本文關(guān)鍵詞：智能交通系統(tǒng)無(wú)線(xiàn)接入?yún)f(xié)議性能研究　出處：《北京交通大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 智能交通系統(tǒng) 車(chē)路協(xié)同 車(chē)載自組織網(wǎng)絡(luò) 無(wú)線(xiàn)接入?yún)f(xié)議 IEEE802.11p/1609.4 協(xié)議改進(jìn)

【摘要】：近年來(lái),隨著智能交通系統(tǒng)研究的日益深入,車(chē)路協(xié)同系統(tǒng)的開(kāi)發(fā)備受關(guān)注。作為智能交通系統(tǒng)的重要組成部分,車(chē)路協(xié)同系統(tǒng)可以使車(chē)輛之間、車(chē)輛和路旁基礎(chǔ)設(shè)施之間的信息交互更加及時(shí)有效,達(dá)到優(yōu)化利用系統(tǒng)資源、提高道路交通安全、緩解交通擁堵的目標(biāo)。其中的車(chē)載自組織網(wǎng)絡(luò),可以為交通安全相關(guān)應(yīng)用提供良好的通信保障,而一種能夠適應(yīng)車(chē)載自組織網(wǎng)絡(luò)運(yùn)行場(chǎng)景的無(wú)線(xiàn)接入?yún)f(xié)議則是這種保障的基礎(chǔ)。本文在分析研究現(xiàn)有IEEE802.11p協(xié)議以及各種國(guó)內(nèi)外相關(guān)文獻(xiàn)的基礎(chǔ)上,針對(duì)協(xié)議中控制信道時(shí)隙在網(wǎng)絡(luò)擁擠的狀態(tài)下無(wú)法滿(mǎn)足大量安全控制信息傳輸?shù)膯?wèn)題,對(duì)協(xié)議提出了改進(jìn)方法。 首先,本文對(duì)無(wú)線(xiàn)接入?yún)f(xié)議IEEE802.11p進(jìn)行了研究和分析,介紹了國(guó)內(nèi)外相關(guān)領(lǐng)域的研究現(xiàn)狀。以及對(duì)協(xié)議中所使用的CSMA/CA機(jī)制的馬爾科夫模型的推導(dǎo),總結(jié)出協(xié)議中存在的在網(wǎng)絡(luò)擁擠狀態(tài)下安全信息無(wú)法及時(shí)傳輸以及業(yè)務(wù)信道未得到充分利用的問(wèn)題。 其次,通過(guò)對(duì)問(wèn)題成因的分析,對(duì)原協(xié)議提出四點(diǎn)改進(jìn)意見(jiàn)。分別是： 1、WAVE服務(wù)集節(jié)點(diǎn)通過(guò)讀取廣播消息實(shí)現(xiàn)服務(wù)集節(jié)點(diǎn)數(shù)目感聽(tīng)與控制； 2、提出在業(yè)務(wù)信道時(shí)隙輔助發(fā)送安全信息的方法和策略； 3、WAVE多服務(wù)集分配業(yè)務(wù)信道方法； 4、WBSS的生命周期策略。 通過(guò)這些改進(jìn)策略,改進(jìn)協(xié)議的數(shù)據(jù)發(fā)送時(shí)延等關(guān)鍵性能指標(biāo)。 最后,使用OPNET仿真軟件對(duì)IEEE802.11p協(xié)議進(jìn)行了仿真。實(shí)現(xiàn)了不同速度場(chǎng)景,不同節(jié)點(diǎn)數(shù)場(chǎng)景,以及同一場(chǎng)景不同信道負(fù)載的多種情況的性能仿真。結(jié)果表明：改進(jìn)策略對(duì)原協(xié)議的時(shí)延、丟包率以及吞吐量均有較好的改善。
[Abstract]:In recent years, with the development of intelligent transportation system (its), the development of vehicle-road collaborative system has attracted much attention. As an important part of intelligent transportation system, vehicle-road coordination system can make vehicles. The information interaction between vehicles and roadside infrastructure is more timely and effective to optimize the use of system resources, improve road traffic safety, alleviate traffic congestion. It can provide good communication guarantee for traffic safety related applications. A wireless access protocol which can adapt to the mobile ad hoc network is the basis of this kind of guarantee. This paper analyzes and studies the existing IEEE802.11p protocol and the basis of various domestic and foreign related literature. On the basis. Aiming at the problem that the control channel time slots in the protocol can not satisfy a large amount of security control information transmission under the condition of network congestion, this paper proposes an improved method for the protocol. Firstly, this paper studies and analyzes the wireless access protocol (IEEE802.11p). This paper introduces the research status of related fields at home and abroad, and the derivation of Markov model of CSMA/CA mechanism used in the protocol. This paper summarizes the problems in the protocol that the security information can not be transmitted in time under the condition of network congestion and that the traffic channel is not fully utilized. Secondly, through the analysis of the causes of the problem, the paper puts forward four suggestions to improve the original agreement. They are: (1) the number of service set nodes can be sensed and controlled by reading broadcast messages; (2) the method and strategy of sending security information in traffic channel time slot are put forward. 3WAVE multi-service set assignment channel method; 4 the life cycle strategy of WBSS. Through these improved strategies, the data transmission delay and other key performance indicators of the protocol are improved. Finally, the IEEE802.11p protocol is simulated by using OPNET simulation software. Different speed scenarios and different node points scenarios are realized. The simulation results show that the improved scheme can improve the delay, packet loss rate and throughput of the original protocol.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U495;TN915.04

【共引文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 欒輝;基于AODV的無(wú)線(xiàn)網(wǎng)狀網(wǎng)協(xié)議的設(shè)計(jì)與仿真[D];哈爾濱工業(yè)大學(xué);2013年

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本文編號(hào)：1433683