Extended Mode Drx (E-Drx) - SimCom SIM7000 Hardware Design

power-off, but the module remains registered on the network and there is no need to re-attach or
re-establish the network connections. So in PSM all the functions will be unavailable except the
RTC function, module cannot immediately respond users' requests.
When the module wants to use the PSM, it can be enabled via "AT+CPSMS=1" command. The
command takes effect after module reboot. 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. Module will be into PSM according to the command from network.
Either of the following methods will wake up the module from PSM:
P ulling PWRKEY pin to low level will wake up the module.
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W hen the timer expires, the module will be automatically woken up.
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5.3.5

Extended Mode DRX (e-DRX)

In idle or sleep mode, module and the network may negotiate over non-access stratum signaling the
use of extended mode DRX for reducing power consumption.
E-DRX diagrammatic sketch refer to the following figure.
ptw
DRX
Cycle length
When module and the network negotiate stratum signaling in idle mode or sleep mode, extended
mode DRX can decrease the times of paging time window (PTW) and increase the cycle length.
For this reason it had reduced the times of DRX, and had reduced the frequency of DRX between
module and the network. So that can reduce power consumption for module.
If e-DRX is supported by the network, then it can be enabled by "AT+CEDRXS" command.
Note: For details about "AT+CEDRXS", please refer to Document [1].
SIM7000 _Hardware Design _V1.04
ptw
DRX
Cycle length
Figure 31: e-DRX diagrammatic sketch
Smart Machine Smart Decision
ptw
DRX
Cycle length
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2018-1-31