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移动通信是通信领域中发展最快的部分之一,第二代移动通信系统在全世界已经得到广泛应用,而为了解决第二代系统在频谱利用和其它方面的不足,人们研究和开发了第三代移动通信系统.目前第三代移动通信系统的标准化工作正在进行中,商用第三代网络将于2005年左右在世界各地投入使用.为了保持移动通信业务的连续性以及保护在第二代移动通信网络上的巨额投资,要求第三代移动通信网络能够与第二代核心网络兼容,这就对整个第三代移动通信网络各方面技术提出了很高的要求.
Mobile communication is one of the fastest growing areas in the field of communication. The second generation of mobile communication system has been widely used all over the world. In order to solve the second generation system’s lack of spectrum utilization and other aspects, Three generations of mobile communication systems At present, the standardization work of the third generation mobile communication systems is underway, and the commercial third generation networks will be put into operation all over the world around 2005. In order to maintain the continuity of mobile communication services and to protect the second generation The huge investment in the mobile communication network requires the third generation mobile communication network to be compatible with the second generation core network, which places high demands on the technologies of all aspects of the third generation mobile communication network.