Communication method and apparatus

1 . A method, comprising:

determining, by a terminal device, N1 hybrid automatic repeat request (HARQ) feedback disabling processes corresponding to a first uplink feedback slot, wherein N1 is a positive integer; and

determining, by the terminal device based on N1 pieces of downlink control information (DCI) corresponding to the N1 HARQ feedback disabling processes, whether to perform HARQ feedback in the first uplink feedback slot, wherein the N1 HARQ feedback disabling processes one-to-one correspond to the N1 pieces of DCI.

2 . The method according to claim 1 , wherein determining, by the terminal device based on the N1 pieces of DCI corresponding to the N1 HARQ feedback disabling processes, whether to perform HARQ feedback in the first uplink feedback slot comprises:

when a first field in each of the N1 pieces of DCI is a first value, determining, by the terminal device, not to perform HARQ feedback in the first uplink feedback slot.

3 . The method according to claim 2 , wherein the first field in each of the N1 pieces of DCI is a downlink assignment index (DAI) field, and the first value is 1 for all bits of the respective first field.

4 . The method according to claim 2 , wherein the first field in each of the N1 pieces of DCI comprises one or more of the following fields:

a new data indicator (NDI), a redundancy version (RV), a transmit power control command for scheduled physical uplink control channel (PUCCH), a PUCCH resource indicator, a physical downlink shared channel (PDSCH) to HARQ feedback timing indicator, or a DAI.

5 . The method according to claim 1 , wherein determining, by the terminal device based on the N1 pieces of DCI corresponding to the N1 HARQ feedback disabling processes, whether to perform HARQ feedback in the first uplink feedback slot comprises:

when a first field in one or more of the N1 pieces of DCI is not a first value, determining, by the terminal device, to perform HARQ feedback in the first uplink feedback slot.

6 . The method according to claim 5 , further comprising:

when all received data scheduled by the N1 pieces of DCI is on HARQ feedback disabling processes, determining, by the terminal device, a size of a HARQ codebook based on a sum of change amplitudes of downlink assignment index (DAI) fields in the N1 pieces of DCI; and

performing, by the terminal device, HARQ feedback in the first uplink feedback slot based on the size of the HARQ codebook.

7 . The method according to claim 1 , wherein the N1 pieces of DCI indicate a quantity N2 of HARQ feedback enabling processes corresponding to the first uplink feedback slot, and N2 is a nonnegative integer; and

wherein:

when a first field in each of the N1 pieces of DCI is the first value, it indicates that N2 is 0; or

when the first field in the one or more of the N1 pieces of DCI is not the first value, it indicates that N2 is greater than 0.

8 . A method, comprising:

determining, by a network device, M hybrid automatic repeat request (HARQ) feedback disabling processes corresponding to a first uplink feedback slot, wherein M is a positive integer; and

configuring, by the network device, M pieces of downlink control information (DCI) corresponding to the M HARQ feedback disabling processes, wherein the M pieces of DCI indicate whether to perform HARQ feedback in the first uplink feedback slot, and the M HARQ feedback disabling processes one-to-one correspond to the M pieces of DCI.

9 . The method according to claim 8 , wherein configuring, by the network device, the M pieces of DCI corresponding to the M HARQ feedback disabling processes comprises:

when a quantity N2 of HARQ feedback enabling processes corresponding to the first uplink feedback slot is 0, setting a first field in each of the M pieces of DCI to a first value; or

when a quantity N2 of HARQ feedback enabling processes corresponding to the first uplink feedback slot is 0, setting a first field in one or more of the M pieces of DCI to be other than a first value.

10 . The method according to claim 9 , wherein:

the first field in each of the M pieces of DCI being the first value indicates to a terminal device not to perform HARQ feedback in the first uplink feedback slot; and

the first field in the one or more of the M pieces of DCI not being the first value indicates to the terminal device to perform HARQ feedback in the first uplink feedback slot.

11 . The method according to claim 9 , wherein the first field in each of the M pieces of DCI is a downlink assignment index (DAI) field, and the first value is 1 for all bits of the respective first field.

12 . The method according to claim 9 , wherein the first field in each of the M pieces of DCI comprises one or more of the following fields:

a new data indicator (NDI), a redundancy version (RV), a transmit power control command for scheduled physical uplink control channel (PUCCH), a PUCCH resource indicator, physical downlink shared channel (PDSCH) to HARQ feedback timing indicator, or a downlink assignment index (DAI).

13 . An apparatus, comprising:

an interface circuit; and

a processor, wherein the processor and the interface circuit are coupled to each other, the processor is configured to:

determine N1 hybrid automatic repeat request (HARQ) feedback disabling processes corresponding to a first uplink feedback slot, wherein N1 is a positive integer; and

determine, based on N1 pieces of downlink control information (DCI) corresponding to the N1 HARQ feedback disabling processes, whether to perform HARQ feedback in the first uplink feedback slot, wherein the N1 HARQ feedback disabling processes one-to-one correspond to the N1 pieces of DCI.

14 . The apparatus according to claim 13 , wherein determining, based on the N1 pieces of DCI corresponding to the N1 HARQ feedback disabling processes, whether to perform HARQ feedback in the first uplink feedback slot comprises:

when a first field in each of the N1 pieces of DCI is a first value, determining not to perform HARQ feedback in the first uplink feedback slot.

15 . The apparatus according to claim 14 , wherein the first field in each of the N1 pieces of DCI is a downlink assignment index (DAI) field, and the first value is 1 for all bits of the respective first field.

16 . The apparatus according to claim 14 , wherein the first field in each of the N1 pieces of DCI comprises one or more of the following fields:

a new data indicator (NDI), a redundancy version (RV), a transmit power control command for scheduled physical uplink control channel (PUCCH), a PUCCH resource indicator, a physical downlink shared channel (PDSCH) to HARQ feedback timing indicator, or a downlink assignment index (DAI).

17 . The apparatus according to claim 13 , wherein determining, based on the N1 pieces of DCI corresponding to the N1 HARQ feedback disabling processes, whether to perform HARQ feedback in the first uplink feedback slot comprises:

when a first field in one or more of the N1 pieces of DCI is not a first value, determining to perform HARQ feedback in the first uplink feedback slot.

18 . The apparatus according to claim 17 , wherein the processor is further configured to:

when all received data scheduled by the N1 pieces of DCI is on HARQ feedback disabling processes, determining a size of a HARQ codebook based on a sum of change amplitudes of downlink assignment index (DAI) fields in the N1 pieces of DCI; and

performing HARQ feedback in the first uplink feedback slot based on the size of the HARQ codebook.

19 . The apparatus according to claim 13 , wherein the N1 pieces of DCI indicate a quantity N2 of HARQ feedback enabling processes corresponding to the first uplink feedback slot, and N2 is a nonnegative integer; and

wherein:

when a first field in each of the N1 pieces of DCI is a first value, it indicates that N2 is 0; or

when the first field in the one or more of the N1 pieces of DCI is not the first value, it indicates that N2 is greater than 0.