N. Anastacio

Universidade da Beira Interior, Ковильян, Castelo Branco, Portugal

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Publications (2)0 Total impact

  • F.J. Velez, N. Anastacio, F. Merca, O. Cabrai
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    ABSTRACT: An overview of all-IP enhanced Universal Mobile Telecommunication System, E-UMTS, service needs in the business city centre, BCC, scenario is first presented. Then, E-UMTS traffic generation and activity models are described and characterised. System level simulations are carried out and the enhanced performance is demonstrated based in a single quality parameter, which simultaneously accounts for call blocking and handover failure probabilities. End-to-end delays do not present a limitation. By considering a grade of service of 1% for the quality parameter, and different hypothesis for costs and prices, an optimum coverage distance is obtained around ~200-425 m, which maximises the supported throughput per km<sup>2</sup>. However, results for the profit in percentage indicates that coverage distances in the range 395-425 m should be used in BCC.
    Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th; 05/2007
  • N. Anastacio, F. Merca, O. Cabral, F.J. Velez
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    ABSTRACT: After 3G mobile and wireless systems take-up, the research community is now directing its interest towards unified ways of looking at system design, optimization, and quality of service (QoS) issues to satisfy the requirements of next generation multi-service mobile and wireless IP-based networks. Their implementation requires the development of IP QoS architecture and mechanisms encompassing the various layer of the OSI Model to cope with the new requirements. This work identifies the requirements on latency (link radio), latency (end-to-end), bit error rate, data rates, and traffic characterisation for mobile multimedia network beyond 3G. Characterisation parameters were identified and values were suggested for their range of variation, in the context of cross-layer design.
    Wireless Communication Systems, 2006. ISWCS '06. 3rd International Symposium on; 10/2006