Abstract: A transmission device including: a memory, and a processor coupled to the memory and configured to, when data is transmitted to a reception device, transmit a first signal that includes the data and a second signal generated by performing, based on identification information of the reception device, phase modulation on a known signal.

Abstract: A mobile station reports, based on a known signal transmitted from a base station, channel state information to the base station and performs wireless communication with the base station by spatial multiplexing. The mobile station includes: a calculating unit that calculates first precoding information corresponding to first channel state information and used in horizontal direction beam formation in the base station, second precoding information corresponding to second channel state information, and third precoding information corresponding to both of the first channel state information and the second channel state information and used in vertical direction beam formation in the base station; and a report control unit that reports the first precoding information and the third precoding information in reporting the first channel state information, and reports the second precoding information without reporting the third precoding information in reporting the second channel state information.

Abstract: A wireless communication system 1 performs inter-cell coordination control that coordinates a pico base station 100 and a macro base station 200 with each other and transmits a signal to a mobile station 10 of a picocell. The pico base station 100 includes a controller 100a and a communication unit 100b. The controller 100a interleaves resources of an E-PDCCH of the picocell corresponding to a predetermined resource unit based on a coordinated area ID that is an identifier common to the pico base station 100 and the macro base station 200. The communication unit 100b transmits a control signal to the mobile station 10 of the picocell using a first resource of the E-PDCCH of the picocell that corresponds to at least a part of the predetermined resource unit and is to be decoded by the mobile station 10 of the picocell.

Abstract: A communication system including a user terminal and a plurality of base stations carries out CoMP (Coordinated Multi-Point) communication where a plurality of wireless signals are transmitted to the user terminal through a plurality of cells including a serving cell and a reference coordinated cell. The plurality of wireless signals containing the same data. The communication system selects the reference coordinated cell among the plurality of coordinated cells. The user terminal obtains an adjusting parameter to adjust the serving-cell phase using the wireless signals received from the reference coordinated cell and the serving cell, and transmits control information including the obtained adjusting parameter. The serving base station controls execution of the CoMP communication such that the serving-cell phase is adjusted on the basis of the adjusting parameter included in the received control information.

Abstract: A mobile station is configured to perform radio communication using spatial multiplexing with a base station. The mobile station includes a selecting unit and a transmitting unit. The selecting unit selects a data unit with highest channel quality from a plurality of data units and selects a spatial layer with highest reception quality from spatial layers belonging to the data unit. The transmitting unit transmits identification information of the spatial layer selected by the selecting unit to the base station as control information.

Abstract: A communication terminal device includes a determining unit that determines a region size of a control channel in accordance with a PHICH duration value transmitted from a base station device, and an acquiring unit that acquires, on the basis of the region size, data to be sent to the communication terminal device. A base station device includes a first control unit that updates a CFI value at a first interval, a second control unit that updates a PHICH duration value at a second interval, the second interval being greater than the first interval, and a scheduling unit that performs scheduling of, only in a subframe in which the PHICH duration value matches the CFI value, data to be sent to a communication terminal device that is outside an arrival coverage of a signal including the CFI value.

Abstract: A wireless communication system controls a transmission timing in each cell so that a control channel of a first cell and a data channel of a second cell temporally overlap each other. The wireless communication system includes a base station of the first cell. The base station of the first cell includes a first control unit and a first communicating unit. The first control unit notifies a base station of the second cell of information used to specify a resource of the control channel of the first cell. The first communicating unit transmits a control signal to a mobile station of the first cell by using a first resource of the control channel of the first cell.

Abstract: A wireless communication system controls a transmission timing in each cell so that a control channel of a first cell and a data channel of a second cell temporally overlap each other. The wireless communication system includes a base station of the first cell. The base station of the first cell includes a first control unit and a first communicating unit. The first control unit notifies a base station of the second cell information used to specify a resource of the control channel of the first cell. The first control unit sets a resource of the control channel of the first cell. The first communicating unit notifies the mobile station of the first cell of information for decoding the first resource and transmits a control signal to the mobile station of the first cell by using the first resource.

Abstract: A wireless communication method including: transmitting a first control signal from a connected wireless station to a wireless terminal, the connected wireless station being one of a plurality of wireless stations that is connected to the wireless terminal, the first control signal relating to a communication level between the wireless terminal and at least one wireless station that is selected from among the plurality of the wireless station, and controlling, by the wireless terminal that receives the first control signal, a transmission power of a transmission signal to the selected at least one wireless station based on the received first control signal.

Abstract: A wireless communication method including: when transmitting data from at least one of a plurality of transmission apparatuses to a reception apparatus using a radio resource, selecting a first transmission scheme or a second transmission scheme based on a status of transmission from the plurality of transmission apparatuses, the first transmission scheme in which the plurality of transmission apparatuses transmit same data to same reception apparatus using same radio resource, the second transmission scheme in which one transmission apparatus of the plurality of transmission apparatuses transmits the data to the reception apparatus using the radio resource.

Abstract: A wireless communication system including: a first wireless base station configured to perform joint transmission with at least a second wireless base station, the joint transmission being transmission for transmitting identical data to a wireless terminal using at least one frequency domain in synchronization with the at least a second wireless base station, and the wireless terminal configured to transmit feedback information to the first wireless base station, the feedback information relating to a reception quality for each of the at least one frequency domain of the performed joint transmission.

Abstract: A wireless communication system in which retransmission is performed between a transmitting apparatus and a receiving apparatus, whereby the transmitting apparatus includes, a first transmitting unit to transmit first data to the receiving apparatus and retransmission controlling unit to perform transmission of second data, the data part of which is same as that of the first data, without waiting for a feedback signal from receiving apparatus regarding the first data, and to wait for a feedback signal from the receiving apparatus regarding the second data, and the receiving apparatus includes, a second transmitting unit to transmit the feedback signal regarding the second data to the transmitting apparatus.

Abstract: A radio communication system in which a transmission station performs window function processing on a transmission symbol to which cyclic prefixes have been attached for each specified number of samples, then transmits the signal, and a receiving station extracts and demodulates effective signal portions from the received signal, wherein the transmission station uses a control channel to notify the receiving station of window width Nwin of the window function; the receiving station adjusts the extraction position of the received signal based on the window width notified from the transmission station; and the receiving station uses the extracted received signal to execute demodulation processing of the transmission symbol.

Abstract: A wireless communication system 1 performs inter-cell coordination control that coordinates a pico base station 100 and a macro base station 200 with each other and transmits a signal to a mobile station 10 of a picocell. The pico base station 100 includes a controller 100a and a communication unit 100b. The controller 100a interleaves resources of an E-PDCCH of the picocell corresponding to a predetermined resource unit based on a coordinated area ID that is an identifier common to the pico base station 100 and the macro base station 200. The communication unit 100b transmits a control signal to the mobile station 10 of the picocell using a first resource of the E-PDCCH of the picocell that corresponds to at least a part of the predetermined resource unit and is to be decoded by the mobile station 10 of the picocell.

Abstract: A wireless communication system includes a base station (100) and a mobile station (200) that transmit/receive a data signal and a control signal. The base station (100) includes a control unit (100a) and a communication unit (100b). The control unit (100a) allocates an E-Control region that is a resource across a sub frame that transmits a PDSCH and one previous sub frame to an E-PDCCH including resource allocation information related to the PDSCH. The communication unit (100b) transmits the E-PDCCH to the mobile station (200) using the E-Control region. The mobile station (200) includes a communication unit (200b) and a control unit (200a). The communication unit (200b) receives the E-PDCCH transmitted from the base station (100) using the E-Control region. The control unit (200a) demodulates the PDSCH based on the resource allocation information related to the PDSCH included in the E-PDCCH.

Abstract: In a communication system, a transmitter device transmits data to a receiver device for performing error-correcting decoding processing by combining received data and retransmitted data. The transmitter device selects one of a first set of schemes of an M number of modulation and coding schemes as a modulation and coding scheme (MCS) of first data according to communication quality information obtained from the receiver device when the first data is initially transmitted, and selects one of a second set of schemes of an N number of MCSs (N<M) according to the communication quality information when the first data is retransmitted. The transmitter device generates a control signal including information indicating the selected MCS so that an amount of information of the MCS selected from the second set of schemes is less than an amount of information of the MCS selected from the first set of schemes.

Abstract: A communication system includes a communication station that converts a value information into a code value based on a corresponding relationship in which a difference between a first value information and a second value information is set to any value equal to or greater than two, where the second value information corresponds to a code value where an error occurs in one bit of the code value corresponding to the first value information.

Abstract: A method of transmitting pilot signals for channel compensation in a mobile communication system is disclosed. In the disclosed method, a first pilot signal and a second pilot signal are time-division multiplexed together with a data signal of a user into a time-division multiplexed signal which data signal is assigned a certain bandwidth; the time-division multiplexed signal is frequency-division multiplexed together with time division multiplexed signals of other users when wirelessly transmitted; and the first pilot signal is assigned a bandwidth larger than the bandwidth of the data signal and the second pilot signal is assigned a bandwidth smaller than the bandwidth of the data signal.

Abstract: A pilot signal is transmitted with a predetermined frequency band and a data signal is transmitted with a partial band of the frequency band, and the pilot signal and the data signal to be transmitted with at least the partial band, are controlled its waveform to have the same waveforms in a frequency domain. Thus, in the case of controlling waveforms of the pilot signal and the data signal which have different occupied bands, it is possible to, in a portion of the occupied band for the data signal, avoid the mapping of a low-quality pilot signal or the like, enhance the data signal demodulation capability and improve the data signal reception characteristic while suppressing PAPR.

Abstract: A wireless communication system controls a transmission timing in each cell so that a control channel of a first cell and a data channel of a second cell temporally overlap each other. The wireless communication system includes a base station of the first cell. The base station of the first cell includes a first control unit and a first communicating unit. The first control unit notifies a base station of the second cell of information used to specify a resource of the control channel of the first cell. The first communicating unit transmits a control signal to a mobile station of the first cell by using a first resource of the control channel of the first cell.