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TOBY-L1 and MPCI-L1 series - System Integration Manual
UBX-13001482 - R04
Advance Information
System description
Page 19 of 90
1.5.1.3
VCC and 3.3Vaux current consumption in cyclic idle/active mode (power saving enabled)
The power saving configuration is by default disabled, but it can be enabled using the AT+UPSV command (refer
to
TOBY-L1 series AT Commands Manual
[3]). When power saving is enabled, the module automatically enters
the low power idle-mode whenever possible, reducing current consumption.
During low power idle-mode, the module processor runs with 32 kHz reference clock frequency.
When the power saving configuration is enabled and the module is registered or attached to a network with
connected-mode not enabled, the module automatically enters the low power idle-mode whenever possible, but
it must periodically monitor the paging channel of the current base station (paging block reception), in
accordance to LTE system requirements. When the module monitors the paging channel, it wakes up to the
active-mode, to enable the reception of paging block. In between, the module switches to low power idle-mode.
This is known as LTE discontinuous reception (DRX).
The module processor core is activated during the paging block reception, and automatically switches its
reference clock frequency from 32 kHz to the 26 MHz used in active-mode.
The time period between two paging block receptions is defined by the network. This is the paging period
parameter, fixed by the base station through broadcast channel sent to all users on the same serving cell.
The time interval between two paging block receptions can be from 320 ms (DRX = 5, length of 2
5
radio frames
= 32 x 10 ms = 320 ms) up to 2560 ms (DRX = 8, length of 2
8
radio frames = 256 x 10 ms = 2560 ms).
Figure 5 illustrates a typical example of the module current consumption profile when power saving is enabled.
The module is registered with 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. Detailed current consumption
values can be found in
[1] or in
MPCI-L1 series Data Sheet
~50 ms
IDLE MODE
ACTIVE MODE
IDLE MODE
Active Mode
Enabled
Idle Mode
Enabled
~0.27-2.51 s
IDLE MODE
~50 ms
ACTIVE MODE
Time [s]
Current [mA]
0
Time [ms]
Current [mA]
0
RX
Enabled
200
100
300
200
100
300
Figure 5: An example VCC / 3.3Vaux current consumption profile versus time with power saving enabled and module registered
with the network: the module is in idle-mode and periodically wakes up to active-mode to monitor the paging channel