Node localization using mobile robots in delay-tolerant sensor networks

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Mobile-assisted localization in wireless sensor networks (2005, background): “use a mobile robot to localize RF beacons [30].”
Virtual-Coordinate-Based Delivery-Guaranteed Routing Protocol in Wireless Sensor Networks (2008, background): “In actual practice, a wireless sensor network has unidirectional links because sensors can have different transmission ranges [11], [12], [13], [14], sensors have unstable transmission ranges [4], [15], [16], [17], [18], and a hidden terminal problem exists [14], [19], [20], [21].”
Localization systems for wireless sensor networks (2007, background): “Some recent works [42, 46] have proposed the use of mobile beacons to assist the nodes of the WSN in estimating their positions.”
Cross-layer optimization for energy-efficient wireless communications: a survey (2009, background): “The other important topic to be considered for implementing an efficient mobile grid network is concerning the ability of the system of localizing communication nodes and devices within the operative scenario [50–53].”
The Cricket indoor location system (2005, unknown): “uses RF signal strength measurements collected at a mobile robot to localize RF beacons [69].”