Beam selection for carrier aggregation in millimeter wave sidelinks
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a set of frequency components to use in sidelink operation based at least in part on an inter-band carrier aggregation configuration. In some aspects, the set of frequency components includes one or more frequency components in a first frequency band and one or more frequency components in a second frequency band. The UE may communicate with another UE over a sidelink using one or more beams that are selected based at least in part on channel conditions associated with the one or more frequency components in the first frequency band and channel conditions associated with the one or more frequency components in the second frequency band. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
determining a set of frequency components to use in sidelink operation based at least in part on an inter-band carrier aggregation configuration, wherein the set of frequency components includes one or more frequency components in a first frequency band and one or more frequency components in a second frequency band; and
communicating with another UE over a sidelink using one or more beams that are selected based at least in part on channel conditions associated with the one or more frequency components in the first frequency band and channel conditions associated with the one or more frequency components in the second frequency band.
2. The method of claim 1 , wherein the one or more beams include a first beam associated with a first set of beam weights and a second beam associated with a second set of beam weights based at least in part on the channel conditions associated with the one or more frequency components in the first frequency band and the channel conditions associated with the one or more frequency components in the second frequency band.
3. The method of claim 2 , wherein the first set of beam weights and the second set of beam weights are independently determined based at least in part on the UE and the other UE using different radio frequency chains to communicate over the sidelink in the first frequency band and the second frequency band.
4. The method of claim 2 , wherein the first set of beam weights and the second set of beam weights are determined to mitigate performance loss in the first frequency band and the second frequency band based at least in part on the UE and the other UE using a common radio frequency chain to communicate over the sidelink in the first frequency band and the second frequency band.
5. The method of claim 2 , wherein the first set of beam weights and the second set of beam weights are based at least in part on a first number of clusters in a channel of the first frequency band and a second number of clusters in a channel of the second frequency band.
6. The method of claim 1 , wherein the one or more beams include only a beam associated with the first frequency band based at least in part on the channel conditions associated with the one or more frequency components in the second frequency band.
7. The method of claim 6 , further comprising:
transmitting, to the other UE, a request to mute the second frequency band.
8. The method of claim 7 , further comprising:
transmitting, to the other UE, a request to enable communication via the second frequency band based at least in part on a change in the channel conditions associated with the one or more frequency components in the second frequency band.
9. The method of claim 1 , further comprising:
receiving, from a base station, information indicating the one or more beams to use to communicate with the other UE over the sidelink.
10. The method of claim 9 , further comprising:
transmitting, to the base station, information indicating one or more candidate beams for the one or more frequency components in the first frequency band and the one or more frequency components in the second frequency band, wherein the one or more beams indicated by the base station are selected from the one or more candidate beams.
11. The method of claim 1 , further comprising:
communicating with the other UE to autonomously select the one or more beams to use to communicate over the sidelink.
12. The method of claim 1 , wherein the set of frequency components to use in sidelink operation is determined based at least in part on one or more of the UE or the other UE indicating a preference with respect to a particular frequency band or one or more frequency components within a particular frequency band.
13. The method of claim 12 , wherein the preference is based at least in part on one or more of a frequency band used for access link communication with a base station, the channel conditions associated with the one or more frequency components in the first frequency band, the channel conditions associated with the one or more frequency components in the second frequency band, thermal overhead associated with one or more of the first frequency band or the second frequency band, or power consumption associated with one or more of the first frequency band or the second frequency band.
14. The method of claim 1 , wherein the first frequency band includes one or more frequencies in a first frequency range, and wherein the second frequency band includes one or more frequencies in a second frequency range.
15. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
determine a set of frequency components to use in sidelink operation based at least in part on an inter-band carrier aggregation configuration, wherein the set of frequency components includes one or more frequency components in a first frequency band and one or more frequency components in a second frequency band; and
communicate with another UE over a sidelink using one or more beams that are selected based at least in part on channel conditions associated with the one or more frequency components in the first frequency band and channel conditions associated with the one or more frequency components in the second frequency band.
16. The UE of claim 15 , wherein the one or more beams include a first beam associated with a first set of beam weights and a second beam associated with a second set of beam weights based at least in part on the channel conditions associated with the one or more frequency components in the first frequency band and the channel conditions associated with the one or more frequency components in the second frequency band.
17. The UE of claim 16 , wherein the first set of beam weights and the second set of beam weights are independently determined based at least in part on the UE and the other UE using different radio frequency chains to communicate over the sidelink in the first frequency band and the second frequency band.
18. The UE of claim 16 , wherein the first set of beam weights and the second set of beam weights are determined to mitigate performance loss in the first frequency band and the second frequency band based at least in part on the UE and the other UE using a common radio frequency chain to communicate over the sidelink in the first frequency band and the second frequency band.
19. The UE of claim 16 , wherein the first set of beam weights and the second set of beam weights are based at least in part on a first number of clusters in a channel of the first frequency band and a second number of clusters in a channel of the second frequency band.
20. The UE of claim 15 , wherein the one or more beams include only a beam associated with the first frequency band based at least in part on the channel conditions associated with the one or more frequency components in the second frequency band.
21. The UE of claim 20 , wherein the one or more processors are further configured to:
transmit, to the other UE, a request to mute the second frequency band.
22. The UE of claim 21 , wherein the one or more processors are further configured to:
transmit, to the other UE, a request to enable communication via the second frequency band based at least in part on a change in the channel conditions associated with the one or more frequency components in the second frequency band.
23. The UE of claim 15 , wherein the one or more processors are further configured to:
receive, from a base station, information indicating the one or more beams to use to communicate with the other UE over the sidelink.
24. The UE of claim 23 , wherein the one or more processors are further configured to:
transmit, to the base station, information indicating one or more candidate beams for the one or more frequency components in the first frequency band and the one or more frequency components in the second frequency band, wherein the one or more beams indicated by the base station are selected from the one or more candidate beams.
25. The UE of claim 15 , wherein the one or more processors are further configured to:
communicate with the other UE to autonomously select the one or more beams to use to communicate over the sidelink.
26. The UE of claim 15 , wherein the set of frequency components to use in sidelink operation is determined based at least in part on one or more of the UE or the other UE indicating a preference with respect to a particular frequency band or one or more frequency components within a particular frequency band.
27. The UE of claim 26 , wherein the preference is based at least in part on one or more of a frequency band used for access link communication with a base station, the channel conditions associated with the one or more frequency components in the first frequency band, the channel conditions associated with the one or more frequency components in the second frequency band, thermal overhead associated with one or more of the first frequency band or the second frequency band, or power consumption associated with one or more of the first frequency band or the second frequency band.
28. The UE of claim 15 , wherein the first frequency band includes one or more frequencies in a first frequency range, and wherein the second frequency band includes one or more frequencies in a second frequency range.
29. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to:
determine a set of frequency components to use in sidelink operation based at least in part on an inter-band carrier aggregation configuration, wherein the set of frequency components includes one or more frequency components in a first frequency band and one or more frequency components in a second frequency band; and
communicate with another UE over a sidelink using one or more beams that are selected based at least in part on channel conditions associated with the one or more frequency components in the first frequency band and channel conditions associated with the one or more frequency components in the second frequency band.
30. An apparatus for wireless communication, comprising:
means for determining a set of frequency components to use in sidelink operation based at least in part on an inter-band carrier aggregation configuration, wherein the set of frequency components includes one or more frequency components in a first frequency band and one or more frequency components in a second frequency band; and
means for communicating with a user equipment over a sidelink using one or more beams that are selected based at least in part on channel conditions associated with the one or more frequency components in the first frequency band and channel conditions associated with the one or more frequency components in the second frequency band.