Sidelink DRX Timer Configuration for UE Power Management
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G/NR, face challenges in efficiently managing sidelink discontinuous reception (DRX) operations, which affect the monitoring and skipping of physical sidelink control and shared channels, leading to suboptimal resource utilization and increased power consumption.
Innovation Solution
The implementation of a user equipment (UE) that configures and manages sidelink DRX timers based on received sidelink control information, allowing for the monitoring or skipping of sidelink channels, thereby optimizing resource allocation and reducing unnecessary receptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first UE continuously monitors the second PSCCH and second PSSCH for sidelink communications, then the reliability of receiving sidelink data is improved, but the power consumption increases
Solution Approach 1:
The first UE implements discontinuous reception (DRX) operations by periodically monitoring the second PSCCH and second PSSCH based on configured DRX cycles, instead of continuous monitoring. The UE alternates between active monitoring periods and sleep periods, achieving periodic action that reduces power consumption while maintaining reliable data reception during active phases
Solution Approach 2:
The first UE dynamically adjusts its monitoring behavior by configuring SL DRX timers (drx-OnDurationTimer, drx-InactivityTimer, drx-RetransmissionTimer) based on received SCI information. The monitoring activity level changes dynamically according to traffic conditions and timer states, transitioning between active and inactive states to balance reliability and power consumption
2Reliability
If the first UE monitors all sidelink channels for all source and destination IDs, then the completeness of receiving communications is improved, but the resource utilization decreases
Solution Approach 1:
The first UE segments its monitoring responsibilities by configuring separate SL DRX timers for each pair of source ID and destination ID. Instead of uniform monitoring for all communications, the UE divides monitoring resources according to specific communication pairs, enabling selective monitoring that improves resource utilization while maintaining completeness for relevant communications
Solution Approach 2:
The first UE applies different monitoring qualities to different source-destination pairs by configuring specific DRX parameters (onDurationTimer, inactivityTimer, retransmissionTimer) for each pair. High-priority or active communication pairs receive more intensive monitoring resources, while inactive pairs receive reduced monitoring, achieving local quality differentiation that optimizes overall resource utilization
Data Source
AI summary
Methods and apparatuses in a wireless communication system. A method of a first UE comprises: receiving, from a second UE, a first PSCCH and a first PSSCH, wherein the first PSCCH and the first PSSCH include SCI comprising a source ID, a destination ID, and SL DRX time information indicating when the first UE monitors or skips at least one of a second PSCCH and a second PSSCH for the SL DRX operation; configuring SL DRX timers per pair of the source ID and the destination ID; configuring a value of at least one of the SL DRX timers based on information of the SCI; and receiving the at least one of the second PSCCH and the second PSSCH based on the SL DRX timers when the SL DRX operation is applied to a SL communication identified by the pair of the source ID and destination ID.