Abstract: A terminal according to one aspect of the present disclosure includes: a control section that assumes that a frequency domain orthogonal cover code (FD-OCC) having a sequence length of a number larger than two is applied to a demodulation reference signal mapped to a pair of resource elements the number of which is greater than two and that are being different in frequency; and a transmitting/receiving section that performs transmission processing or reception processing of the demodulation reference signal, based on the FD-OCC. According to one aspect of the present disclosure, even when there are terminals according to different releases, each of the terminals can appropriately perform communication.

Abstract: The user equipment comprises a reception unit configured to receive allocation information of reference signals from a base station apparatus or a first user equipment, the reference signals being used in a device-to-device direct communication; a control unit for determining a device-to-device direct communication signal based on the allocation information of reference signals used in the device-to-device direct communication; and a transmitter configured to transmit the determined device-to-device direct communication signal to a second user equipment, wherein the allocation information of reference signals used in the device-to-device direct communication includes a transmission density of the reference signals used in the device-to-device direct communication.

Abstract: An embodiment of present disclosure provides a method of transmitting channel state information reference signals, and a base station. An embodiment of the present disclosure provides a method of transmitting channel state information reference signals (CSI-RSs), which is executed by a base station, and this method includes the steps of determining whether or not it is necessary to use aperiodic CSI-RSs in a communication system in which a base station to use periodic CSI-RSs is provided, generating an aperiodic CSI-RS trigger signal and communicating the aperiodic CSI-RS trigger signal to a mobile station when aperiodic CSI-RSs need to be used, and communicating aperiodic CSI-RSs to the mobile station in accordance with the aperiodic CSI-RS trigger signal.

Abstract: A terminal is disclosed including a transmitter that transmits a beam recovery request signal and a processor that controls the transmission of the beam recovery request signal. The transmission of the beam recovery request signal is controlled by the processor based on a received power that is measured using a channel state information reference signal (CSI-RS) resource or a synchronization signal (SS) block that is quasi co-located (QCL) with a demodulation reference signal of a downlink control channel. In other aspects, a radio communication method is also disclosed.

Abstract: A user terminal according to one aspect of the present disclosure includes: a transmitting section that transmits an uplink shared channel by applying a precoder; and a control section that specifies a number of ports used to determine the precoder when a Sounding Reference Signal (SRS) resource is not configured. According to one aspect of the present disclosure, even when an SRS resource is not configured, it is possible to appropriately determine a precoder of a UL signal.

Abstract: A terminal according to an aspect of the present disclosure includes a control section that reduces a resource to which at least one of an uplink channel and a sounding reference signal (SRS) is mapped, in a case that a first resource provided for the uplink channel overlaps a second resource provided for the SRS, and a transmitting section that performs at least one of a transmission of the uplink channel and a transmission of the SRS. According to an aspect of the present disclosure, in a case that a resource provided for an uplink transmission overlaps a resource provided for an SRS, appropriate processing is performed.

Abstract: A user equipment (UE) is disclosed including a receiver that receives at least a reference signal (RS) transmitted using a first beam from a transmission and reception point (TRP), using at least a second beam, and a processor that determines the first beam paired with the second beam based on reception quality of the RSs. The UE further includes a transmitter that transmits feedback information indicating the determined first beam. The second beam is an omni-directional beam. The receiver receives, from the TRP, reception (Rx) beam designation information indicating an Rx beam to receive the RSs, and the second beam is the Rx beam.

Abstract: A terminal includes a receiving unit that receives a reference signal for acquiring a channel state and a control unit that performs measurement related to RSRP (Reference signal received power), based on a result of receiving the reference signal, and subcarrier spacing to be applied to the reference signal.

Abstract: A terminal includes a reception unit configured to receive a reference signal of a first RAT (Radio Access Technology) and a data signal of a second RAT; and a control unit configured to decode the data signal based on precoder information applied to the reference signal and to the data signal.

Abstract: A radio communication system includes a first radio base station having multiple antenna elements, and user equipment, wherein, for initial connection of the user equipment to the first radio base station, the first radio base station applies different precoding vectors to a downlink user common signal transmitted to all users located in or near a serving area of the first radio base station, and transmits the downlink user common signal while changing the applied precoding vector; wherein the user equipment selects a desired one of the precoding vectors applied to the downlink user common signal, and reports a selection result to the first radio base station, and wherein the first radio base station precodes a data signal addressed to the user equipment using the selected precoding vector and transmits the precoded data signal to the user equipment.

Abstract: To appropriately control communication using at least one of a synchronization signal block and a reference signal even when communication is performed using a BWP, according to one aspect of the present disclosure, there is provided a user terminal including: a receiving section that receives at least one of a synchronization signal block and a given reference signal in a given bandwidth part (BWP); and a control section that decides whether to apply a synchronization signal block to a specific operation based on at least one of information regarding a frequency position of a synchronization signal block commonly reported by a serving cell and information regarding a frequency position of a synchronization signal block in the BWP.

Abstract: A terminal is disclosed including a processor configured to map a phase tracking reference signal, PTRS, to at least one symbol used for an uplink shared channel; and a transmitter configured to perform transmission processing for the uplink shared channel and the PTRS, wherein the processor sets a reference for mapping the PTRS to a second symbol when the transmitter transmits a demodulation reference signal, DMRS, using a first symbol and the second symbol in the uplink shared channel. In other aspects, another terminal and a base station are also disclosed.

Abstract: A terminal includes a receiving unit that receives a block and a reference signal that is for measuring a channel state, wherein the block includes a synchronization signal and system information; and a control unit that measures L1-SINR (Layer1 Signal to interference plus noise power ratio) based on the block including the synchronization signal and the system information, the reference signal for measuring the channel state, and measurement using a resource for measuring interference, wherein the control unit determines a period of measurement of the Ll-SINR based on a configuration of the resource for measuring the interference.

Abstract: A user terminal according to one aspect of the present disclosure includes: a transmitting section that transmits an uplink signal; and a control section that uses, for the uplink signal, a sequence corresponding to information including whether change of a beam is necessary. According to one aspect of the present disclosure, overhead of a beam report can be reduced appropriately.

Abstract: A terminal is disclosed including a processor that assumes a position of an additional demodulation reference signal (DMRS) based on a value corresponding to whether frequency hopping is enabled or disabled; and a transmitter that transmits the additional DMRS according to an allocation duration of an uplink shared channel (PUSCH). In other aspects, a radio communication method and a base station are also disclosed.

Abstract: A method of frequency resource allocation for Channel State Information Reference Signal (CSI-RS) in a wireless communication system includes transmitting, from a base station (BS) to a user equipment (UE), a CSI-RS using a CSI-RS resource, calculating, with the UE, CSI based on the CSI-RS, and reporting, from the UE to the BS, the CSI. The CSI-RS resource in a frequency domain is allocated to one or more frequency resources that are part of a carrier bandwidth. The method further includes notifying, with the BS, the UE of a location of the one or more frequency resources in the frequency domain.

Abstract: A radio transmission device includes a transmitter (209) and a controller (203). The transmitter (209) transmits a radio signal in which a demodulation reference signal is mapped. When a plurality of the demodulation reference signals are to be mapped respectively to first and second unit resources consecutive in a time domain of the radio signal, the controller (203) applies the same sequence to each of the plurality of the demodulation reference signals to be mapped to the first and the second unit resources.

Abstract: A terminal including: a reception unit configured to receive configuration information of a time length for advancing a measurement gap from a base station apparatus; and a control unit configured to perform measurement, wherein the configuration information includes, as the time length for advancing the measurement gap, a time length selected from a plurality of time lengths including a predetermined time length shorter than 0.25 ms, and wherein the control unit is configured to perform measurement in the measurement gap advanced by the time length included in the configuration information.

Abstract: A terminal includes: a reception unit configured to receive information indicating overhead due to a reference signal of a first RAT (Radio Access Technology); and a control unit configured to determine a transport block size of a data signal of a second RAT based on the information indicating the overhead. The reception unit receives the data signal based on the determined transport block size.

Abstract: A wireless communication method includes transmitting, from a base station (BS), multiple downlink (DL) signals. The wireless communication method further includes receiving, with a user equipment (UE), two or more DL signals of the multiple DL signals, and notifying, with the BS, the UE of a number of the two or more DL signals. The two or more DL signals are associated with a Physical Random Access Channel (PRACH) resource.