Techniques to facilitate parameter combination configuration for type II-CJT CSI

Abstract

In a first configuration, the UE is configured to transmit information indicating a number of SD bases for each TRP in a set of TRP. In addition, the UE is configured to receive downlink communications from at least a subset of the TRPs in the set of TRPs based on the transmitted information. In a second configuration, the UE is configured to receive information indicating a number of SD bases for each TRP in the set of TRP. The received information is not associated with a first parameter indicating a number of FD bases and a second parameter indicating a maximum number of NZCs. In addition, the UE is configured to transmit a CSI report based on the received information.

Description

Technical Field

[0001] The present disclosure relates generally to communication systems, and more particularly to wireless communications employing coherent joint transmission (CJT) across multiple transmit receive points (TRPs). Background Art

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcast. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0003] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT)) and other requirements. 5GNR includes services associated with enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC). Certain aspects of 5G NR may be based on 4G Long Term Evolution (LTE) standards. It is necessary to further improve 5G NR technology. In addition, these improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the invention

[0004] A simplified summary of one or more aspects is presented below to provide a basic understanding of these aspects. This summary is not an extensive review of all contemplated aspects. This summary neither identifies the key or important elements of all aspects, nor describes the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to a more detailed description presented later.

[0005] In one aspect of the present disclosure, methods, computer-readable media, and apparatus for wireless communications are provided. An apparatus may include a user equipment (UE). The example apparatus may send information indicating a number of spatial domain (SD) bases for each TRP in a set of transmit reception points (TRPs). The example apparatus may also receive downlink communications from at least a subset of the TRPs in the set of TRPs based on the information.

[0006] In another aspect of the present disclosure, a method, computer-readable medium, and apparatus for wireless communication are provided. An apparatus may include a UE. The example apparatus may receive information indicating the number of SD bases for each TRP in a set of TRPs, the information not associated with a first parameter indicating the number of frequency domain (FD) bases and a second parameter indicating the maximum number of non-zero coefficients (NZC). The example apparatus may also send a channel state information (CSI) report based on the information.

[0007] To achieve the aforementioned and related purposes, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail some exemplary features of one or more aspects. However, these features indicate only some of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

[0009] Figure 2A is a diagram illustrating an example of a first frame according to various aspects of the present disclosure.

[0010] Figure 2B is a diagram illustrating an example of downlink (DL) channels within a subframe according to various aspects of the present disclosure.

[0011] Figure 2C is a diagram illustrating an example of a second frame according to various aspects of the present disclosure.

[0012] Figure 2D is a diagram illustrating an example of uplink (UL) channels within a subframe according to various aspects of the present disclosure.

[0013] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0014] Figure 4 is a diagram illustrating an example of a wireless communication system including a UE, a first network entity, a second network entity, and multiple TRPs according to various aspects of the present disclosure.

[0015] Figure 5A is a diagram illustrating characteristics of non-coherent joint transmission (NCJT) according to various aspects of the present disclosure.

[0016] Figure 5B is a diagram illustrating characteristics of coherent joint transmission (CJT) according to various aspects of the present disclosure.

[0017] Figure 6is a diagram illustrating components of a precoder matrix in some aspects of wireless communications in accordance with various aspects of the present disclosure.

[0018] Figure 7 is a diagram illustrating a collection of pre-decoder components used in some aspects of CJT according to various aspects of the present disclosure.

[0019] Figure 8 Depicted are tables illustrating different combinations of parameters based on values ​​of parameter combination indicators in accordance with various aspects of the present disclosure.

[0020] Fig. 9 is a diagram illustrating an example of a two-part CSI according to various aspects of the present disclosure.

[0021] Fig.10 An example communication flow between a network entity and a UE according to various aspects of the present disclosure is illustrated.

[0022] Fig.11 A table depicting example scenarios of differences based on TRP selection and SD base number configuration according to various aspects of the present disclosure.

[0023] Fig.12 Depicted is a portion of a table illustrating different combinations of parameters based on values ​​of parameter combination indicators in accordance with various aspects of the present disclosure.

[0024] Fig.13 is a diagram illustrating an example CSI report including a first CSI part and a second CSI part according to various aspects of the present disclosure.

[0025] Fig.14 is a diagram illustrating another example CSI report including a first CSI part and a second CSI part according to various aspects of the present disclosure.

[0026] Fig.15 is a diagram illustrating another example CSI report including a first CSI part and a second CSI part according to various aspects of the present disclosure.

[0027] Fig.16 is a diagram illustrating another example CSI report including a first CSI part and a second CSI part according to various aspects of the present disclosure.

[0028] Fig.17 Portions of a table illustrating different combinations of parameters based on values ​​of parameter combination indicators are depicted in accordance with various aspects of the present disclosure.

[0029] Fig.18 is a diagram illustrating another example CSI report including a first CSI part and a second CSI part according to various aspects of the present disclosure.

[0030] Fig.19 is a flow chart of a method of wireless communication according to various aspects of the present disclosure.

[0031] Fig. 20 is a flow chart of a method of wireless communication according to various aspects of the present disclosure.

[0032] Fig.21 are diagrams illustrating examples of hardware implementations for example devices and / or network entities. DETAILED DESCRIPTION

[0033] In some examples, a wireless communication system may support connectivity for a large number of UEs. Such a wireless communication system may include multiple TRPs to, for example, improve reliability, coverage, and / or capacity. In a multi-TRP communication system, a network entity and a UE may communicate with each other by transmitting communications using one or more of the multiple TRPs.

[0034] A channel state feedback procedure may facilitate channel estimation at the UE. For example, the channel state feedback procedure may include the UE receiving a CSI reference signal (CSI-RS) from a network entity. The UE may generate (or measure) CSI based on, for example, the CSI-RS, and send a CSI report including the CSI to the network entity. In some examples, the network entity may send downlink communications to the UE based on the CSI included in the CSI report. In an example where the network entity and the UE are operating in a multi-TRP communication mode, when executing the channel state feedback procedure, the UE may generate CSI for one or more of the TRPs. Therefore, it can be understood that as the number of TRPs increases, the size of the CSI report will also increase.

[0035] Various aspects disclosed herein provide techniques for improving CSI acquisition for CJT targeting low frequency bands (such as FR1) and up to 4 TRPs. In such scenarios, it can be appreciated that backhaul connectivity between TRPs is desirable and synchronization (e.g., coordination of transmissions) is supported. Additionally, the number of antenna ports across all TRPs may be the same. Thus, various aspects disclosed herein may facilitate providing Type II codebook refinement for CJT in a multi-TRP (mTRP) communication mode targeting FDD and its associated CSI reporting, while also considering the tradeoff between throughput and overhead.

[0036] Aspects disclosed herein facilitate targeting CJT in low frequency bands and achieving a larger number of ports with distributed TRPs / panels. For example, for a single TRP / panel with, for example, 32 ports, the antenna array size may be too large for practical deployment.

[0037] In a first aspect disclosed herein, a UE may send information indicating a number of SD bases for each TRP in a set of TRPs. The UE may indicate the number of SD bases in a CSI part 1 of a CSI report or in a CSI part 2 of a CSI report. The UE may then receive downlink communications from at least a subset of the TRPs in the set of TRPs.

[0038] In a second aspect disclosed herein, a UE may receive information indicating a number of SD bases for each TRP in a set of TRPs. The received information may not be associated with a first parameter indicating a number of FD bases and a second parameter indicating a maximum number of NZCs. The UE may also send a CSI report based on the received information. The UE may include an indication of the selected TRP in a CSI part 1 of the CSI report and an indication of the selection of the SD base per TRP in a CSI part 2 of the CSI report.

[0039] The specific embodiments described below in conjunction with the accompanying drawings are descriptions of various configurations and do not represent the only configurations in which the concepts described herein can be practiced. In order to provide a thorough understanding of the various concepts, the specific embodiments include specific details. However, these concepts can be practiced without these specific details. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0040] Several aspects of telecommunication systems are presented with reference to various apparatus and methods. These apparatus and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0041] As an example, an element, or any part of an element, or any combination of elements, may be implemented as a "processing system", which includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chips (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform various functionalities described throughout the present disclosure. One or more processors in a processing system may execute software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other terms, software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.

[0042] Thus, in one or more example aspects, specific implementations and / or use cases, the described functionality may be implemented in hardware, software, or any combination thereof. If implemented in software, the functionality may be stored or encoded as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media. Storage media may be any available media that can be accessed by a computer. As an example, such computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0043] Although various aspects, specific implementations and / or use cases are described in this application by the illustration of some examples, additional or different aspects, specific implementations and / or use cases may be generated in many different arrangements and scenarios. The various aspects, specific implementations and / or use cases described herein can be implemented across many different platform types, devices, systems, shapes, sizes and packaging arrangements. For example, various aspects, specific implementations and / or use cases can be generated via integrated chip specific implementations and other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / purchase equipment, medical equipment, devices that enable artificial intelligence (AI), etc.). Although some examples may or may not be specifically for use cases or applications, the described examples may have a wide range of applicability. Various aspects, specific implementations and / or use cases may be in the range from chip-level or modular components to non-modular, non-chip-level specific implementations, and further to the range of aggregated, distributed or original equipment manufacturer (OEM) devices or systems in conjunction with one or more technologies herein. In some actual settings, the equipment combined with the various aspects and features described may also include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals necessarily include multiple components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.) The various techniques described herein can be practiced in a wide variety of devices of various sizes, shapes, and configurations, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc.

[0044] The deployment of a communication system (such as a 5G NR system) can be arranged with various components or constituent parts in a variety of ways. In a 5G NR system or network, a network node, a network entity, a mobility element of a network, a radio access network (RAN) node, a core network node, a network element or network equipment (such as a base station (BS)) or one or more units (or one or more components) performing base station functions can be implemented in an aggregated or decomposed architecture. For example, a BS (such as a Node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a transmit receive point (TRP) or a cell, etc.) can be implemented as an aggregated base station (also referred to as an independent BS or a monolithic BS) or a decomposed base station.

[0045] A converged base station may be configured to utilize a radio protocol stack physically or logically integrated within a single RAN node. A decomposed base station may be configured to utilize a protocol stack physically or logically distributed between two or more units, such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs). In some aspects, a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed in one or more other RAN nodes. A DU may be implemented to communicate with one or more RUs. Each of a CU, a DU, and a RU may be implemented as a virtual unit, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0046] Base station operation or network design may take into account the aggregated nature of base station functionality. For example, a disaggregated base station may be used in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (network configuration such as that initiated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)). Decomposition may include distributing functions across two or more units at various physical locations, as well as virtually distributing the functions of at least one unit, which may enable flexibility in network design. Various units of a disaggregated base station or disaggregated RAN architecture may be configured for wired or wireless communication with at least one other unit.

[0047] Figure 1 100 is a diagram illustrating an example of a wireless communication system and an access network. The illustrated wireless communication system includes a disaggregated base station architecture. The disaggregated base station architecture may include one or more CUs (e.g., CU 110), which may communicate directly with a core network 120 via a backhaul link, or indirectly with the core network 120 through one or more disaggregated base station units (such as a near real-time (near RT) RAN intelligent controller (RIC) (e.g., near RT RIC 125) via an E2 link, or a non-real-time (non-RT) RIC 115 associated with a service management and orchestration (SMO) framework (e.g., SMO framework 105), or both. CU 110 may communicate with one or more DUs (e.g., DU 130) via corresponding midhaul links (such as F1 interfaces). DU 130 may communicate with one or more RUs (e.g., RU 140) via corresponding fronthaul links. RU 140 may communicate with corresponding UEs (e.g., UE 104) via one or more radio frequency (RF) access links. In some implementations, UE 104 may be served by multiple RUs simultaneously.

[0048] Each of the units (i.e., CU (e.g., CU 110), DU (e.g., DU 130), RU (e.g., RU 140), and near-RT RIC (e.g., near-RT RIC 125), non-RT RIC (e.g., non-RT RIC 115), and SMO framework 105) may include or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units or an associated processor or controller that provides instructions to the communication interface of these units may be configured to communicate with one or more of the other units via the transmission medium. For example, these units may include a wired interface configured to receive signals or transmit signals to one or more of the other units via the wired transmission medium. Additionally, these units may include a wireless interface that may include a receiver, a transmitter, or a transceiver (such as an RF transceiver) configured to receive and / or transmit signals to one or more of the other units via a wireless transmission medium.

[0049] In some aspects, CU 110 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface that is configured to communicate signals with other control functions hosted by CU 110. CU 110 may be configured to handle user plane functionality (i.e., central unit-user plane (CU-UP)), control plane functionality (i.e., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, CU 110 may be logically divided into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 110 may be implemented to communicate with DU 130 for network control and signaling.

[0050] DU 130 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs. In some aspects, DU 130 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.) at least in part according to functional splits (such as those defined by 3GPP). In some aspects, DU 130 may also host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 130 or with control functions hosted by CU 110.

[0051] Lower layer functionality may be implemented by one or more RUs. In some deployments, the RU 140 controlled by the DU 130 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.) or both based at least in part on functional splitting (such as lower layer functional splitting). In this architecture, the RU 140 may be implemented to handle air (OTA) communications with one or more UEs (e.g., UE 104). In some specific implementations, the real-time and non-real-time aspects of the control plane and user plane communications with the RU 140 may be controlled by the corresponding DU. In some scenarios, this configuration may enable the DU and CU 110 to be implemented in a cloud-based RAN architecture (such as a vRAN architecture).

[0052] The SMO framework 105 may be configured to support RAN deployment and provisioning of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 105 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operation and maintenance interface (such as an o1 interface). For virtualized network elements, the SMO framework 105 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 190) to perform network element lifecycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CUs, DUs, RUs, and near-RT RICs. In some specific implementations, the SMO framework 105 may communicate with hardware aspects of the 4G RAN (such as an open eNB (O-eNB) 111) via the O1 interface. Additionally, in some specific implementations, the SMO framework 105 may communicate directly with one or more RUs via the O1 interface. The SMO framework 105 may also include a non-RT RIC 115 configured to support the functionality of the SMO framework 105 .

[0053] The non-RT RIC 115 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence (AI) / machine learning (ML) (AI / ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 125. The non-RT RIC 115 may be coupled to or in communication with the near-RT RIC 125 (such as via an A1 interface). The near-RT RIC 125 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs, one or more DUs, or both, and the O-eNB with the near-RT RIC 125.

[0054] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 125, the non-RT RIC 115 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 125 and may be received from a non-network data source or from a network function at the SMO framework 105 or the non-RT RIC 115. In some examples, the non-RT RIC 115 or the near-RT RIC 125 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 115 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 105 (such as via reconfiguration of O1) or via the creation of RAN management policies (such as A1 policies).

[0055] At least one of the CU 110, the DU 130, and the RU 140 may be referred to as a base station 102. Therefore, the base station 102 may include one or more of the CU 110, the DU 130, and the RU 140 (each component is indicated by a dotted line to indicate that each component may be included in the base station 102 or may not be included in the base station). The base station 102 provides an access point to the core network 120 for the UE 104. The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). Small cells include femto cells, pico cells, and micro cells. A network including both small cells and macro cells may be referred to as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB), which may provide services to a restricted group referred to as a closed subscriber group (CSG). The communication link between a RU (e.g., RU 140) and a UE (e.g., UE 104) may include an uplink (UL) (also referred to as a reverse link) transmission from UE 104 to RU 140 and / or a downlink (DL) (also referred to as a forward link) transmission from RU 140 to UE 104. The communication link may use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming and / or transmit diversity. The communication link may be through one or more carriers. For each carrier allocated in a carrier aggregation of up to Yx MHz (x component carriers) for transmission in each direction, the base station 102 / UE 104 may use a spectrum of up to Y MHz (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, etc.) bandwidth. These carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL ​​compared to UL). A component carrier may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

[0056] Certain UEs may communicate with each other using device-to-device (D2D) communications (e.g., D2D communication links 158). The D2D communication links 158 may use DL / UL wireless wide area network (WWAN) spectrum. The D2D communication links 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communications may be through a variety of wireless D2D communication systems, such as, for example, Bluetooth, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0057] The wireless communication system may also include a Wi-Fi AP 150 that communicates with a UE 104 (also referred to as a Wi-Fi station (STA)) via a communication link 154, for example, in a 5 GHz unlicensed spectrum, etc. When communicating in an unlicensed spectrum, the UE 104 / Wi-Fi AP 150 may perform a clear channel assessment (CCA) to determine whether a channel is available prior to communication.

[0058] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as the "sub-6 GHz" band in various documents and articles. A similar naming issue sometimes occurs with respect to FR2, which is often (interchangeably) referred to as the "millimeter wave" band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0059] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as frequency range designation FR3 (7.125 GHz–24.25 GHz). The bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, and thus the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operations to more than 52.6 GHz. For example, three higher operating bands have been identified as frequency range designations FR2-2 (52.6 GHz-71 GHz), FR4 (71 GHz-114.25 GHz), and FR5 (114.25 GHz-300 GHz). Each of these higher frequency bands falls within the EHF band.

[0060] In view of the above, unless otherwise specifically stated, if the term "sub-6 GHz" or the like is used herein, it may broadly refer to frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specifically stated, if the term "millimeter wave" or the like is used herein, it may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, FR4, FR2-2, and / or FR5, or may be within the EHF band.

[0061] The base station 102 and the UE 104 may each include multiple antennas (such as antenna elements, antenna panels, and / or antenna arrays) to facilitate beamforming. The base station 102 may send a beamformed signal 182 to the UE 104 in one or more transmit directions. The UE 104 may receive the beamformed signal from the base station 102 in one or more receive directions. The UE 104 may also send a beamformed signal 184 to the base station 102 in one or more transmit directions. The base station 102 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 102 / UE 104 may perform beam training to determine the best receive direction and transmit direction for each of the base station 102 / UE 104. The transmit direction and receive direction of the base station 102 may be the same or may not be the same. The transmit direction and receive direction of the UE 104 may be the same or may not be the same.

[0062] The base station 102 may include and / or be referred to as a gNB, a Node B, an eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit receive point (TRP), a network node, a network entity, a network equipment, or some other suitable term. The base station 102 may be implemented as an integrated access and backhaul (IAB) node, a relay node, a sidelink node, an aggregated (monolithic) base station with a baseband unit (BBU) (including a CU and a DU) and a RU, or as a disaggregated base station including one or more of a CU, a DU, and / or a RU. A set of base stations that may include disaggregated base stations and / or aggregated base stations may be referred to as a next generation (NG) RAN (NG-RAN).

[0063] The core network 120 may include an access and mobility management function (AMF) (e.g., AMF 161), a session management function (SMF) (e.g., SMF 162), a user plane function (UPF) (e.g., UPF 163), a unified data management (UDM) (e.g., UDM 164), one or more location servers 168, and other functional entities. AMF 161 is a control node that handles signaling between UE 104 and the core network 120. AMF 161 supports registration management, connection management, mobility management, and other functions. SMF 162 supports session management and other functions. UPF 163 supports packet routing, packet forwarding, and other functions. UDM 164 supports the generation of authentication and key agreement (AKA) credentials, user identity handling, access authorization, and subscription management. One or more location servers 168 are illustrated as including a gateway mobile location center (GMLC) (e.g., GMLC 165) and a location management function (LMF) (e.g., LMF 166). However, in general, the one or more location servers 168 may include one or more location / positioning servers, which may include one or more of the GMLC 165, the LMF 166, the position determination entity (PDE), the serving mobile location center (SMLC), the mobile positioning center (MPC), etc. The GMLC 165 and the LMF 166 support UE location services. The GMLC 165 provides an interface for clients / applications (e.g., emergency services) to access UE positioning information. The LMF 166 receives measurements and assistance information from the NG-RAN and the UE 104 via the AMF 161 to calculate the location of the UE 104. The NG-RAN may determine the location of the UE 104 using one or more positioning methods. Positioning the UE 104 may involve signal measurements, position estimation, and optional speed calculations based on these measurements. Signal measurements may be performed by the UE 104 and / or a serving base station (e.g., base station 102). The measured signals may be based on a satellite positioning system (SPS) 170 (e.g., one or more of a global navigation satellite system (GNSS), a global positioning system (GPS), a non-terrestrial network (NTN), or other satellite positioning / positioning systems), LTE signals, wireless local area network (WLAN) signals, Bluetooth signals, a terrestrial beacon system (TBS), sensor-based information (e.g., an atmospheric pressure sensor, a motion sensor), an NR enhanced cell ID (NR E-CID) method, NR signals (e.g., multi-round trip time (multi-RTT), DL angle of departure (DL-AoD), DL time difference of arrival (DL-TDOA), UL time difference of arrival (UL-TDOA), and UL angle of arrival (UL-AoA) positioning), and / or one or more of other systems / signals / sensors.

[0064] Examples of UE include cellular phones, smart phones, session initiation protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablets, smart devices, wearable devices, vehicles, electric meters, gas pumps, large or small kitchen appliances, healthcare equipment, implants, sensors / actuators, displays, or any other similarly functional devices. Some of the UEs may be referred to as IoT devices (e.g., parking meters, gas pumps, toasters, vehicles, heart monitors, etc.). UE 104 may also be referred to as stations, mobile stations, subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, mobile phones, user agents, mobile clients, clients, or some other suitable terminology. In some scenarios, the term UE may also be applied to one or more supporting devices, such as in a device cluster arrangement. One or more of these devices may access a network together and / or individually.

[0065] Reference again Figure 1 In certain aspects, a device in communication with a base station, such as a UE 104 in communication with a network entity, such as a base station 102 or a component of a base station (e.g., a CU 110, a DU 130, and / or a RU 140), may be configured to manage one or more aspects of wireless communications. For example, the UE 104 may include a reporting component 198 configured to implement a greater number of ports for CJT in a low frequency band and with a distributed TRP / panel.

[0066] In certain aspects, the reporting component 198 can be configured to send information indicating the number of SD bases for each TRP in the set of TRPs. The example reporting component 198 can also be configured to receive downlink communications from at least a subset of the TRPs in the set of TRPs based on the information.

[0067] In certain aspects, the reporting component 198 may be configured to receive information indicating the number of SD bases for each TRP in the set of TRPs. In some examples, the information may not be associated with a first parameter indicating the number of FD bases and a second parameter indicating the maximum number of NZCs. The example reporting component 198 may also be configured to send a CSI report based on the information.

[0068] Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar areas such as LTE, LTE-A, CDMA, GSM, 6G, and other wireless technologies.

[0069] Figure 2A FIG200 is a diagram illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B FIG230 is a diagram illustrating an example of DL channels within a 5G NR subframe. Figure 2C 250 is a diagram illustrating an example of a second subframe within a 5G NR frame structure. Figure 2D FIG280 is a diagram illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be frequency division duplex (FDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to either DL or UL, or may be time division duplex (TDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to both DL and UL. Figure 2A , Figure 2C In the example provided, the 5G NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (most of which are DL), where D is DL, U is UL, and F is flexible between DL / UL, and subframe 3 is configured with slot format 1 (all of which are UL). Although subframes 3 and 4 are shown as having slot formats 1 and 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are full DL and full UL, respectively. Other slot formats 2-61 include a mix of DL, UL and flexible symbols. The UE is configured with the slot format through the received slot format indicator (SFI) (dynamically configured through DL control information (DCI) or semi-statically / statically configured through radio resource control (RRC) signaling). Note that the following description also applies to the 5G NR frame structure as TDD.

[0070] FIG. 2A to FIG. 2DThe frame structure is illustrated, and various aspects of the present disclosure may be applicable to other wireless communication technologies that may have different frame structures and / or different channels. A frame (10ms) may be divided into 10 equally sized subframes (1ms). Each subframe may include one or more time slots. A subframe may also include a microslot, which may include 7, 4, or 2 symbols. Each time slot may include 14 or 12 symbols, depending on whether the cyclic prefix (CP) is normal or extended. For a normal CP, each time slot may include 14 symbols, and for an extended CP, each time slot may include 12 symbols. The symbol on the DL may be a CP orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbol. The symbol on the UL may be a CP-OFDM symbol (for high throughput scenarios) or a discrete Fourier transform (DFT) extended OFDM (DFT-s-OFDM) symbol (for power-constrained scenarios; limited to single-stream transmission). The number of time slots within a subframe is based on the CP and parameter set. The numerology defines the subcarrier spacing (SCS) (see Table 1). The symbol length / duration can be scaled with 1 / SCS.

[0071]

[0072] Table 1: Parameter set, SCS and CP

[0073] For normal CP (14 symbols / slot), different parameter sets μ0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For extended CP, parameter set 2 allows 4 slots per subframe. Therefore, for normal CP and parameter set μ, there are 14 symbols / slot and 2μ slots / subframe. As shown in Table 1, the subcarrier spacing can be equal to 2μ*15kHz, where μ is parameter set 0 to 4. Therefore, the subcarrier spacing for parameter set μ=0 is 15kHz, and the subcarrier spacing for parameter set μ=4 is 240kHz. The symbol length / duration is negatively correlated with the subcarrier spacing. FIG. 2A to FIG. 2D An example of a parameter set μ=2 with a normal CP of 14 symbols per slot and 4 slots per subframe is provided. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is about 16.67 μs. Within a frame set, there may be one or more different bandwidth parts (BWPs) that are frequency-division multiplexed (see Figure 2B ). Each BWP may have a specific parameter set and CP (normal or extended).

[0074] A resource grid may be used to represent the frame structure. Each slot includes a resource block (RB) (also referred to as a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a number of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0075] like Figure 2A As illustrated, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include a demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0076] Figure 2B Examples of various DL channels within a subframe of a frame are illustrated. A physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including six RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. A PDCCH within a BWP may be referred to as a control resource set (CORESET). The UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., a common search space, a UE-specific search space) during a PDCCH monitoring opportunity on a CORESET, wherein the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at higher and / or lower frequencies on the channel bandwidth. A primary synchronization signal (PSS) may be within symbol 2 of a particular subframe of a frame. The PSS is used by UE 104 to determine subframe / symbol timing and physical layer identification. A secondary synchronization signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and the radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as an SS block (SSB)). The MIB provides the system frame number (SFN) and the number of RBs in the system bandwidth. The physical downlink shared channel (PDSCH) carries user data, broadcast system information not sent over the PBCH (such as the system information block (SIB)), and paging messages.

[0077] like Figure 2CAs illustrated, some of the REs carry DM-RS (indicated as R for a particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may send a DM-RS for a physical uplink control channel (PUCCH) and a DM-RS for a physical uplink shared channel (PUSCH). The PUSCH DM-RS may be sent in the first or first two symbols of the PUSCH. Depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used, the PUCCH DM-RS may be sent in different configurations. The UE may send a sounding reference signal (SRS). The SRS may be sent in the last symbol of a subframe. The SRS may have a comb structure, and the UE may send the SRS on one of the comb structures in the comb structure. The SRS may be used by the base station for channel quality estimation to achieve frequency-dependent scheduling of the UL.

[0078] Figure 2D Examples of various UL channels within a subframe of a frame are illustrated. The PUCCH may be located at a position as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicators (CQI), precoding matrix indicators (PMI), rank indicators (RI), and hybrid automatic repeat request (HARQ) acknowledgement (ACK) (HARQ-ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACKs and / or negative ACKs (NACKs)). The PUSCH carries data and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0079] Figure 3 is a block diagram illustrating an example of a first wireless device configured to exchange wireless communications with a second wireless device. Figure 3 In the illustrated example, the first wireless device may include a base station 310, the second wireless device may include a UE 350, and the base station 310 may communicate with the UE 350 in the access network. Figure 3 As shown, base station 310 includes a transmit processor (TX processor 316), a transmitter 318Tx, a receiver 318Rx, an antenna 320, a receive processor (RX processor 370), a channel estimator 374, a controller / processor 375, and a memory 376. Example UE 350 includes antenna 352, a transmitter 354Tx, a receiver 354Rx, an RX processor 356, a channel estimator 358, a controller / processor 359, a memory 360, and a TX processor 368. In other examples, base station 310 and / or UE 350 may include additional or alternative components.

[0080] In the DL, Internet Protocol (IP) packets may be provided to the controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with transfer of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0081] The TX processor 316 and the RX processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) coding / decoding of the transport channel, interleaving, rate matching, mapping onto the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-order phase shift keying (M-PSK), M-order quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be separated into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., a pilot) in the time and / or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially pre-coded to generate multiple spatial streams. Channel estimates from channel estimator 374 may be used to determine coding and modulation schemes and for spatial processing. Channel estimates may be derived from reference signals and / or channel state feedback sent by UE 350. Each spatial stream may then be provided to a different one of antennas 320 via a separate transmitter (e.g., transmitter 318Tx). Each transmitter 318Tx may modulate a radio frequency (RF) carrier with a corresponding spatial stream for transmission.

[0082] At the UE 350, each receiver 354Rx receives a signal through its corresponding antenna in the antenna 352. Each receiver 354Rx recovers the information modulated onto the RF carrier and provides the information to the RX processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial stream destined for the UE 350. In the case where multiple spatial streams are destined for the UE 350, two or more of the multiple spatial streams can be combined into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier and the reference signal are recovered and demodulated by determining the most likely signal constellation point sent by the base station 310. These soft decisions can be based on the channel estimate calculated by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally sent on the physical channel by base station 310. The data and control signals are then provided to controller / processor 359, which implements layer 3 and layer 2 functionality.

[0083] The controller / processor 359 may be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport channels and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets. The controller / processor 359 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0084] Similar to the functionality described in conjunction with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functionality associated with delivery of upper layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0085] Channel estimates derived by the channel estimator 358 from a reference signal or feedback sent by the base station 310 may be used by the TX processor 368 to select appropriate coding and modulation schemes and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different ones of the antennas 352 via separate transmitters (e.g., transmitter 354Tx). Each transmitter 354Tx may modulate an RF carrier with a corresponding spatial stream for transmission.

[0086] UL transmissions are processed at the base station 310 in a manner similar to that described in conjunction with the receiver functionality at the UE 350. Each receiver 318Rx receives a signal through its corresponding one of the antennas 320. Each receiver 318Rx recovers information modulated onto an RF carrier and provides the information to the RX processor 370.

[0087] The controller / processor 375 may be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport channels and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover IP packets. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0088] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 The reporting component 198 combines various aspects.

[0089] In some examples, a wireless communication system may support connectivity for a large number of UEs. Such wireless communication systems may include multiple TRPs to, for example, improve reliability, coverage, and / or capacity. In a multi-TRP communication system, a network entity and a UE may communicate with each other by using one or more of the multiple TRPs to transmit communications. For example, a network entity may be connected to multiple geographically distributed TRPs, which may then separately or jointly output communications to one or more UEs and / or separately or jointly obtain communications from one or more UEs. For example, a network entity may be connected to a first TRP and a second TRP, which may each be connected to a UE. In some such examples, the network entity and the UE may communicate (e.g., send and / or receive communications) via a first TRP, may communicate via a second TRP, or may communicate via a first TRP and a second TRP.

[0090] Figure 4 4 is a diagram illustrating an example of a wireless communication system 400 including a UE 404, a first network entity 402 ("NE1"), a second network entity 403 ("NE2"), and a plurality of TRPs as presented herein. Figure 4 In the illustrated example, the first network entity 402 and the UE 404 are operating in a multi-TRP communication mode, wherein the first network entity 402 communicates with a first TRP 406a ("TRP1") and a second TRP 406b ("TRP2"), each of which is connected to the UE 404. Therefore, communications between the first network entity 402 and the UE 404 may be conveyed via one or both of the first TRP 406a and the second TRP 406b. For example, with respect to downlink communications output by the first network entity 402 to the UE 404, the downlink communications may be output by the first network entity 402 to one or both of the first TRP 406a and the second TRP 406b, and then output by one or both of the first TRP 406a and the second TRP 406b to the UE 404.

[0091] When a multi-TRP communication mode is adopted, the communication may include joint transmission, in which multiple TRPs transmit data to the UE concurrently, for example. The joint transmission may include coherent joint transmission (CJT) or non-coherent joint transmission (NCJT). When data (e.g., layers) can be pre-coded separately on different TRPs, the joint transmission may be NCJT. When the same layer can be transmitted via multiple TRPs with phase coherence, the joint transmission may be CJT. In some aspects, the coherence of CJT may refer to the phase coherence between TRPs that can transmit the same layer, which is in contrast to NCJT, in which each layer is transmitted via a single TRP and the phase coherence between TRPs may not provide additional benefits. In some examples, the joint transmission may be coherent when multiple TRPs can be coordinated with each other, for example, via a backhaul connection. However, when multiple TRPs cannot be coordinated, for example due to non-ideal backhaul, joint scheduling between the corresponding TRPs may not be feasible (e.g., due to delays associated with coordinated control signaling and / or data, and / or limited backhaul capacity).

[0092] For example, in Figure 4 In the illustrated example, the first TRP 406a and the second TRP 406b can establish a backhaul connection 410, which enables the first TRP 406a and the second TRP 406b to coordinate joint transmission (e.g., coherent joint transmission). Therefore, when sending communications between the first network entity 402 and the UE 404, the first TRP 406a and the second TRP 406b can coordinate. For example, the first TRP 406a and the second TRP 406b can coordinate transmission to reduce interference or overlap of signals.

[0093] In other examples, one or more of the TRPs may not be able to coordinate joint transmissions. For example, similar to the first network entity 402, the second network entity 403 may also be in a multi-TRP communication mode with the UE 404. For example, the second network entity 403 may communicate with a second TRP 406b and a third TRP 406c ("TRP3"), each of which communicates with the UE 404. Therefore, communications communicated between the second network entity 403 and the UE 404 may be communicated via one or both of the second TRP 406b and the third TRP 406c. Figure 4 In the example of , the second TRP 406b and the third TRP 406c may not be able to establish a backhaul connection and / or may establish a non-ideal backhaul connection. In such a scenario, although the second TRP 406b and the third TRP 406c can support joint transmission, the joint transmission may be NCJT.

[0094] although Figure 4The description provides an example where the wireless communication system 400 includes three TRPs, but in other examples, the wireless communication system may include any suitable number of TRPs. Additionally, other examples may include any suitable number of TRPs that facilitate coherent joint transmission and / or any suitable number of TRPs that facilitate incoherent joint transmission.

[0095] A channel state feedback procedure may facilitate channel estimation at the UE. For example, the channel state feedback procedure may include the UE receiving a CSI-RS from a network entity. The UE may generate (or measure) CSI based on, for example, the CSI-RS, and send a CSI report including the CSI to the network entity. The CSI generated by the UE may include one or more components, such as a CSI-RS resource indicator (CRI), a rank indicator (RI), a channel quality indicator (CQI), a precoding matrix indicator (PMI), a layer indicator (LI), etc. In some examples, the network entity may send a downlink communication to the UE based on the CSI included in the CSI report. In an example where the network entity and the UE are operating in a multi-TRP communication mode, when executing the channel state feedback procedure, the UE may generate CSI for one or more TRPs in the TRP. Therefore, it can be understood that as the number of TRPs increases, the size of the CSI report will also increase.

[0096] Various aspects disclosed herein provide techniques for improving CSI acquisition for CJT targeting low frequency bands (such as FR1) and up to 4 TRPs. In such scenarios, it can be appreciated that backhaul connectivity between TRPs is desirable and synchronization (e.g., coordination of transmissions) is supported. Additionally, the number of antenna ports across all TRPs can be the same. Thus, various aspects disclosed herein can facilitate providing Type II codebook refinement for CJT in a multi-TRP (mTRP) communication mode targeting FDD and its associated CSI reporting, while also considering (e.g., taking into account) the tradeoff between throughput and overhead.

[0097] Aspects disclosed herein facilitate targeting CJT in low frequency bands and achieving a larger number of ports with distributed TRPs / panels. For example, for a single TRP / panel with, for example, 32 ports, the antenna array size may be too large for practical deployment.

[0098] In the examples disclosed herein, the maximum number of CSI-RS ports per resource remains at 32 ports.

[0099] Figure 5A 500 is a diagram illustrating the characteristics of NCJT as presented herein. Graph 500 illustrates that for NCJT, with first data 502 ("X A″) may be associated with a first set of layers (e.g., a set of layers) associated with a first set of TRP ports (e.g., ports of a first TRP 504 (“TRP A”)) and associated with a second data 512 (“X B ″) may be associated with a second set of layers (e.g., a set of two layers) may be associated with a second set of TRP ports (e.g., ports of TRP 514 (“TRP B”)). For NCJT, the first data 502 and the second data 512 may be pre-decoded using a pre-decoder matrix 530.

[0100] Data may be pre-coded separately at different TRPs. For example, the first column of the pre-coder matrix 530 indicates that at a first instance, the first TRP 504 will transmit data, and the value "0" indicates that the second TRP 514 will not transmit data. Then, the second column of the pre-coder matrix 530 indicates that at a second instance, the first TRP 504 will not transmit (e.g., based on the value "0"), and the second TRP 514 will transmit. Figure 5A In the example, the data is represented by X A (eg, first data 502) and X B (eg, second data 512) indicates that the first data 502 is based on the first pre-decoder component 532 ("V A ″) is pre-decoded, and the second data 512 is based on the second pre-decoder component 534 (″V B ″) are pre-decoded for transmission on the first TRP 504 and the second TRP 514 respectively.

[0101] exist Figure 5A In the illustrated example, the pre-decoder matrix 530 may have a The dimensions of is a value based on the number of transmit antennas of TRP, and RI TRP Corresponds to the rank indicator (RI) for the TRP, for example, the number of layers for the TRP. Figure 5A In the embodiment, the first TRP 504 includes four antenna ports and 1 layer, for example, corresponding to the first pre-decoder component 532 having a dimension of 4×1, and the second TRP 514 includes four antenna ports and two layers, for example, corresponding to the second pre-decoder component 534 having a dimension of 4×2. For example, the data may be based on the RI corresponding to TRP×1, for example, RI TRP ×1, so that the first data 502 of the first TRP 504 has a dimension of 1×1, and the second data 512 of the second TRP 514 has a dimension of 2×1. Figure 5A In the example of , diagram 500 includes a mapping 540 for data sent on the TRP.

[0102] 5B is a diagram 550 illustrating the characteristics of CJT as presented herein. Diagram 550 illustrates that, in contrast to NCJT, for CJT, a first set of layers (e.g., a set of 2 layers) associated with joint data 552 ("X") may be jointly pre-decoded to be sent from both the first TRP and the second TRP via a first TRP port 554 and a second TRP port 556 in a coherent manner. For example, the first pre-decoder component 560A ("V A ″) and the second pre-decoder component 560B (″V B The joint data 552 is pre-decoded by a pre-decoder matrix 560 having a matrix P(t)=0.

[0103] Figure 5B The example pre-decoder matrix 560 may have a The dimensions of is the value of the number of transmit antennas based on TRP, and Corresponds to the maximum rank indicator for a TRP, e.g., the maximum number of layers for a TRP. Figure 5B In the example of , the first TRP and the second TRP each have four antenna ports and a maximum of 2 layers, so that the dimensions of the first pre-decoder component 560A and the second pre-decoder component 560B are each 4×2. The data may be based on For example, The joint data 552 has a dimension of 2×1. Figure 5B In the example, diagram 550 includes a joint mapping 570 for data sent on the TRP.

[0104] In some aspects, coherence of CJT refers to phase coherence between TRPs that may transmit the same layer, as opposed to NCJT where each layer is transmitted via a single TRP and phase coherence between TRPs may not provide additional benefit. In some aspects of wireless communications, CJT may be extended to up to 4 TRPs based on a type II codebook, for example, in a low frequency band such as FR1. In some aspects, providing additional TRPs for CJT may effectively increase the size of the antenna used to transmit the low frequency transmissions.

[0105] Figure 6 6 is a diagram 600 illustrating components of a pre-decoder matrix 602 in some aspects of wireless communication. Figure 6 In the example of FIG. 1 , the pre-decoder matrix 602 (“W”) may be based on a first matrix 604 (“W1”), a second matrix 606 (“W f ″ or ″W f H ″) and the third matrix The first matrix 604 may be associated with the spatial domain (SD), the second matrix 606 may be associated with the frequency domain (FD), and the third matrix 608 may be associated with a set of non-zero coefficients (NZC). Figure 6 In the example of , the precoder matrix 602 may correspond to the precoders for one layer. Figure 6 In the example of , the pre-decoder matrix 602 can be generated for each layer, and up to four layers (e.g., supporting up to rank-4). For example, the pre-decoder matrix 602 can be generated for the first layer 610 ("layer 0"), the second layer 620 ("layer 1"), the third layer 630 ("layer 2"), and the fourth layer 640 ("layer 3").

[0106] In some aspects, the first matrix 604 ("W1") can be N t ×2L matrix, where N t is a value based on the number of transmit antennas and oversampling, and L is the number of beams used for joint transmission. t Both L and L may be RRC configurable. In some aspects, the first matrix 604 may be selected from a set of SD basis matrices (e.g., DFT basis) for the spatial domain. The first matrix 604 may be common to layers to be transmitted via joint transmission (e.g., NCJT or CJT). As used herein, the term "SD basis" may also be referred to as a "beam".

[0107] In some aspects, the second matrix 606 ("W f ″ or ″W f H ″) may be an M×N3 matrix, where M may be the number of RRC configurations of an FD basis (e.g., an FD DFT basis), and N3 is the number of spatial domain bases. In some examples, M may be rank (pair) specific. For example, for rank={1, 2}, M1=M2, and for rank={3, 4}, M3=M4. In some aspects, the second matrix 606 may be layer specific, such that the second matrix W f or W f H A first set of selected FD bases associated with a first layer may be included, wherein the first set of selected FD bases may or may not be combined with a second matrix W associated with a second layer. f or W f H The sets of selected FD bases overlap completely or partially.

[0108] In some aspects, the third matrix The third matrix 608 may be a 2L×M matrix including a set of NZCs. In some aspects, the third matrix 608 is layer specific and the CSI report may report up to K0 NZCs per layer and up to 2K0 NZCs across all layers, where unreported coefficients are assumed to be zero or are indeed set to zero. These coefficients may be quantized based on preconfigured quantization values ​​and / or may be quantized based on RRC configured quantization values.

[0109] Figure 7 is an example of a pre-decoder component (eg, SD component W1, FD component W2) used in some aspects of CJT as presented herein. f or W f H And the coefficient components ). In a first scenario 710, the TRP may be a co-located TRP / panel and may be referred to as an "intra-site" TRP. In a second scenario 730, the TRP may be a distributed TRP and may be referred to as an "inter-site" TRP.

[0110] In examples where the TRPs are intra-site TRPs (e.g., the first scenario 710), the TRPs may have the same spatial orientation (e.g., the first intra-site scenario 712) or may have different spatial orientations (e.g., the second intra-site scenario 720). For example, in the first intra-site scenario 712 (e.g., scenario 1A) associated with CJTs from multiple co-located TRPs having the same spatial orientation (e.g., antennas at the same site), the same spatial domain matrix W1 may be associated with each TRP (or used for each TRP) (e.g., for the first TRP 714 ("TRP A") and for the second TRP 716 ("TRP B")). In the second intra-site scenario 720 (e.g., scenario 1B) associated with CJTs for co-located TRPs having different spatial orientations (e.g., antennas at the same site), different spatial domain matrices W1 may be associated with each TRP (e.g., for the first TRP 714 ("TRP A") and for the second TRP 716 ("TRP B")). 1，A and W 1，B may be associated with (or used for) different TRPs (e.g., for the third TRP 722 ("TRP A") is the spatial domain matrix W 1，A , and for the fourth TRP 724 ("TRP B") is the spatial domain matrix W 1，B ).

[0111] In the example where the TRP is an inter-site TRP (eg, the second scenario 730), each component (eg, SD component W1, FD component W2, etc.) may be selected independently. f or W f H And the coefficient components ). For example, different spatial domain matrices W 1，A and W1，B may be associated with (or used for) different TRPs at different sites (eg, for the fifth TRP 732 ("TRP A") is the spatial domain matrix W 1，A， And for the sixth TRP 734 ("TRP B") is the spatial domain matrix W 1，B ). Additionally, different frequency domain matrices W f，A H or W f，B H may be associated with (or used for) different TRPs at different sites (eg, for the fifth TRP 732, the spatial domain matrix W f，A H , and for the sixth TRP 734 is the spatial domain matrix W f，B H Finally, each of the fifth TRP 732 and the sixth TRP 734 may be further connected to different third components. and Associated.

[0112] exist Figure 7 In the illustrated example, the codebook structure may be based on whether the FD component is common to the two TRPs or independent. In the example where the FD component is common to the two TRPs, the corresponding codebook may be referred to as a "mode 2 codebook", which may also be referred to as a "FD joint". In such a scenario, the FD component W f or W f H It is the same for TRP A and TRP B.

[0113] In the example where the FD components are separate or independent for the two TRPs, the corresponding codebook may be referred to as a "mode 1 codebook", which may also be referred to as "FD independent". In such a scenario, different FD matrices W f，A H or W f，B H can be associated with (or used for) different TRPs at different sites (e.g., for the fifth TRP 732, the spatial domain matrix W f，A H , and for the sixth TRP 734 is the spatial domain matrix W f，B H ).

[0114] Referring again to the Type II codebook for CJT with multiple TRPs, two different TRP selection and / or determination schemes may be employed, where the value N represents the number of cooperative TRPs assumed in, for example, a CSI report from a UE to a PMI report of a network entity. In a first alternative, the value N may be configured by the network (e.g., by a base station) via higher layer signaling (such as RRC signaling). In such an example, the value of N indicates the number of TRPs (e.g., N=N TRP ). In some such examples, the UE may report only one transmission hypothesis in the CSI report.

[0115] In a second alternative, N TRPs may be selected by the UE and reported to the network as part of the CSI report. In some such examples, the N TRPs reported by the UE may be between 1 and N. TRP where N refers to the number of selected TRPs, and N TRP Refers to the maximum number of collaborative TRPs. In some examples, N TRP The value of may be configured by the network. For example, the network may configure four TRPs (e.g., TRP A to TRP D) for the UE. In some such examples, the UE may select N TRPs, where N is between 1 and 4. In examples where the UE selects N TRPs, the UE may also report which of the TRPs were selected. For example, the UE may select two TRPs and indicate that the UE selected TRP A and TRP C. In some such examples, the UE may report only one transmission hypothesis in the CSI report.

[0116] In some examples, the network may configure a set of parameters for a single TRP communication mode for the UE. For example, the network may output a parameter combination configuration, which may be referred to as a "ParamCombination" configuration or any other name, that configures the UE with a first parameter L, a second parameter p1, a third parameter p3, and a fourth parameter β. The parameter combination configuration may be provided to the UE via higher layer signaling (such as RRC signaling).

[0117] Figure 8 A portion of a table 800 illustrating different combinations of parameters based on the value of a parameter combination indicator 802 as presented herein is depicted. Figure 8 As shown, the value of parameter combination indicator 802 may range from 1 to 8, and the values ​​of different parameters may be set accordingly. Figure 8 In the example of , the value of the parameter combination indicator 802 sets the value of the first parameter 804 (L), the second parameter 806 (p1), the third parameter 808 (p3), and the fourth parameter 810 (β). Figure 8 In the example of , the value of the second parameter 806 can be applied to rank 1 and rank 2, and the value of the third parameter 808 can be applied to rank 3 and rank 4.

[0118] exist Figure 8 In the example of , the value of the first parameter 804 indicates the number of beams. Figure 8 As shown, the value of the first parameter can be 2, 4, or 6 beams (e.g., L = {2, 4, 6}). Figure 8 In the example of , the value of the second parameter 806 may be "1 / 4" or "1 / 2". The value of the third parameter 808 may be "1 / 8" or "1 / 4". The value of the fourth parameter 810 may be "1 / 4", "1 / 2" or "3 / 4".

[0119] The UE may use the value configured by the parameter combination indicator 802 to determine the third matrix of the precoder The UE may select the number of SD bases L, the number of FD bases M, and the number of NZCs for each layer in . For example, the UE may select the number of SD bases indicated by the first parameter 804. For example, when the parameter combination indicator 802 is set to "3", the UE may select four SD bases.

[0120] The UE may select the number of FD bases M based on the rank. In some examples, the value of M may correspond to the delay associated with the selected path associated with the same beam. When the rank is 1 or 2, the UE may use Equation 1 (described below) to determine the number of FD bases to select.

[0121] Equation 1:

[0122] In Equation 1, the value of the FD basis M is the same for rank 1 and rank 2, and therefore, Equation 1 can be rewritten as Equation 2 (described below).

[0123] Equation 2:

[0124] When the rank is 3 or 4, the UE may use Equation 3 (described below) to determine the number of FD bases to select.

[0125] Equation 3:

[0126] In Equation 3, the value of the FD basis M is the same for rank 3 and rank 4, and therefore, Equation 3 can be rewritten as Equation 4 (described below).

[0127] Equation 4:

[0128] In equations 1 to 4, the term "p rank{1，2} The values ​​of "p1" and "p2" can be obtained by Figure 8 The second parameter 806 of the term "p rank{3，4} The values ​​of "p3" and "p4" can be obtained by Figure 8The third parameter 808 of is given. The value of the item "N3" corresponds to the number of PMI subbands and can be determined by the number of CQI subbands and the number of PMI subbands per CQI subband (e.g., R = {1, 2}). The number of CQI subbands can be determined by a higher layer parameter that can be referred to as a "csi-ReportingBand" parameter or any other name. The number of PMI subbands per CQI subband (R) can be configured by a higher layer parameter that can be referred to as a "numberOfPMISubbandsPerCQISubband" parameter or any other name. In the example where R is equal to 1, the total number of PMI subbands N3 can be selected from a set of 1 to 19 (e.g., N3 = {1, 2, ..., 19}), and the total number of PMI subbands can correspond to the FD basis length. In the example where R is equal to 2, the total number of PMI subbands can be selected from a set of 1 to 37 (e.g., N3 = {1, 2, ..., 37}). In the scenario where R is equal to 2, the PMI subband size may be finer than the CQI subband size (eg, half the CQI subband size).

[0129] For edge CQI subbands, if the number of RBs is less than or equal to the nominal CQI subband size / 2, the UE may report one PMI. If the number of RBs is greater than the nominal CQI subband size / 2, the UE may report two PMIs. In some examples, for other CQI subbands (e.g., non-edge CQI subbands), the UE may report two PMIs.

[0130] The UE may select the number of NZCs per layer and across all layers. The UE may select the number of NZCs per layer such that the selected number is less than or equal to the maximum number of NZCs per layer, K0. Additionally, the UE may select the total number of NZCs across all layers that is less than or equal to 2*K0. The UE may determine the maximum number of NZCs per layer, K0, using Equation 5 (described below).

[0131] Equation 5:

[0132] Therefore, it can be understood that based on the parameter combination of (L, p1, p3, β), and as indicated by the value of parameter combination indicator 802, the UE can select the number of SD bases, the number of FD bases, and the number of NZCs.

[0133] However, Figure 8The example table corresponds to a single TRP communication mode. Therefore, when operating in a multi-TRP communication mode, it may be beneficial to enable the UE to select the number of SD bases, the number of FD bases, and the number of NZCs. For example, in the case of multiple TRPs, the parameter combination may also include a TRP-level parameter that enables the selection of the number of SD bases, the number of FD bases, and the number of NZCs to be indicated at each TRP level. For example, there may be a certain number of selected SD bases (L n ) and / or a certain number of selected FD bases (M n ), and wherein the value of n is between 1 and N TRPs (e.g., n=(1, ..., N TRP As described above, the value of TRP N may be configured by the network (eg, Alternative 1) or by the UE (eg, Alternative 2).

[0134] Additionally, it is understood that the payload size of the CSI report may be affected based on the number of TRPs selected by the UE. That is, due to the selection of a different number of TRPs, such as when the selected number of TRPs (N) is less than or equal to the configured number of TRPs (N). TRP ), different numbers of selected SD bases (L tot ) may be beneficial. For example, a UE may be configured with four TRPs (e.g., N TRP =4), but the UE may select two of the TRPs to include the CSI of these two TRPs in the CSI report (e.g., N=2). That is, for a smaller number of selected TRPs, the total number of SD bases across all TRPs (L tot ) may be possible.

[0135] For example, in the first example scenario, the value of the SD basis across all TRPs (L tot ) can be set to six (for example, L tot =6), with four TRPs and 32 ports, where each TRP has N1N2=2 ports per polarization. In such a scenario, if the UE selects a single TRP, then L tot =6 may be redundant since each TRP is configured with four ports.

[0136] In the second example scenario, the value of the SD basis across all TRPs (L tot ) can be set to four (for example, L tot =4), with four TRPs and 16 ports, where each TRP has N1N2=2 ports per polarization. In such a scenario, when the UE selects a single TRP or selects two TRPs, the L tot =4 indication may be redundant.

[0137] As described above, in some aspects of wireless communication, a CSI report may be divided into two parts (e.g., CSI Part 1 and CSI Part 2). For example, having multiple CSI parts may allow for a larger CSI payload size. In some aspects, CSI Part 1 may have a fixed payload size and may have a smaller payload size than CSI Part 2. In some aspects, CSI Part 1 may include more significant (important) information than CSI Part 2, and may therefore be sent in a manner that achieves higher reliability of reception of CSI Part 1. As an example, CSI Part 1 may include rank indicator (RI) information and channel quality indicator (CQI) information. CSI Part 2 may have a variable payload size, and CSI Part 1 may also include information for determining the payload size of CSI Part 2. In some aspects, CSI Part 1 may include non-zero coefficients (NZCs) that help enable a receiver of a CSI report to determine the payload size of the CSI part.

[0138] Fig. 9 900 is a diagram illustrating an example of a two-part CSI as presented herein. Fig. 9 In the illustrated example of , diagram 900 illustrates a first CSI portion 910 (eg, CSI portion 1) and a second CSI portion 930 (eg, CSI portion 2). Fig. 9 In the example of FIG. 1 , the first CSI part 910 includes an RI field 912, a CQI field 914, and an NZC quantity field 916. The RI field 912 may indicate the number of layers associated with the corresponding transmission. The CQI field 914 may indicate CQI information associated with the corresponding transmission. The NZC quantity field 916 may indicate NZC information associated with the corresponding transmission. For example, the NZC field 916 may indicate the total number of NZCs across all layers. The NZC field 916 may have a bit width of log2 2K0 bits, where the value of “K0” may be determined by the parameter combination indicator and Equation 5 (above). In some examples, both the RI field 912 and the NZC quantity field 916 may be used to determine the payload size of the second CSI portion 930 .

[0139] exist Fig. 9 In the example of FIG. 1 , the second CSI part 930 includes an SD basis selection field 932 and an FD basis selection field 934. The SD basis selection field 932 may indicate that L beams are selected from N1N2O1O2 total beams of the SD component W1 for the precoder W. The FD basis selection field 934 may indicate that L beams are selected from N1N2O1O2 total beams of the SD component W1 for the precoder W. f or W f HThe selection of the M FD bases may be for each layer. For example, the RI field 912 of the first CSI part 910 may indicate that there are RI layers, and therefore, the FD base selection field 934 may indicate M FD bases for layer 0 to layer RI-1.

[0140] The beam group (i 1，1 The bit width of the ) component may be log2 O1O2 bits. The beam indication (i 1，2 ) component can be The bit width of the FD base selection field 934 may depend on the value of the total number N3 of PMI subbands. For example, when the total number N3 of PMI subbands is less than or equal to 19, the UE may report (i 1，6，l ) component, where L = 0, ..., RI-1 and use In the example where the total number N3 of PMI subbands is greater than 19, the UE may use a two-level window-based selection.

[0141] In some examples, the second CSI portion 930 may include an indication of parameters associated with the NZC indicated in the NZC quantity field 916 of the first CSI portion 910. For example, the second CSI portion 930 may include a strongest coefficient indication field 936 for each of layers 0 to RI-1, a coefficient selection indication field 938 for each of layers 0 to RI-1, and an NZC quantization indication field 940 for each of layers 0 to RI-1. The strongest coefficient indication field 936 may indicate the strongest coefficient in the third matrix of the pre-decoder W. The coefficient selection indication field 938 may indicate (eg, using a bitmap per layer) where NZC is in the third matrix for each of layers 0 to RI-1. The NZC quantization indication field 940 may indicate the amplitude and / or phase quantization for the NZC in each layer (eg, based on the strongest coefficient indication indicated by the strongest coefficient indication field 936 for the corresponding layer).

[0142] When RI is one, the bit width of the strongest coefficient indication (SCI) of the strongest coefficient indication field 936 may be When RI is greater than one, the bit width of the SCI of the strongest coefficient indication field 936 may be The bit width of the coefficient selection indication field 938 may be the RI size - 2LM bitmap, for a total of 2LMxRI bits.

[0143] By referring to the weaker polarization in amplitude, the NZC indication field 940 (i 2，3，lThe bit width of the ) component may be 4 bits. Based on the differential magnitude of each coefficient except the strongest coefficient, the (i 2，4，l ) component can be The NZC indication field 940 is (i digits) based on the phase of each coefficient except the strongest coefficient. 2，5，l ) component can be Units digit.

[0144] It is understood that in other examples, the order of the fields of the first CSI part 910 and / or the second CSI part 930 may be different. Additionally or alternatively, in other examples, the first CSI part 910 and / or the second CSI part 930 may include additional or alternative fields.

[0145] In some aspects of the present disclosure, additional information for CJT is provided in one or more of CSI Part 1 or CSI Part 2.

[0146] In some aspects of wireless communication, CSI indicating TRP selection for CJT may be associated with an enhanced Type II (eType-II) codebook. While a fixed payload size may be associated with a first portion of the CSI, a payload size for a second portion of the CSI may be variable and may depend on (or be based on) the number of selected TRPs. The variable payload size for the second portion of the CSI may be based on one or more of the following: (1) different sizes of a first matrix W1 for SD basis selection indication (e.g., via SD basis selection field 932), (2) a second matrix W1 for FD basis selection indication (e.g., via indication of FD basis selection field 934). f and / or (3) for a third matrix Different sizes of the associated strongest coefficient indication field 936 , coefficient selection indication field 938 and / or NZC quantization indication field 940 .

[0147] In an example where the UE and a network entity communicate via CJT with multiple TRPs (“mTRPs”), the CSI report may indicate TRP selection for N TRPs (and associated precoders, e.g., using an eType-II codebook), where N is the number of collaborative TRPs assumed in the PMI report.

[0148] Fig.10 An example communication flow 1000 between a network entity 1002 and a UE 1004 as presented herein is illustrated. One or more aspects described with respect to the network entity 1002 may be performed by a component of a base station or a component of a base station such as a CU, DU, and / or RU. Aspects of the network entity 1002 may be performed by Figure 1 Base station 102 and / or Figure 3 Various aspects of UE 1004 may be implemented by base station 310. Figure 1 UE 104 and / or Figure 3 UE 350. Fig.10 Not shown in the illustrated example, but in other examples, the network entity 1002 and / or the UE 1004 may communicate with one or more other base stations or UEs.

[0149] exist Fig.10 In the example of , the network entity 1002 and the UE 1004 may each have multiple TRPs and have CJT capabilities. In the illustrated example, the communication process 1000 facilitates the UE 1004 to select at least a certain number of SD bases using TRP-level parameters configured by the parameter combination.

[0150] like Fig.10 As shown, the network entity 1002 may send a CJT CSI configuration 1010 received by the UE 1004. The CJT CSI configuration 1010 may configure the UE 1004 to use one or more parameters when sending a CSI report. In some examples, the CJT CSI configuration 1010 may include a parameter configuration indication that configures one or more parameters. In some examples, the CJT CSI configuration 1010 may indicate the number of TRPs and / or indicate certain TRPs. In some examples, the CJT CSI configuration 1010 may configure the UE 1004 to select a certain number of TRPs and / or select one or more TRPs in a set of TRPs. In some examples, the CJT CSI configuration 1010 may indicate the total number of SD bases across all TRPs. In some examples, the CJT CSI configuration 1010 may indicate the number of SD bases used for the corresponding TRP.

[0151] The network entity 1002 may send one or more CSI-RS 1020 that are received by the UE 1004. At 1030, the UE 1004 may perform measurements on the CSI-RS 1020. At 1040, the UE 1004 may determine a set of parameters for a CSI report 1050. The set of parameters for the CSI report 1050 may be based on the CJT CSI configuration 1010, and the values ​​of the set of parameters may be based on the measurements of the CSI-RS 1020.

[0152] like Fig.10 As shown, UE 1004 may send a CSI report 1050 that is received by network entity 1002. CSI report 1050 may be populated with values ​​determined by UE 1004 (e.g., at 1040). Fig.10In the example of , CSI report 1050 includes a first CSI portion 1052 ("CSI portion 1") and a second CSI portion 1054 ("CSI portion 2"). The first CSI portion 1052 may have a fixed payload size, and the second CSI portion 1054 may have a variable payload size indicated by the first CSI portion 1052. Figures 13 to 16 and Fig.18 As described, at least one of the first CSI portion 1052 or the second CSI portion 1054 may indicate the number of SD bases for each TRP in a set of TRPs for a CJT for data (eg, downlink communication 1070).

[0153] At 1060, the network entity 1002 may decode the first CSI portion 1052 of the CSI report 1050. At 1062, the network entity 1002 may decode the second CSI portion 1054 of the CSI report 1050. The network entity 1002 may use aspects of the first CSI portion 1052 to determine a payload size for the second CSI portion 1054. Based on the first CSI portion 1052 and / or the second CSI portion 1054, the network entity 1002 may output a downlink communication 1070 from at least a subset of the TRPs received by the UE 1004.

[0154] In a first configuration, the UE 1004 may include an indication of the number of SD bases for each TRP in a set of TRPs with a CSI report 1050. In some examples, the UE 1004 may include the indication of the number of SD bases for each TRP in a first CSI portion 1052. In other examples, the UE 1004 may include the indication of the number of SD bases for each TRP in a second CSI portion 1054. Aspects of the first configuration may be combined with Figures 11 to 16 describe.

[0155] In a second configuration, the CJT CSI configuration 1010 may include information indicating the number of SD bases for each TRP in the set of TRPs. This information may not be associated with the first parameter indicating the number of FD bases and the second parameter indicating the maximum number of NZCs. Aspects of the second configuration may be combined with Fig.11 , Fig.17 and Fig.18 describe.

[0156] Fig.11 A table 1100 illustrating different scenarios based on TRP selection and SD base number configuration is depicted. For example, TRP selection may be performed by the network where the UE does not select a TRP (e.g., Alternative 1), or TRP selection may be performed by the UE (e.g., Alternative 2). Additionally, the SD base number configuration may be for the total number of SD bases (Ltot ), or for each layer (L n ). The number of SD bases is for each layer (L n ), the configuration may be a common value (eg, the same value for each layer). In other examples, the number of SD bases for each layer (L n ) may be a TRP specific configuration value. For example, the configuration of the number of SD bases may include different values ​​for each TRP.

[0157] like Fig.11 As shown, based on TRP selection and SD base number configuration, four example cases may be available. In the first case 1110 ("Case 1"), the network selects the number of TRPs and configures the number of SD bases (L) across all layers. tot ). In such an example, the UE reports the number of SD bases used for each TRP (eg, the UE reports the number of SD bases for n=1, ...N TRP The value of L n ). In an example of the first case 1110, the reported value may be configured to satisfy Equation 6 (described below).

[0158] Equation 6: Where L n ≥1

[0159] That is, the UE may report the number of selected SD bases (L n ), where each TRP has at least one selected SD basis, and the sum of the SD basis selected for each TRP in the TRP should be equal to the value of the number of SD basis across all layers (L tot ).

[0160] In the second case 1120 ("Case 2"), the UE selects the number of TRPs and the network configures the number of SD bases across all layers (L tot ). In such an example, the UE reports the number of SD bases used for each TRP (eg, the UE reports the number of SD bases for n=1, ...N TRP The value of L n ). In an example of the second case 1120, the reported value may be configured to satisfy Equation 7 (described below).

[0161] Equation 7:

[0162] Similar to the example of the first case 1110, the UE may report the number of selected SD bases (L n). However, the UE may determine not to select some of the TRPs, and therefore, the non-selected TRPs may have the selected SD basis with a value set to zero. In such a scenario, the total number of selected SD basis across all layers may vary based on the number of TRPs selected by the UE. That is, when the network sets the value of the SD basis (L) across all TRPs tot ) is configured as six (for example, L tot =6) scenario (with four TRPs and 32 ports, where each TRP has N1N2=2 ports per polarization, but the UE selects a single TRP), the total number of SD bases selected by the UE may be less than the total number of SD bases across all layers configured by the network (L tot ).

[0163] In the third case 1130 ("Case 3"), the network selects a TRP for the UE to use, and the network configures the number of SD bases L for each TRP. n In such scenarios, the UE may skip reporting the number of SD bases for each TRP, since the number of SD bases is configured by the network and the TRP is also selected by the network. That is, there is a fixed number of SD bases per TRP, and there is a fixed number of TRPs, which results in a total number of SD bases (L) across all layers. tot ) of a fixed number.

[0164] In the fourth case 1140 ("Case 4"), the UE selects a TRP for use by the UE and the network configures the number of SD bases L for each TRP. n . In such a scenario, the UE may report which SD bases the UE has selected for each TRP.

[0165] exist Fig.11 In the example of, for example, selecting a TRP based on measurements performed by the UE may be determined by the UE, such as in combination with Fig.10 1030. In the example of the fourth case 1140, the UE may select a TRP based on the reference signal received power (RSRP) of the CSI-RS resource for each TRP accordingly. In the example of the second case 1120, the UE may select a TRP based on RSRP or additionally depending on the SD expected power, for example, an SD basis selection for the first matrix ("W1") of the precoder.

[0166] Fig.12 A portion of a table 1200 illustrating different combinations of parameters based on the value of a parameter combination indicator 1202 as presented herein is depicted. Fig.12 In the example, when multi-TRP communication is employed, parameter combination indicator 1202 facilitates configuring parameters for CSI reporting at the UE.

[0167] exist Fig.12In the example of FIG. 1 , the value of the parameter combination indicator 1202 may set the first parameter 1204 (L tot ), the values ​​of the second parameter 1206 (p1), the third parameter 1208 (p3), and the fourth parameter 1210 (β). Fig.12 , and similar to Figure 8 For example, the value of the second parameter 1206 may be applied to rank 1 and rank 2, and the value of the third parameter 1208 may be applied to rank 3 and rank 4.

[0168] exist Fig.12 In the example of , the value of the first parameter 1204 indicates the number of SD bases across all layers. Fig.12 As shown, the number of SD bases across all layers starts from four beams.

[0169] exist Fig.12 In the example of , the second parameter 1206 and the third parameter 1208 may be referred to as a first scaling factor, which may facilitate determining the number (M) of selected FD bases. Figure 8 In an example, when the rank is 1 or 2, the UE may use the value of the second parameter 1206, and when the rank is 3 or 4, the UE may use the value of the third parameter 1208. In some examples, the first scaling factor may be rank (pair) specific. Additionally, the UE may use a fourth parameter 1210 (e.g., a second scaling factor) to facilitate determining the maximum number (K0) of NZCs.

[0170] In some examples, when the UE is determining the number of selected FD bases (M) and the maximum number of NZCs (K0), the UE may select the maximum number of NZCs (K0) based on whether the UE is using the FD joint codebook (e.g., Figure 7 Mode 2 codebook) or FD independent codebook (for example, Figure 7 Mode 1 codebook) to apply different techniques.

[0171] In the example where the UE employs a FD joint codebook, the total number (M) of selected FD bases may be rank (pair) specific and may be related to the number of TRPs (e.g., N configured by the network). TRP In some such examples, to determine the number of FD bases to select, the UE may use Equation 8a (described below) when the rank is 1 or 2, and may use Equation 8b (described below) when the rank is 3 or 4.

[0172] Equation 8a:

[0173] Equation 8b:

[0174] In the example where the UE is adopting an FD independent codebook, the number of selected FD bases per TRP may be common (which may be referred to herein as "TRP-common" or "option 1"), or may be TRP-specific (which may be referred to herein as "TRP-specific" or "option 2"). In the example where the number of selected FD bases per TRP is common (e.g., TRP-common option), M n The value may be rank (pair) specific and may be determined by the number of TRPs (e.g., N configured by the network). TRP or determined by N) selected by the UE. Additionally, in order to determine Fig.11 For the first case 1110, the number of FD bases selected, when the rank is 1 or 2, the UE may use Equation 9a (described below), and when the rank is 3 or 4, the UE may use Equation 9b (described below).

[0175] Equation 9a:

[0176] Equation 9b:

[0177] about Fig.11 In the second case 1120, when the rank is 1 or 2, the UE may use equation 10a (described below) to determine the number of selected FD bases, and when the rank is 3 or 4, the UE may use equation 10b (described below). In the examples of equations 10a and 10b, the actual number of selected TRPs (N) may be less than or equal to the configured number of TRPs (N TRP ).

[0178] Equation 10a:

[0179] Equation 10b:

[0180] In other examples, when the rank is 1 or 2, the UE may use Equation 11a (described below) to determine the number of selected FD bases, and when the rank is 3 or 4, the UE may use Equation 11b (described below).

[0181] Equation 11a:

[0182] Equation 11b:

[0183] It can be appreciated that equation 11a and equation 11b are similar to equation 1 (above) and equation 3 (above), respectively. In some examples, equation 11a and equation 11b can be used in the first case 1110 and / or the second case 1120.

[0184] In examples where the number of selected FD bases per TRP is TRP-specific (eg, a TRP-specific option), M nThe value may be rank (pair) specific and may be related to the number of selected SD bases (L n ). Additionally, to determine the number of FD bases to be selected for a TRP-specific option, the UE may use Equation 12a (described below) when the rank is 1 or 2, and may use Equation 12b (described below) when the rank is 3 or 4.

[0185] Equation 12a:

[0186] Equation 12b:

[0187] As shown in Equations 12a and 12b, the number of selected FD bases (L) for the nth TRP is within the total number of selected SD bases across all TRPs. n ) and the number of selected SD bases for the nth TRP (L tot ). Equation 12a and Equation 12b can be used to Fig.11 The first case 1110 and Fig.11 The second situation 1120.

[0188] When determining the maximum number of NZCs (K0), the UE may use Fig.12 The fourth parameter 1210, the total number of selected SD bases across all layers (L tot ) and the M value associated with rank {1, 2} (M tot ) to determine the FD joint codebook (e.g., Figure 7 The UE may determine the maximum number of NZCs (K0) using the mode 2 codebook of the UE. For example, the UE may determine the maximum number of NZCs (K0) using Equation 13 (described below).

[0189] Equation 13:

[0190] Similar to the FD joint codebook scenario, when the UE is using the FD independent codebook (e.g. Figure 7 When option 1 (e.g., TRP common option) of mode 1 codebook of the UE is selected, the UE may use Fig.12 The fourth parameter 1210, the total number of selected SD bases across all layers (L tot ) and the M value associated with rank {1, 2} (M n ) to determine the maximum number of NZCs (K0). For example, the UE may use Equation 14 (described below) to determine the maximum number of NZCs (K0).

[0191] Equation 14:

[0192] In the scenario where the UE is using the FD independent codebook and using option 2 (e.g., TRP specific option), for Fig.11 In the first case 1110, the UE may Fig.12 The fourth parameter 1210 and the TRP When the number of selected SD bases (L n ) and then multiplied by the rank {1,2} associated number (M) of the selected FD basis n ) determines the maximum number of NZCs (K0). For example, when the network selects TRP and configures the total number of selected SD bases across all layers (L tot ), the UE may use Equation 15 (described below) to determine the maximum number of NZCs (K0).

[0193] Equation 15:

[0194] Additionally, when the UE selects TRP and the network configures the total number of selected SD bases across all layers (L tot ), the UE may use equation 16 (below) to determine the maximum number of NZCs (K0), such as in combination with Fig.11 The second situation 1120 is described.

[0195] Equation 16:

[0196] In the examples of Equation 15 and Equation 16, determining the maximum number of NZCs (K0) is similar, except that in Equation 15, the summation is over the number of TRPs (N TRP ) and in Equation 16, the summation is performed over the number of TRPs (N) selected by the UE.

[0197] In some examples, the total actual number of selected SD bases (L tot，actual ) may be different from the total number of selected SD bases (L tot ) configuration value. For example, when the UE selects TRP but the network configuration selects the total number of SD bases (L tot )of Fig.11 In the second case 1120, the UE may select beams based on RSRP. In some such examples, for example, when the UE selects those beams with RSRPs that satisfy a threshold, the number of beams selected by the UE may be less than the total number of configurations for the selected SD basis. For example, the UE may perform measurements on different beams across a set of TRPs and may select a subset of beams based on which of the beams have RSRPs that satisfy a threshold. In such examples, the UE may report the number of beams included in the subset of beams (L tot，actual ), the number of beams can be less than the total number of selected SD bases (L tot ) configuration value.

[0198] In some examples, the total actual number of selected SD bases (L tot，actual ) may depend on the number of selected TRPs (N) being no greater than a threshold, such as 1 TRP or 2 TRPs. For example, if the UE selects 1 TRP, the UE may determine the total actual number of selected SD bases (L) using Equation 17 (described below). tot，actual ).

[0199] Equation 17: L tot，actual =min(L tot , N1, N2)

[0200] That is, if the UE selects a single TRP (eg, N=1), the total actual number of SD bases reported by the UE (L tot，actual ) is the total number of selected SD bases (L tot ), the minimum value of the configuration value of ), the number of antenna elements in the first direction (N1) or the number of antenna elements in the second direction (N2).

[0201] In equations 8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b, 12a, 12b, 13, 14, 15, 16, and 17, the term " prank{1，2} The value of ″ can be obtained by Fig.12 The second parameter 1206 is given. prank{3，4} The value of ″ can be obtained by Fig.12 The value of the item "N3" corresponds to the number of PMI subbands and may be determined by the number of CQI subbands and the number of PMI subbands per CQI subband (e.g., R = {1, 2}). The number of CQI subbands may be determined by a higher layer parameter that may be referred to as a "csi-ReportingBand" parameter or any other name. The number of PMI subbands per CQI subband (R) may be configured by a higher layer parameter that may be referred to as a "numberOfPMISubbandsPerCQISubband" parameter or any other name.

[0202] The total number of SD bases in the network configuration (L tot ) (e.g., Fig.11 In the first case 1110 and the second case 1120), the UE may be configured to have the ability to determine whether the UE can select a TRP (e.g., Fig.11 For example, the UE may be capable of configuring the total number of SD-based (L tot ) and / or the number of TRP configurations (N TRP ) value to determine the selected TRP. In some examples, the UE may select the total number of configurations (L) of the SD base tot ) is less than or equal to the SD base threshold (L thr)(For example, L tot ≤L thr ) determines the selection of TRP. For example, if the SD base threshold is set to four (e.g., L thr =4), then when the total number of SD-based configurations (L tot ) is less than or equal to four SD bases, the UE may determine to select TRP even if the network offers a choice of TRP. In some such scenarios, the UE may use Fig.11 The conditions of the second case 1120 continue.

[0203] Additionally, or alternatively, when the number of configurations of TRP (N TRP ) is greater than or equal to the TRP quantity threshold (N thr )(For example, N TRP ≥N thr ), even if the network provides a choice of TRP, the UE may determine that it is capable of selecting a TRP. For example, if the TRP number threshold is set to three (e.g., Nt hr =3), the UE can configure the number of TRPs (N TRP ) is greater than or equal to three TRPs. In some such scenarios, the UE may use Fig.11 The conditions of the second case 1120 continue.

[0204] Fig.13 is a diagram illustrating an example CSI report 1300 including a first CSI portion 1310 ("CSI portion 1") and a second CSI portion 1330 ("CSI portion 2") as presented herein. The configuration of the CSI report 1300 may be performed via a CJT CSI configuration such as Fig.10 The CJT CSI configuration 1010) configuration. Fig.13 In the example of , the CSI report 1300 includes one or more parameters (or fields) that facilitate indicating the number of SD bases. Fig.13 In the example, the indication may indicate an SD base selection performed jointly across all TRPs in the first CSI portion 1310.

[0205] exist Fig.13 In the illustrated example, the first CSI portion 1310 may be similar to Fig. 9 The first CSI part 910. For example, Fig.13 The first CSI part 1310 includes an RI field 1312 , a CQI field 1314 , and an NZC quantity field 1316 .

[0206] The first CSI portion 1310 also includes an SD basis selection field 1318. The SD basis selection field 1318 may indicate an SD basis selection performed jointly across all TRPs. It is understood that by indicating a selected SD basis, the SD basis selection field 1318 may also indicate a selected TRP. The SD basis selection field 1318 may indicate a selection from all N TRP N1N2 beams select the SD basis (L tot ). Select TRP in the network and configure the total number of selected SD bases L tot of Fig.11 In the first case 1110 of the embodiment, the UE may be configured to select at least one SD basis (e.g., L n ≥1). When the UE selects TRP Fig.11 In the second case 1120 of the UE, the UE may be configured to select a zero SD basis for any one of the selected TRPs (eg, allowing L n =0).

[0207] The size (eg, bit width) of the SD base selection field 1318 may be based on the configured number N of TRPs. TRP and the number of beams per TRP (N1N2). For example, the size of the SD base selection field 1318 can be Units digit.

[0208] exist Fig.13 In the illustrated example, the second CSI portion 1330 may be similar to Fig. 9 The second CSI part 930. For example, Fig.13 The second CSI part 1330 includes an FD basis selection field 1334, a strongest coefficient indication field 1336, a coefficient selection indication field 1338, and an NZC indication field 1340. The FD basis selection field 1334 may indicate the selected FD basis. Figure 7 In the example of a Mode 1 codebook of , the FD basis selection indicated by the FD basis selection field 1334 may be per TRP. Figure 7 In the example of a Mode 2 codebook), the FD base selection indicated by the FD base selection field 1334 is common to all TRPs. In some examples, it may be possible to configure a TRP group including more than one TRP, where the TRPs within the TRP group share the same FD base selection, such as a hybrid codebook between Mode 1 and Mode 2.

[0209] exist Fig.13In the illustrated example of , the size of the bitmap of all TRPs may be determined after decoding the first CSI part 1310, and the size of the bitmap of all TRPs may be associated with the coefficient selection indication field 1338 of the second CSI part 1330. Additionally, the size of the bitmap may be determined when the UE is using the FD joint codebook (e.g., Figure 7 Mode 2 codebook) and the specific number of TRPs (M n )(For example, Figure 7 The FD independent codebook option 2) is determined.

[0210] like Fig.13 As shown, the second CSI portion 1330 of the CSI report 1300 may exclude the SD base selection field 1332, such as Fig. 9 That is, since the first CSI part 1310 includes the SD basis selection field 1318, the UE can skip providing an indication of the selected beam in the second CSI part 1330.

[0211] Fig.14 is a diagram illustrating another example CSI report 1400 including a first CSI portion 1410 ("CSI portion 1") and a second CSI portion 1430 ("CSI portion 2") as presented herein. The configuration of the CSI report 1400 may be performed via a CJT CSI configuration such as Fig.10 The CJT CSI configuration 1010) configuration. Fig.14 In the example of , the CSI report 1400 includes one or more parameters (or fields) that facilitate indicating the number of SD bases. Fig.14 As shown in the example of , the TRP selection is reported in the first CSI part 1410, and the SD basis selection performed jointly across TRPs is reported in the second CSI part 1430. tot ) using the FD joint codebook (e.g., Figure 7 Mode 2 codebook), or using the selected FD basis (M n ) is a FD independent codebook common across TRPs (e.g., Option 1) (e.g., Figure 7 Mode 1 codebook), the UE can use Fig.14 Example CSI report 1400.

[0212] exist Fig.14 In the illustrated example, the first CSI part 1410 includes an RI field 1412, a CQI field 1414, an NZC number field 1416, and a TRP selection field 1418. The TRP selection field 1418 may indicate a configured number of TRPs (N TRP) selected N TRPs from the CJT communication. In some examples, the TRP selection field 1418 may be implemented as a bitmap-based TRP selection field. The bitmap-based TRP selection field may include a bitmap that includes a number (N) equal to the number of possible TRPs that can be used for CJT communication. TRP ). For example, for N TRP =4, the bitmap may include a set of 4 bits, each bit corresponding to a specific TRP in a set of four possible TRPs. As an example, a first value (e.g., "1") may indicate that the corresponding TRP is selected, and a second value (e.g., "0") may indicate that the corresponding TRP is not selected. As an example, the first bit of the bitmap may correspond to TRP A, the second bit of the bitmap may correspond to TRP B, the third bit of the bitmap may correspond to TRP C, and the fourth bit of the bitmap may correspond to TRP D. In such an example, the bitmap value {0101} may indicate that TRP B and TRP D are selected by the UE.

[0213] In some examples, when the UE is selecting a TRP, the first CSI portion 1410 may include a TRP selection field 1418, such as Fig.11 In some examples, when the network is selecting a TRP, the first CSI portion 1410 may exclude the TRP selection field 1418, such as Fig.11 As indicated by the first situation 1110 .

[0214] Similar to Fig. 9 An example second CSI portion 930, Fig.14 The example second CSI part 1430 includes an SD basis selection field 1432, an FD basis selection field 1434, a strongest coefficient indication field 1436, a coefficient selection indication field 1438 and an NZC indication field 1440.

[0215] The SD basis selection field 1432 may indicate that the SD basis (L tot The value of N may be determined by the base station after decoding the first CSI part 1410, such as in combination with Fig.10 The size (eg, bit width) of the SD base selection field 1432 may be based on the selected number of TRPs (N) and the number of beams per TRP (N1N2). For example, the size of the SD base selection field 1432 may be It is understood that the SD base selection field 1432 may implicitly indicate which N TRPs (N TRP ), and the selected number of SD bases (L for each TRP n=1, ..., N) n ).

[0216] The FD basis selection field 1434 may indicate the selected FD basis. Figure 7 In the example of a Mode 1 codebook of , the FD basis selection indicated by the FD basis selection field 1434 may be per TRP. Figure 7 In the example of a Mode 2 codebook), the FD basis selection indicated by the FD basis selection field 1434 is common to all TRPs. In some examples, it may be possible to configure a TRP group including more than one TRP, where the TRPs within the TRP group share the same FD basis selection, such as a hybrid codebook between Mode 1 and Mode 2.

[0217] exist Fig.14 In the illustrated example of , the size of the bitmap for all TRPs may be determined after decoding the first CSI part 1410, and the size of the bitmap for all TRPs may be associated with the coefficient selection indication field 1438 of the second CSI part 1430. Additionally, the size of the bitmap may be determined when the UE is employing a selected FD basis (M) with a common number of TRPs (such as when the UE is employing an FD joint codebook (e.g., Figure 7 Mode 2 codebook) or FD independent codebook (e.g., Figure 7 In the example where the UE is using the FD joint codebook, the number of selected FD bases may be the total number of selected FD bases (M tot In the example where the UE is adopting the first option of the FD independent codebook, the number of selected FD bases may be common to each TRP (M n ).

[0218] Fig.15 is a diagram illustrating another example CSI report 1500 including a first CSI portion 1510 ("CSI portion 1") and a second CSI portion 1530 ("CSI portion 2") as presented herein. The configuration of the CSI report 1500 may be performed via a CJT CSI configuration such as Fig.10 The CJT CSI configuration 1010) configuration. Fig.15 In the example of , the CSI report 1500 includes one or more parameters (or fields) that facilitate indicating the number of SD bases. Fig.15 As shown in the example of FIG. 15 , the TRP (N) for all configurations is reported in the first CSI part 1510. TRP ) of the selected basis (L n ), and report each TRP SD base selection in the second CSI part 1530.

[0219] exist Fig.15In the illustrated example, the first CSI part 1510 includes an RI field 1512, a CQI field 1514, an NZC number field 1516, and a selected SD basis number field 1518 per TRP. The selected SD basis number field 1518 per TRP indicates the number of SD bases selected for each TRP (L n ). Regardless of whether TRP selection by the UE is enabled (e.g. Fig.11 For both the first case 1110 and the second case 1120 of the embodiment, the number of selected SD bases per TRP field 1518 may be included. Additionally, for all configured TRPs (N TRP ), may include a selected SD basis number field 1518 per TRP so that the size of the first CSI part 1510 is fixed. In a scenario where the network selects a TRP (e.g., Fig.11 In the first case 1110 of , the value of the number of selected SD bases for each TRP included in the first CSI part 1510 is at least one. In the scenario where the UE can select a TRP (e.g., Fig.12 In the second case 1120), the value of the number of selected SD bases for TRP can be set to zero.

[0220] exist Fig.15 In the illustrated example, the second CSI part 1530 includes a per-TRP SD basis selection field 1532, which indicates the selected SD basis for each TRP. In the example of the first case 1110 where the network selects the TRP, the selected SD basis may be for each TRP, n=1, ..., N TRP In the example of the second case 1120 where the UE selects a TRP, the selected SD basis may be for each TRP, n=1, ..., N. In some examples, it may be possible to configure a TRP group including more than one TRP, where the TRPs within the TRP group share the same SD basis selection.

[0221] The size (eg, bit width) of the per-TRP SD basis selection field 1532 may be based on the number of beams per TRP (N1N2). For example, the size of the per-TRP SD basis selection field 1532 may be It will be appreciated that the number of beams per TRP (N1N2) may also indicate the number of ports per TRP (eg, per polarization).

[0222] like Fig.15 As shown, the second CSI part 1530 may also include an FD basis selection field 1534, a strongest coefficient indication field 1536, a coefficient selection indication field 1538, and an NZC indication field 1540. The FD basis selection field 1534 may indicate the selected FD basis. Figure 7In the example of a Mode 1 codebook of , the FD basis selection indicated by the FD basis selection field 1534 may be per TRP. Figure 7 In the example of a Mode 2 codebook), the FD basis selection indicated by the FD basis selection field 1534 is common to all TRPs. In some examples, it may be possible to configure a TRP group including more than one TRP, where the TRPs within the TRP group share the same FD basis selection, such as a hybrid codebook between Mode 1 and Mode 2.

[0223] exist Fig.15 In the illustrated example of , the size of the bitmap of all TRPs may be determined after decoding the first CSI part 1510, and the size of the bitmap of all TRPs may be associated with the coefficient selection indication field 1538 of the second CSI part 1530. Additionally, the size of the bitmap may be determined when the UE is using the FD joint codebook (e.g., Figure 7 Mode 2 codebook) and the specific number of TRPs (M n )(For example, Figure 7 The FD independent codebook option 2) is determined.

[0224] Fig.16 is a diagram illustrating another example CSI report 1600 including a first CSI portion 1610 ("CSI portion 1") and a second CSI portion 1630 ("CSI portion 2") as presented herein. The configuration of the CSI report 1600 may be performed via a CJT CSI configuration such as Fig.10 The CJT CSI configuration 1010) configuration. Fig.16 In the example of , the CSI report 1600 includes one or more parameters (or fields) that facilitate indicating the number of SD bases. Fig.16 As shown in the example, the TRP selection is reported in the first CSI part 1610 and the per-TRP SD basis selection is reported in the second CSI part 1630. Fig.16 The second CSI portion 1630 also indicates the number of selected SD bases (L) for all selected N TRPs. n ). When the FD basis (M tot ) using the FD joint codebook (e.g., Figure 7 Mode 2 codebook), or using the selected FD basis (M n ) is a FD independent codebook common across TRPs (e.g., Option 1) (e.g., Figure 7 Mode 1 codebook), the UE can use Fig.16 Example CSI report 1600.

[0225] exist Fig.16In the illustrated example, the first CSI part 1610 includes an RI field 1612, a CQI field 1614, an NZC number field 1616, and a TRP selection field 1618. The TRP selection field 1618 may indicate a configured number of TRPs (N TRP ) in the selected N TRPs. In some examples, the TRP selection field 1618 may be implemented as a bitmap-based TRP selection field. Aspects of the bitmap-based TRP selection field may be combined Fig.14 Description of the TRP selection field 1418.

[0226] In some examples, when the UE is selecting a TRP, the first CSI portion 1610 may include a TRP selection field 1618, such as Fig.11 In some examples, when the network is selecting a TRP, the first CSI portion 1610 may exclude the TRP selection field 1618, such as Fig.11 As indicated by the first situation 1110 .

[0227] exist Fig.16 In the illustrated example, the second CSI part 1630 includes a number of SD bases selected per TRP field 1631. The number of SD bases selected per TRP field 1631 indicates the number of SD bases selected for each TRP (L n ). Regardless of whether TRP selection by the UE is enabled (e.g. Fig.11 For both the first case 1110 and the second case 1120), each of the selected SD base number fields 1631 may be included. Additionally, for all configured TRPs (N TRP ), may include a selected SD base number field 1631 per TRP. In the scenario where the network selects a TRP (e.g., Fig.11 In the first case 1110), the value of the number of SD bases (L n ) is at least one. In a scenario where the UE can select a TRP (e.g., Fig.12 In the second case 1120), the value of the number of selected SD bases for TRP (L n ) can be set to zero.

[0228] exist Fig.16 In the illustrated example, the second CSI part 1630 includes a per-TRP SD basis selection field 1632, which indicates the selected SD basis for each TRP. In the example of the first case 1110 where the network selects the TRP, the selected SD basis may be for each TRP, n=1, ..., N TRPIn the example of the second case 1120 where the UE selects a TRP, the selected SD basis may be for each TRP, n=1, ..., N. In some examples, it may be possible to configure a TRP group including more than one TRP, where the TRPs within the TRP group share the same SD basis selection.

[0229] The size (eg, bit width) of the per-TRP SD basis selection field 1632 may be based on the number of beams per TRP (N1N2). For example, the size of the per-TRP SD basis selection field 1632 may be It will be appreciated that the number of beams per TRP (N1N2) may also indicate the number of ports per TRP (eg, per polarization).

[0230] like Fig.16 As shown, the second CSI part 1630 may also include an FD basis selection field 1634, a strongest coefficient indication field 1636, a coefficient selection indication field 1638, and an NZC indication field 1640. The FD basis selection field 1634 may indicate the selected FD basis. Figure 7 In the example of a Mode 1 codebook of , the FD basis selection indicated by the FD basis selection field 1634 may be per TRP. Figure 7 In the example of a Mode 2 codebook), the FD basis selection indicated by the FD basis selection field 1634 is common to all TRPs. In some examples, it may be possible to configure a TRP group including more than one TRP, where the TRPs within the TRP group share the same FD basis selection, such as a hybrid codebook between Mode 1 and Mode 2.

[0231] exist Fig.16 In the illustrated example of , the size of the bitmap of all TRPs may be determined after decoding the first CSI part 1610, and the size of the bitmap of all TRPs may be associated with the coefficient selection indication field 1638 of the second CSI part 1630. Additionally, the size of the bitmap may be determined when the UE is using the FD joint codebook (e.g., Figure 7 Mode 2 codebook) and the specific number of TRPs (M n )(For example, Figure 7 The FD independent codebook option 2) is determined.

[0232] Reference again Fig.11 Example table 1100, in some scenarios, the network may configure the number of SD bases (L) for each TRP n ), such as described in conjunction with the third case 1130 and the fourth case 1140. The number of SD bases (L) used for each TRP n) can be a common value (e.g., each TRP includes the same number of SD bases), or can be TRP-specific (e.g., the network indicates the number of SD bases to use for each TRP).

[0233] In TRP common L n In an example of a value, the network may provide a parameter combination indication indicating the common number of selected SD bases for each TRP (e.g., TRP common L n ), a first scaling factor (p) and a second scaling factor (β). Fig.17 A portion of a first table 1700 illustrating different combinations of parameters based on the value of a parameter combination indicator 1702 as presented herein is depicted. Fig.17 In the example of , when multiple TRP communications are employed, parameter combination indicator 1702 facilitates configuring the parameters of the CSI report at the UE. In some examples, the network may Fig.10 The CJT CSI configuration 1010 provides a parameter combination indicator 1702 .

[0234] exist Fig.17 In the example of FIG. 17 , the value of the parameter combination indicator 1702 may set the first parameter 1704 (L n ), the second parameter 1706 (p rank{1，2} ), the third parameter 1708 (p rank{3，4} ) and the value of the fourth parameter 1710 (β). Fig.17 , and similar to Figure 8 and Fig.12 For example, the value of the second parameter 1706 may be applied to rank 1 and rank 2, and the value of the third parameter 1708 may be applied to rank 3 and rank 4.

[0235] exist Fig.17 In the example of FIG. 17 , the value of the first parameter 1704 indicates the common number of selected SD bases for each TRP (eg, TRP common L n ).like Fig.17 As shown, TRP common L n The value of is at least one.

[0236] exist Fig.17 In the example of , the second parameter 1706 and the third parameter 1708 may be referred to as a first scaling factor (p), which may facilitate determining the number (M) of selected FD bases. Figure 8 and Fig.12In an example of, when the rank is 1 or 2, the UE may use the value of the second parameter 1706, and when the rank is 3 or 4, the UE may use the value of the third parameter 1708. In some examples, the first scaling factor (p) may be rank (pair) specific. Additionally, the UE may use a fourth parameter 1710 (e.g., a second scaling factor) to facilitate determining the maximum number (K0) of NZCs.

[0237] In TRP-specific L n In the example of a value of , the network may provide a parameter combination indication including a first scaling factor (p) and a second scaling factor (β), but excluding an indication of the number of selected SD bases. Fig.17 A portion of a second table 1720 illustrating different combinations of parameters based on the value of a parameter combination indicator 1722 as presented herein is depicted. Fig.17 In the example of , when multiple TRP communications are employed, parameter combination indicator 1722 facilitates configuring the parameters of the CSI report at the UE. In some examples, the network may Fig.10 The CJT CSI configuration 1010 provides a parameter combination indicator 1722 .

[0238] In the example of the second table 1720, the value of the parameter combination indicator 1722 may set the first parameter 1724 (prank{1,2 } )、Second parameter 1726(prank { 3, 4 } ) and the value of the third parameter 1728 (β). In the example of the second table 1720, and similar to Figure 8 and Fig.12 For example, the value of the first parameter 1724 can be applied to rank 1 and rank 2, and the value of the second parameter 1726 can be applied to rank 3 and rank 4.

[0239] exist Fig.17 In some such examples, the second table 1720 excludes an indication of the selected SD basis for each TRP. n ) may be configured by one or more separate parameters. For example, a first separate parameter may indicate the number of TRPs (e.g., N TRP =4). The second separate parameter may indicate the number of selected SD bases for each TRP. For example, the second separate parameter may indicate a bitmap value {2121}, which may indicate that the first TRP includes two selected SD bases (e.g., L1=2), the second TRP includes one selected SD base (e.g., L2=1), the third TRP includes two selected SD bases (e.g., L3=2), and the fourth TRP includes one selected SD base (e.g., L4=1).

[0240] Similar to Fig.17In the example of the first table 1700, in the example of the second table 1720, the first parameter 1724 and the second parameter 1726 may be referred to as a first scaling factor (p), which may facilitate determining the number (M) of selected FD bases. Figure 8 and Fig.12 In an example of, when the rank is 1 or 2, the UE may use the value of the first parameter 1724, and when the rank is 3 or 4, the UE may use the value of the second parameter 1726. In some examples, the first scaling factor (p) may be rank (pair) specific. Additionally, the UE may use a third parameter 1728 (e.g., a second scaling factor) to facilitate determining the maximum number (K0) of NZCs.

[0241] In some examples, for any TRP common L n value or for TRP specific L n By determining the first scaling factor (p) based on the number of selected TRPs (N), the CSI payload size (e.g., for the first CSI part) may be similar for different values ​​of the selected TRP (N).

[0242] Fig.17 A portion of a third table 1740 illustrating different combinations of parameters based on the value of a parameter combination indicator 1742 as presented herein is depicted. Fig.17 In the example of , when multi-TRP communication is adopted, the parameter combination indicator 1742 facilitates configuring the parameters of the CSI report at the UE. In some examples, the network can Fig.10 The CJT CSI configuration 1010 provides a parameter combination indicator 1742 .

[0243] In the example of the third table 1740, the value of the parameter combination indicator 1742 may set the first parameter 1746 (p rank{1，2} ), the second parameter 1748 (p rank{1，2} ), the third parameter 1750 (p rank{3，4} ), the fourth parameter 1752 (p rank{3，4} ) and the value of the fifth parameter 1754 (β). The parameter combination indicator 1742 can also be based on whether the parameter combination indicator 1742 is common with the TRP. n Associated (such as combined Fig.17 1700) or with TRP-specific L n Associated (such as combined Fig.17 1720) to indicate the sixth parameter 1744 (L n ) value.

[0244] In the example of the third table 1740, the first parameter 1746 and the second parameter 1748 may be applied to rank 1 and rank 2, respectively. However, when the number of TRPs is 1 or 2 (e.g., the number of TRPs = {1, 2}), the first parameter 1746 may be applied, and when the number of TRPs is 3 or 4 (e.g., the number of TRPs = {3, 4}), the second parameter 1748 may be applied. Additionally, the third parameter 1750 and the fourth parameter 1752 may be applied to rank 3 and rank 4, respectively. However, when the number of TRPs is 1 or 2 (e.g., the number of TRPs = {1, 2}), the third parameter 1750 may be applied, and when the number of TRPs is 3 or 4 (e.g., the number of TRPs = {3, 4}), the fourth parameter 1752 may be applied.

[0245] In the example of the third table 1740, the first parameter 1746, the second parameter 1748, the third parameter 1750, and the fourth parameter 1752 may facilitate determining the number of selected FD bases (M) based on, for example, the rank and the number of TRPs. Additionally, the UE may use the third parameter 1750 (e.g., the second scaling factor) to facilitate determining the maximum number of NZCs (K0).

[0246] Despite Fig.17 Although not shown in the example of FIG. 1 , it is understood that the determination of the number of selected FD groups (M) and the maximum number of NZCs (K0) can be based on the combination of Fig.11 The UE may be calculated using the techniques described in the first case 1110 and the second case 1120 of . For example, the UE may determine the number of selected FD bases (M) and the maximum number of NZCs (K0) using equations 8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b, 12a, 12b, 13, 14, 15, 16, and / or 17 based on whether the network selects the TRP (e.g., the third case 1130) or the UE selects the TRP (e.g., the fourth case 1140).

[0247] Fig.18 is a diagram illustrating another example CSI report 1800 including a first CSI portion 1810 ("CSI portion 1") and a second CSI portion 1830 ("CSI portion 2") as presented herein. The configuration of the CSI report 1800 may be performed via a CJT CSI configuration such as Fig.10 The CJT CSI configuration 1010) configuration. Fig.18 In the example of , the CSI report 1800 includes one or more parameters (or fields) that facilitate indicating the SD basis selection for each TRP. Fig.18 As shown in the example of , the TRP selection is reported in the first CSI part 1810, and the per-TRP SD basis selection is reported in the second CSI part 1830. tot ) using the FD joint codebook (e.g., Figure 7 Mode 2 codebook), or using the selected FD basis (M n ) is a FD independent codebook common across TRPs (e.g., Option 1) (e.g., Figure 7 Mode 1 codebook), the UE can use Fig.18 Example CSI report 1800.

[0248] exist Fig.18 In the illustrated example, the first CSI part 1810 includes an RI field 1812, a CQI field 1814, an NZC number field 1816, and a TRP selection field 1818. The TRP selection field 1818 may indicate a configured number of TRPs (N TRP ) in the selected N TRPs. In some examples, the TRP selection field 1818 may be implemented as a bitmap-based TRP selection field. Aspects of the bitmap-based TRP selection field may be combined Fig.14 Description of the TRP selection field 1418.

[0249] In some examples, when the UE is selecting a TRP, the first CSI portion 1810 may include a TRP selection field 1818, such as Fig.11 In some examples, when the network is selecting a TRP, the first CSI portion 1810 may exclude the TRP selection field 1818, such as Fig.11 As indicated by the third situation 1130.

[0250] exist Fig.18 In the illustrated example, the second CSI portion 1830 includes a per-TRP SD basis selection field 1832, which indicates the selected SD basis for each TRP. In the example of the third case 1130 where the network selects the TRP, the selected SD basis may be for each TRP, n=1, ..., N TRP In the example of the fourth case 1140 where the UE selects a TRP, the selected SD base may be for each TRP, n=1, ..., N. In some examples, it may be possible to configure a TRP group including more than one TRP, where the TRPs within the TRP group share the same SD base selection.

[0251] The size (eg, bit width) of the per-TRP SD basis selection field 1832 may be based on the number of beams per TRP (N1N2). For example, the size of the per-TRP SD basis selection field 1832 may be It will be appreciated that the number of beams per TRP (N1N2) may also indicate the number of ports per TRP (eg, per polarization).

[0252] like Fig.18As shown, the second CSI part 1630 may also include an FD basis selection field 1834, a strongest coefficient indication field 1836, a coefficient selection indication field 1838, and an NZC indication field 1840. The FD basis selection field 1834 may indicate the selected FD basis. Figure 7 In the example of a Mode 1 codebook of , the FD basis selection indicated by the FD basis selection field 1834 may be per TRP. Figure 7 In the example of a Mode 2 codebook), the FD basis selection indicated by the FD basis selection field 1834 is common to all TRPs. In some examples, it may be possible to configure a TRP group including more than one TRP, where the TRPs within the TRP group share the same FD basis selection, such as a hybrid codebook between Mode 1 and Mode 2.

[0253] Fig.19 1900 is a flow chart of a method of wireless communication. The method may be performed by a UE (e.g., UE 104 and / or Fig.21 The method may facilitate indicating the number of SD bases, which may improve communication performance in scenarios where multiple TRP communications are used. For example, when using Fig.10 The first configuration and / or Fig.11 In the first case 1110 and / or the second case 1120, the method can be used by the UE.

[0254] At 1902, the UE sends information indicating the number of SD bases for each TRP in the set of TRPs, such as at least in conjunction with Fig.10 The information indicating the number of SD bases sent at 1902 may be provided by Fig.21 The cellular RF transceiver 2122 / reporting component 198 of the device 2104 executes.

[0255] At 1904, the UE receives downlink communications from at least a subset of the TRPs in the set of TRPs based on the transmitted information, such as in combination with at least Fig.10 The downlink communication 1070 is described. The downlink communication received at 1904 may be Fig.21 The cellular RF transceiver 2122 / reporting component 198 of the device 2104 executes.

[0256] In some examples, the UE may determine a number of FD bases for each TRP in the set of TRPs based on at least one of a number of SD bases for each TRP in the set of TRPs or a number of TRPs in the set of TRPs, as described at least in conjunction with Equations 8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b, 12a, and / or 12b. In some such examples, receiving downlink communications from at least a subset of the TRPs at 1904 may also be based on the determined number of FD bases for each TRP in the set of TRPs.

[0257] In some examples, the determined number of FD bases for each TRP in the set of TRPs may be the same number, such as in conjunction with at least a FD joint codebook (eg, a Mode 2 codebook) and / or a TRP common M. n The scenario (e.g., option 1 of FD independent codebook or mode 1 codebook) is described.

[0258] In some examples, the determined number of FD bases for each TRP in the set of TRPs may be a specific number for each respective TRP, such as at least in conjunction with a TRP-specific M n The scenario (e.g., FD independent codebook or option 2 of mode 1 codebook) is described.

[0259] In some examples, the sum of each number of SD bases for each TRP in the set of TRPs may be equal to the total number of SD bases L tot , and wherein the information sent (e.g., at 1902) also includes the actual number L of SD bases tot，actual , the actual number of SD bases may be less than the total number of SD bases L tot , such as at least combining Fig.11 The second situation 1120 is described.

[0260] In some examples, the information sent (eg, at 1902) may indicate that the number of SD bases for each TRP in the set of TRPs is at least one, such as in combination with at least Fig.11 The first situation 1110 is described.

[0261] In some examples, the information sent (eg, at 1902) may indicate that the number of SD bases for one or more TRPs in the set of TRPs is equal to 0, such as in conjunction with at least Fig.11 The second situation 1120 is described.

[0262] In some examples, the UE may determine a maximum number of NZCs for the set of TRPs based on at least one of a number of SD bases for each TRP in the set of TRPs or a total number of TRPs in the set of TRPs, as described at least in conjunction with Equations 13, 14, 15, and / or 16. In some such examples, receiving downlink communications from at least a subset of the TRPs (e.g., at 1904) may also be based on the determined maximum number of NZCs for the set of TRPs.

[0263] In some examples, the information sent (e.g., at 1902) may include a CSI part 1 that includes a maximum number of RI, CQI, NZC, and an indication of an SD basis selected jointly across a set of TRPs associated with a number of SD basis for each TRP in the set of TRPs, such as in combination with at least Fig.13 An example CSI report 1300 is described.

[0264] In some examples, the information sent (e.g., at 1902) may include CSI part 1 and CSI part 2, wherein CSI part 1 includes a maximum number of RIs, CQIs, NZCs, and a TRP selection indicating a selected TRP in a set of TRPs, and wherein CSI part 2 includes at least an indication of an SD basis selected jointly across the selected TRPs associated with a number of SD basis for each TRP in the selected TRPs, such as in combination with at least Fig.14 An example CSI report 1400 is described.

[0265] In some examples, the information sent (e.g., at 1902) may include CSI part 1 and CSI part 2, wherein CSI part 1 includes a maximum number of RI, CQI, NZC, and a number of SD bases for each TRP in a set of TRPs, and wherein CSI part 2 includes a per-TRP SD base selection for each TRP in a set of TRPs or a selected TRP in a set of TRPs, such as in combination with at least Fig.15 An example CSI report 1500 is described.

[0266] In some examples, the information sent (e.g., at 1902) may include CSI part 1 and CSI part 2, wherein CSI part 1 includes a maximum number of RI, CQI, NZC, and a TRP selection indicating a selected TRP in a set of TRPs, and wherein CSI part 2 includes at least a number of SD bases for each TRP in a selected TRP in a set of TRPs and a per-TRP SD base selection for a selected TRP in a set of TRPs, such as in combination with at least Fig.16 An example CSI report 1600 is described.

[0267] Fig. 202000 is a flowchart of a method of wireless communication. The method may be performed by a UE (eg, UE 104 and / or Fig.21 The method may facilitate sending a CSI report based on the received information indicating the number of SD bases, which may improve communication performance in scenarios where multiple TRP communications are employed. For example, when using Fig.10 The second configuration and / or Fig.11 In the third case 1130 and / or the fourth case 1140, the method can be used by the UE.

[0268] At 2002, the UE receives information indicating the number of SD bases for each TRP in the set of TRPs, such as at least in conjunction with Fig.10 The received information may not be associated with a first parameter indicating the number of FD bases and a second parameter indicating the maximum number of NZCs. In some examples, the first parameter may be based on the number of TRPs in the set of TRPs. The information indicating the number of SD bases received at 2002 may be Fig.21 The cellular RF transceiver 2122 / reporting component 198 of the device 2104 executes.

[0269] At 2004, the UE sends a CSI report based on the received information, such as at least in conjunction with Fig.10 CSI Report 1050 and / or Fig.18 The CSI report 1800 is described. The CSI report sent at 2004 may be Fig.21 The cellular RF transceiver 2122 / reporting component 198 of the device 2104 executes.

[0270] In some examples, the CSI report at 2004 includes CSI part 1 and CSI part 2, wherein CSI part 1 includes RI, CQI, maximum number of NZCs and TRP selection indicating a selected TRP in a set of TRPs, and wherein CSI part 2 includes at least a per-TRP SD basis selection for a selected TRP in a set of TRPs, such as in combination with Fig.18 An example CSI report 1800 is described.

[0271] Fig.2121 is a diagram illustrating an example of a hardware implementation for an apparatus 2104. The apparatus 2104 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus 2104 may include a cellular baseband processor 2124 (also referred to as a modem) coupled to one or more transceivers (e.g., a cellular RF transceiver 2122). The cellular baseband processor 2124 may include on-chip memory 2124'. In some aspects, the apparatus 2104 may also include one or more subscriber identity module (SIM) cards 2120 and an application processor 2106 coupled to a secure digital (SD) card 2108 and a screen 2110. The application processor 2106 may include on-chip memory 2106'. In some aspects, the device 2104 may also include a Bluetooth module 2112, a WLAN module 2114, an SPS module 2116 (e.g., a GNSS module), one or more sensor modules 2118 (e.g., an atmospheric pressure sensor / altimeter; a motion sensor such as an inertial measurement unit (IMU), a gyroscope, and / or an accelerometer; light detection and ranging (LIDAR), radio-aided detection and ranging (RADAR), sound navigation and ranging (SONAR), a magnetometer, audio, and / or other technologies for positioning), an additional memory module 2126, a power source 2130, and / or a camera 2132. The Bluetooth module 2112, the WLAN module 2114, and the SPS module 2116 may include an on-chip transceiver (TRX) (or in some cases, only a receiver (RX)). The Bluetooth module 2112, the WLAN module 2114, and the SPS module 2116 may include their own dedicated antennas and / or communicate using one or more antennas 2180. The cellular baseband processor 2124 communicates with the UE 104 and / or with the RU associated with the network entity 2102 via one or more antennas 2180 through a transceiver (e.g., a cellular RF transceiver 2122). The cellular baseband processor 2124 and the application processor 2106 may each include a computer-readable medium / memory, such as an on-chip memory 2124' and an on-chip memory 2106', respectively. The attached memory module 2126 may also be considered a computer-readable medium / memory. Each computer-readable medium / memory (e.g., on-chip memory 2124', on-chip memory 2106', and / or attached memory module 2126) may be non-transitory. The cellular baseband processor 2124 and the application processor 2106 are each responsible for general processing, including executing software stored on a computer-readable medium / memory. The software, when executed by the cellular baseband processor 2124 / application processor 216, enables the cellular baseband processor 2124 / application processor 2106 to perform the various functions described above. The computer-readable medium / memory may also be used to store data that is manipulated by the cellular baseband processor 2124 / application processor 2106 when executing software.The cellular baseband processor 2124 / application processor 2106 may be a component of the UE 350 and may include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the device 2104 may be a processor chip (modem and / or application) and include only the cellular baseband processor 2124 and / or the application processor 2106, while in another configuration, the device 2104 may be the entire UE (e.g., see. Figure 3 UE 350) and includes additional modules of device 2104.

[0272] As discussed above, the reporting component 198 is configured to send information indicating the number of SD bases for each TRP in the set of TRPs. The reporting component 198 may also be configured to receive downlink communications from at least a subset of the TRPs in the set of TRPs based on the sent information. In another configuration, the reporting component 198 may be configured to receive information indicating the number of SD bases for each TRP in the set of TRPs, the received information not associated with a first parameter indicating the number of FD bases and a second parameter indicating the maximum number of NZCs. The reporting component 198 may also be configured to send a CSI report based on the received information.

[0273] The reporting component 198 may be within the cellular baseband processor 2124, the application processor 2106, or both the cellular baseband processor 2124 and the application processor 2106. The reporting component 198 may be one or more hardware components specifically configured to perform the stated processes / algorithms, implemented by one or more processors configured to perform the stated processes / algorithms, stored in a computer-readable medium for implementation by one or more processors, or some combination thereof.

[0274] As shown, the device 2104 may include various components configured for various functions. For example, the reporting component 198 may include an execution Fig.19 and / or Fig. 20 Each block of the algorithm in the flowchart is one or more hardware components.

[0275] In one configuration, the apparatus 2104, and in particular the cellular baseband processor 2124 and / or the application processor 2106, includes means for transmitting information indicating the number of SD bases for each TRP in the set of TRPs. The example apparatus 2104 also includes means for receiving downlink communications from at least a subset of the TRPs in the set of TRPs based on the transmitted information.

[0276] In another configuration, the example apparatus 2104 further includes means for determining a number of FD bases for each TRP in the set of TRPs based on at least one of a number of SD bases for each TRP in the set of TRPs or a number of TRPs in the set of TRPs.

[0277] In another configuration, the example apparatus 2104 further includes means for determining a maximum number of NZCs for a set of TRPs based on at least one of a number of SD bases for each TRP in the set of TRPs or a total number of TRPs in the set of TRPs.

[0278] In another configuration, the example apparatus 2104 includes means for receiving information indicating a number of SD bases for each TRP in a set of TRPs, the received information not being associated with a first parameter indicating a number of FD bases and a second parameter indicating a maximum number of NZCs. The example apparatus 2104 also includes means for sending a CSI report based on the received information.

[0279] The means may be the reporting component 198 of the apparatus 2104 configured to perform the functions recited by these means. As described above, the apparatus 2104 may include the TX processor 368, the RX processor 356, and the controller / processor 359. Thus, in one configuration, the means may be the TX processor 368, the RX processor 356, and / or the controller / processor 359 configured to perform the functions recited by the means.

[0280] In a multi-TRP communication system, a network entity and a UE may communicate with each other by transmitting communications using one or more of the multiple TRPs. In an example where the network entity and the UE are operating in a multi-TRP communication mode, when performing a channel state feedback procedure, the UE may generate CSI for one or more of the TRPs. Therefore, it can be understood that as the number of TRPs increases, the size of the CSI report will also increase.

[0281] The various aspects disclosed herein provide techniques for improving communication performance in scenarios employing multi-TRP communication, for example, by improving CSI acquisition for CJT communication. For example, the various aspects disclosed herein enable the UE to select the number of SD bases, the number of FD bases, and the number of NZCs to include in a CSI report to the network. In some aspects disclosed herein, the UE may send information indicating the number of SD bases for each TRP in a set of TRPs. The UE may indicate the number of SD bases in CSI part 1 of the CSI report or in CSI part 2 of the CSI report. The UE may then receive downlink communications from at least a subset of the TRPs in the set of TRPs. In another aspect disclosed herein, the UE may receive information indicating the number of SD bases for each TRP in the set of TRPs. The received information may not be associated with a first parameter indicating the number of FD bases and a second parameter indicating the maximum number of NZCs. The UE may also send a CSI report based on the received information. The UE may include an indication of the selected TRP in CSI part 1 of the CSI report, and include an indication of the selection of the SD base per TRP in CSI part 2 of the CSI report.

[0282] It should be understood that the specific order or hierarchy of the blocks in the disclosed process / flowchart is merely an illustration of the exemplary method. It should be understood that the specific order or hierarchy of the blocks in the process / flowchart may be rearranged based on design preferences. Further, some blocks may be combined or omitted. The attached method claims provide the elements of the various blocks in a sample order, but are not limited to the specific order or hierarchy provided.

[0283] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not limited to the various aspects described herein, but should be given the full scope consistent with the language claims. Unless otherwise specified, reference to an element in the singular form does not mean "one and only one", but "one or more". Terms such as "if", "when" and "while" do not mean a direct temporal relationship or reaction. That is, these phrases, such as "when ......", do not mean instant action in response to the occurrence of an action or during the occurrence of an action, but simply imply that if the conditions are met, the action will occur, but no specific or instant time limit for the occurrence of the action is required. The word "exemplary" is used herein to mean "used as an example, instance, or illustration". Any aspect described as "exemplary" herein is not necessarily interpreted as being preferred or having advantages over other aspects. Unless otherwise specified, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" include any combination of A, B, and / or C, which may include multiple A, multiple B, or multiple C. Specifically, combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, where any such combination may contain one or more members of A, B, or C. A set should be interpreted as a set of elements, where the number of elements is one or more. Thus, for a set of X, X will include one or more elements. If the first device receives data from the second device or sends data to the second device, data can be directly received / sent between the first device and the second device, or data can be indirectly received / sent between the first device and the second device through a collection of devices. All structural and functional equivalents that are known or will be known later to those of ordinary skill in the art throughout the elements of the various aspects described in this disclosure are expressly incorporated herein by reference and are covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly recorded in the claims. Words such as "module", "mechanism", "element", "device" cannot replace the word "component". Therefore, no claim element will be understood as a component plus function unless the element is explicitly recorded using the phrase "component for...".

[0284] As used herein, the phrase "based on" should not be interpreted as referring to a closed set of information, one or more conditions, one or more factors, etc. In other words, the phrase "based on A" (where "A" can be information, a condition, a factor, etc.) should be interpreted as "based at least on A" unless specifically stated differently.

[0285] The following aspects are merely illustrative and may be combined with other aspects or teachings described herein without limitation.

[0286] Aspect 1 is a method for performing wireless communications at a UE, comprising: sending information indicating the number of spatial domain (SD) bases for each TRP in a set of transmit receive points (TRPs); and receiving downlink communications from at least a subset of the TRPs in the set of TRPs based on the sent information.

[0287] Aspect 2 is a method according to Aspect 1, further comprising: determining the number of frequency domain (FD) bases for each TRP in the set of TRPs based on at least one of the number of SD bases for each TRP in the set of TRPs or the number of TRPs in the set of TRPs, wherein receiving the downlink communication from at least the subset of TRPs is also based on the determined number of FD bases for each TRP in the set of TRPs.

[0288] Aspect 3 is a method according to Aspect 2, further comprising the determined number of FD bases for each TRP in the set of TRPs being the same number.

[0289] Aspect 4 is a method according to Aspect 2, further comprising the determined number of FD bases for each TRP in the set of TRPs being a specific number for each corresponding TRP.

[0290] Aspect 5 is a method according to any one of aspects 1 to 4, further comprising: the sum of each number of SD bases for each TRP in the set of TRPs is equal to the total number of SD bases L tot , and the information sent also includes the actual number of SD bases L tot，actual , the actual number of SD bases is less than the total number L of SD bases tot .

[0291] Aspect 6 is a method according to any one of Aspects 1 to 5, further comprising the information sent indicating that the number of SD bases for each TRP in the set of TRPs is at least one.

[0292] Aspect 7 is a method according to any one of Aspects 1 to 5, further comprising the information sent indicating that the number of SD bases for one or more TRPs in the set of TRPs is equal to 0.

[0293] Aspect 8 is a method according to any one of Aspects 1 to 7, further comprising: determining a maximum number of non-zero coefficients (NZC) for the set of TRPs based on at least one of the number of SD bases for each TRP in the set of TRPs or the total number of TRPs in the set of TRPs, wherein receiving the downlink communication from at least the subset of TRPs is also based on the determined maximum number of NZCs for the set of TRPs.

[0294] Aspect 9 is a method according to any one of Aspects 1 to 8, further comprising the information transmitted including a channel state information (CSI) part 1, the CSI part 1 including a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and an indication of an SD base selected jointly across the set of TRPs associated with the number of SD bases for each TRP in the set of TRPs.

[0295] Aspect 10 is a method according to any one of Aspects 1 to 8, further comprising the information transmitted comprising a channel state information (CSI) part 1 and a CSI part 2, wherein the CSI part 1 comprises a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and a TRP selection indicating a selected TRP in the set of TRPs, wherein the CSI part 2 comprises at least an indication of an SD base selected jointly across the selected TRPs associated with the number of SD bases used for each TRP in the selected TRPs.

[0296] Aspect 11 is a method according to any one of Aspects 1 to 8, further comprising the information transmitted including a channel state information (CSI) part 1 and a CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and the number of SD bases for each TRP in the set of TRPs, and wherein the CSI part 2 includes a per-TRP SD basis selection for each TRP in the set of TRPs or a selected TRP in the set of TRPs.

[0297] Aspect 12 is a method according to any one of Aspects 1 to 8, further comprising the information transmitted including a channel state information (CSI) part 1 and a CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC) and a TRP selection indicating a selected TRP in the set of TRPs, wherein the CSI part 2 includes at least the number of SD bases for each TRP in the selected TRP in the set of TRPs and a per-TRP SD base selection for the selected TRP in the set of TRPs.

[0298] Aspect 13 is an apparatus for wireless communication at a UE, comprising at least one processor coupled to a memory and configured to implement any one of aspects 1 to 12.

[0299] In aspect 14, the apparatus according to aspect 13 further comprises at least one antenna coupled to the at least one processor.

[0300] In aspect 15, the apparatus according to aspect 13 or 14 further comprises a transceiver coupled to the at least one processor.

[0301] Aspect 16 is an apparatus for wireless communication, comprising means for implementing any one of aspects 1 to 12.

[0302] In aspect 17, the apparatus according to aspect 16 further comprises at least one antenna coupled to the means for performing the method according to any one of aspects 1 to 12.

[0303] In aspect 18, the apparatus according to aspect 16 or 17 further comprises a transceiver coupled to the means for performing the method according to any one of aspects 1 to 12.

[0304] Aspect 19 is a non-transitory computer-readable storage medium storing computer-executable code, wherein the code, when executed, causes a processor to implement any one of aspects 1 to 12.

[0305] Aspect 20 is a method for performing wireless communication at a UE, comprising: receiving information indicating the number of spatial domain (SD) bases for each TRP in a set of transmit receive points (TRPs), the received information being not associated with a first parameter indicating the number of frequency domain (FD) bases and a second parameter indicating the maximum number of non-zero coefficients (NZC); and sending a channel state information (CSI) report based on the received information.

[0306] Aspect 21 is a method according to Aspect 20, further comprising the first parameter being based on the number of TRPs in the set of TRPs.

[0307] Aspect 22 is a method according to any one of Aspects 20 and 21, further comprising the CSI report comprising CSI part 1 and CSI part 2, wherein the CSI part 1 comprises a rank indicator (RI), a channel quality indicator (CQI), a total number of NZCs and a TRP selection indicating a selected TRP in the set of TRPs, wherein the CSI part 2 comprises at least a per-TRP SD basis selection for the selected TRP in the set of TRPs.

[0308] Aspect 23 is an apparatus for wireless communication at a UE, comprising at least one processor coupled to a memory and configured to implement any one of aspects 20 to 22.

[0309] In aspect 24, the apparatus according to aspect 23 further comprises at least one antenna coupled to the at least one processor.

[0310] In aspect 25, the apparatus according to aspect 23 or 24 further comprises a transceiver coupled to the at least one processor.

[0311] Aspect 26 is an apparatus for wireless communication, comprising means for implementing any one of aspects 20 to 22.

[0312] In aspect 27, the apparatus according to aspect 26 further comprises at least one antenna coupled to the means for performing the method according to any one of aspects 20 to 22.

[0313] In aspect 28, the apparatus according to aspect 26 or 27 further comprises a transceiver coupled to the means for performing the method according to any one of aspects 20 to 22.

[0314] Aspect 29 is a non-transitory computer-readable storage medium storing computer-executable code, wherein the code, when executed, causes a processor to implement any one of aspects 20 to 22.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; and at least one processor coupled to the memory and based at least in part on the information stored in the memory, the at least one processor configured to: transmitting information indicating the number of spatial domain (SD) bases for each TRP in a set of transmit reception points (TRPs); and Downlink communications are received from at least a subset of the TRPs in the set of TRPs based on the sent information.

2. An apparatus according to claim 1, wherein the at least one processor is further configured to determine the number of frequency domain (FD) bases for each TRP in the set of TRPs based on at least one of the number of SD bases for each TRP in the set of TRPs or the number of TRPs in the set of TRPs, wherein the at least one processor is configured to receive the downlink communication from at least the subset of TRPs also based on the determined number of FD bases for each TRP in the set of TRPs.

3. An apparatus according to claim 2, wherein the determined number of FD bases for each TRP in the set of TRPs is the same number.

4. An apparatus according to claim 2, wherein the determined number of FD bases for each TRP in the set of TRPs is a specific number for each corresponding TRP.

5. The apparatus of claim 1, wherein the sum of each number of SD bases for each TRP in the set of TRPs is equal to the total number L of SD bases. tot , and the information sent also includes the actual number of SD bases L tot，actual , the actual number of SD bases is less than the total number L of SD bases tot .

6. An apparatus according to claim 1, wherein the information sent indicates that the number of SD bases for each TRP in the set of TRPs is at least one.

7. An apparatus according to claim 1, wherein the information sent indicates that the number of SD bases for one or more TRPs in the set of TRPs is equal to 0.

8. An apparatus according to claim 1, wherein the at least one processor is further configured to determine a maximum number of non-zero coefficients (NZC) for the set of TRPs based on at least one of the number of SD bases for each TRP in the set of TRPs or the total number of TRPs in the set of TRPs, wherein the at least one processor is configured to receive the downlink communication from the at least the subset of TRPs also based on the determined maximum number of NZCs for the set of TRPs.

9. An apparatus according to claim 1, wherein the information sent includes a channel state information (CSI) part 1, the CSI part 1 including a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and an indication of an SD base selected jointly across the set of TRPs associated with the number of SD bases for each TRP in the set of TRPs.

10. An apparatus according to claim 1, wherein the transmitted information includes a channel state information (CSI) part 1 and a CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and a TRP selection indicating a selected TRP in the set of TRPs, wherein the CSI part 2 includes at least an indication of an SD basis selected jointly across the selected TRPs associated with the number of SD bases used for each TRP in the selected TRPs.

11. An apparatus according to claim 1, wherein the transmitted information includes a channel state information (CSI) part 1 and a CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and the number of SD bases for each TRP in the set of TRPs, and wherein the CSI part 2 includes a per-TRP SD basis selection for each TRP in the set of TRPs or a selected TRP in the set of TRPs.

12. An apparatus according to claim 1, wherein the transmitted information includes a channel state information (CSI) part 1 and a CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and a TRP selection indicating a selected TRP in the set of TRPs, wherein the CSI part 2 includes at least the number of SD bases for each TRP in the selected TRP in the set of TRPs and a per-TRP SD base selection for the selected TRP in the set of TRPs.

13. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; and at least one processor coupled to the memory and based at least in part on the information stored in the memory, the at least one processor configured to: receiving information indicating a number of spatial domain (SD) bases for each TRP in a set of transmit reception points (TRPs), the received information being unassociated with a first parameter indicating a number of frequency domain (FD) bases and a second parameter indicating a maximum number of non-zero coefficients (NZC); as well as A channel state information (CSI) report is sent based on the received information.

14. The apparatus of claim 13, wherein the first parameter is based on a number of TRPs in the set of TRPs.

15. An apparatus according to claim 13, wherein the CSI report includes CSI part 1 and CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of NZCs, and a TRP selection indicating a selected TRP in the set of TRPs, and wherein the CSI part 2 includes at least a per-TRP SD basis selection for the selected TRP in the set of TRPs.

16. A method of wireless communication at a user equipment (UE), comprising: transmitting information indicating a number of spatial domain (SD) bases for each TRP in a set of transmit reception points (TRPs); as well as Downlink communications are received from at least a subset of the TRPs in the set of TRPs based on the sent information.

17. The method of claim 16, further comprising determining a number of frequency domain (FD) bases for each TRP in the set of TRPs based on at least one of the number of SD bases for each TRP in the set of TRPs or the number of TRPs in the set of TRPs, wherein receiving the downlink communication from at least the subset of TRPs is also based on the determined number of FD bases for each TRP in the set of TRPs.

18. The method of claim 17, wherein the determined number of FD bases for each TRP in the set of TRPs is the same number.

19. The method of claim 17, wherein the determined number of FD bases for each TRP in the set of TRPs is a specific number for each corresponding TRP.

20. The method of claim 16, wherein the sum of each number of SD bases for each TRP in the set of TRPs is equal to the total number of SD bases L tot , and the information sent also includes the actual number of SD bases L tot,actual , the actual number of SD bases is less than the total number L of SD bases tot .

21. The method of claim 16, wherein the information sent indicates that the number of SD bases for each of the TRPs in the set of TRPs is at least one.

22. The method of claim 16, wherein the information sent indicates that the number of SD bases for one or more TRPs in the set of TRPs is equal to 0.

23. The method according to claim 16 also includes determining a maximum number of non-zero coefficients (NZC) for the set of TRPs based on at least one of the number of SD bases for each TRP in the set of TRPs or the total number of TRPs in the set of TRPs, wherein receiving the downlink communication from at least the subset of TRPs is also based on the determined maximum number of NZCs for the set of TRPs.

24. A method according to claim 16, wherein the information sent includes a channel state information (CSI) part 1, the CSI part 1 including a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and an indication of an SD base selected jointly across the set of TRPs associated with the number of SD bases for each TRP in the set of TRPs.

25. A method according to claim 16, wherein the information sent includes a channel state information (CSI) part 1 and a CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and a TRP selection indicating a selected TRP in the set of TRPs, wherein the CSI part 2 includes at least an indication of an SD basis selected jointly across the selected TRPs associated with the number of SD bases used for each TRP in the selected TRPs.

26. A method according to claim 16, wherein the information sent includes a channel state information (CSI) part 1 and a CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC), and the number of SD bases for each TRP in the set of TRPs, and wherein the CSI part 2 includes a per-TRP SD basis selection for each TRP in the set of TRPs or a selected TRP in the set of TRPs.

27. A method according to claim 16, wherein the information sent includes a channel state information (CSI) part 1 and a CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of non-zero coefficients (NZC) and a TRP selection indicating a selected TRP in the set of TRPs, wherein the CSI part 2 includes at least the number of SD bases for each TRP in the selected TRP in the set of TRPs and a per-TRP SD base selection for the selected TRP in the set of TRPs.

28. A method of wireless communication at a user equipment (UE), comprising: receiving information indicating a number of spatial domain (SD) bases for each TRP in a set of transmit reception points (TRPs), the received information being unassociated with a first parameter indicating a number of frequency domain (FD) bases and a second parameter indicating a maximum number of non-zero coefficients (NZC); as well as A channel state information (CSI) report is sent based on the received information.

29. The method of claim 28, wherein the first parameter is based on the number of TRPs in the set of TRPs.

30. A method according to claim 28, wherein the CSI report includes CSI part 1 and CSI part 2, wherein the CSI part 1 includes a rank indicator (RI), a channel quality indicator (CQI), a total number of NZCs, and a TRP selection indicating a selected TRP in the set of TRPs, and wherein the CSI part 2 includes at least a per-TRP SD basis selection for the selected TRP in the set of TRPs.

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