A method for transmitting a physical uplink shared channel, PUSCH, signal by a user equipment, UE, in a cellular radio communication system supporting a carrier aggregation, CA, scheme, the method comprising: transmitting a PUSCH signal in a specific cell to a base station, BS, based on a PUSCH timing relationship for the specific cell according to cross-carrier scheduling, wherein the specific cell is a scheduled cell; wherein the UE is full-duplex and is configured with at least two carrier-aggregated cells including the specific cell, and Time Division Duplexing, TDD, uplink, UL/downlink, DL, configurations for the at least two carrier-aggregated cells are different, wherein the PUSCH timing relationship for the specific cell corresponds to a TDD UL/DL configuration among the TDD UL/DL configurations supported in the communication system, wherein the TDD UL/DL configuration is selected based on a combination of the TDD UL/DL configurations of all of the at least two carrier-aggregated cells configured for the UE and is selected to meet the following conditions: if the scheduled cell is one of TDD UL/DL configurations 1, 2, 3, 4 or 5, for cross-carrier scheduled PUSCHs having a same hybrid automatic repeat request, HARQ, Process Identifier, ID, serial numbers of sub-frames where PUSCH transmissions are located are the same, and the largest number of UL sub-frames is scheduled according to the PUSCH timing relationship corresponding to the selected TDD UL/DL configuration. transmitting a PUSCH signal in a specific cell to a base station, BS, based on a PUSCH timing relationship for the specific cell according to cross-carrier scheduling, wherein the specific cell is a scheduled cell; wherein the UE is full-duplex and is configured with at least two carrier-aggregated cells including the specific cell, and Time Division Duplexing, TDD, uplink, UL/downlink, DL, configurations for the at least two carrier-aggregated cells are different, wherein the PUSCH timing relationship for the specific cell corresponds to a TDD UL/DL configuration among the TDD UL/DL configurations supported in the communication system, wherein the TDD UL/DL configuration is selected based on a combination of the TDD UL/DL configurations of all of the at least two carrier-aggregated cells configured for the UE and is selected to meet the following conditions: if the scheduled cell is one of TDD UL/DL configurations 1, 2, 3, 4 or 5, for cross-carrier scheduled PUSCHs having a same hybrid automatic repeat request, HARQ, Process Identifier, ID, serial numbers of sub-frames where PUSCH transmissions are located are the same, and the largest number of UL sub-frames is scheduled according to the PUSCH timing relationship corresponding to the selected TDD UL/DL configuration. if the scheduled cell is one of TDD UL/DL configurations 1, 2, 3, 4 or 5, for cross-carrier scheduled PUSCHs having a same hybrid automatic repeat request, HARQ, Process Identifier, ID, serial numbers of sub-frames where PUSCH transmissions are located are the same, and the largest number of UL sub-frames is scheduled according to the PUSCH timing relationship corresponding to the selected TDD UL/DL configuration.