Sidelink DRX PSFCH Resource Management for V2X
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink communication resources, particularly in scenarios where vehicle-to-everything (V2X) user equipment (UEs) need to exchange information while operating in discontinuous reception (DRX) mode, which affects power consumption and the handling of physical sidelink feedback channels (PSFCH).
Innovation Solution
The proposed method involves a UE operation that configures and manages sidelink communication resources by obtaining DRX and PSFCH configuration information, transmitting sidelink shared channels, and requesting or receiving sidelink control information to handle PSFCH during active DRX times, optimizing resource selection and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE continuously monitors sidelink feedback channels to ensure reliable reception, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies discontinuous reception (DRX) where the UE alternates between active monitoring periods and sleep periods. During active periods, the UE monitors PSFCH resources; during sleep periods, it powers down relevant circuits. This periodic action maintains communication reliability during active phases while significantly reducing average power consumption overall.
Solution Approach 2:
The patent dynamically adjusts the UE's reception behavior based on DRX configuration parameters and current communication state. The UE transitions between different reception modes (continuous monitoring, periodic monitoring, sleep) depending on whether it is in active or inactive DRX periods, allowing adaptive power management while maintaining reliability when needed.
2Use of energy by moving object
If a UE operates in DRX mode to reduce power consumption, then energy efficiency is improved, but PSFCH reception may be missed during inactive periods
Solution Approach 1:
The patent configures PSFCH resources and DRX parameters in advance through RRC signaling or pre-configuration. This preliminary setup establishes predetermined active periods during which the UE will monitor PSFCH, ensuring that feedback reception opportunities are pre-planned and aligned with low-power operation goals without missing critical feedback.
Solution Approach 2:
The patent uses the PSFCH feedback mechanism itself to control the DRX behavior. When PSFCH feedback is successfully received during active periods, the UE can enter sleep mode with confidence. The feedback channel provides the information needed to determine when power saving is safe to activate, creating a closed-loop control system.
3Reliability
If a UE monitors all sidelink resources continuously, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the sidelink resource monitoring into distinct time periods (active and inactive DRX periods) and distinct resource types (PSFCH resources during active periods only). This segmentation allows the UE to focus monitoring efforts on specific resources during specific times, reducing the overall complexity of resource management while maintaining reliability through targeted monitoring.
Data Source
AI summary
The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting higher data rates. According to an embodiment of the disclosure, an operation method of a first user equipment (UE) for performing sidelink communication in a wireless communication system includes: obtaining discontinuous reception (DRX) configuration information; obtaining physical sidelink feedback channel (PSFCH) resource configuration information; transmitting a physical sidelink shared channel (PSSCH) to a second UE; transmitting, to the second UE, sidelink control information (SCI) including information requesting to transmit a PSFCH for the PSSCH; and receiving the PSFCH for the PSSCH from the second UE during a DRX active time when there is a slot for receiving the PSFCH in the DRX active time.