理论研究通用分组无线业务-外文翻译

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1、TheoreticalStudyoftheGeneralPacketRadioServiceAbstract:Ascommunicationstechnologycontinuestomaturea-ndusers’qualityhavebecomeincreasinglydemanding,newda-taapplicationsareemergingandarereachingthegeneralpublic.ThroughtheuseofGPRS(GeneralPacketRadioSer

2、vice)techn-ology,theexistingGSMnetworkscanbeeasilyachievedwithsimplehigh-speeddatapacketaccess,enablingmobileoperatorstorespondrapidlytomarket段落为1.5行距，标尺幅面44demandsandgaincompetitiveadva-ntage.Thispaperaimstoprovideacomprehensiveyetsimpleoverviewofth

3、eGPRSsystemfromtheuser’sandfromthearch-itecturalperspectives.Keywords:GPRSnetworks;Voice/dataintegration;Multiple-channels;Packetradio;Telecommunications1IntroductionInthelate1800s,Marconididthepioneerworkestablishingthefirstsuccessfulradiolinkbetwee

4、naland-basedstationandatugboat.Sincethen,wirelesscommunicationsystemshavebeendevelopingandevolvingwithafuriouspace.Thenumberofmobilesubscribershasbeengrowingtremendouslyinthepastdecades.Intheearlystages,wirelesscommunicationsystemsweredominatedbymili

5、taryusageandsupportedaccordingtomilitaryneedsandrequirements.Duringthelasthalfacentury,withincreasingcivilapplicationsofmobileservices,commercialwirelesscommunicationsystemshavebeentakingthelead.Theearlywirelesssystemsconsistedofabasestationwithahigh

6、-powertransmitterandservedalargegeographicarea.Eachbasestationcouldserveonlyasmallnumberofusersandwascostlyaswell.ThesystemswereisolatedfromeachotherandonlyafewofthecommunicatedwiththePSTNs(PublicSwitchedTelephoneNetworks).Today,thecellularsystemscon

7、sistofaclusterofba-sestationwithlowpowerradiotransmitters.Eachbasestations-ervesasmallcellwithinalargegeographicarea.Thetotalnum-berofusersservedisincreasedbecauseofchannelreuseandal-solargerfrequencybandwidth.Globalsystemformobilecommunicationsisthe

8、EuropeanstandardforcellularcommunicationsdevelopedbytheETSI(EuropeanTelecommunicationsStandardsInstitute).ThroughoutEuropeandtherestoftheworld,GSMhasbeenwidelyadopted.Ithasalreadybeenimplementedinover100countries.ThemostimportantserviceinGSMisvoicete