TECHNICAL FIELD

The present disclosure relates to a terminal a base station, a transmission method, and a reception method.

BACKGROUND ART

In the standardization of 5G, a new radio access technology (New Radio (NR)) that is not necessarily backwards-compatible with LTE/LTE-Advanced is being discussed by the 3GPP.

Because NR is also operated in high-frequency bands, the application of beamforming control to reduce path loss is under consideration. For this reason, in the discussion of the transmission power control (TPC) method for NR uplink, a function extension accounting for beamforming based on the LTE uplink transmission power control method (see NPL 1, for example) is under consideration (see NPL 2, for example).

CITATION LIST

Non Patent Literature

NPL 1: 3GPP TS 36.213 V14.3.0, “Physical layer procedures (Release 14)” (2017 June)

NPL 2: R1-1716114, “Power control framework for PUSCH”, NTT DOCOMO, September 2017

NPL 3: R1-1712962, “Considerations on Multiple TRP/Panel Transmission”, Sony, August 2017

NPL 4: R4-1707512, “CDF requirements for mmWave UEs”, NTT DOCOMO, August 2017

SUMMARY OF INVENTION

Technical Problem

However, methods of transmission power control accounting for beamforming in NR have not been considered fully.

An embodiment of the present disclosure facilitates providing a terminal and a communication method capable of performing transmission power control appropriately while accounting for beamforming.

Solution to Problem

A terminal according to one embodiment of the present disclosure is provided with a circuit that calculates a transmission power of an uplink signal by using transmission power control information indicating one value from among a plurality of candidate values respectively associated with correction values that correct a control value to use in a closed loop control of the transmission power, and a transmitter that transmits the uplink signal with the transmission power, in which a first correction value and a second correction value having a larger step size than the first correction value are associated with each of the plurality of candidate values.

A terminal according to one embodiment of the present disclosure is provided with a circuit that generates transmission power control information indicating one value from among a plurality of candidate values respectively associated with correction values that correct a control value to use in a closed loop control of a transmission power of an uplink signal, and a receiver that receives the uplink signal transmitted with the transmission power, in which a first correction value and a second correction value having a larger step size than the first correction value are associated with each of the plurality of candidate values.

A transmission method according to one embodiment of the present disclosure includes calculating a transmission power of an uplink signal by using transmission power control information indicating one value from among a plurality of candidate values respectively associated with correction values that correct a control value to use in a closed loop control of the transmission power, and transmitting the uplink signal with the transmission power, in which a first correction value and a second correction value having a larger step size than the first correction value are associated with each of the plurality of candidate values.

A reception method according to one embodiment of the present disclosure includes generating transmission power control information indicating one value from among a plurality of candidate values respectively associated with correction values that correct a control value to use in a closed loop control of a transmission power of an uplink signal, and receiving the uplink signal transmitted with the transmission power, in which a first correction value and a second correction value having a larger step size than the first correction value are associated with each of the plurality of candidate values.

It should be noted that general or specific embodiments may be implemented as a system, an apparatus, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

Advantageous Effects of Invention

According to an embodiment of the present disclosure, it is possible to perform transmission power control appropriately while accounting for beamforming.

Additional benefits and advantages according to an embodiment of the present disclosure will become apparent from the specification and the drawings. The benefits and/or advantages may be individually obtained by the various embodiments and features of the specification and drawings, which need not all be provided in order to obtain one or more of such benefits and/or advantages.

