gprs外文翻译--理论研究通用分组无线业务

《gprs外文翻译--理论研究通用分组无线业务》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

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,newdataapplicationsareemergingandarereachingthegeneralpublic.Throught

2、heuseofGPRS(GeneralPacketRadioService)technology,theexistingGSMnetworkscanbeeasilyachievedwithsimplehigh-speeddatapacketaccess,enablingmobileoperatorstorespondrapidlytomarketdemandsandgaincompetitiveadvantage.ThispaperaimstoprovideacomprehensiveyetsimpleoverviewoftheGPRSsystemfromth

3、euser’sandfromthearchitecturalperspectives.Keywords:GPRSnetworks;Voice/dataintegration;Multiple-channels;Packetradio;Telecommunications1IntroductionInthelate1800s,Marconididthepioneerworkestablishingthefirstsuccessfulradiolinkbetweenaland-basedstationandatugboat.Sincethen,wirelessco

4、mmunicationsystemshavebeendevelopingandevolvingwithafuriouspace.Thenumberofmobilesubscribershasbeengrowingtremendouslyinthepastdecades.Intheearlystages,wirelesscommunicationsystemsweredominatedbymilitaryusageandsupportedaccordingtomilitaryneedsandrequirements.Duringthelasthalfacentu

5、ry,withincreasingcivilapplicationsofmobileservices,commercialwirelesscommunicationsystemshavebeentakingthelead.Theearlywirelesssystemsconsistedofabasestationwithahigh-powertransmitterandservedalargegeographicarea.Eachbasestationcouldserveonlyasmallnumberofusersandwascostlyaswell.The

6、systemswereisolatedfromeachotherandonlyafewofthecommunicatedwiththePSTN(PublicSwitchedTelephoneNetworks).Today,thecellularsystemsconsistofaclusterofba-sestationwithlowpowerradiotransmitters.Eachbasestationservesasmallcellwithinalargegeographicarea.Thetotalnumberofusersservedisincrea

7、sedbecauseofchannelreuseandal-solargerfrequencybandwidth.GlobalsystemformobilecommunicationsistheEuropeanstandardforcellularcommunicationsdevelopedbytheETSI(EuropeanTelecommunicationsStandardsInstitute).ThroughoutEuropeandtherestoftheworld,GSMhasbeenwidelyadopted.Ithasalreadybeenimp

8、lementedinover100co