WO2020061981A1 - Rapport de csi avec livre-code de rang élevé de type ii - Google Patents

Rapport de csi avec livre-code de rang élevé de type ii Download PDF

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Publication number
WO2020061981A1
WO2020061981A1 PCT/CN2018/108176 CN2018108176W WO2020061981A1 WO 2020061981 A1 WO2020061981 A1 WO 2020061981A1 CN 2018108176 W CN2018108176 W CN 2018108176W WO 2020061981 A1 WO2020061981 A1 WO 2020061981A1
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WIPO (PCT)
Prior art keywords
beams
layers
orthogonal
csi report
layer
Prior art date
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PCT/CN2018/108176
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English (en)
Inventor
Liangming WU
Chenxi HAO
Yu Zhang
Qiaoyu Li
Chao Wei
Wanshi Chen
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2018/108176 priority Critical patent/WO2020061981A1/fr
Publication of WO2020061981A1 publication Critical patent/WO2020061981A1/fr

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    • 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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • 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
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • 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

Definitions

  • aspects of the present disclosure generally relate to wireless communication, and to techniques and apparatuses for Type II high-rank codebook channel state information (CSI) reporting.
  • CSI channel state information
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc. ) .
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) .
  • LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) .
  • a user equipment (UE) may communicate with a base station (BS) via the downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , anew radio (NR) BS, a5G Node B, and/or the like.
  • New radio which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • CP-OFDM with a cyclic prefix
  • SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • MIMO multiple-input multiple-output
  • a method for wireless communication may include selecting a first set of beams and a second set of beams to be identified in a channel state information (CSI) report, wherein the first set of beams are associated with a first set of layers, and wherein the second set of beams are associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams; and transmitting the CSI report comprising an indication of at least one of the first set of beams or the second set of beams.
  • CSI channel state information
  • a user equipment for wireless communication may include memory and one or more processors configured to select a first set of beams and a second set of beams to be identified in a channel state information (CSI) report, wherein the first set of beams are associated with a first set of layers, and wherein the second set of beams are associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams; and transmit the CSI report comprising an indication of at least one of the first set of beams or the second set of beams.
  • CSI channel state information
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of a user equipment, may cause the one or more processors to select a first set of beams and a second set of beams to be identified in a channel state information (CSI) report, wherein the first set of beams are associated with a first set of layers, and wherein the second set of beams are associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams; and transmit the CSI report comprising an indication of at least one of the first set of beams or the second set of beams.
  • CSI channel state information
  • an apparatus for wireless communication may include means for selecting a first set of beams and a second set of beams to be identified in a channel state information (CSI) report, wherein the first set of beams are associated with a first set of layers, and wherein the second set of beams are associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams; and means for transmitting the CSI report comprising an indication of at least one of the first set of beams or the second set of beams.
  • CSI channel state information
  • a method for wireless communication may include identifying a first set of beams and a second set of beams based at least in part on an indication in a channel state information (CSI) report, wherein the first set of beams is associated with a first set of layers, and wherein the second set of beams is associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams; and performing a transmission based at least in part on the CSI report.
  • CSI channel state information
  • a base station for wireless communication may include memory and one or more processors configured to identify a first set of beams and a second set of beams based at least in part on an indication in a channel state information (CSI) report, wherein the first set of beams is associated with a first set of layers, and wherein the second set of beams is associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams; and perform a transmission based at least in part on the CSI report.
  • CSI channel state information
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of a base station, may cause the one or more processors to identify a first set of beams and a second set of beams based at least in part on an indication in a channel state information (CSI) report, wherein the first set of beams is associated with a first set of layers, and wherein the second set of beams is associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams; and perform a transmission based at least in part on the CSI report.
  • CSI channel state information
  • an apparatus for wireless communication may include means for identifying a first set of beams and a second set of beams based at least in part on an indication in a channel state information (CSI) report, wherein the first set of beams is associated with a first set of layers, and wherein the second set of beams is associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams; and means for performing a transmission based at least in part on the CSI report.
  • CSI channel state information
  • Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a user equipment (UE) in a wireless communication network, in accordance with various aspects of the present disclosure.
  • UE user equipment
  • Fig. 3 is a diagram illustrating an example of selection and indication of beams for a plurality of layers using linear combination and beam selection, in accordance with various aspects of the present disclosure.
  • Fig. 4 is a diagram illustrating an example process performed, for example, by a user equipment, in accordance with various aspects of the present disclosure.
  • Fig. 5 is a diagram illustrating an example process performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • a BS may transmit many beams to a UE (e.g., UE 120) .
  • the BS may use an antenna panel that generates beams at a geometric displacement from each other.
  • the BS and the UE may select a set of beams that are to be used for communication between the BS and the UE.
  • the set of beams transmitted from the BS to the UE may be referred to herein as a communication link, a downlink, and/or the like.
  • the UE may select a set of beams, of a plurality of beams, transmitted by the BS. For example, the UE may select the set of beams based at least in part on the set of beams being associated with favorable characteristics (e.g., a satisfactory receive power, signal to interference plus noise (SINR) value, etc. ) .
  • the set of beams may be orthogonal to each other (e.g., may be associated with an orthogonal basis) .
  • the UE may provide information indicating the set of beams and parameters to be used for generating the set of beams using a codebook.
  • One such codebook is the Type II codebook, prescribed in 5G/NR.
  • the UE may provide the information indicating the set of beams in a channel state information (CSI) report, such as a Type II CSI report when using the Type II codebook.
  • CSI channel state information
  • the Type II CSI report may identify a precoder preferred by the UE.
  • the Type II CSI report may support up to two layers (e.g., Rank 2) , and each layer maybe a linear combination of at least some of the beams described above.
  • the UE may report the rank, a channel quality indicator (CQI) , the beams to be used for the linear combination, and the coefficients to be used for each layer.
  • CQI channel quality indicator
  • the Type II CSI report may include a first part and a second part, referred to in some cases herein as Part I and Part II.
  • Part I may identify the rank indicator, the channel quality indicator, and the number of non-zero-amplitude coefficients per layer.
  • Part I may have a fixed payload size. The number of non-zero-amplitude coefficients may be used to determine the payload of Part II. For example, in the case of a Rank 1 configuration, the UE may report non-zero-amplitude coefficients for a single layer, and in the case of a Rank 2 configuration, the UE may report non-zero-amplitude coefficients for each layer of two layers associated with the Rank 2 configuration.
  • Part II may indicate the beams used for linear combination, and the non-zero amplitude coefficients for each layer.
  • the network may configure the UE to report 2, 3, or 4 beams (or more) to be used in linear combination.
  • the UE may report a value indicating the selection results of L beams out of the total number of beams.
  • the above CSI reporting configuration may be used for Rank 1 or Rank 2 communications. It may be beneficial to provide CSI feedback for higher-rank communications (e.g., Rank 3, Rank 4, and so on) . In such a case, if all layers are formed by linear combination of beams, the payload size of part II CSI will be very large. Hence, in order to save overhead in CSI report, one or more first layers may use a linear combination approach, and one or more second (e.g., higher) layers may use a beam-selection approach, wherein one or more respective beams (e.g., a single beam) are selected for each layer of the one or more second layers.
  • first layers may use a linear combination approach
  • one or more second (e.g., higher) layers may use a beam-selection approach, wherein one or more respective beams (e.g., a single beam) are selected for each layer of the one or more second layers.
  • Some techniques and apparatuses described herein provide a signaling design for CSI reporting for higher-rank communications using a Type II codebook. For example, some techniques and apparatuses described herein may select a first set of beams to be used for linear combination for a first set of layers. Some techniques and apparatuses described herein may select a second set of beams to be used for a second set of layers (e.g., one beam per layer of the second set of layers) . In some aspects, the second set of beams may be selected from the first set of beams, and coefficients for the second set of layers may be derived from coefficients of the first set of layers, which conserves signaling resources that would otherwise be used to indicate the coefficients for the second set of layers. In some aspects, the second set of beams may be orthogonal to the first set of beams, and coefficients of the second set of beams may be reported to the base station. In some aspects, the second set of beams may be selected using a combination of the above techniques.
  • some techniques and apparatuses described herein may report the orthogonal beams of the second set of beams. Additionally, or alternatively, some techniques and apparatuses described herein may report a set of beams that includes the first set of beams and the second set of beams, and may report which beams are to be used for the first set of beams.
  • some techniques and apparatuses described herein may determine and report a number of layers in the first set of layers and the second set of layers.
  • the respective numbers of layers in the first set of layers and the second set of layers may include 1+2, 1+3, 2+1, 2+2, and so on.
  • Some techniques and apparatuses described herein may use a rank indicator to indicate the total number of layers, and may use the total number of non-zero-amplitude coefficients per layer to indicate the number of layers in the first set of layers. For example, when there are two layers having non-zero-amplitude coefficients, this may indicate that there are two layers in the first set of layers, and when there is one layer with non-zero-amplitude coefficients, this may indicate that there is one layer in the first set of layers.
  • flexible allocation of linear combination layers and beam selection layers may be provided, and may be signaled to the base station. In this way, CSI reporting is achieved for communications having a rank higher than 2 using a combination of linear combination and beam selection.
  • aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.
  • Fig. 1 is a diagram illustrating a network 100 in which aspects of the present disclosure may be practiced.
  • the network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • Wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , and/or the like.
  • Each BS may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • eNB base station
  • NR BS NR BS
  • gNB gNode B
  • AP AP
  • node B node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the access network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • Wireless network 100 may also include relaystations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, etc.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc.
  • a UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, such as sensors, meters, monitors, location tags, etc., that may communicate with a base station, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE) .
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular RAT and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a frequency channel, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • a scheduling entity e.g., a base station
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs) . In this example, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • P2P peer-to-peer
  • mesh network UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • a scheduling entity and one or more subordinate entities may communicate utilizing the scheduled resources.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another) .
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like) , a mesh network, and/or the like.
  • V2X vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • Fig. 1 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 1.
  • Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) , etc. ) and control information (e.g., CQI requests, grants, upper layer signaling, etc. ) and provide overhead symbols and control symbols.
  • MCS modulation and coding schemes
  • Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS) ) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • TX transmit
  • MIMO multiple-input multiple-output
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , etc.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of UE 120 may be included in a housing.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, etc. ) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc. ) , and transmitted to base station 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, etc.
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with selection and indication of beams for a plurality of layers using linear combination and beam selection, as described in more detail elsewhere herein.
  • controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 400 of Fig. 4, and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • the stored program codes when executed by processor 280 and/or other processors and modules at UE 120, may cause the UE 120 to perform operations described with respect to process 400 of Fig. 4, and/or other processes as described herein.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • UE 120 may include means for selecting a first set of beams and a second set of beams to be identified in a channel state information (CSI) report; means for transmitting the CSI report comprising an indication of at least one of the first set of beams or the second set of beams; means for selecting one or more respective beams, from the first set of beams, for one or more layers of the second set of layers; means for reporting the one or more respective beams from the first set of beams in the CSI report; means for using a dominant beam of the first set of beams for a particular layer of the second set of layers; means for selecting, for one or more other layers of the second set of layers other than the particular layer, one or more respective beams of the first set of beams, other than the dominant beam; means for reporting at least the one or more respective beams from the first set of beams in the CSI report; means for selecting, for one or more layers of the second set of layers, one or more respective beams orthogonal to the first set of beams; means for transmitting CSI report
  • BS 110 may include means for identifying a first set of beams and a second set of beams based at least in part on an indication in a channel state information (CSI) report, wherein the first set of beams is associated with a first set of layers, and wherein the second set of beams is associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams; means for performing a transmission based at least in part on the CSI report; means for identifying respective beam indexes of the one or more respective beams using a table that identifies beam indexes of beams of a beam group based at least in part on a value of the indicator of the CSI report; means for determining sub-band indexes of the one or more respective beams based at least in part on the respective beam indexes; means for identifying respective beam indexes of the selected set of beams or the one
  • While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components.
  • the functions described with respect to the transmit processor 264, the receive processor 258, and/or the TX MIMO processor 266 may be performed by or under the control of processor 280.
  • Fig. 2 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 2.
  • Fig. 3 is a diagram illustrating an example 300of selection and indication of beams for a plurality of layers using linear combination and beam selection, in accordance with various aspects of the present disclosure.
  • a BS 110 may provide (e.g., transmit) a plurality of beams.
  • the plurality of beams may be associated with an orthogonal basis.
  • the plurality of beams may be associated with an orthogonal 2D-DFT beam group.
  • the plurality of beams may be selected from a larger set of beams.
  • the UE 120 may select L beams from a total number of beams transmitted by the BS 110, wherein the L beams are of an orthogonal set of beams.
  • the plurality of beams may carry a reference signal, such as a CSI reference signal and/or the like. The UE 120 may identify the plurality of beams and/or the CSI report based at least in part on the reference signals.
  • the UE 120 may determine a number of linear combination layers and a number of beam selection layers to be indicated in a CSI report.
  • a set of linear combination layers e.g., a first set of layers
  • a set of beam selection layers e.g., a second set of layers
  • a linear combination layer may be associated with higher overhead than a beam selection layer, and may provide better precision and/or performance.
  • a beam selection layer may be associated with less overhead than a linear combination layer at the cost of lower precision and/or performance.
  • the UE 120 may determine a rank to be requested as part of the CSI report.
  • the rank may include a rank of 1, 2, 3, 4, or a higher value.
  • the UE 120 may determine the number of linear combination layers and/or the number of beam selection layers based at least in part on the rank.
  • the UE 120 may determine the rank based at least in part on the number of linear combination layers and/or beam selection layers.
  • the UE 120 may determine the rank, the number of linear combination layers, and/or the number of beam selection layers based at least in part on channel conditions, based at least in part on information received from the BS 110, and/or the like.
  • the UE 120 may select a first set of beams for one or more linear combination layers. For example, the UE 120 may determine the first set of beams from the plurality of beams. In some aspects, the first set of beams may include two beams, three beams, four beams, or a larger number of beams. In some aspects, the number of beams in the first set of beams may be based at least in part on a configuration, such as a configuration provided by BS 110 and/or the like.
  • the UE 120 may determine coefficients for the first set of beams.
  • the coefficients may indicate amplitude for each beam of the plurality of beams, phase for each beam of the plurality of beams, and/or the like.
  • the UE 120 may provide the coefficients for the first set of beams to the BS 110 using the CSI report, as described in more detail below.
  • the first set of beams may be used for a first linear combination layer and a second linear combination layer. In such a case, linear combination for the first linear combination layer may be performed for the first set of beams based at least in part on a first set of coefficients (corresponding to the first linear combination layer) and a second set of coefficients (corresponding to the second linear combination layer) .
  • the UE 120 may determine the CSI feedback for the first set of beams based at least in part on a precoder structure.
  • the CSI feedback may identify a preferred precoder for the UE 120 based at least in part on a precoding matrix indicator (PMI) codebook.
  • PMI codebook may assume the following precoder structure for Rank 3 and for Rank 4:
  • the linear combination layers may use a Type II linear combination codebook similar to the one used in Release 15. This may save overhead and may be helpful for construction of beams for the beam selection layers, as described in more detail below.
  • the UE 120 may select a second set of beams for a set of beam selection layers.
  • the second set of beams may be selected from the first set of beams.
  • the UE 120 may select a beam, of the second set of beams, for each layer of the two or more beam selection layers.
  • the second set of beams may be selected from the plurality of beams and not from the first set of beams.
  • the second set of beams may be from the plurality of beams and not the L linear combination beams.
  • one or more beams, of the second set of beams may be from the first set of beams, and one or more beams, of the second set of beams, may not be from the first set of beams.
  • a beam for a beam selection layer may be selected from the first set of beams. For example, for Rank 3 and one linear combination layer or Rank 4 and two linear combination layers, 2 beams may be selected from the first set of beams, which may use at least bits in the CSI report. For Rank 4 and one linear combination layer, three beams maybe selected from the first set of beams, which may use at least bits in the CSI report.
  • a beam for the beam selection layer may be indicated as: wherein is selected from the first set of beams.
  • a dominant beam from the linear combination layer may be pre-indicated.
  • the dominant beam may be selected for a beam selection layer (e.g., a particular layer of the second set of layers) , or may be enforced for selection for the beam selection layer.
  • a beam selection layer e.g., a particular layer of the second set of layers
  • one other beam, of the first set of beams and other than the dominant beam may be selected for another layer of the second set of layers. This may use at least in the CSI report.
  • two other beams, of the first set of beams and other than the dominant beam may be selected for other layers of the second set of layers.
  • the UE 120 may determine coefficients for the beams of the beam selection layer (s) .
  • the UE 120 may determine the coefficients based at least in part on coefficients of the first set of beams (e.g., for the one or more linear combination layers) .
  • the UE 120 may not need to report the coefficients to the BS 110, thereby conserving resources.
  • the phase and amplitude coefficients for the beam selection layer (s) may be defined as follows:
  • the UE 120 may select one or more beams not of the first set of beams for the second set of beams.
  • the beam for the beam selection layer may be indicated as follows: wherein is selected from the same orthogonal beam group and is not included in the first set of beams.
  • a quantization e.g., at a quadrature phase shift keying or 8-phase shift keying granularity
  • the UE 120 may select one or more beams from the first set of beams and one or more beams not from the first set of beams for the second set of beams.
  • the beams may be indicated as follows:
  • beams may be selected from the first set of beams (e.g., the L linear combination beams) associated with the first set of layers.
  • Beam selection, amplitude feedback, and phase feedback may be provided similarly as for the case wherein all beams of the second set of beams are selected from the first set of beams, as described above.
  • beams may be selected from the orthogonal beam group (e.g., the plurality of beams) and may not be selected from the first set of beams. Beam selection, amplitude feedback, and phase feedback for these beams may be provided similarly as for the case wherein all beams of the second set of beams are not selected from the first set of beams, as described above.
  • the UE 120 may transmit a CSI report that identifies the layers and the beams.
  • the CSI report may include a Part I and a Part II.
  • Part I may identify a rank indicator (e.g., a total number of layers) , a channel quality indicator, and a number of non-zero-amplitude coefficients for a first layer and a second layer of the first set of layers and the second set of layers.
  • Part II may identify PMIs for the beams, the payload of which may be determined based at least in part on Part I of the CSI report, as described in more detail below.
  • the number of non-zero-amplitude coefficients identified by Part I may indicate whether the second layer is of the first set of layers or the second set of layers. For example, when the number of non-zero-amplitude coefficients per layer indicates that there are two layers having at least one non-zero-amplitude coefficient (e.g., two layers configured for linear combination) , this may indicate that there are two layers in the first set of layers. When the number of non-zero-amplitude coefficients per layer indicates that there is one layer having at least one non-zero-amplitude coefficient (e.g., one layer configured for linear combination) , this may indicate that there is one layer in the first set of layers. Thus, the UE 120 may indicate whether one linear combination layer or two linear combination layers is to be used.
  • the CSI report may explicitly identify a beam group (e.g., used for the second set of layers.
  • the CSI report may identify PMIs for the first set of beams and coefficients for the PMIs for the first set of beams.
  • the rank indicator is greater than or equal to 3
  • Part II may explicitly identify the beam group.
  • this indication may be used for one beam with bits (e.g., for both layer 3 and 4 if the number of non-zero amplitude coefficients for layer 2 is not equal to zero, or for both layer 2 and 3 if the number of non-zero amplitude coefficients for layer 2 is equal to zero) , or may be used for two beams with bits (e.g., one beam for layer 3, and another beam for layer 4, if the number of non-zero-amplitude coefficients for layer 2 is not equal to zero, or one beam for layer 2, and another beam for layer 3, if the number of non-zero-amplitude coefficients for layer 2 is equal to zero) .
  • An example table for determining the explicit indication is provided below.
  • the CSI report may jointly indicate the first set of beams and the second set of beams.
  • the CSI report may include a first indication that explicitly indicates a beam group, that includes all beams used for the first set of layers (e.g., the linear combination layers) , and all beams used for the second set of layers (e.g., the beam selection layers) .
  • the UE 120 may provide a second indication that indicates which beams from the explicitly indicated beam group are used for the first set of layers (e.g., the beam combination layers) , which may implicitly indicate that the remaining beams of the beam group are used for the second set of layers. For example, the UE 120 may use a bitmap wherein a particular value indicates that the corresponding beam is used for the first set of layers.
  • the UE 120 may provide a second indication that indicates active beams per layer, of the first set of layers and the second set of layers. For example, the UE 120 may indicate multiple active beams per beam combination layer, and may indicate a single active beam per beam selection layer.
  • the first indication and the second indication may be transmitted in CSI report Part II.
  • the payload of CSI report Part II may be based at least in part on the rank indicator in CSI report Part I, as described in more detail above.
  • the UE 120 may determine an explicit indication of a beam group based at least in part on a set of rules or values, such as a table.
  • a table One possible example of such a table, and a procedure for determining an explicit indication based at least in part on the table, is provided below:
  • a beam group containing L beams out of N beams may be indicated using an index in the range of The index may be determined, for example, based at least in part on the following procedure and with reference to the above table.
  • the beam group may not always include beams selected for linear combination.
  • the first set of beams and the beams orthogonal to the first set of beams are indicated separately. That is, when indicating the beams orthogonal to the first set of beams, the first set of beams shall not be counted.
  • n 1 ⁇ n 2 ⁇ ... ⁇ n L determines a first value from a first row of the table based at least in part on the smallest beam index n 1 , determine a second value from a second row of a table based at least in part on the second smallest beam index n 2 , and so on, until determining an L-th value from the L-th row of the table based at least in part on the largest beam index n L .
  • the UE 120 may determine a summation of all L values to determine the final index (e.g., the explicit indicator) for the beam group.
  • the BS 110 may determine a communication configuration based at least in part on the CSI report. For example, the BS 110 may determine a beam configuration (e.g., using one or more linear combination layers and one or more beam selection layers) for transmission of a communication to the UE 120. In some aspects, the BS 110 may perform beamforming based at least in part on the CSI report. In some aspects, the BS 110 may transmit a CSI reference signal based at least in part on the CSI report.
  • a beam configuration e.g., using one or more linear combination layers and one or more beam selection layers
  • the BS 110 may identify the beams of a beam group (e.g., one or more beams for the first set of beams and/or one or more beams for the second set of beams) based at least in part on an explicit indicator. For example, the BS 110 may use the table described above (or a similar table) and may determine a group of L out of M beams in accordance with an index value received by the BS 110 based at least in part on the following process. From the Lth row of the table, the BS 110 may find the greatest value that is not greater than the received beam group index z. An index n L of the greatest value identifies a beam of the beam group.
  • the BS 110 may determine the greatest value, that is not greater than the beam group index z-g L (n L ) , wherein g L (n L ) is the greatest value found in the previous iteration (for the Lth row of the table) .
  • the index n L-1 of the greatest value corresponds to another beam of the beam group.
  • the BS 110 may determine the greatest value that is not greater than beam group index z-g L (n L ) -g L-1 (n L-1 ) , where g L (n L )and g L-1 (n L-1 ) are the greatest value found in the previous two iterations (e.g., for the Lth and L-1th rows of the table) , respectively.
  • the index n L-2 of the greatest value corresponds to a third beam of the group.
  • the BS 110 may repeat this procedure until step L, at the last row of the table.
  • the BS 110 may find the greatest value, of the last row of the table, that is not greater than beam group index where g l (n l ) is the greatest value found in step L-l+1.
  • the index n 1 of the greatest value corresponds to a final beam of the beam group.
  • the BS 110 may determine a set of beams for a set of beam selection layers, or for a set of linear combination layers and beam selection layers, using an index value received from the UE 120. In some aspects, the BS 110 may determine whether a beam of the identified set of beams is associated with a beam selection layer or a linear combination layer based at least in part on a bitmap, an indication of active beams per layer, and/or the like.
  • Fig. 3 is provided as an example. Other examples are possible and may differ from what was described with respect to Fig. 3.
  • Fig. 4 is a diagram illustrating an example process 400performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Example process 400 is an example where a UE (e.g., UE 120) performs selection and indication of beams for a plurality of layers using linear combination and beam selection.
  • a UE e.g., UE 120
  • process 400 may include selecting a first set of beams and a second set of beams to be identified in a channel state information (CSI) report, wherein the first set of beams is associated with a first set of layers, and wherein the second set of beams is associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams (block 410) .
  • the UE e.g., using controller/processor 280 and/or the like
  • the first set of beams may be associated with a first set of layers.
  • the first set of beams may be linear combination beams for one or more linear combination layers.
  • the second set of beams may be associated with a second set of layers.
  • the second set of beams may be selected for one or more beam selection layers.
  • the second set of beams may comprise at least one of one or more beams of the first set of beams or a set of beams orthogonal to the first set of beams.
  • process 400 may include transmitting the CSI report comprising an indication of at least one of the first set of beams or the second set of beams (block 420) .
  • the UE e.g., using controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, and/or the like
  • the CSI report may include an indication of at least one of the first set of beams or the second set of beams.
  • Process 400 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • each layer, of the first set of layers comprises a linear combination of the first set of beams.
  • each layer, of the second set of layers comprises a beam of the second set of beams or a linear combination of the second set of beams.
  • the UE may select one or more respective beams, from the first set of beams, for one or more layers of the second set of layers; and report the one or more respective beams from the first set of beams in the CSI report.
  • the UE may use a dominant beam of the first set of beams for a particular layer of the second set of layers; select, for one or more other layers of the second set of layers other than the particular layer, one or more respective beams of the first set of beams, other than the dominant beam; and report at least the one or more respective beams from the first set of beams in the CSI report.
  • the UE may select, for one or more layers of the second set of layers, one or more respective beams orthogonal to the first set of beams; and transmit information indicating the one or more respective beams orthogonal to the first set of beams in the CSI report.
  • the first set of beams and the set of beams orthogonal to the first set of beams are from a same orthogonal beam group, and the set of beams orthogonal to the first set of beams shares no beam with the first set of beams.
  • the UE may order the one or more respective beams based at least in part on indexes of the one or more respective beams; determine a first value from a table based at least in part on an order of a first beam, of the one or more respective beams, and an index of the first beam; determine a second value from the table based at least in part on an order of a second beam, of the selected beams, and an index of the second beam; and transmit the information indicating the one or more respective beams based at least in part on at least in part on a summation of the first value and the second value.
  • the UE may select a set of beams from an orthogonal beam group; determine that one or more beams from the selected set of beams are included in the first set of beams; determine that one or more remaining beams of the selected set of beams are included in the second set of beams; and transmit, in the CSI report, a first indication indicating the selected set of beams and a second indication indicating at least the one or more beams from the selected set of beams to be included in the first set of beams.
  • the second indication comprises an indication of one or more active beams for each layer of the first set of layers and the second set of layers.
  • the UE may order beams of the selected set of beams based at least in part on indexes of the beams; determine a first value from a table based at least in part on an order of a first beam, of the beams, and an index of the first beam; determine a second value from the table based at least in part on an order of a second beam, of the beams, and an index of the second beam; and transmit the indication based at least in part on at least in part on a summation of the first value and the second value.
  • the UE may determine that the second set of beams comprises the one or more beams of the first set of beams; and determine, for one or more layers of the second set of layers, coefficients of the one or more beams of the first set of beams based at least in part on coefficients of the one or more beams of the first set of beams used in the first set of layers.
  • the UE may determine that the second set of beams comprises the set of beams orthogonal to the first set of beams; determine, for one or more layers of the second set of layers, coefficients applied to the set of beams orthogonal to the first set of beams; and report the coefficients in the CSI report.
  • the coefficient indicates at least one of an amplitude or a phase, wherein the amplitude or the phase is based at least in part on a quantization.
  • the CSI report further comprises at least one of rank indicator, a channel quality indicator for a codeword of the CSI report, the indication of the first set of beams, a number of non-zero-amplitude coefficients per layer of the first set of layers, information identifying amplitudes of the first set of beams per layer of the first set of layers, or information identifying phases of the first set of beams per layer of the first set of layers.
  • the UE may transmit, in the CSI report, a rank indicator indicating a total number of layers of the first set of layers and the second set of layers; and transmit, in the CSI report, information indicating a number of layers of the first set of layers; and determine remaining layers, of the first set of layers and the second set of layers, as the second set of layers.
  • the information indicating the number of layers of the first set of layers identifies a number of non-zero-amplitude coefficients per layer.
  • the UE may determine that a layer is associated with no non-zero-amplitude coefficients; and determine that the layer is excluded from the first set of layers based at least in part on the layer being associated with no non-zero-amplitude coefficients.
  • process 400 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 4. Additionally, or alternatively, two or more of the blocks of process 400 may be performed in parallel.
  • Fig. 5 is a diagram illustrating an example process 500 performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • Example process 500 is an example where a base station (e.g., BS 110) performs a transmission based at least in part on an indication of beams for a plurality of layers using linear combination and beam selection.
  • a base station e.g., BS 110
  • process 500 may include identifying a first set of beams and a second set of beams based at least in part on an indication in a channel state information (CSI) report, wherein the first set of beams is associated with a first set of layers, and wherein the second set of beams is associated with a second set of layers, wherein the second set of beams comprises at least one of: one or more beams of the first set of beams, or a set of beams orthogonal to the first set of beams (block 510) .
  • CSI channel state information
  • the base station may identify a first set of beams and a second set of beams based at least in part on a CSI report.
  • the first set of beams maybe associated with a first set of layers.
  • the first set of beams may be linear combination beams for one or more linear combination layers.
  • the second set of beams may be associated with a second set of layers.
  • the second set of beams may be selected for one or more beam selection layers.
  • the second set of beams may comprise at least one of one or more beams of the first set of beams or a set of beams orthogonal to the first set of beams.
  • process 500 may include performing a transmission based at least in part on the CSI report (block520) .
  • the base station e.g., using controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and/or the like
  • may perform a transmission e.g., of a communication, a channel state information reference signal, or another transmission
  • the base station may perform the transmission using the first set of beams and the second set of beams.
  • the base station may perform the transmission using one or more beams that are determined based at least in part on the first set of beams and the second set of beams.
  • Process 500 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • each layer, of the first set of layers comprises a linear combination of the first set of beams.
  • each layer, of the second set of layers comprises a beam of the second set of beams or a linear combination of the second set of beams.
  • the beam of the second set of beams is selected from the first set of beams or the set of beams orthogonal to the first set of beams.
  • the second set of beams includes one beam from the first set of beams and one or more beams orthogonal to the first set of beams.
  • the base station may receive, in the CSI report, an indication of one or more respective beams, from the first set of beams, are used for one or more layers of the second set of layers.
  • the base station may receive, in the CSI report, an indication of a dominant beam of the first set of beams for a particular layer of the second set of layers, and an indication of one or more respective beams of the first set of beams, other than the dominant beam for one or more other layers of the second set of layers other than the particular layer.
  • the base station may receive, in the CSI report, an indication of one or more respective beams orthogonal to the first set of beams are used for one or more layers of the second set of layers.
  • the first set of beams and the set of beams orthogonal to the first set of beams are from a same orthogonal beam group, and the set of beams orthogonal to the first set of beams shares no beam with the first set of beams.
  • the base station may identify respective beam indexes of the one or more respective beams using a table that identifies beam indexes of beams of a beam group based at least in part on a value of the indicator of the CSI report.
  • the base station may identify, in a row or column of the table corresponding to an order of a beam with a greatest index of the table, a first greatest value that is less than or equal to the value of the indicator; determining an index of the beam with the greatest index of the table based at least in part on an index of the row or column that includes the first greatest value; updating the value of the indicator, as an updated value, by subtracting the first greatest value from the indicator; identifying, in another row or column corresponding to an order of a beam with a second greatest index of the table, another greatest value that is less than or equal to the updated value of the indicator; determining an index of the beam with the second greatest index based at least on part on the other row or column index of the other greatest value; and updating the updated value of the indicator by subtracting the other greatest value from the indicator to identify indexes of remaining beams, of the one or more respective beams, that have smaller indexes than the beam with the second greatest index of the table.
  • the base station may determine sub-be
  • the CSI report includes a first indication indicating a selected set of beams from an orthogonal beam group, wherein one or more beams from the selected set of beams are included in the first set of beams, wherein one or more remaining beams of the selected set of beams, other than the one or more beams from the selected set of beams, are included in the first set of beams, and the CSI report includes a second indication indicating the one or more beams from the selected set of beams that are included in the first set of beams.
  • the second indication comprises an indication of one or more active beams for each layer of the first set of layers and the second set of layers.
  • the base station may identify respective beam indexes of the selected set of beams or the one or more beams from the selected set of beams using a table that identifies beam indexes of beams of a beam group based at least in part on a value of the indicator of the CSI report.
  • the base station may identify, in a row or column of the table corresponding to an order of a beam with a greatest index of the table, a first greatest value that is less than or equal to the value of the indicator; determine an index of the beam with the greatest index of the table based at least in part on an index of the row or column that includes the first greatest value; update the value of the indicator, as an updated value, by subtracting the first greatest value from the indicator; identify, in another row or column corresponding to an order of a beam with a second greatest index of the table, another greatest value that is less than or equal to the updated value of the indicator; determine an index of the beam with the second greatest index based at least on part on the other row or column index of the other greatest value; and update the updated value of the indicator by subtracting the other greatest value from the indicator to identify indexes of remaining beams, of the selected set of beams or the one or more beams from the selected set of beams, that have smaller indexes than the beam with the second greatest index of the table.
  • the second set of beams comprises at least the one or more beams of the first set of beams
  • the CSI report indicates, for one or more layers of the second set of layers, coefficients of the one or more beams of the first set of beams based at least in part on coefficients of the one or more beams of the first set of beams used in the first set of layers, wherein the coefficients of the one or more beams of the first set of beams used in the first set of layers are indicated in the CSI report.
  • the second set of beams comprises at least the set of beams orthogonal to the first set of beams
  • the CSI report indicates, for one or more layers of the second set of layers, coefficients applied to the set of beams orthogonal to the first set of beams.
  • the coefficient indicates at least one of an amplitude or a phase, wherein the amplitude or the phase is based at least in part on a quantization.
  • the CSI report further comprises at least one of rank indicator, a channel quality indicator for a codeword of the CSI report, the indication of the first set of beams, a number of non-zero-amplitude coefficients per layer of the first set of layers, information identifying amplitudes of the first set of beams per layer of the first set of layers, or information identifying phases of the first set of beams per layer of the first set of layers.
  • the CSI report indicates a rank indicator indicating a total number of layers of the first set of layers and the second set of layers, and the CSI report indicates information indicating a number of layers of the first set of layers.
  • the base station may determine remaining layers, of the first set of layers and the second set of layers, as the second set of layers.
  • the information indicating the number of layers of the first set of layers is based at least in part on a number of non-zero-amplitude coefficients per layer.
  • the base station may determine that a layer is associated with no non-zero-amplitude coefficients; and determine that the layer is excluded from the first set of layers based at least in part on the layer being associated with no non-zero-amplitude coefficients.
  • process 500 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 5. Additionally, or alternatively, two or more of the blocks of process 500 may be performed in parallel.
  • the term component is intended to be broadly construed as hardware, firmware, or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, or a combination of hardware and software.
  • satisfying a threshold may refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .

Landscapes

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

Abstract

Divers aspects de la présente invention concernent de manière générale la communication sans fil. Selon certains aspects, un équipement utilisateur peut : sélectionner un premier ensemble de faisceaux et un second ensemble de faisceaux devant être identifiés dans un rapport d'informations d'état de canal (CSI), le premier ensemble de faisceaux étant associé à un premier ensemble de couches, et le second ensemble de faisceaux étant associé à un second ensemble de couches, le second ensemble de faisceaux comprenant un ou plusieurs faisceaux du premier ensemble de faisceaux et/ou un ensemble de faisceaux orthogonal au premier ensemble de faisceaux; et transmettre le rapport de CSI avec une indication du premier ensemble de faisceaux et/ou du second ensemble de faisceaux. L'invention se présente également sous de nombreux autres aspects.
PCT/CN2018/108176 2018-09-28 2018-09-28 Rapport de csi avec livre-code de rang élevé de type ii WO2020061981A1 (fr)

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WO2020194279A1 (fr) * 2019-03-28 2020-10-01 Lenovo (Singapore) Pte. Ltd. Procédé et appareil pour générer un rapport d'informations d'état de canal
WO2024060255A1 (fr) * 2022-09-23 2024-03-28 Nec Corporation Procédés, dispositifs et support de communication

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CN105917607A (zh) * 2014-01-17 2016-08-31 高通股份有限公司 用于小区开关过程的小区模式和csi反馈规则的指示

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CN105917607A (zh) * 2014-01-17 2016-08-31 高通股份有限公司 用于小区开关过程的小区模式和csi反馈规则的指示

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HUAWEI ET AL.: "Further enhancements on codebook design", 3GPP TSG RAN WG1 MEETING #91 R1-1719819, 1 December 2017 (2017-12-01), XP051369197 *
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020194279A1 (fr) * 2019-03-28 2020-10-01 Lenovo (Singapore) Pte. Ltd. Procédé et appareil pour générer un rapport d'informations d'état de canal
US11387887B2 (en) 2019-03-28 2022-07-12 Lenovo (Singapore) Pte. Ltd. Method and apparatus for generating a channel state information report
WO2024060255A1 (fr) * 2022-09-23 2024-03-28 Nec Corporation Procédés, dispositifs et support de communication

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