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Subject: Re: [dmm] DMM BOF
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Hi Jari,

Sorry for the late response. we are working on the PS/Scenario drafts
and the work plan those days.

First of all, thanks a lot for the suggestions. we have several points
to clarify:

1. Regarding the motivation of Distributed and Dynamic Mobility Management:
  As you mentioned, Mobile IP is not widely deployed in real life but
3GPP has specified IP based mobility protocol in IWLAN and SAE. Many
operators are considering to deploy IWLAN and SAE today. Regarding the
flat network architecture evolution, many operators are also very
interested, the reason is that it can provide flexible ways to offload
user's Internet traffic and save the backbone cost. That is why we
have four operators (France Telecom, KDDI, Telecom Italy, China
Mobile) who are very actively involved in this DDMM work. Also, in
3GPP, people are working on the SIPTO/LIPA architecture; So in that
sense, the flat architecture is becoming reality.

Specially, the motivation comes from many aspects:

Existing mobile networks are hierarchical, and existing mobility
solutions deployed with centralized mobility anchoring are more prone
to the following problems or limitations compared with distributed and
dynamic mobility management:

   (1) Routing via a centralized anchor is often longer, so that those
mobility protocol deployments that lack optimization extensions
results in non-optimal routes, affecting performance; whereas routing
optimization may be an integral part of in a distributed design.
   (2) As mobile network becomes more flattened centralized mobility
management, which is currently deployed to support hierarchical
network, can become more non-optimal, especially  as the content
servers in a content delivery network (CDN) are moving closer to the
access network; in contrast, distributed mobility management can
support both hierarchical network and more flattened network as it
also supports CDN networks.
   (3) Centralized route maintenance and context maintenance for a
large number of mobile hosts is more difficult to scale.
   (4) Scalability may worsen if mobility support is provided to all
mobile hosts without mechanism to distinguish whether there are real
need; dynamic mobility management, i.e., to selectively provide
mobility support, is needed and may be better implemented with
distributed mobility management.
  (5) Deployment is sophisticated with the numerous variants and extensions
   of mobile IP; better integration of these variants and extensions may
   be found in a distributed and dynamic design which can selectively
   adapt to the needs.
  (6) Excessive signaling overhead should be avoided when end nodes
are able to communicate end-to-end; capability to selectively turn off
unwanted signaling will reduce the handover delay.
  (7) Centralized approach is generally more vulnerable to a single
point of failure and attack often requiring duplication and backups,
whereas a distributed approach intrinsically mitigates the problem to
a local network so that the needed protection can be simpler.

2. Regarding the scope and plan of Distributed and Dynamic Mobility
Management, we have the following initial thoughts:

1) Define the problem statement and associated requirements for
distributed mobility management. This work aims at defining the
problem space and identifies the key functional requirements.
2) Produce a gap analysis mapping the above requirements against
existing solutions.
3) Give best practices for the deployment of existing mobility
protocols in a distributed mobility management and describe
limitations of each such approach.
4) Describe extensions, if needed, to current mobility protocols for
their application in distributed mobility architectures

We are considering both network based and MN based mobility protocols,
and we are also considering a better integration of
{MIP/PMIP/FMIP/HMIP/AMIP/BMIP/CMIP/.../ZMIP} in the " mixed flat"
architecture (there may not be a "totally flat" architecture but maybe
a " mixed architecture" which may have both centralized anchors for
the operator's own service and local anchors for the Internet access
service; better integration of different variants of mobile IP in that
scenario is needed.). Considering that, we think DDMM  may be outside
the scope of MEXT which is focus on extensions of DSMIP.

Best Regards,
Dapeng Liu

2010/9/29, Jari Arkko <jari.arkko@piuha.net>:
> Folks,
>
> There will not be a separate DMM BOF at IETF-79. However, we have
> reserved time in the MEXT meeting to discuss this topic.
>
> In order to make that discussion most fruitful, here's some further
> guidance on how you should scope the discussion and what you should be
> working on before the meeting. The original BOF description had two
> parts, one that focused on operational advice on how to use existing
> protocols in as "flat" network model as possible, and another part which
> focused on creating new solutions. I think there are good technical
> reasons why a distributed model is interesting: potentially more shorter
> paths, elimination of overhead for non-moving nodes, less reliance on
> central nodes, etc. However, at this stage I do not yet see wide-spread
> demand for a completely new architecture, and I must confess that I'm
> not entirely happy about the deployment success of any IETF mobility
> solutions. So some care is needed so that we do not jump into creating
> new solutions without solid demand. However, I do recognize that a lot
> could be done within the existing frameworks. In particular, I would be
> interested in seeing how Mobile IP-based architecture can be used in a
> distributed manner. For instance, home agents could perhaps run more in
> the network edge devices than on some central nodes, helping eliminate
> unnecessary mobility signaling and tunnels for the many cases where the
> hosts are actually still in the area served by the edge device. To do
> this we need to look at many aspects:
>
> - operational considerations of running home agent functionality on the
> edge devices
> - discovery and bootstrapping of the suitable home agent
> - using multiple home agents as you move around and retain sessions
> - ...
>
> Some of these items are operational, i.e., we only need to figure out
> how to use the existing protocols. Others may require protocol
> extensions. All of this should be in scope for the discussion at MEXT.
>
> Thoughts, comments?
>
> Jari
>
> _______________________________________________
> dmm mailing list
> dmm@ietf.org
> https://www.ietf.org/mailman/listinfo/dmm
>

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Subject: [dmm] DMM problem statement and scenario draft
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Hello all,

After several weeks and many contributor's hard working, we finished
DMM problem statement and scenario draft:

http://tools.ietf.org/html/draft-chan-distributed-mobility-ps-00
http://tools.ietf.org/html/draft-yokota-dmm-scenario-00

Besides, we have the following introduction and initial work plan of DMM:

---------------------------------------------------------------------------=
--------------------------
Work plan proposal -- Distributed and Dynamic Mobility Management
=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

In the past decade a fair number of mobility protocols have been
standardized. Although the protocols differ in terms of functions and
associated message format, we can identify a few key common features:
=95presence of a centralized mobility anchor providing global
reachability and an always-on experience
=95extensions to optimize handover performance while users roam across
wireless cells
=95extensions to enable the use of heterogeneous wireless interfaces for
multi-mode terminals (e.g. cellular phones)
The presence of the centralized mobility anchor allows a mobile device
to be reachable when it is not connected to its home domain. The
anchor, among other tasks, ensures forwarding of packets destined to
or sent from the mobile device. As such, most of the deployed
architectures today have a small number of centralized anchors
managing the traffic of millions of mobile subscribers.

To optimize handovers for mobile users, the base protocols have been
extended to efficiently handle packet forwarding between the previous
and new points of attachment. These extensions are necessary when
applications impose stringent requirements in terms of delay. Notions
of localization and distribution of local agents have been introduced
to reduce signalling overhead. Unfortunately today we witness
difficulties in getting such protocols deployed, often leading to
sub-optimal choices. Moreover, all the availability of multi-mode
devices and the possibility to use several network interfaces
simultaneously have motivated the development of more new protocol
extensions.

Mobile users are, more than ever, consuming Internet content, and
impose new requirements on mobile core networks for data traffic
delivery. When this traffic demand exceeds available capacity, service
providers need to implement new strategies such as selective traffic
offload (e.g. 3GPP work items LIPA/SIPTO) through alternative access
networks (e.g. WLAN). Moreover, the localization of content providers
closer to the Mobile/Fixed Internet Service Providers network requires
taking into account local Content Delivery Networks (CDNs) while
providing mobility services.

As long as demand exceeds capactity, both offloading and CDN
techniques could benefit from the development of more flat mobile
architectures (i.e., fewer levels of routing hierarchy introduced into
the data path by the mobility management system). This view is
reinforced by the shift in users=92 traffic behaviour, aimed at
increasing direct communications among peers in the same geographical
area. The development of truly flat mobile architectures would result
in anchoring the traffic closer to point of attachment of the user and
overcoming the suboptimal routing issues of a centralized mobility
scheme.

While deploying [1] today=92s mobile networks, service providers face
new challenges. More often than not, mobile devices remain attached to
the same point of attachment, in which case specific IP mobility
management support is not required for applications that launch and
complete while connected to the same point of attachment. However, the
mobility support has been designed to be always on and to maintain the
context for each mobile subscriber as long as they are connected to
the network. This can result in a waste of resources and
ever-increasing costs for the service provider. Infrequent mobility
and intelligence of many applications suggest that mobility can be
provided dynamically, thus simplifying the context maintained in the
different nodes of the mobile network.

The proposed charter will address two complementary aspects of
mobility management procedures: the distribution of mobility anchors
to achieve a more flat design and the dynamic activation/deactivation
of mobility protocol support as an enabler to distributed mobility
management. The former has the goal of positioning mobility anchors
(HA, LMA) closer to the user; ideally, these mobility anchors could be
collocated with the first hop router. The latter, facilitated by the
distribution of mobility anchors, aims at identifying when mobility
must be activated and identifying sessions that do not impose mobility
management -- thus reducing the amount of state information to be
maintained in the various mobility anchors of the mobile network. The
key idea is that dynamic mobility management relaxes some constraints
while also repositioning mobility anchors; it avoids the establishment
of non optimal tunnels between two anchors topologically distant.

Considering the above, the working group will:
=95Define the problem statement and associated requirements for
distributed mobility management. This work aims at defining the
problem space and identifies the key functional requirements.
=95Produce a gap analysis mapping the above requirements against
existing solutions.
=95Give best practices for the deployment of existing mobility protocols
in a distributed mobility management and describe limitations of each
such approach.
=95Describe extensions, if needed, to current mobility protocols for
their application in distributed mobility architectures

[1] G. Kirby, "Locating the User", Communication International, 1995
---------------------------------------------------------------------------=
-------------------------

Please feel free to comment. Thanks.


Best Regards,
Dapeng Liu

From sjkoh@knu.ac.kr  Wed Oct 27 16:51:08 2010
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Subject: Re: [dmm] DMM problem statement and scenario draft
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Thanks for sincere efforts.

It seems that the initial drafts and the proposed WG charter will be a good triggering point toward 
DMM.
The stepwise approach for design of DMM are also reasonable.

Some comments are:
1) The design of DMM needs to be done in the viewpoint of (generic) Functiona Architecture,
rather than based on specific protocols (MIP, PMIP), since  DMM may be used in the future
emerging networks (not identified yet) as well as in the current MIP/PMIP networks.

2) At present, the main target network to DMM may be the LTE/SAE or 4G mobile networks.
In the drafts, it is very helpful to describe the associated requirements and applicability 
statements.

Hope to have useful discussion and decision in the upcoming IETF meeting.

Regards,

*************************
Seok Joo Koh
sjkoh@knu.ac.kr
http://protocol.knu.ac.kr/


----- Original Message ----- 
From: "liu dapeng" <maxpassion@gmail.com>
To: "dmm" <dmm@ietf.org>
Cc: "charles.perkins" <charles.perkins@tellabs.com>; "caozhen" <caozhen@chinamobile.com>; "MELIA 
TELEMACO" <Telemaco.Melia@alcatel-lucent.com>; "Wassim Haddad" <wassim.haddad@ericsson.com>; 
"denghui02" <denghui02@hotmail.com>
Sent: Tuesday, October 19, 2010 5:12 PM
Subject: [dmm] DMM problem statement and scenario draft


Hello all,

After several weeks and many contributor's hard working, we finished
DMM problem statement and scenario draft:

http://tools.ietf.org/html/draft-chan-distributed-mobility-ps-00
http://tools.ietf.org/html/draft-yokota-dmm-scenario-00

Besides, we have the following introduction and initial work plan of DMM:

-----------------------------------------------------------------------------------------------------
Work plan proposal -- Distributed and Dynamic Mobility Management
==================================================

In the past decade a fair number of mobility protocols have been
standardized. Although the protocols differ in terms of functions and
associated message format, we can identify a few key common features:
•presence of a centralized mobility anchor providing global
reachability and an always-on experience
•extensions to optimize handover performance while users roam across
wireless cells
•extensions to enable the use of heterogeneous wireless interfaces for
multi-mode terminals (e.g. cellular phones)
The presence of the centralized mobility anchor allows a mobile device
to be reachable when it is not connected to its home domain. The
anchor, among other tasks, ensures forwarding of packets destined to
or sent from the mobile device. As such, most of the deployed
architectures today have a small number of centralized anchors
managing the traffic of millions of mobile subscribers.

To optimize handovers for mobile users, the base protocols have been
extended to efficiently handle packet forwarding between the previous
and new points of attachment. These extensions are necessary when
applications impose stringent requirements in terms of delay. Notions
of localization and distribution of local agents have been introduced
to reduce signalling overhead. Unfortunately today we witness
difficulties in getting such protocols deployed, often leading to
sub-optimal choices. Moreover, all the availability of multi-mode
devices and the possibility to use several network interfaces
simultaneously have motivated the development of more new protocol
extensions.

Mobile users are, more than ever, consuming Internet content, and
impose new requirements on mobile core networks for data traffic
delivery. When this traffic demand exceeds available capacity, service
providers need to implement new strategies such as selective traffic
offload (e.g. 3GPP work items LIPA/SIPTO) through alternative access
networks (e.g. WLAN). Moreover, the localization of content providers
closer to the Mobile/Fixed Internet Service Providers network requires
taking into account local Content Delivery Networks (CDNs) while
providing mobility services.

As long as demand exceeds capactity, both offloading and CDN
techniques could benefit from the development of more flat mobile
architectures (i.e., fewer levels of routing hierarchy introduced into
the data path by the mobility management system). This view is
reinforced by the shift in users’ traffic behaviour, aimed at
increasing direct communications among peers in the same geographical
area. The development of truly flat mobile architectures would result
in anchoring the traffic closer to point of attachment of the user and
overcoming the suboptimal routing issues of a centralized mobility
scheme.

While deploying [1] today’s mobile networks, service providers face
new challenges. More often than not, mobile devices remain attached to
the same point of attachment, in which case specific IP mobility
management support is not required for applications that launch and
complete while connected to the same point of attachment. However, the
mobility support has been designed to be always on and to maintain the
context for each mobile subscriber as long as they are connected to
the network. This can result in a waste of resources and
ever-increasing costs for the service provider. Infrequent mobility
and intelligence of many applications suggest that mobility can be
provided dynamically, thus simplifying the context maintained in the
different nodes of the mobile network.

The proposed charter will address two complementary aspects of
mobility management procedures: the distribution of mobility anchors
to achieve a more flat design and the dynamic activation/deactivation
of mobility protocol support as an enabler to distributed mobility
management. The former has the goal of positioning mobility anchors
(HA, LMA) closer to the user; ideally, these mobility anchors could be
collocated with the first hop router. The latter, facilitated by the
distribution of mobility anchors, aims at identifying when mobility
must be activated and identifying sessions that do not impose mobility
management -- thus reducing the amount of state information to be
maintained in the various mobility anchors of the mobile network. The
key idea is that dynamic mobility management relaxes some constraints
while also repositioning mobility anchors; it avoids the establishment
of non optimal tunnels between two anchors topologically distant.

Considering the above, the working group will:
•Define the problem statement and associated requirements for
distributed mobility management. This work aims at defining the
problem space and identifies the key functional requirements.
•Produce a gap analysis mapping the above requirements against
existing solutions.
•Give best practices for the deployment of existing mobility protocols
in a distributed mobility management and describe limitations of each
such approach.
•Describe extensions, if needed, to current mobility protocols for
their application in distributed mobility architectures

[1] G. Kirby, "Locating the User", Communication International, 1995
----------------------------------------------------------------------------------------------------

Please feel free to comment. Thanks.


Best Regards,
Dapeng Liu
_______________________________________________
dmm mailing list
dmm@ietf.org
https://www.ietf.org/mailman/listinfo/dmm 


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From maxpassion@gmail.com  Thu Oct 28 12:51:53 2010
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From: liu dapeng <maxpassion@gmail.com>
To: Seok Joo Koh <sjkoh@knu.ac.kr>
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Cc: "charles.perkins" <charles.perkins@tellabs.com>, caozhen <caozhen@chinamobile.com>, MELIA TELEMACO <Telemaco.Melia@alcatel-lucent.com>, Wassim Haddad <wassim.haddad@ericsson.com>, dmm <dmm@ietf.org>, denghui02 <denghui02@hotmail.com>
Subject: Re: [dmm] DMM problem statement and scenario draft
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Hi Seok,

Thanks for the comments,

2010/10/28, Seok Joo Koh <sjkoh@knu.ac.kr>:
> Thanks for sincere efforts.
>
> It seems that the initial drafts and the proposed WG charter will be a go=
od
> triggering point toward
> DMM.
> The stepwise approach for design of DMM are also reasonable.
>
> Some comments are:
> 1) The design of DMM needs to be done in the viewpoint of (generic)
> Functiona Architecture,
> rather than based on specific protocols (MIP, PMIP), since  DMM may be us=
ed
> in the future
> emerging networks (not identified yet) as well as in the current MIP/PMIP
> networks.

Are you suggesting that DMM should not be extensions of current
protocols and need a totally new design?

> 2) At present, the main target network to DMM may be the LTE/SAE or 4G
> mobile networks.
> In the drafts, it is very helpful to describe the associated requirements
> and applicability
> statements.
>
> Hope to have useful discussion and decision in the upcoming IETF meeting.

You are welcomed to join the discussion.


Best regards,
Dapeng Liu

> Regards,
>
> *************************
> Seok Joo Koh
> sjkoh@knu.ac.kr
> http://protocol.knu.ac.kr/
>
>
> ----- Original Message -----
> From: "liu dapeng" <maxpassion@gmail.com>
> To: "dmm" <dmm@ietf.org>
> Cc: "charles.perkins" <charles.perkins@tellabs.com>; "caozhen"
> <caozhen@chinamobile.com>; "MELIA
> TELEMACO" <Telemaco.Melia@alcatel-lucent.com>; "Wassim Haddad"
> <wassim.haddad@ericsson.com>;
> "denghui02" <denghui02@hotmail.com>
> Sent: Tuesday, October 19, 2010 5:12 PM
> Subject: [dmm] DMM problem statement and scenario draft
>
>
> Hello all,
>
> After several weeks and many contributor's hard working, we finished
> DMM problem statement and scenario draft:
>
> http://tools.ietf.org/html/draft-chan-distributed-mobility-ps-00
> http://tools.ietf.org/html/draft-yokota-dmm-scenario-00
>
> Besides, we have the following introduction and initial work plan of DMM:
>
> -------------------------------------------------------------------------=
----------------------------
> Work plan proposal -- Distributed and Dynamic Mobility Management
> =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
>
> In the past decade a fair number of mobility protocols have been
> standardized. Although the protocols differ in terms of functions and
> associated message format, we can identify a few key common features:
> =95presence of a centralized mobility anchor providing global
> reachability and an always-on experience
> =95extensions to optimize handover performance while users roam across
> wireless cells
> =95extensions to enable the use of heterogeneous wireless interfaces for
> multi-mode terminals (e.g. cellular phones)
> The presence of the centralized mobility anchor allows a mobile device
> to be reachable when it is not connected to its home domain. The
> anchor, among other tasks, ensures forwarding of packets destined to
> or sent from the mobile device. As such, most of the deployed
> architectures today have a small number of centralized anchors
> managing the traffic of millions of mobile subscribers.
>
> To optimize handovers for mobile users, the base protocols have been
> extended to efficiently handle packet forwarding between the previous
> and new points of attachment. These extensions are necessary when
> applications impose stringent requirements in terms of delay. Notions
> of localization and distribution of local agents have been introduced
> to reduce signalling overhead. Unfortunately today we witness
> difficulties in getting such protocols deployed, often leading to
> sub-optimal choices. Moreover, all the availability of multi-mode
> devices and the possibility to use several network interfaces
> simultaneously have motivated the development of more new protocol
> extensions.
>
> Mobile users are, more than ever, consuming Internet content, and
> impose new requirements on mobile core networks for data traffic
> delivery. When this traffic demand exceeds available capacity, service
> providers need to implement new strategies such as selective traffic
> offload (e.g. 3GPP work items LIPA/SIPTO) through alternative access
> networks (e.g. WLAN). Moreover, the localization of content providers
> closer to the Mobile/Fixed Internet Service Providers network requires
> taking into account local Content Delivery Networks (CDNs) while
> providing mobility services.
>
> As long as demand exceeds capactity, both offloading and CDN
> techniques could benefit from the development of more flat mobile
> architectures (i.e., fewer levels of routing hierarchy introduced into
> the data path by the mobility management system). This view is
> reinforced by the shift in users=92 traffic behaviour, aimed at
> increasing direct communications among peers in the same geographical
> area. The development of truly flat mobile architectures would result
> in anchoring the traffic closer to point of attachment of the user and
> overcoming the suboptimal routing issues of a centralized mobility
> scheme.
>
> While deploying [1] today=92s mobile networks, service providers face
> new challenges. More often than not, mobile devices remain attached to
> the same point of attachment, in which case specific IP mobility
> management support is not required for applications that launch and
> complete while connected to the same point of attachment. However, the
> mobility support has been designed to be always on and to maintain the
> context for each mobile subscriber as long as they are connected to
> the network. This can result in a waste of resources and
> ever-increasing costs for the service provider. Infrequent mobility
> and intelligence of many applications suggest that mobility can be
> provided dynamically, thus simplifying the context maintained in the
> different nodes of the mobile network.
>
> The proposed charter will address two complementary aspects of
> mobility management procedures: the distribution of mobility anchors
> to achieve a more flat design and the dynamic activation/deactivation
> of mobility protocol support as an enabler to distributed mobility
> management. The former has the goal of positioning mobility anchors
> (HA, LMA) closer to the user; ideally, these mobility anchors could be
> collocated with the first hop router. The latter, facilitated by the
> distribution of mobility anchors, aims at identifying when mobility
> must be activated and identifying sessions that do not impose mobility
> management -- thus reducing the amount of state information to be
> maintained in the various mobility anchors of the mobile network. The
> key idea is that dynamic mobility management relaxes some constraints
> while also repositioning mobility anchors; it avoids the establishment
> of non optimal tunnels between two anchors topologically distant.
>
> Considering the above, the working group will:
> =95Define the problem statement and associated requirements for
> distributed mobility management. This work aims at defining the
> problem space and identifies the key functional requirements.
> =95Produce a gap analysis mapping the above requirements against
> existing solutions.
> =95Give best practices for the deployment of existing mobility protocols
> in a distributed mobility management and describe limitations of each
> such approach.
> =95Describe extensions, if needed, to current mobility protocols for
> their application in distributed mobility architectures
>
> [1] G. Kirby, "Locating the User", Communication International, 1995
> -------------------------------------------------------------------------=
---------------------------
>
> Please feel free to comment. Thanks.
>
>
> Best Regards,
> Dapeng Liu
> _______________________________________________
> dmm mailing list
> dmm@ietf.org
> https://www.ietf.org/mailman/listinfo/dmm
>
>

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