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Planning and dynamic spectrum management in heterogeneous mobile networks with ...
Robalo, Daniel Luís SilveiraThe radio and network planning and optimisation are continuous processes that do not end after the network has been launched. To achieve the best trade-offs, especially between quality and costs, operators make use of several coverage and capacity enhancement methods. The research from this thesis proposes methods such as the implementation of cell zooming and Relay Stations (RSs) with dynamic sleep modes and C...
Cost/revenue performance in an IMT-Advanced scenario with Spectrum Aggregation ...
Acevedo Flores, Jessica Elizabeth; Velez, Fernando J.; Cabral, Orlando; Robalo, Daniel Luís Silveira; Holland, Oliver; Aghvami, A. HamidThis paper determines the cost/revenue performance of a mobile communication system in an IMT-Advanced scenario with integrated Common Radio Resource Management (iCRRM). The iCRRM performs classic CRRM functionalities jointly with Spectrum Aggregation (SA), being able to switch users between non-contiguous frequency bands. The SA scheduling is obtained with an optimized General Multi-Band Scheduling (GMBS) algo...
Energy saving in the optimization of the planning of fixed WiMAX with relays in...
Velez, Fernando J.; Oliveira, João; Robalo, Daniel Luís Silveira; Holland, Oliver; Aghvami, A. HamidLayered and cooperative elements such as femto-cells and relays can improve performance or energy efficiency in mobile networks; however, they consume energy per se and their durations in operational state must therefore be minimised. This paper investigates the use of relays in WiMAX network deployments and concentrates on the cost/revenue performance and energy efficiency trade-off in such cases. Specifically...
Experimental characterisation of WiMAX propagation in different environments
Robalo, Daniel Luís Silveira; Oliveira, João; Velez, Fernando; Petrini, Valeria; Barbiroli, Marina; Carciofi, Claudia; Grazioso, Paolo; Fuschini, FrancoThe aim of this work is to continue the cooperation on Fixed WiMAX experimental propagation characterization between Instituto de Telecomunicações - DEM of University of Beira Interior, Portugal, Fondazione Ugo Bordoni and the Department of Electronics and Information Systems of the University of Bologna, both from Italy. The field trials addressed different environments, i.e., suburban and open areas in a hill...
Characterization of WiMAX propagation in microcellular and picocellular environ...
Barbiroli, Marina; Carciofi, Claudia; Degli-Esposti, Vittorio; Fuschini, Franco; Grazioso, Paolo; Guiducci, Doriana; Robalo, Daniel Luís SilveiraIn this paper different propagation models for coverage prediction of WiMAX microcellular and picocellular urban environments and for WiMAX indoor femtocells at 3.5 GHz are compared with experimental data. Results obtained for different urban and indoor environments show that statistical models are quite far from good agreement with experimental data while deterministic ray-tracing models provide appropriate pr...
Hybrid WiMAX and Wi-Fi networks for the support of b-Learning and Telemedicine
Costa, Rui; Velez, Fernando José; Robalo, Daniel Luís Silveira; Marques, Marco; Comissário, Cláudio; Riscado, José; Cavaleiro, Victor; Sebastião, Pedrohis paper addresses the deployment of hybrid WiMAX and Wi-Fi networks for the support of always best connected telemedicine and health sciences education applications. The available services include a LMS (Learning Management System) and several structured functionalities for b-Learning. For the support of these services, fixed and wireless LANs have been deployed, as well as an experimental point-to-multipoint...
Design and Installation of Pre-Wimax Radio Links And Relays
Velez, Fernando José; Costa, Rui; Robalo, Daniel Luís Silveira; Marques, Marco; Comissário, Cláudio; Riscado, José; Cavaleiro, VictorThis paper addresses aspects of design for WiMAX wireless networks to establish a point-to-point, PTP, link with Alvarion BreezeNET B equipment, from the Health Sciences Faculty of University of Beira Interior to Hospital Amato Lusitano (in Castelo Branco, Portugal), and also presents the respective field trial with pre-WiMAX PTP equipment. The design of the link with relays had into consideration the carrier t...
Planeamento, desenvolvimento e optimização de redes WiMAX
Robalo, Daniel Luís SilveiraEsta dissertação aborda o planeamento de redes de banda larga IEEE 802.16. Após se realizarem algumas considerações gerais sobre a evolução da norma, assim como as suas principais características, são apresentados os aspectos essenciais das camadas físicas e MAC (Medium Access Control), assim como uma análise dos parâmetros de qualidade de serviço. Revêem-se as principais topologias de redes, as tecnologias de ...