Re: [Dime] Call for WG adoption: draft-jones-diameter-group-signaling-01

Hi Jouni and Mark,
The problem statement is valid and the solution can work in basic scenarios. 

However the solution may have some limit in roaming scenario.

Consider a network having a WLAN AN (hosting a Diameter Client) requesting some 3G internet resources, visited network proxies and home network server as below:

Client -------------- <Visited n/w proxy 1> ---------- {Home network server}
         -------------- <Visited n/w proxy 2> ----------{Home network server}

The session path can be established through either of the visited n/w proxies. For all the messages of same session, client can ensure that the session path through stateful nodes is maintained. The visited n/w proxies would require that the session path be maintained for offline charging etc.
In this scenario, if client uses group signalling method to terminate all sessions in a group using GSTR, only the proxy in the GSTR-GSTA path will be aware of session termination. Since there are no follow-up messages, there is no mechanism to let the other proxy know that the sessions are terminated.
This problem can be avoided in Server initiated group signalling cases (GRAR & GASR) as the PER_SESSION mode can be used for follow up exchanges.
Thus the current solution has a limit if client uses group signalling method for session termination in roaming cases.

I volunteer to work together with Mark to find a solution for this case.

I'm NOT aware of any IPR in this area.

Tina

> -----Original Message-----
> From: dime-bounces@ietf.org [mailto:dime-bounces@ietf.org] On Behalf Of
> jouni korhonen
> Sent: Sunday, April 01, 2012 12:20 PM
> To: dime@ietf.org
> Cc: dime-chairs@tools.ietf.org
> Subject: [Dime] Call for WG adoption: draft-jones-diameter-group-
> signaling-01
> 
> 
> Folks,
> 
> During the Dime WG meeting in Paris we decided to adopt draft-jones-
> diameter-group-signaling-01
> "Diameter Group Signaling" as a working group I-D. The I-D is an input for
> the charter mile stone 'Protocol extension for bulk and group signaling'.
> 
> This mail starts a one week verification for the adoption. If you have
> strong concerns that the
> draft-jones-diameter-group-signaling-01 is not appropriate as a _basis_
> for the solution, then express your concerns on the mailing list by 8th
> April.
> 
> - Jouni & Lionel
> 
> 
> _______________________________________________
> DiME mailing list
> DiME@ietf.org
> https://www.ietf.org/mailman/listinfo/dime