Privacy preserving rechargeable battery policies for smart metering systems

We consider a setup where a rechargeable battery is used to partially mask the load profile of a user from the utility provider in a smart-metered electrical system. We focus on the case of i.i.d. load profile, use mutual information as our privacy metric, and characterize the optimal policy as well as the associated leakage rate. Our approach is based on obtaining single-letter expression for the leakage rate for a class of battery policies and providing a converse argument for establishing the optimality.

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