Recurring outbound GPRS Attach Accept messages

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Alexander Chemeris alexander.chemeris at gmail.com
Mon Aug 27 17:32:12 UTC 2012


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--
Regards,
Alexander Chemeris
CEO, Fairwaves LLC
http://fairwaves.ru
27.08.2012 18:07 пользователь "Don A. Bailey" <
donb at capitolhillconsultants.com> написал:

> All,
> Apologies if this is the wrong mailing list for this question. If so,
> please redirect me to the appropriate Osmocom list. Thanks!
>
> I'm having trouble with some older 2G cellular modules. When they initiate
> GPRS, the GPRS Attach Accept response from the SGSN seems to be dropped on
> the floor. I thought this was because the inbound TLLI generated by the ME
> was not included in the subsequent response. However, I verified that the
> LLC correctly generates the response and attaches the TLLI. I'm not quite
> sure why these particular 2G modules are not receiving the response as the
> message seems to be correctly submitted from the SGSN to the BTS.
>
> The result is that the GPRS state will get "stuck" on the ME side, which
> will keep attempting to Attach until it gives up and issues a Detach
> message (under the same TLLI).
>
> Can anyone clue me in on what potential issues may be caused by this ME
> and how/if I can patch this problem in the SGSN?
>
> Thank you,
> D
>
>
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