Abstract: This paper puts forward a kind of IP layer multicast congestion control algorithm based on hop to hop RED, proves its usefulness based on mathematics, and proves the STSR congestion control algorithm has a smaller congestion probability under the buffer area sharing than separating on the information frames transmit under the different priority policies, the STSR congestion control algorithm responding sensitively to network congestion and having larger networks throughput. It simulates the STSR model with NS-2, proving the STSR algorithm can ensure the TCP friendly and realizes the distributed control theory of coarser granularity. This conclusion has great realistic significance to the multicast congestion control research.

Key words: Hop to hop RED, Multicast, Congestion control, Buffer sharing, TCP friendly

摘要： 提出了一种基于逐段RED的网络层组播拥塞控制机制，并对其有效性进行了数学推证，证明了信息包在不同优先级的转发约束下，STSR拥塞控制模型的缓冲区共享策略发生拥塞的概率小于分用策略，且STSR具有更高的敏感度和更大的网络吞吐量。利用NS-2对STSR拥塞控制进行了模拟，证明了STSR能保证对TCP流的友好，并实现了较粗粒度下的分布式控制。这一结果的取得对于组播拥塞控制的相关研究具有很大的指导意义。

关键词: 逐段RED, 组播, 拥塞控制, 缓冲区共享, TCP友好