A method for scheduling transmission in a wireless communications system, comprising: determining (S121, S221), by a network device, a priority of each transmission time interval used for first-direction transmission in a transmission time interval set, wherein the first-direction transmission is along a downlink direction from the network device to user equipment or along an uplink direction from the user equipment to the network device; selecting (S122, S222), by the network device, for a first cell, at least one transmission time interval from the transmission time interval set based on the priority; and performing (S125, S225), by the network device, in the first cell, the first-direction transmission with the user equipment by using the selected at least one transmission time interval. wherein the method further comprises: sending, by the network device, at least two sets of power control parameters to the user equipment, wherein the power control parameters are used by the user equipment to calculate uplink transmit power; determining (S123, S223), by the network device, whether a transmission period of the first cell comprises a contradirectional interference transmission time interval, wherein the contradirectional interference transmission time interval is a transmission time interval that is configured for uplink transmission in the first cell and configured for downlink transmission in a second cell; and sending (S124, S224), by the network device, indication information to the user equipment based on a result of determining whether the contradirectional interference transmission time interval is comprised, wherein the indication information is used to indicate the result of determining whether the contradirectional interference transmission time interval is comprised and a power control parameter used by the user equipment to perform uplink transmission, wherein the indication information occupies one bit in downlink control information. determining (S121, S221), by a network device, a priority of each transmission time interval used for first-direction transmission in a transmission time interval set, wherein the first-direction transmission is along a downlink direction from the network device to user equipment or along an uplink direction from the user equipment to the network device; selecting (S122, S222), by the network device, for a first cell, at least one transmission time interval from the transmission time interval set based on the priority; and performing (S125, S225), by the network device, in the first cell, the first-direction transmission with the user equipment by using the selected at least one transmission time interval. wherein the method further comprises: sending, by the network device, at least two sets of power control parameters to the user equipment, wherein the power control parameters are used by the user equipment to calculate uplink transmit power; determining (S123, S223), by the network device, whether a transmission period of the first cell comprises a contradirectional interference transmission time interval, wherein the contradirectional interference transmission time interval is a transmission time interval that is configured for uplink transmission in the first cell and configured for downlink transmission in a second cell; and sending (S124, S224), by the network device, indication information to the user equipment based on a result of determining whether the contradirectional interference transmission time interval is comprised, wherein the indication information is used to indicate the result of determining whether the contradirectional interference transmission time interval is comprised and a power control parameter used by the user equipment to perform uplink transmission, wherein the indication information occupies one bit in downlink control information. sending, by the network device, at least two sets of power control parameters to the user equipment, wherein the power control parameters are used by the user equipment to calculate uplink transmit power; determining (S123, S223), by the network device, whether a transmission period of the first cell comprises a contradirectional interference transmission time interval, wherein the contradirectional interference transmission time interval is a transmission time interval that is configured for uplink transmission in the first cell and configured for downlink transmission in a second cell; and sending (S124, S224), by the network device, indication information to the user equipment based on a result of determining whether the contradirectional interference transmission time interval is comprised, wherein the indication information is used to indicate the result of determining whether the contradirectional interference transmission time interval is comprised and a power control parameter used by the user equipment to perform uplink transmission, wherein the indication information occupies one bit in downlink control information.