Techniques for beam selection with uplink consideration

Patent metadata

Field	Value
Publication number	US-12445861-B2
Application number	US-202217901440-A
Country	US
Kind code	B2
Filing date	Sep 1, 2022
Priority date	Sep 1, 2022
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may select a set of candidate UE beams for measuring channel state information (CSI) reference signal (CSI-RS) based on one or more power measurements for uplink transmissions. The UE may measure multiple synchronization signal blocks (SSBs) using the set of candidate UE beams and select a subset of the selected candidate beams based on the SSB measurements. The UE may measure spectral efficiency via the resource carrying the CSI-RS using the subset of candidate UE beams and select a serving beam from the subset based on the spectral efficiency of each beam. The UE may calculate the power measurements based on a difference between a power threshold and a reference power value for each candidate beam.

First claim

What is claimed is:

1. A method for wireless communication at a user equipment (UE), comprising:
measuring a set of synchronization signal blocks;
selecting a set of candidate beams for measuring a channel state information reference signal based at least in part on a power measurement associated with an uplink performance;
selecting a subset of the set of candidate beams for measuring the channel state information reference signal based at least in part on the measurements of the set of synchronization signal blocks;
measuring a spectral efficiency using a first candidate beam from the subset of the set of candidate beams based at least in part on the channel state information reference signal; and
transmitting, to a network entity, the measurement of the spectral efficiency based at least in part on measuring the spectral efficiency using the first candidate beam.

2. The method of claim 1 , further comprising:
calculating the power measurement based at least in part on a difference between a power threshold and a reference power value; and
determining a quantity of UE beams for the set of candidate beams based at least in part on the calculated power measurement.

3. The method of claim 2 , further comprising:
calculating the power threshold based at least in part on a difference between a transmit power value, a first power reduction value, and a second power reduction value, wherein the power threshold is a maximum transmit power limit.

4. The method of claim 2 , further comprising:
calculating the reference power value based at least in part on a combination of an uplink channel value, a pathloss value, a frequency, and a bandwidth value, wherein the reference power value is a reference requested power.

5. The method of claim 4 , wherein the bandwidth value comprises a maximum transmission bandwidth and a quantity of carriers.

6. The method of claim 1 , wherein the power measurement comprises one or more virtual power headroom values associated with respective beams of the set of candidate beams.

7. The method of claim 1 , wherein selecting the set of candidate beams is based at least in part on the power measurement being positive.

8. The method of claim 1 , further comprising:
selecting a serving UE beam for measuring the channel state information reference signal based at least in part on the measurements of the set of synchronization signal blocks; and
generating a measurement report based at least in part on the measurement of the spectral efficiency and a last channel state information reference signal measurement on the serving UE beam.

9. The method of claim 8 , further comprising:
reselecting the serving UE beam based at least in part on measuring the channel state information reference signal.

10. The method of claim 9 , wherein reselecting the serving UE beam further comprises:
performing a filtering, a biasing, a thresholding, or any combination thereof, for a first rank and a second rank of a measurement of the channel state information reference signal, wherein reselection of the serving UE beam is based at least in part on the filtering, the biasing, the thresholding, or any combination thereof.

11. The method of claim 1 , further comprising:
predicting a set of time resources for the channel state information reference signal based at least in part on one or more previous channel state information reference signal configurations.

12. The method of claim 1 , further comprising:
determining a slot format for a slot including a set of time resources for the channel state information reference signal, wherein the slot format comprises at least one downlink shared channel resource; and
monitoring the slot using the first candidate beam based at least in part on determining the slot format, wherein the channel state information reference signal is measured based at least in part on monitoring the slot.

13. The method of claim 12 , further comprising:
measuring a demodulation reference signal on the at least one downlink shared channel resource using the first candidate beam; and
performing channel estimation for the slot based at least in part on measuring the demodulation reference signal.

14. The method of claim 1 , further comprising:
using the first candidate beam for a plurality of slots based at least in part on a time window around a set of time resources for the channel state information reference signal, wherein the channel state information reference signal is measured during at least a symbol in the plurality of slots.

15. The method of claim 14 , further comprising:
determining a scheduling variation for the network entity, wherein the first candidate beam is used for the plurality of slots based at least in part on the scheduling variation.

16. The method of claim 14 , wherein using the first candidate beam for the plurality of slots comprises:
using the first candidate beam for uplink communications and downlink communications during the plurality of slots.

17. The method of claim 1 , further comprising:
monitoring a slot including a set of time resources for the channel state information reference signal using the first candidate beam, wherein the channel state information reference signal is measured on a different symbol of the slot than a predicted symbol for the channel state information reference signal of the set of time resources.

18. The method of claim 1 , further comprising:
identifying a set of time resources for the channel state information reference signal based at least in part on one or more previous channel state information reference signal configurations;
identifying an aperiodic reference signal resource configuration from the one or more previous channel state information reference signal configurations; and
determining scheduling information for one or more previous channel state information measurements based at least in part on the aperiodic reference signal resource configuration, wherein the set of time resources is identified based at least in part on the scheduling information.

19. The method of claim 1 , further comprising:
measuring the spectral efficiency separately for each rank of the first candidate beam.

20. The method of claim 1 , further comprising:
updating the subset based at least in part on measuring the channel state information reference signal, additional synchronization signal block measurements, one or more channel state information reference signal measurements using one or more additional candidate UE beams, or any combination thereof.

21. The method of claim 1 , wherein identifying the subset comprises:
identifying the subset from a subset of beams used for the measurements of the set of synchronization signal blocks.

22. The method of claim 21 , wherein the subset of the set of candidate beams are identified based at least in part on a reference signal received power measurement of the subset of beams used for the measurements of the set of synchronization signal blocks.

23. The method of claim 21 , wherein the subset of the set of candidate beams are identified based at least in part on a channel impulse response measurement of the subset of beams used for the measurements of the set of synchronization signal blocks.

24. The method of claim 21 , wherein the subset of the set of candidate beams are identified based at least in part on an uplink link budget of the UE.

25. The method of claim

Assignees

• Qualcomm Inc

Inventors

• Zhu Jun
• Challa Raghu Narayan
• Banister Brian Clarke

Classifications

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04B7/088

  using beam selection · CPC title

• H04B7/06958

  Multistage beam selection, e.g. beam refinement · CPC title

• H04W16/28 Primary

  using beam steering · CPC title