Vehicular Communication Control Device for Dynamic Transmission Cycle Adjustment
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Solution Overview
Problem
In vehicle-to-vehicle communication systems, there is a contradiction between reducing communication traffic and sharing real-time vehicle information over wide area networks, as the demand for lower transmission frequency conflicts with the need for shorter transmission intervals for real-time data.
Innovation Solution
A communication control device that adjusts the transmission cycle of vehicle information packets based on the proximity to road connection points, using a longer cycle when far from connection points to reduce traffic and a shorter cycle when approaching, allowing for real-time information sharing near intersections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the transmission frequency of vehicle information packets is reduced to lower communication traffic, then communication traffic is reduced, but real-time sharing of vehicle information deteriorates
Solution Approach 1:
The transmission cycle is made dynamic rather than fixed. The communication control device adjusts the transmission cycle based on the vehicle's position relative to road connection points. When approaching a road connection point (within predetermined distance), the transmission cycle is shortened to enable real-time information sharing. When far from road connection points, the transmission cycle is extended to reduce communication traffic. This dynamic adjustment resolves the contradiction between reducing communication traffic and maintaining real-time information sharing.
Solution Approach 2:
Different transmission cycles are applied in different spatial locations. The system identifies specific zones (near road connection points) where real-time information sharing is critical and applies a short transmission cycle in those zones. In other zones (far from road connection points), a long transmission cycle is applied to minimize communication traffic. This location-based differentiation allows the system to optimize both communication efficiency and information freshness in their respective contexts.
2Loss of energy
If a fixed long transmission cycle is used to reduce communication traffic, then communication traffic is reduced, but the ability to share real-time information near road connection points deteriorates
Solution Approach 1:
The system transitions from a static fixed transmission cycle to a dynamic adaptive transmission cycle. The communication control device continuously monitors the vehicle's position relative to road connection points and adjusts the transmission cycle accordingly. This dynamic behavior enables the system to adapt to different driving scenarios - using long cycles for fuel efficiency during steady-state driving away from intersections, and switching to short cycles for real-time information sharing when approaching road connection points where safety-critical information is needed.
Solution Approach 2:
The transmission cycle parameter is changed based on contextual conditions. The system uses road information (distance to road connection points) as a condition to select between two transmission cycle values (first cycle for long distance, second cycle for short distance). This parameter change strategy allows the system to optimize communication traffic while maintaining adaptability to different driving scenarios, particularly near road connection points where real-time information is crucial.
3Loss of information
If a fixed short transmission cycle is used to ensure real-time information sharing, then real-time information sharing is improved, but communication traffic increases
Solution Approach 1:
The system applies different transmission cycles to different spatial locations rather than using a uniform cycle everywhere. Short transmission cycles are localized to areas near road connection points where real-time information sharing provides the most value for safety and driving assistance. Long transmission cycles are applied in other areas where real-time information is less critical. This localized approach ensures real-time information sharing is maintained where needed while minimizing unnecessary communication traffic in areas where it provides less benefit.
Solution Approach 2:
Instead of maintaining a short transmission cycle continuously (excessive action), the system applies short cycles only partially - specifically when the vehicle is within the predetermined distance of a road connection point. This partial application of the short cycle strategy provides real-time information sharing capability exactly when and where it is most needed, while avoiding the excessive communication traffic that would result from using short cycles during all driving conditions.
Data Source
AI summary
A vehicular communication control device includes: a communication packet generator generating a vehicle information packet indicating a vehicle traveling state; a transmission processor transmitting the vehicle information packet to a peripheral vehicle in a predetermined transmission cycle; a road information acquisition unit acquiring forward road information including a road connection point position at which a host vehicle traveling road is connected to another road; and a positional relationship determination unit determining, based on the forward road information, whether a remaining distance to the road connection point is equal to or smaller than a predetermined cycle change distance. The transmission processor: sets a predetermined first cycle as the transmission cycle when the remaining distance is larger than the predetermined cycle change distance; and sets a second cycle shorter than the first cycle as the transmission cycle when the remaining distance is equal to or smaller than the cycle change distance.