Abstract: A user device in a wireless communication system supporting D2D communication, includes a first transmitter configured to transmit control information for D2D by using a physical control channel for D2D in a wireless frame configuration in which the physical control channel for D2D and a physical data channel for D2D are frequency-multiplexed; and a second transmitter configured to transmit data corresponding to the control information for D2D by using the physical data channel for D2D in the wireless frame configuration in which the physical control channel for D2D and the physical data channel for D2D are multiplexed in a frequency domain.

Abstract: A control apparatus according to an embodiment is provided. The control apparatus is included in a wireless communication system that includes the control apparatus, which performs radio resource allocation for D2D communications, and a user apparatus. The control apparatus includes a detection unit configured to detect the user apparatus by receiving a D2D signal transmitted from the user apparatus; an allocation unit configured to allocate a specific radio resource to be used by the user apparatus for transmitting a D2D signal in the case where the user apparatus is detected; and a transmission unit configured to transmit a signal indicating the allocated specific radio resource to the user apparatus.

Abstract: The present invention is designed to implement dynamic TDD that does not rely on TDD-FDD CA-based TDD UL-DL configurations. A user terminal executes radio communication with a plurality of cells by employing carrier aggregation, and has a receiving section that, when a connection is established with a secondary cell serving as a dynamic TDD cell, receives control information, which is transmitted from a primary cell and which includes a dynamic command with respect to a subframe configuration of the dynamic TDD cell, and a control section that decides whether or not one or a plurality of subframes in the dynamic TDD cell are uplink subframes or downlink subframes based on the control information, and, furthermore, controls operations pertaining to the dynamic TDD cell.

Abstract: A user equipment of a mobile communication system supporting Device to Device (D2D) communication includes a memory that stores configuration information indicating information on a first resource with which transmission of a D2D signal by the user equipment is allowed and information on a second resource with which transmission of a D2D signal by an other user equipment is allowed, the other user equipment being a specific type of user equipment. The user equipment further includes a transmitter that transmits, based on the configuration information, the D2D signal using the first resource.

Abstract: A user device for a radio communication system supporting Device-to-Device (D2D) communication is disclosed. The user device includes a transmitter that transmits a D2D signal by mapping a reference signal to a physical channel according to a first mapping configuration or according to a second mapping configuration. The reference signal is mapped to more symbols in the second mapping configuration than in the first mapping configuration. When transmitting the D2D signal by applying the second mapping configuration to a Physical Sidelink Shared Channel (PSSCH), the transmitter of the user device generates parameters for generating the reference signal to be mapped to the PSSCH based on information included in a Physical Sidelink Control Channel (PSSCH).

Abstract: A user device, which is used in a mobile communication system supporting D2D communication, includes an acquirer that obtains a discovery message to be transmitted to another user device; a generator that divides the discovery message into two or more discovery messages, and stores the two or more discovery messages in two or more resource regions of a physical channel for the D2D communication to generate a transmission signal to be transmitted to the other user device; and a transmitter that transmits the transmission signal.

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: According to the present invention, data can be efficiently transmitted to a plurality of remote UEs in a D2D communication. A communication terminal includes a setting section configured to set layer 2 destination information so that identification information included in the destination information separately identifies a plurality of terminals with which D2D is carried out; and an allocating section configured to allocate, in one scheduling interval, the identification information to a control channel in a different subframe per each of the plurality of terminals, and to allocate, in one scheduling interval, transmission data respectively transmitted to the plurality of terminals to a data channel in a different subframe per each of the plurality of terminals.

Abstract: The present invention is designed to adequately carry out uplink communication in unlicensed bands in a radio communication system (LAA) that runs LTE in unlicensed bands. The present invention provides a control section that controls the transmission of an uplink signal in a first frequency carrier by executing LBT (Listen Before Talk), and a transmitting/receiving section that receives a downlink signal that is transmitted from a radio base station in the first frequency carrier, and the control section executes LBT at an OFDM symbol timing in a subframe of the first frequency carrier, and, if the received power in the LBT period is equal to or lower than a predetermined threshold and the downlink signal is not detected, the control section detects that the subframe is not used to transmit the downlink signal, and controls the uplink signal to be transmitted in this subframe.

Abstract: A user apparatus for use in a mobile communication system that supports D2D communication, including: a transmission unit configured to, when the user apparatus is located in-coverage of a base station, transmit a relay enabled notification indicating that the user apparatus is able to become a relay apparatus that relays data communication between a remote user apparatus and the base station; and a state control unit configured to activate the user apparatus as a candidate of the relay apparatus in response to receiving an activation instruction from the base station.

Abstract: The present invention is designed to reduce the decrease of spectral efficiency even when repetitious transmission is applied to communication by user terminals, in which 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 partial narrow bands in a system band, has a receiving section that receives information related to spreading codes, a generation section that generates uplink signals, and a transmission section that repeats transmitting uplink signals in a plurality of subframes, and the generation section applies a predetermined spreading code to an uplink signal that is transmitted in part or all of the plurality of subframes, based on the information related to spreading codes.

Abstract: A user apparatus used in a mobile communication system supporting D2D communication includes a broadcast channel information transmitter configured to transmit configuration information of a resource for another user apparatus to receive D2D control information, and information representing that the D2D control information is to be transmitted by using a broadcast channel for D2D; and a control information transmitter configured to transmit the D2D control information by using the resource.

Abstract: According to the present invention, in the case where a relaying operation is applied using a user terminal that supports D2D, the power consumption of a user terminal that is used as a relay node can be suppressed. A user terminal is configured to connect with a radio base station and another user terminal, and configured to relay transmission between the radio base station and the other user terminal. The user terminal includes a transmitting section configured to transmit information related to relay capability to the other user terminal; a receiving section configured to receive the information related to relay searching that is transmitted from the other user terminal; and a control section configured to control a connection state with respect to the radio base station. The transmitting section controls a transmission of the information related to relay capability based on the connection state with respect to the radio base station.

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: The present invention is designed to optimize the uplink random access procedure even when coverage enhancement is applied to communication by user terminals, in which the bandwidth for use is limited to partial reduced bandwidths in a system bandwidth. 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 information related to repetitious transmission of a PRACH (Physical Random Access CHannel); and a transmission section that transmits the PRACH in repetitions in part or all of subframes based on the information related to repetitious transmission.

Abstract: The present invention is designed to control inter-cell interference adequately even when a plurality of cells are placed at a high density. A user terminal can connect with a plurality of radio base stations, and has a receiving section that receives a downlink signal from each radio base station, and a power control section that, when an uplink grant or a downlink assignment and a control signal for power control are detected at the same time from the downlink signal, prioritizes a TPC command contained in the control signal for power control, and changes transmission power.

Abstract: A user apparatus is provided. The user apparatus is used in a mobile communication system in which D2D communications are supported. The user apparatus includes an obtaining unit configured to obtain from a base station control rules including predetermined communication methods applied to corresponding user apparatus types; a determination unit configured to determine which of the predetermined communication methods is to be applied to the user apparatus by comparing a type of the user apparatus and the control rules; and a transmission unit configured to transmit a D2D signal based on the determined predetermined communication method.

Abstract: A user equipment apparatus acting as a relay terminal to relay data between a remote terminal and a base station includes a transmission unit configured to transmit to the remote terminal a groupcast ID which is a destination for the data; a reception unit configured to receive a connection release request from the remote terminal; and a connection management unit configured to release a connection to the remote terminal when the connection release request is received from the remote terminal.

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 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.