AGPS Example .Question related to PSM command disablement

[Israel F]

Hi,

I'm interested to use AGPS in my project. Looking into AGPS example (link below) , I want to prevent using low power mode since as far as I know using this command you loose a time control of wake up and it depends on network you use.

So, since we want full wake up control I prefer not to use it .can someone help to provide and example of AGPS without power save mode?

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/serial_lte_modem/doc/GNSS_AT_commands.html

Israel

[Didrik Rokhaug]

Hi,

I want to prevent using low power mode since as far as I know using this command you loose a time control of wake up and it depends on network you use.

The device can still wake up whenever it want's. What is decided by the network is just the maximum amount of time the device can sleep before it has to check in with the network again.

So if the device wants to send data more often, it is free to do so.

Also, when using the GPS it is best if you use PSM, so that the GPS is able to run while the LTE stack sleeps.

PSM is usually disabled by default, unless the modem has been configured to use it, and the setting has been stored in the modem flash. If so, you can disable PSM with AT+CPSMS=0.

Best regards,

Didrik

[Israel F]

Hi,

Thanks for your reply. Of course the default is PSM is disabled so once I tried to run same example without using "AT+CPSMS=1"  AGPS would not work. 

I can guess why, because LTE is still enabled (since we ran CFUN=1) and we have to disable it for GNSS activation, so my question is how can we still run AGPS example without PSM .Can you try and share full sequence?

Israel

[Didrik Rokhaug]

I assume you are still using the Serial LTE Modem?

You can disable LTE (while leaving the GNSS enabled) with AT+CFUN=20.

So you can issue that command before you start the GPS, or after injecting the AGPS data.

To start the LTE stack again, you can use AT+CFUN=21.