电子信息工程专业英语教程（第5版） 课件 Lesson 21 The mobile telephone system (III)

Unit7Audio&SpeechLesson21Themobiletelephonesystem(III)《电子信息工程专业英语教程（第5版）》Lesson21

Third-GenerationMobilePhonesBackgroundsTexttour

LanguageinuseVocabularyStructureReading/writingtechniques2024/5/292《电子信息工程专业英语教程（第5版）》TerminologyHandoff越区切换Videoconferencing视频会议Telepresence

遥现m-commerce移动商务quality-of-service服务质量Videorecorder

录像机Backgrounds2024/5/293《电子信息工程专业英语教程（第5版）》Terminologydirectsequencespreadspectrum直接序列扩频backwardcompatible向下兼容IPpacketIP信息包logicalchannel逻辑通道basestation基站wirelessLAN无线局域网multimedia多媒体softwareradio软件无线电Backgrounds2024/5/294《电子信息工程专业英语教程（第5版）》TerminologyVHS:VideoHomeSystem

家用录像系统SMS:ShortMessageService

短信业务ADSL:AsymmetricalDigitalSubscriberLoop

非对称数字用户环线Backgrounds2024/5/295《电子信息工程专业英语教程（第5版）》TexttourOutlineIMT-2000W-CDMAandCDMA20002.5G（EDGEandGPRS）3G4G2024/5/296《电子信息工程专业英语教程（第5版）》IMT-2000IMT-2000(ITUin1992)IMTstoodforInternationalMobileTelecommunications

Thenumber2000stoodforthreethingstheyearitwassupposedtogointoservicethefrequencyitwassupposedtooperateat(inMHz)thebandwidththeserviceshouldhave(inkHz)2024/5/297《电子信息工程专业英语教程（第5版）》IMT-2000ThebasicservicesthattheIMT-2000networkissupposedtoprovidetoitsusersare:High-qualityvoicetransmission.Messaging(replacinge-mail,fax,SMS,chat,etc.).Multimedia(playingmusic,viewingvideos,films,television,etc.).Internetaccess(Websurfing,includingpageswithaudioandvideo).2024/5/298《电子信息工程专业英语教程（第5版）》W-CDMAandCDMA2000W-CDMA(WidebandCDMA)proposedbyEricsson

(EricssonisbasedinSweden;)usesDSSS(DirectSequenceSpreadSpectrum)runsina5MHzbandwidthdesignedtointer-workwithGSMnetworks,butnotbackwardcompatiblewithGSMEuropeanUnioncalleditUMTS(UniversalMobileTelecommunicationsSystem).2024/5/299《电子信息工程专业英语教程（第5版）》W-CDMAandCDMA2000CDMA2000proposedbyQualcomm(QualcommisinCalifornia).adirectsequencespreadspectrumdesignusesa5-MHzbandwidthanextensionofIS-95andbackwardcompatiblewithitnotbeendesignedtointer-workwithGSM2024/5/2910《电子信息工程专业英语教程（第5版）》EDGEandGPRSEDGE(EnhancedDataratesforGSMEvolution)justGSMwithmorebitsperbaud

GPRS(GeneralPacketRadioService)anoverlaypacketnetworkontopofD-AMPSorGSM.2024/5/2911《电子信息工程专业英语教程（第5版）》3G，4Gand5GAdoptionof3GFeaturesof4GThegoalof5G2024/5/2912《电子信息工程专业英语教程（第5版）》VocabularyDominatereservestationaryenvisioncompatibleoverlaymapmeasureAccessStructurecomedowntocometo

Reading/writingtechniquesLanguageinuse2024/5/2913《电子信息工程专业英语教程（第5版）》Vocabulary2024/5/2914《电子信息工程专业英语教程（第5版）》DominateindictionaryTocontrol,govern,orrulebysuperiorauthorityorpower:

支配Successfulleadersdominateeventsratherthanreacttothem.Toexertasupreme,guidinginfluenceonorover:

施加影响于：Ambitiondominatedtheirlives.2024/5/2915《电子信息工程专业英语教程（第5版）》DominateindictionaryToenjoyacommanding,controllingpositionin:

占支配地位adrugcompanythatdominatesthetranquilizermarket.Tooverlookfromaheight:

俯视aviewfromthecliffsidechaletthatdominatesthevalley.2024/5/2916《电子信息工程专业英语教程（第5版）》DominateintextManyindustryexpertsexpectdatatraffictodominate

voiceonmobiledevicesaswellsoon.许多业界专家预期：在移动设备中，数据传输也将很快赶超话音业务。2024/5/2917《电子信息工程专业英语教程（第5版）》ReserveindictionaryTokeepback,asforfutureuseorforaspecialpurpose.

保留Tosetorcausetobesetapartforaparticularpersonoruse.

存下Tokeeporsecureforoneself;retain

保留；保持

Ireservetherighttodisagree.2024/5/2918《电子信息工程专业英语教程（第5版）》ReserveindictionarySomethingkeptbackorsavedforfutureuseoraspecialpurpose. 储备物Theactofreserving.保留Thekeepingofone'sfeelings,thoughts,oraffairstooneself.自我克制Self-restraintinexpression;reticence慎言；沉默寡言2024/5/2919《电子信息工程专业英语教程（第5版）》ReserveindictionaryLackofenthusiasm;skepticalcaution.矜持，拘谨Anamountofcapitalheldbackfrominvestmentinordertomeetprobableorpossibledemands. 储备金Areservationofpublicland 保留地

aforestreserve.Anamountofamineral,fossilfuel,orotherresourceknowntoexistinaparticularlocationandtobeexploitable矿藏量

thediscoveryoflargeoilreserves.2024/5/2920《电子信息工程专业英语教程（第5版）》ReserveintextITUrecommendedthatallgovernments

reserve

spectrumat2GHzsodevicescouldroamseamlesslyfromcountrytocountry.国际电联建议各国政府预留2GHz附近的频谱，以便设备能够在国与国之间实现无缝漫游。

2024/5/2921《电子信息工程专业英语教程（第5版）》Reserveinuse

actualreserve实际贮量forestreserve保护林naturalreserve自然保护区petroleumreserves石油储量phasereserve相位余量systemreserve系统贮备inreserve备用的withoutreserve无保留地；无条件地2024/5/2922《电子信息工程专业英语教程（第5版）》StationaryindictionaryNotmoving.

静止的Notcapableofbeingmoved;fixed.

不能被移动的；固定的Unchanging:

不变的：astationarysound.2024/5/2923《电子信息工程专业英语教程（第5版）》Stationaryintext

Later,itwasrecognizedthat2Mbpsisnotcurrentlyfeasibleforuserswhoaretoomobile(duetothedifficultyofperforminghandoffsquicklyenough).

Morerealisticis2Mbpsfor

stationary

indoorusers(whichwillcompetehead-onwithADSL),384kbpsforpeoplewalking,and144kbpsforconnectionsincars.后来，人们认识到：对于移动性太强的用户，2Mbps在目前是不现实的（因为很难实现快速的越区切换）。更现实的做法是将2Mbps用于室内用户（这将会和ADSL直接交锋），384kbps给步行用户，144kbps用于汽车内用户。2024/5/2924《电子信息工程专业英语教程（第5版）》Stationaryinuse

Stationarycrane固定式起重机Stationaryengine固定式发动机Stationarywave驻波Stationaryrandomprocess平稳随机过程2024/5/2925《电子信息工程专业英语教程（第5版）》EnvisionindictionaryTopictureinthemind;imagine.

想像2024/5/2926《电子信息工程专业英语教程（第5版）》Envisionintext

ITUenvisionedasingleworldwidetechnologyforIMT-2000,sothatmanufacturerscouldbuildasingledevicethatcouldbesoldandusedanywhereintheworld(likeCDplayersandcomputersandunlikemobilephonesandtelevisions).国际电联设想的IMT-2000是一个单一的全球适用的技术。这样，生产商可以生产世界任何地方均可销售、使用的单一设备（就像CD播放器和计算机一样，而不像现在的移动电话和电视）。2024/5/2927《电子信息工程专业英语教程（第5版）》CompatibleindictionaryCapableofexistingorperforminginharmonious,agreeable,orcongenialcombinationwithanotherorothers:

一致的；可和谐共存的；相容的compatiblefamilyrelationships.Capableoforderly,efficientintegrationandoperationwithotherelementsinasystemwithnomodificationorconversionrequired.

符合的Capableofformingachemicallyorbio-chemicallystablesystem.

稳定的2024/5/2928《电子信息工程专业英语教程（第5版）》CompatibleindictionaryOforrelatingtoatelevisionsysteminwhichcolorbroadcastscanbereceivedinblackandwhitebysetsincapableofcolorreception.

黑白彩色两用的Capableofbeinggrafted,transfused,ortransplantedfromoneindividualtoanotherwithoutrejection:

互不排斥的compatibleblood.Adevice,suchasacomputerorcomputersoftware,thatcanbeintegratedintoorusedwithanotherdeviceorsystemofitstype.2024/5/2929《电子信息工程专业英语教程（第5版）》Compatibleintext

InMarch1999,thetwocompaniessettledthelawsuitswhenEricssonagreedtobuyQualcomm’sinfrastructure.Theyalsoagreedtoasingle3Gstandard,butonewithmultiple

incompatible

options,whichtoalargeextentjustpapersoverthetechnicaldifferences.1999年3月，这两家公司解决了这些诉讼，爱立信公司同意购买高通公司的基础设施。两个公司也达成协议：同意建立单一的3G标准。但这个标准却包含着多个不兼容可选项。在很大程度上，这么做只是为了掩饰二者在技术上的分歧。2024/5/2930《电子信息工程专业英语教程（第5版）》Compatibleinuse

CompatiblecolourTVsystemDrivingacarataspeedcompatiblewithsafetyAccuracyisnotalwayscompatiblewithhaste.Healthandhardworkarecompatible.2024/5/2931《电子信息工程专业英语教程（第5版）》OverlayindictionaryTolayorspreadoveroron.

铺Tocoverthesurfaceofwithadecorativelayerordesign:

覆在…的面上Toembellishsuperficially:

装饰Somethingthatislaidoverorcoverssomethingelse.

覆盖物Alayerofdecoration,suchasgoldleaforwoodveneer,appliedtoasurface.

饰面2024/5/2932《电子信息工程专业英语教程（第5版）》OverlayindictionaryInacomputerprogram,asegmentthatisnotpermanentlymaintainedininternalstorage.Thetechniqueofrepeatedlyusingthesameareasofinternalstorageduringdifferentstagesofaprogram.Inadocumentcopyingmachine,adeviceforaddingtoormaskingdetailsfromanoriginalsothattheseareincorporatedintoordeletedfromthecopies.Intheexecutionofacomputerprogram,toloadasegmentofthecomputerprograminastorageareahithertooccupiedbypartsofthecomputerprogramthatarenotcurrentlyneeded.2024/5/2933《电子信息工程专业英语教程（第5版）》Overlayintext

Another2.5GschemeisGPRS(GeneralPacketRadioService),whichisan

overlaypacketnetworkontopofD-AMPSorGSM.ItallowsmobilestationstosendandreceiveIPpacketsinacellrunningavoicesystem.还有一个2.5G的机制是GPRS（通用分组无线业务）。GPRS是在D-AMPS或GSM之上建立的重叠分组网络。GPRS允许移动站在运行语音系统的小区中发送、接收IP分组。2024/5/2934《电子信息工程专业英语教程（第5版）》MapindictionaryArepresentation,usuallyonaplanesurface,ofaregionoftheearthorheavens.

地图，天体图Somethingthatsuggestssucharepresentation,asinclarityofrepresentation.

类似地图的事物Thecorrespondenceofoneormoreelementsinonesettooneormoreelementsinthesamesetoranotherset.

对应关系2024/5/2935《电子信息工程专业英语教程（第5版）》MapindictionaryTomakeamapof；Todepictasifonamap给…绘图Griefwasmappedonhisface.Toexploreormakeasurveyof(aregion)forthepurposeofmakingamap.

勘查Toplanordelineate,especiallyindetail;arrange:

详细规划；安排：mappingoutherfuture.Toestablishamappingof(anelementoraset).

建立映射2024/5/2936《电子信息工程专业英语教程（第5版）》MapintextTheavailabletimeslotsaredividedintoseverallogicalchannels,usedfordifferentpurposes.Thebasestationdetermineswhichlogicalchannelsare

mappedontowhichtimeslots.Onelogicalchannelisfordownloadingpacketsfromthebasestationtosomemobilestation,witheachpacketindicatingwhoitisdestinedfor.

可用时隙几个不同用途的逻辑信道。基站决定哪个逻辑信道映射到哪个时隙。一个逻辑信道用于将分组从基站下载到某个移动站，而每个分组都指明了自己要去谁那里。2024/5/2937《电子信息工程专业英语教程（第5版）》Mapinuse

addressmap地址变换bird'seyeviewmap鸟瞰图electronicmap电子地图fieldstrengthcontourmap等场强线地图internationalmapofworldonmillionscale国际百万分之一世界地图2024/5/2938《电子信息工程专业英语教程（第5版）》Mapinuse

memorymap存储分配图表radiomap射电天图resourcemap资源分布图2024/5/2939《电子信息工程专业英语教程（第5版）》MeasureindictionaryDimensions,quantity,orcapacityasascertainedbycomparisonwithastandard.度量Areferencestandardorsampleusedforthequantitativecomparisonofproperties测量标准Thestandardkilogramismaintainedasameasureofmass.Aunitspecifiedbyascale,suchasaninch,orbyvariableconditions,suchasaday'smarch.测量单位Asystemofmeasurement,suchasthemetricsystem.计量制Adeviceusedformeasuring.计量仪器Theactofmeasuring.测量2024/5/2940《电子信息工程专业英语教程（第5版）》MeasureindictionaryAnevaluationorabasisofcomparison 标准，尺度ThefinalmeasureoftheworthofasocietyExtentordegree范围，程度Theproblemwasinlargemeasurecausedbyhiscarelessness.Adefinitequantitythathasbeenmeasuredout一定量ameasureofwineAfittingamount适度ameasureofrecognition.Alimitedamountordegree限度；分寸ameasureofgood-willLimit;bounds限度；界限generosityknowingnomeasure.Appropriaterestraint;moderation适度节制；缓和Anactiontakenasameanstoanend;anexpedient手段，策略desperatemeasures2024/5/2941《电子信息工程专业英语教程（第5版）》MeasureindictionaryToascertainthedimensions,quantity,orcapacityof测量measuredtheheightoftheceiling.Tomark,layout,orestablishdimensionsforbymeasuring标出measureoffanareaToestimatebyevaluationorcomparison估量，衡量Tobringintocomparison比较，较量Shemeasuredherpowerwiththatofadangerousadversary.Toallotordistributeasifbymeasuring;mete分配Toconsiderorchoosewithcare;weigh权衡，衡量，斟酌Hemeasureshiswordswithcaution.2024/5/2942《电子信息工程专业英语教程（第5版）》MeasureintextSinceGPRSisjustanoverlayovertheexistingvoicesystem,itisatbestastop-gapmeasureuntil3Garrives.因为GPRS仅仅是在已有语音系统之上的覆盖，所以它最多是3G到来前的一种权宜之策。2024/5/2943《电子信息工程专业英语教程（第5版）》Measureinuse

counterradarmeasures反雷达措施cubicmeasure体积,容量emergencymeasure紧急措施halfmeasures折衷办法2024/5/2944《电子信息工程专业英语教程（第5版）》Measureinuse

pricemeasure价格尺度Shannon-Wienermeasure香农-维纳测度