車路通信中MAC層消息傳輸機制研究
發(fā)布時間：2018-08-22 16:14
【摘要】：當前交通系統(tǒng)運行效率較低與人們出行要求越來越高的的矛盾已逐漸暴露出來,成為當前交通行業(yè)亟需解決的一個根本問題。因此,研究以車路通信為重要組成部分的智能交通系統(tǒng)也顯得愈加急迫和重要。相比傳統(tǒng)的無線自組織網(wǎng)絡(luò),其車輛節(jié)點的移動速度更快,對實時性、可靠性要求較高,從而導(dǎo)致網(wǎng)絡(luò)拓撲變化更為頻繁、鏈路中斷現(xiàn)象增加,節(jié)點通信困難,這就使得車路通信研究面臨巨大的挑戰(zhàn)。本文對車路通信中的消息傳輸機制做了如下工作:1、對車路通信技術(shù)的研究背景和意義、國內(nèi)外研究、車路通信網(wǎng)絡(luò)的特點、DSRC技術(shù)的優(yōu)勢、WAVE/1609協(xié)議標準、DCF機制、CSMA/CA機制以及一些待解決的問題等方面進行了分析和歸納。2、提出了一種MAC層的動態(tài)優(yōu)先級調(diào)度機制。先就車路通信網(wǎng)絡(luò)中的車輛運動模型、安全消息的相關(guān)研究等方面進行了歸納總結(jié),然后分析并指出了現(xiàn)有的車路通信中存在的一些問題,如車路通信中節(jié)點的通信模式會導(dǎo)致網(wǎng)絡(luò)中存在大量的冗余安全控制消息,導(dǎo)致有意義的安全消息無法得到可靠和及時的傳輸。在分析消息傳輸?shù)奶攸c之后,建立包含時間、距離、方向的函數(shù)動態(tài)判定消息的優(yōu)先級,根據(jù)方向過濾無意義的消息,并引入絕對優(yōu)先級保證特殊車輛的順暢通信。3、針對信道競爭問題,提出了一種自適應(yīng)的退避算法。在分析信道競爭中存在不公平現(xiàn)象進行分析的基礎(chǔ)上,結(jié)合了車路網(wǎng)絡(luò)中節(jié)點移動特征。該算法綜合考慮了節(jié)點的移動速度、方向、位置等參數(shù),調(diào)整競爭窗口的值,分配相應(yīng)信道訪問的優(yōu)先權(quán)。4、通過NS2的仿真平臺和VanetMobiSim生成的節(jié)點運動模型,對提出的兩種機制進行了吞吐量、時延、鏈路穩(wěn)定性以及公平性等方面的評估,驗證了所提出的兩種機制的有效性。
[Abstract]:At present, the contradiction between the low efficiency of the transportation system and the higher and higher travel requirements has been gradually exposed, which has become a fundamental problem that needs to be solved in the current transportation industry. Therefore, it is more and more urgent and important to study the intelligent transportation system which is an important part of vehicle-road communication. Compared with the traditional wireless ad hoc networks, the vehicle nodes move faster, require higher real-time and reliability requirements, resulting in more frequent network topology changes, increased link disruption phenomenon, node communication difficulties. This makes the study of vehicular communication facing a huge challenge. This paper has done the following work on the message transmission mechanism of vehicle-road communication: 1, the research background and significance of vehicle-road communication technology, domestic and foreign research, The characteristics of vehicle-road communication network and the advantages of DSRC technology are analyzed and summarized in the aspects of WAV / 1609 protocol standard / DCF mechanism, CSMA / CA mechanism and some problems to be solved, and a dynamic priority scheduling mechanism in MAC layer is proposed. In this paper, the vehicle motion model in vehicle-road communication network and the related research of security message are summarized, and then some problems existing in vehicle-road communication are analyzed and pointed out. For example, the communication mode of nodes in vehicle-road communication will lead to the existence of a large number of redundant security control messages in the network, resulting in meaningful security messages can not be reliable and timely transmission. After analyzing the characteristics of message transmission, a function including time, distance and direction is established to dynamically determine the priority of the message and filter the meaningless message according to the direction. An adaptive Backoff algorithm is proposed to solve the channel competition problem by introducing absolute priority to guarantee the smooth communication of special vehicles. Based on the analysis of the unfair phenomenon in channel competition, the characteristics of node movement in vehicular network are combined. The algorithm synthetically considers the moving speed, direction and position of the node, adjusts the value of the competing window, assigns the priority of the corresponding channel access .4. through the simulation platform of NS2 and the node motion model generated by VanetMobiSim. The proposed two mechanisms are evaluated in terms of throughput, delay, link stability and fairness, and the effectiveness of the proposed two mechanisms is verified.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U463.67;U495
[Abstract]:At present, the contradiction between the low efficiency of the transportation system and the higher and higher travel requirements has been gradually exposed, which has become a fundamental problem that needs to be solved in the current transportation industry. Therefore, it is more and more urgent and important to study the intelligent transportation system which is an important part of vehicle-road communication. Compared with the traditional wireless ad hoc networks, the vehicle nodes move faster, require higher real-time and reliability requirements, resulting in more frequent network topology changes, increased link disruption phenomenon, node communication difficulties. This makes the study of vehicular communication facing a huge challenge. This paper has done the following work on the message transmission mechanism of vehicle-road communication: 1, the research background and significance of vehicle-road communication technology, domestic and foreign research, The characteristics of vehicle-road communication network and the advantages of DSRC technology are analyzed and summarized in the aspects of WAV / 1609 protocol standard / DCF mechanism, CSMA / CA mechanism and some problems to be solved, and a dynamic priority scheduling mechanism in MAC layer is proposed. In this paper, the vehicle motion model in vehicle-road communication network and the related research of security message are summarized, and then some problems existing in vehicle-road communication are analyzed and pointed out. For example, the communication mode of nodes in vehicle-road communication will lead to the existence of a large number of redundant security control messages in the network, resulting in meaningful security messages can not be reliable and timely transmission. After analyzing the characteristics of message transmission, a function including time, distance and direction is established to dynamically determine the priority of the message and filter the meaningless message according to the direction. An adaptive Backoff algorithm is proposed to solve the channel competition problem by introducing absolute priority to guarantee the smooth communication of special vehicles. Based on the analysis of the unfair phenomenon in channel competition, the characteristics of node movement in vehicular network are combined. The algorithm synthetically considers the moving speed, direction and position of the node, adjusts the value of the competing window, assigns the priority of the corresponding channel access .4. through the simulation platform of NS2 and the node motion model generated by VanetMobiSim. The proposed two mechanisms are evaluated in terms of throughput, delay, link stability and fairness, and the effectiveness of the proposed two mechanisms is verified.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U463.67;U495
【參考文獻】
相關(guān)期刊論文 前7條
1 徐進;邵毅明;楊奎;羅驍;羅慶;;基于人-車-路協(xié)同仿真的山區(qū)道路大型車輛行駛適應(yīng)性分析[J];中國公路學(xué)報;2015年02期
2 趙娜;袁家斌;徐晗;;智能交通系統(tǒng)綜述[J];計算機科學(xué);2014年11期
3 張利鋒;金蓓弘;張扶桑;;VANET中數(shù)據(jù)傳遞的關(guān)鍵技術(shù)[J];計算機科學(xué);2013年08期
4 朱鈞宇;黃傳河;徐利亞;王小毛;陳希;;VANET中一種鏈路穩(wěn)定度的計算方法[J];計算機工程與科學(xué);2013年01期
5 楊奎武;郭淵博;馬駿;鄭康鋒;;基于網(wǎng)絡(luò)編碼的延遲容忍移動傳感器網(wǎng)絡(luò)低時延廣播傳輸機制[J];電子與信息學(xué)報;2012年05期
6 謝波;肖曉強;徐明;宋宏斌;;基于速度向量的VANET位置預(yù)測路由協(xié)議[J];計算機工程;2009年23期
7 金純;柳興;萬寶紅;周曉軍;;IEEE802.11P:車載環(huán)境下的無線局域網(wǎng)[J];通信技術(shù);2009年01期
相關(guān)博士學(xué)位論文 前3條
1 易振國;車路協(xié)同實驗測試系統(tǒng)及安全控制技術(shù)研究[D];吉林大學(xué);2011年
2 尹洪英;道路交通運輸網(wǎng)絡(luò)脆弱性評估模型研究[D];上海交通大學(xué);2011年
3 劉爽;基于系統(tǒng)動力學(xué)的大城市交通結(jié)構(gòu)演變機理及實證研究[D];北京交通大學(xué);2009年
相關(guān)碩士學(xué)位論文 前4條
1 陳t，
本文編號：2197635
本文鏈接：http://sikaile.net/kejilunwen/daoluqiaoliang/2197635.html
