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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

[pt] D-RAMA: UM NOVO PROTOCOLO DE ACESSO PARA SERVIÇOS INTEGRADOS EM SISTEMAS MÓVEIS DE TERCEIRA GERAÇÃO / [en] D-RAMA: A NEW ACCESS PROTOCOL FOR THIRD GENERATION WIRELESS INTEGRATED SERVICES

JAVIER GUSTAVO SANTIVANEZ GRAMAJO 18 November 2005 (has links)
[pt] Existe um crescente interesse na introdução de serviços integrados no ambiente de comunicações móveis e sem fio. Estes serviços podem incluir, em alguns casos, informação na forma de áudio, vídeo, imagens e dados simultaneamente junto com o serviço existente de voz nas redes celulares. Devido à necessidade por maior faixa, o aumento da capacidade da interface rádio continuará sendo um dos principais requisitos para a introdução destes novos serviços. Para atender esta necessidade, vários métodos de acesso estão sendo propostos. Esta tese propõe um novo protocolo de acesso, D-RAMA, que visa extender os métodos de acesso determinísticos TRAMA e FRAMA. A validação do algoritmo é feita por meio de simulação considerando diversas interfaces rádio, assim como diferentes tipos de tráfegos. / [en] Third generation systems will present several new enhancements while compared with current second generation technologies. Some of the most important ones are the support of integrated services (audio, video, data) as well as speech, operation in different radio environments with several propagation conditions and increased capacity. These features demand an efficient media access control (MAC) protocol, supporting both Constant Bit Rate (CBR) and Variable Bit Rate (VBR) traffic types with different Quality of Service (QoS) requeriments. In order to supply this demand, several packet access methods are being proposed. This thesis presents a new media access protocol, D-RAMA (Dynamic Priorities Resource Auction Multiple Access) and FRAMA (Fair resource Auction Multiple Access) methods, and is designed to fulfill the requirements of third generation systems. The protocol is validated through simulations, considering several radio interfaces and traffic sources.

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