A base station of a wireless communication system using a time division duplex, TDD, scheme, the base station comprising: a communication module; and a processor configured to control the communication module, wherein the processor is configured to: generate a preemption indicator indicating a preempted resource within a predetermined period which includes a first plurality of orthogonal frequency division multiplexing, OFDM, symbols which comprise UL symbols for uplink transmission, DL symbols for downlink transmission, and flexible symbols configured as neither a UL symbol nor a DL symbol, wherein the UL symbols, the DL symbols, and the flexible symbols are configured by the base station, and transmit the preemption indicator to a user equipment of the wireless communication system based on the predetermined period, wherein the preemption indicator indicates the preempted resource among a second plurality of OFDM symbols which are OFDM symbols included in the first plurality of OFDM symbols except for a UL symbol configured by a cell specific radio resource control, RRC, signal, wherein the second plurality of OFDM symbols include a UL symbol configured by a user equipment, UE specific RRC signal, wherein the second plurality of OFDM symbols are divided into a plurality of groups, wherein a number of the plurality of groups is predetermined, wherein the preemption indicator includes a bitmap, each of bits in the bitmap corresponding to each of the plurality of groups and indicating whether or not at least one OFDM symbol in a corresponding group is preempted, and wherein a flexible symbol configured by the cell specific RRC signal is additionally configured as a DL symbol or a UL symbol by the UE specific RRC signal. a communication module; and a processor configured to control the communication module, wherein the processor is configured to: generate a preemption indicator indicating a preempted resource within a predetermined period which includes a first plurality of orthogonal frequency division multiplexing, OFDM, symbols which comprise UL symbols for uplink transmission, DL symbols for downlink transmission, and flexible symbols configured as neither a UL symbol nor a DL symbol, wherein the UL symbols, the DL symbols, and the flexible symbols are configured by the base station, and transmit the preemption indicator to a user equipment of the wireless communication system based on the predetermined period, wherein the preemption indicator indicates the preempted resource among a second plurality of OFDM symbols which are OFDM symbols included in the first plurality of OFDM symbols except for a UL symbol configured by a cell specific radio resource control, RRC, signal, wherein the second plurality of OFDM symbols include a UL symbol configured by a user equipment, UE specific RRC signal, wherein the second plurality of OFDM symbols are divided into a plurality of groups, wherein a number of the plurality of groups is predetermined, wherein the preemption indicator includes a bitmap, each of bits in the bitmap corresponding to each of the plurality of groups and indicating whether or not at least one OFDM symbol in a corresponding group is preempted, and wherein a flexible symbol configured by the cell specific RRC signal is additionally configured as a DL symbol or a UL symbol by the UE specific RRC signal. generate a preemption indicator indicating a preempted resource within a predetermined period which includes a first plurality of orthogonal frequency division multiplexing, OFDM, symbols which comprise UL symbols for uplink transmission, DL symbols for downlink transmission, and flexible symbols configured as neither a UL symbol nor a DL symbol, wherein the UL symbols, the DL symbols, and the flexible symbols are configured by the base station, and transmit the preemption indicator to a user equipment of the wireless communication system based on the predetermined period, wherein the preemption indicator indicates the preempted resource among a second plurality of OFDM symbols which are OFDM symbols included in the first plurality of OFDM symbols except for a UL symbol configured by a cell specific radio resource control, RRC, signal, wherein the second plurality of OFDM symbols include a UL symbol configured by a user equipment, UE specific RRC signal, wherein the second plurality of OFDM symbols are divided into a plurality of groups, wherein a number of the plurality of groups is predetermined, wherein the preemption indicator includes a bitmap, each of bits in the bitmap corresponding to each of the plurality of groups and indicating whether or not at least one OFDM symbol in a corresponding group is preempted, and wherein a flexible symbol configured by the cell specific RRC signal is additionally configured as a DL symbol or a UL symbol by the UE specific RRC signal.