一种基于多描述编码的应用层组播模型  

Multiple description coding based model for application layer multicast

作　　者：张有为[1,2] 吴黎兵[2] 吴产乐[2] 

机构地区：[1]长江大学计算机科学学院,湖北荆州434023 [2]武汉大学国家多媒体软件工程技术研究中心,武汉430072

出　　处：《计算机应用研究》2010年第10期3932-3934,共3页Application Research of Computers

基　　金：国家自然科学基金资助项目(60672051);中国博士后特别资助项目(200902450);武汉大学自主创新科研资助项目(6081013)

摘　　要：为解决流媒体系统中基于多描述编码的多树模型所存在的同步问题,提出了一种基于多描述编码的层次组播模型。该模型中,相邻层的节点之间采用多对一的传输方式,并通过描述资源的均匀分布实现系统的快速收敛,以最大覆盖算法为节点获取最大的描述集和请求分布,在获得高质量视频的同时提高系统的鲁棒性。仿真实验表明,该模型以较小的协议开销获得了较好的视频质量,实现了动态环境中较高的系统可靠性。This paper proposed a novel hierarchical multicast model based on multiple description coding to address the synchronization of descriptions in multiple trees for streaming media system. Many to one transmission style was adopted within the neighboring layers,achieved fast convergence by uniform distribution of descriptions,and the maximum description set and request covering were worked out with maximum covering algorithm to achieve the robustness of system and high video quality simultaneously. Simulation experiments demonstrate that good video quality and high reliability in dynamic situation are achieved with low overhead.

关 键 词：应用层组播 多描述编码 快速收敛 均匀分布 最大覆盖 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]