A priority-based vanets data distribution method

Abstract

The invention discloses a priority-based VANETs data distribution method, which belongs to the technical field of vehicular network. The invention uses a roadside base station RSU as an information source and a vehicle as a client for data request and reception. High and low priority classification is carried out, high priority and low priority are given different weight values; then the utility is evaluated according to the data requested by the vehicle, the driving position and speed information, and the utility evaluation considers the weight of the requested data, the amount of data requested, and the data. The expiration time of the request, the aggregation degree of the vehicle, the geometric distance between the vehicle and the information source are factors, and the utility value is obtained by combining the above factors, and finally the data is encoded and transmitted by using network coding technology according to the obtained utility value. The V2R data transmission method based on network coding not only ensures the transmission effect of security application data, but also takes into account the transmission efficiency of user application data, thereby improving the transmission performance of the entire system.

Description

technical field [0001] The invention relates to a priority-based VANETs data distribution method, which belongs to the technical field of wireless communication vehicular networks. Background technique [0002] With the development of wireless communication technology and the cross-penetration of multi-disciplines such as mechanical automation, Vehicular Adhoc Networks (VANETs) has been proposed as a special form of traditional Mobile Adhoc Networks (MANETs). For wireless data interaction in the vehicle field. In VANETs, ​​a small communication network is formed between vehicles, roadside communication base stations, and other facilities, and data can be transmitted and exchanged between vehicles, and can also be communicated between vehicles and roadside infrastructure (Road Side Unit, RSU) . Relying on the two mainstream communication modes of vehicle-to-vehicle (Vehicle to Vehicle, V2V) communication and vehicle / road (Vehicle to RSU, V2R) communication, the vehicle ad h...

AI Technical Summary

Problems solved by technology

If the early warning message of an accident in front cannot be transmitted to the driver of the rear vehicle in time, the early warning that arrives after the collision between the rear vehicle and the accident vehicle is meaningless, and for user applications, although the requirements for data transmission delay are not safe The application is so strict, but the long waiting delay when users access the Internet and the long download delay of P2P applications will seriously affect the user experience, and even make users lose interest and give up the application.

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