Re:

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

Dana,

> The second example above seems to imply handoff from one
> access network to another with the same terminal.  Mobile
> IP works for this.

I agree.

> The first example and your definition suggests that a user
> is using one terminal
> then starts using another terminal and needs some mobility
> between the useage of each terminal.  Can you provide
> a specific application and usage scenario where this is
> important ?

At this moment, I don't find any applications like that.
However, in the future, I think we will have such applications.
Let me give two examples.
1) A user is videoconferencing the mobile 
  terminal. Then the user transfer the videoconference
  to a videoconference system connected to a fixed network.
2) A user is playing a network game on mobile a terminal.
  The the user transfer the game to the game terminal like
  PlayStation.

My definition of session mobility may be different from 
one described in the I-D.

> Is accounting information for application usage an area that
> you think the IETF should consider standardizing ?  I am not
> aware of work in the IETF in this area, but I can check if needed.

I'm not sure.
But it seems it's out of IETF's scope.

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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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