Decomposition of recommended precoder characteristics as channel state information feedback in multi-transmit / receive point operation

Abstract

In a wireless network, a user equipment (UE) calculates channel characteristics (H TRP ) set. The UE then determines the corresponding H TRP Based on this, a precoder (W TRP The UE determines a set of recommended W-domains in both the spatial domain (SD) and the frequency domain (FD) based on one or more SD bases and one or more FD bases. TRP The recommendation is selectively decomposed into SD and FD coefficients. The UE then transmits the spatial and frequency domain coefficients to the network / base station.

Description

[Technical Field]

[0001]

[0001] This disclosure generally relates to communication systems, and more specifically, in some examples, to the decomposition of recommended precoder characteristics as channel state information feedback in multi-transmission reception point (M-TRP) operation. [Background technology]

[0002]

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunications services, including telephone, video, data, messaging, and broadcast. Typical wireless communication systems can employ multiple access technologies that support communication with a large number of 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. These multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the city, national, regional, and even global levels. An exemplary telecommunications standard is 5G New Radio (NR). 5G NR is part of the ongoing evolution of mobile broadband, announced by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (for example, for the Internet of Things, IoT), and other requirements.5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR can be based on the 4G Long Term Evolution (LTE) standard. Further improvements are needed in 5G NR technology. These improvements may also be applicable to other multiple access technologies and the telecommunications standards that employ them. [Overview of the project]

[0003]

[0003] Hereinafter, a simplified outline of one or more embodiments is presented to provide a basic understanding of such embodiments. This outline is not intended to be a comprehensive overview of all intended embodiments, nor to identify the main or important elements of all embodiments, nor to precisely define (delineate) the scope of any or all embodiments. Its sole purpose is to present in a simplified form some concepts of one or more embodiments as a preface to the more detailed descriptions that will be presented later.

[0004]

[0004] The technology disclosed herein includes methods, apparatus, and computer-readable media for wireless communication, including instructions. In aspects of the technology disclosed herein, methods, non-temporary computer-readable media, and apparatus are provided for reporting the coefficients of a recommended precoder matrix to a network / base station and for configuring a UE for such reporting. Such technology is used, for example, when a UE receives coherent joint transmissions from multiple transmission reception points (TRPs) of a network.

[0005]

[0005] In such examples, for each channel between the UE and each such TRP, the UE determines a set of channel characteristics (H TRP ). Then, based on the corresponding H TRP , the UE determines a set of precoder (W TRP ) recommendations for each such channel. The UE selectively decomposes the W TRP recommendations in both the spatial domain (SD) and the frequency domain (FD) into SD coefficients and FD coefficients based on one or more spatial domain (SD) bases and one or more frequency domain (FD) bases. Then, the UE transmits the spatial domain coefficients and the frequency domain coefficients to the network / base station.

[0006]

[0006] In some examples, the selective decomposition includes one of: i) jointly decomposing the W TRP recommendations in the SD based on a common SD basis matrix across the TRPs and jointly decomposing the W TRP recommendations in the FD based on a common FD basis matrix across the TRPs; ii) jointly decomposing the W TRP recommendations in the SD based on a common SD basis matrix across the TRPs and individually decomposing each W TRP recommendation in the FD based on a channel-specific FD basis matrix; iii) individually decomposing each W TRP recommendation in the SD on a channel-specific SD basis matrix and jointly decomposing the W TRP recommendations in the FD based on a common FD basis matrix across the TRPs; and iv) individually decomposing each W TRP recommendation in the SD on a channel-specific SD basis matrix and individually decomposing each W TRP recommendation in the FD based on a channel-specific FD basis matrix.

[0007]

[0007] In some examples, before selectively decomposing, the UE uses one of i), ii), iii), and iv) to obtain W TRPInstructions for selectively decomposing recommendations are received from the network / base station. In such examples, selective decomposition involves selectively decomposing according to the received instructions. In some such examples, the instructions are received by the UE via radio resource control (RRC) messages from the network / base station to the UE.

[0008]

[0008] In some cases, decomposition is selected by the UE. In some such cases, the UE selects each W in the SD on a channel-specific SD basis. TRP The UE chooses to decompose the recommendations individually. The UE determines whether the channel state information (CSI) ports for each TRP are configured to the same CSI reference signal (CSI-RS) resource. If the UE determines that the CSI ports for each TRP are configured to the same CSI-RS resource, it uses a common FD basis across the TRPs to determine the W in the FD. TRP If you choose to perform joint decomposition across recommendations and determine that the CSI ports for each TRP are not configured to the same CSI-RS resource, then, based on the channel-specific FD basis, each W in the FD will be... TRP Choose to break down the recommendations into individual components.

[0009]

[0009] In some examples, the UE is based on one or more SD bases and one or more FD bases, with W in both SD and FD. TRP The UE's ability to selectively decompose recommendations into SD and FD coefficients is reported to the network / base station.

[0010]

[0010] From the perspective of a network / base station, computer-readable media including methods, apparatus, and instructions for wireless communication are included in the technology disclosed herein. In some examples, a network / base station receives coherent joint transmissions from multiple TRPs of the network from each of multiple UEs, based on one or more SD bases and one or more FD bases known to both the UE and the network, and disassembles W TRP Receive the SD coefficients and FD coefficients describing the recommended set. TRP The recommendation is to use channel characteristics H measured in the UE. TRP This is based on a corresponding set of factors. The network determines a precoder for each such UE based on the received SD factor, the received FD factor, and known bases. The network / base station then precodes one or more communications from the network / base station to each such UE using the corresponding determined precoder.

[0011]

[0011] In some such examples, the network / base station is based on one or more SD bases and one or more FD bases known to both the network / base station and one or more such UEs, with W in both SD and FD. TRP The recommendation is to send one or more UE-specific settings to the UE for selective decomposition into SD and FD factors. In such an example, the network / base station receives the subsequent SD and FD factors based on the transmitted UE-specific settings. In some such examples, transmitting includes transmitting in an RRC message.

[0012]

[0012] To achieve the above-mentioned and related objectives, one or more embodiments include features that are fully described below and, in particular, pointed out in the claims. The following description and accompanying drawings detail specific exemplary features of one or more embodiments. However, these features represent only a small number of the various schemes that can employ the principles of various embodiments, and this description is intended to include all such embodiments and their equivalents. [Brief explanation of the drawing]

[0013] [Figure 1]

[0013] This figure shows an example of a wireless communication system and access network. [Figure 2]

[0014] This is a diagram illustrating an exemplary distributed base station architecture. [Figure 3A]

[0015] This figure shows an example of the first 5G / NR frame. [Figure 3B] This figure shows an example of a DL channel within a 5G / NR subframe. [Figure 3C] This figure shows an example of a second 5G / NR frame. [Figure 3D] This figure shows an example of a UL channel within a 5G / NR subframe. [Figure 4]

[0016] This figure shows a base station and user equipment (UE) in an access network, as an example of the technology disclosed herein. [Figure 5]

[0017] This is a flowchart illustrating a method of wireless communication using an example of the technology disclosed herein. [Figure 6]

[0018] This is a flowchart illustrating a method of wireless communication using an example of the technology disclosed herein. [Figure 7]

[0019] This is a flowchart illustrating a method of wireless communication using an example of the technology disclosed herein. [Figure 8]

[0020] This is a flowchart illustrating a method of wireless communication using an example of the technology disclosed herein. [Figure 9]

[0021] This is a block diagram of a UE, an example of the technology disclosed herein. [Figure 10]

[0022] This is a flowchart illustrating a method of wireless communication using an example of the technology disclosed herein. [Figure 11]

[0023] This is a flowchart illustrating a method of wireless communication using an example of the technology disclosed herein. [Figure 12]

[0024] This is a block diagram of a base station, an example of the technology disclosed herein. [Modes for carrying out the invention]

[0014]

[0025] The detailed descriptions below, in relation to the attached drawings, describe various configurations and are not intended to represent only the configurations in which the concepts described herein can be put into practice. “Modes for Carrying Out the Invention” include specific details intended to provide a complete understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be put into practice without these specific details. In some cases, well-known structures and components are shown in block diagrams to avoid obscuring such concepts.

[0015]

[0026] In wireless communications as described herein, channel status information (CSI) characterizes how a signal propagates through a channel from the transmitter to the receiver. CSI can represent the combined effects of channel characteristics such as scattering, fading, and power loss. Typically, a transmitter (base station, network, TRP, etc.) includes a CSI reference signal (CSI-RS) known to / determinable by the receiver (UE, etc.) in its transmission to the receiver. The receiver uses the CSI-RS to estimate the channel characteristics. After estimating the channel characteristics based on the CSI-RS, the receiver can report the channel characteristics to the transmitter. The transmitter can then precode subsequent transmissions to the receiver using a precoder based on the reported channel characteristics to improve the received signal quality.

[0016]

[0027] A Transmit / Receive Point (TRP) is an antenna array with one or more antenna elements available to a network located at a specific geographical location within a particular area. In some cases, the use of two or more TRPs, each operating on a separate physical channel, at different locations or base stations by a network / base station for transmission to a UE receiver is sometimes referred to as a multi-TRP (M-TRP), regardless of whether one or more antennas are used in the TRP.

[0017]

[0028] In some single TRP instances, for each subband from the TRP, the UE can estimate the channel matrix H using CSI-RS. The UE can then derive a recommended precoder described by matrix W based on the channel matrix H. Instead of reporting all of W to the network / base station, the UE can leverage properties of W known to both the UE and the network / base station. Specifically, W is the spatial domain (SD) basis (beam) W. s It can be decomposed (compressed) by the set of SD base W. sThis is known to both the UE and the network / base station. The UE reports indices and coefficients for a set of SD bases (e.g., a subset selected from the entire set of SD bases). The coefficients are, as shown in equation (1), a common part W1 for the broadband (covering all subbands) and subband-specific coefficients for each subband.

[0018]

number

[0019] It can be further broken down into these.

[0020]

number

[0021]

[0029] For frequency-domain correlation of channels across different subbands (1 to N), the coefficients across subbands are given by equation (2)

[0022]

number

[0023] As shown, it can be stacked on a vector / matrix.

[0024]

number

[0025]

[0030] Next, the subband coefficients can be further decomposed (compressed) by the set of FD basis factors, as shown in equation (3).

[0026]

number

[0027]

[0031] Next, UE is W based on the relationship in equation (4). s and W fWe can report the indices and coefficients for a set of FD bases (a subset selected from the entire set of SD bases), where W1 and W t These are the SD basis matrix and the FD basis matrix, respectively. Note that each basis matrix contains one or more basis vectors from its respective region. W TPR =W s ×W1×W t ×W f (4)

[0028]

[0032] For M-TRP, for example, in the case of coherent joint transmission (CJT) across multiple channels using M-TRP, different channels have different channel matrices H TRP It can be characterized by the following. In aspects of the technology disclosed herein, the recommended precoder matrix W TRP Methods, non-temporary computer-readable media, and apparatus are provided for reporting to a network / base station and for configuring a UE for such reporting. Such techniques are used when a UE receives transmissions from multiple transmit / receive points (TRPs) of a network / base station.

[0029]

[0033] In an example of such technology, the UE determines the channel characteristic H for each such TRP and UE. TRP Determine the set of H. Then the UE determines the corresponding H TRP Based on this, a set of precoders for each such channel (W TRP The UE determines the recommendation for W in both the spatial domain (SD) and the frequency domain (FD) based on one or more SD bases and one or more FD bases. TRP The recommendation is selectively decomposed into SD coefficients and FD coefficients. The UE then transmits the spatial domain coefficients and frequency domain coefficients to the network / base station.

[0030]

[0034] In some cases, selective decomposition is i) based on a common SD basis matrix across TRP, W in SDTRP Joint decomposition across recommendations, and based on a common FD basis matrix across TRP, W in FD TRP ii) Joint decomposition across recommendations, and based on a common SD basis matrix across TRP, W in SD TRP Joint decomposition is performed across recommendations, and each W in FD is determined based on the channel-specific FD basis matrix. TRP iii) Decompose the recommendations individually, each W in the SD on the channel-specific SD basis matrix TRP The recommendations are individually decomposed, and based on a common FD basis matrix across TRPs, W in FD TRP Recommended joint decomposition across the recommendations, and iv) each W in the SD on the channel-specific SD basis matrix. TRP The recommendations are individually decomposed, and each W in FD is determined based on the channel-specific FD basis matrix. TRP This includes one of the following: breaking down recommendations into their individual components.

[0031]

[0035] In some cases, UE uses one of i), ii), iii), and iv) before selectively decomposing W TRP Instructions for selectively decomposing recommendations are received from the network / base station. In such examples, selective decomposition involves selectively decomposing according to the received instructions. In some such examples, the instructions are received by the UE via Radio Resource Control (RRC) messages from the network / base station to the UE.

[0032]

[0036] In some cases, decomposition is chosen by the UE. In some such cases, the UE chooses each W in the SD on a channel-specific SD basis. TRP Choose to decompose the recommendations individually. The UE determines whether the CSI ports for each TRP are configured to the same CSI-RS resource. If the UE determines that the CSI ports for each TRP are configured to the same CSI-RS resource, it uses a common FD basis across the TRPs to determine the W in the FD. TRPIf you choose to perform joint decomposition across recommendations and determine that the CSI ports for each TRP are not configured to the same CSI-RS resource, then, based on the channel-specific FD basis, each W in the FD will be... TRP Choose to break down the recommendations into individual components.

[0033]

[0037] In some examples, UE is based on one or more SD bases and one or more FD bases, with W in both SD and FD. TRP The UE's ability to selectively decompose recommendations into SD and FD coefficients is reported to the network / base station.

[0034]

[0038] The technology disclosed herein includes methods, apparatus, and computer-readable media for wireless communication, including instructions, from the perspective of a network / base station. In some examples, the network / base station uses a precoder (W) based on one or more SD bases and one or more FD bases known to both the UE and the network / base station. TRP The spatial domain (SD) and frequency domain (FD) coefficients describing the recommended decomposed set are received from each of the multiple UEs receiving transmissions from multiple TRPs in the network. TRP The recommendation is to use channel characteristics H measured in the UE. TRP Based on the corresponding set, the network / base station determines a precoder for each such UE based on the received SD coefficient, the received FD coefficient, and known bases. The network / base station then precodes one or more communications from the network to each such UE using the corresponding determined precoder.

[0035]

[0039] In some such examples, the network / base station uses one or more SD bases and one or more FD bases known to both the network / base station and one or more such UEs, with W in both SD and FD. TRPThe recommendation is to send UE-specific settings to one or more such UEs for the UE to selectively decompose the UE into SD and FD coefficients. In such an example, the network receives subsequent SD and FD coefficients based on the transmitted UE-specific settings. In some such examples, transmitting includes transmitting in an RRC message.

[0036]

[0040] To achieve the objectives described above and related objectives, one or more embodiments include features that are fully described below and, in particular, pointed out in the claims. The following description and accompanying drawings detail specific exemplary features of one or more embodiments. However, these features represent only a small fraction of the various schemes that can employ the principles of various embodiments, and this description is intended to include all such embodiments and their equivalents.

[0037]

[0041] Herein, several embodiments of telecommunications systems are shown with respect to various devices and methods. These devices and methods are described in the following detailed description and are shown in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (referred to as “elements”). These elements can be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. For example, an element, or any part of an element, or any combination of elements, can be implemented as a “processing system” including 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 a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gate logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. One or more processors in a processing system can execute software.Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise, should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on.

[0038]

[0042] Accordingly, in one or more exemplary embodiments, the functions described may be implemented in hardware, software, or any combination thereof. When implemented in software, these functions may be stored or encoded on a computer-readable medium as one or more instructions or codes. The computer-readable medium includes computer storage media. The storage medium may be any available medium accessible by a computer. Such computer-readable media may include, but not limited to, 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 the computer-readable media of the above types, or any other medium that can be used to store computer executable code in the form of instructions or data structures accessible by a computer.

[0039]

[0043] Figure 1 shows an example of a wireless communication system and access network 100. The wireless communication system (also called a wireless wide area network (WWAN)) includes a base station 102, a UE 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)). The base station 102 may include macrocells (high-power cellular base stations) and / or small cells (low-power cellular base stations). Macrocells include base stations. Small cells include femtocells, picocells, and microcells. A base station 102 configured for 4G LTE (collectively, an evolved universal terrestrial radio access network (E-UTRAN)) may interface with the EPC 160 through a first backhaul link 132 (e.g., an S1 interface). A base station 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with the core network 190 through a second backhaul link 186.In addition to other functions, base stations 102 can perform one or more of the following functions: user data transfer, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment tracking, RAN information management (RIM), paging, positioning, and warning message distribution. Base stations 102 can communicate with each other directly or indirectly (e.g., through EPC 160 or core network 190) via a third backhaul link 134 (e.g., X2 interface). The first backhaul link 132, the second backhaul link 186, and the third backhaul link 134 may be wired or wireless.

[0040]

[0044] Base station 102 can communicate wirelessly with UE 104. Each base station 102 can provide communication coverage to its respective geographical coverage area 110. Overlapping geographical coverage areas 110 may exist. For example, a small cell 102' may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network containing both small cells and macro cells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) that are capable of serving restricted groups known as closed subscriber groups (CSGs). The communication link 120 between the base station 102 and the UE 104 may include uplink (UL) transmissions (also called reverse link) from the UE 104 to the base station 102, and / or downlink (DL) transmissions (also called forward link) from the base station 102 to the UE 104. The communication link 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. In some examples of the technology disclosed herein, both the DL and UL between the base station and the UE use the same set of multiple beams to transmit and receive physical channels. For example, a given set of beams may carry multiple copies of a Physical Downlink Shared Channel (PDSCH) on the DL and multiple copies of a Physical Uplink Control Channel (PUCCH) on the UL.

[0041]

[0045] A communication link may be via one or more carriers. Base station 102 / UE104 may use a spectrum with a maximum bandwidth of Y MHz per carrier (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.) allocated in a carrier aggregation of a total of up to Yx MHz (x component carriers) used for transmission in each direction. Carriers may be adjacent or not adjacent to each other. Carrier allocation may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated with respect to DL than to UL). Component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be called a primary cell (PCell), and a secondary component carrier may be called a secondary cell (SCell).

[0042]

[0046] Certain UE104s may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL / UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as the physical sidelink broadcast channel (PSBCH), physical sidelink discovery channel (PSDCH), physical sidelink shared channel (PSSCH), and physical sidelink control channel (PSCCH). D2D communication may be via various wireless D2D communication systems, such as FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0043]

[0047] In aspects of the technology disclosed herein, the recommended precoder matrix W TRP A method, a non-transient computer-readable medium, and an apparatus are provided for reporting to a network / base station and for configuring UE104 for such reporting. Such a technique is used when UE104 receives transmissions from multiple transmit / receive points (TRPs) of the network / base station 102.

[0044]

[0048] In examples of such technologies, such as the UE Precoder Recommended Component 142, UE104 determines the channel characteristic H for each such TRP and UE104. TRP Determine the set of H. Then, UE104 determines the corresponding H TRP Based on this, a precoder (W) for each such channel. TRP) Determine the recommended set. Based on one or more SD basis and one or more FD basis, the UE104 determines the W in both the spatial domain (SD) and the frequency domain (FD). TRP The recommendation is selectively decomposed into SD coefficients and FD coefficients. Then, UE104 transmits the spatial domain coefficients and frequency domain coefficients to the network / base station 102.

[0045]

[0049] In some cases, selective decomposition is i) based on a common SD basis matrix across TRP, W in SD TRP Joint decomposition across recommendations, and based on a common FD basis matrix across TRP, W in FD TRP ii) Joint decomposition across recommendations, and based on a common SD basis matrix across TRP, W in SD TRP Joint decomposition is performed across recommendations, and each W in FD is determined based on the channel-specific FD basis matrix. TRP iii) Decompose the recommendations individually, each W in the SD on the channel-specific SD basis matrix TRP The recommendations are individually decomposed, and based on a common FD basis matrix across TRPs, W in FD TRP Recommended joint decomposition across the recommendations, and iv) each W in the SD on the channel-specific SD basis matrix. TRP The recommendations are individually decomposed, and each W in FD is determined based on the channel-specific FD basis matrix. TRP This includes one of the following: breaking down recommendations into their individual components.

[0046]

[0050] In some cases, UE104 uses one of i), ii), iii), and iv) before selectively decomposing W TRP The network / base station 102 receives instructions for selectively decomposing a recommendation. In such examples, selective decomposition involves selectively decomposing according to the received instructions. In some such examples, the instructions are received by the UE 104 via an RRC message from the network / base station 102 to the UE.

[0047]

[0051] In some cases, decomposition is selected by UE104. In some such cases, UE104 selects each W in SD on a channel-specific SD basis. TRP Choose to decompose the recommendations individually. UE104 determines whether the CSI ports for each TRP (e.g., in a base station such as base station 102) are configured to the same CSI-RS resource. If UE104 determines that the CSI ports for each TRP are configured to the same CSI-RS resource, then, based on a common FD basis across the TRPs, W in FD TRP If you choose to perform joint decomposition across recommendations and determine that the CSI ports for each TRP are not configured to the same CSI-RS resource, then, based on the channel-specific FD basis, each W in the FD will be... TRP Choose to break down the recommendations into individual components.

[0048]

[0052] In some examples, UE104 is based on one or more SD bases and one or more FD bases, with W in both SD and FD. TRP The network reports UE104's ability to selectively decompose recommendations into SD coefficients and FD coefficients.

[0049]

[0053] The wireless communication system may further include Wi-Fi access points (APs) that communicate with Wi-Fi stations (STAs) 152 via a communication link 154 in the 5 GHz unlicensed frequency spectrum. When communicating in the unlicensed frequency spectrum, the STAs 152 / APs may perform a clear channel assessment (CCA) before communication to determine whether a channel is available. Small cells 102' can operate in the licensed frequency spectrum and / or the unlicensed frequency spectrum. When operating in the unlicensed frequency spectrum, small cells 102' may employ NR and use the same 5 GHz unlicensed frequency spectrum used by the Wi-Fi APs. By employing NR in the unlicensed frequency spectrum, small cells 102' can enhance coverage to the access network and / or increase the capacity of the access network.

[0050]

[0054] Base station 102 may include and / or be referred to as an eNB, g-node B (gNB), or other type of base station, whether it is a small cell 102' or a large cell (e.g., a macro base station). Some base stations, such as gNB 180, may operate in one or more frequency bands within the electromagnetic spectrum. Base station 180 and UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming.

[0051]

[0055] The electromagnetic spectrum is often subdivided into various classes, bands, channels, etc., based on frequency / wavelength. In 5G NR, two initial operating bands are defined as frequency range designations FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz). Frequencies between FR1 and FR2 are often called intermediate band frequencies. Although a portion of FR1 is above 6 GHz, FR1 is often referred to (interchangeably) as the "sub-6 GHz" band in various documents and papers. A similar nomenclature issue arises with FR2, which is often referred to (interchangeably) as the "millimeter wave" (mmW) band in documents and papers, even though FR2 is different from the extremely high frequency (EHF) band (30 GHz to 300 GHz) defined as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0052]

[0056] With the above aspects in mind, unless otherwise specified, terms such as "sub-6GHz" may broadly refer to frequencies that may be below 6GHz, frequencies that may be within FR1, or frequencies that may include intermediate band frequencies, as used herein. Furthermore, unless otherwise specified, terms such as "millimeter wave" may broadly refer to frequencies that may include intermediate band frequencies, frequencies that may be within FR2, or frequencies that may be within the EHF band, as used herein. Communications using the mmW radio frequency band have extremely high path loss and short communication ranges. The mmW base station 180 may utilize beamforming with UE104 / 184 to compensate for path loss and short communication ranges using beam 182.

[0053]

[0057] Base station 180 may transmit beamformed signals in one or more transmission directions 182' to UE104 / 184. UE104 / 184 may receive beamformed signals from base station 180 in one or more reception directions 182''. UE104 / 184 may also transmit beamformed signals in one or more transmission directions to base station 180. Base station 180 may receive beamformed signals from UE104 in one or more reception directions. Base station 180 / UE104 / 184 may perform beam training to determine the best reception and transmission directions for each of them. The transmission and reception directions for base station 180 may be the same or different. The transmission and reception directions for UE104 / 184 may be the same or different.

[0054]

[0058] EPC160 may include a Mobility Management Entity (MME) 162, another MME 164, a serving gateway 166, a Multimedia Broadcast Multicast Service (MBMS) gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) gateway 172. MME 162 can communicate with the Home Subscriber Server (HSS) 174. MME 162 is a control node that handles signaling between the UE 104 and EPC160. Generally, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are forwarded through the serving gateway 166, which is itself connected to the PDN gateway 172. The PDN gateway 172 provides IP address assignment for the UE, as well as other functions. The PDN gateway 172 and BM-SC 170 are connected to the IP service 176. IP service 176 may include the Internet, intranet, IP Multimedia Subsystem (IMS), packet-switched (PS) streaming services, and / or other IP services. BM-SC170 can provide functions for provisioning and delivering MBMS user services. BM-SC170 can act as an entry point for MBMS transmissions by content providers, can be used to authorize and initiate MBMS bearer services within a public land mobile network (PLMN), and can be used to schedule MBMS transmissions.The MBMS gateway 168 can be used to distribute MBMS traffic to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area that broadcasts specific services, and can be responsible for session management (start / stop) and collecting eMBMS-related billing information.

[0055]

[0059] The core network 190 may include an Access and Mobility Management Function (AMF) 192, another AMF 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. AMF 192 can communicate with Unified Data Management (UDM) 196. AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. Generally, AMF 192 provides quality of service (QoS) flow and session management. All user Internet Protocol (IP) packets are forwarded through UPF 195. UPF 195 provides IP address assignment for the UE and other functions. UPF 195 is connected to IP service 197. IP service 197 may include the Internet, intranet, IP multimedia subsystem (IMS), PS streaming service, and / or other IP services.

[0056]

[0060] A base station includes and / or may be referred to as a gNB, node B, eNB, access point, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmit / receive point (TRP), or other preferred terminology. Base station 102 provides an access point to EPC 160 or core network 190 to UE 104. Examples of UE 104 include cellular phones, smartphones, 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 devices, implants, sensors / actuators, displays, or any other similar functional devices. Some of the UE104s (e.g., parking meters, gas pumps, toasters, vehicles, cardiac monitors, etc.) may be called IoT devices. The UE104 may also be called a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or any other suitable term.

[0057]

[0061] The technology disclosed herein includes methods, apparatus, and computer-readable media for wireless communication, including instructions, from the perspective of the network / base station 102. In some examples, the network / base station 102 uses a precoder (W) based on one or more SD bases and one or more FD bases known to both the UE 104 and the network / base station 102. TRP The spatial domain (SD) coefficients and frequency domain (FD) coefficients describing the recommended decomposed set are received from each of the multiple UEs 104 that receive transmissions from multiple TRPs of the network / base station 102. TRP The recommendation is to use the channel characteristics H measured in UE104. TRP This is based on a corresponding set. The network / base station 102 determines a precoder for each such UE 104 based on the received SD coefficient, the received FD coefficient, and a known basis. The network base station 102 then precodes one or more communications from the network base station 102 to each such UE 104 using the corresponding determined precoder.

[0058]

[0062] In some such examples, the network / base station 102 is based on one or more SD bases and one or more FD bases known to both the network / base station 102 and one or more such UE 104, and W in both SD and FD. TRP The recommendation is to send UE-specific settings to one or more such UE104s for selective decomposition into SD and FD coefficients by the UE104s. In such examples, the network receives subsequent SD and FD coefficients based on the transmitted UE-specific settings. In some such examples, transmitting includes transmitting in an RRC message.

[0059]

[0063] While the following description may focus on 5G NR, the concepts described herein may be applicable to other similar fields, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0060]

[0064] The deployment of communication systems, such as 5G New Radio (NR) systems, can be configured in numerous ways using various components or parts. In a 5G NR system or network, network equipment such as network nodes, network entities, network mobility elements, radio access network (RAN) nodes, core network nodes, network elements, or base stations (BS), or one or more units (or one or more components) that perform base station functions, can be implemented in an aggregated or distributed architecture. For example, a BS (such as Node B (NB), Advanced NB (eNB), NR BS, 5G NB, access point (AP), transceiver point (TRP), or cell) can be implemented as an aggregated base station (also known as a standalone BS or monolithic BS) or a distributed base station.

[0061]

[0065] Aggregated base stations may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node. Distributed base stations may be configured to utilize a protocol stack that is physically or logically distributed among two or more units (such as one or more centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs)). In some embodiments, CUs may be implemented within a RAN node, and one or more DUs may be co-located with CUs, or alternatively, geographically or virtually distributed across one or more other RAN nodes. DUs may be implemented to communicate with one or more RUs. Each of CUs, DUs, and RUs may also be implemented as a virtual unit, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0062]

[0066] Base station operation or network design may take into account the aggregated characteristics of base station functions. For example, distributed base stations can be used in integrated access backhaul (IAB) networks, open radio access networks (O-RAN, such as network configurations supported by the O-RAN Alliance), or virtualized radio access networks (vRAN, also known as cloud radio access networks, or C-RAN). Distribution may include distributing functions across two or more units in various physical locations, as well as virtually distributing functions for at least one unit, which can allow for flexibility in network design. Various units of a distributed base station, or a distributed RAN architecture, can be configured for wired or wireless communication with at least one other unit.

[0063]

[0067] Figure 2 shows a diagram illustrating an exemplary distributed base station 200 architecture. The architecture of the distributed base station 200 may include one or more central units (CUs) 210 that can communicate directly with the core network 220 via backhaul links, or indirectly with the core network 220 via one or more distributed base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 225 via an E2 link, or a Non-Real Time (Non-RT) RIC 215 associated with a Service Management and Orchestration (SMO) framework 205, or both). The CUs 210 can communicate with one or more distributed units (DUs) 230 via their respective midhaul links, such as an F1 interface. The DUs 230 can communicate with one or more radio units (RUs) 240 via their respective fronthaul links. The RU240 can communicate with each UE104 via one or more radio frequency (RF) access links. In some implementations, the UE104 may be serviced simultaneously by multiple RU240s.

[0064]

[0068] Each of the units, namely CU210, DU230, RU240, and the quasi-RT RIC225, non-RT RIC215, and SMO framework 205, may include, or be coupled to, one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) over a wired or wireless transmission medium. Each of the units, or an associated processor or controller that provides instructions to the communication interface of a unit, may be configured to communicate with one or more other units over a transmission medium. For example, a unit may include a wired interface configured to receive or transmit signals to one or more other units over a wired transmission medium. In addition, a unit may include a wireless interface that may include a receiver, transmitter, or transceiver (such as a radio frequency (RF) transceiver) configured to receive or transmit signals to one or more other units over a wireless transmission medium, or to both receive and transmit.

[0065]

[0069] In some embodiments, the CU210 can 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 implement an interface configured to communicate signals with other control functions hosted by the CU210. The CU210 may be configured to handle user plane functions (i.e., Central Unit-User Plane, CU-UP), control plane functions (i.e., Central Unit-Control Plane, CU-CP), or a combination thereof. In some implementations, the CU210 can be logically divided into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP units can communicate bidirectionally with the CU-CP units via an interface such as the E1 interface. The CU210 can be implemented to communicate with the DU230 as needed for network control and signaling.

[0066]

[0070] The DU230 may correspond to a logic unit containing one or more base station functions for controlling the operation of one or more RU240s. In some embodiments, the DU230 may host one or more of the following, at least in part, depending on a functional decomposition such as that defined by the Third Generation Partnership Project (3GPP): a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more upper physical (PHY) layers (such as modules for forward error correction (FEC) coding and decoding, scrambling, modulation and demodulation). In some embodiments, the DU230 may further host one or more lower PHY layers. Each layer (or module) may implement an interface configured to communicate signals with other layers (and modules) hosted by the DU230, or with control functions hosted by the CU210.

[0067]

[0071] Lower-layer functions can be implemented by one or more RU240s. In some deployments, RU240s controlled by DU230s may correspond to logical nodes hosting RF processing functions, or lower 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, at least partially based on functional partitioning such as lower-layer functional partitioning. In such architectures, RU(s)240s can be implemented to handle over-the-air (OTA) communication with one or more UE104s. In some implementations, real-time and non-real-time modes of control plane communication and user plane communication with RU(s)240s can be controlled by the corresponding DU230s. In some scenarios, this configuration allows DU(s)230 and CU210 to be implemented in cloud-based RAN architectures such as vRAN architectures.

[0068]

[0072] The SMO framework 205 can be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO framework 205 can be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which can be managed via an operation and maintenance interface (such as the O1 interface). For virtualized network elements, the SMO framework 205 can be configured to interact with a cloud computing platform (such as the open cloud (O-Cloud) 290) and perform network element lifecycle management (such as instantiating virtualized network elements) via a cloud computing platform interface (such as the O2 interface). Such virtualized network elements may include, but are not limited to, the CU210, DU230, RU240, and the quasi-RT RIC225. In some implementations, the SMO framework 205 can communicate with hardware embodiments of the 4G RAN, such as the open eNB (O-eNB) 211, via the O1 interface. In addition, in some implementations, the SMO framework 205 can communicate directly with one or more RU240s via the O1 interface. The SMO framework 205 may also include a non-RT RIC215 configured to support the functionality of the SMO framework 205.

[0069]

[0073] Non-RT RIC215 may be configured to include logical functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updating, or policy-based guidance for applications / features in quasi-RT RIC225. Non-RT RIC215 may be coupled to quasi-RT RIC225 or communicate with quasi-RT RIC225 (e.g., via the A1 interface). Quasi-RT RIC225 may be configured to include logical functions that enable quasi-real-time control and optimization of RAN elements and resources via data acquisition and actions via an interface connecting one or more CU210s, one or more DU230s, or both, and the O-eNB to quasi-RT RIC225 (e.g., via the E2 interface).

[0070]

[0074] In some implementations, non-RT RIC215 may receive parameter or external enrichment information from an external server to generate AI / ML models that will be deployed to quasi-RT RIC225. Such information may be available to quasi-RT RIC225 and may be received in the SMO framework 205 or non-RT RIC215 from non-network data sources or network functions. In some examples, non-RT RIC215 or quasi-RT RIC225 may be configured to tune RAN behavior or performance. For example, non-RT RIC215 may monitor long-term trends and patterns in performance and employ AI / ML models to take corrective action via the SMO framework 205 (e.g., reconfiguration via O1) or by creating RAN management policies (e.g., A1 policies).

[0071]

[0075] Figure 3A is Figure 300, which shows an example of a first subframe in a 5G / NR frame configuration. Figure 3B is Figure 330, which shows an example of a DL channel in a 5G / NR subframe. Figure 3C is Figure 350, which shows an example of a second subframe in a 5G / NR frame configuration. Figure 3D is Figure 380, which shows an example of a UL channel in a 5G / NR subframe. A 5G / NR frame configuration can be frequency-division duplex (FDD) where, with respect to a specific set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to either DL or UL, or it can be time-division duplex (TDD) where, with respect to a specific set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to both DL and UL. In the examples provided in Figures 3A and 3C, the 5G / NR frame configuration is assumed to be TDD, with subframe 4 consisting of slot format 28 (mostly DL), where D is DL, U is UL, and X is flexible for use between DL and UL, and subframe 3 consisting of slot format 34 (mostly UL). Although subframes 3 and 4 are shown in slot formats 34 and 28 respectively, any particular subframe can be composed of any of the various available slot formats 0 to 61. Slot formats 0 and 1 are all DL and all UL, respectively. The other slot formats 2 to 61 include a mixture of DL symbols, UL symbols, and flexible symbols. The UE is configured using the slot format (dynamically via DL control information (DCI) or semi-statically / statically via radio resource control (RRC) signaling) through the received slot format indicator (SFI). Please note that the following explanation also applies to the TDD 5G / NR frame configuration.

[0072]

[0076] Other wireless communication technologies may have different frame configurations and / or different channels. A frame (10 ms) can be divided into 10 subframes (1 ms) of equal size. Each subframe may contain one or more time slots. A subframe may also contain minislots that may contain 7, 4, or 2 symbols. Each slot may contain 7 or 14 symbols depending on the slot configuration. In slot configuration 0, each slot may contain 14 symbols, and in slot configuration 1, each slot may contain 7 symbols. Symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL can be CP-OFDM symbols (in high-throughput scenarios) or Discrete Fourier Transform (DFT) Spread OFDM (DFT-s-OFDM) symbols (also called Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols) (in power-limited scenarios, i.e., when limited to single-stream transmission). The number of slots within a subframe depends on the slot configuration and numerology. Slot configuration 0 allows 1, 2, 4, 8, 16, and 32 slots per subframe, respectively, for different numerologies μ, 0-5. Slot configuration 1 allows 2, 4, and 8 slots per subframe, respectively, for different numerologies 0-2. Therefore, slot configuration 0 and numerology μ allow 14 symbols / slot and 2 μ There are 1 slot / subframe. Subcarrier interval and symbol length / duration are functions of numerology. The subcarrier interval is 2 μ*This can be equal to 15 kHz, where μ is numerology 0 to 5. Therefore, numerology μ=0 has a subcarrier interval of 15 kHz, and numerology μ=5 has a subcarrier interval of 480 kHz. The symbol length / duration is inversely proportional to the subcarrier interval. Figures 3A to 3D show examples of slot configuration 0, which has 14 symbols per slot, and numerology μ=2, which has 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier interval is 60 kHz, and the symbol duration is approximately 16.67 μs.

[0073]

[0077] A resource grid can be used to represent the frame structure. Each time slot contains resource blocks (RBs) (also called physical RBs, PRBs) spanning 12 consecutive subcarriers. The resource grid is divided into numerous resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0074]

[0078] As shown in Figure 3A, some of the REs carry a reference (pilot) signal (RS) for the UE. The RS is used for channel estimation in the UE, and is a demodulation RS (DM-RS) (in certain configurations, R xIt is shown as such, where 100x is the port number, but other DM-RS configurations are possible), and may include a channel status information reference signal (CSI-RS). RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS). Some examples of the techniques disclosed herein use DM-RS of a physical downlink control channel (PDCCH) to assist in channel estimation (and final demodulation of the user data portion) of a physical downlink shared channel (PDSCH).

[0075]

[0079] Figure 3B shows an example of various DL channels within a frame subframe. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE containing nine RE groups (REGs), and each REG containing four consecutive REs within one OFDM symbol. A primary synchronization signal (PSS) may be present within symbol 2 of a particular subframe of the frame. The PSS is used by UE104 to determine the timing of the subframe / symbol and the physical layer identification information. A secondary synchronization signal (SSS) may be present within symbol 4 of a particular subframe of the frame. The SSS is used by the UE to determine the group number of the physical layer cell identification information and the timing of the radio frame. Based on the physical layer identification information and the group number of the physical layer cell identification information, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the DM-RS described above. A physical broadcast channel (PBCH) carrying a master information block (MIB) can be logically grouped with PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides the number of RBs within the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data and broadcast system information not transmitted through the PBCH and paging messages, such as system information blocks (SIBs).

[0076]

[0080] As shown in Figure 3C, some REs carry DM-RS (shown as R in one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. UEs may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). PUSCH DM-RS may be transmitted within the first one or two symbols of the PUSCH. PUCCH DM-RS may be transmitted in different configurations depending on whether a short or long PUCCH is transmitted, and depending on the specific PUCCH format used. UEs may transmit sounding reference signals (SRS). SRS may be transmitted within the last symbol of a subframe. SRS may have a comb-like structure, and UEs may transmit SRS in one of these comb teeth. SRS may be used by base stations for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0077]

[0081] Figure 3D shows an example of various UL channels within a frame subframe. PUCCHs can be arranged as shown in one configuration. PUCCHs carry uplink control information (UCI), such as scheduling requests, channel quality indicators (CQI), pre-coding matrix indicators (PMI), rank indicators (RI), and hybrid automatic repeat request (HARQ) acknowledgment (ACK) / negative ACK (NACK) feedback. PUCCHs carry data and may additionally carry buffer status reports (BSR), power headroom reports (PHR), and / or UCI.

[0078]

[0082] Figure 4 is a block diagram showing base station 410 communicating with UE450 in the access network. In DL, IP packets from EPC160 can be provided to controller / processor 475. Controller / processor 475 implements Layer 3 and Layer 2 functions. Layer 3 includes the Radio Resource Control (RRC) layer, and Layer 2 includes the Service Data Adaptive Protocol (SDAP) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and Medium Access Control (MAC) layer. The controller / processor 475 includes RRC layer functions associated with broadcasting system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection correction, and RRC connection release), mobility between radio access technologies (RATs), and measurement settings for UE measurement reporting; PDCP layer functions associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with forwarding upper-layer packet data units (PDUs), error correction via ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), resegmentation of RLC data PDUs, and reordering of RLC data PDUs; mapping between logical channels and transport channels, multiplexing MAC SDUs onto transport blocks (TBs), and MAC from TBs. It provides MAC layer functions associated with SDU demultiplexing, scheduling information reporting, error correction via HARQ, priority processing, and logical channel prioritization.

[0079]

[0083] The transmit (TX) processor 416 and the receive (RX) processor 470 implement Layer 1 functions associated with various signal processing functions. Layer 1, including 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 to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 416 processes mapping to a signal constellation based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols can then be divided into parallel streams. Next, each stream can be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., a pilot) in the time domain and / or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to generate a physical channel that carries the time-domain OFDM symbol stream. The OFDM stream is spatially precoded to generate multiple spatial streams. The channel estimate from the channel estimator 474 can be used to determine the coding and modulation schemes, and for spatial processing. The channel estimate can be derived from the reference signal and / or channel state feedback transmitted by the UE 450. Each spatial stream can then be provided to different antennas 420 via separate transmitters 418TX. Each transmitter 418TX can modulate a radio frequency (RF) carrier over its respective spatial stream for transmission.

[0080]

[0084] From the perspective of base station 410, the technology disclosed herein includes methods, apparatus, and computer-readable media for wireless communication, including instructions. In some examples, base station 410 uses a precoder (W) based on one or more SD bases and one or more FD bases known to both UE 450 and base station 410. TRP The spatial domain (SD) and frequency domain (FD) coefficients describing the recommended decomposed set are received from each of the multiple UE450s that receive transmissions from multiple TRPs of base station 410. TRP The recommendation is the channel characteristic H measured on the UE450. TRP This is based on a corresponding set. The base station 410 determines a precoder for each such UE450 based on the received SD coefficient, the received FD coefficient, and a known basis. The base station 410 then precodes one or more communications from the base station 410 (e.g., from its associated TRP) to each such UE450 using the corresponding determined precoder.

[0081]

[0085] In some such examples, base station 410 uses one or more SD bases and one or more FD bases known to both base station 410 and one or more such UE450, and W in both SD and FD. TRP The recommendation is to send to one or more UE450s a UE-specific configuration for which the UE450 selectively decomposes the UE450 into SD and FD coefficients. In such an example, the base station 410 receives the subsequent SD and FD coefficients based on the transmitted UE-specific configuration. In some such examples, the transmission includes sending in a Radio Resource Configuration (RRC) message.

[0082]

[0086] The base station 410 can perform the operations described above by using the base station / network precoder components 144, which cooperate with or are hosted within one or more of the TX processor 416, RX processor 470, channel estimator 474, controller / processor 475, and memory 476.

[0083]

[0087] In UE450, each receiver 454RX receives signals through its respective antenna 452. Each receiver 454RX reconstructs the information modulated on the RF carrier and provides this information to the receiver (RX) processor 456. The TX processor 468 and RX processor 456 implement Layer 1 functions associated with various signal processing functions. The RX processor 456 can perform spatial processing on the information to reconstruct any spatial stream destined for UE450. If multiple spatial streams are destined for UE450, the RX processor 456 can synthesize them into a single OFDM symbol stream. The RX processor 456 then uses a Fast Fourier Transform (FFT) to convert the OFDM symbol stream from the time domain to the frequency domain. The frequency domain signal contains a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbol and reference signals on each subcarrier are reconstructed and demodulated by determining the most likely signal constellation point transmitted by the base station 410. These soft decisions can be obtained based on channel estimates calculated by the channel estimator 458. The soft decisions are then decoded and deinterleaved to reconstruct the data and control signals initially transmitted on the physical channel by the base station 410. The data and control signals are then provided to the controller / processor 459, which implements Layer 3 and Layer 2 functions.

[0084]

[0088] The controller / processor 459 may be associated with memory 460 that stores program code and data. Memory 460 may be referred to as computer-readable media. In UL, the controller / processor 459 provides demultiplexing between transport and logical channels, packet reassembly, decoding, header decompression, and control signal processing to recover IP packets from the EPC160. The controller / processor 459 also plays a role in error detection using the ACK and / or NACK protocols to support HARQ operation.

[0085]

[0089] Similar to the functions described in relation to DL transmission by base station 410, the controller / processor 459 provides RRC layer functions associated with acquiring system information (e.g., MIB, SIB), RRC connection, and measurement reporting; PDCP layer functions associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functions associated with transferring upper-layer PDUs, error correction via ARQ, concatenation, segmentation, and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and sorting of RLC data PDUs; and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto TBs, demultiplexing MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority processing, and logical channel prioritization.

[0086]

[0090] The channel estimate derived by the channel estimator 458 from a reference signal or feedback transmitted by the base station 410 can be used by the TX processor 468 to select an appropriate coding and modulation scheme and to facilitate spatial processing. The spatial stream generated by the TX processor 468 can be provided to different antennas 452 via a separate transmitter 454TX. Each transmitter 454TX can modulate the RF carrier in its respective spatial stream for transmission.

[0087]

[0091] UL transmission is processed at base station 410 in a manner similar to that described in relation to the receiver function in UE450. Each receiver 418RX receives the signal through its respective antenna 420. Each receiver 418RX reconstructs the information modulated on the RF carrier and provides this information to RX processor 470.

[0088]

[0092] The controller / processor 475 may be associated with memory 476 for storing program code and data. Memory 476 may be referred to as computer-readable media. In UL, the controller / processor 475 provides demultiplexing between transport and logical channels, packet reassembly, decoding, header decompression, and control signal processing to recover IP packets from the UE450. IP packets from the controller / processor 475 may be supplied to the EPC160. The controller / processor 475 also plays a role in error detection using the ACK and / or NACK protocols to support HARQ operation. As described elsewhere in this specification, the interface between the UE450 and the base station 410 may be referred to as the "Uu" interface 490.

[0089]

[0093] Continuing to refer to Figure 4, and continuing to refer to the previous figure for context, in some embodiments, the technology disclosed herein is a computer-readable medium including methods, apparatus, and instructions for wireless communication. In embodiments of the technology disclosed herein, the recommended precoder matrix W TRP A method, a non-transient computer-readable medium, and an apparatus are provided for reporting to a network / base station and for configuring UE450 for such reporting. Such a technique is used when UE450 receives transmissions from multiple TRPs of network / base station 410.

[0090]

[0094] In examples of such technologies, such as the UE precoder recommended component 142, the UE450 determines the channel characteristics H for each such TRP of the base station 410 and the UE450. TRP Determine the set. Then, the UE450 will determine the corresponding H TRP Based on this, a precoder (W) for each such channel. TRP ) Determine the recommended set. Based on one or more SD basis and one or more FD basis, the UE450 determines the W in both the spatial domain (SD) and frequency domain (FD). TRPThe preference is selectively decomposed into an SD coefficient and an FD coefficient. Then, the UE 450 transmits the spatial domain coefficient and the frequency domain coefficient to the base station 410.

[0091]

[0095] In some examples, selectively decomposing involves i) jointly decomposing the preference over the TRP and, based on a common SD basis matrix across the TRP, the W in SD TRP jointly decomposing the preference over the TRP and, based on a common FD basis matrix across the TRP, the W in FD TRP jointly decomposing the preference over the TRP and, based on a common SD basis matrix across the TRP, the W in SD TRP jointly decomposing the preference over the TRP and, based on a channel-specific FD basis matrix, each W in FD TRP individually decomposing the preference, iii) on a channel-specific SD basis matrix, each W in SD TRP individually decomposing the preference and, based on a common FD basis matrix across the TRP, the W in FD TRP jointly decomposing the preference over the TRP and, iv) on a channel-specific SD basis matrix, each W in SD TRP individually decomposing the preference and, based on a channel-specific FD basis matrix, each W in FD TRP individually decomposing the preference, and includes one of the following:

[0092]

[0096] In some examples, before selectively decomposing, the UE 450 uses one of i), ii), iii), and iv) to decompose W TRP receives an instruction from the base station 410 (e.g., from the TRP via the channel) for selectively decomposing the preference. In such examples, selectively decomposing includes selectively decomposing according to the received instruction. In some such examples, the instruction is received by the UE 450 via a radio resource control (RRC) message from the base station 410 to the UE.

[0093]

[0097] In some examples, the decomposition is selected by the UE 450. In some such examples, the UE 450 decomposes each W in SD on a channel-specific SD basis TRPChoose to decompose the recommendations individually. The UE450 determines whether the CSI ports for each TRP (e.g., in a base station such as base station 410) are configured to the same CSI-RS resource. If the UE450 determines that the CSI ports for each TRP are configured to the same CSI-RS resource, it determines the W in the FD based on a common FD basis across the TRPs. TRP If you choose to perform joint decomposition across recommendations and determine that the CSI ports for each TRP are not configured to the same CSI-RS resource, then, based on the channel-specific FD basis, each W in the FD will be... TRP Choose to break down the recommendations into individual components.

[0094]

[0098] In some examples, UE450 is based on one or more SD bases and one or more FD bases, with W in both SD and FD. TRP The ability of UE450 to selectively decompose the recommendation into SD coefficients and FD coefficients is reported to base station 410.

[0095]

[0099] The UE450 can perform the operations described above by working with one or more of the TX processor 468, RX processor 456, channel estimator 458, controller / processor 459, and memory 460, or by using the UE precoder component 142 which is hosted within these components.

[0096]

[0100] Referring to Figure 5, and continuing to refer to the previous figure for context, a method 500 for wireless communication is shown by example of the technology disclosed herein. In such a method, a network UE receives a transmission from a network TRP. The UE determines the channel characteristics H for each such TRP and UE. TRPThe set of blocks 510 determines the set of CSI-RS. In the following example, UE450 receives coherent joint transmissions from the TRP of the network across several base stations 410. The UE uses channel estimator 458 to determine the channel characteristics H for each channel between UE450 and the TRP based on receiving CSI-RS from the TRP of base stations 410. TRP Determine the set.

[0097]

[0101] Referring to Figure 9, and continuing to refer to the previous figure for context, another representation of a UE450 (such as UE104a) for wireless communication is shown by example of the technology disclosed herein. The UE450 includes a UE precoder recommendation component 142, a controller / processor 459, and memory 460, as described above in relation to Figure 4. The UE precoder recommendation component 142 includes a decision component 142a. In some examples, the decision component 142a determines the channel characteristic H for each such channel between the TRP and the UE. TRP The set of determination components 142a determines the channel characteristics H for each such channel between TRP and UE. TRP This may provide a means for determining the set of

[0098]

[0102] Referring again to Figure 5, UE corresponds to H TRP Based on this, a precoder (W) for each such channel. TRP ) Determine the recommended set - block 520. In the following example, UE450 is H TRP Based on this, we determine the vector shown in equation (5).

[0099]

number

[0100]

[0103] Referring to Figure 9, and continuing to refer to the previous figure for context, the UE precoder recommendation component 142 includes a second decision component 142b. In some examples, the second decision component 142b is the corresponding HTRP Based on this, W for each such channel TRP Determine the recommended set. Therefore, the second decision component 142b is the corresponding H TRP Based on this, a precoder W for each such channel TRP This may provide a means to determine the recommended set.

[0101]

[0104] Referring again to Figure 5, the UE is based on one or more SD basis and one or more FD basis, and is W in both the spatial domain (SD) and the frequency domain (FD). TRP Selectively decompose the recommendation into SD coefficients and FD coefficients - Block 530. In the following example, UE450 is calculated based on a common SD basis matrix across TRP, as shown in Equation (6), for W in SD. TRP Joint decomposition across recommendations, and based on a common FD basis matrix across TRP, W in FD TRP Disassemble the joints in the recommended order. In practice, SD disassembly is often done first, but this order is not mandatory.

[0102]

number

[0103]

[0105] In formula (6), W s This is a common set of spatial domain (SD) basis that applies to both TRPs, and W 1,TPR1 and W 1,TPR2 These are the broadband SD coefficients of TRP1 and TRP2, respectively, and W t,TPR1 and W t,TPR2 These are the subband frequency domain (FD) coefficients of TRP1 and TRP2, respectively, and W f This is a common set of FD bases that apply to both TRPs.

[0104]

[0106] Referring to Figure 9, and continuing to refer to the previous figure for context, the UE precoder recommended component 142 includes decomposition component 142c. In some examples, decomposition component 142c is based on one or more SD bases and one or more FD bases, and is W in both the spatial domain (SD) and the frequency domain (FD). TRP The recommendation is selectively decomposed into SD coefficients and FD coefficients. Thus, the decomposition component 142c is W in both SD and FD based on one or more SD bases and one or more FD bases. TRP This may provide a means for selectively decomposing recommendations into SD coefficients and FD coefficients.

[0105]

[0107] Referring again to Figure 5, the UE transmits the spatial domain coefficients and frequency domain coefficients to the network - block 530. In the following example, UE450, W s and W f Since this is already known to base station 410, {W 1,TPR1 ,W 1,TPR2 ,W t,TPR1 ,W t,TPR2 The value} is transmitted to the base station 410 as representing the vector of equation (5). The base station can then reconstruct the recommended vector of equation (5).

[0106]

[0108] Referring to Figure 9, and continuing to refer to the previous figure for context, the UE precoder recommended component 142 includes the transmit component 142d. In some examples, the transmit component 142d transmits spatial domain coefficients and frequency domain coefficients to the network. Thus, the transmit component 142d may provide a means for transmitting spatial domain coefficients and frequency domain coefficients to the network.

[0107]

[0109] In some examples, instead of decomposing UE450 as described in the following examples, UE450 decomposes W in SD based on a common SD basis matrix across TRP, as in equation (7). TRP Joint decomposition is performed across recommendations, and each W in FD is determined based on the channel-specific FD basis matrix. TRP The recommendations can be broken down into individual components.

[0108]

number

[0109]

[0110] In formula (7), W s This is a common set of SD bases that apply to both TRPs, and W 1,TPR1 and W 1,TPR2 These are the broadband SD coefficients of TRP1 and TRP2, respectively, and W t,TPR1 and W t,TPR2 These are the subband frequency domain (FD) coefficients of TRP1 and TRP2, respectively, and W f,TPR1 and W f,TPR2 These are separate FD bases for TRP1 and TRP2, respectively.

[0110]

[0111] In some examples, instead of decomposing as described above, the UE450 decomposes each W in the SD on the channel-specific SD basis matrix as shown in equation (8). TRP The recommendations are individually decomposed, and based on a common FD basis matrix across TRPs, W in FD TRP The joint can be disassembled as recommended.

[0111]

number

[0112]

[0112] In formula (8), W s,TPR1 and W s,TPR2 These are the SD bases of TRP1 and TRP2, respectively, and W 1,TPR1 and W 1,TPR2 These are the broadband SD coefficients of TRP1 and TRP2, respectively, and W t,TPR1 and W t,TPR2 These are the subband frequency domain (FD) coefficients of TRP1 and TRP2, respectively, and W f This is a common set of FD bases that apply to both TRPs.

[0113]

[0113] In some cases, instead of the UE450 decomposing as described above, the UE450 decomposes each W in the SD on the channel-specific SD basis matrix as shown in equation (9). TRP The recommendations are individually decomposed, and each W in FD is based on the channel-specific FD basis matrix. TRP The recommendations can be broken down into individual components.

[0114]

number

[0115]

[0114] In formula (9), W s,TPR1 and W s,TPR2 These are the SD bases of TRP1 and TRP2, respectively, and W 1,TPR1 and W 1,TPR2 These are the broadband SD coefficients of TRP1 and TRP2, respectively, and W t,TPR1 and W t,TPR2 These are the subband frequency domain (FD) coefficients of TRP1 and TRP2, respectively. f,TPR1 and W f,TPR2 These are separate FD bases for TRP1 and TRP2, respectively.

[0116]

[0115] In other examples, H TRP From complete W TRP Rather than determining a recommendation and then decomposing it, the UE, for each channel, i) the corresponding H TRP ii) Based on both one or more SD bases and one or more FD bases known to the UE and network, a precoder (W) for each such channel. TRP As a recommendation, the set of spatial domain (SD) coefficients and frequency domain (FD) coefficients can be determined directly.

[0117]

[0116] Referring to Figure 6, and continuing to refer to the previous figure for context, a method 600 for wireless communication is shown by example of the art disclosed herein. In such a method, blocks 510, 520, and 540 are performed as described above in relation to Figure 5. In such a method, the UE uses one of i), ii), iii), and iv) before selectively decomposing. TRP Block 610 receives instructions from the network to selectively decompose the recommendations. In a variation of the following example, UE450 receives instructions from base station 410 via RRC messages and, based on a common SD basis matrix across TRPs, decomposes the W in SD as shown in equation (6). TRP Joint decomposition across recommendations, and based on a common FD basis matrix across TRP, W in FD TRP Disassemble the joint as recommended.

[0118]

[0117] Referring to Figure 9, and continuing to refer to the previous figure for context, the UE precoder recommended component 142 includes the receiving component 142e. In some examples, the receiving component 142e is used with one of i), ii), iii), and iv) before selective decomposition. TRP The receiving component 142e receives instructions from the network to selectively decompose the recommendations. Therefore, before selectively decomposing, the receiving component 142e uses one of i), ii), iii), and iv) W TRP It may provide a means for receiving instructions from the network to selectively decompose recommendations.

[0119]

[0118] Referring again to Figure 6, the UE, in accordance with the received instruction, uses one or more SD basis and one or more FD basis to generate W in both the spatial domain (SD) and the frequency domain (FD). TRP Selectively decompose the recommendation into SD coefficients and FD coefficients - block 630. In the following example, UE450, according to the received instruction, calculates W in SD based on a common SD basis matrix across TRP, as shown in equation (6). TRPJoint decomposition across recommendations, and based on a common FD basis matrix across TRP, W in FD TRP Disassemble the joint as recommended.

[0120]

[0119] Referring to Figure 9, and continuing to refer to the previous figure for context, the UE precoder recommended component 142 includes the decomposition component 142c. In some examples, the decomposition component 142c, according to the received instruction, is based on one or more SD bases and one or more FD bases, in both the spatial domain (SD) and the frequency domain (FD) W TRP The recommendation is selectively decomposed into SD coefficients and FD coefficients. Thus, the decomposition component 142c is determined according to the received instruction, based on one or more SD bases and one or more FD bases, W in both SD and FD. TRP This may provide a means for selectively decomposing recommendations into SD coefficients and FD coefficients.

[0121]

[0120] Referring to Figure 7, and continuing to refer to the previous figure for context, a method 700 for wireless communication is shown by example of the art disclosed herein. In such a method, blocks 510, 520, and 540 are performed as described above in relation to Figure 5. In such a method 700, the UE selects a method for decomposition. Similar to block 530, the UE selectively decomposes the WTRP in both the spatial domain (SD) and the frequency domain (FD) into SD coefficients and FD coefficients based on one or more SD basis and FD basis under UE selection - block 730. The UE selects each W in SD on the channel-specific SD basis TRP The process begins with the individual decomposition of the TRPs - block 732. The UE then determines whether the CSI ports for each TRP are set to the same CSI-RS resource - block 734. If the UE determines that the CSI ports for each TRP are set to the same CSI-RS resource, the UE determines the W in the FD based on a common FD basis across the TRPs. TRPThe joint decomposition is performed across block 736. Combined with block 732, block 736 is executed according to equation (8). If the UE determines that the CSI ports for each TRP are not configured to the same CSI-RS resource, the UE determines each W in the FD based on the channel-specific FD basis. TRP The individual decomposition is performed on block 738. Combined with block 732, block 738 is executed according to equation (9).

[0122]

[0121] Referring to Figure 8, and continuing to refer to the previous figure for context, a method 800 for wireless communication is shown by example of the technology disclosed herein. In such a method, blocks 510, 520, 530, and 540 are performed as described above in relation to Figure 5. In such a method 800, the UE uses one or more SD bases and one or more FD bases to make a W in both SD and FD. TRP Report to the network the UE's ability to selectively decompose recommendations into SD and FD coefficients - Block 850.

[0123]

[0122] Referring to Figure 9, and continuing to refer to the previous figure for context, the UE precoder recommended component 142 includes the reporting component 142f. In some examples, the reporting component 142f is based on one or more SD bases and one or more FD bases, with W in both SD and FD. TRP The UE's ability to selectively decompose the recommendation into SD coefficients and FD coefficients is reported to the network. Thus, the reporting component 142f reports W in both SD and FD based on one or more SD bases and one or more FD bases. TRP This could provide a means to report to the network the UE's ability to selectively decompose recommendations into SD coefficients and FD coefficients.

[0124]

[0123] Referring to Figure 10, and continuing to refer to the previous figure for context, a method 1000 for wireless communication from the perspective of a base station / network is shown by example of the technology disclosed herein. In such a method 1000, each of a plurality of user equipment (UEs) receives transmissions from a plurality of transmit / receive points (TRPs) of the network. In such a method, the base station / network uses a precoder (W) based on one or more SD bases and one or more FD bases known to both the UE and the network. TRP )Receive the spatial domain (SD) and frequency domain (FD) coefficients describing the recommended decomposed set from such UE - block 1010. TRP The recommendation is to use the corresponding channel characteristics H measured in the UE. TRP It is based on a set of. For example, a precoder (W) is based on one or more SD bases and one or more FD bases known to both the UE and the network. TRP The spatial domain (SD) and frequency domain (FD) coefficients describing the recommended decomposed sets were determined according to one of the methods described in relation to Figures 5 to 8.

[0125]

[0124] Referring to Figure 12, and continuing to refer to the previous figure for context, another representation of a base station 410 (e.g., base station 102) for wireless communications is shown by example of the technology disclosed herein. As described above in relation to Figure 4, base station 410 includes a base station precoder component 144, a controller / processor 475, and memory 476. The base station precoder component 144 includes a receiving component 144a. In some examples, the receiving component 144a is a precoder (W) based on one or more SD bases and one or more FD bases known to both the UE and the network. TRP ) receives spatial domain (SD) coefficients and frequency domain (FD) coefficients from such UE that describe a recommended decomposed set. Thus, the receiving component 144a receives a precoder (W) based on one or more SD basis and one or more FD basis known to both the UE and the network. TRPThis may provide a means for receiving spatial domain (SD) and frequency domain (FD) coefficients describing a recommended decomposed set from such a UE.

[0126]

[0125] Referring again to Figure 10, the network / base station determines a precoder for each such UE based on the received SD coefficient, the received FD coefficient, and a known basis - block 1020. Referring to Figure 12, the base station precoder component 144 includes a determination component 144b. In some examples, the determination component 144b determines a precoder for each such UE based on the received SD coefficient, the received FD coefficient, and a known basis. Thus, the determination component 144b may provide a means for determining a precoder for each such UE based on the received SD coefficient, the received FD coefficient, and a known basis.

[0127]

[0126] The base station / network then precodes one or more communications from the network to each such UE using the corresponding determined precoder - block 1030. Referring to Figure 12, the base station precoder component 144 includes a precoding component 144c. In some examples, the precoding component 144c precodes one or more communications from the network to each such UE using the corresponding determined precoder. Thus, the precoding component 144c may provide means for precoding one or more communications from the network to each such UE using the corresponding determined precoder.

[0128]

[0127] Referring to Figure 11, and continuing to refer to the previous figure for context, a method 1100 for wireless communication is shown by example of the technology disclosed herein. In such a method, blocks 1020 and 1030 are performed as described above in relation to Figure 10. In such a method 1100, the network / base station uses one or more SD bases and one or more FD bases known to both the network and one or more such UEs, and has W in both SD and FD. TRP The recommendation is to send to one or more such UEs a UE-specific setting for selectively decomposing the SD coefficients and FD coefficients by the UE - block 1105. Referring to Figure 12, the base station precoder component 144 includes the transmit component 144d. In some examples, the transmit component 144d transmits the W in both SD and FD based on one or more SD basis and one or more FD basis known to both the network and one or more such UEs. TRP The recommendation is sent to one or more such UEs a UE-specific setting for selectively decomposing the UE into SD coefficients and FD coefficients. Thus, the transmitting component 144d sends W in both SD and FD based on one or more SD basis and one or more FD basis known to both the network and one or more such UEs. TRP The system may provide means for sending UE-specific settings to one or more such UEs for selectively decomposing the recommendations into SD coefficients and FD coefficients.

[0129]

[0128] The following examples are illustrative and their embodiments may be combined with other embodiments or teachings described herein without limitation. The technology disclosed herein includes methods, apparatus and computer-readable media including instructions for wireless communication. Embodiments of the technology disclosed herein provide methods, non-temporary computer-readable media and apparatus for reporting a recommended precoder matrix to a network / base station and for configuring a UE for such reporting. Each of the following examples may be embodied in a non-temporary computer-readable medium storing processor-executable code, which, when read and executed by at least one processor of a user device (UE) of the network, causes the UE / network / base station to perform the method of each example (as appropriate). Each of the following examples may be embodied as means for performing the function of each example, and such means disclosed herein include, but are not limited to, those described in relation to Figures 4, 9 and 12.

[0130]

[0129] Such techniques are used, for example, when a UE receives transmissions from multiple transmit / receive points (TRPs) in a network.

[0131]

[0130] In Example 1, the UE determines the channel characteristics (H) for each such channel between the TRP and the UE. TRP The set of ) is determined. Then the UE determines the corresponding H TRP Based on this, a precoder (W) for each such channel. TRP ) Determine the recommended set. The UE determines the W in both the spatial domain (SD) and the frequency domain (FD) based on one or more SD basis and one or more FD basis. TRP The recommendation is selectively decomposed into SD coefficients and FD coefficients. The UE then transmits the spatial domain coefficients and frequency domain coefficients to the network / base station.

[0132]

[0131] Example 2 includes Example 1 and can be selectively decomposed i) based on a common SD basis matrix across TRP, W in SD TRPJoint decomposition across recommendations, and based on a common FD basis matrix across TRP, W in FD TRP ii) Joint decomposition across recommendations, and based on a common SD basis matrix across TRP, W in SD TRP Joint decomposition is performed across recommendations, and each W in FD is determined based on the channel-specific FD basis matrix. TRP iii) Decompose the recommendations individually, each W in the SD on the channel-specific SD basis matrix TRP The recommendations are individually decomposed, and based on a common FD basis matrix across TRPs, W in FD TRP Recommended joint decomposition across the recommendations, and iv) each W in the SD on the channel-specific SD basis matrix. TRP The recommendations are individually decomposed, and each W in FD is determined based on the channel-specific FD basis matrix. TRP This includes one of the following: breaking down recommendations into their individual components.

[0133]

[0132] Example 3 includes one or more of Examples 1-2, and UE uses one of i), ii), iii), and iv) before selectively decomposing W TRP Instructions for selectively decomposing recommendations are received from the network / base station. In such examples, selective decomposition includes selectively decomposing according to the received instructions. Example 4 includes one or more of Examples 1-3. In Example 4, the instructions are received by the UE via a Radio Resource Control (RRC) message from the network / base station to the UE.

[0134]

[0133] Example 5 includes one or more of Examples 1-4. In Example 5, the decomposition is selected by the UE. In some such examples, the UE decomposes each W in the SD on a channel-specific SD basis. TRPThe UE chooses to decompose the recommendations individually. The UE determines whether the Channel State Information (CSI) port for each TRP is set to the same CSI Reference Signal (CSI-RS) resource. If the UE determines that the CSI port for each TRP is set to the same CSI-RS resource, it uses a common FD basis across the TRPs to determine the W in the FD. TRP If you choose to perform joint decomposition across recommendations and determine that the CSI ports for each TRP are not configured to the same CSI-RS resource, then, based on the channel-specific FD basis, each W in the FD will be... TRP Choose to break down the recommendations into individual components.

[0135]

[0134] Example 6 includes one or more of Examples 1 to 5. In Example 6, the UE is based on one or more SD bases and one or more FD bases, with W in both SD and FD. TRP The UE's ability to selectively decompose recommendations into SD and FD coefficients is reported to the network / base station.

[0136]

[0135] From the perspective of a network / base station, computer-readable media including methods, apparatus, and instructions for wireless communication are included in the technology disclosed herein. In Example 8, the network / base station is based on one or more SD bases and one or more FD bases known to both the UE and the network, W TRP The SD and FD coefficients, describing the recommended decomposed sets, are received from each of the multiple UEs that receive transmissions from multiple TRPs in the network. TRP The recommendation is to use channel characteristics H measured in the UE. TRPThis is based on a corresponding set of . The network determines a precoder for each such UE based on the received SD coefficients, received FD coefficients, and known basis. The network / base station then precodes one or more communications from the network / base station to each such UE using the corresponding determined precoder. Example 8 includes Example 7. In Example 8, the network / base station determines a precoder for both SD and FD based on one or more SD basis and one or more FD basis known to both the network / base station and one or more such UEs. TRP The recommendation is to send to one or more UE-specific settings for the UE to selectively decompose the UE into SD and FD factors. In such an example, the network / base station receives the subsequent SD and FD factors based on the transmitted UE-specific settings. Example 9 includes one or more of Examples 7-8. In Example 9, transmitting includes transmitting in an RRC message.

[0137]

[0136] In Example 10, a UE receiving transmissions from multiple transmit / receive points (TRPs) in a network determines a set of channel characteristics (HTRPs) for each such TRP and channel between the UE. For each such channel, the UE determines a set of spatial domain (SD) and frequency domain (FD) coefficients as a set of precoder (WTRP) recommendations for each such channel, based on both i) the corresponding HTRP and ii) one or more SD basis and one or more FD basis known to the UE and the network.

[0138]

[0137] The foregoing description is provided to enable those skilled in the art to practice the various embodiments described herein. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments. Thus, the claims are not intended to be limited to the embodiments shown herein, but should be given the widest possible scope that is not inconsistent with the language of the claims, and singular references to elements shall mean "one or more" and not "unique" unless otherwise specified. The word "exemplary" is used herein to mean "serving as an example, case, or illustration." None of the embodiments described herein as "exemplary" should necessarily be construed as being preferable or advantageous to any other embodiment. Unless otherwise specified, the term "several" refers to one or more. Combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" include any combination of A, B, and / or C, and may include multiple A's, multiple B's, or multiple C's. Specifically, combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" can be A only, B only, C only, A and B, A and C, B and C, or A and B and C, and any such combination may include one or more elements of A, B, or C. All structural and functional equivalents of elements of various aspects described throughout this disclosure, whether known to those skilled in the art or to become known thereafter, are expressly incorporated herein by reference and intended to be encompassed by the claims. Furthermore, nothing disclosed herein is intended to be made public, whether such disclosure is expressly stated in the claims or not.The terms "module," "mechanism," "element," and "device" are not always substitutes for the term "means." Therefore, no element of a patent claim should be interpreted as means plus function unless that element is explicitly enumerated using the phrase "~means." The invention described in the original claims of this application is listed below. [C1] A method of wireless communication, A user equipment (UE) of a network that receives transmissions from multiple transmit / receive points (TRPs) of the network, and the UE controls the channel characteristics (H) for each such TRP and the UE. TRP ) determining the set, Corresponding H TRP Based on this, a precoder (W) for each such channel. TRP ) The recommended set is determined by the aforementioned UE, Based on one or more SD basis sets and one or more FD basis sets, the W in both the spatial domain (SD) and the frequency domain (FD) TRP The recommendation is to selectively decompose the SD coefficient and FD coefficient using the aforementioned UE, The spatial domain coefficient and the frequency domain coefficient are transmitted to the network by the UE, Methods that include... [C2] Selective decomposition is i) Based on a common SD basis matrix across the TRP, the W in the SD TRP Joint decomposition is performed across the recommendations, and based on a common FD basis matrix across the TRP, the W in the FD TRP Disassemble the joint as recommended. ii) Based on a common SD basis matrix across the TRP, the W in the SD TRP Joint decomposition is performed across the recommendations, and based on the channel-specific FD basis matrix, each W in the FD is determined. TRP Breaking down recommendations into individual components, iii) Each W in the SD on the channel-specific SD basis matrix TRP The recommendations are individually decomposed, and based on a common FD basis matrix across the TRPs, the W in the FD is determined. TRP Disassemble the joint as recommended, and iv) Each W in the SD on the channel-specific SD basis matrix TRP The recommendations are individually decomposed, and based on the channel-specific FD basis matrix, each W in the FD is determined. TRP Breaking down recommendations into individual components, Including one of the following, The method described in C1. [C3] Before selectively decomposing, use one of i), ii), iii), and iv) to W TRP The system further includes receiving instructions from the network for selectively decomposing recommendations. The selective decomposition includes selective decomposition in accordance with the received command. The method described in C1. [C4] The method of C3, wherein the instruction is received by the UE via a radio resource control (RRC) message from the network to the UE. [C5] The method of C1, wherein the decomposition is selected by the UE. [C6] The aforementioned UE is Each W in the SD on the channel-specific SD basis TRP We chose to break down the recommendations individually. Determine whether the Channel State Information (CSI) port for each TRP is set to the same CSI Reference Signal (CSI-RS) resource. If it is determined that the CSI ports for each TRP are set to the same CSI-RS resource, then, based on a common FD basis across the TRPs, the W in the FD TRP Choosing to disassemble the joint over the recommended period, If it is determined that the CSI ports for each TRP are not configured to the same CSI-RS resource, then, based on the channel-specific FD basis, each W in the FD TRP Choose to break down the recommendations individually. Methods for C5. [C7] Based on one or more SD bases and one or more FD bases, the W in both the SD and the FD TRP The UE further includes reporting to the network its ability to selectively decompose the recommendation into SD coefficients and FD coefficients. The method described in C1. [C8] User equipment (UE) of a wireless communication network, Memory and The system comprises at least one processor coupled to the memory, The memory contains instructions that can be executed by the at least one processor, and the UE, The UE, which receives transmissions from multiple transmit / receive points (TRPs) of the network, determines the channel characteristics (H) for each such TRP and the UE. TRP ) Determine the set, Corresponding H TRP Based on this, a precoder (W) for each such channel. TRP ) Determine the recommended set, Based on one or more SD basis sets and one or more FD basis sets, the W in both the spatial domain (SD) and the frequency domain (FD) TRP The recommendation is selectively decomposed into SD coefficient and FD coefficient. A command to transmit the spatial domain coefficient and the frequency domain coefficient to the network, UE. [C9] Selective decomposition is i) Based on a common SD basis matrix across the TRP, the W in the SD TRP Joint decomposition is performed across the recommendations, and based on a common FD basis matrix across the TRP, the W in the FD TRP Disassemble the joint as recommended. ii) Based on a common SD basis matrix across the TRP, the W in the SD TRP Joint decomposition is performed across the recommendations, and based on the channel-specific FD basis matrix, each W in the FD is determined. TRP Breaking down recommendations into individual components, iii) Each W in the SD on the channel-specific SD basis matrix TRP The recommendations are individually decomposed, and based on a common FD basis matrix across the TRPs, the W in the FD is determined. TRP Disassemble the joint as recommended, and iv) Each W in the SD on the channel-specific SD basis matrix TRP The recommendations are individually decomposed, and based on the channel-specific FD basis matrix, each W in the FD is determined. TRP Breaking down recommendations into individual components, Including one of the following, UE as described in C8. [C10] The memory is an instruction that can be executed by the at least one processor, and before selectively decomposing it into the UE, it uses one of i), ii), iii), and iv) W TRP The instruction further includes an instruction to receive instructions from the network for selectively decomposing recommendations, The selective decomposition mentioned above is W TRP This includes selectively decomposing a recommendation in accordance with the received instruction for selectively decomposing a recommendation. UE as described in C8. [C11] W TRP The UE according to C10, wherein the instruction for selectively decomposing recommendations is received by the UE via a radio resource control (RRC) message from the network to the UE. [C12] The UE described in C8, which is selected by the UE to be disassembled. [C13] The memory contains instructions that can be executed by the at least one processor, and the UE, Each W in the SD on the channel-specific SD basis TRP Choosing to break down recommendations into individual components, Determine whether the Channel Status Information (CSI) port for each TRP is set to the same CSI Reference Signal (CSI-RS) resource. If it is determined that the CSI ports for each TRP are set to the same CSI-RS resource, then, based on a common FD basis across the TRPs, the W in the FD TRP Select the recommended joint disassembly, and If it is determined that the CSI ports for each TRP are not configured to the same CSI-RS resource, then, based on the channel-specific FD basis, each W in the FD TRP Select a separate decomposition for the recommendation. W TRP Further instructions to selectively break down recommendations, UE as described in C12. [C14] The memory contains instructions that can be executed by the at least one processor, and the UE Based on one or more SD bases and one or more FD bases, the W in both the SD and the FD TRP The UE's ability to selectively decompose the recommendation into SD coefficients and FD coefficients is reported to the network by the UE. Further instructions UE as described in C8. [C15] A method of wireless communication, A precoder (W) based on one or more SD bases and one or more FD bases known to both the user equipment (UE) and the wireless communication network. TRP ) Recommended disassembled set, the W TRP The recommendation is the corresponding channel characteristic H measured in the aforementioned UE. TRP It is based on the set, W TRP The spatial domain (SD) coefficients and frequency domain (FD) coefficients describing the recommended decomposed set are received by the network from each of the multiple UEs that receive transmissions from multiple TRPs of the network, A method comprising: determining a precoder for each such UE by the network based on the received SD coefficient, the received FD coefficient, and the known basis; and precoding one or more communications from the network to each such UE by the network using the corresponding determined precoder. [C16] Based on the network and one or more SD bases and one or more FD bases known to both the SD and the FD, W TRP The recommendation is to transmit, via the network, UE-specific settings for the UE to selectively decompose into SD coefficients and FD coefficients, to one or more such UEs. The subsequent SD coefficient and FD coefficient based on the transmitted UE-specific settings are received by the network. This also includes, Methods described in C15. [C17] The method of C16, wherein the transmission includes transmitting in a Radio Resource Configuration (RRC) message. [C18] Memory and, The system comprises at least one processor coupled to the memory, The memory contains instructions that can be executed by the at least one processor, and the device contains, A precoder (W) based on one or more SD bases and one or more FD bases known to both the user equipment (UE) and the wireless communication network. TRP ) Recommended disassembled set, the W TRP The recommendation is the corresponding channel characteristic H measured in the aforementioned UE. TRP It is based on the set, W TRP The spatial domain (SD) coefficients and frequency domain (FD) coefficients describing the recommended decomposed set are received by the network from each of the multiple UEs that receive transmissions from multiple TRPs of the network. Based on the received SD coefficient, the received FD coefficient, and the known basis, the network causes a precoder to be determined for each such UE. The network precodes one or more communications from the network to each such UE using the corresponding determined precoder. Including orders, device. [C19] The memory contains instructions that can be executed by the at least one processor, and the device contains Based on the network and one or more SD bases and one or more FD bases known to both the SD and the FD, W in both the SD and the FD TRP The network causes one or more such UEs to send recommendations, UE-specific settings for selectively decomposing the UE into SD coefficients and FD coefficients, The subsequent SD coefficient and FD coefficient based on the transmitted UE-specific settings are to be received by the network. A device as described in C18, including further instructions. [C20] The device according to C19, wherein the transmission includes transmitting in a Radio Resource Configuration (RRC) message.

Claims

1. A method of wireless communication, A network user device (UE) that receives transmissions from multiple transmission / reception points (TRPs) of the network, and the UE controls the channel characteristics (H) for each TRP and the UE. ＴＲＰ ) determining the set, Corresponding H ＴＲＰ Based on this, a precoder (W) for each channel. ＴＲＰ ) The recommended set is determined by the aforementioned UE, Based on one or more SD basis sets and one or more FD basis sets, the W in both the spatial domain (SD) and the frequency domain (FD) ＴＲＰ The recommendation is to selectively decompose the SD coefficient and FD coefficient using the aforementioned UE, The spatial domain coefficient and the frequency domain coefficient are transmitted to the network by the UE, Methods that include...

2. Selective decomposition is i) Based on a common SD basis matrix across the TRP, the W in the SD ＴＲＰ Joint decomposition is performed over the recommendations, and based on a common FD basis matrix over the TRP, the W in the FD ＴＲＰ Disassemble the joint as recommended. ii) Based on a common SD basis matrix across the TRP, the W in the SD ＴＲＰ Joint decomposition is performed across the recommendations, and based on the channel-specific FD basis matrix, each W in the FD is determined. ＴＲＰ Breaking down recommendations into individual components, iii) Each W in the SD is individually decomposed on the channel-specific SD basis matrix, and the W in the FD is jointly decomposed over the TRP based on a common FD basis matrix ＴＲＰ and the W in the FD is jointly decomposed over the TRP based on a common FD basis matrix ＴＲＰ and jointly decomposed over the recommendation, and iv) Each W in the SD on the channel-specific SD basis matrix ＴＲＰ The recommendations are individually decomposed, and based on the channel-specific FD basis matrix, each W in the FD is determined. ＴＲＰ Breaking down recommendations into individual components, Including one of the following, The method according to claim 1.

3. Before selective decomposition, use one of i), ii), iii), and iv) to W ＴＲＰ The system further includes receiving instructions from the network for selectively decomposing recommendations. The selective decomposition includes selective decomposition in accordance with the received command. The method according to claim 2.

4. The method according to claim 3, wherein the instruction is received by the UE via a radio resource control (RRC) message from the network to the UE.

5. The method according to claim 1, wherein the disassembly is selected by the UE.

6. The aforementioned UE, Each W in the SD on the channel-specific SD basis ＴＲＰ We chose to break down the recommendations individually. Determine whether the Channel State Information (CSI) port for each TRP is set to the same CSI Reference Signal (CSI-RS) resource. If it is determined that the CSI ports for each TRP are set to the same CSI-RS resource, then the W in the FD is determined based on a common FD basis across the TRPs. ＴＲＰ Choosing to disassemble the joint over the recommended period, If it is determined that the CSI ports for each TRP are not configured to the same CSI-RS resource, then, based on the channel-specific FD basis, each W in the FD ＴＲＰ Choose to break down the recommendations individually. The method according to claim 5.

7. Based on one or more SD bases and one or more FD bases, the W in both the SD and the FD ＴＲＰ The UE further includes reporting to the network its ability to selectively decompose the recommendation into SD coefficients and FD coefficients. The method according to claim 1.

8. User equipment (UE) of a wireless communication network, Memory and The system comprises at least one processor coupled to the memory, The memory contains instructions that can be executed by the at least one processor, and the UE contains, The UE, which receives transmissions from multiple transmission / reception points (TRPs) of the network, determines the channel characteristics (H) for each channel between each TRP and the UE. ＴＲＰ ) Determine the set, Corresponding H ＴＲＰ Based on this, a precoder (W) for each channel. ＴＲＰ ) Determine the recommended set, Based on one or more SD basis sets and one or more FD basis sets, the W in both the spatial domain (SD) and the frequency domain (FD) ＴＲＰ The recommendation is selectively decomposed into SD coefficient and FD coefficient. A command to transmit the spatial domain coefficient and the frequency domain coefficient to the network, UE.

9. Selective decomposition is i) Based on a common SD basis matrix across the TRP, the W in the SD ＴＲＰ Joint decomposition is performed over the recommendations, and based on a common FD basis matrix over the TRP, the W in the FD ＴＲＰ Disassemble the joint as recommended. ii) Based on a common SD basis matrix across the TRP, the W in the SD ＴＲＰ Joint decomposition is performed across the recommendations, and based on the channel-specific FD basis matrix, each W in the FD is determined. ＴＲＰ Breaking down recommendations into individual components, iii) Each W in the SD on the channel-specific SD basis matrix ＴＲＰ The recommendations are individually decomposed, and based on the common FD basis matrix across the TRP, W in the FD ＴＲＰ Disassemble the joint as recommended, and iv) Each W in the SD on the channel-specific SD basis matrix ＴＲＰ The recommendations are individually decomposed, and based on the channel-specific FD basis matrix, each W in the FD is determined. ＴＲＰ Breaking down recommendations into individual components, Including one of the following, The UE according to claim 8.

10. The memory contains instructions that can be executed by the at least one processor, which, before being selectively decomposed into the UE, use one of i), ii), iii), and iv) W ＴＲＰ The instruction further includes an instruction to receive instructions from the network for selectively decomposing recommendations, The selective decomposition described above is W ＴＲＰ This includes selectively decomposing a recommendation in accordance with the received instruction for selectively decomposing a recommendation. The UE as described in claim 9.

11. W ＴＲＰ The UE according to claim 10, wherein the instruction for selectively decomposing recommendations is received by the UE via a radio resource control (RRC) message from the network to the UE.

12. The UE according to claim 8, wherein the disassembly is selected by the UE.

13. The memory contains instructions that can be executed by the at least one processor, and the UE contains, Each W in the SD on the channel-specific SD basis ＴＲＰ Choosing to break down recommendations into individual components, Determine whether the channel status information (CSI) port for each TRP is set to the same CSI reference signal (CSI-RS) resource. If it is determined that the CSI ports for each TRP are set to the same CSI-RS resource, then the W in the FD is determined based on a common FD basis across the TRPs. ＴＲＰ Select the recommended joint disassembly, and If it is determined that the CSI ports for each TRP are not configured to the same CSI-RS resource, then, based on the channel-specific FD basis, each W in the FD ＴＲＰ Select a separate decomposition for the recommendation. W ＴＲＰ Further instructions to selectively break down recommendations, The UE according to claim 12.

14. The memory contains instructions that can be executed by the at least one processor, and the UE contains, Based on one or more SD bases and one or more FD bases, the W in both the SD and the FD ＴＲＰ The UE's ability to selectively decompose the recommendation into SD coefficients and FD coefficients is reported to the network by the UE. Further instructions The UE according to claim 8.

15. A method of wireless communication, A precoder (W) based on one or more known SD bases and one or more FD bases for both the user equipment (UE) and the wireless communication network. ＴＲＰ ) Recommended disassembled set, the W ＴＲＰ The recommendation is the corresponding channel characteristic H measured in the UE. ＴＲＰ It is based on the set, W ＴＲＰ The spatial domain (SD) coefficients and frequency domain (FD) coefficients describing the recommended decomposed set are received by the network from each of the multiple UEs that receive transmissions from multiple transmit / receive points (TRPs) of the network, Based on the received SD coefficient, the received FD coefficient, and the known basis, the network determines a precoder for each UE. The network precodes one or more communications from the network to each UE using the corresponding determined precoder. Methods that include...

16. Based on the network and one or more SD bases and one or more FD bases known to both the SD and the FD, W in both the SD and the FD ＴＲＰ The recommendation is to transmit to one or more UEs via the network UE-specific settings for selectively decomposing the UE into SD coefficients and FD coefficients, The subsequent SD coefficient and FD coefficient based on the transmitted UE-specific settings are received by the network. This also includes, The method according to claim 15.

17. The method according to claim 16, wherein the transmission includes transmitting in a radio resource configuration (RRC) message.

18. Memory and The system comprises at least one processor coupled to the memory, The memory contains instructions that can be executed by the at least one processor, and the device contains, A precoder (W) based on one or more known SD bases and one or more FD bases for both the user equipment (UE) and the wireless communication network. ＴＲＰ ) Recommended disassembled set, the W ＴＲＰ The recommendation is the corresponding channel characteristic H measured in the UE. ＴＲＰ It is based on the set, W ＴＲＰ The spatial domain (SD) coefficients and frequency domain (FD) coefficients describing the recommended decomposed set are received by the network from each of the multiple UEs that receive transmissions from multiple transmit / receive points (TRPs) of the network. Based on the received SD coefficient, the received FD coefficient, and the known basis, the network causes a precoder to be determined for each UE. One or more communications from the network to each UE are precoded by the network using the corresponding determined precoder. Including orders, device.

19. The memory contains instructions that can be executed by the at least one processor, and the device contains, Based on the network and one or more SD bases and one or more FD bases known to both the SD and the FD, W in both the SD and the FD ＴＲＰ The recommendation is transmitted via the network to one or more UEs, which have UE-specific settings for selectively decomposing the UE into SD coefficients and FD coefficients. The subsequent SD coefficient and FD coefficient based on the transmitted UE-specific settings are to be received by the network. The device according to claim 18, further comprising instructions.

20. The device according to claim 19, wherein the transmission includes transmitting in a radio resource configuration (RRC) message.

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