A low-delay medium access control mechanism of WSN for tower crane group

A MAC protocol-wake up one by one MAC (WOO-MAC) for the tower crane group monitoring control system based on WSN (Wireless Sensor Network) is proposed in the paper, which can get low-delay and low-energy consumption. WOO-MAC solves the data forward intermit effectively, which exists in most active/sleep protocols, by waking up the nodes in the data collecting tree one by one. A model of WOO-MAC based on OPNET Modeler is established. The paper compares and analyzes the performance indexes of WOO-MAC with IEEE 802.11 and S-MAC, which includes end-to-end delay, end-to-end throughput and average energy consumption. The simulation results show that WOO-MAC got not only lower energy consumption, but also lower end-to-end delay and higher end-to-end throughput.