FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain of a long-term evolution (LTE) system, which is a radio resource domain in which data or control information is transmitted according to an embodiment of the disclosure;
FIG. 2 is a diagram illustrating a physical downlink control channel (PDCCH) which is a downlink physical channel in which downlink channel information (DCI) of LTE is transmitted according to an embodiment of the disclosure;
FIG. 3 is a diagram illustrating a basic unit of time and frequency resources constituting a downlink control channel available in a 5G or 6G communication system according to an embodiment of the disclosure;
FIG. 4 is a diagram illustrating a control region, i.e., control resource set, CORESET, in a 5G or 6G wireless communication system, in which a downlink control channel is transmitted according to an embodiment of the disclosure;
FIG. 5 illustrates a case in which a user equipment (UE) is set to use fourteen orthogonal frequency division multiplexing (OFDM) symbols as one slot (or subframe) in a downlink, a PDCCH is transmitted in two initial OFDM symbols, and a demodulation reference signal (DMRS) is transmitted in a third symbol according to an embodiment of the disclosure;
FIG. 6 is a diagram illustrating a concept of a method of communicating with a UE by using a frequency resource of a second mobile communication provider, the method being performed by a first base station of a first mobile communication provider according to an embodiment of the disclosure;
