1、3G行動通訊與 VoIP網際電話之企業應用與發展ContentnIntroduction to Telecommunicationsn3G Licenses AuctionnUMTS WCDMAnWireless ApplicationsnVoIP & its ImplementationnConclusionsCellular Phone Generationsn1G: AMPS (Advanced Mobile Phone System) = analog systemn2G: GSM (Global System for Mobile communication) = digital s
2、ystemn2.5G: GPRS (General Packet Radio System)n3G: IMT-2000 (International Mobile Telecommunication for years 2000)Digital Services Vision032649.61281443842,0001G2G3GVoiceVoiceText MessagingText MessagingVideo StreamingVideo StreamingStill Still ImagingImagingAudio StreamingAudio StreamingData Trans
3、mission Speed - k bps ElectronicNewspaperRemoteMedical Service(Medical image) Video Conference(High quality)Telephone (Voice)Voice MailE-MailFax ElectronicPublishing Video on Demand:Sports, News Weather Karaoke Video Conference(Lower quality)JPEG Still PhotosMobile RadioViideo Surveillance,Video Mai
4、l, TravelImageAudioVoice-driven Web PagesStreaming AudioDataWeather, Traffic, News,Sports, Stock updatesMobile TVE-CommerceSource:MotorolaMobile Communication EvolutionMobile Phone StandardsNetwork evolution convergence2G to 3G evolution3G執照 -歐洲資料台灣3G執照拍賣n執照：遠致電信，101.69億元n執照B：聯邦電信，77億元n執照C：台灣大哥大，102
5、.81億元n執照D：中華電信，101.79億元n執照E：亞太行動寬頻，105.7億元n總計：488.99億元台灣3G執照拍賣 (續)n執照：2x15MHz(19201935MHz;21102125MHz)+5MHz(19151920MHz)n執照B：2x10MHz(19351945MHz;21252135MHz)+5MHz(20102015MHz)n執照C：2x15MHz(19451960MHz;21352150MHz)+5MHz(20152020MHz)n執照D：2x15MHz(19601975MHz;21502165MHz)+5MHz(20202025MHz)n執照E：2x20MHz(82
6、5845MHz;870890MHz)3G 拍賣趨勢1Q 2000 2Q 2000 3Q 2000 4Q 2000 1H2001 2H2001LiechtensteinSpainUKJapanNetherlandsGermanyItalyAustriaNorwaySwitzerlandSwedenPortugalFinlandFrance5 x WCDMA6 x WCDMA2 x WCDMA1 x CDMA20001 x WCDMA4 x WCDMA4 x WCDMA5 x WCDMA5 x WCDMA4 x WCDMA4 x WCDMA4 x WCDMA6 x WCDMAS. Korea5 x
7、 WCDMA2 x WCDMA1 x CDMA2000DenmarkGreeceIrelandHong KongTaiwanCzechBelgium3 x WCDMA73 WCDMA licences awarded plus more to come (120 by end 2001)Vs13 CDMA2000 networks planned (out of which 2 already opted for WCDMA)AustraliaNew ZealandSingapore4 x WCDMA4 x WCDMA5 x WCDMAGPRS Networkn115 kbps using 8
8、 time slotsnSGSN: Serving GPRS Support Node GPRS 核心核心InternetGPRS 骨幹骨幹 IP 網路網路MSCBSCSGSNGGSNBTS網路開始有效時間網路開始有效時間網路開始有效時間網路開始有效時間: 3Q 2000: 3Q 2000PSTNPSTN3G Networkn384 kbps 2 MbpsGPRS 核心核心PSTNPSTNInternetGPRS 骨幹骨幹 IP 網網路路MSCBSCSGSNGGSNBTSRNCRNCBTSBTSMobile multimedia streamingPDA handsetFDD: frequen
9、cy division duplexnUplink and downlink frequencies are difference and a enough frequency spacing must be exist. 17101785 MHz18051880 MHzTDD: time division duplexnUplink and downlink use the same frequency, but transmit signals at different time.18951918 MHz18951918 MHzFDMA: frequency division multip
10、le accessnUsers use different frequency carriersn200 kHz/channel for GSMChannel #1Channel #2TDMA: time division multiple accessnEach carrier can contain many users, but they use the same carrier at different time slots.channel #1time slot #1channel #1time slot #2TDMA/TDDnPHS from JapannCarrier spaci
11、ng is 300 kHzT1T2T3T4R1R2R3R4UplinkdownlinktimeCchCchUser 1User 2User 3User 1User 2User 3TDMA/FDDnGSMnCarrier spacing is 200 kHznEach carrier contains 8 usersT1T2T3T4T5T6T7T8R1R2R3R4R5R6R7R8uplinkfrequencydownlinkfrequencyCDMA: code division multiple accessWireless ApplicationsnPerson-to-person (com
12、munications) services nMobile E-commerce services: video 1 and 2nTravel/location based servicesnRemote diagnostics nTelemetry servicesnMobile office (business) servicesn Entertainment/leisure services: video 1 and 2Conclusions 3Gwillprovidewiderangeofvoiceandnon-voiceserviceincludingcircuit/packetsw
13、itchingandmultimediaservice. Itispossiblefor3Gtocreatenewapplicationsinacost-effectivemanner.MobileandtheInternetwillbethemajordemanddriversforthefutureVoIP網際網路電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 yahoo messenger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！並且即時通和 MSN都只能單向發話，而SKYPE完全跟電話一模一樣！目前試用過：台灣台灣、大陸、加拿大、東京超清晰，完全沒有延遲的狀況！使用藍芽耳機，爽度更是百分之兩百啊*我有一個朋友的公司與外國的sales已經完全改用 skype. 一個月省了數十萬元的國際電話費。*今天試玩 4人confrence，XX當host，效果實在是太驚人了! 不止是每個人音質都很讚而且都沒有 delay 的感覺 ! 真的是推薦給大家用!節錄自 E天下6月號VoIP演讲完毕，谢谢观看！
