A base station apparatus for use in a mobile communication system in which a mobile station apparatus transmits, to the base station apparatus, uplink data using a physical uplink shared channel, the physical uplink shared channel being assigned by an uplink data transmission permission signal transmitted 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 instructing the mobile station apparatus to periodically transmit first reception quality information, the transmitting unit configured to transmit, to the mobile station apparatus, the radio resource control signal including second information for determining a resource amount for second reception quality information transmitted using the physical uplink shared channel, the transmitting unit configured to transmit using the physical downlink control channel, to the mobile station apparatus, the uplink data transmission permission signal including third information instructing the mobile station apparatus to transmit the second reception quality information using the physical uplink shared channel; and a receiving unit configured to receive, from the mobile station apparatus, only the second reception quality information using the physical uplink shared channel in a case that the transmission of the first reception quality information which is instructed by using the first information and the transmission of the second reception quality information which is instructed by using the third information would occur at the same time, wherein the resource amount for the second reception quality information received using the physical uplink shared channel is determined based on the second information. a transmitting unit configured to transmit, to the mobile station apparatus, a radio resource control signal including first information instructing the mobile station apparatus to periodically transmit first reception quality information, the transmitting unit configured to transmit, to the mobile station apparatus, the radio resource control signal including second information for determining a resource amount for second reception quality information transmitted using the physical uplink shared channel, the transmitting unit configured to transmit using the physical downlink control channel, to the mobile station apparatus, the uplink data transmission permission signal including third information instructing the mobile station apparatus to transmit the second reception quality information using the physical uplink shared channel; and a receiving unit configured to receive, from the mobile station apparatus, only the second reception quality information using the physical uplink shared channel in a case that the transmission of the first reception quality information which is instructed by using the first information and the transmission of the second reception quality information which is instructed by using the third information would occur at the same time, wherein the resource amount for the second reception quality information received using the physical uplink shared channel is determined based on the second information.