AW: Re: 3GPP - paging references

Stefan Bauer stefan.bauer at cubewerk.de
Thu Jan 12 21:05:49 UTC 2012


Hi,

Well thank you for your answer. I thought i could simply call my phone, the network would page it and i would have the imsi/tmsi. As i'm in a very busy cell, there are huge amounts of pagings. I have to rethink my first idea.

Stefan

----- Ursprüngliche Nachricht -----
Von: Sylvain Munaut <246tnt at gmail.com>
Gesendet: Donnerstag, 12. Januar 2012 18:28
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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