Hi,

            Let me participate in the discussion to improve my understanding.
            If I see well the new TLLI (after changing by Attach Accept for example)  may be obtained from the first RLC data block belonging to the UL TBF allocated for Attach Complete transfer (in the case of resource request on RACH) or from still existing DL TBF context   (in the case the channel request is included in PACCH downlink packet ack/nack) where it has to be updated on P-TMSI change. For paging group choosing in the later stage (after attaching procedure) it's enough that IMSI is known in SGSN and  delivered to pcu with the downlink packets.

Regards,
Vladimir.



On Mon, Oct 28, 2013 at 5:23 PM, Holger Hans Peter Freyther <hfreyther@sysmocom.de> wrote:
On Mon, Oct 28, 2013 at 06:17:50PM +0400, Ivan Kluchnikov wrote:
> Hi Holger,

Hi,

>
> Can you send full pcu tbf debug log for this attach procedure?
> I want to understand, in which place of TBF MS starts use new TLLI.
> What do you mean by "no content resolution on the UL"?

s/content resolution/contention resolution/. Sorry.

I don't have a log file but with the routing area update, the
SGSN may assign a new P-TMSI and if a new P-TMSI was assigned
with the "Accept" message, a "Complete" message needs to be
generated by the MS. This message can/should already contain
the new TLLI (which is derived from the P-TMSI).



> Also I can't understand why we should use IMSI in pcu?
> Why it is not enough to use TLLI?

The TLLI is either random (I have not seen this), foreign
or local. In the last two cases it is derived from the P-TMSI.
The P-TMSI can change (e.g. at routing area update).

--
- Holger Freyther <hfreyther@sysmocom.de>       http://www.sysmocom.de/
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