Wireless communication device, mobile phone and wireless communication device control method
A wireless communication device includes a reference value acquiring unit configured to receive from a base station a timing adjustment value for use in adjusting a timing, and acquire a reference value associated with the received timing adjustment value, the reference value being a threshold for determining whether a transmission power is excessive, a variation acquiring unit configured to receive a transmission power control command transmitted by the base station, and sequentially acquire a variation in transmission power from the command, and a transmission power calculator configured to vary a transmission power value on the basis of the variation in transmission power when the transmission power value does not exceed the reference value, and configured to vary the transmission power value on the basis of a variation less than the variation in transmission power when the transmission power value exceeds the reference value.
1. A wireless communication device comprising:
a reference value acquiring unit configured to receive from a base station a timing adjustment value for use in adjusting a timing at which a transmission signal is to be transmitted, and acquire a reference value associated with the received timing adjustment value, the reference value being a threshold for determining whether a transmission power is excessive;
a variation acquiring unit configured to receive a transmission power control command transmitted by the base station at each given timing, and sequentially acquire a variation in transmission power from the received transmission power control command; and
a transmission power calculator configured to vary a transmission power value on the basis of the variation in transmission power acquired by the variation acquiring unit when the transmission power value does not exceed the reference value acquired by the reference value acquiring unit, and configured to vary the transmission power value on the basis of a variation less than the variation in transmission power acquired by the variation acquiring unit when the transmission power value exceeds the reference value acquired by the reference value acquiring unit.
2. The wireless communication device according to claim 1 ,
wherein the transmission power calculator determines whether the transmission power value exceeds the reference value when an increase in transmission power value in a given period exceeds a given value.
3. The wireless communication device according to claim 1 ,
wherein the transmission power calculator uses a predetermined value as the variation less than the variation in transmission power acquired by the variation acquiring unit.
4. The wireless communication device according to claim 1 ,
wherein the transmission power calculator uses a value of a given percentage of the variation in transmission power acquired by the variation acquiring unit, as the variation less than the variation in transmission power acquired by the variation acquiring unit.
5. A mobile phone comprising:
a wireless communication unit configured to transmit and receive data to and from a base station; and
a base band processing unit configured to perform base band processing of the data received and to be transmitted by the wireless communication unit, the base band processing unit including
a reference value acquiring unit configured to receive from the base station a timing adjustment value for use in adjusting a timing at which a transmission signal is to be transmitted, and acquire a reference value associated with the received timing adjustment value, the reference value being a threshold for determining whether transmission power is excessive,
a variation acquiring unit configured to receive a transmission power control command transmitted by the base station at each given timing, and sequentially acquire a variation in transmission power from the received transmission power control command, and
a transmission power calculator configured to vary a transmission power value on the basis of the variation in transmission power acquired by the variation acquiring unit when the transmission power value does not exceed the reference value acquired by the reference value acquiring unit, and configured to vary the transmission power value on the basis of a variation less than the variation in transmission power acquired by the variation acquiring unit if the transmission power value exceeds the reference value acquired by the reference value acquiring unit.
6. A method of controlling a wireless communication device, the method comprising causing the wireless communication device to perform:
receiving from a base station a timing adjustment value for use in adjusting a timing at which a transmission signal is to be transmitted;
acquiring a reference value associated with the received timing adjustment value, the reference value being a threshold for determining whether transmission power is excessive;
receiving a transmission power control command transmitted by the base station at each given timing, and sequentially acquiring a variation in transmission power from the received transmission power control command;
varying a transmission power value on the basis of the acquired variation in transmission power when the transmission power value does not exceed the reference value; and
varying the transmission power value on the basis of a variation less than the acquired variation in transmission power when the transmission power value exceeds the reference value.