A communication system includes a transmitting communication device and a receiving communication device. The transmitting communication device determines a control element, e.g., a control element of a Media Access Control protocol, associated with one of the carriers and provides the control element with an identifier specifying the carrier the control element is associated with. The transmitting communication device sends the control element with the identifier on one of the carriers to the receiving communication device. The receiving communication device receives the control element and determines, from the identifier received with the control element, the carrier the control element is associated with. Further, the receiving communication device determines, on the basis of parameters indicated by the control element, a data transmission property of the carrier the control element is associated with.