NR Sidelink Resource Selection With CCA in Unlicensed Spectrum
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Solution Overview
Problem
Current sidelink resource selection techniques fail to adequately account for clear channel assessment (CCA) procedures in unlicensed spectrum, leading to inadequate resource allocation and synchronization issues between user equipment (UEs).
Innovation Solution
A UE performs a CCA procedure based on a configured grant provided by a base station, ensuring availability of sidelink resources in the unlicensed spectrum, and communicates resource allocation status to the base station and other UEs using HARQ protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If current sidelink resource selection techniques are used, then resource allocation is simplified, but resource conflicts and synchronization issues occur in unlicensed spectrum
Solution Approach 1:
The base station performs clear channel assessment (CCA) procedures before allocating sidelink resources in unlicensed spectrum. This preliminary action ensures the channel is clear before resource allocation, preventing resource conflicts and synchronization issues that would otherwise occur with simplified allocation methods.
Solution Approach 2:
The system implements feedback mechanisms where UEs report channel assessment results and resource allocation status to the base station. This feedback loop enables the base station to adjust resource allocations dynamically, ensuring reliable communication while managing complexity through centralized control based on real-time channel conditions.
2Reliability
If CCA procedures are performed for each sidelink resource, then resource allocation reliability improves, but system complexity and processing overhead increase
Solution Approach 1:
The base station acts as an intermediary that centralizes CCA procedure management. Instead of each UE independently performing CCA (which would increase overall system complexity), the base station performs assessments and coordinates resource allocation, reducing distributed processing overhead while maintaining allocation reliability through centralized control.
Solution Approach 2:
The base station performs multiple functions including CCA procedures, resource allocation, and coordination of multiple UEs through a single entity. This multi-functionality approach consolidates complexity management at one point while ensuring reliable resource allocation across all sidelink communications in the cell.
3Productivity
If resource allocation does not account for CCA procedures, then allocation speed increases, but synchronization issues occur between UEs
Solution Approach 1:
The base station performs CCA procedures as a preliminary step before finalizing resource allocation. This ensures that resources are assigned only after confirming channel availability, preventing synchronization conflicts while maintaining allocation speed through efficient pre-assessment and centralized coordination of multiple UEs.
Solution Approach 2:
The system uses feedback mechanisms where the base station monitors channel conditions and adjusts resource allocations in real-time. This feedback enables rapid adaptation to changing channel states, maintaining synchronization stability without sacrificing allocation speed through iterative optimization based on observed channel behavior.
Data Source
AI summary
Techniques, described herein, include solutions for enabling sidelink resource selection in an unlicensed spectrum. A first UE may receive a configured grant from a base station for specified sidelink resources. Additionally, or alternatively, a base station may have informed the UE of a pool of potential sidelink resources, and the UE may select suitable sidelink resources from the pool of resources. The UE may perform a listen-before-talk (LBT), clear channel assessment (CCA), or another type of sensing procedure to verify the availability of the selected resources. The UE may inform other UEs and/or the base station of the sidelink resource selection and use the sidelink resources for sidelink communications with another UE.