Thank you for your reply Eric. I asked this question in gnu radio mailing list because may be the problem is the hardware.
I could see there was a problem with the synchronization. Sometimes, some gsm messages are missed due to a synchronization lost. Besides, i think it can be enhanced by software. Do you think the hardware (USRP) is not the problem? Thanks. Cheers, Jose 2009/5/13 Eric Blossom <e...@comsec.com> > On Wed, May 13, 2009 at 12:31:23PM +0200, José Carlos Reyes wrote: > > Hi all, > > > > I would like to ask you a basic question. > > I receive the BCCH and CCCH (PCH and AGCH) GSM channels with gsm-tvoid > and > > gsmdecode. I use USRP. For instance, to do that, I type something like: > > > > ./gsm_scan.py -p d -r e -c 104 | ../../../gsmdecode/src/gsmdecode -i > > > myfile.txt > > > > The problem is that a lot of messages are missed. While I am receiving I > can > > see warning messages like the followings: > > > > sch.c:254 ERR: conv_decode 7 > > gsmstack.c:162 cannot decode fnr=0x002921c8 ts=0 > > gsmstack.c:162 cannot decode fnr=0x002921ce ts=0 > > gsmstack.c:162 cannot decode fnr=0x002921e2 ts=0 > > gsmstack.c:162 cannot decode fnr=0x002921ed ts=0 > > gsmstack.c:162 cannot decode fnr=0x002921f1 ts=0 > > .... > > ... > > sch.c:254 ERR: conv_decode 7 > > gsmstack.c:162 cannot decode fnr=0x00292229 ts=0 > > sch.c:254 ERR: conv_decode 1 > > .... > > > > The BTS (Base Station) from I am receiving is really near my USRP. > > What Could I do to solve this? Any Suggestion? > > > > Thanks in advance for your time. > > Cheers > > > > Jose > > Jose, > > The airprobe list is most likely a better place to ask this question. > AFAIK the people who wrote gsm_scan.py are not on this list, or if > they are they have been very quiet. > > Eric >
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