Encontrados 8 documentos, a visualizar página 1 de 1
A Cross-System Approach for Multimedia Services with IP Multicast in 4G Networks
Gomes, Diogo; Aguiar, Rui L.; Sargento, SusanaThe increased demand for multimedia services by mobile end users in recent years have driven both Broadcast and Wireless Network operators to develop new systems and architectures for the deployment of such services. The proposed solutions are nonetheless limited either in terms of QoS or Capabilities to deliver new interactive services. This paper highlights strengths and drawbacks of the existing technologies...
PRIVED: a Privacy Model for Heterogeneous Mobile Networks
Matos, Alfredo; Sargento, Susana; Aguiar, RuiWe propose a network-oriented privacy model (PRIVED) composed by a well defined information model, using events, information sets and relationships to define the conceptual privacy relationships that can occur in the network. We propose formal rules and a network instantiation, using linkability and correlation as the main tools for network applicability. We also use the model to determine the best approaches tow...
FastM: Design and Evaluation of a Fast Mobility Mechanism for Wireless Mesh Net...
Couto, Luís; Barraca, João; Sargento, Susana; Aguiar, Rui LuísAlthough there is a large volume of work in the literature in terms of mobility approaches for Wireless Mesh Networks, usually these approaches introduce high latency in the handover process and do not support realtime services and applications. Moreover, mobility is decoupled from routing, which leads to inefficiency to both mobility and routing approaches with respect to mobility. In this paper we present a n...
Development of a Hybrid Simulation and Emulation Testbed For VANETs
Costa, Rui; Sargento, Susana; Aguiar, R.; Zhang, W.In the area of Intelligent Transportation System traffic efficiency and safety for users have become very popular topics and have triggered extensive research in Vehicular Ad-Hoc Networks (VANETs). Traditional methods for reaserch and development like field testing and simulation have been used. But field testing is usually very expensive and simulation lacks accuracy in wireless environments. This article aims to ...
QoS in 4G scenarios using NSIS protocol
Ferreira, Fábio; Sargento, Susana; Aguiar, Rui L.This paper presents qualaty of service mechanisms, based on NSIS ( Next Steps in Signaling) protocol. For that, it was implemented a testbed with NSIS running through IPv6. The network's QoS was mesured by the number of drops, for each flow (either QoS or Best Effort traffic), occurred inrouters. The first experiment shows the captured packets during a node association and request for QoS, namely a GIST sessio...
Experimental evaluation of the usage of ad hoc networks as stubs for multiservi...
Sarrô, Rafael; Barraca, João Paulo; Sargento, Susana; Aguiar, Rui L.; Almeida, MiguelThis paper describes an experimental evaluation of a multiservice ad hoc network, aimed to be interconnected with an infrastructure, operator-managed network. This network supports the efficient delivery of services, unicast and multicast, legacy and multimedia, to users connected in the ad hoc network. It contains the following functionalities: routing and delivery of unicast and multicast services; distribute...
End-to-end QoS architecture for 4G scenarios
Sargento, Susana; Sousa, Filipe; Gonçalves, Pedro; Gozdecki, Janusz; Gomes, Diogo; Guainella, Emiliano; Cuevas, Antonio; Dziunikowski, WojciechThis paper describes the QoS architecture and the corresponding QoS signalling protocols to be developed inside the IST project Daidalos. We address the main results achieved in terms of the definition of the QoS components and its interfaces, the description of the application and network services, definition of the signalling scenarios for the integration of the QoS signalling with the application signalling ...
Gestão de recursos em redes com suporte de qualidade de serviço
Sargento, SusanaEsta Tese aborda a problemática da gestão de recursos em redes ATM (Asynchronous Transfer Mode) e IP (Internet Protocol) com suporte de QdS (Qualidade de Serviço). As tecnologias ATM e IP permitem, hoje em dia, integrar diferentes tipos de serviços numa mesma infra -estrutura de rede. No entanto, a diversidade dos serviços a suportar e dos seus requisitos, coloca grandes desafios ao nível da gestão de recursos,...
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