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Versions: 00 01                                                         
Network Working Group                                          Seil Jeon
Internet-Draft                                  Univ. of Soongsil, Korea
Expires: September 7, 2009                                  Younghan Kim
                                                Univ. of Soongsil, Korea
                                                           March 7, 2009


            Mobile Multicasting Support in Proxy Mobile IPv6
                  draft-sijeon-netlmm-mms-pmip6-01.txt

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
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   This Internet-Draft will expire on September 7, 2009.

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Abstract

   To support IP-based group mobile communication, such as mobile IPTV,
   IP multicasting is required. Two major constraints in mobile
   multicasting are the tunnel convergence problem and high handover
   latency. To reduce the constraints, several mobile multicasting
   schemes based on Mobile IP have been proposed. To meet requirements,
   we present a multicasting architecture and fast handover scheme for
   Proxy Mobile IPv6 (PMIPv6).


Table of Contents

   1. Introduction.....................................................3
   2. Conventions & Terminology........................................3
   3. PMIPv6 Multicasting Architecture.................................4
   4. Handover Operation...............................................4
   5. Message Formats..................................................4
   6. IANA Considerations..............................................5
   7. Acknowledgment...................................................6
   7. Security Considerations..........................................6
   8. Acknowledgment...................................................6
   9. References.......................................................6
     9.1. Normative References.........................................6
   Author's Address....................................................8




















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1. Introduction

   High performance of wireless technologies enable multimedia streaming
   service such as IPTV audio/video stream. Since these services are
   based on group communication, IP multicasting is also required.
   Traditional IP multicast mechanisms, including multicast routing and
   membership management protocols, have been designed for static hosts
   [2]. Moreover, up to now, IP mobility protocols for mobile
   multicasting depended on host-based Mobile IP variants (Mobile IP and
   Fast Mobile IPv6). However, Mobile IP variant protocols require
   modifications to a applied solution on mobile devices and IP
   reconfiguration during handoff. The Proxy Mobile IPv6 (PMIPv6) in [3]
   does not require any mobility related protocol and IP reconfiguration
   in the same PMIPv6 domain. With the strength of PMIPv6, several
   service solutions are described in [4]. However, the solution needs
   to solve two major constraints which are the tunnel convergence
   problem and high handover latency [5]. Thus, we present a
   multicasting architecture and fast handover operation considering the
   requirements for PMIPv6.

2. Terminology and Functional Components

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [1].
   o  Mobile Node (MN)

   o  Previous Mobile Access Gateway (P-MAG) - The MAG that manages
      mobility relaged signaling for a MN before handover. In this
      document, a MAG and Access Router (AR) are collocated

   o  New Mobile Access Gateway (N-MAG) - The MAG that manages mobility
      related signaling for the MN after handover

   o  Multicast Router (MR)

   o  MLD Forwarding Proxy (MF-Proxy)


   o  PMIPv6 Multicast Context Transfer (MCT) - It is transmitted by the
      P-MAG forecasting MN's destination to the N-MAG. This message
      includes a MN ID, a MN home network prefix and a P-MAG IP address,



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      and multicast group address of the MN executing handoff.



3. PMIPv6 Multicasting Architecture



                                                Multicast Core Tree
                                                          :
                                                          :
                                                          |
                        +----------+                 +----------+
                        |   LMA    |                 | Local MR |
                        +----------+                 +----------+
                             |                            |
                             |-----------------+          |
                             |       |          |
                             |         +------------------|
                             |         |       |          |
                        +----------+      |    |    +----------+
                        |  P-MAG   |---+       +----|  N-MAG   |
                        |(MF-Proxy)|                |(MF-Proxy)|
                        +----------+                +----------+
                             :                           :
                          +------+                    +------+
                          |  MN  |   ----->           |  MN  |
                          +------+                    +------+

           Figure 1: Multicasting architecture in PMIPv6 domain


   To design PMIPv6-based multicasting services, we should consider the
   position of the multicast router (MR). If a LMA contains the MR
   function, it introduces a tunnel convergence problem similar to
   Mobile IP variant bi-directional tunnel schemes. To solve the
   problem, we separate the MR function from the LMA. Moreover, if a MAG
   has a MR function and a local MR is connected with MAGs, the routing
   update overhead degrades the performance of PMIPv6 components due to
   frequent MNs' movement. Thus, Figure 1 shows the proposed PMIPv6
   multicasting architecture where the MAG only contains a MLD
   forwarding proxy function using the IGMP/MLD forwarding proxy [6]



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   proposed by the IETF. This model can solve the tunnel convergence
   problem and reduce the routing processing overhead.

4. Handover Operation

          MN         P-MAG       N-MAG        LMA         MR   Multicast Tree
           |           |           |           |           |           |
           |           |           |           |           |           |
     Link->|       Handover        |           |           |           |
   Disconnected    Detection       |           |           |           |
           |           |           |           |           |           |
           |           |--PMIPv6-->|           |           |           |
           |           | Multicast |           |           |           |
           |           |  Context  |           |           |           |
           |           |  Transfer |           |           |           |
           |           |           |           |           |           |
           |           |           |-MLD Membership Report>|           |
           |           |           |           |           |           |
           |---- L2 Attachment --->|           |           |           |
           |           |           |  Proxy    |           |           |
           |           |           |--Binding->|           |           |
           |           |           |  Update   |           |           |
           |           |           |           |           |           |
           |           |           |  Proxy    |           |           |
           |           |           |<-Binding--|           |           |
           |           |           |  Ack.     |           |           |
           |           |           |           |           |           |
           |<--------------------------Multicast Data------------------|
           |           |           |           |           |           |
           |           |           |           |           |           |


           Figure 2: Fast multicast handover procedure using PMIPv6

   Directly applying a PMIPv6 handover scheme to the proposed network
   model leads to service disruption due to the latency cased by MLD
   query/report. To solve this problem, we propose a fast handover
   scheme using the context transfer mechanism. Figure 2 shows handover
   operation. When a MN hands off, the MAG with MLD forwarding proxy
   predicts an MN's movement direction and transfers the multicast
   context message, which includes the MN ID, the MN home network



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   prefix, the current MAG address, and the multicast group address.
   Then, the N-MAG checks whether it is a receiving node of multicast
   data corresponding to the group requested by the P-MAG. If this is
   not the case, it joins the group by sending a MLD report.

5. Message Formats

   TBD

6. IANA Considerations

   TBD

7. Security Considerations

   This document does not discuss any special security concerns in
   detail.  The protocol of this document is built on the assumption
   that all participating nodes are trusted each other as well as there
   is no adversary who modifies/injects false messages to corrupt the
   procedures.

8. Acknowledgment

   This work was supported by the IT R&D program of MKE/IITA. [Research
   on Ubiquitous Mobility Management Methods for Higher Service
   Availability]

8. References

   8.1. Normative References


[1]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
     Levels", BCP 14, RFC 2119, March 1997.


[2]  R. Vida, and L. Costa, "Multicast Listener Discovery Version(MLDv2)
     for IPv6," IETF RFC 3810, June 2004.


[3]  S. Gundavelli, K. Leung, V. Devarapalli, K. Chowdhury, and B.
     Patil, "Proxy Mobile IPv6", IETF RFC 5213, Augurst 2008.



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[4]  Y. K. Zhao, P. Seite, "The Solution for PMIPv6 Multicast Service,"
     draft-zhao-multimob-pmip6-solution-02.txt, November 2008.


[5]  I. Romdhani, M. Kellil, and H. Lach, "IP Mobile Multicast : Chal-
     lenges and Solutions," IEEE Communications Surveys & Tutorials,
     vol. 6, no. 1, pp. 18-41, 2004.


[6]  B. Fenner, H. He, B. Haberman, and H. Sandick, "Internet Group Man-
     agement Protocol (IGMP) / Multicast Listener Discovery (MLD)-Based
     Multicast Forwarding ("IGMP/MLD Proxying")", IETF RFC 4605, August
     2006.
































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Author's Addresses

   Seil Jeon
   University of Soongsil in Seoul
   11F Hyungnam Engineering Bldg. 317, Sangdo-Dong,
   Dongjak-Gu, Seoul 156-743 Korea
   Phone: +82 2 814 0151
   E-mail: sijeon@dcn.ssu.ac.kr

   Younghan Kim
   University of Soongsil in Seoul
   11F Hyungnam Engineering Bldg. 317, Sangdo-Dong,
   Dongjak-Gu, Seoul 156-743 Korea
   Phone: +82 2 820 0904
   E-mail: yhkim@dcn.ssu.ac.kr






























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