一种基于速率的组播拥塞控制机制

分析了发送者驱动和接收者驱动的组播拥塞控制的优缺点,提出了一种基于速率,由接收者和发送者混合驱动的层次型组播拥塞控制机制RBMCC。在RBMCC中接收者计算本地丢失率,中间节点聚集所有来自其直接子节点的反馈报文,发送方通过最终的反馈报文计算TCP友好发送速率,实现对网络拥塞的快速、准确响应。仿真试验证明,RBMCC具有良好的可伸缩性与满意的公平性。

A Rate-Based Congestion Control Mechanism for Multicasts

Congestion control is key problem in designing multicast protocols. The merits and shortcomings of sender-drivered and receiver-drivered in congestion control are analyzed respectively. Then a congestion control mechanism for multicast, RBMCC that is rate-based and drivered mixedly by sender and receiver, is presented. In RBMCC, each receiver estimate its packet loss rate respectively and send ACKs to its parent, intermediate nodes aggregated these ACKs that come from all of children. TCP-friendly rate computed by sender provide timely and accurate response to the network congestion. The results of experimental simulation show that RBMCC is quite flexible with satisfactory equality.