I. Introduction
Body Sensor Network (BSN) is a branch of Wireless Sensor Networks (WSNs), which is playing an important role in various applications such as healthcare, social welfare, military and sports. Healthcare monitoring is one of the most challenging applications because having an efficient wireless communication not only reduces the maintenance cost, but also gives the patients more freedom and comfort [1]–[5]. Therefore, facilitating mobile healthcare through wireless communication technologies can help physicians to perform early and accurate diagnosis. As a result, BSNs have become an essential research hotspot.