Hello,
I am running a HW / board that uses BG95 / BG96 modules (using LTE-M) for connecting to the server. It runs the same FW on the board and uses the same SIM (hologram, roaming), the same operator, at the same location. The problem I observe is as follows:
When using the BG96 module, the connection functionality works as expected. It gets connected very fast, withing 2-3 sec.
When using BG95-M3 module, it cant connect to the network. I run the connecting process for a long time (several minutes). I am getting mostly state 0 or sometimes 2 (searching) but it cant get to connect. Quite often I am getting connection denied after cca 5 mins. Then I start again and getting 0.
My initial thought was that maybe it is due to band that is available in my location and BG96 supports this band while BG95 doesnt. I checked the band used by BG96, it is B20 which is supported by both.
I checked the band setup on BG95 and it is set correctly (configuration: “band”,0xf,0x100002000000000f0e189f,0x10004200000000090e189f).
I’d like to ask you for any hints / suggestions where can be the problem / what to check.
Thanx.
Best regards,
peter
If you are using the same SIM card, I suggest you try locking the band.
Hi herbert.pan-Q,
thanx for your feedback. This is what I tried last days. I changed the band definition for BG95 just to B20. I am getting result 0 or 2 and then immediately connection denied. Now it is faster, in about 3-4 min. I checked with the operator if they can see the SIM getting through RAN to Core. It doesnt get through. If I use the same SIM with BG96, it works perfectly and I am connected within few seconds.
I also checked and compared some parameters of BG96 and BG95 and they are identical:
“nwscanmode”,0
“nwscanseq”,020301
“iotopmode”,2
No clue.
Best regards,
peter
I am also very confused. Maybe you need to capture the debug log for analysis.
Hi herbert.pan-Q,
do you mean the UART communication between modem and the host?
Best regards,
peter
No, you need to capture the modem log through the USB DM port.
Hello,
the difference was finally identified in the service mode (AT+QCSQ). While BG96 names the CAT-M1 mode as “CAT-M1”, the BG95 names it “eMTC”.
Thank you, Herbert.pan-Q for your support.
Best regards,
peter
Haha, yes, eMTC and CATM are the same.