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In healthcare-related human tracking applications for wireless sensor networks, introducing a mobile sensor node into a static node deployment increases its tracking accuracy as the mobile node can move close to the target to obtain more accurate measurements. However this incurs additional energy cost, which is dominated by the energy arising from sensor node mobility, which the authors term mobility energy. Based on their analysis, they propose a mobility algorithm for the mobile node to follow the target depending on separation distance, and they analyze the achievable tracking accuracy with corresponding mobility energy cost.
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