VRU ITS Station Dynamic Message Suppression
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Solution Overview
Problem
Existing Intelligent Transportation Systems (ITS) carried by Vulnerable Road Users (VRUs) face challenges with radio channel congestion and limited battery life due to frequent message transmission, which increases energy consumption and weight.
Innovation Solution
An ITS-S for VRUs that includes a motion sensor to determine VRU motion data, a transmitter to send messages, a receiver to receive vehicle motion data, and a controller to compare and suppress message transmission when the VRU is detected to be aboard a vehicle with its own ITS-S, thereby reducing unnecessary message transmission and conserving energy and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ITS-S transmits VRU messages frequently to ensure safety, then the safety monitoring is improved, but the energy consumption and battery life are worsened
Solution Approach 1:
The transmission frequency of VRU messages is made dynamic rather than fixed. The controller adjusts the transmission frequency based on the VRU's actual state (whether aboard a vehicle or not). When the VRU is detected to be aboard a vehicle, transmission is suppressed or frequency is reduced. When the VRU is not aboard a vehicle, normal transmission frequency is maintained. This dynamic adjustment resolves the contradiction by adapting the system behavior to current conditions.
Solution Approach 2:
The system changes the transmission parameter (frequency/duty cycle) based on detected conditions. By comparing VRU motion data with vehicle motion data and detecting when the VRU is aboard a vehicle, the system modifies the transmission parameter from high frequency to suppressed transmission. This parameter change directly addresses the contradiction between safety monitoring and energy consumption.
2Reliability
If the ITS-S transmits VRU messages frequently to ensure safety, then the safety monitoring is improved, but the battery life is worsened
Solution Approach 1:
The transmission duty cycle is dynamically adjusted based on the VRU's state. When the VRU is aboard a vehicle, the transmission is suppressed or frequency reduced, extending battery life. When the VRU is not aboard a vehicle, normal transmission continues to ensure safety. This dynamic behavior resolves the contradiction between safety monitoring and battery life duration.
Solution Approach 2:
The system modifies the transmission parameter (frequency/duty cycle) based on detected conditions. By comparing motion data and detecting vehicle boarding, the system changes from high-frequency transmission to suppressed transmission, directly extending battery life while maintaining safety when needed.
3Weight of moving object
If the ITS-S is designed to be lightweight for VRU comfort, then the weight is reduced, but the transmission power and range are worsened
Solution Approach 1:
The system applies partial transmission action rather than continuous full-power transmission. By suppressing transmission when the VRU is aboard a vehicle or when safety is not at risk, the system uses only the necessary amount of transmission power required for safety, rather than excessive continuous transmission. This resolves the contradiction by matching transmission power to actual safety needs.
Data Source
AI summary
The disclosed subject matter relates to an Intelligent Transportation System station (ITS-S) for being carried by a Vulnerable Road User (VRU), comprising: a motion sensor for determining VRU motion data indicative of a VRU position, a VRU speed, and a VRU heading; a transmitter for transmitting a VRU message including the determined VRU motion data; a receiver for receiving, concerning a vehicle, vehicle motion data indicative of a vehicle position, a vehicle speed, and a vehicle heading; and a controller for controlling the transmitter; wherein the controller is configured to compare the determined VRU motion data with the received vehicle motion data and, when the result of the comparison meets a predetermined criterion, to suppress the transmitting of said VRU message.