Vehicle Communication Device Dynamic Transmission Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In traffic control systems, interference occurs when multiple vehicles transmit information simultaneously on the same channel, leading to a lower probability of vehicles receiving essential roadside unit information, particularly at intersections with many stopping vehicles, which hampers the reception of critical traffic-light information.
Innovation Solution
A communication device for vehicles that includes a reception unit, extraction unit, transmission unit, timing control unit, and change unit, which adjusts the transmission timing of vehicle information to a longer period when a stopping command is indicated and the vehicle's speed is low, reducing transmission frequency and minimizing interference by adding random waiting times to avoid simultaneous transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vehicles transmit information frequently on the same channel, then the information transmission rate is high, but communication interference increases and reception reliability decreases
Solution Approach 1:
The patent implements periodic transmission of vehicle information at predetermined intervals rather than continuous transmission. The transmission interval is dynamically adjusted based on vehicle speed and traffic light state, creating a periodic action pattern that reduces channel congestion while maintaining essential information flow.
Solution Approach 2:
The transmission interval is made dynamic rather than fixed. When vehicle speed decreases below a threshold or when approaching a traffic light showing red, the transmission interval automatically increases (transmission frequency decreases). This dynamic adjustment optimizes channel usage based on real-time conditions, reducing interference when vehicles are stationary or moving slowly.
2Loss of time
If transmission frequency is increased to improve information update rate, then information freshness is improved, but communication congestion increases and energy consumption increases
Solution Approach 1:
The patent changes the transmission parameter (transmission interval) based on vehicle operating conditions. When vehicle speed is low or the traffic light is red, the transmission interval is increased, reducing the number of transmissions and associated energy consumption. When vehicle speed is high or the traffic light is green, the transmission interval is decreased to maintain information freshness.
3Productivity
If multiple vehicles transmit simultaneously to maintain high communication activity, then information exchange is active, but interference occurs and critical roadside unit information cannot be received
Solution Approach 1:
The patent applies preliminary anti-action by having vehicles adjust their transmission behavior in advance based on predicted interference conditions. When a vehicle detects it is approaching a traffic light or its speed decreases, it proactively increases the transmission interval before interference is likely to occur, preventing channel congestion and ensuring critical roadside unit information can be received.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
According to an arrangement, a communication device (22) is provided in a movable body and is wirelessly communicable with a transceiver unit and another movable body. A reception unit (51) of the communication device (22) receives transceiver unit information including traffic-light information that the transceiver unit has transmitted to a predetermined channel. An extraction unit (57) extracts the traffic-light information corresponding to a running direction of the movable body from the transceiver unit information. A transmission unit (62) transmits movable body information of the movable body to the predetermined channel. A timing control unit (44) controls a transmission timing of the movable body information such that a transmission control period becomes a preset first time. A change unit (60) changes the transmission control period to a second time longer than the first time, when the traffic-light information with respect to the running direction indicates a stopping command, and a speed of the movable body is a preset speed or less.