Channel state feedback supporting cooperation between multiple RIS nodes

Abstract

For example, an apparatus may be a network node configured to transmit a plurality of reference signals (RSs) from each of a set of antenna ports of the network node in association with a set of reconfigurable smart surfaces (RISs) each including a plurality of panels, where each of the plurality of RSs is associated with a corresponding panel of the plurality of panels; receiving a channel state feedback (CSF) associated with a combined channel for the set of RISs based on the plurality of RSs; and providing an indication of a configuration for each panel based on the CSF. The apparatus may be a wireless device configured to receive a plurality of RSs via a set of RISs; transmitting a CSF based on the plurality of RSs; and receiving a data transmission from a network node via the RIS set based on the CSF.

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to communication systems, and more particularly to communication via multi-beam shaping reconfigurable intelligent surfaces (RIS). BACKGROUND

[0002] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems can 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.

[0003] 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. One example of a 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 can be based on the 4G Long Term Evolution (LTE) standard. 5G NR is SUMMARY

[0004] 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. It is intended to neither identify key or critical elements of all aspects nor delineate 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.

[0005] In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus can be a network node or a component, such as a base station or component, configured to transmit, from each of a set of antenna ports of the network node, a plurality of reference signals in association with a set of configurable reflector element arrays each comprising a plurality of sub-arrays of configurable reflector elements, where each of the plurality of reference signals is associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements. The apparatus can be further configured to receive channel state feedback (CSF) associated with a combined channel for the set of configurable reflector element arrays based on the plurality of reference signals; and provide an indication of a configuration for each of the plurality of sub-arrays based on the CSF.

[0006] In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus can be a wireless device, such as a user equipment (UE) or component, configured to receive, from a network node via a set of configurable reflector element arrays, a plurality of reference signals from each of a set of antenna ports of the network node, the set of configurable reflector element arrays comprising a plurality of sub-arrays of configurable reflector elements, where each of the plurality of reference signals is associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements. The apparatus can be further configured to transmit a CSF associated with a combined channel for the set of configurable reflector element arrays based on the plurality of reference signals; and receive data transmissions from the network node via the set of configurable reflector element arrays based on the CSF.

[0007] In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus can be a configurable reflective element array including a plurality of sub-arrays of configurable reflective elements, such as an RIS or an RIS controller including a plurality of panels, configured to receive, from a network node, a configuration for a beam measurement procedure associated with the configurable reflective element array including the plurality of sub-arrays of configurable reflective elements and at least one additional array of additional configurable reflective elements including an additional plurality of sub-arrays of additional configurable reflective elements, and a plurality of reference signals from each antenna port of a set of antenna ports of the network node, where each reference signal of the plurality of reference signals is associated with a corresponding sub-array of one of the plurality of sub-arrays of configurable reflective elements or the additional plurality of sub-arrays of additional configurable reflective elements. The apparatus can be further configured to reflect, based on the configuration for the beam measurement procedure, a first subset of the plurality of reference signals to a wireless device. The apparatus can additionally be configured to refrain from reflecting, based on the configuration for the beam measurement procedure, a second subset of the plurality of reference signals; and receive, based on the first subset and the second subset of the plurality of reference signals, an indication of a configuration for each of the plurality of sub-arrays for reflecting at least one data transmission from the network node to the wireless device.

[0008] To the accomplishment of the foregoing and related aspects, one or more aspects can include the features recited in the following description and illustrated in the accompanying drawings. The following description and accompanying drawings provide exemplary specifics for practicing one or more aspects. However, these specifics are indicative of but a few of the various ways in which one or more aspects can be practiced. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a diagram illustrating an example of a wireless communications system and an access network.

[0010] Figure 2A is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure.

[0011] Figure 2B is a diagram illustrating an example of a downlink (DL) channel within a subframe, in accordance with various aspects of the present disclosure.

[0012] Figure 2C is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure.

[0013] Figure 2D is a diagram illustrating an example of an uplink (UL) channel within a subframe, in accordance with various aspects of the present disclosure.

[0014] Figure 3 is a diagram illustrating an example of a base station and UE in an access network.

[0015] Figure 4 FIG. 1 is a set of diagrams illustrating communications associated with an obstruction between a base station and a UE without and with a RIS, in accordance with some aspects of the present disclosure.

[0016] Figure 5 Examples in which the RIS includes multiple subsets of RIS elements are illustrated.

[0017] Figure 6 FIG. 2 is a diagram illustrating elements of an optimization problem associated with a multi-panel RIS for reflecting transmissions from a base station to a UE using multiple panels, in accordance with some aspects of the present disclosure.

[0018] Figure 7 FIG. 3 is a set of diagrams illustrating a set of operations associated with an optimization procedure for communications between a base station and a UE via a multi-panel RIS, in accordance with some aspects of the present disclosure.

[0019] Figure 8 FIG. 4 is a diagram illustrating elements of an optimization problem associated with multiple multi-panel RISs for reflecting single-panel transmissions from a base station to a UE around an obstruction, in accordance with some aspects of the present disclosure.

[0020] Figure 9 FIG. 5 is a diagram illustrating elements of an optimization problem associated with multiple multi-panel RISs for reflecting multi-panel transmissions from a base station to a UE around an obstruction, in accordance with some aspects of the present disclosure.

[0021] Figure 10 FIG. 6 is a call flow diagram illustrating a method of optimizing phase matrix configurations for multiple RISs each including multiple panels and configuring the multiple panels based on the determined optimized phase matrix configurations, in accordance with some aspects of the present disclosure.

[0022] Figure 11 FIG. 7 is a flow diagram of a method of wireless communication.

[0023] Figure 12 FIG. 8 is a flow diagram of a method of wireless communication.

[0024] Figure 13 FIG. 9 is a flow diagram of a method of wireless communication.

[0025] Figure 14 FIG. 10 is a flow diagram of a method of wireless communication.

[0026] Figure 15 FIG. 11 is a flow diagram of a method of wireless communication.

[0027] Figure 16 FIG. 12 is a diagram illustrating an example of a hardware implementation for an example apparatus and / or network entity.

[0028] Figure 17 is a diagram illustrating an example of a hardware implementation for an example network entity.

[0029] Figure 18 is a diagram illustrating an example of a hardware implementation for a RIS. DETAILED DESCRIPTION

[0030] In some aspects of wireless communications, a communication path (e.g., a line of sight path) from a base station to a UE can be obstructed. In some aspects, the impact of the obstruction can be avoided or mitigated by using a configurable reflective element array (e.g., a RIS) to reflect a transmitted beam along a path that avoids (or does not include) the obstruction. The RIS can be further subdivided into individually configurable panels that can be used to direct an impinging beam in multiple different directions (e.g., for multiple UEs) or to refine the reflection of an impinging beam in a single direction (e.g., for a single UE). In some aspects, multiple configurable reflective element arrays can each be usable to participate in one of multiple potential communication paths.

[0031] Various aspects generally relate to cooperation between multiple RISs and RIS subarrays and / or RIS panels for communications between a network node and a wireless device (e.g., a UE). Some aspects more specifically relate to a beam measurement procedure for determining a configuration of each panel of multiple (multi-panel) RISs for communications between a network node and a wireless device. In some examples, a network node can transmit a plurality of reference signals from each of a set of antenna ports of the network node in association with a set of configurable reflective element arrays (e.g., multiple RISs), each of which includes a plurality of subarrays of configurable reflective elements (e.g., panels of RISs). In some aspects, each of the plurality of reference signals can be associated with a corresponding panel of RISs (e.g., one of a plurality of panels of multiple RISs). In some aspects, the network node can also provide, for the multiple RISs, an additional indication of a state (e.g., an on / off state and / or a phase matrix of each panel in an on state) of the plurality of panels associated with each of the plurality of reference signals. A wireless device can receive (and measure) the plurality of reference signals, generate a CSF associated with a combined channel for the set of configurable reflective element arrays, and transmit the CSF to the network node. The network can receive, from the wireless device, the CSF associated with the combined channel for the set of configurable reflective element arrays and provide, based on the CSF, an indication of a configuration for each of the plurality of panels for subsequent communications between the network node and the base station. The network node can then transmit a data transmission via the multiple RISs based on the configuration for each of the plurality of panels provided and / or indicated by the network node, and the wireless device can receive the data transmission from the network node via the multiple RISs.

[0032] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, by determining an optimized phase matrix configuration for multiple panels of multiple RISs (e.g., determining an optimized panel-specific phase matrix) and configuring the multiple panels based on the determined optimized phase matrix configuration, the described techniques can be used to improve spectral efficiency and associated throughput by configuring the multiple panels of the multiple RISs with panel-specific phase matrices.

[0033] The detailed description set forth below, in connection with the appended drawings, is a description of various configurations and does not represent the only configurations in which the concepts described herein can be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form, in order to avoid obscuring the concepts.

[0034] Several aspects of telecommunication systems are presented with reference to various apparatus and methods. These apparatus and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”). These elements can be implemented with electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0035] By way of example, an element, or any portion of an element, or any combination of elements can be implemented with a “processing system” that includes one or more processors. When implemented in a multi-processor system, the processors can be single-core or multi-core, and thus the terms “processor” and “processor core” are used interchangeably herein. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system can execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination of any of the foregoing. Whether software is implemented in hardware or software depends on the particular application and design constraints imposed on the overall system.

[0036] Accordingly, in one or more example aspects, implementations, and / or use cases, the described features can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

[0037] While aspects, implementations, and / or use cases are described in this application by illustration to some examples, those examples are not intended to limit the scope of aspects, implementations, and / or use cases. Numerous additional aspects, implementations, and / or use cases can be derived from examples that are disclosed in this application, with equivalence to each disclosed feature. It will be understood by those of ordinary skill in the art that various details of the aspects, implementations, and / or use cases can be changed without departing from the scope of the aspects, implementations, and / or use cases. Furthermore, unless otherwise indicated, the aspects, implementations, and / or use cases described in this application can be used in any combination. It will also be appreciated by those of ordinary skill in the art that some features of the aspects, implementations, and / or use cases described in this application can be widely used in combination with some but not other features. In particular, some features of the aspects, implementations, and / or use cases described in this application can be widely used in combination with features of some other aspects, implementations, and / or use cases described in this application. Thus, the scope of the aspects, implementations, and / or use cases described in this application should not be limited to the specific examples described herein, but should be given the full scope potentially consistent with the specialized computer hardware and / or software described herein.

[0038] Deployment of communication systems, such as 5G NR systems, can be arranged in a variety of ways with various components or constituent parts. In a 5G NR system or network, a network node, network entity, mobility element of a network, radio access network (RAN) node, core network node, network element, or network equipment, such as a base station (BS), or one or more units (or one or more components) performing base station functionality, can be implemented in an aggregated or disaggregated architecture. For example, a BS, such as a Node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a transmission reception point (TRP), or a cell, etc., can be implemented as an aggregated base station (also referred to as a standalone BS or a monolithic BS) or a disaggregated base station.

[0039] An aggregated base station can be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node. A disaggregated base station can be configured to utilize a protocol stack that is physically or logically distributed between two or more units, such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs). In some aspects, a CU can be implemented within a RAN node, and one or more DUs can be co-located with the CU or, alternatively, can be geographically or virtually distributed in one or more other RAN nodes. A DU can be implemented to communicate with one or more RUs. Each of the CU, DU, and RU can be implemented as a virtual unit, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0040] Base station operations or network designs can take into account the aggregated nature of base station functionality. For example, a disaggregated base station can be utilized in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (such as a network configuration initiated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also referred to as a cloud radio access network (C-RAN)). Disaggregation can include distributing functionality across two or more units at various physical locations, as well as virtually distributing functionality of at least one unit, which can enable flexibility in network design. The various units of a disaggregated base station or disaggregated RAN architecture can be configured for wired or wireless communication with at least one other unit.

[0041] Figure 1is a diagram 100 illustrating examples of a wireless communication system and access network. The illustrated wireless communication system includes a disaggregated base station architecture. The disaggregated base station architecture can include one or more CUs 110 that can communicate directly with a core network 120 via a backhaul link, or indirectly with the core network 120 through one or more disaggregated base station units, such as a near real-time (near-RT) RAN intelligent controller (RIC) 125 via an E2 link, or a non-real-time (non-RT) RIC 115 associated with a service management and orchestration (SMO) framework 105, or both. The CUs 110 can communicate with one or more DUs 130 via respective midhaul links, such as an Fl interface. The DUs 130 can communicate with one or more RUs 140 via respective front-haul links. The RUs 140 can communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some aspects, the network can include a RIS 103 that can reflect beamforming (or beam focusing) communications between the RUs 140 and the UEs 104 to avoid an obstruction 107 that obstructs a directional beam between the RUs 140 (or associated base stations 102) and the UEs 104. The RIS is one example of the name of a passive array that reflects or refracts communications between the base station and the UE to control the angle of reflection, e.g., without decoding the communications. In other examples, the RIS can be referred to as a metasurface, smart surface, or IRS, and can be related to or incorporate a metamaterial (e.g., tunable, active, passive, or programmable metamaterial). The RIS 103 can be associated with a RIS controller 108. Discovery information, such as RIS capability information and / or positioning information for the RIS 103, can be transmitted by the RIS controller 108 to the UEs 104, e.g., via a sidelink, or to the base station via an uplink. In some implementations, the UEs 104 can be simultaneously served by multiple RUs 140.

[0042] Each of the units (i.e., CU 110, DU 130, RU 140, and near-RT RIC 125, non-RT RIC 115, and SMO framework 105) can include or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communication interfaces of these units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include wired interfaces configured to receive signals from or transmit signals to one or more of the other units over a wired transmission medium. Additionally, the units can include wireless interfaces that can include receivers, transmitters, or transceivers (such as RF transceivers) configured to receive signals from or transmit signals to one or more of the other units over a wireless transmission medium, or both.

[0043] In some aspects, CU 110 can host one or more higher layer control functions. Such control functions can include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), etc. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by CU 110. CU 110 can be configured to handle user plane functionality (i.e., central unit-user plane (CU-UP)), control plane functionality (i.e., central unit-control plane (CU-CP)), or a combination thereof. In some implementations, CU 110 can be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, CU-UP units can communicate bi-directionally with CU-CP units via an interface, such as an El interface. CU 110 can be implemented to communicate with DU 130 as needed for network control and signaling.

[0044] DU 130 can correspond to a logical unit that includes one or more base station functions for controlling operation of one or more RUs 140. In some aspects, DU 130 can host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation, demodulation, etc.) in accordance with a functional split, such as those defined by 3GPP. In some aspects, DU 130 can also host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by DU 130 or with control functions hosted by CU 110.

[0045] Lower layer functionality can be implemented by one or more RUs 140. In some deployments, RUs 140 controlled by a DU 130 can correspond to logical nodes that host RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.) or both based at least in part on a functional split, such as a lower layer functional split. In such an architecture, RUs 140 can be implemented to handle over-the-air (OTA) communications with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control plane and user plane communications with RUs 140 can be controlled by a corresponding DU 130. In some scenarios, this configuration can enable DUs 130 and CUs 110 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0046] The SMO framework 105 can be configured to support RAN deployment and provisioning of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 105 can be configured to support deployment of dedicated physical resources for RAN coverage requirements, which can be managed via an operations and maintenance interface, such as an Ol interface. For virtualized network elements, the SMO framework 105 can be configured to interact with a cloud computing platform, such as an Open Cloud (O-Cloud) 190 to perform network element lifecycle management, such as to instantiate a virtualized network element, via a cloud computing platform interface, such as an 02 interface. Such virtualized network elements can include, but are not limited to, CUs 110, DUs 130, RUs 140, and near-RT RICs 125. In some implementations, the SMO framework 105 can communicate with hardware aspects of a 4G RAN, such as an Open eNB (O-eNB) 111, via an Ol interface. Additionally, in some implementations, the SMO framework 105 can communicate directly with one or more RUs 140 via an Ol interface. The SMO framework 105 can also include a non-RT RIC 115 configured to support functionality of the SMO framework 105.

[0047] The non-RT RIC 115 can be configured to include logical functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence (AI) / machine learning (ML) (AI / ML) workflows including model training and updating, or policy-based steering of applications / features in the near-RT RIC 125. The non-RT RIC 115 can be coupled to, or in communication with, the near-RT RIC 125, such as via an Al interface. The near-RT RIC 125 can be configured to include logical functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions via an interface, such as via an E2 interface, that connects one or more CUs 110, one or more DUs 130, or both, and an O-eNB with the near-RT RIC 125.

[0048] In some implementations, to generate AI / ML models to be deployed in the near-RT RIC 125, the non-RT RIC 115 can receive parameters or external enrichment information from an external server. Such information can be utilized by the near-RT RIC 125 and can be received at the SMO framework 105 or the non-RT RIC 115 from non-network data sources or from network functions. In some examples, the non-RT RIC 115 or the near-RT RIC 125 can be configured to tune RAN behavior or performance. For example, the non-RT RIC 115 can monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions via the SMO framework 105, such as via reconfiguration of Ol, or via creation of RAN management policies, such as Al policies.

[0049] At least one of the CUs 110, DUs 130, and RUs 140 can be referred to as a base station 102. Thus, the base station 102 can include one or more of the CU 110, the DU 130, and the RU 140 (each component is indicated with a dashed line to represent that each component can or can not be included in the base station 102). The base station 102 provides wireless access to the core network 120 for the UEs 104. A base station 102 can include a macro cell (high power cellular base station) and / or a small cell (low power cellular base station). Small cells include femtocells, picocells, and microcells. A network that includes both small cells and macro cells can be referred to as a heterogeneous network. A heterogeneous network can also include home evolved node Bs (eNBs) (HeNBs), which can provide service to a restricted group known as a closed subscriber group (CSG). The communication links between the RUs 140 and the UEs 104 can include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a RU 140 and / or downlink (DL) (also referred to as forward link) transmissions from a RU 140 to a UE 104. The communication links can use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication links can be through one or more carriers, and each carrier can be a band of frequency waves having a predetermined Yx MHz x The base station 102 / UE 104 can use spectrum up to Y MHz (e.g., 5MHz, 10MHz, 15MHz, 20MHz, 100MHz, 400MHz, etc.) bandwidth per carrier allocated for use. Carriers can or can not be adjacent to each other. The allocation of carriers can be asymmetric with respect to DL and UL (e.g., more or less carriers can be assigned for DL than for UL). The component carriers can include a primary component carrier and one or more secondary component carriers. A primary component carrier can be referred to as a primary cell (PCell) and a secondary component carrier can be referred to as a secondary cell (SCell).

[0050] Certain UEs 104 can communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 can use the DL / UL WWAN spectrum. The D2D communication link 158 can use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication can be through a variety of wireless D2D communications systems, such as for example, Bluetooth® ™ (Bluetooth is a trademark of Bluetooth Special Interest Group (SIG)) Wi-Fi™ (Wi-Fi is a trademark of the Wi-Fi Alliance), LTE, or NR.

[0051] The wireless communication system may also include a Wi-Fi AP 150, which communicates with the UE 104 (also referred to as a Wi-Fi station (STA)) via a communication link 154, for example, in an unlicensed spectrum such as 5 GHz. When communicating in unlicensed spectrum, the UE 104 / AP 150 may perform a free channel assessment (CCA) to determine whether the channel is available before communication.

[0052] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc., based on frequency / wavelength. In 5G NR, two initial operating bands have been designated as frequency ranges FR1 (410MHz–7.125GHz) and FR2 (24.25GHz–52.6GHz). Although a portion of FR1 is greater than 6GHz, it is generally (interchangeably) referred to as the “sub-6GHz” band in various documents and articles. Similar naming issues sometimes occur with FR2, which is generally (interchangeably) referred to as the “millimeter wave” band in documents and articles, although this is distinct from the Extremely High Frequency (EHF) band (30GHz to 300GHz) designated as a “millimeter wave” band by the International Telecommunication Union (ITU).

[0053] The frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR studies have identified the operating bands used for these mid-band frequencies as the frequency range designation FR3 (7.125 GHz to 24.25 GHz). Bands falling within FR3 can inherit FR1 and / or FR2 characteristics, thus effectively extending the features of FR1 and / or FR2 to mid-band frequencies. Furthermore, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as the frequency range designations FR2-2 (52.6 GHz to 71 GHz), FR4 (71 GHz to 114.25 GHz), and FR5 (114.25 GHz to 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0054] In view of the above, unless otherwise specifically stated, the term "below 6 GHz" as used herein can broadly refer to frequencies less than 6 GHz, within FR1, or including intermediate frequency band frequencies. Furthermore, unless otherwise specifically stated, the term "millimeter wave" as used herein can broadly refer to frequencies that can include intermediate frequency band frequencies, within FR2, FR4, FR2-2 and / or FR5, or within the EHF band.

[0055] The base stations 102 and the UEs 104 can each include multiple antennas (such as antenna elements, antenna panels, and / or antenna arrays) to facilitate beamforming. The base stations 102 can transmit to UEs 104 in one or more transmit directions using beamforming. The UEs 104 can receive from the base stations 102 in one or more receive directions using beamforming. The UEs 104 can also transmit to the base stations 102 in one or more transmit directions using beamforming. The base stations 102 can receive from the UEs 104 in one or more receive directions using beamforming. The base station 102 / UE 104 can perform beam training to determine the best receive and transmit directions for each of the base station 102 / UE 104. The transmit and receive directions for the base station 102 can or can not be the same. The transmit and receive directions for the UE 104 can or can not be the same.

[0056] The base stations 102 can include and / or be referred to as gNBs, NodeBs, eNBs, access points, base transceiver stations, radio base stations, radio transceiver, transceiver functions, basic service sets (BSSs), extended service sets (ESSs), TRPs, network nodes, network entities, network equipment, or some other suitable terminology. The base stations 102 can be implemented as integrated access and backhaul (IAB) nodes, relay nodes, sidelink nodes, aggregated (monolithic) base stations with baseband units (BBUs) including CUs and DUs and RUs, or as disaggregated base stations including one or more of CUs, DUs, and / or RUs. A collection of base stations that can include disaggregated and / or aggregated base stations can be referred to as a next generation (NG) RAN (NG-RAN).

[0057] The core network 120 can include an access and mobility management function (AMF) 161, a session management function (SMF) 162, a user plane function (UPF) 163, a unified data management (UDM) 164, one or more location servers 168, and other functional entities. The AMF 161 is a control node that handles signaling between the UEs 104 and the core network 120. The AMF 161 supports registration management, connection management, mobility management, and other functions. The SMF 162 supports session management and other functions. The UPF 163 supports packet routing, packet forwarding, and other functions. The UDM 164 supports generation of authentication and key agreement (AKA) credentials, user identification handling, access authorization, and subscription management. The one or more location servers 168 are illustrated as including a gateway mobile location center (GMLC) 165 and a location management function (LMF) 166. However, in general, the one or more location servers 168 can include one or more location / determination servers, which can include one or more of a GMLC 165, an LMF 166, a positioning determination entity (PDE), a serving mobile location center (SMLC), a mobile positioning center (MPC), and the like. The GMLC 165 and the LMF 166 support UE location services. The GMLC 165 provides an interface for clients / applications (e.g., emergency services) to access UE positioning information. The LMF 166 receives measurements and assistance information from the NG-RAN and the UE 104 via the AMF 161 to compute a position of the UE 104. The NG-RAN can utilize one or more positioning methods to determine a position of the UE 104. Positioning the UE 104 can involve signal measurements, position estimation, and optional velocity calculations based on these measurements. The signal measurements can be made by the UE 104 and / or the base stations 102 serving the UE 104. The measured signals can be based on one or more of a satellite positioning system (SPS) 170 (e.g., Global Navigation Satellite System (GNSS), Global Positioning System (GPS), Non-Terrestrial Network (NTN), or other satellite positioning / location system), LTE signals, Wireless Local Area Network (WLAN) signals, Bluetooth signals, Terrestrial Beacon System (TBS), sensor-based information (e.g., barometric pressure sensors, motion sensors), NR Enhanced Cell ID (NR E-CID) methods, NR signals (e.g., multi-round trip time (multi-RTT), DL angle of departure (DL-AoD), DL time difference of arrival (DL-TDOA), UL time difference of arrival (UL-TDOA), and UL angle of arrival (UL-AoA) positioning), and / or other systems / signals / sensors.

[0058] Examples of UEs 104 include cellular phones, smart phones, session initiation protocol (SIP) phones, laptop computers, personal digital assistants (PDAs), satellite radios, global positioning system, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablet computers, smart devices, wearable devices, vehicles, electric meters, pumps, large or small kitchen appliances, healthcare devices, implants, sensors / actuators, displays, or any other similar functional devices. Some of the UEs 104 can be referred to as IoT devices (e.g., parking meters, gas pumps, toasters, vehicles, heart monitors, etc.). The UEs 104 can also be referred to as stations, mobile stations, subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handheld devices, user agents, mobile clients, clients, or some other suitable terminology. In some scenarios, the term UE can also apply to one or more accessory devices such as in a device constellation arrangement. One or more of these devices can collectively or individually access a network.

[0059] Referring again to Figure 1In certain aspects, the UE 104 can have a RIS coordination component 198 that can be configured to receive, from a network node via a set of configurable reflector element arrays including a plurality of sub-arrays of configurable reflector elements, a plurality of reference signals from each of a set of antenna ports of the network node, where each of the plurality of reference signals is associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements. The RIS coordination component 198 can be further configured to transmit, based on the plurality of reference signals, a CSF associated with a combined channel for the set of configurable reflector element arrays; and receive, based on the CSF, a data transmission from the network node via the set of configurable reflector element arrays. In certain aspects, the base station 102 can have a RIS coordination component 199 that can be configured to transmit, in association with a set of configurable reflector element arrays each including a plurality of sub-arrays of configurable reflector elements, a plurality of reference signals from each of a set of antenna ports of the network node, where each of the plurality of reference signals is associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements. The RIS coordination component 199 can be further configured to receive, based on the plurality of reference signals, a CSF associated with a combined channel for the set of configurable reflector element arrays; and provide, based on the CSF, an indication of a configuration for each of the plurality of sub-arrays. In some aspects, the RIS controller 108 can have a RIS coordination component 197 that can be configured to receive, from a network node, a configuration for a beam measurement procedure associated with a configurable reflector element array including a plurality of sub-arrays of configurable reflector elements and at least one additional array of additional configurable reflector elements including an additional plurality of sub-arrays of additional configurable reflector elements, and a plurality of reference signals from each of a set of antenna ports of the network node, where each of the plurality of reference signals is associated with a corresponding sub-array of one of the plurality of sub-arrays of configurable reflector elements or the additional plurality of sub-arrays of additional configurable reflector elements. The RIS coordination component 197 can be further configured to reflect, based on the configuration for the beam measurement procedure, a first subset of the plurality of reference signals to a wireless device. The RIS coordination component 197 can additionally be configured to refrain from reflecting a second subset of the plurality of reference signals based on the configuration for the beam measurement procedure; and receive, based on the first subset and the second subset of the plurality of reference signals, an indication of a configuration for each of the plurality of sub-arrays for reflecting at least one data transmission from the network node to the wireless device. While the following discussion can focus on wireless communications associated with 5G NR, some aspects can be applicable to other wireless communication technologies.

[0060] Figure 2A FIG. 2 is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure. Figure 2BFIG. 230 is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. Figure 2C FIG. 250 is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure. Figure 2D FIG. 280 is a diagram 280 illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure can be frequency-division duplexed (FDD) in which Figure 2A 、 Figure 2C In the examples provided, the 5G NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (with mostly DL), where D is DL, U is UL, and F is flexible to use between DL / UL, and subframe 3 is configured with slot format 1 (with all UL). While subframes 3, 4 are shown with slot formats 1, 28, respectively, any particular subframe can be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. UEs are configured with a slot format (dynamically through DL control information (DCI) or semi-statically / statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI). Note that the following description also applies for 5G NR frame structures that are TDD.

[0061] Figures 2A-2D A frame structure is illustrated, and aspects of the disclosure can be applicable to other wireless communication technologies that can have different frame structures and / or different channels. One frame (10 ms) can be divided into 10 equally sized subframes (1 ms). Each subframe can include one or more slots. A subframe can also include mini-slots, which can contain 7, 4, or 2 symbols. Each slot can contain 14 or 12 symbols depending on whether a cyclic prefix (CP) is normal or extended. For a normal CP, each slot can contain 14 symbols, and for an extended CP, each slot can contain 12 symbols. A symbol on the DL can be a CP-orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbol. A symbol on the UL can be a CP-OFDM symbol (for high throughput scenarios) or a discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbol (for power limited scenarios; limited to a single stream transmission). The number of slots within a subframe is based on the CP and the numerology. The numerology defines the subcarrier spacing (SCS) (see Table 1). The symbol length / duration scales with the 1 / SCS. Table 1: Parameter sets, SCS, and CP

[0062] For normal CP (14 symbols / slot), different numerologies µ 0 to 4 allow for 1, 2, 4, 8, and 16 slots per subframe, respectively. For extended CP, numerology 2 allows for 4 slots per subframe. Thus, for normal CP and numerology µ, there are 14 symbols / slot and 2 µ slots / subframe. The subcarrier spacing can equal , where is the numerology 0 to 4. Thus, the subcarrier spacing for numerology µ = 0 is 15 kHz, and the subcarrier spacing for numerology µ = 4 is 240 kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A-2D An example is provided of normal CP with 14 symbols per slot and numerology µ = 2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μβ. Within a frame collection, there can be one or more different bandwidth parts (BWPs) (see Figure 2B ) that are frequency division multiplexed. Each BWP can have a particular numerology and CP (normal or extended).

[0063] A resource grid can be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as a physical RB (PRB)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0064] As illustrated in Figure 2A , some of the REs carry reference (pilot) signals (RS) for the UE. The RS can include demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS can also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).

[0065] Figure 2BExamples of various DL channels are illustrated. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including six RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. A PDCCH within one BWP can be referred to as a control resource set (CORESET). A UE is configured to monitor PDCCH search space (e.g., common search space, UE-specific search space) for PDCCH candidates during PDCCH monitoring occasions on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs can be located at higher and / or lower frequencies of the channel bandwidth. A primary synchronization signal (PSS) can be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe / symbol timing and physical layer identity. A secondary synchronization signal (SSS) can be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of DM-RS. The physical broadcast channel (PBCH), which carries a master information block (MIB), can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as SS block (SSB)). The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information (such as system information blocks (SIBs)), and paging messages.

[0066] As Figure 2C illustrated, some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE can transmit DM-RS for channel estimation at the base station. The UE can transmit DM-RS for the physical uplink control channel (PUCCH) and the physical uplink shared channel (PUSCH). The PUSCH DM-RS can be transmitted in the first one or two symbols of a PUSCH. The PUCCH DM-RS can be transmitted in different configurations depending on whether short or long PUCCH is transmitted and depending on the particular PUCCH format used. The UE can transmit a sounding reference signal (SRS). The SRS can be transmitted in the last symbol(s) of a subframe. The SRS can have a comb- structure, and a UE can transmit an SRS on one of the combs. The SRS can be used by a base station for channel quality estimation to enable frequency-dependent scheduling for the UL.

[0067] Figure 2DExamples of various UL channels within a subframe are illustrated. The PUCCH can be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and hybrid automatic repeat request (HARQ) acknowledgment (ACK) (HARQ-ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACKs and / or negative ACKs (NACKs)). The PUSCH carries data, and can additionally be used to carry buffer status reports (BSRs), power headroom reports (PHRs), and / or UCI.

[0068] Figure 3 FIG. 13 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, Internet Protocol (IP) packets from the core network can be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functionality that includes broadcast of system information (e.g., MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter radio access technology (RAT) mobility, and measurement configuration and reporting. The controller / processor 375 provides PDCP layer functionality including header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions. The controller / processor 375 provides RLC layer functionality including

[0069] In some aspects, the base station 310 can correspond to the base station 102, the RU 140, or the AP 150, and the UE 350 can correspond to the UE 104. In such aspects, communication between the base station and the UE can be provided through the RIS 103, such as is described in connection with FIG. 1. Figure 1 or Figures 4-15The communication can be intelligently reflected, e.g., by the RIS surface 393 of the RIS 103, as described with respect to any of the above. The discovery information, such as RIS capability information and / or location information for the RIS 103, can be transmitted by the controller 108, e.g., via a sidelink.

[0070] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, can include error detection on the transport channels, forward error correction (FEC) coding / decoding of the transport channels, interleaving, rate matching, mapping to physical channels, modulation / demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols can then be split into parallel streams. Each stream can then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and / or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams if multiple antennas are employed. Channel estimates from a channel estimator 374 can be used to determine the beamforming vectors. The channel estimate can be derived from a reference signal and / or channel condition feedback transmitted by the UE 350. Each spatial stream can then be transmitted via a respective transmitter 318Tx on a respective antenna 320. Each transmitter 318Tx can modulate a radio frequency (RF) carrier with a respective spatial stream for transmission.

[0071] At the UE 350, each receiver 354Rx receives a signal through its respective antenna 352. Each receiver 354Rx recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions can be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller / processor 359, which implements layer 3 and layer 2 functionality.

[0072] The controller / processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 can be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the core network. The controller / processor 359 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0073] Similar to the functionality described in connection with the DL transmission by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0074] The TX processor 368 can use the reference signal transmitted from the base station 310 or the channel estimate derived from feedback by the channel estimator 358 to select an appropriate decoding and modulation scheme and facilitate spatial processing. The spatial stream generated by the TX processor 368 can be provided to different antennas 352 via individual transmitters 354Tx. Each transmitter 354Tx can use the corresponding spatial stream to modulate an RF carrier for transmission.

[0075] UL transmission is processed at base station 310 in a manner similar to that described in conjunction with the receiver function at UE 350. Each receiver 318Rx receives signals via its respective antenna 320. Each receiver 318Rx recovers the information modulated onto the RF carrier and provides that information to RX processor 370.

[0076] The controller / processor 375 may be associated with at least one memory 376 storing program code and data. The at least one memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing, packet reassembly, decryption, header decompression, and control signal processing between transport and logical channels to recover IP packets. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operation.

[0077] At least one of the RIS 103 or RIS controller 108 can be configured to perform and Figure 1 The RIS collaborative component 197 integrates various aspects. At least one of the TX processor 368, RX processor 356, and controller / processor 359 can be configured to perform actions related to... Figure 1 The RIS collaborative component 198 integrates various aspects. At least one of the TX processor 316, RX processor 370, and controller / processor 375 can be configured to perform actions related to... Figure 1 The RIS collaborative components 199 combine various aspects.

[0078] Figure 4are a set of diagrams 410 and 420 illustrating communications between a base station 402 and a UE 404 associated with an obstruction 408 without and with a RIS 406, in accordance with some aspects of the present disclosure. In some aspects, the RIS 406 can include a large number of uniformly distributed electrically controllable elements (e.g., elements 405, also referred to as configurable reflecting elements or RIS elements). Each element 405 can have reconfigurable electromagnetic properties, such as a reflection coefficient. Depending on the combination of configuration states of each element 405, the RIS 406 can reflect and modify incident radio waveforms in a controlled manner (e.g., by changing the reflection direction, changing the beam width, etc.). The RIS 406 can act as a near passive device, and the reflection direction can be controlled by the base station. The RIS 406 can reflect impinging waves toward the UE in a direction indicated by the base station.

[0079] A RIS (e.g., RIS 406) can be deployed in a wireless communication system, including cellular systems such as LTE, NR, etc. A RIS can alter the channel in a controlled manner, which can improve channel diversity. The increased diversity can provide robustness to channel blockage / fading, which can be particularly important for mmWave communications. Compared to wireless relay or repeater systems, a RIS can be more cost and energy efficient.

[0080] As Figure 4 illustrated, the base station 402 can control the RIS 406 to extend beam coverage and / or resolve an obstruction (e.g., obstruction 408) between the base station 402 and the UE 404. Diagram 410 illustrates the obstruction 408 blocking a beam 412 received at the UE 404. As illustrated in diagram 420, the base station 402 can transmit a communication for the UE 404 to the RIS 406 using a directional beam 432 (which can be referred to as an impinging beam), to be reflected to the UE 404 by a directional beam 436. The base station 402 can indicate the directional beam 436 to the RIS 406, and the RIS 406 can reflect the impinging wave associated with the directional beam 432 in the direction of the directional beam 436. The RIS 406 can adjust the reflection of the impinging directional beam 432 based on a set of coefficients (e.g., a phase vector or a phase matrix) indicating a set of configuration states (or phases) of the configurable elements of the RIS 406 (e.g., a state / phase of each element 405). In some aspects, the phase matrix may be associated with a time delay of a phase shift (e.g., introducing a phase shift between 0 and or between and introduced by each configurable reflecting element of the RIS 406.

[0081] Figure 5Figure 500 illustrates an example in which RIS 506 includes multiple different subsets 512 of multiple RIS elements 518. As illustrated, the different subsets 512 of RIS elements 518 may serve different UEs 504. Therefore, the different subsets 512 of multiple RIS elements 518 may be configured differently to adjust the reflection direction, beamwidth, or other characteristics of the impact wave 508, and in some respects may each be considered a separate / independent RIS. The RIS elements 518 may be controlled by a controller 525 at RIS 506 (including, for example,...). Figure 1 The illustrated RIS cooperative component 197 is controlled based on control information received from base station 502. (As in conjunction with...) Figure 4 As described, base station 502 can indicate beam direction (e.g., any one of beam direction 510a, beam direction 510b, beam direction 510c, beam direction 510d, beam direction 510e, or beam direction 510f) to RIS 506 for reflecting beamforming communications received as impact wave 508 to a specific UE in different UEs 504 in a particular direction. RIS can similarly be controlled by the UE to reflect communications from the UE to the base station and / or to another UE.

[0082] like Figure 4 As illustrated and further discussed below, in some aspects, multiple different subsets 512 of the plurality of RIS elements 518 may be configured differently to adjust the reflection direction, beamwidth, or other characteristics of the impact wave 508 for a single target device (e.g., UE 404 or a specific UE among different UEs 504). In some aspects, the different configurations may be associated with a reference configuration (e.g., subset and / or subarray phase matrices) and one or more phase offset matrices (e.g., phase offset matrices for each subarray) to improve the characteristics of the reflected beam (e.g., directional beam 436 or a combination of directional beams along one of the beam directions 510a to 510f).

[0083] Figure 6 This is a diagram 600 illustrating elements of an optimization problem associated with a multi-panel RIS 606 for transmitting data reflected from base station 602 to UE 604 using multiple panels (e.g., panel 616) according to some aspects of this disclosure. For example, the signal " The transmission of (e.g., data to be transmitted and / or conveyed to UE 604) Matrices and / or vectors can be used to apply pre-decoded matrices. (For example, by Matrix representation, where This refers to the number of antennas used to transmit signals. (Signal) It can be transmitted by base station 602 and may undergo transmission via matrix " "(For example, matrix, where is the channel represented by the matrix is the number of configurable reflecting elements associated with the multi-panel RIS 606 for reflecting the transmitted signal may be decomposed into associated submatrices (e.g., corresponding to subchannels , where is the number of panels of the multi-panel RIS 606, and each submatrix is matrix, where is equal to (e.g., the number of configurable reflecting elements associated with each panel of the multi-panel RIS 606, assuming an equal distribution of configurable reflecting elements among different panels).

[0084] At the multi-panel RIS 606, the reflection can modify the transmitted signal (e.g., the impinging signal) by applying a phase matrix (e.g., the phase matrix “ ” to reflect the transmitted signal. The phase matrix may be decomposed into associated (e.g., diagonal) submatrices (e.g., corresponding to individual panels), which in some aspects can be equal to ) or ), where , where is the -tuple phase vector for the th panel, which can be selected from a codebook (and which can be optimized by applying a scalar value to each element of the phase vector). Each of the reflected transmissions can then be subject to a channel between the multi-panel RIS 606 and the UE 604 represented by the matrix (e.g., matrix, where is the number of antennas at the UE 604 for receiving the transmitted signal. With respect to the matrix , the matrix may be decomposed into associated submatrices (e.g., corresponding to subchannels between a particular panel (e.g., panel 616) of the multi-panel RIS 606 and the UE 604, and each submatrix is a matrix.

[0085] ​Direct transmissions from base station 602 to UE 604 can also be received and undergo transmissions from... matrix The channel is represented. Therefore, it is used to optimize the phase matrix. (or submatrix) or The optimization problem can then be specified under the assumption of single-valued decomposition (SVD) pre-decoding at base station 602, so that the Frobenius norm (e.g., Maximize. For a given set of phase vectors per panel (e.g., The optimization problem can be reformulated as making Maximize, where and In some respects, It can be equal to (For example, (composite channel matrix) It can be equal to (e.g., direct channel matrix) of (tuple vectorization form) and Then, iterative algorithms can be used to compute or converge to an optimized (e.g., near-optimal) set of per-panel phase values ​​or phase matrices.

[0086] Figure 7 These are a set of diagrams (e.g., diagrams 710, 720, 730, 740, and 750) illustrating a set of operations associated with an optimization process for communication between base station 702 and UE 704 via a multi-panel RIS 706, according to some aspects of this disclosure. For example, in some aspects, base station 702 may configure the multi-panel RIS 706 to transmit with a direct channel (and associated matrix) When the first RS associated with the multi-panel RIS 706 is used, all panels 716 are in an off (e.g., non-reflective) state. Additionally, as illustrated in Figures 720 to 750, base station 702 can further configure the multi-panel RIS 706 to associate individual panels with a corresponding RS set, such that they are in an on (e.g., reflective) state. For example, each of Figures 720 to 750 illustrates that for a corresponding RS set, one RIS panel (e.g., RIS panel 716 in Figure 730) is in an on state, while the other panels remain off. Based on the RS transmitted when the multi-panel RIS 706 is in a specific state (e.g., {on, off, off, off}, ..., {off, off, off, on}), the UE can measure the RS associated with a specific channel (e.g., the RS that can be measured and used for calculation). (in )of (Associated values). Based on measurements associated with different configurations of the multi-panel RIS 706 (e.g., different states of the individual panels of the multi-panel RIS 706), the UE can determine optimized channel characteristics for each panel's phase vector or phase matrix and / or combined channels (e.g., the total channel between base station 702 and UE 704, which includes direct channels and a set of channels for the corresponding panels of the multi-panel RIS 706). Based on the determined characteristics, UE 704 can determine one or more of the following associated with optimized operation of the multi-panel RIS 706: the rank of the panel of the multi-panel RIS 706, the pre-decoding matrix (e.g., for application at the base station), and the set of phase vectors or phase matrices, to facilitate communication between base station 702 and UE 704.

[0087] Figure 8 Figure 800 illustrates elements of an optimization problem associated with multiple multi-panel RIS (e.g., RIS 806 and RIS 807) for reflecting single-panel transmissions from base station 802 to UE 804 around obstruction 808, according to some aspects of this disclosure. In the following discussion, for simplicity, it is assumed that both RIS 806 and RIS 807 have the same number of panels (or subarrays of configurable reflective elements) and the same number of configurable reflective elements associated with the entire RIS and each panel and / or subarray. It should be understood that, in some respects, the different RISes can be configured differently. Figure 6 The discussion proceeded in parallel with the signal " The transmission of (e.g., data to be transmitted and / or conveyed to UE 804) (Matrix and / or vector) can be applied to the pre-decoding matrix used for joint transmission. (For example, by Matrix representation, where This refers to the number of antennas used to transmit signals. (Signal) It can be transmitted by base station 802 and may undergo a matrix associated with the first RIS 806. "represents the first channel and the matrix associated with the second RIS 807" The second channel is indicated by " (e.g., where and yes Matrix, and It is related to the signal sent for reflection. The number of configurable reflective elements associated with the RIS 806 and RIS 807. In some respects, this concept can be derived from, for example, the number of configurable reflective elements associated with the RIS 806 and RIS 807. Figure 8 The described use of the two RIS is extended to the use of The use of a set of RIS. Each matrix It can be decomposed into base station 802 and the first RIS's Panel (e.g., where) and The correlation submatrix associated with the channels between (e.g., (corresponding to different paths or sub-channels), where This refers to the number of panels in the RIS array, and each submatrix... yes Matrix, where equal (For example, the number of configurable reflective elements associated with each panel of the RIS, assuming that the configurable reflective elements are evenly distributed across different panels). For example... It can be used with RIS 806 (where The second RIS panel 816 (of which) ) are related, and It can be used with RIS 807 (where The second RIS panel 817 (of which) (related to)

[0088] In the At RIS, reflection can be achieved by applying a phase matrix (e.g., Phase matrix "Modifying the transmitted signal (e.g., by reflecting the transmitted signal)." The phase matrix associated with a specific RIS. It can be decomposed into related ( (Diagonal) submatrix (For example, corresponding to each panel), in some respects, these submatrices can be equal to )or ),in and ,in It is aimed at the first RIS's panel The tuple phase vector, which can be selected from the codebook (and can be obtained by applying a scalar value). (To optimize). Each reflection send in the reflection send may then undergo a process dictated by a matrix. (For example, Matrix, where This refers to the number of antennas used at UE 804 to receive the transmitted signals. The channel between RIS and UE 804. Regarding the matrix. ,matrix may be decomposed into a first RIS associated sub-matrices (e.g., corresponding to sub-channels) associated with the channel (e.g., path or sub-channel) between the panel and the UE 804 where and and each sub-matrix is a matrix. The direct transmission from the base station 802 to the UE 804 can also be received and experience a channel represented by matrix . Thus, the optimization problem for optimizing the phase matrix (or sub-matrices or ) can then be specified under the assumption of SVD precoding at the base station 802 to maximize the Frobenius norm (e.g., ).

[0089] Figure 9 is a diagram 900 illustrating elements of an optimization problem associated with multiple multi-panel RISs (e.g., RIS 906 and RIS 907) for reflecting multi-panel transmissions from a base station 902 around an obstruction 908 to a UE 904 in accordance with some aspects of the present disclosure. In the following discussion, for simplicity, it is assumed that both RIS 906 and RIS 907 have the same number of panels (or sub-arrays of configurable reflecting elements) and the same number of configurable reflecting elements associated with the entire RIS as well as each panel and / or sub-array, it should be understood that in some aspects, different RISs can be configured differently. In contrast to the discussion of Figure 6 , the transmission of the signal “ ” (e.g., a matrix and / or vector associated with data to be transmitted and / or communicated to the UE 904) can apply a precoding matrix “ ” for joint transmission (e.g., represented by a matrix, where is the number of antennas used to transmit the signal). In some aspects, the joint transmission can be a precoding matrix This is one of a coherent joint transmission (CJT) configured to generate in-phase (coherent) signals at a receiving point (such as an antenna used to receive signals at UE 904). In some aspects, the joint transmission can be an incoherent joint transmission (NCJT) in which the signals may be in-phase or out-of-phase at the receiving point. For example, the joint pre-decoding matrix can be associated with a set of directional transmissions (e.g., based on an analog beamformer set) from different antenna ports or sets of antenna ports (each associated with different panels (or sets of panels) comprising multiple physical antennas). Each directional transmission in the set of directional transmissions can be associated with different spatial transmission filter characteristics applied by different panels of the multi-panel antennas of base station 902. 950 (e.g., with and the first panel or panel set (including) (One antenna), the first beam direction 930 and the first RIS 906 associated with the first Pre-decoding matrix Associated with, and with, the second panel or panel set (including) (One antenna), the second beam direction 940, and the second RIS 907 associated with the second Pre-decoding matrix (Associated) can be transmitted by base station 902 and may undergo a matrix associated with the first RIS 906. "represents the first channel and the matrix associated with the second RIS 907" The second channel is indicated by " (e.g., where yes Matrix, and It is related to the signal sent for reflection. (The number of configurable reflective elements associated with RIS 906 and RIS 907). In some respects, based on the directivity of the different components of the joint transmission, the signal received at UE 904 can be primarily based on... and The signal is associated with (e.g., with) and The components of the associated signal can be compared with those based on and (This is related to the much lower received power of the signal). In some respects, this concept can be derived from, for example, regarding... Figure 9 The described use of the two RIS is extended to the use of A collection of RIS (and their respective applications) One of the pre-decoded matrices in a set of pre-decoded matrices The use of (a panel or a set of panels associated with a panel collection). Each matrix It can be decomposed into base station 902 and the first RIS's Panel (e.g., where) and The associated submatrix (e.g., submatrix) of the channels between them. (corresponding to different paths or sub-channels), where This refers to the number of panels in the RIS array, and each submatrix... yes Matrix, where equal (For example, the number of configurable reflective elements associated with each panel of the RIS, assuming that the configurable reflective elements are evenly distributed across different panels). For example... It can be used with RIS 906 (where The second RIS panel 916 (of which) ) are related, and It can be used with RIS 907 (where The second RIS panel 917 (of which) (related to)

[0090] In the At RIS, reflection can be achieved by applying a phase matrix (e.g., Phase matrix "Modifying the transmitted signal (e.g., by reflecting the transmitted signal)." The phase matrix associated with a specific RIS. It can be decomposed into related ( Diagonal submatrices (e.g., corresponding to individual panels) In some respects, these submatrices can be equal to )or ),in and ,in It is aimed at the first RIS's panel The tuple phase vector, which can be selected from the codebook (and can be obtained by applying a scalar value). (To optimize). Each reflection send in the reflection send may then undergo a process dictated by a matrix. (For example, Matrix, where (This refers to the number of antennas used at UE 904 to receive transmitted signals) The channel between RIS and UE 904. Regarding the matrix. ,matrix It can be decomposed into the first RIS's An associated submatrix (e.g., corresponding to the subchannel) of the channel (e.g., path or subchannel) between the panel and the UE 904. ,in and And each submatrix It can be Matrix. Direct transmissions from base station 902 to UE 904 can also be received and undergo transmissions via... matrix The channel represented (where) It can be broken down into targets Components of a pre-decoded matrix ,in ).

[0091] Joint transmission can be applied to Components (e.g., components) The set of channel components for each component in ) (in ) and total channel Related. Therefore, it is used to optimize the phase matrix. (or submatrix) or The optimization problem can then be specified under the assumption of SVD pre-decoding at base station 902 (after decoupling different channel components) to individually maximize the Frobenius norm of each channel component (e.g., based on...). To calculate for each channel component (in Optimization ).

[0092] Figure 10is a call flow diagram 1000 illustrating a method of optimizing phase matrix configurations for a plurality of RISs each comprising a plurality of panels (e.g., determining optimized panel-specific phase matrices) and configuring the plurality of panels based on the determined optimized phase matrix configurations in accordance with some aspects of the present disclosure. For example, the method can be implemented in an environment comprising a base station 1002 (as an example of a network node), a UE 1004 (as an example of a wireless device), a first RIS 1006, and a second RIS 1007, where RIS 1006 and RIS 1007 can be associated with RIS controller 1001 and / or RIS panel 1081 and RIS controller 1003 and / or RIS panel 1083, respectively. In some aspects, base station 1002 can use RIS 1006 and RIS 1007 to communicate with UE 1004 via a set of panels (e.g., by reflecting transmissions from base station 1002 to UE 1004). In the following discussion, it is assumed that all panels of each RIS will participate in the communication between base station 1002 and UE 1004, although in some aspects, a subset of the panels of each RIS can be used instead.

[0093] In some aspects, the functions attributed to base station 1002 can be performed by one or more components of a network entity, network node, or network device (such as the single network entity / node / device or split network entity / node / device described above with respect to Figure 1 In some aspects, the functions attributed to base station 1002 can be performed by one or more components of a network entity, network node, or network device (such as the single network entity / node / device or split network entity / node / device described above with respect to

[0094] In some aspects, the base station 1002 can transmit and the RIS 1006 and the RIS 1007 can each receive one or more of an indication set 1008 of a configuration of a set of RSs and / or a corresponding set of configurations of the RIS 1006 and / or the RIS 1007. In some aspects, the indication set 1008 can indicate a set of time and frequency resources and / or transmit filters (e.g., precoding matrices and / or beams) associated with each RS of the set of RSs. In some aspects, the indication set 1008 can further indicate a RIS configuration for one or more of the RISs (e.g., the RIS 1006 or the RIS 1007) associated with each RS of the set of RSs for measuring channel properties of each channel between the base station 1002 and the UE 1004 via the respective panels. In some aspects, each RIS can receive a subset of the indication set 1008 related to the particular RIS (e.g., an on / off state and / or a set of associated phase matrices or phase values to apply at a particular time).

[0095] For example, the indication set 1008 can indicate that, for a first RS, a first subset of RSs, or a first set of time periods, the corresponding RIS configuration includes turning off a set of panels of the RISs (e.g., the RIS 1006 and the RIS 1007) except for a first panel of a first RIS (e.g., a first panel of the RIS 1006 is in an on or reflective state while other panels of the RIS 1006 and the RIS 1007 are in an off or non-reflective state). The first RS can be measured at the UE 1004 to determine channel properties associated with a channel between the base station 1002 and the UE 1004 via the first panel of the first RIS. Similar RS and RIS configuration indications can be provided in the indication set 1008 for each panel of the set of RISs.

[0096] The base station 1002 can transmit and the UE 1004 can receive an indication 1010 of a configuration of a set of RSs for measurement. In some aspects, the UE 1004 can not receive an indication of RIS configurations associated with the indication 1010. In some aspects, the indication 1010 can include an indication that the set of RSs is associated with an optimization procedure or operation associated with the set of RISs and / or RIS configurations associated with each RS of the set of RSs. In some aspects, the indication 1010 can indicate one or more of a number of RISs and / or RIS panels per RIS, a total number of RIS panels, and / or known or configured RS timing.

[0097] Based on at least one indication of the set of indications 1008, RIS 1006 (e.g., a RIS controller) can configure, at 1012, RIS 1006 (e.g., configurable reflecting elements of panels of RIS 1006) for reflecting (or suppressing reflection of) at most one panel of RSs or a subset of RSs via. Similarly, based on at least one indication of the set of indications 1008, RIS 1007 (e.g., a RIS controller) can configure, at 1014, RIS 1007 (e.g., configurable reflecting elements of panels of RIS 1007) for reflecting (or suppressing reflection of) at most one panel of RSs or a subset of RSs via. For example, configuring RIS 1006 and RIS 1007 at 1012 and 1014, respectively, can include configuring the panels to all be in an off state to measure a direct channel. Additionally, based on indication 1010, UE 1004 can begin monitoring, at 1015, the RSs indicated in indication 1010. In some aspects, each RS discussed below can include multiple RSs (e.g., multiple RSs associated with the same or different precoding matrices and / or sets of panels).

[0098] First RSs 1016 can be transmitted directly from base station 1002 to UE 1004 (e.g., based on configuring RIS 1006 and RIS 1007 at 1012 and 1014, respectively, the panels of RIS 1006 and RIS 1007 are in an off or non-reflecting state). In some aspects, UE 1004 can measure RSs 1016 in association with monitoring the RSs at 1015 to determine direct channel characteristics (e.g., ). For the following discussion, assume that each of RIS 1006 and RIS 1007 includes four panels related to an optimization process or operation, but in other aspects can include more or fewer panels that can employ similar processes to individually measure channel characteristics associated with each panel.

[0099] For a first subset of RSs related to panels of RIS 1006, at a first time 1017, RIS 1006 and RIS 1007 can be reconfigured to be in a first configuration associated with a first panel of RIS 1006 being in an on state and other panels of RIS 1006 and RIS 1007 being in an off state, and RS 1018 can be reflected from base station 1002 to UE 1004. At a second time 1019, RIS 1006 and RIS 1007 can be reconfigured to be in a second configuration associated with a second panel of RIS 1006 being in an on state and other panels of RIS 1006 and RIS 1007 being in an off state, and RS 1020 can be reflected from base station 1002 to UE 1004. At a third time 1021, RIS 1006 and RIS 1007 can be reconfigured to be in a third configuration associated with a third panel of RIS 1006 being in an on state and other panels of RIS 1006 and RIS 1007 being in an off state, and RS 1022 can be reflected from base station 1002 to UE 1004. At a fourth time 1023, RIS 1006 and RIS 1007 can be reconfigured to be in a fourth configuration associated with a fourth panel of RIS 1006 being in an on state and other panels of RIS 1006 and RIS 1007 being in an off state, and RS 1024 can be reflected from base station 1002 to UE 1004. In some aspects, UE 1004 can measure RSs 1018, 1020, 1022, and 1024 in association with monitoring RSs at 1015 to determine channel characteristics associated with each panel of RIS 1006 (e.g., )(e.g., for a first panel of RIS 1006).

[0100] ​For the second subset of RSs related to panels of RIS 1007, at a fifth time 1025, RIS 1006 and RIS 1007 can be reconfigured to be in a fifth configuration associated with a first panel of RIS 1007 being in an on state and other panels of RIS 1006 and RIS 1007 being in an off state, and RS 1026 can be reflected from base station 1002 to UE 1004. At a sixth time 1027, RIS 1006 and RIS 1007 can be reconfigured to be in a sixth configuration associated with a second panel of RIS 1007 being in an on state and other panels of RIS 1006 and RIS 1007 being in an off state, and RS 1028 can be reflected from base station 1002 to UE 1004. At a seventh time 1029, RIS 1006 and RIS 1007 can be reconfigured to be in a seventh configuration associated with a third panel of RIS 1007 being in an on state and other panels of RIS 1006 and RIS 1007 being in an off state, and RS 1030 can be reflected from base station 1002 to UE 1004. At an eighth time 1031, RIS 1006 and RIS 1007 can be reconfigured to be in an eighth configuration associated with a fourth panel of RIS 1007 being in an on state and other panels of RIS 1006 and RIS 1007 being in an off state, and RS 1032 can be reflected from base station 1002 to UE 1004. In some aspects, UE 1004 can measure RSs 1026, 1028, 1030, and 1032 in association with monitoring RSs at 1015 to determine channel characteristics associated with each panel of RIS 1007 (e.g., ) (e.g., for the first panel of RIS 1007). ).

[0101] In some aspects in which a single panel or panel set (e.g., a single antenna port or antenna port set) is used to transmit RSs or data from base station 1002, the first subset of RSs related to panels of RIS 1006 and the second subset of RSs related to panels of RIS 1007 can be associated with a same precoding matrix (e.g., ), as described with respect to Figure 8 . In some aspects associated with joint transmission from multiple panels or panel sets (e.g., multiple antenna ports or antenna port sets) of base station 1002 (e.g., associated with a joint precoding matrix that can be associated with different directional transmissions from different panels or panel sets of base station 1002), in some aspects, the first subset of RSs related to panels of RIS 1006 can be associated with a first precoding matrix (e.g., ) and a first panel or set of panels of the base station 1002, while a second subset of RSs related to the panels of the RIS 1007 can be associated with a second precoding matrix (e.g., ) and a second panel or set of panels of the base station 1002. While Figure 10 While it is exemplified that at most one panel per RS (e.g., per configuration and / or time period) is in an on or reflective state, this can not be the case in some aspects. For example, if a first precoding matrix (e.g., ) has a directionality associated with the RIS 1006 (e.g., associated with a first beam in a direction of the RIS 1006) and a second precoding matrix (e.g., ) has a directionality associated with the RIS 1007 (e.g., associated with a second beam in a direction of the RIS 1007), the RSs associated with each of the first and second precoding matrices can be transmitted by and reflected by the panels of the RIS 1006 and the RIS 1007, respectively, during the same time period (and based on the same configuration indicating an on state of one panel of each of the RIS 1006 and the RIS 1007). In some aspects, this can save time associated with optimizing operations while based on and the amount of interference resulting from “cross reflection” (e.g., and ) can be negligible and / or can be ignored (e.g., based on an assumption that components of signals associated with and can be associated with much lower received power than signals based on and Additionally, for RISs that reflect communications associated with multiple UEs using the same or overlapping set of panels, each panel can be in an on state using a phase matrix associated with a different UE of the multiple UEs such that Figure 10 the off state exemplified in

[0102] At 1034, the UE can determine optimization parameters (e.g., parameters that optimize throughput) for communications between the base station 1002 and the UE 1004 using both the RIS 1006 and the RIS 1007 (e.g., when implementing a RIS cooperation or coordinated RIS mode of operation) and generate a CSF to provide to the base station 1002. In some aspects, determining the optimization parameters at 1034 can include determining based on the measured RSs (as described above with respect to Figure 6and adjust based on the number of RISs, RIS panels, and precoding matrices used (as described with respect to Figure 8 and Figure 9 one or more vectors (e.g., vectorized composite channel matrix and direct channel matrix tuple vectorized form) to optimize phase values (e.g., ). Based on the optimized phase values, in some aspects, the UE 1004 can further determine a precoding matrix (e.g., an RI and / or a PMI) for the base station 1002 and a CQI based on, for example, Figure 8 composite channel matrix illustrated at 1034. In some aspects, each of the phase values can be indicated using a limited number of configurations or known values (e.g., a set of values indicated by a single symbol using QPSK or 8-PSK modulation).

[0103] For example, based on measuring the RSs 1016, 1018, 1020, 1022, 1024, 1026, 1028, 1030, and 1032, the UE 1004 can determine, at 1034, optimization parameters and RIS configurations (RIS panel configurations (e.g., or ) or per-panel phase values (e.g., ) for one or more precoding matrices (e.g., ). The UE 1004 can further generate, at 1034, a set of information for a CSF based on the measurements and the determined optimization parameters. Based on the generated information for the CSF, the UE 1004 can transmit and the base station 1002 can receive (e.g., via the RIS 1006 and / or the RIS 1007) a CSF 1036 that includes the information for the CSF generated at 1034.

[0104] ​In some aspects, based on the CSF 1036, the base station 1002 can generate, at 1038, a set of RIS configurations for a set of RISs (e.g., RIS 1006 and RIS 1007) or RIS panels participating in communications between the base station 1002 and the UE 1004. In some aspects, the RIS configurations generated at 1038 can include one of: (1) a common phase matrix and a set of panel-specific phase value offset values (e.g., indicating a panel-specific difference from or a scalar and / or multiplier to apply to the common phase matrix for the RIS), or (2) a set of panel-specific phase matrices. In some aspects, the phase matrices can be indicated using a known set of phase matrices (e.g., a codebook), which can be related to a particular beam direction or reflection direction, e.g., introducing a known angular offset from a passive reflection or associated with a particular direction and / or shape of a reflective transmission (or beam).

[0105] In some aspects, the base station 1002 can also determine, at 1038, a precoding matrix (for a single panel or multiple panels of the base station 1002) based on the CSF 1036. In some aspects, the precoding matrix determined at 1038 can be used for subsequent transmissions from the base station 1002 to the UE 1004. The base station 1002 can then transmit an RIS configuration of the set of RIS configurations 1040, and one of the RIS 1006 or the RIS 1007 can receive the RIS configuration. The RIS 1006 (e.g., a controller associated with the RIS 1006) can configure, at 1042, RIS panels of the RIS 1006 for subsequent transmissions from the base station 1002 to the UE 1004 based on at least one RIS configuration of the set of RIS configurations 1040. Similarly, the RIS 1007 (e.g., a controller associated with the RIS 1007) can configure, at 1044, RIS panels of the RIS 1007 for subsequent transmissions from the base station 1002 to the UE 1004 based on at least one RIS configuration of the set of RIS configurations 1040.

[0106] In some aspects, the base station 1002 can transmit a set of data transmissions 1046 for reflection from the RIS 1006 and the RIS 1007. As described with respect to FIGS. 10A and 10B, the set of data transmissions 1046 can include a single transmission associated with a single precoding matrix or multiple transmissions associated with multiple precoding matrices from multiple panels of the base station 1002 (e.g., corresponding to multiple RISs). In some aspects, the set of data transmissions 1046 can be reflected from one or more of the RIS 1006 and the RIS 1007 and can be received by the UE 1004. Figure 8 and Figure 9 In some aspects, the base station 1002 can transmit a set of data transmissions 1046 for reflection from the RIS 1006 and the RIS 1007. As described with respect to FIGS. 10A and 10B, the set of data transmissions 1046 can include a single transmission associated with a single precoding matrix or multiple transmissions associated with multiple precoding matrices from multiple panels of the base station 1002 (e.g., corresponding to multiple RISs). In some aspects, the set of data transmissions 1046 can be reflected from one or more of the RIS 1006 and the RIS 1007 and can be received by the UE 1004.

[0107] Figure 11 is a flowchart 1100 of a method of wireless communication. The method can be performed by a base station (e.g., the base station 102, 802, 902, 1002; the network entity 1602, 1702). In some aspects, the base station can provide, for a set of configurable reflector element arrays (e.g., RISs), an indication of a state of a plurality of sub-arrays associated with each of a plurality of reference signals, the set of configurable reflector element arrays each comprising a plurality of sub-arrays (or panels) of configurable reflector elements. In some aspects, the plurality of reference signals can comprise a subset of a plurality of reference signals to be transmitted from each of a set of antenna ports of a network node. In some aspects, each of the plurality of reference signals can be associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements. The state of the sub-arrays indicated by the indication transmitted by the base station can be one of a reflective (on) state or a non-reflective (off) state. Additionally or alternatively, the state of the sub-arrays indicated by the indication transmitted by the base station can be a set of phase values (e.g., a phase vector or a phase matrix) indicating a phase shift and an attenuation applied by each configurable reflector element of the sub-arrays, where an attenuation value of 0 (or 1) can indicate no reflection (e.g., a non-reflective (off) state associated with a maximum attenuation). In some aspects, the indication of the state of the plurality of sub-arrays associated with each of the plurality of reference signals indicates at most one sub-array (or panel) in an on state (e.g., at most one panel will be in an on state for each of the plurality of reference signals). For example, with reference to Figures 8-10 , the base station 1002 (or base station 802 or 902) can transmit an indication set 1008 of a configuration of a set of RSs and / or a corresponding set of configurations of RIS 1006 and / or RIS 1007 associated with the RSs.

[0108] In some aspects, the set of configurable reflector element arrays can comprise two or more configurable reflector element arrays. A first configurable reflector element array (one of the two or more arrays) of the set of configurable reflector element arrays (e.g., RISs) can comprise a first plurality of sub-arrays (or panels). In some aspects, each sub-array of the first plurality of sub-arrays can be configured to reflect a plurality of reference signals associated with the first plurality of sub-arrays from a network node to a wireless device using a same phase matrix associated with a same beam direction (or a same reflection direction). In some aspects, the phase matrix can be the same phase matrix associated with a reflection direction and / or beamforming performed by the panel of the RIS a tuple phase vector (where is a number of configurable reflector elements in the corresponding sub-array). The reflected plurality of reference signals can be associated with reception at a wireless device (e.g., a UE).

[0109] In some aspects, a second configurable reflective element array (e.g., a second array of two or more arrays) in a set of configurable reflective element arrays may include a second plurality of subarrays. In some aspects, at least two of the second plurality of subarrays may be configured to reflect a plurality of reference signals associated with the second plurality of subarrays from the network node to the wireless device using different phase matrices associated with different beam directions. In some aspects, the different phase matrices may be different phase matrices associated with the reflection direction and / or beamforming performed by the panel of the RIS. tuple phase vector (where (This corresponds to the number of configurable reflective elements in the subarray). In some respects, different phase matrices can be based on the same matrix with different offsets or scalar values ​​applied. Tuple phase vector. In some respects, as described above, A tuple phase vector can be associated with a codebook (e.g., a known or configured set of phase vectors, which can be indicated by an index or other indicator that indicates a member in the known or configured set of phase vectors).

[0110] At 1104, the base station can transmit multiple reference signals from each antenna port in the antenna port set of the network node, associated with a configurable array of reflective elements. For example, 1104 can be... Figure 17 The transceiver 1746, antenna 1780, and / or RIS cooperative component 199 are implemented. In some aspects, each of the plurality of reference signals may be associated with a corresponding subarray of a plurality of subarrays of configurable reflective elements. In some aspects, the antenna port set may include a single antenna port and / or panel (as in...). Figure 8 (in the middle) or multiple antenna ports and / or panels (such as in Figure 9 (in Chinese). In some aspects, each reference signal associated with a corresponding subarray of a first configurable reflective element array in the set of configurable reflective element arrays is further associated with a first pre-decoding matrix, and wherein each reference signal associated with a corresponding subarray of a second configurable reflective element array in the set of configurable reflective element arrays is further associated with a second pre-decoding matrix. For example, reference Figures 8-10 Base station 1002 (or base station 802 or 902) may transmit a first subset and a second subset of RS (including RS1018, 1020, 1022, 1024, 1026, 1028, 1030 and 1032, respectively, associated with the configurations implemented at times 1017, 1019, 1021, 1023, 1025, 1027, 1029 and 1031).

[0111] In some aspects, the base station can transmit, from each antenna port of a set of antenna ports of the network node, at least one additional reference signal associated with an off state of each subarray of each configurable reflectron array of the set of configurable reflectron arrays. In some aspects, the set of antenna ports can include a single antenna port and / or panel (as in Figure 8 ) or multiple antenna ports and / or panels (as in Figure 9 ). The additional reference signals can be used to determine channel characteristics of one or more direct channels. For example, referring to Figures 8-10 , the base station 1002 (or base station 802 or 902) can transmit RS 1016.

[0112] At 1108, the base station can receive a CSF associated with a combined channel for the set of configurable reflectron arrays based on the plurality of reference signals. For example, 1108 can be performed by the transceiver 1746, antennas 1780, and / or RIS coordination component 199 of Figure 17 In some aspects, the CSF can include an additional indication of a set of relative phase values (or phase value offsets) associated with a corresponding subset of the plurality of subarrays, the corresponding subset associated with the configurable reflectron array of the set of configurable reflectron arrays. For example, in some aspects, the subset of the plurality of subarrays can include all of the plurality of subarrays. In some aspects, a first subarray of each configurable reflectron array (e.g., each RIS) can be associated with a first set of phase values (e.g., a tuple), and the remaining subarrays can be associated with a corresponding set of relative phase values (or phase value offsets from the first set of phase values). In some aspects, the CSF can include one or more of an RI, a PMI, or a CQI. In some aspects, the CSF further includes an additional RI and an additional PMI associated with a joint transmission (e.g., a related second transmission such as for a CJT or NCJT) from one of a set of antenna ports of the network node or a set of groups of antenna ports corresponding to the set of configurable reflectron arrays. For example, if the plurality of reference signals includes a first set of reference signals associated with a first panel of the base station and a second set of reference signals associated with a second panel of the base station, the CSF can include at least one of a first RI, a first PMI, and a first CQI associated with the first panel of the base station and at least one of a second RI, a second PMI, and a second CQI associated with the second panel of the base station. For example, referring to Figures 8-10 , the base station 1002 (or base station 802 or 902) can receive CSF 1036.

[0113] At 1110, the base station can provide an indication of a configuration for each subarray of the plurality of subarrays based on the CSF. For example, 1110 can be performed by the transceiver 1746, antennas 1780, and / or RIS coordination component 199 of Figure 17CU processor 1712, DU processor 1732, RU processor 1742, transceiver 1746, antenna 1780, and / or RIS coordination component 199 to perform. In some aspects, the configuration can include an indication of a phase matrix to apply at each of the multiple sub-arrays. The indication can include an indication of one or more of a known or configured phase matrix (or phase vector) and a set of scalar or offset values to apply to the known or configured phase matrix. For example, with reference to Figures 8-10 , the base station 1002 (or base station 802 or 902) can provide a set of RIS configurations 1040 indicating a set of phase matrices for panels of the RIS 1006 and the RIS 1007.

[0114] In some aspects, a base station can transmit a data transmission for a wireless device via a set of configurable reflector element arrays using a CSF-based precoding matrix. In some aspects, each configurable reflector element array of the set of configurable reflector element arrays is a RIS, and each sub-array is an independently controllable panel of the RIS of the set of configurable reflector element arrays. In some aspects, the wireless device can be a UE, and the base station can be a network node. For example, with reference to Figures 8-10 , the base station 1002 (or base station 802 or 902) can transmit a set of data transmissions 1046.

[0115] Figure 12 is a flow diagram 1200 of a method of wireless communication. The method can be performed by a base station (e.g., the base station 102, 802, 902, 1002; the network entity 1602, 1702). At 1202, the base station can provide, for a set of configurable reflector element arrays (e.g., RISs) each comprising a plurality of sub-arrays (or panels) of configurable reflector elements, an indication of a state of a plurality of sub-arrays associated with each of a plurality of reference signals. For example, 1202 can be performed by the base station 1002 (or base station 802 or 902) including the RIS coordination component 199, the CU processor 1712, the DU processor 1732, the RU processor 1742, the transceiver 1746, the antenna 1780, and / or the RIS coordination component 199 to perform. Figure 17CU processor 1712, DU processor 1732, RU processor 1742, transceiver 1746, antenna 1780, and / or RIS coordination component 199. In some aspects, the plurality of reference signals can include a subset of the plurality of reference signals to be transmitted from each antenna port of the set of antenna ports of the network node. In some aspects, each reference signal of the plurality of reference signals can be associated with a corresponding subarray of the plurality of subarrays of configurable reflecting elements. The indication of the state of the indicated subarray transmitted by the base station at 1202 can be one of a reflecting (on) state or a non-reflecting (off) state. Additionally or alternatively, the indication of the state of the indicated subarray transmitted by the base station can be a set of phase values (e.g., a phase vector or a phase matrix) indicating a phase shift and an attenuation applied by each configurable reflecting element of the subarray, where an attenuation value of 0 (or 1) can indicate no reflection (e.g., a non-reflecting (off) state associated with a maximum attenuation). In some aspects, the indication of the state of the plurality of subarrays associated with each reference signal of the plurality of reference signals indicates at most one subarray (or panel) in an on state (e.g., at most one panel will be in an on state for each reference signal of the plurality of reference signals). For example, referring to Figures 8-10 The base station 1002 (or base station 802 or 902) can transmit an indication set 1008 of a configuration of a set of RSs and / or a corresponding configuration set of RISs 1006 and / or RISs 1007 associated with the RSs.

[0116] In some aspects, the set of configurable reflecting element arrays can include two or more configurable reflecting element arrays. A first configurable reflecting element array (one of the two or more arrays) of the set of configurable reflecting element arrays (e.g., RISs) can include a first plurality of subarrays (or panels). In some aspects, each subarray of the first plurality of subarrays can be configured to reflect a plurality of reference signals associated with the first plurality of subarrays from the network node to a wireless device using a same phase matrix associated with a same beam direction (or a same reflecting direction). In some aspects, the phase matrix can be the same tuple phase vector (where is a number of configurable reflecting elements in the corresponding subarray). The reflected plurality of reference signals can be associated with reception at a wireless device (e.g., a UE).

[0117] In some aspects, a second configurable reflective element array (e.g., a second array of two or more arrays) in a set of configurable reflective element arrays may include a second plurality of subarrays. In some aspects, at least two of the second plurality of subarrays may be configured to reflect a plurality of reference signals associated with the second plurality of subarrays from the network node to the wireless device using different phase matrices associated with different beam directions. In some aspects, the different phase matrices may be different phase matrices associated with the reflection direction and / or beamforming performed by the panel of the RIS. tuple phase vector (where (This corresponds to the number of configurable reflective elements in the subarray). In some respects, different phase matrices can be based on the same matrix with different offsets or scalar values ​​applied. Tuple phase vector. In some respects, as described above, A tuple phase vector can be associated with a codebook (e.g., a known or configured set of phase vectors, which can be indicated by an index or other indicator that indicates a member in the known or configured set of phase vectors).

[0118] At 1204, the base station can transmit multiple reference signals from each antenna port in the antenna port set of the network node, associated with a configurable array of reflective elements. For example, 1204 can be... Figure 17 The transceiver 1746, antenna 1780, and / or RIS cooperative component 199 are implemented. In some aspects, each of the plurality of reference signals may be associated with a corresponding subarray of a plurality of subarrays of configurable reflective elements. In some aspects, the antenna port set may include a single antenna port and / or panel (as in...). Figure 8 (in the middle) or multiple antenna ports and / or panels (such as in Figure 9 (in Chinese). In some aspects, each reference signal associated with a corresponding subarray of a first configurable reflective element array in the set of configurable reflective element arrays is further associated with a first pre-decoding matrix, and wherein each reference signal associated with a corresponding subarray of a second configurable reflective element array in the set of configurable reflective element arrays is further associated with a second pre-decoding matrix. For example, reference Figures 8-10 Base station 1002 (or base station 802 or 902) may transmit a first subset and a second subset of RS (including RS1018, 1020, 1022, 1024, 1026, 1028, 1030 and 1032, respectively, associated with the configurations implemented at times 1017, 1019, 1021, 1023, 1025, 1027, 1029 and 1031).

[0119] At 1206, the base station can transmit at least one additional reference signal from each antenna port in the antenna port set of the network node, associated with the off state of each subarray in each configurable reflective element array in the configurable reflective element array set. For example, 1206 can be generated by... Figure 17 The transceiver 1746, antenna 1780, and / or RIS collaboration component 199 are implemented. In some aspects, the antenna port set may include a single antenna port and / or a panel (such as in...). Figure 8 (in the middle) or multiple antenna ports and / or panels (such as in Figure 9 (In the middle). An additional reference signal can be used to determine the channel characteristics of one or more direct channels. For example, a reference... Figures 8-10 Base station 1002 (or base station 802 or 902) can send RS 1016.

[0120] At 1208, the base station can receive the CSF associated with the combined channel for a set of configurable reflective element arrays based on multiple reference signals. For example, 1208 can be... Figure 17 The transceiver 1746, antenna 1780, and / or RIS cooperative component 199 perform this. In some aspects, the CSF may include additional indication of a set of relative phase values ​​associated with a corresponding subset of the plurality of subarrays, the corresponding subset being associated with a configurable reflective element array in a set of configurable reflective element arrays. For example, in some aspects, a subset of the plurality of subarrays may include all subarrays in the plurality of subarrays. In some aspects, a first subarray of each configurable reflective element array (e.g., each RIS) may be associated with a first set of phase values ​​(e.g., ... The CSF may be associated with a tuple, while the remaining subarrays may be associated with a corresponding set of relative phase values. In some aspects, the CSF may include one or more of RI, PMI, or CQI. In some aspects, the CSF may also include additional RI and additional PMI associated with joint transmission (e.g., associated second transmission) from a set of antenna ports from a network node or a set of antenna port groups corresponding to a set of configurable reflective element arrays. For example, if the plurality of reference signals includes a first set of reference signals associated with a first panel of the base station and a second set of reference signals associated with a second panel of the base station, the CSF may include at least one of a first RI, a first PMI, and a first CQI associated with the first panel of the base station and at least one of a second RI, a second PMI, and a second CQI associated with the second panel of the base station. For example, reference Figures 8-10 Base station 1002 (or base station 802 or 902) can receive CSF 1036.

[0121] At 1210, the base station can provide instructions on the configuration for each of the multiple subarrays based on the CSF. For example, 1210 can be provided by... Figure 17The CU processor 1712, DU processor 1732, RU processor 1742, transceiver 1746, antenna 1780, and / or RIS cooperative component 199 execute this. In some aspects, the configuration may include an indication of the phase matrix to be applied at each of the multiple subarrays. The indication may include an indication of one or more of a known or configured phase matrix (or phase vector) and a set of scalar or offset values ​​applied to the known or configured phase matrix. For example, refer to... Figures 8-10 Base station 1002 (or base station 802 or 902) can provide a RIS configuration set 1040 indicating the set of phase matrices for the panels of RIS 1006 and RIS 1007.

[0122] At 1212, the base station can use a CSF-based pre-decoding matrix to transmit data to the wireless device via a configurable array of reflective elements. For example, 1212 can be... Figure 17 The transceiver 1746, antenna 1780, and / or RIS cooperative component 199 are implemented. In some aspects, each configurable reflective element array in the set of configurable reflective element arrays is a RIS, and each subarray is an independently controllable panel of the RIS in the set of configurable reflective element arrays. In some aspects, the wireless device may be a UE, and the base station may be a network node. For example, refer to... Figures 8-10 Base station 1002 (or base station 802 or 902) can send data transmission set 1046.

[0123] Figure 13is a flowchart 1300 of a method of wireless communication. The method can be performed by a UE (e.g., the UE 104, 804, 904, 1004; the apparatus 1604) as an example of a wireless device. In some aspects, the UE can receive, in association with a set of configurable reflector element arrays (e.g., RISs), an indication of a state of a plurality of sub-arrays associated with each of a plurality of reference signals, the set of configurable reflector element arrays each comprising a plurality of sub-arrays (or panels) of configurable reflector elements. In some aspects, the plurality of reference signals can comprise a subset of the plurality of reference signals to be received from each of a set of antenna ports of a network node. In some aspects, each of the plurality of reference signals can be associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements. The state of the sub-arrays indicated by the indication received by the UE can be one of a reflective (on) state or a non-reflective (off) state. Additionally or alternatively, the state of the sub-arrays indicated by the indication received by the UE can be a set of phase values (or a phase matrix) indicating a phase shift and an attenuation applied by each configurable reflector element of the sub-arrays, where an attenuation value of 0 (or 1) can indicate no reflection (e.g., a non-reflective (off) state associated with a maximum attenuation). In some aspects, the indication of the state of the plurality of sub-arrays associated with each of the plurality of reference signals indicates at most one sub-array (or panel) in an on state (e.g., at most one panel will be in an on state for each of the plurality of reference signals). For example, with reference to Figures 8-10 The UE 1004 (or the UE 804 or 904) can receive an indication 1010 of a configuration of a set of RSs for measurement, where the indication 1010 can include an indication that the set of RSs is associated with an optimization process or operation associated with a set of RISs (e.g., RIS 1006 and RIS 1007) and / or an RIS configuration associated with each RS in the set of RSs.

[0124] In some aspects, the set of configurable reflector element arrays can include two or more configurable reflector element arrays. A first configurable reflector element array (one of the two or more arrays) of the set of configurable reflector element arrays (e.g., RISs) can include a first plurality of sub-arrays (or panels). In some aspects, each sub-array of the first plurality of sub-arrays can be configured to reflect a plurality of reference signals associated with the first plurality of sub-arrays from a network node to a UE using a same phase matrix associated with a same beam direction (or a same reflection direction). In some aspects, the phase matrix can be the same phase matrix associated with a reflection direction and / or beamforming performed by the panel of the RIS. In some aspects, the phase matrix can be a different phase matrix for each sub-array of the first plurality of sub-arrays. In some aspects, the set of configurable reflector element arrays can include two or more configurable reflector element arrays. A first configurable reflector element array (one of the two or more arrays) of the set of configurable reflector element arrays (e.g., RISs) can include a first plurality of sub-arrays (or panels). In some aspects, each sub-array of the first plurality of sub-arrays can be configured to reflect a plurality of reference signals associated with the first plurality of sub-arrays from a network node to a UE using a same phase matrix associated with a same beam direction (or a same reflection direction). In some aspects, the phase matrix can be the same phase matrix associated with a reflection direction and / or beamforming performed by the panel of the RIS. In some aspects, the phase matrix can be a different phase matrix for each sub-array of the first plurality of sub-arrays. (This refers to the number of configurable reflective elements in the corresponding subarray). The multiple reflected reference signals can be associated with reception at a wireless device (e.g., UE).

[0125] In some aspects, a second configurable reflective element array (e.g., a second array of two or more arrays) in a set of configurable reflective element arrays may include a second plurality of subarrays. In some aspects, at least two of the second plurality of subarrays may be configured to reflect a plurality of reference signals associated with the second plurality of subarrays from the network node to the UE using different phase matrices associated with different beam directions. In some aspects, the different phase matrices may be different phase matrices associated with the reflection direction and / or beamforming performed by the panel of the RIS. tuple phase vector (where (This corresponds to the number of configurable reflective elements in the subarray). In some respects, different phase matrices can be based on the same matrix with different offsets or scalar values ​​applied. Tuple phase vector. In some respects, as described above, A tuple phase vector can be associated with a codebook (e.g., a known or configured set of phase vectors, which can be indicated by an index or other indicator that indicates a member in the known or configured set of phase vectors).

[0126] At 1304, the UE can receive multiple reference signals from each antenna port in the network node's antenna port set via a set of configurable reflective element arrays including multiple subarrays of configurable reflective elements. For example, 1304 can be... Figure 16 The transceiver 1622, antenna 1680, and / or RIS cooperative component 198 are implemented. In some aspects, each of the plurality of reference signals may be associated with a corresponding subarray of a plurality of subarrays of configurable reflective elements. In some aspects, the antenna port set may include a single antenna port and / or panel (as in...). Figure 8 (in the middle) or multiple antenna ports and / or panels (such as in Figure 9 (in Chinese). In some aspects, each reference signal associated with a corresponding subarray of a first configurable reflective element array in the set of configurable reflective element arrays is further associated with a first pre-decoding matrix, and wherein each reference signal associated with a corresponding subarray of a second configurable reflective element array in the set of configurable reflective element arrays is further associated with a second pre-decoding matrix. For example, reference Figures 8-10UE 1004 (or UE 804 or 904) can receive a first subset and a second subset of RS (including RS 1018, 1020, 1022, 1024, 1026, 1028, 1030 and 1032, respectively, associated with the configurations implemented at times 1017, 1019, 1021, 1023, 1025, 1027, 1029 and 1031).

[0127] In some aspects, the UE can receive from each antenna port in the antenna port set of the network node at least one additional reference signal associated with the off state of each subarray in each configurable reflective element array in the configurable reflective element array set. In some aspects, the antenna port set may include a single antenna port and / or a panel (such as in...) Figure 8 (in the middle) or multiple antenna ports and / or panels (such as in Figure 9 (In the middle). An additional reference signal can be used to determine the channel characteristics of one or more direct channels. For example, a reference... Figures 8-10 UE 1004 (or UE 804 or 904) can receive RS 1016.

[0128] In some aspects, the UE can determine the CSF associated with the combined channel based on multiple reference signals and indications of the states of multiple subarrays associated with each of the multiple reference signals. In some aspects, determining the CSF can be based on multiple reference signals received at 1304. In some aspects, multiple reference signals can be used to determine the CSF, such as regarding... Figures 8-10 As described. For example, see reference. Figures 8-10 UE 1004 (or UE 804 or 904) may use both RIS 1006 and RIS 1007 at 1034 (e.g., when implementing RIS cooperation or cooperative RIS operation mode) to determine optimization parameters (e.g., parameters for optimizing throughput) for communication between base station 1002 and UE 1004, and generate CSF to provide to base station 1002.

[0129] At 1308, the UE can transmit a CSF associated with a combined channel for a set of configurable reflective element arrays based on multiple reference signals. For example, 1308 can be... Figure 16 The transceiver 1622, antenna 1680, and / or RIS cooperative component 198 perform this. In some aspects, the CSF may include additional indication of a set of relative phase values ​​associated with a corresponding subset of the plurality of subarrays, the corresponding subset being associated with a configurable reflective element array in a set of configurable reflective element arrays. For example, in some aspects, a subset of the plurality of subarrays may include all subarrays in the plurality of subarrays. In some aspects, a first subarray of each configurable reflective element array (e.g., each RIS) may be associated with a first set of phase values ​​(e.g., ... The CSF may be associated with a tuple, while the remaining subarrays may be associated with a corresponding set of relative phase values. In some aspects, the CSF may include one or more of RI, PMI, or CQI. In some aspects, the CSF may also include additional RI and additional PMI associated with joint transmission (e.g., associated second transmission) from a set of antenna ports from a network node or a set of antenna port groups corresponding to a set of configurable reflective element arrays. For example, if the plurality of reference signals includes a first set of reference signals associated with a first panel of the base station and a second set of reference signals associated with a second panel of the base station, the CSF may include at least one of a first RI, a first PMI, and a first CQI associated with the first panel of the base station and at least one of a second RI, a second PMI, and a second CQI associated with the second panel of the base station. For example, reference Figures 8-10 UE 1004 (or UE 804 or 904) can send CSF1036.

[0130] In some aspects, the base station can provide indications of the configuration for each of a plurality of subarrays based on the CSF. In some aspects, the configuration may include indications of the phase matrix to be applied at each of the plurality of subarrays. The indications may include indications of one or more of a known or configured phase matrix (or phase vector) and a set of scalar or offset values ​​applied to the known or configured phase matrix. For example, refer to... Figures 8-10 Base station 1002 (or base station 802 or 902) can provide a RIS configuration set 1040 indicating the set of phase matrices for the panels of RIS 1006 and RIS 1007.

[0131] At 1310, the UE can receive data transmissions from the network node via a configurable array of reflective elements based on the CSF. For example, 1310 can be... Figure 16 The transceiver 1622, antenna 1680, and / or RIS cooperative component 198 are implemented. In some aspects, each configurable reflective element array in the set of configurable reflective element arrays is a RIS, and each subarray is an independently controllable panel of the RIS in the set of configurable reflective element arrays. The terms UE and wireless device or base station and network node can be used interchangeably in the above discussion. For example, refer to Figures 8-10 UE 1004 (or UE 804 or 904) can receive data transmission set 1046.

[0132] Figure 14is a flowchart 1400 of a method of wireless communication. The method can be performed by a UE (e.g., the UE 104, 804, 904, 1004; the apparatus 1604) as an example of a wireless device. At 1402, the UE can receive, in association with a set of configurable reflecting element arrays (e.g., RISs), an indication of a state of a plurality of sub-arrays associated with each reference signal of a plurality of reference signals, the set of configurable reflecting element arrays each comprising a plurality of sub-arrays (or panels) of configurable reflecting elements. For example, 1402 can be performed by the application processor 1606, the cellular baseband processor 1624, the transceiver 1622, the antenna 1680, and / or the RIS coordination component 198 of FIG. 13B. Figure 16 In some aspects, the plurality of reference signals can comprise a subset of the plurality of reference signals to be received from each antenna port of a set of antenna ports of a network node. In some aspects, each reference signal of the plurality of reference signals can be associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflecting elements. The state of the sub-arrays indicated by the indication received by the UE at 1402 can be one of a reflecting (on) state or a non-reflecting (off) state. Additionally or alternatively, the state of the sub-arrays indicated by the indication received by the UE can be a set of phase values (or a phase matrix) indicating a phase shift and an attenuation applied by each configurable reflecting element of the sub-arrays, where an attenuation value of 0 (or 1) can indicate no reflection (e.g., a non-reflecting (off) state associated with a maximum attenuation). In some aspects, the indication of the state of the plurality of sub-arrays associated with each reference signal of the plurality of reference signals indicates at most one sub-array (or panel) in an on state (e.g., at most one panel will be in an on state for each reference signal of the plurality of reference signals). For example, with reference to FIG. 10, the UE 1004 (or the UE 804 or 904) can receive an indication 1010 of a configuration of a set of RSs for measurement, where the indication 1010 can include an indication that the set of RSs is associated with an optimization procedure or operation associated with the set of RISs (e.g., the RIS 1006 and the RIS 1007) and / or an RIS configuration associated with each RS of the set of RSs. Figures 8-10 In some aspects, the plurality of reference signals can comprise a subset of the plurality of reference signals to be received from each antenna port of a set of antenna ports of a network node. In some aspects, each reference signal of the plurality of reference signals can be associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflecting elements. The state of the sub-arrays indicated by the indication received by the UE at 1402 can be one of a reflecting (on) state or a non-reflecting (off) state. Additionally or alternatively, the state of the sub-arrays indicated by the indication received by the UE can be a set of phase values (or a phase matrix) indicating a phase shift and an attenuation applied by each configurable reflecting element of the sub-arrays, where an attenuation value of 0 (or 1) can indicate no reflection (e.g., a non-reflecting (off) state associated with a maximum attenuation). In some aspects, the indication of the state of the plurality of sub-arrays associated with each reference signal of the plurality of reference signals indicates at most one sub-array (or panel) in an on state (e.g., at most one panel will be in an on state for each reference signal of the plurality of reference signals). For example, with reference to FIG. 10, the UE 1004 (or the UE 804 or 904) can receive an indication 1010 of a configuration of a set of RSs for measurement, where the indication 1010 can include an indication that the set of RSs is associated with an optimization procedure or operation associated with the set of RISs (e.g., the RIS 1006 and the RIS 1007) and / or an RIS configuration associated with each RS of the set of RSs.

[0133] In some aspects, the set of configurable reflector element arrays can include two or more configurable reflector element arrays. A first configurable reflector element array (one of the two or more arrays) of the set of configurable reflector element arrays (e.g., RISs) can include a first plurality of sub-arrays (or panels). In some aspects, each sub-array of the first plurality of sub-arrays can be configured to reflect a plurality of reference signals associated with the first plurality of sub-arrays from the network node to the UE using a same phase matrix associated with a same beam direction (or a same reflection direction). In some aspects, the phase matrix can be a same tuple phase vector (where N is a number of configurable reflector elements in the corresponding sub-array). The reflected plurality of reference signals can be associated with reception at a wireless device (e.g., a UE).

[0134] In some aspects, a second configurable reflector element array (e.g., a second of the two or more arrays) of the set of configurable reflector element arrays can include a second plurality of sub-arrays. In some aspects, at least two sub-arrays of the second plurality of sub-arrays can be configured to reflect a plurality of reference signals associated with the second plurality of sub-arrays from the network node to the UE using different phase matrices associated with different beam directions. In some aspects, the different phase matrices can be different tuple phase vectors (where N is a number of configurable reflector elements in the corresponding sub-array). In some aspects, the different phase matrices can be based on applying a same tuple phase vector with different offset or scalar values in some aspects. In some aspects, as described above, tuple phase vector can be associated with a codebook (e.g., a set of known or configured phase vectors, which can be indicated via an index or other indicator indicating a member of the set of known or configured phase vectors).

[0135] At 1404, the UE can receive, from a network node, a plurality of reference signals from each of a set of antenna ports of the network node via a set of configurable reflector element arrays including a plurality of sub-arrays of configurable reflector elements. For example, 1404 can be performed by the transceiver 1622, the antenna 1680, and / or the RIS cooperation component 198 of FIG. 17. In some aspects, each of the plurality of reference signals can be associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements. In some aspects, the set of antenna ports can include a single antenna port and / or panel (as in Figure 16 ) or multiple antenna ports and / or panels (as in Figure 8 ). In some aspects, the set of configurable reflector element arrays can include two or more configurable reflector element arrays (e.g., RISs). In some aspects, the first configurable reflector element array of the set of configurable reflector element arrays can include a first plurality of sub-arrays (or panels). In some aspects, each sub-array of the first plurality of sub-arrays can be configured to reflect a plurality of reference signals associated with the first plurality of sub-arrays from the network node to the UE using a same phase matrix associated with a same beam direction (or a same reflection direction). In some aspects, the phase matrix can be a same Figure 9 ​​In some aspects, each reference signal associated with a corresponding subarray of a first configurable reflector element array of the set of configurable reflector element arrays is further associated with a first precoding matrix, and each reference signal associated with a corresponding subarray of a second configurable reflector element array of the set of configurable reflector element arrays is further associated with a second precoding matrix. For example, referring to Figures 8-10 At 1014, UE 1004 (or UE 804 or 904) can receive a first subset and a second subset of RSs (including RSs 1018, 1020, 1022, 1024, 1026, 1028, 1030, and 1032 associated with configurations implemented at times 1017, 1019, 1021, 1023, 1025, 1027, 1029, and 1031, respectively).

[0136] In some aspects, the UE can receive, from each antenna port of a set of antenna ports of the network node, at least one additional reference signal associated with an off state of each subarray of each configurable reflector element array of the set of configurable reflector element arrays. In some aspects, the set of antenna ports can include a single antenna port and / or panel (as in Figure 8 ) or multiple antenna ports and / or panels (as in Figure 9 The additional reference signals can be used to determine channel characteristics of one or more direct channels. For example, referring to Figures 8-10 At 1014, UE 1004 (or UE 804 or 904) can receive a first subset and a second subset of RSs (including RSs 1018, 1020, 1022, 1024, 1026, 1028, 1030, and 1032 associated with configurations implemented at times 1017, 1019, 1021, 1023, 1025, 1027, 1029, and 1031, respectively).

[0137] At 1406, the UE can determine a CSF associated with the combined channel based on the plurality of reference signals and the indication of the state of the plurality of subarrays associated with each reference signal of the plurality of reference signals. For example, 1406 can be performed by application processor 1606, cellular baseband processor 1624, transceiver 1622, antenna 1680, and / or RIS coordination component 198 of Figure 16 In some aspects, determining the CSF can be based on the plurality of reference signals received at 1404. In some aspects, the plurality of reference signals can be used to determine the CSF at 1406, as described with respect to Figures 8-10 For example, referring to Figures 8-10 At 1034, UE 1004 (or UE 804 or 904) can determine optimized parameters (e.g., parameters that optimize throughput) for communications between base station 1002 and UE 1004 using both RIS 1006 and RIS 1007 (e.g., when implementing an RIS cooperation or coordinated RIS operating mode) and generate a CSF to provide to base station 1002.

[0138] At 1408, the UE can transmit a CSF associated with a combined channel for a set of configurable reflective element arrays based on multiple reference signals. For example, 1408 can be... Figure 16 The transceiver 1622, antenna 1680, and / or RIS cooperative component 198 perform this. In some aspects, the CSF may include additional indication of a set of relative phase values ​​associated with a corresponding subset of the plurality of subarrays, the corresponding subset being associated with a configurable reflective element array in a set of configurable reflective element arrays. For example, in some aspects, a subset of the plurality of subarrays may include all subarrays in the plurality of subarrays. In some aspects, a first subarray of each configurable reflective element array (e.g., each RIS) may be associated with a first set of phase values ​​(e.g., ... The CSF may be associated with a tuple, while the remaining subarrays may be associated with a corresponding set of relative phase values. In some aspects, the CSF may include one or more of RI, PMI, or CQI. In some aspects, the CSF may also include additional RI and additional PMI associated with joint transmission (e.g., associated second transmission) from a set of antenna ports from a network node or a set of antenna port groups corresponding to a set of configurable reflective element arrays. For example, if the plurality of reference signals includes a first set of reference signals associated with a first panel of the base station and a second set of reference signals associated with a second panel of the base station, the CSF may include at least one of a first RI, a first PMI, and a first CQI associated with the first panel of the base station and at least one of a second RI, a second PMI, and a second CQI associated with the second panel of the base station. For example, reference Figures 8-10 UE 1004 (or UE 804 or 904) can send CSF1036.

[0139] In some aspects, the base station can provide indications of the configuration for each of a plurality of subarrays based on the CSF. In some aspects, the configuration may include indications of the phase matrix to be applied at each of the plurality of subarrays. The indications may include indications of one or more of a known or configured phase matrix (or phase vector) and a set of scalar or offset values ​​applied to the known or configured phase matrix. For example, refer to... Figures 8-10 Base station 1002 (or base station 802 or 902) can provide a RIS configuration set 1040 indicating the set of phase matrices for the panels of RIS 1006 and RIS 1007.

[0140] At 1410, the UE can receive data transmissions from the network node via a configurable array of reflective elements based on the CSF. For example, 1410 can be... Figure 16transceiver 1622, antenna 1680, and / or RIS coordination component 198. In some aspects, each configurable reflector array of the set of configurable reflector arrays is a RIS, and each subarray is an independently controllable panel of the RIS of the set of configurable reflector arrays. The terms UE and wireless device or base station and network node can be used interchangeably in the above discussion. For example, with reference to Figures 8-10 The UE 1004 (or UE 804 or 904) can receive a set of data transmissions 1046.

[0141] Figure 15 is a flow diagram of a method of wireless communication. The method can be performed by a RIS (e.g., a device including a configurable reflector array that can be decomposed into a plurality of subarrays of configurable reflectors and a controller) (e.g., RIS 103, 806, 807, 906, 907, 1006, 1007; RIS controller 108, 1001, 1003; RIS 1840). At 1502, the RIS can receive, from a network node, a configuration for a beam measurement procedure associated with a configurable reflector array including a plurality of subarrays of configurable reflectors and at least one additional array of additional configurable reflectors including an additional plurality of subarrays of additional configurable reflectors, and a plurality of reference signals for each antenna port of a set of antenna ports from the network node. For example, 1502 can be performed by Figure 18 controller 1841, processor 1842, transceiver 1846, passive antenna array 1880, RIS surface 1890, and / or RIS coordination component 197. In some aspects, each reference signal of the plurality of reference signals can be associated with a corresponding subarray of one of the plurality of subarrays of configurable reflectors or the additional plurality of subarrays of additional configurable reflectors. For example, with reference to Figures 8-10 The RIS 1006 (or RIS 806 or 906) and / or RIS 1007 (or RIS 807 or 907) can receive a configuration of a set of RSs and / or a set of indications of corresponding configuration sets of the RIS 1006 and / or RIS 1007 associated with the RSs 1008.

[0142] At 1504, the RIS can reflect a first subset of the plurality of reference signals based on the configuration for the beam measurement procedure. For example, 1504 can be performed by Figure 18The controller 1841, processor 1842, passive antenna array 1880, RIS surface 1890, and / or RIS cooperative component 197 perform this. In some aspects, reflecting a first subset of multiple reference signals may include: for each reference signal in the first subset of reference signals, configuring one subarray of the RIS to be in an on or reflective state based on an indicated phase matrix associated with the particular reference signal, while configuring the remaining subarrays of the RIS to be in an off or non-reflective state. The indicated phase matrix (or phase vector) may be the same for each subarray in some respects, or different for each subarray in other respects, as described above regarding... Figures 11-14 As described. For example, see reference. Figures 8-10 RIS 1006 (or RIS 806 or 906) or RIS 1007 (or RIS 807 or 907) can respectively reflect a first subset of RS (including RS 1018, 1020, 1022 and 1024 associated with the configurations implemented at times 1017, 1019, 1021 and 1023) or a second subset of RS (including RS 1026, 1028, 1030 and 1032 associated with the configurations implemented at times 1025, 1027, 1029 and 1031).

[0143] At position 1506, the RIS can suppress a second subset of reflected reference signals based on the configuration used for the beam measurement process. For example, position 1506 can be determined by... Figure 18 The controller 1841, processor 1842, transceiver 1846, passive antenna array 1880, RIS surface 1890, and / or RIS cooperative component 197 perform this. In some aspects, suppressing the reflection of a second subset of multiple reference signals may include: for each reference signal in the first subset of reference signals, configuring each subarray of the RIS to be in a closed or non-reflective state. For example, reference... Figures 8-10 RIS 1006 (or RIS 806 or 906) or RIS 1007 (or RIS 807 or 907) may suppress a second subset of the reflected RS (including RS 1026, 1028, 1030 and 1032 associated with the configurations implemented at times 1025, 1027, 1029 and 1031, respectively) or a first subset of the RS (including RS 1018, 1020, 1022 and 1024 associated with the configurations implemented at times 1017, 1019, 1021 and 1023, respectively).

[0144] At 1508, the RIS can receive instructions for the configuration of each of the multiple subarrays based on a first subset and a second subset of multiple reference signals. For example, 1508 can be... Figure 18controller 1841, processor 1842, transceiver 1846, and / or RIS coordination component 197, in accordance with some aspects. In some aspects, the configuration can include an indication of a phase matrix to apply at each of the multiple sub-arrays. The indication can include an indication of one or more of a known or configured phase matrix (or phase vector) and a set of scalar or offset values to apply to the known or configured phase matrix. For example, with reference to Figures 8-10 RIS 1006 (or RIS 806 or 906) or RIS 1007 (or RIS 807 or 907) can receive one of the set of RIS configurations 1040 indicating a set of phase matrices for panels of RIS 1006 and RIS 1007, respectively.

[0145] At 1510, the RIS can reflect the data transmissions from the network node to the wireless device based on the configuration for each of the multiple sub-arrays for reflecting transmissions from the network node to the wireless device. For example, 1510 can be performed by Figure 18 controller 1841, processor 1842, passive antenna array 1880, RIS surface 1890, and / or RIS coordination component 197, in accordance with some aspects. For example, with reference to Figures 8-10 RIS 1006 (or RIS 806 or 906) or RIS 1007 (or RIS 807 or 907) can reflect the data transmissions associated with the set of data transmissions 1046 from the base station 1002 (or base station 802 or 902) to the UE 1004 (or UE 804 or 904).

[0146] Figure 16is a diagram 1600 illustrating an example of a hardware implementation for an apparatus 1604. The apparatus 1604 can be a UE, a component of a UE, or can implement UE functionality. In some aspects, the apparatus 1604 can include at least one cellular baseband processor 1624 (also referred to as a modem) coupled with one or more transceivers 1622 (e.g., cellular RF transceivers). The cellular baseband processor 1624 can include at least one on-chip memory 1624'. In some aspects, the apparatus 1604 can further include one or more Subscriber Identity Modules (SIM) cards 1620, and at least one application processor 1606 coupled with a secure digital (SD) card 1608 and a screen 1610. The application processor 1606 can include on-chip memory 1606'. In some aspects, the apparatus 1604 can further include a Bluetooth module 1612, a WLAN module 1614, a SPS module 1616 (e.g., a GNSS module), one or more sensor modules 1618 (e.g., a barometric pressure sensor / altimeter; a motion sensor such as an inertial measurement unit (IMU), a gyroscope, and / or an accelerometer; a light detection and ranging (LIDAR), a radio detection and ranging (RADAR), a sound navigation and ranging (SONAR), a magnetometer, audio, and / or other technology for positioning), an additional memory module 1626, a power source 1630, and / or a camera 1632. The Bluetooth module 1612, the WLAN module 1614, and the SPS module 1616 can include on-chip transceivers (TRXs) (or in some cases, only receivers (RXs)). The Bluetooth module 1612, the WLAN module 1614, and the SPS module 1616 can include their own dedicated antennas, and / or utilize one or more antennas 1680 for communications. The cellular baseband processor 1624 communicates with the UE 104 and / or with a RU associated with the network entity 1602 via the one or more antennas 1680 through the transceiver 1622. The cellular baseband processor 1624 and the application processor 1606 can each include computer-readable media / memory 1624', 1606', respectively. The additional memory module 1626 can also be considered a computer-readable medium / memory. Each computer-readable medium / memory 1624', 1606', 1626 can be non-transitory. The cellular baseband processor 1624 and the application processor 1606 each are responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the cellular baseband processor 1624 / application processor 1606, causes the cellular baseband processor 1624 / application processor 1606 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the cellular baseband processor 1624 / application processor 1606 when executing software.The cellular baseband processor 1624 / application processor 1606 can be a component of the UE 350 and can include at least one of the TX processor 368, the RX processor 356, and the controller / processor 359, and / or at least one memory 360. In one configuration, the apparatus 1604 can be at least one processor chip (modem and / or application) and include only the cellular baseband processor 1624 and / or the application processor 1606, while in another configuration, the apparatus 1604 can be the entire UE (e.g., see FIG. 3.1 of the UEs 350) and include additional modules of the apparatus 1604. Figure 3

[0147] ​As discussed above, the RIS coordination component 198 can be configured to receive, from a network node via a set of configurable reflector element arrays including a plurality of sub-arrays of configurable reflector elements, a plurality of reference signals from each of a set of antenna ports of the network node, where each of the plurality of reference signals is associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements. The RIS coordination component 198 can be further configured to transmit, based on the plurality of reference signals, a CSF associated with a combined channel for the set of configurable reflector element arrays; and receive, based on the CSF, a data transmission from the network node via the set of configurable reflector element arrays. The RIS coordination component 198 can be within the cellular baseband processor 1624, the application processor 1606, or both the cellular baseband processor 1624 and the application processor 1606. The RIS coordination component 198 can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by one or more processors configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof. When implementing in multiple processors, the multiple processors can carry out the stated processes / algorithm individually or in combination. As illustrated, the device 1604 can include a variety of components configured for various functions. In one configuration, the device 1604 (and in particular the cellular baseband processor 1624 and / or the application processor 1606) can include means for receiving, from a network node via a set of configurable reflector element arrays including a plurality of sub-arrays of configurable reflector elements, a plurality of reference signals from each of a set of antenna ports of the network node. In some aspects, the device 1604 (and in particular the cellular baseband processor 1624 and / or the application processor 1606) can also include means for transmitting, based on the plurality of reference signals, a CSF associated with a combined channel for the set of configurable reflector element arrays. In some aspects, the device 1604 (and in particular the cellular baseband processor 1624 and / or the application processor 1606) can also include means for receiving, based on the CSF, a data transmission from the network node via the set of configurable reflector element arrays. In some aspects, the device 1604 (and in particular the cellular baseband processor 1624 and / or the application processor 1606) can also include means for receiving, in association with the set of configurable reflector element arrays, an indication of a state of the plurality of sub-arrays associated with each of the plurality of reference signals. In some aspects, the device 1604 (and in particular the cellular baseband processor 1624 and / or the application processor 1606) can also include means for determining, based on the plurality of reference signals and the indication of the state of the plurality of sub-arrays associated with each of the plurality of reference signals, the CSF associated with the combined channel. The means can be the RIS coordination component 198 of the device 1604 configured to perform the functions recited by the means.As described above, the apparatus 1604 can include a TX processor 368, a RX processor 356, and a controller / processor 359. Accordingly, in one configuration, the components can be a TX processor 368, a RX processor 356, and / or a controller / processor 359 configured to perform the functions recited by the components, or as otherwise described herein with respect to. Figure 13 and Figure 14 the TX processor 368, the RX processor 356, and / or the controller / processor 359 to perform functions described above as being performed by the components.

[0148] Figure 17 FIG. 17 is a diagram 1700 illustrating an example of a hardware implementation for a network entity 1702. The network entity 1702 can be a BS, a component of a BS, or can implement BS functionality. The network entity 1702 can include at least one of a CU 1710, a DU 1730, or a RU 1740. For example, the network entity 1702 can include the CU 1710; both the CU 1710 and the DU 1730; each of the CU 1710, the DU 1730, and the RU 1740; the DU 1730; both the DU 1730 and the RU 1740; or the RU 1740, depending on the layer functionality handled by the RIS cooperation component 199. The CU 1710 can include at least one CU processor 1712. The CU processor 1712 can include on-chip memory 1712'. In some aspects, the CU 1710 can also include an additional memory module 1714 and a communication interface 1718. The CU 1710 communicates with the DU 1730 over a backhaul link, such as an Fl interface. The DU 1730 can include at least one DU processor 1732. The DU processor 1732 can include on-chip memory 1732'. In some aspects, the DU 1730 can also include an additional memory module 1734 and a communication interface 1738. The DU 1730 communicates with the RU 1740 over a front-haul link. The RU 1740 can include at least one RU processor 1742. The RU processor 1742 can include on-chip memory 1742'. In some aspects, the RU 1740 can also include an additional memory module 1744, one or more transceivers 1746, one or more antennas 1780, and a communication interface 1748. The RU 1740 communicates with the UE 104. The on-chip memories 1712', 1732', 1742' and the additional memory modules 1714, 1734, 1744 can each be considered a computer- readable medium / memory. Each computer-readable medium / memory can be non-transitory. Each of the processors 1712, 1732, 1742 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the corresponding processor, causes the processor to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the processor when executing software.

[0149] As discussed above, the RIS coordination component 199 can be configured to transmit a plurality of reference signals from each of a set of antenna ports of a network node in association with a set of configurable reflector element arrays each comprising a plurality of sub-arrays of configurable reflector elements, where each of the plurality of reference signals is associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements. The RIS coordination component 199 can be further configured to receive, based on the plurality of reference signals, a CSF associated with a combined channel for the set of configurable reflector element arrays; and provide, based on the CSF, an indication of a configuration for each of the plurality of sub-arrays. The RIS coordination component 199 can be within one or more processors of one or more of the CU 1710, the DU 1730, and the RU 1740. The RIS coordination component 199 can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by one or more processors configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof. When multiple processors are used, the stated processes / algorithm can be executed by the multiple processors either separately or in combination. The network entity 1702 can include multiple components that are configured for various functions. In one configuration, the network entity 1702 can include means for transmitting a plurality of reference signals from each of a set of antenna ports of a network node in association with a set of configurable reflector element arrays each comprising a plurality of sub-arrays of configurable reflector elements. In some aspects, the network entity 1702 can include means for receiving, based on the plurality of reference signals, a CSF associated with a combined channel for the set of configurable reflector element arrays. In some aspects, the network entity 1702 can include means for providing, based on the CSF, an indication of a configuration for each of the plurality of sub-arrays. In some aspects, the network entity 1702 can include means for transmitting data transmissions for a wireless device via the set of configurable reflector element arrays using a precoding matrix based on the CSF. In some aspects, the network entity 1702 can include means for providing, for the set of configurable reflector element arrays, an additional indication of a state of the plurality of sub-arrays associated with each of the plurality of reference signals. In some aspects, the network entity 1702 can include means for transmitting, from each of the set of antenna ports of the network node, at least one additional reference signal associated with an off state of each sub-array in each of the set of configurable reflector element arrays. The means can be the RIS coordination component 199 of the network entity 1702 configured to perform the functions recited by the means. As described above, the network entity 1702 can include the TX processor 316, the RX processor 370, and the controller / processor 375.Thus, in one configuration, the means can be a TX processor 316, an RX processor 370, and / or a controller / processor 375 configured to perform the functions recited by the means or as otherwise described with respect to the above. Figure 11 and Figure 12 the TX processor 316, the RX processor 370, and / or the controller / processor 375 described above.

[0150] Figure 18 is a diagram 1800 illustrating an example of a hardware implementation for an RIS 1840. The RIS 1840 includes a RIS surface 1890 that includes a passive antenna array 1880. The RIS surface 1890 includes a surface with a large number of densely placed reconfigurable elements that can reflect or refract electromagnetic waves in a target direction. Figure 18 An example of the RIS surface 1890 illustrating communication between a reflecting UE 104 and a base station 102. The RIS 1840 includes a controller 1841 that controls the angle of incidence and the angle of reflection, for example, by controlling the reflection coefficients (or phase shifts introduced by) of the antenna elements of the RIS surface 1890. The controller 1841 can exchange communications, including control signaling or other signaling, with network nodes such as the base station 102 or components of the base station 102 and / or the UE 104. The controller 1841 can exchange communications via at least one transceiver 1846. The controller 1841 can include at least one processor 1842. The processor 1842 can include on-chip memory 1842'. In some aspects, the controller 1841 can also include an additional memory module 1844. The on-chip memory 1842' and the additional memory module 1844 can each be considered a computer- readable medium / memory. Each computer-readable medium / memory can be non-transitory. The processor 1842 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the corresponding processor, causes the processor to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the processor when executing software.

[0151] As discussed above, the RIS cooperation component 197 may be configured to receive from a network node a configuration for a beam measurement process associated with a configurable reflective element array including a plurality of subarrays of configurable reflective elements and at least one additional array of additional configurable reflective elements including additional subarrays of additional configurable reflective elements, and a plurality of reference signals from each antenna port in a set of antenna ports of the network node, wherein each of the plurality of reference signals is associated with a corresponding subarray of one of the plurality of subarrays of configurable reflective elements or the additional subarrays of additional configurable reflective elements. The RIS cooperation component 197 may be further configured to reflect a first subset of the plurality of reference signals to a wireless device based on the configuration for the beam measurement process. The RIS cooperation component 197 may be additionally configured to suppress the reflection of a second subset of the plurality of reference signals based on the configuration for the beam measurement process; and to receive, based on the first and second subsets of the plurality of reference signals, an indication of the configuration for reflecting at least one data transmission from the network node to the wireless device for each of the plurality of subarrays. The RIS cooperation component 197 may be within a processor 1842. The RIS collaboration component 197 may be one or more hardware components specifically configured to perform the stated process / algorithm, implemented by one or more processors configured to perform the stated process / algorithm, stored in a computer-readable medium for implementation by one or more processors, or some combination thereof. The RIS 1840 may include a variety of components configured for various functions. In one configuration, the RIS 1840 may include components for receiving from a network node a configuration for a beam measurement process associated with a configurable reflective element array including a plurality of subarrays of configurable reflective elements and at least one additional array of additional configurable reflective elements including additional subarrays of additional configurable reflective elements, and a plurality of reference signals from each antenna port in a set of antenna ports of the network node. In one configuration, the RIS 1840 may include components for reflecting a first subset of the plurality of reference signals to a wireless device based on the configuration for the beam measurement process. In one configuration, the RIS 1840 may include components for suppressing the reflection of a second subset of the plurality of reference signals based on the configuration for the beam measurement process. In one configuration, the RIS 1840 may include components for receiving, based on a first subset and a second subset of a plurality of reference signals, an indication of a configuration for transmitting at least one data transmission from a network node to a wireless device for each of a plurality of subarrays. In another configuration, the RIS 1840 may include components for transmitting data from a network node to a wireless device based on a configuration for transmitting data from a network node to a wireless device for each of a plurality of subarrays. The components may be of the RIS 1840 configured to perform actions described by the components or as per [the relevant information]. Figure 15The RIS coordination component 197 of the described functionality.

[0152] In some aspects of wireless communications, a communication path (e.g., a line of sight path) from a base station to a UE can be obstructed. In some aspects, the impact of the obstruction can be avoided or mitigated by using an array of configurable reflecting elements (e.g., a RIS) to reflect a transmitted beam along a path that avoids (or does not include) the obstruction. The RIS can be further subdivided into individually configurable panels that can be used to direct an impinging beam in multiple different directions (e.g., for multiple UEs) or to refine the reflection of an impinging beam in a single direction (e.g., for a single UE). In some aspects, multiple arrays of configurable reflecting elements can each be usable to participate in one of multiple potential communication paths.

[0153] Various aspects generally relate to coordination between multiple RISs and RIS subarrays and / or RIS panels for communications between a network node and a wireless device (e.g., a UE). Some aspects more specifically relate to a beam measurement procedure for determining a configuration of each panel of multiple RISs for communications between a network node and a wireless device. In some examples, a network node can transmit a plurality of reference signals from each of a set of antenna ports of the network node in association with a set of configurable reflecting element arrays (e.g., multiple RISs), which each include a plurality of subarrays of configurable reflecting elements (e.g., panels of RISs). In some aspects, each of the plurality of reference signals can be associated with a corresponding panel of RISs (e.g., one of a plurality of panels of multiple RISs). In some aspects, the network node can also provide an additional indication of a state (e.g., an on / off state and / or a phase matrix of each panel in an on state) of the plurality of panels associated with each of the plurality of reference signals for the multiple RISs. A wireless device can receive (and measure) the plurality of reference signals, generate a CSF associated with a combined channel for the multiple RISs, and transmit the CSF to the network node. The network can receive the CSF associated with the combined channel for the set of configurable reflecting element arrays and provide an indication of a configuration for each of the plurality of panels for subsequent communications between the network node and the base station based on the CSF. The network node can then transmit a data transmission via the multiple RISs based on the configuration for each of the plurality of panels provided and / or indicated by the network node, and the wireless device can receive the data transmission from the network node via the multiple RISs.

[0154] The present disclosure proposes techniques for CSI-RS and CSF to support coherent joint transmission (CJT) from two or more RIS nodes reflecting transmissions from a gNB transmitter. The present disclosure specifically proposes a CSF scheme for coordination of multiple RIS nodes.

[0155] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, by determining an optimized phase matrix configuration for multiple panels of multiple RISs (e.g., determining optimized panel-specific phase matrices) and configuring the multiple panels based on the determined optimized phase matrix configurations, the described techniques can be used to improve spectral efficiency and associated throughput by configuring multiple panels of multiple RISs with panel-specific phase matrices.

[0156] It should be appreciated that a specific ordering or hierarchy of the blocks in the disclosed processes / flow diagrams is merely illustrative of example methods. It should be appreciated that the specific ordering or hierarchy of the blocks in the processes / flow diagrams can be rearranged based on design preference. Moreover, some blocks can be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not necessarily limited to the specific order or hierarchy presented.

[0157] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects. Thus, the claims are not to be limited to the aspects described herein, but are to be given the full scope defined by the language of the claims. Unless otherwise defined, a reference to a singular element includes “one or more” thereof. Terms such as “if,” “when,” and “while” do not imply direct temporal relationships or reactions. That is, the phrases, “when,” “if,” and “while,” for example, do not necessarily mean that an action occurs immediately in response to an occurrence of an action or during an occurrence of an action, but simply imply that an action will occur if a condition is met, without necessarily requiring a specific or immediate temporal relationship or reaction. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of the group consisting of A, B, and C,” “one or more of the group consisting of A, B, and C,” and “A, B, and / or C or any combination thereof’ include number one, number two, number three, number one and number two, number one and number three, number two and number three, and number one, number two, and number three. Specifically, combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of the group consisting of A, B, and C,” “one or more of the group consisting of A, B, and C,” and “A, B, and / or C or any combination thereof’ can be one A, one B, one C, one A and one B, one A and one C, one B and one C, or one A, one B, and one C, where any of A, B, or C can be one or more members of that set. A set should be interpreted as a collection of elements that can be one or more. Thus, a set of X includes one or more X. When a set of at least one processor is configured to perform a set of functions, the at least one processor is individually or in any combination configured to perform the set of functions. Thus, each processor of the at least one processor can be configured to perform a particular subset of the set of functions, where the subset is a proper subset of the complete set, a proper superset of the complete set, or the complete set itself. If a first device receives data from a second device or sends data to the second device, the data can be received or sent directly from or to the first device and the second device, or indirectly via a set of devices between the first device and the second device. A device configured to “output” data, such as a signal or message, may, for example, send the data with a transceiver, or can transfer the data to a device that sends the data.A device configured to "obtain" data (such as transmit, signal, or message) can, for example, receive the data with a transceiver, or can obtain the data from a device that received the data. Information stored in memory includes instructions and / or data. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, any combination of the

[0158] As used herein, the phrase "based on" shall not be construed as a signification of an exclusive set of items, conditions, factors, etc. on which information, condition, factor, etc. is based. In other words, the phrase "based on A" (where A can be information, conditions, factors, etc.) shall be interpreted as "based at least on A," unless otherwise specifically stated.

[0159] The following aspects are merely exemplary and can be combined with other aspects or teachings described herein without limitation.

[0160] Aspect 1 is a method of wireless communication at a network node, the method comprising: transmitting, from each antenna port of a set of antenna ports of the network node, a plurality of reference signals in association with a set of configurable reflector element arrays each comprising a plurality of sub-arrays of configurable reflector elements, wherein each reference signal of the plurality of reference signals is associated with a corresponding sub-array of the plurality of sub-arrays of configurable reflector elements; receiving channel state feedback (CSF) associated with a combined channel for the set of configurable reflector element arrays based on the plurality of reference signals; and providing an indication of a configuration for each sub-array of the plurality of sub-arrays based on the CSF.

[0161] Aspect 2 is the method of Aspect 1, wherein the set of configurable reflector element arrays comprises two or more configurable reflector element arrays.

[0162] Aspect 3 is the method of any of aspects 1 or 2, wherein a first configurable reflector element array of the set of configurable reflector element arrays comprises a first plurality of sub-arrays, wherein each sub-array of the first plurality of sub-arrays is configured to reflect the plurality of reference signals associated with the first plurality of sub-arrays from the network node to a wireless device using a same phase matrix associated with a same beam direction, wherein the wireless device is associated with reception of the plurality of reference signals.

[0163] Aspect 4 is the method of any of aspects 1-3, wherein a second configurable reflector element array of the set of configurable reflector element arrays comprises a second plurality of sub-arrays, wherein at least two sub-arrays of the second plurality of sub-arrays are configured to reflect the plurality of reference signals associated with the second plurality of sub-arrays from the network node to a wireless device using different phase matrices associated with different beam directions, wherein the wireless device is associated with reception of the plurality of reference signals.

[0164] Aspect 5 is the method of aspect 4, wherein each of the different phase matrices is associated with a codebook.

[0165] Aspect 6 is the method of any of aspects 1-5, wherein the CSF comprises an additional indication of a set of relative phase values associated with a corresponding subset of the plurality of sub-arrays, the corresponding subset being associated with a configurable reflector element array of the set of configurable reflector element arrays.

[0166] Aspect 7 is the method of aspect 6, wherein the CSF further comprises one or more of a rank indicator (RI), a precoding matrix indicator (PMI), or a channel quality indicator (CQI).

[0167] Aspect 8 is the method of any of aspects 6 or 7, wherein the set of relative phase values comprises a set of quantized relative phase values that approximate a set of optimal relative phase values.

[0168] Aspect 9 is the method of any of aspects 1-8, wherein each reference signal associated with a corresponding sub-array of a first configurable reflector element array of the set of configurable reflector element arrays is further associated with a first precoding matrix, and wherein each reference signal associated with a corresponding sub-array of a second configurable reflector element array of the set of configurable reflector element arrays is further associated with a second precoding matrix.

[0169] Aspect 10 is the method of Aspect 9, wherein the CSF further includes additional RIs and additional PMIs associated with joint transmission of one of the set of antenna ports from the network node or a set of antenna port groups corresponding to the set of configurable reflectron element arrays.

[0170] Aspect 11 is the method of any of aspects 1 through 10, wherein the plurality of reference signals are associated with a wireless device, the method further comprising: transmitting a data transmission for the wireless device via the set of configurable reflectron element arrays using a precoding matrix based on the CSF.

[0171] Aspect 12 is the method of any of aspects 1 through 11, wherein the plurality of reference signals are associated with a wireless device, wherein each configurable reflectron element array of the set of configurable reflectron element arrays is a reconfigurable intelligent surface (RIS), and each subarray is an independently controllable panel of the RIS of the set of configurable reflectron element arrays, wherein the wireless device is a user equipment (UE), and wherein the network node is a base station.

[0172] Aspect 13 is the method of any of aspects 1 through 12, the method further comprising: providing, for the set of configurable reflectron element arrays, an additional indication of a state of the plurality of subarrays associated with each of the plurality of reference signals, wherein the state of a subarray is one of a reflective (on) state or a non-reflective (off) state; and transmitting, from each of the set of antenna ports of the network node, at least one additional reference signal associated with an off state of each subarray in each configurable reflectron element array of the set of configurable reflectron element arrays.

[0173] Aspect 14 is the method of Aspect 13, wherein the additional indication of the state of the plurality of subarrays associated with each of the plurality of reference signals indicates at most one subarray in an on state.

[0174] Aspect 15 is a method of wireless communication at a wireless device, the method comprising: receiving, from a network node via a set of configurable reflectron element arrays, a plurality of reference signals from each of a set of antenna ports of the network node, the set of configurable reflectron element arrays comprising a plurality of subarrays of configurable reflectrons, wherein each of the plurality of reference signals is associated with a corresponding subarray of the plurality of subarrays of configurable reflectrons; transmitting, based on the plurality of reference signals, a channel state feedback (CSF) associated with a combined channel for the set of configurable reflectron element arrays; and receiving, based on the CSF, a data transmission from the network node via the set of configurable reflectron element arrays.

[0175] Aspect 16 is the method of Aspect 15, wherein the CSF comprises an indication of a set of relative phase values associated with a corresponding subset of the plurality of sub-arrays, the corresponding subset being associated with a configurable reflector element array of the set of configurable reflector element arrays.

[0176] Aspect 17 is the method of Aspect 16, wherein the CSF further comprises one or more of a rank indicator (RI), a precoding matrix indicator (PMI), or a channel quality indicator (CQI).

[0177] Aspect 18 is the method of any one of Aspects 16-17, wherein the set of relative phase values comprises a set of quantized relative phase values that approximate a set of optimal relative phase values.

[0178] Aspect 19 is the method of any one of Aspects 15-18, the method further comprising: receiving, in association with the set of configurable reflector element arrays, an indication of a state of the plurality of sub-arrays associated with each of the plurality of reference signals, wherein the state of a sub-array is one of a reflective (on) state or a non-reflective (off) state; and determining the CSF associated with the combined channel based on the plurality of reference signals and the indication of the state of the plurality of sub-arrays associated with each of the plurality of reference signals.

[0179] Aspect 20 is the method of Aspect 19, wherein the indication of the state of the plurality of sub-arrays associated with each of the plurality of reference signals indicates at most one sub-array in an on state.

[0180] Aspect 21 is the method of any one of Aspects 15-20, wherein each configurable reflector element array of the set of configurable reflector element arrays is a reconfigurable intelligent surface (RIS), and each sub-array is an independently controllable panel of the RIS of the set of configurable reflector element arrays, wherein the wireless device is a user equipment (UE), and wherein the network node is a base station.

[0181] Aspect 22 is a method of wireless communication at an array of configurable reflecting elements, the method comprising: receiving, from a network node, a configuration for a beam measurement procedure associated with the array of configurable reflecting elements including a plurality of sub-arrays of the configurable reflecting elements and at least one additional array of additional configurable reflecting elements including an additional plurality of sub-arrays of the additional configurable reflecting elements, and a plurality of reference signals from each antenna port of a set of antenna ports of the network node, wherein each reference signal of the plurality of reference signals is associated with a corresponding sub-array of one of the plurality of sub-arrays of the configurable reflecting elements or the additional plurality of sub-arrays of the additional configurable reflecting elements; reflecting a first subset of the plurality of reference signals to a wireless device based on the configuration for the beam measurement procedure; refraining from reflecting a second subset of the plurality of reference signals based on the configuration for the beam measurement procedure; and receiving an indication of a configuration for each of the plurality of sub-arrays for reflecting at least one data transmission from the network node to the wireless device based on the first and second subsets of the plurality of reference signals.

[0182] Aspect 23 is the method of Aspect 22, further comprising: reflecting a data transmission from the network node to the wireless device based on the configuration for each of the plurality of sub-arrays for reflecting transmissions from the network node to the wireless device.

[0183] Aspect 24 is an apparatus for wireless communication at a device, the apparatus comprising a memory and at least one processor coupled to the memory and configured to implement any of aspects 1 through 14 based at least in part on information stored in the memory.

[0184] Aspect 25 is the apparatus of Aspect 24, further comprising at least one of a transceiver or an antenna coupled to the at least one processor, wherein to receive a CSF, the at least one processor is configured to receive the CSF via at least one of the transceiver or the antenna.

[0185] Aspect 26 is an apparatus for wireless communication at a device, the apparatus comprising means for implementing any of aspects 1 through 14.

[0186] Aspect 27 is a computer-readable medium (for example, a non-transitory computer- readable medium) storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1 through 14.

[0187] Aspect 28 is an apparatus for wireless communication at a device, the apparatus comprising a memory and at least one processor coupled to the memory and configured to implement any of aspects 15 through 21 based at least in part on information stored in the memory.

[0188] Aspect 29 is the apparatus of aspect 28, further comprising at least one of a transceiver or an antenna coupled to the at least one processor, wherein to transmit the CSF, the at least one processor is configured to transmit the CSF via the at least one of the transceiver or the antenna.

[0189] Aspect 30 is an apparatus for wireless communication at a device, the apparatus comprising means for implementing any of aspects 15 through 21.

[0190] Aspect 31 is a computer-readable medium (for example, a non-transitory computer- readable medium) storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 15 through 21.

[0191] Aspect 32 is an apparatus for wireless communication at a device, the apparatus comprising a memory and at least one processor coupled to the memory and configured to implement any of aspects 22 or 23 based at least in part on information stored in the memory.

[0192] Aspect 33 is the apparatus of aspect 32, further comprising at least one of a transceiver or an antenna coupled to the at least one processor, wherein to receive a configuration for a beam measurement procedure associated with an array of configurable reflective elements, the at least one processor is configured to receive, via the at least one of the transceiver or the antenna, the configuration for the beam measurement procedure associated with the array of configurable reflective elements.

[0193] Aspect 34 is an apparatus for wireless communication at a device, the apparatus comprising means for implementing any of aspects 22 or 23.

[0194] Aspect 35 is a computer-readable medium (for example, a non-transitory computer- readable medium) storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 22 or 23.

Claims

1. An apparatus for wireless communication at a network node, the apparatus comprising: At least one memory; as well as At least one processor, coupled to the at least one memory, and configured individually or in any combination, based at least in part on information stored in the at least one memory, to: Multiple reference signals are transmitted from each antenna port of the network node's antenna port set in association with a set of configurable reflective element arrays, each of the set of configurable reflective element arrays comprising multiple subarrays of the configurable reflective elements, wherein each of the multiple reference signals is associated with a corresponding subarray of the multiple subarrays of the configurable reflective elements; Based on the plurality of reference signals, channel state feedback (CSF) associated with the combined channel for the set of configurable reflective element arrays is received. as well as The CSF is used to provide instructions for the configuration of each of the plurality of subarrays.

2. The apparatus of claim 1, wherein the configurable reflective element array set comprises two or more configurable reflective element arrays.

3. The apparatus of claim 1, wherein the first configurable reflective element array in the set of configurable reflective element arrays comprises a first plurality of subarrays, wherein each of the first plurality of subarrays is configured to reflect the plurality of reference signals associated with the first plurality of subarrays from the network node to a wireless device using the same phase matrix associated with the same beam direction, wherein the wireless device is associated with receiving the plurality of reference signals.

4. The apparatus of claim 1, wherein the second configurable reflective element array in the set of configurable reflective element arrays comprises a second plurality of subarrays, wherein at least two of the second plurality of subarrays are configured to reflect the plurality of reference signals associated with the second plurality of subarrays from the network node to a wireless device using different phase matrices associated with different beam directions, wherein the wireless device is associated with receiving the plurality of reference signals.

5. The apparatus of claim 1, wherein the CSF includes an additional indication of a set of relative phase values ​​associated with a corresponding subset of the plurality of subarrays, the corresponding subset being associated with a configurable reflective element array in the set of configurable reflective element arrays.

6. The apparatus of claim 5, wherein the CSF further comprises one or more of a rank indicator (RI), a pre-decoding matrix indicator (PMI), or a channel quality indicator (CQI).

7. The apparatus of claim 5, wherein the set of relative phase values ​​comprises a quantized set of relative phase values ​​that approximates the optimal set of relative phase values.

8. The apparatus of claim 1, wherein each reference signal associated with a corresponding subarray of a first configurable reflective element array in the set of configurable reflective element arrays is further associated with a first pre-decoding matrix, and wherein each reference signal associated with a corresponding subarray of a second configurable reflective element array in the set of configurable reflective element arrays is further associated with a second pre-decoding matrix.

9. The apparatus of claim 8, wherein the CSF further includes additional RI and additional PMI associated with joint transmission from one of the antenna port set from the network node or the antenna port group set corresponding to the configurable reflective element array set.

10. The apparatus of claim 1, wherein the plurality of reference signals are associated with a wireless device, and wherein the at least one processor is further configured individually or in any combination to: Data transmission is performed on the wireless device using a pre-decoding matrix based on the CSF via the configurable array of reflective elements.

11. The apparatus of claim 1, wherein the plurality of reference signals are associated with a wireless device, wherein the configurable reflective element array set is a reconfigurable smart surface (RIS) set, and each subarray is an independently controllable panel of a RIS in the RIS set, wherein the wireless device is a user equipment (UE), and wherein the network node is a base station.

12. The apparatus of claim 1, wherein the at least one processor is further configured, individually or in any combination, to: The configurable array of reflective elements provides additional indication of the state of the plurality of subarrays associated with each of the plurality of reference signals, wherein the state of the subarray is either a reflective (on) state or a non-reflective (off) state; and At least one additional reference signal associated with the off state of each subarray in each configurable reflective element array in the set of antenna ports of the network node is transmitted from each antenna port of the set of antenna ports of the network node.

13. The apparatus of claim 12, further comprising at least one of a transceiver or an antenna coupled to the at least one processor, wherein, in order to receive the CSF, the at least one processor is configured to receive the CSF via the transceiver or the antenna, wherein the additional indication of the state of the plurality of subarrays associated with each of the plurality of reference signals indicates that at most one subarray is in an on state.

14. An apparatus for conducting wireless communication at a wireless device, the apparatus comprising: At least one memory; as well as At least one processor, coupled to the at least one memory, and configured individually or in any combination, based at least in part on information stored in the at least one memory, to: Multiple reference signals are received from each antenna port of a set of antenna ports of a network node via a set of configurable reflective element arrays, the set of configurable reflective element arrays including multiple subarrays of the configurable reflective elements, wherein each of the multiple reference signals is associated with a corresponding subarray of the multiple subarrays of the configurable reflective elements; Based on the plurality of reference signals, channel state feedback (CSF) associated with the combined channel for the set of configurable reflective element arrays is transmitted. as well as Data is received from the network node via the configurable array of reflective elements based on the CSF.

15. The apparatus of claim 14, wherein the CSF includes an indication of a set of relative phase values ​​associated with a corresponding subset of the plurality of subarrays, the corresponding subset being associated with a configurable reflective element array in the set of configurable reflective element arrays.

16. The apparatus of claim 15, wherein the CSF further comprises one or more of a rank indicator (RI), a pre-decoding matrix indicator (PMI), or a channel quality indicator (CQI).

17. The apparatus of claim 15, wherein the set of relative phase values ​​comprises a quantized set of relative phase values ​​that approximates the optimal set of relative phase values.

18. The apparatus of claim 14, wherein the at least one processor is further configured, alone or in any combination, to: The configurable array of reflective elements receives, in association with, an indication of the state of the plurality of subarrays associated with each of the plurality of reference signals, wherein the state of the subarray is either a reflective (on) state or a non-reflective (off) state; and The CSF associated with the combined channel is determined based on the plurality of reference signals and the indication of the state of the plurality of subarrays associated with each of the plurality of reference signals.

19. The apparatus of claim 18, further comprising at least one of a transceiver or an antenna coupled to the at least one processor, wherein, in order to transmit the CSF, the at least one processor is configured to transmit the CSF via at least one of the transceiver or the antenna, wherein the indication of the state of the plurality of subarrays associated with each of the plurality of reference signals indicates that at most one subarray is in an on state.

20. The apparatus of claim 14, wherein each configurable reflective element array in the set of configurable reflective element arrays is a reconfigurable smart surface (RIS), and each subarray is an independently controllable panel of the RIS in the set of configurable reflective element arrays, wherein the wireless device is a user equipment (UE), and wherein the network node is a base station.

21. A method for wireless communication at a network node, the method comprising: Multiple reference signals are transmitted from each antenna port of the network node's antenna port set in association with a set of configurable reflective element arrays, each of the set of configurable reflective element arrays comprising multiple subarrays of the configurable reflective elements, wherein each of the multiple reference signals is associated with a corresponding subarray of the multiple subarrays of the configurable reflective elements; Based on the plurality of reference signals, channel state feedback (CSF) associated with the combined channel for the set of configurable reflective element arrays is received. as well as The CSF is used to provide instructions for the configuration of each of the plurality of subarrays.

22. The method of claim 21, wherein the configurable reflective element array set comprises two or more configurable reflective element arrays.

23. The method of claim 21, wherein the CSF includes an additional indication of a set of relative phase values ​​associated with a corresponding subset of the plurality of subarrays, the corresponding subset being associated with a configurable reflective element array in the set of configurable reflective element arrays, wherein the CSF further includes one or more of a rank indicator (RI), a pre-decoding matrix indicator (PMI), or a channel quality indicator (CQI).

24. The method of claim 21, wherein each reference signal associated with a corresponding subarray of a first configurable reflective element array in the set of configurable reflective element arrays is further associated with a first pre-decoding matrix, and wherein each reference signal associated with a corresponding subarray of a second configurable reflective element array in the set of configurable reflective element arrays is further associated with a second pre-decoding matrix.

25. The method of claim 21, wherein the plurality of reference signals are associated with a wireless device, the method further comprising: Data transmission is performed on the wireless device using a pre-decoding matrix based on the CSF via the configurable array of reflective elements.

26. The method of claim 21, further comprising: Additional indications are provided for the state of the plurality of subarrays associated with each of the plurality of reference signals, wherein the state of the subarray is either a reflective (on) state or a non-reflective (off) state. as well as At least one additional reference signal associated with the off state of each subarray in each configurable reflective element array in the set of antenna ports of the network node is transmitted from each antenna port of the set of antenna ports of the network node.

27. A method for performing wireless communication at a wireless device, the method comprising: Multiple reference signals are received from each antenna port of a set of antenna ports of a network node via a set of configurable reflective element arrays, the set of configurable reflective element arrays including multiple subarrays of the configurable reflective elements, wherein each of the multiple reference signals is associated with a corresponding subarray of the multiple subarrays of the configurable reflective elements; Based on the plurality of reference signals, channel state feedback (CSF) associated with the combined channel for the set of configurable reflective element arrays is transmitted. as well as Data is received from the network node via the configurable array of reflective elements based on the CSF.

28. The method of claim 27, wherein the CSF includes an indication of a set of relative phase values ​​associated with a corresponding subset of the plurality of subarrays, the corresponding subset being associated with a configurable reflective element array in the set of configurable reflective element arrays.

29. The method of claim 28, wherein the CSF further comprises one or more of a rank indicator (RI), a pre-decoding matrix indicator (PMI), or a channel quality indicator (CQI).

30. The method of claim 27, further comprising: The system receives, in association with the configurable array of reflective elements, an indication of the state of the plurality of subarrays associated with each of the plurality of reference signals, wherein the state of the subarray is either a reflective (on) state or a non-reflective (off) state. as well as The CSF associated with the combined channel is determined based on the plurality of reference signals and the indication of the state of the plurality of subarrays associated with each of the plurality of reference signals.

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