Multi-Stage DCF-Based Channel Access Scheme for Throughput Enhancement of OFDMA WLAN Systems

Shinichi MIYAMOTO; Naoya IKESHITA; Seiichi SAMPEI; Wenjie JIANG

doi:10.1587/transcom.E97.B.2230

Multi-Stage DCF-Based Channel Access Scheme for Throughput Enhancement of OFDMA WLAN Systems

Shinichi MIYAMOTO, Naoya IKESHITA, Seiichi SAMPEI, Wenjie JIANG

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To enhance the throughput of wireless local area networks (WLANs) by efficiently utilizing the radio resource, a distributed coordination function-based (DCF-based) orthogonal frequency division multiple access (OFDMA) WLAN system has been proposed. In the system, since each OFDMA sub-channel is assigned to the associated station with the highest channel gain, the transmission rate of DATA frames can be enhanced thanks to multi-user diversity. However, the optimum allocation of OFDMA sub-channels requires the estimation of channel state information (CSI) of all associated stations, and this incurs excessive signaling overhead. As the number of associated stations increases, the signaling overhead severely degrades the throughput of DCF-based OFDMA WLAN. To reduce the signaling overhead while obtaining a sufficient diversity gain, this paper proposes a channel access scheme that performs multiple DCF-based channel access. The key idea of the proposed scheme is to introduce additional DCF-based prioritized access along with the traditional DCF-based random access. In the additional DCF-based prioritized access, by dynamically adjusting contention window size according to the CSI of each station, only the stations with better channel state inform their CSI to the access point (AP), and the signaling overhead can be reduced while maintaining high multi-user diversity gain. Numerical results confirm that the proposed channel access scheme enhances the throughput of OFDMA WLAN.

Publication: IEICE TRANSACTIONS on Communications Vol.E97-B No.10 pp.2230-2242

Publication Date: 2014/10/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.E97.B.2230

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

Authors

Shinichi MIYAMOTO
  Osaka University
Naoya IKESHITA
  Osaka University
Seiichi SAMPEI
  Osaka University
Wenjie JIANG
  NTT Corporation

Keyword

CSMA/CA, DCF, OFDMA, prioritized channel access, signaling overhead

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Shinichi MIYAMOTO, Naoya IKESHITA, Seiichi SAMPEI, Wenjie JIANG, "Multi-Stage DCF-Based Channel Access Scheme for Throughput Enhancement of OFDMA WLAN Systems" in IEICE TRANSACTIONS on Communications, vol. E97-B, no. 10, pp. 2230-2242, October 2014, doi: 10.1587/transcom.E97.B.2230.
Abstract: To enhance the throughput of wireless local area networks (WLANs) by efficiently utilizing the radio resource, a distributed coordination function-based (DCF-based) orthogonal frequency division multiple access (OFDMA) WLAN system has been proposed. In the system, since each OFDMA sub-channel is assigned to the associated station with the highest channel gain, the transmission rate of DATA frames can be enhanced thanks to multi-user diversity. However, the optimum allocation of OFDMA sub-channels requires the estimation of channel state information (CSI) of all associated stations, and this incurs excessive signaling overhead. As the number of associated stations increases, the signaling overhead severely degrades the throughput of DCF-based OFDMA WLAN. To reduce the signaling overhead while obtaining a sufficient diversity gain, this paper proposes a channel access scheme that performs multiple DCF-based channel access. The key idea of the proposed scheme is to introduce additional DCF-based prioritized access along with the traditional DCF-based random access. In the additional DCF-based prioritized access, by dynamically adjusting contention window size according to the CSI of each station, only the stations with better channel state inform their CSI to the access point (AP), and the signaling overhead can be reduced while maintaining high multi-user diversity gain. Numerical results confirm that the proposed channel access scheme enhances the throughput of OFDMA WLAN.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E97.B.2230/_p

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@ARTICLE{e97-b_10_2230,
author={Shinichi MIYAMOTO, Naoya IKESHITA, Seiichi SAMPEI, Wenjie JIANG, },
journal={IEICE TRANSACTIONS on Communications},
title={Multi-Stage DCF-Based Channel Access Scheme for Throughput Enhancement of OFDMA WLAN Systems},
year={2014},
volume={E97-B},
number={10},
pages={2230-2242},
abstract={To enhance the throughput of wireless local area networks (WLANs) by efficiently utilizing the radio resource, a distributed coordination function-based (DCF-based) orthogonal frequency division multiple access (OFDMA) WLAN system has been proposed. In the system, since each OFDMA sub-channel is assigned to the associated station with the highest channel gain, the transmission rate of DATA frames can be enhanced thanks to multi-user diversity. However, the optimum allocation of OFDMA sub-channels requires the estimation of channel state information (CSI) of all associated stations, and this incurs excessive signaling overhead. As the number of associated stations increases, the signaling overhead severely degrades the throughput of DCF-based OFDMA WLAN. To reduce the signaling overhead while obtaining a sufficient diversity gain, this paper proposes a channel access scheme that performs multiple DCF-based channel access. The key idea of the proposed scheme is to introduce additional DCF-based prioritized access along with the traditional DCF-based random access. In the additional DCF-based prioritized access, by dynamically adjusting contention window size according to the CSI of each station, only the stations with better channel state inform their CSI to the access point (AP), and the signaling overhead can be reduced while maintaining high multi-user diversity gain. Numerical results confirm that the proposed channel access scheme enhances the throughput of OFDMA WLAN.},
keywords={},
doi={10.1587/transcom.E97.B.2230},
ISSN={1745-1345},
month={October},}

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TY - JOUR
TI - Multi-Stage DCF-Based Channel Access Scheme for Throughput Enhancement of OFDMA WLAN Systems
T2 - IEICE TRANSACTIONS on Communications
SP - 2230
EP - 2242
AU - Shinichi MIYAMOTO
AU - Naoya IKESHITA
AU - Seiichi SAMPEI
AU - Wenjie JIANG
PY - 2014
DO - 10.1587/transcom.E97.B.2230
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E97-B
IS - 10
JA - IEICE TRANSACTIONS on Communications
Y1 - October 2014
AB - To enhance the throughput of wireless local area networks (WLANs) by efficiently utilizing the radio resource, a distributed coordination function-based (DCF-based) orthogonal frequency division multiple access (OFDMA) WLAN system has been proposed. In the system, since each OFDMA sub-channel is assigned to the associated station with the highest channel gain, the transmission rate of DATA frames can be enhanced thanks to multi-user diversity. However, the optimum allocation of OFDMA sub-channels requires the estimation of channel state information (CSI) of all associated stations, and this incurs excessive signaling overhead. As the number of associated stations increases, the signaling overhead severely degrades the throughput of DCF-based OFDMA WLAN. To reduce the signaling overhead while obtaining a sufficient diversity gain, this paper proposes a channel access scheme that performs multiple DCF-based channel access. The key idea of the proposed scheme is to introduce additional DCF-based prioritized access along with the traditional DCF-based random access. In the additional DCF-based prioritized access, by dynamically adjusting contention window size according to the CSI of each station, only the stations with better channel state inform their CSI to the access point (AP), and the signaling overhead can be reduced while maintaining high multi-user diversity gain. Numerical results confirm that the proposed channel access scheme enhances the throughput of OFDMA WLAN.
ER -