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当前互联网多径传输协议没有充分考虑路径差异性对协议设计的影响,难以有效地改善路径性能差异环境下多径传输的吞吐率。该文通过对多径传输协议吞吐率模型的分析,提出了一种基于最小反馈时延的多径应答(ACK)路径选择算法MFD。MFD算法通过网络测量选出反向时延最短的路径来传输应答分组,从而有效减小了各条路经的往返时延,进一步提高多径传输的吞吐率。给出MFD算法吞吐率和多TCP流吞吐率加和的比值关系,并估计出其上界,还通过模拟实验验证了比值关系的正确性。模拟实验结果表明:与现有的多径应答路径选择算法相比,MFD算法能获得更高的端到端吞吐率。
Currently, the Internet multipath transmission protocol does not fully consider the influence of path diversity on the protocol design, and it is difficult to effectively improve the throughput of multipath transmission in the path performance difference environment. In this paper, by analyzing the throughput model of multi-path transmission protocol, a multi-path response (ACK) path selection algorithm MFD based on minimum feedback delay is proposed. The MFD algorithm chooses the path with the shortest reverse delay to transmit the response packet through the network measurement, so as to effectively reduce the round trip delay of each path and further improve the throughput of the multipath transmission. The relationship between the throughput of MFD algorithm and the throughput of multi-TCP flows is given and its upper bound is estimated. The correctness of the ratio relationship is also verified through simulation experiments. The simulation results show that the MFD algorithm can achieve higher end-to-end throughput than the existing multipath response path selection algorithm.