无线有线混合网络中传输控制协议的研究

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1、中南大学博士学位论文无线/有线混合网络中传输控制协议的研究姓名：叶进申请学位级别：博士专业：计算机应用技术指导教师：王建新20081201解决方法相比，具有更好的吞吐量和公平性。建立高效的差错控制机制和使用丢包区分算法能够保证混合网络的传输效率，精确的拥塞感知和跨层的优化设计将显著提高混合网络的服务质量。本文从以上几个方面展开了深入的研究，提出了实用的方案，获得了预期的效果。本文的工作能够有力推动边缘无线化网络的发展。随着研究成果应用于移动产品，可以抵抗恶劣的网络环境，为用户提供更加丰富、稳定的服务。关键词拥塞控制，TCP，ECN，主动队列管

2、理，跨层设计ABSTRACTWiththerapiddevelopmentofwirelesstechnology,wirelessnetworkshavebecometheimportantpartofInteract．PacketlossasaresultoffactorsotherthancongestionimpacttheperformanceofTCPinwired／wirelesshybridnetworks，whichincludethedisconnectionofwirelessmediaatphysicallayer,t

3、heacce．ssfailureatMAClayer,routingchangeatnetworklayer,andSOon．TraditionalTCPprotocolsuseallpacketlossastheindicatorofcongestionanddecreasethesendingrateunnecessarily．Asaresult，TCPperformancedegradesinwired／wirelesshybridnetworks．MostexistingTCPprotocolsaredesignedforsomesi

4、nglenetworkcircumstances．Withrespecttohybridnetworkscomposedofheterogeneousnetworks，problemsthathowtokeeptransmissionefficiencyhavenotbeensolvedinasatisfactoryway．Consideringtheseproblems，thispaperfocusesonhowtoimproveperformanceoftransportcontrolprotocoloverwired／wirelessh

5、ybridnetworks．Themainapproachesarepacketlossesdifferentiation，congestionperceptionandcross—layerdesign．Maincontributionsofthispaperinclude：1．Presentinganadaptivelossdifferentiationalgorithmbasedonqueuemanagement，A_BQM，whichCanadptivelyadjustthemethodofmatchthelOSScharactero

6、nmidrouters．SimulationresultsshowthatA_BQMcanobtainhigherdifferentiationaccuracyandsimplerimplementthanBQM．2．Presentingacongestionperceptionmethod，CP_ECN，whichcalculatescongestionprobabilitybasedonseveralECNfeedbacks．Itcaninfernetworkstatesinamorereasonableway．Bothexamplesa

7、ndsimulationsindicatethatthepredictionsofCParecorrespondingtorealsituationsinhybridnetworks．3．ApplyingCP—ECNintotwoTCPprotocols，RenoandWestwood．TheirperformancesareevaluatedinnetworksimulationsandaLinuxtestbedofhybridnetworks．ResultsshowthattheycanimproveIlItransmissioneffi

8、ciencyandprotocolsbyusingCPECNmethodisofgoodfairnessandfriendliness．4·Presentingac