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1、附录A外文原文3GTechnology3Gisaglobaldevelopmentofcommunicationstandardsandtechnologies.Thisdevelopmentwillleadtoyourbeingabletoaccessmultimediaserviceswithyourmobilephone.YoumayhaveseentermsinthenewslikeGPRS,EDGE,WCDMA,andUMTS.Alloftheseareconceptsrelatedtodevelopmentofmobilecommunicationnetwor
2、ksto3G.Althoughthetechnologybehind3Gmayseemcomplicated,thewaysinwhich3Gwillaffectallofourlivesareeasytoimagine.Justimaginehavingacombinedcamera,videocamera,computer,stereo,andradioincludedinyourmobilephone.Rich-mediainformationandentertainmentwillbeatyourfingertipswheneveryouwantanywheret
3、hereisawirelessnetwork.Mobilecommunicationismovingfromsimplevoicetorichmedia,whereweusemoreofoursensestointensifyourexperiences.Butnotallofthiswillhappenatonce.3Gisanevolutiontoacommunicationsidealthatwecannotseetheendofyet.WedoknowthatmobilemultimediawillhittheJapanesemarkets,andEuropean
4、dNorthAmericawillfollowsoonafter.Wealsoknowthat,regardlessofwhetheryoufindnewtechnologiesintimidatingorfascinating,3Gwillbringahostofmobileservicesthatwillbringmoreinformation,moreefficiency,andmorejoytoyourlife.3Gbringstogetherhigh-speedmobileaccessandInternetProtocol(IP)-basedservicesin
5、toonepowerfulenvironment.ThesteptowardsIPisvital.IPispacket-based,whichinsimpleterms,meansuserscanbe‘online’atalltimes,butwith-outhavingtopayuntilweactuallysendorreceivedata.TheconnectionlessnatureofIPalsomakesaccessalotfaster:filedownloadscantakeafewsecondsandwecanbeconnectedtoourcorpora
6、tenetworkwithasingleclick.Thisdoesn'tjustmeanfastmobileconnectiontotheWorldWideWebbyliberatingusfromslowconnections,cumbersomeequipmentandimmovableaccesspoints,3Gwillenablenewwaystocommunicate,accessinformation,conductbusinessandlearn.3Gintroduceswidebandradiocommunications,withaccessspee
7、dsofupto2mbps.Comparedwithtoday’smobilenetworks,3Gwillsignificantlyboostnetworkcapacity–sooperatorswillbeabletosupportmoreusers,aswellasoffermoresophisticatedservices.TheGSMstandardiscontinuallyevolvingtoincorporatenewtechnologies,makingitthemostpopularmobilecommuni
