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1、ComputerCommunications24(2001)105±123www.elsevier.com/locate/comcomUsingdynamiccon®gurationtomanageaqscalablemultimediadistributionsystemF.Kon*,R.H.Campbell,K.Nahrstedt1DepartmentofComputerScience,UniversityofIllinoisatUrbana-Champaign,1304WestSpring®eldAvenue,Urbana,IL61801-2987,USA
2、Received15March2000;accepted4September2000AbstractMultimediaapplicationsandinterfaceswillchangeradicallythewaycomputersystemswilllooklikeinthecomingyears.RadioandTVbroadcastingwillassumeadigitalformatandtheirdistributionnetworkswillbeintegratedtotheInternet.Existinghardwareandsoftwar
3、einfrastructures,however,areunabletoprovideallthescalability,¯exibility,andqualityofservice(QoS)thattheseapplicationsrequire.Wepresentaframeworkforbuildingscalableand¯exiblemultimediadistributionsystemsthatgreatlyimprovesthepossibilitiesfortheprovisionofqualityofserviceinlarge-scalen
4、etworks.Weshowhowtousearchitectural-awareness,mobileagents,andaCORBA-basedframeworktosupportdynamic(re)con®guration,ef®cientcodedistribution,andfault-tolerance.Thisapproachcanbeappliednotonlyformultimediadistribution,butalsoforanyQoS-sensitivedistributedapplication.q2001ElsevierScien
5、ceB.V.Allrightsreserved.Keywords:Multimediadistribution;Dynamiccon®guration;Middleware;CORBA;QoS-awareresourcemanagement1.IntroductiononarchitecturesfordistributingdigitalmultimediacontentthroughtheInternetandintranetinfrastructures.Inparticu-Multimediainterfaceswillplayafundamentalr
6、oleinlar,researchersworkingonthetechnologiesrelatedtothehuman±computerinteractioninnextgenerationcomputerMBone[1,2]andtoadaptiveaudiovisualstreamingproto-systems.Applicationswillgraduallyabandondullinter-cols[3,4]providedsigni®cantcontributions.Wenoticed,facesbasedontextandstaticgrap
7、hicsandmovetowardshowever,thatexistingMBoneandunicastsolutionsdoamoreinterestinglookbasedonaudio,video,andanima-notprovidethedegreeofcontrol,¯exibility,andthepossi-tions.Withinonedecade,therewillprobablybenodistinc-bilitiesforQoSmanagementthatthenextgenerationappli-tionamongtheteleph
8、one,radio,TV
