電子信息工程專業(yè)英語教程（第5版） 課件 Lesson 21 The mobile telephone system (III)

Unit7Audio&SpeechLesson21Themobiletelephonesystem(III)《電子信息工程專業(yè)英語教程（第5版）》Lesson21

Third-GenerationMobilePhonesBackgroundsTexttour

LanguageinuseVocabularyStructureReading/writingtechniques2024/5/292《電子信息工程專業(yè)英語教程（第5版）》TerminologyHandoff越區(qū)切換Videoconferencing視頻會(huì)議Telepresence

遙現(xiàn)m-commerce移動(dòng)商務(wù)quality-of-service服務(wù)質(zhì)量Videorecorder

錄像機(jī)Backgrounds2024/5/293《電子信息工程專業(yè)英語教程（第5版）》Terminologydirectsequencespreadspectrum直接序列擴(kuò)頻backwardcompatible向下兼容IPpacketIP信息包logicalchannel邏輯通道basestation基站wirelessLAN無線局域網(wǎng)multimedia多媒體softwareradio軟件無線電Backgrounds2024/5/294《電子信息工程專業(yè)英語教程（第5版）》TerminologyVHS:VideoHomeSystem

家用錄像系統(tǒng)SMS:ShortMessageService

短信業(yè)務(wù)ADSL:AsymmetricalDigitalSubscriberLoop

非對(duì)稱數(shù)字用戶環(huán)線Backgrounds2024/5/295《電子信息工程專業(yè)英語教程（第5版）》TexttourOutlineIMT-2000W-CDMAandCDMA20002.5G（EDGEandGPRS）3G4G2024/5/296《電子信息工程專業(yè)英語教程（第5版）》IMT-2000IMT-2000(ITUin1992)IMTstoodforInternationalMobileTelecommunications

Thenumber2000stoodforthreethingstheyearitwassupposedtogointoservicethefrequencyitwassupposedtooperateat(inMHz)thebandwidththeserviceshouldhave(inkHz)2024/5/297《電子信息工程專業(yè)英語教程（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《電子信息工程專業(yè)英語教程（第5版）》W-CDMAandCDMA2000W-CDMA(WidebandCDMA)proposedbyEricsson

(EricssonisbasedinSweden;)usesDSSS(DirectSequenceSpreadSpectrum)runsina5MHzbandwidthdesignedtointer-workwithGSMnetworks,butnotbackwardcompatiblewithGSMEuropeanUnioncalleditUMTS(UniversalMobileTelecommunicationsSystem).2024/5/299《電子信息工程專業(yè)英語教程（第5版）》W-CDMAandCDMA2000CDMA2000proposedbyQualcomm(QualcommisinCalifornia).adirectsequencespreadspectrumdesignusesa5-MHzbandwidthanextensionofIS-95andbackwardcompatiblewithitnotbeendesignedtointer-workwithGSM2024/5/2910《電子信息工程專業(yè)英語教程（第5版）》EDGEandGPRSEDGE(EnhancedDataratesforGSMEvolution)justGSMwithmorebitsperbaud

GPRS(GeneralPacketRadioService)anoverlaypacketnetworkontopofD-AMPSorGSM.2024/5/2911《電子信息工程專業(yè)英語教程（第5版）》3G，4Gand5GAdoptionof3GFeaturesof4GThegoalof5G2024/5/2912《電子信息工程專業(yè)英語教程（第5版）》VocabularyDominatereservestationaryenvisioncompatibleoverlaymapmeasureAccessStructurecomedowntocometo

Reading/writingtechniquesLanguageinuse2024/5/2913《電子信息工程專業(yè)英語教程（第5版）》Vocabulary2024/5/2914《電子信息工程專業(yè)英語教程（第5版）》DominateindictionaryTocontrol,govern,orrulebysuperiorauthorityorpower:

支配Successfulleadersdominateeventsratherthanreacttothem.Toexertasupreme,guidinginfluenceonorover:

施加影響于：Ambitiondominatedtheirlives.2024/5/2915《電子信息工程專業(yè)英語教程（第5版）》DominateindictionaryToenjoyacommanding,controllingpositionin:

占支配地位adrugcompanythatdominatesthetranquilizermarket.Tooverlookfromaheight:

俯視aviewfromthecliffsidechaletthatdominatesthevalley.2024/5/2916《電子信息工程專業(yè)英語教程（第5版）》DominateintextManyindustryexpertsexpectdatatraffictodominate

voiceonmobiledevicesaswellsoon.許多業(yè)界專家預(yù)期：在移動(dòng)設(shè)備中，數(shù)據(jù)傳輸也將很快趕超話音業(yè)務(wù)。2024/5/2917《電子信息工程專業(yè)英語教程（第5版）》ReserveindictionaryTokeepback,asforfutureuseorforaspecialpurpose.

保留Tosetorcausetobesetapartforaparticularpersonoruse.

存下Tokeeporsecureforoneself;retain

保留；保持

Ireservetherighttodisagree.2024/5/2918《電子信息工程專業(yè)英語教程（第5版）》ReserveindictionarySomethingkeptbackorsavedforfutureuseoraspecialpurpose. 儲(chǔ)備物Theactofreserving.保留Thekeepingofone'sfeelings,thoughts,oraffairstooneself.自我克制Self-restraintinexpression;reticence慎言；沉默寡言2024/5/2919《電子信息工程專業(yè)英語教程（第5版）》ReserveindictionaryLackofenthusiasm;skepticalcaution.矜持，拘謹(jǐn)Anamountofcapitalheldbackfrominvestmentinordertomeetprobableorpossibledemands. 儲(chǔ)備金Areservationofpublicland 保留地

aforestreserve.Anamountofamineral,fossilfuel,orotherresourceknowntoexistinaparticularlocationandtobeexploitable礦藏量

thediscoveryoflargeoilreserves.2024/5/2920《電子信息工程專業(yè)英語教程（第5版）》ReserveintextITUrecommendedthatallgovernments

reserve

spectrumat2GHzsodevicescouldroamseamlesslyfromcountrytocountry.國(guó)際電聯(lián)建議各國(guó)政府預(yù)留2GHz附近的頻譜，以便設(shè)備能夠在國(guó)與國(guó)之間實(shí)現(xiàn)無縫漫游。

2024/5/2921《電子信息工程專業(yè)英語教程（第5版）》Reserveinuse

actualreserve實(shí)際貯量forestreserve保護(hù)林naturalreserve自然保護(hù)區(qū)petroleumreserves石油儲(chǔ)量phasereserve相位余量systemreserve系統(tǒng)貯備inreserve備用的withoutreserve無保留地；無條件地2024/5/2922《電子信息工程專業(yè)英語教程（第5版）》StationaryindictionaryNotmoving.

靜止的Notcapableofbeingmoved;fixed.

不能被移動(dòng)的；固定的Unchanging:

不變的：astationarysound.2024/5/2923《電子信息工程專業(yè)英語教程（第5版）》Stationaryintext

Later,itwasrecognizedthat2Mbpsisnotcurrentlyfeasibleforuserswhoaretoomobile(duetothedifficultyofperforminghandoffsquicklyenough).

Morerealisticis2Mbpsfor

stationary

indoorusers(whichwillcompetehead-onwithADSL),384kbpsforpeoplewalking,and144kbpsforconnectionsincars.后來，人們認(rèn)識(shí)到：對(duì)于移動(dòng)性太強(qiáng)的用戶，2Mbps在目前是不現(xiàn)實(shí)的（因?yàn)楹茈y實(shí)現(xiàn)快速的越區(qū)切換）。更現(xiàn)實(shí)的做法是將2Mbps用于室內(nèi)用戶（這將會(huì)和ADSL直接交鋒），384kbps給步行用戶，144kbps用于汽車內(nèi)用戶。2024/5/2924《電子信息工程專業(yè)英語教程（第5版）》Stationaryinuse

Stationarycrane固定式起重機(jī)Stationaryengine固定式發(fā)動(dòng)機(jī)Stationarywave駐波Stationaryrandomprocess平穩(wěn)隨機(jī)過程2024/5/2925《電子信息工程專業(yè)英語教程（第5版）》EnvisionindictionaryTopictureinthemind;imagine.

想像2024/5/2926《電子信息工程專業(yè)英語教程（第5版）》Envisionintext

ITUenvisionedasingleworldwidetechnologyforIMT-2000,sothatmanufacturerscouldbuildasingledevicethatcouldbesoldandusedanywhereintheworld(likeCDplayersandcomputersandunlikemobilephonesandtelevisions).國(guó)際電聯(lián)設(shè)想的IMT-2000是一個(gè)單一的全球適用的技術(shù)。這樣，生產(chǎn)商可以生產(chǎn)世界任何地方均可銷售、使用的單一設(shè)備（就像CD播放器和計(jì)算機(jī)一樣，而不像現(xiàn)在的移動(dòng)電話和電視）。2024/5/2927《電子信息工程專業(yè)英語教程（第5版）》CompatibleindictionaryCapableofexistingorperforminginharmonious,agreeable,orcongenialcombinationwithanotherorothers:

一致的；可和諧共存的；相容的compatiblefamilyrelationships.Capableoforderly,efficientintegrationandoperationwithotherelementsinasystemwithnomodificationorconversionrequired.

符合的Capableofformingachemicallyorbio-chemicallystablesystem.

穩(wěn)定的2024/5/2928《電子信息工程專業(yè)英語教程（第5版）》CompatibleindictionaryOforrelatingtoatelevisionsysteminwhichcolorbroadcastscanbereceivedinblackandwhitebysetsincapableofcolorreception.

黑白彩色兩用的Capableofbeinggrafted,transfused,ortransplantedfromoneindividualtoanotherwithoutrejection:

互不排斥的compatibleblood.Adevice,suchasacomputerorcomputersoftware,thatcanbeintegratedintoorusedwithanotherdeviceorsystemofitstype.2024/5/2929《電子信息工程專業(yè)英語教程（第5版）》Compatibleintext

InMarch1999,thetwocompaniessettledthelawsuitswhenEricssonagreedtobuyQualcomm’sinfrastructure.Theyalsoagreedtoasingle3Gstandard,butonewithmultiple

incompatible

options,whichtoalargeextentjustpapersoverthetechnicaldifferences.1999年3月，這兩家公司解決了這些訴訟，愛立信公司同意購(gòu)買高通公司的基礎(chǔ)設(shè)施。兩個(gè)公司也達(dá)成協(xié)議：同意建立單一的3G標(biāo)準(zhǔn)。但這個(gè)標(biāo)準(zhǔn)卻包含著多個(gè)不兼容可選項(xiàng)。在很大程度上，這么做只是為了掩飾二者在技術(shù)上的分歧。2024/5/2930《電子信息工程專業(yè)英語教程（第5版）》Compatibleinuse

CompatiblecolourTVsystemDrivingacarataspeedcompatiblewithsafetyAccuracyisnotalwayscompatiblewithhaste.Healthandhardworkarecompatible.2024/5/2931《電子信息工程專業(yè)英語教程（第5版）》OverlayindictionaryTolayorspreadoveroron.

鋪Tocoverthesurfaceofwithadecorativelayerordesign:

覆在…的面上Toembellishsuperficially:

裝飾Somethingthatislaidoverorcoverssomethingelse.

覆蓋物Alayerofdecoration,suchasgoldleaforwoodveneer,appliedtoasurface.

飾面2024/5/2932《電子信息工程專業(yè)英語教程（第5版）》OverlayindictionaryInacomputerprogram,asegmentthatisnotpermanentlymaintainedininternalstorage.Thetechniqueofrepeatedlyusingthesameareasofinternalstorageduringdifferentstagesofaprogram.Inadocumentcopyingmachine,adeviceforaddingtoormaskingdetailsfromanoriginalsothattheseareincorporatedintoordeletedfromthecopies.Intheexecutionofacomputerprogram,toloadasegmentofthecomputerprograminastorageareahithertooccupiedbypartsofthecomputerprogramthatarenotcurrentlyneeded.2024/5/2933《電子信息工程專業(yè)英語教程（第5版）》Overlayintext

Another2.5GschemeisGPRS(GeneralPacketRadioService),whichisan

overlaypacketnetworkontopofD-AMPSorGSM.ItallowsmobilestationstosendandreceiveIPpacketsinacellrunningavoicesystem.還有一個(gè)2.5G的機(jī)制是GPRS（通用分組無線業(yè)務(wù)）。GPRS是在D-AMPS或GSM之上建立的重疊分組網(wǎng)絡(luò)。GPRS允許移動(dòng)站在運(yùn)行語音系統(tǒng)的小區(qū)中發(fā)送、接收IP分組。2024/5/2934《電子信息工程專業(yè)英語教程（第5版）》MapindictionaryArepresentation,usuallyonaplanesurface,ofaregionoftheearthorheavens.

地圖，天體圖Somethingthatsuggestssucharepresentation,asinclarityofrepresentation.

類似地圖的事物Thecorrespondenceofoneormoreelementsinonesettooneormoreelementsinthesamesetoranotherset.

對(duì)應(yīng)關(guān)系2024/5/2935《電子信息工程專業(yè)英語教程（第5版）》MapindictionaryTomakeamapof；Todepictasifonamap給…繪圖Griefwasmappedonhisface.Toexploreormakeasurveyof(aregion)forthepurposeofmakingamap.

勘查Toplanordelineate,especiallyindetail;arrange:

詳細(xì)規(guī)劃；安排：mappingoutherfuture.Toestablishamappingof(anelementoraset).

建立映射2024/5/2936《電子信息工程專業(yè)英語教程（第5版）》MapintextTheavailabletimeslotsaredividedintoseverallogicalchannels,usedfordifferentpurposes.Thebasestationdetermineswhichlogicalchannelsare

mappedontowhichtimeslots.Onelogicalchannelisfordownloadingpacketsfromthebasestationtosomemobilestation,witheachpacketindicatingwhoitisdestinedfor.

可用時(shí)隙幾個(gè)不同用途的邏輯信道?；緵Q定哪個(gè)邏輯信道映射到哪個(gè)時(shí)隙。一個(gè)邏輯信道用于將分組從基站下載到某個(gè)移動(dòng)站，而每個(gè)分組都指明了自己要去誰那里。2024/5/2937《電子信息工程專業(yè)英語教程（第5版）》Mapinuse

addressmap地址變換bird'seyeviewmap鳥瞰圖electronicmap電子地圖fieldstrengthcontourmap等場(chǎng)強(qiáng)線地圖internationalmapofworldonmillionscale國(guó)際百萬分之一世界地圖2024/5/2938《電子信息工程專業(yè)英語教程（第5版）》Mapinuse

memorymap存儲(chǔ)分配圖表radiomap射電天圖resourcemap資源分布圖2024/5/2939《電子信息工程專業(yè)英語教程（第5版）》MeasureindictionaryDimensions,quantity,orcapacityasascertainedbycomparisonwithastandard.度量Areferencestandardorsampleusedforthequantitativecomparisonofproperties測(cè)量標(biāo)準(zhǔn)Thestandardkilogramismaintainedasameasureofmass.Aunitspecifiedbyascale,suchasaninch,orbyvariableconditions,suchasaday'smarch.測(cè)量單位Asystemofmeasurement,suchasthemetricsystem.計(jì)量制Adeviceusedformeasuring.計(jì)量?jī)x器Theactofmeasuring.測(cè)量2024/5/2940《電子信息工程專業(yè)英語教程（第5版）》MeasureindictionaryAnevaluationorabasisofcomparison 標(biāo)準(zhǔn)，尺度ThefinalmeasureoftheworthofasocietyExtentordegree范圍，程度Theproblemwasinlargemeasurecausedbyhiscarelessness.Adefinitequantitythathasbeenmeasuredout一定量ameasureofwineAfittingamount適度ameasureofrecognition.Alimitedamountordegree限度；分寸ameasureofgood-willLimit;bounds限度；界限generosityknowingnomeasure.Appropriaterestraint;moderation適度節(jié)制；緩和Anactiontakenasameanstoanend;anexpedient手段，策略desperatemeasures2024/5/2941《電子信息工程專業(yè)英語教程（第5版）》MeasureindictionaryToascertainthedimensions,quantity,orcapacityof測(cè)量measuredtheheightoftheceiling.Tomark,layout,orestablishdimensionsforbymeasuring標(biāo)出measureoffanareaToestimatebyevaluationorcomparison估量，衡量Tobringintocomparison比較，較量Shemeasuredherpowerwiththatofadangerousadversary.Toallotordistributeasifbymeasuring;mete分配Toconsiderorchoosewithcare;weigh權(quán)衡，衡量，斟酌Hemeasureshiswordswithcaution.2024/5/2942《電子信息工程專業(yè)英語教程（第5版）》MeasureintextSinceGPRSisjustanoverlayovertheexistingvoicesystem,itisatbestastop-gapmeasureuntil3Garrives.因?yàn)镚PRS僅僅是在已有語音系統(tǒng)之上的覆蓋，所以它最多是3G到來前的一種權(quán)宜之策。2024/5/2943《電子信息工程專業(yè)英語教程（第5版）》Measureinuse

counterradarmeasures反雷達(dá)措施cubicmeasure體積,容量emergencymeasure緊急措施halfmeasures折衷辦法2024/5/2944《電子信息工程專業(yè)英語教程（第5版）》Measureinuse

pricemeasure價(jià)格尺度Shannon-Wienermeasure香農(nóng)-維納測(cè)度