Presentation 2010-09-10
Improving Transmission Quality for IEEE 802.11e Wireless LAN Access Networks
Oyunchimeg SHAGDAR, Kengo SAKAI, Hiroyuki YOMO, Akio HASEGAWA, Tetsuo UEDA, Ryu MIURA, Sadao OBANA,
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Abstract(in English) Widespread of wireless LAN enables users enjoy ubiquitous Internet access not only for the traditional best-effort type applications but also real-time applications such as voice. To support real timme applications in Wireless LAN, the IEEE 802.11e enhances the legacy 802.11 MAC protocol with service differentiation and it is now installed in off-the-shelf wireless LAN cards. However, because the channel access method of IEEE 802.11e, EDCA (Enhanced Distributed Channel Access), is based on the Distributed Coordination Function (DCF) of the legacy 802.11 MAC, it carries over the issues of the DCF, such as channel underutilization and uplink and downlink unfairness issues. In this paper, we target the latter issue, which is especially problematic for bidirectional applications such as voice, and propose a scheme that mitigates the unfairness problem by enabling AP adaptively adjust TXOP (Transmission Opportunity). The proposed scheme is investigated by simulations and testbed experiments. Our simulation results show that the proposed scheme provides fair communication performance for uplink and downlink traffic. The experimental results show that the proposed scheme can be implemented in the current hardware and network stack and can provide a promising system performance.
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Keyword(in English) wireless LAN / IEEE 802.11e / unfairness problem / TXOP
Paper # MoMuC2010-34
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Committee MoMuC
Conference Date 2010/9/2(1days)
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Registration To Mobile Multimedia Communications(MoMuC)
Language ENG
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Improving Transmission Quality for IEEE 802.11e Wireless LAN Access Networks
Sub Title (in English)
Keyword(1) wireless LAN
Keyword(2) IEEE 802.11e
Keyword(3) unfairness problem
Keyword(4) TXOP
1st Author's Name Oyunchimeg SHAGDAR
1st Author's Affiliation ATR Adaptive Communications Research Laboratories()
2nd Author's Name Kengo SAKAI
2nd Author's Affiliation ATR Adaptive Communications Research Laboratories
3rd Author's Name Hiroyuki YOMO
3rd Author's Affiliation ATR Adaptive Communications Research Laboratories
4th Author's Name Akio HASEGAWA
4th Author's Affiliation ATR Adaptive Communications Research Laboratories
5th Author's Name Tetsuo UEDA
5th Author's Affiliation ATR Adaptive Communications Research Laboratories
6th Author's Name Ryu MIURA
6th Author's Affiliation ATR Adaptive Communications Research Laboratories
7th Author's Name Sadao OBANA
7th Author's Affiliation ATR Adaptive Communications Research Laboratories
Date 2010-09-10
Paper # MoMuC2010-34
Volume (vol) vol.110
Number (no) 199
Page pp.pp.-
#Pages 5
Date of Issue