An Enhancement of Multipath TCP Performance in Lossy Wireless Networks
An Enhancement of Multipath TCP Performance in Lossy Wireless Networks
复制标题
有损无线网络中多路径 TCP 性能的增强
DOI：
10.1109/lcn.2016.046
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
H. Shinbo
中科院分区：
文献类型：
--
作者：
K. Nguyen;G. Villardi;M. G. Kibria;K. Ishizu;F. Kojima;H. Shinbo
多路径TCP（MPTCP）是用于移动终端上的带宽聚合的可演进技术。MPTCP自然地并且同时地利用经由不同接口的无线链路（即，Wi-Fi和蜂窝）用于数据传输。理论上，MPTCP的聚合吞吐量优于或至少等于链路上的TCP吞吐量。然而，我们在有损无线环境中的MPTCP性能的调查表明，理论陈述并不总是成立的。具体地，MPTCP的聚合益处（即，与TCP相比）在链路上的损耗超过特定水平时变为负值。本文通过实验研究，寻找MPTCP聚合效益的负值区域。此外，我们提出了一个损失感知禁用机制，以绕过消极。当观测到的丢失值达到阈值时，该机制将无线链路临时切换到备份模式。我们集成了一个国家的最先进的MPTCP实现的机制，并在各种有损条件下比较两个MPTCP。评估结果证实了新提出的机制在提高产量和节省资源方面的有效性。
Multipath TCP (MPTCP) is an evolvable technology for bandwidth aggregation on a mobile device. MPTCP naturally and concurrently exploits wireless links via different interfaces (i.e., Wi-Fi and cellular) for data transferring. Theoretically, the MPTCP's aggregated throughput is better or at least equals to the TCP throughput over a link. However, our investigation of MPTCP performance in a lossy wireless environment shows that the theoretical statement does not always hold. Specifically, the aggregation benefit of MPTCP (i.e., in a comparison to TCP) becomes negative when the loss over a link surpasses specific levels. In this paper, we focus on finding the negative region of MPTCP's aggregation benefit by experimental study. Additionally, we propose a loss-aware disabling mechanism to bypass the negativity. The mechanism temporarily switches a wireless link to a backup mode when an observed loss value reaches a threshold. We integrate the mechanism with a state-of-the-art MPTCP implementation and compare the two MPTCPs in various lossy conditions. The evaluation results confirm the effectiveness of the newly proposed mechanism in terms of enhancing goodput and saving resources.