本文關(guān)鍵詞： VANET GPSR 權(quán)重函數(shù) 鏈接穩(wěn)定性 時(shí)延　出處：《東華大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,隨著無線通信網(wǎng)絡(luò)技術(shù)的不斷發(fā)展和汽車保有量的不斷增多,車載自組織網(wǎng)絡(luò)(Vehicular Ad-hoc Network,VANET)作為智能交通系統(tǒng)的重要組成部分可以為駕駛者提供較為安全舒適的駕駛體驗(yàn)。而車載自組織網(wǎng)絡(luò)所具有的拓?fù)涓邉?dòng)態(tài)性等特點(diǎn),使得路由協(xié)議的研究極為重要。首先,本文對通信半徑相同情況下基于權(quán)重函數(shù)的GPSR(Greedy Perimeter Stateless Routing)協(xié)議進(jìn)行了研究。當(dāng)車輛在其通信半徑內(nèi)選擇下一跳節(jié)點(diǎn)時(shí),本文提出了一種權(quán)重函數(shù)WF(Weighted Function)來對下一跳候選節(jié)點(diǎn)進(jìn)行評估。在計(jì)算權(quán)重函數(shù)時(shí)綜合考慮了鏈接穩(wěn)定性,傳輸時(shí)延和節(jié)點(diǎn)運(yùn)動(dòng)方向等度量的影響,以達(dá)到增加鏈路可靠性、減少傳輸時(shí)延的目的。車輛將選擇下一跳候選節(jié)點(diǎn)中權(quán)重函數(shù)值最大的節(jié)點(diǎn)作為下一跳節(jié)點(diǎn)來傳遞信息�；谔岢龅臋�(quán)重函數(shù),針對GPSR協(xié)議中貪婪轉(zhuǎn)發(fā)引起的鏈路質(zhì)量較低的問題,提出了一種改進(jìn)的GPSR路由協(xié)議——WF-GPSR(Weighted Function based GPSR)。該協(xié)議改進(jìn)了傳統(tǒng)的GPSR協(xié)議的路由發(fā)現(xiàn)和路由維護(hù)過程,在數(shù)據(jù)分組轉(zhuǎn)發(fā)的過程中利用權(quán)重函數(shù)綜合考慮鏈路穩(wěn)定性和傳輸時(shí)延。其次,本文對通信半徑不同情況下基于權(quán)重函數(shù)的GPSR協(xié)議進(jìn)行了研究。針對通信半徑不同情況下貪婪轉(zhuǎn)發(fā)有時(shí)不能使跳數(shù)最小以及GPSR協(xié)議中鏈路質(zhì)量較低等問題,提出了一種下一跳候選節(jié)點(diǎn)到目的節(jié)點(diǎn)的最小跳數(shù)預(yù)測方法,并對之前提出的權(quán)重函數(shù)進(jìn)行改進(jìn)�；诟倪M(jìn)之后的權(quán)重函數(shù),進(jìn)行下一跳中繼節(jié)點(diǎn)的選擇,進(jìn)而改進(jìn)GPSR路由協(xié)議,提出一種適用于通信半徑不同情下的WF-GPSR協(xié)議。該協(xié)議可以兼顧鏈接穩(wěn)定性和傳輸時(shí)延,從而獲得更好的服務(wù)質(zhì)量。最后,本文分別對通信半徑相同情況下和通信半徑不同情況下提出的WF-GPSR協(xié)議進(jìn)行了仿真分析。通過VanetMobiSim搭建仿真場景,使用NS-2仿真軟件對路由協(xié)議進(jìn)行仿真。仿真結(jié)果表明,兩種情況下的WF-GPSR協(xié)議都比傳統(tǒng)的GPSR協(xié)議鏈路穩(wěn)定性更好,數(shù)據(jù)包到達(dá)率更高。同時(shí),WF-GPSR協(xié)議與GPSR協(xié)議相比在鏈路穩(wěn)定性和傳輸時(shí)延方面更加均衡。
[Abstract]:In recent years, with the continuous development of wireless communication network technology and the increasing number of vehicles, As an important part of intelligent transportation system, vehicular Ad-hoc network can provide drivers with safe and comfortable driving experience. It makes the research of routing protocol extremely important. Firstly, this paper studies the GPSR(Greedy Perimeter Stateless routing protocol based on weight function under the same communication radius. When the vehicle selects the next hop node in its communication radius, In this paper, a weight function (WF(Weighted function) is proposed to evaluate the candidate nodes in the next hop. In order to increase the reliability of the link, the influence of link stability, transmission delay and the direction of the node motion are considered in the calculation of the weight function. The purpose of reducing transmission delay. The vehicle will select the node with the largest weight function in the next hop candidate node as the next hop node to transfer information. In order to solve the problem of low link quality caused by greedy forwarding in GPSR protocol, an improved GPSR routing protocol, WF-GPSR-weighted Function based GPSRN, is proposed, which improves the routing discovery and maintenance process of the traditional GPSR protocol. In the process of data packet forwarding, the weight function is used to consider the link stability and transmission delay. Secondly, In this paper, the weight function based GPSR protocol with different communication radius is studied, aiming at the problem that greedy forwarding can not make the minimum hops and the link quality is low in GPSR protocol under different communication radius. In this paper, a prediction method of minimum hops from candidate node to destination node is proposed, and the weight function is improved. Based on the improved weight function, the next hop relay node is selected. Then the GPSR routing protocol is improved, and a new WF-GPSR protocol is proposed, which is suitable for non-sympathetic communication radius. This protocol can achieve better quality of service (QoS) by taking into account the link stability and transmission delay. In this paper, the WF-GPSR protocol with the same communication radius and different communication radius is simulated and analyzed. The simulation scenario is built by VanetMobiSim, and the routing protocol is simulated by NS-2 simulation software. The simulation results show that, In both cases, the WF-GPSR protocol has better link stability and higher packet arrival rate than the traditional GPSR protocol, and the WF-GPSR protocol is more balanced in terms of link stability and transmission delay than that of the GPSR protocol.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.5;U495

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本文編號：1500802