Skylo NTN: Signal Quality Check feature

[JordanYates]

The NTN AT command guide documents a "Signal quality check" option for performing a pre-check before attempting to re-attach to the Skylo network:

https://docs.nordicsemi.com/r/bundle/ref_at_commands_nrf91x1_ntn/page/ref/at_commands/ntn/skylo_set.html

I can't find any information on how this feature works elsewhere in the docs:

• When the check runs
• Whether it can be manually triggered by the application (without the attach step if it passes)
• How the application is notified on failure or success

Being able to manually trigger the check and receive a result in the application (ideally with signal strength information) would be extremely advantageous for quickly evaluating connection strength without having the send dozens of packets to calculate success rates. In a production environment, getting a notification on failure is important for handling pending data.

Alternatively, does `AT%XMONITOR` serve the purpose of application-level signal strength evalulation for NTN?

[Syed Maysum Abbas Zaidi]

Hi,

Basically quality is evaluated only when EMM (EPS Mobility Management) re-triggers their procedure. UE is allowed to transmit if signal quality has been improved.

Also yes, it is true that trying to sent packet is needed. UE evaluates signal quality per EMM procedure (ATTACH, TAU or Service Request), and each procedure starts always as a fresh attempt meaning that signal quality recording starts at first attempt.

I hope it helps. Thanks