User-Perceived Reliability of Shared Protection Systems with a Finite Number of Repairers

Ozaki, Hirokazu; Kara, Atsusi; Cheng, Zixue

doi:10.1109/cit.2009.44

Cited by 8 publications

(7 citation statements)

References 10 publications

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“…Therefore, in the cases in which the following condition (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) holds, no user in the low priority group is protected. He/she receives service if and only if his/her own working unit is normal: and :…”

Section: Ijqrm 281mentioning

confidence: 96%

“…Although (3)(4)(5)(6)(7)(8)(9)(10)(11) may not hold if F Li is large, the value of F Li is at most N 2 . Therefore, in the cases in which the following condition (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) holds, no user in the low priority group is protected.…”

Section: Ijqrm 281mentioning

confidence: 97%

“…In (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14), N 2 C N 2 2b 2 N 2 21 C N 2 2b À Á is simplified as follows:…”

Section: Ijqrm 281mentioning

confidence: 99%

“…In the states in which the condition (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) does not hold, we classify the failure cases in terms of the number and the kind of failed unit(s) and count the number of the cases in which his/her service is normal or can be protected.…”

Section: Ijqrm 281mentioning

confidence: 99%

“…Namely, we compute the availability by using the relations, which correspond to (2)(3)(4) in the case of prioritized protection switching. Consider a group N j ð1 , j # kÞ.…”

Section: Ijqrm 281mentioning

confidence: 99%

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User‐perceived availability of priority shared protection systems

Ozaki

Kara

Cheng

2011

International Journal of Quality &Amp; Reliability Management

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PurposeThe purpose of this paper is to derive the user‐perceived availability of M‐for‐N shared protection systems composed of multiple user groups, each with a protection‐switching priority.Design/methodology/approachThe paper assumes a shared protection system with M protection units and N working units. The memoryless state transition diagram viewed from the system administrator, combined with combinatorial analysis of state probabilities on protection switching, yields a generic formula of the availability viewed from an arbitrary end user.FindingsThe numerical examples of availability reveal the effect of prioritized protection switching. It is observed that the total protection capacity is constant regardless of the ways of priority grouping. The shared protection system with multiple protection units enables more flexible availability allocation compared with the case of a single protection unit.Research limitations/implicationsUser‐perceived reliability is still an unexplored research area. Many variations of the system treated in this paper can be applied to various applications.Practical implicationsThe analysis provides useful information for the design and operation of, for example, telecommunication network devices. The analysis is applicable to general shared protection systems that are subject to service level agreement (SLA) involving user‐perceived reliability measures.Originality/valueThis paper establishes the model of the priority shared protection systems for the first time and shows a practical computation method of prioritized user‐perceived availability.

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Section: Ijqrm 281mentioning

confidence: 96%

Section: Ijqrm 281mentioning

confidence: 97%

“…In (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14), N 2 C N 2 2b 2 N 2 21 C N 2 2b À Á is simplified as follows:…”

Section: Ijqrm 281mentioning

confidence: 99%

Section: Ijqrm 281mentioning

confidence: 99%

“…Namely, we compute the availability by using the relations, which correspond to (2)(3)(4) in the case of prioritized protection switching. Consider a group N j ð1 , j # kÞ.…”

Section: Ijqrm 281mentioning

confidence: 99%

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User‐perceived availability of priority shared protection systems

Ozaki

Kara

Cheng

2011

International Journal of Quality &Amp; Reliability Management

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Service‐level assurance in high‐availability multi‐unit systems using the M‐for‐N backup scheme

Ozaki

Kara

Cheng

2011

Quality & Reliability Eng

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In this paper, we investigate service-level assurance in high-availability multi-unit systems using the M-for-N backup scheme. M-for-N shared protection (backup) systems with priority control (i.e. prioritized protection switching and prioritized re-housing of repaired units) can be applied to actual telecommunication devices that are subject to service-level agreement (SLA) involving reliability measures. A priority level is assigned to each end user in such a system and the switching and unit re-housing process is subject to the priority. The main contribution of this paper is to give a practical computation method of the user-perceived availability under the priority control. Our case studies for real telecommunication systems reveal the effect of priority control on the user-perceived availability. Copyright

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Availability of 1-for-2 shared protection systems with general repair-time distributions

Ozaki

2014

Telecommun Syst

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User-Perceived Reliability of Shared Protection Systems with a Finite Number of Repairers

Cited by 8 publications

References 10 publications

User‐perceived availability of priority shared protection systems

User‐perceived availability of priority shared protection systems

Service‐level assurance in high‐availability multi‐unit systems using the M‐for‐N backup scheme

Availability of 1-for-2 shared protection systems with general repair-time distributions

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