第二代移动系统技术还在如火如荼地发展,第三代技术的战斗号角就已经吹响,为世界提供了创建单一全球标准的机遇。 二十世纪移动通信需求迅猛增长。在不足二十年的时间里,全球无线通信用户数就达到2000万以上,据预测,到21世纪初将超过5亿。无线技术的繁荣无疑归功于如GSM、CDMA和TDMA等第二代数字蜂窝技术的推广利用。现在,随着新世纪的临近,无线通信世界正走向 The second generation of mobile system technology is still in full swing, and the battle horn of third-generation technology has been sounded, giving the world an opportunity to create a single global standard. The demand for mobile communications in the twentieth century has grown rapidly. In less than two decades, the number of wireless communication users in the world has reached more than 20 million. It is predicted that by the early 21st century, it will exceed 500 million. The prosperity of wireless technology is undoubtedly due to the promotion and utilization of the second generation digital cellular technologies such as GSM, CDMA and TDMA. Now, as the new century approaches, the world of wireless communications is moving forward