Techniques for facilitating utilization of indication redundancy between transmit-receive point selection and spatial domain base selection

Abstract

Apparatuses, methods, and computer-readable media are disclosed herein for facilitating utilization of indication redundancy between transmit-receive point selection and spatial domain base selection. An example method for wireless communication at a user equipment includes receiving a configuration to configure a channel state information (CSI) report associated with coherent joint transmission (CJT) having a plurality of transmit receive points (TRPs). The example method also includes receiving a CSI reference signal (CSI-RS). The example method also includes transmitting the CSI report based on measurements performed on the CSI-RS, the CSI report based on the configuration, the CSI report indicating a beam selection of one or more selected beams of the plurality of TRPs, the beam selection indicating a total number of selected beams, the total number of selected beams indicating a total number of selected beams. And the total number of selected beams spans all TRPs of the plurality of TRPs and is independent of the selected TRP indicated in the CSI report.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit and priority of PCT application serial number PCT / CN2022 / 099353, entitled “TECHNIQUES TO FACILITATE EXPLOITING INDICATIONREDUNDANCY BETWEEN TRANSMISSION RECEPTION POINT SELECTION AND SPATIAL DOMAINBASIS SELECTION” and filed on June 17, 2022, the entire contents of which are expressly incorporated herein by reference. Technical Field

[0003] The present disclosure relates generally to communication systems, and more particularly to wireless communications utilizing coherent joint transmission (CJT) from multiple transmit receive points (TRPs). Background Art

[0004] 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.

[0005] 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 of a telecommunication standard is 5G New Radio (NR). 5G NR is part of the continued 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. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Certain aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. Further improvements to 5G NR technology are needed. In addition, these improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the invention

[0006] The following presents a summary of one or more aspects in order to provide a basic understanding of these aspects. This summary is not an extensive review of all envisioned aspects. This summary is neither intended to identify the key or important elements of all aspects, nor to describe the scope of any or all aspects. Its only 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.

[0007] In one aspect of the present disclosure, methods, computer-readable media, and devices for wireless communications are provided. An apparatus may include a user equipment (UE). The example apparatus may receive a configuration for configuring a channel state information (CSI) report associated with a coherent joint transmission (CJT) having multiple transmit receive points (TRPs). The example apparatus receives a CSI-RS. Additionally, the example apparatus may send the CSI report based on measurements performed on the CSI-RS, the CSI report being based on the configuration, the CSI report indicating a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the multiple TRPs and being independent of the selected TRP indicated in the CSI report.

[0008] In another aspect of the present disclosure, methods, computer-readable media, and devices for wireless communications are provided. An apparatus may include a network entity, such as a base station. The example apparatus may send a configuration to configure a CSI report associated with multiple TRPs. The example apparatus may also send a CSI-RS. Additionally, the example apparatus may receive the CSI report based on the configuration and the CSI-RS, the CSI report indicating a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the multiple TRPs and independent of the selected TRP indicated in the CSI report. The example apparatus may also send data in a CJT based at least in part on the CSI report.

[0009] To achieve the aforementioned and related purposes, one or more aspects may include the features fully described below and specifically 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 are only indicative of only some of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

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

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

[0013] Figure 2C is a diagram illustrating an example of a second frame according to various aspects of the present disclosure.

[0014] Figure 2D is a diagram illustrating an example of uplink (UL) channels within a subframe according to various aspects of the present disclosure.

[0015] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0016] Figure 4A is a diagram illustrating characteristics of non-coherent joint transmission (NCJT) according to various aspects of the present disclosure.

[0017] Figure 4B is a diagram illustrating characteristics of a CJT according to various aspects of the present disclosure.

[0018] Figure 5 is a diagram illustrating components of a pre-decoder in some aspects of wireless communications in accordance with various aspects of the present disclosure.

[0019] Figure 6 is a diagram illustrating a set of pre-decoder components used in some aspects of CJT according to various aspects of the present disclosure.

[0020] Figure 7 is a diagram illustrating an example of two-part CSI according to various aspects of the present disclosure.

[0021] Figure 8 is a diagram illustrating an example of K transmission hypotheses associated with CSI reporting according to various aspects of the present disclosure.

[0022] Fig. 9 is an example communication flow between a network entity and a UE according to the teachings disclosed herein.

[0023] Fig.10 is a diagram illustrating an example of a first CSI portion and a second CSI portion that may be included in a CSI report according to the teachings disclosed herein.

[0024] Fig.11 is a diagram illustrating another example of a first CSI portion and a second CSI portion that may be included in a CSI report according to the teachings disclosed herein.

[0025] Fig.12is a diagram illustrating another example of a first CSI portion and a second CSI portion that may be included in a CSI report according to the teachings disclosed herein.

[0026] Fig.13 is a diagram illustrating another example of a first CSI portion and a second CSI portion that may be included in a CSI report according to the teachings disclosed herein.

[0027] Fig.14 is a diagram of a table illustrating different CSI overheads based on different CSI reports according to the teachings disclosed herein.

[0028] Fig.15 is a flow chart of a method of wireless communication at a UE according to the teachings disclosed herein.

[0029] Fig.16 are diagrams illustrating examples of hardware implementations for example apparatuses and / or network entities.

[0030] Fig.17 is a flow chart of a method of wireless communication at a network entity according to the teachings disclosed herein.

[0031] Fig.18 is a diagram illustrating an example of a hardware implementation for an example network entity. DETAILED DESCRIPTION

[0032] In some aspects of wireless communication, joint transmission across multiple TRPs may be implemented. The joint transmission may be non-coherent JT (NCJT) where data (layers) may be pre-coded separately on different TRPs, or may be CJT where the same layer may be transmitted via multiple TRPs with phase coherence.

[0033] 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, for example, in a low frequency band such as FR1 based on a Type II codebook. In some aspects, providing additional TRPs for CJT may effectively increase the size of the antenna used to transmit the low frequency transmissions.

[0034] In some examples where multiple TRPs are supported, the indication of TRP selection and the indication of spatial domain (SD) basis selection may be coupled. For example, a beam may be indicated based on the antenna port of the TRP. Thus, by indicating a particular beam, the corresponding TRP may also be indicated, since the TRP may be an intermediate dimension or level for indicating a particular beam.

[0035] Various aspects disclosed herein provide techniques for exploiting the relationship between TRP selection and SD base selection to improve communication performance, for example, by reducing the overhead associated with indicating the TRP selection and the SD base selection. In some examples, the number of selected SD bases (e.g., L beams) may be configured to the UE and may represent the total number of selected SD bases across all TRPs and may be independent of the N TRPs indicated in the CSI report.

[0036] Certain aspects of the subject matter described in this disclosure may be implemented to achieve one or more of the following potential advantages. In some examples, by indicating TRP selection and SD basis selection via CSI part 1 and CSI part 2, the described techniques may be used to reduce the overhead associated with indicating TRP selection and SD basis selection for CJT.

[0037] Although the following description provides examples involving 5G NR, the concepts described herein may be applicable to other similar areas that utilize CJTs from multiple TRPs, such as 6G, 5G-advanced, LTE, LTE-A, CDMA, GSM, and / or other wireless technologies.

[0038] The detailed description set forth below in conjunction with the accompanying drawings is a description of various configurations and does not represent the only configurations with 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 instances, well-known structures and components are shown in block diagram form to avoid blurring these concepts.

[0039] Several aspects of the telecommunication system are also presented with reference to various apparatuses and methods. These apparatuses 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 can 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.

[0040] For example, an element or any part of an element or any combination of elements can 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 chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gate logic components, discrete hardware circuits, and other suitable hardware configured to perform various functions described throughout the present disclosure. One or more processors in a processing system can 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, processes, functions, or any combination thereof.

[0041] Therefore, in one or more example aspects, specific implementations and / or use cases, the described functions may be implemented with hardware, software, or any combination thereof. If implemented with software, the functions 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 medium that can be accessed by a computer. By way of 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 may be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

[0042] 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 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, 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 equipment, vehicles, communication equipment, computing equipment, industrial equipment, retail / purchase equipment, medical equipment, artificial intelligence (AI) enabled devices, etc.). Although some examples may be specifically for use cases or applications, or may not be specifically for use cases or applications, the described examples may have a wide range of applicability. 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 practical environments, the equipment in conjunction with the various aspects and features described may also include additional components and features for implementing and practicing the various aspects claimed and described. 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 / accumulators, etc.) The 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.

[0043] 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 a 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 architecture or a 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.

[0044] 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).

[0045] Base station operation or network design may take into account the aggregated nature of base station functions. For example, a disaggregated base station may be used in an integrated access and 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.

[0046] 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) that 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 (e.g., 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.

[0047] Units (i.e., CUs (e.g., CU 110), DUs (e.g., DU 130), RUs (e.g., RU 140), and near-RT RICs (e.g., near-RT RIC 125), non-RT RICs (e.g., non-RT RIC 115) and each of the SMO framework 105 may include or be coupled to one or more interfaces configured to receive or send signals, data, or information (collectively referred to as signals) via a wired or wireless transmission medium. Each of these 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 a transmission medium. For example, these units may include a wired interface configured to receive or send signals to one or more of the other units on a 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 or send signals, or both, to one or more of the other units on a wireless transmission medium.

[0048] 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 configured to communicate signals with other control functions hosted by CU 110. CU 110 may be configured to handle user plane functions (i.e., central unit-user plane (CU-UP)), control plane functions (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.

[0049] DU 130 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RUs. In some aspects, DU 130 may be responsible for 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.) depending at least in part on a functional split (such as a functional split defined by 3GPP). In some aspects, DU 130 may further 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.

[0050] Lower layer functions 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 over-the-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).

[0051] 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 instantiating 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 .

[0052] 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.

[0053] 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 adjust 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).

[0054] 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 transmission 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. The 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 to DL compared to UL). The 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).

[0055] Certain UEs may communicate with each other using device-to-device (D2D) communications (e.g., D2D communication links 158). D2D communication links 158 may use DL / UL wireless wide area network (WWAN) spectrum. D2D communication links 158 may use one or more side link channels, such as a physical side link broadcast channel (PSBCH), a physical side link discovery channel (PSDCH), a physical side link shared channel (PSSCH), and a physical side link control channel (PSCCH). D2D communications may be performed via a variety of wireless D2D communication systems, such as, for example, Bluetooth, Wi-Fi, LTE, or NR based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard.

[0056] 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.

[0057] 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 to 7.125 GHz) and FR2 (24.25 GHz to 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).

[0058] The 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 (7.125GHz-24.25GHz). The frequency bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, and therefore the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. In addition, currently higher frequency bands are being explored to extend 5G NR operation to more than 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR2-2 (52.6GHz-71GHz), FR4 (71GHz-114.25GHz) and FR5 (114.25GHz-300GHz). Each of these higher frequency bands falls within the EHF band.

[0059] In view of the above, unless otherwise specified, 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 specified, 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.

[0060] 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 the best transmit direction for each of the base station 102 / UE 104. The transmit direction and the receive direction of the base station 102 may be the same, or may be different. The transmit direction and the receive direction of the UE 104 may be the same, or may be different.

[0061] The base station 102 may include and / or be referred to as a gNB, a Node B, an eNB, an access point, a transceiver base station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a 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 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 decomposed base station including one or more of a CU, a DU, and / or a RU. A set of base stations that may include decomposed base stations and / or aggregated base stations may be referred to as a next generation (NG) RAN (NG-RAN).

[0062] 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. The AMF 161 is a control node that handles signaling between the UE 104 and the core network 120. The AMF 161 supports registration management, connection management, mobility management, and other functions. The SMF 162 supports session management and other functions. The UPF 163 supports packet routing, packet forwarding, and other functions. The UDM 164 supports the generation of authentication and key agreement (AKA) credentials, user identity processing, access authorization, and subscription management. The 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 positioning 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 measurement results and assistance information from the NG-RAN and the UE 104 via the AMF 161 to calculate the positioning of the UE 104. The NG-RAN may determine the positioning of the UE 104 using one or more positioning methods. Positioning the UE 104 may involve signal measurements, positioning estimates, and optional speed calculations based on these measurements. Signal measurements may be performed by the UE 104 and / or the base station 102 serving the UE 104. 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 / location 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.

[0063] 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 terms. 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.

[0064] Reference again Figure 1 In certain aspects, a device communicating with a network entity, such as a UE 104 communicating with a base station 102 or a component of a base station (e.g., CU 110, DU 130, and / or RU 140), may be configured to manage one or more aspects of wireless communications. For example, the UE 104 may have a CJT CSI reporting component 198 that may be configured to facilitate utilizing indication redundancy between TRP selection and SD base selection.

[0065] In certain aspects, the CJT CSI reporting component 198 may be configured to receive a configuration configuring a CSI report associated with a CJT having multiple TRPs. The example CJT CSI reporting component 198 may also be configured to receive a CSI-RS. Additionally, the example CJT CSI reporting component 198 may be configured to send a CSI report based on measurements performed on the CSI-RS, the CSI report based on the configuration indicating beam selection for one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the multiple TRPs and independent of the selected TRP indicated in the CSI report.

[0066] In another configuration, a network entity such as the base station 102 or a component of the base station (e.g., the CU 110, the DU 130, and / or the RU 140) may be configured to manage one or more aspects of wireless communication. For example, the base station 102 may have a CJT CSI-RS component 199 that may be configured to facilitate utilizing indication redundancy between TRP selection and SD base selection.

[0067] In certain aspects, the CJT CSI-RS component 199 may be configured to send a configuration configuring a CSI report associated with multiple TRPs. The example CJT CSI-RS component 199 may also be configured to send the CSI-RS. Additionally, the example CJT CSI-RS component 199 may be configured to receive a CSI report based on the configuration and the CSI-RS, the CSI report indicating a beam selection for one or more selected beams for the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the multiple TRPs and independent of the selected TRP indicated in the CSI report. The example CJT CSI-RS component 199 may also be configured to send data in the CJT based at least in part on the CSI report.

[0068] Figure 2A FIG200 is a diagram illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. Figure 2C FIG250 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) (wherein, for a particular set of subcarriers (carrier system bandwidth), subframes within the subcarrier set are dedicated to either DL or UL), or may be time division duplex (TDD) (wherein, for a particular set of subcarriers (carrier system bandwidth), subframes within the subcarrier set are dedicated to both DL and UL). Figure 2A , Figure 2CIn 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 both DL and both UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. The slot format is configured for the UE via a received slot format indicator (SFI) (dynamically configured via DL control information (DCI) or semi-statically / statically configured via radio resource control (RRC) signaling). Note that the following description also applies to the 5G NR frame structure as TDD.

[0069] FIG. 2A to FIG. 2D The 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 subframes of the same size (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 conventional or extended. For a conventional 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 the parameter set. The parameter set defines the subcarrier spacing (SCS) (see Table 1). Symbol length / duration can be scaled with 1 / SCS.

[0070]

[0071] Table 1: Parameter set, SCS and CP

[0072] 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. Accordingly, for normal CP and parameter set μ, there are 14 symbols / slot and 2 μtime slots / subframe. As shown in Table 1, the subcarrier spacing may be equal to 2μ*15kHz, where μ is a parameter set 0 to 4. Thus, 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 inversely related to 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).

[0073] A resource grid may be used to represent a 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 plurality of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0074] like Figure 2A As illustrated in FIG, 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).

[0075] Figure 2BExamples 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 specific 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 specific 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 called SS block (SSB)). The MIB provides the number of RBs in the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information such as system information blocks (SIBs) that are not sent via the PBCH, and paging messages.

[0076] like Figure 2C As 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 combs in the comb. The SRS may be used by the base station for channel quality estimation to achieve frequency-dependent scheduling of the UL.

[0077] Figure 2DExamples 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 buffer status reports (BSRs), power headroom reports (PHRs), and / or UCI.

[0078] 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 of , 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 an access network. Figure 3 As shown in , 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.

[0079] 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 functions. 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 functions 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 functions associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with delivery 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 functions 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.

[0080] The TX processor 316 and the RX processor 370 implement layer 1 functions associated with various signal processing functions. Layer 1 (which includes the physical (PHY) layer) may include error detection on the transmission channel, forward error correction (FEC) decoding of the transmission channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 processes 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 decoded and modulated symbols can then be split into parallel streams. Each stream can then be mapped to an OFDM subcarrier, each stream can be multiplexed with a reference signal (e.g., a pilot) in the time domain and / or frequency domain, and each stream can then be combined using an inverse fast Fourier transform (IFFT) to generate 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 based on reference signals and / or channel condition feedback sent by UE 350. Each spatial stream may then be provided to a different antenna in antenna 320 via a separate transmitter (e.g., transmitter 318Tx). Each transmitter 318Tx may modulate a radio frequency (RF) carrier using a corresponding spatial stream for transmission.

[0081] At UE 350, each receiver 354Rx receives a signal through its corresponding antenna in antenna 352. Each receiver 354Rx recovers the information modulated onto the RF carrier and provides the information to RX processor 356. TX processor 368 and RX processor 356 implement layer 1 functions associated with various signal processing functions. RX processor 356 can perform spatial processing on information to recover any spatial stream destined for UE 350. In the case where multiple spatial streams are destined for UE 350, two or more of the multiple spatial streams can be combined into a single OFDM symbol stream by RX processor 356. Then RX processor 356 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 symbol and reference signal on each subcarrier are recovered and demodulated by determining the signal constellation point most likely to be sent by base station 310. These soft decisions can be based on channel estimates calculated by 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 functions.

[0082] 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.

[0083] Similar to the functions described in conjunction with DL transmission performed by the base station 310, the controller / processor 359 provides RRC layer functions associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functions associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functions 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 functions 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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 CJT CSI Report Component 198 combines various aspects.

[0088] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to perform operations related to Figure 1 The CJT CSI-RS component 199 combines various aspects.

[0089] In some aspects of wireless communication, joint transmission across multiple TRPs may be implemented. The joint transmission may be non-coherent JT (NCJT) where data (layers) may be pre-coded separately on different TRPs, or may be CJT where the same layer may be transmitted via multiple TRPs with phase coherence.

[0090] Figure 4A 400 is a diagram illustrating the characteristics of NCJT as presented herein. Graph 400 illustrates that for NCJT, A ”) may be associated with a first set of layers (eg, a set of layers) associated with a first set of TRP ports (eg, ports of TRP A 404), and associated with a second set of data 412 (“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 B 414). For NCJT, the first data 402 and the second data 412 may be pre-decoded using a pre-decoder matrix 430.

[0091] Data may be pre-coded separately at different TRPs. For example, the first column of the pre-coder matrix 430 indicates that at a first instance, the first TRP will transmit data, and the value "0" indicates that the second TRP will not transmit data. Then, the second column of the pre-coder matrix 430 indicates that at a second instance, the first TRP will not transmit (e.g., based on the value "0") and the second TRP will transmit. Data is represented by X A (eg, first data 402) and X B (eg, second data 412) indicates that based on V A 432 pre-decodes the first data 402 and based on V B 434 pre-decodes the second data 412 for transmission via TRPA 404 and TRP B 414, respectively.

[0092] exist Figure 4A In the illustrated example of The dimensions of is a value based on the number of transmit antennas of TRP, and RI TRP Corresponds to the rank indicator for the TRP, for example, the number of layers for the TRP. Figure 4A In FIG. 4 , TRP A 404 includes four antenna ports and 1 layer, for example, corresponding to V A :4×1, while TRP B 414 includes four antenna ports and two layers, for example, corresponding to V B :4×2. The data can be based on the RI×1 of the corresponding TRP, for example, RI TRP ×1, so that the data for TRP A 404 is X A : 1×1 and the data for TRP B 414 is X B :1×1 and 2. exist Figure 4A In the example of , diagram 400 includes a mapping 440 for data sent on the TRP.

[0093] Figure 4B 4 is a diagram 450 illustrating the characteristics of CJT as presented herein. Diagram 450 illustrates that, in contrast to NCJT, for CJT, a first set of layers (e.g., a set of 2 layers) associated with joint data 452 ("X") may be jointly pre-decoded to be sent from both TRP A and TRP B via TRP A port 454 and TRP B port 456 in a coherent manner. For example, a first pre-decoder component 460A ("V A ”) and the second pre-decoder component 460B (“V B ”) pre-decodes the joint data 452.

[0094] Figure 4B The example pre-decoder matrix 460 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 4B In the example of FIG. 1 , each of TRP A and TRP B has four antenna ports and a maximum of 2 layers, such that V A :4×2 and V B :4×2. Data can be based on For example, So that the data is X: 2×1. Figure 4B In the example, diagram 450 includes a joint mapping 470 for data sent on the TRP.

[0095] 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, for example, in a low frequency band such as FR1 based on a Type II codebook. In some aspects, providing additional TRPs for CJT may effectively increase the size of the antenna used to transmit the low frequency transmissions.

[0096] Figure 5 5 is a diagram 500 illustrating components of a pre-decoder in some aspects of wireless communication. Figure 5 In the example of FIG. 5 , diagram 500 illustrates that for each layer, for example, a first layer 510 (“layer 0”), a second layer 520 (“layer 1”), a third layer 530 (“layer 2”), and a fourth layer 540 (“layer 3”), a first matrix W may be used to represent the first layer 510 (“layer 0”), a second layer 520 (“layer 1”), a third layer 530 (“layer 2”), and a fourth layer 540 (“layer 3”). 1 , the second matrix W f or W f H and the third matrix To generate the pre-decoder W. The first matrix w 1 Can be associated with the spatial domain (SD), the second matrix w f or W f H can be associated with the frequency domain (FD), and the third matrix May be associated with a non-zero coefficient (NZC) set.

[0097] In some aspects, the first matrix W 1 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 W may be RRC configurable. In some aspects, the first matrix W may be selected from a set of SD basis matrices (eg, DFT basis) for the spatial domain. 1 The first matrix may be common to layers to be transmitted via joint transmission (eg, NCJT or CJT). As used herein, the term “SD basis” may also be referred to as a “beam”.

[0098] In some aspects, the second matrix W f or W f H Can be M×N 3 matrix, where M may be the number of RRC configurations of the FD basis (eg, FD DFT basis), and N 3is the number of spatial domain bases. In some examples, M can be rank-pair specific. For example, for rank = {1, 2}, M 1 =M 2 , and for rank = {3, 4}, M 3 =M 4 In some aspects, the second matrix W f or W f H can be layer-specific, so that the second matrix W f or W f H may include a first selected FD basis set associated with a first layer, wherein the first selected FD basis set may or may not be associated with a second matrix W associated with a second layer. f or W f H The selected FD basis sets overlap completely or partially.

[0099] In some aspects, the third matrix It can be a 2L×M matrix including the NZC set. In some aspects, the third matrix is layer specific, and CSI can report up to K for each layer 0 NZCs and report up to 2K across all layers 0 NZCs, where unreported coefficients are assumed to be or are set to zero. These coefficients may be quantized based on pre-configured quantization values ​​and / or may be RRC configured quantization values.

[0100] Figure 6 is an example of a set of pre-decoder components (eg, SD components W) used in some aspects of CJT as presented herein. 1 、FD component W f or W f H And components ) is a diagram 600 of FIG. 1 . In a first scenario 610, the TRP may be a co-located TRP / panel and may be referred to as an "intra-site" TRP. In a second scenario 630, the TRP may be a distributed TRP and may be referred to as an "inter-site" TRP.

[0101] In examples where the TRPs are intra-site TRPs (e.g., first scenario 610), the TRPs may have the same spatial orientation (e.g., first intra-site scenario 612) or different spatial orientations (e.g., second intra-site scenario 620). For example, in the first intra-site scenario 612 (e.g., scenario 1A) associated with CJTs from multiple co-located TRPs (e.g., antennas at the same site) having the same spatial orientation, the same spatial domain matrix W 1may be associated with (or used for) each TRP (e.g., for TRP A 614 and for TRP B 616). In a second intra-site scenario 620 (e.g., scenario 1B) associated with CJTs for co-located TRPs (e.g., antennas at the same site) having different spatial orientations, a different spatial domain matrix W 1,A and W 1,B may be associated with (or used for) different TRPs (e.g., for TRP A 622 is the spatial domain matrix W 1,A , and for TRP B624 is the spatial domain matrix W 1,B ).

[0102] In the example where the TRP is an inter-station TRP (eg, the second scenario 630), each component (eg, SD component W) may be selected independently. 1 、FD component W f or W f H And components ). For example, different spatial domain matrices W 1,A and W 1,B may be associated with (or used for) different TRPs at different sites (e.g., for TRP A 632 is the spatial domain matrix W 1,A , and for TRP B 634 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 (e.g., for TRP A 632 is the spatial domain matrix W f,A H , and for TRP B 634 is the spatial domain matrix W f,B H Finally, each of TRP A 632 and TRP B 634 may further be connected to a different third component. and In some aspects, a TRP may be further associated with an additional in-phase / same-amplitude coefficient q.

[0103] 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 relatively 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 the CSI report to determine the payload size of CSI Part 2.

[0104] Figure 7 is a diagram 700 illustrating an example of a two-part CSI as presented herein. Figure 7 In the illustrated example of , diagram 700 illustrates a first CSI portion 710 (eg, CSI portion 1) and a second CSI portion 730 (eg, CSI portion 2). Figure 7 In the example of the first CSI part 710, the first CSI part 710 includes an RI field 712, a CQI field 714, and an NZC number field 716. The RI field 712 may indicate the number of layers associated with the corresponding transmission. The CQI field 714 may indicate CQI information associated with the corresponding transmission. The NZC number field 716 may indicate NZC information associated with the corresponding transmission. In some examples, both the RI field 712 and the NZC number field 716 may be used to determine the payload size of the second CSI part 730.

[0105] exist Figure 7 In the example of FIG. 7 , the second CSI part 730 includes an SD basis selection field 732 and an FD basis selection field 734. The SD basis selection field 732 may indicate the SD component W for the pre-decoder W. 1 N 1 N 2 O 1 O 2 The FD basis selection field 734 may indicate the FD component W for the precoder W. f or W f H N 3The selection of the M FD bases may be for each layer. For example, the RI field 712 of the first CSI part 710 may indicate that there are RI layers, and therefore, the FD basis selection field 734 may indicate M FD bases for layer 0 to layer RI-1.

[0106] In some examples, the second CSI portion 730 may include an indication of parameters associated with the NZC indicated in the NZC quantity field 716 of the first CSI portion 710. For example, the second CSI portion 730 may include a strongest coefficient indication field 736 for each of layers 0 to RI-1, a coefficient selection indication field 738 for each of layers 0 to RI-1, and an NZC quantization indication field 740 for each of layers 0 to RI-1. The strongest coefficient indication field 736 may indicate the strongest coefficient in the third matrix of the pre-decoder W. The coefficient selection indication field 738 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 740 may indicate the amplitude and / or phase quantization of the NZC in each layer (eg, based on the strongest coefficient indication indicated by the strongest coefficient indication field 736 for the corresponding layer).

[0107] It is understood that in other examples, the order of the fields of the first CSI part 710 and / or the second CSI part 730 may be different. Additionally or alternatively, in other examples, the first CSI part 710 and / or the second CSI part 730 may include additional or alternative fields.

[0108] 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.

[0109] In some aspects of wireless communication, the 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) a first matrix W for SD basis selection indication (e.g., via SD basis selection field 732); 1 different sizes, (2) a second matrix W for FD basis selection indication (eg, via indication of FD basis selection field 734) f and / or (3) for a third matrix Different sizes of the associated strongest coefficient indication field 736 , coefficient selection indication field 738 and / or NZC quantization indication field 740 .

[0110] 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.

[0111] Figure 8 An example table 800 including different transmission assumptions associated with corresponding numbers of TRPs as presented herein is illustrated. Figure 8 In the example of FIG. 800 , CJT communication can be based on up to four TRPs (eg, TRP A, TRP B, TRP C, and TRP D). As shown in table 800 , different combinations of TRPs can be used for CJT based on the number of TRPs selected. Figure 8 Table 800 in illustrates an example where fifteen transmission hypotheses may exist based on up to four TRPs. For example, Table 800 indicates that when one TRP is selected (e.g., the number of TRPs is 1), there are four transmission hypotheses. For example, CJT may use TRP A, TRP B, TRP C, or TRP D. In an example where two TRPs are selected (e.g., the number of TRPs is 2), there are six possible TRP combinations. For example, a first TRP combination includes TRP A and TRP B, a second TRP combination includes TRP A and TRP C, a third TRP combination includes TRP A and TRP D, a fourth TRP combination includes TRP B and TRP C, a fifth TRP combination includes TRP B and TRP D, and a sixth TRP combination includes TRP C and TRP D. Each TRP combination in the TRP combination corresponds to a transmission hypothesis, as indicated by the six different transmission hypotheses included in Table 800 and corresponding to the two selected TRPs. In a similar manner, when three of the four TRPs are selected (e.g., the number of TRPs is 3), there are four TRP combinations corresponding to the four example transmission hypotheses of Table 800, and when all four TRPs are selected (e.g., the number of TRPs is 4), there is one TRP combination corresponding to one example transmission hypothesis of Table 800. Figure 8 In the example of , when up to four TRPs can be selected, there are a total of fifteen transmission hypotheses.

[0112] In some examples, the N TRPs may be configured by the network (e.g., a network entity such as a base station or a component of a base station). For example, the N selected TRPs may be configured by the network via higher layer signaling (such as RRC signaling). In some such examples, the UE may report one transmission hypothesis in the CSI report because the TRP selection is known to the network.

[0113] In some examples, N TRPs are selected by the UE and reported as part of the CSI report. In some such examples, the N TRPs reported by the UE are between 1 and N TRP where N is the number of selected TRPs, and N TRP is the maximum number of collaborative TRPs. TRP The value of can be configured by the network. In the example where the UE selects N TRPs, the UE may also report which of the TRPs were selected.

[0114] In some examples, the UE may report CSI corresponding to K transmission hypotheses. In some such examples, the K transmission hypotheses may be based on N TRPs, and the N TRPs may be configured by the network (e.g., via higher layer signaling, such as RRC signaling). Figure 8 In the example of , although Table 800 indicates that there are six transmission hypotheses when two TRPs are selected, the network may configure a subset of the six transmission hypotheses when two TRPs are selected.

[0115] In some examples, in addition to TRP selection, the UE may also select one or more SD bases (e.g., one or more beams) to include in the CSI report. 1 Multiply by N 2 The TRP of the antenna element can exist in total N 1 N 2 O 1 O 2 Total beams, where O 1 YesN 1 Oversampling in the direction, and O 2 YesN 2 Oversampling in the direction. UE can 1 N 2 O 1 O 2 The UE can also use two fields of the CSI report (e.g., Figure 7 The first subfield may indicate an oversampled beam group, and the second subfield may indicate the selected L beams (SD basis) within the beam group. In some examples, the first subfield may be associated with the log 2 O 1O 2 The second subfield may be associated with a bit width (or size) of bits. bits, where Denote the total combination, and apply an upper limit function so that the minimum number of bits can be used to indicate L beams.

[0116] In some examples where multiple TRPs are supported, the indication of TRP selection and the indication of SD base selection may be coupled. For example, a beam may be indicated based on the antenna port of the TRP. Thus, by indicating a specific beam, the corresponding TRP may also be indicated, since the TRP may be an intermediate dimension or level for indicating a specific beam.

[0117] Various aspects disclosed herein provide techniques for exploiting the relationship between TRP selection and SD base selection to improve communication performance, for example, by reducing the overhead associated with indicating TRP selection and SD base selection. In some examples, the number of selected SD bases (e.g., L beams) may be configured to the UE and may represent the total number of selected SD bases across all TRPs. The number of selected SD bases may also be independent of the N TRPs indicated in the CSI report. For example, for selected N TRPs, the total number of L beams may be defined by Equation 1 (below).

[0118] Equation 1:

[0119] In Equation 1, the term n refers to the specific TRP, and the term L n refers to the number of beams selected for the nth TRP, and therefore, the term L refers to the total number of beams selected across N TRPs.

[0120] Fig. 9 An example communication flow 900 between a network entity 902 and a UE 904 as presented herein is illustrated. One or more aspects described with respect to the network entity 902 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 902 may be performed by Figure 1 Base station 102 and / or Figure 3 Various aspects of UE 904 may be implemented by Figure 1 UE 104 and / or Figure 3 UE 350. Fig. 9 Not shown in the illustrated example, but in additional or alternative examples, the network entity 902 may communicate with one or more other base stations or UEs, and / or the UE 904 may communicate with one or more other base stations or UEs.

[0121] exist Fig. 9In the example of , the network entity 902 and the UE 904 may each include or be associated with multiple TRPs and have CJT capabilities. In the illustrated example, the communication flow 900 facilitates the UE 904 to utilize the indication redundancy between TRP selection and SD base selection in the two-part CSI.

[0122] like Fig. 9 As shown, the network entity 902 may output a CJT-CSI configuration 910 that is received by the UE 904. The CJT-CSI configuration 910 may configure the UE 904 to use one or more parameters when sending a CSI report. Fig.10 , Fig.11 and Fig.12 To describe various aspects of one or more parameters associated with CSI reporting.

[0123] The network entity 902 may send a CSI-RS 920 that is received by the UE 904. At 930, the UE 904 may perform measurements on the CSI-RS 920. At 940, the UE 904 may determine a set of parameters for a CSI report 950. The set of parameters for the CSI report 950 may be based on the CJT CSI configuration 910, and the values ​​of the set of parameters may be based on the measurements of the CSI-RS 920.

[0124] like Fig. 9 As shown, UE 904 may send a CSI report 950 that is received by network entity 902. CSI report 950 may be populated with values ​​determined by UE 904 (e.g., at 940). Fig. 9 In the example of , CSI report 950 includes a first CSI portion 952 and a second CSI portion 954. The first CSI portion 952 may have a fixed payload size, and the second CSI portion 954 may have a variable payload size indicated by the first CSI portion 952. Fig.10 , Fig.11 and / or Fig.12 As described, at least one of the first CSI portion 952 or the second CSI portion 954 may indicate one or more TRP and SD bases for CJT of data (eg, CJT data 970).

[0125] At 960, the network entity 902 may decode the first CSI portion 952 of the CSI report 950. At 962, the network entity 902 may decode the second CSI portion 954 of the CSI report 950. The network entity 902 may use aspects of the first CSI portion 952 to determine a payload size for the second CSI portion 954. Based on the first CSI portion 952 and / or the second CSI portion 954, the network entity 902 may send CJT data 970 that is received by the UE 904.

[0126] Fig.10 1 is a diagram illustrating an example CSI report 1000 including a first CSI portion 1010 and a second CSI portion 1030 as presented herein. Fig.10 Although not shown in the example of FIG. 1 , the second CSI portion 1030 may include one or more additional or alternative fields, such as Figure 7 The configuration of the CSI report 1000 can be performed via a CJT CSI configuration (such as Fig. 9 CJT CSI configuration 910) to configure. Fig.10 In the example, the CSI report 1000 includes one or more parameters (or fields) that facilitate indicating TRP selection and SD base selection.

[0127] exist Fig.10 In the illustrated example, the first CSI portion 1010 may be similar to Figure 7 The first CSI part 710. For example, Fig.10 The first CSI part 1010 includes an RI field 1012 , a CQI field 1014 , and an NZC quantity field 1016 .

[0128] like Fig.10 As shown, the second CSI part 1030 may include an SD basis selection field 1032. For the maximum number of CSI measurements configured (N TTP ) of TRPs (each of these TRPs is configured with N 1 N 2 O 1 O 2 The SD basis selection field 1032 may include a first parameter 1034 and a second parameter 1036. The first parameter 1034 may indicate the oversampled beam group for each TRP, respectively. The size (eg, bit width) of the first parameter 1034 may be based on the maximum number of TRPs (N) that can be used for CJT. TRP ) and the number of oversampled beam groups ( 1 O 2 ). For example, the size of the first parameter 1034 may be N TRP log 2 O 1 O 2 bits.

[0129] The second parameter 1036 may indicate N TRP N 1 N 2 The size (eg, bit width) of the second parameter 1036 may be based on the maximum number of TRPs (N) that can be used for CJT.TRP ), the number of beams for each TRP (N 1 N 2 ) and the total number of selected beams (L). For example, the size of the second parameter 1036 can be It is understood that the second parameter 1036 may implicitly indicate which N TRPs (N TTP ), and the selected number of SD bases for each TRP (L n ), n=1...N.

[0130] like Fig.10 As shown in the example, the first parameter 1034 and the second parameter 1036 are included in the second CSI part 1030 of the CSI report 1000.

[0131] exist Fig.10 In the example of FIG. 1 , it can be noted that when the number of selected TRPs is less than the maximum number of TRPs (eg, N <N TRP ), in order to ensure the pre-fixed uplink control information (UCI) payload size, the maximum possible number of TRPs (e.g., N TRP ) to configure the first parameter 1034 and the second parameter 1036. That is, due to Fig.10 The fields of the first CSI part 1010 are Figure 7 The fields of the first CSI part 710 are the same as those of the first CSI part 1010, and in order to enable the first CSI part 1010 to indicate the payload size of the second CSI part 1030, the maximum number of possible TRPs (N TTP ) to fix the size of the first parameter 1034 and the second parameter 1036.

[0132] Fig.11 1 is a diagram illustrating another example CSI report 1100 including a first CSI portion 1110 and a second CSI portion 1030 as presented herein. Fig.11 Although not shown in the example of FIG. 1 , the second CSI portion 1130 may include one or more additional or alternative fields, such as Figure 7 The configuration of the CSI report 1100 can be performed via a CJTCSI configuration (such as Fig. 9 CJT CSI configuration 910) to configure. Similar to Fig.10 Example CSI report 1000, CSI report 1100 includes one or more parameters (or fields) that facilitate indicating TRP selection and SD base selection.

[0133] exist Fig.11In the illustrated example of , the first CSI part 1110 includes an RI field 1112, a CQI field 1114, an NZC number field 1116, and a TRP selection field 1118. The TRP selection field 1118 may be a layer common TRP selection. The TRP selection field 1118 may indicate a set of TRPs associated with different layers transmitted via CJT. The first CSI part 1110 may have a fixed payload size and, therefore, is the same size regardless of the number of TRPs indicated.

[0134] In some examples, TRP selection field 1118 may be implemented as a bitmap-based TRP selection field 1118A. Bitmap-based TRP selection field 1118A may include a bitmap 1140 that includes a number (N) equal to the number of possible TRPs that can be used for CJT. TRP ). For example, for N TRP =4, bitmap 1140 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 value of "0" may indicate that the corresponding TRP is not selected, and a value of "1" may indicate that the corresponding TRP is selected. As an example, the first bit of the bitmap may correspond to TRP A, the second bit of the bitmap may correspond to TRPB, the third bit of the bitmap may correspond to TRP C, and the fourth bit of the bitmap may correspond to TRP D. In this example, the bitmap value {0101} may indicate that TRP B and TRP D are selected for CJT data transmission. Alternatively, the value "0" may indicate that the corresponding TRP is selected, and the value "1" may indicate that the corresponding TRP is not selected. In this example, the bitmap value {0101} will indicate that TRP A and TRP C are selected.

[0135] In some examples, the TRP selection field 1118 may be implemented via a hypothesis-based TRP selection field 1118B. For example, for a configured number of TRPs, a limited number of combinations of TRPs may be possible. In some such examples, a code point may be used to identify a selected set of TRPs. For example, a set of possible TRPs may include a set of two TRPs, as shown in the first code point 1142. In the example of the first code point 1142, the code point has three bits, and the value "000" indicates that TRP A and TRP B are selected for CJT of data, the value "010" indicates that TRP C and TRP D are selected for CJT data, and so on. Each of the different values ​​of the first code point 1142 may correspond to a different combination of TRPs.

[0136] In other examples, the set of possible TRPs may include different combinations of one TRP, two TRPs, three TRPs, and / or four TRPs, such as Figure 8800. For example, the second code point 1144 includes a possible set of two TRPs and a set of four TRPs. The third code point 1146 includes a set of three TRPs. In the example code points based on the assumed TRP selection field 1118B, the number of bits used to identify the selected TRP depends on the total number of possible sets of TRPs. For example, the first code point 1142 illustrates a possible set of four TRPs (where the total number of TRPs may be N). TRP ) of two possible groups of TRPs (where the group size can be configured as n TRR ), three bits are sufficient to identify possible groups of two TRPs. In general, for a fixed group size and number of TRPs, the number of bits used can be given by (For example, greater than or equal to from N TRP The set of n elements TRP The smallest integer given by the base 2 logarithm of the number of combinations of elements.

[0137] In some aspects, the selected TRP may be indicated via a CSI-RS resource indicator (CRI) indicating one or more TRPs. For example, multiple sets of CSI-RS resources indicated by the CRI may be mapped to corresponding multiple sets of selected TRPs, such that the CRI may indicate the selected set of TRPs in addition to the CSI-RS resources.

[0138] In some examples, the TRP selection field 1118 may be implemented via a CRI-based TRP selection field 1118C. For example, different CRI values ​​may map to different selected TRPs. Fig.11 In the example of , a first value of CRI (e.g., "CRI 1") maps to a first selected set of TRPs (e.g., TRP A and TRP B). A second value of CRI (e.g., "CRI 2") maps to a second selected set of TRPs (e.g., TRP A, TRP B, and TRP C), and so on. Each of the different values ​​of CRI may correspond to a different combination of TRPs.

[0139] Similar to Fig.10 An example second CSI portion 1030, Fig.11 The second CSI part 1130 may include an SD basis selection field 1132, which includes a first parameter 1134 and a second parameter 1136. The first parameter 1134 may indicate an oversampled beam group for each selected TRP in the selected TRPs, respectively. TRP )of Fig.10 The first parameter 1034 is opposite, Fig.11The first parameter 1134 may have a size based on the number (N) of selected TRPs. For example, the size of the first parameter 1134 may be Nlog 2 O 1 O 2 bits.

[0140] The second parameter 1136 may indicate NN in a joint manner. 1 N 2 The size (eg, bit width) of the second parameter 1136 may be based on the number of selected TRPs (N), the number of beams for each TRP (N), and the number of 1 N 2 ) and the total number of selected beams (L). For example, the size of the second parameter 1136 can be It is understood that the second parameter 1136 may implicitly indicate which N TRPs (N TPP ), and the selected number of SD bases for each TRP (L n ), n=1...N.

[0141] In some examples, another parameter may be configured to report the UE-determined number of SD bases for each TRP (L n ), n=1...N, thereby satisfying equation 1 (reproduced below).

[0142] Equation 1:

[0143] In some such examples, the second parameter 1136 may be determined solely and based on the total number of beams (N) for a TRP. 1 N 2 ) to select the number of SD bases (L n ) to indicate the selected total beam (L) for all N TRPs. For example, the size of the second parameter 1136 can be determined by Equation 2 (below) or Equation 3 (below).

[0144] Equation 2:

[0145] Equation 3:

[0146] When the second parameter 1136 indicates SD basis selection for each TRP to be encoded separately, Equation 2 may be used. TRP ) when the SD basis for joint coding is selected, Equation 3 can be used.

[0147] like Fig.11As shown in the example of , the TRP selection field 1118 may be included in the first CSI part 1110 of the CSI report 1100, and the first parameter 1134 and the second parameter 1136 may be included in the second CSI part 1130.

[0148] exist Fig.11 In the example of , it may be noted that the TRP selection field 1118 may indicate the size of the second CSI portion 1130. For example, when the TRP selection field 1118 is implemented via a bitmap-based TRP selection field 1118A, the value of the bitmap 1140 may indicate how many TRPs are selected from the maximum number of TRPs. For example, the bitmap value {0101} may indicate that TRP B and TRP D are selected for CJT data transmission, and therefore, two TRPs out of four TRPs are selected. Then, the receiving device (e.g., Fig. 9 The network entity 902 may use the number of selected TRPs (e.g., two TRPs) to determine the payload size of the second CSI portion 1130 by, for example, determining the size of a first parameter 1134 when two TRPs are selected and determining the size of a second parameter 1136 when two TRPs are selected.

[0149] Fig.12 1 is a diagram illustrating another example CSI report 1200 including a first CSI portion 1210 and a second CSI portion 1230 as presented herein. Fig.12 Although not shown in the example of , the second CSI portion 1230 may include one or more additional or alternative fields, such as Figure 7 The configuration of the CSI report 1200 can be performed via a CJTCSI configuration (such as Fig. 9 Similar to example CSI report 1000 and example CSI report 1100, CSI report 1200 includes one or more parameters (or fields) that facilitate indicating TRP selection and SD base selection.

[0150] exist Fig.12 In the illustrated example of FIG. 1 , the first CSI part 1210 includes an RI field 1212, a CQI field 1214, an NZC number field 1216, and a TRP number selection field 1218. The TRP number selection field 1218 indicates the number of selected TRPs (N). The size (e.g., bit width) of the TRP number selection field 1218 may be based on the maximum number of TRPs (N). TRP ). For example, the size of the TRP quantity selection field 1218 may be calculated as (For example, greater than or equal to the maximum number of TRPs (N TRP)). The first CSI part 1210 may have a fixed payload size and, therefore, be the same size regardless of the number of TRPs indicated by the TRP number selection field 1218.

[0151] Similar to Figure 7 An example second CSI portion 730, Fig.12 The second CSI part 1230 may include an SD base selection field 1232. Fig.12 As shown, the SD base selection field 1232 may include a first parameter 1234, a second parameter 1236, and a third parameter 1238. Various aspects of the first parameter 1234 may be similar to Fig.11 The first parameter 1134 may indicate the oversampled beam group for each selected TRP in the selected TRPs, respectively. Fig.12 The first parameter 1234 may have a size based on the number of selected TRPs (N), which may be related to Fig.11 The size of the first parameter 1134 may be the same as the first parameter 1134. For example, the size of the first parameter 1234 may be Nlog 2 O 1 O 2 bits.

[0152] The second parameter 1236 may indicate the selected N TRPs. Aspects of the second parameter 1236 may be similar to Fig.11 The TRP selection field 1118. For example, the second parameter 1236 may be passed similar to Fig.11 The bitmap 1240 may be implemented by the bitmap-based TRP selection 1236A of the bitmap-based TRP selection field 1118A. For example, the bitmap 1240 may indicate the maximum number (N TRP ) is selected by the UE in the CSI report 1200. In such an example, the size of the second parameter 1236 may be determined by Given (e.g., greater than or equal to from N TRP The smallest integer given by the base 2 logarithm of the number of combinations of N elements of a set of N elements.

[0153] In another example, the second parameter 1236 may be provided by a method similar to Fig.11 The code point 1242 may be used to identify a selected set of TRPs. In such examples, for a fixed group size and number of TRPs, the number of bits used may be determined by: (For example, greater than or equal to from N TRP The set of n elementsTRP The smallest integer given by the base 2 logarithm of the number of combinations of elements.

[0154] In another example, the second parameter 1236 may be provided by a method similar to Fig.11 The CRI-based selection 1236C of the CRI-based TRP selection field 1118C may be implemented. For example, multiple sets of CSI-RS resources indicated by the CRI may be mapped to corresponding multiple sets of selected TRPs, so that in addition to the CSI-RS resources, the CRI may also indicate the selected set of TRPs. For example, the CRI 1244 may indicate a maximum number (N TRP ) which TRP is selected by the UE in CSI report 1200.

[0155] The third parameter 1238 may indicate NN in a joint manner. 1 N 2 The selected L beams out of the beams can be similar to Fig.11 The size (eg, bit width) of the third parameter 1238 may be based on the number of selected TRPs (N), the number of beams for each TRP (N 1 N 2 ) and the total number of selected beams (L). For example, the size of the third parameter 1238 can be It is understood that the third parameter 1238 may implicitly indicate which N TRPs (N TRP ), and the selected number of SD bases for each TRP (L n ), n=1...N.

[0156] like Fig.12 As shown in the example, the TRP quantity selection field 1218 may be included in the first CSI part 1210 of the CSI report 1200, and the first parameter 1234, the second parameter 1236 and the third parameter 1238 may be included in the second CSI part 1230.

[0157] exist Fig.12 In the example of , it can be noted that the TRP number selection field 1218 can indicate the size of the second CSI part 1230. For example, the value of the TRP number selection field 1218 can indicate the maximum number (N TRP ) of the TRPs. Then, the receiving device (e.g., Fig. 9The network entity 902) may use the number of selected TRPs to determine the payload size of the second CSI portion 1230, for example by determining the size of a first parameter 1234 when N TRPs are selected, by determining the size of a second parameter 1236 when N TRPs are selected, and by determining the size of a third parameter 1238 when N TRPs are selected.

[0158] Fig.13 1 is a diagram illustrating another example CSI report 1300 including a first CSI portion 1310 and a second CSI portion 1330 as presented herein. Fig.13 Although not shown in the example of , the second CSI portion 1330 may include one or more additional or alternative fields, such as Figure 7 The configuration of the CSI report 1300 can be performed via a CJTCSI configuration (such as Fig. 9 CJT CSI configuration 910) to configure. Similar to Fig.10 Example CSI report 1000, Fig.11 CSI Report 1100 and Fig.12 The CSI report 1200, CSI report 1300 includes one or more parameters (or fields) that facilitate indicating TRP selection and SD base selection.

[0159] exist Fig.13 In the illustrated example of , the first CSI part 1310 includes an RI field 1312, a CQI field 1314, a NZC number field 1316, a TRP selection field 1318, and a selected number of each TRP for SD basis field 1320. The TRP selection field 1318 may be a layer common TRP selection. The TRP selection field 1318 may indicate a set of TRPs associated with different layers transmitted via CJT. The first CSI part 1110 may have a fixed payload size and, therefore, be the same size regardless of the number of TRPs indicated. Aspects of the TRP selection field 1318 may be provided by Fig.11 The TRP selection field 1118 may be implemented as a bitmap-based TRP selection field, a hypothesis-based TRP selection field, or a CRI-based TRP selection field.

[0160] The SD-based selected number per TRP field 1320 may be configured to report the UE-determined number (L) of SD-based per TRP. n ), n=1...N, thereby satisfying equation 1 (reproduced below).

[0161] Equation 1:

[0162] Similar to Fig.10 An example second CSI portion 1030, Fig.13 The second CSI portion 1330 may include an SD base selection field 1332, which includes a first parameter 1334 and a second parameter 1336. The aspects of the first parameter 1334 and the second parameter 1336 may be similar to Fig.11 The first parameter 1134 and the second parameter 1136.

[0163] like Fig.13 As shown in the example, the TRP selection field 1318 and the SD-based selected number per TRP field 1320 may be included in the first CSI part 1310 of the CSI report 1300, and the first parameter 1334 and the second parameter 1336 may be included in the second CSI part 1330.

[0164] For example, the magnitude of the second parameter 1336 may be determined by Equation 2 (below) or Equation 3 (below).

[0165] Equation 2:

[0166] Equation 3:

[0167] When the second parameter 1336 indicates SD basis selection for each TRP to be encoded separately, Equation 2 may be used. TRP ) when the SD basis for joint coding is selected, Equation 3 can be used.

[0168] exist Fig.14 The example table 1400 shows the Fig.10 Example CSI report 1000, Fig.11 An example CSI report 1100 and Fig.12 An example of CSI overhead is shown in Example CSI Report 1200. Fig.14 In the example of FIG. 1 , the values ​​of some parameters are shown. For example, the number of antenna elements in the N1 and N2 directions is four and two respectively, and the oversampling (O) in the N1 and N2 directions is 1 O 2 ) are four and four respectively, the maximum number of TRPs (N TRP ) is four, and the number of selected beams (L) is 6. The number of selected TRPs (N) can be 1, 2, 3 or 4.

[0169] like Fig.14 As shown, based on Fig.10 The size of the first CSI part is unchanged, and the size of the second CSI part is based on the size of the first parameter (16) and the size of the second parameter (20). The size of the first parameter may be based on NTRP log 2 O 1 O 2 =4log 2 4*4=16 bits are used for calculation. The size of the second parameter can be based on bits to calculate. Therefore, based on Fig.10 The overhead of CSI report 1000 added to the CSI for indicating TRP selection and SD base selection is 36 bits and is the same regardless of the number of selected TRPs.

[0170] like Fig.14 As shown, based on Fig.11 For example, based on the bitmap-based TRP selection field 1118A, the size of the first CSI part is 4 bits. The size of the second CSI part is based on the size of the first parameter 1134 and the second parameter 1136. As an example, for two selected TRPs (e.g., N=2), the size of the first parameter may be based on Nlog 2 O 1 O 2 =2log 2 4*4=8 bits are used for calculation. The size of the second parameter can be based on bits to calculate. Therefore, based on Fig.11 The overhead added to the CSI for indicating the TRP selection and SD base selection of the CSI report 1100 is 25 bits (e.g., 4+8+13=25 bits). As another example, for four selected TRPs (e.g., N=4), the size of the first parameter may be based on Nlog 2 O 1 O 2 =4log 2 4*4=16 bits are used for calculation. The size of the second parameter can be based on bits to calculate. Therefore, based on Fig.11 The overhead of the CSI report 1100 added to the CSI used to indicate the TRP selection and the SD base selection is 40 bits (e.g., 4+16+20=40 bits).

[0171] like Fig.14 As shown, based on Fig.12 The size of the first CSI part of the CSI report 1200 is 2 additional bits, which can be based on bits. The size of the second CSI part is based on the sizes of the first parameter 1234, the second parameter 1236, and the third parameter 1238. As an example, for two selected TRPs (eg, N=2), the size of the first parameter may be based on Nlog 2 O1 O 2 =2log 2 4*4=8 bits are used for calculation. The size of the second parameter can be based on bits to calculate. The size of the third parameter can be based on bits to calculate. Therefore, based on Fig.12 The overhead added to the CSI for indicating the TRP selection and SD base selection of the CSI report 1200 is 26 bits (e.g., 2+8+3+13=26 bits). As another example, for four selected TRPs (e.g., N=4), the size of the first parameter may be based on Olog 2 O 1 O 2 =4log 2 4*4=16 bits are used for calculation. The size of the second parameter can be based on bits to calculate. The size of the third parameter can be based on bits to calculate. Therefore, based on Fig.12 The overhead of the CSI report 1200 added to the CSI used to indicate TRP selection and SD base selection is 38 bits (e.g., 2+16+0+20=38 bits).

[0172] like Fig.14 As shown, Fig.10 The CSI report 1000 may not add additional overhead to the first CSI part, but may have a significant increase in additional overhead for the second CSI part, regardless of the number of selected TRPs. Fig.11 The CSI report 1100 may have the lowest overhead for a small number of selected TRPs (eg, N=1 or 2), but has the largest first CSI portion among the three example CSI reports. Fig.12 The CSI report 1200 provides a compromise between the other two CSI reports for the first CSI part and has the same Fig.11 The CSI reports 1100 with almost the same total overhead. Therefore, in some respects, Fig.12 The CSI report 1200 may be a preferred implementation of a CSI report.

[0173] Fig.15 1500 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.16 The method can facilitate reducing the overhead associated with CSI by utilizing the indication redundancy between TRP selection and SD base selection.

[0174] At 1502, the UE receives a configuration for configuring a CSI report associated with a CJT having multiple TRPs, such as in conjunction with Fig. 9 As an example, the receiving of the configuration at 1502 may be performed by, for example, Fig.16 The CJT CSI reporting component 98, the cellular RF transceiver 1622 and / or one or more antennas 1680 of the device 1604 are performed.

[0175] At 1504, the UE receives the CSI-RS, such as in combination with Fig. 9 As an example, the reception of the CSI-RS at 1504 may be performed by, for example, Fig.16 The CJT CSI reporting component 198, cellular RF transceiver 1622 and / or one or more antennas 1680 of the device 1604 are performed.

[0176] At 1506, the UE sends a CSI report based on measurements performed on the CSI-RS, the CSI report being based on a configuration, the CSI report indicating a beam selection for one or more selected beams of the plurality of TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the plurality of TRPs and being independent of the selected TRP indicated in the CSI report, as combined with Fig. 9 The beam selection may be common to each communication layer using one or more selected beams. As an example, the transmission of the CSI report at 1506 may be performed by, for example, Fig.16 The CJTCSI reporting component 198, cellular RF transceiver 1622 and / or one or more antennas 1680 of the device 1604 are executed.

[0177] In some examples, the UE may receive data in a CJT, such as in conjunction with Fig. 9 The CJT data 970 is described. The CJT may be based at least in part on the CSI report.

[0178] The CSI report may include a first CSI part and a second CSI part, such as a combination of Fig. 9 952 and the second CSI part 954. The first CSI part may have a fixed payload size, and the second CSI part may have a variable payload size indicated in the first CSI part.

[0179] In some examples, the second CSI part may include an indication of beam selection via the SD basis selection field, such as in conjunction with Fig.10 The SD basis selection field may include a first portion indicating the number of oversampled beam groups for each TRP in a plurality of TRPs, and a second portion indicating one or more selected beams for beam selection, as respectively combined with Fig.10The first parameter 1034 and the second parameter 1036 are described.

[0180] In some examples, the first portion can be associated with a first bit width based on a maximum number of TRPs (N) that can be used for the CJT in the plurality of TRPs. TRP ) and the number of oversampled beam groups ( 1 O 2 ). In some examples, the second portion can be associated with a second bit width based on a maximum number of TRPs (N) that can be used for the CJT in the plurality of TRPs. TRP ), the number of beams for each TRP (N 1 N 2 ) and the total number of selected beams (L).

[0181] In some examples, the first CSI portion of the CSI report may include a first indication of one or more selected TRPs in the plurality of TRPs, the first indication indicating a number (N) of the selected TRPs in the plurality of TRPs, such as in conjunction with Fig.11 In some examples, the first indication of one or more selected TRPs may include one of the following: a maximum number of TRPs (N) that can be used for CJT in the plurality of TRPs. TRP ), a bitmap indication of the number of configured combinations of TRPs in a plurality of TRPs, or a CSI resource indicator (CRI) indicating one or more selected TRPs. In some examples, the second CSI portion of the CSI report (e.g., Fig.11 The second CSI portion 1130 of the embodiment may include an indication of beam selection via an SD basis selection field, the SD basis selection field including a first portion indicating a number of oversampled beam groups for each selected TRP in one or more selected TRPs, and a second portion indicating one or more selected beams for beam selection, such as respectively combining Fig.11 In some examples, the first portion may be associated with a first bit width that is based on the number of selected TRPs (N) and the number of oversampled beam groups (O 1 O 2 In some examples, the second portion may be associated with a second bit width that is based on the number of selected TRPs (N), the number of beams for each TRP (N 1 N 2 ) and the total number of selected beams (L). In some examples, the CSI report includes a first indication of a number (N) of selected TRPs among a plurality of TRPs, and an indication of a selected number (L) of SD bases for each TRP among the number (N) of selected TRPs. n)’s second instruction.

[0182] In some examples, the first CSI portion may include a first indication of a number (N) of selected TRPs based on one or more selected TRPs in a plurality of TRPs, such as in conjunction with Fig.12 In some examples, the first indication has a bit width based on the maximum number of TRPs (N) that can be used for CJT in the plurality of TRPs. TRP ). In some examples, the second CSI portion may include an indication of beam selection via an SD basis selection field, the SD basis selection field including a first portion indicating a number of oversampled beam groups for each selected TRP in one or more selected TRPs, a second portion indicating one or more selected TRPs in a plurality of TRPs, and a third portion indicating one or more selected beams for beam selection, such as in combination with Fig.12 In some examples, the first portion may be associated with a second bit width that is based on the number of selected TRPs (N) and the number of oversampled beam groups (O 1 O 2 ). In some examples, the second portion can be associated with a third bit width based on at least one of the following: a maximum number of TRPs (N) in the plurality of TRPs that can be used for the CJT. TRP ) and the number of selected TRPs (N), or the number of TRPs in the plurality of TRPs and the number (N) of configured combinations of selected TRPs. In some examples, the third portion may be associated with a fourth bit width based on the number of selected TRPs (N), the number of beams for each TRP (N), and the number of selected TRPs. 1 N 2 ) and the total number of selected beams (L).

[0183] Fig.161600 is an example of a hardware implementation of an example device 1604. The device 1604 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the device 1604 may include a cellular baseband processor 1624 (also referred to as a modem) coupled to one or more transceivers (e.g., a cellular RF transceiver 1622). The cellular baseband processor 1624 may include on-chip memory 1624'. In some aspects, the device 1604 may also include one or more subscriber identity module (SIM) cards 1620 and an application processor 1606 coupled to a secure digital (SD) card 1608 and a screen 1610. The application processor 1606 may include on-chip memory 1606'. In some aspects, the device 1604 may also include a Bluetooth module 1612, a WLAN module 1614, an SPS module 1616 (e.g., a GNSS module), one or more sensor modules 1618 (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 1626, a power supply 1630, and / or a camera 1632. The Bluetooth module 1612, the WLAN module 1614, and the SPS module 1616 may include an on-chip transceiver (TRX) (or in some cases, only a receiver (RX)). The Bluetooth module 1612, the WLAN module 1614, and the SPS module 1616 may include their own dedicated antennas and / or communicate using one or more antennas 1680. The cellular baseband processor 1624 communicates with the UE 104 and / or with the RU associated with the network entity 1602 via one or more antennas 1680 through a transceiver (e.g., a cellular RF transceiver 1622). The cellular baseband processor 1624 and the application processor 1606 may each include a computer-readable medium / memory, such as an on-chip memory 1624' and an on-chip memory 1606', respectively. The additional memory module 1626 may also be considered a computer-readable medium / memory. Each computer-readable medium / memory (e.g., on-chip memory 1624', on-chip memory 1606', and / or additional memory module 1626) may be non-transitory. The cellular baseband processor 1624 and the application processor 1606 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 1624 / application processor 1606, enables the cellular baseband processor 1624 / application processor 1606 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 1624 / application processor 1606 when executing software.The cellular baseband processor 1624 / application processor 1606 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 1604 may be a processor chip (modem and / or application) and include only the cellular baseband processor 1624 and / or the application processor 1606, while in another configuration, the device 1604 may be the entire UE (e.g., see. Figure 3 350) and includes additional modules of device 1604.

[0184] As discussed above, the CJT CSI reporting component 198 may be configured to: receive a configuration for a CSI report associated with a CJT having multiple TRPs; receive a CSI-RS; and send a CSI report based on measurements performed on the CSI-RS, the CSI report being based on the configuration, the CSI report indicating a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the multiple TRPs and being independent of the selected TRP indicated in the CSI report.

[0185] The CJT CSI reporting component 198 may be within the cellular baseband processor 1624, the application processor 1606, or within both the cellular baseband processor 1624 and the application processor 1606. The CJT CSI 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 of the foregoing.

[0186] As shown, the apparatus 1604 may include various components configured for various functions. For example, the CJT CSI reporting component 198 may include an execution Fig.15 Each block of the algorithm in the flowchart is one or more hardware components.

[0187] In one configuration, the apparatus 1604 (and in particular the cellular baseband processor 1624 and / or the application processor 1606) may include means for receiving a configuration for configuring a CSI report associated with a CJT having multiple TRPs. The example apparatus 1604 also includes means for receiving a CSI-RS. The example apparatus 1604 also includes means for sending a CSI report based on measurements performed on the CSI-RS, the CSI report being based on the configuration, the CSI report indicating a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs of the multiple TRPs and being independent of the selected TRP indicated in the CSI report.

[0188] In another configuration, the example apparatus 1604 further includes means for receiving data in the CJT.

[0189] The means may be the CJT CSI reporting component 198 of the apparatus 1604 configured to perform the functions recited by the means. As described above, the apparatus 1604 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.

[0190] Fig.17 1700 is a flow chart of a method of wireless communication. The method may be performed by a network node (e.g., Fig.18 The method may facilitate reducing the overhead associated with CSI by utilizing the indication redundancy between TRP selection and SD base selection.

[0191] At 1702, the network node sends a configuration for configuring CSI reports associated with multiple TRPs, such as in conjunction with Fig. 9 As described in CJT CSI configuration 910. As an example, the sending of the configuration at 1702 may be performed by Fig.18 The CJTCSI-RS component 199 of the network entity 1802 is executed.

[0192] At 1704, the network node sends a CSI-RS, such as in conjunction with Fig. 9 As described in the CSI-RS 920 of FIG. As an example, the transmission of the CSI-RS at 1704 may be performed by Fig.18 The CJT CSI-RS component 199 of the network entity 1802 is performed.

[0193] At 1706, the network node receives a CSI report based on the configuration and the CSI-RS, the CSI report indicating beam selection for one or more selected beams of the plurality of TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spans all TRPs in the plurality of TRPs and is independent of the selected TRP indicated in the CSI report, as combined with Fig. 9 In some examples, the beam selection may be common to each communication layer using one or more selected beams. As an example, the reception of the CSI report at 1706 may be performed by Fig.18 The CJT CSI-RS component 199 of the network entity 1802 is performed.

[0194] At 1708, the network node sends data in a CJT based at least in part on the CSI report, such as in conjunction with Fig. 9 As described by CJT data 970. As an example, the sending of data at 1708 may be performed by Fig.18 The CJT CSI-RS component 199 of the network entity 1802 is performed.

[0195] In some examples, the configuration may configure the CSI report to include a first CSI part having a fixed payload size and a second CSI part having a variable payload size indicated in the first CSI part.

[0196] In some examples, the second CSI portion may include an indication of beam selection via an SD basis selection field, the SD basis selection field including a first portion indicating a number of oversampled beam groups for each TRP in a plurality of TRPs, and a second portion indicating one or more selected beams for beam selection, such as in combination with Fig.10 The CSI Report 1000 is described.

[0197] In some examples, the first CSI portion may include a first indication of one or more selected TRPs in a plurality of TRPs, the first indication indicating a number (N) of the selected TRPs in the plurality of TRPs, and the second CSI portion includes an indication of beam selection via an SD basis selection field, the SD basis selection field including a first portion indicating a number of oversampled beam groups for each selected TRP in the one or more selected TRPs, and a second portion indicating one or more selected beams of the beam selection, as combined Fig.11 The CSI report 1100 is described.

[0198] In some examples, the first CSI portion may include a first indication of a number of selected TRPs (N) based on one or more selected TRPs in a plurality of TRPs, and the second CSI portion includes an indication of beam selection via an SD basis selection field, the SD basis selection field including a first portion indicating a number of oversampled beam groups for each selected TRP in the one or more selected TRPs, a second portion indicating one or more selected TRPs in the plurality of TRPs, and a third portion indicating one or more selected beams for beam selection, as combined Fig.12 The CSI report 1200 is described.

[0199] In some examples, the first CSI portion includes a first indication of one or more selected TRPs in the plurality of TRPs, the first indication indicating a number (N) of the selected TRPs in the plurality of TRPs. In some examples, the first indication of the one or more selected TRPs includes a maximum number (N) of the TRPs in the plurality of TRPs that can be used for CJT. TRP ). In some examples, the second CSI portion includes an indication of beam selection via an SD basis selection field, the SD basis selection field including a first portion indicating a number of oversampled beam groups for each of one or more selected TRPs, and a second portion indicating one or more selected beams for beam selection. In some examples, the first portion is associated with a first bit width that is based on the number of selected TRPs (N) and the number of oversampled beam groups (O 1 O 2 In some examples, the second portion is associated with a second bit width that is based on the number of selected TRPs (N), the number of beams for each TRP (N 1 N 2 ) and the total number of selected beams (L). In some examples, the CSI report includes a first indication of a number (N) of selected TRPs among a plurality of TRPs, and an indication of a selected number (L) of SD bases for each TRP among the number (N) of selected TRPs. n )’s second instruction.

[0200] Fig.181800 is a diagram illustrating an example of a hardware implementation for a network entity 1802. The network entity 1802 may be a BS, a component of a BS, or may implement BS functionality. The network entity 1802 may include at least one of a CU 1810, a DU 1830, or a RU 1840. For example, depending on the layer functionality handled by the CJT CSI-RS component 199, the network entity 1802 may include a CU 1810; both a CU 1810 and a DU 1830; each of the CU 1810, the DU 1830, and the RU 1840; the DU 1830; both a DU 1830 and a RU 1840; or a RU 1840. The CU 1810 may include a CU processor 1812. The CU processor 1812 may include an on-chip memory 1812'. In some aspects, an additional memory module 1814 and a communication interface 1818 may also be included. CU 1810 communicates with DU 1830 via a midhaul link, such as an F1 interface. DU 1830 may include a DU processor 1832. DU processor 1832 may include on-chip memory 1832'. In some aspects, DU 1830 may also include an additional memory module 1834 and a communication interface 1838. DU 1830 communicates with RU 1840 via a fronthaul link. RU 1840 may include a RU processor 1842. RU processor 1842 may include on-chip memory 1842'. In some aspects, RU 1840 may also include an additional memory module 1844, one or more transceivers 1846, an antenna 1880, and a communication interface 1848. RU 1840 communicates with UE 104. On-chip memory (e.g., on-chip memory 1812', on-chip memory 1832', and / or on-chip memory 1842') and / or additional memory modules (e.g., additional memory module 1814, additional memory module 1834, and / or additional memory module 1844) may each be considered to be a computer-readable medium / memory. Each computer-readable medium / memory may be non-transitory. Each of the CU processor 1812, the DU processor 1832, and the RU processor 1842 is responsible for general processing, including executing software stored on the computer-readable medium / memory. The software, when executed by the corresponding processor, enables the processor to perform the various functions described above. The computer-readable medium / memory may also be used to store data manipulated by the processor when executing the software.

[0201] As discussed above, the CJT CSI-RS component 199 may be configured to: send a configuration of a CSI report associated with multiple TRPs; send a CSI-RS; receive a CSI report based on the configuration and the CSI-RS, the CSI report indicating a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spans all TRPs in the multiple TRPs and is independent of the selected TRP indicated in the CSI report; and send data in the CJT based at least in part on the CSI report.

[0202] The CJT CSI-RS component 199 may be within one or more processors of one or more of the CU 1810, DU 1830, and RU 1840. The CJT CSI-RS component 199 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 of the above.

[0203] The network entity 1802 may include various components configured for various functions. For example, the CJT CSI-RS component 199 may include a processor that performs Fig.17 Each block of the algorithm in the flowchart is one or more hardware components.

[0204] In one configuration, the network entity 1802 may include means for sending a configuration of a CSI report associated with multiple TRPs. The example network entity 1802 also includes means for sending a CSI-RS. The example network entity 1802 also includes means for receiving a CSI report based on the configuration and the CSI-RS, the CSI report indicating a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the multiple TRPs and independent of the selected TRP indicated in the CSI report. The example network entity 1802 also includes means for sending data in the CJT based at least in part on the CSI report.

[0205] These means may be the CJT CSI-RS component 199 of the network entity 1802 configured to perform the functions recited by the means. As described above, the network entity 1802 may include the TX processor 316, the RX processor 370, and the controller / processor 375. Thus, in one configuration, the means may be the TX processor 316, the RX processor 370, and / or the controller / processor 375 configured to perform the functions recited by the means.

[0206] In some aspects of wireless communication, joint transmission across multiple TRPs may be implemented. The joint transmission may be non-coherent JT (NCJT) where data (layers) may be pre-coded separately on different TRPs, or may be CJT where the same layer may be transmitted via multiple TRPs with phase coherence.

[0207] Various aspects disclosed herein provide techniques for exploiting the relationship between TRP selection and SD base selection to improve communication performance, for example, by reducing the overhead associated with indicating the TRP selection and the SD base selection. In some examples, the number of selected SD bases (e.g., L beams) may be configured to the UE and may represent the total number of selected SD bases across all TRPs and may be independent of the N TRPs indicated in the CSI report.

[0208] It should be understood that the specific order or hierarchy of the blocks in the disclosed process / flowchart is only an illustration of the exemplary method. It should be understood that the specific order or hierarchy of the blocks in the process / flowchart can be rearranged based on design preferences. Further, some blocks can be combined or omitted. The attached method claims provide the elements of various blocks in a sample order, but are not limited to the specific order or hierarchy provided.

[0209] 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 "at ..." do not mean a direct temporal relationship or reaction. That is, these phrases, such as "when ...", do not mean an immediate 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 immediate time limit is required for the occurrence of the action. 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, and 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, the data may be directly received / sent between the first device and the second device, or indirectly received / sent between the first device and the second device through a collection of devices. A device configured to "output" data (such as, sending, signaling, or messages) may, for example, send the data with a transceiver, or may transmit the data to a device that sends the data. A device configured to "obtain" data (such as, sending, signaling, or messages) may, for example, receive data with a transceiver, or may obtain the data from a device that receives the data. The information stored in the memory includes instructions and / or data. All structural and functional equivalents of the elements of the various aspects described throughout the present disclosure that are known or will later be known to those of ordinary skill in the art are expressly incorporated herein by reference and are covered by the claims.Furthermore, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly stated in the claims. Words such as "module," "mechanism," "element," "device," etc. cannot replace the word "component." Thus, no claim element will be construed as a component plus function unless the element is explicitly stated using the phrase "component for..."

[0210] 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.

[0211] The following aspects are merely illustrative and may be combined with other aspects or teachings described herein without limitation.

[0212] Aspect 1 is a method for wireless communication at a UE, comprising: receiving a configuration for a CSI report associated with a CJT having multiple TRPs; receiving a CSI-RS; and sending the CSI report based on measurements performed on the CSI-RS, the CSI report being based on the configuration, the CSI report indicating a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the multiple TRPs and being independent of the selected TRP indicated in the CSI report.

[0213] Aspect 2 is a method according to aspect 1, further comprising: the CSI report includes a first CSI part and a second CSI part, the first CSI part has a fixed payload size, and the second CSI part has a variable payload size indicated in the first CSI part.

[0214] Aspect 3 is a method according to any one of Aspects 1 and 2, further comprising: the first CSI part includes a first indication of one or more selected TRPs among the multiple TRPs, the first indication indicating the number (N) of selected TRPs among the multiple TRPs.

[0215] Aspect 4 is a method according to any one of aspects 1 to 3, further comprising: the first indication of the one or more selected TRPs includes a maximum number (N) of TRPs that can be used for the CJT among the multiple TRPs. TRP ) bitmap indication.

[0216] Aspect 5 is a method according to any one of Aspects 1 to 4, further comprising: the second CSI part includes an indication of the beam selection via an SD base selection field, the SD base selection field including: a first part, the first part indicating the number of oversampled beam groups for each selected TRP in the one or more selected TRPs; and a second part, the second part indicating the one or more selected beams of the beam selection.

[0217] Aspect 6 is a method according to any one of aspects 1 to 5, further comprising: the first portion is associated with a first bit width, the first bit width being based on the number (N) of selected TRPs and the number of oversampled beam groups (O 1 P 2 ).

[0218] Aspect 7 is a method according to any one of aspects 1 to 6, further comprising: the second portion is associated with a second bit width, the second bit width being based on the number of selected TRPs (N), the number of beams for each TRP (N 1 N 2 ) and the total number (L) of selected beams.

[0219] Aspect 8 is a method according to any one of aspects 1 to 7, further comprising: the CSI report includes a first indication of a number (N) of selected TRPs in the plurality of TRPs, and an indication of a selected number (L) of SD bases for each TRP in the number (N) of selected TRPs. n )’s second instruction.

[0220] Aspect 9 is a method according to any one of Aspects 1 and 2, further comprising: the first CSI part includes a first indication, the first indication indicating the number (N) of selected TRPs based on one or more selected TRPs among the multiple TRPs.

[0221] Aspect 10 is a method according to any one of aspects 1 and 9, further comprising: the first indication has a bit width, the bit width being based on a maximum number (N) of TRPs that can be used for the CJT among the plurality of TRPs. TRP ).

[0222] Aspect 11 is a method according to any one of Aspects 1 and 9 to 10, further comprising: the second CSI part includes an indication of the beam selection via an SD base selection field, the SD base selection field including: a first part, the first part indicating the number of oversampled beam groups for each selected TRP in the one or more selected TRPs; a second part, the second part indicating the one or more selected TRPs in the multiple TRPs; and a third part, the third part indicating the one or more selected beams of the beam selection.

[0223] Aspect 12 is a method according to any one of aspects 1 and 9 to 11, further comprising: the first portion is associated with a second bit width, the second bit width being based on the number (N) of selected TRPs and the number of oversampled beam groups (O 1 O 2 ).

[0224] Aspect 13 is a method according to any one of aspects 1 and 9 to 12, further comprising: the second portion is associated with a third bit width, the third bit width being based on at least one of the following: a maximum number of TRPs (N) in the plurality of TRPs that can be used for the CJT; TRP ) and the number (N) of selected TRPs, or the number of configuration combinations of the TRPs among the multiple TRPs and the number (N) of selected TRPs.

[0225] Aspect 14 is a method according to any one of aspects 1 and 9 to 13, further comprising: the third part is associated with a fourth bit width, the fourth bit width being based on the number (N) of selected TRPs, the number of beams for each TRP (N 1 N 2 ) and the total number (L) of selected beams.

[0226] Aspect 15 is a method according to any one of Aspects 1 and 2, further comprising: the second CSI part includes an indication of the beam selection via an SD base selection field, the SD base selection field including: a first part, the first part indicating the number of oversampled beam groups for each TRP in the multiple TRPs; and a second part, the second part indicating the one or more selected beams of the beam selection.

[0227] Aspect 16 is a method according to any one of aspects 1 and 14 to 15, further comprising: the first portion is associated with a first bit width, the first bit width being based on a maximum number (N) of TRPs that can be used for the CJT among the plurality of TRPs. TRP ) and the number of oversampled beam groups ( 1 O 2 ).

[0228] Aspect 17 is a method according to any one of aspects 1 and 14 to 16, further comprising: the second portion is associated with a second bit width, the second bit width being based on the maximum number (N) of TRPs that can be used for the CJT in the plurality of TRPs. TRR ), the number of beams for each TRP (N 1 N 2 ) and the total number (L) of selected beams.

[0229] Aspect 18 is a method according to any one of aspects 1 and 14 to 17, further comprising: the beam selection is common to each communication layer using the one or more selected beams.

[0230] Aspect 19 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 18.

[0231] In aspect 20, the apparatus of aspect 19 further comprises at least one antenna coupled to the at least one processor.

[0232] In aspect 21, the apparatus according to aspect 19 or 20 further comprises a transceiver coupled to the at least one processor.

[0233] Aspect 22 is an apparatus for wireless communication, comprising means for implementing any one of aspects 1 to 18.

[0234] In aspect 23, the apparatus according to aspect 22 further comprises at least one antenna coupled to the means for performing the method according to any one of aspects 1 to 18.

[0235] In aspect 24, the apparatus according to aspect 22 or 23 further comprises a transceiver coupled to the means for performing the method according to any one of aspects 1 to 18.

[0236] Aspect 25 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 18.

[0237] Aspect 26 is a method for wireless communication at a network entity, comprising: sending a configuration of a CSI report associated with multiple TRPs; sending a CSI-RS; receiving the CSI report based on the configuration and the CSI-RS, the CSI report indicating a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spans all TRPs in the multiple TRPs and is independent of the selected TRP indicated in the CSI report; and sending data in a coherent joint transmission (CJT) based at least in part on the CSI report.

[0238] Aspect 27 is a method according to Aspect 26, further comprising: the configuration configures the CSI report to include a first CSI part and a second CSI part, the first CSI part has a fixed payload size, and the second CSI part has a variable payload size indicated in the first CSI part.

[0239] Aspect 28 is a method according to any one of Aspects 26 and 27, further comprising: the first CSI part includes a first indication of one or more selected TRPs among the multiple TRPs, the first indication indicating the number (N) of selected TRPs among the multiple TRPs.

[0240] Aspect 29 is a method according to any one of aspects 26 to 28, further comprising: the first indication of the one or more selected TRPs includes a maximum number (N) of TRPs that can be used for the CJT among the multiple TRPs. TRP ) bitmap indication.

[0241] Aspect 30 is a method according to any one of Aspects 26 to 29, further comprising: the second CSI part includes an indication of the beam selection via an SD base selection field, the SD base selection field including: a first part, the first part indicating the number of oversampled beam groups for each selected TRP in the one or more selected TRPs; and a second part, the second part indicating the one or more selected beams of the beam selection.

[0242] Aspect 31 is a method according to any one of aspects 26 to 30, further comprising: the first portion is associated with a first bit width, the first bit width being based on the number (N) of selected TRPs and the number of oversampled beam groups (O 1 O 2 ).

[0243] Aspect 32 is a method according to any one of aspects 26 to 31, further comprising: the second portion is associated with a second bit width, the second bit width being based on the number of selected TRPs (N), the number of beams for each TRP (N 1 N 2 ) and the total number (L) of selected beams.

[0244] Aspect 33 is a method according to any one of aspects 26 and 27, further comprising: the CSI report includes a first indication of a number (N) of selected TRPs in the plurality of TRPs, and an indication of a selected number (L) of SD bases for each TRP in the number (N) of selected TRPs. n )’s second instruction.

[0245] Aspect 34 is a method according to any one of Aspects 26 and 27, further comprising: the second CSI part includes an indication of the beam selection via an SD base selection field, the SD base selection field including: a first part, the first part indicating the number of oversampled beam groups for each TRP in the multiple TRPs; and a second part, the second part indicating the one or more selected beams of the beam selection.

[0246] Aspect 35 is a method according to any one of Aspects 26 and 27, further comprising: the first CSI part includes a first indication of one or more selected TRPs among the multiple TRPs, the first indication indicating the number (N) of selected TRPs among the multiple TRPs, and the second CSI part includes an indication of the beam selection via an SD base selection field, the SD base selection field including: a first part, the first part indicating the number of oversampled beam groups for each selected TRP among the one or more selected TRPs; and a second part, the second part indicating the one or more selected beams of the beam selection.

[0247] Aspect 36 is a method according to any one of Aspects 26 and 27, further comprising: the first CSI part includes a first indication of the number (N) of selected TRPs based on one or more selected TRPs among the multiple TRPs, and the second CSI part includes an indication of the beam selection via an SD base selection field, the SD base selection field including: a first part, the first part indicating the number of oversampled beam groups for each selected TRP among the one or more selected TRPs; a second part, the second part indicating the one or more selected TRPs among the multiple TRPs; and a third part, the third part indicating the one or more selected beams of the beam selection.

[0248] Aspect 37 is a method according to any one of aspects 26 to 36, further comprising: the beam selection is common to each communication layer using the one or more selected beams.

[0249] Aspect 38 is an apparatus for wireless communication at a network entity, comprising: at least one processor coupled to a memory and configured to implement any one of aspects 26 to 37.

[0250] In aspect 39, the apparatus of aspect 38 further comprises at least one antenna coupled to the at least one processor.

[0251] In aspect 40, the apparatus according to aspect 38 or 39 further comprises a transceiver coupled to the at least one processor.

[0252] Aspect 41 is an apparatus for wireless communication, comprising means for implementing any one of aspects 26 to 37.

[0253] In aspect 42, the apparatus according to aspect 41 further comprises at least one antenna coupled to the means for performing the method according to any one of aspects 26 to 37.

[0254] In aspect 43, the apparatus according to aspect 41 or 42 further comprises a transceiver coupled to the means for performing the method according to any one of aspects 26 to 37.

[0255] Aspect 44 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 26 to 37.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; as well as at least one processor coupled to the memory and configured to: receiving a configuration of a channel state information (CSI) report associated with a coherent joint transmission (CJT) having a plurality of transmit receive points (TRPs); receiving a CSI reference signal (CSI-RS); and The CSI report is sent based on measurements performed on the CSI-RS, the CSI report is based on the configuration, the CSI report indicates a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicates a total number of selected beams, and the total number of selected beams spans all TRPs in the multiple TRPs and is independent of the selected TRP indicated in the CSI report.

2. The apparatus of claim 1, wherein the CSI report comprises a first CSI part and a second CSI part, the first CSI part having a fixed payload size, and the second CSI part having a variable payload size indicated in the first CSI part.

3. The apparatus of claim 2, wherein the first CSI portion comprises a first indication of one or more selected TRPs among the plurality of TRPs, the first indication indicating a number (N) of the selected TRPs among the plurality of TRPs.

4. The apparatus of claim 3 , wherein the first indication of the one or more selected TRPs comprises a maximum number (N ) of the plurality of TRPs that can be used for the CJT. TRP ) bitmap indication.

5. The apparatus of claim 3, wherein the second CSI part comprises an indication of the beam selection via a spatial domain (SD) basis selection field, the SD basis selection field comprising: a first portion indicating a number of oversampled beam groups for each selected TRP of the one or more selected TRPs; and a second portion indicating the one or more selected beams of the beam selection.

6. The apparatus of claim 5, wherein the first portion is associated with a first bit width, the first bit width being based on the number (N) of selected TRPs and the number (O1O2) of oversampled beam groups.

7. The apparatus of claim 6, wherein the second portion is associated with a second bit width, the second bit width being based on the number of selected TRPs (N), the number of beams for each TRP (N1N2), and the total number of selected beams (L).

8. The apparatus of claim 2, wherein the CSI report comprises a first indication of a number (N) of selected TRPs in the plurality of TRPs, and a first indication of a selected number (L) of SD bases for each TRP in the number (N) of selected TRPs. n )’s second instruction.

9. The apparatus of claim 2, wherein the first CSI portion comprises a first indication indicating a number (N) of selected TRPs based on one or more selected TRPs from among the plurality of TRPs.

10. The apparatus of claim 9, wherein the first indication has a bit width based on a maximum number of TRPs (N ) among the plurality of TRPs that can be used for the CJT. TRP ).

11. The apparatus of claim 9, wherein the second CSI part comprises an indication of the beam selection via a spatial domain (SD) basis selection field, the SD basis selection field comprising: a first portion indicating a number of oversampled beam groups for each selected TRP of the one or more selected TRPs; a second portion indicating the one or more selected TRPs of the plurality of TRPs; and a third portion indicating the one or more selected beams of the beam selection.

12. The apparatus of claim 11, wherein the first portion is associated with a second bit width, the second bit width being based on the number (N) of selected TRPs and the number (O1O2) of oversampled beam groups.

13. The apparatus of claim 12, wherein the second portion is associated with a third bit width, the third bit width being based on at least one of: The maximum number of TRPs (N) among the plurality of TRPs that can be used for the CJT TRP ) and the number (N) of selected TRPs, or The number of configuration combinations of the TRP among the plurality of TRPs and the number (N) of selected TRPs.

14. The apparatus of claim 13, wherein the third portion is associated with a fourth bit width, the fourth bit width being based on the number of selected TRPs (N), the number of beams for each TRP (N1N2), and the total number of selected beams (L).

15. The apparatus of claim 2, wherein the second CSI part comprises an indication of the beam selection via a spatial domain (SD) basis selection field, the SD basis selection field comprising: a first portion indicating a number of oversampled beam groups for each TRP in the plurality of TRPs; and a second portion indicating the one or more selected beams of the beam selection.

16. The apparatus of claim 15 , wherein the first portion is associated with a first bit width, the first bit width being based on a maximum number of TRPs (N ) of the plurality of TRPs that can be used for the CJT. TRP ) and the number of oversampled beam groups (O1O2).

17. The apparatus of claim 16, wherein the second portion is associated with a second bit width, the second bit width being based on the maximum number (N) of TRPs that can be used for the CJT in the plurality of TRPs. TRP ), the number of beams for each TRP (N1N2) and the total number of selected beams (L).

18. The apparatus of claim 1, wherein the beam selection is common to each communication layer using the one or more selected beams.

19. The apparatus according to claim 1, further comprising: At least one transceiver or at least one antenna, the at least one transceiver or at least one antenna coupled to the at least one processor and configured to send the CSI report.

20. A method of wireless communication at a user equipment (UE), comprising: receiving a configuration of a channel state information (CSI) report associated with a coherent joint transmission (CJT) having a plurality of transmit receive points (TRPs); receiving a CSI reference signal (CSI-RS); and The CSI report is sent based on measurements performed on the CSI-RS, the CSI report is based on the configuration, the CSI report indicates a beam selection for one or more selected beams of the multiple TRPs, the beam selection indicates a total number of selected beams, and the total number of selected beams spans all TRPs in the multiple TRPs and is independent of the selected TRP indicated in the CSI report.

21. An apparatus for wireless communication, comprising: Memory; as well as at least one processor coupled to the memory and configured to: Transmit configuration of a channel state information (CSI) report associated with a plurality of transmit reception points (TRPs); Sending a CSI reference signal (CSI-RS); receiving the CSI report based on the configuration and the CSI-RS, the CSI report indicating a beam selection for one or more selected beams of the plurality of TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the plurality of TRPs and independent of the selected TRP indicated in the CSI report; as well as Data is transmitted in a coherent joint transmission (CJT) based at least in part on the CSI report.

22. The apparatus of claim 21, wherein the configuration configures the CSI report to include a first CSI part and a second CSI part, the first CSI part having a fixed payload size, and the second CSI part having a variable payload size indicated in the first CSI part.

23. The apparatus of claim 22, wherein the first CSI portion comprises a first indication of one or more selected TRPs among the plurality of TRPs, the first indication indicating a number (N) of the selected TRPs among the plurality of TRPs.

24. The apparatus of claim 23, wherein the first indication of the one or more selected TRPs comprises a maximum number (N) of the plurality of TRPs that can be used for the CJT. TRP ) bitmap indication.

25. The apparatus of claim 23, wherein the second CSI part comprises an indication of the beam selection via a spatial domain (SD) basis selection field, the SD basis selection field comprising: a first portion indicating a number of oversampled beam groups for each selected TRP of the one or more selected TRPs; and a second portion indicating the one or more selected beams of the beam selection.

26. The apparatus of claim 25, wherein the first portion is associated with a first bit width, the first bit width being based on the number (N) of selected TRPs and a number (O1O2) of oversampled beam groups.

27. An apparatus according to claim 26, wherein the second portion is associated with a second bit width, and the second bit width is based on the number of selected TRPs (N), the number of beams for each TRP (N1N2), and the total number of selected beams (L).

28. The apparatus of claim 22, wherein the CSI report comprises a first indication of a number (N) of selected TRPs of the plurality of TRPs, and a first indication of a selected number (L) of SD bases for each TRP of the number (N) of selected TRPs. n )’s second instruction.

29. The apparatus of claim 21, further comprising: At least one transceiver or at least one antenna coupled to the at least one processor and configured to receive the CSI report.

30. A method of wireless communication, comprising: Transmit configuration of a channel state information (CSI) report associated with a plurality of transmit reception points (TRPs); Sending a CSI reference signal (CSI-RS); receiving the CSI report based on the configuration and the CSI-RS, the CSI report indicating a beam selection for one or more selected beams of the plurality of TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams spanning all TRPs in the plurality of TRPs and independent of the selected TRP indicated in the CSI report; as well as Data is transmitted in a coherent joint transmission (CJT) based at least in part on the CSI report.

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