ims中基于策略的qos机制分析与分析

《ims中基于策略的qos机制分析与分析》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、l‘华北电力大学硕士学位论文摘要摘要IMS(IP多媒体子系统)由3GPP标准化组织在R5版本中提出，是下一代网络核心组成部分之一，未来的实时多媒体服务对于实时性和延迟的要求很高，需要QOS(服务质量)的支持，为了满足实时多媒体业务的需求，OoS是IMS急需解决的关键问题之一。本文首先介绍了IMS体系架构，分析了IMS的QoS机制以及无线网络端到端QoS信令建立流程。然后对基于策略的管理机制进行了深入分析与研究，并对SIP协议进行了扩展，且基于OPNET构建了仿真实现模型，着重对策略调度算法进行了仿真研究。本文提出了一种新的基于策略的QoS机制，并设计改进了PDF(策略决策功能模

2、块)的功能，最后通过仿真实验验证了方案的可行性，为今后的具体实现提供了直接的理论参考依据。关键词：IMS，QoS，SIP，策略机制ABSTRACTIPmultimediasubsystem(IMS)wasdefnedinrelease5forthefirsttimeby3GPP,themarkedcharacteristicsofwhichistheSIP-basedsessioncontrollingandaccess．irrelevant．Inthefuture,themultimediaservicesneedllighqualityonreal-timeanddelay

3、．QoS(QualityofService)guaranteeformultimediaservicesisaseriousissueinIMS．ThispaperintroducedtheoverallarchitectureofIMS．Thepolicy-basedQoSmanagementinIMSandtheend-to-endQoSsignalingflowinsessionsetupprocedurewereanalyzed．Thenpolicy-basedmanagementmechanismofthein-depthanalysisandresearchwast

4、aken．andextendedtheSIPprotoc01．OPNET．basedsimulationimplementationmodelwasconstruaed,focusing011thestrategyofthePolicyschedulingalgorithmssimulation．11璩traditionalQoSmechanismbasedonpolicyisanalyzed,andanowQoSmechanismbasedonpolicyisproposed．111enewmechanismimprovesthefunctionofPDF(PolicyDec

5、isionFunction)．Finally,simulationresultsverifiedthefeasibilityoftheschemeforthefutureprovide．LiYan—guan(Wirelesscommunication)DirectedbyAssociateprof．BaoHuiKEYWORDS：IMS，QoS，SIP'PolicyMechanism，●l符号表CoSCSCSCFDifjfservDSCPETSIFGNGNFIFoFQGGSNGPSGPRSGSMHSSI．CSCFIETFIMSIQIntServIP．CANITUITU．TLDAP

6、MGCFClassofServiceCircuitSwitchedDommnCallSessionControlFunctionDifferentiatedServicesDifjfservCodePointEuropeanTelecommunicationsStandardsInstituteon第三代移动通信第三代合作伙伴组织输入输出排队公共开放策略服务服务级别电路交换域呼叫会话控制功能区分服务标记FocusGrouponNextGenerationNetworksFirstInFirst0utFairQueuingGatewayGPRSSupportNodeGeneral

7、ProcessorSharingGeneralPacketRadioServiceGlobalSystemMobileHomeSubscriberServerInterrogating-CSCFIntemetEngineeringTaskForceIPMultimediaSubsystemInputQueuedIntegratedServicesIPConnectivityAccessNetworkInternationalTelecommunicationUnionITU．Telecomm