EuCNC 2018 is the 27th edition of a successful series of a technical conference in the field of telecommunications, supported by the European Commission. The conference focuses on aspects like 5G communications systems and networks, cloud platforms, management technologies, experimentation and testbeds, and applications and services. It targets to bring together researchers from all over the world to present the latest research results, and it is one of the main venues for showcasing (demonstrating, trialling) the results of research projects, especially, from successive European R&D programmes co-financed by the European Commission.