Overhead reduction for high-resolution multi-transmit reception point (multi-TRP) precoding matrix indication (PMI)

Abstract

Wireless communication systems and methods related to multi-transmit receive point (multi-TRP) precoding matrix indication (PMI) operations are provided. A user equipment (UE) may receive a configuration indicating a precoder size parameter for multiple transmit receive points (TRPs). The UE receives a first reference signal from a first TRP of the multiple TRPs. The UE receives a second reference signal from a second TRP of the multiple TRPs, the second TRP being different from the first TRP. The UE sends a channel state information (CSI) report to the first TRP or the second TRP, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

Description

Technical Field

[0001] In general, the technology described below relates to wireless communication systems, and more specifically, the technology described below relates to multiple transmit receive point (multi-TRP) precoding matrix indication (PMI) operation. Certain embodiments may implement and provide techniques that allow a communication device (e.g., a user equipment device or a base station) to efficiently report high-resolution PMIs for multiple TRPs in a combined report (e.g., with minimal overhead). Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). A wireless multiple-access communication system may include multiple base stations (BSs), each of which simultaneously supports communication for multiple communication devices, which may also be referred to as user equipment (UE).

[0003] In order to meet the growing demand for extended mobile broadband connectivity, wireless communication technology is developing from long term evolution (LTE) technology to next generation new radio (NR) technology (which may be referred to as the 5th generation (5G)). For example, compared with LTE, NR is designed to provide lower latency, higher bandwidth or higher throughput, and higher reliability. NR is designed to operate on a variety of spectrum bands (e.g., from low frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high frequency bands such as millimeter wave (mm wave) bands). NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed spectrum and shared spectrum. Spectrum sharing enables operators to opportunistically aggregate spectrum to dynamically support high bandwidth services. Spectrum sharing can extend the benefits of NR technology to operating entities that may not have access to licensed spectrum.

[0004] NR is also designed to enhance channel capacity by leveraging advanced massive multiple-input multiple-output (MIMO) and beamforming techniques. The benefits of MIMO can rely on transmitters having accurate (e.g., high-resolution) channel state information (CSI) so that the transmitter can form high-quality transmission beams for communicating with corresponding receivers. One method for facilitating the transmitter to form high-quality transmission beams is for the corresponding receiver to feed back high-resolution CSI to the transmitter. Summary of the invention

[0005] The following summarizes some aspects of the present disclosure to provide a basic understanding of the technology discussed. This summary is not a general overview of all expected features of the present disclosure, and is neither intended to identify key or important elements of all aspects of the present disclosure, nor is it intended to describe the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in an overview form as a preface to a more detailed description presented later.

[0006] Some aspects of the present disclosure provide various mechanisms and techniques for implementing efficient multi-transmission reception point (multi-TRP) channel state information (CSI) reporting with high-resolution precoding matrix indication (PMI). In certain deployments, a network may communicate with a user equipment (UE) via multiple TRPs. Multiple TRPs may send reference signals to facilitate precoder parameter selection at the UE, and the UE may feedback the PMI for each TRP based on the precoder parameter selection. The network may control the amount of information or payload size that the UE may use to report the PMI for all TRPs in a combined report. PMI feedback for each TRP may include selection of spatial domain components, selection of frequency domain components, and precoding matrix coefficients. The network may configure the UE using a threshold associated with at least one of the following: the number of spatial domain components, the number of frequency domain components, a parameter associated with the number of coefficients, or a quantization level for precoding matrix coefficients.

[0007] For example, in one aspect of the present disclosure, a method of wireless communication includes: receiving, by a user equipment (UE), a configuration indicating a precoder size parameter for a plurality of transmit receive points (TRPs). The method may also include: receiving, by the UE, a first reference signal from a first TRP of the plurality of TRPs. The method may also include: receiving, by the UE, a second reference signal from a second TRP of the plurality of TRPs, the second TRP being different from the first TRP. The method may also include: sending, by the UE, a channel state information (CSI) report to the first TRP or the second TRP, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0008] In another aspect of the present disclosure, a method of wireless communication includes: sending, by a base station (BS), a configuration indicating a precoder size parameter for a plurality of transmit receive points (TRPs). The method may also include: sending, by the BS, a first reference signal via a first TRP of the plurality of TRPs. The method may also include: sending, by the BS, a second reference signal via a second TRP of the plurality of TRPs, the second TRP being different from the first TRP. The method may also include: receiving, by the BS, a channel state information (CSI) report, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0009] In another aspect of the present disclosure, a user equipment (UE) includes a transceiver configured to receive a configuration indicating a precoder size parameter for multiple transmit receive points (TRPs). The transceiver may also be configured to receive a first reference signal from a first TRP of the multiple TRPs. The transceiver may also be configured to receive a second reference signal from a second TRP of the multiple TRPs, the second TRP being different from the first TRP. The transceiver may also be configured to send a channel state information (CSI) report to the first TRP or the second TRP, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0010] In another aspect of the present disclosure, a base station (BS) includes a transceiver configured to: send a configuration indicating a precoder size parameter for multiple transmit receive points (TRPs). The transceiver may also be configured to: send a first reference signal via a first TRP of the multiple TRPs. The transceiver may also be configured to: send a second reference signal via a second TRP of the multiple TRPs, the second TRP being different from the first TRP. The transceiver may also be configured to: receive a channel state information (CSI) report, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0011] In another aspect of the present disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code comprising: code for causing a user equipment (UE) to receive a configuration indicating a precoder size parameter for multiple transmit receive points (TRPs). The program code may also include: code for causing the UE to receive a first reference signal from a first TRP in the multiple TRPs; code for causing the UE to receive a second reference signal from a second TRP in the multiple TRPs, the second TRP being different from the first TRP. The program code may also include: code for causing the UE to send a channel state information (CSI) report to the first TRP or the second TRP, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0012] In another aspect of the present disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code comprising: code for causing a base station (BS) to transmit a configuration indicating a precoder size parameter for a plurality of transmit receive points (TRPs). The program code may also include: code for causing the BS to transmit a first reference signal via a first TRP of the plurality of TRPs. The program code may also include: code for causing the BS to transmit a second reference signal via a second TRP of the plurality of TRPs, the second TRP being different from the first TRP. The program code may also include: code for causing the BS to receive a channel state information (CSI) report, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0013] In another aspect of the present disclosure, a user equipment (UE) includes: a unit for receiving a configuration indicating a precoder size parameter for multiple transmit reception points (TRPs). The UE may also include: a unit for receiving a first reference signal from a first TRP of the multiple TRPs. The UE may also include: a unit for receiving a second reference signal from a second TRP of the multiple TRPs, the second TRP being different from the first TRP. The UE may also include: a unit for sending a channel state information (CSI) report to the first TRP or the second TRP, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0014] In another aspect of the present disclosure, a base station (BS) includes: a unit for sending a configuration indicating a precoder size parameter for multiple transmit reception points (TRPs). The BS may also include: a unit for sending a first reference signal via a first TRP of the multiple TRPs. The BS may also include: a unit for sending a second reference signal via a second TRP of the multiple TRPs, the second TRP being different from the first TRP. The BS may also include: a unit for receiving a channel state information (CSI) report, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0015] When reviewing the following description of specific exemplary embodiments in conjunction with the accompanying drawings, other aspects, features, and aspects will become apparent to those of ordinary skill in the art. Although features may be discussed below with respect to certain embodiments and the accompanying drawings, all embodiments may include one or more of the advantageous features discussed herein. In other words, although one or more embodiments may be discussed as having certain advantageous features, one or more of such features may also be used according to the various embodiments discussed herein. In a similar manner, although exemplary embodiments may be discussed below as device, system, or method embodiments, it should be understood that such exemplary embodiments may be implemented in various devices, systems, and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A wireless communication network in accordance with some aspects of the present disclosure is shown.

[0017] Figure 2A wireless communication network implementing multiple transmit reception point (TRP) channel state information (CSI) reporting according to some aspects of the present disclosure is shown.

[0018] Figure 3 A multi-TRP CSI reporting method according to some aspects of the present disclosure is shown.

[0019] Figure 4 A multi-TRP CSI reporting method according to some aspects of the present disclosure is shown.

[0020] Figure 5 is a block diagram of a user equipment (UE) according to some aspects of the present disclosure.

[0021] Figure 6 is a block diagram of a base station (BS) according to some aspects of the present disclosure.

[0022] Figure 7 is a block diagram of a transmit reception point (TRP) according to some aspects of the present disclosure.

[0023] Figure 8 is a signaling diagram illustrating a multi-TRP CSI reporting method according to some aspects of the present disclosure.

[0024] Fig. 9 is a flow chart of a multi-TRP CSI reporting method according to some aspects of the present disclosure.

[0025] Fig.10 is a flow chart of a method of wireless communication according to some aspects of the present disclosure.

[0026] Fig.11 is a flow chart of a method of wireless communication according to some aspects of the present disclosure. DETAILED DESCRIPTION

[0027] The specific embodiments described below in conjunction with the accompanying drawings are intended to be a description of various configurations, rather than being intended to represent the only configuration in which the concepts described herein can be practiced. For the purpose of providing a thorough understanding of various concepts, the specific embodiments include specific details. However, it is apparent to those skilled in the art that these concepts can be practiced without these specific details. In some cases, known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0028] In summary, the present disclosure relates to wireless communication systems, also referred to as wireless communication networks. In various embodiments, the techniques and devices may be used for wireless communication networks such as the following and other communication networks: code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, global mobile communication systems (GSM) networks, 5th generation (5G) or new radio (NR) networks. As described herein, the terms "network" and "system" may be used interchangeably.

[0029] OFDMA network can realize radio technology such as Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDM, etc. UTRA, E-UTRA and GSM are part of Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a version of UMTS using E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided by an organization named "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are known or are being developed. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between telecommunication association groups with the goal of defining a globally applicable third generation (3G) mobile phone specification. 3GPP Long Term Evolution (LTE) is a 3GPP plan with the goal of improving the UMTS mobile phone standard. 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure relates to the evolution of wireless technologies according to LTE, 4G, 5G, NR and beyond, with shared access to wireless spectrum between networks using some new and different radio access technologies or radio air interfaces.

[0030] 5G networks are expected to enable diverse deployments, diverse spectrums, and diverse services and devices using a unified air interface based on OFDM. To achieve these goals, in addition to the development of new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also considered. 5G NR will be able to expand to: (1) provide coverage to the massive Internet of Things (IoT) with ultra-high density (e.g., ~1M nodes / km2), ultra-low complexity (e.g., ~10s of bits / second), ultra-low energy (e.g., ~10+ years of battery life), and deep coverage with the ability to reach challenging locations; (2) provide coverage including mission-critical control with strong security for protecting sensitive personal, financial, or confidential information, ultra-high reliability (e.g., ~99.9999% reliability), ultra-low latency (e.g., ~1 millisecond), and provide coverage to users with a wide range of mobility or lack of mobility; and (3) provide coverage with enhanced mobile broadband, including extremely high capacity (e.g., ~10Tbps / km2), extremely high data rates (e.g., multi-Gbps rates, 100+Mbps user experienced rates), and deep awareness with improved discovery and optimization.

[0031] The 5G NR communication system can be implemented using an optimized OFDM-based waveform with a scalable numerology and transmission time interval (TTI). Additional features may also include a common flexible structure to efficiently multiplex services and features using a dynamic, low-latency time division duplex (TDD) / frequency division duplex (FDD) design; and improved wireless technologies such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, improved channel coding, and device-centric mobility. The scalability of the digital scheme in 5G NR (among which the scaling of subcarrier spacing) can efficiently address the operation of diverse services across diverse spectrums and diverse deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD / TDD implementations, the subcarrier spacing can appear at 15kHz, for example, on 5, 10, 20MHz with similar bandwidths (BW). For various other outdoor and small cell coverage deployments with TDD greater than 3 GHz, subcarrier spacing may occur at 30 kHz on 80 / 100 MHz BW. For various other indoor broadband implementations using TDD on the unlicensed portion of the 5 GHz band, subcarrier spacing may occur at 60 kHz on 160 MHz BW. Finally, for various deployments that transmit using the mm-wave component at TDD at 28 GHz, subcarrier spacing may occur at 120 kHz on 500 MHz BW.

[0032] 5G NR's scalable digital scheme facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmissions to start on symbol boundaries. 5G NR also anticipates a self-contained integrated subframe design with UL / downlink scheduling information, data, and acknowledgment in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, and can be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet current business needs. Adaptive UL / downlink.

[0033] The various other aspects and features of the present disclosure are further described below. It should be apparent that the teachings herein can be embodied in a variety of forms, and any specific structure, function, or both disclosed herein are representative and non-limiting. Based on the teachings herein, it is understood by those of ordinary skill in the art that the aspects disclosed herein can be implemented independently of any other aspects, and two or more of these aspects can be combined in various ways. For example, using any number of aspects set forth herein, a device can be implemented or a method can be practiced. In addition, using other structures, functions, or structures and functions other than or different from one or more aspects of the aspects set forth herein, such a device can be implemented, or such a method can be practiced. For example, a method can be implemented as a part of a system, device, device, and / or as an instruction stored on a computer-readable medium for execution on a processor or computer. In addition, an aspect can include at least one element of a claim.

[0034] In wireless communications, channel state information (CSI) may refer to known channel properties of a communication link. CSI may indicate how a signal may propagate from a transmitter to a receiver in the air. CSI may indicate, for example, the combined channel effects of scattering, fading, and / or power attenuation as the distance between the transmitter and the receiver. Channel estimation may be performed to determine these effects on the channel. CSI may be used to adapt transmission based on current channel conditions, which is useful for achieving reliable communication (especially at high data rates in multi-antenna systems). CSI is typically estimated, quantized, and fed back to the transmitter at the receiver. CSI may include various feedback information, such as a rank indicator (RI), a channel quality indicator (CQI), and / or a precoding matrix indicator (PMI).

[0035] The PMI may include a wideband precoding matrix and a frequency selective subband precoding matrix. The wideband precoding matrix and the frequency selective subband precoding matrix may be represented in the form of one or more codebooks, which may be used by the transmitter for precoding. Precoding may refer to forming a beam with a specific directivity (angular direction) and transmit power at the transmitter by weighting the signal phase and amplitude of an antenna or antenna element at the transmitter.

[0036] A wireless communication system may utilize multiple transmit receive points (TRPs) to communicate with a user equipment (UE), for example, to improve reliability, coverage, and / or capacity performance. Each of the TRPs may apply precoding to the transmission. Thus, the UE may feed back CSI for each TRP so that each TRP may perform appropriate precoding to form a beam for communicating with the UE. However, the overhead of sending high-resolution CSI feedback for each TRP may be significant.

[0037] Various mechanisms and techniques for efficiently reporting multi-TRP CSI with high-resolution PMI are described herein. In certain deployments, the network may communicate with the UE via multiple TRPs. Multiple TRPs may send reference signals to facilitate precoder parameter selection at the UE, and the UE may feedback the PMI for each TRP based on the precoder parameter selection. The network may control the amount of information or payload size that the UE may use to report the PMI for all TRPs in a combined report. The PMI feedback for each TRP may include the selection of a spatial domain basis, the selection of a frequency domain basis, and the precoding matrix coefficient. The network may configure a threshold for the number of spatial domain bases that the UE may report for each TRP or a threshold for the combined number of spatial domain bases that the UE may report for all TRPs. Additionally or alternatively, the network may configure a threshold for the number of frequency domain bases that the UE may report for each TRP or a threshold for the combined number of frequency domain bases that the UE may report for all TRPs. Additionally or alternatively, the network may configure a threshold for the number of precoding matrix coefficients that the UE may report for each TRP or a threshold for the combined number of precoding matrix coefficients that the UE may report for all TRPs. Additionally or alternatively, the network may configure a threshold on the number of per-coefficient quantization bits that the UE may use for each TRP or a threshold on the combined number of per-coefficient quantization bits that the UE may use for all TRPs.

[0038] Various aspects of the present disclosure may provide several benefits. For example, a control UE may be used to report the number of spatial domain bases, the number of frequency domain bases, the number of precoding matrix coefficients, and / or the number of quantization bits per coefficient for a combined CSI report for multiple TRPs, which may allow the UE to report a high-resolution PMI with minimal increase in CSI report payload overhead. Feedback of a high-resolution PMI for each TRP allows each TRP to form a high-quality beam for communication with the UE. The disclosed embodiments allow the UE to feedback a multi-TRP CSI report with a high-resolution PMI in a single transmission for all TRPs communicating with the UE or a subset of TRPs communicating with the UE.

[0039] Figure 1 A wireless communication network 100 is shown according to some aspects of the present disclosure. The network 100 may be a 5G network. The network 100 includes a plurality of base stations (BSs) 105 (labeled 105a, 105b, 105c, 105d, 105e, and 105f, respectively) and other network entities. The BS 105 may be a station that communicates with the UE 115, and may also be referred to as an evolved Node B (eNB), a next generation eNB (gNB), an access point, etc. Each BS 105 may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the particular geographic coverage area of ​​the BS 105 and / or the BS subsystem serving the coverage area, depending on the context in which the term is used.

[0040] BS105 may provide communication coverage for macro cells or small cells (such as pico cells or femto cells) and / or other types of cells. Macro cells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions with a network provider. Small cells (such as pico cells) will typically cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions with a network provider. Small cells (such as femto cells) will also typically cover a relatively small geographic area (e.g., a residence) and, in addition to unrestricted access, may also provide restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in a residence, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS, or a home BS. In Figure 1In the example shown in , BS105d and 105e may be conventional macro BSs, while BS105a-105c may be macro BSs implemented with one of three-dimensional (3D) MIMO, full-dimensional (FD) MIMO, or massive MIMO. BS105a-105c may utilize its higher-dimensional MIMO capabilities to utilize 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity. BS105f may be a small cell BS, which may be a home node or a portable access point. BS105 may support one or more (e.g., two, three, four, etc.) cells.

[0041] Network 100 may support synchronous operation or asynchronous operation. For synchronous operation, the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time. For asynchronous operation, the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.

[0042] UE 115 is scattered throughout the wireless network 100, and each UE 115 can be stationary or mobile. UE 115 can also be referred to as a terminal, a mobile station, a user unit, a station, etc. UE 115 can be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, etc. In one aspect, UE 115 can be a device including a universal integrated circuit card (UICC). In another aspect, UE 115 can be a device that does not include a UICC. In some aspects, UE 115 that does not include a UICC can also be referred to as an IoT device or an Internet of Everything (IoE) device. UE 115a-115d is an example of a mobile smart phone type device accessed to the network 100. UE 115 can also be a machine that is specially configured for connected communications (including machine type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc.). UE 115e-115h are examples of various machines configured for communication that access network 100. UE 115i-115k are examples of vehicles equipped with wireless communication devices configured for communication that access network 100. UE 115 may be able to communicate with any type of BS (whether macro BS, small cell, etc.). Figure 1 , lightning (e.g., communication link) indicates wireless transmission between UE 115 and serving BS 105 (which is a BS designated to serve UE 115 on downlink (DL) and / or uplink (UL)), or expected transmission between BS 105, backhaul transmission between BSs, or sidelink transmission between UE 115.

[0043] When in operation, BS105a-105c can use 3D beamforming and coordinated spatial techniques (e.g., coordinated multi-point (CoMP) or multi-connectivity) to serve UEs 115a and 115b. Macro BS105d can perform backhaul communications with BS105a-105c and small cell BS105f. Macro BS105d can also send multicast services that are subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile TV or streaming video, or may include other services for providing community information, such as weather emergencies or alerts (e.g., Amber Alerts or Gray Alerts).

[0044] The base stations 105 may also communicate with a core network. The core network may provide user authentication, access grant, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. At least some of the base stations 105 (e.g., which may be examples of gNBs or access node controllers (ANCs)) may interface with the core network via a backhaul link (e.g., NG-C, NG-U, etc.), and may perform radio configuration and scheduling for communications with the UE 115. In various examples, the BSs 105 may communicate with each other directly or indirectly (e.g., via a core network) via a backhaul link (e.g., X1, X2, etc.), which may be a wired or wireless communication link.

[0045] The network 100 may also support mission-critical communications with ultra-reliable and redundant links for mission-critical devices (e.g., UE 115e, which may be a drone). The redundant communication links with UE 115e may include links from macro BSs 105d and 105e and links from small cell BS 105f. Other machine-type devices, such as UE 115f (e.g., a thermometer), UE 115g (e.g., a smart meter), and UE 115h (e.g., a wearable device), may communicate directly with a BS (such as small cell BS 105f and macro BS 105e) through the network 100, or communicate through the network 100 in a multi-step configuration by communicating with another user device that relays its information to the network, such as UE 115f transmitting temperature measurement information to the smart meter (UE 115g), which is then reported to the network through the small cell BS 105f. The network 100 may also provide additional network efficiency through dynamic, low-latency TDD / FDD communications, such as V2V, V2X, C-V2X communications between UE 115i, 115j, or 115k and other UEs 115, and / or vehicle-to-infrastructure (V2I) communications between UE 115i, 115j, or 115k and BS 105.

[0046] In some implementations, the network 100 communicates using an OFDM-based waveform. An OFDM-based system may divide the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, frequency bands, etc. Each subcarrier may be modulated with data. In some cases, the subcarrier spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may depend on the system BW. The system BW may also be divided into subbands. In other cases, the subcarrier spacing and / or the duration of the TTI may be scalable.

[0047] In some aspects, BS105 may assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RBs)) for downlink (DL) and uplink (UL) transmissions in network 100. DL refers to the transmission direction from BS105 to UE 115, and UL refers to the transmission direction from UE 115 to BS105. Communication may be in the form of radio frames. Radio frames may be divided into a plurality of subframes or time slots, e.g., about 10. Each time slot may be further divided into micro-time slots. In FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands. For example, each subframe includes a UL subframe in a UL frequency band and a DL subframe in a DL frequency band. In TDD mode, UL and DL transmissions using the same frequency band occur at different time periods. For example, a subset of subframes in a radio frame (e.g., DL subframes) may be used for DL ​​transmissions, while another subset of subframes in the radio frame (e.g., UL subframes) may be used for UL transmissions.

[0048] DL subframes and UL subframes may be further divided into several regions. For example, each DL or UL subframe may have a predefined region for the transmission of reference signals, control information, and data. A reference signal is a predetermined signal that facilitates communication between BS105 and UE115. For example, a reference signal may have a specific pilot pattern or structure, wherein a pilot tone may traverse a working BW or frequency band, and each pilot tone is located at a predefined time and a predefined frequency. For example, BS105 may send a cell-specific reference signal (CRS) and / or a channel state information-reference signal (CSI-RS) to enable UE 115 to estimate a DL channel. Similarly, UE 115 may send a sounding reference signal (SRS) to enable BS105 to estimate an UL channel. Control information may include resource assignments and protocol control. Data may include protocol data and / or operational data. In some aspects, BS105 and UE 115 may communicate using a self-contained subframe. A self-contained subframe may include a portion for DL ​​communication and a portion for UL communication. A self-contained subframe may be DL-centric or UL-centric. A DL-centric subframe may include a longer duration for DL ​​communications (compared to the duration for UL communications). A UL-centric subframe may include a longer duration for UL communications (compared to the duration for UL communications).

[0049] In some aspects, the network 100 may be an NR network deployed on a licensed spectrum. The BS 105 may send synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) in the network 100 to facilitate synchronization. The BS 105 may broadcast system information associated with the network 100 (e.g., including a master information block (MIB), remaining system information (RMSI), and other system information (OSI)) to facilitate initial network access. In some cases, the BS 105 may broadcast the PSS, SSS, and / or MIB on a physical broadcast channel (PBCH) in the form of a synchronization signal block (SSB), and may broadcast the RMSI and / or OSI on a physical downlink shared channel (PDSCH).

[0050] In some aspects, a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from the BS 105. The PSS may enable synchronization of period timing and may indicate a physical layer identification value. The UE 115 may then receive the SSS. The SSS may enable radio frame synchronization and may provide a cell identification value that may be combined with the physical layer identification value to identify a cell. The PSS and SSS may be located in the center portion of the carrier or in any suitable frequency within the carrier.

[0051] After receiving the PSS and SSS, the UE 115 may receive the MIB. The MIB may include system information for initial network access and scheduling information for RMSI and / or OSI. After decoding the MIB, the UE 115 may receive the RMSI and / or OSI. The RMSI and / or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource set (CORESET) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH), physical UL shared channel (PUSCH), power control, and SRS.

[0052] After obtaining the MIB, RMSI and / or OSI, the UE 115 may perform a random access procedure to establish a connection with the BS 105. In some examples, the random access procedure may be a four-step random access procedure. For example, the UE 115 may send a random access preamble, and the BS 105 may respond with a random access response. The random access response (RAR) may include a detected random access preamble identifier (ID), timing advance (TA) information, UL authorization, a temporary cell radio network temporary identifier (C-RNTI), and / or a fallback indicator corresponding to the random access preamble. Upon receiving the random access response, the UE 115 may send a connection request to the BS 105, and the BS 105 may respond with a connection response. The connection response may indicate contention resolution. In some examples, the random access preamble, the RAR, the connection request, and the connection response may be referred to as message 1 (MSG1), message 2 (MSG2), message 3 (MSG3), and message 4 (MSG4), respectively. In some examples, the random access procedure may be a two-step random access procedure, where the UE 115 may send a random access preamble and a connection request in a single transmission, and the BS 105 may respond by sending a random access response and a connection response in a single transmission.

[0053] After establishing the connection, the UE 115 and the BS 105 may enter a normal operation phase in which operational data may be exchanged. For example, the BS 105 may schedule the UE 115 for UL and / or DL ​​communications. The BS 105 may send UL and / or DL ​​scheduling grants to the UE 115 via the PDCCH. The scheduling grant may be sent in the form of DL control information (DCI). The BS 105 may send DL communication signals (e.g., carrying data) to the UE 115 via the PDSCH according to the DL scheduling grant. The UE 115 may send UL communication signals to the BS 105 via the PUSCH and / or PUCCH according to the UL scheduling grant.

[0054] In some aspects, the network 100 may operate on a system BW or a component carrier (CC) BW. The network 100 may divide the system BW into multiple BWPs (e.g., parts). The BS 105 may dynamically assign the UE 115 to operate on a specific BWP (e.g., a specific part of the system BW). The assigned BWP may be referred to as an active BWP. The UE 115 may monitor the active BWP for signaling information from the BS 105. The BS 105 may schedule the UE 115 to perform UL or DL ​​communications in the active BWP. In some aspects, the BS 105 may assign a pair of BWPs within the CC to the UE 115 for UL and DL communications. For example, the BWP pair may include a BWP for UL communication and a BWP for DL ​​communication.

[0055] In some aspects, BS105 may use HARQ technology to communicate with UE 115 to improve communication reliability, such as to provide URLLC service. BS105 may schedule UE 115 for PDSCH communication by sending DL grant in PDCCH. BS105 may send DL data packets to UE 115 according to the scheduling in PDSCH. DL data packets may be sent in the form of transport blocks (TBs). If UE 115 successfully receives the DL data packet, UE 115 may send HARQ ACK (e.g., in PUCCH) to BS105. On the contrary, if UE 115 fails to successfully receive the DL transmission, UE 115 may send HARQ NACK (e.g., in PUCCH) to BS105. When HARQ NACK is received from UE 115, BS 105 may retransmit the DL data packet to UE115. The retransmission may include the same coded version of the DL data as the initial transmission. Alternatively, the retransmission may include a coded version of the DL data different from the initial transmission. The UE 115 may apply soft combining to combine the coded data received from the initial transmission and the retransmission for decoding. The BS 105 and the UE 115 may also apply HARQ to UL communications using a substantially similar mechanism as DL HARQ.

[0056] In some aspects, BS105 and UE 115 can communicate with each other by utilizing MIMO and beamforming techniques. For example, BS105 can send a reference signal to UE 115. The reference signal can be referred to as CSI-RS and includes predetermined pilot symbols so that UE 115 can estimate the DL channel between BS105 and UE 115. In order to facilitate beamforming at BS105, UE115 can feed back CSI (e.g., an estimate of the DL channel) to BS105. In some aspects, BS105 can perform precoding to generate a transmission beam with a specific directivity and / or a specific transmit power. The precoding process can include weighting the signal phase and / or signal amplitude at the antenna element of BS105. In order to facilitate the precoding process, UE 115 can include PMI in the CSI feedback. PMI can include information associated with a broadband precoding matrix and a frequency selective subband precoding matrix, as will be discussed in more detail below.

[0057] In some aspects, the network 100 may utilize multiple TRPs to communicate with the UE 115, for example, to improve reliability, coverage, and / or capacity performance. For example, the BS 105 may be coupled to multiple TRPs and may communicate with the UE 115 via the multiple TRPs. As similarly discussed above, the multiple TRPs may also apply MIMO and beamforming techniques to communicate with the UE 115, and the UE 115 may feedback CSI for each of the TRPs. The mechanism for reporting CSI for multiple TRPs is described in more detail herein.

[0058] Figure 2 A wireless communication network 200 is shown that implements multi-TRP CSI reporting according to some aspects of the present disclosure. The network 200 may correspond to a portion of the network 100. For the purpose of simplifying the discussion, Figure 2Two TRPs 210 and 220 are shown communicating with one UE 215, but it will be appreciated that embodiments of the present disclosure may be extended to more UEs 215 and / or TRPs 210 and 220. UE 215 may be similar to UE 115. Each of TRPs 210 and 220 may include a radio frequency (RF) front end configured for wireless signal transmission and reception. TRPs 210 and 220 may be coupled to BS 205 similar to BS 105. In some cases, TRPs 210 and / or 220 may be co-located with BS 205. In some other cases, TRPs 210 and / or 220 may be located at a remote location. In some cases, TRPs 210 and / or 220 may have similar functionality to BS 105. For example, certain BS operations (such as baseband processing and / or protocol processing) may be distributed to TRPs 210 and / or 220. In some other cases, baseband processing and / or protocol processing may be centralized at BS 205 .

[0059] In some aspects, each of the TRPs 210 and 220 and the UE 215 may have an array of antenna elements and may apply beamforming techniques to communicate with each other. The antenna array may be in the form of a single panel or multiple panels. Each antenna panel may include multiple antenna ports or elements in the vertical dimension and multiple antenna ports or elements in the horizontal dimension. In some examples, the TRPs 210 and 220 may each have a multi-panel antenna, and the UE 215 may have a single panel antenna. In some other examples, the TRP 210, TRP 220, and UE 215 may each have a multi-panel antenna. Figure 2 In the example shown, TRP 210 can form beam 212 in a series of angular directions by weighting signal phase and amplitude at the antenna elements. Similarly, TRP 220 can form beam 222 in a series of angular directions. Each of TRPs 210 and 220 can communicate with UE 215 using the best beam. The best beam can refer to a high-quality beam, for example, where the beam can have the highest received signal power among a set of beams measured at UE 215.

[0060] In order to facilitate the UE 215 to select the best beam 212 from the TRP 210 and the best beam 222 from the TRP 220, the TRP 210 may use one or more beams 212 to send the CSI-RS 214, and the TRP 220 may use one or more beams 222 to send the CSI-RS 224. Each of the CSI-RS 214 and 224 may include a predetermined sequence or a predetermined pilot symbol sequence. The TRP 210 may send the CSI-RS 214 at a configured time and frequency position and using one or more configured beams 212. In addition, the TRP 210 may send the CSI-RS 214 using different beams 212 at different times and frequencies and / or using different combinations of beams 212 at different times and frequencies. The TRP 210 may configure the UE 115 with the configured time and frequency resources and the configured beams 212 for sending the CSI-RS 214. UE 215 may receive CSI-RS 214, perform measurements on CSI-RS 214, and determine the best beam 212 or the best combination of beams 212 for receiving DL communications from TRP 210. TRP 220 may send CSI-RS 224 using a substantially similar mechanism as TRP 210, and UE 215 may perform similar measurements on CSI-RS 224 as on CSI-RS 214.

[0061] exist Figure 2 In the example shown, the best beam 212 from TRP 210 to UE 215 may correspond to beam 212a and beam 212b (shown by the beams of the fill pattern). In some cases, beams 212a and / or 212b may reach UE 215 via a direct line of sight (LOS) path. In some cases, beams 212a and / or 212b may reach UE 215 via a non-direct LOS path, for example, from some scattering or cluster scattering in the environment. Similarly, the best beam 222 from TRP 220 to UE 215 may correspond to beam 222a and beam 222b (shown by the beams of the fill pattern).

[0062] In some aspects, TRPs 210 and 220 may utilize codebook-based transmission to form beams 212 and 214, respectively, for communication with UE 215. For example, TRP 210 may perform precoding based on the codebook to generate beams 212a and 212b. The codebook may be in the form of one or more matrices, which may include selection of beams, selection of weights for scaling the amplitude and / or phase at the antenna elements of TRP 210 and / or at the antenna ports of TRP 210. In some cases, the antenna ports may be virtual antenna ports, which may or may not have a direct mapping to the physical antenna elements at TRP 210. In some cases, the codebook may have a dual codebook structure including a wideband matrix and a frequency selective subband matrix, as will be discussed in more detail below. The codebook may be a predetermined or preconfigured codebook known to TRP 210 and UE 215. Thus, the UE 215 may select the best beams 212a and 212b, selecting from the codebook the weights for the amplitude and / or phase for the beams 212a and 212b. The UE 215 may feed back the selected codebook information to the TRP 210. The TRP 210 may then apply precoding based on the received codebook information to form transmission beams 212a and 212b with corresponding phase and / or amplitude weights for communication with the UE 215. The feedback codebook information may be referred to as PMI. Similarly, the UE 215 may determine the codebook information for the TRP 220 based on measurements performed on the CSI-RS 224 using a similar mechanism as described for the TRP 210.

[0063] In some aspects, UE 215 may send a multi-TRP CSI report 230 that includes a PMI for TRP 210 and a PMI for 220. UE 215 may send the multi-TRP CSI report 230 to one of TRPs 210 and 220. For example, UE 215 may send the multi-TRP CSI report 230 to TRP 220, as shown. Alternatively, UE 215 may send the multi-TRP CSI report 230 to TRP 210 instead of TRP 220. In some cases, BS 205 may configure UE 215 to report the multi-TRP CSI report 230 to a specific TRP. In some other cases, UE 215 may select a TRP from which to report the multi-TRP CSI report 230. The multi-TRP CSI report 230 may also be referred to as a combined CSI report or a joint CSI report. Although Figure 2UE 215 is shown communicating with two TRPs 210 and 220, but UE 215 may communicate with any suitable number of TRPs (e.g., approximately 3, 4, or more). When UE 215 communicates with multiple TRPs, the UE may feed back a multi-TRP CSI report 230 to one of the multiple TRPs, wherein the multi-TRP CSI report 230 may include a PMI for each of the multiple TRPs.

[0064] In some aspects, the UE 215 may use a type IICSI codebook for PMI feedback, as described in the following document: 3GPP document TS 38.214 Release 15, entitled "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Physical layer procedures for data," December 2019, Section 5.2.2, which is incorporated herein by reference. The 3GPP Release 15 Type IICSI codebook may provide high-resolution CSI. The high-resolution CSI may provide an accurate approximation of the channel to the TRPs 210 and / or 220, and may therefore provide high communication performance, such as in terms of spectral efficiency and signal quality (e.g., signal-to-noise ratio (SNR) and / or signal-to-interference plus noise ratio (SINR)). However, the high-resolution CSI or PMI includes a large amount of information payload to be fed back to the TRPs 210 and 220. Therefore, the overhead of feeding back the high-resolution PMI is high. For example, the generation of high-resolution PMI may increase the processing complexity of the UE, and the transmission or signaling of high-resolution PMI may increase BW utilization. 3GPP Release 16 attempts to reduce the overhead associated with high-resolution CSI or PMI feedback by transforming part of the feedback (e.g., the frequency selective subband matrix) to a different domain.

[0065] Combination Figure 2 discuss Figure 3 and Figure 4 , to illustrate the mechanism for reporting high-resolution PMI for multiple TRPs. Figure 3 A multi-TRP CSI reporting method 300 according to some aspects of the present disclosure is shown. The method 300 may be used by a base station (such as base station 105 and / or 205), a TRP (such as TRP 210 and 220), and a UE (such as UE 115 and 215) in a network (such as network 100 and 200) for communication. Specifically, as shown in the method 300, UE 215 may feed back PMI to TRPs 210 and 220. Figure 3In the example shown, the PMI between the UE 215 and the TRP 210 is shown as a precoding matrix 310, which is represented as W (1) , and the PMI between UE 215 and TRP 220 is shown as a precoding matrix 320, which is represented as W (2) .

[0066] Precoding matrix 310W (1) A weighted linear combination of L orthogonal beams in each spatial layer and each polarization is included. The L orthogonal beams may be similar to beams 212 and 214. As an example, the weighted linear combination of each spatial layer and each polarization of the L orthogonal beams may be represented as follows:

[0067]

[0068] Among them, r represents polarization, l represents the spatial layer, and b i represents the i-th orthogonal beam, w r,l represents the beam coefficient per spatial layer per polarization (e.g., for the lth spatial layer in the rth polarization), Indicates that it is used for b i The broadband amplitude per polarization per spatial layer, Indicates that it is used for b i The subband amplitude weighting per polarization per spatial layer, c r,l,i Indicates that it is used for b i The subband phase per polarization and per spatial layer.

[0069] Precoding matrix 310W (1) The wideband precoding matrix 312 (represented as ) and the subband precoding matrix 314 (denoted as ) to indicate, for example Figure 3 and as follows:

[0070]

[0071] Wideband precoding matrix 312 Can have Dimensions (e.g., Line and 2L (1) List). represents the number of antenna ports at TRP 210 in the horizontal domain (e.g., ) and the number of antenna ports at TRP 210 in the vertical domain (e.g., ),in Value L (1) represents the number of beams or spatial domain bases selected from the oversampled discrete Fourier transform (DFT) beams of TRP 210. In other words, the wideband precoding matrix Including 2L (1) For example, in Figure 2 The beam 212 shown in FIG. 1 is an oversampled DFT beam. The subband precoding matrix Can have Dimensions (e.g., 2L (1) Line and column). Value The subband precoding matrix may represent the number of subbands used by the TRP 210 for communication with the UE 215. is a coefficient matrix and can include The coefficients can include (1) The amplitude weights and phase weights of each beam (for example, The spatial domain basis can also be called the spatial domain component.

[0072] Similarly, the precoding matrix 320W (2) The per-spatial-layer per-polarization beam coefficients may be included similar to the precoding matrix as shown in equation (1), and may be represented as a wideband precoding matrix 322 (which is represented as ) and the subband precoding matrix 324 (which is represented as ),like Figure 3 and as follows:

[0073]

[0074] Wideband precoding matrix 322 Can have Dimensions (e.g., Line and 2L (2) List). The number of antenna ports at TRP 210 in the horizontal domain may be represented (eg, ) and the number of antenna ports at TRP 220 in the vertical domain (e.g., ),in L (2) represents the number of beams or spatial domain bases selected from the oversampled discrete Fourier transform (DFT) beams of TRP 220. The subband precoding matrix Can have Dimensions (e.g., 2L (2) Line and List). The number of subbands used by TRP 220 for communication with UE 215 can be represented.

[0075] UE 215 can indicate the wideband precoding matrix and the subband precoding matrix To indicate or report the precoding matrix 310W to TRP 210 (1) UE 215 can use the codebook to indicate the wideband precoding matrix For example, The oversampled DFT beams may be configured beams known to the TRP 210 and the UE 215. The codebook may include a representation of the oversampled DFT beams. The UE 215 may indicate the selection of L among the beams by indicating a particular codeword formed from the codebook. (1) The UE 215 can indicate the subband precoding matrix by quantizing the coefficients For example, each coefficient may be quantized to about 3 bits or about 4 bits. The UE 215 may use a substantially similar mechanism to transmit the wideband precoding matrix and the subband precoding matrix The associated information is fed back to TRP 220.

[0076] Used to indicate the wideband precoding matrix The amount of information (e.g., in terms of CSI report payload bits) may not be significant because the indication may include a codebook index. However, the information used to indicate the subband precoding matrix The amount of information (e.g., in terms of CSI report payload bits) may be large because the indication may include the subband precoding matrix In Similarly, for indicating the wideband precoding matrix The amount of information (e.g., in terms of CSI report payload bits) may not be significant, but is useful for indicating the subband precoding matrix It may be big.

[0077] When UE 215 sends a PMI for TRP 220 (including and information) and PMI for TRP220 (including and When a single multi-TRP CSI report 230 is used for each TRP (e.g., PMI feedback is reported for each TRP in communication with the UE 215), the payload of the multi-TRP CSI report 230 may be large. If the UE 215 is connected to a larger number of TRPs (e.g., about 3 or 4), the multi-TRP CSI report 230 may scale with the number of TRPs because one PMI feedback is reported for each TRP in communication with the UE 215.

[0078] Thus, method 300 provides techniques for limiting the amount of PMIs that UE 215 can feed back to TRPs 210 and 210, so that the overhead associated with multi-TRP PMI feedback can be reduced while maintaining high resolution (e.g., channel information with high accuracy) for each TRP PMI.

[0079] For example, in method 300, BS 205 may limit the total number of spatial domain bases (e.g., L (1) Value or L (2) For example, BS 205 may configure UE 215 with configuration 330 indicating a threshold total number of spatial domain bases that UE 215 may select for all TRPs (eg, TRPs 210 and 220) connected to UE 215, which is denoted as L total For example, for TRP 210 and TRP 220, L (1) +L (2) ≤L total In some cases, BS 205 may select L from a set of values ​​(eg, {4, 6, 8}). total In other words, L total can have a value of 4, 6, or 8. In some cases, the threshold value L in configuration 330 total Can depend on the total number of TRPs. For example, for 2 TRPs, L total can be set to a value of 6, and for 3 TRPs, L total Can be set to a value of 8. When BS205 indicates L total When the value is, UE 215 can total To determine l (1) and l (2) , and according to the determined L (1) and the determined L (2) To generate PMI for TRP 210 and 220.

[0080] In some aspects, BS 205 may limit the number of spatial domain bases (e.g., L (1) Value or L (2) For example, BS 205 may configure UE 215 with configuration 340 indicating a per-TRP L value. For example, configuration 340 may indicate a per-TRP L value. (1) The value and for L (2) Therefore, UE 215 can use the configured L (1) value to generate the PMI for the TRP 210 and may be based on the configured L(2) The value is used to generate the PMI for the TRP 220. In some other aspects, the BS 205 can configure the UE 215 using both configurations 330 and 340.

[0081] Figure 4 A multi-TRP CSI reporting method 400 is shown in accordance with some aspects of the present disclosure. The method 400 may be used by a base station (such as base station 105 and / or 205), a TRP (such as TRP 210 and 220), and a UE (such as UE 115 and 215) in a network (such as networks 100 and 200) for communication. Specifically, as shown in the method 400, UE 215 may feed back the PMI to TRPs 210 and 220. The method 400 may be substantially similar to the method 300, but may include a subband precoding matrix (e.g., a wideband precoding matrix ) and the subband precoding matrix ) to the DFT domain to reduce PMI reporting overhead (e.g., multi-TRP CSI report payload size), as described in 3GPP 38.214 Release 16. Method 400 may use the same spatial domain base matrix or wideband precoding matrix 312 and 322 as in method 300, and for simplicity, may use the same base matrix as in Figure 3 The same reference numerals are used in the drawings.

[0082] exist Figure 4 In the example shown, by applying frequency domain compression, the subband precoding matrix Transformed into coefficient matrix 416 (which is denoted as C (1) ) and the frequency compression matrix 418 (which is represented as ). The precoding matrix with frequency domain compression can be represented as precoding matrix 410W (1) , as in Figure 4 and as follows:

[0083]

[0084] Frequency Compression Matrix Can have The dimension (for example, M (1) Line and M (1) M (1) Represents the frequency compression matrix The number of frequency domain bases in the frequency compression matrix Similar to the wideband precoding matrix But in the frequency domain. For example, M (1) represents the number of frequency domain bases selected from the oversampled DFT codebook. After frequency domain compression, M (1) Can have less than The frequency domain compression may be applied to each spatial layer and each polarization. The UE 215 may (1) The codewords of the frequency domain basis are fed back to TRP 210. Coefficient matrix 416C (1) Can have 2L (1) ×M (1) Dimensions (e.g., 2L (1) Line and M (1) Columns). Coefficient matrix 416C (1) may include a matrix for wideband precoding 2L (1) The linear combination of the space domain basis weights the amplitude coefficients and phase coefficients. Coefficient matrix 416C (1) can be sparse, for example, not in the coefficient matrix 416C (1) All matrix elements in may have non-zero values ​​(or valid values). Therefore, UE 215 may select to add quantized coefficient matrix 416C to the matrix. (1) and feeds it back to TRP 210. In some cases, UE 215 may apply a threshold value to the coefficient matrix 416C. (1) The coefficients in the frequency domain are reported, and the coefficients exceeding the threshold are reported. The frequency domain basis can also be called the frequency domain component.

[0085] Similar frequency domain compression can be applied to the subband precoding matrix Subband precoding matrix is transformed into a coefficient matrix 426 (which is denoted as C (2) ) and the frequency compression matrix 428 (which is represented as ). The precoding matrix with frequency domain compression is represented as precoding matrix 420W (2) , as shown below:

[0086]

[0087] Frequency Compression Matrix Can have The dimension (for example, M (2) Line and M (2) Represented in frequency compression matrix UE 215 may identify M (2) The codewords of the frequency domain basis are fed back to TRP 220. Coefficient matrix 426C (2) Can have 2L (2) ×M (2) Dimensions (e.g., 2L (2) Line and M (2) Similarly, UE 215 may select quantization coefficient matrix 426C.(2) and feeds it back to TRP 220.

[0088] UE 215 can indicate the wideband precoding matrix and the wideband precoding matrix To report the PMI for TRP 210 and TRP 220, as referenced above Figure 3 UE 215 may indicate the frequency compression matrix using a similar mechanism as for wideband precoding matrices 312 and 322. and the frequency compression matrix For example, the oversampled DFT codebook may be configured and known by the TRP 210 and the UE 215. The codebook may include a representation of the oversampled frequency domain basis. The UE 215 may indicate the use of the M from the codebook by indicating a specific codeword formed from the oversampled DFT codebook. (1) Similarly, UE 215 may indicate the selection of M from an oversampled DFT codebook (configured at TRP 220 and UE 215) by indicating a particular codeword formed from the codebook. (2) In some cases, TRPs 210 and 220 may utilize the same oversampled DFT codebook. In some other cases, TRPs 210 and 220 may utilize different oversampled DFT codebooks.

[0089] UE 215 may indicate in coefficient matrix 416C (1) Sum coefficient matrix 426C (2) UE 215 may report the non-zero coefficients in coefficient matrix 416C. (1) Sum coefficient matrix 426C (2) For example, UE 215 may use a 2×L (1) ×M (1) (corresponding to coefficient matrix 416C (1) The coefficient matrix 416C is indicated by a bitmap of size (1) The non-zero coefficients in the bitmap, where each bit in the bitmap may correspond to a coefficient in the coefficient matrix 416C. (1) Similarly, UE 215 can use a size of 2×L (2) ×M (2) (corresponding to coefficient matrix 426C (2) The coefficient matrix 426C is indicated by a bitmap of size (2) The non-zero coefficients in the bitmap, where each bit in the bitmap may correspond to a coefficient in the coefficient matrix 426C. (2) UE 125 may select the position in coefficient matrix 416C.(1) Sum coefficient matrix 426C (2) quantize the non-zero coefficients in and report the quantized coefficient values. (1) bits to the coefficient matrix 416Q (1) The non-zero coefficients or significant coefficients in are quantized, and Q (2) bits to the coefficient matrix 426c (2) The non-zero coefficients or significant coefficients in are quantized.

[0090] In some aspects, coefficient matrix 416C (1) The number of non-zero coefficients in each layer can be given by K0 (1) Represented as follows:

[0091]

[0092] Among them, β (1) is a parameter that controls the number of non-zero coefficients per spatial layer to be reported to TRP 210. In some cases, β (1) β may depend on the rank (e.g., the number of spatial layers) used for communication between TRP 210 and UE 215. For example, for a rank less than or equal to 2 (e.g., with one spatial layer or two spatial layers), β (1) can be set to a value of 1 / 4 or 1 / 2. For ranks greater than 2 (e.g., more than two spatial layers), BS 205 may limit the total number of coefficients to be reported for all spatial layers to, for example,

[0093] Similarly, in coefficient matrix 426C (2) The number of non-zero coefficients per spatial layer in can be given by Represented as follows:

[0094]

[0095] Among them, β (2) is a parameter that controls the number of non-zero coefficients per spatial layer to be reported to TRP 220.

[0096] Although the method 400 may utilize frequency domain compression to reduce the PMI payload size, when multi-TRP CSI reporting is used, the PMI amount or payload size may scale with the number of TRPs. Therefore, the method 400 provides techniques for limiting or constraining the values ​​of M (e.g., the number of frequency domain bases), β (e.g., a scaling factor for the number of coefficients), and / or Q (e.g., the number of quantization levels or quantization bits for each coefficient) for multi-TRP CSI reporting.

[0097] In some aspects, BS 205 may limit the total number of frequency domain bases that UE 215 may use for a multi-TRP CSI report (e.g., report 230). For example, BS 205 may configure UE 215 with configuration 432 indicating a threshold total number of spatial domain bases, denoted M, that UE 215 may select for TRPs (e.g., TRPs 210 and 220) connected to UE 215. total For example, for TRP 210 and TRP 220, M (1) +M (2) ≤M total In some cases, BS 205 may select M from a set of values total In some cases, the threshold value M in configuration 432 is total M may depend on the total number of TRPs. For example, for 2 TRPs, M total can be set to a value of 4, and for 3 TRPs, M total Can be set to a value of 6. When BS 205 indicates M total When the value is total To determine M (1) and M (2) , and according to the determined M (1) and the determined M (2) To generate PMI for TRP210 and 220.

[0098] In some aspects, BS 205 may limit the number of frequency domain bases (e.g., M) that UE 215 may select for each TRP. (1) Value or M (2) For example, BS 205 may configure UE 215 with configuration 442 indicating a value for M per TRP. For example, configuration 442 may indicate a value for M (1) The value and for M (2) Therefore, UE 215 can use the configured M (1) The PMI for TRP 210 may be generated based on the configured M (2) value to generate the PMI for TRP 220.

[0099] In some aspects, BS 205 may provide a common β value (as shown in configuration 434, represented as β for all TRPs connected to UE 215). common ) to limit the total number of coefficients that UE 215 can report for a multi-TRP CSI report (e.g., report 230). (1) Apply to beta common , and the set β (2)Apply to beta common . For β (1) and β (2) The control of the values ​​and the control of the coefficient matrix 416C (1) Sum coefficient matrix 426C (2) In other words, BS 205 may set the total number of coefficients (e.g., K) that UE 215 may report. total ) is limited to

[0100] In some aspects, BS 205 may limit the number of coefficients that UE 215 may report for each TRP. For example, BS 205 may configure UE 215 with configuration 444 indicating a value of β per TRP. As shown, BS 205 may indicate the number of coefficients for β. (1) The value of and for β (2) Therefore, UE 215 can be based on the configured β (1) The PMI for TRP 210 may be generated based on the configured β (2) value to generate the PMI for TRP 220.

[0101] In some cases, the total rank (or total number of spatial layers) between TRPs used for communication with UE 215 is greater than 2. As an example, UE 215 may utilize two spatial layers to communicate with TRP 210 and may utilize one spatial layer to communicate with TRP 220. As another example, UE 215 may utilize one spatial layer to communicate with TRP 210 and may utilize two spatial layers to communicate with TRP 220. As another example, UE 215 may utilize two spatial layers to communicate with TRP 210 and may utilize two spatial layers to communicate with TRP 220. When the total rank between TRPs is greater than 2, BS 205 may increase the number of spatial layers by applying a scaling factor X to K. o To further control the coefficient matrix 416C (1) Sum coefficient matrix 426C (2) The total number of coefficients to be reported. For example, for coefficient matrix 416C (1) Sum coefficient matrix 426C (2) The number of coefficients to be reported can be determined by K o In one example, the scaling factor X may be approximately 2.

[0102] In some aspects, BS 205 may limit the number of UEs 215 may use to report (in coefficient matrix 416C) in a multi-TRP CSI report (eg, report 230). (1) Sum coefficient matrix 426C (2)For example, BS 205 may use a threshold total number of quantization bits per coefficient (denoted as Q ) that indicates the UE 215 may use to quantize coefficients of all TRPs (e.g., TRPs 210 and 220) to be reported to the UE 215. total ) to configure UE 215. For example, for TRP 210 and TRP 220, Q (1) +Q (2) ≤Q total . In some cases, BS205 may also indicate different per-coefficient quantization levels or different numbers of per-coefficient quantization bits for the amplitude coefficient and for the phase coefficient. For example, the BS may indicate that the amplitude coefficient may be quantized to 3 bits (e.g., 8 quantization levels) and the phase coefficient may be quantized to 2 bits (e.g., 4 quantization levels). In some cases, BS205 may select different per-coefficient quantization levels for different TRPs. For example, BS205 may indicate 3 bits for quantizing each amplitude coefficient and 2 bits for quantizing each phase coefficient for reporting to TRP 210, and may indicate 2 bits for quantizing each amplitude coefficient and 2 bits for quantizing each phase coefficient for reporting to TRP 220.

[0103] In some aspects, the BS 205 may limit the per-coefficient quantization level that the UE 215 may report for each TRP. For example, the BS 205 may configure the UE 215 with a configuration 446 indicating the number of per-coefficient quantization bits per TRP. As shown, the BS 205 may indicate the number of per-coefficient quantization bits for Q (1) The value and Q (2) Therefore, UE 215 can use the configured Q (1) The PMI for TRP 210 may be generated based on the configured Q (2) value to generate the PMI for TRP 220.

[0104] In some aspects, a BS (e.g., BS 105 and / or 205) may configure a UE (e.g., UE 115 and 215) with any suitable combination of configurations 330, 432, 434, 436, 340, 442, 444, and / or 446. For example, the BS may configure the UE with a single configuration 330, 432, 434, 436, 340, 442, 444, or 446. In some other cases, the BS may configure the UE with configurations 330, 432, 434, and 436 to indicate the total number of spatial domain bases, the total number of frequency domain bases, the total number of coefficients, and the total number of quantization bits per coefficient across all TRPs to be included in the PMI report. In some other cases, the BS may configure the UE using configurations 340, 442, 444 and 446 to indicate the number of spatial domain bases per TRP, the number of frequency domain bases per TRP, the number of coefficients per TRP, and the number of quantization bits per coefficient per TRP to be included in the PMI report.

[0105] Figure 5 5 is a block diagram of an exemplary UE 500 according to some aspects of the present disclosure. UE 500 may be the UE described above. Figure 1 UE 115 discussed in or above in Figure 2 215 discussed in . As shown, UE 500 may include a processor 502, a memory 504, a PMI module 508, a transceiver 510 including a modem 512 and a radio frequency (RF) unit 514, and one or more antennas 516. These elements may communicate with each other directly or indirectly, for example, via one or more buses.

[0106] The processor 502 may include a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 502 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration.

[0107] The memory 504 may include cache memory (e.g., cache memory of the processor 502), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, a solid-state memory device, a hard drive, other forms of volatile and non-volatile memory, or a combination of different types of memory. In one aspect, the memory 504 includes a non-transitory computer-readable medium. The memory 504 may store instructions 506 or have instructions 506 recorded thereon. The instructions 506 may include: when executed by the processor 502, causing the processor 502 to perform the various aspects of the present disclosure described herein with reference to the UE 115 (e.g., Figure 1-Figure 4 and Figure 8-Figure 10 Instructions 506 may also be referred to as program code. The program code may be used to cause the wireless communication device to perform the operations, for example, by causing one or more processors (such as processor 502) to control or command the wireless communication device to do so. The terms "instructions" and "code" should be broadly interpreted to include any type of computer-readable statements. For example, the terms "instructions" and "code" may refer to one or more programs, routines, subroutines, functions, processes, etc. "Instructions" and "code" may include a single computer-readable statement or many computer-readable statements.

[0108] The PMI module 508 may be implemented via hardware, software, or a combination thereof. For example, the PMI module 508 may be implemented as a processor, circuit, and / or instructions 506 stored in the memory 504 and executed by the processor 502. In some cases, the PMI module 508 may be integrated within the modem 512. For example, the PMI module 508 may be implemented by a combination of software components (e.g., executed by a DSP or general purpose processor) and hardware components (e.g., logic gates and circuits) within the modem 512.

[0109] The PMI module 508 may be used in various aspects of the present disclosure (e.g., Figure 1-Figure 4 and Figure 8-Figure 10). For example, the PMI module 508 is configured to: receive a configuration, for example, from BS 105 or BS 205, indicating a precoder size parameter for multiple TRPs (e.g., TRPs 210 and 220); receive a first reference signal (e.g., CSI-RS 214) from a first TRP in the multiple TRPs; receive a second reference signal (e.g., CSI-RS 224) from a second TRP in the multiple TRPs; and send a multi-TRP CSI report (e.g., report 230) to the first TRP or the second TRP. The multi-TRP CSI report may include a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0110] In some aspects, the precoder size parameter is associated with a first precoder of the first TRP and a second precoder of the second TRP. In some cases, the first precoder may include a precoding matrix similar to 310W. (1) The second precoder may include a precoding matrix similar to precoding matrix 320W. (2) The precoding matrix is ​​as mentioned above. Figure 3 In some other cases, the first precoder may include a precoding matrix similar to 410W. (1) The second precoder may include a precoding matrix similar to precoding matrix 420W. (2) The precoding matrix is ​​as mentioned above. Figure 4 discussed.

[0111] In some aspects, the configuration may indicate a threshold for the number of spatial domain bases that the UE can report for each TRP or a threshold for the combined number of spatial domain bases that the UE can report for all TRPs. Additionally or alternatively, the configuration may indicate a threshold for the number of frequency domain bases that the UE can report for each TRP or a threshold for the combined number of frequency domain bases that the UE can report for all TRPs. Additionally or alternatively, the configuration may indicate a threshold for the number of precoding matrix coefficients that the UE can report for each TRP or a threshold for the combined number of precoding matrix coefficients that the UE can report for all TRPs. Additionally or alternatively, the configuration may indicate a threshold for the number of per-coefficient quantization bits that the UE can use for each TRP or a threshold for the combined number of per-coefficient quantization bits that the UE can use for all TRPs.

[0112] In some aspects, when the configuration indicates a threshold for a combined number of spatial domain bases that the UE can report for all TRPs, the PMI module 508 is configured to determine at least one of a first number of spatial domain components for the first precoder or a second number of spatial domain components for the second precoder based on the threshold.

[0113] In some aspects, when the configuration indicates a threshold for a combined number of frequency domain bases that the UE can report for all TRPs, the PMI module 508 is configured to determine at least one of a first number of frequency domain components for the first precoder or a second number of frequency domain components for the second precoder based on the threshold.

[0114] In some aspects, when the configuration indicates a threshold for the combined number of precoding matrix coefficients that the UE can report for all TRPs, the PMI module 508 is configured to determine at least one of a first non-zero value (or having a valid value) number of precoding matrix coefficients for the first precoder or a second non-zero value (or having a valid value) number of precoding matrix coefficients for the second precoder based on the threshold.

[0115] In some aspects, when the configuration indicates a combined number of per-coefficient quantization bits that the UE can use for all TRPs, the PMI module 508 is configured to determine at least one of a first number of per-coefficient quantization bits for the first precoder or a second number of per-coefficient quantization bits for the second precoder. Mechanisms for performing efficient multi-TRP CSI reporting with high-resolution PMI are described in greater detail herein.

[0116] As shown, the transceiver 510 may include a modem 512 and an RF unit 514. The transceiver 510 may be configured to communicate bidirectionally with other devices (such as BS105 and / or 205). The modem 512 may be configured to modulate and / or encode data from the memory 504 and / or the PMI module 508 according to a modulation and coding scheme (MCS) (e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a polar coding scheme, a digital beamforming scheme, etc.). The RF unit 514 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) the modulated / encoded data (e.g., CSI-RS report, multi-TRP CSI report, PMI feedback) from the modem 512 (for outbound transmission) or the modulated / encoded data of the transmission originating from another source (such as UE115 or BS105). The RF unit 514 may also be configured to perform analog beamforming in conjunction with digital beamforming. Although shown as integrated together in the transceiver 510, the modem 512 and the RF unit 514 may be separate devices that are coupled together at the UE 115 to enable the UE 115 to communicate with other devices.

[0117] The RF unit 514 may provide modulated and / or processed data (e.g., data packets (or more generally, data messages that may include one or more data packets and other information)) to the antenna 516 for transmission to one or more other devices. The antenna 516 may also receive data messages sent from other devices. The antenna 516 may provide the received data message for processing and / or demodulation at the transceiver 510. The transceiver 510 may provide the demodulated and decoded data (e.g., CSI-RS, CSI-RS report configuration, CSI-RS resource configuration, UL communication signal, PUSCH signal) to the PMI module 508 for processing. The antenna 516 may include multiple antennas with similar or different designs to maintain multiple transmission links. The RF unit 514 may configure the antenna 516.

[0118] In an aspect, the transceiver 510 may coordinate with the PMI module 508 to receive a configuration indicating a precoder size parameter for a plurality of TRPs. The transceiver 510 is also configured to receive a first reference signal from a first TRP in the plurality of TRPs. The transceiver 510 may also coordinate with the PMI module 508 to receive a second reference signal from a second TRP in the plurality of TRPs, the second TRP being different from the first TRP. The transceiver 510 may also coordinate with the PMI module 508 to send a CSI report to the first TRP or the second TRP, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0119] In an aspect, the UE 500 may include multiple transceivers 510 that implement different RATs (e.g., NR and LTE). In an aspect, the UE 500 may include a single transceiver 510 that implements multiple RATs (e.g., NR and LTE). In an aspect, the transceiver 510 may include various components, where different combinations of components may implement different RATs.

[0120] Figure 6 600 according to some aspects of the present disclosure. BS 600 may be as described above in Figure 1 BS 105 in network 100 discussed in or as described above in Figure 2 6. As shown, BS 600 may include a processor 602, a memory 604, a PMI module 608, a transceiver 610 including a modem 612 and an RF unit 614, and one or more antennas 616. These elements may communicate with each other directly or indirectly, for example, via one or more buses.

[0121] The processor 602 may have various features as a special-purpose type of processor. For example, these may include a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 602 may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration.

[0122] The memory 604 may include cache memory (e.g., cache memory of the processor 602), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, solid-state memory devices, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some aspects, the memory 604 may include non-transitory computer-readable media. The memory 604 may store instructions 606. The instructions 606 may include: when executed by the processor 602, cause the processor 602 to perform the operations described herein (e.g., Figure 1-Figure 4 , Figure 8-Figure 9 and Fig.11 Instructions 606 may also be referred to as code, which may be broadly interpreted as including any type of computer-readable statements, such as those described above. Figure 5 discussed.

[0123] The PMI module 608 may be implemented via hardware, software, or a combination thereof. For example, the PMI module 608 may be implemented as a processor, circuit, and / or instructions 606 stored in the memory 604 and executed by the processor 602. In some cases, the PMI module 608 may be integrated within the modem 612. For example, the PMI module 608 may be implemented by a combination of software components (e.g., executed by a DSP or general purpose processor) and hardware components (e.g., logic gates and circuits) within the modem 612.

[0124] The PMI module 608 can be used in various aspects of the present disclosure, for example, Figure 1-Figure 4 , Figure 8-Figure 9 and Fig.11 For example, the PMI module 608 is configured to: for example, send a configuration to a UE (such as UE 115, 215, or 500); indicate a precoder size parameter for multiple TRPs (e.g., TRPs 210 and 220); send a first reference signal (e.g., CSI-RS 214) via a first TRP in the multiple TRPs; send a second reference signal (e.g., CSI-RS 224) via a second TRP in the multiple TRPs; and, for example, receive a multi-TRP CSI report (e.g., report 230) for the first TRP or the second TRP from the UE. The multi-TRP CSI report may include a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0125] In some aspects, the precoder size parameter is associated with a first precoder of the first TRP and a second precoder of the second TRP. In some cases, the first precoder may include a precoding matrix similar to 310W. (1) The second precoder may include a precoding matrix similar to precoding matrix 320W. (2) The precoding matrix is ​​as mentioned above. Figure 3 In some other cases, the first precoder may include a precoding matrix similar to 410W. (1) The second precoder may include a precoding matrix similar to precoding matrix 420W. (2) The precoding matrix is ​​as mentioned above. Figure 4 discussed.

[0126] In some aspects, the configuration may indicate a threshold for the number of spatial domain bases that the UE can report for each TRP or a threshold for the combined number of spatial domain bases that the UE can report for all TRPs. Additionally or alternatively, the configuration may indicate a threshold for the number of frequency domain bases that the UE can report for each TRP or a threshold for the combined number of frequency domain bases that the UE can report for all TRPs. Additionally or alternatively, the configuration may indicate a threshold for the number of precoding matrix coefficients that the UE can report for each TRP or a threshold for the combined number of precoding matrix coefficients that the UE can report for all TRPs. Additionally or alternatively, the configuration may indicate a threshold for the number of per-coefficient quantization bits that the UE can use for each TRP or a threshold for the combined number of per-coefficient quantization bits that the UE can use for all TRPs. Mechanisms for configuring sidelink UEs for channel access in shared radio frequency bands and / or unlicensed bands are described in more detail herein.

[0127] As shown, the transceiver 610 may include a modem 612 and an RF unit 614. The transceiver 610 may be configured to communicate bidirectionally with other devices (such as UE 115 and / or 500 and / or another core network element). The modem 612 may be configured to modulate and / or encode data according to an MCS (e.g., an LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a polar coding scheme, a digital beamforming scheme, etc.). The RF unit 614 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) modulated / encoded data (e.g., CSI-RS, CSI-RS report configuration, CSI-RS resource configuration, UL communication signal, PUSCH signal) from the modem 612 (for outward transmission) or modulated / encoded data transmitted from another source (such as UE 115 and / or UE 500). The RF unit 614 may also be configured to perform analog beamforming in conjunction with digital beamforming. Although shown as integrated together in transceiver 610, modem 612 and / or RF unit 614 may be separate devices that are coupled together at BS 105 to enable BS 105 to communicate with other devices.

[0128] The RF unit 614 may provide modulated and / or processed data (e.g., data packets (or more generally, data messages that may include one or more data packets and other information)) to the antenna 616 for transmission to one or more other devices. According to some aspects of the present disclosure, this may include, for example, sending information to complete attachment to a network and communication with a resident UE 115 or 500. The antenna 616 may also receive data messages sent from other devices and may provide the received data messages for processing and / or demodulation at the transceiver 610. The transceiver 610 may provide the demodulated and decoded data (e.g., CSI-RS reports, multi-TRP CSI reports, PMI feedback) to the PMI module 608 for processing. The antenna 616 may include multiple antennas of similar design or different designs to maintain multiple transmission links.

[0129] In an aspect, the transceiver 610 may coordinate with the PMI module 608 to send a configuration indicating a precoder size parameter for a plurality of TRPs. The transceiver 610 is also configured to send a first reference signal via a first TRP in the plurality of TRPs. The transceiver 610 may also coordinate with the PMI module 608 to send a second reference signal via a second TRP in the plurality of TRPs, the second TRP being different from the first TRP. The transceiver 610 may also coordinate with the PMI module 608 to receive a CSI report via the first TRP or the second TRP, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0130] In an aspect, the BS 600 may include multiple transceivers 610 that implement different RATs (e.g., NR and LTE). In an aspect, the BS 600 may include a single transceiver 610 that implements multiple RATs (e.g., NR and LTE). In an aspect, the transceiver 610 may include various components, where different combinations of components may implement different RATs.

[0131] Figure 7 is a block diagram of an exemplary TRP 700 according to some aspects of the present disclosure. The TRP 700 may be as described above in Figure 1 BS 105 in network 100 discussed in or as described above in Figure 2 As shown, TRP 700 may include a processor 702, a memory 704, a PMI module 708, a transceiver 710 including a modem 712 and an RF unit 714, and one or more antennas 716. These elements may communicate with each other directly or indirectly, for example, via one or more buses.

[0132] The processor 702 may have various features as a special-purpose type of processor. For example, these may include a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 702 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration.

[0133] The memory 704 may include cache memory (e.g., cache memory of the processor 702), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, solid-state memory devices, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some aspects, the memory 704 may include non-transitory computer-readable media. The memory 704 may store instructions 706. The instructions 706 may include: when executed by the processor 702, cause the processor 702 to perform the operations described herein (e.g., Figure 1-Figure 4 , Figure 8-Figure 9 and Fig.11 Instructions 706 may also be referred to as code, which may be broadly interpreted as including any type of computer-readable statements, such as those described above. Figure 5 discussed.

[0134] The PMI module 708 may be implemented via hardware, software, or a combination thereof. For example, the PMI module 708 may be implemented as a processor, circuit, and / or instructions 706 stored in the memory 704 and executed by the processor 702. In some cases, the PMI module 708 may be integrated within the modem 712. For example, the PMI module 708 may be implemented by a combination of software components (e.g., executed by a DSP or general purpose processor) and hardware components (e.g., logic gates and circuits) within the modem 712.

[0135] The PMI module 708 can be used in various aspects of the present disclosure, for example, Figure 1-Figure 4 , Figure 8-Figure 9 and Fig.11 For example, PMI module 708 is configured to: send a configuration, for example, to a UE (such as UE 115, 215, or 500); indicate a precoder size parameter for a plurality of TRPs (e.g., TRPs 210 and 220) including TRP 700; send a first reference signal (e.g., CSI-RS 214); and receive a multi-TRP CSI report (e.g., report 230), the multi-TRP CSI report including a first feedback component based on the first reference signal for TRP 700 and a second feedback component based on the second reference signal for a second TRP in the plurality of TRPs, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0136] In some aspects, the precoder size parameter is associated with a first precoder of the first TRP and a second precoder of the second TRP. In some cases, the first precoder may include a precoding matrix similar to 310W. (1)The second precoder may include a precoding matrix similar to precoding matrix 320W. (2) The precoding matrix is ​​as mentioned above. Figure 3 In some other cases, the first precoder may include a precoding matrix similar to 410W. (1) The second precoder may include a precoding matrix similar to precoding matrix 420W. (2) The precoding matrix is ​​as mentioned above. Figure 4 discussed.

[0137] In some aspects, the configuration may indicate a threshold for the number of spatial domain bases that the UE can report for each TRP or a threshold for the combined number of spatial domain bases that the UE can report for all TRPs. Additionally or alternatively, the configuration may indicate a threshold for the number of frequency domain bases that the UE can report for each TRP or a threshold for the combined number of frequency domain bases that the UE can report for all TRPs. Additionally or alternatively, the configuration may indicate a threshold for the number of precoding matrix coefficients that the UE can report for each TRP or a threshold for the combined number of precoding matrix coefficients that the UE can report for all TRPs. Additionally or alternatively, the configuration may indicate a threshold for the number of per-coefficient quantization bits that the UE can use for each TRP or a threshold for the combined number of per-coefficient quantization bits that the UE can use for all TRPs. Mechanisms for configuring sidelink UEs for channel access in shared radio frequency bands and / or unlicensed bands are described in more detail herein.

[0138] As shown, the transceiver 710 may include a modem 712 and an RF unit 714. The transceiver 710 may be configured to communicate bidirectionally with other devices (such as UE 115 and / or 500 and / or another core network element). The modem 712 may be configured to modulate and / or encode data according to an MCS (e.g., an LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a polar coding scheme, a digital beamforming scheme, etc.). The RF unit 714 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) modulated / encoded data (e.g., CSI-RS, CSI-RS report configuration, CSI-RS resource configuration, UL communication signal, PUSCH signal) from the modem 712 (for outward transmission) or modulated / encoded data transmitted from another source (such as UE 115 and / or UE 500). The RF unit 714 may also be configured to perform analog beamforming in conjunction with digital beamforming. Although shown as integrated together in transceiver 710, modem 712 and / or RF unit 714 may be separate devices that are coupled together at BS 105 to enable BS 105 to communicate with other devices.

[0139] The RF unit 714 may provide modulated and / or processed data (e.g., data packets (or more generally, data messages that may include one or more data packets and other information)) to the antenna 716 for transmission to one or more other devices. According to some aspects of the present disclosure, this may include, for example, sending information to complete attachment to a network and communication with a resident UE 115 or 500. The antenna 716 may also receive data messages sent from other devices and may provide the received data messages for processing and / or demodulation at the transceiver 710. The transceiver 710 may provide the demodulated and decoded data (e.g., CSI-RS reports, multi-TRP CSI reports, PMI feedback) to the PMI module 708 for processing. The antenna 716 may include multiple antennas of similar design or different designs to maintain multiple transmission links.

[0140] In an aspect, the transceiver 710 may coordinate with the PMI module 708 to transmit a configuration indicating a precoder size parameter for a plurality of TRPs including the TRP 700. The transceiver 710 is further configured to transmit a first reference signal. The transceiver 710 may also coordinate with the PMI module 708 to receive a CSI report including a first feedback component based on the first reference signal and a second feedback component based on a second reference signal for a second TRP in the plurality of TRPs, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

[0141] In one aspect, the TRP 700 may include multiple transceivers 710 that implement different RATs (e.g., NR and LTE). In one aspect, the TRP 700 may include a single transceiver 710 that implements multiple RATs (e.g., NR and LTE). In one aspect, the transceiver 710 may include various components, where different combinations of components may implement different RATs.

[0142] Combination Fig. 9 Let's discuss Figure 8 , to illustrate the multi-TRP CSI reporting mechanism for high-resolution PMI feedback. Figure 8 800 is a signaling diagram illustrating a multi-TRP CSI reporting method 800 according to some aspects of the present disclosure. The method 800 may be implemented between a UE 808 (e.g., UE 115, 215, and / or 400) and two TRPs 804 and 806 (e.g., TRPs 210, 220, and / or 700) located in a network 802. The UE 808, TRP 804, and TRP 806 may correspond to UE 215, TRP 210, and TRP 220, respectively. The method 800 may employ the methods described above with respect to Figure 3-Figure 7 A similar multi-CSI reporting mechanism as described above can be reused as described above with respect to Figure 3-Figure 7 The same parameters described are represented. As shown, method 800 includes multiple enumerated steps, but embodiments of method 800 may include additional steps before, after, and between the enumerated steps. In some embodiments, one or more of the enumerated steps may be omitted or performed in a different order.

[0143] At action 810, TRP 806 sends a multi-TRP CSI reporting configuration to UE 808, for example, via RRC signaling. The multi-TRP CSI reporting configuration may be used to generate a similar Figure 2 In some cases, TRP 804 and TRP 806 can be coupled to a BS (e.g., BS 105, 205, and / or 600) in network 802, and the BS can configure TRP 806 to send a CSI report configuration. In some other cases, TRP 806 can be similar to a BS (e.g., BS 105, 205, and / or 600) and can determine a CSI report configuration for UE 808 and send the determined CSI report configuration to UE 808. In some cases, TRP 806 can utilize one or more components (such as processor 702, PMI module 708, transceiver 710, modem 712, and one or more antennas 716) to send the CSI report configuration.

[0144] The multi-TRP CSI reporting configuration may include one or more precoder size parameters for TRP 804 and TRP 806. The one or more precoder size parameters may be associated with a first precoder for TRP 804 and a second precoder for second TRP 806. The first precoder and the second precoder may be based on a type II CSI codebook described in 3GPP document TS 38.214 Release 15 or Release 16. For example, the first precoder may include a precoding matrix similar to 310W. (2) The second precoder may include a precoding matrix similar to precoding matrix 320W. (2) The precoding matrix is ​​as mentioned above. Figure 3 Alternatively, the first precoder may include a precoding matrix similar to 410W. (1) The second precoder may include a precoding matrix similar to precoding matrix 420W. (2) The precoding matrix is ​​as mentioned above. Figure 4 discussed.

[0145] In some aspects, the first precoder may include a wideband precoding matrix similar to The second precoder may include a first wideband precoding matrix similar to the wideband precoding matrix The one or more precoder size parameters may be related to the number of spatial domain bases (eg, spatial domain bases b) in the first wideband precoding matrix of TRP 804. i ) and the number of spatial domain bases in the second precoding matrix of TRP 806. In some cases, one or more precoder size parameters may indicate the total number of spatial domain bases across all TRPs to be included in a multi-TRP CSI report (e.g., Report 230). For example, one or more precoder size parameters may indicate the total number of spatial domain bases (e.g., L ) to be reported for precoding at TRP 804 and TRP 806. total ) (e.g., as shown in configuration 330). In some cases, one or more precoder size parameters may indicate the number of spatial domain bases for each TRP to be included in the multi-TRPCSI report. For example, one or more precoder size parameters may indicate the number of spatial domain bases to be reported for precoding at TRP 804 (e.g., L (1) ) and the number of spatial domain bases to be reported for precoding at TRP 806 (e.g., L (2) ) (e.g., as shown in configuration 340).

[0146] In some aspects, the first precoder may include a frequency compression matrix similar to The first frequency compression matrix and similar coefficient matrix 416C (2) The first coefficient matrix of Figure 4 The second precoder may include a frequency compression matrix similar to The second frequency compression matrix and similar coefficient matrix 426C (2) The second coefficient matrix of Figure 4 In some aspects, one or more precoder size parameters may be associated with the number of frequency domain bases in the first frequency compression matrix at TRP 804 and the number of frequency domain bases in the second frequency compression matrix at TRP 806. In some cases, the one or more precoder size parameters may indicate the total number of frequency domain bases across all TRPs to be included in the multi-TRP CSI report. For example, the one or more precoder size parameters may indicate the total number of frequency domain bases to be reported for precoding at TRP 804 and TRP 806 (e.g., M total ) (e.g., as shown in configuration 432). In some cases, one or more precoder size parameters may indicate the number of frequency domain bases for each TRP to be included in the multi-TRP CSI report. For example, one or more precoder size parameters may indicate the number of spatial domain bases to be reported for precoding at TRP 804 (e.g., M (1) ) and the number of spatial domain bases to be reported for precoding at TRP 806 (e.g., < (2) )(e.g., as shown in configuration 442).

[0147] In some aspects, one or more precoder size parameters may be associated with controlling the number of matrix coefficients (e.g., non-zero coefficients in the first coefficient matrix and non-zero coefficients in the second coefficient matrix) to be reported for precoding at TRP 804 and TRP 806 (e.g., as described above with respect to Figure 4 (6) and (7) discussed above). In some cases, one or more precoder size parameters may indicate a common parameter for controlling the number of coefficients for each TRP to be included in the multi-TRP CSI report. For example, one or more precoder size parameters may indicate a common parameter (e.g., β) for controlling the number of matrix coefficients to be reported for precoding at TRP 804 and for controlling the number of matrix coefficients to be reported for precoding at TRP 806 (e.g., as shown in configuration 434). common). In some cases, the one or more precoder size parameters may indicate a separate parameter for controlling the number of matrix coefficients to be reported for precoding at each TRP. For example, the one or more precoder size parameters may indicate a first parameter (e.g., β ) for controlling the number of matrix coefficients to be reported for precoding at TRP 804. (1) ) and a second parameter (e.g., β ) for controlling the number of matrix coefficients to be reported for precoding at TRP 806. (2) )(e.g., as shown in configuration 444).

[0148] In some aspects, one or more precoder size parameters may be associated with quantization levels used to quantize coefficients (e.g., non-zero coefficients) in a first coefficient matrix to be reported for precoding at TRP 804 and coefficients (e.g., non-zero coefficients) in a second coefficient matrix to be reported for precoding at TRP 806. In some cases, one or more precoder size parameters may indicate a total number of quantization levels or a total number of quantization bits used to report matrix coefficients for all TRPs. For example, one or more precoder size parameters may indicate a total number of quantization bits (e.g., Q bits) used to quantize each non-zero-valued matrix coefficient in a first precoder at TRP 804 and a vector of each non-zero-valued matrix coefficient in a second precoder at TRP 806. total )(e.g., as shown in configuration 436). In some cases, one or more precoder size parameters may indicate the number of quantization bits used to quantize each matrix coefficient to be reported for precoding at each TRP. For example, one or more precoder size parameters may indicate the number of quantization bits (e.g., Q (1) ) and the number of quantization bits used for TRP806 (e.g., Q (2) )(e.g., as shown in configuration 446).

[0149] At action 820, TRP 804 transmits one or more first CSI-RS (e.g., CSI-RS 214). TRP 804 may transmit one or more first CSI-RS in one or more beam directions (e.g., beam 212). Each first CSI-RS may include a predetermined sequence or a predetermined set of pilot symbols at a predetermined time and frequency position. In some cases, TRP 804 may utilize one or more components (such as processor 702, PMI module 708, transceiver 710, modem 712, and one or more antennas 716) to transmit one or more first CSI-RS.

[0150] At action 830, TRP 806 transmits one or more second CSI-RS (e.g., CSI-RS 224). TRP 806 may transmit one or more first CSI-RS in one or more beam directions (e.g., beam 222). Each second CSI-RS may include a predetermined sequence or a predetermined set of pilot symbols at a predetermined time and frequency position. In some cases, the second CSI-RS may be the same as the first CSI-RSs. For example, the second CSI-RS and the first CSI-RS may include the same sequence. In some other cases, the second CSI-RS may be different from the first CSI-RS. For example, the second CSI-RS and the first CSI-RS may include different sequences. In some cases, TRP 806 may utilize one or more components (such as processor 702, PMI module 708, transceiver 710, modem 712, and one or more antennas 716) to transmit one or more second CSI-RS.

[0151] At action 840, UE 808 determines a first PMI (eg, Fig. 9 806), and determining a second PMI for TRP 806 based on one or more second CSI-RSs and a multi-TRP CSI reporting configuration (e.g., Fig. 9 In some cases, UE 808 may utilize one or more components (such as processor 502, PMI module 508, transceiver 510, modem 512, and one or more antennas 516) to determine a first PMI for TRP 804 and a second PMI for TRP 806, as will be described in Fig. 9 Further discussed in .

[0152] Fig. 9900 is a flowchart of a multi-TRP CSI reporting method 900 according to some aspects of the present disclosure. Various aspects of method 900 may be performed by a computing device (e.g., a processor, a processing circuit, and / or other appropriate components) of a wireless communication device or other appropriate units for performing steps. For example, a wireless communication device (such as UE 115, 215, 500, and / or 802) may utilize one or more components (such as a processor 502, a memory 504, a PMI module 508, a transceiver 510, a modem 512, and one or more antennas 516) to perform the steps of method 900. Method 900 may be implemented in conjunction with method 800. For example, UE 808 may implement method 900 at action 840 of method 800. As shown, method 900 includes multiple enumerated steps, but various aspects of method 900 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order. Method 900 is illustrated using the same parameter representation as described above in method 800. Although in the context of determining the PMI for a precoder (similar to Figure 4 The method 900 is described with reference to the precoding matrices 410 and 420 shown in FIG. 1 , but similar mechanisms may be applied to determine the precoding matrices used in Figure 3 The PMIs of the precoding matrices 310 and 320 shown in FIG.

[0153] At block 910, UE 808 identifies a plurality of precoder size parameters, e.g., including L (1) , L (2) 、M (1) 、M (1) , β (1) , β (2) , Q (1) and Q (2) As discussed above, a multi-TRP CSI reporting configuration may include a configuration similar to that described above with reference to Figure 4 Various configurations of configurations 330, 432, 436, 446, 340, 442, 444, and 446 are discussed. For example, a multi-TRP CSI reporting configuration may indicate a per-TRP precoder size parameter (e.g., L (1) , L (2) 、M (1) 、M (1) , β (2) , β (2) , Q (1) and Q (2) ). Therefore, UE 808 can identify L from the multi-TRP CSI reporting configuration. (1) , L (2) 、M(2) 、M (1) , β (1) , β (2) , Q (1) and Q (2) Alternatively, the multi-TRP CSI reporting configuration may indicate a threshold precoder size parameter and / or a common precoder size parameter (eg, L total 、M total , β common and / or Q total ). For example, when the multi-TRP CSI reporting configuration indicates the total number of spatial domain bases (e.g., L ) to be reported for precoding at TRP 804 and TRP 806 total ), UE 808 may calculate the total number of spatial domain bases L total To determine the L for TRP 804 (1) and L for TRP 806 (2) In some cases, UE 808 may configure L with the same value. (1) and L (2) (For example, by total In some other cases, UE 808 may configure L with different values. (1) and L (2) , for example based on the total number of TRPs to be reported for multiple CSIPMIs.

[0154] When the multi-TRP CSI reporting configuration indicates the total number of frequency domain bases to be reported for precoding at TRP 804 and TRP 806 (e.g., < total ), UE 808 may be based on the total number of spatial domain bases < total To determine the < (1) and for TRP 806< (2) In some cases, UE 808 may configure < (1) and (2) (For example, by total In some other cases, the UE 808 may configure M with different values. (1) and M (2) , for example based on the total number of TRPs to be reported for multiple CSIPMIs.

[0155] When the multi-TRP CSI reporting configuration indicates a common parameter (e.g., β) for controlling the number of coefficients to be reported for precoding at TRP 804 and TRP 806, common ), UE 808 may(1) and β (2) Set to beta common , and determines the number of coefficients to be reported for TRP 804 as shown in equation (6) and the number of coefficients to be reported for TRP 806 as shown in equation (7). In some aspects, UE 808 may adjust the number of coefficients for TRP 804 and the number of coefficients for TRP 806 based on the number of spatial layers used for communication with TRP 804 and TRP 806.

[0156] When the multi-TRP CSI reporting configuration indicates the total number of quantization bits (e.g., Q total ), UE 808 may calculate the total number of quantization bits Q based on total To determine the Q for TRP 804 (1) and Q for TRP 806 (2) In some cases, UE 808 may configure Q (1) and Q (2) (For example, by total In some other cases, the UE 808 may configure Q with different values. (1) and Q (5) As an example, Q total may have a value of 7, and UE 808 may set Q (1) Set to 4 and set Q (2) is set to 3. In other words, the UE 808 may utilize 4 bits (eg, 8 quantization levels) to quantize the first coefficient matrix (eg, coefficient matrix 416C) for the TRP 804 discussed above at 810. (1) ) is quantized, and 3 bits may be used to quantize the second coefficient matrix (e.g., coefficient matrix 416C) for TRP 804 discussed above at 810. (1) ) is quantized for each non-zero coefficient in . In another example, UE 808 may determine different quantization levels for the phase coefficient and the amplitude coefficient. Referring to the same example, where Q total may have a value of 7, UE 808 may set Q (1) Set to 4 and set Q (2)is set to 3. The UE 808 may also use 5 bits to quantize the amplitude coefficients in the first coefficient matrix for TRP 804, and may use 3 bits to quantize the phase coefficients in the first coefficient matrix (assuming that the number of amplitude coefficients and the number of phase coefficients are approximately the same, so that the average number of quantization bits per coefficient is approximately 4). Similarly, the UE 808 may also use 4 bits to quantize the amplitude coefficients in the second coefficient matrix for TRP 806, and may use 2 bits to quantize the phase coefficients in the second coefficient matrix (assuming that the number of amplitude coefficients and the number of phase coefficients are approximately the same, so that the average number of quantization bits per coefficient is approximately 3). In general, the UE 808 may allocate Q between the amplitude coefficients and the phase coefficients of the coefficient matrices across the TRPs in any suitable manner. total bits.

[0157] At block 920, UE 808 receives the Figure 8 The one or more first CSI-RSs received at action 820 are measured from Select L from a spatial domain basis (e.g., an oversampled DFT beam (1) A spatial domain basis.

[0158] At block 922, UE 808 receives the Figure 8 The one or more second CSI-RSs received at action 820 are measured from Select M from the frequency domain basis (1) A frequency domain basis.

[0159] At block 924, UE 808 receives the L (1) 、M (1) and β (1) To determine the coefficient bitmap. For example, UE 808 may generate a coefficient bitmap having a size of 2×L (1) ×M (1) 804 (e.g., coefficient matrix 416C). (1) ). For example, each bit in the bitmap may correspond to a position of a coefficient in the coefficient matrix. The bitmap may be configured in any configuration in which each bit has a one-to-one correspondence with a position (e.g., in the i-th column and j-th row) of a matrix element (e.g., coefficient) in the first coefficient matrix. For example, the bitmap may be a two-dimensional (2D) bitmap having the same dimensions as the first coefficient matrix. In some other cases, the bitmap may be a one-dimensional (1D) bitmap. The UE 808 may calculate 2×L as shown in Equation (6). (1) ×M (1) ×β (1)804 to determine the number of coefficients (e.g., non-zero values) in the coefficient matrix to be reported for TRP 804. UE 808 may configure a bitmap to indicate the positions of non-zero-valued coefficients in the first coefficient matrix. For example, UE 808 may set bits within the bitmap to a value of 1 to indicate non-zero-valued coefficients in corresponding positions within the coefficient matrix. Conversely, UE 808 may set bits within the bitmap to a value of 0 to indicate coefficients (e.g., values ​​0 or values ​​close to 0) in corresponding positions within the coefficient matrix that are not reported.

[0160] At block 926, UE 808 uses Q (1) number of bits to quantize each non-zero-valued coefficient to be reported in the first coefficient matrix.

[0161] At block 928, UE 808 generates a first PMI feedback component 940, which includes an indication of L (1) The first codeword 942 of the selected space domain basis indicates M (1) The first matrix of coefficients may include a second codeword 944 for a selected spatial domain basis, a quantized coefficient (eg, coefficient 946), and a bitmap (eg, bitmap 948) indicating the position of the quantized coefficient within the first coefficient matrix.

[0162] UE 808 may determine a second PMI feedback component 950 by performing operations shown at 930, 932, 934, 936, and 938, wherein the operations at 930, 932, 934, 936, and 938 include features similar to the operations at 920, 922, 924, 926, and 928, respectively. Therefore, for the sake of brevity, the details of these operations will not be repeated here. As shown, the second PMI feedback component 950 may include an indication of L (2) The first codeword 952 of the selected space domain basis indicates M (2) The second codeword 954 for the selected spatial domain basis, the quantized coefficients (eg, coefficients 956), and a bitmap (eg, bitmap 958) indicating the positions of the quantized coefficients 956 within the second coefficient matrix.

[0163] In some aspects, the overhead (e.g., codeword 942 or 952) indicating the spatial domain basis selection in the PMI report may be represented as follows:

[0164]

[0165] Among them, O sd represents the number of overhead bits used to indicate the spatial domain basis selection, and represents the selection of L spatial domain bases among the (N1×N2) oversampled DFT beams. L may correspond to L for codeword 942. (1)and may correspond to L for codeword 952 (2) .

[0166] The overhead indicating the frequency domain basis selection (e.g., codeword 944) in the PMI report may be represented as follows:

[0167]

[0168] Among them, O fd represents the number of overhead bits used to indicate the frequency domain basis selection, and represents the selection of M space domain bases from among the N3 DFT codebook bases. M may correspond to the M for codeword 944. (1) , and may correspond to M for codeword 954 (2) .

[0169] The overhead for indicating the locations of non-zero coefficients (e.g., bitmap 948 and coefficient 946) in a PMI report may be represented as follows:

[0170] O coef =2×L×M+K0×Q (10) where O coef represents the number of overhead bits used to indicate non-zero coefficients, which may include a bitmap 948 having a size (2×L×M) and a total number of bits used to represent all non-zero coefficients (e.g., the number of non-zero coefficients K0×quantization bits per coefficient Q). Q may correspond to Q for coefficient 946. (1) , and may correspond to a Q for coefficient 956 (2) Therefore, the total per-TRP PMI overhead can be expressed as ( sd +O fd +O coeff ).

[0171] Return to Figure 8 At 850, UE 808 sends a multi-TRP CSI report (e.g., report 230) to TRP 806. The multi-TRP CSI report may include a first PMI for TRP 804 (e.g., first PMI feedback component 940) and a second PMI for TRP 806 (e.g., second PMI feedback component 950). In some cases, UE 808 may utilize one or more components (such as processor 502, PMI module 508, transceiver 510, modem 512, and one or more antennas 516) to send the multi-TRP CSI report. The combined payload size of the first PMI and the second PMI for the multi-TRP CSI report may be based on a precoder size parameter, as described above with respect to Fig. 9 This is shown in equations (8) to (10) discussed above.

[0172] At act 860, upon receiving the multi-TRP CSI report, TRP 806 may send the first PMI to TRP 804. In some cases, TRP 806 may utilize one or more components, such as processor 702, PMI module 708, transceiver 710, modem 712, and one or more antennas 716, to send the first PMI to TRP 804. In some cases, TRP 806 may utilize one or more components, such as processor 702, PMI module 708, transceiver 710, modem 712, and one or more antennas 716, to send the first PMI to a BS (e.g., BS 105, 205, and / or 600) coupled to TRP 804 and TRP 806, and the BS may configure TRP 804 with the first PMI.

[0173] At action 870, TRP 804 may send a first UL communication signal (e.g., a PUSCH signal) to UE 808. TRP 804 may generate the first UL communication using a first precoder generated based on the first PMI. In some cases, the first precoder may include a signal similar to Figure 3 Precoding matrix 310W (1) In some other cases, the first precoder may include a precoding matrix similar to Figure 4 Precoding matrix 410W (1) 948 and the first coefficient 946. For example, the TRP 804 may generate a first wideband matrix based on the codeword 942, a first coefficient matrix based on the bitmap 948 and the first coefficient 946, and a first frequency compression matrix based on the codeword 944. The TRP 804 may apply the generated first wideband matrix, the first coefficient matrix, and the first frequency compression matrix to generate a first UL communication signal. In some cases, the TRP 804 may utilize one or more components (such as the processor 702, the PMI module 708, the transceiver 710, the modem 712, and one or more antennas 716) to send the first UL communication signal.

[0174] At action 880, TRP 806 may send a second UL communication signal to UE 808. TRP 806 may generate the second UL communication using a second precoder generated based on the second PMI. In some cases, the second precoder may include a signal similar to Figure 3 Precoding matrix 320W (2) In some other cases, the second precoder may include a precoding matrix similar to Figure 4 Precoding matrix 420W (2)In some cases, the TRP 806 may utilize one or more components (such as the processor 702, the PMI module 708, the transceiver 710, the modem 712, and one or more antennas 716) to send a second UL communication signal.

[0175] Similarly, when the second PMI corresponds to the second PMI feedback component 950 shown in the method 900, the TRP 806 may generate a second wideband matrix based on the codeword 952, a second coefficient matrix based on the bitmap 958 and the second coefficient 956, and a second frequency compression matrix based on the codeword 954. The TRP 806 may apply the generated second wideband matrix, the second coefficient matrix, and the second frequency compression matrix to generate a second UL communication signal.

[0176] Fig.10 1 is a flow chart of a wireless communication method 1000 according to some aspects of the present disclosure. Aspects of the method 1000 may be performed by a computing device (e.g., a processor, processing circuitry, and / or other appropriate components) of a wireless communication device or other appropriate means for performing steps. For example, a wireless communication device (such as UE 115, 215, and / or 500) may utilize one or more components (such as processor 502, memory 504, PMI module 508, transceiver 510, modem 512, and one or more antennas 516) to perform the steps of the method 1000. The method 1000 may be implemented as described above in Figure 3-Figure 9 As shown, method 1000 includes a plurality of enumerated steps, but aspects of method 1000 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0177] At block 1010, a UE (e.g., UE 115, 215, and / or 500) receives a configuration indicating a precoder size parameter for a plurality of TRPs (e.g., TRPs 210, 220, 700, 804, and / or 806). In some cases, the UE may receive the configuration indicating the precoder size parameter for a plurality of TRPs using one or more components, such as the processor 502, the PMI module 508, the transceiver 510, the modem 512, and the one or more antennas 516.

[0178] In some aspects, the precoder size parameter is associated with a first precoder of the first TRP and a second precoder of the second TRP. In some cases, the first precoder may include a precoding matrix similar to 310W. (1) The second precoder may include a precoding matrix similar to precoding matrix 320W. (2)The precoding matrix is ​​as mentioned above. Figure 3 In some other cases, the first precoder may include a precoding matrix similar to 410W. (1) The second precoder may include a precoding matrix similar to precoding matrix 420W. (2) The precoding matrix is ​​as mentioned above. Figure 4 discussed.

[0179] In some aspects, the precoder size parameter may be associated with at least one of the following: the number of spatial domain components, the number of frequency domain components, a parameter associated with the number of coefficients, or a quantization level for the coefficients. In some cases, the number of spatial domain components may be the total number of spatial domain components for all TRPs (e.g., L total ), as mentioned above in reference Figure 3 and Figure 4 In some other cases, the number of spatial domain components may be the number of spatial domain components per TRP (e.g., L (1) and L (2) ), as mentioned above in reference Figure 3 and Figure 4 In some cases, the number of frequency domain components may be the total number of spatial domain components for all TRPs (e.g., M total ), as mentioned above in reference Figure 4 In some other cases, the number of frequency domain components may be the number of frequency domain components per TRP (e.g., M (1) and M (2) ), as mentioned above in reference Figure 4 In some cases, the parameter associated with the number of coefficients may be a common parameter (e.g., β) used to control the number of coefficients to be reported for all TRPs. common ), as mentioned above in reference Figure 4 In some other cases, the parameter associated with the number of coefficients may be a parameter (e.g., β) for controlling the number of coefficients to be reported for each TRP. (1) and β (2) ), as mentioned above in reference Figure 4 In some cases, the quantization level for a coefficient may be the total number of quantization bits per coefficient for all TRPs (e.g., Q total ), as mentioned above in reference Figure 4 In some other cases, the quantization level for the coefficients may be the number of quantization bits per coefficient per TRP (e.g., Q (1) and Q (2)), as mentioned above in reference Figure 4 Configuration discussed in 446.

[0180] At block 1020, the UE receives a first reference signal (e.g., CSI-RS 214) from a first TRP in the plurality of TRPs. In some cases, the UE may utilize one or more components (such as the processor 502, the PMI module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to receive the first reference signal.

[0181] At block 1030, the UE receives a second reference signal (e.g., CSI-RS 224) from a second TRP in the plurality of TRPs, the second TRP being different from the first TRP. In some cases, the UE may utilize one or more components (such as the processor 502, the PMI module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to receive the second reference signal.

[0182] At block 1040, the UE sends a CSI report (e.g., report 230) to the first TRP or the second TRP, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on a precoder size parameter. In some cases, the UE may utilize one or more components (such as processor 502, PMI module 508, transceiver 510, modem 512, and one or more antennas 516) to send the CSI report.

[0183] In some cases, the first feedback component is associated with a first type IICSI codebook associated with a first TRP, and the second feedback component is associated with a second type IICSI codebook associated with a second TRP.

[0184] Fig.111 is a flow chart of a wireless communication method 1100 according to some aspects of the present disclosure. Aspects of method 1100 may be performed by a computing device (e.g., a processor, a processing circuit, and / or other appropriate components) of a wireless communication device or other appropriate means for performing steps. For example, a wireless communication device (such as BS 105, 205, and / or 600) may utilize one or more components (such as a processor 602, a memory 604, a PMI module 608, a transceiver 610, a modem 612, and one or more antennas 616) to perform the steps of method 1100. Alternatively, a wireless communication device (such as TRP 210, 220, 700, 804, and / or 806) may utilize one or more components (such as a processor 702, a memory 704, a PMI module 708, a transceiver 710, a modem 712, and one or more antennas 716) to perform the steps of method 1100. Method 1100 may be implemented as described above in Figure 3-9 As shown, method 1100 includes a plurality of enumerated steps, but aspects of method 1100 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0185] At block 1110, a BS (e.g., BS 205, 205 and / or 600) sends a configuration indicating a precoder size parameter for a plurality of TRPs (e.g., TRPs 210, 220, 700, 804 and / or 806). In some cases, the BS may receive the configuration indicating the precoder size parameter for a plurality of TRPs using one or more components such as processor 602 or 702, PMI module 608 or 708, transceiver 610 or 710, modem 612 or 712, and one or more antennas 616 or 716.

[0186] In some aspects, the precoder size parameter is associated with a first precoder of the first TRP and a second precoder of the second TRP. In some cases, the first precoder may include a precoding matrix similar to 310W. (1) The second precoder may include a precoding matrix similar to precoding matrix 320W. (2) The precoding matrix is ​​as mentioned above. Figure 3 In some other cases, the first precoder may include a precoding matrix similar to 410W. (1) The second precoder may include a precoding matrix similar to precoding matrix 420W. (2) The precoding matrix is ​​as mentioned above. Figure 4 discussed.

[0187] In some aspects, the precoder size parameter may be associated with at least one of the following: the number of spatial domain components, the number of frequency domain components, a parameter associated with the number of coefficients, or a quantization level for the coefficients. In some cases, the number of spatial domain components may be the total number of spatial domain components for all TRPs (e.g., L total ), as mentioned above in reference Figure 3 and Figure 4 In some other cases, the number of spatial domain components may be the number of spatial domain components per TRP (e.g., L (1) and L (2) ), as mentioned above in reference Figure 3 and Figure 4 In some cases, the number of frequency domain components may be the total number of spatial domain components for all TRPs (e.g., M total ), as mentioned above in reference Figure 4 In some other cases, the number of frequency domain components may be the number of frequency domain components per TRP (e.g., M (1) and M (2) ), as mentioned above in reference Figure 4 In some cases, the parameter associated with the number of coefficients may be a common parameter for controlling the number of coefficients to be reported for all TRPs (e.g., ), as mentioned above in reference Figure 4 In some other cases, the parameter associated with the number of coefficients may be a parameter (e.g., β) for controlling the number of coefficients to be reported for each TRP. (1) and β (2) ), as mentioned above in reference Figure 4 In some cases, the quantization level for a coefficient may be the total number of quantization bits per coefficient for all TRPs (e.g., Q total ), as mentioned above in reference Figure 4 In some other cases, the quantization level for the coefficients may be the number of quantization bits per coefficient per TRP (e.g., Q (1) and Q (2) ), as mentioned above in reference Figure 4 Configuration discussed in 446.

[0188] At block 1120, the BS transmits a first reference signal (e.g., CSI-RS 214) via a first TRP in the plurality of TRPs. In some cases, the BS may receive the first reference signal using one or more components such as the processor 602 or 702, the PMI module 608 or 708, the transceiver 610 or 710, the modem 612 or 712, and one or more antennas 616 or 716.

[0189] At block 1130, the BS transmits a second reference signal (e.g., CSI-RS 224) via a second TRP in the plurality of TRPs, the second TRP being different from the first TRP. In some cases, the BS may receive the second reference signal using one or more components such as a processor 602 or 702, a PMI module 608 or 708, a transceiver 610 or 710, a modem 612 or 712, and one or more antennas 616 or 716.

[0190] At block 1140, the BS receives a CSI report (e.g., report 230) via the first TRP or the second TRP, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on a precoder size parameter. In some cases, the BS may utilize one or more components (such as processor 602 or 702, PMI module 608 or 708, transceiver 610 or 710, modem 612 or 712, and one or more antennas 616 or 716) to send the CSI report.

[0191] In some cases, the first feedback component is associated with a first type IICSI codebook associated with a first TRP, and the second feedback component is associated with a second type IICSI codebook associated with a second TRP.

[0192] Information and signals may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0193] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration).

[0194] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, these functions can be stored as one or more instructions or codes on a computer-readable medium or transmitted on a computer-readable medium. Other examples and implementation methods are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these items. The features used to implement the functions can also be physically located at various locations, including being distributed so that the parts of the functions are implemented at different physical locations. In addition, as used herein (including in the claims), as used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of"), "or" indicates an inclusive list, so that, for example, a list of [at least one of A, B, or C] means: A, or B, or C, or AB, or AC, or BC, or ABC (i.e., A and B and C).

[0195] As those skilled in the art will appreciate by now, and depending on the specific application at hand, many modifications, substitutions and variations may be made in and to the materials, devices, configurations and methods of use of the apparatus of the present disclosure without departing from the spirit and scope of the present disclosure. In view of this, the scope of the present disclosure should not be limited to the scope of the specific embodiments shown and described herein (as they are by way of some examples thereof), but should be fully commensurate with the scope of the claims appended hereto and their functional equivalents.

Claims

1. A method of wireless communication, comprising: Receiving, by a user equipment UE, a configuration indicating a precoder size parameter for a plurality of transmission reception points TRPs, wherein the receiving the configuration comprises: receiving a precoder size parameter associated with a first precoder for a first TRP and a second precoder for a second TRP, and wherein the precoder size parameter is associated with at least one of a number of spatial domain components, a number of frequency domain components, a parameter associated with a number of coefficients, or a quantization level for the coefficients; Receiving, by the UE, a first reference signal from the first TRP among the plurality of TRPs; receiving, by the UE, a second reference signal from the second TRP of the plurality of TRPs, the second TRP being different from the first TRP; and The UE sends a channel state information CSI report to the first TRP or the second TRP, the CSI report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein the combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

2. The method according to claim 1, wherein: At least one of the number of spatial domain components, the number of frequency domain components, the parameter associated with the number of coefficients, or the quantization level used for the coefficients is based on the number of TRPs in the multiple TRPs.

3. The method according to claim 1, further comprising: determining, by the UE, at least one of a first number of spatial domain components for the first precoder or a second number of spatial domain components for the second precoder based on the number of spatial domain components indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the number of the first spatial domain components, or the second feedback component is based on the number of the second spatial domain components.

4. The method according to claim 1, further comprising: determining, by the UE, at least one of a first number of frequency domain components for the first precoder or a second number of frequency domain components for the second precoder based on the number of frequency domain components indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the number of the first frequency domain components, or the second feedback component is based on the number of the second frequency domain components.

5. The method according to claim 1, further comprising: determining, by the UE based on the number of coefficients indicated by the configuration, at least one of a first parameter associated with a first number of coefficients for the first precoder or a second parameter associated with a second number of coefficients for the second precoder, Among them, at least one of the following situations: the first feedback component is based on the first parameter associated with the first number of coefficients, or the second feedback component is based on the second parameter associated with the second number of coefficients.

6. The method according to claim 1, further comprising: determining, by the UE, at least one of a first quantization level for a first coefficient of the first precoder or a second quantization level for a second coefficient of the second precoder based on the quantization level indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the first quantization level used for the first coefficient, or the second feedback component is based on the second quantization level used for the second coefficient.

7. The method according to claim 1, wherein: The receiving the configuration includes receiving the following: a first precoder size parameter associated with the first TRP; and A second precoder size parameter associated with the second TRP.

8. The method according to claim 7, wherein: The receiving the configuration includes receiving the following: said first precoder size parameter comprising a first value; and The second precoder size parameter includes a second value different from the first value.

9. The method according to claim 7, wherein: The receiving the configuration includes receiving the following: the first precoder size parameter associated with a first number of spatial domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of spatial domain components associated with the precoder of the second TRP.

10. The method according to claim 7, wherein: The receiving the configuration includes receiving the following: the first precoder size parameter associated with a first number of frequency domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of frequency domain components associated with the precoder of the second TRP.

11. The method according to claim 7, wherein: The receiving the configuration includes receiving the following: the first precoder size parameter associated with a first number of coefficients associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of coefficients associated with the precoder of the second TRP.

12. The method according to claim 7, wherein: The receiving the configuration includes receiving the following: the first precoder size parameter associated with a first coefficient quantization level associated with a precoder for the first TRP; and The second precoder size parameter associated with the second coefficient quantization level associated with the precoder of the second TRP.

13. The method according to claim 1, wherein: The first feedback component is associated with a first type IICSI codebook associated with the first TRP, and wherein the second feedback component is associated with a second type IICSI codebook associated with the second TRP.

14. A method of wireless communication, comprising: A configuration indicating a precoder size parameter for a plurality of transmit reception points TRPs is sent by a base station BS, wherein the sending of the configuration comprises: sending a precoder size parameter associated with a first precoder for a first TRP and a second precoder for a second TRP, and wherein the precoder size parameter is associated with at least one of the number of spatial domain components, the number of frequency domain components, a parameter associated with the number of coefficients, or a quantization level for the coefficients; Sending, by the BS, a first reference signal via the first TRP among the plurality of TRPs; sending, by the BS, a second reference signal via the second TRP of the plurality of TRPs, the second TRP being different from the first TRP; and A channel state information (CSI) report is received by the BS, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

15. The method according to claim 14, wherein: At least one of the number of spatial domain components, the number of frequency domain components, the parameter associated with the number of coefficients, or the quantization level used for the coefficients is based on the number of TRPs in the multiple TRPs.

16. The method according to claim 14, wherein: The sending of the configuration includes sending the following items: a first precoder size parameter associated with the first TRP; and A second precoder size parameter associated with the second TRP.

17. The method according to claim 16, wherein: The sending of the configuration includes sending the following items: said first precoder size parameter comprising a first value; and The second precoder size parameter includes a second value different from the second TRP.

18. The method according to claim 16, wherein: The sending of the configuration includes sending the following items: the first precoder size parameter associated with a first number of spatial domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of spatial domain components associated with the precoder of the second TRP.

19. The method according to claim 16, wherein: The sending of the configuration includes sending the following items: the first precoder size parameter associated with a first number of frequency domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of frequency domain components associated with the precoder of the second TRP.

20. The method according to claim 16, wherein: The sending of the configuration includes sending the following items: the first precoder size parameter associated with a first number of coefficients associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of coefficients associated with the precoder of the second TRP.

21. The method according to claim 16, wherein: The sending of the configuration includes sending the following items: the first precoder size parameter associated with a first coefficient quantization level associated with a precoder for the first TRP; and The second precoder size parameter associated with the second coefficient quantization level associated with the precoder of the second TRP.

22. The method according to claim 16, wherein: The first feedback component is associated with a first type IICSI codebook associated with the first TRP, and wherein the second feedback component is associated with a second type IICSI codebook associated with the second TRP.

23. A user equipment UE, comprising: A transceiver configured to: Receiving a configuration indicating a precoder size parameter for a plurality of transmit-receive points (TRPs), wherein the transceiver configured to receive the configuration is configured to: receive a precoder size parameter associated with a first precoder for a first TRP and a second precoder for a second TRP, and wherein the precoder size parameter is associated with at least one of a number of spatial domain components, a number of frequency domain components, a parameter associated with a number of coefficients, or a quantization level for the coefficients; receiving a first reference signal from the first TRP of the plurality of TRPs; receiving a second reference signal from the second TRP of the plurality of TRPs, the second TRP being different from the first TRP; and A channel state information (CSI) report is sent to the first TRP or the second TRP, wherein the CSI report includes a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein the combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

24. The UE according to claim 23, wherein: At least one of the number of spatial domain components, the number of frequency domain components, the parameter associated with the number of coefficients, or the quantization level used for the coefficients is based on the number of TRPs in the multiple TRPs.

25. The UE according to claim 23, further comprising: a processor configured to determine at least one of a first number of spatial domain components for the first precoder or a second number of spatial domain components for the second precoder based on the number of spatial domain components indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the number of the first spatial domain components, or the second feedback component is based on the number of the second spatial domain components.

26. The UE according to claim 23, further comprising: a processor configured to determine at least one of a first number of frequency domain components for the first precoder or a second number of frequency domain components for the second precoder based on the number of frequency domain components indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the number of the first frequency domain components, or the second feedback component is based on the number of the second frequency domain components.

27. The UE according to claim 23, further comprising: a processor configured to determine, based on the number of coefficients indicated by the configuration, at least one of a first parameter associated with a first number of coefficients for the first precoder or a second parameter associated with a second number of coefficients for the second precoder, Among them, at least one of the following situations: the first feedback component is based on the first parameter associated with the first number of coefficients, or the second feedback component is based on the second parameter associated with the second number of coefficients.

28. The UE according to claim 23, further comprising: a processor configured to determine at least one of a first quantization level for a first coefficient of the first precoder or a second quantization level for a second coefficient of the second precoder based on the quantization level indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the first quantization level used for the first coefficient, or the second feedback component is based on the second quantization level used for the second coefficient.

29. The UE according to claim 23, wherein: The transceiver configured to receive the configuration is configured to receive: a first precoder size parameter associated with the first TRP; and A second precoder size parameter associated with the second TRP.

30. The UE according to claim 29, wherein: The transceiver configured to receive the configuration is configured to receive: said first precoder size parameter comprising a first value; and The second precoder size parameter includes a second value different from the first value.

31. The UE according to claim 29, wherein: The transceiver configured to receive the configuration is configured to receive: the first precoder size parameter associated with a first number of spatial domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of spatial domain components associated with the precoder of the second TRP.

32. The UE according to claim 29, wherein: The transceiver configured to receive the configuration is configured to receive: the first precoder size parameter associated with a first number of frequency domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of frequency domain components associated with the precoder of the second TRP.

33. The UE according to claim 29, wherein: The transceiver configured to receive the configuration is configured to receive: the first precoder size parameter associated with a first number of coefficients associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of coefficients associated with the precoder of the second TRP.

34. The UE according to claim 29, wherein: The transceiver configured to receive the configuration is configured to receive: the first precoder size parameter associated with a first coefficient quantization level associated with a precoder for the first TRP; and The second precoder size parameter associated with the second coefficient quantization level associated with the precoder of the second TRP.

35. The UE according to claim 23, wherein: The first feedback component is associated with a first type IICSI codebook associated with the first TRP, and wherein the second feedback component is associated with a second type IICSI codebook associated with the second TRP.

36. A base station BS, comprising: A transceiver configured to: sending a configuration indicating a precoder size parameter for a plurality of transmit-receive points (TRPs), wherein the transceiver configured to send the configuration is configured to: send a precoder size parameter associated with a first precoder for a first TRP and a second precoder for a second TRP, and wherein the precoder size parameter is associated with at least one of a number of spatial domain components, a number of frequency domain components, a parameter associated with a number of coefficients, or a quantization level for the coefficients; Sending a first reference signal via the first TRP among the plurality of TRPs; sending a second reference signal via the second TRP of the plurality of TRPs, the second TRP being different from the first TRP; and A channel state information (CSI) report is received, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

37. The BS according to claim 36, wherein: At least one of the number of spatial domain components, the number of frequency domain components, the parameter associated with the number of coefficients, or the quantization level used for the coefficients is based on the number of TRPs in the multiple TRPs.

38. The BS according to claim 36, wherein: The transceiver configured to transmit the configuration is configured to transmit: a first precoder size parameter associated with the first TRP; and A second precoder size parameter associated with the second TRP.

39. The BS according to claim 38, wherein: The transceiver configured to transmit the configuration is configured to transmit: said first precoder size parameter comprising a first value; and The second precoder size parameter includes a second value different from the second TRP.

40. The BS according to claim 38, wherein: The transceiver configured to transmit the configuration is configured to transmit: the first precoder size parameter associated with a first number of spatial domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of spatial domain components associated with the precoder of the second TRP.

41. The BS according to claim 38, wherein: The transceiver configured to transmit the configuration is configured to transmit: the first precoder size parameter associated with a first number of frequency domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of frequency domain components associated with the precoder of the second TRP.

42. The BS according to claim 38, wherein: The transceiver configured to transmit the configuration is configured to transmit: the first precoder size parameter associated with a first number of coefficients associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of coefficients associated with the precoder of the second TRP.

43. The BS according to claim 38, wherein: The transceiver configured to transmit the configuration is configured to transmit: the first precoder size parameter associated with a first coefficient quantization level associated with a precoder for the first TRP; and The second precoder size parameter associated with the second coefficient quantization level associated with the precoder of the second TRP.

44. The BS according to claim 38, wherein: The first feedback component is associated with a first type IICSI codebook associated with the first TRP, and wherein the second feedback component is associated with a second type IICSI codebook associated with the second TRP.

45. A non-transitory computer readable medium having program code recorded thereon, the program code comprising: Code for causing a user equipment (UE) to receive a configuration indicating a precoder size parameter for a plurality of transmission reception points (TRPs), wherein the code for causing the UE to receive the configuration is configured to: receive a precoder size parameter associated with a first precoder for a first TRP and a second precoder for a second TRP, and wherein the precoder size parameter is associated with at least one of the number of spatial domain components, the number of frequency domain components, a parameter associated with the number of coefficients, or a quantization level for the coefficients; code for causing the UE to receive a first reference signal from the first TRP among the plurality of TRPs; code for causing the UE to receive a second reference signal from the second TRP of the plurality of TRPs, the second TRP being different from the first TRP; and Code for causing the UE to send a channel state information (CSI) report to the first TRP or the second TRP, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

46. ​​The non-transitory computer readable medium of claim 45, wherein: At least one of the number of spatial domain components, the number of frequency domain components, the parameter associated with the number of coefficients, or the quantization level used for the coefficients is based on the number of TRPs in the multiple TRPs.

47. The non-transitory computer readable medium of claim 45, further comprising: code for causing the UE to determine at least one of a first number of spatial domain components for the first precoder or a second number of spatial domain components for the second precoder based on the number of spatial domain components indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the number of the first spatial domain components, or the second feedback component is based on the number of the second spatial domain components.

48. The non-transitory computer readable medium of claim 45, further comprising: code for causing the UE to determine at least one of a first number of frequency domain components for the first precoder or a second number of frequency domain components for the second precoder based on the number of frequency domain components indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the number of the first frequency domain components, or the second feedback component is based on the number of the second frequency domain components.

49. The non-transitory computer readable medium of claim 45, further comprising: code for causing the UE to determine at least one of a first parameter associated with a first number of coefficients for the first precoder or a second parameter associated with a second number of coefficients for the second precoder based on the number of coefficients indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the first parameter associated with the first number of coefficients, or the second feedback component is based on the second parameter associated with the second number of coefficients.

50. The non-transitory computer readable medium of claim 45, further comprising: code for causing the UE to determine at least one of a first quantization level for first coefficients of the first precoder or a second quantization level for second coefficients of the second precoder based on the quantization level indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the first quantization level used for the first coefficient, or the second feedback component is based on the second quantization level used for the second coefficient.

51. The non-transitory computer readable medium of claim 45, wherein: The code for causing the UE to receive the configuration is configured to receive the following: a first precoder size parameter associated with the first TRP; and A second precoder size parameter associated with the second TRP.

52. The non-transitory computer readable medium of claim 51, wherein: The code for causing the UE to receive the configuration is configured to receive the following: said first precoder size parameter comprising a first value; and The second precoder size parameter includes a second value different from the first value.

53. The non-transitory computer readable medium of claim 51, wherein: The code for causing the UE to receive the configuration is configured to receive the following: the first precoder size parameter associated with a first number of spatial domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of spatial domain components associated with the precoder of the second TRP.

54. The non-transitory computer readable medium of claim 51, wherein: The code for causing the UE to receive the configuration is configured to receive the following: the first precoder size parameter associated with a first number of frequency domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of frequency domain components associated with the precoder of the second TRP.

55. The non-transitory computer readable medium of claim 51, wherein: The code for causing the UE to receive the configuration is configured to receive the following: the first precoder size parameter associated with a first number of coefficients associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of coefficients associated with the precoder of the second TRP.

56. The non-transitory computer readable medium of claim 51, wherein: The code for causing the UE to receive the configuration is configured to receive the following: the first precoder size parameter associated with a first coefficient quantization level associated with a precoder for the first TRP; and The second precoder size parameter associated with the second coefficient quantization level associated with the precoder of the second TRP.

57. The non-transitory computer readable medium of claim 45, wherein: The first feedback component is associated with a first type IICSI codebook associated with the first TRP, and wherein the second feedback component is associated with a second type IICSI codebook associated with the second TRP.

58. A non-transitory computer readable medium having program code recorded thereon, the program code comprising: A code for causing a base station BS to send a configuration indicating a precoder size parameter for a plurality of transmission reception points TRPs, wherein the code for causing the BS to send the configuration is configured to: send a precoder size parameter associated with a first precoder for a first TRP and a second precoder for a second TRP, and wherein the precoder size parameter is associated with at least one of the number of spatial domain components, the number of frequency domain components, a parameter associated with the number of coefficients, or a quantization level for the coefficients; code for causing the BS to transmit a first reference signal via the first TRP of the plurality of TRPs; code for causing the BS to transmit a second reference signal via the second TRP of the plurality of TRPs, the second TRP being different from the first TRP; and Code for causing the BS to receive a channel state information (CSI) report, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

59. The non-transitory computer readable medium of claim 58, wherein: At least one of the number of spatial domain components, the number of frequency domain components, the parameter associated with the number of coefficients, or the quantization level used for the coefficients is based on the number of TRPs in the multiple TRPs.

60. The non-transitory computer readable medium of claim 58, wherein: The code for causing the BS to send the configuration is configured to send: a first precoder size parameter associated with the first TRP; and A second precoder size parameter associated with the second TRP.

61. The non-transitory computer readable medium of claim 60, wherein: The code for causing the BS to send the configuration is configured to send: said first precoder size parameter comprising a first value; and The second precoder size parameter includes a second value different from the second TRP.

62. The non-transitory computer readable medium of claim 60, wherein: The code for causing the BS to send the configuration is configured to send: the first precoder size parameter associated with a first number of spatial domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of spatial domain components associated with the precoder of the second TRP.

63. The non-transitory computer readable medium of claim 60, wherein: The code for causing the BS to send the configuration is configured to send: the first precoder size parameter associated with a first number of frequency domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of frequency domain components associated with the precoder of the second TRP.

64. The non-transitory computer readable medium of claim 60, wherein: The code for causing the BS to send the configuration is configured to send: the first precoder size parameter associated with a first number of coefficients associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of coefficients associated with the precoder of the second TRP.

65. The non-transitory computer readable medium of claim 60, wherein: The code for causing the BS to send the configuration is configured to send: the first precoder size parameter associated with a first coefficient quantization level associated with a precoder for the first TRP; and The second precoder size parameter associated with the second coefficient quantization level associated with the precoder of the second TRP.

66. The non-transitory computer readable medium of claim 60, wherein: The first feedback component is associated with a first type IICSI codebook associated with the first TRP, and wherein the second feedback component is associated with a second type IICSI codebook associated with the second TRP.

67. A user equipment UE, comprising: means for receiving a configuration indicating a precoder size parameter for a plurality of transmission-reception points (TRPs), wherein the means for receiving the configuration is configured to: receive a precoder size parameter associated with a first precoder for a first TRP and a second precoder for a second TRP, and wherein the precoder size parameter is associated with at least one of a number of spatial domain components, a number of frequency domain components, a parameter associated with a number of coefficients, or a quantization level for the coefficients; means for receiving a first reference signal from the first TRP of the plurality of TRPs; means for receiving a second reference signal from the second TRP of the plurality of TRPs, the second TRP being different from the first TRP; and A unit for sending a channel state information (CSI) report to the first TRP or the second TRP, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

68. The UE according to claim 67, wherein: At least one of the number of spatial domain components, the number of frequency domain components, the parameter associated with the number of coefficients, or the quantization level used for the coefficients is based on the number of TRPs in the multiple TRPs.

69. The UE according to claim 67, further comprising: means for determining at least one of a first number of spatial domain components for the first precoder or a second number of spatial domain components for the second precoder based on the number of spatial domain components indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the number of the first spatial domain components, or the second feedback component is based on the number of the second spatial domain components.

70. The UE according to claim 67, further comprising: means for determining at least one of a first number of frequency domain components for the first precoder or a second number of frequency domain components for the second precoder based on the number of frequency domain components indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the number of the first frequency domain components, or the second feedback component is based on the number of the second frequency domain components.

71. The UE according to claim 67, further comprising: means for determining at least one of a first parameter associated with a first number of coefficients for the first precoder or a second parameter associated with a second number of coefficients for the second precoder based on the number of coefficients indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the first parameter associated with the first number of coefficients, or the second feedback component is based on the second parameter associated with the second number of coefficients.

72. The UE according to claim 67, further comprising: means for determining at least one of a first quantization level for first coefficients of the first precoder or a second quantization level for second coefficients of the second precoder based on the quantization level indicated by the configuration, Among them, at least one of the following situations: the first feedback component is based on the first quantization level used for the first coefficient, or the second feedback component is based on the second quantization level used for the second coefficient.

73. The UE according to claim 67, wherein: The means for receiving the configuration is configured to receive: a first precoder size parameter associated with the first TRP; and A second precoder size parameter associated with the second TRP.

74. The UE according to claim 73, wherein: The means for receiving the configuration is configured to receive: said first precoder size parameter comprising a first value; and The second precoder size parameter includes a second value different from the first value.

75. The UE according to claim 73, wherein: The means for receiving the configuration is configured to receive: the first precoder size parameter associated with a first number of spatial domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of spatial domain components associated with the precoder of the second TRP.

76. The UE according to claim 73, wherein: The means for receiving the configuration is configured to receive: the first precoder size parameter associated with a first number of frequency domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of frequency domain components associated with the precoder of the second TRP.

77. The UE according to claim 73, wherein: The means for receiving the configuration is configured to receive: the first precoder size parameter associated with a first number of coefficients associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of coefficients associated with the precoder of the second TRP.

78. The UE according to claim 73, wherein: The means for receiving the configuration is configured to receive: the first precoder size parameter associated with a first coefficient quantization level associated with a precoder for the first TRP; and The second precoder size parameter associated with the second coefficient quantization level associated with the precoder of the second TRP.

79. The UE according to claim 67, wherein: The first feedback component is associated with a first type IICSI codebook associated with the first TRP, and wherein the second feedback component is associated with a second type IICSI codebook associated with the second TRP.

80. A base station BS, comprising: means for sending a configuration indicating a precoder size parameter for a plurality of transmission reception points (TRPs), wherein the means for sending the configuration is configured to: send a precoder size parameter associated with a first precoder for a first TRP and a second precoder for a second TRP, and wherein the precoder size parameter is associated with at least one of a number of spatial domain components, a number of frequency domain components, a parameter associated with a number of coefficients, or a quantization level for the coefficients; means for sending a first reference signal via the first TRP of the plurality of TRPs; means for transmitting a second reference signal via the second TRP of the plurality of TRPs, the second TRP being different from the first TRP; and Unit for receiving a channel state information (CSI) report, the CSI report comprising a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, wherein a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.

81. The BS according to claim 80, wherein: At least one of the number of spatial domain components, the number of frequency domain components, the parameter associated with the number of coefficients, or the quantization level used for the coefficients is based on the number of TRPs in the multiple TRPs.

82. The BS according to claim 80, wherein: The means for sending the configuration is configured to send the following: a first precoder size parameter associated with the first TRP; and A second precoder size parameter associated with the second TRP.

83. The BS according to claim 82, wherein: The means for sending the configuration is configured to send the following: said first precoder size parameter comprising a first value; and The second precoder size parameter includes a second value different from the second TRP.

84. The BS according to claim 82, wherein: The means for sending the configuration is configured to send the following: the first precoder size parameter associated with a first number of spatial domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of spatial domain components associated with the precoder of the second TRP.

85. The BS according to claim 82, wherein: The means for sending the configuration is configured to send the following: the first precoder size parameter associated with a first number of frequency domain components associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of frequency domain components associated with the precoder of the second TRP.

86. The BS according to claim 82, wherein: The means for sending the configuration is configured to send the following: the first precoder size parameter associated with a first number of coefficients associated with a precoder for the first TRP; and The second precoder size parameter associated with the second number of coefficients associated with the precoder of the second TRP.

87. The BS according to claim 82, wherein: The means for sending the configuration is configured to send the following: the first precoder size parameter associated with a first coefficient quantization level associated with a precoder for the first TRP; and The second precoder size parameter associated with the second coefficient quantization level associated with the precoder of the second TRP.

88. The BS according to claim 82, wherein: The first feedback component is associated with a first type IICSI codebook associated with the first TRP, and wherein the second feedback component is associated with a second type IICSI codebook associated with the second TRP.

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