A communication device for transmitting data to or receiving data from a mobile communications network, the communication device comprising: a transmitter unit adapted to transmit data to the mobile communications network via a wireless access interface provided the mobile communications network, a receiver unit adapted to receive data from the mobile communications network via the wireless access interface, the data being provided in a radio frame that is divided into a plurality of time divided temporal units and including in each temporal unit a downlink control channel and a downlink shared channel, and a controller configured to control the receiver unit to receive downlink control information transmitted by the mobile communications network in one or more control channel elements of the downlink control channel of the wireless access interface, wherein the one or more control channel elements in which the downlink control information is transmitted is one of a plurality of sets of possible control channel elements in which the mobile communications network can transmit the downlink control information in one of the temporal units of the radio frame for communication devices to search for the downlink control information in each of the plurality of possible sets of control channel elements, wherein the controller for the communications device is configured to control the receiver unit to receive the downlink control information by searching for the downlink control channel in a predetermined sub-set of the plurality of possible sets of control channel elements in a first set of one or more of the temporal units of the radio frame according to a fixed aggregation level and a second sub-set of possible control channel elements which is selected from the plurality of possible sets of the control channel elements in a second set of one or more of the temporal units of the radio frame according to a configurable aggregation level, the second set of one or more of the temporal units being different from the first set of one or more of the temporal units. a transmitter unit adapted to transmit data to the mobile communications network via a wireless access interface provided the mobile communications network, a receiver unit adapted to receive data from the mobile communications network via the wireless access interface, the data being provided in a radio frame that is divided into a plurality of time divided temporal units and including in each temporal unit a downlink control channel and a downlink shared channel, and a controller configured to control the receiver unit to receive downlink control information transmitted by the mobile communications network in one or more control channel elements of the downlink control channel of the wireless access interface, wherein the one or more control channel elements in which the downlink control information is transmitted is one of a plurality of sets of possible control channel elements in which the mobile communications network can transmit the downlink control information in one of the temporal units of the radio frame for communication devices to search for the downlink control information in each of the plurality of possible sets of control channel elements, wherein the controller for the communications device is configured to control the receiver unit to receive the downlink control information by searching for the downlink control channel in a predetermined sub-set of the plurality of possible sets of control channel elements in a first set of one or more of the temporal units of the radio frame according to a fixed aggregation level and a second sub-set of possible control channel elements which is selected from the plurality of possible sets of the control channel elements in a second set of one or more of the temporal units of the radio frame according to a configurable aggregation level, the second set of one or more of the temporal units being different from the first set of one or more of the temporal units.