Abstract: A user terminal includes a receiving section that receives a signal subjected to multiplexing in a power dimension in a given layer and that receives information about the multiplexing in the power dimension; and a signal processing section that demodulates a signal for the user terminal from the multiplexed signal based on the information about the multiplexing in the power dimension.

Abstract: A user equipment is disclosed including a first receiving section that receives control information in a first cell and a second receiving section that receives a detection signal in a second cell based on the control information. In the second cell, the control information is used to specify a radio resource to which the detection signal is allocated.

Abstract: The present invention is designed to establish synchronization between transmission points when downlink signals are transmitted from a plurality of transmission points to a user terminal. A radio communication system has a first radio base station that forms a first cell, a second radio base station that forms a second cell, which is placed on the area of the first cell in an overlapping manner, and a user terminal that is capable of carrying out radio communication with the first radio base station and the second radio base station, and the second radio base station has a receiving section that receives synchronization correction information, which is for establishing synchronization with a synchronization target, from the user terminal, and a synchronization correction section that corrects synchronization based on the synchronization correction information.

Abstract: A user terminal is disclosed including a first decoding section that decodes a downlink signal for another user terminal from downlink signals for a plurality of user terminals that are non-orthogonal multiplexed over a given radio resource. The user terminal includes a first judgement section that judges whether or not the downlink signal for the other user terminal has been successfully received, based on a decoding result in the first decoding section. The user terminal further includes an interference cancellation section that cancels the decoded downlink signal for the other user terminal from the downlink signals for the plurality of user terminals. The user terminal also includes a second decoding section that decodes a downlink signal for the user terminal, from the downlink signals for the plurality of user terminals, from which the downlink signal for the other user terminal has been canceled in the interference cancellation section.

Abstract: A base station that communicates with a mobile station by using a plurality of antenna ports includes a mapping information communication unit configured to generate mapping of reference signals for measuring channel state information of the antenna ports by combining, within a resource block, mappings of reference signals for measuring the channel state information, the mappings being defined for a predetermined number or less of the antenna ports, and configured to communicate information indicating the generated mapping to the mobile station; a multiplexer configured to multiplex the reference signals for measuring the channel state information in one or more resource elements in the resource block in accordance with the generated mapping; and a transmitter configured to transmit the reference signals for measuring the channel state information.

Abstract: A user equipment used in a mobile communication system that has multiple antenna ports configured to receive a first reference signal from a base station is disclosed. The antenna ports are configured to transmit the first feedback information for the first reference signal. Additionally, the antenna ports are configured to receive a second reference signal from the base station and transmit the second feedback information for the second reference signal.

Abstract: A radio base station is disclosed that receives an uplink signal using a time division duplexing (TDD) scheme, including an estimation section that estimates an interference level that the uplink signal receives in a plurality of subframes of which a downlink/uplink configuration differs among cells and a transmission section that transmits information about the interference level. The information about the interference level comprises interference levels about the plurality of subframes.

Abstract: A base station that communicates with a mobile station by using a plurality of antenna ports includes a mapping information communication unit configured to generate mapping of reference signals for measuring channel state information of the antenna ports. The base station applies identical mapping of the reference signals for measuring the channel state information to antenna ports included in any one group of the plurality of groups, while applying code division multiplexing to the reference signals for measuring the channel state information for the antenna ports. The base station applies different mappings of the reference signals for measuring the channel state information and communicates information indicating the generated mapping to the mobile station. The base station also includes a multiplexer to multiplex the reference signals in accordance with the generated mapping and a transmitter to transmit the reference signals for measuring the channel state information.

Abstract: For each UE, a base station determines the number of streams for transmitting a data signal, performs different precoding on the data signal depending on the UE, and allocates different transmission powers to at least two UEs. The base station transmits streams addressed to the at least two UEs in a form in which these streams are non-orthogonally mixed, with transmission powers that are different for the UEs. For each of the streams addressed to these UEs, the base station estimates predictive indices for these UEs from channel state information determined by the UEs to which those streams are addressed, and, based on the predictive indices, allocates different transmission powers to those UEs such that the better the predictive index is, the lower the transmission power is.

Abstract: A user device communicates with base stations in a radio communication system including the base stations. The user device includes a receiver that receives a first downlink control signal transmitted from one of the base stations, a transmitter that transmits uplink signals using multiple antenna ports or multiple beams, and a controller that controls, for each subframe, transmission timing of the uplink signals transmitted using the multiple antenna ports or the multiple beams, based on the first downlink control signal.

Abstract: Provided are a receiver, a transmitter and a radio communication method capable of using non-orthogonal multiple access while suppressing cost increase and processing delay. A mobile station 200A includes a target user control signal detector 230 and an interfering user control signal detector 240 which are configured to receive a control signal to be used to cancel a non-orthogonal signal by interference canceller. The control signal includes control information containing a radio resource block allocated to the non-orthogonal signal addressed to another mobile station. The mobile station 200A demodulates and cancels the radio signal addressed to the other mobile station on the basis of the control signal.

Abstract: The present invention is designed to provide a radio base station, a user terminal, a radio communication system and a radio communication method of novel structures that can improve the efficiency of the use of radio resources sufficiently.

Abstract: A user terminal includes a transmission section that transmits channels using a first cell and a second cell that belong to different cell groups, and a control section that, when a channel to be transmitted in the first cell and a channel to be transmitted in the second cell are same channels and channel transmission in the first cell overlaps at least partially in time with channel transmission in the second cell, preferentially allocates transmission power to one of the channel transmission in the first cell and the channel transmission in the second cell over the other.

Abstract: A user terminal includes a receiver that receives, from a radio base station, indication information to indicate whether or not uplink signals of a plurality of user terminals are non-orthogonal-multiplexed; a processor that switches between transmission power control methods based on the indication information; and a transmitter that transmits an uplink signal by using a switched transmission power control method.

Abstract: A user apparatus is disclosed herein that includes a receiver configured to receive a plurality of synchronization signals and a transmitter configured to transmit a sounding reference signal associated with a specific synchronization signal of the plurality of synchronization signals. The transmitter also maps the sounding reference signal to consecutive OFDM symbols in one slot.

Abstract: The present invention is designed to control the transmission and reception of signals adequately in future radio communication systems. A user terminal, which communicates by using first subframe for DL communication and second subframe for UL transmission and/or DL transmission that are configured between the first subframe configured in a given periodicity, has a receiving section that receives a first downlink control channel transmitted in the first subframe and a second downlink control channel transmitted in the second subframe, and a control section that controls transmission and reception of signals based on the first downlink control channel and/or the second downlink control channel, and the first downlink control channel and the second downlink control channel schedule at least different signals.

Abstract: The present invention is designed so that, even when UL and DL are controlled dynamically, it is possible to reduce interference adequately, and prevent the spectral efficiency from dropping significantly. A user terminal, which communicates with a radio base station, has a receiving section that receives downlink control information, and a control section that controls communication by switching between UL transmission and DL transmission per subframe and/or within a subframe based on the downlink control information, and the control section performs the UL transmission using a frequency band that is narrower than a frequency band used for the DL transmission.

Abstract: The present invention is designed to reduce the time it takes to form adequate beams, in communication using beamforming. According to one aspect of the present invention, a user terminal has a receiving section that, using temporally orthogonal radio resources, forms receiving beams and receives reference signals that are transmitted in different transmitting beams respectively, a measurement section that performs measurements based on the reference signals, and a control section that controls the forming of the receiving beams so that at least one of the reference signal is received in a given period set.

Abstract: The present invention is designed to reduce the time it takes to form adequate beams, in communication using beamforming. According to one aspect of the present invention, a user terminal has a transmission section that, using temporally orthogonal radio resources, forms different transmitting beams and transmits reference signals respectively to a radio base station, and a control section that controls the forming of the transmitting beams so that at least one of the reference signals is received in a receiving beam which the radio base station forms in a given period set.

Abstract: A user equipment is disclosed that includes a receiver configured to receive candidates of phase rotation in a horizontal direction and candidates of phase rotation in a vertical direction for precoding. The user equipment also has a processor configured to report feedback information including a phase rotation in the horizontal direction and a phase rotation in the vertical direction to a radio base station based upon the candidates of the phase rotation in a horizontal direction and the candidates of phase rotation in a vertical direction. Additionally, the candidates of phase rotation in the horizontal direction or the candidates of phase rotation in the vertical direction are a part of predetermined candidates, the part being selected from the predetermined candidates according to a predetermined method.