Mine Emergency Communication System Based On Wireless Mesh Networks

With the increase of mining depth and intensity, coal mining safety issueshighlighted in the actual production process. Mine rescue in the11th five-yeardevelopment plan is pointed out: existing in the mine emergency rescue that rescueequipment fall behind, information communication is not free, far can not adapt to thereal need of the mine emergency rescue in our country, the life safety of mine workers,the healthy development of coal industry and even social harmony and stability hascaused adverse impact.In recent years, wireless communication technology develop rapidly, introduce thesuccessful commercial wireless communication technology into underground, it cansupport for mine rescue work of advanced wireless communication technology, toreduce coal mine disasters of property and loss of personnel. This is the starting point ofthis research work.At first, this paper analyzes and compares Wi-Fi, Zigbee, UWB and wireless meshnetwork. And then researched wireless mesh network node type, network structure, keytechnologies and problems, advantages and standardization progress. According to thecharacteristics of emergency communication requirements and underground tunnels, putforward a mine emergency communication system based on wireless mesh networkrequirements for emergency communication and the characteristics of the mine roadway.Then analyzes the network topology structure、application types and the application ofsystem environment. Based on the methodology of existing CSMA protocol, this paperproposes mixture dynamic probability CSMA protocol. Simulation results show that theprotocol can get good throughput performance under different network load status. Inview of the coal mine roadway characteristics of limited space, long and narrow chain,this paper present a kind of proactive routing protocol, called tree topology routingprotocol, then described the protocol in detail,at last test the networking and accessfunction.