FIG. 2 is a diagram illustrating a resource grid for one downlink slot in the wireless communication system to which the present disclosure can be applied.
Referring to FIG. 2, one downlink slot includes the plurality of OFDM symbols in the time domain. Herein, it is exemplarily described that one downlink slot includes 7 OFDM symbols and one resource block includes 12 subcarriers in the frequency domain, but the present disclosure is not limited thereto.
Each element on the resource grid is referred to as a resource element and one resource block includes 12×7 resource elements. The number of resource blocks included in the downlink slot, NDL is subordinated to a downlink transmission bandwidth.
A structure of the uplink slot may be the same as that of the downlink slot.
FIG. 3 illustrates a structure of a downlink subframe in the wireless communication system to which the present disclosure can be applied.
Referring to FIG. 3, a maximum of three former OFDM symbols in the first slot of the subframe is a control region to which control channels are allocated and residual OFDM symbols is a data region to which a physical downlink shared channel (PDSCH) is allocated. Examples of the downlink control channel used in the 3GPP LTE include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid-ARQ indicator channel (PHICH), and the like.
