User terminal, radio base station, and radio communication method

A radio base station which configures a first cell group and is configured to carry out communication with a user terminal, using dual connectivity, together with another radio base station that configures a second cell group, said radio base station comprising:

• a receiving section configured to receive a sounding reference signal (SRS) transmitted from the user terminal;
• a control section configured to control a required transmission power for the SRS;
• and
• a transmission section configured to transmit, to the user terminal, information regarding guaranteed transmission power that is determined for at least one cell group,
• wherein the receiving section receives the SRS, the transmission power of which being controlled based on the required transmission power or the guaranteed transmission power.

A radio communication method for a user terminal configured to carry out communication, using dual connectivity, with a first radio base station that configures a first cell group and a second radio base station that configures a second cell group, said radio communication method comprising:

• deciding a transmission power of a sounding reference signal (SRS) for each cell group;
• transmitting the SRS to each cell group;
• and
• deciding a SRS transmission power for each cell group in accordance with whether or not a required power for the radio base station is allocated as the SRS transmission power.