GSM培训教材-GPRS基础.pdf

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1、网优培训教材GSM新员工基础教材TechnologySupportDepartmentGPRS基本概念和系统结构GPRS基础TechnologySupportDepartmentGPRS基本概念和系统结构GPRSGPRS英文全称为GeneralPacketRadioService,即通用分组无线业务。GPRS是一种用于GSM的标准化分组交换数据业务，它使移动通信与数据通信相结合，将Internet协议的业务引入移动通信市场，提高手机上网速率的无线分组技术TechnologySupportDepartmentGPRS基本概念和系统结构G

2、PRS系统构成TechnologySupportDepartmentGPRS基本概念和系统结构GPRS网络结构TechnologySupportDepartmentGPRS基本概念和系统结构网元TE(TerminalEquipment)MS(MobileStation)BTS(BaseTransceiverStation)BSC(BaseStationController)MFS(Multi-BSCFastpacketServer)SGSN(GPRSSupportingNode)GGSN(GatewayGSN)PDN(P

3、acketDataNetwork)TechnologySupportDepartmentGPRS基本概念和系统结构GPRS无线系统接口GPRS无线接口信道Um(Air)PDCHAbisAbisnibbleAterGCHGbGbTSTechnologySupportDepartmentGPRS无线接口理论基础GPRS基础TechnologySupportDepartmentGPRS无线接口理论基础GPRSGeneralPacketRadioServiceClassA,B,C52multi-frameTechnology

4、SupportDepartmentGPRS无线接口理论基础TLLITemporaryLogicalLinkIdBetweenMSandSGSNP-TMSIPacketTMSI(TemporaryMobileSubscriberId)TLLI=P-TMSIinmajorcasesPDPaddressPacketDataProtocolBetweenMSandPDN10

5、GPRS基础

6、April2008TechnologySupportDepartmentGPRS无线接口理论基础临时块流(TBF)：一种在MS和MFS之间传送一个

7、或者多个LLCPDU的单向数据流一个PDCH上可以传送几个TBF（如TFI5）一个TBF可以在几个PDCH上传送（如TFI17和24）TBF由临时流标识（TFI）来识别。TechnologySupportDepartmentGPRS无线接口理论基础ULTBF建立时，MS会收到每个分配的PDCH的USF（上行链路状态标记，8种取值，MAC的头部字段）如果MS在PDCHi的下行链路块n中收到其USF，它就能够使用上行链路中的PDCHi的块n+1来传送数据。TechnologySupportDepartmentGPRS无线接口理论基础Tech

8、nologySupportDepartmentGPRS无线接口理论基础TechnologySupportDepartmentGPRS无线接口理论基础手机能力TechnologySupportDepartmentGMM状态及路由更新GPRS基础TechnologySupportDepartmentGMM状态及位置区Idle:theMSisnotattachedtothenetwork:pagingisnotpossibleStandby:theMSisattachedtothenetwork:pagingispossibletheM

9、SlocationisknowninCNwiththeRAaccuracyReady:theMSlocationisknownwiththecellaccuracytimerT_READYkeepstheMSintheReadystatejustafterdatatransferThetimersregulatingthetransitionbetweenstatesareSGSNtimers,nottunableintheBSS.Caution:IdlemodeinGPRSandIdlemodeisGSMaretwodiffere

10、ntstates.TheUEstateintheSGSNshallbeconsideredapartfromthepackettransfermodeintheBSS.TechnologySupportDe