Base station apparatus, terminal apparatus, and communication method

A base station apparatus configured to communicate with a terminal apparatus, the base station apparatus comprising:

• higher layer processing circuitry configured to configure a subcarrier spacing for the terminal apparatus;
• multiplexing circuitry configured to map a downlink shared channel to a resource element;
• and
• radio transmitting circuitry configured to generate an orthogonal frequency division multiplexing (OFDM) signal using a cyclic prefix (CP) and a signal output from the multiplexing circuitry, convert the OFDM signal into a radio signal, and transmit the radio signal, wherein
• the subcarrier spacing includes a first subcarrier spacing, a second subcarrier spacing, or a third subcarrier spacing,
• the CP includes a first CP, a second CP, or a third CP,
• in a same subcarrier spacing, the second CP is longer in length than the first CP,
• in a same subcarrier spacing, the third CP is shorter in length than the first CP,
• the first CP is used in the first subcarrier spacing,
• the first CP and the second CP are used in the second subcarrier spacing,
• at least the third CP is used in the third subcarrier spacing, and
• the third subcarrier spacing is equal to or larger than a predetermined number.

A terminal apparatus configured to communicate with a base station apparatus, the terminal apparatus comprising:

• higher layer processing circuitry configured to be configured with a subcarrier spacing;
• radio receiving circuitry configured to extract a frequency domain signal from a reception signal in consideration of a cyclic prefix (CP);
• demultiplexing circuitry configured to demultiplex a downlink shared channel from the frequency domain signal extracted;
• and
• signal detection circuitry configured to detect the downlink shared channel, wherein
• the subcarrier spacing includes a first subcarrier spacing, a second subcarrier spacing, or a third subcarrier spacing,
• the CP includes a first CP, a second CP, or a third CP,
• in a same subcarrier spacing, the second CP is longer in length than the first CP,
• in a same subcarrier spacing, the third CP is shorter in length than the first CP,
• the first CP is used in the first subcarrier spacing,
• the first CP and the second CP are used in the second subcarrier spacing,
• at least the third CP is used in the third subcarrier spacing, and
• the third subcarrier spacing is equal to or larger than a predetermined number.

A communication method for a base station apparatus to communicate with a terminal apparatus, the communication method comprising:

• configuring a subcarrier spacing for the terminal apparatus;
• mapping a downlink shared channel to a resource element;
• and
• generating an orthogonal frequency division multiplexing (OFDM) signal using a cyclic prefix (CP) and a signal output from the multiplexing circuitry, converting the OFDM signal into a radio signal, and transmitting the radio signal, wherein
• the subcarrier spacing includes a first subcarrier spacing, a second subcarrier spacing, or a third subcarrier spacing,
• the CP includes a first CP, a second CP, or a third CP,
• in a same subcarrier spacing, the second CP is longer in length than the first CP,
• in a same subcarrier spacing, the third CP is shorter in length than the first CP,
• the first CP is used in the first subcarrier spacing,
• the first CP and the second CP are used in the second subcarrier spacing,
• at least the third CP is used in the third subcarrier spacing, and
• the third subcarrier spacing is equal to or larger than a predetermined number.

A communication method for a terminal apparatus to communicate with a base station apparatus, the communication method comprising:

• being configured with a subcarrier spacing;
• extracting a frequency domain signal from a reception signal in consideration of a cyclic prefix (CP);
• demultiplexing a downlink shared channel from the frequency domain signal extracted;
• and
• detecting the downlink shared channel, wherein
• the subcarrier spacing includes a first subcarrier spacing, a second subcarrier spacing, or a third subcarrier spacing,
• the CP includes a first CP, a second CP, or a third CP,
• in a same subcarrier spacing, the second CP is longer in length than the first CP,
• in a same subcarrier spacing, the third CP is shorter in length than the first CP,
• the first CP is used in the first subcarrier spacing,
• the first CP and the second CP are used in the second subcarrier spacing,
• at least the third CP is used in the third subcarrier spacing, and
• the third subcarrier spacing is equal to or larger than a predetermined number.