Blocking Probability
Mostrando 1-12 de 52 artigos, teses e dissertações.
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1. Adaptive Modulation and Code Strategy to Reduce Energy Consumption in Elastic Optical Network
Abstract In this paper, the novel Adaptive Modulation and Code (AMC) algorithm aims to reduce energy consumption in elastic optical network is developed. The proposed AMC algorithm adaptively allocates both, the appropriate modulation and the forward error correction (FEC), according to the actual physical distance and the optical signal to noise ratio (OSNR
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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2. Spectrum Continuity and Contiguity based Dedicated Protection for Flexible Optical Networks
Abstract Elastic optical networks (EONs) have been pointed out as a promising candidate for transporting data with high transmission rates in adaptive optical networks. Consequently, the occurrence of a failure in a simple element may cause the interruption of various services. Survival mechanisms have been crucial to try to overcome the problems created by
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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3. Wavelength assignment using a hybrid evolutionary computation to reduce cross-phase modulation
In this paper, we propose a hybrid methodology based on Graph-Coloring and Genetic Algorithm (GA) to solve the Wavelength Assignment (WA) problem in optical networks, impaired by physical layer effects. Our proposal was developed for a static scenario where the physical topology and traffic matrix are known a priori. First, we used fixed shortest-path routin
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-06
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4. Estratégias de controle dinâmico de caminhos ópticos sobre redes fotônicas WDM utilizando inteligência de enxame. / Strategies for dynamic lightpath control in WDM photonic networks using swarm intelligence.
A fundamental aspect of photonic networks based on wavelength division multiplexing (WDM) technology is the control of optical paths. An optical path, or lightpath, is a purely optical connection established between two network nodes, which can pass through several intermediate nodes. To efficiently support the demands required from a WDM network that runs h
Publicado em: 2011
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5. A study on the design of networks in competitive environments / Um estudo sobre o dimensionamento de redes em ambientes competitivos
Esta dissertação propõe um estudo de um novo modelo para o dimensionamento de redes baseadas em comutação de circuitos, tais como as redes óticas roteadas por comprimento de onda. O novo modelo é projetado para dar suporte a diversas estratégias de negócios da operadora em um mercado competitivo. Primeiramente o caso do monopólio é analisado, comp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/03/2010
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6. An efficient routing scheme to reduce packet loss in all optical networks
Optical burst switching (OBS) is a promising technology for the next generation optical Internet. A buffer-less OBS network can be implemented using ordinary optical communication equipment without the need for either wavelength converters or optical memories. However, OBS networks suffer from a relatively high blocking probability, a primary metric of inter
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2010-12
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7. Contribuições para a análise e simulação de redes ópticas: aspectos de Engenharia de Tráfego, restauração dinâmica e conversão de comprimentos de onda / Contributions for the analysis and simulation of optical networks: aspects of traffic engineering, dynamic restoration and conversion of wavelenghts
The Wavelength Division Multiplexing (WDM) technology as well as both the introduction of all optical OXCs (Optical Cross Connect) and OADMs (Optical Add/Drop Multiplexer) may provide the optical network with the networking function, i.e, the capacity to manipulate wavelengths in order to implement their routing. This possibility implies a new type of relati
Publicado em: 2009
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8. Nodes architecture and traffic engineering in optical networks / Arquitetura de nós e engenharia de tráfego em redes ópticas
Integrating telecommunication networks has enlarged the coverage, but has made operations more complex, mainly because of the architecture, formed by various layers. These layers deal with different protocols and transmission rates, as well as electrical and optical signals. The usual alternative of expanding the resources proportionally to the demand is imp
Publicado em: 2009
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9. Systemic analysis of noise penalties all-optical network / AnÃlise sistÃmica das penalidades de ruÃdo nas redes Ãpticas transparentes
In this thesis, the routing and wavelength assignment processes are addressed. Besides of considering the network layer resources (number of available wavelengths in a link), the impact of physical layer effects in the transmitted optical signals is analyzed for both processes. The optimization of the wavelength assignment process is obtained by minimizing t
Publicado em: 2007
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10. Analytical models for blocking probabilities in optical path networks with linear topologies / Modelos analiticos para probabilidades de bloqueio em redes de caminhos opticos com topologias lineares
Investigamos o problema de estimar valores de probabilidades de bloqueio em redes de caminhos ópticos com topologias lineares. Apresentamos um melhor substituto para a suposição de independência de enlaces em redes de topologia linear: a suposição de independência de objetos. Apresentamos a prova assintótica desta suposição para redes lineares infi
Publicado em: 2006
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11. Architecture and implementation of a topological information and traffic engineering service to RWA systems / Arquitetura e implementação de um serviço de informações topologicas e de engenharia de trafego para sistemas RWA
GMPLS-controlled all-optical networks are the promise to handle the increasing volume of IP traffic. The GMPLS routing and signaling protocols, mainly OSPF and RSVP, work in such a way that the route calculation for optical circuits does not take into account the wavelength (label) availability. This is not optimal in terms of network resources usage and blo
Publicado em: 2006
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12. Análise lógica de protocolos, proposta e avaliação de desempenho de um algoritmo de atribuição de rótulo baseado em SRLG em um ambiente GMPLS-WDM. / Protocol logical analysis, proposal and performance evaluation of a label assignment algorithm based on SRLG in a GMPLS-WDM environment.
To satisfy the explosive increasing demands of voice and data traffic, optical networks based on WDM and GMPLS are being developed. The GMPLS´ suite of protocols is currently being considered as the control plane for optical networks and it is compounded of signaling and routing protocols, and also the link management protocol (LMP). The LMP is an important
Publicado em: 2006