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应用层组播具有简单灵活易部署的优点,获得了广泛应用,但其存在时延较大问题,对性能影响较大.针对此问题,该文提出一种低时延应用层平衡二叉组播树模型,利用平衡二叉树的低深度特性,构建出深度较低的组播树,降低了应用层组播的传输时延.当节点加入或退出组播时,设计组播树维护算法使得组播树的时延变化较小,满足低时延要求.最后通过计算机仿真,表明该模型减少了应用层组播的传输时延,改善了应用层组播性能,适合应用在大规模实时多媒体环境中.
Application layer multicast has the advantages of simple and flexible deployment and is widely used, but it has a large delay and has a great impact on performance.In view of this problem, this paper proposes a low latency application layer balanced binary group Broadcast tree model, using the low-depth characteristics of the balanced binary tree to construct a lower-depth multicast tree, reducing the application layer multicast transmission delay.When nodes join or leave multicast, the design of multicast tree maintenance algorithm makes the group The time delay of broadcast tree is small, which meets the requirements of low latency.Finally, the simulation results show that the model reduces the transmission delay of application layer multicast and improves the application layer multicast performance, which is suitable for large-scale real-time multimedia environment in.