Accurate and approximate evaluations of asynchronous tunable-wavelength-converter sharing schemes in optical burst-switched networks

Yao, Mingwu; Liu, Zengji; Ai-jun, Wen

doi:10.1109/jlt.2005.856278

Cited by 11 publications

(8 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An approximate analytical model to evaluate packet loss for the SPN scheme is given in Mingwu et al [19] for the asynchronous scenario with Poisson input but only for balanced traffic. An alternative organization of the SPN scheme to improve scalability is proposed in Chan et al [20].…”

Section: Introductionmentioning

confidence: 99%

Shared-per-wavelength asynchronous optical packet switching: A comparative analysis

et al. 2010

View full text Add to dashboard Cite

a b s t r a c tThis paper compares four different architectures for sharing wavelength converters in asynchronous optical packet switches with variable-length packets. The first two architectures are the well-known shared-per-node (SPN) and shared-per-link (SPL) architectures, while the other two are the shared-per-input-wavelength (SPIW) architecture, recently proposed as an optical switch architecture in synchronous context only, which is extended here to the asynchronous scenario, and an original scheme called shared-per-output-wavelength (SPOW) architecture that we propose in the current article. We introduce novel analytical models to evaluate packet loss probabilities for SPIW and SPOW architectures in asynchronous context based on Markov chains and fixed-point iterations for the particular scenario of Poisson input traffic and exponentially distributed packet lengths. The models also account for unbalanced traffic whose impact is thoroughly studied. These models are validated by comparison with simulations which demonstrate that they are remarkably accurate. In terms of performance, the SPOW scheme provides blocking performance very close to the SPN scheme while maintaining almost the same complexity of the space switch, and employing less expensive wavelength converters. On the other hand, the SPIW scheme allows less complexity in terms of number of optical gates required, while it substantially outperforms the widely accepted SPL scheme. The authors therefore believe that the SPIW and SPOW schemes are promising alternatives to the conventional SPN and SPL schemes for the implementation of next-generation optical packet switching systems.

show abstract

Section: Introductionmentioning

confidence: 99%

Shared-per-wavelength asynchronous optical packet switching: A comparative analysis

et al. 2010

View full text Add to dashboard Cite

show abstract

“…To the best of our knowledge, a numerical CTMC (Continuous Time Markov Chain) based algorithm for PWC in asynchronous SPL architectures is first proposed in [14]. Recently, a similar CTMC-based analysis is also proposed in [15] for the SPL case with Poisson packet arrivals and exponentially distributed packet lengths, and an approximate analysis is proposed for the SPN case. Although the analysis of [15] for the SPL case is similar to that of [14], the block structure of the CTMC is not exploited and the authors report problems in large systems (e.g., K = 64) and for rare blocking probabilities.…”

mentioning

confidence: 99%

Wavelength converter sharing in asynchronous optical packet/burst switching: An exact blocking analysis for markovian arrivals

Akar

Karasan

Dogan

2006

IEEE J. Select. Areas Commun.

View full text Add to dashboard Cite

Abstract-In this paper, we study the blocking probabilities in a wavelength division multiplexing-based asynchronous bufferless optical packet/burst switch equipped with a bank of tuneable wavelength converters dedicated to each output fiber line. Wavelength converter sharing, also referred to as partial wavelength conversion, corresponds to the case of a number of converters shared amongst a larger number of wavelength channels. In this study, we present a probabilistic framework for exactly calculating the packet blocking probabilities for optical packet/burst switching systems utilizing wavelength converter sharing. In our model, packet arrivals at the optical switch are first assumed to be Poisson and later generalized to the more general Markovian arrival process to cope with very general traffic patterns whereas packet lengths are assumed to be exponentially distributed. As opposed to the existing literature based on approximations and/or simulations, we formulate the problem as one of finding the steady-state solution of a continuous-time Markov chain with a block tridiagonal infinitesimal generator. To find such solutions, we propose a numerically efficient and stable algorithm based on block tridiagonal LU factorizations. We show that exact blocking probabilities can be efficiently calculated even for very large systems and rare blocking probabilities, e.g., systems with 256 wavelengths per fiber and blocking probabilities in the order of 10 −40 . Relying on the stability and speed of the proposed algorithm, we also provide a means of provisioning wavelength channels and converters in optical packet/burst switching systems.Index Terms-Optical packet switching, optical burst switching, wavelength conversion, converter sharing, block-tridiagonal LU factorization, Markovian arrival process.

show abstract

“…Various schemes such as wavelength conversion [4], optical buffering [5], burst segmentation (BS) [6,9], and deflection routing [11] are proposed for contention resolution in the literature. Also see [15][16][17][18][19][20].…”

Section: Contention Resolution In Obsmentioning

confidence: 99%

A cluster network based distributed resource management scheme for OBS networks

Pule

Bakhe²,

Mutsvangwa³

2016

2016 International Conference on Advances in Computing and Communication Engineering (ICACCE)

View full text Add to dashboard Cite

Abstract-All-optical networks (AON) based on optical burst switching (OBS) are rapidly becoming the ultimate backbone network solution for next (future) generation networks because of their potential ultra high bandwidth capacities both at transmission and switching levels. The OBS switching paradigm was conceptualized and ultimately designed using the good features of both optical circuit switching (OCS ) and optical packet switching (OPS) and thus provides improvements over wavelength routing in terms of bandwidth efficiency, at the same time eliminating the need for huge buffers at the network edges as well as optical -to-electronic conversions and vice-versa of the data bursts at the core (switching) nodes. With such networks end to end light channels will transmit users data , transparently i.e. without being aware of its bit rate, modulation format as well as network protocol thus enhancing capacity, flexibility and scalability of the network. A buffer less /limited buffered lead OBS network would mean high contention and blocking, hence to guarantee and end-to-end consistent QoS in would require that the resources are properly managed. Effective management of both control and data planes is a key issue in this regard. Thus in this paper, we propose and analyse a partial distributed resource management scheme for OBS networks. We describe the concept, followed by routing and wavelength selection procedures.

show abstract

Accurate and approximate evaluations of asynchronous tunable-wavelength-converter sharing schemes in optical burst-switched networks

Cited by 11 publications

References 21 publications

Shared-per-wavelength asynchronous optical packet switching: A comparative analysis

Shared-per-wavelength asynchronous optical packet switching: A comparative analysis

Wavelength converter sharing in asynchronous optical packet/burst switching: An exact blocking analysis for markovian arrivals

A cluster network based distributed resource management scheme for OBS networks

Contact Info

Product

Resources

About