WiFi通信在薄煤层综采工作面的应用

针对薄煤层综采工作面对无线通信高可靠性、高带宽、低延时、广覆盖的需求,以榆家梁煤矿43101薄煤层综采工作面为应用背景,从频段选择、网络拓扑、基站布置、快速漫游切换机制等方面提出了应用于薄煤层综采工作面的WiFi通信方案:选择5.8 GHz为WiFi通信优选频段;该工作面已铺设有线网络,WiFi基站直接连接到有线网络;为确定WiFi基站之间的间距,在该工作面选取2个测试点进行信号强度测试,得出需要每隔约57个支架设置1个WiFi基站,实现相邻WiFi基站之间无线信号重叠覆盖;基于在线扫描、客户端链接质量排序、智能学习、预连接、数据缓存5种技术完成快速漫游切换,确保工作面的客户端始终连接最佳信号的WiFi基站。测试结果表明,该方案实现了工作面无线信号全覆盖,具有较好的通信稳定性,通信速率达30 Mbit/s以上,漫游切换时间为25~50 ms,达到快速漫游目的。

Application of WiFi communication in fully-mechanized coal mining face of thin seam

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.