Patent ID: 8848606

Claim:
A communication system comprising: a base station device; and a mobile station device, wherein the base station device comprises: a signal transmission unit configured to and/or programmed to transmit a signal including information, which specifies at least one second downlink carrier component different from a first downlink carrier component, to the mobile station device with use of RRC signaling via a physical downlink shared channel within the first downlink carrier component, wherein the first downlink carrier component and the second downlink carrier component have different carrier frequencies and each of the first downlink carrier component and the second downlink carrier component has its own system bandwidths, and the mobile station device comprises: an information acquisition unit configured to and/or programmed to acquire the information, which specifies the at least one second downlink carrier component different from the first downlink carrier component, to be transmitted using the RRC signaling via the physical downlink shared channel within the first downlink carrier component; and a communication unit configured to and/or programmed to communicate with the base station device by aggregate use of both the first downlink carrier component and the second downlink carrier component, wherein the information which specifies the at least one second downlink carrier component further specifies whether or not a specific physical channel is included in the second downlink carrier component.