第三代无线移动通信系统方案及关键技术

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Third-generation wireless mobile communications systems solutions and key technologies
First, second-generation cellular mobile communications systems for traditional voice and low rate data services system. And in the future "information society", image, voice; data on the combination of high-speed multimedia services and business data services will exceed the volume of traditional business. Therefore the current cellular mobile communication system is not only far from being able to meet future business needs of users, and along with the surge in the number of users will also be far from enough to meet users of the development needs of passengers. In addition, as the 'information super highway "built land-based network of public transport in many businesses, will also work with mount mobile communication system. So for the next generation of mobile and personal card system that is the first king on behalf of and personal communication systems research and development of the field of telecommunications is increasingly becoming a new hot spot.

第三代无线移动通信系统方案及关键技术
 第一、二代蜂窝移动通信系统是针对传统的话音和低速率数据业务的系统。         而在未来的“信息社会”，图象、话音；数据相结合的多媒体业务和高速率数据业务的业务量将超过传统的业务量。因此现在的蜂窝移动通信系统不仅远远不能满足未来用户的业务需求，而且随着用户数量的猛增，也将远远不能满足用户客量的发展需要。另外，随着‘信息高速公路”的建成，公共陆地网传输的许多业务，也将与移动通信系统卡口。所以对于新一代的移动和个人通卡系统即第王代和个人通信系统的研究和发展日益成为电信领域的一个新热点。
 第三代移动通信系统的技术方案
 第三代移动通信系统是指能够满足国际电联（ITU）提出的IMT－2000系统要求的新一代移动通信系统。IMT－2000系统的基本特征是：
 ·全球范围设计的高度兼容性；
 ·IMT－2000中的业务与固定网络的业务兼容；
 ·高质量；
 ·手机体积小，具有全球漫游能力；

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