Lifetime Elongation of Wireless Sensor Networks with Mobile Sink in Delay-Sensitive Applications

Mobile sinks are useful in mitigating the formation of energy-holes due to uneven energy expenditure among sensor nodes in a Wireless Sensor Network (WSN). A mobile sink travels across WSN and gathers sensor readings via single-hop communication. To deal with data collection latency in delay-sensitive applications, many proposals have investigated techniques based on Rendezvous Points (RPs) where a mobile sink plans a tour that visits a subset of sensor nodes to collect data within a given deadline. In such a WSN, the number of RPs is limited due to the maximum allowed sink tour length. Therefore, in a large WSN, selected RPs are required to forward a large number of packets, which results in early energy depletion. In this paper, we have proposed an approach that attempts to lessen the RP’s burden of forwarding large number of data packets in such WSNs.

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