Sidelink Resource Exclusion Using SCI-Based Reservation Detection
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Solution Overview
Problem
In sidelink (SL) communication systems, transmission collisions among user equipments (UEs) are challenging due to autonomous resource selection, leading to inadequate resource availability, increased interference, and reduced communication performance and reliability.
Innovation Solution
A user equipment (UE) and sidelink resource exclusion method that identifies and excludes specific resources reserved by peer UEs, using sidelink control information (SCI) and predictive strategies to optimize resource selection, reducing unnecessary exclusions and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If UEs autonomously select SL resources in mode 2 without network assistance, then device independence and automation are improved, but transmission collisions and interference increase
Solution Approach 1:
The patent applies preliminary action by performing resource sensing and exclusion before actual resource selection. The UE senses the resource pool during a sensing window, identifies resources reserved by other UEs through SCI decoding, and excludes these resources from the candidate set before making its own resource selection. This preliminary detection and exclusion process prevents transmission collisions while maintaining autonomous operation.
2Reliability
If UEs exclude more resources from candidate set to avoid collisions, then transmission reliability is improved, but resource availability decreases
Solution Approach 1:
The patent implements feedback through the sensing mechanism where UEs continuously monitor the resource pool, decode SCI from other UEs, and use this information to update their candidate resource sets. The feedback loop allows UEs to adapt their resource selection based on actual channel conditions and reservations, excluding only the necessary resources while maintaining a sufficient pool of available resources for selection.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the candidate resource set based on sensed conditions. The UE modifies the composition of the candidate set by excluding resources identified through sensing, while maintaining the set size within acceptable ranges. This dynamic parameter adjustment ensures adequate resource availability while avoiding collisions.
3Measurement precision
If UEs monitor and sense resource allocation information during sensing window, then resource selection accuracy is improved, but processing complexity and time increase
Solution Approach 1:
The patent applies segmentation by dividing the resource pool into discrete resources that can be individually sensed, decoded, and excluded. The sensing window is structured to monitor specific time-frequency resources, and the candidate resource set is maintained as a separate entity from which exclusions are applied. This segmentation simplifies the sensing process by breaking it into manageable units.
4Object-generated harmful factors
If UEs perform resource exclusion based on detected SCI, then interference to other transmissions is reduced, but detection accuracy requirements increase
Solution Approach 1:
The patent applies preliminary anti-action by proactively excluding resources based on detected SCI before transmitting own data. By identifying and excluding resources reserved by other UEs in advance, the system prevents potential interference and collisions before they occur, rather than reacting to interference after it happens.
Data Source
AI summary
A user equipment (UE) and a sidelink resource exclusion method are provided. The sidelink resource exclusion method includes identifying a first sidelink resource selected by the UE or reserved by a peer UE in a first slot from a candidate resource set in a resource selection window and in a first sidelink resource pool and excluding the first sidelink resource and/or sidelink subchannels in the first slot from the candidate resource set. This can solve issues in the prior art, increase a number of available resources that can be selected from the remaining candidate resource set, reduce interference to other transmissions in the same sidelink resource pool, reduce probability of transmission (Tx) collisions with other UEs, provide a good communication performance, and/or provide high reliability.