Network Working Group H. Jang
Request for Comments: 5270 SAMSUNG
Category: Informational J. Jee
ETRI
Y. Han
KUT
S. Park
SAMSUNG Electronics
J. Cha
ETRI
June 2008
Mobile IPv6 Fast Handovers over IEEE 802.16e Networks
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Abstract
This document describes how a Mobile IPv6 Fast Handover can be
implemented on link layers conforming to the IEEE 802.16e suite of
specifications. The proposed scheme tries to achieve seamless
handover by exploiting the link-layer handover indicators and thereby
synchronizing the IEEE 802.16e handover procedures with the Mobile
IPv6 fast handover procedures efficiently.
Jang, et al. Informational [Page 1]RFC 5270 FMIPv6 over 802.16e June 2008Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. IEEE 802.16e Handover Overview . . . . . . . . . . . . . . . . 4
4. Network Topology Acquisition and Network Selection . . . . . . 5
5. Interaction between FMIPv6 and IEEE 802.16e . . . . . . . . . 6
5.1. Access Router Discovery . . . . . . . . . . . . . . . . . 6
5.2. Handover Preparation . . . . . . . . . . . . . . . . . . . 7
5.3. Handover Execution . . . . . . . . . . . . . . . . . . . . 8
5.4. Handover Completion . . . . . . . . . . . . . . . . . . . 9
6. The Examples of Handover Scenario . . . . . . . . . . . . . . 10
6.1. Predictive Mode . . . . . . . . . . . . . . . . . . . . . 10
6.2. Reactive Mode . . . . . . . . . . . . . . . . . . . . . . 12
7. IEEE 802.21 Considerations . . . . . . . . . . . . . . . . . . 14
8. Security Considerations . . . . . . . . . . . . . . . . . . . 14
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
10.1. Normative References . . . . . . . . . . . . . . . . . . . 15
10.2. Informative References . . . . . . . . . . . . . . . . . . 16
1. Introduction
Mobile IPv6 Fast Handover protocol (FMIPv6) [RFC5268] was proposed to
complement the Mobile IPv6 (MIPv6) [RFC3775] by reducing the handover
latency for the real-time traffic. FMIPv6 assumes the support from
the link-layer technology; however, the specific link-layer
information available and its available timing differs according to
the particular link-layer technology in use, as pointed out in
[RFC4260], which provides an FMIPv6 solution for the IEEE 802.11
networks. So, this document is proposed to provide an informational
guide to the developers about how to optimize the FMIPv6 handover
procedures, specifically in the IEEE 802.16e networks
[IEEE802.16][IEEE802.16e].
The proposed scheme achieves seamless handover by exploiting the
link-layer handover indicators and designing an efficient
interleaving scheme of the 802.16e and the FMIPv6 handover
procedures. The scheme targets a hard handover, which is the default
handover type of IEEE 802.16e. For the other handover types, i.e.,
the Macro Diversity Handover (MDHO) and Fast Base Station Switching
(FBSS), the base stations in the same diversity set are likely to
belong to the same subnet for diversity, and FMIPv6 might not be
needed. Regarding the MDHO and the FBSS deployment with FMIPv6,
further discussion will be needed and is not in the scope of this
document.
Jang, et al. Informational [Page 2]RFC 5270 FMIPv6 over 802.16e June 2008
We begin with a summary of handover procedures of [IEEE802.16e] and
then present the optimized complete FMIPv6 handover procedures by
using the link-layer handover indicators. The examples of handover
scenarios are described for both the predictive mode and reactive
mode.
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