At operation 740, the base station may transmit indication regarding whether an UL-based DL beam association has been activated to the terminal. The indication may indicate the activation of the UL-based DL beam association. For a detailed operation, reference is made to the method of transmitting indication regarding whether an UL-based DL beam association has been activated, which has been described in the third embodiment. If the UL-based DL beam association has been activated, the base station may transmit an UL BM-based DL BPL indication to the terminal at operation 745. For a detailed method of transmitting the DL BPL indication, reference is made to the operation of the third embodiment. Operation 740 and operation 745 are different in the contents of the indications. The indications of operations 740 and 745 may be included in a single message and transmitted or may be included in different messages and transmitted.

After operation 735 or operation 745, the base station may transmit a DL signal, data, an RS or a channel to the terminal based on the indicated DL BPL at operation 750.

FIG. 7B is a diagram showing a procedure of a terminal for an UL-based beam association according to a third embodiment of the disclosure. At operation 755, the terminal may transmit information indicating whether the BC of the terminal has been established to a base station. At operation 760, the terminal performs UL BM along with the base station. The terminal may perform the UL BM based on the indication of the base station. The base station may obtain at least one BPL as a result of the execution of the UL BM.