Beacon Synchronization-Based Multi-Channel With Dynamic Time Slot Assignment Method of WSNs for Mechanical Vibration Monitoring

Wireless Sensor Networks (WSNs) for mechanical vibration monitoring has been proposed for harsh environment monitoring purposes. However, links congestion makes the realization of reliable and energy-efficient transmission a challenge for such WSNs. To ease bandwidth pressure, a beacon synchronization-based multi-channel with dynamic time slot assignment method is proposed in this paper. Firstly, the network is separated into two opposing groups based on working state to maximize transmission performance. Secondly, the channel is allocated based on interference minimization from adjacent channels. To ensure the two opposing groups work individually, the nodes are synchronously triggered by transmission beacon, then nodes backoff and delay for a period of time to transmit data. Moreover, a dynamic timeslot assignment method is proposed to decrease channel collision. Finally, the experimental results demonstrate that the proposed methods can effectively schedule the network for data transmission via multi-channel, and the channel utilization performs better than CSMA/CA and TDMA.