“…1) seamless integration of space and terrestrial segment on an equal basis, where satellites and space nodes work in synergy with the wireless terrestrial infrastructures to provide global and ubiquitous coverage; 2) flexibility and reconfigurability of the space network that should become a "whole," characterized by adaptability to the context and the user needs (and, therefore, provided by intrinsic "intelligence" [3]); 3) sustainability: the space network of the future should rely on a responsible use of the payload resources by promoting a "green" approach based on the resource reusing and recycling.…”