抑制CMT中乱序程度的路径优化方案

摘要

为减轻并行多路径传输(CMT)中接收端的乱序程度,文中提出了一种新的路径优化方案.该方案以MPTCP协议为基础,在三维笛卡尔坐标系下建立基于路径往返时延、丢包率和带宽的路径评价模型,将二分法与改进的基于密度的聚类分析方法相融合,根据所需路径数在坐标系下选择出一组带宽大、丢包率小且时延差也小的路径作为活跃路径.仿真结果显示,本方案与基于权重的路径选择方案相比降低了接收端的乱序长度与重传数据包个数,从而可以提高吞吐量与数据包传输速率.%In order to lighten the disorder degree at the receiving side in concurrent multipath transfer(CMT),a new path optimization scheme was proposed in this paper based on MPTCP protocol.In this scheme,a geometric path evaluation model is established based on path delay,packet loss rate and bandwidth in three-dimensional cartesian coordinate system(3D).In oder to select a set of active paths with large bandwidth,small packet loss rate and small delaydifference from the geometric path evaluation model according to the required number of paths,the dichotomy is combined with the improved density-based clustering analysis method.Simulation results demonstrate that the proposed scheme can reduce the disorder length and the number of retransmission packets,and can improve the throughput and packet transmission rate.