Road traffic information collection method based on vehicle-road coordination

Abstract

The invention discloses a vehicle-road cooperation-based method for traffic information collection and status evaluation. The method solves the problems that in an existing vehicle-road cooperation-based road traffic information collection mode, all vehicles send status messages to an RSU in a fixed period, so that when the vehicle density is increased and alternatively the requirement for the status of a road is low, frequent sending of status message data packets will prolong hold-up time of a wireless communication channel, waste of communication resources is caused, and the number of wireless network loads is increased. Along with changes of traffic status, the period of the vehicles for sending the status message data packets can be adjusted dynamically, self-adaptive data transmission is achieved, the hold-up time of the channel is shortened, the number of the wireless network loads is reduced, and real-time performance and accuracy of traffic status evaluation are improved.

Description

technical field [0001] The invention relates to the field of traffic information collection and status evaluation, in particular to a road traffic information collection method based on vehicle-road coordination. Background technique [0002] With the development of the economy and the continuous improvement of people's living standards, the number of cars in our country has increased rapidly, and the surge in road traffic has led to frequent traffic congestion in cities. The more effective methods to solve traffic congestion are mainly traffic control and traffic guidance. Obtaining accurate and real-time urban road traffic status is the basis for effective control and guidance of urban road network traffic. Obtaining accurate and real-time traffic status requires real-time collection of urban road traffic information. The traditional way of collecting traffic information is through traffic information detectors distributed on each road, such as coil detectors, infrared de...

AI Technical Summary

Problems solved by technology

This road traffic information collection method based on vehicle-road coordination has the following defects: On the one hand, since all vehicles send status messages to the RSU at a fixed period, when the vehicle density increases or the demand for road status is not high (such as when the road is relatively smooth) ), frequent sending of status message packets will increase the occupation time of the wireless communication channel, resulting in a waste of communication resources, increasing the load of the wireless network, and further affecting other vehicle-road coordination applications

On the other hand, if the time interval for vehicles to send status message data packets is extended to reduce the network load, when the road section is congested, the excessively long message sending cycle will reduce the number of real-time data packets received by the RSU, thus affecting the road traffic status Timeliness and accuracy of evaluation

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