Referring to FIG. 5B, at operation 551 the terminal may transmit information indicating whether the BC of the terminal has been established to a base station. At operation 553, the terminal may receive indication regarding whether a DL-UL reciprocal beam association has been activated from the base station. At operation 555, the terminal determines whether a DL-based UL beam association is applied. If the DL-based UL beam association is applied, the terminal proceeds to operation 581. If the DL-based UL beam association is not applied, the terminal proceeds to operation 557. At operation 557, the terminal determines whether an UL-based DL beam association is applied. If the UL-based DL beam association is supported, the terminal proceeds to operation 571. If the UL-based DL beam association is not supported, the terminal proceeds to operation 559.

If the DL-UL reciprocal beam association is not supported, the terminal performs DL BM along with the base station at operation 559. At operation 561, the terminal performs UL BM along with the base station. At operation 563, the terminal receives DL BM-based DL BPL indication and UL BM-based UL BPL indication. At operation 565, the terminal may receive a DL signal, a channel, data or control information from the base station based on the DL BM-based DL BPL indication, and may transmit an UL signal, a channel, data or control information to the base station based on the UL BM-based UL BPL indication.