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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.

Parents Reply Children
  • 0 in reply to Vladimir Aparin

    How long after setting CFUN=1 are you calling COPS=?

    At+CEREG? is a better debug command for network attachment as it provides information on eNodeB attachment and the current state of the modem in the attachment process. Could you provide the response of that command?

  • 0 in reply to MJD093

    In 5 seconds approximatelly.

    See the log about

    ***** Booting Zephyr OS v1.14.99-ncs2 *****

The AT host sample started

AT+CFUN=1
OK

AT+CEREG?
+CEREG: 0,4,"FFFE","FFFFFFFF",7

OK

AT+CEREG=2
OK

AT+COPS=?
AT+CEREG?

  • 0 in reply to MJD093

    I see that it's required to read CFUN status and got 1 before works onward.

    I configured the bands (B3, B8, B20) but I still see the 0 (unknown) in answer.

    ***** Booting Zephyr OS v1.14.99-ncs2 *****

The AT host sample started

AT%XCBAND
%XCBAND: 0

OK

AT%XCBAND=?
%XCBAND: (1,2,3,4,5,8,12,13,14,17,18,19,20,25,26,28,66)

OK

AT%XBANDLOCK=1,"10000000000010000100"
OK

AT%XCBAND
%XCBAND: 0

OK


AT%XCBAND=?
%XCBAND: (3,8,20)

OK

AT+CFUN?
+CFUN: 4

OK

AT+CFUN=1
OK

AT+CFUN?
+CFUN: 1

OK

AT+COPS?
+COPS: 0

OK

AT+COPS?
ERROR

AT+COPS?
+COPS: 0

OK

AT+CEREG=2
OK

AT+COPS?
+COPS: 0

OK

AT+CEREG?
+CEREG: 2,2,"FFFE","FFFFFFFF",7

OK

AT+CEREG?
+CEREG: 2,2,"FFFE","FFFFFFFF",7

OK

  • 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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