Vehicle Communication Frequency Adaptation for High Speed Stability
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Solution Overview
Problem
Existing road-to-vehicle and vehicle-to-vehicle communication systems struggle to maintain stable communication when vehicle speeds are high, as vehicles quickly move through multiple cells, leading to frequent handovers and instability in communication.
Innovation Solution
A communication system that detects vehicle speed and adjusts the communication frequency accordingly, using a first frequency for lower speeds and a second, lower frequency for higher speeds, allowing for stable communication even at high speeds by maintaining connectivity within a wider cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a vehicle travels at high speed through multiple cells, then communication coverage area is improved, but communication stability deteriorates due to frequent handovers
Solution Approach 1:
The patent changes the frequency parameter of the radio signal based on vehicle speed. When vehicle speed exceeds a threshold, the system switches to a lower frequency band, which has better propagation characteristics and can maintain stable communication over longer distances and through multiple cells, thus resolving the contradiction between coverage area and communication stability.
2Productivity
If a higher frequency is used for communication, then communication capacity is improved, but Doppler shift influence increases at high vehicle speeds
Solution Approach 1:
The patent dynamically adjusts the frequency parameter based on vehicle speed conditions. At high speeds, it switches to lower frequency bands that are less susceptible to Doppler shift effects, while at lower speeds it can utilize higher frequency bands for greater communication capacity, thus resolving the contradiction between capacity and Doppler shift resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures stable communication for vehicles traveling at high speeds by reducing the frequency of handovers and maintaining connectivity within a wider cell, thereby improving communication reliability.
Implementation Method 1
PTL 1 as a reference technique discloses that a radio transmission device mounted on a moving body such as a traveling vehicle reduces influence of a Doppler shift by giving a radio signal being transmitted a frequency shift being set based on a speed of the moving body
Data Source
AI summary
The communication system includes a communication circuit configured to communicate with the vehicle, and a detection circuit configured to detect speed information corresponding to the speed of the vehicle, and on the basis of the speed information, the communication circuit communicates with the vehicle by using a first frequency when the speed is a first speed, and communicates with the vehicle by using a second frequency lower than the first frequency when the speed is a second speed higher than the first speed.