Abstract: A user terminal is disclosed including a receiving section that monitors at least one of a first downlink control information format and a second downlink control information format in a plurality of search space sets configured for one or more cells to receive one or more pieces of downlink control information; and a control section that controls transmission of retransmission control information (HARQ-ACK) corresponding to the downlink control information, wherein at least one of a bit position of the HARQ-ACK and a downlink assignment index counter value (counter DAI value) is determined based on at least one of a cell index, a search space index, and a downlink control information format type. In another aspect, a radio communication method is also disclosed.

Abstract: A user apparatus in a wireless communication system including a base station and a user apparatus, includes a signal reception part that receives, from the base station, a plurality of power control parameters that become candidates for power control parameters to be used by the user apparatus, a transmission power determination part that selects power control parameters to be used, from the plurality of power control parameters, and determines a transmission power of a UL signal, based on the selected power control parameters and a pathloss estimation value, and a signal transmission part that transmits the UL signal using the transmission power determined by the transmission power determination part.

Abstract: Transmission directions of a plurality of carriers are appropriately configured. A user terminal includes: a reception section that receives sequence information indicating a plurality of sequences of information indicating a slot format by higher layer signaling, and receives instruction information for instructing one of the plurality of sequences according to a monitoring periodicity on a downlink control channel of a given carrier; and a control section that determines slot formats of the given carrier and an uplink carrier based on the sequence information and the instruction information in at least one of a case where a length of the sequence instructed by the instruction information is different from numbers of slots of the given carrier and the uplink carrier in the monitoring periodicity, and a case where a subcarrier spacing configured to the given carrier is different from a subcarrier spacing configured to the uplink carrier.

Abstract: In order to communicate properly even when a number of bandwidth parts are controlled to be switched, according to one aspect of the present disclosure, a user terminal has a receiving section that monitors and receives downlink control information that indicates a slot format, with a given periodicity, and a control section that, when transmitting and/or receiving processes are controlled by switching between a plurality of frequency bands that are configured partially in a frequency direction in a carrier, determines a slot format to apply to a given period in a frequency band after the switch, based on given information that is transmitted from a base station.

Abstract: To adequately control, even in a case that an Unknown resource is included within a time/frequency resource in which data channel is scheduled, transmission and/or reception of the data channel. A user terminal according to the present invention includes a receiving section that receives first downlink control information (DCI) indicating a Unknown resource in which transmission and/or reception the user terminal should not assume, and a control section that controls, in a case that at least a part of a time and/frequency resource in which data channel is scheduled according to second downlink control information (DCI) collides with the Unknown resource, reception and/or transmission of the data channel in the time and/or frequency resource.

Abstract: A user terminal according to an aspect of the present disclosure includes a receiving section that monitors, in a given frequency resource, a downlink control channel for control in another frequency resource, and a control section that judges a monitoring periodicity for the downlink control channel for control in the another frequency resource, based on a monitoring periodicity for the downlink control channel for control in the given frequency resource. According to an aspect of the present disclosure, the monitoring periodicity for the downlink control channel can be appropriately judged even in a case where a plurality of numerologies are used.

Abstract: A user terminal is disclosed that includes a receiving section that receives downlink control information including instruction information in relation to a plurality of frequency domains. The instruction information may instruct a slot format associated with a frequency domain. The user terminal may also include a control section that may specify the frequency domain associated with the instruction information and may decide a transmission direction used in the specified frequency domain according to the slot format instructed by the instruction information. When a payload size of the downlink control information is a first value or less and a number of pieces of the instruction information included in the downlink control information exceeds a second value, the control section may assume that the downlink control information includes the instruction information associated with a carrier in a serving cell.

Abstract: A user terminal according to one aspect of the present disclosure includes: a receiving section that receives downlink control information including instruction information in relation to a plurality of frequency domains, the instruction information instructing a slot format associated with a frequency domain; and a control section that specifies the frequency domain associated with the instruction information, and decides a transmission direction used in the specified frequency domain according to the slot format instructed by the instruction information. According to one aspect of the present disclosure, even when a plurality of frequency domains are used, it is possible to appropriately decide a slot format associated with each domain.

Abstract: One aspect of a user terminal according to the present invention includes: a receiving section that receives a plurality of pieces of Downlink Control Information (DCI) whose payloads are identical and whose identifiers used to scramble a cyclic redundancy check bit are identical; and a control section that controls communication processing based on an identifier field value included in each of the plurality of pieces of DCI, the communication processing being based on each of the plurality of pieces of DCI.

Abstract: Control of an operation in part of frequency bands is enabled. A user terminal includes: a reception section that receives instruction information on a downlink control channel, the instruction information instructing a pattern indicating a type of each symbol included in a slot; and a control section that controls transmission and reception based on the pattern instructed by the instruction information, and, when a plurality of part frequency bands in a carrier frequency band are configured, the control section determines a pattern for at least one part frequency band in the plurality of part frequency bands based on the instruction information.

Abstract: A radio communication system that forms a plurality of cells including a first cell and a second cell adjacent to the first cell, including: a first communication apparatus in the first cell; and a second communication apparatus in the second cell, wherein the first communication apparatus includes a first transmitting unit that transmits a reference signal and the second communication apparatus includes a second transmitting unit that transmits a reference signal, and the reference signal transmitted by the first transmitting unit and the reference signal transmitted by the second transmitting unit are orthogonalized in the same radio resource.

Abstract: An interaction method is presented for interference coordination information between base stations, a method for mitigating cross-link interference between base stations, and a base station using abovementioned methods. The interaction method for interference coordination information between base stations comprises: determining a predetermined beam setup of a base station; establishing a beam index indicating each beam in the predetermined beam setup and its corresponding status; and transmitting the beam index to other base stations. The method for mitigating cross-link interference between base stations comprises: receiving beam-associated interference coordination information from other base stations; determining, based on the interference coordination information, beam-associated interference status information; and adjusting, based on the interference status information, a power and/or a modulation coding scheme of each beam.

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: The present invention is designed to properly control enabling or disabling hopping of DMRS sequence in sTTIs shorter than 1-ms TTIs. According to one aspect of the present invention, a user terminal has a transmission section that transmits a demodulation reference signal for an uplink (UL) channel in a second transmission time interval (TTI) that is shorter than a first TTI, and a control section that controls enabling or disabling hopping of a base sequence for the demodulation reference signal based on whether or not an orthogonal cover code (OCC) is applied to the demodulation reference signal.

Abstract: A user equipment apparatus in a radio communication system in which uplink communication and downlink communication are dynamically changed includes a reception unit configured to receive, from a base station, control information indicating a resource for an uplink demodulation reference signal in a subframe used for transmitting uplink data; and a transmitting unit configured to transmit the uplink demodulation reference signal according to the control information; wherein the resource for the uplink demodulation reference signal is multiplexed into a part of resources corresponding to one or more symbols at a beginning of a data segment in the subframe used for transmitting the uplink data.

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: The present invention is designed so that the transmission of A/Ns 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 a downlink (DL) shared channel, and a control section that controls transmission of retransmission control information in response to the DL shared channel. The control section controls the transmission of the retransmission control information based on a reference value that is configured for timing for transmitting the retransmission control information.