The paper examines a network with K ground nodes (GNs) and a base station (BS), where a rotary-wing UAV equipped with either an RIS or an FDR acts as an intermediate node to establish line-of-sight communication between the GNs and the BS. The authors devise appropriate energy consumption models for both UAV-mounted RIS and UAV-mounted FDR that capture the relationship between factors like weight, flight duration, and the operational needs of RISs and FDRs in terms of energy.
The authors formulate a joint time division multiple access (TDMA) user scheduling and UAV trajectory optimization problem that accounts for the power dynamics associated with both RIS and FDR technologies. The problem is solved using a combination of alternate optimization and successive convex optimization techniques.
The simulation results demonstrate that for UAV-mounted RIS, increasing the number of reflecting elements does not necessarily translate into improved performance due to the added weight, which limits the UAV's operational flight time. In contrast, the UAV-mounted FDR consistently outperforms the nearly passive RIS, highlighting the key role of UAV motors and the associated weight in overall UAV energy consumption. The results also emphasize the crucial role of the UAV's battery capacity in trajectory optimization, directly influencing the optimal trajectory and necessitating UAV movement only when essential for minimizing energy consumption during traversal.
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by Dimitrios Ty... alle arxiv.org 04-16-2024
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