US20230037394A1 - Method and apparatus for compression-based csi reporting - Google Patents

Method and apparatus for compression-based csi reporting Download PDF

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Publication number
US20230037394A1
US20230037394A1 US17/812,136 US202217812136A US2023037394A1 US 20230037394 A1 US20230037394 A1 US 20230037394A1 US 202217812136 A US202217812136 A US 202217812136A US 2023037394 A1 US2023037394 A1 US 2023037394A1
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Prior art keywords
basis
vectors
csi
vector
basis vectors
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US17/812,136
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English (en)
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Md. Saifur Rahman
Eko Onggosanusi
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority to US17/812,136 priority Critical patent/US20230037394A1/en
Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ONGGOSANUSI, EKO, RAHMAN, Md. Saifur
Priority to PCT/KR2022/010721 priority patent/WO2023003401A1/fr
Priority to KR1020247002661A priority patent/KR20240036013A/ko
Priority to EP22846271.9A priority patent/EP4360229A1/fr
Priority to CN202280051848.XA priority patent/CN117813774A/zh
Publication of US20230037394A1 publication Critical patent/US20230037394A1/en
Priority to US18/464,005 priority patent/US20230421228A1/en
Abandoned legal-status Critical Current

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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
    • H04B7/0613—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
    • H04B7/0634—Antenna weights or vector/matrix coefficients
    • 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
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • 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
    • 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
    • H04B7/0658—Feedback reduction
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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

  • the present disclosure relates generally to wireless communication systems and more specifically to compression-based CSI reporting.
  • the gNB may transmit a reference signal, e.g., CSI-RS, to the UE for DL channel measurement, and the UE may report (e.g., feedback) information about channel measurement, e.g., CSI, to the gNB.
  • CSI-RS reference signal
  • the gNB is able to select appropriate communication parameters to efficiently and effectively perform wireless data communication with the UE.
  • Embodiments of the present disclosure provide methods and apparatuses for signaling on CSI format.
  • a UE in a wireless communication system includes a transceiver configured to: receive a configuration about a channel state information (CSI) report, the configuration including information about a codebook, the codebook comprising components: (i) sets of basis vectors including a first set of vectors each of length P CSIRS ⁇ 1 for a spatial domain (SD), a second set of vectors each of length N 3 ⁇ 1 for a frequency domain (FD), and a third set of vectors each of length N 4 ⁇ 1 for a Doppler domain (DD), and (ii) coefficients associated with each basis vector triple (a i ,b f ,c d ), a t from the first set, b f from the second set, and c d from the third set.
  • CSI channel state information
  • the UE further includes a processor operably coupled to the transceiver.
  • the processor is configured to: determine, based on the configuration, the components.
  • the transceiver is further configured to transmit the CSI report including: at least one basis vector indicator indicating all or a portion of the sets of basis vectors, and at least one coefficient indicator indicating all or a portion of the coefficients, wherein N 3 and N 4 are total number of FD and DD units respectively, and wherein P CSIRS is a number of CSI-RS ports configured for the CSI report.
  • a BS in a wireless communication system includes a processor configured to: generate a configuration about a CSI report, the configuration including information about a codebook, the codebook comprising components: (i) sets of basis vectors including a first set of vectors each of length P CSIRS ⁇ 1 for a SD, a second set of vectors each of length N 3 ⁇ 1 for a FD, and a third set of vectors each of length N 4 ⁇ 1 for a DD, and (ii) coefficients associated with each basis vector triple (a i ,b f ,c d ), a t from the first set, b f from the second set, and c d from the third set.
  • the BS further includes a transceiver operably coupled to the processor.
  • the transceiver is configured to: transmit the configuration; and receive the CSI report based on the configuration, wherein the CSI report includes: at least one basis vector indicator indicating all or a portion of the sets of basis vectors, and at least one coefficient indicator indicating all or a portion of the coefficients, wherein N 3 and N 4 are total number of FD and DD units respectively, and wherein P CSIRS is a number of CSI-RS ports configured for the CSI report.
  • a method for operating a UE comprises: receiving a configuration about a CSI report, the configuration including information about a codebook, the codebook comprising components: (i) sets of basis vectors including a first set of vectors each of length P CSIRS ⁇ 1 for a SD, a second set of vectors each of length N 3 ⁇ 1 for a FD, and a third set of vectors each of length N 4 ⁇ 1 for a DD, and (ii) coefficients associated with each basis vector triple (a i ,b f ,c d ), a t from the first set, b f from the second set, and c d from the third set; determining, based on the configuration, the components; and transmitting the CSI report including: at least one basis vector indicator indicating all or a portion of the sets of basis vectors, and at least one coefficient indicator indicating all or a portion of the coefficients, wherein N 3 and N 4 are total number of FD and
  • Couple and its derivatives refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact with one another.
  • transmit and “communicate,” as well as derivatives thereof, encompass both direct and indirect communication.
  • the term “or” is inclusive, meaning and/or.
  • controller means any device, system or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and/or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.
  • phrases “at least one of,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed.
  • “at least one of: A, B, and C” includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.
  • various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium.
  • application and “program” refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code.
  • computer readable program code includes any type of computer code, including source code, object code, and executable code.
  • computer readable medium includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory.
  • ROM read only memory
  • RAM random access memory
  • CD compact disc
  • DVD digital video disc
  • a “non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals.
  • a non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.
  • FIG. 1 illustrates an example wireless network according to embodiments of the present disclosure
  • FIG. 2 illustrates an example gNB according to embodiments of the present disclosure
  • FIG. 3 illustrates an example UE according to embodiments of the present disclosure
  • FIG. 4 A illustrates a high-level diagram of an orthogonal frequency division multiple access transmit path according to embodiments of the present disclosure
  • FIG. 4 B illustrates a high-level diagram of an orthogonal frequency division multiple access receive path according to embodiments of the present disclosure
  • FIG. 5 illustrates a transmitter block diagram for a PDSCH in a subframe according to embodiments of the present disclosure
  • FIG. 6 illustrates a receiver block diagram for a PDSCH in a subframe according to embodiments of the present disclosure
  • FIG. 7 illustrates a transmitter block diagram for a PUSCH in a subframe according to embodiments of the present disclosure
  • FIG. 8 illustrates a receiver block diagram for a PUSCH in a subframe according to embodiments of the present disclosure
  • FIG. 9 illustrates an example antenna blocks or arrays forming beams according to embodiments of the present disclosure
  • FIG. 10 illustrates channel measurements with and without Doppler components according to embodiments of the present disclosure
  • FIG. 11 illustrates an antenna port layout according to embodiments of the present disclosure
  • FIG. 12 illustrates a 3D grid of oversampled DFT beams according to embodiments of the present disclosure
  • FIG. 13 illustrates an example of a UE configured to receive a burst of NZP CSI-RS resources according to embodiments of the present disclosure
  • FIG. 14 illustrates an example of a UE configured to determine a value of N 4 based on the value B in a CSI-RS burst and a sub-time unit size N ST according to embodiments of the present disclosure
  • FIG. 15 illustrates an example of a UE configured to determine a value of frequency-domain unit and a value of time/Doppler domain unit based on j ⁇ 1 CSI-RS bursts that occupy a frequency band and a time span according to embodiments of the present disclosure
  • FIG. 16 illustrates a flow chart of a method for operating a UE according to embodiments of the present disclosure.
  • FIG. 17 illustrates a flow chart of a method for operating a BS according to embodiments of the present disclosure.
  • FIG. 1 through FIG. 17 discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device.
  • both FDD and TDD are considered as the duplex method for both DL and UL signaling.
  • orthogonal frequency division multiplexing OFDM
  • orthogonal frequency division multiple access OFDMA
  • F-OFDM filtered OFDM
  • the 5G or pre-5G communication system is also called a “beyond 4G network” or a “post LTE system.”
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher data rates or in lower frequency bands, such as below 6 GHz, to enable robust coverage and mobility support.
  • mmWave e.g., 60 GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO full dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques and the like are discussed in 5G communication systems.
  • RANs cloud radio access networks
  • D2D device-to-device
  • wireless backhaul communication moving network
  • cooperative communication coordinated multi-points (CoMP) transmission and reception, interference mitigation and cancelation and the like.
  • CoMP coordinated multi-points
  • 5G systems and frequency bands associated therewith are for reference as certain embodiments of the present disclosure may be implemented in 5G systems.
  • the present disclosure is not limited to 5G systems, or the frequency bands associated therewith, and embodiments of the present disclosure may be utilized in connection with any frequency band.
  • aspects of the present disclosure may also be applied to deployment of 5G communication systems, 6G or even later releases which may use terahertz (THz) bands.
  • THz terahertz
  • FIGS. 1 - 4 B below describe various embodiments implemented in wireless communications systems and with the use of orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication techniques.
  • OFDM orthogonal frequency division multiplexing
  • OFDMA orthogonal frequency division multiple access
  • FIG. 1 illustrates an example wireless network according to embodiments of the present disclosure.
  • the embodiment of the wireless network shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 could be used without departing from the scope of this disclosure.
  • the wireless network includes a gNB 101 , a gNB 102 , and a gNB 103 .
  • the gNB 101 communicates with the gNB 102 and the gNB 103 .
  • the gNB 101 also communicates with at least one network 130 , such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.
  • IP Internet Protocol
  • the gNB 102 provides wireless broadband access to the network 130 for a first plurality of user equipments (UEs) within a coverage area 120 of the gNB 102 .
  • the first plurality of UEs includes a UE 111 , which may be located in a small business; a UE 112 , which may be located in an enterprise (E); a UE 113 , which may be located in a WiFi hotspot (HS); a UE 114 , which may be located in a first residence (R); a UE 115 , which may be located in a second residence (R); and a UE 116 , which may be a mobile device (M), such as a cell phone, a wireless laptop, a wireless PDA, or the like.
  • M mobile device
  • the gNB 103 provides wireless broadband access to the network 130 for a second plurality of UEs within a coverage area 125 of the gNB 103 .
  • the second plurality of UEs includes the UE 115 and the UE 116 .
  • one or more of the gNBs 101 - 103 may communicate with each other and with the UEs 111 - 116 using 5G, LTE, LTE-A, WiMAX, WiFi, or other wireless communication techniques.
  • the term “base station” or “BS” can refer to any component (or collection of components) configured to provide wireless access to a network, such as transmit point (TP), transmit-receive point (TRP), an enhanced base station (eNodeB or eNB), a 5G base station (gNB), a macrocell, a femtocell, a WiFi access point (AP), or other wirelessly enabled devices.
  • Base stations may provide wireless access in accordance with one or more wireless communication protocols, e.g., 5G 3GPP new radio interface/access (NR), long term evolution (LTE), LTE advanced (LTE-A), high speed packet access (HSPA), Wi-Fi 802.11a/b/g/n/ac, etc.
  • 5G 3GPP new radio interface/access NR
  • LTE long term evolution
  • LTE-A LTE advanced
  • HSPA high speed packet access
  • Wi-Fi 802.11a/b/g/n/ac etc.
  • the terms “BS” and “TRP” are used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals.
  • the term “user equipment” or “UE” can refer to any component such as “mobile station,” “subscriber station,” “remote terminal,” “wireless terminal,” “receive point,” or “user device.”
  • the terms “user equipment” and “UE” are used in this patent document to refer to remote wireless equipment that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile telephone or smartphone) or is normally considered a stationary device (such as a desktop computer or vending machine).
  • Dotted lines show the approximate extents of the coverage areas 120 and 125 , which are shown as approximately circular for the purposes of illustration and explanation only. It should be clearly understood that the coverage areas associated with gNBs, such as the coverage areas 120 and 125 , may have other shapes, including irregular shapes, depending upon the configuration of the gNBs and variations in the radio environment associated with natural and man-made obstructions.
  • one or more of the UEs 111 - 116 include circuitry, programing, or a combination thereof, for receiving a configuration about a CSI report, the configuration including information about a codebook, the codebook comprising components: (i) sets of basis vectors including a first set of vectors each of length P CSIRS ⁇ 1 for a SD, a second set of vectors each of length N 3 ⁇ 1 for a FD, and a third set of vectors each of length N 4 ⁇ 1 for a DD, and (ii) coefficients associated with each basis vector triple (a i ,b f ,c d ), a t from the first set, b f from the second set, and c d from the third set; determining, based on the configuration, the components; and transmitting the CSI report including: at least one basis vector indicator indicating all or a portion of the sets of basis vectors, and at least one coefficient indicator indicating all or a portion of the coefficients, where
  • One or more of the gNBs 101 - 103 includes circuitry, programing, or a combination thereof, for generating a configuration about a CSI report, the configuration including information about a codebook, the codebook comprising components: (i) sets of basis vectors including a first set of vectors each of length P CSIRS ⁇ 1 for a SD, a second set of vectors each of length N 3 ⁇ 1 for a FD, and a third set of vectors each of length N 4 ⁇ 1 for a DD, and (ii) coefficients associated with each basis vector triple (a i ,b f ,c d ), a t from the first set, b f from the second set, and c d from the third set; transmitting the configuration; and receiving the CSI report based on the configuration, wherein the CSI report includes: at least one basis vector indicator indicating all or a portion of the sets of basis vectors, and at least one coefficient indicator indicating all or a portion of the coefficients, wherein
  • FIG. 1 illustrates one example of a wireless network
  • the wireless network could include any number of gNBs and any number of UEs in any suitable arrangement.
  • the gNB 101 could communicate directly with any number of UEs and provide those UEs with wireless broadband access to the network 130 .
  • each gNB 102 - 103 could communicate directly with the network 130 and provide UEs with direct wireless broadband access to the network 130 .
  • the gNBs 101 , 102 , and/or 103 could provide access to other or additional external networks, such as external telephone networks or other types of data networks.
  • FIG. 2 illustrates an example gNB 102 according to embodiments of the present disclosure.
  • the embodiment of the gNB 102 illustrated in FIG. 2 is for illustration only, and the gNBs 101 and 103 of FIG. 1 could have the same or similar configuration.
  • gNBs come in a wide variety of configurations, and FIG. 2 does not limit the scope of this disclosure to any particular implementation of a gNB.
  • the gNB 102 includes multiple antennas 205 a - 205 n , multiple RF transceivers 210 a - 210 n , transmit (TX) processing circuitry 215 , and receive (RX) processing circuitry 220 .
  • the gNB 102 also includes a controller/processor 225 , a memory 230 , and a backhaul or network interface 235 .
  • the RF transceivers 210 a - 210 n receive, from the antennas 205 a - 205 n , incoming RF signals, such as signals transmitted by UEs in the network 100 .
  • the RF transceivers 210 a - 210 n down-convert the incoming RF signals to generate IF or baseband signals.
  • the IF or baseband signals are sent to the RX processing circuitry 220 , which generates processed baseband signals by filtering, decoding, and/or digitizing the baseband or IF signals.
  • the RX processing circuitry 220 transmits the processed baseband signals to the controller/processor 225 for further processing.
  • the TX processing circuitry 215 receives analog or digital data (such as voice data, web data, e-mail, or interactive video game data) from the controller/processor 225 .
  • the TX processing circuitry 215 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate processed baseband or IF signals.
  • the RF transceivers 210 a - 210 n receive the outgoing processed baseband or IF signals from the TX processing circuitry 215 and up-converts the baseband or IF signals to RF signals that are transmitted via the antennas 205 a - 205 n.
  • the controller/processor 225 can include one or more processors or other processing devices that control the overall operation of the gNB 102 .
  • the controller/processor 225 could control the reception of UL channel signals and the transmission of DL channel signals by the RF transceivers 210 a - 210 n , the RX processing circuitry 220 , and the TX processing circuitry 215 in accordance with well-known principles.
  • the controller/processor 225 could support additional functions as well, such as more advanced wireless communication functions.
  • the controller/processor 225 could support beam forming or directional routing operations in which outgoing signals from multiple antennas 205 a - 205 n are weighted differently to effectively steer the outgoing signals in a desired direction. Any of a wide variety of other functions could be supported in the gNB 102 by the controller/processor 225 .
  • the controller/processor 225 is also capable of executing programs and other processes resident in the memory 230 , such as an OS.
  • the controller/processor 225 can move data into or out of the memory 230 as required by an executing process.
  • the controller/processor 225 is also coupled to the backhaul or network interface 235 .
  • the backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems over a backhaul connection or over a network.
  • the interface 235 could support communications over any suitable wired or wireless connection(s). For example, when the gNB 102 is implemented as part of a cellular communication system (such as one supporting 5G, LTE, or LTE-A), the interface 235 could allow the gNB 102 to communicate with other gNBs over a wired or wireless backhaul connection.
  • the interface 235 could allow the gNB 102 to communicate over a wired or wireless local area network or over a wired or wireless connection to a larger network (such as the Internet).
  • the interface 235 includes any suitable structure supporting communications over a wired or wireless connection, such as an Ethernet or RF transceiver.
  • the memory 230 is coupled to the controller/processor 225 .
  • Part of the memory 230 could include a RAM, and another part of the memory 230 could include a Flash memory or other ROM.
  • FIG. 2 illustrates one example of gNB 102
  • the gNB 102 could include any number of each component shown in FIG. 2 .
  • an access point could include a number of interfaces 235
  • the controller/processor 225 could support routing functions to route data between different network addresses.
  • the gNB 102 while shown as including a single instance of TX processing circuitry 215 and a single instance of RX processing circuitry 220 , the gNB 102 could include multiple instances of each (such as one per RF transceiver).
  • various components in FIG. 2 could be combined, further subdivided, or omitted and additional components could be added according to particular needs.
  • FIG. 3 illustrates an example UE 116 according to embodiments of the present disclosure.
  • the embodiment of the UE 116 illustrated in FIG. 3 is for illustration only, and the UEs 111 - 115 of FIG. 1 could have the same or similar configuration.
  • UEs come in a wide variety of configurations, and FIG. 3 does not limit the scope of this disclosure to any particular implementation of a UE.
  • the UE 116 includes an antenna 305 , a radio frequency (RF) transceiver 310 , TX processing circuitry 315 , a microphone 320 , and receive (RX) processing circuitry 325 .
  • the UE 116 also includes a speaker 330 , a processor 340 , an input/output (I/O) interface (IF) 345 , a touchscreen 350 , a display 355 , and a memory 360 .
  • the memory 360 includes an operating system (OS) 361 and one or more applications 362 .
  • OS operating system
  • applications 362 one or more applications
  • the RF transceiver 310 receives, from the antenna 305 , an incoming RF signal transmitted by a gNB of the network 100 .
  • the RF transceiver 310 down-converts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal.
  • the IF or baseband signal is sent to the RX processing circuitry 325 , which generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband or IF signal.
  • the RX processing circuitry 325 transmits the processed baseband signal to the speaker 330 (such as for voice data) or to the processor 340 for further processing (such as for web browsing data).
  • the TX processing circuitry 315 receives analog or digital voice data from the microphone 320 or other outgoing baseband data (such as web data, e-mail, or interactive video game data) from the processor 340 .
  • the TX processing circuitry 315 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal.
  • the RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuitry 315 and up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 305 .
  • the processor 340 can include one or more processors or other processing devices and execute the OS 361 stored in the memory 360 in order to control the overall operation of the UE 116 .
  • the processor 340 could control the reception of DL channel signals and the transmission of UL channel signals by the RF transceiver 310 , the RX processing circuitry 325 , and the TX processing circuitry 315 in accordance with well-known principles.
  • the processor 340 includes at least one microprocessor or microcontroller.
  • the processor 340 is also capable of executing other processes and programs resident in the memory 360 , such as processes for receiving a configuration about a CSI report, the configuration including information about a codebook, the codebook comprising components: (i) sets of basis vectors including a first set of vectors each of length P CSIRS ⁇ 1 for a SD, a second set of vectors each of length N 3 ⁇ 1 for a FD, and a third set of vectors each of length N 4 ⁇ 1 for a DD, and (ii) coefficients associated with each basis vector triple (a i ,b f ,c d ), a t from the first set, b f from the second set, and c d from the third set; determining, based on the configuration, the components; and transmitting the CSI report including: at least one basis vector indicator indicating all or a portion of the sets of basis vectors, and at least one coefficient indicator indicating all or a portion of the coefficients, wherein N 3 and N 4 are total number
  • the processor 340 can move data into or out of the memory 360 as required by an executing process.
  • the processor 340 is configured to execute the applications 362 based on the OS 361 or in response to signals received from gNBs or an operator.
  • the processor 340 is also coupled to the I/O interface 345 , which provides the UE 116 with the ability to connect to other devices, such as laptop computers and handheld computers.
  • the I/O interface 345 is the communication path between these accessories and the processor 340 .
  • the processor 340 is also coupled to the touchscreen 350 and the display 355 .
  • the operator of the UE 116 can use the touchscreen 350 to enter data into the UE 116 .
  • the display 355 may be a liquid crystal display, light emitting diode display, or other display capable of rendering text and/or at least limited graphics, such as from web sites.
  • the memory 360 is coupled to the processor 340 .
  • Part of the memory 360 could include a random-access memory (RAM), and another part of the memory 360 could include a Flash memory or other read-only memory (ROM).
  • RAM random-access memory
  • ROM read-only memory
  • FIG. 3 illustrates one example of UE 116
  • various changes may be made to FIG. 3 .
  • various components in FIG. 3 could be combined, further subdivided, or omitted and additional components could be added according to particular needs.
  • the processor 340 could be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs).
  • FIG. 3 illustrates the UE 116 configured as a mobile telephone or smartphone, UEs could be configured to operate as other types of mobile or stationary devices.
  • FIG. 4 A is a high-level diagram of transmit path circuitry.
  • the transmit path circuitry may be used for an orthogonal frequency division multiple access (OFDMA) communication.
  • FIG. 4 B is a high-level diagram of receive path circuitry.
  • the receive path circuitry may be used for an orthogonal frequency division multiple access (OFDMA) communication.
  • the transmit path circuitry may be implemented in a base station (gNB) 102 or a relay station, and the receive path circuitry may be implemented in a user equipment (e.g., user equipment 116 of FIG. 1 ).
  • gNB base station
  • the receive path circuitry may be implemented in a user equipment (e.g., user equipment 116 of FIG. 1 ).
  • the receive path circuitry 450 may be implemented in a base station (e.g., gNB 102 of FIG. 1 ) or a relay station, and the transmit path circuitry may be implemented in a user equipment (e.g., user equipment 116 of FIG. 1 ).
  • a base station e.g., gNB 102 of FIG. 1
  • the transmit path circuitry may be implemented in a user equipment (e.g., user equipment 116 of FIG. 1 ).
  • Transmit path circuitry comprises channel coding and modulation block 405 , serial-to-parallel (S-to-P) block 410 , Size N Inverse Fast Fourier Transform (IFFT) block 415 , parallel-to-serial (P-to-S) block 420 , add cyclic prefix block 425 , and up-converter (UC) 430 .
  • S-to-P serial-to-parallel
  • IFFT Inverse Fast Fourier Transform
  • P-to-S parallel-to-serial
  • UC up-converter
  • Receive path circuitry 450 comprises down-converter (DC) 455 , remove cyclic prefix block 460 , serial-to-parallel (S-to-P) block 465 , Size N Fast Fourier Transform (FFT) block 470 , parallel-to-serial (P-to-S) block 475 , and channel decoding and demodulation block 480 .
  • DC down-converter
  • S-to-P serial-to-parallel
  • FFT Fast Fourier Transform
  • P-to-S parallel-to-serial
  • channel decoding and demodulation block 480 channel decoding and demodulation block 480 .
  • FIGS. 4 A 400 and 4 B 450 may be implemented in software, while other components may be implemented by configurable hardware or a mixture of software and configurable hardware.
  • the FFT blocks and the IFFT blocks described in this disclosure document may be implemented as configurable software algorithms, where the value of Size N may be modified according to the implementation.
  • the value of the N variable may be any integer number (i.e., 1, 4, 3, 4, etc.), while for FFT and IFFT functions, the value of the N variable may be any integer number that is a power of two (i.e., 1, 2, 4, 8, 16, etc.).
  • channel coding and modulation block 405 receives a set of information bits, applies coding (e.g., LDPC coding) and modulates (e.g., quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) the input bits to produce a sequence of frequency-domain modulation symbols.
  • Serial-to-parallel block 410 converts (i.e., de-multiplexes) the serial modulated symbols to parallel data to produce N parallel symbol streams where N is the IFFT/FFT size used in BS 102 and UE 116 .
  • Size N IFFT block 415 then performs an IFFT operation on the N parallel symbol streams to produce time-domain output signals.
  • the transmitted RF signal arrives at the UE 116 after passing through the wireless channel, and reverse operations to those at gNB 102 are performed.
  • Down-converter 455 down-converts the received signal to baseband frequency and removes cyclic prefix block 460 and removes the cyclic prefix to produce the serial time-domain baseband signal.
  • Serial-to-parallel block 465 converts the time-domain baseband signal to parallel time-domain signals.
  • Size N FFT block 470 then performs an FFT algorithm to produce N parallel frequency-domain signals.
  • Parallel-to-serial block 475 converts the parallel frequency-domain signals to a sequence of modulated data symbols.
  • Channel decoding and demodulation block 480 demodulates and then decodes the modulated symbols to recover the original input data stream.
  • Each of gNBs 101 - 103 may implement a transmit path that is analogous to transmitting in the downlink to user equipment 111 - 116 and may implement a receive path that is analogous to receiving in the uplink from user equipment 111 - 116 .
  • each one of user equipment 111 - 116 may implement a transmit path corresponding to the architecture for transmitting in the uplink to gNBs 101 - 103 and may implement a receive path corresponding to the architecture for receiving in the downlink from gNBs 101 - 103 .
  • enhanced mobile broadband eMBB
  • ultra-reliable and low latency URLL
  • massive machine type communication mMTC is determined that a number of devices can be as many as 100,000 to 1 million per km2, but the reliability/throughput/latency requirement could be less stringent. This scenario may also involve power efficiency requirement as well, in that the battery consumption may be minimized as possible.
  • a communication system includes a downlink (DL) that conveys signals from transmission points such as base stations (BSs) or NodeBs to user equipments (UEs) and an Uplink (UL) that conveys signals from UEs to reception points such as NodeBs.
  • DL downlink
  • UE user equipment
  • UL Uplink
  • a UE also commonly referred to as a terminal or a mobile station, may be fixed or mobile and may be a cellular phone, a personal computer device, or an automated device.
  • An eNodeB which is generally a fixed station, may also be referred to as an access point or other equivalent terminology. For LTE systems, a NodeB is often referred as an eNodeB.
  • DL signals can include data signals conveying information content, control signals conveying DL control information (DCI), and reference signals (RS) that are also known as pilot signals.
  • DCI DL control information
  • RS reference signals
  • An eNodeB transmits data information through a physical DL shared channel (PDSCH).
  • An eNodeB transmits DCI through a physical DL control channel (PDCCH) or an Enhanced PDCCH (EPDCCH).
  • PDSCH physical DL shared channel
  • EPCCH Enhanced PDCCH
  • An eNodeB transmits acknowledgement information in response to data transport block (TB) transmission from a UE in a physical hybrid ARQ indicator channel (PHICH).
  • An eNodeB transmits one or more of multiple types of RS including a UE-common RS (CRS), a channel state information RS (CSI-RS), or a demodulation RS (DMRS).
  • CRS is transmitted over a DL system bandwidth (BW) and can be used by UEs to obtain a channel estimate to demodulate data or control information or to perform measurements.
  • BW DL system bandwidth
  • an eNodeB may transmit a CSI-RS with a smaller density in the time and/or frequency domain than a CRS.
  • DMRS can be transmitted only in the BW of a respective PDSCH or EPDCCH and a UE can use the DMRS to demodulate data or control information in a PDSCH or an EPDCCH, respectively.
  • a transmission time interval for DL channels is referred to as a subframe and can have, for example, duration of 1 millisecond.
  • DL signals also include transmission of a logical channel that carries system control information.
  • a BCCH is mapped to either a transport channel referred to as a broadcast channel (BCH) when the DL signals convey a master information block (MIB) or to a DL shared channel (DL-SCH) when the DL signals convey a System Information Block (SIB).
  • MIB master information block
  • DL-SCH DL shared channel
  • SIB System Information Block
  • Most system information is included in different SIBs that are transmitted using DL-SCH.
  • a presence of system information on a DL-SCH in a subframe can be indicated by a transmission of a corresponding PDCCH conveying a codeword with a cyclic redundancy check (CRC) scrambled with system information RNTI (SI-RNTI).
  • SI-RNTI system information RNTI
  • SIB-1 scheduling information for the first SIB (SIB-1) can be provided by the MIB.
  • a DL resource allocation is performed in a unit of subframe and a group of physical resource blocks (PRBs).
  • a transmission BW includes frequency resource units referred to as resource blocks (RBs).
  • Each RB includes NR B sub-carriers, or resource elements (REs), such as 12 REs.
  • a unit of one RB over one subframe is referred to as a PRB.
  • a UE can be allocated M PDSCH RBs for a total of M sc PDSCH M PDSCH ⁇ N sc RB REs for the PDSCH transmission BW.
  • UCI includes Hybrid Automatic Repeat request acknowledgement (HARQ-ACK) information, indicating correct (ACK) or incorrect (NACK) detection for a data TB in a PDSCH or absence of a PDCCH detection (DTX), scheduling request (SR) indicating whether a UE has data in the UE's buffer, rank indicator (RI), and channel state information (CSI) enabling an eNodeB to perform link adaptation for PDSCH transmissions to a UE.
  • HARQ-ACK information is also transmitted by a UE in response to a detection of a PDCCH/EPDCCH indicating a release of semi-persistently scheduled PDSCH.
  • FIG. 5 illustrates a transmitter block diagram 500 for a PDSCH in a subframe according to embodiments of the present disclosure.
  • the embodiment of the transmitter block diagram 500 illustrated in FIG. 5 is for illustration only.
  • One or more of the components illustrated in FIG. 5 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • FIG. 5 does not limit the scope of this disclosure to any particular implementation of the transmitter block diagram 500 .
  • information bits 510 are encoded by encoder 520 , such as a turbo encoder, and modulated by modulator 530 , for example using quadrature phase shift keying (QPSK) modulation.
  • a serial to parallel (S/P) converter 540 generates M modulation symbols that are subsequently provided to a mapper 550 to be mapped to REs selected by a transmission BW selection unit 555 for an assigned PDSCH transmission BW, unit 560 applies an Inverse fast Fourier transform (IFFT), the output is then serialized by a parallel to serial (P/S) converter 570 to create a time domain signal, filtering is applied by filter 580 , and a signal transmitted 590 .
  • Additional functionalities such as data scrambling, cyclic prefix insertion, time windowing, interleaving, and others are well known in the art and are not shown for brevity.
  • FIG. 6 illustrates a receiver block diagram 600 for a PDSCH in a subframe according to embodiments of the present disclosure.
  • the embodiment of the diagram 600 illustrated in FIG. 6 is for illustration only.
  • One or more of the components illustrated in FIG. 6 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • FIG. 6 does not limit the scope of this disclosure to any particular implementation of the diagram 600 .
  • a received signal 610 is filtered by filter 620 , REs 630 for an assigned reception BW are selected by BW selector 635 , unit 640 applies a fast Fourier transform (FFT), and an output is serialized by a parallel-to-serial converter 650 .
  • a demodulator 660 coherently demodulates data symbols by applying a channel estimate obtained from a DMRS or a CRS (not shown), and a decoder 670 , such as a turbo decoder, decodes the demodulated data to provide an estimate of the information data bits 680 . Additional functionalities such as time-windowing, cyclic prefix removal, de-scrambling, channel estimation, and de-interleaving are not shown for brevity.
  • FIG. 7 illustrates a transmitter block diagram 700 for a PUSCH in a subframe according to embodiments of the present disclosure.
  • the embodiment of the block diagram 700 illustrated in FIG. 7 is for illustration only.
  • One or more of the components illustrated in FIG. 5 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • FIG. 7 does not limit the scope of this disclosure to any particular implementation of the block diagram 700 .
  • information data bits 710 are encoded by encoder 720 , such as a turbo encoder, and modulated by modulator 730 .
  • a discrete Fourier transform (DFT) unit 740 applies a DFT on the modulated data bits, REs 750 corresponding to an assigned PUSCH transmission BW are selected by transmission BW selection unit 755 , unit 760 applies an IFFT and, after a cyclic prefix insertion (not shown), filtering is applied by filter 770 and a signal transmitted 780 .
  • DFT discrete Fourier transform
  • FIG. 8 illustrates a receiver block diagram 800 for a PUSCH in a subframe according to embodiments of the present disclosure.
  • the embodiment of the block diagram 800 illustrated in FIG. 8 is for illustration only.
  • One or more of the components illustrated in FIG. 8 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • FIG. 8 does not limit the scope of this disclosure to any particular implementation of the block diagram 800 .
  • a received signal 810 is filtered by filter 820 .
  • unit 830 applies a FFT
  • REs 840 corresponding to an assigned PUSCH reception BW are selected by a reception BW selector 845
  • unit 850 applies an inverse DFT (IDFT)
  • IDFT inverse DFT
  • a demodulator 860 coherently demodulates data symbols by applying a channel estimate obtained from a DMRS (not shown)
  • a decoder 870 such as a turbo decoder, decodes the demodulated data to provide an estimate of the information data bits 880 .
  • next generation cellular systems various use cases are envisioned beyond the capabilities of LTE system.
  • 5G or the fifth-generation cellular system a system capable of operating at sub-6 GHz and above-6 GHz (for example, in mmWave regime) becomes one of the requirements.
  • 3GPP TR 22.891 74 5G use cases have been identified and described; those use cases can be roughly categorized into three different groups.
  • a first group is termed “enhanced mobile broadband (eMBB),” targeted to high data rate services with less stringent latency and reliability requirements.
  • eMBB enhanced mobile broadband
  • a second group is termed “ultra-reliable and low latency (URLL)” targeted for applications with less stringent data rate requirements, but less tolerant to latency.
  • URLL ultra-reliable and low latency
  • a third group is termed “massive MTC (mMTC)” targeted for large number of low-power device connections such as 1 million per km 2 with less stringent the reliability, data rate, and latency requirements.
  • the 3GPP NR specification supports up to 32 CSI-RS antenna ports which enable a gNB to be equipped with a large number of antenna elements (such as 64 or 128). In this case, a plurality of antenna elements is mapped onto one CSI-RS port. For next generation cellular systems such as 5G, the maximum number of CSI-RS ports can either remain the same or increase.
  • FIG. 9 illustrates an example antenna blocks or arrays 900 according to embodiments of the present disclosure.
  • the embodiment of the antenna blocks or arrays 1100 illustrated in FIG. 9 is for illustration only.
  • FIG. 9 does not limit the scope of this disclosure to any particular implementation of the antenna blocks or arrays 900 .
  • the number of CSI-RS ports which can correspond to the number of digitally precoded ports—tends to be limited due to hardware constraints (such as the feasibility to install a large number of ADCs/DACs at mmWave frequencies) as illustrated in FIG. 9 .
  • one CSI-RS port is mapped onto a large number of antenna elements which can be controlled by a bank of analog phase shifters 901 .
  • One CSI-RS port can then correspond to one sub-array which produces a narrow analog beam through analog beamforming 905 .
  • This analog beam can be configured to sweep across a wider range of angles ( 920 ) by varying the phase shifter bank across symbols or subframes.
  • the number of sub-arrays (equal to the number of RF chains) is the same as the number of CSI-RS ports N CSI-PORT .
  • a digital beamforming unit 910 performs a linear combination across N CSI-PORT analog beams to further increase precoding gain. While analog beams are wideband (hence not frequency-selective), digital precoding can be varied across frequency sub-bands or resource blocks.
  • NP non-precoded
  • CSI-RS For non-precoded (NP) CSI-RS, a cell-specific one-to-one mapping between CSI-RS port and TXRU is utilized. Different CSI-RS ports have the same wide beam width and direction and hence generally cell wide coverage.
  • beamformed CSI-RS beamforming operation, either cell-specific or UE-specific, is applied on a non-zero-power (NZP) CSI-RS resource (e.g., comprising multiple ports). At least at a given time/frequency, CSI-RS ports have narrow beam widths and hence not cell wide coverage, and at least from the gNB perspective. At least some CSI-RS port-resource combinations have different beam directions.
  • NZP non-zero-power
  • UE-specific BF CSI-RS can be readily used. This is typically feasible when UL-DL duplex distance is sufficiently small. When this condition does not hold, however, some UE feedback is necessary for the eNodeB to obtain an estimate of DL long-term channel statistics (or any of representation thereof).
  • T 1 ⁇ T 2
  • MIMO has been identified as an essential feature in order to achieve high system throughput requirements and it will continue to be the same in NR.
  • One of the key components of a MIMO transmission scheme is the accurate CSI acquisition at the eNB (or TRP).
  • TRP the eNB
  • the availability of accurate CSI is necessary in order to guarantee high MU performance.
  • the CSI can be acquired using the SRS transmission relying on the channel reciprocity.
  • the CSI can be acquired using the CSI-RS transmission from the eNB, and CSI acquisition and feedback from the UE.
  • the CSI feedback framework is ‘implicit’ in the form of CQI/PMI/RI derived from a codebook assuming SU transmission from the eNB. Because of the inherent SU assumption while deriving CSI, this implicit CSI feedback is inadequate for MU transmission. Since future (e.g., NR) systems are likely to be more MU-centric, this SU-MU CSI mismatch will be a bottleneck in achieving high MU performance gains. Another issue with implicit feedback is the scalability with larger number of antenna ports at the eNB. For large number of antenna ports, the codebook design for implicit feedback is quite complicated, and the designed codebook is not guaranteed to bring justifiable performance benefits in practical deployment scenarios (for example, only a small percentage gain can be shown at the most).
  • Type II CSI reporting In addition to Type I, a high-resolution CSI reporting, referred to as Type II CSI reporting, is also supported to provide more accurate CSI information to gNB for use cases such as high-order MU-MIMO.
  • the overhead of Type II CSI reporting can be an issue in practical UE implementations.
  • One approach to reduce Type II CSI overhead is based on frequency domain (FD) compression.
  • FD frequency domain
  • Rel. 16 NR DFT-based FD compression of the Type II CSI has been supported (referred to as Rel. 16 enhanced Type II codebook in REF8).
  • Some of the key components for this feature includes (a) spatial domain (SD) basis W 1 , (b) FD basis W f , and (c) coefficients ⁇ tilde over (W) ⁇ 2 that linearly combine SD and FD basis.
  • SD spatial domain
  • FD FD basis
  • W f coefficients ⁇ tilde over (W) ⁇ 2 that linearly combine SD and FD basis.
  • a complete CSI (comprising all components) needs to be reported by the UE.
  • some of the CSI components can be obtained based on the UL channel estimated using SRS transmission from the UE.
  • Rel. 16 NR the DFT-based FD compression is extended to this partial reciprocity case (referred to as Rel.
  • the CSI-RS ports in this case are beamformed in SD (assuming UL-DL channel reciprocity in angular domain), and the beamforming information can be obtained at the gNB based on UL channel estimated using SRS measurements.
  • the Rel. 16 enhanced Type II port selection can be further extended to both angular and delay domains (or SD and FD).
  • the DFT-based SD basis in W 1 and/or DFT-based FD basis in W f can be replaced with SD and FD port selection, i.e., L CSI-RS ports are selected in SD and/or M ports are selected in FD.
  • the CSI-RS ports in this case are beamformed in SD (assuming UL-DL channel reciprocity in angular domain) and/or FD (assuming UL-DL channel reciprocity in delay/frequency domain), and the corresponding SD and/or FD beamforming information can be obtained at the gNB based on UL channel estimated using SRS measurements.
  • SD assuming UL-DL channel reciprocity in angular domain
  • FD assuming UL-DL channel reciprocity in delay/frequency domain
  • FIG. 10 illustrates channel measurement with and without Doppler components 1000 according to embodiments of the present disclosure.
  • the embodiment of the channel measurement with and without Doppler components 1000 illustrated in FIG. 10 is for illustration only.
  • FIG. 10 does not limit the scope of this disclosure to any particular implementation of the channel measurement with and without Doppler components 1000 .
  • the Doppler components of the channel remain almost constant over a large time duration, referred to as channel stationarity time, which is significantly larger than the channel coherence time.
  • channel stationarity time which is significantly larger than the channel coherence time.
  • the current (Rel. 15/16/17) CSI reporting is based on the channel coherence time, which is not suitable when the channel has significant Doppler components.
  • the Doppler components of the channel can be calculated based on measuring a reference signal (RS) burst, where the RS can be CSI-RS or SRS.
  • RS reference signal
  • the UE measures a CSI-RS burst, and use it to obtain Doppler components of the DL channel
  • the gNB measures an SRS burst, and use it to obtain Doppler components of the UL channel.
  • the obtained Doppler components can be reported by the UE using a codebook (as part of a CS report). Or the gNB can use the obtained Doppler components of the UL channel to beamform CSI-RS for CSI reporting by the UE.
  • An illustration of channel measurement with and without Doppler components is shown in FIG. 10 .
  • the measured channel can remain close to the actual varying channel.
  • the measured channel can be far from the actual varying channel.
  • measuring an RS burst is needed in order to obtain the Doppler components of the channel.
  • This disclosure provides several example embodiments on obtaining the Doppler domain components or units that determine the length of the basis vectors that are used for the Doppler compression.
  • the disclosure also describes example embodiments on signaling related to the CSI reporting format.
  • All the following components and embodiments are applicable for UL transmission with CP-OFDM (cyclic prefix OFDM) waveform as well as DFT-SOFDM (DFT-spread OFDM) and SC-FDMA (single-carrier FDMA) waveforms. Furthermore, all the following components and embodiments are applicable for UL transmission when the scheduling unit in time is either one subframe (which can consist of one or multiple slots) or one slot.
  • CP-OFDM cyclic prefix OFDM
  • DFT-SOFDM DFT-spread OFDM
  • SC-FDMA single-carrier FDMA
  • the frequency resolution (reporting granularity) and span (reporting bandwidth) of CSI reporting can be defined in terms of frequency “subbands” and “CSI reporting band” (CRB), respectively.
  • a subband for CSI reporting is defined as a set of contiguous PRBs which represents the smallest frequency unit for CSI reporting.
  • the number of PRBs in a subband can be fixed for a given value of DL system bandwidth, configured either semi-statically via higher-layer/RRC signaling, or dynamically via L1 DL control signaling or MAC control element (MAC CE).
  • the number of PRBs in a subband can be included in CSI reporting setting.
  • CSI reporting band is defined as a set/collection of subbands, either contiguous or non-contiguous, wherein CSI reporting is performed.
  • CSI reporting band can include all the subbands within the DL system bandwidth. This can also be termed “full-band”.
  • CSI reporting band can include only a collection of subbands within the DL system bandwidth. This can also be termed “partial band”.
  • CSI reporting band is used only as an example for representing a function. Other terms such as “CSI reporting subband set” or “CSI reporting bandwidth” can also be used.
  • a UE can be configured with at least one CSI reporting band.
  • This configuration can be semi-static (via higher-layer signaling or RRC) or dynamic (via MAC CE or L1 DL control signaling).
  • RRC higher-layer signaling
  • a UE can report CSI associated with n ⁇ N CSI reporting bands. For instance, >6 GHz, large system bandwidth may require multiple CSI reporting bands.
  • the value of n can either be configured semi-statically (via higher-layer signaling or RRC) or dynamically (via MAC CE or L1 DL control signaling). Alternatively, the UE can report a recommended value of n via an UL channel.
  • CSI parameter frequency granularity can be defined per CSI reporting band as follows.
  • a CSI parameter is configured with “single” reporting for the CSI reporting band with M n subbands when one CSI parameter for all the M n subbands within the CSI reporting band.
  • a CSI parameter is configured with “subband” for the CSI reporting band with M n subbands when one CSI parameter is reported for each of the M n subbands within the CSI reporting band.
  • FIG. 11 illustrates an example antenna port layout 1100 according to embodiments of the present disclosure.
  • the embodiment of the antenna port layout 1100 illustrated in FIG. 11 is for illustration only.
  • FIG. 11 does not limit the scope of this disclosure to any particular implementation of the antenna port layout 1100 .
  • N 1 and N 2 are the number of antenna ports with the same polarization in the first and second dimensions, respectively.
  • N 1 >1, N 2 >1, and for 1D antenna port layouts N 1 >1 and N 2 1 . Therefore, for a dual-polarized antenna port layout, the total number of antenna ports is 2N 1 N 2 .
  • a UE is configured with high-resolution (e.g., Type II) CSI reporting in which the linear combination-based Type II CSI reporting framework is extended to include a frequency dimension in addition to the first and second antenna port dimensions.
  • high-resolution e.g., Type II
  • FIG. 12 illustrates a 3D grid 1300 of the oversampled DFT beams (1st port dim., 2nd port dim., freq. dim.) in which
  • M i is the number of coefficients c l,i,f reported by the UE for a given i, where M i ⁇ M (where ⁇ M i ⁇ or ⁇ M i is either fixed, configured by the gNB or reported by the UE).
  • W ( R ) 1 R [ W 1 W 2 ... W R ] .
  • Eq. 2 is assumed in the rest of the disclosure.
  • the embodiments of the disclosure are general and are also application to Eq. 1, Eq. 3, and Eq. 4.
  • A is an identity matrix, and hence not reported.
  • B is an identity matrix, and hence not reported.
  • w f [ 1 e j ⁇ 2 ⁇ ⁇ ⁇ n 3 , l ( f ) O 3 ⁇ N 3 e j ⁇ 2 ⁇ ⁇ ⁇ 2 ⁇ n 3 , l ( f ) O 3 ⁇ N 3 ... e j ⁇ 2 ⁇ ⁇ ⁇ ( N 3 - 1 ) ⁇ n 3 , l ( f ) O 3 ⁇ N 3 ] T .
  • n 3,l (f) ⁇ 0, 1, . . . , N 3 ⁇ 1 ⁇ .
  • discrete cosine transform DCT basis is used to construct/report basis B for the 3 rd dimension.
  • the m-th column of the DCT compression matrix is simply given by
  • DCT is applied to real valued coefficients
  • the DCT is applied to the real and imaginary components (of the channel or channel eigenvectors) separately.
  • the DCT is applied to the magnitude and phase components (of the channel or channel eigenvectors) separately.
  • DFT or DCT basis is for illustration purpose only. The disclosure is applicable to any other basis vectors to construct/report A and B.
  • a precoder W 1 can be described as follows.
  • the amplitude coefficient (p l,i,f ) is reported using a A-bit amplitude codebook where A belongs to ⁇ 2, 3, 4 ⁇ . If multiple values for A are supported, then one value is configured via higher layer signaling.
  • LC linear combination
  • SD spatial domain
  • FD frequency domain
  • c l,i,f frequency domain
  • K NZ ⁇ K 0 ⁇ 2LM ⁇ 2LM and ⁇ is higher layer configured.
  • the remaining 2LM ⁇ K NZ coefficients that are not reported by the UE are assumed to be zero.
  • the following quantization scheme is used to quantize/report the K NZ NZ coefficients.
  • the UE reports the following for the quantization of the NZ coefficients in ⁇ tilde over (W) ⁇ 2
  • a UE can be configured to report M FD basis vectors.
  • M FD basis vectors In one example,
  • R is higher-layer configured from ⁇ 1, 2 ⁇ and p is higher-layer configured from
  • the p value is higher-layer configured for rank 1-2 CSI reporting.
  • rank >2 e.g., rank 3-4
  • the p value (denoted by v 0 ) can be different.
  • (p, v 0 ) is jointly configured from
  • N 3 N SB ⁇ R
  • N SB is the number of SBs for CQI reporting.
  • M is replaced with M v to show its dependence on the rank value v, hence p is replaced with p v , v ⁇ 1, 2 ⁇ and v 0 is replaced with p v , v ⁇ 3, 4 ⁇ .
  • a UE can be configured to report M v FD basis vectors in one-step from N 3 basis vectors freely (independently) for each layer l ⁇ 0, 1, . . . , v ⁇ 1 ⁇ of a rank v CSI reporting.
  • a UE can be configured to report M v FD basis vectors in two-step as follows.
  • one-step method is used when N 3 ⁇ 19 and two-step method is used when N 3 >19.
  • N 3 ′ ⁇ M ⁇ where ⁇ >1 is either fixed (to 2 for example) or configurable.
  • the codebook parameters used in the DFT based frequency domain compression are (L, p v for v ⁇ 1, 2 ⁇ , p v for v ⁇ 3, 4 ⁇ , ⁇ , ⁇ , N ph ).
  • the set of values for these codebook parameters are as follows.
  • the UE is not expected to be configured with paramCombination-r17 equal to
  • the bitmap parameter typeII-RI-Restriction-r17 forms the bit sequence r 3 , r 2 , r 1 , r 0 where r 0 is the LSB and r 3 is the MSB.
  • the parameter R is configured with the higher-layer parameter numberOfPMISubbandsPerCQISubband-r17.
  • This parameter controls the total number of precoding matrices N 3 indicated by the PMI as a function of the number of subbands in csi-ReportingBand, the subband size configured by the higher-level parameter subbandSize and of the total number of PRBs in the bandwidth part.
  • the above-mentioned framework represents the precoding-matrices for multiple (N 3 ) FD units using a linear combination (double sum) over 2L SD beams and M v FD beams.
  • This framework can also be used to represent the precoding-matrices in time domain (TD) by replacing the FD basis matrix W f with a TD basis matrix W t , wherein the columns of W t comprises M v TD beams that represent some form of delays or channel tap locations.
  • TD time domain
  • the M v TD beams are selected from a set of N 3 TD beams, i.e., N 3 corresponds to the maximum number of TD units, where each TD unit corresponds to a delay or channel tap location.
  • N 3 corresponds to the maximum number of TD units, where each TD unit corresponds to a delay or channel tap location.
  • a TD beam corresponds to a single delay or channel tap location.
  • a TD beam corresponds to multiple delays or channel tap locations.
  • a TD beam corresponds to a combination of multiple delays or channel tap locations.
  • the abovementioned framework for CSI reporting based on space-frequency compression (equation 5) or space-time compression (equation 5A) frameworks can be extended to Doppler domain (e.g., for moderate to high mobility UEs).
  • This disclosure focuses on a CS-RS burst that can be used to obtain Doppler component(s) of the channel, which can be used to perform Doppler domain (DD) or time domain (TD) compression.
  • DD Doppler domain
  • TD time domain
  • the disclosure provides embodiments regarding the granularity or unit of the components across which the TD/DD compression is performed, where each component corresponds to one or multiple time instances within a CSI-RS burst or across multiple CSI-RS bursts.
  • This disclosure focuses on a reference signal burst that can be used to obtain Doppler component(s) of the channel, which can be used to perform Doppler domain compression.
  • FIG. 13 illustrates an example of a UE configured to receive a burst of non-zero power (NZP) CSI-RS resource(s) 1300 according to embodiments of the present disclosure.
  • the embodiment of the UE configured to receive the burst of NZP CSI-RS resource(s) 1300 illustrated in FIG. 13 is for illustration only.
  • FIG. 13 does not limit the scope of this disclosure to any particular implementation of the UE configured to receive a burst of NZP CSI-RS resource(s) 1300 .
  • a UE is configured to receive a burst (or occasions) of non-zero power (NZP) CSI-RS resource(s), referred to as CSI-RS burst (or occasions) for brevity, in B time slots, where B ⁇ 1.
  • the B time slots can be accordingly to at least one of the following examples.
  • the UE receives the CSI-RS burst, estimates the B instances of the DL channel measurements, and uses the channel estimates to obtain the Doppler component(s) of the DL channel.
  • the CSI-RS burst can be linked to (or associated with) a single CSI reporting setting (e.g., via higher layer parameter CSI-ReportConfig), wherein the corresponding CSI report includes an information about the Doppler component(s) of the DL channel.
  • h t be the DL channel estimate based on the CSI-RS resource(s) received in time slot t ⁇ 0, 1, . . . , B ⁇ 1 ⁇ .
  • the DL channel estimate in slot t is a matrix G t of size N Rx ⁇ N Tx ⁇ N Sc
  • h t vec(G t )
  • N Rx , N Tx , and N Sc are number of receive (Rx) antennae at the UE, number of CSI-RS ports measured by the UE, and number of subcarriers in frequency band of the CSI-RS burst, respectively.
  • the notation vec(X) is used to denote the vectorization operation wherein the matrix X is transformed into a vector by concatenating the elements of the matrix in an order, for example, 1 ⁇ 2 ⁇ 3 4 and so on, implying that the concatenation starts from the first dimension, then moves second dimension, and continues until the last dimension.
  • H B [h 0 h 1 . . . h B-1 ] be a concatenated DL channel.
  • the Doppler component(s) of the DL channel can be obtained based on H B .
  • the Doppler component(s) of the channel is represented by the DD or TD basis matrix ⁇ and the coefficient matrix C.
  • FIG. 14 illustrates an example of a UE configured to determine a value of N 4 based on the value B in a CSI-RS burst and a sub-time unit size N ST 1400 according to embodiments of the present disclosure.
  • the embodiment of the UE configured to determine a value of N 4 based on the value B in a CSI-RS burst and a sub-time unit size N ST 1400 illustrated in FIG. 14 is for illustration only.
  • FIG. 14 does not limit the scope of this disclosure to any particular implementation of the UE configured to determine a value of N 4 based on the value B in a CSI-RS burst and a sub-time unit size N ST 1400 .
  • N 4 be the length of the basis vectors ⁇ S ⁇ , e.g., each basis vector is a length N 4 ⁇ 1 column vector.
  • a UE is configured to determine a value of N 4 based on the value B (number of CSI-RS instances) in a CSI-RS burst and components across which the DD or TD compression is performed, where each component corresponds to one or multiple time instances within the CSI-RS burst.
  • the B CSI-RS instances can be partitioned into sub-time (ST) units (instances), where each ST unit is defined as (up to) N ST contiguous time instances in the CSI-RS burst.
  • the value of N ST (fixed or indicated or reported) can be subject to a UE capability reporting.
  • the value of N ST can also be dependent on the value of B (e.g., one value for a range of values for B and another value for another range of values for B).
  • FIG. 15 illustrates an example of a UE configured to determine a value of a frequency-domain unit and a value of time/Doppler domain unit based on J ⁇ 1 CSI-RS bursts that occupy a frequency band and a time span 1500 according to embodiments of the present disclosure.
  • the embodiment of the UE configured to determine a value of a frequency-domain unit and a value of time/Doppler domain unit based on J ⁇ 1 CSI-RS bursts that occupy a frequency band and a time span 1500 illustrated in FIG. 15 is for illustration only.
  • FIG. 15 illustrates an example of a UE configured to determine a value of a frequency-domain unit and a value of time/Doppler domain unit based on J ⁇ 1 CSI-RS bursts that occupy a frequency band and a time span 1500 according to embodiments of the present disclosure.
  • 15 does not limit the scope of this disclosure to any particular implementation of the UE configured to determine a value of a frequency-domain unit and a value of time/Doppler domain unit based on J ⁇ 1 CSI-RS bursts that occupy a frequency band and a time span 1500 .
  • a UE is configured with J ⁇ 1 CSI-RS bursts (as illustrated earlier in the disclosure) that occupy a frequency band and a time span (duration), wherein the frequency band comprises A RBs, and the time span comprises B time instances (of CSI-RS resource(s)) or C or B+C time instances, as described above.
  • the A RBs and/or Y time instances can be aggregated across J CSI-RS bursts.
  • the frequency band equals the CSI reporting band
  • the time span equals the number of CSI-RS resource instances (across J CSI-RS bursts) or the time span/window during which the CSI report is expected to be valid, both can be configured to the UE for a CSI reporting, which can be based on the DD or TD compression.
  • the UE is further configured to partition (divide) the A RBs into subbands (SBs) and/or the Y time instances into sub-times (STs).
  • the partition of A RBs can be based on a SB size value N SB , which can be configured to the UE (cf. Table 5.2.1.4-2 of REF8).
  • the partition of Y time instances can be based either on an ST size value N ST or on an r value, as described in this disclosure.
  • the CSI reporting is based on channel measurements (based on CSI-RS bursts) in three-dimensions (3D): the first dimension corresponds to SD comprising 2N 1 N 2 or P CSIRS CSI-RS antenna ports, the second dimension corresponds to FD comprising N 3 FD units (e.g., SB), and the third dimension corresponds to DD or TD comprising N 4 DD or TD units (e.g., ST).
  • the 3D channel measurements can be compressed using basis vectors (or matrices) similar to the Rel. 16 enhanced Type II codebook. Let W 1 , W f , and W d respectively denote basis matrices whose columns comprise basis vectors for SD, FD, and DD or TD.
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) three separate basis matrices W 1 , W f , and W d for SD, FD, and DD or TD compression, respectively, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) three separate basis matrices W 1 , W f , and W d for SD, FD, and DD or TD compression, respectively, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • W 1 is a P CSIRS ⁇ N 3 N 4 matrix whose columns are precoding vectors for N 3 N 4 pairs of (FD, DD/TD) units
  • W 1 is a P CSIRS ⁇ 2L or P CSIRS ⁇ L SD basis matrix (similar to Rel. 16 enhanced Type II codebook)
  • ⁇ tilde over (W) ⁇ 2 is a 2L ⁇ M v N coefficients matrix
  • W f,d,l is a N 3 N 4 ⁇ M 1 N basis matrix for (FD, DD/TD) pairs.
  • the columns of W f,d,l comprises vectors v f,d,l that are Kronecker products (KPs) of vectors g f,l and h d,l , columns of W f and W d , respectively.
  • W f is a N 3 ⁇ M v FD basis matrix (similar to Rel. 16 enhanced Type II codebook) and W d is a N 4 ⁇ N DD basis matrix.
  • At least one of the following examples is used/configured regarding the reporting of the three bases.
  • At least one of the following examples is used/configured regarding the three basis matrices.
  • n 3,l [ n 3,l (0) , . . . ,n 3,l (M v -1) ]
  • n 4,l [ n 4,l (0) , . . . ,n 4,l (N-1) ]
  • n 4,l (d) ⁇ 0,1, . . . , N 4 ⁇ 1 ⁇
  • the FD basis vectors are orthogonal DFT vectors
  • the DD/TD basis vectors are orthogonal DFT vectors
  • ⁇ u , l ( d ) e j ⁇ 2 ⁇ ⁇ ⁇ un 4 , l ( d ) N 4 .
  • the FD basis vectors are oversampled (or rotated) orthogonal DFT vectors with the oversampling (rotation) factor O 3 , and
  • the M v FD basis vectors are also identified by the rotation index q 3,l ⁇ 0, 1, . . . , O 3 ⁇ 1 ⁇ .
  • the DD/TD basis vectors are oversampled (or rotated) orthogonal DFT vectors with the oversampling (rotation) factor O 4 , and
  • ⁇ u , l ( d ) e j ⁇ 2 ⁇ ⁇ ⁇ un 4 , l ( d ) O 4 ⁇ N 4
  • the rotation index q 4,l ⁇ 0, 1, . . . , O 4 ⁇ 1 ⁇ is fixed (e.g., 4), or configured (e.g., via RRC), or reported by the UE.
  • O 4 is fixed (e.g., 4), or configured (e.g., via RRC), or reported by the UE.
  • x l,i,f,d is the coefficient (an element of ⁇ tilde over (W) ⁇ 2 ) associated with codebook indices (l, i, f, d), where i is a row index of ⁇ tilde over (W) ⁇ 2 and (f, d) determine the column index k of ⁇ tilde over (W) ⁇ 2 .
  • f k mod M v and
  • d k mod N
  • x l , i , f , d p l , ⁇ i L ⁇ ( 1 ) ⁇ p l , i , f , d ( 2 ) ⁇ ⁇ l , i , f , d
  • v m 1 (i) ,m 2 (i) is a P CSIRS ⁇ 1 or 2N 1 N 2 ⁇ 1 FD basis vector.
  • the L SD basis vectors are determined as in example I.1.1.
  • the index k determines (f, d) as explained in example I.1.1.
  • the details of g f,l and h d,l are as in example I.1.1.
  • the precoders for v layers are given by
  • x l,i,f,d is the coefficient (an element of ⁇ tilde over (W) ⁇ 2 ) associated with indices (l, i, f, d), where i is a row index of ⁇ tilde over (W) ⁇ 2 and (f, d) determine the column index k of ⁇ tilde over (W) ⁇ 2 .
  • f k mod M v and
  • d k mod N
  • x l , i , f , d p l , ⁇ i L ⁇ ( 1 ) ⁇ p l , i , f , d ( 2 ) ⁇ ⁇ l , i , f , d
  • v m 1 (i) ,m 2 (i) is a P CSIRS ⁇ 1 or 2N 1 N 2 ⁇ 1 FD basis vector.
  • the SD basis is replaced with a port selection (PS) basis, i.e., the 2L antenna ports vectors are selected from the P CSIRS CSIRS ports.
  • PS port selection
  • whether there is any selection in SD or not depends on the value of L. If
  • the SD ports are selected (hence reported), where this selection is according to at least one example described above.
  • the SD basis is analogous to the W 1 component in Rel.15/16 Type II port selection codebook (cf 5.2.2.2.3/5.2.2.2.5, REF 8), wherein the L l antenna ports or column vectors of A l are selected by the index
  • d 1, 2, 3, 4 ⁇ .
  • the port selection matrix is then given by
  • the SD basis is selected either common (the same) for the two antenna polarizations or independently for each of the two antenna polarizations.
  • the SD basis selects L l antenna ports freely, i.e., the L l antenna ports per polarization or column vectors of A l are selected freely by the index
  • the SD basis is selected either common (the same) for the two antenna polarizations or independently for each of the two antenna polarizations.
  • the SD basis selects L l antenna ports freely from P CSI-RS ports, i.e., the L l antenna ports or column vectors of A l are selected freely by the index
  • the SD basis selects 2L 1 antenna ports freely from P CSI-RS ports, i.e., the 2L 1 antenna ports or column vectors of A 1 are selected freely by the index
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) two separate basis matrices W 1 , W f , for SD, FD compression, (B) for each (SD,FD) basis vector pairs with indices (i,f), an independent/separate TD/DD basis matrix W d (i,f) for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) two separate basis matrices W 1 , W f , for SD, FD compression, (B) for each (SD,FD) basis vector pairs with indices (i,f), an independent/separate TD/DD basis matrix W d (i,f) for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • g f,l ⁇ h d,l (i) is Kronecker product (KP) of FD and TD/DD basis vectors g f,l and h d,l (i,f) .
  • KP Kronecker product
  • the set of TD/DD basis vectors ⁇ h d,l (i,f) ⁇ for each (SD,FD) basis vector pairs (v m 1 (i) ,m 2 (i) , g f,l ) is polarization-common, i.e., the same/common set of TD/DD basis vectors are determined/reported for the two antenna polarizations, a first polarization and second polarization.
  • the first polarization comprises a first group CSI-RS antenna ports
  • the second polarization comprises a second group CSI-RS antenna ports
  • the number of sets of TD/DD basis vectors is LM v (when the sets are the same for all layers) or LM v v (when the sets can be different for v layers).
  • n 4,l (i,f) [ n 4,l (0) , . . . ,n 4,l (N-1) ]
  • n 4,l (d) ⁇ 0,1, . . . , N 4 ⁇ 1 ⁇
  • the rest of the details can be the same as embodiment I.1.
  • the precoders for v layers are then given by
  • x l,i,f,d is the coefficient (an element of ⁇ tilde over (W) ⁇ 2 ) associated with codebook indices (l, i, f, d), where i is a row index of ⁇ tilde over (W) ⁇ 2 and (f, d) determine the column index k of ⁇ tilde over (W) ⁇ 2 .
  • f k mod M v and
  • d k mod N
  • x l , i , f , d p l , ⁇ i L ⁇ ( 1 ) ⁇ p l , i , f , d ( 2 ) ⁇ ⁇ l , i , f , d
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) two separate basis matrices W 1 , W f , for SD, FD compression, (B) for each (SD,FD) basis vector pairs with indices (i,f), an independent/separate TD/DD basis matrix W d (i,f) for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) two separate basis matrices W 1 , W f , for SD, FD compression, (B) for each (SD,FD) basis vector pairs with indices (i,f), an independent/separate TD/DD basis matrix W d (i,f) for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • g f,l ⁇ h d,l (i) is Kronecker product (KP) of FD and TD/DD basis vectors g f,l and h d,l (i,f) .
  • KP Kronecker product
  • the set of TD/DD basis vectors ⁇ h d,l (i,f) ⁇ for each (SD,FD) basis vector pairs (v m 1 (i) ,m 2 (i) ,g f,l ) is polarization-specific or polarization-independent, i.e., the set of TD/DD basis vectors are determined/reported for each polarizations.
  • the number of sets of TD/DD basis vectors is 2LM (when the sets are the same for all layers) or 2LM v v (when the sets can be different for v layers).
  • n 4,l (i,f) [ n 4,l (0) , . . . ,n 4,l (N-1) ]
  • n 4,l (d) ⁇ 0,1, . . . , N 4 ⁇ 1 ⁇
  • the rest of the details can be the same as embodiment I.1.
  • the precoders for v layers are then given by
  • x l,i,f,d is the coefficient (an element of ⁇ tilde over (W) ⁇ 2 ) associated with codebook indices (l, i, f, d), where i is a row index of ⁇ tilde over (W) ⁇ 2 and (f, d) determine the column index k of ⁇ tilde over (W) ⁇ 2 .
  • f k mod M v and
  • d k mod N
  • x l , i , f , d p l , ⁇ i L ⁇ ( 1 ) ⁇ p l , i , f , d ( 2 ) ⁇ ⁇ l , i , f , d
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) two separate basis matrices W 1 , W f , for SD, FD compression, (B) for each SD basis vector with index i, an independent/separate TD/DD basis matrix W d for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) two separate basis matrices W 1 , W f , for SD, FD compression, (B) for each SD basis vector with index i, an independent/separate TD/DD basis matrix W d for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • g f,l ⁇ h d,l (i) is Kronecker product (KP) of FD and TD/DD basis vectors g f,l and h d,l (i)
  • KP Kronecker product
  • the set of TD/DD basis vectors ⁇ h d,l (i) ⁇ for each SD basis vector v m 1 (i) ,m 2 (i) is polarization-common, i.e., the same/common set of TD/DD basis vectors are determined/reported for the two antenna polarizations, a first polarization and second polarization.
  • the first polarization comprises a first group CSI-RS antenna ports
  • the second polarization comprises a second group CSI-RS antenna ports
  • the number of sets of TD/DD basis vectors is L (when the sets are the same for all layers) or Lv (when the sets can be different for v layers).
  • n 4,l (i) [ n 4,l (0) , . . . ,n 4,l (N-1) ]
  • n 4,l (d) ⁇ 0,1, . . . , N 4 ⁇ 1 ⁇
  • DD/TD index u ⁇ 0, 1, . . . , N 4 ⁇ 1 ⁇ , which is an (DD/TD) index associated with the precoding matrix.
  • the rest of the details can be the same as embodiment I.1.
  • the precoders for v layers are then given by
  • x l,i,f,d is the coefficient (an element of ⁇ tilde over (W) ⁇ 2 ) associated with codebook indices (l, i, f, d), where i is a row index of ⁇ tilde over (W) ⁇ 2 and (f, d) determine the column index k of ⁇ tilde over (W) ⁇ 2 .
  • f k mod M v and
  • d k mod N
  • x l , i , f , d p l , ⁇ i L ⁇ ( 1 ) ⁇ p l , i , f , d ( 2 ) ⁇ ⁇ l , i , f , d
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) two separate basis matrices W 1 , W f , for SD, FD compression, (B) for each SD basis vector with index i, an independent/separate TD/DD basis matrix W d for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) two separate basis matrices W 1 , W f , for SD, FD compression, (B) for each SD basis vector with index i, an independent/separate TD/DD basis matrix W d for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • g f,l ⁇ h d,l (i) is Kronecker product (KP) of FD and TD/DD basis vectors g f,l and h d,l (i) .
  • KP Kronecker product
  • the set of TD/DD basis vectors ⁇ h d,l (i) ⁇ for each SD basis vector v m 1 (i) ,m 2 (i) is polarization-specific or polarization-independent, i.e., the set of TD/DD basis vectors are determined/reported for each polarizations. So, the number of sets of TD/DD basis vectors is 2L (when the sets are the same for all layers) or 2Lv (when the sets can be different for v layers).
  • n 4,l (i) [ n 4,l (0) , . . . ,n 4,l (N-1) ]
  • n 4,l (d) ⁇ 0,1, . . . , N 4 ⁇ 1 ⁇
  • DD/TD index u ⁇ 0, 1, . . . , N 4 ⁇ 1 ⁇ , which is an (DD/TD) index associated with the precoding matrix.
  • the rest of the details can be the same as embodiment I.1.
  • the precoders for v layers are then given by
  • x l,i,f,d is the coefficient (an element of ⁇ tilde over (W) ⁇ 2 ) associated with codebook indices (l, i, f, d), where i is a row index of ⁇ tilde over (W) ⁇ 2 and (f, d) determine the column index k of ⁇ tilde over (W) ⁇ 2 .
  • f k mod M v and
  • d k mod N
  • x l , i , f , d p l , ⁇ i L ⁇ ( 1 ) ⁇ p l , i , f , d ( 2 ) ⁇ ⁇ l , i , f , d
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) one SD basis matrix W 1 for SD compression, (B) for each SD basis vector with index i, an independent/separate W f for FD compression and an independent/separate TD/DD basis matrix W d (i) for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) one SD basis matrix W 1 for SD compression, (B) for each SD basis vector with index i, an independent/separate W f for FD compression and an independent/separate TD/DD basis matrix W d (i) for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • g f,l (i) ⁇ h d,l (i) is Kronecker product (KP) of FD and TD/DD basis vectors g f,l (i) and h d,l (i) .
  • KP Kronecker product
  • the set of FD basis vectors ⁇ g f,l (i) ⁇ and TD/DD basis vectors ⁇ h d,l (i) ⁇ for each SD basis vector v m 1 (i) ,m 2 (i) is polarization-common, i.e., the same/common set of FD basis vectors and TD/DD basis vectors are determined/reported for the two antenna polarizations, a first polarization and second polarization.
  • the first polarization comprises a first group CSI-RS antenna ports
  • the second polarization comprises a second group CSI-RS antenna ports
  • the number of sets of FD basis vectors is L (when the sets are the same for all layers) or Lv (when the sets can be different for v layers).
  • the number of sets of TD/DD basis vectors is L (when the sets are the same for all layers) or Lv (when the sets can be different for v layers).
  • n 4,l (i) [ n 4,l (0) , . . . ,n 4,l (N-1) ]
  • n 4,l (d) ⁇ 0,1, . . . , N 4 ⁇ 1 ⁇
  • DD/TD index u ⁇ 0, 1, . . . , N 4 ⁇ 1 ⁇ , which is an (DD/TD) index associated with the precoding matrix.
  • the rest of the details can be the same as embodiment I.1.
  • the precoders for v layers are then given by
  • x l,i,f,d is the coefficient (an element of ⁇ tilde over (W) ⁇ 2 ) associated with codebook indices (l, i, f, d), where i is a row index of ⁇ tilde over (W) ⁇ 2 and (f, d) determine the column index k of ⁇ tilde over (W) ⁇ 2 .
  • f k mod M v and
  • d k mod N
  • x l , i , f , d p l , ⁇ i L ⁇ ( 1 ) ⁇ p l , i , f , d ( 2 ) ⁇ ⁇ l , i , f , d
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) one SD basis matrix W 1 for SD compression, (B) for each SD basis vector with index i, an independent/separate W f for FD compression and an independent/separate TD/DD basis matrix W d (i) for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) one SD basis matrix W 1 for SD compression, (B) for each SD basis vector with index i, an independent/separate W f for FD compression and an independent/separate TD/DD basis matrix W d (i) for DD or TD compression, and (C) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • g f,l ⁇ h d,l (i) is Kronecker product (KP) of FD and TD/DD basis vectors g f,l (i) and h d,l (i) .
  • KP Kronecker product
  • the set of FD basis vectors ⁇ g f,l (i) ⁇ and TD/DD basis vectors ⁇ h d,l (i) ⁇ for each SD basis vector v m 1 (i) ,m 2 (i) is polarization-specific or polarization-independent, i.e., the set of TD/DD basis vectors are determined/reported for each polarizations.
  • the number of sets of FD basis vectors is 2L (when the sets are the same for all layers) or 2Lv (when the sets can be different for v layers).
  • the number of sets of TD/DD basis vectors is 2L (when the sets are the same for all layers) or 2Lv (when the sets can be different for v layers).
  • n 4,l (i) [ n 4,l (0) , . . . ,n 4,l (N-1) ]
  • n 4,l (d) ⁇ 0,1, . . . , N 4 ⁇ 1 ⁇
  • DD/TD index u ⁇ 0, 1, . . . , N 4 ⁇ 1 ⁇ , which is an (DD/TD) index associated with the precoding matrix.
  • the rest of the details can be the same as embodiment 1.1.
  • the precoders for v layers are then given by
  • x l,i,f,d is the coefficient (an element of ⁇ tilde over (W) ⁇ 2 ) associated with codebook indices (l, i, f, d), where i is a row index of ⁇ tilde over (W) ⁇ 2 and (f, d) determine the column index k of ⁇ tilde over (W) ⁇ 2 .
  • f k mod M v and
  • d k mod N
  • x l , i , f , d p l , ⁇ i L ⁇ ( 1 ) ⁇ p l , i , f , d ( 2 ) ⁇ ⁇ l , i , f , d
  • PS port selection
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) two basis matrices, basis W 1 for SD, and a joint basis W joint for joint FD and DD/TD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) two basis matrices, basis W 1 for SD, and a joint basis W joint for joint FD and DD/TD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • W 1 is a P CSIRS ⁇ N 3 N 4 matrix whose columns are precoding vectors for a total of N 3 N 4 units, N 3 FD units and N 4 DD/TD units, W 1 is a P CSIRS ⁇ 2L or P CSIRS ⁇ L SD basis matrix (similar to Rel. 16 enhanced Type II codebook), ⁇ tilde over (W) ⁇ 2 is a 2L ⁇ M v coefficients matrix, and W joint is a N 3 N 4 ⁇ M v basis matrix comprising M v joint (FD, DD/TD) basis vectors.
  • v k,l [g k,l ⁇ 0,l (k) g k,l (k) ⁇ 1,l (k) . . . g k,l ⁇ N 4 -1,l (k) ] T , the KP of g k,l and h k,l .
  • v k,l [y 0,l (k) y 1,l (k) . . . y N 3 -1,l (k) ] T , the KP of g k,l and h k,l .
  • g k,l [u 0,l (k) y 1,l (k) . . . y N 3 -1,1 (k) ]
  • h k,l [ ⁇ 0,l (k) ⁇ 1,l (k) . . . ⁇ N 4 -1,l (k) ].
  • At least one of the following examples is used/configured regarding the reporting of the two bases.
  • At least one of the following examples is used/configured regarding the three basis matrices.
  • the SD basis W 1 is as described in one or more examples described above.
  • n joint,l n joint,l (0) , . . . ,n joint,l (M v -1)
  • the M v joint (FD, DD/TD) vectors are reported jointly, similar to L basis reporting for W 1 (cf. Section 5.2.2.2.3, REF 8).
  • the M v vectors can be identified by the indices i joint,1 and i joint,2 , where
  • n joint,l (k) ⁇ 1, . . . , N 3 N 4 ⁇ 1 ⁇
  • n joint,l (k) corresponds (maps) to (n 3,l (k) ,n 4,l (k) ).
  • n 3,l [ n 3,l (0) , . . . ,n 3,l (M v -1) ]
  • n 4,l [ n 4,l (0) , . . . ,n 4,l (M v -1) ]
  • n 4,l (k) ⁇ 0,1, . . . , N 4 ⁇ 1 ⁇
  • the joint (FD, DD/TD) basis vectors are oversampled (or rotated) orthogonal DFT vectors with the oversampling (rotation) factor O 3 and O 4 , and
  • the M v joint (FD, DD/TD) basis vectors are also identified by the rotation indices q 3,l ⁇ 0, 1, . . . , O 3 ⁇ 1 ⁇ and q 4,l ⁇ 0, 1, . . . , O 4 ⁇ 1 ⁇ .
  • O 3 is fixed (e.g., 4), or configured (e.g., via RRC), or reported by the UE.
  • O 4 is fixed (e.g., 4), or configured (e.g., via RRC), or reported by the UE.
  • x l,i,k is the coefficient (an element of ⁇ tilde over (W) ⁇ 2 ) associated with codebook indices (l, i, k), where i is a row index of ⁇ tilde over (W) ⁇ 2 and k is the column index of ⁇ tilde over (W) ⁇ 2 .
  • x l , i , k p l , ⁇ i L ⁇ ( 1 ) ⁇ p l , i , k ( 2 ) ⁇ ⁇ l , i , k
  • v m 1 (i) ,m 2 (i) is a P CSIRS ⁇ 1 or 2N 1 N 2 ⁇ 1 FD basis vector.
  • the SD basis is replaced with a port selection (PS) basis, i.e., the 2L antenna ports vectors are selected from the P CSIRS CSIRS ports.
  • PS port selection
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) two basis matrices, basis W 1 for SD, and a joint basis W joint for joint FD and DD/TD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) two basis matrices, basis W 1 for SD, and a joint basis W joint for joint FD and DD/TD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • W 1 is a P CSIRS ⁇ N 3 N 4 matrix whose columns are precoding vectors for a total of N 3 N 4 units, N 3 FD units and N 4 DD/TD units, W 1 is a P CSIRS ⁇ 2L or P CSIRS ⁇ L SD basis matrix (similar to Rel. 16 enhanced Type II codebook), ⁇ tilde over (W) ⁇ 2 is a 2L ⁇ M v coefficients matrix, and W joint is a N 3 N 4 ⁇ M v basis matrix comprising M v joint (FD, DD/TD) basis vectors.
  • v k,l [m 0,l , m 1,l , m N 3 N 4 ,l ] T .
  • v k,l is the k-th DFT vector on length N 3 N 4 , i.e.
  • v k,l is the k-th oversampled DFT vector on length N 3 N 4 , i.e.,
  • O is the oversampling factor.
  • O is fixed (e.g., 4).
  • O is configured (e.g., via RRC).
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) two basis matrices, basis W d,1 or W 1,d for joint SD and DD/TD compression, and a basis W f for FD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) two basis matrices, basis W d,1 or W 1,d for joint SD and DD/TD compression, and a basis W f for FD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • W 1 is a P CSIRS N 4 ⁇ N 3 matrix whose each column (f) comprises precoding vectors for N 4 DD/TD units and a given FD unit f
  • W 1 is a P CSIRS ⁇ 2L or P CSIRS ⁇ L SD basis matrix (similar to Rel. 16 enhanced Type II codebook)
  • W f is a N 3 ⁇ M v FD basis matrix (similar to Rel. 16 enhanced Type II codebook)
  • W d is a N 4 ⁇ N DD/TD basis matrix.
  • the ⁇ tilde over (W) ⁇ 2 is (2LN) ⁇ (M v ) coefficient matrix.
  • the precoder for layer l is given by
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) two basis matrices, basis W f,1 or W 1,f for joint SD and FD compression, and a basis W d for DD/TD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) two basis matrices, basis W f,1 or W 1,f for joint SD and FD compression, and a basis W d for DD/TD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the precoder for layer l is given by
  • W l is a P CSIRS N 3 ⁇ N 4 matrix whose each column (d) comprises precoding vectors for N 3 FD units and a given DD/TD unit d
  • W 1 is a P CSIRS ⁇ 2L or P CSIRS ⁇ L SD basis matrix (similar to Rel. 16 enhanced Type II codebook)
  • W f is a N 3 ⁇ M v FD basis matrix (similar to Rel. 16 enhanced Type II codebook)
  • W d is a N 4 ⁇ N DD/TD basis matrix.
  • the ⁇ tilde over (W) ⁇ 2 is (2LM v ) ⁇ (N) coefficient matrix.
  • the precoder for layer l is given by
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) three separate basis matrices W 1 , W f , and W d for SD, FD, and DD/TD compression, respectively, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the details of the components are as explained in embodiment 1.1 except that only 2 out of the 3 basis matrices are used for dimension reduction or compression, and the third basis is either fixed (e.g., 1 or identity matrix) or turned OFF (e.g., via explicit or implicit higher layer or MAC CE or DCI based signalling).
  • the CSI (or PMI) reporting can correspond to only one value (similar to WB PMI reporting format) or multiple values (similar to SB PMI reporting format). In one example, this reporting is fixed (e.g., to one value) or configurable (e.g., via RRC) or reported by the UE (e.g., as part of UE capability or CSI reporting).
  • the component W 1 can correspond to regular (e.g., DFT based similar to Rel. enhanced Type II codebook) or port selection (e.g., similar to Rel. 16 enhanced port selection Type II codebook).
  • regular e.g., DFT based similar to Rel. enhanced Type II codebook
  • port selection e.g., similar to Rel. 16 enhanced port selection Type II codebook
  • the 2 bases used for dimension reduction or compression correspond to SD and FD bases
  • the 3 rd basis corresponds to the DD/TD basis.
  • W l W 1 ⁇ tilde over (W) ⁇ 2 W f H (without W d ).
  • the 2 bases used for dimension reduction or compression correspond to SD and DD/TD bases
  • the 3 rd basis corresponds to the FD basis.
  • W l W 1 ⁇ tilde over (W) ⁇ 2 W d (without W f ).
  • the 2 bases used for dimension reduction or compression correspond to FD and DD/TD bases
  • the 3 rd basis corresponds to the SD basis.
  • W l ⁇ tilde over (W) ⁇ 2 W f H (without W 1 ).
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) two basis matrices, basis W 1 for SD, and a joint basis W joint for joint FD and DD/TD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • a codebook comprising components: (A) two basis matrices, basis W 1 for SD, and a joint basis W joint for joint FD and DD/TD compression, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the details of the components are as explained above except that only W joint is used for dimension reduction or compression, and the W 1 basis is either fixed (e.g., 1 or identity matrix) or turned OFF (e.g., via explicit or implicit higher layer or MAC CE or DCI based signalling).
  • the UE is configured to report a CSI determined based on a codebook comprising components: (A) three separate basis matrices W 1 , W f , and W d for SD, FD, and DD/TD compression, respectively, and (B) coefficients ⁇ tilde over (W) ⁇ 2 .
  • the details of the components are as explained in embodiment 1.1 except that only 1 out of the 3 basis matrices is used for dimension reduction or compression, and one or both of the other two bases is either fixed (e.g., 1 or identity matrix) or turned OFF (e.g., via explicit or implicit higher layer or MAC CE or DCI based signalling).
  • the CSI (or PMI) reporting can correspond to only one value (similar to WB PMI reporting format) or multiple values (similar to SB PMI reporting format). In one example, this reporting is fixed (e.g., to one value) or configurable (e.g., via RRC) or reported by the UE (e.g., as part of UE capability or CSI reporting).
  • the component W 1 can correspond to regular (e.g., DFT based similar to Rel. enhanced Type II codebook) or port selection (e.g., similar to Rel. 16 enhanced port selection Type II codebook).
  • regular e.g., DFT based similar to Rel. enhanced Type II codebook
  • port selection e.g., similar to Rel. 16 enhanced port selection Type II codebook
  • the one basis used for dimension reduction or compression corresponds to SD, and the other two bases correspond to the FD and DD/TD basis.
  • W l W 1 ⁇ tilde over (W) ⁇ 2 (without W f and W d ).
  • the one basis used for dimension reduction or compression corresponds to FD, and the other two bases correspond to the SD and DD/TD basis.
  • W l ⁇ tilde over (W) ⁇ 2 W f H (without W 1 and W d ).
  • the one basis used for dimension reduction or compression corresponds to DD/TD, and the other two bases correspond to the SD and FD basis.
  • W l ⁇ tilde over (W) ⁇ 2 W d (without W 1 and W d ).
  • FIG. 16 illustrates a flow chart of a method 1600 for operating a UE, as may be performed by a UE such as UE 116 , according to embodiments of the present disclosure.
  • the embodiment of the method 1600 illustrated in FIG. 16 is for illustration only. FIG. 16 does not limit the scope of this disclosure to any particular implementation.
  • the method 1600 begins at step 1602 .
  • the UE e.g., 111 - 116 as illustrated in FIG. 1
  • receives a configuration about a CSI report the configuration including information about a codebook, the codebook comprising components: (i) sets of basis vectors including a first set of vectors each of length P CSIRS ⁇ 1 for a SD, a second set of vectors each of length N 3 ⁇ 1 for a FD, and a third set of vectors each of length N 4 ⁇ 1 for a DD, and (ii) coefficients associated with each basis vector triple (a i , b f , c d ), a t from the first set, b f from the second set, and c d from the third set.
  • step 1604 the UE determines, based on the configuration, the components.
  • the UE transmits the CSI report including: at least one basis vector indicator indicating all or a portion of the sets of basis vectors, and at least one coefficient indicator indicating all or a portion of the coefficients, wherein N 3 and N 4 are total number of FD and DD units respectively, and wherein P CSIRS is a number of CSI-RS ports configured for the CSI report.
  • a precoding vector of length P CSIRS ⁇ 1 for a layer l E ⁇ 1, . . . , v ⁇ is based on: a first sum over the first set of SD basis vectors, a second sum over the second set of FD vectors, and a third sum over the third set DD vectors, where the precoding vector is given by:
  • L is a number of basis vectors in the first set
  • M v is a number of basis vectors in the second set
  • N is a number of basis vectors in the third set
  • v m 1 (i) ,m 2 (i) is a vector of length
  • y t,l (i,f) is a t-th element of an f-th FD basis vector of length N 3 ⁇ 1 in the second set
  • ⁇ u,l (i,d) is a u-th element of a d-th DD basis vector of length N 4 ⁇ 1 in the third set
  • ⁇ is a normalization factor
  • v is a number of layers.
  • the first and the second sets of basis vectors for SD and FD respectively are independent
  • the third set of basis vectors comprises a set of DD basis vectors ⁇ c d (i,f) ⁇ for each (SD, FD) basis vector pair (a i ,b f ).
  • the first and the second sets of basis vectors for SD and FD respectively are independent, and the third set of basis vectors comprises a set of DD basis vectors ⁇ c d (i) ⁇ for each SD basis vector a i .
  • the first set of basis vectors for SD is independent
  • the second set of basis vectors comprises a set of FD basis vectors ⁇ b f (i) ⁇ for each SD basis vector a i
  • the third set of basis vectors comprises a set of DD basis vectors ⁇ c d (i) ⁇ for each SD basis vector a i .
  • the first set of basis vectors for SD is independent
  • the second and the third sets of basis vectors comprise sets ⁇ b f (i) ⁇ and ⁇ c d (i) ⁇ for each SD basis vector a i
  • ⁇ b f (i) ⁇ and ⁇ c d (i) ⁇ are vectors from a joint set of FD and DD basis vector pairs ⁇ (b f (i) ,c d (i) ) ⁇ .
  • one of the sets of basis vectors is set to an identity matrix.
  • the first set of SD basis vectors comprises either DFT vectors or port selection vectors
  • the second set of FD basis vectors comprises DFT vectors
  • the third set of DD basis vectors comprises DFT vectors.
  • FIG. 17 illustrates a flow chart of another method 1700 , as may be performed by a base station (BS) such as BS 102 , according to embodiments of the present disclosure.
  • BS base station
  • the embodiment of the method 1700 illustrated in FIG. 17 is for illustration only. FIG. 17 does not limit the scope of this disclosure to any particular implementation.
  • the method 1700 begins at step 1702 .
  • the BS e.g., 101 - 103 as illustrated in FIG. 1
  • the configuration including information about a codebook, the codebook comprising components: (i) sets of basis vectors including a first set of vectors each of length P CSIRS ⁇ 1 for a SD, a second set of vectors each of length N 3 ⁇ 1 for a FD, and a third set of vectors each of length N 4 ⁇ 1 for a DD, and (ii) coefficients associated with each basis vector triple (a i ,b f ,c d ), a i from the first set, b f from the second set, and c d from the third set.
  • CSI channel state information
  • step 1704 the BS transmits the configuration.
  • the BS receives the CSI report based on the configuration, wherein the CSI report includes: at least one basis vector indicator indicating all or a portion of the sets of basis vectors, and at least one coefficient indicator indicating all or a portion of the coefficients, wherein N 3 and N 4 are total number of FD and DD units respectively, and wherein P CSIRS is a number of CSI-RS ports configured for the CSI report.
  • a precoding vector of length P CSIRS ⁇ 1 for a layer l E ⁇ 1, . . . , v ⁇ is based on: a first sum over the first set of SD basis vectors, a second sum over the second set of FD vectors, and a third sum over the third set DD vectors, where the precoding vector is given by:
  • L is a number of basis vectors in the first set
  • M v is a number of basis vectors in the second set
  • N is a number of basis vectors in the third set
  • v m 1 (i) ,m 2 (i) is a vector of length
  • y (t,l (i,f) is a t-th element of an f-th FD basis vector of length N 3 ⁇ 1 in the second set
  • ⁇ u,l (i,d) is a u-th element of a d-th DD basis vector of length N 4 ⁇ 1 in the third set
  • ⁇ is a normalization factor
  • v is a number of layers.
  • the first and the second sets of basis vectors for SD and FD respectively are independent
  • the third set of basis vectors comprises a set of DD basis vectors ⁇ c d (i,f) ⁇ for each (SD, FD) basis vector pair (a i ,b f ).
  • the first and the second sets of basis vectors for SD and FD respectively are independent, and the third set of basis vectors comprises a set of DD basis vectors ⁇ c d (i) ⁇ for each SD basis vector a i .
  • the first set of basis vectors for SD is independent
  • the second set of basis vectors comprises a set of FD basis vectors ⁇ b f (i) ⁇ for each SD basis vector a i
  • the third set of basis vectors comprises a set of DD basis vectors ⁇ c d (i) ⁇ for each SD basis vector a i .
  • the first set of basis vectors for SD is independent
  • the second and the third sets of basis vectors comprise sets ⁇ b f (i) ⁇ and ⁇ c d (i) ⁇ for each SD basis vector a i
  • ⁇ b f (i) ⁇ and ⁇ c d (i) ⁇ are vectors from a joint set of FD and DD basis vector pairs ⁇ (b f (i) ,c d (i) ) ⁇ .
  • one of the sets of basis vectors is set to an identity matrix.
  • the first set of SD basis vectors comprises either DFT vectors or port selection vectors
  • the second set of FD basis vectors comprises DFT vectors
  • the third set of DD basis vectors comprises DFT vectors.

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PCT/KR2022/010721 WO2023003401A1 (fr) 2021-07-23 2022-07-21 Procédé et appareil de rapport de csi basé sur la compression
KR1020247002661A KR20240036013A (ko) 2021-07-23 2022-07-21 압축 기반 csi 보고를 위한 방법 및 장치
EP22846271.9A EP4360229A1 (fr) 2021-07-23 2022-07-21 Procédé et appareil de rapport de csi basé sur la compression
CN202280051848.XA CN117813774A (zh) 2021-07-23 2022-07-21 用于基于压缩的csi报告的方法和装置
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4233187A4 (fr) * 2020-12-17 2024-04-24 Samsung Electronics Co Ltd Livre de codes à haute résolution pour transmission mimo distribuée

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220029676A1 (en) * 2019-03-08 2022-01-27 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Csi reporting and codebook structure for doppler-delay codebook-based precoding in a wireless communications system
US20220182120A1 (en) * 2019-02-14 2022-06-09 Apple Inc. Method of type ii csi reporting for multiple spatial layers
US20230131045A1 (en) * 2020-02-14 2023-04-27 Qualcomm Incorporated Indication of information in channel state information (csi) reporting

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3576361A1 (fr) * 2018-06-01 2019-12-04 FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. Rétroaction d'informations de canal explicite sur la base d'une décomposition de pca ou d'une composition de pca d'ordre supérieur
EP4018687A4 (fr) * 2019-08-23 2023-05-31 Qualcomm Incorporated Mappage et omission de csi avec compression td
CN114557073A (zh) * 2019-11-29 2022-05-27 中兴通讯股份有限公司 用于无线信道参考信号传输和信道状态信息反馈的方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220182120A1 (en) * 2019-02-14 2022-06-09 Apple Inc. Method of type ii csi reporting for multiple spatial layers
US20220029676A1 (en) * 2019-03-08 2022-01-27 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Csi reporting and codebook structure for doppler-delay codebook-based precoding in a wireless communications system
US20230131045A1 (en) * 2020-02-14 2023-04-27 Qualcomm Incorporated Indication of information in channel state information (csi) reporting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4233187A4 (fr) * 2020-12-17 2024-04-24 Samsung Electronics Co Ltd Livre de codes à haute résolution pour transmission mimo distribuée

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