Timing advance determining method and device

1. A method, comprising:

receiving, by a terminal, first timing advance (TA) information sent by a network device;

determining, by the terminal based on a correspondence between a first parameter set and a first TA granularity, that the first TA granularity corresponds to a frequency domain resource occupied by the terminal, wherein the first parameter set comprises a first subcarrier spacing (SCS) and a first cyclic prefix (CP) type, wherein the first TA granularity corresponding to the first parameter set is non-inversely proportional to the subcarrier spacing when the CP type is not a normal cyclic prefix (NCP); and

determining, by the terminal based on the first TA granularity and the first TA information, a TA value used by the terminal on the occupied frequency domain resource;

wherein:

a maximum timing advance group (TAG) quantity is limited to 4 based on the first parameter set comprising an SCS that is 15 kHz and a CP type that is a normal CP; or

a maximum TAG quantity is limited to 8 based on the first parameter set comprising an SCS that is 30 kHz and a CP type that is a normal CP; or

a maximum TAG quantity is limited to 16 based on the first parameter set comprising an SCS that is 60 kHz; or

a maximum TAG quantity is limited to 8 or 16 based on the first parameter set comprising an SCS that is 60 kHz and a CP type that is an extended CP; or

a maximum TAG quantity is limited to 32 based on the first parameter set comprising an SCS that is 120 kHz and a CP type that is a normal CP.

2. The method according to claim 1 , further comprising:

receiving, by the terminal, timing advance group (TAG) information sent by the network device, wherein the TAG information identifies one or more TAGs, and a frequency domain resource in each TAG is a bandwidth part, a bandwidth part with space direction information, or a component carrier with space direction information.

3. The method according to claim 1 , further comprising:

receiving, by the terminal, TAG information sent by the network device, wherein the TAG information identifies one or more TAGs; and

wherein:

frequency domain resources in each TAG correspond to a single parameter set; or

a parameter set corresponding to a frequency domain resource in each TAG satisfies a preset condition.

4. The method according to claim 1 , wherein:

the first CP type is a normal CP, and the first TA granularity corresponding to the first parameter set is in inverse proportion to a CP length corresponding to the first parameter set; or

the first TA granularity corresponding to the first parameter set corresponds to a value range within which a CP length corresponding to the first parameter set falls.

5. The method according to claim 1 , wherein TA information corresponding to different parameter sets occupies a same quantity of bits, and bits occupied by the first TA information corresponding to the first parameter set comprise a reserved bit.

6. The method according to claim 1 , wherein a quantity of bits occupied by the first TA information corresponding to the first parameter set is different from a quantity of bits occupied by second TA information corresponding to a second parameter set.

7. The method according to claim 1 , wherein a maximum timing advance group (TAG) quantity corresponding to the first parameter set is different from a maximum TAG quantity corresponding to a second parameter set.

8. The method according to claim 1 , wherein the first SCS comprised in the first parameter set is 60 kHz and the first CP type comprised in the first parameter set is a normal CP, and a second parameter set comprises a second SCS that is 60 kHz and a second CP type that is an extended CP; and

wherein the first parameter set and the second parameter set have different TA granularities, quantities of bits occupied by TA information, or quantities of maximum timing advance group (TAG) quantities that respectively correspond to first parameter set and the second parameter set.

9. A network device, comprising:

a transmitter;

a processor; and

a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for:

determining, based on a correspondence between a first parameter set and a first timing advance (TA) granularity, TA information to be used by a terminal on an occupied frequency domain resource, wherein the first parameter set comprises a first subcarrier spacing (SCS) and a first cyclic prefix (CP) type, wherein the first TA granularity corresponding to the first parameter set is non-inversely proportional to the subcarrier spacing when the CP type is not a normal cyclic prefix (NCP); and

sending the TA information to the terminal using the transmitter;

wherein:

a maximum timing advance group (TAG) quantity is limited to 4 based on the first parameter set comprising an SCS that is 15 kHz and a CP type that is a normal CP; or

a maximum TAG quantity is limited to 8 based on the first parameter set comprising an SCS that is 30 kHz and a CP type that is a normal CP; or

a maximum TAG quantity is limited to 16 based on the first parameter set comprising an SCS that is 60 kHz; or

a maximum TAG quantity is limited to 8 or 16 based on the first parameter set comprising an SCS that is 60 kHz and a CP type that is an extended CP; or

a maximum TAG quantity is limited to 32 based on the first parameter set comprising an SCS that is 120 kHz and a CP type that is a normal CP.

10. The network device according to claim 9 , wherein the program further includes instructions for:

sending timing advance group (TAG) information to the terminal using the transmitter, wherein a frequency domain resource in each TAG is a bandwidth part, a bandwidth part with space direction information, or a component carrier with space direction information.

11. The network device according to claim 9 , wherein the program further includes instructions for:

sending timing advance group (TAG) information to the terminal using the transmitter;

wherein:

frequency domain resources in each TAG correspond to a single parameter set; or

a parameter set corresponding to a frequency domain resource in each TAG satisfies a preset condition.

12. A terminal device, comprising:

receiver;

a processor; and

a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for:

receiving, using the receiver, first timing advance (TA) information sent by a network device;

determining, based on a correspondence between a first parameter set and a first TA granularity, that the first TA granularity corresponds to a frequency domain resource occupied by the terminal device, wherein the first parameter set comprises a first subcarrier spacing (SCS) and a first cyclic prefix (CP) type, wherein the first TA granularity corresponding to the first parameter set is non-inversely proportional to the subcarrier spacing when the CP type is not a normal cyclic prefix (NCP); and

determining, based on the first TA granularity and the first TA information, a TA value used by the terminal device on the occupied frequency domain resource;

wherein:

a maximum timing advance group (TAG) quantity is limited to 4 based on the first parameter set comprising an SCS that is 15 kHz and a CP type that is a normal CP; or

a maximum TAG quantity is limited to 8 based on the first parameter set comprising an SCS that is 30 kHz and a CP type that is a normal CP; or

a maximum TAG quantity is limited to 16 based on the first parameter set comprising an SCS that is 60 kHz; or

a maximum TAG quantity is limited to 8 or 16 based on the first parameter set comprising an SCS that is 60 kHz and a CP type that is an extended CP; or

a maximum TAG quantity is limited to 32 based on the first parameter set comprising an SCS that is 120 kHz and a CP type that is a normal CP.

13. The terminal device according to claim 12 , wherein the program further includes instructions for:

receiving, using the receiver, timing advance group (TAG) information sent by the network device, wherein a frequency domain resource in each TAG is a bandwidth part, a bandwidth part with space direction information, or a component carrier with space direction information.

14. The terminal device according to claim 12 , wherein the program further includes instructions for:

receiving, using the receiver, timing advance group (TAG) information sent by the network device;

wherein:

frequency domain resources in each TAG correspond to a single parameter set; or

a parameter set corresponding to a frequency domain resource in each TAG satisfies a preset condition.

15. The terminal device according to claim 12 , wherein:

the first CP type is a normal CP, and the first TA granularity corresponding to the first parameter set is in inverse proportion to a CP length corresponding to the first parameter set; or

the first TA granularity corresponding to the first parameter set corresponds to a value range within which a CP length corresponding to the first parameter set falls.

16. The terminal device according to claim 12 , wherein TA information corresponding to different parameter sets occupies a same quantity of bits, and bits occupied by the first TA information corresponding to the first parameter set comprise a reserved bit.

17. The terminal device according to claim 12 , wherein a quantity of bits occupied by the first TA information corresponding to the first parameter set is different from a quantity of bits occupied by second TA information corresponding to a second parameter set.

18. The terminal device according to claim 12 , wherein different parameter sets correspond to different maximum timing advance group (TAG) quantities.