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One observe a profound evolution in the communication networks towards the convergence of access technologies. The integration of satellite access with terrestrial mobile networks is enabled by the 3GPP Non-Terrestrial Network (NTN). The satellite network component can contribute to the global service continuity and resiliency of mobile systems. Leveraging the terrestrial 5G access technology, a number of solutions mitigating the issues inherent from satellite communications specifics (e.g. Doppler, delay…) have been standardized in Rel-17 of 3GPP under the so called NTN (Non-Terrestrial Network) standard. In the 5G-Advanced (starting from Rel-18), further NTN added value will be unleashed by the usage of regenerative payload architecture and performance optimization enablers. In the ITU IMT-2030’s vision, the 6G will bring new network capabilities to support the interactions between the human and its physical environment leveraging real time digital modelling. In particular 6G will see the unification of the TN and NTN into a multi-dimensional architecture enabled by a set of innovative technologies and concept at both radio and network levels.