Handover
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Acesso seguro a redes moveis IP / Secure access to mobile IP networks
Os dispositivos de rede sem fio estão cada vez mais populares. Quase todos os dispositivos portáteis atuais possuem uma interface de rede sem fio e pontos de acesso estão acessíveis a baixo custo para uso corporativo e doméstico. No entanto, este aumento no uso de redes sem fio gera novos desafios. O mais crítico deles é com relação à segurança no
Publicado em: 2008
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14. Reducing the rate of fall call GSM mobile network by means of adjustment of parameters of coverage / Redução da taxa de queda de chamada em rede celular GSM por meio de ajustes dos parâmetros de cobertura
A study about the main causes of dropped calls in mobile network cell GSM is made by means of statistical traffic analysis. The aim is to minimize the effect of these causes through coverage parameters changes, such as dynamical potency control, coverage border between cells, correct definition of neighboring cells. The reduction of dropped call rate by mean
Publicado em: 2008
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15. Gerenciamento de políticas de qualidade de serviço com suporte à mobilidade
This work provides a means to ensure the quality of service offered to users independently of their location. To manage the user mobility, it is used the Mobile IPv4 (MIP) architecture, and the QoS methodology used is Differentiated Services (diffserv). The diffserv architecture requires the use o multiple devices that need to be configured properly, and one
Publicado em: 2008
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16. Uma arquitetura baseada em SCTP e SIP para suporte a aplicações VoIP móveis e a especificação formal do seu módulo de controle
New versions of SCTP protocol allow the implementation of handover procedures in the transport layer, as well as the supply of a partially reliable communication service. A communication architecture is proposed herein, integrating SCTP with the session initiation protocol, SIP, besides additional protocols. This architecture is intended to handle voice appl
Publicado em: 2006
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17. Aplicações de antenas inteligentes e equalização concorrente em sistemas WCDMA/HSDPA / Applications of smart antennas and concurrent equalization on WCDMA/HSDPA systems
This dissertation investigates and proposes different algorithms for smart antennas and channel equalization aiming at WCDMA HSDPA downlink receivers. Considering the channel equalization issue, we propose an adaptive back-propagation algorithm with concurrent sub-systems. This equalization technique exploits particular characteristics of a WCDMA downlink si
Publicado em: 2004
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18. SIMULAÇÃO E DESEMPENHO DE SERVIÇO INTEGRADO DE VOZ E DADOS EM SISTEMAS CELULARES UTILIZANDO O PADRÃO GSM/HSCSD / SIMULATION AND PERFORMANCE OF INTEGRATED DATA AND SPEECH SERVICE IN CELULAR SISTEMS USING GSM/HSCSD
Due to the increasing use of cellular networks for data transmission, mobile telephone operators are facing a dramatic raise in using radio resources to supply their demand. As a result, they are being forced to migrate to new technologies that provide high spectral efficiency, allowing an optimized use of available spectrum. This work describes the developm
Publicado em: 2002
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19. MOBILITY MANAGEMENT IN MOBILE CELLULAR COMMUNICATION NETWORS / GERÊNCIA DE MOBILIDADE EM REDES DE COMUNICAÇÃO MÓVEL CELULAR
Nos últimos anos, considerável debate tem ocorrido a respeito do tema gerência de mobilidade, face à necessidade de se fazer uso judicioso dos recursos de sinalização destinados para esse fim no âmbito de sistemas de comunicação móvel celular e de sistemas de comunicação pessoal (PCS). Dentre as estratégias de gerência de mobilidade, destaca-se
Publicado em: 1998
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20. Managing change in the nursing handover from traditional to bedside handover – a case study from Mauritius
BioMed Central.
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21. Retention of information by emergency department staff at ambulance handover: do standardised approaches work?
BMJ Group.
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22. Both ATPase Domains of ClpA Are Critical for Processing of Stable Protein Structures
ClpA is a ring-shaped hexameric chaperone that binds to both ends of the protease ClpP and catalyzes the ATP-dependent unfolding and translocation of substrate proteins through its central pore into the ClpP cylinder. Here we study the relevance of ATP hydrolysis in the two ATPase domains of ClpA. We designed ClpA Walker B variants lacking ATPase activity in
American Society for Biochemistry and Molecular Biology.
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23. A test of 'polymerase handover' as a mechanism for stimulating initiation by RNA polymerase I.
On the tandemly linked ribosomal genes of Xenopus laevis, the RNA polymerase transcribes past the 3' end of the 40S coding region and terminates at T3 just upstream of the gene promoter. The close proximity of T3 to the gene promoter, and the functional interdependence of these two elements, has led to the suggestion that polymerase terminating at T3 might b
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24. Polyomavirus Large T Antigen Binds Cooperatively to Its Multiple Binding Sites in the Viral Origin of DNA Replication
Polyomavirus large T antigen binds to multiple 5′-G(A/G)GGC-3′ pentanucleotide sequences in sites 1/2, A, B, and C within and adjacent to the origin of viral DNA replication on the polyomavirus genome. We asked whether the binding of large T antigen to one of these sites could influence binding to other sites. We discovered that binding to origin DNA is
American Society for Microbiology.