RM502Q-AE Stuck on LIMSRV

IoT Modules 5G Module
1

My module seems to be stuck on LIMSRV and will not register with the network. How might I go about troubleshooting this?

AT+QENG="servingcell"                                                                                                                                                                                       
+QENG: "servingcell","LIMSRV","NR5G-SA","FDD", 310,260,104F54003,96,A9FE00,126270,71,1,-97,-13,7,0,2175
2

Dear @wiggle
Sorry for the late. Did you solve it now?

3

Hi Silvia,

We do have same issue with our own gNB solution.
The module RM502Q-AE just can’t finish the RACH procedure to complete the registration.

From our gNB’s log, the UE fails to complete the msg4 (maybe the RRCSetupComplete is not reaching to gNB).

How do we find the details form RM502Q-AE? Any debugging tools to reveal more details?

4

Here is what we got:

at+cops=1,2,"00101",12
+CME ERROR: 30
at+cops=?
+COPS: (1,"Test PLMN 1-1","Test1-1","00101",12)
OK
AT+QENG="servingcell"
+QENG: "servingcell","LIMSRV","NR5G-SA","TDD",001,01,000000001,1,1,637536,78,3,-58,-11,26,1,62
OK
AT+QENG="servingcell"
+QENG: "servingcell","LIMSRV","NR5G-SA","TDD",001,01,000000001,1,1,637536,79,12,-59,-11,15,1,61
5

Hi,
Try to disable automatic MBN selection.
If module can’t found commercial operator per SIM card, it automatically choose ROW (rest of the world) settings. These settings doesn’t works with us.
So, try:
at+qmbncfg=“Autosel”,0
at+qmbncfg=“deactivate”

Restart the modem, and check with command:
at+qmbncfg=“list”
that no one mbn is selected (have all with “,0,0”) data

In one case this help us, but it also can be many others reasons, like this one:

Thanks,
Dmitry