Abstract: The present invention is designed to implement a format for UL reference signals and/or the like that is suitable for future radio communication systems. The user terminal of the present application includes a transmission section that transmits an uplink (UL) reference signal, and a control section that controls transmission of the UL reference signal, and the control section maps the UL reference signal to at least one resource element based on a first grid, which defines each resource element composed of a subcarrier and a symbol, and a second grid, which defines the arrangement interval of the UL reference signal in the frequency direction and the arrangement interval of the UL reference signal in the time direction.

Abstract: The present invention is designed to implement a format for DL reference signals and/or the like that is suitable for future radio communication systems. The radio base station according to the present invention transmits a downlink (DL) reference signal. Also, the radio base station maps the DL reference signal to at least one resource element based on a first grid, which defines each resource element composed of a subcarrier and a symbol, and a second grid, which defines an arrangement interval of the DL reference signal in a frequency direction and an arrangement interval of the DL reference signal in a time direction.

Abstract: In order to realize appropriate communications in a next-generation communication system, the present invention provides a user terminal having: a reception section that receives a synchronization signal and broadcast signals; and a control section that uses the synchronization signal as a basis to specify a radio resource and/or a communication parameter of a radio access scheme used for transmission of at least one of the broadcast signals.

Abstract: A user terminal is disclosed, where a band to use is limited to a partial narrow band in a system band. The user terminal includes a transmitter that transmits and/or a receiver that receives a signal, and a controller that controls repetitious reception and/or repetitious transmission of a control channel in a random access procedure based on a coverage enhancement level for a random access channel. A radio base station that communicates with a user terminal is also disclosed, where a band to use is limited to a partial narrow band in a system band. The radio base station includes a transmitter that transmits and/or a receiver that receives a signal, and a controller that controls to transmit information to make the user terminal control repetitious reception and/or repetitious transmission of a control channel in a random access procedure based on a coverage enhancement level for a random access channel.

Abstract: The present invention is designed to reduce the decrease of throughput in communication by user terminals that are limited to using a partial narrow band in a system band as a band for their use. According to one aspect of the present invention, a user terminal, in which the band to use is limited to a partial narrow band in a system band, has a control section that selects a predetermined narrow band set that is formed with a plurality of narrow bands, and a receiving section that receives a downlink signal in a narrow band that is included in the predetermined narrow band set, and the control section selects the predetermined narrow band set from a plurality of narrow band sets, to which different frequency shifts are applied.

Abstract: The present invention is designed to reduce the monopolization of resources and reduce the decrease of spectral efficiency in communication by user terminals that are limited to using partial reduced bandwidths in a system bandwidth as bandwidths for their use. A radio base station that communicates with a user terminal, in which the bandwidth to use is limited to a partial reduced bandwidth in a system bandwidth, has a transmission section that transmits a downlink signal to the user terminal in repetitious transmission, and a control section that controls transmission intervals in repetitious transmission, and the transmission section reports information related to the transmission intervals in repetitious transmission to the user terminal.

Abstract: The present invention is designed to measure and/or report CSI (Channel State Information) of a plurality of narrow bands, even when the band to use is limited to a partial narrow band in a system band. According to one aspect of the present invention, a user terminal, in which the band to use is limited to a partial narrow band in a system band, has a receiving section that receives information related to CSI (Channel State Information) measurement in a narrow band, a measurement section that measures CSIs in a plurality of narrow bands based on the information related to CSI measurement, and a transmission section that reports the measured CSIs.

Abstract: The present invention is designed so that broadcast information is transmitted and received adequately even when the bandwidth to use is limited to partial reduced bandwidths in a system bandwidth and the broadcast information is transmitted and received in repetitions over multiple subframes. A user terminal, in which the bandwidth to use is limited to a partial reduced bandwidth in a system bandwidth, has a receiving section that receives first system information and second system information, and a control section that acquires transmission information, which includes the repetition factor for the second system information, from the first system information, and the receiving section receives the second system information based on the transmission information.

Abstract: The present invention is designed so that the decrease of spectral efficiency can be reduced even when coverage enhancement is attempted in communication by user terminals in which the bandwidth to use is limited to partial reduced bandwidths in a system bandwidth. A radio base station communicates with a user terminal in which the bandwidth to use is limited to partial reduced bandwidths in a system bandwidth, and this radio base station has a transmission section that transmits a downlink signal to the user terminal in repetitions, and a control section that controls transmission by applying a transmission method to use frequency hopping or a transmission method to use frequency scheduling to the downlink signal, and the transmission section transmits information about the transmission method to apply to the downlink signal to the user terminal.

Abstract: The present invention is designed to optimize the uplink access procedure even when the band to use is limited to partial narrow bands in a system band. A user terminal, in which the band to use is limited to a partial narrow band in a system band, has a receiving section that receives system information that includes indication information of an uplink carrier frequency, from a radio base station, as system information for narrow bands, which is different from system information for the system band, and a transmission section that transmits a random access preamble to the radio base station in one of a plurality of narrow bands that are specified by the indication information of the uplink carrier frequency.

Abstract: The present invention is designed to apply beam forming control between base stations in accordance with traffic that varies over time or geographically. A radio base station can exchange control information with a neighbor radio base station via backhaul, and has a transmitting/receiving section that transmits and receives the control information through backhaul signaling, and a control section that controls the antenna beam pattern of one or both of the neighbor radio base station and the radio base station based on traffic information and information about antenna beam forming for the neighbor radio base station and the radio base station, which are included in the control information.