System for managing the identity of mobile stations roaming between mobile radio networks

A system for managing the identities of mobile stations (MS) roaming between mobile radio networks within a private mobile radio network constituted by one or more base transceiver stations (BTS;

• Node B) and by a reference base station controller (BSC;
• RNC), which realize a normal base station subsystem (BSS;
• RNS) within the public mobile radio network, wherein upon registration of a roaming mobile station (MS) authorised to access the private mobile radio network, the system (Virtual Identity Module (VIM)) simulates, from the base station subsystem (BSS;
• RNS) towards the mobile switching center (MSC) of the competent network switching subsystem (NSS) which comprises an MSC, Home Location Register (HLR), Visitor Location Register (VLR), and an Authentication Center (AuC) within the public mobile radio network, the behavior of the mobile station, whereto it has associated the identity profile selected from a group of identity profiles held by the operator of the visited network, and simulates, from the mobile switching center (MSC) towards the base station subsystem (BSS), the behavior of the competent network switching subsystem (NSS) during the salient steps of the registration of the roaming mobile station, in such a way as to assure the correct execution of the registration procedure itself.