2.1 DL/UL BPL indication through RS resource indicator: a method of sharing a related BPL by providing notification of the resource of an RS used for DL BM or UL BM. For example, it is assumed that a CSI-RS is used for DL BM and an SRS is used for UL BM. In this case, if a DL-UL reciprocal beam association has been activated, a base station may share information about which BPL will be used with a terminal by notifying the terminal of a CSI-RS resource indicator (CRI). In this case, a method of providing notification of a given BPL by combining a CRI and a CSI-RS port may be used in addition to using only the CRI. In contrast, if a DL-UL reciprocal beam association has not been activated, a base station may share information about which BPL will be used with a terminal by notifying the terminal of an SRS resource indicator (SRI). In this case, a method of providing notification of a given BPL by combining an SRI and an SRS port may be used in addition to using only the SRI. Even in the case of an UL-DL reciprocal beam association, indication having the same format as that described above is possible. Although different RSs are used for DL BM and UL BM, BPL information may be notified using an RS resource and an RS port using the same method.

2.2 DL/UL BPL indication through BPL index indication: a method of sharing BPLs to be used for DL transmission and UL transmission by providing notification of the index of the BPL established through BM. If the case of FIG. 1 is taken as an example, the method is a method in which the number of BPLs formed between the base station and the terminal is three and the base station notifies the terminal of the index of a BPL that belongs to the BPL #1 to the BPL #3 and that is activated for DL BPL indication or UL BPL indication.