Re:

["Atsushi Takeshita" <takeshita@dcl.docomo-usa.com>]

Hi.

I'm reviewing the discussion.
Sorry for my non-timely reply.

>    Session Mobility
>    The wireless Internet framework needs to support the ability of the
>    user to maintain sessions, including continuity of Internet sessions
>    (e.g., http, ssl, tcp, telnet, ftp), during any discontinuity in the
>    access network and while changing between terminal devices and/or
>    access technologies. For example,
>    * the user of a mobile terminal needs to be able to transfer a
>    session to a laptop with DSL connection without losing a specific
>    session;
>    * as a session transfers from an IMT-IS-2000 RAN to an 802.11 LAN
>    via handoff from one access network to another, the wireless
>    Internet framework needs to support session continuity both within
>    the core and in interfaces to other networks.
> 
> DLB:  If using Mobile IP, IP applications are unaware of changes in the
> access link.

Session mobility means the mobility between two (or more) 
terminals.
I don't think Mobile IP can be applied to this.

>  Accounting
>    * on a fixed charge basis, (e.g. fixed charge for an SMS message)
> 
> DLB: I don't understand this.  If I have an always on IP connection that
> I am paying for which uses yahoo instant messaging, why does the
> service provider need know about this.
>
> If the service provider, supports an instant messaging service, then
> they can bill based on the application accounting info.
>
>    * on the basis of access to the end service or content (e.g. micro-
>    charging)
> 
> DLB:  Not sure I understand this.  Whoever owns the application server
> bill for the application usage.  Again if the service provider, provides
> applications then they bill for them at the application level.

I agree with you.
The important thing is to keep appropriate application
account ing  information which enables various kinds of 
charging.

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TAKESHITA, Atsushi
DoCoMo Communications Laboratories USA, Inc.
takeshita@dcl.docomo-usa.com
Tel: 408-451-4705 / Fax: 408-573-1090
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