端到端实时通信业务的拥塞控制策略及改进

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1、上海交通大学硕士学位论文端到端实时通信业务的拥塞控制策略及改进姓名：甘泉申请学位级别：硕士专业：通信与信息系统指导教师：薛质20081201申请上海交通大学工学硕士学位论文传送实时业务的质量将受到数据传输时延抖动较大影响的问题提出了改进算法TFRC-ODJimprovedTFRCalgorithmaimingatcontrollingOne-wayDelayJitters以单向传输时延抖动为反馈信号来修正TFRC的发送速率加强了TFRC算法的性能使之更适应端到端实时通信业务的要求并以NS仿真实验验证了在保持TCP友好性的同时T

2、FRC-ODJ算法相对于TFRC显著地提高了单向传输时延的平滑性另外本文还提出了一种基于接收端计算的对TCP友好拥塞控制算法TFRC-BRCTFRCBasedonReceiver’sComputing主要目的在于减少发送端的处理负担由接收端来进行速率计算以满足有此类需求的实时业务系统的要求通过NS软件仿真将TFRC-BRC算法与TFRC协议进行对比研究后发现TFRC-BRC协议在TCP友好性和速率时延的平滑性等方面具有良好的综合性能可以很好地应用于服务器-客户端模式等实时业务环境关键词拥塞控制端到端传输实时业务TCP友好性-i

3、i-申请上海交通大学工学硕士学位论文STUDYANDMODIFICATIONSOFEND-TO-ENDCONGESTIONCONTROLMECHANISMFORREALTIMESTREAMABSTRACTWiththerapiddevelopmentofmodernnetworktechnology,networkwhichactsasthefourthmediahasbeguntogivepeoplemorekindsofinformationmode.Real-timecommunicationisdevelopingra

4、pidlyglobally.IP-basednetworkshavebecomeimportantplatformtotransmitreal-timecommunication.TCPisoneofthemajortransportprotocolsofIPnetwork.Itswindow-basedcongestioncontrolmechanismisoneoftheimportantfactorstoensureInternetstable.ButTCPprotocolanditscongestioncontrolm

5、echanismsarenotsuitablefortherequirementindelay-sensitiveandrate-smoothingofreal-timestream.SoanotherimportanttransportprotocolcalledUDPisusedtotransmitreal-timestream.AlthoughUDPcouldonlyprovideconnectionless,unreliabledatagramservice,itcouldmeettherequirementofpac

6、ketlossrate,delayandrate-smoothingforreal-timestreamtransmissionbyaddingsomeprotocolstosupportreal-timeandcongestioncontrolmechanismsonit.Withtherapiddevelopmentofreal-timeapplicationsonthenetwork,non-TCPdatagramtakeagrowingproportioninthenetworks,suchasInternet.Int

7、hepast,non-TCPstreamswillmaintaintheirownsendingratesregardlessofnetworkstateasnotrestrictedbycongestioncontrol.ThismaycausethebandwidthusedbyTCPstreamstogetsmallerandsmalleruntilzero.Andmoreandmorepacketsdiscardedonthewayandmaybesentrepeatedlywhichwillevenleadtocol

8、lapseofthenetwork.Therefore,itwillmakeimportantsignificancetostudycongestioncontrolmechanismsofnon-TCPtraffics,sothattheycouldusebandwidth