Dear Bruce, I have never used osmo-trx/uhd or related with OpenBSC but in terms of figuring out what is broken let's have a look at the different components. wait for a location update request from the MS; which never gets received, hence the BTS times out and releases the channel. Using a phone in diagnostic mode, this message appears to be sent correctly, however the BTS never receives/processes it. So OpenBSC/osmo-nitb seems to work correctly. It doesn't "ignore" a message and it is just missing. My hypothesizes that you might have time to explore: a.) osmo-trx not being able to decode the message? b.) The osmo-bts-trx is not "receiving" data from osmo-trx? c.) osmo-bts-trx not getting the LAPDm framing right? builds), as well as the sample configuration files contained with each of the master branches, but to no differing effect. transceiver chain is working correctly... my thoughts are that perhaps I've got some simple configuration set incorrectly somewhere along the way. Could you downgrade your osmo-trx and osmo-bts to the 12+ months old version? The rest should work just fine and doesn't seem to have the issue. So my bet is either osmo-bts (a year ago you must have used a branch, now the refactored master branch is used) or osmo-trx? holger

Hi That's the same that is happening with me since about two weeks, and I was unable to solve it. They told me it might be uhd problem, but I installed different uhds with the same issue. osmo-bitb shows the same error like this: <0000> chan_alloc.c:342 (bts=0,trx=0,ts=7,pchan=TCH/F) Allocating lchan=0 as TCH_F <0004> abis_rsl.c:1727 (bts=0,trx=0,ts=7,ss=0) Activating ARFCN(60) SS(0) lctype TCH_F r=EMERGENCY ra=0xab ta=3 <0004> abis_rsl.c:536 (bts=0,trx=0,ts=7,pchan=TCH/F) Tx RSL Channel Activate with act_type=INITIAL <0004> abis_rsl.c:1127 (bts=0,trx=0,ts=7,ss=0) state NONE -> ACTIVATION REQUESTED <0004> abis_rsl.c:1456 (bts=0,trx=0,ts=7,ss=0) CHANNEL ACTIVATE ACK <0004> abis_rsl.c:1127 (bts=0,trx=0,ts=7,ss=0) state ACTIVATION REQUESTED -> ACTIVE <0004> abis_rsl.c:806 (bts=0,trx=0,ts=7,ss=0) RF Channel Release CMD due error 1 <0004> abis_rsl.c:718 (bts=0,trx=0,ts=7,ss=0) DEACTivate SACCH CMD <0004> abis_rsl.c:1127 (bts=0,trx=0,ts=7,ss=0) state ACTIVE -> RELEASE DUE ERROR <0004> abis_rsl.c:863 (bts=0,trx=0,ts=7,ss=0) RF CHANNEL RELEASE ACK <0004> abis_rsl.c:767 (bts=0,trx=0,ts=7,ss=0) is back in operation. it once showed this error: <0022> control_if.c:286 Failed to parse ip access message: -5 <0000> chan_alloc.c:355 Failed to allocate SDCCH channel <0004> abis_rsl.c:1678 BTS 0 CHAN RQD: no resources for SDCCH 0x10 osmo-pcu is not working fine with me, can this help to solve the problem?, this is the output for using it with and without sudo. pi@raspberrypi:~ $ osmo-pcu -r 1 No config file: 'osmo-pcu.cfg' Using default config. <0001> osmobts_sock.cpp:227 Opening OsmoPCU L1 interface to OsmoBTS <0001> osmobts_sock.cpp:264 Failed to connect to the osmo-bts PCU socket, delaying... '/tmp/pcu_bts' <0001> osmobts_sock.cpp:227 Opening OsmoPCU L1 interface to OsmoBTS <0001> osmobts_sock.cpp:264 Failed to connect to the osmo-bts PCU socket, delaying... '/tmp/pcu_bts' ^CSignal 2 received. full talloc report on 'Osmo-PCU context' (total 1 bytes in 1 blocks) pi@raspberrypi:~ $ sudo osmo-pcu -r 1 No config file: 'osmo-pcu.cfg' Using default config. <0001> osmobts_sock.cpp:227 Opening OsmoPCU L1 interface to OsmoBTS <0001> osmobts_sock.cpp:285 osmo-bts PCU socket has been connected <0001> pcu_l1_if.cpp:357 BTS not available pi@raspberrypi:~ $ I use USRP2 , I used recently a reference clock of 10 MHz but didn't solve the issue, but it is good to know that N210 is with the same error. Another thing that my network rarely shows on the MS, but the osmo-nitb still shows the output every minute or more or when I do a mobile network search. Thanks Abdulghafar On Tue, Sep 27, 2016 at 6:50 PM, Holger Freyther &lt;holger(a)freyther.de&gt; wrote:

Hi I decided to quit with this USRP unless you have a help of which osmo-bts can be compatible and working with current osmo-nitb for USRPs. Can you suggest any help?