State updating method based on truncation automatic retransmission in cognitive relay Internet of Things

The invention discloses a state updating method based on truncation automatic retransmission in a cognitive relay internet of things. The method comprises the steps of transmitting power control, data packet structure design, truncation automatic retransmission scheme design, iterative optimization of data packet length and retransmission times, and data packet sending for state updating. The influence of outdated channel state information and short data packet characteristics on system state updating is comprehensively considered, so that the model can more accurately describe the state updating process in the actual cognitive relay Internet of Things system. In the aspect of improving the state updating performance of the system, on one hand, the coverage range and the transmission reliability of the system are improved by utilizing a cognitive Internet of Things relay and a truncation automatic retransmission protocol, and the utilization performance of spectrum resources is improved; on the other hand, th