Complete setup with just simulation

[Harald Welte]

Hi Priyanka,

On Tue, Jul 09, 2013 at 02:31:19PM +0800, Priyanka Behl wrote:
> I have to setup a complete call with voice support and also a complete
> working GPRS network with just simulation and no physical base
> station, is it achievable?  It would be great if someone could
> enlighten me on this.

Of course it is achievable - it primarily depends on how much
development effort you are capable / willing to do as part of the task,
and particularly how close to the real world you need to be.

For the GSM (voice/sms/ussd/...) side, connecting OsmocomBB with
Osmo-BTS has been suggested several times.  Instead of sending the
messages over a real L1, you could send them over GSMTAP.  Different
ARFCN/timeslot/etc. can be encoded in the GSMTAP header, and you have
nice debugging by the GSMTAP dissector in wireshark.

I would guess that this can be done by a skilled developer in one week.

For GPRS, a similar approach can be used.  but: there is no MS-side
implementation at all.  You may be able to reuse higher layers like
SNDCP and LLC from OsmoSGSN, as well as RLC/MAC message encoding and
parsing from osmo-pcu. but you will definitely have to implement the
full MS-side GPRS stack, mostly from scratch.  We're talking about
something in the oder of (few) months of development time.

Regards,
	Harald
-- 
- Harald Welte <laforge at gnumonks.org>           http://laforge.gnumonks.org/
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