Browsing by Issue Date, starting with "2006-05"
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- Enhanced UMTS Micro-Celular Multi-Service Planning Optimisation in Business City CentresPublication . Franco, Cátia; Rei, Ricardo; Velez, Fernando JoséOptimisation of the cellular planning process for multi-service Enhanced UMTS in business city centre environments is addressed by using results for system capacity as an input for a cost/revenue function. Based in a definition of simulations scenarios, traffic behaviour, and Quality of Service aspects, a System Level Simulator is used for obtaining system capacity results in the business city centre scenario when overload conditions are considered. Optimum values of the cell coverage distance that maximise the profit per unit length were found. For prices of 5 and 7 Euro cents/MB, optimum values of 80 and 150 % occur around 240m, respectively.
- Enhanced UMTS Simulation-based Cellular Planning in Urban ScenariosPublication . Cabral, Orlando Manuel Brito; Velez, Fernando José; Franco, Cátia; Rei, RicardoAspects of cellular planning for E-UMTS (Enhanced UMTS) are addressed, and results for system capacity are obtained, as a function of the coverage distance. E-UMTS traffic generation and activity models are described and characterised, based on population and service penetration values. An urban scenario was defined with a selection of relevant multi-rate bursty applications. By using a System Level Simulator results were obtained for the end-to-end delay, and for blocking and handover failure probabilities. By using these results, models for the supported fraction of active users and throughput were obtained, as a function of the cell coverage distance. When the coverage distance decreases from 600 to ~200 m, the supported throughput per km2 increases from ~1Mb/s to ~5 Mb/s. By using trisectorial antennas with one amplifier a maximum throughput per BS of 600kb/s was obtained.
- Urban Cellular Planning Optimisation of Multi-service Enhanced UMTS Based in Economic IssuesPublication . Cabral, Orlando Manuel Brito; Velez, Fernando J.; Franco, Cátia; Rei, RicardoResults for Enhanced UMTS (E-UMTS) cost/revenue optimisation are obtained, as a function of the coverage distance, R. E-UMTS traffic generation and activity models are described and characterised in an urban scenario based on population and service penetration values. By using a System Level Simulator results were obtained for blocking and handover failure probabilities. Models for the supported fraction of active users and for the supported throughput, as a function of active users, were obtained. When one amplifier is used, the maximum throughput per BS is around 600kb/s. However, it achieves values up to 2000kb/s when three amplifiers per BS are considered. Generally, the profit in percentage is a decreasing function with R. The use of three amplifiers per BS is strongly advised in order to get cheaper communications, with prices that vary from 0.016 to 0.07 €/min, for R=250 and 1075m, respectively.
- Cellular Planning of an IEEE 802.16 Wireless Metropolitan Area NetworkPublication . Velez, Fernando José; Carvalho, Vitor; Santos, Dany; Marcos, Rui P.; Costa, Rui; Sebastião, Pedro; Tomé, Ricardo; Rodrigues, AntónioThis work intends to develop a WiMax (Worldwide Interoperability for Microwave Access) point-to-multipoint wireless network that includes all the district of Covilhã, and particularly the urban area of the city in detail, with the objective to guarantee a point-to-multipoint connection from the Health Science Faculty of the University of Beira Interior (HSF/UBI) / Hospital Pêro da Covilhã to all urban area of the centre of the city. The cellular planning of this WiMax mobile network was done having in account aspects related with the carrier-to-noise ratio and carrier-to-interference ratio, concluding that is necessary to consider a cellular structure with coverage distances of 3 km and sectorisation is needed to create a high capacity wireless network in the urban area of Covilhã. Because this zone is very hilly, the choice of the location for base stations is essential; one used the potentialities of the GIS (Geographic Information Systems) tools to optimize the line of sight coverage and, simultaneously, reduce the propagation exponent. A new mobile IP architecture for Wi-Fi/WiMax interoperability is being conceived, developed and implemented based in Media Independent Handover.