Base station apparatus, terminal apparatus, and communication method

A terminal apparatus for communicating with a base station apparatus, the terminal apparatus comprising:

• a radio reception unit configured to receive multiple subframes from the base station apparatus;
• and
• a demodulation unit configured to demodulate the multiple subframes received,
• wherein the radio reception unit, in a case of communicating with the base station apparatus only in an unlicensed band, receives a preamble signal being a common signal in a cell by using an OFDM symbol in an anterior part of a first subframe of the multiple subframes,
• the demodulation unit demodulates a data signal from an OFDM symbol other than the preamble signal, and
• the preamble signal includes a cell-specific reference signal and a common downlink control channel.

A communication method of a base station apparatus for communicating with a terminal apparatus, the communication method comprising the steps of:

• securing a channel occupancy time by carrier sense;
• and
• transmitting at least one subframe in the channel occupancy time,
• wherein the transmitting includes, in a case of communicating with the terminal apparatus only in an unlicensed band, transmitting a preamble signal being a common signal by using a cell in an OFDM symbol in an anterior part of a first subframe of the at least one subframe.

A communication method of a terminal apparatus for communicating with a base station apparatus, the communication method comprising the steps of:

• wirelessly receiving multiple subframes from the base station apparatus;
• and
• demodulating the multiple subframes received,
• wherein the wirelessly receiving includes, in a case of communicating with the base station apparatus only in an unlicensed band, receiving a preamble signal being a common signal in a cell by using an OFDM symbol in an anterior part of a first subframe of the multiple subframes,
• the demodulating includes demodulating a data signal from an OFDM symbol other than the preamble signal, and
• the preamble signal includes a cell-specific reference signal and a common downlink control channel.