UE Wake-Up Signal Detection for DRX Power Optimization
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing discontinuous reception (DRX) in 5G communication systems, particularly in managing power consumption and optimizing signal monitoring in both idle and connected modes.
Innovation Solution
The implementation of a wake-up signal (WUS) detection method in user equipment (UE) to determine whether to monitor the physical downlink control channel (PDCCH) or a paging message for specific time occasions, allowing for reduced power consumption by minimizing unnecessary monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of PDCCH is performed to ensure reliable signal reception, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) where the UE alternates between active monitoring periods and sleep periods. During active periods, the UE monitors PDCCH for downlink assignments; during sleep periods, monitoring is suspended to conserve power. This periodic action resolves the contradiction by providing reliable signal reception only when necessary while reducing power consumption during idle periods.
Solution Approach 2:
The UE autonomously determines when to wake up and monitor PDCCH based on pre-configured DRX parameters and received wake-up signals, without requiring continuous network control. This self-service mechanism allows the UE to manage its own power consumption while maintaining reliable reception by waking up only when downlink data is likely to be transmitted.
2Speed
If frequent PDCCH monitoring is performed to quickly detect downlink assignments, then speed is improved, but power consumption increases
Solution Approach 1:
The network sends wake-up signals to the UE before the actual downlink data transmission. The UE monitors for these wake-up signals during active periods and can quickly respond when detected. This preliminary action allows fast detection of downlink assignments when needed while avoiding continuous monitoring that would waste power during periods when no data is transmitted.
3Use of energy by moving object
If DRX cycle length is increased to reduce power consumption, then power consumption is reduced, but response time increases
Solution Approach 1:
The patent implements dynamic DRX cycle adjustment where the UE can switch between short DRX cycles and long DRX cycles based on traffic conditions. Short DRX cycles provide faster response time for active traffic, while long DRX cycles reduce power consumption for idle periods. This dynamic adjustment resolves the contradiction by adapting the DRX cycle length to current network conditions and traffic patterns.
Data Source
AI summary
The present disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a data transmission rate higher than that of a 4th generation (4G) communication system such as long term evolution (LTE). The present disclosure provides a method and an apparatus for performing discontinuous reception (DRX) in a wireless communication system. An operating method of a user equipment (UE) in a wireless communication system includes detecting a wake-up signal (WUS), and determining whether to a physical downlink control channel (PDCCH) or a paging message for a specific time occasion based on the WUS.