problem on registering osmocombb SDR PHY setup to my virtual bts - baseband-devel

12 Aug 2024

I want to implement osmocombb SDR PHY project on USRP N210 in Dragon OS.
for this purpose i setup Yate BTS with Blade RF in ARFCN 1. i  test this bts by making
call with two phone in this network.
then i ran grgsm_scanner by USRP N210 and the log is >>

Found CCCH arfcn: 1
Dont capture immediate assignments, skip extract SDCCH/8 info and scan...
ARFCN:    1, Freq:  935.2M, CID:    10, LAC:  1000, MCC: 432, MNC:  35, Pwr: -27
  |---- Configuration: 1 CCCH, combined
  |---- Cell ARFCNs: 0
  |---- Neighbour Cells: 1, 2, 4, 6, 9, 10, 12, 14, 17, 18, 20, 22, 25, 33, 34, 35, 36,
38, 44, 46, 47, 48, 49, 50, 57, 58, 61, 63, 66, 69, 70, 71, 72, 75, 77, 78, 80, 82, 84,
90, 91, 92, 96, 97, 98, 99, 100, 101, 106, 107, 113, 115, 116, 118, 119, 121, 122

then i run grgsm_trx, trxcon and mobile with this configuration shown below

!
! OsmocomBB example configuration for mobile application
!!
!

line vty
 no login
!
gps device /dev/ttyACM0
gps baudrate default
no gps enable
!
no hide-default
!
ms 1
 layer2-socket /tmp/osmocom_l2
 sap-socket /tmp/osmocom_sap
 stick 1
 sim none
 network-selection-mode auto
 imei 000000000000000 0
 imei-fixed
 no emergency-imsi
 no sms-service-center
 no call-waiting
 no auto-answer
 no force-rekey
 no clip
 no clir
 tx-power auto
 no simulated-delay
 location-updating
 neighbour-measurement
 codec full-speed prefer
 codec half-speed
 no abbrev
 support
  sms
  a5/1
  a5/2
  p-gsm
  e-gsm
  r-gsm
  gsm-850
  dcs
  no pcs
  class-900 4
  class-850 4
  class-dcs 1
  class-pcs 1
  channel-capability sdcch+tchf+tchh
  full-speech-v1
  full-speech-v2
  half-speech-v1
  min-rxlev -60
  dsc-max 90
  no skip-max-per-band
 test-sim
  imsi 001010412345678
  ki comp128 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  no barred-access
  rplmn 001 01
! io-format ti
 no shutdown

I enter  commands

OsmocomBB> en
OsmocomBB# sim t
OsmocomBB# sim testcard 1

 in telnet.

the log for grgsm_trx is

Copyright (C) 2016-2018 by Vadim Yanitskiy &lt;axilirator(a)gmail.com&gt;
Copyright (C) 2017-2018 by Piotr Krysik &lt;ptrkrysik(a)gmail.com&gt;
License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

[i] Init UHD Radio interface (L:0.0.0.0:6702 <-> R:127.0.0.1:6802)
[INFO] [UHD] linux; GNU C++ version 11.3.0; Boost_107400; UHD_4.1.0.5-0-unknown
[INFO] [USRP2] Opening a USRP2/N-Series device...
[INFO] [USRP2] Current recv frame size: 1472 bytes
[INFO] [USRP2] Current send frame size: 1472 bytes
[i] Init CTRL interface (L:0.0.0.0:6701 <-> R:127.0.0.1:6801)
[i] Init complete
[i] Recv POWEROFF cmd
[i] Resetting transceiver
[i] Setting TA value 0
[i] Recv ECHO cmd
[i] Recv POWEROFF cmd
[i] Resetting transceiver
[i] Setting TA value 0
[i] Recv ECHO cmd
[i] Recv MEASURE cmd
[i] Recv POWEROFF cmd
[i] Resetting transceiver
[i] Setting TA value 0
[i] Recv ECHO cmd
[i] Recv SETSLOT cmd
[i] Configure timeslot filter to: tn=0
[i] Recv RXTUNE cmd
[i] Recv TXTUNE cmd
[i] Recv POWERON CMD
[i] Starting transceiver...
[i] Recv POWEROFF cmd
[i] Stopping transceiver...
[i] Recv ECHO cmd
[i] Recv SETSLOT cmd
[i] Configure timeslot filter to: drop all
.
.
.

the log for texcon is

20240812161421520 DL1C NOTICE l1ctl.c:303 FBSB timer fired for ARFCN 1                    

20240812161421520 DL1C NOTICE l1ctl.c:422 Received reset request (1)                      

20240812161421520 DSCH NOTICE sched_trx.c:191 Reset scheduler and clock counter           

20240812161421520 DSCH NOTICE sched_trx.c:237 Delete TDMA timeslot #0                     

20240812161421520 DL1C NOTICE l1ctl.c:395 Received power measurement request (GSM900: 1
-> 1)         
20240812161421521 DL1C NOTICE l1ctl.c:422 Received reset request (1)                      

20240812161421521 DSCH NOTICE sched_trx.c:191 Reset scheduler and clock counter           

20240812161421521 DL1C NOTICE l1ctl.c:338 Received FBSB request (GSM900 1)                

20240812161421521 DSCH NOTICE sched_trx.c:191 Reset scheduler and clock counter           

20240812161421521 DSCH NOTICE sched_trx.c:213 Add a new TDMA timeslot #0                  

20240812161421521 DSCH NOTICE sched_trx.c:288 (Re)configure TDMA timeslot #0 as BCCH+CCCH 

20240812161421521 DSCH NOTICE sched_trx.c:445 Activating lchan=SCH on ts=0                

20240812161421521 DSCH NOTICE sched_trx.c:445 Activating lchan=BCCH on ts=0               

20240812161421521 DSCH NOTICE sched_trx.c:445 Activating lchan=RACH on ts=0               

20240812161421521 DSCH NOTICE sched_trx.c:445 Activating lchan=CCCH on ts=0               

20240812161421606 DSCHD ERROR sched_lchan_xcch.c:99 Received bad BCCH frame (rc=-1,
ber=62/456) at fn=369446                                                                  

20240812161421611 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369435 on CCCH

20240812161421611 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369436 on CCCH

20240812161421611 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369437 on CCCH

20240812161421611 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369438 on CCCH

20240812161421611 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=456/456) at fn=369435                                                                 

20240812161421611 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369439 on CCCH

20240812161421611 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369440 on CCCH

20240812161421611 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369441 on CCCH

20240812161421611 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369442 on CCCH

20240812161421611 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=456/456) at fn=369439                                                                 

20240812161421624 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=59/456) at fn=369450                                                                  

20240812161421684 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369456 on CCCH

20240812161421684 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369457 on CCCH

20240812161421684 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369458 on CCCH

20240812161421684 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369459 on CCCH

20240812161421684 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=456/456) at fn=369456                                                                 

20240812161421684 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369460 on CCCH

20240812161421684 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369461 on CCCH

20240812161421684 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369462 on CCCH

20240812161421684 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369463 on CCCH

20240812161421684 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=456/456) at fn=369460                                                                 

20240812161421698 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=61/456) at fn=369466                                                                  

20240812161421717 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=65/456) at fn=369470                                                                  

20240812161421777 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369476 on CCCH

20240812161421777 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369477 on CCCH

20240812161421777 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369478 on CCCH

20240812161421777 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369479 on CCCH

20240812161421777 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=456/456) at fn=369476                                                                 

20240812161421777 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369480 on CCCH

20240812161421777 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369481 on CCCH

20240812161421777 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369482 on CCCH

20240812161421777 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369483 on CCCH

20240812161421777 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=456/456) at fn=369480                                                                 

20240812161421790 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=56/456) at fn=369486                                                                  

20240812161421809 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=58/456) at fn=369490                                                                  

20240812161421874 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369501 on CCCH

20240812161421874 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369502 on CCCH

20240812161421874 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369503 on CCCH

20240812161421874 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369504 on CCCH

20240812161421874 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=456/456) at fn=369501                                                                 

20240812161421887 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=62/456) at fn=369507                                                                  

20240812161421906 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=57/456) at fn=369511                                                                  

20240812161421966 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369517 on CCCH

20240812161421966 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369518 on CCCH

20240812161421966 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369519 on CCCH

20240812161421966 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369520 on CCCH

20240812161421966 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=456/456) at fn=369517                                                                 

20240812161421966 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369521 on CCCH

20240812161421966 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369522 on CCCH

20240812161421966 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369523 on CCCH

20240812161421966 DSCHD NOTICE sched_trx.c:695 Substituting lost TDMA frame 369524 on CCCH

20240812161421966 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=456/456) at fn=369521                                                                 

20240812161421980 DSCHD ERROR sched_lchan_xcch.c:99 Received bad CCCH frame (rc=-1,
ber=62/456) at fn=369527

and the log for mobile is 

<0003> gsm322.c:2919 Found signal (ARFCN 1 rxlev <=-110 (0))                     

<0003> gsm322.c:2933 Done with power scanning range.                                

<0003> gsm322.c:2793 Scanning power for sticked cell.                               

<0003> gsm322.c:2845 Found 1 frequencies.                                           

<0003> gsm322.c:2260 Scanning frequency 1 (rxlev <=-110).                        

<0003> gsm322.c:479 Sync to ARFCN=1 rxlev=<=-110 (No sysinfo yet, ccch mode NONE)

<0003> gsm322.c:2280 30 frequencies left in band 955..124                           

<000c> l1ctl.c:301 Dropping frame with 200 bit errors                               

<000c> l1ctl.c:301 Dropping frame with 61 bit errors                                

<000c> l1ctl.c:301 Dropping frame with 60 bit errors                                

<000c> l1ctl.c:301 Dropping frame with 200 bit errors                               

<000c> l1ctl.c:301 Dropping frame with 200 bit errors                               

<000c> l1ctl.c:301 Dropping frame with 63 bit errors                                

<000c> l1ctl.c:301 Dropping frame with 59 bit errors                                

<000c> l1ctl.c:301 Dropping frame with 61 bit errors                                

<000c> l1ctl.c:301 Dropping frame with 200 bit errors                               

<000c> l1ctl.c:301 Dropping frame with 200 bit errors                               

<000c> l1ctl.c:301 Dropping frame with 62 bit errors                                

<000c> l1ctl.c:301 Dropping frame with 200 bit errors                               

<000c> l1ctl.c:301 Dropping frame with 200 bit errors                               

<000c> l1ctl.c:301 Dropping frame with 62 bit errors                                

<000c> l1ctl.c:301 Dropping frame with 65 bit errors                                

<000c> l1ctl.c:301 Dropping frame with 200 bit errors                               

<000c> l1ctl.c:301 Dropping frame with 200 bit errors                               

<000c> l1ctl.c:169 FBSB RESP: result=255                                            

<0003> gsm322.c:3014 Channel sync error.                                            

<0003> gsm322.c:3019 free sysinfo ARFCN=1                                           

<0003> gsm322.c:2748 Cell selection failed, sync timeout.                           

<0003> gsm322.c:532 ARFCN  |MCC    |MNC    |LAC    |cell ID|forb.LA|prio   |min-db
|max-pwr|rx-lev    
<0003> gsm322.c:532
-------+-------+-------+-------+-------+-------+-------+-------+-------+-------   
<0003> gsm322.c:532                                                                 

<0003> gsm322.c:2136 Cell search finished without result.                           

<0003> gsm322.c:834 new state 'C6 any cell selection' -> 'C0
null'                                    
<0002> gsm322.c:3831 (ms 1) Event 'EVENT_NO_CELL_FOUND' for automatic PLMN
selection in state 'A4 wait for PLMN to appear'                                   

<0003> gsm322.c:4062 (ms 1) Event 'EVENT_NO_CELL_FOUND' for Cell selection
in state 'C0 null'         
<0003> gsm322.c:834 new state 'C0 null' -> 'C6 any cell
selection'                                    
<0003> gsm322.c:2793 Scanning power for sticked cell.                               

<0003> gsm322.c:2870 Scanning frequencies. (1..1)                                   

<0005> gsm48_mm.c:4308 (ms 1) Received 'MM_EVENT_NO_CELL_FOUND' event in
state MM IDLE, no cell available                                                          

<0005> gsm48_mm.c:4321 Message unhandled at this state.

what should i do to connect mobile to my virtual bts?

thanks.