LPM2100 bg NB Module Hardware Usage Guide
Shanghai Yuge Information Technology Co., Ltd.
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Suitable for services that have no delay requirement for downlink data, adopt
battery-powered methods, such as meter reading services.
The process of the module entering the PSM is as follows: When the module establishes
a connection with the network or updates the location tracking area (TAU), it will apply to
enter the PSM in the request message, and the network configures the T3324 timer value
return module and starts the timer. When the T3324 timer expires, the module enters the PSM.
The module cannot apply to enter the PSM mode during emergency services or when
initializing the public data network.
When the module is in the PSM mode, related activities such as searching for cell
messages, cell reselection, and connecting to the network are turned off. However, the T3412
timer continues to work.
There are two ways for the module to exit the PSM mode: one data terminal device
actively sends data wake-up, and the other is when the T3412 timer expires, the TAU starts,
and the module exits the PSM.
Figure 3-11 PSM power saving technology
3.6.2 DRX
The DRX cycle is short (1.28s, 2.56s, 5.12s, or 10.24s is determined by the carrier
network side). The downlink service is considered to be reachable at any time with a small
delay. The module will detect whether there is a downlink service arrival, which is suitable for
services with high latency requirements. Module equipment generally adopts the way of
power supply, such as street light business.
Figure 3-12 DRX power saving technology
