摘要： 目前许多应用层组播协议缺乏明确的数据可靠传输保障机制。该文将NICE协议中原有的控制拓扑和数据拓扑改为环形的控制拓扑和最小延迟树的数据拓扑，在新的拓扑结构上建立差错控制机制，以保证组播的可靠性。仿真实验表明，改进后的组播协议在节点正常工作时具有完全的可靠性，在节点失效的情况下同样具有良好的健壮性。

关键词: 应用层组播, 差错控制, 可靠组播, 覆盖网

Abstract: Many application-layer multicast protocols are short of definite reliable transmission mechanisms. This paper changes the topology of control and data in NICE protocol, uses ring and minimal delay tree, and adds the corresponding error control mechanism to improve the reliability of NICE. Simulations show that the improved protocol has complete reliability in case all nodes work well and achieves a high delivery ratio when some nodes fail.

Key words: application-layer multicast, error control, reliable multicast, overlay

中图分类号: 

• TP393