利用网格技术实现流媒体服务迁移

流媒体服务正在成为当今网络服务的代表性应用。为了提高流媒体服务的可用性，保证服务质量，快速高效的流迁移是研究中的重点和难点。本文探讨了流媒体服务迁移面临的关键问题，利用网格技术在实现流媒体服务迁移方面的优势。结合RTSP会话和流媒体传输监控技术，丈中在自发研制的流媒体服务网格NDSSG中实现了一个流媒体服务迁移系统，解决了因服务器故障造成的服务不可用问题以及可能的负载不平衡问题。在NDSSG中的实践证明：利用先进的网格技术可以实现高性能的流媒体服务迁移，可以有效提高流媒体服务的性能和质量。

Implementing Hand-off of the Streaming Media Service with Grid Technology

Streaming media service is getting to be a typical application among today's network services. In order to im- prove the availability of the streaming media service and guarantee the quality of service, it is important but difficult to make the stream hand-off quick and efficient. This paper simply introduces the key problems which the hand-off of streaming media service is facing and the advantage of the grid technology to implement the hand-off of streaming media service. Combining RTSP sessions and the monitoring technology on streaming media transmission, it implements a hand-off system of the streaming media service in the Globus-based streaming media service grid NDSSG, which can support the hand-off that occurs when the server breaks down or load-balancing happens. It proves by the practice in NDSSG that applying the advanced grid technology can implement highly efficient hand-off of the streaming media serv- ice, can effectively improve the performance and quality of the streaming media service.