教学材料《计算机》-2-3 Mobile Communication

2-3MobileCommunicationWiththedevelopmentofscienceandtechnology,communicationtechnologyhasbeenimprovedrapidlyandtheheterogeneousofmobilecommunicationsystemhasbeenseen.Thetrendoffuturemobilecommunicationistorealizethecombinationofthemobilecommunicationnetworks,inordertoservetheusersbetter.随着科技的进步，通信技术得到了飞速的发展，移动通信系统的异构性更加充分。未来移动通信发展的趋势是实现移动通信网络的融合，更好地为用户服务。Keywords:user[ˈju:zə(r)]n.用户；用户的；使用者；户名2-3MobileCommunicationThereisoneortwopeoplemovinginthecommunication,whichiscalledmobilecommunication.Itincludesland,seaandairmobilecommunications.Recallingthedevelopmentofmobilecommunications,wecanknowithasexperiencedfourstages.通信双方有一方或两方处于运动中的通信称为移动通信。包括陆、海、空移动通信。回顾移动通信的发展历程，移动通信的发展大致经历了四个阶段。Keywords:stage[steɪdʒ]n.阶段；舞台2-3MobileCommunicationThefirstgenerationofmobilecommunicationtechnologyiscalled1G.Onlythevoice

trafficcanbetransmittedbythetechnologyandithasthenetworkcapacityconstraint.1G表示第一代移动通信技术。1G无线系统在设计上只能传输语音流量，并受到网络容量的限制。Keywords:generation[ˌdʒenəˈreɪʃn]n.一代；代voice[vɔɪs]n.声音、语音traffic[ˈtræfɪk]n.流量，交通transmit[trænsˈmɪt]vt.传送，传播，传输2-3MobileCommunicationThesecondgenerationmobilecommunicationtechnologyiscalled2Gwithdigitalvoicetransmissiontechnologyasthecore.Generallyitcannotbeusedtotransmittheinformationjustase-mailandsoftwaredirectly.Insteadwecancalleachotherandtransmittheinformationsuchastimeanddate.2G表示第二代手机通信技术，以数字语音传输技术为核心。一般定义为无法直接传送如电子邮件、软件等信息；只可以用来通话和一些如时间、日期等信息。Keywords:information[ˌɪnfəˈmeɪʃn]n.信息2-3MobileCommunication3Gisthethirdgenerationmobilecommunicationtechnology.Theinformationbothvoiceanddatacanbetransmittedby3G.3GisanewcombinationofwirelesscommunicationsystemwithwirelessandInternetmultimediacommunication.3G是第三代移动通信技术。3G服务能够同时传送声音及数据信息。3G是指将无线通信与国际互联网等多媒体通信结合的新一代移动通信系统。Keywords:combination[ˌkɒmbɪˈneɪʃn]n.组合；结合wireless[ˈwaɪələs]adj.无线的2-3MobileCommunication4Gisthefourthgenerationmobilecommunicationtechnology.Atpresentthistechnologyhasnotbeenacceptedbythewirelesscommunicationstandardnextgenerationactually.Thereforewecanjustcallit3.9G.4Gisthecombinationof3GandWLANanditcanbeusedtotransmitthedata,audio,videoandimagerapidly.4G指的是第四代移动通信技术。目前该技术其实并未被下一代无线通讯标准所认可，因此在严格意义上只是3.9G。4G是集3G与WLAN于一体，并能够快速传输数据、音频、视频和图像等的一种通信技术。Keywords:standard[ˈstændəd]n.标准WLAN['dʌbljulæn]n.无线局域网2-3MobileCommunicationIngeneral,weshoulddosomethingbasedon3Gandrealizethetransitionfrom3Gto4G,inordertoreachthestandardofthereal4G.总的来说，要全面顺利的实现4G通信，需直接在3G通信网络的基础设施之上，采用逐步引入的方法，使移动通信从3G逐步向4G过渡。Keywords:transition[trænˈzɪʃn]n.过渡，转变OralpracticeBill:Hi,Ellen!Couldyoutellmewhatmobilecommunicationis?Ellen:Well,Thereisoneortwopeoplemovinginthecommunication,whichiscalledmobilecommunication.Bill:Oh,canyoutellmesomethingaboutitsexperience?Ellen:Ofcourse!Ithasexperiencedfourstages:1G,2G,3Gand4G.Bill:Ihaveheardit.Thefirstgenerationofmobilecommunicationtechnologyiscalled1G.Thesecondiscalled2G,andthethird,thefourth…Ellen:Yeah!4Gisthelatestmobilecommunicationatpresent!OralpracticeBill:4Gisthecombinationof3GandWLANanditcanbeusedtotransmitthedata,audio,videoandimagerapidly.Ellen:Wecantalkalotaboutthemobilecommunicationinfuturewhenwefree!Bill:It’sverygood!ExercisesChoices：1.The

mobilecommunicationshasexperienced

stages.A.oneB.twoC.threeD.four2.

isthenewesttechnology.A.2GB.3GC.4GD.2.5G3.Theinformationbothvoiceand

canbetransmittedby3G A.dataB.e-mailC.imageD.VideoExercises4.

istheshortnameofthefirstgenerationmobilecommunication.A.1GB.2GC.3GD.4G5.Theinformationbothvoiceand

canbetransmittedby3G. A.dataB.e-mailC.imageD.videoExercisesTranslatethefollowingsentencesintoChinese:Themobilecommunicationisusedwidely.Couldyougivemeanexampleforthemobilecommunication?Wehavem