NR V2X Sidelink DRX Resource Reselection for Retransmission Timing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing resource allocation and latency in sidelink (SL) communication, particularly in vehicle-to-everything (V2X) scenarios, which affect the reliability and capacity of direct UE-to-UE communication.
Innovation Solution
A method and device for performing sidelink (SL) discontinuous reception (DRX) configuration, resource pool management, and resource reselection to optimize the transmission of medium access control (MAC) protocol data units (PDUs) and sidelink control information (SCI) through physical sidelink channels, aligning active times to enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource reselection is performed during SL DRX operation, then resource allocation efficiency is improved, but active time duration is reduced causing retransmission failures
Solution Approach 1:
The transmitting UE performs resource selection in advance within the active time, and the resource selection window is configured to include future active times. This preliminary action ensures that resources are pre-selected before the current active time ends, allowing retransmissions to be scheduled in advance and ensuring the receiving UE is awake to receive them.
Solution Approach 2:
The system dynamically adjusts the resource selection window to extend into future active times based on the DRX configuration. The window is not fixed but adapts to the dynamic nature of DRX cycles, allowing resource reselection to occur in a way that respects the receiving UE's active/inactive schedule while maintaining allocation efficiency.
2Reliability
If resource reselection is triggered, then communication reliability is improved, but time consumption increases
Solution Approach 1:
Resource selection is performed in advance within the active time period, before any potential retransmission is needed. The transmitting UE selects resources and configures the resource selection window to include future active times, so that when retransmission is triggered, the resources are already prepared and the receiving UE will be awake to receive them, eliminating additional time delays.
Solution Approach 2:
The system uses HARQ feedback mechanisms where the receiving UE sends acknowledgment information back to the transmitting UE. This feedback loop allows the transmitting UE to adjust resource selection based on actual reception status, ensuring reliable communication while minimizing time consumption by only performing reselection when necessary based on feedback information.
Data Source
AI summary
Proposed is an operation method of a first device (100) in a wireless communication system. The method may comprise the steps of: selecting, in a resource selection window, a first resource and a second resource included in a first active time including the time when a timer, which is related to an SL DRX configuration of a second device (200) and to an active time included in the SL DRX configuration, was to have operated on the basis of reception performed on the basis of the first resource; and reselecting the first resource as a third resource in the resource selection window, wherein the third resource causes the second resource to be included in a second active time including the time when the timer related to the active time operates on the basis of reception performed on the basis of the third resource.