Power Saving Signal Carrying Short Message Indication
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Solution Overview
Problem
In the RRC connected state, user equipment (UE) needs to monitor both discontinuous reception (DRX) PDCCH and paging PDCCH, leading to increased power consumption, as even if a power saving signal indicates the UE can sleep through DRX cycles, it may still be woken up to monitor the paging PDCCH for short messages like system information modifications or public warning system notifications.
Innovation Solution
A message transmission method where a power saving message, such as a PoSS, carries indication information about short messages, allowing the UE to obtain this information without monitoring the paging PDCCH, by using flag bits or cyclic shift sequences in the downlink control information or demodulation reference signal, thereby reducing the need for the UE to wake up and monitor the paging PDCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors both DRX PDCCH and paging PDCCH in the RRC connected state, then the UE can receive short messages (system information modification and public warning system notifications), but the power consumption of the UE increases
Solution Approach 1:
The patent combines the power saving signal function with the paging message function into a single signal structure. The power saving signal now carries both the wake-up indication and the short message indication, allowing the UE to obtain both functions from one signal rather than monitoring separate signals, thereby reducing power consumption while maintaining message reception capability
Solution Approach 2:
The power saving signal is designed to perform multiple functions: it indicates whether the UE should wake up for DRX monitoring and simultaneously indicates whether there is a short message available. This multi-functionality eliminates the need for separate paging PDCCH monitoring in connected state, reducing power consumption while ensuring both wake-up control and message delivery
2Use of energy by moving object
If the UE uses power saving signal to skip DRX cycles, then the UE can reduce power consumption, but the UE still needs to wake up to monitor paging PDCCH for short messages
Solution Approach 1:
The patent merges the wake-up indication and short message indication into a single power saving signal. The UE no longer needs to separately monitor paging PDCCH for short messages when in connected state with power saving signal configured, simplifying the monitoring procedure and reducing the complexity of having to handle multiple separate monitoring requirements
3Reliability
If the UE monitors paging PDCCH at least once in each default paging cycle, then the UE can obtain short messages, but the UE cannot remain in sleep state even when power saving signal indicates no wake-up needed
Solution Approach 1:
The power saving signal is enhanced to serve as a universal indication mechanism that covers both wake-up control and short message notification. When the UE is in connected state with power saving signal configured, this single signal replaces the need for separate paging PDCCH monitoring, allowing the UE to remain in sleep state while still receiving both wake-up indications and short message notifications reliably
Data Source
AI summary
A message transmission method is provided. User equipment may receive a power saving message from a network device, where the power saving message carries indication information of a short message, and the short message includes at least one of the following: a public warning system notification or system information modification information. Then, the user equipment obtains the short message from the power saving message. In this way, when the user equipment is in a connected state, the user equipment may obtain the short message by using the power saving message, for example, a PoSS, instead of by monitoring a paging PDCCH; and when the UE is in a sleep state, the UE is not woken up to monitor the paging PDCCH. This reduces power consumption of the user equipment in the connected state.