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中文摘要：
提出了在多源组播路由过程中解决交互同步问题而无须使用同步控制器的思想，在这种思想的基础上进一步实现低延迟组播．主要贡献包括：（1）建立面向多点交互过程的同步模型及证明支持多点交互同步的组播路由定理；（2）提出一种有效的、低延迟的、支持多点交互同步的应用层组播路由算法；（3）采用教学方法对新算法和现有相关算法进行性能分析和对比．最后，通过仿真实验和实际应用表明，新算法是正确和有效的．
英文摘要：
This paper introduces an idea that solves the synchronization problem in the process of application-level multicast routing without using the dedicated synchronizing controller. Furthermore, the low-delay multicast communication is achieved on base of an idea. The contributions of this paper include： （1） The process of multipoint synchronizing interaction is modeled, and the theorem of application-level multicast routing algorithms supporting rnultipoint interaction synchronization is proved; （2） An effective low-delay multicast routing algorithm that supports multipoint interaction synchronization is proposed; （3） Performance analysis of this algorithm and the existing similar algorithm is carried out by mathematic methods. Both simulation experiments and practical applications demonstrate that the algorithm is correct and effective.
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