Patent ID: 8831526

Claim:
A mobile station comprising: a first antenna coupled to a duplicator for transmitting and receiving radio signals; and a second antenna provided a distance from the first antenna; and a processor coupled to the second antenna, the processor being configured to: measure, when the mobile station moves in a traveling direction from a location of the first antenna toward a location of the second antenna, a reception quality of the radio signal received from a base station via the second antenna; notify the base station of the measured reception quality; perform a reception process of a radio signal that is transmitted by the base station, which performs adaptive modulation control based on the reception quality notified by the processor, and is received via the first antenna; determine a first delay time based on a value derived by subtracting a time needed for exchanging information between the mobile station and the base station from a time needed for the mobile station to move in the traveling direction the distance between the first and second antennas; delay, by the determined first delay time, a first timing of notifying the base station of the measured reception quality; acquire a moving speed of the mobile station; and change the distance between the first and second antennas, while maintaining a direction from the first antenna to the second antenna, to make the first delay time equal to or larger than 0 and equal to or smaller than a threshold value in accordance with the moving speed of the mobile station.