osmocom with USRP1 as a sw-only MS?

Sylvain Munaut 246tnt at gmail.com
Fri Sep 3 12:09:20 UTC 2010


> With the current bb implementation of Osmocom inside Calypso based
> baseband processor of motorola, all the DSP logic is done directly by
> the mobile phones chip, right?

Yes

> Which with OpenBTS, it's OpenBTS itself that does the
> modulation/demodulation along with the USRP.

Yes,

> Is there some project and or ideas to bring together the DSP codebase of
> OpenBTS, together with OsmocomBB to make a MS terminal based on USRP1
> device with RFX900 boards?

Idea, yes sure. It's obvious that it would be useful and has been
mentioned several time.
But there is no active project AFAIK.

It's far from trivial both because openbts code is meant to be the
clock master and because there is a bunch of part that are just
missing to do the link. (essentially the whole layer1.bin of
osmocom-bb).

There aren't _that_ many active developers in the GSM projects and
they're all pretty busy. But if you either have :
 - The time and expertise to do it yourself
or
 - The budget to finance a full (or part) time developer to work on that
then by all mean go ahead.


Cheers,

    Sylvain




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