煤矿井下环境存在大量的弯道、岔道、硐室和大型设备遮挡等非视距(Non-Line of Sight,NLOS)场景,导致煤矿井下无线通信覆盖范围受限且盲点和盲区多.在综采工作面等关键场景,无线通信覆盖能力与传输需求的矛盾更为突出.近年来出现的智能超表面(Reconfigurable Intel-ligence Surface,RIS)技术为解决煤矿井下NLOS场景无线覆盖难题提供了新途径和新思路.本文在介绍了 RIS系统结构与特点基础上,讨论了 RIS在煤矿井下巷道、硐室和综采工作面等典型NLOS场景的应用优势,以及需要进一步研究解决的信道测量与建模、近场效应、波束成形和部署规划等关键技术问题与基本思路,为解决煤矿智能化开采所需要的可靠通信技术难题指明了新方向.
Survey of the non-line-of-sight wireless coverage technology by reconfigurable intelligent surfaces in underground coal mines
In underground coal mines,there are a large number of non-line of sight(NLOS)scenarios,such as curves,forks,caverns,and large equipment obstructions,which result in limited wireless coverage and many blind spots.In critical areas such as the comprehensive working face,the conflict between the wireless coverage capability and transmission require-ment is even more apparent.Recently,a novel route to solve this troublesome problem has been provided through an emerging technology-the reconfigurable intelligence surface(RIS).In this paper,RIS's structure and characteristics were introduced,and the RIS's applications ad-vantages were discussed in typical NLOS scenarios in underground coal mines,including the roadways,caverns,and comprehensive work faces.Meanwhile,some key technical issues and basic research ideas were presented,including channel measurement and modeling,near-field effects,beamforming,and deployment programming,which require further investigation and resolution.A new direction was indicated to address the challenges of reliable transmission for intelligent coal mining.
NETL
NSTL
万方数据
