Channel state information reporting method and apparatus for wireless communication

Abstract

Embodiments of the invention relate to methods and apparatus implemented in the form of a wireless device (700) and a network node (800). The method performed by the wireless device comprises receiving (401A), from the network node (800), a configuration or indication representing a number N1 of first dimensions or columns and a number N2 of second dimensions or rows of an antenna port layout at the network node; and receiving a configuration or indication representing M channel state information reference signal (CSI-RS) resources, wherein each CSI-RS resource comprises a plurality of antenna ports or CSI-RS ports, the antenna ports or CSI-RS ports of each CSI-RS resource being mapped to a subset or a proper subset of row indices and column indices of the antenna port layout. The method further comprises determining (402A), for each CSI-RS resource, a number of entries of a precoding vector associated with the subset or the proper subset of rows and columns of the antenna port layout; generating (403A) a CSI report or a CSI feedback report containing a precoding matrix indicator (PMI) indicating the precoding vector; and reporting (404A) the CSI report or the CSI feedback report to the network node (800).

Description

Technical Field

[0001] This disclosure relates to the field of wireless communication, and specifically to a method and apparatus for reporting channel state information (CSI) feedback in the uplink control channel (UCI) when performing codebook-based precoding in wireless communication networks (e.g., advanced 5G networks). Background Technology

[0002] Radio access technology (RAT) in fifth-generation (5G) mobile communication systems, also known as 5G new radio (NR), offers a higher level of performance and flexibility than previous generations of mobile communication systems. The driving force behind 5G mobile communication stems from the need for ubiquitous connectivity for various applications, such as automotive communication, remote control with feedback, video downloading, and data applications for Internet of Things (IoT) devices, machine-type communication (MTC) devices, etc. 5G wireless technology brings several key advantages, such as faster speeds, lower latency, and enhanced connectivity. The 3rd Generation Partnership Project (3GPP) provides a complete system specification for the 5G network architecture, which includes at least one radio access network (RAN), core transport networks (CN), and service capabilities.

[0003] Figure 1 A simplified schematic diagram of a wireless communication network 100 is shown, which includes a core network (CN) 110 and a radio access network (RAN) 120. The RAN 120 in the diagram includes multiple network nodes or radio base stations, referred to as gNBs in 5G. Three radio base stations are depicted here: gNB1, gNB2, and gNB3. Each gNB serves an area called a coverage area or cell. Figure 1Three cells 121, 122, and 123 are shown, each served by its respective gNB (gNB1, gNB2, and gNB3). It should be noted that the network 100 can include any number of cells and gNBs. Wireless base stations or network nodes provide services to users within the cell. In 4G or LTE, wireless base stations are called eNBs; in 3G or UMTS, they are called NodeBs; and in other radio access technologies, they are called BSs. User equipment (UE) can be wireless or mobile terminal equipment or static communication equipment. Wireless equipment can be mobile terminal equipment, UEs, Internet of Things (IoT) devices, MTC devices, etc. IoT devices can include wireless sensors, software, actuators, and computer equipment. IoT devices can be embedded in mobile devices, motor vehicles, industrial equipment, environmental sensors, medical devices, aircraft, and many more, providing network connectivity that enables these devices to collect and exchange data across existing network infrastructure.

[0004] Back Figure 1 Each cell shown includes UEs and IoT devices. gNB1 in cell 121 serves UE1 121A, UE2 121B, and IoT device 121C. Similarly, gNB2 in cell 122 serves UE3 122A, UE4 122B, and IoT device 122C, and gNB3 in cell 123 serves UE5 123A, UE6 123B, and IoT device 123C. The wireless communication network 100 may include any number of UEs and IoT devices or any other type of device. These devices communicate with the serving gNB in ​​the uplink, while the gNB communicates with these devices in the downlink. The corresponding base stations gNB1 to gNB3 can be connected to CN 110, for example, via the S1 interface, through corresponding backhaul links 111, 121D, 122D, and 123D. Figure 1 The diagram is schematically depicted by arrows pointing to the "core". The core network 110 can connect to one or more external networks, such as the Internet. gNBs can connect to each other via the S1 interface, or the X2 interface, or the XN interface in 5G, through the corresponding interface links 121E, 122E and 123E (depicted by arrows pointing to gNBs in the diagram).

[0005] For data transmission, a physical resource grid can be used. A physical resource grid can include a set of resource elements (REs) to which various physical channels and physical signals are mapped. For example, physical channels can include physical downlink, uplink, and / or sidelink shared channels (PDSCH, PUSCH, PSSCH) carrying user-specific data (also known as downlink, uplink, or sidelink payload data); physical broadcast channels (PBCH) carrying, for example, master information blocks (MIBs) and system information blocks (SIBs); and physical downlink, uplink, and / or sidelink control channels (PDCCH, PUCCH, PSCCCH) carrying, for example, downlink control information (DCI), uplink control information (UCI), or sidelink control information (SCI). For uplink, physical channels can also include physical random access channels (PRACH or RACH), which the UE uses to access the network after synchronizing and obtaining the MIB and SIB. Physical signals can include reference signals (RS), synchronization signals (SS), etc. Resource grids can include frames or radio frames with a specific duration (e.g., 10 milliseconds) in the time domain and a given bandwidth in the frequency domain. Radio frames can have multiple subframes of predefined length, such as two subframes of 1 millisecond length. Each subframe can include two slots containing multiple OFDM symbols, depending on the cyclic prefix (CP) length. In 5G, each slot consists of 14 or 12 OFDM symbols based on the normal CP and extended CP, respectively. Frames can also consist of fewer OFDM symbols, for example, when utilizing shortened transmission time intervals (TTI) or micro-slot / non-slotted frame structures containing only a few OFDM symbols. 5G NR supports slot aggregation, so data transmission can be scheduled to span one or more slots. The slot format indicator tells the UE whether an OFDM symbol is downlink, uplink, or flexible.

[0006] Wireless communication networks can be any single-carrier or multi-carrier system using frequency division multiplexing, such as orthogonal frequency-division multiplexing (OFDM) systems, orthogonal frequency-division multiple access (OFDMA) systems, or any other signal based on Discrete Fourier Transform (DFT) with or without CP, such as DFT spread-spectrum OFDM (DFT-s-OFDM). Other waveforms can also be used, such as non-orthogonal waveforms for multiple access, such as filter-bank multicarrier (FBMC), generalized frequency division multiplexing (GFDM), or universal filtered multicarrier (UFMC). Wireless communication systems can operate, for example, according to LTE-Advanced Pro standards, 5G or NR (New Radio) standards, or any other standard using any of the aforementioned waveforms.

[0007] Figure 1 The wireless communication network system shown can be a heterogeneous network with two different coverage networks: a macrocell network consisting of macro cells, each macro cell including a macro base station (e.g., base stations gNB1 to gNB3), and a small cell base station network. Figure 1 (Not shown in the text), such as femtocells or picocells. In addition to the wireless networks described above, there are also non-terrestrial wireless communication networks, which include spaceborne transceivers (e.g., satellites) and / or airborne transceivers (e.g., unmanned aerial vehicle systems). Non-terrestrial wireless communication networks or systems can operate in a manner similar to those described in the references above. Figure 1 The described method of operation of the ground system, for example, according to the LTE-advanced pro standard or the 5G or NR standard.

[0008] In such Figure 1In the schematic depiction of the wireless communication network system, multi-antenna techniques, such as those used in LTE, NR, or any other communication system, can be employed to improve user data rates, link reliability, cell coverage, and network capacity. To support multi-stream or multi-layer transmission, linear precoding is used at the physical layer of the communication system. Linear precoding is performed by a precoder matrix that maps the data layer to antenna ports. Precoding can be viewed as a generalization of beamforming, a technique that spatially directs or focuses data transmission toward the intended receiver. The precoder matrix used at the gNB to map data to transmit antenna ports is determined using Channel State Information (CSI).

[0009] In wireless communication network systems as described above (such as LTE or New Radio (5G)), downlink signals transmit data signals, control signals containing downlink (DL) control information (DCI), and multiple reference signals or symbols (RS) for different purposes. The gNodeB (or gNB or base station) transmits data and downlink control information (DCI) via the so-called Physical Downlink Shared Channel (PDSCH) and Physical Downlink Control Channel (PDCCH) or enhanced PDCCH (ePDCCH), respectively. Furthermore, the downlink signals of the gNB may contain one or more types of reference signals (RS), including common RS (CRS), channel state information RS (CSI-RS), demodulation RS (DM-RS), and phase tracking RS (PT-RS) in LTE. CRS is transmitted over the DL system bandwidth portion and is used at the user equipment (UE) to obtain channel estimation for demodulating data or control information. Compared to CRS, CSI-RS is transmitted at a reduced density in both the time and frequency domains and is used at the UE for channel estimation or for Channel State Information (CSI) acquisition. DM-RS is transmitted only in the bandwidth portion of the corresponding PDSCH and is used by the UE for data demodulation. Several CSI-RS reporting mechanisms are used for signal precoding at the gNB, such as non-precoded CSI-RS and beamforming CSI-RS reporting. For non-precoded CSI-RS, a one-to-one mapping between CSI-RS ports and transceiver units (TXRUs) of the antenna array at the gNB is utilized. Therefore, non-precoded CSI-RS provides cell-wide coverage where different CSI-RS ports have the same beam direction and beamwidth. For UE-specific or non-UE-specific beamforming / precoded CSI-RS, beamforming operations are applied to a single antenna port or multiple antenna ports to have multiple high-gain narrow beams in different directions, thus not providing cell-wide coverage.

[0010] In wireless communication networks employing time division duplexing (TDD), channel identity estimation (CSI) is available at the base station (gNB) due to channel reciprocity. However, when frequency division duplexing (FDD) is used, due to the lack of channel reciprocity, the channel is estimated at the UE and the estimated value is fed back to the gNB. Figure 2 A block-based model for using codebook-based precoding Multiple Input Multiple Output (MIMO) DL transmission according to LTE Release 8 is shown. Figure 2 The diagram schematically illustrates a base station 200 (gNB), a user equipment (UE) 202, and a channel 204 (e.g., a radio channel) for wireless data communication between the base station 200 and the user equipment 202. The base station 200 includes an antenna array ANT having multiple antennas or antenna elements. T The precoder 206 receives data vector 208 and precoder matrix F from codebook 210. The term "precoder" refers to, but is not limited to, a precoding matrix or precoder matrix. Channel 204 can be described by channel tensor / matrix 212. User equipment 202 is connected via an antenna or antenna array ANT having multiple antennas or antenna elements. R Receive data vector 214. A feedback channel 216 is provided between user equipment 202 and base station 200 for transmitting feedback information. Previous versions of 3GPP (up to version 15) supported CSI estimation at the UE using multiple downlink reference symbols (e.g., CSI-RS).

[0011] In FDD systems (up to version 15), the estimated channel at the UE is implicitly reported to the gNB. The CSI report transmitted by the UE via the feedback channel includes a rank index (RI), a precoding matrix index (PMI), and a channel quality index (CQI) (and CRI from version 13 onwards), allowing the gNB to determine the precoding matrix and the modulation order and coding scheme (MCS) of the symbols to be transmitted. The PMI and RI are used to determine the precoding matrix from a predefined set of matrices Ω (also called a codebook). The codebook (e.g., according to LTE) can be a lookup table, where each entry has a matrix. The UE's PMI and RI determine which row and column of the table to retrieve the precoding matrix to use.

[0012] The precoder and codebook design up to version 15 is for gNBs equipped with either one-dimensional uniform linear arrays (ULAs) or two-dimensional uniform planar arrays (UPAs). The one-dimensional uniform linear arrays have... A total of dual-polarized antennas (total) (one antenna or antenna port); a two-dimensional uniform planar array in There are dual-polarized antennas at each location (total) (One antenna or antenna port). ULA only allows control of radio waves in the horizontal (azimuth) direction, enabling gNB to achieve azimuth-only beamforming; while UPA supports transmit beamforming in both the vertical (elevation) and horizontal (azimuth) directions, also known as full-dimension (FD) MIMO. The codebook, such as in the case of large-scale antenna arrays like FD-MIMO, can be a set of beamforming weights that use the array's array response vector to form spatially separated electromagnetic transmit / receive beams. The array's beamforming weights (also called array steering vectors) are amplitude gain and phase adjustments applied to the signal fed to the antenna (or received from the antenna) to radiate in a specific direction (or receive from a specific direction). The components of the precoder matrix are obtained from the codebook, and PMI and RI are used to read the codebook and obtain the precoder. When using ULA or UPA for signal transmission, the array steering vector can be described by the columns of a two-dimensional discrete Fourier transform (DFT) matrix.

[0013] The precoder matrix in the Type-I, Type-I multi-panel, and Type-II CSI reporting schemes used in the 3GPP NR standard consists of a two-level structure (i.e., two component codebooks). Definition. The first component, or so-called first-level pre-encoder or matrix. This is used to select multiple beam vectors from a matrix based on the Discrete Fourier Transform (DFT), also known as a spatial codebook. Additionally, the first-level pre-encoder... Corresponding to the broadband matrix, it contains multiple spatial beamforming vectors (so-called spatial beams) selected from the DFT-based codebook matrix for the two polarizations of the antenna array. A second component, or so-called second-level pre-encoder, is used to combine the selected beam vectors. This means the second-level pre-encoder, or matrix... Corresponding to the selection / combination / in-phase matrix, to select / combination / common phase The beam defined in [the standard]. For rank-R transmission, Include vectors, where Represents the transmission rank, where entries for each vector are selected to combine single or multiple beams within each polarization. Matrix and The selection of the matrix is ​​made by the UE based on a reference signal (e.g., CSI-RS) and an understanding of the channel conditions. The selected matrix is ​​indicated in the CSI report in the form of RI (RI represents the rank of the precoding matrix) and PMI, and is used by the gNB to update the multi-user precoder for the next transmission time interval.

[0014] In the following text, when used alone, the term "higher layer" refers to any communication layer above the physical layer in the protocol stack. When used in conjunction with a specific layer, the term refers to any communication above that layer in the protocol stack.

[0015] In this disclosure, the terms "serving cell" and "carrier component (CC)" are used interchangeably, both referring to the serving cell configured for the UE, which is typically an independent physical carrier centered at a specific carrier frequency. The cell size and beamforming reference signal may vary depending on the frequency of the component carrier / serving cell.

[0016] The terms "PDxCH" or "PDXCH" can indicate the Physical Downlink Shared Channel (PDSCH) or the Physical Downlink Control Channel (PDCCH), while "PUxCH" or "PUxCH" can indicate the Physical Uplink Shared Channel (PUSCH) or the Physical Uplink Control Channel (PUCCH). The terms "PxxCH" or "PXXCH" can represent PDSCH, PDCCH, PUSCH, PRACH, PBCH, PSSCH, or PSCH.

[0017] In the disclosure of this invention, the phrase “fixed / predefined / provided in the specification” may have the following meaning: one or more rules and / or methods and / or details regarding a parameter(s) are provided in the standard specification, and the UE and / or any network node shall follow or implement these rules and / or methods and / or details.

[0018] The term “configuration” can mean the following: one or more rules and / or methods and / or details provided by one or more network entities (e.g., via higher-level signaling, such as Radio Resource Control (RRC) signaling) regarding one or more parameters that the UE should follow or implement, as provided in the standard specification.

[0019] In the current NR standard, the maximum number of reference signals or antenna ports / CSI-RS ports configured in the CSI report and used by the UE for CSI measurements is 32. Recently, some "high" frequency bands (FRs), such as the NR band n104 with a frequency range of 6.425 to 7.125 GHz, have received increasing attention in European deployments. For these bands, new antenna arrays with a greater number of antenna elements or antenna ports are required to maintain uplink / downlink coverage compared to the lower FR1 bands. Therefore, such deployments necessitate increasing the number of CSI-RS ports from 32 to 64 or even 128. However, when the number of antenna ports increases from 32 to 64 or even 128, the complexity of estimating or measuring antenna ports at the UE increases significantly compared to the case of 32 antenna ports. To keep the complexity and CPU usage of estimating or measuring antenna ports or CSI-RS ports at the UE at a reasonable level, some enhancements to CSI measurements and CSI reporting are needed. This disclosure provides methods and apparatus for enhancing CSI measurement and reporting when there is a large number of antennas or CSI-RS ports. Summary of the Invention

[0020] One object of this disclosure is to provide a method and apparatus for CSI feedback reporting during codebook-based precoding in wireless communication networks (e.g., advanced 5G networks).

[0021] According to one aspect of some embodiments of this disclosure, a method performed by a wireless device (e.g., a user equipment UE) is provided, the method comprising: Received from network node: Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as Configuration or indication, wherein the configuration or indication represents M Channel State Information Reference Signal (CSI-RS) resources, wherein each CSI-RS resource includes multiple antenna ports or CSI-RS ports, wherein the antenna ports or CSI-RS ports of each CSI-RS resource are mapped to a subset or proper subset of the row and column indices of the antenna port layout; For each CSI-RS resource, determine entries of precoding vectors associated with a subset or proper subset of the row and column indices of the antenna port layout; Generate a CSI report or CSI feedback report containing a precoding matrix indicator (PMI), wherein the PMI indicates the precoding vector; and The CSI report or the CSI feedback report is reported to the network node.

[0022] According to another aspect of some embodiments of this disclosure, a method performed by a wireless device (e.g., a user equipment UE) is provided, the method comprising: Received from network node: Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as The configuration or indication represents at least one Channel State Information Reference Signal (CSI-RS) resource and the number of subbands, wherein the CSI-RS resource includes multiple antenna ports or CSI-RS ports, and each antenna port or CSI-RS port is associated with the number of subbands, wherein, for a first set of subbands, an antenna port or CSI-RS port is mapped to a first entry of the antenna port layout using a first mapping scheme; and for a second set of subbands, the antenna port or CSI-RS port is mapped to a second entry of the antenna port layout using a second mapping scheme; Determine the entries of the precoding vector associated with the antenna port or CSI-RS port; Generate a CSI report or CSI feedback report containing a precoding matrix indicator (PMI), wherein the PMI indicates the precoding vector; and The CSI report or the CSI feedback report is reported to the network node.

[0023] According to another aspect of the present disclosure, a method performed by a network node is provided for receiving a channel state information (CSI) report from a wireless device in a wireless communication network, the CSI report indicating a precoding matrix, the method comprising: Send to wireless device: Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as The configuration or indication represents M Channel State Information Reference Signal (CSI-RS) resources, wherein each CSI-RS resource includes multiple antenna ports or CSI-RS ports, and the antenna ports or CSI-RS ports of each CSI-RS resource are mapped to a subset or proper subset of the row and column indices of the antenna port layout. So that the wireless device can: For each CSI-RS resource, determine entries of precoding vectors associated with a subset or proper subset of the rows and columns of the antenna port layout; Determine for use RI A precoding matrix for each transport layer, wherein the precoding matrix includes v There are n precoding vectors, and each precoding vector has Each entry is associated with a transport layer; Generate a CSI report or CSI feedback report for transmission to the network node, the report including a precoding matrix indicator (PMI) indicating the precoding vector or precoding matrix; and Uplink control information (UCI), including the CSI report or CSI feedback report, is received from the wireless device via the uplink UL channel.

[0024] According to another aspect of the present disclosure, a method performed by a network node is provided for receiving a channel state information (CSI) report from a wireless device in a wireless communication network, the CSI report indicating a precoding matrix, the method comprising: Send to wireless device: Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as The configuration or indication represents at least one Channel State Information Reference Signal (CSI-RS) resource and the number of subbands, wherein the CSI-RS resource includes multiple antenna ports or CSI-RS ports, and each antenna port or CSI-RS port is associated with the number of subbands, wherein, for a first set of subbands, an antenna port or CSI-RS port is mapped to a first entry of the antenna port layout using a first mapping scheme; and for a second set of subbands, the antenna port or CSI-RS port is mapped to a second entry of the antenna port layout using a second mapping scheme.

[0025] So that the wireless device can: Determine the entries of the precoding vector or precoding matrix associated with the antenna port or CSI-RS port; Generate a CSI report or CSI feedback report for transmission to the network node, the report including a precoding matrix indicator (PMI) indicating the precoding vector or precoding matrix; and Uplink control information (UCI), including the CSI report or CSI feedback report, is received from the wireless device via the uplink UL channel.

[0026] According to another aspect of the embodiments of this disclosure, a wireless device is also provided, the wireless device including a processor and a memory, the memory containing instructions executable by the processor, thereby configuring the wireless device to perform any of the embodiments described herein in relation to the operations performed by the wireless device.

[0027] According to another aspect of the present disclosure, a network node is also provided, the network node including a processor and a memory, the memory containing instructions executable by the processor, thereby configuring the network node to perform any of the embodiments related to the network node described in the detailed embodiments herein.

[0028] A computer program is also provided, including instructions that, when executed on at least one processor of a wireless device, cause the at least one processor to perform the operations or method steps described herein.

[0029] A computer program is also provided, including instructions that, when executed on at least one processor of a network node, cause the at least one processor to perform the operations or method steps described herein.

[0030] A carrier is also provided, which carries the computer program, wherein the carrier is one of a computer-readable storage medium, an electrical signal, an optical signal, or a radio signal.

[0031] One advantage of this disclosure is that, as described in the specific embodiments, when the number of antennas or CSI-RS ports is large, it significantly reduces the complexity and CPU usage of the UE in estimating or measuring the antenna ports or CSI-RS ports.

[0032] Note that in this disclosure, the terms antenna port and CSI-RS port are used interchangeably.

[0033] Other advantages of the embodiments of this disclosure are set forth in the detailed description herein. Attached Figure Description

[0034] Embodiments of the invention will now be described in more detail with reference to the accompanying drawings, in which: Figure 1 A schematic diagram of a wireless communication system to which embodiments of this article may be applied is shown; Figure 2 A block-based model of MIMO DL transmission using codebook-based precoding is shown according to LTE version 8; Figure 3 A flowchart illustrating a method performed by a wireless device (e.g., a UE) according to some embodiments herein is shown; Figure 4A flowchart illustrating a method performed by a network node (e.g., a gNB) according to some embodiments herein is shown; Figure 5 It shows having column sum A structural example of an antenna port layout; Figure 6 This diagram illustrates an example of the CSI-RS port-to-antenna port layout for M=2 CSI-RS resources when interleaving is off, where each CSI-RS resource is associated with R=3 rows and all columns; Figure 7 This shows the mapping of CSI-RS port to antenna port layout for M=2 CSI-RS resources when interleaving is enabled, where each CSI-RS resource is associated with R=3 rows and all columns; Figure 8 The diagram shows the mapping of CSI-RS port to antenna port layout for M=2 CSI-RS resources when interleaving is off, where each CSI-RS resource is associated with C=4 columns and all rows; Figure 9 This shows the mapping of CSI-RS port to antenna port layout for M=2 CSI-RS resources when interleaving is enabled, where each CSI-RS resource is associated with C=4 columns and all rows; Figure 10 The diagram shows the mapping of CSI-RS port to antenna port layout for M=4 CSI-RS resources when interleaving is off, where each CSI-RS resource is associated with C=4 columns and R=3 rows; Figure 11 The diagram shows the mapping of the CSI-RS port to antenna port layout for M=4 CSI-RS resources when interleaving is enabled, where each CSI-RS resource is associated with C=4 columns and R=3 rows; Figure 12 This is a block diagram describing a wireless device (e.g., a UE) according to exemplary embodiments herein; Figure 13 This is a block diagram describing a network node (e.g., a gNB) according to exemplary embodiments herein; Figure 14 A schematic diagram of the CSI-RS port mapping for M=2 CSI-RS resources is shown; Figure 15 A schematic diagram showing the mapping of CSI-RS ports for the first and second subsets of CSI-RS resources with M=2 CSI-RS resources is provided. Detailed Implementation

[0035] In the following description, exemplary embodiments are described in detail with reference to the accompanying drawings, using multiple scenarios to facilitate a clearer understanding of the solutions described herein.

[0036] In some embodiments, parameters and The network node indicates to the UE the first dimension or column of the antenna port layout at the network node, and the number of the second dimension or rows, respectively. In some options, and The value is passed through higher-level parameters n1-n2 To configure. Antenna port layout includes One antenna port, of which the antenna port The antenna port is associated with the first polarization of the antenna port layout. This is associated with the second polarization of the antenna port layout. Figure 5 It shows having column sum The structure of the antenna port layout, where each entry in the layout represents a dual-polarized antenna element associated with two antenna ports. Each antenna port associated with either the first or second polarization has a row index in the antenna port layout. and column indexes Related, among which, and .

[0037] It should be noted that in the following text, antenna port and CSI-RS port are used interchangeably. Additionally, note that precoding vector and precoding matrix are used interchangeably. Precoding matrix and precoding matrix are also used interchangeably. When used alone, the term "precoder" refers to, but is not limited to, precoding matrix or precoder matrix.

[0038] In some embodiments, the wireless device determines for v Each transport layer has a precoder or precoding vector or matrix, and the CSI report indicates the precoder or precoding vector or matrix. The symbol RI indicates the number of transport layers.

[0039] In some embodiments, the precoding matrix includes v There are n precoding vectors, where each precoding vector has Each entry is associated with a transport layer. In some embodiments, the number of transport layers is the same as the number of precoding vectors, i.e., RI = v Each precoding vector consists of one or more DFT-based vectors. In the following text, a precoding vector is represented as a vector. (Notice, index It is a general index and may not depend on the specific definition of the precoding vector. As an example, for antenna port layout... There are antenna ports, and the r-th layer... The precoding vector is given by the following formula:

[0040] in, It is an oversampled DFT-based vector, defined as:

[0041] in, ,for Used at that time; for Then take , in, This represents the phase value from an 8-PSK (N=3), a 16-PSK (N=4), or any higher-order PSK. Here, vectors in Antenna ports with first polarization and antenna port layout Related, vectors in Antenna ports with second polarization and antenna port layout Related. Vector From size The vector is selected from the oversampled 2D-DFT codebook. The codebook includes indices of vectors or indicator vectors. The UE can select a vector from the codebook and indicate the selected vector or the index of the selected vector (i.e., the precoded vector) in the CSI report. Each vector in the 2D-DFT codebook is represented as... ,in ,as well as ,and and These are the oversampling factors relative to the first dimension (column) and the second dimension (row) of the antenna port layout, respectively.

[0042] Generally, and It is a positive integer. In some examples, and / or .

[0043] vector Each entry is associated with a row index of the antenna port layout. Related. DFT-based vectors. Each entry and including column sum Column / column index of the antenna port layout of the row and row / row index Related. Vector The Column / column index for each entry and antenna port layout and row / row index Related, among which, ,and .

[0044] As an example, for antenna port layout There are antenna ports, and the r-th layer... The precoding vector is given by the following formula:

[0045] in, It is an oversampled DFT-based vector, defined as:

[0046] in, ,for Used at that time; for Then take , in, This represents the phase value from an 8-PSK, 16-PSK, or any higher-order PSK. Here, vectors in With antenna port Related, vectors in With antenna port Related, vectors in With antenna port Related, vectors in With antenna port Related. This vector. From size The vector is selected from the oversampled 2D-DFT codebook. Each vector in the 2D-DFT codebook is represented as... ,in , ,and and These are the oversampling factors relative to the first dimension (column) and the second dimension (row) of the antenna port layout, respectively.

[0047] It should be noted that, and All are positive integers. Generally, and All are greater than or equal to 1. In some cases, and / or .

[0048] In some embodiments, each of the plurality of precoding vectors or matrices is represented by a linear combination of spatial and frequency domain components, and a set of combination / merging coefficients for combining the spatial and frequency components, as described herein. The plurality of precoding vectors or matrices can be indicated in a CSI report by indicating the spatial and frequency components and the set of linear combination coefficients.

[0049] In this disclosure, the terms "combination coefficient" and "merging coefficient" are used interchangeably.

[0050] Precoding vectors or matrices can be used in multiple subbands The bandwidth of a DL channel can be divided into multiple subbands, where each precoding vector or matrix is ​​associated with one subband. In some embodiments, the number of subbands of the precoder is an integer multiple (or a real multiple less than 1) of the number of CQI subbands configured for the wireless device. The number of subbands or CQI subbands can be indicated to the wireless device via CSI report configuration.

[0051] Precoding vectors or matrices are determined by a wireless device based on measurements of received reference signals (e.g., CSI-RS), provided by another wireless device or network node. The reference signals are configured to be provided to the wireless device via a CSI report configuration. The wireless device is configured to perform CSI measurements on one or more configured CSI-RS resources, determine precoding vectors or matrices based on the CSI measurements, and indicate them in the CSI report.

[0052] Spatial components of the precoder In some embodiments, the wireless device or UE is configured to determine one or more spatial (SD) components for a set of linear combination coefficients of a precoder. Each SD component corresponds to a basis vector. A set of SD components may correspond to a first basis set. To determine a precoding vector or matrix, the wireless device or UE is configured to select one or more SD components from the first basis set. The basis vectors from the first basis set are associated with a set of antenna ports or CSI-RS ports of CSI-RS resources. This set of antenna ports or CSI-RS ports may be associated with a first polarization and a second polarization. The first set of antenna ports or CSI-RS ports may be associated with a first polarization, and the second set of antenna ports or CSI-RS ports may be associated with a second polarization. The selection of one or more basis vectors (one or more SD components) from the first basis set may be polarization-common or polarization-specific. In the case of a polarization-common selection, the basis vectors selected from the first basis set are common to both polarizations of the antenna ports or CSI-RS ports configured for the wireless device. In the case of a polarization-specific selection, the basis vectors selected from the first basis set are independently selected by the wireless device for both polarizations of the antenna ports or CSI-RS ports configured for the wireless device. In one exemplary embodiment, the wireless device selects a precoding vector or matrix from a first base set. The selected basis vectors are indicated in the CSI report. There are basis vectors. In some examples, the selected... The basis vectors are polarization common, and therefore identical for the first antenna port and the second antenna port or CSI-RS port group. In some examples, the selected... The basis vectors are polarization-dependent, therefore they may differ for the first antenna port or CSI-RS port group and the second antenna port or CSI-RS port group. In some examples, the selected... The basis vectors are layer-dependent and differ for a subset of transport layers or for each transport layer of the precoder. In this case, the basis vectors are chosen independently for each subset of layers or for each layer of the precoder. In some other examples, the chosen basis vectors... The basis vectors are layer-independent and are the same for all layers of the precoder.

[0053] In some embodiments, the first basis set is an orthogonal basis set, i.e., the basis set includes multiple orthogonal basis vectors. For example, the first basis set is a DFT-based or DCT-based basis set. In some embodiments, the first basis set is defined by a DFT or IDFT basis set, or an oversampled DFT or IDFT basis set. In some embodiments, the first basis set includes a set of vectors based on the Discrete Cosine Transform (DCT). When the first basis set is defined by a DFT-based (DFT or IDFT) basis set, the first basis set is represented by a DFT or IDFT matrix. In some embodiments, the first basis set is defined by a rotated DFT-based basis, wherein the indices of the DFT-based vectors are determined by... , Definition, where It is the twitch factor corresponding to the rotated DFT-based basis. and These represent the antenna ports relative to the first and second dimensions, respectively. and Let represent the oversampling factors relative to the first and second dimensions, respectively. In this case, the rotated DFT-based basis is selected from oversampled DFT-based bases, which contain _____. A DFT-based vector. The rotation factor can be selected by the wireless device, configured by the wireless device, or reported by the wireless device as part of the CSI report. The oversampling factor can be fixed in the 3GPP specification and is therefore known to the wireless device. Two parameters. and This can depend on the CSI-RS resources, and can vary depending on the CSI-RS resources indicated in the CSI reporting configuration.

[0054] In some embodiments, the first basis set is an orthogonal basis set, meaning that the basis set includes multiple orthogonal basis vectors, each of size 1. or The vector is associated with a CSI-RS port and includes or One 0 and one 1, where, or (For example, each antenna port polarization) is the number of antenna ports in one or more antenna port groups. In some examples, It can depend on CSI-RS resources, and can be different for different CSI-RS resources.

[0055] Frequency domain components of the pre-encoder In some embodiments, the wireless device or UE is configured to determine one or more frequency domain (FD) components for a set of linearly combined coefficients of the precoder. Each FD component of the precoder corresponds to a basis vector. A set of FD components corresponds to a second basis set. To determine the precoding vector or matrix, the wireless device is configured to select one or more FD components (i.e., basis vectors) from the second basis set. The basis vectors from the second basis set are then compared with multiple subbands of the DL channel bandwidth. Associated. A subband can include multiple Physical Resource Blocks (PRBs). In some embodiments, the number of subbands... It depends on the number of CQI subbands or the size of the CQI subbands configured for the wireless device.

[0056] In some embodiments, the second basis set is defined by an orthogonal basis set, i.e., the basis set includes multiple orthogonal vectors. For example, the second basis set is a DFT-based or DCT-based basis. In some embodiments, the second basis set is defined by a DFT or IDFT basis, or an oversampled DFT or IDFT basis. In some embodiments, the second basis set includes a set of vectors based on the Discrete Cosine Transform (DCT). When the second basis set is defined by a DFT-based (DFT or IDFT) basis, the second basis set can be represented by a DFT or IDFT matrix. In some embodiments, the second basis set is defined by a rotated DFT-based basis, wherein the indices of the DFT-based vectors are determined by... Define, where, This is the rotation factor corresponding to the rotated DFT-based basis. In this case, the rotated DFT-based basis is selected from the oversampled DFT-based basis, which contains... A DFT-based vector. This means that the basis set corresponding to the frequency domain components is an oversampled DFT or DCT-based matrix, including... An orthogonal DFT- or DCT-based matrix. This rotation factor can be selected by the wireless device, configured by the wireless device, or reported by the wireless device as part of a CSI report. In some embodiments, the number of frequency domain subbands defines the length of the basis vectors of the second basis set. The number of frequency domain subbands can be indicated to the wireless device (e.g., through a higher layer), or it can be fixed in the NR specification and known to the wireless device, or it can be selected by the wireless device and indicated in the CSI report.

[0057] In some embodiments, the set of FD components is a basis set represented by a DFT-based or DCT-based matrix, or an oversampled DFT-based or DCT-based matrix, and the basis set includes multiple basis vectors representing the FD components, and each basis vector is a DFT-based or DCT-based vector.

[0058] In some embodiments, the basis vector set of the FD components is an oversampled DFT or DCT-based matrix, including... An orthogonal matrix based on DFT or DCT.

[0059] In some embodiments, the wireless device targets cross-... The precoding matrix or vector of each CSI-RS resource selects N FD components from the second basis set, where, >1.

[0060] In some embodiments, the wireless device selects N FD components from a second basis set for each CSI-RS resource's precoding matrix or vector, wherein, >1.

[0061] In some embodiments, parameter N is configured for the wireless device, which selects and reports it to network nodes, such as... Another parameter is derived, or is fixed in the 3GPP NR specification and therefore known to the wireless device.

[0062] In the current NR specification, the number of antenna ports or CSI-RS ports is limited to 32, and the antenna port layout... and Support combinations are These configurations are primarily for sub-6 GHz (frequency range 1, FR1) deployments. Recently, some "high" FR bands, such as the NR band n104 with a frequency range of 6.425 to 7.125 GHz, have received increasing attention in European deployments. For these bands, compared to the lower FR1 bands, new antenna arrays or antenna port layouts with a greater number of antenna elements or antenna ports are required to maintain uplink / downlink coverage. Note that, in principle, the current NR standard supports... and The combination and number of antenna ports can be reused for "high" FR1 band antenna arrays by grouping multiple antenna ports into subarray sets, where each subarray is associated with one or more antenna ports. However, this approach obviously reduces the angular range coverage of the antenna array; therefore, it is desirable to increase the number of antenna ports in the NR standard and introduce new antenna port layout configurations for the new band.

[0063] As the number of antenna ports increases from 32 to 64 or even 128, the complexity of estimating or measuring antenna ports at the UE increases significantly compared to the case of 32 antenna ports (which is the maximum number of antenna ports supported in the current NR specification). To reduce the complexity and CPU usage of estimating or measuring antenna ports at the UE, this invention proposes grouping or segmenting CSI-RS or antenna ports into multiple subsets. These subsets are further referred to as CSI-RS resources. CSI-RS resources are time-division multiplexed (TDM) and / or frequency-division multiplexed (FDM) by network nodes and transmitted sequentially over multiple symbols and / or time slots. The UE receives and processes the TDM (and / or FDM) CSI-RS resources sequentially over time, thereby reducing the complexity and CPU usage of estimating or measuring a large number of antenna ports. In this way, the UE can measure or estimate 64 or even 128 antenna ports. Based on the CSI measurements, the UE calculates a precoding vector or matrix and generates a CSI report including a precoding matrix identifier (PMI) indicating the precoding vector or matrix. CSI reports are transmitted via uplink or channel to network nodes, such as gNBs.

[0064] CSI-RS resource configuration To reduce the complexity of CSI calculation at the UE, it is proposed to use the UE for CSI measurement. Each antenna port or CSI-RS port is segmented into M non-overlapping subsets or proper subsets, where each subset is associated with a CSI-RS resource. This means that each CSI-RS resource contains A subset of antenna ports, where the antenna port of the i-th CSI-RS resource is different from the antenna port of the j-th CSI-RS resource. , ,and The antenna port of a given CSI-RS resource is mapped to a set of row and column indices of the antenna port layout, which do not overlap with or are completely different from the set of row and column indices associated with the antenna port of any other CSI-RS resource.

[0065] Optionally, the UE is configured with P antenna ports or CSI-RS ports, and each CSI-RS resource is associated with the same P antenna ports or CSI-RS ports, or with a subset or proper subset of the P antenna ports or CSI-RS ports. The antenna ports of a given CSI-RS resource are mapped to a set of row and column indices of the antenna port layout. In some cases, the entries (i.e., row and column indices) associated with the antenna ports of a given CSI-RS resource do not overlap or are completely different from the entries (i.e., row and column indices) associated with the antenna ports of another CSI-RS resource. Here, it is assumed that the antenna port layout includes... Each entry (or pair / location) is associated with two antenna ports configured in the CSI-RS resource. In some examples, In some cases, the antenna port of the first CSI-RS resource... Same antenna port as the second CSI-RS resource The antenna ports of the two CSI-RS resources are associated with the same entries in the antenna port layout (i.e., the same row and column indices). The antenna ports of the two CSI-RS resources may be associated with the same polarization. Note that this configuration allows the wireless device to estimate and correct for phase and / or amplitude variations of the antenna ports over time. In some cases, the antenna ports of the first CSI-RS resource associated with the first polarization and the antenna ports of the second CSI-RS resource associated with the second polarization are associated with the same entries in the antenna port layout (i.e., the same row and column indices).

[0066] Optionally, the UE is configured with P antenna ports or CSI-RS ports, and each CSI-RS resource is associated with the same P antenna ports or CSI-RS ports, or with a subset or proper subset of the P antenna ports or CSI-RS ports. In one option, the antenna ports of a given CSI-RS resource are mapped to a set of entries in a precoding vector or matrix that does not overlap with or is completely different from the set of entries in the precoding vector or matrix associated with the antenna ports of any other CSI-RS resource. Here, it is assumed that the precoding vectors include... Each entry is associated with an antenna port configured in a CSI-RS resource. Alternatively, the antenna ports of a given CSI-RS resource are mapped to a set of entries in a precoding vector or matrix, which is partially identical to the set of entries in the precoding vector or matrix associated with the antenna ports of any other CSI-RS resource. Here, at least one antenna port of the first CSI-RS resource... Same antenna port as the second CSI-RS resource The same entry in the precoding vector is associated with the antenna ports of the two CSI-RS resources.

[0067] In some embodiments, the UE is configured with M CSI-RS resources or a set of M CSI-RS resources. The UE receives a given CSI-RS resource on a set of one or more symbols that do not overlap or intersect with symbols that receive at least one other M configured CSI-RS resource.

[0068] In some embodiments, the UE is configured with M CSI-RS resources or a set of M CSI-RS resources. The UE receives a given CSI-RS resource on a set of one or more symbols that partially overlap or intersect with symbols receiving at least one other configured CSI-RS resource.

[0069] In some embodiments, the UE is configured with M CSI-RS resources or a set of M CSI-RS resources. The UE receives a given CSI-RS resource on a set of one or more symbols that do not overlap or intersect with the symbols receiving any other M configured CSI-RS resources. This means that the M resources are received on M distinct / non-overlapping symbol sets, i.e., the M resources are time-division multiplexed (TDM). The M resources may be received on one or more time slots.

[0070] In one example, M (M=4) resources are configured for the UE, with two resources in time slots. The first resource was received, while the other two resources were in the time slot. The M (M=4) resources are received by M=4 different symbol sets. In another example, M resources are configured, where the m-th resource is in a time slot. It was received.

[0071] In some embodiments, M CSI-RS resources are received sequentially across multiple time slots. This reduces the complexity for the UE to measure antenna ports or CSI-RS ports from a given resource or point in time, as CSI measurements are performed sequentially over time. This allows for the use of "large" antenna port layouts at network nodes, i.e., antenna arrays equipped with or associated with a large number of antenna ports (e.g., 64 or 128).

[0072] In some embodiments, antenna ports and / or CSI resources are indicated to the UE by the network node via a higher layer (e.g., via CSI report configuration).

[0073] In some embodiments, the number of CSI-RS ports or antenna ports is configured to be the same for all M CSI-RS resources.

[0074] In some embodiments, the UE is configured with one or more resource sets, each resource set comprising M CSI-RS resources, where M > 1. The m-th CSI-RS resource (m = 0, …, M-1) is associated with multiple antenna ports or CSI-RS ports. In a first option, the UE is configured with the same number of CSI-RS ports for all resources. In a second option, the number of CSI-RS ports configured for at least one resource differs from the number of CSI-RS ports configured for at least one other CSI-RS resource in the resource set.

[0075] In some embodiments, the UE is configured with Q (Q > 1) CSI-RS resource sets, wherein the q-th CSI-RS resource set includes There are q-th CSI-RS resources, and the m-th CSI-RS resource in the q-th CSI-RS resource set includes... One CSI-RS port, of which and In some examples, the number of CSI-RS ports in the Q resource sets. They can be the same or different. In some examples, the number of CSI-RS resources in the Q resource sets... They can be the same or different.

[0076] In some embodiments, for all CSI-RS resources in a given CSI-RS resource set, it is assumed that they satisfy a quasi-co-location (QCL) relationship with the same downlink reference signal (DL RS) in terms of QCL type "D". In some examples, the RS can be an SSB, a CSI-RS resource configured with "repeated", or a CSI-RS resource used for tracking (i.e., a CSI-RS configured with "trsInfo").

[0077] In some embodiments, for all CSI-RS resources in a given CSI-RS resource set, it is assumed that they satisfy a quasi-co-location (QCL) relationship with the same downlink reference signal (DL RS) in terms of QCL type "A" or QCL type "C". In some examples, this RS may be a synchronization signal block (SSB) or a CSI-RS used for tracking.

[0078] In some embodiments, all CSI-RS resources in a given CSI-RS resource set have the same TCI state and / or QCL assumptions. This may mean assuming that all CSI-RS resources satisfy quasi-colocation (QCL) relationships with one or more DL RSs in terms of the same QCL type.

[0079] Mapping of row / column indices from antenna port to antenna port layout In some embodiments, the CSI-RS ports of a CSI-RS resource are associated with a proper subset of the rows and columns of the antenna port layout. In some options, the CSI-RS ports of a CSI-RS resource are associated with a proper subset of the columns and all rows. In some other options, the CSI-RS ports of a CSI-RS resource are associated with a proper subset of the rows and all columns.

[0080] CSI-RS port-to-antenna port layout for M CSI-RS resources column sum The row mapping information (i.e., the association between the row and column indices of the antenna ports and their layout) must be known to the UE, or the mapping information should be indicated to the UE (e.g., via an indication from a network node). In one option, the mapping information is indicated to the UE via RRC signaling from the network node. In another option, the mapping information is fixed in the NR specification and is directly known to the UE. The CSI-RS port-to-antenna port layout of the M resources... column sum The mapping between rows can also be determined by the UE based on one or more parameters indicated by it.

[0081] In some embodiments, the UE is configured with parameters , This indicates the number of CSI-RS ports in the first dimension, or the number of columns in the antenna port layout, which is associated with the CSI-RS resource. In one option, configuration is provided for each CSI-RS resource. The value is given to the UE. In another option, The value is the same for all CSI-RS resources and is configured once for all CSI-RS resources in a resource set.

[0082] In some embodiments, the UE is configured with parameters , This indicates the number of antenna ports in the second dimension or the row number of antenna port layouts associated with a CSI-RS resource. In one option, it configures for each m-th CSI-RS resource. The value. In another option, The value is the same for all CSI-RS resources and is configured once for all CSI-RS resources in the resource set.

[0083] In some embodiments, the UE is configured with parameters and These represent the number of antenna ports or columns in the first dimension and the number of antenna ports or rows in the second dimension, respectively. CSI-RS resources are associated with these parameters. In one option, configuration is provided for each m-th CSI-RS resource. and The value. In another option, and The value is the same for all CSI-RS resources (in this case, and , ), and configure all CSI-RS resources in the resource set once.

[0084] In some embodiments, the UE is configured with parameters ,and The value is determined by the UE. In some embodiments, the UE is configured with parameters. ,and The value is determined by the UE. ,in, It represents the number of CSI-RS ports for the m-th CSI-RS resource.

[0085] In some embodiments, the UE is configured with parameters ,and, The value is determined by the UE. ,in It is a real number. This represents the number of CSI-RS ports for the m-th CSI-RS resource. In some embodiments, the UE is configured with parameters... ,and, The value is determined by the UE. In some examples, This could mean .

[0086] In some embodiments, the number of antenna ports in the first dimension of the antenna port layout The number of antenna ports in the second dimension This applies to all M CSI-RS resources associated with one or more resource sets.

[0087] In the following embodiment, an approach is proposed to map the antenna ports of M CSI-RS resources to a precoding vector. Different mapping schemes for the entries.

[0088] In some embodiments, each antenna port of the CSI-RS resource has 3000+ values ​​or indices. Related, among which, It is an integer value. In the following example, the p-th port or the p-th antenna port therefore refers to antenna port 3000+. .

[0089] Configuration 1 In some embodiments, the CSI-RS port of each CSI-RS resource is associated with a single row and all columns of the antenna port layout. In some examples, the p-th port of the CSI-RS resource is associated with a vector. The Each entry is associated with another, among which, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0090] In some embodiments, the antenna port of each CSI-RS resource is associated with R consecutive rows and all columns of the antenna port layout. In one example, the p-th port is associated with a vector The Each entry is associated with another, among which, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. In another example, the p-th port is associated with the vector. The Each entry is associated with another, among which, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively. In some examples, R=1 or R=2. .

[0091] Configuration 2 In some embodiments, the CSI-RS port of each CSI-RS resource is associated with all rows and one column of the antenna port layout. In some examples, the p-th port of the CSI-RS resource is associated with a vector. The Each entry is associated with another, among which, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. At this point, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0092] In some embodiments, the antenna port of each CSI-RS resource is associated with all rows and C consecutive columns. In one example, the p-th port is associated with a vector. The Each entry is associated with another, among which, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. In another example, the p-th port is associated with the vector. The Each entry is associated with another, among which, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively. In some examples, C=1 or C=2. In some examples, .

[0093] Configuration 3 In some embodiments, the CSI-RS port of each CSI-RS resource is associated with R consecutive rows and C consecutive columns of an antenna port layout, wherein and In the first example, the p-th port of the CSI-RS resource is related to the vector. The Each entry is associated. In the second example, the p-th port is associated with the vector. The Each entry is associated. In the third example, the p-th port is associated with the vector. The Each entry is associated. In the fourth example, the p-th port is associated with the vector. The These entries are related. Here, It is a CSI-RS resource index. It is a CSI-RS port index associated with CSI-RS resources, where, and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0094] In some examples, the m-th CSI-RS resource is associated with the m-th CSI-RS resource index. In other examples, the CSI-RS resource index is mapped to the CSI-RS resource through a mapping or permutation function.

[0095] Until version 18 of the 3GPP New Radio, the maximum number of antenna ports or CSI-RS ports associated with CSI-RS resources was limited to 32. Therefore, when using an antenna port layout with more than 32 antenna elements, multiple CSI-RS resources, each associated with a certain number of antenna ports or CSI-RS ports, are needed to probe all antenna ports of the antenna port layout (in TDM, FDM, or CDM mode). When using multiple CSI-RS resources for channel estimation, the CSI-RS resources can be transmitted in TDM mode, i.e., the CSI-RS resources are transmitted in different time slots. If the CSI-RS resources or antenna ports are mapped to consecutive antenna ports of the antenna port layout, then... Compared to the case where CSI-RS transmission is performed on multiple antenna ports, the aperture size of each CSI-RS transmission is limited to a reduced angular range. This can lead to a degraded channel estimation performance. Therefore, instead of mapping the antenna ports or CSI-RS ports of CSI-RS resources to consecutive antenna ports (fixed aperture size) in an antenna port layout, the aperture size of CSI-RS transmission in each time slot can be increased or enhanced by interleaving the CSI-RS or antenna ports of CSI-RS resources in a uniform or non-uniform manner.

[0096] The following describes some examples of such mappings, in which the first dimension, or the second dimension, or both of the first and second dimensions of the antenna port layout are interwoven.

[0097] Port mapping interleaving Interweaving Option 1: Single-Dimensional Interweaving In some embodiments, the UE is configured with a higher-level parameter "interleaving," which can be set to "on" or "off." In one option, interleaving is set to "on" in one dimension and "off" in another. In another option, interleaving is set to "on" or "off" for both the first (column) and second (row) dimensions of the antenna port layout.

[0098] Interweaving in the second dimension (rows) - Configuration 1 In some embodiments, each CSI-RS resource is associated with R non-contiguous rows and all columns of the antenna port layout, wherein the rows associated with the CSI-RS resource are determined by the antenna port layout. Separated by lines. Within one option, The value is equal to the amount of CSI-RS resources configured for the UE. In another option, The value is configured to the UE or fixed in the NR specification, or determined by the UE based on one or more parameters configured at a higher layer. In yet another option, The value is determined by the UE. In one example, for M=4, R=2, each CSI-RS resource is associated with non-contiguous rows {0,4}, or {1,5}, or {2,6}, or {3,7}, where the interval between the 2 rows associated with the CSI-RS resource is 4. Figure 6 This diagram shows an example of the CSI-RS port-to-antenna port layout for M=2 CSI-RS resources when interleaving is set to "off", where each CSI-RS resource is associated with a row and all columns of R=3. Figure 7 The diagram shows the mapping of CSI-RS port to antenna port layout for M=2 CSI-RS resources when interleaving is set to "on", where each CSI-RS resource is associated with a row and all columns of R=3.

[0099] In some embodiments, the antenna port of each CSI-RS resource is associated with R non-contiguous rows and all columns of the antenna port layout. In one example, the p-th port is associated with a vector The Each entry is associated with another, among which, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. In another example, the p-th port is associated with the vector. The Each entry is associated with another, among which, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively. In some examples, R=1 or R=2. .

[0100] Interweaving in the first dimension (column) – Configuration 2 In some embodiments, each CSI-RS resource is associated with C non-contiguous columns and all rows, wherein the columns of the CSI-RS resource are composed of... Columns are separated. Within one option, The value is equal to the amount of CSI-RS resources configured for the UE. In another option, The value is configured to the UE or fixed in the specification, or determined by the UE based on one or more parameters configured at a higher layer. In yet another option, The value is determined by the UE. In one example, for M=4, C=2, each CSI-RS resource is associated with a non-contiguous column {0,4}, or {1,5}, or {2,6}, or {3,7}, where the interval between the two columns associated with the CSI-RS resource is 4. Figure 8 The diagram shows the mapping of CSI-RS port to antenna port layout for M=2 CSI-RS resources when interleaving is set to "off", where each CSI-RS resource is associated with C=4 columns and all rows. Figure 9 The diagram shows the mapping of CSI-RS port to antenna port layout for M=2 CSI-RS resources when interleaving is set to "on", where each CSI-RS resource is associated with C=4 columns and all rows.

[0101] In some embodiments, the antenna port of each CSI-RS resource is associated with C non-contiguous columns and all rows of the antenna port layout. In one example, the p-th port is associated with a vector The Each entry is associated with another, among which, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. In another example, the p-th port is associated with the vector. The The entries are related, among which It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively. In some examples, or In some examples, .

[0102] Interweaving in the first dimension (column) - Configuration 3 In some embodiments, each CSI-RS resource is associated with R consecutive rows and C non-consecutive columns, wherein the columns of the CSI-RS resource are composed of... Columns are separated. Within one option, The value is equal to the amount of CSI-RS resources configured for the UE. In another option, The value is configured to the UE or fixed in the specification, or determined by the UE based on one or more parameters configured at a higher layer. In yet another option, The value is determined by the UE. In one example, for M=4, C=2, each CSI-RS resource is associated with a non-contiguous column {0,4}, or {1,5}, or {2,6}, or {3,7}, where the interval between the two columns associated with the CSI-RS resource is 4.

[0103] In some embodiments, each CSI-RS resource is associated with a CSI-RS port, R consecutive rows, and C non-consecutive columns of the antenna port layout, wherein, and In the first example, the p-th port of the CSI-RS resource is related to the vector. The Each entry is associated. In the second example, the p-th port is associated with the vector. The Each entry is associated. In the third example, the p-th port is associated with the vector. The Each entry is associated. In the fourth example, the p-th port is associated with the vector. The These entries are related. Here, It is a CSI-RS resource index. It is a CSI-RS port index associated with CSI-RS resources, where, and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0104] Interweaving in the second dimension (rows) - Configuration 3 In some embodiments, each CSI-RS resource is associated with R non-contiguous rows and C consecutive columns, wherein the rows of the CSI-RS resource are... Separated by lines. Within one option, The value is equal to the amount of CSI-RS resources configured for the UE. In another option, The value is configured to the UE or fixed in the specification, or determined by the UE based on one or more parameters configured at a higher layer. In yet another option, The value is determined by the UE. In one example, for M=4, N2=8, R=2, each CSI-RS resource is associated with a non-contiguous row {0,4}, or {1,5}, or {2,6}, or {3,7}, where the interval between the two rows associated with the CSI-RS resource is 4.

[0105] In some embodiments, each CSI-RS resource is associated with a CSI-RS port, R non-contiguous rows, and C consecutive columns of the antenna port layout, wherein, and In the first example, the p-th port is related to the vector. The Each entry is associated. In the second example, the p-th port is associated with the vector. The Each entry is associated. In the third example, the p-th port is associated with the vector. The Each entry is associated. In the fourth example, the p-th port is associated with the vector. The These entries are related. Here, It is a CSI-RS resource index. It is a CSI-RS port index associated with CSI-RS resources, where, and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0106] Interweaving Option 2: Interweaving in the first and second dimensions In some embodiments, each CSI-RS resource is associated with C non-contiguous columns and R non-contiguous rows, wherein the columns of the CSI-RS resource are composed of... Columns are separated, and rows of CSI-RS resources are... Separated by lines. In the first option, The value is given as In the second option, The value is given as In the third option, The value is configured to the UE or fixed in the specification, or determined by the UE based on one or more parameters configured at a higher layer. In the fourth option, The value is configured. The value is determined by the UE based on this. In the fifth option, The value is configured. The value is determined by the UE based on this. In one example, for M=8, , C=4, R=2, each CSI-RS resource is associated with a non-contiguous column {0,2,4,6} or {1,3,5,7}, and a non-contiguous row {0,2} or {1,3}, or {4,6}, or {5,7}, or {0,4}, or {1,5}, or {2,6}, or {3,7}, where the interval between two columns of the CSI-RS resource is 4, and the interval between rows of the CSI-RS resource is 2 or 4.

[0107] Figure 10 The diagram shows the mapping of CSI-RS port to antenna port layout for M=4 CSI-RS resources when interleaving is set to "off", where each CSI-RS resource is associated with a column of C=4 and a row of R=3. Figure 11 The diagram shows the mapping of CSI-RS port to antenna port layout for M=4 CSI-RS resources when interleaving is set to "on", where each CSI-RS resource is associated with a column of C=4 and a row of R=3.

[0108] In some embodiments, the CSI-RS port of each CSI-RS resource is associated with R non-contiguous rows and C non-contiguous columns of the antenna port layout, wherein, and In the first example, the p-th port is related to the vector. The Each entry is associated. In the second example, the p-th port is associated with the vector. The Each entry is associated. In the third example, the p-th port is associated with the vector. The Each entry is associated. In the fourth example, the p-th port is associated with the vector. The These entries are related. Here, It is a CSI-RS resource index. It is a CSI-RS port index associated with CSI-RS resources, where, and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0109] The following presents a mapping scheme for mapping the CSI-RS ports of M CSI-RS resources to columns N1 and rows N2 of the antenna port layout.

[0110] In some embodiments, the antenna ports of CSI-RS resources are associated with a row and all columns of the antenna port layout, wherein the first polarization is associated with... Each CSI-RS port is mapped to the antenna port layout. Columns associated with the second polarization Each CSI-RS port is mapped to the antenna port layout. Columns, and among them, and These are the number of CSI-RS resources and the number of CSI-RS ports associated with those resources.

[0111] In one option, the m-th CSI-RS resource is mapped to the m-th row of the antenna port layout, and the p-th and p-th rows of the m-th CSI-RS resource are... Each CSI-RS port is mapped to the p-th column of the antenna port layout, where , .

[0112] In some embodiments, the antenna ports of the CSI-RS resources are associated with R consecutive rows and all columns of the antenna port layout, wherein the first polarization is associated with Each CSI-RS port is mapped to row R of the antenna port layout. Columns associated with the second polarization Each CSI-RS port is mapped to the same R row of the antenna port layout. Columns, and among them, and These are the number of CSI-RS resources and the number of CSI-RS ports associated with those resources.

[0113] In one example, the two polarizations are pre- The CSI-RS ports are mapped in ascending order to the first row and The next two polarized columns The CSI-RS ports are mapped to the second row in ascending order. Column, and so on, the last of the two polarizations Each CSI-RS port is mapped in ascending order to the last row and all List.

[0114] In another example, the first R CSI-RS ports of the two polarizations are mapped to the first column and R rows in ascending order, the next R CSI-RS ports of the two polarizations are mapped to the second column and R rows in ascending order, and so on, with the last R CSI-RS ports of the two polarizations being mapped to the last column and R rows in ascending order.

[0115] In some embodiments, the CSI-RS port of the CSI-RS resource is associated with all rows and one column, wherein the one associated with the first polarization is... Each CSI-RS port is mapped to the antenna port layout. Line, associated with the second polarization Each CSI-RS port is mapped to the antenna port layout. Okay, and among them and These are the number of CSI-RS resources and the number of CSI-RS ports associated with those resources.

[0116] In one option, the m-th CSI-RS resource is mapped to the m-th column of the antenna port layout, and each p-th and p-th column of the m-th CSI-RS resource... Each CSI-RS port is mapped to the p-th row of the antenna port layout, where... ,and .

[0117] In some embodiments, the CSI-RS port of the CSI-RS resource is associated with all rows and C consecutive columns, wherein the first polarization is associated with Each CSI-RS port is mapped to the antenna port layout. Rows and column C, associated with the second polarization Each CSI-RS port is mapped to the antenna port layout. Rows and column C, and in which and These are the number of CSI-RS resources and the number of CSI-RS ports associated with those resources.

[0118] In one example, the two polarizations are pre- The CSI-RS ports are mapped in ascending order to the first column and... Okay, the next two polarizations The CSI-RS ports are mapped to the second column in ascending order. Okay, and so on, the last of the two polarizations Each CSI-RS port is mapped in ascending order to the last column and OK.

[0119] In another example, the first C C SI-RS ports of the two polarizations are mapped to the first row and C column in ascending order, the next C C C SI-RS ports of the two polarizations are mapped to the second row and C column in ascending order, and so on, with the last C C C SI-RS ports of the two polarizations being mapped to the last row and C column in ascending order.

[0120] In some embodiments, the CSI-RS ports of the CSI-RS resources are associated with R consecutive rows and C consecutive columns of the antenna port layout, wherein, and Among them, the one associated with the first polarization Each CSI-RS port is mapped to row R and column C of the antenna port layout, associated with the second polarization. Each CSI-RS port is mapped to the same R rows and C columns of the antenna port layout, and in which, and These are the number of CSI-RS resources and the number of CSI-RS ports associated with those resources.

[0121] In one example, R=2, C=4, , The UE is configured with 4 CSI-RS resources, each of which includes 16 antenna ports associated with rows {0,1}, or {2,3}, or {1,2}, or {3,0}, and columns {0,1,2,3}, or {4,5,6,7}.

[0122] In some embodiments, the CSI-RS ports of the CSI-RS resources are associated with R non-contiguous rows and C consecutive columns of the antenna port layout, wherein and Among them, the one associated with the first polarization Each CSI-RS port is mapped to row R and column C of the antenna port layout, associated with the second polarization. Each CSI-RS port is mapped to the same R row and the same C column of the antenna port layout, and where, and These are the number of CSI-RS resources and the number of CSI-RS ports associated with those resources.

[0123] In one example, R=2, C=4, , The UE is configured with 4 CSI-RS resources, each of which includes 16 antenna ports associated with rows {0,2} or {1,3} and columns {0,1,2,3} or {4,5,6,7}.

[0124] In some embodiments, the CSI-RS ports of the CSI-RS resources are associated with R non-contiguous rows and C non-contiguous columns of the antenna port layout, wherein and Among them, the one associated with the first polarization Each CSI-RS port is mapped to row R and column C of the antenna port layout, associated with the second polarization. Each CSI-RS port is mapped to the same R row and the same C column of the antenna port layout, and where, and These are the number of CSI-RS resources and the number of CSI-RS ports associated with those resources.

[0125] In one example, R=2, C=4, , The UE is configured with 4 CSI-RS resources, each CSI-RS resource including 16 antenna ports associated with rows {0,2} or {1,3}, and columns {0,2,4,6} or {1,3,5,7}.

[0126] In some embodiments, the CSI-RS ports of the CSI-RS resources are associated with R consecutive rows and C non-consecutive columns of the antenna port layout, wherein, and Among them, the one associated with the first polarization One CSI-RS port is mapped to R rows and C columns of the antenna port layout, and CR CSI-RS ports associated with the second polarization are mapped to the same R rows and C columns of the antenna port layout, and where and These are the number of CSI-RS resources and the number of CSI-RS ports associated with those resources.

[0127] In one example, R=2, C=4, , The UE is configured with 4 CSI-RS resources, each of which includes 16 antenna ports associated with rows {0,1}, or {2,3}, or {1,2}, or {3,0}, and columns {0,2,4,6}, or {1,3,5,7}.

[0128] In one example, the first R CSI-RS ports of the two polarizations are mapped to the first column and R rows in ascending order, the next R CSI-RS ports of the two polarizations are mapped to the second column and R rows in ascending order, and so on, with the last R CSI-RS ports of the two polarizations being mapped to the last column and R rows in ascending order.

[0129] In one example, the first C C SI-RS ports of the two polarizations are mapped to the first row and C column in ascending order, the next C C C SI-RS ports of the two polarizations are mapped to the second row and C column in ascending order, and so on, with the last C C C SI-RS ports of the two polarizations being mapped to the last row and C column in ascending order.

[0130] In some embodiments, the C non-contiguous columns associated with the CSI-RS resource are given by the following formula: ,in, It is a CSI-RS resource index. It is a column index associated with a CSI-RS resource that has column C. This refers to the interleaving parameter in the first dimension. In one example, for M=4, C=2, and Each CSI-RS resource is associated with a non-contiguous column {0,2}, or {1,3}, or {4,6}, or {5,7}, where the interval between consecutive columns associated with a CSI-RS resource is [missing information]. In some examples, In some other examples, In other examples, .

[0131] In some embodiments, the R non-contiguous rows associated with the CSI-RS resource are given by the following formula: ,in, It is a CSI-RS resource index. It is a row index associated with a CSI-RS resource that has R rows. This refers to the interleaving parameter in the second dimension. In one example, for M=4, R=2, Each CSI-RS resource is associated with non-contiguous rows {0,2}, {1,3}, {4,6}, or {5,7}, where the interval between consecutive rows associated with a CSI-RS resource is [missing information]. In some examples, In some other examples, In other examples, .

[0132] In some embodiments, the R non-contiguous rows and C non-contiguous columns associated with the CSI-RS resource are given by the following formulas: ,and ,in, It is a CSI-RS resource index. It is a row index. These are column indexes, corresponding to CSI-RS resources associated with row R and column C, respectively. Here, It is the interleaving parameter in the second dimension. This refers to the interleaving parameter in the first dimension. In one example, for , , , , , ,as well as Each CSI-RS resource is associated with non-contiguous rows {0,2}, or {1,3}, or {4,6}, or {5,7}, and non-contiguous columns {0,2}, or {1,3}, or {4,6}, or {5,7}, where the intervals between the contiguous rows and contiguous columns associated with the CSI-RS resource are as follows: and In some examples, In some other examples, In other examples, In some examples, In some other examples, In other examples, .

[0133] CSI-RS resources associated with a single-polarized antenna port.

[0134] In some embodiments, the CSI-RS ports of the CSI-RS resources are mapped to entries in the antenna port layout associated with single polarization. Note that, with the antenna port layout... lines and The column is associated with the first Each entry (or antenna port) is associated with the first polarization and with the antenna port layout. lines and The rest of the column are related Each entry (or antenna port) is associated with the second polarization. In some examples, for M CSI-RS resources, One CSI-RS resource is mapped to an entry (or antenna port) in the antenna port layout associated with the first polarization, and the rest... Each CSI-RS resource is mapped to an entry (or antenna port) of the antenna port layout associated with the second polarization.

[0135] The following section presents different mapping schemes for mapping the antenna ports of M CSI-RS resources to entries of the precoding vector.

[0136] Configuration 1 In some embodiments, the antenna port of each CSI-RS resource is associated with R consecutive rows and all columns of the antenna port layout. In one example, the p-th port of the CSI-RS resource is associated with the p-th port of the precoding vector. The p-th port is associated with the p-th entry in the precoded vector. Each entry is associated. In the example above, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively. In some examples, R=1 or R=2. .

[0137] Configuration 2 In some embodiments, the antenna port of each CSI-RS resource is associated with all rows and C consecutive columns. In one example, the p-th port of the CSI-RS resource is associated with the p-th port of the precoding vector. The p-th port is associated with the p-th entry in the precoded vector. Each entry is associated. In the example above, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively. In some examples, C=1 or C=2. In some examples, .

[0138] Configuration 3 In some embodiments, the CSI-RS port of each CSI-RS resource is associated with R consecutive rows and C consecutive columns of the antenna port layout, wherein, and In the first example, the p-th port is related to the precoding vector. The p-th port is associated with the p-th entry. In the second example, the p-th port is associated with the p-th entry in the precoding vector. The entries are associated. In the example above, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, ) and RC represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0139] The following describes some examples of mappings that are interleaved in the first dimension, the second dimension, or both the first and second dimensions.

[0140] Interweaving in the second dimension (rows) - Configuration 1 In some embodiments, the CSI-RS port of each CSI-RS resource is associated with R non-contiguous rows and all columns of the antenna port layout, wherein In some examples, the p-th port of the CSI-RS resource is related to the p-th port of the precoding vector. These entries are related. Here, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0141] Interweaving in the first dimension (column) – Configuration 2 In some embodiments, the CSI-RS port of each CSI-RS resource is associated with all rows and C non-contiguous columns of the antenna port layout, wherein In some examples, the p-th port is related to the p-th port of the precoding vector. These entries are related. Here, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0142] Interweaving in the first dimension (column) – Configuration 2 In some embodiments, the CSI-RS port of each CSI-RS resource is associated with R consecutive rows and C non-consecutive columns of the antenna port layout, wherein and In some examples, the p-th port is related to the p-th port of the precoding vector. These entries are related. Here, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0143] Interweaving in the second dimension (rows) - Configuration 1 In some embodiments, the CSI-RS port of each CSI-RS resource is associated with R non-contiguous rows and C consecutive columns of an antenna port layout, wherein and In some examples, the p-th port is related to the p-th port of the precoding vector. These entries are related. Here, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0144] The interweaving of the first and second dimensions – Configuration 3 In some embodiments, the CSI-RS port of each CSI-RS resource is associated with R non-contiguous rows and C non-contiguous columns of the antenna port layout, wherein and In the first example, the p-th port is related to the precoding vector. These entries are related. Here, It is a CSI-RS resource index. This is the CSI-RS port index associated with the CSI-RS resource. Here, (Right now, )and These represent the total number of CSI-RS resources and the total number of CSI-RS ports associated with each resource, respectively.

[0145] Non-uniform interweaving In some embodiments, the antenna port layout includes lines and In this case, the UE is configured with two CSI-RS resources. Each antenna port of the CSI-RS resource is mapped to an antenna port or an entry in the antenna port layout (defined by row and column indices). The mapping of antenna ports of the CSI-RS resources to entries in the antenna port layout follows an interleaving scheme as explained below. Assume there are two distinct sets of row / row indices. and Each set includes A non-contiguous row / row index. As an example, the first set includes row / row indices. The second set includes row / row indexes. With the first set The entries for the antenna port layout associated with the row / row index and the first column index are associated with the antenna ports of the first CSI-RS resource. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the row / row index and the first column index are associated with the antenna ports of the second CSI-RS resource. (This is in contrast to entries from the first set.) The entries associated with the row / row index and the second column index are associated with the antenna ports of the second CSI-RS resource. This is related to entries from that second set. The entries associated with the row / row index and the second column index are associated with the antenna port of the first CSI-RS resource, and so on. Figure 14 As an example, for , For M=2 CSI-RS resources, the entries for the antenna port layout are associated with the antenna ports of the CSI-RS resources. For M=2 CSI-RS resources, the entries associated with the two rows {0,2} in the first column are associated with the antenna ports of the first CSI-RS resource, and the entries associated with the two rows {1,3} in the same first column are associated with the antenna ports of the second CSI-RS resource. Similarly, associations are defined for the third, fifth, and seventh columns. The entries associated with the row {0,2} in the second column are associated with the antenna ports of the second CSI-RS resource, and the entries associated with the row {1,3} in the second column are associated with the antenna ports of the first CSI-RS resource. Similarly, associations are defined for the fourth, sixth, and eighth columns. Note that the interleaving distance between the entries associated with the rows of the antenna port layout and the entries associated with the antenna ports of the CSI-RS resources is 2.

[0146] In some embodiments, the antenna port layout includes lines and In this case, the UE is configured with four CSI-RS resources. Similar to the above, each antenna port of a CSI-RS resource is mapped to an antenna port or an entry in the antenna port layout (defined by row and column indices). The mapping of antenna ports of CSI-RS resources to entries in the antenna port layout also follows an interleaving scheme as explained below. Assume there are four distinct sets of column / column indices. , , and Each set includes A non-contiguous column / column index. As an example, the first set includes column / column indexes. The second set includes columns / column indexes. The third set includes columns / column indexes. The fourth set includes columns / column indexes. With the first set The column / column index and the first row index are associated with the antenna port layout entries, which are associated with the antenna ports of the first CSI-RS resource. (This is related to entries from the second set.) The entries for the antenna port layout associated with the column / column index and the first row index are all associated with the antenna ports of the second CSI-RS resource. (This is in contrast to entries from the third set.) The column / column index and the first row index are associated with the antenna port layout entries, which are associated with the antenna ports of the third CSI-RS resource. (This is related to entries from the fourth set.) The entries for the antenna port layout associated with the column / column index and the first row index are all associated with the antenna ports of the fourth CSI-RS resource. (This is in contrast to entries from the first set.) The column / column index and the second row index are associated with the antenna port layout entries and are linked to the antenna ports of the fourth CSI-RS resource. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the column / column index and the second row index are all associated with the antenna ports of the first CSI-RS resource. (This is in contrast to entries from the third set.) The entries for the antenna port layout associated with the column / column index and the second row index are all associated with the antenna ports of the second CSI-RS resource. (This is in contrast to entries from the fourth set.) The entries for the antenna port layout associated with the column / column index and the second row index are all associated with the antenna ports of the third CSI-RS resource. (This is in contrast to entries from the first set.) The entries for antenna port layouts associated with the column / column index and the third row index are all associated with the antenna ports of the third CSI-RS resource. (This is in contrast to entries from the second set.) The entries for antenna port layouts associated with the column / column index and the third row index are all associated with the antenna ports of the fourth CSI-RS resource. (This is related to entries from the third set.) The entries for antenna port layouts associated with the column / column index and the third row index are all associated with the antenna ports of the first CSI-RS resource. (This is in contrast to entries from the fourth set.) The entries for the antenna port layout associated with the column / column index and the third row index are associated with the antenna ports of the second CSI-RS resource. (This is in contrast to entries from the first set.) The second set The third set and the fourth set The entries associated with the column / column index and the fourth row index of the antenna port layout are respectively associated with the antenna ports of the second, third, fourth and first CSI-RS resources, and so on.

[0147] In some embodiments, the antenna port layout includes lines and The UE is configured with two CSI-RS resources. Each antenna port of the CSI-RS resource is mapped to an antenna port or an entry in the antenna port layout (defined by row and column indices). The mapping of antenna ports of the CSI-RS resources to entries in the antenna port layout follows an interleaving scheme as described below. It is assumed that there are two distinct sets of column / column indices. and Each set includes A non-contiguous column / column index. As an example, the first set includes column / column indexes. The second set includes columns / column indexes. With the first set The column / column index and the first row index associated with the antenna port layout entries are associated with the antenna ports of the first CSI-RS resource. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the column / column index and the first row index are associated with the antenna ports of the second CSI-RS resource. (This is related to the first set.) The entries associated with the column / column index and the second row index are associated with the antenna ports of the second CSI-RS resource. (This is related to entries from the second set.) The entries associated with the column / column index and the second row index are associated with the antenna port of the first CSI-RS resource, and so on.

[0148] In some embodiments, the antenna port layout includes lines and The UE is configured with four CSI-RS resources. Similar to the above, each antenna port of a CSI-RS resource is mapped to an antenna port or an entry in the antenna port layout (defined by row and column indices). The mapping of antenna ports of CSI-RS resources to entries in the antenna port layout also follows the interleaving scheme described below. Assume there are four distinct sets of column / column indices. , , and Each set includes A non-contiguous column / column index. As an example, the first set includes column / column indexes. The second set includes columns / column indexes. The third set includes columns / column indexes. The fourth set includes columns / column indexes. With the first set The column / column index and the first row index associated with the antenna port layout entries are associated with the antenna ports of the first CSI-RS resource. (This is in contrast to entries from the second set.) The column / column index and the first row index are associated with the antenna port layout entries for the second CSI-RS resource. This is related to the antenna ports from the third set. The column / column index and the first row index are associated with the antenna port layout entries and are linked to the antenna ports of the third CSI-RS resource. This is in conjunction with entries from the fourth set. The column / column index and the first row index associated with the antenna port layout entries are associated with the antenna ports of the fourth CSI-RS resource. (This is related to entries from the first set.) The column / column index and the second row index are associated with the antenna port layout entries and are linked to the antenna ports of the fourth CSI-RS resource. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the column / column index and the second row index are all associated with the antenna ports of the first CSI-RS resource. (This is in contrast to entries from the third set.) The entries for the antenna port layout associated with the column / column index and the second row index are all associated with the antenna ports of the second CSI-RS resource. (This is in contrast to entries from the fourth set.) The entries for the antenna port layout associated with the column / column index and the second row index are associated with the antenna ports of the third CSI-RS resource. (This is related to the first set.) The entries for antenna port layouts associated with the column / column index and the third row index are all associated with the antenna ports of the third CSI-RS resource. (This is in contrast to entries from the second set.) The entries for antenna port layouts associated with the column / column index and the third row index are all associated with the antenna ports of the fourth CSI-RS resource. (This is related to entries from the third set.) The entries for antenna port layouts associated with the column / column index and the third row index are associated with the antenna ports of the first CSI-RS resource. (This is in contrast to entries from the fourth set.) The entries for the antenna port layout associated with the column / column index and the third row index are associated with the antenna ports of the second CSI-RS resource. (This is in contrast to entries from the first set.) The second set The third set and the fourth set The entries associated with the column / column index and the fourth row index of the antenna port layout are respectively associated with the antenna ports of the second, third, fourth and first CSI-RS resources, and so on.

[0149] In some embodiments, the CSI-RS or antenna ports of a CSI-RS resource are segmented into multiple subsets of CSI-RS ports, wherein each subset includes one or more non-overlapping CSI-RS or antenna ports. The number of CSI-RS or antenna ports in each subset may be the same or different. The sum of the number of CSI-RS or antenna ports on all subsets of CSI-RS associated with a CSI-RS resource equals the total number of CSI-RS ports associated with that CSI-RS resource. In some options, a CSI-RS resource is associated with two subsets of CSI-RS ports.

[0150] In some embodiments, the antenna ports or CSI-RS ports of a first subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the even-numbered rows or row indices and all or a subset of the even-numbered columns or column indices of the antenna port layout; and the antenna ports or CSI-RS ports of a second subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the odd-numbered rows or row indices and all or a subset of the odd-numbered columns or column indices of the antenna port layout.

[0151] In some embodiments, the antenna ports or CSI-RS ports of a first subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the odd-numbered rows or row indices and all or a subset of the even-numbered columns or column indices of the antenna port layout; and the antenna ports or CSI-RS ports of a second subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the even-numbered rows / row indices and all or a subset of the odd-numbered columns / column indices of the antenna port layout.

[0152] In some examples, row indexing is used in relation to the antenna port layout. and column indexes (And the first polarization) associated CSI-RS resource antenna port or CSI-RS port with the precoded vector's first polarization The entry is associated with the antenna port or CSI-RS port associated with the second polarization and the first entry of the precoded vector. Each entry is associated with another.

[0153] In some examples, for With M=2, each CSI-RS resource includes 32 CSI-RS or antenna ports. For the first CSI-RS resource, the CSI-RS or antenna ports of the first subset of CSI-RS ports are associated with rows {0,2} and columns {0,2,4,6} of the antenna port layout, and the CSI-RS or antenna ports of the second subset of CSI-RS ports are associated with rows {1,3} and columns {1,3,5,7} of the antenna port layout. This means that the CSI-RS or antenna ports of the first CSI-RS port subset are associated with the precoding vector entries {0,2,8,10,16,18,24,26,32,34,40,42,48,50,56,58}, and the CSI-RS or antenna ports of the second CSI-RS port subset are associated with the precoding vector entries {5,7,13,15,21,23,29,31,37,39,45,47,53,55,61,63}. For the second CSI-RS resource, the CSI-RS or antenna ports of the first CSI-RS port subset are associated with the antenna port layout rows {1,3} and columns {0,2,4,6}, and the CSI-RS or antenna ports of the second CSI-RS port subset are associated with the antenna port layout rows {0,2} and columns {1,3,5,7}. This means that the CSI-RS or antenna ports of the first CSI-RS port subset are associated with the precoding vector entries {1,3,9,11,17,19,25,27,33,35,41,43,49,51,57,59}, and the CSI-RS or antenna ports of the second CSI-RS port subset are associated with the precoding vector entries {4,6,12,14,20,22,28,30,36,38,44,46,52,54,60,62}. Figure 15 This shows the mapping of CSI-RS or antenna ports for two subsets of CSI-RS ports for each CSI-RS resource. The antenna port layout includes... column sum The system includes two CSI-RS resources, each comprising a subset of two CSI-RS ports.

[0154] In some examples, for With M=4, each CSI-RS resource comprises 16 CSI-RS or antenna ports. Two of the four CSI-RS resources include antenna ports of the first polarization, and the remaining two CSI-RS resources include antenna ports of the second polarization. For the first CSI-RS resource, the CSI-RS or antenna ports of the first subset of CSI-RS ports are associated with rows {0,2} and columns {0,2,4,6} of the antenna port layout, and the CSI-RS or antenna ports of the second subset of CSI-RS ports are associated with rows {1,3} and columns {1,3,5,7} of the antenna port layout. This means that the CSI-RS or antenna ports of the first subset of CSI-RS ports are associated with entries {0,2,8,10,16,18,24,26,32} of the precoding vector, and the CSI-RS or antenna ports of the second subset of CSI-RS ports are associated with entries {5,7,13,15,21,23,29,31} of the precoding vector. For the second CSI-RS resource, the CSI-RS or antenna ports of the first CSI-RS port subset are associated with rows {1,3} and columns {0,2,4,6} of the antenna port layout, and the CSI-RS or antenna ports of the second CSI-RS port subset are associated with rows {0,2} and columns {1,3,5,7} of the antenna port layout. This means that the CSI-RS or antenna ports of the first CSI-RS port subset are associated with entries {1,3,9,11,17,19,25,27} of the precoding vector, and the CSI-RS or antenna ports of the second CSI-RS port subset are associated with entries {4,6,12,14,20,22,28,30} of the precoding vector. For the third CSI-RS resource, the CSI-RS or antenna ports of the first CSI-RS port subset are associated with rows {0,2} and columns {0,2,4,6} of the antenna port layout, and the CSI-RS or antenna ports of the second CSI-RS port subset are associated with rows {1,3} and columns {1,3,5,7} of the antenna port layout. This means that the CSI-RS or antenna ports of the first CSI-RS port subset are associated with entries {34,40,42,48,50,56,58} of the precoding vector, and the CSI-RS or antenna ports of the second CSI-RS port subset are associated with entries {37,39,45,47,53,55,61,63} of the precoding vector. For the fourth CSI-RS resource, the CSI-RS or antenna ports of the first CSI-RS port subset are associated with rows {1,3} and columns {0,2,4,6} of the antenna port layout, and the CSI-RS or antenna ports of the second CSI-RS port subset are associated with rows {0,2} and columns {1,3,5,7} of the antenna port layout.This means that the CSI-RS or antenna ports of the first CSI-RS port subset are associated with the precoding vector entries {33,35,41,43,49,51,57,59}, and the CSI-RS or antenna ports of the second CSI-RS port subset are associated with the precoding vector entries {36,38,44,46,52,54,60,62}.

[0155] Offset value indication The precoding vector entries (indexes) of the antenna ports or CSI-RS ports corresponding to the first CSI-RS port subset of the first CSI-RS resource are offset by "1" compared to the precoding vector entries (indexes) of the antenna ports or CSI-RS ports corresponding to the first CSI-RS port subset of the second CSI-RS resource. Furthermore, the precoding vector entries (indexes) of the antenna ports or CSI-RS ports corresponding to the second CSI-RS port subset of the first CSI-RS resource are offset by "-1" compared to the precoding vector entries (indexes) of the antenna ports or CSI-RS ports corresponding to the second CSI-RS port subset of the second CSI-RS resource.

[0156] This means that the row / row index of the antenna port layout associated with the antenna port of the first CSI-RS port subset of the second CSI-RS resource is obtained by adding an offset of "+1" to the row / row index of the antenna port layout corresponding to the antenna port of the first CSI-RS port subset of the first CSI-RS resource. Similarly, the row / row index of the antenna port layout associated with the antenna port of the second CSI-RS port subset of the second CSI-RS resource is obtained by adding an offset of "-1" to the row / row index of the antenna port layout corresponding to the antenna port of the second CSI-RS port subset of the first CSI-RS resource.

[0157] In some embodiments, the indication of the antenna port of a single CSI-RS resource, or the row and column indexes of the antenna port to antenna port layout of M CSI-RS resources, or the mapping or association to precoded vector entries, includes an indication of one or more offsets associated with one or more of the M CSI-RS resources.

[0158] CSI-RS resource sorting based on CSI-RS resource ID / scrambling ID The UE is configured with M CSI-RS resources in a CSI-RS resource set. Each CSI-RS resource in the CSI-RS resource set is associated with a resource ID and a scrambling ID. When estimating the channel on a CSI-RS resource, the UE needs to perform blind decoding in a search space including the M CSI-RS resource IDs or scrambling IDs, where the UE compares each CSI-RS resource with every resource in the CSI-RS resource set. This approach is obviously computationally complex and can be mitigated by transmitting the CSI-RS resources in the CSI-RS resource set in a specific order. By doing so, the UE knows the order of the CSI-RS resource IDs or scrambling IDs and can perform channel estimation without blind decoding, which greatly reduces the complexity of channel estimation at the UE.

[0159] In some embodiments, the M CSI-RS resources in the CSI-RS resource set configured for the UE are received in the same order as the CSI-RS resource IDs or scrambling IDs configured for the UE (e.g., configured via CSI report). In some examples, the M CSI-RS resources in the CSI-RS resource set configured for the UE are received in ascending or descending order of the CSI-RS resource IDs or scrambling IDs.

[0160] CSI-RS resource ranking In some embodiments, CSI-RS resources are numbered in ascending column-to-row order. In one example, for R=2, C=4, , The first CSI-RS resource is associated with row {0,1} and column {0,1,2,3}, the second CSI-RS resource is associated with row {0,1} and column {4,5,6,7}, the third CSI-RS resource is associated with row {2,3} and column {0,1,2,3}, and the fourth CSI-RS resource is associated with row {2,3} and column {4,5,6,7}.

[0161] In some embodiments, CSI-RS resources are numbered in ascending row-first, column-last order. In one example, for R=2, C=4, , The first CSI-RS resource is associated with row {0,1} and column {0,1,2,3}, the second CSI-RS resource is associated with row {2,3} and column {0,1,2,3}, the third CSI-RS resource is associated with row {0,1} and column {4,5,6,7}, and the fourth CSI-RS resource is associated with row {2,3} and column {4,5,6,7}.

[0162] Indication of the row / column index association for the antenna port-to-antenna port layout of CSI-RS resources. In some embodiments, the UE is configured to receive an indication of the mapping or association of row and column indices of antenna ports of CSI-RS resources or antenna port-to-antenna port layouts of M CSI-RS resources with entries in the precoding vector. In some examples, this indication is provided by a network node via higher-layer signaling. Through this mapping indication, the UE can perform the association of row and column indices of antenna port-to-antenna port layouts of CSI-RS resources with entries in the precoding vector.

[0163] In some embodiments, one or more bitmaps provide a mapping or association of antenna ports of CSI-RS resources, or row and column indices of antenna ports to antenna port layouts of M CSI-RS resources, or entries to precoding vectors. In some examples, a length of [length missing] is configured for the UE for the M CSI-RS resources. A bitmap, wherein for each CSI-RS resource, the bitmap contains The bit is associated with the antenna port of that CSI-RS resource. In some examples, the front... The bit is associated with the first CSI-RS resource (m=0), and finally Bit and the last CSI-RS resource ( (related to)

[0164] In some examples, the length is In the bitmap Position and antenna port layout Columns are related. Position and antenna port layout The rows are related. The first bit sequence The "1" in the position indicates the first position of the antenna port layout. List, The first bit sequence The "1" in the position indicates the first position of the antenna port layout. OK.

[0165] In some examples, the The position includes C "1"s and The "0" in the text The number of bits includes R "1"s and The zeros are C and R, where C and R represent the number of columns and rows of the CSI-RS port of the CSI-RS resource and its associated antenna port layout, respectively.

[0166] In some options, the bitmap and Each CSI-RS resource is associated with one of them. And the remaining The mapping or association of antenna ports of each CSI-RS resource is determined by the UE based on the aforementioned... The mapping or association of antenna ports for each CSI-RS resource is used to determine this. In one example, In another example, .

[0167] In some embodiments, one or more offset values ​​are configured for the UE, wherein the one or more offset values ​​are used to determine The mapping or association of antenna port to antenna port layout entries for each CSI-RS resource. Here, It is the number of CSI-RS resources that are mapped or associated with the UE or known to the UE (e.g., the mapping is fixed in the NR specification).

[0168] In some examples, the number of offset values ​​is In some other examples, the number of offset values ​​is less than... .

[0169] In some embodiments, the mapping or association of antenna ports or CSI-RS port-to-antenna port layout entries or precoding vector entries of a CSI-RS resource is obtained by superimposing offset values ​​onto the antenna port layout entries or precoding vector entries associated with the antenna ports or CSI-RS ports of the reference CSI-RS resource. In some examples, the reference CSI-RS resource is a CSI-RS resource with index m=0 or a first CSI-RS resource.

[0170] In some examples, each offset value is associated with an index, and the UE can be configured with M, or One or fewer offset indices.

[0171] In some examples, the UE is configured with One or An offset value or index. In some examples, the UE is configured with... One or An offset value or index. Here, It is the number of CSI-RS resources that are mapped or associated with the UE or configured for the UE.

[0172] In some examples, the offset value is fixed in the NR specification and is therefore known to the UE.

[0173] In some embodiments, the offset value depends on the mapping or association between the antenna port of the reference CSI-RS resource or the entry of the CSI-RS port to the antenna port layout or the entry of the precoded vector. In some examples, the antenna port of each CSI-RS resource or CSI-RS port is associated with R consecutive rows and all columns of the antenna port layout. Reference CSI-RS resource (index) The p-th antenna port or CSI-RS port of the precoding vector is related to the p-th antenna port or the CSI-RS port of the precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping from each antenna port or CSI-RS port to an entry in the precoding vector is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0174] In some examples, the antenna port or CSI-RS port of each CSI-RS resource is associated with all rows and C consecutive columns of the antenna port layout. The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is associated with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping from each antenna port or CSI-RS port to an entry in the precoding vector is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0175] In some examples, each CSI-RS resource's antenna port or CSI-RS port is associated with R consecutive rows and C consecutive columns of an antenna port layout, where and The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is compared with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( The mapping of each associated 2RC antenna ports or CSI-RS port in the precoding vector to an entry is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0176] In some examples, the antenna port or CSI-RS port of each CSI-RS resource is associated with R non-contiguous rows and all columns of the antenna port layout. The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is associated with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping of an antenna port or CSI-RS port to an entry in the precoding vector is obtained by adding an offset value m to an entry in the precoding vector associated with a reference CSI-RS resource.

[0177] In some examples, the antenna port or CSI-RS port of each CSI-RS resource is associated with all rows of C non-contiguous columns and the antenna port layout. The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is associated with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping from each antenna port or CSI-RS port to an entry in the precoding vector is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0178] In some examples, each CSI-RS resource's antenna or CSI-RS port is associated with R consecutive rows and C non-consecutive columns of an antenna port layout, where, and The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is compared with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping from each antenna port or CSI-RS port to an entry in the precoding vector is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0179] In some examples, each CSI-RS resource's antenna port or CSI-RS port is associated with R non-contiguous rows and C consecutive columns of an antenna port layout, where and The p-th antenna or CSI-RS port of the referenced CSI-RS resource (index m=0) is related to the precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( The mapping of each associated 2RC antenna ports or CSI-RS port in the precoding vector to an entry is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0180] In some examples, each CSI-RS resource's antenna port or CSI-RS port is associated with R non-contiguous rows and C non-contiguous columns of the antenna port layout, where and The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is compared with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( The mapping of each associated 2RC antenna ports or CSI-RS port in the precoding vector to an entry is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0181] In some examples, the antenna port or CSI-RS port of each CSI-RS resource is associated with R consecutive rows and all columns of the antenna port layout. The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is associated with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping from each antenna port or CSI-RS port to an entry in the precoding vector is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0182] In some examples, the antenna port or CSI-RS port of each CSI-RS resource is associated with all rows and C consecutive columns of the antenna port layout. The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is associated with the p-th entry of the precoding vector. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping from each antenna port or CSI-RS port to an entry in the precoding vector is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0183] In some examples, each CSI-RS resource's antenna port or CSI-RS port is associated with R consecutive rows and C consecutive columns of an antenna port layout, where and The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is compared with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping from each antenna port or CSI-RS port to an entry in the precoding vector is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0184] In some examples, each CSI-RS resource's antenna port or CSI-RS port is associated with R non-contiguous rows and all columns of the antenna port layout, where The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is compared with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping from each antenna port or CSI-RS port to an entry in the precoding vector is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0185] In some examples, the antenna port or CSI-RS port of each CSI-RS resource is associated with all rows and C non-contiguous columns of the antenna port layout, where The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is compared with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( Each of the associated ones in ) The mapping from each antenna port or CSI-RS port to an entry in the precoding vector is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0186] In some examples, each CSI-RS resource's antenna port or CSI-RS port is associated with R consecutive rows and C non-consecutive columns of the antenna port layout, where and The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is compared with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( The mapping of each associated RC antenna port or CSI-RS port in the precoding vector to an entry is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0187] In some examples, each CSI-RS resource's antenna port or CSI-RS port is associated with R non-contiguous rows and C consecutive columns of an antenna port layout, where and The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is compared with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( The mapping of each associated RC antenna port or CSI-RS port in the precoding vector to an entry is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0188] In some examples, each CSI-RS resource's antenna port or CSI-RS port is associated with R non-contiguous rows and C non-contiguous columns of the antenna port layout, where and The p-th antenna port or CSI-RS port of the referenced CSI-RS resource (index m=0) is compared with the p-th precoding vector. Each entry is related. With the remaining M-1 CSI-RS resources ( The mapping of each associated RC antenna port or CSI-RS port in the precoding vector to an entry is achieved by using offset values. It is obtained by adding entries to the precoded vectors associated with the reference CSI-RS resource.

[0189] In some embodiments, the mapping or association of antenna ports of a CSI-RS resource or rows and columns of CSI-RS ports to antenna port layouts is obtained by adding offset values ​​to the rows and columns of the antenna port layout associated with the reference CSI-RS resource. In some examples, the reference CSI-RS resource is the CSI-RS resource with index m=0 or the first CSI-RS resource.

[0190] In some examples, the antenna port or CSI-RS port of each CSI-RS resource is associated with all columns of the R row and antenna port layout. Refer to CSI-RS resources and rows. Associated with all columns. Then, the CSI-RS resources of index m are linked with the rows. Associated, where the row associated with the CSI-RS resource of index m is determined by the offset value. Obtained by adding to the row / row index associated with the reference CSI-RS resource.

[0191] In some examples, the antenna port or CSI-RS port of each CSI-RS resource is associated with all rows and column C. See CSI-RS Resources and Columns for reference. Associated with all rows. Then, the CSI-RS resources of index m are linked with the columns. Associated, where the column associated with the CSI-RS resource of index m is determined by the offset value. Obtained by adding to the column / column index associated with the reference CSI-RS resource.

[0192] In some examples, the antenna or CSI-RS port of each CSI-RS resource is associated with row R and column C of the antenna port layout. (Refer to CSI-RS resources and rows.) and column Associated. Then, the CSI-RS resource of index m is associated with the row. and column Associated, where the row associated with the CSI-RS resource of index m is determined by the offset value. The column associated with the CSI-RS resource at index m, obtained by adding a row / row index to the reference CSI-RS resource, is the offset value. Obtained by adding to the column / column index associated with the reference CSI-RS resource.

[0193] In some embodiments, offset values ​​associated with a first dimension (or column) and / or a second dimension (or row) of the antenna port layout are configured to the UE, or fixed in the NR specification, or determined by the UE based on the rows and columns corresponding to the antenna port layout of the reference CSI-RS resource.

[0194] In some embodiments, the UE is configured with multiple mappings or associations for antenna ports of CSI-RS resources, or row and column indices of antenna ports to antenna port layouts of M CSI-RS resources, or entries to precoded vectors. Each mapping provides an association for antenna ports of CSI-RS resources or row and column indices or entries of CSI-RS port to antenna port layouts, and / or entries to precoded vectors for CSI reporting. In some examples, multiple mappings or associations are configured by a network node (e.g., gNB). The gNB can provide a higher-level indication for one of the configured mappings or associations to use by the UE, for example, for calculating precoded vectors used in CSI reporting. This indication can be provided from the network node via higher-level signaling (e.g., RRC). In another example, the indication is provided by the network node via physical layer signaling (e.g., downlink control channel DCI). In some examples, the indication via higher-level or DCI is provided in the form of a bitmap, where each bit in the bitmap is associated with a specific mapping or association. For example, when the UE is configured with N different mappings or associations, the bitmap may include N bits.

[0195] In some embodiments, the UE is configured to report CSI or CSI reports via PUSCH or PUCCH corresponding to M configured CSI-RS resources or a resource set configured with M CSI-RS resources, wherein at least one of the following applies: This CSI report does not include CSI-RS resource indicators; The CSI report is transmitted in two parts, with the first part including at least the rank indicator / index and the channel quality indicator / index; The CSI report is transmitted after all M CSI-RS resources have been received, following the triggering of M resources or resource sets (e.g., when the CSI-RS resources are non-periodic). The CSI report is transmitted after the start of the CSI-RS cycle, following the receipt of all M CSI-RS resources (this can be applied to cases where the CSI-RS resources are periodic or semi-persistent).

[0196] In some embodiments, the wireless device is configured with multiple subbands. Each subband is associated with or comprises multiple consecutive physical resource blocks (PRBs).

[0197] In some embodiments, the number of subband sets is either fixed in the NR specification, configured by the radio device (e.g., the UE), determined by the radio device based on one or more parameters configured for the radio device, or determined by the radio device based on one or more fixed parameters in the NR specification. In some examples, the number of subband sets depends on the amount of CSI-RS resources.

[0198] In some embodiments, the mapping of antenna ports or CSI-RS port-to-antenna port layout entries for CSI-RS resources is subband-related.

[0199] CSI-RS resources include multiple antenna ports or CSI-RS ports, each of which is mapped to an entry in an antenna port layout. Each antenna or CSI-RS port of a CSI-RS resource can be associated with a configured number of subbands N. This means that for a first subband set, one or more antenna ports or CSI-RS ports of the CSI-RS resource are mapped to entries in the antenna port layout using a first mapping scheme, and for a second subband set, the same antenna ports or CSI-RS ports of the CSI-RS resource are mapped to entries in the antenna port layout using a second mapping scheme. Note that the first and second subband sets can include different subbands. For example, when a wireless device is configured with N subbands, the first subband set can include subbands... The second subset may include sub-bands In another example, the first subset may include sub-bands. The second subset may include sub-bands The first and / or second mapping schemes described above can be one of the mapping schemes described in the above embodiments. For example, the first and second mapping schemes can be interleaving schemes. In some examples, the first and second mapping schemes are the same. In some examples, the first and second mapping schemes are different.

[0200] By using such mapping, the aperture size of CSI-RS transmission can be increased or enhanced. The sub-band specific mapping scheme described above allows CSI-RS transmission using a single CSI-RS resource, mapping an antenna port or CSI-RS port to an entry in the antenna port layout that covers the full aperture size (all elements of the antenna port layout). The wireless device can estimate the channel based on the measured antenna port or CSI-RS port and interpolate the measurements in the spatial domain (relative to the antenna port or CSI-RS port) and the frequency domain (relative to the sub-band) to obtain a set of channel estimates for the antenna ports or CSI-RS ports for all configured sub-bands and CSI-RS resources.

[0201] In some examples, it is assumed that there are two distinct sets of row / row indexes. and Each set includes A non-contiguous row / row index. As an example, the first set includes row / row indices. The second set includes row / row indexes. With the first set The entries for the antenna port layout associated with the row / row index and the first column index are all associated with the antenna ports of the first subset. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the row / row index and the first column index are all associated with the antenna ports of the second subset. (This is in contrast to entries from the first set.) The entries associated with the row / row index and the second column index are all associated with the antenna ports of the second subset. The entries associated with the row / row index and the second column index are all associated with the antenna ports of the first subband set, and so on.

[0202] In some examples, it is assumed that there are two distinct sets of columns / column indexes. and Each set includes A non-contiguous column / column index. As an example, the first set includes column / column indexes. The second set includes columns / column indexes. With the first set The entries for the antenna port layout associated with the column / column index and the first row index are all associated with the antenna ports of the first subset. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the column / column index and the first row index are all associated with the antenna ports of the second subset. (This is in contrast to entries from the first set.) The entries for the antenna port layout associated with the column / column index and the second row index are all associated with the antenna ports of the second subset. The entries for the antenna port layout associated with the column / column index and the second row index are all associated with the antenna ports of the first subband set, and so on.

[0203] In some examples, there are four subband sets and four CSI-RS resources. This means that, for the first subband set, one or more antenna ports of the CSI-RS resource are mapped to entries in the antenna port layout using a first mapping scheme; for the second subband set, the same antenna ports of the CSI-RS resource are mapped to entries in the antenna port layout using a second mapping scheme; for the third subband set, the same antenna ports of the CSI-RS resource are mapped to entries in the antenna port layout using a third mapping scheme; and for the fourth subband set, the same antenna ports of the CSI-RS resource are mapped to entries in the antenna port layout using a fourth mapping scheme. For example, when the wireless device is configured with N subbands, the first subband set may include subbands. The second subset may include sub-bands The third subset may include sub-bands The fourth subset may include sub-bands For example, when a wireless device is configured with N subbands, the first set of subbands may include subbands. The second subset may include sub-bands The third subset may include sub-bands The fourth subset may include sub-bands The first and / or, second and / or, third and / or, and fourth mapping schemes described above can be one of the mapping schemes described in the above embodiments. For example, the first, second, third, and fourth mapping schemes can be interleaving schemes. In some examples, the first, second, third, and fourth mapping schemes are the same. In some examples, the first, second, third, and fourth mapping schemes are different.

[0204] In some examples, it is assumed that there are four distinct sets of row / row indexes. , , and Each set includes A non-contiguous row / row index. As an example, the first set includes row / row indices. The second set includes row / row indexes. The third set includes row / row indexes. The fourth set includes row / row indexes. With the first set The entries for the antenna port layout associated with the row / row index and the first column index are all associated with the antenna ports of the first subset. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the row / row index and the first column index are all associated with the antenna ports of the second subset. (And with those from the third set...) The entries for the antenna port layout associated with the row / row index and the first column index are all associated with the antenna ports of the third subset. (This is in contrast to entries from the fourth set.) The entries for the antenna port layout associated with the row / row index and the first column index are all associated with the antenna ports of the fourth subset. (This is in contrast to entries from the first set.) The entries for the antenna port layout associated with the row / row index and the second column index are all associated with the antenna ports of the fourth subset. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the row / row index and the second column index are all associated with the antenna ports of the first subset. (And with those from the third set...) The entries for the antenna port layout associated with the row / row index and the second column index are all associated with the antenna ports of the second subset. (This is in contrast to entries from the fourth set.) The entries for the antenna port layout associated with the row / row index and the second column index are associated with the antenna ports of the third subset. (This is in contrast to entries from the first set.) The entries for the antenna port layout associated with the row / row index and the third column index are associated with the antenna ports of the third subset. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the row / row index and the third column index are associated with the antenna ports of the fourth subset. (This is related to entries from the third set.) The entries for antenna port layouts associated with the row / row index and the third column index are all associated with antenna ports in the first subset. (This is in contrast to entries from the fourth set.) The entries for antenna port layouts associated with the row / row index and the third column index are all associated with antenna ports in the second subset. This is in contrast to entries from the first, second, third, and fourth sets. , , and The entries associated with the row / row index and the fourth column / column index of the antenna port layout are respectively associated with the antenna ports of the second, third, fourth and first subband sets, and so on.

[0205] In some examples, it is assumed that there are four distinct sets of columns / column indexes. , , and Each set includes A non-contiguous column / column index. As an example, the first set includes column / column indexes. The second set includes columns / column indexes. The third set includes columns / column indexes. The fourth set includes columns / column indexes. With the first set The entries for the antenna port layout associated with the column / column index and the first row index are associated with the antenna ports of the first subset. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the column / column index and the first row index are associated with the antenna ports of the second subset. (This is in contrast to entries from the third set.) The entries for the antenna port layout associated with the column / column index and the first row index are associated with the antenna ports of the third subset. (This is in contrast to entries from the fourth set.) The entries for the antenna port layout associated with the column / column index and the first row index are associated with the antenna ports of the fourth subset. (This is in contrast to entries from the first set.) The entries for the antenna port layout associated with the column / column index and the second row index are associated with the antenna ports of the fourth subset. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the column / column index and the second row index are associated with the antenna ports of the first subset. (This is in contrast to entries from the third set.) The entries for the antenna port layout associated with the column / column index and the second row index are associated with the antenna ports of the second subset. (This is in contrast to entries from the fourth set.) The entries for the antenna port layout associated with the column / column index and the second row index are associated with the antenna ports of the third subset. (This is in contrast to entries from the first set.) The entries for the antenna port layout associated with the column / column index and the third row index are associated with the antenna ports of the third subset. (This is in contrast to entries from the second set.) The entries for the antenna port layout associated with the column / column index and the third row index are associated with the antenna ports of the fourth subset. (This is related to entries from the third set.) The entries for the antenna port layout associated with the column / column index and the third row index are associated with the antenna ports of the first subset. (This is in contrast to entries from the fourth set.) The entries for the antenna port layout associated with the column / column index and the third row index are associated with the antenna ports of the second subset. This is in contrast to entries from the first, second, third, and fourth sets. , , and The column / column index and the fourth row index of the antenna port layout are associated with the antenna ports of the second, third, fourth and first subband sets, respectively, and so on.

[0206] In some examples, the number of subband sets is not equal to the number of CSI-RS resources.

[0207] refer to Figure 3 This illustrates a method performed by a wireless device according to some previously described embodiments. The method includes: Received from network node (401A): Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as Configuration or indication, wherein the configuration or indication represents M A Channel State Information Reference Signal (CSI-RS) resource, wherein each CSI-RS resource includes multiple antenna ports or CSI-RS ports, wherein the antenna ports or CSI-RS ports of each CSI-RS resource are mapped to a subset or proper subset of the row index and column index of the antenna port layout; For each CSI-RS resource, determine (402A) entries of precoding vectors associated with a subset or proper subset of the rows and columns of the antenna port layout; Generate (403A) a CSI report or CSI feedback report containing a precoding matrix indicator (PMI), the PMI indicating the precoding vector; and Transmit (404A) or report the CSI report or the CSI feedback report to the network node.

[0208] In some examples, there is a single configuration or indication that provides the UE with the number of antenna port layouts. and quantity And M CSI-RS resources. In one example, the number of antenna port layouts and quantity And M CSI-RS resources are configured to the UE via a higher layer (e.g., RRC). In another example, the number of antenna port layouts... and quantity And M CSI-RS resources are indicated to the UE via the downlink control channel indicator (DCI).

[0209] According to some embodiments of this application, a method performed by a wireless device (e.g., a user equipment UE) is provided, the method comprising: Received from network node: Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as The configuration or indication represents at least one Channel State Information Reference Signal (CSI-RS) resource and the number of subbands, wherein the CSI-RS resource includes multiple antenna ports or CSI-RS ports, and each antenna port or CSI-RS port is associated with the number of subbands, wherein, for a first set of subbands, an antenna port or CSI-RS port is mapped to a first entry of the antenna port layout using a first mapping scheme; and for a second set of subbands, the antenna port or CSI-RS port is mapped to a second entry of the antenna port layout using a second mapping scheme; Determine the entries of the precoded vector associated with the antenna port; Generate a CSI report or CSI feedback report containing a precoding matrix indicator (PMI), wherein the PMI indicates the precoding vector; and The CSI report or the CSI feedback report is reported to the network node.

[0210] According to some embodiments of this application, the first subband set and the second subband set include different subbands. For example, when the wireless device is configured with N subbands, the first subband set may include subbands. The second subset may include sub-bands In another example, the first subset may include sub-bands. The second subset may include sub-bands The first and second subbands can be non-empty sets.

[0211] According to some embodiments of this application, the first, second, third, and fourth subband sets include different subbands. For example, when a wireless device is configured with N subbands, the first subband set may include subbands. The second subset may include sub-bands The third subset may include sub-bands The fourth subset may include sub-bands For example, when a wireless device is configured with N subbands, the first set of subbands may include subbands. The second subset may include sub-bands The third subset may include sub-bands The fourth subset may include sub-bands .

[0212] According to some embodiments of this application, the first and / or second mapping scheme can be one of the mapping schemes described in the above embodiments. For example, the first and second mapping schemes can be interleaving schemes. Note that, generally, according to some embodiments herein, the first mapping scheme differs from the second mapping scheme. This means that the first mapping maps the antenna port of the CSI-RS resource to a first set of entries or antenna ports in the antenna port layout, and the second mapping maps the antenna port of the CSI-RS resource to a second set of entries or antenna ports in the antenna port layout, wherein the first set of entries or antenna ports in the antenna port layout is different from the second set of entries or antenna ports in the antenna port layout. It should be noted that the first set of entries may include entries different from the second set of entries.

[0213] According to some embodiments of this application, for a first subband set, an antenna port or CSI-RS port is mapped to a first entry of an antenna port layout using a first mapping scheme, and for a second subband set, it is mapped to a second entry of an antenna port layout using a second mapping scheme, wherein the first entry of the antenna port layout is different from the second entry of the antenna port layout.

[0214] According to some embodiments of this application, a wireless device is configured to receive a given CSI-RS resource on a set of symbols that do not overlap or intersect with a set of symbols receiving any other M CSI-RS resources.

[0215] According to some embodiments of this application, a wireless device is configured with P antenna ports or CSI-RS ports, and each CSI-RS resource is associated with the same P antenna ports or CSI-RS ports, or with a subset or proper subset of the P antenna ports or CSI-RS ports.

[0216] According to some embodiments of this application, each CSI-RS resource's antenna port or CSI-RS port is associated with multiple consecutive rows R and all columns of the antenna port layout, wherein, .

[0217] According to some embodiments of this application, the p-th antenna port or CSI-RS port of the CSI-RS resource is related to the p-th precoding vector. The entries are related, among which It is a CSI-RS resource index. It is the CSI-RS port index associated with CSI-RS resources.

[0218] According to some embodiments of this application, each CSI-RS resource's antenna port or CSI-RS port is associated with multiple consecutive columns C and all rows of the antenna port layout, wherein, .

[0219] According to some embodiments of this application, the p-th antenna port or CSI-RS port of the CSI-RS resource is related to the p-th precoding vector. The entries are related, among which It is a CSI-RS resource index. It is an antenna port or CSI-RS port index associated with a CSI-RS resource.

[0220] According to some embodiments of this application, the antenna port or CSI-RS port of each CSI-RS resource is associated with multiple consecutive or non-consecutive rows R and multiple consecutive or non-consecutive columns C of the antenna port layout, wherein and .

[0221] According to some embodiments of this application, the antenna port or CSI-RS port of each CSI-RS resource is associated with multiple consecutive or non-consecutive rows R and multiple consecutive columns C of the antenna port layout, wherein and .

[0222] According to some embodiments of this application, the p-th antenna port or CSI-RS port of the CSI-RS resource is related to the p-th precoding vector. The entries are related, among which CSI-RS Resource Index It is an antenna port or CSI-RS port index associated with a CSI-RS resource.

[0223] According to some embodiments of this application, the p-th antenna port or CSI-RS port of the CSI-RS resource is related to the p-th precoding vector. The entries are related, among which It is a CSI-RS resource index. It is an antenna port or CSI-RS port index associated with a CSI-RS resource.

[0224] According to some embodiments of this application, the value of R or the value of C is determined by the wireless device based on one or more configured parameters, or configured to the wireless device via higher-level signaling, or fixed in the NR specification and known to the wireless device.

[0225] According to some embodiments of this application, each CSI-RS resource is associated with a CSI-RS resource index, and the M CSI-RS resources are mapped to the CSI-RS resource index through a mapping or permutation function.

[0226] According to some embodiments of this application, the method includes: receiving an indication of a mapping or association of an antenna port or a row and column index of a CSI-RS resource to an antenna port layout, or to an entry of a precoded vector.

[0227] According to some embodiments of this application, the CSI-RS or antenna ports of the CSI-RS resource are segmented into multiple subsets of CSI-RS ports, wherein the subsets of CSI-RS ports include one or more non-overlapping CSI-RS or antenna ports.

[0228] According to some embodiments of this application, when the number of CSI-RS port subsets is two, the antenna or CSI-RS port of the first CSI-RS port subset of the CSI-RS resource is associated with all or a subset of the even-numbered row / row index and all or a subset of the even-numbered column / column index of the antenna port layout.

[0229] According to some embodiments of this application, when there are two subsets of CSI-RS ports, the antenna ports or CSI-RS ports of the first subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the odd-numbered row / row indices and all or a subset of the even-numbered column / column indices of the antenna port layout; and the antenna ports or CSI-RS ports of the second subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the even-numbered row / row indices and all or a subset of the odd-numbered column / column indices of the antenna port layout.

[0230] According to some embodiments of this application, the antenna port or CSI-RS port of the CSI-RS resource is associated with R consecutive rows and all columns of the antenna port layout, and the p-th antenna port or CSI-RS port of the CSI-RS resource is associated with the p-th precoding vector. Each entry is associated with another.

[0231] According to some embodiments of this application, the CSI-RS port of each CSI-RS resource is associated with all rows and C consecutive columns, and the p-th antenna port or CSI-RS port of the CSI-RS resource is associated with the p-th precoding vector. Each entry is associated with another.

[0232] According to some embodiments of this application, the antenna port or CSI-RS port of each CSI-RS resource is associated with R non-contiguous rows and C non-contiguous columns of the antenna port layout, and the p-th antenna port or CSI-RS port of the CSI-RS resource is associated with the p-th precoding vector. The entries are related, among which It is a CSI-RS resource index. It is an antenna port or CSI-RS port index associated with a CSI-RS resource.

[0233] A wireless device is also provided for performing the previously described procedures or method steps executed by a wireless device or a UE. Figure 12 A simplified block diagram depicting a wireless device 700 is shown. The wireless device 700 includes a processor 710 or processing circuitry or processing module or processor device 710; a receiver circuitry or receiver module 740; a transmitter circuitry or transmitter module 750; a memory module 720; and a transceiver circuitry or transceiver module 730, which may include the transmitter circuitry 750 and the receiver circuitry 740. The wireless device 700 also includes an antenna port system 760, which includes antenna circuitry for transmitting and receiving signals to / from at least a network node or other wireless device. This antenna system employs beamforming as described above.

[0234] The wireless device can be a UE or an IoT device. Wireless device 700 can belong to any radio access technology, including 4G or LTE, LTE-A, 5G, advanced 5G, or combinations thereof supporting beamforming technologies. The wireless device, including a processor and memory, contains instructions executable by the processor, thereby enabling wireless device 700 to operate or be configured to perform any embodiment associated with the previously described wireless device.

[0235] Processing module / circuit 710 includes a processor, microprocessor, application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), etc., and may be referred to as a "processor". Processor 710 controls the operation of the wireless device and its components. Memory (circuit or module) 720 includes random access memory (RAM), read-only memory (ROM), and / or another type of memory for storing data and instructions usable by processor 710. Generally, it should be understood that in one or more embodiments, wireless device 700 includes fixed or programmable circuitry configured to perform the operations of any of the embodiments disclosed herein.

[0236] In at least one such example, processor 710 includes a microprocessor, microcontroller, DSP, ASIC, FPGA, or other processing circuitry configured to execute computer program instructions from a computer program stored in a non-transitory computer-readable medium that is in or accessible to the processing circuitry. Here, "non-transitory" does not necessarily mean permanent or immutable storage and may include storage in working or volatile memory, but the term does indeed imply storage that is at least somewhat persistent. The execution of the program instructions is specifically adapted or configured to perform the operations disclosed herein in relation to the wireless device. Furthermore, it should be understood that wireless device 700 may include additional components.

[0237] The wireless device 700 executes instructions contained in the memory 720 via the processor 710, thereby enabling the wireless device to perform any of the previously described embodiments relating to actions performed by the wireless device, some of which are set forth in the appended claims.

[0238] A computer program is also provided, including instructions that, when executed by a processor 710 of a wireless device, cause the processor 710 to perform a method according to any of the previously described embodiments.

[0239] refer to Figure 4 The diagram illustrates a method performed by a network node 800 according to some previously described embodiments. The method performed by the network node 800 is for receiving a CSI report from a wireless device 700 in a wireless communication network, the CSI report indicating a precoding matrix. Figure 5 The main method steps are shown, including: Transmit (501) to wireless device (700): Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as Configuration or indication, wherein the configuration or indication represents MA Channel State Information Reference Signal (CSI-RS) resource, wherein each CSI-RS resource includes multiple antenna ports or CSI-RS ports, wherein the antenna ports or CSI-RS ports of each CSI-RS resource are mapped to a subset or proper subset of the row index and column index of the antenna port layout; So that the wireless device can: For each CSI-RS resource, determine entries of precoding vectors associated with a subset or proper subset of the rows and columns of the antenna port layout; Determine the precoding matrices for RI transport layers, wherein the precoding matrices include v There are n precoding vectors, and each precoding vector has Each entry is associated with a transport layer; Generate a CSI report or CSI feedback report for transmission to the network node, the report including a precoding matrix indicator (PMI) indicating the precoding vector or precoding matrix; and Uplink control information (UCI) including the CSI report or CSI feedback report is received (502) from the wireless device (700) via the uplink UL channel.

[0240] According to another aspect of the embodiments of this application, a method performed by a network node is provided for receiving a Channel State Information (CSI) report in a wireless communication network from a wireless device, the CSI report indicating a precoding matrix, the method comprising: Transmit to wireless devices: Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as The configuration or indication represents at least one Channel State Information Reference Signal (CSI-RS) resource and the number of subbands, wherein the CSI-RS resource includes multiple antenna ports or CSI-RS ports, and each antenna port or CSI-RS port is associated with the number of subbands, wherein, for a first set of subbands, an antenna port or CSI-RS port is mapped to a first entry of the antenna port layout using a first mapping scheme; and for a second set of subbands, the antenna port or CSI-RS port is mapped to a second entry of the antenna port layout using a second mapping scheme.

[0241] So that the wireless device can: Determine the entries of the precoding vector or precoding matrix associated with the antenna port or CSI-RS port; Generate a CSI report or CSI feedback report for transmission to the network node, the report including a precoding matrix indicator (PMI) indicating the precoding vector or precoding matrix; and Uplink control information (UCI), including the CSI report or CSI feedback report, is received from the wireless device via the uplink UL channel.

[0242] A network node is also provided to perform the previously described procedures or method steps executed by the network node. Figure 13 A block diagram depicting a network node 800 is shown. The network node 800 includes a processor 810 or processing circuitry or processing module or processor device 810; a receiver circuitry or module 840; a transmitter circuitry or transmitter module 850; a memory module 820; and a transceiver circuitry or transceiver module 830, which may include the transmitter circuitry 850 and the receiver circuitry 840. The network node 800 also includes an antenna port system 860, which includes antenna circuitry for transmitting and receiving signals to / from at least a wireless device. This antenna system employs beamforming as described above.

[0243] Network node 800 can belong to any radio access technology, including 4G or LTE, LTE-A, 5G, advanced 5G, or combinations thereof that support beamforming technologies. The network node can be a gNB. The network device, including a processor and memory, contains instructions executable by the processor, thereby enabling network node 800 to operate or be configured to perform any embodiments associated with the previously described network node 800.

[0244] Processing module / circuit 810 includes a processor, microprocessor, application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), etc., and may be referred to as a "processor". Processor 810 controls the operation of network nodes and their components. Memory (circuit or module) 820 includes random access memory (RAM), read-only memory (ROM), and / or another type of memory for storing data and instructions usable by processor 810. Generally, it should be understood that in one or more embodiments, the network node includes fixed or programmable circuitry configured to perform the operations of any of the embodiments disclosed herein. In at least one such example, processor 810 includes a microprocessor, microcontroller, DSP, ASIC, FPGA, or other processing circuitry configured to execute computer program instructions from a computer program stored in a non-transitory computer-readable medium that is in or accessible to the processing circuitry. Here, "non-transitory" does not necessarily mean permanent or immutable storage and may include storage in working or volatile memory, but the term does indeed mean storage that is at least somewhat persistent. The execution of the program instructions is specifically adapted or configured to perform the operations disclosed herein in relation to wireless devices. Furthermore, it should be understood that the wireless device 800 may include additional components. The network node 800 may also be considered as a transmit and receive point (TRP).

[0245] Network node 800 executes instructions contained in memory 820 via processor 810, thereby enabling network node 800 to perform any of the previously described embodiments relating to actions performed by the network node, some of which are set forth in appended claim 20.

[0246] A computer program is also provided, including instructions that, when executed by a processor 810 of a network node, cause the processor 810 to perform the method according to any one of claims 20.

[0247] Several advantages of the embodiments described in this disclosure, as previously mentioned, include a significant reduction in the computational complexity of CSI measurements reported by codebook-based CSI at the wireless device when a large number of antenna ports or CSI-RS ports are configured for the wireless device.

[0248] Throughout this specification, references to “example” or “exemplary” mean that a particular feature, structure, or characteristic described in connection with that example is included in at least one embodiment of the technology. Therefore, the phrase “in an example” or the word “exemplary” appearing in various places throughout this specification do not necessarily refer to the same embodiment.

[0249] Throughout this disclosure, the terms "comprising" or "including" are used in a non-limiting sense, meaning "consisting of at least...". Although specific terms may be used herein, they are used only in a general and descriptive sense and not for limiting purposes. Embodiments herein can be applied to any wireless system, including LTE or 4G, LTE-A (or LTE-Advanced), 5G, advanced 5G, WiMAX, WiFi, satellite communications, television broadcasting, etc.

Claims

1. A method performed by a wireless device (700), characterized in that, The method includes: Receive the following (401A) from network node (800): Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as Configuration or indication, wherein the configuration or indication represents M Each Channel State Information Reference Signal (CSI-RS) resource includes multiple antenna ports or CSI-RS ports, wherein the antenna ports or CSI-RS ports of each CSI-RS resource are mapped to a subset or proper subset of the row and column indices of the antenna port layout. For each CRI-RS resource, determine (402A) entries of precoding vectors associated with a subset or proper subset of the row and column indices of the antenna port layout; Generate (403A) a CSI report or CSI feedback report containing a precoding matrix indicator (PMI), the PMI indicating the precoding vector; and Report (404A) the CSI report or the CSI feedback report to the network node (800).

2. The method according to claim 1, characterized in that, The CSI-RS resource is received by a symbol set, which does not overlap or intersect with the symbol set that receives any of the M CSI-RS resources.

3. The method according to claim 1 or 2, characterized in that, The wireless device is configured with P antenna ports or CSI-RS ports, and each of the CSI-RS resources is associated with the P antenna ports or CSI-RS ports, or with a subset or proper subset of the P antenna ports or CSI-RS ports.

4. The method according to claim 1, characterized in that, The antenna port of each of the CSI-RS resources or the CSI-RS port and the layout of the antenna ports. A series of consecutive rows and all columns are associated, and in which ≥1.

5. The method according to claim 4, characterized in that, Associated with the first polarization Each CSI-RS port is mapped to the antenna port layout. lines and Columns associated with the second polarization Each CSI-RS port is mapped to the same antenna port layout. lines and List.

6. The method according to claim 4 or 5, characterized in that, and These are the number of CSI-RS resources and the number of CSI-RS ports associated with those resources.

7. The method according to claim 4, characterized in that, The antenna port of the CSI-RS resource or the layout of the CSI-RS port with the antenna port. A series of consecutive rows and all columns are associated, and the p-th antenna port or CSI-RS port of the CSI-RS resource is associated with the p-th precoding vector. The entries are related, among which For the CSI-RS resource index, p=0, …, -1 is the index of the antenna port or CSI-RS port associated with the CSI-RS resource.

8. The method according to claim 1, characterized in that, The antenna ports or CSI-RS ports of the CSI-RS resource are divided into multiple subsets of CSI-RS ports, one of which includes one or more non-overlapping CSI-RS ports or antenna ports.

9. The method according to claim 8, characterized in that, When there are two subsets of CSI-RS ports, the antenna ports or CSI-RS ports of the first subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the even-numbered rows or row indices and all or a subset of the even-numbered columns or column indices of the antenna port layout; and the antenna ports or CSI-RS ports of the second subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the odd-numbered rows or row indices and all or a subset of the odd-numbered columns or column indices of the antenna port layout.

10. The method according to claim 8, characterized in that, When there are two subsets of CSI-RS ports, the antenna ports or CSI-RS ports of the first subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the odd-numbered rows or row indices and all or a subset of the even-numbered columns or column indices of the antenna port layout; and the antenna ports or CSI-RS ports of the second subset of CSI-RS ports of the CSI-RS resource are associated with all or a subset of the even-numbered rows / row indices and all or a subset of the odd-numbered columns / column indices of the antenna port layout.

11. The method according to claim 1, characterized in that, The antenna port or CSI-RS port of each CSI-RS resource is associated with C consecutive columns and all rows of the antenna port layout, where C ≥ 1.

12. The method according to claim 11, characterized in that, Associated with the first polarization Each CSI-RS port is mapped to the antenna port layout. Rows and column C, and associated with the second polarization. Each CSI-RS port is mapped to the same antenna port layout. Row and column C.

13. The method according to claim 11 or 12, characterized in that, and These are the number of CSI-RS resources and the number of CSI-RS ports associated with a single CSI-RS resource.

14. The method according to claim 11, characterized in that, Each antenna port or CSI-RS port of the CSI-RS resource is associated with all rows and multiple consecutive columns C of the antenna port layout; and the p-th antenna port or CSI-RS port of the CSI-RS resource is associated with the p-th precoded vector. The entries are related, among which For the CSI-RS resource index, p=0, …, -1 is the index of the antenna port or CSI-RS port associated with the CSI-RS resource.

15. The method according to claim 1, characterized in that, Antenna ports for each CSI-RS resource or CSI-RS ports and their layout A series or non-continuous rows, and A series of consecutive or non-consecutive columns are associated, where... and .

16. The method according to claim 15, characterized in that, Each CSI-RS resource's antenna port or CSI-RS port is associated with R non-contiguous rows and C non-contiguous columns of the antenna port layout; and the p-th port of the CSI-RS resource is associated with the p-th port of the precoding vector. The entries are related, among which For the CSI-RS resource index, -1 is the index of the antenna port or CSI-RS port associated with the CSI-RS resource.

17. The method according to claim 4, characterized in that, The p-th antenna port of the CSI-RS resource or the CSI-RS port and the precoding vector of the p-th antenna port The entries are related, among which For the CSI-RS resource index, An index for the antenna port or CSI-RS port associated with the CSI-RS resource.

18. The method according to claim 11, characterized in that, The p-th antenna port of the CSI-RS resource or the CSI-RS port and the precoded vector of the p-th antenna port The entries are related, among which For the CSI-RS resource index, An index for the antenna port or CSI-RS port associated with the CSI-RS resource.

19. The method according to claim 15, characterized in that, The p-th antenna port of the CSI-RS resource or the CSI-RS port and the precoding vector of the p-th antenna port Each entry is associated with another, among which, For the CSI-RS resource index, An index for the antenna port or CSI-RS port associated with the CSI-RS resource.

20. The method according to claim 15, characterized in that, The p-th antenna port of the CSI-RS resource or the CSI-RS port and the precoding vector of the p-th antenna port Each entry is associated with another, among which, For the CSI-RS resource index, An index for the antenna port or CSI-RS port associated with the CSI-RS resource.

21. The method according to any of the preceding claims, characterized in that, The value of R or the value of C is determined by the wireless device according to one or more configuration parameters, or configured to the wireless device via higher-layer signaling, or is fixed in the New Radio (NR) specification and known to the wireless device.

22. The method according to the preceding claim, characterized in that, Each of the CSI-RS resources is associated with a CSI-RS resource index, and the M CSI-RS resources are mapped to the CSI-RS resource index through a mapping or permutation function.

23. The method according to claim 1, characterized in that, The method further includes: Receive an indication of the antenna port of the CSI-RS resource, or the row and column indices of the CSI-RS port to the antenna port layout, or the mapping or association to each entry of the precoded vector.

24. The method according to claim 1, characterized in that, The CSI-RS port to antenna port layout of the M CSI-RS resources column sum The mapping of rows is indicated by the network nodes.

25. A method for receiving a Channel State Information (CSI) report from a wireless device (700) in a wireless communication network, the CSI report indicating a precoding matrix, the method being performed by a network node (800), characterized in that, The method includes: Send (501) to the wireless device (700): Configuration or indication, wherein the configuration or indication represents the number of a first dimension or column of the antenna port layout at the network node. And the number of the second dimension or rows ;as well as Configuration or indication, the configuration or indication representing M Each Channel State Information Reference Signal (CSI-RS) resource includes multiple antenna ports or CSI-RS ports, wherein the antenna ports or CSI-RS ports of each CSI-RS resource are mapped to a subset or proper subset of the row and column indices of the antenna port layout. So that the wireless device can: For each CSI-RS resource, determine entries of precoding vectors associated with a subset or proper subset of the row and column indices of the antenna port layout; Determine for use RI A precoding matrix for each transport layer, wherein the precoding matrix includes v There are n precoding vectors, and each precoding vector has Each precoded vector is associated with a transport layer; Generate a CSI report or CSI feedback report for transmission to the network node, the report including a precoding matrix indicator (PMI) indicating the precoding vector or precoding matrix; and Uplink control information (UCI) including the CSI report is received (502) from the wireless device (700) via the uplink (UL) channel.

26. A network node (800), characterized in that, It includes a processor (810) and a memory (820) storing instructions executable by the processor (810) to cause the network node (800) to perform the method as described in claim 25.

27. A wireless device (700), characterized in that, It includes a processor (710) and a memory (720) storing instructions executable by the processor (710) to cause the wireless device (700) to perform the method as described in any one of claims 1 to 24.

Images