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Paper Abstract and Keywords
Presentation 2011-12-16 11:00
Realizing Fair Sharing of WLAN Channels in the Presence of Legacy Devices
Suhua Tang, Akio Hasegawa, Tatsuo Shibata, Masayoshi Ohashi (ATR) RCS2011-253
Abstract (in Japanese) (See Japanese page) 
(in English) IEEE 802.11n is being widely deployed since its finalization. But legacy WLAN devices running 802.11g or even 802.11b will co-exist for a long time and share the same 2.4GHz ISM band. Although 802.11n is designed to be backward compatible with 802.11b/g, there are few evaluation results. In addition, frame aggregation, used by 802.11n devices to reduce protocol overhead, may affect channel usage of legacy devices. In this paper, we study the coexistence of 802.11g/n devices, and aim to realize fair sharing of channels. We study two aspects: (i) Intra-cell channel access control. Contention window of 802.11n devices is adjusted based on frame aggregation size so that each node gets a fair share of the channel in terms of air-time. (ii) Association control. Nodes are properly assigned to APs running on different channels to ensure fair share of channels across cells. As a result, each node gets the same air-time ratio, during which a new node achieves higher throughput while a legacy node will not be starved. Theoretical analysis and simulation results confirm that the proposed method realizes proportional fair scheduling.
Keyword (in Japanese) (See Japanese page) 
(in English) Co-existence / 802.11n / legacy device / fair scheduling / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 345, RCS2011-253, pp. 123-128, Dec. 2011.
Paper # RCS2011-253 
Date of Issue 2011-12-08 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee NS RCS  
Conference Date 2011-12-15 - 2011-12-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Yamaguchi University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Ad-hoc Network, Ubiquitous Network, Wireless Communication, security, Multi-Access Network 
Paper Information
Registration To RCS 
Conference Code 2011-12-NS-RCS 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Realizing Fair Sharing of WLAN Channels in the Presence of Legacy Devices 
Sub Title (in English)  
Keyword(1) Co-existence  
Keyword(2) 802.11n  
Keyword(3) legacy device  
Keyword(4) fair scheduling  
1st Author's Name Suhua Tang  
1st Author's Affiliation ATR (ATR)
2nd Author's Name Akio Hasegawa  
2nd Author's Affiliation ATR (ATR)
3rd Author's Name Tatsuo Shibata  
3rd Author's Affiliation ATR (ATR)
4th Author's Name Masayoshi Ohashi  
4th Author's Affiliation ATR (ATR)
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Date Time 2011-12-16 11:00:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2011-253 
Volume (vol) IEICE-111 
Number (no) no.345 
Page pp.123-128 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2011-12-08 

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