An Acceleration Method for Ray-Tracing in Modeling Reconfigurable Intelligent Surface Propagation

This paper presents an acceleration method for the reconfigurable intelligent surface (RIS) coverage model based on the image method. The approach constructs multipath clusters on the basis of dynamically partitioning RIS subarrays, significantly reducing the number of rays required for RIS propagation modeling. This compression leads to a model that combines high simulation accuracy with computational efficiency. By simulating a typical RIS propagation process, the proposed acceleration method is analyzed with regard to the relationship between the size of RIS subarrays and prediction accuracy.