Navegando por Assunto "Heterogeneous networks"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Eficiência energética em redes sustentáveis: uma avaliação baseada em redes small cells e backhaul
(Universidade Federal do Pará, 2015-03-13) LOPES, Albert Richard Moraes; COSTA, João Crisóstomo Weyl Albuquerque; http://lattes.cnpq.br/0255430734381362
The use of small cells in heterogeneous networks (either 3G, 4G and 5G future) for indoor traffic has been regarded as the best solution to meet the growth of mobile traffic due to reduce network power consumption and to guarantee the high capacities. Moreover, increasing the amount of small cell deployment implies in the expansion of the backhaul network, which causes an increase on the network power consumption, and threatens the small cells gains in terms of energy. Furthermore, the energy consumption in heterogeneous network can increase considerably depending on the choice of the type backhauling. Considering this background, this work aims to provide a methodology to assess and identify possible energy consumption bottlenecks in the mobile network, considering both the wireless part as the backhaul infrastructure. The methodology considers the demand of traffic generated in the city, scenario to implementation and operation of heterogeneous networks (small cells), and dimensioning backhaul by segment (Cell Site, Hub Site e Central Office). Adopting this methodology, the study evaluates and compares three types of backhaul architecture for conventional Femtocell or Femtocell Wireless over Cable (FemtoWoC) network: Fiber-to-the-Building, Fiber-to-the-Curb e Fiber-to-the-Home. It was found that the main bottleneck in the backhaul architecture is the segment that is responsible for aggregating traffic from small cells (Cell Site). However, adopt architectures and equipment with high energy efficiency, as FemtoWoC, in the segment bottleneck reduce significantly the total power consumption in the backhaul, mainly architectures based on copper in the last mile.
Acesso aberto (Open Access)
Gerenciamento de mobilidade transparente com suporte integrado a QoS/QoE em redes heterogêneas
(Universidade Federal do Pará, 2012-02-29) SILVA JUNIOR, Reinaldo Boulhosa Ramos da; CERQUEIRA, Eduardo Coelho; http://lattes.cnpq.br/1028151705135221
Advances in wireless communications technology, and the demands for new real-time multimedia applications that meet the Quality of Service (QoS) and Quality of Experience (QoE) requirements, together with the proliferation of mobile equipment, have given rise to new solutions that allow horizontal and vertical mobility in transparent heterogeneous networks. These mobile devices have multiple wireless interfaces where the users are connected so that they can carry out several tasks and services on a daily basis through the technology of different networks that allow a heterogeneous scenario with a wide range of connectivity opportunities for the mobile users. This dissertation sets out a fast decision hierarchical technique for transparent mobility based on cost function in the IEEE 802.21 Standard and class-of-service mapping, to ensure QoS/QoE for the users in periods of mobility called M1H2Q, during which this policy gives information about the best network that can be used for the service employed by the mobile user. It seeks to overcome the problem of having several connections being made by mobile users on the same Wireless Fidelity (wi-fi) network and/or WiMAX (Worldwide Interoperability for Microwave Access) with different services being executed, even though the network is not used correctly. The effects and benefits of the scheme were assessed through NS-2 simulation (Network Simulator- Version 2) and Evalvid, and the QoS and QoE metrics were used to check the results.
Acesso aberto (Open Access)
QoE and QoS-aware handover for vídeo transmission in heterogeneous vehicular networks
(Universidade Federal do Pará, 2018-03-19) MEDEIROS, Iago Lins de; CERQUEIRA, Eduardo Coelho; http://lattes.cnpq.br/1028151705135221
Vehicle Ad Hoc Networks (VANETs) offer a wide range of multimedia services ranging from safety and traffic warnings to entertainment and advertising videos. In this context, users can access content through vehicle-to-infrastructure (V2I) communication, which may consider different wireless networks, such as, LTE, Wi-Fi, etc. However, video streaming at a VANET with Quality of Experience (QoE) and Quality of Service (QoS) is a challenging task, due to the high vehicle’s mobility that causes communication failure with the infrastructure. To mitigate such factors, this master’s dissertation presents a handover algorithm that considers QoE, Quality of Service (QoS) and channel quality in heterogeneous networks, known as handover aware of Quality of Service, Experience and Radio (SER). The proposed algorithm considers the Analytic Hierarchy Process (AHP) to adjust the degree of importance of each criteria in choosing the appropriate radio base station that the mobile node must connect to, allowing a more efficient handover decision for video transmission with QoE support. Simulation results show that SER handover delivered videos with QoE 15 % better compared to the algorithms found in the literature.