Queuing Scheme for Improved Downlink Throughput on WLANs

Authors:
Takefumi Hiraguri;Kengo Nagata;Toshiyuki Ogawa;Takahiro Ueno;Kenya Jin'No;Kentaro Nishimori
Affiliations:
Faculty of Engineering, Nippon Institute of Technology, Miyashiro-machi, Japan 345-8501;NTT Corporation, Yokosuka-shi, Japan 239-0847;Doctor's Program in Graduate School of Electrical Engineering, Nippon Institute of Technology, Miyashiro-machi, Japan 345-8501;Faculty of Engineering, Nippon Institute of Technology, Miyashiro-machi, Japan 345-8501;Faculty of Engineering, Nippon Institute of Technology, Miyashiro-machi, Japan 345-8501;Faculty of Engineering, Niigata University, Niigata-shi, Japan 950-2102
Venue:
Wireless Personal Communications: An International Journal
Year:
2013

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Abstract

A transmission queuing scheme is described that increases downlink throughput on wireless local area networks (WLANs) while also increasing the total throughput. When the amount of uplink traffic increases on a WLAN, the carrier sense multiple access with collision avoidance (CSMA/CA) protocol, which is the prescribed scheme for IEEE 802.11 WLAN channel access, may substantially reduce the rate of downlink data frame transmission. This results in severe throughput degradation for mobile stations with downlink traffic. The proposed scheme comprises a transmission control function based on consecutive transmission, as described in the IEEE 802.11e standard, and a dynamic queue prioritization algorithm. Simulation results demonstrate that the proposed scheme increases the maximum total throughput for uplink and downlink traffic by 17% compared with the conventional distributed coordination function (DCF) scheme and that it reduces the difference between uplink and downlink throughput. In an environment where transmission errors occur, the difference in throughput is reduced by about 50% compared with the conventional schemes.