WSN MAC protocol based on bidirectional curve traffic command system

Abstract

The invention discloses a WSN MAC protocol based on bidirectional curve traffic command system. The protocol includes that: a superframe structure is divided into non-active period and an active period, and the active period includes a contend access period, a beacon period and a non-contend access period; in the non-active period, a sensor node sleeps, a gathering node executes data fusion, and atraffic control command is generated; in the contend access period, the sensor node detecting an event reports brief information of event to the gathering node according to access authority and contend timeslot regulated by the gathering node; in the beacon period, the gathering configures contend access period access authority according to the reported event information and allocates the timeslot in the non-contend access period to a specific sensor node; and in the non-contend access period, and the sensor node sends detail data of the event to the gathering node in time division multiplexing manner in regulated timeslot according to timeslot allocation of the gathering node.

Description

Technical field [0001] The present invention relates to the communication technology of wireless sensor network, in particular to a two-way curve traffic command system, an improvement and implementation method of the wireless sensor network MAC protocol, so as to improve the real-time performance of data transmission and reduce energy consumption. Background technique [0002] Intelligent traffic command system is a large-scale system that combines advanced information technology, data communication transmission technology, electronic control technology and computer processing technology to effectively and comprehensively apply to transportation services, control and management. Its purpose is to make the unified dispatch of pedestrians and vehicles, greatly improve the overall transportation efficiency, and ensure traffic safety. [0003] The traffic situation at the two-way curve is more complicated, and the control is more difficult. And two-way bends are a common traffic situ...

AI Technical Summary

Problems solved by technology

Due to the limitation of visual range, slope and corner curvature, the two-way curve has become a difficult point in traffic control, which is easy to cause traffic jams and accidents such as vehicle hang-ups

Compared with ordinary turning intersections, the traffic conditions at two-way curves have the following characteristics: First, when driving uphill, the leading vehicle may slide down due to shifting gears, so the driver of the following vehicle will keep a safe distance from the leading vehicle. It will be larger than the safe distance of driving in a straight line under the same speed conditions; and the following vehicle responds slowly to the acceleration of the leading vehicle and sensitive to the deceleration of the leading vehicle; secondly, when driving downhill, the leading vehicle generally has a slope If the speed on the slope is lower than the speed on the slope, it will accelerate and will not decelerate suddenly; therefore, the following car follows the speed change of the leading vehicle to change the speed, which is more sensitive than normal conditions, and the slope has a positive stimulating effect on the driver's following; Third, when there are few vehicles on the road, the vehicle is prone to travel too fast. At the corner, due to the limitation of the corner curvature, it is easy to cause dangers such as crossing the boundary and colliding with vehicles traveling in the opposite direction; fourth, when the road When there are many vehicles on board, due to the limited vision of the driver at the corner, if the leading vehicle suddenly decelerates at the turning, the driver of the following vehicle does not have enough time to react, and traffic accidents such as traffic jams and hang-ups are prone to occur; In places such as the entrance of large supermarkets, motor vehicles, non-motor vehicles and pedestrians are mixed. Due to the difference in driving speed and the influence of the two-way curve on the means of transportation, collision accidents are likely to occur due to insufficient avoidance.

Images