电信行业--建构於IP之无线多媒体技术及应用(PPT 96页)

建構於IP之無線多媒體技術及應用WirelessMulti-mediaoverIP：TechnologiesandApplications主持人：李琳山共同主持人：貝蘇章，吳家麟參與研究教授：鄭士康，陳良基，陳志宏，馮世邁李宇旼，歐陽明，陳文進，黃肇雄卓越計畫NationalTaiwanUniversity来自中国最大的资料库下载大綱•計劃主題及目標•本年度主要工作項目•本年度重要成績舉例及展示•計劃產出列表•下年度工作計劃•總檢討及結論卓越計畫NationalTaiwanUniversity来自中国最大的资料库下载方向調整•90年度教育部考評委員會評語：–“在原核定項目下進行良好，唯有若干核定項目與電信關連性較低，應考慮調整計劃重心”•90年7月決定調整方向：“智慧型訊號處理與多媒體資訊環境”(IntelligentSignalProcessingandMulti-mediaInformationEnvironment)“建構於IP之無線多媒體技術及應用”(WirelessMulti-mediaoverIP:TechnologiesandApplications)•以無線通訊及IP環境下之多媒體技術為主軸卓越計畫NationalTaiwanUniversity来自•Multi–media,Multi–lingual,Multi–functionalities•Cross–cultures,Cross–domains,Cross–regions•IntegratingAllKnowledge/Information/ServicesGlobally•MostAttractiveRepresentationforKnowledge/Information/ServiceswillbeinformofMulti-mediaSignalsFutureIntegratedNetworksReal–timeInformation–weather,traffic–flightschedule–stockprice–sportsscoresElectronicCommerce–virtualbanking–on–linetransactions–on–lineinvestmentsKnowledgeArchieves–digitallibraries–virtualmuseumsIntelligentWorkingEnvironment–e–mailprocessors–intelligentagents–teleconferencing–distantlearningPrivateServices–personalnotebook–businessdatabases–homeappliances–networkentertainments卓越計畫NationalTaiwanUniversity来自•NetworkAccessatAnyTime,fromAnywhere•PersonalNotebooks,Handsets,PDA’s,Hand-heldDevices…•SmallinSize,LightinWeight,Ubiquitous…•Keyboard/MouseMostConvenientforPC’snotConvenientanylonger–humanfingersnevershrink,andapplicationenvironmentischanged•Multi-mediaSignalswillbetheMostConvenientInterfaceforALLUserTerminalsatAnyTime,fromAnywhereFutureNetworksPublicInformationandServicesPrivateandPersonalServices卓越計畫NationalTaiwanUniversity来自•InformationFlowfromServerstoUsersviaBothWiredandWirelessNetworks•ManyDifferentNetworkTechnologiesforWiredandWirelessCo-existingWebServerCorporateIntranetIntelligentAgentWLANAPCoreNetworkBroadbandWirelessAccess3GCellularSystemsEDGE/UWC-136ATMorIPBackboneTheInternetPSTN卓越計畫NationalTaiwanUniversity来自•WirelessLinks–examples:PersonalAreaNetworks(Bluetooth,etc.),WirelessLAN(IEEE802.11),Cellular(GSM,GPRS,3G),etc.–time-varyingfadingandnoisecharacteristics–time-varyingsignallevelandsignal-to-noiseratios–burstyerrorswithmuchhighererrorrates–muchsmalleranddynamicbandwidth,muchlowerandchangingbitrates–highlyunreliable–supportingmobility:atanytime,fromanywhereApplicationLevelCoreTechnologiesTransportLevelTransportLayerNetworkLayer(IP)LinkLevelDataLinkLayerPhysicalLayer卓越計畫NationalTaiwanUniversity来自•UDP/IP-Real-time,NoRetransmission/DelayasinTCP/IP–ErrorsPacketLossReal-timeTransmissionwithLostInformation–PacketsoutofSequence•ProblemsofWirelessMulti-media–multi-mediaapplicationsrequirereal-timecontinuoustransmissionofhugequantitiesofdata–smalleranddynamicbandwidthoffersonlylimitedandtime-varyingdatarates–burstyerrorswithhighererrorratesaredifficulttocorrect–errorstranslatedtopacketloss,whicharenotacceptable–packetsoutofsequencealsocreatingproblems–time-varyingtransmissionqualityevenvariesacrossdifferentwirelesstechnologiesApplicationLevelCoreTechnologiesTransportLevelTransportLayerNetworkLayer(IP)LinkLevelDataLinkLayerPhysicalLayer卓越計畫NationalTaiwanUniversity来自•ImprovedLinkLevelTechnologies–betterlinkquality•EnhancedTransportLevelProtocols–toaccommodatemulti-mediatrafficandlinkunreliability•Developing“ConvergenceFunctionalities”intheApplicationLevel–wirelesslinklevelproblemsandtransportlevelvariationsbecometransparentto“coretechnologies”–“coretechnologies”shieldedfromandequallyapplicabletoalldifferentlink/transportenvironments–examples:scalability,errorconcealment,etc.•Robust“CoreTechnologies”includingIntelligentUserInterfaces–Combattingwithresidualerrors–Examples:signalverification,errorresilience,etc.–IntelligentuserinterfacefordifferentterminalsApplicationCoreTechnologiesLevelConvergenceFunctionalitiesTransportLevelTransportLayerNetworkLayer(IP)LinkLevelDataLinkLayerPhysicalLayer卓越計畫NationalTaiwanUniversity来自–virtualreality–video–audio–speech–textBasicSignalProcessing–analysis–segmentation–detectionCompression&TransmissionInformationRetrievalRobustnessIntelligentUserInterfacesothers…LevelConvergenceFunctionalitiesErrorConcealmentScalabilityothers…TransportLevelTransportLayerNetworkLayer(IP)LinkLevelDataLinkLayerPhysicalLayerWirelessMulti-mediaoverIP卓越計畫NationalTaiwanUniversity来自•MostLink/TransportLevelTechnologieshavebeen