Abstract: In one of its aspects, the present invention provides a method of improving the management of mobility in a cellular mobile communications system in which cells are grouped together in location structures comprising cells that support different radio access technologies, said method comprising steps in which: a mobile terminal (MT) in a given cell sends (1) to a network entity (CN) a request to register in a location structure including said cell; and on receiving said request, said network entity (CN) transmits (2) to the mobile terminal (MT) a reply including at least one radio access technology (RAT) indication relating to at least one radio access technology that is authorized and/or to at least one radio access technology that is not authorized for said mobile terminal, at least in said location structure.

Abstract: In one of its aspects, the present invention provides a method of improving the management of mobility in a cellular mobile communications system in which cells are grouped together in location structures comprising cells that support different radio access technologies, said method comprising steps in which: a mobile terminal (MT) in a given cell sends (1) to a network entity (CN) a request to register in a location structure including said cell; and on receiving said request, said network entity (CN) transmits (2) to the mobile terminal (MT) a reply including at least one radio access technology (RAT) indication relating to at least one radio access technology that is authorized and/or to at least one radio access technology that is not authorized for said mobile terminal, at least in said location structure.