US20200162142A1 - Method and apparatus to enable csi reporting in wireless communication systems - Google Patents

Method and apparatus to enable csi reporting in wireless communication systems Download PDF

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Publication number
US20200162142A1
US20200162142A1 US16/683,070 US201916683070A US2020162142A1 US 20200162142 A1 US20200162142 A1 US 20200162142A1 US 201916683070 A US201916683070 A US 201916683070A US 2020162142 A1 US2020162142 A1 US 2020162142A1
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Prior art keywords
coefficients
amplitude
coefficient
reported
group
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US16/683,070
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English (en)
Inventor
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 US16/683,070 priority Critical patent/US20200162142A1/en
Priority to KR1020217014660A priority patent/KR102534939B1/ko
Priority to CN201980075552.XA priority patent/CN113039728A/zh
Priority to JP2021527056A priority patent/JP7214297B2/ja
Priority to PCT/KR2019/015712 priority patent/WO2020101454A1/en
Priority to EP19884443.3A priority patent/EP3864767A4/en
Publication of US20200162142A1 publication Critical patent/US20200162142A1/en
Priority to US17/304,360 priority patent/US11381295B2/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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—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
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • 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

Definitions

  • the present disclosure relates generally to CSI reporting in wireless communication systems.
  • the UE may report (e.g., feedback) information about channel measurement, e.g., CSI, to the gNB.
  • CSI channel measurement
  • 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 to enable CSI reporting in wireless communication systems.
  • a user equipment (UE) for a channel state information (CSI) feedback in a wireless communication system comprises a transceiver configured to receive, from a base station (BS), CSI feedback configuration information.
  • the UE further comprises a processor operably connected to the transceiver, the processor configured to derive, based on the CSI feedback configuration information, the CSI feedback including a precoding matrix indicator (PMI).
  • PMI precoding matrix indicator
  • 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. 4A illustrates a high-level diagram of an orthogonal frequency division multiple access transmit path according to embodiments of the present disclosure
  • FIG. 4B 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 multiplexing of two slices according to embodiments of the present disclosure.
  • FIG. 10 illustrates an example antenna blocks according to embodiments of the present disclosure
  • FIG. 11 illustrates an example network configuration according to embodiments of the present disclosure
  • FIG. 12 illustrates an example antenna port layout according to embodiments of the present disclosure
  • FIG. 13 illustrates an example 3D grid of DFT beams according to embodiments of the present disclosure
  • FIG. 14 illustrates an example coefficient groups according to embodiments of the present disclosure
  • FIG. 15 illustrates an example two-part UCI multiplexing according to embodiments of the present disclosure
  • FIG. 16 illustrates another example two-part UCI multiplexing according to embodiments of the present disclosure.
  • FIG. 17 illustrates a flowchart of a method for CSI reporting 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 present disclosure covers several components which can be used in conjunction or in combination with another, or can operate as standalone schemes.
  • 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.
  • 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 cancellation and the like.
  • CoMP coordinated multi-points
  • FQAM frequency shift keying and quadrature amplitude modulation
  • SWSC sliding window superposition coding
  • AMC adaptive modulation and coding
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • FIGS. 1-4B 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 the present disclosure.
  • the wireless network includes a gNB 101 (e.g., base station (BS)), 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 (SB); 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, programming, or a combination thereof, for CSI reporting in an advanced wireless communication system.
  • one or more of the gNBs 101 - 103 includes circuitry, programming, or a combination thereof, for CSI acquisition in an advanced wireless communication system.
  • 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 the present 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 forward channel signals and the transmission of reverse 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 the present 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 an 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 forward channel signals and the transmission of reverse 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 CSI reporting on uplink channel.
  • 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. 4A 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. 4B 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. 4A 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 the present disclosure document may be implemented as configurable software algorithms, where the value of Size N may be modified according to the implementation.
  • the present disclosure is directed to an embodiment that implements the Fast Fourier Transform and the Inverse Fast Fourier Transform, this is by way of illustration only and may not be construed to limit the scope of the disclosure. It may be appreciated that in an alternate embodiment of the present disclosure, the Fast Fourier Transform functions and the Inverse Fast Fourier Transform functions may easily be replaced by discrete Fourier transform (DFT) functions and inverse discrete Fourier transform (IDFT) functions, respectively.
  • DFT discrete Fourier transform
  • IDFT inverse discrete Fourier transform
  • 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.
  • Parallel-to-serial block 420 converts (i.e., multiplexes) the parallel time-domain output symbols from Size N IFFT block 415 to produce a serial time-domain signal.
  • Add cyclic prefix block 425 then inserts a cyclic prefix to the time-domain signal.
  • up-converter 430 modulates (i.e., up-converts) the output of add cyclic prefix block 425 to RF frequency for transmission via a wireless channel.
  • the signal may also be filtered at baseband before conversion to RF frequency.
  • the transmitted RF signal arrives at the UE 116 after passing through the wireless channel, and reverse operations to those at the gNB 102 are performed.
  • Down-converter 455 down-converts the received signal to baseband frequency
  • remove cyclic prefix block 460 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 gNB s 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 (BS s) 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 SIB s 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 N sc RB sub-carriers, or resource elements (REs), such as 12 REs.
  • a unit of one RB over one subframe is referred to as a PRB.
  • UL signals can include data signals conveying data information, control signals conveying UL control information (UCI), and UL RS.
  • UL RS includes DMRS and Sounding RS (SRS).
  • a UE transmits DMRS only in a BW of a respective PUSCH or PUCCH.
  • An eNodeB can use a DMRS to demodulate data signals or UCI signals.
  • a UE transmits SRS to provide an eNodeB with an UL CSI.
  • a UE transmits data information or UCI through a respective physical UL shared channel (PUSCH) or a Physical UL control channel (PUCCH). If a UE needs to transmit data information and UCI in a same UL subframe, the UE may multiplex both in a PUSCH.
  • PUSCH physical UL shared channel
  • PUCCH Physical UL control channel
  • 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.
  • An UL subframe includes two slots. Each slot includes N symb UL symbols for transmitting data information, UCI, DMRS, or SRS.
  • a frequency resource unit of an UL system BW is an RB.
  • a UE is allocated N RB RBs for a total of N RB ⁇ N sc RB REs for a transmission BW.
  • N RB 1.
  • a last subframe symbol can be used to multiplex SRS transmissions from one or more UEs.
  • 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.
  • FIG. 5 does not limit the scope of the present 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.
  • FIG. 6 does not limit the scope of the present 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.
  • FIG. 7 does not limit the scope of the present 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.
  • FIG. 8 does not limit the scope of the present 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 has 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.
  • network slicing In order for the 5G network to support such diverse services with different quality of services (QoS), one method has been identified in 3GPP specification, called network slicing. To utilize PHY resources efficiently and multiplex various slices (with different resource allocation schemes, numerologies, and scheduling strategies) in DL-SCH, a flexible and self-contained frame or subframe design is utilized.
  • FIG. 9 illustrates an example multiplexing of two slices 900 according to embodiments of the present disclosure.
  • the embodiment of the multiplexing of two slices 900 illustrated in FIG. 9 is for illustration only.
  • FIG. 9 does not limit the scope of the present disclosure to any particular implementation of the multiplexing of two slices 900 .
  • a slice can be composed of one or two transmission instances where one transmission instance includes a control (CTRL) component (e.g., 920 a , 960 a , 960 b , 920 b , or 960 c ) and a data component (e.g., 930 a , 970 a , 970 b , 930 b , or 970 c ).
  • CTRL control
  • the two slices are multiplexed in frequency domain whereas in embodiment 950 , the two slices are multiplexed in time domain.
  • 3GPP specification supports up to 32 CSI-RS antenna ports which enable an 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. 10 illustrates an example antenna blocks 1000 according to embodiments of the present disclosure.
  • the embodiment of the antenna blocks 1000 illustrated in FIG. 10 is for illustration only.
  • FIG. 10 does not limit the scope of the present disclosure to any particular implementation of the antenna blocks 1000 .
  • 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. 10 .
  • one CSI-RS port is mapped onto a large number of antenna elements which can be controlled by a bank of analog phase shifters.
  • One CSI-RS port can then correspond to one sub-array which produces a narrow analog beam through analog beamforming. This analog beam can be configured to sweep across a wider range of angles 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 Ncsr-PoRT
  • a digital beamforming unit 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
  • 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.
  • CSI-RS For beamformed CSI-RS, beamforming operation, either cell-specific or UE-specific, is applied on a non-zero-power (NZP) CSI-RS resource (including multiple ports).
  • NZP non-zero-power
  • CSI-RS 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 eNB perspective) at least some CSI-RS port-resource combinations have different beam directions.
  • 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 its representation thereof).
  • T1 ⁇ T2 periodicity
  • MIMO has been identified as an essential feature in order to achieve high system throughput requirements and it may 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).
  • TDD the CSI can be acquired using the SRS transmission relying on the channel reciprocity.
  • FDD FDD systems, on the other hand, it can be acquired using the CSI-RS transmission from eNB, and CSI acquisition and feedback from UE.
  • the CSI feedback framework is ‘implicit’ in the form of CQI/PMI/RI (and CRI in Rel. 13) derived from a codebook assuming SU transmission from eNB.
  • Type I CSI reporting For 5G or NR systems (Rel. 15), [REF7, REF8], the above-mentioned CSI reporting paradigm from LTE is also supported and referred to as Type I CSI reporting.
  • 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.
  • Type I or Type II CSI reported using a PMI codebook, where the PMI has two components, the first PMI i1 and the second PMI i2.
  • the UE reports a single wideband first PMI i1 which indicates a group of beams/pre-coders, and one second PMI i2 for each subband which indicates a precoder belonging to the group of precoders indicated by the reported first PMI i1.
  • the subband CSI reporting is generally configured for use cases such as MU-MIMO transmission since the precoding is known to be frequency-selective (i.e., varies from one subband to another subband). The system performance depends on the PMI codebook.
  • the PMI codebook for Type I CSI reporting performs worse than that for Type II CSI reporting, but the performance is proportional to the size of the PMI codebook which determines the CSI reporting payload (number of feedback bits).
  • the Type I CSI reporting payload is much smaller than the Type II CSI reporting payload. So, the system performance gain is directly proportional to the PMI codebook and hence to the CSI reporting payload.
  • FIG. 11 illustrates an example network configuration 1100 according to embodiments of the present disclosure.
  • the embodiment of the network configuration 1100 illustrated in FIG. 11 is for illustration only.
  • FIG. 11 does not limit the scope of the present disclosure to any particular implementation of the configuration 1100 .
  • An operator's network 1110 includes a number of radio access network(s) 1120 (RAN(s)) that are associated with network devices such as gNBs 1130 a and 1130 b , small cell base stations (femto/pico gNBs or Wi-Fi access points) 1135 a and 1135 b .
  • the network 1110 can support various services, each represented as a slice.
  • an URLL slice 1140 a serves UEs requiring URLL services such as cars 1145 b , trucks 1145 c , smart watches 1145 a , and smart glasses 1145 d .
  • Two mMTC slices 1150 a and 550 b serve UEs requiring mMTC services such as power meters 555 b , and temperature control box 1155 b .
  • One eMBB slice 1160 a serves UEs requiring eMBB services such as cells phones 1165 a , laptops 1165 b , and tablets 1165 c .
  • a device configured with two slices can also be envisioned.
  • a CSI-RS resource refers to a non-zero power (NZP) CSI-RS resource, unless stated otherwise.
  • FIG. 12 illustrates an example antenna port layout 1200 according to embodiments of the present disclosure.
  • the embodiment of the antenna port layout 1200 illustrated in FIG. 12 is for illustration only.
  • FIG. 12 does not limit the scope of the present disclosure to any particular implementation.
  • 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. So, for a dual-polarized antenna port layout, the total number of antenna ports is 2N 1 N 2 .
  • An illustration is shown in FIG. 12 .
  • FIG. 13 illustrates an example 3D grid of DFT beams 1300 according to embodiments of the present disclosure.
  • the embodiment of the 3D grid of DFT beams 1300 illustrated in FIG. 13 is for illustration only.
  • FIG. 13 does not limit the scope of the present disclosure to any particular implementation.
  • 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 frequency dimension in addition to the 1st and 2nd antenna port dimensions.
  • High-resolution (e.g., Type II) CSI reporting in which the linear combination based Type II CSI reporting framework is extended to include frequency dimension in addition to the 1st and 2nd antenna port dimensions.
  • An illustration of the 3D grid of the oversampled DFT beams (1st port dim., 2nd port dim., freq. dim.) is shown in FIG. 13 in which: 1st dimension is associated with the 1st port dimension; 2nd dimension is associated with the 2nd port dimension; and 3rd dimension is associated with the frequency dimension.
  • the basis sets for 1 st and 2 nd port domain representation are oversampled DFT codebooks of length-N 1 and length-N 2 , respectively, and with oversampling factors O 1 and O 2 , respectively.
  • the basis set for frequency domain representation i.e., 3rd dimension
  • the oversampling factors O i belongs to ⁇ 2, 4, 8 ⁇ .
  • at least one of O 1 , O 2 , and O 3 is higher layer configured (via RRC signaling).
  • N 1 is a number of antenna ports in a first antenna port dimension
  • N 2 is a number of antenna ports in a second antenna port dimension
  • N 3 is a number of SBs or frequency domain (FD) units/components for PMI reporting (that comprise the CSI reporting band)
  • a i is a 2N 1 N 2 ⁇ 1 (Eq. 1) or N 1 N 2 ⁇ 1 (Eq. 2) column vector
  • b k is a N 3 ⁇ 1 column vector
  • c l,i,k is a complex coefficient.
  • the reporting of K coefficients is via a bitmap of length 2LM.
  • the precoder equations Equation 1 or Equation 2 are respectively generalized to:
  • M i is the number of coefficients c l,i,m reported by the UE for a given i, where M i ⁇ M (where ⁇ M L ⁇ 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 ] .
  • Equation 2 is assumed in the rest of the present disclosure.
  • the embodiments of the present disclosure are general and are also application to Equation 1, Equation 3, and Equation 4.
  • u m ⁇ [ 1 e j ⁇ 2 ⁇ ⁇ ⁇ ⁇ m O 2 ⁇ N 2 ⁇ e j ⁇ 2 ⁇ ⁇ ⁇ ⁇ m ⁇ ( N 2 - 1 ) O 2 ⁇ N 2 ]
  • N 2 1 ⁇ ⁇ v l
  • m [ u m e j ⁇ 2 ⁇ ⁇ ⁇ ⁇ l O 1 ⁇ N 1 ⁇ u m ⁇ e j ⁇ 2 ⁇ ⁇ ⁇ ⁇ l ⁇ ( N 1 - 1 ) O 1 ⁇ N 1 ⁇ u m ] T .
  • w k [ 1 e j ⁇ 2 ⁇ ⁇ ⁇ ⁇ k O 3 ⁇ N 3 ⁇ e j ⁇ 2 ⁇ ⁇ ⁇ ⁇ k ⁇ ( N 3 - 1 ) O 3 ⁇ N 3 ] T .
  • 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 present disclosure is applicable to any other basis vectors to construct/report A and B.
  • the L antenna ports per polarization or column vectors of A are selected by the index q 1 , where
  • d is configured with the higher layer parameter PortSelectionSamplingSize, where d ⁇ 1,2,3,4 ⁇ and
  • a precoder W l can be described as given by:
  • the present disclosure provides a few example embodiments about quantization and reporting of linear combination coefficients c l,i,m composing the ⁇ tilde over (W) ⁇ 2 matrix.
  • the amplitude coefficient is reported using a A-bit amplitude codebook, and the phase coefficient is reported using P-bit phase codebook.
  • A 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • N PSK alphabet size
  • Alt 1B the amplitude and phase coefficients are reported according to Alt 1A except that N PSK ⁇ 8,16 ⁇ .
  • Alt 1C the amplitude and phase coefficients are reported according to Alt 1A except that N PSK ⁇ 4,8,16 ⁇ .
  • A1 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • A2 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • A2 2 and the amplitude codebook is as shown in TABLE 2.
  • N PSK alphabet size
  • Alt 2B the amplitude and phase coefficients are reported according to Alt 2A except that N PSK ⁇ 8,16 ⁇ .
  • Alt 2C the amplitude and phase coefficients are reported according to Alt 2A except that N PSK ⁇ 4,8,16 ⁇ .
  • A1 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • A2 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • A2 2 and the amplitude codebook is as shown in TABLE 2.
  • N PSK alphabet size
  • Alt 3B the amplitude and phase coefficients are reported according to Alt 3A except that N PSK ⁇ 8,16 ⁇ .
  • Alt 3C the amplitude and phase coefficients are reported according to Alt 3A except that N PSK ⁇ 4, 8,16 ⁇ .
  • a common amplitude coefficient (p l,i,m (1) ) is reported common for all coefficients comprising the g-th coefficient group using an A1-bit amplitude codebook.
  • A1 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • an independent amplitude coefficient (p l,i,m (2) ) is reported for each coefficient comprising the g-th coefficient group using a A2-bit amplitude codebook.
  • A2 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • A2 2 and the amplitude codebook is as shown in TABLE 2.
  • A2 1 and the amplitude codebook is as shown in TABLE 3.
  • a phase coefficient is reported for each coefficient comprising the g-th coefficient group using P-bit phase codebook.
  • N PSK alphabet size
  • Alt 4B the amplitude and phase coefficients are reported according to Alt 4A except that N PSK ⁇ 8,16 ⁇ .
  • Alt 4C the amplitude and phase coefficients are reported according to Alt 4A except that N PSK ⁇ 4,8,16 ⁇ .
  • the G groups are constructed as follows.
  • the 2L spatial domain beams (corresponding to rows of ⁇ tilde over (W) ⁇ 2 ) and M frequency domain beams (corresponding to columns of ⁇ tilde over (W) ⁇ 2 ) are sorted in decreasing order of amplitude/power.
  • Q q 0 , q 1 , . . .
  • averaging is performed separately in both the spatial domain (i.e., across ports or columns of basis matrix W 1 or indices i of and the frequency domain (i.e., across SBs or columns of basis matrix W f or indices k of c l,i,m ).
  • FIG. 14 illustrates an example coefficient groups 1400 according to embodiments of the present disclosure.
  • the embodiment of the coefficient groups 1400 illustrated in FIG. 14 is for illustration only.
  • FIG. 14 does not limit the scope of the present disclosure to any particular implementation.
  • the value ⁇ is either fixed (e.g. to 1) or configured via higher layer signaling or reported by the UE.
  • Alt 5A this alternative is the same as Alt 2A for the WB and SB amplitude reporting.
  • WB phase and SB phase are reported as follows.
  • ⁇ 1.
  • the value of N PSK,1 is configured with the higher layer parameter PhaseAlphabetSize, where N PSK,1 ⁇ 4,8 ⁇ .
  • ⁇ 1.
  • Alt 5B the amplitude and phase coefficients are reported according to Alt 5A except that N PSK,1 ⁇ 8,16 ⁇ .
  • Alt 5C the amplitude and phase coefficients are reported according to Alt 5A except that N PSK,1 ⁇ 4,8,16 ⁇ .
  • Alt 5E the amplitude and phase coefficients are reported according to Alt 5A except that N PSK,2 ⁇ 4,8 ⁇ .
  • Alt 5F the amplitude and phase coefficients are reported according to Alt 5A except that N PSK,2 ⁇ 2,4,8 ⁇ .
  • Alt 6A this alternative is the same as Alt 6A for the common and independent amplitude reporting.
  • common phase and independent phase are reported as follows.
  • ⁇ 1.
  • ⁇ e j ⁇ /4 .
  • ⁇ e j ⁇ /N PSK,1 .
  • the value of N PSK,1 (alphabet size) is configured with the higher layer parameter PhaseAlphabetSize, where N PSK,1 ⁇ 4,8 ⁇ .
  • ⁇ 1.
  • Alt 6B the amplitude and phase coefficients are reported according to Alt 6A except that N PSK,1 ⁇ 8,16 ⁇ .
  • Alt 6C the amplitude and phase coefficients are reported according to Alt 6A except that N PSK,1 ⁇ 4,8,16 ⁇ .
  • Alt 6E the amplitude and phase coefficients are reported according to Alt 6A except that N PSK,2 ⁇ 4,8 ⁇ .
  • Alt 6F the amplitude and phase coefficients are reported according to Alt 6A except that N PSK,2 ⁇ 2,4,8 ⁇ .
  • Alt 7A this alternative is the same as Alt 4A for the common and independent amplitude reporting.
  • common phase and independent phase are reported as follows.
  • a common phase coefficient ( ⁇ l,i,m (1) ) is reported common for all coefficients comprising the g-th coefficient group using a P1-bit phase codebook.
  • ⁇ 1.
  • ⁇ e j ⁇ /4 .
  • ⁇ e j ⁇ /N PSK,1 .
  • the value of N PSK,1 (alphabet size) is configured with the higher layer parameter PhaseAlphabetSize, where N PSK,1 ⁇ 4,8 ⁇ .
  • an independent phase coefficient ( ⁇ l,i,m (2) ) is reported for each coefficient comprising the g-th coefficient group using a P2-bit phase codebook.
  • ⁇ 1.
  • ⁇ e ⁇ j ⁇ /4 .
  • ⁇ e ⁇ j ⁇ /N PSK,2
  • the value of N PSK,2 (alphabet size) is configured with the higher layer parameter PhaseAlphabetSize2, where N PSK,2 ⁇ 2,4 ⁇ .
  • Alt 7B the amplitude and phase coefficients are reported according to Alt 7A except that N PSK,1 ⁇ 8,16 ⁇ .
  • Alt 7C the amplitude and phase coefficients are reported according to Alt 7A except that N PSK,1 ⁇ 4,8,16 ⁇ .
  • Alt 7E the amplitude and phase coefficients are reported according to Alt 7A except that N PSK,2 ⁇ 4, 8 ⁇ .
  • Alt 7F the amplitude and phase coefficients are reported according to Alt 7A except that N PSK,2 ⁇ 2,4,8 ⁇ .
  • the phase reporting is according to Alt 2A in scheme 2.
  • the amplitude reporting is as follows.
  • A11 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • A12 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • an independent amplitude coefficient (p l,i,m (2) ) is reported for each coefficient c l,i,m using a A2-bit amplitude codebook.
  • A2 3 and the amplitude codebook corresponds to the 3-bit amplitude codebook for WB amplitude reporting as shown in TABLE 1.
  • A2 2 and the amplitude codebook is as shown in TABLE 2.
  • A2 1 and the amplitude codebook is as shown in TABLE 3.
  • Alt 8B the phase reporting is according to Alt 2B and amplitude reporting is the same as in Alt 8A.
  • Alt 8C the phase reporting is according to Alt 2C and amplitude reporting is the same as in Alt 8A.
  • Alt 8D the phase reporting is according to Alt 2D and amplitude reporting is the same as in Alt 8A.
  • the amplitude reporting is according to Alt 8A.
  • the phase reporting is as follows.
  • P11 3.
  • P12 3.
  • an independent phase coefficient ( ⁇ l,i,m (2) ) is reported for each coefficient c l,i,m using a P2-bit phase codebook.
  • P2 1 or 2.
  • this alternative is the same as Alt 9A except that the N PSK,1,1 and N PSK,1,2 are configured (via two independent higher layer signaling parameters) where N PSK,1,1 ⁇ 4,8 ⁇ and N PSK,1,2 ⁇ 4,8 ⁇ .
  • this alternative is the same as Alt 9A except that the N PSK,1,1 and N PSK,1,2 are configured (via two independent higher layer signaling parameters) where N PSK,1,1 ⁇ 8,16 ⁇ and N PSK,1,2 ⁇ 8,16 ⁇ .
  • this alternative is the same as Alt 9A except that the N PSK,1,1 and N PSK,1,2 are configured (via two independent higher layer signaling parameters) where N PSK,1,1 ⁇ 4,8,16 ⁇ and N PSK,1,2 ⁇ 4,8,16 ⁇ .
  • N PSK,1,1 and N PSK,1,2 are according to one of Alt 9A-9G, and the N PSK,2 is configured (via a higher layer signaling parameter) where N PSK,2 ⁇ 1,2 ⁇ or ⁇ 2,4 ⁇ or ⁇ 2,4,8 ⁇ .
  • N PSK , 2 N PSK , 1 , 1 2 ⁇ ⁇ or ⁇ ⁇ N PSK , 1 , 1 4 .
  • the reported coefficients (c l,i,m ) are quantized using a bit-size table of size 2L ⁇ M whose (i, m)-th entry corresponds to the number of bits used to quantize coefficient c l,i,m .
  • the bit-size table is only for the amplitude coefficients, and the phase quantization (number of bits or/and phase codebook) is according to at least one of the schemes in the present disclosure.
  • the bit-size table is only for the phase coefficients, and the amplitude quantization (number of bits or/and amplitude codebook) is according to at least one of the schemes in the present disclosure.
  • bit-size table is for both amplitude and phase coefficients either as two separate tables, or as parts of a table or as a pair bit-size pair (b i , b m ) where b i is bit-size for amplitude coefficient and b m is bit-size for phase coefficient.
  • b i bit-size for amplitude coefficient
  • b m bit-size for phase coefficient.
  • B 0 -bit amplitude and C 0 -bit phase codebooks are used for the P 0 strongest coefficients;
  • B 1 -bit amplitude and C 1 -bit phase codebooks are used for the P 1 2 nd strongest coefficients; . . . ;
  • B Q-1 -bit amplitude and C Q-1 -bit phase codebooks are used for the P Q-1 Q th strongest coefficients.
  • the indices of P 0 strongest coefficients, P 1 2 nd strongest coefficients, . . . , P Q-1 Q th strongest coefficients are either reported by the UE (e.g. as part of the CSI report) or fixed or configured by the gNB.
  • B i ⁇ B j for all i ⁇ j. In one example, C i ⁇ C j for all i ⁇ j. In one example, B i ⁇ B j for all i ⁇ j. In one example, C i >C j for all i ⁇ j.
  • Alt 11-0 row-wise grouping
  • the group G 1 comprises coefficients c l,i,m whose index i corresponds to a stronger SD beam and index m ⁇ 0,1, . . . ,M ⁇ 1 ⁇ .
  • the group G 2 comprises coefficients c l,i,m whose index i corresponds to a weaker SD beam and index m ⁇ 0,1, . . . ,M ⁇ 1 ⁇ .
  • the grouping information is indicated as part of CSI report using ⁇ log 2 ( K 2L ) ⁇ bits.
  • the grouping information is not reported explicitly and is derived from the reported SD beam indices.
  • K values are as follows.
  • K is configured, e.g., via higher layer signaling.
  • K is reported by the UE, e.g., as part of the WB CSI report.
  • the grouping is performed across columns.
  • the group G 1 comprises coefficients c l,i,m whose index m corresponds to a stronger FD beam and index i ⁇ 0,1, . . . ,2L ⁇ 1 ⁇ .
  • the group G 2 comprises coefficients c l,i,m whose index m corresponds to a weaker FD beam and index i ⁇ 0,1, . . . ,2L ⁇ 1 ⁇ .
  • the grouping information is indicated as part of CSI report using
  • the grouping information is not reported explicitly and is derived from the reported FD beam indices (or components).
  • Q values are as follows.
  • Q is configured, e.g., via higher layer signaling.
  • Q is reported by the UE, e.g., as part of the WB CSI report.
  • Alt 11-2 both row-wise and column-wise grouping
  • the grouping is performed across both rows and columns.
  • the K and Q values in Alt 11-0 and 11-1 are used to form groups G 1 and G 2 .
  • the group G 1 comprises coefficients c l,i,m whose index i corresponds to a stronger SD beam and index m corresponds to a stronger FD beam and the group G 2 comprises the rest of the coefficients.
  • the group G 1 comprises coefficients c l,i,m whose index i corresponds to a stronger SD beam or index m corresponds to a stronger FD beam and the group G 2 comprises the rest of the coefficients.
  • the details such as how to report the grouping information and the values of K and Q are as explained in Alt 13-0 and Alt 13-1.
  • the strongest coefficient (out of 2LM coefficients) is used for grouping.
  • the index of the strongest coefficient is reported by the UE.
  • C l,i*,m* be the strongest coefficient where (i*, m*) is the index of the strongest coefficient for layer l.
  • At least one of the sub-alternatives is used for grouping.
  • the selection of G 1 and G 2 is free (unrestricted).
  • the group G 1 comprises g 1 ⁇ 2LM coefficients
  • the indices of g 1 coefficients are indicated either via a bitmap of length 2LM or via a combinatorial index indication using
  • bit combinations for amplitude and phase reporting are as follows.
  • the 4-bit amplitude codebook is:
  • the 3-bit amplitude codebook is ⁇ 0, ⁇ square root over (1/x 6 ) ⁇ , ⁇ square root over (1/x 5 ) ⁇ , ⁇ square root over (1/x 4 ) ⁇ , ⁇ square root over (1/x 3 ) ⁇ , ⁇ square root over (1/x 2 ) ⁇ , ⁇ square root over (1/x 1 ) ⁇ , 1 ⁇ .
  • N PSK 2 P 1 (or 2 P 2 ) be the phase alphabet size.
  • a UE is configured to report a size-K 0 subset of coefficients comprising a maximum of K 0 , where K 0 ⁇ 2LM, coefficients.
  • the UE reports the indices of the selected K 0 coefficients as part of the CSI report.
  • the coefficients that are not selected by the UE are set to zero.
  • some of the coefficients can have zero amplitude if zero is included in the amplitude codebook, and hence their phase doesn't need to be reported.
  • the UE can indicate a number non-zero coefficients K 1 ⁇ K 0 (e.g. in UCI part of a two-part UCI to report CSI).
  • the indices of selected coefficients whose amplitudes are zero can be jointly indicated using the subset selection indication K 1 ⁇ K 0 indices that are non-zero. At least one of the following is used to form groups G 1 and G 2 as explained in Scheme 11.
  • the grouping is according to at least one alternative in Scheme 11.
  • the size-K 0 subset or size-K 1 subset selection and the grouping are performed independently, and hence some of the coefficients in either G 1 or G 2 can be zero.
  • the grouping is according to at least one alternative in Scheme 11.
  • the coefficients comprising the stronger group G 1 are included into the size-K 0 subset or size-K 1 subset selection.
  • the CSI report includes the following two components.
  • the first component is the indication of indices of coefficients comprising the stronger group G 1 .
  • Let g 1 be the number of coefficients comprising the stronger group G 1 .
  • the payload (number of bits) of this indication is according to the alternatives in Scheme 11.
  • the size-K 0 subset or size-K 1 subset selection and reporting is performed as explained above. Then, g i out of K 0 (or K 1 ) coefficients are selected freely to form the stronger group. This selection can be via a bitmap of length K 0 (or K 1 or max (K 0 , g 1 ) or max (K 1 , g 1 )) comprising g 1 ones or via a combinatorial index indication using indicating selected
  • the remaining g 2 max(K 1 ⁇ g 1 , 0) or max(K 0 ⁇ g 1 , 0) indices comprising the weaker group G 2 .
  • g 1 in Scheme 11 or 12 or other embodiments of the present disclosure is determined according to at least one of the following alternatives.
  • the value g 1 is configured via higher layer signaling.
  • the value g 1 is reported by the UE as part of the CSI report.
  • the first amplitude component e.g. WB amplitude
  • p l,i,m (1) equals one of p l,i,m (1) reported for the stronger group of coefficients
  • SB amplitude component e.g. SB amplitude
  • amplitude and phase codebooks are as in Scheme 11.
  • the rest of the details (components) are according to Scheme 11.
  • the grouping is according to at least one of alternatives 11-0 to 11-4 (or sub-alternatives therein).
  • the details of size-K0 subset or size-K1 subset selection is applicable in this scheme in a straightforward manner.
  • Alt 11-3-2 is used for grouping (the strongest coefficient (out of 2LM coefficients) is used for grouping)
  • the group G 2 comprises the rest of the coefficients, where m* is s the column index (FD component) of the strongest coefficient C l,i*,m* for layer l that is reported by the UE.
  • m* is s the column index (FD component) of the strongest coefficient C l,i*,m* for layer l that is reported by the UE.
  • the amplitude equals this component amplitude.
  • this common amplitude component is used to obtain a differential amplitude component (A 2 ).
  • the reported coefficients are grouped in two groups, G 1 and G 2 , but the grouping information is not reported explicitly by the UE. Rather, the grouping is performed implicitly based on the first amplitude component (e.g., WB amplitude) p l,i (1) for each SD beam i ⁇ 0,1, . . . ,2L ⁇ 1 ⁇ .
  • the strongest coefficient (out of M coefficients), the one with the maximum amplitude) can be used as reference and its quantized amplitude (using A (1) bits) is used as the first amplitude component (e.g., WB amplitude) p l,i (1) for that SD beam i.
  • the M coefficients of the same SD beam i can then be normalized (divided) by the amplitude of the strongest coefficient, and then quantized using A (2) bits to obtain the second amplitude component p l,i,m (2) for M coefficients.
  • the phase of all coefficients ⁇ l,i,m are quantized using P bits.
  • p l,i (1) a first amplitude component (e.g. WB amplitude) that is reported common (a single value) for all M SD coefficients of a SD beam i
  • p l,i (2) a second amplitude component (e.g. SB amplitude) that is reported for each of M SD coefficients of a SD beam i
  • ⁇ l,i,m a phase value that is reported for a SD beam i and FD beam m.
  • (A (1) , A (2) , P) (A, A ⁇ 1, P), where P ⁇ 2, 3, 4 ⁇ or ⁇ 3, 4 ⁇ is configured, and A ⁇ 2, 3 ⁇ or ⁇ 2, 3, 4 ⁇ is also configured.
  • (A (1) , A (2) , P) (A, A ⁇ 2, P), where P ⁇ 2, 3, 4 ⁇ or ⁇ 3,4 ⁇ is configured, and A ⁇ 2, 3 ⁇ or ⁇ 2, 3, 4 ⁇ is also configured.
  • the reported coefficients are grouped into two groups.
  • a first group G 1 comprises g 1 coefficients.
  • the grouping is based on SD index i. At least of the following alternatives is used for grouping.
  • g 1 is fixed (not reported).
  • the UE reports SD indices comprising the first group G 1 .
  • the UE reports both g 1 and SD indices comprising the stronger group G 1 .
  • the UE reports number of stronger SD beams g 1 , where 0 ⁇ g 1 ⁇ K or 2L.
  • g i is configured.
  • the UE reports SD indices comprising the stronger group G 1 .
  • At least one of the alternatives is used for quantization of the first group.
  • the grouping is based on FD index m. At least of the following alternatives is used for grouping.
  • g 1 is fixed (not reported).
  • the UE reports FD indices comprising the first group G 1 .
  • the UE reports both g 1 and FD indices comprising the stronger group G 1 .
  • the UE reports number of stronger FD beams g 1 , where 0 ⁇ g 1 ⁇ M.
  • g 1 is configured.
  • the UE reports FD indices comprising the stronger group G 1 .
  • At least one of the alternatives is used for quantization of the first group.
  • the grouping is based on both SD index i and FD index m.
  • At least one of alternatives in Scheme 13A and 14B, or their combinations can be used for grouping and quantization.
  • a second group G 2 comprises g 2 coefficients.
  • K NZ out of K 0 ⁇ 2LM be number of non-zero coefficients whose amplitude/phase are reported by the UE. At least one of the alternatives is used for the two amplitude values.
  • the reference amplitude value is indicated (reported) explicitly as part of the CSI report.
  • this reference corresponds to the strongest coefficient out of all (K NZ ) reported coefficients which is indicated as strongest coefficient indicator. At least one of the following examples is used.
  • the amplitude and phase of the strongest coefficient are reported.
  • c l,i,m p l,i,m (1)
  • p l,i,m (2) ⁇ l,i,m i.e., p l,i,m (2) and ⁇ l,i,m
  • p l (1) is as reported for the strongest coefficient.
  • A1 is fixed or configured from 3 or 4.
  • P1 in configured from 3 or 4.
  • A2 is fixed or configured from 2 or 3.
  • P2 in configured from 2 or 3 or 4.
  • the reference amplitude value may or may not correspond to the strongest coefficient out of all reported coefficients, and hence there is no such explicit indication in the CSI report.
  • the reference amplitude value p l (1) is reported using a A1-bit amplitude codebook, and for all K NZ coefficients, p l,i,m (2) and ⁇ l,i,m are reported using A2-bit amplitude codebook and P2-bit phase codebook, respectively.
  • A1 is fixed or configured from 3 or 4.
  • A2 is fixed or configured from 2 or 3.
  • P2 in configured from 2 or 3 or 4.
  • the strongest coefficient (out of K NZ coefficients) is indicated/reported as part of the CSI report. Note that the strongest coefficient equals one, i.e., its amplitude and phase are one, hence, they are not reported.
  • the remaining (K NZ ⁇ 1) coefficients are quantized/reported according to at least one of the following examples.
  • the reference is indicated (reported) explicitly as part of the CSI report.
  • This indication indicates a coefficient out of K NZ ⁇ 1 coefficients which serves as a reference.
  • the amplitude and phase of the reference (in addition to the indicator) are reported.
  • c l,i,m p l,i,m (1)
  • p l,i,m (2) ⁇ l,i,m i.e., p l,i,m (2) and ⁇ l,i,m
  • p l (1) is as reported for the reference coefficient.
  • A1 is fixed or configured from 3 or 4.
  • P1 in configured from 3 or 4.
  • A2 is fixed or configured from 2 or 3.
  • P2 in configured from 2 or 3 or 4.
  • the indication of the strongest coefficient and the reference can be joint (i.e., they are reported together using one indication for both or two separate indications, but they are reported in the same UCI part, e.g., UCI part 2), or separate (two separate indications, which can be in two different UCI parts, e.g. one in UCI part 1 and the other in UCI part 2).
  • the reference is not reported explicitly in the CSI report (as in previous example).
  • the reference amplitude value p l (1) is reported using a A1-bit amplitude codebook, and for all K NZ ⁇ 1 coefficients, p l,i,m (2) and ⁇ l,i,m are reported using A2-bit amplitude codebook and P2-bit phase codebook, respectively.
  • A1 is fixed or configured from 3 or 4.
  • A2 is fixed or configured from 2 or 3.
  • P2 in configured from 2 or 3 or 4.
  • the quantization/reporting of coefficients in each group is according to at least one sub-alternatives or examples in Alt 14-0. In particular, when the strongest coefficient is reported as part of the CSI report and it is also used as reference, then it is used as reference for only one of the two groups. Regarding the two groups, at least one of the following sub-alternatives is used.
  • the rest of the details are the same as in Scheme 13A.
  • the groups are selected freely. That is, the group G 1 comprising g 1 coefficients is selected out all K NZ coefficients freely, and the group G 2 comprising g 2 coefficients corresponds to the remaining K NZ ⁇ g 1 coefficients.
  • the rest of the details are the same as in scheme 15.
  • the quantization/reporting of coefficients in each group is according to at least one sub-alternatives or examples in Alt 14-0. In particular, when the strongest coefficient is reported as part of the CSI report and it is also used as reference, then it is used as reference for only one of the L groups. Regarding the L groups, at least one of the following sub-alternatives is used.
  • the groups are selected freely. That is, the group G 1 comprising g coefficients is selected out all K NZ coefficients freely. The rest of the details are the same as in scheme 15.
  • the reported coefficients are grouped into multiple groups, which are sorted (ordered) based on power (amplitude).
  • the reference amplitude value for a group is obtained from another group which is higher in power (amplitude). For example, the reference amplitude equals the minimum amplitude reported for a group immediately higher in power. At least following alternatives is used.
  • the strongest coefficient (out of K NZ coefficients) is reported explicitly, and it equals one.
  • the differential amplitude p l,i,m (2) and phase ⁇ l,i,m for g 1 coefficients are reported using A2 bit amplitude codebook and P2 bit phase codebook, respectively.
  • A2 is fixed or configured from 2 or 3.
  • P2 is fixed or configured from 2 or 3 or 4.
  • the reference p l,i,m (1) for G 1 is reported explicitly using A1 bit amplitude codebook.
  • A1 is fixed or configured from 3 or 4.
  • the differential amplitude p l,i,m (2) and phase ⁇ l,i,m for g 1 coefficients are reported using A2 bit amplitude codebook and P2 bit phase codebook, respectively.
  • A2 is fixed or configured from 2 or 3.
  • P2 is fixed or configured from 2 or 3 or 4.
  • one out of g 1 coefficients is used as reference, and its index is explicitly indicated.
  • the amplitude p l,i,m (1) and phase ⁇ l,i,m of this reference are reported using A1 bit amplitude codebook and A2 P1 bit phase codebook.
  • A1 is fixed or configured from 3 or 4.
  • P1 is fixed or configured from 3 or 4.
  • the differential amplitude p l,i,m (2) and phase ⁇ l,i,m for remaining g 1 ⁇ 1 coefficients are reported using A2 bit amplitude codebook and P2 bit phase codebook, respectively.
  • A2 is fixed or configured from 2 or 3.
  • P2 is fixed or configured from 2 or 3 or 4.
  • the reference amplitude p l,i,m (1) for these remaining g 1 ⁇ 1 coefficients equal p l,i,m (1) reported for the reference coefficient.
  • A2 is fixed or configured from 2 or 3.
  • P2 is fixed or configured from 2 or 3 or 4.
  • the values g 1 and g 2 are according to at least one of the following alternatives.
  • the differential amplitude p l,i,m (2) is reported common for all g 2 coefficients in G 2 , i.e., a single differential amplitude p l,i,m (2) is reported for all coefficients in G 2 .
  • such differential coefficients represent an average differential amplitude.
  • the values g 1 and g 2 are according to at least one alternative Alt 15-0-3 through Alt 15-0-5.
  • K NZ be the number of reported non-zero (NZ) coefficients (which for example are reported using a bitmap) for layer l. It may denote the LC coefficient associated with SD beam i ⁇ 0,1, . . . ,2L ⁇ 1 ⁇ and FD unit (component) m ⁇ 0,1, . . . ,M ⁇ 1 ⁇ as c l,i,m and let the strongest coefficient (out of the K NZ NZ coefficients) as c l*,m* .
  • the amplitude of the K NZ coefficients is then quantized and reported as p l,i,m (1) p l,i,m (2) , where p l,i,m (1) is a reference or first amplitude value and p l,i,m (2) is a differential or second amplitude value (as explained in Scheme 14). At least one of the following alternatives is used.
  • a reference amplitude p l,i,m (1) is reported, which is common for all NZ coefficients ⁇ c l,i,m ⁇ that have the same antenna polarization p; and a differential amplitude p l,i,m (2) is reported for each NZ coefficient that has the same antenna polarization p.
  • p* For coefficients with polarization p*, a reference amplitude p l,i,m (1) is not reported, and a differential amplitude p l,i,m (2) is reported for each NZ coefficient that has the same antenna polarization p*.
  • a reference amplitude p l,i,m (1) is reported, which is common for all NZ coefficients ⁇ c l,i,m ⁇ that have the same antenna polarization p, and a differential amplitude p l,i,m (2) is reported for each NZ coefficient that has the same antenna polarization p.
  • a reference amplitude p l,i,m (1) p l,i (1) is reported, which is common for all NZ coefficients ⁇ c l,i,m ⁇ have the same SD beam index i, and a differential amplitude p l,i,m (2) is reported for each NZ coefficient that has the same FD beam index i.
  • Alt 16-5 there is a strongest coefficient indicator reported in the UCI which is indicated using ⁇ log 2 K NZ ⁇ bits.
  • p* be the antenna polarization of the strongest coefficient c l*,m* .
  • a reference amplitude p l,i,m (1) is not reported, and a differential amplitude p l,i,m (2) is reported for each NZ coefficient that has the same antenna polarization p*.
  • a reference amplitude is reported, which is common for all NZ coefficients ⁇ c l,i,m ⁇ that have the same antenna polarization p, and a differential amplitude p l,i,m (2) is reported for each NZ coefficient that has the same antenna polarization p.
  • up to 1 reference amplitude and up to K NZ differential amplitudes are reported.
  • the location of the strongest coefficient is explicitly indicated with the ⁇ log 2 K NZ ⁇ -bit indicator, there is no need for including the differential amplitude p l,i*,m* (2) (since the location is known and the value is 1). Therefore, in total, up to 1 reference amplitude and up to (K NZ ⁇ 1) differential amplitudes can be reported.
  • Alt 16-6 there is a strongest coefficient c l*,m* indicator reported in the UCI which is indicated using ⁇ log 2 K NZ ⁇ bits.
  • p* be the antenna polarization of the strongest coefficient c l*,m* .
  • a reference amplitude p l,i,m (1) is reported, which is common for all NZ coefficients ⁇ c l,i,m ⁇ that have the same antenna polarization p; and a differential amplitude p l,i,m (2) is reported for each NZ coefficient (not equal to the strongest coefficient) that has the same antenna polarization p.)
  • a reference amplitude p l,i,m (1) is reported, which is common for all NZ coefficients ⁇ c l,i,m ⁇ that have the same antenna polarization p, and a differential amplitude p l,i,m (2) is reported for each NZ coefficient that has the same antenna polarization p.
  • up to 2 reference amplitudes and up to K NZ differential amplitudes are reported.
  • the location of the strongest coefficient is explicitly indicated with the ⁇ log 2 K NZ ⁇ -bit indicator, there is no need for including the differential amplitude p l,i*,m* (2) (since the location is known and the value is 1). Therefore, in total, up to 2 reference amplitudes and up to (K NZ ⁇ 1) differential amplitudes can be reported.
  • this alternative is the same as Alt 16-5 except that the reference amplitude is amplitude of a reference NZ coefficient (c l,i,m ) where the location (i, m) of c l,i,m is determined according to at least one of the following alternatives.
  • the location m) is reported by the UE using ⁇ log 2 K NZ,p ⁇ bits where K NZ,p equals number of NZ coefficients (reported via bitmap) with the same antenna polarization p.
  • the differential amplitude of the reference NZ coefficient is not reported. In total, up to 1 reference amplitude and up to K NZ ⁇ 1 differential amplitudes are reported. Optionally, since the location of the strongest coefficient is explicitly indicated with the ⁇ log 2 K NZ ⁇ bit indicator, there is no need for including the differential amplitude p l,i*,m* (2) (since the location is known and the value is 1). Therefore, in total, up to 1 reference amplitude and up to (K NZ ⁇ 2) differential amplitudes can be reported.
  • this alternative is the same as Alt 16-6 except that the reference amplitude for polarization p* is amplitude of a reference NZ coefficient (c l,i,m ), which is not the strongest coefficient, and the reference amplitude for other polarization p′ ⁇ p* is amplitude of a reference NZ coefficient (c l,i′,m′ ) where the location (i, m) of c l,i,m and the location (i′, m′) of c l,i′,m′ are according to at least one of the following alternatives.
  • the index i is either fixed (e.g. i ⁇ i* that is SD index of maximum number of NZ coefficients, where information about maximum number of NZ coefficients can be obtained from the bitmap indicating the location of NZ coefficients) or is indicated (reported) by the UE using ⁇ log 2 (L ⁇ 1) ⁇ bits.
  • the location (i, m) and (i′, m′) are reported by the UE using ⁇ log 2 K NZ,p* ⁇ and ⁇ log 2 K NZ,p′ ⁇ bits, respectively where K NZ,p equals number of NZ coefficients (reported via bitmap) with the same antenna polarization p.
  • the differential amplitude of the two reference NZ coefficients is not reported. In total, up to 2 reference amplitudes and up to K NZ ⁇ 2 differential amplitudes are reported. Optionally, since the location of the strongest coefficient is explicitly indicated with the ⁇ log 2 K NZ ⁇ -bit indicator, there is no need for including the differential amplitude p l,i*,m* (2) since the location is known and the value is 1). Therefore, in total, up to 2 reference amplitudes and up to (K NZ ⁇ 3) differential amplitudes can be reported.
  • this alternative is the same as Alt 16-3 except that for polarization p ⁇ p*, the reference amplitude is amplitude of a reference NZ coefficient (c l,i,m ) where the location (i, m) of c l,i,m is determined according to at least one of the following alternatives.
  • the location (i, m) is reported by the UE, for example, by using ⁇ log 2 K NZ,p ⁇ bits indication where K NZ,p equals number of NZ coefficients (reported via bitmap) with the same antenna polarization p.
  • the location (i, m) is not reported by the UE explicitly, but is derived based on other CSI component reported by the UE, for example, based on the bitmap reported by the UE to indicate the location of NZ coefficients.
  • the index i is not reported by the UE explicitly, but is derived based on other CSI component reported by the UE, for example, based on the bitmap reported by the UE to indicate the location of NZ coefficients, and the index m is reported by the UE, for example, by using ⁇ log 2 M ⁇ bits indication.
  • the index m is not reported by the UE explicitly, but is derived based on other CSI component reported by the UE, for example, based on the bitmap reported by the UE to indicate the location of NZ coefficients, and the index i is reported by the UE, for example, by using ⁇ log 2 2L ⁇ bits indication.
  • the differential amplitude of the reference NZ coefficient is not reported. In total, up to 1 reference amplitude and up to K NZ ⁇ 1 differential amplitudes are reported.
  • this alternative is the same as Alt 16-1 except that for the two polarizations p and p′, the reference amplitudes are amplitudes of reference NZ coefficients c l,i,m and c l,i′,m′ , where the location (i, m) of c l,i,m and (i′, m′) of c l,i′,m′ are determined according to at least one of the following alternatives.
  • the locations (i, m) and (i′, m′) are reported by the UE, for example, by using ⁇ log 2 K NZ,p ⁇ and ⁇ log 2 K NZ,p′ ⁇ bits, respectively where K NZ,p equals number of NZ coefficients (reported via bitmap) with the same antenna polarization p.
  • the locations (i, m) and (i′, m′) are not reported and are derived based on the bitmap indicating location of NZ coefficients.
  • differential amplitudes of the two reference NZ coefficients are not reported. In total, up to 2 reference amplitudes and up to K NZ ⁇ 2 differential amplitudes are reported.
  • B D1 ⁇ B D2 1.
  • (B D1 ,B D2 ) (4,3).
  • one of the reference amplitudes corresponds to the amplitude
  • the coefficient with known index (l*, m*) (e.g. the strongest coefficient) is assumed to be one (hence its amplitude and phase are not reported)
  • reference amplitudes are quantized using B R bits, and differential amplitudes are quantized using to B D bits. Then at least one of the following alternatives is used.
  • the phase of the K NZ coefficients is quantized and reported according to some alternatives in scheme 13 through 15. Also, for Alt 16-0, Alt 16-1, Alt 16-2, or, Alt 16-3, up to K NZ phase values are reported. For Alt 16-4 through Alt 16-8, since the location is the strongest coefficient is explicitly indicated with the ⁇ log 2 K NZ ⁇ -bit indicator, there is no need for including the phase ⁇ l,i*,m* (since the location is known and the value is 1). Therefore, in total, up to K NZ ⁇ 1 phase values are reported.
  • X if multiple quantization schemes (as provided in the present disclosure) can be used for quantization, then one of them is used for quantization according to at least one of the following alternatives.
  • one of the multiple quantization schemes is used based on a condition or rule.
  • the condition (rule) can be based on at least one of parameters L, M, or K 0 .
  • one of the multiple quantization schemes is configured to the UE, e.g., via higher layer RRC signalling.
  • Alt X-2 one of the multiple quantization schemes is reported (recommended) by the UE.
  • an A-bit amplitude codebook (used to quantized amplitude or reference amplitude or differential amplitude of coefficients c l,i,m ) is according to at least one of the alternatives.
  • the A-bit amplitude codebook comprises 2 A amplitude values, where all values are greater than zero.
  • the A-bit amplitude codebook comprises 2 A amplitude values, where 2 A ⁇ 1 values are greater than zero and the one value equals zero.
  • the A-bit amplitude codebook comprises 2 A +1 amplitude values, where 2 A values are greater than zero and the one value equals zero.
  • a UE is configured to report a maximum of K 0 number of coefficients, where K 0 ⁇ 2LM, then the reports the indices of the K 0 coefficients out of a total 2LM coefficients (that comprise coefficient matrix C l ).
  • such an indication can be via a bitmap, where for example, the length of the bitmap can be 2LM. If a bit of the bitmap is one, then corresponding coefficient is reported by the UE, and if a bit of the bitmap is zero, then corresponding coefficient is not reported by the UE (the corresponding coefficient is assumed to be zero).
  • S be a set of K 0 coefficients which can be quantized/reported by the UE.
  • the UE uses an amplitude codebook as in Alt Y-1 or Alt Y-2 (which includes zero as a candidate value) to quantize amplitudes of K 0 coefficients in the set S, and if an amplitude of a coefficient (x) in the set S is quantized to the candidate value zero, then the UE reports that coefficient (x) according to one of the following alternatives.
  • the UE doesn't report (amplitude or phase) of the coefficient (x), and sets the corresponding bit in the bitmap to zero to indicate that the coefficient (x) is quantized to zero indicating that amplitude/phase of coefficients (x) is not reported. Note that the number of ones (indicating number of reported non-zero coefficients) in the bitmap can be less than K 0 .
  • the UE report a zero amplitude for the coefficient (x), and keeps the corresponding bit in the bitmap to one to indicate that the coefficient (x) is quantized/reported.
  • the phase of the coefficients (x) may or may not be reported. Note that the number of ones (indicating number of reported zero or non-zero coefficients) in the bitmap equals K 0 .
  • the UE uses an amplitude codebook as in Alt Y-0 (which does not include zero as a candidate value) to quantize amplitudes of K 0 coefficients in the set S, and if an amplitude of a coefficient (x) in the set S is below (less than, or less or equal to) a certain threshold value (y), then the UE reports that coefficient (x) according to one of the alternatives, Alt Y-A and Alt Y-B.
  • the threshold value y
  • the amplitude codebook C Amp is at least one of the following.
  • Alt Y-0 is used as amplitude codebook
  • Alt Y-1 is used as amplitude codebook
  • Alt Y-2 is used as amplitude codebook
  • the amplitude codebook C Amp is at least one of the following.
  • Alt Y-0 is used as amplitude codebook
  • Alt Y-1 is used as amplitude codebook
  • Alt Y-2 is used as amplitude codebook
  • the amplitude codebook C Amp is at least one of the following.
  • Alt Y-0 is used as amplitude codebook
  • Alt Y-1 is used as amplitude codebook
  • Alt Y-2 is used as amplitude codebook
  • the amplitude codebook C Amp is at least one of the following.
  • Alt Y-0 is used as amplitude codebook
  • Alt Y-2 is used as amplitude codebook
  • the amplitude coefficient (p l,i,m ) is reported using a A-bit amplitude codebook where A belongs to ⁇ 2, 3, 4 ⁇ .
  • amplitude codebooks are provided to report amplitude coefficient (p l,i,m ) for the coefficients in ⁇ tilde over (W) ⁇ 2 that are reported by the UE.
  • the coefficients that are not reported by the UE are assumed to be zero.
  • the following embodiments/alternatives/examples are applicable for both the A-bit amplitude codebook and the A1-bit or A2-bit amplitude codebook.
  • A-bit amplitude codebook is provided.
  • an A-bit amplitude codebook (used to quantized amplitude of coefficients c l,i,m ) is according to at least one of the alternatives.
  • the A-bit amplitude codebook comprises 2 A amplitude values, where all values are greater than zero.
  • the A-bit amplitude codebook comprises 2 A amplitude values, where 2 A ⁇ 1 values are greater than zero and the one value equals zero.
  • the A-bit amplitude codebook comprises 2 A +1 amplitude values, where 2 A values are greater than zero and the one value equals zero.
  • a UE is configured to report a maximum of K 0 number of coefficients, where K 0 ⁇ 2LM, then the reports the indices of the K 0 coefficients out of a total 2LM coefficients (that comprise coefficient matrix C l ).
  • such an indication can be via a bitmap, where for example, the length of the bitmap can be 2LM. If a bit of the bitmap is one, then corresponding coefficient is reported by the UE, and if a bit of the bitmap is zero, then corresponding coefficient is not reported by the UE (the corresponding coefficient is assumed to be zero).
  • S be a set of K 0 coefficients which can be quantized/reported by the UE.
  • the UE uses an amplitude codebook as in Alt YY-1 or Alt YY-2 (which includes zero as a candidate value) to quantize amplitudes of K 0 coefficients in the set S, and if an amplitude of a coefficient (x) in the set S is quantized to the candidate value zero, then the UE reports that coefficient (x) according to one of the following alternatives.
  • the UE doesn't report (amplitude or phase) of the coefficient (x), and sets the corresponding bit in the bitmap to zero to indicate that the coefficient (x) is quantized to zero indicating that amplitude/phase of coefficients (x) is not reported. Note that the number of ones (indicating number of reported non-zero coefficients) in the bitmap can be less than K 0 .
  • the UE report a zero amplitude for the coefficient (x), and keeps the corresponding bit in the bitmap to one to indicate that the coefficient (x) is quantized/reported.
  • the phase of the coefficients (x) may or may not be reported. Note that the number of ones (indicating number of reported zero or non-zero coefficients) in the bitmap equals K 0 .
  • the UE uses an amplitude codebook as in Alt YY-0 (which does not include zero as a candidate value) to quantize amplitudes of K 0 coefficients in the set S, and if an amplitude of a coefficient (x) in the set S is below (less than, or less or equal to) a certain threshold value (y), then the UE reports that coefficient (x) according to one of the alternatives, Alt YY-A and Alt YY-B.
  • the threshold value y
  • an A-bit (A1 or A2) amplitude codebook (used to quantized amplitude of coefficients c l,i,m ) comprises 2 A or 2 A +1 amplitude values whose non-zero (NZ) values have uniform spacing in dB domain, i.e., the difference between any two consecutive NZ amplitude values is constant in dB.
  • the amplitude codebook C Amp is at least one of the following.
  • Alt YY-0 is used as amplitude codebook
  • Alt YY-1 is used as amplitude codebook
  • Alt YY-2 is used as amplitude codebook
  • Alt YY-0 is used as amplitude codebook
  • D is chosen to ensure a fixed dynamic range (in dB).
  • D 18 then x ⁇ 1.3183 or 1.32.
  • D 21 then x ⁇ 1.3804 or 1.38.
  • Alt YY-1 is used as amplitude codebook
  • D is chosen to ensure a fixed dynamic range (in dB).
  • D 18 then x ⁇ 1.3183 or 1.32.
  • D 21 then x ⁇ 1.3804 or 1.38.
  • Alt YY-2 is used as amplitude codebook
  • D is chosen to ensure a fixed dynamic range (in dB).
  • D 18 then x ⁇ 1.3183 or 1.32.
  • D 21 then x ⁇ 1.3804 or 1.38.
  • the amplitude codebook C Amp is at least one of the following.
  • Alt YY-0 is used as amplitude codebook
  • Alt YY-1 is used as amplitude codebook
  • Alt YY-2 is used as amplitude codebook
  • Alt YY-0 is used as amplitude codebook
  • D is chosen to ensure a fixed dynamic range (in dB).
  • D 18 then x ⁇ 1.8078 or 1.81.
  • D 21 then x ⁇ 1.9953 or 2.
  • Alt YY-1 is used as amplitude codebook
  • D is chosen to ensure a fixed dynamic range (in dB).
  • D 18 then x ⁇ 1.8078 or 1.81.
  • D 21 then x ⁇ 1.9953 or 2.
  • Alt YY-2 is used as amplitude codebook
  • D is chosen to ensure a fixed dynamic range (in dB).
  • D 18 then x ⁇ 1.8078 or 1.81.
  • D 21 then x ⁇ 1.9953 or 2.
  • the amplitude codebook C Amp is at least one of the following.
  • Alt YY-0 is used as amplitude codebook
  • Alt YY-1 is used as amplitude codebook
  • Alt YY-2 is used as amplitude codebook
  • Alt YY-0 is used as amplitude codebook
  • D is chosen to ensure a fixed dynamic range (in dB).
  • D 18 then x ⁇ 3.9811 or 4.
  • Alt YY-1 is used as amplitude codebook
  • D is chosen to ensure a fixed dynamic range (in dB).
  • D 18 then x ⁇ 3.9811 or 4.
  • Alt YY-2 is used as amplitude codebook
  • D is chosen to ensure a fixed dynamic range (in dB).
  • D 18 then x ⁇ 3.9811 or 4.
  • the amplitude codebook C Amp is at least one of the following.
  • Alt YY-0 is used as amplitude codebook
  • Alt YY-2 is used as amplitude codebook
  • an A-bit (A1 or A2) amplitude codebook (used to quantized amplitude of coefficients c l,i,m ) comprises 2 A or 2 A +1 amplitude values whose non-zero (NZ) values have non-uniform spacing in dB domain, i.e., the difference between any two consecutive NZ amplitude values is not constant in dB.
  • the difference between any two consecutive NZ amplitude values is either one of the two x or x 0 in dB.
  • the amplitude codebook C Amp is at least one of the following.
  • the amplitude codebook C Amp is at least one of the following.
  • the amplitude codebook C Amp is at least one of the following.
  • the amplitude codebook C Amp is at least one of the following.
  • R indicates a ‘reserved’ state
  • the reserved state is according to at least one of the following alternatives.
  • Alt Y1C-0 the UE is not expected to use this state for amplitude reporting.
  • the reserved state can be turned ON by higher layer signaling.
  • the UE can use this state for amplitude reporting and the amplitude value that this state indicates belongs to
  • the reserved state can be turned ON depending on UE capability signaling. For example, the UE reports via capability signaling, whether it can support amplitude reporting for this reserved state. When the UE is capable to do so, the UE can use this state for amplitude reporting and the amplitude value that this state indicates belongs to
  • an A-bit (A1 or A2) amplitude codebook (used to quantized amplitude of coefficients c l,i,m ) comprises 2 A or 2 A +1 amplitude values whose non-zero (NZ) values have non-uniform spacing in dB domain, i.e., the difference between any two consecutive NZ amplitude values is not constant in dB. In particular, the difference between any two consecutive NZ amplitude values is not the same.
  • each PMI value corresponds to the codebook indices i 1 and i 2 .
  • N 1 and N 2 are configured with the higher layer parameter n1-n2-codebookSubsetRestriction.
  • the number of CSI-RS ports is given by P CSI-RS ⁇ 4, 8, 12, 16, 24, 32 ⁇ as configured by higher layer parameter nrofPorts.
  • the value of L is configured with the higher layer parameter numberOfBeams.
  • the second PMI The second PMI
  • SB phase coefficient c l,i indicated using indicators i 2,1,1 and i 2,1,2 ; and SB amplitude coefficient p l,i (2) (which can be turned ON or OFF by RRC signaling via subbandAmplitude) indicated using indicators i 2,2,1 and i 2,2,2 .
  • the first PMI is reported in a wideband (WB) manner and the second PMI can be reported in a wideband or subband (SB) manner.
  • WB wideband
  • SB subband
  • FIG. 15 illustrates an example two-part UCI multiplexing 1500 according to embodiments of the present disclosure.
  • the embodiment of the two-part UCI multiplexing 1500 illustrated in FIG. 15 is for illustration only.
  • FIG. 15 does not limit the scope of the present disclosure to any particular implementation.
  • the part 1 UCI may also include CRI if the UE is configured with more than one CSI-RS resources.
  • CQI reported in part 1 UCI corresponds to WB CQI
  • cqi-Formatlndicator subbandCQI
  • CQI reported in part 1 UCI corresponds to WB CQI and SB differential CQI, where WB CQI is reported common for all SBs, and SB differential CQI is reported for each SB, and the number of SBs (or the set of SB indices) is configured to the UE.
  • the CSI reporting payload (bits) for part 2 is determined.
  • the components of the second PMI i 2 are reported only for the coefficients whose corresponding reported WB amplitudes are non-zero.
  • ⁇ l , i , f e j ⁇ 2 ⁇ ⁇ ⁇ ⁇ c l , i , f 16
  • Each PMI value corresponds to the codebook indices i 1 and i 2 where
  • i 1,1 are the rotation factors for the SD basis
  • i 1,2 is the SD basis indicator
  • i 1,5 is the M initial indicator
  • i 1,6,l is the FD basis indicator for layer l
  • i 1,7,l is the bitmap for layer l
  • i 1,8,l is the Strongest coefficient indicator (SCI) for layer l
  • i 2,3,l are the reference amplitudes (p l,0 (1) ) for layer l
  • i 2,4,l is the matrix of the diff.
  • i 2,5,l is the matrix of the phase values ( ⁇ l,i,f ) for layer l.
  • ⁇ t,l is the normalisation factor for the t-th column of W l , which normalizes it to norm one.
  • p l,i,m (1) p l,r (1) is a reference or first amplitude value
  • p l,i,m (2) is a differential or second amplitude value (as explained in Scheme 14 and 16).
  • the strongest coefficient c l,i* i ,m* i is reported in the UCI via the strongest coefficient indicator (SCI).
  • SCI indicates an index (i* i ,m* i ) of the strongest NZ coefficient which equals 1.
  • r* be the antenna polarization of the strongest coefficient c l,i* i ,m* i , i.e.,
  • the amplitude coefficient indicators i 2,3,l and i 2,4,l for the reference and differential amplitudes, respectively, are:
  • i 2,3,l [ k l,0 (1) k l,1 (1) ]
  • i 2,4,l [ k l,0 (2) . . . k l,M-1 (2) ]
  • k l,m (2) [ k l,0,m (2) . . . k l,2L-1,m (2) ]
  • phase coefficient indicator i 2,5,l is:
  • i 2,5,l [ X l,0 . . . x l,M-1 ]
  • i l,m [ X l,0,m . . . x l,2L-1,m ]
  • i 1,7,l [ k l,0 (3) . . . k l,M-1 (3) ]
  • k l,m (3) [ k l,0,m (3) . . . k l,2L-1,m (3) ]
  • p l (2) [ p l,0 (2) . . . p l,M-1 (2) ]
  • p l,m (2) [ p l,0,m (2) . . . p l,2L-1,m (2) ]
  • ⁇ l , i , m e j ⁇ 2 ⁇ ⁇ ⁇ ⁇ x l , i , m 16 .
  • the amplitude and phase coefficient indicators are reported as follows. In one example, for the strongest coefficient
  • r ⁇ 2 ⁇ L - 1 - i l * L ⁇ ⁇ r * .
  • the K NZ ⁇ v indicators x l,i,m for which i ⁇ i* l , m ⁇ m* l (indicating a coefficient c l,i,m other than the strongest coefficient) and k l,i,m (3) 1 (indicating that a coefficient is non-zero) are reported.
  • N 0,1 takes a value from ⁇ 0,1, . . . ,2LM ⁇ 1 ⁇ , where the strongest coefficient (per layer) is included in N 0,1 .
  • Alt B N 0,1 takes a value from ⁇ 0,1, . . . ,2LM ⁇ 2 ⁇ , where since the strongest coefficient (indicated by i 1,3 ) can't be zero, it is excluded in reporting N 0,1 and hence the range of values for N 0,1 can be reduced by 1.
  • N 0,1 and N 0,2 takes a value from ⁇ 0,1, . . . ,2LM ⁇ 1 ⁇ , where the strongest coefficient (per layer) is included in N 0,1 and N 0,2 .
  • Alt BA N 0,1 and N 0,2 takes a value from ⁇ 0,1, . . . ,2LM ⁇ 2 ⁇ , where since the strongest coefficient (indicated by i 1,3 ) can't be zero, it is excluded in reporting N 0,1 and N 0,2 and hence the range of values for N 0,1 and N 0,2 can be reduced by 1.
  • N 0,1 . . . N 0,R takes a value from ⁇ 0,1, . . . ,2LM ⁇ 1 ⁇ , where the strongest coefficient (per layer) is included in N 0,1 . . . N 0,R .
  • N 0,1 . . . N 0,R takes a value from ⁇ 0,1, . . .
  • the maximum number of NZ coefficients is fixed, i.e., K 0 ⁇ 2LM, and the number of candidate values for N 0,1 reporting depends on the value of K 0 .
  • N 0,1 takes a value from ⁇ 0,1, . . . , K 0 ⁇ 1 ⁇ , where the strongest coefficient (per layer) is included in N 0,1 .
  • Alt BA N 0,1 takes a value from ⁇ 0,1, . . . , K 0 ⁇ 2 ⁇ , where since the strongest coefficient (indicated by i 1,3 ) can't be zero, it is excluded in reporting N 0,1 and hence the range of values for N 0,1 can be reduced by 1.
  • N 0,1 and N 0,2 takes a value from ⁇ 0,1, . . . , K 0 ⁇ 1 ⁇ , where the strongest coefficient (per layer) is included in N 0,1 and N 0,2 .
  • Alt BA N 0,1 and N 0,2 takes a value from ⁇ 0,1, . . . , K 0 ⁇ 2 ⁇ , where since the strongest coefficient (indicated by i 1,3 ) can't be zero, it is excluded in reporting N 0,1 and N 0,2 and hence the range of values for N 0,1 and N 0,2 can be reduced by 1.
  • N 0,1 . . . N 0,R takes a value from ⁇ 0,1, . . . , K 0 ⁇ 1 ⁇ , where the strongest coefficient (per layer) is included in N 0,1 . . . N 0,R .
  • N 0,1 . . . N 0,R takes a value from ⁇ 0,1, . . .
  • the maximum number of coefficients (K 0 ) is configured (e.g. via higher layer RRC signaling).
  • a maximum number of coefficients (K 0 ) is used independently for each layer l.
  • the number of NZ coefficients (N 0,l ) is partitioned into two parts, a first part and a second part, where the indices of the first part of NZ coefficients are fixed (hence not reported), and the indices of the second part of NZ coefficients are dynamically selected by the UE (hence they are reported).
  • N 0,l,1 and N 0,l,2 be the number of NZ coefficients comprising the first part and the second part, respectively. Then, they are determined according to at least one of the following alternatives.
  • FIG. 16 illustrates another example two-part UCI multiplexing 1600 according to embodiments of the present disclosure.
  • the embodiment of the two-part UCI multiplexing 1600 illustrated in FIG. 16 is for illustration only.
  • FIG. 16 does not limit the scope of the present disclosure to any particular implementation.
  • two-part UCI multiplexing is used wherein: CQI, RI, LI, and (N 0,1 , . . . ,N 0,v ) are multiplexed and encoded together in UCI part 1; and remaining CSI are multiplexed and encoded together in UCI part 2, where the remaining CSI includes the first PMI i 1 and the second PMI (i 2 ).
  • the part 1 UCI may also include CRI if the UE is configured with more than one CSI-RS resources.
  • CQI reported in part 1 UCI corresponds to WB CQI
  • cqi-Formatlndicator subbandCQI
  • CQI reported in part 1 UCI corresponds to WB CQI and SB differential CQI, where WB CQI is reported common for all SBs, and SB differential CQI is reported for each SB, and the number of SBs (or the set of SB indices) is configured to the UE.
  • the CSI reporting payload (bits) for part 2 is determined.
  • the components of the second PMI i 2 are reported only for the coefficients that are non-zero.
  • the indices of NZ coefficients are reported either explicitly using a bitmap of length 2LM or a combinatorial index
  • indices i 1,3 and i 1,4 can be expressed further as
  • the first PMI is reported in a wideband (WB) manner and the second PMI can be reported in a wideband or subband (SB) manner.
  • WB wideband
  • SB subband
  • FIG. 17 illustrates a flowchart of a method 1700 for CSI reporting according to embodiments of the present disclosure, as may be performed by a user equipment (e.g., 111 - 116 as illustrated in FIG. 1 ).
  • the embodiment of the method 1700 illustrated in FIG. 17 is for illustration only. FIG. 17 does not limit the scope of the present disclosure to any particular implementation.
  • the method 1700 begins at step 1705 .
  • a UE receives, from a base station (BS), CSI feedback configuration information.
  • BS base station
  • the UE derives, based on the CSI feedback configuration information, the CSI feedback including a precoding matrix indicator (PMI).
  • PMI precoding matrix indicator
  • step 1715 the UE transmits, to the BS via an uplink channel, the CSI feedback including the PMI.
  • the total of 2LM v coefficients forms a 2L ⁇ M v coefficient matrix C l comprising 2L rows and M v columns;
  • the group G 0 comprises all coefficients c l,i,m with an index i ⁇ 0,1, . . . ,L ⁇ 1 ⁇ ;
  • the group G 1 comprises all coefficients c l,i,m with an index i ⁇ L, L+1, . . . ,2L ⁇ 1 ⁇ ;
  • the PMI includes amplitude coefficient indicators i 2,3,l and i 2,4,l for first amplitude coefficients and second amplitude coefficients, respectively, given by:
  • i 2,3,l [ k l,0 (1) k l,1 (1) ],
  • i 2,4,l [ k l,0 (2) . . . k l,M-1 (2) ],
  • k l,m (2) [ k l,0,m (2) . . . k l,2L-1,m (2) ],
  • first amplitude coefficients and the second amplitude coefficients are represented by:
  • p l (2) [ p l,0 (2) . . . p l,M-1 (2) ], and
  • p l,m (2) [ p l,0,m (2) . . . p l,2L-1,m (2) ],
  • the UE transmits, to the BS, the CSI feedback including the PMI that includes the determined strongest coefficient indicator i 1,8,l .
  • the UE determines another group G r , where r ⁇ r* and determines a first amplitude coefficient indicator k l,r (1) indicating p l,r (1) for the other group G r .
  • the UE transmits, to the BS, the CSI feedback including the PMI that includes i 2,3,l indicating the first amplitude coefficient indicator for the other group.
  • SD spatial domain
  • FD frequency domain
  • a precoding matrix for each FD unit of a total number (N 3 ) of FD units is determined by columns of

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US16/683,070 US20200162142A1 (en) 2018-11-15 2019-11-13 Method and apparatus to enable csi reporting in wireless communication systems
KR1020217014660A KR102534939B1 (ko) 2018-11-15 2019-11-15 무선 통신 시스템에서 csi 보고를 가능하게 하는 방법 및 장치
CN201980075552.XA CN113039728A (zh) 2018-11-15 2019-11-15 无线通信系统中实现csi报告的方法和装置
JP2021527056A JP7214297B2 (ja) 2018-11-15 2019-11-15 無線通信システムでｃｓｉ報告を可能にする方法及び装置
PCT/KR2019/015712 WO2020101454A1 (en) 2018-11-15 2019-11-15 Method and apparatus to enable csi reporting in wireless communication systems
EP19884443.3A EP3864767A4 (en) 2018-11-15 2019-11-15 METHOD AND APPARATUS FOR TAKING A CSI REPORT IN A WIRELESS COMMUNICATION SYSTEM
US17/304,360 US11381295B2 (en) 2018-11-15 2021-06-18 Method and apparatus to enable CSI reporting in wireless communication systems

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US20220239362A1 (en) * 2019-06-14 2022-07-28 Nec Corporation Method, device and computer readable medium for uplink control information transmission
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WO2023184147A1 (en) * 2022-03-29 2023-10-05 Qualcomm Incorporated Selection and quantization of time domain coefficients through an extended etype-ii codebook
CN115664477A (zh) * 2022-10-20 2023-01-31 中国人民解放军国防科技大学 基于KL变换和Lloyd-Max量化的多天线信道压缩反馈方法

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