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1、運(yùn)動(dòng)模型與AdHoe路由協(xié)議性能仿真摘要有線網(wǎng)絡(luò)在時(shí)間和空間的靈活性上受到極大束縛,隨著網(wǎng)絡(luò)技術(shù)的高速發(fā)展,移動(dòng)無(wú)線通信網(wǎng)絡(luò)應(yīng)運(yùn)而生。傳統(tǒng)的移動(dòng)無(wú)線通信網(wǎng)絡(luò)以蜂窩移動(dòng)通信網(wǎng)絡(luò)和無(wú)線局域網(wǎng)兩種方式為主,它們都需要在現(xiàn)有的基礎(chǔ)設(shè)施條件下建網(wǎng),這兩種方式都不適用于無(wú)基礎(chǔ)設(shè)施可利用的臨時(shí)或緊急組網(wǎng)。移動(dòng)AdHoc網(wǎng)絡(luò)的出現(xiàn)使人們隨時(shí)隨地進(jìn)行通信的愿望成為現(xiàn)實(shí),它具有組網(wǎng)速度快、抗毀白愈能力強(qiáng)等優(yōu)點(diǎn),適用于軍事作戰(zhàn)系統(tǒng),也適用于需要緊急部署通信網(wǎng)絡(luò)的突發(fā)事件現(xiàn)場(chǎng)。AdHoc網(wǎng)絡(luò)是一種沒有有線基礎(chǔ)設(shè)施支持的移動(dòng)網(wǎng)絡(luò),網(wǎng)絡(luò)中的節(jié)點(diǎn)均可由移動(dòng)主機(jī)構(gòu)成。該網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)、通信模式與以往的網(wǎng)絡(luò)都有所不同,因此,移
2、動(dòng)AdHoe網(wǎng)絡(luò)路由協(xié)議成為近年來(lái)研究的一個(gè)熱點(diǎn)。路由協(xié)議性能仿真是AdHoc路由協(xié)議研究中采取的最直接的方式,但是,縱觀以往的性能仿真研究可以看出,仿真往往都是基于簡(jiǎn)單的節(jié)點(diǎn)運(yùn)動(dòng)模型,比如隨機(jī)停留點(diǎn)模型(RandomWaypointMobilityModel)來(lái)進(jìn)行的。這些模型往往不能正確模擬該網(wǎng)絡(luò)中的節(jié)點(diǎn)拓?fù)浜瓦\(yùn)動(dòng)規(guī)律。本文對(duì)移動(dòng)AdHoe路由協(xié)議性能仿真中使用的節(jié)點(diǎn)運(yùn)動(dòng)模型進(jìn)行了研究,指出當(dāng)前廣泛使用的運(yùn)動(dòng)模型存在的問(wèn)題,并針對(duì)移動(dòng)AdHoc網(wǎng)絡(luò)的特點(diǎn)提出幾種適合的網(wǎng)絡(luò)模型,論證節(jié)點(diǎn)運(yùn)動(dòng)模型對(duì)移動(dòng)AdHoe路由協(xié)議性能仿真帶來(lái)的影響關(guān)鍵詞:移動(dòng)AdHoc網(wǎng)絡(luò),運(yùn)動(dòng)模型,路由協(xié)議,性能仿真
3、MOBILⅡ'YMODELSANDPERFORML蝌CESIMI,N棚ONOFADHOCNETWORKSROUTINGPROTOCOLSABSTRACTThetraditionalwirednetworksarealwaysrestrictedduetoltsspatialandtemporallimit.Wirelessnetworkscomeintobeingandfixthisgapgreatly.WirelessnetworksmainlyconsistofMobileCellularNetworksandWirelessLAN,bothofwhichneedinfrastructur
4、esupportandarenotappropriateforemergencyuse.ButmobileAdHocnetworksappearandmakepeople’Sdream,thatancancommunicateonthego,becometrue.Thiskindofnetworkscanbesetupquickly,andareofgreatrobustness.Itcanbeusedformilitarysystemandotheremergencieswhichneedimmediateandsimplenetworkssetup.AdHociSakindofmobile
5、networkwithoutinfrastructure,whichconsistofmobiledevices.Itstopologyandcommunicationpatternaredifferentfrompreviousones.Recently,theperformanceevaluationofitsroutingprotocolbecomesmoreandmorefamousamongrelatedresearchers.SimulationISthemostdirectwayforroutingprotocolresearchofMobileAdHocnetworks.But
6、thepreviousworksarealwaysbasedonsomesimplemobilitymodels,suchasRandomWaypointMobilityModel.Thesemodelscan’tcorrectlysimulatethepropertyofAdHocnetworks,especiallyforthetopologyandmobilitypatterns.Inthisdissertation,IhaveadeepresearchonthemobilitymodelsforroutingprotocolsperformanceevaluationofMobileA
7、dHocnetworks,presentadetailedanalysisofthepopularmodel—RandomWaypointMobilityModel.Atlast,thesimulationresultshowsthatdifferentmobilitymodesgreatlyimpacttheperformanceofroutingprotocols.KEYWORDS:Mobil