Wake-Up Signal Paging for Low-Power RRC Inactive Monitoring
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Solution Overview
Problem
5G devices face high power consumption in RRC_CONNECTED and RRC_INACTIVE states, which affects battery life and latency, necessitating a power-saving mechanism that supports low latency and long battery life.
Innovation Solution
Implementing a low power receiver (LPR) that alternates with a main radio (MR) to conserve power by only activating the MR when necessary, using a wake-up signal for triggering data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UEs wake up periodically once per DRX cycle, then power consumption is dominated in periods with no signalling or data traffic, but if UEs wake up only when triggered by paging, then power consumption is significantly reduced
Solution Approach 1:
The network sends a wake-up signal (WUS) before the actual paging message to preliminarily notify the UE to wake up. This allows the UE to prepare for receiving the paging message without having to continuously monitor the paging channel, thereby reducing power consumption while maintaining timely response to paging events.
Solution Approach 2:
A wake-up signal acts as an intermediary between the network and the UE before the actual paging message is transmitted. The WUS is a simplified signal that the UE can detect with lower power consumption, and upon detecting the WUS, the UE then activates its main receiver to receive the full paging message, thus reducing overall power consumption while maintaining latency requirements.
2Duration of action of stationary object
If eDRX cycle with large value is used to meet longer battery life requirements, then battery life is extended, but latency increases which is not suitable for services with low latency requirements
Solution Approach 1:
The system dynamically adjusts the UE's wake-up behavior based on the wake-up signal. Instead of using a fixed large eDRX cycle that always results in high latency, the UE can wake up earlier when a WUS is detected, thereby dynamically optimizing the balance between battery life and latency based on actual network conditions and service requirements.
Solution Approach 2:
The wake-up signal is transmitted periodically at optimized intervals rather than relying on long eDRX cycles. This periodic WUS mechanism allows the UE to wake up at appropriate intervals to check for paging messages, achieving a balance between extending battery life through reduced wake-up frequency and maintaining low latency by waking up before actual paging events.
Data Source
AI summary
A solution for monitoring low power signal in RRC_INACTIVE state is provided. The solution provides means to switch between low power operation mode and normal operation mode. With this solution, the terminal stays in low power state as much as possible while keeping connectivity with the network that results in reduced battery power consumption.