IPv6+over+DVB发送网关协议转换模块及监控的设计与实现

湖南大学硕士学位论文IPv6overDVB发送网关协议转换模块及监控的设计与实现姓名：王嘉申请学位级别：硕士专业：信号与信息处理指导教师：张大方20070618IDVB(DigitalVideoBroadcasting)DVBMPEG-2IPoverDVBDVBMPEG-2TSIPIPv4IPv6IPv6overDVBLinuxIPv6overDVBULEUnidirectionalLightweightEncapsulationULEMPEMulti-ProtocolEncapsulationULEMPEULEIPSNDUULEMACSNDUSNDUMPEG-2TSIPMPEG-2TSSNDUTSTSSNDUSNDUTSSNDUTSIPv4IPv6ULEMPEsocketIPoverDVBPIDPIDIPModemIPMPEG-2TSULEMPEIPv6LinuxIPv6overDVBIIAbstractDVBisdigitalvideobroadcastingspecification;DVBselectsMPEG-2Standardasthewayofencodingcompressionofaudioandvideo.WhenIPinformationispackedtoMPEG-2TSandtransmittedthroughDVBchannel,theprocessiscalledIPoverDVB.IPv6isbetterthanthepresentmainnetworkprotocolIPv4inextension,securityandsupportinghighqualityserviceforusers.Thebackgroundofthisthesisistheprojectof“theapplicationanddemonstrationresearchofIPv6overDVBindistancelearning”,whichisaimedtoutilizestheadvantageofsatellitechannel,distributesagreatdealofdatainabroadareainalowprice.Thistechnologyisespeciallysuitableforthevastareaofmiddle-westernChinaandpromotionalformoderndistancelearningofourcountry.Themainworkis:Firstly,thethesisdesignsandimplementstheprotocoltransformingmoduleofgatewayonLinuxplatform.ThismoduleuseULEUnidirectionalLightweightEncapsulationasthenewwayofencapsulation.ContrastingwithMPEMulti-ProtocolEncapsulation,ofwhichisusedbroadlynow,ULEreduces2/3controlfields,andhasabetterencapsulatingefficiency.AftercomparativeresearchonULEandMPEinencapsulatingspaceefficiency,delayandlostofpackets,thethesisdesignsandimplementstheULEprotocoltransformingmodule,whichputsIPdataintoSNDU’spayload,addsULEcontrolfieldsanddestinationMAC,afteracompleteSNDUissegmentedandplacedintotheMPEG-2TS’spayload,thetransformationofIPdatatoMPEG-2TSisfinished.Toreducethedifficultyofde-encapsulationandavoiderror,thisthesisusessomemethodstosimplifytheprotocoltransforminthisprocession,suchasonlyoneSNDUineveryTS,anewSNDUbeginninginanewTS,usingidentifyingbeginningpositionforfirstSNDUsegment.TheULEprotocoltransformingmodulesupportsIPv4andIPv6doubleprotocolstack,whichhasthebetterspaceefficiencyandtimeefficiencythanMPE.Secondly,thethesisdesignsandimplementsthemonitorofgateway.Thismodulecansendmonitormessages,receive,parseandshowfeedbackmessages.Thisthesisdesign5monitormessagesand5feedbackmessages.Usingthesemessagesmonitorcanconfigure,requireandsetPIDdynamicallythroughsocket,sothemonitorcansetseveralPIDtotransmittheIPdatatosatellite,andparsethefeedbackmessageinrealtime;monitorthestatusoftheModem;limittheflowofeachPIDtopreventthesatellitefromoverpressureinaccordancewiththesuppliedbandofIIIsatelliteandtherequirementoftransmitteddata.Finally,theresultsoftestinginlaboratoryenvironmentandindistancelearningapplicationprovetheprotocoltransformingmodulecanrunaccurately,theULEisbetterthanMPEintheencapsulatingtime,andtheprotocoltransformingmoduleandmonitorhasgoodstabilization.KeyWords:IPv6;DVB;ULE;MPE;Linux;monitorIPv6overDVBIV1.1.............................................................................21.2IPv6overDVB..............................................................................21.3.............................................................................32.1IPv6overDVB-S.............................................................102.2..............................................................................112.3Linux....................................................................122.4Windows...............................................................132.5DVB.....................................................................................142.6IPDVB......................................................................152.7IP...............................................................................152.8..........................................................................................162.9......................................................................................162.10....................................................................................162.11........................................................................................172.12....................................................................................183.1..........................................................................................193.2MPEG-2TS.................................................................................193.3IPv6.....................................................................................203.4IP.........................................................................................223.5MPESNDU....................................................................233.6ULESNDU.....................................................................243.7MPEULE.............................................................253.8MPEULE....................................................................263.9MPEULE................................................................263.10..........................................................