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In this paper, the authors propose a sensor mobility control scheme for data delivery in sparse wireless sensor networks. All sensor nodes remain static once they have been deployed but are capable of moving in a controlled manner. Based on periodic beacon messages, local node locations are known to all nodes but are subject to coarse-grained localization error. Each sensor node has a fixed radio range. When a sensor node cannot forward data to a sink, the sensor node solicits aid from neighbors to move suitably to relay the data. If no neighbors can assist, the mobile sensor physically carries the data toward the sink node, the direction being estimated by source node and sink node location data.
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