下一代网络IMS系统中QoS机制的研究.pdf

单位代码：10293密级：硕士学位论文论文题目：下一代网络IMS系统中QoS机制的研究学号G040901022姓名论文摘要学科、：工学电子与通信工程研究方向：下一代网络技术作者：士学位论文摘要摘要随着网络科技的演进，多网络的整合被看作是将来网络的演进方向，网络整合即基于统一综合的网路进行各类信息的通信，使得客户可以借助不同的终端在任何时候，任何地点都可以享受无缝统一的通信服务。

IP多媒体子系统(IMS)是3GPP在R5提出的用于控制多媒体应用的平台。它从而集成移动通信与Internet技术而将Internet服务的强悍性能及丰富资源带入移动环境，它也被看作是将来网络整合的缓解方案。目前，IMS已经变成业界一个热点话题。随着多媒体业务的快速演进，传统的“尽力而为”的IP服务由于其不可分析的阈值和丢包性能，已不能满足他们更加下降的对业务品质的要求。网络科技的很大变化给打造新型网络的管理平台增添了挑战，也给基于IMS的下一代网络业务的服务品质管控(QoS)和保障带给了新的挑战，所以，如何确保IMS系统的服务品质作为了一个关键的难题。论文目的是要解决下一代网络中IMS的服务品质难题。本文首先介绍了IMS系统，结合QoS的通常原理与科技，分析了完善基于IMS的下一代网络QoS管理平台的大背景。之后，根据IMS的特征和服务品质管控的基本规定，深入探究了IMS中管理层、网络层和存储层的QoS控制体系的推动方案，并具体地剖析了基于策略的QoS管理、区分服务模型和SIP信令的QoS，在此基础上设计了一种基于策略的E2EQoS机制。

关键词：下一代网络；QoS；IMS；DiffServ；SIPIII南京邮电学院项目博士学位论文ABSTRACTAbstractTheIPMultimediaSubsystemorIPMultimediaCoreNetworkSubsystem(IMS)isanarchitecturalframeworkfordeliveringInternetProtocol(IP)multimediaservices.Itwasoriginallydesignedbythewirelessstandardsbody3rdGenerationPartnershipProject(3GPP),asapartofthevisionforevolvingmobilenetworksbeyondGSM.Itsoriginalformulation(3GPPRel-5)representedanapproachtodelivering"Internetservices"overGPRS.Thisvisionwaslaterupdatedby3GPP,3GPP2andETSITISPANbyrequiringsupportofnetworksotherthanGPRS,suchasWirelessLAN,CDMA2000andfixedline.ToeasetheintegrationwiththeInternet,IMSusesIETFprotocolswhereverpossible,e.g.SessionInitiationProtocol(SIP).Accordingtothe3GPP,IMSisnotintendedtostandardizeapplicationsbutrathertoaidtheaccessofmultimediaandvoiceapplicationsfromwirelessandwirelineterminals,i.e.createaformoffixed-mobileconvergence(FMC).Thisisdonebyhavingahorizontalcontrollayerthatisolatestheaccessnetworkfromtheservicelayer.Fromalogicalarchitectureperspective,servicesneednothavetheirowncontrolfunctions,asthecontrollayerisacommonhorizontallayer.Howeverinimplementationthisdoesnotnecessarilymapintogreaterreducedcostandcomplexity.AlternativeandoverlappingtechnologiesforaccessandprovisioningofservicesacrosswiredandwirelessnetworksincludecombinationsofGenericAccessNetwork,softswitchesand"naked"SIP.Alongwiththerapidgrowinguseofthemultimediaservices,theadedrequirementsofthequalitycannotbefulfilledbythetraditional"bestefort"IPservicewhichissubjecttounpredictabledelaysandloss.ThetremendouschangesinnetworktechnologyhasbroughtchallengestobuildanewnetworkmanagementsystemandalsotoIMS-basednextgenerationnetworkservicequality(QoS)management,SohowtoguaranteetheQoS(qualityofservice)inIMSbecomesacurialproblem.ThisthesisistoaddressQoSproblemofIMSinnextgenerationnetwork.ThethesisintroducestheIMSsystem,combinedwiththegeneralprinciplesandQoStechnologies.Thethesisalsoanalysisofthebuildingnext-generationIMS-basednetworkQoSmanagementsysteminthebackground.Then,accordingtoIMSfeaturesandservices,thebasicrequirementsofqualitymanagement,in-depthstudyoftheIMSmanagementlayer,networklayerandtransportlayerQoScontrolmechanismforimplementation,anddetailedanalysisofpolicy-basedQoSmanagement,DiffservmodelandSIPsignalingQoS,onthisbasis,proposedapolicy-basedE2EQoSmechanism.Keywords:NGN；QoS；IMS；DiffServ；SIPIV南京邮电学院项目博士学位论文第一章IMS概述目录第一章IMS概述...........................................................................................................................11.1IMS简介.........................................................................................................................11.2IMS主要应用.................................................................................................................21.3IMS产业链发展状况.....................................................................................................31.4IMS国内发展状况.........................................................................................................5第二章QoS的通常原理...............................................................................................................72.1QoS的定义和标准............................................................................................................72.1.1QoS的定义..............................................................................................................72.1.2QoS的技术指标......................................................................................................92.2各类业务的QoS要求....................................................................................................102.2.1语音业务...............................................................................................................102.2.2视频业务...............................................................................................................102.2.3数据业务...............................................................................................................102.3QoS的保障体系..............................................................................................................112.4常见的IPQoS机制.......................................................................................................112.4.1整合服务IntServ模型.........................................................................................122.4.2区分服务（DiffServ）模型.................................................................................162.4.3多协议标签交换（MPLS）................................................................................182.4.4几种IPQoS机制的非常.....................................................................................20第三章管理层面的服务品质.....................................................................................................223.1基于策略的QoS管理概念............................................................................................223.2IMS中的QoS控制架构.................................................................................................24IP承载服务管理器........................................................................................................24翻译/映射功能体............................................................................................................25UMTS承载服务管理器.................................................................................................25PDF..................................................................................................................................25PEP和PDP.....................................................................................................................25PDPContext(PDP上下文)..............................................................................................26Go接口...........................................................................................................................26Gq接口...........................................................................................................................263.3IMSQoS管理中的协议..................................................................................................263.4IMS中基于策略QoS控制体系的推动方案和信令机制探讨..................................27资源授权阶段.................................................................................................................29资源预留阶段.................................................................................................................31QoS的同意承诺过程.....................................................................................................32第四章网络层面的服务品质.....................................................................................................344.IIMS中区分服务模型......................................................................................................344.2IMS中区分服务平台架构..............................................................................................364.3区分服务调度算法的探究与优化..................................................................................384.3.1IMSDiffserv中调度算法的优化......................................................................384.4移动区分服务的研究......................................................................................................394.4.1移动Diffserv面临的难题.....................................................................................394.4.2基于策略的区别服务模型...................................................................................40V南京邮电学院项目博士学位论文第一章IMS概述第五章传输层面的服务品质.....................................................................................................455.1SCTP协议简介...............................................................................................................455.2SCTP协议特性...............................................................................................................455.3SCTP的两个重要扩展.....................................................................................................475.4SCTP在IMS网络中的性能改进...................................................................................475.5SIP信令的QoS...............................................................................................................485.5.1SIP协议概述.........................................................................................................495.5.2SIP协议传输层研究.............................................................................................505.5.3基于SIP扩展的支持区分等级呼叫处理的技术方案.......................................515.6SCTP传输实时多媒体数据的研究...............................................................................515.6.1UDP/RTP传输实时多媒体数据...........................................................................515.6.2PR一SCTP传输实时多媒体数据......................................................................525.7SCTP协议在其它方面的研究....................................................................................52第六章一种基于策略的E2EQoS机制....................................................................................556.1IMSPDF的改进.............................................................................................................556.2自适应允许控制算法.....................................................................................................576.3基于带宽调度组件的SIP协议扩展.............................................................................59第七章总结.................................................................................................................................62致谢...........................................................................................................................................63参考文献.......................................................................................................................................64VI南京邮电学院项目博士学位论文第一章IMS概述第一章IMS概述1.1IMS简介IMS（IPMutimediaSubsystem）是3GPP在Release5版本强调的支持IP多媒体业务的子平台，它的核心特征是运用SIP协议和与接入的无关性，目前IMS支持2G和3G的移动接入手段，还不能支持固定接入手段。

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