nRF9160-DK - sometimes busy for 1 minute before entering PSM

Using the nRF9160-DK together with the Power Profiler Kit 2, I observe sometimes a longer period (1 minute) of a 50mA consumption before entering PSM mode.

Is there a explanation for that? Could that behavior be "forecasted", or better disabled?

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  • Hi,

    I am experiencing a very similar behaviour:

    Sending short UDP packages every 15 minutes. NB-IOT as access technology.
    The modem recognizes the roaming situation (correctly).

    After every 2 hours there are the same longer periods (about 2 minutes!) of a 50 mA consumption.
    Modem 1.3.2., NCS 2.0.0, nrf connect for desktop 3.11.1.

    I checked the USIMs in use:

    The EF_HPPLMN (ID '6F31' in ADF USIM) contains 0x01. This corresponds to the two hours "high consumption slots".
    I am currently checking with the operator on the USIM configuration, but this is ongoing.
    The EF_HPPLMN defines the HPPLMN search period (in priciple). But there are several exceptions for the modem to be considered (defined in 3GPP TS  23.122. Too complicated for me ;-)).

    So I have the same question as Armin:
    Is it possible to influence the HPPLMN search time by the application side (e.g. using AT-commands) to avoid the additional power consumption due to HHPLMN search?

    Regards,
    Michael

  • I got an answer in an other issue, see Search indication.

    If it's possible, you may chose to select the PLMN manually with AT+COPS, which prevent from HPPLMN searches.

  • Many thanks for the additional hint!
    And sorry for the late reply, I was out of office the last two weeks...

    I will check if the manual PLMN selection will change the behaviour. If yes, may be it is possible to build a kind of workaround on the application level.

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