Abstract: A user apparatus is described that performs D2D communication by radio, including a signal reception unit configured to detect a signal addressed to the user apparatus by detecting an identifier of a physical layer of the user apparatus that is associated with an identifier of an upper layer of the user apparatus from a signal received by radio. The signal reception unit further detects data of the upper layer addressed to the user apparatus by using the identifier of the physical layer of the user apparatus as a part of the identifier of the upper layer of the user apparatus.

Abstract: Provided is a user equipment in a radio communication system including a base station and the user equipment. The user equipment includes: a reception unit that receives an instruction related to a calculation method of a channel quality indicator, which is to be reported to the base station, from the base station; and a reporting unit that reports an index of a channel quality indicator, which is calculated in accordance with the instruction related to the calculation method of the channel quality indicator, to the base station.

Abstract: A user equipment in a radio communication system supporting D2D communication is disclosed that includes a determination unit that receives a first region in a radio frame, which is commonly used for downlink communication and uplink communication with a base station and includes the first region to which a downlink pilot signal and a downlink control signal are to be mapped and a second region to which downlink user data or uplink data is to be mapped, to determine whether a D2D signal is transmittable using the second region.

Abstract: A user apparatus according to an embodiment is provided in a wireless communication system in which D2D communications are supported. The user apparatus includes a resource allocation unit configured to allocate a resource for D2D control information to be transmitted at a transmission timing subsequent to a predetermined transmission timing; and a transmission unit configured to transmit resource reservation information including information indicating the resource for D2D control 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: A user equipment in a radio communication system supporting D2D communication includes a determination unit that receives a first region in a radio frame, which is commonly used for downlink communication and uplink communication with a base station and includes the first region to which a downlink pilot signal and a downlink control signal are to be mapped and a second region to which downlink user data or uplink data is to be mapped, to determine whether a D2D signal is transmittable using the second region; and a transmission unit that transmits the D2D signal using the second region in the radio frame where a D2D physical control channel and a D2D physical data channel are time-multiplexed when the determination unit determines that the D2D signal is transmittable.

Abstract: There is provided a user apparatus of a radio communication system supporting D2D communication, the user apparatus including a receiver configured to receive a signal of an external synchronization source, a synchronization signal transmitted from a base station, or a synchronization signal transmitted from another user apparatus; and a synchronization processor configured to execute, in accordance with priority information indicating priority order of signals used for synchronization, radio frame synchronization and frequency synchronization using any one of the signal of the external synchronization source, the synchronization signal transmitted from the base station, or the synchronization signal transmitted from the other user apparatus, which is received by the receiver.

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 apparatus that is used in a mobile communication system that supports D2D communication, and that includes a capability for becoming a relay apparatus for relaying data communication between a remote user apparatus and a base station, including: a transmission unit configured to transmit a measurement resource that is used for the remote user apparatus to select a relay apparatus from among candidates of relay apparatuses, and a layer 2 address of the user apparatus; and a response unit configured to receive, from the remote user apparatus, an assignment request of an address for data communication by the relay, and to transmit information of the address to the remote user apparatus.

Abstract: The present invention is designed to provide a user terminal and a radio communication method, whereby adequate communication can be performed when contention-based UL transmission is employed. A user terminal according to the present invention has a transmission section that transmits UL data and a reference signal without a UL transmission command from a radio base station, and control section that controls transmission of the UL data and the reference signal, and the control section applies a reference signal that can identify the user terminal, as the reference signal, and controls transmission of the UL data and the reference signal by using predetermined resources that are configured in advance.

Abstract: The present invention is designed to reduce the deterioration of communication performance in long TTIs even when short TTIs interrupt long TTIs. According to the present invention, a user terminal has a receiving section that receives downlink (DL) data in a first transmission time interval (TTI), and a control section that, when part of the DL data is punctured by transmission in a second TTI, which is shorter than the first TTI, controls recovery of the DL data based on retransmission data transmitted from a radio base station, without feedback information for acknowledging delivery of the DL data.

Abstract: According to the present invention, in an LTE system, communication can appropriately carried out even in the case where a bandwidth utilized in the transmission/receiving of data signals and control signals is configured narrower than the system bandwidth. According to an embodiment, a user terminal is configured to carry out communication with a radio base station using a narrow bandwidth that is limited to a narrower bandwidth than a system bandwidth. The user terminal includes a decision section configured to decide a frequency position for the narrow bandwidth to be arranged, based on given information; and a receiving section configured to receive a control signal and a data signal that are allocated on the narrow bandwidth based on the frequency position. The narrow bandwidth is arranged at different frequency positions per a predetermined period of time.

Abstract: The present invention is designed so as to carry out the listening operation that accompanies UL transmission and/or UL transmission adequately when UL transmission is controlled based on the result of listening. The present invention provides a transmission section that transmits an uplink shared channel, an uplink control channel and an uplink reference signal, and a control section that controls the transmission of the uplink shared channel, the uplink control channel and/or the uplink reference signal based on the result of listening in the uplink, and, when the uplink reference signal is configured to be transmitted in a subframe in which the uplink shared channel and/or the uplink control channel are transmitted, the control section controls the transmission of the uplink reference signal based on the result of listening that is executed before the uplink shared channel and/or the uplink control channel are transmitted.

Abstract: User equipment to be used in a communication system supporting D2D communication includes a setting unit that receives D2D gap configuration information from a base station, and sets a D2D gap based on the D2D gap configuration information; and a communication unit that monitors a D2D signal in a different frequency using the D2D gap, wherein the D2D gap that is set based on the D2D gap configuration information is a time interval with a predetermined time length in a time domain, the time interval being allocated based on a time hopping pattern.

Abstract: A user apparatus configured to perform communication with a base station in a mobile communication system, wherein a common search space and a user specific search space are multiplexed in a predetermined physical downlink control channel transmitted from the base station, the user apparatus including: a monitoring control unit configured to monitor, for each predetermined time frame, any one of the common search space and the user specific search space in the predetermined physical downlink control channel in order to obtain downlink control information.

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: There is provided user equipment that selects a resource for transmitting a signal based on a sensing result. The user equipment includes a detection unit that detects, by performing sensing in a time window for sensing, one or more resources capable of transmitting a signal in a time window for resource selection after the time window for sensing; a selection unit that selects a resource for transmitting a signal from the one or more detected resources; and a transmission unit that transmits the signal using the selected resource for transmitting the signal.

Abstract: To provide a technology of quickly transmitting a buffer status for a reduction of uplink transmission latency. Provided is a user equipment including: a transmission and reception unit that transmits and receives radio signal to and from a base Station; and a buffer status report transmission unit that transmits, to the base station, a speculative buffer status report indicating a buffer status that is expected in a subsequent subframe.

Abstract: Provided is a user equipment including a transmission and reception unit that transmits and receives a radio signal to and from a base station, and a transmission plan notification unit that transmits, to the base station, an uplink data transmission plan related to a semi-persistent scheduling (SPS) configuration.

Abstract: A transmission control technique is provided that is for a scheduling request to reduce latency in uplink transmission. An aspect of the present invention relates to a user equipment including a transceiver that transmits and receives a radio signal to and from a base station; and a scheduling request controller that adjusts a transmission period of a scheduling request in accordance with one or more scheduling request configurations in response to downlink control signaling.