LTE-M behavior and Power saving Modes

[Earthworn1]

Hi,

I m seeing a wierd behavior when communicating over LTE with the nRF9160.

According to iBasis you can communicate with the eSIM with LTE-M in Germany and PSM is supported.

i connect to an LTE-M Network. Disabling or Enabling PSM or DRX dosen't change anything. 

The picture below shows the Power Consumption. I m not sure what happens after 20 Seconds after connecting to the Network. Can some one explain?

It seems that PSM dosn't work here. How can i check if PSM is availabel and used?

The other thing is when changing to NBioT. It works so the network coverage map from iBasis isn't Up To Date. iBasis-simplified-coverage-map-for-web.pdf (nordicsemi.com)

Activating PSM does make a difference as shown below. 

PSM deactivated

PSM aktivated

Is this how PSM should work?

Can someone explain what happens?

[Torje]

Hello,

Did you try running it for a longer time than whats shows in the top picture? 

[Torje]

In your LTE Event handler, do you handle this case:

case LTE_LC_EVT_PSM_UPDATE:
		LOG_DBG("LTE_EVENT: PSM parameter update: TAU: %d, Active time: %d",
				evt->psm_cfg.tau, evt->psm_cfg.active_time);
		break;

What does it log?