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通信工程专业英语 Lesson 23 Third-Generation Mobile Phone Networks 第23课 第三代移动电话网
邓 磊 (Some pictures are from the Internet) 东莞理工学院 电子工程与智能化学院 /07
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Outline Technical Contents Technical Terms Structures and Sentences
3G Overview 3G概述 Cellular Design 蜂窝设计 Network Architecture 网络结构 Handover 越区切换 Security 安全性 Trend 趋势 Technical Terms Structures and Sentences
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3G Overview 3G概述
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Cellular Design 蜂窝设计
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Network Architecture 网络结构
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Handover/Handoff 越区切换
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Security 安全性 SIM card as a security token
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Trend 趋势
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Technique Terms switch vt & n. 交换,交换机
authentication [ɔː,θentɪ'keɪʃən] n. 认证 authorization [ɔːθəraɪ‘zeɪʃ(ə)n] n. 授权 air interface 空中接口 profile information 概要信息 quality of service 服务质量 cryptographic key 密钥 public key 公钥 encryption scheme 加密方法 WCDMA abbr. Wideband Code Division Multiple Access 宽带码分多址 SIM abbr. Subscriber Identity Module 用户身份模块 LTE abbr. Long Term Evolution 长期演进
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Structures and Sentences
Modern 3G systems allow each cell to use all frequencies, but in a way that results in a tolerable level of interference to the neighboring cells. 现代3G系统允许每个小区使用所有频率,但是必须以一种使相邻小区的干扰处于可容许水平的方式进行。
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Structures and Sentences
The term (air interface) is a fancy name for the radio communication protocol that is used over the air between the mobile device and cellular base station. 空中接口这个词是对用于移动用户和蜂窝小区之间的无线通信协议的一个炫酷称呼。
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Structures and Sentences
This way of doing a handover is called a soft handover to distinguish it from a hard handover, in which the mobile disconnects from the old base station before connecting to the new one. 这种切换方式叫做软切换,以区分于硬切换。在硬切换中,移动端在连接到一个新的基站前必须和旧基站断开。
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HW2 Reminder 英文写作作业2 发送电子版到邮箱:denglei@dgut.edu.cn
题目:The evolution of mobile communication system: from 1G to 5G 字数限制: 个单词 截止日期: , 23:59 (第11周周三) 电子版格式: PDF 电子版文件名: HW2_姓名_学号.pdf 邮件主题:HW2_姓名_学号 邮件主题请务必按此格式,否则无法收到自动回复
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Final Exam 期末考试时间 地点 2018年11月21日(12周周三)晚上19:00-21:00, 6E-306 (课头1)
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Thank You!
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