CSI codebook for multiple transmit receive point operation in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Specifically, the present disclosure relates to 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 CSI reports associated with Ntrp antenna port groups, where Ntrpgt; 1; and determining, based on the information, a CSI report associated with N < = Ntrp antenna port groups, where N belongs to {2, 3,..., Ntrp}, where the CSI report comprises a first indicator indicating, for each layer l = 1,..., v, an index of Mv vectors comprising a column of a frequency domain (FD) basis matrix Wf, l, where v > = 1 is a rank value; and a second indicator indicating an index of the FD offset value # imgabs0 # for each of the N antenna port groups, where r belongs to {1,..., N}, r is not equal to r *, and r * is an index of the reference antenna port group. The method also includes transmitting a CSI report including the first indicator and the second indicator.

Description

Technical Field

[0001] The present disclosure relates generally to wireless communication systems, and more particularly, to electronic devices and methods for channel state information (CSI) codebooks for coherent joint transmission (C-JT) of multiple transmit receive points (TRPs) in wireless networks. 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 millimeter waves (mmWave) including 28 GHz and 39 GHz. In addition, it has been considered to implement 6G mobile communication technology (called Beyond 5G System) in the terahertz (THZ) frequency band (e.g., 95 GHz to 3 THz frequency band) in order to achieve a transmission rate 50 times faster than 5G mobile communication technology and an ultra-low latency of one tenth of 5G.

[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 and low-latency communication (URLLC), and massive machine type communication (mMTC), standardization is underway on the following technologies: beamforming and massive MIMO for mitigating radio wave path loss and increasing radio wave transmission distance in millimeter waves, support for parameter sets (e.g., operating multiple subcarrier intervals) for efficient utilization of millimeter wave resources and dynamic operation of time slot formats, initial access technology 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-scale data transmission and polar codes for highly reliable transmission of control information, L2 preprocessing, and network slicing for providing dedicated networks dedicated to specific services.

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

[0005] In addition, in terms of air interface architecture / protocol, standardization is being conducted on technologies such as the Industrial Internet of Things (IIoT) for supporting new services through interworking and integration 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 enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access (NR's 2-step RACH) for simplifying the random access procedure. Standardization is also being conducted on technologies such as the 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software defined network (SDN) technologies, and mobile edge computing (MEC) for receiving services based on UE location.

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

[0007] Furthermore, such development of 5G mobile communication systems will serve as a foundation for developing not only new waveforms for providing coverage in the terahertz band 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 coverage of terahertz band signals, high-dimensional spatial multiplexing technologies using OAM (orbital angular momentum), and RIS (reconfigurable smart surfaces), but also full-duplex technologies for improving the frequency efficiency of 6G mobile communication technology and improving system networks, AI-based communication technologies for achieving system optimization by utilizing satellites and AI from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technologies for achieving services with a complexity level that exceeds the operational capability limits of UEs by utilizing ultra-high performance communication and computing resources. Summary of the invention

[0008] Technical issues

[0009] The present disclosure relates to a wireless communication system, and more particularly, to an apparatus and method for a CSI codebook for a multi-TRPC-JT operation in a wireless communication system.

[0010] Solution to the problem

[0011] In one embodiment, a user equipment (UE) is provided. The UE includes a transceiver configured to receive information about an N trp The CSI report information associated with the antenna port groups, where N trp >1. The UE further includes a processor operatively coupled to the transceiver. The processor is configured to determine, based on the information, trp CSI reports associated with antenna port groups, where N∈{2,3,…,N trp The CSI report includes a first indicator and a second indicator, wherein for each layer l=1,…,v, the first indicator indicates a frequency domain (FD) basis matrix W f,l M of the column v The index of the vector, wherein v≥1 is the rank value; and the second indicator indicates the FD offset value of each of the N antenna port groups. The index of r∈{1,…,N}, r≠r * And r * is an index of the reference antenna port group. The transceiver is further configured to send a CSI report including the first indicator and the second indicator. The FD base matrix associated with the rth antenna port group is based on W f,l and Sure.

[0012] In another embodiment, a base station (BS) is provided. The BS includes a processor configured to identify information about an N trp The CSI report information associated with the antenna port groups, where N trp >1. The BS also includes a transceiver operatively coupled to the processor, the transceiver configured to send information and receive information related to N≤N trp CSI reports associated with antenna port groups, where N∈{2,3,…,N trp The CSI report includes a first indicator and a second indicator, wherein for each layer l=1,…,v, the first indicator indicates that the FD basis matrix W f,l M of the column v The index of the vector, wherein v≥1 is the rank value; and the second indicator indicates the FD offset value of each of the N antenna port groups. The index of r∈{1,…,N}, r≠r * And r * is the index of the reference antenna port group. The FD basis matrix associated with the rth antenna port group is based on W f,l and Sure.

[0013] In yet another embodiment, a method performed by a UE is provided. The method includes receiving information about an Ntrp The CSI report information associated with the antenna port groups, where N trp >1; and based on this information, determine trp CSI reports associated with antenna port groups, where N∈{2,3,…,N trp The CSI report includes a first indicator and a second indicator, wherein for each layer l=1,…,v, the first indicator indicates that the FD basis matrix W f,l M of the column v The index of the vector, where v≥1 is the rank value, and the second indicator indicates the FD offset value of each of the N antenna port groups The index of r∈{1,…,N}, r≠r * And r * is the index of the reference antenna port group. The method also includes sending a CSI report including the first indicator and the second indicator. The FD base matrix associated with the rth antenna port group is based on W f,l and Sure.

[0014] Other technical features may be apparent to those skilled in the art from the following drawings, descriptions and claims.

[0015] Advantageous Effects of the Invention

[0016] Aspects of the present disclosure provide an efficient communication method in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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:

[0018] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown;

[0019] Figure 2 An example gNodeB (gNB) according to an embodiment of the present disclosure is shown;

[0020] Figure 3 An example user equipment (UE) according to an embodiment of the present disclosure is shown;

[0021] Figure 4 An example antenna block or array for forming a beam according to an embodiment of the present disclosure is shown;

[0022] Figure 5 An example distributed multiple-input multiple-output (MIMO) system according to an embodiment of the present disclosure is shown;

[0023] Figure 6 An example distributed MIMO system according to an embodiment of the present disclosure is shown;

[0024] Figure 7 An example antenna port layout according to an embodiment of the present disclosure is shown;

[0025] Figure 8 shows a 3D grid of oversampled discrete Fourier transform (DFT) beams according to an embodiment of the present disclosure;

[0026] Fig. 9 Two new codebooks according to embodiments of the present disclosure are shown;

[0027] 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;

[0028] Fig.11 An example distributed MIMO system is shown in which each TRP has multiple antenna panels according to an embodiment of the present disclosure;

[0029] Fig.12 An example distributed MIMO system is shown, wherein each TRP can be a single panel or multiple panels, according to an embodiment of the present disclosure;

[0030] Fig.13 An example method performed by a UE in a wireless communication system according to an embodiment of the present disclosure is shown;

[0031] Fig.14 A block diagram of a terminal (or user equipment (UE)) according to an embodiment of the present disclosure is shown; and

[0032] Fig.15 A block diagram of a base station according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0033] Therefore, an embodiment of the present invention is to provide a user equipment (UE) in a wireless communication system, the UE comprising a transceiver and a processor operably coupled to the transceiver, wherein the transceiver is configured to receive information about an N trp The information of the channel state information (CSI) report associated with the antenna port groups, where N trp >1. The processor is configured to determine based on the information that N≤N trp CSI reports associated with antenna port groups, where N∈{2,3,…,N trp}, wherein the CSI report includes a first indicator and a second indicator, wherein for each layer l=1,…,v, the first indicator indicates a frequency domain (FD) basis matrix W f,lM of the column v The index of a vector, where v≥1 is the rank value; the second indicator indicates the FD offset value of each of the N antenna port groups. The index of r∈{1,…,N}, r≠r * And r * is an index of the reference antenna port group. In addition, the transceiver is further configured to send a CSI report including the first indicator and the second indicator. In addition, the FD base matrix associated with the rth antenna port group is based on W f,l and Sure.

[0034] In an embodiment, by the UE, the FD basis matrix associated with the rth antenna port group is given by Given, where Based on the FD offset value To rotate M v The rotation vector of a vector.

[0035] In an embodiment, by the UE, N 3 It is M v The length of each of the vectors, and O 3 ≥1 is the oversampling factor.

[0036] In an embodiment, by UE, wherein when O 3 =1, And the payload of the second indicator is (N-1) bits.

[0037] In an embodiment, by the UE, Among them, X<N 3 O 3 is the maximum value of the FD offset value, and the payload of the second indicator is (N-1) bits.

[0038] In an embodiment, by UE, when O 3 =4, And the payload of the second indicator is (N-1) bits.

[0039] In an embodiment, the transceiver is further configured, by the UE, to send an indication that the UE is capable of supporting 0 3 =4 UE capability information.

[0040] In an embodiment, the information includes information about N trpNZP CSI-RS resource information, each NZP CSI-RS resource is associated with N trp The processor is further configured to measure N trp NZP CSI-RS resources are used and the CSI report is determined based on the measurements.

[0041] Therefore, an embodiment of the present invention is to provide a base station (BS). The BS includes a processor and a transceiver operatively coupled to the processor, wherein the processor is configured to identify information about an N trp The information of the channel state information (CSI) report associated with the antenna port groups, where N trp > 1. The transceiver is configured to send information and receive information with N≤N trp CSI reports associated with antenna port groups, where N∈{2,3,…,N trp In addition, the CSI report includes a first indicator and a second indicator, wherein, for each layer l=1,…,v, the first indicator indicates a frequency domain (FD) basis matrix W f,l M of the column v The index of the vector, wherein v≥1 is the rank value; and the second indicator indicates the FD offset value of each of the N antenna port groups. The index of r∈{1,…,N}, r≠r * And r * is the index of the reference antenna port group, where the FD basis matrix associated with the rth antenna port group is based on W f,l and Sure.

[0042] In an embodiment, by the BS, the FD basis matrix associated with the rth antenna port group is given by Given, where Based on the FD offset value To rotate M v The rotation vector of a vector.

[0043] In an embodiment, by BS, N 3 It is M v The length of each of the vectors, and O 3 ≥1 is the oversampling factor.

[0044] In an embodiment, by BS, wherein when O 3 =1, And the payload of the second indicator is (N-1) bits.

[0045] In an embodiment, by BS, Among them, X<N 3 O 3 is the maximum value of the FD offset value, and the payload of the second indicator is (N-1) bits.

[0046] In an embodiment, by BS, when O 3 =4, And the payload of the second indicator is (N-1) bits.

[0047] In an embodiment, the transceiver is further configured, by the BS, to receive from a user equipment (UE) an indication that the UE is capable of supporting 3 =4 UE capability information.

[0048] In an embodiment, the information includes information about N trp NZP CSI-RS resource information, each NZP CSI-RS resource is associated with N trp The CSI report is associated with one of the N antenna port groups, and trp NZP CSI-RS resources are associated.

[0049] Therefore, an embodiment of the present invention is to provide a method performed by a user equipment (UE). The method includes receiving information about an N trp The CSI report information associated with the antenna port groups, where N trp >1. In addition, the method includes determining, based on the information, trp CSI reports associated with antenna port groups, where N∈{2,3,…,N trp The CSI report includes a first indicator and a second indicator, wherein for each layer l=1,…,v, the first indicator indicates a frequency domain (FD) basis matrix W f,l M of the column v The index of the vector, where v≥1 is the rank value, and the second indicator indicates the FD offset value of each of the N antenna port groups The index of r∈{1,…,N}, r≠r * And r * is an index of the reference antenna port group. In addition, the method includes sending a CSI report including the first indicator and the second indicator. In addition, the FD base matrix associated with the rth antenna port group is based on W f,l and Sure.

[0050] In an embodiment, the FD basis matrix associated with the rth antenna port group is given by To give, where Based on the FD offset value To rotate M v The rotation vector of a vector.

[0051] In an embodiment, N 3 It is M v The length of each of the vectors, and o 3 ≥1 is the oversampling factor.

[0052] In an embodiment, when O 3 =1, And the payload of the second indicator is (N-1) bits.

[0053] Invented Pattern

[0054] Fifth generation (5G) or new radio (NR) mobile communications have been gathering more and more momentum recently with all the global technical activities from industry and academia regarding various candidate technologies. Candidate enablers for 5G / NR mobile communications include massive antenna technologies from traditional cellular frequency bands to high frequencies to provide beamforming gain and support increased capacity, new waveforms (e.g., new radio access technologies (RATs)) to flexibly accommodate various services / applications with different requirements, new multiple access schemes to support massive connections, and so on.

[0055] Before proceeding to the following detailed description, it may be advantageous to set forth the definitions of certain words and phrases used in 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 include direct and indirect communication. The terms "include" and "comprise" and their derivatives mean unlimited inclusion. The term "or" is inclusive, meaning and / or. The phrase "associated with..." and its derivatives refer to including, being included in, interconnected with, including, being included in, connected to or connected with, coupled to or coupled with, communicable with, cooperating with, interweaving, juxtaposing, approaching, being combined with or combined with, having, having... attributes, having a relationship with or having a relationship with, etc. The term "controller" refers to any device, system or part thereof that controls at least one operation. Such a controller can be implemented with hardware or a combination of hardware and software and / or firmware. The functions associated with any particular controller can be centralized or distributed, whether local or remote. When used with a list of items, the phrase "at least one of" means that different combinations of one or more of the listed items may be used, and only one of the items in the list may be needed. For example, "at least one of A, B, and C" includes any combination of: A, B, C, A and B, A and C, B and C, and A, B, and C.

[0056] 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 parts thereof 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 disc (CD), a digital video disc (DVD) or any other type of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media that can permanently store data and media that can store data and overwrite it later, such as rewritable optical discs or erasable storage devices.

[0057] 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.

[0058] Discussed below Figures 1 to 15 , and the various embodiments used in this patent document to describe the principles of the present disclosure are merely exemplary and should not be interpreted in any way to limit 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 suitably arranged system or device.

[0059] 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 "Reference 1"); 3GPP TS 36.212 v17.2.0, "E-UTRA, Multiplexing and Channel coding" (hereinafter referred to as "Reference 2"); 3GPP TS 36.213 v17.2.0, "E-UTRA, Physical Layer Procedure" (hereinafter referred to as "Reference 3"); 3GPP TS 36.321 v17.1.0, "E-UTRA, Medium Access Control (MAC) protocol specification" (hereinafter referred to as "Reference 4"); 3GPP TS 3GPP TS 38.214v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “Reference 8”); 3GPP TS 38.215v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “Reference 9”); 3GPP TS 38.216v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “Reference 10”); 3GPP TS 38.217v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “Reference 11”); 3GPP TS 38.218v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “Reference 12”); 3GPP TS 38.219v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “Reference 13”); 3GPP TS 38.211v17.2.0, “NR, Physical channels and modulation” (hereinafter referred to as “Reference 14”); 3GPP TS 38.212v17.2.0, “NR, Multiplexing and Channel coding” (hereinafter referred to as “Reference 15”); 3GPP TS 38.213v17.2.0, “NR, Physical Layer Procedures for Control” (hereinafter referred to as “Reference 16”); Data (NR, physical layer process of data)" (referred to as "reference 9" in this article); 3GPP TS 38.215v17.1.0, "NR, Physical Layer Measurements (NR, physical layer measurement)" (referred to as "reference 10" in this article); 3GPP TS 38.321v17.1.0, "NR, Medium Access Control (MAC) protocol specification" (hereinafter referred to as "Reference 11"); 3GPP TS 38.331v17.1.0, "NR, Radio Resource Control (RRC) Protocol Specification" (hereinafter referred to as "Reference 12"). .

[0060] Wireless communication is 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 smartphones and other mobile data devices (such as tablets, "notepad" computers, netbooks, e-book readers and machine-type devices) among consumers and enterprises, the demand for wireless data services is growing rapidly. In order to meet the high growth of mobile data services and support new applications and deployments, improving radio interface efficiency and coverage is critical.

[0061] In order to meet the increased demand for wireless data services 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 high-frequency (millimeter wave) bands (e.g., 28 GHz or 60 GHz bands) to achieve high data rates, or in low-frequency bands (such as 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.

[0062] 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.

[0063] 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 higher versions of deployments that may use terahertz (THz) frequency bands.

[0064] The following Figures 1 to 3 Various embodiments are described that are implemented in a wireless communication system and using Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication techniques. Figures 1 to 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.

[0065] 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.

[0066] 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).

[0067] 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 includes 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.

[0068] 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 (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 wirelessly enabled devices. A 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), Advanced LTE (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 document 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).

[0069] 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 gNBs, 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.

[0070] As described in more detail below, one or more of UEs 111-116 include circuits, programs, or a combination thereof for supporting CSI codebooks for coherent joint transmission of multiple TRPs. In certain embodiments, one or more of BSs 101-103 include circuits, programs, or a combination thereof for supporting CSI codebooks for coherent joint transmission of multiple TRPs.

[0071] 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 wireless broadband access to network 130 to these UEs. Similarly, each gNB 102-103 may communicate directly with network 130 and provide direct wireless broadband access to network 130 to the UEs. 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.

[0072] Figure 2 An example gNB 102 is shown according to an embodiment of the present disclosure. Figure 2 The embodiment of gNB 102 shown is for illustration only, and Figure 1 gNBs 101 and 103 may have the same or similar configurations. However, gNBs have various configurations, and Figure 2 There is no intent to limit the scope of this disclosure to any particular implementation of a gNB.

[0073] 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.

[0074] The transceivers 210a-210n receive incoming RF signals from the antennas 205a-205n, such as signals transmitted by UEs in the network 100. The transceivers 210a-210n downconvert the incoming 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.

[0075] The controller / processor 225 and / or transmit (TX) processing circuitry in the transceivers 210a-210n receive analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 225. The TX processing circuitry encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The transceivers 210a-210n up-convert the baseband or IF signal to an RF signal that is transmitted via the antennas 205a-205n.

[0076] 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 outgoing / incoming signals from / to multiple antennas 205a-205n are weighted differently to effectively direct the outgoing signals in a desired direction. As another example, the controller / processor 225 may support methods for CSI codebooks to support coherent joint transmission of multiple TRPs. The controller / processor 225 may support any of a variety of other functions in the gNB 102.

[0077] The controller / processor 225 is also capable of executing programs and other processes, such as an OS, that reside in the memory 230. The controller / processor 225 may move data into or out of the memory 230 as required by the executing process.

[0078] 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 network. The interface 235 can support communication over 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 can 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 can 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 over a wired or wireless connection, such as Ethernet or a transceiver.

[0079] Memory 230 is coupled to controller / processor 225. Portions of memory 230 may include RAM, while other portions of memory 230 may include flash memory or other ROM.

[0080] although Figure 2 An example of a gNB 102 is shown, but the Figure 2 For example, gNB 102 may include Figure 2 Any quantity of each component shown. In addition, Figure 2 The various components in may be combined, further subdivided, or omitted, and additional components may be added according to specific needs.

[0081] 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 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 a UE.

[0082] 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.

[0083] Transceiver 310 receives incoming RF signals from antenna 305 transmitted by a gNB of network 100. Transceiver 310 downconverts the incoming RF signals 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).

[0084] 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 outgoing baseband data (such as network data, email, or interactive video game data) from the processor 340. The TX processing circuit encodes, multiplexes, and / or digitizes the outgoing 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.

[0085] 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, according to well-known principles, the processor 340 may control the transceiver 310 to receive DL channel signals and transmit UL channel signals. As another example, the processor 340 may support a method for receiving multiple TRP coherent joint transmissions using a CSI codebook. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.

[0086] The processor 340 is also capable of executing other processes and programs resident in the memory 360. 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.

[0087] Processor 340 is also coupled to input 350 including, for example, a touch screen, a keyboard, 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.

[0088] Memory 360 is coupled to processor 340. Portions of memory 360 may include random access memory (RAM), while other portions of memory 360 may include flash memory or other read-only memory (ROM).

[0089] although Figure 3 An example of UE 116 is shown, but the Figure 3 Make various changes. For example, Figure 3 The various components in may be combined, further subdivided, or omitted, and additional components may be added as required. 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.

[0090] 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.

[0091] Figure 4 An example antenna block or array 400 is shown in accordance with an embodiment of the present disclosure. Figure 4The illustrated embodiment of antenna block or array 400 is for illustration only. Figure 4 The scope of the present disclosure is not limited to any particular implementation of antenna blocks or arrays.

[0092] 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 by hardware constraints (such as the feasibility of installing a large number of ADCs / DACs at mmWave frequencies), e.g. 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 group of analog phase shifters 401. Then, one CSI-RS port can correspond to a subarray, which produces a narrow analog beam 405 through analog beamforming. By changing the phase shifter group across symbols or subframes, the analog beam can be configured to sweep across a wider angle 420. 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 is the same as N CSI-PORT A linear combination is performed between the analog beams 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.

[0093] Since the above-described system utilizes multiple simulated beams for transmission and reception (wherein one or a few simulated beams are selected from a large number of simulated beams—performed from time to time, for example, after a training duration), the term "multi-beam operation" is used to refer to the overall system aspect. For the purposes of this description, this includes indicating an assigned DL or UL transmit (TX) beam (also referred to as "beam indication"), measuring at least one reference signal used to calculate and perform beam reporting (referred to as "beam measurement" and "beam reporting", respectively), and receiving a DL or UL transmission by selecting a corresponding receive (RX) beam.

[0094] The above system is also applicable to higher frequency bands, such as frequencies greater than 52.6 GHz (also known as FR4). In this case, the system can only use analog beams. 2 Absorption losses (up to 10 dB of additional loss per 100 m of distance) require larger and sharper simulated beams (hence a greater number of radiators in the array) to compensate for the additional path loss.

[0095] On the other hand, at low frequency bands (such as frequencies below 1 GHz), the number of antenna elements may not be very large at a given form factor due to the longer wavelength. For example, for the case of wavelength size (λ) at a center frequency of 600 MHz, which is 50 cm, 4 m is required for a Uniform-Linear-Array (ULA) antenna panel of 16 antenna elements with a half-wavelength distance between two adjacent antenna elements. Considering that in actual practice multiple antenna elements are mapped to one digital port, the ideal 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, which makes it difficult to deploy a 2-D antenna element array within the size of a traditional form factor. This results in a limited number of CSI-RS ports that can be supported by a single site and limits the spectral efficiency of such a system.

[0096] 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 high 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 to, for example, 8. This limits the spectral efficiency of such a system. Specifically, the MU-MIMO spatial multiplexing gain provided by the large number of CSI-RS antenna ports (e.g., 32) cannot be achieved.

[0097] One approach to operating a sub-1GHz 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 station unit, so the signals sent / received via multiple distributed TRPs / RRSs can still be processed at a centralized location. This is called distributed MIMO or multi-TRP coherent joint transmission (C-JT).

[0098] Various embodiments of the present disclosure recognize that the CSI enhancement described in Rel-18 MIMO considers the refinement of the Rel-16 / 17 type-IICSI codebook 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 , W 2 and W fVarious embodiments of the present disclosure recognize that, based on three components, an mTRP codebook needs to be specified in Rel-18. In addition, various embodiments of the present disclosure recognize that due to power imbalance across TRPs, W across TRPs 2 The CSI coefficients in can have different reference amplitude values. Various embodiments of the present disclosure recognize that there is a need to support a component in Rel-18 for indicating reference values ​​across TRPs.

[0099] Therefore, various embodiments of the present disclosure provide components for indicating reference values, and propose reports for W1 / W2 / Wf for multi-TRP C-JT scenarios. In addition, various embodiments of the present disclosure consider multi-TRP C-JT scenarios, and propose methods and devices for CSI reporting in multi-TRP C-JT scenarios. In addition, various embodiments of the present disclosure provide a method for mTRP coherent joint transmission (C-JT) based on three components W 1 , W 2 and W f Components of the mTRP codebook.

[0100] Figure 5 An example distributed MIMO system 500 is shown in accordance with an embodiment of the disclosure. Figure 5 The embodiment of distributed MIMO system 500 shown in FIG. 5 is for illustration only. Figure 5 The scope of the present disclosure is not limited to any particular implementation of distributed MIMO system 500 .

[0101] 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 a single site), and distribute multiple panels in multiple locations / sites (or TRPs, RRHs). Figure 5 shown.

[0102] Figure 6 An example distributed MIMO system 600 is shown in accordance with an embodiment of the present disclosure. Figure 6 The embodiment of distributed MIMO system 600 shown in FIG. 6 is for illustration only. Figure 6 The scope of the present disclosure is not limited to any particular implementation of distributed MIMO system 600 .

[0103] 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 a single base unit.

[0104] Note that although the present disclosure mentions low-band systems (sub-1GHz band) as the motivation for distributed MIMO (or mTRP), distributed MIMO technology is frequency-band-agnostic and can be useful in mid-band (sub-6GHz) and high-band (above 6GHz) systems in addition to low-band (sub-1GHz) systems.

[0105] The term “distributed MIMO” is used for illustrative purposes, it may be considered under other terms such as multi-TRP, mTRP, cellular-free network, etc.

[0106] 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 in time is a subframe (which may be composed of one or more time slots) or a time slot, all the following components and embodiments are applicable to UL transmission.

[0107] 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.

[0108] A subband for CSI reporting is defined as a set of contiguous PRBs, which represents the smallest frequency unit for CSI reporting. For a given DL system bandwidth value, the number of PRBs in a subband can be fixed, semi-statically configured via higher layer / RRC signaling, or dynamically configured via L1 DL control signaling or MAC control element (MAC CE). The number of PRBs in a subband can be included in the CSI reporting settings.

[0109] A "CSI reporting band" is defined as a set / set of contiguous or non-contiguous subbands in which CSI reporting is performed. For example, a CSI reporting band may include all subbands 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 subbands within the DL system bandwidth. This may also be referred to as a "partial band".

[0110] 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.

[0111] In terms of UE configuration, the UE may be configured with at least one CSI reporting band. This configuration may be semi-static (via high-layer signaling or RRC) or dynamic (via MAC CE or L1 DL control signaling). When configured with multiple (N) CSI reporting bands (e.g., via RRC signaling), the UE may report CSI associated with n≤N CSI reporting bands. For example, a large system bandwidth of >6 GHz 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 L1 DL control signaling). Alternatively, the UE may report a recommended value of n via the UL channel.

[0112] Therefore, the CSI parameter frequency granularity for each CSI reporting band can be defined as follows. n When there are multiple subbands, the CSI parameters are configured with M n When the CSI reporting frequency band is M, the n When one CSI parameter is reported for each of the subbands, the CSI parameter is configured with M n The CSI reporting frequency band for each sub-band is the “sub-band” of the frequency band.

[0113] Figure 7 An example antenna port layout 700 is shown according to an embodiment of the present disclosure. Figure 7 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 700 .

[0114] like Figure 7 As shown, N 1 and N 2 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, N 1 >1, N 2 >1, for 1D antenna port layout, N 1 >1 and N 2 =1. Therefore, for the dual-polarized antenna port layout, when each antenna is mapped to an antenna port, the total number of antenna ports is 2N 1 N 2 . Figure 7 An example is shown, where "X" represents two antenna polarizations. In this disclosure, the term "polarization" refers to a group of antenna ports. For example, antenna ports Including the first antenna polarization, antenna port Including the second antenna polarization, where PCSIRS 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 is the number of antenna panels at the gNB. g >1), we assume that each panel has N 1 and N 2 The dual-polarized antenna port has 2 ports. Figure 7 Note that the antenna port layouts in different antenna panels may be the same or different.

[0115] In one example, the antenna architecture of a D-MIMO or CJT (coherent joint transmission) system is structured. For example, the antenna structure at each RRH (or TRP) is dual-polarized (eg Figure 7 The antenna structure at each RRH / TRP may be the same. Alternatively, the antenna structure at the RRH / TRP may be different from the other RRH / TRPs. Likewise, 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 the other RRH / TRPs. In one example, N g =N RRH , the number of RRHs / TRPs in D-MIMO transmission.

[0116] 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 other RRH / TRPs.

[0117] 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, although in practice an RRH / TRP may have multiple panels. However, this disclosure is not limited to the single panel assumption at each RRH / TRP and can be easily extended (covered) to the case where the RRH / TRP has multiple antenna panels.

[0118] In one embodiment, the RRH constitutes (or corresponds to or is equivalent to) at least one of the following:

[0119] • In one example, the RRH corresponds to the TRP.

[0120] 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 Category B, K>1 configuration in Rel.14 LTE. The K NZP CSI-RS resources may belong to a CSI-RS resource set or multiple CSI-RS resource sets (e.g., K resource sets each including one CSI-RS resource). The details are as explained earlier in this disclosure.

[0121] In one example, an RRH or TRP corresponds to a CSI-RS resource group, where a group includes one or more NZP CSI-RS resources. 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 from the resource group. This is similar to the Category B, K>1 configuration in Rel.14 LTE. The K NZP CSI-RS resources may belong to a CSI-RS resource set or multiple CSI-RS resource sets (e.g., K resource sets each including one CSI-RS resource). The details are as explained earlier in this disclosure. Specifically, the K CSI-RS resources may be divided into N RRH The information about resource grouping may be provided together with CSI-RS resource setting / configuration, or CSI report setting / configuration or CSI-RS resource configuration.

[0122] 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, which includes (or is associated with) CSI-RS ports, which can be grouped (or divided) into multiple subsets / groups / parts of antenna ports that each correspond to (or constitute) the RRH / TRP. Information about the subset of ports or the grouping of ports can be provided together with the CSI-RS resource setting / configuration, or CSI report setting / configuration or CSI-RS resource configuration.

[0123] In one example, depending on the configuration, the RRH or TRP corresponds to one or more of the above examples. For example, the configuration may be explicit via parameters (eg, RRC parameters). Alternatively, it may be implicit.

[0124] o 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.

[0125] o In another example, the configuration may be based on a 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.

[0126] In one example, when an RRH or TRP is mapped to (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 / RRS can be reported via an indicator. For example, the indicator can be a CRI or a PMI (component) or a new indicator.

[0127] In one example, when an RRH or TRP is mapped to (or corresponds to) a CSI-RS port group, the UE may select a subset of the TRP / RRH (port group) and report the CSI of the selected TRP / RRH (port group), and the selected TRP / RRH may be reported via an indicator. For example, the indicator may be a CRI or a PMI (component) or a new indicator.

[0128] In one example, when N RRH When multiple (K>1) CSI-RS resources are configured for each TRP / RRH, a decoupled (modular) codebook is used / configured, and when RRH When a single (K=1) CSI-RS resource is configured for each TRP / RRH, a joint codebook is used / configured.

[0129] 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, the entire contents of which are incorporated herein by reference, a UE is configured with high-resolution (e.g., Type II) CSI reporting, wherein a linear combination-based Type I CSI reporting framework is extended to include a frequency dimension in addition to a first antenna port dimension and a second antenna port dimension.

[0130] Figure 8 A 3D grid 800 of oversampled DFT beams is shown in accordance with an embodiment of the present disclosure. Figure 8The illustrated embodiment of the 3D grid 800 of oversampled DFT beams is for illustration only. Figure 8 The scope of the present disclosure is not limited to any particular implementation of a 3D grid of oversampled DFT beams.

[0131] As shown in the figure, Figure 8 A 3D grid 800 (first port dimension, second port dimension, frequency dimension) of an oversampled DFT beam is shown, where

[0132] The first dimension is associated with the first port dimension,

[0133] The second dimension is associated with the second port dimension, and

[0134] • The third dimension is associated with the frequency dimension.

[0135] The basis sets used for representing the first port domain and the second port domain are respectively N in length. 1 and length N 2 The oversampled DFT codebooks have oversampling factors O and 1 and O 2 Similarly, the basis set for the frequency domain representation (i.e., the third dimension) is of length N 3 With oversampling factor O 3 In one example, O 1 =O 2 =O 3 =4. In one example, O 1 =O 2 =4,O 3 =1. In another example, the oversampling factor O i belongs to {2, 4, 8}. In another example, O 1 , O 2 and O 3 At least one of them is configured by a higher layer (via RRC signaling).

[0136] As explained in section 5.2.2.2.6 of reference 8, 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 subbands (SBs) and for a given layer l=1,..,v (where v is the associated RI value) is given by either:

[0137]

[0138] or

[0139]

[0140] in:

[0141] ·N 1 is the number of antenna ports in the first antenna port dimension (with the same antenna polarization),

[0142] ·N 2 is the number of antenna ports in the second antenna port dimension (with the same antenna polarization),

[0143] ·P CSI-RS is the number of CSI-RS ports configured for the UE,

[0144] ·N 3 is the number of SBs or the number of FD units or the number of FD components (including the CSI reporting band) used for PMI reporting or the total number of precoding matrices indicated by PMI (one per FD unit / component),

[0145] ·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 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 elsewhere,

[0146] b f YesN 3 ×1 column vector,

[0147] ·c l,i,f is a complex coefficient.

[0148] In a variant, when the UE reports a subset K < 2LM coefficients (where K is fixed, configured by the gNB or reported by the UE), the coefficient c in Equation 1 or Equation 2 of the precoder equation l,i,f is replaced by x l,i,f ×c l,i,f ,in

[0149] According to some embodiments of the present disclosure, if the coefficient c l,i,f If x is reported by UE, l,i,f =1.

[0150] Otherwise (i.e., c l,i,f Not reported by UE), x l,i,f =0.

[0151] x l,i,f =1 or 0 is according to some embodiments of the present disclosure. For example, it can be via a bitmap.

[0152] In a variation, the precoder equations of Equation 1 or Equation 2 are respectively summarized as

[0153]

[0154] and

[0155]

[0156] 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 reported by the UE for a given i l,i,f The number of i ≤M(where {M i} or ∑M i is fixed, configured by the gNB or reported by the UE).

[0157] W l The columns of are normalized to norm 1. For rank R or R layers (v = R), the precoding matrix is ​​given by Given. Equation 2 is assumed in the rest of the present disclosure. However, the embodiments of the present disclosure are general and also apply to Equation 1, Equation 3, and Equation 4.

[0158] here And M≤N 3 .if Then A is the identity matrix and is not reported. Similarly, if M = N 3 , then B is the identity matrix and is therefore not reported. In one example, assume that M < N 3 , to report the columns of B, an oversampled DFT codebook is used. For example, b f =w f , where the quantity w f Given by the following formula

[0159]

[0160] When O 3 = 1, the FD basis vectors of layer l∈{1,..,v} (where v is the RI or rank value) are given by

[0161]

[0162] in, and in,

[0163] In another example, a discrete cosine transform DCT basis is used to construct / report a third dimension basis B. The mth column of the DCT compression matrix is ​​simply given by And K = N 3 , and m=0,…,N 3 -1.

[0164] Since DCT is applied to real-valued coefficients, DCT is applied to the real and imaginary parts (of the channel or channel eigenvectors) respectively. Alternatively, DCT is applied to the amplitude and phase components (of the channel or channel eigenvectors) respectively. The use of DFT or DCT basis is only for illustrative purposes. The present disclosure is applicable to any other basis vectors for constructing / reporting A and B.

[0165] At a high level, the precoder W l It can be described as follows.

[0166]

[0167] Where A = W 1 Corresponding to Rel.15W in the type IICSI codebook 1 [Reference 8], and B = W f .

[0168] The matrix includes all the required linear combination coefficients (eg, magnitude and phase or real or imaginary). 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 phase coefficient (φ l,i,f In one example, an A-bit amplitude codebook is used to report the amplitude coefficient (p l,i,f ), where A belongs to {2, 3, 4}. If multiple values ​​of A are supported, one value is configured via high-layer signaling. In another example, the amplitude coefficient (p l,i,f ) is reported as in

[0169] · is the reference or first amplitude reported using the A1 bit amplitude codebook, where A1 belongs to {2, 3, 4}, and

[0170] · is the differential or second amplitude reported using the A2-bit amplitude codebook, where A2≤A1 belongs to {2, 3, 4}.

[0171] For layer l, 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} are denoted as c l,i,f , and the strongest coefficient is expressed as The strongest coefficient is K reported using the bitmap NZ The strongest coefficient among the non-zero (NZ) coefficients, where and β is configured by higher layers. Assume that the remaining 2LM-K not reported by the UE NZ The following quantization scheme is used to quantify / report K NZ NZ coefficients.

[0172] ·for Quantization of the NZ coefficients in UE reports the following

[0173] oThe strongest coefficient index (i * ,f * ), where or

[0174] i. Strongest coefficient (hence its magnitude / phase is not reported)

[0175] oUse two antenna polarization specific reference amplitudes.

[0176] i. For the strongest coefficient The associated polarization, due to the reference amplitude Therefore, it was not reported

[0177] ii. For the other polarization, the reference amplitude quantized to 4 bits.

[0178] 1.4-bit amplitude alphabet

[0179] oFor {c l,i,f ,(i,f)≠(i * ,f * )}:

[0180] i. For each polarization, calculate the differential magnitude of the coefficient relative to the associated polarization-specific reference magnitude And quantized to 3 bits.

[0181] 1.3-bit amplitude alphabet is

[0182] 2. Note: The final quantization amplitude p l,i,f Depend on Given

[0183] ii. Each phase is quantized to 8PSK (N ph =8) or 16PSK (N ph =16) (which is configurable).

[0184] For the strongest coefficient The associated polarization * ∈{0,1}, we make And the reference amplitude For other polarizations r∈{0,1} and r≠r * , we make And the reference amplitude quantized (reported) using the 4-bit amplitude codebook described above.

[0185] In Rel.16 enhanced type II and type II port selection codebooks, the UE may be configured to report M FD basis vectors. In one example, Among them, R is based on the high-level configuration of {1, 2}, and p is based on In one example, for rank 1-2 CSI reports, the p value is configured by the higher layer. For rank > 2 (e.g., rank 3-4), the p value (given by v 0 In one example, for ranks 1-4, (p,v 0 ) is based on Joint configuration, that is, 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 v , to show its dependence on the rank value v, so p is replaced by p v , v∈{1,2}, and v 0 Replaced by p v ,v∈{3,4}.

[0186] The UE may be configured to freely (independently) report the N 3 The basis vectors are reported in one step M v Alternatively, the UE can be configured to report M FD basis vectors in two steps. v The FD basis vectors are shown below.

[0187] In step 1, select / report including N' 3 <N3 The intermediate set (InS) of basis vectors is given by , where InS is common to all layers.

[0188] In step 2, for each layer l∈{1,..,v} of the rank v CSI report, according to N′ in InS 3 The basis vectors are freely (independently) selected / reported by M v FD basis vectors.

[0189] In one example, when N 3 ≤19, the one-step method is used. 3 >19, the two-step method is used. In one example, Here, α>1 is fixed (eg, 2) or configurable.

[0190] The codebook parameters used in DFT-based frequency domain compression (Equation 5) are (L, v∈{1,2}p v , p of v∈{3,4} v , β, α, N ph ). The set of values ​​for these codebook parameters is as follows.

[0191] L: The set of values ​​is usually {2,4}, except for rank 1-2, 32 CSI-RS antenna ports and R=1, L∈{2,4,6}.

[0192] ·

[0193] ·

[0194] α=2

[0195] ·N ph =16

[0196] The set of values ​​of these codebook parameters is shown in Table 1.

[0197] [Table 1]

[0198]

[0199]

[0200] In Rel.17 (further enhanced type II port selection codebook), M∈{1,2}, Among them, K 1 =α×P CSIRS , and the codebook parameters (M, α, β) are configured according to Table 2.

[0201] [Table 2]

[0202]

[0203] The above framework (Equation 5) shows that in 2L (or K 1 ) SD beams / port and M v Multiple (N) FD beams using linear combination (double sum) 3 The precoding matrix of the FD unit is calculated by using the TD basis matrix W t Instead of 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 columns include M representing some form of delay or channel tap position. v TD beams. Therefore, the precoder W l It can be described as follows.

[0204]

[0205] In one example, from N 3 Select M from the set of TD beams v TD beams (indicating delay or channel tap position), that is, N 3 Corresponding to a 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.

[0206] In one example, the codebook for CSI reporting is according to at least one of the following examples.

[0207] • In one example, the codebook may be a Rel.15 Type I single panel codebook (see 5.2.2.2.1 of TS 38.214).

[0208] • In one example, the codebook may be a Rel.15 Type I multi-panel codebook (see 5.2.2.2.2 of TS 38.214).

[0209] • In one example, the codebook may be a Rel.15 Type II codebook (see 5.2.2.2.3 of TS 38.214).

[0210] • In one example, the codebook may be a Rel.15 port selection type II codebook (see 5.2.2.2.4 of TS 38.214).

[0211] In one example, the codebook may be a Rel.16 enhanced type II codebook (see 5.2.2.2.5 of TS 38.214).

[0212] In one example, the codebook may be the Rel.16 enhanced port selection type II codebook (see 5.2.2.2.6 of TS 38.214).

[0213] In one example, the codebook may be a Rel.17 further enhanced port selection type II codebook (see 5.2.2.2.7 of TS38.214).

[0214] • In one example, the codebook is a new codebook for C-JT CSI reporting.

[0215] o In one example, the new codebook is a decoupled codebook including the following components:

[0216] ■Intra-TRP: Per TRP Rel.16 / 17 Type II codebook components, i.e., SD basis vectors (W1), FD basis vectors (Wf), W2 components (e.g., SCI, index of NZ coefficients, and amplitude / phase of NZ coefficients).

[0217] ■Between TRPs: Same amplitude and same phase for each TRP.

[0218] o In one example, the new codebook is a joint codebook including the following components:

[0219] ■ SD basis vector per TRP (W1)

[0220] ■Single joint FD basis vector (Wf)

[0221] ■ A single joint W2 component (eg, SCI, index of NZ coefficients, and magnitude / phase of NZ coefficients).

[0222] 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 .

[0223] 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, wherein each NZP CSI-RS resource includes CSI-RS antenna ports of 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) an antenna port group.

[0224] 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.

[0225] In one example, each NZP CSI-RS resource includes the CSI-RS antenna ports of 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) an antenna port group.

[0226] • In one example, each NZP CSI-RS resource corresponds to (or is mapped to or associated with) a TRP / RRH.

[0227] In this disclosure, we use N, N TRP 、N RRH .

[0228] In one embodiment, the UE is configured with an mTRP (or D-MIMO or C-JT) codebook via a higher layer parameter codebookType, for example, set to "typeII-r18-CJT" based on a Rel-16 / 17 type II codebook design. For example, the mTRP codebook has a three-level structure, which can be represented as Among them, the component W 1 Used to report / indicate the SD basis matrix including the spatial domain (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.

[0229] In this disclosure, the following is directed to W 1 The beam selection described is used not only for SD beam selection (e.g., DFT basis vector selection) but also for port selection (e.g., v i Select, where v i is a vector with 1 for the ith element and 0 elsewhere). Port selection and beam selection can be interchangeable where appropriate.

[0230] 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 which 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.

[0231] like Fig.10 As shown, in one embodiment, each TRP has a single antenna panel. 1 There is a block diagonal structure consisting of X diagonal blocks, where 1 (copolar) or 2 (bipolar) diagonal blocks are associated with each TRP.

[0232] In one example, X=N TRP Assume a co-polarized (single polarized) antenna structure at each TRP. In one example, when N TRP =2, the component W 1 Given by:

[0233]

[0234] 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 the first rTRP L r columns or beams (or basis vectors). In one example, for all values ​​of r, L r = L (TRP common L value), for example, L∈{2, 3, 4, 6}. In one example, L r Can differ across TRPs (TRP-specific L values), e.g., L r Can take values ​​from {2, 3, 4, 6} (fixed or configured).

[0235] In one example, X=2N TRP A dual-polarization (cross-polarization) antenna structure at each TRP is assumed.

[0236] In one example, when N TRP =2, the component W 1 Given by:

[0237]

[0238] Among them, B 1 is the basis matrix of the first TRP and is common (identical) to the two polarizations corresponding to the first diagonal block and the second diagonal block, and B 2is the basis matrix for the second TRP and is common (same) for the two polarizations corresponding to the third diagonal block and the fourth diagonal block. Typically, the (2r-1)th diagonal block and the (2r)th diagonal block correspond to the two antenna polarizations of the rth TRP. In one example, Including the first rTRP L r columns or beams (or basis vectors). In one example, for all values ​​of r (TRP common L values), L r =L, for example, L∈{2, 3, 4, 6}. In one example, L r Can differ across TRPs (TRP-specific L values), e.g., L r Can take values ​​from {2, 3, 4, 6} (fixed or configured).

[0239] In one example, when N TRP =2, the component W 1 Given by:

[0240]

[0241] 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 (same) for the two polarizations corresponding to the second diagonal block and the fourth diagonal block. In general, the e-th diagonal block and the (r+N-th) diagonal block are TRP ) diagonal blocks correspond to the two antenna polarizations of the rth TRP. In one example, Including the first rTRP L r columns or beams (or basis vectors). In one example, for all r values ​​(TRP common L values), L r =L, for example, L∈{2, 3, 4, 6}. In one example, L r Can differ across TRPs (TRP-specific L values), e.g., L r Can take values ​​from {2, 3, 4, 6} (fixed or configured).

[0242] In one example, when N TRP =2, the component W 1 Given by:

[0243]

[0244] Among them, B 1,1 and B 1,2is 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 base matrix of the first antenna polarization and the second antenna polarization of 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, Including the p-polarized L of the rTRP r,p columns or beams (or basis vectors). In one example, for all r and p values ​​(TRP-common and polarization-common L values), L r = L, for example, L∈{2, 3, 4, 6}. In one example, for all p values ​​(TRP-specific and polarization-common L values), L r,p =L r In one example, for all r values ​​(TRP common and polarization specific L values), L r,p =L p In one example, L r,p Able to differ across TRPs (TRP-specific and polarization-specific L values).

[0245] In one example, when N TRP =2, the component W 1 Given by:

[0246]

[0247] Among them, B 1,1 and B 1,2 is the basis matrix of the first antenna polarization and the second antenna polarization of the first TRP, which corresponds 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 ) The diagonal blocks correspond to the two antenna polarizations of the rTRP. In one example, Including the p-polarized L of the rTRP r,p columns or beams (or basis vectors). In one example, for all r and p values ​​(TRP-common and polarization-common L values), L r = L, for example, L∈{2, 3, 4, 6}. In one example, for all p values ​​(TRP-specific and polarization-common L values), L r,p =L r In one example, for all r values ​​(TRP common and polarization specific L values), L r,p =Lp In one example, L r,p Able to differ across TRPs (TRP-specific and polarization-specific L values).

[0248] In one example, Among them, for the co-polarization (single polarization) antenna structure at the rth TRP, a r =1, and for the dual-polarization (cross-polarization) antenna structure at the rth TRP, a r =2.

[0249] In one example, when N TRP =2, the component W 1 Given by:

[0250]

[0251] Among them, B 1 is the basis matrix of the first TRP, and B 2 It is the base matrix of the second TRP and is common (identical) for two polarizations, which correspond to the second diagonal block and the third diagonal block.

[0252] In one example, when N TRP =2, the component W 1 Given by:

[0253]

[0254] 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.

[0255] 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 which 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.

[0256] like Fig.11 As shown, in one embodiment, each TRP has multiple antenna panels. 1 It has a block diagonal structure consisting of X diagonal blocks, where N g,r (Common pole) or 2N g,r(bipolar) diagonal blocks with N g,r The rth TRP of each panel is associated, and for all values ​​of r, N g,r >1. Note that for Fig.11 The two TRPs in N g,r =2.

[0257] By W 1 By adding diagonal blocks corresponding to multiple panels in , the examples in this paper can be extended in a straightforward way for this case (multiple panels at TRP).

[0258] Fig.12 An example distributed MIMO system 1200 is shown in which each TRP can have a single panel or have multiple panels according to an embodiment of the present disclosure. Fig.12 The embodiment of the distributed MIMO system 1200 shown in which each TRP can have a single panel or 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 can have a single panel or have multiple panels.

[0259] like Fig.12 As shown, in one embodiment, each TRP can have a single antenna panel or multiple antenna panels (see Fig.12 ). Component W 1 It has a block diagonal structure consisting of X diagonal blocks, where N g,r (Common pole) or 2N g,r (bipolar) diagonal blocks with N g,r When the rTRP has a single panel, N g,r = 1, when the rTRP has multiple panels, N g,r >1.

[0260] By W 1 By adding diagonal blocks corresponding to multiple panels in , the examples in this paper can be extended in a straightforward way for this case (multiple panels at TRP).

[0261] In one embodiment, the component W 1 The basis matrix of the diagonal blocks of has columns selected from the set of oversampled 2DDFT vectors. When the antenna port layout is the same across TRPs, for a given antenna port layout (N 1 ,N 2 ) and the two-dimensional oversampling factor (O 1 ,O 2 ), DFT vector v l,m It can be expressed as follows.

[0262]

[0263] Where l∈{0,1,…,O 1 N 1 -1} and m∈{0,1,…,O 2 N 2 -1}.

[0264] 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 1,r ,O 2,r ), DFT vector It can be expressed as follows.

[0265]

[0266] 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}.

[0267] In one example, the oversampling factor is common to the TRPs and therefore remains the same across TRPs. For example, 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).

[0268] 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 YesP CSI-RS / 2 element column vector, whose element contains the value 1 in and zeros elsewhere (where the first element is element 0).

[0269] When the antenna port layout can be different across TRPs, for a given number of CSI-RS ports P CSI-RS,r , port selection vector YesPCSI-RS,r / 2 element column vector, whose element contains the value 1 in and zeros elsewhere (where the first element is element 0).

[0270] In one embodiment, each TRP can have a single antenna panel or multiple antenna panels (see Fig.12 ). Component W 1 It has a block diagonal structure consisting of X=2 diagonal blocks, where N g,r (Common pole) or 2N g,r (bipolar) diagonal blocks with N g,r When the rTRP has a single panel, N g,r = 1, when the rTRP has multiple panels, N g,r >1.

[0271] In the following, the term polarization is used to indicate 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.

[0272] Hereinafter, TRP can refer to a CSI-RS resource (configured for channel measurement) or a CSI-RS port group within a CSI-RS resource (including multiple CSI-RS port groups).

[0273] In one embodiment, the component W 1 It is TRP common port selection (or TRP common SD base beam selection), that is, the same set of ports is selected for all TRPs.

[0274] 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, both antenna polarizations, and all layers). 1 Can be expressed as:

[0275]

[0276] 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, W 1 =diag(B,B,B,B), where diag(A,B,C,…) is a block diagonal matrix composed of A,B,C,… matrices in a block diagonal manner. 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-RS (i.e., P CSI-RS,total =N TRP P CSI-RS ), across TRP and layer from Select the same L ports in (assuming dual polarization). In this case, you need to have a cardinality (payload) A 1-bit indicator is used to indicate the selected L ports for all layers, and the indicator is reported in the CSI report, for example, as a PMI component.

[0277] 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 both antenna polarizations). 1 Can be expressed as:

[0278]

[0279] 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-RS,total =N TRP P CSI-RS ), for each layer across TRP from In this case, as an example, we need to have the cardinality (payload) The selected L ports for each layer are indicated by indicators, and each indicator is reported in the CSI report, for example, as a PMI component.

[0280] In another example, L depends on the layer (index ).in this case, And therefore, in one example, it is necessary to have the base (payload) Indicators to indicate the selection for each layer ports.

[0281] 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 Can be expressed as:

[0282]

[0283] Where V is the number of layers, It is Layer W 1 , B 0,k A common set of port selection vectors for all TRPs and layers of the k-th polarization (where k=1,2) is included. In one example, B 0,k =[b 0,k ,b 1,k ,…,b L-1,k ], where, for the kth polarization, L is 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 P CSI-RS (i.e., P CSI-RS,total =N TRP P CSI-RS ), for each polarization cross TRP from In this case, as an example, we need to have the cardinality (payload) An indicator is used to indicate the selected L ports for all TRPs and layers of each polarization, and each indicator is reported in the CSI report, for example, as a PMI component.

[0285] In another example, L depends on the polarization (index k). In this case, And therefore, in one example, it is necessary to have the base (payload) The indicator indicates the selected L for each polarization k. k ports.

[0286] In one example, the component W1 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 Can be expressed as:

[0287]

[0288] 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) is included. In one example, Among them, for the k-th polarized layer L is the number of port selection vectors.

[0289] 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 ), for each layer across TRP for each polarization from In this case, as an example, we need to have the cardinality (payload) An indicator is used to indicate the selected L ports of all TRPs for each layer for each polarization, and each indicator is reported in the CSI report, for example, as a PMI component.

[0290] In another example, L depends on the polarization k and / or layer In one example, And therefore, in one example, it is necessary to have the base (payload) The indicator indicates the selected L for each polarization k. k In another example, And therefore, in one example, it is necessary to have the base (payload) Indicators to indicate the of choice In another example, And therefore, in one example, it is necessary to have the base (payload) The indicator indicates each layer for each polarization k of choice ports.

[0291] 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.

[0292] 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 determined based on UE measurement, for example), and can be configured by NW or reported by UE.

[0293] 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 both antenna polarizations). 1 Can be expressed as:

[0294]

[0295] 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 TRP = 2, for dual polarization, W 1 =diag(B 1 ,B 1 ,R 2 ,B 2 ), where diag(A,B,C,…) is a block diagonal matrix composed of A,B,C,… matrices in a block diagonal manner. 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-RS (i.e., P CSI-RS,tOtal =N TRP P CSI-RS ), the cross-polarization and layer Select the same L ports in (assuming dual polarization). In this case, you need to have a cardinality (payload) An indicator is used to indicate the selected L ports for all layers and polarization of each TRP, and each indicator is reported in the CSI report. In another example, L depends on the TRP.

[0296] The reporting of (indexes to) the port selection vectors for all TRPs can be via one joint indicator, or via multiple (separate) indicators, one for each TRP.

[0297] In one example, B i Including L i port selection vectors (the number of TRP-specific port selection vectors), that is, Among them, L i is the number of port selection vectors for TRPi. In one example, L 1 =2,L 2 =4, and so on.

[0298] In one example, L i from . For example, or

[0299] In one example, L for each TRP i from For example, And so on.

[0300] In another example, From the set of joint indicators For example, when N TRP =2,

[0301] In one example, L i Configured by NW via RRC, MAC-CE and / or DCI. In one example, L i Some of L are configured, while others are fixed or determined based on configured values. In one example, the UE determines and reports L 1 and / or L 2 , and so on.

[0302] In one example, B 1 and B 2 Including L 1 port selection vectors, and B 3 and B 4 Including L 2 port selection vectors (the number of TRP-pair-specific port selection vectors), that is, for i∈{1,2}, And for i∈{3,4}, In one example, (L 1,L 2 )=(4,2),

[0303] In one example, L 1 and L 2 from . For example, or

[0304] In one example, L i from For example,

[0305] In another example, (L 1 ,L 2 ) from the set of joint indicators For example,

[0306] In one example, L i Configured by NW via RRC, MAC-CE and / or DCI. In one example, L i One of the L is configured, while 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 .

[0307] 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 a threshold value which can be fixed, such as 2, or configured.

[0308] For example, if x is fixed at 2, we can have

[0309] When N TRP =2, for i=1,2, B i =[b i,0 ,b i,1 ,…,b i,L-1 ].

[0310] When N TRP =3 or 4, for i=1,2, For i=3,4,

[0311] In one example, (L 1 ,L 2 )=(2,4),(3,4), or another pair of values.

[0312] In one example, L 1 and L 2 from . For example, or

[0313] In one example, L i from For example,

[0314] In another example, (L 1 ,L 2 ) from the set of joint indicators For example,

[0315] In one example, L i Configured by NW via RRC, MAC-CE and / or DCI. In one example, L i One of the L is configured, while 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 .

[0316] In one example, the total number of port selection vectors for all TRPs is L sum .

[0317] 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.

[0318] In one example, L sum From the collection Select, for example,

[0319] In one example, when N TRP When ≤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 can be fixed, such as 2, or configured. In one example, (first value, second value) is configured or fixed.

[0320] In one example, L i Values ​​are layer-common and rank-common.

[0321] In one example, the L' values ​​are layer-common and rank-common.

[0322] In one example, L i Values ​​are layer-specific and rank-common.

[0323] In one example, the L' value is layer-specific and rank-common.

[0324] In one example, L i Values ​​are layer-common and rank-specific.

[0325] In one example, the L' value is layer-common and rank-specific.

[0326] In one example, L i Values ​​are layer-specific and rank-specific.

[0327] In one example, the L' value is layer-specific and rank-specific.

[0328] 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 determined based on UE measurement, for example), and can be configured by NW or reported by UE.

[0329] In one example, the component W 1 is TRP-specific, polarization-common, and layer-specific (i.e., for each TRP and each layer, a common set of CSI-RS ports is selected / reported for both antenna polarizations). 1 Can be expressed as:

[0330]

[0331] Where V is the number of layers, It is Layer W 1 , Included for layer 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-RS ), the cross-polarization Select the same L ports in (assuming dual polarization). In this case, you need to have a cardinality (payload) Indicators to indicate the Each TRPi selects L ports, and each indicator is reported in the CSI report. In another example, L depends on TRP.

[0332] In one or more examples, L and related parameters can be extended according to one or more examples described herein.

[0333] 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 Can be expressed as:

[0334]

[0335] 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 for 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 ), the cross-layer Select the same L ports in (assuming dual polarization). In this case, you need to have a cardinality (payload) The selected L ports of all layers of each TRPi for each polarization k are indicated by an indicator, and each indicator is reported in the CSI report. In another example, L depends on the TRP.

[0336] In one or more examples, L and related parameters can be extended according to one or more examples described herein.

[0337] In one example, the component W 1 is TRP-specific, polarization-specific, and layer-specific (i.e., a set of CSI-RS ports is selected / reported for each TRP, each polarization, and each layer). 1Can be expressed as:

[0338]

[0339] Where V is the number of layers, It is Layer W 1 , Included for layer 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-RS ), for TRP / polarization / layer In this case, we need to have a base number (payload) of The indicator to indicate the layer The L ports of the selected TRPi of polarization k are selected, and each indicator is reported in the CSI report. In another example, L depends on TRP, polarization and / or layer.

[0340] In one or more examples, L and related parameters can be extended according to one or more examples described herein.

[0341] In one embodiment, the component W 1 The total number of ports selected is L sum TRP-specific port selection (or TRP-specific SD-based beam selection) under the constraints of sum Under the constraint of i Includes L for TRPi i port selection vector, where L sum =∑ i L i .

[0342] 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.

[0343] In one example, L sum From the collection Select, for example,

[0344] In one example, when N TRP When ≤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 can be fixed, such as 2, or configured. In one example, (first value, second value) is configured or fixed.

[0345] In one example, the component W 1 It is TRP-specific, polarization-common and layer-common.

[0346] In one example, the component W 1 is TRP-specific, polarization-common, and layer-specific. In this case, L sum Can depend on the layer For example, In another example, L sum Fixed for all layers.

[0347] 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 (l). In another example, L sum Fixed for all polarizations.

[0348] In one example, the component W 1 It is TRP-specific, polarization-specific and layer-specific. sum Can depend on the layer and / or polarization k, for example, In another example, L sum is fixed for all layers and polarizations.

[0349] In one embodiment, the component W 1 It is the port selection common to the TRP pair (or the SD-based beam selection common to the TRP pair), that is, the same set of ports is selected for each TRP pair.

[0350] 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, W 1 Can be expressed as Among them B 12 =[b 12,0 ,…,b12,L-1 ] and B 34 =[b 34,0 ,…,b 34,L-1 ] are port selection vectors for TRP pairs (i.e., TRP 1 and 2, TRP 3 and 4), respectively. In this case, it is necessary to have a cardinality An indicator is used to indicate the selected L ports for each TRP pair, and each indicator is used for CSI reporting.

[0351] In one example, the component W 1 There are TRP pairs common, polarization common and layer specific.

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

[0353] In one example, the component W 1 There are TRP pairs that are common, polarization specific, and layer specific.

[0354] In one embodiment, the component W 1 Includes the port selection vector for a subset of TRPs.

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

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

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

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

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

[0360] 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.

[0361] In one example, the component W 1 It is TRP-specific, polarization-common and layer-common.

[0362] In one example, the component W 1 It is TRP-specific, polarization-common and layer-specific.

[0363] In one example, the component W 1 It is TRP-specific, polarization-specific and layer-common.

[0364] In one example, the component W 1 It is TRP-specific, polarization-specific and layer-specific.

[0365] 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 through α. For example, L = 2K 1 And K 1 =αP CSIRS , where α takes values ​​from {1 / 4, 1 / 2, 3 / 4, 1}.

[0366] In one embodiment, the component W f According to at least one of the following examples.

[0367] In one example, the component W f is TRP-common and layer-common, i.e., a common W is reported for all TRPs and all layers f (When the number of layers or rank > 1).

[0368] 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 is reported for all TRPs f .

[0369] In one example, the component W f is TRP-specific and layer-common, i.e., for each TRP r∈{1,…,N TRP}, reporting a common W for all layers f .

[0370] 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}, report a W f .

[0371] In one example, the component W f is common to both TRP pairs and layers, i.e., a common W is reported for each TRP pair and all layers f (When the number of layers or rank > 1).

[0372] In one example, the component W f is common to TRP pairs 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 is reported for each TRP pair f .

[0373] In one embodiment, let W f For a given rank value v, including M v Columns. v The value of can be fixed (e.g., 1 or 2), or configured via higher layer (RRC) signaling (similar to the R16 enhanced type II codebook) or reported by the UE as part of the CSI report). v The value of M and some other parameters (e.g., α, β as Rel-17 type IICB) can be jointly parameterized, and the joint parameters can be configured by NW. v The value of is based on 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.

[0374] In one example, M v The value of is common to TRP, layer, and RI. TRP , v and all values ​​of layer = 1, ..., v use the same M v value.

[0375] In one example, M v The values ​​of are TRP common, layer common, and RI specific. For each RI value v, for N TRP and all values ​​of layer = 1, ..., v use the same M in common v value.

[0376] In one example, M v The values ​​of are TRP common, layer specific, and RI common. For each layer = 1,…,v, for N TRP All values ​​of v use the same M v value.

[0377] In one example, M vThe value of is TRP-specific, layer-common, and RI-common. For each TRPr∈{1,…,N TRP}, using the same M in common for all values ​​of v and layer = 1, ..., v v value.

[0378] In one example, M v The values ​​of are TRP-common, layer-specific, and RI-specific.

[0379] In one example, M v The value of is TRP-specific, layer-specific, and RI-common.

[0380] In one example, M v The values ​​of are TRP-specific, layer-common, and RI-specific.

[0381] In one example, M v The values ​​of are TRP-specific, layer-specific, and RI-specific.

[0382] In one example, M v The value is common to TRP pairs, layers, and RIs.

[0383] In one example, M v The values ​​are TRP-common, layer-common, and RI-specific.

[0384] In one example, M v The values ​​are TRP common, layer specific, and RI common.

[0385] In one example, M v The values ​​of are TRP pairs for common, layer-specific, and RI-specific.

[0386] 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.

[0387]

[0388] Among them, f∈{0,1,…,O 3 N 3 -1}.

[0389] When N 3 While the values ​​can vary across TRPs, for the rTRP, the DFT vector It can be expressed as follows.

[0390]

[0391] Among them, f r ∈{0,1,…,O 3,r N 3,r -1}.

[0392] In one example, the oversampling factor is common to the TRPs and therefore remains the same across TRPs. For example, 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.

[0393]

[0394] In one embodiment, W f The columns of are selected from the set of port selection vectors. 3 When the values ​​are the same across TRPs, for a given N 3 Value, port selection vector v m YesN 3 Element column vector, which is in the element (m mod N P ) contains the value 1 in some places and zeros elsewhere (where the first element is element 0).

[0395] When N 3 The values ​​can vary across TRPs. For a given N 3,r Value, port selection vector YesN 3 Element column vector, whose element (m r mod N 3 ) contains the value 1 in some places and zeros elsewhere (where the first element is element 0).

[0396] In one embodiment, for W f The quantitative FD basis (or FD basis vectors) are restricted to a single window / set with a size N configured to the UE.

[0397] In one example, the FD basis (or FD basis vectors) in the window is continuous from the orthogonal DFT matrix.

[0398] In one example, the FD basis (or FD basis vectors) in the set can be continuous / non-continuous and are freely selected by the NW from an orthogonal DFT matrix.

[0399] In one embodiment, the UE is configured with an mTRP (or D-MIMO or C-JT) codebook via a higher layer parameter codebookType, for example, set to "typeII-r18-cjt" or "typeII-PortSelection-r18-cjt" based on a Rel-16 / 17 type II codebook design. For example, the mTRP codebook has a three-level structure, which can be represented as Among them, the component W 1 Used to report / indicate the SD basis matrix including the spatial domain (SD) basis vectors, component W f Used to report / indicate the frequency domain (FD) basis matrix including the FD basis vectors, and the component W 2 Used to report / indicate the coefficients corresponding to the SD and FD basis vectors.

[0400] In one embodiment, the component W 1 and W f Determined / reported in a TRP-common manner, i.e., W1 and Wf are the same for all TRPs (thus, only one W1 and one Wf are reported, regardless of N TRP For example, for the mTRP codebook The precoding matrix can be expressed as

[0401]

[0402] Among them, W 2,r is the W of the rTRP 2 Component, where r = 1, ..., N TRP .

[0403] For example, similar to the Rel-16 Type II codebook, for component W 1 ,vector By index q 1 ,q 2 ,n 1 ,n 2 Identifier, obtained from i as in 5.2.2.2.3[9] 1,1 ,i 1,2 to indicate, where the values ​​of C(x,y) are given in Table 5.2.2.2.5-4 in [9].

[0404] For example, similar to the Rel-17 Type II codebook [9], for the component W 1 , K 1 =αP CSI-RS ports based on L vectors From P CSI-RS Select from the ports, where L = K 1 / 2, which is identified by [9]

[0405] m=[m (0) …m (L-1) ]

[0406]

[0407] It is indexed by i 1,2 To indicate, where:

[0408]

[0409] For example, similar to the Rel-16 Type II codebook [9], for the component W f , vectors, f=0,1,…,M v -1, by M initial (N 3 >19) and n 3,l (l=1,…,v), where

[0410] M initial ∈{-2M v +1,-2M v +2,…,0}

[0411]

[0412] It uses the index i 1,5 (For N 3 >19) and i 1,6,l (For M v >1 and l=1,…,v), where:

[0413] i 1,5 ∈{0,1,…,2M v -1}

[0414]

[0415] For example, similar to the Rel-17 Type II codebook [9], for the component W f , M vectors, f∈{0,…,M-1} is given by n 3 To identify, where N 3 As defined in Clause 5.2.2.2.5[9], and wherein,

[0416]

[0417] Among them, the allocation index f∈{0,…,M-1} makes Increases with f. When M = 2 and N = 4, n 3 By index i 1,6 To indicate, where:

[0418] i 1,6 ∈{0,1,2}.

[0419] - If M=1, or M=2 and N=2, then i 1,6 Not reported.

[0420] - If M=2 and N=4, then assume (Offset reference) is 0, using i 1,6 Come report and The non-zero offset values ​​are mapped to i in increasing order. 1,6 , where an offset value of 1 is mapped to an index value of "0".

[0421] In one example, Among them, Q r is a co-scaling component including, for example, a common phase and a common amplitude component, and is the W of the rth TRP 2 Component, where r = 1, ..., N TRP .

[0422] In one example, for the rth TRP co-scaling component, (scalar value), where a r and θ r Select from a corresponding codebook, such as a 3-bit / 4-bit magnitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0423] oIn one example, the common amplitude (a) of each TRP r ) and common phase (θ r ) was reported.

[0424] oIn one example, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0425] In one example, for the rth TRP co-scaling component (per FD basis, i.e., a total of M v co-scaling components), Among them, diag(x 1 ,…,xA ) is included x 1 ,…,x A as an A×A diagonal matrix with diagonal entries, and a r,i and θ r,i Select from a corresponding codebook, for example, a 3-bit / 4-bit amplitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0426] oIn one example, the common amplitude ({a r,i}) and common phase ({θ r,i}) was reported.

[0427] o In one example, for M v For each i in the FD basic unit, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0428] ■ In one example, the strongest TRP is for all M v The FD basic units are identical, ie, the one strongest TRP is reported.

[0429] ■In one example, the strongest TRP can span M v The FD basic units are different, that is, M v The strongest TRP is reported.

[0430] In one example, Q r It is a logo.

[0431] · 2L×M v matrix and can be quantized via a quantization scheme (similar to the Rel-16 Type II codebook for amplitude / phase coefficients).

[0432] For rank > 1 (when v > 1),

[0433] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0434] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0435] In one example, the mTRP codebook W can be expressed as

[0436]

[0437] Among them, Q r is the co-scaling component of the rth TRP.

[0438] In one example, for the rth TRP co-scaling component, (scalar value, i.e., WB), where a r and θ r Select from a corresponding codebook, such as a 3-bit / 4-bit magnitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0439] oIn one example, the common amplitude (a) of each TRP r ) and common phase (θ r ) was reported.

[0440] oIn one example, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0441] In one example, for the rth TRP co-scaling component (per FD compression unit, i.e., N total 3 ), Among them, diag(x 1 ,…,x A ) is included x 1 ,…,x A as an A×A diagonal matrix with diagonal entries, and a r,i and θ r,i Select from a corresponding codebook, for example, a 3-bit / 4-bit amplitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0442] oIn one example, the common amplitude ({a r,i}) and common phase ({θ r,i}) was reported.

[0443] oIn one example, for N 3 For each i in the FD compression unit, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP-1 The common amplitude and common phase of the TRPs are reported.

[0444] ■ In one example, the strongest TRP is for all N 3 The FD compression units are identical, i.e., the one strongest TRP is reported.

[0445] ■ In one example, the strongest TRP can span N 3 The FD compression units are different, that is, N 3 The strongest TRP is reported.

[0446] In one example, Q r It is a logo.

[0447] In one example, W 2,r 2L×M v matrix and can be quantized via a quantization scheme similar to the Rel-16 Type II codebook for amplitude / phase coefficients.

[0448] In one example, without any additional co-scaling component, The stacked matrix is: can be considered as the component W 2 , and the stacking matrix is ​​2L sum ×M v , where, in this example, L sum =LN TRP , and can be quantized (jointly across TRPs) via a quantization scheme similar to the Rel-16 Type II codebook for amplitude / phase coefficients.

[0449] In one example, in each of the above examples, the component W 1 The L vectors of are the same for all layers l = 1, ..., v (i.e., layer common, similar to the Rel-16 type II codebook ), and the component W f M v vector is the same for all layers l=1,…,v, (i.e., layer common, f=0,1,…,M v -1).

[0450] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0451] In one example, Q r The reporting can be separate for each layer, i.e., v Q ris reported, with one Q for each layer r Be reported.

[0452] In one example, in each of the above examples, the component W 1 The L vectors of are the same for all layers l = 1, ..., v (i.e., layer common, similar to the Rel-16 type II codebook ), and the component W f M v vectors are independent for each layer l=1,…,v, (i.e., layer-specific, f=0,1,…,M v -1).

[0453] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0454] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0455] In one example, in each of the above examples, the component W 1 The L vectors of are independent for each layer l=1,…,v (i.e., layer-specific, ), and the component W f M v vector is the same for all layers l=1,…,v, (i.e., layer common, f=0,1,…,M v -1).

[0456] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0457] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0458] In one example, in each of the above examples, the component W 1 The L vectors of are independent for each layer l=1,…,v (i.e., layer-specific, ), and the component W f M vvectors are independent for each layer l=1,…,v, (i.e., layer-specific, f=0,1,…,M v -1).

[0459] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0460] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0461] In this disclosure, when a quantity is reported as TRP-specific, this means that one value of the quantity is reported for each TRP. Similarly, when a quantity is reported as TRP-common, this means that only one value of the quantity is reported, which is common to all TRPs.

[0462] In this disclosure, when a quantity is reported as layer-specific, this means that one value of the quantity is reported for each layer. Likewise, when a quantity is reported as layer-common, this means that only one value of the quantity is reported, which is common to all layers.

[0463] In one embodiment, the component W 1 is determined / reported in a TRP-specific manner, and the component W f Determined / reported in a TRP-common manner. For example, for the mTRP codebook The precoding matrix can be expressed as

[0464]

[0465] Among them, W 2,r is the W of the rTRP 2 Components, and W 1,r is the W of the rTRP 1 Component, where r = 1, ..., N TRP .

[0466] For example, for the component W 1,r , for r=1,…,N TRP , similar to the Rel-16 Type II codebook identifying the vector i=0,1,…,L-1.

[0467] In another example, for the component W 1,r , for r=1,…,N TRP, similar to the Rel-16 Type II codebook identifying the vector i=0,1,…,L r -1.

[0468] For example, for the component W 1,r , K 1 =αP CSI-RS ports based on L vectors From P CSI-RS Select from the ports, where L = K 1 / 2, which is identified similarly to the Rel-17 Type II codebook [9].

[0469] For example, for the component W 1,r , K 1,r =α r P CSI-RS ports based on L vectors From P CSI-RS Select from the following ports: r =K 1,r / 2, which is identified similarly to the Rel-17 Type II codebook [9].

[0470] For example, similar to the Rel-16 Type II codebook [9], for the component W f , vectors, f=0,1,…,M v -1, by M initial (For N 3 >19) and n 3,l (l=1,…,v), where

[0471] M initial ∈{-2M v +1,-2M v +2,…,0}

[0472]

[0473] It uses the index i 1,5 (For N 3 >19) and i 1,6,l (For M v >1 and l=1,…,v), where:

[0474] i 1,5 ∈{0,1,…,2M v -1}

[0475]

[0476] For example, similar to the Rel-17 Type II codebook [9], for the component W f , M vectors, f∈{0,…,M-1} is given by n 3 To identify, where N 3 As defined in Clause 5.2.2.2.5[9], and wherein,

[0477]

[0478] Among them, the allocation index f∈{0,…,M-1} makes Increases with f. When M = 2 and N = 4, n 3 By index i 1,6 To indicate, where:

[0479] i 1,6 ∈{0,1,2}.

[0480] - If M=1, or M=2 and N=2, then i 1,6 Not reported.

[0481] - If M=2 and N=4, then assume (Offset reference) is 0, using i 1,6 Come report and The non-zero offset values ​​are mapped to i in increasing order. 1,6 , where an offset value of 1 is mapped to an index value of "0".

[0482] In one example, Among them, Q r is a common scaling component including, for example, common phase and common amplitude components, and is the W of the rth TRP 2 Component, where r = 1, ..., N TRP .

[0483] In one example, for the rth TRP co-scaling component, (scalar value), where a r and θ r Select from a corresponding codebook, such as a 3-bit / 4-bit magnitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0484] oIn one example, the common amplitude (a) of each TRP r ) and common phase (θ r ) was reported.

[0485] oIn one example, the strongest TRP r* The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0486] In one example, for the rth TRP co-scaling component (per FD basis, i.e., M in total), Among them, diag(x 1 ,…,x A ) is included x 1 ,…,x A as an A×A diagonal matrix with diagonal entries, and a r,i and θ r,i Select from a corresponding codebook, for example, a 3-bit / 4-bit amplitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0487] oIn one example, the common amplitude ({a r,i}) and common phase ({θ r,i}) was reported.

[0488] o In one example, for M v For each i in the FD basic unit, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0489] ■ In one example, the strongest TRP is for all M v The FD basic units are identical, ie, the one strongest TRP is reported.

[0490] ■In one example, the strongest TRP can span M v The FD basic units are different, that is, M v The strongest TRP is reported.

[0491] In one example, Q r It is a logo.

[0492] In one example, W 2,r 2L×M v matrix and can be quantized via a quantization scheme (similar to the Rel-16 Type II codebook for amplitude / phase coefficients).

[0493] For rank > 1 (when v > 1),

[0494] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0495] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0496] In one example, the mTRP codebook W can be expressed as

[0497]

[0498] Among them, Q r is the co-scaling component of the rth TRP.

[0499] In one example, for the rth TRP co-scaling component, (scalar value, i.e., WB), where a r and θ r Select from a corresponding codebook, such as a 3-bit / 4-bit magnitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0500] oIn one example, the common amplitude (a) of each TRP r ) and common phase (θ r ) was reported.

[0501] oIn one example, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0502] In one example, for the rth TRP co-scaling component (per FD compression unit, i.e., N total 3 ), Among them, diag(x 1 ,…,x A ) is included x 1 ,…,x A as an A×A diagonal matrix with diagonal entries, and a r,i and θ r,i Select from a corresponding codebook, for example, a 3-bit / 4-bit amplitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0503] oIn one example, the common amplitude ({a r,i}) and common phase ({θ r,i}) was reported.

[0504] oIn one example, for N 3 For each i in the FD compression unit, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0505] ■ In one example, the strongest TRP is for all N 3 The FD compression units are identical, i.e., the one strongest TRP is reported.

[0506] ■ In one example, the strongest TRP can span N 3 The FD compression units are different, that is, N 3 The strongest TRP is reported.

[0507] In one example, Q r It is a logo.

[0508] In one example, W 2,r 2L×M v (or 2L r ×M v ) matrix and can be quantized via a quantization scheme similar to the Rel-16 Type II codebook for amplitude / phase coefficients.

[0509] In one example, without any additional co-scaling component, The stacked matrix, that is, can be considered as the component W 2 , and the stacking matrix is ​​2L sum ×M v (Wherein, for the case where the same L is used for all TRPs, L sum =LN TRP , or, where, for L r (different for each TRP), ) and can be quantized (jointly across TRPs) via a quantization scheme similar to the Rel-16 Type II codebook for amplitude / phase coefficients.

[0510] In one example, each of the above examples, for r=1, ..., N TRP , component W 1,r L (or L r) vectors are the same for all layers l = 1, ..., v (i.e., layer common, similar to the Rel-16 Type II codebook ), and the component W f M v vector is the same for all layers l=1,…,v, (i.e., layer common, f=0,1,…,M v -1).

[0511] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0512] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0513] In one example, each of the above examples, for r=1, ..., N TRP , component W 1,r L (or L r ) vectors are the same for all layers l = 1, ..., v (i.e., layer common, similar to the Rel-16 Type II codebook ), and the component W f M v The vectors are independent for each layer l=1,…,v, (i.e., layer-specific, similar to the Rel-16 Type II codebook f=0,1,…,M v -1).

[0514] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0515] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0516] In one example, each of the above examples, for r=1, ..., N TRP , component W 1,r L (or L r ) vectors for each layer l=1,…,v, are independent (i.e., layer-specific, ), and the component W fM v vectors are the same for each layer l=1,…,v, (i.e., layer common, f=0,1,…,M v -1).

[0517] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0518] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0519] In one example, each of the above examples, for r=1, ..., N TRP , component W 1,r L (or L r ) vectors for each layer l=1,…,v, are independent (i.e., layer-specific, ), and the component W f M v vectors are independent for each layer l=1,…,v, (i.e., layer-specific, f=0,1,…,M v -1).

[0520] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0521] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0522] In one embodiment, the component W 1 Determined in a TRP-common manner, and the component W f Determined in a TRP-specific manner. For example, for the mTRP codebook of the precoding matrix Can be expressed as

[0523]

[0524] Among them, W 2,r is the W of the rTRP 2 Components, and W f,r is the W of the rTRP fComponent, where r = 1, ..., N TRP .

[0525] For example, similar to the Rel-16 Type II codebook, for component W 1 ,vector By index q 1 ,q 2 ,n 1 ,n 2 Identifier, obtained from i as in 5.2.2.2.3[9] 1,1 ,i 1,2 to indicate, where the values ​​of C(x,y) are given in Table 5.2.2.2.5-4 in [9].

[0526] For example, similar to the Rel-17 Type II codebook [9], for the component W 1 , K 1 =αP CSI-RS ports based on L vectors From P CSI-RS Select from the ports, where L = K 1 / 2, which is identified by [9]

[0527] m=[m (0) …m (L-1) ]

[0528]

[0529] It is indexed by i 1,2 To indicate, where:

[0530]

[0531] For example, for the component W f,r , vectors, f=0,1,…,M v -1 for r=1,…,N TRP is identified, similar to the Rel-16 Type II codebook [9].

[0532] In another example, similar to the Rel-16 Type II codebook [9], for the component W f,r , vectors, f=0,1,…,M-1 for r=1,…,N TRP be identified.

[0533] In another example, similar to the Rel-16 Type II codebook [9], for the component W f,r , vectors, f=0,1,…,M v,r -1 for r=1,…,N TRP is identified.

[0534] For example, similar to the Rel-17 Type II codebook [9], for the component W f,r , M vectors, f∈{0,…,M-1} is identified.

[0535] For example, similar to the Rel-17 Type II codebook [9], for the component W f,r , M r vectors, f∈{0,…,M-1} is identified.

[0536] In one example, Among them, Q r is a common scaling component including, for example, common phase and common amplitude components, and is the W of the rth TRP 2 Component, where r = 1, ..., N TRP .

[0537] In one example, for the rth TRP co-scaling component, (scalar value), where a r and θ r Select from a corresponding codebook, such as a 3-bit / 4-bit magnitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0538] oIn one example, the common amplitude (a) of each TRP r ) and common phase (θ r ) was reported.

[0539] oIn one example, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0540] In one example, for the rth TRP co-scaling component (per FD basis, i.e., M in total), Among them, diag(x 1 ,…,x A ) is included x 1 ,…,x A as an A×A diagonal matrix with diagonal entries, and a r,i and θr,i Select from a corresponding codebook, for example, a 3-bit / 4-bit amplitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0541] oIn one example, the common amplitude ({a r,i}) and common phase ({θ r,i}) was reported.

[0542] o In one example, for M v For each i in the FD basic unit, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0543] ■ In one example, the strongest TRP is for all M v The FD basic units are identical, ie, the one strongest TRP is reported.

[0544] ■In one example, the strongest TRP can span M v The FD basic units are different, that is, M v The strongest TRP is reported.

[0545] In one example, Q r It is a logo.

[0546] In one example, 2L×M v matrix and can be quantized via a quantization scheme (similar to the Rel-16 Type II codebook for amplitude / phase coefficients).

[0547] For rank > 1 (when v > 1),

[0548] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0549] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0550] In one example, the mTRP codebook W can be expressed as

[0551]

[0552] Among them, Q r is the co-scaling component of the rth TRP.

[0553] In one example, for the rth TRP co-scaling component, (scalar value, i.e., WB), where a r and θ r Select from a corresponding codebook, such as a 3-bit / 4-bit magnitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0554] oIn one example, the common amplitude (a) of each TRP r ) and common phase (θ r ) was reported.

[0555] oIn one example, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0556] In one example, for the rth TRP co-scaling component (per FD compression unit, i.e., N total 3 ), Among them, diag(x 1 ,…,x A ) is included x 1 ,…,x A as an A×A diagonal matrix with diagonal entries, and a r,i and θ r,i Select from a corresponding codebook, for example, a 3-bit / 4-bit amplitude and phase codebook similar to the codebook used for coefficients in the Rel-16 Type II codebook.

[0557] oIn one example, the common amplitude ({a r,i}) and common phase ({θ r,i}) was reported.

[0558] oIn one example, for N 3 For each i in the FD compression unit, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0559] ■ In one example, the strongest TRP is for all N3 The FD compression units are identical, i.e., the one strongest TRP is reported.

[0560] ■ In one example, the strongest TRP can span N 3 The FD compression units are different, that is, N 3 The strongest TRP is reported.

[0561] In one example, Q r It is a logo.

[0562] In one example, W 2,r 2L×M v matrix and can be quantized via a quantization scheme similar to the Rel-16 Type II codebook for amplitude / phase coefficients.

[0563] In one example, without any additional co-scaling component, The stacked matrix, that is, can be considered as the component W 2 , and the stacking matrix is ​​2L sum ×M v , where, in this example, L sum =LN TRP , and can be quantized (jointly across TRPs) via a quantization scheme similar to the Rel-16 Type II codebook for amplitude / phase coefficients.

[0564] In one example, each of the above examples, for r=1, ..., N TRP , component W 1 The L vectors of are the same for all layers l = 1, ..., v (i.e., layer common, similar to the Rel-16 type II codebook ), and the component W f,r M v (or M v,r , or M) vectors are the same for all layers l=1,…,v, (i.e., layer common, f=0,1,…,M v -1).

[0565] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0566] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, one for each layer.

[0567] In one example, each of the above examples, for r=1, ..., N TRP , component W 1 The L vectors of are the same for all layers l = 1, ..., v (i.e., layer common, similar to the Rel-16 type II codebook ), and the component W f,r M v (or M v,r , or M) vectors are independent for each layer l=1,…,v, (i.e., layer-specific, similar to the Rel-16 Type II codebook f=0,1,…,M v -1).

[0568] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0569] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0570] In one example, each of the above examples, for r=1, ..., N TRP , component W 1 The L vectors of are independent for each layer l=1,…,v (i.e., layer-specific, ), and the component W f,r M v (or M v,r , or M) vectors are the same for all layers l=1,…,v, (i.e., layer common, f=0,1,…,M v -1).

[0571] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0572] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0573] In one example, each of the above examples, for r=1, ..., N TRP , component W 1The L vectors of are independent for each layer l=1,…,v (i.e., layer-specific, ), and the component W f,r M v (or M v,r , or M) vectors are independent for each layer l=1,…,v, (i.e., layer-specific, f=0,1,…,M v -1).

[0574] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0575] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0576] In one embodiment, the component W 1 and W f Determined in a TRP-common manner. For example, the mTRP codebook for the precoding matrix Can be expressed as

[0577]

[0578] Among them, W 1,r is the W of the rTRP 1 Weight, W 2,r is the W of the rTRP 2 Quantity, and W f,r is the W of the rTRP f Component, where r = 1, ..., N TRP .

[0579] For example, for the component W 1,r , similar to the Rel-16 Type II code to identify vectors i=0,1,…,L-1,for r=1,…,N TRP .

[0580] In another example, for the component W 1,r , for r=1,…,N TRP , similar to the Rel-16 Type II codebook identifying the vector i=0,1,…,L r -1.

[0581] For example, for the component W 1,r , K 1=αP CSI-RS ports based on L vectors From P CSI-RS Select from the ports, where L = K 1 / 2, which is similar to the Rel-17 type II codebook [9] is identified.

[0582] For example, for the component W 1,r , K 1,r =α r P CSI-RS ports based on L vectors From P CSI-RS Select from the following ports: r =K 1,r / 2, which is identified similarly to the Rel-17 Type II codebook [9].

[0583] For example, for the component W f,r , for r=1,…,N TRP , Vector f=0,1,…,M v -1 is identified similarly to the Rel-16 Type II codebook [9].

[0584] In another example, for the component W f,r , for r=1,…,N TRP , Vector f = 0, 1, ..., M-1 is identified similarly to the Rel-16 type II codebook [9].

[0585] In another example, for the component W f,r , for r=1,…,N TRP , Vector f=0,1,…,M v,r -1 is identified similarly to the Rel-16 Type II codebook [9].

[0586] For example, for the component W f,r , M vectors f∈{0,…,M-1} is identified similarly to the Rel-17 type II codebook [9].

[0587] For example, for the component W f,r , M r Vector f∈{0,…,M r -1} is identified similarly to the Rel-17 Type II codebook [9].

[0588] In one example, Among them, Q r is a common scaling component including, for example, common phase and common amplitude components, and is the W of the rth TRP 2 Component, where r = 1, ..., N TRP .

[0589] In one example, for the rth TRP co-scaling component, (scalar value), where a r and θ r Select from a corresponding codebook, such as a 3-bit / 4-bit magnitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0590] oIn one example, the common amplitude (a) of each TRP r ) and common phase (θ r ) was reported.

[0591] oIn one example, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0592] In one example, for the rth TRP co-scaling component (per FD basis, i.e., M in total), Among them, diag(x 1 ,…,x A ) is included x 1 ,…,x A as an A×A diagonal matrix with diagonal entries, and a r,i and θ r,i Select from a corresponding codebook, for example, a 3-bit / 4-bit amplitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0593] oIn one example, the common amplitude ({a r,i}) and common phase ({θ r,i}) was reported.

[0594] o In one example, for M v For each i in the FD basic unit, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP-1 The common amplitude and common phase of the TRPs are reported.

[0595] ■ In one example, the strongest TRP is for all M v The FD basic units are identical, ie, the one strongest TRP is reported.

[0596] ■In one example, the strongest TRP can span M v The FD basic units are different, that is, M v The strongest TRP is reported.

[0597] In one example, Q r It is a logo.

[0598] In one example, 2L×M v matrix and can be quantized via a quantization scheme (similar to the Rel-16 Type II codebook for amplitude / phase coefficients).

[0599] For rank > 1 (when v > 1),

[0600] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0601] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0602] In one example, the mTRP codebook W can be expressed as

[0603]

[0604] Among them, Q r is the co-scaling component of the rth TRP.

[0605] In one example, for the rth TRP co-scaling component, (scalar value, i.e., WB), where a r and θ r Select from a corresponding codebook, such as a 3-bit / 4-bit magnitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0606] oIn one example, the common amplitude (a) of each TRP r ) and common phase (θ r ) was reported.

[0607] oIn one example, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0608] In one example, for the rth TRP co-scaling component (per FD compression unit, i.e., N total 3 ), Among them, diag(x 1 ,…,x A ) is included x 1 ,…,x A as an A×A diagonal matrix with diagonal entries, and a r,i and θ r,i Select from a corresponding codebook, for example, a 3-bit / 4-bit amplitude and phase codebook similar to the codebook for coefficients in the Rel-16 Type II codebook.

[0609] oIn one example, the common amplitude ({a r,o}) and common phase ({θ r,i}) was reported.

[0610] oIn one example, for N 3 For each i in the FD compression unit, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0611] ■ In one example, the strongest TRP is for all N 3 The FD compression units are identical, i.e., the one strongest TRP is reported.

[0612] ■ In one example, the strongest TRP can span N 3 The FD compression units are different, that is, N 3 The strongest TRP is reported.

[0613] In one example, Q r It is a logo.

[0614] In one example, W 2,r 2L×M v matrix and can be quantized via a quantization scheme similar to the Rel-16 Type II codebook for amplitude / phase coefficients.

[0615] In one example, without any additional co-scaling component, The stacked matrix, that is, can be considered as the component W 2 , and the stacking matrix is ​​2L sum ×M v (Wherein, for the case where the same L is used for all TRPs, L sum =LN TRP , or, where, for L r (different for each TRP), ) and can be quantized (jointly across TRPs) via a quantization scheme similar to the Rel-16 Type II codebook for amplitude / phase coefficients.

[0616] In one example, each of the above examples, for r=1, ..., N TRP , component W 1,r L (or L r ) vectors are the same for all layers l = 1, ..., v (i.e., layer common, similar to the Rel-16 Type II codebook ), and for r=1,…,N TRP , component W f,r M v (or M v,r , or M) vectors are the same for all layers l=1,…,v, (i.e., layer common, f=0,1,…,M v -1).

[0617] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0618] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0619] In one example, each of the above examples, for r=1, ..., N TRP , component W 1,r L (or L r ) vectors are the same for all layers l = 1, ..., v (i.e., layer common, similar to the Rel-16 Type II codebook ), and for r=1,…,N TRP , component W f,r M v (or M v,r, or M) vectors are independent for each layer l=1,…,v, (i.e., layer-specific, similar to the Rel-16 Type II codebook f=0,1,…,M v -1).

[0620] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0621] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0622] In one example, each of the above examples, for r=1, ..., N TRP , component W 1,r L (or L r ) vectors for each layer l=1,…,v, are independent (i.e., layer-specific, ), and for r=1,…,N TRP , component W f,r M v (or M v,r , or M) vectors are the same for all layers l=1,…,v, (i.e., layer common, f=0,1,…,M v -1).

[0623] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0624] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0625] In one example, each of the above examples, for r=1, ..., N TRP , component W 1,r L (or L r ) vectors for each layer l=1,…,v, are independent (i.e., layer-specific, ), and for r=1,…,N TRP , component W f,r M v (or M v,r, or M) vectors are independent for each layer l=1,…,v, (i.e., layer-specific, f=0,1,…,M v -1).

[0626] In one example, Q r Reports can be common to all layers, i.e., a Q r is reported, which is common to all layers.

[0627] In one example, Q r The reporting can be separate for each layer, i.e., v Q r is reported, with one Q for each layer r Be reported.

[0628] In one embodiment, the co-scaled component Q can be reported according to at least one of the following examples: r , for r=1,…,N TRP , which includes common-amplitude and common-phase components.

[0629] In one example, both the common amplitude component and the common phase component are reported in a wideband (WB) manner. For example, Among them, a r and θ r is the amplitude and phase value of TRP r,

[0630] oIn one example, the common amplitude (a) of each TRP r ) and common phase (θ r ) was reported.

[0631] oIn one example, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0632] In one example, the common amplitude component is reported in WB mode, and the common phase component is reported per SB, per FD unit (a total of N 3 FD units) or per FD basis vector (a total of M FD basis vectors). In one example, Q r =a r P r , where P r is the diagonal matrix of the phase components.

[0633] o In one example, for the case of per-FD basis vector reporting of the phase component, P r Yes An M×M diagonal matrix.

[0634] o In one example, for the case of per-FD unit reporting of the phase component, P r Yes N 3 ×N 3 Diagonal matrix.

[0635] o In one example, for the case of per SB reporting of the phase component, P r is R repetitions of each R diagonal term Value N 3 ×N 3 Diagonal matrix. For example, R = 2 and N 3 =20,

[0636] oIn one example, the common amplitude (a) of each TRP r ) and common phase ({θ r,i}) was reported.

[0637] oIn one example, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0638] In one example, the common amplitude component is reported in WB mode, and the common phase component is reported per SB, per FD unit (a total of N 3 FD units) or per FD basis vector (a total of M FD basis vectors). In one example, Among them, A r is the diagonal matrix of the phase components.

[0639] o In one example, for the case of per-FD basis vector reporting of the magnitude component, A r is including a r,1 ,…,a r,M An M×M diagonal matrix.

[0640] o In one example, for the case where the magnitude component is reported per FD unit, A r Yes N 3 ×N 3 Diagonal matrix.

[0641] o In one example, for the case of per SB reporting of the phase component, A r is R repetitions of each R diagonal term r,i Value N3 ×N 3 Diagonal matrix. For example, R = 2 and N 3 =20, A r =diag(a r,1 ,a r,1 ,a r,2 ,a r,2 ,…,a r,10 ,a r,10 ).

[0642] o In one example, for each FD unit report (N 3 ) or per SB report or per FD basis vector report (M) for each i in the considered cell, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0643] ■ In one example, the strongest TRP is the same for all cells (N for the case of FD compression cells). 3 , for each SB report Or M) for the case of FD basis vector reporting, i.e., one strongest TRP is reported.

[0644] ■ In one example, the strongest TRP can be different across all cells (N for the case of FD compression cells). 3 , for each SB report Or M for the case of FD basis vector reporting, that is, N 3 , Or the M strongest TRPs are reported.

[0645] In one example, both the common amplitude component and the common phase component are per SB, per FD unit (a total of N 3 FD units) or per FD basis vector (a total of M FD basis vectors). In one example, Q r =A r P r , where A r ,P r is a diagonal matrix of amplitude / phase components.

[0646] o In one example, for the case of per-FD basis vector reporting of the magnitude / phase components, A r and P r are respectively including a r,1 ,…,a r,M and An M×M diagonal matrix.

[0647] o In one example, for the case of per-FD basis vector reporting of the magnitude / phase components, A r and P r They include and N 3 ×N 3 Diagonal matrix.

[0648] o In one example, for the case of per-SB reporting of the magnitude / phase component, A r and P r For each R diagonal term, there are R repeated a r,i Value and N 3 ×N 3 Diagonal matrix. For example, R = 2 and N 3 =20, A r =diag(a r,1 ,a r,1 ,a r,2 ,a r,2 ,…,a r,10 ,a r,10 )and

[0649] o In one example, for each FD unit report (N 3 ) or per SB report or per FD basis vector report (M) for each i in the considered cell, the strongest TRP r * The common amplitude and common phase is fixed (e.g., 1) and is therefore not reported, and the remaining N TRP -1 The common amplitude and common phase of the TRPs are reported.

[0650] ■ In one example, the strongest TRP is the same for all cells (N for the case of FD compression cells). 3 , for each SB report Or M) for the case of FD basis vector reporting, i.e., one strongest TRP is reported.

[0651] ■ In one example, the strongest TRP can be different across all cells (N for the case of FD compression cells). 3 , for each SB report Or M for the case of FD basis vector reporting, that is, N 3 , Or the M strongest TRPs are reported.

[0652] 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, p (2) is the (differential) coefficient amplitude value. In [9], for each layer l=1,…,v, there are two reference amplitude values Among them, a reference value corresponding to SCI is set to 1 (and therefore not reported, i.e., and ), and another reference value corresponding to another polarization of the coefficient of the SCI is selected from the 4-bit amplitude codebook of Table 5.2.2.2.5-2 in [9] and reported (i.e., indicator is reported). For p (2) , please refer to [9] for details.

[0653] In the mTRP codebook disclosed in the present invention, for N TRP ≥2, the number of reference amplitude values ​​(about p (1) ) can be based on at least one of the following examples. is used for TRP r∈{1,…,N TRP} and two reference amplitude values ​​of layer l=1,…,v. N≤N TRP can be configured via RRC, MAC-CE or DCI, or can be determined and reported by the UE, or can be determined implicitly, where N is N TRP The number of (selected) cooperating TRPs among the TRPs.

[0654] In one embodiment, for r=1, ..., N TRP , the total scaling component Q r The common amplitude component in is the same as the reference coefficient component Independent portions.

[0655] In one embodiment, for r=1, ..., N TRP , the total scaling component Q r does not include the common amplitude component, but only includes the common phase component (i.e., Q r =P r ). In one example, regarding The reference coefficient component (an extension of) can be utilized to act as a common amplitude component, ie, the common amplitude value is absorbed in the reference coefficient component.

[0656] In one embodiment, there is no co-scaling component Qr In one example, regarding The reference coefficient component (extension of) can be utilized to act as the common amplitude component, and W 2 The phase component in can be utilized to act as a common-phase component.

[0657] In an example, one of the above examples / embodiments is configurable based on RRC, such as CSI-reportConfig or MAC-CE or DCI.

[0658] In one example, for each of the above examples / embodiments, a r,i and Select from the corresponding codebook.

[0659] In one example, the codebook is fixed, for example, an x-bit amplitude codebook and a y-bit phase codebook, where x=3, y=3.

[0660] In one example, one codebook is configured via RRC, MAC-CE or DCI and the other codebook is fixed. For example, an x-bit amplitude codebook is fixed and a y-bit phase codebook is configured, where x=3, y={3, 4}.

[0661] In one example, both codebooks are configured via RRC, MAC-CE or DCI, for example, an x-bit amplitude codebook and a y-bit phase codebook are configured, where x={3, 4}, y={3, 4}.

[0662] Any of the above-described examples in the present embodiment can be applied to other embodiments.

[0663] In one embodiment, the value of the common amplitude can be 0, where the value 0 indicates that the corresponding TRP is not selected (or not included) for CSI reporting. In one example, when the UE reports multiple common amplitude values ​​for each TRP, all common amplitude values ​​are 0, or all values ​​are non-zero (or>0).

[0664] When the CSI reporting is via two-part UCI including UCI part 1 and UCI part 2, then UCI part 1 may include a UCI parameter or indicator indicating information about whether the common amplitude is 0 or >0 for different TRPs.

[0665] In one example, N TRP A bit map of bits is used to indicate information. For example, when the bit value is "1", the corresponding TRP has a common amplitude > 0, and when the bit value is "0", the corresponding TRP has a common amplitude = 0. Alternatively, when the bit value is "0", the corresponding TRP has a common amplitude > 0, and when the bit value is "1", the corresponding TRP has a common amplitude = 0.

[0666] In one example, A bit indicator is used to indicate the number of TRPs with a common amplitude > 0. In this case, the index of the TRPs with a common amplitude > 0 can be indicated via UCI part 2 (a separate indicator or via an existing indicator, such as a bitmap indicator).

[0667] In one embodiment, the co-scaled components can be determined / reported using a linear combination compression technique such as Rel-15 / 16 / 17 type-IICSI codebook. For example, the matrix including the co-amplitude / co-phase across TRPs can be represented as S=S 1 S 2 or Among them, S 1 Yes, including N TRP The basis matrix of the SD beam vector in the dimensional space, S f Yes, including N 3 The basis matrix of the FD beam vector in the dimensional or M-dimensional space, and S 2 is a coefficient matrix including coefficients corresponding to SD / FD beam pairs.

[0668] In one embodiment, the UE is configured with an mTRP (or D-MIMO or C-JT) codebook via a higher layer parameter codebookType set, for example, to "typeII-r18-cjt" or "typeII-PortSelection-r18-cjt", where the codebook is one of the following:

[0669] Mode 1: SD / FD basis selection per TRP / TRP group. Example formula (N TRP = number of TRPs or TRP groups):

[0670]

[0671] Mode 2: SD-based selection and union (across N TRP TRP)FD basis selection. Example formula (N TRP = number of TRPs or TRP groups):

[0672] or

[0673] In one example, Mode 1 is a codebook described in one or more embodiments described herein and Mode 2 is a codebook described in one or more embodiments described herein.

[0674] In one example, the two modes can share the same detailed design, such as parameter combination, basis selection, TRP (group) selection, reference amplitude, A quantitative plan.

[0675] In one example, the parameter combination can be a parameter tuple for a conventional type IICJT codebook, such as L, p v ,β, or a parameter tuple for port selection type IICJT codebook, such as,M,α,β.

[0676] • In one example, the basis selection scheme can be the SD basis selection and / or the FD basis selection scheme described herein.

[0677] 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 a phase and an amplitude and they are selected into a corresponding codebook, and a codebook subset restriction.

[0678] In one embodiment, the UE reports the UE capabilities regarding possible mode operation among two modes.

[0679] In one example, the UE reports only Mode 1 as the UE capability. If the NW receives this UE capability, the NW can configure only Mode 1 to the UE.

[0680] In one example, the UE reports only Mode 2 as the UE capability. If the NW receives this UE capability, the NW can configure only Mode 2 to the UE.

[0681] In one example, the UE reports Mode 1 and Mode 2 as UE capabilities. If the NW receives the UE capabilities, the NW can configure Mode 1 or Mode 2 to the UE.

[0682] In one embodiment, both modes support the same set of rank candidates Right now, Any rank in can be configured for mode 1 or mode 2.

[0683] In one example,

[0684] In one example,

[0685] In another example,

[0686] In one embodiment, each mode i supports a different set of rank candidates

[0687] In one example, low rank (e.g., ) can be configured for mode 1, and high rank (e.g., ) can be configured for mode 2.

[0688] In one example, low rank (e.g., ) for mode 2, and high rank (e.g., ) for mode 1.

[0689] In one example, low rank (e.g., ) for mode 1, and any rank (e.g., For mode 2.

[0690] In one example, low rank (e.g., ) for mode 2, and any rank (e.g., ) is used for mode 2.

[0691] In one embodiment, there are common codebook parameters for Mode 1 and Mode 2, as well as mode specific codebook parameters.

[0692] In one example, L (or L sum or L r ) value is a common parameter for both Mode 1 and Mode 2, i.e., the same value can be configured for both Mode 1 and Mode 2.

[0693] In one example, L (or L sum or L r ) values ​​are mode-specific parameters, i.e., independent L values ​​can be configured for each mode.

[0694] In one example, M v (or or M v,r ) value is a common parameter for both Mode 1 and Mode 2, i.e., it is possible to configure M for both Mode 1 and Mode 2. v (or or M v,r )

[0695] In one example, M v (or M v,sum or M v,r ) values ​​are mode-specific parameters, i.e., independent M can be configured for each mode. v (or M v,sum or M v,r ) values.

[0696] In one embodiment, one of the two modes is signaled to the UE according to at least one of the following examples:

[0697] In one example, a new RRC parameter is introduced to select / indicate one of mode 1 and mode 2, for example, using a higher layer parameter codebookMode, where codebookMode is set to Mode1 when mode 1 is configured, and codebookMode is set to Mode2 when mode 2 is configured.

[0698] An example could be as follows:

[0699]

[0700]

[0701]

[0702]

[0703] In one example, an extension of an existing parameter is used to select / indicate one of mode 1 and mode 2, for example, the higher layer parameter codebookType is set to typeII-r18-cjt-mode1, typeII-r18-cjt-mode2, typeII-PortSelection-r18-cjt-mode1, or typeII-PortSelection-r18-cjt-mode2.

[0704] An example could be as follows:

[0705]

[0706]

[0707]

[0708] In one example, the UE is indicated / configured with Mode 1 or Mode 2 via MAC-CE or DCI.

[0709] In another example, the UE determines one of the two patterns and reports it as part of the CSI report (eg, via UCI part 1 of a two-part UCI).

[0710] In one example, the FD basis (or FD basis vectors) in the set can be continuous / non-continuous and are freely selected by the NW from an orthogonal DFT matrix.

[0711] In this disclosure, the term "polarization" is used to indicate a CSI-RS antenna port group. For example, a first polarization can correspond to a CSI-RS antenna port And the second polarization can correspond to the CSI-RS antenna port

[0712] The coefficient matrix W across all TRPs 2 Can be based on per TRPW 2.r The matrix is ​​determined, where r = 1, ..., N TRP .For example,

[0713] When W f is common to all TRPs (for a W common to all TRPs f ), then is the coefficient matrix across all TRPs.

[0714] When W f is TRP specific (for each TRP r there is a W f,r ), then is the coefficient matrix across all TRPs.

[0715] 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).

[0716] The payload of the SCI can be based on one of the following examples.

[0717] In one example, the payload is bits.

[0718] o In one example, X=2L (eg, when L SD basis vectors are united across TRPs).

[0719] oIn 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).

[0720] o 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).

[0721] o In one example, X = 2LM or 2LM v (For example, when L SD basis vectors and FD basis vectors are united across TRP).

[0722] oIn 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).

[0723] oIn one example,

[0724] oIn one example,

[0725] oIn one example,

[0726] o 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).

[0727] o In one example, X = β2LM or β2LM v (For example, when L SD basis vectors and FD basis vectors are united across TRP).

[0728] oIn 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).

[0729] oIn one example,

[0730] oIn one example,

[0731] oIn one example,

[0732] o 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).

[0733] In one example, the payload is bits, of which bits are used to indicate the index of the strongest coefficient, and bits are used to indicate the index of the TRP to which the strongest coefficient belongs (eg, the strongest TRP).

[0734] o In one example, X=2L and Y=N TRP .

[0735] o In one example, X = 2L r and Y = NTRP .

[0736] o In one example, X=2LM and Y=N TRP .

[0737] o In one example, X = 2L r M r and Y = N TRP .

[0738] o In one example, X = β2LM and Y = N TRP .

[0739] o In one example, X = β2L r M r and Y = N TRP .

[0740] Here, 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.

[0741] In one example, the strongest TRP described in all embodiments / examples of the present disclosure can be obtained by the reference TRP or (from a total of N TRP In one example, the reference TRP can be replaced by a TRP selected from among multiple TRPs. In one example, the reference TRP can be configured via RRC, MAC-CE, or DCI. In one example, the reference TRP can be fixed or determined in a predefined rule. In one example, the reference TRP can be determined by the UE and reported as part of the CSI.

[0742] 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).

[0743] In one example, there are two separate indicators (x, y), where the SCI corresponds to x and the strongest TRP indicator corresponds to y.

[0744] In one example, the payload of indicator y is bits.

[0745] In one example, the payload of indicator y is bits.

[0746] In one example, X=2L.

[0747] In one example, X = 2L r .

[0748] • In one example, X=2LM.

[0749] In one example, X = 2L r M r .

[0750] In one example, X = β2LM.

[0751] In one example, X = β2L r M r .

[0752] In the Rel-16 / 17 Type II codebook, 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 [9], for each layer l=1,…,v, there are two reference amplitude values Among them, a reference value corresponding to SCI is set to 1 (and therefore not reported, i.e., and ), and another reference value corresponding to another polarization of the coefficient of the SCI is selected from the 4-bit amplitude codebook of Table 5.2.2.2.5-2 in [9] and reported (i.e., indicator is reported). For p (2) , please refer to [9] for details.

[0753] In the mTRP codebook disclosed in the present invention, for N TRP ≥2, the number of reference amplitude values ​​(about p (1) ) can be based on at least one of the following examples. is used for TRP r∈{1,…,N TRP} and two reference amplitude values ​​for layer l=1,…,v.

[0754] In one example, for each layer l (layer specific), the number of reference amplitude values ​​(N ref ) is fixed regardless of N TRP For example, N ref = 2. Therefore, there are 2v reference amplitude values ​​for v layers in total.

[0755] In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, the polarization of the SCI for all TRPs A reference value corresponding to SCI is set to 1, i.e., for all r values, and for all other polarizations of TRP (x≠x* ) is selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4N per layer TRP bits.

[0756] In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, the polarization of the SCI for the strongest TRP A reference value corresponding to SCI is set to 1, i.e., for the r associated with the strongest TRP * value, and for the other polarizations with the strongest TRP (x≠x * ) is selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits per layer.

[0757] In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, the polarization of the SCI for the strongest TRP A reference value corresponding to SCI is set to 1, i.e., for the r associated with the strongest TRP * value, and for other reference values ​​of the remaining coefficients not associated with the polarization of the SCI of the strongest TRP (i.e. ) are selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits per layer.

[0758] In one example, for each layer l, for the polarization of SCI for all TRPs, one reference value corresponding to the 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., W for the other polarization of SCI) 2 Another reference value corresponding to the second SCI is selected from the x-bit amplitude codebook (e.g., x=4) and reported. This reference value is used for the other polarizations of the SCI of all TRPs.

[0759] In one example, the number of reference amplitude values ​​(N ref ) is fixed regardless of N TRP For example, N ref =2, and the total number of reference amplitude values ​​of v layers is 2 (common to the layers).

[0760] In one example, for all layers, the polarization of the SCI for all TRPs A reference value corresponding to SCI is set to 1, i.e., for all r values, 1, and for all other polarizations of TRP (x≠x * ) is selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4N for all layers TRP Bit.

[0761] In one example, similar to the Rel-16 / 17 Type II codebook, for all layers l, the polarization of the SCI for the strongest TRP A reference value corresponding to SCI is set to 1, i.e., for the r associated with the strongest TRP * value, and for the other polarizations with the strongest TRP (x≠x * ) is selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits for all layers.

[0762] In one example, similar to the Rel-16 / 17 Type II codebook, for all layers l, the polarization of the SCI for the strongest TRP A reference value corresponding to SCI is set to 1, i.e., for the r associated with the strongest TRP * value, and other reference values ​​of the remaining coefficients not associated with the polarization of the SCI of the strongest TRP (i.e., ) is selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 4 bits for all layers.

[0763] In one example, for all layers, for one polarization of SCI for all TRPs, one reference value corresponding to the 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 the W across all TRPs. 2 The position (or index) of the strongest coefficient (i.e., the W of the other polarizations of SCI 2 The other reference value corresponding to the second SCI is selected from the x-bit amplitude codebook (e.g., x=4) and reported. This reference value is used for the other polarizations of the SCI of all TRPs.

[0764] In one example, for each layer l (layer specific), the number of reference amplitude values ​​(N ref ) is fixed regardless of N TRP For example, N ref = 3. Therefore, there are 3v reference amplitude values ​​for v layers in total.

[0765] In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, the polarization of the SCI for the strongest TRP A reference value corresponding to SCI is set to 1, i.e., for the r associated with the strongest TRP * value, and for the other polarizations with the strongest TRP (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 are selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 8 bits per layer.

[0766] In one example, the number of reference amplitude values ​​(N ref ) is fixed regardless of N TRr For example, N ref =3, and the total number of reference amplitude values ​​for v layers is 3 (common to the layers).

[0767] In one example, similar to the Rel-16 / 17 Type II codebook, for all layers, the polarization of the SCI for the strongest TRP A reference value corresponding to SCI is set to 1, i.e., for the r associated with the strongest TRP * value, and for the other polarizations with the strongest TRP (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 are selected from a 4-bit amplitude codebook and reported. Therefore, the total payload is 8 bits for all layers.

[0768] In one example, for each layer l (layer specific), the number of reference amplitude values ​​(N ref ) is fixed regardless of N TRP For example, N ref = 4. Therefore, there are 4 reference amplitude values ​​for v layers in total.

[0769] In one example, similar to the Rel-16 / 17 Type II codebook, for each layer l, the polarization of the SCI for the strongest TRP A reference value corresponding to SCI is set to 1, i.e., for the r associated with the strongest TRP * value, and for the other polarizations with the strongest TRP (x≠x *) is selected from a 4-bit amplitude codebook and reported, and 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 polarization of SCI is selected from a 4-bit amplitude codebook and reported. Thus, the total payload is 12 bits per layer.

[0770] In one example, the reference amplitude value (N ref ) is fixed regardless of N TRP For example, N ref =4, and the total number of reference amplitude values ​​for v layers is 4 (common to the layers).

[0771] In one example, similar to the Rel-16 / 17 Type II codebook, for all layers, the polarization of the SCI for the strongest TRP A reference value corresponding to SCI is set to 1, i.e., for the r associated with the strongest TRP * value, and for the other polarizations with the strongest TRP (x≠x * ) is selected from a 4-bit amplitude codebook and reported, and 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 polarization of SCI is selected from a 4-bit amplitude codebook and reported. Thus, the total payload is 12 bits for all layers.

[0772] In one example, for each of the above examples, an equal bit codebook (eg, 4 bits) can be used for the reference amplitude value.

[0773] In another example, for each of the above examples, a unequal bit codebook (eg, 4 bits) can be used for the reference amplitude value.

[0774] • 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 unequal bits can be signaled by the NW via RRC, MAC-CE or DCI.

[0775] In one example, for each layer l (layer specific), the number N of reference amplitude values ref It is 2N TRP .

[0776] 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 another reference value is used for the other polarization of the TRP associated with the SCI, selected from an x-bit amplitude codebook (e.g., x=4), and reported. The remaining 2N TRP - Each of the two reference values ​​is for the other (N) not associated with SCI TRP -1) TRPs for each polarization. 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.

[0777] In one example, for the polarization of the SCI for the TRP associated with the SCI, a 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., in the W for the other polarizations used for SCI) 2 Another reference value corresponding to the second SCI is selected from the 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 remaining reference values ​​are divided into two groups, where group 1 is used for (N TRP -1) TRPs for each of the SCIs, and Group 2 for the (N) not associated with the SCI TRP -1) TRPs. For the reference values ​​in group 1, each reference value is from y 1 For the reference values ​​in group 2, each reference value is selected from y 2 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 for the TRP associated with the SCI. 1 ,y 2 Can be the same value, fixed or configured by NW.

[0778] In one example, for all layers (common to all layers), the number of reference amplitude values ​​N ref It is 2N TRPThe above examples can be examples for all layers.

[0779] In one example, for each layer l (layer specific), the number N of reference amplitude values ref is 2+(N TRP -1).

[0780] In one example, for a polarization of the SCI of a TRP associated with the SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported), and another reference value is selected from an x-bit amplitude codebook (e.g., x=4) for another polarization of the SCI of the TRP associated with the SCI, and reported. TRP -1 reference value each for other (N) not associated with SCI TRP -1) 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.

[0781] In one example, for all layers (common to all layers), the number of reference amplitude values ​​N ref is 2+(N TRp -1). The above example can be an example for all layers.

[0782] In one example, for each layer l (layer specific), the number N of reference amplitude values ref YesN TRp .

[0783] In one example, for both polarizations of the TRP associated with SCI, one reference value corresponding to the SCI is set to 1 (and therefore not reported), and the remaining N TRP -1 reference value each for N not associated with SCI TRP -Two polarizations for each of the 1 TRPs, selected from an x-bit amplitude codebook (e.g., x=4), and reported. The remaining N TRP -1 reference value each for other (N) not associated with SCI TRP -1) 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.

[0784] In one example, for all layers (common to all layers), the number of reference amplitude values ​​N ref YesN TRP The above examples can be examples for all layers.

[0785] In one example, for each layer l (layer specific), the number N of reference amplitude values ref YesN TRP Specific.

[0786] In one example, for N TRP ≤b,N ref =a, and for N TRP > b, N ref =c, for example, a=2, b=3, c=4.

[0787] In one example, for all layers (common to all layers), the number of reference amplitude values ​​N ref YesN TRP The above examples can be examples for all layers.

[0788] In one example, for each layer l (layer specific), the number N of reference amplitude values ref Configured by NW.

[0789] In one example, N ref ={2,2N TRP} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value is configured, the reference amplitude value can be based on one of the above examples.

[0790] In one example, N ref ={2,2+N TRP -1} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once one value is configured, the reference amplitude value can be according to one of the above examples.

[0791] In one example, N ref ={2,N TRP} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value is configured, the reference amplitude value can be based on one of the above examples.

[0792] In one example, N ref ={2,N TRP ,2N TRP} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value is configured, the reference amplitude value can be based on one of the above examples.

[0793] In one example, N ref ={2,2+N TRP -1,2N TRP} and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value is configured, the reference amplitude value can be based on one of the above examples.

[0794] In one example, {2,3,4,N TRP ,2N TRP ,2+N TRP Any subset of N ref A set of values, and one of the values ​​is configured via DCI, MAC-CE or RRC parameters. Once a value is configured, the reference amplitude value can be based on one of the above examples.

[0795] In one example, for all layers (common to all layers), the number of reference amplitude values ​​N ref Configured by NW. The above examples can be examples for all layers.

[0796] In one example, for each layer l (layer specific), the number N of reference amplitude values ref Determined and reported by the UE.

[0797] In one example, N ref ={2,2N TRP} and one of the values ​​is determined and reported. Once a value is determined, the reference amplitude value can be based on one of the examples above.

[0798] In one example, N ref ={2,2+N TRP -1} and one of the values ​​is determined and reported. Once a value is determined, the reference amplitude value can be based on one of the examples above.

[0799] In one example, N ref ={2,N TRP} and one of the values ​​is determined and reported. Once a value is determined, the reference amplitude value can be based on one of the examples above.

[0800] In one example, N ref ={2,N TRP ,2N TRP} and one of the values ​​is determined and reported. Once a value is determined, the reference amplitude value can be based on one of the examples above.

[0801] In one example, N ref ={2,2+N TRP -1,2N TRP} and one of the values ​​is determined and reported. Once a value is determined, the reference amplitude value can be based on one of the examples above.

[0802] In one example, {2,3,4,N TRP ,2N TRP ,2+N TRP Any subset of N ref A set of values ​​is generated and one of the values ​​is determined and reported. Once a value is determined, the reference amplitude value can be based on one of the above examples.

[0803] In one example, for all layers (common to all layers), the number of reference amplitude values ​​N ref Determined and reported by the UE. The above examples can be examples for all layers.

[0804] In one embodiment, for the mTRP codebook, the coefficient W f The basis vectors (or indices of FD basis vectors) and W 2 FD Index (W 2 ) or FD index based on or relative to the FD beam index f * is shifted (or rotated or remapped), the FD beam index f * Can be a reference FD beam index.

[0805] In the Rel-16 type II codebook, the remapping process is as follows [9]: For l = 1, ..., v, let for i 2,4,l The index of for The index of the strongest coefficient of layer l, i 2,4,l Elements n 3,l The codebook index is relative to Remapped to So that after remapping, The index f is relative to Remapped to So that after remapping, the index of the strongest coefficient is i 2,4,l 、i 2,5,l and i 1,7,l The index indicates the amplitude coefficient, phase coefficient and bit map after remapping.

[0806] In one example, the strongest coefficient of layer l is represented by i 1,8,l ∈{0,1,…,2L-1} to identify, which is obtained as follows:

[0807]

[0808] For l=1,…,v.

[0809] In one example, for all ranks v∈{1,..,4} and l=1,…,v, the strongest coefficient of layer l is given by i 1,8,l ∈{0,1,…,2L-1}, which is obtained as follows

[0810] In one example, the reference FD beam index f * is the FD beam index f of the SCI (of the strongest TRP). Therefore, the SCI index f * is layer-common, ie, the same for all layers.

[0811] In one example, the reference FD beam index f * is the FD beam index of the SCI of the reference TRP. Therefore, the SCI index f * is layer-common, ie, the same for all layers.

[0812] In one example, the reference TRP can be configured via RRC, MAC-CE or DCI. In one example, the reference TRP can be fixed or determined in a predefined rule. In one example, the reference TRP can be determined by the UE and reported as part of the CSI. In one example, the strongest TRP can be the reference TRP.

[0813] In one example, the reference FD beam index f * is fixed (e.g., the lowest index among the FD basis vectors). * is layer-common, ie, the same for all layers.

[0814] In one example, the reference FD beam index f * Configured by NW via DCI, MAC-CE or RRC (layer common). The configured index can be one of the indices of the FD basis vector. Alternatively, 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.

[0815] In one example, the W associated with the strongest TRP (or reference TRP) f Basis vectors and W 2 FD Index (W 2 ) based on the FD beam index f * is shifted (or rotated or remapped FD indices), where f * According to one of the examples above in this article. For the remaining TRPs, no shift or rotation or remapping may be performed. Index f * is layer-common, ie, the same for all layers.

[0816] 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 * is shifted (or rotated or remapped FD indices), where f * According to one of the above examples (I.19.1 to I.19.3).

[0817] In one example, reference FD beam index is the FD beam index f of the SCI (of the strongest TRP, or reference TRP) of each layer l l Therefore, SCI index Are layer specific, i.e., one SCI for each layer.

[0818] In one example, for each layer l, refer to the FD beam index is fixed (e.g., the lowest index among the FD basis vectors). Are layer specific, i.e., one SCI for each layer.

[0819] In one example, reference FD beam index Configured by NW via DCI, MAC-CE or RRC (layer specific). The configured index can be one of the indices of the FD basis vector. Alternatively, the configured index can be different from the index of the FD basis vector. Configured index is layer-specific, i.e., for each layer one

[0820] In one example, for each layer l=1, ..., v, the W associated with the strongest TRP (or reference TRP) is f Basis vectors and W 2 FD Index (W 2 Columns) based on FD beam index is shifted (or rotated or remapped FD indices), where One of the above examples based on this article. Index is layer-specific, i.e., for each layer one

[0821] In one example, for each layer l=1,…,v, W associated with all TRPs f Basis vectors and W 2 FD Index (W 2 Columns) based on FD beam index is shifted (or rotated or remapped FD indices), where According to one of the above examples (I.19.6 to I.19.8).

[0822] In one embodiment, the UE is configured to report the FD relative to the reference FD index (f * ), where the reference FD index is according to one of the examples herein. In one example, a (relative) offset in FD is defined as δ f =ff * .

[0823] For N TRP > 1 TRP for TRP r∈{0,1…,N TRP A (relative) offset in the FD of -1} is defined as Among them, f r is (FD basis vector or W 2 )FD index of the coefficient matrix, and is the reference FD index. When the reference FD index is the same for all TRPs (i.e., there is only one reference FD index), And therefore δ r,f =f r -f * .

[0824] In one example, a (relative) offset is reported regardless of N ≤ N TRP Where N is the value of UE from N TRP The number of TRPs selected for CSI reporting among the TRPs. In one example, a (relative) offset is reported only when N>1 and is not reported when N=1.

[0825] In one example, one (relative) offset is used for each TRP (including the strongest TRP, which includes the TRP with reference FD index f * The strongest coefficient of is reported. Therefore, the total number of reported (relative) offsets is N.

[0826] In one example, a (relative) offset is applied to all but the strongest TRP (which includes the TRP with reference FD index f * Each TRP other than the strongest coefficient is reported. Therefore, the total number of reported (relative) offsets is N-1. The (relative) offset of the strongest TRP is fixed to 0.

[0827] In one example, one (relative) offset is reported only when N=2, and two (relative) offsets are reported when N∈{3,4} and not reported when N=1.

[0828] In one example, one (relative) offset is reported only when N∈{2,3}, and two (relative) offsets are reported when N=4 and not reported when N=1.

[0829] In one example, the (relative) offset is reported from a window indexed by the FD. In one example, the window is {0, 1, ..., X-1}. In one example, the window is {M init ,M init +1,…,M init +X-1}mod N 3 . Size (X) and / or start index (M init ) can be fixed or configured (e.g., via RRC) or reported by the UE.

[0830] For N>1 and / or v>1, the (relative) offset is reported according to at least one of the following examples.

[0831] • In one example, the (relative) offsets are reported in a layer-common manner, ie one (relative) offset is reported commonly across all layers l=1, ..., v.

[0832] • In one example, the (relative) offsets are reported in a layer specific manner, ie one (relative) offset is reported for each layer l=1, ..., v.

[0833] - In one example, the (relative) offsets are reported in a TRP-common manner, i.e., one (relative) offset is reported commonly across all TRPs.

[0834] - In one example, the (relative) offsets are reported in a TRP-specific manner, ie one (relative) offset is reported for each TRP.

[0835] - In one example, the (relative) offsets are reported in a TRP group specific manner, ie one (relative) offset is reported for each TRP group and the same offset is assumed for each TRP within a TRP group.

[0836] • In one example, the (relative) offsets are reported in a layer-common manner and in a TRP-common manner, i.e., one (relative) offset is reported commonly across all layers and all TRPs.

[0837] - In one example, the (relative) offsets are reported in a layer-common manner and in a TRP-specific manner, i.e., for each TRP, one (relative) offset is reported commonly across all layers.

[0838] - In one example, the (relative) offsets are reported in a layer-common manner and in a TRP-group specific manner, i.e., for each TRP group, one (relative) offset is reported commonly across all layers.

[0839] - In one example, the (relative) offsets are reported in a layer-specific manner and in a TRP-common manner, i.e., for each layer, one (relative) offset is reported commonly across all TRPs.

[0840] - In one example, the (relative) offsets are reported in a layer-specific manner and in a TRP-specific manner, i.e. for each layer and each TRP, one (relative) offset is reported.

[0841] In one embodiment, the UE is configured to report relative to a reference delay τ * The (relative) delay offset δ τ , wherein the reference delay is according to at least one of the following examples.

[0842] In one example, the reference delay τ * is 0 and therefore not reported.

[0843] In one example, the reference delay τ * In {0,1,2,…,T ref}, where T ref is fixed or configured via RRC, MAC-CE or DCI. In one example, T ref =4, 8, 16, 32.

[0844] In one example, the reference delay τ * In [0,τ max ], where τ max is fixed or configured via RRC, MAC-CE or DCI. In one example, τ * Use [0,τ max ] The x-bit codes of equidistant points in ] are originally selected / reported.

[0845] In one example, the delay offset δ τ is defined as δ τ =τ-τ * . Delay offset δ τ According to at least one of the following examples.

[0846] In one example, the delay offset δ τ In {0,1,2,…,T rel}, where T rel is fixed or configured via RRC, MAC-CE or DCI. In one example, T ref =T rel In one example, T rel =4,8,16,32.

[0847] In one example, the delay offset δ τ In [0,τ max,rel ], where τ max,rel is fixed or configured via RRC, MAC-CE or DCI. In one example, δ τ Use [0,τ max,rel ] is selected / reported by the y-bit code of the equidistant points in ]. In one example, τ max =τ max,rel .

[0848] In one example, the delay offset δ τ Expressed in phase form, for example, [0,2π]. In this case, for example, instead of "delay offset", we can call it "phase offset", "phase ramp / slope", "phase offset of delay difference between TRPs", etc.

[0849] In one example, when the delay offset δ τ When expressed in phase form, can be used to quantize [0,2π] for reporting. For example, n bit =2,3,4..., and so on.

[0850] In one example, n bit Can be fixed to 3 or 4 or 5...

[0851] In another example, n bit Can be configured by NW via DCI, MAC-CE or RRC.

[0852] In one example, n bit can be determined by predefined rules. For example, n bit =a+n p , where a is fixed (e.g., 0, 1, or 2), and n p It is for W 2 The number of bits configured in the phase component.

[0853] In one example, the delay offset δ can be reported using a DFT codebook τ For example, we can start with a 5 and the oversampling factor O 5 The phase offset associated with the delay offset is selected / reported in the DFT codebook of , which can be expressed as

[0854] Where n = 0, 1, ..., N 5 -1,

[0855] That is, for the delay offset δτ Reports the index of n. The payload size used for this can be given by bits are given.

[0856] In one example, N 5 Determined by predefined rules.

[0857] In one example, N 5 is fixed.

[0858] In one example, N 5 Configured by NW via DCI, MAC-CE or RRC.

[0859] In one example, O 5 Determined by predefined rules.

[0860] In one example, O 5 is fixed, for example, O 5 =1 or O 5 =2.

[0861] In one example, O 5 Configured by NW via DCI, MAC-CE or RRC.

[0862] In one example, any combination of the above examples can be applied.

[0863] For example, N 5 YesN 3 In this case, no additional configuration may be required.

[0864] In another example, N 5 Based on N 3 and the density of (associated) CSI-RS (DL RS) resources.

[0865] In another example, N 5 Number of SBs n based on configuration for (associated) CSI-RS (DL RS) resources / reporting / measurement bandwidth SB to define.

[0866] In another example, N 5 Number of SBs n based on configuration for (associated) CSI-RS (DL RS) resources / reporting / measurement bandwidth SB and CSI-RS density.

[0867] In another example, N 5 Number of RBs n based on configuration for (associated) CSI-RS (DL RS) resources / reporting / measurement bandwidthRB to define.

[0868] In another example, N 5 Number of RBs n based on configuration for (associated) CSI-RS (DL RS) resources / reporting / measurement bandwidth RB and CSI-RS density.

[0869] The quantization method described in each of the examples above (e.g. Or DFT codebook z n ) can be applied to the delta described in the following example r,τ .

[0870] For N TRP >1 TRP, TRP r∈{0,1…,N TRP A (relative) delay offset of -1} is defined as Among them, τ r is the delay value of TRP r, and is the reference delay value. When the reference delay value is the same for all TRPs (i.e., there is only one reference delay), And therefore δ r,τ =τ r -τ * .

[0871] In one example, a (relative) delay offset is reported regardless of N ≤ N TRP Where N is the value of UE from N TRP The number of TRPs selected for CSI reporting among the TRPs. In one example, a (relative) delay offset is reported only when N>1 and is not reported when N=1.

[0872] In one example, one (relative) delay offset is reported for each TRP (including the strongest TRP, which includes the strongest coefficient). Therefore, the total number of reported (relative) delay offsets is N.

[0873] In one example, one (relative) delay offset is reported for each TRP except the strongest TRP (which includes the strongest coefficient). Therefore, the total number of reported (relative) offsets is N-1. The (relative) delay offset of the strongest TRP is fixed to 0.

[0874] In one example, one (relative) delay offset is only reported when N=2, and two (relative) delay offsets are reported when N∈{3,4} and not reported when N=1.

[0875] In one example, one (relative) delay offset is reported only when N∈{2,3}, and two (relative) delay offsets are reported when N=4 and not reported when N=1.

[0876] For N>1 and / or v>1, the (relative) delay offset (mentioned above, e.g., δ τ (δ r,τ )) is reported according to at least one of the following examples.

[0877] • In one example, the (relative) delay offsets are reported in a layer-common manner, ie one (relative) delay offset is reported commonly across all layers l=1, ..., v.

[0878] • In one example, the (relative) delay offsets are reported in a layer specific manner, ie one (relative) delay offset is reported for each layer l=1, ..., v.

[0879] • In one example, the (relative) delay offset is reported in a TRP-common manner, i.e., one (relative) delay offset is reported commonly across all TRPs.

[0880] • In one example, the (relative) delay offset is reported in a TRP-specific manner, ie one (relative) delay offset is reported for each TRP.

[0881] - In one example, the (relative) delay offset is reported in a TRP group specific manner, i.e., one (relative) delay offset is reported for each TRP group, and the same delay offset is assumed for each TRP within a TRP group.

[0882] • In one example, the (relative) delay offset is reported in a layer-common manner and in a TRP-common manner, i.e., one (relative) delay offset is reported commonly across all layers and all TRPs.

[0883] • In one example, the (relative) delay offset is reported in a layer-common manner and in a TRP-specific manner, i.e., for each TRP, one (relative) delay offset is reported commonly across all layers.

[0884] • In one example, the (relative) delay offset is reported in a layer-common manner and in a TRP-group-specific manner, i.e., for each TRP group, one (relative) delay offset is reported commonly across all layers.

[0885] • In one example, the (relative) delay offset is reported in a layer-specific manner and in a TRP-common manner, i.e., for each layer, one (relative) delay offset is reported commonly across all TRPs.

[0886] • In one example, the (relative) delay offset is reported in a layer-specific manner and in a TRP-specific manner, i.e., for each layer and each TRP, one (relative) delay offset is reported.

[0887] In one embodiment, the UE is configured to report relative to the reference frequency g * The (relative) frequency shift δ g , wherein the reference frequency is according to at least one of the following examples.

[0888] In one example, the reference frequency g * is 0 and therefore not reported.

[0889] In one example, the reference frequency g * In {0,1,2,…,F ref}, where F ref is fixed or configured via RRC, MAC-CE or DCI. In one example, F ref =4,8,16,32.

[0890] In one example, the reference frequency g * In [0,g max ], where g max is fixed or configured via RRC, MAC-CE or DCI. In one example, g * Use [0,g max ] The x-bit codes of equidistant points in ] are originally selected / reported.

[0891] In one example, the frequency offset δ g is defined as δ g =gg * . Frequency offset δ g According to at least one of the following examples.

[0892] In one example, the frequency shift δ g In {0,1,2,…,F rel}, where F rel is fixed or configured via RRC, MAC-CE or DCI. In one example, F ref =F rel In one example, F rel =4,8,16,32.

[0893] In one example, the frequency shift δ g In [0,g max,rel ], where g max,rel is fixed or configured via RRC, MAC-CE or DCI. In one example, δg Use [0,g max,rel ] is selected / reported. In one example, g max =g max,rel .

[0894] For N TRP >1 TRP, TRP r∈{0,1…,N TRP A (relative) frequency offset of -1} is defined as Among them, g r is the frequency value of TRP r, and is the reference frequency value. When the reference frequency value is the same for all TRPs (i.e., there is only one reference frequency), And therefore δ r,g =g r -g * .

[0895] In one example, a (relative) frequency offset is reported regardless of N ≤ N TRP Where N is the value of UE from N TRP The number of TRPs selected for CSI reporting among the TRPs. In one example, a (relative) frequency offset is reported only when N>1 and is not reported when N=1.

[0896] In one example, one (relative) frequency offset is reported for each TRP (including the strongest TRP, which includes the strongest coefficient). Therefore, the total number of reported (relative) frequency offsets is N.

[0897] In one example, one (relative) frequency offset is reported for each TRP except the strongest TRP (which includes the strongest coefficient). Therefore, the total number of reported (relative) frequencies is N-1. The (relative) frequency offset of the strongest TRP is fixed to 0.

[0898] In one example, one (relative) frequency offset is only reported when N=2, and two (relative) frequency offsets are reported when N∈{3,4} and not reported when N=1.

[0899] In one example, one (relative) frequency offset is reported only when N∈{2,3}, and two (relative) frequency offsets are reported when N=4 and not reported when N=1.

[0900] For N>1 and / or v>1, the (relative) frequency offset is reported according to at least one of the following examples.

[0901] • In one example, the (relative) frequency offsets are reported in a layer-common manner, ie one (relative) frequency offset is reported commonly across all layers l=1, ..., v.

[0902] • In one example, the (relative) frequency offsets are reported in a layer specific manner, ie one (relative) frequency offset is reported for each layer l=1, ..., v.

[0903] • In one example, the (relative) frequency offset is reported in a TRP-common manner, i.e., one (relative) offset is reported commonly across all TRPs.

[0904] - In one example, the (relative) frequency offsets are reported in a TRP-specific manner, ie one (relative) frequency offset is reported for each TRP.

[0905] - In one example, the (relative) offsets are reported in a TRP group specific manner, i.e. one (relative) frequency offset is reported for each TRP group and the same frequency offset is assumed for each TRP within a TRP group.

[0906] • In one example, the (relative) frequency offset is reported in a layer-common manner and in a TRP-common manner, i.e., one (relative) frequency offset is reported commonly across all layers and all TRPs.

[0907] • In one example, the (relative) frequency offsets are reported in a layer-common manner and in a TRP-specific manner, i.e., for each TRP, one (relative) frequency offset is reported commonly across all layers.

[0908] - In one example, the (relative) frequency offsets are reported in a layer-common manner and in a TRP-group-specific manner, i.e., for each TRP-group, one (relative) frequency offset is reported commonly across all layers.

[0909] • In one example, the (relative) frequency offset is reported in a layer-specific manner and in a TRP-common manner, i.e., for each layer, one (relative) frequency offset is reported commonly across all TRPs.

[0910] • In one example, the (relative) frequency offset is reported in a layer-specific manner and in a TRP-specific manner, i.e., for each layer and each TRP, one (relative) frequency offset is reported.

[0911] In one embodiment, for one or more of the examples herein, the reporting of the relative offset can be turned on / off (or enabled). For example, the UE can be configured with information about whether the relative offset is reported by the UE. If turned on, the UE reports the relative offset; otherwise it does not report. This information can be provided via, for example, RRC, MAC-CE, or DCI.

[0912] In one embodiment, the UE is configured to report one of the relative offset types (eg, offset in FD index, delay offset, and frequency offset).

[0913] In one example, the UE can be configured to report the FD index f * The relative offset in .

[0914] In one example, the UE can be configured to report relative to τ * The relative delay offset.

[0915] In one example, the UE can be configured to report relative to g * The relative frequency shift.

[0916] In one embodiment, the UE is configured to report two of the relative offset types (eg, offset in FD index, delay offset, and frequency offset).

[0917] In one example, the UE can be configured to report the FD index f * The relative shift in and relative to τ * The relative delay offset.

[0918] In one example, the UE can be configured to report the relative offset in the FD index and relative to g * The relative frequency shift.

[0919] In one example, the UE can be configured to report relative to τ * The relative delay offset and relative to g * The relative frequency shift.

[0920] In one embodiment, the UE is configured to report all relative offset types (eg, offset in FD index, delay offset, and frequency offset).

[0921] In one example, the UE can be configured to report the FD index f * The relative shift in and relative to τ * The relative delay offset and relative to g * The relative frequency shift.

[0922] In one embodiment, for one or more of the examples herein, reporting of relative offsets can depend on the CB type.

[0923] In one example, the reporting of the relative offset can be configured only when the configured codebook type is a decoupled codebook (CB1), where CB1 includes the SD basis vectors (W) per TRP / TRP group. 1 ), FD basis vectors for each TRP / TRP group (Wf ), coefficient W for each TRP / TRP group 2 , and inter-TRP components including common amplitude / common phase / reference amplitude.

[0924] In one example, the reporting of the relative offset can be configured only when the configured codebook type is a joint codebook (CB2), where CB2 includes the SD basis vectors (W) per TRP / TRP group. 1 ), the FD basis vectors across TRP (W f ), and the joint coefficient component W across TRPs 2 .

[0925] In one example, the reporting of the relative offset can be configured only when the configured codebook type is a joint codebook (CB2), where CB2 includes the SD basis vectors (W) per TRP / TRP group. 1 ), FD basis vectors for each TRP / TRP group (W f ), and the joint coefficient component W across TRPs 2 .

[0926] In one example, the reporting of the relative offset can be configured only when the configured codebook type is a codebook (CB3) including (SD, FD) basis vectors, wherein CB3 includes a joint SD-FD basis vector component per TRP / TRP group and a combined coefficient component of the joint SD-FD basis vector component. In one example, the joint SD-FD basis vector component is included in 2N 1 N 2 N 3 An oversampled set of DFT vectors on (i.e., the product of the SD basis dimension and the FD basis dimension).

[0927] In one example, the report of the relative offset can be configured only when the configured codebook type is CB1 and / or CB2 and / or CB3.

[0928] In one embodiment, the UE is configured with CSI reporting based on the mTRP (or D-MIMO or C-JT) codebook via a 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 one example, one of the two modes is configured via higher layers (e.g., via parameter codebookMode).

[0929] Mode 1: SD / FD base selection per TRP / TRP group. Example Formula (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.

[0930]

[0931] Mode 2: SD-based selection and union (across N TRP TRP)FD base selection. Example Formula (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.

[0932] or

[0933] In one example, W in one or more of the embodiments herein 2 It can be in the embodiment

[0934] In one example, two modes can share similar detailed designs, such as parameter combinations, basis selection, TRP (group) selection, reference amplitude, Quantitative solution.

[0935] In one example, the parameter combination can be a parameter tuple for a conventional type IICJT codebook, such as L, p v ,β, or a parameter tuple for port selection type IICJT codebook, such as,M,α,β.

[0936] • In one example, the basis selection scheme can be the SD basis selection and / or the FD basis selection scheme described herein.

[0937] 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 a phase and an amplitude and they are selected as a corresponding codebook, and CSI subset restriction.

[0938] In one embodiment, the UE reports the (relative) offset (e.g., δ f ) and / or (relative) delay offset (e.g., δ τ ) and / or (relative) frequency offset (e.g., δ g) (i.e., relative FD offset is not reported when Mode 2 codebook is configured). In one example, the UE reports relative offset in FD. In one example, the UE reports relative delay offset. In one example, the UE reports (relative) frequency offset. In one example, the UE reports any combination of the three.

[0939] In one example, δ f According to at least one example of one or more embodiments of this document.

[0940] In one example, δ τ According to at least one example of one or more embodiments of this document.

[0941] In one example, δ g According to at least one example of one or more embodiments of this document.

[0942] Alternatively, when the Mode 1 codebook is configured, the UE is expected to report the relative FD offset, and when the Mode 2 codebook is configured, the UE is not expected to report the relative FD offset.

[0943] In one embodiment, the UE reports the (relative) offset (e.g., δ f ), (relative) delay offset (e.g., δ τ ) and / or (relative) frequency offset (e.g., δ g ) (i.e., relative FD offset is not reported when Mode 1 codebook is configured). In one example, the UE reports relative offset in FD. In one example, the UE reports relative delay offset. In one example, the UE reports (relative) frequency offset. In one example, the UE reports any combination of the three.

[0944] In one example, δ f According to at least one example of one or more embodiments of this document.

[0945] In one example, δ τ According to at least one example of one or more embodiments of this document.

[0946] In one example, δ g According to at least one example of one or more embodiments of this document.

[0947] Alternatively, when the Mode-2 codebook is configured, the UE is expected to report the relative FD offset, and when the Mode-1 codebook is configured, the UE is not expected to report the relative FD offset.

[0948] In one embodiment, the UE reports the (relative) offset (e.g., δ f), (relative) delay offset (e.g., δ τ ) and / or (relative) frequency offset (e.g., δ g ) In one example, the UE reports the relative offset in FD. In one example, the UE reports the relative delay offset. In one example, the UE reports the (relative) frequency offset. In one example, the UE reports any combination of the three.

[0949] In one example, δ f According to at least one example of one or more embodiments of this document.

[0950] In one example, δ τ According to at least one example of one or more embodiments of this document.

[0951] In one example, δ g According to at least one example of one or more embodiments of this document.

[0952] Alternatively, the UE is expected to report the relative FD offset for the two codebook modes.

[0953] In one embodiment, when an mTRP codebook (with N>1 TRP or NZP CSI-RS resources) is configured, the UE (e.g., via higher layers) is configured to report the (relative) offset (e.g., δ f ), (relative) delay offset (e.g., δ τ ) and / or (relative) frequency offset (e.g., δ g ). In one example, the UE reports a relative offset in FD. In one example, the UE reports a relative delay offset. In one example, the UE reports a (relative) frequency offset. In one example, the UE is configured to report any combination of the three.

[0954] In one example, δ f According to at least one example of one or more embodiments of this document.

[0955] In one example, δ τ According to at least one example of one or more embodiments of this document.

[0956] In one example, δ g According to at least one example of one or more embodiments of this document.

[0957] In one embodiment, the UE is configured (e.g., via higher layers) using new higher layer parameters to report the (relative) offset (e.g., δ) in the FD only for Mode 1 or only for Mode 2 or for Mode 1 or Mode 2. f ), (relative) delay offset (e.g., δτ ) and / or (relative) frequency offset (e.g., δ g ). For example, the parameter relativeOffsetEnabledMode1orMode2 is used to indicate which mode is configured to report the relative offset. In one example, relativeOffsetEnabledMode1orMode2 can have two integer values, such as 1 and 2. In one example, the UE is configured to report the relative offset in FD. In one example, the UE is configured to report the relative delay offset. In one example, the UE is configured to report the (relative) frequency offset. In one example, the UE is configured to report any combination of the three.

[0958] In one example, δ f According to at least one example of one or more embodiments of this document.

[0959] In one example, δ τ According to at least one example of one or more embodiments of this document.

[0960] In one example, δ g According to at least one example of one or more embodiments of this document.

[0961] In one embodiment, the UE decides via parameters in UCI Part 1 whether to report the (relative) offset in FD (e.g., δ f ), (relative) delay offset (e.g., δ τ ) and / or (relative) frequency offset (e.g., δ g ). In one example, the UE decides whether to report the relative offset in FD. In one example, the UE decides whether to report the relative delay offset. In one example, the UE decides whether to report the (relative) frequency offset. In one example, the UE decides whether to report any combination of the three.

[0962] In one example, δ f According to at least one example of one or more embodiments of this document.

[0963] In one example, δ τ According to at least one example of one or more embodiments of this document.

[0964] In one example, δ g According to at least one example of one or more embodiments of this document.

[0965] In one embodiment, the UE reports the (relative) offset (e.g., δ f ), (relative) delay offset (e.g., δ τ) and / or (relative) frequency offset (e.g., δ g )’s UE capabilities.

[0966] In one example, the UE reports its capability to report a (relative) offset in the FD as UE capability. If the NW receives this UE capability, the NW needs to follow the UE capability and be able to configure based on the UE capability.

[0967] In one example, the UE reports its ability to report a (relative) delay offset as a UE capability. If the NW receives this UE capability, the NW needs to follow the UE capability and be able to configure based on the UE capability.

[0968] In one example, the UE reports its capability to report (relative) frequency offset as UE capability. If the NW receives this UE capability, the NW needs to follow the UE capability and be able to configure based on the UE capability.

[0969] In one example, the UE reports its capability to report any combination of the above three offset components as UE capability. If the NW receives this UE capability, the NW needs to follow the UE capability and be able to configure based on the UE capability.

[0970] In one embodiment, the UE reports the UE capabilities regarding possible mode operation among two modes.

[0971] In one example, the UE reports only Mode 1 as the UE capability. If the NW receives this UE capability, the NW can configure only Mode 1 to the UE.

[0972] In one example, the UE reports only Mode 2 as the UE capability. If the NW receives this UE capability, the NW may configure only Mode 2 to the UE.

[0973] In one example, the UE reports Mode 1 and Mode 2 as UE capabilities. If the NW receives the UE capabilities, the NW can configure Mode 1 or Mode 2 to the UE.

[0974] In one embodiment, both modes support the same set of rank candidates That is, it can be configured for mode 1 or mode 2 of any rank.

[0975] In one example,

[0976] In one example,

[0977] In another example,

[0978] In one embodiment, each mode i supports a different set of rank candidates

[0979] In one example, low rank (e.g., ) can be configured for mode 1, and high rank (e.g., ) can be configured for mode 2.

[0980] In one example, low rank (e.g., ) for mode 2, and high rank (e.g., ) for mode 1.

[0981] In one example, low rank (e.g., ) for mode 1, and any rank (e.g., For mode 2.

[0982] In one example, low rank (e.g., ) for mode 2, and any rank (e.g., ) is used for mode 2.

[0983] In one embodiment, there are common codebook parameters for Mode 1 and Mode 2, as well as mode specific codebook parameters.

[0984] In one example, L (or L sum or L r ) values ​​are common parameters for both Mode 1 and Mode 2, i.e., the same value can be configured for both Mode 1 and Mode 2.

[0985] In one example, L (or L sum or L r ) values ​​are mode-specific parameters, i.e., independent L values ​​can be configured for each mode.

[0986] In one example, M v (or or M v,r ) values ​​are common parameters for both Mode 1 and Mode 2, i.e., M can be configured for both Mode 1 and Mode 2. v (or or M v,r )

[0987] In one example, M v (or M v,sum or M v,r ) values ​​are mode-specific parameters, i.e., independent M can be configured for each mode v (or M v,sum or M v,r ) values.

[0988] In one embodiment, the UE is configured with CSI reporting for N≥1 TRPs (wherein a TRP corresponds to an NZP CSI-RS resource or a subset of CSI-RS antenna ports within an NZP CSI-RS resource) based on an mTR PCJT codebook, wherein the codebook is configured according to (at least) one of the examples herein.

[0989] In one embodiment, according to (at least) one of the following examples, the FD basis vectors for N≥1 TRPs and the relative offsets in FD are reported as part of the CSI report.

[0990] In one example, (Alt1) is a relative offset (e.g., δ) in the FD for each of the N TRPs (or each of the N-1 TRPs, e.g., excluding the reference TRP) f or δ f,r ) is reported and used for all TRPs v A common set of FD basis vectors is reported as part of the CSI report. Therefore, the UE reports {δ f,r :r=1,…,N-1}(or {δ f,r :r=1,…,N}) and M v A set of FD basis vectors.

[0991] In one example, the reference TRP can be configured by RRC, MAC-CE or DCI.

[0992] In one example, the reference TRP can be determined and reported by the UE. In one example, the reference TRP can be the strongest TRP.

[0993] In one example, the reference TRP can be fixed using predefined rules. (eg, TRP including SCI).

[0994] In one example, (Alt2) is a relative offset (e.g., δ) in the FD for each of the N TRPs (or each of the N-1 TRPs, e.g., excluding the reference TRP) f or δ f,r ) is reported and used for each TRP r's M v (or M v,r ) FD basis vectors are reported as part of the CSI report. Therefore, the UE reports {δ f,r :r=1,…,N-1}(or {δ f,r :r=1,…,N}) and M v,r N sets of FD basis vectors

[0995] In one example, the reference TRP can be configured by RRC, MAC-CE or DCI.

[0996] In one example, the reference TRP can be determined and reported by the UE. In one example, the reference TRP can be the strongest TRP.

[0997] In one example, the reference TRP can be fixed using predefined rules. (eg, TRP including SCI).

[0998] In one example, (Alt3) is used for M of all TRPs (across TRPs) v A common set of FD basis vectors is reported as part of the CSI report, and there is no reporting of relative offsets.

[0999] In one example, (Alt4) M for each TRP r v (or M v,r ) FD basis vectors as part of the CSI report, and there is no reporting of relative offsets.

[1000] In one example, Alt1 and Alt2 are associated with Mode 1 and Mode 2, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt1 is used for FD basis vector reporting when Mode 1 is configured, and Alt2 is used for FD basis vector reporting when Mode 2 is configured.

[1001] In one example, Alt1 and Alt3 are associated with Mode 1 and Mode 2, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt1 is used for FD basis vector reporting when Mode 1 is configured, and Alt3 is used for FD basis vector reporting when Mode 2 is configured.

[1002] In one example, Alt1 and Alt4 are associated with Mode 1 and Mode 2, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt1 is used for FD basis vector reporting when Mode 1 is configured, and Alt4 is used for FD basis vector reporting when Mode 2 is configured.

[1003] In one example, Alt2 and Alt3 are associated with Mode 1 and Mode 2, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt2 is used for FD basis vector reporting when Mode 1 is configured, and Alt3 is used for FD basis vector reporting when Mode 2 is configured.

[1004] In one example, Alt2 and Alt4 are associated with Mode 1 and Mode 2, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt2 is used for FD basis vector reporting when Mode 1 is configured, and Alt4 is used for FD basis vector reporting when Mode 2 is configured.

[1005] In one example, Alt3 and Alt4 are associated with Mode 1 and Mode 2, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt3 is used for FD basis vector reporting when Mode 1 is configured, and Alt4 is used for FD basis vector reporting when Mode 2 is configured.

[1006] In one example, Alt1 and Alt2 are associated with Mode 2 and Mode 1, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt1 is used for FD basis vector reporting when Mode 2 is configured, and Alt2 is used for FD basis vector reporting when Mode 1 is configured.

[1007] In one example, Alt1 and Alt3 are associated with Mode 2 and Mode 1, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt1 is used for FD basis vector reporting when Mode 2 is configured, and Alt3 is used for FD basis vector reporting when Mode 1 is configured.

[1008] In one example, Alt1 and Alt4 are associated with Mode 2 and Mode 1, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt1 is used for FD basis vector reporting when Mode 2 is configured, and Alt4 is used for FD basis vector reporting when Mode 1 is configured.

[1009] In one example, Alt2 and Alt3 are associated with Mode 2 and Mode 1, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt2 is used for FD basis vector reporting when Mode 2 is configured, and Alt3 is used for FD basis vector reporting when Mode 1 is configured.

[1010] In one example, Alt2 and Alt4 are associated with Mode 2 and Mode 2, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt2 is used for FD basis vector reporting when Mode 2 is configured, and Alt4 is used for FD basis vector reporting when Mode 1 is configured.

[1011] In one example, Alt3 and Alt4 are associated with Mode 2 and Mode 1, respectively, where Mode 1 and Mode 2 are described herein, i.e., Alt3 is used for FD basis vector reporting when Mode 2 is configured, and Alt4 is used for FD basis vector reporting when Mode 1 is configured.

[1012] In one embodiment, one or more examples herein can be configured by RRC, MAC-CE or DCI signaling.

[1013] In one embodiment, Mode 1 can be associated with a fixed Alt x from Alt1-Alt4 herein, and one of the Alts herein can be configured for Mode 2 via RRC, MAC-CE, or DCI signaling.

[1014] • In one example, Mode 1 can be associated with fixed Alt1, and one of the Alts (from Alt1-Alt4) can be configured for Mode 2 via RRC, MAC-CE, or DCI signaling.

[1015] • In one example, Mode 1 can be associated with fixed Alt2, and one of the Alts (from Alt1-Alt4) can be configured for Mode 2 via RRC, MAC-CE, or DCI signaling.

[1016] • In one example, Mode 1 can be associated with fixed Alt3, and one of the Alts (from Alt1-Alt4) can be configured for Mode 2 via RRC, MAC-CE or DCI signaling.

[1017] • In one example, Mode 1 can be associated with fixed Alt4, and one of the Alts (from Alt1-Alt4) can be configured for Mode 2 via RRC, MAC-CE or DCI signaling.

[1018] In one embodiment, Mode 2 can be associated with a fixed Alt x from Alt1-Alt4 herein, and one of the Alts herein can be configured for Mode 1 via RRC, MAC-CE, or DCI signaling.

[1019] • In one example, Mode 2 can be associated with fixed Alt1, and one of the Alts (from Alt1-Alt4) can be configured for Mode 1 via RRC, MAC-CE, or DCI signaling.

[1020] • In one example, Mode 2 can be associated with fixed Alt2, and one of the Alts (from Alt1-Alt4) can be configured for Mode 1 via RRC, MAC-CE, or DCI signaling.

[1021] • In one example, Mode 2 can be associated with fixed Alt3, and one of the Alts (from Alt1-Alt4) can be configured for Mode 1 via RRC, MAC-CE or DCI signaling.

[1022] • In one example, Mode 2 can be associated with fixed Alt4, and one of the Alts (from Alt1-Alt4) can be configured for Mode 1 via RRC, MAC-CE or DCI signaling.

[1023] In one embodiment, one of the Alts herein can be configured for Mode 1 or Mode 2 via RRC, MAC-CE or DCI signaling.

[1024] • In one example, one of the Alts (from Alt1-Alt4) can be configured for Mode 1 via RRC, MAC-CE or DCI signaling.

[1025] • In one example, one of the Alts (from Alt1-Alt4) can be configured for Mode 2 via RRC, MAC-CE or DCI signaling.

[1026] In one embodiment, one of the Alts herein can be fixed for Mode 1 or Mode 2.

[1027] In one example, one of the Alts (from Alt1-Alt4) can be fixed for Mode 1.

[1028] In one example, one of the Alts (from Alt1-Alt4) can be fixed for Mode 2.

[1029] Fig.13 An example method 1300 performed by a UE in a wireless communication system according to an embodiment of the present disclosure is shown. Fig.13 The method 1300 can 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 2 The method 1300 is for illustration only, and other embodiments can be used without departing from the scope of the present disclosure.

[1030] The method begins when the UE receives information about trp The CSI report information associated with the antenna port groups (1310). For example, in 1310, N trp >1. Then, the UE determines whether N≤N trp The UE may determine the CSI report associated with the antenna port groups (1320). For example, in 1320, the UE may determine the CSI report based on the information. In various embodiments, N∈{2,3,…,N trp} and the CSI report includes: a first indicator, which indicates for each layer l=1,…,v that it includes a frequency domain (FD) basis matrix W f,l M of the column vThe index of the vector, where v≥1 is the rank value; and a second indicator indicating the FD offset value of each of the N antenna port groups The index of r∈{1,…,N}, r≠r * , and r * is the index of the reference antenna port group. For example, the FD basis matrix associated with the rth antenna port group is based on W f,l and to be sure.

[1031] In various embodiments, the FD basis matrix associated with the rth antenna port group is given by Given, where Based on the FD offset value To rotate M v In various embodiments, N 3 It is M v The length of each of the vectors, and O 3 ≥1 is the oversampling factor. For example, when O 3 =1, And the payload of the second indicator is (N-1) In another example, Among them, X<N 3 O 3 is the maximum value of the FD offset value, and the payload of the second indicator is (N-1) In another example, when O 3 =4, And the payload of the second indicator is (N-1) bits.

[1032] In various embodiments, the UE may also send a signal indicating that the UE is capable of supporting 0 3 =4 UE capability information. In various embodiments, the received information includes information about N trp NZP CSI-RS resource information, each NZP CSI-RS resource is associated with N trp The UE measures N trp The UE may determine a CSI report based on the measurement by using a plurality of NZP CSI-RS resources. Thereafter, the UE may send a CSI report (1330). For example, in 1330, the CSI report may include a first indicator and a second indicator.

[1033] 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 shown in the flow charts herein. For example, although shown as a series of steps, the individual 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.

[1034] Fig.14 A block diagram of a terminal (or user equipment (UE)) according to an embodiment of the present disclosure is shown. Fig.14 Corresponds to Figure 3 Example of a UE.

[1035] like Fig.14 As shown, the UE according to the embodiment may include a transceiver 1410, a memory 1420 and a processor 1430. The transceiver 1410, the memory 1420 and the processor 1430 of the UE may operate according to the communication method of the above-mentioned UE. However, the components of the UE are not limited thereto. For example, the UE may include more or less components than the above-mentioned components. In addition, the processor 1430, the transceiver 1410 and the memory 1420 may be implemented as a single chip. In addition, the processor 1430 may include at least one processor.

[1036] The transceiver 1410 is collectively referred to as a UE receiver and a UE transmitter, and can send signals to / receive signals from a base station or a network entity. The signals sent to or received from a base station or a network entity may include control information and data. The transceiver 1410 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for amplifying the frequency of the low noise and down-converting the received signal. However, this is merely an example of the transceiver 1410, and the components of the transceiver 1410 are not limited to the RF transmitter and the RF receiver.

[1037] In addition, the transceiver 1410 may receive a signal through a wireless channel and output it to the processor 1430 , and transmit a signal output from the processor 1430 through a wireless channel.

[1038] The memory 1420 may store programs and data required for the operation of the UE. In addition, the memory 1420 may store control information or data included in a signal obtained by the UE. The memory 1120 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.

[1039] The processor 1430 may control a series of processes so that the UE operates as described above. For example, the transceiver 1410 may receive a data signal including a control signal sent by a base station or a network entity, and the processor 1430 may determine a result of receiving the control signal and the data signal sent by the base station or the network entity.

[1040] Fig.15 A block diagram of a base station according to an embodiment of the present disclosure is shown. Fig.15 Corresponds to Figure 2 Example of a gNB.

[1041] like Fig.15 As shown, the base station according to the embodiment may include a transceiver 1510, a memory 1520 and a processor 1530. The transceiver 1510, the memory 1520 and the processor 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 more or less components than those described above. In addition, the processor 1530, the transceiver 1510 and the memory 1520 may be implemented as a single chip. In addition, the processor 1530 may include at least one processor.

[1042] 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 (UE) or a network entity. The signals sent to or received from the terminal or network entity 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 amplifying the frequency of the low noise and down-converting the received signal. However, this is merely an example of the transceiver 1510, and the components of the transceiver 1510 are not limited to the RF transmitter and the RF receiver.

[1043] In addition, the transceiver 1510 may receive a signal through a wireless channel and output it to the processor 1530 , and transmit a signal output from the processor 1530 through a wireless channel.

[1044] The memory 1520 may store programs and data required for the base station operation. In addition, the memory 1520 may store control information or data included in the signal obtained by the base station. The memory 1520 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.

[1045] The processor 1530 may control a series of processes so that the base station operates as described above. For example, the transceiver 1510 may receive a data signal including a control signal transmitted by a terminal, and the processor 1530 may determine a result of receiving the control signal and the data signal transmitted by the terminal.

[1046] In the above-mentioned embodiment of the present disclosure, the elements included in the present disclosure are represented in singular or plural form according to the embodiment. However, for the convenience of explanation, the singular or plural form is appropriately selected, and the present disclosure is not limited thereto. Therefore, the element represented in plural form may also be configured as a single element, and the element represented in singular form may also be configured as multiple elements.

[1047] 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. In general, 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.

[1048] Although the disclosure has been described with exemplary embodiments, various variations and modifications may be conceived by those skilled in the art. The disclosure is intended to include these variations and modifications that fall within the scope of the appended claims. Any description in this application should not be construed as meaning that any particular element, step or function is an essential element that must be included within the scope of the claims. The scope of the patent subject matter is defined by the claims.

Claims

1. A user equipment (UE), comprising: transceiver, is configured to receive information about the N trp The information of the channel state information (CSI) report associated with the antenna port groups, where N trp >1; A processor operatively coupled to the transceiver, wherein the processor is configured to determine, based on the information, trp CSI reports associated with antenna port groups, where N∈{2, 3, ..., N trp }, where the CSI report includes: The first indicator, for each layer l=1, ..., v, includes a frequency domain (FD) basis matrix W f，l M of the column v The indices of vectors, where v ≥ 1 is the rank value, and A second indicator indicating the FD offset value of each of the N antenna port groups The index of r∈{1,...,N}, r≠r * And r * is the index of the reference antenna port group, and The transceiver is further configured to send a CSI report including the first indicator and the second indicator, Among them, the FD basis matrix associated with the rth antenna port group is based on W f，l and Sure.

2. The UE according to claim 1, wherein: The FD basis matrix associated with the rth antenna port group is given by Given, where Is based on the FD offset value To rotate the M v The rotation vector of a vector.

3. The UE according to claim 2, wherein: N3 is the M v The length of each of the vectors, and O3≥1 is the oversampling factor.

4. The UE according to claim 3, wherein: When O3=1, and the payload of the second indicator is bits.

5. The UE according to claim 3, wherein: where X<N3O3> is the maximum value of the FD offset value, and the payload of the second indicator is bits Among them, when O3=4, and the payload of the second indicator is bits, and The transceiver is further configured to send UE capability information indicating that the UE can support O3=4.

6. The UE according to claim 1, wherein: The information includes information about N trp NZP CSI-RS resources, each NZP CSI-RS resource is associated with the N trp associated with one of the antenna port groups, The processor is further configured to measure the N trp NZP CSI-RS resources, and The CSI reports are determined based on measurements.

7. A base station (BS), comprising: processor, configured to identify the trp The information of the channel state information (CSI) report associated with the antenna port groups, where N trp >1; and A transceiver, operatively coupled to the processor, the transceiver being configured to: Send information; and Receive and N≤N trp CSI reports associated with antenna port groups, where N∈{2, 3, ..., N trp }, where the CSI report includes: The first indicator, for each layer l=1, ..., v, includes a frequency domain (FD) basis matrix W f，l M of the column v The indices of vectors, where v ≥ 1 is the rank value, and A second indicator indicating the FD offset value of each of the N antenna port groups The index of r∈{1,...,N}, r≠r * And r * is the index of the reference antenna port group, Among them, the FD basis matrix associated with the rth antenna port group is based on W f，l and Sure.

8. The BS according to claim 7, wherein: The FD basis matrix associated with the rth antenna port group is given by Given, where Based on the FD offset value To rotate the M v The rotation vector of a vector.

9. The BS according to claim 8, wherein: N3 is the M v The length of each of the vectors, and O3≥1 is the oversampling factor.

10. The BS according to claim 9, wherein: When O3=1, and the payload of the second indicator is bits, Among them, where X<N3O3 is the maximum value of the FD offset, and the payload of the second indicator is bits, and Among them, when O3=4, and the payload of the second indicator is bits.

11. The BS according to claim 10, wherein: The transceiver is further configured to receive, from a user equipment (UE), UE capability information indicating that the UE is capable of supporting O3=4.

12. The BS according to claim 7, wherein: The information includes information about N trp NZP CSI-RS resources, each NZP CSI-RS resource is associated with the N trp associated with one of the antenna port groups, and CSI report and the N trp NZP CSI-RS resources are associated.

13. A method performed by a user equipment (UE), the method comprising: Receive information about trp The information of the channel state information (CSI) report associated with the antenna port groups, where N trp >1; Based on the information, determine the trp CSI reports associated with antenna port groups, where N∈{2, 3, ..., N trp }, where the CSI report includes: The first indicator, for each layer l=1, ..., v, includes a frequency domain (FD) basis matrix W f，l M of the column v The indices of vectors, where v ≥ 1 is the rank value, and A second indicator indicating the FD offset value of each of the N antenna port groups The index of r∈{1,...,N}, r≠r * And r * is the index of the reference antenna port group; and sending a CSI report including a first indicator and a second indicator, Among them, the FD basis matrix associated with the rth antenna port group is based on W f，l and Sure.

14. The method according to claim 13, wherein: The FD basis matrix associated with the rth antenna port group is given by Given, where Is based on the FD offset value To rotate the M v The rotation vector of a vector.

15. The method according to claim 14, wherein: N3 is the M v The length of each of the vectors, and O3 ≥ 1 is the oversampling factor, and Among them, when O3=1, and the payload of the second indicator is bits.

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