Mobile IPv6 Fast Handovers over IEEE 802.16e Networks
RFC 5270

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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 2008

Table 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.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document is to be interpreted as described in [RFC2119].