Implementation method of mine wireless relay emergency communication system
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摘要: 分析了矿井无线中继应急通信系统特点：无线发射功率受防爆限制，矿井无线传输衰减大，无线传输距离近；在保证井下工作的各无线通信设备互不干扰，出井后不影响地面无线设备正常工作的前提下，工作频段不受限制；中继链路在巷道中呈链状分布，整体网络呈树状拓扑结构。为解决煤矿事故造成断缆（电缆或光缆）影响矿井应急通信系统的问题，提出了矿井无线中继应急通信系统的实现方法：将数据传输链路与协议控制链路分离，可提高链路控制的灵活性和路由协议信令的传输效率；链路中各基站的收/发频段与子信道频率按照基站的物理排列顺序进行设置，解决了各级中继站收发相互干扰的问题；数据链路中继传输，链路中各个中继站可与前级和后级节点进行连续的数据交换，解决了多级中继带来的带宽损失、中继时延以及系统稳定性问题；区段式空间复用的中继站频分子信道划分方式，解决了频分信道资源受限的问题；基于固定节点的透传式路由策略,简化了逐级路由寻址和路由发现过程，提高了数据转发效率；正常链路的冗余基站下挂式路由策略，避免了主节点和冗余节点混合传输带来的信道干扰问题；冗余基站、移动终端桥接、本地接入协同的链路断点恢复方法，提高了链路的抗故障能力。Abstract: The characteristics of the mine wireless relay emergency communication system are analyzed in this study. The wireless transmission power is limited by explosion-proof, the mine wireless transmission attenuation is large, and the wireless transmission distance is short. The working frequency band is not limited on the premise that the wireless communication equipment working underground does not interfere with each other and does not affect the normal operation of the wireless equipment on the ground when being taken out of the mine. The relay links are distributed in a chain in the roadway, and the overall network is in a tree topology. In order to solve the impact of the broken cable (cable or optical cable) caused by the coal mine accident on the mine emergency communication system, the implementation method of mine wireless relay emergency communication system is proposed. This method separates the data transmission link from the protocol control link to improve the flexibility of link control and the transmission efficiency of routing protocol signaling. The receiving/transmitting frequency bands and sub-channel frequencies of each base station in the link are set according to the physical sequence of base stations, which solves the problem of mutual interference between relay stations at all levels. In data link relay transmission, each relay station in the link can exchange data continuously with the front and back nodes, which solves the problems of bandwidth loss, relay delay and system stability caused by multi-level relay. The frequency molecular channel mode of the relay station with spatial multiplexing of zones solves the problem of limited frequency division channel resources. The fixed node-based transparent routing strategy simplifies the level-by-level route addressing and route discovery process and improves data forwarding efficiency. The redundant base station down-link routing strategy of normal link avoids the channel interference problem caused by the mixed transmission of primary and redundant nodes. The link breakpoint recovery method of redundant base stations, mobile terminal bridging and local access coordination improves the anti-fault ability of the link.
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