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Cinterion
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TX62-W(-B/-C)/TX82-W Hardware Interface Description
3.3 Power Saving
109
t TX62-W_TX62-W-x_TX82-W_HID_v01.000 2021-05-19
Confidential / Preliminary
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3.3.3 Power Saving while Attached to LTE M1 NB1/2 Networks
This section describes the power saving possibilities in LTE Cat M1 and LTE Cat NB1/2 net-
works through DRX (see Section 3.3.3.1) values, as well as configurable eDRX (see Section
3.3.3.2), and 3GPP PSM (see Section 3.3.3.3) timers.
3.3.3.1 DRX (Standard Configuration)
TX62/TX82 can be enabled to use DRX (Discontinuous Reception) in RRC idle mode to reduce
power consumption (see also Section 3.3.1.1). The power saving possibilities while attached
to an LTE Cat M1 or LTE Cat NB1/2 network depend on the paging timing cycle of the base
station.
During normal operation, i.e., the module is connected to an LTE Cat M1 or LTE Cat NB1/2
network, the duration of power saving period varies. It may be calculated using the following
formula:
t = DRX Cycle Value * 10 ms
DRX cycle value in LTE Cat M1 or LTE Cat NB1/2 networks is any of the four values: 128, 256,
512 and 1024, thus resulting power saving intervals between 1.28 and 10.24 seconds. The
DRX cycle value of the base station is assigned by the network operator.
In the pauses between listening to paging messages, the module resumes power saving, as
shown in Figure 44.
Figure 44: DRX based paging and power saving (SLEEP) in LTE Cat M1 and Cat NB1/2 networks
The varying pauses explain the different potential for power saving (SLEEP mode). The longer
the pause the less power is consumed.
Paging Powersaving(SLEEP )
DRXpagingcycle
1.28‐10.24s econds
Paging Powersaving(SLEEP) Paging Powersaving(SLEEP) Paging
DRXpagingcycle DRXpagingcycle
1.28‐10.24seconds 1. 28‐10.24seconds