Sidelink Resource Allocation via Dynamic Counter Thresholds
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Solution Overview
Problem
The semi-static resource reservation mode in sidelink communication systems leads to high resource collision rates and low resource utilization, especially when handling aperiodic services with shorter latency requirements in NR V2X communications.
Innovation Solution
A terminal device dynamically selects resources based on the occupancy status of transmission resources by adjusting counters and selecting target resources that meet specific conditions, such as unoccupied and interference-free, to improve resource allocation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the semi-static resource reservation mode is employed in NR V2X communications, then periodic services with fixed packet size can be supported, but resource utilization is reduced and resource collision rate increases for aperiodic services with latency less than 20 ms
Solution Approach 1:
The patent introduces a dynamic resource selection mechanism where the terminal device determines a first counter value and compares it with a first threshold to dynamically select between two resource allocation modes. This dynamic approach allows the system to adapt to different service types (periodic vs. aperiodic) and traffic conditions, resolving the contradiction between reliable periodic service support and efficient aperiodic service handling by enabling flexible resource utilization based on real-time requirements
2Duration of action of stationary object
If the semi-static resource reservation mode is employed with a minimum resource reservation period of 20 ms, then periodic services can be supported, but aperiodic services with latency requirements less than 20 ms cannot be accommodated efficiently
Solution Approach 1:
The patent segments the resource allocation process into two distinct paths based on the counter comparison result. When the first counter value exceeds the first threshold, the system performs sensing and selects from multiple candidate resources, enabling flexible resource selection with variable time intervals. This segmentation allows the system to break away from the fixed 20 ms reservation period and accommodate aperiodic services with latency requirements less than 20 ms while still supporting periodic services
3Reliability
If the terminal device performs sensing and selects target resource based on occupancy status, then resource collision rate is reduced, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies local quality by making the complex sensing and resource selection process conditional rather than universal. The terminal device only performs sensing and occupies a target resource when the first counter value exceeds the first threshold. For other cases, simpler resource allocation methods can be used. This conditional approach reduces the average device complexity and processing overhead while maintaining high resource allocation reliability when needed
Data Source
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AI summary
Embodiments of this disclosure provide a resource allocation method and a device. The method is applied to a terminal device in sidelink communication, and includes: determining a first numerical value of a first counter at a first occasion; in a case that the first numerical value is greater than a first preset value, determining an occupancy status of a first transmission resource associated with the first occasion, where the first preset value is an integer greater than or equal to 0; and selecting a target resource for information transmission based on the occupancy status of the first transmission resource.