A fast switch method between obu and rsu based on vanet

Abstract

The invention belongs to a mobile communication technology field, and discloses an OBU (on board unit) and an RSU (road-side unit) fast switching method based on a VANET(vehicular ad hoc network). The RSU is used to receive a vehicle speed transmitted by the OBU to determine whether a road is currently jammed. When the road is not jammed, the RSU is used for operation of received vehicle position data transmitted by the OBU by an FCM algorithm, and an optimal switching position is determined, and whether the switching is carried out is determined by combing with the received vehicle speed and received signal intensity. When a switching condition is satisfied, the RSU is used to calculate a cosine value of a received speed driving direction vector and stored position vectors of other RSU, and is used to determine the RSU direction in which the OBU drives, and then the switching is completed. By fully considering the road traffic condition and fully using the advantage of the determined direction of the vehicle driving along a fixed road, switching time delay and channel congestion are greatly reduced, and user experience is improved.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and relates to a fast switching method using an FCM (Fuzzy c-means, fuzzy C-means clustering algorithm) algorithm to process the position of a traveling vehicle; ), the vehicle moves quickly, and the OBU (On Board Unit, vehicle-mounted unit) needs to quickly complete the switch with the RSU (Road-Side Unit, road test unit). A fast switching method of signal strength; Background technique [0002] In the VANET based on the WAVE (Wireless Access Vehicular Environment) protocol stack, a complete switch between OBU and RSU mainly includes three parts: channel scanning, authentication and re-association; among them, channel scanning takes the most time. Long, accounting for more than 90% of the entire switching delay; therefore, in order to achieve the purpose of reducing switching delay and fast switching between OBU and RSU, it is mainly to reduce the time occupied by channel scanning;...

AI Technical Summary

Problems solved by technology

[0004] 1. In the vehicular ad hoc network, high-speed vehicles cause frequent link disconnection and reconnection, the number of switching required is significantly more than that of the traditional ad hoc network, and the required switching delay is significantly higher than that of the traditional ad hoc network less; traditional handover methods cannot meet the requirements of vehicular ad hoc networks;

[0005] 2. The handover method of the traditional ad hoc network is not fully utilized. In the vehicular ad hoc network, the driving path of the vehicle is fixed and the driving direction can be determined; then the RSU that needs to be connected for the next handover can be predicted in advance, which can greatly improve Reduce the channel scanning delay during switching, thereby reducing the overall switching delay;

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