Radio base station, radio terminal, and radio communication method

Patent metadata

Field	Value
Publication number	US-8934559-B2
Application number	US-201013145766-A
Country	US
Kind code	B2
Filing date	Jan 22, 2010
Priority date	Jan 22, 2009
Publication date	Jan 13, 2015
Grant date	Jan 13, 2015

Abstract

A radio base station (BS 2 ) comprises: a transmitter ( 1412 ) that transmits, via a plurality of transmission antennas, a radio signal to a first radio terminal having a plurality of reception antennas; a transmission directivity controller ( 1422 ) that controls directional beam, which is formed by the transmission antennas, on the basis of feedback information that is fed back from the first radio terminal; and an information acquiring unit ( 1421 ) that acquires control information to be used for directing the null points of the directional beam toward a second radio terminal that receives, as an interference signal, the foregoing radio signal during communication with another radio base station. The transmission directivity controller ( 1422 ) directs, based on the feedback information and control information, the directional beam toward the first radio terminal and the foregoing null points toward the second radio terminal.

First claim

The invention claimed is:

1. A radio apparatus comprising:
a transmitter that transmits a radio signal via a plurality of transmission antennas to a first radio terminal having a plurality of reception antennas;
a controller that controls a directional beam, based on a first control information transmitted from the first radio terminal, and for directing the directional beam toward the first radio terminal; and
an acquisition unit that acquires a second control information tra…

Assignees

• Tanaka Takanori
• Kyocera Corp

Inventors

• Tanaka Takanori

Classifications

• H04W72/046

  Electricity · mapped topic

• H04W88/08

  Electricity · mapped topic

• H04B7/024 Primary

  Electricity · mapped topic