Communication apparatus and communication method

A communication apparatus, comprising:

• circuitry configured to:
• receive a plurality of reference signals from a base station;
• execute a measurement for each of the plurality of reference signals received from the base station, wherein
• the plurality of reference signals is associated with a plurality of pieces of antenna information;
• select a first reference signal and a second reference signal of the plurality of reference signals based on a result of the measurement;
• transmit first notice of control information corresponding to the selected first reference signal to the base station prior to reception of a random access response from the base station in a random access procedure;
• and
• transmit a second notice of control information corresponding to a difference between the result of the measurement of the first reference signal and the result of the measurement of the second reference signal to the base station subsequent to the reception of the random access response from the base station.

A communication method, comprising:

• controlling transmission of a plurality of reference signals associated with a plurality of pieces of antenna information to a terminal apparatus;
• acquiring control information corresponding to at least one of the plurality of reference signals from the terminal apparatus subsequent to a transmission of a random access response in a random access procedure to the terminal apparatus, wherein
• the plurality of reference signals includes a reference signal;
• and
• controlling communication of a transmission signal with the terminal apparatus based on antenna information of the plurality of pieces of antenna information corresponding to the acquired control information, wherein
• the reference signal is communicated to the terminal apparatus at a first timing,
• the transmission signal is communicated to the terminal apparatus at a second timing after the first timing, and
• a directivity of the transmission signal is higher than a directivity of the reference signal.

A communication method, comprising:

• receiving a plurality of reference signals from a base station;
• executing a measurement for each of the plurality of reference signals received from the base station, wherein
• the plurality of reference signals is associated with a plurality of pieces of antenna information;
• selecting a first reference signal and a second reference signal of the plurality of reference signals based on a result of the measurement;
• transmitting a first notice of control information corresponding to the selected first reference signal to the base station prior to reception of a random access response from the base station in a random access procedure;
• and
• transmitting a second notice of control information corresponding to a difference between the result of the measurement of the first reference signal and the result of the measurement of the second reference signal to the base station subsequent to the reception of the random access response from the base station.

A non-transitory computer-readable medium having stored thereon computer-executable instructions which, when executed by a processor of a communication apparatus, cause the processor to execute operations, the operations comprising:

• controlling transmission of a plurality of reference signals associated with a plurality of pieces of antenna information to a terminal apparatus;
• acquiring control information corresponding to at least one of the plurality of reference signals from the terminal apparatus subsequent to a transmission of random access response in a random access procedure to the terminal apparatus, wherein
• the plurality of reference signals includes a reference signal;
• and
• controlling communication of a transmission signal with the terminal apparatus based on antenna information of the plurality of pieces of antenna information corresponding to the acquired control information, wherein
• the reference signal is communicated to the terminal apparatus at a first timing,
• the transmission signal is communicated to the terminal apparatus at a second timing after the first timing, and
• a directivity of the transmission signal is higher than a directivity of the reference signal.

A non-transitory computer-readable medium having stored thereon computer-executable instructions which, when executed by a processor of a communication apparatus, cause the processor to execute operations, the operations comprising:

• receiving a plurality of reference signals from a base station;
• executing a measurement for each of the plurality of reference signals received from the base station, wherein
• the plurality of reference signals is associated with a plurality of pieces of antenna information;
• selecting a first reference signal and a second reference signal of the plurality of reference signals based on a result of the measurement;
• transmitting a first notice of control information corresponding to the selected first reference signal to the base station prior to reception of a random access response from the base station in a random access procedure;
• and
• transmitting a second notice of control information corresponding to a difference between the result of the measurement of the first reference signal and the result of the measurement of the second reference signal to the base station subsequent to the reception of the random access response from the base station.