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Energy Maps for Mobile Wireless Networks: Coherence Time Versus Spreading Period

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Executive Summary

This paper shows that even though mobile networks are highly unpredictable when viewed at the individual node scale, the end-to-end Quality-of-Service (QoS) metrics can be stationary when the mobile network is viewed in the aggregate. The paper defines the coherence time as the maximum duration for which the end-to-end QoS metric remains roughly constant, and the spreading period as the minimum duration required to spread QoS information to all the nodes. The paper shows that if the coherence time is greater than the spreading period, the end-to-end QoS metric can be tracked. The paper focuses on the energy consumption as the end-to-end QoS metric, and describes a novel method by which an energy map can be constructed and refined in the joint memory of the mobile nodes.

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