SCAP: Energy Efficient Event Detection in Large-Scale Wireless Sensor Networks with Multiple Sinks

Jungmin SO  Heejung BYUN  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.4   pp.1435-1438
Publication Date: 2012/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.1435
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
aggregation,  routing,  energy-efficiency,  self-clustering,  

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For large-scale sensor networks, multiple sinks are often deployed in order to reduce source-to-sink distance and thus cost of data delivery. However, having multiple sinks may work against cost reduction, because routes from sources can diverge towards different sinks which reduces the benefit of in-network data aggregation. In this letter we propose a self-clustering data aggregation protocol (SCAP) that can benefit from having multiple sinks as well as joint routes. In SCAP, nodes which detect the event communicate with each other to aggregate data between themselves, before sending the data to the sinks. The self-clustering extends network lifetime by reducing energy consumption of nodes near the sinks, because the number of paths in which the packets are delivered is reduced. A performance comparison with existing protocols L-PEDAP and LEO shows that SCAP can conserve energy and extend network lifetime significantly, in a multi-sink environment.