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
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Internet-Draft Mobile Multicasting Support in PMIPv6 March 2009
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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Internet-Draft Mobile Multicasting Support in PMIPv6 March 2009
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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