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Centralized internet of vehicle MAC layer combination and collision predicting and preventing method

A network of vehicles, centralized technology, applied in the direction of machine-to-machine/machine-type communication services, nan, electrical components, etc., can solve the problems of low channel utilization, high delay, reduce network delay, etc., to improve channel The effect of using efficiency

Active Publication Date: 2017-11-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
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Problems solved by technology

[0005] Aiming at the low channel utilization rate and high time delay of the existing Internet of Vehicles MAC protocol, the present invention proposes a centralized vehicle network MAC layer merge collision prediction and avoidance method based on the relative speed of nodes, through the centralized topology structure with RSU , RSU predicts collisions and coordinates the use of time slots to ensure a low combined collision rate and reduce network delay

Method used

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  • Centralized internet of vehicle MAC layer combination and collision predicting and preventing method
  • Centralized internet of vehicle MAC layer combination and collision predicting and preventing method
  • Centralized internet of vehicle MAC layer combination and collision predicting and preventing method

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Embodiment

[0053] In this embodiment, the constraints of the road model are as follows: the vehicle travels on a two-lane two-way expressway. The RSU (Rodeside unit, road side unit) maintains a radius of 400m and can manage vehicle conditions within a road length of 800m before and after it. The transmission range of one hop node is 100m.

[0054] like figure 1 As shown, the vehicle entering the RSU area obeys the Poisson distribution, and the vehicle travels along the lane within a certain speed range. RSU area is divided as figure 1 As shown, the RSU area is divided into four parts according to the geographical location and the two-hop range of vehicle node message transmission, and each part corresponds to a specific relay node time slot. The RSU acquires the information of the vehicle nodes in the RSU area, including speed, position, transmit power, etc.

[0055] The time division method of this method is as follows: figure 2 As shown, each time slot cycle is divided into three...

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Abstract

The invention discloses a centralized internet of vehicle MAC layer combination and collision predicting and preventing method, belonging to the field of VANET. The method permits reuse of a node timeslot beyond two hops, thereby making the timeslot resource more efficient. First, a road side unit (RSU) can access an idle timeslot set in an RSU timeslot broadcast node in each timeslot period, and a new node selects a timeslot to access randomly according to the timeslot set; then the RSU acquires a position, a speed and timeslot use condition of a vehicle in a range through a relay node, so as to predict the possibility that combination and collision occur; and finally, the RSU adjusts timeslot allocation and broadcasts an adjustment result, so as to prevent combination and collision effectively. In the method, timeslot reuse and assistance of RSU help lower the possibility of combination and collision, so as to shorten message delay of the MAC layer and increase throughput. The method can be used as an MAC layer protocol for sending a broadcast message by a node in the VANET.

Description

technical field [0001] The invention relates to a multi-channel Media Access Control MAC (MediaAccess Control) protocol in the Internet of Vehicles in the technical field of wireless communication, in particular to a method for predicting and avoiding a centralized MAC layer merge collision in the Internet of Vehicles. Background technique [0002] Intelligent Transportation Systems (Intelligent Transportation Systems, ITS) is a new type of transportation system with real-time, high efficiency and accuracy. With the development of ITS and people's demand for safe driving, VANET is widely studied in coordinating the communication between vehicles and vehicles, and between vehicles and roadside facilities. [0003] The channel resources of the Internet of Vehicles are limited, and how to efficiently use existing channels is the top priority of research. The messages to be transmitted in the Internet of Vehicles are divided into security messages and media messages. The tradit...

Claims

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Application Information

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IPC IPC(8): H04L29/08H04W74/08H04W4/00
CPCH04L67/12H04W4/70H04W74/0833H04W74/085
Inventor 胡斌杰蔺丽钊魏纵横吴朝东
Owner SOUTH CHINA UNIV OF TECH
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