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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Routing Code and Spectrum Assignment (RCSA) in Elastic Optical Networks N. Sambo, G. Meloni, F. Cugini, A. D'Errico, L. PotP. Iovanna, and P. Castoldi
TL;DR: In this paper, the authors propose a code selection in RSA for EONs, by proposing a routing, code, and spec- trum assignment (RCSA) for dynamic set up.
Journal ArticleDOI
Routing, modulation, and spectrum assignment in programmable networks based on optical white boxes
TL;DR: This work forms the routing, modulation, and spectrum assignment (RMSA) problem in AoD-based EONs and proposes three RMSA strategies aimed at optimizing a particular combination of these performance indicators, which can achieve remarkable cost savings.
Journal ArticleDOI
Dynamic service provisioning in space-division multiplexing elastic optical networks
Shengyu Zhang,Kwan L. Yeung +1 more
TL;DR: It is shown that by packing lightpaths toward FSs with the smallest FS indexes, the spectrum-first approach leaves bigger contiguous FS blocks for future requests, and the request blocking probability is minimized.
Proceedings ArticleDOI
On Minimization of the Spectrum Usage in Elastic Optical Networks with Joint Unicast and Anycast Traffic
TL;DR: A Tabu Search algorithm for Routing and Spectrum Allocation with joint unicast and anycast traffic in Elastic Optical Networks (EONs) is proposed and numerical experiments are presented to verify the algorithm and show main features of EONs with any cast traffic.
Proceedings ArticleDOI
Zone based Spectrum Assignment in Elastic Optical Networks: A fairness approach
TL;DR: Results show that the proposed Routing and Spectrum Assignment algorithm achieves desired fairness and reduces blocked bandwidth ratio.
References
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Journal ArticleDOI
Combinatorial optimization: algorithms and complexity
TL;DR: This clearly written, mathematically rigorous text includes a novel algorithmic exposition of the simplex method and also discusses the Soviet ellipsoid algorithm for linear programming; efficient algorithms for network flow, matching, spanning trees, and matroids; the theory of NP-complete problems; approximation algorithms, local search heuristics for NPcomplete problems, more.
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).