TERMINAL DEVICE, BASE STATION DEVICE, AND WIRELESS COMMUNICATION SYSTEM

A terminal device includes a communicator that, after first data communication carried out with the use of a narrowly directional first beam, receives, by using a widely directional beam, a plurality of first signals that a base station device has transmitted by using respective narrowly directional beams, and a determination circuitry that calculates the reception quality of the plurality of first signals and determines a narrowly directional second beam that the base station device uses for communication. The communicator transmits a feedback signal including information indicating the second beam to the base station device by using the first beam and starts second data communication by using the first beam in a case in which the communicator has received, by using the first beam, a response indicating that the base station device has received the feedback signal.