Encontrados 11 documentos, a visualizar página 1 de 2
A Novel Fast Local Mobility Protocol for Next Generation Mobile Networks
Nuno G. Ferreira; Rui Aguiar; Susana SargentoIn the current mobile cellular networks the terminal mobility support is based on layer-1 and homogenous layer-2 mechanisms. This mobility support is sufficient for current numbers of mobile terminals, however in the future it is expected that this number will significantly increase. In order to handle the increasing number of mobile terminals with distinct layer-2 interfaces and also to support the paradigm of...
QoS in 4G scenarios using NSIS protocol
Fábio Ferreira; Susana Sargento; Rui L. AguiarThis paper presents quality of service mechanisms, based on the NSIS (Next Steps In Signaling) protocol. For that, it was implemented a testbed with NSIS running through IPv6. The network’s QoS was measured by the number of drops, for each flow (either QoS or Best Effort traffic), occurred in routers. The first experiment shows the captured packets during a node association and request for QoS, namely a G...
Quality of Service and Mobility Support in WiMAX Networks
Telmo Pereira; Susana Sargento; Pedro NevesThis paper presents the enhancement of the IEEE 802.16 Broadband Wireless Access (BWA) technology with automate Quality of Service (QoS) and resources management integration attending to the inherent requirements of Next Generation Networks. A novel IEEE 802.16 based architecture is presented, focused on a new designed and implemented model named 802.16 System Manager. The later is responsible to fetch informat...
Evaluation of WiMAX Networks with Mobility
Pedro Neves; Márcio Melo; Susana SargentoThe Internet access paradigm is changing and a wide range of overlapping radio access technologies, such as WiMAX, Wi-Fi, 3GPP LTE/UMTS and DVB-H, will soon be available to most users and their multi-access devices.Therefore, novel mechanisms and protocols are needed toprovide seamless mobility between different wireless accesstechnologies. This paper presents novel handover procedures, based on media independe...
Technological Solutions for WiMAX Network Planning
Bruno Rés; Susana SargentoThe planning of broadband access network topologies poses several challenges, as different access technologies may have different bandwidth, robustness, and installation cost requirements, which should be jointly considered in the conception of the overall network topology, to properly match the end users requirements. This paper addresses the planning of wireless networks using IEEE 802.16, for a set of differ...
Intelligence in Mobility Decisions
Nuno Coutinho; Susana Sargento; Vítor JesusIn the future, different technologies, such as Wi-Fi, UMTS, HSDPA and Wimax, will converge in a complementary manner forming a heterogeneous infrastructure.Moreover, the evolution of mobile terminals will allow them to connect simultaneously to several access networks and make use of multihoming capabilities. Thus, the concept of “always best connected” (ABC), consisting in using the devices and acc...
Implementation Mobility in WiMAX Networks
Pedro Neves; Ricardo Matos; Susana SargentoThe anticipated deployment of IEEE 802.16-based wireless metropolitan area networks (WMANs) will usher a new era in broadband wireless communications. The adoption of WiMAX technology for remote areas, for example, can address challenging scenarios in a cost-effective manner. While WiMAX Forum documents describe an architecture that inherently supports Quality of Service and mobility, several areas are left unc...
Secção Especial: Programa Doutoral em Engenharia Electrotécnica 2009-2010
Susana Sargento; Esta edição da Revista contém uma secção especial consitituída por uma selecção de alguns artigos realizados no âmbito da Disciplina de Seminários do Programa Doutoral em Engenharia Electrotécnica do DETI no ano lectivo de 2009/2010. (...)
Um sistema experimental de Near Video on Demand
Ricardo Cadime; Susana Sargento; Henrique Vale; Jorge Ferraz de Abreu; Miguel Ilídio Monteiro; A. Manuel de Oliveira DuarteThis article describes the work done on the development of a Near Video on Demand system. The system is divided in several blocks, which were independently developed, although they are not autonomous. Thus, the main development effort wasfocused in the following subsystems: video channels coding (pseudo-dynamic encryption), video server and access controller, data transmission, bot...
Technological Challenges in Optical Switching Packets
João Paulo Madaleno; António Teixeira; Susana Sargento; As redes ópticas de comutação de pacotes (OPS -Optical Packet Switching) são cada vez mais uma alternativacredível às outras redes ópticas. O OPS promete trazer aflexibilidade e eficiência da Internet para as redes ópticascom taxas de transferência além das disponíveis actualmente.Neste artigo descreve-se o estado da arte das ...
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