Network Working Group H. Yokota
Request for Comments: 5271 KDDI Lab
Category: Informational G. Dommety
Cisco Systems, Inc.
June 2008
Mobile IPv6 Fast Handovers for 3G CDMA 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
Mobile IPv6 is designed to maintain its connectivity while moving
from one network to another. It is adopted in 3G CDMA networks as a
way to maintain connectivity when the mobile node (MN) moves between
access routers. However, this handover procedure requires not only
movement detection by the MN, but also the acquisition of a new
Care-of Address and Mobile IPv6 registration with the new care-of
address before the traffic can be sent or received in the target
network. During this period, packets destined for the mobile node
may be lost, which may not be acceptable for a real-time application
such as Voice over IP (VoIP) or video telephony. This document
specifies fast handover methods in the 3G CDMA networks in order to
reduce latency and packet loss during handover.
Yokota & Dommety Informational [Page 1]RFC 5271 3G CDMA Fast Handover June 2008Table of Contents
1. Introduction ....................................................2
2. Requirements Notation ...........................................3
3. Terminology .....................................................3
4. Network Reference Model for Mobile IPv6 over 3G CDMA Networks ...4
5. Fast Handover Procedures ........................................6
5.1. Predictive Fast Handover ...................................7
5.2. Reactive Fast Handover ....................................12
5.3. Considerations on the Link Indications ....................15
6. Message Format .................................................15
6.1. Handover Assist Information Option ........................15
6.2. Mobile Node Identifier Option .............................16
6.3. New Flag Extension to FBU Message .........................17
6.4. New Flag Extension to PrRtAdv Message .....................17
7. Security Considerations ........................................18
8. IANA Considerations ............................................18
9. Acknowledgements ...............................................19
10. References ....................................................19
10.1. Normative References .....................................19
10.2. Informative References ...................................19
1. Introduction
Mobile IPv6 [2] allows mobile nodes (MNs) to maintain persistent IP
connectivity while the MN moves around in the IPv6 network. It is
adopted in 3G CDMA networks for handling host-based mobility
management [12]. During handover, however, the mobile node (MN)
needs to switch the radio link to obtain a new Care-of Address (CoA)
and to re-register with the home agent (HA), which may cause a
communication disruption. This is not desirable for real-time
applications such as VoIP and video telephony. To reduce this
disruption time or latency, a fast handover protocol for Mobile IPv6
[3] is proposed. RFC 4260 [7] further describes how this Mobile IPv6
Fast Handover could be implemented on link layers conforming to the
IEEE 802.11 suite of specifications. However, 3G CDMA and IEEE
802.11 networks are substantially different in the radio access, the
representations of the network nodes or parameters, and the network
attachment procedures; for example, the beacon scanning or New Access
Router (NAR) discovery based on [Access Point Identifier, Access
Router-info (AP-ID, AR-info)] tuples specified in RFC 4260 can not be
directly applied to 3G CDMA networks. This document therefore
specifies how Mobile IPv6 fast handovers can be applied in the 3G
CDMA networks.
Yokota & Dommety Informational [Page 2]RFC 5271 3G CDMA Fast Handover June 20082. Requirements Notation
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
datatracker.ietf.org