Abstract: It is described a method for informing a user equipment of an activity status of a second communication carrier within a cellular network, wherein the user equipment is served by a base station and is adapted to communicate with the base station via a first communication carrier being assigned to the base station. Signals between the base station and the user equipment are transmittable using the first communication carrier and, if the second communication carrier is activated, using in addition the second communication carrier, wherein the first communication carrier is divided into subframes. The method includes sending an activity signal from the base station to the user equipment, wherein the activity signal includes information concerning the activity status of the second communication carrier, and re-sending the activity signal from the base station to the user equipment during predefined subframes.