Integration Manual
TSD-19090601 - R15 Contents Page 28 of 143
It must be noted that the actual current consumption of the module in LTE connected mode depends also
on the specific concurrent activities performed by the integrated CPU, beside the actual Tx power and
antenna load.
Time
[ms]
Current [mA]
Current consum pt ion value
depends on TX power and
act ual ant enna load
1 Slot
1 Resource Block
(0.5 ms)
1 LTE Radio Fram e
(10 m s)
0
300
20 0
100
500
40 0
60 0
700
800
90 0
Figure 7: VCC current consumption profile versus time during LTE connection (TX and RX continuously enabled)
1.5.1.5 VCC current consumption in cyclic low power idle mode / active mode
When both the USB and the Ethernet SGMII interfaces are either suspended or unconnected, the module
enters low power idle mode whenever possible by default on the "50" product version, or if the power
saving configuration is enabled by the AT+UPSV command on the "50" product version (see the TOBY-L3
series AT Commands Manual [2]), or if power state manager is enabled on the "00" product version.
When the module is registered or attached to a network, the module must periodically monitor the paging
channel of the current base station (paging block reception), in accordance with the 2G/3G/LTE system
requirements, even if connected mode is not enabled by the application. When the module monitors the
paging channel, it wakes up to the active mode to then enable the reception of the paging block. In
between, the module switches to low power idle mode. This is known as discontinuous reception (DRX).
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 the broadcast channel sent to all users on the same serving
cell:
In 2G, the paging period can vary from 470.8 ms (DRX = 2, length of 2 x 51 2G frames = 2 x 51 x
4.615 ms) up to 2118.4 ms (DRX = 9, length of 9 x 51 2G frames = 9 x 51 x 4.615 ms)
In 3G, the paging period can vary from 640 ms (DRX = 6, i.e. length of 2
6
3G frames = 64 x 10 ms) up
to 5120 ms (DRX = 9, length of 2
9
3G frames = 512 x 10 ms).