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  • Case ID: 281892
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nRF 9160 DK LTE modem turn on

user112057

Hello,

I am beginner for the nRF 9160 DK I need to turn on the LTE modem. My questions are,

  1.  Will it work for any 4FF  4G LTE enabled sim?
  2.  I use 4G LTE  enabled sim but the Link monitor show result in figure below.

Do I need to update the modem firmware or change the 4FF sim card. Can nay one give guide for turn on the modem.

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  • 0

    Hi,

     Will it work for any 4FF  4G LTE enabled sim?

    The nRF9160 should work with any LTE-M or NB-IoT enabled SIM. "Normal" 4G LTE is not supported.

     I use 4G LTE  enabled sim but the Link monitor show result in figure below.

    What application are you running on the nRF9160?

    I recommend you use the at_client sample, and run the following AT commands:

    // You probably have to configure the modem to use NB-IoT
AT%XSYSTEMMODE=0,1,1,0
AT+CFUN=0

// These commands gives us usefull notifications when the modem is running
AT+CGMR
AT+CEREG=5
AT+CMEE=1
AT+CNEC=24
AT%CESQ=1

// If you are running mfw_nrf9160_1.3.0 or newer (check the output of AT+CGMR)
AT%MDMEV=1

// Finally turn on the modem
AT+CFUN=1

    After sending AT+CFUN=1, could you let the modem run for a while, and if it doesn't connect to a network send me the log (press the "open log file" button, and upload the file)?

    Best regards,

    Didrik

  • 0 in reply to user81181

    hello again,

    I tried you recommended "at_client" sample  and above noted "AT" command but modem didn't turn on. I wait at least 12 minutes. The terminal widow show only range of receivec signal qualities as in above Figure. I have attached the log file as you said. Can check it and give any recommendations. 

  • 0 in reply to user112057
    Captain CK said:
    I tried you recommended "at_client" sample  and above noted "AT" command but modem didn't turn on.

    The modem turns on, but it is not able to connect to a network. Instead, it is rejected with reject cause 15.

    2021-12-29T12:37:14.712Z DEBUG modem << +CEREG: 2,"A9F6","000AF905",9
    2021-12-29T12:37:15.484Z DEBUG modem << +CNEC_EMM: 15
    2021-12-29T12:37:15.512Z DEBUG modem << +CEREG: 2,"A9F6","000AF905",9,0,15

    Cause #15 – No suitable cells in tracking area

    This EMM cause is sent to the UE if it requests service, or if the network initiates a detach request, in a tracking area where the UE, by subscription, is not allowed to operate, but when it should find another allowed tracking area or location area in the same PLMN or an equivalent PLMN.

    This usually indicates a problem with the subscription or the network, e.g. NB-IoT is not supported.

    Captain CK said:
    Also I have another question how do I configure CAT LTE M1 configuration on nRF9160 DK, can you give any guide or recommendation on this. If there is AT commands for this add them too.

    You can use the AT%XSYSTEMMODE command:

    AT%XSYSTEMMODE=1,0,1,0 (this will also enable GPS, if you don't want/need that, change the second 1 to 0).

    You can then store the setting in modem flash with AT+CEREG=0.

    Note that the %XSYSTEMMODE command only can be used when the modem is in flight mode (+CFUN=4) or offline (+CFUN=0).

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  • 0 in reply to user112057
    Captain CK said:
    I tried you recommended "at_client" sample  and above noted "AT" command but modem didn't turn on.

    The modem turns on, but it is not able to connect to a network. Instead, it is rejected with reject cause 15.

    2021-12-29T12:37:14.712Z DEBUG modem << +CEREG: 2,"A9F6","000AF905",9
    2021-12-29T12:37:15.484Z DEBUG modem << +CNEC_EMM: 15
    2021-12-29T12:37:15.512Z DEBUG modem << +CEREG: 2,"A9F6","000AF905",9,0,15

    Cause #15 – No suitable cells in tracking area

    This EMM cause is sent to the UE if it requests service, or if the network initiates a detach request, in a tracking area where the UE, by subscription, is not allowed to operate, but when it should find another allowed tracking area or location area in the same PLMN or an equivalent PLMN.

    This usually indicates a problem with the subscription or the network, e.g. NB-IoT is not supported.

    Captain CK said:
    Also I have another question how do I configure CAT LTE M1 configuration on nRF9160 DK, can you give any guide or recommendation on this. If there is AT commands for this add them too.

    You can use the AT%XSYSTEMMODE command:

    AT%XSYSTEMMODE=1,0,1,0 (this will also enable GPS, if you don't want/need that, change the second 1 to 0).

    You can then store the setting in modem flash with AT+CEREG=0.

    Note that the %XSYSTEMMODE command only can be used when the modem is in flight mode (+CFUN=4) or offline (+CFUN=0).

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