US-12621034-B2 - One-shot beam management

Abstract

Methods and apparatus for beam management where a beam is selected based on an estimated channel correlation matrix. The apparatus determines a channel correlation matrix based on downlink SSB reference signal received at the UE. The apparatus estimates a RSRP of a plurality of beams associated with an uplink channel based on the channel correlation matrix and associated beam weights. The apparatus selects a first beam from the plurality of beams having a highest estimated RSRP for communication with a base station. The apparatus communicates with the base station via the first beam.

Inventors

• Kang GAO
• Yongle WU
• Jun Zhu
• Mihir Vijay Laghate
• Derrick Albert CHU
• Raghu Narayan Challa

Assignees

• QUALCOMM INCORPORATED

Dates

Publication Date

20260505

Application Date

20221028

Claims (20)

1. 1 . An apparatus for wireless communication at a user equipment (UE), comprising: memory; and at least one processor coupled to the memory and, based at least in part on information stored in the memory, the at least one processor is configured to: determine a channel correlation matrix based on downlink synchronization signal block (SSB) reference signal received at the UE; estimate, across a plurality of antenna elements, a reference signal received power (RSRP) of a plurality of beams at a same time based on the channel correlation matrix and associated beam weights, wherein the RSRP of each of the plurality of beams is associated with an uplink channel; select a first beam from the plurality of beams having a highest estimated RSRP for communication with a base station; and communicate with the base station via the first beam.
2. 2 . The apparatus of claim 1 , further comprising a transceiver coupled to the at least one processor.
3. 3 . The apparatus of claim 1 , wherein to determine the channel correlation matrix, the at least one processor is configured to: measure a channel impulse response (CIR) of a first SSB in a first synchronization signal burst set (SSBS) on a first set of antenna elements; measure the CIR of the first SSB in a second SSBS on a second set of antenna elements; and determine a phase difference between the first set of antenna elements in the first SSBS and the second set of antenna elements in the second SSBS within the first SSB.
4. 4 . The apparatus of claim 3 , wherein at least one antenna element is shared between the first set of antenna elements and the second set of antenna elements.
5. 5 . The apparatus of claim 4 , wherein the at least one antenna element shared between the first set of antenna elements and the second set of antenna elements is a reference beam utilized to determine the phase difference.
6. 6 . The apparatus of claim 3 , wherein the at least one processor is further configured to: align phases of the phase difference between the first set of antenna elements measured at the first SSBS and the second set of antenna elements measured at the second SSBS within the first SSB to determine the channel correlation matrix based on a correlation between the CIR of the first set of antenna elements and the second set of antenna elements.
7. 7 . The apparatus of claim 3 , wherein at least a physical broadcast channel (PBCH) and a synchronization signal of the first SSB of the first SSBS are measured to determine the CIR.
8. 8 . The apparatus of claim 7 , wherein to measure beams associated with a first symbol and a second symbol of the PBCH and a symbol of the first SSB, the at least one processor is configured to measure beams associated with the first symbol and the second symbol of the PBCH and the symbol of the first SSB within the first SSBS.
9. 9 . The apparatus of claim 3 , wherein to estimate the RSRP for each beam of the plurality of beams, the at least one processor is configured to estimate the RSRP for each beam of the plurality of beams based on a combination of the CIR for each antenna elements within the first set of antenna elements and the second set of antenna elements with the associated beam weights.
10. 10 . A method of wireless communication at a user equipment (UE), comprising: determining a channel correlation matrix based on downlink synchronization signal block (SSB) reference signal received at the UE; estimating, across a plurality of antenna elements, a reference signal received power (RSRP) of a plurality of beams at a same time based on the channel correlation matrix and associated beam weights, wherein the RSRP of each of the plurality of beams is associated with an uplink channel; selecting a first beam from the plurality of beams having a highest estimated RSRP for communication with a base station; and communicating with the base station via the first beam.
11. 11 . The method of claim 10 , wherein the determining the channel correlation matrix further comprising: measuring a channel impulse response (CIR) of a first SSB in a first synchronization signal burst set (SSBS) on a first set of antenna elements; measuring the CIR of the first SSB in a second SSBS on a second set of antenna elements; and determining a phase difference between the first set of antenna elements in the first SSBS and the second set of antenna elements in the second SSBS within the first SSB.
12. 12 . The method of claim 11 , wherein at least one antenna element is shared between the first set of antenna elements and the second set of antenna elements.
13. 13 . The method of claim 12 , wherein the at least one antenna element shared between the first set of antenna elements and the second set of antenna elements is a reference beam utilized to determine the phase difference.
14. 14 . The method of claim 11 , further comprising: aligning phases of the phase difference between the first set of antenna elements measured at the first SSBS and the second set of antenna elements measured at the second SSBS within the first SSB to determine the channel correlation matrix based on a correlation between the CIR of the first set of antenna elements and the second set of antenna elements.
15. 15 . The method of claim 11 , wherein at least a physical broadcast channel (PBCH) and a synchronization signal of the first SSB of the first SSBS are measured to determine the CIR.
16. 16 . The method of claim 15 , wherein beams associated with a first symbol and a second symbol of the PBCH and a symbol of the first SSB are measured within the first SSBS.
17. 17 . The method of claim 11 , wherein the RSRP for each beam of the plurality of beams is estimated based on a combination of the CIR for each antenna elements within the first set of antenna elements and the second set of antenna elements with the associated beam weights.
18. 18 . An apparatus for wireless communication at a user equipment (UE), comprising: means for determining a channel correlation matrix based on downlink synchronization signal block (SSB) reference signal received at the UE; means for estimating, across a plurality of antenna elements, a reference signal received power (RSRP) of a plurality of beams at a same time based on the channel correlation matrix and associated beam weights, wherein the RSRP of each of the plurality of beams is associated with an uplink channel; means for selecting a first beam from the plurality of beams having a highest estimated RSRP for communication with a base station; and means for communicating with the base station via the first beam.
19. 19 . The apparatus of claim 18 , wherein the means for determining the channel correlation matrix further comprising: means for measuring a channel impulse response (CIR) of a first SSB in a first synchronization signal burst set (SSBS) on a first set of antenna elements; means for measuring the CIR of the first SSB in a second SSBS on a second set of antenna elements; and means for determining a phase difference between the first set of antenna elements in the first SSBS and the second set of antenna elements in the second SSBS within the first SSB.
20. 20 . The apparatus of claim 19 , wherein at least one antenna element is shared between the first set of antenna elements and the second set of antenna elements.

Description

TECHNICAL FIELD The present disclosure relates generally to communication systems, and more particularly, to a configuration for beam management. INTRODUCTION Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. BRIEF SUMMARY The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects. This summary neither identifies key or critical elements of all aspects nor delineates the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a device at a UE. The device may be a processor and/or a modem at a UE or the UE itself. The apparatus determines a channel correlation matrix based on downlink synchronization signal block (SSB) reference signal received at the UE. The apparatus estimates a reference signal received power (RSRP) of a plurality of beams associated with an uplink channel based on the channel correlation matrix and associated beam weights. The apparatus selects a first beam from the plurality of beams having a highest estimated RSRP for communication with a base station. The apparatus communicates with the base station via the first beam. To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network. FIG. 2A is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure. FIG. 2B is a diagram illustrating an example of downlink (DL) channels within a subframe, in accordance with various aspects of the present disclosure. FIG. 2C is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure. FIG. 2D is a diagram illustrating an example of uplink (UL) channels within a subframe, in accordance with various aspects of the present disclosure. FIG. 3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network. FIG. 4 illustrates an example of a beam management configuration, in accordance with aspects presented herein. FIG. 5 is a call flow diagram of signaling between a UE and a base station. FIG. 6 is a flowchart of a method of wireless communication. FIG. 7 is a flowchart of a method of wireless communication. FIG. 8 is a diagram illustrating an example of a hardware implementation for an example apparatus and/or network entity. DETAILED DESCRIPTION In wireless communications, beam management may rely on a parent, child, or neighbor beam relationship for beam tracking. Beam tracking of parent, child, or ne