A radiocommunications system (E) that implements a method for attachment between a mobile radiocommunications network (RM) and a remote radiocommunications network (RD). The infrastructure of each of the mobile radiocommunications network and remote radiocommunications network includes a network supervision (SUPM, SUPD), an application level (NAPM, NAPD) having at least one application (APM, APD), an authentication and mobility management level (NAMM, NAMD) and user terminals (TUM, TUD). A radio management level (NCRM, NCRD) is also included having at least one base station (BSM, BSD).