Mobility

Dewdrop: An Energy-Aware Runtime for Computational RFID

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Executive Summary

Computational RFID (CRFID) tags embed sensing and computation into the physical world. The operation of the tags is limited by the RF energy that can be harvested from a nearby power source. The authors present a CRFID runtime, Dewdrop that makes effective use of the harvested energy. Dewdrop treats iterative tasks as a scheduling problem to balance task demands with available energy, both of which vary over time. It adapts the start time of the next task iteration to consistently run well over a range of distances between tags and a power source, for different numbers of tags in the vicinity, and for light and heavy tasks. They have implemented Dewdrop on top of the WISP CRFID tag.

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