NRF9160 Reduce power consumption

RE: NRF9160 Reduce power consumption

jermi — Tue, 11 Jan 2022 04:24:58 GMT

Hi：

NCS1.8.0 version lwm2m project, I added CONFIG_SERIAL=n to PRJ.CONF, but after generating the project, there is still a macro of #define CONFIG_SERIAL 1 in AUTOCONF.H, how can I cancel this macro?

JERMI.JIN

RE: NRF9160 Reduce power consumption

Øyvind — Fri, 07 Jan 2022 10:45:32 GMT

[quote user="jermi"]What does the value of CONFIG_LTE_EDRX_REQ_VALUE_NBIOT specifically mean?[/quote]

From the KConfig reference documentation of CONFIG_LTE_EDRX_REQ_VALUE_NBIOT

Sets the eDRX value to request when NB-IoT is used. The format is half a byte in a four-bit format. The eDRX value refers to bit 4 to 1 of octet 3 of the Extended DRX parameters information element. See 3GPP TS 24.008, subclause 10.5.5.32. The value 1001 corresponds to 163.84 seconds.

From 3GPP TS 24.008 table 10.5.5.32:

More information can be found in our AT commands documentation for eDRX setting (+CEDRXS)

RE: NRF9160 Reduce power consumption

jermi — Fri, 07 Jan 2022 02:39:11 GMT

I modified it to TCPIP on NRF9160 (NCS1.8.0) UDP DEMO, and used edrx in NB mode,
CONFIG_LTE_NETWORK_MODE_NBIOT=y
CONFIG_UDP_EDRX_ENABLE=y
CONFIG_LTE_EDRX_REQ_VALUE_NBIOT="0010"

Test power consumption, the minimum is 35uA, but there will be a large current every few seconds, what else is wrong with the setting，What does the value of CONFIG_LTE_EDRX_REQ_VALUE_NBIOT specifically mean?

RE: NRF9160 Reduce power consumption

Øyvind — Thu, 06 Jan 2022 12:40:20 GMT

Hello,

You can configure CONF_SERIAL and CONFIG_LOG both to n in your prj.conf. You can use the nRF9160: UDP sample as an example, as this is designed for low power.

[quote user=""]found that the power consumption increases every 2.5 seconds.[/quote]

How did you find this increase? Have you measured? Is you device using PSM? Have a look at this guide on how to do current measurements on the nRF9160

Kind regards,
Øyvind