nRF9151 Power consumption over NTN

[Jostin]

Hi everyone,

I am currently working with Circuit Dojo nRF9151 using nRF Connect SDK v3.0.1.

When measuring power consumption over MQTT and UDP, i noticed ~25mA every ~1.4s when using NTN, what is not the case on LTE-M. Someone knows how to reduce or eliminate it ?

Setup :

Firmware : mfw_nrf9151-ntn_1.0.0-1.alpha

PSM/eDRX : enabled

Protocols : MQTT & UDP

Crucially, it disappears immediately once the socket is closed

Questions:

1. Is this 1.4s cycle a mandatory requirement for NTN synchronization to handle Doppler/latency?

2. Is there a way to trigger a faster RRC Release without manually closing the socket every time (already used RAI)?

3. Has anyone managed to get a "clean" RRC-Idle state (no spikes) while keeping a TCP/UDP socket dormant in NTN?

Jostin

[Achim Kraus]

I will use a PPK II.

That test was more about stability, not about the power consumption. That's larger than on earth, but in my experience, not the limiting factor.

[Achim Kraus]

ppk2-ntn-gps.zip

ppk2-ntn-gps2.zip

The profiles starts on earth and switches then to sky. At least the last two measurements in each are NTN.

(On earth, the feather hast a quiescent current of 7µA. I didn't analyze, why it takes 47µA with NTN.

[Jostin]

Okay thanks, can you share your github or your code please ?

[Achim Kraus]

CoAP/DTLS 1.2 CID/NTN

[Jostin]

Okay, thanks