Wireless communication terminal device, wireless communication method and integrated circuit for controlling transmission power of sounding reference signal (srs)

A radio communication method implemented in a radio communication terminal apparatus, the method comprising:

• receiving control information including a transmission request for an aperiodic sounding reference signal (A-SRS) and including a transmission power control command (TPC command) for transmission of the A-SRS,
• controlling a transmission power value of the A-SRS using a first accumulation value of the TPC command updated with the received TPC command,
• setting the first accumulation value to zero in response to a radio resource control (RRC) control signal updating a transmission power parameter associated with the TPC command, and
• transmitting the A-SRS at the controlled transmission power value.

An integrated circuit for controlling operation of a radio communication terminal, the integrated circuit comprising:

• reception circuitry, which, in operation, controls reception of control information including a transmission request for an aperiodic sounding reference signal (A-SRS) and including a transmission power control command (TPC command) for transmission of the A-SRS,
• control circuitry, which is coupled to the reception circuity and which, in operation,
• controls a transmission power value of the A-SRS using a first accumulation value of the TPC command updated with the received TPC command, and
• sets the first accumulation value to zero in response to a radio resource control (RRC) control signal updating a transmission power parameter associated with the TPC command, and
• transmission circuitry, which is coupled to the control circuitry and which, in operation, controls transmission of the A-SRS at the controlled transmission power value.