Inter-Vehicle Communication Device Adaptive Power Control
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Solution Overview
Problem
Existing inter-vehicle communication systems face challenges in maintaining reliable communication with vehicles in regions with sparse radio wave propagation characteristics while avoiding communication congestion, as existing methods fail to balance transmission power effectively across varying vehicle densities and propagation conditions.
Innovation Solution
An inter-vehicle communication device equipped with a position detector, transmitting device, receiving device, and processing circuit that uses a transmission output correction table to adjust transmission power based on relative position coordinates, ensuring reliable communication in sparse regions and preventing congestion by setting optimal power levels according to radio wave propagation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to establish communication with vehicles in sparse propagation regions, then communication reliability is improved, but communication congestion occurs in dense regions
Solution Approach 1:
The patent applies local quality by setting different transmission power levels for different spatial regions. The transmission power control unit determines appropriate transmission power based on the peripheral vehicle's position relative to the own vehicle, using higher power for vehicles in sparse propagation regions (e.g., behind the own vehicle) and lower power for vehicles in dense propagation regions (e.g., in front of the own vehicle). This spatially differentiated power control ensures reliable communication where needed while avoiding congestion where not needed.
Solution Approach 2:
The patent implements dynamics by making transmission power adjustable and adaptive rather than fixed. The transmission power control unit dynamically adjusts transmission power based on real-time position information of peripheral vehicles and propagation characteristics. This allows the system to respond to changing communication conditions, optimizing power levels for each transmission event to balance reliability and congestion avoidance.
2Object-generated harmful factors
If transmission power is restricted to avoid congestion, then communication congestion is reduced, but communication with vehicles in sparse regions cannot be established
Solution Approach 1:
The patent applies local quality by setting different transmission power levels for different spatial regions. The transmission power control unit determines appropriate transmission power based on the peripheral vehicle's position relative to the own vehicle, using higher power for vehicles in sparse propagation regions (e.g., behind the own vehicle) and lower power for vehicles in dense propagation regions (e.g., in front of the own vehicle). This spatially differentiated power control ensures reliable communication where needed while avoiding congestion where not needed.
Solution Approach 2:
The patent implements dynamics by making transmission power adjustable and adaptive rather than fixed. The transmission power control unit dynamically adjusts transmission power based on real-time position information of peripheral vehicles and propagation characteristics. This allows the system to respond to changing communication conditions, optimizing power levels for each transmission event to balance reliability and congestion avoidance.
3Reliability
If transmission power is set high for all vehicles, then communication with all peripheral vehicles is established, but unnecessary power consumption occurs in dense regions
Solution Approach 1:
The patent applies local quality by setting different transmission power levels for different spatial regions. The transmission power control unit determines appropriate transmission power based on the peripheral vehicle's position relative to the own vehicle, using higher power for vehicles in sparse propagation regions (e.g., behind the own vehicle) and lower power for vehicles in dense propagation regions (e.g., in front of the own vehicle). This spatially differentiated power control ensures reliable communication where needed while avoiding congestion where not needed.
Solution Approach 2:
The patent applies partial action by providing transmission power only where necessary rather than uniformly to all vehicles. The system identifies specific regions with sparse propagation characteristics and applies higher power only in those areas, while using reduced power in regions with good propagation characteristics. This selective power application eliminates unnecessary power consumption in dense regions while maintaining communication reliability in sparse regions.
Data Source
AI summary
The processing circuit of an inter-vehicle communication device includes a transmission output correction table in which a transmission power value or a corrected transmission power value in accordance with propagation characteristics of radio waves transmitted from an own vehicle is set to correspond to a region with coordinates having a direction of travel of the own vehicle as an axis. The processing circuit acquires a transmission power value or a corrected transmission power value corresponding to relative position coordinates of a peripheral vehicle from the transmission output correction table, and determines transmission power for when transmitting own vehicle travelling information to the peripheral vehicle. Because of this, communication with the peripheral vehicle positioned in a region in which radio wave propagation characteristics are sparse can be reliably established, and communication congestion can be avoided.