Sidelink Resource Indication for Hidden V2X Conflict Avoidance
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Solution Overview
Problem
In V2X communication systems, terminal devices independently selecting resources for data transmission may lead to resource conflicts when their transmission ranges do not overlap, causing inefficiencies and conflicts due to simultaneous resource selection.
Innovation Solution
A sidelink device provides indication and resource information to assist other devices in selecting available resources by using existing fields in sidelink control information, such as reserved bits or unused code points, to indicate reserved or excluded resources, reducing signaling overhead and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminal devices independently select resources for data transmission, then device autonomy and communication flexibility are improved, but resource conflicts occur when transmission ranges do not overlap
Solution Approach 1:
The patent applies preliminary action by having terminal devices perform sensing operations before resource selection to identify available resources. The first terminal device senses the resource pool, identifies resources not occupied by other devices, and pre-determines available resources before the second terminal device makes its selection. This advance preparation prevents resource conflicts by ensuring the second device selects from already-validated available resources rather than making independent selections that may overlap with the first device's transmission range.
2Measurement precision
If terminal devices perform sensing to identify available resources, then resource selection accuracy is improved, but transmission delay increases due to the sensing process
Solution Approach 1:
The sensing operation is performed in advance by the first terminal device before the second terminal device needs to select resources. The first device completes its sensing, determines the available resource pool, and this information is then used by the second device. This timing arrangement allows the sensing to occur without blocking the second device's resource selection, thereby maintaining high selection accuracy while minimizing the delay impact on the overall transmission process.
Solution Approach 2:
The first terminal device acts as an intermediary that performs the sensing operation on behalf of the resource pool for the second device. Instead of the second device performing its own sensing (which would double the sensing time and delay), the first device's sensing results are utilized by the second device. This intermediary approach maintains resource selection accuracy while significantly reducing the time loss by eliminating redundant sensing operations.
3Loss of energy
If existing fields in sidelink control information are used for indication, then signaling overhead is reduced, but information表达能力 (expression capability) is constrained
Solution Approach 1:
The patent applies parameter changes by reusing existing fields in the sidelink control information structure but changing their interpretation or content based on a trigger condition. When the trigger condition is met, these existing fields carry indication information about available resources instead of their original data. This allows the system to convey additional control information without adding new fields, thereby reducing signaling overhead while maintaining adaptability through flexible field repurposing.
Solution Approach 2:
The existing fields in the sidelink control information are designed to serve multiple functions. Normally, these fields carry standard control data, but under specific conditions (indicated by a trigger), they transition to carrying indication information about available resources. This multi-functionality allows the same fields to adapt to different communication needs without requiring separate dedicated fields, thus reducing overall signaling overhead while preserving the system's ability to express various types of information as needed.
Data Source
AI summary
A communication method and a sidelink device. The method includes: determining, by a first sidelink device, first indication information and first sidelink resource information; and sending, by the first sidelink device, the first indication information and the first sidelink resource information to a second sidelink device, where the first indication information indicates that the first sidelink resource information includes auxiliary information, and the auxiliary information is used to assist the second sidelink device in resource selection. After receiving the first indication information and the auxiliary information, the second sidelink device can learn about a surrounding related resource status, such as channel measurement information of a resource pool, and a resource occupation status of another communication device with which the second sidelink device cannot directly communicate. The second sidelink device may perform resource selection based on the auxiliary information.