D-AIMD——一种改进的TCP拥塞控制机制

D_AIMD: An Improved TCP Congestion Control Mechanism

0引言 TCP是目前Internet中广泛采用的一种传输控制协议,为各主机之间提供可靠按序的传输服务[1].代P拥塞控制[1,2]机制是其成功应用于Internet的关键所在.TCP拥塞控制机制主要基于AIMD(α,b)(Additive-Increase MuItiplicative-Decrease)算法[3～7],即每一往返时间,拥塞窗口值增加a,而当网络发生拥塞时,拥塞窗口降为原先的(1-b)倍.

With the rapid growth of rate-based services and wireless applications,improving TCP congestion control has been becoming an important study task in network research fields . This paper first briefly introduces the AIMD (a.b)algorithm,and then presents an improved TCP congestion control(D_AIMD)whose principles and simulation results are discussed in detail. This mechanism can be easily implemented with lower additional overheads and can efficiently improve the networks communication performances.