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This paper presents a routing scheme for wireless sensor networks. It uses an aggregation tree for sending the data from the sensor node to the base station. For an energy efficient operation of the sensor network in a distributed manner, an aggregation tree is built in order to minimize the total energy required to send data from the individual sensor nodes to the base station. An aggregation tree is a data gathering tree where the base station is the root and each sensor node is either a relaying or a leaf node of the tree. Through simulation, it found that the routing scheme that uses aggregation trees shows longer-lived characteristics when compared with other routing schemes.
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