I am working on an R&D setup using a BC66-TE-B (NB-IoT) module connected to a Band 5 RRH via a wired connection. While our spectrum analyzer confirm a valid constellation and signal presence of NPSS and NSSS, the UE module is unable to detect the network.4G SIM card is used and IMSI value is detected by the module.
Setup Details:
Center Frequency: 890.5 MHz.
Transmission power for Downlink signal is 20 dBm.
Current Observations:
ATI:Return
Quectel_Ltd
Quectel_BC66
Revision:BC66NBR01A07
AT+CGMI:Return
Quectel_Ltd
Quectel_BC66
Revision:MTK_2625
AT+CSQ: Returns 0,99
AT+CEREG?: Returns 5,2 (Searching)
AT+QBAND=1,5:Return Ok ,Locked to Band 5.
AT+QLOCKF=1,2615 ,Locked to DL EARFCN
AT+CSCON :Return ERROR
AT+QENG=0 :Return ERROR
AT+CFUN=1 :Return Ok
AT+QNBIOTEVENT=1:Return Ok
Alternate +CEREG: 2 and +CEREG: 0 prints are observed in QCOM.
Please provide guidance on why the module is failing to latch onto a confirmed Band 5 anchor carrier.Does the BC66 require a dedicated IoT-specific SIM, or is a standard LTE SIM compatible.
With Regards,
Keerthana