I. Introduction
Widespread development of the Internet-of-Things (IoT) and low-power wireless technologies has led to profound interest in wireless body area networks (BANs). A BAN is composed of multiple nodes of very low-power, short-range sensors, sending and receiving data through wireless technologies. The sensors collect data from their surrounding environments, such as temperature, pressure, humidity or physiological conditions from a human body. Primary applications of BANs are in the healthcare domain, e.g., for ubiquitous monitoring of patients with chronic disease such as heart attack; but other use cases include military and sports.