Abstract: Comprehensive review and analysis of the standardization process on Next Generation Network (NGN) from the point of view of telecommunication community were made. It covered the concept and connotation of NGN, NGN standardization process, and future development. An emphasis had been given to techniques such as softswitching, IP Multimedia Subsystem (IMS), and MPLSbased IP carrier backbone networks. Finally, the author pointed out: Internet technologies had provided challenges as well as opportunities for common carriers in the long run; matured techniques, especially those with high performance/price ratio would dominate the future.

Key words: Next Generation Network (NGN), soft-switching, IP multimedia subsystem, IP-based carrier backbone

摘要： 对国际电信联盟（ITU）及国内外电信行业有关下一代网络(NGN)的标准化工作进展情况进行了全面的分析与综述，内容涉及电信业 NGN的概念与内涵以及相关工作的标准化进程与前景。重点讨论了软交换技术、IP多媒体子系统（IMS）和基于MPLS的IP承载网相关的技术。最后指出：互联网技术给传统的电信网络运营商既带来挑战，也带来机遇，NGN的实现是一个长期的过程，成熟技术与高性价比的技术将最终占据主导地位。

关键词: 下一代网络, 软交换, IP多媒体子系统, IP承载网