Technique for coordinating CS and PS registrations in a multi-operator core network

A method for coordinating the registration of a terminal in circuit-switched -CS- and packet-switched -PS- domains of a multi-operator core network with multiple core networks, the method comprising:

• receiving at least one registration message requesting registration of a terminal;
• determining whether coordinated CS and PS registrations are required;
• and
• depending on the determination, sending a notification message indicating the requirement of coordinated CS and PS registrations for the terminal.

A device for coordinating the registration of a terminal in circuit-switched -CS- and packet-switched -PS- domains of a multi-operator core network with multiple core networks, the device comprising:

• a first interface adapted to receive, from a first core network, a notification message indicating the requirement of coordinated CS and PS registrations for a terminal;
• a unit adapted to select, based on a global permanent identity associated with the terminal, at least one second core network for coordinated CS and PS registrations;
• and
• a second interface adapted to send at least one registration message for coordinated CS and PS registrations to the selected second core network.

A device for coordinating the registration of a terminal in circuit-switched -CS- and packet-switched -PS- domains of a multi-operator core network with multiple core networks, the device comprising:

• a first interface adapted to receive at least one registration message requesting registration of a terminal;
• a unit adapted to determine whether coordinated CS and PS registrations are required;
• and
• a second interface adapted to send, depending on the determination, a notification message indicating the requirement of coordinated CS and PS registrations for the terminal.