基于最小反馈时延的多径应答路径选择算法  

Minimum feedback delay based ACK path selection algorithm for multipath transfer

作　　者：阳旺[1] 李贺武[2] 吴茜[2] 吴建平[1,2] 

机构地区：[1]清华大学计算机科学与技术系,北京100084 [2]清华大学信息网络工程研究中心,北京100084

出　　处：《清华大学学报（自然科学版）》2011年第7期933-936,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八六三"高技术项目(2008AA01Z212);国家科技重大专项项目(2008ZX03003-005);国家科技支撑计划项目(2008BAH30B10;2008BAH37B09)

摘　　要：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。Existing multipath transfer protocols do not sufficiently consider the multipath asymmetry,so they are not able to achieve the best throughput with asymmetry paths.A multipath throughput model was used to develop a minimum feedback delay（MFD） ACK（acknowledgement） path selection algorithm.This algorithm selects the fastest reverse path through network measurements for the ACK packets,which improves end-to-end throughput by reducing the round trip time of each path.The throughput gain over aggregated TCP Reno and its upper bound is given and verified by simulations.The throughput is compared with existing ACK selection algorithms by simulations to show that this algorithm can achieve higher end-to-end throughput.

关 键 词：多径传输 应答路径选择 反馈时延 单向路径时延 带宽聚合 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]