Vehicular Wireless Communication Selective Position Data Transmission
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Solution Overview
Problem
High-vehicle-density scenarios lead to communication congestion in vehicle-to-vehicle (V2V) systems due to the transmission of multiple position information-items, which is unnecessary for determining relative positions between vehicles.
Innovation Solution
A vehicular wireless communication apparatus that includes a position acquisition portion, a communication portion, a subject-vehicle locus determination section, a rear vehicle determination section, and a transmission information control section, which selectively transmits necessary position information-items based on the subject vehicle's past locus and the rear vehicle's position, reducing data transmission while ensuring accurate position relation determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple position information-items are transmitted to enable rear vehicles to obtain position relation, then position relation determination accuracy is improved, but communication data volume increases causing congestion
Solution Approach 1:
The patent applies local quality by transmitting different amounts of position information to different vehicles based on their specific needs. Rear vehicles within the predetermined range receive multiple position information-items for accurate position relation determination, while other vehicles receive minimal information. This selective information transmission based on spatial relationship resolves the contradiction between providing sufficient position data and avoiding communication congestion.
Solution Approach 2:
The patent segments the communication data by dividing position information transmission into two categories: full position information sets for rear vehicles that need position relation determination, and minimal position information for other vehicles. This segmentation allows the system to provide comprehensive data where needed while minimizing overall communication volume, thus resolving the contradiction between accuracy and data volume.
2Reliability
If all vehicles transmit multiple position information-items, then position relation determination is enabled, but communication congestion occurs in high-vehicle-density scenarios
Solution Approach 1:
The patent applies partial action by having only the subject vehicle transmit multiple position information-items, while other vehicles transmit minimal information. This partial transmission approach ensures that rear vehicles can obtain position relation determination capability without requiring all vehicles to transmit full position data sets, thus maintaining reliability while improving communication efficiency in high-density scenarios.
Solution Approach 2:
The system implements local quality by providing enhanced position information transmission specifically at locations where rear vehicles are present and need position relation determination. Other areas without rear vehicles receive minimal transmission, optimizing overall communication efficiency while ensuring reliability where needed.
Data Source
AI summary
In a vehicular wireless communication apparatus in a subject vehicle, a rear vehicle determination process determines whether another vehicle is a rear vehicle within a predetermined range based on a past locus of the subject vehicle determined by a subject-vehicle locus determination process, and a locus information-set of the another vehicle received by a wireless communication portion. When the another vehicle is determined to be the rear vehicle, a necessary-position determination process determines position information-items of two end points of a line segment of the past locus of the subject vehicle which intersects with a perpendicular line drawn from a present position of the another vehicle. A simple transmission process transmits a locus information-set including (i) a present position information-item of the subject vehicle and (ii) the necessary-position information-item determined in the necessary-position determination process, from the wireless communication portion.