Research On MAC Layer Optimization Method Based On IOT Intelligence Transaction Network

With the rapid development of civil aviation in china, the burden of airport surface movement guidance and control is increasingly heavy and the intelligent airport network which based on internet of things(IOT) will be development tendency of the future. Zigbee would be quite helpful in the field of reasonable control vehicles with the advantage of low-consumption, cheap cost and self-organization, reducing the accidents which caused by airport chocking when using it in the airport monitoring network.At first how Zigbee worked in IOT is introduced in brief in this paper, the working theory and classifying rules of MAC are also discussed, then introduce the details and steps of standard CSMA/CA mechanism. The throughput, network delay and packet loss probability are simulated by NS2 about the influence of different NB, CW, BE parameters. The conclusion of this simulation proved the basis of reasonably change parameters. Because standard mechanism can't support the request of the network's emergency information preferentially deliver, according to the fusion of modified BE method, the research of emergency event scheduling and the method of probability scheduling, the modified CSMA/CA mechanism which based on priority thought is proposed and the theory and realization process are also described. At the same time, the Markov chain of this algorithm is built to analyze the influence of the throughput and consumption of notes caused by the modified CSMA/CA mechanism which based on priority thought on NS2. At last, through the analysis of the simulation the modified algorithm could save energy in the meantime priory transfer information during emergency events which ultimately prolong the life cycle of the net.