【作者】 郑杰比；

【导师】 高锦春；

【作者基本信息】 北京邮电大学 ， 计算机应用技术， 2008， 硕士

【摘要】 IMS(IP多媒体子系统)是下一代网络的核心技术,也是解决移动与固网融合,引入语音、数据、视频三重融合等差异化业务的重要方式。IMS的产业链发展,在现阶段还存在诸多需要解决的问题。在技术标准方面,IMS的移动性管理机制不够完善,不适合IMS中实时业务的应用,无法保证会话的连续性;在产品层面,缺乏吸引人的新业务和新应用,商业模式和盈利模式不够明朗。本文分析了IMS网络架构及其对移动性管理的要求,对移动IP协议和SIP移动性管理机制进行理论和定量分析,提出一种适合于IMS异构网络环境的无缝切换解决方案,该方案通过提前的地址预留,数据转发,降低了切换时延和分组丢失,并且该方案不需要增加新的网络元件和更改网络拓扑结构,易于实施。在对IMS网络应用模式分析的基础上,本文提出了一种基于IMS的具有创新意义的业务应用:观众音频视频采访业务。该业务基于IMS系统,充分利用了IMS业务提供的便利性及SIP协议的灵活性,解决了当前3G网络应用匮乏的问题,并增强了用户体验,并对该业务进行详细的功能分析和系统设计。更多还原

【Abstract】 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.更多还原