Abstract: The present invention is designed to adequately achieve the effect of latency reduction even when TDD is applied. A user terminal communicates using a radio frame including a flexible subframe whose subframe type is changeable, and has a control section that controls transmission/reception based on a first subframe type, in which a UL control channel, a DL control channel, a UL data channel and/or a DL data channel are included in one subframe, and a second subframe type, in which UL communication or DL communication is performed in one subframe, and a receiving section that receives information about a subframe type provided in each flexible subframe.

Abstract: The present disclosure is designed to carry out cell search and/or Radio Resource Management (RRM) measurements accurately even in carriers in which Listen Before Talk (LBT) is configured. According one example of the present disclosure, a user terminal communicates by using a cell in which listening is executed before signal are transmitted, and has a receiving section that receives a detection/measurement signal including a first synchronization signal and a second synchronization signal, and a measurement section that carries out measurements by using a channel state measurement reference signal, which is included in the detection/measurement signal, and which is frequency-multiplexed with the first synchronization signal and/or the second synchronization signal.

Abstract: Disclosed are a downlink precoding method and a base station. The method includes: configuring a first precoding mode for a first cell, wherein the first precoding mode includes information of a precoding matrix configured for each candidate user of the first cell on each resource; selecting a scheduling user on each resource from candidate users according to the first precoding mode; and performing precoding to a channel estimation signal and downlink data of the scheduling user according to a precoding matrix of the scheduling user, and transmitting precoded channel estimation signal and precoded downlink data to the scheduling user. Such method and base station of the present disclosure can reduce the feedback overhead of the user, effectively improve the accuracy of channel quality indicator (CQI) estimation, and improve the system throughput and user throughput.

Abstract: Embodiments of the present disclosure provide a radio base station, a mobile station and a method for determining a transmitting power. A radio base station, according to an embodiment of the present disclosure, is connected with a plurality of mobile stations, wherein a first mobile station in the plurality of mobile stations can form at least one mobile station pair with other mobile stations. The radio base station comprises: a processing unit, configured to determine an initial value of a power factor of each mobile station pair according to state data of respective mobile stations in the mobile station pair, and determine an adjustment value of the power factor for the first mobile station according to state data of the first mobile station; and a transmitting unit, configured to transmit the initial value of the at least one mobile station pair and the adjustment value to the first mobile station.

Abstract: A transmitting apparatus and a transmitting method are provided. The transmitting apparatus comprises: an encoder configured to encode data for a plurality of user equipments into corresponding encoded signals, respectively; a modulator configured to perform a joint modulation on the encoded signals for the plurality of user equipments to generate modulated signals, wherein the modulator performs the joint modulation by mapping bits of the encoded signals for the plurality of user equipments to a symbol corresponding to each constellation point of a constellation map of the modulated signals so that respective constellation points satisfy a Gray mapping rule; a transmitter configured to transmit the modulated signals.

Abstract: The present invention is designed to set forth a method that can prevent demodulation errors in user terminals and make maximum use of resources when data transmission is carried out by using only part of the OFDM symbols in subframes. A user terminal according to an example of the present invention has a receiving section that receives information about the number of symbols used in a given subframe of a carrier where LBT (Listen Before Talk) is configured, in the carrier, and a control section that controls a receiving process in the given subframe based on the information about the number of symbols used.

Abstract: A base station used in a radio communication system includes a precoding matrix calculating unit that calculates a precoding matrix based on a first precoding matrix reported from a first user equipment in a pair selected as a target of multiplexing in a power region and a second precoding matrix reported from a second user equipment in the pair and a precoding unit that applies a precoding to transmission signals to the first user equipment and the second user equipment using the precoding matrix calculated by the precoding matrix calculating unit.

Abstract: To appropriately perform communication even when resource allocation is controlled by a frequency unit (for example, a subcarrier unit) that is smaller than a resource allocation unit of an existing LTE system, the present invention provides a user terminal having: a reception unit that receives downlink control information on a downlink control channel included in a given duration in a given bandwidth; and a control unit that controls uplink data transmission based on the downlink control information.

Abstract: A user terminal communicates using a cell in which listening is applied at least prior to DL transmission, and has a measurement section that measures a channel state using a channel state measurement reference signal, and a control section that controls transmission of channel state information at a predetermined timing, and the control section controls whether to transmit the channel state information based on a measurement state of the channel state, and also controls transmission of indication information that indicates a cell where the channel state information is transmitted.

Abstract: To realize appropriate PHR and/or BSR transmitting operation even if communicating using a carrier to which LBT is set.

Abstract: To achieve an appropriate random access operation even when multiple carriers to which Listen Before Talk (LBT) is applied belong to one timing advance group (TAG), a user terminal according to an aspect of the present invention includes a control unit for controlling a random access procedure on two or more carriers on which listening is performed before uplink transmission, a transmission unit for transmitting a random access preamble on at least one of the two or more carriers, and a reception unit for receiving a response signal in response to the random access preamble. The control unit controls the transmission unit to stop transmission of the random access preamble on the two or more carriers in accordance with reception of the response signal.

Abstract: Embodiments of the invention provide a signal transmission method of a wireless communication system, the method comprising: selecting a phase compensation value for a k-th layer of user data of the wireless communication system, performing, according to the phase compensation value, phase rotation on a reference signal in the k-th layer user data, so that a signal power of the reference signal, after performing interference mitigation thereon at a transmission end, does not exceed a predetermined power threshold, wherein, k is selected from 1 to M, and M is less than or equal to K, and K is the total number of layers of user data of the wireless communication system; and transmitting, through a wireless channel, the reference signal after the phase rotation.

Abstract: A user apparatus and a control information detection method executed by a user apparatus are disclosed. The user apparatus includes a memory that stores a preamble and identification information of the user apparatus; a processor that detects control information, addressed to the user apparatus, by monitoring a candidate area of a common candidate area where a plurality of user apparatuses commonly perform monitoring and an individual candidate area for the user apparatus; and a transmitter that transmits the preamble to a base station. The processor monitors, during a period when the user apparatus monitors a random access response, the individual candidate area using the identification information of the user apparatus to detect control information that is scrambled by the base station using the identification information of the user apparatus.

Abstract: A user apparatus that communicates with a base station in a mobile communication system, including: a reception unit configured to receive a radio signal from the base station by a downlink control channel; and a control information detection unit configured to detect control information, addressed to the user apparatus, mapped to a predetermined area in a time frequency resource of the downlink control channel by performing blind decoding in a plurality of candidate areas which are candidates of the predetermined area, wherein, when the user apparatus performs a random access procedure, the control information detection unit performs the blind decoding in areas in which a part of areas is excluded from the plurality of candidate areas.

Abstract: In order to prevent, in an LAA system supporting LBT, reduction in resource usage of the system, the present invention provides a radio base station that communicates with a user terminal capable of using a licensed band and unlicensed band. The radio base station comprises: an obtaining section that obtains information about an available time resource amount that is determined based on a result of LBT (Listen Before Talk) in the unlicensed band; and a control section that controls communication with the user terminal in the unlicensed band based on the information about the available time resource amount.

Abstract: Provided are a data transmitting method, a data receiving method, a data transmitting device and a data receiving device. The data transmitting method comprises: modulating data in a first modulation manner to generate a first symbol stream; decomposing the first symbol stream into a pre-determined number of second symbol streams, each of which is modulated in a modulation manner with a modulation order lower than a modulation order of the first modulation manner; processing the pre-determined number of second symbol streams to generate a code-division-multiplexed data stream; and processing the code-division-multiplexed data stream to send the processed data stream. With the methods and the devices, reliability for data transmission can be improved.

Abstract: A user terminal includes: a transmitter that transmits delivery acknowledgement signals (HARQ-ACKs); a receiver that receives downlink control information including: in one or more predetermined subframes of the downlink control information, first information that indicates a total number of cells to be subjected to downlink (DL) transmission scheduling, and second information that indicates a cumulative number of cells; and a processor that performs control so that the HARQ-ACKs are transmitted in predetermined uplink (UL) subframes based on the first information and the second information. The HARQ-ACKs are transmitted in response to DL signals transmitted from a plurality of cells. The plurality of cells include cells that use Time Division Duplex (TDD). A value of the first information is the same in each of the one or more predetermined subframes, and the processor updates the first information on a per subframe basis.

Abstract: The present invention is designed so that it is possible to feed back HARQ-ACKs adequately even when a plurality of component carriers are configured in a radio communication system. The present invention provides a receiving section that receives DL signals transmitted from a plurality of component carriers (CCs), and a control section that controls transmission of an HARQ-ACK in response to a received DL signal based on a counter DAI included in the downlink control information, and the counter DAI is configured to three or more bits in predetermined downlink control information. Also, the counter DAI can be comprised of varying numbers of bits depending on the number of CCs configured in the user terminal or the number of CCs where listening is applied to DL transmission.

Abstract: The present invention is designed to carry out adequate inter-frequency measurements in future radio communication systems.

Abstract: The present invention is designed to implement adequate inter-frequency measurements in next-generation communication systems. According to one aspect of the present invention, a user terminal has a measurement section that performs an inter-frequency measurement based on one measurement gap configuration, and a control section that controls whether or not to perform the inter-frequency measurement in a predetermined measurement gap.