Abstract: A system in which user terminal is able to aggressively select small cells in a radio communication system in which a macro cell and small cells are arranged to overlap each other is disclosed. A macro base station (M) configured to form a macro cell carries out the steps of determining the offset value to use in cell selection in a user terminal (UE) based on transmission property information of a second carrier in the small cell, and reporting the offset value to the user terminal (UE). Also, the user terminal (UE) carries out the steps of measuring the received quality of reference signals from the macro base station (M) and the small base station (S), receiving the offset value that is reported from the macro base station (M), and carrying out cell selection based on the received quality that is measured and the offset value that is received.

Abstract: A user apparatus transmits an uplink control signal to a base station apparatus using a single carrier scheme. The user apparatus includes: a unit configured to prepare acknowledgement information indicating positive acknowledgement or negative acknowledgement for a downlink data signal based on a result of demodulation of the downlink data signal; a unit configured to prepare channel state information indicating reception quality of a downlink reference signal; a unit configured to channel-code multiplexed control information in which the acknowledgement information and the channel state information are multiplexed to prepare the uplink control signal; and a unit configured to transmit the uplink control signal using dedicated resources different from resources for an uplink data signal.

Abstract: A user apparatus transmits an uplink control signal to a base station apparatus using a single carrier scheme. The user apparatus includes: a unit configured to prepare acknowledgement information indicating positive acknowledgement or negative acknowledgement for a downlink data signal based on a result of demodulation of the downlink data signal; a unit configured to prepare channel state information indicating reception quality of a downlink reference signal; a unit configured to channel-code multiplexed control information in which the acknowledgement information and the channel state information are multiplexed to prepare the uplink control signal; and a unit configured to transmit the uplink control signal using dedicated resources different from resources for an uplink data signal.

Abstract: To provide a radio base station apparatus, mobile terminal device and wireless communication method for transmitting and receiving downlink channel quality measurement reference signals in consideration of orthogonalization among transmission antennas, orthogonalization among cells, and interference estimation of high accuracy, in a wireless communication method of the invention, a radio base station apparatus generates channel quality measurement reference signals, performs randomization processing on the channel quality measurement reference signals to be mutually non-orthogonal among at least a part of cells, and orthogonalizes the channel quality measurement reference signals among transmission antennas to transmit to a mobile terminal device together with control information, and the mobile terminal device receives a downlink signal including the control information and the channel quality measurement reference signal, extracts the channel quality measurement reference signal using the control informatio

Abstract: The present invention is designed to provide a radio base station, a user terminal, a radio communication method and a radio communication system of novel structures that can achieve improved throughput and system capacity.

Abstract: The present invention is designed to provide a radio base station, a user terminal, a radio communication method and a radio communication system of novel structures that can achieve improved throughput and system capacity.

Abstract: The present invention is designed to provide highly efficient local area radio access. A communication system, in which a mobile terminal apparatus (10) detects a local area base station apparatus (30) to connect to, among local area base station apparatuses (30), is configured such that the local area base station apparatuses (30) transmit detection signals to be used to detect the local area base station apparatus (30), to the mobile terminal apparatus (10), in a radio communication scheme for the local areas, which is different from the radio communication scheme for the wide area, and the mobile terminal apparatus (10) transmits detection signal measurement results to the local area base station apparatus (30), through an uplink channel that is defined in the radio communication scheme for the local areas.

Abstract: In order to control feedback control information in uplink transmission appropriately even when using carrier aggregation in HetNet, the present invention provides a user terminal that is able to communicate with a plurality of radio base stations having overlapping coverage areas by using carrier aggregation, the user terminal comprising: a reception section that receives downlink shared channel signals using component carriers of a primary cell and a secondary cell; a generating section that generates transmission acknowledgement signals in response to the downlink shared channel signals; and an allocating section that allocates the transmission acknowledgement signals to predetermined uplink control channel resources, wherein the allocating section allocates the transmission acknowledgement signals to either or both of uplink control channel resources of the primary cell and uplink control channel resources of the secondary cell in accordance with contents of the transmission acknowledgement signals and/or

Abstract: The present invention is directed to preventing the load to be required for blind detection in a mobile station apparatus (UE) from increasing and switching between SU-MIMO and MU-MIMO dynamically, even in the event the system bandwidth is expanded. The present invention has a DCI format selection section (209) that selects identification information which identifies between a DCI format for SU-MIMO and a DCI format for MU-MIMO, a control signal generation section (210) that generates control signals including the identification information and including the DCI format for SU-MIMO or MU-MIMO, having the same number of bits, and a transmission section that transmits the control signals to a mobile station apparatus.

Abstract: In order to apply power scaling in a signal overlapping period where uplink transmission power exceeds an upper limit, while minimizing deterioration of uplink transmission quality, the present invention provides a user terminal that is capable of communicating with a plurality of radio base stations via a plurality of component carriers in a radio communication system using a system band configurable with the plurality of component carriers, the user terminal having: a transmitting section (106) that transmits an uplink physical channel at an uplink transmission timing, the plurality of component carriers being grouped into a plurality of timing groups, and the transmission timing being controlled per timing group; and a power control section (1084) that, when the uplink transmission timing is controlled per timing group, performs power scaling preferentially on physical channels in a full overlapping period in which the physical channels are of same subframe number and overlap each other across component ca

Abstract: A base station apparatus for a mobile communication system is disclosed that includes a unit to receive an uplink reference signal transmitted from user equipment, a unit to provide transmission power control data indicating whether a transmission power value of the uplink reference signal to be transmitted later is to be changed, a unit to derive a first offset power value so that the uplink control signal is transmitted at a power value determined by adding the first offset power value to the transmission power value of the uplink reference signal, a unit to derive a second offset power value so that the uplink control signal is transmitted at a power value determined by adding the second offset power value to the transmission power value of the uplink reference signal, and a unit to report the data and values to the user equipment.

Abstract: The present invention is designed to provide highly efficient small cell radio access that is specially customized for small cells. In a communication system having a macro base station apparatus (30) that forms a macro cell and a plurality of local base station apparatuses that are connected with the macro base station apparatus (30) via a communication link and that form small cells inside the macro cell, the macro base station apparatus (30) or the local base station apparatuses allocate signals to be transmitted and received by the small cells to specific radio resources and transmit the signals, and also report identification information that can identify the radio resources where the signals transmitted and r received by the small cells are allocated, to a mobile terminal apparatus.

Abstract: The present invention is designed to make it possible to apply power scaling to a period where the upper limit value is exceeded, while maintaining uplink transmission quality. In a radio communication system 1 in which multiple cells (C1 and C2) are formed, a base station apparatus (20) forms a first cell C1, which is one of the multiple cells, and has a control section (234) that controls uplink transmission times per timing group, which includes one component carrier or a plurality of component carriers, and a transmission section (106) that signals a timing group or a component carrier determined as a target of power scaling, as power scaling target information, in which the timing group or the component carrier, to which power scaling is applied, is expressly determined, to a the user terminal (10).

Abstract: The present invention is designed to enable 1-CC transmission when carrier aggregation is carried out by aggregating a first component carrier, which is used in a macro cell, and a second component carrier, which is used in a small cell. A user terminal according to the present invention receives duration configuration information, which indicates a first duration to communicate with a macro base station by using the first component carrier, and a second duration to communicate with a small base station by using the second component carrier, configures the first duration and the second duration based on the duration configuration information, transmits uplink signals for the macro base station by using the first component carrier in the first duration, and transmits uplink signals for the small base station by using the second component carrier in the second duration.

Abstract: The present invention is designed to provide a radio communication system, a base station apparatus, a user terminal and a radio communication method, whereby, when a plurality of kinds of CSI processes are configured, it is possible to lighten the processing load, and, furthermore, reduce the deterioration of throughput performance.

Abstract: A method and system for carrying out communication adequately in a HetNet even when the radio resource region for downlink control channels is expanded is disclosed. A radio communication method in a radio communication system having a macro base station that forms a macro cell and a small base station that forms a small cell such that at least part of the small cell overlaps the macro cell is provided, and the small base station performs the steps of generating specific control information of user terminals, scrambling the specific control information by using user-specific scrambling sequences, and transmitting the specific control information to user terminals in the small cell by using an enhanced downlink control channel that is frequency-division-multiplexed with a downlink shared data channel.

Abstract: A user device for a mobile communication system employing a multicarrier scheme is disclosed. The user device includes a control signal generating unit for generating a control signal. The user device also includes a transmitting unit for transmitting the control signal to a base station. The control signal sent by the user device is mapped to multiple frequency bands throughout a time period of a subframe but separated from each other in a frequency domain. Each of the frequency bands includes subcarriers used in orthogonal frequency division multiplexing.

Abstract: To suppress and minimize changes from the method of transmitting an uplink control information in the LTE system, while supporting increases in the system band and increases in the transmission layer when there is a PUSCH signal transmitted in the same subframe, provided is a configuration for generating a UCI signal for a base station apparatus (20) in a mobile communication system having a system band comprised of a plurality of component carriers, multiplexing the UCI signal into a PUSCH signal transmitted in the same subframe as the UCI signal in a user specific component carrier used in transmission of a PUCCH signal, and transmitting the PUSCH signal into which the UCI signal is multiplexed to the base station apparatus (20).

Abstract: A transmitting device for a mobile communication system employing a multicarrier scheme includes a mapping unit configured to map control information to subcarriers in a subframe; an inverse Fourier transform unit configured to inverse-Fourier-transform a signal of the mapped control information; and a transmitting unit configured to wirelessly transmit a transmission signal including the inverse-Fourier-transformed signal to a receiving device. The control information is mapped to control frequency bands that are discontinuous in the frequency domain and are provided across the subframe separately from frequency bands for a shared data channel. The mapping is performed such that the control information for the receiving device mapped to one of the control frequency bands is transmitted at the same time as the control information or the shared data channel for the receiving device mapped to a different frequency band.

Abstract: A mobile terminal apparatus estimates downlink channel states using respective reference signals included in downlink signals from plural cells; selects PMIs (Precoding Matrix Indicators) using a codebook based on the channel states; estimates a phase difference between the cells based on the selected PMIs or the channel states; and transmits information of the phase difference and the selected PMIs to radio base station apparatuses of the respective cells. A radio base station apparatus receives an uplink signal including a PMI and the information of the phase difference between the cells; multiplies a transmission signal by a precoding weight corresponding to the PMI; adjusts the phase difference between the cells with use of the information of the phase difference between the cells; and transmits the transmission signal to a radio base station apparatus of another cell by coordinated multi-point transmission.