Mobile Stations
Mostrando 1-12 de 17 artigos, teses e dissertações.
-
1. Green-Markov models - new optimization strategies: a case study for user allocation in co-channel macro/femto networks
The femtocell concept aims to combine fixed-line broadband access with mobile telephony using the deployment of low-cost, low-power third and fourth generation base stations in the subscribers' homes. While the self-configuration of femtocells is a plus, it can limit the quality of service (QoS) for the users and reduce the efficiency of the network, based o
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2012-12
-
2. Planejamento e gerenciamento de recursos para redes IEEE 802.16 baseadas em rádio sobre fibra / Resource planning and management for IEEE 802.16 networks based on radio over fiber
The Radio over Fiber technology allows the reduction of the cost of installation and maintenance of wireless access networks, since it can allow an optimized use of radio frequency (RF). Moreover, it employs simplified and inexpensive antennas. The IEEE 802.16 wireless networks, known as WiMAX, are low cost solutions for the last mile access to the Internet.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/06/2011
-
3. Localização de usuários usando o sistema celular. / Users localization using cellular system.
The mobile location technique using the cellular system received a special attention from the telecommunication manufacturers and operators, regarding the need of accomplishing the established demands by the emergency service calls and other commercial ones. This study analyzes the main location methods proposed in the literature, including, in each one, the
Publicado em: 2007
-
4. Work and hygiene safety in water treatment plants / Segurança e higiene do trabalho em estações de tratamento de agua
In places with human activities, such as Water Treatment Plants (WTP), there are many factors which can cause accidents: the use of various tools, noisy machinery without protection on mobile parts, chemical substances, slippery or irregular floors, unprotected electric devices, and entrance in unenough oxygenated places. When previously identified, these fa
Publicado em: 2006
-
5. TOLERÂNCIA À FALHA DOS AGENTES DE MOBILIDADE DO PROTOCOLO MOBILE IP / FAULT TOLERANCE OF MOBILITY AGENTS OF PROTOCOL MOBILE IP
The growth of the Internet, as much of the point of view of the number of users as of the offered services, and the fast progress of the wireless communication technology, it became possible a demand for wireless systems that allow the access the Internet. However, one of the main challenging factors for the development this new access way is the mobility of
Publicado em: 2005
-
6. Indexação de objetos móveis : uma estratégia para garantir a alocação dinâmica de canais em redes celulares
In cellular networks, communication among mobile devices is accomplished through base stations (fixed antennas). A base station allocates communication channels whenever a mobile device (a cell phone, for example) in its coverage area requests communication with some other device (mobile or fixed). With the rapidly growing number of mobile devices, the use o
Publicado em: 2005
-
7. Métodos de subgradiente e de dilatação de espaços aplicados ao projeto de rede de telefonia móvel
This work presents a comparative study of Lagrangean relaxation using Subgradient and Spaces Dilatation methods to solve the generalized assignment problem in diversity and capacity constraints (GAP-DC). This problem,appears during the planning of a mobile telephone network. It consists in assigning radio base stations to hubs at a minimal cost, so that the
Publicado em: 2005
-
8. Tecnologia de estruturas EBG - electromagnetic ban-gap : aplicada a antenas para comunicações moveis
This work describes the application of EBG, Electromagnetic Band-Gap, structures on antennas for mobile communication systems. This technology can be used in both 3G and 4G mobile communication systems; for base stations, pico ba..c;;e stations, and mobile terminaIs; on WLAN, Wi-Fi, Bleutooth, WiMAX (IEEE802.16a), and other technologies. EBG structures are d
Publicado em: 2004
-
9. Monitoração de controle de Tilt e Azimute das antenas de estações radio base da telefonia celular / Monitoring and control of antenna Tilt and Azimuth for radio-base station
A partir dos meados dos anos 90, com o surgimento da telefonia celular analógica e posteriormente digital, o número de usuários da telefonia celular aumenta vertiginosamente e em 2004 já supera no Brasil o número de telefones fixos, 54 milhões de celulares e 49 milhões de telefones fixos (Dados Teleco de Junho/2004). Este trabalho descreve de uma form
Publicado em: 2004
-
10. RADIOLOCALIZAÇÃO DE TERMINAIS DE COMUNICAÇÕES MÓVEIS / RADIOLOCATION OF MOBILE COMMUNICATIONS TERMINALS
This work addresses the radiolocation problem of a moving terminal in a cellular mobile communications environment. New alternatives are developed for position estimation, assuming that the Time of Arrival (ToA) measurements obtained from radio link are corrupted by additive noise and have positive mean error during random periods of time due to the non-line
Publicado em: 2004
-
11. ESTUDO E SIMULAÇÃO DE TÉCNICAS DE LOCALIZAÇÃO DE TERMINAIS EM AMBIENTES MICROCELULARES / INVESTIGATION AND SIMULATION OF TERMINAL LOCATION TECHNIQUESIN MICROCELLULAR SYSTEMS
The location of mobile terminals in mobile cellular systems has been receiving increasing attention in the last few years. This interest in focused not only in security aspects but also in the development of new services for commercial application. In this Dissertation a simulation environment for mobile stations location in microcellular systems was develop
Publicado em: 2003
-
12. AVALIAÇÃO DE DESEMPENHO DO PROTOCOLO DVB-RCS PARA MÚLTIPLO ACESSO AO CANAL DE SISTEMAS DE COMUNICAÇÃO VIA SATÉLITE / PERFORMANCE EVALUATION OF DVB-RCS PROTOCOL FOR MULTIPLE ACCESS IN SATELLITE COMMUNICATION SYSTEM CHANNELS
In this work, we study the performance of adaptive multiple access protocols used in satellite networks. Firstly a survey of such protocols is presented, describing their basic characteristics and including the main protocols used nowadays. Then, the protocol DVB-RCS is described and analyzed in detail and its applications to an interactive satellite network
Publicado em: 2003