HPPLMN search - Please consolidate advice.

Since being aware of the power consumption of the "HPPLMN searchs", I'm struggling to see the right strategy.

What makes me really wondering, is that the first questions are raising already two years ago:

nrf9160 psm and hplmn search on roaming sim cards

unfortunately, the answer is missing there.

3 months ago in lte_lc_nw_reg_searching and lte_lc_modem_evt_search_done the recommendation was to lock the PLMN.

2 weeks ago in measured scanning procedure a few minutes after connection establishment the recommendation was "use only home network".

Using "only home network", really? Isn't the downside of that, that SIM cards of MVNOs are always roaming?

Therefore I would really appreciate, if Nordic spend some more time in investigate, what users should do.

The first question 2 years ago, mentions, that other modems offers to disable the HPPLMN search. Maybe that's considered.

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  • Hi Achim,

    The SIM Card offers at least two lists:

    • User controlled PLMN selector with Access Technology '6F60'
    • Operator controlled PLMN selector with Access Technology '6F61'

    Which one does Nordic support? What is the priority, when both are used?

    Nordic supports both. User controlled PLMN list has higher priority than the operator controlled PLMN list - as per 3GPP.

    Does the modem executes such a search, even if in roaming already the highest priority PLMN is active?

    No.

    What PLMN encoding does Nordic assume/support in the selector list? e.g. is "62F210" interpreted as "26201"?

    Yes it is: MCC2MCC1MNC3MCC3MNC2MNC1. If MNC3 is 'F' it is ignored.

    Does "%XDATAPRFL" change the interval of the SIM-Card for such a HPPLMN search?

    No. Data profile is proprietary functionality and does not break 3GPP specification.

    Does "%REDMOB" change the interval of the SIM-Card for such a HPPLMN search?

    No.

    Best regards,

    Charlie

Reply
  • Hi Achim,

    The SIM Card offers at least two lists:

    • User controlled PLMN selector with Access Technology '6F60'
    • Operator controlled PLMN selector with Access Technology '6F61'

    Which one does Nordic support? What is the priority, when both are used?

    Nordic supports both. User controlled PLMN list has higher priority than the operator controlled PLMN list - as per 3GPP.

    Does the modem executes such a search, even if in roaming already the highest priority PLMN is active?

    No.

    What PLMN encoding does Nordic assume/support in the selector list? e.g. is "62F210" interpreted as "26201"?

    Yes it is: MCC2MCC1MNC3MCC3MNC2MNC1. If MNC3 is 'F' it is ignored.

    Does "%XDATAPRFL" change the interval of the SIM-Card for such a HPPLMN search?

    No. Data profile is proprietary functionality and does not break 3GPP specification.

    Does "%REDMOB" change the interval of the SIM-Card for such a HPPLMN search?

    No.

    Best regards,

    Charlie

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