在２０世纪的最后２０年内，现代移动通信技术走过了第一代（模拟系统）和第二代（窄带数字系统）两个阶段。在新千年之交的时期，将要完成第三代移动通信（正式名称为ＩＭＴ－２０００）标准的制定工作，为今后１０余年移动通信的发展打下基础。 国际电联（ＩＴＵ）于１９８５ In the last two decades of the twentieth century, modern mobile communications technology has gone through two phases, the first generation (analogue system) and the second generation (narrowband digital system). At the turn of the new millennium, the formulation of the third generation mobile communications (formally called IMT-2000) standard will be completed, laying the groundwork for the development of mobile communications over the next 10 years. International Telecommunications Union (ITU) in 1985