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Optimizing transmission cycle for energy efficiency of body worn gateway node

Energy efficiency is an important concern in wearable wireless body sensors and body sensor networks used in healthcare. Sensor nodes with high traffic and particularly the gateway nodes, aggregate the data before further transmission. Managing the data aggregation on gateway node and transmission duty cycle can be a convenient way of tweaking the energy consumption of the node in a wearable healthcare sensor system. In this paper we focus on optimizing energy consumption of a continuous health monitoring gateway sensor node while meeting the medical requirements of low latency. We show that this problem can be posed as a geometric program, which belongs to class of convex optimization problems. We analyze the issue based on energy consumption in different states of latency constraints and data bandwidth availability. The results are mapped to different data type specifications and conclusions are drawn for optimal data aggregation at the gateway node.