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nRF9160 don't see the NB-IoT networks

Vladimir Aparin

I alredy run the assert tracking about 4 months ago on preliminary firmware.

Now I updated the modem firmware to v1.0.0 and compiled the last stable AT Client project from repositary.

Now I can't see any networks at all (AT+COPS=? shown nothing) and as resul i can connect and register anywhere.
At the same time the network is present and the SIM is working - uBlox SARA-R410 on the same table working fine.

I tried some samples from the repositary and got the same result - the nRF9160 can't connect to the network!

What's may going wrong? How to fix it.

  • 0 in reply to Vladimir Aparin

    Ok, attachment to a network isn't likely happen that quickly. I have seen the attachment take several minutes in poor reception areas. You need to give the module at least a minute before testing if it has made a connection. It is not necessary to read the status of CFUN, CFUN must be set to 1 in order for the modem to activate but you do not need to read the status of CFUN for the modem to attach. I wouldn't worry too much about band selection, this should be automatic as the device will default to scanning all LTE bands.

    An additioanl question, are you testing this inside a building or in the open air, away from structures? From my own personal testing with the pca10090 DK, the reception will be quite low inside a structure, usually lower than -110dBm

  • +1 in reply to MJD093

    After i configured bands, Nb-IoT mode, powered the modem and start the registration all works now:

    ***** Booting Zephyr OS v1.14.99-ncs2 *****
The AT host sample started
AT+CFUN?
+CFUN: 4
OK
AT+CFUN=1
OK
AT+CFUN?
+CFUN: 1
OK
AT+CGSN=1
+CGSN: "352656100031668"
OK
AT+CGMI
Nordic Semiconductor ASA
OK
AT+CGMM
nRF9160-SICA
OK
AT+CGMR
mfw_nrf9160_1.0.0
OK
AT+CEMODE?
+CEMODE: 0
OK
AT%XCBAND=?
%XCBAND: (3,8,20)
OK
AT+CMEE?
+CMEE: 0
OK
AT+CMEE=1
OK
AT+CNEC?
+CNEC: 0
OK
AT+CNEC=24
OK
AT+CGEREP?
+CGEREP: 0,0
OK
AT+CGDCONT?
OK
AT+CGACT?
OK
AT+CGEREP=1
OK
AT+CIND=1,1,1
OK
AT+CEREG=2
OK
AT+CEREG?
+CEREG: 2,4,"FFFE","FFFFFFFF",9
OK
AT%CESQ=1
OK
AT+CESQ
+CESQ: 99,99,255,255,255,255
OK
AT%XSIM=1
OK
AT%XSIM?
%XSIM: 1
OK
AT+CPIN?
+CPIN: READY
OK
AT+CPINR="SIM PIN"
+CPINR: "SIM PIN",3
OK
AT+CIMI
250011791500068
OK
%CESQ: 34,1
+CEREG: 2,"4B6A","030E3808",9
+CGEV: ME PDN ACT 0
AT+CGDCONT?
+CEREG: 1,"4B6A","030E3808",9
+CIND: "service",1
+CGDCONT: 0,"IPV4V6","iot","10.0.44.178 0000:0000:0000:0000:0000:0002:FC39:9301",0,0
OK
AT+CGACT?
+CGACT: 0,1
OK
+CGEV: IPV6 0
AT+CGDCONT?
+CGDCONT: 0,"IPV4V6","iot","10.0.44.178 2A00:1FA0:2000:8B83:0000:0002:FC39:9301",0,0
OK
AT+CGACT?
+CGACT: 0,1
OK
%CESQ: 39,1
AT+CFUN?
+CFUN: 1
OK
AT+CGSN=1
+CGSN: "352656100031668"
OK
AT+CGMI
Nordic Semiconductor ASA
OK
AT+CGMM
nRF9160-SICA
OK
AT+CGMR
mfw_nrf9160_1.0.0
OK
AT+CEMODE?
+CEMODE: 0
OK
AT%XCBAND=?
%XCBAND: (3,8,20)
OK
AT+CMEE?
+CMEE: 1
OK
AT+CNEC?
+CNEC: 24
OK
AT+CGEREP?
+CGEREP: 1,0
OK
AT+CIND=1,1,1
OK
AT+CEREG=2
OK
AT+CEREG?
+CEREG: 2,1,"4B6A","030E3808",9
OK
AT+COPS=3,2
OK
AT+COPS?
+COPS: 0,2,"25001",9
OK
AT%XCBAND
%XCBAND: 20
OK
AT+CGDCONT?
+CGDCONT: 0,"IPV4V6","iot","10.0.44.178 2A00:1FA0:2000:8B83:0000:0002:FC39:9301",0,0
OK
AT+CGACT?
+CGACT: 0,1
OK
AT%CESQ=1
OK
AT+CESQ
+CESQ: 99,99,255,255,255,39
OK
AT%XSIM=1
OK
AT%XSIM?
%XSIM: 1
OK
AT+CPIN?
+CPIN: READY
OK
AT+CPINR="SIM PIN"
+CPINR: "SIM PIN",3
OK
AT+CIMI
250011791500068
OK

    So it's required

    AT%XBANDLOCK=1,"10000000000010000100"
AT%XSYSTEMMODE=0,1,0,0
AT+CFUN=1
AT+CEREG=2

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