Re: [Openbts-discuss] Device doesn't see network at all (openbts-uhd + usrp2 + wbx)

[Thomas T. <tt...@vt...>]

2011/6/9 Љубомир Самарџић <lj...@gm...>:
> Hi everybody,
>
> As title says, I'm dealing with that problem ... :)
>
> I'm running openbts-uhd (currently head revision from git - commit:
> d186353546d29032759f17872224187b736439dc).
> The version of uhd driver is also currently fresh (commit
> e625e890f5f341e4e93bec46a5279a96523a7b24), (libuhd.so.003.001 with
> appropriate images on usrp2 as well)
>
> The problem is that the OpenBTS network is not visible at all, on any tested
> device (several Nokia phones and one HTC). Tried gsm900 and gsm1800 bands,
> several arfcns...

One of the more recent changes is the enabling of automatic transmit
gain, which formerly only existed on the 52MHz transceiver. The config
values GSM.PowerManager.MaxAttenDB and GSM.PowerManager.MinAttenDB
control the minimum and maximum transmit power respectively. The
default configuration starts at 30dB attenuation, which only provides
minimal range, but the transmit power will ramp up as time progresses.

You can view the current transmit power (attenuation) by typing
'power' at the OpenBTS prompt.

Have you tried manual network search and selection on your phone? Have
you read the phone camping page on the wiki?

http://gnuradio.org/redmine/wiki/gnuradio/OpenBTSMS_Camping

> Also, I skipped asterisk instalation completely at this point. My thoughts
> were that network should be visible no matter what happens with Asterisk.

You are correct. If your phone cannot detect the network, than you can
ignore Asterisk installation at this point.

  Thomas