A MPTCP Scheduler for Web Transfer  

作　　者：Wenjun Yang Pingping Dong Wensheng Tang Xiaoping Lou Hangjun Zhou Kai Gao Haodong Wang 

机构地区：[1]College of Information Science and Engineering,Hunan Normal University,Changsha,410081,Hunan,China [2]University of Science and Technology of China,Hefei,230026,Anhui,China [3]Hunan University of Finance and Economy,Changsha,410205,Hunan,China [4]Changsha University of Science&Technology,Changsha,410114,Hunan,China [5]Department of Electrical Engineering and Computer Science,Cleveland State University,Cleveland,OH 44115,USA

出　　处：《Computers, Materials & Continua》2018年第11期205-222,共18页计算机、材料和连续体（英文）

基　　金：This work is supported by the National Natural Science Foundation of China(No.61602171,61602172);Scientific Research Fund of Hunan Provincial Education Department(No.17C0960,16C0050);Hunan Provincial Natural Science Foundation of China(No.2017JJ2016).

摘　　要：Multipath TCP(MPTCP)is the most significant extension of TCP that enables transmission via multiple paths concurrently to improve the resource usage and throughput of long flows.However,due to the concurrent multiple transfer(CMT)in short flow trans-mission,the congestion window(cwnd)of each MPTCP subflow is too small and it may lead to timeout when a single lost packet cannot be recovered through fast retransmission.As a result,MPTCP has even worse performance for short flows compared to regular TCP.In this paper,we take the first step to analyze the main reason why MPTCP has the diminished performance for short flows,and then we propose M PTCP-SF,which dynamically adjusts the number of subflows for each flow.In particular,MP TCP-SF firstly analyzes the distribution characteristics of the web objects to extract two thresholds to be used for classifying each flow.After eceiving each new ACK,M PTCP-SF periodically counts the data being sent based on per-flow and uses the threshold to classify the we blows.Finally,MPTCP-SF dynamically switches path scheduling model for different classification flows.We conduct extensive experiments in NS3 to evaluate its efficiency.Our evaluation proves that MPTCP-SF decreases the completion time of short flows by over 42.64% com-pared to MPTCP,and the throughput achieved by MPTCP-SF in transmitting long flows is about 11.11%higher than that of MPTCP in a WLAN/LTE wireless network.The results successfully validate the improved performance of MPTCP-SF.

关 键 词：MPTCP short flow web transfer TIMEOUT path heterogeneity 

分 类 号：TN9[电子电信—信息与通信工程]