网络系统建模分析与拥塞控制的若干问题研究

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1、南开大学博士学位论文网络系统建模分析与拥塞控制的若干问题研究姓名：陈华良申请学位级别：博士专业：控制理论与控制工程指导教师：陈增强20080401摘要为新建和改进网站提供了指导。(5)提出一种新的无标度网络的高效路由策略，以提高网络的传输能力，称之为加权路由策略。即对网络的每一条边加权，权值与该边的两端节点的度相关，然后数据包按照这个加权网络的最短路径路由。这样的路径可以更均匀地通过各个节点，发挥它们的传输能力，极大地提高网络的吞吐量。仿真显示，这个策略远比传统的最短路径策略优越，对很多结构的网络，可以极大地提高它们的吞吐量。关键词：复杂网络，无标度网络，神经网络，网络系统建

2、模，拥塞控制，路由策略，TCP吞吐量建模ⅡABSTRACTHumanbeingsliveintheworldmadeupofawidevarietyofcomplexnetworksystems．Itisessentiallyimportantforpeopletounderstandthesenetworks’structure，behaviorcharacteristicsanddevelopmentastheyarecloselyrelatedwithpeople’Slearning,workingandliving．Itisoneofthemostbasictasks

3、ofthenetworkresearchtomodelandanalyzetherealnetworksystems，whichCanhelppeopletoabetterunderstandingoftherelationshipbetweenthenetworkstructureandthenetworkperformance．Anotherimportanttaskofthenetworkresearchistocontrolthenetworkcongestionanddesigntheefficientroutingstrategy．Thenetworkconges

4、tionseriouslythreatstothestableoperationofthenetworkfunctions，SOitissignificanttoenhancethetrafficcapacityandavoidthecongestion．Inthisdissertation,thecongestioncontroloftheIntemet，theworldfamousnetworksystem，isfirstlyinvestigated，includingthemulticastcongestioncontrolmechanismsandtheTCPthro

5、ughputmodel，whichiswidelyusedinthecongestioncontrolprotocols．Theninthecontextofcomplexnetworks，thestructureofthreeChina’8universitywebsaremodeledandanalyzed．Atlast，basedonthescale．freenetworkmodel，anewroutingstrategyisproposedtoimprovethenetworkcapacityandavoidthecongestion．111emaininnovati

6、onsofthisdissertationareasfollows：(1)Withthein-depthanalysisandsimulation，twonewmechanisms(theadaptivessthreshandthenewackerswitchmechanism)areproposedforthefamouspragmaticgeneralmulticastcongestioncontrol(PGMCC)protocoltoreplaceitsoriginalinappropriatemechanisms．TheyCanhelpPGMCCimproveitsf

7、aimesswithTCPincertainsituations，suchasfrequentackerswitches．(2)Anewsingle-ratemulticastTCP—likecongestioncontrolscheme(PGMTCC)isproposed．TheprimaryideaofPGMTCCistoextendSackTCPcongestioncontroltomulticastinordertomakemulticastperformalmostthesameasSackT