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nrf9160 Band Selection Algorithm


We are wondering how nrf9160 modem decides which band to use when there are multiple bands available (LTE CAT NB) and there isn't any apllied band lock from the software side. In our use case, although there are 2 bands available for the device, it selects mostly the one which has worse RSSI. Is it possible to make one band preferable without locking the other band?

Best Regards,
Musa

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  • Hello

    I think the selection of the network can be influenced also by the SIM.

    At the moment I experience various implementation issues with network operators: some implementing PSM, others not, some taking 60s to idle the connection, always doping first packet, etc etc
    This has been an issue traditionally even with 2G and 3G networks (especially roaming).

    This is why you could scan the available networks first with AT%COPS and then have a table with priorities that take into account past experiences with the network. Especially in roaming this can save you a lot of connection attempts with exponential back-off ...

    If you know the continent you are in (GPS) or country (MCC) then you might also restrict the available bands. This can speed up network scanning and connection performance.

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  • Hello

    I think the selection of the network can be influenced also by the SIM.

    At the moment I experience various implementation issues with network operators: some implementing PSM, others not, some taking 60s to idle the connection, always doping first packet, etc etc
    This has been an issue traditionally even with 2G and 3G networks (especially roaming).

    This is why you could scan the available networks first with AT%COPS and then have a table with priorities that take into account past experiences with the network. Especially in roaming this can save you a lot of connection attempts with exponential back-off ...

    If you know the continent you are in (GPS) or country (MCC) then you might also restrict the available bands. This can speed up network scanning and connection performance.

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