1111 results about "Precoding matrix" patented technology

Systems, methods, and instrumentalities are described herein for joint transmission (JT) channel state information (CSI) reporting. Joint transmission CSI may be coherent JT CSI or non-coherent JT CSI. Feedback overhead may be reduced, for example, if reporting CSI for multiple transmission / reception points (TRPs). Precoding matrix indicators (PMIs) and / or co-phasing information for TRPs in JT (e.g., coherent JT or non-coherent JT) may be reported. A wireless transmit / receive unit (WTRU) may be configured to employ operations to reduce feedback overhead and / or report PMIs and / or co-phasing information for TRPs in JT.

The invention discloses a wireless public network communication data transmission system based on multiple central stations, which relates to the technical field of data transmission and comprises a load sensing and balancing module, a path reconstruction module, a self-adaptive coding modulation module and a safety tunnel management module. The load sensing module realizes load balancing and stable transmission by monitoring indexes of a central station in real time and performing dynamic migration connection; the path reconstruction module adjusts and optimizes path parameters by using federal learning, dynamically adjusts a transmission path and optimizes path quality; the adaptive coding modulation module dynamically adjusts a modulation scheme according to channel conditions, generates a pre-coding matrix in combination with environment information, and improves the transmission efficiency; the security tunnel module adopts a plurality of encryption technologies and dynamic port hopping mechanisms to ensure the security of data transmission; according to the invention, the load balancing capability, the transmission efficiency and the security of the system are effectively improved, and the method is suitable for a complex and changeable wireless public network environment.

Systems and methods related to prioritization of non-zero coefficients for Channel State Information (CSI) for Coherent Joint Transmission (CJT) are disclosed. Embodiments of a UE and corresponding embodiments of a method performed by a UE for CJT CSI feedback in which non-zero coefficients of a precoding matrix indicator (PMI) feedback are prioritized are disclosed. Embodiment of a network node and corresponding embodiment of a method performed by a network node for CJT CSI feedback in which non-zero coefficients of a PMI feedback are prioritized are also disclosed.

Apparatuses, methods, and systems are disclosed for configuring a codebook corresponding to TPMI. One method includes receiving a codebook configuration from a network. The codebook configuration corresponds to an enhanced UL codebook-based transmission, the codebook corresponds to a TPMI, the TPMI corresponds to uplink transmission, and the TPMI corresponds to at least one layer. The method includes transmitting a set of SRSs. The method includes receiving the TPMI via a DCI for scheduling a PUSCH transmission. The DCI is received on a PDCCH, a PDSCH, or a combination thereof, and the DCI is decomposed into a first stage DCI and a second stage DCI. The method includes receiving a subset of codebook parameters corresponding to the TPMI in a second stage DCI. The second stage DCI is received in the PDCCH, the PDSCH, or a combination thereof.

Disclosed are a method and device for transmitting or receiving channel state information in a wireless communication system. A method performed by a terminal in a wireless communication system according to an embodiment disclosed herein may comprise the steps of: receiving one or more channel state information-reference signals (CSI-RSs) from a network; calculating one channel quality indicator (CQI) on the basis of a specific precoding matrix indicator (PMI) that is one of a plurality of PMIs respectively corresponding to a plurality of time units; and transmitting a CSI report, including the one CQI and codebook information corresponding to the plurality of PMIs, to the network, wherein the one CQI may be associated with the specific PMI and a specific time unit that is one of the plurality of time units.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive one or more reference signals from a plurality of transmit receive points (TRPs) associated with a network entity. The UE may transmit, to the network entity and based at least in part on the one or more reference signals, a coherent joint transmission (CJT) Type II channel state information (CSI) feedback report. The CJT Type II CSI feedback report may be based at least in part on a two-stage frequency domain (FD) basis reporting irrespective of a quantity of precoding matrix indicator (PMI) subbands. The CJT Type II CSI feedback report may be based at least in part on selecting coefficients from high-priority coefficients and excluding low-priority coefficients irrespective of coefficient strengths associated with the low-priority coefficients. Numerous other aspects are described.

A precoder index is derived from a precoder codebook using a low computationally complex process. A plurality of uplink channel matrix estimates are received at a Base Station (BS) from a User Equipment (UE). The plurality of uplink channel matrix estimates are processed to determine an indicator of the precoder having a highest spectral efficiency estimate. The indicator of the precoder having the highest spectral efficiency estimate is selected for transmission by the BS.

A method and device for transmitting or receiving improved codebook-based channel state information in a wireless communication system are disclosed. A method performed by a terminal in a wireless communication system, according to one embodiment of the present disclosure, comprises the steps of: receiving one or more channel state information (CSI)-reference signals (RS) from a network; and transmitting, to the network, one or more CSI reports including information indicating a first precoding matrix based on the one or more CSI-RSs and a channel quality indicator (CQI) based on a second precoding matrix, wherein the first precoding matrix is included in a set of precoding matrices defined on the basis of one or more predetermined codebooks, and the second precoding matrix can be determined on the basis of the first precoding matrix and one or more pieces of artificial intelligence (AI) / machine learning (ML) model-related information.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, an indication of an uplink resource associated with reporting channel state information (CSI). The UE may transmit, to the network node and using the uplink resource, uplink control information (UCI) including a CSI report that indicates precoding matrix indicator (PMI) values, based at least in part on prioritizing groups of information associated with the CSI report, at least one group, of the groups, being associated with time domain basis index values and non-zero coefficients of a coefficient matrix of a codebook associated with the CSI report. Numerous other aspects are provided.

A terminal according to one aspect of the present disclosure includes: a receiving section that receives, when the terminal includes eight antenna ports, downlink control information (DCI) including a plurality of fields of at least one of a precoding information and number of layers field and a transmission precoding matrix indicator (TPMI) field for codebook-based physical uplink shared channel (PUSCH) transmission; and a control section that controls uplink transmission, based on the DCI. According to one aspect of the present disclosure, UL transmission using more than four antenna ports can be appropriately controlled.

A method of a terminal performing codebook-based PUSCH transmission may comprise: receiving, from a base station, configuration information of an SRS resource set; receiving downlink reference signals from the base station through a spatial filter corresponding to the SRS resource set, and obtaining downlink channel values based on the received downlink reference signal; determining an SRS precoding matrix based on the downlink channel values, and transmitting, to the base station, an SRS to which the SRS precoding matrix is applied; receiving, from the base station, an SRI and precoding information determined based on the SRS; and determining a PUSCH precoding matrix based on SRS resource(s) indicated by the SRI and the precoding information, and transmitting, to the base station, a PUSCH to which the PUSCH precoding matrix is applied.

Various aspects of the present disclosure relate to techniques for joint CSI training and PMI feedback for AI-enabled networks. A user equipment (UE)s configured to receive, based on a CSI reporting setting, a set of RSs for a channel measurement corresponding to an NZP CSI-RS resource, generate a CSI report based on the channel measurement, the CSI report comprising precoding matrix information for a precoding matrix and a set of coefficients that correspond to at least one dimension of the precoding matrix, and transmit the CSI report to a network.

A method performed by a WTRU includes receiving channel state information (CSI) reporting configuration information indicating a plurality of matrices, a total number of rows and columns for each of the matrices, and an indication to report on non-zero coefficients (NZCs) and, receiving CSI reference signals (CSI-RS). The method determines a precoding matrix indicator (PMI) based on channel measurements associated with the CSI-RS, wherein the PMI includes, for each matrix an indication of a total number of NZCs per column for all columns having NZCs in at least one row and in less than all rows of the matrix, and an indication of a row index for each column of each of the columns having NZCs in at least one row and in less than all rows of the matrix. The method includes reporting the PMI to a network entity.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a channel state information (CSI) report setting indicating a report quantity and indicating one or more sets of CSI-RS resources identified by a CSI resource setting associated with the CSI report setting, wherein the report quantity includes a precoding matrix indicator (PMI) based at least in part on a joint CSI reference signal (CSI-RS) resource and CSI-RS port selection codebook, wherein a port selection is based at least in part on the CSI-RS resources indicated by the CSI resource setting. The UE may communicate with a base station in accordance with the CSI report setting, the CSI resource setting, and the codebook. Numerous other aspects are described.

The invention discloses a fluid antenna position and radar communication precoding matrix optimization method in a URLLC scene. The method comprises an integrated architecture supporting communication and perception of multiple user terminals and a single perception target; constructing a communication signal model between the base station and the user terminal in the URLLC scene and a sensing signal model between the base station and the detection target; establishing a mathematical model of a radar communication signal optimization problem by taking maximization of a radar sensing signal-to-noise ratio as a target and taking base station transmitting power, URLLC time delay requirements and fluid antenna position limitation as constraints; the optimization problem is decomposed into three sub-problems, an alternating iteration optimization algorithm is adopted, the three sub-problems are alternately optimized, and a convergence solution is obtained through iteration. According to the invention, the URLLC technology and the multiple-input-multiple-output antenna array and fluid antenna technology are utilized, communication and radar sensing are executed on the same frequency spectrum at the same time, and the requirements of communication and radar sensing in a future network are met.

Example embodiments of the present disclosure relate to methods, devices, and computer storage medium for communication. A method for communication comprises determining, at a terminal device, whether to apply Doppler / time domain compression or a Doppler / time domain basis type for reporting a precoding matrix indicator (PMI) to a network device. The method further comprises transmitting, to the network device, an indication of whether to apply the Doppler / time domain compression or the Doppler / time domain basis type. In this way, it is more flexible to switch between high / medium mobility and low mobility. Therefore, communication performance for high / medium mobility terminal devices can be improved, without increasing overhead for low mobility terminal devices.

Devices and methods for providing channel state information reporting for multi-transmission-reception-point coherent joint transmission in a wireless communication system. Channel state information configuration information is provided by a base station to a wireless device. The channel state information configuration information indicates one or more restrictions for the UE in reporting a precoding matrix indicator (PMI) for each of multiple transmission reception points. The wireless device provides a PMI to the base station based on the channel state information configuration information.

A method of beamforming for downlink (DL) transmission in a wireless communication system is provided. The method includes generating, by a base station of the wireless communication system, configuration information required to signal channel state information (CSI) to the BS, wherein the configuration information includes parameters of a code book, wherein the code book defines an overall set of spatial beams in which data streams can be transmitted from the BS, wherein each spatial beam is represented by a discrete Fourier transform (DFT) vector in the code book, and a parameter (NDFT) indicative of a maximum number of DFT vectors with one signal polarization in a precoding matrix, transmitting, by the BS, the configuration information from the base station to a user device (UE), based on CSI reference signals (CSI-RSs) received from the BS, choosing, by the UE, a number (L) of Multiple Input-Multiple Output (MIMO) layers.

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive and measure channel state information reference signals (CSI-RS) and synchronization signal blocks (SSB) from a network entity via a reference signal resource set. The UE may select reference signal resources from the reference signal resource set based on channel measurements associated with the selected reference signal resources. The UE may determine a downlink precoding matrix based on quasi-co-location (QCL) information associated with a reference signal resource. In some examples, the UE may receive an indication of the QCL information from the network entity. Accordingly, the UE may transmit a report indicating both the downlink precoding matrix and the reference signal resource associated with the QCL information. Upon receiving the report from the UE, the network entity may output one or more downlink messages using the downlink precoding matrix indicated by the report.

Methods, systems, and devices for wireless communications are described. Some wireless communications systems may support cross link interference (CLI) mitigation in full-duplex operations. For example, a first user equipment (UE) may encode and precode a first portion of a message according to a first modulation and coding scheme (MCS) and a first precoding matrix and a second portion of the message according to a second MCS and a second precoding matrix. The first precoding matrix may be based on a first communication link between the first UE and a network entity and the second precoding matrix may be based on the first communication link and a second communication link between the first UE and a second UE. The first UE may transmit the first portion of the message and the second portion of the message via beams associated with respective precoding matrices.

The present application provides a channel estimation method and a related apparatus, improving the accuracy of channel estimation. The method comprises: a terminal device receiving a first signal, the first signal being a signal received by the terminal device after a second signal sent by a network device passes through a wireless channel; receiving first information, the first information being used for indicating a first channel estimation parameter, and the first channel estimation parameter including at least one of the following: a matrix norm of a first expression and an iteration step size, wherein the first expression is determined by a precoding matrix, the first signal, and a kth channel estimation value, at least one of the matrix norm and the iteration step size is determined on the basis of the precoding matrix, k is a positive integer less than or equal to T, T is a positive integer, and T is the number of iterations of channel estimation; and on the basis of the first signal and the first channel estimation parameter, performing channel estimation T times to obtain a channel estimation result.

Apparatuses and methods for channel state information (CSI) reporting for an enhanced Type-I codebook a method performed by a user equipment (UE) includes receiving information about a CSI report. The information indicates codebookType set to ‘typeI-SinglePanel-r19’, codebookMode set to either ‘ModeA’ or ‘ModeB’, and PCSI-RS CSI reference signal (CSI-RS) antenna ports, where PCSI-RS>32. The method further includes, based on the information, determining the CSI report associated with the CSI-RS antenna ports, the CSI report including a precoding matrix indicator (PMI), and transmitting the CSI report.

The invention relates to a communication method and device, which can realize PUSCH transmission of Z antenna ports. Under the condition that Z is small, the method can be suitable for a more popular terminal with a small number of uplink transmitting antennas, so that the terminal cost is saved. The method comprises: a terminal transmitting a first physical uplink shared channel (PUSCH) of Z antenna ports. Wherein the Z antenna ports are pre-coded according to the third pre-coding matrix. The third pre-coding matrix comprises the first pre-coding matrix and / or the second pre-coding matrix, or the third pre-coding matrix comprises a sub-matrix of the second pre-coding matrix, and Z is a positive integer greater than 1. Wherein the first precoding matrix is a precoding matrix for PUSCH transmission of K antenna ports, K is a positive integer, the second precoding matrix is a precoding matrix for PUSCH transmission of Y antenna ports, Y = 2X, and X is a positive integer. Exemplary, K is equal to 1, Y is equal to 2, and Z is equal to 3; or Y = 4, and Z = 3.

A method for reporting channel status information (CSI) is performed by a terminal. The method includes: transmitting an uplink reference signal to a network device; receiving beamformed downlink pilot signals transmitted by the network device at T consecutive time points; estimating downlink effective channel information corresponding to the T consecutive time points according to the beamformed downlink pilot signals of the T consecutive time points; determining CSI corresponding to the T consecutive time points according to the downlink effective channel information corresponding to the T consecutive time points; and reporting the CSI to the network device.

A method performed by a UE for providing CSI feedback in the form of CSI reports in a wireless communication system includes receiving, from a gNB, higher layer configurations of one or more downlink reference signals, and CSI report configurations associated with the downlink reference signal configurations, and a radio signal including the downlink reference signals according to the one or more downlink reference signal configurations, the downlink reference signals provided over a configured number of frequency domain resources, time domain resources and one or more ports; determining, for each CSI report, a precoding matrix based on the downlink reference signals and two codebooks, and one or more non-zero combining coefficients for complex combining of one or more spatial domain and delay domain basis vectors; and reporting to the network node the CSI reports for the CSI report configurations.

Various aspects of the present disclosure relate to a user equipment (UE) for wireless communication including at least one memory and at least one processor coupled with the at least one memory and configured to cause the UE to transmit an indication to a network entity indicating UE capability, which includes an enhanced codebook for single-layer uplink multiple input multiple output (MIMO) transmissions, and receive, from the network entity, a transmit precoding matrix indicator (TPMI) indicating a value of the enhanced precoder codebook, wherein the enhanced precoder codebook includes a precoder for every combination in which the phase rotation of a first antenna port relative to each of one or more remaining antenna ports of the UE relative to a first antenna port is a multiple of 90 degrees, and the value is associated with a precoder of the enhanced precoder codebook to be used by the UE for uplink transmissions.

Methods and apparatuses for precoding indication for simultaneous multi-panel UL transmission are disclosed. In one embodiment, a UE comprises a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to receive, via the transceiver, a DCI containing at least one TPMI field indicating a precoding matrix, the DCI schedules a multi-panel simultaneous PUSCH transmission with up to 4 layers; and determine, for the UE equipped with a first panel and a second panel, a precoding matrix used for the first panel and a precoding matrix used for the second panel according to the at least one TPMI field.

Various aspects relate to channel state information (CSI) including a precoding matrix indicator (PMI). An apparatus (e.g., user equipment (UE)) generates a CSI report including a PMI for a precoding matrix and a channel quality indicator (CQI). The precoding matrix corresponds to layers with each layer associated with a spatial beam and a size of the set of layers determined by a rank indicator (RI). The precoding matrix is associated with a subset of CSI reference signal (RS)(CSI-RS) ports, and the PMI and the CQI are each associated with at least one of a wideband format or a subband format, with the subband format corresponding to reporting at least one of the PMI or the CQI for a subset of subbands of a bandwidth part associated with a CSI reporting setting. The apparatus transmits the CSI report including the RI, the PMI, and the CQI to a network entity.

In some implementations, a transmitter may determine that a difference between a total age of incorrect information (AoII) obtained in a current iteration of an iterative algorithm and a total AoII in a previous iteration of the iterative algorithm satisfies a tolerance factor for algorithm convergence. The transmitter may use the iterative algorithm to solve a convex optimization problem based on a plurality of iterations that continue until an objective function associated with AoII converges to within the tolerance factor for algorithm convergence. The transmitter may determine a precoder matrix and a vector of scheduling indicators from a solving of the convex optimization problem. The transmitter may transmit, using a downlink multi-user communication framework based on rate-splitting multiple access (RSMA) in a semantic-aware network, one or more updates to one or more receivers based on the precoder matrix and the vector of scheduling indicators.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration of a power mode for transmitting eight uplink transmission chains, wherein the power mode is one of a full-power mode or a non-full-power mode, and wherein at least a first set of precoding matrices is associated with the full-power mode and at least a second set of precoding matrices is associated with the non-full-power mode. The UE may receive an indication of a selected precoding matrix, wherein the indication is based at least in part on the configuration of the power mode and one of the first set of precoding matrices or the second set of precoding matrices. The UE may transmit the eight uplink transmission chains based at least in part on the selected precoding matrix. Numerous other aspects are described.