• State Verified Answer
  • Replies 18 replies
  • Subscribers 65 subscribers
  • Views 2671 views
  • Users 0 members are here
Attachments (1) Download All
Nordic Case Info
  • Case ID: 292765
Options

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

Achim Kraus

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?

  • 0

    I had the modem team look at the modem log. Here's the response;

    The log shows that there is Higher Priority PLMN (HPPLMN) search initiated after one of the RRC connection releases and that caused the delay. The search has been specified by 3GPP and must be done while not in home network. The search is controlled by a timer and if the timer expires while in PSM, then the HPPLMN search must be done when waking up from PSM. But in this log the timer expired already before entering PSM which is why the search was initiated and completed before entering PSM.

  • 0 in reply to Hakon

    Thanks for analyzing the log.

    Is that HPPLMN search timer configurable? Or which time is used for that?

  • 0

    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

  • 0 in reply to Michael Meyer

    Hi,

    I found the same pattern for LTE-M:

    The current of the "high consumption slots" is lower (about 1 minute instead of 2,5 minutes with NB-IOT), the duration is shorter, too (30mA instead of 50mA). The timing is identical.

    Regards
    Michael 

  • 0 in reply to Hakon

    Is there a relation of %PERIODICSEARCHCONF to such HPPLMN search?

Related