基于三频组网的4.9 GHz时隙翻转技术在西湾煤矿的应用

Application of 4.9 GHz Timeslot Flipping Technology Based on Triple-frequency Networking in Xiwan Coal Mine

西湾煤矿的“无人驾驶+远程驾驶”运输业务需要在煤矿轻载试验区、重载试验区和全采区实现上行大带宽、低时延的无线网络三维立体覆盖。针对其采煤区站点落地难、站点搬迁频次高、无线环境复杂的情况,文章提出了一种“700 MHz+2.6 GHz+4.9 GHz”三频组网方案,有效解决了煤矿全采区安全、稳定、高效的5G网络覆盖问题,满足了“无人驾驶+远程驾驶”的带宽、时延业务需求;同时,为了进一步提升采煤区(煤顶板、石顶板)的带宽,提出了4.9 GHz时隙翻转1D3U方案,即将3个下行时隙改为上行时隙,使得下行时隙与上行时隙的占比由5∶3变为1∶3。三频组网方案实施后,煤矿整个业务区上行边缘速率50 Mbit/s的占比大于99%,平均时延小于20 ms;4.9 GHz时隙翻转1D3U方案实施后,核心业务区采煤区上行峰值速率由原来的290 Mbit/s提升至600 Mbit/s左右,拓展了上行带宽。

Unmanned driving & remote driving transportation business in Xiwan Coal Mine requires three-dimensional coverage of wireless network with large bandwidth and low latency in light-load test area, heavy-load test area and whole mining area. In view of the difficulties of site landing, high frequency of site relocation and complex wireless environment in coal mining area, this paper puts forward a scheme of "700 MHz+2.6 GHz+4.9 GHz" triple frequency networking, which effectively solves the problem of safe, stable and efficient 5G network coverage in the whole mining area, and meets the bandwidth and delay business needs of unmanned driving&remote driving. At the same time, in order to further enhance the bandwidth of coal mining area (coal roof, stone roof), a 4.9 GHz time slot flip 1D3U scheme is proposed, which changes three downward time slots to uphill time slots, making the proportion of downward timeslot to uphill time slot from 5:3 to 1:3. After the implementation of the triple-frequency networking scheme, the proportion 50 Mbit/s upstream edge rate in the whole coal mine business area is more than 99%, and the average time delay is less than 20 ms. After the implementation of the 4.9 GHz timeslot flip 1D3U scheme, the peak rate of ascending in the core mine area increased from 290 Mbit/s to around 600 Mbit/s, which expanded the upstream bandwidth.