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1、1000-9825/2003/14(03)0503©2003JournalofSoftware软件学报Vol.14,No.3∗大时滞网络中的拥塞控制算法1+122任丰原,林闯,任勇,山秀明1(清华大学计算机科学与技术系,北京100084)2(清华大学电子工程系,北京100084)CongestionControlAlgorithminLarge-DelayNetworks1+122RENFeng-Yuan,LINChuang,RENYong,SHANXiu-Ming1(DepartmentofComputerScienceandTe
2、chnology,TsinghuaUniversity,Beijing100084,China)2(DepartmentofElectronicEngineering,TsinghuaUniversity,Beijing100084,China)+Correspondingauthor:Phn:86-10-62783596,Fax:86-10-62771138,E-mail:renfy@csnet1.cs.tsinghua.edu.cnhttp://www.cs.tsinghua.edu.cnReceived2002-01-22;A
3、ccepted2002-07-01RenFY,LinC,RenY,ShanXM.Congestioncontrolalgorithminlarge-delaynetworks.JournalofSoftware,2003,14(3):503~511.Abstract:AQM(activequeuemanagement)canmaintainthesmallerqueuingdelayandhigherthroughputbythepurposefullydroppingthepacketsattheintermediatenodes
4、.ItisahotspotinthecurrentresearchesaboutTCPend-to-endcongestioncontrol.Almostalltheexistedalgorithmsneglecttheimpactonperformancecausedbylargedelay.Inthisstudy,firstlyafactthroughsimulationexperimentsisverified,whichisthequeuescontrolledbyseveraltypicalAQMalgorithms,in
5、cludingRED,PIcontrollerandREM,thedramaticoscillationsinlargedelaynetworksareappeared,whichdecreasestheutilizationofthebottlenecklinkandintroducestheavoidabledelayjitter.Aftersomeappropriatemodelapproximation,arobustAQMalgorithmapplyingtheprincipleofinternalmodecompensa
6、tionincontroltheoryisdesigned.Thenewalgorithmrestrictsthenegativeimpactonthequeuestabilitycausedbythelargedelay.Thesimulationexperimentalresultsshowthattheintegratedperformanceoftheproposedalgorithmisobviouslysuperiortothatoftheexistedschemeswhenthenetworkconfiguration
7、parametersarelargedelayandsmallqueuelength,andthelinkutilizationincreases3~4times.Keywords:congestioncontrol;internalmodecontrol;flowcontrol;largedelay;activequeuemanagement摘要:主动队列管理(AQM)通过网络中间节点有目的的分组丢弃实现了较低的排队延时和较高的有效吞吐量,是近年来TCP端到端拥塞控制的一个研究热点.已有的大多数AQM算法在设计过程中都没有充分考虑
8、到大∗SupportedbytheNationalNaturalScienceFoundationofChinaunderGrantNos.60273001,60173012(国家自然科学基金);theNationalHigh-Tec
