A MPTCP Scheduler for Web Transfer

A MPTCP Scheduler for Web Transfer
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用于 Web 传输的 MPTCP 调度程序

DOI:
10.32604/cmc.2018.03726
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发表时间:
2018
影响因子:
3.1
通讯作者:
Xiaoping Lou
Xiaoping Lou
中科院分区:
计算机科学4区
文献类型:
--
作者:
Wenjun Yang;Pingping Dong;Wensheng Tang;Xiaoping Lou

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多路径TCP(MPTCP)是TCP的最重要的扩展,它允许通过多条路径同时传输,以提高长流的资源利用率和吞吐量。然而,由于短流传输中的并发多路传输(CMT),每个MPTCP子流的拥塞窗口(cwnd)太小,当单个丢失数据包无法通过快速重传恢复时,可能导致超时。因此,与常规TCP相比,MPTCP对于短流的性能甚至更差。本文首先分析了MPTCP在短流上性能下降的主要原因,然后提出了MPTCP-SF,它动态地调整短流的子流数目。该算法首先分析Web对象的分布特征,提取两个阈值,用于对每个流进行分类。在接收到每个新的ACK之后,MPTCP-SF基于每个流周期性地对正在发送的数据进行计数,并且使用阈值来分类我们的流量。最后,针对不同的分类流,MPTCP-SF动态切换路径调度模型。我们在NS 3上进行了大量的实验,以评估其效率。我们的评估表明,MPTCP-SF减少短流的完成时间超过42.64%,与MPTCP相比,在WLAN/LTE无线网络中,MPTCP-SF在传输长流时实现的吞吐量比MPTCP高约11.11%。结果成功地验证了MPTCP-SF的改进性能。
: Multipath TCP (MPTCP) is the most significant e xtension o f 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 s mall 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 f o r e a c h f l ow . In pa rtic-ular, MP TCP-SF fir stl y 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 a n d u s es the t hreshold t o c l assify t h e we b l ows. Finally, MPTCP-SF dynamically switches path scheduling model for different classification flows. We conduct extensive experiments in NS3 to evaluate its e fficiency. 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.
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