交换式以太网中连续实时流媒体的可靠组播

Reliable Multicast for Real-Time Continuous-Media Streams over Switch Ethernet

对目前局域网中连续实时流媒体的可靠组播进行了研究.首先分析了局域网影响可靠组播的几个特性,然后设计了局域网内针对连续实时流媒体的基于重传的可靠组播传输协议.协议中的错误恢复首先利用接收者检测包丢失,同时采用NAK(negative acknowledgment)抑制减少产生的反馈包;然后发送者根据NAK请求重传已经丢失的数据包;接收者根据本地播放时间限制决定接收或者丢弃迟到的重传包.实验结果和性能分析证明了该可靠组播协议的可靠性和有效性.

A reliable multicast protocol for real-time continuous-media streams on switch Ethernet after research of the LANs' special features for reliable multicast is proposed. The recovery of this protocol begins with the receiver's detection of packet loss by packet's number, and the second step of it is the NAK (negative acknowledgment) suppression procedure. Then the sender will retransmit the lost packet by the received NAK, and finally the receiver will discard or accept the recovered packet based on the limit of the real-time playback. The experimental results and the analysis of performance demonstrate the effectiveness and reliability of the approach.