An Adaptive Energy Efficient Emergency Packet Transmission Scheme in Medical Implant Communication

In order to find out current operating channel of the hub during emergency in implant communication, a node sequentially sends an empty frame in all the available channels until it receives an acknowledgement. This type of transmission technique, however, adds higher overhead if the correct channel selection probability is high and/or payload size to transmit is small. In such instance, the direct data transmission technique (i.e. without empty frame in advance) could exhibit better performance. In this paper, to save energy from inappropriate transmission attempt, we propose to use these two transmission schemes adaptively. Nodes will select the transmission mode by taking into account the probability of successful transmission and the payload size. We find payload threshold value that serves as switching criterion between two schemes during various network scenarios.