Abstract: There is provided a wireless communication device includes a transmitter configured to transmit a known signal in each of a plurality of first directions different from each other, a receiver configured to receive a plurality of first reflected waves, each of the plurality of first reflected waves being generated by the known signal transmitted in each of the plurality of first directions and to detect each of a plurality of first reception intensities, each of the plurality of first reception intensities being associated with each of the plurality of first reflected waves; and a controller configured to determine a transmission direction of a radio signal addressed to a first wireless terminal, based on the plurality of first reception intensities and to control the transmitter to transmit the radio signal in the transmission direction.

Abstract: A base station forming a cell based on a value of a radio parameter includes a reception unit configured to receive a signal transmitted from a mobile terminal communicating with the base station, and a processor configured to adjust a value of a radio parameter of the base station based on first and second reception qualities of the mobile terminal, where the first reception quality is a value of a reception quality of a transmission signal of the base station and the second reception quality is a value of a reception quality of a transmission signal of another base station.

Abstract: A radio base station which includes an antenna and adjusts directivity of a radio wave to be transmitted and received by antenna weight of the antenna, the radio base station includes a receiver which receives a first reference signal from a first mobile terminal and a second reference signal from a second mobile terminal and a processer which produces antenna weight which is based on the first and the second reference signals, to the antenna for sending a common data to the first and the second mobile terminals.

Abstract: A communications apparatus includes a processor configured to identify positions where wireless communication with a mobile communications apparatus is possible, the positions being included in a coverage area of the communications apparatus; and obtain from a database that is inaccessible to the mobile communications apparatus, frequency information that indicates frequencies that can be used for the wireless communication at the identified positions; and an announcing unit configured to announce in the coverage area and by a radio signal, correspondence information that is based on the frequency information obtained by the obtaining unit and that correlates the positions and the frequencies that can be used.

Abstract: A radio base station controls an antenna by adjusting a radio parameter value of the radio base station, and notifies another radio base station of the adjustment of the radio parameter value. The radio base station receives information from the other radio base station. The information relates to an influence on a radio characteristic of a cell formed by the other radio base station. The radio characteristic is influenced by the adjustment of the radio parameter of the radio base station. The radio base station readjusts the radio parameter value of the radio base station based on the information. The information relates to the influence on the radio characteristic of the cell formed by the other radio base station.

Abstract: A base station device includes a first antenna which transmits a radio signal in a downlink, a second antenna which receives a radio signal in an uplink, and a tilt angle control unit which controls a tilt angle of the first antenna and the second antenna to decrease a difference in a position of a cell boundary of the downlink and a position of the cell boundary of the uplink based on a communication quality of the downlink and a communication quality of the uplink with respect to a first base station device and on the communication quality of a downlink and a communication quality of the uplink with respect to an adjacent second base station device.

Abstract: A decoding device includes a decoding unit that decodes control data to generate decode data, the control data indicating a state of a radio propagation channel; a reliability calculating unit that calculates a reliability indicator indicating a reliability of the decode data; and an outputting unit that outputs decode data whose reliability indicator is larger than a specified threshold; wherein the reliability calculating unit calculates the reliability indicator of decode data to be decoded, based on a similarity indicator indicating a similarity between the decode data to be decoded and previous decode data whose reliability indicator is larger than the threshold.

Abstract: A radio base station controls an antenna by adjusting a radio parameter value of the radio base station, and notifies another radio base station of the adjustment of the radio parameter value. The radio base station receives information from the other radio base station. The information relates to an influence on a radio characteristic of a cell formed by the other radio base station. The radio characteristic is influenced by the adjustment of the radio parameter of the radio base station. The radio base station readjusts the radio parameter value of the radio base station based on the information. The information relates to the influence on the radio characteristic of the cell formed by the other radio base station.

Abstract: There is provided a wireless communication device includes a transmitter configured to transmit a known signal in each of a plurality of first directions different from each other, a receiver configured to receive a plurality of first reflected waves, each of the plurality of first reflected waves being generated by the known signal transmitted in each of the plurality of first directions and to detect each of a plurality of first reception intensities, each of the plurality of first reception intensities being associated with each of the plurality of first reflected waves; and a controller configured to determine a transmission direction of a radio signal addressed to a first wireless terminal, based on the plurality of first reception intensities and to control the transmitter to transmit the radio signal in the transmission direction.

Abstract: A radio base station which includes an antenna and adjusts directivity of a radio wave to be transmitted and received by antenna weight of the antenna, the radio base station includes a receiver which receives a first reference signal from a first mobile terminal and a second reference signal from a second mobile terminal and a processer which produces antenna weight which is based on the first and the second reference signals, to the antenna for sending a common data to the first and the second mobile terminals.

Abstract: A base station forming a cell based on a value of a radio parameter includes a reception unit configured to receive a signal transmitted from a mobile terminal communicating with the base station, and a processor configured to adjust a value of a radio parameter of the base station based on first and second reception qualities of the mobile terminal, where the first reception quality is a value of a reception quality of a transmission signal of the base station and the second reception quality is a value of a reception quality of a transmission signal of another base station.

Abstract: A base station device includes a first antenna which transmits a radio signal in a downlink, a second antenna which receives a radio signal in an uplink, and a tilt angle control unit which controls a tilt angle of the first antenna and the second antenna to decrease a difference in a position of a cell boundary of the downlink and a position of the cell boundary of the uplink based on a communication quality of the downlink and a communication quality of the uplink with respect to a first base station device and on the communication quality of a downlink and a communication quality of the uplink with respect to an adjacent second base station device.

Abstract: A decoding device includes a decoding unit that decodes control data to generate decode data, the control data indicating a state of a radio propagation channel; a reliability calculating unit that calculates a reliability indicator indicating a reliability of the decode data; and an outputting unit that outputs decode data whose reliability indicator is larger than a specified threshold; wherein the reliability calculating unit calculates the reliability indicator of decode data to be decoded, based on a similarity indicator indicating a similarity between the decode data to be decoded and previous decode data whose reliability indicator is larger than the threshold.