V2X Reference Resource Selection Using SCI and SL-RSRP
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Solution Overview
Problem
In the context of Vehicle-To-Everything (V2X) systems, there is a challenge in determining a reference resource set for terminals to assist each other in resource selection during the second transmission mode, which leads to issues like hidden nodes, half-duplex, exposed nodes, and high power consumption.
Innovation Solution
A first terminal determines a resource pool and, using Sidelink Control Information (SCI) and Sidelink Reference Signal Received Power (SL-RSRP), excludes resources to create a reference resource set adaptable or not adaptable for a second terminal, which is then indicated to assist in resource selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If terminals autonomously select transmission resources in the second transmission mode, then transmission flexibility and autonomy are improved, but transmission reliability deteriorates due to hidden node interference, half-duplex limitations, and exposed node problems
Solution Approach 1:
The patent introduces a base station as an intermediary to allocate reference resource sets to terminals. This mediator resolves the contradiction by providing centralized coordination (improving reliability) while maintaining the autonomous selection mechanism (preserving automation). The base station acts as a mediator that guides terminal resource selection without completely taking over the process.
Solution Approach 2:
The patent applies preliminary action by having the base station pre-allocate reference resource sets to terminals before actual data transmission. This preliminary resource allocation establishes a foundation for reliable communication while allowing terminals to autonomously select specific resources within the pre-defined sets, thus resolving the reliability-automation contradiction.
2Device complexity
If terminals autonomously select resources without assistance, then system complexity is reduced, but resource utilization efficiency deteriorates due to interference and collisions
Solution Approach 1:
The patent segments the resource pool into multiple reference resource sets, each allocated by the base station to specific terminals or terminal groups. This segmentation reduces terminal complexity (each terminal only needs to select from its assigned set) while improving overall resource utilization efficiency through base station coordination that prevents collisions and interference.
3Reliability
If terminals perform comprehensive resource sensing and selection, then transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies partial action by having terminals select resources only from the base station-allocated reference resource sets rather than performing comprehensive sensing of the entire resource pool. This partial resource selection maintains transmission reliability within the allocated sets while significantly reducing the energy consumption associated with exhaustive resource sensing and selection.
Data Source
AI summary
A method for determining a reference resource includes: a first terminal determines a resource pool where a reference resource set is located, and determines, in a resource selection window, a first resource set belonging to the resource pool; the first terminal excludes resources from the first resource set based on detected Sidelink Control Information (SCI) and a measured Sidelink Reference Signal Received Power (SL-RSRP) to obtain a second resource set, where the second resource set is a resource set adaptable to be used by a second terminal; and the first terminal indicates the second resource set to the second terminal.