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This paper investigates an aerial reconfigurable intelligent surface(RIS)-aided communication system under the probabilistic line-of-sight (LoS)channel, where an unmanned aerial vehicle (UAV) equipped with an RIS isdeployed to assist two ground nodes in their information exchange. Anoptimization problem with the objective of maximizing the minimum averageachievable rate is formulated to jointly design the communication scheduling,the RIS's phase shift, and the three-dimensional (3D) UAV trajectory. To solvesuch a non-convex problem, we propose an efficient iterative algorithm toobtain its suboptimal solution. Simulation results show that our proposeddesign significantly outperforms the existing schemes and provides new insightsinto the elevation angle and distance trade-off for the UAV-borne RIScommunication system.

Elevation Angle-Dependent 3D Trajectory Design for Aerial RIS-aided Communication