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1、附录A外文原文3GTechnology3Gisaglobaldevelopmentofcommunicationstandardsandtechnologies.Thisdevelopmentwillleadtoyourbeingabletoaccessmultimediaserviceswithyourmobilephone.YoumayhaveseentermsinthenewslikeGPRS,EDGE,WCDMA,andUMTS.Alloftheseareconceptsrelatedtodevelopmentofmobilecommunicationn
2、etworksto3G.Althoughthetechnologybehind3Gmayseemcomplicated,thewaysinwhich3Gwillaffectallofourlivesareeasytoimagine.Justimaginehavingacombinedcamera,videocamera,computer,stereo,andradioincludedinyourmobilephone.Rich-mediainformationandentertainmentwillbeatyourfingertipswheneveryouwan
3、tanywherethereisawirelessnetwork.Mobilecommunicationismovingfromsimplevoicetorichmedia,whereweusemoreofoursensestointensifyourexperiences.Butnotallofthiswillhappenatonce.3Gisanevolutiontoacommunicationsidealthatwecannotseetheendofyet.WedoknowthatmobilemultimediawillhittheJapanesemark
4、ets,andEuropeandNorthAmericawillfollowsoonafter.Wealsoknowthat,regardlessofwhetheryoufindnewtechnologiesintimidatingorfascinating,3Gwillbringahostofmobileservicesthatwillbringmoreinformation,moreefficiency,andmorejoytoyourlife.3Gbringstogetherhigh-speedmobileaccessandInternetProtocol
5、(IP)-basedservicesintoonepowerfulenvironment.ThesteptowardsIPisvital.IPispacket-based,whichinsimpleterms,meansuserscanbe‘online’atalltimes,butwith-outhavingtopayuntilweactuallysendorreceivedata.TheconnectionlessnatureofIPalsomakesaccessalotfaster:filedownloadscantakeafewsecondsandwec
6、anbeconnectedtoourcorporatenetworkwithasingleclick.Thisdoesn'tjustmeanfastmobileconnectiontotheWorldWideWebbyliberatingusfromslowconnections,cumbersomeequipmentandimmovableaccesspoints,3Gwillenablenewwaystocommunicate,accessinformation,conductbusinessandlearn.3Gintroduceswidebandradi
7、ocommunications,withaccessspeedsofupto2mbps.Comparedwithtoday’smobilenetworks,3Gwillsignificantlyboostnetworkcapacity–sooperatorswillbeabletosupportmoreusers,aswellasoffermoresophisticatedservices.TheGSMstandardiscontinuallyevolvingtoincorporatenewtechnologies,makingitthemostpopularm
8、obilecommuni
