Sidelink Resource Reselection for NR V2X Retransmissions
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Solution Overview
Problem
Existing V2X communication systems, particularly in NR V2X, face challenges in supporting multiple retransmissions and resource reselection for aperiodic services, as current solutions do not adequately address how to reselect sidelink resources when initial selections become unavailable or preempted.
Innovation Solution
A method and apparatus for sidelink resource reselection involving resource re-evaluation and pre-emption checks to determine and reselect sidelink resources based on time-frequency characteristics of initially selected resources, ensuring multiple retransmissions and reservations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NR V2X supports multiple retransmissions with autonomous resource selection, then transmission reliability is improved, but resource management complexity increases
Solution Approach 1:
The terminal performs sensing and resource selection in advance to determine candidate resources for multiple transmissions. By pre-selecting resources based on sensed channel conditions and predicting future resource availability, the system prepares transmission resources before actual data transmission occurs, reducing real-time decision complexity while ensuring reliable retransmission opportunities
Solution Approach 2:
The terminal continuously monitors sidelink channel conditions and resource availability, using this feedback to adjust and reselect resources for retransmissions. The sensing mechanism provides ongoing information about channel quality and occupied resources, enabling dynamic resource adaptation that maintains reliability without requiring complex centralized coordination
2Stability of the object's composition
If resource reselection is performed when initial resources are unavailable, then transmission continuity is improved, but signaling overhead increases
Solution Approach 1:
The terminal autonomously performs resource reselection when initial resources become unavailable, without requiring network device intervention or additional signaling. The sensing mechanism enables the terminal to independently identify alternative resources and execute reselection, maintaining transmission continuity while avoiding the signaling overhead that would result from network-coordinated resource reallocation
3Measurement precision
If sensing window and selection window are extended to support multiple retransmissions, then resource selection accuracy is improved, but time delay increases
Solution Approach 1:
The terminal performs sensing over a extended window to gather sufficient information for multiple retransmission decisions, accepting some additional time expenditure to ensure accurate resource selection. By collecting more sensing data before making resource decisions, the system achieves better resource selection accuracy that reduces the need for subsequent reselection operations, ultimately improving overall transmission efficiency
Data Source
AI summary
A sidelink resource reselection method and apparatus. The method includes performing resource re-evaluation and/or pre-emption check on sidelink resources initially selected for performing a plurality of times of transmission of a transport block, and reselecting at least one sidelink resource from a sidelink resource set in a case where one or more sidelink resources are not in a reselection candidate resource set, wherein a currently reselected sidelink resource set is determined according to time frequency sources of the initially selected sidelink resources.