CalypsoBTS + GPRS and SDR suggestion

Steve Markgraf steve at steve-m.de
Tue May 9 00:12:49 UTC 2017


Hi,

On 08.05.2017 23:52, Vadim Yanitskiy wrote:
> With two Calypso phones it becomes possible to serve two timeslots.
> Basically, second phone serves one TCH timeslot, but (if I am correct)
> PDCH has no fundamental differences from TCH, so its support could be
> implemented too.
>
> After a quick look at OsmoTRX source code, I can assume, that the only
> difference between TCH channel combinations (I, II and III) and PDCH
> channel combination (XIII) is a fillerModulus value. Correct me if I am
> wrong.

Actually GPRS works fine with CalypsoBTS for years. Last time I've
tested this was last year, and there was a small patch required in order
to allow a PDCH in TS1 with the 'nanoBTS', but that's it.

I've put it here:
https://steve-m.de/files/calypso_bts/

Regards,
Steve


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