This paper firstly elaborates the structure and characteristics of IMS, then discusses the HA architecture design for IMS
core network. It also puts forward an HA solutions in terms of Service processing, Platform software, network topology
and switch strategy. The backup mechanism of each module is described in detail.
This paper firstly analysed the requirements of IMS-based service network convergence; and then introduced the
network architecture and features of IMS, IMS service creation environment, IMS-based next generation network
convergence architecture, and IMS-based service convergence platform. Then the paper proposed an implementation of
IMS service triggering mechanism. Finally, the paper discussed the problems existing in service convergence.