AW: Re: 3GPP - paging references

Stefan Bauer stefan.bauer at cubewerk.de
Fri Jan 13 13:01:25 UTC 2012


Sylvain,

I just red that if early assignment is used (non-oascu) in a ms terminating call, there is no channel request on RACH by ms. I still dont quite get then howto match imsi/tmsi to an immediate assignment.

stefan

----- Ursprüngliche Nachricht -----
Von: Sylvain Munaut <246tnt at gmail.com>
Gesendet: Donnerstag, 12. Januar 2012 18:30
An: Stefan Bauer <stefan.bauer at cubewerk.de>
Cc: baseband-devel at lists.osmocom.org
Betreff: Re: 3GPP - paging references

Hi,

> In detail how can i match the paging for my specific imsi/tmsi to the data-channel assignment?

You can't ... There is no relation between paging and the channel assignment.

When the phone sees he's being paged, he will initiate the channel
request procedure.

He sends a RACH at a given time fn with a random reference (8bits).
And then he looks for assignement matching his RACH (i.e. the time fn
and random reference are repeated back by the network in the
assignment so that a phone knows the channel was for it).

Cheers,

    Sylvain






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