[Openbts-discuss] Passive Decoder for UMTS (and / or GSM)

[Alastair D. <ADa...@ki...>]

I want to build a passive (rx-only) scanner to listen to GSM and UMTS traffic. I am not interested in breaking encryption or anything like that - but more interested in collecting statistics and such.

Things like numbers of RACH bursts. Number of active calls on a cell/frequency/channel.

I have got OpenBTS up and running and am working on OpenBTS-UMTS. These are great, but the appear to be only intended to emulate and Basestation/ENodeB. I am looking for something a bit more generic - which can just analyse channels (e.g. in GSM scan all the common control channels and look for RACH bursts and assignment commands).

Is there anything like this out there? - Or can OpenBTS/OpenBTS-UMTS be made to do this? I guess I can modify the software, but that is quite a large task I would imagine. Any got any hints/tips?

BTW: I have an Ettus USRP B210.

Thanks : )

Alastair  Dadachanji
Contract Software Engineer
Tel:  +44 (0) 1989 568350
     
  
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