流媒体网格系统信息服务需要整合网格系统中各种静态、动态的资源信息,提供统一的信息访问接口.G lobus M DS提供了一种网格信息服务系统,适用于计算网格的信息服务,但不能完全适用于流媒体网格.介绍了G lobus的信息服务模型,讨论如何基于G lobus M DS构建适合流媒体网格的信息服务系统.针对G lobus M DS的层次式查询机制,使用信息缓存和哈希查询技术对其进行改进.实验表明,改进的查询机制可以提高信息的查询效率,满足实时流媒体服务要求.
There are two new trends in today's computer technology that are attracting more and more attention. Oneis multimedia service,especially the video service. The other is mobile wireless computing. The former can be implemented efficiently on the traditional wired network,such as the accession of multimedia information,real-time broad-cast. But due to the limitation of the wireless environment,the latter hasn't been able to support the video transport efficiently. Obviously,the combination of these two technologies,video service over wireless network,may be a killer application and in turn advances both of them. This paper summarizes the challenges of this field and introduces some possible solutions.
The multicast of Streaming Media over the Internet is an important component of many current and future Internet applications. The heterogeneity and lacking of QoS guarantee make the application of this technique a challenge. In this paper, we analyze the difficulties in streaming media multicast design, survey technologies that have been proposed for it. We also discuss several congestion control and error control mechanisms. Finally we present some remained issues for further research.
