Integration Manual

TSD-19090601 - R15 Contents Page 29 of 143
 In LTE, the paging period can vary from 320 ms (DRX = 5, i.e. length of 2
5
LTE frames = 32 x 10 ms) up
to 2560 ms (DRX = 8, length of 2
8
LTE frames = 256 x 10 ms).
Figure illustrates a typical example of the module current consumption profile when power saving is
enabled. The module is registered with the network, automatically enters the low power idle mode and
periodically wakes up to active mode to monitor the paging channel for the paging block reception.
~50 ms
IDLE M ODE ACTIVE M ODE IDLE M ODE
Act ive M ode
Enabled
Idle M ode
Enabled
2G case: 0.44-2.09 s
3G case: 0.61-5.09 s
LTE case: 0 .27-2.51 s
IDLE M ODE
~50 ms
ACTIVE M ODE
Time
[s]
Current [mA]
Time
[ms]
Current [mA]
RX
Enabled
0
100
200
0
100
200
Figure 8: VCC current consumption profile with low power mode enabled and module registered with the network: the module
is in low-power idle mode and periodically wakes up to active mode to monitor the paging channel for paging block reception
1.5.1.6 VCC current consumption in fixed active mode
When the USB or the Ethernet SGMII interface is not suspended, the module stays in active mode, ready to
perform its designed operations.
The module processor core is activated during idle mode, and the 19.2 MHz system clock frequency is used.
It would draw more current during the paging period than that in the power saving mode.
Figure illustrates a typical example of the module current consumption profile when power saving is
disabled. In such a case, the module is registered with the network and while active mode is maintained,
the receiver is periodically activated to monitor the paging channel for paging block reception.
It must be noted that the actual current consumption of the module in active mode depends on the specific
concurrent activities performed by the integrated CPU.