考慮QoS保證的機(jī)會(huì)調(diào)度改進(jìn)算法研究.pdf

1、南京郵電大學(xué)碩士學(xué)位論文考慮QoS保證的機(jī)會(huì)調(diào)度改進(jìn)算法研究姓名：蔡靈靈申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：宋榮方20090401南京郵IU人學(xué)f嗍Ij研究生學(xué)位論文AbstractAbstractOpportunisticcommunicationhasattractedmuchattentioninrecentyearsTraditionallychannelfadingisvieweda，sasourceofunrel

2、iabilitythathastobemitigatedInthecontextofopportunisticsystem，howeverfadingcaninsteadbeconsideredasasourceofrandomizationthatcanbeexploitedOntheotherhand，dataservicesandmultimediaservicesareexpectedtoconstituteasignifica

3、ntpartoftrafficinthefuturewirelesscommunicationsystemAnddifferentserviceswouldhavediverseQualityofService(QoS)requirementsSo，optimizingthewirelessresourceallocationstrategytoincreasesystemcapacityandspectrumutilization，m

4、eanwhileprovidingQoSguaranteesfordifferentusersanddifferenttraffic，wouldbeacriticalprobleminthefutureresearchBasedonthemulti—useropportunisticsystemmodel，thisthesisanalyzestheopportunisticschedulingalgorithmsUnderMaxC／Ia

5、lgorithm，thehighestcellthroughputisachievedWhileusingRoundRobinalgorithm，completefairnessisachievedTheconventionalProportionalFaimess(PF)algorithmcanbetreatedasatrade—offofthroughputandfairnessButnoneofthethreealgorithms

6、supportsQoSThisthesispresentsamodifiedPFalgorithminordertoprovideQoSguarantees，bysettingdifferentweightedfactorsanddifferentlengthsofhistorywindowsaccordingtouserratesandthedelayrequirementsrespectivelyPerformanceanalysi