Terminal, base station, and communication method

A base station comprising:

• a transmitting section configured to transmit control information including information indicating a transmission parameter of a periodic sounding reference signal (P-SRS);
• a receiving section configured to receive a first P-SRS having a first bandwidth and a first power density and a second P-SRS having a second bandwidth narrower than the first bandwidth and a second power density higher than the first power density;
• a measuring section configured to measure channel state information (CSI) using the received first P-SRS and second P-SRS;
• and
• a selection section configured to perform frequency scheduling using the CSI based on the first P-SRS and the second P-SRS and to select a base station which participates in transmission/reception, using the CSI based on the second P-SRS.

A base station comprising:

• a transmitting section configured to transmit control information including information indicating a transmission parameter of an aperiodic sounding reference signal (A-SRS);
• a receiving section configured to receive a first A-SRS having a first bandwidth and a first power density and a second A-SRS having a second bandwidth narrower than the first bandwidth and a second power density higher than the first power density;
• a measuring section configured to measure channel state information (CSI) using the received first A-SRS and second A-SRS;
• and
• a selection section configured to perform frequency scheduling using the CSI based on the first A-SRS and the second A-SRS, and to select a base station which participates in transmission/reception, using the CSI based on the second A-SRS.

A communication method comprising:

• receiving control information including information indicating a transmission parameter of a periodic sounding reference signal (P-SRS);
• and
• transmitting a first P-SRS having a first bandwidth and a first power density at a first period using the transmission parameter included in the received control information;
• and
• transmitting a second P-SRS having a second bandwidth narrower than the first bandwidth and a second power density higher than the first power density at a second period using the transmission parameter included in the received control information.

A communication method comprising:

• receiving control information including information indicating a transmission parameter of an aperiodic sounding reference signal (A-SRS);
• transmitting a first A-SRS having a first bandwidth and a first power density during a first period only when a transmission request is made from a base station, using the transmission parameter included in the received control information;
• and
• transmitting a second A-SRS having a second bandwidth narrower than the first bandwidth and a second power density higher than the first power density during a second period only when a transmission request is made from the base station, using the transmission parameter included in the received control information.