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在分析了树型和环型结构特点的基础上,该文提出一种基于树-轮拓扑结构的应用层组播模型。模型采用定域过程将距离近的节点集中在一起组成一个车轮结构,并利用近似平衡二叉树产生算法将轮心节点构建成一个时延最小的二叉树,以提高数据转发的效率。仿真结果表明,该模型具有较低的端到端延迟和链路压力以及较小的路径伸展率和控制开销,适用于大规模且实时性要求较高的应用层组播环境。
Based on the analysis of the characteristics of tree and ring structure, this paper proposes an application layer multicast model based on tree - wheel topology. In the model, the nodes near the nodes are grouped into a wheel structure by using the localization process, and the wheel center node is constructed into a binary tree with the least delay by using the approximate balanced binary tree generation algorithm to improve the efficiency of data forwarding. Simulation results show that the proposed model has lower end-to-end delay and link pressure, smaller path extension rate and control overhead, and is suitable for large-scale and real-time application-level multicast environments.