Multiobjective Optimization in Optical Networks

Barán, Benjamín; Pinto-Roa, Diego P.

doi:10.1016/b978-0-12-801538-4.00010-0

Cited by 3 publications

(3 citation statements)

References 64 publications

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“…Similarly to the above restrictions, Equation (34), and inequalities ( 35) and ( 36) indicate the initial slot between an incoming request s and an already installed request s that share at least one link with non-zero load.…”

Section: Sa Phase Formulationmentioning

confidence: 99%

“…It is worth mentioning that optimization approaches can also be classified according to the number of objective functions simultaneously optimized [34], considering (a) mono-objective approaches [5,6,8,[14][15][16][17]19,22,23,[26][27][28][29][35][36][37] and (b) multi-objective ones [13,18,20,21,24,25,33,38]. Note that the multi-objective optimization approach, taking into account the Pareto context, was reported for Routing and Spectrum Allocation (RSA) [39,40], but not for RMLSA.…”

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confidence: 99%

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Routing, Modulation Level, and Spectrum Assignment in Elastic Optical Networks—A Serial Stage Approach with Multiple Sub-Sets of Requests Based on Integer Linear Programming

Benítez

Paredes

Colbes

et al. 2023

MCA

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This paper addresses serialized approaches of the routing, modulation level, and spectrum assignment (RMLSA) problem in elastic optical networks, using multiple sequential sub-sets of requests, under Integer Linear Programming (ILP). The literature has reported two-stage serial optimization methods referred to as RML+SA, which retain computational efficiency when the problem grows, compared to the classical one-stage RMLSA optimization approach. However, there still remain numerous issues in terms of the spectrum used that can be improved when compared to the RMLSA solution. Consequently, this paper proposes RML+SA solutions considering multiple sequential sub-sets of requests, split traffic flow, as well as path-oriented and link-oriented routing models. Simulation results on different test scenarios determine that: (a) the multiple sequential sub-sets of request-based models improve computation time without worsening the spectrum usage when compared to just one set of requests optimization approaches, (b) divisible traffic flow approaches show promise in cases where the number of request sub-sets is low compared to the non-divisible counterpart, and (c) path-oriented routing succeeds in improving the used spectrum by increasing the number of candidate routes compared to link-oriented routing.

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Section: Sa Phase Formulationmentioning

confidence: 99%

mentioning

confidence: 99%

Routing, Modulation Level, and Spectrum Assignment in Elastic Optical Networks—A Serial Stage Approach with Multiple Sub-Sets of Requests Based on Integer Linear Programming

Benítez

Paredes

Colbes

et al. 2023

MCA

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show abstract

“…Algorithms performing such tasks are reffered as control algorithms [1], [16]. The circuit-switched connection between WDM networks' client terminals is called LightPath and the process of finding the path and assigning a wavelength is designated as Routing and Wavelength Assignment (RWA) problem [17], [18]. Connection management tasks, e.g., setting/releasing and monitoring LightPath connections in a network is done by NMS and EMS.…”

Section: B Path Establishment In Optical Wdm Networkmentioning

confidence: 99%

Dynamic LightPath Allocation in WDM Networks Using an SDN Controller

Qureshi

Braun

2021

IEEE Access

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Core wavelength division multiplexed (WDM) networks are widely used to provide fixed physical connectivity and bandwidth to the logically connected upper electronic layer devices using optical signals. However, growing demands for bandwidth-intensive applications and cloud-based services push optical networks carriers' to provide scalable and flexible services dynamically. Software defined networking (SDN) has the potential to program electronic layers by dynamically controlling and managing network resources using SDN controller applications. SDN's on-demand characteristics combined with the optical circuit-switching can enable optical network service providers to customize their service provisioning dynamically to the user's requirements. They enable fast provision of new services, and minimize under-utilization of resources. In this paper, a model is proposed to bring the dynamic allocation of resources which is a layer 2+ functionality, to the WDM layer using SDN. A middle-ware application based on SDN and OpenFlow for dynamic switching and provisioning of optical service is presented. The application abstracts the optical layer's connectivity, also accounting for the switching constraints. Details of the model's implementation are discussed considering classically used equipment and its performance in terms of CPU and memory utilization, topology emulation time, and latency is evaluated. Finally, the application is tested with a Cisco layer one switch. Performance results show that the latency doubles when increasing the number of fibers of an optical cross connect from 5 to 7 and keeping wavelengths equal to 8, with Clos fabric topology.INDEX TERMS Wavelength division multiplexed network (WDM), Software Defined Networking (SDN), OpenFlow protocol, dynamic path allocation, optical cross connect (OXC).

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Spectral and energy efficiency tradeoff in optical code division multiple access networks

Martinez

Abrão

2020

Trans Emerging Tel Tech

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A paradigm on the energy efficiency (EE) and spectral efficiency (SE) tradeoff named resource efficiency (RE) exploits the EE‐SE equilibrium, which is formulated as Pareto optimal set based on two objectives balancing power consumption against occupied bandwidth. In optical code division multiple access (OCDMA) networks, the EE‐SE tradeoff is discussed by formulating a multiobjective optimization problem, while solutions are compared by deploying the weighted sum (WS) and ‐Constraint (‐C) scalarization procedures combined with nonlinear programming methods. The generalized RE optimization problem with QoS guarantees for the OCDMA networks is formulated considering that such methods result in the same Pareto boundaries. Theoretical results demonstrate that the obtained numerical optimized solutions are efficient due to the multiobjective characteristics of the optimization problem. Also, considering the numerical tests performed, it is noteworthy that the ‐C procedure found a greater diversity of solutions inside the Pareto front when compared with the WS method.

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Multiobjective Optimization in Optical Networks

Cited by 3 publications

References 64 publications

Routing, Modulation Level, and Spectrum Assignment in Elastic Optical Networks—A Serial Stage Approach with Multiple Sub-Sets of Requests Based on Integer Linear Programming

Routing, Modulation Level, and Spectrum Assignment in Elastic Optical Networks—A Serial Stage Approach with Multiple Sub-Sets of Requests Based on Integer Linear Programming

Dynamic LightPath Allocation in WDM Networks Using an SDN Controller

Spectral and energy efficiency tradeoff in optical code division multiple access networks

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