实现组播模式下连续数据流的可靠传输

非实时大批量数据的组播传播是当前国际上重点研究的重要网络研究课题。文中针对点对多点通信模式下实现连续数据流可靠组播的问题，对目前存在的组播传输协议在实现可靠组播方面的优缺点进行了分析，在ＲＭＴＰ协议（一种可靠组播协议）的基础上，将需要传输的连续数据流划分为数据块（每个数据块由一定数量的数据包组成），并以数据块为单位通过ＲＭＴＰ协议进行可靠的组播传输，从而实现整个数据流的可靠组播传输。在构造组播树的

IMPLEMENTATION OF RELIABLE MULTICAST TRANSPORT OF CONTINUOUS DATA STREAM

The multicast transport of non-realtime bulk data is currently a hot research project in the field of network. In order to solve the problem of implementing the reliable transportation of continuous data stream, virtues and shortcomings of various existing reliable multicast protocols are analyzed in the present paper. Then, based on RMTP, an implementation scheme divides continuous data stream into data blocks, each block consisting of several packets, Through reliable multicasting each block, the whole data stream can be reliably multicast. It also adopts negative confirming to reduce the burden of sender. Also analyzed is the theoretic performance of RMTP. This protocol is implemented and the performance is tested and calculated in real environment. Finally, the reason of producing the difference between the result of test and that of the theoretic performance is studied.