Availability-Aware Provisioning Strategies for Differentiated Protection Services in Wavelength-Convertible WDM Mesh Networks

Zhang, Jing; Zhu, Kan; Zang, Hui; Matloff, Norman; Mukherjee, Biswanath

doi:10.1109/tnet.2007.896232

Cited by 94 publications

(62 citation statements)

References 22 publications

(30 reference statements)

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“…We compute the MTTFF (Mean Time to First Failure) M M:N after the service restoration by the above recurrence formulas, the conservation law (9), and the addition of (13) if the initial state is given.…”

Section: The Mttf Computationmentioning

confidence: 99%

“…As they derived MTTF based on such inaccurate unavailability, they did not obtain correct solutions. There are several related works that analyzed the path availability in WDM networks [9], [10]. However, the maintenance manner of geographically fixed optical links considered in the analysis of WDM networks is different from that of the devices including routinely replaceable units.…”

Section: Introductionmentioning

confidence: 99%

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User-Perceived Reliability of M-for-N (M:N) Shared Protection Systems

Ozaki¹,

Kara²,

Cheng

2009

IEICE Trans. Inf. & Syst.

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SUMMARYIn this paper we investigate the reliability of general type shared protection systems i.e. M for N (M:N) that can typically be applied to various telecommunication network devices. We focus on the reliability that is perceived by an end user of one of N units. We assume that any failed unit is instantly replaced by one of the M units (if available). We describe the effectiveness of such a protection system in a quantitative manner. The mathematical analysis gives the closed-form solution of the availability, the recursive computing algorithm of the MTTFF (Mean Time to First Failure) and the MTTF (Mean Time to Failure) perceived by an arbitrary end user. We also show that, under a certain condition, the probability distribution of TTFF (Time to First Failure) can be approximated by a simple exponential distribution. The analysis provides useful information for the analysis and the design of not only the telecommunication network devices but also other general shared protection systems that are subject to service level agreements (SLA) involving user-perceived reliability measures.

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Section: The Mttf Computationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

User-Perceived Reliability of M-for-N (M:N) Shared Protection Systems

Ozaki¹,

Kara²,

Cheng

2009

IEICE Trans. Inf. & Syst.

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“…The most common scheme in backbone networks today is 1 + 1 guaranteed path protection [7], which provides an edgedisjoint backup path for each working path, and guarantees the full demand to be available at all times after any single link failure. There has also been a growing body of literature for backup provisioning to meet availability guarantees [8][9][10][11][12][13][14]. In all of these, primary and backup flows are allocated such that the connection is disrupted for at most a specified fraction of time or probability.…”

Section: Introductionmentioning

confidence: 99%

Network protection with multiple availability guarantees

Kuperman

Modiano

Narula-Tam

2012

2012 IEEE International Conference on Communications (ICC)

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Abstract-We develop a novel network protection scheme that provides guarantees on both the fraction of time a flow has full connectivity, as well as a quantifiable minimum grade of service during downtimes. In particular, a flow can be below the full demand for at most a maximum fraction of time; then, it must still support at least a fraction q of the full demand. This is in contrast to current protection schemes that offer either availabilityguarantees with no bandwidth guarantees during the downtime, or full protection schemes that offer 100% availability after a single link failure. We develop algorithms that provide multiple availability guarantees and show that significant capacity savings can be achieved as compared to full protection. If a connection is allowed to drop to 50% of its bandwidth for 1 out of every 20 failures, then a 24% reduction in spare capacity can be achieved over traditional full protection schemes. In addition, for the case of q = 0, corresponding to the standard availability constraint, an optimal pseudo-polynomial time algorithm is presented.

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“…The SLA is a contract between the optical network operator and a customer guaranteeing certain communication service. A SLA violation may cause a payment of a refund to the harmed customer according to the contract [2][3][4]. The higher the priority of the optical connection required, the higher the availability should be [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the study of connection availabilities has become a practical issue, especially for services with high availability requirements. Many analytical models have been proposed for evaluating the connection availability in WDM networks under single link failure assumption [3,[7][8][9]. Several analytical models have addressed the dual link failure problem [9][10][11][12][13], but few have been reported for modeling the availability under multiple link failure scenario [14,15].…”

Section: Introductionmentioning

confidence: 99%

Availability analysis under multiple link failures in WDM networks with shared-link connections

Azim

Kabir

2011

Photon Netw Commun

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In optical Wavelength Division Multiplexing (WDM) networks, different protection schemes have been proposed in the literature, namely, dedicated protection and shared protection. Shared protection techniques significantly reduce the required spare capacity by providing the same level of availability as dedicated protection. However, current mission critical applications (which heavily depend on the availability of communication resources) require connection availability in the order of 99.999% or higher, which corresponds to a downtime of almost 5 min a year on the average. Therefore, in order to satisfy a connection serviceavailability requirement defined by the users Service Level Agreement in a cost-effective and resource-efficient way, network operators need a systematic mechanism to evaluate the network availability under multiple failure scenario to ensure that current network configuration can meet the required availability degree; otherwise, a network upgrade is required. Unfortunately, under multiple failure scenario, traditional availability analysis techniques based on reliability block diagrams are not suitable for survivable networks with shared spare capacity. Therefore, a new concept is proposed to facilitate the calculations of network availability. In this paper, we propose an analytical model for evaluating the availability of a WDM network with shared-link connections under multiple link failures. The analytical model is also verified using Monte Carlo simulation. The proposed model significantly contributes to the related areas by providing network operators with a quantitative tool to evaluate the system availability and, thus, the expected survivability degree of WDM optical networks with shared connections under multiple link failures.

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Availability-Aware Provisioning Strategies for Differentiated Protection Services in Wavelength-Convertible WDM Mesh Networks

Cited by 94 publications

References 22 publications

User-Perceived Reliability of M-for-N (M:N) Shared Protection Systems

User-Perceived Reliability of M-for-N (M:N) Shared Protection Systems

Network protection with multiple availability guarantees

Availability analysis under multiple link failures in WDM networks with shared-link connections

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