gprs外文翻译--理论研究通用分组无线业务

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1、山东科技大学外文翻译学院名称电气信息系专业班级电气工程及其自动化10-4班学生姓名梅玉金学号201003201414指导教师姚福强翟绪梅TheoreticalStudyoftheGeneralPacketRadioServiceAbstract:Ascommunicationstechnologycontinuestomatureandusers’qualityhavebecomeincreasinglydemanding,newdataapplicationsareemergingandarereac

2、hingthegeneralpublic.ThroughtheuseofGPRS(GeneralPacketRadioService)technology,theexistingGSMnetworkscanbeeasilyachievedwithsimplehigh-speeddatapacketaccess,enablingmobileoperatorstorespondrapidlytomarketdemandsandgaincompetitiveadvantage.Thispaperaimstop

3、rovideacomprehensiveyetsimpleoverviewoftheGPRSsystemfromtheuser’sandfromthearchitecturalperspectives.Keywords:GPRSnetworks;Voice/dataintegration;Multiple-channels;Packetradio;Telecommunications1IntroductionInthelate1800s,Marconididthepioneerworkestablish

4、ingthefirstsuccessfulradiolinkbetweenaland-basedstationandatugboat.Sincethen,wirelesscommunicationsystemshavebeendevelopingandevolvingwithafuriouspace.Thenumberofmobilesubscribershasbeengrowingtremendouslyinthepastdecades.Intheearlystages,wirelesscommuni

5、cationsystemsweredominatedbymilitaryusageandsupportedaccordingtomilitaryneedsandrequirements.Duringthelasthalfacentury,withincreasingcivilapplicationsofmobileservices,commercialwirelesscommunicationsystemshavebeentakingthelead.Theearlywirelesssystemscons

6、istedofabasestationwithahigh-powertransmitterandservedalargegeographicarea.Eachbasestationcouldserveonlyasmallnumberofusersandwascostlyaswell.ThesystemswereisolatedfromeachotherandonlyafewofthecommunicatedwiththePSTN(PublicSwitchedTelephoneNetworks).Toda

7、y,thecellularsystemsconsistofaclusterofba-sestationwithlowpowerradiotransmitters.Eachbasestationservesasmallcellwithinalargegeographicarea.Thetotalnumberofusersservedisincreasedbecauseofchannelreuseandal-solargerfrequencybandwidth.Globalsystemformobileco

8、mmunicationsistheEuropeanstandardforcellularcommunicationsdevelopedbytheETSI(EuropeanTelecommunicationsStandardsInstitute).ThroughoutEuropeandtherestoftheworld,GSMhasbeenwidelyadopted.Ithasalreadybeenimplementedinover100co