Hybrid automatic repeat request (HARQ) information transmission method and apparatus

1. A hybrid automatic repeat request (HARQ) information transmission method, comprising:

receiving, by a terminal device of at least two terminal devices, mapping resource indication information, wherein the mapping resource indication information indicates information about a mapping resource allocated to the terminal device for mapping HARQ modulation symbols, wherein the at least two terminal devices transmit information by using a same time-frequency resource, wherein the mapping resource allocated to the terminal device indicates resource elements (REs) in the same time-frequency resource, and wherein the mapping resource allocated to the terminal device is different from a mapping resource allocated to another terminal device of the at least two terminal devices;

modulating, by the terminal device, encoded HARQ information according to a codebook to generate the HARQ modulation symbols, wherein the HARQ modulation symbols comprise at least one non-zero HARQ modulation symbol and at least one zero HARQ modulation symbol, wherein the at least one non-zero HARQ modulation symbol corresponds to at least one non-zero element, and the at least one non-zero element indicates that elements of code words in a corresponding codebook are not all zero, wherein the at least one zero HARQ modulation symbol corresponds to at least one zero element, and the at least one zero element indicates that elements of code words in a corresponding codebook are zero, wherein the codebook comprises at least two code words, wherein the code words are multi-dimensional complex vectors, and wherein the code words used to indicate a mapping relationship between the encoded HARQ information and at least two modulation symbols;

performing, by the terminal device, resource mapping on the HARQ modulation symbols according to the mapping resource indication information; and

sending, by the terminal device, the HARQ modulation symbols to a network device.

2. The method according to claim 1 , wherein the HARQ modulation symbols are mapped to one side or two sides of a modulation symbol of a demodulation reference signal (DMRS).

3. A hybrid automatic repeat request (HARQ) information transmission method, comprising:

sending, by a network device, mapping resource indication information, wherein the mapping resource indication information indicates information about a mapping resource allocated to a terminal device of at least two terminal devices for mapping HARQ modulation symbols, wherein the at least two terminal devices transmit information by using a same time-frequency resource, wherein the mapping resource allocated to the terminal device indicates resource elements (REs) in the same time-frequency resource, and wherein the mapping resource allocated to the terminal device is different from a mapping resource allocated to another terminal device of the at least two terminal devices; and

receiving, by the network device, the HARQ modulation symbols on which the terminal device performed resource mapping according to the mapping resource indication information.

4. The method according to claim 3 , wherein the HARQ modulation symbols are mapped to one side or two sides of a modulation symbol of a demodulation reference signal (DMRS).

5. The method according to claim 3 , wherein the mapping resource indication information comprises identifiers of the at least two terminal devices and a quantity of bits of to-be-sent HARQ information of each terminal device of the at least two terminal devices.

6. The method according to claim 3 , wherein the mapping resource indication information comprises information about a start location of a subcarrier allocated to each terminal device of the at least two terminal devices and a quantity of bits of to-be-sent HARQ information of each terminal device of the at least two terminal devices.

7. The method according to claim 3 , wherein the mapping resource indication information comprises identifiers of the at least two terminal devices, information about a quantity of the at least two terminal devices, and a quantity of bits of a to-be-sent HARQ signal of each terminal device of the at least two terminal devices.

8. A terminal device, comprising a processor and a non-transitory memory having instructions stored thereon, wherein the instructions, when executed by the processor, facilitate:

receiving, by the terminal device, mapping resource indication information, wherein the mapping resource indication information indicates information about a mapping resource allocated to the terminal device for mapping hybrid automatic repeat request (HARQ) modulation symbols, wherein the terminal device is one of at least two terminal devices, wherein the at least two terminal devices transmit information by using a same time-frequency resource, wherein the mapping resource allocated to the terminal device indicates resource elements (REs) in the same time-frequency resource, and wherein the mapping resource allocated to the terminal device is different from a mapping resource allocated to another terminal device of the at least two terminal devices;

modulating, by the terminal device, encoded HARQ information according to a codebook to generate the HARQ modulation symbols, wherein the HARQ modulation symbols comprise at least one non-zero HARQ modulation symbol and at least one zero HARQ modulation symbol, wherein the at least one non-zero HARQ modulation symbol corresponds to at least one non-zero element, and the at least one non-zero element indicates that elements of code words in a corresponding codebook are not all zero, wherein the at least one zero HARQ modulation symbol corresponds to at least one zero element, and the at least one zero element indicates that elements of code words in a corresponding codebook are zero, wherein the codebook comprises at least two code words, wherein the code words are multi-dimensional complex vectors, and wherein the code words indicate a mapping relationship between the encoded HARQ information and at least two modulation symbols;

performing, by the terminal device, resource mapping on the HARQ modulation symbols according to the mapping resource indication information; and

sending, by the terminal device, the HARQ modulation symbols to a network device.

9. The terminal device according to claim 8 , wherein the HARQ modulation symbols are mapped to one side or two sides of a modulation symbol of a demodulation reference signal (DMRS).

10. A network device, comprising a processor and a non-transitory memory having instructions stored thereon, wherein the instructions, when executed by the processor, facilitate:

sending, by the network device, mapping resource indication information, wherein the mapping resource indication information indicates information about a mapping resource allocated to a terminal device of at least two terminal devices for mapping hybrid automatic repeat request (HARQ) modulation symbols, wherein the at least two terminal devices transmit information by using a same time-frequency resource, wherein the mapping resource allocated to the terminal device indicates resource elements (REs) in the same time-frequency resource, and wherein the mapping resource allocated to the terminal device is different from a mapping resource allocated to another terminal device of the at least two terminal devices; and

receiving, by the network device, the HARQ modulation symbols on which the terminal device performed resource mapping according to the mapping resource indication information.

11. The network device according to claim 10 , wherein the HARQ modulation symbols are mapped to one side or two sides of a modulation symbol of a demodulation reference signal (DMRS).

12. The network device according to claim 10 , wherein the mapping resource indication information comprises identifiers of the at least two terminal devices and a quantity of bits of to-be-sent HARQ information of each terminal device of the at least two terminal devices.

13. The network device according to claim 10 , wherein the mapping resource indication information comprises information about a start location of a subcarrier allocated to each terminal device of the at least two terminal devices and a quantity of bits of to-be-sent HARQ information of each terminal device of the at least two terminal devices.

14. The network device according to claim 10 , wherein the mapping resource indication information comprises identifiers of the at least two terminal devices, information about a quantity of the at least two terminal devices, and a quantity of bits of a to-be-sent HARQ signal of each terminal device of the at least two terminal devices.