Lte link controller losing network coverage

RE: Lte link controller losing network coverage

dejans — Fri, 10 Oct 2025 05:42:56 GMT

Hi,

There was no special reason apart from getting more information about your application and more complete overall picture.

Best regards,
Dejan

RE: Lte link controller losing network coverage

scjr_dev — Thu, 09 Oct 2025 20:29:18 GMT

Thanks for the reply.

Is there a reason why you asked about PSM or eDRX ?

RE: Lte link controller losing network coverage

dejans — Thu, 09 Oct 2025 17:15:44 GMT

Hi,

lte_lc_connect_async() documentation specifies the following:
"This function sets the modem to online mode using lte_lc_normal. The client does not need to do anything to re-connect if the connection is lost but the modem will handle it automatically."
You can also look at this thread.

Best regards,
Dejan

RE: Lte link controller losing network coverage

scjr_dev — Thu, 09 Oct 2025 13:19:55 GMT

Hi dejans,

[quote userid="111786" url="~/f/nordic-q-a/124864/lte-link-controller-losing-network-coverage/550996"]When those 2 devices were moved to an area with poor connectivity, were they able to connect there automatically without problems but experienced problems when moved back to an area with good coverage?[/quote]

They both lost connection. They both stop connecting completely and never reconnected again. I got to them and moved them back to a good coverage. They were not able to reconnect and I had to power cycle, which made them connect right away.

[quote userid="111786" url="~/f/nordic-q-a/124864/lte-link-controller-losing-network-coverage/550996"]Do you use PSM or eDRX in your application?[/quote]

I use default asset tracker settings :

## Power saving timers.

### 320 hours PSM.

CONFIG_LTE_PSM_REQ=y

CONFIG_LTE_PROPRIETARY_PSM_REQ=y

CONFIG_LTE_PSM_REQ_RPTAU="10000001"

### 20 seconds active time.

CONFIG_LTE_PSM_REQ_RAT="00001010"

[quote userid="111786" url="~/f/nordic-q-a/124864/lte-link-controller-losing-network-coverage/550996"]Which modem firmware version do you use?[/quote]

2.0.2

[quote userid="111786" url="~/f/nordic-q-a/124864/lte-link-controller-losing-network-coverage/550996"]Is there possibility that you obtain and send complete log?[/quote]

Sorry I don't have more data cause I was not able to recaver logs on the field. When I moved them to a good coverage zone, I recorded the lines I sent already, before powere cycle them.

For now I am just looking to understand the LTE link library. Can you help answer my 2 questions?

Thanks

RE: Lte link controller losing network coverage

dejans — Thu, 09 Oct 2025 11:13:22 GMT

Hi,

When those 2 devices were moved to an area with poor connectivity, were they able to connect there automatically without problems but experienced problems when moved back to an area with good coverage?

Do you use PSM or eDRX in your application?

Which modem firmware version do you use?

Is there possibility that you obtain and send complete log?

Best regards,
Dejan