For example, an RRP interval consisting of M consecutive subframes (SF) may be configured. Alternatively, one RRP interval may be configured as a set of non-consecutive SFs (not shown). Here, the eNB may pre-inform the UE through higher layer signaling (e.g., RRC or MAC signaling) or a physical control/data channel of the value of M and the usage of the M SFs (using PCell). The start time of the RRP interval may be set periodically by higher layer signaling (e.g., RRC or MAC signaling). Alternatively, the start time of the RRP interval may be specified through physical layer signaling (e.g., (E)PDCCH) in SF #n or SF # (n?k) when the start time of the RRP interval needs to be set to SF #n. Here, k is a positive integer (e.g., 4).

The RRP may be configured such that the SF boundary and the SF number/index thereof are aligned with the PCell (FIG. 2) (hereinafter, “aligned-RRP”), or configured to support the format in which the SF boundary or the SF number/index is not aligned with the PCell (hereinafter, “floating-RRP”) (FIG. 13). In the present invention, the SF boundaries being aligned between cells may mean that the interval between SF boundaries of two different cells is shorter than or equal to a specific time (e.g., CP length or X μs (X≥0)). In addition, in the present invention, a PCell may refer to a cell that is referenced in order to determine the SF (and/or symbol) boundary of a UCell in terms of time (and/or frequency) synchronization.