >> events is >> >> "the topology appears to have changed". There any many cases where th= is >> >> information needs to be sent immediately, i.e. no time to wait for th= e >> next >> >> report cycle. We can consider this to be an asynchronous report, or >> part of >> >> a new "Event" flow. >> >> - Same for the mote asking the ME for a schedule update. >> >> >> >> Thoughts? >> >> >> >> Thomas >> >> >> >> >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang >> wrote: >> >>> >> >>> Xavi, >> >>> >> >>> Approach-(2) is more flexible and likely covers more situations. But= , >> it >> >>> may bring some complexity to 6top, because 6top has to make decision >> on the >> >>> bandwidth request (add/delete), which needs some metrics, some >> intelligence. >> >>> >> >>> What do you think? >> >>> >> >>> Qin >> >>> >> >>> >> >>> >> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >> >>> wrote: >> >>>> >> >>>> Hi Qin, I like your (2). >> >>>> >> >>>> Note also that there are situations that might have some difference= s. >> >>>> >> >>>> 1-the track already exists. >> >>>> 2-the track between the two entities does not exists >> >>>> >> >>>> in either case I think that the node that requires certain BW to >> another >> >>>> node should talk to 6top, which processes that request and sends a >> request >> >>>> to the ME, the ME installs that new track. >> >>>> >> >>>> does it make sense. Do you see any drawback on that approach? >> >>>> >> >>>> X >> >>>> >> >>>> >> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang >> wrote: >> >>>>> >> >>>>> Hi all, >> >>>>> >> >>>>> During today's call, we presented three control flows between >> >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and >> Report >> >>>>> Flow, and started to talk about the 4th control flow. The thread >> will >> >>>>> continue the discussion about 4th flow. >> >>>>> >> >>>>> Here is the scenario: when a node finds that more cells are needed= , >> >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be >> able to >> >>>>> ask ME to install more bandwidth. >> >>>>> >> >>>>> I can see two approaches: >> >>>>> (1) Managed by ME, without 4th Control Flow. Assume >> BandwidthUsageRate >> >>>>> is a attribute in 6top. Then, ME can get the information via Query >> Flow or >> >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >> >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >> >>>>> Request to ME, and then ME install more bandwidth. This is the 4th >> control >> >>>>> flow. >> >>>>> >> >>>>> What do you think? Which one makes more sense? >> >>>>> >> >>>>> Qin >> >>>>> >> >>>>> >> >>>>> >> >>>>> _______________________________________________ >> >>>>> 6tsch mailing list >> >>>>> 6tsch@ietf.org >> >>>>> https://www.ietf.org/mailman/listinfo/6tsch >> >>>>> >> >>>> >> >>> >> >>> >> >>> _______________________________________________ >> >>> 6tsch mailing list >> >>> 6tsch@ietf.org >> >>> https://www.ietf.org/mailman/listinfo/6tsch >> >>> >> >> >> >> >> >> >> >> -- >> >> Thomas Watteyne, Ph. D >> >> Sr. Networking Design Engineer >> >> Dust Networks / Linear Technology >> >> 30695 Huntwood Ave >> >> Hayward, CA 94544-7021 >> >> +1 (510) 400-2978 >> >> twatteyne@linear.com >> >> >> >> This e-mail transmission, and any documents, files or previous e-mail >> >> messages attached to it may contain confidential information that is >> legally >> >> privileged. If you are not the intended recipient, or a person >> responsible >> >> for delivering it to the intended recipient, you are hereby notified >> that >> >> any disclosure, copying, distribution or use of any of the informatio= n >> >> contained in or attached to this transmission is STRICTLY PROHIBITED. >> If you >> >> have received this transmission in error, please immediately notify m= e >> by >> >> reply e-mail, or by telephone at (510) 400-2978, and destroy the >> original >> >> transmission and its attachments without reading or saving in any >> manner. >> >> Thank you. >> > >> > >> > >> > _______________________________________________ >> > 6tsch mailing list >> > 6tsch@ietf.org >> > https://www.ietf.org/mailman/listinfo/6tsch >> > >> >> >> >> -- >> DIEGO DUJOVNE >> Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicacione= s >> Facultad de Ingenier=EDa UDP >> www.ingenieria.udp.cl >> (56 2) 676 8125 >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b6d7aae5a372b04e5033d73 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Thomas,

    I agree to keep different alter= natives, at lease as options.

    Regarding to what ki= nds of cells should be used for conveying the report, shared cells or dedic= ated cells, I would like to leave them to configuration. What do you think?=

    Thanks
    Qin



    On Wed, Aug 28, 2013 = at 6:39 AM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    You= bring up a good point: over what cells with the reports travel? Another qu= estions could be: over what cells will the request to install cells travel?= I believe that, whatever the policy in place in the network, there will al= ways need to be some cells installed for infrequent signaling traffic. If t= he report rate is very slow, it might qualify as "infrequent signaling= traffic". For sure, the request to change the schedule qualifies.

    Isn't the answer=A0draft-vilajosana-6tsch-basic? Th= at is, the slotted Aloha schedule indicated in the draft can be used for th= e signaling traffic between the nodes and the ME. Of course, if the report = rate is very high, some dedicate track might be installed, but I do not bel= ieve this is needed, certainly not this early on.

    I agree with Diego that keeping the solution open to di= fferent alternative is key.

    Thomas


    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne <diego.d= ujovne@mail.udp.cl> wrote:
    Qin, Thomas,
    =A0 =A0 =A0 Alternative (1) adds delay to define the slots to send the even= t
    to the ME (propagate the new schedule),
    while alternative (2) =A0keeps reserved slots waiting for the event to happ= en.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:
    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driv= en report
    > is. I think we don't want to assume 6top sublayer is very intellig= ent, in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is =A0when and how the bandwidt= h for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control fl= ows between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destro= y the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


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    --047d7b6d7aae5a372b04e5033d73-- From qinwang@berkeley.edu Wed Aug 28 08:31:27 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 97B2811E8191 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 08:31:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.92 X-Spam-Level: X-Spam-Status: No, score=-2.92 tagged_above=-999 required=5 tests=[AWL=0.056, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SqjmZlN95ICB for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 08:31:23 -0700 (PDT) Received: from mail-vb0-f44.google.com (mail-vb0-f44.google.com [209.85.212.44]) by ietfa.amsl.com (Postfix) with ESMTP id A19A611E81AF for <6tsch@ietf.org>; Wed, 28 Aug 2013 08:31:22 -0700 (PDT) Received: by mail-vb0-f44.google.com with SMTP id e13so4148249vbg.17 for <6tsch@ietf.org>; Wed, 28 Aug 2013 08:31:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=jZTmY6wkXVzNoeorVklskoThFHIDGJ3SVVgMypldksQ=; b=FWRqWdEJyChBL/OjgryTpJTQG387oK22injToSrnX9IWlo4LFSbXxjQ/cDJ5TIhQGo W5c0B6FiZf2OuI/7v8SW5LOZDou0YtDdP8qVr+vao2VLbczPg1CMU3kiNHompqeY2TPR +G2CwyzIy15V9n33XfWeeeSFyKYzvf4r3EhXxMzN5uFTS8xO2sz8dksEzNJ2gk9O/Irj mt2/ZJ/HSQalRezzlosfIsX/OtjpMEdmoiYYOnYrpmUqACQMXFLRdkOEiSGYhPpgNQv7 CWFDYd9/irxKq8n5UEd9B1GaKSMaXOxmvjslSyMbjMGgn4+73INNHXqYO1DB2hG1ZW1k /Nmg== X-Gm-Message-State: ALoCoQmqAKKfnSwmqCrZtUTPAP7V03386P1iflwZYwpjJk7twizoZmIoDAA/R90T+7zTDAv86Ac2 MIME-Version: 1.0 X-Received: by 10.220.237.208 with SMTP id kp16mr26050804vcb.4.1377703881994; Wed, 28 Aug 2013 08:31:21 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Wed, 28 Aug 2013 08:31:21 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> Date: Wed, 28 Aug 2013 23:31:21 +0800 Message-ID: From: Qin Wang To: "P.Zand@utwente.nl" Content-Type: multipart/related; boundary=047d7b3434647e05b404e503ae73 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 15:31:27 -0000 --047d7b3434647e05b404e503ae73 Content-Type: multipart/alternative; boundary=047d7b3434647e05b204e503ae72 --047d7b3434647e05b204e503ae72 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pouria, It is great to have the diagram as common base to discuss. I would like to add "Changing time source" along with "Choosing the RPL parent", because the time source selected at the beginning is just a temporary one, and time source in L2 should be same as the RPL parent in L3 after RPL parent is selected. make sense? Qin On Wed, Aug 28, 2013 at 7:55 PM, wrote: > Dear All,**** > > I would like to continue our discussion for choosing the time source > (either in L2 or L3) in the basic RPL. **** > > I prepared a sample of message sequence chart to show the potential > procedure for basic RPL.**** > > I think we can refer to or modify the attached slide to discuss the > details for constructing the basic RPL, as well as choosing the time sour= ce. > **** > > Best Wishes,**** > > Pouria **** > > **** > > ** ** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Wednesday, August 21, 2013 7:45 AM > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Pouria,**** > > Glad to read we agree!**** > > Thomas**** > > ** ** > > On Tue, Aug 20, 2013 at 12:53 PM, wrote:**** > > Thomas,**** > > **** > > Many thanks for your explanation.**** > > I couldn=92t find the related counter in MAC PIB of IEEE 802.15.4.**** > > **** > > My first idea was using both (a) clock accuracy information and (b) RPL > rank information for choosing the best timing parent between two routers > with equal (or close) RPL rank. That would help us to avoid (1) > synchronization loop problem and (2) potential drifting problem caused by > choosing the parent, between two with equal ranks but not equal clock > accuracy.**** > > **** > > As you mentioned, let=92s not make it complicated and consider the parent > rank as a factor for choosing the timing parent.**** > > **** > > Pouria.**** > > **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Tuesday, August 20, 2013 7:54 AM**** > > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria,**** > > Thanks for the explanation. Allow me to answer inline.**** > > Thomas**** > > **** > > On Mon, Aug 19, 2013 at 10:57 AM, wrote:**** > > Thomas,**** > > **** > > I am not expert in synchronization, so please bear with me.**** > > **** > > By clock accuracy information, I mean how accurate a node can maintain > (e.g. =B11 ms) synchronization in the network for a period of time (e.g. = 20 > s) without the need for clock update. Different devices might have > different clock accuracy values represent by parts per million (ppm) unit= . > The clock accuracy of a device might depend on the device=92 environment > conditions (e.g. temperature or shocks) and it doesn=92t just depend on > crystals hardware. Am I right?**** > > **** > > Agreed. I am used to the term "clock drift" for the phenomenon, but > absolutely, drift depends on manufacturing, voltage, temperature, and > probably other environmental factors. The amount of drift of your clock > source will dictate how often resynchronization needs to happen, given a > guard time (i.e. 1ms). Of course, all these parameters depend on each > other, so you can imagine buying a better clock source, or changing the > re-synchronization frequency, or changing the guard time.**** > > **** > > In the centralized approach, the System/Network managers, use (L2) > device clock accuracy information as well as (L3) nodes=92 topology > information (similar to node=92s rank in RPL in 6tsch distributed approac= h) > to select the potential clock sources in the network. Am I right? **** > > **** > > Hmm. I understand what you are proposing, but my first reaction is to be = a > bit afraid that basing time source neighbor selection on clock drift > information might lead to lots of complexity, for not much gain (I think)= . > If I am drifting a lot wrt to my neighbor, could I not resolve that local= ly > (through all kind of techniques we can think of), rather than involving t= he > time source neighbor selection process in that?**** > > **** > > In a distributed approach, a network device might inform their > neighbors about its (L2) clock accuracy. A new device might use this > information, as well as L3 parameters (e.g. sender RPL=92 rank), to choos= e > its timing parent.**** > > **** > > This would certainly invert the approach. Now, we let RPL select routing > parents, and then we have TSCH just use the same. If we go the other way > around, i.e. select time source neighbors, then routes, many things will > get complicated real quick, the first of which are synchronization loops.= * > *** > > **** > > If in 6tsch, we are considering the case that all the nodes in the > network have equal high clock accuracy, then let=92s consider (L3) router= =92s > rank, based on the *default OF* (as Raghuram suggest), as the only factor > for selecting timing parent.**** > > **** > > I would go that route, but maybe you have some counter example in mind?*= * > ** > > **** > > Pouria**** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Monday, August 19, 2013 4:28 AM > *To:* 6TSCH**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria, all,**** > > **** > > My 2c is the following. We already agreed on the fact that a mote's (RPL) > routing parent would also be its (TSCH) time source neighbor. So why not > pick the time source neighbor based on routing information?**** > > **** > > What exactly do you mean by clock accuracy? All nodes in a TSCH network > need to be able to synchronize with one another, and I don't think we are > considering cases where that is not true.**** > > **** > > Thomas**** > > **** > > On Thu, Aug 15, 2013 at 3:07 PM, wrote:**** > > Raghuram,**** > > I agree with you that we need a method to pick a timing parent.**** > > We might need the L3 information on that, unless we can find a solution i= n > 6top to use L2 information. For example about the clock accuracy > capabilities of the device who has already joined the network. I am not > sure if this information is available in L2 and neighbor table.**** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] > *Sent:* Wednesday, August 14, 2013 12:57 AM > *To:* xvilajosana@eecs.berkeley.edu; Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org; Qin Wang**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Xavi, Pouria,**** > > I think we need to keep node rank at 6top (as a read only parameter > obtained from L3) in order for the TSCH nodes to figure out the timing > parent. In the case where RPL node may have different ranks based on > different OFs we need a method to pick a timing parent.**** > > **** > > We should propose a default OF, that is used to compute the ranks for the > purpose finding the timing parent.**** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: * > *Date: *Tuesday, August 13, 2013 2:27 PM > *To: *Pouria Zand > *Cc: *Thomas Watteyne , "6tsch@ietf.org" < > 6tsch@ietf.org>, Qin Wang > *Subject: *Re: [6tsch] RPL on Basic**** > > **** > > Good point :-)**** > > agreed! > X**** > > **** > > On Tue, Aug 13, 2013 at 2:20 PM, wrote:**** > > Xavi,**** > > **** > > I guess we cannot keep =93node rank=94 in the 6top. Because a node might = have > different rank based on different metrics defined in L3. As a response, I > don=92t think we can get all of those information form L3 and use them in > neighbor table in 6top. Am I right? **** > > I think, as you mentioned we need to work on them. **** > > **** > > Pouria **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 11:13 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria, > > yes the neighbor table is something that 6top takes care of. The fields o= f > the table is something that we need to work on, stats for sure as describ= ed > by the basic configuration draft. As regards to the rank, in our > implementation, we keep it in the table, for each neighbour we keep its > rank. This information can be placed somewhere else if you want but I gue= ss > we need it to keep some sense on what is the rank of our neighbors.**** > > regards,**** > > Xavi**** > > **** > > **** > > On Tue, Aug 13, 2013 at 2:05 PM, wrote:**** > > Xavi,**** > > **** > > Many thanks for your complete explanation. It absolutely makes sense.**** > > **** > > Just one minor question. The neighbor table will be stored in 6top. Am I > right? If yes, do we need to store rank information (included in DIO) in > that table? Or we just store neighbor statistic?**** > > **** > > Pouria **** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 10:17 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > answer inline:**** > > Xavi,**** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > there are many different ways to implement that, this is an option.**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI?**** > > These are the list of known neighbors with acceptable RSSI, so yes if it > wants to keep all of them.**** > > Or (2) the node should probe its connection with the its RPL parent and > its RPL child? In the case (2), how does the 6top can inform the L3 about > the new potential discovered neighbors and their connection status? **** > > When a node is discovered due to receiving and EB (at least in our openws= n > implementation), it is inserted at the neighbor table. At that point no > information about connectivity can be used except RSSI. As soon as a DIO = is > received from that node, its information is updated (including rank). As = we > don't have any information about connectivity (as RFC6552 describes) an > initial value is set (i.e rank + FOO). In openwsn a similar case to (1) i= s > used so eventually some stats of the link can be used to compute the ETX > and let RPL do its work. **** > > So RPL knows about a new node because 6TOP keeps information of neighbors > an eventually this information is used by RPL to update routes. As this > node sends DIOs and receives DIOs from others the information is > permanently being updated enabling a node to be positioned in the multiho= p > topology.**** > > Does it make sense?**** > > Pouria**** > > **** > > On Tue, Aug 13, 2013 at 12:40 PM, wrote:**** > > Xavi,**** > > **** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > **** > > Pouria**** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > **** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:*6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > **** > > **** > > **** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b3434647e05b204e503ae72 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pouria,

    It is great to have the diag= ram as common base to discuss. I would like to add "Changing time sour= ce" along with "Choosing the RPL parent", because the time s= ource selected at the beginning is just a temporary one, and time source in= L2 should be same as the RPL parent in L3 after RPL parent is selected.

    make sense?

    Qin
    =A0<= /div>


    On= Wed, Aug 28, 2013 at 7:55 PM, <P.Zand@utwente.nl> wrote:

    Dear All,

    I would like to continue = our discussion for choosing the time source (either in L2 or L3) in the bas= ic RPL.

    I prepared a sample of me= ssage sequence chart to show the potential procedure for basic RPL.<= u>

    I think we can refer to o= r modify the attached slide to discuss the details for constructing the bas= ic RPL, as well as choosing the time source.

    Best Wishes,

    Pouria =A0<= /span>

    =A0<= /p>

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 21, 2013 7:45 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    Glad to read we agree!

    Thomas

    =A0

    On Tue, Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,<= /u>

    =A0<= /p>

    Many thanks for your expl= anation.

    I couldn=92t find the rel= ated counter in MAC PIB of IEEE 802.15.4.

    =A0<= /p>

    My first idea was using b= oth (a) clock accuracy information and (b) RPL rank information for choosin= g the best timing parent between two routers with equal (or close) RPL rank.= That would help us to avoid (1) synchronization loop problem and (2) poten= tial drifting problem caused by choosing the parent, between two with equal= ranks but not equal clock accuracy.

    =A0<= /p>

    As you mentioned, let=92s= not make it complicated and consider the parent rank as a factor for choos= ing the timing parent.

    =A0<= /p>

    Pouria.<= /u>

    =A0=A0=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    Thanks for the explanation. Allow me to answer inlin= e.

    Thomas

    =A0

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,<= /u>

    =A0<= /p>

    I am not expert in synchr= onization, so please bear with me.

    =A0<= /p>

    By clock accuracy informa= tion, I mean how accurate a node can maintain (e.g. =B11 ms) synchronizatio= n in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device=92 environment conditions (e.g. temperature or shocks) and it doesn=92t just depend on cr= ystals hardware. Am I right?

    =A0

    Agreed. I am used to the term "clock drift"= ; for the phenomenon, but absolutely, drift depends on manufacturing, volta= ge, temperature, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronizat= ion needs to happen, given a guard time (i.e. 1ms). Of course, all these pa= rameters depend on each other, so you can imagine buying a better clock sou= rce, or changing the re-synchronization frequency, or changing the guard time.

    =A0

    =A0In the centralized app= roach, the System/Network managers, use (L2) device clock accuracy informat= ion as well as (L3) nodes=92 topology information (similar to node=92s rank in= RPL in 6tsch distributed approach) to select the potential clock sources i= n the network. Am I right?=A0

    =A0

    Hmm. I understand what you are proposing, but my fir= st reaction is to be a bit afraid that basing time source neighbor selectio= n on clock drift information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my = neighbor, could I not resolve that locally (through all kind of techniques = we can think of), rather than involving the time source neighbor selection = process in that?

    =A0

    =A0In a distributed appro= ach, a network device might inform their neighbors about its (L2) clock acc= uracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL=92 rank), to choose its timing parent.

    =A0

    This would certainly invert the approach. Now, we le= t RPL select routing parents, and then we have TSCH just use the same. If w= e go the other way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the f= irst of which are synchronization loops.

    =A0

    =A0If in 6tsch, we are co= nsidering the case that all the nodes in the network have equal high clock accuracy, then let=92s consider (L3) router=92s rank, based on the defa= ult OF (as Raghuram suggest), as the only factor for selecting timing p= arent.

    =A0<= /p>

    I would go that route, but maybe you have some count= er example in mind?

    =A0

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria, all,

    =A0

    My 2c is the following. We already agreed on the fac= t that a mote's (RPL) routing parent would also be its (TSCH) time sour= ce neighbor. So why not pick the time source neighbor based on routing information?

    =A0

    What exactly do you mean by clock accuracy? All node= s in a TSCH network need to be able to synchronize with one another, and I = don't think we are considering cases where that is not true.

    =A0

    Thomas

    =A0

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:=

    Raghuram,

    I agree with you that we need a method = to pick a timing parent.

    We might need the L3 information on tha= t, unless we can find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Raghuram= Sudhaakar (rsudhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Xavi, Pouria,

    I think we need to keep node rank at 6t= op (as a read only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

    =A0

    We should propose a default OF, that is= used to compute the ranks for the purpose finding the timing parent.

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Good poi= nt :-)

    agreed!
    X

    =A0

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl&= gt; wrote:

    Xavi,

    =A0<= /p>

    I guess we cannot keep = =93node rank=94 in the 6top. Because a node might have different rank based= on different metrics defined in L3. As a response, I don=92t think we can get= all of those information form L3 and use them in neighbor table in 6top. A= m I right?

    I think, as you mentioned= we need to work on them.

    =A0<= /p>

    Pouria =A0<= u>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

    =A0

    =A0

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:=

    Xavi,

    =A0<= /p>

    Many thanks for your comp= lete explanation. It absolutely makes sense.

    =A0<= /p>

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    answer inline:=

    Xavi,

    Keep Alive timer expires for =93node A=94 aft= er 30s if no frames have been sent (or received) to (or from) neighbor =93n= ode B=94. Am I right?

    there are many different ways to implement that, this is an= option.

    =A0

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about con= nectivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

    =A0

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or from) neighbor =93node B=94. Am I right?

    =A0<= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status? =A0=A0=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the= following way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.=

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From:6tsch-bounces@ietf.org= [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchron= ized with its RPL parent. In the absence of traffic, the node will periodic= ally "keep alive" (per Xavi's e-mail) to the parent. How ofte= n depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:<= u>

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function = calculation using Neighbors information described in Basic configuration.

    =A0=A0=A0 -this includes= how OF is calculated using numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing m= ode vs non-storing mode (I vote for non-storing mode for a basic configurat= ion)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


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tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fdi7hlhfokQN for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 09:53:01 -0700 (PDT) Received: from EXEDGE01.ad.utwente.nl (exedge01.ad.utwente.nl [130.89.5.48]) by ietfa.amsl.com (Postfix) with ESMTP id 3620B11E8274 for <6tsch@ietf.org>; Wed, 28 Aug 2013 09:52:53 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE01.ad.utwente.nl (130.89.5.48) with Microsoft SMTP Server (TLS) id 14.2.328.9; Wed, 28 Aug 2013 18:52:55 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Wed, 28 Aug 2013 18:52:52 +0200 From: To: Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWD//+R/gIAAIcgA///iD4CAABkTAIADNlmggATgRgCAASNqIIAAqJmAgAEGRFCAAImCAIALgp+AgAAhcYCAADXHQA== Date: Wed, 28 Aug 2013 16:52:51 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661E@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/mixed; boundary="_008_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661EEXMBX23adutwent_" MIME-Version: 1.0 Cc: watteyne@eecs.berkeley.edu, 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 16:53:02 -0000 --_008_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661EEXMBX23adutwent_ Content-Type: multipart/related; boundary="_007_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661EEXMBX23adutwent_"; type="multipart/alternative" --_007_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661EEXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661EEXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661EEXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Qin, I changed the diagram based on your comment. However, I couldn't conclude form the discussion on "time parent selection = based on EB priority" thread to find out, if L3 will make the final decisio= n about the time source or L2. Best Wishes, Pouria [cid:image001.jpg@01CEA41F.C82480E0] From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Wednesday, August 28, 2013 5:31 PM To: Zand, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, It is great to have the diagram as common base to discuss. I would like to = add "Changing time source" along with "Choosing the RPL parent", because th= e time source selected at the beginning is just a temporary one, and time s= ource in L2 should be same as the RPL parent in L3 after RPL parent is sele= cted. make sense? Qin On Wed, Aug 28, 2013 at 7:55 PM, > wrote: Dear All, I would like to continue our discussion for choosing the time source (eithe= r in L2 or L3) in the basic RPL. I prepared a sample of message sequence chart to show the potential procedu= re for basic RPL. I think we can refer to or modify the attached slide to discuss the details= for constructing the basic RPL, as well as choosing the time source. Best Wishes, Pouria [cid:image004.jpg@01CEA41F.8D6F8300] From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Wednesday, August 21, 2013 7:45 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Glad to read we agree! Thomas On Tue, Aug 20, 2013 at 12:53 PM, > wrote: Thomas, Many thanks for your explanation. I couldn't find the related counter in MAC PIB of IEEE 802.15.4. My first idea was using both (a) clock accuracy information and (b) RPL ran= k information for choosing the best timing parent between two routers with = equal (or close) RPL rank. That would help us to avoid (1) synchronization = loop problem and (2) potential drifting problem caused by choosing the pare= nt, between two with equal ranks but not equal clock accuracy. As you mentioned, let's not make it complicated and consider the parent ran= k as a factor for choosing the timing parent. Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Tuesday, August 20, 2013 7:54 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Thanks for the explanation. Allow me to answer inline. Thomas On Mon, Aug 19, 2013 at 10:57 AM, > wrote: Thomas, I am not expert in synchronization, so please bear with me. By clock accuracy information, I mean how accurate a node can maintain (e.g= . =B11 ms) synchronization in the network for a period of time (e.g. 20 s) = without the need for clock update. Different devices might have different c= lock accuracy values represent by parts per million (ppm) unit. The clock a= ccuracy of a device might depend on the device' environment conditions (e.g= . temperature or shocks) and it doesn't just depend on crystals hardware. A= m I right? Agreed. I am used to the term "clock drift" for the phenomenon, but absolut= ely, drift depends on manufacturing, voltage, temperature, and probably oth= er environmental factors. The amount of drift of your clock source will dic= tate how often resynchronization needs to happen, given a guard time (i.e. = 1ms). Of course, all these parameters depend on each other, so you can imag= ine buying a better clock source, or changing the re-synchronization freque= ncy, or changing the guard time. In the centralized approach, the System/Network managers, use (L2) device = clock accuracy information as well as (L3) nodes' topology information (sim= ilar to node's rank in RPL in 6tsch distributed approach) to select the pot= ential clock sources in the network. Am I right? Hmm. I understand what you are proposing, but my first reaction is to be a = bit afraid that basing time source neighbor selection on clock drift inform= ation might lead to lots of complexity, for not much gain (I think). If I a= m drifting a lot wrt to my neighbor, could I not resolve that locally (thro= ugh all kind of techniques we can think of), rather than involving the time= source neighbor selection process in that? In a distributed approach, a network device might inform their neighbors a= bout its (L2) clock accuracy. A new device might use this information, as w= ell as L3 parameters (e.g. sender RPL' rank), to choose its timing parent. This would certainly invert the approach. Now, we let RPL select routing pa= rents, and then we have TSCH just use the same. If we go the other way arou= nd, i.e. select time source neighbors, then routes, many things will get co= mplicated real quick, the first of which are synchronization loops. If in 6tsch, we are considering the case that all the nodes in the network= have equal high clock accuracy, then let's consider (L3) router's rank, ba= sed on the default OF (as Raghuram suggest), as the only factor for selecti= ng timing parent. I would go that route, but maybe you have some counter example in mind? Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Monday, August 19, 2013 4:28 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, all, My 2c is the following. We already agreed on the fact that a mote's (RPL) r= outing parent would also be its (TSCH) time source neighbor. So why not pic= k the time source neighbor based on routing information? What exactly do you mean by clock accuracy? All nodes in a TSCH network nee= d to be able to synchronize with one another, and I don't think we are cons= idering cases where that is not true. Thomas On Thu, Aug 15, 2013 at 3:07 PM, > wrote: Raghuram, I agree with you that we need a method to pick a timing parent. We might need the L3 information on that, unless we can find a solution in = 6top to use L2 information. For example about the clock accuracy capabiliti= es of the device who has already joined the network. I am not sure if this = information is available in L2 and neighbor table. Best Wishes, Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Wednesday, August 14, 2013 12:57 AM To: xvilajosana@eecs.berkeley.edu; Za= nd, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang Subject: Re: [6tsch] RPL on Basic Xavi, Pouria, I think we need to keep node rank at 6top (as a read only parameter obtaine= d from L3) in order for the TSCH nodes to figure out the timing parent. In = the case where RPL node may have different ranks based on different OFs we = need a method to pick a timing parent. We should propose a default OF, that is used to compute the ranks for the p= urpose finding the timing parent. -raghuram From: Xavier Vilajosana Guillen > Reply-To: > Date: Tuesday, August 13, 2013 2:27 PM To: Pouria Zand > Cc: Thomas Watteyne >, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang = > Subject: Re: [6tsch] RPL on Basic Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, > wrote: Xavi, I guess we cannot keep "node rank" in the 6top. Because a node might have d= ifferent rank based on different metrics defined in L3. As a response, I do= n't think we can get all of those information form L3 and use them in neigh= bor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661EEXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hi Qin,=

    I changed the diagram bas= ed on your comment.

    However, I couldn’t= conclude form the discussion on “time parent selection based on EB p= riority” thread to find out, if L3 will make the final decision about the time source or L2.

    Best Wishes,

    Pouria<= /p>

     <= /p>

    From: Qin Wang= [mailto:qinwang@berkeley.edu]
    Sent: Wednesday, August 28, 2013 5:31 PM
    To: Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

     

    It is great to have the diagram as common base to di= scuss. I would like to add "Changing time source" along with &quo= t;Choosing the RPL parent", because the time source selected at the be= ginning is just a temporary one, and time source in L2 should be same as the RPL parent in L3 after RPL parent is selected.<= /o:p>

     

    make sense?

     

    Qin

     

     

    On Wed, Aug 28, 2013 at 7:55 PM, <P.Zand@utwente.nl> wrote:

    Dear All,

    I would like to continue our discussion= for choosing the time source (either in L2 or L3) in the basic RPL.

    I prepared a sample of message sequence= chart to show the potential procedure for basic RPL.

    I think we can refer to or modify the a= ttached slide to discuss the details for constructing the basic RPL, as well as choosing the time source.

    Best Wishes,

    Pouria  

     

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 21, 2013 7:45 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Glad to read we agree!

    Thomas

     

    On Tue, Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    Many thanks for your explanation.

    I couldn’t find the related count= er in MAC PIB of IEEE 802.15.4.

     

    My first idea was using both (a) clock = accuracy information and (b) RPL rank information for choosing the best timing parent between two routers with equal (or close) RPL rank.= That would help us to avoid (1) synchronization loop problem and (2) poten= tial drifting problem caused by choosing the parent, between two with equal= ranks but not equal clock accuracy.

     

    As you mentioned, let’s not make = it complicated and consider the parent rank as a factor for choosing the timing parent.

     

    Pouria.

          &nb= sp;

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Thanks for the explanation. Allow me to answer inline.<= /p>

    Thomas

     

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    I am not expert in synchronization, so = please bear with me.

     

    By clock accuracy information, I mean h= ow accurate a node can maintain (e.g. =B11 ms) synchronization in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device’ environment conditions (e.g. temperature or shocks) and it doesn’t just depend o= n crystals hardware. Am I right?

     

    Agreed. I am used to the term "clock drift" for the phen= omenon, but absolutely, drift depends on manufacturing, voltage, temperatur= e, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronizat= ion needs to happen, given a guard time (i.e. 1ms). Of course, all these pa= rameters depend on each other, so you can imagine buying a better clock sou= rce, or changing the re-synchronization frequency, or changing the guard time.

     

     In the centralized approach, the = System/Network managers, use (L2) device clock accuracy information as well as (L3) nodes’ topology information (similar to node’s= rank in RPL in 6tsch distributed approach) to select the potential clock s= ources in the network. Am I right? 

     

    Hmm. I understand what you are proposing, but my first reaction is= to be a bit afraid that basing time source neighbor selection on clock dri= ft information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my = neighbor, could I not resolve that locally (through all kind of techniques = we can think of), rather than involving the time source neighbor selection = process in that?

     

     In a distributed approach, a netw= ork device might inform their neighbors about its (L2) clock accuracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL’ rank), to choose its timing parent.

     

    This would certainly invert the approach. Now, we let RPL select r= outing parents, and then we have TSCH just use the same. If we go the other= way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the f= irst of which are synchronization loops.

     

     If in 6tsch, we are considering t= he case that all the nodes in the network have equal high clock accuracy, then let’s consider (L3) router’s rank, based on the= default OF (as Raghuram suggest), as the only factor for selecting = timing parent.

     

    I would go that route, but maybe you have some counter example in = mind?

     

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

     

    Pouria, all,

     

    My 2c is the following. We already agreed on the fact that a mote'= s (RPL) routing parent would also be its (TSCH) time source neighbor. So wh= y not pick the time source neighbor based on routing information?

     

    What exactly do you mean by clock accuracy? All nodes in a TSCH ne= twork need to be able to synchronize with one another, and I don't think we= are considering cases where that is not true.

     

    Thomas

     

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:

    Raghuram,

    I agree with you that we need a method to pick a timi= ng parent.

    We might need the L3 information on that, unless we c= an find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

     

    From: Raghuram Sudhaakar (rs= udhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

     

    Xavi, Pouria,

    I think we need to keep node rank at 6top (as a read = only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

     

    We should propose a default OF, that is used to compu= te the ranks for the purpose finding the timing parent.

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

     

    Good point :-)

    agreed!
    X

     

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    I guess we cannot keep “node rank= ” in the 6top. Because a node might have different rank based on different metrics defined in L3. As a response, I don’t think we can= get all of those information form L3 and use them in neighbor table in 6to= p. Am I right?

    I think, as you mentioned we need to wo= rk on them.

     

    Pouria  

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Many thanks for your complete explanati= on. It absolutely makes sense.

     

    Just one minor question. The neighbor t= able will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?

    there are many different ways to implement that, this is an= option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about connect= ivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your description. Besides, there isn't a c= ommon shared cell to send KAs. I see the operation in the following way:

    6top KA timer expires and places a KA packet into the queue (e.g this ha= ppens every 30s). TSCH layer at the begining of a shared tx/rx slot then re= ads from the queue and sends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation us= ing Neighbors information described in Basic configuration.

        -this includes how = OF is calculated using numTx and numTxACK, etc..

     

    []

    -RPL configuration:<= /p>

         - storing mod= e vs non-storing mode (I vote for non-storing mode for a basic configuratio= n)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


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qinwang@berkeley.edu Wed Aug 28 10:20:51 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2407721E80B1 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 10:20:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1SRm4L312sFE for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 10:20:50 -0700 (PDT) Received: from mail-ve0-f180.google.com (mail-ve0-f180.google.com [209.85.128.180]) by ietfa.amsl.com (Postfix) with ESMTP id 2165621E80A5 for <6tsch@ietf.org>; Wed, 28 Aug 2013 10:20:49 -0700 (PDT) Received: by mail-ve0-f180.google.com with SMTP id pb11so4535651veb.11 for <6tsch@ietf.org>; Wed, 28 Aug 2013 10:20:49 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=UZdsNcFsYPfeXA6jqBTZEdzIdpD0ftApEXPiu1fcpMQ=; b=GThZX1bgBnvAmz6qisZ52htYmGZrBTxIBRYZpKwC3IrMgRkkqnJKO9xTPE1iC84m0+ lYqcpomYkDAWDpCQ+964wdbFxmN+xOMB041PjCYlvwJTo+iFlyQbl9Sp084sGVhq12D2 6dvCqgYKmdQGKAXDdHzNGgF9uZ3t2MhcafKlCl9OzXjd2HLlUO6YwUKk/RvDk9tVfPe9 4peKGj0Kr/GCdw8tZZm0jwpZxOgP0UXdBSzML61Ys63DyA14Y/+++VlLvr6vyk9VxIyz 4YRGN5d3OEfNrFEA0rNjwIG4MNsZvCLEk4zgE96Eo4AHkyhrvzUqY151M1+MMPGFLHR0 3HUw== X-Gm-Message-State: ALoCoQl8TGVFrssr9a/Jn3CGuR7jptxNQV42Hv7PHlUy+wREEw7jpLLOtJH6IxeR98JrTFfJEExt MIME-Version: 1.0 X-Received: by 10.52.249.50 with SMTP id yr18mr12040305vdc.25.1377710449322; Wed, 28 Aug 2013 10:20:49 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Wed, 28 Aug 2013 10:20:48 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661E@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661E@EXMBX23.ad.utwente.nl> Date: Thu, 29 Aug 2013 01:20:48 +0800 Message-ID: From: Qin Wang To: "P.Zand@utwente.nl" Content-Type: multipart/related; boundary=089e01495490ef857804e5053533 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 17:20:51 -0000 --089e01495490ef857804e5053533 Content-Type: multipart/alternative; boundary=089e01495490ef857504e5053532 --089e01495490ef857504e5053532 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi Pouria, I proposed adding "Change time source" along with "Choosing the RPL parent" because we agreed before that the RPL parent will be used as the time source. And, this time Xavi proposed to use the node with lowest EB' join priority as time source is just because the RPL parent hasn't been found at the beginning. Make sense? Qin On Thu, Aug 29, 2013 at 12:52 AM, wrote: > Hi Qin,**** > > I changed the diagram based on your comment.**** > > However, I couldn=92t conclude form the discussion on =93time parent sele= ction > based on EB priority=94 thread to find out, if L3 will make the final > decision about the time source or L2.**** > > Best Wishes,**** > > Pouria**** > > **** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Wednesday, August 28, 2013 5:31 PM > *To:* Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Hi Pouria,**** > > ** ** > > It is great to have the diagram as common base to discuss. I would like t= o > add "Changing time source" along with "Choosing the RPL parent", because > the time source selected at the beginning is just a temporary one, and ti= me > source in L2 should be same as the RPL parent in L3 after RPL parent is > selected.**** > > ** ** > > make sense?**** > > ** ** > > Qin**** > > **** > > ** ** > > On Wed, Aug 28, 2013 at 7:55 PM, wrote:**** > > Dear All,**** > > I would like to continue our discussion for choosing the time source > (either in L2 or L3) in the basic RPL. **** > > I prepared a sample of message sequence chart to show the potential > procedure for basic RPL.**** > > I think we can refer to or modify the attached slide to discuss the > details for constructing the basic RPL, as well as choosing the time sour= ce. > **** > > Best Wishes,**** > > Pouria **** > > **** > > **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Wednesday, August 21, 2013 7:45 AM**** > > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria,**** > > Glad to read we agree!**** > > Thomas**** > > **** > > On Tue, Aug 20, 2013 at 12:53 PM, wrote:**** > > Thomas,**** > > **** > > Many thanks for your explanation.**** > > I couldn=92t find the related counter in MAC PIB of IEEE 802.15.4.**** > > **** > > My first idea was using both (a) clock accuracy information and (b) RPL > rank information for choosing the best timing parent between two routers > with equal (or close) RPL rank. That would help us to avoid (1) > synchronization loop problem and (2) potential drifting problem caused by > choosing the parent, between two with equal ranks but not equal clock > accuracy.**** > > **** > > As you mentioned, let=92s not make it complicated and consider the parent > rank as a factor for choosing the timing parent.**** > > **** > > Pouria.**** > > **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Tuesday, August 20, 2013 7:54 AM**** > > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria,**** > > Thanks for the explanation. Allow me to answer inline.**** > > Thomas**** > > **** > > On Mon, Aug 19, 2013 at 10:57 AM, wrote:**** > > Thomas,**** > > **** > > I am not expert in synchronization, so please bear with me.**** > > **** > > By clock accuracy information, I mean how accurate a node can maintain > (e.g. =B11 ms) synchronization in the network for a period of time (e.g. = 20 > s) without the need for clock update. Different devices might have > different clock accuracy values represent by parts per million (ppm) unit= . > The clock accuracy of a device might depend on the device=92 environment > conditions (e.g. temperature or shocks) and it doesn=92t just depend on > crystals hardware. Am I right?**** > > **** > > Agreed. I am used to the term "clock drift" for the phenomenon, but > absolutely, drift depends on manufacturing, voltage, temperature, and > probably other environmental factors. The amount of drift of your clock > source will dictate how often resynchronization needs to happen, given a > guard time (i.e. 1ms). Of course, all these parameters depend on each > other, so you can imagine buying a better clock source, or changing the > re-synchronization frequency, or changing the guard time.**** > > **** > > In the centralized approach, the System/Network managers, use (L2) > device clock accuracy information as well as (L3) nodes=92 topology > information (similar to node=92s rank in RPL in 6tsch distributed approac= h) > to select the potential clock sources in the network. Am I right? **** > > **** > > Hmm. I understand what you are proposing, but my first reaction is to be = a > bit afraid that basing time source neighbor selection on clock drift > information might lead to lots of complexity, for not much gain (I think)= . > If I am drifting a lot wrt to my neighbor, could I not resolve that local= ly > (through all kind of techniques we can think of), rather than involving t= he > time source neighbor selection process in that?**** > > **** > > In a distributed approach, a network device might inform their > neighbors about its (L2) clock accuracy. A new device might use this > information, as well as L3 parameters (e.g. sender RPL=92 rank), to choos= e > its timing parent.**** > > **** > > This would certainly invert the approach. Now, we let RPL select routing > parents, and then we have TSCH just use the same. If we go the other way > around, i.e. select time source neighbors, then routes, many things will > get complicated real quick, the first of which are synchronization loops.= * > *** > > **** > > If in 6tsch, we are considering the case that all the nodes in the > network have equal high clock accuracy, then let=92s consider (L3) router= =92s > rank, based on the *default OF* (as Raghuram suggest), as the only factor > for selecting timing parent.**** > > **** > > I would go that route, but maybe you have some counter example in mind?*= * > ** > > **** > > Pouria**** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Monday, August 19, 2013 4:28 AM > *To:* 6TSCH**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria, all,**** > > **** > > My 2c is the following. We already agreed on the fact that a mote's (RPL) > routing parent would also be its (TSCH) time source neighbor. So why not > pick the time source neighbor based on routing information?**** > > **** > > What exactly do you mean by clock accuracy? All nodes in a TSCH network > need to be able to synchronize with one another, and I don't think we are > considering cases where that is not true.**** > > **** > > Thomas**** > > **** > > On Thu, Aug 15, 2013 at 3:07 PM, wrote:**** > > Raghuram,**** > > I agree with you that we need a method to pick a timing parent.**** > > We might need the L3 information on that, unless we can find a solution i= n > 6top to use L2 information. For example about the clock accuracy > capabilities of the device who has already joined the network. I am not > sure if this information is available in L2 and neighbor table.**** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] > *Sent:* Wednesday, August 14, 2013 12:57 AM > *To:* xvilajosana@eecs.berkeley.edu; Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org; Qin Wang**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Xavi, Pouria,**** > > I think we need to keep node rank at 6top (as a read only parameter > obtained from L3) in order for the TSCH nodes to figure out the timing > parent. In the case where RPL node may have different ranks based on > different OFs we need a method to pick a timing parent.**** > > **** > > We should propose a default OF, that is used to compute the ranks for the > purpose finding the timing parent.**** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: * > *Date: *Tuesday, August 13, 2013 2:27 PM > *To: *Pouria Zand > *Cc: *Thomas Watteyne , "6tsch@ietf.org" < > 6tsch@ietf.org>, Qin Wang > *Subject: *Re: [6tsch] RPL on Basic**** > > **** > > Good point :-)**** > > agreed! > X**** > > **** > > On Tue, Aug 13, 2013 at 2:20 PM, wrote:**** > > Xavi,**** > > **** > > I guess we cannot keep =93node rank=94 in the 6top. Because a node might = have > different rank based on different metrics defined in L3. As a response, I > don=92t think we can get all of those information form L3 and use them in > neighbor table in 6top. Am I right? **** > > I think, as you mentioned we need to work on them. **** > > **** > > Pouria **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 11:13 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria, > > yes the neighbor table is something that 6top takes care of. The fields o= f > the table is something that we need to work on, stats for sure as describ= ed > by the basic configuration draft. As regards to the rank, in our > implementation, we keep it in the table, for each neighbour we keep its > rank. This information can be placed somewhere else if you want but I gue= ss > we need it to keep some sense on what is the rank of our neighbors.**** > > regards,**** > > Xavi**** > > **** > > **** > > On Tue, Aug 13, 2013 at 2:05 PM, wrote:**** > > Xavi,**** > > **** > > Many thanks for your complete explanation. It absolutely makes sense.**** > > **** > > Just one minor question. The neighbor table will be stored in 6top. Am I > right? If yes, do we need to store rank information (included in DIO) in > that table? Or we just store neighbor statistic?**** > > **** > > Pouria **** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 10:17 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > answer inline:**** > > Xavi,**** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > there are many different ways to implement that, this is an option.**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI?**** > > These are the list of known neighbors with acceptable RSSI, so yes if it > wants to keep all of them.**** > > Or (2) the node should probe its connection with the its RPL parent and > its RPL child? In the case (2), how does the 6top can inform the L3 about > the new potential discovered neighbors and their connection status? **** > > When a node is discovered due to receiving and EB (at least in our openws= n > implementation), it is inserted at the neighbor table. At that point no > information about connectivity can be used except RSSI. As soon as a DIO = is > received from that node, its information is updated (including rank). As = we > don't have any information about connectivity (as RFC6552 describes) an > initial value is set (i.e rank + FOO). In openwsn a similar case to (1) i= s > used so eventually some stats of the link can be used to compute the ETX > and let RPL do its work. **** > > So RPL knows about a new node because 6TOP keeps information of neighbors > an eventually this information is used by RPL to update routes. As this > node sends DIOs and receives DIOs from others the information is > permanently being updated enabling a node to be positioned in the multiho= p > topology.**** > > Does it make sense?**** > > Pouria**** > > **** > > On Tue, Aug 13, 2013 at 12:40 PM, wrote:**** > > Xavi,**** > > **** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > **** > > Pouria**** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > **** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:*6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --089e01495490ef857504e5053532 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Hi Pouria,

    I proposed adding "Chan= ge time source" along with "Choosing the RPL parent" because= we agreed before that the RPL parent will be used as the time source. And,= this time Xavi proposed to use the node with lowest EB' join priority = as time source is just because the RPL parent hasn't been found at the = beginning.=A0

    Make sense?

    Qin

    =



    On Thu, Aug 29, 2013 at 12:52 AM, <P.Zand@= utwente.nl> wrote:

    Hi Qin,

    I changed the diagram bas= ed on your comment.

    However, I couldn=92t con= clude form the discussion on =93time parent selection based on EB priority= =94 thread to find out, if L3 will make the final decision about the time source or L2.

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Wednesday, August 28, 2013 5:31 PM
    To: Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    =A0

    It is great to have the diagram as common base to di= scuss. I would like to add "Changing time source" along with &quo= t;Choosing the RPL parent", because the time source selected at the be= ginning is just a temporary one, and time source in L2 should be same as the RPL parent in L3 after RPL parent is selected.

    =A0

    make sense?

    =A0

    Qin

    =A0

    =A0

    On Wed, Aug 28, 2013 at 7:55 PM, <P.Zand@utwente.nl> wrote:=

    Dear All,

    I would like to continue = our discussion for choosing the time source (either in L2 or L3) in the basic RPL.

    I prepared a sample of me= ssage sequence chart to show the potential procedure for basic RPL.<= u>

    I think we can refer to o= r modify the attached slide to discuss the details for constructing the basic RPL, as well as choosing the time source.

    Best Wishes,

    Pouria =A0<= u>

    <= u>

    =A0<= /p>

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 21, 2013 7:45 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    Glad to read we agree!

    Thomas

    =A0

    On Tue, Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,<= /u>

    =A0<= /p>

    Many thanks for your expl= anation.

    I couldn=92t find the rel= ated counter in MAC PIB of IEEE 802.15.4.

    =A0<= /p>

    My first idea was using b= oth (a) clock accuracy information and (b) RPL rank information for choosin= g the best timing parent between two routers with equal (or close) RPL rank.= That would help us to avoid (1) synchronization loop problem and (2) poten= tial drifting problem caused by choosing the parent, between two with equal= ranks but not equal clock accuracy.

    =A0<= /p>

    As you mentioned, let=92s= not make it complicated and consider the parent rank as a factor for choos= ing the timing parent.

    =A0<= /p>

    Pouria.<= /u>

    =A0=A0=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    Thanks for the explanation. Allow me to answer inlin= e.

    Thomas

    =A0

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,<= /u>

    =A0<= /p>

    I am not expert in synchr= onization, so please bear with me.

    =A0<= /p>

    By clock accuracy informa= tion, I mean how accurate a node can maintain (e.g. =B11 ms) synchronizatio= n in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device=92 environment conditions (e.g. temperature or shocks) and it doesn=92t just depend on cr= ystals hardware. Am I right?

    =A0

    Agreed. I am used to the term "clock drift"= ; for the phenomenon, but absolutely, drift depends on manufacturing, volta= ge, temperature, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronizat= ion needs to happen, given a guard time (i.e. 1ms). Of course, all these pa= rameters depend on each other, so you can imagine buying a better clock sou= rce, or changing the re-synchronization frequency, or changing the guard time.

    =A0

    =A0In the centralized app= roach, the System/Network managers, use (L2) device clock accuracy informat= ion as well as (L3) nodes=92 topology information (similar to node=92s rank in= RPL in 6tsch distributed approach) to select the potential clock sources i= n the network. Am I right?=A0

    =A0

    Hmm. I understand what you are proposing, but my fir= st reaction is to be a bit afraid that basing time source neighbor selectio= n on clock drift information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my = neighbor, could I not resolve that locally (through all kind of techniques = we can think of), rather than involving the time source neighbor selection = process in that?

    =A0

    =A0In a distributed appro= ach, a network device might inform their neighbors about its (L2) clock acc= uracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL=92 rank), to choose its timing parent.

    =A0

    This would certainly invert the approach. Now, we le= t RPL select routing parents, and then we have TSCH just use the same. If w= e go the other way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the f= irst of which are synchronization loops.

    =A0

    =A0If in 6tsch, we are co= nsidering the case that all the nodes in the network have equal high clock accuracy, then let=92s consider (L3) router=92s rank, based on the defa= ult OF (as Raghuram suggest), as the only factor for selecting timing p= arent.

    =A0<= /p>

    I would go that route, but maybe you have some count= er example in mind?

    =A0

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria, all,

    =A0

    My 2c is the following. We already agreed on the fac= t that a mote's (RPL) routing parent would also be its (TSCH) time sour= ce neighbor. So why not pick the time source neighbor based on routing information?

    =A0

    What exactly do you mean by clock accuracy? All node= s in a TSCH network need to be able to synchronize with one another, and I = don't think we are considering cases where that is not true.

    =A0

    Thomas

    =A0

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:=

    Raghuram,

    I agree with you that we need a method = to pick a timing parent.

    We might need the L3 information on tha= t, unless we can find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Raghuram= Sudhaakar (rsudhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Xavi, Pouria,

    I think we need to keep node rank at 6t= op (as a read only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

    =A0

    We should propose a default OF, that is= used to compute the ranks for the purpose finding the timing parent.

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Good poi= nt :-)

    agreed!
    X

    =A0

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl&= gt; wrote:

    Xavi,

    =A0<= /p>

    I guess we cannot keep = =93node rank=94 in the 6top. Because a node might have different rank based= on different metrics defined in L3. As a response, I don=92t think we can get= all of those information form L3 and use them in neighbor table in 6top. A= m I right?

    I think, as you mentioned= we need to work on them.

    =A0<= /p>

    Pouria =A0<= u>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

    =A0

    =A0

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:=

    Xavi,

    =A0<= /p>

    Many thanks for your comp= lete explanation. It absolutely makes sense.

    =A0<= /p>

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    answer inline:=

    Xavi,

    Keep Alive timer expires for =93node A=94 aft= er 30s if no frames have been sent (or received) to (or from) neighbor =93n= ode B=94. Am I right?

    there are many different ways to implement that, this is an= option.

    =A0

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about con= nectivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

    =A0

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or from) neighbor =93node B=94. Am I right?

    =A0<= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status? =A0=A0=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the= following way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.=

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From:6tsch-bounces@ietf.org= [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchron= ized with its RPL parent. In the absence of traffic, the node will periodic= ally "keep alive" (per Xavi's e-mail) to the parent. How ofte= n depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:<= u>

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function = calculation using Neighbors information described in Basic configuration.

    =A0=A0=A0 -this includes= how OF is calculated using numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing m= ode vs non-storing mode (I vote for non-storing mode for a basic configurat= ion)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


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v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=lnuXYIuQHL8Eo8jaijvd8sXnC+Y1dCSWxrWnie5FDKU=; b=pES3/BHKZavc951HdhO3gJCgXkUS12L1L4TndWTw03Xo0rO48RlGKO+zoFclaFgRvB gGs4sVoYMK93QkoKCZ2jNjA+oeLxQ0Dh+81S7PyVtjkvJRZaF+4twtcXah3XqnRvxDyh igX5ZlESnnYCihzgWeuOSFZ3OPG8PKXSb9vuerBp6NoW/hnHd4ZYk8mzW9h5CHZRFXU8 Q8c7UGPLYlzgnwAzCKVI8VBCtqJmIvJXWEvVs7MqEGazJaEvpAvKmNO2OxGY47i2jSKB Y15lGLZ4MnWzhQ1jBfNPywOnTa1xQSbLvbHNZYj51vMLyAuX3X8wddtNmGVvGwzgyJQt Ul4A== X-Gm-Message-State: ALoCoQnokWJZ9gWpKNa8RamMwg8dBM+b5BSt4WseChE21ctqoEeJhJoy8kFr2DKStdpP9o3uIq6g MIME-Version: 1.0 X-Received: by 10.68.36.132 with SMTP id q4mr28904157pbj.118.1377712190281; Wed, 28 Aug 2013 10:49:50 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Wed, 28 Aug 2013 10:49:50 -0700 (PDT) In-Reply-To: References: Date: Wed, 28 Aug 2013 10:49:50 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=bcaec5216259b4671304e5059df9 Cc: Maria Rita PALATTELLA , Thomas Watteyne , "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 17:49:55 -0000 --bcaec5216259b4671304e5059df9 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi, while it sounds to me a great idea, I think it is better first to concentrate on the basic things. IMHO, we need first to define the signals to control the flow of data, later if we can define little headers where we can add this control bits together with data packets would be a good enhancement. What do you think? X On Wed, Aug 28, 2013 at 7:51 AM, Qin Wang wrote: > Hi Pascal, > > I think your "a few control bits piggy-backed with the existing traffic" > is a good idea. Over-provision can increase the throughput at peak time, > while the control bits can reduce the energy consumption for idle-listeni= ng > (at least at the beginning of slot) in those unused Tx/Rx cells. > > Xavi and Thomas, I think the method can be used to save energy in our > over-provision case, event that is for improving link quality. What do yo= u > think? > > Thanks > Qin > > > On Wed, Aug 28, 2013 at 8:05 PM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote: > >> Hello Maria Rita:**** >> >> ** ** >> >> There are also schemas that could allow to dynamically adapt the amount >> of cells in a bundle between 2 peer routers with a few control bits >> piggy-backed with the existing traffic.**** >> >> Such schema would avoid the need for out-of-band control traffic and >> avoid the problem of pre allocating slots for that purpose. **** >> >> ** ** >> >> In the simplest case, we would allocate a peak n number of time slots fo= r >> a bundle but signal with a control bit whether the next slot is actually >> free in which case both sender and receiver would sleep at that time. By >> default the devices would send/receive every p > or additional retries require so, the co-next slot would be activated. *= * >> ** >> >> ** ** >> >> For instance with p =3D 1 and n =3D 4 we can quadruple the throughput at= peak >> time.**** >> >> ** ** >> >> What do you think?**** >> >> ** ** >> >> Pascal**** >> >> ** ** >> >> *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On >> Behalf Of *Maria Rita PALATTELLA >> *Sent:* mercredi 28 ao=FBt 2013 11:38 >> *To:* Thomas Watteyne; 6tsch@ietf.org >> >> *Subject:* Re: [6tsch] the 4th control flow**** >> >> ** ** >> >> Thomas, I believe that after defining the message format for each flow, >> we will have to address the issue you have just raised up, i.e., the ce= lls >> to be used for any kind of signaling traffic (i.e., add/delete cells, >> report traffic, etc.).**** >> >> Even though we may start using the slotted aloha schedule approach, in >> the future, we may think about dedicated tracks, to be built according t= o >> the requirements of the schedule used for transferring the actual data >> traffic.**** >> >> What do you think? **** >> >> Maria Rita **** >> >> ** ** >> >> *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org<6tsch-boun= ces@ietf.org>] >> *On Behalf Of *Thomas Watteyne >> *Sent:* Wednesday, August 28, 2013 12:40 AM >> *To:* 6tsch@ietf.org >> *Subject:* Re: [6tsch] the 4th control flow**** >> >> ** ** >> >> Qin,**** >> >> ** ** >> >> You bring up a good point: over what cells with the reports travel? >> Another questions could be: over what cells will the request to install >> cells travel? I believe that, whatever the policy in place in the networ= k, >> there will always need to be some cells installed for infrequent signali= ng >> traffic. If the report rate is very slow, it might qualify as "infrequen= t >> signaling traffic". For sure, the request to change the schedule qualifi= es. >> **** >> >> ** ** >> >> Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloh= a >> schedule indicated in the draft can be used for the signaling traffic >> between the nodes and the ME. Of course, if the report rate is very high= , >> some dedicate track might be installed, but I do not believe this is >> needed, certainly not this early on.**** >> >> ** ** >> >> I agree with Diego that keeping the solution open to different >> alternative is key.**** >> >> ** ** >> >> Thomas**** >> >> ** ** >> >> On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne < >> diego.dujovne@mail.udp.cl> wrote:**** >> >> Qin, Thomas, >> Alternative (1) adds delay to define the slots to send the event >> to the ME (propagate the new schedule), >> while alternative (2) keeps reserved slots waiting for the event to >> happen. >> I think both alternatives should be included, and configured by the ME >> depending >> on the network requirements. >> >> More thoughts? >> >> Diego Dujovne >> >> 2013/8/27 Qin Wang :**** >> >> > Thomas, >> > >> > I agree with almost all. Only some comments on "Report Flow". >> > >> > As you mentioned, there are two kinds of report scenarios, one is >> > periodically report, another one is burst report or called as >> event-driven >> > report. I have no question on how periodically report works, which you >> > described. But I'm not sure what the best way to handle event-driven >> report >> > is. I think we don't want to assume 6top sublayer is very intelligent, >> in >> > another word, the events and the trigger of events should be configure= d >> by >> > ME, just like the interval of periodically report. Make sense? >> > >> > If you agree to it, the remained issue is when and how the bandwidth >> for >> > sending event-driven reports is reserved. Here are two ways I can see. >> > (1) when a event is triggered, node sends a request to ME and ask some >> BW to >> > send the report. I believe that is how the 4th control flow works. >> > (2) when ME configure the events and their triggers, ME also provision= s >> some >> > BW for the node which allows the node to send the report triggered by >> some >> > event. >> > >> > I have no strong opinion on which one is better. But, the bottom line >> is the >> > configuration of the set of events and their triggers should be out of >> 6top >> > scope. Thought? >> > >> > Thanks >> > Qin >> > >> > >> > >> > >> > >> > >> > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne >> > wrote: >> >> >> >> Qin, >> >> >> >> Please correct me if I'm wrong: >> >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typic= al >> >> commands are add/delete cells. >> >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> >> queries are about current cells usage or statistics. >> >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical >> reported >> >> information covers cells usage or statistics. >> >> >> >> Questions: >> >> - Looks like Query and Report flows contain the same information. In >> >> normal operation, the Report flow should be enough, the Query flow on= ly >> >> being used in special cases, for example when the ME has lost state >> (just >> >> booted, bug, etc). Agreed? >> >> - The ME should be able to configure the report flow. Configuration >> could >> >> be "send report every X seconds" or "send report when variable X >> larger than >> >> Y". I imagine this could be done over the action flow? Agreed? >> >> - A node will want to report an urgent event to the ME. One such >> events is >> >> "the topology appears to have changed". There any many cases where th= is >> >> information needs to be sent immediately, i.e. no time to wait for th= e >> next >> >> report cycle. We can consider this to be an asynchronous report, or >> part of >> >> a new "Event" flow. >> >> - Same for the mote asking the ME for a schedule update. >> >> >> >> Thoughts? >> >> >> >> Thomas >> >> >> >> >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang >> wrote: >> >>> >> >>> Xavi, >> >>> >> >>> Approach-(2) is more flexible and likely covers more situations. But= , >> it >> >>> may bring some complexity to 6top, because 6top has to make decision >> on the >> >>> bandwidth request (add/delete), which needs some metrics, some >> intelligence. >> >>> >> >>> What do you think? >> >>> >> >>> Qin >> >>> >> >>> >> >>> >> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >> >>> wrote: >> >>>> >> >>>> Hi Qin, I like your (2). >> >>>> >> >>>> Note also that there are situations that might have some difference= s. >> >>>> >> >>>> 1-the track already exists. >> >>>> 2-the track between the two entities does not exists >> >>>> >> >>>> in either case I think that the node that requires certain BW to >> another >> >>>> node should talk to 6top, which processes that request and sends a >> request >> >>>> to the ME, the ME installs that new track. >> >>>> >> >>>> does it make sense. Do you see any drawback on that approach? >> >>>> >> >>>> X >> >>>> >> >>>> >> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang >> wrote: >> >>>>> >> >>>>> Hi all, >> >>>>> >> >>>>> During today's call, we presented three control flows between >> >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and >> Report >> >>>>> Flow, and started to talk about the 4th control flow. The thread >> will >> >>>>> continue the discussion about 4th flow. >> >>>>> >> >>>>> Here is the scenario: when a node finds that more cells are needed= , >> >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be >> able to >> >>>>> ask ME to install more bandwidth. >> >>>>> >> >>>>> I can see two approaches: >> >>>>> (1) Managed by ME, without 4th Control Flow. Assume >> BandwidthUsageRate >> >>>>> is a attribute in 6top. Then, ME can get the information via Query >> Flow or >> >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >> >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >> >>>>> Request to ME, and then ME install more bandwidth. This is the 4th >> control >> >>>>> flow. >> >>>>> >> >>>>> What do you think? Which one makes more sense? >> >>>>> >> >>>>> Qin >> >>>>> >> >>>>> >> >>>>> >> >>>>> _______________________________________________ >> >>>>> 6tsch mailing list >> >>>>> 6tsch@ietf.org >> >>>>> https://www.ietf.org/mailman/listinfo/6tsch >> >>>>> >> >>>> >> >>> >> >>> >> >>> _______________________________________________ >> >>> 6tsch mailing list >> >>> 6tsch@ietf.org >> >>> https://www.ietf.org/mailman/listinfo/6tsch >> >>> >> >> >> >> >> >> >> >> -- >> >> Thomas Watteyne, Ph. D >> >> Sr. Networking Design Engineer >> >> Dust Networks / Linear Technology >> >> 30695 Huntwood Ave >> >> Hayward, CA 94544-7021 >> >> +1 (510) 400-2978 >> >> twatteyne@linear.com >> >> >> >> This e-mail transmission, and any documents, files or previous e-mail >> >> messages attached to it may contain confidential information that is >> legally >> >> privileged. If you are not the intended recipient, or a person >> responsible >> >> for delivering it to the intended recipient, you are hereby notified >> that >> >> any disclosure, copying, distribution or use of any of the informatio= n >> >> contained in or attached to this transmission is STRICTLY PROHIBITED. >> If you >> >> have received this transmission in error, please immediately notify m= e >> by >> >> reply e-mail, or by telephone at (510) 400-2978, and destroy the >> original >> >> transmission and its attachments without reading or saving in any >> manner. >> >> Thank you. >> > >> > >> > >> > _______________________________________________ >> > 6tsch mailing list >> > 6tsch@ietf.org >> > https://www.ietf.org/mailman/listinfo/6tsch >> > >> >> >> >> --**** >> >> DIEGO DUJOVNE >> Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicacione= s >> Facultad de Ingenier=EDa UDP >> www.ingenieria.udp.cl >> (56 2) 676 8125**** >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch**** >> >> ** ** >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --bcaec5216259b4671304e5059df9 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi,

    while it sounds to me a great idea, I thin= k it is better first to concentrate on the basic things. IMHO, we need firs= t to define the signals to control the flow of data, later if we can define= little headers where we can add this control bits together with data packe= ts would be a good enhancement.

    What do you think?
    X

    <= br>
    On Wed, Aug 28, 2013 at 7:51 AM, Qin Wang <qinwang@berkeley.edu> wrote:
    Hi Pascal,

    I think your "a few control bits piggy-backed with the exis= ting traffic" is a good idea. Over-provision can increase the t= hroughput at peak time, while the control bits can reduce the energy consum= ption for idle-listening (at least at the beginning of slot) in those unuse= d Tx/Rx cells.

    Xavi and Thomas, I think the method can be used to save= energy in our over-provision case, event that is for improving link qualit= y. What do you think?

    Thanks
    Qin=


    On Wed, Aug 28, 2013 at 8:05= PM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:<= br>

    Hello Maria Rita:=

    =A0<= /p>

    There are also schemas th= at could allow to dynamically adapt the amount of cells in a bundle between= 2 peer routers with a few control bits piggy-backed with the existing traffic.

    Such schema would avoid t= he need for out-of-band control traffic and avoid the problem of pre alloca= ting slots for that purpose.

    =A0<= /p>

    In the simplest case, we = would allocate a peak n number of time slots for a bundle but signal with a= control bit whether the next slot is actually free in which case both sender and receiver would sleep at that time. By default the dev= ices would send/receive every p <n but if a burst of traffic or addition= al retries require so, the co-next slot would be activated.

    =A0<= /p>

    For instance with p =3D 1= and n =3D 4 we can quadruple the throughput at peak time.

    =A0<= /p>

    What do you think?=

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: 6tsch-bounces@ietf.org= [mailto:6t= sch-bounces@ietf.org] On Behalf Of Maria Rita PALATTELLA
    Sent: mercredi 28 ao=FBt 2013 11:38
    To: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] the 4th control flow
    <= p>

    =A0

    Thomas, I believe that af= ter defining the message format for each flow, =A0we will have to address t= he issue you have just raised up, i.e., the cells to be used for any kind of signaling traffic (i.e., add/delete cells, report traffic,= etc.).

    Even though we may start = using the slotted aloha schedule approach, in the future, we may think abou= t dedicated tracks, to be built according to the requirements of the schedule used for transferring the actual data traffic.

    What do you think?

    Maria Rita

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [ma= ilto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 28, 2013 12:40 AM
    To: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] the 4th control flow

    =A0

    Qin,

    =A0

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in = the network, there will always need to be some cells installed for infrequent signaling traffic. If the report= rate is very slow, it might qualify as "infrequent signaling traffic&= quot;. For sure, the request to change the schedule qualifies.

    =A0

    Isn't the answer=A0draft-vilajosana-6tsch-basic?= That is, the slotted Aloha schedule indicated in the draft can be used for= the signaling traffic between the nodes and the ME. Of course, if the repo= rt rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not thi= s early on.

    =A0

    I agree with Diego that keeping the solution open to= different alternative is key.

    =A0

    Thomas

    =A0

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
    =A0 =A0 =A0 Alternative (1) adds delay to define the slots to send the even= t
    to the ME (propagate the new schedule),
    while alternative (2) =A0keeps reserved slots waiting for the event to happ= en.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driv= en report
    > is. I think we don't want to assume 6top sublayer is very intellig= ent, in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is =A0when and how the bandwidt= h for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control fl= ows between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (= 510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125=

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

    =A0


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch



    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    --bcaec5216259b4671304e5059df9-- From P.Zand@utwente.nl Wed Aug 28 11:14:28 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1FF0E21F9B94 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 11:14:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rVasNWT7fcDz for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 11:14:27 -0700 (PDT) Received: from EXEDGE01.ad.utwente.nl (exedge01.ad.utwente.nl [130.89.5.48]) by ietfa.amsl.com (Postfix) with ESMTP id B25CB21F9B03 for <6tsch@ietf.org>; Wed, 28 Aug 2013 11:14:23 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE01.ad.utwente.nl (130.89.5.48) with Microsoft SMTP Server (TLS) id 14.2.328.9; Wed, 28 Aug 2013 20:14:26 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Wed, 28 Aug 2013 20:14:23 +0200 From: To: Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWD//+R/gIAAIcgA///iD4CAABkTAIADNlmggATgRgCAASNqIIAAqJmAgAEGRFCAAImCAIALgp+AgAAhcYCAADXHQP//6M0AAAYJnsA= Date: Wed, 28 Aug 2013 18:14:21 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661E@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/related; boundary="_005_76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8EXMBX23adutwent_"; type="multipart/alternative" MIME-Version: 1.0 Cc: watteyne@eecs.berkeley.edu, 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 18:14:28 -0000 --_005_76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8EXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8EXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8EXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Qin, It absolutely makes sense. Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Wednesday, August 28, 2013 7:21 PM To: Zand, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I proposed adding "Change time source" along with "Choosing the RPL parent"= because we agreed before that the RPL parent will be used as the time sour= ce. And, this time Xavi proposed to use the node with lowest EB' join prior= ity as time source is just because the RPL parent hasn't been found at the = beginning. Make sense? Qin On Thu, Aug 29, 2013 at 12:52 AM, > wrote: Hi Qin, I changed the diagram based on your comment. However, I couldn't conclude form the discussion on "time parent selection = based on EB priority" thread to find out, if L3 will make the final decisio= n about the time source or L2. Best Wishes, Pouria [cid:image001.jpg@01CEA42B.2E527D30] From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Wednesday, August 28, 2013 5:31 PM To: Zand, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, It is great to have the diagram as common base to discuss. I would like to = add "Changing time source" along with "Choosing the RPL parent", because th= e time source selected at the beginning is just a temporary one, and time s= ource in L2 should be same as the RPL parent in L3 after RPL parent is sele= cted. make sense? Qin On Wed, Aug 28, 2013 at 7:55 PM, > wrote: Dear All, I would like to continue our discussion for choosing the time source (eithe= r in L2 or L3) in the basic RPL. I prepared a sample of message sequence chart to show the potential procedu= re for basic RPL. I think we can refer to or modify the attached slide to discuss the details= for constructing the basic RPL, as well as choosing the time source. Best Wishes, Pouria [cid:image002.jpg@01CEA42B.2E527D30] From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Wednesday, August 21, 2013 7:45 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Glad to read we agree! Thomas On Tue, Aug 20, 2013 at 12:53 PM, > wrote: Thomas, Many thanks for your explanation. I couldn't find the related counter in MAC PIB of IEEE 802.15.4. My first idea was using both (a) clock accuracy information and (b) RPL ran= k information for choosing the best timing parent between two routers with = equal (or close) RPL rank. That would help us to avoid (1) synchronization = loop problem and (2) potential drifting problem caused by choosing the pare= nt, between two with equal ranks but not equal clock accuracy. As you mentioned, let's not make it complicated and consider the parent ran= k as a factor for choosing the timing parent. Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Tuesday, August 20, 2013 7:54 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Thanks for the explanation. Allow me to answer inline. Thomas On Mon, Aug 19, 2013 at 10:57 AM, > wrote: Thomas, I am not expert in synchronization, so please bear with me. By clock accuracy information, I mean how accurate a node can maintain (e.g= . =B11 ms) synchronization in the network for a period of time (e.g. 20 s) = without the need for clock update. Different devices might have different c= lock accuracy values represent by parts per million (ppm) unit. The clock a= ccuracy of a device might depend on the device' environment conditions (e.g= . temperature or shocks) and it doesn't just depend on crystals hardware. A= m I right? Agreed. I am used to the term "clock drift" for the phenomenon, but absolut= ely, drift depends on manufacturing, voltage, temperature, and probably oth= er environmental factors. The amount of drift of your clock source will dic= tate how often resynchronization needs to happen, given a guard time (i.e. = 1ms). Of course, all these parameters depend on each other, so you can imag= ine buying a better clock source, or changing the re-synchronization freque= ncy, or changing the guard time. In the centralized approach, the System/Network managers, use (L2) device = clock accuracy information as well as (L3) nodes' topology information (sim= ilar to node's rank in RPL in 6tsch distributed approach) to select the pot= ential clock sources in the network. Am I right? Hmm. I understand what you are proposing, but my first reaction is to be a = bit afraid that basing time source neighbor selection on clock drift inform= ation might lead to lots of complexity, for not much gain (I think). If I a= m drifting a lot wrt to my neighbor, could I not resolve that locally (thro= ugh all kind of techniques we can think of), rather than involving the time= source neighbor selection process in that? In a distributed approach, a network device might inform their neighbors a= bout its (L2) clock accuracy. A new device might use this information, as w= ell as L3 parameters (e.g. sender RPL' rank), to choose its timing parent. This would certainly invert the approach. Now, we let RPL select routing pa= rents, and then we have TSCH just use the same. If we go the other way arou= nd, i.e. select time source neighbors, then routes, many things will get co= mplicated real quick, the first of which are synchronization loops. If in 6tsch, we are considering the case that all the nodes in the network= have equal high clock accuracy, then let's consider (L3) router's rank, ba= sed on the default OF (as Raghuram suggest), as the only factor for selecti= ng timing parent. I would go that route, but maybe you have some counter example in mind? Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Monday, August 19, 2013 4:28 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, all, My 2c is the following. We already agreed on the fact that a mote's (RPL) r= outing parent would also be its (TSCH) time source neighbor. So why not pic= k the time source neighbor based on routing information? What exactly do you mean by clock accuracy? All nodes in a TSCH network nee= d to be able to synchronize with one another, and I don't think we are cons= idering cases where that is not true. Thomas On Thu, Aug 15, 2013 at 3:07 PM, > wrote: Raghuram, I agree with you that we need a method to pick a timing parent. We might need the L3 information on that, unless we can find a solution in = 6top to use L2 information. For example about the clock accuracy capabiliti= es of the device who has already joined the network. I am not sure if this = information is available in L2 and neighbor table. Best Wishes, Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Wednesday, August 14, 2013 12:57 AM To: xvilajosana@eecs.berkeley.edu; Za= nd, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang Subject: Re: [6tsch] RPL on Basic Xavi, Pouria, I think we need to keep node rank at 6top (as a read only parameter obtaine= d from L3) in order for the TSCH nodes to figure out the timing parent. In = the case where RPL node may have different ranks based on different OFs we = need a method to pick a timing parent. We should propose a default OF, that is used to compute the ranks for the p= urpose finding the timing parent. -raghuram From: Xavier Vilajosana Guillen > Reply-To: > Date: Tuesday, August 13, 2013 2:27 PM To: Pouria Zand > Cc: Thomas Watteyne >, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang = > Subject: Re: [6tsch] RPL on Basic Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, > wrote: Xavi, I guess we cannot keep "node rank" in the 6top. Because a node might have d= ifferent rank based on different metrics defined in L3. As a response, I do= n't think we can get all of those information form L3 and use them in neigh= bor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8EXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hi Qin,=

    It absolutely makes sense= .

    Best Wishes,

    Pouria<= /p>

     <= /p>

    From: Qin Wang= [mailto:qinwang@berkeley.edu]
    Sent: Wednesday, August 28, 2013 7:21 PM
    To: Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

     

    I proposed adding "Change time source" alo= ng with "Choosing the RPL parent" because we agreed before that t= he RPL parent will be used as the time source. And, this time Xavi proposed= to use the node with lowest EB' join priority as time source is just because the RPL parent hasn't been found at the beginning.&= nbsp;

     

    Make sense?

     

    Qin

     

     

     

     

    On Thu, Aug 29, 2013 at 12:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    I changed the diagram based on your com= ment.

    However, I couldn’t conclude form= the discussion on “time parent selection based on EB priority” thread to find out, if L3 will make the final decision about the time sour= ce or L2.

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Wednesday, August 28, 2013 5:31 PM
    To: Zand, P. (EWI)
    Cc: Thomas Watteyne;     6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

     

    It is great to have the diagram as common base to discuss. I would= like to add "Changing time source" along with "Choosing the= RPL parent", because the time source selected at the beginning is just a temporary one, and time source in L2 should be same as= the RPL parent in L3 after RPL parent is selected.

     

    make sense?

     

    Qin

     

     

    On Wed, Aug 28, 2013 at 7:55 PM, <P.Zand@utwente.nl> wrote:

    Dear All,

    I would like to continue our discussion= for choosing the time source (either in L2 or L3) in the basic RPL.

    I prepared a sample of message sequence= chart to show the potential procedure for basic RPL.

    I think we can refer to or modify the a= ttached slide to discuss the details for constructing the basic RPL, as well as choosing the time source.

    Best Wishes,

    Pouria  

     

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 21, 2013 7:45 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Glad to read we agree!

    Thomas

     

    On Tue, Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    Many thanks for your explanation.

    I couldn’t find the related count= er in MAC PIB of IEEE 802.15.4.

     

    My first idea was using both (a) clock = accuracy information and (b) RPL rank information for choosing the best timing parent between two routers with equal (or close) RPL rank.= That would help us to avoid (1) synchronization loop problem and (2) poten= tial drifting problem caused by choosing the parent, between two with equal= ranks but not equal clock accuracy.

     

    As you mentioned, let’s not make = it complicated and consider the parent rank as a factor for choosing the timing parent.

     

    Pouria.

          &nb= sp;

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Thanks for the explanation. Allow me to answer inline.<= /p>

    Thomas

     

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    I am not expert in synchronization, so = please bear with me.

     

    By clock accuracy information, I mean h= ow accurate a node can maintain (e.g. =B11 ms) synchronization in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device’ environment conditions (e.g. temperature or shocks) and it doesn’t just depend o= n crystals hardware. Am I right?

     

    Agreed. I am used to the term "clock drift" for the phen= omenon, but absolutely, drift depends on manufacturing, voltage, temperatur= e, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronizat= ion needs to happen, given a guard time (i.e. 1ms). Of course, all these pa= rameters depend on each other, so you can imagine buying a better clock sou= rce, or changing the re-synchronization frequency, or changing the guard time.

     

     In the centralized approach, the = System/Network managers, use (L2) device clock accuracy information as well as (L3) nodes’ topology information (similar to node’s= rank in RPL in 6tsch distributed approach) to select the potential clock s= ources in the network. Am I right? 

     

    Hmm. I understand what you are proposing, but my first reaction is= to be a bit afraid that basing time source neighbor selection on clock dri= ft information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my = neighbor, could I not resolve that locally (through all kind of techniques = we can think of), rather than involving the time source neighbor selection = process in that?

     

     In a distributed approach, a netw= ork device might inform their neighbors about its (L2) clock accuracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL’ rank), to choose its timing parent.

     

    This would certainly invert the approach. Now, we let RPL select r= outing parents, and then we have TSCH just use the same. If we go the other= way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the f= irst of which are synchronization loops.

     

     If in 6tsch, we are considering t= he case that all the nodes in the network have equal high clock accuracy, then let’s consider (L3) router’s rank, based on the= default OF (as Raghuram suggest), as the only factor for selecting = timing parent.

     

    I would go that route, but maybe you have some counter example in = mind?

     

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

     

    Pouria, all,

     

    My 2c is the following. We already agreed on the fact that a mote'= s (RPL) routing parent would also be its (TSCH) time source neighbor. So wh= y not pick the time source neighbor based on routing information?

     

    What exactly do you mean by clock accuracy? All nodes in a TSCH ne= twork need to be able to synchronize with one another, and I don't think we= are considering cases where that is not true.

     

    Thomas

     

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:

    Raghuram,

    I agree with you that we need a method to pick a timi= ng parent.

    We might need the L3 information on that, unless we c= an find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

     

    From: Raghuram Sudhaakar (rs= udhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

     

    Xavi, Pouria,

    I think we need to keep node rank at 6top (as a read = only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

     

    We should propose a default OF, that is used to compu= te the ranks for the purpose finding the timing parent.

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

     

    Good point :-)

    agreed!
    X

     

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    I guess we cannot keep “node rank= ” in the 6top. Because a node might have different rank based on different metrics defined in L3. As a response, I don’t think we can= get all of those information form L3 and use them in neighbor table in 6to= p. Am I right?

    I think, as you mentioned we need to wo= rk on them.

     

    Pouria  

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Many thanks for your complete explanati= on. It absolutely makes sense.

     

    Just one minor question. The neighbor t= able will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?

    there are many different ways to implement that, this is an= option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about connect= ivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your description. Besides, there isn't a c= ommon shared cell to send KAs. I see the operation in the following way:

    6top KA timer expires and places a KA packet into the queue (e.g this ha= ppens every 30s). TSCH layer at the begining of a shared tx/rx slot then re= ads from the queue and sends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation us= ing Neighbors information described in Basic configuration.

        -this includes how = OF is calculated using numTx and numTxACK, etc..

     

    []

    -RPL configuration:<= /p>

         - storing mod= e vs non-storing mode (I vote for non-storing mode for a basic configuratio= n)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


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oAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiig AooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKAC iiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKK KKAP/9k= --_005_76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8EXMBX23adutwent_-- From twatteyne@gmail.com Wed Aug 28 11:15:33 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6F20E21E8050 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 11:15:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.867 X-Spam-Level: X-Spam-Status: No, score=-1.867 tagged_above=-999 required=5 tests=[AWL=0.110, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id awlnlx7pjblV 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10.68.254.42 with SMTP id af10mr16740732pbd.154.1377713730189; Wed, 28 Aug 2013 11:15:30 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Wed, 28 Aug 2013 11:15:09 -0700 (PDT) In-Reply-To: References: From: Thomas Watteyne Date: Wed, 28 Aug 2013 11:15:09 -0700 X-Google-Sender-Auth: KhSfPzviVcdzhNCW-4qXx_m7HUE Message-ID: To: Qin Wang Content-Type: multipart/alternative; boundary=047d7b2e0d837d7f4d04e505f9e3 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 18:15:33 -0000 --047d7b2e0d837d7f4d04e505f9e3 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable All, If possible, let's keep things simple and stick closely to the charter, certainly for now. I would like to propose the following assumptions: - let's assume signaling and data packets are independent. IMO, signaling packets are either short and infrequent (events, commands), or periodic and large (statistics). Once we have run a number= of networks, and can quantify the trade-offs, we can consider piggybacking. - let's consider the steps highlighted in the charter, for now: - draft-vilajosana-6tsch-basic gives us a network with minimal connectivity between all nodes in the network. Most of the schedule i= s empty, available ot some dynamic scheduler. - the scheduler uses the minimal connectivity to communicate, either between neighbors (distributed), or between nodes and the PCE (centralized) If we agree with this, I propose we go back to discussing the types of flows, per the name of this thread. I'd like to call on a rough consensus for the following 4 flows: - ME->node - action - query - node->ME - report - event Thomas On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang wrote: > Thomas, > > I agree to keep different alternatives, at lease as options. > > Regarding to what kinds of cells should be used for conveying the report, > shared cells or dedicated cells, I would like to leave them to > configuration. What do you think? > > Thanks > Qin > > > > On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote: > >> Qin, >> >> You bring up a good point: over what cells with the reports travel? >> Another questions could be: over what cells will the request to install >> cells travel? I believe that, whatever the policy in place in the networ= k, >> there will always need to be some cells installed for infrequent signali= ng >> traffic. If the report rate is very slow, it might qualify as "infrequen= t >> signaling traffic". For sure, the request to change the schedule qualifi= es. >> >> Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloh= a >> schedule indicated in the draft can be used for the signaling traffic >> between the nodes and the ME. Of course, if the report rate is very high= , >> some dedicate track might be installed, but I do not believe this is >> needed, certainly not this early on. >> >> I agree with Diego that keeping the solution open to different >> alternative is key. >> >> Thomas >> >> >> On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne < >> diego.dujovne@mail.udp.cl> wrote: >> >>> Qin, Thomas, >>> Alternative (1) adds delay to define the slots to send the event >>> to the ME (propagate the new schedule), >>> while alternative (2) keeps reserved slots waiting for the event to >>> happen. >>> I think both alternatives should be included, and configured by the ME >>> depending >>> on the network requirements. >>> >>> More thoughts? >>> >>> Diego Dujovne >>> >>> 2013/8/27 Qin Wang : >>> > Thomas, >>> > >>> > I agree with almost all. Only some comments on "Report Flow". >>> > >>> > As you mentioned, there are two kinds of report scenarios, one is >>> > periodically report, another one is burst report or called as >>> event-driven >>> > report. I have no question on how periodically report works, which yo= u >>> > described. But I'm not sure what the best way to handle event-driven >>> report >>> > is. I think we don't want to assume 6top sublayer is very intelligent= , >>> in >>> > another word, the events and the trigger of events should be >>> configured by >>> > ME, just like the interval of periodically report. Make sense? >>> > >>> > If you agree to it, the remained issue is when and how the bandwidth >>> for >>> > sending event-driven reports is reserved. Here are two ways I can see= . >>> > (1) when a event is triggered, node sends a request to ME and ask som= e >>> BW to >>> > send the report. I believe that is how the 4th control flow works. >>> > (2) when ME configure the events and their triggers, ME also >>> provisions some >>> > BW for the node which allows the node to send the report triggered by >>> some >>> > event. >>> > >>> > I have no strong opinion on which one is better. But, the bottom line >>> is the >>> > configuration of the set of events and their triggers should be out o= f >>> 6top >>> > scope. Thought? >>> > >>> > Thanks >>> > Qin >>> > >>> > >>> > >>> > >>> > >>> > >>> > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne >> > >>> > wrote: >>> >> >>> >> Qin, >>> >> >>> >> Please correct me if I'm wrong: >>> >> - Action Flow (ME->6top). ME asks 6top to execute some command. >>> Typical >>> >> commands are add/delete cells. >>> >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >>> >> queries are about current cells usage or statistics. >>> >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical >>> reported >>> >> information covers cells usage or statistics. >>> >> >>> >> Questions: >>> >> - Looks like Query and Report flows contain the same information. In >>> >> normal operation, the Report flow should be enough, the Query flow >>> only >>> >> being used in special cases, for example when the ME has lost state >>> (just >>> >> booted, bug, etc). Agreed? >>> >> - The ME should be able to configure the report flow. Configuration >>> could >>> >> be "send report every X seconds" or "send report when variable X >>> larger than >>> >> Y". I imagine this could be done over the action flow? Agreed? >>> >> - A node will want to report an urgent event to the ME. One such >>> events is >>> >> "the topology appears to have changed". There any many cases where >>> this >>> >> information needs to be sent immediately, i.e. no time to wait for >>> the next >>> >> report cycle. We can consider this to be an asynchronous report, or >>> part of >>> >> a new "Event" flow. >>> >> - Same for the mote asking the ME for a schedule update. >>> >> >>> >> Thoughts? >>> >> >>> >> Thomas >>> >> >>> >> >>> >> >>> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang >>> wrote: >>> >>> >>> >>> Xavi, >>> >>> >>> >>> Approach-(2) is more flexible and likely covers more situations. >>> But, it >>> >>> may bring some complexity to 6top, because 6top has to make decisio= n >>> on the >>> >>> bandwidth request (add/delete), which needs some metrics, some >>> intelligence. >>> >>> >>> >>> What do you think? >>> >>> >>> >>> Qin >>> >>> >>> >>> >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> >>> wrote: >>> >>>> >>> >>>> Hi Qin, I like your (2). >>> >>>> >>> >>>> Note also that there are situations that might have some >>> differences. >>> >>>> >>> >>>> 1-the track already exists. >>> >>>> 2-the track between the two entities does not exists >>> >>>> >>> >>>> in either case I think that the node that requires certain BW to >>> another >>> >>>> node should talk to 6top, which processes that request and sends a >>> request >>> >>>> to the ME, the ME installs that new track. >>> >>>> >>> >>>> does it make sense. Do you see any drawback on that approach? >>> >>>> >>> >>>> X >>> >>>> >>> >>>> >>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang >>> wrote: >>> >>>>> >>> >>>>> Hi all, >>> >>>>> >>> >>>>> During today's call, we presented three control flows between >>> >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, an= d >>> Report >>> >>>>> Flow, and started to talk about the 4th control flow. The thread >>> will >>> >>>>> continue the discussion about 4th flow. >>> >>>>> >>> >>>>> Here is the scenario: when a node finds that more cells are neede= d, >>> >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should b= e >>> able to >>> >>>>> ask ME to install more bandwidth. >>> >>>>> >>> >>>>> I can see two approaches: >>> >>>>> (1) Managed by ME, without 4th Control Flow. Assume >>> BandwidthUsageRate >>> >>>>> is a attribute in 6top. Then, ME can get the information via Quer= y >>> Flow or >>> >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow= . >>> >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>> >>>>> Request to ME, and then ME install more bandwidth. This is the 4t= h >>> control >>> >>>>> flow. >>> >>>>> >>> >>>>> What do you think? Which one makes more sense? >>> >>>>> >>> >>>>> Qin >>> >>>>> >>> >>>>> >>> >>>>> >>> >>>>> _______________________________________________ >>> >>>>> 6tsch mailing list >>> >>>>> 6tsch@ietf.org >>> >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>>>> >>> >>>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> >>> 6tsch mailing list >>> >>> 6tsch@ietf.org >>> >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >>> >> >>> >> >>> >> >>> >> -- >>> >> Thomas Watteyne, Ph. D >>> >> Sr. Networking Design Engineer >>> >> Dust Networks / Linear Technology >>> >> 30695 Huntwood Ave >>> >> Hayward, CA 94544-7021 >>> >> +1 (510) 400-2978 >>> >> twatteyne@linear.com >>> >> >>> >> This e-mail transmission, and any documents, files or previous e-mai= l >>> >> messages attached to it may contain confidential information that is >>> legally >>> >> privileged. If you are not the intended recipient, or a person >>> responsible >>> >> for delivering it to the intended recipient, you are hereby notified >>> that >>> >> any disclosure, copying, distribution or use of any of the informati= on >>> >> contained in or attached to this transmission is STRICTLY PROHIBITED= . >>> If you >>> >> have received this transmission in error, please immediately notify >>> me by >>> >> reply e-mail, or by telephone at (510) 400-2978, and destroy the >>> original >>> >> transmission and its attachments without reading or saving in any >>> manner. >>> >> Thank you. >>> > >>> > >>> > >>> > _______________________________________________ >>> > 6tsch mailing list >>> > 6tsch@ietf.org >>> > https://www.ietf.org/mailman/listinfo/6tsch >>> > >>> >>> >>> >>> -- >>> DIEGO DUJOVNE >>> Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicacion= es >>> Facultad de Ingenier=EDa UDP >>> www.ingenieria.udp.cl >>> (56 2) 676 8125 >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> _______________________________________________ >> 6tsch mailing list >> 6tsch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tsch >> >> > --047d7b2e0d837d7f4d04e505f9e3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    If possible, let's keep things= simple and stick closely to the charter, certainly for now.

    =
    I would like to propose the following assumptions:
    • let's assume signaling and data packets are independent.
      IMO= , signaling packets are either short and infrequent (events, commands), or = periodic and large (statistics). Once we have run a number of networks, and= can quantify the trade-offs, we can consider piggybacking.
    • let's consider the steps highlighted in the charter, for now:
      • <= ul>
    • draft-vilajosana-6tsch-basic gives us a network with minimal connect= ivity between all nodes in the network. Most of the schedule is empty, avai= lable ot some dynamic scheduler.
    • the scheduler uses the minimal connectivity to communicate, either betw= een neighbors (distributed), or between nodes and the PCE (centralized)
    If we agree with this, I propose we go back to discussing t= he types of flows, per the name of this thread. I'd like to call on a r= ough consensus for the following 4 flows:
    • ME->node
      • action
      • query
      • node->ME
        • report
        • event
      Thom= as



    On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    Thomas,

    I agree to keep different alter= natives, at lease as options.

    Regarding to what ki= nds of cells should be used for conveying the report, shared cells or dedic= ated cells, I would like to leave them to configuration. What do you think?=

    Thanks
    Qin

    =


    On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:
    Qin,

    You= bring up a good point: over what cells with the reports travel? Another qu= estions could be: over what cells will the request to install cells travel?= I believe that, whatever the policy in place in the network, there will al= ways need to be some cells installed for infrequent signaling traffic. If t= he report rate is very slow, it might qualify as "infrequent signaling= traffic". For sure, the request to change the schedule qualifies.

    Isn't the answer=A0draft-vilajosana-6tsch-basic? Th= at is, the slotted Aloha schedule indicated in the draft can be used for th= e signaling traffic between the nodes and the ME. Of course, if the report = rate is very high, some dedicate track might be installed, but I do not bel= ieve this is needed, certainly not this early on.

    I agree with Diego that keeping the solution open to di= fferent alternative is key.

    Thomas


    On Tue, = Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne <diego.dujovne@mail.= udp.cl> wrote:
    Qin, Thomas,
    =A0 =A0 =A0 Alternative (1) adds delay to define the slots to send the even= t
    to the ME (propagate the new schedule),
    while alternative (2) =A0keeps reserved slots waiting for the event to happ= en.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:
    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driv= en report
    > is. I think we don't want to assume 6top sublayer is very intellig= ent, in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is =A0when and how the bandwidt= h for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control fl= ows between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destro= y the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



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    --047d7b2e0d837d7f4d04e505f9e3-- From twatteyne@gmail.com Wed Aug 28 11:25:48 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5A8C021E8054 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 11:25:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EgrQ6ohQGbYI for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 11:25:48 -0700 (PDT) Received: from mail-pa0-x234.google.com (mail-pa0-x234.google.com [IPv6:2607:f8b0:400e:c03::234]) by ietfa.amsl.com (Postfix) with ESMTP id D69C021F9FF3 for <6tsch@ietf.org>; Wed, 28 Aug 2013 11:25:47 -0700 (PDT) Received: by mail-pa0-f52.google.com with SMTP id kq13so6558641pab.11 for <6tsch@ietf.org>; Wed, 28 Aug 2013 11:25:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:content-type; bh=ozLDviEwDCHASpXw/I2YXcYgc3Vb/amBaMGoCPXf5PA=; b=CnhIr6AI1YZviV5L16ul3u4bEB0Jwu8JU5T4vvsg0hfZgbBJjigo8fz+E1GABu2b0G q1J99EIj4hG1ycsIq3qFTWZnQx4kDFXl453QSowyFJ6Imd/5AMp3Soa8k3SUsQjHr4TE H22dgyNQyAXcZORMcnMsO/7SD3WdGUtRC+GX9HfOoHk0PY0LgwG0fenm6LbRwGH6Eybc 7P8nhbWqBy8nKHd/E9Z6ILmeHf6RZoVyKWbU/0trvXMw/l2BEdsX/E9afYbj887GbudB IEq8g1TpHSBoBurRM/u0DMKnm6gKTU3+F4+XeUe23YpiuqV0UC/o1lp0zTqRYE5sxIm4 I7gg== X-Received: by 10.68.235.37 with SMTP id uj5mr29344760pbc.85.1377714346616; Wed, 28 Aug 2013 11:25:46 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Wed, 28 Aug 2013 11:25:25 -0700 (PDT) In-Reply-To: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661E@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8@EXMBX23.ad.utwente.nl> From: Thomas Watteyne Date: Wed, 28 Aug 2013 11:25:25 -0700 X-Google-Sender-Auth: UUNxxC2gtNVqZZqUzMvTOIglJC0 Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/related; boundary=047d7b33c7883b6eba04e5061e42 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 18:25:48 -0000 --047d7b33c7883b6eba04e5061e42 Content-Type: multipart/alternative; boundary=047d7b33c7883b6eb704e5061e41 --047d7b33c7883b6eb704e5061e41 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Pouria, Wonderful diagram, great material to discuss over! I don't quite understand the changes you made in the second revision. In my mind, the first revision was better: - node A initiates a network join procedure - it receives some EBs - after some settable time, it uses some settable algorithm to pick a time source neighbor - it keeps synchronized to that neighbor until told otherwise. No routing information yet. - either it sends in a DIS, or waits, but in any case it receives DIOs from its neighbors - RPL works exactly as-is, and pick routing parent(s). - TSCH snoops on RPL's decision and changes time source neighbors accordingly. Does that sum it up? Thomas On Wed, Aug 28, 2013 at 11:14 AM, wrote: > Hi Qin,**** > > It absolutely makes sense.**** > > Best Wishes,**** > > Pouria**** > > ** ** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Wednesday, August 28, 2013 7:21 PM > > *To:* Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > ** ** > > Hi Pouria,**** > > ** ** > > I proposed adding "Change time source" along with "Choosing the RPL > parent" because we agreed before that the RPL parent will be used as the > time source. And, this time Xavi proposed to use the node with lowest EB' > join priority as time source is just because the RPL parent hasn't been > found at the beginning. **** > > ** ** > > Make sense?**** > > ** ** > > Qin**** > > ** ** > > ** ** > > ** ** > > ** ** > > On Thu, Aug 29, 2013 at 12:52 AM, wrote:**** > > Hi Qin,**** > > I changed the diagram based on your comment.**** > > However, I couldn=92t conclude form the discussion on =93time parent sele= ction > based on EB priority=94 thread to find out, if L3 will make the final > decision about the time source or L2.**** > > Best Wishes,**** > > Pouria**** > > **** > > **** > > *From:* Qin Wang [mailto:qinwang@berkeley.edu] > *Sent:* Wednesday, August 28, 2013 5:31 PM > *To:* Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > **** > > It is great to have the diagram as common base to discuss. I would like t= o > add "Changing time source" along with "Choosing the RPL parent", because > the time source selected at the beginning is just a temporary one, and ti= me > source in L2 should be same as the RPL parent in L3 after RPL parent is > selected.**** > > **** > > make sense?**** > > **** > > Qin**** > > **** > > **** > > On Wed, Aug 28, 2013 at 7:55 PM, wrote:**** > > Dear All,**** > > I would like to continue our discussion for choosing the time source > (either in L2 or L3) in the basic RPL. **** > > I prepared a sample of message sequence chart to show the potential > procedure for basic RPL.**** > > I think we can refer to or modify the attached slide to discuss the > details for constructing the basic RPL, as well as choosing the time sour= ce. > **** > > Best Wishes,**** > > Pouria **** > > **** > > **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Wednesday, August 21, 2013 7:45 AM**** > > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria,**** > > Glad to read we agree!**** > > Thomas**** > > **** > > On Tue, Aug 20, 2013 at 12:53 PM, wrote:**** > > Thomas,**** > > **** > > Many thanks for your explanation.**** > > I couldn=92t find the related counter in MAC PIB of IEEE 802.15.4.**** > > **** > > My first idea was using both (a) clock accuracy information and (b) RPL > rank information for choosing the best timing parent between two routers > with equal (or close) RPL rank. That would help us to avoid (1) > synchronization loop problem and (2) potential drifting problem caused by > choosing the parent, between two with equal ranks but not equal clock > accuracy.**** > > **** > > As you mentioned, let=92s not make it complicated and consider the parent > rank as a factor for choosing the timing parent.**** > > **** > > Pouria.**** > > **** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Tuesday, August 20, 2013 7:54 AM**** > > > *To:* 6TSCH > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria,**** > > Thanks for the explanation. Allow me to answer inline.**** > > Thomas**** > > **** > > On Mon, Aug 19, 2013 at 10:57 AM, wrote:**** > > Thomas,**** > > **** > > I am not expert in synchronization, so please bear with me.**** > > **** > > By clock accuracy information, I mean how accurate a node can maintain > (e.g. =B11 ms) synchronization in the network for a period of time (e.g. = 20 > s) without the need for clock update. Different devices might have > different clock accuracy values represent by parts per million (ppm) unit= . > The clock accuracy of a device might depend on the device=92 environment > conditions (e.g. temperature or shocks) and it doesn=92t just depend on > crystals hardware. Am I right?**** > > **** > > Agreed. I am used to the term "clock drift" for the phenomenon, but > absolutely, drift depends on manufacturing, voltage, temperature, and > probably other environmental factors. The amount of drift of your clock > source will dictate how often resynchronization needs to happen, given a > guard time (i.e. 1ms). Of course, all these parameters depend on each > other, so you can imagine buying a better clock source, or changing the > re-synchronization frequency, or changing the guard time.**** > > **** > > In the centralized approach, the System/Network managers, use (L2) > device clock accuracy information as well as (L3) nodes=92 topology > information (similar to node=92s rank in RPL in 6tsch distributed approac= h) > to select the potential clock sources in the network. Am I right? **** > > **** > > Hmm. I understand what you are proposing, but my first reaction is to be = a > bit afraid that basing time source neighbor selection on clock drift > information might lead to lots of complexity, for not much gain (I think)= . > If I am drifting a lot wrt to my neighbor, could I not resolve that local= ly > (through all kind of techniques we can think of), rather than involving t= he > time source neighbor selection process in that?**** > > **** > > In a distributed approach, a network device might inform their > neighbors about its (L2) clock accuracy. A new device might use this > information, as well as L3 parameters (e.g. sender RPL=92 rank), to choos= e > its timing parent.**** > > **** > > This would certainly invert the approach. Now, we let RPL select routing > parents, and then we have TSCH just use the same. If we go the other way > around, i.e. select time source neighbors, then routes, many things will > get complicated real quick, the first of which are synchronization loops.= * > *** > > **** > > If in 6tsch, we are considering the case that all the nodes in the > network have equal high clock accuracy, then let=92s consider (L3) router= =92s > rank, based on the *default OF* (as Raghuram suggest), as the only factor > for selecting timing parent.**** > > **** > > I would go that route, but maybe you have some counter example in mind?*= * > ** > > **** > > Pouria**** > > **** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Thomas Watteyne > *Sent:* Monday, August 19, 2013 4:28 AM > *To:* 6TSCH**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Pouria, all,**** > > **** > > My 2c is the following. We already agreed on the fact that a mote's (RPL) > routing parent would also be its (TSCH) time source neighbor. So why not > pick the time source neighbor based on routing information?**** > > **** > > What exactly do you mean by clock accuracy? All nodes in a TSCH network > need to be able to synchronize with one another, and I don't think we are > considering cases where that is not true.**** > > **** > > Thomas**** > > **** > > On Thu, Aug 15, 2013 at 3:07 PM, wrote:**** > > Raghuram,**** > > I agree with you that we need a method to pick a timing parent.**** > > We might need the L3 information on that, unless we can find a solution i= n > 6top to use L2 information. For example about the clock accuracy > capabilities of the device who has already joined the network. I am not > sure if this information is available in L2 and neighbor table.**** > > Best Wishes,**** > > Pouria**** > > **** > > *From:* Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] > *Sent:* Wednesday, August 14, 2013 12:57 AM > *To:* xvilajosana@eecs.berkeley.edu; Zand, P. (EWI) > *Cc:* Thomas Watteyne; 6tsch@ietf.org; Qin Wang**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Xavi, Pouria,**** > > I think we need to keep node rank at 6top (as a read only parameter > obtained from L3) in order for the TSCH nodes to figure out the timing > parent. In the case where RPL node may have different ranks based on > different OFs we need a method to pick a timing parent.**** > > **** > > We should propose a default OF, that is used to compute the ranks for the > purpose finding the timing parent.**** > > **** > > -raghuram**** > > **** > > *From: *Xavier Vilajosana Guillen > *Reply-To: * > *Date: *Tuesday, August 13, 2013 2:27 PM > *To: *Pouria Zand > *Cc: *Thomas Watteyne , "6tsch@ietf.org" < > 6tsch@ietf.org>, Qin Wang > *Subject: *Re: [6tsch] RPL on Basic**** > > **** > > Good point :-)**** > > agreed! > X**** > > **** > > On Tue, Aug 13, 2013 at 2:20 PM, wrote:**** > > Xavi,**** > > **** > > I guess we cannot keep =93node rank=94 in the 6top. Because a node might = have > different rank based on different metrics defined in L3. As a response, I > don=92t think we can get all of those information form L3 and use them in > neighbor table in 6top. Am I right? **** > > I think, as you mentioned we need to work on them. **** > > **** > > Pouria **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 11:13 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria, > > yes the neighbor table is something that 6top takes care of. The fields o= f > the table is something that we need to work on, stats for sure as describ= ed > by the basic configuration draft. As regards to the rank, in our > implementation, we keep it in the table, for each neighbour we keep its > rank. This information can be placed somewhere else if you want but I gue= ss > we need it to keep some sense on what is the rank of our neighbors.**** > > regards,**** > > Xavi**** > > **** > > **** > > On Tue, Aug 13, 2013 at 2:05 PM, wrote:**** > > Xavi,**** > > **** > > Many thanks for your complete explanation. It absolutely makes sense.**** > > **** > > Just one minor question. The neighbor table will be stored in 6top. Am I > right? If yes, do we need to store rank information (included in DIO) in > that table? Or we just store neighbor statistic?**** > > **** > > Pouria **** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 10:17 PM**** > > > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > answer inline:**** > > Xavi,**** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > there are many different ways to implement that, this is an option.**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI?**** > > These are the list of known neighbors with acceptable RSSI, so yes if it > wants to keep all of them.**** > > Or (2) the node should probe its connection with the its RPL parent and > its RPL child? In the case (2), how does the 6top can inform the L3 about > the new potential discovered neighbors and their connection status? **** > > When a node is discovered due to receiving and EB (at least in our openws= n > implementation), it is inserted at the neighbor table. At that point no > information about connectivity can be used except RSSI. As soon as a DIO = is > received from that node, its information is updated (including rank). As = we > don't have any information about connectivity (as RFC6552 describes) an > initial value is set (i.e rank + FOO). In openwsn a similar case to (1) i= s > used so eventually some stats of the link can be used to compute the ETX > and let RPL do its work. **** > > So RPL knows about a new node because 6TOP keeps information of neighbors > an eventually this information is used by RPL to update routes. As this > node sends DIOs and receives DIOs from others the information is > permanently being updated enabling a node to be positioned in the multiho= p > topology.**** > > Does it make sense?**** > > Pouria**** > > **** > > On Tue, Aug 13, 2013 at 12:40 PM, wrote:**** > > Xavi,**** > > **** > > Keep Alive timer expires for =93node A=94 after 30s if no frames have bee= n > sent (or received) to (or from) neighbor =93node B=94. Am I right?**** > > **** > > In 6top, (1) should not every node follow this scheme to probe its > connection with all the neighbors that has already received their EB with > acceptable RSSI? Or (2) the node should probe its connection with the its > RPL parent and its RPL child? In the case (2), how does the 6top can info= rm > the L3 about the new potential discovered neighbors and their connection > status? **** > > **** > > Pouria**** > > **** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* Tuesday, August 13, 2013 6:47 PM > *To:* Zand, P. (EWI) > *Cc:* Qin Wang; Thomas Watteyne; 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pouria,**** > > I completely agree with your description. Besides, there isn't a common > shared cell to send KAs. I see the operation in the following way:**** > > 6top KA timer expires and places a KA packet into the queue (e.g this > happens every 30s). TSCH layer at the begining of a shared tx/rx slot the= n > reads from the queue and sends the packet. This means that the KA can be > send in any shared slot. **** > > does it make sense? > X**** > > **** > > On Tue, Aug 13, 2013 at 7:19 AM, wrote:**** > > Dear Qin, All,**** > > I agree that Keep-alive message need to be sent in the dedicated cell to > the potential neighbor/parent, whenever the sender has not received any > packet from its neighbor/parent for a while. But, in this basic RPL, we > might use the shared cell, as a temporary solution, to send the keep-aliv= e > to a particular neighbor. For sure, if the sender packet is not > acknowledged (by the first time), the sender can=92t find, if the > transmission is collided or if the connection to the neighbor/parent is > lost. In this case I think we need to retry several times based on TSCH > retransmission algorithm on those shared cells. If all the retries fails > then the connection to the neighbor/parent is lost.**** > > Since the nodes do not need to send the keep-alive message so often, > therefore the traffic caused by Keep-alive is not too much.**** > > Am I right? **** > > BTW, do we have any common shared cell (in the whole network) to broadcas= t > the Keep-alive message periodically to let the node to be recognized by i= ts > neighbor?**** > > **** > > Best wishes,**** > > Pouria**** > > **** > > *From:*6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Qin Wang > *Sent:* Tuesday, August 13, 2013 3:19 PM > *To:* Thomas Watteyne > *Cc:* 6tsch@ietf.org**** > > > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Thomas and Xavi,**** > > **** > > I remember keep-alive usually use dedicated cell, instead of shared cell, > e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-based > schedule establishment, a child will only have shared cell. And then, > keep-alive has to use shared cell, which may result in more collision and > then traffic.**** > > **** > > Thought?**** > > **** > > Qin **** > > **** > > On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > We established a while ago that we could reuse the RPL DAG structure for > timekeeping. That is, a node's routing parent coincides with its TSCH tim= e > source neighbor. As a result, and as part of IEEE802.15.4e's normal > operation, a node keeps synchronized with its RPL parent. In the absence = of > traffic, the node will periodically "keep alive" (per Xavi's e-mail) to t= he > parent. How often depends on a number of factors, including crystal drift > and guard time, but in a typical case, a node will realize its routing > parent is missing after 30-60s.**** > > **** > > I believe this mechanism can serve for NUD, at least n the child->parent > case. Of course, this alone does no cover parent->child or NUD between > siblings. Any thoughts on the implications of limiting NUD to the > child->parent case?**** > > **** > > On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > Sure. NUD generates a reactive keep alive. Proactive heart beat that come= s > at a periodic battery drain. Question is what is the optimal way with TSC= H > for a child to find that the parent is gone, in the absence of traffic?**= * > * > > Knowing that we=92ll have (or not) EBs, and that we will (or not) time sy= nc > from the RPL parent, there is probably something we can recommend, and > limitations to the granularity that we get.**** > > **** > > Cheers,**** > > **** > > Pascal**** > > **** > > *From:* Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] > *Sent:* lundi 12 ao=FBt 2013 20:38 > *To:* Pascal Thubert (pthubert) > *Cc:* Thomas Watteyne; 6tsch@ietf.org > *Subject:* Re: [6tsch] RPL on Basic**** > > **** > > Hi Pascal, > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Keep alive packets help on that. :-)**** > > X**** > > **** > > On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) < > pthubert@cisco.com> wrote:**** > > Hello Xavi:**** > > **** > > **** > > Please see inline**** > > **** > > -RPL objective function calculation using Neighbors information described > in Basic configuration. **** > > -this includes how OF is calculated using numTx and numTxACK, etc.. *= * > ** > > **** > > *[] ***** > > -RPL configuration:**** > > - storing mode vs non-storing mode (I vote for non-storing mode for = a > basic configuration)**** > > **** > > *[] *I would MUST the non-storing and MAY the storing mode support. It=92= s > still good t enable storing mode interop for larger devices.**** > > **** > > - DIO period. Whether we use trickle algorithm (and we define the > initial period) or we use a fix period for DIO (no trickle) for basic > configuration.**** > > -DAO period, idem.**** > > *[] *I=92d seek for a recommendation from Phil on the trickle setting.***= * > > I kindly ask for opinions and contribution to this items so we can start > narrowing the content.**** > > *[] *We need to discuss NUD as well. How do we know a peer is gone > missing? Only reactive to traffic has issues like a child may never reali= ze > a parent is gone if there is no outwards traffic so it will fail to updat= e > DAO states. How can MAC mechanisms help?**** > > Some of that discussion may be spread between other drafts like the > architecture.**** > > **** > > Cheers;**** > > **** > > Pascal**** > > **** > > thanks! > X**** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > **** > > **** > > **** > > **** > > **** > > **** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > **** > > ** ** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b33c7883b6eb704e5061e41 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
    Pouria,

    Wonderful diagram, great materi= al to discuss over!

    I don't quite understand t= he changes you made in the second revision. In my mind, the first revision = was better:
    - node A initiates a network join procedure
    - it receives so= me EBs
    - after some settable time, it uses some settable algorith= m to pick a time source neighbor
    - it keeps synchronized to that = neighbor until told otherwise. No routing information yet.
    - either it sends in a DIS, or waits, but in any case it receives DIOs= from its neighbors
    - RPL works exactly as-is, and pick routing p= arent(s).
    - TSCH snoops on RPL's decision and changes time so= urce neighbors accordingly.

    Does that sum it up?

    Thomas


    On W= ed, Aug 28, 2013 at 11:14 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    It absolutely makes sense= .

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Wednesday, August 28, 2013 7:21 PM


    To: Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    =A0

    I proposed adding "Change time source" alo= ng with "Choosing the RPL parent" because we agreed before that t= he RPL parent will be used as the time source. And, this time Xavi proposed= to use the node with lowest EB' join priority as time source is just because the RPL parent hasn't been found at the beginni= ng.=A0

    =A0

    Make sense?

    =A0

    Qin

    =A0

    =A0

    =A0

    =A0

    On Thu, Aug 29, 2013 at 12:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,<= /u>

    I changed the diagram bas= ed on your comment.

    However, I couldn=92t con= clude form the discussion on =93time parent selection based on EB priority= =94 thread to find out, if L3 will make the final decision about the time sour= ce or L2.

    Best Wishes,

    Pouria

    =

    =A0<= /p>

    From: Qin Wang= [mailto:qinwang@= berkeley.edu]
    Sent: Wednesday, August 28, 2013 5:31 PM
    To: Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    =A0

    It is great to have the diagram as common base to di= scuss. I would like to add "Changing time source" along with &quo= t;Choosing the RPL parent", because the time source selected at the beginning is just a temporary one, and time source in L2 should be same as= the RPL parent in L3 after RPL parent is selected.

    =A0

    make sense?

    =A0

    Qin

    =A0

    =A0

    On Wed, Aug 28, 2013 at 7:55 PM, <P.Zand@utwente.nl> wrote:=

    Dear All,

    I would like to continue = our discussion for choosing the time source (either in L2 or L3) in the basic RPL.

    I prepared a sample of me= ssage sequence chart to show the potential procedure for basic RPL.<= u>

    I think we can refer to o= r modify the attached slide to discuss the details for constructing the basic RPL, as well as choosing the time source.

    Best Wishes,

    Pouria =A0<= u>

    <= u>

    =A0<= /p>

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 21, 2013 7:45 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    Glad to read we agree!

    Thomas

    =A0

    On Tue, Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,<= /u>

    =A0<= /p>

    Many thanks for your expl= anation.

    I couldn=92t find the rel= ated counter in MAC PIB of IEEE 802.15.4.

    =A0<= /p>

    My first idea was using b= oth (a) clock accuracy information and (b) RPL rank information for choosin= g the best timing parent between two routers with equal (or close) RPL rank.= That would help us to avoid (1) synchronization loop problem and (2) poten= tial drifting problem caused by choosing the parent, between two with equal= ranks but not equal clock accuracy.

    =A0<= /p>

    As you mentioned, let=92s= not make it complicated and consider the parent rank as a factor for choos= ing the timing parent.

    =A0<= /p>

    Pouria.<= /u>

    =A0=A0=A0=A0=A0=A0=A0

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria,

    Thanks for the explanation. Allow me to answer inlin= e.

    Thomas

    =A0

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,<= /u>

    =A0<= /p>

    I am not expert in synchr= onization, so please bear with me.

    =A0<= /p>

    By clock accuracy informa= tion, I mean how accurate a node can maintain (e.g. =B11 ms) synchronizatio= n in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device=92 environment conditions (e.g. temperature or shocks) and it doesn=92t just depend on cr= ystals hardware. Am I right?

    =A0

    Agreed. I am used to the term "clock drift"= ; for the phenomenon, but absolutely, drift depends on manufacturing, volta= ge, temperature, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronizat= ion needs to happen, given a guard time (i.e. 1ms). Of course, all these pa= rameters depend on each other, so you can imagine buying a better clock sou= rce, or changing the re-synchronization frequency, or changing the guard time.

    =A0

    =A0In the centralized app= roach, the System/Network managers, use (L2) device clock accuracy informat= ion as well as (L3) nodes=92 topology information (similar to node=92s rank in= RPL in 6tsch distributed approach) to select the potential clock sources i= n the network. Am I right?=A0

    =A0

    Hmm. I understand what you are proposing, but my fir= st reaction is to be a bit afraid that basing time source neighbor selectio= n on clock drift information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my = neighbor, could I not resolve that locally (through all kind of techniques = we can think of), rather than involving the time source neighbor selection = process in that?

    =A0

    =A0In a distributed appro= ach, a network device might inform their neighbors about its (L2) clock acc= uracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL=92 rank), to choose its timing parent.

    =A0

    This would certainly invert the approach. Now, we le= t RPL select routing parents, and then we have TSCH just use the same. If w= e go the other way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the f= irst of which are synchronization loops.

    =A0

    =A0If in 6tsch, we are co= nsidering the case that all the nodes in the network have equal high clock accuracy, then let=92s consider (L3) router=92s rank, based on the defa= ult OF (as Raghuram suggest), as the only factor for selecting timing p= arent.

    =A0<= /p>

    I would go that route, but maybe you have some count= er example in mind?

    =A0

    Pouria

    =A0<= /p>

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Pouria, all,

    =A0

    My 2c is the following. We already agreed on the fac= t that a mote's (RPL) routing parent would also be its (TSCH) time sour= ce neighbor. So why not pick the time source neighbor based on routing information?

    =A0

    What exactly do you mean by clock accuracy? All node= s in a TSCH network need to be able to synchronize with one another, and I = don't think we are considering cases where that is not true.

    =A0

    Thomas

    =A0

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:=

    Raghuram,

    I agree with you that we need a method = to pick a timing parent.

    We might need the L3 information on tha= t, unless we can find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

    =A0<= /p>

    From: Raghuram= Sudhaakar (rsudhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Xavi, Pouria,

    I think we need to keep node rank at 6t= op (as a read only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

    =A0

    We should propose a default OF, that is= used to compute the ranks for the purpose finding the timing parent.

    =A0

    -raghuram

    =A0

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Good poi= nt :-)

    agreed!
    X

    =A0

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl&= gt; wrote:

    Xavi,

    =A0<= /p>

    I guess we cannot keep = =93node rank=94 in the 6top. Because a node might have different rank based= on different metrics defined in L3. As a response, I don=92t think we can get= all of those information form L3 and use them in neighbor table in 6top. A= m I right?

    I think, as you mentioned= we need to work on them.

    =A0<= /p>

    Pouria =A0<= u>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

    =A0

    =A0

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:=

    Xavi,

    =A0<= /p>

    Many thanks for your comp= lete explanation. It absolutely makes sense.

    =A0<= /p>

    Just one minor question. = The neighbor table will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    answer inline:=

    Xavi,

    Keep Alive timer expires for =93node A=94 aft= er 30s if no frames have been sent (or received) to (or from) neighbor =93n= ode B=94. Am I right?

    there are many different ways to implement that, this is an= option.

    =A0

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about con= nectivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

    =A0

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

    =A0<= /p>

    Keep Alive timer expires = for =93node A=94 after 30s if no frames have been sent (or received) to (or from) neighbor =93node B=94. Am I right?

    =A0<= /p>

    In 6top, (1) should not e= very node follow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status? =A0=A0=A0

    =A0<= /p>

    Pouria

    =A0<= /p>

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pouria,<= /u>

    I completely agree with your description. Besides, t= here isn't a common shared cell to send KAs. I see the operation in the= following way:

    6top KA timer expires= and places a KA packet into the queue (e.g this happens every 30s). TSCH l= ayer at the begining of a shared tx/rx slot then reads from the queue and s= ends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

    =A0

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:=

    Dear Qin, All,<= /u>

    I agree that Keep-alive m= essage need to be sent in the dedicated cell to the potential neighbor/pare= nt, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can=92t find, if the transmission is colli= ded or if the connection to the neighbor/parent is lost. In this case I thi= nk we need to retry several times based on TSCH retransmission algorithm on= those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.=

    Since the nodes do not ne= ed to send the keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any commo= n shared cell (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?

    =A0<= /p>

    Best wishes,

    Pouria

    =A0<= /p>

    From:6tsch-bounces@ietf.org= [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Thomas and Xavi,

    =A0

    I remember keep-alive usually use dedicated cell, in= stead of shared cell, e.g. a Rx cell in child, and a Tx cell in parent. But= , with EB-based schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

    =A0

    Thought?

    =A0

    Qin=A0

    =A0

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    We established a while ago that we could reuse the R= PL DAG structure for timekeeping. That is, a node's routing parent coin= cides with its TSCH time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchron= ized with its RPL parent. In the absence of traffic, the node will periodic= ally "keep alive" (per Xavi's e-mail) to the parent. How ofte= n depends on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

    =A0

    I believe this mechanism can serve for NUD, at least= n the child->parent case. Of course, this alone does no cover parent-&g= t;child or NUD between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

    =A0

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:=

    =A0<= /p>

    Sure. NUD generates a rea= ctive keep alive. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we=92ll have= (or not) EBs, and that we will (or not) time sync from the RPL parent, the= re is probably something we can recommend, and limitations to the granularity= that we get.

    =A0<= /p>

    Cheers,<= /u>

    =A0<= /p>

    Pascal=

    =A0<= /p>

    From: Xavier V= ilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

    =A0

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

    =A0

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pt= hubert) <pthuber= t@cisco.com> wrote:

    Hello Xavi:<= u>

    =A0=

    =A0=

    Please see in= line

    =A0<= /p>

    -RPL objective function = calculation using Neighbors information described in Basic configuration.

    =A0=A0=A0 -this includes= how OF is calculated using numTx and numTxACK, etc..

    =A0

    []

    -RPL configuration:

    =A0=A0=A0=A0 - storing m= ode vs non-storing mode (I vote for non-storing mode for a basic configurat= ion)

    =A0

    [] I would MUST the non-storing and = MAY the storing mode support. It=92s still good t enable storing mode inter= op for larger devices.

    =A0<= /p>

    =A0=A0=A0=A0 - DIO period. Whether we use trickle al= gorithm (and we define the initial period) or we use a fix period for DIO (= no trickle) for basic configuration.

    =A0=A0=A0=A0=A0 -DAO = period, idem.

    [] I=92d seek for a recommendation f= rom Phil on the trickle setting.

    I kindly ask for opin= ions and contribution to this items so we can start narrowing the content.<= u>

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between other drafts like the a= rchitecture.

    =A0

    Cheers;

    =A0

    Pascal

    =A0

    thanks!
    X


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Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 717E021F9CBD for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 11:29:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.872 X-Spam-Level: X-Spam-Status: No, score=-1.872 tagged_above=-999 required=5 tests=[AWL=0.105, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TZSO5SjUJ5xT for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 11:29:53 -0700 (PDT) Received: from mail-pb0-x231.google.com (mail-pb0-x231.google.com [IPv6:2607:f8b0:400e:c01::231]) by ietfa.amsl.com (Postfix) with ESMTP id 923FC21F9D74 for <6tsch@ietf.org>; Wed, 28 Aug 2013 11:29:53 -0700 (PDT) Received: by mail-pb0-f49.google.com with SMTP id xb4so6589960pbc.22 for <6tsch@ietf.org>; Wed, 28 Aug 2013 11:29:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:from:date:message-id:subject:to:content-type; bh=xzwEuPNpIdMPg0caIQ1xVr0r3ACir76cpYy9nabnWJQ=; b=zlXzIItcsdvNB5swh4lHLZl8hJVs629P0i9kPLMXY1LmmTbDH+5X82lJM5aybONtv1 bx8n5753/uDHepZqX2UkP850TLu7qYApNrYhPi5G2vNDZejgTwCYgvgAxS8IAqE5ZmYM UsZ7Aglan47hnqPq7oMprHvCs1ZCDMeD5ys2pc7df9Ucj8lScX7CQsEifA+CO6ybReku yzcNLjlCQ/rctVmZ5ae36oU/Jx0XSpZ/XVb/aQknAKi+quNowuWejBEhniA5hYlNGq+f ixI8G+DCckbFa7UgYXl25reyVWyPoc5c8uasGqATJgnOYwy/jgl8I54MvP42QF8mTpLz 7L8g== X-Received: by 10.66.219.41 with SMTP id pl9mr3880260pac.187.1377714593342; Wed, 28 Aug 2013 11:29:53 -0700 (PDT) MIME-Version: 1.0 Sender: twatteyne@gmail.com Received: by 10.66.147.193 with HTTP; Wed, 28 Aug 2013 11:29:33 -0700 (PDT) From: Thomas Watteyne Date: Wed, 28 Aug 2013 11:29:33 -0700 X-Google-Sender-Auth: ZeCrJjLYq_cH9Yw8ktwlai4ZGLI Message-ID: To: 6TSCH <6tsch@ietf.org> Content-Type: multipart/alternative; boundary=047d7b5da81ff02ead04e5062ce2 Subject: [6tsch] IETF 87 minutes updloaded X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 18:30:09 -0000 --047d7b5da81ff02ead04e5062ce2 Content-Type: text/plain; charset=ISO-8859-1 All, FYI, I uploaded the minutes of the 6TSCH BoF in Berlin [1]. These are the same as the minutes we started circulating on the ML 2 weeks ago [2] and approved during the last call [3]. Thomas [1] http://www.ietf.org/proceedings/87/minutes/minutes-87-6tsch [2] https://bitbucket.org/6tsch/meetings/wiki/130730b_ietf-87_berlin_bof [3] https://bitbucket.org/6tsch/meetings/wiki/130823_webex --047d7b5da81ff02ead04e5062ce2 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    All,

    FYI, I uploaded the minutes of the= 6TSCH BoF in Berlin [1].

    These are the same as th= e minutes we started circulating on the ML 2 weeks ago [2] and approved dur= ing the last call [3].

    Thomas

    --047d7b5da81ff02ead04e5062ce2-- From P.Zand@utwente.nl Wed Aug 28 11:53:44 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AD2B121F99C0 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 11:53:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W2mBzWKhVTAF for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 11:53:44 -0700 (PDT) Received: from EXEDGE02.ad.utwente.nl (exedge02.ad.utwente.nl [130.89.5.49]) by ietfa.amsl.com (Postfix) with ESMTP id 9A05821F99A1 for <6tsch@ietf.org>; Wed, 28 Aug 2013 11:53:40 -0700 (PDT) Received: from EXHUB01.ad.utwente.nl (130.89.4.228) by EXEDGE02.ad.utwente.nl (130.89.5.49) with Microsoft SMTP Server (TLS) id 14.2.328.9; Wed, 28 Aug 2013 20:53:39 +0200 Received: from EXMBX23.ad.utwente.nl ([169.254.3.13]) by EXHUB01.ad.utwente.nl ([130.89.4.228]) with mapi id 14.02.0328.009; Wed, 28 Aug 2013 20:53:37 +0200 From: To: , <6tsch@ietf.org> Thread-Topic: [6tsch] RPL on Basic Thread-Index: AQHOlS/8hCyKDPCtk0mPphtmF0lZfJmRrKsAgAAZhoCAAAP7AIAAAoqAgADMn4CAAGoPgIAAMheggAAH+wCAADpLAIAAAGkAgAArWWD//+R/gIAAIcgA///iD4CAABkTAIADNlmggATgRgCAASNqIIAAqJmAgAEGRFCAAImCAIALgp+AgAAhcYCAADXHQP//6M0AAAYJnsD//+HBgP//2gIA Date: Wed, 28 Aug 2013 18:53:35 +0000 Message-ID: <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680D@EXMBX23.ad.utwente.nl> References: <2C3A8CAFDCAFCA41B8BF705CD9471C5B1852A60B@xmb-rcd-x04.cisco.com> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA70D7D@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA72B34@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7309B@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA76379@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA7661E@EXMBX23.ad.utwente.nl> <76EA352C3C95BB42A2C4F2EE6493AD6E4DA767A8@EXMBX23.ad.utwente.nl> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [130.89.12.149] Content-Type: multipart/related; boundary="_005_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680DEXMBX23adutwent_"; type="multipart/alternative" MIME-Version: 1.0 Subject: Re: [6tsch] RPL on Basic X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 18:53:44 -0000 --_005_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680DEXMBX23adutwent_ Content-Type: multipart/alternative; boundary="_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680DEXMBX23adutwent_" --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680DEXMBX23adutwent_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thomas, The changes are: 1. Considering more time for 6top and MAC to discover more potential = neighbor and update their statistic in neighbor table, before starting RPL. 2. The RPL might consider the neighbor statistics in 6top as well as = parent rank to select the parent. So, RPL will ask 6top about the local sta= tistics in the neighbor table by calling "read statistic request". 3. Changing the time source information in 6top and MAC, upon select= ing the new parent. I think you mean the first change. I am right? I can remove that part. Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: Wednesday, August 28, 2013 8:25 PM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Wonderful diagram, great material to discuss over! I don't quite understand the changes you made in the second revision. In my= mind, the first revision was better: - node A initiates a network join procedure - it receives some EBs - after some settable time, it uses some settable algorithm to pick a time = source neighbor - it keeps synchronized to that neighbor until told otherwise. No routing i= nformation yet. - either it sends in a DIS, or waits, but in any case it receives DIOs from= its neighbors - RPL works exactly as-is, and pick routing parent(s). - TSCH snoops on RPL's decision and changes time source neighbors according= ly. Does that sum it up? Thomas On Wed, Aug 28, 2013 at 11:14 AM, > wrote: Hi Qin, It absolutely makes sense. Best Wishes, Pouria From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Wednesday, August 28, 2013 7:21 PM To: Zand, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I proposed adding "Change time source" along with "Choosing the RPL parent"= because we agreed before that the RPL parent will be used as the time sour= ce. And, this time Xavi proposed to use the node with lowest EB' join prior= ity as time source is just because the RPL parent hasn't been found at the = beginning. Make sense? Qin On Thu, Aug 29, 2013 at 12:52 AM, > wrote: Hi Qin, I changed the diagram based on your comment. However, I couldn't conclude form the discussion on "time parent selection = based on EB priority" thread to find out, if L3 will make the final decisio= n about the time source or L2. Best Wishes, Pouria [cid:image001.jpg@01CEA430.44BD5F90] From: Qin Wang [mailto:qinwang@berkeley.edu] Sent: Wednesday, August 28, 2013 5:31 PM To: Zand, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, It is great to have the diagram as common base to discuss. I would like to = add "Changing time source" along with "Choosing the RPL parent", because th= e time source selected at the beginning is just a temporary one, and time s= ource in L2 should be same as the RPL parent in L3 after RPL parent is sele= cted. make sense? Qin On Wed, Aug 28, 2013 at 7:55 PM, > wrote: Dear All, I would like to continue our discussion for choosing the time source (eithe= r in L2 or L3) in the basic RPL. I prepared a sample of message sequence chart to show the potential procedu= re for basic RPL. I think we can refer to or modify the attached slide to discuss the details= for constructing the basic RPL, as well as choosing the time source. Best Wishes, Pouria [cid:image002.jpg@01CEA430.44BD5F90] From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Wednesday, August 21, 2013 7:45 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Glad to read we agree! Thomas On Tue, Aug 20, 2013 at 12:53 PM, > wrote: Thomas, Many thanks for your explanation. I couldn't find the related counter in MAC PIB of IEEE 802.15.4. My first idea was using both (a) clock accuracy information and (b) RPL ran= k information for choosing the best timing parent between two routers with = equal (or close) RPL rank. That would help us to avoid (1) synchronization = loop problem and (2) potential drifting problem caused by choosing the pare= nt, between two with equal ranks but not equal clock accuracy. As you mentioned, let's not make it complicated and consider the parent ran= k as a factor for choosing the timing parent. Pouria. From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Tuesday, August 20, 2013 7:54 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, Thanks for the explanation. Allow me to answer inline. Thomas On Mon, Aug 19, 2013 at 10:57 AM, > wrote: Thomas, I am not expert in synchronization, so please bear with me. By clock accuracy information, I mean how accurate a node can maintain (e.g= . =B11 ms) synchronization in the network for a period of time (e.g. 20 s) = without the need for clock update. Different devices might have different c= lock accuracy values represent by parts per million (ppm) unit. The clock a= ccuracy of a device might depend on the device' environment conditions (e.g= . temperature or shocks) and it doesn't just depend on crystals hardware. A= m I right? Agreed. I am used to the term "clock drift" for the phenomenon, but absolut= ely, drift depends on manufacturing, voltage, temperature, and probably oth= er environmental factors. The amount of drift of your clock source will dic= tate how often resynchronization needs to happen, given a guard time (i.e. = 1ms). Of course, all these parameters depend on each other, so you can imag= ine buying a better clock source, or changing the re-synchronization freque= ncy, or changing the guard time. In the centralized approach, the System/Network managers, use (L2) device = clock accuracy information as well as (L3) nodes' topology information (sim= ilar to node's rank in RPL in 6tsch distributed approach) to select the pot= ential clock sources in the network. Am I right? Hmm. I understand what you are proposing, but my first reaction is to be a = bit afraid that basing time source neighbor selection on clock drift inform= ation might lead to lots of complexity, for not much gain (I think). If I a= m drifting a lot wrt to my neighbor, could I not resolve that locally (thro= ugh all kind of techniques we can think of), rather than involving the time= source neighbor selection process in that? In a distributed approach, a network device might inform their neighbors a= bout its (L2) clock accuracy. A new device might use this information, as w= ell as L3 parameters (e.g. sender RPL' rank), to choose its timing parent. This would certainly invert the approach. Now, we let RPL select routing pa= rents, and then we have TSCH just use the same. If we go the other way arou= nd, i.e. select time source neighbors, then routes, many things will get co= mplicated real quick, the first of which are synchronization loops. If in 6tsch, we are considering the case that all the nodes in the network= have equal high clock accuracy, then let's consider (L3) router's rank, ba= sed on the default OF (as Raghuram suggest), as the only factor for selecti= ng timing parent. I would go that route, but maybe you have some counter example in mind? Pouria From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyn= e Sent: Monday, August 19, 2013 4:28 AM To: 6TSCH Subject: Re: [6tsch] RPL on Basic Pouria, all, My 2c is the following. We already agreed on the fact that a mote's (RPL) r= outing parent would also be its (TSCH) time source neighbor. So why not pic= k the time source neighbor based on routing information? What exactly do you mean by clock accuracy? All nodes in a TSCH network nee= d to be able to synchronize with one another, and I don't think we are cons= idering cases where that is not true. Thomas On Thu, Aug 15, 2013 at 3:07 PM, > wrote: Raghuram, I agree with you that we need a method to pick a timing parent. We might need the L3 information on that, unless we can find a solution in = 6top to use L2 information. For example about the clock accuracy capabiliti= es of the device who has already joined the network. I am not sure if this = information is available in L2 and neighbor table. Best Wishes, Pouria From: Raghuram Sudhaakar (rsudhaak) [mailto:rsudhaak@cisco.com] Sent: Wednesday, August 14, 2013 12:57 AM To: xvilajosana@eecs.berkeley.edu; Za= nd, P. (EWI) Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang Subject: Re: [6tsch] RPL on Basic Xavi, Pouria, I think we need to keep node rank at 6top (as a read only parameter obtaine= d from L3) in order for the TSCH nodes to figure out the timing parent. In = the case where RPL node may have different ranks based on different OFs we = need a method to pick a timing parent. We should propose a default OF, that is used to compute the ranks for the p= urpose finding the timing parent. -raghuram From: Xavier Vilajosana Guillen > Reply-To: > Date: Tuesday, August 13, 2013 2:27 PM To: Pouria Zand > Cc: Thomas Watteyne >, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang = > Subject: Re: [6tsch] RPL on Basic Good point :-) agreed! X On Tue, Aug 13, 2013 at 2:20 PM, > wrote: Xavi, I guess we cannot keep "node rank" in the 6top. Because a node might have d= ifferent rank based on different metrics defined in L3. As a response, I do= n't think we can get all of those information form L3 and use them in neigh= bor table in 6top. Am I right? I think, as you mentioned we need to work on them. Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 11:13 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This i= nformation can be placed somewhere else if you want but I guess we need it = to keep some sense on what is the rank of our neighbors. regards, Xavi On Tue, Aug 13, 2013 at 2:05 PM, > wrote: Xavi, Many thanks for your complete explanation. It absolutely makes sense. Just one minor question. The neighbor table will be stored in 6top. Am I ri= ght? If yes, do we need to store rank information (included in DIO) in that= table? Or we just store neighbor statistic? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 10:17 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, answer inline: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? there are many different ways to implement that, this is an option. In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? These are the list of known neighbors with acceptable RSSI, so yes if it wa= nts to keep all of them. Or (2) the node should probe its connection with the its RPL parent and its= RPL child? In the case (2), how does the 6top can inform the L3 about the = new potential discovered neighbors and their connection status? When a node is discovered due to receiving and EB (at least in our openwsn = implementation), it is inserted at the neighbor table. At that point no inf= ormation about connectivity can be used except RSSI. As soon as a DIO is re= ceived from that node, its information is updated (including rank). As we d= on't have any information about connectivity (as RFC6552 describes) an init= ial value is set (i.e rank + FOO). In openwsn a similar case to (1) is used= so eventually some stats of the link can be used to compute the ETX and le= t RPL do its work. So RPL knows about a new node because 6TOP keeps information of neighbors a= n eventually this information is used by RPL to update routes. As this node= sends DIOs and receives DIOs from others the information is permanently be= ing updated enabling a node to be positioned in the multihop topology. Does it make sense? Pouria On Tue, Aug 13, 2013 at 12:40 PM, > wrote: Xavi, Keep Alive timer expires for "node A" after 30s if no frames have been sent= (or received) to (or from) neighbor "node B". Am I right? In 6top, (1) should not every node follow this scheme to probe its connecti= on with all the neighbors that has already received their EB with acceptabl= e RSSI? Or (2) the node should probe its connection with the its RPL parent= and its RPL child? In the case (2), how does the 6top can inform the L3 ab= out the new potential discovered neighbors and their connection status? Pouria From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: Tuesday, August 13, 2013 6:47 PM To: Zand, P. (EWI) Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pouria, I completely agree with your description. Besides, there isn't a common sha= red cell to send KAs. I see the operation in the following way: 6top KA timer expires and places a KA packet into the queue (e.g this happe= ns every 30s). TSCH layer at the begining of a shared tx/rx slot then reads= from the queue and sends the packet. This means that the KA can be send in= any shared slot. does it make sense? X On Tue, Aug 13, 2013 at 7:19 AM, > wrote: Dear Qin, All, I agree that Keep-alive message need to be sent in the dedicated cell to th= e potential neighbor/parent, whenever the sender has not received any packe= t from its neighbor/parent for a while. But, in this basic RPL, we might us= e the shared cell, as a temporary solution, to send the keep-alive to a par= ticular neighbor. For sure, if the sender packet is not acknowledged (by th= e first time), the sender can't find, if the transmission is collided or if= the connection to the neighbor/parent is lost. In this case I think we nee= d to retry several times based on TSCH retransmission algorithm on those sh= ared cells. If all the retries fails then the connection to the neighbor/pa= rent is lost. Since the nodes do not need to send the keep-alive message so often, theref= ore the traffic caused by Keep-alive is not too much. Am I right? BTW, do we have any common shared cell (in the whole network) to broadcast = the Keep-alive message periodically to let the node to be recognized by its= neighbor? Best wishes, Pouria From:6tsch-bounces@ietf.org [mailto:6tsch-bo= unces@ietf.org] On Behalf Of Qin Wang Sent: Tuesday, August 13, 2013 3:19 PM To: Thomas Watteyne Cc: 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Thomas and Xavi, I remember keep-alive usually use dedicated cell, instead of shared cell, e= .g. a Rx cell in child, and a Tx cell in parent. But, with EB-based schedul= e establishment, a child will only have shared cell. And then, keep-alive h= as to use shared cell, which may result in more collision and then traffic. Thought? Qin On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne > wrote: We established a while ago that we could reuse the RPL DAG structure for ti= mekeeping. That is, a node's routing parent coincides with its TSCH time so= urce neighbor. As a result, and as part of IEEE802.15.4e's normal operation= , a node keeps synchronized with its RPL parent. In the absence of traffic,= the node will periodically "keep alive" (per Xavi's e-mail) to the parent.= How often depends on a number of factors, including crystal drift and guar= d time, but in a typical case, a node will realize its routing parent is mi= ssing after 30-60s. I believe this mechanism can serve for NUD, at least n the child->parent ca= se. Of course, this alone does no cover parent->child or NUD between siblin= gs. Any thoughts on the implications of limiting NUD to the child->parent c= ase? On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Sure. NUD generates a reactive keep alive. Proactive heart beat that comes = at a periodic battery drain. Question is what is the optimal way with TSCH = for a child to find that the parent is gone, in the absence of traffic? Knowing that we'll have (or not) EBs, and that we will (or not) time sync f= rom the RPL parent, there is probably something we can recommend, and limit= ations to the granularity that we get. Cheers, Pascal From: Xavier Vilajosana Guillen [mailto:xvilajosana@eecs.berkeley.edu] Sent: lundi 12 ao=FBt 2013 20:38 To: Pascal Thubert (pthubert) Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] RPL on Basic Hi Pascal, [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Keep alive packets help on that. :-) X On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) > wrote: Hello Xavi: Please see inline -RPL objective function calculation using Neighbors information described i= n Basic configuration. -this includes how OF is calculated using numTx and numTxACK, etc.. [] -RPL configuration: - storing mode vs non-storing mode (I vote for non-storing mode for a = basic configuration) [] I would MUST the non-storing and MAY the storing mode support. It's stil= l good t enable storing mode interop for larger devices. - DIO period. Whether we use trickle algorithm (and we define the init= ial period) or we use a fix period for DIO (no trickle) for basic configura= tion. -DAO period, idem. [] I'd seek for a recommendation from Phil on the trickle setting. I kindly ask for opinions and contribution to this items so we can start na= rrowing the content. [] We need to discuss NUD as well. How do we know a peer is gone missing? O= nly reactive to traffic has issues like a child may never realize a parent = is gone if there is no outwards traffic so it will fail to update DAO state= s. How can MAC mechanisms help? Some of that discussion may be spread between other drafts like the archite= cture. Cheers; Pascal thanks! X _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680DEXMBX23adutwent_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Thomas,=

    The changes are:

    1. = ;      Considering more time for 6top and MAC to discover more potential n= eighbor and update their statistic in neighbor table, before starting RPL.

    2. = ;      The RPL might consider the neighbor statistics in 6top as well as p= arent rank to select the parent. So, RPL will ask 6top about the local statistics in the neighbor table by calling “read s= tatistic request”.

    3. = ;       Changing the time source information in 6top and MAC, upon se= lecting the new parent.

    I think you mean the firs= t change. I am right?

    I can remove that part.

    Pouria

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 28, 2013 8:25 PM
    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

     

    Wonderful diagram, great material to discuss over!

     

    I don't quite understand the changes you made in the= second revision. In my mind, the first revision was better:

    - node A initiates a network join procedure

    - it receives some EBs

    - after some settable time, it uses some settable al= gorithm to pick a time source neighbor

    - it keeps synchronized to that neighbor until told = otherwise. No routing information yet.

    - either it sends in a DIS, or waits, but in any cas= e it receives DIOs from its neighbors

    - RPL works exactly as-is, and pick routing parent(s= ).

    - TSCH snoops on RPL's decision and changes time sou= rce neighbors accordingly.

     

    Does that sum it up?

     

    Thomas

     

    On Wed, Aug 28, 2013 at 11:14 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    It absolutely makes sense.<= /o:p>

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Wednesday, August 28, 2013 7:21 PM

     

    Hi Pouria,

     

    I proposed adding "Change time source" along with "= Choosing the RPL parent" because we agreed before that the RPL parent = will be used as the time source. And, this time Xavi proposed to use the node with lowest EB' join priority as time source is just becau= se the RPL parent hasn't been found at the beginning. 

     

    Make sense?

     

    Qin

     

     

     

     

    On Thu, Aug 29, 2013 at 12:52 AM, <P.Zand@utwente.nl> wrote:

    Hi Qin,

    I changed the diagram based on your com= ment.

    However, I couldn’t conclude form= the discussion on “time parent selection based on EB priority” thread to find out, if L3 will make the final decision about the time sour= ce or L2.

    Best Wishes,

    Pouria

     

    From: Qin Wang [mailto:qinwang@berkeley.edu]
    Sent: Wednesday, August 28, 2013 5:31 PM
    To: Zand, P. (EWI)
    Cc: Thomas Watteyne;     6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

     

    It is great to have the diagram as common base to discuss. I would= like to add "Changing time source" along with "Choosing the= RPL parent", because the time source selected at the beginning is just a temporary one, and time source in L2 should be same as= the RPL parent in L3 after RPL parent is selected.

     

    make sense?

     

    Qin

     

     

    On Wed, Aug 28, 2013 at 7:55 PM, <P.Zand@utwente.nl> wrote:

    Dear All,

    I would like to continue our discussion= for choosing the time source (either in L2 or L3) in the basic RPL.

    I prepared a sample of message sequence= chart to show the potential procedure for basic RPL.

    I think we can refer to or modify the a= ttached slide to discuss the details for constructing the basic RPL, as well as choosing the time source.

    Best Wishes,

    Pouria  

     

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 21, 2013 7:45 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Glad to read we agree!

    Thomas

     

    On Tue, Aug 20, 2013 at 12:53 PM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    Many thanks for your explanation.

    I couldn’t find the related count= er in MAC PIB of IEEE 802.15.4.

     

    My first idea was using both (a) clock = accuracy information and (b) RPL rank information for choosing the best timing parent between two routers with equal (or close) RPL rank.= That would help us to avoid (1) synchronization loop problem and (2) poten= tial drifting problem caused by choosing the parent, between two with equal= ranks but not equal clock accuracy.

     

    As you mentioned, let’s not make = it complicated and consider the parent rank as a factor for choosing the timing parent.

     

    Pouria.

          &nb= sp;

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Tuesday, August 20, 2013 7:54 AM


    To: 6TSCH
    Subject: Re: [6tsch] RPL on Basic

     

    Pouria,

    Thanks for the explanation. Allow me to answer inline.<= /p>

    Thomas

     

    On Mon, Aug 19, 2013 at 10:57 AM, <P.Zand@utwente.nl> wrote:

    Thomas,

     

    I am not expert in synchronization, so = please bear with me.

     

    By clock accuracy information, I mean h= ow accurate a node can maintain (e.g. =B11 ms) synchronization in the network for a period of time (e.g. 20 s) without the need for clock= update. Different devices might have different clock accuracy values repre= sent by parts per million (ppm) unit. The clock accuracy of a device might = depend on the device’ environment conditions (e.g. temperature or shocks) and it doesn’t just depend o= n crystals hardware. Am I right?

     

    Agreed. I am used to the term "clock drift" for the phen= omenon, but absolutely, drift depends on manufacturing, voltage, temperatur= e, and probably other environmental factors. The amount of drift of your clock source will dictate how often resynchronizat= ion needs to happen, given a guard time (i.e. 1ms). Of course, all these pa= rameters depend on each other, so you can imagine buying a better clock sou= rce, or changing the re-synchronization frequency, or changing the guard time.

     

     In the centralized approach, the = System/Network managers, use (L2) device clock accuracy information as well as (L3) nodes’ topology information (similar to node’s= rank in RPL in 6tsch distributed approach) to select the potential clock s= ources in the network. Am I right? 

     

    Hmm. I understand what you are proposing, but my first reaction is= to be a bit afraid that basing time source neighbor selection on clock dri= ft information might lead to lots of complexity, for not much gain (I think). If I am drifting a lot wrt to my = neighbor, could I not resolve that locally (through all kind of techniques = we can think of), rather than involving the time source neighbor selection = process in that?

     

     In a distributed approach, a netw= ork device might inform their neighbors about its (L2) clock accuracy. A new device might use this information, as well as L3 parameters (e.g. se= nder RPL’ rank), to choose its timing parent.

     

    This would certainly invert the approach. Now, we let RPL select r= outing parents, and then we have TSCH just use the same. If we go the other= way around, i.e. select time source neighbors, then routes, many things will get complicated real quick, the f= irst of which are synchronization loops.

     

     If in 6tsch, we are considering t= he case that all the nodes in the network have equal high clock accuracy, then let’s consider (L3) router’s rank, based on the= default OF (as Raghuram suggest), as the only factor for selecting = timing parent.

     

    I would go that route, but maybe you have some counter example in = mind?

     

    Pouria

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Monday, August 19, 2013 4:28 AM
    To: 6TSCH


    Subject: Re: [6tsch] RPL on Basic

     

    Pouria, all,

     

    My 2c is the following. We already agreed on the fact that a mote'= s (RPL) routing parent would also be its (TSCH) time source neighbor. So wh= y not pick the time source neighbor based on routing information?

     

    What exactly do you mean by clock accuracy? All nodes in a TSCH ne= twork need to be able to synchronize with one another, and I don't think we= are considering cases where that is not true.

     

    Thomas

     

    On Thu, Aug 15, 2013 at 3:07 PM, <P.Zand@utwente.nl> wrote:

    Raghuram,

    I agree with you that we need a method to pick a timi= ng parent.

    We might need the L3 information on that, unless we c= an find a solution in 6top to use L2 information. For example about the clock accuracy capabilities of the device who has already joined= the network. I am not sure if this information is available in L2 and neig= hbor table.

    Best Wishes,

    Pouria

     

    From: Raghuram Sudhaakar (rs= udhaak) [mailto:rsudhaak@c= isco.com]
    Sent: Wednesday, August 14, 2013 12:57 AM
    To: xvilajosana@eecs.berkeley.edu; Zand, P. (EWI)
    Cc: Thomas Watteyne; 6tsch@ietf.org; Qin Wang


    Subject: Re: [6tsch] RPL on Basic

     

    Xavi, Pouria,

    I think we need to keep node rank at 6top (as a read = only parameter obtained from L3) in order for the TSCH nodes to figure out the timing parent. In the case where RPL node may have diffe= rent ranks based on different OFs we need a method to pick a timing parent.=

     

    We should propose a default OF, that is used to compu= te the ranks for the purpose finding the timing parent.

     

    -raghuram

     

    From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu= >
    Reply-To: <xvilajosana@eecs.berkeley.edu>
    Date: Tuesday, August 13, 2013 2:27 PM
    To: Pouria Zand <P.Zand@utwente.nl>
    Cc: Thomas Watteyne <watteyne@eecs.berkeley.edu>, "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang <qin= wang@berkeley.edu>
    Subject: Re: [6tsch] RPL on Basic

     

    Good point :-)

    agreed!
    X

     

    On Tue, Aug 13, 2013 at 2:20 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    I guess we cannot keep “node rank= ” in the 6top. Because a node might have different rank based on different metrics defined in L3. As a response, I don’t think we can= get all of those information form L3 and use them in neighbor table in 6to= p. Am I right?

    I think, as you mentioned we need to wo= rk on them.

     

    Pouria  

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 11:13 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    yes the neighbor table is something that 6top takes care of. The fields of = the table is something that we need to work on, stats for sure as described= by the basic configuration draft. As regards to the rank, in our implement= ation, we keep it in the table, for each neighbour we keep its rank. This information can be placed somewh= ere else if you want but I guess we need it to keep some sense on what is t= he rank of our neighbors.

    regards,

    Xavi

     

     

    On Tue, Aug 13, 2013 at 2:05 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Many thanks for your complete explanati= on. It absolutely makes sense.

     

    Just one minor question. The neighbor t= able will be stored in 6top. Am I right? If yes, do we need to store rank information (included in DIO) in that table? Or we just stor= e neighbor statistic?

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 10:17 PM


    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    answer inline:

    Xavi,

    Keep Alive timer expires for “node A= 221; after 30s if no frames have been sent (or received) to (or from) neigh= bor “node B”. Am I right?

    there are many different ways to implement that, this is an= option.

     

    In 6top, (1) should not every node follow thi= s scheme to probe its connection with all the neighbors that has already re= ceived their EB with acceptable RSSI?

    These are the list of known neighbors with acceptable RSSI,= so yes if it wants to keep all of them.

    Or (2) the node should probe its connection w= ith the its RPL parent and its RPL child? In the case (2), how does the 6to= p can inform the L3 about the new potential discovered neighbors and their connection status?

    When a node is discovered due to receiving and EB (at least= in our openwsn implementation), it is inserted at the neighbor table. At t= hat point no information about connectivity can be used except RSSI. As soon as a DIO is received from that node, its information = is updated (including rank). As we don't have any information about connect= ivity (as RFC6552 describes) an initial value is set (i.e rank + FOO). = In openwsn a similar case to (1) is used so eventually some stats of the link can be used to compute the ETX a= nd let RPL do its work.

    So RPL knows about a new node because 6TOP keeps informatio= n of neighbors an eventually this information is used by RPL to update rout= es. As this node sends DIOs and receives DIOs from others the information is permanently being updated enabling a node to be positio= ned in the multihop topology.

    Does it make sense?

    Pouria

     

    On Tue, Aug 13, 2013 at 12:40 PM, <P.Zand@utwente.nl> wrote:

    Xavi,

     

    Keep Alive timer expires for “nod= e A” after 30s if no frames have been sent (or received) to (or from) neighbor “node B”. Am I right?

     

    In 6top, (1) should not every node foll= ow this scheme to probe its connection with all the neighbors that has already received their EB with acceptable RSSI? Or (2) the node s= hould probe its connection with the its RPL parent and its RPL child? In th= e case (2), how does the 6top can inform the L3 about the new potential dis= covered neighbors and their connection status?    

     

    Pouria

     

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: Tuesday, August 13, 2013 6:47 PM
    To: Zand, P. (EWI)
    Cc: Qin Wang; Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pouria,

    I completely agree with your description. Besides, there isn't a c= ommon shared cell to send KAs. I see the operation in the following way:

    6top KA timer expires and places a KA packet into the queue (e.g this ha= ppens every 30s). TSCH layer at the begining of a shared tx/rx slot then re= ads from the queue and sends the packet. This means that the KA can be send in any shared slot.

    does it make sense?
    X

     

    On Tue, Aug 13, 2013 at 7:19 AM, <P.Zand@utwente.nl> wrote:

    Dear Qin, All,

    I agree that Keep-alive message need to= be sent in the dedicated cell to the potential neighbor/parent, whenever the sender has not received any packet from its neighbor/parent f= or a while. But, in this basic RPL, we might use the shared cell, as a temp= orary solution, to send the keep-alive to a particular neighbor. For sure, = if the sender packet is not acknowledged (by the first time), the sender can’t find, if the transmission is c= ollided or if the connection to the neighbor/parent is lost. In this case I= think we need to retry several times based on TSCH retransmission algorith= m on those shared cells. If all the retries fails then the connection to the neighbor/parent is lost.

    Since the nodes do not need to send the= keep-alive message so often, therefore the traffic caused by Keep-alive is not too much.

    Am I right?

    BTW, do we have any common shared cell = (in the whole network) to broadcast the Keep-alive message periodically to let the node to be recognized by its neighbor?=

     

    Best wishes,

    Pouria

     

    From:6tsch-bounces@ietf.org [mailto:6tsch-= bounces@ietf.org] On Behalf Of Qin Wang
    Sent: Tuesday, August 13, 2013 3:19 PM
    To: Thomas Watteyne
    Cc: 6tsch@ietf.o= rg


    Subject: Re: [6tsch] RPL on Basic

     

    Hi Thomas and Xavi,

     

    I remember keep-alive usually use dedicated cell, instead of share= d cell, e.g. a Rx cell in child, and a Tx cell in parent. But, with EB-base= d schedule establishment, a child will only have shared cell. And then, keep-alive has to use shared cell, which = may result in more collision and then traffic.

     

    Thought?

     

    Qin 

     

    On Tue, Aug 13, 2013 at 2:59 PM, Thomas Watteyne <watteyne@eecs.berkeley.e= du> wrote:

    We established a while ago that we could reuse the RPL DAG structu= re for timekeeping. That is, a node's routing parent coincides with its TSC= H time source neighbor. As a result, and as part of IEEE802.15.4e's normal operation, a node keeps synchronized= with its RPL parent. In the absence of traffic, the node will periodically= "keep alive" (per Xavi's e-mail) to the parent. How often depend= s on a number of factors, including crystal drift and guard time, but in a typical case, a node will realize its routi= ng parent is missing after 30-60s.

     

    I believe this mechanism can serve for NUD, at least n the child-&= gt;parent case. Of course, this alone does no cover parent->child or NUD= between siblings. Any thoughts on the implications of limiting NUD to the child->parent case?

     

    On Mon, Aug 12, 2013 at 11:46 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

    Sure. NUD generates a reactive keep ali= ve. Proactive heart beat that comes at a periodic battery drain. Question is what is the optimal way with TSCH for a child to find t= hat the parent is gone, in the absence of traffic?

    Knowing that we’ll have (or not) = EBs, and that we will (or not) time sync from the RPL parent, there is probably something we can recommend, and limitations to the granularity= that we get.

     

    Cheers,

     

    Pascal

     

    From: Xavier Vilajosana Guil= len [mailto:xvilajosana@eecs.berkeley.edu]
    Sent: lundi 12 ao=FBt 2013 20:38
    To: Pascal Thubert (pthubert)
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] RPL on Basic

     

    Hi Pascal,

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Keep alive packets help on that. :-)

    X

     

    On Mon, Aug 12, 2013 at 11:23 AM, Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:

    Hello Xavi:

     

     

    Please see inline

     

    -RPL objective function calculation us= ing Neighbors information described in Basic configuration.

        -this includes how = OF is calculated using numTx and numTxACK, etc..

     

    []

    -RPL configuration:<= /p>

         - storing mod= e vs non-storing mode (I vote for non-storing mode for a basic configuratio= n)

     

    [] I would MUST the non-storing and = MAY the storing mode support. It’s still good t enable storing mode i= nterop for larger devices.

     

         - DIO period. Whether we use trickle algo= rithm (and we define the initial period) or we use a fix period for DIO (no= trickle) for basic configuration.

          -DAO period, idem.

    [] I’d seek for a recommendati= on from Phil on the trickle setting.

    I kindly ask for opinions and contribution to this items so we can start= narrowing the content.

    [] We need to discuss NUD as well. H= ow do we know a peer is gone missing? Only reactive to traffic has issues l= ike a child may never realize a parent is gone if there is no outwards traffic so it will fail to update DAO states. How can MAC m= echanisms help?

    Some of that discussion may be spread between= other drafts like the architecture.

     

    Cheers;

     

    Pascal

     

    thanks!
    X


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oAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiig AooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKAC iiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKK KKAP/9k= --_005_76EA352C3C95BB42A2C4F2EE6493AD6E4DA7680DEXMBX23adutwent_-- From qinwang@berkeley.edu Wed Aug 28 13:49:03 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EB12021E8095 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 13:49:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.921 X-Spam-Level: X-Spam-Status: No, score=-2.921 tagged_above=-999 required=5 tests=[AWL=0.055, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NupXdXiV7qi0 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 13:48:59 -0700 (PDT) Received: from mail-vc0-f178.google.com (mail-vc0-f178.google.com [209.85.220.178]) by ietfa.amsl.com (Postfix) with ESMTP id 871CE11E81C7 for <6tsch@ietf.org>; Wed, 28 Aug 2013 13:48:57 -0700 (PDT) Received: by mail-vc0-f178.google.com with SMTP id ha12so4661949vcb.9 for <6tsch@ietf.org>; Wed, 28 Aug 2013 13:48:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=VmgpjRNrxoVhigFeoIqad0+ey7OjnCLNQIgPvYexvqY=; b=O9zUTLOKuUM3zmIFYmvpEW/4B1lhOsvijrKLh2SRBHet3Q5B0V3e/rT6HR3dAG8vLL QKEJW3b+s9taiRQyRshScSPNytra9VkZ04eBUWu8vAmpF2hLM1AFrL+jy/H/hK8dTktq lLsnvM4D5aR21zLJcVkhHmIpXxy0fEA72GagzgZf905EbGVWrVY34FJWy+30xjZGD+SF Hf5wXqwADx6g8Odm/OT8TLf7mXB0vqndDLc5RjfADGLH9flQhjvnRpKrft6Br5gl1VIu MWg96wTft1fixIFp7xb9eeugEf1Q+V9GsbCNa1K7+u/ZeJuWl3HryFIpZ7d3YXPFvTwF ojug== X-Gm-Message-State: ALoCoQnt/JTi+fbZ/xC6++40Fqjl0jbrqPEH35+XhxEqMCEbsXyiQhHRZUnsaW09dTnTIBa+AuhV MIME-Version: 1.0 X-Received: by 10.58.54.70 with SMTP id h6mr642341vep.36.1377722935813; Wed, 28 Aug 2013 13:48:55 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Wed, 28 Aug 2013 13:48:55 -0700 (PDT) In-Reply-To: References: Date: Thu, 29 Aug 2013 04:48:55 +0800 Message-ID: From: Qin Wang To: Thomas Watteyne Content-Type: multipart/alternative; boundary=089e0122ad0630622504e5081e2b Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 20:49:04 -0000 --089e0122ad0630622504e5081e2b Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thomas, I agree to the 4 control flows. One more question for the two node->ME flows: Is a Confirmation from ME to node needed? Thanks Qin On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne wrote: > All, > > If possible, let's keep things simple and stick closely to the charter, > certainly for now. > > I would like to propose the following assumptions: > > - let's assume signaling and data packets are independent. > IMO, signaling packets are either short and infrequent (events, > commands), or periodic and large (statistics). Once we have run a numb= er of > networks, and can quantify the trade-offs, we can consider piggybackin= g. > - let's consider the steps highlighted in the charter, for now: > - draft-vilajosana-6tsch-basic gives us a network with minimal > connectivity between all nodes in the network. Most of the schedule= is > empty, available ot some dynamic scheduler. > - the scheduler uses the minimal connectivity to communicate, > either between neighbors (distributed), or between nodes and the PC= E > (centralized) > > If we agree with this, I propose we go back to discussing the types of > flows, per the name of this thread. I'd like to call on a rough consensus > for the following 4 flows: > > - ME->node > - action > - query > - node->ME > - report > - event > > Thomas > > > > On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang wrote: > >> Thomas, >> >> I agree to keep different alternatives, at lease as options. >> >> Regarding to what kinds of cells should be used for conveying the report= , >> shared cells or dedicated cells, I would like to leave them to >> configuration. What do you think? >> >> Thanks >> Qin >> >> >> >> On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne < >> watteyne@eecs.berkeley.edu> wrote: >> >>> Qin, >>> >>> You bring up a good point: over what cells with the reports travel? >>> Another questions could be: over what cells will the request to install >>> cells travel? I believe that, whatever the policy in place in the netwo= rk, >>> there will always need to be some cells installed for infrequent signal= ing >>> traffic. If the report rate is very slow, it might qualify as "infreque= nt >>> signaling traffic". For sure, the request to change the schedule qualif= ies. >>> >>> Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted >>> Aloha schedule indicated in the draft can be used for the signaling tra= ffic >>> between the nodes and the ME. Of course, if the report rate is very hig= h, >>> some dedicate track might be installed, but I do not believe this is >>> needed, certainly not this early on. >>> >>> I agree with Diego that keeping the solution open to different >>> alternative is key. >>> >>> Thomas >>> >>> >>> On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne < >>> diego.dujovne@mail.udp.cl> wrote: >>> >>>> Qin, Thomas, >>>> Alternative (1) adds delay to define the slots to send the event >>>> to the ME (propagate the new schedule), >>>> while alternative (2) keeps reserved slots waiting for the event to >>>> happen. >>>> I think both alternatives should be included, and configured by the ME >>>> depending >>>> on the network requirements. >>>> >>>> More thoughts? >>>> >>>> Diego Dujovne >>>> >>>> 2013/8/27 Qin Wang : >>>> > Thomas, >>>> > >>>> > I agree with almost all. Only some comments on "Report Flow". >>>> > >>>> > As you mentioned, there are two kinds of report scenarios, one is >>>> > periodically report, another one is burst report or called as >>>> event-driven >>>> > report. I have no question on how periodically report works, which y= ou >>>> > described. But I'm not sure what the best way to handle event-driven >>>> report >>>> > is. I think we don't want to assume 6top sublayer is very >>>> intelligent, in >>>> > another word, the events and the trigger of events should be >>>> configured by >>>> > ME, just like the interval of periodically report. Make sense? >>>> > >>>> > If you agree to it, the remained issue is when and how the bandwidt= h >>>> for >>>> > sending event-driven reports is reserved. Here are two ways I can se= e. >>>> > (1) when a event is triggered, node sends a request to ME and ask >>>> some BW to >>>> > send the report. I believe that is how the 4th control flow works. >>>> > (2) when ME configure the events and their triggers, ME also >>>> provisions some >>>> > BW for the node which allows the node to send the report triggered b= y >>>> some >>>> > event. >>>> > >>>> > I have no strong opinion on which one is better. But, the bottom lin= e >>>> is the >>>> > configuration of the set of events and their triggers should be out >>>> of 6top >>>> > scope. Thought? >>>> > >>>> > Thanks >>>> > Qin >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne < >>>> twatteyne@linear.com> >>>> > wrote: >>>> >> >>>> >> Qin, >>>> >> >>>> >> Please correct me if I'm wrong: >>>> >> - Action Flow (ME->6top). ME asks 6top to execute some command. >>>> Typical >>>> >> commands are add/delete cells. >>>> >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >>>> >> queries are about current cells usage or statistics. >>>> >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical >>>> reported >>>> >> information covers cells usage or statistics. >>>> >> >>>> >> Questions: >>>> >> - Looks like Query and Report flows contain the same information. I= n >>>> >> normal operation, the Report flow should be enough, the Query flow >>>> only >>>> >> being used in special cases, for example when the ME has lost state >>>> (just >>>> >> booted, bug, etc). Agreed? >>>> >> - The ME should be able to configure the report flow. Configuration >>>> could >>>> >> be "send report every X seconds" or "send report when variable X >>>> larger than >>>> >> Y". I imagine this could be done over the action flow? Agreed? >>>> >> - A node will want to report an urgent event to the ME. One such >>>> events is >>>> >> "the topology appears to have changed". There any many cases where >>>> this >>>> >> information needs to be sent immediately, i.e. no time to wait for >>>> the next >>>> >> report cycle. We can consider this to be an asynchronous report, or >>>> part of >>>> >> a new "Event" flow. >>>> >> - Same for the mote asking the ME for a schedule update. >>>> >> >>>> >> Thoughts? >>>> >> >>>> >> Thomas >>>> >> >>>> >> >>>> >> >>>> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang >>>> wrote: >>>> >>> >>>> >>> Xavi, >>>> >>> >>>> >>> Approach-(2) is more flexible and likely covers more situations. >>>> But, it >>>> >>> may bring some complexity to 6top, because 6top has to make >>>> decision on the >>>> >>> bandwidth request (add/delete), which needs some metrics, some >>>> intelligence. >>>> >>> >>>> >>> What do you think? >>>> >>> >>>> >>> Qin >>>> >>> >>>> >>> >>>> >>> >>>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>>> >>> wrote: >>>> >>>> >>>> >>>> Hi Qin, I like your (2). >>>> >>>> >>>> >>>> Note also that there are situations that might have some >>>> differences. >>>> >>>> >>>> >>>> 1-the track already exists. >>>> >>>> 2-the track between the two entities does not exists >>>> >>>> >>>> >>>> in either case I think that the node that requires certain BW to >>>> another >>>> >>>> node should talk to 6top, which processes that request and sends = a >>>> request >>>> >>>> to the ME, the ME installs that new track. >>>> >>>> >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> >>>> >>>> X >>>> >>>> >>>> >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang >>>> wrote: >>>> >>>>> >>>> >>>>> Hi all, >>>> >>>>> >>>> >>>>> During today's call, we presented three control flows between >>>> >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, >>>> and Report >>>> >>>>> Flow, and started to talk about the 4th control flow. The thread >>>> will >>>> >>>>> continue the discussion about 4th flow. >>>> >>>>> >>>> >>>>> Here is the scenario: when a node finds that more cells are >>>> needed, >>>> >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should >>>> be able to >>>> >>>>> ask ME to install more bandwidth. >>>> >>>>> >>>> >>>>> I can see two approaches: >>>> >>>>> (1) Managed by ME, without 4th Control Flow. Assume >>>> BandwidthUsageRate >>>> >>>>> is a attribute in 6top. Then, ME can get the information via >>>> Query Flow or >>>> >>>>> Report Flow, and adjust the bandwidth of the node via Action Flo= w. >>>> >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>> >>>>> Request to ME, and then ME install more bandwidth. This is the >>>> 4th control >>>> >>>>> flow. >>>> >>>>> >>>> >>>>> What do you think? Which one makes more sense? >>>> >>>>> >>>> >>>>> Qin >>>> >>>>> >>>> >>>>> >>>> >>>>> >>>> >>>>> _______________________________________________ >>>> >>>>> 6tsch mailing list >>>> >>>>> 6tsch@ietf.org >>>> >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>>>> >>>> >>>> >>>> >>> >>>> >>> >>>> >>> _______________________________________________ >>>> >>> 6tsch mailing list >>>> >>> 6tsch@ietf.org >>>> >>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>> >>>> >> >>>> >> >>>> >> >>>> >> -- >>>> >> Thomas Watteyne, Ph. D >>>> >> Sr. Networking Design Engineer >>>> >> Dust Networks / Linear Technology >>>> >> 30695 Huntwood Ave >>>> >> Hayward, CA 94544-7021 >>>> >> +1 (510) 400-2978 >>>> >> twatteyne@linear.com >>>> >> >>>> >> This e-mail transmission, and any documents, files or previous e-ma= il >>>> >> messages attached to it may contain confidential information that i= s >>>> legally >>>> >> privileged. If you are not the intended recipient, or a person >>>> responsible >>>> >> for delivering it to the intended recipient, you are hereby notifie= d >>>> that >>>> >> any disclosure, copying, distribution or use of any of the >>>> information >>>> >> contained in or attached to this transmission is STRICTLY >>>> PROHIBITED. If you >>>> >> have received this transmission in error, please immediately notify >>>> me by >>>> >> reply e-mail, or by telephone at (510) 400-2978, and destroy the >>>> original >>>> >> transmission and its attachments without reading or saving in any >>>> manner. >>>> >> Thank you. >>>> > >>>> > >>>> > >>>> > _______________________________________________ >>>> > 6tsch mailing list >>>> > 6tsch@ietf.org >>>> > https://www.ietf.org/mailman/listinfo/6tsch >>>> > >>>> >>>> >>>> >>>> -- >>>> DIEGO DUJOVNE >>>> Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicacio= nes >>>> Facultad de Ingenier=EDa UDP >>>> www.ingenieria.udp.cl >>>> (56 2) 676 8125 >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >>> >> > --089e0122ad0630622504e5081e2b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Thomas,

    I agree to the 4 control flows.= One more question for the two node->ME flows: Is a Confirmation from ME= to node needed?

    Thanks
    Qin


    On Thu, Aug 2= 9, 2013 at 2:15 AM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wrote:
    All,

    If = possible, let's keep things simple and stick closely to the charter, ce= rtainly for now.

    I would like to propose the following assumptions:
    • let's assume signaling and data packets are independent.
      IMO= , signaling packets are either short and infrequent (events, commands), or = periodic and large (statistics). Once we have run a number of networks, and= can quantify the trade-offs, we can consider piggybacking.
    • let's consider the steps highlighted in the charter, for now:
      • <= ul>
    • draft-vilajosana-6tsch-basic gives us a network with minimal connect= ivity between all nodes in the network. Most of the schedule is empty, avai= lable ot some dynamic scheduler.
    • the scheduler uses the minimal connectivity to communicate, either betw= een neighbors (distributed), or between nodes and the PCE (centralized)
    If we agree with this, I propose we go back to discussing t= he types of flows, per the name of this thread. I'd like to call on a r= ough consensus for the following 4 flows:
    • ME->node
      • action
      • query
      • node->ME
        • report
        • event
      Thomas



    On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    Thomas,

    I agree to keep different alter= natives, at lease as options.

    Regarding to what ki= nds of cells should be used for conveying the report, shared cells or dedic= ated cells, I would like to leave them to configuration. What do you think?=

    Thanks
    Qin


    On Wed, Aug 28, 2013 at 6:39 AM, Thomas Wa= tteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    You= bring up a good point: over what cells with the reports travel? Another qu= estions could be: over what cells will the request to install cells travel?= I believe that, whatever the policy in place in the network, there will al= ways need to be some cells installed for infrequent signaling traffic. If t= he report rate is very slow, it might qualify as "infrequent signaling= traffic". For sure, the request to change the schedule qualifies.

    Isn't the answer=A0draft-vilajosana-6tsch-basic? Th= at is, the slotted Aloha schedule indicated in the draft can be used for th= e signaling traffic between the nodes and the ME. Of course, if the report = rate is very high, some dedicate track might be installed, but I do not bel= ieve this is needed, certainly not this early on.

    I agree with Diego that keeping the solution open to di= fferent alternative is key.

    Thomas


    On Tue, = Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne <diego.dujovne@mail.= udp.cl> wrote:
    Qin, Thomas,
    =A0 =A0 =A0 Alternative (1) adds delay to define the slots to send the even= t
    to the ME (propagate the new schedule),
    while alternative (2) =A0keeps reserved slots waiting for the event to happ= en.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:
    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driv= en report
    > is. I think we don't want to assume 6top sublayer is very intellig= ent, in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is =A0when and how the bandwidt= h for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control fl= ows between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destro= y the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch




    --089e0122ad0630622504e5081e2b-- From xvilajosana@berkeley.edu Wed Aug 28 15:26:40 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 55C4121E8054 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 15:26:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.697 X-Spam-Level: X-Spam-Status: No, score=-2.697 tagged_above=-999 required=5 tests=[AWL=0.279, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MANqk-gOg2mI for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 15:26:35 -0700 (PDT) Received: from mail-pa0-f48.google.com (mail-pa0-f48.google.com [209.85.220.48]) by ietfa.amsl.com (Postfix) with ESMTP id C0D4F11E81A3 for <6tsch@ietf.org>; Wed, 28 Aug 2013 15:26:35 -0700 (PDT) Received: by mail-pa0-f48.google.com with SMTP id kp13so45527pab.35 for <6tsch@ietf.org>; Wed, 28 Aug 2013 15:26:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=i6XGevmtrwnqk7uU9Ocd3kjdcTAPkmREm3XN0qLJKY4=; b=m/Z3uFlk+Bu9vRQwxIcC9NV9LE+YjYQ+fPOC+Qua1ma/8lWfvhBPQg+iUJ+Wc6zMex a+lcKrg2toUCZ8j3ppi2FmcgScP171/+RyC085Lte5Hzv/Nqp9id1irRCG3IFlLScVXw zG5Z2J1AQnbynbVKIEJPbe3J2YUNhgFR+9hMdN4B5bI9Lk00O7Gw5sLcBP/tc8cjLKyh bAEn0DnGzS/m2wieLjBO5gYlLQQdTuZ4TKqzLHO1aUe8AmdtIdnz3wcLkcukfUwYNoaC nwHeLotsAP8wK/dUIC6ncnWNOsYLtuRuX+0NmUca51kQO71nXHjdmqFJPLkbg/J/GQZz aLwA== X-Gm-Message-State: ALoCoQl0XtYZp9eM4G4RjnrOcUlTIEBBttC89RpybW2AYIj4nECEPG0IEpuVpx9Zl+/fo9cvkodr MIME-Version: 1.0 X-Received: by 10.66.227.2 with SMTP id rw2mr801130pac.131.1377728795271; Wed, 28 Aug 2013 15:26:35 -0700 (PDT) Received: by 10.70.34.44 with HTTP; Wed, 28 Aug 2013 15:26:35 -0700 (PDT) In-Reply-To: References: Date: Wed, 28 Aug 2013 15:26:35 -0700 Message-ID: From: Xavier Vilajosana Guillen To: Qin Wang Content-Type: multipart/alternative; boundary=047d7b11202170791d04e5097b9e Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: xvilajosana@eecs.berkeley.edu List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Aug 2013 22:26:40 -0000 --047d7b11202170791d04e5097b9e Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi, I also agree with the 4 message flows. as regards to Confirmation, this would introduce end-to-end confirmation at L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an optional feature? X On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang wrote: > Thomas, > > I agree to the 4 control flows. One more question for the two node->ME > flows: Is a Confirmation from ME to node needed? > > Thanks > Qin > > > On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote: > >> All, >> >> If possible, let's keep things simple and stick closely to the charter, >> certainly for now. >> >> I would like to propose the following assumptions: >> >> - let's assume signaling and data packets are independent. >> IMO, signaling packets are either short and infrequent (events, >> commands), or periodic and large (statistics). Once we have run a num= ber of >> networks, and can quantify the trade-offs, we can consider piggybacki= ng. >> - let's consider the steps highlighted in the charter, for now: >> - draft-vilajosana-6tsch-basic gives us a network with minimal >> connectivity between all nodes in the network. Most of the schedul= e is >> empty, available ot some dynamic scheduler. >> - the scheduler uses the minimal connectivity to communicate, >> either between neighbors (distributed), or between nodes and the P= CE >> (centralized) >> >> If we agree with this, I propose we go back to discussing the types of >> flows, per the name of this thread. I'd like to call on a rough consensu= s >> for the following 4 flows: >> >> - ME->node >> - action >> - query >> - node->ME >> - report >> - event >> >> Thomas >> >> >> >> On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang wrote: >> >>> Thomas, >>> >>> I agree to keep different alternatives, at lease as options. >>> >>> Regarding to what kinds of cells should be used for conveying the >>> report, shared cells or dedicated cells, I would like to leave them to >>> configuration. What do you think? >>> >>> Thanks >>> Qin >>> >>> >>> >>> On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne < >>> watteyne@eecs.berkeley.edu> wrote: >>> >>>> Qin, >>>> >>>> You bring up a good point: over what cells with the reports travel? >>>> Another questions could be: over what cells will the request to instal= l >>>> cells travel? I believe that, whatever the policy in place in the netw= ork, >>>> there will always need to be some cells installed for infrequent signa= ling >>>> traffic. If the report rate is very slow, it might qualify as "infrequ= ent >>>> signaling traffic". For sure, the request to change the schedule quali= fies. >>>> >>>> Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted >>>> Aloha schedule indicated in the draft can be used for the signaling tr= affic >>>> between the nodes and the ME. Of course, if the report rate is very hi= gh, >>>> some dedicate track might be installed, but I do not believe this is >>>> needed, certainly not this early on. >>>> >>>> I agree with Diego that keeping the solution open to different >>>> alternative is key. >>>> >>>> Thomas >>>> >>>> >>>> On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne < >>>> diego.dujovne@mail.udp.cl> wrote: >>>> >>>>> Qin, Thomas, >>>>> Alternative (1) adds delay to define the slots to send the even= t >>>>> to the ME (propagate the new schedule), >>>>> while alternative (2) keeps reserved slots waiting for the event to >>>>> happen. >>>>> I think both alternatives should be included, and configured by the M= E >>>>> depending >>>>> on the network requirements. >>>>> >>>>> More thoughts? >>>>> >>>>> Diego Dujovne >>>>> >>>>> 2013/8/27 Qin Wang : >>>>> > Thomas, >>>>> > >>>>> > I agree with almost all. Only some comments on "Report Flow". >>>>> > >>>>> > As you mentioned, there are two kinds of report scenarios, one is >>>>> > periodically report, another one is burst report or called as >>>>> event-driven >>>>> > report. I have no question on how periodically report works, which >>>>> you >>>>> > described. But I'm not sure what the best way to handle event-drive= n >>>>> report >>>>> > is. I think we don't want to assume 6top sublayer is very >>>>> intelligent, in >>>>> > another word, the events and the trigger of events should be >>>>> configured by >>>>> > ME, just like the interval of periodically report. Make sense? >>>>> > >>>>> > If you agree to it, the remained issue is when and how the >>>>> bandwidth for >>>>> > sending event-driven reports is reserved. Here are two ways I can >>>>> see. >>>>> > (1) when a event is triggered, node sends a request to ME and ask >>>>> some BW to >>>>> > send the report. I believe that is how the 4th control flow works. >>>>> > (2) when ME configure the events and their triggers, ME also >>>>> provisions some >>>>> > BW for the node which allows the node to send the report triggered >>>>> by some >>>>> > event. >>>>> > >>>>> > I have no strong opinion on which one is better. But, the bottom >>>>> line is the >>>>> > configuration of the set of events and their triggers should be out >>>>> of 6top >>>>> > scope. Thought? >>>>> > >>>>> > Thanks >>>>> > Qin >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne < >>>>> twatteyne@linear.com> >>>>> > wrote: >>>>> >> >>>>> >> Qin, >>>>> >> >>>>> >> Please correct me if I'm wrong: >>>>> >> - Action Flow (ME->6top). ME asks 6top to execute some command. >>>>> Typical >>>>> >> commands are add/delete cells. >>>>> >> - Query Flow (ME->6top). ME asks 6top for some information. Typica= l >>>>> >> queries are about current cells usage or statistics. >>>>> >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical >>>>> reported >>>>> >> information covers cells usage or statistics. >>>>> >> >>>>> >> Questions: >>>>> >> - Looks like Query and Report flows contain the same information. = In >>>>> >> normal operation, the Report flow should be enough, the Query flow >>>>> only >>>>> >> being used in special cases, for example when the ME has lost stat= e >>>>> (just >>>>> >> booted, bug, etc). Agreed? >>>>> >> - The ME should be able to configure the report flow. Configuratio= n >>>>> could >>>>> >> be "send report every X seconds" or "send report when variable X >>>>> larger than >>>>> >> Y". I imagine this could be done over the action flow? Agreed? >>>>> >> - A node will want to report an urgent event to the ME. One such >>>>> events is >>>>> >> "the topology appears to have changed". There any many cases where >>>>> this >>>>> >> information needs to be sent immediately, i.e. no time to wait for >>>>> the next >>>>> >> report cycle. We can consider this to be an asynchronous report, o= r >>>>> part of >>>>> >> a new "Event" flow. >>>>> >> - Same for the mote asking the ME for a schedule update. >>>>> >> >>>>> >> Thoughts? >>>>> >> >>>>> >> Thomas >>>>> >> >>>>> >> >>>>> >> >>>>> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang >>>>> wrote: >>>>> >>> >>>>> >>> Xavi, >>>>> >>> >>>>> >>> Approach-(2) is more flexible and likely covers more situations. >>>>> But, it >>>>> >>> may bring some complexity to 6top, because 6top has to make >>>>> decision on the >>>>> >>> bandwidth request (add/delete), which needs some metrics, some >>>>> intelligence. >>>>> >>> >>>>> >>> What do you think? >>>>> >>> >>>>> >>> Qin >>>>> >>> >>>>> >>> >>>>> >>> >>>>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>>>> >>> wrote: >>>>> >>>> >>>>> >>>> Hi Qin, I like your (2). >>>>> >>>> >>>>> >>>> Note also that there are situations that might have some >>>>> differences. >>>>> >>>> >>>>> >>>> 1-the track already exists. >>>>> >>>> 2-the track between the two entities does not exists >>>>> >>>> >>>>> >>>> in either case I think that the node that requires certain BW to >>>>> another >>>>> >>>> node should talk to 6top, which processes that request and sends >>>>> a request >>>>> >>>> to the ME, the ME installs that new track. >>>>> >>>> >>>>> >>>> does it make sense. Do you see any drawback on that approach? >>>>> >>>> >>>>> >>>> X >>>>> >>>> >>>>> >>>> >>>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang >>>>> wrote: >>>>> >>>>> >>>>> >>>>> Hi all, >>>>> >>>>> >>>>> >>>>> During today's call, we presented three control flows between >>>>> >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, >>>>> and Report >>>>> >>>>> Flow, and started to talk about the 4th control flow. The threa= d >>>>> will >>>>> >>>>> continue the discussion about 4th flow. >>>>> >>>>> >>>>> >>>>> Here is the scenario: when a node finds that more cells are >>>>> needed, >>>>> >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should >>>>> be able to >>>>> >>>>> ask ME to install more bandwidth. >>>>> >>>>> >>>>> >>>>> I can see two approaches: >>>>> >>>>> (1) Managed by ME, without 4th Control Flow. Assume >>>>> BandwidthUsageRate >>>>> >>>>> is a attribute in 6top. Then, ME can get the information via >>>>> Query Flow or >>>>> >>>>> Report Flow, and adjust the bandwidth of the node via Action >>>>> Flow. >>>>> >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidt= h >>>>> >>>>> Request to ME, and then ME install more bandwidth. This is the >>>>> 4th control >>>>> >>>>> flow. >>>>> >>>>> >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> >>>>> 6tsch mailing list >>>>> >>>>> 6tsch@ietf.org >>>>> >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>>> >>>>> >>>> >>>>> >>> >>>>> >>> >>>>> >>> _______________________________________________ >>>>> >>> 6tsch mailing list >>>>> >>> 6tsch@ietf.org >>>>> >>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>> >>>>> >> >>>>> >> >>>>> >> >>>>> >> -- >>>>> >> Thomas Watteyne, Ph. D >>>>> >> Sr. Networking Design Engineer >>>>> >> Dust Networks / Linear Technology >>>>> >> 30695 Huntwood Ave >>>>> >> Hayward, CA 94544-7021 >>>>> >> +1 (510) 400-2978 >>>>> >> twatteyne@linear.com >>>>> >> >>>>> >> This e-mail transmission, and any documents, files or previous >>>>> e-mail >>>>> >> messages attached to it may contain confidential information that >>>>> is legally >>>>> >> privileged. If you are not the intended recipient, or a person >>>>> responsible >>>>> >> for delivering it to the intended recipient, you are hereby >>>>> notified that >>>>> >> any disclosure, copying, distribution or use of any of the >>>>> information >>>>> >> contained in or attached to this transmission is STRICTLY >>>>> PROHIBITED. If you >>>>> >> have received this transmission in error, please immediately notif= y >>>>> me by >>>>> >> reply e-mail, or by telephone at (510) 400-2978, and destroy the >>>>> original >>>>> >> transmission and its attachments without reading or saving in any >>>>> manner. >>>>> >> Thank you. >>>>> > >>>>> > >>>>> > >>>>> > _______________________________________________ >>>>> > 6tsch mailing list >>>>> > 6tsch@ietf.org >>>>> > https://www.ietf.org/mailman/listinfo/6tsch >>>>> > >>>>> >>>>> >>>>> >>>>> -- >>>>> DIEGO DUJOVNE >>>>> Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaci= ones >>>>> Facultad de Ingenier=EDa UDP >>>>> www.ingenieria.udp.cl >>>>> (56 2) 676 8125 >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>>> >>>> _______________________________________________ >>>> 6tsch mailing list >>>> 6tsch@ietf.org >>>> https://www.ietf.org/mailman/listinfo/6tsch >>>> >>>> >>> >> > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > > --047d7b11202170791d04e5097b9e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi, I also agree with the 4 message flows.
    as regards t= o Confirmation, this would introduce end-to-end confirmation at L2.5 - 3. I= don't think we need that as a mandatory concept. Maybe an optional fea= ture?


    X
     --047d7b11202170791d04e5097b9e-- From jvasseur@cisco.com Wed Aug 28 22:24:53 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 789EB21F9EE5 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 22:24:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.598 X-Spam-Level: X-Spam-Status: No, score=-10.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CkJ8rk0WxvL6 for <6tsch@ietfa.amsl.com>; Wed, 28 Aug 2013 22:24:48 -0700 (PDT) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id 13FAC21F9EE0 for <6tsch@ietf.org>; Wed, 28 Aug 2013 22:24:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=35420; q=dns/txt; s=iport; t=1377753888; x=1378963488; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=14VGgodBM9Gz/w0L8AbX4ZC4wPs48K7zR72oLBLejGg=; b=Cp9KC2YGLhZYAfhdeSO//H4Hjnua67WzGowXt99Z3qioKDXL35cZ84iP 18PuBrG6nQBrmKW1drTkgAEdnwbCSQv3qIzAgoQ9C/mgSuPaCEdu+SNK9 AdJnpqdH+6HLd6+6u0zyKa921y4nddplJFf8jfaPAdB8Tmmp30eeLSHq0 g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AicFALvaHlKtJV2b/2dsb2JhbABXAw6CNUQ1UbdpiD2BJhZ0giQBAQEDAQEBARcNIiULBQsCAQgRBAEBAQoWAQYHJwsUCQgCBAoEBQgTh2AGDLkAjiMRgQghCwEBAwYBBgMIgwt9A4VKgzKQJJA3gmE/gXE5 X-IronPort-AV: E=Sophos;i="4.89,981,1367971200"; d="scan'208,217";a="252781277" Received: from rcdn-core-4.cisco.com ([173.37.93.155]) by rcdn-iport-1.cisco.com with ESMTP; 29 Aug 2013 05:24:40 +0000 Received: from xhc-aln-x01.cisco.com (xhc-aln-x01.cisco.com [173.36.12.75]) by rcdn-core-4.cisco.com (8.14.5/8.14.5) with ESMTP id r7T5Oe8E021961 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 29 Aug 2013 05:24:40 GMT Received: from xmb-rcd-x02.cisco.com ([169.254.4.198]) by xhc-aln-x01.cisco.com ([173.36.12.75]) with mapi id 14.02.0318.004; Thu, 29 Aug 2013 00:24:40 -0500 From: "JP Vasseur (jvasseur)" To: "" Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOpHgPsO35fkKEM0WUtUASdrL2uA== Date: Thu, 29 Aug 2013 05:24:40 +0000 Message-ID: <03B78081B371D44390ED6E7BADBB4A772372BEF9@xmb-rcd-x02.cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.60.114.230] Content-Type: multipart/alternative; boundary="_000_03B78081B371D44390ED6E7BADBB4A772372BEF9xmbrcdx02ciscoc_" MIME-Version: 1.0 Cc: Maria Rita PALATTELLA , Thomas Watteyne , "Pascal Thubert \(pthubert\)" , "6tsch@ietf.org" <6tsch@ietf.org>, Qin Wang Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 05:24:53 -0000 --_000_03B78081B371D44390ED6E7BADBB4A772372BEF9xmbrcdx02ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I would just be vary cautious when thinking of piggybacking control informa= tion in packet header for control plane purpose as opposed to specifying a = "clean" (if I may use that expression) approach though. Thanks. JP. On Aug 28, 2013, at 7:49 PM, Xavier Vilajosana Guillen > wrote: Hi, while it sounds to me a great idea, I think it is better first to concentra= te on the basic things. IMHO, we need first to define the signals to contro= l the flow of data, later if we can define little headers where we can add = this control bits together with data packets would be a good enhancement. What do you think? X On Wed, Aug 28, 2013 at 7:51 AM, Qin Wang > wrote: Hi Pascal, I think your "a few control bits piggy-backed with the existing traffic" is= a good idea. Over-provision can increase the throughput at peak time, whil= e the control bits can reduce the energy consumption for idle-listening (at= least at the beginning of slot) in those unused Tx/Rx cells. Xavi and Thomas, I think the method can be used to save energy in our over-= provision case, event that is for improving link quality. What do you think= ? Thanks Qin On Wed, Aug 28, 2013 at 8:05 PM, Pascal Thubert (pthubert) > wrote: Hello Maria Rita: There are also schemas that could allow to dynamically adapt the amount of = cells in a bundle between 2 peer routers with a few control bits piggy-back= ed with the existing traffic. Such schema would avoid the need for out-of-band control traffic and avoid = the problem of pre allocating slots for that purpose. In the simplest case, we would allocate a peak n number of time slots for a= bundle but signal with a control bit whether the next slot is actually fre= e in which case both sender and receiver would sleep at that time. By defau= lt the devices would send/receive every p [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Maria Rita PAL= ATTELLA Sent: mercredi 28 ao=FBt 2013 11:38 To: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] the 4th control flow Thomas, I believe that after defining the message format for each flow, we= will have to address the issue you have just raised up, i.e., the cells to= be used for any kind of signaling traffic (i.e., add/delete cells, report = traffic, etc.). Even though we may start using the slotted aloha schedule approach, in the = future, we may think about dedicated tracks, to be built according to the r= equirements of the schedule used for transferring the actual data traffic. What do you think? Maria Rita From: 6tsch-bounces@ietf.org [mailto:6tsch-b= ounces@ietf.org] On Behalf Of Thomas Watteyne Sent: Wednesday, August 28, 2013 12:40 AM To: 6tsch@ietf.org Subject: Re: [6tsch] the 4th control flow Qin, You bring up a good point: over what cells with the reports travel? Another= questions could be: over what cells will the request to install cells trav= el? I believe that, whatever the policy in place in the network, there will= always need to be some cells installed for infrequent signaling traffic. I= f the report rate is very slow, it might qualify as "infrequent signaling t= raffic". For sure, the request to change the schedule qualifies. Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha s= chedule indicated in the draft can be used for the signaling traffic betwee= n the nodes and the ME. Of course, if the report rate is very high, some de= dicate track might be installed, but I do not believe this is needed, certa= inly not this early on. I agree with Diego that keeping the solution open to different alternative = is key. Thomas On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne > wrote: Qin, Thomas, Alternative (1) adds delay to define the slots to send the event to the ME (propagate the new schedule), while alternative (2) keeps reserved slots waiting for the event to happen= . I think both alternatives should be included, and configured by the ME depe= nding on the network requirements. More thoughts? Diego Dujovne 2013/8/27 Qin Wang >: > Thomas, > > I agree with almost all. Only some comments on "Report Flow". > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-drive= n > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven repo= rt > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured b= y > ME, just like the interval of periodically report. Make sense? > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see. > (1) when a event is triggered, node sends a request to ME and ask some BW= to > send the report. I believe that is how the 4th control flow works. > (2) when ME configure the events and their triggers, ME also provisions s= ome > BW for the node which allows the node to send the report triggered by som= e > event. > > I have no strong opinion on which one is better. But, the bottom line is = the > configuration of the set of events and their triggers should be out of 6t= op > scope. Thought? > > Thanks > Qin > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: >> >> Qin, >> >> Please correct me if I'm wrong: >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typical >> commands are add/delete cells. >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> queries are about current cells usage or statistics. >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported >> information covers cells usage or statistics. >> >> Questions: >> - Looks like Query and Report flows contain the same information. In >> normal operation, the Report flow should be enough, the Query flow only >> being used in special cases, for example when the ME has lost state (jus= t >> booted, bug, etc). Agreed? >> - The ME should be able to configure the report flow. Configuration coul= d >> be "send report every X seconds" or "send report when variable X larger = than >> Y". I imagine this could be done over the action flow? Agreed? >> - A node will want to report an urgent event to the ME. One such events = is >> "the topology appears to have changed". There any many cases where this >> information needs to be sent immediately, i.e. no time to wait for the n= ext >> report cycle. We can consider this to be an asynchronous report, or part= of >> a new "Event" flow. >> - Same for the mote asking the ME for a schedule update. >> >> Thoughts? >> >> Thomas >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: >>> >>> Xavi, >>> >>> Approach-(2) is more flexible and likely covers more situations. But, i= t >>> may bring some complexity to 6top, because 6top has to make decision on= the >>> bandwidth request (add/delete), which needs some metrics, some intellig= ence. >>> >>> What do you think? >>> >>> Qin >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> > w= rote: >>>> >>>> Hi Qin, I like your (2). >>>> >>>> Note also that there are situations that might have some differences. >>>> >>>> 1-the track already exists. >>>> 2-the track between the two entities does not exists >>>> >>>> in either case I think that the node that requires certain BW to anoth= er >>>> node should talk to 6top, which processes that request and sends a req= uest >>>> to the ME, the ME installs that new track. >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> X >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: >>>>> >>>>> Hi all, >>>>> >>>>> During today's call, we presented three control flows between >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Re= port >>>>> Flow, and started to talk about the 4th control flow. The thread will >>>>> continue the discussion about 4th flow. >>>>> >>>>> Here is the scenario: when a node finds that more cells are needed, >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be ab= le to >>>>> ask ME to install more bandwidth. >>>>> >>>>> I can see two approaches: >>>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRat= e >>>>> is a attribute in 6top. Then, ME can get the information via Query Fl= ow or >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>>> Request to ME, and then ME install more bandwidth. This is the 4th co= ntrol >>>>> flow. >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> >> -- >> Thomas Watteyne, Ph. D >> Sr. Networking Design Engineer >> Dust Networks / Linear Technology >> 30695 Huntwood Ave >> Hayward, CA 94544-7021 >> +1 (510) 400-2978 >> twatteyne@linear.com >> >> This e-mail transmission, and any documents, files or previous e-mail >> messages attached to it may contain confidential information that is leg= ally >> privileged. If you are not the intended recipient, or a person responsib= le >> for delivering it to the intended recipient, you are hereby notified tha= t >> any disclosure, copying, distribution or use of any of the information >> contained in or attached to this transmission is STRICTLY PROHIBITED. If= you >> have received this transmission in error, please immediately notify me b= y >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original >> transmission and its attachments without reading or saving in any manner= . >> Thank you. > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_03B78081B371D44390ED6E7BADBB4A772372BEF9xmbrcdx02ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable Hi,

    I would just be vary cautious when thinking of piggybacking control in= formation in packet header for control plane purpose as opposed to specifyi= ng a "clean" 
    (if I may use that expression) approach though. 

    Thanks.

    JP.

    On Aug 28, 2013, at 7:49 PM, Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>= wrote:

    Hi,

    while it sounds to me a great idea, I think it is better first to concentra= te on the basic things. IMHO, we need first to define the signals to contro= l the flow of data, later if we can define little headers where we can add = this control bits together with data packets would be a good enhancement.

    What do you think?
    X


    On Wed, Aug 28, 2013 at 7:51 AM, Qin Wang <qinwang@berke= ley.edu> wrote:
    Hi Pascal,

    I think your "a few control bits piggy-backed with the ex= isting traffic" is a good idea. Over-provision can increase the= throughput at peak time, while the control bits can reduce the energy consumption for idle-listening (at least at the= beginning of slot) in those unused Tx/Rx cells.

    Xavi and Thomas, I think the method can be used to save energy in our = over-provision case, event that is for improving link quality. What do you = think?

    Thanks
    Qin


    On Wed, Aug 28, 2013 at 8:05 PM, Pascal Thubert = (pthubert) <pthubert@cisco.com> wrote:

    Hello Maria Rita:=

     

    There are also schemas th= at could allow to dynamically adapt the amount of cells in a bundle between= 2 peer routers with a few control bits piggy-backed with the existing traffic.

    Such schema would avoid t= he need for out-of-band control traffic and avoid the problem of pre alloca= ting slots for that purpose.

     

    In the simplest case, we = would allocate a peak n number of time slots for a bundle but signal with a= control bit whether the next slot is actually free in which case both sender and receiver would sleep at that time. By default the dev= ices would send/receive every p <n but if a burst of traffic or addition= al retries require so, the co-next slot would be activated.

     

    For instance with p =3D 1= and n =3D 4 we can quadruple the throughput at peak time.

     

    What do you think?=

     

    Pascal=

     

    From: 6tsch-bounces@i= etf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Maria Rita PALATTELLA
    Sent: mercredi 28 ao=FBt 2013 11:38
    To: Thomas Watteyne; 6tsch@ietf.org


    Subject: Re: [6tsch] the 4th control flow

     

    Thomas, I believe that af= ter defining the message format for each flow,  we will have to addres= s the issue you have just raised up, i.e., the cells to be used for any kind of signaling traffic (i.e., add/delete cells, report traffic,= etc.).

    Even though we may start = using the slotted aloha schedule approach, in the future, we may think abou= t dedicated tracks, to be built according to the requirements of the schedule used for transferring the actual data traffic.

    What do you think?

    Maria Rita

     

    From: 6tsch-bounces@i= etf.org [ma= ilto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: Wednesday, August 28, 2013 12:40 AM
    To: 6tsch@ietf.o= rg
    Subject: Re: [6tsch] the 4th control flow

     

    Qin,

     

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in = the network, there will always need to be some cells installed for infrequent signaling traffic. If the report= rate is very slow, it might qualify as "infrequent signaling traffic&= quot;. For sure, the request to change the schedule qualifies.

     

    Isn't the answer draft-vilajosana-6tsch-basic? = That is, the slotted Aloha schedule indicated in the draft can be used for = the signaling traffic between the nodes and the ME. Of course, if the repor= t rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not thi= s early on.

     

    I agree with Diego that keeping the solution open to= different alternative is key.

     

    Thomas

     <= /p>

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
          Alternative (1) adds delay to define the slots to send= the event
    to the ME (propagate the new schedule),
    while alternative (2)  keeps reserved slots waiting for the event to h= appen.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driven r= eport
    > is. I think we don't want to assume 6top sublayer is very intelligent,= in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is  when and how the bandw= idth for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control flows = between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> += ;1 (510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.= udp.cl
    (56 2) 676 8125=

    _______________________________________________
    6tsch mailing list
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    --_000_03B78081B371D44390ED6E7BADBB4A772372BEF9xmbrcdx02ciscoc_-- From maria-rita.palattella@uni.lu Thu Aug 29 02:00:47 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 61E0021F9BB5 for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 02:00:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.523 X-Spam-Level: X-Spam-Status: No, score=-6.523 tagged_above=-999 required=5 tests=[AWL=0.075, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RSyHMOiYC-uI for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 02:00:43 -0700 (PDT) Received: from hercules.uni.lu (hercules.uni.lu [158.64.76.33]) by ietfa.amsl.com (Postfix) with ESMTP id BC84321F9B52 for <6tsch@ietf.org>; Thu, 29 Aug 2013 02:00:36 -0700 (PDT) X-IronPort-AV: E=Sophos;i="4.89,981,1367964000"; d="xml'?rels'?docx'72,48?scan'72,48,208,217,72,48";a="26153885" Received: from unknown (HELO REED.uni.lux) ([10.21.2.9]) by hercules.uni.lu with ESMTP; 29 Aug 2013 11:00:35 +0200 Received: from HOSHI.uni.lux ([fe80::499:a33:4e68:4af9]) by REED.uni.lux ([fe80::31bb:b7a3:7abb:813e%10]) with mapi id 14.03.0158.001; Thu, 29 Aug 2013 11:00:34 +0200 From: Maria Rita PALATTELLA To: "xvilajosana@eecs.berkeley.edu" , Qin Wang Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOo2nA37SuPY1UNUSxyNbir/bk6pmpcIqAgAATvoCAARHRgIAANpuAgAAq9oCAABtKgIAA0eWg Date: Thu, 29 Aug 2013 09:00:34 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.24.1.97] Content-Type: multipart/mixed; boundary="_004_F085911F642A6847987ADA23E611780D1858E736hoshiunilux_" MIME-Version: 1.0 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 09:00:47 -0000 --_004_F085911F642A6847987ADA23E611780D1858E736hoshiunilux_ Content-Type: multipart/alternative; boundary="_000_F085911F642A6847987ADA23E611780D1858E736hoshiunilux_" --_000_F085911F642A6847987ADA23E611780D1858E736hoshiunilux_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable All, going back to the definition of the 4 control flows, I tried to fill s= ome of the TODO rows of the tables that Qin created so far. An updated version of these tables is attached. I left also some comments f= or discussing on. Any comment is welcome. Maria Rita From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of X= avier Vilajosana Guillen Sent: Thursday, August 29, 2013 12:27 AM To: Qin Wang Cc: Thomas Watteyne; 6tsch@ietf.org Subject: Re: [6tsch] the 4th control flow Hi, I also agree with the 4 message flows. as regards to Confirmation, this would introduce end-to-end confirmation at= L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an opti= onal feature? X On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang > wrote: Thomas, I agree to the 4 control flows. One more question for the two node->ME flow= s: Is a Confirmation from ME to node needed? Thanks Qin On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne > wrote: All, If possible, let's keep things simple and stick closely to the charter, cer= tainly for now. I would like to propose the following assumptions: * let's assume signaling and data packets are independent. IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking. * let's consider the steps highlighted in the charter, for now: * draft-vilajosana-6tsch-basic gives us a network with minimal conne= ctivity between all nodes in the network. Most of the schedule is empty, av= ailable ot some dynamic scheduler. * the scheduler uses the minimal connectivity to communicate, either= between neighbors (distributed), or between nodes and the PCE (centralized= ) If we agree with this, I propose we go back to discussing the types of flow= s, per the name of this thread. I'd like to call on a rough consensus for t= he following 4 flows: * ME->node * action * query * node->ME * report * event Thomas On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang > wrote: Thomas, I agree to keep different alternatives, at lease as options. Regarding to what kinds of cells should be used for conveying the report, s= hared cells or dedicated cells, I would like to leave them to configuration= . What do you think? Thanks Qin On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne > wrote: Qin, You bring up a good point: over what cells with the reports travel? Another= questions could be: over what cells will the request to install cells trav= el? I believe that, whatever the policy in place in the network, there will= always need to be some cells installed for infrequent signaling traffic. I= f the report rate is very slow, it might qualify as "infrequent signaling t= raffic". For sure, the request to change the schedule qualifies. Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha s= chedule indicated in the draft can be used for the signaling traffic betwee= n the nodes and the ME. Of course, if the report rate is very high, some de= dicate track might be installed, but I do not believe this is needed, certa= inly not this early on. I agree with Diego that keeping the solution open to different alternative = is key. Thomas On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne > wrote: Qin, Thomas, Alternative (1) adds delay to define the slots to send the event to the ME (propagate the new schedule), while alternative (2) keeps reserved slots waiting for the event to happen= . I think both alternatives should be included, and configured by the ME depe= nding on the network requirements. More thoughts? Diego Dujovne 2013/8/27 Qin Wang >: > Thomas, > > I agree with almost all. Only some comments on "Report Flow". > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-drive= n > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven repo= rt > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured b= y > ME, just like the interval of periodically report. Make sense? > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see. > (1) when a event is triggered, node sends a request to ME and ask some BW= to > send the report. I believe that is how the 4th control flow works. > (2) when ME configure the events and their triggers, ME also provisions s= ome > BW for the node which allows the node to send the report triggered by som= e > event. > > I have no strong opinion on which one is better. But, the bottom line is = the > configuration of the set of events and their triggers should be out of 6t= op > scope. Thought? > > Thanks > Qin > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: >> >> Qin, >> >> Please correct me if I'm wrong: >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typical >> commands are add/delete cells. >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> queries are about current cells usage or statistics. >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported >> information covers cells usage or statistics. >> >> Questions: >> - Looks like Query and Report flows contain the same information. In >> normal operation, the Report flow should be enough, the Query flow only >> being used in special cases, for example when the ME has lost state (jus= t >> booted, bug, etc). Agreed? >> - The ME should be able to configure the report flow. Configuration coul= d >> be "send report every X seconds" or "send report when variable X larger = than >> Y". I imagine this could be done over the action flow? Agreed? >> - A node will want to report an urgent event to the ME. One such events = is >> "the topology appears to have changed". There any many cases where this >> information needs to be sent immediately, i.e. no time to wait for the n= ext >> report cycle. We can consider this to be an asynchronous report, or part= of >> a new "Event" flow. >> - Same for the mote asking the ME for a schedule update. >> >> Thoughts? >> >> Thomas >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: >>> >>> Xavi, >>> >>> Approach-(2) is more flexible and likely covers more situations. But, i= t >>> may bring some complexity to 6top, because 6top has to make decision on= the >>> bandwidth request (add/delete), which needs some metrics, some intellig= ence. >>> >>> What do you think? >>> >>> Qin >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> > w= rote: >>>> >>>> Hi Qin, I like your (2). >>>> >>>> Note also that there are situations that might have some differences. >>>> >>>> 1-the track already exists. >>>> 2-the track between the two entities does not exists >>>> >>>> in either case I think that the node that requires certain BW to anoth= er >>>> node should talk to 6top, which processes that request and sends a req= uest >>>> to the ME, the ME installs that new track. >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> X >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: >>>>> >>>>> Hi all, >>>>> >>>>> During today's call, we presented three control flows between >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Re= port >>>>> Flow, and started to talk about the 4th control flow. The thread will >>>>> continue the discussion about 4th flow. >>>>> >>>>> Here is the scenario: when a node finds that more cells are needed, >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be ab= le to >>>>> ask ME to install more bandwidth. >>>>> >>>>> I can see two approaches: >>>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRat= e >>>>> is a attribute in 6top. Then, ME can get the information via Query Fl= ow or >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>>> Request to ME, and then ME install more bandwidth. This is the 4th co= ntrol >>>>> flow. >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> >> -- >> Thomas Watteyne, Ph. D >> Sr. Networking Design Engineer >> Dust Networks / Linear Technology >> 30695 Huntwood Ave >> Hayward, CA 94544-7021 >> +1 (510) 400-2978 >> twatteyne@linear.com >> >> This e-mail transmission, and any documents, files or previous e-mail >> messages attached to it may contain confidential information that is leg= ally >> privileged. If you are not the intended recipient, or a person responsib= le >> for delivering it to the intended recipient, you are hereby notified tha= t >> any disclosure, copying, distribution or use of any of the information >> contained in or attached to this transmission is STRICTLY PROHIBITED. If= you >> have received this transmission in error, please immediately notify me b= y >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original >> transmission and its attachments without reading or saving in any manner= . >> Thank you. > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_F085911F642A6847987ADA23E611780D1858E736hoshiunilux_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    All, going back to the de= finition of the 4 control flows, I tried to fill some of the TODO rows of t= he tables that Qin created so far.

     <= /p>

    An updated version of the= se tables is attached. I left also some comments for discussing on.

    Any comment is welcome.

     <= /p>

    Maria Rita

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Xavier Vilajosana Guillen
    Sent: Thursday, August 29, 2013 12:27 AM
    To: Qin Wang
    Cc: Thomas Watteyne; 6tsch@ietf.org
    Subject: Re: [6tsch] the 4th control flow

     

    Hi, I also agree with the 4 message flows.
    as regards to Confirmation, this would introduce end-to-end confirmation at= L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an opti= onal feature?


    X

     

    On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

     

    I agree to the 4 control flows. One more question fo= r the two node->ME flows: Is a Confirmation from ME to node needed?=

     

    Thanks

    Qin<= /p>

     

    On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    All,

     

    If possible, let's keep things simple and stick clos= ely to the charter, certainly for now.

     

    I would like to propose the following assumptions:

    • let's assume signaling and data packets are independent.
      IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking.
    • let's consider the steps highlighted in the charter, for now:
      • draft-vilajosana-6tsch-basic gives us a network with minimal connectivity b= etween all nodes in the network. Most of the schedule is empty, available o= t some dynamic scheduler.
      • the scheduler uses the minimal connectivity to communicate, either between = neighbors (distributed), or between nodes and the PCE (centralized)

    If we agree with this, I propose we go back to discu= ssing the types of flows, per the name of this thread. I'd like to call on = a rough consensus for the following 4 flows:

    • ME->node
      • action
      • query
    • node->ME
      • report
      • event

    Thomas

     

     

    On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

     

    I agree to keep different alternatives, at lease as = options.

     

    Regarding to what kinds of cells should be used for = conveying the report, shared cells or dedicated cells, I would like to leav= e them to configuration. What do you think?

     

    Thanks

    Qin<= /p>

     

     

    On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    Qin,

     

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in = the network, there will always need to be some cells installed for infrequent signaling traffic. If the report= rate is very slow, it might qualify as "infrequent signaling traffic&= quot;. For sure, the request to change the schedule qualifies.

     

    Isn't the answer draft-vilajosana-6tsch-basic? = That is, the slotted Aloha schedule indicated in the draft can be used for = the signaling traffic between the nodes and the ME. Of course, if the repor= t rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not thi= s early on.

     

    I agree with Diego that keeping the solution open to= different alternative is key.

     

    Thomas

     

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
          Alternative (1) adds delay to define the slots to send= the event
    to the ME (propagate the new schedule),
    while alternative (2)  keeps reserved slots waiting for the event to h= appen.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driven r= eport
    > is. I think we don't want to assume 6top sublayer is very intelligent,= in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is  when and how the bandw= idth for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control flows = between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> += ;1 (510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125=

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

     

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     

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xhc-rcd-x12.cisco.com ([173.37.183.86]) with mapi id 14.02.0318.004; Thu, 29 Aug 2013 04:16:07 -0500 From: "Pascal Thubert (pthubert)" To: "xvilajosana@eecs.berkeley.edu" , Qin Wang , "JP Vasseur (jvasseur)" Thread-Topic: Dynamic slot activation (was part of [6tsch] the 4th control flow) Thread-Index: Ac6kmElEzON3LhrjS3mmBjgO0XvX0w== Date: Thu, 29 Aug 2013 09:16:07 +0000 Deferred-Delivery: Thu, 29 Aug 2013 09:16:00 +0000 Message-ID: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.49.80.28] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD84143010Exmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: Maria Rita PALATTELLA , Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org> Subject: [6tsch] Dynamic slot activation (was part of the 4th control flow) X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 09:16:18 -0000 --_000_E045AECD98228444A58C61C200AE1BD84143010Exmbrcdx01ciscoc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello Xavi and Qin: I'm not sure we want to continue this discussion now or keep it for later,= but either way I'm making it a separate thread to save the current conclus= ions. In short, Thomas below asked: Thomas> over what cells with the reports travel? Another questions could be= : over what cells will the request to install cells travel? This is a good question and at the same time this is not really something t= hat we have to answer right now, per our proposed charter, as Xavi indicate= s: Xavi> I think it is better first to concentrate on the basic things On the side I think the use of the word 'basic' these days could create con= fusion since it seems to refer to draft-vilajosana-6tsch-basic which is pro= bably not Xavi's intention here. I'd suggest that when we refer to the operation in the draft-vilajosana-6ts= ch-basic draft, we call it something like "Basic 6TiSCH" or "Basic 6TiSCH S= upport" so the use of the plain word "basic" may not be confusing anymore. For this particular thread, I suggested as an answer to Thomas that 1) I ag= ree that in the future the control flows could travel over a Basic 6TiSCH i= nstance, and in that case 2) that we could probably handle burstiness of co= ntrol traffic by overprovisioning time slots and then indicating dynamicall= y which extra time slots are being used; as Qin puts it very clearly: Qin> Over-provision can increase the throughput at peak time, while the con= trol bits can reduce the energy consumption for idle-listening (at least at= the beginning of slot) in those unused Tx/Rx cells. I was thinking of something like a 'more' bit in a cell the is being used i= n order to tell listeners to wake up in the next overprovisionned cell, as = opposed to a bit sent at the beginning of the overprovisionned cell that wo= uld indicate that the cell is not being used, though. Xavi agrees that it X= avi> sounds to me a great idea To make sure that we do not make a confusion between 1) the bits that contr= ol the use of overprovisionned cells in a bundle and that are pigy backed w= ith the traffic to indicate there is more trafficoutstanding and 2) the end= to end protocol that controls the allocation of cells between a controllin= g entity and the device, or between devices, JP insisted that the control f= lows for the latter (which are the subject of the original thread by Qin) s= hould be cleanly defined and that we should not expect to piggy back them w= ith traffic: JP> I would just be vary cautious when thinking of piggybacking control inf= ormation in packet header for control plane purpose With this summary, it is up to us to continue the discussion or save it for= later. Should we continue, I suggest we do it in the context of Basic 6TiS= CH to see if that mode could benefit from over-provisioned time slots but t= hen provide a way to use only a subset of those slots. This would probably = make Basic 6TiSCH a lot more useful in the future for applications of vario= us scales and degrees of burstiness. Cheers, Pascal --_000_E045AECD98228444A58C61C200AE1BD84143010Exmbrcdx01ciscoc_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Hello Xavi and Qin:

     <= /p>

    I’m not sure we wan= t  to continue this discussion now or keep it for later, but either wa= y I’m making it a separate thread to save the current conclusions.

     <= /p>

    In short, Thomas below as= ked:

     <= /p>

    Thomas> over what c= ells with the reports travel? Another questions could be: over what cells w= ill the request to install cells travel?

     <= /p>

    This is a good question a= nd at the same time this is not really something that we have to answer rig= ht now, per our proposed charter, as Xavi indicates:

    Xavi> I think it is= better first to concentrate on the basic things

     <= /p>

    On the side I think the u= se of the word ‘basic’ these days could create confusion since = it seems to refer to draft-vilajosana-6tsch-basic which is probably not Xavi’s intention here.

    I’d suggest that wh= en we refer to the operation in the draft-vilajosana-6tsch-basic draft, we = call it something like “Basic 6TiSCH” or “Basic 6TiSCH Su= pport” so the use of the plain word “basic” may not be confusing anym= ore.

     <= /p>

    For this particular threa= d, I suggested as an answer to Thomas that 1) I agree that in the future th= e control flows could travel over a Basic 6TiSCH instance, and in that case 2) that we could probably handle burstiness of control tr= affic by overprovisioning time slots and then indicating dynamically which = extra time slots are being used; as Qin puts it very clearly:

    Qin> Over-provision= can increase the throughput at peak time, while the control bits can reduc= e the energy consumption for idle-listening (at least at the beginning of slot) in those unused Tx/Rx cells.

    I was thinking of somethi= ng like a ‘more’ bit in a cell the is being used in order to te= ll listeners to wake up in the next overprovisionned cell, as opposed to a bit sent at the beginning of the overprovisionned cell that would ind= icate that the cell is not being used, though. Xavi agrees that it Xavi> sounds to me a great idea

     <= /p>

    To make sure that we do n= ot make a confusion between 1) the bits that control the use of overprovisi= onned cells in a bundle and that are pigy backed with the traffic to indicate there is more trafficoutstanding and 2) the end to end= protocol that controls the allocation of cells between a controlling entit= y and the device, or between devices, JP insisted that the control flows fo= r the latter (which are the subject of the original thread by Qin) should be cleanly defined and that we shoul= d not expect to piggy back them with traffic:

    JP> I would just be= vary cautious when thinking of piggybacking control information in packet = header for control plane purpose

     

    With this summary, it is = up to us to continue the discussion or save it for later. Should we continu= e, I suggest we do it in the context of Basic 6TiSCH to see if that mode could be= nefit from over-provisioned time slots but then provide a way to use only a= subset of those slots. This would probably make Basic 6TiSCH a lot more useful in the future for applications of various scales = and degrees of burstiness.

     <= /p>

    Cheers,=

     <= /p>

    Pascal<= /p>

    --_000_E045AECD98228444A58C61C200AE1BD84143010Exmbrcdx01ciscoc_-- From pthubert@cisco.com Thu Aug 29 02:40:13 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E7AFE21F9AE7 for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 02:40:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -10.491 X-Spam-Level: X-Spam-Status: No, score=-10.491 tagged_above=-999 required=5 tests=[AWL=0.107, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qo52eefwggEY for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 02:40:09 -0700 (PDT) Received: from rcdn-iport-4.cisco.com (rcdn-iport-4.cisco.com [173.37.86.75]) by ietfa.amsl.com (Postfix) with ESMTP id 9B60521F8B4E for <6tsch@ietf.org>; Thu, 29 Aug 2013 02:40:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=37748; q=dns/txt; s=iport; t=1377769208; x=1378978808; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=sHQApoJ5Nqa7IzGVP1cL4aW13QZBEIazo8fnXo209XM=; b=eyQUmaDGgdhtvvPJjNHfZDe5EnhSVH0BgHY4bBcXuM4Pd7UVzrWwpHx3 EtiBXmtyWq6QlAzWdVbtPgVF/8x7RYuvnY6tbreUCQ5DHLwjjm+W9LwSp oyJaEnjWTjDY4H3QYmQsZVL2JyAAPRR/hG65eDkdKI/f6Y94NhLi59fNU U=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgkFAIcWH1KtJXHB/2dsb2JhbABXAw6CNUQ1UcAogSoWdIIkAQEBAwEBAQEkBhwlCwULAgEIEQQBAQEKFgEGBycLFAkIAgQBDQUIE4dgBgy4e44qEYEIIQsBBAYBCQiDC4EAA4VKgzKgXYJhP4FxOQ X-IronPort-AV: E=Sophos;i="4.89,982,1367971200"; d="scan'208,217";a="253139805" Received: from rcdn-core2-6.cisco.com ([173.37.113.193]) by rcdn-iport-4.cisco.com with ESMTP; 29 Aug 2013 09:40:07 +0000 Received: from xhc-aln-x07.cisco.com (xhc-aln-x07.cisco.com [173.36.12.81]) by rcdn-core2-6.cisco.com (8.14.5/8.14.5) with ESMTP id r7T9e6rC020130 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 29 Aug 2013 09:40:06 GMT Received: from xmb-rcd-x01.cisco.com ([169.254.1.31]) by xhc-aln-x07.cisco.com ([173.36.12.81]) with mapi id 14.02.0318.004; Thu, 29 Aug 2013 04:40:05 -0500 From: "Pascal Thubert (pthubert)" To: Thomas Watteyne , Qin Wang Thread-Topic: [6tsch] the 4th control flow Thread-Index: AQHOpBqdJOdqNz01RYqfaTSvull3F5mr6Hkg Date: Thu, 29 Aug 2013 09:40:05 +0000 Deferred-Delivery: Thu, 29 Aug 2013 09:40:00 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.49.80.28] Content-Type: multipart/alternative; boundary="_000_E045AECD98228444A58C61C200AE1BD841430178xmbrcdx01ciscoc_" MIME-Version: 1.0 Cc: "6tsch@ietf.org" <6tsch@ietf.org> Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 09:40:14 -0000 --_000_E045AECD98228444A58C61C200AE1BD841430178xmbrcdx01ciscoc_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable +1. I expect that the event flow is the way the device A instructs the controll= er (the PCE) that it needs a track to device B? Pascal From: 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of T= homas Watteyne Sent: mercredi 28 ao=FBt 2013 20:15 To: Qin Wang Cc: 6tsch@ietf.org Subject: Re: [6tsch] the 4th control flow All, If possible, let's keep things simple and stick closely to the charter, cer= tainly for now. I would like to propose the following assumptions: * let's assume signaling and data packets are independent. IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking. [] Agreed * let's consider the steps highlighted in the charter, for now: * draft-vilajosana-6tsch-basic gives us a network with minimal conne= ctivity between all nodes in the network. Most of the schedule is empty, av= ailable ot some dynamic scheduler. * the scheduler uses the minimal connectivity to communicate, either= between neighbors (distributed), or between nodes and the PCE (centralized= ) [] Agreed. Note that if we want to build on that decision for the future, w= e'll want at some point an extension to Basic TiSCH to make it a little bit= more configurable. If we agree with this, I propose we go back to discussing the types of flow= s, per the name of this thread. I'd like to call on a rough consensus for t= he following 4 flows: * ME->node * action * query * node->ME * report * event Thomas On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang > wrote: Thomas, I agree to keep different alternatives, at lease as options. Regarding to what kinds of cells should be used for conveying the report, s= hared cells or dedicated cells, I would like to leave them to configuration= . What do you think? Thanks Qin On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne > wrote: Qin, You bring up a good point: over what cells with the reports travel? Another= questions could be: over what cells will the request to install cells trav= el? I believe that, whatever the policy in place in the network, there will= always need to be some cells installed for infrequent signaling traffic. I= f the report rate is very slow, it might qualify as "infrequent signaling t= raffic". For sure, the request to change the schedule qualifies. Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha s= chedule indicated in the draft can be used for the signaling traffic betwee= n the nodes and the ME. Of course, if the report rate is very high, some de= dicate track might be installed, but I do not believe this is needed, certa= inly not this early on. I agree with Diego that keeping the solution open to different alternative = is key. Thomas On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne > wrote: Qin, Thomas, Alternative (1) adds delay to define the slots to send the event to the ME (propagate the new schedule), while alternative (2) keeps reserved slots waiting for the event to happen= . I think both alternatives should be included, and configured by the ME depe= nding on the network requirements. More thoughts? Diego Dujovne 2013/8/27 Qin Wang >: > Thomas, > > I agree with almost all. Only some comments on "Report Flow". > > As you mentioned, there are two kinds of report scenarios, one is > periodically report, another one is burst report or called as event-drive= n > report. I have no question on how periodically report works, which you > described. But I'm not sure what the best way to handle event-driven repo= rt > is. I think we don't want to assume 6top sublayer is very intelligent, in > another word, the events and the trigger of events should be configured b= y > ME, just like the interval of periodically report. Make sense? > > If you agree to it, the remained issue is when and how the bandwidth for > sending event-driven reports is reserved. Here are two ways I can see. > (1) when a event is triggered, node sends a request to ME and ask some BW= to > send the report. I believe that is how the 4th control flow works. > (2) when ME configure the events and their triggers, ME also provisions s= ome > BW for the node which allows the node to send the report triggered by som= e > event. > > I have no strong opinion on which one is better. But, the bottom line is = the > configuration of the set of events and their triggers should be out of 6t= op > scope. Thought? > > Thanks > Qin > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: >> >> Qin, >> >> Please correct me if I'm wrong: >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typical >> commands are add/delete cells. >> - Query Flow (ME->6top). ME asks 6top for some information. Typical >> queries are about current cells usage or statistics. >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical reported >> information covers cells usage or statistics. >> >> Questions: >> - Looks like Query and Report flows contain the same information. In >> normal operation, the Report flow should be enough, the Query flow only >> being used in special cases, for example when the ME has lost state (jus= t >> booted, bug, etc). Agreed? >> - The ME should be able to configure the report flow. Configuration coul= d >> be "send report every X seconds" or "send report when variable X larger = than >> Y". I imagine this could be done over the action flow? Agreed? >> - A node will want to report an urgent event to the ME. One such events = is >> "the topology appears to have changed". There any many cases where this >> information needs to be sent immediately, i.e. no time to wait for the n= ext >> report cycle. We can consider this to be an asynchronous report, or part= of >> a new "Event" flow. >> - Same for the mote asking the ME for a schedule update. >> >> Thoughts? >> >> Thomas >> >> >> >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: >>> >>> Xavi, >>> >>> Approach-(2) is more flexible and likely covers more situations. But, i= t >>> may bring some complexity to 6top, because 6top has to make decision on= the >>> bandwidth request (add/delete), which needs some metrics, some intellig= ence. >>> >>> What do you think? >>> >>> Qin >>> >>> >>> >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen >>> > w= rote: >>>> >>>> Hi Qin, I like your (2). >>>> >>>> Note also that there are situations that might have some differences. >>>> >>>> 1-the track already exists. >>>> 2-the track between the two entities does not exists >>>> >>>> in either case I think that the node that requires certain BW to anoth= er >>>> node should talk to 6top, which processes that request and sends a req= uest >>>> to the ME, the ME installs that new track. >>>> >>>> does it make sense. Do you see any drawback on that approach? >>>> >>>> X >>>> >>>> >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: >>>>> >>>>> Hi all, >>>>> >>>>> During today's call, we presented three control flows between >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and Re= port >>>>> Flow, and started to talk about the 4th control flow. The thread will >>>>> continue the discussion about 4th flow. >>>>> >>>>> Here is the scenario: when a node finds that more cells are needed, >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be ab= le to >>>>> ask ME to install more bandwidth. >>>>> >>>>> I can see two approaches: >>>>> (1) Managed by ME, without 4th Control Flow. Assume BandwidthUsageRat= e >>>>> is a attribute in 6top. Then, ME can get the information via Query Fl= ow or >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth >>>>> Request to ME, and then ME install more bandwidth. This is the 4th co= ntrol >>>>> flow. >>>>> >>>>> What do you think? Which one makes more sense? >>>>> >>>>> Qin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 6tsch mailing list >>>>> 6tsch@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/6tsch >>>>> >>>> >>> >>> >>> _______________________________________________ >>> 6tsch mailing list >>> 6tsch@ietf.org >>> https://www.ietf.org/mailman/listinfo/6tsch >>> >> >> >> >> -- >> Thomas Watteyne, Ph. D >> Sr. Networking Design Engineer >> Dust Networks / Linear Technology >> 30695 Huntwood Ave >> Hayward, CA 94544-7021 >> +1 (510) 400-2978 >> twatteyne@linear.com >> >> This e-mail transmission, and any documents, files or previous e-mail >> messages attached to it may contain confidential information that is leg= ally >> privileged. If you are not the intended recipient, or a person responsib= le >> for delivering it to the intended recipient, you are hereby notified tha= t >> any disclosure, copying, distribution or use of any of the information >> contained in or attached to this transmission is STRICTLY PROHIBITED. If= you >> have received this transmission in error, please immediately notify me b= y >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original >> transmission and its attachments without reading or saving in any manner= . >> Thank you. > > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch > -- DIEGO DUJOVNE Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP www.ingenieria.udp.cl (56 2) 676 8125 _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch _______________________________________________ 6tsch mailing list 6tsch@ietf.org https://www.ietf.org/mailman/listinfo/6tsch --_000_E045AECD98228444A58C61C200AE1BD841430178xmbrcdx01ciscoc_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    +1.

     <= /p>

    I expect that the event f= low is the way the device A instructs the controller (the PCE) that it need= s a track to device B?

     <= /p>

    Pascal

     <= /p>

    From: 6tsch-bo= unces@ietf.org [mailto:6tsch-bounces@ietf.org] On Behalf Of Thomas Watteyne
    Sent: mercredi 28 ao=FBt 2013 20:15
    To: Qin Wang
    Cc: 6tsch@ietf.org
    Subject: Re: [6tsch] the 4th control flow

     

    All,

     

    If possible, let's keep things simple and stick clos= ely to the charter, certainly for now.

     

    I would like to propose the following assumptions:

    • let's assume signaling and data packets are independent.
      IMO, signaling packets are either short and infrequent (events, commands), = or periodic and large (statistics). Once we have run a number of networks, = and can quantify the trade-offs, we can consider piggybacking.

    [] Agreed

    • let's consider the steps highlighted in the charter, for now:
      • draft-vilajosana-6tsch-basic gives us a network with minimal connectivity b= etween all nodes in the network. Most of the schedule is empty, available o= t some dynamic scheduler.
      • the scheduler uses the minimal connectivity to communicate, either between = neighbors (distributed), or between nodes and the PCE (centralized)

    [] Agreed. Note that if we want t= o build on that decision for the future, we’ll want at some point an extension to Basic TiSCH to make it a little bit more configurabl= e.

    If we agree with this, I propose we go back to discu= ssing the types of flows, per the name of this thread. I'd like to call on = a rough consensus for the following 4 flows:

    • ME->node
      • action
      • query
    • node->ME
      • report
      • event

    Thomas

     

     

    On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang <qinwang@berkeley.edu> wrote:

    Thomas,

     

    I agree to keep different alternatives, at lease as = options.

     

    Regarding to what kinds of cells should be used for = conveying the report, shared cells or dedicated cells, I would like to leav= e them to configuration. What do you think?

     

    Thanks

    Qin<= /p>

     

     

    On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne <= ;watteyne@e= ecs.berkeley.edu> wrote:

    Qin,

     

    You bring up a good point: over what cells with the = reports travel? Another questions could be: over what cells will the reques= t to install cells travel? I believe that, whatever the policy in place in = the network, there will always need to be some cells installed for infrequent signaling traffic. If the report= rate is very slow, it might qualify as "infrequent signaling traffic&= quot;. For sure, the request to change the schedule qualifies.

     

    Isn't the answer draft-vilajosana-6tsch-basic? = That is, the slotted Aloha schedule indicated in the draft can be used for = the signaling traffic between the nodes and the ME. Of course, if the repor= t rate is very high, some dedicate track might be installed, but I do not believe this is needed, certainly not thi= s early on.

     

    I agree with Diego that keeping the solution open to= different alternative is key.

     

    Thomas

     

    On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne= <diego.d= ujovne@mail.udp.cl> wrote:

    Qin, Thomas,
          Alternative (1) adds delay to define the slots to send= the event
    to the ME (propagate the new schedule),
    while alternative (2)  keeps reserved slots waiting for the event to h= appen.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:

    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driven r= eport
    > is. I think we don't want to assume 6top sublayer is very intelligent,= in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is  when and how the bandw= idth for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control flows = between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> += ;1 (510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destroy the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --

    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125=

    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch

     


    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
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    --_000_E045AECD98228444A58C61C200AE1BD841430178xmbrcdx01ciscoc_-- From qinwang@berkeley.edu Thu Aug 29 07:40:52 2013 Return-Path: X-Original-To: 6tsch@ietfa.amsl.com Delivered-To: 6tsch@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C9BB721F9B52 for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 07:40:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.925 X-Spam-Level: X-Spam-Status: No, score=-2.925 tagged_above=-999 required=5 tests=[AWL=0.051, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QzSrgOQQGzQe for <6tsch@ietfa.amsl.com>; Thu, 29 Aug 2013 07:40:47 -0700 (PDT) Received: from mail-ve0-f175.google.com (mail-ve0-f175.google.com [209.85.128.175]) by ietfa.amsl.com (Postfix) with ESMTP id 7D70611E8116 for <6tsch@ietf.org>; Thu, 29 Aug 2013 07:40:45 -0700 (PDT) Received: by mail-ve0-f175.google.com with SMTP id oy10so381314veb.20 for <6tsch@ietf.org>; Thu, 29 Aug 2013 07:40:45 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=gdJAfm1QtOEOzzyIHzgHZM6TO7ZSYV3nnE1q1laKw5c=; b=hhF/xBEZTsX/rEvdoXBfxIhiYT2Hy+4rfJlwus8dNQQdk9O6AsW6tr5qW3o+KcqAY7 5iDmAf1qaaT5UnctKqjcHpbotkjlenTnFukS0lPXcX75M5Ax2+CHDPyvdhWkj57mW5z9 vfeBBWlwx6rJdQ0yHqRcqtlRXWNkSq6nD0gh8b5+5hAj1Or6r8bgP17yiGDDsA0/AKeg i1nzey4Zo9sgOcCf/2PB4qMtvPQU3mYH0LVoQTkyMtCAkCQ7kfjeKTh7LEDPGQ3hTN6m dCR2saLbTJ2NbkiFn1vN2djD6rl2tqtiM0q0YiEJu8622YtS+IXRuSDMI3VrYqwM1uM3 aiKw== X-Gm-Message-State: ALoCoQm6Z6PI6eLQ7548sFXfG54f5UygQ6dnifoBvGNK3UooXCTSjNAj332ln0l3AvwfY+QvOZbx MIME-Version: 1.0 X-Received: by 10.58.235.69 with SMTP id uk5mr3502220vec.17.1377787244873; Thu, 29 Aug 2013 07:40:44 -0700 (PDT) Received: by 10.220.116.135 with HTTP; Thu, 29 Aug 2013 07:40:44 -0700 (PDT) In-Reply-To: References: Date: Thu, 29 Aug 2013 22:40:44 +0800 Message-ID: From: Qin Wang To: Maria Rita PALATTELLA Content-Type: multipart/alternative; boundary=047d7bd6c2c44eb1c504e5171768 Cc: Thomas Watteyne , "6tsch@ietf.org" <6tsch@ietf.org>, "xvilajosana@eecs.berkeley.edu" Subject: Re: [6tsch] the 4th control flow X-BeenThere: 6tsch@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "Discuss link layer model for Deterministic IPv6 over the TSCH mode of IEEE 802.15.4e, and impacts on RPL and 6LoWPAN such as resource allocation" <6tsch.ietf.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 14:40:52 -0000 --047d7bd6c2c44eb1c504e5171768 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Maria Rita, Thank you very much for the updated version. Regarding to who triggers Report Flow and Event Flow, I have different understanding as follows. Being different from Query Flow, both Report Flow and Event Flow are triggered by nodes themselves, instead of a query from ME. In particular, the Report Flow will be triggered by a timer, because it corresponds to periodically reporting behavior; and the Event Flow will be triggered by some event specified by ME in advance, something like a alarm. What do you think? Qin On Thu, Aug 29, 2013 at 5:00 PM, Maria Rita PALATTELLA < maria-rita.palattella@uni.lu> wrote: > All, going back to the definition of the 4 control flows, I tried to > fill some of the TODO rows of the tables that Qin created so far.**** > > ** ** > > An updated version of these tables is attached. I left also some comments > for discussing on.**** > > Any comment is welcome.**** > > ** ** > > Maria Rita**** > > ** ** > > *From:* 6tsch-bounces@ietf.org [mailto:6tsch-bounces@ietf.org] *On Behalf > Of *Xavier Vilajosana Guillen > *Sent:* Thursday, August 29, 2013 12:27 AM > *To:* Qin Wang > *Cc:* Thomas Watteyne; 6tsch@ietf.org > > *Subject:* Re: [6tsch] the 4th control flow**** > > ** ** > > Hi, I also agree with the 4 message flows. > > as regards to Confirmation, this would introduce end-to-end confirmation > at L2.5 - 3. I don't think we need that as a mandatory concept. Maybe an > optional feature? > > > X**** > > ** ** > > On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang wrote:**= * > * > > Thomas,**** > > ** ** > > I agree to the 4 control flows. One more question for the two node->ME > flows: Is a Confirmation from ME to node needed?**** > > ** ** > > Thanks**** > > Qin**** > > ** ** > > On Thu, Aug 29, 2013 at 2:15 AM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > All,**** > > ** ** > > If possible, let's keep things simple and stick closely to the charter, > certainly for now.**** > > ** ** > > I would like to propose the following assumptions:**** > > - let's assume signaling and data packets are independent. > IMO, signaling packets are either short and infrequent (events, > commands), or periodic and large (statistics). Once we have run a numb= er of > networks, and can quantify the trade-offs, we can consider piggybackin= g. > **** > - let's consider the steps highlighted in the charter, for now:**** > > > - draft-vilajosana-6tsch-basic gives us a network with minimal > connectivity between all nodes in the network. Most of the schedule= is > empty, available ot some dynamic scheduler.**** > - the scheduler uses the minimal connectivity to communicate, > either between neighbors (distributed), or between nodes and the PC= E > (centralized)**** > > If we agree with this, I propose we go back to discussing the types of > flows, per the name of this thread. I'd like to call on a rough consensus > for the following 4 flows:**** > > - ME->node**** > > > - action**** > - query**** > > > - node->ME**** > > > - report**** > - event**** > > Thomas**** > > ** ** > > ** ** > > On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang wrote:**= * > * > > Thomas,**** > > ** ** > > I agree to keep different alternatives, at lease as options.**** > > ** ** > > Regarding to what kinds of cells should be used for conveying the report, > shared cells or dedicated cells, I would like to leave them to > configuration. What do you think?**** > > ** ** > > Thanks**** > > Qin**** > > ** ** > > ** ** > > On Wed, Aug 28, 2013 at 6:39 AM, Thomas Watteyne < > watteyne@eecs.berkeley.edu> wrote:**** > > Qin,**** > > ** ** > > You bring up a good point: over what cells with the reports travel? > Another questions could be: over what cells will the request to install > cells travel? I believe that, whatever the policy in place in the network= , > there will always need to be some cells installed for infrequent signalin= g > traffic. If the report rate is very slow, it might qualify as "infrequent > signaling traffic". For sure, the request to change the schedule qualifie= s. > **** > > ** ** > > Isn't the answer draft-vilajosana-6tsch-basic? That is, the slotted Aloha > schedule indicated in the draft can be used for the signaling traffic > between the nodes and the ME. Of course, if the report rate is very high, > some dedicate track might be installed, but I do not believe this is > needed, certainly not this early on.**** > > ** ** > > I agree with Diego that keeping the solution open to different alternativ= e > is key.**** > > ** ** > > Thomas**** > > ** ** > > On Tue, Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne < > diego.dujovne@mail.udp.cl> wrote:**** > > Qin, Thomas, > Alternative (1) adds delay to define the slots to send the event > to the ME (propagate the new schedule), > while alternative (2) keeps reserved slots waiting for the event to > happen. > I think both alternatives should be included, and configured by the ME > depending > on the network requirements. > > More thoughts? > > Diego Dujovne > > 2013/8/27 Qin Wang :**** > > > Thomas, > > > > I agree with almost all. Only some comments on "Report Flow". > > > > As you mentioned, there are two kinds of report scenarios, one is > > periodically report, another one is burst report or called as > event-driven > > report. I have no question on how periodically report works, which you > > described. But I'm not sure what the best way to handle event-driven > report > > is. I think we don't want to assume 6top sublayer is very intelligent, = in > > another word, the events and the trigger of events should be configured > by > > ME, just like the interval of periodically report. Make sense? > > > > If you agree to it, the remained issue is when and how the bandwidth f= or > > sending event-driven reports is reserved. Here are two ways I can see. > > (1) when a event is triggered, node sends a request to ME and ask some > BW to > > send the report. I believe that is how the 4th control flow works. > > (2) when ME configure the events and their triggers, ME also provisions > some > > BW for the node which allows the node to send the report triggered by > some > > event. > > > > I have no strong opinion on which one is better. But, the bottom line i= s > the > > configuration of the set of events and their triggers should be out of > 6top > > scope. Thought? > > > > Thanks > > Qin > > > > > > > > > > > > > > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne > > wrote: > >> > >> Qin, > >> > >> Please correct me if I'm wrong: > >> - Action Flow (ME->6top). ME asks 6top to execute some command. Typica= l > >> commands are add/delete cells. > >> - Query Flow (ME->6top). ME asks 6top for some information. Typical > >> queries are about current cells usage or statistics. > >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical report= ed > >> information covers cells usage or statistics. > >> > >> Questions: > >> - Looks like Query and Report flows contain the same information. In > >> normal operation, the Report flow should be enough, the Query flow onl= y > >> being used in special cases, for example when the ME has lost state > (just > >> booted, bug, etc). Agreed? > >> - The ME should be able to configure the report flow. Configuration > could > >> be "send report every X seconds" or "send report when variable X large= r > than > >> Y". I imagine this could be done over the action flow? Agreed? > >> - A node will want to report an urgent event to the ME. One such event= s > is > >> "the topology appears to have changed". There any many cases where thi= s > >> information needs to be sent immediately, i.e. no time to wait for the > next > >> report cycle. We can consider this to be an asynchronous report, or > part of > >> a new "Event" flow. > >> - Same for the mote asking the ME for a schedule update. > >> > >> Thoughts? > >> > >> Thomas > >> > >> > >> > >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang > wrote: > >>> > >>> Xavi, > >>> > >>> Approach-(2) is more flexible and likely covers more situations. But, > it > >>> may bring some complexity to 6top, because 6top has to make decision > on the > >>> bandwidth request (add/delete), which needs some metrics, some > intelligence. > >>> > >>> What do you think? > >>> > >>> Qin > >>> > >>> > >>> > >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen > >>> wrote: > >>>> > >>>> Hi Qin, I like your (2). > >>>> > >>>> Note also that there are situations that might have some differences= . > >>>> > >>>> 1-the track already exists. > >>>> 2-the track between the two entities does not exists > >>>> > >>>> in either case I think that the node that requires certain BW to > another > >>>> node should talk to 6top, which processes that request and sends a > request > >>>> to the ME, the ME installs that new track. > >>>> > >>>> does it make sense. Do you see any drawback on that approach? > >>>> > >>>> X > >>>> > >>>> > >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang > wrote: > >>>>> > >>>>> Hi all, > >>>>> > >>>>> During today's call, we presented three control flows between > >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Query Flow, and > Report > >>>>> Flow, and started to talk about the 4th control flow. The thread wi= ll > >>>>> continue the discussion about 4th flow. > >>>>> > >>>>> Here is the scenario: when a node finds that more cells are needed, > >>>>> e.g. nodes wants to send 10pkt/s report at some time, it should be > able to > >>>>> ask ME to install more bandwidth. > >>>>> > >>>>> I can see two approaches: > >>>>> (1) Managed by ME, without 4th Control Flow. Assume > BandwidthUsageRate > >>>>> is a attribute in 6top. Then, ME can get the information via Query > Flow or > >>>>> Report Flow, and adjust the bandwidth of the node via Action Flow. > >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends Bandwidth > >>>>> Request to ME, and then ME install more bandwidth. This is the 4th > control > >>>>> flow. > >>>>> > >>>>> What do you think? Which one makes more sense? > >>>>> > >>>>> Qin > >>>>> > >>>>> > >>>>> > >>>>> _______________________________________________ > >>>>> 6tsch mailing list > >>>>> 6tsch@ietf.org > >>>>> https://www.ietf.org/mailman/listinfo/6tsch > >>>>> > >>>> > >>> > >>> > >>> _______________________________________________ > >>> 6tsch mailing list > >>> 6tsch@ietf.org > >>> https://www.ietf.org/mailman/listinfo/6tsch > >>> > >> > >> > >> > >> -- > >> Thomas Watteyne, Ph. D > >> Sr. Networking Design Engineer > >> Dust Networks / Linear Technology > >> 30695 Huntwood Ave > >> Hayward, CA 94544-7021 > >> +1 (510) 400-2978 > >> twatteyne@linear.com > >> > >> This e-mail transmission, and any documents, files or previous e-mail > >> messages attached to it may contain confidential information that is > legally > >> privileged. If you are not the intended recipient, or a person > responsible > >> for delivering it to the intended recipient, you are hereby notified > that > >> any disclosure, copying, distribution or use of any of the information > >> contained in or attached to this transmission is STRICTLY PROHIBITED. > If you > >> have received this transmission in error, please immediately notify me > by > >> reply e-mail, or by telephone at (510) 400-2978, and destroy the > original > >> transmission and its attachments without reading or saving in any > manner. > >> Thank you. > > > > > > > > _______________________________________________ > > 6tsch mailing list > > 6tsch@ietf.org > > https://www.ietf.org/mailman/listinfo/6tsch > > > > > > --**** > > DIEGO DUJOVNE > Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones > Facultad de Ingenier=EDa UDP > www.ingenieria.udp.cl > (56 2) 676 8125**** > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > > ** ** > > ** ** > > > _______________________________________________ > 6tsch mailing list > 6tsch@ietf.org > https://www.ietf.org/mailman/listinfo/6tsch**** > > ** ** > --047d7bd6c2c44eb1c504e5171768 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
    Hi Maria Rita,

    Thank you very much for = the updated version.

    Regarding to who triggers Rep= ort Flow and Event Flow, I have different understanding as follows. Being d= ifferent from Query Flow, both Report Flow and Event Flow are triggered by = nodes themselves, instead of a query from ME. In particular, the Report Flo= w will be triggered by a timer, because it corresponds to periodically repo= rting behavior; and the Event Flow will be triggered by some event specifie= d by ME in advance, something like a alarm.

    What do you think?

    Qin



    On Wed, Aug 28, 2013 at 1:48 PM, Qin Wang <qinwang@berkeley.edu> wrote:
    Thomas,

    = I agree to the 4 control flows. One more question for the two node->ME f= lows: Is a Confirmation from ME to node needed?

    Thanks
    Qin


    On Thu, Aug 2= 9, 2013 at 2:15 AM, Thomas Watteyne <watteyne@eecs.berkeley.edu> wrote:
    All,

    If = possible, let's keep things simple and stick closely to the charter, ce= rtainly for now.

    I would like to propose the following assumptions:
    • let's assume signaling and data packets are independent.
      IMO= , signaling packets are either short and infrequent (events, commands), or = periodic and large (statistics). Once we have run a number of networks, and= can quantify the trade-offs, we can consider piggybacking.
    • let's consider the steps highlighted in the charter, for now:
      • <= ul>
    • draft-vilajosana-6tsch-basic gives us a network with minimal connect= ivity between all nodes in the network. Most of the schedule is empty, avai= lable ot some dynamic scheduler.
    • the scheduler uses the minimal connectivity to communicate, either betw= een neighbors (distributed), or between nodes and the PCE (centralized)
    If we agree with this, I propose we go back to discussing t= he types of flows, per the name of this thread. I'd like to call on a r= ough consensus for the following 4 flows:
    • ME->node
      • action
      • query
      • node->ME
        • report
        • event
      Thomas



    On Wed, Aug 28, 2013 at 7:59 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    Thomas,

    I agree to keep different alter= natives, at lease as options.

    Regarding to what ki= nds of cells should be used for conveying the report, shared cells or dedic= ated cells, I would like to leave them to configuration. What do you think?=

    Thanks
    Qin


    On Wed, Aug 28, 2013 at 6:39 AM, Thomas Wa= tteyne <watteyne@eecs.berkeley.edu> wrote:
    Qin,

    You= bring up a good point: over what cells with the reports travel? Another qu= estions could be: over what cells will the request to install cells travel?= I believe that, whatever the policy in place in the network, there will al= ways need to be some cells installed for infrequent signaling traffic. If t= he report rate is very slow, it might qualify as "infrequent signaling= traffic". For sure, the request to change the schedule qualifies.

    Isn't the answer=A0draft-vilajosana-6tsch-basic? Th= at is, the slotted Aloha schedule indicated in the draft can be used for th= e signaling traffic between the nodes and the ME. Of course, if the report = rate is very high, some dedicate track might be installed, but I do not bel= ieve this is needed, certainly not this early on.

    I agree with Diego that keeping the solution open to di= fferent alternative is key.

    Thomas


    On Tue, = Aug 27, 2013 at 2:29 PM, Prof. Diego Dujovne <diego.dujovne@mail.= udp.cl> wrote:
    Qin, Thomas,
    =A0 =A0 =A0 Alternative (1) adds delay to define the slots to send the even= t
    to the ME (propagate the new schedule),
    while alternative (2) =A0keeps reserved slots waiting for the event to happ= en.
    I think both alternatives should be included, and configured by the ME depe= nding
    on the network requirements.

    More thoughts?

    Diego Dujovne

    2013/8/27 Qin Wang <qinwang@berkeley.edu>:
    > Thomas,
    >
    > I agree with almost all. Only some comments on "Report Flow"= .
    >
    > As you mentioned, there are two kinds of report scenarios, one is
    > periodically report, another one is burst report or called as event-dr= iven
    > report. I have no question on how periodically report works, which you=
    > described. But I'm not sure what the best way to handle event-driv= en report
    > is. I think we don't want to assume 6top sublayer is very intellig= ent, in
    > another word, the events and the trigger of events should be configure= d by
    > ME, just like the interval of periodically report. Make sense?
    >
    > If you agree to it, the remained issue is =A0when and how the bandwidt= h for
    > sending event-driven reports is reserved. Here are two ways I can see.=
    > (1) when a event is triggered, node sends a request to ME and ask some= BW to
    > send the report. I believe that is how the 4th control flow works.
    > (2) when ME configure the events and their triggers, ME also provision= s some
    > BW for the node which allows the node to send the report triggered by = some
    > event.
    >
    > I have no strong opinion on which one is better. But, the bottom line = is the
    > configuration of the set of events and their triggers should be out of= 6top
    > scope. Thought?
    >
    > Thanks
    > Qin
    >
    >
    >
    >
    >
    >
    > On Wed, Aug 28, 2013 at 2:20 AM, Thomas Watteyne <twatteyne@linear.com>
    > wrote:
    >>
    >> Qin,
    >>
    >> Please correct me if I'm wrong:
    >> - Action Flow (ME->6top). ME asks 6top to execute some command.= Typical
    >> commands are add/delete cells.
    >> - Query Flow (ME->6top). ME asks 6top for some information. Typ= ical
    >> queries are about current cells usage or statistics.
    >> - Report Flow (6top->ME). 6top tell ME how it is doing. Typical= reported
    >> information covers cells usage or statistics.
    >>
    >> Questions:
    >> - Looks like Query and Report flows contain the same information. = In
    >> normal operation, the Report flow should be enough, the Query flow= only
    >> being used in special cases, for example when the ME has lost stat= e (just
    >> booted, bug, etc). Agreed?
    >> - The ME should be able to configure the report flow. Configuratio= n could
    >> be "send report every X seconds" or "send report wh= en variable X larger than
    >> Y". I imagine this could be done over the action flow? Agreed= ?
    >> - A node will want to report an urgent event to the ME. One such e= vents is
    >> "the topology appears to have changed". There any many c= ases where this
    >> information needs to be sent immediately, i.e. no time to wait for= the next
    >> report cycle. We can consider this to be an asynchronous report, o= r part of
    >> a new "Event" flow.
    >> - Same for the mote asking the ME for a schedule update.
    >>
    >> Thoughts?
    >>
    >> Thomas
    >>
    >>
    >>
    >> On Fri, Aug 23, 2013 at 11:00 AM, Qin Wang <qinwang@berkeley.edu> wrote:<= br> >>>
    >>> Xavi,
    >>>
    >>> Approach-(2) is more flexible and likely covers more situation= s. But, it
    >>> may bring some complexity to 6top, because 6top has to make de= cision on the
    >>> bandwidth request (add/delete), which needs some metrics, some= intelligence.
    >>>
    >>> What do you think?
    >>>
    >>> Qin
    >>>
    >>>
    >>>
    >>> On Sat, Aug 24, 2013 at 1:47 AM, Xavier Vilajosana Guillen
    >>> <xvilajosana@eecs.berkeley.edu> wrote:
    >>>>
    >>>> Hi Qin, I like your (2).
    >>>>
    >>>> Note also that there are situations that might have some d= ifferences.
    >>>>
    >>>> 1-the track already exists.
    >>>> 2-the track between the two entities does not exists
    >>>>
    >>>> in either case I think that the node that requires certain= BW to another
    >>>> node should talk to 6top, which processes that request and= sends a request
    >>>> to the ME, the ME installs that new track.
    >>>>
    >>>> does it make sense. Do you see any drawback on that approa= ch?
    >>>>
    >>>> X
    >>>>
    >>>>
    >>>> On Fri, Aug 23, 2013 at 10:36 AM, Qin Wang <qinwang@berkeley.edu>= wrote:
    >>>>>
    >>>>> Hi all,
    >>>>>
    >>>>> During today's call, we presented three control fl= ows between
    >>>>> Management Entity (ME) and 6top, i.e. Action Flow, Que= ry Flow, and Report
    >>>>> Flow, and started to talk about the 4th control flow. = The thread will
    >>>>> continue the discussion about 4th flow.
    >>>>>
    >>>>> Here is the scenario: when a node finds that more cell= s are needed,
    >>>>> e.g. nodes wants to send 10pkt/s report at some time, = it should be able to
    >>>>> ask ME to install more bandwidth.
    >>>>>
    >>>>> I can see two approaches:
    >>>>> (1) Managed by ME, without 4th Control Flow. Assume Ba= ndwidthUsageRate
    >>>>> is a attribute in 6top. Then, ME can get the informati= on via Query Flow or
    >>>>> Report Flow, and adjust the bandwidth of the node via = Action Flow.
    >>>>> (2) Managed by 6top, with 4th Control Flow. 6top sends= Bandwidth
    >>>>> Request to ME, and then ME install more bandwidth. Thi= s is the 4th control
    >>>>> flow.
    >>>>>
    >>>>> What do you think? Which one makes more sense?
    >>>>>
    >>>>> Qin
    >>>>>
    >>>>>
    >>>>>
    >>>>> _______________________________________________
    >>>>> 6tsch mailing list
    >>>>> 6t= sch@ietf.org
    >>>>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>>>
    >>>>
    >>>
    >>>
    >>> _______________________________________________
    >>> 6tsch mailing list
    >>> 6tsch@ietf= .org
    >>> https://www.ietf.org/mailman/listinfo/6tsch
    >>>
    >>
    >>
    >>
    >> --
    >> Thomas Watteyne, Ph. D
    >> Sr. Networking Design Engineer
    >> Dust Networks / Linear Technology
    >> 30695 Huntwood Ave
    >> Hayward, CA 94544-7021
    >> +1 (510) 400-2978
    >> twatteyn= e@linear.com
    >>
    >> This e-mail transmission, and any documents, files or previous e-m= ail
    >> messages attached to it may contain confidential information that = is legally
    >> privileged. If you are not the intended recipient, or a person res= ponsible
    >> for delivering it to the intended recipient, you are hereby notifi= ed that
    >> any disclosure, copying, distribution or use of any of the informa= tion
    >> contained in or attached to this transmission is STRICTLY PROHIBIT= ED. If you
    >> have received this transmission in error, please immediately notif= y me by
    >> reply e-mail, or by telephone at (510) 400-2978, and destro= y the original
    >> transmission and its attachments without reading or saving in any = manner.
    >> Thank you.
    >
    >
    >
    > _______________________________________________
    > 6tsch mailing list
    > 6tsch@ietf.org=
    > https://www.ietf.org/mailman/listinfo/6tsch
    >



    --
    DIEGO DUJOVNE
    Acad=E9mico Escuela de Ingenier=EDa en Inform=E1tica y Telecomunicaciones Facultad de Ingenier=EDa UDP
    www.ingenieria.u= dp.cl
    (56 2) 676 8125
    _______________________________________________
    6tsch mailing list
    6tsch@ietf.org
    h= ttps://www.ietf.org/mailman/listinfo/6tsch


    _______________________________________________
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