A new draft on adapting FMIPv6 to vertical handoffs

Hi all,

We have written two new drafts on adapting FMIPv6 to
vertical handoffs
and make-before-break handoffs in general through the use of
bicasting. I gave a presentation on the BBSD protocol in
July in
Montreal at the Mobopts meeting under the name SafetyNet
focusing on
its effects on performance
(http://users.tkk.fi/~lpetande/drafts/SafetyNet-ietf66.p
df).

Feedback on these protocol extensions would be very welcome.

Regards,
Henrik Petander

1) http://www.ietf.org/internet-drafts
/draft-petander-mipshop-fmipv6-bbsd-00.txt

"More and more mobile nodes are being equipped with
multiple radios,
such as 3G and 802.11. This document specifies use of
Bicasting with
Buffering and Selective Delivery (BBSD) with Fast Handovers
for Mobile
IPv6 (RFC 4068). The BBSD scheme takes advantage of the
additional
radio capabilities of Mobile Nodes. As in Simultaneous
Bindings for
Fast Handovers, the BBSD extension uses bicasting to allow a
Mobile
Node to continue receiving packets directly from the
Previous Access
Router during the handoff process. In addition, the
selective delivery
uses sequence numbers in the bicasted packets to enable the
New Access
Router to only deliver those packets from its buffer that
the Mobile
Node has not already received directly from the Previous
Access
Router. This reduces the overhead of bicasting and mitigates
the
negative impacts of packet duplication on the application
performance
in Mobile Node."

2) http://www.ietf.org/internet-drafts/d
raft-petander-mipshop-bicasthdr-00.txt

The BBSD protocol uses the bicast header to recognize
duplicate packets.

"Bicasting or multicasting of traffic can be used to
reduce the impact
of a handoff by allowing a Mobile Node to receive a stream
via
multiple paths simultaneously. However, receiving of
multiple copies
of the packets may have a negative impact on applications
which cannot
distinguish duplicate packets. This holds true for all
applications
using TCP which mistakes the packet duplication from
bicasting with
congestion and reduces the sending rate drastically. This
document
specifies an IPv6 destination option header which can be
used to
identify and discard duplicate copies of bicasted
packets."

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