ed by advanced flexibility and repro- grammability, seamless global mobility in heterogeneous environments, and support for multiple radio access technologies. In fact, 3GPP clearly states that satellite communications can provide significant benefits in terms of coverage extension, increased network availability, and mobility management [40]. Thus, space net- works can complement and extend terrestrial networks, and its integration can bring many benefits especially in terms of continuity, scalability, service management, reliability, and efficient resource utilization for data delivery [37]. Disruptive architecture concepts must be analyzed for application to high- capacity and high-frequency satellite communications, including links between satellites [37]. Enabling technologies for massive LEO architectures will be pro- posed, as well as the integration of space and terrestrial systems within the framework of 5G networks, considering the characteristics of geostationary systems and constellations of medium and low orbit within the NTN systems defined by the 3GPP [37, 41]. The aim is the design of novel mobility management solutions able to deal with the integrated space-terrestrial system and new radio access networks to support roaming between 5G satellite network and 5G terrestrial network [37]. 7 Vehicular Communications in the B5G Era On the other hand, the implementation of new low-orbit satellite thousand constellation communications systems (massive LEO) requires analyzing a new set of enabling radio technology. There are new system aspects that must be addressed such as interference management. Due to the dynamic nature of the orbits in LEO constellations, connection disruptions occur with both fixed access on earth and across the constellation between neighboring satellites on different planes [mip]. Obtained results [42, 43] demonstrate the high dependency of the mobility management algorithms in the channel model. As aforementioned, the mm-wave spectrum will be a pioneer band to develop B5G/6G wire