Channel state information (CSI) reporting with a total bit allocation for quantization
By employing a total bit allocation for quantization in CSI reporting, the UE optimizes resource utilization and enhances communication reliability in wireless systems by balancing amplitude and phase quantization bits, addressing the inefficiencies in PMI reporting.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2026-03-26
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Figure CN2024119896_26032026_PF_FP_ABST
Abstract
Description
CHANNEL STATE INFORMATION (CSI) REPORTING WITH A TOTAL BIT ALLOCATION FOR QUANTIZATION
[0001] FIELD OF TECHNOLOGY
[0002] The following relates to wireless communications, including channel state information (CSI) reporting utilizing a total bit allocation for quantization.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) .
[0004] In some systems, a UE may report channel state information (CSI) to a network entity for communications. For example, the UE may report a precoding matrix indicator (PMI) to the network entity. However, reporting the PMI may involve reporting a significant quantity of bits defining the PMI (e.g., defining precoder weights) , potentially resulting in inefficient resource usage for reporting the CSI.SUMMARY
[0005] 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.
[0006] A user equipment (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 transmit a channel state information (CSI) report that indicates one or more precoding matrix indicators (PMIs) , channel reporting information, or both based on a total overhead for quantization. The CSI report may include: a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization; and a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits, the first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits corresponding to the one or more PMIs, the channel reporting information, or both. The one or more processors may individually or collectively be further operable to execute the code to cause the UE to communicate signaling based on the one or more PMIs, the channel reporting information, or both indicated by the CSI report.
[0007] A method for wireless communications by a UE is described. The method may include transmitting a CSI report that indicates one or more PMIs, channel reporting information, or both based on a total overhead for quantization. The CSI report may include: a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization; and a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits, the first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits corresponding to the one or more PMIs, the channel reporting information, or both. The method may further include communicating signaling based on the one or more PMIs, the channel reporting information, or both indicated by the CSI report.
[0008] Another UE for wireless communications is described. The UE may include means for transmitting a CSI report that indicates one or more PMIs, channel reporting information, or both based on a total overhead for quantization. The CSI report may include: a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization; and a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits, the first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits corresponding to the one or more PMIs, the channel reporting information, or both. The UE may further include means for communicating signaling based on the one or more PMIs, the channel reporting information, or both indicated by the CSI report.
[0009] 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 transmit a CSI report that indicates one or more PMIs, channel reporting information, or both based on a total overhead for quantization. The CSI report may include: a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization; and a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits, the first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits corresponding to the one or more PMIs, the channel reporting information, or both. The code may include instructions further executable by the one or more processors to communicate signaling based on the one or more PMIs, the channel reporting information, or both indicated by the CSI report.
[0010] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a CSI report configuration message that indicates a threshold quantity of non-zero coefficients for reporting, where the total overhead for quantization may be based on the threshold quantity of non-zero coefficients for reporting.
[0011] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the total overhead for quantization includes a third quantity of bits equal to the threshold quantity of non-zero coefficients for reporting multiplied by a sum of the second quantity of quantization bits associated with the amplitude quantization and a fourth quantity of quantization bits associated with phase quantization.
[0012] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting the first quantity of non-zero amplitude coefficients, where the first quantity of non-zero amplitude coefficients may be different from the threshold quantity of non-zero coefficients for reporting.
[0013] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the first quantity of non-zero amplitude coefficients may be greater than or less than the threshold quantity of non-zero coefficients for reporting.
[0014] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a control message that indicates a modulation and coding scheme (MCS) value, a resource allocation indication, or both for the CSI report, where the total overhead for quantization may be based on the MCS value, the resource allocation indication, or both.
[0015] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting the first quantity of non-zero amplitude coefficients for the CSI report based on the total overhead for quantization, the second quantity of quantization bits associated with the amplitude quantization, or both.
[0016] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting a third quantity of quantization bits associated with phase quantization based on the total overhead for quantization and the first set of multiple amplitude quantization bits, where the second set of multiple phase quantization bits may be based on the third quantity of quantization bits associated with the phase quantization.
[0017] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, a third quantity of the second set of multiple phase quantization bits may be equal to a fourth quantity of bits of the total overhead for quantization minus a fifth quantity of the first set of multiple amplitude quantization bits.
[0018] 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
[0019] FIGs. 1 and 2 show examples of wireless communications systems that support channel state information (CSI) reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure.
[0020] FIG. 3 shows an example of precoder quantization that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure.
[0021] FIG. 4 shows an example of a process flow that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure.
[0022] FIGs. 5 and 6 show block diagrams of devices that support CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure.
[0023] FIG. 7 shows a block diagram of a communications manager that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure.
[0024] FIG. 8 shows a diagram of a system including a device that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure.
[0025] FIGs. 9 and 10 show flowcharts illustrating methods that support CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure.DETAILED DESCRIPTION
[0026] In some wireless communications systems, a user equipment (UE) and a network entity may support precoding of wireless communications. For example, a wireless communication device (e.g., a UE or network entity) may transmit signaling using a combination of antenna elements in accordance with a specific configuration of precoder weights applied to different spatial streams. In some cases, the precoding may improve communication reliability, spatial resource utilization, or both. To support the precoding, the UE may indicate, via a channel state information (CSI) report, one or more precoding matrix indicators (PMIs) to the network entity. Additionally, or alternatively, the UE may indicate other CSI, such as channel reporting information, to the network entity. In some cases, reporting the one or more PMIs, the channel reporting information, or both may involve a significant quantity of bits, potentially affecting the overhead of the CSI report, the performance of the precoding, or both.
[0027] The techniques described herein may support a UE reporting precoder information, channel reporting information, or both via a CSI report using a total bit allocation for quantization. For example, the UE may determine a total overhead allocated for indicating quantization information (e.g., precoder quantization information, channel reporting quantization information) via the CSI report. The UE may perform precoding, channel reporting, or both to utilize the total overhead allocation (e.g., maximizing, optimizing, or otherwise improving payload utilization) . Using the total overhead allocation for quantization may improve the performance of the quantization at the UE.
[0028] The UE may include, in the CSI report, sets of amplitude quantization bits and phase quantization bits representing precoder information (e.g., one or more PMIs) , channel reporting information, or both. A quantity of the amplitude quantization bits may be based on a quantity of non-zero amplitude coefficients for reporting and a quantity of quantization bits associated with amplitude quantization. A quantity of the phase quantization bits may be based on the total overhead and the determined quantity of the amplitude quantization bits (e.g., to fill the remaining resources of the total overhead with the phase quantization bits) . The UE may select a process for phase quantization to achieve the full utilization of the allocated total overhead, supporting flexible quantization techniques at the UE. The UE may transmit the CSI report to a network entity, and the UE and network entity may communicate signaling based on the reported CSI. For example, the network entity may select a PMI for downlink transmission based on the reported precoder information.
[0029] Aspects of the disclosure are initially described in the context of wireless communications systems. Additional aspects of the disclosure may be described with reference to precoder quantization and a process flow. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to CSI reporting with a total bit allocation for quantization.
[0030] FIG. 1 shows an example of a wireless communications system 100 that supports CSI reporting with a total bit allocation for quantization 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.
[0031] 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) .
[0032] 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.
[0033] 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.
[0034] 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.
[0035] 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) .
[0036] 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) ) .
[0037] 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.
[0038] 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.
[0039] 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 channel state information (csi) reporting with a total bit allocation for quantization 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) .
[0040] 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.
[0041] 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.
[0042] 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) .
[0043] 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.
[0044] 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) .
[0045] 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.
[0046] 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) ) .
[0047] 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) .
[0048] 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.
[0049] 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.
[0050] 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.
[0051] 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.
[0052] 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.
[0053] 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.
[0054] 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.
[0055] 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) .
[0056] 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.
[0057] 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.
[0058] 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 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) .
[0059] 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) .
[0060] The wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. An RLC layer may perform packet segmentation and reassembly to communicate via logical channels. A MAC layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer also may implement error detection techniques, error correction techniques, or both to support retransmissions to improve link efficiency. In the control plane, an RRC layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a network entity 105 or a core network 130 supporting radio bearers for user plane data. A PHY layer may map transport channels to physical channels.
[0061] 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.
[0062] In some wireless communications systems 100, a UE 115 may report CSI to a network entity 105 via control signaling. For example, the UE 115 may transmit a CSI report including a quantized precoder, a quantized channel, or both. In some examples, reporting the CSI may involve a tradeoff between signaling overhead and performance. For example, using relatively more bits to indicate the CSI may improve performance (e.g., supporting more granular CSI options, more detailed CSI, more reliable CSI indications, or any combination thereof) , while using relatively fewer bits may improve (e.g., reduce) the report overhead. The UE 115 may use a quantizer, such as a polar quantizer, to quantize precoder coefficients (e.g., non-zero coefficients defining the precoder) , channel coefficients (e.g., non-zero coefficients defining the channel) , or both into amplitude and phase elements. The UE 115 may report the quantized amplitude and phase elements via the CSI report, and the network entity 105 receiving the CSI report may determine the reported precoder, channel information, or both based on the quantized amplitude and phase elements. The network entity 105 may use the reported precoder, channel, or both for communications or to select another precoder or channel for communications (e.g., downlink transmissions or other communications) .
[0063] The UE 115 may realize a “filling gain” by fully utilizing a payload of the CSI report allocated for the quantized bits. The “filling gain” may be an example of a performance gain associated with filling the allocated payload with relevant bits indicating CSI. For example, the UE 115 may determine an overhead allocated for reporting the quantized bits. In some implementations, this overhead may correspond to a field size of the CSI report. The UE 115 may store an indication of the overhead, or the network entity 105 may configure the UE 115 with the overhead. The UE 115 may perform quantization to use the entire overhead (e.g., a full set of bits) allocated for reporting the quantized amplitude and phase elements to improve the quantization performance. Additionally, or alternatively, the UE 115 may select (e.g., flexibly, dynamically) a process for quantization (e.g., phase quantization, amplitude quantization, or both) to generate a set of quantized bits that fills the allocated overhead, improving the adaptability of the UE 115.
[0064] FIG. 2 shows an example of a wireless communications system 200 that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure. The wireless communications system 200 may be an example of a wireless communications system 100. The wireless communications system 200 may include a network entity 105-a and a UE 115-a, which may be respective examples of a network entity 105 and a UE 115 as described with reference to FIG. 1. The network entity 105-a may serve a coverage area 110-a, which may be an example of a coverage area 110 as described with reference to FIG. 1. The network entity 105-a may configure the UE 115-ato transmit a CSI report 220. For the CSI report 220, the UE 115-a may perform quantization of CSI (e.g., precoder information, channel reporting information) in accordance with a total overhead for quantization 235. For example, the UE 115-a may select one or more parameters for quantization to fill the total overhead of the CSI report 220 allocated for quantization bits. The UE 115-a may transmit the CSI report 220 including the resulting quantization bits to the network entity 105-a.
[0065] In some examples, CSI reporting may involve Type-II CSI reporting, eType-II CSI reporting, FeType-II CSI reporting, coherent joint transmission (CJT) CSI reporting, high-Doppler CSI reporting, 32-port or greater CSI reporting, or any combination thereof. The UE 115-a may report a set of CSI via the CSI reporting, including precoder information, channel reporting information, or both. The CSI may be reported as quantized information, such as a quantized precoder, a quantized channel, or both. For example, the precoder information may be reported as quantized precoder information (e.g., quantized values representing one or more PMIs for one or more precoders) . In some examples, the UE 115-a may use a polar quantizer to quantize the precoder information. For example, the UE 115-a may include an amplitude quantizer 240, a phase quantizer 245, or both. In some implementations, the amplitude quantizer 240, the phase quantizer 245, or both may be examples of polar quantizers. In some other implementations, the amplitude quantizer 240 and the phase quantizer 245 may be components or aspects of a polar quantizer. Polar quantization may determine an amplitude element and a phase element representing a non-zero coefficient value of a precoder (e.g., a PMI) . The UE 115-a may use polar quantization to determine a set of amplitude quantization bits 225 and a set of phase quantization bits 230 defining, or otherwise indicating or representing, one or more precoders (e.g., one or more PMIs) for reporting via the CSI report 220.
[0066] The UE 115-a may determine a total overhead for quantization 235 (e.g., a quantization payload, Ntotal) allocated for the CSI report 220. In some examples, the UE 115-a may be configured with a fixed quantity of bits allocated for precoder quantization. In some other examples, the network entity 105-a may dynamically or semi-statically configure the UE 115-awith a quantity of bits allocated for precoder quantization. For example, the network entity 105-a may transmit, via a downlink channel 205, control information 215 indicating the total overhead for quantization 235. In some implementations, an RRC message, a MAC control element (CE) , a downlink control information (DCI) message, a CSI report configuration message, or any other control signaling may include the control information 215.
[0067] In some examples, the control information 215 may configure a threshold (e.g., maximum) payload for quantization. For example, the control information 215 (e.g., via a CSI report configuration message) may indicate a K0 parameter. In some other examples, the UE 115-a may infer, or otherwise determine, a value of the K0parameter based on one or more other parameters. The K0 parameter may indicate a threshold (e.g., maximum) quantity of precoder coefficients for reporting. The UE 115-amay determine the threshold payload for quantization (e.g., the total overhead for quantization 235) as (Qamp+Qphase) ×K0, where Qamp represents a quantity of bits used to quantize one amplitude value and Qphase represents a quantity of bits used to quantize one phase value. The values for Qamp and Qphase used to determine the total overhead for quantization 235 may be the actual quantities of bits used for quantization or may be default or configured quantities of bits for quantization. For example, the UE 115-a may determine a default value of three bits for amplitude quantization (e.g., Qamp=3) and a default value of four bits for phase quantization (e.g., Qphase=4) . The UE 115-a may use these values and the configured K0 value to calculate the total overhead for quantization 235 (e.g., the total quantity of bits to allocate for quantized precoder information) . However, the UE 115-a may flexibly determine different values to use for Qamp, Qphase, or both when performing precoder quantization, for example, to support utilizing the total overhead for quantization 235.
[0068] In some other examples, the UE 115-a may determine the threshold payload for quantization (e.g., the total overhead for quantization 235) based on a resource configuration for the CSI report 220, an MCS value, or both. For example, the control information 215 may indicate a set of resource elements (REs) configured for the CSI report 220, an MCS value configured for UE transmission, or both. Similar to data channel processes, the UE 115-a may determine the CSI report payload size supported by the configured resource allocation in accordance with the MCS value. The UE 115-amay determine the available threshold payload for quantization based on the supported CSI report payload size.
[0069] The UE 115-a may select one or more precoders to report to the network entity 105-a. The UE 115-a may use one or more respective PMIs to indicate the one or more precoders. In some examples, the network entity 105-a may transmit one or more reference signals (e.g., CSI reference signals (CSI-RSs) ) to the UE 115-a. The UE 115-amay monitor for the reference signals and may select the one or more precoders based on measurements of the reference signals. For example, the UE 115-a may select the one or more precoders for the network entity 105-ato use for downlink transmissions to satisfy a channel quality threshold, a signal strength threshold, or some other metric. The UE 115-a may report the selected one or more precoders via the CSI report 220 transmitted via an uplink channel 210. The network entity 105-areceiving the CSI report 220 may select a precoder, or a set of precoders, for communications (e.g., downlink transmission via a downlink channel 205, uplink reception via an uplink channel 210) based on the CSI report 220.
[0070] Some other systems may use a subset of the bits allocated for quantization in a CSI report. For example, such systems may use fixed quantities of bits for amplitude and phase quantization, such that the overhead used for quantization depends on the quantity of non-zero coefficients to report. However, such systems may fail to effectively use the entire quantity of bits allocated for quantization, reducing the quantization performance of precoder information reporting.
[0071] In contrast, the wireless communications system 200 may support flexible quantization techniques to utilize the full set of bits allocated for quantization (e.g., the total overhead for quantization 235) . The UE 115-a may use a “hierarchical quantization” technique in which the UE 115-a performs phase quantization based on an amplitude quantization. The UE 115-a may report one or more precoders (e.g., PMIs) , where a precoder may include one or more layers, may correspond to one or more sub- bands, or both. The UE 115-a may compress, quantize, and report the one or more precoders. In some examples, the UE 115-a may first perform amplitude quantization on one or more precoder coefficients (e.g., non-zero coefficients) to obtain a set of amplitude quantization bits 225. The UE 115-a may derive phase quantization bits 230 for the different amplitudes according to a deterministic rule (e.g., a rule known by-or otherwise synchronized between-both the UE 115-a and the network entity 105-a) . Accordingly, the network entity 105-areceiving the CSI report 220 can recover the phase information without ambiguity by applying the same deterministic rule. The phase vector may be considered a “vector quantizer” or a “vector phase quantizer” used to realize the filling gain (e.g., utilize the threshold payload for quantization to report CSI) .
[0072] The UE 115-a may quantize amplitude bits for non-zero amplitude coefficients and may quantize phase bits for non-zero phase coefficients of a precoder, but the UE 115-a may refrain from quantizing (e.g., and reporting) amplitude bits for zero amplitude coefficients and phase bits for zero phase coefficients. In some examples, the UE 115-a may improve resource utilization by allocating zero amplitude coefficients-related amplitude savings to phase quantization. For example, available bits of the total overhead for quantization 235 not used for amplitude quantization bits 225 based on zero amplitude coefficients may instead be reused for phase quantization bits 230.
[0073] Additionally, or alternatively, the UE 115-a may perform coefficient selection for reporting (e.g., independent of the network entity 105-a or a configured coefficient upper limit, such as K0 per layer or 2K0 across all layers for precoder reporting or K0 per receiver or 2K0 across all receivers for channel reporting) . For example, the UE 115-a may include a UE-side function that supports selecting a quantity of coefficients (e.g., non-zero amplitude coefficients, non-zero phase coefficients) to report. The UE 115-a may select the quantity of coefficients based on the total overhead for quantization 235. However, the UE 115-a may flexibly select the quantity of coefficients supported by the total overhead for quantization 235 based on modifying the quantization techniques used for amplitude quantization, phase quantization, or both. According to this flexible coefficient selection, the UE 115-a may support improved quantization performance for any (or almost any) quantity of coefficients selected for reporting.
[0074] In some examples, the UE 115-a may use a fixed quantity of bits for amplitude quantization, Qamp. The UE 115-a may select a quantity of non-zero amplitude coefficients for reporting, K, such that Namp=K×Qamp and Namp<Ntotal. The UE 115-a may determine the remaining bits available for phase quantization according to Nphase=Ntotal-Namp, where Nphase>0. In some examples, the UE 115-a may implement a search method to select the quantity of non-zero amplitude coefficients for reporting, K, to optimize quantization performance. For example, the UE 115-a may use a bi-selection method for K within and In some implementations, the UE 115-a may optimize for a mean squared error (MSE) for the CSI report 220. In some examples, the UE 115-a may select the quantity of non-zero amplitude coefficients for reporting, K, based on assuming at least one or two bits on average for phase compression / quantization. Rather than using a fixed quantity of bits for phase quantization, Qphase, the UE 115-a may use a vector phase quantizer that supports different phase quantizations to fit within the total overhead for quantization 235.
[0075] In some examples, the UE 115-a may determine a CSI payload (e.g., a payload of the CSI report 220) according to the threshold payload for quantization (e.g., the payload with maximum coefficients) .
[0076] The UE 115-a may use the vector phase quantizer with conditional amplitudes for CSI (e.g., precoder information) quantization and reporting. The UE 115-a may derive an overall bits allocation for quantization (e.g., the total overhead for quantization 235) based on an MCS value, a configuration (e.g., via control information 215) , the CSI report 220, or any combination thereof. The UE 115-a may reuse any savings from zero-amplitude coefficients for phase quantization reporting (e.g., for indicating the phase quantization bits 230) . The UE 115-a may adjust, or otherwise adapt or select, the quantity of coefficients to report based on a threshold total reporting overhead (e.g., the total overhead for quantization 235) . In some examples, the UE 115-a may indicate the quantity of reported coefficients via uplink control information (UCI) Part 1, where the quantization bits (e.g., the amplitude quantization bits 225 and the phase quantization bits 230) may be reported in UCI Part 2.
[0077] FIG. 3 shows an example of precoder quantization 300 that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure. A UE, such as a UE 115 as described with reference to FIGs. 1 and 2, may perform the precoder quantization 300 to efficiently report precoder information to a network entity, such as a network entity 105. The UE 115 may improve the quantization performance of the precoder quantization 300 by fully utilizing a payload allocated for quantization reporting via a CSI report. In the following description of the precoder quantization 300, some operations may be omitted, other operations may be added, or both. Further, although some operations or signaling may be shown to occur at different times for discussion purposes, these operations may occur at the same time or in a different order than shown.
[0078] At 305, the UE 115 may determine, or otherwise select, one or more precoders for reporting. The UE 115 may select a precoder based on measurements of one or more reference signals (e.g., CSI-RSs) . The UE 115 may calculate a precoder for each sub-band for communication, for example, as a linear combination of spatial beams. The precoder may be represented, or otherwise indicated, by a PMI, a set of precoder weights, or both. For example, the precoder for a specific layer across multiple PMI sub-bands may be defined-or otherwise indicated-by a matrix of precoder values (e.g., coefficients) .
[0079] At 310, the UE 115 may aggregate the coefficients for each sub-band (e.g., per layer) . The UE 115 may report a quantity of non-zero coefficients per layer. Based on using the techniques described herein, the UE 115 may report greater than K0 non-zero coefficients per layer, greater than 2K0 non-zero coefficients for multiple layers (e.g., across all layers) , or both. Unreported values may implicitly indicate zero coefficients, such that a network entity 105 receiving the CSI report may set unreported coefficients to zero.
[0080] At 315, the UE 115 may perform compression of the coefficients (e.g., the non-zero coefficients) . In some examples, the UE 115 may perform frequency domain compression of the coefficients via a DFT basis. Additionally, or alternatively, the UE 115 may compress the coefficients, the precoders, the channels, the covariance matrices, or any combination thereof in the spatial domain, the frequency domain, the time domain, or any combination thereof. The compression may result in amplitude and phase components of the coefficients for reporting.
[0081] At 320, the UE 115 may quantize the non-zero amplitude coefficients into amplitude quantization bits. In some examples, the amplitude quantization bits may indicate differential amplitude as compared to a strongest coefficient. The quantization may be layer-independent. In some examples, the UE 115 may use three bits to quantize the non-zero amplitude coefficients.
[0082] At 325, the UE 115 may perform phase quantization based on the amplitude quantization. For example, the UE 115 may use a phase vector to quantize the non-zero phase coefficients, where the phase vector is selected or otherwise determined to achieve full utilization of the payload allocated for quantization reporting in the CSI report. The UE 115 may generate the CSI report to include the resulting amplitude quantization bits and phase quantization bits and may transmit the generated CSI report.
[0083] FIG. 4 shows an example of a process flow 400 that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure. The process flow 400 may be performed by aspects of the wireless communications system 100 or the wireless communications system 200, as described herein with reference to FIGs. 1 and 2. For example, a UE 115-b and a network entity 105-b, which may be respective examples of a UE 115 and a network entity 105 described herein, may perform aspects of the process flow 400. The UE 115-b may perform quantization (e.g., precoder quantization) , for example, in accordance with the precoder quantization 300 described with reference to FIG. 3. In the following description of the process flow 400, operations performed by the UE 115-b and the network entity 105-b may be performed in a different order than is shown. Some operations may be omitted from the process flow 400, and other operations may be added to the process flow 400. Further, although some operations or signaling may be shown to occur at different times for discussion purposes, these operations may occur at the same time. Additionally, or alternatively, other wireless devices may perform aspects of the process flow 400.
[0084] In some examples, at 405, the network entity 105-b may transmit, and the UE 115-b may receive, a CSI report configuration message. The CSI report configuration message may configure one or more aspects of CSI reporting at the UE 115-b. In some implementations, the CSI report configuration message may indicate a threshold quantity of non-zero coefficients for reporting (e.g., a value K0) . In some examples, the K0 value may be RRC-configured.
[0085] Additionally, or alternatively, in some examples, at 410, the network entity 105-b may transmit, and the UE 115-b may receive, a control message. The control message may indicate an MCS value, a resource allocation indication, or both for a CSI report. In some implementations, the control message may be an example or component of an RRC message, a MAC-CE, a DCI message, or some combination thereof.
[0086] At 415, the UE 115-b may select, or otherwise determine or calculate, a quantity of non-zero amplitude coefficients. For example, the UE 115-b may select the quantity of non-zero amplitude coefficients to report, K. In some examples, the UE 115-b may select the quantity of non-zero amplitude coefficients based on a total overhead for quantization (e.g., Ntotal) , a quantity of quantization bits associated with amplitude quantization (e.g., Qamp) , or both. Qamp may be the quantity of bits used to quantize one amplitude element (e.g., each amplitude element) . In some implementations, the UE 115-b may determine Ntotal based on the CSI report configuration message received at 405, the control message received at 410, or both. In some examples, the UE 115-b may determine Ntotal as Ntotal= (Qamp+Qphase) ×K0based on the K0 value indicated via the CSI report configuration message. In some other examples, the UE 115-b may determine Ntotal based on the allocated resources (e.g., REs) for CSI reported and the MCS value as indicated via one or more control messages.
[0087] At 420, the UE 115-b may quantize amplitude elements of one or more precoders (e.g., one or more PMIs) , channel reporting information, or both. For example, the UE 115-b may quantize the non-zero amplitude coefficients using the quantization bits associated with amplitude quantization to obtain a first set of amplitude quantization bits. The first set of amplitude quantization bits may include Namp bits, where Namp=Qamp×K.
[0088] At 425, the UE 115-b may select, or otherwise determine or calculate, a quantity of quantization bits associated with phase quantization (e.g., Qphase) . The UE 115-b may flexibly select the value of Qphase in accordance with the quantity of amplitude quantization bits, Namp, and the quantity of bits corresponding to the total overhead for quantization, Ntotal. For example, the UE 115-b may determine a quantity of phase quantization bits for reporting, Nphase, to fill the total overhead for quantization given the quantity of amplitude quantization bits. In some implementations, the UE 115-b may determine Nphase based on Nphase=Ntotal-Namp to efficiently utilize the full overhead allocated for quantization. The UE 115-b may determine the quantity of quantization bits associated with phase quantization, Qphase, based on the determined value of Nphase (and, in some examples, a quantity of non-zero phase coefficients to report, which may also be equal to K) . Accordingly, the UE 115-b may flexibly determine a method for phase quantization to satisfy the total overhead for quantization.
[0089] At 430, the UE 115-b may quantize phase elements of the one or more precoders (e.g., the one or more PMIs) , the channel reporting information, or both. For example, the UE 115-b may quantize the non-zero phase coefficients using the quantization bits associated with phase quantization to obtain a second set of phase quantization bits. The second set of phase quantization bits may include Nphase bits.
[0090] At 435, the UE 115-b may transmit, and the network entity 105-b may receive, a CSI report including the first set of amplitude quantization bits, Namp, and the second set of phase quantization bits, Nphase. The first set of amplitude quantization bits and the second set of phase quantization bits may together indicate the one or more precoders (e.g., the one or more PMIs) , the channel reporting information, or both reported by the UE 115-b. The network entity 105-b may decode the CSI report and determine the indicated precoder (s) (e.g., PMIs) , the indicated channel (s) , or both based on the amplitude quantization bits and the phase quantization bits.
[0091] At 440, the UE 115-b and the network entity 105-b may communicate signaling based on the one or more precoders (e.g., the one or more PMIs) , the channel reporting information, or both indicated by the CSI report. For example, the network entity 105-b may select a precoder for downlink transmission based on the reported one or more precoders. In some examples, the network entity 105-b may select one of the reported precoders for communications. In some other examples, the network entity 105-b may select a different precoder based on the reported precoders. Additionally, or alternatively, the network entity 105-b may select a channel or one or more channel parameters for communication based on the channel reporting information. The UE 115-b may receive downlink transmissions based on the selected precoder at the network entity 105-b, the selected channel or channel parameters at the network entity 105-b, or both.
[0092] FIG. 5 shows a block diagram 500 of a device 505 that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a transmitter 515, and a communications manager 520. The device 505, or one or more components of the device 505 (e.g., the receiver 510, the transmitter 515, the communications manager 520) , 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) .
[0093] The receiver 510 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 CSI reporting with a total bit allocation for quantization) . Information may be passed on to other components of the device 505. The receiver 510 may utilize a single antenna or a set of multiple antennas.
[0094] The transmitter 515 may provide a means for transmitting signals generated by other components of the device 505. For example, the transmitter 515 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 CSI reporting with a total bit allocation for quantization) . In some examples, the transmitter 515 may be co-located with a receiver 510 in a transceiver module. The transmitter 515 may utilize a single antenna or a set of multiple antennas.
[0095] The communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be examples of means for performing various aspects of CSI reporting with a total bit allocation for quantization as described herein. For example, the communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
[0096] In some examples, the communications manager 520, the receiver 510, the transmitter 515, 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) .
[0097] Additionally, or alternatively, the communications manager 520, the receiver 510, the transmitter 515, 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 520, the receiver 510, the transmitter 515, 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) .
[0098] In some examples, the communications manager 520 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 510, the transmitter 515, or both. For example, the communications manager 520 may receive information from the receiver 510, send information to the transmitter 515, or be integrated in combination with the receiver 510, the transmitter 515, or both to obtain information, output information, or perform various other operations as described herein.
[0099] The communications manager 520 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 520 is capable of, configured to, or operable to support a means for transmitting a CSI report that indicates one or more PMIs, channel reporting information, or both based on a total overhead for quantization, the CSI report including: a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization; and a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits. The first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits may correspond to the one or more PMIs, the channel reporting information, or both. The communications manager 520 is capable of, configured to, or operable to support a means for communicating signaling based on the one or more PMIs, the channel reporting information, or both indicated by the CSI report.
[0100] By including or configuring the communications manager 520 in accordance with examples as described herein, the device 505 (e.g., at least one processor controlling or otherwise coupled with the receiver 510, the transmitter 515, the communications manager 520, or a combination thereof) may support techniques for more efficient utilization of communication resources and improved quantization performance.
[0101] FIG. 6 shows a block diagram 600 of a device 605 that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure. The device 605 may be an example of aspects of a device 505 or a UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communications manager 620. The device 605, or one or more components of the device 605 (e.g., the receiver 610, the transmitter 615, the communications manager 620) , 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) .
[0102] The receiver 610 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 CSI reporting with a total bit allocation for quantization) . Information may be passed on to other components of the device 605. The receiver 610 may utilize a single antenna or a set of multiple antennas.
[0103] The transmitter 615 may provide a means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 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 CSI reporting with a total bit allocation for quantization) . In some examples, the transmitter 615 may be co-located with a receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.
[0104] The device 605, or various components thereof, may be an example of means for performing various aspects of CSI reporting with a total bit allocation for quantization as described herein. For example, the communications manager 620 may include a CSI reporting component 625, a precoding component 630, or both. The communications manager 620 may be an example of aspects of a communications manager 520 as described herein. In some examples, the communications manager 620, 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 610, the transmitter 615, or both. For example, the communications manager 620 may receive information from the receiver 610, send information to the transmitter 615, or be integrated in combination with the receiver 610, the transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.
[0105] The communications manager 620 may support wireless communications in accordance with examples as disclosed herein. The CSI reporting component 625 is capable of, configured to, or operable to support a means for transmitting a CSI report that indicates one or more PMIs, channel reporting information, or both based on a total overhead for quantization. The CSI report may include a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization. The CSI report may additionally include a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits. The first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits may correspond to the one or more PMIs, the channel reporting information, or both. The precoding component 630 is capable of, configured to, or operable to support a means for communicating signaling based on the one or more PMIs, the channel reporting information, or both indicated by the CSI report.
[0106] FIG. 7 shows a block diagram 700 of a communications manager 720 that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure. The communications manager 720 may be an example of aspects of a communications manager 520, a communications manager 620, or both, as described herein. The communications manager 720, or various components thereof, may be an example of means for performing various aspects of CSI reporting as described herein. For example, the communications manager 720 may include a CSI reporting component 725, a precoding component 730, a configuration component 735, a non-zero amplitude coefficient selection component 740, a phase quantization component 745, 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) .
[0107] The communications manager 720 may support wireless communications in accordance with examples as disclosed herein. The CSI reporting component 725 is capable of, configured to, or operable to support a means for transmitting a CSI report that indicates one or more PMIs, channel reporting information, or both based on a total overhead for quantization. In some examples, the CSI report may include a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization. In some such examples, the CSI report may additionally include a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits. The first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits may correspond to the one or more PMIs, the channel reporting information, or both. The precoding component 730 is capable of, configured to, or operable to support a means for communicating signaling based on the one or more PMIs, the channel reporting information, or both indicated by the CSI report.
[0108] In some examples, the configuration component 735 is capable of, configured to, or operable to support a means for receiving a CSI report configuration message that indicates a threshold quantity of non-zero coefficients for reporting, where the total overhead for quantization is based on the threshold quantity of non-zero coefficients for reporting. In some examples, the total overhead for quantization includes a third quantity of bits equal to the threshold quantity of non-zero coefficients for reporting multiplied by a sum of the second quantity of quantization bits associated with the amplitude quantization and a fourth quantity of quantization bits associated with phase quantization.
[0109] In some examples, the non-zero amplitude coefficient selection component 740 is capable of, configured to, or operable to support a means for selecting the first quantity of non-zero amplitude coefficients, where the first quantity of non-zero amplitude coefficients is different from the threshold quantity of non-zero coefficients for reporting. In some examples, the first quantity of non-zero amplitude coefficients may be greater than the threshold quantity of non-zero coefficients, equal to the threshold quantity of non-zero coefficients, or less than the threshold quantity of non-zero coefficients.
[0110] In some examples, the configuration component 735 is capable of, configured to, or operable to support a means for receiving a control message that indicates an MCS value, a resource allocation indication, or both for the CSI report, where the total overhead for quantization is based on the MCS value, the resource allocation indication, or both.
[0111] In some examples, the non-zero amplitude coefficient selection component 740 is capable of, configured to, or operable to support a means for selecting the first quantity of non-zero amplitude coefficients for the CSI report based on the total overhead for quantization, the second quantity of quantization bits associated with the amplitude quantization, or both.
[0112] In some examples, the phase quantization component 745 is capable of, configured to, or operable to support a means for selecting a third quantity of quantization bits associated with phase quantization based on the total overhead for quantization and the first set of multiple amplitude quantization bits, where the second set of multiple phase quantization bits is based on the third quantity of quantization bits associated with the phase quantization.
[0113] In some examples, a third quantity of the second set of multiple phase quantization bits is equal to a fourth quantity of bits of the total overhead for quantization minus a fifth quantity of the first set of multiple amplitude quantization bits.
[0114] FIG. 8 shows a diagram of a system 800 including a device 805 that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure. The device 805 may be an example of or include components of a device 505, a device 605, or a UE 115 as described herein. The device 805 may communicate (e.g., wirelessly) with one or more other devices (e.g., network entities 105, UEs 115, or a combination thereof) . The device 805 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 820, an input / output (I / O) controller, such as an I / O controller 810, a transceiver 815, one or more antennas 825, at least one memory 830, code 835, and at least one processor 840. 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 845) .
[0115] The I / O controller 810 may manage input and output signals for the device 805. The I / O controller 810 may also manage peripherals not integrated into the device 805. In some cases, the I / O controller 810 may represent a physical connection or port to an external peripheral. In some cases, the I / O controller 810 may utilize an operating system such as or another known operating system. Additionally, or alternatively, the I / O controller 810 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I / O controller 810 may be implemented as part of one or more processors, such as the at least one processor 840. In some cases, a user may interact with the device 805 via the I / O controller 810 or via hardware components controlled by the I / O controller 810.
[0116] In some cases, the device 805 may include a single antenna. However, in some other cases, the device 805 may have more than one antenna, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 815 may communicate bi-directionally via the one or more antennas 825 using wired or wireless links as described herein. For example, the transceiver 815 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 815 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 825 for transmission, and to demodulate packets received from the one or more antennas 825. The transceiver 815, or the transceiver 815 and one or more antennas 825, may be an example of a transmitter 515, a transmitter 615, a receiver 510, a receiver 610, or any combination thereof or component thereof, as described herein.
[0117] The at least one memory 830 may include random access memory (RAM) and read-only memory (ROM) . The at least one memory 830 may store computer-readable, computer-executable, or processor-executable code, such as the code 835. The code 835 may include instructions that, when executed by the at least one processor 840, cause the device 805 to perform various functions described herein. The code 835 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 835 may not be directly executable by the at least one processor 840 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 830 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.
[0118] The at least one processor 840 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 840 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 840. The at least one processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks supporting CSI reporting with a total bit allocation for quantization) . For example, the device 805 or a component of the device 805 may include at least one processor 840 and at least one memory 830 coupled with or to the at least one processor 840, the at least one processor 840 and the at least one memory 830 configured to perform various functions described herein.
[0119] In some examples, the at least one processor 840 may include multiple processors and the at least one memory 830 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 840 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 840) and memory circuitry (which may include the at least one memory 830) ) , 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 840 or a processing system including the at least one processor 840 may be configured to, configurable to, or operable to cause the device 805 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 835 (e.g., processor-executable code) stored in the at least one memory 830 or otherwise, to perform one or more of the functions described herein.
[0120] The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 820 is capable of, configured to, or operable to support a means for transmitting a CSI report that indicates one or more PMIs, channel reporting information, or both based on a total overhead for quantization. The CSI report may include: a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization, and a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits, the first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits corresponding to the one or more PMIs, the channel reporting information, or both. The communications manager 820 is capable of, configured to, or operable to support a means for communicating signaling based on the one or more PMIs, the channel reporting information, or both indicated by the CSI report.
[0121] By including or configuring the communications manager 820 in accordance with examples as described herein, the device 805 may support techniques for more efficient utilization of communication resources, improved coordination between devices, and improved utilization of processing capability.
[0122] In some examples, the communications manager 820 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 815, the one or more antennas 825, or any combination thereof. Although the communications manager 820 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 820 may be supported by or performed by the at least one processor 840, the at least one memory 830, the code 835, or any combination thereof. For example, the code 835 may include instructions executable by the at least one processor 840 to cause the device 805 to perform various aspects of CSI reporting with a total bit allocation for quantization as described herein, or the at least one processor 840 and the at least one memory 830 may be otherwise configured to, individually or collectively, perform or support such operations.
[0123] FIG. 9 shows a flowchart illustrating a method 900 that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure. The operations of the method 900 may be implemented by a UE or its components as described herein. For example, the operations of the method 900 may be performed by a UE 115 as described with reference to FIGs. 1 through 8. 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.
[0124] At 905, the method may include transmitting a CSI report that indicates one or more PMIs, channel reporting information, or both based on a total overhead for quantization. The CSI report may include: a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization, and a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits, the first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits corresponding to the one or more PMIs, the channel reporting information, or both. The operations of 905 may be performed in accordance with examples as disclosed herein, such as the transmission of a CSI report 220 as described with reference to FIG. 2, the transmission of a CSI report at 435 as described with reference to FIG. 4, or both. In some examples, aspects of the operations of 905 may be performed by a CSI reporting component 725 as described with reference to FIG. 7.
[0125] At 910, the method may include communicating signaling based on the one or more PMIs, the channel reporting information, or both indicated by the CSI report. The operations of 910 may be performed in accordance with examples as disclosed herein, such as communications via a downlink channel 205, an uplink channel 210, or both as described with reference to FIG. 2, the communication of signaling at 440 as described with reference to FIG. 4, or both. In some examples, aspects of the operations of 910 may be performed by a precoding component 730 as described with reference to FIG. 7.
[0126] FIG. 10 shows a flowchart illustrating a method 1000 that supports CSI reporting with a total bit allocation for quantization in accordance with one or more aspects of the present disclosure. The operations of the method 1000 may be implemented by a UE or its components as described herein. For example, the operations of the method 1000 may be performed by a UE 115 as described with reference to FIGs. 1 through 8. 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.
[0127] In some examples, at 1005, the method may include receiving a CSI report configuration message that indicates a threshold quantity of non-zero coefficients for reporting. The operations of 1005 may be performed in accordance with examples as disclosed herein, such as the reception of control information 215 as described with reference to FIG. 2, the reception of a CSI report configuration message at 405 as described with reference to FIG. 4, or both. In some examples, aspects of the operations of 1005 may be performed by a configuration component 735 as described with reference to FIG. 7.
[0128] In some examples, at 1010, the method may include receiving a control message that indicates an MCS value, a resource allocation indication, or both for the CSI report. The operations of 1010 may be performed in accordance with examples as disclosed herein, such as the reception of control information 215 as described with reference to FIG. 2, the reception of a control message at 410 as described with reference to FIG. 4, or both. In some examples, aspects of the operations of 1010 may be performed by a configuration component 735 as described with reference to FIG. 7.
[0129] At 1015, the method may include transmitting a CSI report that indicates quantized CSI (e.g., one or more PMIs, channel reporting information) based on a total overhead for quantization, where the total overhead for quantization may be based on the threshold quantity of non-zero coefficients for reporting, the MCS value, the resource allocation indication, or any combination thereof. The CSI report may include a first set of multiple amplitude quantization bits based on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization. The CSI report may further include a second set of multiple phase quantization bits based on the total overhead for quantization and the first set of multiple amplitude quantization bits. The first set of multiple amplitude quantization bits and the second set of multiple phase quantization bits may correspond to the quantized CSI (e.g., the one or more PMIs, the channel reporting information) . The operations of 1015 may be performed in accordance with examples as disclosed herein, such as the transmission of a CSI report 220 as described with reference to FIG. 2, the transmission of a CSI report at 435 as described with reference to FIG. 4, or both. In some examples, aspects of the operations of 1015 may be performed by a CSI reporting component 725 as described with reference to FIG. 7.
[0130] At 1020, the method may include communicating signaling based on the quantized CSI indicated by the CSI report. For example, the method may include communicating using a PMI based on the one or more PMIs, a channel based on the channel reporting information, or both. The operations of 1020 may be performed in accordance with examples as disclosed herein, such as communications via a downlink channel 205, an uplink channel 210, or both as described with reference to FIG. 2, the communication of signaling at 440 as described with reference to FIG. 4, or both. In some examples, aspects of the operations of 1020 may be performed by a precoding component 730 as described with reference to FIG. 7.
[0131] The following provides an overview of aspects of the present disclosure:
[0132] Aspect 1: A method for wireless communications at a UE, comprising: transmitting a CSI report that indicates one or more PMIs, channel reporting information, or both based at least in part on a total overhead for quantization, the CSI report comprising: a first plurality of amplitude quantization bits based at least in part on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization, and a second plurality of phase quantization bits based at least in part on the total overhead for quantization and the first plurality of amplitude quantization bits, the first plurality of amplitude quantization bits and the second plurality of phase quantization bits corresponding to the one or more PMIs, the channel reporting information, or both; and communicating signaling based at least in part on the one or more PMIs, the channel reporting information, or both indicated by the CSI report.
[0133] Aspect 2: The method of aspect 1, further comprising: receiving a CSI report configuration message that indicates a threshold quantity of non-zero coefficients for reporting, wherein the total overhead for quantization is based at least in part on the threshold quantity of non-zero coefficients for reporting.
[0134] Aspect 3: The method of aspect 2, wherein the total overhead for quantization comprises a third quantity of bits equal to the threshold quantity of non-zero coefficients for reporting multiplied by a sum of the second quantity of quantization bits associated with the amplitude quantization and a fourth quantity of quantization bits associated with phase quantization.
[0135] Aspect 4: The method of any of aspects 2 through 3, further comprising: selecting the first quantity of non-zero amplitude coefficients, wherein the first quantity of non-zero amplitude coefficients is different from the threshold quantity of non-zero coefficients for reporting.
[0136] Aspect 5: The method of aspect 4, wherein the first quantity of non-zero amplitude coefficients is greater than the threshold quantity of non-zero coefficients for reporting.
[0137] Aspect 6: The method of any of aspects 1 through 5, further comprising: receiving a control message that indicates an MCS value, a resource allocation indication, or both for the CSI report, wherein the total overhead for quantization is based at least in part on the MCS value, the resource allocation indication, or both.
[0138] Aspect 7: The method of any of aspects 1 through 6, further comprising: selecting the first quantity of non-zero amplitude coefficients for the CSI report based at least in part on the total overhead for quantization, the second quantity of quantization bits associated with the amplitude quantization, or both.
[0139] Aspect 8: The method of any of aspects 1 through 7, further comprising: selecting a third quantity of quantization bits associated with phase quantization based at least in part on the total overhead for quantization and the first plurality of amplitude quantization bits, wherein the second plurality of phase quantization bits is based at least in part on the third quantity of quantization bits associated with the phase quantization.
[0140] Aspect 9: The method of any of aspects 1 through 8, wherein a third quantity of the second plurality of phase quantization bits is equal to a fourth quantity of bits of the total overhead for quantization minus a fifth quantity of the first plurality of amplitude quantization bits.
[0141] Aspect 10: 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 9.
[0142] Aspect 11: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 9.
[0143] Aspect 12: 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 9.
[0144] 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.
[0145] 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.
[0146] 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.
[0147] 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 GPU, an 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.
[0148] 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.
[0149] 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.
[0150] 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. ”
[0151] 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 “a component” 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. ”
[0152] 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.
[0153] 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.
[0154] 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.
[0155] 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:transmit a channel state information report that indicates one or more precoding matrix indicators, channel reporting information, or both based at least in part on a total overhead for quantization, the channel state information report comprising:a first plurality of amplitude quantization bits based at least in part on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization, anda second plurality of phase quantization bits based at least in part on the total overhead for quantization and the first plurality of amplitude quantization bits, the first plurality of amplitude quantization bits and the second plurality of phase quantization bits corresponding to the one or more precoding matrix indicators, the channel reporting information, or both; andcommunicate signaling based at least in part on the one or more precoding matrix indicators, the channel reporting information, or both indicated by the channel state information report.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:receive a channel state information report configuration message that indicates a threshold quantity of non-zero coefficients for reporting, wherein the total overhead for quantization is based at least in part on the threshold quantity of non-zero coefficients for reporting.3.The UE of claim 2, wherein the total overhead for quantization comprises a third quantity of bits equal to the threshold quantity of non-zero coefficients for reporting multiplied by a sum of the second quantity of quantization bits associated with the amplitude quantization and a fourth quantity of quantization bits associated with phase quantization.4.The UE of claim 2, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:select the first quantity of non-zero amplitude coefficients, wherein the first quantity of non-zero amplitude coefficients is different from the threshold quantity of non-zero coefficients for reporting.5.The UE of claim 4, wherein the first quantity of non-zero amplitude coefficients is greater than the threshold quantity of non-zero coefficients for reporting.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:receive a control message that indicates a modulation and coding scheme value, a resource allocation indication, or both for the channel state information report, wherein the total overhead for quantization is based at least in part on the modulation and coding scheme value, the resource allocation indication, or both.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:select the first quantity of non-zero amplitude coefficients for the channel state information report based at least in part on the total overhead for quantization, the second quantity of quantization bits associated with the amplitude quantization, or both.8.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:select a third quantity of quantization bits associated with phase quantization based at least in part on the total overhead for quantization and the first plurality of amplitude quantization bits, wherein the second plurality of phase quantization bits is based at least in part on the third quantity of quantization bits associated with the phase quantization.9.The UE of claim 1, wherein a third quantity of the second plurality of phase quantization bits is equal to a fourth quantity of bits of the total overhead for quantization minus a fifth quantity of the first plurality of amplitude quantization bits.10.A method for wireless communications at a user equipment (UE) , comprising:transmitting a channel state information report that indicates one or more precoding matrix indicators, channel reporting information, or both based at least in part on a total overhead for quantization, the channel state information report comprising:a first plurality of amplitude quantization bits based at least in part on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization, anda second plurality of phase quantization bits based at least in part on the total overhead for quantization and the first plurality of amplitude quantization bits, the first plurality of amplitude quantization bits and the second plurality of phase quantization bits corresponding to the one or more precoding matrix indicators, the channel reporting information, or both; andcommunicating signaling based at least in part on the one or more precoding matrix indicators, the channel reporting information, or both indicated by the channel state information report.11.The method of claim 10, further comprising:receiving a channel state information report configuration message that indicates a threshold quantity of non-zero coefficients for reporting, wherein the total overhead for quantization is based at least in part on the threshold quantity of non-zero coefficients for reporting.12.The method of claim 11, wherein the total overhead for quantization comprises a third quantity of bits equal to the threshold quantity of non-zero coefficients for reporting multiplied by a sum of the second quantity of quantization bits associated with the amplitude quantization and a fourth quantity of quantization bits associated with phase quantization.13.The method of claim 11, further comprising:selecting the first quantity of non-zero amplitude coefficients, wherein the first quantity of non-zero amplitude coefficients is different from the threshold quantity of non-zero coefficients for reporting.14.The method of claim 13, wherein the first quantity of non-zero amplitude coefficients is greater than the threshold quantity of non-zero coefficients for reporting.15.The method of claim 10, further comprising:receiving a control message that indicates a modulation and coding scheme value, a resource allocation indication, or both for the channel state information report, wherein the total overhead for quantization is based at least in part on the modulation and coding scheme value, the resource allocation indication, or both.16.The method of claim 10, further comprising:selecting the first quantity of non-zero amplitude coefficients for the channel state information report based at least in part on the total overhead for quantization, the second quantity of quantization bits associated with the amplitude quantization, or both.17.The method of claim 10, further comprising:selecting a third quantity of quantization bits associated with phase quantization based at least in part on the total overhead for quantization and the first plurality of amplitude quantization bits, wherein the second plurality of phase quantization bits is based at least in part on the third quantity of quantization bits associated with the phase quantization.18.The method of claim 10, wherein a third quantity of the second plurality of phase quantization bits is equal to a fourth quantity of bits of the total overhead for quantization minus a fifth quantity of the first plurality of amplitude quantization bits.19.A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to:transmit a channel state information report that indicates one or more precoding matrix indicators, channel reporting information, or both based at least in part on a total overhead for quantization, the channel state information report comprising:a first plurality of amplitude quantization bits based at least in part on a first quantity of non-zero amplitude coefficients and a second quantity of quantization bits associated with amplitude quantization, anda second plurality of phase quantization bits based at least in part on the total overhead for quantization and the first plurality of amplitude quantization bits, the first plurality of amplitude quantization bits and the second plurality of phase quantization bits corresponding to the one or more precoding matrix indicators, the channel reporting information, or both; andcommunicate signaling based at least in part on the one or more precoding matrix indicators, the channel reporting information, or both indicated by the channel state information report.20.The non-transitory computer-readable medium of claim 19, wherein the instructions are further executable by the one or more processors to:receive a channel state information report configuration message that indicates a threshold quantity of non-zero coefficients for reporting, wherein the total overhead for quantization is based at least in part on the threshold quantity of non-zero coefficients for reporting.
Citation Information
Patent Citations
Channel state information CSI report transmission method, terminal and network side equipment
CN111836309A
Precoder matrix quantization for compressed CSI feedback
US20220085855A1
Configuring information for a channel state information report
WO2023203467A1