An expression method indicating the following various associations between RSs may be possible, but all indication operations are the same in that a beam obtained through a DL CSI-RS is applied to some of or the entire (UL SRS/UL DMRS/PUCCH/PUSCH/UL PTRS) UL transmission. The indication regarding whether a DL-based UL beam association has been activated may include both a semi-static indication method and a dynamic indication method. The semi-static indication method may be performed through higher layer signaling (e.g., radio resource control (RRC) signaling). The dynamic indication method may include the following indication methods:

a) Downlink control information (DCI) indication;

b) Medium access control (MAC) control element (CE) indication;

c) DCI+MAC CE indication; and

d) Indication through DCI field classification.

The DCI+MAC CE indication method is a method of indicating an association with a given RS through DCI and indicating an association with a different RS through an MAC CE. In a related embodiment, the PUCCH relation between a DL CSI-RS and an UL DMRS may be indicated through an MAC CE, and the PUSCH relation between a DL CSI-RS and an UL DMRS may be indicated through DCI. An indication method through the DCI field classification is a classification method of designing cases where UL BM (or an UL RS) and DL BM (or a DL RS) are used by classifying a DCI field. In other words, this indication method is a method for a base station to trigger different DCI fields for UL transmission so that a terminal is aware of whether it has to refer to which BM or RS.

2. UL BPL Indication