3G网络优化难点及解决方案译文

译文西安邮电学院毕业设计（译文）论文题目：3G网络优化难点及其解决方案研究院（系）：通信与信息工程学院专业：通信工程班级：通工0609班学生姓名：李保俊导师姓名：于友成职称：高级工程师英文原文3GTECHNOLOGYAlthoughthetechnologybehind3Gmayseemcomplicated,thewaysinwhich3Gwillaffectallofourlivesareeasytoimagine.Justimaginehavingacombinedcamera,videocamera,computer,stereo,andradioincludedinyourmobilephone.Rich-media:Linformationandentertainmentwillbeatyourfingertipswheneveryouwantanywherethereisawirelessnetwork.Mobilecommunicationismovingfromsimplevoicetorichmedia,whereweusemoreofoursensestointensifourexperiences.Butnotallofthiswillhappenatonce.3Gisanevolutiontoacommunicationsideathatnoonecompletelyunderstandsyet.WhatwedoknowisthatmobilemultimediawillhittheJapanesemarketsin2001,andEuropeandNorthAmericawillf0llowsoonafter3Gbringstogetherhigh-speedradioaccessandIP-basedservicesintoone,power.1environment.ThesteptowardsIPisvital.IPispacket-based,whichinsimpleterms,meansuserscanbeonlineatalltimes,butwithouthavingtopayuntilweactuallysendorreceivedata.TheconnectionlessnatureofIPalsomakesaccessalotfaster:filedownloadscantakeafewsecondsandwecanbeconnectedtoourcorporatenetworkwithasingleclick.3Gintroduceswidebandradiocommunications,withaccessspeedsofupto2Mbit/s..Comparedwithtoday'smobilenetworks,3Gwillsignificantlyboostnetworkcapacity-sooperatorswillbeabletosupportmoreusers,aswellasoffermoresophisticatedServices.3GAthome3Gisgoingtoaffectourhomeandsociallivesinmanyways.Theservicesthat3GenableswillhelpustomanageourpersonaIinformation,simplifytaskssuchasgroceryshopping,makebetteruseofourtimeandofferservicesthatarejustfuntouse.Operatorswillbeabletodevelopmyriadnewserviceopportunitiestoattractandretainnewcustomers.Herearesomeexamples:You'resittingonatrainandusethisdeadtimetologontoyourbankaccount,checkyourbalanceandpayafewbills-allthroughyour3Gdevice.Yousavetimeandcanbesmarteraboutmanagingyourf1nances.Onatouringvacation,youarriveinanewcity.Youhaven'tmadeanyreservationsinadvance,becauseyoucandothiswhenyougetthere,byusingyour3Ghandsettoobtainup-to-dateinformation,includinghotelvacancies.Havingbookedaroom,youcanuseyourmobiletoviewvideoclipsoflocaltouristattractionsandtalktosomeonefromthelocaltouristinformationatthesametime3GAtwork3Gwillnotjustsupporttheneedsofbusinesspeoplewhotravelalot,butwillalsohelpnew,flexibleworkingpractices,suchashome-workingandremoteaccesstocorporatenetworksoutsidetraditionalworkinghours.Businesspeopleareoftenhigh-volumeairtimeusers,sotheyrepresentabigopportunityformobileoperators.Herearesomeexamples:Atworkyoureceiveamessagefromyoursmartrefrigeratorathome.Themessagetellsyoutl7atcertainitemsneedrestockingandanorderhasalreadybeenpreparedforthelocalgrocerystore,whichyoucanapprove,sothatyourgroceriesarereadytocollectonthewayhome.Youareontheroad,andurgentlyneedtodiscussadraftpresentationwithanumberofcolleaguesbackintheoffice.Pullingintoaservicestation,youuseyour3Gdevicetoholdatelemeetingwithyourcolleaguesand,atthesametime,youcanallviewthedraftpresentationandmakechangesonline.Amaintenanceengineerisrepairingsomeequipmentonaclient'spremisesandhitsaproblem.Usinghis3Gdevice,hecontactsI)isdepartmentanddownloadsademonstrationvideotl7atguideshimthroughtherepairprocess.TECHNOLOGY3Gbringstogethertwopowerfulforces:widebandradiocommunicationsandIP-basedservices.Together,theselaythegroundworkforadvancedMobileInternetservices,includingpersonalizedportals,infotainment,mobilecommerceandunifiedmessaging-encompassinghigh-speeddata,superiorqualityvoiceandvideoandlocation-basedservices.Making3Garealitydependsontechnologydevelopmentsindifferentareas.Theseincludeamendmentstodieradiointerfacetosupportwidebandcommunicationsandinthecorenetwork.Supportingtechnologies,suchasWAPandBluetooth,alsohaveanimportantroletoplay.Thissectionprovidesabriefoverviewofsomeofthemaintechnologiesanddevelopmentsinvolved.Ericssonsupportsallofthesetechnologiesandhasplayedanactiveroleintheirdevelopment.GPRSGeneralPacketRadioService(GPRS)isanenhancementtoexistingGSMandTDMAnetworksthatintroducespacketdatatransmission,enablingalwaysonmobility.Thismeansthatuserscanchoosetobepermanentlyloggedontoe-mail,Internetaccessandotherservices,butdonothavetopayfortheseservicesunlesssendingorreceivinginformation.WhenEDGEisaddedtoGPRS,thesedatarateswillincreaseupto384kbit/S.GPRSwillbeimplementedbyaddingnewpacketdatanodesandupgradingexistingnodestoprovidearoutingpathforpacketdatabetweenthemobileterminalandagatewaynode.ThegatewaynodewillprovideinterworkingwithexternalpacketdatanetworksforaccesstotheInternetandintranets.Benef1tsFasterdataspeedsandalwaysonmobilityAlmostinstantaneousconnectionset-upConnectiontoanabundanceofdatasourcesaroundtheworld,throughsupportformultiplcprotocols,includingIPAsteptowardsfull3Gservices.。WCDMAWidebandCodeDivisionMultipleAccess(WCDMA)isa\ridebandradiotecl7niquethatprovidesfarhigherdataratesthanotherradiotechniquesavailabletoday,upto2Mbit/s,andhighlyefficientuseofradiospectrum.Thehigherb8indwidththatWCDMAprovides\11delivertheRillpotentialof3G.Forexample,WCDMAallowssimultaneousaccesstoseveralvoice,videoanddataservicesatonce.WCDMAisfullycompliant