Multicast Mobility (multimob)
-----------------------------

Charter
Last Modified: 2011-12-09

Current Status: Active Working Group

Chair(s):
    Stig Venaas  <[email protected]>
    Behcet Sarikaya  <[email protected]>

Internet Area Director(s):
    Ralph Droms  <[email protected]>
    Jari Arkko  <[email protected]>

Internet Area Advisor:
    Jari Arkko  <[email protected]>

Mailing Lists:
    General Discussion:[email protected]
    To Subscribe:      https://www.ietf.org/mailman/listinfo/multimob
    Archive:           http://www.ietf.org/mail-archive/web/multimob/current/maillist.html

Description of Working Group:

The Multicast mobility (multimob) working group provides guidance
for supporting multicast in a mobile environment. The scope of work
will be limited to Proxy Mobile IPv6, IGMPv3/MLDv2 protocols and
listener mobility. The group will work on extensions of Proxy Mobile
IPv6 to improve its capability to handle multicast efficiently. Work
requiring modifications to IGMPv3/MLDv2 is out of scope in this
stage of this working group, however, as are modifications to
multicast routing protocols.

Specific goals for the group are:

- A solution to the tunnel convergence problem by separating
  multicast routing from a mobility anchor. Possible techniques are
  using native infrastructure, using a dedicated mobility anchor
  etc.

- Mechanisms to optimize multicast traffic during a handover. Such
  mechanisms may include context transfer functionality.

- Mechanisms needed to support multicast source mobility. Both any
  source multicast and source specific multicast source mobility
  will be covered.

- Document the configuration of IGMPv3/MLDv2 in mobile environments

The group shall primarily focus on Proxy Mobile IPv6 (PMIPv6) based
networks when looking at the first three items. It is possible but
not required that the solutions are applicable also for Mobile IPv6
(MIPv6) based networks.

For background, the PMIPv6 specification as defined in RFC 5213 does
not describe how to support multicast. Some forms of multicast
support can, however, be built in the involved nodes by using
existing capabilities of multicast protocols and the underlying
mobility protocols. The working group has already documented how
existing mechanisms can be used to support multicast, without
requiring any additions or changes to message types and parameters
specified in RFC 5213, and assuming an unmodified mobile host. The
current goals of the working group relate to improving the
efficiency of this base solution.

IGMPv3/MLDv2 has been specified for wired networks with shared links.
Mobile nodes have needs that are specific to wireless networks and
mobility (e.g. entering a dormant mode to conserve battery power,
minimizing the latency for joining and leaving a group in support of
movement).

In performing its work, the working group will work closely with
both the mobility community (NETEXT WG) and the multicast community
(MBONED WG). The group will consider both source specific multicast
and any source multicast multicast models.

Future work, subject to rechartering, may study/evaluate extensions
to IGMPv3/MLDv2 to support better operation in mobile environments.

Goals and Milestones:

  Nov 2010       Initial version of a document on how to tune IGMPv3/MLDv2 for
               mobility

  Apr 2011       Submit a document on how to tune IGMPv3/MLDv2 for mobility, for
               publication as either Informational or Best Current Practice

  Jun 2011       Initial version of document on PMIPv6 routing optimizations to
               avoid tunnel convergence problem

  Nov 2011       Initial version of document on PMIPv6 multicast source mobility
               solution

  Nov 2011       Initial version of document on PMIPv6 handover optimizations

  Jun 2012       Submit PMIPv6 routing optimizations document to IESG for
               publication as Internet Standard

  Nov 2012       Submit PMIPv6 handover optimizations document to IESG for
               publication as Internet Standard

  Nov 2012       Submit PMIPv6 multicast source mobility solution to IESG for
               publication as Internet Standard

  Dec 2012       Decision to include additional optimization work involving
               extensions to IGMPv3 or MLDv2

  Dec 2012       Recharter based on the above decisions (or close the group if
               no new work is needed)


Internet-Drafts:

Posted Revised         I-D Title   <Filename>
------ ------- --------------------------------------------
May 2011 Oct 2011   <draft-ietf-multimob-igmp-mld-tuning-02.txt>
               Tuning the Behavior of IGMP and MLD for Routers in Mobile and
               Wireless Networks

Jan 2012 Jan 2012   <draft-ietf-multimob-pmipv6-source-00.txt>
               Mobile Multicast Sender Support in Proxy Mobile IPv6 (PMIPv6)
               Domains

Request For Comments:

 RFC   Stat Published     Title
------- -- ----------- ------------------------------------
RFC6224 I    Apr 2011    Base Deployment for Multicast Listener Support in Proxy
                      Mobile IPv6 (PMIPv6) Domains

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