Patent ID: 11968024
Assignee: SOFTBANK CORP.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An upper-airspace staying type communication relay apparatus for wirelessly communicating with a terminal apparatus, comprising:
an array antenna having plural antenna elements, the array antenna forming a service link cell capable of performing a radio communication with the terminal apparatus;
an information obtaining section for obtaining information on at least one of a position and attitude of the communication relay apparatus; and
a base-station processing section for performing a baseband process including a process for applying a precoding for beamforming in a frequency domain to a downlink transmission signal to be transmitted via the array antenna, and a process of applying a postcoding for beamforming in a frequency domain to an uplink reception signal received via the array antenna,
wherein the base-station processing section:
performs, with respect to a radio resource part for control communication by which a communication via a single or plural beams for control formed for the cell is performed among downlink radio resources used for the service link, a footprint fixation control for performing a precoding for beamforming in the frequency domain so as to fix a position of a footprint corresponding to the beam for control, based on information on at least one of the position and attitude of the communication relay apparatus obtained by the information obtaining section;
does not perform, with respect to downlink radio resource parts other than the radio resource part for control communication, the footprint fixation control on the basis of the information on at least one of the position and attitude of the communication relay apparatus;
performs, with respect to a radio resource part for control communication by which an uplink communication via a single or plural beams for control formed for the cell is performed among uplink radio resources used for the service link, a footprint fixation control for performing a postcoding for beamforming in the frequency domain so as to fix a position of a footprint corresponding to the beam for control, based on information on at least one of the position and attitude of the communication relay apparatus obtained by the information obtaining section; and
does not perform, with respect to uplink radio resource parts other than the radio resource part for control communication, the footprint fixation control on the basis of the information on at least one of the position and attitude of the communication relay apparatus, and

wherein, in the footprint fixation control, a beamforming is performed so that a main beam of the beam for control is directed toward a target point set in advance.