摘要： 提出一种基于IMS的移动多媒体广播时移系统架构，该架构融合广播网络和无线移动通信网络，为移动多媒体广播提供时移服务，实现服务与接入无关。设计基于SIP的时移信令流程来完成对时移业务的支撑。利用排队论方法对时移请求信令延迟进行理论分析，结果表明信令延迟能够满足实时性需求，证明该系统是完全可行的。

关键词: 移动多媒体广播, 时移系统, IP多媒体子系统, 会话初始协议, 延迟

Abstract: This paper presents an IP Multimedia Subsystem(IMS)-based time-shifting system architecture for mobile multimedia broadcast. The architecture integrates broadcast network and wireless mobile communications network to provide time-shifting service for mobile multimedia broadcast, which achieves access independence. The Session Initialize Protocol(SIP)-based signaling flow is applied to support time-shifting service. This paper conducts a theoretical analysis of time-shifting signaling delay based on queuing theory. The results show that the signaling delay is acceptable according to the real-time requirements and proves that the system is feasible.

Key words: mobile multimedia broadcast, time-shifting system, IP Multimedia Subsystem(IMS), Session Initialize Protocol(SIP), delay

中图分类号: 

• TN919.85