LPWA Module Series
BG950A-GL&BG951A-GL_Hardware_Design
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3.3. Power Saving Mode (PSM)
*
BG950A-GL & BG951A-GL module can enter 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 BG950A-GL & BG951A-GL module 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
*
.
Either of the following methods will wake up the module from PSM:
Drive PWRKEY low will wake up the module.
When the T3412_EXT timer expires, the module will be automatically woken up.
When PON_TRIG is pulled high and maintains its level statue, the module will wake up from PSM
(Power Saving Mode). PON_TRIG is pulled down by default.
See
document [3]
for details about
AT+CPSMS
*
.
3.4. 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
NOTE
