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Paper Abstract and Keywords
Presentation 2009-11-12 14:00
A Study of Reliability Measure for Telecommunications Services
Masahiro Hayashi (NTT Corp.) CQ2009-45
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. However, there has been almost no study to verify the appropriateness of it for practical usage. Only existing study, which recently appeared, shows test results of analysis for the relationship between an important business index ‘market share’ & outages occurrences. It indicates the possibility of the market share not be affected by unavailability, which leads us to the new study to improve the reliability measure. Now, this paper first shows a practical approach for the solution of this. As the first step, I formulate the problem as finding the function expressing how the increase of the social loss, which is equivalent to the degradation of the customer satisfaction, is caused by the increases of failure frequency & MTTR. As the second step, I give some hypotheses that the function shall satisfy. Finally, I show an example of function that satisfies the hypotheses.
Key words Reliability, Unavailability, Failure frequency, Social Loss
Keyword (in Japanese) (See Japanese page) 
(in English) Reliability / Unavailabiltiy / Failure Frequency / Social Loss / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 274, CQ2009-45, pp. 39-44, Nov. 2009.
Paper # CQ2009-45 
Date of Issue 2009-11-05 (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)
Download PDF CQ2009-45

Conference Information
Committee CQ NS ICM  
Conference Date 2009-11-12 - 2009-11-13 
Place (in Japanese) (See Japanese page) 
Place (in English) Kanazawa Institute of Technology (Ishikawa) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) NGN and NwGN Architecture, Traffic Measurement and Control, Quality of Service, Network Management, general areas 
Paper Information
Registration To CQ 
Conference Code 2009-11-CQ-NS-ICM 
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 Services 
Sub Title (in English)  
Keyword(1) Reliability  
Keyword(2) Unavailabiltiy  
Keyword(3) Failure Frequency  
Keyword(4) Social Loss  
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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 2009-11-12 14:00:00 
Presentation Time 20 minutes 
Registration for CQ 
Paper # CQ2009-45 
Volume (vol) vol.109 
Number (no) no.274 
Page pp.39-44 
#Pages 6 
Date of Issue 2009-11-05 (CQ) 

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