Journal ArticleDOI
Elastic Bandwidth Allocation in Flexible OFDM-Based Optical Networks
TLDR
This work introduces the Routing, Modulation Level and Spectrum Allocation (RMLSA) problem, as opposed to the typical Routing and Wavelength Assignment (RWA) problem of traditional WDM networks, proves that it is also NP-complete and presents various algorithms to solve it.Abstract:
Orthogonal Frequency Division Multiplexing (OFDM) has recently been proposed as a modulation technique for optical networks, because of its good spectral efficiency, flexibility, and tolerance to impairments. We consider the planning problem of an OFDM optical network, where we are given a traffic matrix that includes the requested transmission rates of the connections to be served. Connections are provisioned for their requested rate by elastically allocating spectrum using a variable number of OFDM subcarriers and choosing an appropriate modulation level, taking into account the transmission distance. We introduce the Routing, Modulation Level and Spectrum Allocation (RMLSA) problem, as opposed to the typical Routing and Wavelength Assignment (RWA) problem of traditional WDM networks, prove that is also NP-complete and present various algorithms to solve it. We start by presenting an optimal ILP RMLSA algorithm that minimizes the spectrum used to serve the traffic matrix, and also present a decomposition method that breaks RMLSA into its two substituent subproblems, namely 1) routing and modulation level and 2) spectrum allocation (RML+SA), and solves them sequentially. We also propose a heuristic algorithm that serves connections one-by-one and use it to solve the planning problem by sequentially serving all the connections in the traffic matrix. In the sequential algorithm, we investigate two policies for defining the order in which connections are considered. We also use a simulated annealing meta-heuristic to obtain even better orderings. We examine the performance of the proposed algorithms through simulation experiments and evaluate the spectrum utilization benefits that can be obtained by utilizing OFDM elastic bandwidth allocation, when compared to a traditional WDM network.read more
Citations
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Proceedings ArticleDOI
Inter-datacenter virtual capacity services: Reality and mechanisms
TL;DR: This work initially presents the capacity services landscape as it is formulated, and proposes optimal Integer Linear Programming (ILP) based mechanisms for matching network demands to networking capacity services, in the same way users' computing requirements can be matched to virtual computing instances.
Journal ArticleDOI
Cost-adaptive multi-class multicast service aggregation based on distributed sub-trees in elastic optical data center networks
TL;DR: This paper studies potential performance gains resulting from applying a distributed sub-tree scheme to multi-class multicast service aggregation, realizing reduced overall cost and proposes a heuristic algorithm for large-scale networks that can be beneficial in terms of both spectrum and transceiver utilization in EODCNs.
Proceedings ArticleDOI
Nested Column Generation Algorithm for the Routing and Spectrum Assignment Problem in Flexgrid Optical Networks
Adham Mohammed,Brigitte Jaumard +1 more
TL;DR: In this article, a decomposition model and a nested column generation algorithm are proposed to solve the Routing and Spectrum Assignment (RSA) problem for large data instances, and a measure of the solution accuracy is provided, i.e., an upper bound on the maximum distance of the solutions obtained compared to the optimal solution.
DissertationDOI
Dynamic survivable multipath provisioning in OFDM-based flexible optical networks
TL;DR: A chronology of key events and events leading to the creation of the modern-day Republic of Ireland is described.
Posted Content
Multilayer Routing and Resource Assignment in Spatial Channel Networks (SCNs): Oriented Toward the Massive SDM Era.
TL;DR: An integer linear programming (ILP) model and a heuristic algorithm are proposed to solve the problem of resource allocation in SCNs, the first work to focus on this new problem as the routing, spatial channel, and spectrum assignment (RSCSA) problem.
References
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Journal ArticleDOI
OFDM for Optical Communications
TL;DR: In this paper, the authors give a tutorial overview of OFDM and highlight the aspects that are likely to be important in optical applications, and discuss the constraints imposed by single mode optical fiber, multimode optical fiber and optical wireless.
Journal ArticleDOI
Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies
Masahiko Jinno,Hidehiko Takara,Bartlomiej Kozicki,Yukio Tsukishima,Yoshiaki Sone,Shinji Matsuoka +5 more
TL;DR: This article proposes a novel, spectrum- efficient, and scalable optical transport network architecture called SLICE, which enables sub-wavelength, superwa wavelength, and multiple-rate data traffic accommodation in a highly spectrum-efficient manner, thereby providing a fractional bandwidth service.
Journal ArticleDOI
Distance-adaptive spectrum resource allocation in spectrum-sliced elastic optical path network [Topics in Optical Communications]
Masahiko Jinno,Bartlomiej Kozicki,Hidehiko Takara,Atsushi Watanabe,Yoshiaki Sone,Takafumi Tanaka,Akira Hirano +6 more
TL;DR: A concept of a novel adaptation scheme in SLICE called distance-adaptive spectrum resource allocation, which can save more than 45 percent of required spectrum resources for a 12-node ring network, is presented.
Journal ArticleDOI
Optical burst switching: a new area in optical networking research
Yang Chen,Chunming Qiao,Xiang Yu +2 more
TL;DR: This tutorial gives an introduction to optical burst switching and compare it with other existing optical switching paradigms, and describes a prevailing protocol for OBS networks called just-enough-time (JET).