Terminal device, base station device, transmission method and transmit power setting method

摘要

The objective of the present invention is to provide a terminal device capable of suppressing delay in switching between transmit/receive points, and of reliably switching between the transmit/receive points. In the device, a reception processing unit (203) receives control information including a transmission request for an A-SRS and a report request for a downlink CSI, whereupon a transmission signal formation unit (207) transmits the A-SRS at a transmission power set on the basis of the report request. In addition, if a report for each downlink CSI between a plurality of base stations is requested in the report request, the transmission signal formation unit (207) transmits the A-SRS at a first transmission power, whereas if a report for a downlink CSI between a single cell is requested in the report request, the A-SRS is transmitted at a second transmission power. The first transmission power is greater than the second transmission power.

主权项

1. A terminal apparatus comprising:
a receiving section that receives a request for reporting of downlink channel state information (CSI), and downlink control information (DCI) including a request for transmission of a sounding reference signal (SRS) in one of a plurality of DCI formats, the plurality of DCI formats including DCI format 0 that includes uplink assignment information and DCI format 1A that includes downlink assignment information; and a transmitting section that transmits the SRS with transmission power that is set based on the reporting request, a DCI format in which the transmission request is included, and a parameter for setting an initial value of a transmission power control (TPC) command used for calculating the transmission power, the parameter being indicated in a random access procedure, the parameter for a terminal served by a macrocell being larger than a previously set threshold and the parameter for a terminal served by a picocell being equal to or less than the threshold, wherein: the transmitting section transmits the SRS with first transmission power when the reporting request indicates a request for reporting of downlink CSI between the terminal apparatus and each of a plurality of base stations, the transmission request is included in the DCI format 1A, and the parameter is equal to or less than a previously set threshold, and the transmitting section transmits the SRS with the second transmission power when the reporting request indicates a request for reporting of downlink CSI between the terminal apparatus and a single base station, when the transmission request is included in the DCI format 0, or when the parameter is greater than the previously set threshold; and the first transmission power is larger than the second transmission power.