In 1997, prior to the introduction of UMTS mobility management, SED provided a turn-key Mobility Management System (MMS) to Inmarsat to allow the users of its B, M, and Mini-M services to access terminals using one Single Network Access Code (SNAC).
Utilizing the terminal’s network registration process, the MMS interfaces with the ground gateways and coordinating stations to obtain, maintain, and distribute mobile location information. Two MMS systems located at opposite sides of the world collect information on terminals located in visible satellite coverage areas. Using a terrestrial inter-connect, the two MMS systems exchange location information to create two complete and replicated global databases. The two MMS systems synchronize the information, via satellite and terrestrial connections, to local databases stored at each gateway, where it is used to route terrestrial-originated requests to the gateway where the terminal connected to obtain service.