V2X Transmission Slot Selection for Signal Collision Avoidance
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Solution Overview
Problem
In vehicular V2X communication networks, collisions between wireless signals occur due to increased vehicle density and packet traffic, leading to channel congestion, packet loss, and delayed services, especially in urban areas and intersections.
Innovation Solution
An operation method for communication nodes that involves receiving information about a time period with multiple transmission slots, selecting a slot based on an index configured by the number of nearby communication nodes, data transmission rate, and message volume, and performing CSMA/CA to avoid collisions, with the option to reconfigure indices and change channel access modes as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If vehicle density and packet traffic increase in V2X communication networks, then communication coverage and data transmission volume increase, but signal collisions and channel congestion worsen
Solution Approach 1:
The synchronization interval is divided into multiple transmission slots (first transmission slot, second transmission slot, third transmission slot, etc.), each with assigned slot indices. Communication nodes select specific slots based on their packet priority and channel conditions, segmenting the transmission opportunity to reduce collisions. High priority packets use earlier slots while lower priority packets use later slots.
Solution Approach 2:
The system dynamically adjusts transmission parameters including selecting different slot indices based on packet priority, adjusting transmission power according to channel conditions, and modifying channel access modes (DCF, EDCA, or reserved slot) based on real-time network status. This dynamic adaptation allows the system to optimize performance under varying traffic conditions.
2Ease of operation
If traditional CSMA/CA is used for channel access, then simplicity and ease of operation are maintained, but channel access efficiency and reliability deteriorate under high traffic conditions
Solution Approach 1:
Transmission slots are pre-configured with specific indices and priorities before communication occurs. The system establishes a predetermined structure where slot indices are assigned based on packet priority levels, allowing nodes to make efficient transmission decisions without complex real-time negotiations, thus improving channel access efficiency while maintaining operational simplicity.
3Device complexity
If transmission slots are not segmented, then device complexity is reduced, but signal collision and packet loss increase
Solution Approach 1:
The transmission medium is segmented into multiple time slots within each synchronization interval, with each slot assigned a specific index. This temporal segmentation allows multiple nodes to transmit simultaneously in different slots without collision, significantly improving transmission reliability. The segmentation is implemented through a standardized protocol that defines slot structures, maintaining manageable complexity.
Data Source
AI summary
An operation method of a first communication node for transmitting a message in a vehicle-to-everything (V2X) communication network is provided. The method includes receiving information regarding a time period including a plurality of transmission slots from a second communication node and selecting one transmission slot included in the time period based on a first index configured based on the information regarding the time period. A message is transmitted through the one transmission slot and the information regarding the time period includes information regarding a number of the plurality of transmission slots included in the time period.