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

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

• transmission circuitry configured to transmit one or multiple reference signals, transmit first information for identifying one or multiple random access channel occasions, and transmit second information for identifying an index of a random access preamble, to the terminal apparatus;
• and
• monitoring circuitry configured to
• in a case that a first condition is satisfied, monitor the random access preamble transmitted from the terminal apparatus in a random access channel occasion of the one or multiple random access channel occasions assigned for each of the one or multiple reference signals, and
• in a case that a second condition is satisfied, monitor the random access preamble transmitted from the terminal apparatus in the random access channel occasion assigned for one of the one or multiple reference signals associated with a physical downlink control channel used to transmit the second information.

A communication method used for a terminal apparatus, the communication method comprising:

• receiving first information for identifying one or multiple random access channel occasions, and receiving second information for identifying an index of a random access preamble;
• in a case that a first condition is satisfied, selecting, from one or multiple reference signals, one reference signal based on a measurement of each of the one or multiple reference signals;
• in a case that a second condition is satisfied, selecting one reference signal associated with a physical downlink control channel used to receive the second information;
• and
• selecting, from the one or multiple random access channel occasions, one random access channel occasion associated with the one reference signal selected.

A communication method used for a base station apparatus, the communication method comprising:

• transmitting one or multiple reference signals, transmitting first information for identifying one or multiple random access channel occasions, and transmitting second information for identifying an index of a random access preamble, to a terminal apparatus;
• in a case that a first condition is satisfied, monitoring the random access preamble transmitted from the terminal apparatus 1 in a random access channel occasion of the one or multiple random access channel occasions assigned for each of the one or multiple reference signals;
• and
• in a case that a second condition is satisfied, monitoring the random access preamble transmitted from the terminal apparatus in the random access channel occasion assigned for one of the one or multiple reference signals associated with a physical downlink control channel used to transmit the second information.

An integrated circuit to be mounted on a terminal apparatus, the integrated circuit causing the terminal apparatus to perform:

• receiving first information for identifying one or multiple random access channel occasions, and receiving second information for identifying an index of a random access preamble;
• and
• in a case that a first condition is satisfied, selecting, from one or multiple reference signals, one reference signal based on a measurement of each of the one or multiple reference signals,
• in a case that a second condition is satisfied, selecting one reference signal associated with a physical downlink control channel used to receive the second information, and
• selecting, from the one or multiple random access channel occasions, one random access channel occasion associated with the one reference signal selected.

An integrated circuit to be mounted on a base station apparatus, the integrated circuit causing the base station apparatus to perform:

• transmitting one or multiple reference signals, transmitting first information for identifying one or multiple random access channel occasions, and transmitting second information for identifying an index of a random access preamble, to a terminal apparatus;
• and
• in a case that a first condition is satisfied, monitoring the random access preamble transmitted from the terminal apparatus 1 in a random access channel occasion of the one or multiple random access channel occasions assigned for each of the one or multiple reference signals, and
• in a case that a second condition is satisfied, monitoring the random access preamble transmitted from the terminal apparatus in the random access channel occasion assigned for one of the one or multiple reference signals associated with a physical downlink control channel used to transmit the second information.