NAS-RAI (Non-Access Stratum RAI) used on NB-IoT with nRF9161/51

[fdup78]

Hello,

NAS-RAI (Non-Access Stratum RAI) used on NB-IoT Control Plane : on nRF9160 it was controllable via the AT%XRAI command, using the <rai> parameter :

0 – Undefined, default

3 – Control plane one response

4 – Control plane no response

Is this NAS-RAI over NB-IoT feature also available with latest nRF9161/51 version (SDK 2.6.1) ?

What is the equivalent AT command(s) on nRF9161/51 ?

[Øyvind]

Hello François.

I'm not able to find any information on this in the current nRF91x1 Cellular AT Commands document. I could only find information on Release assistance indication %RAI as I assume you have as well.

Edti: The supported AT commands are set in the modem FW i.e. nRF91x1 SiP LTE firmware. See release notes on current version 2.0.1 here.


Will need to ask internally. I hope to have an answer by end of tomorrow.

Kind regards,
Øyvind

[Øyvind]

I see now that the release notes state:

Removed support of AT%XRAI AT command functionality. Release Assistance Indication (RAI) feature for LTE-M and NB-IoT can be used with AT%RAI AT command and socket option interface.

But will ask internally for more information, if any.

Kind regards,
Øyvind

[Øyvind]

What is the equivalent AT command(s) on nRF9161/51 ?

Using %RAI is enough. Modem will then, depending on active system and NW support, use either AS-RAI, CP-RAI (referred as NAS-RAI) or both of them when possible.

%RAI contains internal improvements compared to %XRAI.

Achim Kraus said:

Not sure, if Please consolidate nRF9160 documentation about CP-RAI and AS-RAI is valid for mfw-2.0.1.

Yes, RAI functionality counts on the fact that application always configures socket option “NO_DATA” after all data has been sent (possibly with the RAI socket option) and a response from server containing user data (i.e. delivered via socket) is not expected.

But RAI depends also on network support and the protocols used, starting from TCP or UDP and everything above that.