| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently improve communication quality even if a radio base station receives an interference signal in up-communication. SOLUTION: A radio terminal UE4 includes a transmission unit 312 which transmits a radio signal to the radio base station having a plurality of reception antennas through a plurality of transmission antennas 401 and 402, a transmission directivity control unit 422 which controls directional beams that the plurality of transmission antennas form on the basis of feedback information fed back from the radio base station and used to control the directional beams, and a control information acquisition unit 421 which obtains control information for directing null points of the directional beams to the direction of the other radio base station receiving the radio signal as an interference signal. The transmission directivity control unit 422 directs the directional beams to the direction of the radio base station on the basis of the feedback information and control information, and also directs the null points to the direction of the other radio base station. COPYRIGHT: (C)2010,JPO&INPIT
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