NR Sidelink Terminal Resource Selection via Inter-Terminal Feedback
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Solution Overview
Problem
In device-to-device (D2D) communication, particularly in NR sidelink, the challenge lies in improving delay performance and reliability, especially when resource selection is affected by resource collisions, and there is a lack of clarity on how to perform resource selection or reselection when an indication of resource collision is received from another terminal.
Innovation Solution
A terminal is equipped with a reception unit to receive information on preferred and non-preferred resources from multiple terminals, a control unit to select resources based on this information, and a transmission unit to use the selected resource for communication, allowing for autonomous resource selection and coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal autonomously selects resources in NR sidelink mode 2, then resource allocation flexibility is improved, but resource collision and reliability deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where terminals exchange resource status information and collision indications with neighboring terminals. The receiving terminal provides feedback about resource usage and collision detection, allowing the transmitting terminal to adjust its resource selection dynamically, thereby maintaining autonomy while improving reliability through coordinated resource management.
Solution Approach 2:
The patent introduces coordination messages as intermediary information exchange between terminals. These coordination messages serve as a mediator that carries resource status, collision indications, and selection preferences, enabling autonomous terminals to indirectly coordinate their resource choices without centralized control, thus resolving the contradiction between autonomy and collision avoidance.
2Reliability
If inter-terminal coordination is implemented in NR sidelink, then resource collision is reduced, but communication complexity increases
Solution Approach 1:
The patent segments the coordination process into distinct functional components: resource selection, collision detection, coordination message exchange, and resource confirmation. Each component handles a specific aspect of the coordination task, reducing overall complexity by breaking down the complex inter-terminal coordination into manageable, modular operations that can be processed independently.
Solution Approach 2:
The patent utilizes parameter changes in coordination messages to convey resource status and collision information efficiently. By encoding resource selection preferences, collision indications, and status updates as configurable parameters in standardized message formats, the system achieves effective coordination while maintaining manageable communication overhead and terminal processing complexity.
3Measurement precision
If sensing-based resource selection is performed, then resource selection accuracy is improved, but delay performance worsens
Solution Approach 1:
The patent implements preliminary resource selection based on available information before complete sensing data is obtained. Terminals can make preliminary resource choices using current knowledge and coordination messages, then refine or adjust selections as sensing information becomes available. This preliminary action reduces delay while maintaining acceptable accuracy through subsequent adjustments if needed.
Solution Approach 2:
The patent allows terminals to perform partial sensing on critical resources or use coordination message information as a substitute for complete sensing in certain scenarios. By performing sensing selectively on high-priority resources or using coordination information to supplement incomplete sensing data, the system achieves sufficient selection accuracy without the full time cost of exhaustive sensing across all resources.
Data Source
AI summary
A terminal includes: a reception unit configured to receive a plurality of information items indicating at least one of a preferred resource and a non-preferred resource in a resource pool from a plurality of terminals; a control unit configured to perform selection of a resource in the resource pool based on at least one of the plurality of information items; and a transmission unit configured to perform transmission using the selected resource. The control unit determines which one of the plurality of information items is to be applied to the selection of the resource.