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Alexander Chemeris alexander.chemeris at gmail.comCsaba, We use UmTRX routinely to develop GPRS code for OpenBSC and it works well. I can't say much about other SDR equipment, but we have some timing related bugs with USRP1 based devices of one of our customers. Regarding the official OpenBTS GPRS code - we've never tried to run it, but looking into the code, it lacks quite a few features the OpenBSC implementation has. On Fri, Jan 24, 2014 at 1:01 AM, Sipos Csaba <dchardware at gmail.com> wrote: > Thanks for the info! > > > At least now I know, that the GPRS/EDGE is part of the OpenBTS code, so > any hardware is OK for packet data which can run OpenBTS. That is good news. > > > Anyway, it is just an educated guess, but don't you think your problem > with GPRS is related to timing? My experience with real life networks > clearly shows that even a slight timing related problem or inaccuracy can > led to something like that. > > > My other experience is with R&S CMW500, which I used with a little > external antenna and encountered the same problem. After a few meters even > the voice calls started to drop with -60 RSSI. The reason was obvious: the > device lacks any filters on the input chain (it is designed for production > mode), and when all the received RF energy hits the receiver from all the > bands, it causes problems like that. And the packet data was way more > sensitive to this than voice calls. After installing proper filters, the > problem is gone. > > > BR, > > Csaba > > > > OpenBTS supports GPRS, but at least for me it does not work very > reliably, I consider this only a proof of concept. While voice/SMS range is > up to 200m, GPRS breaks down after 5m (!) distance, and the connection > stalls after a while, requiring a restart of OpenBTS. I am using an USRP1 > with WBX board. > > > > Ralph. > -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/openbsc/attachments/20140124/cc11209a/attachment.htm>