电信行业G行动通讯与VoI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：488.99億元台灣灣3G執照照拍拍賣賣(續續)執照照ＡＡ：：2x15MHz(1920~1935MHz;2110~2125MHz)+5MHz(1915~1920MHz)執照照B：：2x10MHz(1935~1945MHz;2125~2135MHz)+5MHz(2010~2015MHz)執照照C：：2x15MHz(1945~1960MHz;2135~2150MHz)+5MHz(2015~2020MHz)執照照D：：2x15MHz(1960~1975MHz;2150~2165MHz)+5MHz(2020~2025MHz)執照照E：：2x20MHz(825~845MHz;870~890MHz)3G拍賣賣趨趨勢勢1Q20002Q20003Q20004Q20001H20012H2001LiechtensteinSpainUKJapanNetherlandsGermanyItalyAustriaNorwaySwitzerlandSwedenPortugalFinlandFrance5xWCDMA6xWCDMA2xWCDMA1xCDMA20001xWCDMA4xWCDMA4xWCDMA5xWCDMA5xWCDMA4xWCDMA4xWCDMA4xWCDMA6xWCDMAS.Korea5xWCDMA2xWCDMA1xCDMA2000DenmarkGreeceIrelandHongKongTaiwanCzechBelgium3xWCDMA73WCDMAlicencesawardedplusmoretocome……(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.1710~1785MHz1805~1880MHzTDD:timedivisionduplexUplinkanddownlinkusethesamefrequency,buttransmitsignalsatdifferenttime.1895~1918MHz1895~1918MHzFDMA:frequencydivisionmultipleaccessUsersusedifferentfrequencycarriers200kHz/channelforGSM

Channel#1Channel#2TDMA:timedivisionmultipleaccessEachcarriercancontainmanyusers,buttheyusethesamecarrieratdifferenttimeslots.channel#1timeslot#1channel#1timeslot#2TDMA/TDDPHSfromJapanCarrierspacingis300kHzT1T2T3T4R1R2R3R4UplinkdownlinktimeCchCchUser1User2User3User1User2User3TDMA/FDDGSMCarrierspacingis200kHzEachcarriercontains8usersT1T2T3T4T5T6T7T8R1R2R3R4R5R6R7R8uplinkfrequencydownlinkfrequencyCDMA:codedivisionmultipleaccessWirelessApplicationsPerson-to-person(communications)servicesMobileE-commerceservices:video1and2Travel/locationbasedservicesRemotediagnosticsTelemetryservicesMobileoffice(business)servicesEntertainment/leisureservices:video1and2Conclusions3Gwillprovidewiderangeofvoiceandnon-voiceserviceincludingcircuit/packetswitchingandmultimediaservice.Itispossiblefor3Gtocreatenewapplicationsinacost-effectivemanner.MobileandtheInternetwillbethemajordemanddriversforthefutureVoIP網網際際網網路路電電VoIP網友友評評論論:*最最近近很很紅紅的的一一個個對對談談軟軟體體Skype(繁繁體體中中文文語語言言包包)用用了了P2P技技術術,過過防防火火牆牆後後還還是是超超級級清清楚楚,美美東東與與台台灣灣連連線線時時對對方方說說話話就就像像坐坐在在正正對對面面一一樣樣,讓讓我我徹徹底底對對網網路路語語音音軟軟體體改改觀觀,想想想想以以前前用用yahoomessenger或或MSN那那種種模模糊糊延延遲遲的的語語音音真真是是好好笑笑.然然後後因因為為它它免免費費又又太太清清楚楚,介介紹紹親親友友後後我我已已經經很很久久沒沒花花錢錢打打國國際際電電話話了了.*清晰度一一級棒，即即時通和MSN根本本無法比啊啊！

並且且即時通和和MSN都都只能單向向發話，而而SKYPE完全跟跟電話一模模一樣！目目前試用用過：台灣灣→台灣、、大陸、加加拿大、東東京超清晰晰，完全沒沒有延遲的的狀況！使使用藍芽芽耳機，爽爽度更是百