Update on GSM network at 26C3

Sylvain Munaut 246tnt at gmail.com
Thu Dec 17 23:03:35 CET 2009


Hi,

If you are interested, you could work on the SMS implementation.  Somehow
> we have a number of known bugs:
> * inconsistent/incompatible/incorrect handling of transaction ID's
> * interleaved 04.11 CP-DATA transfers if a phone sends a multi-part
>  message or multiple SMS at the same time.  If you do this right now,
>  we will use one full cycle of channel request -> immediate assignment
>  -> establish indication -> cm service request -> cm service ack and
>  then the full CP and RP transfers for each part of the message.  However,
>  the phones use the MMS (more messages to send) and overlapped /
> interleaved
>  CP-DATA transfers in order to do all of this in one go, in one RR
> connection.
>  We need to support this.
>

Ok, after sending a couple of big messages I see what you mean.
I don't get multiple RR connections but I get multiple CM service requests
one after another in a single RR connection.

Looking into it ...

   Sylvain
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