Terminal, base station, and communication method

摘要

Provided is a terminal with which it is possible, in a heterogeneous cell network, to transmit a Periodic-Sounding Reference Signal (P-SRS) at a transmission bandwidth and power density necessary for carrying out both a process of selection of a transceiving participating base station and a process of frequency scheduling of a Physical Uplink Shared Channel (PUSCH). A terminal (300) comprises a receiving unit (301) which receives control information which includes information which denotes a P-SRS transmission parameter, and a transmission unit (303) which, using a transmission parameter which is included in the received control information, transmits a first P-SRS provided with a first bandwidth and a first power density at a first period, and transmits a second P-SRS provided with a second bandwidth which is narrower than the first bandwidth and second power density which is higher than the first power density at a second period.

主权项

1. A communication terminal apparatus comprising:
a receiver which, in operation, receives a transmission request for an aperiodic sounding reference signal (A-SRS), and a transmission power control command (TPC command) for transmission control of the A-SRS, the TPC command being received in a Physical Downlink Control Channel (PDCCH), a controller which, in operation, controls a transmission power value of a first A-SRS using a TPC command when the TPC command is received within a first time period, and controls a transmission power value of a second A-SRS using a TPC command when the TPC command is received within a second time period other than the first time period, the first and second time periods having different time lengths and the second time period following the first time period, transmission power values of the first A-SRS and the second A-SRS being controlled independently of each other, and a transmitter which, in operation, transmits the first A-SRS at the controlled transmission power value, and transmits the second A-SRS at the controlled transmission power value.