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Re: [Discuss-gnuradio] GSM Handset Emulation
From: |
Alexander Chemeris |
Subject: |
Re: [Discuss-gnuradio] GSM Handset Emulation |
Date: |
Fri, 20 Nov 2009 01:11:35 +0300 |
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.