low power of serial lte modem

[Siyou]

Hi

We tested the idle feature(by AT#XSLEEP=0)  on nRF9160DK, but no significant change of power consumption before and after enter into IDLE mode, is this result correct or performed as expected? Could you share your result?

avg current before enter into idle: 1.535mA

avg current after enter into idle: 1.527mA

PS: the pulse is the input AT command AT#XSLEEP=0

[Simon]

Could you try to set XSLEEP to 1, which will make it enter sleep? By default, it is set to 0 (idle). We are working on improving the documentation to include this.

Best regards,

Simon

[Siyou]

Hi Simon,

Due to our application needs the LTE service always be online, so we cannot shutdown the modem and enter into system 0ff mode(cannot use AT#SLEEP=1).

That is, our question is how much power consumption can be reduced without power-off modem?

Is the slm already in IDLE mode before issuing AT#XSLEEP=0?

[Simon]

I am sorry for the delay, The staffing is reduced during easter due to holidays and I will be gone this week, but I will be back Tuesday next week and will look at your ticket then.

Best regards,

Simon

[Simon]

Siyou said:

Is the slm already in IDLE mode before issuing AT#XSLEEP=0?

 Yes, it is.

Siyou said:

That is, our question is how much power consumption can be reduced without power-off modem?

Have you looked into eDRX or PSM? This allows your modem to sleep between transmitting/receiving to/from the network.

Check out this blog

Best regards,

Simon

[Siyou]

Hi,

Thanks for your info.

We already have eDRX setting for modem power save.