SRS power control method for channel estimation in reconfigurable smart surface links

Abstract

Methods, systems, and devices for wireless communications are described. A base station may determine a sounding reference signal transmit power of a user equipment (UE) and may communicate with the UE based on the determined sounding reference signal transmit power. In some examples, the base station may transmit signaling to the UE indicating a switch from a first power control mode to a second power control mode. The UE may transmit a power headroom report to the base station and in the second power control mode, and the base station may use the power headroom report to estimate the sounding reference signal transmit power. In other examples, the base station may transmit a request for one or more reports indicating the sounding reference signal transmit power based on the base station operating in a closed-loop power control mode. The UE may transmit the one or more reports to the base station.

Description

Technical Field

[0001] The following relates to wireless communications, including a sounding reference signal (SRS) power control method for channel estimation for a reconfigurable smart surface link.

[0002] background

[0003] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, and the like. 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, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems, which may be referred to as NR systems. These systems may employ various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication with multiple communication devices, which may be referred to as user equipment (UE) in addition.

[0004] In some examples, a user equipment (UE) may communicate with a base station. In some examples, the base station may perform channel estimation to estimate how a channel between the UE and the base station affects signaling conveyed in the channel. As the number of UEs communicating with the base station increases, the base station may have more overhead in estimating the channel conditions at each UE. At least in some cases, the increased overhead may be undesirable.

[0005] Overview

[0006] The described technology relates to improved methods, systems, devices and apparatuses for SRS power control methods that support channel estimation for reconfigurable smart surface links. In general, the described technology provides a base station to determine a sounding reference signal transmit power at a user equipment (UE) so that when the UE and the base station communicate with each other via a configurable reflective surface, the base station can perform channel estimation. For example, the base station can determine the sounding reference signal transmit power of the UE and can communicate with the UE based on the determined sounding reference signal transmit power. In some examples, the base station can transmit a signaling to the UE indicating a switch from a first power control mode to a second power control mode. The UE can transmit a power headroom report to the base station and in the second power control mode, and the base station can use the power headroom report to estimate the sounding reference signal transmit power. In other examples, the base station can transmit a request for one or more reports indicating the sounding reference signal transmit power. The UE can transmit one or more reports indicating the sounding reference signal transmit power to the base station.

[0007] A method for wireless communication at a UE is described. The method may include: receiving signaling from a base station indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; transmitting a report indicating a power headroom associated with sounding reference signal transmission to the base station and in the second power control mode based on receiving the signaling indicating the switch; and communicating with the base station on a wireless channel based on transmitting the report indicating the power headroom.

[0008] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: receive signaling from a base station indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; transmit a report indicating a power headroom associated with sounding reference signal transmission to the base station and in the second power control mode based on receiving the signaling indicating the switch; and communicate with the base station on a wireless channel based on transmitting the report indicating the power headroom.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include: means for receiving signaling from a base station indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; means for transmitting a report indicating a power headroom associated with sounding reference signal transmission to the base station and in the second power control mode based on receiving the signaling indicating the switch; and means for communicating with the base station on a wireless channel based on transmitting the report indicating the power headroom.

[0010] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: receive signaling from a base station indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; transmit a report indicating a power headroom associated with sounding reference signal transmission to the base station and in the second power control mode based on receiving the signaling indicating the switch; and communicate with the base station on a wireless channel based on transmitting the report indicating the power headroom.

[0011] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the first power control mode includes one of an open-loop power control mode or a closed-loop power control mode, and the second power control mode includes the other of the open-loop power control mode and the closed-loop power control mode.

[0012] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: transmitting a sounding reference signal associated with a report indicating power headroom to a base station and in a second power control mode, wherein communication with the base station can be based on transmitting the sounding reference signal.

[0013] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting a report to a base station may include operations, features, means, or instructions for transmitting a report to a base station via a configurable reflective surface.

[0014] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving signaling indicating a switch may include operations, features, means, or instructions for receiving signaling indicating a switch from a base station via a configurable reflective surface.

[0015] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the signaling includes downlink control information indicating a switch, a media access control (MAC) control element indicating a switch, or radio resource control signaling indicating a switch.

[0016] A method for wireless communication at a base station is described. The method may include: transmitting signaling to a UE indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; receiving a report indicating a power headroom associated with sounding reference signal transmission from the UE and in the second power control mode based on transmitting the signaling indicating the switch; estimating a sounding reference signal transmit power based on receiving the report indicating the power headroom; and communicating with the UE on a wireless channel based on the estimated sounding reference signal transmit power.

[0017] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: transmit signaling to a UE indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; receive a report indicating a power headroom associated with sounding reference signal transmission from the UE and in the second power control mode based on transmitting the signaling indicating the switch; estimate a sounding reference signal transmit power based on receiving the report indicating the power headroom; and communicate with the UE on a wireless channel based on the estimated sounding reference signal transmit power.

[0018] Another apparatus for wireless communication at a base station is described. The apparatus may include: means for transmitting signaling to a UE indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; means for receiving a report indicating a power headroom associated with sounding reference signal transmission from the UE and in the second power control mode based on transmitting the signaling indicating the switch; means for estimating a sounding reference signal transmit power based on receiving the report indicating the power headroom; and means for communicating with the UE on a wireless channel based on the estimated sounding reference signal transmit power.

[0019] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to perform the following operations: transmit signaling to a UE indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; receive a report indicating a power headroom associated with sounding reference signal transmission from the UE and in the second power control mode based on transmitting the signaling indicating the switch; estimate a sounding reference signal transmit power based on receiving the report indicating the power headroom; and communicate with the UE on a wireless channel based on the estimated sounding reference signal transmit power.

[0020] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the first power control mode includes one of an open-loop power control mode or a closed-loop power control mode, and the second power control mode includes the other of the open-loop power control mode and the closed-loop power control mode.

[0021] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: determining a value of a first channel state parameter associated with a UE based on an estimated sounding reference signal transmit power associated with a report indicating power headroom and a value of a second channel state parameter associated with a second UE, wherein communicating with the UE on a wireless channel may be based on determining the value of the first channel state parameter.

[0022] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving a report indicating power headroom from a UE may include operations, features, devices, or instructions for receiving the report from the UE via a configurable reflecting surface, and these methods, devices, and non-transitory computer-readable media may further include operations, features, devices, or instructions for the following actions: determining a value of a scaling factor associated with a channel condition between the UE and the configurable reflecting surface based on an estimated sounding reference signal transmit power associated with the report indicating power headroom, wherein determining the value of a first channel condition parameter includes combining the value of the scaling factor with the value of a second channel condition parameter.

[0023] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: receiving a sounding reference signal associated with a report indicating power headroom from a UE and in a second power control mode, wherein determining a value of the scaling factor can be based on receiving the sounding reference signal.

[0024] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the first channel condition parameter and the second channel condition parameter may each be associated with the same channel condition between the configurable reflective surface and the base station.

[0025] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving a report indicating power headroom from a UE may include operations, features, means, or instructions for receiving a report indicating power headroom from a UE via a configurable reflective surface.

[0026] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting signaling indicating switching to a UE may include operations, features, devices, or instructions for transmitting signaling indicating switching to the UE via reflection or refraction of a configurable reflective surface.

[0027] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the signaling includes downlink control information indicating a switch, a media access control (MAC) control element indicating a switch, or radio resource control signaling indicating a switch.

[0028] A method for wireless communication at a UE is described. The method may include: receiving a request for one or more reports from a base station indicating a transmit power at which the UE transmits a sounding reference signal; transmitting the one or more reports to the base station based on receiving the request for the one or more reports; transmitting the sounding reference signal to the base station; and communicating with the base station on a wireless channel based on the one or more reports and the sounding reference signal.

[0029] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: receive a request for one or more reports from a base station indicating a transmit power at which the UE transmits a sounding reference signal; transmit the one or more reports to the base station based on receiving the request for the one or more reports; transmit the sounding reference signal to the base station; and communicate with the base station on a wireless channel based on the one or more reports and the sounding reference signal.

[0030] Another apparatus for wireless communication at a UE is described. The apparatus may include: means for receiving a request for one or more reports from a base station indicating a transmit power at which the UE transmits a sounding reference signal; means for transmitting the one or more reports to the base station based on receiving the request for the one or more reports; means for transmitting the sounding reference signal to the base station; and means for communicating with the base station on a wireless channel based on the one or more reports and the sounding reference signal.

[0031] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: receive a request for one or more reports from a base station indicating a transmit power at which the UE transmits a sounding reference signal; transmit the one or more reports to the base station based on receiving the request for the one or more reports; transmit the sounding reference signal to the base station; and communicate with the base station on a wireless channel based on the one or more reports and the sounding reference signal.

[0032] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting a sounding reference signal to a base station may include operations, features, means, or instructions for transmitting a sounding reference signal to a base station via a configurable reflective surface.

[0033] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving a request from a base station may include operations, features, means, or instructions for receiving a request from a base station via a configurable reflective surface.

[0034] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting one or more reports to a base station may include operations, features, means, or instructions for transmitting one or more reports to a base station via a configurable reflective surface.

[0035] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: downlink control information includes a request, a media access control (MAC) control element includes a request, or radio resource control signaling includes a request.

[0036] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting one or more reports to a base station may include operations, features, devices, or instructions for transmitting uplink control information including the one or more reports to the base station.

[0037] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, uplink control information may be transmitted periodically via uplink control channel transmissions, transmitted via uplink shared channel transmissions, or both.

[0038] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the one or more reports include a report set, wherein one or more bits from each report in the report set cumulatively indicate the transmit power.

[0039] In some examples of the methods, devices, and non-transitory computer-readable media described herein, a report set includes a first report and a second report, wherein one or more bits of the first report include a most significant bit set corresponding to a transmit power, and one or more bits of the second report include a least significant bit set corresponding to the transmit power.

[0040] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, each report in the report set may be transmitted in a different uplink time slot.

[0041] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, a sounding reference signal may be transmitted after transmitting the one or more reports.

[0042] A method for wireless communication at a base station is described. The method may include: transmitting a request to a UE for one or more reports indicating a transmit power at which the UE transmits a sounding reference signal; receiving the one or more reports from the UE based on transmitting the request for the one or more reports; receiving the sounding reference signal; and communicating with the UE on a wireless channel based on the one or more reports and the sounding reference signal.

[0043] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: transmit a request to a UE for one or more reports indicating a transmit power at which the UE transmits a sounding reference signal; receive the one or more reports from the UE based on transmitting the request for the one or more reports; receive the sounding reference signal; and communicate with the UE on a wireless channel based on the one or more reports and the sounding reference signal.

[0044] Another apparatus for wireless communication at a base station is described. The apparatus may include: means for transmitting to a UE a request for one or more reports indicating a transmit power at which the UE transmits a sounding reference signal; means for receiving the one or more reports from the UE based on transmitting the request for the one or more reports; means for receiving the sounding reference signal; and means for communicating with the UE on a wireless channel based on the one or more reports and the sounding reference signal.

[0045] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: transmit a request to a UE for one or more reports indicating a transmit power at which the UE transmits a sounding reference signal; receive the one or more reports from the UE based on transmitting the request for the one or more reports; receive the sounding reference signal; and communicate with the UE on a wireless channel based on the one or more reports and the sounding reference signal.

[0046] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: determining a value of a first channel state parameter associated with the UE based on the one or more reports and a value of a second channel state parameter associated with the second UE, wherein communicating with the UE on the wireless channel can be based on determining the value of the first channel state parameter.

[0047] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, receiving a sounding reference signal from a UE may include operations, features, devices, or instructions for receiving the sounding reference signal via a configurable reflecting surface, and the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: determining a value of a scaling factor associated with a channel condition between the UE and the configurable reflecting surface based on the one or more reports, wherein determining the value of a first channel condition parameter includes combining the value of the scaling factor with the value of a second channel condition parameter.

[0048] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the first channel condition parameter and the second channel condition parameter may each be associated with the same channel condition between the configurable reflective surface and the base station.

[0049] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving a sounding reference signal from a UE may include operations, features, means, or instructions for receiving a sounding reference signal from the UE via a configurable reflective surface.

[0050] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting the request to the UE may include operations, features, means, or instructions for transmitting the request to the UE via a configurable reflective surface.

[0051] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving one or more reports from a base station may include operations, features, devices, or instructions for receiving one or more reports from a base station via a configurable reflective surface.

[0052] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: downlink control information includes a request, a media access control (MAC) control element includes a request, or radio resource control signaling includes a request.

[0053] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving one or more reports from a UE may include operations, features, devices, or instructions for receiving uplink control information including the one or more reports from the UE.

[0054] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, uplink control information may be periodically received via uplink control channel transmissions, received via uplink shared channel transmissions, or both.

[0055] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the one or more reports include a report set, wherein one or more bits from each report in the report set cumulatively indicate the transmit power.

[0056] In some examples of the methods, devices, and non-transitory computer-readable media described herein, a report set includes a first report and a second report, wherein one or more bits of the first report include a most significant bit set corresponding to a transmit power, and one or more bits of the second report include a least significant bit set corresponding to the transmit power.

[0057] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, each report in the report set may be transmitted in a different uplink time slot.

[0058] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, a sounding reference signal may be received after receiving the one or more reports. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 An example of a system for wireless communication supporting an SRS power control method for channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is illustrated.

[0061] Figure 2A and 2B An example of a wireless communication system supporting an SRS power control method for channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is illustrated.

[0062] Figure 3A and 3B An example of a wireless communication system supporting an SRS power control method for channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is illustrated.

[0063] Figure 4 and 5 An example of a process flow of an SRS power control method to support channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is illustrated.

[0064] Figure 6 and 7 A block diagram of a device supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is shown.

[0065] Figure 8A block diagram of a communication manager supporting an SRS power control method for channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is shown.

[0066] Fig. 9 A diagram of a system including a device supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is shown.

[0067] Fig.10 and 11 A block diagram of a device supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is shown.

[0068] Fig.12 A block diagram of a communication manager supporting an SRS power control method for channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is shown.

[0069] Fig.13 A diagram of a system including a device supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is shown.

[0070] Figures 14 to 18 A flow chart illustrating a method of SRS power control method supporting channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is shown.

[0071] Detailed Description

[0072] A user equipment (UE) may communicate with a base station via a reconfigurable smart surface, which may be an example of a configurable reflective surface. The RIS may deflect (e.g., reflect, refract) communications received from one of the UE or the base station to the other of the UE or the base station, respectively. In some examples, the base station may perform channel estimation. As part of performing the channel estimation, the base station may determine a value for a first channel state parameter by combining a second channel state parameter associated with a channel condition between the RIS and the base station and a third channel state parameter associated with a channel condition between the RIS. Explicitly recalculating the values ​​of the second and third channel state parameters for each UE communicating with the base station via the RIS may be associated with an overhead that increases linearly for each UE communicating with the base station.

[0073] To reduce the overhead, the base station may utilize one or more properties of the second and third channel state parameters. For example, for each UE, the path between the RIS and the base station may be at least approximately the same. In this way, the base station may determine that the second channel state parameter has at least approximately the same value for each UE. Additionally, the third channel state parameter that may be different for each UE may be a scaled value. In this way, as long as the base station has performed full channel estimation for the second UE and has determined the value of the third channel parameter for the first UE, the base station may approximate the value of the first channel state parameter for the first UE to a scaled version of the first channel state parameter for the second UE. In this way, the base station can perform channel estimation for multiple UEs with lower overhead.

[0074] The base station may determine the value of the third channel parameter using the sounding reference signal (SRS) transmit power at each UE. However, if the base station and the UE are communicating in a closed-loop power mode, the base station may not be able to accurately estimate the SRS transmit power. In order to enable the base station to estimate the transmit power, the base station may transmit a signaling to the UE indicating a switch from a closed-loop power mode to an open-loop power mode. Once the UE switches from a closed-loop power mode to an open-loop power mode, the UE may transmit a power headroom report (PHR) to the base station, which may indicate the difference between the transmit power of the UE transmitting the SRS and the maximum transmit power. The base station may use the PHR to determine the relative path loss associated with multiple UEs. Additionally or alternatively, the base station may transmit a request for one or more reports indicating the SRS transmit power, and may receive the one or more reports from the UE based on transmitting the request for the one or more reports.

[0075] Aspects of the present disclosure are initially described in the context of a wireless communication system. Additional aspects of the present disclosure are described in the context of a process flow. Aspects of the present disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow charts related to SRS power control methods for channel estimation of a reconfigurable smart surface link.

[0076] Figure 1 An example of a wireless communication system 100 that supports an SRS power control method for channel estimation of a reconfigurable smart surface link according to various aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more base stations 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, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0077] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be different forms of devices or devices with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0078] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be different forms of devices or devices with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), such as Figure 1 as shown in .

[0079] Each base station 105 may communicate with the core network 130, or communicate with each other, or both. For example, the base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3 or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105), or indirectly (e.g., via the core network 130), or directly and indirectly on the backhaul link 120 (e.g., via X2, Xn or other interfaces). In some examples, the backhaul link 120 may be or include one or more wireless links.

[0080] One or more of the base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a B node, an evolved B node (eNB), a next generation B node or a gigabit B node (any of which may be referred to as a gNB), a home B node, a home evolved B node, or other suitable terminology.

[0081] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as electrical appliances or vehicles, meters, etc.

[0082] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 as shown in .

[0083] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term "carrier" may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates 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 for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. The UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0084] The signal waveform transmitted on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM technology, a resource element may include a code element period (e.g., the duration of a modulation code element) and a subcarrier, where the code element period and the subcarrier spacing are 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 code rate of the modulation scheme, or both). Thus, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further improve the data rate or data integrity of communication with UE 115.

[0085] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, and the basic time unit can be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. Time intervals of communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0086] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), 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 code element periods (e.g., depending on the length of the cyclic prefix added before each code element period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini-time slots containing one or more code elements. Excluding the cyclic prefix, each code element period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating band.

[0087] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0088] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a number of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to the number 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 sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0089] In some examples, base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0090] The wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication, and may be supported by one or more mission-critical services (such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low latency, critical mission, and ultra-reliable low latency may be used interchangeably herein.

[0091] In some examples, UE 115 may also be able to communicate directly with other UE 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some examples, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between each UE 115 without involving the base station 105.

[0092] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), and the EPC or 5GC may include at least one control plane entity (e.g., a mobility management entity (MME), an 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), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access layer (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by a base station 105 associated with the core network 130. User IP packets may be delivered through a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to the IP service 150 of one or more network operators. The IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0093] Some network devices (such as base stations 105) may include subcomponents, such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or merged into a single network device (e.g., base station 105).

[0094] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). In general, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from about 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate various structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0095] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as the 5 GHz industrial, scientific, and medical (ISM) band). When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) may employ carrier sensing for conflict detection and avoidance. In some examples, operations in an unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in a licensed band. Operations in an unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among others.

[0096] The base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can support MIMO operations 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 the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having antenna ports of several rows and columns that the base station 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0097] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0098] The base station 105 or the UE 115 may use beam sweeping techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions. For example, the base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device (such as the base station 105) or a receiving device (such as the UE 115)) to identify a beam direction used by the base station 105 for later transmission or reception.

[0099] Some signals, such as data signals associated with a particular recipient device, may be transmitted by base station 105 in a single beam direction, e.g., a direction associated with a recipient device, such as UE 115. In some examples, a beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0100] In some examples, transmission by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may transmit a reference signal that may be precoded or unprecoded (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)). The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0101] A receiving device (e.g., UE 115) may try 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 base station 105. For example, the receiving device may try multiple reception directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "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 receiving a data signal). The single reception configuration may be aligned on a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0102] The wireless communication system 100 can be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer can be based on IP. The radio link control (RLC) layer can perform packet segmentation and reorganization to communicate on the logical channel. The media access control (MAC) layer can perform priority handling and multiplex the logical channel into the transport channel. The MAC layer can also use error detection technology, error correction technology, or both to support the retransmission of the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection of the radio bearer that supports user plane data between the UE 115 and the base station 105 or the core network 130. In the physical layer, the transport channel can be mapped to the physical channel.

[0103] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, and the like. These systems may be multiple access systems capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). A wireless network (e.g., a wireless local area network (WLAN), such as a Wi-Fi (i.e., an Institute of Electrical and Electronics Engineers (IEEE) 802.11) network) may include an access point (AP) that can communicate with one or more wireless or mobile devices. An AP may be coupled to a network (such as the Internet) and may enable a mobile device to communicate via the network (or to communicate with other devices coupled to the access point). A wireless device may communicate bidirectionally with a network device. For example, in a WLAN, a device may communicate with an associated AP via a downlink (e.g., a communication link from an AP to a device) and an uplink (e.g., a communication link from a device to an AP). A wireless personal area network (PAN), which may include a Bluetooth connection, may provide a short-range wireless connection between two or more paired wireless devices. For example, a wireless device (such as a cellular telephone) may utilize wireless PAN communications to exchange information, such as audio signals, with a wireless head mounted device.

[0104] In some examples, one or more wireless devices communicating in accordance with NR (e.g., 5G) may use massive MIMO. Massive MIMO may achieve high beamforming gain by using active antenna units (AAUs) and may involve the presence of separate radio frequency (RF) chains for each antenna port. In some examples, the use of massive MIMO may increase power consumption due to the use of AAUs. In order to assist in extending 5G coverage without significantly increasing power, a RIS (e.g., a configurable reflective surface) that deflects transmissions from wireless communication devices may be employed. The RIS may act as a primary passive device that reflects impinging waves in a desired direction. Additionally, the RIS may be controlled by the base station 105.

[0105] In general, the techniques described herein provide for a base station 105 to determine an SRS transmit power at a UE 115 so that when the UE 115 and the base station 105 communicate with each other via a RIS, the base station 105 can perform channel estimation. For example, the base station 105 can determine the SRS transmit power of the UE 115 and can communicate with the UE 115 based on the determined sounding reference signal transmit power. In some examples, the base station 105 can transmit signaling to the UE 115 indicating a switch from a first power control mode to a second power control mode. The UE 115 can transmit a PHR to the base station 105 and in the second power control mode, which the base station 105 can use to estimate the SRS transmit power and / or relative path loss associated with multiple UEs 115. In other examples, the base station 105 can transmit a request for one or more reports indicating the SRS transmit power based on the base station 105 operating in a closed-loop power control mode. The UE 115 can transmit one or more reports indicating the SRS transmit power to the base station 105.

[0106] Figure 2A An example of a wireless communication system 200 that supports an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200-a can implement aspects of the wireless communication system 100. For example, the base station 105-a can be as described with reference to Figure 1 The example of base station 105 described above, and UE 115-a can be as shown in reference Figure 1 An example of a UE 115 is described.

[0107] The wireless communication system 200-a may include a RIS 205-a, which includes N elements including an element 210-a. Each element of the RIS 205-a may be configured to deflect (e.g., reflect, refract) communications from the UE 115-a and the base station 105-a. Additionally, the wireless communication system 200-a may include a controller 215, which may be coupled to the base station 105-a and the RIS 205-a (e.g., via a wired or wireless connection). The controller 215 may be configured to receive commands from the base station 105-a and control the RIS 205-a according to the received commands. In some examples, the base station 105-a may communicate using M antennas (e.g., transmitting antennas). In some examples, the UE 115-a may communicate using K antennas (e.g., receiving antennas). In other examples, the base station 105-a may communicate with K UEs 115.

[0108] When performing channel estimation, the base station 105-a can communicate along a first path 220-a to estimate the condition of channel G, and can communicate along a second path including path 225-a and path 230-a to estimate the conditions of channel H1 and channel H2, respectively. G can be a direct channel between the base station 105-a and the UE 115-a; H1 can be a channel between the base station 105-a and the RIS205-a; H2 can be a channel between the RIS 205-a and the UE 115-a. In some examples, the RIS 205-a can be disabled (e.g., turned off) when the base station 105-a estimates the channel condition of channel G, and can be enabled (e.g., turned on) when the base station 105-a estimates the channel condition of H1 and H2. In some examples, the value of H1 can be common to each UE 115 communicating with the base station 105-a. As shown in reference Figure 2B As described, the base station 105a may exploit this channel property to reduce overhead while maintaining or improving channel estimation accuracy.

[0109] In some examples, the angle between paths 220-a and 225-a at base station 105-a may be given by θ1, and the angle between paths 225-a and 230-a may be given by is given by, and the angle between paths 230-a and 220-a can be given by H1 may have a size of LxN, and H2 may have a size of MxL. In some examples, H1 may be estimated as And H2 can be estimated as In some examples, the base station 105-a may also estimate the channel F. In some examples, the base station 105-a may perform a cascaded channel estimation, where H1H2 may be inseparable, or may be separable to the extent that it scales only (e.g., depending on the channel). In some examples, the channel H1 may be quasi-static because there may not be significant or dominant mobility associated with the path 225-a (e.g., the path 230-a may be line of sight (LOS) dominated). As such, H1 may be common to each UE 115 that communicates with the base station 105-a via the RIS 205-a. In some examples, the codebook for the RIS 205-a may be determined as the Φ with the maximum value for α (e.g., the minimum variance estimate for a single UE 115). H Φ=αI.

[0110] Figure 2BAn example of a wireless communication system 200-b supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200-b may implement aspects of the wireless communication system 100. For example, the base station 105-b may be as described with reference to Figure 1 The example of base station 105 described above, while UE 115-b and UE 115-c may be as described with reference to Figure 1 An example of a UE 115 is described.

[0111] The wireless communication system 200-b may include a RIS 205-b including N elements including an element 210-b. The RIS 205-b may be configured to deflect (e.g., reflect, refract) communications from a UE 115-b, a UE 115-c, and a base station 105-b. In some examples, the base station 105-b may communicate using M antennas (e.g., transmit antennas). In some examples, the base station 105-a may communicate with K UEs 115 including UEs 115-b and 115-c, where UE 115-b is the i-th UE 115 of the K UEs, and UE 115-c is the k-th UE 115 of the K UEs.

[0112] When performing channel estimation, the base station 105-b may communicate along the first path 220-b to estimate the channel condition h for the UE 115-b. k , and communicates along a second path 220-c to estimate the channel condition h for UE 115-c j For example, UE 115-b may transmit a first SRS to base station 105-b via first path 220-b, and UE 115-c may transmit a second SRS to base station 105-b via second path 220-c, and base station 105-a may use the first SRS to estimate h k And use the second SRS to estimate h j In some examples, RIS 205-a may estimate h at base station 105-b. k and h j Additionally, when performing channel estimation, base station 105-b may communicate along a third path including paths 225-b and 230-b to determine a channel condition parameter g for UE 115-b. k，n and may communicate along a fourth path including paths 225-b and 230-c to determine a channel condition parameter g for UE 115-c j，nFor example, UE 115-b may transmit a third SRS to base station 105-b via a third path, and UE 115-c may transmit a fourth SRS to base station 105-b via a fourth path, and base station 105-a may use the third SRS to estimate g k，n And use the fourth SRS to estimate g j，n .

[0113] In some examples, g k，n can be determined as g k，n =t k，n r n , where t k，n may be a channel condition parameter corresponding to the channel condition for path 230-b, and r n may be a channel condition parameter corresponding to the channel condition for path 225-b. Similarly, g j，n can be determined as g j，n =t j，n r n , where t j，n may be a channel condition parameter corresponding to the channel condition for path 230-c. Since the same path 225-b is used for channel estimation for both UEs 115-b and 115-c, the same channel condition parameter r n Can be used for channel estimation for both UE 115 - b and 115 - c .

[0114] In some examples, t k，n and t j，n can be a scaled value. Thus, g k，n and g j，n can be related to in Can be used to define the scaling factor λ k,n By leveraging this relationship, base station 105-b may perform channel estimation with less overhead than performing channel estimation for each of K UEs 115 individually. In some examples, base station 105-b performing channel estimation may involve base station 105-b performing a three-step estimation process. For example, in the case where RIS 205-b is disabled, base station 105-b may determine [h1, ..., h k ] (e.g., base station 105-b may perform direct channel estimation of H[i], which may be associated with overhead 1). Next, with RIS 205-b enabled, base station 105-b may estimate g j，n (For example, where j=1). For example, base station 105-b may estimate Among them G j[i] may have size m x n and where t = 1, 2, ..., N. In some such examples, the overhead may be N. Next, with RIS 205-b still enabled, base station 105-b may estimate λ for each of the remaining K UEs 115 k，n , and can be calculated based on g k，n =λ k， n g j，n To determine g k,n For example, base station 105-b may determine where λ k may have size Nx1 and where In some such examples, the overhead can be In some cases, the sums may be orthogonal.

[0115] Performing the three-step estimation may have one or more advantages. For example, base station 105-b may avoid directly estimating g for all UEs 115 except one of UEs 115. k,n Additionally, base station 105-b may have a reduced number of channel coefficients and may also have reduced pilot overhead. The pilot overhead may be given as

[0116] In some examples, for subsequent channel estimation, the three-step estimation process can be compressed into two steps. For example, as in three steps and when RIS 205-b is disabled, base station 105-b can determine [h1, ..., h k ] (e.g., base station 105-b may perform direct channel estimation of H[i], which may be associated with an overhead of 1). For the second step, if RIS 205-b is enabled, base station 105-b may estimate λ for each of K UEs 115. k，n For example, base station 105-b may determine where λ k can have size Nx1, where And where G[i] can be reused according to the three-step estimation process. In some such examples, the overhead can be In some cases, the sums may be orthogonal.

[0117] In some examples, UE 115-b may use a different SRS transmit power to transmit SRS along a third path including paths 225-b and 230-b compared to the SRS transmit power used by UE 115-c to transmit SRS along a fourth path including paths 225-b and 230-c.

[0118] Thus, when determining the scaling factor (e.g. λ k，n and / or λ k ), base station 105-b may account for different SRS transmit powers at different UEs 115. However, if base station 105-b fails to identify the SRS transmit power for each UE 115, base station 105-b may be unable to normalize the scaling factor and, therefore, may not be able to perform channel estimation. One example where base station 105-b may be unable to identify the SRS transmit power is when base station 105-b and UEs 115-b and / or 115-c are operating in a closed-loop power control mode.

[0119] The method as described herein is intended to enable a base station (such as base station 105-b) to estimate SRS transmit power of UEs (e.g., UEs 115-b and 115-c) communicating via a RIS (e.g., RIS205-b). For example, base station 105-b may transmit signaling to UE 115-b and / or 115-c indicating a switch from a first power control mode (e.g., a closed-loop power control mode) to a second power control mode (e.g., an open-loop power control mode). UE 115-b and / or 115-c may switch to the second power control mode and may transmit a PHR to base station 105-b, which may indicate a power headroom that base station 105-b may use to estimate SRS transmit power and / or relative path loss associated with multiple UEs 115 (e.g., UE 115-b and 115-c). Additional details regarding this scenario may be found in Figure 3A Additionally or alternatively, base station 105-b may transmit to UE 115-b and / or 115-c a request for one or more reports indicating SRS transmit power at which UE 115-b and / or 115-c transmits the corresponding SRS. UE 115-b and / or 115-c may transmit the one or more reports to base station 105-b based on receiving the reports, and may determine the SRS transmit power based on the one or more reports. Additional details about this scenario may be found in Figure 3B Give a description.

[0120] Figure 3A An example of a wireless communication system 300 that supports an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 300-a can implement aspects of the wireless communication systems 100 and / or 200. For example, the base station 105-c can be as described in reference Figure 1 The example of base station 105 described above, UE 115-d may be as shown in reference Figure 1The described examples of UE 115, and RIS 205-c may be examples of RIS 205-a and / or 205-b as described with reference to FIG. 2.

[0121] Initially, the base station 105-c and the UE 115-d may communicate in a closed-loop power control mode. However, when the base station 105-c is to perform channel estimation, the base station 105-c may transmit signaling 305 to the UE 115-d indicating a switch from the closed-loop power control mode to the open-loop power control mode. In some examples, the RIS 205-c may reflect the signaling 305 to the UE 115-d. Alternatively, the base station 105-c may transmit the signaling 305 directly to the UE 115-d. In some examples, the signaling may include downlink control information (DCI) indicating the switch, a media access control (MAC) control element indicating the switch, or a radio resource control (RRC) signaling indicating the switch. In some examples, the base station 105-c may transmit the signaling 305 to the UE 115-d indicating a switch from the open-loop power control mode to the closed-loop power control mode.

[0122] After receiving the signaling 305, the UE 115-d may switch to an open-loop power control mode and may transmit a report indicating a power headroom (e.g., PHR 310) associated with an SRS transmission transmitted from the UE 115-d to the base station 105-c in the open-loop power control mode. In some examples, the RIS 205-c may reflect the PHR 310 to the base station 105-c. Alternatively, the UE 115-d may transmit the PHR 310 directly to the base station 105-c.

[0123] After receiving the PHR 310, the base station 105-c may estimate the SRS transmit power and / or relative path loss associated with the plurality of UEs 115 based on receiving the PHR 310. For example, the PHR 310 may indicate how much higher the power at which the UE 115-d may transmit the SRS. Based on the indication, the base station 105-c may estimate the SRS transmit power and / or relative path loss associated with the plurality of UEs 115. Once the base station 105-c has estimated the SRS transmit power, the base station 105-c may estimate the SRS transmit power and / or relative path loss associated with the plurality of UEs 115 based on the estimated SRS transmit power and a value of a second channel condition parameter associated with the second UE 115 (e.g., if the second UE 115 is the jth UE 115 among the K UEs 115 and the RIS 205-c has N elements, then g j，n ) to determine the value of the first channel condition parameter (eg, if UE 115-d is the kth UE 115 among K UEs 115 and RIS 205-c has N elements, then g k，nIn some examples, base station 105-c may determine a value of a scaling factor (eg, λ ) associated with the channel condition between UE 115-d and RIS 205-c based on the estimated SRS transmit power. k，n In some such examples, a value of a first channel condition parameter (e.g., g k，n ) may involve combining the value of the scaling factor with the value of the second channel condition parameter (eg, g k,n =λ k，n g j，n In some examples, UE 115-d may transmit an SRS to base station 105-c (e.g., via RIS 205-c), and base station 105-c may determine a scaling factor based on receiving the SRS. In some examples, the first channel condition parameter and the second channel condition parameter may each be related to the same channel condition between RIS 205-c and base station 105-c (e.g., r n ). In some examples, the base station 105-c may use the estimated SRS transmit power to normalize the scaling factor.

[0124] Figure 3B An example of a wireless communication system 300-b supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 300-b may implement aspects of the wireless communication systems 100 and / or 200. For example, the base station 105-d may be as described in reference Figure 1 The example of base station 105 described above, UE 115-e may be as shown in FIG. Figure 1 The described examples of UE 115, and RIS 205-d may be examples of RIS 205-a and / or 205-b as described with reference to FIG. 2.

[0125] Initially, the base station 105-d and the UE 115-e may communicate in a closed-loop power control mode. When the base station 105-c is to perform channel estimation, the base station 105-d may transmit a request 315 for one or more reports indicating the transmit power at which the UE 115-e transmits the SRS. In some examples, the RIS 205-d may reflect the request 315 to the UE 115-e. Alternatively, the base station 105-d may transmit the request 315 directly to the UE 115-e. In some examples, downlink control information (DCI), a media access control (MAC) control element, or a radio resource control (RRC) signaling may indicate the request.

[0126] After receiving the request, the UE 115-e may transmit one or more reports 320 to the base station 105-d. In some examples, the UE 115-e may transmit the one or more reports via uplink control information (UCI), which is periodically transmitted (e.g., via a physical uplink control channel (PUCCH) transmission) and / or transmitted via a physical uplink shared channel (PUSCH) transmission. In some examples, the RIS 205-d may reflect the one or more reports 320 to the base station 105-d. Alternatively, the UE 115-e may transmit the one or more reports 320 directly to the base station 105-d. In some examples, the one or more reports may include a report set, wherein one or more bits from each report in the report set cumulatively indicate the SRS transmit power. For example, the report set may include a first report and a second report, wherein one or more bits of the first report include a set of most significant bits (MSBs) corresponding to the SRS transmit power, and one or more bits of the second report include a set of least significant bits (LSBs) corresponding to the transmit power. In some examples, each report in the report set is transmitted in a different uplink time slot. Additionally or alternatively, each report in the report set can be transmitted in a single time slot (e.g., simultaneously).

[0127] After receiving the one or more reports, base station 105-d may determine an SRS transmit power. After determining the SRS transmit power, base station 105-d may determine an SRS transmit power based on the determined SRS transmit power and a value of a second channel condition parameter associated with second UE 115 (e.g., if second UE 115 is the jth UE 115 of K UEs 115 and RIS 205-c has N elements, then g j，n ) to determine the value of the first channel condition parameter (eg, if UE 115-e is the kth UE 115 among K UEs 115 and RIS 205-c has N elements, then g k，n In some examples, base station 105-d may determine a value of a scaling factor (eg, λ ) associated with the channel condition between UE 115-e and RIS 205-e based on the determined SRS transmit power. k，n In some such examples, a value of a first channel condition parameter (e.g., g k，n ) may involve combining the value of the scaling factor with the value of the second channel condition parameter (eg, g k，n =λ k，n g j，n). In some examples, UE 115-e may transmit the SRS to base station 105-d (e.g., via RIS 205-d), and base station 105-d may determine the scaling factor based on receiving the SRS. In some examples, the first channel condition parameter and the second channel condition parameter may each be related to the same channel condition (e.g., r n ) is associated. In some examples, the base station 105-d can use the determined SRS transmit power to normalize the scaling factor. It should be noted that in some examples, the UE 115-e and the base station 105-d can communicate the request 315 and the one or more reports 320 while operating in an open loop power control mode.

[0128] Figure 4 An example of a process flow 400 of an SRS power control method for supporting channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is illustrated. In some examples, the process flow 400 can be implemented by aspects of the wireless communication system 100 and / or 200. For example, the base station 105-e can be as described with reference to Figure 1 The example of base station 105 described above, and UE 115-f can be as shown in reference Figure 1 An example of a UE 115 is described.

[0129] At 405, the base station 105-e may transmit signaling to the UE 115-f indicating a switch from a first power control mode to a second power control mode for SRS transmission. In some examples, the first power control mode may include one of an open-loop power control mode or a closed-loop power control mode, and the second power control mode may include the other of the open-loop power control mode and the closed-loop power control mode. In some examples, the signaling indicating the switch may be communicated via a RIS. In some examples, the signaling may include a DCI indicating the switch, a MAC-CE indicating the switch, or RRC signaling indicating the switch.

[0130] At 410, UE 115-f may transmit a report indicating a power headroom (eg, PHR) associated with sounding reference signal transmission to base station 105-e and in the second power control mode based on receiving the signaling indicating the switch. In some examples, the report indicating the power headroom may be communicated via a RIS.

[0131] At 415 , UE 115 - f may transmit an SRS associated with a report indicating a power headroom to the base station and in the second power control mode.

[0132] At 420 , the base station 105 - e may estimate the SRS transmit power and / or relative path loss based on receiving the report indicating the power headroom.

[0133] At 425, the base station 105-e and the UE 115-f may communicate with each other on a wireless channel based on communicating the report indicating the power headroom. In some examples, the base station 105-e may perform the communication based on the estimated SRS transmit power. In some examples, the communication may be based on the UE 115-f communicating a sounding reference signal with the base station 105-e.

[0134] In some examples, the base station 105-e may determine a value of a first channel condition parameter associated with the UE 115-f based on an estimated sounding reference signal transmit power and / or relative path loss associated with a report indicating power headroom and a value of a second channel condition parameter associated with the second UE 115. In some such examples, the base station 105-e communicating with the UE 115-f may be based on determining the value of the first channel condition parameter. In some cases where the base station 105-e receives a report from the UE 115-f via the RIS, the base station 105-e may determine a value of a scaling factor associated with a channel condition between the UE 115-f and the RIS based on an estimated sounding reference signal transmit power associated with a report indicating power headroom, wherein determining the value of the first channel condition parameter includes combining the value of the scaling factor with the value of the second channel condition parameter. In some examples, the base station 105-e may receive an SRS from the UE 115-f and may determine a value of the scaling factor based on receiving the SRS. In some examples, the first channel condition parameter and the second channel condition parameter may each be associated with the same channel condition between the RIS and the base station.

[0135] Figure 5 An example of a process flow 500 of an SRS power control method for supporting channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is illustrated. In some examples, the process flow 500 can be implemented by aspects of the wireless communication system 100 and / or 200. For example, the base station 105-f can be as described with reference to Figure 1 The example of the base station 105 described above, and the UE 115-g can be as shown in FIG. Figure 1 An example of a UE 115 is described.

[0136] At 505, the base station 105-f may transmit to the UE 115-g a request for one or more reports indicating the transmit power (e.g., SRS transmit power) of the sounding reference signal transmitted by the UE 115-g. In some examples, the base station 105-f may transmit the request based on the base station 105-f operating in a closed-loop power mode, and the UE 115-g may receive the request based on the UE 115-g operating in a closed-loop power mode. The request may be communicated to the UE 115-g via a RIS. In some examples, the request may be included in a DCI, MAC-CE, or RRC signaling. In some examples, the base station 105-f may transmit the request when operating in an open-loop power control mode and / or the UE 115-g may receive the request when operating in an open-loop power control mode.

[0137] At 510, UE 115-g may transmit the one or more reports to base station 105-f based on receiving a request for one or more reports. The one or more reports may be communicated to base station 105-f via RIS. In some examples, the one or more reports may be included in UCI. In some such examples, UCI may be transmitted periodically via uplink control channel transmission, transmitted via uplink shared channel transmission, or both. In some examples, the one or more reports may include a report set, wherein one or more bits from each report in the report set cumulatively indicate the transmit power. In some such examples, the report set includes a first report and a second report, wherein one or more bits of the first report include a set of MSBs corresponding to the transmit power, and one or more bits of the second report include a set of LSBs corresponding to the transmit power. Each report in the report set may be transmitted in a different uplink time slot. In some examples, UE 115-g may transmit one or more reports when operating in an open-loop power control mode and / or base station 105-f may receive the one or more reports when operating in an open-loop power control mode.

[0138] At 515, UE 115-g may transmit an SRS to base station 105-f. The SRS may be communicated to base station 105-f via the RIS. In some examples, the SRS is communicated after one or more reports are communicated.

[0139] At 520, base station 105-f may identify an SRS transmit power based on the one or more reports. In some examples, base station 105-f may determine a value of a first channel condition parameter associated with UE 115-g based on the received report and a value of a second channel condition parameter associated with second UE 115. In an example of receiving the SRS via a RIS, base station 105-e may determine a value of a scaling factor associated with a channel condition between UE 115-g and the RIS based on the received report, wherein determining the value of the first channel condition parameter includes combining the value of the scaling factor and the value of the second channel condition parameter. In some examples, the first channel condition parameter and the second channel condition parameter may each be associated with the same channel condition between the RIS and the base station.

[0140] At 525, UE 115-g and base station 105-f may communicate with each other on the wireless channel based on communicating one or more report and sounding reference signals. In some examples, communicating with UE 115-g on the wireless channel is based on base station 105-f determining a value of a first channel condition parameter.

[0141] Figure 6 A block diagram 600 of a device 605 supporting an SRS power control method for channel estimation of a reconfigurable smart surface link according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0142] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to SRS power control methods for channel estimation of reconfigurable smart surface links, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Fig. 9 Examples of aspects of the described transceiver 915. The receiver 610 may utilize a single antenna or utilize a collection of antennas.

[0143] The communication manager 615 may receive signaling from a base station indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; transmit a report indicating a power headroom associated with the sounding reference signal transmission to the base station and in the second power control mode based on receiving the signaling indicating the switch; and communicate with the base station on a wireless channel based on transmitting the report indicating the power headroom. The communication manager 615 may also receive a request from the base station for one or more reports indicating a transmit power of a UE transmitting a sounding reference signal; transmit the one or more reports to the base station based on receiving the request for the one or more reports; transmit the sounding reference signal to the base station; and communicate with the base station on a wireless channel based on the one or more reports and the sounding reference signal. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0144] The communication manager 615 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0145] The communication manager 615 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0146] The transmitter 620 can transmit signals generated by other components of the device 605. In some examples, the transmitter 620 can be co-located with the receiver 610 in a transceiver module. For example, the transmitter 620 can be a reference Fig. 9 Examples of aspects of the described transceiver 915. The transmitter 620 may utilize a single antenna or utilize a collection of antennas.

[0147] Figure 7A block diagram 700 of a device 705 supporting an SRS power control method for channel estimation of a reconfigurable smart surface link according to aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 750. The device 705 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0148] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to SRS power control methods for channel estimation of reconfigurable smart surface links, etc.). The information may be passed to other components of the device 705. The receiver 710 may be a reference Fig. 9 Examples of various aspects of the described transceiver 915. The receiver 710 may utilize a single antenna or utilize a set of antennas.

[0149] The communication manager 715 may be an example of aspects of the communication manager 615 as described herein. The communication manager 715 may include a handover signaling receiver 720, a PHR transmitter 725, a base station communication component 730, an SRS transmitter 735, a request receiver 740, and a report transmitter 745. The communication manager 715 may be an example of aspects of the communication manager 910 described herein.

[0150] The switching signaling receiver 720 may receive signaling from the base station indicating switching from the first power control mode to the second power control mode for sounding reference signal transmission.

[0151] The PHR transmitter 725 may transmit a report indicating a power headroom associated with sounding reference signal transmission to the base station and in the second power control mode based on receiving the signaling indicating the switch.

[0152] Base station communicating component 730 can communicate with a base station over a wireless channel based on transmitting a report indicating a power headroom.Base station communicating component 730 can communicate with a base station over a wireless channel based on one or more reports and a sounding reference signal.

[0153] The SRS transmitter 735 may transmit a sounding reference signal to the base station.

[0154] The request receiver 740 may receive a request from a base station for one or more reports indicating a transmit power at which a UE transmits a sounding reference signal.

[0155] The report transmitter may transmit the one or more reports to the base station based on receiving a request for the one or more reports.

[0156] The transmitter 750 may transmit signals generated by other components of the device 705. In some examples, the transmitter 750 may be co-located with the receiver 710 in a transceiver module. For example, the transmitter 750 may be a reference Fig. 9 Examples of aspects of the described transceiver 915. The transmitter 750 may utilize a single antenna or utilize a collection of antennas.

[0157] Figure 8 A block diagram 800 of a communication manager 805 supporting an SRS power control method for channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is shown. The communication manager 805 may be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 may include a handover signaling receiver 810, a PHR transmitter 815, a base station communication component 820, an SRS transmitter 825, a request receiver 830, and a report transmitter 835. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0158] The switching signaling receiver 810 may receive signaling from a base station indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission. In some examples, the switching signaling receiver 810 may receive signaling indicating the switch from a base station via a configurable reflective surface. In some cases, the first power control mode includes one of an open-loop power control mode or a closed-loop power control mode, and the second power control mode includes the other of the open-loop power control mode and the closed-loop power control mode. In some cases, the signaling includes downlink control information indicating the switch, a media access control (MAC) control element indicating the switch, or a radio resource control signaling indicating the switch.

[0159] The PHR transmitter 815 may transmit a report indicating a power headroom associated with sounding reference signal transmission to the base station and in the second power control mode based on receiving the signaling indicating the switch.In some examples, the PHR transmitter 815 may transmit the report to the base station via a configurable reflective surface.

[0160] Base station communication component 820 can communicate with a base station over a wireless channel based on transmitting a report indicating a power headroom. In some examples, base station communication component 820 can communicate with a base station over a wireless channel based on one or more reports and a sounding reference signal.

[0161] The SRS transmitter 825 may transmit a sounding reference signal to the base station. In some examples, the sounding reference signal may be transmitted after transmitting one or more reports. In some examples, the SRS transmitter 825 may transmit a sounding reference signal associated with a report indicating power headroom to the base station and in a second power control mode, wherein communication with the base station is based on transmitting the sounding reference signal. In some examples, the SRS transmitter 825 may transmit the sounding reference signal to the base station via a configurable reflective surface.

[0162] The request receiver 830 may receive a request from a base station for one or more reports indicating a transmit power at which a UE transmits a sounding reference signal. In some examples, the request receiver 830 may receive the request from the base station via a configurable reflective surface. In some examples, downlink control information includes the request, a medium access control (MAC) control element includes the request, or radio resource control signaling includes the request.

[0163] The report transmitter 835 may transmit the one or more reports to the base station based on receiving a request for one or more reports. In some examples, the report transmitter 835 may transmit the one or more reports to the base station via a configurable reflective surface. In some examples, the report transmitter 835 may transmit uplink control information including the one or more reports to the base station. The uplink control information may be transmitted periodically via an uplink control channel transmission, transmitted via an uplink shared channel transmission, or both. A report set may include a first report and a second report, wherein one or more bits of the first report include a most significant bit set corresponding to the transmit power, and one or more bits of the second report include a least significant bit set corresponding to the transmit power. Each report in the report set is transmitted in a different uplink time slot. In some examples, the one or more reports include a report set, wherein one or more bits from each report in the report set cumulatively indicate the transmit power.

[0164] Fig. 9 A diagram of a system 900 including a device 905 supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to various aspects of the present disclosure is shown. The device 905 may be an example of a device 605, a device 705, or a UE 115 as described herein or include components of the above devices. The device 905 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 910, a transceiver 915, an antenna 920, a memory 925, and a processor 935. These components may be in electronic communication via one or more buses (e.g., bus 940).

[0165] The communication manager 910 may receive signaling from a base station indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; transmit a report indicating a power headroom associated with the sounding reference signal transmission to the base station and in the second power control mode based on receiving the signaling indicating the switch; and communicate with the base station on a wireless channel based on transmitting the report indicating the power headroom. The communication manager 910 may also receive a request from the base station for one or more reports indicating a transmit power of a UE transmitting a sounding reference signal; transmit the one or more reports to the base station based on receiving the request for the one or more reports; transmit the sounding reference signal to the base station; and communicate with the base station on a wireless channel based on the one or more reports and the sounding reference signal.

[0166] The transceiver 915 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 915 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 915 can also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0167] In some cases, a wireless device may include a single antenna 920. However, in some cases, the device may have more than one antenna 920, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0168] The memory 925 may include random access memory (RAM) and read-only memory (ROM). The memory 925 may store computer-readable, computer-executable code 930 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 925 may include, among other things, a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0169] The code 930 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 930 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 930 may not be directly executed by the processor 935, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0170] The processor 935 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 935 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 935. The processor 935 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 925) so that the device 905 performs various functions (e.g., functions or tasks of an SRS power control method for channel estimation supporting a reconfigurable smart surface link).

[0171] Fig.10 A block diagram 1000 of a device 1005 supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of a base station 105 as described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1020. The device 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0172] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to SRS power control methods for channel estimation of reconfigurable smart surface links, etc.). The information may be passed to other components of the device 1005. The receiver 1010 may be a reference Fig.13 Examples of various aspects of the transceiver 1320 are described. The receiver 1010 may utilize a single antenna or utilize a set of antennas.

[0173] The communication manager 1015 may transmit signaling to the UE indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; receive a report indicating a power headroom associated with the sounding reference signal transmission from the UE and in the second power control mode based on transmitting the signaling indicating the switch; estimate a sounding reference signal transmit power based on receiving the report indicating the power headroom; and communicate with the UE on a wireless channel based on the estimated sounding reference signal transmit power. The communication manager 1015 may also transmit a request to the UE for one or more reports indicating a transmit power at which the UE transmits a sounding reference signal; receive the one or more reports from the UE based on transmitting the request for the one or more reports; receive the sounding reference signal from the UE; and communicate with the UE on a wireless channel based on the one or more reports and the sounding reference signal. The communication manager 1015 may be an example of aspects of the communication manager 1310 described herein.

[0174] The communication manager 1015 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1015 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device designed to perform the functions described in this disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0175] The communication manager 1015 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 1015 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1015 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0176] The transmitter 1020 may transmit signals generated by other components of the device 1005. In some examples, the transmitter 1020 may be co-located with the receiver 1010 in a transceiver module. For example, the transmitter 1020 may be a reference Fig.13 Examples of aspects of the described transceiver 1320. The transmitter 1020 may utilize a single antenna or utilize a collection of antennas.

[0177] Fig.11A block diagram 1100 of a device 1105 supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is shown. The device 1105 may be an example of aspects of the device 1005 or base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1155. The device 1105 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0178] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to SRS power control methods for channel estimation of reconfigurable smart surface links, etc.). The information may be passed to other components of the device 1105. The receiver 1110 may be a reference Fig.13 Examples of various aspects of the described transceiver 1320. The receiver 1110 may utilize a single antenna or utilize a collection of antennas.

[0179] The communication manager 1115 may be an example of aspects of the communication manager 1015 as described herein. The communication manager 1115 may include a handover signaling transmitter 1120, a PHR receiver 1125, an SRS transmit power estimation component 1130, a UE communication component 1135, an SRS receiver 1140, a request transmitter 1145, and a report receiver 1150. The communication manager 1115 may be an example of aspects of the communication manager 1310 described herein.

[0180] The switching signaling transmitter 1120 may transmit signaling to the UE indicating switching from the first power control mode to the second power control mode for sounding reference signal transmission.

[0181] The PHR receiver 1125 may receive a report indicating a power headroom associated with sounding reference signal transmission from the UE and in the second power control mode based on transmitting the signaling indicating the switch.

[0182] SRS transmit power estimating component 1130 can estimate the sounding reference signal transmit power based on receiving the report indicating the power headroom.

[0183] UE communication component 1135 can communicate with the UE on a wireless channel based on the estimated sounding reference signal transmit power.UE communication component 1135 can communicate with the UE on a wireless channel based on one or more reports and the sounding reference signal.

[0184] The SRS receiver 1140 may receive a sounding reference signal from a UE.

[0185] The request transmitter 1145 may transmit a request to the UE for one or more reports indicating the transmit power at which the UE transmits the sounding reference signal.

[0186] Report receiver 1150 may receive the one or more reports from the UE based on transmitting a request for the one or more reports.

[0187] The transmitter 1155 may transmit signals generated by other components of the device 1105. In some examples, the transmitter 1155 may be co-located with the receiver 1110 in a transceiver module. Fig.13 Examples of various aspects of the described transceiver 1320. The transmitter 1155 may utilize a single antenna or utilize a collection of antennas.

[0188] Fig.12 A block diagram 1200 of a communication manager 1205 supporting an SRS power control method for channel estimation for a reconfigurable smart surface link in accordance with aspects of the present disclosure is shown. The communication manager 1205 may be an example of aspects of the communication manager 1015, the communication manager 1115, or the communication manager 1310 described herein. The communication manager 1205 may include a handover signaling transmitter 1210, a PHR receiver 1215, an SRS transmit power estimation component 1220, a UE communication component 1225, an SRS receiver 1230, a request transmitter 1235, and a report receiver 1240. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0189] The switching signaling transmitter 1210 may transmit to the UE a signaling indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission. In some examples, the switching signaling transmitter 1210 may transmit to the UE a signaling indicating the switch via reflection or refraction through a configurable reflective surface. In some cases, the first power control mode includes one of an open-loop power control mode or a closed-loop power control mode, and the second power control mode includes the other of the open-loop power control mode and the closed-loop power control mode. In some cases, the signaling includes downlink control information indicating the switch, a media access control (MAC) control element indicating the switch, or a radio resource control signaling indicating the switch.

[0190] The PHR receiver 1215 may receive a report indicating a power headroom associated with the sounding reference signal transmission from the UE and in the second power control mode based on transmitting the signaling indicating the switch.In some examples, the PHR receiver 1215 may receive the report indicating the power headroom from the UE via a configurable reflective surface.

[0191] The SRS transmit power estimation component 1220 may estimate the sounding reference signal transmit power based on receiving a report indicating power headroom. In some examples, the SRS transmit power estimation component 1220 may determine a value of a first channel state parameter associated with the UE based on an estimated sounding reference signal transmit power associated with the report indicating power headroom and a value of a second channel state parameter associated with the second UE, wherein communicating with the UE on the wireless channel is based on determining the value of the first channel state parameter. In some examples, the report indicating power headroom may be received via a configurable reflective surface. In some such examples, the SRS transmit power estimation component 1220 may determine a value of a scaling factor associated with a channel condition between the UE and the configurable reflective surface based on an estimated sounding reference signal transmit power associated with the report indicating power headroom, wherein determining the value of the first channel state parameter includes combining the value of the scaling factor and the value of the second channel state parameter. In some examples, the first channel state parameter and the second channel state parameter may be associated with the same channel condition between the configurable reflective surface and the base station.

[0192] In some examples, the SRS transmit power estimation component 1220 may determine a value of a first channel state parameter associated with the UE based on the received report and a value of a second channel state parameter associated with the second UE, wherein communicating with the UE on the wireless channel is based on determining the value of the first channel state parameter. In some examples, a sounding reference signal from the UE may be received via a configurable reflecting surface. In some such examples, the SRS transmit power estimation component 1220 may determine a value of a scaling factor associated with a channel condition between the UE and the configurable reflecting surface based on the received report, wherein determining the value of the first channel state parameter includes combining the value of the scaling factor and the value of the second channel state parameter. In some examples, the first channel state parameter and the second channel state parameter may each be associated with the same channel condition between the configurable reflecting surface and the base station.

[0193] UE communication component 1225 can communicate with the UE on the wireless channel based on the estimated sounding reference signal transmit power. In some examples, UE communication component 1225 can communicate with the UE on the wireless channel based on one or more reports and the sounding reference signal.

[0194] The SRS receiver 1230 may receive a sounding reference signal from the UE when operating in a closed-loop power control mode. In some examples, the SRS receiver 1230 may receive a sounding reference signal associated with a report indicating a power headroom from the UE and in a second power control mode, wherein determining a value of the scaling factor is based on receiving the sounding reference signal. In some examples, the SRS receiver 1230 may receive the sounding reference signal from the UE via a configurable reflective surface. In some examples, the sounding reference signal may be received after receiving one or more reports.

[0195] The request transmitter 1235 may transmit a request to the UE for one or more reports indicating a transmit power at which the UE transmits a sounding reference signal. In some examples, the request transmitter 1235 may transmit the request to the UE via a configurable reflective surface. In some examples, downlink control information includes the request, a medium access control (MAC) control element includes the request, or radio resource control signaling includes the request.

[0196] The report receiver 1240 may receive the one or more reports from the UE based on transmitting a request for one or more reports. In some examples, the report receiver 1240 may receive the one or more reports from the base station via a configurable reflective surface. In some examples, the report receiver 1240 may receive uplink control information including the one or more reports from the UE. In some examples, the uplink control information may be received periodically via an uplink control channel transmission, received via an uplink shared channel transmission, or both. In some examples, the one or more reports include a report set, wherein one or more bits from each report in the report set cumulatively indicate the transmit power. The report set may include a first report and a second report, wherein one or more bits of the first report include a most significant bit set corresponding to the transmit power, and one or more bits of the second report include a least significant bit set corresponding to the transmit power. Each report in the report set is transmitted in a different uplink time slot.

[0197] Fig.13A diagram of a system 1300 including a device 1305 supporting an SRS power control method for channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure is shown. The device 1305 may be an example of or include components of a device 1005, a device 1105, or a base station 105 as described herein. The device 1305 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1310, a network communication manager 1315, a transceiver 1320, an antenna 1325, a memory 1330, a processor 1340, and an inter-station communication manager 1345. These components may be in electronic communication via one or more buses (e.g., a bus 1350).

[0198] The communication manager 1310 may transmit to the UE a signaling indicating a switch from a first power control mode to a second power control mode for sounding reference signal transmission; receive from the UE and in the second power control mode a report indicating a power headroom associated with the sounding reference signal transmission based on transmitting the signaling indicating the switch; estimate a sounding reference signal transmit power based on receiving the report indicating the power headroom; and communicate with the UE on a wireless channel based on the estimated sounding reference signal transmit power. The communication manager 1310 may also transmit to the UE a request for one or more reports indicating a transmit power at which the UE transmits a sounding reference signal; receive from the UE the one or more reports based on transmitting the request for the one or more reports; receive the sounding reference signal from the UE; and communicate with the UE on a wireless channel based on the one or more reports and the sounding reference signal.

[0199] The network communications manager 1315 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1315 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0200] The transceiver 1320 may communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1320 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1320 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0201] In some cases, a wireless device may include a single antenna 1325. However, in some cases, the device may have more than one antenna 1325, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0202] Memory 1330 may include RAM and ROM. Memory 1330 may store computer-readable, computer-executable code 1335 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 1330 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0203] The code 1335 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1335 may not be directly executed by the processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0204] Processor 1340 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1340 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., functions or tasks of an SRS power control method for channel estimation supporting a reconfigurable smart surface link).

[0205] The inter-site communication manager 1345 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in cooperation with other base stations 105. For example, the inter-site communication manager 1345 may coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-site communication manager 1345 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0206] Fig.14 FIG. 1 is a flowchart illustrating a method 1400 for SRS power control in support of channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. Figures 6 to 9The communication manager described herein may be used to perform the functions described herein. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0207] At 1405, the UE may receive signaling from a base station indicating switching from a first power control mode to a second power control mode for sounding reference signal transmission. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed as described with reference to Figures 6 to 9 The described handover signaling is performed by a receiver.

[0208] At 1410, the UE may transmit a report indicating a power headroom associated with the sounding reference signal transmission to the base station and in a second power control mode based on receiving the signaling indicating the switch. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed as described with reference to Figures 6 to 9 The described PHR transmitter is implemented.

[0209] At 1415, the UE may communicate with the base station on the wireless channel based on transmitting a report indicating the power headroom. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed as described with reference to Figures 6 to 9 The described base station communication components are implemented.

[0210] Fig.15 FIG. 1 is a process flow diagram illustrating a method 1500 for SRS power control in support of channel estimation for a reconfigurable smart surface link in accordance with various aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE 115 or a component thereof as described herein. Figures 6 to 9 The communication manager described herein may be used to perform the functions described herein. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0211] At 1505, the UE may receive signaling from a base station indicating switching from a first power control mode to a second power control mode for sounding reference signal transmission. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described with reference to Figures 6 to 9 The described handover signaling is performed by a receiver.

[0212] At 1510, the UE may transmit a report indicating a power headroom associated with the sounding reference signal transmission to the base station and in a second power control mode based on receiving the signaling indicating the switch. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described with reference to Figures 6 to 9 The described PHR transmitter is implemented.

[0213] At 1515, the UE may transmit a sounding reference signal associated with a report indicating the power headroom to the base station and in the second power control mode. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 6 to 9 The SRS transmitter described is performed.

[0214] At 1520, the UE may communicate with the base station on the wireless channel based on transmitting the report indicating the power headroom and transmitting the sounding reference signal. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed as described with reference to Figures 6 to 9 The described base station communication components are implemented.

[0215] Fig.16 FIG. 1 is a flowchart illustrating a method 1600 for SRS power control in support of channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure. The operations of the method 1600 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1600 may be implemented by a base station 105 or components thereof as described herein. Figures 10 to 13 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the described functions. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the described functions.

[0216] At 1605, the base station may transmit signaling to the UE indicating switching from the first power control mode to the second power control mode for sounding reference signal transmission. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described with reference to Figures 10 to 13 The described switching is performed by a signaling transmitter.

[0217] At 1610, the base station may receive a report indicating a power headroom associated with the sounding reference signal transmission from the UE and in the second power control mode based on transmitting the signaling indicating the switch. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 10 to 13 The described PHR receiver is implemented.

[0218] At 1615, the base station may estimate the sounding reference signal transmit power based on receiving the report indicating the power headroom. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 10 to 13 The described SRS transmit power estimation component is performed.

[0219] At 1620, the base station may communicate with the UE on a wireless channel based on the estimated sounding reference signal transmit power. The operations of 1620 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1620 may be performed as described with reference to Figures 10 to 13 The described UE communication components are used to perform.

[0220] Fig.17 FIG. 1 is a flowchart illustrating a method 1700 for SRS power control in support of channel estimation for a reconfigurable smart surface link according to various aspects of the present disclosure. The operations of the method 1700 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1700 may be implemented by a UE 115 or a component thereof as described herein. Figures 6 to 9 The communication manager described herein may be used to perform the functions described herein. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0221] At 1705, the UE may receive from the base station a request for one or more reports indicating a transmit power at which the UE transmits a sounding reference signal. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed as described in reference to Figures 6 to 9 The described request receiver is executed.

[0222] At 1710, the UE may transmit the one or more reports to the base station based on receiving the request for the one or more reports. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed as described with reference to Figures 6 to 9 The described reporting transmitter is executed.

[0223] At 1715, the UE may transmit the sounding reference signal to the base station. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed as described with reference to Figures 6 to 9 The SRS transmitter described is performed.

[0224] At 1720, the UE may communicate with the base station on a wireless channel based on the one or more reports and the sounding reference signal. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be performed as described with reference to Figures 6 to 9 The described base station communication components are implemented.

[0225] Fig.18 FIG. 1 is a flowchart illustrating a method 1800 for SRS power control in support of channel estimation for a reconfigurable smart surface link according to aspects of the present disclosure. The operations of the method 1800 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1800 may be implemented by a base station 105 or components thereof as described herein. Figures 10 to 13 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the described functions. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the described functions.

[0226] At 1805, the base station may transmit to the UE a request for one or more reports indicating a transmit power at which the UE transmits a sounding reference signal. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed as described with reference to Figures 10 to 13 The described request transmitter is executed.

[0227] At 1810, the base station may receive the one or more reports from the UE based on transmitting a request for the one or more reports. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed as described with reference to Figures 10 to 13 The described reporting receiver is executed.

[0228] At 1815, the base station may receive the sounding reference signal from the UE. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed as described with reference to Figures 10 to 13 The described SRS receiver is implemented.

[0229] At 1820, the base station may communicate with the UE on a wireless channel based on the one or more reports and the sounding reference signal. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed as described with reference to Figures 10 to 13 The described UE communication components are used to perform.

[0230] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0231] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applied to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0232] The information and signals described herein may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0233] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, 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, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0234] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0235] Computer-readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another place.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or can be used to carry or store instruction or data structure form of desired program code means and can be accessed by general or special-purpose computer or general or special-purpose processor any other non-transient medium.Similarly, any connection is also properly referred to as computer-readable medium.For example, if software is transmitted from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then this coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are just included in the definition of computer-readable medium. Disk and disc as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0236] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of 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). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0237] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

[0238] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or that fall within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than other examples." This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0239] The description herein is provided to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the universal principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present 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. A method for wireless communication at a network node, comprising: transmitting signaling instructing a user equipment (UE) to switch from a first power control mode to a second power control mode for sounding reference signal transmission, wherein the first power control mode comprises a closed-loop power control mode and the second power control mode comprises an open-loop power control mode; receiving, in the second power control mode, via a configurable reflecting surface, a report indicating a power headroom associated with the sounding reference signal transmission based at least in part on transmitting the signaling indicating the switching; estimating a sounding reference signal transmit power based at least in part on receiving the report indicating the power headroom; determining a value of a first channel condition parameter associated with a second UE based at least in part on an estimated sounding reference signal transmit power associated with the report indicating the power headroom and a value of a second channel condition parameter associated with the second UE, wherein the first channel condition parameter and the second channel condition parameter are each associated with a same channel condition between the configurable reflecting surface and the network node; as well as communicating with the UE over a wireless channel based at least in part on the value of the first channel condition parameter, wherein the method further comprises: and determining a value of a scaling factor associated with a channel condition between the UE and the configurable reflecting surface based at least in part on an estimated sounding reference signal transmit power associated with the report indicating the power headroom, wherein determining the value of the first channel condition parameter comprises combining the value of the scaling factor and the value of the second channel condition parameter.

2. The method of claim 1, further comprising: A sounding reference signal associated with the report indicating the power headroom is received in the second power control mode, wherein determining the value of the scaling factor is based at least in part on receiving the sounding reference signal.

3. The method of claim 1 , wherein transmitting the signaling indicating the switching comprises: The signaling indicating the switching is transmitted to the UE via reflection or refraction through the configurable reflective surface.

4. The method of claim 1, wherein the signaling comprises downlink control information indicating the handover, a media access control (MAC) control element indicating the handover, or radio resource control signaling indicating the handover.

5. A method for wireless communication at a network node, comprising: transmitting a request for one or more reports indicating a transmit power at which a user equipment (UE) transmits a sounding reference signal; receiving the one or more reports based at least in part on transmitting the request for the one or more reports; receiving the sounding reference signal via a configurable reflective surface; determining a value of a first channel condition parameter associated with a second UE based at least in part on the one or more reports and a value of a second channel condition parameter associated with the UE, wherein the first channel condition parameter and the second channel condition parameter are each associated with a same channel condition between the configurable reflective surface and the network node; as well as communicating with the UE on a wireless channel based at least in part on the value of the first channel condition parameter and the sounding reference signal, wherein the method further comprises: Determine a value of a scaling factor associated with a channel condition between the UE and the configurable reflective surface based at least in part on the one or more reports, wherein determining the value of the first channel condition parameter comprises combining the value of the scaling factor and the value of the second channel condition parameter.

6. The method of claim 5, wherein transmitting the request comprises: The request is transmitted to the UE via the configurable reflective surface.

7. The method of claim 5, wherein receiving the one or more reports comprises: The one or more reports are received from the UE via the configurable reflective surface.

8. The method of claim 5, wherein: The downlink control information includes the request, the medium access control (MAC) control element includes the request, or the radio resource control signaling includes the request.

9. The method of claim 5, wherein receiving the one or more reports comprises: Uplink control information including the one or more reports is received.

10. An apparatus for wireless communication at a network node, comprising: processor; a memory in electronic communication with the processor, and Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: transmitting signaling instructing a user equipment (UE) to switch from a first power control mode to a second power control mode for sounding reference signal transmission, wherein the first power control mode comprises a closed-loop power control mode and the second power control mode comprises an open-loop power control mode; receiving, in the second power control mode, via a configurable reflecting surface, a report indicating a power headroom associated with the sounding reference signal transmission based at least in part on transmitting the signaling indicating the switching; estimating a sounding reference signal transmit power based at least in part on receiving the report indicating the power headroom; determining a value of a first channel condition parameter associated with a second UE based at least in part on an estimated sounding reference signal transmit power associated with the report indicating the power headroom and a value of a second channel condition parameter associated with the UE, wherein the first channel condition parameter and the second channel condition parameter are each associated with a same channel condition between the configurable reflecting surface and the network node; and communicating with the UE over a wireless channel based at least in part on the value of the first channel condition parameter, wherein the instructions are further executable by the processor to cause the apparatus to: and determining a value of a scaling factor associated with a channel condition between the UE and the configurable reflecting surface based at least in part on an estimated sounding reference signal transmit power associated with the report indicating the power headroom, wherein determining the value of the first channel condition parameter comprises combining the value of the scaling factor and the value of the second channel condition parameter.

11. The apparatus of claim 10, wherein the instructions are further executable by the processor to cause the apparatus to: A sounding reference signal associated with the report indicating the power headroom is received in the second power control mode, wherein determining the value of the scaling factor is based at least in part on receiving the sounding reference signal.

12. The apparatus of claim 10, wherein the instructions for transmitting the signaling indicating the switching are further executable by the processor to cause the apparatus to: The signaling indicating the switching is transmitted to the UE via reflection or refraction through the configurable reflective surface.

13. The apparatus of claim 10, wherein the signaling comprises downlink control information indicating the handover, a media access control (MAC) control element indicating the handover, or radio resource control signaling indicating the handover.

14. An apparatus for wireless communication at a network node, comprising: processor; a memory in electronic communication with the processor, and Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: transmitting a request for one or more reports indicating a transmit power at which a user equipment (UE) transmits a sounding reference signal; receiving the one or more reports based at least in part on transmitting the request for the one or more reports; receiving the sounding reference signal via a configurable reflective surface; determining a value of a first channel condition parameter associated with a second UE based at least in part on the one or more reports and a value of a second channel condition parameter associated with the UE, wherein the first channel condition parameter and the second channel condition parameter are each associated with a same channel condition between the configurable reflective surface and the network node; as well as communicating with the UE on a wireless channel based at least in part on the value of the first channel condition parameter and the sounding reference signal, wherein the instructions are further executable by the processor to cause the apparatus to: Determine a value of a scaling factor associated with a channel condition between the UE and the configurable reflective surface based at least in part on the one or more reports, wherein determining the value of the first channel condition parameter comprises combining the value of the scaling factor and the value of the second channel condition parameter.

15. The apparatus of claim 14, wherein the instructions for transmitting the request are further executable by the processor to cause the apparatus to: The request is transmitted to the UE via the configurable reflective surface.

16. The apparatus of claim 14, wherein the instructions for receiving the one or more reports are further executable by the processor to cause the apparatus to: The one or more reports are received from the UE via the configurable reflective surface.

17. The apparatus of claim 14, wherein: The downlink control information includes the request, the medium access control (MAC) control element includes the request, or the radio resource control signaling includes the request.

18. The apparatus of claim 14, wherein the instructions for receiving the one or more reports are further executable by the processor to cause the apparatus to: Uplink control information including the one or more reports is received.

Images