UE Multi-Slot Resource Selection for Consecutive SL-U Transmissions
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Solution Overview
Problem
In sidelink unlicensed (SL-U) systems, UEs face challenges in efficiently selecting resources for multiple consecutive slots (MCSt) due to the need for Listen Before Talk (LBT) procedures, which can lead to difficulties in retaining channel occupancy and ensuring consecutive slot transmissions.
Innovation Solution
A UE is equipped with a first layer that receives parameters for resource selection, determines candidate multi-slot resources based on candidate resource block sets, and reports these resources to a higher layer, considering factors like RSRP thresholds and the selected resources for other TBs to optimize resource allocation for MCSt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT procedure is performed before each transmission in SL-U system, then channel access reliability is improved, but transmission continuity deteriorates due to frequent LBT requirements
Solution Approach 1:
The UE performs resource selection and acquires COT in advance for multiple consecutive slots before actual data transmission. This preliminary acquisition of channel occupancy allows the UE to skip LBT procedures during the reserved COT period, ensuring transmission continuity while maintaining reliable channel access through the initial LBT-based COT acquisition.
2Adaptability or versatility
If resource selection is performed for each slot independently, then resource allocation flexibility is improved, but LBT frequency increases reducing transmission efficiency
Solution Approach 1:
The patent merges multiple slot resource selections into a single multi-slot resource selection process. The UE selects a COT spanning multiple consecutive slots in one operation, then uses this unified COT for transmissions across all included slots. This combining approach reduces LBT frequency while preserving flexibility through the ability to select different COT durations and slot configurations.
3Productivity
If COT is retained for multiple consecutive slots, then LBT frequency is reduced improving efficiency, but resource selection complexity increases
Solution Approach 1:
The patent segments the multi-slot resource selection process into distinct phases: (1) receiving higher layer parameters including MCSt configuration, (2) determining candidate single-slot resources based on RSRP thresholds, (3) selecting candidate multi-slot resources from combinations of single-slot resources, and (4) reporting to higher layers. This segmentation manages complexity by breaking down the otherwise overwhelming multi-slot selection into manageable sequential steps.
Data Source
AI summary
The present application relates to methods and apparatuses for resource selection. An embodiment of the present disclosure provides a UE for resource selection, comprising: a first layer; and a higher layer; wherein the first layer is to: receive a set of parameters from the higher layer associated with resource selection for a first transport block (TB); select a set of candidate multi-slot resources for the first TB, wherein a candidate multi-slot resource of the set of candidate multi-slot resources is selected based on a group of candidate RB sets associated with each candidate single-slot resource in the candidate multi-slot resource, or based on a selected resource for a second TB; and report the set of candidate multi-slot resources to the higher layer.