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Paper Abstract and Keywords
Presentation 2014-03-07 16:50
Adaptive Frame Collision Reduction Method using Post-IFS for IEEE802.11 Wireless LAN System
Akira Kishida, Masashi Iwabuchi, Toshiyuki Shintaku, Takeshi Onizawa, Tetsu Sakata (NTT) CQ2013-107
Abstract (in Japanese) (See Japanese page) 
(in English) The IEEE 802.11 distributed coordinated function (DCF) adopts carrier sense multiple access with collision avoidance (CSMA/CA) as its medium access control (MAC) protocol. CSMA/CA forces wireless local area network (WLAN) stations (STAs) to wait for the random backoff time prior to each frame transmission attempt. However, the more the number of competing STAs increases, the more the probability of the collision increases. Therefore, in congested situation by WLAN STAs, the performance of WLAN system is significantly degraded as the number of competing STAs increases. This paper proposes a simple but effective method that enables to decrease collision probability without accurate estimation of traffic condition. The proposed method refrains from consecutive transmission and waits for a certain period if previous transmission succeeded. This mechanism can lessen the number of competing STAs and reduce probability of frame collisions even if the proposed method cannot estimate optimal waiting time after a successful transmission. Moreover, we propose an adaptive control method to estimate the optimal waiting time. Computer simulations verify that the proposed method is able to obtain up to over 40% higher system throughput characteristic compared to the case in which the proposed method is not introduced when the number of stations in a network is 50.
Keyword (in Japanese) (See Japanese page) 
(in English) WLAN / CSMA/CA / Dense / IFS / Backoff / Frame Collision / IEEE802.11 / HEW  
Reference Info. IEICE Tech. Rep., vol. 113, no. 471, CQ2013-107, pp. 107-112, March 2014.
Paper # CQ2013-107 
Date of Issue 2014-02-27 (CQ) 
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)
Download PDF CQ2013-107

Conference Information
Committee CQ MVE IE IMQ CEA  
Conference Date 2014-03-06 - 2014-03-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Beppu International Convention Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Five senses media, Food media, Social media, Multimedia, Virtual Environment, Image encoding, Cloud, Mobile, Network, and their quality and reliability,General area 
Paper Information
Registration To CQ 
Conference Code 2014-03-CQ-MVE-IE-IMQ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Adaptive Frame Collision Reduction Method using Post-IFS for IEEE802.11 Wireless LAN System 
Sub Title (in English)  
Keyword(1) WLAN  
Keyword(2) CSMA/CA  
Keyword(3) Dense  
Keyword(4) IFS  
Keyword(5) Backoff  
Keyword(6) Frame Collision  
Keyword(7) IEEE802.11  
Keyword(8) HEW  
1st Author's Name Akira Kishida  
1st Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
2nd Author's Name Masashi Iwabuchi  
2nd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
3rd Author's Name Toshiyuki Shintaku  
3rd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
4th Author's Name Takeshi Onizawa  
4th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
5th Author's Name Tetsu Sakata  
5th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
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Speaker Author-1 
Date Time 2014-03-07 16:50:00 
Presentation Time 25 minutes 
Registration for CQ 
Paper # CQ2013-107 
Volume (vol) vol.113 
Number (no) no.471 
Page pp.107-112 
Date of Issue 2014-02-27 (CQ) 

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