A user equipment , UE, for use in a wireless communication system, the UE comprising: a communication module ; and a processor , wherein the processor is configured to: receive a radio resource control, RRC, signal including a slot format configuration related to a slot format, wherein the slot format configuration provides a number X of downlink symbols and a number Y of uplink symbols, and wherein the slot format is configured in an order of zero or more downlink symbols, one or more flexible symbols and zero or more uplink symbols, and the one or more flexible symbols are identified based on X and Y; monitor a group common physical downlink control channel, GC-PDCCH, including a slot format information; and when a set of symbols on which the UE is configured by a higher layer to transmit an uplink signal is within the one or more flexible symbols configured by the RRC signal, selectively perform a transmission of the uplink signal based on: 1) whether the GC-PDCCH is detected by the UE, and 2) whether the slot format information indicates the set of symbols as uplink, if the GC-PDCCH is detected by the UE. a communication module ; and a processor , wherein the processor is configured to: receive a radio resource control, RRC, signal including a slot format configuration related to a slot format, wherein the slot format configuration provides a number X of downlink symbols and a number Y of uplink symbols, and wherein the slot format is configured in an order of zero or more downlink symbols, one or more flexible symbols and zero or more uplink symbols, and the one or more flexible symbols are identified based on X and Y; monitor a group common physical downlink control channel, GC-PDCCH, including a slot format information; and when a set of symbols on which the UE is configured by a higher layer to transmit an uplink signal is within the one or more flexible symbols configured by the RRC signal, selectively perform a transmission of the uplink signal based on: 1) whether the GC-PDCCH is detected by the UE, and 2) whether the slot format information indicates the set of symbols as uplink, if the GC-PDCCH is detected by the UE. receive a radio resource control, RRC, signal including a slot format configuration related to a slot format, wherein the slot format configuration provides a number X of downlink symbols and a number Y of uplink symbols, and wherein the slot format is configured in an order of zero or more downlink symbols, one or more flexible symbols and zero or more uplink symbols, and the one or more flexible symbols are identified based on X and Y; monitor a group common physical downlink control channel, GC-PDCCH, including a slot format information; and when a set of symbols on which the UE is configured by a higher layer to transmit an uplink signal is within the one or more flexible symbols configured by the RRC signal, selectively perform a transmission of the uplink signal based on: 1) whether the GC-PDCCH is detected by the UE, and 2) whether the slot format information indicates the set of symbols as uplink, if the GC-PDCCH is detected by the UE. 1) whether the GC-PDCCH is detected by the UE, and 2) whether the slot format information indicates the set of symbols as uplink, if the GC-PDCCH is detected by the UE. <EOS>