Sidelink DRX Resource Reservation for NR V2X HARQ Retransmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing resource allocation and retransmission in sidelink (SL) communication, particularly in vehicle-to-everything (V2X) scenarios, due to the overhead caused by increasing data traffic and the need for enhanced mobile broadband communication.
Innovation Solution
A method for performing resource selection and retransmission in SL discontinuous reception (DRX) based on a SL DRX configuration, utilizing hybrid automatic repeat request (HARQ) feedback for efficient resource utilization and retransmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If SL DRX configuration is used to reduce power consumption and overhead, then energy efficiency is improved, but resource allocation complexity increases
Solution Approach 1:
The transmitting UE performs resource selection and reserves resources in advance within the active time window before the receiving UE enters sleep mode. This preliminary resource allocation ensures that retransmissions can occur without requiring the receiving UE to remain active, thereby reducing power consumption while maintaining manageable resource allocation complexity through advance planning
Solution Approach 2:
The system dynamically adjusts resource allocation based on DRX active time windows. The transmitting UE identifies and selects resources that fall within the receiving UE's active time, creating a dynamic resource allocation scheme that adapts to the receiving UE's sleep-wake pattern. This dynamic approach optimizes energy efficiency while keeping resource management tractable through time-window-based constraints
2Reliability
If resource selection is performed within active time only, then retransmission reliability is improved, but resource availability decreases
Solution Approach 1:
The system introduces a time dimension constraint by limiting resource selection to active time windows. Instead of selecting from all available resources in time-frequency space, the transmitting UE selects resources that satisfy the additional temporal constraint of falling within the receiving UE's active time. This dimensional constraint ensures retransmission reliability while the system compensates for reduced resource availability by optimizing selection within the constrained space and potentially using multiple DRX cycles
3Reliability
If DRX active time is extended to accommodate retransmissions, then retransmission success rate is improved, but latency increases
Solution Approach 1:
The transmitting UE performs preliminary resource selection within the active time window and reserves these resources in advance. By selecting and reserving retransmission resources before the DRX cycle ends, the system ensures that retransmissions can occur immediately when needed without extending the active time, thereby maintaining low latency while achieving high retransmission success rates
Solution Approach 2:
The transmitting UE autonomously identifies suitable retransmission resources within the active time window and performs resource reservation without requiring network intervention or extending the receiving UE's active time. This self-service approach allows the system to achieve reliable retransmissions through intelligent resource selection and reservation, maintaining both low latency and high success rates
Data Source
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AI summary
Disclosed is a method for operating a first device (100) in a wireless communication system. The method may comprise the steps in which: resource selection for a resource included in an active time of a sidelink (SL) discontinuous reception (DRX) configuration is performed on the basis of a second device (200) performing SL communication on the basis of the SL DRX configuration; and information related to the resource selected on the basis of the resource selection is transmitted to the second device (200).