Joint Communication and Sensing Design in Coal Mine Safety Monitoring: 3-D Phase Beamforming for RIS-Assisted Wireless Networks

This article investigates the resource allocation of a reconfigurable intelligent surface (RIS)-aided joint communication and sensing (JCAS) system in coal mine scenario. In JCAS system, an RIS is implemented at corner zigzag tunnels to improve complicated wireless environment, where ground obstacles frequently block direct links. addition, backhaul base station with limited energy budget deployed depth sense target area provide Internet Things (IoT) services for users. Furthermore, data center placed on analyze obtained route data. Under this deployment, optimization problem phase-shift matrix, element switches, time proposed. We aim maximize successful sensed bits under total completion time, maximum transmit power constraints. order solve problem, iterative algorithm The successive convex approximation (SCA)-based used matrix subproblem. For subproblem, quadratic method proposed optimize number perceptions. coordinate descent utilized switches. Simulation results show that efficiency improved by up 38%, 7% increases specific size compared benchmark solutions.