A study for the adaptive error correction using QoS-HARQ toward dependable implant body area network

In this paper, we apply HARQ to a wireless feedback control system for realizing high dependable communication. We assume that a controller transmits packets of controlled variables through the propagation channel equivalent with the IEEE 802.15.6 CM2 using some punctured convolutional codes whose code rate is different each other. We propose QoS-HARQ which changes the code rate responding to the status of a rotary inverted pendulum before application for an implant medical actuator device. As a result, we confirm by computer simulations that our proposal can reduce the redundant bits in a packet while keeping the rotary inverted pendulum stable.