Terminal, radio communication method, and base station

A radio communication method of a terminal, comprising:

• receiving a Medium Access Control Control Element (MAC CE) giving an instruction on activation of a transmission configuration indicator (TCI) state;
• and
• performing control to perform a communication operation using the TCI state after an offset period starting from at least one of a reception timing of the MAC CE and a transmission timing of a delivery confirmation signal for the MAC CE,
• wherein the offset period is determined based on whether or not a TCI state for use in a communication operation after the offset period is activated.

A base station comprising:

• a transmitter configured to transmit a Medium Access Control Control Element (MAC CE) giving an instruction on activation of a transmission configuration indicator (TCI) state;
• and
• a processor configured to determine that a communication operation using the TCI state is performed in the terminal after an offset period starting from at least one of a reception timing of the MAC CE and a transmission timing of a delivery confirmation signal for the MAC CE,
• wherein the processor determines the offset period based on whether or not a TCI state for use in a communication operation after the offset period is activated.

A system comprising a terminal and a base station, wherein:

• the terminal comprises:
• a receiver configured to receive a Medium Access Control Control Element (MAC CE) giving an instruction on activation of a transmission configuration indicator (TCI) state;
• and
• a processor configured to perform control to perform a communication operation using the TCI state after an offset period starting from at least one of a reception timing of the MAC CE and a transmission timing of a delivery confirmation signal for the MAC CE,
• wherein the processor determines the offset period based on whether or not a TCI state for use in a communication operation after the offset period is activated, and
• the base station comprises:
• a transmitter configured to transmit the MAC CE;
• and
• a processor configured to determine that a communication operation using the TCI state is performed in the terminal after an offset period starting from at least one of a reception timing of the MAC CE and a transmission timing of a delivery confirmation signal for the MAC CE.