Aiming at requirements of high reliability, high bandwidth, low delay and wide coverage of wireless communication in fully-mechanized coal mining face of thin seam, and taking 43101 fully mechanized mining face of thin seam of Yujialiang Coal Mine as application background, WiFi communication scheme applied to fully-mechanized coal mining face of thin seam was proposed from aspects of frequency band selection, network topology, base station layout and fast roaming switching mechanism. 5.8 GHz as the optimal band for WiFi communication was selected. The face has been wired network, WiFi base station directly connected to the wired network. In order to determine distance between WiFi base stations, two test points were selected on the working face for signal strength test, and it was concluded that one WiFi base station should be set at intervals of about 57 supports to achieve overlapping coverage of wireless signals between adjacent WiFi base stations. Based on online scanning, client connection quality sorting, intelligent learning, pre-connection and data caching, the fast roaming switch was completed to ensure that the client on the working face was always connected to the WiFi base station with the best signal. The test results show that the scheme has achieved full coverage of wireless signal on the working face, and has good communication stability. The communication rate is more than 30 Mbit/s, and the roaming switching time is 25-50 ms, so as to achieve goal of fast roaming.
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