Controlled sink mobility for prolonging wireless sensor networks lifetime

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An Energy-Efficient Mobile-Sink Path Selection Strategy for Wireless Sensor Networks (2014, background): “In general, limitations such as the maximum number of feasible sites [28], maximum distance between feasible sites, and minimum sojourn time [24] govern the movement of a mobile sink.”
Maximizing the Lifetime of Wireless Sensor Networks with Mobile Sink in Delay-Tolerant Applications (2010, background): “Basagni et al. [5], [14] further extended the research of [1].”
The Internet of Things vision: Key features, applications and open issues (2014, background): “, greedy solutions [178], EtE [179], BGR [180], VCCSR [48]) use nodes positions to build network paths, but geographical information is difficult to maintain in mobile networks; and (iii) protocols with mobile sinks/ data collectors [181,42] use additional mobile elements (e.”
Data Collection in Wireless Sensor Networks with Mobile Elements: A Survey (2011, methodology): “For instance, in Chakrabarti et al. [2003], a circular communication range and no message loss during a contact were assumed.”
Energy conservation in wireless sensor networks: A survey (2009, background): “While both [139 and 100] consider centralized approaches, [16] propose a distributed protocol to approximate the optimal scheme.”