eDRX / PSM mode always on?

[Eirik Aa]

So I have a question about the nRF9160 when enabling the xDRX or PSM mode. Does one just turn the option on and leave it on eaven while uploading data or do you turn it off each time you want to send some data and communicate with a socket?

lte_lc_psm_req( );
lte_lc_edrx_req( );

And do you need to request it again after sending data?

[Martin Lesund]

Hi Eirik,
Please take a look at the Asset tracker sample, more specifically the "Power Optimization"  section on how this can be achieved.

AT-commands reference:

• PSM
• eDRX

e.g. For PSM this is something that you enable  once, and you should not need to disable the PSM if you don't want to stick with the data for all the parameters set to the default "manufacturer-specific" values.

[Eirik Aa]

So just to clearify set the option ance and just dont bother about it and use that moduem when you need it and it will go back to PSM mode after that correct?

Also mesuring on the modem is seems like it uses a 25 seconds communications window and I dont get any longer timthan that!?! Using Telenor LTE-m here in Norway.

Using the same methods as the asset tracking example.

I have always adle power of about 1mA but somtimes it gets stuck at 3mA or 8mA... Without finding any reason for the excess power usage...

So two issues... One get the PSM/eDRX sorted and longer intervals... That seems ok if the above checks out.

Second how to make sure we get the correct ilde power... Is there perhaps a way to check is we might have some unhandled interrups the keeps the CPU running and preventing sleep?? And if so how to we check that... I dont think we can to the power measuremnts testing with the debugging connected? Also I get the same fault as discussed earlier still at some random events... Meaning when we use gpio/sleep...

[Eirik Aa]

Thanks for the links I will try out the documentation examples for PSM/eDRX