LPWA Module Series
BG77 Hardware Design
BG77_Hardware_Design 27 / 76
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
EPC not supporting e-I-DRX, the UE shall apply its regular discontinuous reception.
If e-I-DRX is supported by the network, then it can be enabled by
AT+CEDRXS=1
command.
Please refer to
document [2]
for details about
AT+CEDRXS
command.
3.4.4. Sleep Mode
BG77 is able to reduce its current consumption to a lower value during the sleep mode. The following
sub-chapters describe the power saving procedure of BG77 module.
3.4.4.1. UART Application
If the host communicates with module via UART interface, the following preconditions can let the module
enter into sleep mode.
Execute
AT+QSCLK=1
command to enable sleep mode.
Drive DTR to high level.
The following figure shows the connection between the module and the host.
NOTE
