Reporting multiple replacement beams in beam failure recovery requests
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may communicate with a wireless network using multiple beams. For example, the UE may communicate with different transmission/reception points (TRPs) using different beams, communicate using different downlink and uplink beams, communicate using different beams in different component carriers (CCs), or any combination thereof. If the UE detects a single beam failure, the UE may indicate multiple new beams in a beam failure recovery request (BFRQ). The UE may select a new beam based on the detected beam failure and may determine one or more additional new beams (e.g., for a different TRP, link direction, or CC than the failed beam) that are compatible with the selected new beam to further indicate in the BFRQ. The UE may receive a beam failure recovery response (BFRR) in response to the BFRQ and may communicate using the new beams.
1 . An apparatus for wireless communications at a user equipment (UE), comprising:
one or more memories; and
one or more processors coupled with the one or more memories and configured to cause the UE to:
output a first signal that comprises a beam failure recovery request in response to a detection of a beam failure of a beam pair link with a first transmission/reception point, wherein the beam failure recovery request indicates a first network beam at the first transmission/reception point based at least in part on the beam failure of the beam pair link with the first transmission/reception point, and the beam failure recovery request indicates a second network beam at a second transmission/reception point based at least in part on the first network beam and a UE beam configuration supported by the UE that comprises one or more UE beams corresponding to the first network beam and the second network beam;
obtain, in response to the beam failure recovery request, a second signal that comprises a beam failure recovery response; and
communicate with the first transmission/reception point and the second transmission/reception point via the one or more UE beams based at least in part on the beam failure recovery response.
2 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the UE to:
store a transmission configuration indicator state codepoint that comprises a first transmission configuration indicator state for the first transmission/reception point and a second transmission configuration indicator state for the second transmission/reception point; and
determine the second network beam based at least in part on the first transmission configuration indicator state that corresponds to the first network beam and the second transmission configuration indicator state that corresponds to the second network beam.
3 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the UE to:
output a third signal to indicate a plurality of network beam configurations that correspond to respective UE beam configurations supported by the UE, wherein the respective UE beam configurations comprise at least the UE beam configuration supported by the UE.
4 . The apparatus of claim 3 , wherein the one or more processors are further configured to cause the UE to:
determine the plurality of network beam configurations based at least in part on the first transmission/reception point, the second transmission/reception point, a capability of the UE, a first channel associated with the UE and the first transmission/reception point, a second channel associated with the UE and the second transmission/reception point, a multiplexing scheme for the UE, or a combination thereof.
5 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the UE to:
obtain a new beam identification reference signal that corresponds to the first network beam; and
determine the first network beam based at least in part on the new beam identification reference signal, wherein the beam failure recovery request indicates the first network beam based at least in part on the determination.
6 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the UE to:
maintain a second beam pair link with the second transmission/reception point concurrent to the detection of the beam failure of the beam pair link with the first transmission/reception point and concurrent to the first signal that comprises the beam failure recovery request being output.
7 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the UE to:
support the UE beam configuration based at least in part on the UE supporting concurrent reception via a first UE beam of the UE beam configuration that corresponds to the first network beam and a second UE beam of the UE beam configuration that corresponds to the second network beam in a spatial-division multiplexing scheme.
8 . The apparatus of claim 1 , wherein the one or more processors are further configured to cause the UE to:
initiate a timer in response to the obtained second signal that comprises the beam failure recovery response; and
activate the UE beam configuration based at least in part on an expiration of the timer, the communication with the first transmission/reception point and the second transmission/reception point via the one or more UE beams being further based at least in part on the activation of the UE beam configuration.
9 . The apparatus of claim 1 , further comprising a transceiver, wherein, to communicate with the first transmission/reception point and the second transmission/reception point, the one or more processors are configured to cause the UE to:
obtain, via the transceiver, a downlink signal from the first transmission/reception point or from the second transmission/reception point or both; and
output, via the transceiver, an uplink signal to the first transmission/reception point or to the second transmission/reception point or both.
10 . An apparatus for wireless communications at a device in a wireless network, comprising:
one or more memories; and
one or more processors coupled with the one or more memories and configured to cause the device in the wireless network to:
obtain a first signal comprising a beam failure recovery request that indicates a beam failure of a beam pair link between a user equipment (UE) and a first transmission/reception point, wherein the beam failure recovery request further indicates a first network beam at the first transmission/reception point based at least in part on the beam failure of the beam pair link between the UE and the first transmission/reception point, and the beam failure recovery request further indicates a second network beam at a second transmission/reception point based at least in part on the first network beam and a UE beam configuration supported by the UE that corresponds to the first network beam at the first transmission/reception point and the second network beam at the second transmission/reception point;
output, in response to the beam failure recovery request, a second signal that comprises a beam failure recovery response; and
communicate via the first network beam or the second network beam or both based at least in part on the beam failure recovery response.
11 . The apparatus of claim 10 , wherein the one or more processors are further configured to cause the device in the wireless network to:
obtain a third signal that indicates a plurality of network beam configurations corresponding to respective UE beam configurations supported by the UE; and
determine the UE beam configuration supported by the UE based at least in part on the indicated plurality of network beam configurations.
12 . The apparatus of claim 10 , further comprising a transceiver, wherein, to communicate, the one or more processors are configured to cause the device in the wireless network to:
communicate via the transceiver and via the first network beam based at least in part on the device in the wireless network comprising the first transmission/reception point.
13 . The apparatus of claim 10 , further comprising a transceiver, wherein, to communicate, the one or more processors are configured to cause the device in the wireless network to:
communicate via the transceiver and via the second network beam based at least in part on the device in the wireless network comprising the second transmission/reception point.
14 . A method for wireless communication at a user equipment (UE), comprising:
outputting a first signal that comprises a beam failure recovery request in response to a detection of a beam failure of a beam pair link with a first transmission/reception point, wherein the beam failure recovery request indicates a first network beam at the first transmission/reception point based at least in part on the beam failure of the beam pair link with the first transmission/reception point, and the beam failure recovery request indicates a second network beam at a second transmission/reception point based at least in part on the first network beam and a UE beam configuration supported by the UE that comprises one or more UE beams corresponding to the first network beam and the second network beam;
obtaining, in response to the beam failure recovery request, a second signal that comprises a beam failure recovery response; and
communicating with the first transmission/reception point and the second transmission/reception point via the one or more UE beams based at least in part on the beam failure recovery response.
15 . The method of claim 14 , further comprising:
storing a transmission configuration indicator state codepoint that comprises a first transmission configuration indicator state for the first transmission/reception point and a second transmission configuration indicator state for the second transmission/reception point; and
determining the second network beam based at least in part on the first transmission configuration indicator state that corresponds to the first network beam and the second transmission configuration indicator state that corresponds to the second network beam.
16 . The method of claim 14 , further comprising:
outputting a third signal to indicate a plurality of network beam configurations that correspond to respective UE beam configurations supported by the UE, wherein the respective UE beam configurations comprise at least the UE beam configuration supported by the UE.
17 . The method of claim 16 , further comprising:
determining the plurality of network beam configurations based at least in part on the first transmission/reception point, the second transmission/reception point, a capability of the UE, a first channel associated with the UE and the first transmission/reception point, a second channel associated with the UE and the second transmission/reception point, a multiplexing scheme for the UE, or a combination thereof.
18 . The method of claim 14 , further comprising:
obtaining a new beam identification reference signal that corresponds to the first network beam; and
determining the first network beam based at least in part on the new beam identification reference signal, wherein the beam failure recovery request indicates the first network beam based at least in part on the determination.
19 . The method of claim 14 , further comprising:
maintaining a second beam pair link with the second transmission/reception point concurrent to the detection of the beam failure of the beam pair link with the first transmission/reception point and concurrent to the first signal that comprises the beam failure recovery request being output.
20 . The method of claim 14 , further comprising:
supporting the UE beam configuration based at least in part on the UE supporting concurrent reception via a first UE beam of the UE beam configuration that corresponds to the first network beam and a second UE beam of the UE beam configuration that corresponds to the second network beam in a spatial-division multiplexing scheme.
21 . The method of claim 14 , further comprising:
initiating a timer in response to the obtained second signal that comprises the beam failure recovery response; and
activating the UE beam configuration based at least in part on an expiration of the timer, the communication with the first transmission/reception point and the second transmission/reception point via the one or more UE beams being further based at least in part on the activation of the UE beam configuration.
22 . The method of claim 14 , wherein the communicating comprises:
obtaining a downlink signal from the first transmission/reception point or from the second transmission/reception point or both; and
outputting an uplink signal to the first transmission/reception point or to the second transmission/reception point or both.
23 . A method for wireless communication at a device in a wireless network, comprising:
obtaining a first signal comprising a beam failure recovery request that indicates a beam failure of a beam pair link between a user equipment (UE) and a first transmission/reception point, wherein the beam failure recovery request further indicates a first network beam at the first transmission/reception point based at least in part on the beam failure of the beam pair link between the UE and the first transmission/reception point, and the beam failure recovery request further indicates a second network beam at a second transmission/reception point based at least in part on the first network beam and a UE beam configuration supported by the UE that corresponds to the first network beam at the first transmission/reception point and the second network beam at the second transmission/reception point;
outputting, in response to the beam failure recovery request, a second signal that comprises a beam failure recovery response; and
communicating via the first network beam or the second network beam or both based at least in part on the beam failure recovery response.
24 . The method of claim 23 , further comprising:
obtaining a third signal that indicates a plurality of network beam configurations corresponding to respective UE beam configurations supported by the UE; and
determining the UE beam configuration supported by the UE based at least in part on the indicated plurality of network beam configurations.
25 . The method of claim 23 , wherein the communicating comprises:
communicating via the first network beam based at least in part on the device in the wireless network comprising the first transmission/reception point.
26 . The method of claim 23 , wherein the communicating comprises:
communicating via the second network beam based at least in part on the device in the wireless network comprising the second transmission/reception point.
27 . A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by at least one processor to cause the UE to:
output a first signal that comprises a beam failure recovery request in response to a detection of a beam failure of a beam pair link with a first transmission/reception point, wherein the beam failure recovery request indicates a first network beam at the first transmission/reception point based at least in part on the beam failure of the beam pair link with the first transmission/reception point, and the beam failure recovery request indicates a second network beam at a second transmission/reception point based at least in part on the first network beam and a UE beam configuration supported by the UE that comprises one or more UE beams corresponding to the first network beam and the second network beam;
obtain, in response to the beam failure recovery request, a second signal that comprises a beam failure recovery response; and
communicate with the first transmission/reception point and the second transmission/reception point via the one or more UE beams based at least in part on the beam failure recovery response.
28 . The non-transitory computer-readable medium of claim 27 , wherein the instructions are further executable by the at least one processor to cause the UE to:
store a transmission configuration indicator state codepoint that comprises a first transmission configuration indicator state for the first transmission/reception point and a second transmission configuration indicator state for the second transmission/reception point; and
determine the second network beam based at least in part on the first transmission configuration indicator state that corresponds to the first network beam and the second transmission configuration indicator state that corresponds to the second network beam.
29 . The non-transitory computer-readable medium of claim 27 , wherein the instructions are further executable by the at least one processor to cause the UE to:
output a third signal to indicate a plurality of network beam configurations that correspond to respective UE beam configurations supported by the UE, wherein the respective UE beam configurations comprise at least the UE beam configuration supported by the UE.
30 . A non-transitory computer-readable medium storing code for wireless communication at a device in a wireless network, the code comprising instructions executable by at least one processor to cause the device in the wireless network to:
obtain a first signal comprising a beam failure recovery request that indicates a beam failure of a beam pair link between a user equipment (UE) and a first transmission/reception point, wherein the beam failure recovery request further indicates a first network beam at the first transmission/reception point based at least in part on the beam failure of the beam pair link between the UE and the first transmission/reception point, and the beam failure recovery request further indicates a second network beam at a second transmission/reception point based at least in part on the first network beam and a UE beam configuration supported by the UE that corresponds to the first network beam at the first transmission/reception point and the second network beam at the second transmission/reception point;
output, in response to the beam failure recovery request, a second signal that comprises a beam failure recovery response; and
communicate via the first network beam or the second network beam or both based at least in part on the beam failure recovery response.