Abstract: An embodiment of the present invention provides a CSI-RS transmission method, a CSI feedback method, a base station and a mobile station. The transmission method for a base station transmitting a channel state information reference signal (CSI-RS), includes transmitting a first CSI-RS relating to a first antenna port of the base station to a mobile station, forming a second antenna port that is beamformed based on a first CSI feedback received from the mobile station, transmitting a second CSI-RS relating to the second antenna port to the mobile station, and selecting a beam for data transmission to the mobile station, based on a second CSI feedback received from the mobile station.

Abstract: To actualize proper UL communication in a communication system using a cell where application of listening is defined, a user terminal has a reception section that receives a DL signal including a UL transmission indication, and a control section that controls transmission of UL data based on the UL transmission indication and a channel access procedure before UL transmission, where the control section controls so as to perform a channel access procedure with random back-off.

Abstract: The present invention is designed to realize appropriate reporting of information about the allocation of UL signals. A user terminal has a receiving section that receives downlink control information including uplink resource allocation information, a control section that determines, based on the uplink resource allocation information, a resource block (RB) allocation pattern that is repeated every given-number of resource blocks, and a transmitting section that transmits a UL signal by using a plurality of resource blocks that are determined based on the RB allocation pattern.

Abstract: The present invention is designed to provide a master information block (MIB) suitable for an NB-IoT communication system. A base station according to an embodiment of the present invention includes a generation section that generates a master information block (MIB) including parameters selected based on an operation mode during narrow band communication, and a transmission section that transmits the MIB.

Abstract: The present invention is designed to suitably support transmission of uplink control information even when shortened TTIs are used. According to one aspect of the present invention, a user terminal that communicates using a shortened transmission time interval (TTI), in which the TTI duration is shorter than one ms, has a control section that controls transmission of uplink control information, and a transmission section that transmits the uplink control information in a predetermined shortened TTI, using an uplink control channel format, which is for shortened TTIs and which is compatible with multiple TTI durations.

Abstract: Disclosed are a method for transmitting Hybrid Automatic Repeat Request (HARQ) feedback information, a user equipment, and a base station. The method includes: determining a reception window of data on which HARQ binding is to be performed; detecting data in the reception window; and bundling and transmitting HARQ feedback information for the data detected in the reception window. By means of the method, the user equipment and the base station, HARD bundling can be very conveniently implemented in a Half-Duplex (HD) frequency division multiplexing system.

Abstract: The present application provides an uplink data transmission method and a user terminal (UE) for executing the method. The method in the present application comprises: A, generating a first random number; B, determining, according to the generated first random number, whether to initiate a random access process; if the random access process is initiated, obtaining a timing advance (TA) value from a base station by means of the random access process; and if the random access process is not initiated, listening for a TA message broadcast by another UE and obtaining a TA value from the TA message; C, transmitting uplink data according to the obtained TA value; D, if the uplink data is successfully transmitted, continuing to perform E, and if the uplink data is unsuccessfully transmitted, returning to A; and E, generating a TA message according to the obtained TA value, and broadcasting the generated TA message.

Abstract: The present invention provides a user terminal and a radio communication method, whereby data communication processes can be performed adequately even when downlink control channels that are different from those of existing LTE systems are configured. A user terminal has a receiving section that receives downlink control information, which is transmitted via a downlink control channel in a control resource set configured in a predetermined resource block, and a control section that controls receipt of downlink data scheduled in a predetermined frequency field, based on the downlink control information, and the downlink data is allocated over the predetermined frequency field from the same time location, or allocated to the predetermined frequency field from varying time locations.

Abstract: A user terminal is disclosed, which includes a receiver that receives a signal, and a processor that obtains a measurement result for one or more beams, based on the signal, before applying layer 3 filtering, and obtains a cell level measurement result based on the measurement result for the one or more beams. The one or more beams are up to a maximum of N beams having a quality that exceeds a threshold, and the number N is notified to the user terminal.

Abstract: There is provided user equipment of a radio communication system that supports D2D communication. The user equipment includes a storage that stores a Gap pattern indicating a Gap period repeatedly configured in a radio resource for UL; and a transmitter that transmits a signal of D2D communication in a Gap period indicated by the Gap pattern stored in the storage.

Abstract: In order that a user can perform a random access procedure suitable for a case where a usage band is limited to a frequency block that is a part of a system band, a user terminal according to one aspect of the present invention is a user terminal with a usage band limited to a frequency block that is a part of a system band, including a transmission section that transmits a random access signal with repetition, a reception section that receives a response signal to the random access signal with repetition, and a control section that detects a repetition number of the response signal, in which the reception section receives information for detection of the repetition number of the response signal and the control section detects the repetition number of the response signal based on a repetition level of the random access signal and the information for detection.

Abstract: A method of Channel State Information Reference Signal (CSI-RS) transmission from a base station (BS) to a user equipment (UE) includes reserving, with the BS, a CSI-RS resource used for aperiodic CSI-RS transmission in subframes transmitted from the BS, transmitting, from the BS to the UE, reservation information indicating the CSI-RS resource via higher layer signaling, and transmitting, from the BS to the UE, the aperiodic CSI-RS using the CSI-RS resource.

Abstract: This application provides data transmitting method, a data receiving method, a user equipment, and a base station, which can realize early acknowledgment of uplink data reception. The data transmitting method for a user equipment includes: transmitting uplink data to a base station with an initial retransmission times; determining, within a predetermined interval, whether an acknowledged signal of the uplink data is received from the base station, wherein in the case where the acknowledged signal is received within the predetermined interval, transmission of the uplink data is stopped; and in the case where the acknowledged signal is not received within the predetermined interval, the uplink data is transmitted to the base station in a subsequent retransmission mode, until the acknowledged signal is received from the base station or a maximum retransmission times is reached.

Abstract: Embodiments of the present application provide a beam selection method, a mobile station, and a base station. The beam selection method according to the embodiments of the application including: selecting one leading beam from a plurality of beams; selecting one combined beam from the plurality of beams according to the selected leading beam, where the leading beam and the combined beam are both located in one beam group, and beams in the beam group are orthogonal and adjacent to each other; determining a corresponding reference beam according to the beam group, wherein the reference beam is used to indicate a range of the beam group and is different from the leading beam.

Abstract: Provided are a method for controlling a transmission power, a mobile station and a base station. The method for controlling the transmit power can be applied to a mobile station, and the method includes: acquiring a power control pattern, which is information related to a scheme of controlling the transmission power; determining a reference power control parameter for the mobile station according to the power control pattern; and determining the transmission power of the mobile station based on the reference power control parameter. The method for controlling the transmission power according to the embodiments of the present disclosure enables the user equipment to transmit signals to the base station at a proper transmission power, and further enables the base station side to distinguish different user equipments according to differences of received powers of a plurality of users that adopt Non-orthogonal Multiple Access.

Abstract: Provided are a resource determination method, a base station and a mobile station. A resource determination method performed by the base station according to embodiments of the present invention includes: determining a resource configuration used for uplink transmission for each mobile station group in a plurality of mobile station groups corresponding to the base station; determining a resource offset set used for the plurality of mobile station groups, wherein the resource offset set includes a plurality of resource candidate offsets such that a mobile station connected to the base station determines uplink transmission resources for the mobile station according to the resource configuration of the mobile station group to which the mobile station belongs and resource candidate offsets in the resource offset set.

Abstract: A constellation rotation method is presented. The method includes: determining a statistical characteristic of a received signal of a Base Station (BS) according to a channel coefficient of one or more User Equipments (UEs), at least one of noise information and interference information, the received signal being a signal received by the BS through a physical channel from the one or more UEs; determining a constellation rotation angle of each UE according to the determined statistical characteristic of the received signal; and for each UE, rotating a constellation of a data stream of a UE according to the constellation rotation angle of the UE.

Abstract: Provided is an access method, which is applied to a user equipment. The access method comprises: acquiring an initial receiving target power of a base station to be accessed by the user equipment; setting candidate retransmission levels of an initial access signal of the user equipment based on the initial receiving target power; selecting a retransmission level for the user equipment from the candidate retransmission levels; and retransmitting the initial access signal to the base station according to the selected retransmission level to access a network. The technical solution of accessing in the embodiments of this disclosure enables a user equipment to retransmit an initial access signal using an appropriate retransmission solution, thereby increasing the spectrum utilization efficiency and saving the transmission power of the user equipment.

Abstract: A user terminal is disclosed that includes a receiver that performs sensing before signal transmission and a transmitter that transmits a Physical Uplink Shared Channel (PUSCH). In addition, the transmitter transmits predetermined information that relates to the transmission of the PUSCH. In other aspects a radio communication method for a user terminal is disclosed.

Abstract: The present invention is designed to suitably mitigate the decrease in communication throughput even when type-II feedback is used. According to one aspect of the present invention, a user terminal has a control section that determines a beam pattern that shows a fixed set of beams, and determines at least one beam that is not included in the beam pattern; and a transmission section that transmits feedback information related to the beam pattern and the at least one beam that is determined.