Product Info

LPWA Module Series
BG95 Hardware Design
BG95_Hardware_Design 34 / 88
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 PSM to reduce 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, it will confirm the
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:
 A rising edge on PON_TRIG will wake up the module from PSM. (Recommended)
 Drive PWRKEY low will wake up the module.
 When the T3412_Ext timer expires, the module will be woken up automatically.
Please refer to document [2] for details about AT+CPSMS command.
3.4.3. Extended Idle Mode DRX (e-I-DRX)
The module (UE) and the network may negotiate over non-access stratum signalling the use of e-I-DRX
for reducing its power consumption, while being available for mobile terminating data and/or network
originated procedures within a certain delay dependent on the DRX cycle value.
Applications that want to use e-I-DRX need to consider specific handling of mobile terminating services or
data transfers, and in particular they need to consider the delay tolerance of mobile terminated data.
In order to negotiate the use of e-I-DRX, the UE requests e-I-DRX parameters during attach procedure
and RAU/TAU procedure. The EPC may reject or accept the UE request for enabling e-I-DRX. In case the
EPC accepts e-I-DRX, the EPC based on operator policies and, if available, the e-I-DRX cycle length
value in the subscription data from the HSS, may also provide different values of the e-I-DRX parameters
than what was requested by the UE. If the EPC accepts the use of e-I-DRX, the UE applies e-I-DRX
based on the received e-I-DRX parameters. If the UE does not receive e-I-DRX parameters in the
relevant accept message because the EPC rejected its request or because the request was received by
NOTE