EM12 ambiguous serving cell information

IoT Modules LTE-A Module
1

Hello

we are getting all status information for network, provider or signal by AT commands. We are using uqmi to establish the connection and register to the network. EM12 firmware version: EM12GPAR01A19M4G

We have noticed that on handover from LTE to WCDMA we might loose the serving-cell information. The serving-cell stays in state SEARCH forever, but the network information QNWINFO returns the correct signal type.

// connected to LTE
AT +QENG="servingcell"
+QENG: "servingcell","NOCONN","LTE","FDD",228,03,3AAC15,146,6400,20,3,3,2712,-118,-11,-92,13,255,70,-

// handover to WCDMA because of bad signal levels
AT+QENG="servingcell"
+QENG: "servingcell","SEARCH"

AT+QNWINFO
+QNWINFO: "WCDMA","000","WCDMA 900",2938

The uqmi signal-info uqmi -d /dev/cdc-wdm0 --get-signal-info returns the correct signal type as well, the network connection is established and the internet is reachable.

Is this a bug in the firmware? Should we rather rely on the uqmi output?

2

Dear MrFish
Thanks for your inquiry in Quectel forum. glad to help you.
For your problem, need deep check the related LOG to dig out the information between module and network. If you can sent the log to support@quectel.com.
In order to better analyze the problem, may I know the following information
Company name and location / project application / project timeline / From which channel you got Quectel EM12,

3

Thank you Jeffry, which kind of log are you looking for?
Is there a way to enable debug log reporting on the EM12?

4

Dear MrFish
QXDM log will be OK, please enable debug log by AT+QCFG=“DBGCTL”,0 ,thanks
I still hope you can provide follow information for better analyze, thanks
Company name and location / project application / project timeline / From which channel you got Quectel EM12