WO2020223837A1 - Omission de coefficients spécifiques à la couche, basée sur une indication d'ordination de couche - Google Patents

Omission de coefficients spécifiques à la couche, basée sur une indication d'ordination de couche Download PDF

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Publication number
WO2020223837A1
WO2020223837A1 PCT/CN2019/085425 CN2019085425W WO2020223837A1 WO 2020223837 A1 WO2020223837 A1 WO 2020223837A1 CN 2019085425 W CN2019085425 W CN 2019085425W WO 2020223837 A1 WO2020223837 A1 WO 2020223837A1
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Prior art keywords
layer
layers
csi report
payload
indicator
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PCT/CN2019/085425
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English (en)
Inventor
Liangming WU
Chenxi HAO
Qiaoyu Li
Chao Wei
Wanshi Chen
Yu Zhang
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Qualcomm Incorporated
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Priority to PCT/CN2019/085425 priority Critical patent/WO2020223837A1/fr
Publication of WO2020223837A1 publication Critical patent/WO2020223837A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0473—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking constraints in layer or codeword to antenna mapping into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]

Definitions

  • the following relates generally to wireless communications, and more specifically to layer specific coefficients omission.
  • 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.
  • 4G systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may be referred to as New Radio (NR) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • DFT-S-OFDM discrete Fourier transform spread orthogonal frequency division multiplexing
  • a wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • a base station may indicate for a UE to transmit a channel state information (CSI) report to identify a preferred beam for subsequent communications.
  • CSI channel state information
  • the number of subbands may be relatively large for which the UE transmits the CSI feedback, increasing overhead for the CSI feedback transmission. Efficient techniques are desired for reducing signaling overhead for a CSI feedback transmission.
  • the described techniques relate to improved methods, systems, devices, and apparatuses that support layer specific coefficients omission based on a layer ordering indication (LOI) .
  • LOI layer ordering indication
  • the described techniques provide for a user equipment (UE) to identify a LOI that indicates an order of layers from strongest to weakest (e.g., an order based on a strength metric) , omitting one or more bits from a first payload of a channel state information (CSI) report based on the LOI, and transmitting the CSI report after omitting the one or more bits from the payload.
  • the UE may identify the LOI after receiving a CSI report trigger and an uplink grant configuration indicating resources for carrying the CSI report.
  • the UE may identify that the uplink grant configuration is insufficient for carrying the payload of the CSI report and may omit the one or more bits according to the LOI based on this identification that the uplink grant configuration is insufficient to carry the CSI report payload. For example, the UE may omit the one or more bits on a priority level by priority level basis following an omission rule until the uplink grant configuration is sufficient to carry a second payload of the CSI report.
  • the UE may identify the LOI based on a configuration received from the base station and/or a fixed LOI and may report the LOI to the base station. For example, the UE may jointly encode a layer index based on the LOI with each layer in the CSI report, jointly encode a message to indicate the LOI for the layers transmitted in the CSI report, or a combination thereof.
  • the UE may also transmit at least one of: a spatial domain basis, a frequency domain basis, a first number of non-zero coefficients (NNZC) indicator indicating a total number of NNZC across a set of layers, a set of second NNZC indicators indicating the NNZC of each layer of one or more layers of the set of layers, a set of bitmaps indicating indices of NNZC of each layer of the set of layers, one or more strongest coefficient indicator of each layer of one or more layers of the set of layers, quantizations of the set of the NNZCs of each of the one or more layers, or any combination thereof.
  • the base station may identify which bits were omitted according to the omission rule by the UE in the CSI report to achieve the second payload.
  • the omission rule may be based on a priority order of the set of layers starting from a lowest priority to a highest priority. For example, the UE may omit entire layers starting with the lowest priority layers based on a supported payload size (e.g., if NNZC is reported per layer) or based on a pre-defined portion-of-omission parameter (e.g., if NNZC is reported as a total number of NNZCs) .
  • a supported payload size e.g., if NNZC is reported per layer
  • a pre-defined portion-of-omission parameter e.g., if NNZC is reported as a total number of NNZCs
  • the UE may omit portions (e.g., one coefficient at a time) of each layer starting with the lowest priority layer and proceeding to a next highest priority layer until the second payload size is achieved (e.g., until a total supported payload size is satisfied, a pre-defined portion-of-omission parameter is satisfied, etc. ) .
  • portions e.g., one coefficient at a time
  • a method of wireless communications by a UE may include receiving, from a base station, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, identifying a first payload of the CSI report and that the UL grant configuration is insufficient to carry the first payload, identifying a layer order indicator, omitting, based on the identified layer order indicator, from the first payload of the CSI report, level by level, following an omission rule, until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting, and transmitting the CSI report with the second payload after the omitting.
  • UL uplink
  • the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to receive, from a base station, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, identify a first payload of the CSI report and that the UL grant configuration is insufficient to carry the first payload, identify a layer order indicator, omit, based on the identified layer order indicator, from the first payload of the CSI report, level by level, following an omission rule, until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting, and transmit the CSI report with the second payload after the omitting.
  • UL uplink
  • the apparatus may include means for receiving, from a base station, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, identifying a first payload of the CSI report and that the UL grant configuration is insufficient to carry the first payload, identifying a layer order indicator, omitting, based on the identified layer order indicator, from the first payload of the CSI report, level by level, following an omission rule, until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting, and transmitting the CSI report with the second payload after the omitting.
  • UL uplink
  • a non-transitory computer-readable medium storing code for wireless communications by a UE is described.
  • the code may include instructions executable by a processor to receive, from a base station, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, identify a first payload of the CSI report and that the UL grant configuration is insufficient to carry the first payload, identify a layer order indicator, omit, based on the identified layer order indicator, from the first payload of the CSI report, level by level, following an omission rule, until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting, and transmit the CSI report with the second payload after the omitting.
  • UL uplink
  • identifying the layer order indicator may include operations, features, means, or instructions for identifying the layer order indicator that indicates at least an order of one layer.
  • the one layer may be a strongest layer.
  • one or more spatial domain basis In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, one or more spatial domain basis, one or more frequency domain basis, a first number of non-zero coefficients (NNZC) indicator indicating a total number of NNZC across a set of layers, a set of second NNZC indicators indicating the NNZC of each layer of one or more layers of the set of layers, a set of bitmaps indicating indices of NNZC of each layer of the set of layers, one or more strongest coefficient indicator of each layer of one or more layers of the set of layers, quantizations of the set of the NNZCs of each of the one or more layers, or any combination thereof.
  • NZC non-zero coefficients
  • the layer order indicator indicates an order of more than one layers based on a strength metric.
  • the order of more than one layers may be based on a strength metric.
  • identifying the layer order indicator may include operations, features, means, or instructions for reporting the layer order indicator that indicates a layer order; or, determining the layer order indicator based on a configuration received from the base station; or, the layer order indicator may be fixed; or, and any combination thereof.
  • the fixed layer order indicator may be based on indices of layers of the first payload of the CSI report.
  • the indices of layers may be based on a mapping order of each layer in the first payload of the CSI report, and the mapping includes mapping one or more CSI components of a layer.
  • the mapping order of each layer may be based on a strength metric.
  • reporting the layer order indicator further may include operations, features, means, or instructions for jointly encoding of a layer index based on the layer order; or, and independently encoding the layer index based on the layer order.
  • reporting the layer order indicator further may include operations, features, means, or instructions for jointly encoding a message to indicate the layer ordering indicator and a rank indicator that indicates a number of layers for a set of layers.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a priority order of a set of layers based on the layer ordering indicator, where the omission rule may be based on a priority order and the omitting from the first payload of the CSI report starts from a lowest priority to a highest priority.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the layer order indicator, a first layer may be ordered higher than a second layer and determining the first layer may have a higher priority than the second layer or the first layer may have equal priority to the second layer; or, and identifying, based on the layer order indicator, the first layer may be ordered higher than the second layer, and determining the first layer may have a lower priority than the second layer or the first layer may have equal priority to the second layer.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the layer order indicator, a first layer may be included by the layer order indicator and a second one or more layers may be precluded from the layer order indicator, and identifying the first layer may have a higher priority than the second one or more layers.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying a first layer and a second layer may be precluded from the layer order indicator, and determining respective priorities of the first layer and the second layer based on respective indices of the first layer and the second layer, respective numbers of non-zero coefficients of the first layer and the second layer, or both.
  • the respective indices of the first layer and the second layer may be based on a mapping order of each layer in the first payload of the CSI report, and the mapping includes mapping one or more CSI components of a layer.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining one or more layers with a lowest priority at a particular omission level, and determining a portion of the first payload of the CSI report to omit based on a number of non-zero coefficients of the one or more layers with the lowest priority, where the portion may be omitted from the first payload of the CSI report.
  • the number of non-zero coefficients of each of the one or more layers with the lowest priority may be determined based on a per-layer number of non-zero coefficients (NNZC) indicator in uplink control information (UCI) part 1.
  • NZC per-layer number of non-zero coefficients
  • UCI uplink control information
  • the number of non-zero coefficients of each of the one or more layers with the lowest priority may be determined based on a number of non-zero coefficients (NNZC) indicator indicating a total number of non-zero coefficients (NZC) across all layers in uplink control information (UCI) part 1.
  • NZC non-zero coefficients
  • UCI uplink control information
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a portion of the first payload of the CSI report to omit based on at least one of a number of frequency domain bases of the one or more layers with the lowest priority, or a bitmap used to indicate a number of non-zero coefficients indices of the one or more layers with the lowest priority, or a strongest coefficient indicator of the one or more layers with the lowest priority.
  • the portion of the first payload omitted at the particular omission level may be fixed or configured via RRC, medium access control control element (MAC CE) , DCI, or any combination thereof.
  • RRC radio resource control control element
  • MAC CE medium access control control element
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a configuration of a scaling factor, and determining the portion of the first payload omitted at the particular omission level based on a product of the configured scaling factor and a maximum number of non-zero coefficients reported per layer.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining one or more layers with at least a lowest priority and a second lowest priority at a particular omission level, and determining a portion of the first payload of the CSI report to omit, where the portion of the first payload of the CSI report may be omitted, layer-by-layer, from a first layer of the one or more layers with the lowest priority to a second layer of the one or more layers with the second lowest priority.
  • the portion of first payload of the CSI report to omit at the particular omission level may be fixed, configured via RRC, medium access control control element (MAC CE) , DCI, or any combination thereof.
  • MAC CE medium access control control element
  • the portion of first payload of the CSI report to omit at the particular omission level may be determined based on at least one of a number of non-zero coefficients across a set of layers, a number of non-zero coefficients of each layer of one or more layers of the set of layers, or any combination thereof.
  • a number of non-zero coefficients across a set of layers may be determined based on a total number of non-zero coefficients indicator reported in uplink control information (UCI) part 1, and a number of non-zero coefficients of each layer of one or more layers of the set of layers may be determined based on at least one of: a number of non-zero coefficients (NZC) of a layer based on a per-layer NZC indicator in UCI part 1, or based on a number of bits having a defined value in a bitmap, where the bitmap may be used to report indices of the NZCs of a corresponding layer.
  • UCI uplink control information
  • the CSI report further includes at least one of a wideband channel quality indicator (CQI) report, one or more subband CQI reports, or both, and where at least one of the wideband CQI report or the one or more subband CQI reports may be calculated based on the CSI report with the first payload.
  • CQI wideband channel quality indicator
  • the CSI report further includes at least one of a wideband CQI report or one or more subband CQI reports, and where at least one of the wideband CQI report or the one or more subband CQI reports may be calculated based on one or more layers without CSI omission in the CSI report with the second payload.
  • the CSI report further includes at least one of a wideband CQI report or one or more subband CQI reports, and where at least one of the wideband CQI report or the one or more subband CQI reports may be calculated based on a set of layers reported in the CSI report with the second payload.
  • the CSI report includes a set of quantizations of non-zero coefficients (NZCs) and the omitting includes omitting at least a subset of the set of quantizations of NZCs.
  • NZCs non-zero coefficients
  • the UL grant configuration being insufficient to carry the CSI report with the first payload further may include operations, features, means, or instructions for an allocated UL resource based on the UL grant configuration may be insufficient to carry the CSI report with the first payload, a configured coding rate may be insufficient to carry the CSI report with the first payload, or, and both.
  • a method of wireless communications by a UE may include receiving, from a base station, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, generating a CSI report based on the CSI report configuration, identifying an CSI omission indicator to the BS, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report, and transmitting the CSI report including the identified CSI omission indicator.
  • UL uplink
  • the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to receive, from a base station, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, generate a CSI report based on the CSI report configuration, identify an CSI omission indicator to the BS, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report, and transmit the CSI report including the identified CSI omission indicator.
  • the apparatus may include means for receiving, from a base station, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, generating a CSI report based on the CSI report configuration, identifying an CSI omission indicator to the BS, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report, and transmitting the CSI report including the identified CSI omission indicator.
  • a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report
  • generating a CSI report based on the CSI report configuration identifying an CSI omission indicator to the BS, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report, and transmitting the CSI report including the identified CSI omission indicator.
  • UL uplink
  • a non-transitory computer-readable medium storing code for wireless communications by a UE is described.
  • the code may include instructions executable by a processor to receive, from a base station, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, generate a CSI report based on the CSI report configuration, identify an CSI omission indicator to the BS, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report, and transmit the CSI report including the identified CSI omission indicator.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying a first payload size of the generated CSI report and identifying the UL grant configuration may be insufficient, omitting a portion of the generated CSI report and identifying a second payload size of the omitted CSI report, and transmitting the CSI report including the identified CSI omission indicator.
  • transmitting the CSI report including the identified CSI omission indicator further may include operations, features, means, or instructions for transmitting an explicit indication of the CSI omission indicator.
  • the explicit indication may be a 1-bit indicator.
  • the CSI omission indicator further may include operations, features, means, or instructions for generating an indicator jointly indicating the CSI omission indicator with other indicators.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for indicating the sufficiency of the configured FD bases, the sufficiency of the configured SD bases, or the max number of NZCs configured by the BS.
  • transmitting the CSI report including the identified CSI omission indicator further may include operations, features, means, or instructions for transmitting an RI and a per-layer NNZC, and the CSI omission indicator may be identified based on RI and per-layer NNZC.
  • the CSI omission indicator may be identified based on RI and per-layer NNZC further include identifying CSI omission whether the RI may be equal to the number of layers with non-zero coefficients based on the per-layer NNZC.
  • the CSI omission indicator further indicates which layers may be omitted based on the RI and per-layer NNZC.
  • the CSI report configuration includes at least one of a number of one or more spatial domain basis, a number of one or more frequency domain basis for one or more layers, a max number of coefficients for each of the one or more layers, a max total number of coefficients for all layers., or any combination thereof.
  • a method of wireless communications by a base station may include transmitting, to a UE, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, receiving the CSI report where the CSI report included two parts and is transmitted by the UE via a two-part UCI, identifying a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload, identifying a layer order indicator, determining that, based on the identified layer order indicator, level by level, an omission rule has been applied to the first payload of the CSI report until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting, and recovering the second part of the CSI report based on the second payload.
  • UL uplink
  • the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to transmit, to a UE, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, receive the CSI report where the CSI report included two parts and is transmitted by the UE via a two-part UCI, identify a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload, identify a layer order indicator, determine that, based on the identified layer order indicator, level by level, an omission rule has been applied to the first payload of the CSI report until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting, and recovere the second part of the CSI report based on the second payload.
  • the apparatus may include means for transmitting, to a UE, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, receiving the CSI report where the CSI report included two parts and is transmitted by the UE via a two-part UCI, identifying a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload, identifying a layer order indicator, determining that, based on the identified layer order indicator, level by level, an omission rule has been applied to the first payload of the CSI report until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting, and recovering the second part of the CSI report based on the second payload.
  • UL uplink
  • a non-transitory computer-readable medium storing code for wireless communications by a base station is described.
  • the code may include instructions executable by a processor to transmit, to a UE, a CSI report trigger and an uplink (UL) grant configuration to carry a CSI report, receive the CSI report where the CSI report included two parts and is transmitted by the UE via a two-part UCI, identify a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload, identify a layer order indicator, determine that, based on the identified layer order indicator, level by level, an omission rule has been applied to the first payload of the CSI report until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting, and recovere the second part of the CSI report based on the second payload.
  • identifying the layer order indicator may include operations, features, means, or instructions for identifying the layer order indicator that indicates at least an order of one layer.
  • the one layer may be a strongest layer.
  • one or more spatial domain basis, one or more frequency domain basis for one or more layers a first number of non-zero coefficients (NNZC) indicator indicating a total number of NNZC across a set of layers, a set of second NNZC indicators indicating the NNZC of each layer of one or more layers of the set of layers, a set of bitmaps indicating indices of NNZC of each layer of the set of layers, one or more strongest coefficient indicator of each layer of one or more layers of the set of layers, quantizations of the set of the NNZCs of each of the one or more layers, or any combination thereof.
  • NZC non-zero coefficients
  • the layer order indicator indicates an order of more than one layers.
  • the order of more than one layers may be based on a strength metric.
  • identifying the layer order indicator may include operations, features, means, or instructions for receiving a report from the UE with the layer order indicator that indicates a layer order; or, determining the layer order indicator based on a configuration configured by the base station; or, the layer order indicator may be fixed, or, and any combination thereof.
  • the fixed layer order indicator may be based on indices of layers of the first payload of the CSI report.
  • the indices of layers may be based on a mapping order of each layer in the first payload of the CSI report, and the mapping includes mapping one or more CSI components of a layer.
  • the mapping order of each layer may be based on a strength metric.
  • receiving the report may include operations, features, means, or instructions for jointly decoding of a layer index based on the layer order; or, and independently decoding the layer index based on the layer order.
  • receiving the report may include operations, features, means, or instructions for jointly decoding a message that indicates the layer ordering indicator and a rank indicator that indicates a number of layers for a set of layers.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a priority order of a set of layers based on the layer ordering indicator, where the omission rule may be based on a priority order and the omitting from the first payload of the CSI report starts from a lowest priority to a highest priority.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the layer order indicator, a first layer may be ordered higher than a second layer and determining the first layer may have a higher priority than the second layer or the first layer may have equal priority to the second layer; or, and identifying, based on the layer order indicator, the first layer may be ordered higher than the second layer, and determining the first layer may have a lower priority than the second layer or the first layer may have equal priority to the second layer.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying, based on the layer order indicator, a first layer may be included by the layer order indicator and a second one or more layers may be precluded from the layer order indicator, and identifying the first layer may have a higher priority than the second one or more layers.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying a first layer and a second layer may be precluded from the layer order indicator, and determining respective priorities of the first layer and the second layer based on respective indices of the first layer and the second layer, respective numbers of non-zero coefficients of the first layer and the second layer, or both.
  • the respective indices of the first layer and the second layer may be based on a mapping order of each layer in the first payload of the CSI report, and the mapping includes mapping one or more CSI components of a layer.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining one or more layers with a lowest priority at a particular omission level, and determining a portion of the first payload of the CSI report may have been omitted based on a number of non-zero coefficients of the one or more layers with the lowest priority, where the portion may be omitted from the first payload of the CSI report.
  • the number of non-zero coefficients of each of the one or more layers with the lowest priority may be determined based on a per-layer number of non-zero coefficients (NNZC) indicator in uplink control information (UCI) part 1.
  • NZC per-layer number of non-zero coefficients
  • UCI uplink control information
  • the number of non-zero coefficients of each of the one or more layers with the lowest priority may be determined based on a number of non-zero coefficients (NNZC) indicator indicating total number of non-zero coefficients (NZC) across all layers in uplink control information (UCI) part 1.
  • NZC non-zero coefficients
  • UCI uplink control information
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a portion of the first payload of the CSI report may have been omitted based on at least one of a number of frequency domain bases of the one or more layers with the lowest priority, or a bitmap used to indicate a number of non-zero coefficients indices of the one or more layers with the lowest priority, or a strongest coefficient indicator of the one or more layers with the lowest priority.
  • the portion of the first payload that may have been omitted at the particular omission level may be fixed or configured via RRC, medium access control control element (MAC CE) , DCI, or any combination thereof.
  • RRC radio resource control control element
  • MAC CE medium access control control element
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a configuration of a scaling factor, and determining the portion of the first payload may have been omitted at the particular omission level based on a product of the configured scaling factor and a maximum number of non-zero coefficients reported per layer.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining one or more layers with at least a lowest priority and a second lowest priority at a particular omission level, and determining a portion of the first payload of the CSI report may have been omitted, where the portion of the first payload of the CSI report may be omitted, layer-by-layer, from a first layer of the one or more layers with the lowest priority to a second layer of the one or more layers with the second lowest priority.
  • the portion of first payload of the CSI report that may have been omitted at the particular omission level may be fixed, configured via RRC, medium access control control element (MAC CE) , DCI, or any combination thereof.
  • MAC CE medium access control control element
  • the portion of first payload of the CSI report that may have been omitted at the particular omission level may be determined based on at least one of a number of non-zero coefficients across a set of layers, a number of non-zero coefficients of each layer of one or more layers of the set of layers, or any combination thereof.
  • a number of non-zero coefficients across a set of layers may be determined based on a total number of non-zero coefficients indicator reported in uplink control information (UCI) part 1, and a number of non-zero coefficients of each layer of one or more layers of the set of layers may be determined based on at least one of: a number of non-zero coefficients (NZC) of a layer based on a per-layer NZC indicator in UCI part 1, or based on a number of bits having a defined value in a bitmap, where the bitmap may be used to report indices of the NZCs of a corresponding layer.
  • UCI uplink control information
  • the CSI report further includes at least one of a wideband channel quality indicator (CQI) report, one or more subband CQI reports, or both, and where at least one of the wideband CQI report or the one or more subband CQI reports may be calculated based on the CSI report with the first payload.
  • CQI wideband channel quality indicator
  • the CSI report further includes at least one of a wideband CQI report or one or more subband CQI reports, and where at least one of the wideband CQI report or the one or more subband CQI reports may be calculated based on one or more layers without NZC CSI omission in the CSI report with the second payload.
  • the CSI report further includes at least one of a wideband CQI report or one or more subband CQI reports, and where at least one of the wideband CQI report or the one or more subband CQI reports may be calculated based on a set of layers reported in the CSI report with the second payload.
  • the CSI report includes a set of quantizations of non-zero coefficients (NZCs) and the omitting includes omitting at least a subset of the set of quantizations of NZCs.
  • NZCs non-zero coefficients
  • the UL grant configuration being insufficient to carry the CSI report with the first payload further may include operations, features, means, or instructions for an allocated UL resource based on the UL grant configuration may be insufficient to carry the CSI report with the first payload, a configured coding rate may be insufficient to carry the CSI report with the first payload, or, and both.
  • FIG. 1 illustrates an example of a system for wireless communications that supports layer specific coefficients omission based on layer ordering indication (LOI) in accordance with aspects of the present disclosure.
  • LOI layer ordering indication
  • FIG. 2 illustrates an example of a wireless communications system that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • FIGs. 3A and 3B illustrate examples of channel state information (CSI) omissions that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • CSI channel state information
  • FIG. 4 illustrates an additional example of a CSI omission that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • FIGs. 5A and 5B illustrate examples of CSI feedbacks that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • FIGs. 6A and 6B illustrate examples of layer feedbacks that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • FIG. 7 illustrates an example of uplink control information (UCI) portions that support layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • UCI uplink control information
  • FIG. 8 illustrates an example of a process flow that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • FIGs. 9 and 10 show block diagrams of devices that support layer specific coefficients omission based on layer ordering indication in accordance with aspects of the present disclosure.
  • FIG. 11 shows a block diagram of a UE communications manager that supports layer specific coefficients omission based on layer ordering indication in accordance with aspects of the present disclosure.
  • FIG. 12 shows a diagram of a system including a device that supports layer specific coefficients omission based on layer ordering indication in accordance with aspects of the present disclosure.
  • FIGs. 13 and 14 show block diagrams of devices that support layer specific coefficients omission based on layer ordering indication in accordance with aspects of the present disclosure.
  • FIG. 15 shows a block diagram of a base station communications manager that supports layer specific coefficients omission based on layer ordering indication in accordance with aspects of the present disclosure.
  • FIG. 16 shows a diagram of a system including a device that supports layer specific coefficients omission based on layer ordering indication in accordance with aspects of the present disclosure.
  • FIGs. 17 through 20 show flowcharts illustrating methods that support layer specific coefficients omission based on layer ordering indication in accordance with aspects of the present disclosure.
  • a base station may trigger a user equipment (UE) to transmit a channel state information (CSI) report (e.g., a Type II CSI feedback report) to enable the base station to identify a quality of a channel (e.g., beam) for scheduling or performing subsequent communications.
  • CSI channel state information
  • the CSI report may include a first part (e.g., with a fixed payload size) and a second part (e.g., with a dynamic payload size) , where the second part includes a number of quantized coefficients for each layer (e.g., spatial layer) of a channel.
  • the base station may indicate a maximum number of coefficients that can be reported per layer (e.g., K 0 ) for the CSI report, and the UE may report a number of non-zero coefficients (NNZC) for each layer up to the maximum number of coefficients indicated by the base station.
  • the base station may allocate a large K 0 such that the resources allocated for the CSI report (e.g., as indicated in an uplink grant configuration for the CSI report) are insufficient to carry a payload size based on K 0 .
  • the UE may omit one or more coefficients (e.g., bits) from one or more of the layers to reduce the payload size, but the base station may not be aware of which coefficients have been omitted from the CSI report.
  • the UE may identify a layer ordering indication (LOI) that indicates an order of layers from strongest to weakest (e.g., an order based on a strength metric) and indicate the LOI to the base station prior to or with the transmission of the CSI report.
  • LOI layer ordering indication
  • the UE may omit one or more coefficients from a first payload of the CSI report based on the LOI and transmit the CSI report after omitting the one or more coefficients from the payload. For example, the UE may omit the one or more bits on a level by level basis following an omission rule until the uplink grant configuration is sufficient to carry a second payload of the CSI report (e.g., a maximum supported payload for the second part of the CSI report as indicated by the base station) .
  • the UE may identify the LOI based on a configuration received from the base station and/or a fixed LOI and may report the LOI to the base station. For example, the UE may jointly encode a layer index based on the LOI with each layer in the CSI report, jointly encode a message to indicate the LOI for the layers transmitted in the CSI report, or a combination thereof.
  • the UE may also transmit at least one of: a spatial domain basis, a frequency domain basis, a first NNZC indicator indicating a total number of NNZC across a set of layers, a set of second NNZC indicators indicating the NNZC of each layer of one or more layers of the set of layers, a set of bitmaps indicating indices of NNZC of each layer of the set of layers, one or more strongest coefficient indicator of each layer of one or more layers of the set of layers, quantizations of the set of the NNZCs of each of the one or more layers, or any combination thereof.
  • the base station may identify which coefficients were omitted according to the omission rule by the UE in the CSI report to achieve the second payload.
  • the omission rule may be based on a priority order of the set of layers starting from a lowest priority to a highest priority. For example, the UE may omit entire layers starting with the lowest priority layers based on a supported payload size (e.g., if NNZC is reported per layer) or based on a pre-defined portion-of-omission parameter (e.g., if NNZC is reported as a total number of NNZCs) .
  • a supported payload size e.g., if NNZC is reported per layer
  • a pre-defined portion-of-omission parameter e.g., if NNZC is reported as a total number of NNZCs
  • the UE may omit portions (e.g., one coefficient at a time) of each layer starting with the lowest priority layer and proceeding to a next highest priority layer until the second payload size is achieved (e.g., until a total supported payload size is satisfied, a pre-defined portion-of-omission parameter is satisfied, etc. ) .
  • portions e.g., one coefficient at a time
  • aspects of the disclosure are initially described in the context of a wireless communications system. Additionally, aspects of the disclosure are illustrated through an additional wireless communications system, examples of CSI omissions, CSI feedbacks, layer feedbacks, uplink control information (UCI) portions, 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 layer specific coefficients omission based on LOI.
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the wireless communications system 100 includes base stations 105, UEs 115, and a core network 130.
  • the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • NR New Radio
  • wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low-cost and low-complexity devices.
  • ultra-reliable e.g., mission critical
  • Base stations 105 may wirelessly communicate with UEs 115 via one or more base station antennas.
  • Base stations 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a radio 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 Home NodeB, a Home eNodeB, or some other suitable terminology.
  • Wireless communications system 100 may include base stations 105 of different types (e.g., macro or small cell base stations) .
  • the UEs 115 described herein may be able to communicate with various types of base stations 105 and network equipment including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like.
  • Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 is supported. Each base station 105 may provide communication coverage for a respective geographic coverage area 110 via communication links 125, and communication links 125 between a base station 105 and a UE 115 may utilize one or more carriers. Communication links 125 shown in wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115. Downlink transmissions may also be called forward link transmissions while uplink transmissions may also be called reverse link transmissions.
  • the geographic coverage area 110 for a base station 105 may be divided into sectors making up a portion of the geographic coverage area 110, and each sector may be associated with a cell.
  • each base station 105 may provide communication coverage for a macro cell, a small cell, a hot spot, or other types of cells, or various combinations thereof.
  • a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110.
  • different geographic coverage areas 110 associated with different technologies may overlap, and overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or by different base stations 105.
  • the wireless communications system 100 may include, for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different types of base stations 105 provide coverage for various geographic coverage areas 110.
  • the term “cell” refers to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) , and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) ) operating via the same or a different carrier.
  • a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., machine-type communication (MTC) , narrowband Internet-of-Things (NB-IoT) , enhanced mobile broadband (eMBB) , or others) that may provide access for different types of devices.
  • MTC machine-type communication
  • NB-IoT narrowband Internet-of-Things
  • eMBB enhanced mobile broadband
  • the term “cell” may refer to a portion of a geographic coverage area 110 (e.g., a sector) over which the logical entity operates.
  • UEs 115 may be dispersed throughout the wireless communications system 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also 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.
  • a UE 115 may be a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer.
  • PDA personal digital assistant
  • a UE 115 may also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, or the like, which may be implemented in various articles such as appliances, vehicles, meters, or the like.
  • WLL wireless local loop
  • IoT Internet of Things
  • IoE Internet of Everything
  • MTC massive machine type communications
  • Some UEs 115 may be low cost or low complexity devices, and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication) .
  • M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station 105 without human intervention.
  • M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application program that can make use of the information or present the information to humans interacting with the program or application.
  • Some UEs 115 may be designed to collect information or enable automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
  • Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) . In some examples half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for UEs 115 include entering a power saving “deep sleep” mode when not engaging in active communications, or operating over a limited bandwidth (e.g., according to narrowband communications) . In some cases, UEs 115 may be designed to support critical functions (e.g., mission critical functions) , and a wireless communications system 100 may be configured to provide ultra-reliable communications for these functions.
  • critical functions e.g., mission critical functions
  • a UE 115 may also be able to communicate directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol) .
  • P2P peer-to-peer
  • D2D device-to-device
  • One or more of a group of UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105.
  • Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105, or be otherwise unable to receive transmissions from a base station 105.
  • groups of UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group.
  • a base station 105 facilitates the scheduling of resources for D2D communications.
  • D2D communications are carried out between UEs 115 without the involvement of a base
  • Base stations 105 may communicate with the core network 130 and with one another.
  • base stations 105 may interface with the core network 130 through backhaul links 132 (e.g., via an S1, N2, N3, or other interface) .
  • Base stations 105 may communicate with one another over backhaul links 134 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) .
  • 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) , which may include at least one mobility management entity (MME) , at least one serving gateway (S-GW) , and at least one Packet Data Network (PDN) gateway (P-GW) .
  • the MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC.
  • User IP packets may be transferred through the S-GW, which itself may be connected to the P-GW.
  • the P-GW may provide IP address allocation as well as other functions.
  • the P-GW may be connected to the network operators IP services.
  • the operators IP services may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched (PS) Stream
  • At least some of the network devices may include subcomponents such as an access network entity, which may be an example of an access node controller (ANC) .
  • Each access network entity may communicate with UEs 115 through a number of other access network transmission entities, which may be referred to as a radio head, a smart radio head, or a transmission/reception point (TRP) .
  • TRP transmission/reception point
  • various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., a base station 105) .
  • Wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band, since the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features. However, the waves may penetrate structures sufficiently for a macro cell to provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter range (e.g., less than 100 km) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • Wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band.
  • SHF region includes bands such as the 5 GHz industrial, scientific, and medical (ISM) bands, which may be used opportunistically by devices that may be capable of tolerating interference from other users.
  • ISM bands 5 GHz industrial, scientific, and medical bands
  • Wireless communications system 100 may also operate in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band.
  • EHF extremely high frequency
  • wireless communications system 100 may support millimeter wave (mmW) communications between UEs 115 and base stations 105, and EHF antennas of the respective devices may be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate use of antenna arrays within a UE 115.
  • mmW millimeter wave
  • the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. Techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
  • wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands.
  • wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz ISM band.
  • LAA License Assisted Access
  • LTE-U LTE-Unlicensed
  • NR NR technology
  • an unlicensed band such as the 5 GHz ISM band.
  • wireless devices such as base stations 105 and UEs 115 may employ listen-before-talk (LBT) procedures to ensure a frequency channel is clear before transmitting data.
  • LBT listen-before-talk
  • operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these.
  • Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD) , time division duplexing (TDD) , or a combination of both.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • base station 105 or 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.
  • wireless communications system 100 may use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115) , where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas.
  • MIMO communications may employ multipath signal propagation to increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing.
  • the multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas.
  • Each of the multiple signals may be referred to as a separate spatial stream, and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams.
  • Different spatial layers may be associated with different antenna ports used for channel measurement and reporting.
  • MIMO techniques include single-user MIMO (SU-MIMO) where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) where multiple spatial layers are transmitted to multiple devices.
  • SU-MIMO single-user MIMO
  • MU-MIMO multiple-user MIMO
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or 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 signals propagating at 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 certain amplitude and phase offsets to signals carried via each of 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) .
  • a base station 105 may use multiple antennas or antenna arrays to conduct beamforming operations for directional communications with a UE 115. For instance, some signals (e.g. synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station 105 multiple times in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different directions of transmission. Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
  • some signals e.g. synchronization signals, reference signals, beam selection signals, or other control signals
  • Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
  • Some signals may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) .
  • the beam direction associated with transmissions along a single beam direction may be determined based at least in in part on a signal that was transmitted in different beam directions.
  • a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions, and the UE 115 may report to the base station 105 an indication of the signal it received with a highest signal quality, or an otherwise acceptable signal quality.
  • a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) , or transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
  • a receiving device may try multiple receive beams when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals.
  • a receiving device may try 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 applied to signals received at a plurality of antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive beams or receive directions.
  • a receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal) .
  • the single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio, or otherwise acceptable signal quality based at least in part on listening according to multiple beam directions) .
  • the antennas of a base station 105 or UE 115 may be located within one or more antenna arrays, which may support MIMO operations, or transmit or receive beamforming.
  • one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
  • antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
  • a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
  • a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
  • wireless communications system 100 may be a packet-based network that operate according to a layered protocol stack.
  • PDCP Packet Data Convergence Protocol
  • a Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels.
  • RLC Radio Link Control
  • a Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels.
  • the MAC layer may also use hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer to improve link efficiency.
  • HARQ hybrid automatic repeat request
  • the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or core network 130 supporting radio bearers for user plane data.
  • RRC Radio Resource Control
  • transport channels may be mapped to physical channels.
  • UEs 115 and base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
  • HARQ feedback is one technique of increasing the likelihood that data is received correctly over a communication link 125.
  • 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) ) .
  • FEC forward error correction
  • ARQ automatic repeat request
  • HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise conditions) .
  • a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
  • the radio frames may be identified by a system frame number (SFN) ranging from 0 to 1023.
  • SFN system frame number
  • Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms.
  • a subframe may be further divided into 2 slots each having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods.
  • a subframe may be the smallest scheduling unit of the wireless communications system 100, and may be referred to as a transmission time interval (TTI) .
  • TTI transmission time interval
  • a smallest scheduling unit of the wireless communications system 100 may be shorter than a subframe or may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or in selected component carriers using sTTIs) .
  • a slot may further be divided into multiple mini-slots containing one or more symbols.
  • a symbol of a mini-slot or a mini-slot may be the smallest unit of scheduling.
  • Each symbol may vary in duration depending on the subcarrier spacing or frequency band of operation, for example.
  • some wireless communications systems may implement slot aggregation in which multiple slots or mini-slots are aggregated together and used for communication between a UE 115 and a base station 105.
  • carrier refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications over a communication link 125.
  • a carrier of a communication link 125 may include a portion of a radio frequency spectrum band that is operated according to physical layer channels for a given radio access technology.
  • Each physical layer channel may carry user data, control information, or other signaling.
  • a carrier may be associated with a pre-defined frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) , and may be positioned according to a channel raster for discovery by UEs 115.
  • E-UTRA evolved universal mobile telecommunication system terrestrial radio access
  • E-UTRA absolute radio frequency channel number
  • Carriers may be downlink or uplink (e.g., in an FDD mode) , or be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
  • signal waveforms transmitted over a carrier may be made up of multiple sub-carriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)) .
  • MCM multi-carrier modulation
  • OFDM orthogonal frequency division multiplexing
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • the organizational structure of the carriers may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • communications over a carrier may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling to support decoding the user data.
  • a carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc. ) and control signaling that coordinates operation for the carrier.
  • acquisition signaling e.g., synchronization signals or system information, etc.
  • control signaling that coordinates operation for the carrier.
  • a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
  • Physical channels may be multiplexed on a carrier according to various techniques.
  • a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • control information transmitted in a physical control channel may be distributed between different control regions in a cascaded manner (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces) .
  • a carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100.
  • the carrier bandwidth may be one of a number of predetermined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz) .
  • each served UE 115 may be configured for operating over portions or all of the carrier bandwidth.
  • some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
  • a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
  • a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related.
  • the number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme) .
  • the more resource elements that a UE 115 receives and the higher the order of the modulation scheme the higher the data rate may be for the UE 115.
  • a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers) , and the use of multiple spatial layers may further increase the data rate for communications with a UE 115.
  • a spatial resource e.g., spatial layers
  • Devices of the wireless communications system 100 may have a hardware configuration that supports communications over a particular carrier bandwidth, or may be configurable to support communications over one of a set of carrier bandwidths.
  • the wireless communications system 100 may include base stations 105 and/or UEs 115 that support simultaneous communications via carriers associated with more than one different carrier bandwidth.
  • Wireless communications system 100 may support communication with a UE 115 on multiple cells or carriers, a feature which may be referred to as 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 FDD and TDD component carriers.
  • wireless communications system 100 may utilize enhanced component carriers (eCCs) .
  • eCC may be characterized by one or more features including wider carrier or frequency channel bandwidth, shorter symbol duration, shorter TTI duration, or modified control channel configuration.
  • an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have a suboptimal or non-ideal backhaul link) .
  • An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum) .
  • An eCC characterized by wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are not capable of monitoring the whole carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to conserve power) .
  • an eCC may utilize a different symbol duration than other component carriers, which may include use of a reduced symbol duration as compared with symbol durations of the other component carriers.
  • a shorter symbol duration may be associated with increased spacing between adjacent subcarriers.
  • a device such as a UE 115 or base station 105, utilizing eCCs may transmit wideband signals (e.g., according to frequency channel or carrier bandwidths of 20, 40, 60, 80 MHz, etc. ) at reduced symbol durations (e.g., 16.67 microseconds) .
  • a TTI in eCC may consist of one or multiple symbol periods. In some cases, the TTI duration (that is, the number of symbol periods in a TTI) may be variable.
  • Wireless communications system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, among others.
  • the flexibility of eCC symbol duration and subcarrier spacing may allow for the use of eCC across multiple spectrums.
  • NR shared spectrum may increase spectrum utilization and spectral efficiency, specifically through dynamic vertical (e.g., across the frequency domain) and horizontal (e.g., across the time domain) sharing of resources.
  • a base station 105 may configure a UE 115 for CSI reporting, for example, by transmitting a CSI report configuration message to the UE 115.
  • the base station 105 may configure the UE 115 to report at least a Type II precoder (e.g., for a Type II CSI feedback report) across configured frequency domain (FD) units.
  • a precoder for a certain layer l on N 3 subbands may be expressed as a size-P ⁇ N 3 matrix W l :
  • the SD bases may be discrete Fourier transform (DFT) -based, and the SD basis with index and may be written as
  • N 1 and N 2 may represent a first and second dimension of a configured codebook, respectively, for the Type II precoder.
  • N 1 and N 2 may refer to a number of antenna elements on vertical and horizontal dimensions at the base station 105, respectively.
  • An oversampling factor may be denoted by O 1 and O 2 .
  • ...M l may be a N 3 ⁇ 1 FD basis (i.e., is a 1 ⁇ N 3 row vector) which may also be known as the transferred domain basis.
  • M l may represent a number of FD bases selected for layer l and it is derived based on RRC configuration. In some cases, for each layer of rank-1 and rank-2, there may be M bases, and the value of may be determined by a ratio p configured by RRC signaling. Additionally, R may represent the number of precoding matrix indicator (PMI) subbands within one channel quality indicator (CQI) subband.
  • PMI precoding matrix indicator
  • CQI channel quality indicator
  • the FD bases may be DFT bases, and the FD basis with index may be expressed as:
  • linear combination coefficients for the CSI report from the UE 115 may include three parts (i.e., ) .
  • the parameter may represent an amplitude reference for the first polarization, while may represent an amplitude reference for the second polarization. and may be common to all coefficients associated with the corresponding polarization (i.e., and ) .
  • the parameter may represent a (differential) amplitude for a coefficient associated with the SD basis with index and and associated with the FD basis with index in the first polarization, while may represent a (differential) amplitude for a coefficient associated with SD basis with index and and associated with the FD basis with index in the second polarization.
  • the parameter may represent a (differential) amplitude for a coefficient associated with SD basis with index and and associated with the FD basis with index in the first polarization, while may represent a (differential) amplitude for a coefficient associated with SD basis with index and and associated with the FD basis with index in the second polarization.
  • the UE 115 may report at most K 0 coefficients, while the unreported coefficients are set to zeros. The value of is derived based on an RRC configuration of ⁇ (e.g., as indicated by the base station 105) .
  • the UE 115 may report at most 2 ⁇ K 0 coefficients across all layers, such that a maximum payload for rank-3 and rank-4 may be comparable to a maximum payload of rank-2 (e.g., and/or rank-1) .
  • the rank may indicate a number of layers to be used for downlink transmissions (e.g., based on the antenna ports of the UE 115) .
  • the rank may indicate, for example, which transmission resources the base station 105 should preferably use for downlink transmissions to the UE 115 in subsequent communications.
  • the rank may include a channel state information resource indicator (CRI) .
  • the UE 115 may indicate the rank via a rank indication (RI) included in the CSI report.
  • the UE 115 may report CSI components CQI (wideband and/or subband) , RI, an NNZC (per-layer or total NNZC across all layers) in a first uplink control information (UCI) part (e.g., UCI part 1) of the CSI report.
  • CQI wideband and/or subband
  • RI resource indicator
  • NNZC per-layer or total NNZC across all layers
  • These CSI components may determine the payload of a second UCI part (e.g., UCI part 2) , which includes CSI components SD bases (common to all layers) , FD bases (layer-specific) , a bitmap used to indicate non-zero coefficient (NZC) indices (layer-specific) , a strongest coefficient indicator (layer-specific) , and a quantization of NZCs (layer-specific) .
  • UCI part 2 may be as a large as 500 ⁇ 800 bits (e.g., based on K 0 for each layer) .
  • a CSI omission rule may be needed. Since FD compression may be applied in the Type II precoder codebook, a subband-based compression may not be possible since each CSI component may be correlated to a same precoding matrix index (PMI) on all subbands. Accordingly, a possible CSI omission rule may include to omit coefficients layer-by-layer, such that the UE 115 may be able to report some complete layers. Additionally, if some layers are omitted, the UE 115 may not update the CQI computation because the CQI computed using a higher rank would be underestimated for a low rank.
  • PMI precoding matrix index
  • a layer-indicator may be reported by a UE 115 to indicate which layer among all layers is a strongest layer, where the strongest layer may include a phase tracking reference signal (PTRS) associated with the strongest layer.
  • This LI indicator may include a reporting. That is, if the UE 115 is configured to report at most rank RI max , then the UE 115 may indicate which layer is the strongest (e.g., rather than indicating an order of the all ranks) .
  • this LI may be reused and extended to determine a priority rule for CSI omission. An example of the priority rule and priority order of the different priority levels may be shown below in Table 1.
  • Priority 0 (highest) wideband CSI of CSI report 0 to CSI N rep -1
  • Priority 1 layer associated with LI of CSI report 0
  • Priority 2 layer (s) not associated with LI of CSI report 0
  • Priority 3 layer associated with LI of CSI report 1
  • Priority 4 layer (s) not associated with LI of CSI report 1 ... ...
  • Priority 2N rep -1 layer associated with LI of CSI report N rep -1
  • Priority 2N rep (lowest) layer (s) not associated with LI of CSI report N rep -1
  • the strongest layer indicated by the LI may have a higher priority than the other layers.
  • their priority order may depend on their index.
  • the CSI omission starts from the lowest priority and proceeds to the highest priority until a payload size of the UCI part 2 is below a maximum supported UCI part 2 payload size (e.g., as indicated by the base station 105.
  • the UE 115 may transmit the CSI report with layer 1 with NNZC K NZ, 1 . If the allocated uplink resources are still insufficient to transmit after omitting the CSIs for layers 0, 2 and 3, then the UE 115 may further omit layer 1 and transmit no UCI part 2 for this CSI report.
  • the base station 105 may first decode the UCI Part 1 message and recover the per-layer NNZC indicator K NZ, 0 , K NZ, 1 , K NZ, 2 and K NZ, 3 . Then, based on this information, the base station may determine a first payload of the UCI Part 2 message and check whether the first payload can be carried by the allocated uplink resources at the target coding rate. If the allocated uplink resource is insufficient to carry the CSI report, the base station 105 may identify that a CSI omission has occurred.
  • the base station 105 may first check whether the allocated uplink resource is sufficient to carry the CSI report by omitting layers 0, 2 and 3. If the allocated uplink resource is insufficient, the base station 105 may assume there is no UCI part 2 for this CSI report.
  • the CSI omission at a certain level may include omitting the FD basis and bitmap used to report NZC indices and the strongest coefficient indices of the corresponding layer (s) .
  • the UE may calculate a CQI (and a BS may assume CQI is calculated) based on the CSI before omission.
  • the CQI is calculated based on a PMI which has a rank no less than the reported PMI and the PMI used in CQI calculation contains the layers included in the reported PMI. Additionally or alternatively, the UE may calculate the CQI (and a BS may assume the CQI) based on the layers without omission. That is, the CQI is calculated based on some layers in the reported PMI, where there is no CSI omission to these layers. In some cases, the base station 105 may calculate the CQI based on all the layers after omission.
  • the UE 115 may be limited with how to reduce the payload size or may omit layers inefficiently. For example, the UE 115 may omit a second strongest layer or a second highest priority layer based on a layer index number before omitting lower priority layers to achieve the supported priority layers. In other conventional implementations, the UE 115 may omit certain parts of the payload (e.g., a CSI omission discard) based on a predefined rule.
  • the UE 115 may omit coefficients (e.g., CSI report portions) based on even or odd subband groups (e.g., all even subband groups or odd subband groups may be omitted) .
  • the UE 115 may omit layers irrespective of a priority (e.g., except for a strongest layer containing the PTRS) until a payload size is reached. Accordingly, more efficient techniques are desired for indicating an order of reported layers for omission purposes.
  • Wireless communications system 100 may support efficient techniques for a UE 115 to identify an LOI that indicates an order of layers from strongest to weakest (e.g., an order based on a strength metric) and indicate the LOI to a base station 105 prior to or with the transmission of a CSI report.
  • the UE 115 may omit one or more coefficients from a first payload of the CSI report based on the LOI and transmit the CSI report after omitting the one or more coefficients from the payload.
  • the UE 115 may omit the one or more bits on a level by level basis following an omission rule until the uplink grant configuration is sufficient to carry a second payload of the CSI report (e.g., a maximum supported payload for the second part of the CSI report as indicated by the base station 105) .
  • the UE 115 may identify the LOI based on a configuration received from the base station 105 and/or a fixed LOI and may report the LOI to the base station 105. Based on the LOI (and additional parameters) , the base station 105 may identify which coefficients were omitted according to the omission rule by the UE 115 in the CSI report to achieve the second payload.
  • the UE 115 may omit entire layers starting with the lowest priority layers based on a supported payload size (e.g., if NNZC is reported per layer) or based on a pre-defined portion-of-omission parameter (e.g., if NNZC is reported as a total number of NNZCs) . Additionally or alternatively, the UE 115 may omit portions (e.g., one coefficient at a time) of each layer starting with the lowest priority layer and proceeding to a next highest priority layer until the second payload size is achieved (e.g., until a total supported payload size is satisfied, a pre-defined portion-of-omission parameter is satisfied, etc. ) .
  • a supported payload size e.g., if NNZC is reported per layer
  • a pre-defined portion-of-omission parameter e.g., if NNZC is reported as a total number of NNZCs
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • wireless communications system 200 may implement aspects of wireless communications system 100.
  • Wireless communications system 200 may include a base station 105-a and a UE 115-a, which may be examples of corresponding base stations 105 and UEs 115, respectively, as described above with reference to FIG. 1.
  • UE 115-a and base station 105-a may communicate on resources of a carrier 205. Additionally, while not shown, the communications on carrier 205 may be performed via beamformed transmissions as described above with reference to FIG. 1.
  • base station 105-a may transmit a CSI trigger 210 to indicate to UE 115-a to transmit a CSI report 230.
  • the CSI report 230 may enable base station 105-a to identify information about carrier 205 (e.g., a channel, a beam, etc. ) for determining parameters for subsequent communications with UE 115-a (e.g., selecting a new beam, adjusting transmission power, etc. ) .
  • base station 105-a may transmit an uplink grant indicating a resource allocation (e.g., and additional transmission parameters) for UE 115-a to transmit CSI report 230.
  • a resource allocation e.g., and additional transmission parameters
  • UE 115-a may identify that the resource allocation is insufficient for transmitting a first payload size of CSI report 230 based on a configured number of K 0 coefficients that can be transmitted for each layer in CSI report 230. For example, base station 105-a may allocate a large K 0 , which results in a large size for the first payload size, but the actual resource allocation (e.g., a physical uplink shared channel (PUSCH) ) may be insufficient to carry the first payload size.
  • PUSCH physical uplink shared channel
  • UE 115-a may perform an LOI identification 215 to identify an order of reported layers in CSI report 230 for a given rank and then perform a CSI omission 220 to omit coefficients of CSIs per layer based on an LOI 225.
  • LOI 225 may indicate a layer ordering for a Type II CSI report for CSI report 230 and may provide an implementation for UE 115-a to omit parts of CSI report 230 based on layer ordering as indicated by LOI 225.
  • UE 115-a may transmit LOI 225 to base station 105-a in a first part (e.g., UCI part 1, part-1, etc. ) of CSI report 230, indicating the ordering of reported layers in a second part (e.g., UCI part 2, part-2, etc. ) of CSI report 230.
  • a first part e.g., UCI part 1, part-1, etc.
  • a second part e.g., UCI part 2, part-2, etc.
  • the possible orderings of the layers may include (1, 2, 3) , (1, 3, 2) , (2, 1, 3) , (2, 3, 1) , (3, 1, 2) , and (3, 2, 1) for layers 1, 2, and 3.
  • LOI 225 may be configured to be included (e.g., in the first part of CSI report 230, the second part CSI report 230, etc. ) or not included with CSI report 230 (e.g., in a separate transmission to base station 105-a, a fixed value, etc. ) .
  • LOI 225 may indicate the ordering of different layers per rank. For a rank R, the total number of hypotheses (e.g., possible layer orderings) may be given as Additionally, a number of payload bits for LOI 225 with rank R may be given as with layers i. In some cases, UE 115-a may jointly encode LOI 225 with a RI in CSI report 230 or may individually encode LOI 225 in a separate uplink transmission.
  • UE 115-a may perform CSI omission 220 on one or more layers of CSI report 230, where CSI report 230 includes the second part (e.g., UCI part 2, part-2 CSI, etc. ) containing channel information of multiple layers. In some cases, lower ordered or indexed layers may be considered with lower priority and omitted first. Additionally, in LOI 225, UE 115-a may report NNZCs per layer or may report NNZC as a total number of NZCs for all layers.
  • the second part e.g., UCI part 2, part-2 CSI, etc.
  • UE 115-a may omit coefficients in CSI report 230 until an overhead of the second part satisfies an overhead requirement.
  • the overhead requirement may be a defined (e.g., maximum) supported payload for the second part of CSI report 230 (e.g., a part-2 UCI payload) .
  • a defined (e.g., maximum) supported payload for the second part of CSI report 230 e.g., a part-2 UCI payload
  • UE 115-a may omit (e.g., discard) layer 3 first.
  • UE 115-a may stop CSI omission 220 and report the remaining layer 1 and layer 2 channel information (e.g., coefficients) in CSI report 230. If the overhead requirement is not met, UE 115-a may omit layer 1 and layer 2 in consecutive order (e.g., omit layer 1 next and then layer 2 after) based on LOI 225 of (2, 1, 3) until the overhead requirement is met.
  • base station 105-a may configure a pre-defined portion-of-omission parameter, ⁇ , along with CSI trigger 210 (e.g., a CSI report configuration) .
  • ⁇ may be etc.
  • UE 115-a may omit coefficients for CSI of layers based on LOI 225 and ⁇ . For example, UE 115-a may omit layers consecutively based on the order indicated in LOI 225 until (NNZC ⁇ ⁇ ) omitted coefficients are collected.
  • UE 115-a may omit layers consecutively based on the order indicated in LOI 225 until or omitted coefficients are collected (e.g., based on the rank/number of layers, where K 0 is used for rank-1 or rank-2 and 2K 0 is used for ranks higher than rank-2) .
  • NNZC may represent a dynamic value reported by the UE, while K 0 may represent a pre-defined (e.g., static, configured, etc. ) value.
  • UE 115-a may omit one coefficient from a lowest priority layer, then a second coefficient from the next priority layer, etc., until the overhead requirement is met. For example, UE 115-a may omit one coefficient at a time from a lowest priority layer up to the highest priority layer (e.g., as indicated in LOI 225) , thereby omitting portions of a CSI for each layer rather than omitting all coefficients of each layer.
  • UE 115-a may omit the portions of each layer based on whether NNZCs are reported per layer or reported as a total number of NZCs for all layers as described above. For example, UE 115-a may omit coefficients on each layer until a total payload size (e.g., a second payload) of CSI report 230 meets the overhead requirement (e.g., part-2 CSI payload requirement) if NNZCs are reported per layer. Additionally or alternatively, if NNZCs are reported as a total number of NZCs for all layers, UE 115-a may omit coefficients on each layer until or omitted coefficients are collected as described above.
  • a total payload size e.g., a second payload
  • the overhead requirement e.g., part-2 CSI payload requirement
  • the LI as described above with reference to FIG. 1 may be extended to LOI 225.
  • UE 115-a may report LOI 225 to indicate an order of reported layers in CSI report 230 based on the strength of the layers.
  • the bitwidth (e.g., number of payload bits) of LOI 225 may be given as or if transmitted in the first part of CSI report 230 (e.g., UCI part 1) .
  • the bitwidth of LOI 225 may be given as or if LOI 225 is transmitted in the second part of CSI report 230 (e.g., UCI part 2) .
  • UE 115-a may use LOI 225 to determine a priority rule for CSI omission.
  • An example of the priority rule and a priority order for different priority levels may be indicated by Table 2 below.
  • Priority 0 (highest) wideband CSI of CSI report 0 to CSI N rep -1
  • Priority 1 strongest layer of CSI report 0
  • Priority 2 second strongest layer (if applied) of CSI report 0
  • Priority 3 second weaker layer (if applied) of CSI report 0
  • Priority 4 weakest layer (if applied) of CSI report 0 ... ...
  • Priority 4N rep -3 strongest layer of CSI report N rep -1
  • Priority 4N rep -2 second strongest layer (if applied) of CSI report N rep -1
  • Priority 4N rep -1 second weakest (if applied) layer of CSI report N rep -1
  • Priority 4N rep (lowest) weakest layer (if applied) of CSI report N rep -1
  • a stronger layer indicated by LOI 225 may have a higher priority than a weaker layer indicated by LOI 225.
  • UE 115-a may use a CSI omission rule for CSI omission 220 to configure a CSI payload based on omitting CSI (e.g., coefficients) at a particular level as indicated in Table 2, where CSI omission 220 starts from the lowest priority.
  • CSI e.g., coefficients
  • UE 115-a may first omit layer 2. If the payload after omission can be transmitted via allocated uplink resources (e.g., a resource allocation as indicated with CSI trigger 210) with a targeted coding rate, then UE 115-a transmits CSI report 230 with channel information (e.g., coefficients) for layers 1, 0 and 3. Additionally or alternatively, if the allocated uplink resources are still insufficient to transmit CSI report 230 with the omitted coefficients (e.g., CSI) , then UE 115-a may further omit layer 3 and transmit layers 1 and 0 for CSI report 230.
  • allocated uplink resources e.g., a resource allocation as indicated with CSI trigger 210
  • channel information e.g., coefficients
  • base station 105-a may first decode the first part of CSI report 230 (e.g., UCI Part 1 message) and recover the per-layer NNZC indicator K NZ, 0 , K NZ, 1 , K NZ, 2 and K NZ, 3 . Then based on this information, base station 105-a may determine a first payload of the second part of CSI report 230 (e.g., UCI Part 2 message) and check whether the first payload can be carried by the allocated uplink resources with the target coding rate. If the allocated uplink resource is insufficient to carry CSI report 230, base station 105-a may determine CSI omission 220 has occurred.
  • the first part of CSI report 230 e.g., UCI Part 1 message
  • base station 105-a may determine a first payload of the second part of CSI report 230 (e.g., UCI Part 2 message) and check whether the first payload can be carried by the allocated uplink resources with the target coding rate. If
  • base station 105-a may first check whether the allocated uplink resource is sufficient to carry CSI report 230 with layers 1, 0 and 3 by omitting layer 2. If not, base station 105-a may assume layers 0 and 1 are included in CSI report 230 (e.g., with layers 2 and 3 omitted) . Accordingly, the omission at a certain level may include omitting the FD basis and bitmap used to report NZC indices and strongest coefficient indices of the corresponding layer (s) (e.g., layers 2 and 3) .
  • the UE may calculate a CQI (and a BS may assume CQI is calculated) based on the CSI before omission. That is, the CQI is calculated based on a PMI which has a rank no less than the reported PMI and the PMI used in CQI calculation contains the layers included in the reported PMI. Additionally or alternatively, the UE may calculate the CQI (and a BS may assume the CQI) based on the layers without omission. That is, the CQI is calculated based on some layers in the reported PMI, where there is no CSI omission to these layers. In some cases, the base station 105 may calculate the CQI based on all the layers after omission.
  • UE 115-a may report a total NNZC across all layers in the first part of CSI report 230 (e.g., UCI Part 1 message) , indicating that there are NZCs across all reported layers.
  • UE 115-a may report a portion of the total NNZC (e.g., half of the total NNZC) at a certain level (e.g., based on ⁇ as described above) .
  • CSI omission 220 may start from the layers with the lower priority as determined based on LOI 225.
  • CSI omission 220 e.g., a CSI omission rule
  • coefficients e.g., CSI payload
  • UE 115-a may first omit all 10 coefficients in layer 2 and 12 coefficients in layer 3. If the payload after CSI omission 220 can be transmitted via the allocated uplink resources with the targeted coding rate, then UE 115-a may transmit CSI report 230 with all coefficients for layer 1 and 0 and may transmit 3 coefficients for layer 3.
  • UE 115-a may further omit coefficients in the second part of CSI report 230 (e.g., UCI part 2) until the allocated uplink resources are sufficient (e.g., overhead requirement is met) .
  • base station 105-a may first decode the first part of CSI report 230 (e.g., UCI Part 1 message) and recover the total NNZC is equal to 44 coefficients. Then based on this information, base station 105-a may determine a first payload of the second part of CSI report 230 (e.g., UCI Part 2 message) and check whether the first payload can be carried by the allocated uplink resource with the target coding rate. If the allocated uplink resource is insufficient to carry CSI report 230, base station 105-a may determine CSI omission 220 has occurred. Base station 105-a may first check whether the allocated uplink resource is sufficient to carry NZCs (e.g., based on ) .
  • NZCs e.g., based on
  • base station 105-a may further check whether the allocated uplink resource is sufficient to carry CSI report 230 by further omitting another portion, etc. If so, base station 105-a may decode the second part of CSI report 230 (e.g., UCI) .
  • SCI strongest coefficient indicator
  • base station 105-a may first check whether the allocated uplink resource is sufficient to carry CSI report 230 with all coefficients for layer 1 and 0 and with 3 coefficients for layer 3. In some cases, base station 105-a may base a CQI calculation on the CSI before omission, on the layers without omission, or on all the layers after omission.
  • CSI omission comprises omitting a portion (e.g., 50%) of entire UCI part 2.
  • the omission may starts layer by layer, indexed based on the LOI.
  • the CSI omitted at a certain level is as in Table 4.
  • UE may know there are 120 bits for layer 0, 141 bits for layer 1, 134 bits for layer 2 and 169 bits for layer 3 (plus 11 bits for SD bases common to all layers) , Then UE may omit 288 bits from UCI part 2. The UE may omit all 134 bits for layer 2, and 154 (from the 169 bits) of layer 3.
  • the BS knows the a first payload for UCI part 2, and a first payload of each layer. Then, BS knows there are 288 bits to be omitted as the UL resource is not sufficient to carry all the 575 bits.
  • the BS knows 134 bits for layer 2, and 154 (from the 169 bits) of layer 3 are omitted.
  • the exact omitted CSI component is known by the mapping order.
  • the UE may calculate a CQI (and a BS may assume CQI is calculated) based on the CSI before omission. That is, the CQI is calculated based on a PMI which has a rank no less than the reported PMI and the PMI used in CQI calculation contains the layers included in the reported PMI. Additionally or alternatively, the UE may calculate the CQI (and a BS may assume the CQI) based on the layers without omission. That is, the CQI is calculated based on some layers in the reported PMI, where there is no CSI omission to these layers. In some cases, the base station 105 may calculate the CQI based on all the layers after omission.
  • LI may be extended to LOI 225 as described above, where LOI 225 includes two (2) layers. Accordingly, LOI 225 may be reported by UE 115-a to indicate the indices of the strongest layer and the second strongest layer.
  • the bitwidth of this LOI 225 may be given by or if transmitted in the first part of CSI report 230 (e.g., UCI part 1) . may represent a joint encoding of the ordering, while may represent an independent encoding of the layer index at a certain order. Additionally or alternatively, the bitwidth of LOI 225 may be given by or if transmitted in the second part of CSI report 230 (e.g., UCI part 2) . Then, LOI 225 may be used to determine the priority rule for CSI omission 220.
  • An example of a priority order may be given by Table 4 below.
  • Priority 0 (highest) wideband CSI of CSI report 0 to CSI N rep -1
  • Priority 1 strongest layer of CSI report 0
  • Priority 2 second strongest layer (if applied) of CSI report 0
  • Priority 3 other layers (if applied) of CSI report 0 ... ...
  • Priority 3N rep -2 strongest layer of CSI report N rep -1
  • Priority 3N rep -1 second strongest layer (if applied) of CSI report N rep -1
  • Priority 3N rep (lowest) other layers (if applied) of CSI report N rep -1
  • a stronger layer indicated by LOI 225 may have a higher priority than a weaker layer indicated by LOI 225.
  • CSI omission 220 e.g., CSI omission rule
  • the CSI payload to be omitted at a particular level given by Table 4, where CSI omission 220 starts from the lowest priority.
  • the priority orders of the layers not indicated by the LOI may depend on their indices.
  • UE 115-a may first omit layer 2 and 3 if needed. If the payload before omission can be transmitted via the allocated uplink resource with the targeted coding rate, then UE 115-a may transmit CSI report 230 with layer 1 and 0. If the allocated uplink resource is insufficient to transmit the omitted CSI report 230, then UE 115-a may omit layer 0 and transmit layer 1 for CSI report 230.
  • base station 105-a may first decode the first part of CSI report 230 (e.g., UCI Part 1 message) and recover the per-layer NNZC indicator K NZ, 0 , K NZ, 1 , K NZ, 2 . and K NZ, 3 . Then based on this information, base station 105-a may determine a first payload of the second part of CSI report 230 (e.g., UCI Part 2 message) and check whether the first payload can be carried by the allocated uplink resources with the target coding rate. If the allocated uplink resources are insufficient to carry the report, base station 105-a may determine CSI omission 220 has occurred.
  • the first payload of the second part of CSI report 230 e.g., UCI Part 2 message
  • base station 105-a may first check whether the allocated uplink resources are sufficient to carry CSI report 230 by omitting layer 0. If not, base station 105-a may assume only layer 1 is in CSI report 230. In this case, the omission at a certain level may include omitting the FD basis and bitmap used to report NZC indices and strongest coefficient indices of the corresponding layer (s) . In some cases, the UE may calculate a CQI (and a BS may assume CQI is calculated) based on the CSI before omission.
  • the CQI is calculated based on a PMI which has a rank no less than the reported PMI and the PMI used in CQI calculation contains the layers included in the reported PMI. Additionally or alternatively, the UE may calculate the CQI (and a BS may assume the CQI) based on the layers without omission. That is, the CQI is calculated based on some layers in the reported PMI, where there is no CSI omission to these layers. In some cases, the base station 105 may calculate the CQI based on all the layers after omission.
  • the layers are ordered based on their indices. That is, the layer order is based on their mapping order in the UCI part 2. In some examples, the layers mapped in an order following their strength. The strongest layer would be put into the UCI part 2 first, followed by the second strongest layer, third, fourth, etc. Hence, layer 0 would be the strongest layer, layer 1 is the second strongest, etc. Then, all the aforementioned can be applied by determining the priority of each layer based on their indices. That is, table 1-4 can be reformulated as
  • Priority 0 (highest) wideband CSI of CSI report 0 to CSI N rep -1
  • Priority 1 layer 0 of CSI report 0
  • Priority 2 of CSI report 0
  • Priority 3 layer 0 of CSI report 1
  • Priority 4 layer (s) other than layer 0 of CSI report 1 ... ...
  • Priority 2N rep -1 layer 0 of CSI report N rep -1
  • Priority 2N rep (lowest) layer (s) other than layer 0 of CSI report N rep -1
  • Priority 0 (highest) wideband CSI of CSI report 0 to CSI N rep -1
  • Priority 1 layer 0 of CSI report 0
  • Priority 2 layer 1 (if applied) of CSI report 0
  • Priority 3 layer 2 (if applied) of CSI report 0
  • Priority 4 layer 3 (if applied) of CSI report 0 ... ...
  • Priority 4N rep -3 layer 0 of CSI report N rep -1
  • Priority 4N rep -2 layer 1 (if applied) of CSI report N rep -1
  • Priority 4N rep -1 layer 2 (if applied) layer of CSI report N rep -1
  • Priority 4N rep (lowest) layer 3 (if applied) of CSI report N rep -1
  • Priority 0 (highest) wideband CSI of CSI report 0 to CSI N rep -1
  • Priority 1 layer 0 of CSI report 0
  • Priority 2 layer 1 (if applied) of CSI report 0
  • Priority 3 layer 2 and 3 (if applied) of CSI report 0 ... ...
  • Priority 3N rep -2 layer 0 of CSI report N rep -1
  • Priority 3N rep -1 layer 1 (if applied) of CSI report N rep -1
  • Priority 3N rep (lowest) layer 2 and 3 (if applied) of CSI report N rep -1
  • UE may report total NNZC and mapping the CSI components into UCI part 2 following the order all components (FD basis, bitmap for reporting coefficients indices, SCI and quantization of NZCs) of layer 0, all components of layer 1, all components or layer 2 and all components of layer 3. Based on this order, the UE starts omission from the layer with highest indices until half of the UCI part 2 is omitted to meet the omission rule at a particular level shown in Table 9.
  • all components FD basis, bitmap for reporting coefficients indices, SCI and quantization of NZCs
  • the UE may determine there are totally 575 bits in UCI part 2 (payload for other components, SD basis, FD bases, bitmap to indicate coefficients indices and SCI are fixed) . Then UE may omit 288 bits from UCI part 2. Assuming there are 134 bits for layer 3 and 169 bits for layer 2, the UE may omit all 134 bits for layer 3, and 154 (from the 169 bits) of layer 3. At the BS side, based on the reported total NNZC across all layers, the BS knows the a first payload for UCI part 2.
  • BS knows there are 288 bits to be omitted as the UL resource is not sufficient to carry all the 575 bits. Then, following the rule the BS knows 134 bits for layer 3, and 154 (from the 169 bits) of layer 2 are omitted. The exact omitted CSI component is known by the mapping order.
  • the UE may calculate a CQI (and a BS may assume CQI is calculated) based on the CSI before omission. That is, the CQI is calculated based on a PMI which has a rank no less than the reported PMI and the PMI used in CQI calculation contains the layers included in the reported PMI. Additionally or alternatively, the UE may calculate the CQI (and a BS may assume the CQI) based on the layers without omission. That is, the CQI is calculated based on some layers in the reported PMI, where there is no CSI omission to these layers. In some cases, the base station 105 may calculate the CQI based on all the layers after omission.
  • CSI omission 220 may first omit a portion (e.g., a half) of the payload (e.g., NNZC) of each layer. If the allocated uplink resource is insufficient to carry CSI report 230, then UE 115-a may omit a second portion of the payload of each layer, until the allocated uplink resource is sufficient to carry CSI report 230 after omission.
  • a portion e.g., a half
  • the payload e.g., NNZC
  • the CSI omission process is up to UE implementation, and made transparent to BS. That is, after CSI calculation, the UE knows a first payload of the CSI and knows that the UL resource is insufficient to carry a first payload. Then, the UE omits all the CSI components of some layers to have a second payload of UCI part 2, and updates RI/NNZC in UCI part 1 so that the UCI part 1 indicates the second payload of UCI part 2. Then, from BS perspective, the BS station does not know CSI omission has occurred, the BS only recovers the UCI part 2 following what UCI part 1 indicates.
  • the BS may obtain a low rank reported by UE, but not be aware of this is because of CSI omission or UE preference.
  • additional signaling needs to be sent in UCI part 1.
  • the additional signaling may be termed as “CSI omission indicator (COI) ” or “status indication” (SI) .
  • the COI may be a 1-bit indication to indicate that the reported CSI is after CSI omission.
  • the SI may be generated by joint encoding COI with other indicators, such as basis sufficiency indicator.
  • the basis sufficiency indicator indicates whether the number of configured FD bases are sufficient to capture the actual channel state and interference measurement.
  • the BSI further comprises indicating whether the configured SD bases are sufficient.
  • the BSI further comprises indicating whether the configured number of coefficients is sufficient.
  • a set of possible status to codepoints mapping are summarized in Table 11-13.
  • SI FD bases sufficiency SD bases sufficiency CSI omission 000 Yes Yes Off 001 Yes Yes On 010 Yes No Off 011 yes No On 100 No Yes Off 101 No Yes On
  • the COI is indicated via an implicit indicator.
  • K NZ, 0 >0, K NZ, 1 >0, K NZ, 2 >0 and K NZ, 3 >0 then it means the actual rank is 2, while only layer 0 and 1 applied, layer 2 and layer 3 are actually removed.
  • FIGs. 3A and 3B illustrate examples of CSI omissions 300 and 301, respectively, that support layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • CSI omissions 300 and 301 may implement aspects of wireless communications systems 100 and/or 200.
  • CSI omissions 300 and 301 may include CSI reports that a UE 115 transmits based on receiving a trigger from a base station 105 as described herein. Accordingly, the UE 115 may omit one or more coefficients from the CSI report per layer based on an LOI.
  • CSI omissions 300 and 301 may occur on a second part of the CSI report (e.g., UCI part 2) .
  • This second part of the CSI report may include a beam selection 305 indicating a beam that the CSI report is measured for.
  • the second part of the CSI report may include channel information (e.g., measurements) for one or more layers 310.
  • the UE 115 may report channel information for a first layer 310-a, a second layer 310-b, a third layer 310-c, and a fourth layer 310-d.
  • Each layer 310 may include an FD selection 315, a coefficient indication 320, and a number of quantized coefficients 325.
  • the coefficient indication 320 may indicate a strongest coefficient (e.g., an LI) .
  • LOI ⁇ 1, 2, 4, 3 ⁇
  • the UE 115 may report the NNZC per layer.
  • first layer 310-a may include eight (8) NNZCs
  • second layer 310-b may include eight (8) NNZCs
  • fourth layer 310-d may include 20 NNZCs
  • third layer 310-c may include 20 NNZCs, where the UE 115 reports each number per layer.
  • the UE 115 may omit coefficients in the CSI report until an overhead of the second part of the CSI report satisfies an overhead requirement.
  • the overhead requirement may include a maximum supported payload 330 for the second part of the CSI report (e.g., a part-2 UCI payload) .
  • the UE 115 may omit the CSI of third layer 310-c (e.g., including an FD selection 315, coefficient indication 320, and quantized coefficients 325 for third layer 310-c) . Additionally or alternatively, the UE 115 may omit a portion of third layer 310-c based on the maximum supported payload 330 allowing a portion of the CSI of third layer 310-c to be transmitted.
  • the UE 115 may omit the CSI of third layer 310-c (e.g., including an FD selection 315, coefficient indication 320, and quantized coefficients 325 for third layer 310-c) .
  • the UE 115 may omit a portion of third layer 310-c based on the maximum supported payload 330 allowing a portion of the CSI of third layer 310-c to be transmitted.
  • the UE 115 may report the NNZCs as a total number of NZCs.
  • first layer 310-a may include eight (8) NNZCs
  • second layer 310-b may include eight (8) NNZCs
  • fourth layer 310-d may include 20 NNZCs
  • third layer 310-c may include 20 NNZCs
  • the UE 115 may then report a total of 56 NZCs.
  • the base station 105 may configure a pre-defined portion-of-omission parameter, ⁇ , when triggering the CSI report.
  • ⁇ may be in the example of FIG. 3B.
  • the UE 115 may omit coefficients (e.g., as indicated by omitted coefficients 335) until coefficients are collected. That is, the CSI of third layer 310-c may have a larger number of coefficients than the calculated 14 coefficients, so the UE 115 may omit third layer 310-c. In some cases, since third layer 310-c has 20 NNZCs, the UE 115 may omit 14 of the 20 NNZCs or may omit the entire CSI of third layer 310-c.
  • FIG. 4 illustrates an example of a CSI omission 400 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • CSI omission 400 may implement aspects of wireless communications systems 100 and/or 200.
  • CSI omission 400 may include a CSI report that a UE 115 transmits based on receiving a trigger from a base station 105 as described herein. Accordingly, the UE 115 may omit one or more coefficients from the CSI report per layer based on an LOI.
  • CSI omission 400 may occur on a second part of the CSI report (e.g., UCI part 2) .
  • This second part of the CSI report may include a beam selection 405 indicating a beam that the CSI report is measured for.
  • the second part of the CSI report may include channel information (e.g., measurements) for one or more layers 410.
  • the UE 115 may report channel information for a first layer 410-a, a second layer 410-b, a third layer 410-c, and a fourth layer 410-d.
  • Each layer 410 may include an FD selection 415, a coefficient indication 420, and a number of quantized coefficients 425.
  • the coefficient indication 420 may indicate a strongest coefficient (e.g., an LI) .
  • the UE 115 may omit one coefficient for third layer 410-c first, then one coefficients for fourth layer 410-d, then one coefficient for second layer 410-b, and then one coefficient for first layer 410-a, in that order until an overhead requirement is met for transmitting the CSI report.
  • the UE 115 may also arrange the channel information for each layers according to their priority levels in the CSI report.
  • the UE 115 may report the NNZC per layer.
  • first layer 410-a may include eight (8) NNZCs
  • second layer 410-b may include eight (8) NNZCs
  • fourth layer 410-d may include 20 NNZCs
  • third layer 410-c may include 20 NNZCs, where the UE 115 reports each number per layer.
  • the UE 115 may omit coefficients in the CSI report for each layer 410 until an overhead of the second part of the CSI report satisfies an overhead requirement.
  • the overhead requirement may include a maximum supported payload 430 for the second part of the CSI report (e.g., a part-2 UCI payload) .
  • the UE 115 may omit coefficients in each layer 410 including omitted coefficients 435-a in fourth layer 410-d (e.g., low priority coefficients) up to omitted coefficients 435-b in first layer 410-a (e.g., high priority coefficients) . Additionally or alternatively, if NNZCs are reported as a total number of NZCs for all layers, the UE 115 may omit coefficients on each layer until or omitted coefficients are collected as described above with reference to FIG. 2 and 3B.
  • FIGs. 5A and 5B illustrate examples of CSI feedbacks 500 and 501, respectively, that support layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • CSI feedbacks 500 and 501 may implement aspects of wireless communications systems 100 and/or 200.
  • CSI feedbacks 500 and 501 may include a base station 105-b and a UE 115-b, which may be examples of corresponding base stations 105 and UEs 115, respectively, as described above with reference to FIGs. 1-4.
  • CSI feedback 500 may illustrate a Type I CSI feedback transmission by UE 115-b (e.g., based on a Type I precoder) .
  • base station 105-b may transmit a downlink signal (e.g., downlink reference transmission) to UE 115-b over multiple candidate beams (e.g., based on oversampled DFT beams) .
  • base station 105-b may then transmit a trigger for UE 115-b to perform a CSI measurement and transmit a CSI report (e.g., for a single layer) .
  • UE 115-b may identify beam 505 as the preferred beam and may transmit a CSI report for beam 505, including a beam index 510 that corresponds to beam 505 (e.g., index of base b 1 ) .
  • the CSI report for CSI feedback 500 (e.g., Type I) may have a lower resolution, but also have a smaller payload.
  • UE 115-b may determine a precoding vector for an l-th layer given by matrix W l :
  • b may represent an oversampled DFT beam and ⁇ may represent a cross-pol co-phasing parameter.
  • ⁇ may represent a cross-pol co-phasing parameter.
  • b may be at +45 degrees, and ⁇ b may be at -45 degrees.
  • CSI feedback 501 may illustrate a Type II CSI feedback transmission by UE 115-b (e.g., based on a Type II precoder) .
  • base station 105-b may transmit a downlink signal (e.g., downlink reference transmission) to UE 115-b over multiple candidate beams (e.g., based on oversampled DFT beams) .
  • base station 105-b may then transmit a trigger for UE 115-b to perform a CSI measurement and transmit a CSI report (e.g., for multiple layers) .
  • UE 115-b may identify beams 515-a and 515-b as the preferred beams and may transmit a CSI report for beams 515-a and 515-b together (e.g., multiple layers) , including a beam index 510 that corresponds to beams 515-a and 515-b (e.g., indices of basis b 1 and b 2 ) and coefficients 520 for each beam (e.g., coefficients c 1 and c 2 for beams 515-a and 515-b, respectively) .
  • a beam index 510 that corresponds to beams 515-a and 515-b
  • coefficients 520 for each beam e.g., coefficients c 1 and c 2 for beams 515-a and 515-b, respectively.
  • the CSI report for CSI feedback 501 may have a higher resolution, but also have a larger payload (e.g., compared to CSI feedback 500) .
  • UE 115-b may determine a precoding vector for an l-th layer given by matrix W l :
  • W l may be calculate per layer/pol/beam coefficient.
  • FIGs. 6A and 6B illustrate examples of layer feedbacks 600 and 601, respectively, that support layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • layer feedbacks 600 and 601 may implement aspects of wireless communications systems 100 and/or 200.
  • Layer feedbacks 600 and 601 may illustrate a CSI feedback report for a layer 605.
  • the CSI feedback report may be a Type II CSI feedback report.
  • the subband coefficients may be transferred into another domain (e.g., DFT basis domain) , and the dominant coefficients associated with each beam may be selected in the transformed domain to feedback (i.e., for each row in a matrix V, feedback non-zero entries) . Therefore, the overall number of coefficients may be reduced comparing and, thus, overhead may also be reduced.
  • a beam reconstruction at a base station 105 e.g., network
  • a layer 605 may include a CSI feedback report that includes an SD matrix 610 (e.g., of size N tx ⁇ 2L) and an FD Matrix 615-a (e.g., of size 2L ⁇ N 3 ) .
  • the FD matrix 615-a can be compressed, such that coefficients 620 are extracted and a compressed FD matrix 615-b is left.
  • layer 605 may then include SD matrix 610 (e.g., of size N tx ⁇ 2L) , coefficients 620 (e.g., of size 2L ⁇ M) , and FD matrix 615-b (e.g., of size M ⁇ N 3 ) .
  • the CSI report may include multiple layers 605 corresponding to multiple receivers 625, where the multiple layers 605 are arranged according to a rank 630.
  • each layer 605 may include SD matrix 610 (e.g., of size N tx ⁇ 2L) , coefficients 620 (e.g., of size 2L ⁇ M) , and FD matrix 615-b (e.g., of size M ⁇ N 3 ) .
  • a UE 115 may first determine frequency domain basis and coefficient selection for the multiple layers, then identify the rank 630 (e.g., high rank) , and then calculate precoders according to estimated channels for each receiver 625.
  • FIG. 7 illustrates an example of UCI portions 700 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • UCI portions 700 may implement aspects of wireless communications systems 100 and/or 200.
  • UCI portions may include a first UCI part 705-a and a second UCI part 705-b for a CSI report as described herein that a UE 115 transmits to a base station 105.
  • First UCI part 705-a may include an RI 710, a CQI 715, an NNZC 720, FD basis 725, an intermediate FD set 730, a bitmap size 735, and a BSI 740.
  • RI 710 may indicate a rank for the CSI report (e.g., number of layers)
  • CQI 715 may indicate a channel quality for the CSI report.
  • NNZC 720 may include a per layer indication (e.g., NNZC #1, NNZC #2, etc. ) or may include an indication of a total NNZC across all layers.
  • FD basis 725 may include a M′ ⁇ M FD basis rather than a configured M FD basis.
  • intermediate FD set 730 may indicate an intermediate FD set (e.g., which may determine a bitwidth of FD basis selection) .
  • Bitmap size 735 may indicate a bitmap size for coefficient selection in the second UCI part 705-b.
  • Second UCI part 705-b may include an SD beam selection 745, an FD basis selection 750, a coefficient selection 755, an SCI 760, and a coefficient quantization 765.
  • SD beam selection may indicate a beam selected for the CSI report.
  • FD basis selection 750 may include a selection for layer 0 to R-1, where the UE 115 may report each layer individually via bitmap or combination number. Additionally or alternatively, the UE 115 may use a two-stage report for FD basis selection 750, where the first stage includes a report/configure of an intermediate (union) set for all layers and the second stage includes report each layer individually from the set reported in the first stage.
  • Coefficient selection 755 may include a selection for layer 0 to R-1, where each coefficient is indicated with a 2LM-bitmap or with a two-step, bitwidth that depends on N b .
  • SCI 760 may indicate a decision based on outcome of other issues (e.g., NNZC and K 0 ) . In some cases, SCI 760 may be on NNZC for layer i, log 2 K 0 -based on a maximum NNZC for layer i, or on total NNZC.
  • Coefficient quantization 765 may include coefficients for each layer.
  • the UE 115 may report both first UCI part 705-a and second UCI part 705-b for a triggered CSI report from the base station 105.
  • FIG. 8 illustrates an example of a process flow 800 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • process flow 800 may implement aspects of wireless communications systems 100 and/or 200.
  • Process flow 800 may include a base station 105-c and a UE 115-c, which may be examples of corresponding base stations 105 and UEs 115, as described above with reference to FIGs. 1-7.
  • the operations between UE 115-c and base station 105-c may be transmitted in a different order than the order shown, or the operations performed by base station 105-c and UE 115-c may be performed in different orders or at different times. Certain operations may also be left out of the process flow 800, or other operations may be added to the process flow 800. It is to be understood that while base station 105-c and UE 115-c are shown performing a number of the operations of process flow 800, any wireless device may perform the operations shown.
  • UE 115-c may receive, from base station 105-c, a CSI report trigger and an uplink grant configuration to carry a CSI report.
  • the CSI report may reports at least one of: a spatial domain basis, a frequency domain basis, a first NNZC indicator indicating a total number of NNZC across a set of layers, a set of second NNZC indicators indicating the NNZC of each layer of one or more layers of the set of layers, a set of bitmaps indicating indices of NNZC of each layer of the set of layers, one or more strongest coefficient indicator of each layer of one or more layers of the set of layers, quantizations of the set of the NNZCs of each of the one or more layers, or any combination thereof.
  • UE 115-c may identify a first payload of the CSI report and that the uplink grant configuration is insufficient to carry the first payload.
  • identifying the uplink grant configuration is insufficient to carry the first payload may include an allocated uplink resource based on the uplink grant configuration being insufficient to carry the CSI report with the first payload, a configured coding rate being insufficient to carry the CSI report with the first payload, or both.
  • UE 115-c may identify an LOI.
  • UE 115-c may identify the LOI that indicates at least an order of a strongest layer. Additionally or alternatively, the LOI may indicate an order of more than one layers based on a strength metric.
  • UE 115-c may report the LOI that indicates a layer order, determine the LOI based on a configuration received from base station 105-c, determine the LOI is fixed, or a combination thereof. Accordingly, in some cases, UE 115-c may jointly encode a layer index based on the layer order or may independently encode the layer index based on the layer order. Additionally or alternatively, UE 115-c may jointly encode a message to indicate the LOI and a rank indicator that indicates a number of layers for a set of layers.
  • UE 115-c may determine a priority order of a set of layers based on the layer ordering indicator, where the omission rule is based on a priority order and the omitting from the first payload of the CSI report starts from a lowest priority to a highest priority.
  • UE 115-c may identify, based on the LOI, a first layer is ordered higher than a second layer, determine the first layer has a higher priority than the second layer or the first layer has equal priority to the second layer, identify, based on the LOI, the first layer is ordered higher than the second layer, and determine the first layer has a lower priority than the second layer or the first layer has equal priority to the second layer.
  • UE 115-c may identify, based on the LOI, a first layer is included by the LOI and a second one or more layers is precluded from the LOI and may identify the first layer has a higher priority than the second one or more layers.
  • UE 115-c may identify a first layer and a second layer are precluded from the LOI and may determine respective priorities of the first layer and the second layer based on respective indices of the first layer and the second layer, respective NNZCs of the first layer and the second layer, or both. Additionally or alternatively, UE 115-c may determine one or more layers with a lowest priority at a particular omission level and may determine a portion of the first payload of the CSI report to omit based on an NNZC of the one or more layers with the lowest priority, where the portion is omitted from the first payload of the CSI report. Accordingly, the NNZC of each of the one or more layers with the lowest priority may be determined based on a per-layer NNZC indicator in an UCI part 1.
  • UE 115-c may determine a portion of the first payload of the CSI report to omit based on at least one of a number of frequency domain bases of the one or more layers with the lowest priority, or a bitmap used to indicate an NNZC indices of the one or more layers with the lowest priority, or a strongest coefficient indicator of the one or more layers with the lowest priority.
  • the portion of the first payload omitted at the particular omission level may be fixed or configured via RRC, medium access control control element (MAC CE) , downlink control information (DCI) , or any combination thereof.
  • MAC CE medium access control control element
  • DCI downlink control information
  • UE 115-c may receive a configuration of a scaling factor and may determine the portion of the first payload omitted at the particular omission level based on a product of the configured scaling factor and a maximum NNZC reported per layer.
  • UE 115-c may determine one or more layers with at least a lowest priority and a second lowest priority at a particular omission level and may determine a portion of the first payload of the CSI report to omit, where the portion of the first payload of the CSI report is omitted, layer-by-layer, from a first layer of the one or more layers with the lowest priority to a second layer of the one or more layers with the second lowest priority.
  • the portion of first payload of the CSI report to omit at the particular omission level may be fixed, configured via RRC, MAC CE, DCI, or any combination thereof.
  • an NNZC across a plurality of layers may be determined based on a total NNZC indicator reported in UCI part 2, and an NNZC of each layer of one or more layers of the plurality of layers may be determined based on at least one of: an NNZC of a layer based on a per-layer NZC indicator in UCI part 1, based on a number of bits having a defined value in a bitmap, where the bitmap is used to report indices of the NZCs of a corresponding layer.
  • UE 115-c may omit, based on the identified LOI, from the first payload of the CSI report, level by level, following an omission rule, until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting.
  • UE 115-c may transmit, to base station 105-c, the CSI report with the second payload after the omitting.
  • the CSI report may further include at least one of a wideband CQI report, one or more subband CQI reports, or both, where at least one of the wideband CQI report or the one or more subband CQI reports may be calculated based on the CSI report with the first payload, on one or more layers without NZC omission in the CSI report with the second payload, on a set of layers reported in the CSI report with the second payload, or a combination thereof.
  • the CSI report may include a set of quantizations of NZCs, and the omitting may include omitting at least a subset of the set of quantizations of NZCs.
  • FIG. 9 shows a block diagram 900 of a device 905 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the device 905 may be an example of aspects of a UE 115 as described herein.
  • the device 905 may include a receiver 910, a UE communications manager 915, and a transmitter 920.
  • the device 905 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to layer specific coefficients omission based on LOI, etc. ) . Information may be passed on to other components of the device 905.
  • the receiver 910 may be an example of aspects of the transceiver 1220 described with reference to FIG. 12.
  • the receiver 910 may utilize a single antenna or a set of antennas.
  • the UE communications manager 915 may receive, from a base station, a CSI report trigger and an uplink grant configuration to carry a CSI report.
  • the UE communications manager 915 may identify a first payload of the CSI report and that the uplink grant configuration is insufficient to carry the first payload.
  • the UE communications manager 915 may identify an LOI. Accordingly, the UE communications manager 915 may omit, based on the identified LOI, from the first payload of the CSI report, level by level, following an omission rule, until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting. Subsequently, the UE communications manager 915 may transmit the CSI report with the second payload after the omitting.
  • the UE communications manager 915 may receive, from a base station, a CSI report trigger and a UL grant configuration to carry a CSI report. In some cases, the UE communications manager 915 may generate a CSI report based on the CSI report configuration. Additionally, the UE communications manager 915 may identify a CSI omission indicator to the base station, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report. Accordingly, the UE communications manager 915 may transmit the CSI report including the identified CSI omission indicator.
  • the UE communications manager 915 may be an example of aspects of the UE communications manager 1210 described herein.
  • the UE communications manager 915 may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the UE communications manager 915, or its sub-components may be executed by a general-purpose processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • the UE communications manager 915 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the UE communications manager 915, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the UE communications manager 915, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 920 may transmit signals generated by other components of the device 905.
  • the transmitter 920 may be collocated with a receiver 910 in a transceiver module.
  • the transmitter 920 may be an example of aspects of the transceiver 1220 described with reference to FIG. 12.
  • the transmitter 920 may utilize a single antenna or a set of antennas.
  • FIG. 10 shows a block diagram 1000 of a device 1005 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the device 1005 may be an example of aspects of a device 905, or a UE 115 as described herein.
  • the device 1005 may include a receiver 1010, a UE communications manager 1015, and a transmitter 1045.
  • the device 1005 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to layer specific coefficients omission based on LOI, etc. ) . Information may be passed on to other components of the device 1005.
  • the receiver 1010 may be an example of aspects of the transceiver 1220 described with reference to FIG. 12.
  • the receiver 1010 may utilize a single antenna or a set of antennas.
  • the UE communications manager 1015 may be an example of aspects of the UE communications manager 915 as described herein.
  • the UE communications manager 1015 may include a CSI trigger receiver 1020, a first payload identifier 1025, an LOI identifier 1030, a first payload omission component 1035, a CSI report transmitter 1040, and a CSI omission indicator 1050.
  • the UE communications manager 1015 may be an example of aspects of the UE communications manager 1210 described herein.
  • the CSI trigger receiver 1020 may receive, from a base station, a CSI report trigger and an uplink grant configuration to carry a CSI report.
  • the first payload identifier 1025 may identify a first payload of the CSI report and that the uplink grant configuration is insufficient to carry the first payload.
  • the LOI identifier 1030 may identify an LOI.
  • the first payload omission component 1035 may omit, based on the identified LOI, from the first payload of the CSI report, level by level, following an omission rule, until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting.
  • the CSI report transmitter 1040 may transmit the CSI report with the second payload after the omitting.
  • the CSI omission indicator 1050 may receive, from a base station, a CSI report trigger and a UL grant configuration to carry a CSI report. In some cases, the CSI omission indicator 1050 may generate a CSI report based on the CSI report configuration. Additionally, the CSI omission indicator 1050 may identify a CSI omission indicator to the base station, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report. Accordingly, the CSI omission indicator 1050 may transmit the CSI report including the identified CSI omission indicator.
  • the transmitter 1045 may transmit signals generated by other components of the device 1005.
  • the transmitter 1045 may be collocated with a receiver 1010 in a transceiver module.
  • the transmitter 1045 may be an example of aspects of the transceiver 1220 described with reference to FIG. 12.
  • the transmitter 1045 may utilize a single antenna or a set of antennas.
  • FIG. 11 shows a block diagram 1100 of a UE communications manager 1105 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the UE communications manager 1105 may be an example of aspects of a UE communications manager 915, a UE communications manager 1015, or a UE communications manager 1210 described herein.
  • the UE communications manager 1105 may include a CSI trigger receiver 1110, a first payload identifier 1115, an LOI identifier 1120, a first payload omission component 1125, a CSI report transmitter 1130, an LOI encoder 1135, a priority determination component 1140, and a CSI omission indicator 1145.
  • Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the CSI trigger receiver 1110 may receive, from a base station, a CSI report trigger and an uplink grant configuration to carry a CSI report.
  • the CSI report may include at least one of: a spatial domain basis, a frequency domain basis, a first NNZC indicator indicating a total number of NNZC across a set of layers, a set of second NNZC indicators indicating the NNZC of each layer of one or more layers of the set of layers, a set of bitmaps indicating indices of NNZC of each layer of the set of layers, one or more strongest coefficient indicator of each layer of one or more layers of the set of layers, quantizations of the set of the NNZCs of each of the one or more layers, or any combination thereof.
  • the first payload identifier 1115 may identify a first payload of the CSI report and that the uplink grant configuration is insufficient to carry the first payload.
  • identifying that the uplink grant is insufficient to carry the first payload may include identifying an allocated uplink resource based on the uplink grant configuration is insufficient to carry the CSI report with the first payload, a configured coding rate is insufficient to carry the CSI report with the first payload, or both.
  • the LOI identifier 1120 may identify an LOI. In some examples, the LOI identifier 1120 may identify the LOI that indicates at least an order of a strongest layer. In some examples, the LOI identifier 1120 may report the LOI that indicates a layer order, determine the LOI based on a configuration received from the base station, determine the LOI is fixed, or any combination thereof. In some cases, the LOI may indicate an order of more than one layers based on a strength metric.
  • the first payload omission component 1125 may omit, based on the identified LOI, from the first payload of the CSI report, level by level, following an omission rule, until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting.
  • the CSI report transmitter 1130 may transmit the CSI report with the second payload after the omitting.
  • the CSI report may further include at least one of a wideband CQI report, one or more subband CQI reports, or both, where at least one of the wideband CQI report or the one or more subband CQI reports is calculated based on the CSI report with the first payload, on one or more layers without NZC omission in the CSI report with the second payload, on a set of layers reported in the CSI report with the second payload, or a combination thereof.
  • the CSI report may include a set of quantizations of NZCs, and the omitting includes omitting at least a subset of the set of quantizations of NZCs.
  • the LOI encoder 1135 may jointly encode of a layer index based on the layer order or may independently encode the layer index based on the layer order. In some examples, the LOI encoder 1135 may jointly encode a message to indicate the LOI and a rank indicator that indicates a number of layers for a set of layers.
  • the priority determination component 1140 may determine a priority order of a set of layers based on the LOI, where the omission rule is based on a priority order and the omitting from the first payload of the CSI report starts from a lowest priority to a highest priority.
  • the priority determination component 1140 may identify, based on the LOI, a first layer is ordered higher than a second layer, determine the first layer has a higher priority than the second layer or the first layer has equal priority to the second layer, identify, based on the LOI, the first layer is ordered higher than the second layer, determine the first layer has a lower priority than the second layer or the first layer has equal priority to the second layer, or a combination thereof.
  • the priority determination component 1140 may identify, based on the LOI, a first layer is included by the LOI and a second one or more layers is precluded from the LOI and may identify the first layer has a higher priority than the second one or more layers. In some examples, the priority determination component 1140 may identify a first layer and a second layer are precluded from the LOI and may determine respective priorities of the first layer and the second layer based on respective indices of the first layer and the second layer, respective NNZCs of the first layer and the second layer, or both.
  • the priority determination component 1140 may determine one or more layers with a lowest priority at a particular omission level and may determine a portion of the first payload of the CSI report to omit based on an NNZC of the one or more layers with the lowest priority, where the portion is omitted from the first payload of the CSI report. Additionally or alternatively, the priority determination component 1140 may determine a portion of the first payload of the CSI report to omit based on at least one of a number of frequency domain bases of the one or more layers with the lowest priority, or a bitmap used to indicate an NNZC indices of the one or more layers with the lowest priority, or a strongest coefficient indicator of the one or more layers with the lowest priority.
  • the priority determination component 1140 may receive a configuration of a scaling factor and may determine the portion of the first payload omitted at the particular omission level based on a product of the configured scaling factor and a maximum NNZC reported per layer. Additionally or alternatively, the priority determination component 1140 may determine one or more layers with at least a lowest priority and a second lowest priority at a particular omission level and may determine a portion of the first payload of the CSI report to omit, where the portion of the first payload of the CSI report is omitted, layer-by-layer, from a first layer of the one or more layers with the lowest priority to a second layer of the one or more layers with the second lowest priority.
  • the NNZC of each of the one or more layers with the lowest priority may be determined based on a per-layer NNZC indicator in UCI part 1. Additionally or alternatively, the portion of the first payload omitted at the particular omission level and/or the portion of first payload of the CSI report to omit at the particular omission level may be fixed or configured via RRC, MAC CE, DCI, or any combination thereof. In some cases, the portion of first payload of the CSI report to omit at the particular omission level may be determined based on at least one of an NNZC across a set of layers, an NNZC of each layer of one or more layers of the set of layers, or any combination thereof.
  • an NNZC across a set of layers may be determined based on a total NNZC indicator reported in UCI part 2.
  • an NNZC of each layer of one or more layers of the set of layers may be determined based on at least one of: an NNZC of a layer based on a per-layer NZC indicator in UCI part 1, based on a number of bits having a defined value in a bitmap, where the bitmap is used to report indices of the NZCs of a corresponding layer.
  • the CSI omission indicator 1145 may receive, from a base station, a CSI report trigger and a UL grant configuration to carry a CSI report. In some cases, the CSI omission indicator 1145 may generate a CSI report based on the CSI report configuration. Additionally, the CSI omission indicator 1145 may identify a CSI omission indicator to the base station, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report. Accordingly, the CSI omission indicator 1145 may transmit the CSI report including the identified CSI omission indicator.
  • the CSI omission indicator 1145 may identify a first payload size of the generated CSI report and identifying the UL grant configuration is insufficient, may omit a portion of the generated CSI report and identifying a second payload size of the omitted CSI report, and may transmit the CSI report including the identified CSI omission indicator. Additionally, transmitting the CSI report including the identified CSI omission indicator may include the CSI omission indicator 1145 transmitting an explicit indication of the CSI omission indicator. In some cases, the explicit indication may be a 1-bit indicator.
  • the CSI omission indicator may further include the CSI omission indicator 1145 generating an indicator jointly indicating the CSI omission indicator with other indicators.
  • the other indicators may include a basis sufficiency indicator, the basis sufficiency indicator comprising at least one of: indicating the sufficiency of the configured FD bases, the sufficiency of the configured SD bases, or the max number of NZCs configured by the base station.
  • transmitting the CSI report including the identified CSI omission indicator may further include the CSI omission indicator 1145 transmitting an RI and a per-layer NNZC, where the CSI omission indicator may be identified based on RI and per-layer NNZC. Additionally, the CSI omission indicator being identified based on RI and per-layer NNZC may further include the CSI omission indicator 1145 identifying CSI omission whether the RI is equal to the number of layers with non-zero coefficients based on the per-layer NNZC. In some cases, the CSI omission indicator may further indicate which layers are omitted based on the RI and per-layer NNZC.
  • the CSI report configuration may include at least one of a number of one or more spatial domain basis, a number of one or more frequency domain basis for one or more layers, a max number of coefficients for each of the one or more layers, a max total number of coefficients for all layers, or any combination thereof.
  • FIG. 12 shows a diagram of a system 1200 including a device 1205 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the device 1205 may be an example of or include the components of device 905, device 1005, or a UE 115 as described herein.
  • the device 1205 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a UE communications manager 1210, an I/O controller 1215, a transceiver 1220, an antenna 1225, memory 1230, and a processor 1240. These components may be in electronic communication via one or more buses (e.g., bus 1245) .
  • buses e.g., bus 1245
  • the UE communications manager 1210 may receive, from a base station, a CSI report trigger and an uplink grant configuration to carry a CSI report.
  • the UE communications manager 1210 may identify a first payload of the CSI report and that the uplink grant configuration is insufficient to carry the first payload.
  • the UE communications manager 1210 may identify an LOI. Accordingly, the UE communications manager 1210 may omit, based on the identified LOI, from the first payload of the CSI report, level by level, following an omission rule, until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting. Subsequently, the UE communications manager 1210 may transmit the CSI report with the second payload after the omitting.
  • the UE communications manager 1210 may receive, from a base station, a CSI report trigger and a UL grant configuration to carry a CSI report. In some cases, the UE communications manager 1210 may generate a CSI report based on the CSI report configuration. Additionally, the UE communications manager 1210 may identify a CSI omission indicator to the base station, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report. Accordingly, the UE communications manager 1210 may transmit the CSI report including the identified CSI omission indicator.
  • the I/O controller 1215 may manage input and output signals for the device 1205.
  • the I/O controller 1215 may also manage peripherals not integrated into the device 1205.
  • the I/O controller 1215 may represent a physical connection or port to an external peripheral.
  • the I/O controller 1215 may utilize an operating system such as or another known operating system.
  • the I/O controller 1215 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 1215 may be implemented as part of a processor.
  • a user may interact with the device 1205 via the I/O controller 1215 or via hardware components controlled by the I/O controller 1215.
  • the transceiver 1220 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 1220 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 1220 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 1225. However, in some cases the device may have more than one antenna 1225, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 1230 may include random-access memory (RAM) and read-only memory (ROM) .
  • the memory 1230 may store computer-readable, computer-executable code 1235 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 1230 may contain, 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.
  • BIOS basic I/O system
  • the processor 1240 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a central processing unit (CPU) , a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 1240 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 1240.
  • the processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1230) to cause the device 1205 to perform various functions (e.g., functions or tasks supporting layer specific coefficients omission based on LOI) .
  • the code 1235 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 1235 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1235 may not be directly executable by the processor 1240 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 13 shows a block diagram 1300 of a device 1305 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the device 1305 may be an example of aspects of a base station 105 as described herein.
  • the device 1305 may include a receiver 1310, a base station communications manager 1315, and a transmitter 1320.
  • the device 1305 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 1310 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to layer specific coefficients omission based on LOI, etc. ) . Information may be passed on to other components of the device 1305.
  • the receiver 1310 may be an example of aspects of the transceiver 1620 described with reference to FIG. 16.
  • the receiver 1310 may utilize a single antenna or a set of antennas.
  • the base station communications manager 1315 may transmit, to a UE, a CSI report trigger and an uplink grant configuration to carry a CSI report. Additionally, the base station communications manager 1315 may receive the CSI report wherein the CSI report comprised two parts and is transmitted by the UE via a two-part UCI. In some cases, the base station communications manager 1315 may identify a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload. Additionally, the base station communications manager 1315 may identify an LOI.
  • the base station communications manager 1315 may determine that, based on the identified LOI, level by level, an omission rule has been applied to the first payload of the CSI report until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting. Subsequently, the base station communications manager 1315 may recover the second part of the CSI report based on the second payload.
  • the base station communications manager 1315 may be an example of aspects of the base station communications manager 1610 described herein.
  • the base station communications manager 1315 may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the base station communications manager 1315, or its sub-components may be executed by a general-purpose processor, a DSP, an ASIC, 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 in the present disclosure.
  • code e.g., software or firmware
  • the functions of the base station communications manager 1315, or its sub-components may be executed by a general-purpose processor, a DSP, an ASIC, 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 in the present disclosure.
  • the base station communications manager 1315 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the base station communications manager 1315, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the base station communications manager 1315, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 1320 may transmit signals generated by other components of the device 1305.
  • the transmitter 1320 may be collocated with a receiver 1310 in a transceiver module.
  • the transmitter 1320 may be an example of aspects of the transceiver 1620 described with reference to FIG. 16.
  • the transmitter 1320 may utilize a single antenna or a set of antennas.
  • FIG. 14 shows a block diagram 1400 of a device 1405 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the device 1405 may be an example of aspects of a device 1305, or a base station 105 as described herein.
  • the device 1405 may include a receiver 1410, a base station communications manager 1415, and a transmitter 1445.
  • the device 1405 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 1410 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to layer specific coefficients omission based on LOI, etc. ) . Information may be passed on to other components of the device 1405.
  • the receiver 1410 may be an example of aspects of the transceiver 1620 described with reference to FIG. 16.
  • the receiver 1410 may utilize a single antenna or a set of antennas.
  • the base station communications manager 1415 may be an example of aspects of the base station communications manager 1315 as described herein.
  • the base station communications manager 1415 may include a CSI trigger component 1420, an insufficient grant identifier 1425, an LOI component 1430, an omission rule component 1435, and a CSI report receiver 1440.
  • the base station communications manager 1415 may be an example of aspects of the base station communications manager 1610 described herein.
  • the CSI trigger component 1420 may transmit, to a UE, a CSI report trigger and an uplink grant configuration to carry a CSI report. Additionally, the CSI trigger component 1420 may receive the CSI report, where the CSI report includes two parts and is transmitted by the UE via a two-part UCI.
  • the insufficient grant identifier 1425 may identify a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload.
  • the LOI component 1430 may identify an LOI.
  • the omission rule component 1435 may determine that, based on the identified LOI, level by level, an omission rule has been applied to the first payload of the CSI report until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting.
  • the CSI report receiver 1440 may recover the second part of the CSI report based on the second payload.
  • the transmitter 1445 may transmit signals generated by other components of the device 1405.
  • the transmitter 1445 may be collocated with a receiver 1410 in a transceiver module.
  • the transmitter 1445 may be an example of aspects of the transceiver 1620 described with reference to FIG. 16.
  • the transmitter 1445 may utilize a single antenna or a set of antennas.
  • FIG. 15 shows a block diagram 1500 of a base station communications manager 1505 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the base station communications manager 1505 may be an example of aspects of a base station communications manager 1315, a base station communications manager 1415, or a base station communications manager 1610 described herein.
  • the base station communications manager 1505 may include a CSI trigger component 1510, an insufficient grant identifier 1515, an LOI component 1520, an omission rule component 1525, a CSI report receiver 1530, an LOI decoder 1535, and a priority order determination component 1540.
  • Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the CSI trigger component 1510 may transmit, to a UE, a CSI report trigger and an uplink grant configuration to carry a CSI report.
  • the CSI report may include at least one of: one or more spatial domain basis, one or more frequency domain basis for one or more layers, a first NNZC indicator indicating a total number of NNZC across a set of layers, a set of second NNZC indicators indicating the NNZC of each layer of one or more layers of the set of layers, a set of bitmaps indicating indices of NNZC of each layer of the set of layers, one or more strongest coefficient indicator of each layer of one or more layers of the set of layers, quantizations of the set of the NNZCs of each of the one or more layers, or any combination thereof. Additionally, in some cases, the CSI trigger component 1510 may receive the CSI report, where the CSI report includes two parts and is transmitted by the UE via a two-part UCI.
  • the insufficient grant identifier 1515 may identify a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload.
  • identifying that the uplink grant configuration is insufficient to carry the first payload may include identifying an allocated uplink resource based on the uplink grant configuration is insufficient to carry the CSI report with the first payload, a configured coding rate is insufficient to carry the CSI report with the first payload, or both.
  • the LOI component 1520 may identify an LOI. In some examples, the LOI component 1520 may identify the LOI that indicates at least an order of a strongest layer.
  • the LOI component 1520 may receive a report from the UE with the LOI that indicates a layer order, determine the LOI based on a configuration configured by the base station, determine the LOI is fixed, or any combination thereof.
  • the LOI may indicate an order of more than one layers based on a strength metric.
  • the fixed layer order indicator may be based on indices of layers of the first payload of the CSI report.
  • the indices of layers may be based on a mapping order of each layer in the first payload of the CSI report, and the mapping may include mapping one or more CSI components of a layer.
  • the mapping order of each layer may be based on a strength metric.
  • the omission rule component 1525 may determine that, based on the identified LOI, level by level, an omission rule has been applied to the first payload of the CSI report until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting.
  • the CSI report receiver 1530 may recover the second part of the CSI report based on the second payload.
  • the CSI report may further include at least one of a wideband CQI report, one or more subband CQI reports, or both, where at least one of the wideband CQI report or the one or more subband CQI reports is calculated based on the CSI report with the first payload, on one or more layers without NZC omission in the CSI report with the second payload, on a set of layers reported in the CSI report with the second payload, or a combination thereof.
  • the CSI report may include a set of quantizations of NZCs and the omitting includes omitting at least a subset of the set of quantizations of NZCs.
  • the LOI decoder 1535 may jointly decode of a layer index based on the layer order or may independently decode the layer index based on the layer order. In some examples, the LOI decoder 1535 may jointly decode a message that indicates the LOI and a rank indicator that indicates a number of layers for a set of layers.
  • the priority order determination component 1540 may determine a priority order of a set of layers based on the LOI, where the omission rule is based on a priority order and the omitting from the first payload of the CSI report starts from a lowest priority to a highest priority.
  • the priority order determination component 1540 may identify, based on the LOI, a first layer is ordered higher than a second layer, determine the first layer has a higher priority than the second layer or the first layer has equal priority to the second layer, identify, based on the LOI, the first layer is ordered higher than the second layer, determine the first layer has a lower priority than the second layer or the first layer has equal priority to the second layer, or a combination thereof.
  • the priority order determination component 1540 may identify, based on the LOI, a first layer is included by the LOI and a second one or more layers is precluded from the LOI and may identify the first layer has a higher priority than the second one or more layers.
  • the priority order determination component 1540 may identify a first layer and a second layer are precluded from the LOI and may determine respective priorities of the first layer and the second layer based on respective indices of the first layer and the second layer, respective NNZCs of the first layer and the second layer, or both.
  • the respective indices of the first layer and the second layer may be based on a mapping order of each layer in the first payload of the CSI report, and the mapping may include mapping one or more CSI components of a layer.
  • the priority order determination component 1540 may determine one or more layers with a lowest priority at a particular omission level and may determine a portion of the first payload of the CSI report has been omitted based on an NNZC of the one or more layers with the lowest priority, where the portion is omitted from the first payload of the CSI report. Additionally or alternatively, the priority order determination component 1540 may determine a portion of the first payload of the CSI report has been omitted based on at least one of a number of frequency domain bases of the one or more layers with the lowest priority, or a bitmap used to indicate an NNZC indices of the one or more layers with the lowest priority, or a strongest coefficient indicator of the one or more layers with the lowest priority.
  • the priority order determination component 1540 may transmit a configuration of a scaling factor and may determine the portion of the first payload has been omitted at the particular omission level based on a product of the configured scaling factor and a maximum NNZC reported per layer. Additionally or alternatively, the priority order determination component 1540 may determine one or more layers with at least a lowest priority and a second lowest priority at a particular omission level and may determine a portion of the first payload of the CSI report has been omitted, where the portion of the first payload of the CSI report is omitted, layer-by-layer, from a first layer of the one or more layers with the lowest priority to a second layer of the one or more layers with the second lowest priority.
  • the NNZC of each of the one or more layers with the lowest priority is determined based on a per-layer NNZC indicator in UCI part 1. Additionally or alternatively, the NNZC of each of the one or more layers with the lowest priority may be determined based on an NNZC indicator indicating a total number of NZC across all layers in UCI part 1. Additionally, the portion of the first payload that has been omitted at the particular omission level and/or the portion of first payload of the CSI report that has been omitted at the particular omission level may be fixed or configured via RRC, MAC CE, DCI, or any combination thereof.
  • the portion of first payload of the CSI report that has been omitted at the particular omission level may be determined based on at least one of an NNZC across a set of layers, an NNZC of each layer of one or more layers of the set of layers, or any combination thereof.
  • an NNZC across a set of layers is determined based on a total NNZC indicator reported in UCI part 1.
  • an NNZC of each layer of one or more layers of the set of layers is determined based on at least one of: an NNZC of a layer based on a per-layer NZC indicator in UCI part 1, based on a number of bits having a defined value in a bitmap, where the bitmap is used to report indices of the NZCs of a corresponding layer.
  • FIG. 16 shows a diagram of a system 1600 including a device 1605 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the device 1605 may be an example of or include the components of device 1305, device 1405, or a base station 105 as described herein.
  • the device 1605 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a base station communications manager 1610, a network communications manager 1615, a transceiver 1620, an antenna 1625, memory 1630, a processor 1640, and an inter-station communications manager 1645. These components may be in electronic communication via one or more buses (e.g., bus 1650) .
  • buses e.g., bus 1650
  • the base station communications manager 1610 may transmit, to a UE, a CSI report trigger and an uplink grant configuration to carry a CSI report. Additionally, the base station communications manager 1610 may receive the CSI report, where the CSI report includes two parts and is transmitted by the UE via a two-part UCI. In some cases, the base station communications manager 1610 may identify a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload. Additionally, the base station communications manager 1610 may identify an LOI.
  • the base station communications manager 1610 may determine that, based on the identified LOI, level by level, an omission rule has been applied to the first payload of the CSI report until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting. Subsequently, the base station communications manager 1610 may recover the second part of the CSI report based on the second payload.
  • the network communications manager 1615 may manage communications with the core network (e.g., via one or more wired backhaul links) .
  • the network communications manager 1615 may manage the transfer of data communications for client devices, such as one or more UEs 115.
  • the transceiver 1620 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 1620 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 1620 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 1625. However, in some cases the device may have more than one antenna 1625, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 1630 may include RAM, ROM, or a combination thereof.
  • the memory 1630 may store computer-readable code 1635 including instructions that, when executed by a processor (e.g., the processor 1640) cause the device to perform various functions described herein.
  • a processor e.g., the processor 1640
  • the memory 1630 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 1640 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 1640 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into processor 1640.
  • the processor 1640 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1630) to cause the device 1605 to perform various functions (e.g., functions or tasks supporting layer specific coefficients omission based on LOI) .
  • the inter-station communications manager 1645 may manage communications with other base station 105, and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communications manager 1645 may coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communications manager 1645 may provide an X2 interface within an LTE/LTE-Awireless communication network technology to provide communication between base stations 105.
  • the code 1635 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 1635 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1635 may not be directly executable by the processor 1640 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 17 shows a flowchart illustrating a method 1700 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the operations of method 1700 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1700 may be performed by a UE communications manager as described with reference to FIGs. 9 through 12.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may receive, from a base station, a CSI report trigger and an uplink grant configuration to carry a CSI report.
  • the operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed by a CSI trigger receiver as described with reference to FIGs. 9 through 12.
  • the UE may identify a first payload of the CSI report and that the uplink grant configuration is insufficient to carry the first payload.
  • the operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by a first payload identifier as described with reference to FIGs. 9 through 12.
  • the UE may identify an LOI.
  • the operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed by an LOI identifier as described with reference to FIGs. 9 through 12.
  • the UE may omit, based on the identified LOI, from the first payload of the CSI report, level by level, following an omission rule, until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting.
  • the operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be performed by a first payload omission component as described with reference to FIGs. 9 through 12.
  • the UE may transmit the CSI report with the second payload after the omitting.
  • the operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be performed by a CSI report transmitter as described with reference to FIGs. 9 through 12.
  • FIG. 18 shows a flowchart illustrating a method 1800 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the operations of method 1800 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1800 may be performed by a UE communications manager as described with reference to FIGs. 9 through 12.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may receive, from a base station, a CSI report trigger and an uplink grant configuration to carry a CSI report.
  • the operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed by a CSI trigger receiver as described with reference to FIGs. 9 through 12.
  • the UE may identify a first payload of the CSI report and that the uplink grant configuration is insufficient to carry the first payload.
  • the operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed by a first payload identifier as described with reference to FIGs. 9 through 12.
  • the UE may identify an LOI.
  • the operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed by an LOI identifier as described with reference to FIGs. 9 through 12.
  • the UE may determine a priority order of a set of layers based on the LOI, where the omission rule is based on a priority order and the omitting from the first payload of the CSI report starts from a lowest priority to a highest priority.
  • the operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed by a priority determination component as described with reference to FIGs. 9 through 12.
  • the UE may omit, based on the identified LOI, from the first payload of the CSI report, level by level, following an omission rule, until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting.
  • the operations of 1825 may be performed according to the methods described herein. In some examples, aspects of the operations of 1825 may be performed by a first payload omission component as described with reference to FIGs. 9 through 12.
  • the UE may transmit the CSI report with the second payload after the omitting.
  • the operations of 1830 may be performed according to the methods described herein. In some examples, aspects of the operations of 1830 may be performed by a CSI report transmitter as described with reference to FIGs. 9 through 12.
  • FIG. 19 shows a flowchart illustrating a method 1900 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the operations of method 1900 may be implemented by a base station 105 or its components as described herein.
  • the operations of method 1900 may be performed by a base station communications manager as described with reference to FIGs. 13 through 16.
  • a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.
  • the base station may transmit, to a UE, a CSI report trigger and an uplink grant configuration to carry a CSI report and may receive the CSI report, where the CSI report includes two parts and is transmitted by the UE via a two-part UCI.
  • the operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed by a CSI trigger component as described with reference to FIGs. 13 through 16.
  • the base station may identify a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload.
  • the operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed by an insufficient grant identifier as described with reference to FIGs. 13 through 16.
  • the base station may identify an LOI.
  • the operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed by an LOI component as described with reference to FIGs. 13 through 16.
  • the base station may determine that, based on the identified LOI, level by level, an omission rule has been applied to the first payload of the CSI report until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting.
  • the operations of 1920 may be performed according to the methods described herein. In some examples, aspects of the operations of 1920 may be performed by an omission rule component as described with reference to FIGs. 13 through 16.
  • the base station may recover the second part of the CSI report based on the second payload.
  • the operations of 1925 may be performed according to the methods described herein. In some examples, aspects of the operations of 1925 may be performed by a CSI report receiver as described with reference to FIGs. 13 through 16.
  • FIG. 20 shows a flowchart illustrating a method 2000 that supports layer specific coefficients omission based on LOI in accordance with aspects of the present disclosure.
  • the operations of method 2000 may be implemented by a base station 105 or its components as described herein.
  • the operations of method 2000 may be performed by a base station communications manager as described with reference to FIGs. 13 through 16.
  • a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.
  • the base station may transmit, to a UE, a CSI report trigger and an uplink grant configuration to carry a CSI report and may receive the CSI report, where the CSI report includes two parts and is transmitted by the UE via a two-part UCI.
  • the operations of 2005 may be performed according to the methods described herein. In some examples, aspects of the operations of 2005 may be performed by a CSI trigger component as described with reference to FIGs. 13 through 16.
  • the base station may identify a first payload of the second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload.
  • the operations of 2010 may be performed according to the methods described herein. In some examples, aspects of the operations of 2010 may be performed by an insufficient grant identifier as described with reference to FIGs. 13 through 16.
  • the base station may identify an LOI.
  • the operations of 2015 may be performed according to the methods described herein. In some examples, aspects of the operations of 2015 may be performed by an LOI component as described with reference to FIGs. 13 through 16.
  • the base station may determine a priority order of a set of layers based on the LOI, where the omission rule is based on a priority order and the omitting from the first payload of the CSI report starts from a lowest priority to a highest priority.
  • the operations of 2020 may be performed according to the methods described herein. In some examples, aspects of the operations of 2020 may be performed by a priority order determination component as described with reference to FIGs. 13 through 16.
  • the base station may determine that, based on the identified LOI, level by level, an omission rule has been applied to the first payload of the CSI report until the uplink grant configuration is sufficient to carry a second payload of the CSI report after the omitting.
  • the operations of 2025 may be performed according to the methods described herein. In some examples, aspects of the operations of 2025 may be performed by an omission rule component as described with reference to FIGs. 13 through 16.
  • the base station may recover the second part of the CSI report based on the second payload.
  • the operations of 2030 may be performed according to the methods described herein. In some examples, aspects of the operations of 2030 may be performed by a CSI report receiver as described with reference to FIGs. 13 through 16.
  • Embodiment 1 A method for wireless communications by a UE, comprising: receiving, from a base station, a CSI report trigger and an uplink grant configuration to carry a CSI report; identifying a first payload of the CSI report and that the uplink grant configuration is insufficient to carry the first payload; identifying a layer order indicator; omitting, based at least in part on the identified layer order indicator, from the first payload of the CSI report, level by level, following an omission rule, until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting; and transmitting the CSI report with the second payload after the omitting.
  • Embodiment 2 The method of embodiment 1, wherein identifying the layer order indicator comprises: identifying the layer order indicator that indicates at least an order of a strongest layer.
  • Embodiment 3 The method of any of embodiments 1 to 2, wherein the CSI report reports at least one of: one or more spatial domain basis, one or more frequency domain basis, a first NNZC indicator indicating a total number of NNZC across a plurality of layers, a plurality of second NNZC indicators indicating the NNZC of each layer of one or more layers of the plurality of layers, a plurality of bitmaps indicating indices of NNZC of each layer of the plurality of layers, one or more strongest coefficient indicator of each layer of one or more layers of the plurality of layers, quantizations of the plurality of the NNZCs of each of the one or more layers, or any combination thereof.
  • Embodiment 4 The method of any of embodiments 1 to 3, wherein the layer order indicator indicates an order of more than one layers based at least in part on a strength metric.
  • Embodiment 5 The method of any of embodiments 1 to 4, wherein identifying the layer order indicator comprises: reporting the layer order indicator that indicates a layer order; or determining the layer order indicator based at least in part on a configuration received from the base station; or the layer order indicator is fixed, or any combination thereof.
  • the fixed layer order indicator is based at least in part on indices of layers of the first payload of the CSI report.
  • the indices of layers are based on a mapping order of each layer in the first payload of the CSI report, and the mapping comprises mapping one or more CSI components of a layer.
  • the mapping order of each layer is based at least in part on a strength metric.
  • Embodiment 6 The method of embodiment 5, wherein reporting the layer order indicator further comprises: jointly encoding of a layer index based at least in part on the layer order; or independently encoding the layer index based at least in part on the layer order.
  • Embodiment 7 The method of embodiment 5, wherein reporting the layer order indicator further comprises: jointly encoding a message to indicate the layer ordering indicator and a rank indicator that indicates a number of layers for a plurality of layers.
  • Embodiment 8 The method of any of embodiments 1 to 7, further comprising: determining a priority order of a plurality of layers based at least in part on the layer ordering indicator, wherein the omission rule is based at least in part on a priority order and the omitting from the first payload of the CSI report starts from a lowest priority to a highest priority.
  • Embodiment 9 The method of embodiment 8, further comprising: identifying, based at least in part on the layer order indicator, a first layer is ordered higher than a second layer and determining the first layer has a higher priority than the second layer or the first layer has equal priority to the second layer; or identifying, based at least in part on the layer order indicator, the first layer is ordered higher than the second layer, and determining the first layer has a lower priority than the second layer or the first layer has equal priority to the second layer.
  • Embodiment 10 further comprises: identifying, based at least in part on the layer order indicator, a first layer is included by the layer order indicator and a second one or more layers is precluded from the layer order indicator; and identifying the first layer has a higher priority than the second one or more layers.
  • Embodiment 11 The method of embodiment 8, further comprises: identifying a first layer and a second layer are precluded from the layer order indicator; and determining respective priorities of the first layer and the second layer based at least in part on respective indices of the first layer and the second layer, respective numbers of non-zero coefficients of the first layer and the second layer, or both.
  • the respective indices of the first layer and the second layer are based on a mapping order of each layer in the first payload of the CSI report, and the mapping comprises mapping one or more CSI components of a layer.
  • Embodiment 12 further comprises: determining one or more layers with a lowest priority at a particular omission level; and determining a portion of the first payload of the CSI report to omit based at least in part on a number of non-zero coefficients of the one or more layers with the lowest priority, where the portion is omitted from the first payload of the CSI report.
  • Embodiment 13 The method of embodiment 12, wherein the number of non-zero coefficients of each of the one or more layers with the lowest priority is determined based at least in part on a per-layer NNZC indicator in UCI part 1. Additionally or alternatively, the NNZCs of each of the one or more layers with the lowest priority is determined based at least in part on an NNZC indicator indicating a total number of NZCs across all layers in UCI part 1
  • Embodiment 14 The method of embodiment 12, further comprises: determining a portion of the first payload of the CSI report to omit based at least in part on at least one of a number of frequency domain bases of the one or more layers with the lowest priority, or a bitmap used to indicate a number of non-zero coefficients indices of the one or more layers with the lowest priority, or a strongest coefficient indicator of the one or more layers with the lowest priority.
  • Embodiment 15 The method of embodiment 12, wherein the portion of the first payload omitted at the particular omission level is fixed or configured via RRC, MAC CE, DCI, or any combination thereof.
  • Embodiment 16 The method of embodiment 12, further comprising: receiving a configuration of a scaling factor; and determining the portion of the first payload omitted at the particular omission level based at least in part on a product of the configured scaling factor and a maximum number of non-zero coefficients reported per layer.
  • Embodiment 17 The method of any of embodiments 8 to 16, further comprises: determining one or more layers with at least a lowest priority and a second lowest priority at a particular omission level; and determining a portion of the first payload of the CSI report to omit, wherein the portion of the first payload of the CSI report is omitted, layer-by-layer, from a first layer of the one or more layers with the lowest priority to a second layer of the one or more layers with the second lowest priority.
  • Embodiment 18 The method of embodiment 17, wherein the portion of first payload of the CSI report to omit at the particular omission level is fixed, configured via RRC, MAC CE, DCI, or any combination thereof.
  • Embodiment 19 The method of embodiment 17, wherein the portion of first payload of the CSI report to omit at the particular omission level is determined based at least in part on at least one of a number of non-zero coefficients across a plurality of layers, a number of non-zero coefficients of each layer of one or more layers of the plurality of layers, or any combination thereof.
  • Embodiment 20 The method of embodiment 19, wherein: a number of non-zero coefficients across a plurality of layers is determined based at least in part on a total number of non-zero coefficients indicator reported in UCI part 1; and a number of non-zero coefficients of each layer of one or more layers of the plurality of layers is determined based at least in part on at least one of: a NNZC of a layer based at least in part on a per-layer NZC indicator in UCI part 1, based at least in part on a number of bits having a defined value in a bitmap, wherein the bitmap is used to report indices of the NZCs of a corresponding layer.
  • Embodiment 21 The method of any of embodiments 1 to 20, wherein the CSI report further comprises at least one of a wideband CQI report, one or more subband CQI reports, or both, and wherein at least one of the wideband CQI report or the one or more subband CQI reports is calculated based at least in part on the CSI report with the first payload.
  • Embodiment 22 The method of any of embodiments 1 to 21, wherein the CSI report further comprises at least one of a wideband CQI report or one or more subband CQI reports, and wherein at least one of the wideband CQI report or the one or more subband CQI reports is calculated based at least in part on one or more layers without CSI omission in the CSI report with the second payload.
  • Embodiment 23 The method of any of embodiments 1 to 22, wherein the CSI report further comprises at least one of a wideband CQI report or one or more subband CQI reports, and wherein at least one of the wideband CQI report or the one or more subband CQI reports is calculated based at least in part on a plurality of layers reported in the CSI report with the second payload.
  • Embodiment 24 The method of any of embodiments 1 to 23, wherein the CSI report comprises a plurality of quantizations of NZCs and the omitting comprises omitting at least a subset of the plurality of quantizations of NZCs.
  • Embodiment 25 The method of any of embodiments 1 to 24, wherein the UL grant configuration being insufficient to carry the CSI report with the first payload further comprises at least one of: an allocated UL resource based at least in part on the UL grant configuration is insufficient to carry the CSI report with the first payload; a configured coding rate is insufficient to carry the CSI report with the first payload, or both.
  • Embodiment 26 A method for wireless communications by a base station, comprising: transmitting, to a UE, a CSI report trigger and an uplink grant configuration to carry a CSI report; receiving the CSI report that comprises two parts and is transmitted by the UE via a two-part UCI; identifying a first payload of a second part of the CSI report based on recovering the first part of the CSI report and identifying that the UL grant configuration is insufficient to carry the first payload; identifying a layer order indicator; determining that, based at least in part on the identified layer order indicator, level by level, an omission rule has been applied to the first payload of the CSI report until the UL grant configuration is sufficient to carry a second payload of the CSI report after the omitting; and recovering the second part of the CSI report based on the second payload.
  • Embodiment 27 The method of embodiment 26, wherein identifying the layer order indicator comprises: identifying the layer order indicator that indicates at least an order of a strongest layer.
  • Embodiment 28 The method of any of embodiments 26 to 27, wherein the CSI report reports at least one of: one or more spatial domain basis, one or more frequency domain basis for one or more layers, a first NNZC indicator indicating a total number of NNZC across a plurality of layers, a plurality of second NNZC indicators indicating the NNZC of each layer of one or more layers of the plurality of layers, a plurality of bitmaps indicating indices of NNZC of each layer of the plurality of layers, one or more strongest coefficient indicator of each layer of one or more layers of the plurality of layers, quantizations of the plurality of the NNZCs of each of the one or more layers, or any combination thereof.
  • Embodiment 29 The method of any of embodiments 26 to 28, wherein the layer order indicator indicates an order of more than one layers based at least in part on a strength metric.
  • Embodiment 30 The method of any of embodiments 26 to 29, wherein identifying the layer order indicator comprises: receiving a report from the UE with the layer order indicator that indicates a layer order; or determining the layer order indicator based at least in part on a configuration configured by the base station; or the layer order indicator is fixed, or any combination thereof.
  • the fixed layer order indicator is based at least in part on indices of layers of the first payload of the CSI report.
  • the indices of layers are based on a mapping order of each layer in the first payload of the CSI report, and the mapping comprises mapping one or more CSI components of a layer.
  • the mapping order of each layer is based at least in part on a strength metric.
  • Embodiment 31 The method of embodiment 30, wherein receiving the report comprises: jointly decoding of a layer index based at least in part on the layer order; or independently decoding the layer index based at least in part on the layer order.
  • Embodiment 32 The method of embodiment 30, wherein receiving the report comprises: jointly decoding a message that indicates the layer ordering indicator and a rank indicator that indicates a number of layers for a plurality of layers.
  • Embodiment 33 The method of any of embodiments 26 to 32, further comprising: determining a priority order of a plurality of layers based at least in part on the layer ordering indicator, wherein the omission rule is based at least in part on a priority order and the omitting from the first payload of the CSI report starts from a lowest priority to a highest priority.
  • Embodiment 34 The method of embodiment 33, further comprising: identifying, based at least in part on the layer order indicator, a first layer is ordered higher than a second layer and determining the first layer has a higher priority than the second layer or the first layer has equal priority to the second layer; or identifying, based at least in part on the layer order indicator, the first layer is ordered higher than the second layer, and determining the first layer has a lower priority than the second layer or the first layer has equal priority to the second layer.
  • Embodiment 35 The method of embodiment 33, further comprises: identifying, based at least in part on the layer order indicator, a first layer is included by the layer order indicator and a second one or more layers is precluded from the layer order indicator; and identifying the first layer has a higher priority than the second one or more layers.
  • Embodiment 36 The method of embodiment 33, further comprising: identifying a first layer and a second layer are precluded from the layer order indicator; and determining respective priorities of the first layer and the second layer based at least in part on respective indices of the first layer and the second layer, respective numbers of non-zero coefficients of the first layer and the second layer, or both.
  • the respective indices of the first layer and the second layer are based on a mapping order of each layer in the first payload of the CSI report, and the mapping comprises mapping one or more CSI components of a layer.
  • Embodiment 37 The method of embodiment 33, further comprising: determining one or more layers with a lowest priority at a particular omission level; and determining a portion of the first payload of the CSI report has been omitted based at least in part on a number of non-zero coefficients of the one or more layers with the lowest priority, where the portion is omitted from the first payload of the CSI report.
  • Embodiment 38 The method of embodiment 37, wherein the number of non-zero coefficients of each of the one or more layers with the lowest priority is determined based at least in part on a per-layer NNZC indicator in UCI part 1. Additionally or alternatively, the number of non-zero coefficients of each of the one or more layers with the lowest priority is determined based at least in part on an NNZC indicator indicating a total number of NZC across all layers in UCI part 1.
  • Embodiment 39 The method of embodiment 37, further comprising: determining a portion of the first payload of the CSI report has been omitted based at least in part on at least one of a number of frequency domain bases of the one or more layers with the lowest priority, or a bitmap used to indicate a number of non-zero coefficients indices of the one or more layers with the lowest priority, or a strongest coefficient indicator of the one or more layers with the lowest priority.
  • Embodiment 40 The method of embodiment 37, wherein the portion of the first payload that has been omitted at the particular omission level is fixed or configured via RRC, MAC CE, DCI, or any combination thereof.
  • Embodiment 41 The method of embodiment 37, further comprising: transmitting a configuration of a scaling factor; and determining the portion of the first payload has been omitted at the particular omission level based at least in part on a product of the configured scaling factor and a maximum number of non-zero coefficients reported per layer.
  • Embodiment 42 The method of any of embodiments 33 to 41, further comprising: determining one or more layers with at least a lowest priority and a second lowest priority at a particular omission level; and determining a portion of the first payload of the CSI report has been omitted, wherein the portion of the first payload of the CSI report is omitted, layer-by-layer, from a first layer of the one or more layers with the lowest priority to a second layer of the one or more layers with the second lowest priority.
  • Embodiment 43 The method of embodiment 42, wherein the portion of first payload of the CSI report that has been omitted at the particular omission level is fixed, configured via RRC, MAC CE, DCI, or any combination thereof.
  • Embodiment 44 The method of embodiment 42, wherein the portion of first payload of the CSI report that has been omitted at the particular omission level is determined based at least in part on at least one of a number of non-zero coefficients across a plurality of layers, a number of non-zero coefficients of each layer of one or more layers of the plurality of layers, or any combination thereof.
  • Embodiment 45 The method of embodiment 44, wherein: a number of non-zero coefficients across a plurality of layers is determined based at least in part on a total number of non-zero coefficients indicator reported in UCI part 1; and a number of non-zero coefficients of each layer of one or more layers of the plurality of layers is determined based at least in part on at least one of: an NNZC of a layer based at least in part on a per-layer NZC indicator in UCI part 1, or based at least in part on a number of bits having a defined value in a bitmap, wherein the bitmap is used to report indices of the NZCs of a corresponding layer.
  • Embodiment 46 The method of any of embodiments 26 to 45, wherein the CSI report further comprises at least one of a wideband CQI report, one or more subband CQI reports, or both, and wherein at least one of the wideband CQI report or the one or more subband CQI reports is calculated based at least in part on the CSI report with the first payload.
  • Embodiment 47 The method of any of embodiments 26 to 46, wherein the CSI report further comprises at least one of a wideband CQI report or one or more subband CQI reports, and wherein at least one of the wideband CQI report or the one or more subband CQI reports is calculated based at least in part on one or more layers without NZC omission in the CSI report with the second payload.
  • Embodiment 48 The method of any of embodiments 26 to 47, wherein the CSI report further comprises at least one of a wideband CQI report or one or more subband CQI reports, and wherein at least one of the wideband CQI report or the one or more subband CQI reports is calculated based at least in part on a plurality of layers reported in the CSI report with the second payload.
  • Embodiment 49 The method of any of embodiments 26 to 48, wherein the CSI report comprises a plurality of quantizations of NZCs and the omitting comprises omitting at least a subset of the plurality of quantizations of NZCs.
  • Embodiment 50 The method of any of embodiments 26 to 49, wherein the UL grant configuration being insufficient to carry the CSI report with the first payload further comprises at least one of: an allocated UL resource based at least in part on the UL grant configuration is insufficient to carry the CSI report with the first payload; a configured coding rate is insufficient to carry the CSI report with the first payload, or both.
  • Embodiment 51 An apparatus comprising at least one means for performing a method of any of embodiments 1 to 25.
  • Embodiment 52 An apparatus for wireless communications comprising a processor; memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of embodiments 1 to 25.
  • Embodiment 53 A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by a processor to perform a method of any of embodiments 1 to 25.
  • Embodiment 54 An apparatus comprising at least one means for performing a method of any of embodiments 26 to 50.
  • Embodiment 55 An apparatus for wireless communications comprising a processor; memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of embodiments 26 to 50.
  • Embodiment 56 A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by a processor to perform a method of any of embodiments 26 to 50.
  • Embodiment 57 A method for wireless communications by a UE, comprising: receiving, from a base station, a CSI report trigger and a UL grant configuration to carry a CSI report; generating a CSI report based on the CSI report configuration; identifying an CSI omission indicator to the base station, indicating that the UL grant configuration is sufficient or insufficient to carry the generated CSI report; and transmitting the CSI report including the identified CSI omission indicator.
  • Embodiment 58 The method of embodiment 57, further comprising: identifying a first payload size of the generated CSI report and identifying the UL grant configuration is insufficient; omitting a portion of the generated CSI report and identifying a second payload size of the omitted CSI report; and transmitting the CSI report including the identified CSI omission indicator.
  • Embodiment 59 The method of any of embodiments 57 or 58, wherein transmitting the CSI report including the identified CSI omission indicator further comprises: transmitting an explicit indication of the CSI omission indicator.
  • Embodiment 60 The method of embodiment 59, wherein the explicit indication is a 1-bit indicator.
  • Embodiment 61 The method of embodiment 59, wherein the CSI omission indicator further comprises: generating an indicator jointly indicating the CSI omission indicator with other indicators.
  • Embodiment 62 The method of embodiment 61, wherein the other indicators comprise a basis sufficiency indicator, the basis sufficiency indicator comprising at least one of: an indication of a sufficiency of the configured FD bases, a sufficiency of the configured SD bases, or the maximum number of NZCs configured by the base station.
  • Embodiment 63 The method of any of embodiments 57 to 62, wherein transmitting the CSI report including the identified CSI omission indicator further comprises: transmitting an RI and a per-layer NNZC; and the CSI omission indicator is identified based on RI and per-layer NNZC.
  • Embodiment 64 The method of embodiment 63, wherein the CSI omission indicator is identified based on a RI and per-layer NNZC, the method further comprising identifying CSI omission whether the RI is equal to the number of layers with non-zero coefficients based on the per-layer NNZC.
  • Embodiment 65 The method of embodiment 63, wherein the CSI omission indicator further indicates which layers are omitted based on the RI and the per-layer NNZC.
  • Embodiment 66 The method of any of embodiments 57 to 65, wherein the CSI report configuration comprises at least one of a number of one or more spatial domain basis, a number of one or more frequency domain basis for one or more layers, a max number of coefficients for each of the one or more layers, a max total number of coefficients for all layers, or any combination thereof.
  • Embodiment 67 An apparatus comprising at least one means for performing a method of any of embodiments 57 to 66.
  • Embodiment 68 An apparatus for wireless communications comprising a processor; memory in electronic communication with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of embodiments 57 to 66.
  • Embodiment 69 A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by a processor to perform a method of any of embodiments 57 to 66.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • a CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA) , etc.
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • IS-2000 Releases may be commonly referred to as CDMA2000 1X, 1X, etc.
  • IS-856 TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD) , etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • a TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA system may implement a radio technology such as Ultra Mobile Broadband (UMB) , Evolved UTRA (E-UTRA) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, etc.
  • UMB Ultra Mobile Broadband
  • E-UTRA Evolved UTRA
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Institute of Electrical and Electronics Engineers
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDM
  • UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS) .
  • LTE, LTE-A, and LTE-A Pro are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from the organization named “3rd Generation Partnership Project” (3GP
  • CDMA2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • 3GPP2 3rd Generation Partnership Project 2
  • the techniques described herein may be used for the systems and radio technologies mentioned herein as well as other systems and radio technologies. While 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 applications.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell may be associated with a lower-powered base station, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed, etc. ) frequency bands as macro cells.
  • Small cells may include pico cells, femto cells, and micro cells according to various examples.
  • a pico cell for example, may cover a small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • An eNB for a macro cell may be referred to as a macro eNB.
  • An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB.
  • An eNB may support one or multiple (e.g., two, three, four, and the like) cells, and may also support communications using one or multiple component carriers.
  • the wireless communications systems described herein may support synchronous or asynchronous operation.
  • the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time.
  • the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time.
  • the techniques described herein may be used for either synchronous or asynchronous operations.
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • 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.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional 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) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on 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 can 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.
  • 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 place to another.
  • a non-transitory storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.
  • non-transitory computer-readable media may include random-access memory (RAM) , read-only memory (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 can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • flash memory compact disk (CD) ROM or other optical disk storage
  • magnetic disk storage or other magnetic storage devices
  • any connection is properly termed a computer-readable medium.
  • 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
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des procédés, des systèmes et des dispositifs destinés aux communications sans fil. Un équipement utilisateur (UE) peut identifier un indicateur d'ordination de couche (LOI) qui indique un ordre de couches descendant, et indiquer le LOI à une station de base avant ou pendant la transmission d'un rapport d'informations d'état de canal (CSI). Dans certains cas, l'UE peut omettre un ou plusieurs coefficients à partir d'une première charge utile du rapport de CSI sur la base du LOI, et transmettre le rapport de CSI après omission du ou des coefficients à partir de la charge utile jusqu'à ce que la configuration d'autorisation de liaison montante soit suffisante pour transporter une seconde charge utile du rapport de CSI (par exemple, une charge utile maximale prise en charge pour le rapport de CSI). Sur la base du LOI, la station de base peut identifier quels coefficients ont été omis selon la règle d'omission par l'UE dans le rapport CSI pour obtenir la seconde charge utile.
PCT/CN2019/085425 2019-05-03 2019-05-03 Omission de coefficients spécifiques à la couche, basée sur une indication d'ordination de couche WO2020223837A1 (fr)

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WO2023011511A1 (fr) * 2021-08-05 2023-02-09 华为技术有限公司 Procédé de rétroaction d'informations et appareil associé
WO2024021012A1 (fr) * 2022-07-29 2024-02-01 Lenovo (Beijing) Ltd. Procédés et appareils d'omission de csi pour transmission conjointe cohérente
WO2024073882A1 (fr) * 2022-10-08 2024-04-11 Qualcomm Incorporated Codage et décodage de sélection de base de domaine spatial pour communication à multiples points d'émission-réception
WO2024172716A1 (fr) * 2023-02-16 2024-08-22 Telefonaktiebolaget Lm Ericsson (Publ) Configuration d'un dispositif sans fil avec une taille de charge utile de csi

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US20110269490A1 (en) * 2010-04-30 2011-11-03 Mark Earnshaw System and method for channel state feedback in carrier aggregation
WO2012024181A1 (fr) * 2010-08-16 2012-02-23 Qualcomm, Inc. Renvoi d'informations d'état de voie par rétroaction dans un système à agrégation de porteuses
WO2015099515A1 (fr) * 2013-12-27 2015-07-02 Lg Electronics Inc. Procédé et appareil de rapport d'informations d'état de canal

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US20110269490A1 (en) * 2010-04-30 2011-11-03 Mark Earnshaw System and method for channel state feedback in carrier aggregation
WO2012024181A1 (fr) * 2010-08-16 2012-02-23 Qualcomm, Inc. Renvoi d'informations d'état de voie par rétroaction dans un système à agrégation de porteuses
WO2015099515A1 (fr) * 2013-12-27 2015-07-02 Lg Electronics Inc. Procédé et appareil de rapport d'informations d'état de canal

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023011511A1 (fr) * 2021-08-05 2023-02-09 华为技术有限公司 Procédé de rétroaction d'informations et appareil associé
WO2024021012A1 (fr) * 2022-07-29 2024-02-01 Lenovo (Beijing) Ltd. Procédés et appareils d'omission de csi pour transmission conjointe cohérente
WO2024073882A1 (fr) * 2022-10-08 2024-04-11 Qualcomm Incorporated Codage et décodage de sélection de base de domaine spatial pour communication à multiples points d'émission-réception
WO2024172716A1 (fr) * 2023-02-16 2024-08-22 Telefonaktiebolaget Lm Ericsson (Publ) Configuration d'un dispositif sans fil avec une taille de charge utile de csi

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