Abstract: A user terminal according to one aspect of the present disclosure includes: a transmitting/receiving section that performs transmission and reception by using a first Component Carrier (CC) that uses a first Sub-Carrier Spacing (SCS), and a second CC that uses a second SCS larger than the first SCS; and a control section that, when a semi-static Hybrid Automatic Repeat reQuest Acknowledgement (HARQ-ACK) codebook related to both of the first CC and the second CC is transmitted on an uplink shared channel of the second CC, deletes an HARQ-ACK bit corresponding to a downlink shared channel candidate that does not satisfy a requirement of processing time. According to one aspect of the present disclosure, it is possible to appropriately transmit HARQ-ACK even when a semi-static HARQ-ACK codebook is configured.

Abstract: A user terminal according to one aspect of the present disclosure includes: a receiving section that receives downlink control information using a certain downlink control information format; and a control section that determines activation or deactivation of a secondary cell, based on the downlink control information. According to one aspect of the present disclosure, it is possible to control activation at higher speed.

Abstract: A base station according to an aspect of the present disclosure includes a transmitting section that transmits, in monitoring occasions with a certain period, downlink control information indicating a slot format for a certain cell, and a control section that controls transmission of the downlink control information in at least one of a plurality of cells including the certain cell. This allows communication in TDD to be appropriately controlled.

Abstract: In order to appropriately perform communication even when performing a random access procedure with fewer steps than the existing steps, an aspect of a user terminal according to the present disclosure includes a transmitting section that transmits a first UL signal including a preamble used for a random access and a second UL signal including a message, a receiving section that receives a response signal to the first UL signal and the second UL signal after the transmission of the second UL signal, and a control section that retransmits at least one of the first UL signal and the second UL signal based on a transmission failure of at least one of the first UL signal and the second UL signal.

Abstract: To appropriately perform activation/deactivation control that uses at least downlink control information, one aspect of a user terminal according to the present disclosure includes a reception section that receives a first control signal and a second control signal for instructing activation or deactivation of a cell, and a control section that activates or deactivates a given cell by using only one of the first control signal and the second control signal or both of the first control signal and the second control signal.

Abstract: In order to, in future radio communication systems, appropriately control activation and deactivation timings of an SCell, even in a case that whichever subcarrier spacing is configured on any carrier, an aspect of a user terminal according to the present disclosure includes a receiving section that receives an activation command or deactivation command for a certain cell, and a control section that applies, at a timing independent of a subcarrier spacing of a carrier on which the activation command or deactivation command is transmitted, an operation corresponding to reception of the activation command and deactivation.

Abstract: A terminal is disclosed including a transmitter that performs an uplink (UL) transmission; and a receiver that performs a downlink (DL) reception, wherein the transmitter does not perform the UL transmission in a period after a last symbol of the DL reception. In other aspects, a radio communication method, a base station, and a system are also disclosed.

Abstract: A terminal is disclosed including a receiver that receives a downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH) over more than two slots; and a processor that, if a slot indicated by a feedback timing indicator field for hybrid automatic repeat request-acknowledgement (HARQ-ACK) information overlaps with two slots among the more than two slots, determines whether to transmit the HARQ-ACK information in the two slots in the PUSCH based on a downlink assignment index (DAI) field value in the DCI. In other aspects, a radio communication method, a base station, and a system are also disclosed.

Abstract: A user terminal according to an aspect of the present disclosure includes: a receiving section that receives a plurality of downlink shared channels transmitted repeatedly; and a control section that assumes that downlink control information scheduling a specific downlink shared channel among the plurality of downlink shared channels indicates an index value associated with a modulation order and a code rate in a given table.

Abstract: In order to appropriately perform communication even when a random access procedure with fewer steps than the existing steps is performed, one aspect of a user terminal of the present disclosure includes a transmitting section that transmits a first UL signal including a preamble used for random access and a second UL signal including a message, a receiving section that receives a response signal to the first UL signal and the second UL signal after the second UL signal is transmitted, and a control section that controls a transmission by applying at least one of frequency multiplexing and time multiplexing to the first UL signal and the second UL signal.

Abstract: A terminal is disclosed that includes a receiver that receives first downlink control information (DCI) for scheduling initial transmission and second DCI for scheduling retransmission and a processor that controls transmission of a first uplink (UL) shared channel that is scheduled by the first DCI and transmission of a second UL shared channel that is scheduled by the second DCI. The processor controls the transmission of the first UL shared channel and the transmission of the second UL shared channel based on a reference value that is configured for timing for transmitting a UL shared channel based on information provided through higher layer signaling. The processor also controls transmission of the second UL shared channel in response to information included in each of the first DCI and the second DCI that indicates whether the UL shared channel includes initially transmitted data.

Abstract: To appropriately generate HARQ-ACK codebook even when transmission timings of delivery confirmation signals are configured flexibly, a user terminal according to an aspect of the present disclosure includes a transmitting section that transmits a delivery confirmation signal for a downlink shared channel, based on downlink control information used for scheduling the downlink shared channel, and a control section that determines codebook for the delivery confirmation signal, based on at least one of a transmission slot of the delivery confirmation signal and an uplink control channel resource for the delivery confirmation signal that are indicated by the downlink control information.

Abstract: In order to properly transmit UCI, even when PUCCH repetition transmission is used in future radio communication systems, a user terminal according to one aspect of the present disclosure includes a control section that determines a codebook for physical uplink control channel (PUCCH) transmission per slot, based on at least one of physical downlink shared channel (PDSCH) candidate occasions, a timing of hybrid automatic repeat request acknowledgement (HARQ-ACK) transmission corresponding to a received PDSCH and a PUCCH repetition factor, when PUCCH repetition transmission and a semi-static HARQ-ACK codebook are configured; and a transmitting section that transmits HARQ-ACK based on the codebook by applying the PUCCH repetition transmission.

Abstract: A user equipment in a wireless communication system includes a configuration information management unit configured to retain configuration information for transmitting a reference signal used for measuring interference in other user equipments, and a signal transmitter configured to transmit the reference signal based on the configuration information. When transmission of the reference signal contends with transmission or reception of another signal, the signal transmitter determines whether the reference signal is to be transmitted or not based on a predetermined priority level.

Abstract: A terminal is disclosed including a receiver that receives downlink control information for releasing a semi-persistent scheduling (SPS) of a downlink shared channel; and a processor, wherein if reception of no more than one unicast downlink shared channel per slot is supported by the terminal, a semi-static Hybrid automatic Repeat request Acknowledgement (HARQ-ACK) codebook is configured, and the SPS is configured, then the processor generates one HARQ-ACK bit for reception of the downlink control information. In other aspects, a radio communication method and a radio base station are also disclosed.

Abstract: The present invention is designed so that the transmission of PUSCH can be controlled properly when the reference value for the timing for transmitting signals is controlled in radio base stations and/or user terminals. A user terminal, according to the present invention, has a receiving section that receives downlink control information (DCI), and a control section that controls transmission of an uplink (UL) shared channel that is scheduled by the DCI, and the control section controls the transmission of the UL shared channel based on a reference value that is configured for the timing for transmitting the UL shared channel.

Abstract: Disclosed is a base station used as a first base station in a radio communication system having the first base station and a second base station. The base station includes a determination unit configured to determine a transmission direction configuration in a time segment having predetermined duration, and a configuration information transmission unit configured to periodically or aperiodically transmit information indicating the transmission direction configuration determined by the determination unit to the second base station.

Abstract: A user equipment for performing radio communication with a base station in accordance with dynamic TDD (Time Division Duplex) is disclosed. An aspect of the present invention relates to a user equipment including a transmission and reception unit that transmits a radio signal to and receives a radio signal from a base station in accordance with dynamic TDD; and a transmission power configuration unit that configures uplink transmission power toward the base station, wherein the transmission power configuration unit configures the uplink transmission power in accordance with a dedicated scheme, a group common scheme or a combined scheme of the dedicated scheme and the group common scheme.

Abstract: An object of the present disclosure is to suppress an increase in a processing load of a UE even when an HARQ-ACK codebook is semi-statically configured. One aspect of a user terminal according to the present disclosure includes: a transmission section that transmits a transmission acknowledgement signal for downlink transmission received via a downlink shared channel (PDSCH); and a control section that controls an information amount of the transmission acknowledgement signal based on downlink shared channel reception capability in a given domain of the own user terminal, and a number of downlink shared channels that can be scheduled in the given domain.

Abstract: Even when a plurality of numerologies are used, monitoring of a downlink control channel is appropriately controlled. A user terminal includes: a reception section that receives a downlink control channel; and a control section that controls monitoring of the downlink control channel by using a periodicity and an offset of a start timing associated with a subcarrier spacing.