Is there an comparison of the power consumption to attach and transmit to a newtork using PSM vs turning modem on (cold boot)?

[rkguy]

Speaking with various MVNOs, not all carriers support PSM or eDRX when roaming, so I am interested in the time and wattage consumed transitioning 
from PSM --> to ready to transmit
and
from modem off --> to ready to transmit

Understanding that the current consumption in PSM is very low, I'm just interested in the time and current it takes for network attach, registration, etc.

I read in the forums that it is costly to connect to the network from cold but I'd love to actually see numbers if they are available:

* x Watts modem off to complete boot (ready to send/rx)

* y Watts PSM to full functionality (ready to send/rx)

If this information available?

[Didrik Rokhaug]

Hi,

It is not really possible to give these numbers. They are too dependent on the local network conditions, if the device has been connected to that network before, if it has moved since the last time, etc.

There are some numbers, particularly for Tracking Area Updates (coming out of PSM) in the PS: https://infocenter.nordicsemi.com/topic/ps_nrf9160/_tmp/alta.nRF9160/autodita/CURRENT/parameters.id_current_modem.html

Your best bet is to measure the difference, in the scenarions your device is most likely to encounter.

Best regards,

Didrik