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EP-4740309-A1 - NETWORK NODE-TO-RIS BEAM REFINEMENT

EP4740309A1EP 4740309 A1EP4740309 A1EP 4740309A1EP-4740309-A1

Abstract

A method of wireless communication at a first network node is disclosed herein. The method includes performing beam training with a RIS-MT array, wherein the RIS-MT array is associated with a RIS array. The method includes identifying, based on the beam training, a first beam for communication with the RIS-MT array. The method includes transmitting communication to the RIS array for reflection or refraction to a wireless device using a second beam based, at least in part, on the first beam identified for the RIS-MT array.

Inventors

  • PRASAD, NARAYAN
  • ABEDINI, NAVID
  • LUO, TAO
  • LI, JUNYI

Assignees

  • QUALCOMM INCORPORATED

Dates

Publication Date
20260513
Application Date
20240607

Claims (20)

  1. 1. An apparatus for wireless communication at a first network node, comprising: at least one memory; and at least one processor coupled to the at least one memory and, based at least in part on information stored in the at least one memory, the at least one processor, individually or in any combination, is configured to: perform beam training with a reconfigurable intelligent surface (RIS) mobile terminal (RIS-MT) array, wherein the RIS-MT array is associated with a RIS array; identify, based on the beam training, a first beam for communication with the RIS-MT array; and transmit communication to the RIS array for reflection or refraction to a wireless device using a second beam based, at least in part, on the first beam identified for the RIS-MT array.
  2. 2. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: obtain, from a network entity, at least one RIS codebook comprising at least one RIS configuration for the RIS array; and transmit, for the RIS-MT array, at least one identifier for the at least one RIS codebook, at least one index of the at least one RIS configuration, and a time-hopping schedule for the at least one RIS configuration for the RIS array comprised in the at least one RIS codebook, wherein to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam, the at least one processor, individually or in any combination, is configured to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam further based on the at least one identifier for the at least one RIS codebook, the at least one index of the at least one RIS configuration, and the timehopping schedule.
  3. 3. The apparatus of claim 2, wherein the network entity is one of the first network node, a second network node, a core network entity, a centralized unit (CU), or an operations, administration, and maintenance (OAM) entity.
  4. 4. The apparatus of claim 2, wherein the at least one RIS configuration indicates a plurality of reflection directions or refraction directions or incident directions.
  5. 5. The apparatus of claim 2, wherein the at least one RIS configuration comprises at least one multiple lobe RIS configuration.
  6. 6. The apparatus of claim 2, wherein the at least one processor, individually or in any combination, is further configured to: determine the at least one index of the at least one RIS configuration, wherein to transmit the at least one index of the at least one RIS configuration, the at least one processor, individually or in any combination, is configured to transmit the at least one index of the at least one RIS configuration based on the determination.
  7. 7. The apparatus of claim 2, wherein the at least one processor, individually or in any combination, is further configured to: receive, from the network entity or the RIS-MT array, an indication of the at least one index of the at least one RIS configuration, wherein to transmit the at least one index of the at least one RIS configuration, the at least one processor, individually or in any combination, is configured to transmit the at least one index of the at least one RIS configuration based on the indication of the at least one index of the at least one RIS configuration.
  8. 8. The apparatus of claim 1, wherein the at least one processor is further configured to: obtain, from a network entity, (1) an indication of a third beam associated with communication between a second network node and the RIS-MT array and (2) translation information for changing the third beam for communication between the first network node and RIS-MT array or between the first network node and RIS array, wherein to transmit the communication to the RIS array, the at least one processor, individually or in any combination, is configured to translate the third beam to the second beam based on the translation information.
  9. 9. The apparatus of claim 1, wherein the second beam for the communication to the RIS array is based on the first beam identified for the RIS-MT array and translation information for the RIS array relative to the RIS-MT array, and wherein the first beam is associated with a first frequency and the second beam is associated with a second frequency due to the translation information.
  10. 10. The apparatus of claim 1, wherein the at least one processor is further configured to: transmit first reference symbols to the RIS array for the reflection to a second network node; and receive a measurement report of the first reference symbols from the second network node, wherein to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam, the at least one processor, individually or in any combination, is configured to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam further based on the measurement report of the first reference symbols.
  11. 11. The apparatus of claim 10, wherein to transmit the first reference symbols, the at least one processor, individually or in any combination, is configured to transmit the first reference symbols over multiple time-frequency resources.
  12. 12. The apparatus of claim 11, wherein the first reference symbols are frequency division multiplexed over multiple beams, wherein the measurement report further comprises time-frequency identifiers and measured signal strengths for the multiple beams, and wherein to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam, the at least one processor, individually or in any combination, is configured to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam based on the time-frequency identifiers and the measured signal strengths.
  13. 13. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: receive first reference symbols over multiple time-frequency resources, wherein the first reference symbols are reflected or refracted to the first network node by the RIS array from a second network node; and measure the first reference symbols, wherein to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam, the at least one processor, individually or in any combination, is configured to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam further based on the measured first reference symbols.
  14. 14. The apparatus of claim 13, wherein the at least one processor, individually or in any combination, is further configured to: provide the second network node with a configuration for the multiple timefrequency resources, wherein to receive the first reference symbols, the at least one processor, individually or in any combination, is configured to receive the first reference symbols based on the configuration.
  15. 15. The apparatus of claim 13, wherein the at least one processor, individually or in any combination, is further configured to: transmit, for the second network node, at least one of: a first indication that the multiple time-frequency resources are to be modified, a second indication that attributes of a beam associated with the first reference symbols are to be modified, or a third indication that a transmit power level of the beam is to be modified.
  16. 16. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: transmit, for the RIS array, first reference symbols over multiple time-frequency resources; and measure a first reflection of the first reference symbols, wherein to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam, the at least one processor, individually or in any combination, is configured to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam further based on the measured first reflection of the first reference symbols.
  17. 17. The apparatus of claim 16, wherein to measure the reflection of the first reference symbols, the at least one processor, individually or in any combination, is configured to measure the reflection of the first reference symbols via a full-duplex operation.
  18. 18. The apparatus of claim 16, wherein the at least one processor, individually or in any combination, is further configured to: transmit an indication of a periodicity and an offset that the RIS array is to apply during transmission of the first reference symbols over the multiple time-frequency resources, wherein the reflection of the first reference symbols is based on the indication of the periodicity and the offset, and wherein to measure the first reflection of the first reference symbols, the at least one processor, individually or in any combination, is configured to measure the first reflection of the first reference symbols via a subband full- duplex operation.
  19. 19. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: obtain, from a network entity, (1) at least one RIS codebook comprising at least one RIS configuration associated with a first reflection or a first refraction between a second network node and a third network node with respect to the RIS array and (2) translation information for changing the first reflection or the first refraction to a second reflection or a second refraction between the second network node and the first network node with respect to the RIS array; and transmit, for the RIS array, the at least one RIS codebook and the translation information, wherein to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam, the at least one processor, individually or in any combination, is configured to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam further based on the at least one RIS codebook and the translation information.
  20. 20. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: obtain, from a network entity, at least one RIS codebook comprising at least one of: a first indication of an incident signal direction from the first network node to the RIS array, a second indication of a distance between the first network node and the RIS array, at least one RIS configuration, or a set of reflect or refract angles and distance ranges for the wireless device, wherein to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam, the at least one processor, individually or in any combination, is configured to transmit the communication to the RIS array for the reflection or the refraction to the wireless device using the second beam further based on the first indication, the second indication, the at least one RIS configuration, or the set of reflect or refract angles and the distance ranges.

Description

NETWORK NODE-TO-RIS BEAM REFINEMENT CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit of U.S. Non-Provisional Patent Application Serial No. 18/349,061, entitled “NETWORK NODE-TO-RIS BEAM REFINEMENT” and filed on luly 7, 2023, which is expressly incorporated by reference herein in its entirety. TECHNICAL FIELD [0002] The present disclosure relates generally to communication systems, and more particularly, to wireless communication including reconfigurable intelligent surface (RIS) beam refinement. INTRODUCTION [0003] 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. [0004] 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 (3 GPP) 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 [0005] 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. [0006] In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus for wireless communication at a first network node are provided. The apparatus includes at least one memory and at least one processor coupled to the memory and, based at least in part on information stored in the at least one memory, the at least one processor, individually or in any combination, is configured to cause the first network node to: perform beam training with a reconfigurable intelligent surface (RIS) mobile terminal (RIS-MT) array, where the RIS-MT array is associated with a RIS array, identify, based on the beam training, a first beam for communication with the RIS-MT array; and transmit communication to the RIS array for reflection or refraction to a wireless device using a second beam based, at least in part, on the first beam identified for the RIS-MT array. [0007] To the accomplishment of the foregoing and related ends, the one or more aspects may include 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 [0008] FIG. l is a diagram illustrating an example of a wireless communications system and an access network. [0009] FIG. 2A is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure. [0010] FIG. 2B is a diagram illustrating an example of downlink (DL) channels within a subframe, in accordance with various aspects of the present disclosure. [0011] FIG. 2C is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure. [0012] FIG. 2D is a diagram illustrating an example of uplink (UL) channels within a subframe, in accordance with various aspects of the present disclosure. [0013] FIG. 3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network. [0014] FIG.