Patent ID: 9681390
Date: 2017-06-13
CPC Classifications: H04B,H04J,H04L,H04W

Claim:
1. A radio communication terminal apparatus comprising: a receiver which, in operation, receives 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, wherein the A-SRS is selected, from among different A-SRS candidates respectively associated with different sets of parameters, based on downlink control information format (DCI format) and a bit value of the transmission request, a controller 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, controls the transmission power of the A-SRS using a second accumulation value, which is different from the first accumulation value and is updated with the TPC command received in a specific subframe and in a specific DCI format, and controls transmission of the A-SRS in response to the received transmission request for the A-SRS, and a transmitter which, in operation, transmits the A-SRS at the controlled transmission power value.