Mobile station having multiple antennas to account for movement between time of quality measurement and time of data reception

A base station, comprising:

• a receiver configured to receive a notification of a reception quality from a mobile station, which includes first and second antennas with a distance therebetween and moves in a traveling direction from a location of the first antenna toward a location of the second antenna, the reception quality being measured by the mobile station on a radio signal that is transmitted by the base station and received by the mobile station via the second antenna;
• a processor configured to perform adaptive modulation control on a transmission signal based on the reception quality;
• and
• a transmitter configured to transmit the transmission signal in accordance with the adaptive modulation control to allow reception thereof by the mobile station via the first antenna, wherein
• the first antenna is coupled to a duplicator for transmitting and receiving radio signals;
• the second antenna is coupled to a processor for processing a radio signal received via the second antenna;
• and
• the mobile station comprises a processor configured to:
• determine a 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 delay time, a 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 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.

A method of a mobile station provided with a first antenna and a second antenna with a distance therebetween for adjusting to movement of the mobile station, the method comprising:

• measuring, when the mobile station moves in a direction from a location of the first antenna toward a location of the second antenna, a reception quality of a radio signal received from a base station via the second antenna;
• notifying the base station of the reception quality measured by the reception quality measurement unit;
• performing 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 notification unit, and is received via the first antenna;
• determining a 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;
• delaying, by the determined delay time, a timing of notifying the base station of the measured reception quality;
• acquiring a moving speed of the mobile station;
• and
• changing the distance between the first and second antennas, while maintaining a direction from the first antenna, to the second antenna, to make the 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, wherein
• the first antenna is coupled to a duplicator for transmitting and receiving radio signals;
• and
• the second antenna is coupled to a processor for processing a radio signal received via the second antenna.

A method of a base station communicating with a mobile station that includes first and second antennas with a distance therebetween and that moves in a direction from a location of the first antenna toward a location of the second antenna, the method comprising:

• receiving a notification of a reception quality from the mobile station, the reception quality being measured by the mobile station on a radio signal that is transmitted by the base station and received by the mobile station via the second antenna;
• performing adaptive modulation control on a transmission signal based on the reception quality;
• and
• transmitting the transmission signal in accordance with the adaptive modulation control to allow reception thereof by the mobile station via the first antenna, wherein
• the first antenna is coupled to a duplicator for transmitting and receiving radio signals;
• the second antenna is coupled to a processor for processing a radio signal received via the second antenna;
• and
• the mobile station is configured to:
• determine a 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 delay time, a 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 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.