V2V Communication Control Device Adaptive Transmission Cycle
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Solution Overview
Problem
Vehicle-to-vehicle communication systems face challenges in balancing real-time information sharing with reduced communication charges, as direct wireless communication is affected by issues like hidden terminals and shadowing, while wide area networks incur high costs due to frequent data transmission.
Innovation Solution
A communication control device that employs both dedicated short-range and wide area communication modules, dynamically adjusting transmission cycles based on the presence of nearby vehicles to maintain real-time data sharing while minimizing network usage and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If vehicles transmit vehicle information packets frequently over the wide area communication network to share real-time vehicle information, then the real-time information sharing is improved, but the communication charges increase
Solution Approach 1:
The patent applies dynamics by making the transmission cycle adaptive rather than fixed. The wide area transmission cycle is dynamically adjusted based on whether peripheral vehicles are detected via direct communication. When peripheral vehicles are present, the system switches to a first transmission cycle optimized for real-time information sharing; when no peripheral vehicles are detected, it switches to a second, longer transmission cycle to reduce communication charges. This dynamic adaptation resolves the contradiction between real-time information sharing and communication cost reduction.
Solution Approach 2:
The patent changes the transmission cycle parameter based on communication conditions and vehicle presence. By monitoring the detection results of peripheral vehicles and adjusting the wide area transmission cycle parameter between two predetermined values (first and second transmission cycles), the system optimizes the balance between information freshness and communication cost, directly addressing the technical contradiction.
2Loss of energy
If vehicles use direct wireless communication to share real-time vehicle information, then the communication charges are reduced, but the communication reliability deteriorates due to hidden terminal problems and shadowing
Solution Approach 1:
The patent uses the wide area communication network as an intermediary to supplement direct communication. When direct communication fails or is unreliable (due to hidden terminal problems or shadowing), the wide area network provides an alternative transmission path. The dual-mode communication system (direct + wide area) ensures that vehicle information can be reliably transmitted and received even when direct communication is obstructed, thereby improving overall communication reliability without completely relying on wide area communication.
Solution Approach 2:
The system dynamically switches between direct communication and wide area communication based on detected conditions. When peripheral vehicles are detected via direct communication, the system relies primarily on direct communication for real-time information sharing. When no peripheral vehicles are detected or direct communication is unreliable, the system activates wide area communication to ensure information delivery, thus adaptively maintaining communication reliability.
3Speed
If the transmission cycle of vehicle information packets is shortened to ensure real-time information, then the real-time information sharing is improved, but the communication traffic increases
Solution Approach 1:
The patent implements a dynamic transmission cycle that adapts to communication conditions. Instead of using a fixed short transmission cycle that would always generate high traffic, the system uses a long transmission cycle when peripheral vehicles are not detected (reducing traffic) and switches to a short transmission cycle only when peripheral vehicles are present and real-time information is needed. This dynamic adjustment resolves the contradiction between information freshness and traffic reduction.
Solution Approach 2:
The system employs periodic transmission with two different periods (transmission cycles). The first periodic action uses a long transmission cycle for normal conditions to minimize traffic, while the second periodic action uses a short transmission cycle when real-time information is required. This periodic switching between different transmission intervals optimizes the balance between information freshness and communication traffic.
Data Source
AI summary
A vehicular communication control device includes: a dedicated short range communication processor executing a direct vehicle-to-vehicle communication; a wide area communication processor executing an indirect vehicle-to-vehicle communication; a vehicle data generator, and a peripheral vehicle determination unit determining whether another vehicle is disposed within a predetermined area. The dedicated short range communication processor wirelessly transmits a communication packet including vehicle data in a dedicated short range transmission cycle. The wide area communication processor transmits the communication packet including the vehicle data to a peripheral vehicle in a wide range transmission cycle. The wide area communication processor: selects a first wide area transmission cycle longer than the dedicated short range transmission cycle when no other vehicle is disposed within the area; and selects a second wide area transmission cycle equal to or shorter than the dedicated short range transmission cycle when the other vehicle is disposed within the area.