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Summary: LOCI: Local Clustering Service
for Large Scale Wireless Sensor Networks
Vineet Mittal Murat Demirbas Anish Arora
Department of Computer & Information Science
The Ohio State University
2015 Neil Avenue, Dreese Lab 395
Columbus, Ohio 43210 USA
Abstract
We present a local, scalable, and fault-tolerant distributed clustering service, LOCI, that
partitions a multi-hop wireless network into clusters of bounded physical radius [Ê ÑÊ]
where Ñ is a constant greater than or equal to ¾. That is, each cluster has a leader node
such that all nodes within distance Ê of the leader belong to the cluster but no node beyond
distance ÑÊ from the leader belongs to the cluster.
LOCI is local in that each node only needs information about nodes that are at most dis-
tance ¾Ê away. It is scalable in that each node maintains only a constant amount of state and
completes its role in clustering in Ç´Ê µ time (Ǵʾ
µ for a stronger system model), indepen-
dent of the network size. It is fault-tolerant in that it is self-stabilizing in the presence of state
corruption, node and link fail-stops, and node joins.
The network partitions generated by LOCI form a Voronoi tessellation as each non-clusterhead
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