文档介绍：资料
学校代码: 10184
学号: 2084020253
延边大学
本科毕业论文
题目:车载环境下无线接入系统中EDCA方式的应用
学生姓名:林静
学院:工学院
专业:电子信息工程
年级:2008级
指导教师:朱东弼副教授
二〇一二年六月
摘要
近年来,随着汽车工业的普及,私家车数量的激增,道路拥塞的日益严重,交通事故的频发,以及各式各样车载设备的不断涌现,车载通信领域的研究引起了人们极大的关注。如何创建高性能、安全的车载通信网络给无线研究者们提出了新的挑战。然而,已提出的车载环境下无线接入(WAVE)技术仍存在一些不足。
本文首先介绍了WAVE的概念及现有的多信道MAC机制,其次阐述了EDCA(Enhanced Distributed Channel Access)方式,即增强型分布式信道访问。随后提出引入EDCA方式能够在一定程度上提高系统性能及服务质量(QoS),H间隔中即时传送安全信息(Safety Information),从而更大程度上满足人们对车载通信日益增加的需求。
在车载无线接入系统中,H间隔中即时传送安全信息。因此,本文分析了EDCA的原理及优点,以现有的多信道MAC机制为基础,针对其不足之处,提出了在MAC层中引入EDCA方式代替原有的DCF(Distributed Coordination Function)方式,满足了以上要求。
关键词:车载环境下无线接入;增强型分布式信道访问;媒体接入控制;服务质量
Abstract
With the prevalence of Vehicle Industry, the booming number of private cars, the severe circumstance of congested traffic, the frequent occurrence of traffic accidents, and the continuous improvement of vehicular equipments, the area of munication arouse our strong attention in the recent couple of years. How to build the work with high performance and safety gives the researchers, whom focus on wireless area, a brand new challenge. Nevertheless, the given WAVE (Wireless Access in Vehicular Environments) technique still has some imperfections.
In this paper, we introduced the conception of WAVE and Multi-channel MAC Mechanism. Then, we describe the EDCA mode, that is, Enhanced Distributed Channel Access. Later, we bring EDCA to the system which can improve the performance and QoS of WAVE system, also realize the immediate Safety-Information transmission in the H Interval. Thus, it can satisfy the increasing demands of munication.
In the WAVE system, we need high QoS and also the realization of the immediate Safety-Information transmission in the H Interval. Thus, we analyzed the principle and advantages of EDCA, and then we satisfied the above requirements by introducing the EDCA mode to replace the current DCF (Distributed Coordination Function) mode of WAVE.
Keywords: Wireless Access in Vehicular Environments; En