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Title : Fast Handovers for Multiple Interfaces Mobile IPv6
Author(s) : J. Lee, et al.
Filename : draft-jylee-monami6-fast-handoff-00.txt
Pages : 21
Date : 2007-7-8
This document introduces extensions to Fast-handover Mobile IPv6 [6]
that improves handover latency in Mobile IPv6 procedures in case
mobile nodes have multiple wireless interfaces. In the basic Fast
MIPv6 [6], the PAR (previous access router) forwards the arriving
packets for the mobile node to the NAR (new access router) by setting
up a tunnel to the NAR in order to prevent packet losses incurred by
handover latency during handover procedure. Recently, many mobile
nodes begin to have multiple wireless interfaces, and multiple active
IPv6 Care-of-Addresses are assigned and registered simultaneously to
a Home Agent [2] in order to utilize multiple wireless interfaces in
terms of bandwidth, delay, etc. Furthermore, the Mobile IPv6 with
extension to multiple CoA registration also needs fast handover
procedure to reduce handover latency and packet losses. However, in
the Mobile IPv6 with multiple CoA registration, packet tunneling to a
NAR during handoff of one interface can incur performance degradation
due to severe packet reordering when multiple interfaces are
simultaneously used for load sharing. This is because the partial
traffic flow coming from the interface involved in handover is
suspended during handover and later tunneled to a NAR, while the
other partial traffic flow is continuously forwarded to the mobile
node through the other stable interface, which could incur severe
reordering if the handover is delayed or unstable by ping-pong
effects. We thus propose in this document an extension to Fast
handover Mobile IPv6 procedure which can indicate a specific
tunneling destination except the NAR, for example, other interfaces
(or CoAs) in the same mobile node. This extension not only enhances
the traffic quality during handoff but also improves the handover
signaling performance because data traffic is redirected to another
interface during handover signaling.
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