Information indication method and apparatus

1. A method, comprising:

receiving, by a terminal-side device, first higher layer signaling from a network-side device, wherein the first higher layer signaling configures N bandwidth parts (BWPs) for the terminal-side device, and N is a positive integer; and

receiving, by the terminal-side device, downlink control information from the network-side device; and

determining, by the terminal-side device, an active BWP to use for communication based on the downlink control information, wherein when N is less than a maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in a connected mode, the downlink control information indicates a position of the active BWP in a group comprising an initial BWP used by the terminal-side device and the N BWPs.

2. The method according to claim 1 , wherein a position of the initial BWP is before positions of the N BWPs.

3. The method according to claim 1 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the method further comprises:

receiving, by the terminal-side device, second higher layer signaling from the network-side device, wherein the second higher layer signaling indicates to add M BWPs to BWPs configured for the terminal-side device, and M is a positive integer; and

when N+M is less than the maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in the connected mode, establishing, by the terminal-side device based on a positional sequence, a correspondence between BWPs of a group of BWPs including the initial BWP, the M BWPs, and the N BWPs, and candidate bit states of one or more bits comprised in the indication field.

4. The method according to claim 1 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the method further comprises:

receiving, by the terminal-side device, third higher layer signaling from the network-side device, wherein the third higher layer signaling indicates to delete P BWPs from configured BWPs of the terminal-side device, and P is a positive integer less than N; and

establishing, by the terminal-side device based on a positional sequence, a correspondence between candidate bit states of one or more bits comprised in the indication field and remaining BWPs of configured BWPs of the terminal-side device after the P BWPs are deleted.

5. The method according to claim 1 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the method further comprises:

receiving, by the terminal-side device, second higher layer signaling from the network-side device, wherein the second higher layer signaling indicates to add M BWPs to BWPs configured for the terminal-side device, and M is a positive integer; and

when N+M is less than the maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in the connected mode, establishing, by the terminal-side device based on BWP identifiers, a correspondence between BWPs of a group of BWPs including the initial BWP, the M BWPs, the N BWPs, and candidate bit states of one or more bits comprised in the indication field.

6. The method according to claim 1 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the method further comprises:

receiving, by the terminal-side device, third higher layer signaling from the network-side device, wherein the third higher layer signaling indicates to delete P BWPs from BWPs configured for the terminal-side device, and P is a positive integer less than N; and

establishing, by the terminal-side device based on BWP identifiers, a correspondence between candidate bit states of one or more bit comprised in the indication field and remaining BWPs of configured BWPs of the terminal-side device after the P BWPs are deleted.

7. A method, comprising:

sending, by a network-side device, first higher layer signaling to a terminal-side device, wherein the first higher layer signaling configures N bandwidth parts (BWPs) for the terminal-side device, and N is a positive integer; and

sending, by the network-side device, downlink control information to the terminal-side device, wherein when N is less than a maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in a connected mode, the downlink control information indicates a position of an active BWP in a group comprising an initial BWP used by the terminal-side device and the N BWPs.

8. The method according to claim 7 , wherein a position of the initial BWP is before positions of the N BWPs.

9. The method according to claim 7 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the method further comprises:

adding, by the network-side device, M BWPs to BWPs configured for the terminal-side device, wherein M is a positive integer; and

when N+M is less than the maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in the connected mode, establishing, by the network-side device based on a positional sequence, a correspondence between BWPs of a group comprising the initial BWP, the M BWPs, and the N BWPs, and candidate bit states of one or more bits comprised in the indication field.

10. The method according to claim 9 , wherein adding, by the network-side device, the M BWPs to BWPs configured for the terminal-side device comprises:

sending, by the network-side device, second higher layer signaling to the terminal-side device, wherein the second higher layer signaling indicates to add the M BWPs to BWPs configured for the terminal-side device.

11. The method according to claim 7 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the method further comprises:

deleting, by the network-side device, P BWPs from BWPs configured for the terminal-side device, wherein P is a positive integer less than N; and

establishing, by the network-side device based on a positional sequence, a correspondence between candidate bit states of one or more bits comprised in the indication field and remaining BWPs obtained after the P BWPs are deleted.

12. The method according to claim 7 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the method further comprises:

adding, by the network-side device, M BWPs to BWPs configured for the terminal-side device, wherein M is a positive integer; and

when N+M is less than the maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in the connected mode, establishing, by the network-side device based on BWP identifiers, a correspondence between BWPs of a group comprising the initial BWP, the M BWPs, and the N BWPs, and candidate bit states of one or more bits comprised in the indication field.

13. The method according to claim 7 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the method further comprises:

deleting, by the network-side device, P BWPs from BWPs configured for the terminal-side device, wherein P is a positive integer less than N; and

establishing, by the network-side device based on BWP identifiers, a correspondence between candidate bit states of one or more bits comprised in the indication field and remaining BWPs obtained after the P BWPs are deleted.

14. The method according to claim 13 , wherein deleting, by the network-side device, the P BWPs from BWPs configured for the terminal-side device comprises:

sending, by the network-side device, third higher layer signaling to the terminal-side device, wherein the third higher layer signaling indicates to delete the P BWPs.

15. A terminal-side device, comprising:

at least one processor and at least one non-transitory memory storing instructions;

wherein the instructions are executable by the at least one processor to cause the terminal-side device to:

receive first higher layer signaling from a network-side device, wherein the first higher layer signaling configures N bandwidth parts (BWPs) for the terminal-side device, and N is a positive integer;

receive downlink control information from the network-side device; and

determine an active BWP to use to communicate based on the downlink control information, wherein when N is less than a maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in a connected mode, the downlink control information indicates a position of the active BWP in a group comprising an initial BWP used by the terminal-side device and the N BWPs.

16. The terminal-side device according to claim 15 , wherein a position of the initial BWP is before positions of the N BWPs or after positions of the N BWPs.

17. The terminal-side device according to claim 15 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the instructions are executable by the at least one processor to further cause the terminal-side device to:

receive second higher layer signaling from the network-side device, wherein the second higher layer signaling indicates to add M BWPs to configured BWPs of the terminal-side device, and M is a positive integer; and

when N+M is less than the maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in the connected mode, establish, based on a positional sequence, a correspondence between BWPs of a group comprising the initial BWP, the M BWPs, and the N BWPs, and candidate bit states of one or more bits comprised in the indication field.

18. The terminal-side device according to claim 15 , wherein the downlink control information indicates the position of the active BWP using an indication field; and the instructions are executable by the at least one processor to further cause the terminal-side device to:

receive third higher layer signaling from the network-side device, wherein the third higher layer signaling indicates to delete P BWPs from BWPs configured for the terminal-side device, and P is a positive integer less than N; and

establish, based on a positional sequence, a correspondence between candidate bit states of one or more bits comprised in the indication field and remaining BWPs obtained after the P BWPs are deleted.

19. The terminal-side device according to claim 15 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the instructions are executable by the at least one processor to further cause the terminal-side device to:

receive second higher layer signaling from the network-side device, wherein the second higher layer signaling indicates to add M BWPs to BWPs configured for the terminal-side device, and M is a positive integer; and

when N+M is less than the maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in the connected mode, establish, based on BWP identifiers, a correspondence between BWPs of a group comprising the initial BWP, the M BWPs, and the N BWPs, and candidate bit states of one or more bits comprised in the indication field.

20. The terminal-side device according to claim 15 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the instructions are executable by the at least one processor to further cause the terminal-side device to:

receive third higher layer signaling from the network-side device, wherein the third higher layer signaling indicates to delete P BWPs from BWPs configured for the terminal-side device, and P is a positive integer less than N; and

establish, based on BWP identifiers, a correspondence between candidate bit states of one or more bits comprised in the indication field and remaining BWPs obtained after the P BWPs are deleted.

21. A network-side device, comprising:

at least one processor; and

at least one non-transitory memory storing instructions, wherein the instructions are executable by the at least one processor to cause the network-side device to:

send first higher layer signaling to a terminal-side device, wherein the first higher layer signaling configures N bandwidth parts (BWPs) for the terminal-side device, and N is a positive integer; and

send downlink control information to the terminal-side device, wherein when N is less than a maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in a connected mode, the downlink control information indicates a position of an active BWP in a group comprising an initial BWP and the N BWPs.

22. The network-side device according to claim 21 , wherein a position of the initial BWP is before positions of the N BWPs or after positions of the N BWPs.

23. The network-side device according to claim 21 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the instructions are executable by the at least one processor to further cause the network-side device to:

add M BWPs to BWPS configured BWPs of the terminal-side device, wherein M is a positive integer; and

when N+M is less than the maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in the connected mode, establish, based on a positional sequence, a correspondence between BWPS of a group comprising the initial BWP, the M BWPs, and the N BWPs, and candidate bit states of one or more bits comprised in the indication field.

24. The network-side device according to claim 21 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the instructions are executable by the at least one processor to further cause the network-side device to:

delete P BWPs from configured BWPs of the terminal-side device, wherein P is a positive integer less than N; and

establish, based on a positional sequence, a correspondence between candidate bit states of one or more bits comprised in the indication field and remaining BWPs obtained after the P BWPs are deleted.

25. The network-side device according to claim 21 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the instructions are executable by the at least one processor to further cause the network-side device to:

add M BWPs to configured BWPs of the terminal-side device, wherein M is a positive integer; and

when N+M is less than the maximum quantity of BWPs that are configurable through the first higher layer signaling when the terminal-side device is in the connected mode, establish, based on BWP identifiers, a correspondence between BWPs of a group comprising the initial BWP, the M BWPs, and the N BWPs, and candidate bit states of one or more bits comprised in the indication field.

26. The network-side device according to claim 25 , wherein the instructions are executable by the at least one processor to cause the network-side device to:

send second higher layer signaling to the terminal-side device, wherein the second higher layer signaling indicates to add the M BWPs.

27. The network-side device according to claim 21 , wherein the downlink control information indicates the position of the active BWP using an indication field, and the instructions are executable by the at least one processor to further cause the network-side device to

delete P BWPs from configured BWPs of the terminal-side device, wherein P is a positive integer less than N; and

establish, based on BWP identifiers, a correspondence between candidate bit states of one or more bits comprised in the indication field and remaining BWPs obtained after the P BWPs are deleted.

28. The network-side device according to claim 27 , wherein the instructions are executed by the at least one processor to cause the network-side device to

send third higher layer signaling to the terminal-side device, wherein the third higher layer signaling indicates to delete the P BWPs.