EPON系统中动态带宽分配算法的研究

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1、北京交通大学硕士学位论文EPON系统中动态带宽分配算法的研究姓名：符锐申请学位级别：硕士专业：通信与信息系统指导教师：孙强20080501关键词：以太无源光网络；动态带宽分配；服务质量；延时分类号：TN929．11ABSTRACTABSTRACT：Inrecentyears，withthefastdevelopmentofcommunicationindustry,networktransmissionabilityhasbeenimprovedalot．Therearegreatchangesinthebackboneofcommunic

2、ationnetworks，butfewerintheaccessnetwork．WhilethedemandofinformationalsocietyforInteractservicesisdramaticallyincreasing，accessnetworkstillremainsthebottleneckbetweenhigh-capacitylocalareanetworkandthebackbonenetwork．Although，currentbroadbandaccessmethods，suchasADSLCableMo

3、dem，LAN，haveprovidedhigherbandwidthandwidelyused，theystillcannotsatisfyusers’requestsandhavenoabilitytoprovideenoughbandwidthfornewnetwork’Sservicessuchasvideomeeting,VOIP,刚andSOon，henceanewbroadbandaccesstechniqueisneededtosatisfyusers’demandsofbandwidthinthefuture．Asthef

4、iberhastheadvantagesoflow-cost，broadbandwidth，powerfulresistingjammingabilityetc，itisverysuitabletobethetransportmediaofhigh-speedbroadbandnetwork．ThankingoftheactualityoftheIPnetworkandtheabilityofPONtransport，EPONisregardedasoneofthemainsolutiontoimplementfuturebroadband

5、accessnetwork．DynamicbandwidthallocationoftheuplinkhasbecomeahottechniqueinEPONsystemduetotheuplink'sONUsharingbandwidthtopologystructure，whichhasgreatsignificancetoreducepacketdelayandimproveQualityofService．Firstly,thisthesisintroducesthedevelopmentoftheaccessnetwork，som

6、ekindsofcomparisonofaccessnetworkandtheadvantageofEPONtechnique．ThenfromdefinitionofEPONsystem，weilluminatethesystemstructureandworkingprinciple，analyzethekeytechniquesandrelationalprotocolsofEPONsystem．Afteranalyzingthemeritsandweaknessesofexistingalgorithms，anoveldynamic

7、bandwidthallocationalgorithmisproposed，whichsupportmulti—serviceandguaranteeQualityofService．Thekeypointofthisalgorithmistoclassifytheupstreamservicesintohighpriorityservice，middlepriorityserviceandlowpriorityservice．Thewholeuplinkcycleispartitionedintotwosub-cyclestotrans

8、mithighpriorityservice，middleandlowpriorityaggregatedservicesrespectively,accordingtothed