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Our Fast Handovers research attempts to minimize the handover latency when a mobile node moves from one access network to another. We've identified four sources of delay, and at least one solution which eliminates each of these delays:
| Movement Detection Delay | --> | L2 Triggers |
| Router Advertisement Delay | --> | Fast RA |
| Duplicate Address Detection Delay | --> | Optimistic DAD, MLD-DAD |
| Binding Update RTT | --> | HMIPv6, Edge Handovers |
Optimistic Duplicate Address Detection is an interoperable
modification of the existing IPv6 Neighbor Discovery (RFC2461) and
Stateless Address Autoconfiguration (RFC2462) process. The intention
is to minimize address configuration delays in the successful case,
to reduce disruption as far as possible in the failure case and to
remain interoperable with unmodified hosts and routers.
This draft describes a possible optimization to Duplicate Address Detection (DAD) which can be used to successfully terminate DAD early, based on the presence of listeners on the link-scope solicited nodes multicast address.
Edge Handovers (EH) is an interoperable enhancement to Mobile IPv6 to
reduce handover latency for movement within an edge network, and to
reduce handover signalling outside the edge network.
EH does this by tunnelling traffic within the edge network, allowing
a mobile node to maintain a stable Care-of Address while moving.
Tunnel Buffering (TB) is an interoperable enhancement to Mobile IPv6
to reduce packet loss during movement, and to avoid retransmission
when movement is complete.
TB does this by 'pausing' the packets which are to be send over a
MobileIPv6 or HMIPv6 tunnel until movement is complete.
These patches are free software; you can redistribute them and/or modify them under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.These patches are distributed in the hope that they will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
| Monash University ABN 12 377 614 012 Copyright © 2002-2004 Monash University - Last Date Modified: 2005-12-06 - Caution |
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