High power consumption in DRX

[GiulianoFranchetto]

Hi,

We are currently testing DRX (not eDRX) on our custom board, and we would like to reduce the power consumption.

When everything on the board is in low power mode, we reach around 140µA.

We then start the nRF9160 and connect it to the network.

We can see that the consumption oscillates from 5mA to about 30mA, showing that the DRX is indeed activated.

Is there any possibility to reduce the 5mA consumption? I don't know if it's the base band which consumes that power, or the applicative M33 core.

If it's the M33, how can we put it in low power, and wake up for example when a message comes from our server? (we are using LwM2M)

Regards

Giuliano

[Sigurd]

Hi,

1) Are you sending or receiving any data?

2) Do you see any difference if you request a long eDRX interval ?

3) What is your application doing after connection ?

4) Do you see any difference in the power consumption if you use modem fw 1.1.0 ? (can be download from this link)

[GiulianoFranchetto]

Hi,

1) Not on this test. I just connect to the network. In real life, we will be using a LwM2M client after the connection is successful

2) No eDRX in France yet, so can't test with it

3) Nothing in the test (k_cpu_idle()). Normally, we will be uding LwM2M

4) I'm going to try that today

Regards

[Sigurd]

Hi,

If you are still seeing this issue with modem fw 1.1.0, could you then post the main.c and prj.conf file you used ? If you used an overlay file, please post that also.

A modem trace would also be helpful. See this link on how to get that.