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Paper Abstract and Keywords
Presentation 2012-01-27 14:00
Coexistence of TVWS Secondary Networks via Optimum and Sub-optimum Power Selection Strategies
Yohannes D. Alemseged, Gabriel Porto Villardi, Chen Sun, Ha-Nguyen Tran, Hiroshi Harada (NICT) SR2011-98
Abstract (in Japanese) (See Japanese page) 
(in English) As a recent developments, radio regulatory bodies are introducing flexible use of spectrum such as allowing the use of temporarily unoccupied VHF and UHF bands also known as television white spaces (TVWS) on unlicensed basis. The devices exploiting such opportunity, hereafter called secondary devices, access available TVWS without being required to obtain license. However such devices are required to meeting the regulatory requirements to avoid harmful interference to the incumbent services. In the occurrence of multiple operational secondary devices in the same vicinity, unhealthy competition to occupy the same spectrum would be inevitable. In the worst scenario, a single VHF or UHF channel has to be shared among coexisting networks. Without coexistence mechanism in place, users might simply increase their transmit power in an attempt to overcome the surrounding interference which is not an effective way of circumventing the problem. We propose a distributed coexistence algorithm (DCA) to be implemented by TVWS devices/networks located in close vicinity. The TVWS devices/Networks cooperate by sharing operational parameters in order to implement self enforcing coexistence algorithms. Through the knowledge of the exchanged parameters, devices dynamically select the the appropriate transmit power that minimizes the mutual interference among the cooperating networks. We demonstrate by simulation that choosing of optimum transmit power vector, in which each element of the vector corresponds to the optimum transmit power of particular network, ensures minimum outage occurrence that any of the cooperating networks experience link quality below a specified threshold. We also explore other practical approaches such as divide-and-conquer and simulated annealing, that would result in sub-optimal solutions to implement the DCA.
Keyword (in Japanese) (See Japanese page) 
(in English) Television white space (TVWS) / TVWS device/network / coexistence / distributed coexistence algorithm / transmit power control / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 417, SR2011-98, pp. 119-124, Jan. 2012.
Paper # SR2011-98 
Date of Issue 2012-01-19 (SR) 
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 SR2011-98

Conference Information
Committee SR  
Conference Date 2012-01-26 - 2012-01-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Kagoshima 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Cognitive Radio Network, Cross Layer Technology 
Paper Information
Registration To SR 
Conference Code 2012-01-SR 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Coexistence of TVWS Secondary Networks via Optimum and Sub-optimum Power Selection Strategies 
Sub Title (in English)  
Keyword(1) Television white space (TVWS)  
Keyword(2) TVWS device/network  
Keyword(3) coexistence  
Keyword(4) distributed coexistence algorithm  
Keyword(5) transmit power control  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Yohannes D. Alemseged  
1st Author's Affiliation National Institute of Information and Communications Technology (NICT)
2nd Author's Name Gabriel Porto Villardi  
2nd Author's Affiliation National Institute of Information and Communications Technology (NICT)
3rd Author's Name Chen Sun  
3rd Author's Affiliation National Institute of Information and Communications Technology (NICT)
4th Author's Name Ha-Nguyen Tran  
4th Author's Affiliation National Institute of Information and Communications Technology (NICT)
5th Author's Name Hiroshi Harada  
5th Author's Affiliation National Institute of Information and Communications Technology (NICT)
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Speaker Author-1 
Date Time 2012-01-27 14:00:00 
Presentation Time 25 minutes 
Registration for SR 
Paper # SR2011-98 
Volume (vol) vol.111 
Number (no) no.417 
Page pp.119-124 
#Pages 6 
Date of Issue 2012-01-19 (SR) 

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