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拥塞控制是组播服务需要解决的重要问题.当存在大量异质的、传播时延较高的组播接收者时,到达源端的反馈在一定程度上已经过时,因此常常严重影响控制效果.提出了一种分布式、自调节的显式速率比例控制方案,它在源端和中间节点实施控制算法调整各自的发送速率,并且比例控制系数会根据路由器缓冲区占有量偏离理想值的程度自动调节.这种网络参与控制的主动行为比传统路由器尽力服务的工作方式对网络状态的响应更加迅速,自调节的控制系数比固定的控制系数更能及时调节发送速率.仿真实验结果表明,算法具有响应快、链路利用率高和路由器缓冲区占有量比较稳定的特性.
Congestion control is an important problem to be solved in multicast services.When there are a large number of heterogeneous multicast receivers with high propagation delay, the feedback to the source is outdated to a certain degree, which often affects the control performance seriously. A distributed, self-adjusting explicit rate scaling control scheme implements control algorithms at the source and intermediate nodes to adjust their respective sending rates and the scale control factor automatically adjusts to the extent that the router buffer occupancy deviates from the ideal value . This active network participation in control than the traditional router service mode of work to respond more quickly to the network state, self-adjusting control coefficient than the fixed control factor to adjust the sending rate in time.Experimental results show that the algorithm has a response Fast, high link utilization and router buffer share more stable features.