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Re: [Openbts-discuss] [Discuss-gnuradio] Software mobile phone
From: |
Joshua Lackey |
Subject: |
Re: [Openbts-discuss] [Discuss-gnuradio] Software mobile phone |
Date: |
Fri, 23 Jul 2010 17:26:44 -0400 |
User-agent: |
Mutt/1.4.2.2i |
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 (address@hidden):
> > 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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