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As many sensor network applications require deployment in remote andhard-to-reach areas, it is critical to ensure that such networks are capable ofoperating unattended for long durations. Consequently, the concept of usingnodes with energy replenishment capabilities has been gaining popularity.However, new techniques and protocols must be developed to maximize theperformance of sensor networks with energy replenishment. Here, we analyzelimits of the performance of sensor nodes with limited energy, beingreplenished at a variable rate. We provide a simple localized energy managementscheme that achieves a performance close to that with an unlimited energysource, and at the same time keeps the probability of complete batterydischarge low. Based on the insights developed, we address the problem ofenergy management for energy-replenishing nodes with finite battery and finitedata buffer capacities. To this end, we give an energy management scheme thatachieves the optimal utility asymptotically while keeping both the batterydischarge and data loss probabilities low.

Basic Performance Limits and Tradeoffs in Energy Harvesting Sensor Nodes with Finite Data and Energy Storage