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日本总务省在不久前的信息通信审议会上宣布，日本将着手开发第四代移动通信系统，目标是在２０１０年之前达到实用化水平。 第一代移动通信系统是模拟式语音移动通信；第二代是数字语音移动通信，目前广泛使用的ＧＳＭ、ＣＤＭＡ就属于数字语音移动通信系统；第三代移动通信系
Japan’s Ministry of Internal Affairs and Communications announced at a recent ICT review meeting that Japan will set out to develop a fourth-generation mobile communications system with the goal of reaching a practical level by 2010. The first generation of mobile communication system is analog voice mobile communication; the second generation is digital voice mobile communication, currently widely used GSM, CDMA belong to the digital voice mobile communication system; the third generation of mobile communication system