Base station device, terminal device, wireless communication system, and communication method

A terminal device comprising:

• a receiver configured to receive notification information indicating whether a calculation method for determining a transmission power is either a first method or a second method, the first method using a relative value based on a previous value, the second method using an absolute value that is irrelevant to the previous value;
• a controller configured to determine a transmission power by using the calculation method which is determined in accordance with the notification information;
• and
• a transmitter configured to transmit a signal with the transmission power determined by the controller, wherein
• the controller is further configured to determine, according to a type of the signal being a first type, the calculation method from the first method and the second method, and
• the controller is further configured to determine, according to the type of the signal being a second type different from the first type, the calculation method from the first method and the second method.

A wireless communication system comprising:

• a base station device;
• and
• a terminal device configured to communicate the base station;
• the base station device is further configured to:
• determine whether a calculation method for determining a transmission power of the terminal device is either a first method or a second method, the first method using a relative value based on a previous value of the single term, the second method using an absolute value that is irrelevant to the previous value of the single term, and
• transmit, to the terminal device, notification information for notifying the calculation method determined by the controller, wherein
• the base station is further configured to:
• select, according to a type of signal transmitted by the terminal device being a first type, the calculation method to determine the transmission power of the terminal device from the first method and the second method, and
• select, according to the type of signal transmitted by the terminal device being a second type different from the first type, the calculation method to determine the transmission power of the terminal device from the first method and the second method.