通信与电子信息专业英语 课件 Unit 8 Mobile Communication.pptx

Unit8MobileCommunication

8.1From1Gto5G

8.2MobileNetworks

8.1From1Gto5GWordsandExpressionsBackgroundsText

WordsandExpressionsprototype n.原型；雏形；最初形态~(for/ofsth)thefirstdesignofsthfromwhichotherformsarecopiedordevelopedexample,model,archetype,pattern,paradigm,demoIt(thefirstgenerationmobilephone)wasinitiallydevelopedtouseinacar,thefirstprototypewastestedin1974.

WordsandExpressionsbandwidth n.带宽；频宽；带宽值channelbandwidth 频道带宽powerbandwidth 功率通带noisebandwidth 噪声带宽bandwidthdelayproduct 延迟带宽积Bandwidthdelayproductisameasurementofhowmanybitscanfillupanetworklink.

WordsandExpressionsswitching v.交换；交换技术；转变MSC:MobileSwitchingCenter移动交换中心circuitswitching 电路交换packetswitching 分组交换dataswitching 数据交换bandswitching 波段变换analogswitching 模拟交换digitalswitching 数字交换

WordsandExpressionsaccess n.接入；通道；通路；入径vt.接入；访问，存取(计算机文件)RAM:RandomAccessMemory随机存取存储器MAC:MediumAccessControl介质访问控制协议accesstechnique 接入技术;存取技术accessnetwork 接入网(a)TDMA;(b)FDMA;(c)OFDMA;(d)CDMA/SDMA;(e)possibleNOMAsolution.

WordsandExpressions8cellcoverage 小区覆盖；手机覆盖率roaming n.(移动电话的)漫游HLR:HomeLocationRegister 归属位置寄存器VLR:VisitorLocationRegister 访问位置寄存器Roamingreferstoawirelessnetworkserviceextensioninanareathatdiffersfromtheregisteredhomenetworklocation.漫游是指将无线网络服务扩展到与注册归属的网络位置不同的区域中。

WordsandExpressions9GSM:GlobalSystemforMobilecommunication 全球移动通信系统SMS:ShortMessageService(手机的)短信服务；(手机)短信，短消息spectralefficiency 频谱利用率Alsoknownasspectrumefficiencyorbandwidthefficiency,acellularnetwork'sspectralefficiencyisequivalenttothemaximumnumberofbitsofdatathatcanbetransmittedtoaspecifiednumberofuserspersecondwhilemaintaininganacceptablequalityofservice.

WordsandExpressions10encrypt vt.把…加密(或编码)decrypt 破译；解密encryptionkey 密钥capability n.性能；容量；能力；才能performance,property,functionoutputcapability