NR Sidelink Resource Selection Using Time Gap Constraints
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Solution Overview
Problem
In New Radio (NR) V2X sidelink communications, determining resource allocation to minimize interference between user equipment (UEs) is challenging, particularly in autonomous scheduling mode, where UEs need to select resources with minimal interference from other UEs.
Innovation Solution
The proposed solution involves determining a maximum time gap and a minimum time gap to ensure reserved resources are within a 32-slot window, accommodating HARQ round-trip time, and using these criteria to select and inform peer UEs about transmission resources via sidelink control information, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs autonomously select sidelink transmission resources in Mode 2, then resource allocation flexibility is improved, but interference between UEs increases
Solution Approach 1:
The UE performs sensing in a sensing window before the resource selection window to identify and exclude resources currently occupied by other UEs. This preliminary action of detecting and avoiding occupied resources reduces interference while maintaining autonomous resource selection flexibility.
Solution Approach 2:
The resource selection process incorporates feedback from sensing results, where the UE uses detected sidelink control information (SCI) from other UEs to adjust its resource selection. This feedback mechanism enables the UE to adapt its resource choices based on the current channel conditions and other UEs' transmissions, reducing interference.
2Reliability
If multiple transmission resources are selected for HARQ retransmissions, then reliability is improved, but resource consumption increases
Solution Approach 1:
The UE selects and reserves multiple transmission resources in advance within the resource selection window, including resources for potential HARQ retransmissions. This preliminary reservation ensures that reliable retransmission resources are available when needed, improving HARQ reliability.
Solution Approach 2:
The resource selection mechanism dynamically adapts the number of reserved resources based on channel conditions and traffic requirements. The UE can select between one or multiple transmission occasions, allowing flexible resource consumption that balances reliability needs with resource efficiency.
3Adaptability or versatility
If a resource selection window is defined to accommodate future transmissions, then resource reservation capability is improved, but time complexity increases
Solution Approach 1:
The time domain is segmented into distinct windows: a sensing window for detecting other UEs' transmissions, and a resource selection window for selecting transmission resources. This segmentation allows the UE to perform sensing and resource selection in an organized manner, improving resource reservation capability while managing time complexity through structured processing.
Data Source
AI summary
Various solutions for resource selection of multiple transmission occasions in new radio (NR) sidelink communications with respect to user equipment and network apparatus in mobile communications are described. An apparatus may select a first transmission resource from a resource selection window. The apparatus may determine a maximum time gap and a minimum time gap. The apparatus may select a second transmission resource according to the maximum time gap and the minimum time gap. The apparatus may inform the first transmission resource and the second transmission resource to a peer apparatus.