文档介绍：全球IMS产业发展研究报告2009全球IMS产业发展研究报告2009北京诺达咨询有限公司2009年2月正文目录第1章 .................................................................................................................................7研究背景.................................................................................................................................7研究方法.................................................................................................................................8 IMS概述..............................................................................................................................9IMS概念.................................................................................................................................9IMS出现背景.........................................................................................................................9IMS特点...............................................................................................................................10IMS与几种技术的关系...........................................................................................................................................................................................................10IMS和P2P的关系.......................................................................................................11IMS和NASS、RACS的关系.....................................................................................12IMS和FMC的关系.....................................................................................................13IMS与3G/宽带网络的关系.......................................................................................14目前IMS面临的技术挑战................................................................................................................................................................................................................................