Research on MAC Layer Communication Performance Model of Wireless Sensor Networks for Intelligent Transportation

With the development of MEMS (Micro-electromechanical Systems), the wireless sensor networks (WSNs) have become an important communicating method for intelligent transportation application. Mathematics modeling, as an effective quantitative analysis method, is very important for conducting intelligent transportation performance research when WSNs are applied. Based on the channel contention mechanism of IEEE802.15.4 standard Media Access Control (MAC) layer unslotted mode, MAC layer mathematics performance model of throughput, goodput, average delay and collis ion rate is built by analyzing the state of node buffer, state of nodes, and the state of channel. In addtion, the MAC layer mathematics models and corresponding performance are simulated in MATLAB and QualNet respec tively. The simulation results indicate that the mathematics models can be used for the real communication quantitative analysis of WSNs MAC layer communication.