Hybrid automatic repeat request feedback method and apparatus

A hybrid automatic repeat request (HARQ) feedback method, comprising:

• sending, by a second communication apparatus, first indication information, wherein the first indication information indicates a first quantity of retransmission of first data;
• and
• receiving, by the second communication apparatus, the first data by using a target quantity of retransmissions, wherein the target quantity of retransmissions is a smaller one of the first quantity of retransmissions and a second quantity of retransmissions, the second quantity of retransmissions is obtained by a terminal device based on a HARQ feedback result and/or a decoding result of second data, and the second data is data sent or received by the terminal device before the terminal device retransmits the first data;
• wherein the second quantity of retransmissions is determined based on a quantity of times that the second data is already repeatedly uploaded when an acknowledgment (ACK) is fed back.

A hybrid automatic repeat request (HARQ) feedback method, comprising:

• receiving, by a first communication apparatus, fourth indication information, wherein the fourth indication information indicates a service type of third data;
• determining, by the first communication apparatus based on a first mapping relationship, a first HARQ process group corresponding to the third data, wherein the first mapping relationship comprises a mapping relationship between the service type of the third data and the first HARQ process group;
• and
• sending, by the first communication apparatus, the third data through a first HARQ process, wherein the first HARQ process is a process in the first HARQ process group.