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Paper Abstract and Keywords
Presentation 2011-03-08 16:35
A Study of Reliability Measure for Telecommunications Networks
Masahiro Hayashi (NTT Corp.) CQ2010-84
Abstract (in Japanese) (See Japanese page) 
(in English) Unavailability, which is obtained by multiplying failure frequency (the mean number of outages per a unit time) & MTTR (the mean time from the occurrence of outage to the repair), is the most popular reliability measure for reliability design and management of telecommunications networks. However, there has been almost no study to verify the appropriateness of it for practical usage. Only existing study, which recently appeared, showed test results of analysis for the relationship between an important business index ‘market share’ & outages occurrences. It indicated the possibility of the market share not being affected by unavailability, which leads us to the new study to improve the reliability measure. However, this existing study has limitation because it is based on only small number of data for outages. Now, this paper shows a more improved study for this problem. I have carried out the questionnaire survey as for the experiences of dissolution of telecommunications services caused by the outages, where this survey has asked the detailed information of how many outages were experienced and how long they continued. The result of survey indicates that the number of users having the experiences of dissolutions is not affected by the multiplication of failure frequency and MTTR, where it indicates more strongly that we should improve reliability measure from unavailability to more appropriate one.
Keyword (in Japanese) (See Japanese page) 
(in English) Reliability / Unavailability / Failure Frequency / Reliability Measure / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 455, CQ2010-84, pp. 99-104, March 2011.
Paper # CQ2010-84 
Date of Issue 2011-02-28 (CQ) 
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 CQ MVE IE  
Conference Date 2011-03-07 - 2011-03-08 
Place (in Japanese) (See Japanese page) 
Place (in English) Yasuragi IOUJIMA 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quality of Five Senses Media, Communication Design, Image Coding, Food Media, General Area 
Paper Information
Registration To CQ 
Conference Code 2011-03-CQ-MVE-IE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study of Reliability Measure for Telecommunications Networks 
Sub Title (in English)  
Keyword(1) Reliability  
Keyword(2) Unavailability  
Keyword(3) Failure Frequency  
Keyword(4) Reliability Measure  
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1st Author's Name Masahiro Hayashi  
1st Author's Affiliation NTT Service Integration Laboratories, NTT Corporation (NTT Corp.)
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Speaker Author-1 
Date Time 2011-03-08 16:35:00 
Presentation Time 25 minutes 
Registration for CQ 
Paper # CQ2010-84 
Volume (vol) vol.110 
Number (no) no.455 
Page pp.99-104 
#Pages 6 
Date of Issue 2011-02-28 (CQ) 

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