電信行業(yè)G行動通訊與VoI網(wǎng)際電話之企業(yè)應(yīng)用與發(fā)展

3G行動通訊與VoIP網(wǎng)際電話之企業(yè)應(yīng)用與發(fā)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(zhí)照-歐洲資料臺灣3G執(zhí)照拍賣執(zhí)照Ａ：遠致電信，101.69億元執(zhí)照B：聯(lián)邦電信，77億元執(zhí)照C：臺灣大哥大，102.81億元執(zhí)照D：中華電信，101.79億元執(zhí)照E：亞太行動寬頻，105.7億元總計：488.99億元臺灣灣3G執(zhí)照照拍拍賣賣(續(xù)續(xù))執(zhí)照照ＡＡ：：2x15MHz(1920~1935MHz;2110~2125MHz)+5MHz(1915~1920MHz)執(zhí)照照B：：2x10MHz(1935~1945MHz;2125~2135MHz)+5MHz(2010~2015MHz)執(zhí)照照C：：2x15MHz(1945~1960MHz;2135~2150MHz)+5MHz(2015~2020MHz)執(zhí)照照D：：2x15MHz(1960~1975MHz;2150~2165MHz)+5MHz(2020~2025MHz)執(zhí)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(wǎng)路MSCBSCSGSNGGSNBTS網(wǎng)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(wǎng)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(wǎng)網(wǎng)際際網(wǎng)網(wǎng)路路電電VoIP網(wǎng)友友評評論論:*最最近近很很紅紅的的一一個個對對談?wù)勡涇涹w體Skype(繁繁體體中中文文語語言言包包)用用了了P2P技技術(shù)術(shù),過過防防火火牆牆後後還還是是超超級級清清楚楚,美美東東與與臺臺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(wǎng)網(wǎng)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(jīng)經(jīng)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??！

並且且即時通和和MSN都都只能單向向發(fā)話，而而SKYPE完全跟跟電話一模模一樣！目目前試用用過：臺灣灣→臺灣、、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