NR Sidelink Resource Allocation for LTE Co-Channel Interference
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Solution Overview
Problem
The overlap of sidelink resource pools between different radio access technologies (RATs) such as LTE and NR can lead to interference and collisions, necessitating improved resource allocation methods to ensure efficient and collision-free sidelink communications.
Innovation Solution
A UE autonomously schedules resources in a Mode 2 resource allocation scheme, prioritizing resource selection in portions of the NR sidelink resource pool that do not overlap with LTE, using SL RSRP thresholds and configuration information to minimize interference, and ensuring a sufficient number of non-overlapping candidate resources are available for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink resource pools of multiple RATs are allowed to overlap to maximize resource utilization, then resource efficiency is improved, but interference and collisions between different RATs increase
Solution Approach 1:
The NR sidelink resource pool is segmented into overlapping and non-overlapping portions relative to LTE resource pools. The UE prioritizes selecting resources from the non-overlapping portion, effectively dividing the resource selection space to avoid interference while maintaining efficient utilization of available resources.
Solution Approach 2:
Different quality requirements are applied to different portions of the resource pool. Non-overlapping resources are treated as high-quality resources with priority selection, while overlapping resources are treated as lower-quality resources that are selected only when necessary. This local differentiation resolves the contradiction by optimizing resource selection based on interference characteristics.
2Adaptability or versatility
If UE autonomously schedules resources in Mode 2 allocation to improve flexibility and efficiency, then resource allocation adaptability is improved, but resource conflicts with other RATs increase
Solution Approach 1:
The UE performs preliminary identification of overlapping resource portions between NR and LTE sidelink resource pools before autonomous resource selection. By预先 knowing which resources overlap, the UE can prioritize non-overlapping resources in its autonomous scheduling decisions, maintaining flexibility while avoiding conflicts.
Solution Approach 2:
The UE uses SL RSRP thresholds and configuration information to make informed resource selection decisions. The autonomous scheduling mechanism incorporates feedback about resource overlap conditions and interference levels, allowing the UE to adaptively select resources that minimize conflicts while maintaining allocation flexibility.
Data Source
AI summary
Systems and methods for user equipment (UE) capable of performing sidelink (SL) communications that account for overlapped SL resource pools of multiple radio access technologies (RATs) are disclosed. A UE may select, based on prioritizing non-overlapped resources over overlapped resources, one or more candidate resources and/or one or more transmission resources; may determine a power control configuration without considering SL pathloss corresponding to a first RAT when a second power control configuration determination for a second RAT does not consider SL pathloss; may select physical sidelink feedback channel (PSFCH) locations for PSFCH use from first PSFCH locations of resources of a first SL resource pool on a first RAT that do not overlap with a second SL resource pool on a second RAT according to a bitmap; and/or may select one of a PSFCH transmission and PSFCH reception using a data priority rule and/or a pool sharing rule.