Data transmission method and apparatus

A method, comprising:

• receiving, by a terminal device, first indication information from an access network device, wherein the first indication information indicates a first transmission mode, and the first transmission mode comprises a one-time transmission mode or an automatic repeat transmission mode;
• receiving, by the terminal device, second indication information from the access network device, wherein when the first indication information indicates the one-time transmission mode, the second indication information indicates first transmission information of M coded data blocks, wherein M≥2, and wherein when the first indication information indicates the automatic repeat transmission mode, the second indication information indicates second transmission information of acknowledgement information or negative acknowledgement information;
• and
• receiving, by the terminal device, service data from the access network device using the first transmission mode indicated by the first indication information, wherein receiving, by the terminal device, the service data from the access network device using the first transmission mode indicated by the first indication information comprises:
• when the indicated first transmission mode is the one-time transmission mode, performing the following:
• receiving, by the terminal device, the M coded data blocks from the access network device, and
• decoding, by the terminal device, at least one of the M coded data blocks;
• or
• when the indicated transmission mode is the automatic repeat transmission mode, performing the following:
• attempting to receive, by the terminal device, at least one first coded data block from the access network device;
• when the at least one first coded data is successfully received, attempting to decode, by the terminal device, the at least one first coded data block;
• sending, by the terminal device, acknowledgement information or negative acknowledgement information corresponding to the at least one first coded data block to the access network device;
• and
• when the at least one first coded data block fails to be received or fails to be decoded, receiving, by the terminal device, at least one second coded data block from the access network device, and decoding, by the terminal device, the at least one second coded data block.

A terminal device, comprising:

• a transceiver, configured to:
• receive first indication information from an access network device, wherein the first indication information indicates a first transmission mode, and the transmission mode comprises a one-time transmission mode or an automatic repeat transmission mode;
• receive second indication information from the access network device, wherein when the first indication information indicates the one-time transmission mode, the second indication information indicates first transmission information of M coded data blocks, wherein M≥2, and wherein when the first indication information indicates the automatic repeat transmission mode, the second indication information indicates second transmission information of acknowledgement information or negative acknowledgement information;
• and
• at least one processor, configured to control the transceiver to receive service data from the access network device using the first transmission mode indicated by the first indication information, wherein receiving the service data from the access network device using the first transmission mode indicated by the first indication information comprises:
• when the indicated first transmission mode is the one-time transmission mode, performing the following:
• receiving the M coded data blocks from the access network device, and
• decoding at least one of the M coded data blocks;
• or
• when the indicated transmission mode is the automatic repeat transmission mode, performing the following:
• attempting to receive at least one first coded data block from the access network device;
• when the at least one first coded data is successfully received, attempting to decode the at least one first coded data block;
• sending acknowledgement information or negative acknowledgement information corresponding to the at least one first coded data block to the access network device;
• and
• when the at least one first coded data block fails to be received or fails to be decoded, receiving at least one second coded data block from the access network device, and decoding the at least one second coded data block.