[Openbts-discuss] Problem with OpenBTS on USRP B210

[Simon P. <sim...@st...>]

Hi, I'm trying to set up OpenBTS on an USRP B210 with installed GPSDO and
have run into the following problems:

1. It is impossible to connect to the network with Android phones

2. The quality of service when making a call with an Iphone is really bad

3. The range at which it is possible to make a call is maximum 30 meters,
even with maximum power

4. The measured timing error on the channel is always at least -1 bit period

5. The measured timing error seem to be drifting, resulting in a saw tooth
like graph. The deviations between the top and the bottom of the saw tooth
pattern usually about 0.4 bit periods.

6. The system seem generally unstable and many results are inconsistent

So far I have installed a GPSDO to get a better clock, but without any
improvement on the OpenBTS network. The GPS lock indicator is illuminated
and everything seems fine when I query the GPSDO.


It would be really nice to get an expert opinion on what might be the
problem. And if some of these phenomenons are to be expected and simply
reflects the performance of the system.

Sorry if it seems like I'm spamming the mail-list but I have already spent
way to much time on getting this to work


I have heard that the problem could be that the current version of UHD is
ahead of OpenBTS in the development and thus some changes has not been
compensated for in OpenBTS. If this is the case, do anyone know a
combination of UHD and OpenBTS versions that is confirmed to work together?


Thanks for any help
/Simon