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Paper Abstract and Keywords
Presentation 2007-01-25 11:40
Performance evaluation of CSMA/CA assuming carrier detection probability in wireless ad hoc networks
Masahiro Fujii, Koji Yamamoto, Hidekazu Murata, Susumu Yoshida (Kyoto Univ.) SIP2006-146 RCS2006-204
Abstract (in Japanese) (See Japanese page) 
(in English) In usual performance evaluations of
Carrier Sense Multiple Access with Collision Avoidance
(CSMA/CA),
probabilities of carrier detection and data reception
are modeled to be a discontinuous function changing
from $0\%$ to $100\%$ at a certain transmitter-receiver distance.
In real systems, however, these probabilities change
continuously against the receiver-transmitter distance
even with the same average received CNR (Carrier-to-Noise Ratio) or CINR
(Carrier-to-Interference plus Noise Ratio) due to the thermal noise or fading.
In this paper, we have studied the throughput of wireless ad hoc networks
taking account of the continuous carrier detection probability and the data
reception probability.
Analytical results indicate that,
considering the above mentioned
continuous probabilities,
more than one problem such as hidden terminal or exposed terminal
arise and decrease the system throughput,
whereas only one problem decreases it in the analysis without
assuming these probabilities.
The analytical results are verified by a comparison of
results from computer simulations assuming IEEE 802.11a protocol.
Through network simulations,
we also show that a routing algorithm can decrease network delay
by taking the quality of wireless links into account
especially when these continuous probabilities are assumed.
Keyword (in Japanese) (See Japanese page) 
(in English) ad hoc networks / CSMA/CA / MAC / hidden terminals / exposed terminals / routing / /  
Reference Info. IEICE Tech. Rep., vol. 106, no. 479, RCS2006-204, pp. 55-60, Jan. 2007.
Paper # RCS2006-204 
Date of Issue 2007-01-18 (SIP, RCS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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 SIP2006-146 RCS2006-204

Conference Information
Committee RCS SIP  
Conference Date 2007-01-24 - 2007-01-26 
Place (in Japanese) (See Japanese page) 
Place (in English) NICT Okinawa 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2007-01-RCS-SIP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance evaluation of CSMA/CA assuming carrier detection probability in wireless ad hoc networks 
Sub Title (in English)  
Keyword(1) ad hoc networks  
Keyword(2) CSMA/CA  
Keyword(3) MAC  
Keyword(4) hidden terminals  
Keyword(5) exposed terminals  
Keyword(6) routing  
Keyword(7)  
Keyword(8)  
1st Author's Name Masahiro Fujii  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
2nd Author's Name Koji Yamamoto  
2nd Author's Affiliation Kyoto University (Kyoto Univ.)
3rd Author's Name Hidekazu Murata  
3rd Author's Affiliation Kyoto University (Kyoto Univ.)
4th Author's Name Susumu Yoshida  
4th Author's Affiliation Kyoto University (Kyoto Univ.)
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Speaker Author-1 
Date Time 2007-01-25 11:40:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # SIP2006-146, RCS2006-204 
Volume (vol) vol.106 
Number (no) no.476(SIP), no.479(RCS) 
Page pp.55-60 
#Pages 6 
Date of Issue 2007-01-18 (SIP, RCS) 

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