High rank codebook and control signaling design for 8Tx uplink MIMO

Abstract

A user equipment (UE) receives control signaling for uplink MIMO transmission, the control signaling including a first TPMI field and a second TPMI field and an SRS resource set indicator; and transmitting the uplink MIMO transmission precoded with an 8-port uplink MIMO pre-decoder, the 8-port uplink MIMO pre-decoder based on a 4-port uplink MIMO codebook having a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator, and transmitting the uplink MIMO transmission precoded with an 8-port uplink MIMO pre-decoder, the 8-port uplink MIMO pre-decoder based on the 4-port uplink MIMO codebook having a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator.

Description

Technical Field

[0001] The present disclosure relates generally to communication systems, and more particularly to codebook based uplink transmissions. Background Art

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

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

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

[0005] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus is configured to: receive control signaling for uplink MIMO transmission, the control signaling including a first TPMI field and a second TPMI field and an SRS resource set indicator; and transmit an uplink MIMO transmission pre-decoded using an 8-port uplink MIMO pre-decoder based on a 4-port uplink MIMO codebook with a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator.

[0006] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus is configured to: output control signaling for uplink MIMO transmission for transmission, the control signaling comprising a first TPMI field, a second TPMI field, and an SRS resource set indicator; and receive an uplink MIMO transmission pre-decoded using an 8-port uplink MIMO pre-decoder based on a 4-port uplink MIMO codebook with a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator.

[0007] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus is configured to receive control signaling for UL MIMO transmission; and to transmit UL MIMO transmission pre-coded with an 8-port uplink MIMO pre-decoder based on the control signaling and a set of two or more antenna port groups.

[0008] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus is configured to output control signaling for UL MIMO transmission for transmission; and obtain UL MIMO transmission pre-coded by an 8-port uplink MIMO pre-decoder based on the control signaling and a set of two or more antenna port groups.

[0009] To achieve the aforementioned and related purposes, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail some exemplary features of one or more aspects. However, these features indicate only some of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[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 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 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 4 An example UE in communication with a network node according to various aspects of the present disclosure is illustrated.

[0017] Figure 5 An example communication flow between a network node and a UE according to various aspects of the present disclosure is illustrated.

[0018] Figure 6 Depicted are tables illustrating example mappings of SRS resource set indicators to SRI and TPMI fields in accordance with various aspects of the present disclosure.

[0019] Figure 7 Depicted are tables that map values ​​of a first TPMI field to a rank and precoding matrix for a first repetition set to facilitate uplink 4Tx MIMO in accordance with various aspects of the present disclosure.

[0020] Figure 8 Depicted is a table that maps values ​​of a second TPMI field to a precoding matrix for a second repetition set to facilitate uplink 4Tx MIMO in accordance with various aspects of the present disclosure.

[0021] Fig. 9 Depicted is a table storing a codebook subset for a precoding matrix W for a single layer transmission for a UE with four antenna ports in accordance with various aspects of the present disclosure.

[0022] Fig.10 Depicted is a table storing a codebook subset of the precoding matrix W for two-layer transmission for a UE with four antenna ports as presented herein.

[0023] Fig.11 Depicted is a table storing a codebook subset of a precoding matrix W for three-layer transmission for a UE with four antenna ports as presented herein.

[0024] Fig.12Depicted is a table of a codebook subset storing a precoding matrix W for four-layer transmission for a UE with four antenna ports as presented herein.

[0025] Fig.13 An example UE in communication with a network node according to various aspects of the present disclosure is illustrated.

[0026] Fig.14 A table including example 8Tx precoding matrix types for ranks 1 to 8 as presented herein is depicted.

[0027] Fig.15 The communication flow between a network node and a UE as presented herein is illustrated.

[0028] Fig.16 Depicted is an example table that facilitates mapping of type indicator and TPMI fields to an 8Tx precoding matrix as presented herein.

[0029] Fig.17 The communication flow between a network node and a UE as presented herein is illustrated.

[0030] Fig.18 Depicted is a table that facilitates mapping the type indicator, modified SR field, and TPMI field to the 8Tx precoding matrix as presented herein.

[0031] Fig.19 Depicted is a table that facilitates mapping the type indicator, modified SR field, and TPMI field to the 8Tx precoding matrix as presented herein.

[0032] Fig. 20 The communication flow between a network node and a UE as presented herein is illustrated.

[0033] Fig.21 Depicted is a table that facilitates mapping of type indicator and TPMI fields to an 8Tx precoding matrix as presented herein.

[0034] Fig. 22 Depicted is a table that facilitates mapping of type indicator and TPMI fields to an 8Tx precoding matrix as presented herein.

[0035] Fig.23 The communication flow between a network node and a UE as presented herein is illustrated.

[0036] Fig.24 Depicted is a table including precoding matrix types for rank 1 to rank 4 as presented herein.

[0037] Fig.25 Depicted is 2500 including precoding matrix types for rank 5 through rank 8 as presented herein.

[0038] Fig.26 An example of an 8Tx fully coherent (FC) codebook structure as presented herein is illustrated.

[0039] Fig. 27 Depicted is a table that facilitates mapping of type indicator and TPMI fields to an 8Tx precoding matrix as presented herein.

[0040] Fig.28 Depicted is a table that facilitates mapping of type indicator and TPMI fields to an 8Tx precoding matrix as presented herein.

[0041] Fig.29 The communication flow between a network node and a UE as presented herein is illustrated.

[0042] Figures 30 to 47 An example table illustrating uplink precoding matrix indication for ranks 1 through 8 as presented herein is depicted.

[0043] Fig.48 An example table showing the TPMI bit fields mapped to codebook subsets is illustrated.

[0044] Fig.49 An example table showing the TPMI bit fields mapped to layers for transmission is illustrated.

[0045] Fig.50 Example precoding matrices for rank-5, rank-6, rank-7, and rank-8 UL MIMO transmissions are illustrated.

[0046] Fig.51 Example precoding matrices for rank-5, rank-6, rank-7, and rank-8 UL MIMO transmissions are illustrated.

[0047] Fig.52 Example precoding matrices for rank-5, rank-6, rank-7, and rank-8 UL MIMO transmissions are illustrated.

[0048] Fig.53 Example precoders for rank-5, rank-6, rank-7, and rank-8 UL MIMO transmissions are illustrated.

[0049] Fig.54 Example precoders for rank-5, rank-6, rank-7, and rank-8 UL MIMO transmissions are illustrated.

[0050] Fig.55A , Fig.55B and Fig.55C Example antenna port groups are illustrated.

[0051] Fig.55D Example bit fields mapped to codebook subsets for UL MIMO transmission are illustrated.

[0052] Fig.55E An example communication flow between a UE and a base station in conjunction with antenna port groups is illustrated.

[0053] Fig.56A and Fig.56B Example aspects of configuring SRS resources for antenna ports in an antenna port group are illustrated.

[0054] Fig.57A is a flow chart of a method of wireless communication.

[0055] Fig.57B is a flow chart of a method of wireless communication.

[0056] Fig.58A is a flow chart of a method of wireless communication.

[0057] Fig.58B is a flow chart of a method of wireless communication.

[0058] Fig.59 is a diagram illustrating an example of a hardware implementation for an example apparatus and / or UE.

[0059] Fig.60A is a flow chart of a method of wireless communication.

[0060] Fig.60B is a flow chart of a method of wireless communication.

[0061] Fig.61A is a flow chart of a method of wireless communication.

[0062] Fig.61B is a flow chart of a method of wireless communication.

[0063] Fig.62 is a diagram illustrating an example of a hardware implementation for an example network entity. DETAILED DESCRIPTION

[0064] As wireless communication technology evolves, additional types of UEs may be supported, generally referred to herein as "advanced UEs." Advanced UEs may include smartphones, indoor customer premises equipment (CPE), outdoor CPE, laptop computers, etc. Advanced UEs may be associated with higher reliability and / or improved efficiency compared to non-advanced UEs. Advanced UEs may include more than four antennas, such as Figure 4 The advanced UE may also or alternatively have more relevant power constraints. In addition, the advanced UE may support more than four downlink layers and / or four uplink transmit ports. The advanced UE may also support new DMRS, SRS and / or codebook designs.

[0065] Since consideration is being given to increasing the number of transmit antennas (Tx) (e.g., more than four transmit antennas) for advanced UEs (e.g., mobile devices, larger size devices, etc.) utilizing 5G technology, supporting 8-port uplink transmission may be beneficial for improving 5G performance.

[0066] For 8-port uplink transmission, a new codebook for precoding and related precoding scheduling information in DCI can be used. The first type of codebook can support uplink transmission with disabled precoding. This codebook can use a new design for 8 ports. In addition, the new design can be used for ranks 5 to 8 (e.g., five-layer, six-layer, seven-layer, or eight-layer uplink transmission). The second type of codebook type can support uplink transmission with enabled precoding. This codebook can use a new design for 8 ports.

[0067] Therefore, it can be understood that 8Tx uplink MIMO can adopt 8Tx uplink operation to support four or more layers per UE in uplink transmission. To achieve 8Tx uplink operation, uplink DMRS, SRS, SRS resource indicator (SRI) and / or TPMI (including codebook) can be updated.

[0068] Aspects disclosed herein facilitate 8Tx uplink MIMO. Example techniques include: reusing a 4Tx codebook and / or TPMI table; generating a new 8Tx codebook; and controlling signaling to indicate to the UE a precoder to use when employing 8Tx uplink MIMO.

[0069] The specific embodiments described below in conjunction with the accompanying drawings are descriptions of various configurations and do not represent the only configurations in which the concepts described herein can be practiced. In order to provide a thorough understanding of the various concepts, the specific embodiments include specific details. However, these concepts can be practiced without these specific details. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0070] Several aspects of telecommunication systems are 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 may be implemented using electronic hardware, computer software, or any combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0071] As an 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, gated logic components, discrete hardware circuits, and other suitable hardware configured to perform various functionalities described throughout the present disclosure. One or more processors in a processing system 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.

[0072] Thus, in one or more example aspects, specific implementations and / or use cases, the described functionality may be implemented in hardware, software, or any combination thereof. In the case of implementation in software, the functionality may be stored or decoded as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media. Storage media may be any available media that can be accessed by a computer. For example, such computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0073] 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, various aspects, specific implementations and / or use cases can be generated via integrated chip specific implementations and other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / purchase equipment, medical equipment, artificial intelligence (AI) enabled devices, etc.). Although some examples may or may not be specifically for use cases or applications, the described examples may have a wide range of applicability. Various aspects, specific implementations and / or use cases can be in the range from chip-level or modular components to non-modular, non-chip-level specific implementations, and further to the range of aggregated, distributed or original equipment manufacturer (OEM) devices or systems in conjunction with one or more technologies herein. In some actual settings, the equipment combined with the various aspects and features described may also include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals necessarily include several components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, 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.

[0074] The deployment of a communication system (such as a 5G NR system) can be arranged with various components or components 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) that perform base station functionality can be implemented in an aggregated or decomposed architecture. For example, a BS (such as a Node B (NB), an evolved NB (eNB), an NR BS, a 5GNB, 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.

[0075] 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).

[0076] Base station operation or network design may take into account the aggregated nature of base station functionality. For example, a disaggregated base station may be used in an integrated access 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 functionality across two or more units at various physical locations, as well as virtually distributing functionality of at least one unit, which may enable flexibility in network design. Individual units of a disaggregated base station or disaggregated RAN architecture may be configured for wired or wireless communication with at least one other unit.

[0077] 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) 125 via an E2 link, or a non-real-time (non-RT) RIC 115 associated with a service management and orchestration (SMO) framework (e.g., SMO framework 105), or both. CU 110 may communicate with one or more DUs (e.g., DU 130) via corresponding midhaul links (such as F1 interfaces). DU 130 may communicate with one or more RUs (e.g., RU 140) via corresponding fronthaul links. RU 140 may communicate with corresponding UEs (e.g., UE 104) via one or more radio frequency (RF) access links. In some implementations, UE 104 may be served by multiple RUs simultaneously.

[0078] Each of the units (i.e., CU (e.g., CU 110), DU (e.g., DU 130), RU (e.g., RU 140), and near-RT RIC (e.g., near-RT RIC 125), non-RT RIC (e.g., non-RT RIC 115), and SMO framework 105) may include or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units or an associated processor or controller that provides instructions to the communication interfaces of these units may be configured to communicate with one or more of the other units via the transmission medium. For example, these units may include a wired interface configured to receive signals or transmit signals to one or more of the other units via the wired transmission medium. Additionally, these units may include a wireless interface that may include a receiver, a transmitter, or a transceiver (such as an RF transceiver) configured to receive and / or transmit signals to one or more of the other units via a wireless transmission medium.

[0079] 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 as having an interface configured to communicate signals with other control functions hosted by CU 110. CU110 may be configured to handle user plane functionality (i.e., central unit-user plane (CU-UP)), control plane functionality (i.e., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, CU 110 may be logically split 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.

[0080] DU 130 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs. In some aspects, DU 130 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) coding and decoding, scrambling, modulation and demodulation, etc.) at least in part according to functional splits (such as those defined by 3GPP). In some aspects, DU 130 may also host one or more low PHY layers. Each layer (or module) may be implemented with 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.

[0081] Lower layer functionality may be implemented by one or more RUs. In some deployments, the RU 140 controlled by the DU 130 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.) or both based at least in part on functional splitting (such as lower layer functional splitting). In this architecture, the RU 140 may be implemented to handle 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).

[0082] 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, CU, DU, RU, and near-RT RIC. 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 .

[0083] 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.

[0084] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 125, the non-RT RIC 115 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 125 and may be received from a non-network data source or from a network function at the SMO framework 105 or the non-RT RIC 115. In some examples, the non-RT RIC 115 or the near-RT RIC 125 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 115 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 105 (such as via reconfiguration of O1) or via the creation of RAN management policies (such as A1 policies).

[0085] At least one of the CU 110, the DU 130, and the RU 140 may be referred to as a base station 102. Therefore, the base station 102 may include one or more of the CU 110, the DU 130, and the RU 140 (each component is indicated by a dotted line to indicate that each component may be included in the base station 102 or may not be included in the base station). The base station 102 provides an access point to the core network 120 for the UE 104. The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). Small cells include femto cells, pico cells, and micro cells. A network including both small cells and macro cells may be referred to as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB), which may provide services to a restricted group referred to as a closed subscriber group (CSG). The communication link between a RU (e.g., RU 140) and a UE (e.g., UE 104) may include an uplink (UL) (also referred to as a reverse link) transmission from UE 104 to RU 140 and / or a downlink (DL) (also referred to as a forward link) transmission from RU 140 to UE 104. The communication link may use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming and / or transmit diversity. The communication link may be through one or more carriers. For each carrier allocated in a carrier aggregation of up to YxMHz (x component carriers) for transmission in each direction, the base station 102 / UE 104 may use a spectrum of up to YMHz (e.g., 5MHz, 10MHz, 15MHz, 20MHz, 100MHz, 400MHz, etc.) bandwidth. The carriers may or may not be adjacent to each other. The allocation of carriers may be equivalent to DL and UL asymmetric (e.g., more or fewer carriers may be allocated to DL than 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).

[0086] 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 sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communications may be through a variety of wireless D2D communication systems, such as, for example, Bluetooth, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0087] 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.

[0088] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to 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).

[0089] 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 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, higher frequency bands are currently being explored to extend 5G NR operations 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.

[0090] In view of the above, unless otherwise specified, when the term "below 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, when 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.

[0091] The base station 102 and the UE 104 may each include multiple antennas (such as antenna elements, antenna panels, and / or antenna arrays) to facilitate beamforming. The base station 102 may send a beamformed signal 182 to the UE 104 in one or more transmit directions. The UE 104 may receive the beamformed signal from the base station 102 in one or more receive directions. The UE 104 may also send a beamformed signal 184 to the base station 102 in one or more transmit directions. The base station 102 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 102 / UE 104 may perform beam training to determine the best receive direction and transmit direction for each of the base station 102 / UE 104. The transmit direction and receive direction of the base station 102 may be the same or different. The transmit direction and receive direction of the UE 104 may be the same or different.

[0092] The base station 102 may include and / or be referred to as a gNB, a Node B, an eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit receive point (TRP), a network node, a network entity, a network equipment, or some other suitable term. The base station 102 may be implemented as an integrated access and backhaul (IAB) node, a relay node, a sidelink node, a clustered (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 clustered base stations may be referred to as a next generation (NG) RAN (NG-RAN).

[0093] 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 handling, 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 position determination entity (PDE), the serving mobile location center (SMLC), the mobile positioning center (MPC), etc. The GMLC 165 and the LMF 166 support UE location services. The GMLC 165 provides an interface for clients / applications (e.g., emergency services) to access UE positioning information. The LMF 166 receives measurements and assistance information from the NG-RAN and the UE 104 via the AMF 161 to calculate the location of the UE 104. The NG-RAN may determine the location of the UE 104 using one or more positioning methods. Positioning the UE 104 may involve signal measurements, position estimation, and optional speed calculations based on these measurements. Signal measurements may be performed by the UE 104 and / or a serving base station (e.g., base station 102). The measured signals may be based on a satellite positioning system (SPS) 170 (e.g., one or more of a global navigation satellite system (GNSS), a global positioning system (GPS), a non-terrestrial network (NTN), or other satellite positioning / positioning systems), LTE signals, wireless local area network (WLAN) signals, Bluetooth signals, a terrestrial beacon system (TBS), sensor-based information (e.g., an atmospheric pressure sensor, a motion sensor), an NR enhanced cell ID (NR E-CID) method, NR signals (e.g., multi-round trip time (multi-RTT), DL angle of departure (DL-AoD), DL time difference of arrival (DL-TDOA), UL time difference of arrival (UL-TDOA), and UL angle of arrival (UL-AoA) positioning), and / or one or more of other systems / signals / sensors.

[0094] Examples of UE include cellular phones, smart phones, session initiation protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablets, smart devices, wearable devices, vehicles, electric meters, gas pumps, large or small kitchen appliances, healthcare equipment, implants, sensors / actuators, displays, or any other similarly functional devices. Some of the UEs may be referred to as IoT devices (e.g., parking meters, gas pumps, toasters, vehicles, heart monitors, etc.). UE 104 may also be referred to as stations, mobile stations, subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, mobile phones, user agents, mobile clients, clients, or some other suitable terminology. In some scenarios, the term UE may also be applied to one or more supporting devices, such as in a device constellation arrangement. One or more of these devices may access a network together and / or individually.

[0095] Reference again Figure 1 In some aspects, a device such as UE 104 communicating with a base station may be configured to manage one or more aspects of wireless communication by facilitating precoding for 8Tx. For example, UE 104 may include a codebook processing component 198 configured to: receive control signaling for uplink MIMO transmission, the control signaling including a first TPMI field and a second TPMI field and an SRS resource set indicator; and send an uplink MIMO transmission precoded with an 8-port uplink MIMO precoder, the 8-port uplink MIMO precoder based on a 4-port uplink MIMO codebook with a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator. In some aspects, the codebook processing component 198 may be configured to: receive control signaling for UL MIMO transmission; and send a UL MIMO transmission precoded with an 8-port uplink MIMO precoder based on the control signaling and a set of two or more antenna port groups.

[0096] In another configuration, the base station 102 may include a codebook signaling component 199 configured to: output control signaling for uplink MIMO transmission for transmission, the control signaling including a first TPMI field and a second TPMI field and an SRS resource set indicator; and receive an uplink MIMO transmission pre-coded with an 8-port uplink MIMO pre-decoder, the 8-port uplink MIMO pre-decoder being based on a 4-port uplink MIMO codebook having a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator. In some aspects, the codebook signaling component 199 may be configured to: output control signaling for UL MIMO transmission for transmission; and obtain the UL MIMO transmission pre-coded with the 8-port uplink MIMO pre-decoder based on the control signaling and a set of two or more antenna port groups.

[0097] Although the following description provides examples for 5G NR (and specifically, for 8Tx transmissions), the concepts described herein may be applicable to other similar areas where the UE may transmit 8Tx transmissions (such as, LTE, LTE-A, CDMA, GSM, and / or other wireless technologies).

[0098] Figure 2A FIG200 is a diagram illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B FIG230 is a diagram illustrating an example of DL channels within a 5G NR subframe. Figure 2C 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), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to either DL or UL, or may be time division duplex (TDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to both DL and UL. Figure 2A , Figure 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 full DL and full UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. The UE is configured with the slot format through the received slot format indicator (SFI) (dynamically configured through DL control information (DCI) or semi-statically / statically configured through radio resource control (RRC) signaling). Note that the following description also applies to the 5G NR frame structure as TDD.

[0099] 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 equal 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 normal or extended. For a normal CP, each time slot may include 14 symbols, and for an extended CP, each time slot may include 12 symbols. The symbol on the DL may be a CP orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbol. The symbol on the UL may be a CP-OFDM symbol (for high throughput scenarios) or a discrete Fourier transform (DFT) extended OFDM (DFT-s-OFDM) symbol (also known as a single carrier frequency division multiple access (SC-FDMA) symbol) (for power-limited scenarios; limited to single-stream transmission). The number of slots within a subframe is based on the CP and the parameter set. The parameter set defines the subcarrier spacing (SCS) and effectively defines the symbol length / duration, which is equal to 1 / SCS.

[0100]

[0101] 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. Thus, for normal CP and parameter set μ, there are 14 symbols / slot and 2 μ timeslots / subframe. The subcarrier spacing can be equal to 2 μ*15kHz, where μ is parameter set 0 to 4. Therefore, the subcarrier spacing for parameter set μ=0 is 15kHz, and the subcarrier spacing for parameter set μ=4 is 240kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIG. 2A to FIG. 2D An example is provided for a normal CP with 14 symbols per slot and a parameter set μ=2 with 4 slots per subframe. 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).

[0102] A resource grid may be used to represent the frame structure. Each slot includes a resource block (RB) (also called a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a number of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0103] like Figure 2A As illustrated, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include a demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0104] 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 particular subframe of a frame. The PSS is used by UE 104 to determine subframe / symbol timing and physical layer identification. A secondary synchronization signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and the radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as an SS block (SSB)). The MIB provides the 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 not sent via the PBCH (such as a system information block (SIB)), and paging messages.

[0105] 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 teeth of the comb. The SRS may be used by the base station for channel quality estimation to achieve frequency-dependent scheduling of the UL.

[0106] 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 be used to carry, among other things, a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0107] 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.

[0108] In the DL, Internet Protocol (IP) packets may be provided to the controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with 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 functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0109] The TX processor 316 and the RX processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) coding / decoding of the transport channel, interleaving, rate matching, mapping onto the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-order phase shift keying (M-PSK), M-order quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be separated into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., a pilot) in the time and / or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially pre-coded to generate multiple spatial streams. Channel estimates from channel estimator 374 may be used to determine coding and modulation schemes and for spatial processing. Channel estimates may be derived 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 for transmission using a corresponding spatial stream.

[0110] At the UE 350, each receiver 354Rx receives a signal through its corresponding antenna in the antenna 352. Each receiver 354Rx recovers the information modulated onto the RF carrier and provides the information to the RX processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial stream destined for the UE 350. In the case where multiple spatial streams are destined for the UE 350, two or more of the multiple spatial streams can be combined into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbol on each subcarrier and the reference signal are recovered and demodulated by determining the signal constellation point most likely to be sent by the base station 310. These soft decisions can be based on the channel estimate calculated by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally sent on the physical channel by the base station 310. The data and control signals are then provided to the controller / processor 359, which implements layer 3 and layer 2 functionality.

[0111] 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.

[0112] Similar to the functionality described in conjunction with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functionality associated with delivery of upper layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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 codebook processing component 198 combines various aspects.

[0117] 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 codebook signaling component 199 combines various aspects.

[0118] Figure 4 4 illustrates an example UE 400 communicating with a network node 450 as presented herein. The UE 400 may be similar to Figure 4 UE 104 and / or Figure 3 The network node 450 may be similar to the base station 102 or a component of the base station 102, such as Figure 1 CU 110, DU 130 and / or RU 140 of the present invention.

[0119] Example UE 400 includes eight antenna elements (e.g., first antenna element 402a, second antenna element 402b, third antenna element 402c, fourth antenna element 402d, fifth antenna element 402e, sixth antenna element 402f, seventh antenna element 402g, and eighth antenna element 402h). Antenna elements may be collectively referred to herein as "antenna elements 402". Antenna elements may be referred to as antennas, antenna ports, or ports. Although example UE 400 is illustrated as having eight antenna elements, in other examples, the UE may include fewer antenna elements or more antenna elements.

[0120] exist Figure 4 In the illustrated example, antenna elements 402 are located on different parts of UE 400 to form diversity and provide directional communication. UE 400 can use at least one of antenna elements 402 to transmit a communication signal (e.g., an SRS signal) to enable network node 450 to estimate an uplink channel. UE 400 includes a baseband 404 and a transmit path 406 for uplink transmission using one or more of antenna elements 402. Various aspects of baseband 404 can be provided by Figure 3350 of the UE 350 is implemented. The transmission path 406 includes eight example transmission chains (e.g., a first transmission chain 408a, a second transmission chain 408b, a third transmission chain 408c, a fourth transmission chain 408d, a fifth transmission chain 408e, a sixth transmission chain 408f, a seventh transmission chain 408g, and an eighth transmission chain 408h). The transmission chain may also be referred to as an RF chain. The transmission chains of the UE 400 may be collectively referred to as "transmission chains 408" herein. Although the example UE 400 is illustrated as having eight transmission chains, in other examples, the UE may include fewer transmission chains or more transmission chains. Each transmission chain may be configured to convert a baseband signal into an RF signal for transmission.

[0121] UE 400 can detect the port by transmitting SRS using a combination of transmission chains. Figure 4 In the example of UE 400, eight example ports (eg, first port 410a, second port 410b, third port 410c, fourth port 410d, fifth port 410e, sixth port 410f, seventh port 410g, and eighth port 410h) may be collectively referred to herein as "ports 410".

[0122] Ports 410 may or may not have a one-to-one mapping to antenna elements 402. When there is a one-to-one mapping, each of antenna elements 402 may be mapped to one of ports 410. UE 400 may report the synthesis of signals from transmit chain 408 to network node 450 as a virtual port by applying TPMI pre-decoder 412. Although TPMI pre-decoder 412 is illustrated with respect to transmit chain 408, TPMI pre-decoder 412 may be applied to baseband 404.

[0123] The UE 400 may support three levels of coherence: full coherence, partial coherence, and incoherence. A UE with full coherence may be referred to as a fully coherent UE and may transmit coherently on all antenna elements 402. A fully coherent UE has the ability to control the relative phase between the transmit chains 408 of the UE 400. The two antenna elements maintain relative phase in the case where the phase across the two antennas is locked and / or remains the same across the uplink transmission.

[0124] A UE with partial coherence may be referred to as a partially coherent UE and may transmit coherently on antenna element pairs. A partially coherent UE has the ability to maintain relative phases across multiple subsets of antenna elements 402. For example, a first coherent antenna pair 414 may include a first antenna element 402a and a fourth antenna element 402d, and a second coherent antenna pair 416 may include a second antenna element 402b and a third antenna element 402c. The antenna elements of the respective coherent antenna pairs may be coherent antennas relative to each other and may maintain relative phases across two respective antenna elements. However, a partially coherent UE may not be able to maintain phase coherence across the two pairs.

[0125] A UE with non-coherence may be referred to as a non-coherent UE and may not be able to transmit coherently on any pair or set of antenna elements. For example, a non-coherent UE may lack the ability to maintain relative phase across any antenna element 402.

[0126] exist Figure 4 In the example of , UE 400 may support multi-layer uplink transmission. For non-coherent UEs, each layer of multi-layer uplink transmission is transmitted to a single antenna element in antenna element 402, and there is no combination across layers. For partially coherent UEs, certain antenna elements are combined and each layer is transmitted to multiple ports. The partially coherent UE may be configured as a partially coherent 2Tx (PC-2) UE or a partially coherent 4Tx (PC-4) UE. For PC-2UE, each layer of uplink transmission is transmitted to two antenna elements in antenna element 402, and for PC-4UE, each layer of uplink transmission is transmitted to four antenna elements in antenna element 402. For fully coherent UEs, each layer is transmitted to each antenna element in antenna element 402.

[0127] The UE 400 may be configured to apply a pre-decoder across all sub-bands transmitted in the uplink, or may be configured to apply multiple pre-decoders for multiple sub-bands transmitted in the uplink. The network node 450 may configure the UE 400 to have one or more pre-decoder configurations. Additionally or alternatively, the network node 450 may activate the pre-decoder configuration at the UE 400. The UE 400 may receive the pre-decoder configuration via RRC signaling, downlink control information (DCI), and / or MAC-control element (MAC-CE).

[0128] Figure 5 An example communication flow 500 between a network node 502 and a UE 504 as presented herein is illustrated. Aspects of the network node 502 may be Figure 1 Base station 102, Figure 3 Base station 310 and / or Figure 4One or more aspects described for the network node 502 may be performed by a base station or a component of a network entity (eg, a CU, a DU, and / or a RU). Various aspects of the UE 504 may be performed by Figure 1 UE 104, Figure 3 UE 350 and / or Figure 4 UE 400. Figure 5 Not shown in the illustrated example, it will be appreciated that in additional or alternative examples, the network node 502 may communicate with one or more other network nodes or UEs, and / or the UE 504 may communicate with one or more other network nodes or UEs.

[0129] In the illustrated example, the communication flow 500 facilitates codebooks and control signaling for 8Tx uplink MIMO transmissions at the UE 504. The communication flow 500 may utilize an 8Tx codebook design for ranks 5 to 8. The control signaling may facilitate signaling a transmit precoding matrix index (TPMI) field and rank information. The control signaling may indicate an 8Tx precoding matrix for ranks 1 to 8. The example communication flow 500 may also facilitate dynamic switching between non-coherent precoding, partially coherent precoding, and fully coherent precoding. In some examples, the control signaling may reuse a 4Tx codebook and a TPMI field for an 8Tx codebook.

[0130] like Figure 5 As shown, the network node 502 may output an RRC configuration 510 that is received by the UE 504. The network node 502 may output the RRC configuration 510 via RRC signaling. The RRC configuration 510 may configure the UE 504 with one or more parameters associated with transmitting an uplink transmission. For example, the RRC configuration 510 may identify one or more sounding reference signal (SRS) resources.

[0131] UE 504 may transmit SRS 520 that is received by network node 502. SRS 520 may be associated with one or more transmit ports of UE 504, such as Figure 4 Although the example UE 504 transmits SRS, in other examples, the UE 504 may transmit any other reference signal that may enable the network node to estimate the channel conditions between the UE 504 and the network node 502.

[0132] exist Figure 5 In the example of , the network node 502 uses the SRS 520 to generate an uplink channel estimate 530. The network node 502 may then select a precoding matrix 532 based on the uplink channel estimate 530. The network node 502 may also select a transmit precoding matrix index 534 (TPMI) from the Tx codebook based on the precoding matrix 532.

[0133] like Figure 5 As shown, the network node 502 sends control signaling 540 that is received by the UE 504. The network node 502 may send the control signaling 540 via a DCI. The UE 504 determines a precoding matrix 550 based on the control signaling 540. The UE 504 may then use the precoding matrix 550 to send an uplink transmission 560.

[0134] For multi-TRP (M-TRP) PUSCH repetition, the UE 504 may be configured with two SRS resource sets. The UE 504 may also be configured with one or more SRS resource capability sets. It may not be desirable for the UE 504 to be configured with different numbers of SRS resources in the two SRS resource sets. Additionally, when two SRIs are indicated, the "nrofSRS-Ports" parameter for the two indicated SRS resources may be the same.

[0135] exist Figure 5 In the example of , the control signaling 540 includes an SRS resource set indicator 590, a first SRS resource indicator (e.g., a first SRI field 592), a first TPMI field 594, a second SRI field 596, and a second TPMI field 598. The SRS resource set indicator 590 may be a 2-bit field and indicates how the SRI field and the TPMI field are associated with the corresponding SRS resource set. Figure 6 A table 600 illustrating an example mapping of the SRS resource set indicator 590 to the SRI field and the TPMI field is depicted. Based on the bit fields mapped to the index, the SRI field and the TPMI field may be used for M-TRP PUSCH repetition.

[0136] The first TPMI field 594 may have a size of 6 bits and indicate a rank and a precoding matrix indication. The first TPMI field 594 may indicate a rank and a precoding matrix for a first repetition set. The second TPMI field 598 may have a size of 5 bits and indicate a precoding matrix indication for a second repetition set. The second TPMI field 598 may not indicate a rank. Instead, the rank indicated from the first TPMI field 594 may be used for the second repetition set. As used herein, the term "rank" may also be used to refer to a "layer".

[0137] Figure 7 A table 700 is depicted that maps the value of the first TPMI field 594 to the rank and precoding matrix for the first repetition set to facilitate uplink 4Tx MIMO. Figure 7 In the example above, the maximum rank is 2, 3, or 4.

[0138] Figure 8A table 800 is depicted that maps the value of the second TPMI field 598 to a precoding matrix for a second repetition set to facilitate uplink 4Tx MIMO. Figure 8 In the example above, the maximum rank is 2, 3, or 4.

[0139] exist Figure 7 and Figure 8 In the example of , the first column provides a bitfield index mapped to the rank information and matrix. The bitfield index can be mapped to the second column, the third column, or the fourth column based on whether the codebook subset indicator (which can be referred to as "codebookSubset" or by any other name) indicates support for fully coherent, partially coherent, and incoherent codebooks (e.g., the bitfield index is mapped to the second column), indicates support for partially coherent and incoherent codebooks (e.g., the bitfield index is mapped to the third column), or indicates support for incoherent codebooks (e.g., the bitfield index is mapped to the third column). Figure 7 As shown, the bit field index column is divided into three parts. The first part 702 corresponds to the non-coherent matrix in the corresponding codebook, the second part 704 corresponds to the partially coherent matrix in the corresponding codebook, and the third part 706 corresponds to the fully coherent matrix in the corresponding codebook.

[0140] For example, the bitfield index "4" in the table of slide 6 maps to "layer 1" and the fourth matrix in the corresponding rank 1 codebook. In addition, the indicated matrix is ​​a non-coherent matrix.

[0141] Figures 9 to 12 is a table of codebook subsets that can be used in different scenarios and indicates the scaling factor used for power transmission. The predecoder and the scaling factor depend on, for example, the number of layers in the uplink transmission, the number of antenna ports of the UE, and whether transform precoding is enabled or disabled. The table includes a "TPMI index" column and a predecoder matrix "W" column. The TPMI index may refer to or indicate a matrix W, which may represent a predecoder and is sorted from left to right in ascending order of the TPMI index. As used herein, the term "matrix" may be used interchangeably with the term "predecoder".

[0142] In addition, about Fig.13 Example UE 1300 to discuss Figures 9 to 12 To better understand some aspects disclosed herein. Aspects of UE 1300 may be similar to Figure 4 UE 400. However, when UE 400 is configured with eight antenna elements (e.g., antenna element 402), UE 1300 is configured with four antenna elements (e.g., first antenna element 1302a, second antenna element 1302b, third antenna element 1302c, and fourth antenna element 1302d). The four antenna elements of UE 1300 may be collectively referred to herein as “antenna element 1302”. Figure 4 In the example of , UE 1300 includes a baseband 1304 and a transmit path 1306. Fig.13 1304. Transmit path 1306 of baseband 1304 includes a transmit chain 1308 connected to port 1310. Port 1310 can be mapped one-to-one with antenna port 1302. Transmit path 1306 also includes a TPMI predecoder 1312. Aspects of baseband 1304 can be similar to baseband 404. Aspects of transmit path 1306 can be similar to transmit path 406. Aspects of chain 1308 can be similar to transmit chain 408. Aspects of port 1310 can be similar to port 410. Aspects of TPMI predecoder 1312 can be similar to TPMI predecoder 412.

[0143] In the matrix W, the first row corresponds to the first antenna port of the UE 1300 (e.g., the first antenna element 1302a), the second row corresponds to the second antenna port of the UE 1300 (e.g., the second antenna element 1302b), the third row corresponds to the third antenna port of the UE 1300 (e.g., the third antenna element 1302c), and the fourth row corresponds to the fourth antenna port of the UE 1300 (e.g., the fourth antenna element 1302d). In addition, the number of columns in the matrix W corresponds to the number of layers. For example, a precoding matrix with a single column corresponds to a single-layer transmission, a precoding matrix with two columns corresponds to a two-layer transmission, a precoding matrix with three columns corresponds to a three-layer transmission, and a precoding matrix with four columns corresponds to a four-layer transmission, wherein the first column corresponds to the first layer, the second column corresponds to the second layer, the third column corresponds to the third layer, and the fourth column corresponds to the fourth layer. In addition, a first value in the matrix (e.g., "0") may indicate that the antenna element corresponding to the first value is not used for UL transmission. A second value in the matrix (e.g., "1") may indicate that the antenna element corresponding to the second value is used for UL transmission.

[0144] The network node may select a precoding configuration based on channel conditions of a link between the UE and the network node. The network node may additionally or alternatively select a precoding configuration based on the capabilities of the UE. For example, the precoding configuration may be based on whether the UE is a fully coherent UE, a partially coherent UE, or a non-coherent UE.

[0145] Fig. 9 Depicted is a table 900 storing a codebook subset of a precoding matrix W for a single layer transmission (e.g., "rank 1") for a UE with four antenna ports (e.g., "4Tx") as presented herein. Table 1900 may be used by a network node and / or a UE to adopt Figure 5 Communication flow 500. Fig. 9In the example of , a scaling factor of "1 / 2" for power transmission is applied to the pre-decoder of table 900. Table 900 includes a set of non-phase pre-decoders 902, which includes the first four matrices of the codebook and are indicated by TPMI indexes 0 to 3, respectively. Table 900 also includes a first set of partially phase-phase pre-decoders 904, which includes the next four matrices of the codebook and are indicated by TPMI indexes 4 to 7, respectively. Table 900 also includes a second set of partially phase-phase pre-decoders 906, which includes the next four matrices of the codebook and are indicated by TPMI indexes 8 to 11, respectively. In addition, table 900 includes a set of fully phase-phase pre-decoders 908, which includes the remaining sixteen matrices and is indicated by TPMI indexes 12 to 27.

[0146] Reference again Figure 7 , the bit field index "4" maps to "layer 1" and the corresponding fourth matrix in the rank 1 codebook. Therefore, the bit field index "4" in slide 6 maps to Fig. 9 Matrix 910.

[0147] Fig.10 Depicted is a table 1000 storing a codebook subset of a precoding matrix W for two-layer transmission for a UE with four antenna ports as presented herein. Table 1000 may be used by a network node and / or a UE to adopt Figure 5 Communication flow 500. In table 1000, the number of transmit ports is four (eg, "4Tx"), and the number of layers of the PUSCH is two (eg, "Rank 2").

[0148] Table 1000 includes a set of non-phased precoders 1002, which includes the first six matrices of the codebook and are respectively indicated by TPMI indices 0 to 5. Table 1000 also includes a set of partially phased precoders 1004, which includes the next eight matrices of the codebook and are respectively indicated by TPMI indices 6 to 13. In addition, table 1000 includes a set of fully phased precoders 1006, which includes the remaining eight matrices and are indicated by TPMI indices 14 to 21.

[0149] exist Fig.10 In the example of FIG. 1 , for the pre-decoders of the non-coherent pre-decoder set 1002 and the pre-decoders of the partially coherent pre-decoder set 1204, the scaling factor for power transmission is “1 / 2”. The scaling factor power transmission is

[0150]

[0151] For the pre-decoder of the full phase intervention decoder set 1006.

[0152] Fig.11 A table 1100 is depicted storing a codebook subset of a precoding matrix W for three-layer transmission for a UE with four antenna ports as presented herein. Table 1100 may be used by a network node and / or a UE to adopt Figure 5 Communication flow 500. In table 1100, the number of transmission ports is four (eg, "4Tx"), and the number of layers of the PUSCH is three (eg, "Rank 3").

[0153] Table 1100 includes a set of non-phased precoders 1102, which includes one matrix of the codebook and is indicated by TPMI index 0. Table 100 also includes a set of partially phased precoders 1104, which includes the next two matrices of the codebook and is indicated by TPMI indexes 1 to 2, respectively. In addition, table 100 includes a set of fully phased precoders 106, which includes the remaining four matrices and is indicated by TPMI indexes 3 to 6.

[0154] exist Figure 1 In the example of FIG. 1 , for the pre-decoders of the non-coherent pre-decoder set 1102 and the pre-decoders of the partially coherent pre-decoder set 1104, the scaling factor for power transmission is “1 / 2”. The scaling factor power transmission is

[0155]

[0156] For the pre-decoder of the full phase intervention decoder set 106.

[0157] Fig.12 A table 1200 is depicted storing a codebook subset of a precoding matrix W for four-layer transmission for a UE with four antenna ports as presented herein. Table 1200 may be used by a network node and / or a UE to adopt Figure 5 Communication flow 500. In table 1200, the number of transmission ports is four (eg, "4Tx"), and the number of layers of the PUSCH is four (eg, "Rank 4").

[0158] Table 1200 includes a non-phased precoder set 1202, which includes one matrix of the codebook and is indicated by TPMI index 0. Table 1200 also includes a partially phased precoder set 1204, which includes the next two matrices of the codebook and is indicated by TPMI indexes 1 to 2, respectively. In addition, table 1200 includes a fully phased precoder set 1206, which includes the remaining two matrices and is indicated by TPMI indexes 3 to 4.

[0159] exist Fig.12In the example of FIG. 1 , for the pre-decoders of the non-coherent pre-decoder set 1202, the scaling factor for power transmission is “1 / 2”. The scaling factor power transmission is

[0160]

[0161] For the pre-decoders of the partially phase-interleaved set 1204. For the pre-decoders of the fully phase-interleaved set 1206, the scaling factor power transmission is "1 / 4".

[0162] As wireless communication technology evolves, additional types of UEs may be supported, generally referred to herein as "advanced UEs." Advanced UEs may include smartphones, indoor customer premises equipment (CPE), outdoor CPE, laptop computers, etc. Advanced UEs may be associated with higher reliability and / or improved efficiency compared to non-advanced UEs. Advanced UEs may include more than four antennas, such as Figure 4 The advanced UE may also or alternatively have more relevant power constraints. In addition, the advanced UE may support more than four downlink layers and / or four uplink transmit ports. The advanced UE may also support new DMRS, SRS and / or codebook designs.

[0163] Since consideration is being given to increasing the number of transmit antennas (Tx) (e.g., more than four transmit antennas) for advanced UEs (e.g., mobile devices, larger size devices, etc.) utilizing 5G technology, supporting 8-port uplink transmission may be beneficial for improving 5G performance.

[0164] For 8-port uplink transmission, a new codebook for precoding and related precoding scheduling information in DCI can be used. The first type of codebook can support uplink transmission with disabled precoding. This codebook can use a new design for 8 ports. In addition, the new design can be used for ranks 5 to 8 (e.g., five-layer, six-layer, seven-layer, or eight-layer uplink transmission). The second type of codebook type can support uplink transmission with enabled precoding. This codebook can use a new design for 8 ports.

[0165] Therefore, it can be understood that 8Tx uplink MIMO can adopt 8Tx uplink operation to support four or more layers per UE in uplink transmission. To achieve 8Tx uplink operation, uplink DMRS, SRS, SRS resource indicator (SRI) and / or TPMI (including codebook) can be updated.

[0166] Aspects disclosed herein facilitate 8Tx uplink MIMO. Example techniques include: reusing a 4Tx codebook and / or TPMI table; generating a new 8Tx codebook; and controlling signaling to indicate to the UE a precoder to use when employing 8Tx uplink MIMO.

[0167] It can be understood that there are two PUSCH repetition sets. The first repetition set will use Figure 7 Table 700, and the second set of repetitions will use Figure 8 Table 800. These tables support 4Tx. However, aspects disclosed herein facilitate supporting 8Tx MIMO.

[0168] In a first example, various aspects disclosed herein reuse 4Tx codebooks (eg, Figures 9 to 12 Example codebook subset of ) and TPMI table for 8Tx (e.g., Figure 7 and Figure 8 TPMI table). Figure 4 As described in the UE 400 of FIG. 4 , the pre-decoder for the 8Tx UE may include a non-coherent (NC) codebook, a partially coherent codebook (PC-2) for two ports, and a partially coherent codebook (PC-4) for four ports. When mapping the coherence from the 4Tx codebook to the 8Tx codebook, the 4Tx NC codebook is mapped to the 8Tx NC codebook, the 4T PC codebook is mapped to the 8Tx PC-2 codebook, and the 4Tx fully coherent codebook is mapped to the 8Tx PC-4 codebook.

[0169] Fig.14 Depicted is a table 1400 including example 8Tx precoding matrix types for ranks 1 to 8 as presented herein. Fig.14 In the example, the 8Tx precoding matrix type is based on reuse combined Figures 9 to 12 For example, the rank 1 precoding matrix 1402 may reuse the rank 1 4Tx precoding matrix. Fig.14 As shown, the 4Tx rank 1 pre-coding matrix (“W 4Tx,r＝1 ”) may be associated with the first four antenna elements of an 8Tx UE (e.g., “Type 1”) or the last four antenna elements of an 8Tx UE (e.g., “Type 2”).

[0170] like Fig.14 As shown, the rank 2 precoding matrix 1404 can be configured into three different types. Similar to the example of the rank 1 precoding matrix 1402, the rank 2 precoding matrix 1404 includes two types, wherein the corresponding 4Tx matrix (e.g., “W 4Tx,r＝2 ”) is associated with the first four antenna elements of the 8Tx UE (e.g., “Type 1”) or the last four antenna elements of the 8Tx UE (e.g., “Type 2”). The rank 2 precoding matrix 1404 also includes a third type (e.g., “Type 3”) in which the first layer uses the first 4Tx rank 1 precoding matrix (“W 4Tx,r＝1”), and the second layer uses the second 4Tx rank 1 precoding matrix (“W′ 4Tx,r＝1 ”).

[0171] Similar to the examples of rank 1 precoding matrix 1402 and rank 2 precoding matrix 1404, rank 3 precoding matrix 1406 and rank 4 precoding matrix 1408 each include a type in which the corresponding 4Tx precoding matrix is ​​used in the first four antenna elements of an 8Tx UE (e.g., "Type 1") or the last four antenna elements of an 8Tx UE (e.g., "Type 2").

[0172] It can be appreciated that the rank 3 precoding matrix includes three layers. The example rank 3 precoding matrix 1406 includes two additional types of using a 4Tx precoding matrix with a lower rank for different layers. For example, the rank 3 precoding matrix 1406 of "type 3" can be a 4Tx rank 2 precoding matrix ("W 4Tx,r＝2 ”) is used for the first four antenna elements of the 8Tx UE in the first and second layers, and the 4Tx rank 1 precoding matrix (“W 4Tx,r＝1 ”) is used for the last four antenna elements of the 8Tx UE in the third layer. The rank 3 precoding matrix 1406 of “type 4” can convert the 4Tx rank 1 precoding matrix (“W 4Tx,r＝1 ”) is used for the first four antenna elements of the 8Tx UE in the first layer, and the 4Tx rank 2 precoding matrix (“W 4Tx,r＝2 ”) for the last four antenna elements of the 8Tx UE at the second and third layers.

[0173] like Fig.14 As shown, the rank 4 precoding matrix 1408 includes five different types, wherein the different types utilize different combinations of 4Tx precoding matrix ranks with different layers. The rank 5 precoding matrix 1410 includes four different types, wherein the different types utilize different combinations of 4Tx precoding matrix ranks with different layers. The rank 6 precoding matrix 1412 includes three different types, wherein the different types utilize different combinations of 4Tx precoding matrix ranks with different layers. The rank 7 precoding matrix 1414 includes two different types, wherein the different types utilize different combinations of 4Tx precoding matrix ranks with different layers. The rank 8 precoding matrix 1416 includes one type, wherein the first 4Tx rank 4 precoding matrix (“W 4Tx,r＝4 ”) for the first four antenna elements of the 8Tx UE for the first four layers, and the second 4Tx rank 4 precoding matrix (“W′ 4Tx,r＝4 ”) is used in the last four antenna elements of the 8Tx UE in the last four layers.

[0174] As above combined Figure 5As depicted, control signaling 540 to UE 504 may include SRS resource set indicator 590, first SRI field 592, first TPMI field 594, second SRI field 596, and second TPMI field 598. Aspects disclosed herein use information provided via control signaling 540 to indicate the rank and type of the 8Tx precoding matrix.

[0175] Fig.15 1500 between a network node 1502 and a UE 1504 as presented herein. Aspects of the communication flow 1500 may be similar to Figure 5 Communication flow 500.

[0176] like Fig.15 As shown, network node 1502 outputs an RRC configuration 1510 that is received by UE 1504. Aspects of RRC configuration 1510 may be similar to Figure 5 RRC configuration 510. Fig.15 In the example of , RRC configuration 1510 includes a first SRS resource set 1512, a first SRS resource set port indicator 1514, a second SRS resource set 1516, a second SRS resource set port indicator 1518, and an 8-port uplink MIMO indicator 1520. The first SRS resource set 1512 and the second SRS resource set 1516 may indicate two SRS resource sets allocated to UE 1504. Each SRS resource set may be associated with four ports. Fig.15 In the example of , the first SRS resource set port indicator 1514 may indicate four ports associated with the first SRS resource set, and the second SRS resource set port indicator 1518 may indicate four ports associated with the second SRS resource set. The 8-port uplink MIMO indicator 1520 may configure the UE 1504 to use the indicated SRS resource set for 8Tx uplink transmission.

[0177] The UE 1504 may use the information provided by the RRC configuration 1510 to determine which two SRS resource sets are associated with 8-port UL MIMO (eg, based on the first SRS resource set 1512 and the second SRS resource set 1516).

[0178] The network node 1502 may output control signaling 1530 received by the UE 1504. The network node 1502 may output control signaling 1530 after receiving the SRS from the UE 1504, such as in conjunction with Figure 5 The example SRS 520 described above. Aspects of the control signaling 1530 may be similar to Figure 4 The network node 1502 may provide the control signaling 1530 as DCI. Fig.15In the example of , the control signaling 1530 includes an SRS resource set indicator 1532 , a first SRI field 1534 , a second SRI field 1536 , a first TPMI field 1538 , and a second TPMI field 1540 .

[0179] The control signaling 1530 may include a precoding matrix type indicator and a precoding matrix indicator. For example, at 1550, the UE 1504 may use the SRS resource set indicator 1532 to determine the precoding matrix type (e.g., type 1, type 2, etc.). The SRS resource set indicator 1532 may be a 2-bit field. At 1552, the UE 1504 may use two SRI fields (e.g., a first SRI field 1534 and a second SRI field 1536) to determine the corresponding SRS resources within the two SRS resource sets indicated by the RRC configuration 1510 (e.g., via the first SRS resource set 1512 and the second SRS resource set 1516). At 1554, the UE 1504 may use the first TPMI field 1538 to determine the rank and the first TPMI ("TPMI 1"), as combined with Figure 8 At 1556, UE 1504 may determine a second TPMI ("TPMI 2") using second TPMI field 1540. Based on the information provided by RRC configuration 1510 and control signaling 1530, UE 1504 may determine the 8Tx precoding matrix. Fig.15 As shown, UE 1504 may send an uplink transmission 1560 that is received by network node 1502. Fig.15 In the example of , the SRS resource set indicator 1532 , the first TPMI field 1538 , and the second TPMI field 1540 jointly specify the 8Tx precoding matrix for uplink transmission 1560 .

[0180] exist Figure 5 and Fig. 9 In the example of , the precoding matrix indicated by the second TPMI field 598 of the control signaling 540 has the same rank as the precoding matrix indicated by the first TPMI field 594. Fig.15 In the example of , the rank of the second precoding matrix indicated by the second TPMI field 1540 is determined based on the type indicator and the rank indicated by the first TPMI field 1538 .

[0181] Fig.16 An example table 1600 is depicted that facilitates mapping type indicators and TPMI fields to an 8Tx precoding matrix as presented herein. The example table 1600 includes a type indicator column 1602, a first TPMI field column 1604, a second TPMI field column 1606, and an 8Tx precoding matrix column 1608. The value of the type indicator column 1602 may correspond to Fig.15 In the SRS resource set indicator 1532, the value of the first TPMI field column 1604 may correspond to the first TPMI field 1538 of the figure, and the value of the second TPMI field column 1606 may correspond to the second TPMI field 1540 of the figure. Fig.16 In the example of , the "TPMI 1" indication included in the first TPMI field column 1604 and / or the second TPMI field column 1606 corresponds to the precoding matrix indication for the first SRS resource set. In addition, the "TPMI 2" indication included in the first TPMI field column 1604 and / or the second TPMI field column 1606 corresponds to the precoding matrix indication for the second SRS resource set.

[0182] exist Fig.16 In the example of Fig.16 For example, the SRS resource set indicator 1532 may be a 2-bit field, and thus, the value of the SRS resource set indicator 1532 may correspond to a value of 0, 1, 2, or 3. Fig.16 As shown in the example of , when the type indicator of the type indicator column 1602 is "0" or "1", the value of the second TPMI field column 1606 can be "reserved" or ignored when determining the 8Tx precoding matrix. Fig.14 In the example table 1400, the rank 1 precoding matrix 1402, the rank 2 precoding matrix 1404, the rank 3 precoding matrix 1406, and the rank 4 precoding matrix 1408 include types 1 and 2 that reference a corresponding 4Tx precoding matrix. When the value of the type indicator column 1602 is "0", the 8Tx precoding matrix has "type 1", and when the value of the type indicator column 1602 is "1", the 8Tx precoding matrix has "type 2".

[0183] For example, the first row 1610 of the rank 1, type 1 precoding matrix corresponds to Fig.14 The rank 1 precoding matrix 1402 of the rank 1, type 1 precoding matrix, which refers to the 4Tx rank 1 precoding matrix (“W 4Tx,r＝1 ”). The TPMI value of the first TPMI field 1538 may indicate a 4Tx rank 1 codebook (eg, Fig.11 1100) for which precoding matrix to use for the 4Tx rank 1 precoding matrix (“W 4Tx,r＝1 ”). For example, in the case where the value of the first TPMI field 1538 is “4”, the UE 1504 may use the matrix 1110 of the table 1100 to fill the 4Tx rank 1 precoding matrix (“W 4Tx,r＝1 ”).

[0184] The example second row 1612 of the table 1600 includes a type indicator "2", and the first TPMI indicates "4Tx, 1 layer, TPMI1". Fig.16 In the example of , the type indicator "2" and the rank 1 indication (e.g., "1 layer") via the first TPMI indicate that the rank of the second precoding matrix is ​​also rank 1 (e.g., "1 layer"). The number of layers indicated by the first TPMI and the number of layers indicated by the second TPMI correspond to the rank of the 8Tx precoding matrix.

[0185] like Fig.16 As shown in the example table 1600 of FIG. 1600 , not all pre-coding matrix types are supported. For example, for rank 4, table 1600 supports types 1 to 3, but does not support types 4 and 5. For ranks 5 to 7, the corresponding type 1 is supported, but the remaining types are not supported. Therefore, it can be understood that the reuse Fig.15 The two SRI fields and two TPMI fields of the control signaling 1530 may cause certain types to not be represented.

[0186] Fig.17 1700 between a network node 1702 and a UE 1704 as presented herein. Aspects of the communication flow 1700 may be similar to Figure 5 Communication flow 500 and / or Fig.15 Communication flow 1500.

[0187] Similar to Fig.15 In the example of FIG. 1704 , the network node 1502 outputs an RRC configuration 1710 which is received by the UE 1704. Fig.17 In the example of , RRC configuration 1710 includes a first SRS resource set 1712, a first SRS resource set port indicator 1714, a second SRS resource set 1716, a second SRS resource set port indicator 1718, and an 8-port uplink MIMO indicator 1720. The first SRS resource set 1712 and the second SRS resource set 1716 may indicate two SRS resource sets allocated to UE 1704. Each SRS resource set may be associated with four ports. Fig.17 In the example of , the first SRS resource set port indicator 1714 may indicate four ports associated with the first SRS resource set, and the second SRS resource set port indicator 1718 may indicate four ports associated with the second SRS resource set. The 8-port uplink MIMO indicator 1720 may configure the UE 1704 to use the indicated SRS resource set for 8Tx uplink transmission.

[0188] The UE 1704 may use the information provided by the RRC configuration 1710 to determine which two SRS resource sets are associated with 8-port UL MIMO (eg, based on the first SRS resource set 1712 and the second SRS resource set 1716).

[0189] The network node 1702 may output control signaling 1730 received by the UE 1704. The network node 1702 may output control signaling 1730 after receiving the SRS from the UE 1704, such as in conjunction with Figure 5 The control signaling 1730 may be similar to the example SRS 520 described above. Figure 4 The network node 1702 may provide the control signaling 1730 as DCI. Fig.15 In the example of FIG. 17 , the control signaling 1730 includes an SRS resource set indicator 1732 , a first SRI field 1734 , a second SRI field 1736 , a first TPMI field 1738 , and a second TPMI field 1740 .

[0190] exist Fig.17 , the UE 1704 may use the SRS resource set indicator 1732, the second SRI field 1736, the first TPMI field 1738, and the second TPMI field 1740 to determine the 8Tx precoding matrix to be applied for transmitting the uplink transmission 1760. For example, at 1750, the UE 1704 may use the SRS resource set indicator 1732 and the second SRI field 1736 to determine the precoding matrix type (e.g., type 1, type 2, etc.). At 1752, the UE 1704 may use the first SRI field 1734 to determine the corresponding SRS resources within the two SRS resource sets indicated by the RRC configuration 1710 (e.g., via the first SRS resource set 1712 and the second SRS resource set 1716). For example, when the first SRI field 1734 is set to "0", SRS resource 0 in the first SRS resource set as indicated by the first SRS resource set 1712 and SRS resource 0 in the second SRS resource set as indicated by the second SRS resource set 1716 are the indicated SRS resources. In addition, when the first SRI field 1734 is set to "1", SRS resource 1 in the first SRS resource set as indicated by the first SRS resource set 1712 and SRS resource 1 in the second SRS resource set as indicated by the second SRS resource set 1716 are the indicated SRS resources.

[0191] At 1754, UE 1704 may use first TPMI field 1738 to determine the rank and first TPMI ("TPMI 1"), as combined with Figure 8At 1756, UE 1704 may determine a second TPMI ("TPMI 2") using second TPMI field 1740. Based on the information provided by RRC configuration 1710 and control signaling 1730, UE 1704 may determine the 8Tx precoding matrix. Fig.17 As shown, UE 1704 may send an uplink transmission 1760 that is received by network node 1702. UE 1704 may send uplink transmission 1760 using the determined 8Tx precoding matrix. Fig.17 In the example of , the SRS resource set indicator 1732 , the second SRI field 1736 , the first TPMI field 1538 , and the second TPMI field 1540 jointly specify the 8Tx precoding matrix for uplink transmission 1760 .

[0192] Fig.18 Depicted is a table 1800 that facilitates mapping of the type indicator, modified SR field, and TPMI field to an 8Tx precoding matrix as presented herein. Fig.19 Depicted is a table 1900 that facilitates mapping of the type indicator, modified SR field, and TPMI field to an 8Tx precoding matrix as presented herein. Fig.18 and Fig.19 The tables can be read together and illustrate the support Fig.14 All possible pre-coding matrix types are indicated in the example table 1400 of .

[0193] Example tables 1800 and 1900 include a type indicator column 1802, a second SRI column 1804, a first TPMI field column 1806, a second TPMI field column 1808, and an 8Tx precoding matrix column 1810. The value of the type indicator column 1802 may correspond to Fig.17 The SRS resource set indicator 1732 of the second SRI column 1804 may correspond to the second SRI field 1736 of the figure, the value of the first TPMI field column 1806 may correspond to the first TPMI field 1738 of the figure, and the value of the second TPMI field column 1808 may correspond to the second TPMI field 1740 of the figure. Fig.18 and Fig.19 In the example of , the "TPMI 1" indication included in the first TPMI field column 1806 and / or the second TPMI field column 1808 corresponds to the precoding matrix indication for the first SRS resource set. In addition, the "TPMI 2" indication included in the first TPMI field column 1806 and / or the second TPMI field column 1808 corresponds to the precoding matrix indication for the second SRS resource set.

[0194] exist Fig.18 and Fig.19In the example of FIG. 1804, a second SRI column 1804 is included to determine the precoding matrix type allowing support ratio Fig.16 The precoding matrix types supported by Table 1600 are more precoding matrix types. Similar to the example table 1600, when the value of the type indicator column 1802 is set to "0" or "1", the value of the second TPMI field column 1808 can be ignored to determine the 8Tx precoding matrix. In addition, the value of the second SRI column 1804 can also be ignored to determine the 8Tx precoding matrix. However, when the value of the type indicator column 1802 is set to "2" or "3", the value of the second SRI column 1804 is also used to determine the 8Tx precoding matrix. Fig.18 and Fig.19 In the example, Fig.16 Compared to the 8 Tx pre-coding matrix types supported by Table 1600, including the second SRI column 1804 allows eight additional 8 Tx pre-coding matrix types to be supported. Fig.14 Examples of all pre-coding matrix types in Table 20.

[0195] Fig. 20 2000 between a network node 2002 and a UE 2004 as presented herein. Aspects of the communication flow 2000 may be similar to Figure 5 Communication flow 500, Fig.15 Communication flow 1500 and / or Fig.17 Communication flow 1700.

[0196] Similar to Fig.15 and Fig.17 In the example of , network node 2002 outputs RRC configuration 2010 which is received by UE 2004. Fig. 20 In the example of , RRC configuration 2010 includes a first SRS resource set 2012, a first SRS resource set port indicator 2014, a second SRS resource set 2016, a second SRS resource set port indicator 2018, and an 8-port uplink MIMO indicator 2020. The first SRS resource set 2012 and the second SRS resource set 2016 may indicate two SRS resource sets allocated to the UE 2004. Each SRS resource set may be associated with four ports. The first SRS resource set port indicator 2014 may indicate four ports associated with the first SRS resource set, and the second SRS resource set port indicator 2018 may indicate four ports associated with the second SRS resource set. The 8-port uplink MIMO indicator 2020 may configure the UE 2004 to use the indicated SRS resource set for 8Tx uplink transmission.

[0197] UE 2004 may use information provided by RRC configuration 2010 to determine which two SRS resource sets are associated with 8-port UL MIMO (eg, based on first SRS resource set 2012 and second SRS resource set 2016).

[0198] The network node 2002 may output control signaling 2030 received by the UE 2004. The network node 2002 may output control signaling 2030 after receiving the SRS from the UE 2004, such as in conjunction with Figure 5 The control signaling 2030 may be similar to the example SRS 520 described above. Figure 4 The network node 2002 may provide the control signaling 2030 as DCI. Fig.15 and Fig.17 In the example of FIG. 2040 , the control signaling 2030 includes an SRS resource set indicator 2032 , a first SRI field 2034 , a second SRI field 2036 , a first TPMI field 2038 , and a second TPMI field 2040 .

[0199] exist Fig. 20 In the example of , UE 2004 can use the information provided by RRC configuration 2010 and control signaling 2030 to determine the 8Tx precoding matrix for uplink transmission 2060. Fig.17 For example, communication flow 2000 supports all 8Tx pre-coding matrix types. Fig.15 and Fig.17 In contrast to the example of , the example of 26 includes independently determining the rank and TPMI associated with the corresponding SRS resource set. That is, the UE 2004 can use the first TPMI field 2038 of the control signaling 2030 to determine the rank and the first TPMI ("TPMI 1"). The UE 2004 can also use the second TPMI field 2040 of the control signaling 2030 to determine the rank and the second TPMI ("TPMI 2").

[0200] For example, at 2050, UE 2004 may use SRS resource set indicator 2032 to determine a precoding matrix type (e.g., type 1, type 2, etc.). At 2052, UE 2004 may use two SRI fields (e.g., first SRI field 2034 and second SRI field 2036) of control signaling 2030 to determine corresponding SRS resources within two SRS resource sets indicated by RRC configuration 2010 (e.g., via first SRS resource set 2012 and second SRS resource set 2016). At 2054, UE 2004 may use first TPMI field 2038 of control signaling 2030 to determine a rank and a first TPMI ("TPMI 1"), as combined with Figure 8At 2056, UE 2004 may determine the rank and the second TPMI ("TPMI 2") using the second TPMI field 2040 of control signaling 2030. UE 2004 may determine the rank and the second TPMI similarly to determining the rank and the first TPMI (e.g., as combined with Figure 8 Based on the information provided by RRC configuration 2010 and control signaling 2030, UE 2004 may determine the 8Tx precoding matrix. Fig. 20 As shown, UE 2004 may send an uplink transmission 2060 that is received by network node 2002. Fig. 20 In the example of FIG. 2060 , the SRS resource set indicator 2032, the first TPMI field 2038, and the second TPMI field 2040 jointly specify the 8Tx precoding matrix for the uplink transmission 2060. However, the TPMI fields are used to independently indicate the first TPMI ("TPMI 1") and the second TPMI ("TPMI 2"). In addition, in the case where the second TPMI field 2040 independently indicates the rank of the second TPMI, the size of the second TPMI field 2040 can be 6 bits, similar to the size of the first TPMI field 2038, which is different from the example in which the size of the second TPMI field is 5 bits. Fig.15 and Fig.17 In contrast, the second TPMI field of the example of FIG.

[0201] exist Fig. 20 In the example of , the precoding matrix type is determined based on the SRS resource set indicator 2032, such as in combination with Fig.15 In other examples, the pre-coding matrix type can be determined based on the SRS resource set indicator 2032 and the second SRI field 2036, such as in combination with Fig.17 As described in the example communication flow 1700. However, as Fig.21 and Fig. 22 As shown in the example, it can support Fig.14 Table 1400 shows all the different pre-coding matrix types.

[0202] Fig.21 Depicted is a table 2100 that facilitates mapping of type indicator and TPMI fields to an 8Tx precoding matrix as presented herein. Fig. 22 Depicted is a table 2200 that facilitates mapping of type indicator and TPMI fields to an 8Tx precoding matrix as presented herein. Fig.21 and Fig. 22 The tables can be read together and illustrate the support Fig.14 All possible pre-coding matrix types are indicated in the example table 1400 of .

[0203] Example tables 2100 and 2200 include a type indicator column 2102, a first TPMI field column 2104, a second TPMI field column 2106, and an 8Tx precoding matrix column 2108. The value of the type indicator column 2102 may correspond to Fig. 20 In the SRS resource set indicator 2032, the value of the first TPMI field column 2104 may correspond to the first TPMI field 2038 of the figure, and the value of the second TPMI field column 2106 may correspond to the second TPMI field 2040 of the figure. Fig.21 and Fig. 22 In the example of , the "TPMI 1" indication included in the first TPMI field column 2104 and / or the second TPMI field column 2106 corresponds to the precoding matrix indication for the first SRS resource set. In addition, the "TPMI 2" indication included in the first TPMI field column 2104 and / or the second TPMI field column 2106 corresponds to the precoding matrix indication for the second SRS resource set.

[0204] As described above, the first TPMI field 2038 and the second TPMI field 2040 may independently indicate the rank. Fig.21 and Fig. 22 In the example of , the combination of the values ​​of the type indicator column 2102, the first TPMI field column 2104, and the second TPMI field column 2106 may indicate the precoding matrix type. Fig.21 and Fig. 22 In the example of , when the type indicator is "0", the second TPMI field is reserved and the TPMI indicated by the first TPMI field is used for the 8Tx precoding matrix. When the type indicator is "1", the first TPMI field is reserved and the TPMI indicated by the second TPMI field is used for the 8Tx precoding matrix.

[0205] For example, in the first row 2110, the type indicator is "0", the first TPMI field is rank 1 ("1 layer"), and the second TPMI field is reserved. In this combination, the 8Tx precoding matrix has rank 1 type 1. In the second row 2112, the type indicator is "1", the first TPMI field is reserved, and the second TPMI field is rank 1 ("1 layer"). In this combination, the 8Tx precoding matrix has rank 1 type 2.

[0206] In the example where the type indicator is "2", the TPMI field and the TPMI indicated by the first TPMI field are used for the 8Tx precoding matrix. For example, in the third row 2114, the type indicator is "2", the first TPMI field is rank 2 ("2 layers"), and the second TPMI field is rank 2 ("2 layers"). Based on using the rank 2 precoding matrix in the first and second layers of the 8Tx precoding matrix, the UE may determine that the 8Tx precoding matrix has rank 4, type 3, as indicated by the rank 4 precoding matrix 1408 of Table 20. As another example, in Fig. 22 In row 2210 of , the type indicator is "2", the first TPMI field is rank 3 ("3 layers"), and the second TPMI field is rank 4 ("4 layers"). Based on the use of the rank 3 precoding matrix in the first layer of the 8Tx precoding matrix and the rank 4 precoding matrix in the second layer, the UE may determine that the 8Tx precoding matrix has rank 7, type 2, as indicated by the rank 7 precoding matrix 1414 of Table 20, where the first layer uses the 4Tx rank 3 precoding matrix and the second layer uses the 4Tx rank 4 precoding matrix.

[0207] exist Fig.15 , Fig.17 and Fig. 20 In an example of the present invention, the network node outputs an RRC configuration including two SRS resource sets, corresponding SRS resource set ports, and an 8-port UL MIMO indicator. In some examples, the network node may be configured to output a single SRS resource set, where the SRS resources are 8-port resources. In such an example, the network node may be configured to indicate which ports will use the first precoding matrix and which ports will use the second precoding matrix.

[0208] Fig.23 Illustrated is a communication flow 2300 between a network node 2302 and a UE 2304 as presented herein. Aspects of the communication flow 2300 facilitate precoding matrix indication when providing 8-port SRS resources.

[0209] exist Fig.23 In the example of , the network node 2302 outputs an RRC configuration 2310 received by the UE 2304. The RRC configuration 2310 includes an SRS resource set 2312, an 8-port SRS resource indicator 2314, a first port group configuration 2316, and a second port group configuration 2318. The port group (PG) configuration indicates which ports are associated with a precoding matrix. For example, the first port group configuration 2316 may indicate a first subset of ports associated with a first precoding matrix, and the second port group configuration 2318 may indicate a second subset of ports associated with a second precoding matrix. Fig.23In the example of , the first port group configuration 2316 indicates that ports 0, 1, 4, and 5 are associated with the first pre-coding matrix, and the second port group configuration 2318 indicates that ports 2, 3, 6, and 7 are associated with the second pre-coding matrix. However, other examples may include alternative combinations of ports and port groups. For example, the first port group may include ports 0, 1, 2, and 3, and the second port group may include ports 4, 5, 6, and 7. The ports in the respective port groups may correspond to Figure 4 For example, the port configuration 2320 may indicate the placement of antenna elements in the UE 2304. In this example, it can be understood that port 0 corresponds to the first antenna element 402a, port 1 corresponds to the third antenna element 402c, ..., port 6 corresponds to the sixth antenna element 402f, and port 7 corresponds to the eighth antenna element 402h.

[0210] After the network node 2302 configures the UE 2304 via the RRC configuration 2310, the network node 2302 may output control signaling 2330 that is received by the UE 2304. The control signaling 2330 may allow the UE 2304 to determine the 8Tx precoding matrix to apply when sending uplink transmissions to the network node 2302. Aspects of the control signaling 2330 may be similar to Fig.15 , Fig.17 and / or Fig. 20 control signaling, and therefore, UE 2304 can determine the 8Tx precoding matrix in a similar manner.

[0211] exist Fig.23 In the example of FIG. 2 , the control signaling 2330 includes a precoding matrix type indicator 2332, an SRI field 2334, a first TPMI field 2338, and a second TPMI field 2340. The precoding matrix type indicator 2332 may have a size of 2 bits and may be similar to Fig.15 , Fig.17 and / or Fig. 20 The SRI field 2334 may indicate an SRS resource set indicator. Fig.15 and Fig. 20 In the example described in which UE 2304 adopts the combination Fig.17 In an example of describing techniques to determine a precoding matrix type (e.g., via an SRS resource set indicator and a second SRI field), the control signaling 2330 may include an indicator bit 2336, which may be used with a precoding matrix type indicator 2332 to determine the precoding matrix type. At 2350, the UE 2304 may determine the 8Tx precoding matrix. The UE 2304 may then send an uplink transmission 2360 using the 8Tx precoding matrix.

[0212] The first TPMI field 2338 and the second TPMI field 2340 may be used to determine the first 4Tx pre-coding matrix and the second 4Tx pre-coding matrix, respectively. Fig.15 , Fig.17 and Fig. 20 Thus, in Fig.23 In the example of FIG. 23, UE 2304 may use the precoding matrix type indicator 2332, the first TPMI field 2338, and the second TPMI field 2340 to jointly determine the 8Tx precoding matrix, such as in combination with Fig.15 and Fig. 20 In other examples, the UE 2304 may use the precoding matrix type indicator 2332, the indicator bit 2336, the first TPMI field 2338, and the second TPMI field 2340 to determine the 8Tx precoding matrix, such as in combination with Fig.17 The examples are described.

[0213] In an example where an 8-port SRS is used (eg, Fig.23 ), the pre-coding matrix type is re-definable. Fig.24 Depicted is a table 2400 including precoding matrix types for rank 1 through rank 4 as presented herein. Fig.25 A table 2500 including precoding matrix types for rank 5 through rank 8 is depicted. Fig.24 and Fig.25 Aspects of the pre-decoding matrix type are similar to Fig.14 However, Fig.24 and Fig.25 The pre-decoding matrix types include permutation matrices (P G ). The permutation matrix represents the port group configuration. The permutation matrix can be defined by Formula 1 (as follows).

[0214] Formula 1: P G =[e 1,1 ,e 1,2 ,e 1,3 ,e 1,4 ,e 2,1 ,e 2,2 ,e 2,3 ,e 2,4 ]

[0215] In formula 1, the term (e i,j ) is a unit vector having a single non-zero (unit) element to represent the jth port in PG i. For example and with respect to a configuration in which the first port group configuration 2316 includes ports 0, 1, 4, and 5 and the second port group configuration 2318 includes ports 2, 3, 6, and 7 Fig.23In the example of , the permutation matrix can be represented by a permutation matrix 2420. The permutation matrix 2420 defines how the ports (eg, antenna elements) of the UE 2304 apply the 8Tx precoding matrix.

[0216] As described above, aspects disclosed herein facilitate reusing a 4Tx codebook for 8Tx MIMO transmissions. For example, a 4Tx non-coherent codebook may be mapped to an 8Tx non-coherent codebook, a 4Tx partially coherent codebook may be mapped to an 8Tx PC-2 codebook, and a 4Tx fully coherent codebook may be mapped to an 8Tx PC-4 codebook. However, it may be beneficial to support an 8Tx fully coherent codebook. Fig.26 An example of an 8Tx fully coherent (FC) codebook structure is illustrated in FIG.

[0217] exist Fig.26 2602. 8Tx FC rank 2 codebook may include 16 precoders and may be defined by rank 2 structure 2604. 8Tx FC rank 3 codebook may include 8 precoders and may be defined by rank 3 structure 2606. 8Tx FC rank 4 codebook may include 8 precoders and may be defined by rank 4 structure 2608. 8Tx FC rank 5 codebook may include 8 precoders and may be defined by rank 5 structure 2610. 8Tx FC rank 6 codebook may include 8 precoders and may be defined by rank 6 structure 2612. 8Tx FC rank 7 codebook may include 4 precoders (or 8 precoders) and may be defined by rank 7 structure 2614. The 8Tx FC rank 8 codebook may include 4 pre-decoders (or 8 pre-decoders) and may be defined by the rank 8 structure 2616. Fig.26 In the example structure of can be defined by formula 2620, and the term Can be defined by formula 2622.

[0218] Understandably, Fig.26 The example structure of is illustrative, and other examples may include additional or alternative structures for defining the 8TxFC codebook.

[0219] In an example where a precoding matrix from the 8Tx FC codebook is being used, the network node may output an FC codebook indicator to the UE to signal the UE to use the 8Tx FC codebook to determine the precoding matrix.

[0220] In such examples, the network node may signal that the 8Tx fully coherent codebook is being used by including a fully coherent (FC) codebook indicator with the control signaling to the UE. In some examples, the network node may include the FC codebook indicator with the control signaling to the UE. For example, in Fig.15 , Fig.17 and Fig. 20 In an example, the network node may output an FC codebook indicator (e.g., FC codebook indicator 1570, FC codebook indicator 1770, or FC codebook indicator 2070), which may indicate to the UE whether to use the FC codebook to determine the 8Tx precoding matrix or to use the NC / PC-2 / PC-4 codebook to determine the 8Tx precoding matrix. For example, the FC codebook indicator may be a 1-bit indicator indicating when the UE is to use the FC codebook. For example, when the FC codebook indicator is set to a first value (e.g., "0"), the UE may determine to use the 8Tx precoding matrix as previously described in conjunction with Fig.15 , Fig.17 and Fig. 20 In the example described in the example of , the NC / PC-2 / PC-4 codebook is used. In addition, when the FC codebook indicator is set to a second value (e.g., "1"), the UE may determine to use the FC codebook. In the example in which the FC codebook indicator indicates to use the FC codebook, the UE may determine the 8Tx FC precoding matrix using the first TPMI field and the second TPMI field.

[0221] Despite Fig.15 , Fig.17 and Fig. 20 In the example of , the example FC codebook indicator is illustrated as a separate communication compared to the control signaling from the network node to the UE, but in other examples, the FC codebook indicator may be included with the control signaling.

[0222] In some examples, the Fig.15 For example, and similar to Fig.17 In the example of , UE 1504 may determine the SRS resource using the first SRI field 1534. For example, when the first SRI field 1534 is set to "0", SRS resource 0 in the first SRS resource set as indicated by the first SRS resource set 1512 and SRS resource 0 in the second SRS resource set as indicated by the second SRS resource set 1516 are the indicated SRS resources. In addition, when the first SRI field 1534 is set to "1", SRS resource 1 in the first SRS resource set as indicated by the first SRS resource set 1512 and SRS resource 1 in the second SRS resource set as indicated by the second SRS resource set 1516 are the indicated SRS resources.

[0223] The UE 1504 may use the second SRI field 1536 to determine whether to use the FC codebook or the NC / PC-2 / PC-4 codebook. For example, when the second SRI field 1536 is set to a first value (e.g., "0"), the UE 1504 may determine to use the NC / PC-2 / PC-4 codebook, as previously described in conjunction with Fig.15 In such an example, the UE 1504 may use the two TPMI fields and the SRS resource set indicator 1532 to determine the 8Tx precoding matrix.

[0224] Additionally, when the second SRI field 1536 is set to a second value (eg, "1"), the UE 1504 may determine to use the FC codebook. In such an example, the UE 1504 may use two TPMI fields to determine the 8Tx FC precoding matrix.

[0225] In another example, the UE may use Fig. 20 For example, when the SRS resource set indicator 2032 is set to "0", "1" or "2", the UE 2004 may determine to use the NC / PC-2 / PC-4 codebook, as previously described in conjunction with Fig. 20 In such an example, the UE 2004 may use the two TPMI fields, the SRI field, and the SRS resource set indicator 2032 to determine the 8Tx precoding matrix.

[0226] In addition, when the SRS resource set indicator 2032 is set to "3", the UE 2004 may determine to use the FC codebook. In such an example, the UE 2004 may use two TPMI fields to determine the 8Tx FC precoding matrix.

[0227] Fig. 27 Depicted is a table 2700 that facilitates mapping of type indicator and TPMI fields to an 8Tx precoding matrix as presented herein. Fig.28 Depicted is a table 2800 that facilitates mapping of type indicator and TPMI fields to an 8Tx precoding matrix as presented herein. Fig. 27 and Fig.28 The tables can be read together and illustrate the support Fig.14 All possible precoding matrix types and 8Tx FC precoding matrices are indicated in the example table 1400. Fig. 27 and Fig.28 The example table is similar to Fig.21 and Fig. 22 , except that they include an additional row for type indicator "3". In the example where the type indicator is "3", UE 2004 may use two TPMI fields to determine the 8Tx FC precoding matrix.

[0228] exist Fig.15 , Fig.17 and Fig. 20 In the example, the network node outputs the same Figure 5The example control signaling 540 is similar to the control signaling of FIG. However, other examples may use different signaling to indicate the 8Tx precoding matrix.

[0229] Fig.29 2900 between a network node 2902 and a UE 2904 as presented herein. Aspects of the communication flow 2900 may be similar to Fig.23 For example, the network node 2902 may output an RRC configuration 2910 that is received by the UE 2904. The RRC configuration 2910 may configure the UE 2904 for 8Tx UL MIMO. Fig.29 In the example of , RRC configuration 2910 includes SRS resource set 2912, 8-port SRS resource indicator 2914, first port group configuration 2916 and second port group configuration 2918. The PG configuration indicates which ports are associated with the pre-coding matrix. Fig.29 As shown, first port group configuration 2916 indicates that ports 0, 1, 4, and 5 are associated with a first precoding matrix, and second port group configuration 2918 indicates that ports 2, 3, 6, and 7 are associated with a second precoding matrix. However, other examples may include alternative combinations of ports and port groups.

[0230] The network node 2902 outputs an uplink precoding matrix indication 2930 that is received by the UE 2904. The network node 2902 may output the uplink precoding matrix indication 2930 via a DCI. The uplink precoding matrix indication 2930 may indicate a precoding matrix type and a TPMI. Aspects of the precoding matrix type are combined Fig.24 and Fig.25 The example table is described below.

[0231] UE 2904 may use information from RRC configuration 2910 and uplink precoding matrix indication 2930 to determine 8Tx precoding matrix 2950. Fig.29 As shown, UE 2904 may send an uplink transmission 2960 obtained by network node 2902. UE 2904 may send uplink transmission 2960 using 8Tx precoding matrix 2950.

[0232] As described above, the 8Tx precoding matrix 2950 may be associated with a rank (e.g., rank 1, rank 2, ..., rank 8). In addition, the 8Tx precoding matrix 2950 may be associated with a type (e.g., type 1, type 2, etc.). The uplink precoding matrix indication 2930 may indicate a precoding matrix type and a TPMI for a 4Tx precoding matrix used in the 8Tx precoding matrix.

[0233] For rank 1 8Tx codebook, the precoding matrix can be associated with type 1 or type 2. In addition, there are 28 TPMI indices associated with the NC precoding matrix, the PC-2 precoding matrix, and the PC-4 matrix associated with rank 1, as shown in combination with Fig. 9 As described in Table 900.

[0234] Figures 30 to 47 An example table illustrating uplink precoding matrix indication 2930 for ranks 1 to 8 is depicted. Fig.30 In the example of , the first table 3000 illustrates an uplink precoding matrix indication 2930 for rank 1. As shown in the first table 3000, for a rank 1 NC precoding matrix, the uplink precoding matrix indication 3002 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3002 may also include a 2-bit TPMI field to indicate one of four states associated with 4Tx rank 1 TPMI indexes 0 to 3.

[0235] For rank 1 PC-2 precoding matrices, the uplink precoding matrix indication 3004 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3004 may also include a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 1 TPMI indexes 4 to 11.

[0236] For rank 1 PC-4 precoding matrices, the uplink precoding matrix indication 3006 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3006 may also include a 2-bit TPMI field to indicate one of 16 states associated with 4Tx rank 1 TPMI indexes 12-27.

[0237] For a rank 2 8 Tx codebook, the precoding matrix may be associated with type 1, type 2, or type 3, as shown in table 2400. Fig.30 The second table 3010 of exemplifies a first aspect for illustrating an uplink precoding matrix indication 2930 for rank 2. In the second table 3010, the uplink precoding matrix indication 2930 may be configured to indicate only a type 1 precoding matrix or a type 2 precoding matrix. For example, for a rank 2 NC precoding matrix, the uplink precoding matrix indication 3012 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3012 may also include a 3-bit TPMI field to indicate one of six states associated with 4Tx rank 2 TPMI indexes 0 to 5.

[0238] For rank 2 PC-2 precoding matrices, the uplink precoding matrix indication 3014 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3014 may also include a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6-13.

[0239] For rank 2 PC-4 precoding matrices, the uplink precoding matrix indication 3016 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3016 may also include a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14-21.

[0240] In another aspect, the uplink precoding matrix indication 2930 may be configured to indicate only the rank 2 type 3 precoding matrix. In such an example, the uplink precoding matrix indication 2930 may skip including the PG indication (e.g., the PG indication may be reserved or disabled). The uplink precoding matrix indication 2930 may also include two TPMI fields to indicate a first precoding matrix and a second precoding matrix associated with the rank 2 type 3 precoding matrix.

[0241] exist Fig.30 In the third table 3020 of , the uplink precoding matrix indication 2930 may be configured to indicate only the type 3 precoding matrix. For example, for a rank 2 NC precoding matrix, the uplink precoding matrix indication 3022 may include two 2-bit TPMI fields to indicate one of the four states associated with 4Tx rank 1 TPMI indexes 0 to 3.

[0242] For a rank 2 PC-2 precoding matrix, the uplink precoding matrix indication 3024 may include two 3-bit TPMI fields to indicate one of eight states associated with 4Tx rank 1 TPMI indexes 4 to 11.

[0243] For a rank 2 PC-4 precoding matrix, the uplink precoding matrix indication 3026 may include two 4-bit TPMI fields to indicate one of 16 states associated with 4Tx rank 1 TPMI indexes 12-27.

[0244] In some examples, the same pre-decoder restrictions may be applied to both PG configurations. For example, the first pre-decoding matrix and the second pre-decoding matrix may be configured to be the same (eg, W 4Tx,r＝1 =W′ 4Tx,r＝1 ). In such examples, the uplink precoding matrix indication 2930 associated with the third table 3020 may include a TPMI field.

[0245] In another aspect related to the rank 2 precoding matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1, type 2, or type 3 precoding matrices without restriction. In such an example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, or type 3. For example, code point "00" may indicate type 1, code point "01" may indicate type 2, code point "10" may indicate type 3, and code point "11" may be reserved. In another example, code point "00" may be reserved, code point "10" may indicate type 1, code point "01" may indicate type 2, and code point "11" may indicate type 3. However, other examples may utilize alternative mappings between code points and precoding matrix types.

[0246] In addition to the 2-bit PG indication, the uplink precoding matrix indication 2930 may include two TPMI fields to indicate the first 4Tx precoding matrix and the second 4Tx precoding matrix.

[0247] exist Fig.31 In the example of , the first table 3100 depicts indicating any of the type 1, type 2, or type 3 precoding matrices without restrictions. For example, for a rank 2 NC precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3102 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of the six states associated with 4Tx rank 2 TPMI indexes 0 to 5. In such an example, the second TPMI field may be reserved. For a rank 2 NC precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3104 may include a 2-bit PG indication and two 2-bit TPMI fields to indicate one of the four states associated with 4Tx rank 1 TPMI indexes 0 to 3.

[0248] For a rank 2 PC-2 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3106 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13. In such an example, the second TPMI field may be reserved. For a rank 2 PC-2 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3108 may include a 2-bit PG indication and two 3-bit TPMI fields to indicate one of eight states associated with 4Tx rank 1 TPMI indexes 4 to 11.

[0249] For a rank 2 PC-4 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3110 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21. In such an example, the second TPMI field may be reserved. For a rank 2 PC-4 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3112 may include a 2-bit PG indication and two 4-bit TPMI fields to indicate one of 16 states associated with 4Tx rank 1 TPMI indexes 12 to 27.

[0250] In another aspect related to the rank 2 precoding matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1, type 2, or type 3 precoding matrices with restrictions. In such an example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, or type 3, as described in conjunction with the PG indication of the first table 3100.

[0251] Additionally, the uplink precoding matrix indication 2930 may include the same precoder restrictions, such that the first precoding matrix and the second precoding matrix may be configured to be the same (eg, 4Tx,r＝1 =W′ 4Tx,r＝1 ). In such examples, for Type 1, Type 2, or Type 3, Fig.31 The uplink precoding matrix indication 2930 associated with the second table 3120 may include a TPMI field.

[0252] exist Fig.31 In the example of , the second table 3120 depicts indicating any of the type 1, type 2, or type 3 precoding matrices with restrictions. For example, for a rank 2 NC precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3122 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of six states associated with 4Tx rank 2 TPMI indexes 0 to 5. For a rank 2 NC precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3124 may include a 2-bit PG indication and a 2-bit TPMI field to indicate one of four states associated with 4Tx rank 1 TPMI indexes 0 to 3.

[0253] For a rank 2 PC-2 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3126 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13. For a rank 2 PC-2 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3128 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 1 TPMI indexes 4 to 11.

[0254] For a rank 2 PC-4 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3130 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21. For a rank 2 PC-4 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3132 may include a 2-bit PG indication and a 4-bit TPMI field to indicate one of 16 states associated with 4Tx rank 1 TPMI indexes 12 to 27.

[0255] For a rank 3 8 Tx codebook, the precoding matrix may be associated with type 1, type 2, type 3, or type 4, as shown in Table 2400. Fig.32 The first table 3200 of exemplifies a first aspect for illustrating an uplink precoding matrix indication 2930 for rank 3. In the first table 3200, the uplink precoding matrix indication 2930 may be configured to indicate only a type 1 precoding matrix or a type 2 precoding matrix. For example, for a rank 3 NC precoding matrix, the uplink precoding matrix indication 3202 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3202 may also include a 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0.

[0256] For rank 3 PC-2 precoding matrices, the uplink precoding matrix indication 3204 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3204 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1-2.

[0257] For rank 3 PC-4 precoding matrices, the uplink precoding matrix indication 3206 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3206 may also include a 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6.

[0258] In another aspect, the uplink precoding matrix indication 2930 may be configured to indicate only the rank 3 type 3 precoding matrix. In such an example, the uplink precoding matrix indication 2930 may skip including a PG indication (e.g., the PG indication may be reserved or disabled). The uplink precoding matrix indication 2930 may also include two TPMI fields to indicate a first precoding matrix and a second precoding matrix associated with the rank 3 type 3 precoding matrix.

[0259] exist Fig.32 In the second table 3210 of , the uplink precoding matrix indication 2930 may be configured to indicate only the type 3 precoding matrix. For example, for a rank 3 NC precoding matrix, the uplink precoding matrix indication 3212 may include a 3-bit first TPMI field to indicate one of the six states associated with 4Tx rank 2 TPMI indexes 0 to 5. The uplink precoding matrix indication 3212 may also include a 2-bit second TPMI field to indicate one of the four states associated with 4Tx rank 1 TPMI indexes 0 to 3.

[0260] For a rank 3 PC-2 precoding matrix, the uplink precoding matrix indication 3214 may include a 3-bit first TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13. The uplink precoding matrix indication 3214 may also include a 3-bit second TPMI field to indicate one of eight states associated with 4Tx rank 1 TPMI indexes 4 to 11.

[0261] For a rank 3 PC-4 precoding matrix, the uplink precoding matrix indication 3216 may include a 3-bit first TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21. The uplink precoding matrix indication 3216 may also include a 4-bit second TPMI field to indicate one of sixteen states associated with 4Tx rank 1 TPMI indexes 12 to 27.

[0262] In some examples, when the following restrictions apply, Fig.32 The second table 3210 uses a single TPMI field:

[0263] W 4Tx,r＝1 =[W 4Tx,r＝2 ]1

[0264] In the above restrictions, the item "[] x " means using the xth column of the matrix []. Therefore, in the above restrictions, the pre-decoding matrix (W 4Tx,r＝2 ) is used for the second pre-decoding matrix.

[0265] In another aspect related to indicating a rank 3 matrix, the uplink precoding matrix indication 2930 may be configured to indicate only a rank 3 type 4 precoding matrix. In such an example, the descriptions related to the first TPMI field and the second TPMI field of the second table 3210 may be swapped, such as Fig.32 As depicted in the third table 3220.

[0266] In another aspect related to indicating a rank 3 matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1 to 3 precoding matrices without restriction. For example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, or type 3, such as in combination with Fig.31 The PG indication of the first table 3100 is described.

[0267] In addition to the 2-bit PG indication, the uplink precoding matrix indication 2930 may include two TPMI fields to indicate the first 4Tx precoding matrix and the second 4Tx precoding matrix.

[0268] exist Fig.33 In the example of , table 3300 depicts indicating any of the type 1, type 2, or type 3 precoding matrices without restrictions. For example, for a rank 3 NC precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3302 may include a 2-bit PG indication and a 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0. In such an example, the second TPMI field may be reserved. For a rank 3 NC precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3304 may include a 2-bit PG indication, a first 3-bit TPMI field to indicate one of six states associated with 4Tx rank 2 TPMI indexes 0 to 5; and a second 2-bit TPMI field to indicate one of four states associated with 4Tx rank 1 TPMI indexes 0 to 3.

[0269] For a rank 3 PC-2 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3306 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2. In such an example, the second TPMI field may be reserved. For a rank 3 PC-2 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3308 may include a 2-bit PG indication, a first 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 1 TPMI indexes 4 to 11.

[0270] For a rank 3 PC-4 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3310 may include a 2-bit PG indication and a 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6. In such an example, the second TPMI field may be reserved. For a rank 3 PC-4 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3312 may include a 2-bit PG indication, a first 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21; and a second 4-bit TPMI field to indicate one of 16 states associated with 4Tx rank 1 TPMI indexes 12 to 27.

[0271] In another aspect related to indicating a rank 3 matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1 to 4 precoding matrices without restriction. For example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, type 3, or type 4 based on the code point.

[0272] In addition to the 2-bit PG indication, the uplink precoding matrix indication 2930 may include two TPMI fields to indicate the first 4Tx precoding matrix and the second 4Tx precoding matrix. In such an example, the indication of the type 1, type 2, or type 3 precoding matrix may be the same as Fig.33 The same as indicated in Table 3300.

[0273] To indicate the type-4 precoding matrix, descriptions associated with the first TPMI field and the second TPMI field of table 3300 related to the type-3 precoding matrix may be swapped.

[0274] For example, for a rank 3 NC precoding matrix indicating type 4 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3314 may include a 2-bit PG indication, a first 2-bit TPMI field to indicate one of four states associated with 4Tx rank 1 TPMI indexes 0 to 3; and a second 3-bit TPMI field to indicate one of six states associated with 4Tx rank 2 TPMI indexes 0 to 5.

[0275] For a rank 3 PC-2 precoding matrix indicating type 4 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3316 may include a 2-bit PG indication, a first 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 1 TPMI indices 4 to 11; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indices 6 to 13.

[0276] For a rank 3 PC-4 precoding matrix indicating type 4 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3318 may include a 2-bit PG indication, a first 4-bit TPMI field to indicate one of 16 states associated with 4Tx rank 1 TPMI indexes 12 to 27; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21.

[0277] In another aspect related to the rank 3 precoding matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1 to 3 precoding matrices with restrictions or any of the type 1 to 4 precoding matrices with restrictions. In such examples, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate the precoding matrix type via a code point.

[0278] In addition, the uplink precoding matrix indication 2930 may include a combination of Fig.32 The second table 3210 describes the same restricted single TPMI field (reproduced below):

[0279] W 4Tx,r＝1 =[W 4Tx,r＝2 ]1

[0280] The same pre-decoder restriction enables the first pre-decoding matrix and the second pre-decoding matrix to be configured to be the same (eg, 4Tx,r＝1 =W′ 4Tx,r＝1 ). In such examples, for types 1 to 3 or types 1 to 4, Fig.34 The uplink precoding matrix indication 2930 associated with the first table 3400 may include a TPMI field.

[0281] exist Fig.34 In the example of , the first table 3400 depicts indicating any one of the precoding matrix types 1 to 3 with restrictions or the precoding matrix types 1 to 4 with restrictions. For example, for a rank 3 NC precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3402 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one state associated with 4Tx rank 3 TPMI index 0. For a rank 3 NC precoding matrix indicating type 3 (or type 4) (e.g., based on a PG indication code point), the uplink precoding matrix indication 3404 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of the six states associated with 4Tx rank 2 TPMI indexes 0 to 5.

[0282] For a rank 3 PC-2 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3406 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2. For a rank 3 PC-2 precoding matrix indicating type 3 (or type 4) (e.g., based on a PG indication code point), the uplink precoding matrix indication 3408 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13.

[0283] For a rank 3 PC-4 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3410 may include a 2-bit PG indication and a 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6. For a rank 3 PC-4 precoding matrix indicating type 3 (or type 4) (e.g., based on a PG indication code point), the uplink precoding matrix indication 3412 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21.

[0284] For rank 4 8Tx codebook, the precoding matrix can be associated with type 1, type 2, or type 3, as shown in Table 2400. Fig.34The second table 3420 of exemplifies a first aspect for illustrating an uplink precoding matrix indication 2930 for rank 4. In the second table 3420, the uplink precoding matrix indication 2930 may be configured to indicate only a type 1 precoding matrix or a type 2 precoding matrix. For example, for a rank 4 NC precoding matrix, the uplink precoding matrix indication 3422 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3422 may also include a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0285] For rank 4 PC-2 precoding matrices, the uplink precoding matrix indication 3424 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3424 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1-2.

[0286] For rank 4 PC-4 precoding matrices, the uplink precoding matrix indication 3426 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3426 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3-4.

[0287] In another aspect, the uplink precoding matrix indication 2930 may be configured to indicate only the rank 4 type 3 precoding matrix. In such an example, the uplink precoding matrix indication 2930 may skip including a PG indication (e.g., the PG indication may be reserved or disabled). The uplink precoding matrix indication 2930 may also include two TPMI fields to indicate a first precoding matrix and a second precoding matrix associated with the rank 4 type 3 precoding matrix.

[0288] exist Fig.35 In the first table 3500 of , the uplink precoding matrix indication 2930 may be configured to indicate only a type 3 precoding matrix. For example, for a rank 4 NC precoding matrix, the uplink precoding matrix indication 3502 may include two 3-bit TPMI fields to indicate one of the six states associated with 4Tx rank 2 TPMI indexes 0 to 5.

[0289] For a rank 4 PC-2 precoding matrix, the uplink precoding matrix indication 3504 may include two 3-bit TPMI fields to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6-13.

[0290] For a rank 4 PC-4 precoding matrix, the uplink precoding matrix indication 3506 may include two 3-bit TPMI fields to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14-21.

[0291] In some examples, the same pre-decoder restrictions may be applied to both PG configurations. For example, the first pre-decoding matrix and the second pre-decoding matrix may be configured to be the same (eg, W 4Tx,r＝2 =W′ 4Tx,r＝2 ). In such examples, the uplink precoding matrix indication 2930 associated with the first table 3500 may include a TPMI field.

[0292] In another aspect related to the rank 4 precoding matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1, type 2, or type 3 precoding matrices without restriction. In such an example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, or type 3 based on the code point, such as in conjunction with Fig.31 As described in the first table 3100.

[0293] In addition to the 2-bit PG indication, the uplink precoding matrix indication 2930 may include two TPMI fields to indicate the first 4Tx precoding matrix and the second 4Tx precoding matrix.

[0294] exist Fig.35 In the example of , the second table 3510 depicts indicating any of the type 1, type 2, or type 3 precoding matrices without restrictions. For example, for a rank 4 NC precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3512 may include a 2-bit PG indication and a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0. In such an example, the second TPMI field may be reserved. For a rank 2 NC precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3514 may include a 2-bit PG indication and two 3-bit TPMI fields to indicate one of the six states associated with 4Tx rank 2 TPMI indexes 0 to 5.

[0295] For a rank 4 PC-2 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3516 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2. In such an example, the second TPMI field may be reserved. For a rank 4 PC-2 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3518 may include a 2-bit PG indication and two 3-bit TPMI fields to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13.

[0296] For a rank 4 PC-4 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3520 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4. In such an example, the second TPMI field may be reserved. For a rank 4 PC-4 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3522 may include a 2-bit PG indication and two 3-bit TPMI fields to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21.

[0297] In another aspect related to the rank 4 precoding matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1, type 2, or type 3 precoding matrices with restrictions. In such an example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, or type 3, as described in conjunction with the PG indication of the first table 3100.

[0298] Additionally, the uplink precoding matrix indication 2930 may include the same precoder restrictions, such that the first precoding matrix and the second precoding matrix may be configured to be the same (eg, 4Tx,r＝2 =W′ 4Tx,r＝2 ). In such examples, for Type 1, Type 2, or Type 3, Fig.36 The uplink precoding matrix indication 2930 associated with the first table 3600 may include a TPMI field.

[0299] exist Fig.36In the example of , the first table 3600 depicts indicating any of the type 1, type 2, or type 3 precoding matrices with restrictions. For example, for a rank 4 NC precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3602 may include a 2-bit PG indication and a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0. For a rank 4 NC precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3604 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of six states associated with 4Tx rank 2 TPMI indexes 0 to 5.

[0300] For a rank 4 PC-2 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3606 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2. For a rank 4 PC-2 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3608 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13.

[0301] For a rank 4 PC-4 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3610 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4. For a rank 4 PC-4 precoding matrix indicating type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3612 may include a 2-bit PG indication and a 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21.

[0302] For rank 5 8 Tx codebook, the precoding matrix can be associated with type 1, type 2, type 3, or type 4, as shown in Table 2400. Fig.36 The second table 3620 of FIG. 3620 illustrates a first aspect for illustrating an uplink precoding matrix indication 2930 for rank 5. In the second table 3620, the uplink precoding matrix indication 2930 may be configured to indicate only the matrix having the same matrix as the matrix in combination with the matrix. Fig.32 The second table 3210 describes an example restriction similar to the restriction for a type 1 precoding matrix or a type 2 precoding matrix. For example, the following restriction may be applied such that only one TPMI field is included in the uplink precoding matrix indication 2930:

[0303] W4Tx,r＝2 =[W 4Tx,r＝3 ]2

[0304] In the above constraints, the pre-coding matrix (W 4Tx,r＝3 ) is used for the second precoding matrix. For a rank 5 NC precoding matrix, the uplink precoding matrix indication 3622 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3622 may also include a 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0.

[0305] For rank 5 PC-2 precoding matrices, the uplink precoding matrix indication 3624 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3624 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1-2.

[0306] For rank 5 PC-4 precoding matrices, the uplink precoding matrix indication 3626 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3206 may also include a 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6.

[0307] In examples where only Type 1 is allowed, the PG indication may be disabled or reserved.

[0308] In another aspect related to the rank 5 8 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only the matrix having the same Fig.32 The example restrictions described in the second table 3210 are similar to those of the type 3 precoding matrix or the type 4 precoding matrix. For example, the following restrictions may be applied so that only one TPMI field is included in the uplink precoding matrix indication 2930:

[0309] W 4Tx,r＝1 =[W 4Tx,r＝4 ]1

[0310] In the above constraints, the pre-coding matrix (W 4Tx,r＝4 ) is used for the second pre-decoding matrix, such as Fig.36 As shown in the third table 3640 of . For the rank 5 NC precoding matrix, the uplink precoding matrix indication 3642 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 3 or type 4. The uplink precoding matrix indication 3642 may also include a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0311] For rank 5 PC-2 precoding matrices, the uplink precoding matrix indication 3644 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 3 or type 4. The uplink precoding matrix indication 3644 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI index 1-2.

[0312] For rank 5 PC-4 precoding matrices, the uplink precoding matrix indication 3646 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 3 or type 4. The uplink precoding matrix indication 3646 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0313] In examples where only Type 3 is allowed, the PG indication may be disabled or reserved.

[0314] In another aspect related to the rank 5 8 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only the matrix having the same Fig.32 The example restrictions described in the second table 3210 are similar to the restrictions on the type 1 precoding matrix or the type 2 precoding matrix. For example, the following restrictions may be applied so that the second precoding matrix can be derived from the first precoding matrix included in the uplink precoding matrix indication 2930:

[0315] W 4Tx,r＝2 =[W′ 4Tx,r＝3 ]2

[0316] In the above constraints, the pre-coding matrix (W′ 4Tx,r＝3 ) is used for the second precoding matrix. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝3 ", and the second TPMI field may indicate the precoding matrix "W' 4Tx,r＝3 ”, for Fig.37 The first table is 3700.

[0317] For a rank 5 NC precoding matrix, the uplink precoding matrix indication 3702 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3622 may also include a first 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0.

[0318] For rank 5 PC-2 precoding matrices, the uplink precoding matrix indication 3704 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3704 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2.

[0319] For a rank 5 PC-4 precoding matrix, the uplink precoding matrix indication 3706 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3706 may also include a first 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6; and a second 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6.

[0320] In examples where only Type 1 is allowed, the PG indication may be disabled or reserved.

[0321] In another aspect related to the rank 5 8 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only the matrix having the same Fig.32 The example restrictions described in the second table 3210 are similar to those of the type 3 precoding matrix or the type 4 precoding matrix. For example, the following restrictions may be applied so that the second precoding matrix can be derived from the first precoding matrix included in the uplink precoding matrix indication 2930:

[0322] W 4Tx,r＝1 =[W′ 4Tx,r＝4 ]1

[0323] In the above constraints, the pre-coding matrix (W′ 4Tx,r＝4 ) is used for the second precoding matrix. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝4 ", and the second TPMI field may indicate the precoding matrix "W' 4T,r＝4 ”, for Fig.37 The second table 3710.

[0324] For a rank 5 NC precoding matrix, the uplink precoding matrix indication 3712 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 3 or type 4. The uplink precoding matrix indication 3712 may also include a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0325] For a rank 5 PC-2 precoding matrix, the uplink precoding matrix indication 3714 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 3 or type 4. The uplink precoding matrix indication 3714 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2.

[0326] For a rank 5 PC-4 precoding matrix, the uplink precoding matrix indication 3716 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 3 or type 4. The uplink precoding matrix indication 3716 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0327] In examples where only Type 3 is allowed, the PG indication may be disabled or reserved.

[0328] In another aspect related to the rank 58 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only a type 1 precoding matrix or a type 2 precoding matrix having different TPMIs indicated by the first TPMI field and the second TPMI field of the uplink precoding matrix indication 2930. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝3 ", and the second TPMI field may indicate the precoding matrix "W 4Tx,r＝2 ”, for Fig.37 The third table 3720.

[0329] For the rank 5 NC precoding matrix, the uplink precoding matrix indication 3722 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3722 may also include a first 1-bit TPMI field to indicate one state associated with 4Tx rank 3 TPMI index 0; and a second 3-bit TPMI field to indicate one state among six states associated with 4Tx rank 2 TPMI indexes 0 to 5.

[0330] For a rank 5 PC-2 precoding matrix, the uplink precoding matrix indication 3724 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3724 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13.

[0331] For a rank 5 PC-4 precoding matrix, the uplink precoding matrix indication 3726 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 3726 may also include a first 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 3 TPMI indexes 14 to 21.

[0332] In examples where only Type 1 is allowed, the PG indication may be disabled or reserved.

[0333] In another aspect related to the rank 5 8 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only a type 3 precoding matrix or a type 4 precoding matrix having different TPMIs indicated by the first TPMI field and the second TPMI field of the uplink precoding matrix indication 2930. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝4 ", and the second TPMI field may indicate the precoding matrix "W 4Tx,r＝1 ”, for Fig.38 The first table is 3800.

[0334] For a rank 5 NC precoding matrix, the uplink precoding matrix indication 3802 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 3 or type 4. The uplink precoding matrix indication 3802 may also include a first 1-bit TPMI field to indicate one state associated with 4Tx rank 4 TPMI index 0; and a second 2-bit TPMI field to indicate one state among four states associated with 4Tx rank 1 TPMI indexes 0 to 3.

[0335] For a rank 5 PC-2 precoding matrix, the uplink precoding matrix indication 3804 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 3 or type 4. The uplink precoding matrix indication 3804 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 4 to 11.

[0336] For rank 5 PC-4 precoding matrices, the uplink precoding matrix indication 3806 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 3 or type 4. The uplink precoding matrix indication 3806 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 4-bit TPMI field to indicate one of 16 states associated with 4Tx rank 1 TPMI indexes 12 to 27.

[0337] In examples where only Type 3 is allowed, the PG indication may be disabled or reserved.

[0338] In another aspect related to the rank 5 precoding matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1 to 4 precoding matrices with restrictions. In such an example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate the precoding matrix type via a code point.

[0339] In addition, the uplink precoding matrix indication 2930 may include a combination of Fig.37 The first table 3700 and the second table 3710 describe the same restricted single TPMI field.

[0340] exist Fig.38 In the example of , the second table 3810 depicts indicating any of the precoding matrix types 1 to 4 with restrictions. For example, for a rank 5 NC precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3812 may include a 2-bit PG indication and a 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0. For a rank 5 NC precoding matrix indicating type 3 or type 4 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3814 may include a 2-bit PG indication and a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0341] For a rank 5 PC-2 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3816 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2. For a rank 5 PC-2 precoding matrix indicating type 3 or type 4 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3818 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2.

[0342] For a rank 5 PC-4 precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3820 may include a 2-bit PG indication and a 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6. For a rank 5 PC-4 precoding matrix indicating type 3 or type 4 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3822 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0343] In another aspect related to indicating a rank 5 matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1 to 4 precoding matrices with restrictions. For example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, type 3, or type 4 based on a PG indication code point.

[0344] In addition to the 2-bit PG indication, the uplink precoding matrix indication 2930 may include two TPMI fields to indicate the first 4Tx precoding matrix and the second 4Tx precoding matrix. In the example where the uplink precoding matrix indication 2930 indicates a type 1 or type 2 precoding matrix, the following restrictions may apply:

[0345] W 4Tx,r＝2 =[W′ 4Tx,r＝3 ]2

[0346] In the example where the uplink precoding matrix indication 2930 indicates a type 3 or type 4 precoding matrix, the following restrictions may apply:

[0347] W 4Tx,r＝1 =[W′ 4Tx,r＝4 ]1.

[0348] exist Fig.39In the example of, table 3900 depicts indicating any of a type 1, type 2, type 3, or type 4 precoding matrix with restrictions. For example, for a rank 5 NC precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3902 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0. For a rank 5 NC precoding matrix indicating type 3 or type 4 (e.g., based on a PG indication code point), the uplink precoding matrix indication 3904 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0349] For a rank 5 PC-2 precoding matrix indicating type 1 or type 2, the uplink precoding matrix indication 3906 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2. For a rank 5 PC-2 precoding matrix indicating type 3 or type 4, the uplink precoding matrix indication 3908 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2.

[0350] For a rank 5 PC-4 precoding matrix indicating type 1 or type 2, the uplink precoding matrix indication 3910 may include a 2-bit PG indication, a first 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6; and a second 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6. For a rank 5 PC-4 precoding matrix indicating type 3 or type 4, the uplink precoding matrix indication 3912 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0351] In another aspect related to indicating a rank 5 matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1 to 4 precoding matrices without restriction. For example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, type 3, or type 4 based on a PG indication code point.

[0352] In addition to the 2-bit PG indication, the uplink precoding matrix indication 2930 may include two TPMI fields to indicate the first 4Tx precoding matrix and the second 4Tx precoding matrix.

[0353] exist Fig.40 In the example of, the first table 4000 depicts indicating any of the type 1, type 2, type 3, or type 4 precoding matrices without restrictions. For example, for a rank 5 NC precoding matrix indicating type 1 or type 2 (e.g., based on a PG indication code point), the uplink precoding matrix indication 4002 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one state associated with 4Tx rank 3 TPMI index 0; and a second 3-bit TPMI field to indicate one of six states associated with 4Tx rank 2 TPMI indexes 0 to 5. For a rank 5 NC precoding matrix indicating type 3 or type 4 (e.g., based on a PG indication code point), the uplink precoding matrix indication 4004 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one state associated with 4Tx rank 4 TPMI index 0; and a second 2-bit TPMI field to indicate one of four states associated with 4Tx rank 1 TPMI indexes 0 to 3.

[0354] For a rank 5 PC-2 precoding matrix indicating type 1 or type 2, the uplink precoding matrix indication 4006 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13. For a rank 5 PC-2 precoding matrix indicating type 3 or type 4, the uplink precoding matrix indication 4008 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 1 TPMI indexes 4 to 11.

[0355] For a rank 5 PC-4 precoding matrix indicating type 1 or type 2, the uplink precoding matrix indication 4010 may include a 2-bit PG indication, a first 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21. For a rank 5 PC-4 precoding matrix indicating type 3 or type 4, the uplink precoding matrix indication 4012 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 4-bit TPMI field to indicate one of 16 states associated with 4Tx rank 1 TPMI indexes 12 to 27.

[0356] For rank 6 8Tx codebook, the precoding matrix can be associated with type 1, type 2, or type 3, as shown in Table 2400. Fig.40 The second table 4020 of exemplifies a first aspect for illustrating an uplink precoding matrix indication 2930 for rank 6. In the second table 4020, the uplink precoding matrix indication 2930 may be configured to indicate only a type 1 precoding matrix. In such an example, the uplink precoding matrix indication 2930 may skip including a PG indication (e.g., the PG indication may be reserved or disabled). The uplink precoding matrix indication 2930 may also include a TPMI field. In addition, the uplink precoding matrix indication 2930 may include the same precoder restrictions, such that the first precoding matrix and the second precoding matrix may be configured to be the same (e.g., W 4Tx,r＝3 =W′ 4Tx,r＝3 ). In such examples, Fig.40 The uplink precoding matrix indication 2930 associated with the second table 4020 may include a TPMI field.

[0357] like Fig.40 As shown in the second table 4020, for the rank 6 NC precoding matrix, the uplink precoding matrix indication 4022 may include a 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0.

[0358] For rank 6 PC-2 precoding matrix, uplink precoding matrix indication 4024 may include one 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI index 1-2.

[0359] For a rank 6 PC-4 precoding matrix, the uplink precoding matrix indication 4026 may include a 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6.

[0360] In another aspect related to the rank 6 8Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only a type 2 precoding matrix or a type 3 precoding matrix, wherein a single TPMI field is included in the uplink precoding matrix indication 2930. The uplink precoding matrix indication 2930 may include a 1-bit PG indicator to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. In examples where only type 2 is allowed, the PG indication may be disabled or reserved.

[0361] Additionally, the TPMI field of the uplink precoding matrix indication 2930 may include the following restrictions, such that a single TPMI field may be included in the uplink precoding matrix indication 2930:

[0362] W 4Tx,r＝2 =[W 4Tx,r＝4 ]2

[0363] In the above constraints, the pre-coding matrix (W 4Tx,r＝4 ) is used for the second pre-decoding matrix, such as Fig.41 As shown in the first table 4100. For the rank 6 NC precoding matrix, the uplink precoding matrix indication 4102 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. The uplink precoding matrix indication 4102 may also include a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0364] For rank 6 PC-2 precoding matrices, the uplink precoding matrix indication 4104 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. The uplink precoding matrix indication 4104 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI index 1-2.

[0365] For rank 6 PC-4 precoding matrices, the uplink precoding matrix indication 4106 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. The uplink precoding matrix indication 4106 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0366] In another aspect related to the rank 6 8Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only the matrix having the same Fig.32The example restrictions described in the second table 3210 are similar to those of the type 2 precoding matrix or the type 3 precoding matrix. For example, the following restrictions may be applied so that the second precoding matrix can be derived from the first precoding matrix included in the uplink precoding matrix indication 2930:

[0367] W 4Tx,r＝2 =[W′ 4Tx,r＝4 ]2

[0368] In the above constraints, the pre-coding matrix (W′ 4Tx,r＝4 ) is used for the second precoding matrix. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝4 ", and the second TPMI field may indicate the precoding matrix "W' 4Tx,r＝4 ”, for Fig.41 The second table 4110.

[0369] For the rank 6 NC precoding matrix, the uplink precoding matrix indication 4112 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. The uplink precoding matrix indication 4112 may also include a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0370] For rank 6 PC-2 precoding matrices, the uplink precoding matrix indication 4114 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. The uplink precoding matrix indication 4114 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2.

[0371] For rank 6 PC-4 precoding matrices, the uplink precoding matrix indication 4116 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. The uplink precoding matrix indication 4116 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0372] In examples where only Type 2 is allowed, the PG indication may be disabled or reserved.

[0373] In another aspect related to the rank 6 8Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only the matrix having the same Fig.31 The second table 3120 describes a type 1 precoding matrix with similar restrictions to the precoding restrictions. For example, two TPMI fields may be included in the uplink precoding matrix indication 2930, where the first TPMI field may correspond to the precoding matrix (“W 4Tx,r＝3 ”), and the second TPMI field may correspond to a precoding matrix (“W′ 4Tx,r＝3 ”).

[0374] exist Fig.41 In the third table 4120, the uplink precoding matrix indication 2930 may skip the PG indication (e.g., the PG indication field may be reserved or disabled). For the rank 6 NC precoding matrix, the uplink precoding matrix indication 4122 may include a first 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0.

[0375] For a rank 6 PC-2 precoding matrix, the uplink precoding matrix indication 4124 may include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2.

[0376] For a rank 6 PC-4 precoding matrix, the uplink precoding matrix indication 4126 may include a first 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6; and a second 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6.

[0377] In another aspect related to the rank 6 8 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only a type 2 precoding matrix or a type 3 precoding matrix having different TPMIs indicated by the first TPMI field and the second TPMI field of the uplink precoding matrix indication 2930. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝4 ", and the second TPMI field may indicate the precoding matrix "W 4Tx,r＝2 ”, for Fig.42 The first table is 4200.

[0378] For a rank 6 NC precoding matrix, the uplink precoding matrix indication 4202 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. The uplink precoding matrix indication 4202 may also include a first 1-bit TPMI field to indicate one state associated with 4Tx rank 4 TPMI index 0; and a second 3-bit TPMI field to indicate one state among six states associated with 4Tx rank 2 TPMI indexes 0 to 5.

[0379] For rank 6 PC-2 precoding matrices, the uplink precoding matrix indication 4204 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. The uplink precoding matrix indication 4204 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13.

[0380] For rank 6 PC-4 precoding matrices, the uplink precoding matrix indication 4206 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 2 or type 3. The uplink precoding matrix indication 4206 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 3 TPMI indexes 14 to 21.

[0381] In examples where only Type 2 is allowed, the PG indication may be disabled or reserved.

[0382] In another aspect related to the rank 6 precoding matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1 to 3 precoding matrices with restrictions. In such an example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate the precoding matrix type via a code point.

[0383] In addition, the uplink precoding matrix indication 2930 may include a first restriction (eg, 4Tx,r＝3 =W′ 4Tx,r＝3 ) and a second restriction (e.g., W 4Tx,r＝2 =[W 4Tx,r＝4 ]2) a single TPMI field.

[0384] exist Fig.52In the example of , the second table 4210 depicts indicating any of the precoding matrix types 1 to 3 with restrictions. For example, for a rank 6 NC precoding matrix indicating type 1 (e.g., based on a PG indication code point), the uplink precoding matrix indication 4212 may include a 2-bit PG indication and a 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0. For a rank 6 NC precoding matrix indicating type 2 or type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 4214 may include a 2-bit PG indication and a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0385] For a rank 6 PC-2 precoding matrix indicating type 1, the uplink precoding matrix indication 4216 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2. For a rank 6 PC-2 precoding matrix indicating type 2 or type 3, the uplink precoding matrix indication 4218 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2.

[0386] For a rank 6 PC-4 precoding matrix indicating type 1, the uplink precoding matrix indication 4220 may include a 2-bit PG indication and a 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6. For a rank 6 PC-4 precoding matrix indicating type 2 or type 3, the uplink precoding matrix indication 4222 may include a 2-bit PG indication and a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0387] In another aspect related to indicating a rank 6 precoding matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1 to 3 precoding matrices with restrictions. For example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, or type 3 based on a PG indication code point.

[0388] In addition to the 2-bit PG indication, the uplink precoding matrix indication 2930 may include two TPMI fields to indicate the first 4Tx precoding matrix and the second 4Tx precoding matrix. In the example where the uplink precoding matrix indication 2930 indicates a type 1 precoding matrix, a first restriction (e.g., W 4Tx,r＝3 =W′ 4Tx,r＝3 In the example where the uplink precoding matrix indication 2930 indicates a type 2 or type 3 precoding matrix, a second restriction may be applied (eg,4Tx,r＝2 =[W 4Tx,r＝4 ]2).

[0389] exist Fig.43 In the example of, table 4300 depicts indicating any of the type 1, type 2, or type 3 precoding matrices with restrictions. For example, for a rank 6 NC precoding matrix indicating type 1 (e.g., based on a PG indication code point), the uplink precoding matrix indication 4302 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0. For a rank 6 NC precoding matrix indicating type 2 or type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 4304 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0390] For a rank 6 PC-2 precoding matrix indicating type 1, the uplink precoding matrix indication 4306 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2. For a rank 6 PC-2 precoding matrix indicating type 2 or type 3, the uplink precoding matrix indication 4308 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2.

[0391] For a rank 6 PC-4 precoding matrix indicating type 1, the uplink precoding matrix indication 4310 may include a 2-bit PG indication, a first 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6; and a second 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6. For a rank 6 PC-4 precoding matrix indicating type 2 or type 3, the uplink precoding matrix indication 4312 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0392] In another aspect related to indicating a rank 6 matrix, the uplink precoding matrix indication 2930 may be configured to indicate any of the type 1 to 3 precoding matrices without restriction. For example, the uplink precoding matrix indication 2930 may include a 2-bit PG indication to indicate type 1, type 2, or type 3 based on a PG indication code point.

[0393] In addition to the 2-bit PG indication, the uplink precoding matrix indication 2930 may include two TPMI fields to indicate the first 4Tx precoding matrix and the second 4Tx precoding matrix.

[0394] exist Fig.44 In the example of, the first table 4400 depicts indicating any of the type 1, type 2, or type 3 precoding matrices without restrictions. For example, for a rank 6 NC precoding matrix indicating type 1 (e.g., based on a PG indication code point), the uplink precoding matrix indication 4402 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0. For a rank 6 NC precoding matrix indicating type 2 or type 3 (e.g., based on a PG indication code point), the uplink precoding matrix indication 4404 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 3-bit TPMI field to indicate one of six states associated with 4Tx rank 2 TPMI indexes 0 to 5.

[0395] For a rank 6 PC-2 precoding matrix indicating type 1, the uplink precoding matrix indication 4406 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2. For a rank 6 PC-2 precoding matrix indicating type 2 or type 3, the uplink precoding matrix indication 4408 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 6 to 13.

[0396] For a rank 6 PC-4 precoding matrix indicating type 1, the uplink precoding matrix indication 4410 may include a 2-bit PG indication, a first 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6; and a second 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6. For a rank 6 PC-4 precoding matrix indicating type 2 or type 3, the uplink precoding matrix indication 4412 may include a 2-bit PG indication, a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 3-bit TPMI field to indicate one of eight states associated with 4Tx rank 2 TPMI indexes 14 to 21.

[0397] For rank 7 8 Tx codebook, the precoding matrix can be associated with type 1 or type 2, as shown in Table 2400. Fig.44 The second table 4420 of exemplifies a first aspect for illustrating an uplink precoding matrix indication 2930 for rank 7. In the second table 4420, the uplink precoding matrix indication 2930 may be configured to indicate only a type 1 precoding matrix. In such an example, the uplink precoding matrix indication 2930 may skip including a PG indication (e.g., the PG indication may be reserved or disabled). The uplink precoding matrix indication 2930 may also include a TPMI field. In addition, the uplink precoding matrix indication 2930 may include the following restrictions on the TPMI field:

[0398] W 4Tx,r＝3 =[W 4Tx,r＝4 ]3

[0399] In the above constraints, the pre-coding matrix (W 4Tx,r＝4 ) is used for the second pre-decoding matrix, such as Fig.44 As shown in the second table 4420. For the rank 7 NC precoding matrix, the uplink precoding matrix indication 4422 may include a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0400] For rank 7 PC-2 precoding matrices, the uplink precoding matrix indication 4424 may include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1-2.

[0401] For rank 7 PC-4 precoding matrices, the uplink precoding matrix indication 4426 may include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0402] In another aspect related to the rank-7 8Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only a type-1 precoding matrix or a type-2 precoding matrix, wherein a single TPMI field is included in the uplink precoding matrix indication 2930. The uplink precoding matrix indication 2930 may include a 1-bit PG indicator to indicate whether the 8Tx precoding matrix is ​​type-1 or type-2.

[0403] Additionally, the TPMI field of the uplink precoding matrix indication 2930 may include the following restrictions, such that a single TPMI field may be included in the uplink precoding matrix indication 2930:

[0404] W 4Tx,r＝3 =[W 4Tx,r＝4 ]3

[0405] In the above constraints, the pre-coding matrix (W 4Tx,r＝4 ) is used for the second pre-decoding matrix, such as Fig.45 As shown in the first table 4500 of . For the rank 7 NC precoding matrix, the uplink precoding matrix indication 4502 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 4502 may also include a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0406] For rank 7 PC-2 precoding matrices, the uplink precoding matrix indication 4504 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 4504 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1-2.

[0407] For rank 7 PC-4 precoding matrices, the uplink precoding matrix indication 4506 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 4506 may also include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3-4.

[0408] In another aspect related to the rank 7 8 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only the matrix having the same Fig.32 The example restrictions described in the second table 3210 are similar to the restrictions on the type 1 precoding matrix. For example, the following restrictions may be applied so that the second precoding matrix can be derived from the first precoding matrix included in the uplink precoding matrix indication 2930:

[0409] W 4Tx,r＝3 =[W′4Tx,r＝4 ]3

[0410] In the above constraints, the pre-coding matrix (W′ 4Tx,r＝4 ) is used for the second precoding matrix. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝4 ", and the second TPMI field may indicate the precoding matrix "W' 4Tx,r＝4 ”, for Fig.45 In the second table 4510, the PG indication may be disabled or reserved.

[0411] For a rank 7 NC precoding matrix, the uplink precoding matrix indication 4512 may include a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0412] For a rank 7 PC-2 precoding matrix, the uplink precoding matrix indication 4514 may include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2.

[0413] For a rank 7 PC-4 precoding matrix, the uplink precoding matrix indication 4516 may include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0414] In another aspect related to the rank 7 8 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate a matrix having a combination with Fig.45 The example restrictions described in the second table 4510 are similar to the restrictions on the type 1 precoding matrix or the type 2 precoding matrix. For example, the following restrictions may be applied so that the second precoding matrix can be derived from the first precoding matrix included in the uplink precoding matrix indication 2930:

[0415] W 4Tx,r＝3 =[W′ 4Tx,r＝4 ]3

[0416] In the above constraints, the pre-coding matrix (W′ 4Tx,r＝4 ) is used for the second precoding matrix. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝4 ", and the second TPMI field may indicate the precoding matrix "W' 4Tx,r＝4”, for Fig.45 The third table 4520.

[0417] For the rank 7 NC precoding matrix, the uplink precoding matrix indication 4522 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 4522 may also include a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0418] For rank 7 PC-2 precoding matrices, the uplink precoding matrix indication 4524 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 4524 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2.

[0419] For rank 7 PC-4 precoding matrices, the uplink precoding matrix indication 4526 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 4526 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0420] In another aspect related to the rank 7 8 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only the type 1 precoding matrix without restriction. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝4 ", and the second TPMI field may indicate the precoding matrix "W 4Tx,r＝3 ”, for Fig.46 In the first table 4600, the PG indication may be disabled or reserved.

[0421] For a rank 7 NC precoding matrix, the uplink precoding matrix indication 4602 may include a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0.

[0422] For a rank 7 PC-2 precoding matrix, the uplink precoding matrix indication 4604 may include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2.

[0423] For a rank 7 PC-4 precoding matrix, the uplink precoding matrix indication 4606 may include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 1-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6.

[0424] In another aspect related to the rank 7 8 Tx codebook, the uplink precoding matrix indication 2930 may be configured to indicate only the type 1 precoding matrix without restriction. For example, the first TPMI field may indicate the precoding matrix “W 4Tx,r＝4 ", and the second TPMI field may indicate the precoding matrix "W 4Tx,r＝3 ”, for Fig.46 The second table 4610.

[0425] For the rank 7 NC precoding matrix, the uplink precoding matrix indication 4612 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 4612 may also include a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 3 TPMI index 0.

[0426] For rank 7 PC-2 precoding matrices, the uplink precoding matrix indication 4614 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 4614 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 3 TPMI indexes 1 to 2.

[0427] For rank 7 PC-4 precoding matrices, the uplink precoding matrix indication 4616 may include a 1-bit PG indication to indicate whether the 8Tx precoding matrix is ​​type 1 or type 2. The uplink precoding matrix indication 4616 may also include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 2-bit TPMI field to indicate one of four states associated with 4Tx rank 3 TPMI indexes 3 to 6.

[0428] For a rank 8 8Tx codebook, the precoding matrix may be associated with type 1, as shown in Table 2400. Fig.47 The first table 4710 of FIG. 47 illustrates a first aspect for illustrating an uplink precoding matrix indication 2930 for rank 8. With respect to indicating a precoding matrix from a rank 8 8Tx codebook, a PG indication is not required (e.g., the PG indication may be reserved or disabled). In the first table 4710, the uplink precoding matrix indication 2930 may be configured with restrictions (e.g., W 4Tx,r＝4 =W′ 4Tx,r＝4 ). This restriction may help reduce signaling overhead because the uplink precoding matrix indication 2930 may be configured to include a TPMI field to indicate the first precoding matrix and the second precoding matrix.

[0429] For rank 8 NC precoding matrix, uplink precoding matrix indication 4702 may include a 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0430] For rank 8 PC-2 precoding matrix, uplink precoding matrix indication 4704 may include one 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI index 1-2.

[0431] For rank 8 PC-4 precoding matrix, uplink precoding matrix indication 4706 may include a 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI index 3-4.

[0432] In another aspect related to the rank 8 8Tx codebook, the uplink precoding matrix indication 2930 may be configured to have no restrictions on the first precoding matrix and the second precoding matrix, such as in combination with Fig.47 As described in the second table 4710. In such an example, the uplink precoding matrix indication 2930 may be configured to include two TPMI fields to indicate the first precoding matrix and the second precoding matrix.

[0433] For a rank 8 NC precoding matrix, the uplink precoding matrix indication 4712 may include a first 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0; and a second 1-bit TPMI field to indicate a state associated with 4Tx rank 4 TPMI index 0.

[0434] For a rank 8 PC-2 precoding matrix, the uplink precoding matrix indication 4714 may include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 1 to 2.

[0435] For a rank 8 PC-4 precoding matrix, the uplink precoding matrix indication 4716 may include a first 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4; and a second 1-bit TPMI field to indicate one of two states associated with 4Tx rank 4 TPMI indexes 3 to 4.

[0436] In some aspects, the non-coherent and partially coherent codebook designs may include the base station transmitting a radio resource control (RRC) and a medium access control-control element (MAC-CE) that down-selects four antenna ports to be used, and then the base station transmits a DCI indicating a precoding matrix for the PUSCH. Thus, four ports are selected from the eight antenna ports via RRC and / or MAC-CE signaling, and then the 4-port codebook is applied to the selected four antenna ports. As an example, for rank 1 transmission, RRC / MAC-CE 4 ports are down-selected. The matrix becomes Similarly, for rank 2 transmission, select RRC / MAC-CE 4 ports downward The matrix becomes For rank 3 transmission, select the RRC / MAC-CE4 port downward. The matrix becomes matrix (or a single matrix with subsampling). For rank 4 transmission, select down the RRC / MAC-CE 4 ports The matrix becomes a single matrix.

[0437] For a DFT codebook with oversampling factor 2 and co-phase, rank 1 may have 32 matrices, rank 2 may have 16 matrices, rank 3 may have 8 matrices, and rank 4 may have 8 matrices 8. In some aspects, the matrices may be expanded according to a 4×4 Householder design.

[0438] Fig.48Illustrated is an example table 4800 showing example TPMI bit fields for UL 8Tx MIMO when the maximum rank is 2, 3, or 4. The table illustrates examples of fully coherent (FC), four-antenna partially coherent (PC-4), two-antenna partially coherent (PC-2), and non-coherent (NC) transmissions. Fig.49 Illustrated is an example table 4900 showing example bit fields of the second TPMI field for 8Tx ranks 1-4 when the maximum rank is 2, 3, or 4. The second TPMI field may include information to be used in a DCI scheduling a PUSCH with the same number of layers indicated by the first TPMI field.

[0439] As presented herein, a single precoder may be used for each of ranks 5-8. In some aspects, rank "R", a non-coherent single precoder may be applied to 4 ports selected from 8 ports in RRC signaling or MAC-CE, and one or more additional ports may be used based on a port selection mechanism. The one or more additional ports may correspond to rank R-4, for example, for 4 ports indicated by the network. For the additional antenna ports, the UE may select the port with the lowest index that was not selected in the RRC signaling or MAC-CE.

[0440] For example, for rank 5, in the case where the UE receives signaling from a base station selecting antenna ports 2-3-6-7 among 8 antenna ports, the UE may select antenna port 0 which has the lowest index and is not among the four selected antenna ports. This selection may be expressed as:

[0441] Rank 5 selects 2-3-6-7-0, and the rank 5 predecoder can be

[0442] Similarly, for rank 6 transmission, the UE may select antenna port 0 and antenna port 1 as having the lowest index. This can be expressed as:

[0443] Rank 6 selects 2-3-6-7-0-1, and the rank 6 pre-decoder can be

[0444] Similarly, for rank 7 transmission, the UE may select antenna port 0, antenna port 1, and antenna port 2 as having the lowest index. This may be expressed as:

[0445] Rank 7 selects 2-3-6-7-0-1-4, and the rank 7 pre-decoder can be

[0446] Similarly, for rank 8 transmission, the UE may select antenna port 0, antenna port 1, antenna port 4, and antenna port 5 in order of lowest index. This may be expressed as:

[0447] Rank 8 selects 2-3-6-7-0-1-4-5, and the rank 8 predecoder can be

[0448]

[0449] In another example, four antenna ports may be indicated to the UE via RRC signaling or MAC-CE, and the UE may select one or more additional antenna ports up to the corresponding rank based on the order indicated by the network. For example, the antenna ports may be grouped into antenna port groups or sets of antenna ports, and each group may have antenna ports in a specific order. For rank "R" non-coherent transmission, a single pre-decoder may select 4 ports in the first set + (R-4) ports in the second set based on the order of the antenna ports within the set.

[0450] For example, for rank 5 transmission, when the first set is 0-4-1-5 and the second set is 2-6-3-7, and the first set is indicated in RRC signaling or MAC-CE, the UE can select antenna port 0, antenna port 4, antenna port 1, antenna port 5, and antenna port 2, because antenna port 2 is the first antenna port in the second set. This selection can be expressed as:

[0451] Rank 5 selects 0-4-1-5-2, and the rank 5 predecoder can be

[0452] For rank 6 transmission, the UE may select antenna ports 0-4-1-5-2-6. For rank 7 transmission, the UE may select antenna ports 0-4-1-5-2-6-3. For rank 8 transmission, the UE may select antenna ports 0-4-1-5-2-6-3-7. Examples of pre-decoders for ranks 6, 7, and 8 may be:

[0453]

[0454] In some aspects, there may be two default sets of four antenna ports. The UE may apply the default set unless the antenna port set is configured for the UE, for example, by the base station signaling the UE. In some aspects, the default set may be antenna ports 0-4-1-5 and antenna ports 2-6-3-7.

[0455] In some aspects, a coherent port pair may be provided. The port pair may be configured, defined, or fixed. As an example, for 8 antenna ports, the first coherent antenna port pair may be 0-4, the second coherent antenna port pair may be 1-5, the third coherent antenna port pair may be 2-6, and the fourth coherent antenna port pair may be 3-7. Two pre-decoders may be provided for each rank of rank 5-8.

[0456] In some aspects, the 4-layer pre-decoder can be applied on the 4 antenna ports selected downward by RRC signaling or MAC-CE+Additional (R-4) layer using port pairs that are not included in the 4 ports selected downward and follow a specific order. For example, the selection order in the port pairs can be 0-4, 1-5, 2-6, 3-7.

[0457] There may be commonalities of application. For example, the following commonalities: Can be applied to an additional layer and common [1;-1]], [1;-j]] may be applied to an additional two layers. In the example where the downwardly selected ports are 0-4-1-5, then for rank 5 transmission, the UE may use a 4-layer predecoder for antenna ports 0-4-1-5, and may use an additional layer on ports 2-6 which are the next port pair in the order of port pairs. For rank 6 transmission, the UE may use a 4-layer predecoder for antenna ports 0-4-1-5, and may use an additional two layers on ports 2-6 which are the next port pair in the order of port pairs. For rank 7 transmission, the UE may use a 4-layer predecoder for antenna ports 0-4-1-5, and may use an additional two layers on ports 2-6 and one layer on ports 3-7 which are the next port pair. For rank 8 transmission, the UE may use a 4-layer predecoder for antenna ports 0-4-1-5, and may use an additional two layers on ports 2-6 and an additional two layers on ports 3-7. Fig.50 Example precoding matrices for rank 5-8 examples are illustrated, including, for example, a precoding matrix 5000 for rank 5, a precoding matrix 5010 for rank 6, a precoding matrix 5020 for rank 7, and a precoding matrix 5030 for rank 8.

[0458] In some aspects, two 4-port sets may be configured for a UE via RRC signaling and / or MAC-CE. For transmission of rank R, the UE may apply a 4-layer precoder for the 4 ports in the first set signaled to the UE, and may transmit the R-4 layers using antenna port pairs in the second set in sequence. As an example, the first set may be antenna ports 0-4, 1-5, and the second set may be antenna ports 2-6, 3-7, in sequence.

[0459] In some aspects, there may be fixed or configured groups of coherent antenna ports. As an example, a first group or set of coherent antenna ports may be antenna ports 0-4-1-5, and a second group of coherent antenna ports may be antenna ports 2-6-3-7. Two pre-decoders may be provided for each of ranks 5, 6, 7, and 8. The UE may apply coherent combining with orthogonal sequences of length 4 for the antenna port groups. As an example, the orthogonal sequence of length 4 for the antenna port groups may be:

[0460] {[1; 1; 1; 1],[1; -1; 1; -1],[1; 1; -1; -1],[1; -1, -1, 1]} or

[0461] {[1;1;j;j],[1;-1;j;-j],[1;1;-j;-j],[1;-1,-j,j]}

[0462] For transmission with rank R, ceil(R / 2) layers may be transmitted for the first port group, and floor(R / 2) layers may be transmitted for the second port group.

[0463] As an example, for rank 5 transmission, the UE may transmit 3 layers using antenna ports from the first antenna port group and may transmit 2 layers using antenna ports from the second antenna port group. For rank 6 transmission, the UE may transmit 3 layers using antenna ports from the first antenna port group and may transmit 3 layers using antenna ports from the second antenna port group. For rank 7 transmission, the UE may transmit 4 layers using antenna ports from the first antenna port group and may transmit 3 layers using antenna ports from the second antenna port group. For rank 8 transmission, the UE may transmit 4 layers using antenna ports from the first antenna port group and may transmit 4 layers using antenna ports from the second antenna port group. The UE may apply scaling to transmission. The UE may apply a first scaling to transmissions from antennas in the first antenna port group and may apply a second scaling to transmissions from antennas in the second antenna port group. As an example, the UE may apply scaling for the first antenna port group. The first scaling and can be applied to the second port group The scaling is based on the number of layers or the number of antenna ports used from the corresponding antenna port group, e.g. and for the second antenna port group Fig.51 Two example predecoders for each of ranks 5, 6, 7, and 8 are illustrated, including, for example, predecoders 5102 and 5104 for rank 5, predecoders 5106 and 5108 for rank 6, predecoders 5110 and 5112 for rank 7, and predecoders 5114 and 5116 for rank 8.

[0464] In some aspects, for rank R, the UE may transmit using 4 layers for the first antenna port group and R-4 layers for the second antenna port group. In this example, for rank 5 transmission, the UE may transmit 4 layers using antenna ports from the first antenna port group and transmit 1 layer using antenna ports from the second antenna port group. For rank 6 transmission, the UE may transmit 4 layers using antenna ports from the first antenna port group and transmit 2 layers using antenna ports from the second antenna port group. For rank 7 transmission, the UE may transmit 4 layers using antenna ports from the first antenna port group and transmit 3 layers using antenna ports from the second antenna port group. For rank 8 transmission, the UE may transmit 4 layers using antenna ports from the first antenna port group and transmit 4 layers using antenna ports from the second antenna port group. In this example, the UE may apply transmissions using antennas in the first port group. and applies a scaling factor of The scaling factor of . Fig.52 Two example predecoders for each of ranks 5, 6, 7 and 8 are illustrated, for example, including predecoders 5202 and 5204 for rank 5, predecoders 5206 and 5208 for rank 6, predecoders 5210 and 5212 for rank 7, and predecoders 5214 and 5216 for rank 8.

[0465] In some aspects, the DFT codebook may be used for 8Tx UL MIMO with an oversampling factor of 2 and using co-phasing. As an example, precoding for 8Tx UL MIMO transmissions may be based on a subsampled version of the 8Tx downlink codebook, e.g., where N1=4, N2=1, O1=2, O2=1. For the QPSK element, even i1 values ​​may be used, which provides 8 precoders for ranks 5 and 6, and 4 precoders for ranks 7 and 8. Alternatively, in the case of using 8-PSK, the rank 7 and rank 8 codebooks may also each have 8 precoders. Fig.53 8 pre-decoders for rank 5 5302, 8 pre-decoders for rank 6 5304, 4 or 8 pre-decoders for rank 7 5306, and 4 or 8 pre-decoders for rank 8 5308 are illustrated. Fig.53 In the example, and

[0466] In another example, the codebook for ranks 5-8 may be based on a codebook optimized for spatially uncorrelated channels. As an example, the codebook may be based on a combination of two 4×4 Householder matrices that may be used for DL ​​4Tx (which may be referred to as stacking). The UE may apply co-phasing between two different antenna groups. The co-phasing parameter may be expressed as

[0467] As an example, the codebook for rank 5-8 transmission may be based on:

[0468]

[0469] In this matrix, or {1,-1}, and [H 4,l ] (r) is a 4×r matrix with r columns selected from H 4,l The 4 columns of , r = 1, 2, 3, 4, correspond to ranks 5, 6, 7, 8.

[0470] In order to construct this Householder-based codebook, the common parameters u l ,l=0,…,L-1 is based on selecting a set of good rank 1 vectors w l ,l=0,…,L-1.

[0471] Then, obtain the corresponding Householder vector u l , so that the first column of the Householder matrix is ​​equal to w l Then, using the Householder vector H4, l The rank-4 codebook is obtained by using a 4×4 Householder matrix. For example, the UE may use a 4Tx downlink precoding matrix with elements in L=16, which has the following Householder matrix / vector.

[0472]

[0473] In some aspects, the UE may use a subset of the 4Tx precoders with a common phase to construct an 8Tx precoder for 8Tx UL MIMO transmission. In some aspects, the 4Tx precoder, e.g. It can be a DL 4Tx or other precoder. In some aspects, the 4Tx precoder can be a precoder for a different RAT than the UL MIMO transmission. As an example, a UE can transmit an NR UL MIMO transmission using an 8Tx precoder that uses a subset of the LTE DL 4Tx precoder with the same phase to construct an 8Tx precoder for the NR 8Tx UL MIMO transmission. As shown below, there can be

[0474] For the common phase, there are four options. Fig.54 An example of W 5402 for the first option (0) is illustrated, for example W for the second option (1), e.g. W for the third option (2), e.g. and W for the fourth option (3), e.g. In this example:

[0475]

[0476] For options (0), (1), and (2), one-bit in-phase reporting may be used. For option (3), four-bit in-phase reporting may be used. Fig.54 It is shown that a first portion 5410 may be used for rank 5 transmission, an extended portion 5412 may be used for rank 6 transmission, an additional extended portion 5414 may be used for rank 7 transmission, and a full set 5416 of pre-decoders may be used for rank 8 transmission. Although illustrated for the first option, the use of portions of rank-based pre-decoders may be similarly applied to 5404, 5406, and 5408.

[0477] The following table provides mapping of the first TPMI field for UL 8 Tx MIMO with rank greater than 4 (eg, rank 5, rank 6, rank 7, or rank 8).

[0478] In some aspects, 4-6-7-8 bits are shown for codebook subset restrictions NC, NC / PC-2, NC / PC-2 / PC-4, and NC / PC-2 / PC-4 / FC. As illustrated, for rank 7 and 8 fully coherent (FC) codebooks, four precoders are used for each.

[0479]

[0480]

[0481] The following table illustrates the bit mapping of the second TPMI field for 8Tx rank 1-8 UL MIMO transmission, for example, when the maximum rank > 4 (e.g., maximum rank = 5, 6, 7, or 8). The mapping has the same number of layers indicated by the first TPMI field. For rank 7-8 fully coherent codebooks, four pre-decoders are used.

[0482]

[0483]

[0484] The following table illustrates another example, i.e., the bit field mapping of the first TPMI field for UL 8Tx MIMO when maximum rank>4 (maximum rank=5, 6, 7, or 8). In this example, bits 4-6-7-8 are used for codebook subset restrictions NC, NC / PC-2, NC / PC-2 / PC-4, and NC / PC-2 / PC-4 / FC. For rank 7-8 fully coherent codebooks, eight pre-decoders can be used.

[0485]

[0486]

[0487] The following table illustrates the bit mapping of the second TPMI field for 8Tx rank 1-8 UL MIMO transmission, for example, when the maximum rank>4 (e.g., maximum rank=5, 6, 7, or 8). The mapping has the same number of layers as indicated by the first TPMI field in the table above, for example. For rank 7-8 fully coherent codebooks, eight pre-decoders are used.

[0488]

[0489]

[0490] Different types of devices may have different antenna layouts to support 8Tx. For example, a UE may have a different antenna layout than an indoor customer premises equipment (CPE). Due to coherence capabilities, 8Tx antennas may be configured with multiple groups. Various aspects presented herein facilitate implementation of more antenna port configurations for UL 8Tx transmissions (such as 8Tx PUSCH transmissions). For example, 8Tx transmissions may be based on multiple antenna groups. The port numbers in each antenna group may be the same or may be different. In some aspects, the group number may be greater than 2. TPMI and RI indications may be based on active antenna groups.

[0491] Multiple layers of UL MIMO transmission may be transmitted using multiple subsets of coherent Tx. As an example, 8Tx may be based on a combination of two Tx subsets, such as 4Tx+4Tx. For example, 4Tx+4Tx may refer to a first set of four antenna ports and a second set of four antenna ports. Fig.55A An example is illustrated in which eight antenna ports of UE 5506 are grouped into a first group of four antennas 5502 and a second group of four antennas 5504. Transmissions from antenna ports in each subset of the eight antenna ports may be coherent, for example, transmissions within antenna group 5502 may be coherent, and transmissions within antenna group 5504 may be coherent. Multiple layers from rank 5 to rank 8 may be transmitted using different combinations of antenna port groups.

[0492] For example, for layer 1 sending, use Fig.55A For the 4Tx+4Tx antenna port grouping in 5500, 1 layer may be sent from one antenna port group (e.g., 5502), and layers may not be sent from other antenna port groups (e.g., 5504). Similarly, 1 layer may be sent from one antenna port group (e.g., 5504), and layers may not be sent from other antenna port groups (e.g., 5502). This option may be expressed as:

[0493] Layer 1: Layer 1->4Tx, Layer 0->4Tx

[0494] In the 2-layer example, 2 layers may be sent from one antenna port group and no layers may be sent from other antenna port groups, or 1 layer may be sent from each antenna port group. This example may be represented as:

[0495] 2 layers: 0th layer -> 4Tx, 2nd layer -> 4Tx; 1st layer -> 4Tx, 1st layer -> 4Tx

[0496] In the 3-layer example, 3 layers may be transmitted from one antenna port group and no layers may be transmitted from other antenna port groups, or 1 layer may be transmitted from one of the antenna port groups and 2 layers may be transmitted from other antenna port groups. This example may be represented as:

[0497] 3 layers: Layer 0->4Tx, Layer 3->4Tx; Layer 1->4Tx, Layer 2->4Tx

[0498] In the 4-layer example, 4 layers may be sent from one antenna port group and no layers may be sent from other antenna port groups, or 1 layer may be sent from one of the antenna port groups and 3 layers may be sent from other antenna port groups, or 2 layers may be sent from each antenna port group. This example may be represented as:

[0499] 4 layers: Layer 0->4Tx, Layer 4->4Tx; Layer 1->4Tx, Layer 3->4Tx; Layer 2->4Tx, Layer 2->4Tx

[0500] In the 5-layer example, 1 layer may be transmitted from one of the antenna port groups and 4 layers may be transmitted from the other antenna port groups, or 2 layers may be transmitted from one antenna port group and 3 layers may be transmitted from the other antenna port groups. This example may be represented as:

[0501] 5-layer: 1st layer -> 4Tx, 4th layer -> 4Tx; 2nd layer -> 4Tx, 3rd layer -> 4Tx

[0502] In the 6-layer example, 2 layers may be transmitted from one of the antenna port groups and 4 layers may be transmitted from the other antenna port groups, or 3 layers may be transmitted from each of the antenna port groups. This example may be represented as:

[0503] 6-layer: 2-layer -> 4Tx, 4-layer -> 4Tx; 3-layer -> 4Tx, 3-layer -> 4Tx

[0504] In the 7-layer example, 3 layers may be sent from one antenna port group and 4 layers may be sent from the other antenna port group. This example may be represented as:

[0505] 7-layer: 3-layer -> 4Tx, 4-layer -> 4Tx

[0506] In the 8-layer example, 4 layers may be sent from one antenna port group, and 4 layers may be sent from the other antenna port group. This example may be represented as:

[0507] 8 layers: 4 layers -> 4Tx, 4 layers -> 4Tx

[0508] Fig.55B Another example of antenna port grouping 5525 for a device with eight antenna ports is illustrated, where a first group of antenna ports 5508 has two antenna ports, a second group of antenna ports (e.g., 5512) has two antenna ports, and a third group of antenna ports (e.g., 5510) has four antenna ports. Fig.55A In the example of , multiple layers can be sent using multiple subsets of coherent Tx. Fig.55B In , 8Tx includes three Tx subsets, 2Tx+2Tx+4Tx. In each subset of antenna ports, the transmission is coherent. Multiple layers from rank 5 to rank 8 can be transmitted using various possible combinations of layers from different antenna groups.

[0509] 1 layer may be transmitted without transmitting a layer from one of two antenna groups (e.g., 5508 and 5512) and transmitting 1 layer from four antenna groups (e.g., 5510). Alternatively, 1 layer may be transmitted from one of two antenna groups (e.g., 5508 or 5512) instead of from four antenna groups. This example may be represented as:

[0510] Layer 1: Layer 0->2Tx, Layer 0->2Tx, Layer 1->4Tx; Layer 0->2Tx, Layer 1->2Tx, Layer 0->4Tx

[0511] 2 layers may be transmitted without transmitting a layer from one of the two antenna groups (e.g., 5508 and 5512) and 2 layers may be transmitted from the four antenna groups (e.g., 5510). Alternatively, 1 layer may be transmitted from one of the two antenna groups (e.g., 5508 or 5512) and 1 layer may be transmitted from the four antenna groups. Alternatively, 1 layer may be transmitted from each of the two antenna groups (e.g., 5508 or 5512) and a layer may not be transmitted from the four antenna groups (e.g., 5510). This example may be represented as:

[0512] 2 layers: 0 layers -> 2Tx, 0 layers -> 2Tx, 2 layers -> 4Tx; 0 layers -> 2Tx, 1 layers -> 2Tx, 1 layers -> 4Tx; 1 layers -> 2Tx, 1 layers

[0513] ->2Tx, 0th layer->4Tx

[0514] 3 layers may be transmitted without transmitting a layer from one of the two antenna groups (e.g., 5508 and 5512) and 3 layers may be transmitted from the four antenna groups (e.g., 5510). Alternatively, 1 layer may be transmitted from one of the two antenna groups (e.g., 5508 or 5512) and 2 layers may be transmitted from the four antenna groups. Alternatively, 1 layer may be transmitted from each of the antenna groups (e.g., 5508, 5512, and 5510). This example may be represented as:

[0515] 3 layers: 0th layer -> 2Tx, 0th layer -> 2Tx, 3rd layer -> 4Tx; 0th layer -> 2Tx, 1st layer -> 2Tx, 2nd layer -> 4Tx; 1st layer -> 2Tx, 1st layer

[0516] ->2Tx, 1 layer->4Tx

[0517] 4 layers may be transmitted without transmitting a layer from one of the two antenna groups (e.g., 5508 and 5512) and 4 layers may be transmitted from the four antenna groups (e.g., 5510). Alternatively, 1 layer may be transmitted from one of the two antenna groups (e.g., 5508 or 5512) and 3 layers may be transmitted from the four antenna groups. Alternatively, 1 layer may be transmitted from each of the two antenna groups (e.g., 5508 and 5512) and 2 layers may be transmitted from the four antenna groups 5510. This example may be represented as:

[0518] 4 layers: 0th layer -> 2Tx, 0th layer -> 2Tx, 4th layer -> 4Tx; 0th layer -> 2Tx, 1st layer -> 2Tx, 3rd layer -> 4Tx; 1st layer -> 2Tx, 1st layer

[0519] ->2Tx, 2 layers->4Tx

[0520] 5 layers may be transmitted when 1 layer is transmitted from one of the two antenna groups (e.g., 5508 or 5512) and 4 layers are transmitted from the four antenna groups (e.g., 5510). Alternatively, 1 layer may be transmitted from each of the two antenna groups (e.g., 5508 and 5512), and 3 layers may be transmitted from the four antenna groups 5510. Alternatively, 1 layer may be transmitted from one of the two antenna groups (e.g., 5508), 2 layers may be transmitted from the other two antenna groups (e.g., 5512), and 2 layers may be transmitted from the four antenna groups 5510. This example may be represented as:

[0521] 5 layers: 0th layer -> 2Tx, 1st layer -> 2Tx, 4th layer -> 4Tx; 1st layer -> 2Tx, 1st layer -> 2Tx, 3rd layer -> 4Tx; 1st layer -> 2Tx, 2nd layer

[0522] ->2Tx, 2 layers->4Tx

[0523] 6 layers may be transmitted when 2 layers are transmitted from one of the two antenna groups (e.g., 5508 or 5512) and 4 layers are transmitted from the four antenna groups (e.g., 5510). Alternatively, 1 layer may be transmitted from each of the two antenna groups (e.g., 5508 and 5512), and 4 layers may be transmitted from the four antenna groups 5510. Alternatively, 2 layers may be transmitted from each of the two antenna groups (e.g., 5508 and 5512), and 2 layers may be transmitted from the four antenna groups 5510. This example may be represented as:

[0524] 6 layers: 0th layer -> 2Tx, 2nd layer -> 2Tx, 4th layer -> 4Tx; 1st layer -> 2Tx, 1st layer -> 2Tx, 4th layer -> 4Tx; 2nd layer -> 2Tx, 2nd layer

[0525] ->2Tx, 2 layers->4Tx

[0526] A 7-layer transmission may be sent using 1 layer sent from one of two antenna groups (e.g., 5508), 2 layers sent from another two antenna groups 5512, and 4 layers sent from four antenna groups 5510. This example may be represented as:

[0527] 7 layers: 1 layer -> 2Tx, 2 layers -> 2Tx, 4 layers -> 4Tx

[0528] An 8-layer transmission may be sent using 2 layers sent from each of two antenna groups (e.g., 5508 and 5512) and 4 layers sent from four antenna groups 5510. This example may be represented as:

[0529] 8 layers: 2 layers -> 2Tx, 2 layers -> 2Tx, 4 layers -> 4Tx

[0530] Fig.55C Another example of antenna port grouping 5550 for a device having eight antenna ports is illustrated, which are divided into four groups of two antenna ports, for example, 5514, 5516, 5518, and 5520. Similar to Fig.55A and Fig.55B In the example in , multiple layers can be sent using multiple subsets of coherent Tx. 8Tx may include three Tx subsets, 2Tx+2Tx+2Tx+2Tx. In each subset of antenna ports, the transmission is coherent. Multiple layers from rank 5 to rank 8 can be sent using various possible combinations of layers from different antenna groups.

[0531] 1 layer transmission may be transmitted using 1 layer transmitted from one of the four antenna groups. This example may be represented as:

[0532] Layer 1: Layer 0->2Tx, Layer 0->2Tx, Layer 0->2Tx, Layer 1->2Tx

[0533] A 2-layer transmission may be transmitted using 2 layers transmitted from one of the four antenna groups, or using 1 layer transmitted from the first group and 1 layer transmitted from the second group. This example may be represented as:

[0534] 2 layers: 0th layer -> 2Tx, 0th layer -> 2Tx, 1st layer -> 2Tx, 1st layer -> 2Tx

[0535] A 3-layer transmission may be sent with 1 layer sent from the first group, 1 layer sent from the second group, and 1 layer sent from the third group. This example may be represented as:

[0536] 3 layers: 0th layer -> 2Tx, 1st layer -> 2Tx, 1st layer -> 2Tx, 1st layer -> 2Tx

[0537] A 4-layer transmission may be sent using 1 layer transmitted from each of the antenna groups. This example may be represented as:

[0538] 4 layers: 1 layer -> 2Tx, 1 layer -> 2Tx, 1 layer -> 2Tx, 1 layer -> 2Tx;

[0539] A 5-layer transmission may be sent using 1 layer sent from the first group, 2 layers sent from the second group, and 2 layers sent from the third group. Alternatively, a 5-layer transmission may be sent using 1 layer from the first, second, and third groups, and 2 layers sent from the fourth group. This example may be represented as:

[0540] 5 layers: 0th layer->2Tx, 1st layer->2Tx, 2nd layer->2Tx, 2nd layer->2Tx; 1st layer->2Tx, 1st layer->2Tx, 1st layer->2Tx, 2nd layer->2Tx

[0541] A 6-layer transmission may be sent using 2 layers sent from the first group, 2 layers sent from the second group, and 2 layers sent from the third group. Alternatively, a 5-layer transmission may be sent using 1 layer from the first group, 1 layer from the second group, 2 layers from the third group, and 2 layers sent from the fourth group. This example may be represented as:

[0542] 6 layers: 0th layer->2Tx, 2nd layer->2Tx, 2nd layer->2Tx, 2nd layer->2Tx; 1st layer->2Tx, 1st layer->2Tx, 2nd layer->2Tx, 2nd layer->2Tx

[0543] A 7-layer transmission may be sent using 1 layer sent from the first group, 2 layers sent from the second group, 2 layers sent from the third group, and 2 layers sent from the fourth group. This example may be represented as:

[0544] 7 layers: 1 layer->2Tx, 2 layers->2Tx, 2 layers->2Tx, 2 layers->2Tx;

[0545] An 8-layer transmission may be sent using 2 layers sent from the first group, 2 layers sent from the second group, 2 layers sent from the third group, and 2 layers sent from the fourth group. This example may be represented as:

[0546] 8 layers: 2 layers -> 2Tx, 2 layers -> 2Tx, 2 layers -> 2Tx, 2 layers -> 2Tx;

[0547] In some aspects, multiple layers may be transmitted using multiple subsets of coherent transmission. In some aspects, 8Tx may include mixed partially coherent transmission and non-coherent transmission. For example, 8Tx = 1Tx + 1Tx + 2Tx + 4Tx. Various combinations of antenna groups may be used to transmit multiple layers from rank 5 to rank 8.

[0548] 1 layer transmission may be transmitted using 1 layer transmitted from one of two antenna port groups. This example may be represented as:

[0549] Layer 1: Layer 0->2Tx, Layer 0->2Tx, Layer 0->2Tx, Layer 1->2Tx; Layer 0->2Tx, Layer 0->2Tx, Layer 1->2Tx, Layer 0

[0550] ->2Tx; 0th layer->2Tx, 1st layer->2Tx, 0th layer->2Tx, 0th layer->2Tx;

[0551] A 2-layer transmission may be sent using 2 layers transmitted from one of two antenna port groups. This example may be represented as:

[0552] 2 layers: 0th layer->2Tx, 0th layer->2Tx, 0th layer->2Tx, 2nd layer->2Tx;

[0553] A 3-layer transmission may be sent using 1 layer sent from one of the two antenna port groups and 2 layers sent from the other of the two antenna port groups. This example may be represented as:

[0554] 3 layers: 0th layer->2Tx, 0th layer->2Tx, 1st layer->2Tx, 2nd layer->2Tx;

[0555] A 4-layer transmission may be transmitted using 1 layer transmitted from a first two-antenna port group, 1 layer transmitted from a second two-antenna port group, and 2 layers transmitted from a third two-antenna port group. This example may be represented as:

[0556] 4 layers: 0th layer -> 2Tx, 1st layer -> 2Tx, 1st layer -> 2Tx, 2nd layer -> 2Tx

[0557] A 5-layer transmission may be transmitted using 1 layer transmitted from two antenna ports and four layers transmitted from another antenna port group. Alternatively, 2 layers may be transmitted from the two antenna port group, and three layers may be transmitted from the four antenna port group. Alternatively, 1 layer may be transmitted from the first two antenna port group, 1 layer may be transmitted from the second antenna port group, and 3 layers may be transmitted from the third antenna port group. Alternatively, a 5-layer transmission may be transmitted using 1 layer transmitted from the first two antenna port group, 1 layer transmitted from the second two antenna port group, 1 layer transmitted from the third two antenna ports, and 2 layers transmitted from the fourth two antenna port group. This example may be represented as:

[0558] 5 layers: 0th layer -> 2Tx, 0th layer -> 2Tx, 1st layer -> 2Tx, 4th layer -> 2Tx; 0th layer -> 2Tx, 0th layer -> 2Tx, 2nd layer -> 2Tx, 3rd layer

[0559] ->2Tx; 0th layer->2Tx, 1st layer->2Tx, 1st layer->2Tx, 3rd layer->2Tx; 0th layer->2Tx, 1st layer->2Tx, 2nd layer->2Tx, 2nd layer

[0560] ->2Tx; 1st layer->2Tx, 1st layer->2Tx, 1st layer->2Tx, 2nd layer->2Tx;

[0561] A 6-layer transmission may be transmitted using 2 layers transmitted from two antenna ports and four layers transmitted from another antenna port group. Alternatively, 1 layer may be transmitted from the first two antenna port group, 1 layer may be transmitted from the second antenna port group, and 4 layers may be transmitted from the third antenna port group. Alternatively, 1 layer may be transmitted from the first two antenna port group, 2 layers may be transmitted from the second antenna port group, and 3 layers may be transmitted from the third antenna port group. Alternatively, a 5-layer transmission may be transmitted using 1 layer transmitted from the first two antenna port group, 1 layer transmitted from the second two antenna port group, 1 layer transmitted from the third two antenna ports, and 3 layers transmitted from the fourth two antenna port group. Alternatively, a 5-layer transmission may be transmitted using 1 layer transmitted from the first two antenna port group, 1 layer transmitted from the second two antenna port group, 2 layers transmitted from the third two antenna ports, and 2 layers transmitted from the fourth two antenna port group. This example may be represented as:

[0562] 6 layers: 0th layer -> 2Tx, 0th layer -> 2Tx, 2nd layer -> 2Tx, 4th layer -> 2Tx; 0th layer -> 2Tx, 1st layer -> 2Tx, 1st layer -> 2Tx, 4th layer

[0563] ->2Tx; Layer 0->2Tx, Layer 1->2Tx, Layer 2->2Tx, Layer 3->2Tx; Layer 1->2Tx, Layer 1->2Tx, Layer 1->2Tx, Layer 3

[0564] ->2Tx; 1st layer->2Tx, 1st layer->2Tx, 2nd layer->2Tx, 2nd layer->2Tx;

[0565] As an example, 7 layers of transmission may be transmitted using 1 layer transmitted from the first two antenna port group, 1 layer transmitted from the second two antenna port group, and 4 layers transmitted from the third two antenna ports. Alternatively, 1 layer may be transmitted from the two antenna port group, 1 layer may be transmitted from the second two antenna port group, 2 layers may be transmitted from the third two antenna port group, and 3 layers may be transmitted from the fourth two antenna port group. This example may be represented as:

[0566] 7 layers: 0th layer -> 2Tx, 1st layer -> 2Tx, 2nd layer -> 2Tx, 4th layer -> 2Tx; 1st layer -> 2Tx, 1st layer -> 2Tx, 2nd layer -> 2Tx, 3rd layer

[0567] ->2Tx;

[0568] As an example, 8 layers of transmission may be transmitted using 1 layer transmitted from the first two antenna port group, 1 layer transmitted from the second two antenna port group, 2 layers transmitted from the third two antenna port group, and 4 layers transmitted from the fourth two antenna port group. Alternatively, 1 layer may be transmitted from the two antenna port group, 1 layer may be transmitted from the second two antenna port group, 2 layers may be transmitted from the third two antenna port group, and 3 layers may be transmitted from the fourth two antenna port group. This example may be represented as:

[0569] 8 layers: 1 layer -> 2Tx, 1 layer -> 2Tx, 2 layers -> 2Tx, 4 layers -> 2Tx;

[0570] In some aspects, the UE may utilize multiple coherent antenna subsets to receive the two-stage indication of TPMI and RI. Fig.55E An example communication flow between a UE 5506 and a network node 5522, such as a base station, is illustrated. As a first stage, at 5524, the network may indicate which antenna groups are active. The field size of the indication may be equal to the number of antenna groups. After indicating the active antenna groups, at 5526, the network may send a TPMI and RI for each of the active antenna groups. The network may skip providing the UE with a TPMI or RI indication for inactive antenna groups.

[0571] For example, for Fig.55CThe grouping options shown, such as 8Tx=2Tx+2Tx+4Tx, for a total rank of 5, and 0 layers->2Tx, 2 layers->2Tx, 3 layers->2Tx configurations, for the first stage, for example at 5524, the network can use 3 bits to indicate antenna group activity. As an example, "0 1 1" indicates that the last two antenna groups are active and the first antenna group is inactive. Then, at the second stage, 3 bits can indicate the TPMI and RI for the second antenna group, and 6 bits can indicate the TPMI and RI for the third antenna group. Fig.55D An example table 5575 showing an example bit field mapping for 2-port TPMI is illustrated. The following table shows example bit fields for 4-port TPMI.

[0572]

[0573]

[0574] In some aspects, to reduce TPMI overhead, the bit width of the precoding information and layer number fields can be reduced. For example, the precoding information and layer number fields for 8Tx can have a reduced bit width relative to such fields for 4Tx. As an example, TPMIs corresponding to antenna ports (e.g., Tx ports) in a subset of coherent transmit ports can be included.

[0575] In some aspects, the precoder for each antenna group may reuse a 2-port precoder or a 4-port precoder or a subset of the codebook for 2Tx or 4Tx, rather than having a separate precoder for 8Tx. The precoder in each antenna group may be scaled by a factor such as Where N G is the port number in the antenna group.

[0576] For example, for Fig.55C For a grouping option in, for example, 8Tx=2Tx+2Tx+4Tx, the scaling factor to be applied to the transmission of the first set of two antenna ports 5508 and the second set of two antenna ports (e.g., 5512) will be (For example, 8 / N G is 4) and the scaling factor for a four-antenna port group (e.g., 5510) would be An example pre-decoder for a two-antenna port group (e.g., 5508) may be An example pre-decoder for a four-antenna port group (e.g., 5510) may be

[0577] In some aspects, the UE may indicate the coherence assumption to the network. Fig.55E, UE 5506 may send an indication of the coherence assumption at 5523. In some aspects, the UE may indicate the coherence assumption in a report of UE capabilities, for example, the UE may indicate that it supports the coherence assumption capability.

[0578] In some aspects, the SRS configuration for UL codebook-based PUSCH transmissions may be based on antenna port groups. In some aspects, ports from different antenna groups may be configured in one SRS resource, and each port may be distinguished using different cyclic shifts and different comb indices. Fig.56A Diagram 5600 illustrates SRS resources 5606 configured for antenna port 5608 from antenna port group 1 5602 and also configured for antenna port 5610 from antenna port group 2 5604. In some aspects, ports from different antenna groups may be respectively configured with different SRS resources. Fig.56B Diagram 5650 illustrates SRS resources 5612 configured individually for antenna ports from antenna port group 1 5602 and SRS resources 5614 configured for antenna ports from antenna port group 2 5604. This may enable greater transmit power per antenna port than ports from different antenna groups being configured in one SRS resource.

[0579] Fig.57A 5700 is a flow chart of a method of wireless communication. The method may be performed by a UE (eg, UE 104, 350; device 5904). The method may enable the UE to send UL MIMO transmissions using various precoding options for 8Tx.

[0580] At 5704, the UE receives control signaling for uplink MIMO transmission, the control signaling including the first TPMI field and the second TPMI field and the SRS resource set indicator. The reception can be performed, for example, by the codebook processing component 198, the transceiver 5922 and / or the antenna 5980. The codebook processing component 198 can be a component of the UE 104, 350 or the device 5904.

[0581] At 5708, the UE transmits an uplink MIMO transmission precoded with an 8-port uplink MIMO precoder based on a 4-port uplink MIMO codebook with a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator. The transmission may be performed, for example, by the codebook processing component 198, the transceiver 5922, and / or the antenna 5980. The codebook processing component 198 may be a component of the UE 104, 350, or the device 5904. The transmission may be based on a combination of Figures 4 to 62 Any of the described aspects are pre-coded.

[0582] Fig.57B 5750 is a flow chart of a method of wireless communication. The method may be performed by a UE (eg, UE 104, 350; device 5904). The method may enable the UE to send UL MIMO transmissions using various precoding options for 8Tx.

[0583] At 5704, the UE receives control signaling for uplink MIMO transmission, the control signaling including the first TPMI field and the second TPMI field and the SRS resource set indicator. The reception can be performed, for example, by the codebook processing component 198, the transceiver 5922 and / or the antenna 5980. The codebook processing component 198 can be a component of the UE 104, 350 or the device 5904.

[0584] At 5708, the UE transmits an uplink MIMO transmission precoded with an 8-port uplink MIMO precoder based on a 4-port uplink MIMO codebook with a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator. The transmission may be performed, for example, by the codebook processing component 198, the transceiver 5922, and / or the antenna 5980. The codebook processing component 198 may be a component of the UE 104, 350, or the device 5904. The transmission may be based on a combination of Figures 4 to 62 Any of the described aspects are pre-coded.

[0585] In some aspects, at 5706, the UE may construct an 8-port precoding matrix based on a 4-port uplink MIMO codebook and a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator. The construction may be performed, for example, by the codebook processing component 198. The codebook processing component 198 may be a component of the UE 104, 350, or the device 5904.

[0586] The SRS resource set indicator may indicate a precoding matrix type, and a mapping from a 4-port uplink MIMO codebook to an 8-port precoding matrix may be indicated by a combination of the SRS resource set indicator, the first TPMI field, and the second TPMI field. The first TPMI field may indicate a first rank and a first precoding matrix indication, and the second TPMI field may indicate a second precoding matrix indication, the second rank being based on the first rank indicated in the first TPMI field and the precoding matrix type indicated by the SRS resource set indicator. In some aspects, the control signaling may also include: a first SRI indicating a first SRS resource associated with the first TPMI field; and a second SRI indicating a second SRS resource associated with the second TPMI field.

[0587] In some aspects, the control signaling may also include a first SRI and a second SRI, and the mapping from the 4-port uplink MIMO codebook to the 8-port precoding matrix is ​​indicated by a combination of an SRS resource set indicator, a first TPMI field, a second TPMI field, and a second SRI. The first SRI may indicate an SRS resource, and the second SRI indicates a precoding matrix type. In some aspects, the precoding matrix type may be jointly indicated by the second SRI and the SRS resource set indicator. In some aspects, the first TPMI field indicates a first rank and a first precoding matrix indication, and the second TPMI field indicates a second precoding matrix indication, the second rank being based on the first rank indicated in the first TPMI field, the SRS resource set indicator, and the second SRI.

[0588] In some aspects, the control signaling may also include at least one SRI, and the SRS resource set indicator at least partially indicates the precoding matrix type, and the mapping from the 4-port uplink MIMO codebook to the 8-port precoding matrix is ​​indicated by at least the combination of the SRS resource set indicator, the first TPMI field, and the second TPMI field. The first TPMI field and the second TPMI field may independently indicate the first precoding matrix and the second precoding matrix. The first TPMI field may indicate the first rank and the first precoding matrix, and the second TPMI field indicates the second rank and the second precoding matrix. The SRS resource set indicator may indicate a precoding matrix type independent of the second SRI. The SRS resource set indicator may indicate the precoding matrix type jointly with the second SRI, and the first SRI indicates resources associated with the first precoding matrix and the second precoding matrix.

[0589] As illustrated at 5702, in some aspects, the UE may receive a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, wherein a first precoding matrix indicated by a first TPMI field is applied to the first antenna port group and a second precoding matrix indicated by a second TPMI field is applied to the second antenna port group. The receiving may be performed, for example, by a codebook processing component 198, a transceiver 5922, and / or an antenna 5980. The codebook processing component 198 may be a component of the UE 104, 350, or the device 5904. The control signaling may include a precoding matrix type indicator, at least one SRI indicating SRS resources for the first precoding matrix and the second precoding matrix, and a mapping from a 4-port uplink MIMO codebook to an 8-port precoding matrix is ​​indicated by at least the precoding matrix type indicator, the first TPMI field, and the second TPMI field. In some aspects, the control signaling may also include an additional bit indicating the precoding matrix type in combination with the precoding matrix type indicator, and the mapping from the 4-port uplink MIMO codebook to the 8-port precoding matrix is ​​further based on the additional bit. In some aspects, the first antenna port group and the second antenna port group are indicated to the UE in a permutation matrix.

[0590] In some aspects, the control signaling may also include a codebook subset indicator, the codebook subset indicator including at least one additional bit and indicating a subset from a set of codebook subsets including full coherent transmission, partial coherent transmission, or non-coherent transmission. A first value of the codebook subset indicator may correspond to partial coherent transmission or non-coherent transmission and indicate an 8-port uplink MIMO codebook constructed based on a 4-port uplink MIMO codebook, and a second value of the codebook subset indicator may correspond to full coherent transmission using a precoding matrix that is not based on a 4-port uplink MIMO codebook and is jointly indicated by the first TPMI field and the second TPMI field.

[0591] In some aspects, the control signaling may also include: a first SRS resource indicator (SRI) indicating an SRS resource; and a second SRI indicating a subset from a set of codebook subsets including full coherent transmission, partial coherent transmission, or non-coherent transmission. In some aspects, the first value of the second SRI corresponds to partial coherent transmission or non-coherent transmission, and indicates an 8-port uplink MIMO codebook constructed based on a 4-port uplink MIMO codebook, and the second value of the second SRI corresponds to full coherent transmission using a precoding matrix having all non-zero entries and jointly indicated by the first TPMI field and the second TPMI field.

[0592] In some aspects, the SRS resource set indicator indicates a subset from a set of codebook subsets including fully coherent transmission, partially coherent transmission, or non-coherent transmission. In some aspects, the first three values ​​of the SRS resource set indicator correspond to partially coherent transmission or non-coherent transmission and indicate an 8-port uplink MIMO codebook constructed based on a 4-port uplink MIMO codebook, and the fourth value of the SRS resource set indicator corresponds to fully coherent transmission using a precoding matrix having all non-zero entries and indicated jointly by the first TPMI field and the second TPMI field.

[0593] In some aspects, a rank-1 8-port uplink MIMO predecoder is based on a rank-1 precoding matrix and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO predecoder is indicated by one of the following: a single-bit port group indicator and a single TPMI field having four states indicating a non-coherent predecoder, a single-bit port group indicator and a single TPMI field having eight states indicating a two-antenna partially coherent predecoder (PC-2), or a single-bit port group indicator and a single TPMI field having sixteen states indicating a four-antenna partially coherent predecoder (PC-4).

[0594] In some aspects, a rank 2 precoding matrix is ​​applied to rank 2 8-port uplink MIMO precoding of a first antenna port group having four antenna ports or a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a single bit port group indicator and a single TPMI field with six states indicating a non-coherent precoder or a single bit port group indicator and a single TPMI field with eight states for a two-antenna partially coherent precoder (PC-2) or a four-antenna partially coherent precoder (PC-4).

[0595] In some aspects, an 8-port uplink MIMO precoder of rank 2 is based on a first rank 1 precoding matrix applied to a first antenna port group having four antenna ports and a second rank 1 precoding matrix applied to a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a first TPMI field and a second TPMI field, each TPMI field having four states indicating a non-coherent precoder; a first TPMI field and a second TPMI field, each TPMI field having eight states indicating a two-antenna partially coherent precoder (PC-2); a first TPMI field and a second TPMI field, each TPMI field having sixteen states indicating a four-antenna partially coherent precoder (PC-4); or a single TPMI field in combination with the use of the same precoder for both the first antenna port group and the second antenna port group.

[0596] In some aspects, a rank 2 8-port uplink MIMO predecoder and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO predecoder is indicated by one of the following: a two-bit port group indicator and a single TPMI field having six states indicating a non-coherent predecoder based on a single rank 2 precoding matrix applied to the first antenna port group or the second antenna port group; a two-bit port group indicator and a single TPMI field having eight states for a two-antenna partially coherent predecoder (PC-2) or a four-antenna partially coherent predecoder (PC-4) based on a single rank 2 precoding matrix applied to the first antenna port group or the second antenna port group; a two-bit port group indicator, A first TPMI field and a second TPMI field, each TPMI field having four states indicating a non-coherent predecoder based on two rank-1 precoding matrices applied to a first antenna port group or a second antenna port group; a two-bit port group indicator, a first TPMI field and a second TPMI field, each TPMI field having eight states indicating a two-antenna partially correlated predecoder (PC-2) based on two rank-1 precoding matrices applied to the first antenna port group or the second antenna port group; or a two-bit port group indicator, a first TPMI field and a second TPMI field, each TPMI field having sixteen states indicating a four-antenna partially correlated predecoder (PC-4) based on two rank-1 precoding matrices applied to the first antenna port group or the second antenna port group.

[0597] In some aspects, an 8-port uplink MIMO predecoder of rank 2, wherein the rank 2 predecoder is applied to a first antenna port group or a second antenna port group, or the same rank 1 predecoder is applied to both the first antenna port group and the second antenna port group, the 8-port uplink MIMO predecoder is indicated by one of the following: a two-bit port group indicator and a single TPMI field with 6 states indicating a non-coherent predecoder based on the rank 2 predecoder applied to the first antenna port group or the second antenna port group; a two-bit port group indicator and a two-antenna partially coherent predecoder (PC-2) or a four-antenna partially coherent predecoder (PC-4) with 8 states for applying a single rank 2 predecoder to the first antenna port group or the second antenna port group a single TPMI field having eight states indicating non-coherent predecoder states for a two-antenna partially-coherent predecoder (PC-2), wherein the same rank-1 predecoder is applied to both the first antenna port group and the second antenna port group; a two-bit port group indicator and a single TPMI field having eight states for a two-antenna partially-coherent predecoder (PC-2), wherein the same rank-1 predecoder is applied to both the first antenna port group and the second antenna port group; or a two-bit port group indicator and a single TPMI field having sixteen states indicating a four-antenna partially-coherent predecoder (PC-4), wherein the same rank-1 predecoder is applied to both the first antenna port group and the second antenna port group.

[0598] In some aspects, a rank 3 8-port uplink MIMO predecoder and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO predecoder is indicated by one of the following: a single bit port group indicator and a single TPMI field having a single state indicating that a single rank 3 precoding matrix is ​​applied to a non-coherent predecoder of the first antenna port group or the second antenna port group; a single bit port group indicator and a single TPMI field having two states for applying a single rank 3 precoding matrix to a two-antenna partially coherent predecoder (PC-2) of the first antenna port group or the second antenna port group; a single bit port group The first TPMI field has an indicator and a single TPMI field with four states for applying a single rank-3 precoding matrix to a four-antenna partially correlated precoder (PC-4) for the first antenna port group or the second antenna port group; a first TPMI field with six states and a second TPMI field with four states indicating that a rank-2 precoding matrix is ​​applied to the first antenna port group and a rank-1 precoding matrix is ​​applied to the second antenna port group for a non-correlated precoder; a first TPMI field with eight states and a second TPMI field with eight states indicating that a rank-2 precoding matrix is ​​applied to the first antenna port group and a rank-1 precoding matrix is ​​applied to the second antenna port group for a two-antenna partially correlated precoder (PC-2) segment; a first TPMI field having eight states and a second TPMI field having sixteen states indicating that a rank-2 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a second antenna port group for a four-antenna partially phased precoder (PC-4); a first TPMI field having four states and a second TPMI field having six states indicating that a rank-2 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a non-phased precoder for a second antenna port group; a first TPMI field having sixteen states and a four-antenna partially phased precoder having six states indicating that a rank-2 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a second antenna port group a second TPMI field having eight states for a phase-separated precoder (PC-4); a two-bit port group indicator and a single TPMI field having a single state for a non-phased precoder indicating that a single rank-3 precoding matrix is ​​applied to a first antenna port group or a second antenna port group; a two-bit port group indicator and a single TPMI field having two states for a two-antenna partially phased precoder (PC-2) indicating that a single rank-3 precoding matrix is ​​applied to a first antenna port group or a second antenna port group; a two-bit port group indicator and a single TPMI field having four states for a four-antenna partially phased precoder (PC-4) indicating that a single rank-3 precoding matrix is ​​applied to a first antenna port group or a second antenna port group;A two-bit port group indicator, a first TPMI field with six states, and a second TPMI field with four states indicating that a rank-2 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a non-coherent precoder for a second antenna port group; a two-bit port group indicator, a first TPMI field with eight states, and a second TPMI field with eight states indicating that a rank-2 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a two-antenna partially correlated precoder (PC-2) for a second antenna port group; a two-bit port group indicator, a first TPMI field with eight states, and a second TPMI field with eight states indicating that a rank-2 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a second antenna port group A two-bit port group indicator, a first TPMI field with sixteen states indicating that a rank-2 precoding matrix is ​​applied to the first antenna port group and a rank-1 precoding matrix is ​​applied to the second antenna port group; a two-bit port group indicator, a first TPMI field with four states and a second TPMI field with six states indicating that a rank-2 precoding matrix is ​​applied to the first antenna port group and a rank-1 precoding matrix is ​​applied to the second antenna port group; or a two-bit port group indicator, a first TPMI field with sixteen states and a second TPMI field with eight states indicating that a rank-2 precoding matrix is ​​applied to the first antenna port group and a rank-1 precoding matrix is ​​applied to the second antenna port group. ;

[0599] In some aspects, a rank 3 8-port uplink MIMO predecoder and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports have a relationship between a precoding matrix applied to the first antenna port group and a precoding matrix applied to the second antenna port group, wherein the 8-port uplink MIMO predecoder is indicated by a two-bit port group indicator and one of the following: a single TPMI field with a single state indicating that a rank 3 precoding matrix is ​​applied to the first antenna port group or the second antenna port group; a two-antenna partially-coherent predecoder (P2PMI field) with a single state indicating that a rank 3 precoding matrix is ​​applied to the first antenna port group or the second antenna port group. a single TPMI field with two states indicating that the rank-3 precoding matrix is ​​applied to the first antenna port group or the second antenna port group for a four-antenna partially phased precoder (PC-4); a single TPMI field with six states indicating that the rank-2 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to the second antenna port group for a non-phased precoder; or a single TPMI field with eight states indicating that the rank-2 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to the second antenna port group for a two-antenna partially phased precoder (PC-2) or a four-antenna partially phased precoder (PC-4) .

[0600] In some aspects, a configuration of an 8-port uplink MIMO precoder of rank 4 and a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO precoder is indicated by one of: a single bit port group indicator and a single TPMI field with a single state indicating that a rank 4 precoding matrix is ​​applied to the first antenna port group or the second antenna port group; a single bit port group indicator and a two-antenna partially correlated precoder (PC-2) with a single state indicating that a rank 4 precoding matrix is ​​applied to the first antenna port group or the second antenna port group a single TPMI field having two states for applying a rank-4 precoding matrix to the first antenna port group or the second antenna port group; a first TPMI field and a second TPMI field having six states for applying a first rank-2 precoding matrix to the first antenna port group and a second rank-2 precoding matrix to the second antenna port group; a single TPMI field having two states for applying a rank-4 precoding matrix to the first antenna port group or the second antenna port group; a first TPMI field and a second TPMI field each having six states for applying a first rank-2 precoding matrix to the first antenna port group and a second rank-2 precoding matrix to the second antenna port group; a single TPMI field having two states for applying a rank-4 precoding matrix to the first antenna port group and a non-coherent precoding matrix to the second antenna port group; a single TPMI field having two states for applying a rank-2 ... second rank-2 precoding matrix to the second antenna port group a first TPMI field and a second TPMI field with eight states of a two-antenna partially phased predecoder (PC-2) or a four-antenna partially phased predecoder (PC-4) for a group of antenna ports; a two-bit port group indicator and a single TPMI field with a single state indicating that a rank-4 precoding matrix is ​​applied to a non-phased predecoder of the first antenna port group or the second antenna port group; a two-bit port group indicator and a single TPMI field with two states indicating that a rank-4 precoding matrix is ​​applied to a two-antenna partially phased predecoder (PC-2) or a four-antenna partially phased predecoder (PC-4) for the first antenna port group or the second antenna port group; two A two-bit port group indicator, a first TPMI field and a second TPMI field, each having six states indicating a non-coherent predecoder that applies a first rank-2 precoding matrix to a first antenna port group and a second rank-2 precoding matrix to a second antenna port group; or a two-bit port group indicator, a first TPMI field with eight states and a second TPMI field with eight states, which indicate a two-antenna partially phased predecoder (PC-2) or a four-antenna partially phased predecoder (PC-4) that applies a first rank-2 precoding matrix to a first antenna port group and a second rank-2 precoding matrix to a second antenna port group.

[0601] In some aspects, an 8-port uplink MIMO precoder of rank 4 and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, having a relationship between a precoding matrix applied to the first antenna port group and a precoding matrix applied to the second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by a two-bit port group indicator and one of the following: a single TPMI field with a single state indicating that a rank 4 precoding matrix is ​​applied to the first antenna port group or the second antenna port group; a two-antenna partially correlated precoder (PC-2) with a single state indicating that a rank 4 precoding matrix is ​​applied to the first antenna port group or the second antenna port group a single TPMI field with two states indicating that a rank-4 precoding matrix is ​​applied to a first antenna port group or a second antenna port group for a four-antenna partially phased precoder (PC-4); a single TPMI field with six states indicating that a first rank-2 precoding matrix is ​​applied to the first antenna port group and a second rank-2 precoding matrix is ​​applied to a non-phased precoder for the second antenna port group; or a single TPMI field with eight states indicating that a first rank-2 precoding matrix is ​​applied to the first antenna port group and a second rank-2 precoding matrix is ​​applied to the second antenna port group for a two-antenna partially phased precoder (PC-2) or a four-antenna partially phased precoder (PC-4) .

[0602] In some aspects, a rank 5 8-port uplink MIMO precoder and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, with a relationship between a precoding matrix applied to the first antenna port group and a precoding matrix applied to the second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a one-bit port group indicator and a single TPMI word having a single state of non-coherent precoders indicating that a rank 3 precoding matrix is ​​applied to the first antenna port group and a rank 2 precoding matrix is ​​applied to the second antenna port group or a rank 4 precoding matrix is ​​applied to the first antenna port group and a rank 1 precoding matrix is ​​applied to the second antenna port group a single TPMI field having two states indicating that a rank-3 precoding matrix is ​​applied to a first antenna port group and a rank-2 precoding matrix is ​​applied to a second antenna port group, or that a rank-4 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a second antenna port group; a single TPMI field having four states indicating that a rank-3 precoding matrix is ​​applied to a first antenna port group and a rank-2 precoding matrix is ​​applied to a second antenna port group, or that a rank-4 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a second antenna port group field; a one-bit port group indicator and a first TPMI field with 1 state and a second TPMI field with 1 state, which states indicate a non-coherent predecoder that applies a rank-3 precoding matrix to a first antenna port group and a rank-2 precoding matrix to a second antenna port group; a one-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 2 states, which states indicate a two-antenna partially correlated predecoder (PC-2) that applies a rank-3 precoding matrix to a first antenna port group and a rank-2 precoding matrix to a second antenna port group or a rank-4 precoding matrix to a first antenna port group and a rank-1 precoding matrix to a second antenna port group; a one-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 2 states, which states indicate a two-antenna partially correlated predecoder (PC-2) that applies a rank-3 precoding matrix to a first antenna port group and a rank-2 precoding matrix to a second antenna port group; A port group indicator and a first TPMI field with 4 states and a second TPMI field with 4 states, which indicate a four-antenna partially phased precoder (PC-4) that applies a rank-3 precoding matrix to the first antenna port group and a rank-2 precoding matrix to the second antenna port group or a rank-4 precoding matrix to the first antenna port group and a rank-1 precoding matrix to the second antenna port group; a one-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 2 states, which indicate a four-antenna partially phased precoder (PC-4) that applies a rank-4 precoding matrix to the first antenna port group and a rank-1 precoding matrix to the second antenna port group;A one-bit port group indicator and a first TPMI field with 1 state and a second TPMI field with 6 states, which indicate a non-coherent precoder that applies a rank-3 precoding matrix to a first antenna port group and a rank-2 precoding matrix to a second antenna port group; a one-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 8 states, which indicate a two-antenna partially coherent precoder (PC-2) that applies a rank-3 precoding matrix to a first antenna port group and a rank-2 precoding matrix to a second antenna port group or a rank-4 precoding matrix to a first antenna port group and a rank-1 precoding matrix to a second antenna port group; a one-bit port group indicator and a first TPMI field with 4 states and a second TPMI field with 8 states, which states indicate a four-antenna partially phased precoder (PC-4) in which a rank-3 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to the second antenna port group; a one-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 16 states, which states indicate a four-antenna partially phased precoder (PC-4) in which a rank-4 precoding matrix is ​​applied to the first antenna port group and a rank-1 precoding matrix is ​​applied to the second antenna port group; a two-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 16 states, which states indicate a four-antenna partially phased precoder (PC-4) in which a rank-4 precoding matrix is ​​applied to the first antenna port group and a rank-1 precoding matrix is ​​applied to the second antenna port group; A single TPMI field having a single state for a two-antenna port group or a non-coherent precoder that applies a rank-4 precoding matrix to the first antenna port group and a rank-1 precoding matrix to the second antenna port group; a two-bit port group indicator and a single TPMI field having two states for a two-antenna partially coherent precoder (PC-2) that indicates that a rank-3 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to the second antenna port group or a rank-4 precoding matrix is ​​applied to the first antenna port group and a rank-1 precoding matrix is ​​applied to the second antenna port group; a two-bit port group indicator and a four-antenna partially coherent precoder that indicates that a rank-3 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to the second antenna port group A single TPMI field with four states for a partially correlated precoder (PC-4); a two-bit port group indicator and a single TPMI field with two states indicating that a rank-4 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a second antenna port group; a two-bit port group indicator and a first TPMI field with 1 state and a second TPMI field with 1 state, which states indicate a non-correlated precoder that either a rank-3 precoding matrix is ​​applied to a first antenna port group and a rank-2 precoding matrix is ​​applied to a second antenna port group or a rank-4 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a second antenna port group;A two-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 2 states, the states indicating that a rank-3 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to the second antenna port group, or a rank-4 precoding matrix is ​​applied to the first antenna port group and a rank-1 precoding matrix is ​​applied to the second antenna port group for a two-antenna partially phased precoder (PC-2) or a four-antenna partially phased precoder (PC-4); a two-bit port group indicator and a first TPMI field with 4 states and a second TPMI field with 4 states, the states indicating that a rank-3 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to the second antenna port group for a four-antenna partially phased precoder (PC-4); a two-bit port group indicator and a first TPMI field with 1 state and a second TPMI field with 6 states, the states indicating that a rank-3 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to a non-phased precoding matrix for the second antenna port group coder; a two-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 8 states, which indicate a two-antenna partially phased precoder (PC-2) in which a rank-3 precoding matrix is ​​applied to a first antenna port group and a rank-2 precoding matrix is ​​applied to a second antenna port group or a rank-4 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a second antenna port group; a two-bit port group indicator and a first TPMI field with 4 states and a second TPMI field with 8 states, which indicate a four-antenna partially phased precoder (PC-4) in which a rank-3 precoding matrix is ​​applied to a first antenna port group and a rank-2 precoding matrix is ​​applied to a second antenna port group; or a two-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 16 states, which indicate a four-antenna partially phased precoder (PC-4) in which a rank-4 precoding matrix is ​​applied to a first antenna port group and a rank-1 precoding matrix is ​​applied to a second antenna port group. ;

[0603] In some aspects, an 8-port uplink MIMO precoder has a rank of 6, a relationship between a first precoding matrix applied to a first antenna port group and a second precoding matrix applied to a second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a single TPMI field having a single state of a non-coherent precoder indicating that a first rank 3 precoding matrix is ​​applied to the first antenna port group and a second rank 3 precoding matrix is ​​applied to the second antenna port group; a single TPMI field having a single state of a non-coherent precoder indicating that a first rank 3 precoding matrix is ​​applied to the first antenna port group and a second rank 3 precoding matrix is ​​applied to the second antenna port group, or a rank 4 precoding matrix is ​​applied to the first antenna port group and a rank 2 precoding matrix is ​​applied to the second antenna port group. A single TPMI field having two states for a two-antenna partially correlated precoder (PC-2) for a second antenna port group; a single TPMI field having four states for a four-antenna partially correlated precoder (PC-4) indicating that a first rank-3 precoding matrix is ​​applied to the first antenna port group and a second rank-3 precoding matrix is ​​applied to the second antenna port group or that a rank-4 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to the second antenna port group; a one-bit port group indicator and a first TPMI field having 1 state and a second TPMI field having 1 state, which states indicate that a rank-4 precoding matrix is ​​applied to the first antenna port and a rank-2 precoding matrix is ​​applied to the second antenna port. predecoder; a port group indicator and a first TPMI field with 2 states and a second TPMI field with 2 states, these states indicate a two-antenna partially phased predecoder (PC-2) that applies a rank-4 predecoding matrix to a first antenna port and a rank-2 predecoding matrix to a second antenna port; a port group indicator and a first TPMI field with 2 states and a second TPMI field with 2 states, these states indicate a four-antenna partially phased predecoder (PC-4) that applies a rank-4 predecoding matrix to a first antenna port group and a rank-1 predecoding matrix to a second antenna port group; a first TPMI field with 1 state and a second TPMI field with 1 state, these states A first TPMI field having a state indicating that a rank-3 precoding matrix is ​​applied to a first antenna port group and a rank-3 precoding matrix is ​​applied to a non-coherent precoding matrix for a second antenna port group; a first TPMI field having 2 states and a second TPMI field having 2 states, which states indicate a two-antenna partially-coherent precoding matrix (PC-2) that applies a first rank-3 precoding matrix to a first antenna port group and a second rank-3 precoding matrix to a second antenna port group; a first TPMI field having 4 states and a second TPMI field having 4 states, which states indicate a four-antenna partially-coherent precoding matrix (PC-4) that applies a first rank-3 precoding matrix to a first antenna port group and a second rank-3 precoding matrix to a second antenna port group;A first TPMI field having 1 state and a second TPMI field having 6 states, which indicate a non-coherent precoder that applies a rank-4 precoding matrix to a first antenna port group and a rank-2 precoding matrix to a second antenna port group; a first TPMI field having 2 states and a second TPMI field having 8 states, which indicate a two-antenna partially coherent precoder (PC-2) that applies a rank-4 precoding matrix to a first antenna port group and a rank-2 precoding matrix to a second antenna port group; a first TPMI field having 2 states and a second TPMI field having 8 states, which indicate a two-antenna partially coherent precoder (PC-2) that applies a rank-4 precoding matrix to a first antenna port group and a rank-2 precoding matrix to a second antenna port group. A four-antenna partially phased precoder (PC-4) in which the matrix is ​​applied to the second antenna port group; a two-bit port group indicator and a single TPMI field having a single state of a non-phased precoder indicating that a first rank-3 precoding matrix is ​​applied to the first antenna port group and a second rank-3 precoding matrix is ​​applied to the second antenna port group, or a rank-4 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to the second antenna port group; a two-bit port group indicator and a single state of a non-phased precoder indicating that a first rank-3 precoding matrix is ​​applied to the first antenna port group and a second rank-3 precoding matrix is ​​applied to the second antenna port group, or a rank-4 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to the second antenna port group A single TPMI field with two states for a two-antenna partially phased precoder (PC-2); a two-bit port group indicator and a single TPMI field with four states that a first rank-3 precoding matrix is ​​applied to a first antenna port group and a second rank-3 precoding matrix is ​​applied to a second antenna port group; a two-bit port group indicator and a single TPMI field with two states indicating that a rank-4 precoding matrix is ​​applied to a first antenna port group and a rank-2 precoding matrix is ​​applied to a second antenna port group; a two-bit port group indicator and a first TPMI field with 1 state and a second TPMI field with 1 state, which states indicate that the first rank-3 precoding matrix is ​​applied to A non-coherent precoder for a first antenna port group and a second rank-3 precoding matrix is ​​applied to the second antenna port group or a rank-4 precoding matrix is ​​applied to the first antenna port group and a rank-2 precoding matrix is ​​applied to the second antenna port group; a two-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 2 states, the states indicating a two-antenna partially-coherent precoder (PC-2) or a four-antenna partially-coherent precoder (PC-4) that applies a first rank-3 precoding matrix to the first antenna port group and a second rank-4 precoding matrix to the second antenna port group or a rank-4 precoding matrix to the first antenna port group and a rank-2 precoding matrix to the second antenna port group;A two-bit port group indicator and a first TPMI field with 4 states and a second TPMI field with 4 states, which indicate a four-antenna partially phased precoder (PC-4) that applies a first rank 3 precoding matrix to a first antenna port group and a second rank 3 precoding matrix to a second antenna port group; a two-bit port group indicator and a first TPMI field with 1 state and a second TPMI field with 6 states, which indicate a non-phased precoder that applies a rank 4 precoding matrix to a first antenna port group and a rank 2 precoding matrix to a second antenna port group; or a two-bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 8 states, which indicate a two-antenna partially phased precoder (PC-2) or a four-antenna partially phased precoder (PC-4) that applies a rank 4 precoding matrix to a first antenna port group and a rank 2 precoding matrix to a second antenna port group. ;

[0604] In some aspects, an 8-port uplink MIMO precoder has a rank 7, a relationship between a first precoding matrix applied to a first antenna port group and a second precoding matrix applied to a second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a single TPMI field having a single state of non-coherent precoders indicating that a rank 4 precoding matrix is ​​applied to the first antenna port group and a second rank 3 precoding matrix is ​​applied to the second antenna port group; a single TPMI field having two states indicating that a rank 4 precoding matrix is ​​applied to the first antenna port group and a second rank 3 precoding matrix is ​​applied to the second antenna port group A single TPMI field with two states for an antenna partially correlated precoder (PC-2) or a four-antenna partially correlated precoder (PC-4); a first TPMI field with 1 state and a second TPMI field with 1 state, which states indicate that a rank-4 precoding matrix is ​​applied to a first antenna port group and a second rank-3 precoding matrix is ​​applied to a second antenna port group; a first TPMI field with 2 states and a second TPMI field with 2 states, which states indicate that a rank-4 precoding matrix is ​​applied to a first antenna port group and a second rank-3 precoding matrix is ​​applied to a second antenna port group a two-antenna partially phased precoder (PC-2); a first TPMI field with 4 states and a second TPMI field with 4 states, which indicate a four-antenna partially phased precoder (PC-4) that applies a rank-4 precoding matrix to a first antenna port group and a second rank-3 precoding matrix to a second antenna port group; a one-bit port group indicator and a first TPMI field with 1 state and a second TPMI field with 1 state, which indicate a non-phased precoder that applies a rank-4 precoding matrix to a first antenna port group and a second rank-3 precoding matrix to a second antenna port group; a one-bit port group indicator and a first TPMI field with 1 state and a second TPMI field with 1 state, which indicate a non-phased precoder that applies a rank-4 precoding matrix to a first antenna port group and a second rank-3 precoding matrix to a second antenna port group; A bit port group indicator and a first TPMI field with 2 states and a second TPMI field with 2 states, which states indicate a two-antenna partially phased precoder (PC-2) in which a rank-4 precoding matrix is ​​applied to a first antenna port group and a second rank-3 precoding matrix is ​​applied to a second antenna port group; or a bit port group indicator and a first TPMI field with 4 states and a second TPMI field with 4 states, which states indicate a four-antenna partially phased precoder (PC-4) in which a rank-4 precoding matrix is ​​applied to a first antenna port group and a second rank-3 precoding matrix is ​​applied to a second antenna port group.In some aspects, an 8-port uplink MIMO precoder has a rank of 8, a relationship between a first precoding matrix applied to a first antenna port group and a second precoding matrix applied to a second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a single TPMI field with 1 state indicating a non-coherent precoder that applies a first rank 4 precoding matrix to the first antenna port group and a second rank 4 precoding matrix to the second antenna port group; a single TPMI field with two states indicating a two-antenna partially coherent precoder (PC-2) or a four-antenna partially coherent precoder (PC-4) that applies a first rank 4 precoding matrix to the first antenna port group and a second rank 4 precoding matrix to the second antenna port group; a first TMI field with 1 state A PMI field and a second TPMI field with 1 state, which states indicate a non-coherent precoder in which a first rank-4 precoding matrix is ​​applied to a first antenna port group and a second rank-4 precoding matrix is ​​applied to a second antenna port group; a first TPMI field with 2 states and a second TPMI field with 2 states, which states indicate a two-antenna partially-coherent precoder (PC-2) in which the first rank-4 precoding matrix is ​​applied to the first antenna port group and the second rank-4 precoding matrix is ​​applied to the second antenna port group; or a first TPMI field with 2 states and a second TPMI field with 2 states, which states indicate a four-antenna partially-coherent precoder (PC-4) in which the first rank-4 precoding matrix is ​​applied to the first antenna port group and the second rank-4 precoding matrix is ​​applied to the second antenna port group.

[0605] Fig.58A 5800 is a flow chart of a method of wireless communication. The method may be performed by a UE (eg, UE 104, 350; device 5904). The method may enable the UE to send UL MIMO transmissions using various precoding options for 8Tx.

[0606] At 5806, the UE receives control signaling for UL transmission. The reception may be performed, for example, by the codebook processing component 198, the transceiver 5922, and / or the antenna 5980. The codebook processing component 198 may be a component of the UE 104, 350 or the device 5904.

[0607] At 5812, the UE transmits a UL MIMO transmission precoded with an 8-port uplink MIMO precoder based on the control signaling and the set of two or more antenna port groups. The transmission may be performed, for example, by the codebook processing component 198, the transceiver 5922, and / or the antenna 5980. The codebook processing component 198 may be a component of the UE 104, 350, or the device 5904.

[0608] In some aspects, the precoder may provide a single precoder for each of the ranks 5, 6, 7, or 8 of the 8-port uplink MIMO precoder based on the rank of the UL MIMO transmission. In some aspects, the 8-port uplink MIMO precoder may be based on a discrete Fourier transform (DFT) codebook with an oversampling factor of 2 and a common phase. In some aspects, 8 precoders may be provided for each of the ranks 5 and 6, and 4 precoders may be provided for each of the ranks 7 and 8. In some aspects, 8 precoders may be provided for each of the ranks 5, 6, 7, and 8. In some aspects, the 8-port uplink MIMO precoder may be based on a codebook optimized for spatially uncorrelated channels. In some aspects, the codebook may be based on a combination of two 4×4 Householder matrices, and wherein a common phase is applied between two antenna port groups. In some aspects, an 8-port uplink MIMO predecoder may be based on an 8Tx predecoder based on co-phasing a predecoder of less than 8 antenna ports. In some aspects, a subset of an 8Tx predecoder may be used according to the rank of UL MIMO transmission. In some aspects, multiple layers may be transmitted using one or more groups of coherent antenna ports. In some aspects, one or more groups of coherent antenna ports may include a first subset of four coherent antenna ports and a second subset of four coherent antenna ports. In some aspects, one or more groups of coherent antenna ports may include a first subset of two coherent antenna ports, a second subset of two coherent antenna ports, and a third subset of four coherent antenna ports. In some aspects, one or more groups of coherent antenna ports may include a first subset of two coherent antenna ports, a second subset of two coherent antenna ports, a third subset of two coherent antenna ports, and a fourth subset of two coherent antenna ports. In some aspects, the UL MIMO transmission may be a combination of partially coherent transmission and non-coherent transmission, and wherein one or more groups of coherent antenna ports include a first subset of one antenna port, a second subset of one antenna port, a third subset of two coherent antenna ports, and a fourth subset of four coherent antenna ports. In some aspects, antenna ports from different antenna port groups may be configured in a single sounding reference signal (SRS) resource, each antenna port group having at least one of a different cyclic shift or a different comb index. In some aspects, antenna ports from different antenna port groups may be configured with different SRS resources.

[0609] Fig.58B 5850 is a flow ch...

Claims

1. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: Memory; as well as at least one processor coupled to the memory and based at least in part on the information stored in the memory, the at least one processor configured to: receiving control signaling for uplink multiple-input multiple-output (MIMO) transmission, the control signaling comprising a first transmitted precoding matrix indicator (TPMI) field and a second TPMI field and a sounding reference signal (SRS) resource set indicator; as well as The uplink MIMO transmission is transmitted precoded with an 8-port uplink MIMO precoder based on a 4-port uplink MIMO codebook with mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator.

2. The device according to claim 1, wherein: Based at least in part on the information stored in the memory, the at least one processor is further configured to: An 8-port precoding matrix is ​​constructed based on the 4-port uplink MIMO codebook and the mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator.

3. The apparatus of claim 2, wherein an SRS resource set indicator indicates a precoding matrix type, and the mapping from the 4-port uplink MIMO codebook to the 8-port precoding matrix is ​​indicated by a combination of the SRS resource set indicator, the first TPMI field, and the second TPMI field.

4. The apparatus of claim 3 , wherein the first TPMI field indicates a first rank and a first precoding matrix indication, and the second TPMI field indicates a second precoding matrix indication, the second rank being based on the first rank indicated in the first TPMI field and the precoding matrix type indicated by the SRS resource set indicator.

5. The apparatus according to claim 4, wherein the control signaling further comprises: a first SRS resource indicator (SRI), the first SRI indicating a first SRS resource associated with the first TPMI field, and A second SRI indicates a second SRS resource associated with the second TPMI field.

6. The apparatus of claim 2 , wherein the control signaling further comprises a first SRS resource indicator (SRI) and a second SRI, and the mapping from the 4-port uplink MIMO codebook to the 8-port precoding matrix is ​​indicated by a combination of the SRS resource set indicator, the first TPMI field, the second TPMI field, and the second SRI. 7 . The apparatus of claim 6 , wherein the first SRI indicates an SRS resource, and the second SRI indicates a precoding matrix type.

8. The apparatus according to claim 7, wherein the precoding matrix type is jointly indicated by the second SRI and the SRS resource set indicator.

9. The apparatus of claim 6, wherein the first TPMI field indicates a first rank and a first precoding matrix indication, and the second TPMI field indicates a second precoding matrix indication, the second rank being based on the first rank indicated in the first TPMI field, the SRS resource set indicator, and the second SRI.

10. The apparatus of claim 2, wherein the control signaling further comprises at least one SRS resource indicator (SRI), and the SRS resource set indicator at least partially indicates a precoding matrix type, and the mapping from the 4-port uplink MIMO codebook to the 8-port precoding matrix is ​​indicated by at least a combination of the SRS resource set indicator, the first TPMI field, and the second TPMI field.

11. The apparatus of claim 10, wherein the first TPMI field and the second TPMI field independently indicate a first precoding matrix and a second precoding matrix.

12. The apparatus of claim 11, wherein the first TPMI field indicates a first rank and the first precoding matrix, and the second TPMI field indicates a second rank and the second precoding matrix.

13. The apparatus of claim 10, wherein the SRS resource set indicator indicates the precoding matrix type independent of a second SRI.

14. The apparatus of claim 10, wherein the SRS resource set indicator indicates the precoding matrix type jointly with a second SRI, and a first SRI indicates resources associated with the first precoding matrix and the second precoding matrix.

15. The device according to claim 1, wherein: Based at least in part on the information stored in the memory, the at least one processor is further configured to: A configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports is received, wherein a first precoding matrix indicated by the first TPMI field is applied to the first antenna port group and a second precoding matrix indicated by the second TPMI field is applied to the second antenna port group.

16. The apparatus of claim 15 , wherein the control signaling comprises a precoding matrix type indicator, at least one SRS resource indicator (SRI) indicating SRS resources for the first and second precoding matrices, and the mapping from the 4-port uplink MIMO codebook to an 8-port precoding matrix is ​​indicated by at least the precoding matrix type indicator, the first TPMI field, and the second TPMI field.

17. The apparatus of claim 16, wherein the control signaling further comprises an additional bit indicating a precoding matrix type in combination with the precoding matrix type indicator, and the mapping from the 4-port uplink MIMO codebook to the 8-port precoding matrix is ​​further based on the additional bit.

18. The apparatus of claim 15, wherein the first antenna port group and the second antenna port group are indicated to the UE in a permutation matrix.

19. The apparatus of claim 1, wherein the control signaling further comprises a codebook subset indicator comprising at least one additional bit and indicating a subset from a set of codebook subsets comprising full coherent transmission, partial coherent transmission, or non-coherent transmission.

20. The apparatus of claim 19, wherein a first value of the codebook subset indicator corresponds to the partially coherent transmission or the incoherent transmission and indicates an 8-port uplink MIMO codebook constructed based on the 4-port uplink MIMO codebook, and a second value of the codebook subset indicator corresponds to the fully coherent transmission using a precoding matrix having all non-zero entries and jointly indicated by the first TPMI field and the second TPMI field.

21. The apparatus according to claim 1, wherein the control signaling further comprises: a first SRS resource indicator (SRI), the first SRI indicating an SRS resource; and a second SRI indicating a subset from a set of codebook subsets including fully coherent transmission, partially coherent transmission, or non-coherent transmission.

22. The apparatus of claim 21 , wherein the first value of the second SRI corresponds to the partially coherent transmission or the incoherent transmission and indicates an 8-port uplink MIMO codebook constructed based on the 4-port uplink MIMO codebook, and the second value of the second SRI corresponds to the fully coherent transmission using a precoding matrix having all non-zero entries and jointly indicated by the first TPMI field and the second TPMI field.

23. The apparatus of claim 1, wherein the SRS resource set indicator indicates a subset from a set of codebook subsets including full coherent transmission, partial coherent transmission, or non-coherent transmission.

24. The apparatus of claim 23 , wherein the first three values ​​of the SRS resource set indicator correspond to the partially coherent transmission or the incoherent transmission and indicate an 8-port uplink MIMO codebook constructed based on the 4-port uplink MIMO codebook, and the fourth value of the SRS resource set indicator corresponds to the fully coherent transmission using a precoding matrix having all non-zero entries and jointly indicated by the first TPMI field and the second TPMI field.

25. The apparatus of claim 1 , wherein the 8-port uplink MIMO precoder of rank 1 is based on a rank 1 precoding matrix and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO precoder is indicated by one of the following: A single bit port group indicator and a single TPMI field with four states indicating non-coherent predecoders; the single bit port group indicator and a first single TPMI field having eight states indicating a two-antenna partially correlated predecoder (PC-2); or The single bit port group indicator and a second single TPMI field having sixteen states indicating a four-antenna partially correlated predecoder (PC-4).

26. The apparatus of claim 1 , wherein a rank-2 precoding matrix is ​​applied to the 8-port uplink MIMO precoder of rank 2 of a first antenna port group having four antenna ports or a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO precoder is indicated by one of: A single bit port group indicator and a first single TPMI field having six states indicating non-coherent predecoders; or The single bit port group indicator and a second single TPMI field having eight states for a two-antenna partially correlated precoder (PC-2) or a four-antenna partially correlated precoder (PC-4).

27. The apparatus of claim 1, wherein the 8-port uplink MIMO precoder of rank 2 is based on a first rank 1 precoding matrix applied to a first antenna port group having four antenna ports and a second rank 1 precoding matrix applied to a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO precoder is indicated by one of: the first TPMI field and the second TPMI field, each TPMI field having four states indicating non-coherent predecoders; The first TPMI field and the second TPMI field, each TPMI field having eight states indicating a two-antenna partially correlated precoder (PC-2); The first TPMI field and the second TPMI field, each TPMI field having sixteen states indicating a four-antenna partially correlated precoder (PC-4); or A single TPMI field is combined with use of the same precoder for both the first antenna port group and the second antenna port group.

28. The apparatus of claim 1, wherein the 8-port uplink MIMO precoder of rank 2 and the configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a two-bit port group indicator and a first single TPMI field having six states indicating a first non-coherent predecoder based on a first rank-2 precoding matrix applied to the first antenna port group or the second antenna port group; the two-bit port group indicator and a second single TPMI field having eight states for a two-antenna partially phased precoder (PC-2) or a four-antenna partially phased precoder (PC-4) based on a second rank-2 precoding matrix applied to the first antenna port group or the second antenna port group; the two-bit port group indicator, the first TPMI field, and the second TPMI field, each TPMI field having four states indicating a second non-coherent predecoder based on two rank-1 precoding matrices applied to the first antenna port group or the second antenna port group; the two-bit port group indicator, the first TPMI field, and the second TPMI field, each TPMI field having eight states indicating the PC-2 based on a first set of two rank-1 precoding matrices applied to the first antenna port group or the second antenna port group; or The two-bit port group indicator, the first TPMI field, and the second TPMI field, each TPMI field having sixteen states indicating the PC-4 based on a first set of two rank-1 precoding matrices applied to the first antenna port group or the second antenna port group.

29. The apparatus of claim 1, wherein the 8-port uplink MIMO precoder of rank 2, wherein a rank 2 precoder is applied to a first antenna port group or a second antenna port group, or the same rank 1 precoder is applied to both the first antenna port group and the second antenna port group, the 8-port uplink MIMO precoder is indicated by one of the following: a two-bit port group indicator and a first single TPMI field having six states indicating a non-coherent predecoder based on the rank-2 predecoder applied to the first antenna port group or the second antenna port group; the two-bit port group indicator and a second single TPMI field having eight states for applying a single rank-2 pre-decoder to a first two-antenna partially correlated pre-decoder (PC-2) or a first four-antenna partially correlated pre-decoder (PC-4) for the first antenna port group or the second antenna port group; the two bit port group indicator and a third single TPMI field having 8 states indicating non-coherent predecoder states for a second PC-2 where the same rank 1 predecoder is applied to both the first antenna port group and the second antenna port group; the two bit port group indicator and a fourth single TPMI field having eight states for a third PC-2 wherein the same rank-1 precoder is applied to both the first antenna port group and the second antenna port group; or the two-bit port group indicator and a fifth single TPMI field having sixteen states indicating a second PC-4 wherein the same rank-1 precoder is applied to both the first antenna port group and the second antenna port group.

30. The apparatus of claim 1 , wherein the 8-port uplink MIMO precoder of rank 3 and the configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO precoder is indicated by one of: a single bit port group indicator and a first single TPMI field having a single state of a first non-coherent precoder indicating application of a single rank-3 precoding matrix to either the first antenna port group or the second antenna port group; the single bit port group indicator and a second single TPMI field having two states for applying the single rank-3 precoding matrix to a first two-antenna partially correlated precoder (PC-2) for applying the single rank-3 precoding matrix to the first antenna port group or the second antenna port group; the single bit port group indicator and a third single TPMI field having four states for applying the single rank-3 precoding matrix to a first four-antenna partially correlated precoder (PC-4) for applying the single rank-3 precoding matrix to the first antenna port group or the second antenna port group; the first TPMI field having six states and the second TPMI field having four states, the states indicating a second non-coherent precoder that applies a first rank-2 precoding matrix to the first antenna port group and a first rank-1 precoding matrix to the second antenna port group; the first TPMI field having eight states and the second TPMI field having 8 states, the states indicating a second PC-2 in which a second rank-2 precoding matrix is ​​applied to the first antenna port group and a second rank-1 precoding matrix is ​​applied to the second antenna port group; the first TPMI field having eight states and the second TPMI field having sixteen states, the states indicating that a third rank-2 precoding matrix is ​​applied to the first antenna port group and a third rank-1 precoding matrix is ​​applied to a second PC-4 of the second antenna port group; the first TPMI field having four states and the second TPMI field having six states, the states indicating a third non-coherent precoder that applies a fourth rank-2 precoding matrix to the first antenna port group and a fourth rank-1 precoding matrix to the second antenna port group; the first TPMI field having sixteen states and the second TPMI field having eight states, the states indicating that a fifth rank-2 precoding matrix is ​​applied to the first antenna port group and a fifth rank-1 precoding matrix is ​​applied to a third PC-4 of the second antenna port group; a two-bit port group indicator and the first single TPMI field having a single state of a fourth non-coherent precoder indicating application of the single rank-3 precoding matrix to the first antenna port group or the second antenna port group; the two-bit port group indicator and the second single TPMI field having two states of a third PC-2 indicating application of the single rank-3 precoding matrix to the first antenna port group or the second antenna port group; the two-bit port group indicator and the third single TPMI field having four states of a fourth PC-4 indicating application of the single rank-3 precoding matrix to the first antenna port group or the second antenna port group; the two-bit port group indicator, the first TPMI field having six states, and the second TPMI field having four states, the states indicating a fifth non-coherent precoder that applies a sixth rank-2 precoding matrix to the first antenna port group and a sixth rank-1 precoding matrix to the second antenna port group; the two-bit port group indicator, the first TPMI field having eight states, and the second TPMI field having 8 states, the states indicating that a seventh rank-2 precoding matrix is ​​applied to the first antenna port group and a seventh rank-1 precoding matrix is ​​applied to a fourth PC-2 of the second antenna port group; the two-bit port group indicator, the first TPMI field having eight states, and the second TPMI field having sixteen states, the states indicating that an eighth rank-2 precoding matrix is ​​applied to the first antenna port group and an eighth rank-1 precoding matrix is ​​applied to a fifth PC-4 of the second antenna port group; the two-bit port group indicator, the first TPMI field having four states, and the second TPMI field having six states, the states indicating a sixth non-coherent precoder that applies a ninth rank-2 precoding matrix to the first antenna port group and a ninth rank-1 precoding matrix to the second antenna port group; or The two-bit port group indicator, the first TPMI field having sixteen states, and the second TPMI field having eight states, the states indicating that the tenth rank 2 precoding matrix is ​​applied to the first antenna port group and the tenth rank 1 precoding matrix is ​​applied to the sixth PC-4 of the second antenna port group.

31. The apparatus of claim 1 , wherein the 8-port uplink MIMO precoder of rank 3 and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports have a relationship between a precoding matrix applied to the first antenna port group and the precoding matrix applied to the second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by a two-bit port group indicator and one of the following: a first single TPMI field having a single state of a first non-coherent precoder indicating application of a first rank-3 precoding matrix to the first antenna port group or the second antenna port group; a second single TPMI field having two states indicating application of a second rank-3 precoding matrix to a first two-antenna partially correlated precoder (PC-2) of the first antenna port group or the second antenna port group; a third single TPMI field having four states indicating a first four-antenna partially correlated precoder (PC-4) applying a third rank-3 precoding matrix to the first antenna port group or the second antenna port group; a fourth single TPMI field having six states indicating a second non-coherent precoder that applies a first rank-2 precoding matrix to the first antenna port group and applies a first rank-1 precoding matrix to the second antenna port group; or A fifth single TPMI field having eight states indicating a second PC-2 or a second PC-4 that a second rank-2 precoding matrix is ​​applied to the first antenna port group and a second rank-1 precoding matrix is ​​applied to the second antenna port group.

32. The apparatus of claim 1 , wherein the 8-port uplink MIMO precoder of rank 4 and the configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports, wherein the 8-port uplink MIMO precoder is indicated by one of: a single bit port group indicator and a first single TPMI field having a single state of a first non-coherent predecoder indicating application of a first rank-4 precoding matrix to the first antenna port group or the second antenna port group; the single bit port group indicator and a second single TPMI field having two states for applying a second rank-4 precoding matrix to a first two-antenna partially correlated precoder (PC-2) of the first antenna port group or the second antenna port group; the single bit port group indicator and a third single TPMI field having two states for applying a third rank-4 precoding matrix to a first four-antenna partially correlated precoder (PC-4) for the first antenna port group or the second antenna port group; the first TPMI field and the second TPMI field each having six states, the states indicating a second non-coherent precoder that applies a first rank-2 precoding matrix to the first antenna port group and a second rank-2 precoding matrix to the second antenna port group; the first TPMI field and the second TPMI field each having 8 states, the states indicating that a third rank-2 precoding matrix is ​​applied to the first antenna port group and a fourth rank-2 precoding matrix is ​​applied to a second PC-2 or a second PC-4 of the second antenna port group; a two-bit port group indicator and a fourth single TPMI field having a single state of a third non-coherent precoder indicating application of a fourth rank-4 precoding matrix to the first antenna port group or the second antenna port group; the two-bit port group indicator and a fifth single TPMI field having two states indicating that a third PC-2 or a third PC-4 of a fifth rank-4 precoding matrix is ​​applied to the first antenna port group or the second antenna port group; the two-bit port group indicator, the first TPMI field and the second TPMI field each having six states, the states indicating a fourth non-coherent precoder that applies a fifth rank-2 precoding matrix to the first antenna port group and a sixth rank-2 precoding matrix to the second antenna port group; or The two-bit port group indicator, the first TPMI field having eight states, and the second TPMI field having 8 states, the states indicating that the seventh rank 2 precoding matrix is ​​applied to the first antenna port group and the eighth rank 2 precoding matrix is ​​applied to the fourth PC-2 or the fourth PC-4 of the second antenna port group.

33. The apparatus of claim 1 , wherein the 8-port uplink MIMO precoder of rank 4 and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports have a relationship between a precoding matrix applied to the first antenna port group and the precoding matrix applied to the second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by a two-bit port group indicator and one of the following: a first single TPMI field having a single state of a first non-coherent precoder indicating application of a first rank-4 precoding matrix to the first antenna port group or the second antenna port group; a second single TPMI field having two states indicating application of a second rank-4 precoding matrix to a first two-antenna partially correlated precoder (PC-2) of the first antenna port group or the second antenna port group; a third single TPMI field having four states indicating a first four-antenna partially correlated precoder (PC-4) applying a third rank-4 precoding matrix to the first antenna port group or the second antenna port group; a fourth single TPMI field having six states indicating a second non-coherent precoder that applies a first rank-2 precoding matrix to the first antenna port group and a second rank-2 precoding matrix to the second antenna port group; or A fifth single TPMI field having eight states indicating a second PC-2 or a second PC-4 that a third rank-2 precoding matrix is ​​applied to the first antenna port group and a fourth rank-2 precoding matrix is ​​applied to the second antenna port group.

34. The apparatus of claim 1 , wherein the 8-port uplink MIMO precoder of rank 5 and a configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports have a relationship between a precoding matrix applied to the first antenna port group and the precoding matrix applied to the second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a one-bit port group indicator and a first single TPMI field having a single state of a first non-coherent precoder indicating either applying a rank-3 precoding matrix to the first antenna port group and a rank-2 precoding matrix to the second antenna port group or applying a rank-4 precoding matrix to the first antenna port group and a rank-1 precoding matrix to the second antenna port group; the one-bit port group indicator and a second single TPMI field having two states of a first two-antenna partially correlated precoder (PC-2) indicating applying the rank-3 precoding matrix to the first antenna port group and the rank-2 precoding matrix to the second antenna port group or applying the rank-4 precoding matrix to the first antenna port group and the rank-1 precoding matrix to the second antenna port group; the one-bit port group indicator and a third single TPMI field having four states of a first four-antenna partially correlated precoder (PC-4) indicating applying the rank-3 precoding matrix to the first antenna port group and the rank-2 precoding matrix to the second antenna port group or applying the rank-4 precoding matrix to the first antenna port group and the rank-1 precoding matrix to the second antenna port group; the one-bit port group indicator and the first TPMI field having 1 state and the second TPMI field having 1 state, the state indicating a second non-coherent precoder that applies the rank-3 precoding matrix to the first antenna port group and the rank-2 precoding matrix to the second antenna port group; the one-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating a second PC-2 of applying the rank-3 precoding matrix to the first antenna port group and applying the rank-2 precoding matrix to the second antenna port group or applying the rank-4 precoding matrix to the first antenna port group and applying the rank-1 precoding matrix to the second antenna port group; the one-bit port group indicator and the first TPMI field having 4 states and the second TPMI field having 4 states, the states indicating a second PC-4 in which the rank-3 precoding matrix is ​​applied to the first antenna port group and the rank-2 precoding matrix is ​​applied to the second antenna port group or the rank-4 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to the second antenna port group; the one-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating a third PC-4 that the rank-4 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to the second antenna port group; the one-bit port group indicator and the first TPMI field having 1 state and the second TPMI field having 6 states, the states indicating a third non-coherent precoder that applies the rank-3 precoding matrix to the first antenna port group and the rank-2 precoding matrix to the second antenna port group; the one-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 8 states, the states indicating a third PC-2 of applying the rank-3 precoding matrix to the first antenna port group and applying the rank-2 precoding matrix to the second antenna port group or applying the rank-4 precoding matrix to the first antenna port group and applying the rank-1 precoding matrix to the second antenna port group; the one-bit port group indicator and the first TPMI field having 4 states and the second TPMI field having 8 states, the states indicating a fourth PC-4 that the rank-3 precoding matrix is ​​applied to the first antenna port group and the rank-2 precoding matrix is ​​applied to the second antenna port group; the one-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 16 states, the states indicating a fifth PC-4 that the rank-4 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to the second antenna port group; a two-bit port group indicator and a fourth single TPMI field having a single state of a fourth non-coherent precoder indicating either applying the rank-3 precoding matrix to the first antenna port group and applying the rank-2 precoding matrix to the second antenna port group or applying the rank-4 precoding matrix to the first antenna port group and applying the rank-1 precoding matrix to the second antenna port group; the two-bit port group indicator and a fifth single TPMI field having two states of a fourth PC-2 indicating that the rank-3 precoding matrix is ​​applied to the first antenna port group and the rank-2 precoding matrix is ​​applied to the second antenna port group or the rank-4 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to the second antenna port group; the two-bit port group indicator and a sixth single TPMI field having four states of a sixth PC-4 indicating that the rank-3 precoding matrix is ​​applied to the first antenna port group and the rank-2 precoding matrix is ​​applied to the second antenna port group; the two-bit port group indicator and a seventh single TPMI field having two states of a seventh PC-4 indicating that the rank-4 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to the second antenna port group; the two-bit port group indicator and the first TPMI field having 1 state and the second TPMI field having 1 state, the state indicating a fifth non-coherent precoder that applies the rank-3 precoding matrix to the first antenna port group and the rank-2 precoding matrix to the second antenna port group or that applies the rank-4 precoding matrix to the first antenna port group and the rank-1 precoding matrix to the second antenna port group; The two-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating that the rank-3 precoding matrix is ​​applied to the first antenna port group and the rank-2 precoding matrix is ​​applied to the second antenna port group or the rank-4 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to the fifth PC-2 or the eighth PC-4 of the second antenna port group; the two-bit port group indicator and the first TPMI field having 4 states and the second TPMI field having 4 states, the states indicating that the rank-3 precoding matrix is ​​applied to the first antenna port group and the rank-2 precoding matrix is ​​applied to a ninth PC-4 of the second antenna port group; the two-bit port group indicator and the first TPMI field having 1 state and the second TPMI field having 6 states, the states indicating a sixth non-coherent precoder that applies the rank-3 precoding matrix to the first antenna port group and the rank-2 precoding matrix to the second antenna port group; the two-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 8 states, the states indicating a sixth PC-2 of applying the rank-3 precoding matrix to the first antenna port group and applying the rank-2 precoding matrix to the second antenna port group or applying the rank-4 precoding matrix to the first antenna port group and applying the rank-1 precoding matrix to the second antenna port group; the two-bit port group indicator and the first TPMI field having 4 states and the second TPMI field having 8 states, the states indicating that the rank-3 precoding matrix is ​​applied to the first antenna port group and the rank-2 precoding matrix is ​​applied to the tenth PC-4 of the second antenna port group; or The two-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 16 states, the states indicating that the rank-4 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to the eleventh PC-4 of the second antenna port group.

35. The apparatus of claim 1, wherein the 8-port uplink MIMO precoder of rank 6, wherein there is a relationship between a first precoding matrix applied to a first antenna port group and a second precoding matrix applied to a second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a first single TPMI field having a single state of a first non-coherent precoder indicating applying a first rank-3 precoding matrix to the first antenna port group and applying a second rank-3 precoding matrix to the second antenna port group; a second single TPMI field having two states of a first two-antenna partially correlated precoder (PC-2) indicating either applying a third rank-3 precoding matrix to the first antenna port group and applying a fourth rank-3 precoding matrix to the second antenna port group or applying a first rank-4 precoding matrix to the first antenna port and applying a first rank-2 precoding matrix to the second antenna port; a third single TPMI field having four states of a first four-antenna partially correlated precoder (PC-4) indicating that a fifth rank-3 precoding matrix is ​​applied to the first antenna port group and a sixth rank-3 precoding matrix is ​​applied to the second antenna port group or a second rank-4 precoding matrix is ​​applied to the first antenna port and a second rank-2 precoding matrix is ​​applied to the second antenna port; a one-bit port group indicator and the first TPMI field having 1 state and the second TPMI field having 1 state, the state indicating a second non-coherent precoder that applies a third rank-4 precoding matrix to the first antenna port and a third rank-2 precoding matrix to the second antenna port; the one-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating a second PC-2 in which a fourth rank-4 precoding matrix is ​​applied to the first antenna port and a fourth rank-2 precoding matrix is ​​applied to the second antenna port; the one-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating that a fifth rank-4 precoding matrix is ​​applied to the first antenna port group and the rank-1 precoding matrix is ​​applied to a second PC-4 of the second antenna port group; the first TPMI field having 1 state and the second TPMI field having 1 state, the state indicating a third non-coherent precoder that applies a seventh rank-3 precoding matrix to the first antenna port group and an eighth rank-3 precoding matrix to the second antenna port group; the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating that a ninth rank-3 precoding matrix is ​​applied to the first antenna port group and a tenth rank-3 precoding matrix is ​​applied to a third PC-2 of the second antenna port group; the first TPMI field having 4 states and the second TPMI field having 4 states, the states indicating that an eleventh rank-3 precoding matrix is ​​applied to the first antenna port group and a twelfth rank-3 precoding matrix is ​​applied to a third PC-4 of the second antenna port group; the first TPMI field having 1 state and the second TPMI field having 6 states, the states indicating a fourth non-coherent precoder that applies a sixth rank-4 precoding matrix to the first antenna port group and a fifth rank-2 precoding matrix to the second antenna port group; the first TPMI field having 2 states and the second TPMI field having 8 states, the states indicating that a seventh rank-4 precoding matrix is ​​applied to the first antenna port group and a sixth rank-2 precoding matrix is ​​applied to a fourth PC-2 of the second antenna port group; the first TPMI field having 2 states and the second TPMI field having 8 states, the states indicating that an eighth rank-4 precoding matrix is ​​applied to the first antenna port group and a seventh rank-2 precoding matrix is ​​applied to a fourth PC-4 of the second antenna port group; a two-bit port group indicator and a single TPMI field having a single state of a fifth non-coherent precoder indicating that a thirteenth rank-3 precoding matrix is ​​applied to the first antenna port group and a fourteenth rank-3 precoding matrix is ​​applied to the second antenna port group or a ninth rank-4 precoding matrix is ​​applied to the first antenna port group and an eighth rank-2 precoding matrix is ​​applied to the second antenna port group; the two-bit port group indicator and a single TPMI field having two states of a fifth PC-2 indicating that a fifteenth rank-3 precoding matrix is ​​applied to the first antenna port group and a sixteenth rank-3 precoding matrix is ​​applied to the second antenna port group or a tenth rank-4 precoding matrix is ​​applied to the first antenna port group and a ninth rank-2 precoding matrix is ​​applied to the second antenna port group; the two-bit port group indicator and a single TPMI field having four states to apply the first rank-3 precoding matrix to the first antenna port group and to apply the second rank-3 precoding matrix to the second antenna port group; the two-bit port group indicator and a single TPMI field having two states of a fifth PC-4 indicating that an eleventh rank-4 precoding matrix is ​​applied to the first antenna port group and a tenth rank-2 precoding matrix is ​​applied to the second antenna port group; the two-bit port group indicator and the first TPMI field having 1 state and the second TPMI field having 1 state, the state indicating a sixth non-coherent precoder that applies the first rank-3 precoding matrix to the first antenna port group and the second rank-3 precoding matrix to the second antenna port group or that applies a twelfth rank-4 precoding matrix to the first antenna port group and an eleventh rank-2 precoding matrix to the second antenna port group; The two-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating that the first rank-3 precoding matrix is ​​applied to the first antenna port group and the thirteenth rank-4 precoding matrix is ​​applied to the second antenna port group or the fourteenth rank-4 precoding matrix is ​​applied to the first antenna port group and the twelfth rank-2 precoding matrix is ​​applied to the sixth PC-2 or the sixth PC-4 of the second antenna port group; the two-bit port group indicator and the first TPMI field having 4 states and the second TPMI field having 4 states, the states indicating that the first rank-3 precoding matrix is ​​applied to the first antenna port group and the second rank-3 precoding matrix is ​​applied to a seventh PC-4 of the second antenna port group; the two-bit port group indicator and the first TPMI field having 1 state and the second TPMI field having 6 states, the states indicating that a fifteenth rank-4 precoding matrix is ​​applied to the first antenna port group and a thirteenth rank-2 precoding matrix is ​​applied to a seventh non-coherent precoder of the second antenna port group; or The two-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 8 states, the states indicating that the sixteenth rank-4 precoding matrix is ​​applied to the first antenna port group and the fourteenth rank-2 precoding matrix is ​​applied to the seventh PC-2 or the eighth PC-4 of the second antenna port group.

36. The apparatus of claim 1, wherein the 8-port uplink MIMO precoder of rank 7, wherein there is a relationship between a first precoding matrix applied to a first antenna port group and a second precoding matrix applied to a second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by one of the following: a first single TPMI field having a single state of a first non-coherent precoder indicating applying a first rank-4 precoding matrix to the first antenna port group and applying a first second rank-3 precoding matrix to the second antenna port group; a second single TPMI field having two states indicating a first two-antenna partially correlated precoder (PC-2) or a first four-antenna partially correlated precoder (PC-4) that a second rank-4 precoding matrix is ​​applied to the first antenna port group and a second rank-3 precoding matrix is ​​applied to the second antenna port group; the first TPMI field having 1 state and the second TPMI field having 1 state, the state indicating a second non-coherent precoder that applies a third rank-4 precoding matrix to the first antenna port group and a third rank-3 precoding matrix to the second antenna port group; the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating that a fourth rank-4 precoding matrix is ​​applied to the first antenna port group and a fourth rank-3 precoding matrix is ​​applied to a second PC-2 of the second antenna port group; the first TPMI field having 4 states and the second TPMI field having 4 states, the states indicating that a fifth rank-4 precoding matrix is ​​applied to the first antenna port group and a fifth second rank-3 precoding matrix is ​​applied to a second PC-4 of the second antenna port group; a one-bit port group indicator and the first TPMI field having 1 state and the second TPMI field having 1 state, the state indicating a third non-coherent precoder that applies a sixth rank-4 precoding matrix to the first antenna port group and a sixth rank-3 precoding matrix to the second antenna port group; the one-bit port group indicator and the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating that a seventh rank-4 precoding matrix is ​​applied to the first antenna port group and an eighth rank-3 precoding matrix is ​​applied to a third PC-2 of the second antenna port group; or The one-bit port group indicator and the first TPMI field having 4 states and the second TPMI field having 4 states, the states indicating that the ninth rank-4 precoding matrix is ​​applied to the first antenna port group and the ninth rank-3 precoding matrix is ​​applied to the third PC-4 of the second antenna port group.

37. The apparatus of claim 1, wherein the 8-port uplink MIMO precoder of rank 8, wherein there is a relationship between a first precoding matrix applied to a first antenna port group and a second precoding matrix applied to a second antenna port group, wherein the 8-port uplink MIMO precoder is indicated by one of: a first single TPMI field having 1 state of a first non-coherent precoder indicating applying a first rank-4 precoding matrix to the first antenna port group and applying a second rank-4 precoding matrix to the second antenna port group; a second single TPMI field having two states indicating a first two-antenna partially correlated precoder (PC-2) or a first four-antenna partially correlated precoder (PC-4) to apply the first rank-4 precoding matrix to the first antenna port group and to apply the second rank-4 precoding matrix to the second antenna port group; the first TPMI field having 1 state and the second TPMI field having 1 state, the state indicating a second non-coherent precoder that applies the first rank-4 precoding matrix to the first antenna port group and applies the second rank-4 precoding matrix to the second antenna port group; the first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating that the first rank-4 precoding matrix is ​​applied to the first antenna port group and the second rank-4 precoding matrix is ​​applied to a second PC-2 of the second antenna port group; or The first TPMI field having 2 states and the second TPMI field having 2 states, the states indicating that the first rank-4 precoding matrix is ​​applied to the first antenna port group and the second rank-4 precoding matrix is ​​applied to a second PC-4 of the second antenna port group.

38. An apparatus for wireless communication at a network node, the apparatus comprising: Memory; as well as at least one processor coupled to the memory and based at least in part on the information stored in the memory, the at least one processor configured to: Outputting control signaling for uplink multiple-input multiple-output (MIMO) transmission for transmission, the control signaling comprising a first transmitted precoding matrix indicator (TPMI) field and a second TPMI field and a sounding reference signal (SRS) resource set indicator; as well as The uplink MIMO transmission is received precoded with an 8-port uplink MIMO precoder based on a 4-port uplink MIMO codebook with a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator.

39. The apparatus of claim 38, wherein an 8-port precoding matrix for the uplink MIMO transmission is based on the 4-port uplink MIMO codebook and the mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator.

40. The device according to claim 1, wherein Based at least in part on the information stored in the memory, the at least one processor is further configured to: A configuration of a first antenna port group having four antenna ports and a second antenna port group having four antenna ports is output for transmission, wherein a first precoding matrix indicated by the first TPMI field is applied to the first antenna port group and a second precoding matrix indicated by the second TPMI field is applied to the second antenna port group.

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