Unable to read already set configuration of eDRX mode using AT Command

[AR Jadhav]

Hello,

I am facing issue in reading the eDRX mode configurations using AT Commands on nRF9160.
Below are the details of hardware & modem fw version.

1. Modem FW version: nrf9160 version mfw_nrf9160_1.3.5

 

Issue:

I used the AT command "AT+CEDRXS=1,5,\"0000\"" to set the cell modem in eDRX mode. The modem responded with Ok , indicating the command was accepted. However, after connecting to the network, when I tried to read the set value using "AT+CEDRXS?", the response was just ok  without showing the actual value set in the device. According to the documentation, it should return the configured value along with the Ok.

Below is the code snippet:

Below is the negotiation value of network:

I want to know about the values which I have set are correctly configured and device has applied it?

Thanks,

Akshay

[Hakon]

Hello,

have you confirmed that the network will allow the device to enter eDRX? Also, in that regard a modem trace should show what is actually happening in the network.

[AR Jadhav]

Hi Hakon,

Thanks for your reply.

Below is the attached snap which shows modem power consumption spikes in eDRX mode. Also, we get the successful response as OK and values for the following AT Commands.
"AT+CEDRXS?" 

"AT+CEDRXRDP"

 

Meaning. I am able to set the eDRX mode, but I cannot see the actual power consumption happening with and without eDRX mode.
Following are the current consumption values:

1. Without eDRX mode: 19.7 mA

2. With eDRX mode: ~19 mA

Can you please let us know about the power consumption when eDRX mode is activated.

Thanks,

Akshay

[Hakon]

AR Jadhav said:

Can you please let us know about the power consumption when eDRX mode is activated.

The eDRX current draw should be around 132 µA.

[AR Jadhav]

Okay Thanks a lot. Maybe we can test at our end.

[AR Jadhav]

Hello Nordic team,

 

I have enabled eDRX on my nRF9160 modem device, and the network has successfully negotiated the eDRX parameters. However, I am not observing any noticeable difference in power consumption after entering eDRX mode.
The measured current remains around 110 µA:

In normal mode and Even after eDRX is enabled

 

Details:

 

eDRX command used:
AT+CEDRXS=1,4,"0001"

 

 

Network response:
+CEDRXS: 4,"0001","001","0001"
OK

 

 

Note:Energy harvesting circuit and battery are both connected.

 

Is entering PSM mandatory to see a current drop? currently we are using only edrx mode 

[Hakon]

Try increasing the eDRX interval, and also make sure UART is not running (CONFIG_SERIAL=n).