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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. In this case, driving
PON_TRIG low will set the module into PSM.
Any of the following methods can wake up the module from PSM:
Drive PON_TRIG high and remain it high, the module will wake up from PSM. PON_TRIG is pulled
down by default.
When the T3412 timer expires, the module wakes up from PSM automatically. In this case, the main
UART interface is inaccessible until PON_TRIG is pulled high.
NOTE
1.
PON_TRIG must be pulled high after executing any PSM wake-up event, otherwise the main UART
will be inaccessible. In any case, the main UART interface is inaccessible until PON_TRIG is pulled
high.
2.
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
relevant accept message because the EPC rejected its request or because the request was received by
EPC not supporting e-I-DRX, the UE shall apply its regular discontinuous reception.
If e-I-DRX is supported by the network, perform the steps below in sequence to let the module enter
BG950A-GL&BG951A-GL_Hardware_Design
LPWA Module Series
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