case about nRF9160 LTE and gps

Hello Peter,

1. I want to use BOTH LTE and GPS, which example is the most intuitive to verify.

I would recommend the Serial LTE modem to get started. You can use conventional AT commands to configure the modem and establish a connection to the network. Afterwards, SLM specific GNSS AT commands can be used to perform GPS operations.

2. What instructions or functions should be used for SWITCHING between LTE and GPS?

Pre-configuration via %XSYTEMMODE, otherwise +CFUN can be used to switch operation mode. If both LTE-M/NB-IoT and GNSS support is enabled and activated, GPS operations only run while LTE-M/NB-IoT is in PSM.

3. What is the minimum time interval between LTE and GPS switching?

4. In the case of poor LTE signal and GNSS signal, what should be the minimum switching interval?

I’m not sure if I fully understand these questions, but there should be no minimum here. When both LTE and GNSS are enabled, GNSS will run as soon as LTE is in PSM. When modem leaves PSM, GNSS related operations will be blocked.

But the application can decide to switch manually at any time as well via +CFUN, depending on use case and environment.

5. If the SIM card does not support EDRX and PSM, then LTE and GNSS cannot be used simultaneously

That is correct.

Regards,

Markus

Hi Albrecht Markus Schellenberger,

Thank you for your answers. They are very useful to customers.

I also want to know: can THE LTE socket stay connected to the server when LTE and GPS work together?

Thank you for all your assistance.
Kind regards,
Peter.Min

peter.min said:

Thank you for your answers. They are very useful to customers.

My pleasure, Peter :-)

peter.min said:

I also want to know: can THE LTE socket stay connected to the server when LTE and GPS work together?

Yes, it will. Depending on the server implementation and transport protocol the connection might time out from the server side though, which requires a keep-alive ping. If the server has terminated the connection, the the UE will close the socket eventually.

Regards,

Markus

Hi Albrecht Markus Schellenberger,

Thank you for all your assistance.
Kind regards,
Peter.Min