电信行业--GPRS之架构、服务以及应用(PPT 102页)

来自之架構、服務以及應用来自★Data:NoFrequency:824~893MHzTACSData:No2ndGeneration1997199819992000DigitalTextmessagingCDPDN/AN/A824~893MHzTextmessagingHSCSDGPRSEDGE9.6~14.464115~144384Kbps900,1800,1900MHzTestmessagingCSDforCDMAPSDforCDMAN/AN/AN/ATextmessagingPDCP9.6~14.4N/A1800~1900MHz3rdGeneration200120022003UMTSW-CDMACDMA2000Frequency1885~2025MHzand2110~2200MHzSpeed115~2048KbpsGSMDataSpeed(kbps)FrequencyCDMADataSpeed(kbps)FrequencyPDCDataSpeed(kbps)FrequencyDAMPS/TDMADataSpeedkbpsFrequency資料來源：JardineFlemingResearch，資策會MIC来自中国最大的资料库下载未來無線資訊的發展—無線寬頻資訊(WirelessData)EvolvingGSMWirelessApplicationProtocalSource:GSA,andTCC19851997199920002001/20021stgeneration-Analog-basedsystems2ndgeneration-Digitalradiosystemsoncircuit-switchtelecomnetworks,lowdataspeeds1stgeneration2ndgenerationAMPSGSMHSCSDGPRSEDGEW-CDMA3rdgeneration9.6kbps57.6kbps115kbps384kbps2Mbps1.SMSMessaging2.WebMail3.InformationServices4.FinancialServices-InformationAccess5.FinancialServices-transactions6.Mobilebroking7.MobileShopping8.InternetAccess来自:MDI,WAP,JavaPDA,SmartPhonesShareduseofradioresourcespacketswitchedtransmissionComfortablespeedNewcodingschemes&channelcombiningValueaddedservicesExtensionsofcorporate,intranet,&internetapplicationsReasonablecostsVolumeorientedaccountingDataServices:fromGSMtoGPRS来自HighertransmissionratesfournewcodingschemesallowdifferentdataratesofCS-19.05kbit/s,CS-213.4kbit/s(in10/00)CS-315.6kbit/s,CS-421.4kbit/s(inE/01)channelcombiningIncreasedradioresourceefficiencyradioresourceswillbeusedonlyduringdatatransmissionsharedaccessofthesamechannelConnectionofGSMandIPworldVolumedependentcharging•Fastersessionset-up•Alwaysconnected来自中国最大的资料库下载WAP-enabledGPRSterminals/handsetswillprovideeasyaccesstotheworldofinformationatyourfingertipsApplicationServer:anIdealTransportforWAP来自中国最大的资料库下载•Userreceivesbasicallythesameinformation,butwithGPRSbetterpresentationofinformationpossible•WAPoverGSMisinefficientuseofradioresources•WAPoverGSMistooexpensive•WAPoverGSMistooslowTrafficAlert:MotorwayA8fromMünchentoNürnbergcongestedAlternativeroute:leavemotorwayatX-DorfandfollowtheorangesignsOKOKGSMGPRSX-DorfY-DorfNürnbergMünchenA8TrafficAlert:WAPMigrationfromGSMtoGPRS来自ISDNservicesVideotelephonyWidebanddataservicesComputerInternetaccessElectronicmailReal-timeimagetransferMultimediadocumenttransferMobilecomputingVideoondemandInteractivevideoservicesTV/radio/datacontribution&distribution–mobility–widebandservicesUMTS–mobility–highspeedservices–mobility–personalservicesTelecommunication来自第二代與第三代行動通訊整合架構示意圖来自網路服務概念圖BSSSSSPSTN(Voice)InternetWAPVPNGPRSGSM&GPRSsystemUTRANU_MSC3Gsystem来自GPRS網路的發展背景GPRS網路的通訊架構GRPS網路的無線通訊介面来自網路的發展背景GSM的缺點從GSM升級到GPR来自的缺點GSM通訊系統是為語音通話而設計GSM資料傳輸速率只有9.6Kbps每次傳輸數據都必須撥接上網計費方式以連線時間計算来自GPRS(GeneralPacketRadioService)改良GSM傳輸資料的缺點在原有GSM上加入2個網路設備GGSN,SGSN改善資料傳輸方式Circuit-SwitchPacket-Switch来自在網路Transmitter與Receiver間建立一個固定的通道不管有無傳送資都保留了固定的頻寬應用在對延遲非常Sensitivity上来自在Transmitter將資料切割成一段段的封包(package)多個Transmitter可同時共同使用一個頻道當多個Transmitter傳輸時，通道在會出現擁塞現象来自–偶發性傳送之應用服務Burstiness程度愈高的應用服務適合以Package-Switch的方式傳送如：、GGSN(1)来自、GGSN(2)原有的GSM網路設備負責circuit-switch的傳送--Voice新加入的GPRS網路設備(SGSN、GGSN)之數據交換(Data、Signaling)皆用packet-switch來傳送--Data来自中国最大的资料