Optimal Rate Allocation for Rate-Constrained Applications in Wireless Sensor Networks

Authors:
Chun Lung Lin;Hai Fu Wang;Sheng Kai Chang;Jia Shung Wang
Affiliations:
Department of Computer Science, National Tsing Hua Univeristy, Hsinchu, Taiwan 30043;Department of Computer Science, National Tsing Hua Univeristy, Hsinchu, Taiwan 30043;Department of Computer Science, National Tsing Hua Univeristy, Hsinchu, Taiwan 30043;Department of Computer Science, National Tsing Hua Univeristy, Hsinchu, Taiwan 30043
Venue:
DCOSS '08 Proceedings of the 4th IEEE international conference on Distributed Computing in Sensor Systems
Year:
2008

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Abstract

This paper addresses the optimal rate allocation (ORA) problem as follows: given a target bit rate constraint, determine an optimal rate allocation among sensors such that the overall distortion of the reproduction data is minimized. Optimal rate allocation algorithms are proposed to determine the coding bit rate of each sensor in single hop and multihop sensor networks, given a target rate constraint. Extensive simulations are conducted by using temperature readings of the real world dataset. The results show that at low bit rates the optimal rate allocation improves about 2.745 dB on the uniform rate allocation in terms of SNR, and improves nearly 7.602 in terms of MSE. Spatial-temporal range queries are also evaluated to confirm that our approach is often sufficient to provide approximate statistics for range queries.