Analog channel state information reliability detection
By generating parity symbols for analog CSI feedback based on channel coefficients and applying DFT, the reliability of analog CSI detection is improved, enhancing spectral efficiency and data rates in wireless communications.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- QUALCOMM INC
- Filing Date
- 2024-10-18
- Publication Date
- 2026-04-23
AI Technical Summary
Analog channel state information (CSI) feedback in wireless communications systems lacks reliable detection mechanisms, leading to poor channel reporting, inefficient resource allocation, and decreased user experience due to varying transmission power and lack of error detection in analog CSI feedback.
Incorporating parity symbols based on channel coefficients to indicate transmission power and noise level, enabling discrete Fourier transform (DFT) for improved reliability detection of analog CSI feedback.
Enhances the reliability of analog CSI feedback detection, improving spectral efficiency and data rates by accurately determining signal-to-noise ratio (SNR) and phase for each channel tap.
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Figure CN2024125710_23042026_PF_FP_ABST
Abstract
Description
ANALOG CHANNEL STATE INFORMATION RELIABILITY DETECTION
[0001] FIELD OF TECHNOLOGY
[0002] The following relates to wireless communications, including analog channel state information reliability detection.BACKGROUND
[0003] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) .SUMMARY
[0004] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.
[0005] A method for wireless communications by a user equipment (UE) is described. The method may include receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information (CSI) symbols, generating the one or more analog CSI symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with CSI reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling, and transmitting an analog CSI report based on the one or more analog CSI symbols and the one or more parity symbols.
[0006] A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the UE to receive control signaling indicating a position of one or more parity symbols with reference to one or more analog CSI symbols, generate the one or more analog CSI symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with CSI reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling, and transmit an analog CSI report based on the one or more analog CSI symbols and the one or more parity symbols.
[0007] Another UE for wireless communications is described. The UE may include means for receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog CSI symbols, means for generating the one or more analog CSI symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with CSI reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling, and means for transmitting an analog CSI report based on the one or more analog CSI symbols and the one or more parity symbols.
[0008] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive control signaling indicating a position of one or more parity symbols with reference to one or more analog CSI symbols, generate the one or more analog CSI symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with CSI reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling, and transmit an analog CSI report based on the one or more analog CSI symbols and the one or more parity symbols.
[0009] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for generating a set of multiple parity symbols including the one or more parity symbols for the set of multiple taps on a per-tap basis, one set of parity symbols corresponding to each respective tap of the set of multiple taps, ordering a set analog CSI symbols of a set of multiple analog CSI symbols and a set of parity symbols for each respective tap of the set of multiple taps in accordance with the control signaling, and performing a discrete Fourier transform (DFT) procedure on the set of multiple parity symbols and the set of multiple analog CSI symbols in accordance with the ordering, where transmitting the analog CSI report may be based on performing the DFT procedure.
[0010] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, generating the one or more parity symbols may include operations, features, means, or instructions for generating a parity symbol based on an average power of the one or more analog CSI symbols associated with the first tap, the one or more parity symbols including a positive real number.
[0011] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the one or more parity symbols indicates a phase of the one or more analog CSI symbols associated with the first tap, the one or more parity symbols including a complex value.
[0012] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for prepending the one or more parity symbols before the one or more analog CSI symbols in time in accordance with the control signaling and performing a DFT procedure on the one or more parity symbols and the one or more analog CSI symbols, where transmitting the analog CSI report may be based on performing the DFT procedure.
[0013] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for appending the one or more parity symbols after the one or more analog CSI symbols in time in accordance with the control signaling and performing a DFT procedure on the one or more parity symbols and the one or more analog CSI symbols, where transmitting the analog CSI report may be based on performing the DFT procedure.
[0014] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for generating an additional one or more analog CSI symbols and an additional one or more parity symbols corresponding to a second tap of the set of multiple taps, appending the one or more parity symbols and the additional one or more parity symbols after the one or more analog CSI symbols and the additional one or more analog CSI symbols, and performing a DFT procedure on the one or more parity symbols, the additional one or more parity symbols, the one or more analog CSI symbols, and the additional one or more analog CSI symbols, where transmitting the analog CSI report may be based on performing the DFT procedure.
[0015] A method for wireless communications by a UE is described. The method may include receiving control signaling indicating parity symbol information associated with an analog CSI report, generating one or more analog CSI symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with CSI reporting, where the one or more parity symbols correspond to one or more null tones, and transmitting the analog CSI report based on the one or more analog CSI symbols and the one or more parity symbols in accordance with the control signaling.
[0016] A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the UE to receive control signaling indicating parity symbol information associated with an analog CSI report, generate one or more analog CSI symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with CSI reporting, where the one or more parity symbols correspond to one or more null tones, and transmit the analog CSI report based on the one or more analog CSI symbols and the one or more parity symbols in accordance with the control signaling.
[0017] Another UE for wireless communications is described. The UE may include means for receiving control signaling indicating parity symbol information associated with an analog CSI report, means for generating one or more analog CSI symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with CSI reporting, where the one or more parity symbols correspond to one or more null tones, and means for transmitting the analog CSI report based on the one or more analog CSI symbols and the one or more parity symbols in accordance with the control signaling.
[0018] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive control signaling indicating parity symbol information associated with an analog CSI report, generate one or more analog CSI symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with CSI reporting, where the one or more parity symbols correspond to one or more null tones, and transmit the analog CSI report based on the one or more analog CSI symbols and the one or more parity symbols in accordance with the control signaling.
[0019] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, via the parity symbol information, an indication of a position of the one or more parity symbols with reference to the one or more analog CSI symbols and ordering the one or more parity symbols and the one or more analog CSI symbols in accordance with the indication of the position.
[0020] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, ordering the one or more parity symbols and the one or more analog CSI symbols may include operations, features, means, or instructions for prepending the one or more parity symbols before the one or more analog CSI symbols in time, appending the one or more parity symbols after the one or more analog CSI symbols in time, interleaving the one or more parity symbols in time with the one or more analog CSI symbols, or any combination thereof based on the control signaling.
[0021] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for performing a DFT procedure one or more parity symbols and the one or more analog CSI symbols and generating a set of multiple zero power subcarriers corresponding to the one or more parity symbols and the one or more null tones based on the DFT procedure.
[0022] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, a quantity of parity symbols to be generated based on a quantity of non-zero channel coefficients and a quantity of samples corresponding to the DFT procedure.
[0023] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, via the parity symbol information, an indication of a quantity of the one or more parity symbols to be generated, a quantity of the one or more null tones, or both.
[0024] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the one or more null tones indicate a noise level of the one or more analog CSI symbols.
[0025] Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.BRIEF DESCRIPTION OF THE DRAWINGS
[0026] FIG. 1 shows an example of a wireless communications system that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.
[0027] FIG. 2 shows an example of a wireless communications system that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.
[0028] FIG. 3 shows an example of an analog channel feedback scheme that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.
[0029] FIG. 4 shows an example of an analog channel feedback scheme that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.
[0030] FIG. 5 shows an example of a transmission chain that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.
[0031] FIG. 6 shows an example of a process flow that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.
[0032] FIGs. 7 and 8 show block diagrams of devices that support analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.
[0033] FIG. 9 shows a block diagram of a communications manager that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.
[0034] FIG. 10 shows a diagram of a system including a device that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.
[0035] FIGs. 11 through 15 show flowcharts illustrating methods that support analog channel state information reliability detection in accordance with one or more aspects of the present disclosure.DETAILED DESCRIPTION
[0036] In some wireless communications systems, to support effective wireless signaling, a user equipment (UE) may transmit channel state information (CSI) feedback signaling (e.g., CSI reports) to indicate channel information (e.g., one or more channel coefficients of a downlink channel) . Such information may be used by the network to efficiently allocate resources and improve the quality and reliability of wireless signaling. In some time division duplexing (TDD) communications systems, the resolution (e.g., granularity or detail) of the CSI feedback may be relatively high. To enable CSI feedback messages with similar resolution in frequency division duplexing (FDD) communications systems, the UE may utilize analog or digital CSI feedback signaling schemes. In some cases, digital feedback schemes may utilize a relatively large quantity of quantization bits to achieve the high resolution (e.g., granularity) , which may lead to increased signaling overhead. In such cases, analog feedback schemes (e.g., continuous-amplitude signaling or unquantized signaling) may support improved performance in FDD systems compared to digital feedback (e.g., may support high resolution CSI feedback without the signaling overhead cost associated with digital feedback schemes) . For instance, analog feedback schemes may outperform (e.g., be more efficient and support high resolution) than digital reporting schemes in high signal to interference and noise ratio (SINR) regions.
[0037] In some cases, a transmission power of each channel coefficient indicated by the analog CSI feedback may vary. Additionally, or alternatively, the analog CSI feedback may be communicated without a method for error detection and correction (e.g., a cyclic redundancy check (CRC) ) . In such cases, a receiving entity (e.g., a network entity) may not have a mechanism with which to reliably determine the channel coefficients indicated by the analog CSI feedback (e.g., because a transmit power may be different for each channel coefficient) . Additionally, or alternatively, the analog CSI feedback may be transmitted without channel coding.
[0038] In some cases, the analog CSI feedback may be associated with one or more channel taps (e.g., active taps) of an uplink channel, where each tap is associated with a respective channel delay. A signal to noise ratio (SNR) of the channel coefficients may vary across the taps. In some cases, demodulation reference signals (DMRSs) may be provided for estimation of uplink SINR and to deduce a reliability of analog channel feedback by the receiving entity. However, the DMRS may be time-domain multiplexed (TDM) on a per-symbol level. In such cases, the resulting uplink SNR determined by the receiving entity may be an average SNR across the taps, which may decrease the reliability of the channel coefficient information indicated by the received analog CSI feedback. Thus, although analog CSI feedback may support higher resolution feedback, reliability of channel coefficients may not be determinable by the network entity. In such examples, the quality of the CSI feedback may be degraded, resulting in poor channel reporting, inefficient allocation of resources, poor throughput or decreased reliability of wireless signaling, and decreased user experience.
[0039] Techniques described herein may support increased reliability detection of received analogy channel feedback. Such techniques may enable the UE to indicate transmission power of the analog CSI symbols per each active tap. For example, described techniques may support the insertion of parity symbols for per-tap SNR measurements to assist the network entity in determining analog CSI reliability. In some implementations, the UE may generate and include one or more parity symbols (e.g., power indicator parity symbols) with the analog CSI feedback. In some examples, at least one parity symbol may be included for each tap of the one or more taps. The parity symbols may be based on the values of the analog CSI symbols associated with a respective tap. In such examples, each parity symbol may indicate one or more properties of the analog CSI associated with a respective associated tap. That is, the parity symbols may convey an average power, a phase, or both, of channel coefficients indicated by analog CSI (e.g., on a per-tap level) .
[0040] In some implementations, the UE may generate and include one or more parity symbols to be used for noise estimation by the receiving entity (e.g., noise estimation parity symbols) . Each noise estimation parity symbol may be based on the values of the analog CSI symbols associated with a respective tap. In some examples, the UE may apply a discrete Fourier transform (DFT) (e.g., a time-domain to frequency-domain transform) to each of the taps (e.g., each analog CSI symbol and each noise estimation parity symbol) . In such examples, the symbols resulting from transforming the noise estimation parity symbols may correspond to zero power symbols (e.g., zero power subcarriers) . In such examples, the resulting zero power subcarriers may be used to determine a noise or interference power associated with the channel coefficients. The receiving entity may indicate a time-domain position of the noise estimation parity symbols with respect to the analog CSI symbols to the UE.
[0041] The network entity may receive the CSI report, and based on the parity symbols (e.g., power indicator, noise estimation parity symbols, or both) , the network entity may detect a power of the analog CSI coefficients, and SNR, a phase, or any combination thereof, for the received CSI report.
[0042] Particular aspects of the subject matter described herein may be implemented to realize enhanced reliability of analog CSI feedback detection. For example, determining the SNR value for each active tap may enable a receiving entity to more reliably receive and decode analog CSI symbols, which may support improvements to improved spectral efficiency and increased data rates, among other benefits
[0043] Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further described in the context of signaling diagrams, system architectures, and process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to analog channel state information reliability detection.
[0044] FIG. 1 shows an example of a wireless communications system 100 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The wireless communications system 100 may include one or more devices, such as one or more network devices (e.g., network entities 105) , one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.
[0045] The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via communication link (s) 125 (e.g., a radio frequency (RF) access link) . For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish the communication link (s) 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and a UE 115 may support the communication of signals according to one or more radio access technologies (RATs) .
[0046] The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices in the wireless communications system 100 (e.g., other wireless communication devices, including UEs 115 or network entities 105) , as shown in FIG. 1.
[0047] As described herein, a node of the wireless communications system 100, which may be referred to as a network node, or a wireless node, may be a network entity 105 (e.g., any network entity described herein) , a UE 115 (e.g., any UE described herein) , a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first, second, and third nodes may be different relative to these examples. Similarly, reference to a UE 115, network entity 105, apparatus, device, computing system, or the like may include disclosure of the UE 115, network entity 105, apparatus, device, computing system, or the like being a node. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.
[0048] In some examples, network entities 105 may communicate with a core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via backhaul communication link (s) 120 (e.g., in accordance with an S1, N2, N3, or other interface protocol) . In some examples, network entities 105 may communicate with one another via backhaul communication link (s) 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via the core network 130) . In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol) , or any combination thereof. The backhaul communication link (s) 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link) or one or more wireless links (e.g., a radio link, a wireless optical link) , among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.
[0049] One or more of the network entities 105 or network equipment described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a 5G NB, a next-generation eNB (ng-eNB) , a Home NodeB, a Home eNodeB, or other suitable terminology) . In some examples, a network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within one network entity (e.g., a network entity 105 or a single RAN node, such as a base station 140) .
[0050] In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) , which may be configured to utilize a protocol stack that is physically or logically distributed among multiple network entities (e.g., network entities 105) , such as an integrated access and backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 105 may include one or more of a central unit (CU) , such as a CU 160, a distributed unit (DU) , such as a DU 165, a radio unit (RU) , such as an RU 170, a RAN Intelligent Controller (RIC) , such as an RIC 175 (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, such as an SMO system 180, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 105 may be located in distributed locations (e.g., separate physical locations) . In some examples, one or more of the network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0051] The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, or any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3) , layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaptation protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU 160 (e.g., one or more CUs) may be connected to a DU 165 (e.g., one or more DUs) or an RU 170 (e.g., one or more RUs) , or some combination thereof, and the DUs 165, RUs 170, or both may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or multiple different RUs, such as an RU 170) . In some cases, a functional split between a CU 160 and a DU 165 or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170) . A CU 160 may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to a DU 165 via a midhaul communication link 162 (e.g., F1, F1-c, F1-u) , and a DU 165 may be connected to an RU 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface) . In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities (e.g., one or more of the network entities 105) that are in communication via such communication links.
[0052] In some wireless communications systems (e.g., the wireless communications system 100) , infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130) . In some cases, in an IAB network, one or more of the network entities 105 (e.g., network entities 105 or IAB node (s) 104) may be partially controlled by each other. The IAB node (s) 104 may be referred to as a donor entity or an IAB donor. A DU 165 or an RU 170 may be partially controlled by a CU 160 associated with a network entity 105 or base station 140 (such as a donor network entity or a donor base station) . The one or more donor entities (e.g., IAB donors) may be in communication with one or more additional devices (e.g., IAB node (s) 104) via supported access and backhaul links (e.g., backhaul communication link (s) 120) . IAB node (s) 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by one or more DUs (e.g., DUs 165) of a coupled IAB donor. An IAB-MT may be equipped with an independent set of antennas for relay of communications with UEs 115 or may share the same antennas (e.g., of an RU 170) of IAB node (s) 104 used for access via the DU 165 of the IAB node (s) 104 (e.g., referred to as virtual IAB-MT (vIAB-MT) ) . In some examples, the IAB node (s) 104 may include one or more DUs (e.g., DUs 165) that support communication links with additional entities (e.g., IAB node (s) 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream) . In such cases, one or more components of the disaggregated RAN architecture (e.g., the IAB node (s) 104 or components of the IAB node (s) 104) may be configured to operate according to the techniques described herein.
[0053] In the case of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support analog channel state information reliability detection as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., components such as an IAB node, a DU 165, a CU 160, an RU 170, an RIC 175, an SMO system 180) .
[0054] A 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 terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A 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, a 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 communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, vehicles, or meters, among other examples.
[0055] The UEs 115 described herein may be able to communicate with various types of devices, such as UEs 115 that may sometimes operate as relays, as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
[0056] The UEs 115 and the network entities 105 may wirelessly communicate with one another via the communication link (s) 125 (e.g., one or more access links) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined PHY layer structure for supporting the communication link (s) 125. For example, a carrier used for the communication link (s) 125 may include a portion of an RF spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more PHY layer channels for a given RAT (e.g., LTE, LTE-A, LTE-A Pro, NR) . Each PHY layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting, ” “receiving, ” or “communicating, ” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities, such as one or more of the network entities 105) .
[0057] In some examples, such as in a carrier aggregation configuration, a carrier may have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute RF channel number (EARFCN) ) and may be identified according to a channel raster for discovery by the UEs 115. A carrier may be operated in a standalone mode, in which case initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode, in which case a connection is anchored using a different carrier (e.g., of the same or a different RAT) .
[0058] The communication link (s) 125 of the wireless communications system 100 may include downlink transmissions (e.g., forward link transmissions) from a network entity 105 to a UE 115, uplink transmissions (e.g., return link transmissions) from a UE 115 to a network entity 105, or both, among other configurations of transmissions. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
[0059] A carrier may be associated with a particular bandwidth of the RF spectrum and, in some examples, the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a set of bandwidths for carriers of a particular RAT (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) . Devices of the wireless communications system 100 (e.g., the network entities 105, the UEs 115, or both) may have hardware configurations that support communications using a particular carrier bandwidth or may be configurable to support communications using one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include network entities 105 or UEs 115 that support concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating using portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.
[0060] Signal waveforms transmitted via a carrier may be made up of 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 employing MCM techniques, a resource element may refer to resources of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The quantity of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) , such that a relatively higher quantity of resource elements (e.g., in a transmission duration) and a relatively higher order of a modulation scheme may correspond to a relatively higher rate of communication. A wireless communications resource may refer to a combination of an RF spectrum resource, a time resource, and a spatial resource (e.g., a spatial layer, a beam) , and the use of multiple spatial resources may increase the data rate or data integrity for communications with a UE 115.
[0061] One or more numerologies for a carrier may be supported, and a numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time and communications for the UE 115 may be restricted to one or more active BWPs.
[0062] The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of Ts=1 / (Δfmax·Nf) seconds, for which Δfmax may represent a supported subcarrier spacing, and Nf may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource 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) .
[0063] Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems, such as the wireless communications system 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., Nf) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
[0064] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
[0065] Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple 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 an amount of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to UEs 115 (e.g., one or more UEs) or may include UE-specific search space sets for sending control information to a UE 115 (e.g., a specific UE) .
[0066] In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area, such as the coverage area 110. In some examples, coverage areas 110 (e.g., different coverage areas) associated with different technologies may overlap, but the coverage areas 110 (e.g., different coverage areas) may be supported by the same network entity (e.g., a network entity 105) . In some other examples, overlapping coverage areas, such as a coverage area 110, associated with different technologies may be supported by different network entities (e.g., the network entities 105) . The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 support communications for coverage areas 110 (e.g., different coverage areas) using the same or different RATs.
[0067] The wireless communications system 100 may support synchronous or asynchronous operation. For synchronous operation, network entities 105 (e.g., base stations 140) may have similar frame timings, and transmissions from different network entities (e.g., different ones of the network entities 105) may be approximately aligned in time. For asynchronous operation, network entities 105 may have different frame timings, and transmissions from different network entities (e.g., different ones of network entities 105) may, in some examples, not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operations.
[0068] The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) . The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.
[0069] In some examples, a UE 115 may be configured to support communicating directly with other UEs (e.g., one or more of the UEs 115) via a device-to-device (D2D) communication link, such as a D2D communication link 135 (e.g., in accordance with a peer-to-peer (P2P) , D2D, or sidelink protocol) . In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170) , which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to-many (1: M) system in which each UE 115 transmits to one or more of the UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.
[0070] 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 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
[0071] The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than one hundred kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
[0072] The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) RAT, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA) . Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
[0073] A network entity 105 (e.g., a base station 140, an RU 170) or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a network entity 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may 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, antennas or antenna arrays associated with a network entity 105 may be located at diverse geographic locations. A network entity 105 may include an antenna array with a set of rows and columns of antenna ports that the network entity 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally, or alternatively, an antenna panel may support RF beamforming for a signal transmitted via an antenna port.
[0074] The network entities 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) . Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) , for which multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , for which multiple spatial layers are transmitted to multiple devices.
[0075] 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 network entity 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 the signals communicated via antenna elements of an antenna array such that some signals propagating along particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
[0076] A network entity 105 or a UE 115 may use beam sweeping techniques as part of beamforming operations. For example, a network entity 105 (e.g., a base station 140, an RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a network entity 105 multiple times along different directions. For example, the network entity 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission. Transmissions along different beam directions may be used to identify (e.g., by a transmitting device, such as a network entity 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the network entity 105.
[0077] Some signals, such as data signals associated with a particular receiving device, may be transmitted by a transmitting device (e.g., a network entity 105 or a UE 115) along a single beam direction (e.g., a direction associated with the receiving device, such as another network entity 105 or UE 115) . In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted along one or more beam directions. For example, a UE 115 may receive one or more of the signals transmitted by the network entity 105 along different directions and may report to the network entity 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.
[0078] In some examples, transmissions by a device (e.g., by a network entity 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from a network entity 105 to a UE 115) . The UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across a system bandwidth or one or more sub-bands. The network entity 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS) ) , which may be precoded or unprecoded. 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 along one or more directions by a network entity 105 (e.g., a base station 140, an RU 170) , a UE 115 may employ similar techniques for transmitting signals multiple times along different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal along a single direction (e.g., for transmitting data to a receiving device) .
[0079] A receiving device (e.g., a UE 115) may perform reception operations in accordance with multiple receive configurations (e.g., directional listening) when receiving various signals from a transmitting device (e.g., a network entity 105) , such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may perform reception in accordance with multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by 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 by 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 receive configurations or receive directions. In some examples, a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) . The single receive configuration may be aligned along a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .
[0080] The UEs 115 and the network entities 105 may support retransmissions of data to increase the likelihood that data is received successfully. Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly via a communication link (e.g., the communication link (s) 125, a D2D communication link 135) . HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) . HARQ may improve throughput at the MAC layer in relatively poor radio conditions (e.g., low signal-to-noise conditions) . In some examples, a device may support same-slot HARQ feedback, in which case the device may provide HARQ feedback in a specific slot for data received via a previous symbol in the slot. In some other examples, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
[0081] A UE 115 may transmit one or more analog CSI feedback messages (e.g., rather than digital, quantized CSI feedback) . The analog CSI feedback messages may indicate, to a network entity 105, one or more channel coefficients associated with a downlink channel for wireless communications. In some cases, the analog CSI symbols may be associated with multiple channel taps (e.g., active taps) with each tap corresponding to a channel delay value. For example, a first set of analog CSI symbols may be associated with a first tap (e.g., a first channel delay) , and a second set of analog CSI symbols that are different from the first set of analog CSI messages may be associated with a second tap (e.g., a second channel delay) .
[0082] Techniques initially described herein support methods for enhancing analog channel state information detection reliability. In some implementations, the UE 115 may include one or more parity symbols with the analog CSI symbols. In some examples, the UE 115 may include at least one parity symbol for each active tap associated with the analog CSI symbols. A position of the parity symbol with respect to the analog CSI symbols for each tap may be indicated to the UE 115 by the network entity 105. In some examples, the parity symbol may be included before (e.g., prepended before) or included after (e.g., appended after) the analog CSI symbols associated with the tap. Additionally, or alternatively, the UE 115 may include multiple parity symbols after each analog CSI symbol corresponding to multiple active taps. The parity symbols may indicate an average power of the analog CSI symbols for each tap of the active taps.
[0083] In some implementations, the UE 115 may include one or more noise estimation parity symbols (e.g., additional parity symbols) . A position of the noise estimation parity symbols with respect to the analog CSI symbols may be indicated to the UE 115 by the network entity 105. In some examples, the noise estimation may be included before (e.g., prepended before) or included after (e.g., appended after) the analog CSI symbols. In some examples, the UE 115 may perform a discrete Fourier transform (DFT) on the analog CSI symbols and the noise estimation parity symbols. In such examples, performing the DFT on the parity symbols may produce zero power symbols (e.g., zero power subcarriers, or null tones) . The resulting zero power symbols may indicate a noise or interference power level associated with the channel coefficients indicated by the analog CSI symbols.
[0084] In some implementations, the UE 115 may transmit a feedback report including the analog CSI symbols and the parity symbols. In such implementations, the network entity 105 may determine a signal to noise ratio (SNR) associated with the channel coefficients indicated by the analog CSI symbols. The SNR may be determined based on the indicated power level associated with each tap of the active taps indicated by the parity symbols and the noise power indicated by the noise estimation parity symbols.
[0085] FIG. 2 shows an example of a wireless communications system 200 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. In some examples, the wireless communications system 200 may implement or be implemented by aspects of the wireless communications system 100. For example, the wireless communications system 200 may include a UE 115-a and a network entity 105-a, which may be examples of the UE 115 and the network entity 105 respectively. The UE 115-a and the network entity 105-a may support analog channel state information reliability detection.
[0086] In some cases, the UE 115-a and the network entity 105-a may communicate via a downlink 205 and an uplink 210. In some cases, the UE 115-a may communicate analog CSI symbols to indicate one or more channel coefficients corresponding to one or more downlink channels. the UE 115-a may transmit the analog CSI feedback messages based on receiving one or more CSI reference signals (CSI-RSs) 215 from the network entity 105-a and performing one or more measurements on the CSI-RSs 215.
[0087] In some examples (e.g., as a result of TDD reciprocity) , the network entity 105-a may support high resolution CSI. Such high resolution CSI may support multi-user (MU) and single-user (SU) deployment (e.g., in cases of high rank, such as in MIMO deployments) . Some feedback schemes (e.g., some codebook based CSI feedback schemes, such as Type II CSI or other feedback schemes) may not support high resolution CSI in FDD deployments. This may be the case due to limited time-domain resolution resulting from subband granularity, using a same amplitude or phase quantization bits for all non-zero coefficients, insufficient information for MU operations, or the like.
[0088] In some examples, explicit channel feedback (e.g., digital or analog) may provide an alternative approach to achieve SRS in FDD bands or where SRS is less feasible (e.g., CSI feedback from higher bands in lower bands) . In such examples, the UE 115-a may report downlink channel estimates including eigenvalues and eigenvectors using a digital or an analogy approach. Such approaches may include, for a time domain channel, tap pruning and selection, and non-zero channel coefficient reporting.
[0089] The analog CSI symbols may be associated with one or more channel taps (e.g., active taps) , where each tap is associated with a respective channel delay for the downlink channel. In some cases, the analog CSI feedback may result in lower processing and signaling overhead compared to digital feedback schemes, which may utilize a relatively large quantity of quantization bits and have a correspondingly high overhead to achieve a relatively high resolution (e.g., detail or granularity) . For example, assuming M channel coefficients for active taps to be sent to the network entity 105-a, the UE 115-a may spread the M coefficients using a DFT (e.g., an N-point DFT transform, with zero-padding if M<N) , and may map the resulting transform to N resource elements (REs) , where M indicates a quantity of channel coefficients being reported by the UE 115-a and N indicates a quantity of samples used in performing the DFT (e.g., N-point DFT) . In other words, the time domain discrete set of coefficients is converted to a frequency domain signal for transmission. At the receiver (e.g., the network entity 105-a) , an inverse DFT (IDFT) procedure is performed to convert the signal back to the time domain. Per-tap Minimum Mean Squared Error (MMSE) is applied to estimate channel coefficients from the observation because each coefficient could have a different magnitude or correspond to a different transmit power, and thus correspond to a different SNR.
[0090] In some examples, analog feedback may outperform digital reporting for explicit channel feedback (e.g., in high SINR regions) . However, the analog CSI feedback may be communicated without a method for error detection and correction (e.g., a cyclic redundancy check (CRC) ) . In such cases, a receiving entity such as the network entity 105-a may be unable to reliably determine the channel coefficients indicated by the analog CSI feedback.
[0091] In some cases, a SNR of the channel coefficients may vary across the taps. DMRSs and analog CSI may be multiplexed (e.g., via TDM at an OFDM symbol level) such that uplink SINRmay be measured by the network entity 105-a. That is, the network entity 105-a may use DMRSs to estimate the uplink SINR and deduce the reliability of the analog channel feedback. However, because measured uplink SINR based on the DMRSs (e.g., due to the TDM) may represent an average SINR of the overall signal, and cannot be relied upon to accurately represent the SNR of each analog channel coefficient, which can vary significantly across different taps.
[0092] In accordance with examples described herein, the UE 115-a and the network entity 105-a may support reliability detection of received analog channel feedback based on inserted parity symbols for per-tap SNR measurements, which may assist the network entity 105-a in determining analog CSI reliability. The UE 115-a may include (e.g., insert) one or more parity symbols with the analog CSI symbols. In some implementations, the UE 115-a may include at least one parity symbol for each set of analog CSI symbols associated with a tap. For instance, the UE 115-a may include at least one parity symbol for each channel tap associated with the uplink 210. In some examples, the parity symbols may enable a receiving entity such as the network entity 105-a to determine a per-tap SNR measurement for the analog CSI symbols.
[0093] In some examples, the parity symbols may convey a power level for a given tap (e.g., an average power of an associated tap) , which may be utilized by the network entity 105-a to estimate the per-tap SNR and provide it as an input to a per-tap MMSE receiver. In some examples, the parity symbols may be positive, real-valued values (e.g., real numbers) based on an average power of the corresponding channel coefficients indicated by the analog CSI symbols. In such examples, the parity symbols may indicate an average power of the analog CSI symbols associated with a respective tap (e.g., the tap associated with the parity symbol) . Additionally, or alternatively, the parity symbols may be complex numbers based on the corresponding channel coefficients. In such examples, the parity symbols may indicate an average power of the analog CSI symbols associated with a respective tap (e.g., the tap associated with the parity symbol) and an indication of a phase of the channel coefficients.
[0094] In some implementations, the UE 115-a may generate (e.g., construct) the parity symbols based on one or more properties of the channel coefficients. For example, for K active taps h1, h2, ..., hK with variable average power Pi, the non-zero coefficients reported for i-th active tap may be defined by where xi, j~CN (0, Pi) and is the total quantity of feedback coefficients across all taps. Additionally, or alternatively, Mi may be different for each tap. In some examples, for each active tap, the UE 115-a may insert at least one parity symbol based on the reported channel coefficients of the tap. That is, for i-th tap, UE may transmit Mi+1 analog data symbols where the parity symbol yi is based on the reported Mi analog CSI symbols.
[0095] The UE 115-a may determine a value of each parity symbol yi. In some examples, the parity symbols are positive, real numbers, the UE 115-a may generate the parity symbols based on the reported channel coefficients (e.g., yi is a positive real number with a value based on the mean power of the associated complex coefficients) . For instance, for the channel coefficients the parity symbol yi may be generated based on Equation 1, shown below.
[0096] In such examples, the power level of the resulting parity symbol yi may provide an indication (e.g., may give an estimate) of the average power Pi of the associated tap.
[0097] In some other implementations, the parity symbols are complex-numbers. In such examples, UE 115-a may generate the parity symbols yi based on the reported channel coefficients. In some examples, for the channel coefficients the parity symbol yi may be generated based on Equation 2, shown below.
[0098] In such examples, the sum operation expressed in Equation 2 is a modulo sum operation. That is, the sum is modulo with a positive value Accordingly, the resulting values may lie between - and where Pi may denote the average transmission power of the Mi analog CSI symbols and is given by Equation 3, shown below.
[0099] In such examples, the resulting parity symbol yi may provide an indication (e.g., may give an estimate) of the average power, phase information, or both, for the associated tap.
[0100] In some implementations, the parity symbols may be multiplexed in time (e.g., time-domain multiplexing) with the analog CSI feedback, as illustrated with reference to FIG. 3. In such implementations, the combined analog CSI symbols and parity symbols may be included an analog CSI report 220. The analog CSI report 220 may be based on the analogy CSI symbols and at least one parity symbol for each tap. For example, one or more parity symbols may be appended or prepended or otherwise inserted into each respective set of analog CSI symbols for each respective tap prior to a DFT performed on the CSI symbols and the parity symbols. The analog CSI report 220 may be based on the DFT.
[0101] In some implementations, the network entity 105-a may output control signaling 225 (e.g., RRC signaling, or the like) to the UE 115-a. The control signaling 225 may indicate a position of the parity symbol with respect to the analog CSI symbols of a given tap. For example, the control signaling 225 may indicate an ordering of the analog CSI report 220 in time The control signaling 225 may indicate that the parity symbols should be prepended before the CSI symbols of each tap, appended after the CSI symbols of each tap, or the like. The network entity 105-a may receive and properly decode both the analog CSI symbols and the parity symbol based on providing the control signaling 225. Additionally, or alternatively, the position of the parity symbol may be predefined.
[0102] In some examples, multiple parity symbols corresponding to multiple taps may be included after multiple sets of analog CSI symbols associated with the multiple taps. For example, the UE 115-a sequentially order (e.g., multiplex in time) a first set of analog CSI symbols corresponding to a first tap, followed by a second set of analog CSI symbols corresponding to a second tap, followed by a third set of analog CSI symbols corresponding to a third tap (e.g., as illustrated with reference to FIG. 3) . The UE 115-a may then, after the analog CSI symbols, sequentially include a first parity symbol, a second parity symbol, and a third parity symbol corresponding to the first tap, the second tap, and the third tap respectively.
[0103] In some implementations, the UE 115-a may generate (e.g., insert into the analogy CSI symbols) one or more noise estimation parity symbols (e.g., additional parity symbols) . For example (e.g., as illustrated with reference to FIG. 4) a set of parity symbols for measuring the level of noise contained in the received analogy CSI symbols may be inserted in the reported analog CSI symbols (e.g., in addition to or instead of the parity symbols inserted to convey the average noise for each tap) . The parity symbols for noise estimation may be added so that the DFT transformed signal corresponds to zero in some positions. For example, for M channel coefficients and an N-point DFT, a threshold quantity of N-M parity symbols may be inserted resulting in an N-M zero power subcarriers after DFT. Such zero power subcarriers may denote a null space of a signal, which can be used (e.g., by the network entity 105-a) for noise estimation. If the noise or interference is isotropic, then the noise power estimated on the zero power subcarriers may provide an accurate estimate of noise and interference in the signal space. In such implementations, where M indicates a quantity of channel coefficients being reported by the UE 115-a and N indicates a quantity of samples used in performing the DFT (e.g., N-point DFT) , the quantity of noise estimation parity symbols to be inserted by the UE 115-a may be determined by N-M.
[0104] In some implementations, the UE 115-a may generate (e.g., construct) the noise estimation parity symbols based on one or more properties of the channel coefficients. In some examples, a variable k may be defined to be k=N-M-1, ..., N-1, where k denotes N-M spectrum components after performing the DFT. In such examples, variables and Xk may be defined as given by Equation 4 and Equation 5 respectively, shown below.
[0105] In such examples, xn may represent the analog CSI symbols. Correspondingly, W may be defined such that for k= [N-M-1, N-1] and n= [N-M-1, N-1] , with n being a matrix equal to (N-M) × (N-M) . In such examples, N-M parity symbols, indicated by yi, may be determined as given by Equation 6, shown below. W-1·[XN-M-1, XN-M, ..., XN-1] T / N= [y1, ..., yN-M] T (6)
[0106] In such examples, the UE 115-a may perform the DFT on the resulting symbols, producing the symbols (e.g., symbol vector) [x1, ..., xM, y1, ..., yN-M] T, which includes N-M zero spectrum components (e.g., which may be referred to as null tones) .
[0107] In some implementations, the network entity 105-a may output control signaling 230 (e.g., RRC signaling or other signaling) to the UE 115-a. The control signaling 230 may indicate a position of the noise estimation parity symbols with respect to the analog CSI symbols. For example, the control signaling 230 may indicate an ordering of the analog CSI symbols in time. In some examples, the noise estimation parity symbols may be included (e.g., multiplexed) before the analog CSI symbols in time (e.g., prepended before and occurring in time before the analog CSI symbols) . In some other examples, the noise estimation parity symbols may be included (e.g., multiplexed) after the analog CSI symbols in time (e.g., appended after and occurring in time after the analog CSI symbols) . Additionally, or alternatively, the noise estimation parity symbols may be multiplexed within (e.g., interleaved in time with) the analog CSI symbols.
[0108] In some implementations, the control signaling 230 may further indicate a quantity of noise estimation parity symbols for the UE 115-a to insert (e.g., up to N-Mparity symbols) , where N represents the quantity of subcarriers in one or all of the OFDM symbols, and M represents a quantity of analog CSI symbols in one or all OFDM symbols. A quantity of the null tones (e.g., which may be referred to as nulling tones) may be configured via the control signaling 230 (e.g., the control signaling 230 may indicate a quantity of nulling subcarriers within one OFDM symbols, or a quantity of nulling subcarriers within all OFDM symbols assuming uniform distribution in each OFDM symbol) . Additionally, or alternatively, the position of the noise estimation parity symbols, the quantity of noise estimation parity symbols to insert, or both, may be predefined. In some examples, the network entity 105-a may receive and properly decode the analog CSI report 220 based on outputting the control signaling 230.
[0109] In some implementations, the UE 115-a may transmit the analog CSI report 220 to the network entity 105-a including the analog CSI symbols, the power estimation parity symbols, the noise estimation parity symbols, or both. In some examples, the network entity 105-a may utilize the parity symbols to detect the reliability of the received analog CSI report 220. The network entity 105-a may utilize the parity symbols that convey the average power of the associated tap to further estimate the per-tap SNR and provide such estimates as an input to the per-tap MMSE receiver. In some examples, the network entity 105-a may use the parity symbols for noise estimation to estimate the noise or interference or both contained in the analog CSI symbols, and the estimated noise and interference can be subtracted from or removed from the received analog CSI report. The parity symbols may convey phase information of the associated channel coefficients, which the network entity 105-a may use as an analog verification (e.g., redundancy check) to validate the reliability of the received analog CSI feedback.
[0110] FIG. 3 shows an example of an analog channel feedback scheme 300 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. In some examples, the analog channel feedback scheme 300 may represent aspects of the wireless communications system 100 and the wireless communications system 200.
[0111] In some implementations, the analog channel feedback scheme 300 may include at least a first set of analog CSI symbols 305 associated with a first tap 310. Additionally, or alternatively, the analog channel feedback scheme 300 may include a second set of analog CSI symbols 315 and a third set of analog CSI symbols 325, which are associated with a second tap 320 and a third tap 330 respectively. In some examples, the analog channel feedback scheme 300 may include a set of parity symbols 335, including at least one parity symbol for each channel tap of the active taps. For example, a transmitting device (e.g., a UE 115) may insert at least one parity symbol of the set of parity symbols 335 into each of the first tap 310, the second tap 320, and the third tap 330. In such examples, the parity symbol 335-a may be inserted into the first tap 310, the parity symbol 335-b may be inserted into the second tap 320, and the parity symbol 335-c may be inserted into the third tap 330. The parity symbols 335 may convey an average power of each associated tap, which the network entity may use to estimate a per-tap SNR, which can be provide as an input to the per-tap MMSE receiver. The parity symbols 335 may be inserted for each tap prior to a DFT procedure.
[0112] The analog channel feedback scheme 300 may indicate one candidate ordering of the analog CSI symbols and the set of parity symbols 335. In such an example, each parity symbol of the set of parity symbols 335 may be included (e.g., multiplexed in time) after a set of analog CSI symbols associated with the channel tap (e.g., appended after the analog CSI symbols of a given tap) . For example, the at least one parity symbol 335-a may be multiplexed in time after the first set of analog CSI symbols 305. Additionally, or alternatively, each parity symbol of the set of parity symbols 335 may be included (e.g., multiplexed in time) before the analog CSI symbols (e.g., prepended before the analog CSI symbols of a given tap) . In some other examples, each parity symbol of the set of parity symbols 335 may be included (e.g., multiplexed in time) after all of the analog CSI symbols associated with each of the active taps including the first set of analog CSI symbols 305, the second set of analog CSI symbols 315, and the third set of analog CSI symbols 325.
[0113] As described herein with reference to FIG. 2, in some implementations, a UE 115 (e.g., the UE 115-a as described with reference to FIG. 2) may transmit an analog CSI report to a network entity 105 (e.g., the network entity 105-a as described with reference to FIG. 2) according to the analog channel feedback scheme 300. In some examples, the UE 115 may transmit the analog CSI report based on performing a DFT on the CSI symbols and the parity symbols, and may transmit the report without channel coding. In some examples, the network entity 105 may obtain the analog CSI report based on performing an IDFT procedure on the received CSI report. In such examples, the network entity 105 may determine an average power level (e.g., transmission power) for each of the channel taps of the active taps based on obtaining the set of parity symbols 335. In such examples, the network entity 105 may determine an average power of the analog CSI feedback (e.g., coefficients) associated with each channel tap (e.g., based on determining the average power of the tap) . For example, the network entity 105 may determine the average power level of the first set of analog CSI symbols 305 based on obtaining the at least one parity symbol 335-a. In such examples, the network entity 105 may determine a SNR of the analog CSI symbols, which may improve analog CSI reliability detection.
[0114] FIG. 4 shows an example of an analog channel feedback scheme 400 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. In some examples, the analog channel feedback scheme 400 may represent aspects of the wireless communications system 100 and the wireless communications system 200.
[0115] In some implementations, the analog channel feedback scheme 400 may include at least one set of analog CSI symbols 405. Additionally, or alternatively, the analog channel feedback scheme 400 may include a set of noise estimation parity symbols 410 (e.g., at least one parity symbol) associated with the at least one set of analog CSI symbols 405. In some examples, a quantity of the set of noise estimation parity symbols 410 may be based at least in part on a quantity of the at least one set of analog CSI symbols 405. The set of noise estimation parity symbols 410 may be included (e.g., multiplexed in time) after the at least one set of analog CSI symbols 405 (e.g., appended after the at least one set of analog CSI symbols 405) as described herein. Additionally, or alternatively, the set of noise estimation parity symbols 410 may be included (e.g., multiplexed in time) before the at least one set of analog CSI symbols 405 (e.g., prepended before the at least one set of analog CSI symbols 405) , or the set of noise estimation parity symbols 410 may be multiplexed in time with (e.g., interleaved in time with) the at least one set of analog CSI symbols 405.
[0116] As described herein with reference to FIG. 2, in some implementations, a UE 115 (e.g., the UE 115-a as described with reference to FIG. 2) may transmit an analog CSI report to a network entity 105 (e.g., the network entity 105-a as described with reference to FIG. 2) according to the analog channel feedback scheme 400. In some examples, the UE 115 may transmit the analog CSI report based on performing a DFT 415 on the at least one set of analog CSI symbols 405 and the set of noise estimation parity symbols 410. In some examples, the quantity of the set of noise estimation parity symbols 410 may be further based on a quantity of samples of the DFT 415 (e.g., an N- point DFT) . In some examples, performing the DFT 415 may produce a set of non-zero power subcarriers 420 (e.g., non-zero power symbols) based on transforming the at least one set of analog CSI symbols 405, and a set of zero power subcarriers 425 based on transforming the set of noise estimation parity symbols 410 (e.g., as described in greater detail with reference to FIG. 2) .
[0117] In some examples, the network entity 105 may determine a noise power level associated with the at least one set of analog CSI symbols 405 based on obtaining (e.g., and measuring or otherwise determining the noise power of) the set of zero power subcarriers 425. Additionally, or alternatively, the network entity 105 may perform an IDFT on at least the set of non-zero power subcarriers 420 to recover the at least one set of analog CSI symbols 405. In such examples, the network entity 105 may remove (e.g., subtract or filter out) the determined noise level from the at least one set of analog CSI symbols 405, which may improve analog CSI reliability detection. The network entity 105 may indicate, to the UE 115, a quantity of null tones, a quantity of noise estimation parity symbols 410, an order or location of the noise estimation parity symbols 410, or any combination thereof.
[0118] FIG. 5 shows an example of a transmission chain 500 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The transmission chain 500 may implement or be implemented by aspects of the wireless communications system 100 or the wireless communications system 200. The transmission chain 500 may additionally include a UE 115 and a network entity 105.
[0119] In some implementations, a transmitting device, such as a UE 115 (e.g., the UE 115-a as described with reference to FIG. 2) may transmit an analog CSI report 505 in accordance with a DFT of one or more analog CSI symbols and one or more parity symbols (e.g., power indication parity symbols, noise estimation parity symbols, or both) . The UE 115 may generate the analog CSI report in accordance with the one or more parity symbols via a DFT-S-OFDM waveform (e.g., one or more DFT-S-OFDM symbols) . In such examples, the UE 115 may use a transmission chain to generate the corresponding DFT-S-OFDM waveform. In such examples, the transmission chain may include a series of components combined in series. For example, the transmission chain may include a DFT component 510, a tone mapping component 515, a DMRS insertion component 520, an OFDM modulation component 525, or the like. The DFT component 510 may perform a DFT (e.g., time-domain to frequency domain transform) on the analog CSI symbols and the parity symbols (e.g., noise detection parity symbols, power indicator parity symbols, or both) . In some examples, the noise detection parity symbols may result in one or more zero power subcarriers being included in the transformed analog CSI feedback based on one or more noise estimation parity symbols being inserted with the analog CSI symbols prior to the DFT. The tone mapping component 515 may map the time-domain symbols of the analog CSI symbols and the parity symbols to one or more subcarrier REs (e.g., tones) for transmission. The DMRS insertion component 520 may insert one or more DMRS symbols to assist a receiving entity (e.g., the network entity 105) with receiving and demodulating uplink signals, and the OFDM modulation component 525 may modulate the analog CSI report to correspond to an OFDM waveform.
[0120] In some implementations, the UE 115 may transmit the resulting OFDM waveform carrying the analog CSI report 505 (e.g., according to the DFT of the analog CSI symbols and the parity symbols) via an uplink channel 530 (e.g., the uplink 210 as described with reference to FIG. 2) . The network entity 105 may obtain the OFDM waveform via the uplink channel 530. In such examples, the network entity 105 may utilize a component chain (e.g., one or more receive chains) to demodulate and recover the original analog CSI report 505 from the OFDM waveform. In such examples, the component chain may include a series of components combined in series. For example, the component chain may include an OFDM demodulation component 535, a channel estimation and equalization component 540, a subcarrier resource element de-mapper 545, an IDFT component 555-a and an IDFT component 555-b (e.g., an IDFT component 555 may include the IDFT component 555-a and the IDFT component 555-b) . In some examples, the OFDM demodulation component 535 may demodulate the OFDM waveform carrying the analog CSI report 505. Additionally, or alternatively, the channel estimation and equalization component 540 and the subcarrier resource element de-mapper 545 may recover the frequency-domain symbols of the analog CSI report 505.
[0121] In some implementations, the network entity 105 may determine a noise power level via a power measurement 550 of the analog CSI feedback based on the frequency-domain representation of the analog CSI report 505 (e.g., before performing an IDFT on the report) . In such examples, the network entity 105 may determine a power level by obtaining, demodulating, and recovering the zero power symbols (e.g., null tones) included in the analog CSI report 505. Additionally, or alternatively, the network entity 105 may perform an IDFT (e.g., via the IDFT component 555) on the frequency-domain symbols of the analog CSI report 505. In such examples, performing the IDFT on the analog CSI symbol symbols may recover the original analog CSI symbols and parity symbols included in the analog CSI report 505. In such examples, the network entity 105 may determine an average power level (e.g., a per-tap average power) of the analog CSI symbols via a signal power measurement 560 based on obtaining and recovering the parity symbols. Additionally, or alternatively, the network entity 105 may determine an uplink SNR 565 of the analog CSI reports based on determining the per-tap average power level and the noise power level of the analog CSI reports, which may improve analog CSI reliability detection. Transmitting the analog CSI report 505 via the DFT-S-OFDM waveform may relatively reduce a peak-to-average power ratio (PAPR) of the transmission, which may further improve analog CSI reliability detection.
[0122] In some examples, the network entity 105 may perform the power measurement 550 prior to the IDFT via the IDFT based on the noise estimation parity symbols (e.g., instead of performing the signal power measurement 560 after the IDFT) . In some examples, the network entity 105 may perform the signal power measurement 560 after the IDFT based on the power indicator parity symbols (e.g., instead of performing the power measurement 550 prior to the IDFT) . In some examples, the network entity 105-a may both perform the power measurement 550 and the IDFT, and the signal power measurement 560 and the IDFT (e.g., in series or in parallel) . Similarly, the UE 115 may insert the power indicator parity symbols (e.g., as illustrated with reference to FIG. 3) , may insert the noise estimation parity symbols (e.g., as illustrated with reference to FIG. 4) , or both, when generating an analog CSI report 505. In some examples, the network entity 105 may configure the UE 115 to insert the power indicator parity symbols, or to insert the noise estimation parity symbols, or both, based on which the UE 115 may generate the analog CSI report 505 and the network entity 105 may interpret the analog CSI report 505.
[0123] FIG. 6 shows an example of a process flow 600 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The process flow 600 may implement or be implemented by aspects of the wireless communications system 100 and the wireless communications system 200. The process flow 600 may include a UE 115-b and a network entity 105-b, which may be examples of the UE 115 and the network entity 105.
[0124] At 605, the network entity 105-b may output control signaling (e.g., RRC signaling or other control signaling) to the UE 115-b. The control signaling may indicate one or more parameters for one or more parity symbols. The one or more parameters may indicate a position of the parity symbols with respect to one or more analog CSI symbols to be generated and transmitted by the UE 115-b (e.g., an ordering or arrangement of the parity symbols and the analog CSI symbols) . The position of the parity symbols (e.g., with reference to the analog CSI symbols) may be further described herein with respect to FIGs. 3 and 4. Additionally, or alternatively, the control signaling may include an indication of a quantity of parity symbols to be generated and transmitted by the UE 115-b. In some examples, the parity symbols may indicate (e.g., or otherwise convey or be used to infer) an average power level of the analog CSI symbols, a noise (e.g., interference) level, a power level associated with the analog CSI symbols, or both.
[0125] At 610, the UE 115-b may generate the analog CSI symbols. The analog CSI symbols may indicate channel coefficients corresponding to a downlink communication channel between the network entity 105-b and the UE 115-b. The analog CSI symbols may be unquantized (e.g., continuous amplitude) CSI feedback (e.g., non-digital feedback) .
[0126] At 615, the UE 115-b may generate the parity symbols. The parity symbols may be based on one or more properties of the reported channel coefficients, which are further described herein with respect to FIG. 2. In some implementations, the UE 115-b may generate at least one parity symbol (e.g., power indicator parity symbols) for each channel tap of a set of active channel taps associated with a downlink communications channel between the UE 115-b and the network entity 105-b. In such implementations, each parity symbol may be associated with a set of analog CSI symbols corresponding to the respective channel tap (e.g., may convey an average power for the corresponding tap) . In some examples, the parity symbols (e.g., noise estimation parity symbols) may be generated to result in zero power subcarriers after the DFT.
[0127] At 620, the UE 115-b may order the analog CSI symbols and the parity symbols. In some implementations, the UE 115-b may order the analog CSI symbols and the parity symbols according to the control signaling received at 605. In some examples, the parity symbols may be included (e.g., multiplexed in time) before the analog CSI symbols associated with a respective channel tap (e.g., prepended before the analog CSI symbols) or included (e.g., multiplexed in time) after the analog CSI symbols associated with the respective channel tap (e.g., appended after the analog CSI messages) . In some examples, each parity symbol of the one or more parity symbols may be included (e.g., multiplexed in time, after) each analog CSI symbol of the one or more analog CSI symbols associated with each active tap (e.g., the parity symbols may succeed the all the analog CSI symbols) . Additionally, or alternatively, the parity symbols may be included with (e.g., multiplexed in time with) the analog CSI symbols (e.g., interleaved in time with the analog CSI symbols) . In some examples, a first set of parity symbols (e.g., the power indicator parity symbols) may be ordered according to a first order or rule (e.g., appended after each tap of the multiple taps) , and a second set of parity symbols (e.g., the noise estimation parity symbols) may be appended after one or all taps) . The CSI report may be based on the ordered analog CSI symbols and the parity symbols.
[0128] At 625, the UE 115-b may perform a DFT on the analog CSI symbols and the parity symbols. In some implementations, performing the DFT may produce one or more zero power subcarriers included in the analog CSI report. In such examples, the zero power subcarriers (e.g., null tones) may be based on one or more noise estimation parity symbols included in the parity symbols. Additionally, or alternatively, a quantity of the zero power symbols may be based on a quantity of analog CSI symbols, a quantity of samples of the DFT (e.g., an N-point DFT) , the control signaling of 605, or any combination thereof.
[0129] At 630, the UE 115-b may transmit the analog CSI report to the network entity 105-b, as further described herein with reference to FIG. 5. The network entity 105-b may, based on receiving the analog CSI report, may determine an average power of each associated tap (e.g., based on the power indicator parity symbols) . The network entity 105-b may use the average power to estimate the per-tap SNR, which can be provided as an input to the per-tap MMSE. In some examples, the network entity 105-b may use the noise estimation parity symbols to estimate noise and interference contained in the analog CSI symbols. In such examples, the network entity 105-b may remove (e.g., subtract or filter out) the determined noise level from the at least one set of analog CSI symbols, which may improve analog CSI reliability detection. The parity symbols may also convey phase information of the associated channel coefficients, and may be used as an analog check (e.g., an analog CRC) to valid a reliability of the received analog CSI report.
[0130] FIG. 7 shows a block diagram 700 of a device 705 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The device 705 may be an example of aspects of a UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. The device 705, or one or more components of the device 705 (e.g., the receiver 710, the transmitter 715, the communications manager 720) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0131] The receiver 710 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to analog channel state information reliability detection) . Information may be passed on to other components of the device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.
[0132] The transmitter 715 may provide a means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to analog channel state information reliability detection) . In some examples, the transmitter 715 may be co-located with a receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.
[0133] The communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be examples of means for performing various aspects of analog channel state information reliability detection as described herein. For example, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
[0134] In some examples, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a digital signal processor (DSP) , a central processing unit (CPU) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .
[0135] Additionally, or alternatively, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor (e.g., referred to as a processor-executable code) . If implemented in code executed by at least one processor, the functions of the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure) .
[0136] In some examples, the communications manager 720 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 710, the transmitter 715, or both. For example, the communications manager 720 may receive information from the receiver 710, send information to the transmitter 715, or be integrated in combination with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.
[0137] The communications manager 720 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 720 is capable of, configured to, or operable to support a means for receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information symbols. The communications manager 720 is capable of, configured to, or operable to support a means for generating the one or more analog channel state information symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling. The communications manager 720 is capable of, configured to, or operable to support a means for transmitting an analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols.
[0138] Additionally, or alternatively, the communications manager 720 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 720 is capable of, configured to, or operable to support a means for receiving control signaling indicating parity symbol information associated with an analog channel state information report. The communications manager 720 is capable of, configured to, or operable to support a means for generating one or more analog channel state information symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols correspond to one or more null tones. The communications manager 720 is capable of, configured to, or operable to support a means for transmitting the analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols in accordance with the control signaling.
[0139] By including or configuring the communications manager 720 in accordance with examples as described herein, the device 705 (e.g., at least one processor controlling or otherwise coupled with the receiver 710, the transmitter 715, the communications manager 720, or a combination thereof) may support techniques for more efficient utilization of communication resources and improved communication reliability, among other benefits.
[0140] FIG. 8 shows a block diagram 800 of a device 805 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The device 805 may be an example of aspects of a device 705 or a UE 115 as described herein. The device 805 may include a receiver 810, a transmitter 815, and a communications manager 820. The device 805, or one or more components of the device 805 (e.g., the receiver 810, the transmitter 815, the communications manager 820) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0141] The receiver 810 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to analog channel state information reliability detection) . Information may be passed on to other components of the device 805. The receiver 810 may utilize a single antenna or a set of multiple antennas.
[0142] The transmitter 815 may provide a means for transmitting signals generated by other components of the device 805. For example, the transmitter 815 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to analog channel state information reliability detection) . In some examples, the transmitter 815 may be co-located with a receiver 810 in a transceiver module. The transmitter 815 may utilize a single antenna or a set of multiple antennas.
[0143] The device 805, or various components thereof, may be an example of means for performing various aspects of analog channel state information reliability detection as described herein. For example, the communications manager 820 may include a position component 825, a parity symbol component 830, a report component 835, a parity information component 840, or any combination thereof. The communications manager 820 may be an example of aspects of a communications manager 720 as described herein. In some examples, the communications manager 820, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 810, the transmitter 815, or both. For example, the communications manager 820 may receive information from the receiver 810, send information to the transmitter 815, or be integrated in combination with the receiver 810, the transmitter 815, or both to obtain information, output information, or perform various other operations as described herein.
[0144] The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. The position component 825 is capable of, configured to, or operable to support a means for receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information symbols. The parity symbol component 830 is capable of, configured to, or operable to support a means for generating the one or more analog channel state information symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling. The report component 835 is capable of, configured to, or operable to support a means for transmitting an analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols.
[0145] Additionally, or alternatively, the communications manager 820 may support wireless communications in accordance with examples as disclosed herein. The parity information component 840 is capable of, configured to, or operable to support a means for receiving control signaling indicating parity symbol information associated with an analog channel state information report. The parity symbol component 830 is capable of, configured to, or operable to support a means for generating one or more analog channel state information symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols correspond to one or more null tones. The report component 835 is capable of, configured to, or operable to support a means for transmitting the analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols in accordance with the control signaling.
[0146] FIG. 9 shows a block diagram 900 of a communications manager 920 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The communications manager 920 may be an example of aspects of a communications manager 720, a communications manager 820, or both, as described herein. The communications manager 920, or various components thereof, may be an example of means for performing various aspects of analog channel state information reliability detection as described herein. For example, the communications manager 920 may include a position component 925, a parity symbol component 930, a report component 935, a parity information component 940, an ordering component 945, a transform component 950, a nulling component 955, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
[0147] The communications manager 920 may support wireless communications in accordance with examples as disclosed herein. The position component 925 is capable of, configured to, or operable to support a means for receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information symbols. The parity symbol component 930 is capable of, configured to, or operable to support a means for generating the one or more analog channel state information symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling. The report component 935 is capable of, configured to, or operable to support a means for transmitting an analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols.
[0148] In some examples, the parity symbol component 930 is capable of, configured to, or operable to support a means for generating a set of multiple parity symbols including the one or more parity symbols for the set of multiple taps on a per-tap basis, one set of parity symbols corresponding to each respective tap of the set of multiple taps. In some examples, the ordering component 945 is capable of, configured to, or operable to support a means for ordering a set analog channel state information symbols of a set of multiple analog channel state information symbols and a set of parity symbols for each respective tap of the set of multiple taps in accordance with the control signaling. In some examples, the transform component 950 is capable of, configured to, or operable to support a means for performing a discrete Fourier transform procedure on the set of multiple parity symbols and the set of multiple analog channel state information symbols in accordance with the ordering, where transmitting the analog channel state information report is based on performing the discrete Fourier transform procedure.
[0149] In some examples, to support generating the one or more parity symbols, the parity symbol component 930 is capable of, configured to, or operable to support a means for generating a parity symbol based on an average power of the one or more analog channel state information symbols associated with the first tap, the one or more parity symbols including a positive real number.
[0150] In some examples, the one or more parity symbols indicates a phase of the one or more analog channel state information symbols associated with the first tap, the one or more parity symbols including a complex value.
[0151] In some examples, the ordering component 945 is capable of, configured to, or operable to support a means for prepending the one or more parity symbols before the one or more analog channel state information symbols in time in accordance with the control signaling. In some examples, the transform component 950 is capable of, configured to, or operable to support a means for performing a discrete Fourier transform procedure on the one or more parity symbols and the one or more analog channel state information symbols, where transmitting the analog channel state information report is based on performing the discrete Fourier transform procedure.
[0152] In some examples, the ordering component 945 is capable of, configured to, or operable to support a means for appending the one or more parity symbols after the one or more analog channel state information symbols in time in accordance with the control signaling. In some examples, the transform component 950 is capable of, configured to, or operable to support a means for performing a discrete Fourier transform procedure on the one or more parity symbols and the one or more analog channel state information symbols, where transmitting the analog channel state information report is based on performing the discrete Fourier transform procedure.
[0153] In some examples, the parity symbol component 930 is capable of, configured to, or operable to support a means for generating an additional one or more analog channel state information symbols and an additional one or more parity symbols corresponding to a second tap of the set of multiple taps. In some examples, the ordering component 945 is capable of, configured to, or operable to support a means for appending the one or more parity symbols and the additional one or more parity symbols after the one or more analog channel state information symbols and the additional one or more analog channel state information symbols. In some examples, the transform component 950 is capable of, configured to, or operable to support a means for performing a discrete Fourier transform procedure on the one or more parity symbols, the additional one or more parity symbols, the one or more analog channel state information symbols, and the additional one or more analog channel state information symbols, where transmitting the analog channel state information report is based on performing the discrete Fourier transform procedure.
[0154] Additionally, or alternatively, the communications manager 920 may support wireless communications in accordance with examples as disclosed herein. The parity information component 940 is capable of, configured to, or operable to support a means for receiving control signaling indicating parity symbol information associated with an analog channel state information report. In some examples, the parity symbol component 930 is capable of, configured to, or operable to support a means for generating one or more analog channel state information symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols correspond to one or more null tones. In some examples, the report component 935 is capable of, configured to, or operable to support a means for transmitting the analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols in accordance with the control signaling.
[0155] In some examples, the position component 925 is capable of, configured to, or operable to support a means for receiving, via the parity symbol information, an indication of a position of the one or more parity symbols with reference to the one or more analog channel state information symbols. In some examples, the ordering component 945 is capable of, configured to, or operable to support a means for ordering the one or more parity symbols and the one or more analog channel state information symbols in accordance with the indication of the position.
[0156] In some examples, to support ordering the one or more parity symbols and the one or more analog channel state information symbols, the ordering component 945 is capable of, configured to, or operable to support a means for prepending the one or more parity symbols before the one or more analog channel state information symbols in time, appending the one or more parity symbols after the one or more analog channel state information symbols in time, interleaving the one or more parity symbols in time with the one or more analog channel state information symbols, or any combination thereof based on the control signaling.
[0157] In some examples, the transform component 950 is capable of, configured to, or operable to support a means for performing a discrete Fourier transform procedure one or more parity symbols and the one or more analog channel state information symbols. In some examples, the nulling component 955 is capable of, configured to, or operable to support a means for generating a set of multiple zero power subcarriers corresponding to the one or more parity symbols and the one or more null tones based on the discrete Fourier transform procedure.
[0158] In some examples, a quantity of parity symbols to be generated based on a quantity of non-zero channel coefficients and a quantity of samples corresponding to the discrete Fourier transform procedure.
[0159] In some examples, the parity information component 940 is capable of, configured to, or operable to support a means for receiving, via the parity symbol information, an indication of a quantity of the one or more parity symbols to be generated, a quantity of the one or more null tones, or both.
[0160] In some examples, the one or more null tones indicate a noise level of the one or more analog channel state information symbols.
[0161] FIG. 10 shows a diagram of a system 1000 including a device 1005 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The device 1005 may be an example of or include components of a device 705, a device 805, or a UE 115 as described herein. The device 1005 may communicate (e.g., wirelessly) with one or more other devices (e.g., network entities 105, UEs 115, or a combination thereof) . The device 1005 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 1020, an input / output (I / O) controller, such as an I / O controller 1010, a transceiver 1015, one or more antennas 1025, at least one memory 1030, code 1035, and at least one processor 1040. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1045) .
[0162] The I / O controller 1010 may manage input and output signals for the device 1005. The I / O controller 1010 may also manage peripherals not integrated into the device 1005. In some cases, the I / O controller 1010 may represent a physical connection or port to an external peripheral. In some cases, the I / O controller 1010 may utilize an operating system such as or another known operating system. Additionally, or alternatively, the I / O controller 1010 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I / O controller 1010 may be implemented as part of one or more processors, such as the at least one processor 1040. In some cases, a user may interact with the device 1005 via the I / O controller 1010 or via hardware components controlled by the I / O controller 1010.
[0163] In some cases, the device 1005 may include a single antenna. However, in some other cases, the device 1005 may have more than one antenna, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 1015 may communicate bi-directionally via the one or more antennas 1025 using wired or wireless links as described herein. For example, the transceiver 1015 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1015 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 1025 for transmission, and to demodulate packets received from the one or more antennas 1025. The transceiver 1015, or the transceiver 1015 and one or more antennas 1025, may be an example of a transmitter 715, a transmitter 815, a receiver 710, a receiver 810, or any combination thereof or component thereof, as described herein.
[0164] The at least one memory 1030 may include random access memory (RAM) and read-only memory (ROM) . The at least one memory 1030 may store computer-readable, computer-executable, or processor-executable code, such as the code 1035. The code 1035 may include instructions that, when executed by the at least one processor 1040, cause the device 1005 to perform various functions described herein. The code 1035 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1035 may not be directly executable by the at least one processor 1040 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1030 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0165] The at least one processor 1040 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs) , one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof) . In some cases, the at least one processor 1040 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the at least one processor 1040. The at least one processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting analog channel state information reliability detection) . For example, the device 1005 or a component of the device 1005 may include at least one processor 1040 and at least one memory 1030 coupled with or to the at least one processor 1040, the at least one processor 1040 and the at least one memory 1030 configured to perform various functions described herein.
[0166] In some examples, the at least one processor 1040 may include multiple processors and the at least one memory 1030 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions described herein. In some examples, the at least one processor 1040 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1040) and memory circuitry (which may include the at least one memory 1030) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 1040 or a processing system including the at least one processor 1040 may be configured to, configurable to, or operable to cause the device 1005 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code 1035 (e.g., processor-executable code) stored in the at least one memory 1030 or otherwise, to perform one or more of the functions described herein.
[0167] The communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1020 is capable of, configured to, or operable to support a means for receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information symbols. The communications manager 1020 is capable of, configured to, or operable to support a means for generating the one or more analog channel state information symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling. The communications manager 1020 is capable of, configured to, or operable to support a means for transmitting an analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols.
[0168] Additionally, or alternatively, the communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1020 is capable of, configured to, or operable to support a means for receiving control signaling indicating parity symbol information associated with an analog channel state information report. The communications manager 1020 is capable of, configured to, or operable to support a means for generating one or more analog channel state information symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols correspond to one or more null tones. The communications manager 1020 is capable of, configured to, or operable to support a means for transmitting the analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols in accordance with the control signaling.
[0169] By including or configuring the communications manager 1020 in accordance with examples as described herein, the device 1005 may support techniques for more efficient utilization of communication resources and improved communication reliability, among other benefits.
[0170] In some examples, the communications manager 1020 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 1015, the one or more antennas 1025, or any combination thereof. Although the communications manager 1020 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 1020 may be supported by or performed by the at least one processor 1040, the at least one memory 1030, the code 1035, or any combination thereof. For example, the code 1035 may include instructions executable by the at least one processor 1040 to cause the device 1005 to perform various aspects of analog channel state information reliability detection as described herein, or the at least one processor 1040 and the at least one memory 1030 may be otherwise configured to, individually or collectively, perform or support such operations.
[0171] FIG. 11 shows a flowchart illustrating a method 1100 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The operations of the method 1100 may be implemented by a UE or its components as described herein. For example, the operations of the method 1100 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0172] At 1105, the method may include receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information symbols. The operations of 1105 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1105 may be performed by a position component 925 as described with reference to FIG. 9.
[0173] At 1110, the method may include generating the one or more analog channel state information symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling. The operations of 1110 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1110 may be performed by a parity symbol component 930 as described with reference to FIG. 9.
[0174] At 1115, the method may include transmitting an analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols. The operations of 1115 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1115 may be performed by a report component 935 as described with reference to FIG. 9.
[0175] FIG. 12 shows a flowchart illustrating a method 1200 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The operations of the method 1200 may be implemented by a UE or its components as described herein. For example, the operations of the method 1200 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0176] At 1205, the method may include receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information symbols. The operations of 1205 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed by a position component 925 as described with reference to FIG. 9.
[0177] At 1210, the method may include generating the one or more analog channel state information symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling. The operations of 1210 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1210 may be performed by a parity symbol component 930 as described with reference to FIG. 9.
[0178] At 1215, the method may include generating a set of multiple parity symbols including the one or more parity symbols for the set of multiple taps on a per-tap basis, one set of parity symbols corresponding to each respective tap of the set of multiple taps. The operations of 1215 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1215 may be performed by a parity symbol component 930 as described with reference to FIG. 9.
[0179] At 1220, the method may include ordering a set analog channel state information symbols of a set of multiple analog channel state information symbols and a set of parity symbols for each respective tap of the set of multiple taps in accordance with the control signaling. The operations of 1220 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1220 may be performed by an ordering component 945 as described with reference to FIG. 9.
[0180] At 1225, the method may include performing a discrete Fourier transform procedure on the set of multiple parity symbols and the set of multiple analog channel state information symbols in accordance with the ordering, where transmitting the analog channel state information report is based on performing the discrete Fourier transform procedure. The operations of 1225 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1225 may be performed by a transform component 950 as described with reference to FIG. 9.
[0181] At 1230, the method may include transmitting an analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols. The operations of 1230 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1230 may be performed by a report component 935 as described with reference to FIG. 9.
[0182] FIG. 13 shows a flowchart illustrating a method 1300 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The operations of the method 1300 may be implemented by a UE or its components as described herein. For example, the operations of the method 1300 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0183] At 1305, the method may include receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information symbols. The operations of 1305 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed by a position component 925 as described with reference to FIG. 9.
[0184] At 1310, the method may include generating the one or more analog channel state information symbols and the one or more parity symbols corresponding to a first tap of a set of multiple taps, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols are based on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling. The operations of 1310 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed by a parity symbol component 930 as described with reference to FIG. 9.
[0185] At 1315, the method may include generating a parity symbol based on an average power of the one or more analog channel state information symbols associated with the first tap, the one or more parity symbols including a positive real number. The operations of 1315 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1315 may be performed by a parity symbol component 930 as described with reference to FIG. 9.
[0186] At 1320, the method may include transmitting an analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols. The operations of 1320 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1320 may be performed by a report component 935 as described with reference to FIG. 9.
[0187] FIG. 14 shows a flowchart illustrating a method 1400 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE or its components as described herein. For example, the operations of the method 1400 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0188] At 1405, the method may include receiving control signaling indicating parity symbol information associated with an analog channel state information report. The operations of 1405 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed by a parity information component 940 as described with reference to FIG. 9.
[0189] At 1410, the method may include generating one or more analog channel state information symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols correspond to one or more null tones. The operations of 1410 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1410 may be performed by a parity symbol component 930 as described with reference to FIG. 9.
[0190] At 1415, the method may include transmitting the analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols in accordance with the control signaling. The operations of 1415 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1415 may be performed by a report component 935 as described with reference to FIG. 9.
[0191] FIG. 15 shows a flowchart illustrating a method 1500 that supports analog channel state information reliability detection in accordance with one or more aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE or its components as described herein. For example, the operations of the method 1500 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0192] At 1505, the method may include receiving control signaling indicating parity symbol information associated with an analog channel state information report. The operations of 1505 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed by a parity information component 940 as described with reference to FIG. 9.
[0193] At 1510, the method may include receiving, via the parity symbol information, an indication of a position of the one or more parity symbols with reference to the one or more analog channel state information symbols. The operations of 1510 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed by a position component 925 as described with reference to FIG. 9.
[0194] At 1515, the method may include generating one or more analog channel state information symbols and one or more parity symbols corresponding to a first tap of a set of multiple taps in accordance with the parity symbol information, each tap in the set of multiple taps corresponding to a respective channel delay associated with channel state information reporting, where the one or more parity symbols correspond to one or more null tones. The operations of 1515 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed by a parity symbol component 930 as described with reference to FIG. 9.
[0195] At 1520, the method may include ordering the one or more parity symbols and the one or more analog channel state information symbols in accordance with the indication of the position. The operations of 1520 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1520 may be performed by an ordering component 945 as described with reference to FIG. 9.
[0196] At 1525, the method may include transmitting the analog channel state information report based on the one or more analog channel state information symbols and the one or more parity symbols in accordance with the control signaling. The operations of 1525 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1525 may be performed by a report component 935 as described with reference to FIG. 9.
[0197] The following provides an overview of aspects of the present disclosure:
[0198] Aspect 1: A method for wireless communications by a UE, comprising: receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog CSI symbols; generating the one or more analog CSI symbols and the one or more parity symbols corresponding to a first tap of a plurality of taps, each tap in the plurality of taps corresponding to a respective channel delay associated with CSI reporting, wherein the one or more parity symbols are based at least in part on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling; and transmitting an analog CSI report based at least in part on the one or more analog CSI symbols and the one or more parity symbols.
[0199] Aspect 2: The method of aspect 1, further comprising: generating a plurality of parity symbols comprising the one or more parity symbols for the plurality of taps on a per-tap basis, one set of parity symbols corresponding to each respective tap of the plurality of taps; ordering a set analog CSI symbols of a plurality of analog CSI symbols and a set of parity symbols for each respective tap of the plurality of taps in accordance with the control signaling; and performing a DFT procedure on the plurality of parity symbols and the plurality of analog CSI symbols in accordance with the ordering, wherein transmitting the analog CSI report is based at least in part on performing the DFT procedure.
[0200] Aspect 3: The method of any of aspects 1 through 2, wherein generating the one or more parity symbols further comprises: generating a parity symbol based at least in part on an average power of the one or more analog CSI symbols associated with the first tap, the one or more parity symbols comprising a positive real number.
[0201] Aspect 4: The method of any of aspects 1 through 2, wherein the one or more parity symbols indicates a phase of the one or more analog CSI symbols associated with the first tap, the one or more parity symbols comprising a complex value.
[0202] Aspect 5: The method of any of aspects 1 through 4, further comprising: prepending the one or more parity symbols before the one or more analog CSI symbols in time in accordance with the control signaling; and performing a DFT procedure on the one or more parity symbols and the one or more analog CSI symbols, wherein transmitting the analog CSI report is based at least in part on performing the DFT procedure.
[0203] Aspect 6: The method of any of aspects 1 through 4, further comprising: appending the one or more parity symbols after the one or more analog CSI symbols in time in accordance with the control signaling; and performing a DFT procedure on the one or more parity symbols and the one or more analog CSI symbols, wherein transmitting the analog CSI report is based at least in part on performing the DFT procedure.
[0204] Aspect 7: The method of any of aspects 1 through 4, further comprising: generating an additional one or more analog CSI symbols and an additional one or more parity symbols corresponding to a second tap of the plurality of taps; appending the one or more parity symbols and the additional one or more parity symbols after the one or more analog CSI symbols and the additional one or more analog CSI symbols; and performing a DFT procedure on the one or more parity symbols, the additional one or more parity symbols, the one or more analog CSI symbols, and the additional one or more analog CSI symbols, wherein transmitting the analog CSI report is based at least in part on performing the DFT procedure.
[0205] Aspect 8: A method for wireless communications by a UE, comprising: receiving control signaling indicating parity symbol information associated with an analog CSI report; generating one or more analog CSI symbols and one or more parity symbols corresponding to a first tap of a plurality of taps in accordance with the parity symbol information, each tap in the plurality of taps corresponding to a respective channel delay associated with CSI reporting, wherein the one or more parity symbols correspond to one or more null tones; and transmitting the analog CSI report based at least in part on the one or more analog CSI symbols and the one or more parity symbols in accordance with the control signaling.
[0206] Aspect 9: The method of aspect 8, further comprising: receiving, via the parity symbol information, an indication of a position of the one or more parity symbols with reference to the one or more analog CSI symbols; and ordering the one or more parity symbols and the one or more analog CSI symbols in accordance with the indication of the position.
[0207] Aspect 10: The method of aspect 9, wherein ordering the one or more parity symbols and the one or more analog CSI symbols comprises: prepending the one or more parity symbols before the one or more analog CSI symbols in time, appending the one or more parity symbols after the one or more analog CSI symbols in time, interleaving the one or more parity symbols in time with the one or more analog CSI symbols, or any combination thereof based at least in part on the control signaling.
[0208] Aspect 11: The method of any of aspects 8 through 10, further comprising: performing a DFT procedure one or more parity symbols and the one or more analog CSI symbols; and generating a plurality of zero power subcarriers corresponding to the one or more parity symbols and the one or more null tones based at least in part on the DFT procedure.
[0209] Aspect 12: The method of aspect 11, wherein a quantity of parity symbols to be generated based at least in part on a quantity of non-zero channel coefficients and a quantity of samples corresponding to the DFT procedure.
[0210] Aspect 13: The method of any of aspects 8 through 12, further comprising: receiving, via the parity symbol information, an indication of a quantity of the one or more parity symbols to be generated, a quantity of the one or more null tones, or both.
[0211] Aspect 14: The method of any of aspects 8 through 13, wherein the one or more null tones indicate a noise level of the one or more analog CSI symbols.
[0212] Aspect 15: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 1 through 7.
[0213] Aspect 16: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 7.
[0214] Aspect 17: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 7.
[0215] Aspect 18: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 8 through 14.
[0216] Aspect 19: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 8 through 14.
[0217] Aspect 20: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 8 through 14.
[0218] It should be noted that the methods described herein describe possible implementations. The operations and the steps may be rearranged or otherwise modified and other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0219] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications 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, as well as other systems and radio technologies not explicitly mentioned herein.
[0220] Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0221] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, a graphics processing unit (GPU) , a neural processing unit (NPU) , 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. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) . Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.
[0222] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as or transmitted using one or more instructions or code of a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0223] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and Blu-ray disc. Disks may reproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.
[0224] As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such 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) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”
[0225] As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. For example, if a claim recites “acomponent” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “acomponent” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components, ” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ”
[0226] The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database, or another data structure) , ascertaining, and the like. Also, “determining” can include receiving (e.g., receiving information) , accessing (e.g., accessing data stored in memory) , and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.
[0227] In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label or other subsequent reference label.
[0228] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some figures, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.
[0229] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) , comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:receive control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information symbols;generate the one or more analog channel state information symbols and the one or more parity symbols corresponding to a first tap of a plurality of taps, each tap in the plurality of taps corresponding to a respective channel delay associated with channel state information reporting, wherein the one or more parity symbols are based at least in part on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling; andtransmit an analog channel state information report based at least in part on the one or more analog channel state information symbols and the one or more parity symbols.2.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:generate a plurality of parity symbols comprising the one or more parity symbols for the plurality of taps on a per-tap basis, one set of parity symbols corresponding to each respective tap of the plurality of taps;order a set analog channel state information symbols of a plurality of analog channel state information symbols and a set of parity symbols for each respective tap of the plurality of taps in accordance with the control signaling; andperform a discrete Fourier transform procedure on the plurality of parity symbols and the plurality of analog channel state information symbols in accordance with the ordering, wherein transmitting the analog channel state information report is based at least in part on performing the discrete Fourier transform procedure.3.The UE of claim 1, wherein, to generate the one or more parity symbols, the one or more processors are individually or collectively further operable to execute the code to cause the UE to:generate a parity symbol based at least in part on an average power of the one or more analog channel state information symbols associated with the first tap, the one or more parity symbols comprising a positive real number.4.The UE of claim 1, wherein the one or more parity symbols indicates a phase of the one or more analog channel state information symbols associated with the first tap, the one or more parity symbols comprising a complex value.5.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:prepend the one or more parity symbols before the one or more analog channel state information symbols in time in accordance with the control signaling; andperform a discrete Fourier transform procedure on the one or more parity symbols and the one or more analog channel state information symbols, wherein transmitting the analog channel state information report is based at least in part on performing the discrete Fourier transform procedure.6.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:append the one or more parity symbols after the one or more analog channel state information symbols in time in accordance with the control signaling; andperform a discrete Fourier transform procedure on the one or more parity symbols and the one or more analog channel state information symbols, wherein transmitting the analog channel state information report is based at least in part on performing the discrete Fourier transform procedure.7.The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:generate an additional one or more analog channel state information symbols and an additional one or more parity symbols corresponding to a second tap of the plurality of taps;append the one or more parity symbols and the additional one or more parity symbols after the one or more analog channel state information symbols and the additional one or more analog channel state information symbols; andperform a discrete Fourier transform procedure on the one or more parity symbols, the additional one or more parity symbols, the one or more analog channel state information symbols, and the additional one or more analog channel state information symbols, wherein transmitting the analog channel state information report is based at least in part on performing the discrete Fourier transform procedure.8.A user equipment (UE) , comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:receive control signaling indicating parity symbol information associated with an analog channel state information report;generate one or more analog channel state information symbols and one or more parity symbols corresponding to a first tap of a plurality of taps in accordance with the parity symbol information, each tap in the plurality of taps corresponding to a respective channel delay associated with channel state information reporting, wherein the one or more parity symbols correspond to one or more null tones; andtransmit the analog channel state information report based at least in part on the one or more analog channel state information symbols and the one or more parity symbols in accordance with the control signaling.9.The UE of claim 8, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:receive, via the parity symbol information, an indication of a position of the one or more parity symbols with reference to the one or more analog channel state information symbols; andorder the one or more parity symbols and the one or more analog channel state information symbols in accordance with the indication of the position.10.The UE of claim 9, wherein, to order the one or more parity symbols and the one or more analog channel state information symbols, the one or more processors are individually or collectively operable to execute the code to cause the UE to:prepend the one or more parity symbols before the one or more analog channel state information symbols in time, appending the one or more parity symbols after the one or more analog channel state information symbols in time, interleaving the one or more parity symbols in time with the one or more analog channel state information symbols, or any combination thereof based at least in part on the control signaling.11.The UE of claim 8, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:perform a discrete Fourier transform procedure one or more parity symbols and the one or more analog channel state information symbols; andgenerate a plurality of zero power subcarriers corresponding to the one or more parity symbols and the one or more null tones based at least in part on the discrete Fourier transform procedure.12.The UE of claim 11, wherein a quantity of parity symbols to be generated based at least in part on a quantity of non-zero channel coefficients and a quantity of samples corresponding to the discrete Fourier transform procedure.13.The UE of claim 8, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:receive, via the parity symbol information, an indication of a quantity of the one or more parity symbols to be generated, a quantity of the one or more null tones, or both.14.The UE of claim 8, wherein the one or more null tones indicate a noise level of the one or more analog channel state information symbols.15.A method for wireless communications by a user equipment (UE) , comprising:receiving control signaling indicating a position of one or more parity symbols with reference to one or more analog channel state information symbols;generating the one or more analog channel state information symbols and the one or more parity symbols corresponding to a first tap of a plurality of taps, each tap in the plurality of taps corresponding to a respective channel delay associated with channel state information reporting, wherein the one or more parity symbols are based at least in part on a quantity of non-zero channel coefficients of the first tap and the position of the one or more parity symbols is in accordance with the control signaling; andtransmitting an analog channel state information report based at least in part on the one or more analog channel state information symbols and the one or more parity symbols.16.The method of claim 15, further comprising:generating a plurality of parity symbols comprising the one or more parity symbols for the plurality of taps on a per-tap basis, one set of parity symbols corresponding to each respective tap of the plurality of taps;ordering a set analog channel state information symbols of a plurality of analog channel state information symbols and a set of parity symbols for each respective tap of the plurality of taps in accordance with the control signaling; andperforming a discrete Fourier transform procedure on the plurality of parity symbols and the plurality of analog channel state information symbols in accordance with the ordering, wherein transmitting the analog channel state information report is based at least in part on performing the discrete Fourier transform procedure.17.The method of claim 15, wherein generating the one or more parity symbols further comprises:generating a parity symbol based at least in part on an average power of the one or more analog channel state information symbols associated with the first tap, the one or more parity symbols comprising a positive real number.18.The method of claim 15, wherein the one or more parity symbols indicates a phase of the one or more analog channel state information symbols associated with the first tap, the one or more parity symbols comprising a complex value.19.The method of claim 15, further comprising:prepending the one or more parity symbols before the one or more analog channel state information symbols in time in accordance with the control signaling; andperforming a discrete Fourier transform procedure on the one or more parity symbols and the one or more analog channel state information symbols, wherein transmitting the analog channel state information report is based at least in part on performing the discrete Fourier transform procedure.20.The method of claim 15, further comprising:appending the one or more parity symbols after the one or more analog channel state information symbols in time in accordance with the control signaling; andperforming a discrete Fourier transform procedure on the one or more parity symbols and the one or more analog channel state information symbols, wherein transmitting the analog channel state information report is based at least in part on performing the discrete Fourier transform procedure.