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1、ADistributedMultimediaCommunicationSystemandits*ApplicationstoE-LearningHansL.Cycon,ThomasC.Schmidt,MatthiasWählisch,MarkPalkowandHenrikRegensburgTheincreasingvideo/audioqualityandtheeasy-to-useuserinterfacecombinedwithallkindsofapplicationsharingwillAbstract—Inthispaperwe
2、reportonamultimediacommu-soonconvincemoreandmoreuserstoenrichtheircommuni-nicationsystemincludingaVCoIP(VideoConferencingovercationhabitsbyvideocomponents.IP)softwarewithadistributedarchitectureanditsapplica-Thistrendisalsofoundinteachingandlearningscenarios.tionsforteachi
3、ngscenarios.Itisasimple,ready-to-useThereisarisingnumberofInternet/Intranet-backedcoursesatschemefordistributedpresenting,recordingandstreaminguniversitiesorprivatecompanies.Herealsothemailandmultimediacontent.Wealsointroduceandinvestigatecon-voicecommunicationwillbesupple
4、mentedbysynchronousceptsandexperimentstoIPv6userandsessionmobility,withandasynchronousvideocomponents.thespecialfocusonreal-timevideogroupcommunication.AsasecondtrendwirelessInternetconquerstheairwaves.Theavailabilityofnew,trulymobileIPenabledsubnetworklayersnotonlyoffersc
5、onnectivitytonomadicusersatroam-IndexTerms—Videoandmultimediaconferencing,E-ingdevices,preservingcommunicationsessionsbeyondIPlearning,MobileIPv6,MulticastMobilitysubnetchanges,butre-raisesquestionsconcerningthequalityofIPservice:Theconstantbitratescenariosofvoiceandvid-I.
6、INTRODUCTIONeoconferencingwillappearsignificantlydisturbedbypacketlossintervals,delaysorjitterexceeding100ms.Thus,whenheadingtowardsVCoIPasastandardInternetservice,impor-AparadigmshiftisunderwayintheInternet.Networkedtantstepsforglobalusabilityhavetobetaken,focusingondevic
7、es,formerlysituatedonthedesksofscientistandbusi-easeandquality.ness,arenowconsumerpartsandprovideinformation,com-Inthepresentpaperwereportonamultimediacommunica-municationandentertainment.Visualdevicesperformingsyn-tionsystemincludingaVCoIPsoftwarewithadistributedchronousc
8、ommunicationsuchasvoiceorvideoconferencingarchitectureanditsapplicationsforteachingscenar
