Research on safety application technology of coal mine 5G communication system
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摘要: 针对煤矿5G通信系统安全应用需求，研究了5G核心网侧和无线接入侧的安全应用技术。在核心网侧，采用专网技术和网络切片技术实现不同煤矿业务场景的物理隔离，采用比例公平算法优化切片组内的资源块分配，实现切片资源调度，保障煤矿业务数据安全可靠传输；在无线接入侧，设计天线隔离电路实现基站输出信号本安，并将5G基站的射频阈功率限制在6 W内，杜绝由辐射能量滋生的安全隐患，实现多种煤矿井下终端设备的安全接入。井下测试结果表明，5G基站无线覆盖半径为100 m，覆盖范围内信号强度不低于-100 dB，上传速率不低于520 Mbit/s，平均通信时延为18.56 ms，用户个数为200时用户业务性能提升52.8%，在保证通信系统安全可靠的基础上，满足煤矿业务数据多并发、大容量、高速率和低时延无线通信需求。Abstract: According to the safety application requirements of coal mine 5G communication system, the safety application technology of 5G core network side and wireless access side is studied. On the core network side, a private network technology and a network slicing technology are adopted to realize the physical isolation of different coal mine business scenarios. A proportional fair algorithm is adopted to optimize the allocation of resource blocks in a slicing group to realize the slicing resource scheduling and guarantee the safe and reliable transmission of coal mine business data. On the wireless access side, the antenna isolation circuit is designed to realize the intrinsic safety of the output signal of the base station, and the RF threshold power of the 5G base station is limited to 6 W so as to eliminate the potential safety danger caused by radiated energy, and to realize the safe access of a variety of underground mine terminal device. The underground test results show that the wireless coverage radius of the 5G base station is 100 m, the signal strength in the coverage area is not less than 100 dB, the upload rate is not less than 520 Mbit/s, the average communication delay is 18.56 ms, and the user service performance is improved by 52.8% when the number of users is 200. On the basis of ensuring the safety and reliability of the communication system, the 5G base station meets the requirements of multiple concurrency, large capacity, high speed and low delay wireless communication of coal mine business data.
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