V2X Resource Selection via RSSI Threshold and Random Re-evaluation
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Solution Overview
Problem
Existing V2X communication methods face increased resource collision probabilities due to aperiodic and variable data transmission, as they rely on sensing-based resource selection methods designed for periodic traffic, which are ineffective in future V2X communication scenarios with varying data amounts and transmission patterns.
Innovation Solution
A method for selecting resources in V2X communication that involves determining a threshold based on received signal strength indicator (RSSI) measurements during a first time interval, assessing resource status in a second time interval, and randomly selecting resources when idle, with periodic re-evaluation to prevent collisions, while maintaining a counter value when resources are busy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing-based resource selection method is used for V2X communication, then resource collision can be prevented for periodic traffic, but resource collision probability increases for aperiodic and variable data transmission
Solution Approach 1:
The patent applies dynamics by making the resource selection method adaptable to changing traffic conditions. The terminal dynamically adjusts its resource selection strategy based on whether traffic is periodic or aperiodic, transitioning from sensing-based selection for periodic traffic to random selection with periodic re-evaluation for aperiodic traffic. This dynamic adaptation resolves the contradiction between maintaining collision prevention reliability for periodic traffic and achieving versatility for aperiodic traffic patterns.
Solution Approach 2:
The patent changes key parameters of the resource selection method based on traffic characteristics. For periodic traffic, it uses sensing-based selection with specific sensing window parameters. For aperiodic traffic, it changes to random selection with different re-evaluation parameters and counter mechanisms. These parameter changes enable the system to maintain high reliability for periodic traffic while achieving adaptability for aperiodic traffic.
2Adaptability or versatility
If random resource selection is used for aperiodic data, then adaptability to variable traffic patterns is improved, but resource collision probability increases
Solution Approach 1:
The patent applies periodic action by implementing periodic re-evaluation of selected resources for aperiodic traffic. After initially selecting a resource randomly for aperiodic data transmission, the terminal periodically re-evaluates the resource status and maintains a counter. This periodic re-evaluation mechanism allows the system to maintain adaptability to aperiodic traffic patterns while reducing collision probability through periodic verification and potential reselection.
3Reliability
If sensing operation is performed to estimate future resources, then resource collision is prevented for periodic traffic, but system complexity increases for aperiodic traffic scenarios
Solution Approach 1:
The patent extracts the sensing operation from the universal resource selection process and applies it only to periodic traffic scenarios. For aperiodic traffic, the patent removes the complex sensing operation and replaces it with simpler random selection followed by periodic re-evaluation. This extraction resolves the contradiction by maintaining reliability through sensing where needed (periodic traffic) while reducing device complexity by eliminating unnecessary sensing operations for aperiodic traffic.
Data Source
AI summary
The present disclosure provides a method for selecting a resource for vehicle-to-everything (V2X) communication by a terminal in a wireless communication system, and a terminal using the method. The method comprises: determining a threshold by measuring a resource during a first time period; determining a resource state in a second time period on the basis of the threshold; and selecting a resource for V2X communication during the second time period on the basis of a determination result.