LTE connection timeout

[anicare-tero]

Hi,

There is an option CONFIG_LTE_NETWORK_TIMEOUT for the LTE Link Control. The default is 600 seconds (10 minutes) but I couldn't find any suggestions for the timeout and all of the Nordic samples are using the default timeout.

For now I have 60 second timeout and if the device won't connect to the network, it will try again after one hour. And this seems to kill the battery pretty quickly if the device is out of the network range. At the office it seems to connect to the network in 2-6 seconds but sometimes in about 30 seconds but it's different on the field.

So I would like to know at least these:

1. How much does the connect process consume power?
2. Do you have any suggestions for how long the timeout should be?
3. What are the differences on LTE-M and NB-IoT connection processes or are there any differences? Connection time, power consumption?

Regards,
Tero

[Hakon]

Hello,

 

How much does the connect process consume power?

 the avg. current draw during scanning is 35 mA.

 

Do you have any suggestions for how long the timeout should be?

 You need to test how long it takes to attach to your network. You can apply the bandlock command if you know the bands of your network, then you can scan on these bands exclusively. That should speed up the connection time.

 

What are the differences on LTE-M and NB-IoT connection processes or are there any differences? Connection time, power consumption?

 I'm not sure if there are differences in the initial connection process. There are differences when moving between base stations.