Power Saving Mode (Psm) - Quectel BG95 Series Hardware Design

Hardware:
W_DISABLE#* is pulled up by default. Driving it to low level will let the module enter into airplane mode.
Software:
AT+CFUN=<fun> provides choice of the functionality level, through setting <fun> into 0, 1 or 4.
 AT+CFUN=0: Minimum functionality mode. Both (U)SIM and RF functions are disabled.
 AT+CFUN=1: Full functionality mode (by default).
 AT+CFUN=4: Airplane mode. RF function is disabled.
NOTES
1. Airplane mode control via W_DISABLE#* is disabled in firmware by default. It can be enabled by
AT+QCFG="airplanecontrol" command which is still under development. Details about the
command will be provided in document [2].
2. The execution of AT+CFUN command will not affect GNSS function.
3. "*" means under development.

3.4.2. Power Saving Mode (PSM)

BG95 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 PDN
connections. So BG95 in PSM cannot immediately respond users' requests.
When the module wants to use the PSM it shall request an Active Time value during every Attach and
TAU procedures. 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. If the module wants to change
the Active Time value, e.g. when the conditions are changed in the module, the module consequently
requests the value it wants in the TAU procedure.
If PSM is supported by the network, then it can be enabled via AT+CPSMS command.
Either of the following methods will wake up the module from PSM:
 Drive PWRKEY pin to low level will wake up the module.
 When the T3412_Ext timer expires, the module will be woken up automatically.
 The Main UART data will wake up the module and the function is under development.
NOTE
Please refer to document [2] for details about AT+CPSMS command.
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