Sidelink RB-Set Selection to Reduce PAPR and Fragmentation
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Solution Overview
Problem
Existing sidelink communication technologies face challenges in accessing unlicensed channels reliably, leading to uneven wireless traffic load, high peak-to-average power ratio (PAPR) issues, and fragmentation of frequency resources, especially in unlicensed spectrum bands, which affect communication performance and reliability.
Innovation Solution
A resource selection method for sidelink communication that involves selecting consecutive resources from resource block (RB) sets, prioritizing resources within a channel occupancy time (COT), performing channel busy ratio (CBR) measurements, and utilizing edge RB sets to optimize channel access and resource utilization, thereby reducing PAPR and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resources are selected randomly from available resource blocks for sidelink transmission, then resource allocation flexibility is improved, but frequency resource fragmentation occurs and PAPR increases
Solution Approach 1:
The resource pool is segmented into multiple Resource Block (RB) sets, and the method selects consecutive RB sets for sidelink transmission. This segmentation approach maintains flexibility in choosing from multiple RB sets while ensuring continuity within each selected set, thereby resolving the contradiction between allocation flexibility and resource continuity.
Solution Approach 2:
The method changes the selection parameter from random individual RB selection to selecting consecutive RB sets. This parameter change ensures that resources are allocated in continuous frequency blocks, reducing PAPR and avoiding fragmentation while maintaining the ability to adapt to different transmission requirements by choosing different RB set combinations.
2Productivity
If resources are selected from different RB sets in the same slot for simultaneous transmission, then resource utilization is improved, but PAPR issues worsen
Solution Approach 1:
The transmission resources are segmented into time slots, with each slot dedicated to a single RB set. This temporal segmentation prevents simultaneous transmission from multiple RB sets, thereby eliminating PAPR issues while still achieving high resource utilization through efficient time-division multiplexing of different RB sets.
3Measurement precision
If LBT failure reporting is performed for each individual RB set, then channel access accuracy is improved, but signaling overhead increases
Solution Approach 1:
LBT failure reporting is merged at the RB set level rather than being reported for each individual resource within an RB set. This combining approach maintains accurate channel access measurement at the RB set granularity while significantly reducing signaling overhead, as multiple resources within the same RB set share a single failure report.
Data Source
AI summary
A resource selection method for sidelink communication by a UE includes performing resource selection based on at least one of followings: selecting resources from consecutive RB sets for sidelink transmission, avoid selecting resources in a same slot from different RB sets for simultaneous transmission, selecting resources in consecutive time slots within a COT duration and within a same RB set, prioritizing or selecting resources for sidelink transmission within a self-initiated COT of the UE or a shared COT from another UE and within a same RB set as the self-initiated COT or the shared COT when a priority class of the sidelink transmission is equal to or larger than the self-initiated COT or the shared COT, performing CBR and/or a channel CR measurements per RB set and prioritizing/selecting a less loaded/congested RB set with lower measured CBR and/or CR values based on the CBR and/or the CR measurements, etc.