Handoff
Mostrando 13-24 de 32 artigos, teses e dissertações.
-
13. Performance analysis for data service in third generation mobile telecommunication networks
The data traffic in wireless networks for the third generation (3G) mobile telecommunication systems should take into account a variety of services (voice, data, video) and environments (e.g.: private, outdoors, indoors) as well as the user mobility behavior. A good evaluation of measures of performance can help a system designer to make its strategic decisi
Journal of the Brazilian Computer Society. Publicado em: 2003-04
-
14. RADIO RESEARCH MANAGEMENT TECHNIQUES FOR HIERARCHICAL CELL SYSTEMS / ESTUDO DE TÉCNICAS DE GERÊNCIA DE RECURSOS DE RÁDIO PARA SISTEMAS CELULARES HIERARQUIZADOS
Multilayer cell systems are useful to accommodate high traffic densities while still satisfying the QoS requirements. These systems combine the advantages of microcellular and macrocellular systems which are: the increase of system capacity and the reduction of the number of handoffs, hence decreasing the signaling load. This work address design aspects such
Publicado em: 2003
-
15. Arquitetura de mobilidade bluetooth
A tecnologia de comunicaÃÃo sem-fio Bluetooth promete revolucionar a comunicaÃÃo pessoal, e contribuir para a evoluÃÃo da âubiquitous computingâ: everywhere and everytime ─ um paradigma inspirado no acesso constante à informaÃÃo e Ãs capacidades computacionais. Bluetooth à uma especificaÃÃo para transmissÃo de voz e dados por rÃdio fre
Publicado em: 2002
-
16. CHANNEL ALLOCATION COMPARATIVE ANALYSIS FOR TDMA TECHNOLOGY / ALOCAÇÃO DE CANAIS ANÁLISE COMPARATIVA PARA TECNOLOGIA TDMA
Fixed channel assignment -FCA- brings to the Cellular Communication Systems stability at the cost of the use of frequency planning, leading to low tolerance to traffic variability. Dynamic channel assignment -DCA- algorithms have been proposed by several authors in order to minimize these problems,incorporating flexibility to the system with respect to chann
Publicado em: 2002
-
17. Metodologia de dimensionamento de canais para Soft Handoff em sistemas CDMA
ormado.
Publicado em: 2001
-
18. TARIFAÇÃO DINÂMICA EM REDES DE COMUNICAÇÕES MÓVEIS CELULARES / DYNAMIC PRICING IN CELLULAR MOBILE COMMUNICATION NETWORKS / TARIFA DINÁMICA EN REDES DE COMUNICACIONES MÓVILES CELULARES
Este trabajo presenta un modelo de tarifación dinámica cuyo objetivo es determinar cuál es el precio que deve ser cobrado por una llamada telefónica, originada en una estación móvil, de tal forma que maximize la receta de la empresa operadora del servicio móvil celular, garantizando los valores máximos aceptables para la probabilidad de bloqueo de un
Publicado em: 2001
-
19. RESOURCE ESTIMATION AND CALL ADMISSION IN COMMUNICATION NETWORKS / ESTIMAÇÃO DE RECURSOS E ADMISSÃO DE CHAMADAS EM REDES DE COMUNICAÇÕES
This work proposes a Dynamic Mobile Probability model and a mobility model, which is applied for a call admission control scheme for mobile cellular systems, called shadow cluster. This scheme gives priority to calls that are in handoff procedure. The objective of this scheme is a better call in progress quality, avoiding the call dropping. The objective of
Publicado em: 2001
-
20. DYNAMIC ALLOCATION OF CHANNEL WITH PRIORITY TO CALLS THAT ARE IN HANDOFF / ALOCAÇÃO DINÂMICA DE CANAIS COM PRIORIDADE PARA CHAMADAS EM HANDOFF
This work investigates the behavior of channel allocation schemes for Mobile Cellular Systems, when associated with channel guards giving priority to calls that are in handoff procedure. The objective of this association is a better call quality compared to the one in which this technique is not used. Simulation results show that indeed this can be achieved.
Publicado em: 1999
-
21. Analise de desempenho de uma rede celular CDMA atraves de simulação
In order to obtain the performance of a CDMA (Code Division Multiple Access) cellular network a simulator was realized. The performance was analyzed by the mean number of ongoing calls per cell, the call blocking and dropping rates and by the soft handoff rate as a function of the calling rate, path-loss exponent, soft handoff parameters, voice activity fact
Publicado em: 1998
-
22. ANALYSIS OF THE PROBLEM OF TRAFFIC CHANNEL ASSIGNMENT IN MOBILE CELLULAR SYSTEMS / UMA ANÁLISE DO PROBLEMA DA ALOCAÇÃO DOS CANAIS DE TRÁFEGO EM SISTEMAS MÓVEIS CELULARES
In this work the problem of traffic channel assignment in móbile cellular systems is adressed. The use of more efficient assignment methods represents one of the main alternatives to enhance the performance of congested systems. Moreover, the ceaseless reduction of cell sizes requires the adoption of more flexible methods already proposed are presented, and
Publicado em: 1996
-
23. ANÁLISE DE CAPACIDADE EM SISTEMAS CDMA / ANALYSIS OF THE CAPACITY IN CDMA SYSTEMS
In this work we present an investigation on the traffic capacity of CDMA systems for cellular mobile communication, with emphasis on the Erlang capacity. It is mitially made a brief analysis of the capacity in traditional FDMA/TDMA cellular systems. We then present a basic analysis of the traffic capacity in CDMA systems, assembling the models and results fr
Publicado em: 1996
-
24. Contribuições a estatistica do sinal de radio movel
Neste trabalho apresentamos algumas contribuições ao estudo do comportamento estatístico do sinal de rádio em um sistema rádio móvel. Fazemos o estudo da estatística de segunda ordem do sinal pelos cálculos da taxa de cruzamento de nível e tempo médio de desvanecimento. Também temos por objetivo a determinação da área de sobreposição entre c�
Publicado em: 1996