Abstract: To provide a radio base station apparatus and mobile terminal supporting each of a plurality of mobile communication systems when the plurality of mobile communication systems coexists, the radio base station apparatus assigns a modulated signal of a control signal to at least one frequency band with the system band of the LTE system as a unit on a predetermined data block basis (CCE basis) according to a predetermined rule, and when data blocks are assigned according to the rule as shown in FIG. 4(a), the mobile terminal demodulates CCEs of the same number in respective frequency bands at a time and thereby determines whether or not the signal is the control signal to the mobile terminal. Meanwhile, when data blocks are assigned according to the rules as shown in FIGS. 4(b) and 4(c), the mobile terminal demodulates a specific CCE block range in each frequency band, and thereby determines whether or not the signal is the control signal to the mobile terminal.

Abstract: The present invention provides a search space configuration that is suitable for a communication system in which a plurality of fundamental frequency blocks are grouped together into a wide band. A base station apparatus (20) has a selection section (302) that selects a system band in fundamental frequency block units, a downlink control information generation section (306) that generates downlink control information for demodulating the data channels that are sent separately in the selected fundamental frequency blocks, and arranges, in the downlink control channel of a specific fundamental frequency block among a plurality of fundamental frequency blocks, a search space in which downlink control information for the plurality of fundamental frequency blocks is contained, and a transmission section (203) that transmits the downlink control channel in which the search space with the downlink control information is arranged.

Abstract: The present invention maintains communication even during a transition period in which ON/OFF of the CIF is switched by higher layer signaling or during a transition period in which the number of component carrier aggregations is increased/decreased. In a radio communication system in which an LTE-A system, in which an LTE-A system to add or remove the frequency band to assign for communication between a base station apparatus (20) and a mobile terminal apparatus (10) on a per component carrier basis, and an LTE system to perform communication between the base station apparatus (20) and the mobile terminal apparatus (10) using one fixed fundamental frequency block, are arranged in an overlapping manner, in the LTE-A system, one of the fundamental frequency blocks assigned to the mobile terminal apparatus (10) is determined as an anchor block, and the anchor block supports the same operation as in the LTE system.

Abstract: A transmission apparatus is provided with radio resource assignment means that assigns radio resources to each physical channel according to a type of the physical channel; and transmission means that transmits information to be transmitted by each physical channel using the assigned radio resources.

Abstract: A mobile communication system includes a first assignment unit configured to assign radio resources to a user in a W-CDMA system, a second assignment unit configured to assign radio resources to a user in a LTE system, a dual mode terminal capable of communicating in the W-CDMA system and the LTE system, and a selection unit configured to select the first assignment unit or the second assignment unit depending on a type of user traffic data in communication with the dual mode terminal. The assignment unit selected by the selection unit determines which of the radio resources is available for the dual mode terminal and signals the determined radio resources to the dual mode terminal.

Abstract: A base station apparatus in a mobile communications system has a unit which transmits, to one or more user apparatuses, a downlink control signal including information for allocating a radio resource, a unit which receives an uplink signal from the one or more user apparatuses, and a unit which determines, based on a feedback from the user apparatus, a pre-encoding matrix indicator (PMI) indicating a pre-encoding matrix to be applied to multiple antennas of the base station apparatus. When a number of multiplexed users in the downlink control signal is no less than a predetermined number, the PMI indicating the pre-encoding matrix to be applied to a whole system bandwidth of the mobile communications system is reported to each of the user apparatuses.

Abstract: A communication apparatus to be used for a newer system employing an FDD scheme in an area where an older system and the newer system coexist. The communication apparatus includes a first communication unit communicating at least a downlink data channel of the newer system using a frequency band belonging to a first frequency range (3.4-3.8 GHz); and a second communication unit communicating at least an uplink control channel of the newer system using a frequency band belonging to a second frequency range (2 GHz band) lower than the first frequency range. The second frequency range is used for uplink and downlink communications in the older system.

Abstract: A radio communication system includes a first radio base station, second radio base stations, and mobile stations. Each of the mobile stations measures a first reception characteristic value and a second reception characteristic value for respective radio waves. The first radio base station determines the radio base station to which each of the mobile stations should connect, according to the first reception characteristic value, and classifies the mobile stations into a first mobile-station group and a second mobile-station group according to the second characteristic values.

Abstract: Downlink reception power from a second base station is adjusted upward using a cell range expansion offset value. Based on the downlink reception power, a connection destination base station for a user device is selected. A parameter for calculating a target uplink reception characteristic at the second base station is set according to the cell range expansion offset value corresponding to the second base station. Based on the parameter, the target uplink reception characteristic of radio waves from the user device is calculated. Uplink transmission power of the user device is controlled so that an uplink reception characteristic of radio waves from the user device approaches the target uplink reception characteristic.

Abstract: In a radio communication system including multiple mobile terminals and multiple radio base stations, the mobile terminal has a function of interference rejection combining. The radio base stations share downlink channel characteristics for mobile terminals connected to radio base stations. The radio base station gives weights to radio waves transmitted from multiple transmission antennas to perform in-phase addition of an interfering radio wave beam directed to a mobile terminal for which the desired radio base station is another radio base station to an interfering radio wave beam transmitted from yet another radio base station for limiting the number of interfering radio wave beams that arrive at the mobile terminal. The radio base station does not perform in-phase addition when the number of interfering radio wave beams of which interference can be suppressed by the mobile terminal is equal to or greater than the number of radio base stations that send interfering radio wave beams to the mobile terminal.

Abstract: Provided are a base station apparatus, a mobile terminal apparatus and a communication control method capable of selecting a CSI-RS arrangement flexibly in accordance with a system configuration. The base station apparatus has a CSI-RS arrangement section (211) configured to arrange a CSI-RS in a resource reserved for broadcasting when a mobile terminal apparatus (10) is notified of position information of the CSI-RS by broadcasting or in a resource associated with an cell ID of a serving area when the mobile terminal apparatus (10) obtains the position of the CSI-RS based on the cell ID; an identification information generating section (212) configured to generate an identification bit for identifying whether the CSI-RS is arranged in the resource reserved for broadcasting or in the resource associated with the cell ID; and a transmission/reception section (203) configured to transmit the identification information to the mobile terminal apparatus.

Abstract: A user terminal reports a group radio quality of each of radio resource groups to a base station at a first frequence. The base station reports an allocated radio resource group to be allocated for radio communication with the user terminal to the user terminal. The user terminal reports unit radio qualities of radio resource units contained in the allocated radio resource group to the base station at a second frequence that is higher than the first frequence. The base station performs radio resource scheduling based on the unit radio qualities.

Abstract: A transmission power control method and a mobile station apparatus that can adequately control the transmission power of a mobile station apparatus having multiple transmitting antennas is disclosed. The uplink transmission power control for the mobile station apparatus measures the path loss of at least one transmitting antenna, sets a representative value path loss based on the measured path loss measurement value, determines a total transmission power of the mobile station apparatus based on the representative value path loss, and determines the transmission power of each transmitting antenna by distributing the total transmission power to the transmitting antennas.

Abstract: To provide a radio communication control method suitable for transmitting a downlink shared channel and a downlink control channel for the shared channel with different base frequency blocks in a communication system in which a plurality of base frequency blocks is combined and the system band is thereby broadened, in the radio communication control method, when different component carriers are assigned to a PDCCH and a PDCCH, to actualize a DCI configuration with a CFI value included in DCI notified on the PDCCH, the DCI is provided with an additional field on which CFI value bits are set. Further, to actualize another DCI configuration with a CFI value included in DCI notified on the PDCCH, part of the DCI field is masked with the CFI value.

Abstract: The present invention is designed to maintain reduced interference in a layered network like a HetNet and improve the overall system throughput performance. A radio base station apparatus has a normal/ABS pattern determining section (2041) that determines a power ratio pattern that shows the power ratio between a reference signal (CRS) and a shared data channel signal (PDSCH) in each subframe, and a transmitting/receiving section (203) that transmits identification information for identifying the power ratio of each subframe in accordance with the determined power ratio pattern.

Abstract: To provide a mobile terminal apparatus and radio communication method for enabling feedback control information to be efficiently transmitted on a physical uplink control channel, a mobile terminal apparatus of the invention receives downlink shared data channels parallel in a plurality of CCs, makes determinations on the downlink shared data channels about ACK/NACK/DTX, collectively codes determination results (states) of the plurality of CCs after reducing the number of states allowed to be notified individually, and performs signal processing on the coded data to be orthogonalized between users to transmit.

Abstract: Provided is a radio base station apparatus capable of transmitting a control signal efficiently even in radio communications using a system band that includes a plurality of component carriers. In the radio base station apparatus, control signals of transport blocks corresponding to the plural component carriers are coded jointly and the coded control signal is assigned to one or plural component carriers to be transmitted. A mobile terminal apparatus receives data from the radio base station apparatus, separates the control signal from the received data and decodes the separated control signal thereby to obtain control information of the transport blocks of the corresponding component carriers.

Abstract: A radio communication system includes multiple radio base stations and multiple mobile communication terminals. Each mobile communication terminal measures a reception quality of radio waves from each radio base station. A first mobile communication terminal that can execute interference rejection combining offsets the reception quality value of radio waves from a second radio base station by using a first bias value. A second mobile communication terminal that cannot execute interference rejection combining offsets the reception quality value of radio waves from the second radio base station by using a second bias value that is lower than the first bias value. The first radio base station selects, as the radio access point for the mobile communication terminal, a radio base station corresponding to a reception quality value indicating a best reception quality among the first reception power value and the offset second reception power value.

Abstract: Provided is a receiver to improve the accuracy of estimating a covariance matrix RI+N based on a data signal. In an IRC receiver 10 according to the present invention, a data signal is configured to be transmitted in an SFBC pair including two resource elements, an estimated covariance matrix RI+N is configured to include a first covariance matrix RI+N (2m) including a desired signal component in even-numbered resource elements in the SFBC pair and a second covariance matrix RI+N (2m+1) including a desired signal component in odd-numbered resource elements in the space frequency block coding scheme unit, and a covariance matrix averaging unit 13 and a covariance matrix generation unit 16 are configured to perform, as the aforementioned predetermined process, an averaging process on each of elements in the first covariance matrix RI+N (2m) and elements in the second covariance matrix RI+N (2m+1).

Abstract: A radio communication system includes a first radio base station that forms a first cell; a plurality of second radio base stations each of which forms a second cell; and a mobile station provided with a radio communication unit that connects, by radio, to each radio base station. The first radio base station specifies a correction value according to the number of the second cells formed in the first cell of the first radio base station and signals the correction value to the mobile station. The mobile station corrects a characteristic value indicating the reception characteristic of radio waves from the second radio base station by using the correction value. Either the first radio base station or the mobile station selects the destination of the mobile station according to the characteristic value of the first radio base station and the corrected characteristic value of the second radio base station.