epts can also be applied to the UE antenna arrays. In this case MXN antenna panels may have different orientations. Let denote the orientation angles of the panel (mg,ng) < 0 ng <Ng, where the orientation of the first panel (520,0,00,0) is defined as the UE orientation, Smagng is the array bearing angle, and Omg,ng is the array downtilt angle. The antenna bearing is defined as the angle between the main antenna lobe center and a line directed toward east. The bearing angle increases in a clockwise direction. The parameters of the base station antenna array pattern for Dense- urban-eMBB (macro-TRP), Rural-eMBB, Urban-macro-mMTC, and Urban-macro-URLLO test environments (i.e., deployment scenarios studied in 3GPP and ITU-R5) are defined as 03dB = = 65°, Otilt==00, = am = 30 dB. The parameters of the UE antenna pattern for frequencies above 30 GHz are given as 03dB = =90°, Otilt==00, = and am = 25 dB. The IMT-2020 3D channel model developed in ITU-R is a geometry-based stochastic chan- nel model. It does not explicitly specify the location of the scatterers, rather the directions of the rays. Geometry-based modeling of the radio channels enables separation of propaga- tion parameters and antennas. The channel parameters for individual snapshots are deter- mined stochastically based on statistical distributions obtained from channel measurements. Channel realizations are generated through the application of the geometrical principle by summing contributions of rays with specific small-scale parameters such as delay, power, azimuth angles of arrival and departure, and elevation angles of arrival and departure. The results are further combined with transmit/receive antenna correlations and temporal fading with geometry-dependent Doppler spectrum effects [4]. A single-link channel model is shown in Fig. 3.8 for the downlink direction. Each circle with several dots represents scat- tering region creating one cluster, each cluster is constituted by M rays, where a total of N clusters are assumed. We assume that there are N