NR V2X Resource Selection for Half-Duplex and PA Phase Discontinuity
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Solution Overview
Problem
The NR V2X technology's flexible parameter set configuration is affected by half-duplex issues and limited Power Amplifiers (PAs), leading to phase discontinuity and reduced system performance when coexisting with LTE V2X and supporting multi-carrier transmission.
Innovation Solution
A resource selection method that excludes slot resources causing PA phase discontinuity and prioritizes transmitting resources on slot resources with consistent starting and ending points, ensuring the UE can handle the number of PAs, and selects resources based on parameter sets with the smallest slot length to minimize half-duplex impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flexible parameter set configuration is used for multi-carrier transmission, then transmission efficiency is improved, but half-duplex limitations cause slot resources to be lost and system performance deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-determining the parameter set with the smallest slot length before resource selection. This allows the system to proactively identify and use the most time-efficient parameter set, thereby maximizing transmission efficiency while minimizing the impact of half-duplex limitations on system performance.
Solution Approach 2:
The patent changes the parameter set configuration by selecting the parameter set with the smallest slot length. This parameter change optimizes the time domain resources, allowing the system to achieve higher transmission efficiency while reducing the negative effects of half-duplex constraints on overall system performance.
2Device complexity
If Power Amplifiers are shared across multiple carriers, then device complexity is reduced, but phase discontinuity occurs and transmission reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-selecting slot resources with consistent starting and ending points before transmission. This ensures that when Power Amplifiers are shared across multiple carriers, the phase discontinuity issue is avoided by choosing time-aligned resources, thereby maintaining transmission reliability while keeping device complexity low.
Solution Approach 2:
The patent applies local quality by requiring slot resources to have consistent starting and ending points specifically for carriers sharing Power Amplifiers. This localized constraint ensures phase continuity only where needed (at PA boundaries) while allowing flexibility elsewhere, maintaining transmission reliability without significantly increasing device complexity.
3Adaptability or versatility
If slot resources with different starting and ending points are used, then resource flexibility is improved, but PA phase discontinuity increases and system performance deteriorates
Solution Approach 1:
The patent applies local quality by imposing the consistency constraint only on slot resources that share Power Amplifiers. This allows resource flexibility to be maintained for carriers with independent PAs while ensuring phase continuity where PAs are shared, thereby preventing system performance deterioration due to phase discontinuity.
Solution Approach 2:
The patent changes the resource selection criteria by requiring consistent starting and ending points for slot resources. This parameter change restricts the flexibility option to only those cases where it does not cause phase discontinuity, thereby maintaining system performance while preserving adequate resource flexibility.
4Ease of manufacture
If resource selection does not consider UE PA capabilities, then resource allocation simplicity is maintained, but transmission reliability deteriorates due to phase discontinuity
Solution Approach 1:
The patent applies local quality by applying the consistency constraint only to slot resources that share Power Amplifiers. This targeted approach maintains resource allocation simplicity for the overall system while ensuring transmission reliability specifically at the PA sharing boundaries, where phase discontinuity would otherwise occur.
Solution Approach 2:
The patent changes the resource selection parameters by adding the consistency requirement for slot resources. This parameter change maintains simplicity in the overall allocation process while improving transmission reliability by eliminating phase discontinuity issues in PA-shared scenarios.
Data Source
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AI summary
The present application relates to the technical field of wireless communications, and in particular to a resource selection method and apparatus, a terminal and a storage medium. The method involves: when a plurality of service packets arrive, for each service packet, if the number of candidate resource sets obtained by the current service data is at least two, determining a target resource set of the service packet; or when a plurality of service packets arrive, a UE sequentially selecting a sending resource in the corresponding target candidate resource set for each service packet, and before selecting the sending resource, excluding first time slot resources and determining second time slot resources, and preferentially selecting the sending resource in available resources on the second time slot resources. According to the present application, in a multi-carrier sending scene on an NR V2X direct link and a scene where NR V2X and LTE V2X coexist, the half-duplex effect can be reduced, and the problem of system performance degradation due to an insufficient quantity of power amplifiers (PA) can be solved.