摘要： 针对应用层组播中节点的异质性以及度约束问题，提出一种基于多描述编码的资源均匀分布方案。根据子描述资源的引用和复本状态，通过分布式算法实现子描述在节点中的均匀分布。根据节点间的可用带宽，利用加权选择算法获取请求集，从而实现节点的负载均衡。仿真结果表明，该方案能降低节点失效对图像质量的影响，具有良好的扩展性和健壮性。

关键词: 多描述编码, 均匀分布, 应用层组播, 节点贡献率, 可扩展性

Abstract: Aiming at the problems of heterogeneity and degree constraint of node in application layer multicast, this paper proposes a resource uniform distribution scheme based on multiple description coding. The uniform distribution of sub-descriptions among nodes is achieved with distributed algorithm in terms of the cited time and the numbers of copy. The request set is acquired by weighted selection algorithm, then the load of nodes is balanced. Simulation results demonstrate that the scheme can lower the impact of nodes departure, and it has high scalability and robustness.

Key words: multiple description coding, uniform distribution, application layer multicast, node contribution rate, scalability

中图分类号: 

• TP393