Long distance wireless sensor networks applied in coal mine

To remedy the deficiency of the present monitoring systems in coal mine, this paper designs the integrated mine network composed of wireless sensor networks and other technologies, and analyzes the problems of wireless sensor networks applied in long distance roadway. Different from wireless sensor networks in common wide area environment, topology of network in long roadway is zonal structure, which leads the nodes near Sink to have high energy consumption and become “bottleneck node”. To improve the bottleneck phenomenon, strategies of uneven fixed cluster and Mixed routing based on the features of long roadway are proposed. Simulation based on Matlab shows that these strategies balance the global energy consumption and have a better performance on the network lifetime and connectivity, which proves they are suitable for mine environment.