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1、hierarchicaldecodercoderhierarchicaldecodercoderTRASHFigure2:HierarchicalcodingandeffectsofpacketlossApplicationTeleconference,etc.Encoding/CompressionPresentationErrorConcealement/RecoveryCipheringSessionManagementSessionQualityTuningTransportErrorControlNetworkCommunicationSubnetDataL
2、inkPhysicalProvidingQOS‘‘Guarantees’’Figure3:PositioningofSomeImportantFunctionsforMultimediaCommunicationsUsingDigitalCon-tinuousMediawithRespecttotheISOOSIReferenceModel.NetworkandOperatingSystemSupportforMultimediaApplicationsJosephC.Pasquale,GeorgeC.Polyzos,EricW.Anderson,KevinR.Fal
3、l,JonathanS.Kay,VachaspathiP.Kompella,ScottR.McMullan,andDiptiRanganathanComputerSystemsLaboratoryDepartmentofComputerScienceandEngineeringUniversityofCalifornia,SanDiegoLaJolla,CA92093-0114TechnicalReportCS91-186March1991AbstractThispaperdescribesthegeneralproblemsinprovidingsystemsoft
4、waresupportformultimediaapplications.Wespeci®callyfocusonapplicationswhichhavedigitalcontinuousmedia(DCM)I/Ocomponents,andthetypeofsup-portthatmustbeprovidedbythenetworksoftwareandoperatingsystem.DCMapplicationshavelargebandwidthandlowdelayrequirements.Wediscussnetworksoftwaresupporttom
5、eettheserequirements,suchasresourcereservationschemesbasedonparameterizedrequestsforsomelevelofqualityofservice.Mostlikely,DCMcommunicationswillbelong-lived,whichsuggeststhatconnectionsaretheappropri-atenetworkconstructforsuchcommunications.Regardingtheoperatingsystem,wedescribeissuesof
6、real-timeresourcescheduling,synchronizationofprocessesandtemporallyrelatedDCM¯ows,sharedmemory,andtheneedforamodular,uniformI/Oabstraction.Finally,wepresentdesignprinciplesbasedontheconceptsofmovingprocessestodataandseparatingdesignfromimple-mentationasimportantconsiderationsforsystemso
7、ftwaredesign.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhThisresearchissupportedinpartbytheNationalScienceFoundation,thePowellFoundation,DigitalEquipmentCorporation,NCRCorporation,andtheUCMicroProgram.JosephPasqualemaybecontactedbye-mailatpasquale@ucsd.eduorbytelephoneat(619)534-2673.G
