Hello,
I'm doing a few power consumption tests on the nrf9160 DK with NB-IoT for a battery powered application. PSM mode works as expected but I measured a current drain of about 35mA a few minutes after the nrf9160 has connected to the cellular network (see screenshots below). The procedure that leads to the 35mA is as follows:
- Powered the nrf9160 DK
- Application on the nrf9160 establishes a connection to the NB-IoT network
- Application on the nrf9160 exchanges data with a cloud application every 60s (works as expected)
- About 2 minutes after the connection establishment procedure the nrf9160 modem consumes 35mA for about 1 to 2 minutes while the data exchange with the cloud still works as expected.
In the case I linked below it turned out that the current drain of about 35mA is due to the network scanning procedure. I assume this also applies to my case. But in the linked case they only talk about a scanning procedure during the connection establishment process and not if the system is already connected.
Now I wanted to know if it is normal that the modem performs a scanning procedure while it is already connected?
If yes, can I disable the scanning procedure that is executed while in connection? Because it consumes a lot of energy and the nrf9160 is already connected anyway.
Start of the scanning procedure after a packet exchange
Packet exchange during the scanning procedure
How the scanning procedure looks like when zoomed in
End of the scanning procedure
I use the following setup:
- nrf9160 DK revision 1.1.0
- ncs v2.0.0
- modem firmware is mfw_nrf9160_1.3.2
- MNO is Deutsche Telekom
Thanks in advance.
Best regards,
Christian
