NRF9160 Modem Band Scan

[Thomas]

Hi,

Is there any way to tell when the modem has finished doing a band scan? I would like to know so I can swap between CAT-M1 and NB-IoT for globally deployed devices. 

Kind regards,

Thomas

[Hakon]

Hello,

you can use the +CEREG command to check the connection status. <stat> should be 0 if it is not searching, 2 if it is searching, and 1 or 5 if it is registered.

[Thomas]

Hi Hakon,

From what I see it just stays in mode 2, and does not transition to mode 0?

[Hakon]

It can usually take several minutes to get an LTE connection. You can reduce the time it takes by applying bandlock if you know which band to use. What operator/SIM are you using?

[Thomas]

Hi Hakon,

Sorry for the misunderstanding. We sell our products globally so we don’t know whether an end user will be requiring NB-IoT or CAT-M1 so we need to switch between the two if the device is not registering. So I was hoping to find a way to determine when the modem has finished doing a band scan on one technology so I can swap to the other. But it seems CEREG does not transition from mode 2 to mode 0 if a scan fails?

[Hakon]

Thomas said:

But it seems CEREG does not transition from mode 2 to mode 0 if a scan fails?

 What do you mean by "if a scan fails"? As far as I know the modem will keep searching until it finds a network. How do you know it is failing?