Method and apparatus for CSI parameter configuration in a wireless communication system

Abstract

A method for operating a user equipment (UE) includes: receiving CSI feedback configuration information from a base station (BS), including codebook parameters jointly configured via a single radio resource control (RRC) parameter, the codebook parameters including codebook parameter 1, codebook parameter 2, codebook parameter 3 and codebook parameter 4, wherein codebook parameter 1 determines the number of spatial domain (SD) basis vectors, codebook parameter 4 determines the maximum number of coefficients, and codebook parameters 2 and 3 determine the number of frequency domain (FD) basis vectors, and wherein codebook parameter 2 is used for a first rank set and codebook parameter 3 is used for a second rank set; generating CSI feedback based on a single RRC parameter, wherein the CSI feedback is generated for a rank value from one of the first rank set and the second rank set; and sending the CSI feedback on an uplink channel.

Description

Technical Field

[0001] The present disclosure relates generally to wireless communication systems, and more particularly, to channel state information (CSI) parameter configuration in wireless communication systems. Background Art

[0002] Understanding and correctly estimating the channel between a user equipment (UE) and a base station (BS) (e.g., gNode B (gNB)) is important for fast and efficient wireless communication. In order to correctly estimate the downlink DL channel condition, the gNB may send a reference signal (e.g., CSI-RS) to the UE for DL ​​channel measurement, and the UE may report (e.g., feedback) information about the channel measurement (e.g., CSI) to the gNB. Through this DL channel measurement, the gNB is able to select appropriate communication parameters to quickly and efficiently perform wireless data communication with the UE. Summary of the invention

[0003] Solution to the problem

[0004] Embodiments of the present disclosure provide methods and apparatus for enabling channel state information (CSI) reporting in a wireless communication system.

[0005] In one embodiment, a UE for reporting CSI in a wireless communication system is provided. The UE includes: a transceiver configured to receive CSI feedback configuration information from a base station (BS), including codebook parameters jointly configured via a single radio resource control (RRC) parameter, wherein the codebook parameters include L, p, v o and β, where the parameter L determines the number of spatial domain (SD) basis vectors, the parameter β determines the maximum number of coefficients, and the parameters p and v o Determine the number of frequency domain (FD) basis vectors (M v ), where parameter p is used for the first rank set and parameter v o For the second rank set. The UE also includes a processor operably connected to the transceiver, the processor configured to generate CSI feedback based on the CSI feedback configuration information, wherein the CSI feedback is generated for a rank value v from one of the first rank set and the second rank set. The transceiver is also configured to send the CSI feedback on an uplink channel.

[0006] In another embodiment, a BS in a wireless communication system is provided. The BS includes a processor configured to generate CSI feedback configuration information. The BS also includes a transceiver operably connected to the processor. The transceiver is configured to send the CSI feedback configuration information to a user equipment (UE), wherein the CSI feedback configuration information includes codebook parameters jointly configured via a single radio resource control (RRC) parameter, wherein the codebook parameters include L, p, vo and β, where the parameter L determines the number of spatial domain (SD) basis vectors, the parameter β determines the maximum number of coefficients, and the parameters p and v o Determine the number of frequency domain (FD) basis vectors (M v ), where parameter p is used for the first rank set and parameter v o For the second rank set. The transceiver is also configured to receive, from the UE on an uplink channel, CSI feedback generated for a rank value v from one of the first rank set and the second rank set.

[0007] In yet another embodiment, a method for operating a UE is provided. The method includes: receiving CSI feedback configuration information from a base station (BS), including codebook parameters jointly configured via a single radio resource control (RRC) parameter, wherein the codebook parameters include L, p, v o and β, where the parameter L determines the number of spatial domain (SD) basis vectors, the parameter β determines the maximum number of coefficients, and the parameters p and v o Determine the number of frequency domain (FD) basis vectors (M v ), where parameter p is used for the first rank set and parameter v o for a second rank set; generating CSI feedback based on the CSI feedback configuration information, wherein the CSI feedback is generated for a rank value v from one of the first rank set and the second rank set; and sending the CSI feedback to the BS on an uplink channel.

[0008] Other technical features can be easily seen by those skilled in the art from the accompanying drawings, descriptions and claims.

[0009] Before proceeding to the following specific embodiments, it may be advantageous to set forth the definitions of specific words and phrases used throughout this patent document. The term "coupling" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not these elements are in physical contact with each other. The terms "send", "receive" and "communication" and their derivatives include direct communication and indirect communication. The terms "include" and "comprise" and their derivatives refer to including but not limited to. The term "or" is inclusive and refers to and / or. The phrase "associated with it" and its derivatives refer to including it, being included in it, interconnecting with it, including it, being contained in it, being connected to it or connected with it, being coupled to it or coupled with it, being able to communicate with it, cooperating with it, interlacing with it, being parallel with it, approaching it, binding it or binding with it, having it, having its properties, having a relationship to or with it, 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. The phrase "at least one of" when used with a list of items means that different combinations of one or more of the listed items 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 of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.

[0010] 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 is contained 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 an appropriate computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disk (CD), a digital video disk (DVD) or any other type of memory. "Non-transitory" computer-readable media 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 then rewrite, such as rewritable optical disks or erasable memory devices.

[0011] 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 and future uses of such defined words and phrases. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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:

[0013] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown;

[0014] Figure 2 An example gNB according to an embodiment of the present disclosure is shown;

[0015] Figure 3 An example UE according to an embodiment of the present disclosure is shown;

[0016] Figure 4A A high-level diagram showing an OFDMA transmission path according to an embodiment of the present disclosure;

[0017] Figure 4B A high level diagram showing an OFDMA receive path according to an embodiment of the present disclosure;

[0018] Figure 5 A transmitter block diagram for a PDSCH in a subframe according to an embodiment of the present disclosure is shown;

[0019] Figure 6 A receiver block diagram for PDSCH in a subframe according to an embodiment of the present disclosure is shown;

[0020] Figure 7 A transmitter block diagram for a PUSCH in a subframe according to an embodiment of the present disclosure is shown;

[0021] Figure 8 A receiver block diagram for PUSCH in a subframe according to an embodiment of the present disclosure is shown;

[0022] Fig. 9 shows an example network configuration according to an embodiment of the present disclosure;

[0023] Fig.10 shows an example multiplexing of two slices according to an embodiment of the present disclosure;

[0024] Fig.11 An example antenna block according to an embodiment of the present disclosure is shown;

[0025] Fig.12 The antenna port layout according to an embodiment of the present disclosure is shown;

[0026] Fig.13 A 3D grid showing an oversampled DTF beam according to an embodiment of the present disclosure;

[0027] Fig.14 A flowchart showing a method for operating a UE to perform CSI reporting in a wireless communication system that can be performed by a UE according to an embodiment of the present disclosure; and

[0028] Fig.15 A flow chart of a method for receiving CSI feedback that can be performed by a BS according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0029] Discussed below Figures 1 to 15 The various embodiments used to describe the principles of the present disclosure in this patent document are for illustration only and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will appreciate that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0030] The following documents and standard descriptions are hereby incorporated into the present disclosure by reference as if fully set forth herein: 3GPP TS 36.211 v16.1.0, "E-UTRA, Physical Channels and Modulation"; 3GPP TS 36.212 v16.1.0, "E-UTRA, Multiplexing and Channel Coding"; 3GPP TS 36.213 v16.1.0, "E-UTRA, Physical Layer Procedures"; 3GPP TS 36.321 v16.1.0, "E-UTRA, Medium Access Control (MAC) Protocol Specification"; 3GPP TS 36.331 v16.1.0, "E-UTRA, Radio Resource Control (RRC) Protocol Specification"; 3GPP TR 22.891 v14.2.0; 3GPP TS 38.211 v16.1.0, "E-UTRA, NR, Physical Channels and Modulation"; 3GPP TS 3GPP TS 38.213 v16.1.0, "E-UTRA, NR, Physical layer procedures for control"; 3GPP TS 38.214 v16.1.0, "E-UTRA, NR, Physical layer procedures for data"; and, 3GPP TS 38.212 v16.1.0, "E-UTRA, NR, Multiplexing and channel coding".

[0031] Various aspects, features and advantages of the present disclosure will be readily apparent from the following detailed description by simply illustrating several specific embodiments and implementations, including the best mode contemplated for carrying out the present disclosure. The present disclosure is capable of other and different embodiments, and its several details may be modified in various obvious respects, all without departing from the spirit and scope of the present disclosure. Therefore, the drawings and description should be regarded as illustrative rather than restrictive. The present disclosure is illustrated by way of example in the figures of the accompanying drawings, and not as a limitation.

[0032] In the following, for simplicity, both FDD and TDD are considered as duplexing methods for signaling of both downlink DL and uplink UL.

[0033] Although the exemplary description and embodiments that follow assume orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA), the present disclosure may be extended to other OFDM-based transmission waveforms or multiple access schemes, such as filtered OFDM (F-OFDM).

[0034] In order to meet the increased demand for wireless data traffic since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "super 4G networks" or "post-LTE systems."

[0035] 5G communication systems are considered to be implemented at higher frequency (mmWave) bands (e.g., 60 GHz bands) to achieve higher data rates, or at lower frequency bands (e.g., below 6 GHz) to enable robust coverage and mobility support. In order to reduce the propagation loss of radio waves and increase transmission coverage, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, massive antenna technology, etc. are discussed in 5G communication systems.

[0036] In addition, in the 5G communication system, development of system network improvements is underway based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul communication, mobile networks, collaborative communications, coordinated multi-point (CoMP) transmission and reception, interference mitigation and elimination, etc.

[0037] In 5G systems, hybrid frequency shift keying and quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC) as adaptive modulation and coding (AMC) techniques, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0038] The following Figures 1 to 4BVarious embodiments are described that are implemented using Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication techniques in a wireless communication system. Figures 1 to 3 The description does not imply physical or architectural limitations on the implementation of different embodiments. Different embodiments of the present disclosure may be implemented in any appropriately arranged communication system. The present disclosure encompasses multiple components that may be used in conjunction or combination with each other or may be operated as independent solutions.

[0039] 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.

[0040] like Figure 1 As shown, the wireless network includes gNB 101, 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.

[0041] For a first plurality of user equipment (UE) within a coverage area 120 of gNB 102, gNB 102 provides wireless broadband access to a network 130. The first plurality of UEs include: UE 111, which may be located in a small enterprise; UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R); UE 115, which may be located in a second residence (R); and UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop, a wireless PDA, etc. For a second plurality of UEs within a coverage area 125 of gNB 103, gNB 103 provides wireless broadband access to a network 130. The second plurality of UEs include UE 115 and UE 116. In some embodiments, one or more of gNBs 101 to 103 may communicate with each other and with UEs 111 to 116 using 5G, LTE, LTE-A, WiMAX, WiFi, or other wireless communication technologies.

[0042] Depending on the network type, the term "base station" or "BS" may refer to any component (or set 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 base station (gNB), a macro cell, a femto cell, a WiFi access point (AP), or other wireless-enabled devices. The base station may provide wireless access according to one or more wireless communication protocols, such as 5G 3GPP New Radio Interface / Access (NR), Long Term Evolution (LTE), LTE Advanced (LTE-A), High Speed ​​Packet Access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. 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 device". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to remote wireless equipment that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or is generally considered a fixed device (such as a desktop computer or a vending machine).

[0043] The dashed lines represent the approximate extents of coverage area 120 and coverage area 125, which are shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with a gNB, such as coverage area 120 and coverage area 125, may have other shapes, including irregular shapes, depending on the configuration of the gNB and changes in the radio environment associated with natural and man-made obstacles.

[0044] As described in more detail below, one or more of UE 111 to UE 116 include circuits, procedures, or a combination thereof for receiving codebook parameters for CSI feedback in a wireless communication system. In a specific embodiment, one or more of gNB 101 to gNB 103 include circuits, procedures, or a combination thereof for sending codebook parameters for CSI feedback in a wireless communication system.

[0045] 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 of gNB 102 and gNB 103 may communicate directly with network 130 and provide direct wireless broadband access to network 130 to the UEs. In addition, gNB 101, gNB 102, and / or gNB 103 may provide access to other or additional external networks, such as an external telephone network or other type of data network.

[0046] 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 gNB 101 and gNB 103 may have the same or similar configuration. 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.

[0047] like Figure 2 As shown, gNB 102 includes multiple antennas 205a to 205n, multiple RF transceivers 210a to 210n, transmit (TX) processing circuitry 215, and receive (RX) processing circuitry 220. gNB 102 also includes a controller / processor 225, a memory 230, and a backhaul or network interface 235.

[0048] The RF transceivers 210a to 210n receive incoming RF signals from the antennas 205a to 205n, such as signals transmitted by UEs in the network 100. The RF transceivers 210a to 210n down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to the RX processing circuit 220, which generates processed baseband signals by filtering, decoding and / or digitizing the baseband or IF signals. The RX processing circuit 220 sends the processed baseband signals to the controller / processor 225 for further processing.

[0049] The TX processing circuit 215 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 225. The TX processing circuit 215 encodes, multiplexes, and / or digitizes the output baseband data to generate a processed baseband or IF signal. The RF transceivers 210a to 210n receive the output processed baseband or IF signals from the TX processing circuit 215 and up-convert the baseband or IF signals into RF signals that are transmitted via the antennas 205a to 205n.

[0050] 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 RF transceivers 210a to 210n, the RX processing circuit 220, and the TX processing circuit 215 to receive forward channel signals and transmit reverse channel signals in accordance with known principles. The controller / processor 225 may also support additional functions, such as more advanced wireless communication functions.

[0051] For example, the controller / processor 225 may support beamforming or directional routing operations, in which signals output from the multiple antennas 205a to 205n are weighted differently to effectively steer the output signals in a desired direction. In the gNB 102, any of a variety of other functions may be supported by the controller / processor 225.

[0052] Controller / processor 225 is also capable of executing programs and other processes, such as an OS, that reside in memory 230. Controller / processor 225 may move data into or out of memory 230 as required by the executing process.

[0053] 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 over a backhaul connection or over a network. The interface 235 may support communication over any appropriate wired or wireless connection. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a system supporting 5G, LTE, or LTE-A), the interface 235 may allow the gNB 102 to communicate with other gNBs over a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 235 may allow the gNB 102 to communicate over a wired or wireless local area network or over a wired or wireless connection to a larger network (such as the Internet). The interface 235 includes any appropriate structure that supports communication over a wired or wireless connection, such as an Ethernet or RF transceiver.

[0054] Memory 230 is coupled to controller / processor 225. A portion of memory 230 may include RAM, and another portion of memory 230 may include flash memory or other ROM.

[0055] although Figure 2 An example of gNB 102 is shown, but the Figure 2 For example, gNB 102 may include any number of Figure 2 As a specific example, the access point may include several interfaces 235, and the controller / processor 225 may support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of TX processing circuitry 215 and a single instance of RX processing circuitry 220, the gNB 102 may include multiple instances of each (such as one instance per RF transceiver). In addition, Figure 2 The various components in the can be combined, further subdivided, or omitted, and additional components can be added according to specific needs.

[0056] Figure 3 An example UE 116 is shown according to an embodiment of the present disclosure. Figure 3 The embodiment of UE 116 shown is for illustration only, and Figure 1 UE 111 to UE 115 may have the same or similar configuration. However, UEs have various configurations, and Figure 3 The scope of the present disclosure is not limited to any particular implementation of a UE.

[0057] Figure 3 An example UE 116 is shown according to an embodiment of the present disclosure. Figure 3 The embodiment of UE 116 shown is for illustration only, and Figure 1 UE 111 to UE 115 may have the same or similar configuration. However, UEs have various configurations, and Figure 3 The scope of the present disclosure is not limited to any particular implementation of a UE.

[0058] RF transceiver 310 receives an incoming RF signal from antenna 305 transmitted by a gNB of network 100. RF transceiver 310 downconverts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 325 sends the processed baseband signal to speaker 330 (such as for voice data) or to processor 340 for further processing (such as for web browsing data).

[0059] The TX processing circuit 315 receives analog or digital voice data from the microphone 320, or receives other output baseband data (such as network data, email, or interactive video game data) from the processor 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the output baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the output processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 305.

[0060] 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 RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 to receive forward channel signals and send reverse channel signals. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.

[0061] The processor 340 is also capable of executing other processes and programs resident in the memory 360, such as processes for CSI feedback on uplink channels. 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.

[0062] Processor 340 is also coupled to touch screen 350 and display 355. An operator of UE 116 may input data into UE 116 using touch screen 350. Display 355 may be a liquid crystal display, light emitting diode display, or other display capable of presenting text (such as from a website) and / or at least limited graphics.

[0063] Memory 360 is coupled to processor 340. A portion of memory 360 may include random access memory (RAM), and another portion of memory 360 may include flash memory or other read-only memory (ROM).

[0064] Although Figure 3 An example of UE 116 is shown, but the Figure 3 Make various changes. For example, Figure 3The various components in the embodiment 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 addition, although Figure 3 The UE 116 is shown configured as a mobile phone or smartphone, but the UE may be configured to operate as other types of mobile or stationary devices.

[0065] Figure 4A is a high-level diagram of a transmit path circuit. For example, the transmit path circuit may be used for orthogonal frequency division multiple access (OFDMA) communications. Figure 4B is a high-level diagram of a receive path circuit. For example, the receive path circuit can be used for orthogonal frequency division multiple access (OFDMA) communications. Figure 4A and Figure 4B In the embodiment, for downlink communication, the transmit path circuit may be implemented in a base station (gNB) 102 or a relay station, and the receive path circuit may be implemented in a user equipment (e.g., Figure 1 In other examples, for uplink communications, the receive path circuit 450 may be implemented in a base station (e.g., Figure 1 The transmission path circuit may be implemented in a user equipment (e.g., a gNB 102) or a relay station, and the transmission path circuit may be implemented in a user equipment (e.g., Figure 1 is implemented in the user device 116).

[0066] The transmit path circuitry includes a channel coding and modulation block 405, a serial to parallel (S to P) block 410, an inverse fast Fourier transform (IFFT) block of size N 415, a parallel to serial (P to S) block 420, an add cyclic prefix block 425, and an upconverter (UC) 430. The receive path circuitry 450 includes a downconverter (DC) 455, a remove cyclic prefix block 460, a serial to parallel (S to P) block 465, a fast Fourier transform (FFT) block of size N 470, a parallel to serial (P to S) block 475, and a channel decoding and demodulation block 480.

[0067] Figure 4A 400 and Figure 4B At least some components in 450 may be implemented in software, while other components may be implemented in configurable hardware or a mixture of software and configurable hardware. Specifically, it should be noted that the FFT block and IFFT block described in this disclosure document may be implemented as a configurable software algorithm, wherein the value of size N may be modified according to the implementation.

[0068] In addition, although the present disclosure relates to embodiments that implement fast Fourier transform and inverse fast Fourier transform, this is only illustrative and cannot be interpreted as limiting the scope of the present disclosure. It is understood that in alternative embodiments of the present disclosure, the fast Fourier transform function and the inverse fast Fourier transform function can be easily replaced by discrete Fourier transform (DFT) function and inverse discrete Fourier transform (IDFT) function, respectively. It is understood that for DFT function and IDFT function, the value of N variable can be any integer (i.e., 1, 4, 3, 4, etc.), and for FFT function and IFFT function, the value of N variable can be any integer of power of 2 (i.e., 1, 2, 4, 8, 16, etc.).

[0069] In the transmit path circuit 400, the channel coding and modulation block 405 receives a set of information bits, applies coding (e.g., LDPC coding), and modulates (e.g., quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) the input bits to produce a sequence of frequency domain modulation symbols. The serial to parallel block 410 converts (i.e., demultiplexes) the serial modulation symbols into parallel data to produce N parallel symbol streams, where N is the IFFT / FFT size used in the BS 102 and the UE 116. The size-N IFFT block 415 then performs an IFFT operation on the N parallel symbol streams to produce a time domain output signal. The parallel to serial block 420 converts (i.e., multiplexes) the parallel time domain output symbols from the size-N IFFT block 415 to produce a serial time domain signal. The add cyclic prefix block 425 then inserts a cyclic prefix into the time domain signal. Finally, upconverter 430 modulates (ie, upconverts) the output of add cyclic prefix block 425 to an RF frequency for transmission via a wireless channel. The signal may also be filtered at baseband before conversion to RF frequency.

[0070] The transmitted RF signal arrives at UE 116 after passing through the wireless channel, and the reverse operation of that at gNB 102 is performed. Downconverter 455 downconverts the received signal to baseband frequency, and remove cyclic prefix block 460 removes the cyclic prefix to produce a serial time-domain baseband signal. Serial to parallel block 465 converts the time-domain baseband signal into parallel time-domain signals. Then, FFT block 470 of size N performs an FFT algorithm to produce N parallel frequency-domain signals. Parallel to serial block 475 converts the parallel frequency-domain signals into a sequence of modulated data symbols. Channel decoding and demodulation block 480 demodulates and then decodes the modulation symbols to recover the original input data stream.

[0071] Each of gNB 101 to gNB 103 may implement a transmission path similar to that for transmitting in the downlink to user equipment 111 to user equipment 116, and may implement a reception path similar to that for receiving in the uplink from user equipment 111 to user equipment 116. Similarly, each of user equipment 111 to user equipment 116 may implement a transmission path corresponding to the architecture for transmitting in the uplink to gNB 101 to gNB 103, and may implement a reception path corresponding to the architecture for receiving in the downlink from gNB 101 to gNB 103.

[0072] Use cases for 5G communication systems have been identified and described. These use cases can be roughly divided into three different groups. In one example, enhanced mobile broadband (eMBB) is determined to be used for high bit / second requirements and less stringent latency and reliability requirements. In another example, ultra-reliable and low latency (URLL) is determined to be used for less stringent bit / second requirements. In yet another example, massive machine type communication (mMTC) is determined to be up to 100,000 to 1 million devices per square kilometer, but the reliability / throughput / latency requirements may be less stringent. In addition, this situation may also involve power efficiency requirements, because battery consumption can be minimized as much as possible.

[0073] The communication system includes a downlink (DL) and an uplink (UL), wherein the downlink (DL) carries signals from a transmission point (such as a base station (BS) or NodeB) to a user equipment (UE), and the uplink (UL) carries signals from a UE to a reception point (such as a NodeB). A UE (often referred to as a terminal or mobile station) can be fixed or mobile and can be a cellular phone, a personal computer device, or an automation device. An eNodeB (often a fixed station) can also be referred to as an access point or other equivalent terms. For an LTE system, a NodeB is generally referred to as an eNodeB.

[0074] In a communication system (such as an LTE system), a DL signal may include a data signal conveying information content, a control signal conveying DL control information (DCI), and a reference signal (RS) (also called a pilot signal). The eNodeB sends data information via a physical DL shared channel (PDSCH). The eNodeB sends DCI via a physical DL control channel (PDCCH) or an enhanced PDCCH (EPDCCH).

[0075] The eNodeB sends confirmation information in the Physical Hybrid ARQ Indicator Channel (PHICH) in response to sending a data transport block (TB) from the UE. The eNodeB sends one or more of multiple types of RS, including UE common RS (CRS), channel state information RS (CSI-RS), or demodulation RS (DMRS). CRS is sent on the DL system bandwidth (BW) and can be used by the UE to obtain channel estimates to demodulate data or control information or perform measurements. In order to reduce CRS overhead, the eNodeB may send CSI-RS in the time domain and / or frequency domain with a density less than that of CRS. DMRS may be sent only in the BW of the corresponding PDSCH or EPDCCH, and the UE may use DMRS to demodulate data or control information in the PDSCH or EPDCCH, respectively. The transmission time interval for a DL channel is called a subframe and may have a duration of, for example, 1 millisecond.

[0076] The DL signal also includes a logical channel for transmitting system control information. When the DL signal conveys a master information block (MIB), the BCCH is mapped to a transport channel called a broadcast channel (BCH), or when the DL signal conveys a system information block (SIB), the BCCH is mapped to a DL shared channel (DL-SCH). Most system information is included in different SIBs transmitted using DL-SCH. The presence of system information located on the DL-SCH in a subframe can be indicated by the transmission of a corresponding PDCCH, which conveys a codeword with a cyclic redundancy check (CRC) scrambled with a system information RNTI (SI-RNTI). Alternatively, scheduling information for SIB transmission can be provided in an earlier SIB, and scheduling information for the first SIB (SIB-1) can be provided by the MIB.

[0077] DL resource allocation is performed in units of subframes and groups of physical resource blocks (PRBs). The transmission BW consists of frequency resource units called resource blocks (RBs). Each RB consists of subcarriers or resource elements (REs), such as 12 REs. A unit of one RB in one subframe is called a PRB. A UE can be allocated M PDSCH RB, that is, a total of REs used for PDSCH transmission BW.

[0078] The UL signal may include a data signal conveying data information, a control signal conveying UL control information (UCI), and a UL RS. The UL RS includes a DMRS and a sounding RS (SRS). The UE sends the DMRS only in the BW of the corresponding PUSCH or PUCCH. The eNodeB may use the DMRS to demodulate the data signal or the UCI signal. The UE sends the SRS to provide the eNodeB with UL CSI. The UE sends data information or UCI via the corresponding physical UL shared channel (PUSCH) or the physical UL control channel (PUCCH). If the UE needs to send data information and UCI in the same UL subframe, the UE may multiplex both in the PUSCH. The UCI includes a hybrid automatic repeat request confirmation (HARQ-ACK) information indicating a correct (ACK) or incorrect (NACK) detection of a data TB in the PDSCH or the absence of a PDCCH detection (DTX), a scheduling request (SR) indicating whether the UE has data in the UE's buffer, a rank indicator (RI), and a channel state information (CSI) that enables the eNodeB to perform link adaptation for PDSCH transmission to the UE. HARQ-ACK information is also sent by the UE in response to detecting a PDCCH / EPDCCH indicating the release of a semi-persistently scheduled PDSCH.

[0079] The UL subframe consists of two time slots. Each time slot consists of symbols are used to send data information, UCI, DMRS or SRS. The frequency resource unit of the UL system BW is RB. The UE is allocated N RB RB, that is, a total of REs used to transmit BW. For PUCCH, N RB = 1. The last subframe symbol can be used to multiplex SRS transmissions from one or more UEs. The number of subframe symbols available for data / UCI / DMRS transmission is If the last subframe symbol is used to send SRS, then N SRS =1, otherwise N SRS =O.

[0080] Figure 5 A transmitter block diagram 500 for PDSCH in a subframe according to an embodiment of the present disclosure is shown. Figure 5 The illustrated embodiment of transmitter block diagram 500 is for illustration only. Figure 5 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Figure 5 The scope of the present disclosure is not limited to any particular implementation of transmitter block diagram 500 .

[0081] like Figure 5 As shown, information bits 510 are encoded by encoder 520 (such as a Turbo encoder) and modulated by modulator 530 (e.g., using quadrature phase shift keying (QPSK)). A serial-to-parallel (S / P) converter 540 generates M modulation symbols, which are then provided to a mapper 550 to map to REs selected by a transmission BW selection unit 555 for the allocated PDSCH transmission BW; unit 560 applies an inverse fast Fourier transform (IFFT); the output is then serialized by a parallel-to-serial (P / S) converter 570 to create a time domain signal; filtering is applied by a filter 580; and the signal is transmitted 590. Additional functions (such as data scrambling, cyclic prefix insertion, time windowing, interleaving) are well known in the art and are not shown for brevity.

[0082] Figure 6 A receiver block diagram 600 for PDSCH in a subframe according to an embodiment of the disclosure is shown. Figure 6 The illustrated embodiment of (block) diagram 600 is for illustration only. Figure 6 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Figure 6 The scope of the present disclosure is not limited to any particular implementation of block diagram 600 .

[0083] like Figure 6 As shown, a received signal 610 is filtered by a filter 620, an RE 630 for the allocated receive BW is selected by a BW selector 635, a fast Fourier transform (FFT) is applied by a unit 640, and the output is serialized by a parallel-to-serial converter 650. Subsequently, a demodulator 660 coherently demodulates the data symbols by applying a channel estimate obtained from a DMRS or CRS (not shown), and a decoder 670 (such as a Turbo decoder) decodes the demodulated data to provide estimates of information data bits 680. Additional functions such as time windowing, cyclic prefix removal, descrambling, channel estimation, and deinterleaving are not shown for brevity.

[0084] Figure 7 A transmitter block diagram 700 for PUSCH in a subframe according to an embodiment of the present disclosure is shown. Figure 7 The illustrated embodiment of block diagram 700 is for illustration only. Figure 7 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Figure 7The scope of the present disclosure is not limited to any particular implementation of block diagram 700 .

[0085] like Figure 7 As shown, information data bits 710 are encoded by an encoder 720 (such as a Turbo encoder) and modulated by a modulator 730. A discrete Fourier transform (DFT) unit 740 applies DFT to the modulated data bits, a transmission BW selection unit 755 selects REs 750 corresponding to the allocated PUSCH transmission BW, a unit 760 applies IFFT, and after cyclic prefix insertion (not shown), filtering is applied by a filter 770, and the signal is transmitted 780.

[0086] Figure 8 A receiver block diagram 800 is shown for PUSCH in a subframe according to an embodiment of the disclosure. Figure 8 The illustrated embodiment of block diagram 800 is for illustration only. Figure 8 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Figure 8 The scope of the present disclosure is not limited to any particular implementation of block diagram 800 .

[0087] like Figure 8 As shown, the received signal 810 is filtered by a filter 820. Subsequently, after cyclic prefix removal (not shown), a unit 830 applies FFT, a receive BW selector 845 selects REs 840 corresponding to the allocated PUSCH receive BW, a unit 850 applies an inverse DFT (IDFT), a demodulator 860 coherently demodulates the data symbols by applying a channel estimate obtained from a DMRS (not shown), and a decoder 870 (such as a Turbo decoder) decodes the demodulated data to provide an estimate of the information data bit 880.

[0088] In the next generation of cellular systems, in addition to the capabilities of the LTE system, various use cases are envisioned. Systems capable of operating below 6 GHz and above 6 GHz (e.g., in the mmWave regime) (called 5G or fifth generation cellular systems) become one of the requirements. In 3GPP TR 22.891, 74 5G use cases have been identified and described; these use cases can be roughly divided into three different groups. The first group is called "enhanced mobile broadband (eMBB)", which targets high data rate services with lower latency and reliability requirements. The second group is called "ultra-reliable and low latency (URLL)", which targets applications with less stringent data rate requirements but lower tolerance for latency. The third group is called "massive MTC (mMTC)", which targets a large number (such as 1 million per square kilometer) of low-power device connections with less stringent reliability, data rate and latency requirements.

[0089] Fig. 9 An example network configuration 900 is shown according to an embodiment of the present disclosure. Fig. 9 The illustrated embodiment of network configuration 900 is for illustration only. Fig. 9 The scope of the present disclosure is not limited to any particular implementation of configuration 900 .

[0090] In order to enable 5G networks to support these different services with different qualities of service (QoS), a scheme called network slicing has been identified in the 3GPP specifications.

[0091] like Fig. 9 As shown, the operator's network 910 includes several radio access networks 920 (RAN) associated with network equipment such as gNB 930a and gNB 930b, small cell base stations (femto / pico gNB or Wi-Fi access points) 935a and small cell base stations 935b. The network 910 can support various services, each represented as a slice.

[0092] In the example, URLL slice 940a serves UEs that need URLL services, such as cars 945b, trucks 945c, smart watches 945a, and smart glasses 945d. Two mMTC slices 950a and 950b serve UEs that need mMTC services, such as power meters 955a and temperature control boxes 955b. One eMBB slice 960a serves UEs that need eMBB services, such as cellular phones 965a, laptops 965b, and tablets 965c. In addition, it is conceivable that a device with two slices is configured.

[0093] In order to efficiently utilize PHY resources and multiplex various slices in DL-SCH (with different resource allocation schemes, numerologies, and scheduling strategies), a flexible and self-contained frame or subframe design is utilized.

[0094] Fig.10 An example multiplexing of two slices 1000 according to an embodiment of the present disclosure is shown. Fig.10 The illustrated embodiment of multiplexing of two slices 1000 is for illustration only. Fig.10 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Fig.10 The scope of the present disclosure is not limited to any particular implementation of the multiplexing of two slices 1000 .

[0095] Fig.10 Two exemplary embodiments of multiplexing two slices within a common subframe or frame are depicted. In these exemplary embodiments, a slice may consist of one or two transmission instances, where one transmission instance includes a control (CTRL) component (e.g., 1020a, 1060a, 1060b, 1020b, or 1060c) and a data component (e.g., 1030a, 1070a, 1070b, 1030b, or 1070c). In embodiment 1010, the two slices are multiplexed in the frequency domain, while in embodiment 1050, the two slices are multiplexed in the time domain.

[0096] 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.

[0097] Fig.11 An example antenna block 1100 is shown according to an embodiment of the disclosure. Fig.11 The illustrated embodiment of antenna block 1100 is for illustration only. Fig.11 The scope of the present disclosure is not limited to any particular implementation of antenna block 1100 .

[0098] For mmWave bands, although the number of antenna elements may be larger for a given form factor, the number of CSI-RS ports (which may correspond to the number of digital precoding ports) is often limited by hardware constraints (such as the feasibility of installing a large number of ADCs / DACs at mmWave frequencies), such as Fig.11As shown. In this case, one CSI-RS port is mapped to a large number of antenna elements that can be controlled by a set of analog phase shifters. Then, one CSI-RS port can correspond to a subarray that is subjected to analog beamforming to produce a narrow analog beam. The analog beam can be configured to scan a larger range of angles by varying the phase shifter set over (multiple) symbols or subframes. The number of subarrays (equal to the number of RF chains) is proportional to the number of CSI-RS ports N. CSI-PORT The digital beamforming unit is in N CSI-PORT A linear combination is performed between the analog beams to further increase the precoding gain. While the analog beams are broadband (and therefore not frequency selective), the digital precoding can vary between sub-bands of frequency or resource blocks.

[0099] To achieve digital precoding, effective CSI-RS design is a key factor. To this end, three types of CSI reporting mechanisms corresponding to three types of CSI-RS measurement behaviors are supported, such as "Class A" CSI reporting corresponding to non-precoded CSI-RS, "Class B" reporting with K=1 CSI-RS resources corresponding to UE-specific beamforming CSI-RS, and "Class C" reporting with K>1 CSI-RS resources corresponding to cell-specific beamforming CSI-RS.

[0100] For non-precoded (NP) CSI-RS, a cell-specific one-to-one mapping between CSI-RS ports and TXRUs is utilized. Different CSI-RS ports have the same wide beamwidth and direction, and thus generally cover the entire cell. For beamformed CSI-RS, cell-specific or UE-specific beamforming operations are applied to non-zero power (NZP) CSI-RS resources (e.g., including multiple ports). At least at a given time / frequency, the CSI-RS ports have narrow beamwidths and thus do not cover the entire cell, at least from the perspective of the gNB. At least some CSI-RS port-resource combinations have different beam directions.

[0101] In cases where the DL long-term channel statistics can be measured via the UL signal at the serving eNodeB, UE-specific BF CSI-RS can be easily used. This is usually feasible when the UL-DL duplex distance is small enough. However, when this condition does not hold, the eNodeB needs some UE feedback to obtain an estimate of the DL long-term channel statistics (or any representation thereof). To facilitate this process, a first BF CSI-RS is sent with a period T1 (ms) and a second NP CSI-RS is sent with a period T2 (ms), where T1≤T2. This approach is called hybrid CSI-RS. The implementation of hybrid CSI-RS depends largely on the definition of the CSI process and the NZP CSI-RS resources.

[0102] In the 3GPP LTE specifications, MIMO has been identified as an essential feature for achieving high system throughput requirements, and this will continue to be the case in NR. One of the key components of the MIMO transmission scheme is accurate CSI acquisition at the eNB (or TRP). For MU-MIMO, in particular, the availability of accurate CSI is necessary in order to ensure high MU performance. For TDD systems, CSI can be acquired using SRS transmissions that rely on channel reciprocity. On the other hand, for FDD systems, CSI can be acquired using CSI-RS transmissions from the eNB and CSI acquisition and feedback from the UE. In traditional FDD systems, the CSI feedback framework is "implicit" in the form of CQI / PMI / RI derived from the codebook, where it is assumed that SU transmissions come from the eNB. Because of the inherent SU assumption when deriving CSI, this implicit CSI feedback is not sufficient for MU transmissions. Since future (e.g., NR) systems are likely to be more MU-centric, this SU-MU CSI mismatch will become a bottleneck for achieving high MU performance gains. Another issue with implicit feedback is about the scalability of more antenna ports at the eNB. For a large number of antenna ports, the codebook design for implicit feedback is quite complex, and in actual deployment scenarios, there is no guarantee that the designed codebook can bring reasonable performance advantages (eg, can only show a small percentage gain at best).

[0103] In 5G or NR systems, the above CSI reporting paradigm from LTE is also supported and is referred to as Type I CSI reporting. In addition to Type I, high-resolution CSI reporting (referred to as Type II CSI reporting) is also supported to provide more accurate CSI information to the gNB for use cases such as high-order MU-MIMO.

[0104] Fig.12 An example antenna port layout 1200 is shown according to an embodiment of the disclosure. Fig.12The illustrated embodiment of antenna port layout 1200 is for illustration only. Fig.12 The scope of the present disclosure is not limited to any particular implementation of the antenna port layout 1200 .

[0105] like Fig.12 As shown, N 1 and N 2 is 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, and for 1D antenna port layout, N 1 >1, and N 2 = 1. Therefore, for the dual-polarization antenna port layout, the total number of antenna ports is 2N 1 N 2 .

[0106] As described in U.S. Patent No. 10,659,118, entitled “Method and Apparatus for Explicit CSI Reporting in Advanced Wireless Communication Systems,” issued on May 19, 2020, which is incorporated herein by reference in its entirety, a high-resolution (e.g., Type II) CSI report is configured to a UE, wherein a linear combination-based Type II CSI reporting framework is extended to include a frequency dimension in addition to a first antenna port dimension and a second antenna port dimension.

[0107] Fig.13 A 3D grid 1300 (first port dimension, second port dimension, frequency dimension) of an oversampled DFT beam is shown, where:

[0108] The first dimension is associated with the first port dimension,

[0109] The second dimension is associated with the second port dimension, and

[0110] The third dimension is associated with the frequency dimension.

[0111] The basis sets for the first port domain representation and the second port domain representation are respectively of length N. 1 and length N 2 The oversampled DFT codebook has an oversampling factor of O. 1 and the oversampling factor O 2 Similarly, the basis set for the frequency domain representation (i.e., the third dimension) is of length N 3 The oversampled DFT codebook with an oversampling factor O 3 In one example, O 1 =O 2 =O 3 =4. In another example, the oversampling factor Oi 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).

[0112] The UE is configured with a higher layer parameter CodebookType set to 'TypeII-Compression' or 'TypeIII' for enhanced Type II CSI 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 any of the following:

[0113]

[0114]

[0115] or

[0116]

[0117] in,

[0118] N 1 is the number of antenna ports in the first antenna port dimension,

[0119] N 2 is the number of antenna ports in the second antenna port dimension,

[0120] N 3 is the number of SBs or frequency domain (FD) units / components (including the CSI reporting band) used for PMI reporting, which may be different from (e.g., smaller than) the number of SBs used for CQI reporting,

[0121] a i It is 2N 1 N 2 ×1 (Equation 1) or N 1 N 2 ×1 (Equation 2) column vector,

[0122] b m YesN 3 ×1 column vector,

[0123] c l，i，m is the complexity coefficient.

[0124] In a variant, when subset K < 2LM coefficients (where K is fixed, configured by the gNB, or reported by the UE), the coefficient c in the precoder equation (Equation 1 or Equation 2) is l，i，m Replace with vl，i，m ×c l，i，m ,in,

[0125] If the coefficient c l，i，m is non-zero, then v l，i，m =1, and is therefore reported by the UE according to some embodiments of the present invention.

[0126] Otherwise, v l，i，m =0 (i.e., c l，i，m is zero and therefore not reported by the UE).

[0127] According to some embodiments of the present disclosure, indicating v l，i，m =1 or 0.

[0128] In a variant, the precoder equation (Equation 1 or Equation 2) is summarized as:

[0129]

[0130] as well as

[0131]

[0132] where for a given i, the number of basis vectors is M i , and the corresponding basis vector is {b i，m}. It should be noted that M i is the coefficient c reported by the UE for a given i l，i，m The number of i ≤M(where {M i} or ∑M i is fixed, configured by the gNB or reported by the UE).

[0133] W l The columns 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.

[0134] L≤2N 1 N 2 , and K≤N 3 If L = 2N 1 N 2 , then A is the identity matrix and therefore will not be reported. Similarly, if K = N 3 , then B is the identity matrix and will not be reported. Assume L < 2N 1 N 2, in this example, to report column A, an oversampled DFT codebook is used. For example, a i =v l，m , where the quantity v l，m Given by:

[0135]

[0136]

[0137] Similarly, assuming K < N 3 In this example, to report column B, an oversampled DFT codebook is used. For example, b k =w k , where the quantity w k Given by:

[0138]

[0139] In another example, a discrete cosine transform DCT basis is used to construct / report a basis B for the third dimension. The mth column of the DCT compression matrix is ​​simply given by:

[0140]

[0141] [1] Since the DCT is applied to real-valued coefficients, the DCT is applied to the real and imaginary parts (of the channel or channel eigenvector) respectively. Alternatively, the DCT is applied to the amplitude component and phase component (of the channel or channel eigenvector) respectively. The use of DFT or DCT basis is for illustrative purposes only. The present disclosure is applicable to any other basis vectors for constructing / reporting A and B.

[0142] Furthermore, in an alternative scheme, for reciprocity-based Type II CSI reporting, the UE is configured with a higher layer parameter CodebookType set to “TypeII-PortSelection-Compression” or “TypeIII-PortSelection” for enhanced Type II CSI reporting with port selection, where the precoder for all SBs and for a given layer l=1, .., v (where v is the associated RI value) is determined by W l =AC l B H Given, where N 1 、N 2 、N 3 and c l，i，k Defined as above, except that the matrix A includes the port selection vectors. For example, the L antenna ports for each polarization or the column vector of A is indexed by q 1 Select, among them, (This requires bits), and configures the higher layer parameter PortSelectionSamplingSize to the value of d, where d∈{1,2,3,4}, and To report the columns of A, use the port selection vector, e.g., a i =v m , where the quantity v m is the element (m mod P CSI-RS / 2) contains the value 1 and zeros elsewhere CSI-RS / 2-element column vector (where the first element is element 0).

[0143] At a high level, the precoder W l It can be described as follows,

[0144]

[0145] Where A = W 1 Corresponding to W in Type II CSI codebook 1 ,Right now, and The matrix consists of all the desired linear combination coefficients (e.g., amplitude and phase or real or imaginary part). Each reported coefficient (c l，i，m =p l，i，m φ l，i，m ) is quantized as the amplitude coefficient (p l，i，m ) and phase coefficient (φ l，i，m ).

[0146] In one example, an A-bit amplitude codebook is used to report the amplitude coefficient (p i，i，m ), where A belongs to {2, 3, 4}. If multiple values ​​for A are supported, one value is configured via higher layer signaling. In another example, the amplitude coefficient (p l，i，m ) is reported as in:

[0147] · is the reference or first amplitude reported using the A1 bit amplitude codebook, where A1 belongs to {2, 3, 4}, and

[0148] · is the differential or second amplitude reported using the A2-bit amplitude codebook, where A2≤A1 belongs to {2, 3, 4}.

[0149] For layer l, let us associate the spatial domain (SD) basis vectors (or beams) i∈{0, 1, ..., 2L l-1} and frequency domain (FD) basis vectors (or beams) m∈{0, 1, ..., M l -1} The linear combination (LC) coefficient associated with l，i，m , and the strongest coefficient is expressed as Here, (L l , M l ) represents the number of SD basis vectors and FD basis vectors used for layer l. In one example, L l = L. When the length in use is 2L l M l A bitmap to report K NZ，l The strongest coefficients are reported among the non-zero (NZ) coefficients, where And β l is a higher layer configuration. In one example, for rank 1 and rank 2, β l =β. In one example, for β with rank > 2, l is fixed (based on β for rank 1 and rank 2) or higher layer configured. Assume the remaining 2L not reported by the UE l M l -K NZ，l The coefficient is zero.

[0150] In one example, the following quantization scheme is used to quantize / report K for each layer l Nz，i NZ coefficient.

[0151] UE reports are used to The following content of the quantized NZ coefficient is:

[0152] ο for the strongest coefficient index (i * , m * ) l The strongest coefficient indicator (SCL) l )

[0153] * Strongest coefficient (hence its amplitude / phase is not reported)

[0154] οTwo reference amplitudes specific to the antenna polarization:

[0155] *For the strongest coefficient The associated polarization, due to the reference amplitude Therefore it will not be reported.

[0156] *For the other polarization, refer to the amplitude Quantized to 4 bits

[0157] · The 4-bit amplitude alphabet is reserve"}.

[0158] For {c l，i，m , (i, m)≠(i * , m * )}:

[0159] * For each polarization, the differential amplitude of the coefficient is calculated based on the reference amplitude specific to the associated polarization And quantize it to 3 bits.

[0160] · The 3-digit amplitude alphabet is

[0161] Note: The final quantized amplitude P l，i，m Depend on Given.

[0162] * Quantize each phase to 8PSK (N ph =8) or 16PSK (N ph =16) (this is configurable).

[0163] The UE may be configured to report M FD basis vectors. In one example, Where R is the higher layer configuration according to {1, 2}, and p is the higher layer configuration according to In one example, the p-value is configured by higher layers for rank 1 and rank 2 CSI reporting. For rank > 2 (e.g., rank 3 and rank 4), the p-value (given by v 0 In one example, for ranks 1 to 4, (p, v o ) is based on Joint configuration, that is, for rank 1 and rank 2, And for rank 3 and rank 4,

[0164] The UE may be configured to report, for each layer l∈{0, 1, ..., v-1} of the CSI report of rank v, 3 The orthogonal DFT basis vectors are derived from freely (independently) reporting M FD basis vectors in one step. Alternatively, the UE can be configured to report M FD basis vectors in two steps, as follows:

[0165] In step 1, select / report including N' 3 <N 3 An intermediate set (InS) of basis vectors, where InS is common to all layers.

[0166] In step 2, for each layer l∈{0, 1, ..., v-1} of the CSI report of rank v, from N′ in InS 3 basis vectors freely (independently) select / report M FD basis vectors.

[0167] In one example, when N 3 ≤19, use the one-step method, and when N 3 >19, use the two-step method. In one example, Among them, α>1 is configurable.

[0168] The codebook parameters used in DFT-based frequency domain compression (Equation 5) are (L, p, v o , β, α, N ph ). In one example, the value sets for these codebook parameters are as follows:

[0169] L: The value set is generally {2, 4}, except for rank 1 and rank 2, 32 CSI-RS antenna ports and R=1, L∈{2, 4, 6}.

[0170] For p of rank 1 and rank 2, and for (p, v o ): as well as

[0171] ·

[0172] α∈{1.5, 2, 2.5, 3}

[0173] ·N ph ∈{8, 16}

[0174] The present disclosure proposes a method for configuring these codebook parameters (L, p, v o , β, α, N ph In one example, the configuration is signaled via a higher layer (eg, RRC).

[0175] In one embodiment 1, the codebook parameters (L, p, v) are configured to the UE via a separate configuration entity (or field or state or configuration parameter) for each codebook parameter. o , β, α, N ph ). Therefore, the number of individually configured entities is equal to the number of codebook parameters (6). Table 1 shows an example of individually configured entities (CE). In one example, the value L=6 for CE1 is limited to 32 CSI-RS antenna ports, rank 1 or rank 2, and R=1.

[0176] Table 1: Example of configuring entities individually

[0177]

[0178] In one embodiment 2, the codebook parameters (L, p, v) are configured to the UE via a single (joint) configuration entity for all codebook parameters.o , β, α, N ph ). Therefore, the number of configuration entities is 1. Table 2 shows an example of a joint configuration entity (CE). In one example, the CE value indicating L=6 is limited to 32 CSI-RS antenna ports, rank 1 or rank 2, and R=1.

[0179] Table 2: Example of federated configuration entities

[0180]

[0181] The CE value (or joint RRC parameter) is configured according to the value set {x0, x1, ..., x15}. In one example, x0, x1, ..., x15 are mapped to 0, 1, ..., 15, respectively. In one example, x0, x1, ..., x15 are mapped to 1, 2, ..., 16, respectively.

[0182] In one embodiment 3, the codebook parameters (L, p, v) are configured to the UE via two sets (S1 and S2) of configuration entities. o , β, α, N ph ),in:

[0183] S1: Include x 1 A separate configuration entity, wherein each configuration entity configures a single codebook parameter;

[0184] S2: Include x 2 A joint configuration entity is provided, wherein each configuration entity configures at least two codebook parameters.

[0185] The number of configuration entities is equal to x 1 +x 2 .

[0186] In one example 3-1, S1 includes codebook parameters N ph x 1 = 1 configuration entity CE1, and S2 includes codebook parameters (L, p, v o ,β,α) 2 =1 configuration entity CE2. Table 3 shows an example of two sets of configuration entities. In one example, the CE2 value indicating L=6 is limited to 32 CSI-RS antenna ports, rank 1 or rank 2, and R=1.

[0187] Table 3: Example of configuration entities for two collections

[0188]

[0189] The CE2 value (or joint RRC parameter) is configured according to the value set {x0, x1, ..., x8}. In one example, x0, x1, ..., x8 are mapped to 0, 1, ..., 8, respectively. In one example, x0, x1, ..., x8 are mapped to 1, 2, ..., 9, respectively.

[0190] In an example 3-2, S1 includes codebook parameters α and N respectively. ph x 1 = 2 configuration entities CE1 and CE2, and S2 includes codebook parameters (L, p, v o ,β) 2 =1 configuration entity CE3. Table 4 shows an example of two sets of configuration entities. In one example, the CE2 value indicating L=6 is limited to 32 CSI-RS antenna ports, rank 1 or rank 2, and R=1.

[0191] Table 4: Example of configuration entities for two collections

[0192]

[0193] The CE3 value (or joint RRC parameter) is configured according to the value set {x0, x1, ..., x8}. In one example, x0, x1, ..., x8 are mapped to 0, 1, ..., 8, respectively. In one example, x0, x1, ..., x8 are mapped to 1, 2, ..., 9, respectively.

[0194] In one embodiment 3-3, the indication The combined CE value (CE3 value x in Table 3 and Table 4) 7 ) with

[0195] In Example 3-4, add the instruction Another combined CE value (CE3 value x in Table 3 and Table 4) 9 ).

[0196] In one example 3-5, the α value (1.5, 2) in Table 3 and Table 4 is replaced with (2, 2.5) or (1.5, 2.5).

[0197] In Embodiment 4, the codebook parameters (L, p, v) are configured to the UE via two sets (S1 and S2). o , β, α, N ph ),in:

[0198] S1: Include x 1 A joint configuration entity is provided, wherein each configuration entity configures at least two codebook parameters.

[0199] S2: includes fixed x 2 codebook parameters, so these codebook parameters do not need to be configured (or included in the configuration).

[0200] The number of configuration entities is equal to x 1 .

[0201] In an example 4-1, S2 includes a value fixed to N ph = x of 16 2 = 1 codebook parameter N ph , and S1 includes the codebook parameters (L, p, v o ,β,α) 1 =1 configuration entity. An example of a configuration entity is CE2 in Table 3. In one example, the CE2 value indicating L=6 is limited to 32 CSI-RS antenna ports, rank 1 or rank 2, and R=1.

[0202] In one example 4-2, S2 includes a fixed value of α=2 and N ph = x of 16 2 = 2 codebook parameters α and N ph , and S1 includes the codebook parameters (L, p, v o ,β) 1 =1 configuration entity. An example of a configuration entity is CE2 in Table 4. In one example, the CE2 value indicating L=6 is limited to 32 CSI-RS antenna ports, rank 1 or rank 2, and R=1.

[0203] In one example 4-2A, S2 includes a value (for 16PSK phase) fixed to α=2 and N ph = x of 16 2 = 2 codebook parameters α and N ph , and S1 includes the codebook parameters (L, p, v o ,β) 1 = 1 configuration entity. An example of a configuration entity is the CE in Table 5. In one example, the CE value (x 6 and x 7 ) is limited to 32 CSI-RS antenna ports, rank 1 or rank 2, and R = 1. In another example, the CE value (x) indicating L = 6 6 and x 7 ) is limited to 32 CSI-RS antenna ports and rank 1 or rank 2. It should be noted that, compared with the CE value {x o , and x 2 -x 7} corresponding codebook parameters (L, p, v o , β) are included in those CE3 values ​​{xo , and x 2 -x 5 , x 7 , x 8}middle.

[0204] Table 5: Example of configuration entities for two collections

[0205]

[0206] The CE value (or joint RRC parameter) is configured according to the value set {x0, x1, ..., x7}. In one example, x0, x1, ..., x7 are mapped to 0, 1, ..., 7, respectively. In one example, x0, x1, ..., x7 are mapped to 1, 2, ..., 8, respectively.

[0207] In Example 4-3, the instruction The combined CE values ​​(CE values ​​x in Tables 3 and 4) 7 ) with

[0208] In Example 4-4, add the instruction Another combined CE value (CE value x in Table 3 and Table 4) 9 ).

[0209] In one example 4-5, the α value (1.5, 2) in Table 3 and Table 4 is replaced with (2, 2.5) or (1.5, 2.5).

[0210] In one embodiment 5, the codebook parameters (L, p, v) are configured to the UE via two sets (S1 and S2). o , β, α, N ph ),in:

[0211] S1: Include x 1 A separate configuration entity is provided, wherein each configuration entity configures a single codebook parameter.

[0212] S2: contains fixed x 2 codebook parameters, so these codebook parameters do not need to be configured (or included in the configuration).

[0213] The number of configuration entities is equal to x 1 .

[0214] In one embodiment 6, the codebook parameters (L, p, v) are configured to the UE via three sets (S1, S2 and S3). o , β, α, N ph ),in:

[0215] S1: Include x1 A joint configuration entity is provided, wherein each configuration entity configures at least two codebook parameters.

[0216] S2: Include x 2 A separate configuration entity is provided, wherein each configuration entity configures a single codebook parameter.

[0217] S3: including fixed x 3 codebook parameters, so these codebook parameters do not need to be configured (or included in the configuration).

[0218] The number of configuration entities is equal to x 1 +x 2 .

[0219] In one example 6-1, S2 includes codebook parameters N ph x 2 = 1 configuration entity CE2, S1 includes codebook parameters (L, p, v o ,β) 1 = 1 configuration entity CE1, and S3 includes x whose value is fixed to α = 2 3 = 1 codebook parameter α. Table 6 shows an example of configuration entities. In one example, the CE1 value indicating L=6 is limited to 32 CSI-RS antenna ports, rank 1 or rank 2, and R=1.

[0220] Table 6: Example of configuration entity

[0221]

[0222] The CE1 value (or joint RRC parameter) is configured according to the value set {x0, x1, ..., x8}. In one example, x0, x1, ..., x8 are mapped to 0, 1, ..., 8, respectively. In one example, x0, x1, ..., x8 are mapped to 1, 2, ..., 9, respectively.

[0223] In one example 6-2, S2 includes codebook parameters β and N respectively. ph x 2 = 2 configuration entities CE1 and CE2, and S1 includes codebook parameters (L, p, v o ) 1 = 1 configuration entity CE3, and S3 includes x whose value is fixed to α = 2 3 = 1 codebook parameter α. Table 7 shows an example of configuration entity. In one example, the CE3 value indicating L=6 is limited to 32 CSI-RS antenna ports, rank 1 or rank 2, and R=1.

[0224] Table 7: Example of configuration entity

[0225]

[0226] The CE3 value (or joint RRC parameter) is configured according to the value set {x0, x1, ..., x4}. In one example, x0, x1, ..., x4 are mapped to 0, 1, ..., 4, respectively. In one example, x0, x1, ..., x4 are mapped to 1, 2, ..., 5, respectively.

[0227] In Example 6-3, add the instruction Another combined CE value of (in Table 6 and Table 7).

[0228] In one example 6-4, the α value (1.5, 2) in Table 6 and Table 7 is replaced with (2, 2.5) or (1.5, 2.5).

[0229] Fig.14 A flow chart illustrating a method 1400 that may be performed by a user equipment (UE), such as UE 116, for operating the UE for channel state information (CSI) reporting in a wireless communication system according to an embodiment of the present disclosure. Fig.14 The illustrated embodiment of method 1400 is for illustration only. Fig.14 The scope of the present disclosure is not limited to any particular implementation.

[0230] like Fig.14 As shown, method 1400 starts at step 1402. In step 1402, UE (such as Figure 1 111 to 116) shown in FIG. 111 receive channel state information (CSI) feedback configuration information from a base station (BS), including codebook parameters jointly configured via a single radio resource control (RRC) parameter, wherein the codebook parameters include L, p, vo, and β, wherein the parameter L determines the number of spatial domain (SD) basis vectors, the parameter β determines the maximum number of coefficients, and the parameter p and the parameter v o Determine the number of frequency domain (FD) basis vectors (M v ), where parameter p is used for the first rank set and parameter v o For the second rank set.

[0231] In step 1404, the UE generates CSI feedback based on the CSI feedback configuration information, wherein the CSI feedback is generated for a rank value v from one of the first rank set and the second rank set.

[0232] In step 1406, the UE sends CSI feedback to the BS on an uplink channel.

[0233] In one embodiment, the mapping of codebook parameters jointly configured via a single RRC parameter is based on the determination of the table given below:

[0234]

[0235] Therein, a value of a single RRC parameter is configured to the UE, wherein the value is configured according to a value set {x0, x1, ..., x7}.

[0236] In one embodiment, when the UE is configured with less than 32 channel state information reference signal (CSI-RS) antenna ports, or the UE is allowed to report a rank value v>2, or the UE is configured with R=2, which indicates that the UE is allowed to report up to 2 precoding matrices in each sub-band configured for CSI feedback, it is not expected to configure the UE with a value of a single RRC parameter of x6 or x7 indicating parameter L=6.

[0237] In one embodiment, the CSI feedback includes AM v A set of FD basis vectors, where if the rank value v belongs to the first rank set, then M v is determined based on the parameter p, and if the rank value v belongs to the second rank set, then M v is based on the parameter v o To be determined.

[0238] In one embodiment, the first rank set includes rank values ​​{1, 2} and the second rank set includes rank values ​​{3, 4}.

[0239] In one embodiment, Where: for the first rank set, q = p, and for the second rank set, q = v 0 , is the upper limit function, N 3 is the total number of FD units, and R is the maximum number of FD units in each sub-band configured for CSI feedback.

[0240] In one embodiment, the CSI feedback includes a coefficient matrix C indicating the coefficient matrix for each layer l=1, ..., v l , SD basic matrix A l and the FD basis matrix B l The precoding matrix indicator (PMI) of 3 The precoding matrix of each FD unit in the FD units is given by The columns are determined, where A l =[a l， 0a l，1 …a l，L-1 ] includes L basis vectors for SD antenna ports, a l，i YesN 1 N 2×1 column vector, where N 1 and N 2 are respectively the number of antenna ports having the same antenna polarization in the first dimension and the second dimension of a two-dimensional dual-polarized channel state information-reference signal (CSI-RS) antenna port located at the BS; Includes M for FD units v basis vectors, b l，k YesN 3 ×1 column vector; C l is the complex coefficient c l，i，k 2L×M v matrix; and, the total number of FD units (N 3 ) is determined based on the value of R and the number of sub-bands configured for CSI feedback.

[0241] Fig.15 A flow chart illustrating another method 1500 that may be performed by a base station (BS), such as BS 102, according to an embodiment of the disclosure. Fig.15 The illustrated embodiment of method 1500 is for illustration only. Fig.15 The scope of the present disclosure is not limited to any particular implementation.

[0242] like Fig.15 As shown, method 1500 begins at step 1502. In step 1502, a BS (e.g., Figure 1 101 to 103) shown in FIG. 101 generate CSI feedback configuration information.

[0243] In step 1504, the BS sends CSI feedback configuration information to a user equipment (UE), wherein the CSI feedback configuration information includes codebook parameters jointly configured via a single radio resource control (RRC) parameter, wherein the codebook parameters include L, p, v o and β, where the parameter L determines the number of spatial domain (SD) basis vectors, the parameter β determines the maximum number of coefficients, and the parameters p and v o Determine the number of frequency domain (FD) basis vectors (M v ), where parameter p is used for the first rank set and parameter v o For the second rank set.

[0244] In step 1506, the BS sends channel state information (CSI) feedback configuration information to the user equipment (UE).

[0245] In one embodiment, the mapping of codebook parameters jointly configured via a single RRC parameter is based on the determination of the table given below:

[0246]

[0247] Therein, a value of a single RRC parameter is configured to the UE, wherein the value is configured according to a value set {x0, x1, ..., x7}.

[0248] In one embodiment, when the CSI feedback configuration information configures less than 32 channel state information reference signal (CSI-RS) antenna ports, or allows a rank value v>2, or configures R=2, which indicates that the UE is allowed to report up to 2 precoding matrices in each sub-band configured for CSI feedback, it is not expected to take a value x6 or a value x7 for a single RRC parameter indicating parameter L=6.

[0249] In one embodiment, the CSI feedback includes M v A set of FD basis vectors, where if the rank value v belongs to the first rank set, then M v is determined based on the parameter p, and if the rank value v belongs to the second rank set, then M v is based on the parameter v o To be determined.

[0250] In one embodiment, the first rank set includes rank values ​​{1, 2} and the second rank set includes rank values ​​{3, 4}.

[0251] In one embodiment, Where: for the first rank set, q = p, and for the second rank set, q = v o , is the upper limit function, N 3 is the total number of FD units, and R is the maximum number of FD units in each sub-band configured for CSI feedback.

[0252] In one embodiment, the CSI feedback includes a coefficient matrix C indicating the coefficient matrix for each layer l=1, .., v l , SD basic matrix A l and the FD basis matrix B l The precoding matrix indicator (PMI) of 3 The precoding matrix of each FD unit in the FD units is given by The columns are determined, where A l =[a l，0 a l，1 …a l，L-1 ] includes L basis vectors for SD antenna ports, a l，i YesN 1 N 2 ×1 column vector, where N 1 and N 2are respectively the number of antenna ports having the same antenna polarization in the first dimension and the second dimension of a two-dimensional dual-polarized channel state information-reference signal (CSI-RS) antenna port located at the BS; Includes M for FD units v basis vectors, b l，k YesN 3 ×1 column vector; C l is the complex coefficient c l，i，k 2L×M v matrix; and, the total number of FD units (N 3 ) is determined based on the value of R and the number of sub-bands configured for CSI feedback.

[0253] Although the present disclosure has been described with exemplary embodiments, various changes and modifications may be shown to those skilled in the art. It is contemplated that the present disclosure includes such changes and modifications that fall within the scope of the appended claims. Any description in this application should not be construed as implying 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 method performed by a user equipment (UE) for channel state information (CSI) feedback in a wireless communication system, the method comprising: receiving, via higher layer signaling, a radio resource control (RRC) parameter indicating a combination of codebook parameters, the codebook parameters comprising a first value L associated with the first vector, a second value associated with the second vector, and a third value β associated with a coefficient; wherein the second value is one of p or v0, wherein the p is associated with the M vector for the first rank set and the v0 is associated with the M vector for the second rank set; and A precoding matrix indicator (PMI) associated with the RRC parameters is sent on an uplink channel, Among them, for the first rank set, And for the second rank set, and N3 is a value associated with the precoding matrix, and R is configured by a higher layer parameter, and The first rank set includes rank values ​​{1, 2}, and the second rank set includes rank values ​​{3, 4}.

2. The method according to claim 1, wherein: The mapping of the combination of the codebook parameters to the RRC parameters is determined based on the table given below: Wherein, an RRC parameter value is configured to the UE, wherein the value is configured from a value set {1, ..., 8}.

3. The method according to claim 2, wherein: When less than 32 channel state information reference signal (CSI-RS) antenna ports are configured for the UE, an RRC parameter value of 7 or 8 is not configured for the UE.

4. The method according to claim 2, wherein: When 32 channel state information reference signal (CSI-RS) antenna ports are configured for the UE, an RRC parameter value of 7 or 8 is configured for the UE.

5. The method according to claim 2, wherein: When the rank value v satisfies v>2, the RRC parameter value of 7 or 8 is not configured for the UE.

6. The method according to claim 2, wherein: When the rank value v satisfies v=1, an RRC parameter value of 7 or 8 is configured for the UE.

7. The method according to claim 2, wherein: When R=2 is configured for the UE, an RRC parameter value of 7 or 8 is not configured for the UE, and Here, R=2 indicates that the UE reports up to 2 precoding matrices in each sub-band configured for CSI feedback.

8. The method according to claim 2, wherein: When R=1 is configured for the UE, an RRC parameter value of 7 or 8 is configured for the UE, and Wherein, R=1 indicates that the UE reports a precoding matrix in each sub-band configured for CSI feedback.

9. The method according to claim 1, wherein: The CSI feedback includes a coefficient matrix C indicating the coefficient matrix for each layer l=1, ..., v l , SD basic matrix A l and the FD basis matrix B l The precoding matrix indicator (PMI) of in: The precoding matrix for each FD unit in the total number N3 FD units is given by The columns are determined, where A l =[a l，0 a l，1 …a l，L-1 ] includes L basis vectors for SD antenna ports, a l，i is an N1N2×1 column vector, where N1 and N2 are the number of antenna ports having the same antenna polarization in the first dimension and the second dimension of the two-dimensional dual-polarized channel state information-reference signal (CSI-RS) antenna ports located at the BS, respectively; Includes M for FD units v basis vectors, b l，k is an N3×1 column vector; C l is the complex coefficient c l，i，k 2L×M v Matrix; and The total number of FD units N3 is determined based on the value of R and the number of sub-bands configured for CSI feedback. in: in: For the first rank set, q=p, and for the second rank set, q=v0, is the upper limit function, N3 is the total number of FD units, and R is the maximum number of FD units in each sub-band configured for CSI feedback.

10. A method performed by a base station (BS) for channel state information (CSI) feedback in a wireless communication system, the method comprising: generating a radio resource control (RRC) parameter indicating a combination of codebook parameters, the codebook parameters comprising a first value L associated with the first vector, a second value associated with the second vector, and a third value β associated with a coefficient; wherein the second value is one of p or v0, wherein the p is associated with the M vector for the first rank set and the v0 is associated with the M vector for the second rank set; and sending RRC parameters to a user equipment UE via higher layer signaling; and receiving a precoding matrix indicator (PMI) associated with the RRC parameters from the UE on an uplink channel, Among them, for the first rank set, And for the second rank set, and N3 is a value associated with the precoding matrix, and R is configured by a higher layer parameter, and The first rank set includes rank values ​​{1, 2}, and the second rank set includes rank values ​​{3, 4}.

11. The method according to claim 10, wherein: The mapping of the combination of the codebook parameters to the RRC parameters is determined based on the table given below: Wherein, an RRC parameter value is configured to the UE, wherein the value is configured from a value set {1, ..., 8}.

12. The method according to claim 11, wherein: In the following cases, the RRC parameter takes the value 7 or 8: The UE is configured with fewer than 32 channel state information reference signal (CSI-RS) antenna ports, The rank value v satisfies v>2, or The UE is configured with R=2.

13. The method according to claim 11, wherein: In the following cases, the RRC parameter takes the value 7 or 8: Configure 32 channel state information reference signal CSI-RS antenna ports for the UE. The rank value v satisfies v = 1, or The UE is configured with R=1.

14. A user equipment (UE), comprising: Transceiver; and A processor coupled to the transceiver and configured to control: Receiving from a higher layer a radio resource control (RRC) parameter indicating a combination of codebook parameters, the codebook parameters comprising a first value L associated with the first vector, a second value associated with the second vector, and a third value β associated with a coefficient; wherein the second value is one of p or v0, wherein the p is associated with the M vector for the first rank set and the v0 is associated with the M vector for the second rank set; and Among them, for the first rank set, And for the second rank set, and N3 is a value associated with the precoding matrix, and R is configured by a higher layer parameter, and A precoding matrix indicator (PMI) associated with the RRC parameters is sent on an uplink channel, The first rank set includes rank values ​​{1, 2}, and the second rank set includes rank values ​​{3, 4}.

15. The UE according to claim 14, wherein: The mapping of the combination of the codebook parameters to the RRC parameters is determined based on the table given below: Wherein, an RRC parameter value is configured to the UE, wherein the value is configured from a value set {1, ..., 8}.

16. The UE according to claim 15, wherein: When less than 32 channel state information reference signal (CSI-RS) antenna ports are configured for the UE, an RRC parameter value of 7 or 8 is not configured for the UE.

17. The UE according to claim 15, wherein: When the rank value v satisfies v>2, the RRC parameter value of 7 or 8 is not configured for the UE.

18. The UE according to claim 15, wherein: When R=2 is configured for the UE, an RRC parameter value of 7 or 8 is not configured for the UE, and Here, R=2 indicates that the UE reports up to 2 precoding matrices in each sub-band configured for CSI feedback.

19. A base station (BS), comprising: Transceiver; and A processor coupled to the transceiver and configured to control: generating a radio resource control (RRC) parameter indicating a combination of codebook parameters, the codebook parameters comprising a first value L associated with the first vector, a second value associated with the second vector, and a third value β associated with a coefficient; wherein the second value is one of p or v0, wherein the p is associated with the M vector for the first rank set and the v0 is associated with the M vector for the second rank set; and sending RRC parameters to a user equipment UE (116) via higher layer signaling; and receiving a precoding matrix indicator (PMI) associated with the RRC parameters from the UE on an uplink channel, Among them, for the first rank set, And for the second rank set, and N3 is a value associated with the precoding matrix, and R is configured by a higher layer parameter, and The first rank set includes rank values ​​{1, 2}, and the second rank set includes rank values ​​{3, 4}.

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