Beam failure recovery for uplink
Various embodiments herein provide techniques for beam failure recovery in uplink. A user equipment (UE) may be configured with one or more thresholds, such as one or more power-related thresholds and/or one or more duty cycle thresholds. The UE may proactively detect a beam failure event based on the one or more thresholds. Other embodiments may be described and claimed.
1. One or more non-transitory, computer-readable media (NTCRM) having instructions, stored thereon, that when executed cause a user equipment (UE) to:
receive, from an access node, configuration information to configure one or more thresholds, the one or more thresholds to include a power-related threshold or a duty-cycle related threshold; and
detect a beam failure event in an uplink based on the one or more thresholds;
identify a new beam for the uplink based on power management maximum power reduction (P-MPR); and
provide, to the access node or another access node, an indication of the new beam.
2. The one or more NTCRM of claim 1 , wherein performance of the detection is based on user proximity detection.
3. The one or more NTCRM of claim 1 , wherein the instructions, when executed, are further to cause the UE to perform one or more measurements on one or more beam failure reference signals, wherein the detection is further based on the one or more measurements.
4. The one or more NTCRM of claim 3 , wherein the one or more beam failure reference signals include a synchronization signal block (SSB).
5. The one or more NTCRM of claim 3 , wherein the one or more beam failure reference signals include a channel state information (CSI)- reference signal (RS).
6. The one or more NTCRM of claim 3 , wherein the one or more beam failure reference signals include one or more downlink reference signals configured in spatial relation information of a physical uplink control channel (PUCCH).
7. The one or more NTCRM of claim 3 , wherein the one or more measurements include at least one of a block error rate (BLER) measurement or an uplink received signal received power (RSRP) measurement.
8. The one or more NTCRM of claim 3 , wherein the one or more measurements are derived based on one or more of transmission power information of an access node, or uplink power management maximum power reduction (P-MPR) of the UE for a corresponding beam.
9. The one or more NTCRM of claim 1 , wherein the one or more thresholds include a hypothetical block error rate (BER) of a PUCCH.
10. The one or more NTCRM of claim 1 , wherein the one or more thresholds include a hypothetical uplink received signal received power (RSRP).
11. The one or more NTCRM of claim 1 , wherein the detection is a proactive detection.
12. The one or more NTCRM of claim 1 , wherein the new beam includes a spatial filter.
13. The one or more NTCRM of claim 1 , wherein the instructions, when executed, further cause the UE to perform measurements on candidate beams, wherein the new beam is identified from the candidate beams based on the measurements.
14. The one or more NTCRM of claim 13 , wherein the measurements are performed on an SSB and/or a CSI-RS.
15. The one or more NTCRM of claim 13 , wherein the new beam is identified based on a comparison of the measurements to a quality threshold.
16. The one or more NTCRM of claim 15 , wherein quality threshold includes at least one of BLER of PUCCH or UL RSRP.
17. The one or more NTCRM of claim 1 , wherein the indication of the new beam is included in a MAC CE or an index beam report.
18. The one or more NTCRM of claim 1 , wherein the new beam is indicated using a PRACH transmission.
19. The one or more NTCRM of claim 18 , wherein the new beam is indicated based on an association with a PRACH sequence and/or a PRACH occasion of the PRACH transmission.
20. The one or more NTCRM of claim 1 , wherein the one or more thresholds include a power-related threshold and a duty-cycle related threshold.