Patent ID: 8644243

Claim:
A base station apparatus in a mobile communication system in which a mobile station apparatus transmits, to the base station apparatus, uplink data on a physical uplink shared channel assigned by using a physical downlink control channel, the base station apparatus comprising: a transmitting unit configured to transmit, to the mobile station apparatus, a radio resource control signal including first information for determining an amount of resources for reception quality information transmitted together with the uplink data on the physical uplink shared channel; and the transmitting unit configured to transmit on the physical downlink control channel, to the mobile station apparatus, second information instructing a transmission of the reception quality information on the physical uplink shared channel assigned by using the physical downlink control channel, wherein the reception quality information of which the transmission is instructed by using the second information is transmitted together with the uplink data on the physical uplink shared channel, and the amount of resources for the reception quality information transmitted together with the uplink data on the physical uplink shared channel is determined based on the first information and a size of the physical uplink shared channel assigned by using the physical downlink control channel.