In combination with the abovementioned possible implementations of the first aspect, in a third possible implementation of the first aspect, the first time-frequency resource region may include a self-contained scheduling unit, and the self-contained scheduling unit may include a downlink transmission time period, an uplink and downlink switching time period and an uplink transmission time period.

In such case, optionally, the indication information may include information about the uplink and downlink switching time period in the self-contained scheduling unit; and the method may further include that: the terminal device determines the ending symbol of the first downlink data time-domain resource according to the information about the uplink and downlink switching time period.

In combination with the abovementioned possible implementations of the first aspect, in a fourth possible implementation of the first aspect, the operation that the terminal device receives the indication information from the network device may include that: the terminal device receives high-layer signaling from the network device, the high-layer signaling or a physical-layer common signal carrying the indication information; or the terminal device receives a physical-layer common signal from the network device, the physical-layer common signal carrying the indication information; or the terminal device receives a User Equipment (UE)-specific control signal from the network device, the UE-specific control signal carrying the indication information.

In combination with the abovementioned possible implementations of the first aspect, in a fifth possible implementation of the first aspect, the first downlink data time-domain resource may include multiple mini-slots.