Power saving mode and RAI

RE: Power saving mode and RAI

Achim Kraus — Mon, 16 Jun 2025 09:11:05 GMT

Great!

RE: Power saving mode and RAI

Filip Tefr — Mon, 16 Jun 2025 09:10:08 GMT

Yes it does, everytime I want to comunicate, I set RAI_ONE_RESP, send data and wait for response. The modem enters RRC idle after roughly 2s.

RE: Power saving mode and RAI

Achim Kraus — Mon, 16 Jun 2025 08:58:30 GMT

And with CP-RAI / NB-IoT "RAI_ONE_RESP" works?

AFAIK, it must be set before every send.

RE: Power saving mode and RAI

Filip Tefr — Mon, 16 Jun 2025 08:30:36 GMT

Thank you for the anwer.
Using AT%RAI=2 I have discovered that my network only supports CP-RAI for NB-IoT, AS-RAI is not supported at all.

RE: Power saving mode and RAI

Achim Kraus — Sat, 14 Jun 2025 07:01:15 GMT

I'm not sure, if the required RAI configuration "AT%RAI=2" (or "=1") was executed.

In general, RAI must be supported by the network as well.

The mfw 2.0.2 is able to report that with an "%RAI" event (if configured with "=2"), short after the network registration, e.g..

+CEREG: 2,"BB12","031D7865",9
%RAI: "031D7865","26202",0,1

Therefore, please check, if you configured %RAI and your network supports RAI.

And unfortunately, RAI comes with different flavors, CP-RAI (Rel 13, but NB-IoT only) and AS-RAI (Rel 14). Which one is supported by your network is encoded in the "%RAI" event above.

In the past, it wasn't too transparent, which option is supported in which mode. My experience with that is somehow poor. In the past "RAI_ONE_RESP" only worked for CP-RAI, for AS-RAI you will need to add a "RAI_NO_DATA" after receiving the response and it takes about 2s to enter RRC idle after that.

See NAS-RAI (Non-Access Stratum RAI) used on NB-IoT with nRF9161/51 or search this forum for "AS-RAI", "CP-RAI" and "RAI", but be aware, that RAI in mfw 2.0.2 is different to mfw 1.3.7.