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We study sensor networks with energy harvesting nodes. The generated energyat a node can be stored in a buffer. A sensor node periodically senses a randomfield and generates a packet. These packets are stored in a queue andtransmitted using the energy available at that time at the node. For suchnetworks we develop efficient energy management policies. First, for a singlenode, we obtain policies that are throughput optimal, i.e., the data queuestays stable for the largest possible data rate. Next we obtain energymanagement policies which minimize the mean delay in the queue. We also compareperformance of several easily implementable suboptimal policies. A greedypolicy is identified which, in low SNR regime, is throughput optimal and alsominimizes mean delay. Next using the results for a single node, we developefficient MAC policies.

Efficient Energy Management Policies for Networks with Energy Harvesting Sensor Nodes