Survey of the non-line-of-sight wireless coverage technology by reconfigurable intelligent surfaces in underground coal mines
LI Shiyin
YANG Ruixin
YANG Lei
SHEN Shengqiang
LI Feifei
HU Qingsong
Abstract：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.
Keywords：reconfigurable intelligent surfacenon-line-of-sight coveragepassive relayunder-ground coal mine
Publication Date：2024-05-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 613-622 )