Communication method and communications apparatus

1. A communication method, wherein the method comprises:

determining, by a first device, a phase tracking reference signal (PTRS) pattern based on a scheduled bandwidth, wherein the PTRS pattern comprises one or more PTRS chunks, and each PTRS chunk of the one or more PTRS chunks comprises one or more PTRS samples;

mapping, by the first device, a PTRS to one or more symbols based on the PTRS pattern; and

sending the one or more symbols to a second device;

wherein the quantity of PTRS samples in one PTRS chunk of the one or more PTRS chunks is 2 or 4.

2. The method according to claim 1 , wherein the quantity of PTRS chunks in the PTRS pattern is 2 or 4.

3. The method according to claim 1 , wherein determining the PTRS pattern further comprises:

determining, by the first device, an intra-symbol PTRS chunk density and a quantity of PTRS samples per PTRS chunk based on a correspondence between: (1) the scheduled bandwidth; and (2) the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk; and

determining, by the first device, the PTRS pattern based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk.

4. The method according to claim 3 , wherein determining the PTRS pattern based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk further comprises:

determining, by the first device, distribution locations of PTRS chunks within a symbol based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk; and

determining, by the first device, the PTRS pattern based on the intra-symbol PTRS chunk density, the quantity of PTRS samples per PTRS chunk, and the distribution locations of the PTRS chunks within the symbol.

5. The method according to claim 4 , wherein the intra-symbol PTRS chunk density being 2 corresponds to two PTRS chunks being distributed at two ends of the symbol.

6. The method according to claim 3 , wherein the method further comprises: receiving, from the second device, indication information; and

wherein determining the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk is based on the received indication information.

7. The method according to claim 1 , wherein single-carrier modulation is used with respect to the one or more symbols.

8. The method according to claim 1 , wherein the one or more symbols are one or more discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) symbols.

9. The method according to claim 1 , wherein the method further comprises:

determining, by the first device, that the scheduled bandwidth is greater than or equal to a scheduled bandwidth threshold.

10. The method according to claim 9 , wherein the method further comprises:

determining, by the first device, the scheduled bandwidth threshold based on at least one of: a phase noise level, a subcarrier spacing, or a frequency.

11. A communications apparatus, comprising:

one or more memories configured to store instructions; and

one or more processors coupled to the one or more memories and configured to execute the instructions to cause the apparatus to:

determine a phase tracking reference signal (PTRS) pattern based on a scheduled bandwidth, wherein the PTRS pattern comprises one or more PTRS chunks, and each PTRS chunk of the one or more PTRS chunks comprises one or more PTRS samples;

map a PTRS to one or more symbols based on the PTRS pattern; and

send the one or more symbols;

wherein the quantity of PTRS samples in one PTRS chunk of the one or more PTRS chunks is 2 or 4.

12. The apparatus according to claim 11 , wherein the quantity of PTRS chunks in the PTRS pattern is 2 or 4.

13. The apparatus according to claim 11 , wherein determining the PTRS pattern further comprises:

determining an intra-symbol PTRS chunk density and a quantity of PTRS samples per PTRS chunk based on a correspondence between: (1) the scheduled bandwidth; and (2) the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk; and

determining the PTRS pattern based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk.

14. The apparatus according to claim 13 , wherein determining the PTRS pattern based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk further comprises:

determining distribution locations of PTRS chunks within a symbol based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk; and

determining the PTRS pattern based on the intra-symbol PTRS chunk density, the quantity of PTRS samples per PTRS chunk, and the distribution locations of the PTRS chunks within the symbol.

15. The apparatus according to claim 14 , wherein the intra-symbol PTRS chunk density being 2 corresponds to two PTRS chunks being distributed at two ends of the symbol.

16. The apparatus according to claim 13 , wherein the one or more processors are further configured to execute the instructions to cause the apparatus to: receive indication information:

wherein determining the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk is based on the received indication information.

17. The apparatus according to claim 11 , wherein the one or more symbols are one or more discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) symbols.

18. The apparatus according to claim 11 , wherein the one or more processors are further configured to execute the instructions to cause the apparatus to:

determine that the scheduled bandwidth is greater than or equal to a scheduled bandwidth threshold.

19. The apparatus according to claim 18 , wherein the one or more processors are further configured to execute the instructions to cause the apparatus to:

determine the scheduled bandwidth threshold based on at least one of: a phase noise level, a subcarrier spacing, or a frequency.

20. A communication method, wherein the method comprises:

receiving, by a device, one or more symbols; and

determining, by the device, a phase tracking reference signal (PTRS) pattern from the one or more symbols based on a scheduled bandwidth;

wherein the PTRS pattern comprises one or more PTRS chunks, and each PTRS chunk of the one or more PTRS chunks comprises one or more PTRS samples;

wherein the quantity of PTRS samples in one PTRS chunk of the one or more PTRS chunks is 2 or 4.

21. The method according to claim 20 , wherein the quantity of PTRS chunks in the PTRS pattern is 2 or 4.

22. The method according to claim 20 , wherein determining the PTRS pattern further comprises:

determining an intra-symbol PTRS chunk density and a quantity of PTRS samples per PTRS chunk based on a correspondence between: (1) the scheduled bandwidth; and (2) the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk; and

determining the PTRS pattern based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk.

23. The method according to claim 22 , wherein determining the PTRS pattern based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk further comprises:

determining distribution locations of PTRS chunks within a symbol based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk; and

determining the PTRS pattern based on the intra-symbol PTRS chunk density, the quantity of PTRS samples per PTRS chunk, and the distribution locations of the PTRS chunks within the symbol.

24. The method according to claim 23 , wherein the intra-symbol PTRS chunk density being 2 corresponds to two PTRS chunks being distributed at two ends of the symbol.

25. The method according to claim 20 , wherein single-carrier modulation is used with respect to the one or more symbols.

26. The method according to claim 20 , wherein the one or more symbols are one or more discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) symbols.

27. A communications apparatus, comprising:

one or more memories configured to store instructions; and

one or more processors coupled to the one or more memories and configured to execute the instructions to facilitate the following being performed by the apparatus:

receiving one or more symbols; and

determining a phase tracking reference signal (PTRS) pattern from the one or more symbols based on a scheduled bandwidth;

wherein the PTRS pattern comprises one or more PTRS chunks, and each PTRS chunk of the one or more PTRS chunks comprises one or more PTRS samples;

wherein the quantity of PTRS samples in one PTRS chunk of the one or more PTRS chunks is 2 or 4.

28. The apparatus according to claim 27 , wherein the quantity of PTRS chunks in the PTRS pattern is 2 or 4.

29. The apparatus according to claim 27 , wherein determining the PTRS pattern further comprises:

determining an intra-symbol PTRS chunk density and a quantity of PTRS samples per PTRS chunk based on a correspondence between: (1) the scheduled bandwidth; and (2) the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk; and

determining the PTRS pattern based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk.

30. The apparatus according to claim 29 , wherein determining the PTRS pattern based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk further comprises:

determining distribution locations of PTRS chunks within a symbol based on the intra-symbol PTRS chunk density and the quantity of PTRS samples per PTRS chunk; and

determining the PTRS pattern based on the intra-symbol PTRS chunk density, the quantity of PTRS samples per PTRS chunk, and the distribution locations of the PTRS chunks within the symbol.

31. The apparatus according to claim 30 , wherein the intra-symbol PTRS chunk density being 2 corresponds to two PTRS chunks being distributed at two ends of the symbol.

32. The apparatus according to claim 27 , wherein single-carrier modulation is used with respect to the one or more symbols.

33. The apparatus according to claim 27 , wherein the one or more symbols are one or more discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) symbols.