Sidelink Radio Resource Allocation via Interference Estimation
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Solution Overview
Problem
Current radio resource management for sidelink wireless communication in mobile communication systems is inefficient, particularly in out-of-coverage scenarios where interference levels are high, leading to increased collision risks and reduced transmission success rates.
Innovation Solution
A method that estimates interference levels to dynamically select radio resources using pre-defined resources, decentralized coordination, or base station-based assignment, allowing vehicles to act as base stations in out-of-coverage scenarios, and employing techniques like listen-before-talk and forward error correction to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pre-defined radio resources are used for sidelink communication, then resource allocation is simple and fast, but collision probability increases in high interference scenarios
Solution Approach 1:
The patent implements dynamic resource allocation mode selection that adapts to changing interference conditions. The system transitions between mode 2(a) distributed scheduling and mode 2(d) centralized scheduling based on real-time traffic load and interference measurements, optimizing both resource utilization efficiency and transmission reliability under different operational conditions
Solution Approach 2:
The patent changes the operational parameters of resource allocation by switching between different scheduling modes (2a and 2d) and adjusting contention window sizes based on interference levels. This parameter adaptation allows the system to maintain high resource utilization while reducing collision probability in high interference scenarios
2Reliability
If decentralized coordination (listen-before-talk) is used for radio resource determination, then collision risk is reduced in moderate interference scenarios, but resource utilization efficiency decreases
Solution Approach 1:
The system dynamically switches between decentralized listen-before-talk mechanisms and centralized base station scheduling based on interference conditions. In low to moderate interference scenarios, decentralized coordination maintains good transmission success rates while preserving resource efficiency. In high interference scenarios, the system transitions to centralized scheduling to restore resource utilization efficiency
Solution Approach 2:
The patent segments the resource allocation approach into two distinct modes: mode 2(a) for decentralized coordination in moderate interference conditions, and mode 2(d) for centralized coordination in high interference conditions. This segmentation allows each mode to be optimized for its specific operational context, balancing reliability and efficiency
3Reliability
If base station-based assignment is used for radio resources, then transmission reliability is high in in-coverage scenarios, but the system becomes dependent on base station availability
Solution Approach 1:
The patent creates a universal resource allocation framework that functions across multiple operational scenarios. The system can operate in base station-controlled mode (mode 2d) when coverage is available, and seamlessly transition to autonomous vehicle-to-vehicle scheduling mode when out of coverage. This multi-functionality ensures high transmission reliability in in-coverage scenarios while maintaining adaptability to out-of-coverage scenarios
Solution Approach 2:
The patent introduces an intermediary mechanism that enables vehicles to act as temporary base stations when the actual base station is unavailable. This intermediary functionality allows the decentralized mode 2(d) to provide base station-like resource assignment capabilities in out-of-coverage scenarios, maintaining transmission reliability without base station dependency
Data Source
Figure 1a~1c
Figure 2a~2b
AI summary
The present invention relates to an apparatus, a method and a computer program for determining one or more radio resources to be used for performing a wireless communication over a sidelink of a mobile communication system. The method comprises estimating a level of interference. The method comprises selecting a means for determining the one or more radio resources based on the level of interference. The means is selected among elements of the group of using pre-defined radio resources, using a decentralized coordination of radio resources, and using a base station-based assignment of radio resources. The method comprises determining the one or more radio resources to be used for performing a wireless communication over the sidelink of the mobile communication system based on the selected means.