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ThinkMind // INNOV 2017, The Sixth International Conference on Communications, Computation, Networks and Technologies // View article innov_2017_1_30_70026


A Solution for Bufferbloat Problem in Upload TCP Communication over IEEE 802.11n WLAN Only by Modifying Access Point

Authors:
Masataka Nomoto
Celimuge Wu
Satoshi Ohzahata
Toshihiko Kato

Keywords: Wireless LAN; IEEE 802.11n; TCP; Dymamic Rate Switching; Bufferbloat Problem; Block Acknowledgment.

Abstract:
IEEE 802.11n wireless local area networks (WLANs) suffer from Bufferbloat problem such that the round-trip delay increases in upload transmission control protocol (TCP) communications when the media access control (MAC) level data rate is low such as 6.5 Mbps. This problem degrades user level quality of service for communications sharing the WLAN transmission queue. In order to resolve it, several methods are proposed including a method based on active queue management, our previous method reducing the MAC retransmission limit at low MAC level data rates, and a method stopping sending TCP level data when the queue contains more than a specific number of packets. However, those methods need to be implemented in data sending stations. In this paper, we propose a new method resolving Bufferbloat problem by providing an effect similar to our previous method at a data receiving access point. This decreases the congestion window size in the sending side TCP and can reduce the delay. This paper also shows the results of the performance evaluation by implementing the proposed method in an access point. According to the results, the proposed method decreases the round-trip time (RTT) for low MAC data rates and does not reduce the TCP throughput. It does not give any influences on the TCP throughput for the stations supporting the conventional methods for Bufferbroat problem.

Pages: 8 to 13

Copyright: Copyright (c) IARIA, 2017

Publication date: October 8, 2017

Published in: conference

ISSN: 2326-9286

ISBN: 978-1-61208-596-8

Location: Athens, Greece

Dates: from October 8, 2017 to October 12, 2017

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