OpenBSC GPRS Question

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Sergey V. Efimov risky at mail.ru
Wed Aug 14 15:42:30 UTC 2013


Hello All,

Tried to setup Osmo-NITB + OsmoSGSN + GGSN installation using sysmoBTS station.
To connect to the network I use custom SIM card programmed with appropriate MCC and MNC.
That is what I get:

osmo-nitb log:
====================
<0005> abis_nm.c:2414 OC=GPRS-CELL(f1) INST=(00,00,ff) IPACCESS(0xf6): SET ATTR ACK
<0005> abis_nm.c:2414 OC=GPRS-NSVC(f2) INST=(00,00,ff) IPACCESS(0xf6): SET ATTR ACK
<0004> abis_rsl.c:1431 (bts=0,trx=0,ts=0,ss=0) Activating ARFCN(666) SS(0) lctype SDCCH r=LOCATION_UPDATE ra=0x0f ta=0
<0004> abis_rsl.c:1165 (bts=0,trx=0,ts=0,ss=0) CHANNEL ACTIVATE ACK
<0000> abis_rsl.c:1621 (bts=0,trx=0,ts=0,ss=0) SAPI=0 ESTABLISH INDICATION
<0002> gsm_04_08.c:1055 LOCATION UPDATING REQUEST: mi_type=0x01 MI(250770000002339) type=NORMAL
<0001> gsm_04_08.c:119 (bts 0 trx 0 ts 0 pd 05) Sending 0x18 to MS.
<0000> abis_rsl.c:1621 (bts=0,trx=0,ts=0,ss=0) SAPI=0 DATA INDICATION
<0003> bsc_api.c:479 CLASSMARK CHANGE CM2(len=3) CM3(len=9)
<0000> abis_rsl.c:1621 (bts=0,trx=0,ts=0,ss=0) SAPI=0 DATA INDICATION
<0002> gsm_04_08.c:462 IDENTITY RESPONSE: mi_type=0x02 MI(358279013039780)
<0002> gsm_04_08.c:426 -> LOCATION UPDATE ACCEPT
<0001> gsm_04_08.c:119 (bts 0 trx 0 ts 0 pd 05) Sending 0x02 to MS.
<0002> gsm_04_08.c:768 -> MM INFO
<0001> gsm_04_08.c:119 (bts 0 trx 0 ts 0 pd 05) Sending 0x32 to MS.
<0002> gsm_subscriber.c:361 Subscriber 250770000002339 ATTACHED LAC=1
<0000> abis_rsl.c:1621 (bts=0,trx=0,ts=0,ss=0) SAPI=0 DATA INDICATION
<0002> gsm_04_08.c:1071 TMSI Reallocation Completed. Subscriber: 250770000002339
<0000> chan_alloc.c:405 (bts=0,trx=0,ts=0,ss=0) starting release sequence
<0003> gsm_04_08_utils.c:231 Sending Channel Release: Chan: Number: 0 Type: 1
<0004> abis_rsl.c:633 (bts=0,trx=0,ts=0,ss=0) DEACTivate SACCH CMD
<0000> abis_rsl.c:1621 (bts=0,trx=0,ts=0,ss=0) SAPI=0 RELEASE INDICATION
<0004> abis_rsl.c:679 (bts=0,trx=0,ts=0,ss=0) RF Channel Release CMD due error 0
<0004> abis_rsl.c:731 (bts=0,trx=0,ts=0,ss=0) RF CHANNEL RELEASE ACK
=====================

Thus, I see that GPRS attributes were set successfully and the subscriber was granted access to the network.
Then, I look into osmo-sgsn log:

=====================
<0010> gprs_ns.c:679 NSEI=101 Rx NS RESET (NSVCI=101, cause=O&M intervention)
<0010> gprs_ns.c:538 NSEI=101 Tx NS RESET ACK (NSVCI=101)
<0010> gprs_ns.c:679 NSEI=101 Rx NS RESET (NSVCI=101, cause=PDU not compatible with protocol state)
<0010> gprs_ns.c:538 NSEI=101 Tx NS RESET ACK (NSVCI=101)
<0010> gprs_ns.c:865 NSEI=101 Rx NS UNBLOCK
<0010> gprs_ns.c:865 NSEI=101 Rx NS UNBLOCK
<0011> gprs_bssgp.c:1000 NSEI=101/BVCI=2 Rejecting PDU type 1 for unknown BVCI
<0011> gprs_bssgp_util.c:103 BSSGP BVCI=0 Tx STATUS, cause=Unknown BVCI
<0011> gprs_bssgp.c:1000 NSEI=101/BVCI=2 Rejecting PDU type 1 for unknown BVCI
<0011> gprs_bssgp_util.c:103 BSSGP BVCI=0 Tx STATUS, cause=Unknown BVCI
=====================

So, PDU is rejected and I don't see any GPRS availability on a phone.

Has anybody ever seen this message?

Regards,
Sergey.





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