一种基于目标速率的网络公平性算法设计

面向连接的TCP和无连接的UDP流在拥塞发生时对拥塞指示的不同响应方式,导致了对网络资源的不公平使用问题。提出的调整随机早期检测算法MRED是对已有的RED算法较小的一种改进算法。MRED算法根据TCP吞吐量模型发送速率上界与UDP业务流的目标速率比较,得到吞吐量与数据包丢失率关系曲线,通过在网络节点控制数据包丢失率来调节UDP业务流的吞吐量,可以改变其对于网络拥塞的响应方式。仿真结果表明,采用MRED算法有利于提高网络资源共享的公平性。

Target Rate Based Arithmetic Design on Network Fairness

Connection-oriented TCP flows and non-connection-oriented UDP flows have different response manners to the congestion indication while the network congestions are arisen, which makes for the unfair usage to the network resources. The proposed algorithm, called Modified Random Early Detection(MRED), is a tiny modified algorithm to the existed Random Early Detection. Firstly, MRED compares the send rate upbound of the TCP throughput modal with the tartet rate of the UDP flows, and then the relation curves can be gained about throughput and packets drop probability. Secondly, by controlling the packets drop probability on the network nodes, the throughput of the UDP flows can be adjusted and transforms the response manners to the network congestion. At last, simulation results show that MRED algorithm can increase the fairness of the network resources share.