Data transmission method, terminal device, and network device

A network device, comprising:

• a processor and memory storing program instructions;
• wherein the program instructions, when executed by the processor, cause the network device to:
• generate a slot format indicator (SFI), wherein the SFI is used to indicate one or more slot format indices, the one or more slot format indices being used to determine a slot format in a time unit based on a first correspondence relationship, wherein the first correspondence relationship is a relationship between a slot format index and a slot format;
• send the SFI to a terminal device;
• and
• send a physical downlink control channel (PDCCH) to the terminal device according to the slot format corresponding to the one of the one or more slot format indices indicated by the SFI, wherein the SFI is carried in downlink control information (DCI) and the DCI is scrambled by using a radio network temporary identifier (RNTI);
• wherein in response to that the time unit is one slot, the one or more slot format indices being used to determine the slot format in the time unit based on a first correspondence relationship comprises at least one of:
• determining that M symbols starting from a beginning in a slot as a time domain location used for downlink transmission, wherein M is a number of downlink symbols, and M is an integer greater than or equal to 0;
• or
• determining that last N symbols from an end in a slot as a time domain location used for uplink transmission, wherein N is the number of uplink symbols, and N is an integer greater than or equal to 0;
• or, wherein in response to that the time unit is a transmission period used for transmitting the DCI carrying the SFI and the transmission period comprises a plurality of slots, the SFI is used to indicate a slot structure corresponding to each slot in one transmission period, the one or more slot format indices being used to determine the slot format in the time unit based on a first correspondence relationship comprises at least one of:
• determining that M symbols starting from a first symbol in each slot in the transmission period as a time domain location used for downlink transmission in the slot, wherein M is the number of downlink symbols in the slot, and M is an integer greater than or equal to 0;
• or
• determining that last N symbols in each slot as a time domain location used for uplink transmission in the slot in the transmission period, wherein M is the number of uplink symbols in the slot, and N is an integer greater than or equal to 0,
• wherein M can be different for different slots in the transmission period, and N can be different for different slots in the transmission period.