DSRC Congestion Control Certification Tool
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Solution Overview
Problem
Current V2X congestion control algorithms require costly and complex testing environments with hundreds of devices to simulate congestion conditions, making certification impractical and expensive.
Innovation Solution
A dedicated short range communication (DSRC) congestion control certification tool that uses a vehicle identification unit, message generation unit, and communication unit to simulate target congestion levels, packet error rates, and channel busy percentages, allowing for certification with minimal devices and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex test beds with hundreds of devices are used to simulate congestion conditions, then the accuracy of congestion control algorithm testing is improved, but the device complexity and testing cost increase significantly
Solution Approach 1:
The patent uses a single certification tool that generates virtual messages and simulated congestion conditions instead of requiring hundreds of physical devices. The tool creates copies of BSM messages with controlled parameters (transmission rates, power levels, error rates) to simulate various congestion scenarios, thereby achieving accurate testing without complex multi-device test beds
Solution Approach 2:
The certification tool acts as an intermediary between the test vehicle and the simulated congestion environment. It generates test messages, controls channel conditions (busy percentage, packet error rate), and measures transmission performance, replacing the need for multiple remote vehicles and complex coordination infrastructure
2Reliability
If hundreds of devices are deployed to create congestion conditions, then the realism of congestion scenarios is improved, but the testing cost and time consumption increase
Solution Approach 1:
The patent achieves different congestion scenarios by changing message parameters (transmission rate, power level, error rate, message size) rather than deploying varying numbers of physical devices. The message generation unit can dynamically adjust these parameters to create light, moderate, and heavy congestion conditions, maintaining realism while reducing setup time and cost
Solution Approach 2:
The certification tool pre-configures message templates, vehicle identification data, and congestion scenario parameters before testing begins. This preliminary preparation allows the tool to quickly switch between different congestion levels without requiring physical device reconfiguration, significantly reducing certification time
3Measurement precision
If multiple remote vehicles transmit messages to create congestion, then the accuracy of transmission rate measurement is improved, but the complexity of message coordination increases
Solution Approach 1:
The patent extracts the message coordination function from multiple remote vehicles and consolidates it into the certification tool. The tool independently generates all test messages with precise timing and control, eliminating the need for complex inter-vehicle coordination protocols while maintaining accurate transmission rate measurements through its internal message generation and counting mechanisms
Data Source
AI summary
A certification tool configured to communicate with a dedicated short range communication system includes a vehicle identification unit, a message generation unit, and a communication unit. The vehicle identification unit generates unique vehicle identifications for a target number of remote vehicles. The message generation unit generates messages at a target number of transmitted messages per second for each remote vehicle, and the communication unit communicates the messages to the test vehicle to achieve a target congestion level.