IMS国际标准研究的最新进展

IP多媒体子系统（1MS）作为固定接入和移动接入的统一核心控制网络，采用控制和承载、控制和业务相分离的机制，网络能力得到很大增强。公众普遍认为IMS是现有网络演进和发展的方向。IMS的国际标准工作主要由第3代移动通信合作计划（3GPP）和电信、互联网融合业务及高级网络协议（TISPAN）标准组织完成。文章内容包括3GPPSDTISPAN对IMS的总体标准化情况，IMS的关键技术和热点问题的研究情况，涉及IMS网络核心控制部分的完善和增强、与IMS相关的互联互通、IMS与电路域（CS）并存下的一些问题、下一代网络（NGN）R2阶段有关的IMS研究。

The Latest Progresses in IMS Standardization

The IP Multimedia Subsystem (IMS),as the core control for fixed and mobile access,enhances network capabilities,by separating control functions from bearer and services. There has been a consensus that IMS is the development trend of future network. The IMS standards are mainly developed by the 3GPP and TISPAN. This article outlines IMS standardization activities in these two standards bodies,and key technologies and hotspot issues behind IMS touching upon improving and enhancing IMS core network,interconnecting with IMS,problems arising from coexistence of IMS and Circuit Switched (CS),and the IMS research related to NGN-R2.