Vehicle Communication Device Synchronization for Interference Avoidance
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Solution Overview
Problem
In traffic control systems, vehicles and roadside units share the same communication channel, leading to interference when transmitting information simultaneously, resulting in unreliable and delayed reception of roadside unit information by vehicles.
Innovation Solution
A communication device in vehicles synchronizes reception timing with roadside units, registers communication areas based on reception position information, and stops transmission when within these areas to avoid interference, ensuring reliable reception of roadside unit information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vehicles and roadside units transmit information on the same channel simultaneously, then communication efficiency is improved, but interference occurs and reception reliability deteriorates
Solution Approach 1:
The patent implements periodic time-division multiplexing where roadside units transmit information at predetermined intervals, and vehicles switch between transmission and reception modes periodically. This ensures that when roadside units are transmitting, vehicles are in reception mode, and when vehicles are transmitting, roadside units are in reception mode, eliminating simultaneous transmission interference while maintaining efficient communication throughput.
Solution Approach 2:
The patent dynamically switches the communication device between transmission mode and reception mode based on the operational state and position relative to roadside units. This dynamic mode switching allows the system to adapt to changing conditions, ensuring that transmission only occurs when reception is not required, thereby preventing interference while maintaining communication efficiency.
2Speed
If vehicles transmit information continuously, then information delivery speed is improved, but interference with roadside unit reception increases
Solution Approach 1:
The patent implements periodic transmission intervals for vehicles, where information is transmitted at predetermined time slots rather than continuously. This periodic transmission reduces the overall transmission duty cycle, minimizing interference with roadside unit operations while ensuring that critical information is delivered at regular intervals, maintaining adequate information delivery speed.
Solution Approach 2:
The patent ensures continuous communication coverage by implementing a coordinated system where vehicles switch to reception mode when roadside units are transmitting, and roadside units switch to reception mode when vehicles are transmitting. This continuous coordination ensures that useful communication action is maintained without interruption, while preventing harmful simultaneous transmissions.
Data Source
AI summary
According to an embodiment, a communication device is provided in a movable body and is wirelessly communicable with a transceiver unit and another movable body. The communication device includes a transmitter, a receiver, a synchronization unit, a registration unit, and a stop control unit. The transmitter transmits movable body information on the movable body to a predetermined channel. The receiver receives transceiver unit information that the transceiver unit has transmitted to the predetermined channel. The synchronization unit performs synchronization of reception timing when the transceiver unit information can be received. The registration unit registers a communication area of the transceiver unit calculated based on a position where the other movable body receives the transceiver unit information in storage. The stop control unit stops transmission of the movable body information at a reception timing of the transceiver unit information, when a position of the movable body is within the registered communication area.