Sidelink Resource Selection Using Terminal Feedback and Sensing
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Solution Overview
Problem
In sidelink communication systems, especially in 5G networks, resource selection for V2X communications faces challenges due to hidden node, exposed node, and half-duplex operation problems, leading to collisions and inefficiencies in resource utilization.
Innovation Solution
A method and apparatus for resource selection in sidelink communication, where a terminal receives resource set information from another terminal and performs resource selection based on this information, or independently through sensing, to determine candidate resources for transmission, considering preferred or not-preferred resource sets, intersections, differences, or unions, and adjusts based on distance and DRX operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminals perform autonomous resource selection in mode 2 sidelink communication, then resource allocation flexibility is improved, but collision probability increases due to hidden node, exposed node, and half-duplex operation problems
Solution Approach 1:
Terminals perform sensing operations in advance to identify suitable resources before actual data transmission. The terminal determines candidate resources within a sensing window and selection window before transmitting data, allowing proactive resource reservation and conflict avoidance. This preliminary resource identification reduces collisions by ensuring terminals are aware of upcoming transmissions and can adjust their resource selection accordingly.
Solution Approach 2:
The system implements feedback mechanisms where terminals exchange resource selection information and sensing results. Terminals monitor the sidelink channel for transmissions from other terminals and adjust their own resource selection based on observed channel conditions and other terminals' resource usage patterns. This feedback loop enables dynamic resource adaptation and collision avoidance through inter-terminal coordination.
2Measurement precision
If terminals perform sensing operations to determine candidate resources, then resource selection accuracy is improved, but communication latency increases due to the additional sensing and selection time required
Solution Approach 1:
Terminals perform sensing operations and identify candidate resources in advance within predefined sensing and selection windows. By determining suitable resources before actual data transmission is needed, the system prepares resource allocations proactively, reducing the time required at the moment of transmission and thereby minimizing communication latency while maintaining selection accuracy.
Solution Approach 2:
The sensing window and selection window parameters can be dynamically adjusted based on channel conditions, traffic patterns, and QoS requirements. This dynamic configuration allows the system to adapt the sensing and selection duration to balance between selection accuracy and latency requirements, optimizing performance for different operational scenarios.
Data Source
AI summary
A method and a device for resource selection based on mode 2 in sidelink communication are disclosed. An operating method of a first terminal includes the steps of: receiving first resource set information from a second terminal; selecting a candidate resource on the basis of a first resource set indicated by means of the first resource set information and/or a second resource set determined by means of a resource sensing operation performed in the first terminal; and performing sidelink communication on the basis of the candidate resource.