Terminal device, base station device, communication system, control method, and integrated circuit

A base station device configured to perform communication using a first cell group including a primary cell for a first base station device and a second cell group including a primary secondary cell for a second base station device, the base station device comprising:

• reception circuitry that receives a first Medium Access Control (MAC) control element;
• wherein
• in a first case where the primary secondary cell is added and a power headroom report is triggered:
• the reception circuitry receives a second MAC control element,
• the second MAC control element includes a first value of a first type of power headroom information for the primary cell and a second value of a second type of power headroom information for the primary secondary cell, the first value and the second value are respectively calculated in the primary cell and in the primary secondary cell.

A control method for a terminal device configured to perform communication using

• a first cell group including a primary cell for a first base station device and a second cell group including a primary secondary cell for a second base station device, the control method comprising:
• transmitting a first Medium Access Control (MAC) control element, wherein
• in a first case where the primary secondary cell is added,
• determining that a power headroom report is triggered,
• calculating a first value of a first type of power headroom information for the primary cell in the primary cell and a second value of a second type of power headroom information for the primary secondary cell in the primary secondary cell, respectively,
• generating a second MAC control element including the first type of power headroom information and the second type of power headroom information, and
• transmitting the second MAC control element.