less mobile communications, for terrestrial and space applications. The incipient development of mm-wave B5G/6G communications will require disruptive technologies to successfully fulfill the expected features and, finally, the study of new case uses and applications. In this scenario, radio propagation behavior acquires a new dimension, and its proper modeling will contribute to ensuring the expected B5G/6G capacity [40]. The vehicle-to-satellite use case (V2S) is yet to be defined. The characterization of the mobile radio channels envisioned in B5G/6G systems for V2X use case, terrestrial or space, at millimeter frequency bands with high bandwidths, requires considering their highly changing temporal and spatial variability [42, 43]. Now the assumed condition of stationarity and uncorrelation is not fulfilled for most of the applications due to double mobility at the ends of the radio link, terrestrial or space, and forces us to rethink the existing radio channel models in order to account for the specific features. Far from considering that the demand for radio channel characterization is complete, the results obtained also indicate that there are still many open research questions that are pending response [19]. One of those questions is the demand for developing more complex channel models that try to reflect as many possible propagation mechanisms and impairments taking place in vehicular communication [19], under the new scenario of the satellite segment. 7.4 Vehicular Wireless Communication Link Case Study In order to gain insight in relation to performance metrics in relation with wireless channel behavior, a vehicular scenario communication link case study operating at 28 GHz frequency has been performed by means of an in-house three-dimensional ray-launching (3D-RL) code. By means of deterministic techniques such as the 3D- RL software, large- and small-scale propagation characterization can be performed. The 3D-RL algorithm is based on geometrical optics (GO) and the uniform theory of diffraction (UTD