摘要
本文讨论了应用层组播环境下拥塞对扩展树性能的影响 ,提出了使用层间冗余链路来增强扩展树稳定性的方法 ,并且通过提出的统计链路模型和相关度模型 ,对该方法进行了理论分析和性能评价 .数字仿真结果说明了统计链路模型有效地描述了应用层组播环境中发生的拥塞 ,即使在高拥塞链路概率的情况下 ,层间冗余链路的方法也能以较小的网络延迟代价 ,显著地增强扩展树的稳定性 .本文提出的统计链路模型也可用来深入了解应用层组播的动态行为 。
This paper investigates the impact of congestion on the performance of spanning trees in Application-layer Multicast (AIM) environments and proposes using redundant links between adjacent levels to enhance the stability of spanning trees. We analyze this approach by developing a simple statistical link model which describes congestion occurring in spanning trees and by introducing a dependency-degree factor which models the dependence between adjacent links. The numerical simulation results indicate that the statistical link model well describes the congestion occurring in spanning trees for ALM, and that even in case of high congestion probability, the redundant links scheme can significantly enhance spanning trees' resilience to congestion at a low cost of additional network delay. The proposed statistical link model is generic and can be utilized not only to further understand the dynamics in ALM, but also to design algorithms of congestion control for ALM.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2004年第11期1844-1848,共5页
Acta Electronica Sinica
基金
国家自然科学基金项目 (No 60 2 730 0 8)
国家高技术研究发展计划 (863) (No 2 0 0 2AA1 1 90 4 0 )
关键词
应用层组播
统计链路模型
层间冗余链路
Computer simulation
Congestion control (communication)
Mathematical models
Probability
Statistical methods
Telecommunication links
Trees (mathematics)
