A speed-adaptive access method for a mec-assisted fleet network

Abstract

The invention discloses a speed adaptive access method of an MEC-assisted fleet network. First, a fairness index is defined to measure the fairness of vehicle communication at different speeds, and the relationship between the fairness index and the vehicle speed and the vehicle's current data packet transmission is obtained. The relationship between the minimum contention window in the case of ; secondly, the closed-form solution of the information age of a communication link within the coverage of the base station and the average information age of the network under saturation conditions are derived by using a stochastic hybrid system; then, each communication link is defined The average backoff rate and average service rate of the road, and the theory of collision-free transmission is proposed; the average number of vehicles within the coverage of the base station is determined; finally, the optimal minimum competition window size of vehicles with different speeds is obtained by constructing a multi-objective equation. The invention is easy to calculate, and while ensuring that the amount of data sent by vehicles at different speeds is as equal as possible, the average information age of the network is almost the same as the average information age of the network under the condition of using the standard IEEE 802.11 protocol.

Description

technical field [0001] The invention belongs to the technical field of on-vehicle task offloading, and in particular relates to a speed adaptive access method of an MEC-assisted fleet network. Background technique [0002] Autonomous driving technology has become one of the hot research topics in recent years. Compared with traditional cars, autonomous vehicles can improve road safety, reduce traffic accidents, and improve the user's driving experience. Formation strategy is an important management strategy for autonomous driving. Autonomous vehicles use formation strategy to form a fleet on the same lane. Each fleet is composed of a leading vehicle and member vehicles. The leading vehicle controls the dynamic factors of the entire fleet (driving direction, speed, acceleration, etc.) ), the following member vehicles follow the leading vehicle one by one at the same speed and inter-vehicle distance. [0003] In order to perceive the surrounding environment, the self-driving ...

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Problems solved by technology

[0006] Purpose of the invention: The present invention aims at issues such as the fairness of the amount of data sent to the base station by vehicles with different speeds within the coverage area of ​​the base station in the expressway fleet scene and the incomplete consideration of the average information age of the network, and proposes a MEC-assisted fleet network speed The adaptive access method ensures that the amount of data sent by vehicles at different speeds is as equal as possible, and at the same time makes the average information age of the network almost the same as that of the network using the standard IEEE 802.11 protocol

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