应用层组播动态调整问题的研究  

Research on dynamic adjust of application-layer multicast

作　　者：张更欣[1] 范国闯[1] 马志柔[1] 

机构地区：[1]中国科学院软件研究所,北京100190

出　　处：《计算机工程与设计》2011年第2期381-385,共5页Computer Engineering and Design

基　　金：国家863高技术研究发展计划基金项目(2009AA04Z153);国家科技支撑计划基金项目(2009BAG18B01);核高基重大专项基金项目(2009ZX01043-003-002)

摘　　要：通过分析影响应用层组播性能的因素及这些因素的变化对组播性能的影响,指出了在组播过程中随着成员的加入退出、网络波动和结点处理能力的变化,组播的结构和性能都会发生变化。在组播开始时构建的组播树无法适应这些变化,导致了组播性能的下降。针对该问题提出了在组播过程中根据变化调整组播树的结构,并给出了一种改善组播性能的动态调整算法。实验结果表明,动态调整算法能够有效的反映组播的结构、网络状况和结点情况,改善组播的性能。After analyzing the factors that influence the performance of application-layer multicast, a problem that may reduce the performance of multicast is proposed. The multicast structure and performance has changed as the members＇ join and quite, the chum of network and the variable ofmulticast members＇ process ability during the application layer multicast. The tree constructed initially cannot adapt to these changes, which leads to reduce the performance of multicast. To improve the multicast tree＇ s performance, a method called dynamic adjust of application-layer multicast, which adjust the multicast tree＇ s structure according to the changes of factors that influence multicast, is proposed. An algorithm of improving multicast tree is also pointed out. Finally, the feasibility of the method and algorithm is validated by experiment.

关 键 词：应用层组播 影响组播性能因素 组播树的优化 动态调整 优化组播性能 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]