基于AIMD算法的TCP拥塞控制机制改进

Improvement of Transmission Control Protocol(TCP) Congestion Control Mechanism Based on AIMD Algorithm

基于 AIMD算法的随机模型推导了当网络采用主动队列管理时的 TCP吞吐率公式 .提出了一种改进的 TCP拥塞控制机制 .新机制在发送端采用了修改过的 AIMD算法 ,在接收端采用了RTT预测补偿机制 .仿真结果表明 ,它在与现有 TCP竞争带宽时具有 TCP友好性 .与普通 TCP相比 ,其流量抖动较平缓并且可以在 TCP连接具有不同 RTT时提高带宽分配的公平性 ,因此适合于承载多媒体应用 .

Based on the stochastic model of AIMD algorithm, this paper derived the TCP throughput formula when active queue management is used. An improved TCP congestion control mechanism was proposed. The improved TCP adopts a modified AIMD algorithm in its sender and uses an RTT prediction and compensation mechanism in its receiver. The improved TCP is TCP friendly when competing with the existing TCP. Compared with the normal TCP, its send rate changes smoothly, and it can improve fairness of TCP in the heterogeneous RTT case. The improved TCP is suitable to carry multimedia applications.