Sidelink CPE Position Selection for Collision-Resilient UE Transmission
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Solution Overview
Problem
When multiple user equipments (UEs) select the same sidelink (SL) transmission resource, their transmissions interfere with each other, leading to transmission failures.
Innovation Solution
The first UE selects one cyclic prefix extension (CPE) starting position from a plurality of CPE starting positions based on specific information, such as transmission priority, remaining packet delay budget, number of LBT failures, or CPE use scenario, to perform sidelink SL transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs select the same SL transmission resource, then resource utilization is improved, but transmission reliability deteriorates due to interference and collision
Solution Approach 1:
The patent segments the transmission resource by introducing multiple CPE starting positions (first CPE starting position and second CPE starting position) within the same SL transmission resource. This allows different UEs to select different starting positions for their transmissions, effectively dividing the resource into temporal segments while maintaining the overall resource allocation structure. This segmentation resolves the contradiction by enabling multiple UEs to share the resource without collision.
Solution Approach 2:
The patent applies dynamics by making the CPE starting position selectable and variable rather than fixed. Each UE can dynamically select its preferred CPE starting position based on its transmission characteristics and interference conditions. This dynamic selection mechanism allows the system to adapt to different transmission scenarios while maintaining resource utilization efficiency and avoiding collisions.
2Reliability
If CPE starting position is selected based on transmission priority, then transmission reliability is improved, but device complexity increases due to additional selection criteria
Solution Approach 1:
The patent applies parameter changes by using transmission priority as a key parameter to determine CPE starting position selection. Instead of complex multi-factor decision algorithms, the system changes the selection based on the priority parameter value - higher priority transmissions select certain starting positions while lower priority transmissions select other positions. This simple parameter-based approach improves reliability without significantly increasing device complexity.
Data Source
AI summary
A transmission position determining method includes selecting, by a first UE, one CPE starting position from a plurality of CPE starting positions based on first information, and performing SL transmission; wherein the first information includes a CPE use scenario.