Collaborating with correlation for energy efficient WSN

Authors:
Milen Nikolov;Zygmunt J. Haas
Affiliations:
Cornell University, Ithaca, NY, USA;Cornell University, Ithaca, NY, USA
Venue:
Proceedings of the first ACM international workshop on Mission-oriented wireless sensor networking
Year:
2012

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Abstract

This paper describes a novel approach for collaboration in WSN that substantially reduces energy expenditure in the network by exploiting spatial correlation among nodes. The idea behind the scheme is that the whole range of measurements is partitioned into individual intervals, with each interval assigned to a unique subset of nodes. Each node needs only to determine whether its measured value falls within its assigned interval and transmit a binary decision to the sink. The base station, after gathering the responses of sufficiently large number of nodes, calculates the actual measurement value. This division of responsibilities across the network nodes enables our scheme to utilize collaborative transmissions by spatially clustered and highly correlated nodes. While maintaining a similar distortion level, the proposed scheme achieves in the worst case close to a factor of 2 in energy savings, compared to the standard approach of transmission of the measurement by a single node. The results are derived analytically, evaluated numerically, and confirmed by simulations.