A two-moment performance analysis of optical burst switched networks with shared fibre delay lines in a feedback configuration

Tafani, Daniele; McArdle, Conor; Barry, Liam P.

doi:10.1016/j.osn.2012.03.001

Cited by 7 publications

(7 citation statements)

References 27 publications

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“…For a cost-efficient packet switch architecture, a share-per-node optical FB butter configuration has been proposed and has been extensively investigated [8,[14][15], where FDLs are shared among the output ports of a node in a feedback configuration. The shared-per-node configuration utilizes the output buffering strategy in the same way as a shared-per-port optical buffer configuration does, where each output port has its own dedicated buffer.…”

Section: Introductionmentioning

confidence: 99%

“…Generally speaking, for the FB buffers, there has been insufficient theoretical investigation of both blocking probabilities and delays. Simulations [4,[6][7][8], an approximation for the FB buffer with one FB loop [6], and numerical iterations [12,[14][15] have been performed, but the characteristics of the multi-re-circulation-loop FB buffers with general packet-length distributions have not yet been clarified. Basically, in queueing networks, the existence of feedback loops makes the stochastic processes more complex and difficult to solve [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Blocking Probability Simulations for FDL Feedback Optical Buffers

Murakami¹

2016

AJNC

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Asynchronous optical packet switching seems to a suitable transport technology for the next-generation Internet due to the variable lengths of IP packets. Optical buffers in the output port are an integral part of solving contention by exploiting the time domain. Fiber delay lines (FDLs) are a well-known technique for achieving optical buffers, and various optical buffer architectures using FDLs have been proposed. These are generally classified into two types of structure: feed-forward (FF) or feedback (FB). In the FF buffers, optical packets are delayed at the output ports by passing through step-increasing-length multiple FDLs to avoid contentions, and in the FB buffers, optical packets are delayed by being fed back in re-circulating loop FDLs to avoid contentions. We report the detailed characteristics of optical FB buffers with the Post-Reservation (PostRes) policy and clarify the superiority of the FB buffers through simulations. For comparison, we also show the characteristics of FBSI (FB with step-increasing-length FDLs) and FF buffers. We found that 1) the blocking probabilities in the FB buffer were about 10-2 lower than those in the FF buffer and 2) the blocking probabilities for the deterministic case in the FB buffer sharply dropped at 1.0 D = , where the packet length was equal to the FDL loop length. We carried out 10 8 packet simulations. The results can be applied to the design of WDM optical packet switches and networks with the maximum throughput.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Blocking Probability Simulations for FDL Feedback Optical Buffers

Murakami¹

2016

AJNC

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“…However, variable-length FDLs and recirculations are not employed in this work. This method is then used in [22] to derive the end-to-end burst blocking probability in a network of OPRs using a two-moment-based approximative scheme. On the other hand, we use Markov Modulated Poisson Process (MMPP)-based traffic models based on [23] (also used in [20]) for overflow traffic modeling that allows one to match three moments in addition to the DC value of the power spectrum of the overflow traffic.…”

Section: Introductionmentioning

confidence: 99%

Dimensioning shared-per-node recirculating fiber delay line buffers in an optical packet switch

Akar¹,

Gunalay²

2013

Performance Evaluation

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Optical buffering based on fiber delay lines (FDLs) has been proposed as a means for contention resolution in an optical packet switch. In this article, we propose a queuing model for feedback-type shared-per-node recirculating FDL optical buffers in asynchronous optical switching nodes. In this model, optical packets are allowed to recirculate over FDLs as long as the total number of recirculations is less than a pre-determined limit to meet signal loss requirements. Markov Modulated Poisson Process (MMPP)-based overflow traffic models and fixed-point iterations are employed to provide an approximate analysis procedure to obtain blocking probabilities as a function of various buffer parameters in the system when the packet arrival process at the optical switch is Poisson. The proposed algorithm is numerically efficient and accurate especially in a certain regime identified with relatively long and variably-sized FDLs, making it possible to dimension optical buffers in next-generation optical packet switching systems. © 2013 Elsevier B.V. All rights reserved

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“…Meanwhile, the authors in [15,16] were concerned with OBS networks in which the variability of the burst length would result in occupying the same wavelength on two adjacent links simultaneously. Finally, [17] aimed at evaluating the burst loss probability in an OBS network that adopts FDLs, implemented in a share-per-node architecture, as a contention resolution technique. In particular, the paper proposed replacing the conventional Poisson arrivals model by a two moment traffic model.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of an Optical Burst Switched Core Node With Generalized Arrivals and Partial Wavelength Conversion Capability

Morsy-Osman

Sowailem

El-Rahman

et al. 2012

J. Opt. Commun. Netw.

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Many of the burst assembly algorithms employed in optical burst switching (OBS) networks preserve the IP traffic self-similarity property in the burst traffic. We introduce a mathematical model for performance evaluation of an OBS core node employing either no, a partial or a full wavelength conversion strategy. The model assumes long-range dependent (LRD) traffic arrivals to the OBS intermediate node whose inter-arrival times are accurately modeled by a Pareto distribution, whereas exponential holding times are assumed. In our proposed model, each output port in the node is modeled as a GI/M/w/w queue with partial server accessibility. An imbedded Markov chain approach is used to derive the limiting state probability distribution for the number of bursts currently served by an output port as seen by arriving bursts. Next, the average burst loss probability is evaluated from steady-state occupancy probabilities. In addition, the results of our mathematical model are validated via simulation. Furthermore, the results of the model are compared with those when assuming short-range dependent Poisson arrivals. Comparison shows that traditional Poisson traffic models yield over-optimistic performance measures compared to the LRD Pareto traffic models, especially for light traffic scenarios. Furthermore, we study the impact of varying different traffic parameters, such as the average arrival rate and the Hurst parameter, on the burst loss probability. Finally, the impact of varying the wavelength conversion capability on the burst loss probability is studied, where we compare two strategies for contention resolution: adding new channels (wavelengths) or adding wavelength converters, while taking the cost into consideration.

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A two-moment performance analysis of optical burst switched networks with shared fibre delay lines in a feedback configuration

Cited by 7 publications

References 27 publications

Blocking Probability Simulations for FDL Feedback Optical Buffers

Blocking Probability Simulations for FDL Feedback Optical Buffers

Dimensioning shared-per-node recirculating fiber delay line buffers in an optical packet switch

Performance Evaluation of an Optical Burst Switched Core Node With Generalized Arrivals and Partial Wavelength Conversion Capability

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