EPON中MAC协议和带宽分配的研究

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1、西南交通大学硕士学位论文EPON中MAC协议和带宽分配的研究姓名：车静涛申请学位级别：硕士专业：通信与信息系统指导教师：潘炜20080501西南交通大学硕士研究生学位论文第1l页AbstractSincetherapiddevelopmentofthenetworktechnology,theaccessnetworkhasbecomethebottle—neckofthewholenetwork．EthernetPassiveOpticalNetwork(EPON)integratesthesimplicityofEthernet，thehighbandwidthoftheop

2、ticaltransfer,andtechnologyofPassiveOpticalNetwork(PON)．EPONemergestobeapromisingcandidateforthenext-generationbroadbandaccessnetworks．Inthedownstreamdirection，OpticalLinkTerminal(OLT)broadcastspacketstoallOpticalNetworkUnit(oNu)．Intheupstreamdirection，multipleONUssharethesametransmissionchan

3、nelunderthecontrolofamulti-pointaccessschemeanddynamicbandwidthallocation(DBA)．Recently，upstreamaccessandDBA,whichhaveimportantmeaninginimprovingthequalityofservice(OoS)andreducingpacketdelay,havebecomeahottopicforlocalarea．TheresearchismainlyfocusedonthedynamicbandwidthallocationschemesofEPO

4、Nupstreamchannel．Firstly,thisthesisdiscussedthedevelopmentoftheaccessnetwork，somekindsofcomparisonofPON．ThenfromdefinitionofEPONsystem，weilluminatestructureofEPONsystemandoperationprinciple，upanddownframe，analyzesthecharacteristicsandkeytechniquesofEPON．Secondly,forthestaticbandwidthallocatio

5、nandbasicDBAalgorithm(IPACTalgorithm)，weanalyzesomestrategyproblemsintheprocessofbandwidthallocation，suchaspriorityqueuingschedulingandinterleavedpollingschemeshouldbctakeninaccounttoguaranteetheQoS．AfteranalyzingthedisadvantagesofthecurrentDBAalgorithms，thisthesispresentsanovelOoS-guaranteed

6、PredictedDBAalgorithm(AMDBA)inEPON．Toavoidthe”T+2”queuingdelayofhighpriorityservices，thealgorithmpredictsbandwidthrequirementsfordifferentservicesinasupercyclewhichismadeupofmulti—subcycles，andinasubcycleweallocatetheguaranteedbandwidthbyreferringtothepredictedolle．Besides，weaddaccessmanageme

7、nt(AM)moduleswhichhelptoobtainsteadyQoS．AndappropriatecontrolwillpreventthehackerfromsendingdatamorethantheirserviceIevel．Simulationresultsshowthat西南交通大学硕士研究生学位论文第1lI页AMDBAalgorithmcannotonlyimprovetheutilizationofbandwidtheffectivelyandmeett