多投报文传输协议的性能分析

An Analysis of Packet Flow of the Multicast Transmission Mode

主要研究计算机网络中“多投”（Ｍｕｌｔｉｃａｓｔ）传输协议的性能分析方法。推导出了各种复杂网络拓扑结构下多投报文时的报文流量计算公式；具体分析和比较了“基于发送方”和“基于接收方”两种可靠多投方法中系统产生的应答报文（ＡＣＫ／ＮＡＫ）流量；并进一步得出，当线路报文传输错误概率较小时，“基于接收方”比“基于发送方”可靠多投方法要好的结论。

In this paper the regular approach for analyzing the reliability of the packet multicast is studied. Some basic formulae for analyzing multicast reliability are derived,making it easy to analyze the reliability for complicated networks. As an example, the performances of “sender initiated” and “receiver initiated” reliable multicast protocols are analyzed and compared by employing the formulae. It is shown that the latter is better than the former when a packet transmission line has a small error probability.