In an infrastructure equipment forming part of a mobile communications network, a controller is configured in combination with a receiver and transmitter to receive from one or more communications devices a channel state report for each of one or more predefined candidate channels within a frequency range, each of the candidate channels representing a minimum unit of communications resource usable to receive data on a downlink. The controller is configured to select, from the one or more candidate carriers, one or more component carriers for use in transmitting signals to the communications devices within the second frequency range to form a downlink providing a secondary cell, based on the received channel state reports, and to transmit an indication identifying the selected one or more component carriers to the one or more communications devices for use in transmitting signals to the one or more communications devices via the frequency range.