Sunsea AIoT SIMCom SIM7075G User Manual page 52

When SIM7075G is in minimum functionality or flight mode, it can return to full functionality by the AT
command "AT+CFUN=1".
5.3.4 Power Saving Mode (PSM)
SIM7075G 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.

5.3.5 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.
ptw
DRX
Cyclelength
When module and the network negotiate stratum signaling in idle mode or sleep mode, extended mode
DRX can decrease the times of paging time window (PTW) and increase the cycle length. For this reason it
had reduced the times of DRX, and had reduced the frequency of DRX between module and the network.
So that can reduce power consumption for module.
www.simcom.com
ptw
DRX
Cyclelength
Figure 31: e-DRX diagrammatic sketch
SIM7075G User Manual V1.00
ptw
DRX
Cyclelength
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