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一、系统概述ＵＭＴＳ(Ｕｎｉｖｅｒｓａｌ ＭｏｂｉｌｅＴｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎ Ｓｙｓ－ｔｅｍｓ,通用移动通信系统)是采用ＷＣＤＭＡ空中接口的第三代移动通信系统,标准由３ＧＰＰ具体定义。ＷＣＤＭＡ可以采用ＦＤＤ与ＴＤＤ模式,其３ＧＰＰ版本分为Ｒ９９、Ｒ４和Ｒ５版。Ｒ９９于２０００年６月版本基本稳定,９月份版本比较成熟、完善,其Ｉｕ、Ｉｕｂ、Ｉｕｒ接口均采用ＡＴＭ和ＩＰ方式,网络是以ＡＴＭ交换为核心的网络,电路与分组交换节点逻辑上分开。Ｒ４、Ｒ５提出了基于ＩＰ的核心网结
First, the system overview UMTS (Universal Mobile Telecommunication Sys-tems, Universal Mobile Telecommunications System) is the third generation mobile communication system using WCDMA air interface, the standard defined by the 3GPP. WCDMA can adopt FDD and TDD mode, its 3GPP edition is divided into R99, R4 and R5 edition. R99 in June 2000 version of the basic stability of the September version of the more mature and perfect, its Iu, Iub, Iur interfaces are used ATM and IP, the network is based on ATM switching network, the circuit and packet switching nodes logically separate . R4, R5 proposed based on IP core network node