DispersiveCast: Dispersive Packets Transmission to Multiple sinks for Energy Saving in Sensor Networks

This paper proposes two schemes for wireless sensor networks with multiple sinks in order to save battery energy and to improve network lifetime performance. In these schemes, each sensor node transmits sensing data to randomly chosen sink according to the sending rates. These schemes are referred to as DispersiveCast. The first decentralized scheme called B-DOP scheme (basic DispersiveCast of packet), enables each sensor node to derive locally the sending rate by the number of hops to sinks. The second one is O-DOP scheme (optimal DispersiveCast of packet) that is partially centralized than B-DOP. In O-DOP, sinks send the information to nodes so as for them to calculate the optimal sending rates. DispersiveCast is effective when the generate rate of sensing data at every sensor node geographical nonuniformity. In such a situation, batteries of nodes in the specific area deplete fast and others late, which causes partial depletion of the entire network. As a result, network lifetime can not be extended sufficiently. We evaluate the DispersiveCast schemes by simulations for several network topologies and show that DispersiveCast scheme prolongs the network lifetime compared with the conventional nearest sink scheme, especially O-DOP can achieve 1.5 times longer