A base station apparatus adapted to receive, from a user equipment, a sounding reference signal, the base station apparatus comprising: transmitting means (101, 102, 103, 104, 108, 109) configured to transmit, to the user equipment, a higher layer signal including a set of first parameters and a set of second parameters, the transmitting means (101,102,103,104,108,109) configured to transmit, to the user equipment, a first downlink control information format including information requesting the user equipment to transmit the sounding reference signal, the first downlink control information format being used for scheduling of a physical uplink shared channel, the transmitting means (101,102,103,104,108,109) configured to transmit, to the user equipment, a second downlink control information format including the information requesting the user equipment to transmit the sounding reference signal, the second downlink control information format being used for scheduling of a physical downlink shared channel; and receiving means (103,104,105,106,107,108,109) configured to receive, based on the information requesting the user equipment to transmit the sounding reference signal, from the user equipment, the sounding reference signal using the set of the first parameters or the set of the second parameters, wherein the set of the first parameters is configured for the transmission of the sounding reference signal based on the information requesting the user equipment to transmit the sounding reference signal, the information requesting the user equipment to transmit the sounding reference signal being included in the first downlink control information format, and, the set of the second parameters is configured for the transmission of the sounding reference signal based on the information requesting the user equipment to transmit the sounding reference signal, the information requesting the user equipment to transmit the sounding reference signal being included in the second downlink control information format. transmitting means (101, 102, 103, 104, 108, 109) configured to transmit, to the user equipment, a higher layer signal including a set of first parameters and a set of second parameters, the transmitting means (101,102,103,104,108,109) configured to transmit, to the user equipment, a first downlink control information format including information requesting the user equipment to transmit the sounding reference signal, the first downlink control information format being used for scheduling of a physical uplink shared channel, the transmitting means (101,102,103,104,108,109) configured to transmit, to the user equipment, a second downlink control information format including the information requesting the user equipment to transmit the sounding reference signal, the second downlink control information format being used for scheduling of a physical downlink shared channel; and receiving means (103,104,105,106,107,108,109) configured to receive, based on the information requesting the user equipment to transmit the sounding reference signal, from the user equipment, the sounding reference signal using the set of the first parameters or the set of the second parameters, wherein the set of the first parameters is configured for the transmission of the sounding reference signal based on the information requesting the user equipment to transmit the sounding reference signal, the information requesting the user equipment to transmit the sounding reference signal being included in the first downlink control information format, and, the set of the second parameters is configured for the transmission of the sounding reference signal based on the information requesting the user equipment to transmit the sounding reference signal, the information requesting the user equipment to transmit the sounding reference signal being included in the second downlink control information format.