Terminal apparatus, base station apparatus, communication method and integrated circuit

A base station apparatus that communicates with a terminal apparatus, the base station apparatus comprising:

• higher-layer processing circuitry that transmits:
• first information indicating whether a subframe belongs to a first subframe set or a second subframe set,
• second information indicating a first parameter value, the first parameter value being used for setting of transmission power for transmission of a physical uplink shared channel,
• third information indicating a second parameter value, the second parameter value being used for setting of the transmission power for the transmission of the physical uplink shared channel, and
• fourth information indicating whether a transmission power control command accumulation is enabled or disabled,
• a power headroom is computed by:
• using a first set of parameter values, in a case that the subframe belongs to the first subframe set, the first set of parameter values comprising the first parameter value and a third parameter value,
• using a second set of parameter values, in a case that the subframe belongs to the second subframe set, the second set of parameter values comprising the second parameter value and a fourth parameter value, wherein,
• the third parameter value being given by a first formula determined based on the fourth information;
• and
• the fourth parameter value being given by a second formula determined based on the fourth information.

A communication method of a terminal device, the communication method comprising:

• receiving:
• first information indicating whether a subframe belongs to a first subframe set or a second subframe set,
• second information indicating a first parameter value, the first parameter value being used for setting of transmission power for transmission of a physical uplink shared channel,
• third information indicating a second parameter value, the second parameter value being used for setting of the transmission power for the transmission of the physical uplink shared channel, and
• fourth information indicating whether a transmission power control command accumulation is enabled or disabled,
• computing a power headroom:
• using a first set of parameter values, in a case that the subframe belongs to the first subframe set, the first set of parameter values comprising the first parameter value and a third parameter value,
• using a second set of parameter values, in a case that the subframe belongs to the second subframe set, the second set of parameter values comprising the second parameter value and a fourth parameter value, wherein,
• the third parameter value being given by a first formula determined based on the fourth information;
• and
• the fourth parameter value being given by a second formula determined based on the fourth information.

A communication method of a base station device, the communication method comprising:

• transmiting:
• first information indicating whether a subframe belongs to a first subframe set or a second subframe set,
• second information indicating a first parameter value, the first parameter value being used for setting of transmission power for transmission of a physical uplink shared channel,
• third information indicating a second parameter value, the second parameter value being used for setting of the transmission power for the transmission of the physical uplink shared channel, and
• fourth information indicating whether a transmission power control command accumulation is enabled or disabled,
• a power headroom is computed by:
• using a first set of parameter values, in a case that the subframe belongs to the first subframe set, the first set of parameter values comprising the first parameter value and a third parameter value,
• using a second set of parameter values, in a case that the subframe belongs to the second subframe set, the second set of parameter values comprising the second parameter value and a fourth parameter value, wherein,
• the third parameter value being given by a first formula determined based on the fourth information;
• and
• the fourth parameter value being given by a second formula determined based on the fourth information.