Information indication method, terminal device, and network device

1. An information indication method, performed by a first terminal device, comprising:

receiving transmission feature parameter from a network device, wherein the transmission feature parameter is used to send a physical channel by the first terminal device to a second terminal device on a sidelink (SL), and the transmission feature parameter comprises demodulation reference signal (DMRS) configuration parameter, wherein the DMRS configuration parameter includes a time-domain configuration parameter and a frequency-domain configuration parameter, wherein the time-domain configuration parameter includes at least one of a quantity of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the DMRS or a time-domain location parameter of the DMRS, wherein the frequency-domain configuration parameter includes at least one of a quantity of subcarriers of the DMRS or a frequency-domain location parameter of the DMRS; and

sending the transmission feature information to the second terminal device for the second terminal device to demodulate the physical channel.

2. The information indication method according to claim 1 , wherein the transmission feature parameter is used to send a physical sidelink shared channel (PSSCH) on the SL; and

the sending the transmission feature information to the second terminal device comprises:

sending a physical sidelink control channel (PSCCH) to the second terminal device, wherein the PSCCH carries the transmission feature parameter.

3. The information indication method according to claim 1 , wherein

the transmission feature information comprises at least one of a subcarrier spacing (SCS), a cyclic prefix (CP), or a bandwidth part (BWP), and at least one of the SCS, the CP, or the BWP has a first mapping relationship with the DMRS configuration parameter to enable the second terminal device to determine the DMRS configuration parameter from the at least one of the SCS, the CP, or the BWP;

or,

the transmission feature parameter further comprises at least one of the SCS, the CP, or the BWP, the transmission feature information comprises the DMRS configuration parameter, and the at least one of the SCS, the CP, or the BWP has a second mapping relationship with the DMRS configuration parameter to enable the second terminal device to determine the at least one of the SCS, the CP, or the BWP from the DMRS configuration parameter;

or,

the transmission feature information comprises a synchronization signal, and a sequence value of the synchronization signal has a third mapping relationship with the transmission feature parameter to enable the second terminal device to determine the transmission feature parameter from the synchronization signal;

or,

the transmission feature information comprises broadcast information and a synchronization signal, and a time-domain transmit location and frequency-domain transmit location relationship between the broadcast information and the synchronization signal has a fourth mapping relationship with the transmission feature parameter to enable the second terminal device to determine the transmission feature parameter from the time-domain transmit location and frequency-domain transmit location relationship.

4. The information indication method according to claim 1 , wherein the sending the transmission feature information to a second terminal device comprises:

sending broadcast information to the second terminal device, wherein at least one of an SCS, a CP, a BWP, or the DMRS configuration parameter that is used by the first terminal device for sending the broadcast information has a fifth mapping relationship with the transmission feature parameter to enable the second terminal device to determine the transmission feature parameter from the at least one of the SCS, the CP, the BWP, or the DMRS configuration parameter.

5. The information indication method according to claim 1 , wherein

the transmission feature information comprises a synchronization signal, and at least one of an SCS, a CP, a BWP, or the DMRS configuration parameter that is used by the first terminal device for sending the synchronization signal has a sixth mapping relationship with the transmission feature parameter to enable the second terminal device to determine the transmission feature parameter from the at least one of the SCS, the CP, the BWP, or the DMRS configuration parameter.

6. The information indication method according to claim 1 , wherein after the sending the transmission feature information to a second terminal device, the method further comprising:

updating the transmission feature parameter; and

sending updated transmission feature information based on a specified time period, wherein the updated transmission feature information is used to indicate the updated transmission feature parameter.

7. The information indication method according to claim 1 , wherein after the sending the transmission feature information to a second terminal device, the method further comprising:

updating the transmission feature parameter based on a reference factor, wherein the reference factor comprises at least one of a moving characteristic or a service characteristic; and

sending updated transmission feature information, wherein the updated transmission feature information is used to indicate the updated transmission feature parameter.

8. An information indication method for information received from a first terminal device, performed by a second terminal device, comprising:

receiving transmission feature information, wherein the transmission feature information is used to indicate a transmission feature parameter, and the transmission feature parameter comprises demodulation reference signal (DMRS) configuration parameter; and

determining the transmission feature parameter based on the transmission feature information, wherein the transmission feature parameter is used to demodulate a physical channel that is sent by the first terminal device to the second terminal device on a sidelink (SL), wherein the DMRS configuration parameter includes a time-domain configuration parameter and a frequency-domain configuration parameter, wherein the time-domain configuration parameter includes at least one of a quantity of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the DMRS or a time-domain location parameter of the DMRS, wherein the frequency-domain configuration parameter includes at least one of a quantity of subcarriers of the DMRS or a frequency-domain location parameter of the DMRS.

9. The information indication method according to claim 8 , wherein the receiving transmission feature information comprises:

receiving the transmission feature information from the first terminal device.

10. The information indication method according to claim 9 , wherein the transmission feature parameter is used to demodulate a physical sidelink shared channel (PSSCH) sent by the first terminal device; and

the determining the transmission feature parameter based on the transmission feature information comprises:

receiving a physical sidelink control channel (PSCCH) from the first terminal device, wherein the PSCCH carries the transmission feature parameter; and

determining the transmission feature parameter based on the PSCCH.

11. The information indication method according to claim 9 , wherein

the transmission feature information comprises at least one of a subcarrier spacing (SCS), a cyclic prefix (CP), or a bandwidth part (BWP), and

the determining the transmission feature parameter based on the transmission feature information comprises:

determining the transmission feature parameter based on the transmission feature information and a first mapping relationship, wherein the first mapping relationship is a mapping relationship between the DMRS configuration parameter and the at least one of the SCS, the CP, or the BWP to enable the second terminal device to determine the DMRS configuration parameter from the at least one of the SCS, the CP, or the BWP; or,

the transmission feature parameter further comprises at least one of the SCS, the CP, or the BWP, and the transmission feature information comprises the DMRS configuration parameter, and

the determining the transmission feature parameter based on the transmission feature information comprises:

determining the transmission feature parameter based on the transmission feature information and a second mapping relationship, wherein the second mapping relationship is a mapping relationship between the DMRS configuration parameter and the at least one of the SCS, the CP, or the BWP to enable the second terminal device to determine the at least one of the SCS, the CP, or the BWP from the DMRS configuration parameter; or,

the transmission feature information comprises a synchronization signal, and

the determining the transmission feature parameter based on the transmission feature information comprises:

determining the transmission feature parameter based on the transmission feature information and a third mapping relationship, wherein the third mapping relationship is a mapping relationship between a sequence value of the synchronization signal and the transmission feature parameter to enable the second terminal device to determine the transmission feature parameter from the synchronization signal; or,

the transmission feature information comprises broadcast information and a synchronization signal, and

the determining the transmission feature parameter based on the transmission feature information comprises:

determining the transmission feature parameter based on the transmission feature information and a fourth mapping relationship, wherein the fourth mapping relationship is a mapping relationship between the transmission feature parameter and a time-domain transmit location and frequency-domain transmit location relationship between the broadcast information and the synchronization signal to enable the second terminal device to determine the transmission feature parameter from the time-domain transmit location and frequency-domain transmit location relationship.

12. The information indication method according to claim 9 , wherein broadcast information is received from the first terminal device; and

the determining the transmission feature parameter based on the transmission feature information comprises:

determining the transmission feature parameter based on the broadcast information and a fifth mapping relationship, wherein the fifth mapping relationship is a mapping relationship between the transmission feature parameter, and at least one of an SCS, a CP, a BWP, or the DMRS configuration parameter that is used by the first terminal device for sending the broadcast information to enable the second terminal device to determine the transmission feature parameter from the at least one of the SCS, the CP, the BWP, or the DMRS configuration parameter.

13. The information indication method according to claim 9 , wherein the transmission feature information comprises a synchronization signal; and

the determining the transmission feature parameter based on the transmission feature information comprises:

determining the transmission feature parameter based on the transmission feature information and a sixth mapping relationship, wherein the sixth mapping relationship is a mapping relationship between the transmission feature parameter, and at least one of an SCS, a CP, a BWP, or the DMRS configuration parameter that is used by the first terminal device for sending the synchronization signal to enable the second terminal device to determine the transmission feature parameter from the at least one of the SCS, the CP, the BWP, or the DMRS configuration parameter.

14. The information indication method according to claim 9 , wherein the receiving the transmission feature information from the first terminal device comprises:

receiving updated transmission feature information from the first terminal device based on a specified time period, wherein the updated transmission feature information is used to indicate an updated transmission feature parameter, and the updated transmission feature parameter is obtained by the first terminal device by updating the transmission feature parameter.

15. A first terminal device, comprising:

a processor configured to:

receive transmission feature parameter from a network device, wherein the transmission feature parameter is used to send a physical channel by the first terminal device to a second terminal device on a sidelink (SL), and the transmission feature parameter comprises demodulation reference signal (DMRS) configuration parameter, wherein the DMRS configuration parameter includes a time-domain configuration parameter and a frequency-domain configuration parameter, wherein the time-domain configuration parameter includes at least one of a quantity of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the DMRS or a time-domain location parameter of the DMRS, wherein the frequency-domain configuration parameter includes at least one of a quantity of subcarriers of the DMRS or a frequency-domain location parameter of the DMRS; and

send the transmission feature information to the second terminal device for the second terminal device to demodulate the physical channel.

16. The first terminal device according to claim 15 , wherein the transmission feature parameter is used to send a physical sidelink shared channel (PSSCH) on the SL; and

the send the transmission feature information to a second terminal device comprises:

send a physical sidelink control channel (PSCCH), wherein the PSCCH carries the transmission feature parameter.

17. The first terminal device according to claim 15 , wherein

the transmission feature information comprises at least one of a subcarrier spacing (SCS), a cyclic prefix (CP), or a bandwidth part (BWP), and at least one of the SCS, the CP, or the BWP has a first mapping relationship with the DMRS configuration parameter to enable the second terminal device to determine the DMRS configuration parameter from the at least one of the SCS, the CP, or the BWP;

or,

the transmission feature parameter further comprises at least one of the SCS, the CP, or the BWP, the transmission feature information comprises the DMRS configuration parameter, and the at least one of the SCS, the CP, or the BWP has a second mapping relationship with the DMRS configuration parameter to enable the second terminal device to determine the at least one of the SCS, the CP, or the BWP from the DMRS configuration parameter;

or,

the transmission feature information comprises a synchronization signal, and a sequence value of the synchronization signal has a third mapping relationship with the transmission feature parameter to enable the second terminal device to determine the transmission feature parameter from the synchronization signal;

or,

the transmission feature information comprises broadcast information and a synchronization signal, and a time-domain transmit location and frequency-domain transmit location relationship between the broadcast information and the synchronization signal has a fourth mapping relationship with the transmission feature parameter to enable the second terminal device to determine the transmission feature parameter from the time-domain transmit location and frequency-domain transmit location relationship.

18. The first terminal device according to claim 15 , wherein the processor further be configured to:

send broadcast information to the second terminal device, wherein at least one of an SCS, a CP, a BWP, or the DMRS configuration parameter that is used by the first terminal device for sending the broadcast information has a fifth mapping relationship with the transmission feature parameter to enable the second terminal device to determine the transmission feature parameter from the at least one of the SCS, the CP, the BWP, or the DMRS configuration parameter.

19. The first terminal device according to claim 15 , wherein

the transmission feature information comprises a synchronization signal, and at least one of an SCS, a CP, a BWP, or the DMRS configuration parameter that is used by the first terminal device for sending the synchronization signal has a sixth mapping relationship with the transmission feature parameter to enable the second terminal device to determine the transmission feature parameter from the at least one of the SCS, the CP, the BWP, or the DMRS configuration parameter.

20. The first terminal device according to claim 15 , wherein the processor further be configured to:

update the transmission feature parameter; and

send updated transmission feature information based on a specified time period, wherein the updated transmission feature information is used to indicate the updated transmission feature parameter.