Wireless communication apparatus

A wireless communication apparatus that spatially multiplexes data for transmission, comprising:

• a plurality of array antennas,
• a first processor, and
• a first memory to store the first program which, when executed by the first processor, performs processes of,
• controlling the plurality of array antennas so that the array antennas form beams of different shapes and each transmit signals for communication quality measurement in an area to be covered by the apparatus,
• determining an initial value of a beam shape to be used in data transmission to a counterpart device that has received the signals for communication quality measurement, based on communication quality of each beam measured by the opposite apparatus, and
• after the initial value is determined, repeatedly executing processing to control the array antennas to tentatively change a beam shape in use in data transmission to the counterpart device, and to redetermine a beam shape to be used in data transmission to the counterpart device, based on communication quality measured when a post-tentative-change beam shape is used and communication quality measured when a pre-tentative-change beam shape is used, wherein
• on each radio frame basis, the first processor determines counterpart devices to which data are transmitted, and executes radio resource assignment processing to select each of the determined counterpart devices to which data is transmitted one by one sequentially, and assign one or more of the array antennas, which is to be used in data transmission to each selected counterpart device, to the selected counterpart device, and
• in the radio resource assignment processing, the first processor redetermines a beam shape to be used in data transmission to the selected counterpart device each time the array antenna is assigned to the selected counterpart device.