Required Orders of Interaction for Accurate Ray Tracing Simulations in mm-Wave Indoor Scenarios

This paper investigates the required amount of orders of interaction to obtain accurate ray tracing (RT) simulations for line-of-sight (LOS) and non-line-of-sight (NLOS) mmwave indoor scenarios. For this purpose, RT simulations with varying orders of interaction, from one to six, are analyzed and compared with previously conducted channel measurements of a kitchen scenario at 28 GHz. Most importantly, all relevant interaction mechanisms, i.e. reflections, diffractions and scattering, are utilized and varied for the comparison and analysis. It is shown, that three to five orders of interaction, for LOS and NLOS scenarios respectively, are needed for the best possible agreement between measurements and RT simulations. Any further increase of the orders of interaction only increases the computational complexity of the simulations without providing any relevant improvements for the respective scenarios.