User terminal

A radio communication method for a terminal, comprising:

• determining, based on higher layer signaling indicating transmission of message A including a random access preamble, whether or not to apply a 2-step contention-free random access procedure;
• when the 2-step contention-free random access procedure is applied, transmitting the message A;
• and
• receiving, as a response to the message A, message B including a downlink control channel received in a common search space set,
• wherein cyclic redundancy check (CRC) of downlink control information on the downlink control channel is scrambled by an identifier included in the message A.

A base station comprising:

• a processor that indicates, by using higher layer signaling indicating transmission of message A including a random access preamble, whether or not to apply a 2-step contention-free random access procedure;
• a receiver that, when the 2-step contention-free random access procedure is applied, receives the message A;
• and
• a transmitter that transmits, as a response to the message A, message B including a downlink control channel received in a common search space set,
• wherein cyclic redundancy check (CRC) of downlink control information on the downlink control channel is scrambled by an identifier included in the message A.

A system comprising a terminal and a base station, wherein

• the terminal comprises:
• a processor that determines, based on higher layer signaling indicating transmission of message A including a random access preamble, whether or not to apply a 2-step contention-free random access procedure;
• a transmitter that, when the 2-step contention-free random access procedure is applied, transmits the message A;
• and
• a receiver that receives, as a response to the message A, message B including a downlink control channel received in a common search space set,
• wherein cyclic redundancy check (CRC) of downlink control information on the downlink control channel is scrambled by an identifier included in the message A, and
• the base station comprises:
• a receiver that receives the message A;
• and
• a transmitter that transmits the message B.