Hello,
I’m trying to attach to NB-IoT network with BC95-G. but, after in RX time = 87s, for short time, connect to network (get +CSCON:1 and immediately become +CSCON:0) and then disconnect. I check with AT+NUESTATS also, for 2 second only connect to network. you think what is problem?
hi,Leila_Ghanbari
Please upload your URAT port log
AT+NBAND=3
OK
AT+CFUN=1
+CEREG:0,0000,00000000,9,
OK
AT+CGATT=1
OK
+CEREG:2,0000,00000000,9,
AT+NUESTATS
Signal power:-32768
Total power:-32768
TX power:-32768
TX time:0
RX time:8858
Cell ID:4294967295
ECL:255
SNR:-32768
EARFCN:4294967295
PCI:65535
RSRQ:-32768
OPERATOR MODE:0
CURRENT BAND:255
OK
+CSCON:1
AT+NUESTATS
Signal power:-32768
Total power:-32768
TX power:230
TX time:580
RX time:89238
Cell ID:43829033
ECL:2
SNR:-32768
EARFCN:4294967295
PCI:65535
RSRQ:-32768
OPERATOR MODE:2
CURRENT BAND:3
+CSCON:0
OK
AT+NUESTATS
Signal power:-32768
Total power:-32768
TX power:-32768
TX time:0
RX time:1308
Cell ID:4294967295
ECL:255
SNR:-32768
EARFCN:4294967295
PCI:65535
RSRQ:-32768
OPERATOR MODE:0
CURRENT BAND:255
OK
+CSCON:1
AT+NUESTATS
Signal power:-1279
Total power:-1126
TX power:230
TX time:579
RX time:91155
Cell ID:43829033
ECL:2
SNR:-35
EARFCN:1790
PCI:19
RSRQ:-160
OPERATOR MODE:2
CURRENT BAND:3
OK
+CSCON:0
hi,Leila_Ghanbari
Signal power:-1279
Total power:-1126
ECL:2
SNR:-35
According to the above signal reference, the signal of the terminal receiving the base station is very weak.I suggest you check the antenna on the terminal or set it up outside.Also you should be able to add time stamps in URAT logs.
[2022-01-24_15:35:07:772]AT+NBAND=3
[2022-01-24_15:35:07:772]OK
[2022-01-24_15:35:09:975]AT+CFUN=1
[2022-01-24_15:35:10:209]+CEREG:0,0000,00000000,9,
[2022-01-24_15:35:12:334]
[2022-01-24_15:35:12:334]OK
[2022-01-24_15:35:14:114]AT+CGATT=1
[2022-01-24_15:35:14:114]OK
[2022-01-24_15:35:14:271]
[2022-01-24_15:35:14:271]+CEREG:2,0000,00000000,9,
[2022-01-24_15:36:49:186]OK
[2022-01-24_15:36:50:123]AT+NUESTATS
[2022-01-24_15:36:50:123]Signal power:-852
[2022-01-24_15:36:50:123]Total power:-743
[2022-01-24_15:36:50:123]TX power:210
[2022-01-24_15:36:50:123]TX time:14
[2022-01-24_15:36:50:123]RX time:88768
[2022-01-24_15:36:50:123]Cell ID:43829033
[2022-01-24_15:36:50:123]ECL:0
[2022-01-24_15:36:50:123]SNR:165
[2022-01-24_15:36:50:123]EARFCN:1790
[2022-01-24_15:36:50:123]PCI:19
[2022-01-24_15:36:50:123]RSRQ:-108
[2022-01-24_15:36:50:123]OPERATOR MODE:2
[2022-01-24_15:36:50:123]CURRENT BAND:3
[2022-01-24_15:36:50:123]OK
[2022-01-24_15:36:50:232]
[2022-01-24_15:36:50:232]+CSCON:1
[2022-01-24_15:36:50:404]
[2022-01-24_15:36:50:404]+CSCON:0
Thanks for your reply, I’m near the base station, what are the normal values for signal power that BC95-G works?
OK, I think the terminal should register network failure, you can check through the following command:
AT+CEREG?
CSCON:1 then CSCON:0, indicating that the terminal has established an RRC connection to the radio network, but the connection to the core network may be rejected
The connection rejected by Network? why this happen?
The SIM card may be overdue, data services are not enabled, or the terminal is bound to the SIM card
The network operator says that your information of the module (BC95-G) is not complete when register. This causes that the network rejects the connection. This is true? I have any controls on the information that module send to network when registering (with AT command)? Thanks in advance
at+cgatt=1 //Register the radio network
You can use UEmonitor to grab logs for analysis,using the Debug port
UEmonitor