Techniques for determining beams for beamforming wireless communications
Aspects described herein relate to configuring, at a device, default beam information for determining a beam for data channel communications. The device can determine to use the default beam information for configuring the beam for a data channel communication based on determining explicit beam information is not configured. In addition, the device can transmit, based on determining to use the default beam information, the data channel communication based on the beam configured using the default beam information.
1. A method for wireless communication, comprising:
at a user equipment (UE) configured for carrier aggregation using a plurality of component carriers (CCs) including at least a first CC that is configured to support a beam failure recovery process and a second CC that is not configured to support the beam failure recovery process, wherein the first CC corresponds to a first base station and the second CC corresponds to a second base station, and in response to a beam failure corresponding to the second CC:
configuring a beam failure recovery request (BFRQ) resource of the first CC for transmitting a BFRQ signal to reestablish a beam link for the second CC, wherein the first CC is a BFRQ reference CC for the plurality of CCs; and
transmitting the BFRQ signal corresponding to the second CC over the BFRQ resource of the first CC.
2. The method of claim 1 , wherein configuring the BFRQ resource is further based on identifying the second CC on which the beam failure occurred.
3. The method of claim 1 , wherein the first CC is used to transmit a control channel.
4. The method of claim 1 , further comprising monitoring at least one of the plurality of CCs for a BFRQ response.
5. The method of claim 1 , wherein the BFRQ resource comprises an uplink control channel resource.
6. The method of claim 5 , wherein the BFRQ signal is indicative of the second CC.
7. The method of claim 5 , wherein the BFRQ signal is indicative of a CC index or a CC group index corresponding to the second CC.
8. The method of claim 7 , wherein the BFRQ signal comprises one or more beam strength parameters for selecting a recovery beam.
9. An apparatus for use at a user equipment (UE) for wireless communication, the apparatus comprising:
a transceiver;
memory; and
one or more processors coupled to the transceiver and the memory, and wherein the one or more processors and memory are configured to:
support carrier aggregation using a plurality of component carriers (CCs) including, at least a first CC that is configured to support a beam failure recovery process and a second CC that is not configured to support the beam failure recovery process, wherein the first CC corresponds to a first base station and the second CC corresponds to a second base station, and in response to a beam failure corresponding to the second CC:
determine a beam failure recovery request (BFRQ) resource of the first CC for transmitting a BFRQ signal to reestablish a beam link for the second CC, wherein the first CC is a BFRQ reference CC for the plurality of CCs; and
initiate transmission of the BFRQ signal corresponding to the second CC over the BFRQ resource of the first CC.
10. The apparatus of claim 9 , wherein the one or more processors and the memory are further configured to determine the BFRQ resource further based, at least in part, on identifying the second CC on which the beam failure occurred.
11. The apparatus of claim 9 , wherein the first CC is used to transmit a control channel.
12. The apparatus of claim 9 , wherein the one or more processors and the memory are further configured to monitor at least one of the plurality of CCs for a BFRQ response.
13. The apparatus of claim 9 , wherein the BFRQ resource comprises an uplink control channel resource.
14. The apparatus of claim 13 , wherein the BFRQ signal is indicative of the second CC.
15. The apparatus of claim 13 , wherein the BFRQ signal is indicative of a CC index for the second CC or a CC group index for the second CC.
16. The apparatus of claim 15 , wherein the BFRQ signal is indicative of one or more beam strength parameters for selecting a recovery beam.
17. An apparatus for use in a user equipment (UE), the apparatus comprising:
means for responding to a beam failure in a carrier aggregation using a plurality of component carriers (CCs) including at least a first CC that is configured to support a beam failure recovery process and a second CC that is not configured to support the beam failure recovery process, wherein the first CC corresponds to a first base station and the second CC corresponds to a second base station, and the beam failure corresponds to the second CC:
means for configuring a beam failure recovery request (BFRQ) resource of the first CC for transmitting a BFRQ signal to reestablish a beam link for the second CC, wherein the first CC is a BFRQ reference CC for the plurality of CCs; and
means for transmitting the BFRQ signal corresponding to the second CC over the BFRQ resource of the first CC.
18. The apparatus of claim 17 , wherein the first CC is used to transmit a control channel.
19. The apparatus of claim 17 , wherein the BFRQ resource comprises an uplink control channel resource.
20. An article of manufacture comprising:
a non-transitory computer-readable medium having stored therein instructions executable by one or more processors of a user equipment (UE) to:
support carrier aggregation using a plurality of component carriers (CCs) including, at least a first CC that is configured to support a beam failure recovery process and a second CC that is not configured to support the beam failure recovery process, wherein the first CC corresponds to a first base station and the second CC corresponds to a second base station, and in response to a beam failure corresponding to the second CC:
configure a beam failure recovery request (BFRQ) resource of the first CC for transmitting a BFRQ signal to reestablish a beam link for the second CC, wherein the first CC is a BFRQ reference CC for the plurality of CCs; and
initiate transmission of the BFRQ signal corresponding to the second CC over the BFRQ resource of the first CC.
21. The article of claim 20 , wherein the instructions are further executable by the one or more processors to:
identify the second CC on which the beam failure occurred.
22. The article of claim 20 , wherein the first CC is used to transmit a control channel.
23. The apparatus of claim 17 , further comprising:
means for monitoring at least one of the plurality of CCs for a BFRQ response.
24. The article of claim 20 , wherein the instructions are further executable by the one or more processors to monitor at least one of the plurality of CCs for a BFRQ response.
25. The method of claim 1 , further comprising detecting the beam failure.
26. The apparatus of claim 9 , wherein the one or more processors and the memory are further configured to detect the beam failure.