Navegando por Assunto "Femtocell"

Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Análise de handover a partir do uso de femtocells em redes LTE: abordagem baseada em simulação discreta
(Universidade Federal do Pará, 2014-06-13) SILVA, Ketyllen da Costa; FRANCÊS, Carlos Renato Lisboa; http://lattes.cnpq.br/7458287841862567
The volume of data traffic in mobile networks is growing exponentially. The explosion of mobile devices and applications in recent years has led to an overload of the network infrastructure responsible for disposing of this traffic, thus affecting the performance of the network as the user experience. One of the key elements in the networks (LTE) Long Term Evolution is the possibility of deploying multiple femtocells for the improvement of coverage and data rate. However, arbitrary overlapping coverage of these cells makes the handover mechanism complex and challenging. Thus, this dissertation proposes a methodology to study the impact of handover in LTE networks with femtocells. From a discrete simulation approach, the effects of the deployment of femtocells were evaluated. This study aimed to measure the impact and correlation of the use of femtocell parameters of QoS (Quality of Service) and performance indicators handover.
Acesso aberto (Open Access)
Green markov - uma abordagem híbrida de política markoviana e simulação discreta para planejamento de alocação de usuários em redes macro-femto
(Universidade Federal do Pará, 2014-10-31) CARDOSO, Jorge Amaro de Sarges; CARDOSO, Diego Lisboa; http://lattes.cnpq.br/0507944343674734; FRANCÊS, Carlos Renato Lisboa; http://lattes.cnpq.br/7458287841862567
The use of voice and data communication via mobile devices has increased significantly in recent years. This expansion brings some difficulties such as: continuous expansion of network capacity and energy efficiency. In this context, has been consolidating the concept of Green Networks, which focuses on the effort to energy saving and CO2 reduction. Thus, this paper proposes validate a model of a policy based on Markov decision process to optimize energy consumption, QoS and QoE, in the allocation of macrocell and femtocell users in networks. For this the model was inserted into the network simulator NS-2, combining the Markov analytical solution to the characteristic flexibility of discrete simulation. From the results presented in the simulation, the policy obtained significant savings in energy consumption, improving energy efficiency by up to 4%, and improve the quality of service in relation to the macrocell and femtocell networks, demonstrating effective in order to directly change the metrics of QoS and QoE.
Acesso aberto (Open Access)
Green-Markov models - new optimization strategies: a case study for user allocation in co-channel macro/femto networks
(2012-12) CARDOSO, Diego Lisboa; SANTANA, Ádamo Lima de; SILVA, Marcelino Silva da; FRANCÊS, Carlos Renato Lisboa; COSTA, João Crisóstomo Weyl Albuquerque; CARVALHO, Solon Venâncio de; VIJAYKUMAR, Nandamudi Lankalapalli
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 on outdated allocation parameters such as signal power level. To this end, this paper presents a proposal for optimized allocation of users on a co-channel macro-femto network, that enable self-configuration and public access, aiming to maximize the quality of service of applications and using more efficiently the available energy, seeking the concept of Green networking. Thus, when the user needs to connect to make a voice or a data call, the mobile phone has to decide which network to connect, using the information of number of connections, the QoS parameters (packet loss and throughput) and the signal power level of each network. For this purpose, the system is modeled as a Markov Decision Process, which is formulated to obtain an optimal policy that can be applied on the mobile phone. The policy created is flexible, allowing different analyzes, and adaptive to the specific characteristics defined by the telephone company. The results show that compared to traditional QoS approaches, the policy proposed here can improve energy efficiency by up to 10%.
Acesso aberto (Open Access)
As redes WLAN serão superadas? Um estudo de viabilidade de redes WLAN em densenets: uma análise baseada em QOS/QOE
(Universidade Federal do Pará, 2015-09-04) CASTILHO, Jessica Janile Monteiro de; ARAUJO, Jasmine Priscyla Leite de; http://lattes.cnpq.br/4001747699670004; FRANCÊS, Carlos Renato Lisboa; http://lattes.cnpq.br/7458287841862567
The proliferation of mobile devices like smartphones and tablets and the changes of user profile caused the exponentially growth of mobile data traffic. Which leads to an overload of network infrastructure responsible for disposing of this traffic. In order to mitigate or even solve this problem some possibility are presented, one of which is the offloading of traffic cellular networks. For this, two technologies have had greater relevance: Femtocell and WLAN. However, the use of Femtocell has been considered panacea. However there is the alternative of WLAN networks, which has a very large legacy infrastructure. In this sense, this work proposes a comparative study through discrete simulation, aiming to analyze the performance of our networks.