Method and apparatus for CSI reporting in multi-TRP scene in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. An apparatus and method for channel state information (CSI) reporting in multiple transmit receive point (TRP) operation in a wireless network. A method performed by a user equipment (UE) includes receiving information about a CSI report. The information indicates Ntrp CSI (Channel State Information) reference signal (CSI-RS) resources, and N < trpgt >; 1. The method further comprises, based on the information, measuring Ntrp CSI-RS resources and determining a CSI report associated with N < = Ntrp CSI-RS resources, where N belongs to {1, 2,..., Ntrp}. The CSI report includes a strongest coefficient indicator (SCI) (SCIl) for each layer l. And the SCIl indicates the index of the strongest coefficient in the # imgabs0 # coefficients. 1 belongs to {1,..., v} is a layer index, v > = 1 is a rank value, and # imgabs1 # is the total number of non-zero coefficients of layer l associated with CSI-RS ports corresponding to N CSI-RS resources. The method also includes transmitting a CSI report.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system (or mobile communication system). More specifically, the present disclosure relates to an electronic device and method for reporting channel state information (CSI) in a multiple transmission reception point (TRP) operation in a wireless network (or mobile communication system). Background Art

[0002] 5G mobile communication technology defines a wide frequency band, making high transmission rates and new services possible, and can be implemented not only in "below 6 GHz" frequency bands such as 3.5 GHz, but also in "above 6 GHz" frequency bands called mmWave including 28 GHz and 39 GHz. In addition, it has been considered to implement 6G mobile communication technology (called super 5G system) in terahertz (THz) frequency bands (e.g., 95 GHz to 3 THz frequency bands) in order to achieve a transmission rate fifty times faster than 5G mobile communication technology and an ultra-low latency one-tenth of 5G mobile communication technology.

[0003] At the beginning of the development of 5G mobile communication technology, in order to support services and meet performance requirements related to enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC) and massive machine type communications (mMTC), there has been ongoing standardization on beamforming and massive MIMO for mitigating radio wave path loss and increasing radio wave transmission distance in mmWave, parameter sets (numerologies) to support dynamic operation for efficient utilization of mmWave resources and time slot formats (e.g., operating multiple subcarrier spacings), initial access technologies for supporting multi-beam transmission and broadband, definition and operation of BWP (bandwidth part) new channel coding methods such as LDPC (low-density parity check) codes for large amounts of data transmission and polar codes for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing dedicated networks dedicated to specific services.

[0004] Currently, in view of the services that 5G mobile communication technology is to support, there are ongoing discussions on improvements and performance enhancements of initial 5G mobile communication technology, and there has been physical layer standardization on technologies such as V2X (Vehicle to Everything) for assisting driving determination of autonomous vehicles based on information on the location and status of the vehicle sent by the vehicle, and for enhancing user convenience, NR-U (New Radio Unlicensed) for system operation that complies with various regulatory-related requirements in unlicensed bands, NR UE power saving, UE-satellite direct communication as a non-terrestrial network (NTN) for providing coverage in areas where communication with terrestrial networks is unavailable, and positioning.

[0005] In addition, there has been ongoing standardization on air interface architecture / protocols for technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner, mobility enhancements including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access (NR's two-step RACH) for simplifying the random access procedure. There is also ongoing standardization on system architecture / services for 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software-defined networking (SDN) technologies, and mobile edge computing (MEC) for receiving services based on UE location.

[0006] As 5G mobile communication systems are commercialized, the already exponentially growing number of connected devices will be connected to the communication network, and it is accordingly expected that enhanced functionality and performance of the 5G mobile communication systems and integrated operations of the connected devices will be necessary. To this end, new research related to extended reality (XR) is planned for effectively supporting AR (augmented reality), VR (virtual reality), MR (mixed reality), etc., improving 5G performance and reducing complexity by utilizing artificial intelligence (AI) and machine learning (ML), AI service support, metaverse service support, and drone communications.

[0007] In addition, such development of 5G mobile communication systems will serve as the basis for not only developing new waveforms that provide terahertz band coverage for 6G mobile communication technology, multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas, metamaterial-based lenses and antennas for improving terahertz band signal coverage, high-dimensional spatial multiplexing technology using OAM (orbital angular momentum), and RIS (reconfigurable smart surface), but also for developing full-duplex technology that improves the frequency efficiency of 6G mobile communication technology and improves system networks, AI-based communication technology for achieving system optimization by utilizing satellites and AI (artificial intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for achieving services with a complexity level that exceeds the limits of UE operating capabilities by utilizing ultra-high performance communication and computing resources. Summary of the invention

[0008] Technical issues

[0009] Currently, there is a need to enhance the CSI reporting process in multi-TRP scenarios.

[0010] Solution to the problem

[0011] The present disclosure relates to apparatus and methods for CSI reporting in multi-TRP (mTRP) operations.

[0012] In one embodiment, a user equipment (UE) is provided. The UE includes a transceiver configured to receive information about a CSI report. The information indicates N trp CSI reference signal (CSI-RS) resources, where: N trp >1. The UE further comprises a processor operably coupled to the transceiver. Based on the information, the processor is configured to: N trp CSI-RS resources, and determine N≤N trp CSI reports associated with CSI-RS resources, where: N∈{1,2,…,N trp}. The CSI report includes the strongest coefficient indicator (SCI) for each layer l (SCI l ). SCI l instruct The index of the strongest coefficient among the coefficients. l∈{1,…,υ} is the layer index, υ≥1 is the rank value, and is the total number of non-zero coefficients of layer 1 associated with the CSI-RS ports corresponding to the N CSI-RS resources. The transceiver is also configured to send a CSI report.

[0013] In another embodiment, a base station (BS) is provided. The BS includes a processor configured to identify information about a CSI report. The information indicates that N trp CSI-RS resources, where N trp >1. The BS also includes a transceiver operably coupled to the processor. The transceiver is configured to send information about the CSI report and receive information including the SCI l CSI report. CSI report and N≤N trp CSI-RS resources are associated, where: N∈{1,2,…,N trp}. SCI l instruct The index of the strongest coefficient among the coefficients. l∈{1,…,υ} is the layer index, υ≥1 is the rank value, and is the total number of non-zero coefficients of layer 1 associated with the CSI-RS ports corresponding to the N CSI-RS resources.

[0014] In another embodiment, a method performed by a UE is provided. The method includes receiving information about a CSI report. The information indicates N trp CSI-RS resources, where N trp >1. The method further comprises: based on the information, measuring N trpCSI-RS resources, and determine ≤N trp CSI reports associated with CSI-RS resources, where: N∈{1,2,…,N trp}. CSI report includes SCIl. SCIl indicates The index of the strongest coefficient among the coefficients. l∈{1,…,υ} is the layer index, ν≥1 is the rank value, and is the total number of non-zero coefficients of layer 1 associated with the CSI-RS ports corresponding to the N CSI-RS resources. The method also includes sending a CSI report.

[0015] In another embodiment, a method performed by a BS is provided. The method includes identifying information about a channel state information (CSI) report indicating that N trp CSI reference signal (CSI-RS) resources, where: N trp >1; and sending information about CSI reporting; and receiving the strongest coefficient indicator (SCI) (SCI) for each layer l l ) of the CSI report, where: CSI report and N≤N trp CSI-RS resources are associated, where: N∈{1,2,…,N trp},SCI l instruct is the index of the strongest coefficient among the coefficients, and l∈{1,…,v} is the layer index, v≥1 is the rank value, and is the total number of non-zero coefficients of layer 1 associated with the CSI-RS ports corresponding to the N CSI-RS resources.

[0016] Other technical features may be apparent to those skilled in the art from the following drawings, descriptions and claims.

[0017] Before the following detailed description, it may be advantageous to set forth the definitions of certain words and phrases used throughout this patent document. The term "coupling" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not these elements are in physical contact with each other. The terms "send", "receive" and "communication" and their derivatives cover both direct and indirect communication. The terms "include" and "comprise" and their derivatives mean including but not limited to. The term "or" is inclusive, meaning and / or. The phrase "associated with ... " and its derivatives mean including, included in ..., interconnected with ..., including, included in ..., connected to or with ..., coupled to or with ..., can communicate with ..., collaborate with ..., interlace, juxtapose, approach, be coupled to or with ..., have, have ... property, have to or with ... relationship, etc. The term "controller" means any device, system or part thereof that controls at least one operation. Such a controller can be implemented in hardware or a combination of hardware and software and / or firmware. The function associated with any particular controller can be centralized or distributed, whether local or remote. The phrase "at least one of" when used with a list of items means that different combinations of one or more of the listed items can be used, and that only one of the items in the list may be required. For example, "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.

[0018] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or a portion thereof that are suitable for implementation in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disk (CD), a digital video disk (DVD) or any other type of memory. "Non-transitory" computer-readable media excludes wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media in which data can be permanently stored and media in which data can be stored and rewritten later, such as rewritable optical disks or erasable memory devices.

[0019] Definitions for certain other words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

[0020] Beneficial Effects of the Invention

[0021] According to various embodiments of the present disclosure, the CSI reporting process in multi-TRP scenarios can be effectively enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts:

[0023] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown;

[0024] Figure 2 An example gNodeB (gNB) according to an embodiment of the present disclosure is shown;

[0025] Figure 3 An example user equipment (UE) according to an embodiment of the present disclosure is shown;

[0026] Figure 4 An example antenna block or array for forming a beam according to an embodiment of the present disclosure is shown;

[0027] Figure 5 An example distributed multiple-input multiple-output (MIMO) system according to an embodiment of the present disclosure is shown;

[0028] Figure 6 An example distributed MIMO system according to an embodiment of the present disclosure is shown;

[0029] Figure 7 An example antenna port layout according to an embodiment of the present disclosure is shown;

[0030] Figure 8 A 3D grid of oversampled discrete Fourier transform (DFT) beams is shown according to an embodiment of the present disclosure;

[0031] Fig. 9 Two new codebooks according to embodiments of the present disclosure are shown;

[0032] Fig.10 An example distributed MIMO system is shown in which each TRP has a single antenna panel according to an embodiment of the present disclosure;

[0033] Fig.11An example distributed MIMO system is shown in which each TRP has multiple antenna panels according to an embodiment of the present disclosure;

[0034] Fig.12 An example distributed MIMO system is shown, wherein each TRP may be a single panel or multiple panels, according to an embodiment of the present disclosure;

[0035] Fig.13 A flowchart of an example method for operating a UE according to an embodiment of the present disclosure is shown;

[0036] Fig.14 A block diagram showing a user equipment (UE) according to an embodiment of the present disclosure; and

[0037] Fig.15 A block diagram of a base station (BS) according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0038] Before the following detailed description, it may be advantageous to set forth the definitions of certain words and phrases used throughout this patent document. The term "coupling" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not these elements are in physical contact with each other. The terms "send", "receive" and "communication" and their derivatives cover both direct and indirect communication. The terms "include" and "comprise" and their derivatives mean including but not limited to. The term "or" is inclusive, meaning and / or. The phrase "associated with ... " and its derivatives mean including, included in ..., interconnected with ..., including, included in ..., connected to or with ..., coupled to or with ..., can communicate with ..., collaborate with ..., interlace, juxtapose, approach, be coupled to or with ..., have, have ... property, have to or with ... relationship, etc. The term "controller" means any device, system or part thereof that controls at least one operation. Such a controller can be implemented in hardware or a combination of hardware and software and / or firmware. The function associated with any particular controller can be centralized or distributed, whether local or remote. The phrase "at least one of" when used with a list of items means that different combinations of one or more of the listed items can be used, and that only one of the items in the list may be required. For example, "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.

[0039] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or a portion thereof that are suitable for implementation in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disk (CD), a digital video disk (DVD) or any other type of memory. "Non-transitory" computer-readable media excludes wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media in which data can be permanently stored and media in which data can be stored and rewritten later, such as rewritable optical disks or erasable memory devices.

[0040] Definitions for other specific words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

[0041] Discussed below Figures 1 to 15 The various embodiments used to describe the principles of the present disclosure in the patent document are only illustrative and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0042] The following documents and standard descriptions are incorporated by reference into the present disclosure as if fully set forth herein: 3GPP TS 36.211 v17.2.0, "E-UTRA, Physical channels and modulation" (hereinafter referred to as "REF 1"); 3GPP TS 36.212 v17.2.0, "E-UTRA, Multiplexing and Channel coding" (hereinafter referred to as "REF 2"); 3GPP TS 36.213 v17.2.0, "E-UTRA, Physical Layer Procedures" (hereinafter referred to as "REF 3"); 3GPP TS 36.321 v17.1.0, "E-UTRA, Medium Access Control (MAC) protocol specification" (hereinafter referred to as "REF 4"); 3GPP TS 3GPP TS 38.214v17.2.0, “NR, Physical Layer Procedures for Data” (hereinafter referred to as “REF 9”); 3GPP TS 38.215v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “REF 10”); 3GPP TS 38.216v17.2.0, “NR, Physical Layer Procedures for Data” (hereinafter referred to as “REF 11”); 3GPP TS 38.217v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “REF 12”); 3GPP TS 38.218v17.2.0, “NR, Physical Layer Procedures for Data” (hereinafter referred to as “REF 13”); 3GPP TS 38.219v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “REF 14”); 3GPP TS 38.211v17.2.0, “NR, Physical channels and modulation” (hereinafter referred to as “REF 6”); 3GPP TS 38.212v17.2.0, “NR, Multiplexing and Channel coding” (hereinafter referred to as “REF 7”); 3GPP TS 38.213v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “REF 8”); 3GPP TS 3GPP TS 38.215 v17.1.0, “NR, Physical Layer Measurements” (hereinafter referred to as “REF 10”); 3GPP TS 38.321 v17.1.0, "NR, Medium Access Control (MAC) protocol specification" (hereinafter referred to as "REF 11"); 3GPP TS 38.331v17.1.0, "NR, Radio Resource Control (RRC) Protocol Specification" (hereinafter referred to as "REF 12"). .

[0043] Wireless communication has been one of the most successful innovations in modern history. Recently, the number of subscribers to wireless communication services exceeded 5 billion and continues to grow rapidly. Due to the increasing popularity of smart phones and other mobile data devices (such as tablet computers, "B-notebook" computers, netbooks, e-book readers and machine-type devices) among consumers and enterprises, the demand for wireless data traffic has increased rapidly. In order to meet the high growth of mobile data traffic and support new applications and deployments, improvements in radio interface efficiency and coverage are critical.

[0044] In order to meet the demand for wireless data services that has increased since the deployment of 4G communication systems and to realize various vertical applications, 5G / NR communication systems have been developed and are currently being deployed. 5G / NR communication systems are considered to be implemented in higher frequency (mmWave) bands (e.g., 28 GHz or 60 GHz bands) to achieve higher data rates, or in lower frequency bands (e.g., 6 GHz) to achieve robust coverage and mobility support. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed in 5G / NR communication systems.

[0045] In addition, in the 5G / NR communication system, system network improvements are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc.

[0046] The discussion of 5G systems and frequency bands associated therewith is for reference, as certain embodiments of the present disclosure may be implemented in 5G systems. However, the present disclosure is not limited to 5G systems or frequency bands associated therewith, and embodiments of the present disclosure may be used in conjunction with any frequency band. For example, aspects of the present disclosure may also be applied to 5G communication systems, 6G, or even later deployments that may use terahertz (THz) frequency bands.

[0047] The following Figure 1-3 Various embodiments are described that are implemented in a wireless communication system and utilizing Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication techniques. Figure 1-3 The description is not meant to imply physical or architectural limitations to the manner in which different embodiments may be implemented. Different embodiments of the present disclosure may be implemented in any suitably arranged communications system.

[0048] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown. Figure 1 The embodiment of the wireless network shown is for illustration only. Other embodiments of the wireless network 100 may be used without departing from the scope of the present disclosure.

[0049] like Figure 1 As shown, the wireless network includes gNB 101 (e.g., base station, BS), gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one network 130 such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.

[0050] gNB 102 provides wireless broadband access to network 130 for a first plurality of user equipment (UE) within coverage area 120 of gNB 102. The first plurality of UEs include: UE 111, which may be located in a small business; UE 112, which may be located in an enterprise; UE 113, which may be a WiFi hotspot; UE 114, which may be located in a first residence; UE 115, which may be located in a second residence; and UE 116, which may be a mobile device such as a cellular phone, a wireless laptop, a wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within coverage area 125 of gNB 103. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of gNBs 101-103 may communicate with each other and with UEs 111-116 using 5G / NR, Long Term Evolution (LTE), Long Term Evolution-Advanced (LTE-A), WiMAX, WiFi, or other wireless communication technologies.

[0051] Depending on the network type, the term "base station" or "BS" may refer to any component (or collection of components) configured to provide wireless access to a network, such as a transmission point (TP), a transmission-reception point (or a transmission and reception point, TRP), an enhanced base station (eNodeB or eNB), a 5G / NR base station (gNB), a macro cell, a femto cell, a WiFi access point (AP), or other wireless enabling devices. The base station may provide wireless access according to one or more wireless communication protocols (e.g., 5G / NR Third Generation Partnership Project (3GPP) NR, Long Term Evolution (LTE), LTE Advanced (LTE-A), High Speed ​​Packet Access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc.). For convenience, the terms "BS" and "TRP" are used interchangeably in this patent to refer to network infrastructure components that provide wireless access to remote terminals. In addition, depending on the network type, the term "user equipment" or "UE" may refer to any component, such as a "mobile station", "subscriber station", "remote terminal", "wireless terminal", "reception point", or "user equipment". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to a remote wireless device that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or is generally considered a fixed device (such as a desktop computer or vending machine).

[0052] The dashed lines illustrate the approximate extents of coverage areas 120 and 125, which are shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with a gNB, such as coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the radio environment associated with natural and man-made obstacles.

[0053] As described in more detail below, one or more of UEs 111-116 include circuitry, programming, or a combination thereof for supporting CSI reporting in multi-TRP operations. In certain embodiments, one or more of BSs 101-103 include circuitry, programming, or a combination thereof for supporting CSI reporting in multi-TRP operations.

[0054] although Figure 1 An example of a wireless network is shown, but Figure 1Various changes may be made. For example, the wireless network may include any number of gNBs and any number of UEs in any suitable arrangement. In addition, gNB 101 may communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 may communicate directly with network 130 and provide the UEs with direct wireless broadband access to network 130. In addition, gNBs 101, 102, and / or 103 may provide access to other or additional external networks, such as an external telephone network or other type of data network.

[0055] Figure 2 An example gNB 102 is shown according to an embodiment of the present disclosure. Figure 2 The embodiment of the gNB 102 shown in FIG. is for illustration only, and Figure 1 gNBs 101 and 103 may have the same or similar configurations. However, gNBs have a variety of configurations, and Figure 2 The scope of the present disclosure is not limited to any particular implementation of the gNB.

[0056] like Figure 2 As shown, the gNB 102 includes multiple antennas 205a-205n, multiple transceivers 210a-210n, a controller / processor 225, a memory 230, and a backhaul or network interface 235.

[0057] The transceivers 210a-210n receive input RF signals from antennas 205a-205n, such as signals transmitted by UEs in the network 100. The transceivers 210a-210n downconvert the input RF signals to generate IF or baseband signals. The IF or baseband signals are processed by receive (RX) processing circuits in the transceivers 210a-210n and / or the controller / processor 225, which generate processed baseband signals by filtering, decoding and / or digitizing the baseband or IF signals. The controller / processor 225 may further process the baseband signals.

[0058] Transmit (TX) processing circuitry in the transceivers 210a-210n and / or the controller / processor 225 receives analog or digital data (such as voice data, web data, email, or interactive video game data) from the controller / processor 225. The TX processing circuitry encodes, multiplexes, and / or digitizes the output baseband data to generate processed baseband or IF signals. The transceivers 210a-210n up-convert the baseband or IF signals to RF signals that are transmitted via the antennas 205a-205n.

[0059] The controller / processor 225 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 225 may control the reception of UL channel signals and the transmission of DL channel signals by the transceivers 210a-210n according to well-known principles. The controller / processor 225 may also support additional functionality, such as more advanced wireless communication functionality. For example, the controller / processor 225 may support beamforming or directional routing operations, in which input / output signals from / to multiple antennas 205a-205n are weighted differently to effectively direct the output signals in a desired direction. As another example, the controller / processor 225 may support methods for supporting CSI reporting in multi-TRP operations. The controller / processor 225 may support any of a variety of other functions in the gNB 102.

[0060] The controller / processor 225 is also capable of executing programs and other processes resident in the memory 230, such as processes for supporting CSI reporting in multi-TRP operation. The controller / processor 225 can move data into or out of the memory 230 as required by the executing process.

[0061] The controller / processor 225 is also coupled to a backhaul or network interface 235. The backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or via a network. The interface 235 may support communication via any suitable wired or wireless connection. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G / NR, LTE, or LTE-A), the interface 235 may allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 235 may allow the gNB 102 to communicate with a larger network (such as the Internet) via a wired or wireless local area network or via a wired or wireless connection. The interface 235 includes any suitable structure that supports communication via a wired or wireless connection, such as Ethernet or a transceiver.

[0062] Memory 230 is coupled to controller / processor 225. A portion of memory 230 may include RAM, and another portion of memory 230 may include flash memory or other ROM.

[0063] although Figure 2 An example of a gNB 102 is shown, but the Figure 2 For example, gNB 102 may include any number of Figure 2 Each component shown in . In addition, Figure 2The various components in may be combined, further subdivided, or omitted, and additional components may be added according to specific needs.

[0064] Figure 3 An example UE 116 is shown in accordance with an embodiment of the present disclosure. Figure 3 The embodiment of UE 116 shown in FIG. 1 is for illustration only, and Figure 1 UEs 111-115 may have the same or similar configurations. However, UEs have a variety of configurations, and Figure 3 The scope of the present disclosure is not limited to any particular implementation of the UE.

[0065] like Figure 3 As shown, UE 116 includes antenna 305, transceiver 310, and microphone 320. UE 116 also includes speaker 330, processor 340, input / output (I / O) interface (IF) 345, input 350, display 355, and memory 360. Memory 360 includes operating system (OS) 361 and one or more applications 362.

[0066] Transceiver 310 receives an incoming RF signal from antenna 305 transmitted by a gNB of network 100. Transceiver 310 downconverts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is processed by RX processing circuitry in transceiver 310 and / or processor 340, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. The RX processing circuitry transmits the processed baseband signal to speaker 330 (such as for voice data) or is processed by processor 340 (such as for web browsing data).

[0067] The TX processing circuit in the transceiver 310 and / or the processor 340 receives analog or digital voice data from the microphone 320, or receives other output baseband data (such as web data, email, or interactive video game data) from the processor 340. The TX processing circuit encodes, multiplexes, and / or digitizes the output baseband data to generate a processed baseband or IF signal. The transceiver 310 up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 305.

[0068] The processor 340 may include one or more processors or other processing devices and execute the OS 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the processor 340 may control the transceiver 310 to receive DL channel signals and transmit UL channel signals according to well-known principles. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.

[0069] The processor 340 is also capable of executing other processes and programs resident in the memory 360, such as processes for supporting CSI reporting in multi-TRP operation. The processor 340 can move data into or out of the memory 360 as needed for the executed process. In some embodiments, the processor 340 is configured to execute the application 362 based on the OS 361 or in response to a signal received from the gNB or 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 laptops and handheld computers. The I / O interface 345 is the communication path between these accessories and the processor 340.

[0070] Processor 340 is also coupled to input 350 including, for example, a touch screen, a keypad, etc., and display 355. An operator of UE 116 may use input 350 to enter data into UE 116. Display 355 may be a liquid crystal display, a light emitting diode display, or other display capable of presenting text and / or at least limited graphics, such as from a website.

[0071] Memory 360 is coupled to processor 340. A portion of memory 360 may include random access memory (RAM), and another portion of memory 360 may include flash memory or other read-only memory (ROM).

[0072] although Figure 3 An example of UE 116 is shown, but the Figure 3 For example, they can be combined, further subdivided, or omitted Figure 3 , and additional components may be added as needed. As a specific example, processor 340 may be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). In another example, transceiver 310 may include any number of transceivers and signal processing chains and may be connected to any number of antennas. In addition, although Figure 3 The UE 116 is shown configured as a mobile phone or smart phone, but the UE may be configured to operate as other types of mobile or stationary devices.

[0073] The 3GPP NR specification supports up to 32 CSI-RS antenna ports, which enables gNBs to be equipped with a large number of antenna elements (such as 64 or 128). In this case, multiple antenna elements are mapped to one CSI-RS port. For next-generation cellular systems such as 5G, the maximum number of CSI-RS ports may remain the same or increase.

[0074] Figure 4An example antenna block or array 400 is shown in accordance with an embodiment of the present disclosure. Figure 4 The embodiment of antenna block or array 400 shown in FIG. 4 is for illustration only. Figure 4 The scope of the present disclosure is not limited to any particular implementation of an antenna block or array.

[0075] For mmWave bands, although the number of antenna elements can be larger for a given form factor, the number of CSI-RS ports—which may correspond to the number of digital precoding ports—tends to be limited due to hardware constraints such as the feasibility of installing a large number of ADCs / DACs at mmWave frequencies, as shown in Figure 2. Figure 4 As shown. In this case, one CSI-RS port is mapped to a large number of antenna elements that can be controlled by a bank of analog phase shifters 401. One CSI-RS port can then correspond to a subarray that produces a narrow analog beam through analog beamforming 405. The analog beam can be configured to scan a wider range of angles 420 by changing the phase shifter bank across symbols or subframes. The number of subarrays (equal to the number of RF chains) is proportional to the number of CSI-RS ports N. CSI-PORT The digital beamforming unit 410 spans N CSI-PORT The analog beams are linearly combined to further increase the precoding gain. While the analog beams are wideband (and therefore not frequency selective), the digital precoding can vary across frequency subbands or resource blocks. Receiver operation can be similarly envisioned.

[0076] Since the above-described system utilizes multiple simulated beams for transmission and reception (wherein one or a small number of simulated beams are selected from a large number of simulated beams, for example, from time to time after a training duration), the term "multi-beam operation" is used to refer to the entire system aspect. For the purpose of description, this includes indicating an assigned DL or UL transmit (TX) beam (also referred to as "beam indication"), measuring at least one reference signal for calculating and performing beam reporting (also referred to as "beam measurement" and "beam reporting", respectively), and receiving DL or UL transmissions via selecting a corresponding receive (RX) beam.

[0077] The above system is also applicable to higher frequency bands, such as >52.6GHz (also known as FR4). In this case, the system can use only analog beams. Due to the O2 absorption loss near 60GHz frequency (~10dB additional loss at 100m distance), a larger number and sharper analog beams (thus a larger number of radiators in the array) will be required to compensate for the additional path loss.

[0078] On the other hand, at lower frequency bands such as <1 GHz, the number of antenna elements may not be large in a given form factor due to the large wavelength. As an example, for the case of wavelength size (λ) of 50 cm for a center frequency of 600 MHz, 4 m is expected for a uniform linear array (ULA) antenna panel of 16 antenna elements, where the distance between two adjacent antenna elements is half a wavelength. Considering that multiple antenna elements are mapped to one digital port in practical cases, the expected size of the antenna panel at the gNB to support a large number of antenna ports (such as 32 CSI-RS ports) becomes very large in such low frequency bands, and it leads to difficulties in deploying 2-D antenna element arrays within the size of traditional form factors. This leads to a limited number of CSI-RS ports that can be supported at a single site and limits the spectral efficiency of such systems.

[0079] Various embodiments of the present disclosure recognize that for cellular systems operating in the sub-1 GHz frequency range (e.g., less than 1 GHz), it is challenging to support a large number of CSI-RS antenna ports (e.g., 32) at a single location or remote radio head (RRH) or TRP because larger antenna form factor sizes are required at these frequencies than for systems operating at higher frequencies (such as 2 GHz or 4 GHz). At such low frequencies, the maximum number of CSI-RS antenna ports that can be co-located at a single site (or TRP / RRH) may be limited, for example, to 8. This limits the spectral efficiency of such a system. In particular, the MU-MIMO spatial multiplexing gain provided by a large number of CSI-RS antenna ports (such as 32) cannot be achieved.

[0080] One way to operate a sub-1 GHz system with a large number of CSI-RS antenna ports is based on distributing antenna ports at multiple locations (or TRPs / RRHs). Multiple sites or TRPs / RRHs can still be connected to a single (common) base unit, so the signals sent / received via multiple distributed TRPs / RRHs can still be processed at a centralized location. This is called distributed MIMO or multi-TRP coherent joint transmission (C-JT).

[0081] Therefore, various embodiments of the present disclosure consider multi-TRP C-JT scenarios and propose methods and devices for CSI reporting in multi-TRP scenarios.

[0082] Various embodiments of the present disclosure recognize that the CSI enhancement described in Rel-18 MIMO takes into account the Rel-16 / 17 Type-IICSI codebook refinement to support mTRP coherent joint transmission (C-JT) operation by considering performance and overhead trade-offs. The Rel-16 / 17 Type-IICSI codebook has three components W 1 ,W2 and W f Due to the power imbalance between TRPs, W across TRPs 2 The CSI coefficients in the TRP may have different reference amplitude values. A component for indicating reference values ​​across TRPs needs to be supported in Rel-18.

[0083] Therefore, various embodiments of the present disclosure provide components W in addition to those for multi-TRP C-JT scenarios. 1 and W 2 In addition, it is used to indicate the use of W 2 The reference value of the component.

[0084] Figure 5 An example distributed MIMO system 500 is shown in accordance with an embodiment of the present disclosure. Figure 5 The illustrated embodiment of distributed MIMO system 500 is for illustration only. Figure 5 The scope of the present disclosure is not limited to any particular implementation of distributed MIMO system 500 .

[0085] One possible way to solve this problem is to form multiple TRPs (multi-TRPs) or RRHs with a small number of antenna ports, instead of integrating all antenna ports in a single panel (or at a single site), and distribute multiple panels in multiple locations / sites (or TRPs, RRHs). Figure 5 shown.

[0086] Figure 6 An example distributed MIMO system 600 is shown in accordance with an embodiment of the present disclosure. Figure 6 The illustrated embodiment of distributed MIMO system 600 is for illustration only. Figure 6 The scope of the present disclosure is not limited to any particular implementation of distributed MIMO system 600 .

[0087] like Figure 6 As shown, multiple TRPs at multiple locations can still be connected to a single base unit, and thus signals sent / received via multiple distributed TRPs can be processed in a centralized manner by the single base unit.

[0088] Note that although this disclosure has mentioned low-band systems (below 1 GHz bands) as motivation for distributed MIMO (or mTRP), distributed MIMO technology is band-agnostic and can be used for mid-band (below 6 GHz) and high-band (above 6 GHz) systems in addition to low-band (below 1 GHz) systems.

[0089] The term “distributed MIMO” is used for illustrative purposes and may be considered under another term such as multi-TRP, mTRP, cell-free network, etc.

[0090] All the following components and embodiments are applicable to UL transmission with CP-OFDM (Cyclic Prefix OFDM) waveform as well as DFT-SOFDM (DFT-Spread OFDM) and SC-FDMA (Single Carrier FDMA) waveform. In addition, when the scheduling unit is one subframe (which may be composed of one or more time slots) or one time slot in time, all the following components and embodiments are applicable to UL transmission.

[0091] In the present disclosure, the frequency resolution (reporting granularity) and span (reporting bandwidth) of CSI reports may be defined in terms of frequency "sub-bands" and "CSI reporting bands" (CRBs), respectively.

[0092] The subband for CSI reporting is defined as a set of contiguous PRBs, which represents the minimum frequency unit for CSI reporting. For a given value of the DL system bandwidth, the number of PRBs in a subband can be fixed, semi-statically configured via high-layer / RRC signaling, or dynamically configured via L1DL control signaling or MAC control element (MAC CE). The number of PRBs in a subband can be included in the CSI reporting settings.

[0093] A "CSI reporting band" is defined as a set / set of sub-bands, either contiguous or non-contiguous, in which CSI reporting is performed. For example, a CSI reporting band may include all sub-bands within the DL system bandwidth. This may also be referred to as a "full band". Alternatively, a CSI reporting band may include only a set of sub-bands within the DL system bandwidth. This may also be referred to as a "partial band".

[0094] The term "CSI reporting band" is used only as an example to indicate the functionality. Other terms such as "CSI reporting subband set" or "CSI reporting bandwidth" may also be used.

[0095] In terms of UE configuration, the UE may be configured with at least one CSI reporting band. The configuration may be semi-static (via high-layer signaling or RRC) or dynamic (via MAC CE or L1DL control signaling). When multiple (N) CSI reporting bands are configured (e.g., via RRC signaling), the UE may report CSI associated with n≤N CSI reporting bands. For example, >6GHz, large system bandwidths may require multiple CSI reporting bands. The value of n may be configured semi-statically (via high-layer signaling or RRC) or dynamically (via MAC CE or L1DL control signaling). Alternatively, the UE may report a recommended value of n via the UL channel.

[0096] Therefore, the CSI parameter frequency granularity may be defined for each CSI reporting band as follows. When one CSI parameter is used for all Mn subbands within a CSI reporting band, the CSI parameter is configured with a "single" report for a CSI reporting band having Mn subbands. When one CSI parameter is reported for each of the Mn subbands within a CSI reporting band, the CSI parameter is configured with a "subband" for a CSI reporting band having Mn subbands.

[0097] Figure 7 An example antenna port layout 700 is shown according to an embodiment of the present disclosure. Fig.13 The embodiment of antenna port layout 700 shown in FIG. 7 is for illustration only. Figure 7 The scope of the present disclosure is not limited to any particular implementation of the antenna port layout.

[0098] like Figure 7 As shown, N1 and N2 are the number of antenna ports with the same polarization in the first dimension and the second dimension, respectively. For a 2D antenna port layout, N1>1, N2>1, and for a 1D antenna port layout, N1>1 and N2=1. Therefore, for a dual-polarized antenna port layout, when each antenna is mapped to an antenna port, the total number of antenna ports is 2N1N2. Figure 7 The following diagram is shown in FIG, where “X” represents two antenna polarizations. In this disclosure, the term “polarization” refers to a set of antenna ports. For example, antenna ports comprising a first antenna polarization, and an antenna port Includes the second antenna polarization, where: P CSIRS is the number of CSI-RS antenna ports, and X is the starting antenna port number (e.g., X=3000, then the antenna ports are 3000, 3001, 3002, ...). Let N g It can be the number of antenna panels at the gNB. When there are multiple antenna panels (N g >1), we assume that each panel is a dual-polarized antenna port with two-dimensional N 1 and N 2 port. This Figure 7 Note that the antenna port layout can be the same or different in different antenna panels.

[0099] In one example, an antenna architecture of a D-MIMO or CJT (coherent joint transmission) system is constructed. For example, the antenna structure at each RRH (or TRP) is dual-polarized (eg Figure 7The antenna structure at each RRH / TRP may be the same. Alternatively, the antenna structure at one RRH / TRP may be different from another RRH / TRP. Similarly, the number of ports at each RRH / TRP may be the same. Alternatively, the number of ports at one RRH / TRP may be different from another RRH / TRP. In one example, the number of RRH / TRPs in D-MIMO transmission N g =N RRH .

[0100] In another example, the antenna architecture of a D-MIMO or CJT system is unstructured. For example, the antenna structure at one RRH / TRP may be different from another RRH / TRP.

[0101] The rest of this disclosure assumes a structured antenna architecture. For simplicity, in the rest of this disclosure, it is assumed that each RRH / TRP is equivalent to a panel, but the RRH / TRP may have multiple panels in practice. However, this disclosure is not limited to the single panel assumption at each RRH / TRP, and can be easily extended (covered) when the RRH / TRP has multiple antenna panels.

[0102] In one embodiment, the RRH constitutes (or corresponds to or is equivalent to) at least one of the following:

[0103] ●In one example, the RRH corresponds to the TRP.

[0104] ● In one example, the RRH or TRP corresponds to the CSI-RS resource. The UE is configured with: K = N RRH >1 non-zero power (NZP) CSI-RS resource, and the CSI report is configured to span multiple CSI-RS resources. This is similar to the Class B, K>1 configuration in Rel.14 LTE. The K NZP CSI-RS resources may belong to one CSI-RS resource set or multiple CSI-RS resource sets (e.g., each of the K resource sets includes one CSI-RS resource). The details are as previously explained in this disclosure.

[0105] ● In one example, an RRH or TRP corresponds to a CSI-RS resource group, where the group includes one or more NZPs

[0106] CSI-RS resources. The UE is configured with: K ≥ N RRH >1 non-zero power (NZP) CSI-RS resource, and

[0107] The CSI report is configured to span multiple CSI-RS resources from a resource group. This is similar to B in Rel.14 LTE.

[0108] The K NZP CSI-RS resources may belong to one CSI-RS resource set or multiple CSI-RS resource sets (e.g., each of the K resource sets includes one CSI-RS resource). The details are as explained previously in this disclosure. In particular, the K CSI-RS resources may be divided into N RRH Resource group. Information about resource grouping may be provided together with the CSI-RS resource setting / configuration, or together with the CSI report setting / configuration, or together with the CSI-RS resource configuration.

[0109] ● In one example, the RRH or TRP corresponds to a subset (or group) of CSI-RS ports. The UE is configured with at least one NZP CSI-RS resource including the CSI-RS ports (or associated CSI-RS ports).

[0110] The CSI-RS ports may be grouped (or partitioned) into multiple subsets / groups / parts of antenna ports, each of which corresponds to (or constitutes) an RRH / TRP. Information about the subset of ports or the grouping of ports may be provided together with the CSI-RS resource setting / configuration, or provided together with the CSI report setting / configuration, or provided together with the CSI-RS resource configuration.

[0111] ● In one example, the RRH or TRP corresponds to one or more of the above examples according to the configuration. For example, the configuration may be explicit via parameters (eg, RRC parameters). Alternatively, it may be implicit.

[0112] ○ In one example, when implicit, it can be based on the value of K. For example, when K>1 CSI-RS resource, the RRH corresponds to one or more of the above examples, and when K=1 CSI-RS resource, the RRH corresponds to one or more of the above examples.

[0113] ○ In another example, the configuration can be based on the configured codebook. For example, when the codebook corresponds to a decoupled codebook (modular or separate codebook for each RRH), the RRH corresponds to a CSI-RS resource or resource group, and when the codebook corresponds to a coupled (joint or coherent) codebook (one joint codebook across TRPs / RRHs), the RRH corresponds to a subset (or group) of CSI-RS ports.

[0114] In one example, when the RRH or TRP maps (or corresponds to) a CSI-RS resource or resource group, and the UE can select a subset of RRHs (resources or resource groups) and report the CSI of the selected TRP / RRHs (resources or resource groups), the selected TRP / RRH can be reported via an indicator. For example, the indicator can be CRI or PMI (component) or a new indicator.

[0115] In one example, when the RRH or TRP maps (or corresponds to) a CSI-RS port group, and the UE can select a subset of the TRP / RRH (port group) and report the CSI of the selected TRP / RRH (port group), the selected TRP / RRH can be reported via an indicator. For example, the indicator can be CRI or PMI (component) or a new indicator.

[0116] In one example, when multiple (K>1) CSI-RS resources are configured for N RRH TRP / RRH, using / configuring a decoupled (modular) codebook, and when a single (K=1) CSI-RS resource is used for N RRH TRP / RRH, use / configure a joint codebook.

[0117] As described in U.S. Patent No. 10,659,118, entitled “Method and Apparatus for Explicit CSI Reporting in Advanced Wireless Communication Systems,” issued on May 19, 2020, which is incorporated herein by reference in its entirety, a UE is configured with high-resolution (e.g., Type II) CSI reporting, where a linear combination-based Type I CSI reporting framework is extended to include a frequency dimension in addition to the first and second antenna port dimensions.

[0118] Figure 8 A 3D grid of oversampled DFT beams 800 is shown in accordance with an embodiment of the present disclosure. Figure 8 The embodiment of the 3D grid of oversampled DFT beams 800 shown in FIG. 8 is for illustration only. Figure 8 The scope of the present disclosure is not limited to any particular implementation of the 3D grid of oversampled DFT beams.

[0119] As shown in the figure, Figure 8 A 3D grid 800 of oversampled DFT beams (first port dimension, second port dimension, frequency dimension) is shown, where:

[0120] The first dimension is associated with the first port dimension,

[0121] The second dimension is associated with the second port dimension, and

[0122] ●The third dimension is associated with the frequency dimension.

[0123] The basic sets for the first and second port domain representations are oversampled DFT codebooks of length N1 and length N2, respectively, and have oversampling factors O1 and O2, respectively. Similarly, the basic set for the frequency domain representation (i.e., the 3rd dimension) is an oversampled DFT codebook of length N3 and with an oversampling factor O3. In one example, O1=O2=O3=4. In one example, O1=O2=4 and O3=1. In another example, the oversampling factor Oi belongs to {2,4,8}. In yet another example, at least one of O1, O2 and O3 is configured by a high layer (via RRC signaling).

[0124] As explained in section 5.2.2.2.6 of REF 9, the UE is configured with the higher layer parameter codebookType set to "typeII-PortSelection-r16" for enhanced type IICSI reporting, where the precoder for all SBs and for a given layer l=1,..,v (where v is the associated RI value)

[0125]

[0126] or

[0127]

[0128] in:

[0129] ●N 1 is the number of antenna ports (with the same antenna polarization) in the first antenna port dimension,

[0130] ●N 2 is the number of antenna ports (with the same antenna polarization) in the second antenna port dimension,

[0131] ●P CSI-RS is the number of CSI-RS ports configured for the UE,

[0132] ●N 3 is the number of SBs or the number of FD units or FD components used for PMI reporting (which includes the CSI reporting band)

[0133] or the total number of precoding matrices indicated by the PMI (one for each FD unit / component),

[0134] ●a i It is 2N 1 N 2×1 (Equation 1) or N 1 N 2 ×1 (Equation 2) column vector, or a i YesP CSIRS ×1 (Equation 1) or

[0135] a port selection column vector, where a port selection vector is defined as a vector containing the value 1 in one element and the value 0 in the other elements,

[0136] ●b f YesN 3 ×1 column vector,

[0137] ●c l,i,f are complex coefficients.

[0138] In a variant, when the UE reports a subset of K < 2LM coefficients (where K is either fixed, configured by the gNB, or reported by the UE), then the coefficient c in the precoder equation 1 or equation 2 is l,i,f Can be replaced by x l,i,f ×C l,i,f in

[0139] ● According to some embodiments of the present disclosure, x l,i,f =1, if the coefficient c l,i,f Reported by UE.

[0140] ●Otherwise x l,i,f =0, (i.e., c l,i,f Not reported by UE).

[0141] Indicates whether x l,i,f =1 or 0 is according to some embodiments of the present disclosure. For example, it can be via a bitmap.

[0142] In a variation, the precoder equation, Equation 1 or Equation 2, respectively, is generalized as:

[0143]

[0144] and

[0145]

[0146] where for a given i, the number of basis vectors is M i And the corresponding basis vectors are {b i,f}. Note that M i is the coefficient c l,i,f The number reported by the UE for a given i, where m i ≤M(where {M i} or ∑M i(is fixed, configured by the gNB, or reported by the UE).

[0147] Column W l is normalized to norm 1. For rank R or R layers (υ = R), the precoding matrix is given by: It is assumed to be Equation 2 for the remainder of this disclosure. However, embodiments of this disclosure are general and also apply to Equation 1, Equation 3, and Equation 4.

[0148] Here, and M ≤ N3. If then A is the identity matrix and is therefore not reported. Similarly, if M = N3, then B is the identity matrix and is therefore not reported. Assuming M < N3, in the example, to report the columns of B, an oversampled DFT codebook is used. For example, b f = w f where the quantity w f is given by:

[0149]

[0150] When O 3 = 1, the FD basis vectors for layer l ∈ {1,.., v} (where v is the RI or rank value) are given by:

[0151]

[0152] where, and where

[0153] In another example, a discrete cosine transform DCT basis is used to construct / report the basis B for the third dimension. The m-th column of the DCT compression matrix is simply given by:

[0154] and K = N 3 and m = 0, …, N 3 - 1.

[0155] Since the DCT is applied to real-valued coefficients, the DCT is applied separately to the real and imaginary components (of the channel or channel eigenvector). Alternatively, the DCT is applied separately to the magnitude and phase components (of the channel or channel eigenvector). The use of the DFT or DCT basis is for illustrative purposes only. This disclosure applies to any other basis vectors to construct / report A and B.

[0156] At a high level, the precoder W l can be described as follows.

[0157]

[0158] Where A=W 1 Corresponds to Rel.15 in the Type IICSI codebook 1 [REF9], and B = W f .

[0159] The matrix consists of all the desired linear combination coefficients (eg, magnitude and phase or real or imaginary parts). Each reported coefficient (c l,i,f =p l,i,f φ l,i,f ) is quantized into amplitude coefficients (p l,i,f ) and the phase coefficient (φ l,i,f In one example, the amplitude coefficient (p l,i,f ) is reported using an A-bit amplitude codebook, where A belongs to {2,3,4}. If multiple values ​​of A are supported, one value is configured via higher layer signaling. In another example, the amplitude coefficient (p l,i,f ) is reported as in

[0160] ● is the reference or first amplitude reported using the A1 bit amplitude codebook, where A1 belongs to {2,3,4}, and

[0161] ● is the difference or second amplitude reported using the A2-bit amplitude codebook, where A2≤A1 belongs to

[0162] {2,3,4}.

[0163] For layer l, let us denote the linear combination (LC) coefficients associated with the spatial domain (SD) basis vectors (or beams) i∈{0,1,…,2L-1} and the frequency domain (FD) basis vectors (or beams) f∈{0,1,…,M-1} as c l,i,f , and the strongest coefficient is The strongest coefficient is reported from K using bitmap reporting NZ non-zero (NZ) coefficients, where and β are configured by higher layers. The remaining 2LM-K not reported by the UE NZ The coefficients are assumed to be zero. The following quantification scheme is used to quantify / report K NZ NZ coefficients.

[0164] ●UE reports as follows for Quantification of the NZ coefficient in:

[0165] ○The strongest coefficient index (i * ,f *), where or

[0166] i. Strongest coefficient (hence its magnitude / phase is not reported)

[0167] ○ Use two antenna polarization specific reference amplitudes.

[0168] i. For the strongest coefficient The associated polarization, due to the reference amplitude Not reported

[0169] ii. For other polarizations, the reference amplitude Quantized to 4 bits.

[0170] 1.4-bit amplitude alphabet

[0171] ○For {c l,i,f ,(i,f)≠(i * ,f * )}:

[0172] i. For each polarization, the differential magnitude of the coefficients Calculated relative to the associated polarization-specific reference amplitude and quantized to 3 bits.

[0173] 1.3-bit amplitude alphabet is

[0174] 2. Note: Final quantization amplitude p l,i,f Depend on Given.

[0175] ii. Each phase is quantized to 8PSK (N ph =8) or 16PSK (N ph =16) (which is configurable).

[0176] For the strongest coefficient The relevant polarization * ∈{0,1}, we have And the reference amplitude For the other polarization, quantize (report) using the 4-bit amplitude codebook mentioned above And the reference amplitude

[0177] In Rel.16 enhanced Type II and Type II port selection codebooks, the UE may be configured to report MFD basis vectors. In one example, where R is configured from the top level from {1,2} and p is configured from Configured by higher layers. In one example, the p value is configured by higher layers for rank 1-2 CSI reporting. For rank > 2 (e.g., rank 3-4), the p value (denoted as v 0 ) can be different. In one example, for ranks 1-4, (p,v 0 ) together configure Right now, For ranks 1-2 and For ranks 3-4. In one example, N 3 =N SB ×R, where N SB is the number of SBs used for CQI reporting. In one example, M is replaced by M υ , to show its dependence on the rank value v, therefore, p is replaced by p υ ,υ∈{1,2} and v 0 Replace with p υ ,v∈{3,4}.

[0178] The UE may be configured to report, for each layer l∈{1,..,v} of rank vCSI, 3 The basis vectors are reported freely (independently) in one step M v FD basis vectors. Alternatively, the UE may be configured to report m in two steps as follows v FD basis vectors.

[0179] ● In step 1, select / report: N 3 ' <N 3 The intermediate set (InS) of basis vectors, where InS is common to all layers.

[0180] ● In step 2, for each layer l∈{1,..,υ} of the rank vCSI report, select N 3 The basis vectors of ′ are freely (independently) selected / reported by M v FD basis vectors.

[0181] In one example, when N 3 ≤19, use the one-step method, and when N 3 >19, use the two-step approach. In one example, where α>1 is fixed (eg, 2) or configurable.

[0182] The codebook parameters used in DFT-based frequency domain compression (Equation 5) are (L, p v forv∈{1,2},p v forv∈{3,4},β,α,N ph ). The set of values ​​for these codebook parameters is as follows.

[0183] ● L: The set of values ​​is generally {2,4}, except for ranks 1-2, 32 CSI-RS antenna ports, and R=1, where L∈{2,4,6}. ,.

[0184] ●

[0185] ●

[0186] α=2

[0187] ●N ph =16.

[0188] The set of values ​​for these codebook parameters is shown in Table 1.

[0189] Table 1

[0190]

[0191] In Rel.17 (further enhancement of type II port selection codebook), M∈{1,2}, Where K 1 =α×P CSIRS , and the codebook parameters (M, α, β) are configured by Table 2.

[0192] Table 2

[0193]

[0194]

[0195] The above framework (Equation 5) shows that in 2L (or K 1 ) SD beams / ports and M v Linear combinations (double summation) are used on the FD beams for multiple (N 3 ) The precoding matrix of the FD unit. By using the time domain (TD) basis matrix W t Replace the FD basis matrix W f , this framework can also be used to represent the precoding matrix in the time domain (TD), where W t The M column includes some form of delay or channel tap position. v TD beam. Therefore, the precoder W l It can be described as follows.

[0196]

[0197] In one example, M v The TD beam (indicates the delay or channel tap position) is from N 3 The TD beams are selected from the set, that is, N3 Corresponds to the maximum number of TD units, where each TD unit corresponds to a delay or channel tap position. In one example, the TD beam corresponds to a single delay or channel tap position. In another example, the TD beam corresponds to multiple delays or channel tap positions. In another example, the TD beam corresponds to a combination of multiple delays or channel tap positions.

[0198] In one example, the codebook used for CSI reporting is according to at least one of the following examples.

[0199] • In one example, the codebook may be a Rel.15 Type I single panel codebook (see 5.2.2.2.1, TS38.214).

[0200] • In one example, the codebook may be a Rel.15 Type I multi-panel codebook (see 5.2.2.2.2, TS38.214).

[0201] • In one example, the codebook may be a Rel.15 Type II codebook (see 5.2.2.2.3, TS 38.214).

[0202] ● In one example, the codebook may be a Rel.15 port selection type II codebook (see 5.2.2.2.4, TS

[0203] 38.214).

[0204] • In one example, the codebook may be a Rel.16 enhanced type II codebook (see 5.2.2.2.5, TS 38.214).

[0205] ● In one example, the codebook may be a Rel.16 enhanced port selection type II codebook (see 5.2.2.2.6, TS

[0206] 38.214).

[0207] ● In one example, the codebook may be a port selection type II codebook further enhanced in Rel.17 (see

[0208] 5.2.2.2.7, TS 38.214).

[0209] • In one example, the codebook is a new codebook for C-JT CSI reporting.

[0210] ○ In one example, the new codebook is a decoupled codebook comprising the following components:

[0211] ■Within TRP: According to TRP Rel.16 / 17 Type II codebook components, namely SD basis vectors (W1), FD basis vectors (Wf), W2 components (such as SCI, index of NZ coefficients and amplitude / phase of NZ coefficients).

[0212] ■ Between TRPs: used for common amplitude and common phase of each TRP.

[0213] ○ In one example, the new codebook is a joint codebook comprising the following components:

[0214] ■According to TRP SD basis vector (W1)

[0215] ■Single joint FD basis vector (Wf)

[0216] ■ A single joint W2 component (eg, SCI, index of NZ coefficients, and magnitude / phase of NZ coefficients).

[0217] Fig. 9 Two new codebooks 900 according to an embodiment of the present disclosure are shown. Fig. 9 The embodiment of two new codebooks 900 shown in FIG. 9 is for illustration only. Fig. 9 The scope of the present disclosure is not limited to any particular implementation of the two new codebooks 900 .

[0218] In one example, when the codebook is a legacy codebook (e.g., one of the Rel. 15 / 16 / 17 NR codebooks according to one of the above examples), the CSI report is based on a CSI resource set including one or more NZP CSI-RS resources, where each NZP CSI-RS resource includes CSI-RS antenna ports for all TRPs / RRHs, i.e., where P is the total number of antenna ports, and P r is the number of antenna ports associated with the rth TRP. In this case, the TRP corresponds to (or is mapped to or associated with) a set of antenna ports.

[0219] In one example, when the codebook is a new codebook (eg, one of the two new codebooks described above), the CSI report is based on a CSI resource set including one or more NZP CSI-RS resources.

[0220] ● In one example, each NZP CSI-RS resource includes CSI-RS antenna ports for all TRPs / RRHs. That is, where P is the total number of antenna ports, and P r is the number of antenna ports associated with the rth TRP. In this case, the TRP corresponds to (or is mapped to or associated with) a set of antenna ports.

[0221] ● In one example, each NZP CSI-RS resource corresponds to (or is mapped to or associated with) a TRP / RRH.

[0222] In this disclosure, we use N,N TRP ,N RRH Interchangeable for multiple TRP / RRHs.

[0223] In one embodiment, the UE is configured with an mTRP (or D-MIMO or C-JT) codebook via a higher layer parameter codebookType (which is based on the Rel-16 / 17 type-II codebook design) set to, for example, "typeII-r18-cjt". For example, the mTRP codebook has a triple-stage structure, which can be expressed as The component W 1 Used to report / indicate the spatial domain (SD) basis matrix including the SD basis vectors, component W f Used to report / indicate the frequency domain (FD) basis matrix including the FD basis vectors, and the components W 2 Used to report / indicate the coefficients corresponding to the SD and FD basis vectors.

[0224] The disclosure of the beam selection described below will be described below. 1 Not only for SD beam selection (e.g., DFT basis vector selection), but also for port selection (e.g., v i Select, where, for the i-th element, v i is a vector with 1s and 0s otherwise). Port selection and beam selection can be interchanged when appropriate.

[0225] Fig.10 An example distributed MIMO system 1000 is shown in which each TRP has a single antenna panel according to an embodiment of the present disclosure. Fig.10 The embodiment of the distributed MIMO system 1000 shown in FIG. 1 , wherein each TRP has a single antenna panel, is for illustration only. Fig.10 The scope of the present disclosure is not limited to any particular implementation of the distributed MIMO system 1000 in which each TRP has a single antenna panel.

[0226] like Fig.10 As shown, in one embodiment, each TRP has a single antenna panel. 1 It has a block diagonal structure consisting of X diagonal blocks, where 1 (co-polarization) or 2 (dual-polarization) diagonal blocks are associated with each TRP.

[0227] In one example, X=N TRPAssume a co-polarized (single polarized) antenna structure at each TRP. In one example, when N TRP =2, component W 1 Given by the following formula

[0228]

[0229] Among them, B 1 is the basis matrix of the first TRP, and B 2 is the basis matrix of the second TRP. In one example, Including L for the rth TRP r In one example, L r = L for all r values ​​(TRP - common L value), for example, L∈{2,3,4,6}. In one example, L r can be different across TRPs (TRP-specific L values), e.g., L r Can take values ​​from {2,3,4,6} (fixed or configured).

[0230] In one example, X=2N TRP A dual-polarization (cross-polarization) antenna structure at each TRP is assumed.

[0231] In one example, when N TRP =2, component W 1 Given by the following formula

[0232]

[0233] Among them, B 1 is the basis matrix of the first TRP and is common (identical) to the two polarizations corresponding to the first and second diagonal blocks, and B 2 is the basis matrix for the second TRP and is common (identical) to the two polarizations, which correspond to the third and fourth diagonal blocks. Typically, the (2r-1)th and 2rth diagonal blocks correspond to the two antenna polarizations of the rth TRP. In one example, Including L for the rth TRP r In one example, L r = L for all r values ​​(TRP - common L value), for example, L∈{2,3,4,6}. In one example, L r can be different across TRPs (TRP-specific L values), e.g., L r Can take values ​​from {2,3,4,6} (fixed or configured).

[0234] In one example, when N TRP=2, component W 1 Given by the following formula

[0235]

[0236] Among them, B 1 is the basis matrix of the first TRP and is common (identical) to the two polarizations corresponding to the first and third diagonal blocks, and B 2 is the basis matrix of the second TRP and is common (identical) to the two polarizations, which correspond to the second and fourth diagonal blocks. In general, the rth and (r+Nth TRP ) diagonal blocks correspond to the two antenna polarizations of the rth TRP. In one example, Including L for the rth TRP r In one example, L r = L for all r values ​​(TRP - common L value), for example, L∈{2,3,4,6}. In one example, L r can be different across TRPs (TRP-specific L values), e.g., L r Can take values ​​from {2,3,4,6} (fixed or configured).

[0237] In one example, when N TRP =2 components W 1 Given by the following formula

[0238]

[0239] Among them, B 1,1 and B 1,2 is the base matrix of the first antenna polarization and the second antenna polarization of the first TRP, which corresponds to the first diagonal block and the second diagonal block, and B 2,1 and B 2,2 is the basis matrix for the first antenna polarization and the second antenna polarization for the second TRP, which corresponds to the third diagonal block and the fourth diagonal block. Typically, the (2r-1)th and (2r)th diagonal blocks correspond to the two antenna polarizations of the rth TRP. In one example, Includes L for the pth polarization of the rth TRP r,p In one example, L r,p = L for all r and p values ​​(TRP-common and polarization-common L values), e.g., L∈{2,3,4,6}. In one example, L r,p =L r For all p values ​​(TRP specific and polarization common L values). In one example, L r,p =Lp For all r values ​​(TRP common and polarization specific L values). In one example, L r,p Can be different across TRPs (TRP specific and polarization specific L values).

[0240] In one example, when N TRP =2, component W 1 Given by the following formula

[0241]

[0242] Among them, B 1,1 and B 1,2 is a base matrix of the first antenna polarization and the second antenna polarization of the first TRP, corresponding to the first diagonal block and the third diagonal block, and B 2,1 and B 2,2 is the base matrix of the first antenna polarization and the second antenna polarization of the second TRP, which corresponds to the second diagonal block and the fourth diagonal block. TRP ) diagonal blocks correspond to the two antenna polarizations of the rth TRP. In one example, Includes L for the pth polarization of the rth TRP r,p In one example, L r,p = L for all r and p values ​​(TRP-common and polarization-common L values), e.g., L∈{2,3,4,6}. In one example, L r,p =L r For all p values ​​(TRP specific and polarization common L values). In one example, L r,p =L p For all r values ​​(TRP common and polarization specific L values). In one example, L r,p Can be different across TRPs (TRP specific and polarization specific L values).

[0243] In one example, For the co-polarization (single polarization) antenna structure of the rth TRP, a r =1, and for the dual-polarization (cross-polarization) antenna structure of the rth TRP, a r =2.

[0244] In one example, when N TRP =2, component W 1 Given by the following formula

[0245]

[0246] Among them, B 1is the basis matrix of the first TRP, and B 2 is the basis matrix of the second TRP and is common (identical) for the two polarizations, which correspond to the second and third diagonal blocks.

[0247] In one example, when N TRP =2, component W 1 Given by the following formula

[0248]

[0249] Among them, B 1 is the basis matrix of the first TRP, and B 2,1 and B 2,2 It is the base matrix of the first antenna polarization and the second antenna polarization of the second TRP, which corresponds to the second diagonal block and the third diagonal block.

[0250] Fig.11 An example distributed MIMO system 1100 is shown in which each TRP has multiple antenna panels according to an embodiment of the present disclosure. Fig.11 The embodiment of the distributed MIMO system 1100 shown in FIG. 1 , wherein each TRP has multiple antenna panels, is for illustration only. Fig.11 The scope of the present disclosure is not limited to any particular implementation of the distributed MIMO system 1100 in which each TRP has multiple antenna panels.

[0251] like Fig.11 As shown, in one embodiment, each TRP has multiple antenna panels. 1 Having a block diagonal structure comprising X diagonal blocks, where N g,r (co-polarization) or 2N g,r (Dual polarization) diagonal blocks with N g,r The rth TRP of the panel is associated, and for all values ​​of r, N g,r >1. Note: For Fig.11 The two TRPs in N g,r =2.

[0252] In this case (of multiple panels at TRP), by 1 The example in this article can be extended in a straightforward way by adding diagonal blocks corresponding to multiple panels.

[0253] Fig.12 An example distributed MIMO system 1200 is shown, where each TRP may have a single panel or may have multiple panels, according to an embodiment of the present disclosure. Fig.12The embodiment of the distributed MIMO system 1200 shown in FIG. 1 , wherein each TRP may have a single panel or may have multiple panels, is for illustration only. Fig.12 The scope of the present disclosure is not limited to any particular implementation of the distributed MIMO system 1200 in which each TRP may have a single panel or have multiple panels.

[0254] like Fig.12 As shown, in one embodiment, each TRP may have a single antenna panel or multiple antenna panels (see Fig.12 ). Component W 1 Having a block diagonal structure comprising X diagonal blocks, where N g,r (co-polarization) or 2N g,r (Dual polarization) diagonal blocks with N g,r The rth TRP of the panel, and when the rth TRP has a single panel N g,r = 1, and when the rth TRP has multiple panels N g,r >1.

[0255] In this case (of multiple panels at TRP), it is possible to 1 Adding diagonal blocks corresponding to multiple panels in extends the examples described herein in a straightforward manner.

[0256] In one embodiment, the component W 1 The basis matrix of the diagonal blocks of has columns selected from the set of oversampled 2D DFT vectors. When the antenna port layout is the same across TRPs, for a given antenna port layout (N 1 ,N 2 ), and the oversampling factor for two dimensions (O 1 ,O 2 ), DFT vector v l,m It can be expressed as follows.

[0257]

[0258] Where l∈{0,1,…,O 1 N 1 -1} and m∈{0,1,…,O 2 N 2 -1}.

[0259] When the antenna port layout can be different across TRPs, for a given antenna port layout (N 1,r ,N 2,r ), and the oversampling factor (O) associated with the rth TRP 1,r ,O 2,r ), DFT vector It can be expressed as follows.

[0260]

[0261] Among them l r ∈{0,1,…,O 1,r N 1,r -1} and m r ∈{0,1,…,O 2,r N 2,r -1}.

[0262] In one example, the oversampling factor is common to the TRPs and therefore remains the same across TRPs. 1,r =O 1 =O 2,r =O 2 =4. In one example, the oversampling factor is TRP-specific and thus independent for each TRP. 1,r =O 2,r =x and x is selected from {2,4,8} (fixed or configured).

[0263] In one embodiment, the component W 1 The diagonal blocks of the basis matrix have columns selected from the set of port selection vectors. When the antenna port layout is the same across TRPs, for a given number of CSI-RS ports P CSI-RS , port selection vector v m is in the element P that contains the value 1 and is zero elsewhere (where the first element is element 0) CSI- / 2-element column vector.

[0264] When the antenna port layout can be different across TRPs, for a given number of CSI-RS ports P CS,r , port selection vector is in the element P that contains the value 1 and is zero elsewhere (where the first element is element 0) -SI-RS,r / 2-element column vector.

[0265] In one embodiment, each TRP may have a single antenna panel or multiple antenna panels (see Fig.12 ). Component W 1 Having a block diagonal structure comprising X=2 diagonal blocks, where N g,r (co-polarization) or 2N g,r (Dual polarization) diagonal blocks with N g,r The rth TRP of the panel is associated with, and when the rth TRP has a single panel N g,r = 1, and when the rth TRP has multiple panels N g,r >1.

[0266] In the following, the term polarization is used to refer to a group / subset of CSI-RS ports. For example, the first antenna polarization corresponds to the first group / subset of CSI-RS ports. and the second antenna polarization corresponds to the second group / subset of CSI-RS ports Here, P CSIRS is the total number of CSI-RS ports for which the CSI report is configured. In one example, X=3000 is the first CSI-RS port index.

[0267] Hereinafter, TRP may refer to a CSI-RS resource (configured for channel measurement), or a group of CSI-RS ports (including multiple groups of CSI-RS ports) within a CSI-RS resource.

[0268] In one embodiment, the component W 1 It is TRP common port selection (or TRP common SD based beam selection), that is, the same set of ports is selected for all TRPs.

[0269] In one example, the component W 1 is TRP-common, polarization-common, and layer-common (i.e., the same set of CSI-RS ports is selected / reported for all TRPs, for both antenna polarizations, and for all layers). 1 It can be expressed as:

[0270]

[0271] Where V is the number of layers, It is Layer W 1 , B includes a common set of port selection vectors for all TRPs, dual-polarized antenna ports, and layers. In one example, when N TRP =2, for dual polarization case W 1 =diag(B,B,B,B), where diag(A,B,C,…) is a block diagonal matrix consisting of the A,B,C,… matrices in a block diagonal fashion. In one example, B=[b 0 ,b 1 ,…,b L-1 ], where L is the number of port selection vectors. When the antenna port layout is the same across TRPs and the number of CSI-RS ports per TRP is P CSI-R (i.e., P CSI-,total =N TRP P CSI-RS ), across TRP and layers from Select the same L port (assuming dual polarization). In this case, with cardinality (payload) An indicator of one bit is needed to indicate the selected L-port for all layers, and this indicator is reported in the CSI report, for example as a PMI component.

[0272] In one example, the component W 1 is TRP-common, polarization-common, and layer-specific (i.e., for each layer, the same set of CSI-RS ports is selected / reported for all TRPs and for both antenna polarizations). 1 It can be expressed as:

[0273]

[0274] Where V is the number of layers, It is Layer W 1 , A common set of port selection vectors for all TRPs and dual-polarized antenna ports is included. In one example, Where L is the number of port selection vectors. When the antenna port layout is the same across TRPs and the number of CSI-RS ports per TRP is P CSI-RS (i.e., P CSI-R,total =N TRP P CSI-RS ), for each layer across TRP from Select the same L port (assuming dual polarization). In this case, as an example, with the base (payload) An indicator is needed to indicate the selected L port for each layer, and each indicator is reported in the CSI report, for example as a PMI component.

[0275] In another example, L depends on the layer (index ).in this case, And thus, in one example, with the cardinality (payload) The indicator needs to indicate that for each layer Selected port.

[0276] In one example, the component W 1 is TRP-common, polarization-specific, and layer-common (i.e., for each polarization, the same set of CSI-RS ports is selected / reported for all TRPs and all layers). 1 It can be expressed as:

[0277]

[0278] Where V is the number of layers, It is Layer W 1 , B 0,k The common set of port selection vectors for all TRPs and layers for the k-th polarization (where k=1,2). In one example, B 0,k =[b 0,k ,b 1,k ,…,b L-1,k ], where L is the number of port selection vectors for the k-th polarization.

[0279] When the antenna port layout is the same across TRPs and the number of CSI-RS ports per TRP is P CSI-R (i.e., P CSI-,total =N TRP P CSI-RS ), for each polarization, across TRP and layer from Select the same L port (assuming dual polarization case). All TRPs and layer selected L-ports for each polarization need to be indicated and each indicator is reported in the CSI report, for example as a PMI component.

[0280] In another example, L depends on the polarization (index k). In this case, And thus, in one example, with the cardinality (payload) An indicator is needed to indicate the selected L for each polarization k k port.

[0281] In one example, the component W 1 is TRP-common, polarization-specific, and layer-specific (i.e., for each polarization, for each layer, the same set of CSI-RS ports is selected / reported for all TRPs). 1 It can be expressed as:

[0282]

[0283] Where V is the number of layers, It is Layer W 1 , A common set of port selection vectors for all TRPs of each layer for the k-th polarization (where k=1,2). In one example, where L is the layer for the kth polarization The number of port selection vectors.

[0284] When the antenna port layout is the same across TRPs and the number of CSI-RS ports per TRP is PCSI-RS (i.e., P CSI-RS,total =N TRP P CS ), for each layer of each polarization, across TRP from Select the same L port (assuming dual polarization). In this case, as an example, with the base (payload) An indicator needs to indicate the L-port selected for each layer of each polarization, for all TRPs, and each indicator is reported in the CSI report, for example as a PMI component.

[0285] In another example, L depends on the polarization k and / or layer In one example, And thus, in one example, with the cardinality (payload) An indicator is needed to indicate the selected L for each polarization k k In another example, And thus, in one example, with the cardinality (payload) The indicator needs to indicate that for each layer of choice In another example, And thus, in one example, with the cardinality (payload) The indicator needs to indicate that for each layer of each polarization k Selected port.

[0286] In one embodiment, the component W 1 It is TRP-specific port selection (or TRP-specific SD-based beam selection), that is, an independent set of ports is selected / reported for each TRP.

[0287] In the present disclosure, TRP index i can be determined based on CSI-RS port number, CSI-RS resource ID. In another example, TRP index i can be determined based on RSRP / RSRQ / SINR (which can be based on UE measurement, for example), and can be configured by NW or reported by UE.

[0288] In one example, the component W 1 is TRP-specific, polarization-common, and layer-common (i.e., for each TRP, a common set of CSI-RS ports is selected / reported for all layers and for both antenna polarizations). 1 It can be expressed as:

[0289]

[0290] Where V is the number of layers, It is Layer W 1 , B i includes an independent set of port selection vectors for TRPi but the set is the same across polarizations and layers. In one example, when N for the dual polarization case TRP =2,W 1 =diag(B 1 ,B 1 ,B 2 ,B 2 ), where diag(A,B,C,…) is a block diagonal matrix composed of the matrices A,B,C,… in a block diagonal fashion. In one example, B i =[b i,0 ,b i,1 ,…,b i,L-1 ], where L is the number of port selection vectors for TRPi. When the antenna port layout is the same across TRPs and the number of CSI-RS ports per TRP is P CSI-R (i.e., P CSI-RS,total =N TRP P CSI-RS ), across polarization and layers from Select the same L port (assuming dual polarization). In this case, with the base (payload) An indicator of L needs to indicate the L ports selected for all layers and polarizations for each TRP, and each indicator is reported in the CSI report. In another example, L depends on the TRP.

[0291] The reporting of (indexes to) the port selection vectors of all TRPs may be via one joint indicator, or via multiple (separate) indicators, one for each TRP.

[0292] In one example, B i Including L i Port selection vector (the number of TRP-specific port selection vectors), i.e., Where L i is the number of port selection vectors of TRPi. In one example, L 1 =2,L 2 =4 and so on.

[0293] ●In one example, L i s is selected from For example, or

[0294] ● In one example, for each TRPi's L i Selected from For example, etc.

[0295] ●In another example, Select from the set of joint indicators For example, when N TRP =2,

[0296] In one example, L i s is configured by the NW via RRC, MAC-CE and / or DCI. In one example, some L i s is configured, and the others are fixed or determined based on configured values. In one example, the UE determines and reports L 1 and / or L 2 etc.

[0297] In one example, B 1 and B 2 Including L 1 port select vector, and B 3 and B 4 Including L 2 Port selection vector (the number of port selection vectors for a particular TRP pair), i.e., for i∈{1,2}, And for i∈{3,4}, In one example, (L 1 ,L 2 )=(4,2),

[0298] ●In one example, L 1 and L 2 Selected from For example, or

[0299] ●In one example, L i Selected For example,

[0300] ●In another example, (L 1 ,L 2 ) is selected from the set for the joint indicator For example,

[0301] In one example, L i s is configured by the NW via RRC, MAC-CE and / or DCI. In one example, L iOne of the Ls is configured, and the other is fixed or determined based on the configured value. In one example, the UE determines and reports L 1 and / or L 2 .

[0302] In one example, when N TRP ≤x, one L value is used for all TRPs, and when N TRP >x, two L values ​​are used, where: x is the threshold, which can be fixed (e.g., 2) or configured.

[0303] For example, if x is fixed to 2, we can have

[0304] When N TRP =2, for i=1,2, B i =[b i,0 ,b i,1 ,…,b i,L-1 ].

[0305] When N TRP =3 or 4, for i=1,2, For i=3,4,

[0306] In one example, (L 1 ,L 2 )=(2,4),(3,4) or another pair of values.

[0307] In one example, L 1 and L 2 Selected from For example, or

[0308] In one example, L i Selected from For example,

[0309] In another example, (L 1 ,L 2 ) is selected from the set for the joint indicator For example,

[0310] In one example, L i s is configured by the NW via RRC, MAC-CE and / or DCI. In one example, L iOne of the Ls is configured, and the other is fixed or determined based on the configured value. In one example, the UE determines and reports L 1 and / or L 2 .

[0311] In one example, the total number of port selection vectors for all TRPs is L sum .

[0312] In one example, L sum Configured by NW via RRC, MAC-CE and / or DCI. In another example, L sum is fixed, for example, L sum =4. In one example, L sum Determined and reported by the UE.

[0313] In one example, L sum Selected from the collection For example,

[0314] In one example, when N TRP ≤x,L sum is the first value, and when N TRP >x,L sum is the second value, where x is a threshold value, which may be fixed (eg, 2) or configured. In one example, (first value, second value) is configured or fixed.

[0315] In one example, L i Values ​​are layer-common and rank-common.

[0316] In one example, the L' value is layer-common and rank-common.

[0317] In one example, L i Values ​​are layer-specific and rank-common.

[0318] In one example, the L' value is layer-specific and rank-common.

[0319] In one example, L i Values ​​are layer-common and rank-specific.

[0320] In one example, the L' value is layer-common and rank-specific.

[0321] In one example, L i Values ​​are layer-specific and rank-specific.

[0322] In one example, the L' value is layer-specific and rank-specific.

[0323] In the above example, TRP index i can be determined based on CSI-RS port number, CSI-RS resource ID. In another example, TRP index i can be determined based on RSRP / RSRQ / SINR (which can be based on UE measurement, for example), and can be configured by NW or reported by UE.

[0324] In one example, the component W 1 is TRP-specific, polarization-common, and layer-specific (i.e., for each TRP and for each layer, a common set of CSI-RS ports is selected / reported for both antenna polarizations). 1 It can be expressed as:

[0325]

[0326] Where V is the number of layers, It is Layer W 1 , Included for layer An independent set of port selection vectors for TRPi is used, but the set is the same across polarizations. In one example, Where L is the layer When the antenna port layout is the same across TRPs and the number of CSI-RS ports per TRP is P CSI-RS (i.e., P CSI-RS,total =N TRP P CSI- ), cross-polarization from Select the same L port (assuming dual polarization). In this case, with the base (payload) The indicator needs to indicate that for each layer The L ports of all polarization selections for each TRPi are selected and each indicator is reported in the CSI report. In another example, L depends on the TRP and / or layer.

[0327] In one or more examples, L and related parameters can be extended according to one or more examples described herein.

[0328] In one example, the component W 1 is TRP-specific, polarization-specific, and layer-common (i.e., for each TRP and for each polarization, a common set of CSI-RS ports is selected / reported for all layers). 1 It can be expressed as:

[0329]

[0330] Where V is the number of layers, It is Layer W 1 , B i,k includes an independent set of port selection vectors for TRPi of polarization k, but the set is the same across layers. In one example, B i,k =[b i,0,k ,b i,1,k ,…,b i,L-1,k ], where L is the number of port selection vectors for TRPi for polarization k. When the antenna port layout is the same across TRPs and the number of CSI-RS ports per TRP is P CSI-RS (i.e., P CSI-RS,total =N TRP P CSI-RS ), cross-layer Select the same L port (assuming dual polarization). In this case, with the base (payload) An indicator of needs to indicate the L ports selected for all layers of each TRPi for each polarization k, and each indicator is reported in the CSI report. In another example, L depends on TRP and / or polarization.

[0331] In one or more examples, L and related parameters can be extended according to one or more examples described herein.

[0332] In one example, the component W 1 is TRP-specific, polarization-specific, and layer-specific (i.e., for each TRP, for each polarization, and for each layer, a set of CSI-RS ports is selected / reported). 1 It can be expressed as:

[0333]

[0334] Where V is the number of layers, It is Layer W 1 , Included for layer A set of independent port selection vectors for TRPi for polarization k. In one example, Where L is the layer The number of port selection vectors for TRPi for polarization k. When the antenna port layout is the same across TRPs and the number of CSI-RS ports per TRP is P CSI- (i.e., P CSI-R,total =N TRP P CSI-R ), for TRP / polarization / layer, from The L ports are selected independently (assuming dual polarization). In this case, with the base (payload) The indicator needs to indicate that for each layer For each polarization k of , for each TRPi selected L ports, and each indicator is reported in the CSI report. In another example, L depends on TRP, polarization and / or layer.

[0335] In one or more examples, L and related parameters can be extended according to one or more examples described herein.

[0336] In one embodiment, the component W 1 The total number of selected ports is L sum Under the constraint of is TRP-specific port selection (or TRP-specific SD basic beam selection). In this embodiment, the total number of selected ports is L sum Under the constraint of,B i Includes L for TRPi i Port selection vector, where L sum =∑ i L i .

[0337] In one example, L sum Configured by NW via RRC, MAC-CE and / or DCI. In another example, L sum is fixed, for example, L sum =4. In one example, L sum Determined and reported by the UE.

[0338] In one example, L sum Selected from the collection For example,

[0339] In one example, when N TRP ≤x,L sum is the first value, and when N TRP >x,L sum is the second value, where x is a threshold value, which may be fixed (eg, 2) or configured. In one example, (first value, second value) is configured or fixed.

[0340] In one example, the component W 1 It is TRP-specific, polarization-common and layer-common.

[0341] In one example, the component W 1 is TRP-specific, polarization-common, and layer-specific. In this case, L sum Can depend on layer For example, In another example, L sum Fixed for all layers.

[0342] In one example, the component W 1 It is TRP-specific, polarization-specific and layer-common. sum can depend on the polarization k, for example, L sum (k). In another example, L sum Fixed for all polarizations.

[0343] In one example, the component W 1 is TRP-specific, polarization-specific, and layer-specific. sum Can depend on layer and / or polarization k, for example, In another example, L sum is fixed for all layers and polarizations.

[0344] In one embodiment, the component W 1 It is TRP pair common port selection (or TRP pair common SD basis beam selection), that is, the same set of ports is selected for each TRP pair.

[0345] In one example, the component W 1 is common to TRP pairs, polarizations, and layers. For example, when N TRP =4, there are two TRP pairs. In this case, E 1 It can be expressed as Among them B 12 =[b 12,0 ,…,b 12,L-1 ] and B 34 =[b 34,0 ,…,b 34,L-1 ] are the port selection vectors for the TRP pairs (i.e., TRP 1 and 2, TRP 3 and 4), respectively. In this case, An indicator is needed to indicate the selected L port for each TRP pair, and each indicator is used for CSI reporting.

[0346] In one example, the component W 1 There are TRP pairs that are common, polarization common, and layer specific.

[0347] In one example, the component W 1 It is TRP pair common, polarization specific and layer common.

[0348] In one example, the component W 1 There are TRP pairs that are common, polarization specific, and layer specific.

[0349] In one embodiment, the component W 1A port selection vector that includes a subset of TRPs.

[0350] In one embodiment, for a subset of TRPs, the component W 1 It is TRP common port selection (or TRP common SD based beam selection), that is, the same set of ports is selected for all TRPs.

[0351] In one example, the component W 1 It is TRP common, polarization common and layer common.

[0352] In one example, the component W 1 It is TRP-common, polarization-common and layer-specific.

[0353] In one example, the component W 1 It is TRP-common, polarization-specific and layer-common.

[0354] In one example, the component W 1 It is TRP-common, polarization-specific and layer-specific.

[0355] In one embodiment, for a subset of TRPs, the component W 1 It is TRP-specific port selection (or TRP-specific SD-based beam selection), that is, an independent set of ports is selected for each TRP.

[0356] In one example, the component W 1 It is TRP-specific, polarization-common and layer-common.

[0357] In one example, the component W 1 It is TRP-specific, polarization-common and layer-specific.

[0358] In one example, the component W 1 It is TRP-specific, polarization-specific and layer-common.

[0359] In one example, the component W 1 It is TRP-specific, polarization-specific and layer-specific.

[0360] Similar to the Rel-17 Type-II port selection codebook, the number of selected ports L can be parameterized by the number of CSI-RS ports by α. For example, L = 2K 1 and K 1 =αP CSIRS , where α takes values ​​in {1 / 4, 1 / 2, 3 / 4, 1}.

[0361] In one embodiment, component W f According to at least one of the following examples.

[0362] In one example, the component W f is TRP common and layer common, that is, a common W f Reported for all TRPs and all layers (when number of layers or rank > 1).

[0363] In one example, the component W f is TRP-common and layer-specific, i.e., for each layer l∈{1,…,v} where v is the rank value or the number of layers, a common W f It is reported for all TRPs.

[0364] In one example, the component W f is TRP-specific and layer-common, i.e., for each TRPr∈{1,…,N TRP}, a public W f For all layers report.

[0365] In one example, the component W f is TRP-specific and layer-specific, i.e., for each TRP, r∈{1,…,N TRP}, and for each layer l∈{1,…,v}, a W f Be reported.

[0366] In one example, the component W f is common to the TRP pair and to the layer, i.e., a common W f Reported for each TRP pair and all layers (when number of layers or rank > 1).

[0367] In one example, the component W f is common to the TRP and layer-specific, i.e., for each layer, l∈{1,…,υ}, where υ is the rank value or the number of layers, a common W f is reported for each TRP pair.

[0368] In one embodiment, let W f Includes M with a given rank value υ υ Column. Value M υ Can be fixed (e.g., 1 or 2) (or configured via higher layer (RRC) signaling (similar to R16 enhanced type II codebook) or reported by the UE as part of the CSI report). υ And some other parameters (e.g., α, β, such as Rel-17 type IICB) can be jointly parameterized, and the joint parameters can be configured by NW. υ According to at least one of the following examples. In one example, when W 1 Including port selection vector M v∈{1,2}, i.e., when the UE is configured with a port selection type II codebook, as described in the present disclosure. In one example, when W 1 When including DFT basis vectors, That is, when the UE is configured with a conventional type II codebook, as described in this disclosure, and as described in TS 38.214 section 5.2.2.2.5.

[0369] In one example, the value M v is TRP-common, layer-common, and RI-common. The same value M v For N TRP , all values ​​of v and layers = 1,…,v are used commonly.

[0370] In one example, the value M υ is TRP-common, layer-common, and RI-specific. For each RI value v, the same value M v For N TRP All values ​​of and layers = 1,…,υ are used commonly.

[0371] In one example, the value M υ is TRP-common, layer-specific, and RI-common. For each layer = 1,…,v, the same value M υ For N TRP All values ​​of and υ are used publicly.

[0372] In one example, the value M v is TRP-specific, layer-common, and RI-common. For each TRPr∈{1,…,N TRP}, the same value M v For all values ​​of v and layers = 1,…, v is used commonly.

[0373] In one example, the value M v It is TRP-common, layer-specific and RI-specific.

[0374] In one example, the value < v It is TRP-specific, layer-specific and RI-common.

[0375] In one example, the value < v It is TRP-specific, layer-common and RI-specific.

[0376] In one example, the value M v It is TRP-specific, layer-specific and RI-specific.

[0377] In one example, the value M v It is common to TRP, layers and RI.

[0378] In one example, the value M υ It is TRP-common, layer-common and RI-specific.

[0379] In one example, the value M υ It is common to TRP, layer-specific and RI-common.

[0380] In one example, the value M υ There are TRPs for common, layer-specific and RI-specific.

[0381] In one embodiment, W f The columns of are selected from the set of oversampled DFT vectors. When the antenna port layout is the same across TRPs, for a given N 3 and the oversampling factor O 3 , DFT vector y f It can be expressed as follows.

[0382]

[0383] where f∈{0,1,…,O 3 N 3 -1}.

[0384] When N 3 The value may be different across TRPs, e.g., for the rth TRP, the DFT vector It can be expressed as follows.

[0385]

[0386] Among them, f r ∈{0,1,…,O 3,r N 3,r -1}.

[0387] In one example, the oversampling factor is common to the TRPs and therefore remains the same across TRPs. 3,r =O 3 In one example, the oversampling factor is TRP-specific and thus independent for each TRP. 3,r = x and x is selected from {1, 2, 4, 8} (fixed or configured). In one example, the oversampling factor = 1. Then, the DFT vector y f It can be expressed as follows.

[0388]

[0389] In one embodiment, W f The columns of are selected from the set of port selection vectors. 3The value is the same across TRPs when, for a given N 3 Value, port selection vector v m is an N that contains the value 1 in its elements and is zero elsewhere (where the first element is element 0) 3 Element column vector (mmodN 3 ).

[0390] When N 3 The values ​​are different across TRPs when, for a given N 3,r Value, port selection vector is an N that contains the value 1 in its elements and is zero elsewhere (where the first element is element 0) 3 Element column vector (m r modN 3 ).

[0391] In one embodiment, for W f The quantitative FD basis (or FD basis vectors) may be restricted to a single window / set with a size N configured to the UE.

[0392] In one example, the FD basis (or FD basis vectors) in the window is continuous from the orthogonal DFT matrix.

[0393] In one example, the FD basis (or FD basis vectors) in the set can be continuous / non-continuous and freely selected by the NW from the orthogonal DFT matrix.

[0394] In this disclosure, the term "polarization" is used to indicate a CSI-RS antenna port group. For example, the first polarization may correspond to a CSI-RS antenna port And the second polarization may correspond to the CSI-RS antenna port

[0395] The coefficient matrix W across all TRPs 2 Can be based on each TRPW 2.r Matrix to determine, where: r = 1, ..., N TRP .For example,

[0396] When W f is TRP common (a W f is common to all TRPs), then is the coefficient matrix across all TRPs.

[0397] When W f is TRP specific (a W f,r For each TRPr), then is the coefficient matrix across all TRPs.

[0398] In one embodiment, the strongest coefficient indicator (SCI) is used to indicate the component W across all TRPs. 2 The position (or index) of the strongest coefficient of the SCI (the other coefficients are normalized by the coefficient of the SCI). In one example, the SCI is common to all layers, i.e., one SCI is reported for all layers. In another example, the SCI is layer-specific, i.e., one SCI is reported for each layer value. The coefficient corresponding to the SCI is set to 1 (and therefore not reported).

[0399] The payload of the SCI can be based on one of the following examples.

[0400] ●In one example, the payload is Bit.

[0401] ○ In one example, X=2L (eg, when the LSD basis vectors are united across TRPs).

[0402] ○ In one example, (For example, when the SD basis vectors are separate for each TRP, and each TRP can have a different number of SD basis vectors).

[0403] ○ In one example, X = 2N TRP L (e.g., when the SD basis vectors are separate for each TRP and each TRP has the same number of SD basis vectors).

[0404] ○ In one example, X = 2LM or 2LM v (For example, when LSD basis vectors and FD basis vectors are combined across TRPs).

[0405] ○ In one example, (For example, when the SD basis vectors and FD basis vectors are separate for each TRP, and each TRP can have a different number of SD / FD basis vectors).

[0406] ○ In one example,

[0407] ○ In one example,

[0408] ○ In one example,

[0409] ○ In one example, X = 2N TRP LM (e.g., when the SD / FD basis vectors are separate for each TRP and each TRP has the same number of SD / FD basis vectors).

[0410] ○ In one example, X = β2LM or β2LMv (For example, when LSD basis vectors and FD basis vectors are combined across TRPs).

[0411] ○ In one example, (For example, when the SD basis vectors and FD basis vectors are separate for each TRP, and each TRP can have a different number of SD / FD basis vectors).

[0412] ○ In one example,

[0413] ○ In one example,

[0414] ○ In one example,

[0415] ○ In one example, X = 2N TRP βLM (e.g., when the SD / FD basis vectors are separate for each TRP and each TRP has the same number of SD / FD basis vectors).

[0416] ●In one example, the payload is Bits, of which bits are used to indicate the index of the strongest coefficient, and The bit is used to indicate the index of the TRP to which the strongest coefficient belongs (e.g., the strongest TRP).

[0417] ○ In one example, X=2L and Y=N TRP .

[0418] ○ In one example, X = 2L r and Y = N TRP .

[0419] ○ In one example, X = 2LM and Y = N TRP .

[0420] ○ In one example, X = 2L r M r and Y = N TRP .

[0421] ○ In one example, X = β2LM and Y = N TRP .

[0422] ○ In one example, X = β2L r M r and Y = N TRP .

[0423] Here, the SCI can implicitly indicate the strongest TRP. That is, the TRP index r to which the strongest coefficient belongs * It also has the highest TRP.

[0424] In one example, the strongest TRP described in all embodiments / examples of the present disclosure may be replaced by a reference TRP. In one example, the reference TRP may be configured via RRC, MAC-CE, or DCI. In one example, the reference TRP may be fixed or determined by a predefined rule. In one example, the reference TRP may be determined by the UE and reported as part of the CSI.

[0425] In one example, the SCI includes a pair of indicators (x, y), where indicator x indicates the index of the strongest coefficient and indicator y indicates the index of the TRP to which the strongest coefficient belongs (eg, y is the strongest TRP indicator).

[0426] In one example, there are two separate indicators (x, y), where the SCI corresponds to x and the strongest TRP indicator corresponds to y.

[0427] In one example, the indicator payload y is Bit.

[0428] In one example, the indicator payload y is Bit.

[0429] • In one example, X=2L.

[0430] In one example, X = 2L r .

[0431] • In one example, X=2LM.

[0432] In one example, X = 2L r M r .

[0433] • In one example, X = β2LM.

[0434] ● In one example, X = β2L r M r .

[0435] In the Rel-16 / 17 Type-II codebook, for W 2 The amplitude quantization scheme is differential, that is, each amplitude value is calculated as p (1) p (2) , where p (1) is the reference amplitude value, and p (2) is the (differential) coefficient amplitude value. In [REF 9], there are two reference amplitude values for layers l=1,…,v, where a reference value corresponding to SCI is set to 1 (and thus not reported, i.e., and ), and other reference values ​​for other polarizations of coefficients corresponding to the SCI are selected from the 4-bit amplitude codebook in Table 5.2.2.2.5-2 in [REF 9] and reported (i.e., indicator is reported). For p (2) , please refer to [REF 9] for details.

[0436] In the mTRP codebook disclosed in the present invention, for N TRP ≥2, (about p (1) ) The number of reference amplitude values ​​may be based on at least one of the following examples. is TRPr∈{1,…,N TRP} and two reference amplitude values ​​of layer l=1,…,v. N≤N TRP It may be configured via RRC, MAC-CE or DCI, or may be determined and reported by the UE, or may be determined implicitly, where N is N TRP The number of (selected) cooperating TRPs in a TRP.

[0437] In one example, for each layer l (layer specific), the reference amplitude value (N ref ) is fixed regardless of N TRP (or N). For example, N ref = 2. Therefore, there are a total of 2v reference amplitude values ​​for the υ layer.

[0438] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to SCI is set to 1 for the polarization of SCI for all TRPs That is, for all values ​​of r, and other reference values ​​for other polarizations of all TRPs (x≠x * ) is selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits per layer.

[0439] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI with the strongest TRP That is, for the r associated with the strongest TRP * value, and other reference values ​​for other polarizations of the strongest TRP (x≠x * ) is selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits per layer.

[0440] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI with the strongest TRP That is, for the r associated with the strongest TRP * value, and other reference values ​​of the residual coefficients that are independent of the polarization of the SCI of the strongest TRP (i.e., Selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits per layer.

[0441] ● In one example, for each layer l, for the polarization of SCI for all TRPs, one reference value corresponding to SCI is set to 1 (and therefore not reported). For each layer l, for the other polarization of SCI, the second strongest coefficient indicator is used to indicate W across all TRPs 2 The position (or index) of the strongest coefficient (i.e., for the other polarizations of SCI, in W 2 The other reference value corresponding to the second SCI is selected from an x-bit amplitude codebook (e.g., x=4) and reported. This reference value is used for the other polarizations of the SCI for all TRPs.

[0442] In one example, the reference amplitude value (N ref ) can be fixed regardless of N TRP (or N) value. For example, N ref =2 and the total number of reference amplitude values ​​for v layers is 2 (layer-common).

[0443] ● In one example, for all layers, a reference value corresponding to SCI is set to 1 for the polarization of SCI for all TRPs Right now, Applies to all values ​​of r and for all other polarizations of TRP (x≠x * ) are selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits for all layers.

[0444] ● In one example, similar to the Rel-16 / 17 Type-II codebook, for all layers l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI with the strongest TRP Right now, For the r associated with the strongest TRP * value, and for the other polarizations with the strongest TRP (x≠x * ) are selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits for all layers.

[0445] ● In one example, similar to the Rel-16 / 17 Type-II codebook, for all layers l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI with the strongest TRP Right now, For r associated with the strongest TRP * values, and other reference values ​​of the residual coefficients that are independent of the polarization of the SCI of the strongest TRP (i.e., is selected from a 4-bit amplitude codebook and reported. Thus, the total payload is 4 bits for all layers.

[0446] ● In one example, for all layers, for one polarization of SCI for all TRPs, one reference value corresponding to SCI is set to 1 (and therefore not reported). For all layers, for the other polarization of SCI, the second strongest coefficient indicator is used to indicate W across all TRPs 2 The position (or index) of the strongest coefficient (i.e., for the other polarizations of SCI, in W 2 The other reference value corresponding to the second SCI is selected from an x-bit amplitude codebook (e.g., x=4) and reported. This reference value is used for the other polarizations of the SCI for all TRPs.

[0447] In one example, for each layer l (layer specific), the number of reference amplitude values ​​(N ref ) is fixed regardless of N TRP (or N). For example, N ref = 3. Therefore, there are a total of 3v reference amplitude values ​​for the v layer.

[0448] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI with the strongest TRP Right now, For r associated with the strongest TRP * value, and other polarizations (x≠x * ) are selected from a 4-bit amplitude codebook and reported, and other reference values ​​for the remaining coefficients that are independent of the SCI of the strongest TRP are selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 8 bits per layer.

[0449] In one example, the number of reference amplitude values ​​(N ref ) can be fixed regardless of N TRP (or N). For example, N ref =3, and the total number of reference amplitude values ​​for v layers is 3 (layer-common).

[0450] ● In one example, similar to the Rel-16 / 17 Type II codebook, for all layers, one reference value corresponding to the SCI is set to 1 for the polarization of the SCI with the strongest TRP Right now, For r associated with the strongest TRP * value, and with the other polarizations of the strongest TRP (x≠x * ) are selected and reported from a 4-bit amplitude codebook, and other reference values ​​for the remaining coefficients that are independent of the SCI of the strongest TRP are selected and reported from a 4-bit amplitude codebook. Therefore, the total payload is 8 bits for all layers.

[0451] In one example, for each layer l (layer specific), the number of reference amplitude values ​​(N ref ) is fixed regardless of N TRP (or N). For example, N ref = 4. Therefore, there are a total of 4v reference amplitude values ​​for the v layer.

[0452] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI with the strongest TRP Right now, For r associated with the strongest TRP * value, and with the other polarizations of the strongest TRP (x≠x * ) is selected from a 4-bit amplitude codebook and reported, a third reference value for the remaining coefficients of the TRP not associated with the strongest TRP for the polarization of SCI is selected from a 4-bit amplitude codebook and reported, and a fourth reference value for the remaining coefficients of the TRP not associated with the strongest TRP for the other polarizations of SCI is selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 12 bits per layer.

[0453] In one example, the reference amplitude value (N ref ) can be fixed regardless of N TRP (or N). For example, N ref =4, and the total number of reference amplitude values ​​for the υ layer is 4 (layer-common).

[0454] ● In one example, similar to the Rel-16 / 17 Type II codebook, for all layers, one reference value corresponding to the SCI is set to 1 for the polarization of the SCI with the strongest TRP Right now, For r associated with the strongest TRP * value, and with the other polarizations of the strongest TRP (x≠x* ) is selected from a 4-bit amplitude codebook and reported, a third reference value for the remaining coefficients of the TRP not associated with the strongest TRP for the polarization of the SCI is selected from a 4-bit amplitude codebook and reported, and a fourth reference value for the remaining coefficients of the TRP not associated with the strongest TRP for the other polarizations of the SCI is selected from a 4-bit amplitude codebook and reported. Thus, the total payload is 12 bits for all layers.

[0455] In one example, for each of the above examples, an equal bit codebook (eg, 4 bits) may be used for the reference amplitude value.

[0456] In another example, for each of the above examples, an unequal bit codebook (eg, 4 bits) may be used for the reference amplitude value.

[0457] • For example, for reference amplitude values ​​associated with the strongest TRP, a 4-bit amplitude codebook is used, and for reference amplitude values ​​associated with weaker TRPs, a 3-bit amplitude codebook is used. The NW may signal the unequal bits via RRC, MAC-CE or DCI.

[0458] In one example, for each layer l (layer specific), the number N of reference amplitude values ref It is 2N TRP (or 2N). In the following example, we can replace N by N TRP .

[0459] In one example, for the polarization of the SCI of the TRP associated with the SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported), and other reference values ​​are used for the other polarizations of the TRP associated with the SCI, selected from an x-bit amplitude codebook (e.g., x=4) and reported. The remaining 2N TRP -2 Each of the reference values ​​is for other (N TRP -1) Reference amplitude value for each polarization of each TRP. The reference amplitude value is selected from a y-bit amplitude codebook (e.g., y=4 or y=3) and reported. In one example, x, y can be the same value (x=y), fixed or configured by the NW.

[0460] In one example, for the polarization of the SCI of the TRP associated with the SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported). For other polarizations, the second strongest coefficient indicator is used to indicate the W across all TRPs. 2 The position (or index) of the strongest coefficient (i.e., for the other polarizations of SCI, in W 2The other reference values ​​corresponding to the second SCI are selected from an x-bit amplitude codebook (e.g., x=4) and reported. In one example, the second SCI is common to all layers, i.e., one second SCI is reported for all layers. In another example, the second SCI is layer-specific, i.e., one second SCI is reported for each layer value. In one example, the other 2N TRP -2 The remaining reference values ​​are divided into two groups, where group 1 is used for (N TRP -1) polarization of the SCI for each of the TRPs, and group 2 for the SCI not associated with (N TRP -1) The other polarization of the SCI for each of the TRPs. For the reference values ​​in group 1, each reference value is selected from y 1 -bit amplitude codebook. For the reference values ​​in group 2, each reference value is selected from y 2 -bit amplitude codebook. In one example, each reference value in group 2 is a second-level reference value, i.e., each corresponding result reference value is calculated as the product of the second-level reference value and the reference value of the other polarization of the SCI of the TRP associated with the SCI. In one example, y 1 ,y 2 Can be the same value, fixed or configurable by NW.

[0461] In one example, for all layers (layer-common), the number is: the number of reference amplitude values ​​N ref It is 2N TRP (or 2N). The above examples herein may be examples of all layers, rather than examples of each layer.

[0462] In one example, for each layer l (layer specific), the number N of reference amplitude values ref is 2+(N TRP -1)(or 2+(N-1)). In the following example, we can replace N by N TRP .

[0463] In one example, for the polarization of the SCI of the TRP associated with the SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported), and other reference values ​​for other polarizations of the SCI of the TRP associated with the SCI are selected from an x-bit amplitude codebook (e.g., x=4) and reported. TRP -1 Each of the reference values ​​is for other (N TRP -1) Reference amplitude values ​​for both polarizations of each of the TRPs. The reference amplitude values ​​are selected from a y-bit amplitude codebook (e.g., y=4 or y=3) and reported. In one example, x, y can be the same value, fixed or configured by the NW.

[0464] In one example, for all layers (layer-common), the number of reference amplitude values ​​N ref is 2+(N TRP -1)(or 2+(N-1)). The above examples herein may be examples for all layers, rather than examples for each layer.

[0465] In one example, for each layer l (layer specific), the number N of reference amplitude values ref YesN TRP (or N). In the following examples, we can replace N by N TRP .

[0466] In one example, for both polarizations of the TRP associated with the SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported), and the remaining N TRP -1 reference value for each N not associated with SCI TRP -1TRP, each of which has two polarizations, is selected from an x-bit amplitude codebook (e.g., x=4) and reported. The remaining N TRP -1 reference value for each of the other N not associated with SCI TRP -2 TRP for each of the two polarizations. A reference amplitude value is selected from a y-bit amplitude codebook (eg, y=4 or y=3) and reported. In one example, x, y can be the same value, fixed or configured by the NW.

[0467] In one example, for all layers (layer-common), the number of reference amplitude values ​​N ref YesN TRP The above examples herein may be examples of all layers, rather than examples of each layer.

[0468] In one example, for each layer l (layer specific), the number N of reference amplitude values ref YesN TRP -specific (or N-specific). In the following examples, we can replace N by N TRP .

[0469] ●In one example, N ref =a for N TRP ≤b, and N ref = c for N TRP >b, for example, a=2, b=3, c=4.

[0470] In one example, for all layers (layer-common), the number of reference amplitude values ​​N ref YesN TRP-Specific. The above examples in this article may be examples for all layers, but not examples for each layer.

[0471] In these examples, each reference amplitude may be associated with a group of coefficients (including W2). Thus, if the number of reference amplitudes is X, then there are X groups of coefficients, and a reference amplitude is associated with each group.

[0472] In one example, for each layer l (layer specific), the number N of reference amplitude values ref By NW configuration (i.e., for each layer, N ref In one example, in the following examples and other examples of the present disclosure, N TRP Replace with N.

[0473] ●In one example, N ref ={2,2N TRP} and configure one of the values ​​via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0474] ●In one example, N ref ={2,2+N TRP -1} and configure one of the values ​​via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be one of the above examples.

[0475] ●In one example, N ref ={2,N TRP} and configure one of the values ​​via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0476] ●In one example, N ref ={2,N TRP ,2N TRP} and configure one of the values ​​via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0477] ●In one example, N ref ={2,2+N TRP -1,2NTRP} and configure one of the values ​​via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0478] ●In one example, {2,3,4,N TRP ,2N TRP ,2+N TRP Any subset of N-1} can be set for ref , and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0479] ●In one example, N ref = {2,3} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0480] ●In one example, N ref = {2, 3, 4} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0481] ●In one example, N ref = {2, 4} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0482] ●In one example, N ref ={2,4,…,2N TRP} and configure one of the values ​​via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0483] ●In one example, N ref ={2,3,4,…,N TRP} and configure one of the values ​​via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0484] ●In one example, N ref ={4,2N TRP} and configure one of the values ​​via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0485] ●In one example, N ref ={2,4,2N TRP} and configure one of the values ​​via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0486] In one example, only in configuration N TRP >1, configure N ref >2. That is, when N TRP =1,N ref is fixed to 2 (traditional Rel-16 codebook), and when N TRP >1,N ref Configured from a set of values ​​(S) via DCI, MAC-CE, or RRC. For example, S can be one of the sets described in the examples herein. For example, S = [2,3], S = [2,3,4], S = [2,4], S = [2,2N TRP ],S=[2,N TRP ]or……

[0487] In one example, for all layers (common to all layers), the number of reference amplitude values ​​N ref By NW configuration (i.e., for all layers, N ref The above examples in this article may be examples for all layers, rather than examples for each layer.

[0488] In one example, for each layer l (layer specific), the number N of reference amplitude values ref Determined and reported by the UE (i.e., for each layer, N ref In the following example, we can replace N by N TRP .

[0489] ●In one example, Nref ={2,2N TRP} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0490] ●In one example, N ref ={2,2+N TRP -1} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0491] ●In one example, N ref ={2,N TRP} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0492] ●In one example, N ref ={2,N TRP ,2N TRP} and determines and reports one of the values. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0493] ●In one example, N ref ={2,2+N TRP -1,2N TRP} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0494] ●In one example, {2,3,4,N TRP ,2N TRP ,2+N TRP Any subset of N-1} can be set for ref , and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0495] ●In one example, N ref = {2,3} and determine and report one of the values. Once a value (x) is determined, for N ref=x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0496] ●In one example, N ref = {2,3,4} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0497] ●In one example, N ref = {2,4} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0498] ●In one example, N ref ={2,4,…,2N TRP} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0499] ●In one example, N ref ={2,3,4,…,N TRP} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0500] ●In one example, N ref ={4,2N TRP} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0501] ●In one example, N ref ={2,4,2N TRP} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0502] In one example, only in configuration N TRP >1Configure N in the following cases ref >2. That is, when N TRP =1,N refis fixed to 2 (traditional Rel-16 codebook), and when N TRP >1,N ref Determined and reported from a set of values ​​(S). For example, S can be one of the sets described in the examples herein. For example, S = [2,3], S = [2,3,4], S = [2,4], S = [2,2N TRP ],S=[2,N TRP ]or……

[0503] In one example, for all layers (common to all layers), the number of reference amplitude values ​​N ref Determined and reported by the UE (i.e., for all layers, N ref The above examples in this article may be examples for all layers, rather than examples for each layer.

[0504] In one example, for each of the above examples, an equal bit codebook (eg, 3, 4 bits) may be used for the reference amplitude value.

[0505] In another example, for each of the above examples, unequal bit codebooks (eg, 2, 3, 4 bits) may be used for the reference amplitude values.

[0506] ● In one embodiment, the UE is configured / indicated with G≥1 TRP groups, where each TRP group includes one or more TRPs. Or the UE may be configured to determine N TRP (or N) TRPs, and report the G TRP groups. Or the TRP groups can be implicitly determined without signaling / reporting. Or the TRP groups are fixed, for example, based on TRP index, i.e., TRP groups include TRP#1…TRP#n 1 , TRP group includes TRP#n 1 +1…TRP#(n 1 +n 2 ) and so on, where N≤N TRP .

[0507] ● In one example, when G=2, for N TRP =4 or when the number of cooperative TRPs N = 4, where N ≤ N TRP In the case of , TRP group 1 includes one TRP and TRP group 2 includes three TRPs.

[0508] ● In one example, when G=2, for N TRP =3 or when the number of cooperative TRPs N = 3, where N ≤ N TRP In the case of , TRP group 1 includes two TRPs, and TRP group 2 includes one TRP.

[0509] ● In one example, when G=2, for N TRP =4 or when the number of cooperative TRPs N = 4, where N ≤ N TRP In the case of , TRP group 1 includes two TRPs, and TRP group 2 includes two TRPs.

[0510] ● In one example, when G=2, for N TRP =4 or when the number of cooperative TRPs N = 4, where N ≤ N TRP In the case of , TRP group 1 includes three TRPs, and TRP group 2 includes one TRP.

[0511] In one example, the value of G is fixed (e.g., to 2). In one example, the value of G is configured (e.g., via RRC). In one example, the value of G is reported by the UE (e.g., as part of a CSI report).

[0512] ● In one example, when G=2, for N TRP =2 or when the number of cooperative TRPs N = 2, where N ≤ N TRP In the case of TRP group 1, TRP group 1 includes one TRP, and TRP group 2 includes one TRP.

[0513] ● In one example, when G=2, for N TRP =3 or when the number of cooperating TRPs N=3, TRP group 1 includes one TRP and TRP group 2 includes two TRPs.

[0514] ●For example, when G = 3, for N TRP =4 or when the number of cooperative TRPs N = 4, where N ≤ N TRP In the case of , TRP group 1 includes two TRPs, TRP group 2 includes one TRP, and TRP group 3 includes one TRP.

[0515] When G = 2, A bit indicator (eg, a PMI component or a CRI component) may be used to indicate a TRP including TRP group 1.

[0516] In one example, for each layer l (layer specific), the number of reference amplitude values ​​(N ref ) is fixed regardless of the value of G. For example, N ref = 2. Therefore, for the υ layer, there are 2υ reference amplitude values ​​in total.

[0517] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to SCI is set to 1 for the polarization of SCI for all TRP groups Right now, for all g values ​​and for all TRP groups other polarizations (x≠x * ) are selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits per layer.

[0518] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI of the strongest TRP group Right now, Used to associate with the strongest TRP group g * value, and for the other polarizations of the strongest TRP group (x≠x * ) are selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits per layer.

[0519] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI of the strongest TRP group Right now, Used to associate with the strongest TRP group g * values, and with the polarization of the SCI for the strongest TRP group (i.e., ) Other reference values ​​for the remaining coefficients that are not relevant are selected from the 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits per layer.

[0520] @In one example, for each layer l, for the polarization of SCI for all TRP groups, one reference value corresponding to SCI is set to 1 (and therefore not reported). For each layer l, for the other polarization of SCI, the second strongest coefficient indicator is used to indicate W across all TRP groups 2 The position (or index) of the strongest coefficient (i.e., the W of the other polarizations of SCI 2 In one example, the other reference value corresponding to the second SCI is selected from an x-bit amplitude codebook (eg, x=4) and reported. This reference value is used for the other polarizations of the SCI for all TRP groups.

[0521] In one example, the reference amplitude value (N ref ) can be fixed regardless of the value of G. For example, N ref =2, and the total number of reference amplitude values ​​for the v layer is 2 (common to the layers). The examples herein may be examples for all layers, rather than examples for each layer.

[0522] In one example, for each layer l (layer specific), the reference amplitude value (N ref ) is fixed regardless of the value of G. For example, Nref = 3. Therefore, there are 3υ reference amplitude values ​​for the υ layer in total.

[0523] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI of the strongest TRP group Right now, Used to associate with the strongest TRP group g * value, and for the other polarizations of the strongest TRP group (x≠x * ) are selected and reported from a 4-bit amplitude codebook, and other reference values ​​for the remaining coefficients not associated with the strongest TRP group are selected and reported from a 4-bit amplitude codebook. Therefore, the total payload is 8 bits per layer.

[0524] In one example, the reference amplitude value (N ref ) can be fixed regardless of the value of G. For example, N ref =3, and the total number of reference amplitude values ​​for the v layer is 3 (layer-common). The examples herein may be examples for all layers, rather than examples for each layer.

[0525] In one example, for each layer l (layer specific), the number of reference amplitude values ​​(N ref ) is fixed regardless of the value of G. For example, N ref = 4. Therefore, there are 4v reference amplitude values ​​for the v layers in total.

[0526] ● In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, a reference value corresponding to the SCI is set to 1 for the polarization of the SCI of the strongest TRP group Right now, Used to associate with the strongest TRP group g * value, and for the other polarizations of the strongest TRP group (x≠x * ) is selected from a 4-bit amplitude codebook and reported, and other reference values ​​for the remaining coefficients not associated with the strongest TRP group are selected from a 4-bit amplitude codebook and reported, a third reference value for the remaining coefficients of the TRP group not associated with the strongest TRP group for the polarization of SCI is selected from a 4-bit amplitude codebook and reported, and a fourth reference value for the remaining coefficients of the TRP group not associated with the strongest TRP group for the other polarizations of SCI is selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 12 bits per layer.

[0527] In one example, for each layer l (layer specific), the number of reference amplitude values ​​(N ref) is fixed regardless of the value of G. For example, N ref =4. Therefore, there are 4v reference amplitude values ​​for v layers in total. The examples herein may be examples for all layers, rather than examples for each layer.

[0528] In one example, for each layer l (layer specific), the number N of reference amplitude values ref It's 2G.

[0529] ●In one example, for the polarization of the SCI of the TRP group associated with the SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported), and other reference values ​​for other polarizations of the TRP groups associated with the SCI are selected from an x-bit amplitude codebook (e.g., x=4) and reported. Each of the remaining 2G-2 reference values ​​is a reference amplitude value for each polarization of the other (G-1) TRP groups not associated with the SCI. The reference amplitude values ​​are selected from a y-bit amplitude codebook (e.g., y=4 or y=3) and reported. In one example, x, y can be the same value (x=y), fixed or configured by the NW.

[0530] In one example, for the polarization of the SCI of the TRP group associated with the SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported). For other polarizations, the second strongest coefficient indicator is used to indicate W across all TRP groups. 2 The position (or index) of the strongest coefficient (i.e., the W of the other polarizations of SCI 2 (half the number of coefficients in ). Other reference values ​​corresponding to the second SCI are selected from an x-bit amplitude codebook (e.g., x=4) and reported. In one example, the second SCI is common to all layers, i.e., one second SCI is reported for all layers. In another example, the second SCI is layer-specific, i.e., one second SCI is reported for each layer value. In one example, the other 2G-2 remaining reference values ​​are divided into two groups, where Group 1 is used for the polarization of the SCI for each of the (G-1)TRP groups that are not associated with the SCI, and Group 2 is used for the other polarizations of the SCI for each of the (G-1)TRP groups that are not associated with the SCI. For the reference values ​​in Group 1, each reference value is selected from y 1 For the reference values ​​in group 2, each reference value is selected from y 2 bit amplitude codebook. In one example, each reference value in group 2 is a second-level reference value, i.e., each corresponding result reference value is calculated as the product of the second-level reference value and the reference value of the other polarization of the SCI of the TRP group associated with the SCI. In one example, x, y 1 ,y 2 Can be the same value, fixed or configurable by NW.

[0531] In one example, for all layers (layer-common), the number of reference amplitude values ​​N ref It is 2G. The above examples can be examples for all layers. The examples in this article can be examples for all layers, not examples for each layer.

[0532] In one example, for each layer l (layer specific), the number n of reference amplitude values ref It is 2+(G-1).

[0533] ●In one example, for a polarization of the SCI of a TRP group associated with the SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported), and other reference values ​​for other polarizations of the SCI for the TRP group associated with the SCI are selected from an x-bit amplitude codebook (e.g., x=4) and reported. Each of the remaining G-1 reference values ​​is a reference amplitude value for two polarizations of each of the (G-1) TRP groups not associated with the SCI. The reference amplitude values ​​are selected from a y-bit amplitude codebook (e.g., y=4 or y=3) and reported. In one example, x, y can be the same value, fixed, or configured by the NW.

[0534] In one example, for all layers (common to all layers), the number of reference amplitude values ​​N ref is 2+(G-1). The above examples may be examples for all layers. The examples herein may be examples for all layers, not examples for each layer.

[0535] In one example, for each layer l (layer specific), the number n of reference amplitude values ref It's G.

[0536] ●In one example, for the two polarizations of the TRP group associated with the SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported), and each of the remaining G-1 reference values ​​is used for the two polarizations of each of the G-1 TRP groups not associated with the SCI, selected from an x-bit amplitude codebook (e.g., x=4), and reported. Each of the remaining G-1 reference values ​​is a reference amplitude value for the two polarizations of each of the other G-1 TRP groups not associated with the SCI. The reference amplitude values ​​are selected from a y-bit amplitude codebook (e.g., y=4 or y=3) and reported. In one example, x, y can be the same value, fixed, or configured by the NW.

[0537] In one example, for all layers (layer-common), the number of reference amplitude values ​​n ref G. The above examples may be examples for all layers. The examples herein may be examples for all layers, not examples for each layer.

[0538] In one example, for each layer l (layer specific), the number N of reference amplitude values ref is G-specific.

[0539] ●In one example, N ref =a for G≤b, and N ref =c for G>b, for example, a=2, b=1, c=4.

[0540] In one example, for all layers (layer-common), the number of reference amplitude values ​​N ref is G-specific. The above examples may be examples for all layers. The examples herein may be examples for all layers, not for each layer.

[0541] In these examples, each reference amplitude may be associated with a group of coefficients (including W2). Thus, if the number of reference amplitudes is X, then there are X groups of coefficients, and a reference amplitude is associated with each group.

[0542] In one example, for each layer l (layer specific), the number N of reference amplitude values ref By NW configuration (i.e., for each layer, N ref a value of ).

[0543] ●In one example, N ref = {2,2G} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0544] ●In one example, N ref = {2, 2 + G-1} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0545] ●In one example, N ref = {2, G} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0546] ●In one example, N ref= {2, G, 2G} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0547] ●In one example, N ref = {2,2+G-1,2G} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0548] ● In one example, any subset of {2, 3, G, 2G, 2+G-1} can be set for N ref , and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0549] ●In one example, N ref = {2,3} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0550] ●In one example, N ref = {2, 3, 4} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0551] ●In one example, N ref = {2, 4} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0552] ●In one example, N ref = {2, 4, ..., 2G} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref=x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0553] ●In one example, N ref = {2, 3, 4, ..., G} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0554] ●In one example, N ref = {4, 2G} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0555] ●In one example, N ref = {2, 4, 2G} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value (x) is configured, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0556] In one example, N is configured only when G>1. ref >2. That is, when N TRP =1,N ref is fixed to 2 (traditional Rel-16 codebook), and when g>1, N ref Configured from a set of values ​​(S) via DCI, MAC-CE, or RRC. For example, S can be one of the sets described in the examples herein. For example, S = [2, 3], S = [2, 3, 4], S = [2, 4], S = [2, 2G], S = [2, G].

[0557] In one example, for all layers (layer-common), the number of reference amplitude values ​​N ref By NW configuration (i.e., for all layers, N ref The above examples can be examples for all layers. The examples in this article can be examples for all layers, not examples for each layer.

[0558] In one example, for each layer l (layer specific), the number N of reference amplitude values ref Determined and reported by the UE (i.e., for each layer, N ref a value of ).

[0559] ●In one example, Nref = {2,2G} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0560] ●In one example, N ref = {2,2 + G-1} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0561] ●In one example, N ref = {2, G} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0562] ●In one example, N ref = {2, G, 2G} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0563] ●In one example, N ref = {2,2 + G - 1,2G} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0564] ● In one example, any subset of {2, 3, G, 2G, 2+G-1} can be set for N ref , and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0565] ●In one example, N ref = {2,3} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0566] ●In one example, N ref = {2,3,4} and determine and report one of the values. Once a value (x) is determined, for N ref=x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0567] ●In one example, N ref = {2,4} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0568] ●In one example, N ref = {2,4,…,2G} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0569] ●In one example, N ref = {2,3,4,…,G} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0570] ●In one example, N ref = {4,2G} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0571] ●In one example, N ref = {2,4,G} and determine and report one of the values. Once a value (x) is determined, for N ref =x, the reference amplitude value (and the corresponding coefficient grouping) can be based on one of the above examples.

[0572] In one example, only in configuration N TRP >1, configure N ref >2. That is, when N TRP =1,N ref is fixed to 2 (traditional Rel-16 codebook), and when N TRP >1,N ref Determine and report from a set of values ​​(S). For example, S can be one of the sets described in the examples herein. For example, S = [2,3], S = [2,3,4], S = [2,4], S = [2,2N TRP ],S=[2,N TRP ].

[0573] In one example, for all layers (layer-common), the number of reference amplitude values ​​N ref Determined and reported by the UE (i.e., for all layers, N ref The above examples can be examples for all layers. The examples in this article can be examples for all layers, not examples for each layer.

[0574] In one example, for each of the above examples, an equal bit codebook (eg, 3, 4 bits) may be used for the reference amplitude value.

[0575] In another example, for each of the above examples, unequal bit codebooks (eg, 2, 3, 4 bits) may be used for the reference amplitude values.

[0576] In one embodiment, the UE is configured with one (subset) of the following grouping schemes for reference amplitudes via RRC, MAC-CE or DCI. Or the UE is configured to determine one (subset) of the following grouping schemes and report it.

[0577] =Scheme 1: For the reference amplitude, the group includes TRPs with two polarizations. Therefore, the total number of groups of reference amplitudes is N.

[0578] =Scheme 2: For the reference amplitude, the group includes TRPs with one polarization. Therefore, the total number of groups of reference amplitudes is 2N.

[0579] =Scheme 3: For the reference amplitude, the group includes TRP groups with two polarizations. Therefore, the total number of groups of reference amplitude is G.

[0580] =Scheme 4: For the reference amplitude, the group includes a TRP group with one polarization. Therefore, the total number of groups of the reference amplitude is 2G.

[0581] • Scheme 5: For the reference amplitude, the group includes all TRPs with both polarizations. Therefore, the total number of groups for the reference amplitude is 1.

[0582] • Scheme 6: For the reference amplitude, the group includes all TRPs with one polarization. Therefore, the total number of groups of reference amplitudes is 2.

[0583] In one embodiment, the UE is configured with one (subset) of the following grouping schemes for reference phase via RRC, MAC-CE or DCI. Or the UE is configured to determine and report one (subset) of the following grouping schemes for reference phase.

[0584] @Scheme 1: For reference amplitude, a group includes TRPs with two polarizations. Therefore, the total number of groups for reference phase is N.

[0585] =Scheme 2: For reference amplitude, a group includes TRPs with one polarization. Therefore, the total number of groups of reference phase is 2N.

[0586] =Scheme 3: For the reference amplitude, the group includes TRP groups with two polarizations. Therefore, the total number of groups of reference phase is G.

[0587] =Scheme 4: For reference amplitude, the group includes a TRP group with one polarization. Therefore, the total number of groups for reference phase is 2G.

[0588] • Scheme 5: For reference amplitude, the group includes all TRPs with both polarizations. Therefore, the total number of groups for reference phase is 1.

[0589] • Scheme 6: For reference amplitude, the group includes all TRPs with one polarization. Therefore, the total number of groups of reference phase is 2.

[0590] In one embodiment, for each layer l (layer specific), the number of reference phase values ​​(N ref,phase ) is 2N TRP (or 2)N). Therefore, for the υ layer, there are a total of 2N TRP v (or 2Nv) reference phase values.

[0591] In one embodiment, for all layers l (common to all layers), the number of reference phase values ​​(N ref,phase ) is 2N TRP (or 2)N). Therefore, for layer v, there are 2N in total TRP (or 2N) reference phase values.

[0592] In one embodiment, for each layer l (layer specific), the number of reference phase values ​​(N ref,phase ) is 1 (i.e., TRP common and polarization common). Therefore, there are a total of v reference phase values.

[0593] In one embodiment, for all layers l (common to all layers), the number of reference phase values ​​(N ref,phase ) is 1. Therefore, for the υ layer, there is a total of 1 reference phase value.

[0594] In one embodiment, for each layer l (layer specific), the number of reference phase values ​​(N ref,phase ) is N TRP (or N). Therefore, there are a total of N TRP v (or Nv) reference phase value.

[0595] In one embodiment, for all layers l (common to all layers), the number of reference phase values ​​(N ref,phase ) is N TRP(or N). Therefore, for the υ layer, there are a total of N TRP (or N) reference phase values.

[0596] In one embodiment, for each layer l (layer specific), the number of reference phase values ​​(N ref,phase ) is N ref , where N ref is the number of reference amplitude values. For example, N described in the embodiments of this article can be applied ref In this case, for the υ layer, there are a total of N ref The reference phase value of v.

[0597] In one embodiment, for all layers l (common to all layers), the number of reference phase values ​​(N ref,phase ) is N ref , where N ref is the number of reference amplitude values. For example, N described in the embodiments of this article can be applied ref In this case, for the υ layer, there are a total of N ref The reference phase value.

[0598] In one embodiment, for each layer l (layer specific), the number of reference phase values ​​(N ref,phase )yes Where N ref is the number of reference amplitude values. For example, N described in the embodiments of this article can be applied ref In this case, for layer v, there are a total of The reference phase value.

[0599] In one embodiment, for all layers l (common to all layers), the number of reference phase values ​​(N ref,phase )yes Where N ref is the number of reference amplitude values. For example, N described in the embodiments of this article can be applied ref In this case, for the layer υ, there are a total of The reference phase value.

[0600] In one embodiment, for the mTRP codebook, W f The basis vectors (or indices of FD basis vectors) and W 2 FD index (column W 2 ) or the FD index of the coefficient is based on or relative to the FD beam index f as the reference FD beam index * Shift (or rotate or remap).

[0601] In the Rel-16 type II codebook, the remapping process is as follows [REF 9]: Let is the index i 2,4,l And order is the index It identifies the strongest coefficient of layer l, i.e., i for l = 1, ..., υ 2,4,l Elements Relative to Remap codebook index n 3,l , so that after remapping, The index f is relative to Remap to The index of the strongest coefficient after remapping is Index i 2,4,l ,i 2,5,l and i 1,7,l Indicates the remapped magnitude coefficients, phase coefficients, and bitmap.

[0602] In one example, the strongest coefficient of layer l is 1,8,l ∈{0,1,…,2L-1} identification, which is obtained as follows:

[0603]

[0604] For l=1,…,v.

[0605] In one example, the strongest coefficient of layer l is 1,8,l ∈{0,1,…,2L-1} identification, which is obtained as follows: For all ranks v∈{1,..,4} and l=1,…,v.

[0606] In one example, the reference FD beam index f * is the FD beam index f of the SCI (of the strongest TRP). The SCI is therefore indexed f * is layer-common, ie, the same for all layers.

[0607] In one example, the reference FD beam index f * is fixed (e.g., the lowest index in the FD basis vector). Fixed index f * is layer-common, ie, the same for all layers.

[0608] In one example, the reference FD beam index f * It is configured by NW (layer common) via DCI, MAC-CE or RRC. The configured index can be one of the indices of the FD basis vector. Or the configured index can be different from the index of the FD basis vector. The configured index f * is layer-common, ie, the same for all layers.

[0609] In one example, the W associated with the strongest TRP f The basis vectors and W2FD indices (columns of W2) are based on the FD beam index f * Shift (or rotate or remap FD indices) where f * is according to one of the above examples. For the remaining TRPs, no shift or rotation or remapping may be performed. Index f * is layer-common, ie, the same for all layers.

[0610] In one example, the W associated with all TRPs f The basis vectors and vFD indices (columns of W2) are based on the FD beam index f * Shift (or rotate or remap FD indices) where f * is based on one of the examples above.

[0611] In one example, the reference FD beam index f l * is the FD beam index f of the SCI (of the strongest TRP) of each layer l l . SCI therefore indexes f l * Are layer specific, i.e., one SCI per layer.

[0612] In one example, the reference FD beam index f l * For each layer l is fixed (e.g., the lowest index in the FD basis vector). .Fixed index fl l * Are layer specific, i.e., one SCI per layer.

[0613] In one example, the reference FD beam index f l * is configured by the NW (layer specific) via DCI, MAC-CE or RRC. The configured index can be one of the indices of the FD basis vector. Or the configured index can be different from the index of the FD basis vector. The configured index f l * Are layer specific, i.e. one per layer.

[0614] In one example, the W associated with the strongest TRP f Basis vectors and W 2 FD Index (W 2 ) based on the FD beam index f l * , shift (or rotate or remap FD index), where fl l *is according to one of the above examples (2.1.6 to 2.1.8). For the remaining TRPs, no shift or rotation or remapping may be performed. Index fl l * Are layer specific, i.e. one per layer.

[0615] In one example, the W associated with all TRPs f Basis vectors and W 2 FD Index (W 2 ) based on the FD beam index f l * Shift (or rotate or remap FD indices) where f l * is according to one of the above examples (2.1.6 to 2.1.8).

[0616] In one embodiment, about W 2 The reference amplitude / phase values ​​(and corresponding coefficient sets) of the quantization groups and SCI (for each layer) are according to at least one of the following examples / alternatives:

[0617] ● In an alternative: a group includes one polarization across all TRPs / TRP groups (C group,phase =1,C group,amp =2), one (common) SCI across all TRPs / TRP groups.

[0618] ○ The alternative is similar to one or more examples herein and / or one or more embodiments herein.

[0619] ● In an alternative: a group includes one TRP / one polarization of a TRP group for each TRP / TRP group SCI (C group,phase =N,C group,amp =2N).

[0620] ○ The alternative is to go from a single TRP case to a multiple TRP case (N TRP >1), a simple extension of the Rel-16 / 17 Type-II reference amplitude / phase grouping.

[0621] ● In an alternative: a group includes one polarization for one TRP / TRP group with a common phase reference (C group,phase =1,C group,amp =2N).

[0622] ○ The alternative is similar to one or more examples herein and / or one or more embodiments herein.

[0623] @In an alternative: for 1 TRP / TRP group, one group includes one polarization, and for the remaining N-1 TRPs, one group includes one polarization across the remaining N-1 TRPs / TRP groups (C group，amp =2+2=4), with a common phase reference (C group，phase =1).

[0624] ○ The alternative is similar to one or more examples herein and / or one or more embodiments herein.

[0625] In one example, for 1TRP / TRP-group in Alt4, it can be the reference TRPr * (e.g., the strongest TRP (TRP-group) as described in the embodiments of this document), which may be based on at least one of the following examples.

[0626] ● In one example, reference TRPr * Configured by NW via DCI, MAC-CE or DCI.

[0627] ● In one example, reference TRPr * Determined by the UE (e.g., the strongest TRP). In one example, reference TRPr * Can be reported explicitly or implicitly.

[0628] In one example, multiple alternatives among the above are supported / specified, one of which may be configured via higher layer (RRC) or MAC CE or DCI.

[0629] In one embodiment, the UE is configured with CSI reporting based on the mTRP (or D-MIMO or C-JT) codebook via the higher layer parameter codebookType, for example, set to "typeII-r18-cjt" or "typeII-PortSelection-r18-cjt", where the codebook is one of the following two modes: In an example, one of the two modes is configured via higher layers (e.g., via parameter codebookMode).

[0630] ●Mode 1: Select based on TRP / TRP group SD / FD basis. Example formulation (N TRP = number of TRPs or TRP groups): UE reports (i) SD basis vectors for each TRP, (ii) FD basis vectors for each TRP, and (iii) the joint W2 across all TRPs or one W2 for each TRP.

[0631]

[0632] ● Mode 2: SD-based selection and association based on TRP / TRP group (port group or resource) (across N TRPTRP )FD basis selection. Example formulation N TRP =number of TRPs or TRP groups): UE reports (i) SD basis vectors for each TRP, (ii) one common / joint FD basis vector across all TRPs, and (iii) the joint W2 across all TRPs or one W2 for each TRP.

[0633] or

[0634] Here, we can use N and N interchangeably. TRP .

[0635] In one example, Mode 1 may be a codebook described in one or more embodiments of US Provisional Application No. 63 / 398,436, and Mode 2 may be a codebook described in one or more embodiments of US Provisional Application No. 63 / 398,436.

[0636] In one example, two modes can share similar detailed designs, such as parameter combinations, basis selection, TRP (group) selection, reference amplitude, Quantitative solution.

[0637] ● In one example, the parameter combination may be L,p such as for a conventional type IICJT codebook v ,β, or a tuple of parameters such as M,α,β for port selection type IICJT codebook.

[0638] • In one example, the basis selection scheme may be the SD basis selection and / or the FD basis selection scheme described herein.

[0639] ●In one example, TRP selection may be an element / example described in U.S. Provisional Patent Application No. 63 / 359,658.

[0640] • In one example, the reference amplitude scheme may be an element / example described in US Provisional Patent Application No. 63 / 343,847.

[0641] ●In one example, The quantization scheme can include a strongest coefficient indicator, an upper limit of non-zero coefficients, a reference amplitude, a scheme in which each coefficient is decomposed into phase and amplitude and they are selected corresponding codebooks, and codebook subset restriction.

[0642] In one embodiment, the reference amplitude / phase design method (ALT1-ALT4) described herein is applied / used in Mode 1 and / or Mode 2.

[0643] In the Rel-16 / 17 Type-II codebook, for W 2 The amplitude quantization scheme is in a differential manner, that is, each amplitude value is calculated as p (1) p (2) , where p (1) is the reference amplitude value, and p (2) is the (differential) coefficient amplitude value. In [REF 9], for layer l = 1, ..., v, there are two reference amplitude values where a reference value corresponding to SCI is set to 1 (and therefore not reported, i.e., and ), select other reference values ​​for other polarizations of the coefficients corresponding to the SCI from the 4-bit amplitude codebook in Table 5.2.2.2.5-2 in [REF9], and report (i.e., indicator is reported). For p (2) , please refer to [REF 9] for details.

[0644] In one example, for Alt1, for layers l=1,…,v, the amplitude coefficients can be obtained by express.

[0645] In one example, for Alt1, for And for layers l=1,…,v, the amplitude coefficients can be obtained by express.

[0646] In one example, for Alt2, the amplitude coefficient can be obtained by Represents, where TRPr=1,…,N and layer l=1,…,v.

[0647] In one example, for Alt3, the amplitude coefficient can be obtained by Represents, where TRPr=1,…,N and layer l=1,…,v.

[0648] In one example, for Alt4, the amplitude coefficient can be obtained by Indicates that TRPr * is the reference / strongest TRP index and is used for And layer l=1,…,v.

[0649] Any of the examples regarding ALT1-ALT4 above may be applied to any of the following examples / embodiments.

[0650] ●In one example, the reference amplitude / phase design method of Alt3 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt1 in this article is applied / used in Mode 2.

[0651] ●In one example, the reference amplitude / phase design method of Alt1 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt3 in this article is applied / used in Mode 2.

[0652] ●In one example, the reference amplitude / phase design method of Alt3 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt4 in this article is applied / used in Mode 2.

[0653] ●In one example, the reference amplitude / phase design method of Alt4 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt3 in this article is applied / used in Mode 2.

[0654] ●In one example, the reference amplitude / phase design method of Alt4 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt1 in this article is applied / used in Mode 2.

[0655] ●In one example, the reference amplitude / phase design method of Alt1 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt4 in this article is applied / used in Mode 2.

[0656] ●In one example, the reference amplitude / phase design method of Alt2 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt1 in this article is applied / used in Mode 2.

[0657] ●In one example, the reference amplitude / phase design method of Alt1 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt2 in this article is applied / used in Mode 2.

[0658] ●In one example, the reference amplitude / phase design method of Alt2 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt3 in this article is applied / used in Mode 2.

[0659] @In one example, the reference amplitude / phase design method of Alt3 of this article is applied / used in mode 1, and the reference amplitude / phase design method of Alt2 of this article is applied / used in mode 2.

[0660] ●In one example, the reference amplitude / phase design method of Alt2 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt4 in this article is applied / used in Mode 2.

[0661] ●In one example, the reference amplitude / phase design method of Alt4 in this article is applied / used in Mode 1, and the reference amplitude / phase design method of Alt2 in this article is applied / used in Mode 2.

[0662] ●In one example, for mode 1, the reference amplitude / phase design method of Alt1 or the reference amplitude / phase design method of Alt3 in this article can be configured via RRC, MAC-CE or DCI, and for mode 2, the reference amplitude / phase design method of Alt1 in this article is applied / used.

[0663] ●In one example, for mode 2, the reference amplitude / phase design method of Alt1 or the reference amplitude / phase design method of Alt3 in this article can be configured via RRC, MAC-CE or DCI, and for mode 1, the reference amplitude / phase design method of Alt1 in this article is applied / used.

[0664] ●In one example, for mode 1, the reference amplitude / phase design method of Alt1 or the reference amplitude / phase design method of Alt3 in this article can be configured via RRC, MAC-CE or DCI, and for mode 2, the reference amplitude / phase design method of Alt3 in this article is applied / used.

[0665] ●In one example, for mode 2, the reference amplitude / phase design method of Alt1 or the reference amplitude / phase design method of Alt3 in this article can be configured via RRC, MAC-CE or DCI, and for mode 1, the reference amplitude / phase design method of Alt3 in this article is applied / used.

[0666] ●In one example, for Mode 1 and Mode 2, the reference amplitude / phase design method of Alt1 or the reference amplitude / phase design method of Alt3 in this document may be configured via RRC, MAC-CE, or DCI.

[0667] In one embodiment, for reporting the reference amplitude, the UE is configured to report the reference amplitude according to at least one of the following examples.

[0668] • In one example, when considering Alt2 described herein, 2N-1 reference amplitudes are reported, and 1 reference amplitude (associated with SCI) is not reported.

[0669] • In one example, when considering Alt2 described herein, 2N reference amplitudes are reported.

[0670] • In one example, when considering Alt3 described herein, 2N-1 reference amplitudes are reported, and 1 reference amplitude (associated with SCI) is not reported.

[0671] • In one example, when considering Alt3 described herein, 2N reference amplitudes are reported.

[0672] • In one example, when considering Alt4 described herein, 3 reference amplitudes are reported and 1 reference amplitude (associated with SCI) is not reported.

[0673] • In one example, when considering Alt4 described herein, 4 reference amplitudes are reported.

[0674] • In one example, when considering Alt1 described herein, 1 reference amplitude is reported and 1 reference amplitude (associated with SCI) is not reported.

[0675] • In one example, when considering Alt1 described herein, 2 reference amplitudes are reported.

[0676] In one embodiment, the UE is configured to report via CSI Part 1 which reference amplitude / phase design method is selected.

[0677] In one example, when mode 1 is configured, one of the reference amplitude / phase design methods Alt1 and Alt3 described herein is selected and reported via CSI part 1. When mode 2 is configured, the reference amplitude / phase design method Alt1 described herein is applied / used (no selection and reporting required).

[0678] In one example, when mode 1 is configured, one of the reference amplitude / phase design methods Alt1 and Alt3 described herein is selected and reported via CSI part 1. When mode 2 is configured, the reference amplitude / phase design method Alt3 described herein is applied / used (no selection and reporting required).

[0679] In one example, when mode 2 is configured, one of the reference amplitude / phase design methods Alt1 and Alt3 described herein is selected and reported via CSI part 1. When mode 1 is configured, the reference amplitude / phase design method Alt1 described herein is applied / used (not selected and not reported).

[0680] In one example, when Mode 2 is configured, one of the reference amplitude / phase design methods Alt1 and Alt3 described herein is selected and reported via CSI Part 1. When Mode 1 is configured, the reference amplitude / phase design method Alt2 described herein is applied / used (not selected and not reported).

[0681] In one example, when mode 1 is configured, one of the reference amplitude / phase design methods Alt1 and Alt3 described herein is selected and reported via CSI Part 1. When mode 2 is configured, one of the reference amplitude / phase design methods Alt1 and Alt3 described herein is selected and reported via CSI Part 1.

[0682] In one embodiment, the UE reports the UE capabilities regarding the reference amplitude / phase design method supported by the UE, and the NW configures it according to the reported UE capabilities. The UE capability report may be at least one of the following examples.

[0683] • In one example, the UE may report the UE capability of supporting only the reference amplitude / phase design method of Alt1, and the NW may configure only the Alt1 method for the UE.

[0684] • In one example, the UE may report the UE capability of supporting only the reference amplitude / phase design method of Alt3, and the NW may configure only the Alt3 method for the UE.

[0685] • In one example, the UE may report the UE capability of supporting both the reference amplitude / phase design methods of Alt1 and Alt3, and the NW may configure the UE with either the Alt1 or Alt3 method.

[0686] • In one example, when mode 1 is configured, the UE may report the UE capability of supporting only the reference amplitude / phase design method of Alt1, and the NW may configure only the Alt1 method for the UE.

[0687] ● In one example, when mode 1 is configured, the UE may report the UE capability of supporting only the reference amplitude / phase design method of Alt3, and the NW may configure only the Alt3 method for the UE.

[0688] • In one example, when Mode 1 is configured, the UE may report the UE capability of supporting both the reference amplitude / phase design methods of Alt1 and Alt3, and the NW may configure the UE with either the Alt1 or Alt3 method.

[0689] • In one example, when mode 2 is configured, the UE may report the UE capability of supporting only the reference amplitude / phase design method of Alt1, and the NW may configure only the Alt1 method for the UE.

[0690] • In one example, when mode 2 is configured, the UE may report the UE capability of supporting only the reference amplitude / phase design method of Alt3, and the NW may configure only the Alt3 method for the UE.

[0691] • In one example, when Mode 2 is configured, the UE may report the UE capability of supporting both the reference amplitude / phase design methods of Alt1 and Alt3, and the NW may configure the UE with either the Alt1 or Alt3 method.

[0692] In one example, when Mode 1 or Mode 2 is configured, the UE may report the UE capability of supporting only the reference amplitude / phase design method of Alt1, and the NW may configure only the Alt1 method for the UE.

[0693] ● In one example, when mode 1 or mode 2 is configured, the UE may report the UE capability of supporting only the reference amplitude / phase design method of Alt3, and the NW may configure only the Alt3 method for the UE.

[0694] • In one example, when mode 1 or mode 2 is configured, the UE may report the UE capability of supporting both reference amplitude / phase design methods of Alt1 and Alt3, and the NW may configure the Alt1 or Alt3 method for the UE.

[0695] ●In one example, when configured with mode 1 having an FD basis selection offset selected from a set including an oversampling factor (i.e., for a fractional offset or an oversampling offset), the UE may report the UE capability regarding supporting the reference amplitude / phase design method of Alt3, and the NW may configure the Alt3 method for the UE.

[0696] ●In one example, when configured with mode 1 having an FD basis selection offset selected from a set including an oversampling factor (i.e., for a fractional offset or an oversampling offset), the UE may report the UE capability of supporting only the reference amplitude / phase design method of Alt1, and the NW may configure the Alt1 method for the UE.

[0697] In one embodiment, the RRC parameters for the reference amplitude / phase design method for Alt1 and Alt3 described herein are parameter A may (or information element (IE)) may include A 1 or A 2 .

[0698] ●In one example, A 1 ='2 and A 2='2N'. Here, "2" corresponds to Alt1, and "2N" corresponds to Alt3.

[0699] ●In one example, A 1 = 'Scheme 1' and A 2 ='Scheme 2'. Here, 'Scheme 1' corresponds to Alt1, and 'Scheme 2' corresponds to Alt3.

[0700] ●In one example, A 1 = 'Scheme 1' and A 2 ='Scheme 2'. Here, 'Scheme 1' corresponds to Alt3, and 'Scheme 2' corresponds to Alt1. In one example, A 1 ='1' and A 2 ='2'. Here, '1' corresponds to Alt1, and '2' corresponds to Alt2.

[0701] ●In one example, A 1 ='1' and A 2 ='2'. Here, '2' corresponds to Alt1, and '1' corresponds to Alt2.

[0702] ●In one example, A 1 = 'Method 1' and A 2 ='Method 2'. Here, 'Method 1' corresponds to Alt1, and 'Method 2' corresponds to Alt2.

[0703] ●In one example, A 1 = 'Method 1' and A 2 ='Method 2'. Here, 'Method 2' corresponds to Alt1, and 'Method 1' corresponds to Alt2.

[0704] In one example, the RRC parameters It may be named "referenceAmp", "referenceAmpScheme", "referenceAmpMethod", or "nrof referenceamps", but should not be limited to these names. Other examples for naming may be considered.

[0705] Fig.13 A flowchart of an example method for operating a UE according to an embodiment of the present disclosure is shown. Fig.13 The method 1300 may be performed by Figure 1 Any one of UEs 111-116 (such as Figure 3 UE 116) is executed, and the corresponding method can be performed by Figure 1 Any of BS101-103 (such as Figure 2The method 1300 is for illustration only, and other embodiments may be used without departing from the scope of the present disclosure.

[0706] The method begins with the UE receiving information about CSI reporting (1310). For example, in 1310, the information indicates N trp CSI-RS resources, where: N trp >1. Then, UE measures N trp CSI-RS resources (1320). For example, in 1320, the UE may perform measurements based on the received information.

[0707] Then, the UE determines the trp CSI reports associated with CSI-RS resources (1330). For example, in 1330, the UE generates a CSI report based on the received information and N∈{1,2,…,N trp} to determine the CSI report. In various embodiments, the CSI report includes the strongest coefficient indicator (SCI) (SCI l ), and SCI l instruct The index of the strongest coefficient in coefficients, where l∈{1,…,v} is the layer index, υ≥1 is the rank value, and is the total number of non-zero coefficients of layer l associated with the CSI-RS port corresponding to the NCSI-RS resource. In various embodiments, when v=1, SCI l The payload is bits, and when v>1, bits, where K NZ is the total number of nonzero coefficients.

[0708] In various embodiments, to determine the CSI report, the UE determines two first amplitude coefficients for each layer l=1, ..., v, wherein one of the two first amplitude coefficients corresponds to a first set of coefficients and the remaining one of the two first amplitude coefficients corresponds to a second set of coefficients. For example, the first set of coefficients includes r =0,1,…,L r Second amplitude coefficient of -1 And the second set of coefficients includes r =L r ,L r +1,…,2L r Second amplitude coefficient of -1 L ris the number of spatial domain (SD) basis vectors of CSI-RS resource r, m is the index of the frequency domain (FD) vector, and r = 1, 2.., N. For example, for each layer l = 1, 2, ..., ν, the two first amplitude coefficients are included in the second amplitude coefficient is set to 1, one of the two first amplitude coefficients is not reported, and the remaining one of the two first amplitude coefficients is reported. For example, for each layer l=1,…,v, the CSI report also includes an indicator indicating the reported one of the two first amplitude coefficients, and the size of the indicator is 4 bits, which indicates one of the following: Where R represents the reserved state.

[0709] In various embodiments, to determine the CSI report, for each layer l=1, ..., v, the UE determines 2N first amplitude coefficients, wherein each of the 2N first amplitude coefficients corresponds to the kth group of coefficients, wherein k=1, 2, ..., 2N, and the (2r-1)th group of coefficients includes a first coefficient having an index i r =0,1,…,L r Second amplitude coefficient of -1 And the (2r)th group of coefficients includes coefficients with index i r =L r ,L r +1,…,2L r Second amplitude coefficient of -1 Where L r is the number of spatial domain (SD) basis vectors of CSI-RS resource r, m is the index of the frequency domain (FD) vector, and r = 1, 2.., N. For example, for each layer l = 1, 2, ..., v, and including the second amplitude coefficient

[0710] The UE then sends a CSI report (1340).

[0711] Any of the above variant embodiments may be used independently or in combination with at least one other variant embodiment. The above flow charts illustrate example methods that can be implemented according to the principles of the present disclosure, and various changes may be made to the methods illustrated in the flow charts herein. For example, although shown as a series of steps, the various steps in each figure may overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, a step may be omitted or replaced by another step.

[0712] Fig.14 A block diagram of a terminal (or user equipment (UE)) according to an embodiment of the present disclosure is shown.

[0713] like Fig.14As shown, the terminal according to the embodiment may include a transceiver 1410, a memory 1420 and a processor (or controller) 1430. The transceiver 1410, the memory 1420 and the processor (or controller) 1430 of the terminal may operate according to the communication method of the above-mentioned terminal. However, the components of the terminal are not limited thereto. For example, the terminal may include Fig.14 1430, the transceiver 1410, and the memory 1420 may be implemented as a single chip. In addition, the processor (or controller) 1430 may include at least one processor. In addition, Fig.14 The terminal corresponds to Figure 3 UE.

[0714] Transceiver 1410 is collectively referred to as a terminal station receiver and a terminal transmitter, and can send / receive signals to / from a base station or another terminal. The signal sent to or received from the terminal may include control information and data. Transceiver 1410 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that performs low-noise amplification and down-conversion on the frequency of the received signal. However, this is only an example of transceiver 1410, and the components of transceiver 1410 are not limited to RF transmitters and RF receivers.

[0715] In addition, the transceiver 1410 may receive a signal through a wireless channel and output the signal to the processor (or controller) 1430 , and transmit a signal output from the processor (or controller) 1430 through a wireless channel.

[0716] The memory 1420 may store programs and data required for the operation of the terminal. In addition, the memory 1420 may store control information or data included in a signal obtained by the terminal. The memory 1420 may be a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM, and a DVD, or a combination of storage media.

[0717] The processor (or controller) 1430 may control a series of processes so that the terminal operates as described above. For example, the processor (or controller) 1430 may receive a data signal and / or a control signal, and the processor (or controller) 1430 may determine a result of receiving a signal sent by a base station and / or another terminal.

[0718] Fig.15 A block diagram of a base station according to an embodiment of the present disclosure is shown. Fig.15 The base station may refer to the transmission and reception point (TRP) mentioned above.

[0719] As shown in FIG. 1515 , the base station of the present disclosure may include a transceiver 1510, a memory 1520, and a processor (or, controller) 1530. The transceiver 1510, the memory 1520, and the processor (or, controller) 1530 of the base station may operate according to the communication method of the above-mentioned base station. However, the components of the base station are not limited thereto. For example, the base station may include Fig.15 15. In addition, the processor (or controller) 1530, the transceiver 1510, and the memory 1520 may be implemented as a single chip. In addition, the processor (or controller) 1530 may include at least one processor. In addition, Fig.15 The base station corresponds to Figure 2 gNB.

[0720] The transceiver 1510 is collectively referred to as a base station receiver and a base station transmitter, and can send signals to / receive signals from a terminal, another base station, and / or a core network function (or entity). The signal sent to or received from the base station may include control information and data. The transceiver 1510 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplification and down-conversion of the frequency of the received signal. However, this is only an example of the transceiver 1510, and the components of the transceiver 1510 are not limited to the RF transmitter and the RF receiver.

[0721] In addition, the transceiver 1510 may receive a signal through a wireless channel and output the signal to the processor (or controller) 1530 , and transmit a signal output from the processor (or controller) 1530 through a wireless channel.

[0722] The memory 1520 may store programs and data required for the operation of the base station. In addition, the memory 1520 may store control information or data included in a signal obtained by the base station. The memory 1520 may be a storage medium such as a ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media.

[0723] The processor (or controller) 1530 may control a series of processes so that the base station operates as described above. For example, the processor (or controller) 1530 may receive a data signal and / or a control signal, and the processor (or controller) 1530 may determine the result of receiving a signal sent by a terminal and / or a core network function.

[0724] The methods according to the embodiments described in the claims or detailed description of the present disclosure may be implemented in hardware, software, or a combination of hardware and software.

[0725] When the electrical structure and method are implemented in software, a computer-readable recording medium having one or more programs (software modules) recorded thereon may be provided. One or more programs recorded on the computer-readable recording medium are configured to be executable by one or more processors in an electronic device. The one or more programs include instructions for executing the method according to the claims or detailed description of the present disclosure.

[0726] Those skilled in the art will appreciate that the above illustrative embodiments are described herein and are not intended to be limiting. It should be understood that any two or more of the embodiments disclosed herein can be combined in any combination. In addition, other embodiments can be utilized and other changes can be made without departing from the spirit and scope of the subject matter presented herein. It will be readily understood that the aspects of the invention of the present disclosure as generally described herein and shown in the accompanying drawings can be arranged, replaced, combined, separated and designed in various different configurations, all of which are contemplated herein.

[0727] Those skilled in the art will appreciate that the various illustrative logic blocks, modules, circuits and steps described in the present application can be implemented as hardware, software or a combination of the two. In order to clearly illustrate this interchangeability between hardware and software, various illustrative components, blocks, modules, circuits and steps are generally described above in the form of their functional set. Whether such a functional set is implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. The technician can implement the described functional set in different ways for each specific application, but such design decisions should not be interpreted as causing a departure from the scope of the present application.

[0728] The various illustrative logical blocks, modules, and circuits described in this application may be implemented or performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in cooperation with a DSP core, or any other such configuration.

[0729] The steps of the method or algorithm described in this application can be directly embodied in hardware, in a software module executed by a processor, or in a combination thereof. The software module can reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read and write information from / to the storage medium. In an alternative, the storage medium can be integrated into the processor. The processor and the storage medium can reside in an ASIC. The ASIC can reside in a user terminal. In an alternative, the processor and the storage medium can reside in a user terminal as discrete components.

[0730] In one or more exemplary designs, these functions can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, each function can be stored on or delivered by a computer-readable medium as one or more instructions or codes. Computer-readable media include both computer storage media and communication media, the latter including any media that facilitates the sending of computer programs from one place to another. Storage media can be any available media that can be accessed by a general or special purpose computer.

[0731] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention, which is determined by the appended claims.

[0732] Although the drawings show different examples of user equipment, various changes may be made to the drawings. For example, the user equipment may include any number of each component in any suitable arrangement. Generally, the drawings do not limit the scope of the present disclosure to any particular configuration. In addition, although the drawings show operating environments in which various user equipment features disclosed in this patent document may be used, these features may be used in any other suitable system.

[0733] Although the present disclosure has been described with exemplary embodiments, various changes and modifications may be conceived by those skilled in the art. The present disclosure is intended to cover these changes and modifications that fall within the scope of the appended claims. The description in this application should not be interpreted as implying that any specific element, step or function is an essential element that must be included in the scope of the claims. The scope of the patent subject matter is defined by the claims.

Claims

1. A user equipment (UE) in a wireless communication system, the UE include: A transceiver configured to receive information about a channel state information (CSI) report, the information indicating N trp CSI reference signal (CSI-RS) resources, where N trp >1; and a processor operably coupled to the transceiver, the processor being configured based on the information to: Measurement N trp CSI-RS resources, and Determine and N≤N trp CSI reports associated with CSI-RS resources, where N∈{1,2,…,N trp },in: The CSI report includes the strongest coefficient indicator (SCI) for each layer l (SCI l ), SCI l instruct the index of the strongest coefficient among the coefficients, l∈{1,…,υ} is the layer index, v≥1 is the rank value, and is the total number of non-zero coefficients of layer l associated with the CSI-RS port corresponding to N CSI-RS resources, and The transceiver is further configured to send the CSI report.

2. The UE according to claim 1, in, SCI l The payload is: When v = 1, bits, and When v>1, Bit, Among them, K NZ is the total number of nonzero coefficients.

3. The UE according to claim 1, in: The processor is further configured to determine two first amplitude coefficients for each layer l=1, ..., v, One of the two first amplitude coefficients corresponds to a first set of coefficients, The remaining one of the two first amplitude coefficients corresponds to the second set of coefficients, The first set of coefficients includes coefficients having indices i r =0,1,…,L r Second amplitude coefficient of -1 The second set of coefficients includes coefficients having indices i r =L r ,L r +1,…,2L r Second amplitude coefficient of -1 as well as L r is the number of spatial domain (SD) basis vectors of CSI-RS resource r, m is the index of the frequency domain (FD) vector, and r=1,2..,N.

4. The UE according to claim 3, in: For each layer l=1,2,…,v, corresponding to the second amplitude coefficient One of the two first amplitude coefficients of the group of the strongest coefficients is set to 1, said one of said two first amplitude coefficients is not reported, and The remaining one of the two first magnitude coefficients is reported.

5. The UE according to claim 4, in: For each layer l=1, ..., v, the CSI report also includes an indicator, the indicator indicates the reported one of the two first amplitude coefficients, and The size of the indicator is 4 bits, indicating one of the, Among them, R represents the reserved state.

6. The UE according to claim 1, in: The processor is further configured to determine, for each layer l=1, ..., v, 2N first amplitude coefficients, Each of the 2N first amplitude coefficients corresponds to the kth group of coefficients, k=1, 2, ..., 2N, The (2r-1)th group of coefficients includes the coefficients with index i r =0,1,…,l r Second amplitude coefficient of -1 The (2r)th set of coefficients includes the coefficients with index i r = l r ,L r +1,…,2L r Second amplitude coefficient of -1 as well as L r is the number of spatial domain (SD) basis vectors of CSI-RS resource r, m is the index of the frequency domain (FD) vector, and r=1,2..,N.

7. The UE according to claim 6, in: For each layer l=1,2,…,v, corresponding to the second amplitude coefficient One of the 2N first amplitude coefficients of the group of the strongest coefficients is set to 1, not reporting said one of said 2N first amplitude coefficients, Report the remaining 2N-1 first magnitude coefficients, For each layer l=1, ..., v, the CSI report also includes an indicator, The indicator indicates each of the remaining 2N-1 first amplitude coefficients, and The size of the indicator is 4 bits, indicating one of the, Where R represents the reserved state.

8. A base station (BS) in a wireless communication system, the BS include: A processor configured to identify information about a channel state information (CSI) report, the information indicating N trp CSI reference signal (CSI-RS) resources, where N trp >1; and a transceiver operably coupled to the processor, the transceiver being configured to: Send information about CSI reports; and Receives a strongest coefficient indicator (SCI) for each layer l (SCI l ) of the CSI report, where: The CSI report is with N≤N trp CSI-RS resources are associated, where N∈{1,2,…,N trp }, The SCI l instruct the index of the strongest coefficient among the coefficients, and l∈{1,…,v} is the layer index, v≥1 is the rank value, and is the total number of non-zero coefficients of layer 1 associated with the CSI-RS ports corresponding to the N CSI-RS resources.

9. The BS according to claim 8, in, SCI l The payload is: When v = 1, bits, and When v>1, Bit, Among them, K NZ is the total number of nonzero coefficients.

10. The BS according to claim 8, in: Two first amplitude coefficients are associated with each layer l=1,…,v, One of the two first amplitude coefficients corresponds to a first set of coefficients, The remaining one of the two first amplitude coefficients corresponds to the second set of coefficients, The first set of coefficients includes coefficients having indices i r =0,1,…,L r Second amplitude coefficient of -1 The second set of coefficients includes coefficients having indices i r =L r ,L r +1,…,2L r Second amplitude coefficient of -1 as well as L r is the number of spatial domain (SD) basis vectors of CSI-RS resource r, m is the index of the frequency domain (FD) vector, and r=1,2..,N.

11. The BS according to claim 10, in: For each layer l=1,2,…,v, corresponding to the second amplitude coefficient One of the two first amplitude coefficients of the group of the strongest coefficients is set to 1, said one of said two first amplitude coefficients is not reported, and The remaining one of the two first magnitude coefficients is reported.

12. The BS according to claim 11, in: For each layer l=1, ..., v, the CSI report also includes an indicator, the indicator indicates the reported one of the two first amplitude coefficients, and The size of the indicator is 4 bits, indicating one of the, Among them, R represents the reserved state.

13. The BS according to claim 8, in: 2N first amplitude coefficients are associated with each layer l=1,…,v, Each of the 2N first amplitude coefficients corresponds to the kth group of coefficients, k=1, 2, ..., 2N, The (2r-1)th group of coefficients includes the coefficients with index i r =0,1,…,L r Second amplitude coefficient of -1 The (2r)th set of coefficients includes the coefficients with index i r =L r ,L r +1,…,2L r Second amplitude coefficient of -1 as well as L r is the number of spatial domain (SD) basis vectors of CSI-RS resource r, m is the index of the frequency domain (FD) vector, and r = 1, 2.., N, For each layer l = 1, 2, ..., v, corresponding to the second amplitude coefficient One of the 2N first amplitude coefficients of the group of the strongest coefficients is set to 1, not reporting said one of said 2N first amplitude coefficients, Report the remaining 2N-1 first magnitude coefficients, For each layer l=1, ..., v, the CSI report also includes an indicator, The indicator indicates each of the remaining 2N-1 first amplitude coefficients, and The size of the indicator is 4 bits, indicating one of the, Where R represents the reserved state.

14. A method performed by a user equipment (UE) in a wireless communication system, the method include: Receive information about a channel state information (CSI) report, the information indicating N trp CSI reference signal (CSI-RS) resources, where N trp >1; Based on the information: Measurement N trp CSI-RS resources; and Determine and N≤N trp CSI reports associated with CSI-RS resources, where N∈{1,2,…,N trp } in: The CSI report includes the strongest coefficient indicator (SCI) for each layer l (SCI l ), The SCI l instruct the index of the strongest coefficient among the coefficients, l∈{1,…,ν} is the layer index, ν≥1 is the rank value, and is the total number of non-zero coefficients of layer 1 associated with the CSI-RS ports corresponding to the N CSI-RS resources; and Send the CSI report.

15. A method performed by a base station (BS) in a wireless communication system, the method include: Identify information about a channel state information (CSI) report, the information indicating N trp CSI reference signal (CSI-RS) resources, where N trp >1; and Send information about CSI reports; and The CSI report includes a strongest coefficient indicator (SCI) for each layer l. l ),in: The CSI report is with N≤N trp CSI-RS resources are associated, where N∈{1,2,…,N trp }, The SCI l instruct the index of the strongest coefficient among the coefficients, and l∈{1,…,v} is the layer index, v≥1 is the rank value, and is the total number of non-zero coefficients of layer 1 associated with the CSI-RS ports corresponding to the N CSI-RS resources.

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