Re: [Openbts-discuss] [Discuss-gnuradio] Software mobile phone

[Joshua L. <jl...@th...>]

And leveraging the work from the osmocombb project
(http://bb.osmocom.org/trac/) will get you a far ways towards the goal.


Quoting John Gilmore (gn...@to...):
> > Dear All,
> > 
> > Do we think it is possible to create a software mobile phone using the  
> > USRP, with the OpenBTS code or something else?
> > 
> > I mean everything would be in software, plus the USRP....?
> 
> It is absolutely possible.  So far I don't know anyone who has
> tried to do it.  The OpenBTS code would give you a big head start.
> 
> I also think it would be interesting to port the resulting code into a
> mobile phone.  Generally the GSM protocols in a phone are run in a
> "baseband processor" separate from the user interface processor.
> Every phone I know of uses secret, proprietary code running in the
> baseband processor, even when the user interface is largely free
> software.  Once you had working code running in GNU Radio on a Linux
> machine, the challenge would be finding a well-documented baseband
> chip (in which the manufacturer tells you where to find the radio I/O
> gear on the chip, and how it works, etc).  Porting clean GSM code to
> run in that chip in realtime would require some adaptation to exploit
> unusual on-chip DSP hardware, mastering an embedded debugging
> environment, and perhaps shrinking the memory consumption of the GNU
> Radio-based code.
> 
> I think it's not only doable, but well worth doing.  It should be
> worth a couple of PhDs at least.  You would certainly know the GSM
> protocols inside and out by the time you were done!
> 
> 	John
> 
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