One document matched: draft-sijeon-multimob-mms-pmip6-00.txt
Network Working Group Seil Jeon
Internet-Draft Soongsil University
Expires: January 04, 2010 Younghan Kim
Soongsil University
Jaehwoon Lee
Dongguk University
July 04, 2009
Mobile Multicasting Support in Proxy Mobile IPv6
draft-sijeon-multimob-mms-pmip6-00.txt
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Internet-Draft Mobile Multicasting Support in PMIPv6 July 2009
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Internet-Draft Mobile Multicasting Support in PMIPv6 July 2009
Abstract
To support IP-based group communication such as mobile IPTV in mobile
environment, 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
provide efficient mobile multicast service related to two problems,
we present a multicasting architecture and fast handover scheme for
Proxy Mobile IPv6 (PMIPv6).
Table of Contents
1. Introduction.....................................................4
2. Conventions & Terminology........................................4
3. PMIPv6 Multicasting Architecture.................................5
4. Handover Operation...............................................6
5. Message Formats..................................................7
6. IANA Considerations..............................................7
7. Security Considerations..........................................7
8. References.......................................................7
8.1. Normative References.........................................7
Author's Address....................................................9
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Internet-Draft Mobile Multicasting Support in PMIPv6 July 2009
1. Introduction
High performance of wireless technologies make multimedia streaming
services possible, such as IPTV audio/video stream. These services
are based on group communication, and 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 protocol for
mobile multicasting has depended on host-based Mobile IP variants
(Mobile IP and Fast Mobile IPv6). However, Mobile IP variant
protocols require modifications to an applied solution on mobile
device, as well as 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: the
tunnel convergence problem and high handover latency [5]. Thus, we
present a multicasting architecture and fast handover operation while
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-related signaling for an 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 P-
MAG forecasting MN's destination N-MAG. This message includes the
MN ID, the MN home network prefix, and the P-MAG IP address, and
the multicast group address of the MN executing handoff.
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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 an 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 separated the MR function from the LMA. Moreover, if a
MAG has an MR function and if a local MR is connected with MAGs, the
routing update overhead degrades the performance of PMIPv6 components
due to the frequent movement of the MNs. Thus, Figure 1 shows a
proposed PMIPv6 multicasting architecture where the MAG contains only
an MLD forwarding proxy function using the IGMP/MLD forwarding proxy
[6] proposed by the IETF. This model can solve the tunnel convergence
problem and reduce the routing processing overhead. In this draft, we
consider only the point-to-point link between the MN and the MAG as
defined in RFC 5213 [3]. Therefore, some optimized techniques are
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required to reduce duplicated multicasting over the point-to-point
link.
4. Handover Operation
MN pMAG nMAG 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 caused by the
MLD query/report. To solve this problem, we proposed a fast handover
scheme using the context transfer mechanism. Figure 2 shows the
handover operation. When an MN hands off, the MAG with the MLD
forwarding proxy predicts an MN's movement direction and transfers
the multicast context message, which includes the MN ID, the MN home
network prefix, the current MAG address, and the multicast group
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address. The N-MAG then checks whether it is receiving a 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 an MLD report.
5. Message Formats
To suit the format of the Proxy MIPv6 messages, PMIPv6 multicast
context transfer option message is encoded according to the message
data encoding rules for the Mobility Header (MH) as specified in
[RFC3775]. Parameters being carried by any of these messages are
encoded as message options according to the type-length-value format
specified in [RFC3775]. Specified about the message and message
option format are 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. 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.
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[3] S. Gundavelli, K. Leung, V. Devarapalli, K. Chowdhury, and B.
Patil, "Proxy Mobile IPv6", IETF RFC 5213, Augurst 2008.
[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
Soongsil University
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
Soongsil University
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
Jaehwoon Lee
Dongguk University
26, 3-ga Pil-dong,
Chung-gu, Seoul 100-715, KOREA
E-mail: jaehwoon@dongguk.edu
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