Sunsea AIoT SimCom SIM7090G User Manual page 58

If SIM7090G has been set to minimum functionality mode, the RF function and SIM card function will be
closed. In this case, the serial port and USB are still accessible, but RF function and SIM card will be
unavailable.
If SIM7090G has been set to flight mode, the RF function will be closed. In this case, the serial port and
USB are still accessible, but RF function will be unavailable.
When SIM7090G is in minimum functionality or flight mode, it can return to full functionality by the AT
command "AT+CFUN=1".
5.3.5 Power Saving Mode (PSM)
SIM7090G module can enter into PSM for reducing its power consumption. The mode is similar to power-off,
but the module remains registered on the network and there is no need to re-attach or re-establish the
network connections. So in PSM all the functions will be unavailable except the RTC function, module
cannot immediately respond users' requests.
When the module wants to use the PSM, it can be enabled via "AT+CPSMS=1" command. The command
takes effect after module reboot. If the network supports PSM and accepts that the module uses PSM, the
network confirms usage of PSM by allocating an Active Time value to the module. Module will be into PSM
according to the command from network.
Either of the following methods will wake up the module from PSM:
Pulling PWRKEY pin to low level will wake up the module.

When the timer expires, the module will be automatically woken up.

5.3.6 Extended Mode DRX (e-DRX)
In idle or sleep mode, module and the network may negotiate over non-access stratum signaling the use of
extended mode DRX for reducing power consumption.
E-DRX diagrammatic sketch refer to the following figure.
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