Sidelink Resource Selection via Sensing Thresholds
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Solution Overview
Problem
Current V2X sidelink transmission schemes, such as LTE and NR, face limitations in resource allocation and scheduling, leading to inefficiencies in radio resource utilization and increased latency, particularly in grant-free transmission modes where UEs must autonomously select resources without explicit scheduling.
Innovation Solution
A method where a UE determines resource usage information by measuring signals from other UEs and excludes resources from consideration if they exceed usage thresholds, selecting alternative resources to minimize collisions and optimize resource utilization for sidelink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If UEs autonomously select resources without explicit scheduling (grant-free transmission), then scheduling latency is reduced and scheduling overhead is minimized, but resource collision probability increases and resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by performing sensing and resource selection in advance before actual transmission. UEs monitor and evaluate candidate resources beforehand, excluding resources that are likely to cause collisions based on sensed information from other UEs. This preliminary resource selection process ensures that when transmission occurs, the selected resources have already been validated for lower collision probability, thus resolving the contradiction between reduced scheduling latency and maintained reliability.
2Device complexity
If UEs autonomously select resources without explicit scheduling (grant-free transmission), then scheduling overhead is minimized, but resource utilization efficiency deteriorates due to increased resource waste from collisions
Solution Approach 1:
The patent implements feedback mechanisms where UEs continuously monitor the sidelink channel, decode SCI from other UEs, and use this sensed information to adjust their resource selection decisions. This feedback loop enables UEs to adapt to changing channel conditions and other UEs' transmission patterns, optimizing resource utilization by selecting resources that are currently less contested. The feedback mechanism resolves the contradiction by enabling intelligent resource selection without requiring complex centralized scheduling overhead.
3Reliability
If sensing procedure is performed to extract information from SCI decoding, then resource collision avoidance improves, but processing complexity and measurement requirements increase
Solution Approach 1:
The patent extracts only the essential information needed for resource selection from the complete SCI message. Instead of processing all SCI contents, the UE specifically extracts resource allocation information, sensing references signal (RSRP) values, and other critical parameters relevant to collision avoidance. This selective extraction approach maintains high reliability in collision avoidance by focusing on the most important sensing data while reducing processing complexity by ignoring unnecessary information.
Data Source
AI summary
Resource usage information is determined at a first UE about usage of a first communication resource by other UEs based on signals received by the UE. The first communication resource is excluded from a set of candidate communication resources when the resource usage information exceeds a usage threshold. When the first communication resource is excluded, a second communication resource from the candidate communication resources remaining in the set is selected to use for a transmission by the UE.