Wake-Up Receiver Sub-Group Signaling for UE Power Reduction
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Solution Overview
Problem
As 5G mobile communication systems advance, there is a need to reduce power consumption in user equipment (UE) with wake-up receivers to extend battery life and improve operating time.
Innovation Solution
A method and apparatus for reducing power consumption in UE with a wake-up receiver by using a wake-up signal (WUS) for discontinuous reception (DRX), where the WUS includes information on sub-groups associated with the WUS, allowing the UE to monitor the WUS only during designated occasions while in DRX mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors for downlink control information, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent segments the UE into two functional parts: a wake-up receiver for low-power monitoring of wake-up signals, and a main receiver for full downlink control information processing. This segmentation allows the UE to maintain communication reliability through proper wake-up signaling while dramatically reducing power consumption by keeping the main receiver in a low-power state during DRX periods.
Solution Approach 2:
The patent implements periodic discontinuous reception (DRX) cycles where the UE periodically wakes up to check for wake-up signals and downlink control information, then returns to sleep mode. This periodic action maintains communication reliability through regular checks while reducing overall power consumption compared to continuous monitoring.
2Use of energy by moving object
If the UE uses DRX mode to save power, then power consumption is reduced, but the ability to respond timely to downlink data decreases
Solution Approach 1:
The patent uses wake-up signals as a preliminary indicator before full downlink control information is transmitted. The wake-up receiver detects these preliminary signals in advance during low-power periods, allowing the main receiver to be activated just in time to process actual downlink data, thus reducing response time while maintaining power savings.
Solution Approach 2:
The wake-up signal acts as an intermediary between the base station and the UE's main receiver. It serves as a trigger that bridges the gap between DRX power-saving mode and timely response, allowing the UE to transition from low-power state to active state only when necessary based on the wake-up signal indication.
3Productivity
If the UE wakes up frequently to check for data, then availability of data reception is improved, but power consumption increases
Solution Approach 1:
The wake-up receiver performs self-service by autonomously detecting wake-up signals and generating corresponding wake-up indications without requiring the main receiver to be active. This allows the UE to self-determine when full data reception is needed based solely on wake-up signal detection, improving data reception availability while minimizing power consumption by keeping the main receiver in low-power state during DRX periods.
Data Source
AI summary
The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving, from a base station, configuration information associated with a wake-up signal (WUS) for a discontinuous reception (DRX) and monitoring the WUS within an occasion for the WUS based on the configuration information, while a group including the UE is in a DRX mode, wherein the WUS includes information on at least one sub-group associated with the WUS among the group.