Updating coefficients for reconfigurable surfaces

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive, from a network entity, an indication of a first set of one or more values for configuration coefficients for a reconfigurable surface. When the reconfigurable surface is configured according to a first set of one or more values of configuration coefficients, the UE may receive one or more reference signals from the network entity via the reconfigurable surface. The UE may determine a second set of one or more values of configuration coefficients for the reconfigurable surface based on the first set of one or more values of configuration coefficients and the received one or more reference signals. The UE may send an indication to the network entity of a second set of one or more values of configuration coefficients for the reconfigurable surface.

Description

Technical Field

[0001] The following content relates to wireless communication, including updating coefficients for reconfigurable surfaces. Background Technology

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems (such as Long Term Evolution (LTE) systems, LTE-A Advanced (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems may employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal FDMA (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations, each supporting wireless communication of communication devices, which may be referred to as User Equipment (UE).

[0003] In some examples, the user equipment (UE) can communicate with network entities. For instance, the UE can communicate with a network entity via a direct link between the UE and the network entity. In other examples, the direct link between the UE and the network entity may fail. For example, an object may block the direct link. In such examples, the UE may be unable to communicate with the network entity. Techniques that enable the UE to communicate with network entities when the direct link is blocked can improve the efficiency of wireless communication. Summary of the Invention

[0004] The described technology relates to improved methods, systems, devices, and apparatuses for supporting the updating of values ​​for coefficients (e.g., reflection or refraction coefficients) used for reconfigurable surfaces. For example, the described technology allows a user equipment (UE) to use channel estimation to determine one or more values ​​for one or more configuration coefficients (e.g., optimization coefficients, recommendation coefficients) used for a reconfigurable surface. For example, the UE can receive from a network entity an indication of a first set of values ​​for one or more configuration coefficients used for the reconfigurable surface. When configuring the reconfigurable surface according to the first set of values ​​for one or more configuration coefficients, the UE can receive one or more reference signals from the network entity via the reconfigurable surface. The UE can determine a second set of values ​​for one or more configuration coefficients used for the reconfigurable surface (e.g., a set of one or more optimized or recommendation values ​​for the configuration coefficients) based on the first set of values ​​for one or more configuration coefficients and the received one or more reference signals. The UE can send an indication of the second set of values ​​for one or more configuration coefficients used for the reconfigurable surface to the network entity.

[0005] A method for wireless communication at a user equipment (UE) is described. The method may include: receiving from a network entity an indication of a first set of one or more values ​​of configuration coefficients for a reconfigurable surface; receiving one or more reference signals from the network entity via the reconfigurable surface when the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients; determining a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based on the first set of one or more values ​​of the configuration coefficients and the received one or more reference signals; and transmitting to the network entity an indication of the second set of one or more values ​​of the configuration coefficients for the reconfigurable surface.

[0006] An apparatus for wireless communication is described. The apparatus may include: a memory; a transceiver; and at least one processor of a UE, the at least one processor being coupled to the memory and the transceiver. The at least one processor may be configured to: receive from a network entity an indication of a first set of one or more values ​​of configuration coefficients for a reconfigurable surface; receive one or more reference signals from the network entity via the reconfigurable surface when the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients; determine a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based on the first set of one or more values ​​of the configuration coefficients and the received one or more reference signals; and transmit to the network entity an indication of the second set of one or more values ​​of the configuration coefficients for the reconfigurable surface.

[0007] Another apparatus for wireless communication at a UE is described. The apparatus may include: means for receiving from a network entity an indication of a first set of one or more values ​​of configuration coefficients for a reconfigurable surface; means for receiving one or more reference signals from the network entity via the reconfigurable surface when configuring the reconfigurable surface according to the first set of one or more values ​​of the configuration coefficients; means for determining a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based on the first set of one or more values ​​of the configuration coefficients and the received one or more reference signals; and means for transmitting to the network entity an indication of the second set of one or more values ​​of the configuration coefficients for the reconfigurable surface.

[0008] A non-transitory computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: receive from a network entity an indication of a first set of one or more values ​​for configuration coefficients for a reconfigurable surface; receive one or more reference signals from the network entity via the reconfigurable surface when the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients; determine a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based on the first set of one or more values ​​of the configuration coefficients and the received one or more reference signals; and send to the network entity an indication of the second set of one or more values ​​of the configuration coefficients for the reconfigurable surface.

[0009] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for receiving from a network entity an indication of one or more parameters for a communication link between the network entity and a reconfigurable surface, wherein the one or more parameters include propagation delay, propagation direction, transmission power, or any combination thereof, and wherein an indication of transmitting a second set of values ​​for one or more configuration coefficients may be based on receiving an indication of one or more parameters.

[0010] In some examples of the methods, apparatus, and nontransitory computer-readable media described herein, an indication of a first set of values ​​for one or more configuration coefficients includes an indication of a first mode for each element in a set of elements for activating or deactivating a reconfigurable surface, and an indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second mode for each element in a set of elements for activating or deactivating a reconfigurable surface.

[0011] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, an indication of a first set of values ​​for one or more configuration coefficients includes an indication of a first set of weight vectors, and an indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second set of weight vectors.

[0012] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the indication of a first set of weight vectors includes an indication of a first set of codeword indices, and the indication of a second set of weight vectors includes an indication of a second set of codeword indices.

[0013] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the indication of a first set of weight vectors includes an indication of the corresponding phase and corresponding magnitude of each element of each weight vector in the first set of weight vectors, and the indication of a second set of weight vectors includes an indication of the corresponding phase and corresponding magnitude of each element of each weight vector in the second set of weight vectors.

[0014] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, an indication of a second set of values ​​for one or more configuration coefficients indicates a codeword from a codebook.

[0015] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for sending an indication to a network entity whether a codeword may come from a first type of codebook or a second type of codebook.

[0016] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, a second set of one or more values ​​of configuration coefficients corresponds to a weighted sum of a set of multiple codewords, and an indication of the second set of one or more values ​​of configuration coefficients indicates a set of multiple codewords and a set of weights for obtaining the weighted sum of the set of multiple codewords.

[0017] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, a second set of one or more values ​​of configuration coefficients may be provided via a message from the UE, and the message includes an indication of the number of sub-surfaces included in the reconfigurable surface.

[0018] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the message also includes an indication of whether the sub-surfaces included in a reconfigurable surface can be equal or unequal in size.

[0019] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, a second set of one or more values ​​for configuration coefficients of a reconfigurable surface includes a corresponding set of one or more values ​​for configuration coefficients of each of a set of multiple sub-surfaces included in the reconfigurable surface.

[0020] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the indication of a second set of values ​​for one or more configuration coefficients indicates one or more codebooks for each of a set of multiple sub-surfaces included in a reconfigurable surface, a corresponding combination coefficient for one or more codebooks, or both.

[0021] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the indication of a second set of one or more values ​​of configuration coefficients indicates the corresponding phase and corresponding amplitude of each value in the second set of one or more values ​​of configuration coefficients for each of the multiple sub-surfaces included in a set of reconfigurable surfaces.

[0022] A method for wireless communication at a network entity is described. The method may include: outputting an indication of a first set of one or more values ​​of configuration coefficients for a reconfigurable surface; outputting one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients; and obtaining an indication of a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based on transmitting the first set of the indication of the one or more values ​​of the configuration coefficients and transmitting the one or more reference signals.

[0023] An apparatus for wireless communication is described. The apparatus may include: a memory; and at least one processor of a network entity coupled to the memory. The at least one processor may be configured to: output an indication of a first set of one or more values ​​of configuration coefficients for a reconfigurable surface; output one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients; and obtain an indication of a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based on transmitting the first set of the indication of the one or more values ​​of the configuration coefficients and transmitting the one or more reference signals.

[0024] Another apparatus for wireless communication at a network entity is described. The apparatus may include: components for outputting an indication of a first set of one or more values ​​of configuration coefficients for a reconfigurable surface; components for outputting one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients; and components for obtaining an indication of a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based on transmitting the indication of the first set of one or more values ​​of the configuration coefficients and transmitting the one or more reference signals.

[0025] A non-transitory computer-readable medium is described, storing code for wireless communication at a network entity. The code may include instructions executable by a processor to: output an indication of a first set of one or more values ​​of configuration coefficients for a reconfigurable surface; output one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients; and obtain an indication of a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based on transmitting the first set of the one or more values ​​of the configuration coefficients and transmitting the one or more reference signals.

[0026] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for: outputting indications of one or more parameters for a communication link between a network entity and a reconfigurable surface, wherein the one or more parameters include propagation delay, propagation direction, transmission power, or any combination thereof, and wherein receiving indications of a second set of values ​​for one or more configuration coefficients may be based on transmitting indications of one or more parameters.

[0027] In some examples of the methods, apparatus, and nontransitory computer-readable media described herein, an indication of a first set of values ​​for one or more configuration coefficients includes an indication of a first mode for each element in a set of elements for activating or deactivating a reconfigurable surface, and an indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second mode for each element in a set of elements for activating or deactivating a reconfigurable surface.

[0028] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, an indication of a first set of values ​​for one or more configuration coefficients includes an indication of a first set of weight vectors, and an indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second set of weight vectors.

[0029] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the indication of a first set of weight vectors includes an indication of a first set of codeword indices, and the indication of a second set of weight vectors includes an indication of a second set of codeword indices.

[0030] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the indication of a first set of weight vectors includes an indication of the corresponding phase and corresponding magnitude of each element of each weight vector in the first set of weight vectors, and the indication of a second set of weight vectors includes an indication of the corresponding phase and corresponding magnitude of each element of each weight vector in the second set of weight vectors.

[0031] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, an indication of a second set of values ​​for one or more configuration coefficients indicates a codeword from a codebook.

[0032] Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for outputting an indication of whether a codeword may come from a first type of codebook or a second type of codebook.

[0033] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, a second set of one or more values ​​of configuration coefficients corresponds to a weighted sum of a set of multiple codewords, and an indication of the second set of one or more values ​​of configuration coefficients indicates a set of multiple codewords and a set of weights for obtaining the weighted sum of the set of multiple codewords.

[0034] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, a second set of one or more values ​​of configuration coefficients may be provided via a message, and the message includes an indication of the number of sub-surfaces included in the reconfigurable surface.

[0035] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the message also includes an indication of whether the sub-surfaces included in a reconfigurable surface can be equal or unequal in size.

[0036] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, a second set of one or more values ​​for configuration coefficients of a reconfigurable surface includes a corresponding set of one or more values ​​for configuration coefficients of each of a set of multiple sub-surfaces included in the reconfigurable surface.

[0037] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the indication of a second set of values ​​for one or more configuration coefficients indicates one or more codebooks for each of a set of multiple sub-surfaces included in a reconfigurable surface, a corresponding combination coefficient for one or more codebooks, or both.

[0038] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the indication of a second set of one or more values ​​of configuration coefficients indicates the corresponding phase and corresponding amplitude of each value in the second set of one or more values ​​of configuration coefficients for each of the multiple sub-surfaces included in a set of reconfigurable surfaces. Attached Figure Description

[0039] Figure 1 An example is shown of a wireless communication system that supports updating coefficients for reconfigurable surfaces in accordance with one or more aspects of this disclosure.

[0040] Figure 2 An example is shown of a wireless communication system that supports updating coefficients for reconfigurable surfaces in accordance with one or more aspects of this disclosure.

[0041] Figure 3 An example is shown of a wireless communication system that supports updating coefficients for reconfigurable surfaces in accordance with one or more aspects of this disclosure.

[0042] Figure 4 An example of a process flow supporting the updating of coefficients for reconfigurable surfaces is shown, according to one or more aspects of this disclosure.

[0043] Figure 5 and Figure 6 A block diagram is shown of a device for supporting the updating of coefficients for reconfigurable surfaces, according to one or more aspects of this disclosure.

[0044] Figure 7 A block diagram is shown that supports updating the communication manager for coefficients of a reconfigurable surface according to one or more aspects of this disclosure.

[0045] Figure 8 A diagram is shown of a system including a device for supporting the updating of coefficients for reconfigurable surfaces, according to one or more aspects of this disclosure.

[0046] Figure 9 and Figure 10 A block diagram is shown of a device for supporting the updating of coefficients for reconfigurable surfaces, according to one or more aspects of this disclosure.

[0047] Figure 11A block diagram is shown that supports updating the communication manager for coefficients of a reconfigurable surface according to one or more aspects of this disclosure.

[0048] Figure 12 A diagram is shown of a system including a device for supporting the updating of coefficients for reconfigurable surfaces, according to one or more aspects of this disclosure.

[0049] Figure 13 and Figure 14 A flowchart illustrating a method for updating coefficients for a reconfigurable surface in accordance with one or more aspects of this disclosure is shown. Detailed Implementation

[0050] User equipment (UE) can communicate with network entities. For example, a UE can communicate with a network entity via a direct link between the UE and the network entity. To enable the UE to better receive transmissions from the network entity, the UE can perform channel estimation for the direct link before receiving transmissions. In some examples, the UE and the network entity can communicate via a reflective link provided by a reconfigurable surface (e.g., a reconfigurable smart surface (RIS)) configured to reflect transmissions received from the UE and the network entity. In some such examples, the reconfigurable surface can be configured based on one or more values ​​of one or more configuration coefficients (e.g., one or more reflection or refraction coefficients) to direct transmissions from the network entity to the UE. To estimate the configuration coefficients, the UE can perform channel estimation and can provide the network entity with one or more values ​​of one or more configuration coefficients. However, if the UE performs channel estimation for receiving transmissions from the network entity and simultaneously configures one or more configuration coefficients, the resulting channel estimation may be inaccurate for receiving subsequent transmissions because the reconfigurable surface can adjust how it directs transmissions to the UE based on the indicated configuration coefficients.

[0051] The techniques described herein enable a UE to indicate to the network (e.g., as part of a Channel State Information (CSI) report) a set of proposed (e.g., optimized) values ​​for one or more configuration factors of a reconfigurable surface to support improved communication by which the UE uses the reconfigurable surface to reflect or refract signals. In some examples, the UE may be able to determine one or more values ​​for one or more configuration factors of the reconfigurable surface before performing channel estimation to receive control and / or data transmissions from a network entity via the reconfigurable surface.

[0052] For example, the UE can receive (e.g., via a direct link) an indication of a first set of values ​​for configuration coefficients from a network entity. The UE can also receive one or more reference signals via a reconfigurable surface, wherein the reconfigurable surface can be configured based on the first set of values ​​when the reference signals are transmitted. The UE can use the first set of configuration coefficient values ​​and the reference signals received from the network entity to determine a second set of configuration coefficient values. The UE can transmit the indication of the second set of configuration coefficient values ​​to the network entity and / or directly to the reconfigurable surface. In the example where the UE transmits the indication of the second set of values ​​to the network entity, the network entity can transmit another indication of the second set of values ​​to the reconfigurable surface. After the reconfigurable surface receives the second set of configuration coefficient values, the UE can perform channel estimation to receive control transmission and / or data transmission from the network entity. During channel estimation, the reconfigurable surface can use the second set of configuration coefficient values ​​to direct the reference signals to the UE.

[0053] The various aspects of this disclosure are first described in the context of a wireless communication system. Additional aspects of this disclosure are described in the context of process flow. The various aspects of this disclosure are further illustrated and described by reference to, and updating with, apparatus diagrams, system diagrams, and flowcharts relating to coefficients for reconfigurable surfaces.

[0054] Figure 1 An example of a wireless communication system 100 supporting updates for coefficients of a reconfigurable surface, according to one or more aspects of this disclosure, is shown. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating under other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

[0055] Network entity 105 may be distributed across a geographical area to form wireless communication system 100 and may include devices in different forms or with different capabilities. In various examples, network entity 105 may be referred to as a network element, mobility element, radio access network (RAN) node, or network equipment, among other names. In some examples, network entity 105 and UE 115 may wirelessly communicate via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, network entity 105 may support a coverage area 110 (e.g., a geographical coverage area) within which UE 115 and network entity 105 may establish one or more communication links 125. Coverage area 110 may be an example of a geographical area within which network entity 105 and UE 115 may support signal communication according to one or more radio access technologies (RATs).

[0056] UE 115 can be distributed throughout the coverage area 110 of wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. UE 115 can be a device in different forms or with different capabilities. Figure 1 Some example UE 115s are illustrated herein. The UE 115 described herein may be able to support various types of devices, such as... Figure 1 The other UE 115 or network entity 105 shown communicates.

[0057] As described herein, a node in the wireless communication system 100 (which may be referred to as a network node or wireless node) may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, apparatus, device, computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be UE 115. Alternatively, a node may be network entity 105. Alternatively, a first node may be configured to communicate with a second or third node. In one aspect of this example, the first node may be UE 115, the second node may be network entity 105, and the third node may be UE 115. In another aspect of this example, the first node may be UE 115, the second node may be network entity 105, and the third node may be network entity 105. In other aspects of this example, the first node, the second node, and the third node may be different from these examples. Similarly, references to UE 115, network entity 105, device, equipment, computing system, etc., may include disclosures of UE 115, network entity 105, device, equipment, computing system, etc., as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that a first node is configured to receive information from a second node.

[0058] In some examples, network entity 105 may communicate with core network 130, or network entity 105 may communicate with each other, or both. For example, network entity 105 may communicate with core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, network entity 105 may communicate with each other directly (e.g., directly between network entities 105) or indirectly (e.g., via core network 130) via backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, network entity 105 may communicate with each other via midhaul communication link 162 (e.g., according to midhaul interface protocol) or fronthaul communication link 168 (e.g., according to fronthaul interface protocol) or any combination thereof. The backhaul communication link 120, midhaul communication link 162, or fronthaul communication link 168 may be one or more wired links (e.g., electrical links, fiber optic links), one or more wireless links (e.g., radio links, wireless optical links), etc., or various combinations thereof, or may include one or more wired links (e.g., electrical links, fiber optic links), one or more wireless links (e.g., radio links, wireless optical links), etc., or various combinations thereof. The UE 115 may communicate with the core network 130 via communication link 155.

[0059] One or more network entities in network entity 105 described herein may include base station 140 or may be referred to as base station 140 (e.g., transceiver base station, radio base station, NR base station, access point, radio transceiver, Node B, evolved Node B (eNB), next-generation Node B or gigabit Node B (any of which may be referred to as gNB), 5G NB, next-generation eNB (ng-eNB), home Node B, home evolved Node B, or other suitable terms). In some examples, network entity 105 (e.g., base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture that may be configured to utilize a protocol stack physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as base station 140).

[0060] In some examples, network entity 105 may be implemented in a decomposed architecture (e.g., a decomposed base station architecture, a decomposed RAN architecture) that can be configured to utilize protocol stacks physically or logically distributed across two or more network entities 105 (such as an Integrated Access Backhaul (IAB) network, an Open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a Virtualized RAN (vRAN) (e.g., a Cloud RAN (C-RAN)). For example, network entity 105 may include one or more of the following: a Central Unit (CU) 160, a Distributed Unit (DU) 165, a Radio Unit (RU) 170, a RAN Intelligent Controller (RIC) 175 (e.g., a near-real-time RIC, a non-real-time RIC), a Service Management and Orchestration (SMO) 180 system, or any combination thereof. 170 may also be referred to as a radio headend, intelligent radio headend, remote radio headend (RRH), remote radio unit (RRU), or transmit / receive point (TRP). One or more components of network entity 105 in a decomposed RAN architecture may be co-located, or one or more components of network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 in a decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0061] The functional splitting among CU 160, DU 165, and RU 170 is flexible and can support different functions depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, or RU 170. For example, a protocol stack functional splitting can be used between CU 160 and DU 165, allowing CU 160 to support one or more layers of the protocol stack, and DU 165 to support one or more different layers of the protocol stack. In some examples, CU 160 can host higher protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functionality and signaling (e.g., Radio Resource Control (RRC), Serving Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). CU 160 can connect to one or more DU 165 or RU 170, and one or more DU 165 or RU 170 can host lower protocol layers, such as Layer 1 (L1) (e.g., Physical (PHY) layer) or L2 (e.g., Radio Link Control (RLC) layer, Medium Access Control (MAC) layer) functionality and signaling, and each can be at least partially controlled by CU 160. Additionally or alternatively, a protocol stack functional split can be employed between DU 165 and RU 170, such that DU 165 can support one or more layers of the protocol stack, and RU 170 can support one or more different layers of the protocol stack. DU 165 can support one or more different cells (e.g., via one or more RU 170). In some cases, functional decomposition between CU 160 and DU 165, or between DU 165 and RU 170, can be performed within the protocol layer (e.g., some functions of the protocol layer can be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer can be performed by different of CU 160, DU 165, or RU 170). CU 160 can be further functionally decomposed into CU control plane (CU-CP) and CU user plane (CU-UP) functions. CU 160 can be connected to one or more DU 165 via midhaul communication link 162 (e.g., F1, F1-c, F1-u), and DU 165 can be connected to one or more RU 170 via fronthaul communication link 168 (e.g., open fronthaul (FH) interface). In some examples, the midhaul communication link 162 or the fronthaul communication link 168 may be implemented based on the interfaces (e.g., channels) between the layers of the protocol stack, which are supported by the corresponding network entities 105 communicating via such communication links.

[0062] In some wireless communication systems (e.g., wireless communication system 100), the infrastructure and spectrum resources for radio access can support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB node 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors. One or more DU 165s or one or more RU 170s may be partially controlled by one or more CU 160s associated with donor network entity 105 (e.g., donor base station 140). One or more donor network entities 105 (e.g., IAB donors) may communicate with one or more additional network entities 105 (e.g., IAB node 104) via supported access and backhaul links (e.g., backhaul communication link 120). IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a DU 165 of a coupled IAB donor. The IAB-MT may include a separate set of antennas for relaying communication with UE 115, or may share the same antennas (e.g., those of RU 170) for access to IAB node 104 via DU 165 of IAB node 104. (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of IAB node 104) may be configured to operate according to the techniques described herein.

[0063] For example, the access network (AN) or RAN may include communication between an access node (e.g., an IAB donor), IAB node 104, and one or more UEs 115. The IAB donor may facilitate connectivity between the core network 130 and the AN (e.g., via a wired or wireless connection to the core network 130). That is, an IAB donor may refer to a RAN node having a wired or wireless connection to the core network 130. The IAB donor may include a CU 160 and at least one DU 165 (e.g., and RU 170), wherein the CU 160 may communicate with the core network 130 via an interface (e.g., a backhaul link). The IAB donor and IAB node 104 may communicate via an F1 interface according to a protocol defining the signaling messages (e.g., the F1 AP protocol). Additionally or alternatively, CU 160 may communicate with the core network via an interface (which may be part of a backhaul link) and may communicate with other CU 160s (e.g., CU 160 associated with an alternative IAB donor) via an Xn-C interface (which may be part of a backhaul link).

[0064] IAB node 104 may refer to a RAN node that provides IAB functionality (e.g., access for UE 115, radio self-backhaul capability, etc.). DU 165 may act as a distributed scheduling node toward child nodes associated with IAB node 104, and IAB-MT may act as a scheduled node toward a parent node associated with IAB node 104. That is, an IAB donor may be referred to as a parent node communicating with one or more child nodes (e.g., an IAB donor may be relayed for UE transmissions via one or more other IAB nodes 104). Additionally or alternatively, depending on the AN's relay chain or configuration, IAB node 104 may also be referred to as a parent node or child node of other IAB nodes 104. Therefore, the IAB-MT entity of IAB node 104 can provide a Uu interface for child IAB node 104 to receive signaling from parent IAB node 104, and the DU interface (e.g., DU 165) can provide a Uu interface for parent IAB node 104 to send signaling notifications to child IAB node 104 or UE 115.

[0065] For example, IAB node 104 may be referred to as a parent node supporting communication to child IAB nodes or as a child IAB node associated with an IAB donor, or both. An IAB donor may include a CU 160 having a wired or wireless connection to core network 130 (e.g., backhaul communication link 120) and may act as a parent node of IAB node 104. For example, the IAB donor's DU 165 may relay transmissions to UE 115 via IAB node 104, or may signal transmissions directly to UE 115, or both. The IAB donor's CU 160 may signal the establishment of a communication link to IAB node 104 via an F1 interface, and IAB node 104 may schedule transmissions via DU 165 (e.g., transmissions relayed from the IAB donor to UE 115). That is, data may be relayed to and from IAB node 104 via signaling through the NR Uu interface of the MT to IAB node 104. Communication with IAB node 104 can be scheduled by DU 165 of the IAB donor, and communication with IAB node 104 can be scheduled by DU 165 of IAB node 104.

[0066] In the context of applying the techniques described herein to a decomposed RAN architecture, one or more components of the decomposed RAN architecture can be configured to support updates for coefficients of reconfigurable surfaces as described herein. For example, some operations described as being performed by UE 115 or network entity 105 (e.g., base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., IAB node 104, DU 165, CU 160, RU 170, RIC 175, SMO 180).

[0067] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, wherein "device" may also be referred to as a cell, station, terminal, or client, etc. UE 115 may also include personal electronic devices or may be referred to as personal electronic devices, such as cellular phones, personal digital assistants (PDAs), tablet computers, laptop computers, or personal computers. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0068] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays, as well as network entities 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 As shown.

[0069] UE 115 and network entity 105 can wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" can refer to a set of RF spectrum resources that define the physical layer structure used to support the communication link 125. For example, a carrier for the communication link 125 may include a portion of the RF spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. The wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, UE 115 can be configured to have multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used for both frequency division duplex (FDD) and time division duplex (TDD) component carriers. Communication between network entity 105 and other devices can refer to communication between these devices and any part of network entity 105 (e.g., entity, sub-entity). For example, the terms “send,” “receive,” or “communicate” when referring to network entity 105 can refer to any part of the RAN’s network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) communicating with another device (e.g., directly or via one or more other network entities 105).

[0070] In some examples, such as in carrier aggregation configurations, a carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute RF Channel Number (EARFCN)) and may be identified according to a channel grating used for discovery by UE 115. A carrier may operate in standalone mode, in which case initial acquisition and connection can be made by UE 115 via that carrier, or the carrier may operate in non-standalone mode, in which case different carriers (e.g., the same or different radio access technologies) are used to anchor the connection.

[0071] The communication link 125 shown in the wireless communication system 100 may include downlink transmission (e.g., forward link transmission) from network entity 105 to UE 115, uplink transmission (e.g., return link transmission) from UE 115 to network entity 105, or both, as well as other transmission configurations. The carrier may carry downlink communication or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0072] A carrier may be associated with a specific bandwidth of the RF spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one bandwidth in a set of bandwidths for a particular radio access technology (e.g., 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, or 80 MHz). Devices of the wireless communication system 100 (e.g., network entity 105, UE 115, or both) may have hardware configurations that support communication using a specific carrier bandwidth, or may be configured to support communication using one of the carrier bandwidths in the set of carrier bandwidths. In some examples, the wireless communication system 100 may include network entity 105 or UE 115 that supports concurrent communication using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate using a portion (e.g., subband, BWP) or all of the carrier bandwidth.

[0073] The signal waveform transmitted via a carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the decoding rate of the modulation scheme, or both), such that a relatively high number of resource elements (e.g., in the transmission duration) and a relatively high-order modulation scheme can correspond to a relatively high communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial resources can increase the data rate or data integrity used for communication with UE 115.

[0074] One or more parameter sets for a carrier can be supported, and the parameter sets may include subcarrier spacing (Δf) and cyclic prefix. A carrier can be divided into one or more BWPs with the same or different parameter sets. In some examples, the UE 115 can be configured with multiple BWPs. In some examples, a single BWP of a carrier can be active at a given time, and the communication of the UE 115 can be constrained to one or more active BWPs.

[0075] The time interval for network entity 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period T. s =1 / (Δf) max ·N f ) seconds, where Δf max This can represent the supported subcarrier spacing, while N f The supported Discrete Fourier Transform (DFT) size can be represented. The time interval of the communication resources can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0076] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix appended to each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., N) symbols. f The duration of a symbol period is associated with a (number) sampling period. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0077] A subframe, time slot, micro-time slot, or symbol may be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and may be referred to as a Transmission Time Interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0078] Physical channels can be multiplexed using various techniques to enable communication using carriers. For example, one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used to multiplex physical control channels and physical data channels for signaling via downlink carriers. The control region of a physical control channel (e.g., a control resource set (CORESET)) can be defined by a set of symbol periods and can extend across the system bandwidth of a carrier or a subset of that bandwidth. One or more control regions (e.g., CORESETs) can be configured for a set of UEs 115. For example, one or more UEs in UE115 can monitor or search control regions to obtain control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a concatenated manner. The aggregation level of control channel candidates can refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space set may include: a common search space set configured to transmit control information to multiple UEs 115, and a UE-specific search space set used to transmit control information to a specific UE 115.

[0079] Network entity 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used (e.g., using a carrier) to communicate with network entity 105 and may be associated with an identifier used to distinguish adjacent cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or other identifier). In some examples, a cell may also refer to a coverage area 110 or a portion of coverage area 110 (e.g., a sector) on which a logical communication entity operates. Depending on various factors such as the capabilities of network entity 105, the range of such cells may be from smaller areas (e.g., structures, subsets of structures) to larger areas. For example, a cell may be a building, a subset of buildings, or external space between or overlapping coverage areas 110, or may include buildings, subsets of buildings, or external space between or overlapping coverage areas 110.

[0080] Macro cells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access to UE 115 that has a service subscription with a network provider supporting the macro cell. In contrast, small cells may be associated with a lower-power network entity 105 (e.g., a lower-power base station 140) and may operate using the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to UE 115 that has a service subscription with a network provider, or restricted access to UE 115 associated with a small cell (e.g., UE 115 in a Closed Subscriber Group (CSG), or UE 115 associated with a user in a home or office). Network entity 105 may support one or more cells and may also use one or more component carriers to support communication via one or more cells.

[0081] In some examples, a carrier can support multiple cells and can be configured with different cells based on different protocol types that can provide access for different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0082] In some examples, network entity 105 (e.g., base station 140, RU 170) may be mobile, and thus provide communication coverage to mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 use the same or different radio access technologies to provide coverage for various coverage areas 110.

[0083] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, network entities 105 (e.g., base station 140) can have similar frame timings, and transmissions from different network entities 105 can be approximately time-aligned. For asynchronous operation, network entities 105 can have different frame timings, and in some examples, transmissions from different network entities 105 may not be time-aligned. The techniques described herein can be used for both synchronous and asynchronous operation.

[0084] Some UE 115s (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with network entity 105 (e.g., base station 140) without human intervention. In some examples, M2M communication or MTC may include communication from devices with integrated sensors or meters to measure or acquire information and relay such information to a central server or application that uses the information or presents it to people interacting with the application. Some UE 115s may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0085] Some UE 115s can be configured to operate in a power-saving mode, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but does not transmit and receive concurrently). In some examples, a reduced peak rate can be used to perform half-duplex communication. Other power-saving techniques for UE 115s include: entering a power-saving deep sleep mode when not engaged in active communication, operating with limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UE 115s can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a carrier's guard band, or outside a carrier.

[0086] Wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). UE 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communication may include private or group communication and may be supported by one or more services, such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritizing services, and such services may be used for public safety or general business applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

[0087] In some examples, UE 115 may be configured to support direct communication with other UE 115s via device-to-device (D2D) communication link 135 (e.g., according to peer-to-peer (P2P), D2D, or sidelink protocols). In some examples, one or more UE 115s performing D2D communication in a group may be within the coverage area 110 of network entity 105 (e.g., base station 140, RU 170), which may support aspects of such D2D communication configured (e.g., scheduled by network entity 105). In some examples, one or more UE 115s in such a group may be outside the coverage area 110 of network entity 105, or may otherwise be unable or not configured to receive transmissions from network entity 105. In some examples, the group of UE 115s communicating via D2D communication may support a one-to-many (1:M) system, where each UE 115 transmits to each of the other UE 115s in the group. In some examples, network entity 105 may facilitate the scheduling of resources used for D2D communication. In other examples, D2D communication may be performed between UEs 115 without involving network entity 105.

[0088] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-vehicle (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. Vehicles may use signal notifications to communicate information related to traffic conditions, signal control, weather, safety, emergencies, or any other information relevant to the V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure (such as roadside units), or communicate with the network via one or more network nodes (e.g., network entity 105, base station 140, RU 170) using vehicle-to-network (V2N) communication, or both.

[0089] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), and may include at least one control plane entity (e.g., a Mobility Management Entity (MME), Access and Mobility Management Function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a Serving Gateway (S-GW), Packet Data Network (PDN) Gateway (P-GW), or User Plane Function (UPF)) for routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by network entity 105 (e.g., base station 140) associated with core network 130. User IP packets can be transferred through user plane entities, which provide IP address allocation and other functions. User plane entities may connect to one or more network operator IP services 150. IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0090] Wireless communication system 100 can operate using one or more frequency bands in the range of 300 MHz to 300 GHz. Generally, the region from 300 MHz to 3 GHz is referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range is approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features (which may be referred to as clusters), but these waves are sufficient to penetrate structures so that macrocells can provide service to UE 115 located indoors. Compared to communication using smaller frequencies and longer wavelengths in the lower frequencies (HF) or very high frequencies (VHF) portions of the spectrum below 300 MHz, communication using UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0091] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) region (also known as the centimeter band) ranging from 3 GHz to 30 GHz or in the extremely high frequency (EHF) region (e.g., 30 GHz to 300 GHz) (also known as the millimeter band) using the spectrum. In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and network entity 105 (e.g., base station 140, RU 170), and the EHF antennas of the corresponding devices can be smaller and more closely spaced than UHF antennas. In some examples, such techniques facilitate the use of antenna arrays within the device. However, compared to SHF or UHF transmissions, EHF transmissions may experience even greater attenuation and shorter range. The techniques disclosed herein can be adopted for transmissions using one or more different frequency regions, and the frequency band usage specified across these frequency regions may vary by country or regulatory authority.

[0092] Wireless communication system 100 may utilize licensed and unlicensed RF spectrum bands. For example, wireless communication system 100 may use unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band) to employ Licensed Assisted Access (LAA), LTE Unlicensed (LTE-U) radio access technology, or NR technology. When operating using unlicensed RF spectrum bands, devices such as network entity 105 and UE 115 may employ carrier sensing for collision detection and avoidance. In some examples, operation using unlicensed frequency bands may be combined with component carriers operating using licensed frequency bands based on carrier aggregation configurations (e.g., LAA). Operations using unlicensed spectrum may include downlink transmission, uplink transmission, P2P transmission, or D2D transmission, etc.

[0093] Network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of network entity 105 or UE 115 may be located within one or more antenna arrays or antenna panels, which can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with network entity 105 may be located at different geographical locations. Network entity 105 may include an antenna array having a collection of multiple rows and columns of antenna ports that network entity 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may include one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals transmitted via the antenna ports.

[0094] Network entity 105 or UE 115 can use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. This technique is known as spatial multiplexing. The multiple signals can be transmitted, for example, by a transmitting device via different antennas or different combinations of antennas. Similarly, the multiple signals can be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals can be referred to as a separate spatial stream and can carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include: single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0095] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., network entity 105, UE 115) to shape or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating in a particular direction relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include applying amplitude shifts, phase shifts, or both to the signals carried via the antenna elements associated with the device. The adjustments associated with each of these antenna elements may be defined by a beamforming weight set associated with a particular direction (e.g., relative to the antenna array of the transmitting or receiving device or relative to some other direction).

[0096] Network entity 105 or UE 115 may use beam scanning technology as part of beamforming operations. For example, network entity 105 (e.g., base station 140, RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by network entity 105 in different directions. For example, network entity 105 may transmit signals according to different beamforming weight sets associated with different transmission directions. Transmission along different beam directions may be used to identify (e.g., by a transmitting device (such as network entity 105) or by a receiving device (such as UE 115)) the beam direction for later transmission or reception by network entity 105.

[0097] Some signals (such as data signals associated with a specific receiving device) may be transmitted by a transmitting device (e.g., transmitting network entity 105, transmitting UE 115) along a single beam direction (e.g., the direction associated with the receiving device (such as receiving network entity 105 or receiving UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on the signals transmitted along one or more beam directions. For example, UE 115 may receive one or more signals transmitted by network entity 105 in different directions and may report to network entity 105 an indication of signals received by UE 115 with the highest signal quality or other acceptable signal quality.

[0098] In some examples, transmissions performed by a device (e.g., by network entity 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital pre-decoding or beamforming to generate a combined beam for transmission (e.g., from network entity 105 to UE 115). UE 115 may report feedback indicating pre-decoding weights for one or more beam directions, and this feedback may correspond to a configured beam set across the system bandwidth or one or more subbands. Network entity 105 may transmit reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)) that may or may not be pre-decoded. UE 115 may provide feedback for beam selection, which may be a pre-decoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel codebook, linear combination codebook, port selection codebook). Although these techniques are described with reference to signals transmitted by network entity 105 (e.g., base station 140, RU 170) in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception), or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0099] A receiving device (e.g., UE 115) may perform reception operations according to multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a receiving device (e.g., network entity 105). For example, the receiving device may perform reception according to multiple reception directions by: receiving via different antenna subarrays; processing the received signals according to different antenna subarrays; receiving according to different sets of reception beamforming weights (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of the antenna array; or processing the received signals according to different sets of reception beamforming weights applied to signals received at multiple antenna elements of the antenna array, any of which may refer to “listening” according to different reception configurations or reception directions. In some examples, the receiving device may use a single reception configuration to receive along a single beam direction (e.g., when a data signal is received). A single receiver configuration can be aligned along a beam direction determined based on listening according to different receiver configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0100] The wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or PDCP layer may be IP-based. The RLC layer may perform packet segmentation and reassembly for communication via logical channels. The MAC layer may perform priority handling and multiplexing of logical channels to transport channels. The MAC layer may also implement error detection, error correction, or both to support retransmission, thereby improving link efficiency. In the control plane, the RRC layer may provide the establishment, configuration, and maintenance of RRC connections between the UE 115 and network entity 105 or core network 130 supporting user plane data radio bearers. The PHY layer may map transport channels to physical channels.

[0101] UE 115 and network entity 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correctly receiving data via communication links (e.g., communication link 125, D2D communication link 135). HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device may support same-slot HARQ feedback, in which case the device may provide HARQ feedback in a specific time slot for data received via a previous symbol in that time slot. In some other examples, the device may provide HARQ feedback in subsequent time slots or according to a different time interval.

[0102] UE 115 can communicate with network entity 105. For example, UE 115 can communicate with network entity 105 via a direct link between UE 115 and network entity 105. To enable UE 115 to better receive transmissions from network entity 105, UE 115 can perform channel estimation for the direct link before receiving transmissions. In some examples, UE 115 and network entity 105 can communicate via a reflective link provided by a reconfigurable surface (e.g., a reconfigurable smart surface), which is configured to reflect transmissions received from UE 115 and network entity 105. In some such examples, the reconfigurable surface can be configured according to one or more configuration factors (e.g., one or more reflection or refraction factors) to direct transmissions from network entity 105 to UE 115. To estimate the configuration factors, UE 115 can perform channel estimation and can provide network entity 105 with the values ​​of one or more configuration factors. However, if UE 115 performs channel estimation for receiving transmissions from network entity 105 and simultaneously configures one or more configuration factors, the resulting channel estimation may be inaccurate for receiving subsequent transmissions, because the reconfigurable surface can adjust how it directs transmissions to UE 115 based on the indicated configuration factors.

[0103] The techniques described herein enable UE 115 to determine one or more configuration coefficients before performing channel estimation to receive control and / or data transmissions from network entity 105. For example, UE 115 may receive (e.g., via a direct link) an indication of a first set of values ​​for one or more configuration coefficients from network entity 105, wherein when the indication of the first set of values ​​for one or more configuration coefficients is transmitted, the first set of values ​​for one or more configuration coefficients may be a set of values ​​for one or more configuration coefficients configured at a reconfigurable surface. UE 115 may use the first set of values ​​for one or more configuration coefficients and a reference signal received from network entity 105 (e.g., via a reflective link and / or a direct link) to determine a second set of values ​​for one or more configuration coefficients. UE 115 may transmit the indication of the second set of values ​​for one or more configuration coefficients to network entity 105 and / or directly to the reconfigurable surface. In an example where UE 115 transmits the indication of the second set of values ​​to network entity 105, network entity 105 may transmit another indication of the second set of values ​​to the reconfigurable surface. After the reconfigurable surface receives a second set of configuration coefficient values, UE 115 can perform channel estimation to receive control transmissions and / or data transmissions from network entity 105. During channel estimation, the reconfigurable surface can use a second set of one or more configuration coefficient values ​​to direct reference signals to UE 115.

[0104] Figure 2 An example of a wireless communication system 200 supporting updates for coefficients of a reconfigurable surface according to one or more aspects of this disclosure is shown. The wireless communication system 200 may implement, or be implemented by, aspects of the wireless communication system 100. For example, the wireless communication system 200 may include network entities 105-a and UE 115-a, which may be references... Figure 1 An example of the corresponding device described. In the wireless communication system 200, UE 115-a can communicate with network entity 105-a via RIS210.

[0105] In some examples, RIS210 can be controlled by network entity 105-a. For example, network entity 105-a can control RIS210 via interface 250. In other examples, RIS210 can be controlled by a central RIS controller. RIS210 can be used to relay (e.g., deflect, refract, reflect) signals between network entity 105-a and UE 115-a. For example, a wave (e.g., incident wave) can be relayed at an angle of incidence (e.g., θ). i ) to RIS210, and can be reached at a reflection angle (e.g., θ) rThe electromagnetic wave can exit the RIS 210 (e.g., as a reflected wave). In some examples, the RIS 210 may be a surface with a number of densely placed reconfigurable elements that can reflect or refract electromagnetic waves in the target direction.

[0106] The RIS210 can be configured with a controller 205 that can adjust or otherwise configure the orientation settings of the RIS210. For example, the controller 205 can adjust the grating 220 on the RIS210 to control the angle at which waves are reflected from the RIS210. By adjusting the grating 220 of the RIS210, the controller 205 may be able to guide waves (e.g., signals) in a specific direction. In some examples, the controller 205 may provide a small amount of power to the surface of the RIS210 to improve the reflection characteristics of the RIS210 (e.g., to increase the power or quality of the signal reflected by the RIS210). The amount of power consumed by the RIS210 is negligible compared to a power amplifier or other active repeater device.

[0107] In some examples, a reflection link may exist between UE 115-a and network entity 105-a via RIS210. In some such examples, a direct link (e.g., a direct communication link) between UE 115-a and network entity 105-a may not be established and / or maintained. For example, the direct link may be blocked by an object (e.g., a building, a tree). In other examples, a direct link and a reflection link may be established and / or maintained (e.g., the direct link is not blocked by an object). In some examples, network entity 105-a and / or UE 115-a may estimate the channel for a portion of the reflection link between RIS210 and network entity 105-a as a channel estimation coefficient H. gr Additionally, network entity 105-a and / or UE 115-a can estimate the channel used for a portion of the reflection link between RIS210 and UE 115-a as channel estimation coefficient H. ru Additionally or alternatively, network entity 105-a and / or UE 115-a may estimate the channel for the direct link between UE 115-a and network entity 105-a as channel estimation coefficient H. gu Additionally, network entity 105-a and / or UE 115-a can generate a reflection coefficient vector w for RIS210. r Furthermore, the pre-decoding weight matrix W for network entity 105-a to transmit downlink data can be determined. g It should be noted that the techniques described in this paper can be performed regardless of whether downlink-uplink reciprocity is assumed.

[0108] When network entity 105-a transmits a signal from transmitting antenna m and UE 115-a receives the signal only through the reflection link, the signal received by UE 115-a from antenna m can be determined as y. m =H ru *Diag(w r )*H gr (:,m)x+noise=H ru *Diag(H gr (:,m))*w r x+noise, where Diag can represent the diagonal matrix generated for a given input, and x can represent the signal sent by network entity 105-a. If Then y m =A m w r x+noise. When network entity 105-a transmits pre-decoded signals from each transmit antenna, the received signal at UE 115-a can be given as

[0109] Alternatively, when network entity 105-a transmits a signal from transmitting antenna m and UE 115-a receives the signal via a reflection link and a direct link, the signal received by UE 115-a from antenna m can be determined as if and but When network entity 105-a transmits pre-decoded signals from each transmit antenna, the received signal at UE 115-a can be given as follows:

[0110] In some examples, multiple measurements with different RIS coefficients (e.g., reflection or refraction coefficients) can be performed. For example, when the transmit antenna m of network entity 105-a transmits a signal, different w values ​​can be used. r,t Perform T measurements (e.g., y) m,t =A m w r,t x t +nose, t = 1 ~ T). In some such examples, Furthermore, for the transmitting antenna m, the aggregated measurement channel

[0111] In some examples, network entity 105-a and / or UE 115-a can perform one or more methods for channel estimation. In a first example, per-element on / off can be performed. For example, each element of the RIS can be individually turned on or off. Therefore, when the RIS is configured to turn on each element, w can be derived. t,t =[0,…,0,1,0,…,0] T and A m The corresponding column. In the second example, based on the least squares (LS) criterion, A m It can be estimated as In such examples, to achieve matrix inversion, rank(B) = N, where K ≥ N. r In some examples, when N r The minimum criterion can be applied when the value is small (e.g., below a predefined threshold). In the third example, channel estimation can be performed based on compressed sensing (CS). For example, a sparse channel model can be assumed, where the radio channel has sparse paths. In such examples, the channel can be modeled such that... and in It can have an incident direction at RIS210. The guiding vector, It can have a receiving direction at UE 115-a The guiding vector, and It can have a reflection direction at RIS210. The guiding vector. In this type of example, for the transmitting antenna m, in Here, ⊙ signifies element-wise product. In some such examples, there may be KL virtual paths, each of which corresponds to a path pair. therefore, Where p j =γ k(j) β l(j) To ensure convergence, different values ​​of w can be used from T=1 to T. r,t Multiple measurements. In some examples, CS can be used if a small number of variables are used (e.g., less than a threshold number of variables). In some examples, the RIS incident direction in a portion of the reflection link between network entity 105-a and RIS210 can be determined during the prediction. Therefore, in some such examples, Additionally or alternatively, in some examples, network entity 105-a, UE 115-a, and RIS210 may all be located in the horizontal plane, and a one-dimensional orientation may be considered. In such examples,

[0112] In some examples, performing per-element on-off switching for channel estimation can be associated with reduced processing costs compared to other techniques and can robustly adapt to a variety of topology and conditions. Additionally or alternatively, performing LS for channel estimation can robustly adapt to a variety of topology and conditions and can have increased receiver signal strength compared to other techniques. Additionally or alternatively, performing CS for channel estimation can be associated with reduced radio resource consumption compared to other techniques, and the number of measurements performed can be less than the total number of RIS elements. In some examples, CS can be performed in instances where the number of RIS elements is increased, and LS and / or per-element on-off switching can be performed in instances where the number of RIS elements is decreased. In some examples, LS can be performed when the signal received from a single RIS element will have insufficient power for channel estimation, and / or per-element on-off switching can be performed when the signal will have sufficient power for channel estimation.

[0113] This disclosure describes techniques for network entity 105-a, UE 115-a, and RIS210 to employ protocols and signaling to estimate RIS channels (e.g., reflected link channels). Additionally, this disclosure describes techniques for channel estimation for reflected link channels and direct link channels.

[0114] For example, network entity 105-a can (e.g., via a direct link) send a first set 215 of configuration coefficient values ​​to UE 115-a. As described herein, UE 115-a can use In order to perform channel estimation (e.g., when network entity 105-a is transmitting one or more reference signals 235). For channel estimation utilizing per-element on / off switching, w r,t =[0,…,0,1,0,…,0] T , t = 1 to T. Therefore, for each element's on / off method, It can be used as a per-element on / off mode for RIS. For LS-based and CS-based channel estimation as described in this paper, Different vectors may be included. As described herein, when network entity 105-a sends a first set 215 of configuration coefficient values, network entity 105-a may indicate information about the RIS reflection coefficient vector B associated with a RIS-related reference signal (e.g., CSI-RS) to one or both of RIS 210 and / or UE 115-a. For example, network entity 105-a may configure a set of RIS-related reference signal resources or ports, each of which corresponds to a RIS reflection coefficient vector.

[0115] As described herein, in some examples, the information about the RIS reflection coefficient vector (e.g., a first set 215 of configuration coefficient values) may be a RIS per-element on / off mode indicating the order in which each RIS element is turned on / off sequentially. In some cases, groups of elements of RIS 210 may share the same control, and in such cases, the information may indicate the order in which each group of RIS elements is turned on or off sequentially. For example, the RIS per-element on / off mode may be a row-first mode (e.g., where each column is traversed for a row before proceeding to the next row, and where this is performed for each row) or a column-first mode (e.g., where each row is traversed for a column before proceeding to the next column, and where this is performed for each column). In other examples, the information about the RIS reflection coefficient vector may be an indicator of a set of RIS reflection weight vectors. In some such examples, the codebook (e.g., a Discrete Fourier Transform (DFT) matrix) for the RIS reflection weight vectors may be configured or pre-configured via signaling (e.g., from network entity 105-a). For example, a message including a first set 215 of configuration coefficient values ​​may include a set of indices of codewords in the codebook. Additionally or alternatively, the message including the first set 215 of configuration coefficient values ​​may include an indication of the phase and / or amplitude of each element in each RIS reflection weight vector. Whether the information is a per-element on / off mode for RIS or a set of RIS reflection weight vectors can be configured by network entity 105-a. In some such examples, the first set 215 of configuration coefficient values ​​may be in an RRC signaling message (e.g., a CSI report configuring RRC signaling message), a MAC CE message, or a downlink control information (DCI) message.

[0116] In some examples (e.g., if RIS210 is statically deployed), channel estimation for a portion of the reflected link between network entity 105-a and UE 115-a can be performed before the first set 215 of configuration coefficient values ​​is sent. In such examples, network entity 105-a can (e.g., via a direct link) indicate this information to UE 115-a to assist UE 115-a in channel estimation. The indicated information may include delay, azimuth angles (departure azimuth, arrival azimuth, arrival zenith angle, departure zenith angle), the power of the set of radio signal propagation paths in the portion of the reflected link between network entity 105-a and RIS210, or any combination thereof. In some examples, this information can be delivered in an RRC signaling message (e.g., a CSI report configuration RRC signaling message), a MAC CE message, or a DCI. In some examples, network entity 105-a can suppress the transmission of this information to UE 115-a before the first set 215 of configuration coefficient values ​​is sent (e.g., in examples where RIS210 is not statically deployed).

[0117] After sending the first set 215 of configuration coefficient values, network entity 105-a may (e.g., via a reflection link) send one or more reference signals 235 to RIS 210. RIS 210 may reflect the one or more reference signals 235 into one or more reference signals 230 and may provide one or more reference signals 230 to UE 115-a. In some examples, RIS 210 may utilize an associated reflection coefficient vector to reflect the reference signal for each resource and / or port.

[0118] After UE 115-a receives one or more reference signals 230, UE 115-a may send a second set 225 of configuration coefficient values ​​to network entity 105-a. For example, after receiving a RIS-related reference signal, UE 115-a may perform channel estimation based on information of the received RIS reflection coefficient vector (e.g., a first set 215 of configuration coefficient values) and reference signals (e.g., one or more reference signals 230).

[0119] After receiving the first set 215 of configuration coefficient values ​​and / or channel information associated with a portion of the reflection link between network entity 105-a and RIS210, UE 115-a can estimate the channel matrix for the RIS reflection link. Or the channel matrix for both RIS reflection links and direct links. After determining the channel matrix, UE115-a can determine the RIS reflection coefficient vector w. r (e.g., the optimal RIS reflection coefficient vector) and / or the corresponding network entity pre-decoding matrix W gIn some examples (e.g., where only reflection links are considered to perform channel estimation), Can be exported as if in but It can be the principal singular vector of A. In some examples (e.g., where channel estimation is performed considering both reflected and direct links), if in but It can be The principal singular vector. When multiple subbands exist, A or This could be the average of each sub-band within the sub-band. In some examples, UE 115-a can quantize and report based on a configured or pre-configured RIS reflection coefficient codebook.

[0120] In the first such example, UE 115-a can report using a Type 1 codebook. (For example, updated RIS reflection coefficients). The size of the Type 1 codebook for RIS can be... Each c n It is a candidate codeword, and N c This is the total number of codewords in the codebook. UE 115-a can obtain this information from the codebook. Select and report with The codeword with the largest covariance coefficient. In some examples, codebook construction can use RIS incident angles. and reflection angle As a codeword index (e.g., based on a sine function). For example, in This refers to the Kronecker product. In such examples, l1, l2, l3, and l4 can each be derived from n. Because and In some examples, and Each of these can be configured by network entity 105-a. In other examples, codebook construction (e.g., based on a DFT matrix) can use the sum of two sine function values ​​as codeword indices. For example, In such examples, l1 and l2 can be derived from n. Because -2 <x,y<2, and In some examples, and Each of these can be configured by network entity 105-a. The codewords described herein can be used in 3D radio channels, where θ or x can represent the horizontal angle, while Or y can represent a vertical angle. For 2D radio channels, it can be removed. Related or y-related entries.

[0121] In the second such example, UE 115-a can report using a Type 2 codebook. (For example, updated RIS reflection coefficients). For example, UE 115-a can determine that codewords in a Type 1 codebook do not have sufficient accuracy and / or precision to report. And therefore, a type 2 codebook can be used. A type 2 codebook can be constructed as a weighted sum of multiple codewords from a type 1 codebook (e.g., as described herein). or In some such examples, UE 115-a may be represented as W sel =[w r,sel1 ,w r,sel2 ,…,w r,sek,L L codewords. For example, based on A or eigenvectors w r,sel,l It can be In and e l The codeword with the highest correlation coefficient. After selecting L codewords, UE 115-a can determine the combination coefficients α = [α1, α2, ..., α...]. L ] T For example, UE 115-a can be based on AW. sel One or more principal singular vectors are used to make the determination. In some examples, UE115-a can report the index of the selected codeword, as well as the quantization magnitude and phase of α. If Assuming the RIS reflection coefficient has a constant modulus, after network entity 105-a receives the second set 225 of configuration coefficient values, network entity 105-a can use... As the RIS reflection coefficient vector used for control transmission and / or data transmission (e.g., Physical Downlink Control Channel (PDCCH) transmission and / or Physical Downlink Shared Channel (PDSCH) transmission), where . / signifies element-wise division. In some examples, UE 115-a reports whether it uses a Type 1 codebook or a Type 2 codebook. It can be configured by network entity 105-a, or determined and indicated by UE 115-a.

[0122] When Hgr and H ru When multiple paths exist, the RIS210 can reflect signals from multiple incident directions and / or multiple reflection directions, which can increase spatial multiplexing and obtain diversity gain. If UE 115-a (e.g., based on channel estimation results) detects multiple (e.g., denoted as N) paths in the RIS reflection link... p If a propagation path is defined, UE 115-a can determine that the RIS surface is divided into multiple sub-surfaces, each of which corresponds to a RIS reflection link propagation path. If, based on channel estimation results based on compressed sensing, there are multiple dominant path powers that are larger than other path powers (e.g., a large threshold amount), then each of the path power and its associated RIS incident / reflection direction can correspond to a RIS sub-surface. In some examples, the RIS surface can be divided uniformly (e.g., each sub-surface can be the same size) or non-uniformly (e.g., each sub-surface can be of different sizes). Whether the RIS surface is divided uniformly or non-uniformly can be configured by network entity 105-a. For each sub-surface, UE 115-a can determine the RIS reflection coefficient vector based on the corresponding RIS incident direction, the corresponding RIS reflection direction, a Type 1 codebook, a Type 2 codebook, or any combination thereof. In some examples, UE 115-a can determine the corresponding coefficients for each sub-surface. Therefore, UE 115-a can determine the aggregated reflection coefficient vector for the entire RIS in the following form:

[0123] In some examples, UE 115-a can report whether a Type 1 codebook or a Type 2 codebook is used. Indication; Number of sub-surfaces N p ; RIS surface splitting results (e.g., whether the RIS surface splitting is uniform or non-uniform); for The index of the selected codeword (e.g., if using a Type 1 codebook); for The index of the selected codeword and its combination coefficients (e.g., if using a Type 2 codebook); coefficients per sub-surface The amplitude and phase. In some examples, whether to use a Type 1 codebook or a Type 2 codebook for reporting. And / or N can be reported in the first part of the message (e.g., part 1 of a CSI report). p Furthermore, the remaining information can be reported in the second part of the message (e.g., part 2 of a CSI report).

[0124] In some examples, UE 115-a can generate a pre-decoding matrix W. gIn determining w r Then, W can be determined based on the codebook (e.g., the NR codebook). g For example, the equivalent channel matrix for a RIS reflection link. (For example, assuming the direct link is blocked), or the equivalent channel matrix for both the RIS reflection link and the direct link. UE 115-a can utilize codebooks (e.g., NR codebooks) based on and / or Report the broadband W of the subband g In some examples, w can be reported together or separately. r and W g .

[0125] In some examples, the techniques described herein enable UE 115-a to determine RIS coefficients and report the coefficient values ​​to network entity 105-a. In some examples, the techniques described herein enable UE 115-a to determine RIS reflection coefficients as part of an equivalent channel, which is subsequently used to perform channel estimation on a composite channel. Additionally, different RIS coefficients can result in different equivalent channels and different equivalent channel gains. To increase (e.g., maximize) the equivalent channel gain, UE 115-a can determine updated RIS reflection coefficients (e.g., optimal RIS reflection coefficients) before performing channel estimation on the composite channel. For example, UE 115-a can estimate per-link channels (e.g., one for a reflection link and one for a direct link) and can compute RIS reflection coefficients. UE 115-a can then use the computed RIS reflection coefficients to estimate the composite (e.g., equivalent) channel and compute CSI.

[0126] In some examples, the first set 215 of configuration coefficient values ​​may be auxiliary coefficients used to receive one or more reference signals 230 during each link channel estimation. Using the received reference signals, UE 115-a can determine a second set 225 of configuration coefficient values ​​(e.g., w r And it can send a second set 225 of configuration coefficient values ​​to network entity 105-a. In some examples, it is used to report w r The codebook can be different from other codebooks used for transmission and can be associated with higher performance (e.g., due to the combination of signal reflection, incident direction, and outgoing direction).

[0127] Figure 3An example of a wireless communication system 300 supporting updates for coefficients of a reconfigurable surface according to one or more aspects of this disclosure is shown. The wireless communication system 300 may implement, or be implemented by, aspects of, wireless communication systems 100 and / or 200. For example, the wireless communication system 300 may include network entities 105-b and UE 115-b, which may be references... Figure 1 and / or Figure 2 Examples of the corresponding devices described. Similarly, the RIS210-a, controller 205-a, and interface 250-a can be as shown in the reference. Figure 2 Examples of the corresponding devices and / or components described. In the wireless communication system 300, UE 115-b can communicate with network entity 105-b via RIS210-a.

[0128] As described herein, a reflection link may exist between UE 115-b and network entity 105-b via RIS210-a. In some such examples, a direct link (e.g., a direct communication link) between UE 115-b and network entity 105-b may not be established and / or maintained. For example, the direct link may be blocked by an object (e.g., a building, a tree). In other examples, a direct link and a reflection link may be established and / or maintained (e.g., the direct link is not blocked by an object). In some examples, network entity 105-b and / or UE 115-b may estimate the channel for a portion of the reflection link between RIS210-a and network entity 105-b as a channel estimation coefficient H. gr Additionally, network entity 105-b and / or UE 115-b can estimate the channel used for a portion of the reflection link between RIS210-a and UE 115-b as channel estimation coefficient H. ru Additionally or alternatively, network entity 105-b and / or UE 115-b may estimate the channel for the direct link between UE 115-b and network entity 105-b as channel estimation coefficient H. gu Additionally, network entity 105-b and / or UE 115-b can generate a reflection coefficient vector w for RIS210-a. r Furthermore, the pre-decoding weight matrix W for network entity 105-b to transmit downlink data can be determined. g .

[0129] In some examples, UE 115-b may (e.g., via a direct link) receive a first set of values ​​for one or more configuration coefficients (e.g., w) from network entity 105-b. rThe instruction, wherein when sending an instruction for a first set of values ​​for one or more configuration coefficients, may be a set of values ​​for one or more configuration coefficients configured at RIS210-a. UE 115-b may use the first set of values ​​for one or more configuration coefficients and reference signals received from a network entity (e.g., via a reflected link and / or a direct link) to determine a second set of values ​​for one or more configuration coefficients (e.g., ...). UE 115-b may send an indication of a second set of values ​​for one or more configuration coefficients to network entity 105-b and / or directly to RIS210-a. In the example where UE 115-b sends an indication of the second set of values ​​to network entity 105-b, network entity 105-b may send another indication of the second set of values ​​to RIS210-a. After RIS210-a receives the second set of configuration coefficient values, UE 115-b may perform channel estimation to receive control transmissions and / or data transmissions from network entity 105-b. During channel estimation, RIS210-a may use the second set of values ​​for one or more configuration coefficients to direct a reference signal to UE 115-b.

[0130] Figure 4 An example of a process flow 400 supporting the updating of coefficients for a reconfigurable surface according to one or more aspects of this disclosure is shown. In some examples, process flow 400 may be implemented by one or more aspects of wireless communication systems 100, 200 and / or 300. For example, UE 115-c may be as referenced Figure 1 The UE 115 described, as referenced Figure 2 The UE 115-a described or as referenced Figure 3 The example of UE 115-b described herein. Additionally or alternatively, network entity 105-c may be as referenced. Figure 1 The network entity 105 described, as referenced Figure 2 The network entity described is 105-a or as referenced. Figure 3 An example of network entity 105-b as described. Additionally or alternatively, RIS210-b may be as referenced. Figure 2 The RIS210 described or as referenced Figure 3 An example of the RIS210-a described.

[0131] At 405, network entity 105-c can send an indication to RIS210-b of a first set of values ​​for configuration coefficients (e.g., auxiliary reflection coefficient vectors).

[0132] At 410, network entity 105-c may send to UE 115-c an indication of a first set of values ​​for one or more configuration coefficients (e.g., auxiliary reflection coefficient vectors). In some examples, the indication of the first set of values ​​for one or more configuration coefficients includes an indication of a first mode for each element in the set of elements used to activate or deactivate RIS 210-b. In some examples, the indication of the first set of values ​​for one or more configuration coefficients includes an indication of a first set of weight vectors. In some examples, the indication of the first set of weight vectors includes an indication of a first set of codeword indices. In some examples, the indication of the first set of weight vectors includes an indication of the corresponding phase and corresponding magnitude for each element of each weight vector in the first set of weight vectors.

[0133] At 415, network entity 105-c may send to UE 115-c an indication of one or more parameters for the communication link (e.g., a reflection link) between network entity 105-c and RIS210-b. In some such examples, the one or more parameters may include propagation delay, propagation direction, transmission power, or any combination thereof.

[0134] At 420, when the RIS210-b is configured according to a first set of one or more values ​​of configuration coefficients, network entity 105-c may send one or more reference signals (e.g., CSI-RS) to the RIS210-b. At 425, the RIS210-b may reflect one or more reference signals to UE 115-c.

[0135] At 430, UE 115-c can perform channel estimation as described herein. At 435, UE 115-c can generate a second set of values ​​(e.g., an updated reflection coefficient vector) of one or more configuration coefficients for RIS210-b. For example, UE 115-c can determine a second set of values ​​of one or more configuration coefficients for the reconfigurable surface based on a first set of values ​​of one or more configuration coefficients and one or more received reference signals.

[0136] At 440, UE 115-c can send an indication to network entity 105-c of a second set of values ​​for one or more configuration coefficients for RIS210-b.

[0137] At 445, network entity 105-c may send to RIS210-b an indication of a second set of values ​​for one or more configuration coefficients for RIS210-b. At 450, UE 115-c may send to RIS210-b a second indication of a second set of values ​​for one or more configuration coefficients for RIS210-b. In some examples, sending the indication of a second set of values ​​for one or more configuration coefficients is based on (e.g., at 415) receiving an indication of one or more parameters. In some examples, the indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second mode for each element in the set of elements used to activate or deactivate the reconfigurable surface. In some examples, the indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second set of weight vectors. In some examples, the indication of a second set of weight vectors includes an indication of a second set of codeword indices. In some examples, the indication of a second set of weight vectors includes an indication of the corresponding phase and corresponding magnitude for each element of each weight vector in the second set of weight vectors.

[0138] In some examples, the indication of a second set of values ​​for one or more configuration coefficients indicates codewords from a codebook. In some such examples, UE 115-c may send an indication to network entity 105-c and / or RIS210-b whether a codeword comes from a first type of codebook or a second type of codebook. In some examples, the second set of values ​​for one or more configuration coefficients corresponds to a weighted sum of the codeword set. In some such examples, the indication of a second set of values ​​for one or more configuration coefficients indicates the codeword set and the set of weights used to obtain the weighted sum of the codeword set. In some examples, the second set of values ​​for one or more configuration coefficients is provided via a message from UE 115-c. In some such examples, the message includes an indication of the number of sub-surfaces included in RIS210-b. Additionally or alternatively, the message also includes an indication of whether the sub-surfaces included in RIS210-b are equal or unequal in size.

[0139] In some examples, the second set of one or more values ​​of configuration coefficients for RIS210-b includes a corresponding set of one or more values ​​of configuration coefficients for each sub-surface in the set of sub-surfaces included in RIS210-b. In some such examples, the indication of the second set of one or more values ​​of configuration coefficients may indicate a corresponding one or more codewords for each sub-surface in the set of sub-surfaces included in the reconfigurable surface, a corresponding combination coefficient for one or more codewords, or both. In some examples, the indication of the second set of one or more values ​​of configuration coefficients indicates the corresponding phase and corresponding amplitude of each value in the second set of one or more values ​​of configuration coefficients for each sub-surface in the set of sub-surfaces included in the reconfigurable surface.

[0140] Figure 5 A block diagram 500 of a device 505 supporting updates for coefficients of a reconfigurable surface, according to one or more aspects of this disclosure, is shown. Device 505 may be an example of aspects of a UE 115 as described herein. Device 505 may include a receiver 510, a transmitter 515, and a communications manager 520. Device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0141] Receiver 510 may provide components for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to updating coefficients for reconfigurable surfaces). The information may be transmitted to other components of device 505. Receiver 510 may utilize a single antenna or a collection of antennas.

[0142] Transmitter 515 may provide components for transmitting signals generated by other components of device 505. For example, transmitter 515 may transmit information associated with various information channels (e.g., control channels, data channels, information channels related to updating coefficients for reconfigurable surfaces), such as packets, user data, control information, or any combination thereof. In some examples, transmitter 515 may be co-located with receiver 510 in a transceiver module. Transmitter 515 may utilize a single antenna or a collection of multiple antennas.

[0143] The communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or various components thereof, may be examples of components used to perform updates for various aspects of coefficients of a reconfigurable surface as described herein. For example, the communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0144] In some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include a processor, digital signal processor (DSP), central processing unit (CPU), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, microcontroller, discrete gate or transistor logic device, discrete hardware component, or any combination thereof, configured as or otherwise to support components for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0145] Additionally or alternatively, in some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented in code executed by a processor (e.g., implemented as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be performed by (e.g., a general-purpose processor, DSP, CPU, ASIC, FPGA, microcontroller, or any combination of these or other programmable logic devices configured as or otherwise supporting components for performing the functions described in this disclosure).

[0146] In some examples, the communication manager 520 may be configured to use or otherwise cooperate with the receiver 510, transmitter 515, or both to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 520 may receive information from the receiver 510, transmit information to the transmitter 515, or be integrated in combination with the receiver 510, transmitter 515, or both to acquire information, output information, or perform various other operations as described herein.

[0147] Additionally or alternatively, according to the examples disclosed herein, the communication manager 520 may support wireless communication at the UE. For example, the communication manager 520 may be configured as or otherwise support components for receiving from a network entity an indication of a first set of values ​​for one or more configuration coefficients for a reconfigurable surface. The communication manager 520 may be configured as or otherwise support components for receiving one or more reference signals via the reconfigurable surface from a network entity when the reconfigurable surface is configured according to the first set of values ​​for one or more configuration coefficients. The communication manager 520 may be configured as or otherwise support components for determining a second set of values ​​for one or more configuration coefficients for the reconfigurable surface based on the first set of values ​​for one or more configuration coefficients and upon receiving one or more reference signals. The communication manager 520 may be configured as or otherwise support components for transmitting to a network entity an indication of the second set of values ​​for one or more configuration coefficients for the reconfigurable surface.

[0148] By including or configuring a communication manager 520 according to an example as described herein, device 505 (e.g., a processor that controls or otherwise couples to receiver 510, transmitter 515, communication manager 520, or a combination thereof) may support techniques for device 505 to use channel estimation to determine one or more values ​​of one or more configuration coefficients for a reconfigurable surface, which may enable the reconfigurable surface to reflect signals more accurately toward device 505.

[0149] Figure 6 A block diagram 600 of a device 605 supporting updates for coefficients of a reconfigurable surface, according to one or more aspects of this disclosure, is shown. Device 605 may be an example of aspects of device 505 or UE 115 as described herein. Device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. Device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0150] Receiver 610 may provide components for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to updating coefficients for reconfigurable surfaces). The information may be transmitted to other components of device 605. Receiver 610 may utilize a single antenna or a collection of antennas.

[0151] Transmitter 615 may provide components for transmitting signals generated by other components of device 605. For example, transmitter 615 may transmit information associated with various information channels (e.g., control channels, data channels, information channels related to updating coefficients for reconfigurable surfaces), such as packets, user data, control information, or any combination thereof. In some examples, transmitter 615 may be co-located with receiver 610 in a transceiver module. Transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0152] Device 605 or its various components may be examples of parts used to perform various aspects of updating coefficients for reconfigurable surfaces as described herein. For example, communication manager 620 may include configuration coefficient receiver 625, reference signal receiver 630, configuration coefficient determiner 635, configuration coefficient transmitter 640, or any combination thereof. Communication manager 620 may be examples of aspects of communication manager 520 as described herein. In some examples, communication manager 620 or its various components may be configured to use or otherwise cooperate with receiver 610, transmitter 615, or both to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, communication manager 620 may receive information from receiver 610, transmit information to transmitter 615, or be integrated in combination with receiver 610, transmitter 615, or both to acquire information, output information, or perform various other operations as described herein.

[0153] According to the examples disclosed herein, the communication manager 620 may support wireless communication at the UE. The configuration coefficient receiver 625 may be configured as, or otherwise supported, as a component for receiving from a network entity an indication of a first set of values ​​for one or more configuration coefficients for a reconfigurable surface. The reference signal receiver 630 may be configured as, or otherwise supported, as a component for receiving one or more reference signals via the reconfigurable surface from a network entity when the reconfigurable surface is configured according to the first set of values ​​for one or more configuration coefficients. The configuration coefficient determiner 635 may be configured as, or otherwise supported, as a component for determining a second set of values ​​for one or more configuration coefficients for a reconfigurable surface based on the first set of values ​​for one or more configuration coefficients and upon receiving one or more reference signals. The configuration coefficient transmitter 640 may be configured as, or otherwise supported, as a component for transmitting to a network entity an indication of the second set of values ​​for one or more configuration coefficients for a reconfigurable surface.

[0154] Figure 7A block diagram 700 is shown of a communication manager 720 supporting updates for coefficients of a reconfigurable surface according to one or more aspects of this disclosure. The communication manager 720 may be an example of aspects of the communication manager 520, communication manager 620, or both as described herein. The communication manager 720 or its various components may be examples of parts for performing the various aspects of updating coefficients for a reconfigurable surface as described herein. For example, the communication manager 720 may include a configuration coefficient receiver 725, a reference signal receiver 730, a configuration coefficient determiner 735, a configuration coefficient transmitter 740, a communication link parameter receiver 745, a codebook indication transmitter 750, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0155] Additionally or alternatively, according to the examples disclosed herein, the communication manager 720 may support wireless communication at the UE. The configuration coefficient receiver 725 may be configured as or otherwise supported as a component for receiving from a network entity an indication of a first set of values ​​for one or more configuration coefficients for a reconfigurable surface. The reference signal receiver 730 may be configured as or otherwise supported as a component for receiving one or more reference signals via the reconfigurable surface from a network entity when the reconfigurable surface is configured according to the first set of values ​​for one or more configuration coefficients. The configuration coefficient determiner 735 may be configured as or otherwise supported as a component for determining a second set of values ​​for one or more configuration coefficients for a reconfigurable surface based on the first set of values ​​for one or more configuration coefficients and upon receiving one or more reference signals. The configuration coefficient transmitter 740 may be configured as or otherwise supported as a component for transmitting to a network entity an indication of the second set of values ​​for one or more configuration coefficients for a reconfigurable surface.

[0156] In some examples, the communication link parameter receiver 745 may be configured as or otherwise support a component for receiving indications from a network entity of one or more parameters for a communication link between the network entity and the reconfigurable surface, wherein the one or more parameters include propagation delay, propagation direction, channel gain, or any combination thereof, and wherein the transmission of an indication of a second set of values ​​for one or more configuration coefficients is based on the receipt of indications for one or more parameters.

[0157] In some examples, the indication of a first set of values ​​for one or more configuration coefficients includes an indication of a first mode for each element in the set of elements used to activate or deactivate the reconfigurable surface. In some examples, the indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second mode for each element in the set of elements used to activate or deactivate the reconfigurable surface, or an indication of a set of weight vectors.

[0158] In some examples, the indication of a first set of values ​​for one or more configuration coefficients includes an indication of a first set of weight vectors. In some examples, the indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second set of weight vectors or an indication of a mode for each element in a set of elements used to activate or deactivate the reconfigurable surface.

[0159] In some examples, the indication of the first set of weight vectors includes an indication of the first set of codeword indices, or includes an indication of the corresponding phase and magnitude of each element of each weight vector in the first set of weight vectors. In some examples, the indication of the second set of weight vectors includes an indication of the second set of codeword indices, or includes an indication of the corresponding phase and magnitude of each element of each weight vector in the second set of weight vectors.

[0160] In some examples, the indication of a second set of values ​​for one or more configuration coefficients indicates codewords from the codebook.

[0161] In some examples, the codebook indication transmitter 750 may be configured as, or otherwise supported as, a component for sending an indication to a network entity whether a codeword comes from a first type of codebook or a second type of codebook.

[0162] In some examples, the second set of one or more values ​​of the configuration coefficients corresponds to a weighted sum of a set of multiple codewords. In some examples, the indication of the second set of one or more values ​​of the configuration coefficients indicates a set of multiple codewords and a set of weights used to obtain the weighted sum of the set of multiple codewords.

[0163] In some examples, the configuration coefficient transmitter 740 may be configured as, or otherwise supported as, a component for sending an indication to network entities of the number of sub-surfaces included in a reconfigurable surface.

[0164] In some examples, the configuration coefficient transmitter 740 may be configured as, or otherwise supported as, a component for sending to network entities an indication of whether the sub-surfaces included in the reconfigurable surface are equal or unequal in size.

[0165] In some examples, the second set of one or more values ​​for the configuration coefficients of the reconfigurable surface includes a corresponding set of one or more values ​​for the configuration coefficients of each of the multiple sub-surfaces included in the reconfigurable surface.

[0166] In some examples, the indication of a second set of values ​​for one or more configuration coefficients indicates one or more codewords for each of the set of multiple sub-surfaces included in the reconfigurable surface, a corresponding combination coefficient for one or more codewords, or both.

[0167] In some examples, the indication of a second set of one or more values ​​of configuration coefficients indicates the corresponding phase and corresponding magnitude of each value in the second set of one or more values ​​of configuration coefficients for each of the multiple sub-surfaces included in the set of reconfigurable surfaces.

[0168] Figure 8 A diagram of a system 800 including a device 805 supporting the updating of coefficients for a reconfigurable surface, according to one or more aspects of this disclosure, is shown. Device 805 may be an example of device 505, device 605, or UE 115 as described herein, or a component including such devices. Device 805 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof (e.g., wirelessly). Device 805 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 820, an input / output (I / O) controller 810, a transceiver 815, an antenna 825, a memory 830, a code 835, and a processor 840. These components may communicate electronically or otherwise (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 845).

[0169] The I / O controller 810 manages the input and output signals of the device 805. The I / O controller 810 can also manage peripheral devices not integrated into the device 805. In some cases, the I / O controller 810 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 810 may utilize an operating system such as... Alternatively, it may be another known operating system. Additionally or alternatively, the I / O controller 810 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 810 may be implemented as part of a processor (such as processor 840). In some cases, a user may interact with device 805 via the I / O controller 810 or via hardware components controlled by the I / O controller 810.

[0170] In some cases, device 805 may include a single antenna 825. However, in other cases, device 805 may have more than one antenna 825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. Transceiver 815 may communicate bidirectionally via one or more antennas 825, wired or wireless links, as described herein. For example, transceiver 815 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 815 may also include a modem for: modulating packets; providing the modulated packets to one or more antennas 825 for transmission; and demodulating packets received from one or more antennas 825. Transceiver 815, or transceiver 815 and one or more antennas 825, may be an example of transmitter 515, transmitter 615, receiver 510, receiver 610, or any combination thereof or components thereof as described herein.

[0171] Memory 830 may include random access memory (RAM) and read-only memory (ROM). Memory 830 may store computer-readable, computer-executable code 835, including instructions that, when executed by processor 840, cause device 805 to perform the various functions described herein. Code 835 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 835 may not be directly executable by processor 840, but may (e.g., when compiled and executed) cause the computer to perform the functions described herein. In some cases, among other things, memory 830 may also include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0172] Processor 840 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 840 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in memory (e.g., memory 830) to cause device 805 to perform various functions (e.g., supporting functions or tasks for updating coefficients for reconfigurable surfaces). For example, device 805 or components of device 805 may include processor 840 and memory 830 coupled to or coupled to processor 840, processor 840 and memory 830 being configured to perform the various functions described herein.

[0173] Additionally or alternatively, according to the examples disclosed herein, the communication manager 820 may support wireless communication at the UE. For example, the communication manager 820 may be configured as or otherwise support components for receiving from a network entity an indication of a first set of values ​​for one or more configuration coefficients for a reconfigurable surface. The communication manager 820 may be configured as or otherwise support components for receiving one or more reference signals via the reconfigurable surface from a network entity when the reconfigurable surface is configured according to the first set of values ​​for one or more configuration coefficients. The communication manager 820 may be configured as or otherwise support components for determining a second set of values ​​for one or more configuration coefficients for the reconfigurable surface based on the first set of values ​​for one or more configuration coefficients and upon receiving one or more reference signals. The communication manager 820 may be configured as or otherwise support components for transmitting to a network entity an indication of the second set of values ​​for one or more configuration coefficients for the reconfigurable surface.

[0174] By including or configuring a communication manager 820 according to an example as described herein, device 805 may support a technique for device 805 to use channel estimation to determine one or more values ​​of one or more configuration coefficients for a reconfigurable surface, which may enable the reconfigurable surface to reflect signals more accurately toward device 805.

[0175] In some examples, the communication manager 820 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise coordinating with transceiver 815, one or more antennas 825, or any combination thereof. For example, the communication manager 820 may be configured to receive or transmit messages or other signaling as described herein via transceiver 815. Although the communication manager 820 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 820 may be supported or performed by processor 840, memory 830, code 835, or any combination thereof. For example, code 835 may include instructions that can be executed by processor 840 to cause device 805 to perform various aspects of updating coefficients for reconfigurable surfaces as described herein, or processor 840 and memory 830 may be otherwise configured to perform or support such operations.

[0176] Figure 9A block diagram 900 is shown of a device 905 supporting updates for coefficients of a reconfigurable surface according to one or more aspects of this disclosure. Device 905 may be an example of aspects of network entity 105 as described herein. Device 905 may include a receiver 910, a transmitter 915, and a communication manager 920. Device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0177] Receiver 910 may provide components for acquiring (e.g., receiving, determining, identifying) information (such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units)) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). The information may be passed to other components of device 905. In some examples, receiver 910 may support acquiring information by receiving signals via one or more antennas. Additionally or alternatively, receiver 910 may support acquiring information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0178] Transmitter 915 may provide components for outputting (e.g., transmitting, providing, conveying, transmitting) information generated by other components of device 905. For example, transmitter 915 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, transmitter 915 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, transmitter 915 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, transmitter 915 and receiver 910 may be co-located in a transceiver, which may include or be coupled to a modem.

[0179] The communication manager 920, receiver 910, transmitter 915, or various combinations thereof, or various components thereof, may be examples of components used to perform updates for various aspects of coefficients of a reconfigurable surface as described herein. For example, the communication manager 920, receiver 910, transmitter 915, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0180] In some examples, the communication manager 920, receiver 910, transmitter 915, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include processors, DSPs, CPUs, ASICs, FPGAs, or other programmable logic devices, microcontrollers, discrete gate or transistor logic devices, discrete hardware components, or any combination thereof, configured as or otherwise to support components for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0181] Additionally or alternatively, in some examples, the communication manager 920, receiver 910, transmitter 915, or various combinations or components thereof may be implemented in code executed by a processor (e.g., implemented as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 920, receiver 910, transmitter 915, or various combinations or components thereof may be performed by (e.g., a general-purpose processor, DSP, CPU, ASIC, FPGA, microcontroller, or any combination of these or other programmable logic devices configured as or otherwise supporting components for performing the functions described in this disclosure).

[0182] In some examples, the communication manager 920 may be configured to use or otherwise cooperate with the receiver 910, transmitter 915, or both to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 920 may receive information from the receiver 910, transmit information to the transmitter 915, or be integrated in combination with the receiver 910, transmitter 915, or both to acquire information, output information, or perform various other operations as described herein.

[0183] Additionally or alternatively, according to the examples disclosed herein, the communication manager 920 may support wireless communication at a network entity. For example, the communication manager 920 may be configured as or otherwise support a component for outputting an indication of a first set of values ​​for one or more configuration coefficients for a reconfigurable surface. The communication manager 920 may be configured as or otherwise support a component for outputting one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to the first set of values ​​for one or more configuration coefficients. The communication manager 920 may be configured as or otherwise support a component for obtaining an indication of a second set of values ​​for one or more configuration coefficients for the reconfigurable surface based on the output of the indication of the first set of values ​​for one or more configuration coefficients and the output of one or more reference signals.

[0184] By including or configuring a communication manager 920 according to an example as described herein, device 905 (e.g., a processor that controls or otherwise couples to receiver 910, transmitter 915, communication manager 920, or a combination thereof) may support techniques for device 905 that enable UE to use channel estimation to determine one or more values ​​of one or more configuration coefficients for a reconfigurable surface, which may enable the reconfigurable surface to reflect signals more accurately from device 905 toward UE.

[0185] Figure 10 A block diagram 1000 of a device 1005 supporting updates for coefficients of a reconfigurable surface, according to one or more aspects of this disclosure, is shown. Device 1005 may be an example of aspects of device 905 or network entity 105 as described herein. Device 1005 may include receiver 1010, transmitter 1015, and communication manager 1020. Device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0186] Receiver 1010 may provide components for acquiring (e.g., receiving, determining, identifying) information (such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units)) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). The information may be passed to other components of device 1005. In some examples, receiver 1010 may support acquiring information by receiving signals via one or more antennas. Additionally or alternatively, receiver 1010 may support acquiring information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0187] Transmitter 1015 may provide components for outputting (e.g., transmitting, providing, conveying, transmitting) information generated by other components of device 1005. For example, transmitter 1015 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, transmitter 1015 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, transmitter 1015 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, transmitter 1015 and receiver 1010 may be co-located in a transceiver, which may include or be coupled to a modem.

[0188] Device 1005 or its various components may be examples of parts for performing various aspects of updating coefficients for reconfigurable surfaces as described herein. For example, communication manager 1020 may include configuration coefficient output component 1025, reference signal output component 1030, configuration coefficient acquirer 1035, or any combination thereof. Communication manager 1020 may be examples of aspects of communication manager 920 as described herein. In some examples, communication manager 1020 or its various components may be configured to use or otherwise cooperate with receiver 1010, transmitter 1015, or both to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, communication manager 1020 may receive information from receiver 1010, transmit information to transmitter 1015, or be integrated in combination with receiver 1010, transmitter 1015, or both to acquire information, output information, or perform various other operations as described herein.

[0189] According to the examples disclosed herein, the communication manager 1020 may support wireless communication at a network entity. The configuration coefficient output component 1025 may be configured as, or otherwise supported, as a component for outputting an indication of a first set of values ​​for one or more configuration coefficients for a reconfigurable surface. The reference signal output component 1030 may be configured as, or otherwise supported, as a component for outputting one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to the first set of values ​​for one or more configuration coefficients. The configuration coefficient obtainr 1035 may be configured as, or otherwise supported, as a component for obtaining an indication of a second set of values ​​for one or more configuration coefficients for a reconfigurable surface based on the output of an indication of the first set of values ​​for one or more configuration coefficients and the output of one or more reference signals.

[0190] Figure 11A block diagram 1100 is shown of a communication manager 1120 supporting updates for coefficients of a reconfigurable surface according to one or more aspects of this disclosure. The communication manager 1120 may be an example of a communication manager 920, a communication manager 1020, or aspects thereof as described herein. The communication manager 1120 or its various components may be examples of components for performing various aspects of updating coefficients for a reconfigurable surface as described herein. For example, the communication manager 1120 may include a configuration coefficient output component 1125, a reference signal output component 1130, a configuration coefficient acquirer 1135, a communication parameter output component 1140, a codebook indication output component 1145, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses), and this communication may include communication within a protocol layer of a protocol stack, communication associated with a logical channel of the protocol stack (e.g., between protocol layers of the protocol stack, within a device, component, or virtualization component associated with network entity 105, between devices, components, or virtualization components associated with network entity 105), or any combination thereof.

[0191] Additionally or alternatively, according to the examples disclosed herein, the communication manager 1120 may support wireless communication at a network entity. The configuration coefficient output component 1125 may be configured as or otherwise supported as a component for outputting an indication of a first set of values ​​for one or more configuration coefficients for a reconfigurable surface. The reference signal output component 1130 may be configured as or otherwise supported as a component for outputting one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to the first set of values ​​for one or more configuration coefficients. The configuration coefficient obtainr 1135 may be configured as or otherwise supported as a component for obtaining an indication of a second set of values ​​for one or more configuration coefficients for a reconfigurable surface based on the output of an indication of the first set of values ​​for one or more configuration coefficients and the output of one or more reference signals.

[0192] In some examples, the communication parameter output component 1140 may be configured as or otherwise support a component for outputting indications of one or more parameters for a communication link between a network entity and a reconfigurable surface, wherein the one or more parameters include propagation delay, propagation direction, transmission power, or any combination thereof, and wherein an indication of a second set of values ​​for one or more configuration coefficients is obtained based on the output indications of one or more parameters.

[0193] In some examples, the indication of a first set of values ​​for one or more configuration coefficients includes an indication of a first mode for each element in the set of elements used to activate or deactivate the reconfigurable surface. In some examples, the indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second mode for each element in the set of elements used to activate or deactivate the reconfigurable surface, or an indication of a set of weight vectors.

[0194] In some examples, the indication of a first set of values ​​for one or more configuration coefficients includes an indication of a first set of weight vectors. In some examples, the indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second set of weight vectors or an indication of a mode for each element in a set of elements used to activate or deactivate the reconfigurable surface.

[0195] In some examples, the indication of the first set of weight vectors includes an indication of the first set of codeword indices, or includes an indication of the corresponding phase and magnitude of each element of each weight vector in the first set of weight vectors. In some examples, the indication of the second set of weight vectors includes an indication of the second set of codeword indices, or includes an indication of the corresponding phase and magnitude of each element of each weight vector in the second set of weight vectors.

[0196] In some examples, the indication of a second set of values ​​for one or more configuration coefficients indicates codewords from the codebook.

[0197] In some examples, the codebook indication output component 1145 may be configured as or otherwise supported as a component for obtaining an indication of whether a codeword comes from a first type of codebook or a second type of codebook.

[0198] In some examples, the second set of one or more values ​​of the configuration coefficients corresponds to a weighted sum of a set of multiple codewords. In some examples, the indication of the second set of one or more values ​​of the configuration coefficients indicates a set of multiple codewords and a set of weights used to obtain the weighted sum of the set of multiple codewords.

[0199] In some examples, the configuration coefficient obtainr 1135 may be configured as or otherwise supported as a component for obtaining an indication of the number of sub-surfaces included in a reconfigurable surface.

[0200] In some examples, the configuration coefficient obtainr 1135 may be configured as or otherwise supported as a component for obtaining an indication of whether the sub-surfaces included in the reconfigurable surface are equal or unequal in size.

[0201] In some examples, the second set of one or more values ​​for the configuration coefficients of the reconfigurable surface includes a corresponding set of one or more values ​​for the configuration coefficients of each of the multiple sub-surfaces included in the reconfigurable surface.

[0202] In some examples, the indication of a second set of values ​​for one or more configuration coefficients indicates one or more codewords for each of the set of multiple sub-surfaces included in the reconfigurable surface, a corresponding combination coefficient for one or more codewords, or both.

[0203] In some examples, the indication of a second set of one or more values ​​of configuration coefficients indicates the corresponding phase and corresponding magnitude of each value in the second set of one or more values ​​of configuration coefficients for each of the multiple sub-surfaces included in the set of reconfigurable surfaces.

[0204] Figure 12 A diagram of a system 1200 including a device 1205 supporting the updating of coefficients for a reconfigurable surface, according to one or more aspects of this disclosure, is shown. Device 1205 may be an example of device 905, device 1005, or network entity 105 as described herein, or may include components thereof. Device 1205 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof, and this communication may include communication via one or more wired interfaces, one or more wireless interfaces, or any combination thereof. Device 1205 may include components supporting output and acquisition of communication, such as a communication manager 1220, transceiver 1210, antenna 1215, memory 1225, code 1230, and processor 1235. These components may communicate electronically via one or more buses (e.g., bus 1240) or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically).

[0205] Transceiver 1210 may support bidirectional communication via a wired link, a wireless link, or both, as described herein. In some examples, transceiver 1210 may include a wired transceiver and be able to communicate bidirectionally with another wired transceiver. Additionally or alternatively, in some examples, transceiver 1210 may include a wireless transceiver and be able to communicate bidirectionally with another wireless transceiver. In some examples, device 1205 may include one or more antennas 1215 that are capable of (e.g., concurrently) transmitting or receiving wireless transmissions. Transceiver 1210 may also include a modem for: modulating a signal; providing the modulated signal for transmission (e.g., via one or more antennas 1215, via a wired transmitter); receiving the modulated signal (e.g., from one or more antennas 1215, from a wired receiver); and demodulating the signal. In some embodiments, transceiver 1210 may include one or more interfaces, such as one or more interfaces coupled to one or more antennas 1215 configured to support various receive or acquire operations, or one or more interfaces coupled to one or more antennas 1215 configured to support various transmit or output operations, or combinations thereof. In some embodiments, transceiver 1210 may include one or more processor or memory components or be configured to couple to said one or more processor or memory components, said one or more processor or memory components being operable to perform or support operations based on received or acquired information or signals, or generate information or other signals for transmission or other output, or any combination thereof. In some embodiments, transceiver 1210, or transceiver 1210 and one or more antennas 1215, or transceiver 1210 and one or more antennas 1215 and one or more processor or memory components (e.g., processor 1235 or memory 1225 or both) may be included in a chip or chip assembly mounted in device 1205. In some examples, the transceiver may be able to operate to support communication via one or more communication links (e.g., communication link 125, backhaul communication link 120, midhaul communication link 162, and fronthaul communication link 168).

[0206] Memory 1225 may include RAM and ROM. Memory 1225 may store computer-readable, computer-executable code 1230, including instructions that, when executed by processor 1235, cause device 1205 to perform the various functions described herein. Code 1230 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 1230 may not be directly executable by processor 1235, but may (e.g., when compiled and executed) cause the computer to perform the functions described herein. In some cases, among other things, memory 1225 may also contain a BIOS that controls basic hardware or software operation, such as interaction with peripheral components or devices.

[0207] Processor 1235 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, ASICs, CPUs, FPGAs, microcontrollers, programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any combination thereof). In some cases, processor 1235 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1235. Processor 1235 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1225) to cause device 1205 to perform various functions (e.g., supporting functions or tasks for updating coefficients for reconfigurable surfaces). For example, device 1205 or components thereof may include processor 1235 and memory 1225 coupled to processor 1235, wherein processor 1235 and memory 1225 are configured to perform the various functions described herein. Processor 1235 may be an example of a cloud computing platform (e.g., one or more physical nodes and supporting software such as an operating system, virtual machine, or container instance) that can (e.g., by executing code 1230) host functions to perform the functions of device 1205. Processor 1235 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in device 1205 (such as in memory 1225). In some implementations, processor 1235 may be a component of a processing system. A processing system can generally refer to a system or a series of machines or components that receive input and process that input to produce a set of outputs that can be passed to, for example, other systems or components of device 1205. For example, the processing system of device 1205 may refer to a system that includes various other components or subcomponents of device 1205, such as processor 1235, or transceiver 1210, or communication manager 1220, or other components or combinations of components of device 1205. The processing system of device 1205 can interface with other components of device 1205 and can process information (such as inputs or signals) received from other components or output information to other components. For example, the chip or modem of device 1205 may include a processing system and one or more interfaces for outputting information or for receiving information, or both. The one or more interfaces may be implemented as or otherwise include a first interface configured to output information and a second interface configured to receive information, or the same interface configured to both output and receive information, and other specific implementations. In some specific implementations, the one or more interfaces may refer to the interface between the processing system of the chip or modem and the transmitter, enabling device 1205 to transmit information output from the chip or modem.Additionally or alternatively, in some embodiments, the one or more interfaces may refer to the interface between the processing system of the chip or modem and the receiver, enabling device 1205 to receive information or signal input, and such information to be transmitted to the processing system. Those skilled in the art will readily recognize that the first interface may also receive information or signal input, and the second interface may also output information or signal output.

[0208] In some examples, bus 1240 may support communication at the protocol layer of the protocol stack (e.g., within a protocol layer). In some examples, bus 1240 may support communication associated with logical channels of the protocol stack (e.g., between protocol layers of the protocol stack), which may include communication performed within components of device 1205, or communication performed between different components of device 1205 that may be co-located or located in different locations (e.g., where device 1205 may refer to a system in which one or more of communication manager 1220, transceiver 1210, memory 1225, code 1230, and processor 1235 may be located in one of the different components or partitioned between the different components).

[0209] In some examples, the communication manager 1220 may manage (e.g., via one or more wired or wireless backhaul links) various aspects of communication with the core network 130. For example, the communication manager 1220 may manage the transfer of data communication for client devices (such as one or more UEs 115). In some examples, the communication manager 1220 may manage communication with other network entities 105 and may include a controller or scheduler for coordinating with other network entities 105 to control communication with UE 115. In some examples, the communication manager 1220 may support an X2 interface within LTE / LTE-A wireless communication network technology to provide communication between network entities 105.

[0210] Additionally or alternatively, according to the examples disclosed herein, the communication manager 1220 may support wireless communication at a network entity. For example, the communication manager 1220 may be configured as or otherwise support components for outputting an indication of a first set of values ​​for one or more configuration coefficients for a reconfigurable surface. The communication manager 1220 may be configured as or otherwise support components for outputting one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to the first set of values ​​for one or more configuration coefficients. The communication manager 1220 may be configured as or otherwise support components for obtaining an indication of a second set of values ​​for one or more configuration coefficients for the reconfigurable surface based on the output of the first set of values ​​for one or more configuration coefficients and the output of one or more reference signals.

[0211] By including or configuring a communication manager 1220 according to an example as described herein, device 1205 may support a technique for device 1205 that enables UE to use channel estimation to determine one or more values ​​of one or more configuration coefficients for a reconfigurable surface, which may enable the reconfigurable surface to reflect signals more accurately from device 1205 toward UE.

[0212] In some examples, the communication manager 1220 may be configured to use or otherwise coordinate with transceiver 1210, one or more antennas 1215 (e.g., where applicable), or any combination thereof to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 1220 may be configured to receive or transmit messages or other signaling as described herein via transceiver 1210. Although the communication manager 1220 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1220 may be supported or performed by transceiver 1210, processor 1235, memory 1225, code 1230, or any combination thereof. For example, code 1230 may include instructions that can be executed by processor 1235 to cause device 1205 to perform various aspects of updating coefficients for reconfigurable surfaces as described herein, or processor 1235 and memory 1225 may be otherwise configured to perform or support such operations.

[0213] Figure 13 A flowchart illustrating a method 1300 for updating coefficients for a reconfigurable surface according to one or more aspects of this disclosure is shown. Operation of method 1300 can be implemented by a UE or its components as described herein. For example, operation of method 1300 can be implemented by, as referenced... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0214] At 1305, the method may include receiving from a network entity an indication of a first set of one or more values ​​for configuration coefficients for a reconfigurable surface. Operation of 1305 may be performed according to examples as disclosed herein. In some examples, aspects of operation of 1305 may be provided by reference to [reference needed]. Figure 7 The described configuration is performed by receiver 725. Additionally or alternatively, components for performing 1305 may, but not necessarily include, for example, I / O controller 810, transceiver 815, communication manager 820, antenna 825, memory 830, code 835, processor 840, or any combination thereof.

[0215] At 1310, the method may include receiving one or more reference signals from a network entity via the reconfigurable surface when the reconfigurable surface is configured according to a first set of one or more values ​​of configuration coefficients. The operation of 1310 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1310 may be determined by references as described in the references. Figure 7 The reference signal receiver 730 described herein is used to perform this action. Additionally or alternatively, the components used to perform 1310 may, but do not necessarily include, for example, an I / O controller 810, a transceiver 815, a communication manager 820, an antenna 825, a memory 830, a code 835, a processor 840, or any combination thereof.

[0216] At 1315, the method may include a first set of one or more values ​​of configuration coefficients and a second set of one or more values ​​of configuration coefficients for a reconfigurable surface, determined by receiving one or more reference signals. The operation of 1315 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1315 may be determined by reference to... Figure 7 The configuration coefficient determiner 735 described herein is used to perform this action. Additionally or alternatively, the components used to perform 1315 may, but do not necessarily include, for example, an I / O controller 810, a transceiver 815, a communication manager 820, an antenna 825, a memory 830, code 835, a processor 840, or any combination thereof.

[0217] At 1320, the method may include sending an indication to the network entity of a second set of one or more values ​​for configuration coefficients for the reconfigurable surface. The operation of 1320 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1320 may be provided by reference to [reference needed]. Figure 7 The described configuration coefficient transmitter 740 is used to perform this action. Additionally or alternatively, the components used to perform 1320 may, but do not necessarily include, for example, an I / O controller 810, a transceiver 815, a communication manager 820, an antenna 825, a memory 830, a code 835, a processor 840, or any combination thereof.

[0218] Figure 14 A flowchart illustrating a method 1400 for updating coefficients for a reconfigurable surface according to one or more aspects of this disclosure is shown. Operation of method 1400 may be implemented by a network entity or its components as described herein. For example, operation of method 1400 may be implemented by, as referenced... Figures 1 to 4 as well as Figures 9 to 12 The described network entity performs the functions described. In some examples, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the described functions. Additionally or alternatively, the network entity may use dedicated hardware to perform aspects of the described functions.

[0219] At 1405, the method may include outputting an indication of a first set of values ​​for one or more configuration coefficients for the reconfigurable surface. The operation of 1405 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1405 may be determined by reference to [reference needed]. Figure 11 The described configuration coefficient output component 1125 is used to perform this action. Additionally or alternatively, the components used to perform 1405 may, but do not necessarily include, for example, a transceiver 1210, an antenna 1215, a communication manager 1220, a memory 1225, code 1230, a processor 1235, or any combination thereof.

[0220] At 1410, the method may include outputting one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to a first set of one or more values ​​of configuration coefficients. The operation of 1410 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 1410 may be determined by references... Figure 11 The reference signal output component 1130 described herein is used to perform this action. Additionally or alternatively, components used to perform 1410 may, but not necessarily include, for example, a transceiver 1210, an antenna 1215, a communication manager 1220, a memory 1225, a code 1230, a processor 1235, or any combination thereof.

[0221] At 1415, the method may include an indication of a first set of values ​​for one or more configuration coefficients based on outputting an indication of one or more values ​​for the configuration coefficients used for the reconfigurable surface, and an indication of a second set of values ​​for one or more configuration coefficients based on outputting one or more reference signals. The operation of 1415 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1415 may be determined by reference to... Figure 11 The configuration coefficient obtainr 1135 described herein performs this action. Additionally or alternatively, the components used to perform 1415 may, but not necessarily include, for example, a transceiver 1210, an antenna 1215, a communication manager 1220, a memory 1225, code 1230, a processor 1235, or any combination thereof.

[0222] The following provides an overview of the various aspects of this disclosure:

[0223] Aspect 1: A method for wireless communication at a UE, the method comprising: receiving from a network entity an indication of a first set of one or more values ​​of configuration coefficients for a reconfigurable surface; receiving one or more reference signals from the network entity via the reconfigurable surface when the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients; determining, at least in part, a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based on the first set of one or more values ​​of the configuration coefficients and the received one or more reference signals; and sending to the network entity an indication of the second set of one or more values ​​of the configuration coefficients for the reconfigurable surface.

[0224] Aspect 2: According to the method of aspect 1, the method further includes: receiving from the network entity an indication of one or more parameters for a communication link between the network entity and the reconfigurable surface, wherein the one or more parameters include propagation delay, propagation direction, transmission power, or any combination thereof, and wherein the indication of the second set of values ​​of the configuration coefficients is at least partially based on the receipt of the indication of the one or more parameters.

[0225] Aspect 3: The method according to any one of Aspects 1 to 2, wherein the indication of the first set of one or more values ​​of the configuration coefficients includes an indication of a first mode for activating or deactivating each element in the set of elements of the reconfigurable surface, and the indication of the second set of one or more values ​​of the configuration coefficients includes an indication of a second mode for activating or deactivating each element in the set of elements of the reconfigurable surface.

[0226] Aspect 4: The method according to any one of Aspects 1 to 3, wherein the indication of the first set of one or more values ​​of configuration coefficients includes an indication of the first set of weight vectors, and the indication of the second set of one or more values ​​of configuration coefficients includes an indication of the second set of weight vectors.

[0227] Aspect 5: According to the method of aspect 4, wherein the indication of the first set of weight vectors includes an indication of the first set of codeword indices, and the indication of the second set of weight vectors includes an indication of the second set of codeword indices.

[0228] Aspect 6: The method according to any one of Aspects 4 to 5, wherein the indication of the first set of weight vectors includes an indication of the corresponding phase and the corresponding magnitude of each element of each weight vector in the first set of weight vectors, and the indication of the second set of weight vectors includes an indication of the corresponding phase and the corresponding magnitude of each element of each weight vector in the second set of weight vectors.

[0229] Aspect 7: The method according to any one of aspects 1 to 6, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates a codeword from the codebook.

[0230] Aspect 8: According to the method of aspect 7, the method further includes: sending an indication to the network entity whether the codeword comes from a first type of codebook or a second type of codebook.

[0231] Aspect 9: The method according to any one of Aspects 1 to 8, wherein the second set of one or more values ​​of the configuration coefficients corresponds to a weighted sum of a plurality of codewords, and the indication of the second set of one or more values ​​of the configuration coefficients indicates the plurality of codewords and a set of weights for obtaining the weighted sum of the plurality of codewords.

[0232] Aspect 10: The method according to any one of Aspects 1 to 9, wherein the second set of one or more values ​​of the configuration coefficients is provided via a message from the UE, and the message includes an indication of the number of sub-surfaces included in the reconfigurable surface.

[0233] Aspect 11: According to the method of aspect 10, the message further includes an indication of whether the sub-surfaces included in the reconfigurable surface are equal or unequal in size.

[0234] Aspect 12: The method according to any one of aspects 1 to 11, wherein the second set of one or more values ​​of the configuration coefficients for the reconfigurable surface includes a corresponding set of one or more values ​​of the configuration coefficients for each of the plurality of sub-surfaces included in the reconfigurable surface.

[0235] Aspect 13: According to the method of aspect 12, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates one or more codebooks for each of the plurality of sub-surfaces included in the reconfigurable surface, a corresponding combination coefficient for the one or more codebooks, or both.

[0236] Aspect 14: The method according to any one of aspects 12 to 13, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates a corresponding phase and a corresponding amplitude for each value in the second set of one or more values ​​of the configuration coefficients for each of the plurality of sub-surfaces included in the reconfigurable surface.

[0237] Aspect 15: A method for wireless communication at a network entity, the method comprising: outputting an indication of a first set of one or more values ​​of configuration coefficients for a reconfigurable surface; outputting one or more reference signals via the reconfigurable surface when the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients; and obtaining an indication of a second set of one or more values ​​of the configuration coefficients for the reconfigurable surface based at least in part on transmitting the first set of the indication of one or more values ​​of the configuration coefficients and transmitting the one or more reference signals.

[0238] Aspect 16: The method according to aspect 15, the method further comprising: outputting an indication of one or more parameters for a communication link between the network entity and the reconfigurable surface, wherein the one or more parameters include propagation delay, propagation direction, transmission power, or any combination thereof, and wherein the indication of receiving the second set of values ​​for one or more configuration coefficients is at least partially based on transmitting the indication of the one or more parameters.

[0239] Aspect 17: The method according to any one of Aspects 15 to 16, wherein the indication of the first set of one or more values ​​of the configuration coefficients includes an indication of a first mode for activating or deactivating each element in the set of elements of the reconfigurable surface, and the indication of the second set of one or more values ​​of the configuration coefficients includes an indication of a second mode for activating or deactivating each element in the set of elements of the reconfigurable surface.

[0240] Aspect 18: The method according to any one of aspects 15 to 17, wherein the indication of the first set of one or more values ​​of configuration coefficients includes an indication of the first set of weight vectors, and the indication of the second set of one or more values ​​of configuration coefficients includes an indication of the second set of weight vectors.

[0241] Aspect 19: The method according to aspect 18, wherein the indication of the first set of weight vectors includes an indication of the first set of codeword indices, and the indication of the second set of weight vectors includes an indication of the second set of codeword indices.

[0242] Aspect 20: The method according to any one of Aspects 18 to 19, wherein the indication of the first set of weight vectors includes an indication of the corresponding phase and the corresponding magnitude of each element of each weight vector in the first set of weight vectors, and the indication of the second set of weight vectors includes an indication of the corresponding phase and the corresponding magnitude of each element of each weight vector in the second set of weight vectors.

[0243] Aspect 21: The method according to any one of aspects 15 to 20, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates a codeword from the codebook.

[0244] Aspect 22: According to the method of aspect 21, the method further includes: outputting an indication of whether the codeword comes from a codebook of a first type or a codebook of a second type.

[0245] Aspect 23: The method according to any one of aspects 15 to 22, wherein the second set of one or more values ​​of the configuration coefficients corresponds to a weighted sum of a plurality of codewords, and the indication of the second set of one or more values ​​of the configuration coefficients indicates the plurality of codewords and a set of weights for obtaining the weighted sum of the plurality of codewords.

[0246] Aspect 24: The method according to any one of aspects 15 to 23, wherein the second set of one or more values ​​of the configuration coefficients is provided via a message, and the message includes an indication of the number of sub-surfaces included in the reconfigurable surface.

[0247] Aspect 25: According to the method of aspect 24, the message further includes an indication of whether the sub-surfaces included in the reconfigurable surface are equal or unequal in size.

[0248] Aspect 26: The method according to any one of aspects 15 to 25, wherein the second set of one or more values ​​of the configuration coefficients for the reconfigurable surface includes a corresponding set of one or more values ​​of the configuration coefficients for each of the plurality of sub-surfaces included in the reconfigurable surface.

[0249] Aspect 27: According to the method of aspect 26, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates one or more codebooks for each of the plurality of sub-surfaces included in the reconfigurable surface, a corresponding combination coefficient for the one or more codebooks, or both.

[0250] Aspect 28: The method according to any one of aspects 26 to 27, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates a corresponding phase and a corresponding amplitude for each value in the second set of one or more values ​​of the configuration coefficients for each of the plurality of sub-surfaces included in the reconfigurable surface.

[0251] Aspect 29: An apparatus comprising: a memory; a transceiver; and at least one processor coupled to the memory and the transceiver, the at least one processor being configured to perform a method according to any one of aspects 1 to 14.

[0252] Aspect 30: An apparatus for wireless communication at a UE, the apparatus comprising at least one component for performing the method according to any one of aspects 1 to 14.

[0253] Aspect 31: A non-transitory computer-readable medium storing code for wireless communication at a UE, the code including instructions executable by a processor to perform the method according to any one of aspects 1 to 14.

[0254] Aspect 32: An apparatus comprising: a memory; and at least one processor coupled to the memory, the at least one processor being configured to perform a method according to any one of aspects 15 to 28.

[0255] Aspect 33: An apparatus for wireless communication at a network entity, the apparatus comprising at least one component for performing the method according to any one of aspects 15 to 28.

[0256] Aspect 34: A non-transitory computer-readable medium storing code for wireless communication at a network entity, said code including instructions executable by a processor to perform the method according to any one of aspects 15 to 28.

[0257] It should be noted that the methods described herein describe possible specific implementations, and the operations and steps can be rearranged or otherwise modified, and other specific implementations are also possible. Furthermore, aspects from two or more of these methods can be combined.

[0258] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein are also applicable to networks outside of LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described are applicable to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0259] The information and signals described herein can be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any combination thereof.

[0260] The various exemplary blocks and components described herein can be implemented or performed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternative embodiments, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration).

[0261] The functions described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, these functions can be stored as one or more instructions or code on a computer-readable medium, or transmitted using one or more instructions or code on a computer-readable medium. Other examples and specific implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features implementing the functions can also be physically located in different locations, including various portions distributed such that the functions are implemented in different physical locations.

[0262] Computer-readable media includes both non-transitory computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transitory storage media can be any available medium accessible by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compressed optical disc (CD) ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code components in the form of instructions or data structures, and accessible by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Additionally, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer-readable media. As used herein, disks and optical discs include CDs, laser discs, optical discs, digital multifunction discs (DVDs), floppy disks, and Blu-ray discs. Disks can reproduce data magnetically, while optical discs can reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0263] As used herein, including in the claims, the word "or" used in a list of items (e.g., a list of items accompanied by phrases such as "at least one of" or "one or more of") indicates an inclusive list, such that a list of at least one of, for example, A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Furthermore, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0264] The term "determine" encompasses a variety of actions, and therefore, "determine" can include calculation, computation, processing, derivation, investigation, lookup (such as by searching in a table, database, or other data structure), identification, and similar actions. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data stored in memory), etc. Additionally, "determine" can include parsing, acquiring, selecting, choosing, creating, and other similar actions.

[0265] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by adding a dash after the reference numeral and a second numeral for differentiation between similar components. If only the first reference numeral is used in the specification, the description can be applied to any of the similar components having the same first reference numeral, regardless of the second or other subsequent reference numerals.

[0266] The description herein, illustrated with reference to the accompanying drawings, describes an example configuration and does not represent all achievable examples or those within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," rather than "preferred" or "advantageous over other examples." The detailed description includes specific details used to provide an understanding of the described techniques. However, these techniques can be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concept of the described examples.

[0267] The description provided herein is intended to enable those skilled in the art to implement or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for wireless communication, the apparatus comprising: Memory; transceiver; and At least one processor of user equipment (UE), said at least one processor being coupled to the memory and the transceiver and configured to cause the device to: Receive from the network entity via the transceiver a first set of indications for one or more values ​​of configuration coefficients for the reconfigurable surface; When the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients, one or more reference signals are received from the network entity via the transceiver through the reconfigurable surface; The first set of values, at least in part, of the configuration coefficients, and the second set of values, of the configuration coefficients for the reconfigurable surface, are determined by receiving the one or more reference signals. as well as The transceiver sends an indication to the network entity of a second set of values ​​for one or more of the configuration coefficients for the reconfigurable surface.

2. The apparatus of claim 1, wherein the at least one processor is further configured to cause the apparatus to: The transceiver receives from the network entity an indication of one or more parameters for a communication link between the network entity and the reconfigurable surface, wherein the one or more parameters include propagation delay, propagation direction, channel gain, or any combination thereof, and wherein the at least one processor is configured to transmit the indication of a second set of values ​​for one or more configuration coefficients based at least in part on the received indication of the one or more parameters.

3. The apparatus according to claim 1, wherein: The indication of the first set of one or more values ​​of the configuration coefficient includes an indication of a first mode for activating or deactivating each element in the set of elements for the reconfigurable surface, and The indication of the second set of one or more values ​​of the configuration coefficients includes an indication of a second mode for activating or deactivating each element in the set of elements of the reconfigurable surface, or an indication of the set of weight vectors.

4. The apparatus according to claim 1, wherein: The indication of the first set of values ​​for one or more configuration coefficients includes an indication of the first set of weight vectors, and The indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second set of weight vectors or an indication of a mode for activating or deactivating each element in the set of elements for the reconfigurable surface.

5. The apparatus according to claim 4, wherein: The indication of the first set of weight vectors includes an indication of the first set of codeword indices, or includes an indication of the corresponding phase and corresponding amplitude of each element of each weight vector in the first set of weight vectors, and The indication of the second set of weight vectors includes an indication of the second set of codeword indices, or an indication of the corresponding phase and corresponding amplitude of each element of each weight vector in the second set of weight vectors.

6. The apparatus of claim 1, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates a codeword from the codebook.

7. The apparatus of claim 6, wherein the at least one processor is further configured to cause the apparatus to: The transceiver sends an indication to the network entity as to whether the codeword comes from a first type of codebook or a second type of codebook.

8. The apparatus according to claim 1, wherein: The second set of one or more values ​​of the configuration coefficients corresponds to a weighted sum of multiple codewords, and The indication of the second set of one or more values ​​of the configuration coefficients indicates the plurality of codewords and the weight set for obtaining the weighted sum of the plurality of codewords.

9. The apparatus of claim 1, wherein the at least one processor is further configured to cause the apparatus to: The transceiver sends an indication to the network entity of the number of sub-surfaces included in the reconfigurable surface.

10. The apparatus of claim 9, wherein the at least one processor is further configured to cause the apparatus to: The transceiver sends an indication to the network entity via the transceiver whether the sub-surfaces included in the reconfigurable surface are equal or unequal in size.

11. The apparatus of claim 1, wherein the second set of one or more values ​​of the configuration coefficients for the reconfigurable surface includes a corresponding set of one or more values ​​of the configuration coefficients for each of the plurality of sub-surfaces included in the reconfigurable surface.

12. The apparatus of claim 11, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates one or more codewords for each of the plurality of sub-surfaces included in the reconfigurable surface, a corresponding combination coefficient for the one or more codewords, or both.

13. The apparatus of claim 11, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates a corresponding phase and a corresponding amplitude for each value in the second set of one or more values ​​of the configuration coefficients for each of the plurality of sub-surfaces included in the reconfigurable surface.

14. An apparatus for wireless communication, the apparatus comprising: Memory; and At least one processor of the network entity, said at least one processor being coupled to the memory and configured to cause the device to: Outputs an indication of a first set of values ​​for one or more configuration coefficients used for the reconfigurable surface; When the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients, one or more reference signals are output via the reconfigurable surface; as well as An indication of a second set of values ​​for one or more configuration coefficients for the reconfigurable surface is obtained, at least in part, based on the indication of a first set of values ​​for one or more configuration coefficients and the output of the one or more reference signals.

15. The apparatus of claim 14, wherein the at least one processor is further configured to cause the apparatus to: The output indicates one or more parameters for the communication link between the network entity and the reconfigurable surface, wherein the one or more parameters include propagation delay, propagation direction, channel gain, or any combination thereof, and wherein the indication of the second set of values ​​for one or more configuration coefficients is at least partially based on the output indication of the one or more parameters.

16. The apparatus according to claim 14, wherein: The indication of the first set of one or more values ​​of the configuration coefficient includes an indication of a first mode for activating or deactivating each element in the set of elements for the reconfigurable surface, and The indication of the second set of one or more values ​​of the configuration coefficients includes an indication of a second mode for activating or deactivating each element in the set of elements of the reconfigurable surface, or an indication of the set of weight vectors.

17. The apparatus according to claim 14, wherein: The indication of the first set of values ​​for one or more configuration coefficients includes an indication of the first set of weight vectors, and The indication of a second set of values ​​for one or more configuration coefficients includes an indication of a second set of weight vectors or an indication of a mode for activating or deactivating each element in the set of elements for the reconfigurable surface.

18. The apparatus according to claim 17, wherein: The indication of the first set of weight vectors includes an indication of the first set of codeword indices, or includes an indication of the corresponding phase and corresponding amplitude of each element of each weight vector in the first set of weight vectors, and The indication of the second set of weight vectors includes an indication of the second set of codeword indices, or an indication of the corresponding phase and corresponding amplitude of each element of each weight vector in the second set of weight vectors.

19. The apparatus of claim 14, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates a codeword from the codebook.

20. The apparatus of claim 19, wherein the at least one processor is further configured to cause the apparatus to: Obtain an indication of whether the codeword comes from a first type of codebook or a second type of codebook.

21. The apparatus according to claim 14, wherein: The second set of one or more values ​​of the configuration coefficients corresponds to a weighted sum of multiple codewords, and The indication of the second set of one or more values ​​of the configuration coefficients indicates the plurality of codewords and the weight set for obtaining the weighted sum of the plurality of codewords.

22. The apparatus of claim 14, wherein the at least one processor is further configured to cause the apparatus to: Obtain an indication of the number of sub-surfaces included in the reconfigurable surface.

23. The apparatus of claim 22, wherein the at least one processor is further configured to cause the apparatus to: The output indicates whether the sub-surfaces included in the reconfigurable surface are equal or unequal in size.

24. The apparatus of claim 14, wherein the second set of one or more values ​​of the configuration coefficients for the reconfigurable surface includes a corresponding set of one or more values ​​of the configuration coefficients for each of the plurality of sub-surfaces included in the reconfigurable surface.

25. The apparatus of claim 24, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates one or more codewords for each of the plurality of sub-surfaces included in the reconfigurable surface, a corresponding combination coefficient for the one or more codewords, or both.

26. The apparatus of claim 24, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates a corresponding phase and a corresponding amplitude for each value in the second set of one or more values ​​of the configuration coefficients for each of the plurality of sub-surfaces included in the reconfigurable surface.

27. A method for conducting wireless communication at a user equipment (UE), the method comprising: Receive an indication from the network entity of a first set of values ​​for one or more configuration coefficients for the reconfigurable surface; When the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients, one or more reference signals are received from the network entity via the reconfigurable surface; The first set of values, at least in part, of the configuration coefficients, and the second set of values, of the configuration coefficients for the reconfigurable surface, are determined by receiving the one or more reference signals. as well as Send an indication to the network entity of a second set of values ​​for one or more of the configuration coefficients used for the reconfigurable surface.

28. The method of claim 27, further comprising: The network entity receives indications of one or more parameters for a communication link between the network entity and the reconfigurable surface, wherein the one or more parameters include propagation delay, propagation direction, channel gain, or any combination thereof, and wherein the indications of the second set of values ​​for one or more configuration coefficients are sent at least in part based on the received indications of the one or more parameters.

29. The method of claim 27, wherein the indication of the second set of one or more values ​​of the configuration coefficients indicates a codeword from the codebook.

30. A method for conducting wireless communication at a network entity, the method comprising: Outputs an indication of a first set of values ​​for one or more configuration coefficients used for the reconfigurable surface; When the reconfigurable surface is configured according to the first set of one or more values ​​of the configuration coefficients, one or more reference signals are output via the reconfigurable surface; as well as An indication of a second set of values ​​for one or more configuration coefficients for the reconfigurable surface is obtained, at least in part, based on the indication of a first set of values ​​for one or more configuration coefficients and the output of the one or more reference signals.

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