Abstract: A method and a radio base station for autonomously adjusting a frequency band to be used by the base station that is newly installed, in order to prevent from deteriorating quality of radio waves of existing peripheral base stations, are provided. The radio base station connected to a line concentrator via a trunk and configured to communicate with a radio terminal includes an acquisition unit configured to acquire an available frequency band based on a radio communication condition of the peripheral base station prior to start of an operation for a radio communication with the radio terminal, and a selection unit configured to select, at start of the radio communication with the radio terminal, a frequency band to use for the communication with the radio terminal from the available frequency band.

Abstract: The disclosed radio base station (1A) executes radio communication with a radio terminal that measures the SNR or CNR of each of a plurality of predetermined subbands. The radio base station (1A) includes a radio communication unit (110), which receives a CQI indicating the SNR or CNR for each subband a plurality of times, or receives the CQI from a plurality of radio terminals that include said radio terminal, a counting unit (122c), which counts, for each of the plurality of subbands, the number of times that the radio communication unit (110) has received a CQI that has degraded more than a predetermined threshold value, and an interfered subband detector (123), which detects those subbands from among the plurality of subbands for which the count has reached a predetermined number as interfered subbands.

Abstract: A method and a radio base station for autonomously adjusting a frequency band to be used by the base station that is newly installed, in order to prevent from deteriorating quality of radio waves of existing peripheral base stations, are provided. The radio base station connected to a line concentrator via a trunk and configured to communicate with a radio terminal includes an acquisition unit configured to acquire an available frequency band based on a radio communication condition of the peripheral base station prior to start of an operation for a radio communication with the radio terminal, and a selection unit configured to select, at start of the radio communication with the radio terminal, a frequency band to use for the communication with the radio terminal from the available frequency band.

Abstract: The disclosed radio base station (1A) executes radio communication with a radio terminal that measures the SNR or CNR of each of a plurality of predetermined subbands. The radio base station (1A) includes a radio communication unit (110), which receives a CQI indicating the SNR or CNR for each subband a plurality of times, or receives the CQI from a plurality of radio terminals that include said radio terminal, a counting unit (122c), which counts, for each of the plurality of subbands, the number of times that the radio communication unit (110) has received a CQI that has degraded more than a predetermined threshold value, and an interfered subband detector (123), which detects those subbands from among the plurality of subbands for which the count has reached a predetermined number as interfered subbands.

Abstract: In a radio communication method, a radio base station detects, based on CQI information received from a radio terminal, any one of a plurality of subbands, the CQI value of which has been degraded as compared with a threshold value, as an interfered subband (Step S130). The radio base station then notifies interference information, which indicates the interfered subband, to a radio base station (Step S140). The radio base station if currently transmitting an interference signal using the interfered subband, reduces the transmission power of the interference signal or alternatively stops the transmission thereof (Step S150B).

Abstract: A wireless communication apparatus has a communication quality obtaining unit for obtaining communication quality of a radio propagation path with a communication counterpart, a retransmission number control unit for controlling the number of retransmissions at a predetermined first frequency based on the communication quality obtained by the communication quality obtaining unit, and a retransmission control unit for controlling retransmission such that retransmission over the number of retransmissions controlled by the retransmission number control unit is performed at a second frequency set with the communication counterpart.

Abstract: The invention determines a transmission power value or a data rate in transmission power control in a reception side apparatus. A communication apparatus includes a modulation class controlling portion for selecting one data rate, and transmits a communication signal having the selected one data rate to a communication apparatus.

Abstract: The invention aims at determining a transmission power value or a data rate in transmission power control in a reception side apparatus. A communication apparatus (2) includes a modulation class controlling portion (14) for selecting one data rate, and transmits a communication signal having the selected one data rate to a communication apparatus (3).