基于多播树的组同步研究

Study on Group Synchronization Based on Multicast Tree

组同步是多用户系统中一种重要的同步技术．在分析造成组成员不同步原因的基础上,提出了基于多播树的组同步方 法,从信息传输的角度解决组同步问题．利用生成具有延迟限制的最小延迟抖动多播树,来传榆信息,并根据网络拓扑结构和延 迟的变化,对多播树进行动态调整,在满足系统实时性的前提下,使信息到达所有节点的时间差保持最小,从而实现组成员间的 同步．实际测试结果表明,基于多播树的组同步方法有效地减少了系统的延迟抖动,取得了显著的组同步效果．

Group synchronization is an important synchronization technology for multi-user systems. Based on analysis of the factors causing asynchronism between users, a group synchronization method based on multicast tree is presented to solve the problem from the point of transmission view. In order to transmit messages, a multicast tree with minimum delay jitter and delay bounded is built, and it is adjusted according to the changing of the topology and delay of the web. In the precondition of real-time, the method keeps the difference of arriving time minimum, and achieves synchronization between users. Practice testing result shows that the method reduces the delay jitter efficiently, and obtains group synchronization notability.