ipovermpeg网关中多协议封装的研究和实现

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1、本文结合我们课题组对IPOverMPEG网关的开发工作，讨论了对其中多协议封装(MultiprotocolEncapsulation)模块的设计和实现，文中给出了软件的功能框图，类的继承关系，几个主要类的实现。还给出了多协议封装实现的软件流程图，对软件中一些重要函数的算法进行了较为具体的阐述。此外还介绍了对封装后的数据进行还原的方法，给出了实验数据验生成的码流经上海交通大学图像所的分析，完全符合标准，证明软件已完成了数据封装的主要功能象还探讨了在系统层面上封装的优化方案本文在项目的进一步开发工作中，可以参考这些方案。关键字:多协议封装;IPOverMPEG网关;传输流犷MPEG-2;DVBA

2、STUDYANDIMPLEMENTATIONOFMULTIPROTOCOLENCAPSULATIONINIPOVERMPEGGATEWAYABSTRACTItisnodoubtthattheDigitalTelevision(DTV)systemwillbethefuturebroadcastingmodeinsteadofanalogicTVsystem.TheDTVsystemcannotonlyprovidehighqualityANprograms,savethefrequencyresource,butalsoprovidevariousdigitalservices.Inrece

3、ntyears,theDTVsystemhassteppedintothebusinessfieldfromthepureresearchfield,andisbecomingahugeindustry.Itsfutureisprosperous.ChinaisaverybigTVconsumingcountry.WiththeuprisingofDTV,thehugemarketingpotentwillbeturnedintoplentyofprofit.AsanimportantpartoftheDTVsystem,DataBroadcastingsystemcanbeusedtopr

4、ovideefficientandeconomicalbroadbandInternetaccessapplicationsorothervalue-addedservices.InChinaDTVisstillinitsinfancy,andtheresearchonhowtouseDataBroadcastingsystemtoprovidebroadbandaccessapplicationsisverylimited.Soitisveryimportanttomakesomestudyonthisfield.TheIPOverMPEGGatewayisanimportantparti

5、nDataBroadcastingsystem.ItcanencapsulateIPdatagramintoMPEG-2TSpacketsandthentheIPdatagramcanbetransportedoverDTVchannels.Bythisway,thesubscriberscanenjoyhighqualityandeconomicalInternetservicesattheirhome.Inthispaper,someresearchhasbeendoneontheGatewayandtheMultiprotocolEncapsulationwasachieved.The

6、maincontentofthispaperisasfollows:First,thepapergivesabriefintroductiontothestandardorganizationsinDigitalTelevision,thereferencemodelofbroadbandInternetaccessapplicationsoverDVBDataBroadcastingsystemisintroduced,andtheconclusionthattheIPOverMPEGGatewayisthekeycomponentofthismodelisgiven.Second,the

7、paperanalysestheDataBroadcastingprotocolstackinDVB.TheseprotocolsarebasicstandardsindevelopingtheIPOverMPEG理卜Gateway,andTheseanalysesmakeclearthehierarchyoftheprotocolstack.Third,thepaperpaymoreattentionont