本文選題：VANET網(wǎng)絡(luò) + 車輛移動(dòng)模型��； 參考：《長(zhǎng)安大學(xué)》2017年碩士論文

【摘要】：車載自組織網(wǎng)絡(luò)(VANET,Vehicular Ad Hoc Network)具有車輛節(jié)點(diǎn)高速運(yùn)動(dòng)、網(wǎng)絡(luò)拓?fù)渥兓l繁等特征,極易造成車輛間鏈路頻繁斷開(kāi)、網(wǎng)絡(luò)性能嚴(yán)重受損。因此,設(shè)計(jì)一種適用于VANET網(wǎng)絡(luò)的高效路由算法對(duì)于網(wǎng)絡(luò)性能的提升至關(guān)重要,同時(shí)對(duì)于城市交通擁堵和交通安全的改善具有重要意義。本文主要是在Linux系統(tǒng)上搭建了交通與網(wǎng)絡(luò)的聯(lián)合仿真平臺(tái),分析AODV協(xié)議應(yīng)用于VANET場(chǎng)景下的性能及應(yīng)用缺陷,設(shè)計(jì)了一種基于AODV協(xié)議的改進(jìn)協(xié)議—LS_AODV(Improved AODV Routing Protocol Based on Link Stability),主要研究工作如下:(1)分析了幾種經(jīng)典的車輛移動(dòng)模型及其原理,重點(diǎn)研究了符合VANET網(wǎng)絡(luò)環(huán)境的車輛移動(dòng)模型,在導(dǎo)入城市道路拓?fù)浣Y(jié)構(gòu)的基礎(chǔ)上,設(shè)計(jì)了一種帶有換道、超車功能的車輛移動(dòng)模型,使仿真環(huán)境與實(shí)際交通環(huán)境更吻合,最后利用軟件VanetMobiSim對(duì)車輛移動(dòng)模型進(jìn)行了仿真。(2)基于車輛移動(dòng)模型對(duì)AODV路由協(xié)議進(jìn)行仿真和性能評(píng)估。通過(guò)搭建VanetMobiSim與NS2聯(lián)合仿真平臺(tái)對(duì)AODV協(xié)議進(jìn)行仿真,并分析車輛行駛速度、車輛節(jié)點(diǎn)數(shù)目和數(shù)據(jù)包發(fā)送速度的變化對(duì)網(wǎng)絡(luò)性能所造成的影響。仿真結(jié)果表明,車輛行駛速度、車輛節(jié)點(diǎn)數(shù)目以及數(shù)據(jù)包發(fā)送速度的增加會(huì)使網(wǎng)絡(luò)端到端平均時(shí)延增大,數(shù)據(jù)丟包率增多,數(shù)據(jù)分組投遞率減小,從而導(dǎo)致網(wǎng)絡(luò)性能下降。(3)分析AODV路由協(xié)議應(yīng)用于VANET網(wǎng)絡(luò)的缺陷,設(shè)計(jì)了一種性能更好的LS_AODV協(xié)議。首先,在路由發(fā)現(xiàn)階段提出優(yōu)先節(jié)點(diǎn)判斷機(jī)制選擇一部分轉(zhuǎn)發(fā)性能較好的節(jié)點(diǎn);其次,基于鏈路有效時(shí)間評(píng)估機(jī)制,從源節(jié)點(diǎn)到目的節(jié)點(diǎn)的多條路由中選擇鏈路有效時(shí)間最長(zhǎng)的路由作為主路徑進(jìn)行數(shù)據(jù)傳輸;最后,在路由維護(hù)階段提出兩種路由備份機(jī)制分別對(duì)局部路由和全局路由進(jìn)行修復(fù)。
[Abstract]:The vehicle-borne ad hoc Ad Hoc Network) is characterized by high speed movement of vehicle nodes and frequent changes in network topology. It is easy to cause frequent disconnection of links between vehicles and serious damage to network performance. Therefore, it is very important to design an efficient routing algorithm for VANET networks to improve the performance of the network, and to improve urban traffic congestion and traffic safety. In this paper, a joint simulation platform of traffic and network is built on Linux system, and the performance and application defects of AODV protocol in VANET scenario are analyzed. An improved AODV Routing Protocol Based on Link stabilization protocol based on AODV protocol is designed. The main research work is as follows: (1) this paper analyzes several classical vehicle mobility models and their principles, and focuses on the study of vehicle mobility models in accordance with the VANET network environment. Based on the introduction of urban road topology, a vehicle moving model with the function of changing lanes and overtaking is designed, which makes the simulation environment more consistent with the actual traffic environment. Finally, the vehicle movement model is simulated by software VanetMobiSim. (2) based on the vehicle movement model, the simulation and performance evaluation of AODV routing protocol are carried out. The AODV protocol is simulated by building a joint simulation platform of VanetMobiSim and NS2, and the influence of vehicle driving speed, the number of vehicle nodes and the packet sending speed on the network performance is analyzed. The simulation results show that the increase of vehicle speed, the number of vehicle nodes and the transmission speed of data packets will increase the average end-to-end delay, increase the data packet loss rate and decrease the data packet delivery rate. As a result of the network performance decline, we analyze the defects of AODV routing protocol applied to VANET network, and design a LS_AODV protocol with better performance. First of all, in the phase of routing discovery, the decision mechanism of priority nodes is proposed to select some nodes with good forwarding performance. Secondly, based on the link effective time evaluation mechanism, Among the multiple routes from source node to destination node, the route with the longest link effective time is selected as the main path for data transmission. Finally, two routing backup mechanisms are proposed in the maintenance phase to repair the local route and the global route respectively.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.5;U495

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本文編號(hào)：1977335