Terminal, base station, and computer-readable storage medium for executing beamforming using multiantenna

Abase station that communicates simultaneously with a plurality of terminals including multiple antennas that support beamforming and are capable of transmitting uplink beams in a plurality of directions, the base station comprising:

• multiple antennas that support beamforming and are capable of transmitting downlink beams in a plurality of directions;
• a communication quality measurement unit configured to, for each of the downlink beams of different directions of the base station, measure communication qualities of the plurality of uplink beams from each terminal;
• a best uplink beam selection unit configured to, for each of the downlink beams of different directions, select a best uplink beam with a communication quality equal to or higher than a predetermined condition from among the plurality of uplink beams of each terminal;
• and
• a best downlink beam selection unit configured to select, from among the plurality of downlink beams of the base station, a best downlink beam for which a sum total of communication qualities of the best uplink beams of all of the terminals is equal to or larger than a predetermined condition.

A non-transitory computer readable storage medium that stores a program that causes a computer to function, the computer being mounted on a terminal that communicates simultaneously with a plurality of base stations including multiple antennas that support beamforming and are capable of transmitting downlink beams in a plurality of directions, wherein

• the terminal includes multiple antennas that support beamforming and are capable of transmitting uplink beams in a plurality of directions, and
• the program causes the computer to perform a method comprising:
• measuring, for each of the uplink beams of different directions of the terminal, communication qualities of the plurality of downlink beams from each base station;
• selecting, for each of the uplink beams of different directions, a best downlink beam with a communication quality equal to or higher than a predetermined condition from among the plurality of downlink beams of each base station;
• and
• selecting, from among the plurality of uplink beams of the terminal, a best uplink beam for which a sum total of communication qualities of the best downlink beams of all of the base stations is equal to or larger than a predetermined condition.

A non-transitory computer readable storage medium that stores a program that causes a computer to function, the computer being mounted on a base station that communicates simultaneously with a plurality of terminals including multiple antennas that support beamforming and are capable of transmitting uplink beams in a plurality of directions, wherein

• the base station includes multiple antennas that support beamforming and are capable of transmitting downlink beams in a plurality of directions, and
• the program causes the computer to perform a method comprising:
• measuring, for each of the downlink beams of different directions of the base station, communication qualities of the plurality of uplink beams from each terminal;
• selecting, for each of the downlink beams of different directions, a best uplink beam with a communication quality equal to or higher than a predetermined condition from among the plurality of uplink beams of each terminal;
• and
• selecting, from among the plurality of downlink beams of the base station, a best downlink beam for which a sum total of communication qualities of the best uplink beams of all of the terminals is equal to or larger than a predetermined condition.