RE: WG Last Call: draft-ietf-v6ops-3gpp-cases-02.txt

[<juha.wiljakka@nokia.com>]

Hi, Alain!

Thanks for your comments! Finally replying to you...

-----Original Message-----
From: ext BAUDOT Alain FTRD/DMI/CAE
[mailto:alain.baudot@rd.francetelecom.com]
Sent: 13 March, 2003 18:45

First paragraphe of section 2 :

"The scope of this document is to describe the possible transition 
   scenarios in the 3GPP defined GPRS network where a UE connects to, or
   is contacted from, the Internet or another UE. The document describes
   scenarios with and without the usage of the SIP based IP Multimedia 
   Core Network Subsystem (IMS).   "

Since the abstract specifies that "The focus of this document is on the
scenarios where the User Equipment (UE) connects to nodes in other
networks, e.g. in the Internet.", it is no clear to me wether the other
UE may be connected to the same network than the UE initiating the
connection, or not.

 JW: The other UE can be connected to the same network or then to a different network. 
We are not making limitations in this document. (note that the peer node can be any node, 
e.g. an application server).

I've been rather surprised by the last paragraphe of section 2 :

"These scenarios may or may not be found feasible, or even likely in
further study."

One may be confused since one may understand scenarios have nothing to
do with reallity. It maybe rephrased stating that the scenarios match
real cases and that a subset of them are likely to be met in a given
architecture.   

 JW: Yep, we will make some rewording (as I already commented on the list).

Last, second paragraph section 4.1 : 

"Transition scenarios of the GPRS internal interfaces are outside of the
scope of this document." 

I guess this is because the UE has limited ressources and that running
internal transition mechanism is likely to be avoided. I wonder in that
case if it should explicitly specified.

 JW: This comment is related to the 3GPP architecture. As you probably
know, we have two IP layers there, let's call them user IP layer and
network IP layer. We only analyze the (upper) user IP layer here and do not
analyze the network IP layer. That means that e.g. the IP layer between the SGSN 
and the GGSN is out of scope.

I hope this helps a bit.

 JW: Certainly - many thanks!

Cheers,
	 -Juha W.