A Power-Variation Model for Sensor Node and the Impact against Life Time of Wireless Sensor Networks

We introduce manufacturing variation into a power model for a wireless sensor network node. Network protocols for the wireless sensor networks such as media access control and routing should be evaluated in terms of life time in a whole system. In fact, there exists power variation node by node due to the manufacturing variation. In the previous researches, however, this effect has not been investigated at all since it has been supposed that all nodes have a same power. In this paper, we develop a power model for a sensor node, in which we consider threshold-voltage variation derived from a manufacturing process. We take both a microprocessor and an RF part into account for the model, and implement it to QualNet in order to evaluate the impact against a life time of a wireless sensor network. The simulation results show that the conventional model has overestimated the life time longer than our model when nodes are randomly deployed. In contrast, if we make an optimum deployment of nodes by exploiting the power variation, the network life time is extended by 12.7% compared to the case of the conventional model.

[1]  Hiroshi Kawaguchi,et al.  Low-power CMOS design through VTH control and low-swing circuits , 1997, ISLPED '97.

[2]  A. R. Newton,et al.  Alpha-power law MOSFET model and its applications to CMOS inverter delay and other formulas , 1990 .

[3]  A. Chandrakasan,et al.  Power aware wireless microsensor systems , 2002, Proceedings of the 28th European Solid-State Circuits Conference.

[4]  Vivek De,et al.  Adaptive body bias for reducing impacts of die-to-die and within-die parameter variations on microprocessor frequency and leakage , 2002, 2002 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.02CH37315).

[5]  David E. Culler,et al.  Mica: A Wireless Platform for Deeply Embedded Networks , 2002, IEEE Micro.

[6]  F. J. Kratochvil.  A 0.25-μm CMOS 0.9-V 100-MHz DSP Core , 1997 .

[7]  Suresh Singh,et al.  PAMAS—power aware multi-access protocol with signalling for ad hoc networks , 1998, CCRV.

[8]  Wendi Heinzelman,et al.  Energy-efficient communication protocol for wireless microsensor networks , 2000, Proceedings of the 33rd Annual Hawaii International Conference on System Sciences.