On-Board Unit Frequency Segmentation for Vehicle Communication Switching
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Solution Overview
Problem
Existing vehicle communication systems face radio-wave interference issues when switching between multiple services, such as vehicle-vehicle and roadside-vehicle communications, due to the use of common frequencies in control channels, leading to failures in data communication and service switching.
Innovation Solution
The system employs distinct frequencies for control and service channels in each service type, with a reception-only service channel at a common frequency for vehicle-vehicle communication and separate frequencies for roadside-vehicle communication, allowing the on-board unit to switch services while minimizing radio-wave interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common frequency is used for control channels in multiple services, then service switching is enabled, but radio-wave interference occurs due to multipath phasing and overlapping communicable regions
Solution Approach 1:
The patent segments the frequency resources by allocating different frequencies to control channels of different services. Specifically, roadside-vehicle communication control channels use one frequency while vehicle-vehicle communication control channels use another frequency. This segmentation prevents radio-wave interference between services while maintaining service switching capability through properly designed communication frames.
Solution Approach 2:
The patent introduces frequency as an additional dimension for service differentiation beyond just time-division multiplexing. By adding frequency diversity, the system can simultaneously support multiple services without interference, effectively moving from a one-dimensional (time) to a two-dimensional (time-frequency) resource allocation approach.
2Loss of information
If broadcasting is performed in control channels for multiple services, then service information is transmitted, but data communication fails due to radio-wave interference
Solution Approach 1:
The patent segments frequency resources so that control channels for different services operate on different frequencies. This prevents radio-wave interference from affecting control channel broadcasting, ensuring reliable transmission of service information and destination address data without data communication failures.
3Productivity
If multiple communication terminals perform broadcasting in control channel simultaneously, then service information is disseminated, but radio-wave interference causes communication failure
Solution Approach 1:
The patent segments frequency resources by assigning different frequencies to control channels of different services. This allows multiple communication terminals to broadcast service information simultaneously without causing radio-wave interference, maintaining both high productivity in information dissemination and reliability in communication.
Data Source
AI summary
A communication system includes an on-board unit adapted to a vehicle-vehicle communication and roadside equipment 10 performing a roadside-vehicle communication. In communications in service channels of the vehicle-vehicle communication, one reception-only service channel in which the on-board unit only performs a reception operation is provided for a plurality of the service channels and communications in the reception-only service channel is performed at the same frequency as that of the control channels of the roadside-vehicle communication. When the vehicle-vehicle communication is performed, the on-board unit performs switching to the roadside-vehicle communication in response to detection of reception in the reception-only service channel of a radio signal transmitted from the roadside equipment 10 in a control channel of the roadside-vehicle communication.