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一、ＩＭＴ－２０００／ＵＭＴＳ业务介绍第三代移动通信系统是由国际电联（ＩＴＵ）于１９８５年提出的，称ＩＭＴ—２０００（ＩｎｔｅｒｎａｔｉｏｎａｌＭｏ－ｂｉｌｅＴｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎ），欧洲称为ＵＭＴＳ（ＵｎｉｖｅｒｓａｌＭｏｂｉｌｅＴｅｌｅｃ
I. Introduction of IMT-2000 / UMTS Services The third generation mobile communication system was proposed by the International Telecommunication Union (ITU) in 1985 and is called IMT-2000 (International Mobile Telecommunications). In Europe, the UMTS (Universal Mobile Telec)