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Paper Abstract and Keywords
Presentation 2011-10-28 13:15
A CSMA/CA Based MAC Protocol to Improve TCP Performance in Multi-hop Cognitive Network
Takamasa Kimura, Takeo Fujii (UEC) SR2011-75
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we have propose a novel MAC protocol to improve the TCP(Transmission Control Protocol) performance in a cognitive multi-hop mobile ad hoc network (CR MANET: Cognitive Radio, Mobile Ad hoc Network) with wireless LAN system. In particular, the legacy wireless LAN (PU: Primary User) shares the spectrum for other users (SU: Secondary User) of MANET to increase the spectrum efficiency. In order to realize such spectrum sharing system, the SU should protect primary system during data sending. In general, the TCP performance of SU dramatically decreases in CR MANET environment. In particular, the congestion control mechanism of TCP miss-detects much congestion due to packet loss and time out even if congestion is not appeared. As a result, TCP performance degrades because TCP of transmitter over-decreases a amount of sending data. In this paper, in order to resolve such problem, we propose an adaptive contention widow size control method to correspond with TCP behavior. In the proposed method, the contention window size is controlled according to the TCP cwnd (congestion window) size at a MAC layer of each secondary sender. The performance of the proposed method is evaluated by using computer simulations and we confirm the effectiveness of the proposed method.
Keyword (in Japanese) (See Japanese page) 
(in English) Cognitive Radio / MANET / MAC protocol / TCP / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 261, SR2011-75, pp. 193-198, Oct. 2011.
Paper # SR2011-75 
Date of Issue 2011-10-19 (SR) 
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 RCS AN SR USN  
Conference Date 2011-10-26 - 2011-10-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Sophia Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Distributed Networks, etc. 
Paper Information
Registration To SR 
Conference Code 2011-10-RCS-AN-SR-USN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A CSMA/CA Based MAC Protocol to Improve TCP Performance in Multi-hop Cognitive Network 
Sub Title (in English)  
Keyword(1) Cognitive Radio  
Keyword(2) MANET  
Keyword(3) MAC protocol  
Keyword(4) TCP  
1st Author's Name Takamasa Kimura  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Takeo Fujii  
2nd Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2011-10-28 13:15:00 
Presentation Time 25 minutes 
Registration for SR 
Paper # SR2011-75 
Volume (vol) vol.111 
Number (no) no.261 
Page pp.193-198 
Date of Issue 2011-10-19 (SR) 

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