HPPLMN search - difference mfw 1.3.1 and 1.3.2

RE: HPPLMN search - difference mfw 1.3.1 and 1.3.2

Achim Kraus — Wed, 14 Jun 2023 19:15:04 GMT

With mfw 1.3.5, the modem will not longer search for the 90140.

See mfw_nrf9160_1.3.5_release_notes.txt:

- Fix for higher priority PLMN search. Global PLMN IDs (start with digit 9) are no more
automatically considered to be suitable for higher priority PLMN search and selection.

RE: HPPLMN search - difference mfw 1.3.1 and 1.3.2

Achim Kraus — Wed, 28 Dec 2022 10:18:45 GMT

> That is why the search is now initiated with MFW 1.3.2.

Thanks a lot. So my observation updating to MFW 1.3.2 is true.

RE: HPPLMN search - difference mfw 1.3.1 and 1.3.2

Øyvind — Wed, 28 Dec 2022 10:13:02 GMT

Hello,

I've asked the modem team, who provided answers as in your previous HPPLMN cases

The mentioned fix was related to network selection algorithm in general, including HPPLMN search.

%XDATAPRFL is not related if the device is stationary and in a stable radio conditions (no need to search for better cell).

The fix explains the difference. MFW 1.3.1 did not recognize global PLMN IDs which is why global PLMN IDs were not considered as suitable higher priority PLMNs.

So, if the home network (MCC starting with 9) is the only preferred network in the SIM card, it is not ever searched unless already camped on PLMN with the same MCC. As I said earlier, only networks from the current country are considered as suitable candidates in HPPLMN search. The fix in 1.3.2 was that PLMN starting with 9 is a global PLMN and can be found from anywhere and that is why it is also considered as suitable candidate in HPPLMN search. That is why the search is now initiated with MFW 1.3.2.

Hope this provides some answer to you.

Kind regards,
Øyvind

RE: HPPLMN search - difference mfw 1.3.1 and 1.3.2

Øyvind — Tue, 27 Dec 2022 12:38:24 GMT

Hello,

Due to Christmas Holidays our team is lower staffed than normal and some delays in our answers must be expected. We apologize for the inconvenience.

We will need some time to provide an answer to this as most of our modem team is currently out of office.

Kind regards,
Øyvind