A communication device and methods are disclosed. A transmission directionality of a plurality of antennas is controlled based on a received previously known signal transmitted from a communication terminal, when a signal to the communication terminal is transmitted. A first upstream radio sub-resource for transmitting the received previously known signal is allocated to a first communication terminal to which a downstream radio resource is to be allocated, and a first upstream radio resource for a first previously known signal comprises the first upstream radio sub-resource. A second upstream radio sub-resource for transmitting the received previously known signal is allocated to a second communication terminal to which a downstream radio resource is not to be allocated, a second upstream radio resource for a second previously known signal comprising the second upstream radio sub-resource.