[More] Session Mobility

[amish.chana@orange.co.uk]

Hi,

With reference to the section on session mobility, which requires the ability to
transfer and maintain sessions across different access technologies. What
thoughts do others on this mailing list have with respect to the requirements
and complexity potential solutions may have on the network?
Are these requirements really necessary?
Should session mobility (depending on the type of service) not be the
responsibility of the mobile terminal rather than the network?

IMHO somes of these requirements could be addressed and realised by some of the
work on end-point multi-homing being performed by other WGs. SCTP,
draft-ohta-e2e-multihoming-02.txt and the multi6 WG may offer solutions to the
Session Mobility requirments without requiring the need for additional network
functionality.

As an example, the application sessions mentioned in the draft (http, ssl, tcp,
telnet, ftp) and the ability to transfer them from
a IMT-2000 RAN to a 802.11 LAN or other access technology could be achieved with
 multi-homing. Supporting, session
transfers within the network requires a network element to maintain session
state information. Failure of this element
would impact all currently active sessions. In a multi-homed end-point scenario
the failure of the access network elements
does not impact sessions.


Regards,
Amish




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