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Paper Abstract and Keywords
Presentation 2014-09-11 10:15
Experimental Evaluation of Frame Collision Reduction Method for IEEE802.11 Wireless LAN System
Akira Kishida, Masashi Iwabuchi, Toshiyuki Shintaku, Takeshi Onizawa, Tetsu Sakata (NTT) CQ2014-42
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. We have proposed a simple but effective method that enables to decrease collision probability. 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. At this point, the length of this waiting period affects the effect of collision reduction and the length of unnecessary overhead time. The effectiveness of the proposed method was measured through experiments. The system throughput characteristic against the length of waiting time and the number of STAs were verified. The experiments verified that the proposed method is able to obtain up to over 20% 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 19.
Keyword (in Japanese) (See Japanese page) 
(in English) IEEE802.11 / CSMA/CA / IFS / HEW / Dense / Collision Reduction / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 209, CQ2014-42, pp. 19-24, Sept. 2014.
Paper # CQ2014-42 
Date of Issue 2014-09-04 (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 CQ2014-42

Conference Information
Committee MoNA CQ  
Conference Date 2014-09-11 - 2014-09-12 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To CQ 
Conference Code 2014-09-MoNA-CQ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Experimental Evaluation of Frame Collision Reduction Method for IEEE802.11 Wireless LAN System 
Sub Title (in English)  
Keyword(1) IEEE802.11  
Keyword(2) CSMA/CA  
Keyword(3) IFS  
Keyword(4) HEW  
Keyword(5) Dense  
Keyword(6) Collision Reduction  
1st Author's Name Akira Kishida  
1st Author's Affiliation Nippon Telegraph and Telephone (NTT)
2nd Author's Name Masashi Iwabuchi  
2nd Author's Affiliation Nippon Telegraph and Telephone (NTT)
3rd Author's Name Toshiyuki Shintaku  
3rd Author's Affiliation Nippon Telegraph and Telephone (NTT)
4th Author's Name Takeshi Onizawa  
4th Author's Affiliation Nippon Telegraph and Telephone (NTT)
5th Author's Name Tetsu Sakata  
5th Author's Affiliation Nippon Telegraph and Telephone (NTT)
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Speaker Author-1 
Date Time 2014-09-11 10:15:00 
Presentation Time 20 minutes 
Registration for CQ 
Paper # CQ2014-42 
Volume (vol) vol.114 
Number (no) no.209 
Page pp.19-24 
Date of Issue 2014-09-04 (CQ) 

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