859 results about "Precoding matrix" patented technology

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.

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, 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.

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.

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.

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.

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.

The invention relates to a low-complexity multi-user hybrid precoding method and system and a storage medium, and belongs to the technical field of wireless communication. According to the method, a hybrid precoding system model is established based on a millimeter wave broadband multi-user communication scene, a steering vector is constructed through channel state information feedback or direction of arrival estimation, an analog precoding matrix is initialized, an equivalent channel is further constructed in combination with channel feedback information, singular value decomposition is carried out, and a digital precoding matrix is generated. And the precoding structures of the receiving end and the transmitting end are iteratively optimized under the constant modulus constraint. The system comprises a modeling module, a steering vector initialization module, a digital pre-coding module and a pre-coding optimization module, and all the modules work cooperatively to realize low-complexity pre-coding design. According to the method, the precoding calculation complexity in a multi-user broadband system is effectively reduced, the stability of precoding design and the spectrum utilization efficiency are improved, and the method has good robustness and engineering realizability and is suitable for a next-generation wireless communication system.

A communication method includes the following. A terminal device sends a first physical uplink shared channel (PUSCH) and a second PUSCH. The terminal device corresponds to N sounding reference signal (SRS) resource sets, the first PUSCH is associated with a first SRS resource set among the N SRS resource sets, the second PUSCH is associated with a second SRS resource set among the N SRS resource sets, and the first SRS resource set is different from the second SRS resource set. The terminal device includes M antenna ports. A first precoding matrix for the first PUSCH and a second precoding matrix for the second PUSCH belong to a first precoding matrix set, a non-zero element in a column vector of each precoding matrix in the first precoding matrix set is less than or equal to M / N, and M and N are integers greater than or equal to 2.

A method and apparatus for performing uplink transmission and reception in a wireless communication system are disclosed. According to an embodiment of the present disclosure, a method for performing uplink transmission in a wireless communication system may include: transmitting capability information related to a codebook subset for uplink transmission supported by the UE to a base station; receiving configuration information related to a codebook subset based on the capability information from the base station; and performing the uplink transmission based on the configuration information, and the capability information includes a first type of partial coherent codebook subset or a second type of partial coherent codebook subset, and the first type of partial coherent codebook subset includes at least one first precoding matrix having four zeros and four non-zero values per column, and the second type of partial coherent codebook subset includes at least one second precoding matrix having six zeros and two non-zero values for each column.

The present disclosure relates to a method by which a user equipment (UE) transmits predicted channel status information (CSI) to a base station (BS) in a wireless communication system. Specifically, the method comprises: receiving at least one channel measurement resource (CMR) from the BS; calculating precoding matrix indexes (PMIs) for two or more time instances on the basis of the at least one CMR; calculating a first channel quality indicator (CQI) for a first time instance on the basis of the PMI for the first time instance from among the two or more time instances; calculating a second CQI for a second time instance on the basis of the PMI for the second time instance from among the two or more time instances; and transmitting the predicted CSI including the first CQI and the second CQI to the BS.

Methods and apparatuses for PUSCH transmission for partial coherent UE with 8 antenna ports 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 scheduling a PUSCH, wherein the DCI includes an antenna port(s) field indicating the number of DMRS ports that determines a rank of the scheduled PUSCH, and the DCI further includes a TPMI field indicating one or two precoding matrices; and determine the precoding matrix for the scheduled PUSCH according to the rank and the one or two precoding matrices.

The invention discloses a joint distributed precoding and beamforming method for RIS-assisted cellular removal large-gauge MIMO (Multiple Input Multiple Output) under electromagnetic interference (EMI). Specifically, the method comprises the following steps: constructing an RIS-assisted cellular-removal large-scale MIMO downlink model under electromagnetic interference; a distributed processing framework based on joint optimization is provided, and a combined vector, a transmitting end active precoding matrix and RIS passive beam forming are received through collaborative design; an efficient distributed alternating optimization algorithm is developed, and a minimum system weighted mean square error (MSE) is taken as a target function. Compared with a traditional centralized algorithm, the scheme provided by the invention has the advantage that the calculation complexity is reduced while the similar performance is kept. A simulation experiment shows that compared with other reference schemes, the scheme can effectively improve the system performance under electromagnetic interference, and the reliability and practicability of the method in a complex electromagnetic environment are verified.

Methods, systems, and devices for wireless communications are described. A UE may receive one or more control messages that indicate a quantity of a set of sounding reference signal (SRS) resource sets configured for codebook usage and at least one maximum rank value associated with uplink shared channel transmissions by the UE. The UE may receive downlink control information (DCI) with an SRS resource indicator (SRI) field and a transmit precoding matrix indicator (TPMI) field. The UE may then interpret the SRI and TPMI fields according to a mapping that is based on the maximum rank value and a maximum quantity of ports the UE is capable of supporting. Then, the UE may transmit the uplink shared channel message in accordance with the mapping.

A method of wireless communication includes determining a first precoding matrix indicator (PMI) value and a second PMI value, the first PMI value indicating a first matrix W1 of a first codebook C1, the second PMI value indicating a second matrix W2 of a second codebook C2, wherein the first matrix W1 and the second matrix W2 together define a precoding matrix W for multi-antenna transmission. The method also includes transmitting the first PMI value at a first periodicity, and transmitting the second PMI value at a second periodicity shorter than the first periodicity. In some examples, the method also includes transmitting a rank indicator (RI) value, where the first PMI value and the second PMI value are determined based on the RI value.

A communication method, apparatus and system. The method comprises: determining a first codebook type and a plurality of first parameters associated with the first codebook type; and on the basis of the first codebook type and the plurality of first parameters, sending a plurality of first precoding matrix indicators (PMIs), wherein the plurality of first PMIs are obtained on the basis of channel measurement of a first reference signal, and the plurality of first parameters correspond to the plurality of first PMIs. By means of the method, a terminal device uses a first codebook type of different precisions to feed back a plurality of first PMIs, thereby achieving the aim of balancing feedback overheads and system performance.

Logic may determine a precoder matrix indicator (PMI). Logic may pre-process the channel matrix to generate an input matrix for an encoder neural network (NN). Logic may infer a set of PMI bits with an encoder NN based on an input matrix. Logic may cause a set of PMI bits to be transmitted in a channel state information (CSI) report via an interface. Logic may decode a communication including a CSI report from another station, a set of PMI bits generated via an encoder NN and received via an interface. Logic may parse the set of PMI bits from the CSI report. And logic may infer, via the decoder NN, a precoding matrix based on the set of PMI bits.

The invention provides a communication method and a communication device, and relates to the field of communication. The method comprises the following steps: receiving first information from a first communication device; a first reference signal is transmitted to a first communication device. Wherein the first information comprises the information of the target path, or the first information comprises the information of the target path and the information of a non-target path. The target path is a path related to the target area or the to-be-perceived target, and the target area is an area where the to-be-perceived target is located. The first reference signal is pre-coded by adopting a pre-coding matrix determined according to the first information, and the first reference signal is used for sensing the target to be sensed. Based on the method, the second communication device can determine the pre-coding matrix of the first reference signal according to the information of the target path or the information of the target path and the non-target path provided by the first communication device, so that the energy of the first reference signal on the target path is relatively strong, and meanwhile, the energy of the first reference signal on the non-target path is inhibited; and the sensing performance is improved.

This application discloses a communication method and a communication apparatus. In the method, A communication apparatus determines first information, where the first information indicates a precoding matrix, and the first information includes a plurality of coefficients Cl,i,f,d, where l is a transport layer sequence number, i is a channel state information reference signal (CSI-RS) port sequence number or a spatial domain basis sequence number, f is a frequency domain basis sequence number, d is a Doppler domain basis sequence number, the coefficient Cl,i,f,d corresponds to a priority indication Pri(l, i, f, d), and the coefficients Cl,i,f,d in the first information are arranged based on Pri(l, i, f, d). The communication apparatus sends the first information to a network device.

New mechanisms for channel measurement and interference measurement between an aggressor and victim wireless includes transmitting a set of Reference Signals (RS) to a victim wireless device including M RS resources, wherein M is an integer larger than 1, and wherein an ith individual RS resource of the M RS resources includes Pi RS ports, wherein i is an integer and 1≤i≤M, and wherein Pi is an integer and Pi≥1. The method may include receiving a measurement report regarding the RS including a Precoding Matrix Indicator (PMI) report and a phase offset report. In another embodiment, a method includes indicating a RS configuration and a Cross Link Interference (CLI) measurement resource configuration, wherein each RS includes an aggressor ID, and wherein the CLI measurement resource configuration associates each one of the RS with CLI measurement resources. The method may also include transmitting the RS according to the RS configuration.

Methods and systems for compression of channel state information (CSI) using machine learning models are described, including the use of a physics-based regularizer in training and inference. At a user equipment (UE), a precoding matrix is obtained. The precoding matrix is compressed into a low-dimensional representation using a first model, which may be an encoder model. CSI feedback is transmitted, including the low-dimensional representation and an indicator based on the precoding matrix, the regularizer value representing a characteristic of the precoding matrix.

Methods, apparatus, and systems that relate to determination of the precoding matrix are disclosed. In one example aspect, a method for digital communication includes determining, by a first communication node, a precoding matrix that is based on a first vector having N1 elements. An element of the first vector is based on a first product of n and a first parameter, and a second product of n2 and a second parameter. n is an integer that corresponds to an index of the element of the first vector and N1 is a positive integer. The method also includes, by the first communication node, an indicator to a second communication node indicating the precoding matrix. The indicator includes information of at least one of the first parameter or the second parameter.

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.

Systems and methods are disclosed for enabling channel state information (CSI) processing and reporting. A user equipment (UE) receives a CSI reporting configuration and measurements on CSI Reference Signal (CSI-RS) resources from a configured set, where some resources may be unavailable due to collisions or timing constraints. The UE measures CSI-RS on available resources from a subset, calculates and reports CSI based on the CSI-RS, with CSI-RS ports across resources used jointly for determining various values. When another subset is cancelled or dropped, the CSI is processed using zero channel power assumptions or adaptive precoding matrix calculations based on available resources. The UE calculates CSI performance metrics based on channel measurements and configuration parameters received from the network. The metrics quantify aspects, used by the UE to select appropriate CSI reporting configurations. The UE reports the metrics to the network or uses the metrics to adapt CSI content.

Example embodiments of the present disclosure relate to methods, devices, and computer storage medium for communication. A terminal device determines a first set of Channel Quality Indicators (CQI) conditioned on a first Precoding Matrix Indicator (PMI), the first PMI corresponding to a first time unit. A second timing of the first time unit is not earlier than a first timing of a first time duration for reporting Channel State Information (CSI). Then, the terminal device transmits a CSI report comprising the first set of CQIs and the first PMI to a network device in the first time duration.

Systems and methods to support Physical Uplink Shared Channel (PUSCH) multi-Transmission / Reception Point (TRP) scheduling are provided. In some embodiments, the wireless device performs one or more of: obtaining a configuration for Transmission Configuration Indicator (TCI) states for Uplink (UL) PUSCH scheduling; activating / deactivating a subset of configured TCI states). If two TCI states are indicated, the wireless device transmits two different PUSCHs each corresponding to one of the indicated TCI states. If one TCI state is indicated, the wireless device transmits a single PUSCH corresponding to the indicated TCI state. The wireless device maps indicated TCI states to the transmission occasions or actual repetitions is preconfigured via higher layer parameter(s) or is given by a predefined rule. The wireless device applies a Transmitted Precoding Matrix Indicator (TPMI) to transmission occasions or actual repetitions associated with each indicated TCI state based on a signaled value and / or a predefined value.