Patent ID: 9106368
Filing Date: 2015-08-11
Classification: H04L

Abstract:
1. A base station apparatus configured to communicate with a mobile station apparatus by using a plurality of downlink component carriers, the base station apparatus comprising: a radio resource controller configured to set, on a first downlink component carrier on which a physical downlink control channel is transmitted by the base station apparatus, a plurality of control channel elements that constitute a user equipment specific search space, the user equipment specific search space including a plurality of physical downlink control channel candidates, downlink control information being transmitted using one of the plurality of physical downlink control channel candidates on the first downlink component carrier, in a case that the downlink control information indicates a resource allocation of a physical downlink shared channel on a second downlink component carrier, the plurality of control channel elements being set on the basis of an index number of the second downlink component carrier by the radio resource controller; and a transmission processing unit configured to transmit the downlink control information using the one of the plurality of physical downlink control channel candidates on the first downlink component carrier.