Wireless communication method and wireless communication system

A wireless communication system including an exchange device and a base station device configured to perform beamforming according to the control of the exchange device, wherein:

• the exchange device includes
• a controller configured to control any combination of an optical wavelength, a frequency, and an optical polarization or controls the frequency, and
• an optical modulator configured to transmit an optically modulated signal to the base station device via an optical transmission line, the optically modulated signal being generated by modulating an intensity of an optical signal on a basis of a transmission signal to be transmitted on a basis of the any combination of the optical wavelength, the frequency, and the optical polarization or the frequency switched by the controller;
• the base station device includes
• a beamforming circuit having an input port corresponding to the number of combinations of the optical wavelength, the frequency, and the optical polarization or the number of frequencies;
• and
• the beamforming circuit performs beamforming in a direction corresponding to the input port to which the electrical signal based on the optically modulated signal has been input.