Wireless Multi-Hop Networking for a Group of Exercisers Spread in a Sports Ground

Reliable and real-time vital signs monitoring is essential to promote health and prevent disease/injury for a group of exercisers spread in a sports ground such as schoolchildren and professional athletes. For that purpose, we developed a wireless vital signs collection system and confirmed it worked effectively, but unfortunately, it required an infrastructure of data forwarding nodes placed around the area of interest. We really wanted to realize it infrastructurelessly.Now, we are developing an infrastructureless multi-hop wireless network system which has the same vital sensing and wireless communication functions, and we have so far successfully conducted one indoor experiment and two outdoor experiments for footballer subjects. In this paper, we will outline the design concept and show the experimental results.