Utilização de nó sorvedouro móvel para balancear a carga de energia em redes de sensores sem fio

• Autor(a) principal: Oliveira, Carlos Eder Ramos de
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2626
• topic: Redes de sensores sem fio; Agricultura de precisão; Wireless sensor networks; Precision agriculture; CNPQ::CIENCIAS EXATAS E DA TERRA::CIENCIA DA COMPUTACAO

This work presents a proposal of using a sink node with the ability to move around the monitored area to extend the lifetime of a Wireless Sensor Network (WSN) exploring the balancing of the energy consumption spent on transmissions from sensors directed to the sink node, as a result of its movement. There are several types of environmental and/or agriculture monitoring applications that may have the sink node embedded in a vehicle and besides mobility, the sink node may have another important characteristic, which is an unlimited power supply provided by the vehicle battery. Considering this type of sink node, we used simulation scenarios with different number of sensor nodes in order to measure the effects caused by different node density in the monitored area. In these scenarios, we considered two different types of mobility for the sink node that were called nomadic or mobile. In simulations we considered the parameters of lifetime and delivery rate, taking into account the percentage of delivered messages and also the total number of delivered messages per time unit. As criteria for stopping the simulation, three situations were considered: the death of half of the sensors of the WSN, caused by energy loss; partial loss of connectivity with the sink node (called brain death) during a time longer than a threshold; and the total loss of connectivity with the sink node.