How to analyse attach issue for BG96

Hi support.
I bought BG96 evaluation kit (below), and I’m trying to attach to network in category M1 mode.
https://www.top-electronicsusa.com/quectel-bg96-gg-starter-kit-complete-initial-evaluation-kit-for-bg96-gg-ltem1-module-p-17741.html

Now, I use open air interface(OAI) BTS in category M1 mode (FDD band13 BW10MHz).
BG96 finds plmn “00101” , but BG96 can’t attach to the OAI network.
It seems that BG96 has already got system information1 and 2.
But, BG96 don’t start sending RACH to the network.
I also tried to set manual plmn selection by sending " AT+COPS=1,2,“00101” ",
but it turned out to receive error response. And, it also didn’t go well when I sent
" AT+COPS=0 " (auto plmn selection).

I have checked my SIM card by attaching LTE UE to OAI LTE mode BTS and
same EPC as I use for category M1 testing.

Please give me some advice If you have any idea to analyse this situation.

AT command detail
///////////////////////////////////////////////////////////////////////
AT+QCFG=“band”,0,1000,0

OK
AT+QCFG=“band”,0,400A0E189F,0

OK
AT+QCFG=“iotopmode”

+QCFG: “iotopmode”,0

OK
AT+QCFG=“nwscanmode”,3

OK
AT+QCFG=“nwscanseq”

+QCFG: “nwscanseq”,020301

OK
AT+QCFG=“roamservice”,1

OK
AT+QCFG=“servicedomain”,1

OK
AT+CGREG?

+CGREG: 0,4

OK
AT+CGDCONT=1,“IP”,“oai”

OK
AT+QICSGP=1,1,“oai”

OK
AT+COPS=?

+COPS: (1,“Test PLMN 1-1”,“Test1-1”,“00101”,8),(0,1,2,3,4),(0,1,2)

OK
AT+COPS=1,2,“00101”

+CME ERROR: 30
AT+COPS=1,2,“00101”

+CME ERROR: 30
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Just an idea, try to set APN with IPV4V6 in second parameter.
AT+CGDCONT=1,“IPV4V6”,“oai”
And are you sure that the same APN is used for LTM too?

Hi yamaguchi ,

pls send the below cmd ,give us more info:

at+cereg?;+cgreg?;+cops?;+qcsq;+qnwinfo

AT+QMBNCFG=“DEACTIVATE”

AT+QMBNCFG=“autosel”,0

reboot module, then try these command again:

AT+CGDCONT?

AT+CGCONTRDP

AT+COPS?

AT+CIMI

AT+QCSQ

AT+QMBNCFG="LIST‘

Hi stephen

please check result below.

I tried this under the condition that enodeb sent system information, but
didn’t start rach procedure. Once rach procedure started, it goes to RACH Msg4
and get BG96 halted and BG96 became impossible to receive and respond to AT commands.

AT+cereg?

+CEREG: 0,2

OK
AT+cgreg?

+CGREG: 0,4

OK
AT+cops?

+COPS: 0

OK
AT+qcsq?

+QCSQ: 0

OK
AT+qnwinfo

+QNWINFO: “CAT-M1”,“101”,“LTE BAND 39”,38300

OK
AT+QMBNCFG=“DEACTIVATE”

OK
AT+QMBNCFG=“autosel”,0

OK

AT+CGDCONT?

+CGDCONT: 1,“IP”,“vzwinternet”,“0.0.0.0”,0,0,0,0

OK
AT+CGCONTRDP

OK
AT+COPS?

+COPS: 0

OK
AT+CIMI

001010123456494

OK
AT+QCSQ

+QCSQ: “CAT-M1”,-65,-85,250,-6

OK
AT+QMBNCFG=“LIST”

+QMBNCFG: “List”,0,0,0,“Att_Non_Volte_Lab”,0x05010310,201712191
+QMBNCFG: “List”,1,0,0,“China_Common”,0x05802800,201806231
+QMBNCFG: “List”,2,0,0,“Telstra-Commercial”,0x05801801,201806301
+QMBNCFG: “List”,3,0,0,“ROW_Commercial”,0x05800801,201806301
+QMBNCFG: “List”,4,0,0,“Verizon_Commercial”,0x05803801,201806301
+QMBNCFG: “List”,5,0,0,“SKT_Tx2.0”,0x05804800,201812191

OK

thanks!

Hi yamaguchi ,

based on you info , your APN set is vzwinternet.

Pls change it as below:

AT+CGDCONT=1,“IPV4V6”,“oai”

Hi stephen

Sorry, this thread is old.
Currently, I don’t use OAI.
I got result with our enodeb.
I won’t try OAI, so, it’s ok to close this thread.

thanks.

ok , thanks for your feed back ,we will close this thread .