Re: [Discuss-gnuradio] GSM Handset Emulation

[Alexander Chemeris]

Hi,

On Thu, Nov 19, 2009 at 09:08, John Gilmore <address@hidden> wrote:
>> Now that there is a functional basestation available for GSM, I was
>> wondering if anyone is trying to build software for a GSM handset.  This
>> way, I could use my laptop (e.g. in a manner similar to skype) to talk with
>> folks when I don't have a GSM phone handy.
>
> It wouldn't be very convenient, since you'd have to have a USRP, plus
> antennas, dangling off your laptop.
>
> GSM "handset" software could probably use a lot of the existing low
> and medium level GSM basestation code.  Having free implementations of
> both sides of the interface would make debugging easier, too.  But
> there'd still be a lot of work involved.  You'll need a SIM card and
> some way to read it, too.

You can emulate SIM in software. No real need to have it in hardware.

>  Sounds like a fun grad-student project to me.

Hum. It should be a very skilled grad-student.

> You could skip a lot of hassle with codecs and audio I/O and such
> by first making something that would offer data service (e.g. SMS text
> messages, or Internet access) by talking to a GSM basestation.

As David Burgess suggested, GPRS is a separate huge task to implement,
because it share only small part with voice/sms services.

-- 
Regards,
Alexander Chemeris.