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 . A user equipment (UE) for wireless communications, comprising:
one or more processors; and
one or more memories coupled with the one or more processors, the one or more processors configured to cause the UE to:
output a first signal comprising a beam failure recovery request in response to a detection of a beam failure of a downlink connection, wherein the beam failure recovery request indicates a downlink network beam based at least in part on the beam failure of the downlink connection, and wherein the beam failure recovery request further indicates an uplink network beam based at least in part on the downlink network beam;
obtain, in response to the beam failure recovery request, a second signal that comprises a beam failure recovery response; and
communicate via a downlink UE beam corresponding to the downlink network beam and via an uplink UE beam corresponding to the uplink network beam based at least in part on the beam failure recovery response.
2 . The UE of claim 1 , wherein the one or more processors are further configured to cause the UE to:
determine the uplink network beam further based at least in part on a permissible exposure threshold for the UE.
3 . The UE of claim 1 , wherein, to communicate via the downlink UE beam and the uplink UE beam, the one or more processors are configured to cause the UE to:
obtain, via a transceiver, a downlink signal via the downlink UE beam; and
output, via the transceiver, an uplink signal via the uplink UE beam.
4 . The UE of claim 1 , wherein the one or more processors are further configured to:
obtain a new beam identification reference signal; and
determine the downlink UE beam based at least in part on the new beam identification reference signal.
5 . The UE of claim 4 , wherein the beam failure recovery request indicates the downlink UE beam based at least in part on a determination of the downlink UE beam.
6 . The UE of claim 1 , wherein the one or more processors are further configured to cause the UE to:
maintain a connection concurrent to detection of the beam failure and concurrent to transmission of the first signal.
7 . The UE of claim 1 , wherein the one or more processors are further configured to cause the UE to:
initiate a timer in response to reception of the second signal comprising the beam failure recovery response; and
activate the downlink UE beam and the uplink UE beam based at least in part on an expiration of the timer.
8 . The UE of claim 7 , wherein communication via the downlink UE beam and via the uplink UE beam is further based at least in part on activation of the downlink UE beam and the uplink UE beam.
9 . The UE of claim 1 , wherein, to output the first signal, the one or more processors are further configured to cause the UE to:
transmit the first signal via a transceiver.
10 . The UE of claim 1 , wherein, to obtain the second signal, the one or more processors are further configured to cause the UE to:
receive the second signal via a transceiver.
11 . An apparatus for wireless communications at a device in a wireless network, comprising:
one or more processors; and
one or more memories coupled with the one or more processors, the one or more processors configured to cause the device to:
obtain a first signal comprising a beam failure recovery request that indicates a beam failure of a downlink connection with a user equipment (UE), wherein the beam failure recovery request indicates a downlink network beam based at least in part on the beam failure of the downlink connection, and wherein the beam failure recovery request further indicates an uplink network beam based at least in part on the downlink network beam;
output, in response to the beam failure recovery request, a second signal that comprises a beam failure recovery response; and
communicate, via the downlink network beam, or the uplink network beam, or both, based at least in part on the beam failure recovery response.
12 . The apparatus of claim 11 , further comprising a transceiver, wherein, to communicate, the one or more processors are configured to cause the device to:
output, via the transceiver, a downlink signal via the downlink network beam based at least in part on the device in the wireless network comprising a transmission/reception point that supports the downlink network beam.
13 . The apparatus of claim 11 , further comprising a transceiver, wherein, to communicate, the one or more processors are configured to cause the device to:
obtain, via the transceiver, an uplink signal via the uplink network beam based at least in part on the device in the wireless network comprising a transmission/reception point that supports the uplink network beam.
14 . A method for wireless communications at a user equipment (UE), comprising:
outputting a first signal comprising a beam failure recovery request in response to a detection of a beam failure of a downlink connection, wherein the beam failure recovery request indicates a downlink network beam based at least in part on the beam failure of the downlink connection, and wherein the beam failure recovery request further indicates an uplink network beam based at least in part on the downlink network beam;
obtaining, in response to the beam failure recovery request, a second signal comprising a beam failure recovery response; and
communicating via a downlink UE beam corresponding to the downlink network beam and via an uplink UE beam corresponding to the uplink network beam based at least in part on the beam failure recovery response.
15 . The method of claim 14 , further comprising:
determining the uplink network beam further based at least in part on a permissible exposure threshold for the UE.
16 . The method of claim 14 , wherein communicating via the downlink UE beam and the uplink UE beam further comprises:
obtaining, via a transceiver, a downlink signal via the downlink UE beam; and
outputting, via the transceiver, an uplink signal via the uplink UE beam.
17 . The method of claim 14 , further comprising:
obtaining a new beam identification reference signal; and
determining the downlink UE beam based at least in part on the new beam identification reference signal.
18 . The method of claim 17 , wherein the beam failure recovery request indicates the downlink UE beam based at least in part on a determination of the downlink UE beam.
19 . The method of claim 14 , further comprising:
maintaining a connection concurrent to detection of the beam failure and concurrent to transmission of the first signal.
20 . The method of claim 14 , further comprising:
initiating a timer in response to reception of the second signal comprising the beam failure recovery response; and
activating the downlink UE beam and the uplink UE beam based at least in part on an expiration of the timer.