IMS Handoff Research And IMS Application Development

IMS (IP Multimedia Subsystem) is not only the core technology for next generation networks, but also for resolving integration of mobile and fixed networks, introducing the different mode of service of voice, data, video triple integration. As for IMS industry chain developmenmt, there are still many issues to be addressed at present. In the technical standards, IMS mobile management mechanism is not perfect enough, IMS is not suitable for real-time applications, can not guarantee the continuity of conversation; at the product level, lack of attractive new service and new applications, business models and profit model are uncertain.This paper analyses the IMS network architecture and the requirements of mobility management, make theory and quantitative analysis of the mobile IP protocol and SIP mobility management mechanism, proposes a seamless switching solution that suitable for the IMS heterogeneous network environment, the solution reducing the handoff delay by advanced address reservation, and reducing packet lost by advanced data transmitted. This solution do not need additional network components , it's easy to implement.By analysing the IMS network applications, this paper presents an IMS-based innovative business applications: audio and video interviews service. The service based on the IMS, and make full use of the facilities provided by the IMS and the flexibility of SIP, solve the current lack of valuable 3G network applications, and to enhance the user experience. This paper also conduct a detailed functional analysis and system design.