COMMUNICATION DEVICE, CONTROL INFORMATION RECEIVING METHOD AND INTEGRATED CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a communication device capable of preventing decrease of quality of downstream allocation control information while preventing increase of blind determining times at a wireless terminal at the reception side of downstream control channel signal.SOLUTION: In a base station (100), a control section (101) and an information size adjustment section (103) controls the size of information of downstream allocation control information and upstream allocation control information which are included in PDCCH signals based on the communication system which is applied to the communication between the base station (100) and a terminal (200), the number of antennas M(natural number) of the base station (100), the number of antennas N(natural number) of terminal (200), the band width of the downstream band and the band width of the upstream band. In particular. When the selected communication system is established among plural antennas for the first time and when one of the M and N is plural and the other is single, the control section (101) determines that adjustment of the information size is not necessary.