Navegando por Assunto "Cross-layer"

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Acesso aberto (Open Access)
Mecanismo de roteamento cross-layer em redes móveis Ad Hoc sem fio: um modelo de inteligência computacional com eficiência energética e suporte a mobilidade e QoE
(Universidade Federal do Pará, 2016-03-18) CARVALHO, Tássio Costa de; FRANCÊS, Carlos Renato Lisboa; http://lattes.cnpq.br/7458287841862567
The evolution of wireless communications technologies has led to the need to provide network support for data and video applications and thus promote the development of new types of network configurations adapted to these new requirements. MANET is an important type of operation networks that employs mechanisms that can enable dynamic autoconfiguration, which requires a higher efficiency of its routing protocols. These protocols can also be challenged due to energy failures that are becoming increasingly severe in relation to the common networks failure; furthermore, the quality of the multimedia stream corresponds to a fundamental premise to the next generation wireless networks and the future Internet. This thesis proposes a new routing mechanism based on cross-layer paradigm to enhance the main routing protocols, by inserting new metrics in a computational intelligence decision making based on fuzzy systems, providing energy efficiency, support to manage mobility and quality experience to the devices, choosing the best route for the flow of computer networks. The proposal is evaluated in network simulator, demonstrating its efficiency through network results, quality of experience metrics and maximizing the communication’s lifetime.
Acesso aberto (Open Access)
Um modelo cross layer para predição de parâmetros de desempenho em redes sem fio baseados em OFDM
(Universidade Federal do Pará, 2011-11-28) MACHADO, Victor de Andrade; FRANCÊS, Carlos Renato Lisboa; http://lattes.cnpq.br/7458287841862567
This dissertation work aims to create a mathematical model that performs the adjustment of data obtained from measurement campaigns using a prototype of a WiMAX scenario. The measurement campaigns were made at the Federal University of Para, using equipment which would enable such work. WiMAX antennas were used, one as a server, located in the building up of High Performance Network Planning Laboratory (LPRAD), and the other receiver, who was on top of a vehicle so that the points were collected. The adjustment method used was the Linear Least Squares. Through the collected data, the method is applied and their behavior is studied, checking how the optimization was effective in the cases presented. The use of relevant technology such as Internet access in some programs like NAVEGAPARÁ, the search for improvements or creation of propagation models and cross-layer analysis of the metrics used in the work, as the influence of signal to noise ratio in the loss frame, are motivating factors for this dissertation research.