电信行业-3G行动通讯与VoIP网际电话之企业应用与发展

3G行動通訊與VoIP網際電話之企業應用與發展ContentIntroductiontoTelecommunications3GLicensesAuctionUMTSWCDMAWirelessApplicationsVoIP&itsImplementationConclusionsCellularPhoneGenerations1G:AMPS(AdvancedMobilePhoneSystem)=>analogsystem2G:GSM(GlobalSystemforMobilecommunication)=>digitalsystem2.5G:GPRS(GeneralPacketRadioSystem)3G:IMT-2000(InternationalMobileTelecommunicationforyears2000)DigitalServicesVision032649.61281443842,0001G2G3GVoiceTextMessagingVideoStreamingStillImagingAudioStreamingDataTransmissionSpeed-kbpsElectronicNewspaperRemoteMedicalService(Medicalimage)VideoConference(Highquality)Telephone(Voice)VoiceMailE-MailFaxElectronicPublishingVideoonDemand:Sports,NewsWeather

KaraokeVideoConference(Lowerquality)JPEGStillPhotosMobileRadioViideoSurveillance,VideoMail,TravelImageAudioVoice-drivenWebPagesStreamingAudioDataWeather,Traffic,News,Sports,StockupdatesMobileTVE-CommerceSource:MotorolaMobileCommunicationEvolutionMobilePhoneStandardsNetworkevolutionconvergence2Gto3Gevolution3G執照-歐洲資料台灣3G執照拍賣執照Ａ：遠致電信，101.69億元執照B：聯邦電信，77億元執照C：台灣大哥大，102.81億元執照D：中華電信，101.79億元執照E：亞太行動寬頻，105.7億元總計：488.99億元台灣3G執照拍賣(續)執照Ａ：2x15MHz(1920~1935MHz;2110~2125MHz)+ 5MHz(1915~1920MHz)執照B：2x10MHz(1935~1945MHz;2125~2135MHz)+ 5MHz(2010~2015MHz)執照C：2x15MHz(1945~1960MHz;2135~2150MHz)+ 5MHz(2015~2020MHz)執照D：2x15MHz(1960~1975MHz;2150~2165MHz)+ 5MHz(2020~2025MHz)執照E：2x20MHz(825~845MHz;870~890MHz)3G拍賣趨勢1Q20002Q20003Q20004Q20001H20012H2001LiechtensteinSpainUKJapanNetherlandsGermanyItalyAustriaNorwaySwitzerlandSwedenPortugalFinlandFrance5xWCDMA6xWCDMA2xWCDMA

1xCDMA20001xWCDMA4xWCDMA4xWCDMA5xWCDMA5xWCDMA4xWCDMA4xWCDMA4xWCDMA6xWCDMAS.Korea5xWCDMA2xWCDMA

1xCDMA2000DenmarkGreeceIrelandHongKongTaiwanCzechBelgium3xWCDMA73WCDMAlicencesawarded

plusmoretocome…(120byend2001)Vs13CDMA2000networksplanned(outofwhich2alreadyoptedforWCDMA)AustraliaNewZealandSingapore4xWCDMA4xWCDMA5xWCDMAGPRSNetwork115kbpsusing8timeslotsSGSN:ServingGPRSSupportNode

電路交換封包交換GPRS核心InternetGPRS骨幹IP網路MSCBSCSGSNGGSNBTS網路開始有效時間:3Q2000PSTN3GNetwork384kbps~2Mbps電路交換封包交換GPRS核心PSTNInternetGPRS骨幹IP網路MSCBSCSGSNGGSNBTSRNCBTSMobilemultimediastreamingPDAhandsetFDD:frequencydivisionduplex

Uplinkanddownlinkfrequenciesaredifferenceandaenoughfrequencyspacingmustbeexist.1710~1785

MHz1805~1880MHzTDD:timedivisionduplexUplinkanddownlinkusethesamefrequency,buttransmitsignalsatdifferenttime.1895~1918

MHz1895~1918

MHzFDMA:frequencydivisionmultipleaccessUsersusedifferentfrequencycarriers200kHz/channelforGSM

Channel#1Channel#2TDMA:timedivisionmultipleaccessEachcarriercancontainmanyusers,buttheyusethesamecarrieratdifferenttimeslots.channel#1

timeslot#1channel#1

timeslot#2TDMA/TDDPHSfromJapanCarrierspacingis300kHzT1T2T3T4R1R2R3R4UplinkdownlinktimeCchCchUser1User2User3User1User2User3TDMA/FDDGSMCarrierspacingis200kHzEachcarriercontains8usersT1T2T3T4T5T6T7T8R1R2R3R4R5R6R7R8uplink

frequencydownlink

frequencyCDMA:codedivisionmultipleaccessWirelessApplicationsPerson-to-person(communications)servicesMobileE-commerceservices:video

1

and2Travel/locationbasedservicesRemotediagnosticsTelemetryservicesMobileoffice(business)servicesEntertainment/leisureservices:video1

and2Conclusions3Gwillprovidewiderangeofvoiceandnon-voiceserviceincludingcircuit/packetswitchingandmultimediaservice.Itispossiblefor3Gtocreatenewapplicationsinacost-effectivemanner.MobileandtheInternetwillbethemajordemanddriversforthefutureVoIP網際網路電

Skype官方網站:/languagehtml台灣PCHOME說明:.tw/index.htm如果有需要常常打長途電話或國際電話的人,這玩意應該很實用.安裝容易以後國際電話公司可能要去喝西北風了.VoIP網友評論:*最近很紅的一個對談軟體Skype(繁體中文語言包)用了P2P技術,過防火牆後還是超級清楚,美東與台灣連線時對方說話就像坐在正對面一樣,讓我徹底對網路語音軟體改觀,想想以前用yahoomessenger或MSN那種模糊延遲的語音真是好笑.然後因為它免費又太清楚,介紹親友後我已經很久沒花錢打國際電話了.*清晰度一級棒，即時通和MSN根本無法比啊