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Paper Abstract and Keywords
Presentation 2008-10-24 10:35
Evaluation of the Interference Avoidance Method between RFID Systems with Considering Interference Zone Radius Distance between Channels
Akira Uryu, Yohtaro Umeda, Osamu Takyu (Tokyo Univ. of Science) USN2008-56
Abstract (in Japanese) (See Japanese page) 
(in English) In a long range RFID system, since the communication distance is several meters longer than that in conventional RFID system, the method of avoiding the interference among systems is necessary. Various methods for avoiding the interference, such as carrier sense method, mirror subcarrier one and listen before talk (LBT) one, have been considered so far, but when there are a lot of readers and tags in the small area, these methods cannot sufficiently suppress the interferences between the reader and tag. Interference zones can be estimated by the location information of reader and thus the frequency and time channel can be assigned to each reader in order to avoid the interference. In addition, recently, the dependence between the interference geometric distance among the readers and the frequency distance between channels has been clarified. In this report, we consider the interference avoidance method of assigning the frequency and time channels to reader with using the information of the reader position. From the computer simulation, we show that the number of required time slots for avoiding the interference can be reduced and the frequency utilization efficiency can be increased when the dependence between the interference geometrical distance between readers and the frequency distance between channels is taken into account.
Keyword (in Japanese) (See Japanese page) 
(in English) RFID / UHF / Interference between Systems / / / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 252, USN2008-56, pp. 105-110, Oct. 2008.
Paper # USN2008-56 
Date of Issue 2008-10-15 (USN) 
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)
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Conference Information
Committee SR RCS USN AN  
Conference Date 2008-10-22 - 2008-10-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa industry support center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless discributed network special session and general session 
Paper Information
Registration To USN 
Conference Code 2008-10-SR-RCS-USN-AN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Evaluation of the Interference Avoidance Method between RFID Systems with Considering Interference Zone Radius Distance between Channels 
Sub Title (in English)  
Keyword(1) RFID  
Keyword(2) UHF  
Keyword(3) Interference between Systems  
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Keyword(5)  
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1st Author's Name Akira Uryu  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Yohtaro Umeda  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
3rd Author's Name Osamu Takyu  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Speaker Author-1 
Date Time 2008-10-24 10:35:00 
Presentation Time 20 minutes 
Registration for USN 
Paper # USN2008-56 
Volume (vol) vol.108 
Number (no) no.252 
Page pp.105-110 
#Pages 6 
Date of Issue 2008-10-15 (USN) 

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