[Openbts-discuss] Still has problem afterall RE: OpenBTS often can't be found

[Joe M <jm...@gm...>]

On my previous email I thought this problem has gone after changing the
band and ARFCN, but the network sometimes would be visible and able to
connect but will disconnected after a minute or so. And sometimes not
visible at all.

Anyway I live in New Zealand and I set openbts config to the following:
GSM.Radio.Band 1900
GSM.Radio.C0 761
I believe it's an unused one.

My antenna are small antenna 5cm long (sorry don't know whats the model
number)

Im testing this just in a small closed room.
Noise would range from -58-70
Rssi target -50, With rxgain 47

Thanks for any help

Regards,
Joe
On Feb 4, 2016 10:15 PM, "Ralph A. Schmid, dk5ras" <ra...@sc...> wrote:

Can you ensure that your frequency (your ARFCN) is free in your area? And
what about antennae and diplexer, what exactly are you using?



Ralph.



*From:* Joe M [mailto:jm...@gm...]
*Sent:* Thursday, February 4, 2016 10:10 AM
*To:* Tom Tsou
*Cc:* OpenBTS Discuss
*Subject:* Re: [Openbts-discuss] OpenBTS often can't be found



Hi Tom and all,

as a mentioned sometimes my openbts is visible sometimes doesn't. sometimes
it can connect.

rarely I was able to sendsms and sendsimple. so it's not so stable.



here's my OpenBTS outputs. as you can see I was able to connect one MS but
the noise went up in few secs and I can't sendsms or sendsimple to the MS.



thanks for any inputs.



cheers



--------

root@usrp-e1xx:~/src/openbts/openbts/trunk/apps# ./OpenBTS

ALERT 1074962432 OpenBTS.cpp:148:main: OpenBTS starting, ver P2.8TRUNK
build date Jan 13 2016

1454576443.787932 1074962432:



OpenBTS

Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc.

Copyright 2010 Kestrel Signal Processing, Inc.

Copyright 2011 Range Networks, Inc.

Release P2.8TRUNK formal build date Jan 13 2016

"OpenBTS" is a trademark of Range Networks, Inc.



1454576443.807860 1074962432:

Starting the system...

linux; GNU C++ version 4.5.3 20110311 (prerelease); Boost_104500;
UHD_003.004.000-unknown



1454576452.274627 1074962432:



Welcome to OpenBTS.  Type "help" to see available commands.



OpenBTS> noise

noise RSSI is -57 dB wrt full scale

MS RSSI target is -50 dB wrt full scale



OpenBTS> rxgain

current RX gain is 46 dB



OpenBTS> tmsis

TMSI       IMSI            age  used

       3 530240106064850   38s   38s



OpenBTS>noise

noise RSSI is -67 dB wrt full scale

MS RSSI target is -50 dB wrt full scale



--------------



I believe im running on 900Mhz here's my uhd_usrp_probe
http://pastebin.com/huf4qHgm





On Fri, Jan 22, 2016 at 8:21 AM, Tom Tsou <tom...@et...> wrote:

On Tue, Jan 19, 2016 at 9:24 PM, Joe M <jm...@gm...> wrote:
> Oh I want to add also to my previous email,
> When it visible, sometimes I can connect and get the welcome sms along the
> IMSI. I can see the IMSI from OpenBTS> tmsis command. But, when I tried to
> sendsms or sendsimple the message won't get thru even thou OpenBTS didn't
> say any error or problem.

What device are you running on?

Typically if the issue is seeing the network, as opposed to attaching
to the network, then frequency offset may be suspect. The frequency
offset issue is exasperated if there are other networks around versus
operating OpenBTS in isolation.

  -TT