Techniques and apparatuses for bandwidth part management
Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a limit on a number of concurrently active bandwidth parts, wherein the limit applies per component carrier used by the UE or across component carriers used by the UE. The UE may communicate using one or more bandwidth parts on one or more component carriers used by the UE based at least in part on the limit, wherein at least one bandwidth part of the one or more bandwidth parts is less than a full bandwidth that the UE is capable of using. Numerous other aspects are provided.
1. A method of wireless communication, comprising:
determining, by a user equipment (UE), a limit on a number of concurrently active bandwidth parts, wherein the limit applies per component carrier used by the UE; and
communicating, by the UE, using one or more bandwidth parts on one or more component carriers used by the UE based at least in part on the limit, wherein at least one bandwidth part of the one or more bandwidth parts is less than a full bandwidth that the UE is capable of using.
2. The method of claim 1 , wherein the limit is a single bandwidth part.
3. The method of claim 1 , wherein the limit includes a first number of bandwidth parts permitted to be concurrently active per component carrier used by the UE and a second number of bandwidth parts permitted to be concurrently active across component carriers used by the UE.
4. The method of claim 1 , wherein the one or more bandwidth parts are configured on a subset of slots or symbols.
5. The method of claim 4 , wherein the one or more bandwidth parts are monitored on the subset of slots or symbols, and are not monitored on other slots or symbols.
6. The method of claim 4 , wherein a search space to be monitored by the UE is restricted for the subset of slots or symbols.
7. The method of claim 1 , wherein the one or more bandwidth parts are configured for at least one of downlink communications or uplink communications.
8. The method of claim 1 , further comprising receiving an indication of one or more numerologies corresponding to the one or more bandwidth parts.
9. The method of claim 8 , wherein the indication is received in at least one of:
radio resource control (RRC) signaling,
downlink control information (DCI),
a media access control (MAC) control element (CE),
a grant, or
some combination thereof.
10. The method of claim 1 , wherein a bandwidth part, of the one or more bandwidth parts, is configured based at least in part on a numerology indicated for the bandwidth part.
11. The method of claim 1 , wherein at least two different bandwidth parts, of the one or more bandwidth parts, are associated with different numerologies.
12. The method of claim 1 , wherein one or more requested bandwidth part parameters are indicated to a base station.
13. The method of claim 12 , wherein the one or more requested bandwidth part parameters include at least one of:
a requested bandwidth for a bandwidth part of the one or more bandwidth parts,
a requested number of bandwidth parts per component carrier or across component carriers,
a requested numerology for a bandwidth part of the one or more bandwidth parts, or
some combination thereof.
14. The method of claim 1 , wherein the one or more bandwidth parts are configured based at least in part on an indication from a base station, and the UE transmits an acknowledgement (ACK) or a negative acknowledgement (NACK) based at least in part on receiving the indication.
15. The method of claim 14 , wherein:
when the indication is received via a downlink data channel, the ACK or the NACK is transmitted via a hybrid automatic repeat request (HARQ) response, or
when the indication is not received via a downlink data channel, the ACK or the NACK is transmitted as an explicit response to the indication.
16. The method of claim 14 , wherein the indication is at least one of an activation or a deactivation of at least one of the one or more bandwidth parts.
17. The method of claim 1 , further comprising transitioning from a first bandwidth part configuration to a second bandwidth part configuration on one or more component carriers being used by the UE.
18. The method of claim 17 , wherein one of the first bandwidth part configuration or the second bandwidth part configuration is a full bandwidth configuration.
19. The method of claim 17 , wherein the second bandwidth part configuration is a full bandwidth configuration, and wherein the transition is performed based at least in part on a rule, wherein the rule indicates at least one of:
a component carrier, of a plurality of component carriers being used by the UE, that is to be transitioned to the full bandwidth configuration before any other component carriers of the plurality of component carriers,
an order in which two or more of the plurality of component carriers are to be transitioned to the full bandwidth configuration,
a group of component carriers, of the plurality of component carriers, that are to be transitioned to the full bandwidth configuration together, or
some combination thereof.
20. The method of claim 17 , further comprising determining a numerology corresponding to the second bandwidth part configuration and configuring the second bandwidth part configuration based at least in part on the numerology.
21. The method of claim 17 , wherein a numerology, corresponding to the second bandwidth part configuration, is signaled in association with scheduling on a data channel or a control channel.
22. The method of claim 17 , wherein a first numerology corresponding to the first bandwidth part configuration is different from a second numerology corresponding to the second bandwidth part configuration.
23. The method of claim 17 , wherein the second bandwidth part configuration is periodically or temporarily configured on at least one component carrier, of a plurality of component carriers being used by the UE, prior to transitioning from the first bandwidth part configuration to the second bandwidth part configuration on the one or more component carriers.
24. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
determine a limit on a number of concurrently active bandwidth parts, wherein the limit applies per component carrier used by the UE; and
communicate using one or more bandwidth parts on one or more component carriers used by the UE based at least in part on the limit, wherein at least one bandwidth part of the one or more bandwidth parts is less than a full bandwidth that the UE is capable of using.
25. The UE of claim 24 , wherein the limit is a single bandwidth part.
26. The UE of claim 24 , wherein the limit includes a first number of bandwidth parts permitted to be concurrently active per component carrier used by the UE and a second number of bandwidth parts permitted to be concurrently active across component carriers used by the UE.
27. The UE of claim 24 , wherein the one or more bandwidth parts are configured on a subset of slots or symbols.
28. The UE of claim 27 , wherein the one or more bandwidth parts are monitored on the subset of slots or symbols, and are not monitored on other slots or symbols.
29. The UE of claim 27 , wherein a search space to be monitored by the UE is restricted for the subset of slots or symbols.
30. The UE of claim 24 , wherein the one or more bandwidth parts are configured for at least one of downlink communications or uplink communications.
31. The UE of claim 24 , wherein the UE is configured to receive an indication of one or more numerologies corresponding to the one or more bandwidth parts.
32. The UE of claim 31 , wherein the indication is received in at least one of:
radio resource control (RRC) signaling,
downlink control information (DCI),
a media access control (MAC) control element (CE),
a grant, or
some combination thereof.
33. The UE of claim 24 , wherein a bandwidth part, of the one or more bandwidth parts, is configured based at least in part on a numerology indicated for the bandwidth part.
34. The UE of claim 24 , wherein at least two different bandwidth parts, of the one or more bandwidth parts, are associated with different numerologies.
35. The UE of claim 24 , wherein one or more requested bandwidth part parameters are indicated to a base station.
36. The UE of claim 35 , wherein the one or more requested bandwidth part parameters include at least one of:
a requested bandwidth for a bandwidth part of the one or more bandwidth parts,
a requested number of bandwidth parts per component carrier or across component carriers,
a requested numerology for a bandwidth part of the one or more bandwidth parts, or
some combination thereof.
37. The UE of claim 24 , wherein the one or more bandwidth parts are configured based at least in part on an indication from a base station, and the UE transmits an acknowledgement (ACK) or a negative acknowledgement (NACK) based at least in part on receiving the indication.
38. The UE of claim 37 , wherein:
when the indication is received via a downlink data channel, the ACK or the NACK is transmitted via a hybrid automatic repeat request (HARQ) response, or
when the indication is not received via a downlink data channel, the ACK or the NACK is transmitted as an explicit response to the indication.
39. The UE of claim 37 , wherein the indication is at least one of an activation or a deactivation of at least one of the one or more bandwidth parts.
40. The UE of claim 24 , wherein the UE is configured to transition from a first bandwidth part configuration to a second bandwidth part configuration on one or more component carriers being used by the UE.
41. The UE of claim 40 , wherein one of the first bandwidth part configuration or the second bandwidth part configuration is a full bandwidth configuration.
42. The UE of claim 40 , wherein the second bandwidth part configuration is a full bandwidth configuration, and wherein the transition is performed based at least in part on a rule, wherein the rule indicates at least one of:
a component carrier, of a plurality of component carriers being used by the UE, that is to be transitioned to the full bandwidth configuration before any other component carriers of the plurality of component carriers,
an order in which two or more of the plurality of component carriers are to be transitioned to the full bandwidth configuration,
a group of component carriers, of the plurality of component carriers, that are to be transitioned to the full bandwidth configuration together, or
some combination thereof.
43. The UE of claim 40 , wherein the UE is configured to determine a numerology corresponding to the second bandwidth part configuration and configure the second bandwidth part configuration based at least in part on the numerology.
44. The UE of claim 40 , wherein a numerology, corresponding to the second bandwidth part configuration, is signaled in association with scheduling on a data channel or a control channel.
45. The UE of claim 40 , wherein a first numerology corresponding to the first bandwidth part configuration is different from a second numerology corresponding to the second bandwidth part configuration.
46. The UE of claim 40 , wherein the second bandwidth part configuration is periodically or temporarily configured on at least one component carrier, of a plurality of component carriers being used by the UE, prior to transitioning from the first bandwidth part configuration to the second bandwidth part configuration on the one or more component carriers.
47. A non-transitory computer-readable medium storing instructions for wireless communication, the instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:
determine a limit on a number of concurrently active bandwidth parts, wherein the limit applies per component carrier used by the UE; and
communicate using one or more bandwidth parts on one or more component carriers used by the UE based at least in part on the limit, wherein at least one bandwidth part of the one or more bandwidth parts is less than a full bandwidth that the UE is capable of using.
48. The non-transitory computer-readable medium of claim 47 , wherein at least two different bandwidth parts, of the one or more bandwidth parts, are associated with different numerologies.
49. An apparatus for wireless communication, comprising:
means for determining a limit on a number of concurrently active bandwidth parts, wherein the limit applies per component carrier used by the apparatus; and
means for communicating using one or more bandwidth parts on one or more component carriers used by the apparatus based at least in part on the limit, wherein at least one bandwidth part of the one or more bandwidth parts is less than a full bandwidth that the apparatus is capable of using.
50. The apparatus of claim 49 , wherein at least two different bandwidth parts, of the one or more bandwidth parts, are associated with different numerologies.