Data bundling for energy efficient communication of wearable devices

While wearable devices are equipped with small battery, the amount of data that they send and receive has already exceeded the capacity of the energy efficient link technologies (e.g., Bluetooth Low Energy). Existing higher capacity link (e.g., Bluetooth Classic, WiFi) however requires high connection setup cost. To deal with this dilemma, we propose to bundle multiple data transmission requests and send the aggregated data at once to reduce energy consumption for link setup. Where the concept of bundling has been widely used for cloud storage services, existing schemes do not consider energy efficiency. In this paper, we present three bundling algorithms that try to balance the reduction of energy consumption and the extension of delivery delay by adapting to the current data request pattern. We perform extensive evaluation by using the realistic parameters that are obtained via experimental measurements by using a latest commercial smart watch.