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,newdataapplicationsareemergingandarer

2、eachingthegeneralpublic.ThroughtheuseofGPRS(GeneralPacketRadioService)technology,theexistingGSMnetworkscanbeeasilyachievedwithsimplehigh-speeddatapacketaccess,enablingmobileoperatorstorespondrapidlytomarketdemandsandgaincompetitiveadvantage.Thispapera

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

4、establishingthefirstsuccessfulradiolinkbetweenaland-basedstationandatugboat.Sincethen,wirelesscommunicationsystemshavebeendevelopingandevolvingwithafuriouspace.Thenumberofmobilesubscribershasbeengrowingtremendouslyinthepastdecades.Intheearlystages,wir

5、elesscommunicationsystemsweredominatedbymilitaryusageandsupportedaccordingtomilitaryneedsandrequirements.Duringthelasthalfacentury,withincreasingcivilapplicationsofmobileservices,commercialwirelesscommunicationsystemshavebeentakingthelead.Theearlywire

6、lesssystemsconsistedofabasestationwithahigh-powertransmitterandservedalargegeographicarea.Eachbasestationcouldserveonlyasmallnumberofusersandwascostlyaswell.ThesystemswereisolatedfromeachotherandonlyafewofthecommunicatedwiththePSTN(PublicSwitchedTelep

7、honeNetworks).Today,thecellularsystemsconsistofaclusterofba-sestationwithlowpowerradiotransmitters.Eachbasestationservesasmallcellwithinalargegeographicarea.Thetotalnumberofusersservedisincreasedbecauseofchannelreuseandal-solargerfrequencybandwidth.Gl

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