A wireless sensor network is a great number of nodes which are micro sensors able to collect and to transmit data in an autonomous way. The wireless sensor networks (WSNs) used in various fields: environmental monitoring, health, protection of the borders, industry, military applications, natural safety, transport, disasters etc. In recent studies undertaken, the sensor nodes are regarded as stationary. This mobility relates to either a sensor node, or an actuator in the case of the networks of

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... sensors/actuators, or the point of collection called Sink. We were interested in the mobility of the sink in the wireless sensor networks for monitoring applications with an aim of data collection in an intelligent and reliable way, and especially of ensuring the safety and the network lifetime. Controlled sink node mobility present a set of algorithms for deciding where and when to move a sink node to improve network lifetime. Moreover, a load-balanced topology construction algorithm is used as another component of our solution. We did extensive simulation experiments to evaluate the performance of the components of our mobility scheme and to compare our solution with static case and random movement strategy.