A method, comprising: receiving, by a shared access authorized controller (210, 310), an indication that a carrier frequency should be reused by a primary system; determining, in the controller shared access authorized (210, 310) in response to receiving the indication, at least one offset value expansion allowable maximum range for at least one picocell (250, 260, 270, 350, 360, 370 ) in a coverage area of a macrocell (240, 340) determined under certain restrictions interference to the primary system; and sending the at least one offset value expansion of its maximum allowable set for the at least one picocell (250, 260, 270, 350, 360, 370) from the controller authorized shared access (210, 310) to the macrocell (240, 340).