RE: Modem Functionality on nRF9160

dejans — Fri, 05 Aug 2022 07:25:23 GMT

Hi,

I am glad that you find the answers helpful.

Best regards,
Dejan

RE: Modem Functionality on nRF9160

Tester013 — Wed, 03 Aug 2022 15:20:50 GMT

Thank you for the answers, they are very helpful!

RE: Modem Functionality on nRF9160

dejans — Tue, 02 Aug 2022 11:52:36 GMT

Hi,

[quote user=""]1. How does the modem determine which eNB to connect to? Is the criteria solely based on signal strength, or are there any other considerations?[/quote]

Network determines the threshold for good cell (SIB1). Both RSRP and RSRQ are considered.

[quote user=""]2. Is it necessary/possible to adjust the broadcasting strength of the modem module to account for differing signal quality and strengths, or is this done automatically in the background?[/quote]

Modem adjusts for different signal quality and strengths automatically.

[quote user=""]3. In the AT commands documentation, AT%NBRGRSRP has a note stating that "Neighboring cell measurements are only valid and available when neighbors are monitored, i.e. current cell quality is low enough.", so I was wondering how "low" is low enough? At what signal strength will the modem start actively searching for other nearby cells?[/quote]

"Low enough" cell quality depends on the network configuration. Modem starts actively searching for other nearby cells if currently active serving cell fails due to unacceptable cell quality. Start of the search is also dependent on the network configuration.

[quote user=""]4. In the event that the currently connected cell becomes out of range, is it necessary to manually program functionality to search and connect to another available cell or is such functionality already implemented into the libraries? Is there a time delay in switching between cells such that the nRF9160 will essentially be disconnected from the network for some period of time?[/quote]

Modem library has implemented automatic support for searching and connecting to another available cell if currently connected cell stays out of range. In case that cell search fails, modem waits a bit before starting new search.

Best regards,
Dejan

RE: Modem Functionality on nRF9160

Tester013 — Mon, 01 Aug 2022 09:09:38 GMT

Hi, I'm using NB-IoT.

Thanks

RE: Modem Functionality on nRF9160

dejans — Mon, 01 Aug 2022 09:08:49 GMT

Hi,

Do you use LTE-M or NB-IoT?

Best regards,
Dejan

RE: Modem Functionality on nRF9160

dejans — Fri, 29 Jul 2022 15:13:07 GMT

Hi,

I'll come back to you with answers at the beginning of next week.

Best regards,
Dejan