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Max msuraev at sysmocom.deOk, with sudo chrt 15 ./src/osmo-bts-trx/osmo-bts-trx -t 2 -c ~/.config/osmocom/osmo-bts-mtrx.cfg -d DRTP:DCC:DRSL:DL1C it starts but phone fails to see the network - openbsc gives following error: <0004> bsc_init.c:287 bootstrapping RSL for BTS/TRX (0/0) on ARFCN 878 using MCC=1 MNC=64 LAC=1 CID=0 BSIC=63 <001d> input/ipa.c:265 accept()ed new link from 192.168.122.1 to port 3003 <0004> bsc_init.c:287 bootstrapping RSL for BTS/TRX (0/1) on ARFCN 880 using MCC=1 MNC=64 LAC=1 CID=0 BSIC=63 <0000> abis_rsl.c:1835 (bts=0,trx=1,ts=0,ss=0) ERROR INDICATION cause=SABM frame with information not allowed in this state in state=ACTIVE <0002> gsm_04_08.c:472 Subscriber 1640000005666: LOCATION UPDATING REJECT LAC=1 BTS=0 <0002> gsm_subscriber.c:309 Subscriber 1640000005666 ATTACHED LAC=1 <001d> input/ipaccess.c:277 Bad signalling message,sign_link returned error <001d> input/ipaccess.c:277 Bad signalling message,sign_link returned error <0000> abis_rsl.c:1835 (bts=0,trx=1,ts=0,ss=0) ERROR INDICATION cause=Timer T200 expired (N200+1) times in state=RELEASE REQUESTED Could you share which versions/branches have you used in your tests? Also could elaborate on '-m' - what's this option for and when it's necessary? How it's support to affect osmo-bts configuration? On 08/02/2016 12:39 AM, Tom Tsou wrote: > Hi Max, > > On Mon, Aug 1, 2016 at 7:57 AM, Max <msuraev at sysmocom.de> wrote: >> I've asked about it before but this seems to have been lost in >> communication. > I do not recall this discussion. My apologies. > >> The question is basically how to enable multi-TRX support for >> osmo-bts-trx using phy/instance infrastructure similar to other bts? > I use the following configuration. > > phy 0 > instance 0 > instance 1 > osmotrx rx-gain 25 > > bts 0 > band 900 > ipa unit-id 1234 0 > oml remote-ip 127.0.0.1 > settsc > gsmtap-sapi ccch > gsmtap-sapi pdtch > trx 0 > phy 0 instance 0 > trx 1 > phy 0 instance 1 > > $ osmo-bts-trx -c osmo-bts.cfg -t 2 > >> In short, I'd like to configure OpenBSC with 1 BTS with 2 TRX, each with >> its own arfcn and set of channels. I'm running "osmo-bts-trx -t 2" and >> correspondingly "osmo-trx -c 2" on usrp b210. Any ideas on what's >> missing to make this actually work are greatly appreciated. > You can use "osmo-trx -c 2" or "osmo-trx -m -c 2" to use dual-channels > of the B210 or multi-ARFCN on one channel respectively. > > Note that there are ARFCN restrictions for both cases. Due to a shared > local oscillator for both B210 channels, ARFCN separation can be up > about 25 MHz. > > With multi-TRX, ARFCN spacing is fixed at 800 kHz or 4 GSM channels. > So if TRX-0 is set to ARFCN 51, TRX-1 _must_ be set to 55. Up to three > ARFCN's is supported for multi-TRX. > > -TT -- Max Suraev <msuraev at sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Director: Harald Welte