Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives information relating to a rank; and a control unit that controls transmission of a specific rank corresponding to reconstructed CSI or quasi-reconstructed CSI corresponding to channel state information (CSI) reconstructed by the base station. According to one embodiment of the present disclosure, appropriate CSI feedback using AI can be realized.

Description

Technical Field

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). In addition, for the purpose of further large capacity, advancement, etc. of LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) has been standardized.

[0003] Subsequent systems of LTE are also being studied (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] Prior Art Documents

[0005] Non-Patent Documents

[0006] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] Regarding future wireless communication technologies, artificial intelligence (AI) technologies such as machine learning (ML) are being studied for flexible use in controlling and managing networks / devices. For example, regarding future wireless communication technologies, AI technologies are being studied for improving channel state information (CSI) feedback, such as reducing overhead, improving accuracy, and prediction. CSI feedback based on AI technology can also be referred to as AI-aided CSI feedback or AI-based CSI feedback.

[0009] However, the specific details of AI-aided CSI feedback have not been studied. If they are not properly specified, there is a concern that appropriate CSI feedback using AI cannot be performed. As a result, it is not possible to achieve appropriate overhead reduction / high-precision channel estimation / high-efficiency resource utilization, and there is a concern that the improvement of communication throughput / communication quality is suppressed.

[0010] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can achieve appropriate CSI feedback using AI.

[0011] Means for Solving the Problem

[0012] A terminal according to an aspect of the present disclosure includes: a receiving unit that receives information related to a rank; and a control unit that controls the transmission of a specific rank corresponding to a reconstructed CSI or a quasi-reconstructed CSI corresponding to the channel state information (CSI) reconstructed with a base station.

[0013] Advantageous Effects of the Invention

[0014] According to an aspect of the present disclosure, appropriate CSI feedback using AI can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram showing an example of a framework for managing an AI model.

[0016] Figure 2 It is a diagram showing an example of specifying an AI model.

[0017] Figure 3 It is a diagram showing an example of an AI model.

[0018] Figure 4 It is a diagram showing an example of AI-based CSI feedback.

[0019] Figure 5 This is a diagram showing an example of processing when the UE has a decoder.

[0020] Figure 6 This is a diagram showing an example of CSI reconstruction using a proxy model.

[0021] Figure 7 This is a diagram showing an overview of CSI reporting.

[0022] Figure 8 This is a diagram showing an application example of the pre - processed H.

[0023] Figure 9 This is a diagram showing an example of the processing of Mode 2.2.

[0024] Figure 10 This is a diagram showing RI, LI, CQI, and CRI in the case of codebookType = typeI - SinglePanel in Rel.17 or when'repcri - RI - CQI' is set for reportQuantity.

[0025] Figure 11 This is a diagram showing an overview of Mode 5.1.

[0026] Figure 12 This is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment.

[0027] Figure 13 This is a diagram showing an example of the structure of a base station according to an embodiment.

[0028] Figure 14 This is a diagram showing an example of the structure of a user terminal according to an embodiment.

[0029] Figure 15 This is a diagram showing an example of the hardware structure of a base station and a user terminal according to an embodiment.

[0030] Figure 16 This is a diagram showing an example of a vehicle according to an embodiment. Detailed implementation mode

[0031] (Application of Artificial Intelligence (AI) technology to wireless communication)

[0032] Regarding future wireless communication technologies, research is being conducted on the flexible use of AI technologies such as Machine Learning (ML) for network / device control, management, etc.

[0033] For example, regarding future wireless communication technologies, AI technologies are being studied for improving channel state information (Channel State Information Reference Signal (CSI)) feedback (e.g., reducing overhead, improving accuracy, prediction), improving beam management (e.g., improving accuracy, prediction in the time domain / space domain), improving position measurement (e.g., improving position estimation / prediction), etc.

[0034] Figure 1 FIG. is an example of a framework for managing an AI model. In this example, each stage associated with the AI model is represented by a block. This example also represents the life cycle management (LCM) of the AI model.

[0035] The data collection stage corresponds to the stage of collecting data for the generation / update of the AI model. The data collection stage may also include data arrangement (e.g., determining which data to transfer for model training / model inference), data transfer (e.g., transferring data to an entity (e.g., UE, gNB) that performs model training / model inference), etc.

[0036] In the model training stage, model training is performed based on the data transferred from the collection stage (training data). This stage may also include data preparation (e.g., performing preprocessing, cleaning, formatting, conversion, etc. of the data), model training / validation, model testing (e.g., verifying whether the trained model meets the performance threshold), model exchange (e.g., transferring the model for distributed learning), model deployment / update (deploying / updating the model to an entity that performs model inference), etc.

[0037] In the model inference stage, model inference is performed based on the data transferred from the collection stage (inference data). This stage may also include data preparation (e.g., performing preprocessing, cleaning, formatting, conversion, etc. of the data), model inference, model monitoring (e.g., monitoring the performance of model inference), model performance feedback (feedbacking the model performance to an entity that performs model training), output (providing the output of the model to an actor), etc.

[0038] The actor stage may also include action trigger (e.g., determining whether to trigger an action on other entities), feedback (e.g., feedbacking information required for training data / inference data / performance feedback), etc.

[0039] In addition, for example, the training of a model for mobility optimization can also be carried out in, for example, the operation and maintenance management (operation, administration, and maintenance (OAM)) / gNodeB (gNB) in a network (NW). In the former case, interoperability, large-capacity storage, operator manageability, and model flexibility (such as feature engineering) are advantageous. In the latter case, it is advantageous in terms of no latency for model updates, data exchange for model decompression, etc. The inference of the above model can also be carried out in the gNB, for example.

[0040] In addition, depending on the use case, the entity for training / inference can also be different.

[0041] For example, for AI-assisted beam management based on measurement reports, it can also be that OAM / gNB performs model training and gNB performs model inference.

[0042] For AI-assisted UE-assisted positioning, it can also be that the Location Management Function (LMF) performs model training and the LMF performs model inference.

[0043] For CSI feedback / channel estimation using an autoencoder, it can also be that OAM / gNB / UE performs model training and gNB / UE (jointly) performs model inference.

[0044] For AI-assisted beam management based on beam measurement or AI-assisted UE-based positioning, it can also be that OAM / gNB / UE performs model training and UE performs model inference.

[0045] However, it is desirable to handle data / AI models as proprietary assets. For example, a large amount of cost / time is spent in the production of a high-precision AI model. Therefore, if the content of an AI model produced by a certain enterprise is known to other companies, it will be a great disadvantage. Therefore, research is being conducted to prevent UE / gNB provided by different suppliers from being able to utilize (or make it impossible to speculate) a part of the information related to the AI model.

[0046] The model approach based on an Identifier (ID) can be one of the management methods for AI models in such scenarios. For example, although NW / gNB does not know the details of the AI model, for AI model management, it can know only a part of the information of the AI model (for example, in the UE, which ML model is used for what).

[0047] Figure 2 FIG. is an example showing the designation of an AI model. In this example, the UE and NW (e.g., BaseStation (BS)) can identify Model #1 and Model #2 (the details of the model may not be fully understood). For example, the UE may report the performance of Model #1 and the performance of Model #2 to the NW, and the NW may instruct the UE on the AI model to be used.

[0048] In the present disclosure, the UE / BS may also input channel state information, reference signal measurement values, etc. to the ML model and output high-precision channel state information / measurement values / beam selection / position, future channel state information / radiolink quality, etc.

[0049] In addition, in the present disclosure, AI can also be rewritten as an object (also referred to as object, entity, data, function, program, etc.) having at least one of the following characteristics:

[0050] · Estimation based on the observed or collected information;

[0051] · Selection based on the observed or collected information;

[0052] · Prediction based on the observed or collected information.

[0053] In the present disclosure, the object can also be, for example, a device such as a terminal or a base station. In addition, in the present disclosure, the object can also correspond to a program / model / entity operating in the device.

[0054] In addition, in the present disclosure, the ML model can also be rewritten as an object having at least one of the following characteristics:

[0055] · Generate an estimated value by providing information;

[0056] · Predict an estimated value by providing information;

[0057] · Discover features by providing information;

[0058] · Select an operation by providing information.

[0059] In addition, in the present disclosure, AI, AI / ML, AI / ML model, ML model, model, AI model, predictive analytics, predictive analytics model, etc. can also be rewritten mutually. In addition, the ML model can also be derived using at least one of regression analysis (e.g., linear regression analysis, multiple regression analysis, logistic regression analysis), support vector machine, random forest, neural network, deep learning, etc. In the present disclosure, the model can also be rewritten as at least one of an encoder, a decoder, a tool, etc.

[0060] Based on the input information, the ML model outputs at least one piece of information such as an estimated value, a predicted value, a selected operation, a classification, etc.

[0061] The ML model can also include supervised learning, unsupervised learning, reinforcement learning, etc. Supervised learning can also be used to learn general rules for mapping an input to an output. Unsupervised learning can also be used to learn the features of data. Reinforcement learning can also be used to learn operations for maximizing a goal.

[0062] In the present disclosure, generate, calculate, derive, etc. can also be rewritten mutually. In the present disclosure, implement, run, operate, execute, etc. can also be rewritten mutually. In the present disclosure, train, learn, update, retrain, etc. can also be rewritten mutually. In the present disclosure, inference, after-training, formal utilization, actual utilization, etc. can also be rewritten mutually. A signal can also be rewritten with a signal / channel.

[0063] (CSI report (CSI report or reporting))

[0064] In Rel.15 NR, a terminal (also referred to as a user terminal, user equipment (UE), etc.) generates (also referred to as determines, calculates, estimates, measures, etc.) channel state information (CSI) based on a reference signal (RS) (or the resources used for the RS), and transmits (also referred to as reports, feeds back, etc.) the generated CSI to a network (e.g., a base station). The CSI can also be transmitted to the base station using, for example, an uplink control channel (e.g., a physical uplink control channel (PUCCH)) or an uplink shared channel (e.g., a physical uplink shared channel (PUSCH)).

[0065] The RS used for the generation of CSI can also be, for example, at least one of a channel state information reference signal (CSI-RS), a synchronization signal / physical broadcast channel (SS / PBCH) block, a synchronization signal (SS), a demodulation reference signal (DMRS), etc.

[0066] The CSI-RS can also include at least one of a non-zero power (NZP) CSI-RS and CSI-interference management (CSI-IM). The SS / PBCH block is a block that includes an SS and a PBCH (and the corresponding DMRS), and can also be referred to as an SS block (SSB), etc. In addition, the SS can also include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0067] In addition, the CSI may also include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a L1-RSRP (Layer 1 Reference Signal Received Power), a L1-RSRQ (Reference Signal Received Quality), a L1-SINR (Signal to Interference plus Noise Ratio), a L1-SNR (Signal to Noise Ratio), etc.

[0068] The UE may also receive information related to the CSI report (report configuration information) and control the CSI report based on the report configuration information. For example, the report configuration information may also be the "CSI-ReportConfig" of an Information Element (IE) of Radio Resource Control (RRC). In addition, in the present disclosure, the RRC IE may also be rewritten with the RRC parameters, high-layer parameters, etc.

[0069] The report configuration information (e.g., the "CSI-ReportConfig" of the RRC IE) may also include at least one of the following, for example.

[0070] · Information related to the type of CSI report (report type information, e.g., the "reportConfigType" of the RRC IE);

[0071] · Information related to one or more quantities (quantities) of the CSI to be reported (one or more CSI parameters) (report quantity information, e.g., the "reportQuantity" of the RRC IE);

[0072] · Information related to the resource for RS used in the generation of this quantity (this CSI parameter) (resource information, e.g., "CSI-ResourceConfigId" in RRCIE);

[0073] · Information related to the frequency domain that is the object of the CSI report (frequency domain information, e.g., "reportFreqConfiguration" in RRC IE).

[0074] For example, the report type information can also represent (indicate) a periodic CSI (Periodic CSI (P-CSI)) report, an aperiodic CSI (Aperiodic CSI (A-CSI)) report, or a semi-persistent CSI (Semi-Persistent CSI (SP-CSI)) report.

[0075] In addition, the reported quantity information can also specify at least one combination of the above CSI parameters (e.g., CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0076] In addition, the resource information can also be the ID of the resource for RS. This resource for RS can also include, for example, a CSI-RS resource with non-zero power or an SSB, as well as a CSI-IM resource (e.g., a CSI-RS resource with zero power).

[0077] In addition, the frequency domain information can also represent the frequency granularity of the CSI report. This frequency granularity can also include, for example, wideband and subbands. The wideband is the entire CSI reporting band. The wideband can be, for example, the entire certain carrier (Component Carrier (CC), cell, serving cell), or the entire bandwidth part (Bandwidth part (BWP)) within a certain carrier. The wideband can also be referred to as the CSI reporting band, the entire CSI reporting band, etc.

[0078] In addition, a subband is a part within the wideband and can be composed of one or more resource blocks (Resource Block (RB) or Physical Resource Block (PRB)). The size of the subband can also be determined according to the size of the BWP (number of PRBs).

[0079] The frequency domain information can also indicate which of the wideband or subbands the PMI is reported for (the frequency domain information can also include, for example, the "pmi-FormatIndicator" of the RRC IE for determining either wideband PMI reporting or subband PMI reporting). The UE can also determine the frequency granularity of the CSI report (i.e., either wideband PMI reporting or subband PMI reporting) based on at least one of the above-reported quantity information and the frequency domain information.

[0080] In the case where wideband PMI reporting is set (determined), one wideband PMI can also be reported for the entire CSI reporting band. On the other hand, in the case where subband PMI reporting is set, it can also be that a single wideband indication i1 is reported for the entire CSI reporting band, and one subband indication i2 (e.g., the subband indication for each subband) for each of more than one subband within the entire CSI report is reported.

[0081] The UE uses the received RS to perform channel estimation and estimates the channel matrix H. The UE feeds back the index (PMI) determined based on the estimated channel matrix.

[0082] The PMI can also indicate the precoder matrix (which can also be simply referred to as the precoder) that the UE believes is suitable for the downlink (downlink (DL)) transmission to the UE. Each value of the PMI can also correspond to a precoder matrix. The set of values of the PMI can also correspond to a set of different precoder matrices referred to as the precoder codebook (which can also be simply referred to as the codebook).

[0083] In the space domain, the CSI report can also include more than one type of CSI. For example, the CSI can include at least one of the first type (type 1 CSI) for the selection of a single beam and the second type (type 2 CSI) for the selection of multiple beams. A single beam can also be referred to as a single layer, and multiple beams can also be referred to as multiple beams. In addition, type 1 CSI may not assume multi-user multiple input multiple output (multiple input multiple output (MIMO)), and type 2 CSI may assume multi-user MIMO.

[0084] The above codebook may also include a codebook for type 1 CSI (also referred to as type 1 codebook, etc.) and a codebook for type 2 CSI (also referred to as type 2 codebook, etc.). In addition, type 1 CSI may also include type 1 single-panel CSI and type 1 multi-panel CSI, and may be specified with different codebooks respectively (type 1 single-panel codebook, type 1 multi-panel codebook).

[0085] In the present disclosure, type 1 and type I may also be rewritten with each other. In the present disclosure, type 2 and type II may also be rewritten with each other.

[0086] The uplink control information (UCI) type may also include at least one of Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), scheduling request (SR), and CSI. UCI may be carried by either PUCCH or PUSCH.

[0087] In Rel.15 NR, UCI can include one CSI part for wideband PMI feedback. When CSI report #n is reported, it includes wideband PMI information.

[0088] In Rel.15 NR, UCI can include two CSI parts for subband PMI feedback. CSI part 1 includes wideband PMI information. CSI part 2 includes one wideband PMI information and several subband PMI information. CSI part 1 and CSI part 2 are encoded separately.

[0089] (AI model information)

[0090] In the present disclosure, AI model information may also refer to information including at least one of the following:

[0091] · Information on the input / output of the AI model;

[0092] · Information on the preprocessing / postprocessing for the input / output of the AI model;

[0093] · Information on the parameters of the AI model;

[0094] · Information for training the AI model (training information);

[0095] · Information for inference of the AI model;

[0096] · Performance information related to the AI model.

[0097] Here, the information on the input / output of the above AI model may also include information related to at least one of the following:

[0098] · The content of the input / output data (e.g., RSRP, SINR, amplitude / phase information in the channel matrix (or precoding matrix), information related to the Angle of Arrival (AoA), information related to the Angle of Departure (AoD), location information);

[0099] · The auxiliary information of the data (which can also be referred to as Meta information);

[0100] · The type of the input / output data (e.g., immutable value, floating point number);

[0101] · The quantization interval (step size) of the input / output data (e.g., for L1-RSRP, it is 1 dBm);

[0102] · The range that the input / output data can take (e.g., [0,1]).

[0103] In addition, in the present disclosure, the information related to AoA may also include information related to at least one of the azimuth angle of arrival and the zenith angle of arrival (ZoA). Furthermore, the information related to AoD may also include, for example, information related to at least one of the azimuth angle of departure and the zenith angle of departure (ZoD).

[0104] In the present disclosure, the location information may also be location information related to the UE / NW. The location information may also include information obtained using a positioning system (e.g., a satellite positioning system (Global Navigation Satellite System (GNSS)), Global Positioning System (GPS), etc.) (e.g., latitude, longitude, altitude), information about the base stations adjacent to (or serving) the UE (e.g., the identifier (ID) of the base station / cell, the distance between the BS and the UE, the direction / angle of the BS (UE) observed from the UE (BS), the coordinates of the BS (UE) observed from the UE (BS) (e.g., the coordinates of the X / Y / Z axes), etc.), a specific address of the UE (e.g., an Internet Protocol (IP) address), etc., at least one of which. The location information of the UE is not limited to information based on the location of the BS, and may also be information based on a specific point.

[0105] The location information may also include information related to its own implementation (e.g., the location / position / orientation of the antenna, the location / orientation of the antenna panel, the number of antennas, the number of antenna panels, etc.).

[0106] The location information may also include mobility information. The mobility information may also include information representing at least one of the mobility type, the moving speed of the UE, the acceleration of the UE, the moving direction of the UE, etc.

[0107] Here, the mobility type may also correspond to at least one of a fixed location UE, a movable / moving UE, a no mobility UE, a low mobility UE, a middle mobility UE, a high mobility UE, a cell-edge UE, a not-cell-edge UE, etc.

[0108] In the present disclosure, the environmental information (for data) may also be information related to the environment in which the data is acquired / used. For example, it may also include frequency information (such as band ID, etc.), environmental type information (information indicating at least one of indoor, outdoor, Urban Macro (UMa), Urban Micro (Umi), etc.).

[0109] In the present disclosure, the meta-information may also mean, for example, information related to the input / output information suitable for the AI model, information related to the acquired / acquirable data, etc. Specifically, the meta-information may also include information related to the beams of RS (such as CSI-RS / SRS / SSB, etc.) (for example, the angle pointed by each beam, the 3dB beam width, the shape of the pointed beam, the number of beams), the layout information of the antennas of the gNB / UE, frequency information, environmental information, meta-information ID, etc. In addition, the meta-information may also be used as the input / output of the AI model.

[0110] The information for preprocessing / postprocessing for the input / output of the above AI model may also include information related to at least one of the following:

[0111] · Whether to apply normalization (such as Z-Score normalization (standardization), min-max normalization);

[0112] · The parameters for normalization (for example, the mean / variance for Z-Score normalization, the minimum / maximum for min-max normalization);

[0113] · Whether to apply a specific numerical transformation method (such as one hot encoding, label encoding, etc.);

[0114] · Whether to be used as a selection rule for training data.

[0115] For example, it is also possible to perform Z-Score normalization (x new =(x - μ) / σ. Here, μ is the mean of x and σ is the standard deviation) on the input information x as preprocessing, and then input the normalized input information x new into the AI model, and apply postprocessing to the output y out from the AI model to obtain the final output y.

[0116] The information of the parameters of the above AI model may also include information related to at least one of the following:

[0117] · Information on the weights in the AI model (such as the coefficients (combination coefficients) of neurons);

[0118] · The structure of the AI model;

[0119] · The types of AI models as model components (e.g., Residual Network (ResNet), DenseNet, RefineNet, Transformer model, CRBlock, Recurrent Neural Network (RNN), Long Short-Term Memory (LSTM), Gated Recurrent Unit (GRU));

[0120] · The functions of AI models as model components (e.g., decoder, encoder).

[0121] Additionally, the weight information in the above AI model may also include information related to at least one of the following:

[0122] · The bit width (size) of the weight information;

[0123] · The quantization interval of the weight information;

[0124] · The granularity of the weight information;

[0125] · The range that the weight information can take;

[0126] · The parameters of the weights in the AI model;

[0127] · Information about the difference from the AI model before update (in the case of update);

[0128] · The method of weight initialization (e.g., zero initialization, random initialization (based on normal distribution / uniform distribution / truncated normal distribution), Xavier initialization (for sigmoid function), He initialization (for Rectified Linear Units (ReLU))).

[0129] In addition, the structure of the above AI model may also include information related to at least one of the following:

[0130] · The number of layers;

[0131] · The types of layers (e.g., convolutional layer, activation layer, dense layer, normalization layer, pooling layer, Attention layer);

[0132] · Layer information;

[0133] · Parameters specific to the time series (e.g., bidirectionality, time step);

[0134] · Parameters for training (e.g., type of function (L2 regularization, dropout function, etc.), where to set the function (e.g., after which layer)).

[0135] The above layer information may also include information related to at least one of the following:

[0136] · The number of neurons in each layer;

[0137] · Kernel size;

[0138] · Stride for the pooling layer / convolution layer;

[0139] · Pooling method (MaxPooling, AveragePooling, etc.);

[0140] · Information on the residual block;

[0141] · Number of heads;

[0142] · Normalization method (Batch normalization, instance normalization, layer normalization, etc.);

[0143] · Activation function (sigmoid, tanh function, ReLU, information on Leaky ReLU, Maxout, Softmax).

[0144] Figure 3 It is a diagram showing an example of an AI model. This example shows an AI model that includes ResNet as Model component #1, a Transformer model as Model component #2, a dense layer, and a normalization layer. In this way, a certain AI model can also be included as a component of other AI models. Additionally, Figure 3 it can also be an AI model in which processing is performed in the order from left to right.

[0145] The training information for the above AI model may also include information related to at least one of the following:

[0146] · Information for optimizing the algorithm (e.g., type of optimization (Stochastic Gradient Descent (SGD)), AdaGrad, Adam, etc.), parameters of optimization (learning rate, momentum information, etc.),

[0147] · Information on the loss function (e.g., information related to the metrics of the loss function (Mean Absolute Error (MAE), Mean Square Error (MSE), Cross-Entropy Loss, NLLLoss (Negative Log Likelihood Loss), Kullback-Leibler (KL) divergence, etc.)),

[0148] · Parameters to be frozen for use in training (e.g., layers, weights),

[0149] · Parameters to be updated (e.g., layers, weights),

[0150] · Parameters to be used as initial parameters for training (parameters to be used as initial parameters) (e.g., layers, weights),

[0151] · Training / updating method of the AI model (e.g., number of (recommended) Epochs, batch size, number of data used in training).

[0152] The inference information for the above AI model may also include information related to branch pruning of the decision tree, parameter quantization, functions of the AI model, etc. Here, the functions of the AI model may also correspond to at least one of time-domain beam prediction, spatial-domain beam prediction, autoencoder for CSI feedback, autoencoder for beam management, etc.

[0153] The autoencoder for CSI feedback can also be used as follows:

[0154] · The UE sends the encoded bits output by inputting CSI / channel matrix / precoding matrix to the AI model of the encoder as CSI feedback (CSI report);

[0155] · The BS reconstructs the CSI / channel matrix / precoding matrix output by inputting the received encoded bits to the AI model of the decoder.

[0156] In spatial domain beam prediction, the UE / BS can also input measurement results (beam quality, e.g., RSRP) of sparse (or coarse) beams to the AI model and output dense (or fine) beam quality.

[0157] In time domain beam prediction, the UE / BS can also input time series (past, current, etc.) measurement results (beam quality, e.g., RSRP) to the AI model and output future beam quality.

[0158] The performance information related to the above AI model can also include information related to the expected value of the loss function defined for the AI model.

[0159] The AI model information in this disclosure can also include information related to the application scope (applicable scope) of the AI model. This application scope can also be represented by a physical cell ID, a serving cell index, etc. The information related to the application scope can also be included in the above environmental information.

[0160] The AI model information related to a specific AI model can be either predefined in the standard or notified to the UE from the network (Network (NW)). The AI model predefined in the standard can also be called a reference AI model. The AI model information related to the reference AI model can also be called reference AI model information.

[0161] In addition, the AI model information in this disclosure can also include an index for determining the AI model (e.g., it can also be called an AI model index, an AI model ID, a model ID, etc.). The AI model information in this disclosure can also include the AI model index based on / in place of the information such as the input / output information of the above AI model. The association between the AI model index and the AI model information (e.g., the input / output information of the AI model) can be either predefined in the standard or notified to the UE from the NW.

[0162] The AI model information in this disclosure can also be called AI model relevant information, abbreviated as relevant information, etc. In the AI model relevant information, the information for determining the AI model may not be explicitly included. The AI model relevant information can also be, for example, information that only includes meta information.

[0163] (AI-based CSI feedback)

[0164] As a representative sub-use case, the spatial domain-frequency domain CSI compression based on a two-sided AI model is being studied.

[0165] Figure 4This is a diagram showing an example of AI-based CSI feedback. The UE preprocesses measurement results related to CSI, etc., generates CSI based on AI / ML, performs post-processing, and sends the encoded bits (CSI feedback information) to the NW (base station). The NW (base station) preprocesses the received bits, reconstructs the CSI based on AI / ML, performs post-processing, and obtains the CSI (channel / precoding matrix).

[0166] <CSI Reconstruction in UE>

[0167] Figure 5 This is a diagram showing an example of the processing when the UE has a decoder. When the UE has the same decoder as the decoder in the base station, it can utilize the reconstructed CSI in pre-processing. Additionally, in pre-processing, for example, the svd+IDFT transform can also be used. The UE can monitor the accuracy of the model by comparing the target CSI (CSI (W, H) without errors caused by CSI compression) with the reconstructed CSI (W’, H’) as Figure 5 shown. The UE can report rank information and channel quality indication information based on the reconstructed CSI.

[0168] However, there are two issues in CSI reconstruction in the UE.

[0169] (1) The UE processing for CSI reconstruction is added, and in addition to the generation model (encoder), model storage for the reconstruction model (decoder) is also required.

[0170] (2) The issue of intellectual property rights. The base station (gNB) vendor considers the model information as its own intellectual property and may not wish to disclose the model information of previous generations to the UE vendor.

[0171] The UE can use a proxy model instead of the reconstruction model actually used by the base station to calculate the expected reconstructed CSI. The proxy model is a model that mimics the reconstruction model used by the base station. The proxy model can be a simple model. Thus, the processing and storage problems of the UE (the above (1)) can be alleviated. The proxy model can also be different from the actual reconstruction model in the base station. Thus, the problem of uniqueness (the above (2)) can be avoided.

[0172] Figure 6This is a diagram showing an example of CSI reconstruction (quasi-reconstruction) using a surrogate model. The UE receives the surrogate model for decoding from the NW (base station). The UE uses this surrogate model to reconstruct the encoded CSI and outputs it as the estimated result of the CSI. The UE maps the estimated result to the actual CSI and calculates the KPI (Key Performance Indicator) (e.g., SGCS (squared generalized cosine similarity)). As Figure 5 In the example of, there is a strong correlation between the KPI (SGCS) when using an actual decoder and the KPI (SGCS) when using a surrogate model.

[0173] (Analysis)

[0174] As described above, regarding future wireless communication technologies, research is being conducted on the flexible use of AI technologies for improving CSI feedback, such as reducing overhead, improving accuracy, prediction, etc. However, research on the specific content of AI-assisted CSI feedback has not progressed. For example, it is not clear about the processing when the UE does not have a reconstruction model, the determination of the rank, the reporting to the base station, etc.

[0175] If these are not properly specified, there is a concern that appropriate CSI feedback using AI cannot be performed. As a result, there is a concern that appropriate overhead reduction / high-precision channel estimation / high-efficiency resource utilization cannot be achieved, and the improvement of communication throughput / communication quality is suppressed.

[0176] Therefore, the inventors of the present invention have conceived of a terminal that can achieve appropriate CSI feedback using AI.

[0177] Hereinafter, with reference to the drawings, embodiments of the present disclosure will be described in detail. The wireless communication methods according to the respective embodiments can be applied separately or in combination.

[0178] In the present disclosure, "A / B" and "at least one of A and B" can also be rewritten with each other. Further, in the present disclosure, "A / B / C" can also mean "at least one of A, B, and C".

[0179] In the present disclosure, notification, activation, deactivation, indication (or specify), selection, configuration, update, determination, etc. can also be rewritten with each other. In the present disclosure, support, control, be able to control, operate, be able to operate, etc. can also be rewritten with each other.

[0180] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, Information Elements (IEs), settings, etc. can also be rewritten with each other. In the present disclosure, Medium Access Control control elements (MAC Control Elements (MAC CEs)), update commands, activation / deactivation commands, etc. can also be rewritten with each other.

[0181] In the present disclosure, higher layer signaling can also be any one of, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0182] In the present disclosure, MAC signaling can also use, for example, MAC Control Elements (MAC CEs), MAC Protocol Data Units (MAC PDUs), etc. Broadcast information can also be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0183] In the present disclosure, physical layer signaling can also be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), etc.

[0184] In the present disclosure, indexes, identifiers (Identifiers (IDs)), indicators, resource IDs, etc. can also be rewritten with each other. In the present disclosure, sequences, lists, sets, groups, clusters, subsets, etc. can also be rewritten with each other.

[0185] In addition, in the present disclosure, an encoder, encoding, encode, modification / change / control based on the encoder, etc. can also be rewritten with each other. In addition, in the present disclosure, a decoder, decoding, decode, modification / change / control based on the decoder, etc. can also be rewritten with each other.

[0186] In the present disclosure, UCI, CSI report, CSI feedback, feedback information, feedback bits, etc. can also be rewritten with each other. In addition, in the present disclosure, bits, bit strings, bit sequences, sequences, values, information, values obtained from bits, information obtained from bits, etc. can also be rewritten with each other.

[0187] In the present disclosure, a layer (regarding the encoder) can also be rewritten with a layer (input layer, intermediate layer, etc.) used in an AI model. A layer in the present disclosure can also correspond to at least one of an input layer, an intermediate layer, an output layer, a batch normalization layer, a convolutional layer, a dropout layer, a fully connected layer, etc.

[0188] In the present disclosure, a layer regarding a precoding matrix can also be rewritten with a multi-input multi-output (MIMO) layer, a stream, etc.

[0189] In the following embodiments, an AI model related to communication between a UE and a BS is described, so the associated entities are the UE and the BS, but the application of each embodiment of the present disclosure is not limited thereto. For example, regarding communication between other entities (e.g., communication between UEs), the UE and the BS in the following embodiments can also be rewritten as a first UE and a second UE. In other words, the UE, BS, etc. in the present disclosure can all be rewritten as arbitrary UEs / BSs.

[0190] In the present disclosure, a layer, a rank, RI, rank information, rank value can also be rewritten with each other. A network (NW), a base station, a gNB can also be rewritten with each other. In the present disclosure, an input, input information can also be rewritten with each other. In the present disclosure, conceive, expect can also be rewritten with each other.

[0191] In the present disclosure, CSI, channel matrix (H), precoding matrix can also be rewritten with each other. In the present disclosure, quasi-reconstruction, reconstruction, compression can also be rewritten with each other. Quasi-reconstruction can also mean reconstruction based on a model (proxy model) that mimics a reconstruction model. CSI compression can also mean CSI generation and CSI reconstruction. A model, an AI model, an AI / ML model, a reconstruction model, a proxy model, a decoder can also be rewritten with each other.

[0192] (Wireless communication method)

[0193] <First Embodiment>

[0194] The UE can also send (report) the following capability information (UE capability information) to the base station (gNB). The UE can also perform processing corresponding to the capability information.

[0195] (1) Whether the UE can calculate the reconstructed CSI corresponding to the CSI reconstructed by the base station, that is, whether the UE can apply the reconstruction model in the base station.

[0196] (2) Whether the UE can calculate the quasi-reconstructed CSI (expected reconstructed CSI) corresponding to the CSI reconstructed by the base station, that is, whether the model (surrogate model) that mimics the reconstruction model is available.

[0197] (3) Whether the UE can calculate the quasi-reconstructed CSI corresponding to the CSI reconstructed by the base station. Whether the quasi-reconstruction model is available.

[0198] (4) The UE can also report the model information of the model that reconstructs the quasi-reconstructed CSI.

[0199] (5) The UE can also report the model information of the model mimicked by the surrogate model. The model information is the information of the model that generates the data set used in the learning of the surrogate model.

[0200] (6) The UE can also report information on the similarity between the surrogate model and the model mimicked by the surrogate model (e.g., KPI, SGCS).

[0201] The UE can also report the above capabilities with the following fine granularity.

[0202] (1) The UE can also report the above capabilities for calculating the performance of CSI accuracy (performance of CSI compression) (for each CSI accuracy).

[0203] (2) The UE can also report the above capabilities for calculating the rank information (for each rank information).

[0204] (3) The UE can also report the above capabilities for calculating the channel quality indication (for each channel quality indication).

[0205] In addition, the above-mentioned specific UE capabilities can be capabilities applied across all frequencies (commonly regardless of frequency), or capabilities for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or capabilities for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities for each SubCarrier Spacing (SCS), or also capabilities for each Feature Set (FS) or each Feature SetPer Component-carrier (FSPC) of each component carrier.

[0206] <Summary of CSI report using AI>

[0207] Figure 7 It is a diagram showing the summary of the CSI report. The UE performs channel measurements on the received CSI-RS and calculates the CRI. The UE can also assume the LI, CQI, PMI, RI dependencies among the CSI parameters (when reported) to calculate the CSI parameters. For example, LI is calculated based on the reported CQI, PMI, RI, and CRI. CQI is calculated based on the reported PMI, RI, and CRI. PMI is calculated based on the reported RI and CRI. RI is calculated based on the reported CRI.

[0208] <Determination of RI>

[0209] The Rank Indicator (RI) can also be included in the CSI report. When RI represents X, the PMI can also represent the CSI information of layer X. Depending on RI, the bit width / interpretation of UCI can also be different. Depending on RI, the number of layers of the precoding matrix indicated by PMI is different.

[0210] The possible RI values are determined according to the RRC parameters (ri-Restriction, typeII-RI-Restriction) and the type of the CSI codebook. The codebook type can also determine the maximum RI value without limitation. The RRC parameters can also restrict the RI values.

[0211] [Type I codebook]

[0212] The bitmap parameter ri-Restriction forms a bit string r3,...r1,r0. r0 is the LSB and r3 is the MSB. When r1 is 0, the reporting of PMI and RI is not allowed to correspond to any precoder associated with layer v = i + 1.

[0213] [Type II codebook]

[0214] When the UE sets the high-layer parameter codebookType to 'typeII', the bitmap parameter typeII-RI-Restriction forms a bit string r1,r0. r0 is the LSB and r1 is the MSB. When r1 is 0 and i is 0 or 1, the reporting of PMI and RI is not allowed to correspond to any precoder associated with layer v = i + 1. The bitmap parameter n1-n2-codebookSubsetRestriction forms a bit string B = B1B2. B is formed by concatenating the bit strings B1 and B2.

[0215] [Extended type II codebook]

[0216] The UE reports the RI value v that follows the set high-layer parameter typeII-RI-Restriction-r16. The UE does not report v > 4. The bitmap parameter typeII-RI-Restriction-r16 forms a bit string r3,r2,r1,r0 with r0 as the LSB and r3 as the MSB. When r i is 0, for any i from 0 to 3, the reporting of PMI and RI is not allowed to correspond to any precoder associated with layer v = i + 1.

[0217] [Second Embodiment]

[0218] [Method 2.1]

[0219] When the channel matrix (H), or the preprocessed / quantized H (p-H, Q-H, Qp-H) is selected as the input to the AI / ML model, the UE can either send the RI information (rank information) corresponding to this input or not send it.

[0220] Figure 8 is a diagram showing an application example of the preprocessed H. In Figure 8 the UE inputs the preprocessed H obtained by preprocessing H a into the AI / ML model and obtains the encoded bits. The rank R a corresponding to this H a is equivalent to the RI of this embodiment.

[0221] [Option 1]

[0222] The UE may also send an RI (= R a ) message. The UE may also send the RI message in the same way as in the existing specifications. The UE may also compress and send the RI message together with H a (or pre-processed / quantized H a ).

[0223] [Option 2]

[0224] The UE may also not send an RI (= R a ) message. In this case, the NW (base station) may also infer the RI message based on the input and output of the AI / ML model, or the selected / reported AI / ML model information, or the payload size of the reported AI-based CSI feedback.

[0225] According to this embodiment, the presence or absence of information about RI becomes clear. By compressing the RI message or omitting the transmission, the communication capacity can be reduced.

[0226] [Method 2.2]

[0227] The UE may also send (report) rank information (rank value) corresponding to at least one of the reconstructed or quasi-reconstructed CSI (precoding matrix) and the encoded information in the CSI report. The rank information (e.g., rank value) represents the number of layers of the reconstructed CSI indicated by the encoded bits. When the UE can appropriately determine the rank, it is desirable for the UE to report only the information associated with the rank value and the reconstructed precoding matrix corresponding to the rank value, and as a result, the overhead is reduced. The transmitted rank value may also be, for example, a rank value determined by any of the following options.

[0228] [Option 1]

[0229] The UE may also determine the rank value based on the precoding matrix derived from the reconstructed CSI (e.g., the reconstructed precoding matrix). The rank value may also be calculated conditional on at least one of the reconstructed CSI and the reported CRI.

[0230] [Option 2]

[0231] The UE may also determine the rank value based on the precoding matrix derived from the quasi-reconstructed CSI (e.g., the quasi-reconstructed precoding matrix). The rank value is calculated conditional on at least one of the quasi-reconstructed CSI and the reported CRI.

[0232] [Option 3]

[0233] The UE can also determine the rank value based on the monitored / calculated / empirical / expected system performance (e.g., Block Error Rate (BLER), RSRP, SINR, or virtual BLER, RSRP, SINR). The rank value is calculated conditional on at least one of the monitored / calculated / empirical / anticipated system performance and the reported CRI.

[0234] [Option 4]

[0235] The UE can also determine the recommended rank value based on the monitored / calculated performance of the model. The rank value is calculated conditional on the monitored / calculated performance of the model and the reported CRI.

[0236] [Option 5]

[0237] The UE can also determine the rank value based on the target CSI. The target CSI is the CSI without errors due to CSI generation and CSI reconstruction (CSI compression). The target CSI can also mean the CSI calculated based on UE measurements, the ideal CSI (simulation-based CSI, fixed value), or the actual CSI. As Figure 9 shown, the target CSI can also be, for example, the result of post-processing the CSI calculated based on UE measurements. As Figure 9 shown, for the target CSI, the intermediate KPI can also be calculated together with the CSI (output CSI) generated using the AI / ML model.

[0238] The appropriate rank of the reconstructed CSI is expected to be lower than the rank of the target CSI. Therefore, the rank value of the target CSI can also be applied as the maximum rank of the reconstructed precoding matrix (CSI), which is useful for rank determination of the PDSCH. The rank value is calculated conditional on at least one of the target CSI and the reported CRI.

[0239] The UE can also determine the rank value based on the precoding matrix assuming the application of a specific CSI codebook (e.g., Type I codebook, Type II codebook). The specific CSI codebook can be specified by the NW from the information sent by using any of the following [Notification of Information to the UE] methods, or can be specified in the specification. The UE can also calculate the rank value based on the precoding matrix assuming a specific CSI codebook and at least one of the reported CRI.

[0240] [Supplement]

[0241] Among the options, the UE can also determine a rank value from specific rank values within the range restricted by RRC parameters (e.g., a bitmap parameter corresponding to the allowed rank value / maximum allowed rank value). Among the options, the UE can also report the coded bits of N layers representing the reconstructed CSI (e.g., the reconstructed precoding matrix). N is the reported rank value.

[0242] <Determination of RI>

[0243] In the case where the reconstructed CSI cannot be utilized, the UE may not be able to appropriately determine the rank value of the reported reconstructed precoding matrix. In this case, the following (1) and (2) can also be applied instead of determining the rank value of the reported reconstructed CSI.

[0244] (1) The UE can also report the coded bits representing the full rank of the reconstructed CSI (e.g., the reconstructed precoding matrix).

[0245] (2) The UE reports the coded bits representing a specific rank of the reconstructed CSI (e.g., the reconstructed precoding matrix). For example, Option 4 in the third embodiment or Method 2.2 is applied.

[0246] In the case where the reconstructed CSI cannot be utilized, the UE can also report the recommended rank value when applying the precoding matrix obtained from the coded and reported bits. For example, the fourth embodiment can also be applied.

[0247] In the case where the reconstructed CSI cannot be utilized, the UE can also, after reporting the coded bits, receive the RS precoded by the reported reconstructed precoding matrix and report the rank value and the channel quality indicator based on the UE's measurement. For example, the fifth embodiment can also be applied.

[0248] <Third Embodiment>

[0249] The UE can also send (report) (can also control the sending) the information (coded bits) representing a specific number of layers (rank) corresponding to the reconstructed CSI (e.g., the reconstructed precoding matrix) corresponding to the channel state information (CSI) reconstructed by the base station.

[0250] [Option 1]

[0251] The specific number of layers (rank) can also be determined by the specification. For example, the UE can always report all available ranks (all rank values).

[0252] [Option 2]

[0253] The UE can also determine the number of layers (rank) based on the information related to the layer (rank) received from the NW (base station) by the method of [Notification of Information to the UE] described later.

[0254] [Option 3]

[0255] The UE may also send UE capability information indicating the number of layers (rank), and the number of layers (rank) is determined based on this UE capability information.

[0256] [Option 4]

[0257] The CSI that is reconstructed without error through CSI generation and CSI reconstruction (CSI compression) may also be used as the target CSI, and the target number of layers (rank) is determined based on this target CSI. This process corresponds to Option 4 of Method 2.2.

[0258] [Option 5]

[0259] At least two of Options 1 to 4 may also be combined.

[0260] [Fourth Embodiment]

[0261] The UE may also send (report) a recommended rank (number of layers) value for PDSCH transmission that assumes a precoding matrix (reconstructed precoding matrix) derived through CSI reconstruction or quasi-CSI reconstruction. The NW (base station) may also determine the rank value to be used based on the sent recommended rank value and send (notify) the determined rank value (information related to the rank) to the UE. That is, Option 2 of the third embodiment may also be combined with this embodiment.

[0262] [Option 1]

[0263] The UE may also determine the recommended rank value based on the quasi-reconstructed CSI (e.g., the quasi-reconstructed precoding matrix). The rank value may also be calculated based on at least one of the quasi-reconstructed CSI and the reported CRI.

[0264] [Option 2]

[0265] The UE may also determine the recommended rank value based on the monitored / calculated performance of the model.

[0266] [Option 3]

[0267] The UE may also determine the recommended rank value based on the monitored / calculated / empirical / expected system performance (e.g., BLER, RSRP, SINR, or virtual BLER, RSRP, SINR).

[0268] [Option 4]

[0269] The UE may also determine the recommended rank value based on the target CSI, which is the CSI reconstructed without errors due to CSI generation and CSI reconstruction (CSI compression).

[0270] The recommended rank value in this embodiment can also be, for example, (1) or (2) below.

[0271] (1) The rank value recommended / requested by the UE to the base station (gNB) for PDSCH transmission.

[0272] (2) The maximum rank value recommended / requested by the UE to the base station (gNB) for PDSCH transmission.

[0273] When applying the third embodiment, the UE can also assume (expect) to apply or be able to apply the third embodiment.

[0274] <cri-ri-cqi>

[0275] The processing of the UE when the high-layer parameter report quantity (reportQuantity) included in the CSI report setting (CSI-ReportConfig) is set to 'cri-RI-i1-CQI' is described.

[0276] When the UE is not set with the high-layer parameter non-PMI-PortIndication, for each CSI-RS resource set for the CSI resource associated with the CSI-ReportConfig, the UE assumes the CSI-RS port index P0 (v) ,...,P v-1 (v) ={0,...v-1} is associated with the rank v = 1, 2,..., P, and P (any one of 1, 2, 3, 4) is the number of ports within the CSI-RS resource.

[0277] Figure 10 is a diagram showing RI, LI, CQI, and CRI in the case of codebookType = typeI-SinglePanel in Rel.17 or when'reportQuantity' is set to 'cri-RI-CQI'. As Figure 10 shown, the bandwidths for RI, LI, CQI, and CRI are set to different values according to the antenna port and the rank.

[0278] <Fifth Embodiment>

[0279] [Method 5.1]

[0280] Figure 11 is a diagram showing the outline of Method 5.1. The UE can also receive the RS (CSI-RS) used to obtain the precoding matrix by reconstructing the CSI after reporting the information associated with the precoding matrix (CSI) (for example, the encoded bits). In addition, the UE can also send (report) at least one of CRI, CQI, and RI corresponding to the RS after reporting the information associated with the precoding matrix. In this case, the UE can also assume that the CSI report is triggered by DCI. The type II codebook is sent through the PUSCH. After the CSI report in the PUSCH, the UE can also receive the precoded RS.

[0281] [Method 5.2]

[0282] When the UE reports the encoded bits, when it is configured to report, or when it is instructed to report, it can also be assumed (expected) that the higher layer parameter reportQuantity is configured as CRI / RI / CQI and is configured to perform CSI reporting. In this case, the following (1) to (3) can also be applied.

[0283] (1) The UE can assume that the number of CSI-RS resources in the corresponding resource set is 1. In the type II codebook, the number of CSI-RS resources is 1.

[0284] (2) The UE can assume that the CSI report is triggered by DCI. The type II codebook is transmitted via PUSCH. After the CSI report is performed in the PUSCH, the UE can also receive the precoded RS.

[0285] (3) The UE can also assume that the configured number of ports of the CSI-RS resource is the same as the number of ports in the CSI report when the higher layer parameter reportQuantity is configured as "CRI / RI / CQI" and the number of ports in the CSI report of the encoded bits. When applying the third embodiment, the UE can also assume to apply or be able to apply the fifth embodiment.

[0286] <Supplement>

[0287] [Notification of Information to the UE]

[0288] The notification of any information in the above embodiments (from the network (Network (NW)) (e.g., the base station (BaseStation (BS)))) to the UE (in other words, the reception of any information from the BS in the UE) can also be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PDCCH, PDSCH, reference signals), or a combination thereof.

[0289] When the above notification is performed via MAC CE, the MAC CE can also be identified by being included in the MAC subheader with a new logical channel ID (Logical Channel ID (LCID)) not specified in the existing standards.

[0290] When the above notification is carried out by DCI, the above notification can also be carried out by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used in scrambling of Cyclic Redundancy Check (CRC) bits assigned to the DCI, a format of the DCI, etc.

[0291] In addition, the notification of any information in the above embodiments to the UE can also be carried out periodically, semi - persistently or aperiodically.

[0292] [Notification of Information from UE]

[0293] The notification of any information from the UE (to the NW) in the above embodiments (in other words, the transmission / reporting of any information in the UE to the BS) can also be carried out using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals) or a combination thereof.

[0294] When the above notification is carried out by MAC CE, the MAC CE can also be identified by being included in the MAC sub - header with a new LCID not specified in the existing standards.

[0295] When the above notification is carried out by UCI, the above notification can also be sent using PUCCH or PUSCH.

[0296] In addition, the notification of any information from the UE in the above embodiments can also be carried out periodically, semi - persistently or aperiodically.

[0297] [Application of Each Embodiment]

[0298] At least one of the above embodiments can also be applied to a case that satisfies specific conditions. The specific conditions can either be specified in the standard or be notified to the UE / BS using higher layer signaling / physical layer signaling.

[0299] At least one of the above embodiments can also be applied only to a UE that has reported a specific UE capability or supports the specific UE capability.

[0300] The specific UE capability can also represent support for specific processing / operation / control / information regarding at least one of the above embodiments / methods / options

[0301] In addition, the above-mentioned specific UE capabilities can be either capabilities applied across all frequencies (commonly regardless of frequency), or capabilities for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or capabilities for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities for each SubCarrier Spacing (SCS), or capabilities for each Feature Set (FS) or each Feature Set Per Component-carrier (FSPC).

[0302] In addition, the above-mentioned specific UE capabilities can be either capabilities applied across all duplex modes (commonly regardless of the duplex mode), or capabilities for each duplex mode (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0303] In addition, at least one of the above-mentioned embodiments can also be applied to the following situation: The UE is set / activated / triggered by high-layer signaling / physical-layer signaling with specific information associated with the above-mentioned embodiments (or operates to implement the above-mentioned embodiments). For example, the specific information can also be any RRC parameters, etc., for a specific version (e.g., Rel.18 / 19).

[0304] In the case where the UE does not support at least one of the above-mentioned specific UE capabilities or is not set with the above-mentioned specific information, the UE can also apply the operations of Rel.15 / 16, for example.

[0305] (Supplementary Note)

[0306] Regarding an embodiment of the present disclosure, the following invention is noted.

[0307] [Supplementary Note 1]

[0308] A terminal, comprising:

[0309] a transmitting unit that transmits capability information indicating whether it is capable of calculating a reconstructed CSI or a quasi-reconstructed CSI corresponding to a channel state information (CSI) reconstructed with a base station; and

[0310] a control unit that calculates the reconstructed CSI or the quasi-reconstructed CSI.

[0311] [Supplementary Note 2]

[0312] The terminal as described in Supplementary Note 1, wherein,

[0313] The sending unit sends a rank value corresponding to at least one of the following: the reconstructed CSI or the quasi-reconstructed CSI; and the encoded information in the CSI report.

[0314] [Supplementary Note 3]

[0315] The terminal as described in Supplementary Note 1 or Supplementary Note 2, wherein,

[0316] The control unit determines the rank value based on the expected system performance.

[0317] [Supplementary Note 4]

[0318] The terminal as described in any one of Supplementary Notes 1 to 3, wherein,

[0319] The control unit determines the rank value based on the actual CSI.

[0320] Regarding an embodiment of the present disclosure, the following invention is also appended.

[0321] [Supplementary Note 1]

[0322] A terminal having:

[0323] A receiving unit that receives information related to rank; and

[0324] A control unit that controls the transmission of a specific rank corresponding to the reconstructed CSI corresponding to the channel state information (CSI) reconstructed with the base station.

[0325] [Supplementary Note 2]

[0326] The terminal as described in Supplementary Note 1, wherein,

[0327] The terminal further has a sending unit that sends a recommended rank value for the physical downlink shared channel (PDSCH) transmission of a precoding matrix assumed to be derived from the reconstructed CSI or the quasi-reconstructed CSI,

[0328] The receiving unit receives the information related to rank determined based on the recommended rank value.

[0329] [Supplementary Note 3]

[0330] The terminal as described in Supplementary Note 1 or Supplementary Note 2, wherein,

[0331] The terminal further has a sending unit that sends information associated with the precoding matrix,

[0332] The receiving unit receives a reference signal of a precoding matrix that is used to obtain the reconstructed CSI or the quasi-reconstructed CSI.

[0333] [Appendix 4]

[0334] The terminal according to Appendix 3, wherein

[0335] The transmitting unit transmits at least one of a channel state information reference signal resource indicator (CRI), a channel quality indicator (CQI), and a rank indicator (RI) corresponding to the reference signal.

[0336] (Wireless communication system)

[0337] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, any one or a combination of the above-described wireless communication methods according to the various embodiments of the present disclosure is used for communication.

[0338] Figure 12 is a diagram showing an example of a schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 (which may also be abbreviated as system 1) may also be a system that realizes communication by using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5GNR), or the like.

[0339] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0340] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (MN), and the base station (gNB) of NR is the secondary node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0341] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR dual connectivity (NN-DC)) where both the MN and the SN are base stations (gNBs) of NR).

[0342] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is configured within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, number, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0343] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of carrier aggregation (CA) and dual connectivity (DC) that uses multiple component carriers (CCs).

[0344] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may correspond to a frequency band higher than FR2.

[0345] Furthermore, the user terminal 20 may also communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0346] Multiple base stations 10 can also be connected via wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is utilized as a backhaul between base stations 11 and 12, the base station 11, which is equivalent to the upper station, can also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12, which is equivalent to a relay station (relay), can also be referred to as an IAB node.

[0347] The base station 10 can also be connected to the core network 30 via other base stations 10 or directly. The core network 30 can also include, for example, at least one of an Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0348] The core network 30 can also include, for example, network functions (NF) such as User Plane Function (UPF), Access and Mobility management Function (AMF), Session Management Function (SMF), Unified Data Management (UDM), Application Function (AF), Data Network (DN), Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). Additionally, multiple functions can be provided by one network node. Furthermore, communication with an external network (e.g., the Internet) can be carried out via the DN.

[0349] The user terminal 20 can also be a terminal that supports at least one of communication methods such as LTE, LTE-A, 5G, etc.

[0350] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also be utilized. For example, in at least one of the Downlink (DL) and the Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. can also be used.

[0351] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, in the wireless access methods of the UL and the DL, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used.

[0352] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. that are shared among the respective user terminals 20 can also be used.

[0353] Furthermore, as an uplink channel, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. that are shared among the respective user terminals 20 can also be used.

[0354] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through the PDSCH. User data, high-layer control information, etc. can also be transmitted through the PUSCH. In addition, the Master Information Block (MIB) can also be transmitted through the PBCH.

[0355] Low-layer control information can also be transmitted through the PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information of at least one of the PDSCH and the PUSCH.

[0356] In addition, the DCI for scheduling the PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH can also be rewritten as DL data, and the PUSCH can also be rewritten as UL data.

[0357] In the detection of the PDCCH, the Control Resource SET (CORESET) and the search space can also be utilized. The CORESET corresponds to the resource for searching for DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0358] One search space can also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure can also be rewritten with each other.

[0359] Through the PUCCH, it is also possible to transmit uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (which can also be referred to as Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)). Through the PRACH, it is also possible to transmit a random access preamble for establishing a connection with a cell.

[0360] In addition, in the present disclosure, the downlink, uplink, etc. can also be expressed in a way without "link". Furthermore, it can also be expressed in a way without "Physical" at the beginning of various channels.

[0361] In the wireless communication system 1, it is also possible to transmit a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. As the DL-RS, in the wireless communication system 1, it is also possible to transmit a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc.

[0362] The synchronization signal can be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. can also be referred to as reference signals.

[0363] In addition, in the wireless communication system 1, as the uplink reference signal (UL-RS), it is also possible to transmit a reference signal for measurement (sounding reference signal (SRS)), a demodulation reference signal (DMRS), etc. In addition, the DMRS can also be referred to as a user terminal specific reference signal (UE-specific Reference Signal).

[0364] (Base station)

[0365] Figure 13 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0366] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the base station 10 further has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0367] The control unit 110 implements overall control of the base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0368] The control unit 110 can also control the generation, scheduling (e.g., resource allocation, mapping), etc. of signals. The control unit 110 can also control the transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 can also generate data, control information, a sequence, etc. to be transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0369] The transmission and reception unit 120 may also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission and reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission and reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0370] The transmission and reception unit 120 may be configured as an integrated transmission and reception unit or may be composed of a transmission unit and a reception unit. The transmission unit may also be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may also be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0371] The transmission and reception antenna 130 can be composed of an antenna, such as an array antenna, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0372] The transmission and reception unit 120 may also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission and reception unit 120 may also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0373] The transmission and reception unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0374] The transmission and reception unit 120 (transmission processing unit 1211) may also perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0375] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing (filtering), Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0376] The transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing (filtering), amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0377] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing (filtering), demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0378] The transmission / reception unit 120 (reception processing unit 1212) can also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing (filtering), demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0379] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0380] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30 (e.g., the network node providing the NF), other base stations 10, etc., and obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0381] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0382] In addition, the transmission / reception unit 120 may also receive capability information indicating whether it is possible to calculate the reconstructed CSI or pseudo-reconstructed CSI corresponding to the channel state information (CSI) reconstructed by the base station.

[0383] The control unit 110 may also assume that the reconstructed CSI or pseudo-reconstructed CSI is calculated in the terminal.

[0384] The transmission / reception unit 120 may also transmit information related to the rank.

[0385] The control unit 110 may also control the reception of a specific rank corresponding to the reconstructed CSI or pseudo-reconstructed CSI corresponding to the channel state information (CSI) reconstructed by the base station.

[0386] (User Terminal)

[0387] Figure 14 This is a diagram showing an example of the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. Additionally, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0388] Furthermore, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the user terminal 20 further has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0389] The control unit 210 implements the overall control of the user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to this disclosure.

[0390] The control unit 210 may also control the generation, mapping, etc. of signals. The control unit 210 may also control the transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission / reception unit 220.

[0391] The transmission / reception unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. described based on the common knowledge in the technical field related to this disclosure.

[0392] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit may be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0393] The transmission / reception antenna 230 can be composed of an antenna described based on the common knowledge in the technical field related to this disclosure, such as an array antenna, etc.

[0394] The transmission / reception unit 220 may also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 may also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0395] The transmission / reception unit 220 may also form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0396] The transmission / reception unit 220 (transmission processing unit 2211) may also perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0397] The transmission / reception unit 220 (transmission processing unit 2211) may also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing (filtering), DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0398] In addition, regarding whether to apply DFT processing, it may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. Otherwise, the transmission / reception unit 220 (transmission processing unit 2211) may not perform DFT processing as the above-mentioned transmission processing.

[0399] The transmission / reception unit 220 (RF unit 222) may also perform modulation to a radio frequency band, filter processing (filtering), amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0400] On the other hand, the transmission / reception unit 220 (RF unit 222) may also perform amplification, filter processing (filtering), demodulation to a baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 230.

[0401] The transmission / reception unit 220 (reception processing unit 2212) may also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing (filtering), demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the obtained baseband signal, and obtain user data, etc.

[0402] The transmission / reception unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may also perform measurements on received power (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0403] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0404] In addition, the transmission / reception unit 220 may also transmit capability information indicating whether it is possible to calculate reconstructed CSI or pseudo-reconstructed CSI corresponding to the channel state information (CSI) reconstructed with the base station.

[0405] The control unit 210 may also calculate the reconstructed CSI or the pseudo-reconstructed CSI.

[0406] The transmission / reception unit 220 may also transmit a rank value corresponding to at least one of the following: the reconstructed CSI or the quasi-reconstructed CSI; and the encoded information in the CSI report.

[0407] The control unit 210 may also determine the rank value based on the expected system performance.

[0408] The control unit 210 may also determine the rank value based on the actual CSI.

[0409] In addition, the transmission / reception unit 220 may also receive information related to the rank.

[0410] The control unit 210 may also control the transmission of a specific rank corresponding to the reconstructed CSI or the quasi-reconstructed CSI corresponding to the channel state information (CSI) reconstructed with the base station.

[0411] The transmission / reception unit 220 may also transmit a recommended rank value for the physical downlink shared channel (PDSCH) transmission assuming a precoding matrix derived from the reconstructed CSI or the quasi-reconstructed CSI. The transmission / reception unit 220 may also receive the information related to the rank determined based on the recommended rank value.

[0412] The transmission / reception unit 220 may also transmit information associated with the precoding matrix. The transmission / reception unit 220 may also receive a reference signal for the precoding matrix obtained through the reconstructed CSI or the quasi-reconstructed CSI.

[0413] The transmitting and receiving unit 220 may also transmit at least one of a channel state information reference signal resource indicator (CRI), a channel quality indicator (CQI), and a rank indicator (RI) corresponding to the reference signal.

[0414] (Hardware Structure)

[0415] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, there is no particular limitation on the implementation method of each functional block. That is, each functional block may be implemented by a single device physically or logically combined, or may be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected by these multiple devices. The functional block may also be implemented by combining the above single device or the above multiple devices with software.

[0416] Here, among the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notification, communication, forwarding, constitution (configuration), reconstitution (re - configuration), allocation, mapping, assignment, etc., but not limited to these. For example, a functional block (structural unit) that implements the transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and its implementation method is not particularly limited.

[0417] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may also function as a computer that processes the wireless communication method of the present disclosure. Figure 15 FIG. is an example of a hardware structure of a base station and a user terminal according to an embodiment. The above - mentioned base station 10 and user terminal 20 may also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0418] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be rewritten with each other. The hardware structures of the base station 10 and the user terminal 20 can be configured to include one or more of each device shown in the figure, or can be configured not to include some devices.

[0419] For example, only one processor 1001 is illustrated, but there may be multiple processors. In addition, the processing can be executed by one processor, or can be executed by two or more processors simultaneously, sequentially, or by other means. Additionally, the processor 1001 can also be implemented by one or more chips.

[0420] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage device 1003, thereby implementing the function.

[0421] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 can also be composed of a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. can also be implemented by the processor 1001.

[0422] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage device 1003 and the communication device 1004 into the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same can be applied to other functional blocks.

[0423] The memory 1002 may also be a computer-readable recording medium, which is constituted by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. that can be executed to implement the wireless communication method according to an embodiment of the present disclosure.

[0424] The storage 1003 may also be a computer-readable recording medium, which is constituted by at least one of, for example, a flexible disc, a floppy (registered trademark) disc, an optical disc (such as a compact disc (compact disc read-only memory (CD-ROM)), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0425] The communication device 1004 is hardware (a transmission / reception device) for performing inter-computer communication via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-described transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), etc. may also be implemented by the communication device 1004. The transmission / reception unit 120 (220) may also be physically or logically separated into a transmission unit 120a (220a) and a reception unit 120b (220b).

[0426] The input device 1005 is an input device that accepts input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be integrated (e.g., a touch panel).

[0427] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or may be constituted by different buses between the devices.

[0428] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA), and a part or all of the functional blocks may be implemented by this hardware. For example, the processor 1001 may also be implemented using at least one of these hardwares.

[0429] (Variant example)

[0430] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be rewritten with each other. In addition, a signal may be a message. A reference signal can also be abbreviated as RS and may also be referred to as a Pilot, a pilot signal, etc. according to the applied standard. In addition, a Component Carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0431] A radio frame may also be constituted by one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be constituted by one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of numerology.

[0432] Here, the parameter set may also be communication parameters applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filter processing (filtering process) performed by the transmitter-receiver in the frequency domain, specific windowing process performed by the transmitter-receiver in the time domain, etc.

[0433] In the time domain, a time slot may also be composed of one or more symbols (such as orthogonal frequency division multiplexing (OFDM) symbols, single carrier frequency division multiple access (SC-FDMA) symbols, etc.). In addition, a time slot may also be a time unit based on the parameter set.

[0434] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0435] A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol all represent time units for transmitting signals. A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol may also use their respective other names. In addition, the time units such as frames, sub-frames, time slots, mini-slots, symbols, etc. in this disclosure may also be rewritten with each other.

[0436] For example, a sub-frame may also be referred to as a TTI, multiple consecutive sub-frames may also be referred to as a TTI, a time slot or a mini-slot may also be referred to as a TTI. That is, at least one of a sub-frame and a TTI may be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may not be referred to as a sub-frame, but as a time slot, a mini-slot, etc.

[0437] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each user terminal) in units of TTI. Additionally, the definition of TTI is not limited to this.

[0438] The TTI can also be the transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have undergone channel coding, and can also serve as the processing unit for scheduling, link adaptation, etc. Additionally, when the TTI is given, the time interval (such as the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped can also be shorter than the TTI.

[0439] Furthermore, when one time slot or one mini - time slot is referred to as the TTI, one or more TTIs (i.e., one or more time slots or one or more mini - time slots) can also be the minimum time unit for scheduling. In addition, the number of time slots (mini - time slot numbers) that make up the minimum time unit of this scheduling can also be controlled.

[0440] The TTI with a time length of 1 ms can also be referred to as the normal TTI (TTI in 3GPP Rel.8 - 12), standard TTI, long TTI, normal sub - frame, standard sub - frame, long sub - frame, time slot, etc. The TTI shorter than the normal TTI can also be referred to as the shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened sub - frame, short sub - frame, mini - time slot, sub - time slot, time slot, etc.

[0441] In addition, the long TTI (such as the normal TTI, sub - frame, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and the short TTI (such as the shortened TTI, etc.) can also be rewritten as a TTI with a TTI length less than that of the long TTI and greater than or equal to 1 ms.

[0442] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and can also include one or more consecutive sub - carriers (subcarriers) in the frequency domain. The number of sub - carriers included in the RB can be the same regardless of the parameter set, for example, it can be 12. The number of sub - carriers included in the RB can also be determined based on the parameter set.

[0443] In addition, the RB can also include one or more symbols in the time domain, and can also be the length of one time slot, one mini - time slot, one sub - frame, or one TTI. One TTI, one sub - frame, etc. can also be composed of one or more resource blocks respectively.

[0444] In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0445] Furthermore, a resource block may also be composed of one or more Resource Elements (REs). For example, one RE may also be a wireless resource region of a sub-carrier and a symbol.

[0446] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the indexes of the RBs based on the common reference point of the carrier. A PRB may also be defined in a certain BWP and be additionally numbered within that BWP.

[0447] A BWP may also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may also be set within one carrier.

[0448] At least one of the set BWPs may also be active, and the UE may not assume to transmit and receive specific signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0449] In addition, the above structures such as radio frames, sub-frames, time slots, mini time slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of time slots in each sub-frame or radio frame, the number of mini time slots included in a time slot, the symbols and the number of RBs included in a time slot or mini time slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0450] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, may also be represented by relative values with respect to a specific value, and may also be represented by corresponding other information. For example, a radio resource may also be indicated by a specific index.

[0451] In the present disclosure, the names used for parameters and the like are not limiting names in all respects. Furthermore, mathematical expressions and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. Various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name. Therefore, the various names assigned to these various channels and information elements are not limiting names in all respects.

[0452] The information, signals, etc. described in the present disclosure can also be represented using any one of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0453] In addition, information, signals, etc. can be output in at least one of the following directions: from the higher layer (upper layer) to the lower layer (lower layer), and from the lower layer to the higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0454] The information, signals, etc. input and output can be stored in a specific location (e.g., a memory), or can be managed using a management table. The information, signals, etc. input and output can be overwritten, updated, or appended. The information, signals, etc. output can also be deleted. The information, signals, etc. input can also be sent to other devices.

[0455] The notification of information is not limited to the methods / embodiments described in the present disclosure, and other methods can also be used. For example, the notification of information in the present disclosure can also be implemented by physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0456] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection setup message, an RRC connection reconfiguration (RRC connection re-setting (RRC Connection Reconfiguration)) message, etc. In addition, MAC signaling may also be notified, for example, using a MAC control element (MAC Control Element (CE)).

[0457] In addition, the notification of specific information (e.g., the notification of "is X") is not limited to explicit notification and may also be performed implicitly (e.g., by not performing the notification of the specific information or by the notification of other information).

[0458] The determination can be made by a value represented by one bit (0 or 1), by a true / false value (Boolean value) represented by true or false, or by a numerical comparison (e.g., comparison with a specific value).

[0459] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, processes, functions, etc.

[0460] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of using at least one of wired technologies (coaxial cables, fiber optic cables, twisted pairs, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared rays, microwaves, etc.) to send software from a website, server, or other remote source, at least one of these wired technologies and wireless technologies is included in the definition of the transmission medium.

[0461] Terms such as "system" and "network" used in the present disclosure can be used interchangeably. A "network" can also mean a device (e.g., a base station) included in the network.

[0462] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0463] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. can be used interchangeably. There are also cases where base stations are referred to using terms such as macro cell, small cell, femto cell, pico cell, etc.

[0464] A base station can accommodate one or more (e.g., three) cells. In the case where the base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each of the smaller areas can also provide communication services through a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within this coverage range.

[0465] In the present disclosure, the situation where the base station sends information to the terminal can also be rewritten as the base station instructing the terminal to perform control / operation based on this information.

[0466] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0467] There are also cases where the mobile station is referred to as a subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0468] At least one of the base station and the mobile station can also be referred to as a transmitting device, receiving device, wireless communication device, etc. In addition, at least one of the base station and the mobile station can also be a device mounted on a moving object, the moving object itself, etc.

[0469] The mobile object refers to an object that can move, with an arbitrary moving speed, and of course, it also includes the case where the mobile object stops. The mobile object includes, for example, vehicles, transport vehicles, automobiles, motorized two-wheel vehicles (motorcycle), bicycles, connected vehicles, loading shovels, bulldozers, wheel loaders, dump trucks, fork lifts, trains, buses, trolleys, rickshaws, ships (boats and other watercraft), airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and objects mounted on them. In addition, it is not limited to these. Furthermore, the mobile object can also be a mobile object that autonomously travels based on an operation instruction.

[0470] The mobile object can be either a means of transportation (e.g., vehicles, airplanes, etc.), or a mobile object that moves in an unmanned manner (e.g., drones, autonomous vehicles, etc.), or a robot (humanoid or non-humanoid). Additionally, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0471] Figure 16 It is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes: a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a gear shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotational speed sensor 51, a pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a gear shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0472] The drive unit 41 is constituted by, for example, at least one of an engine, an electric motor, and a hybrid of an engine and an electric motor. The steering unit 42 is configured to at least include a steering wheel (also referred to as a steering disk), and steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0473] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (e.g., an input / output (IO) port) 63. Signals from various sensors 50 - 58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an electronic control unit (Electronic Control Unit (ECU)).

[0474] As signals from various sensors 50 - 58, there are current signals from the current sensor 50 that senses the current of the motor, rotational speed signals of the front wheels 46 / rear wheels 47 obtained by the rotational speed sensor 51, air pressure signals of the front wheels 46 / rear wheels 47 obtained by the air pressure sensor 52, vehicle speed signals obtained by the vehicle speed sensor 53, acceleration signals obtained by the acceleration sensor 54, depression amount signals of the accelerator pedal 43 obtained by the accelerator pedal sensor 55, depression amount signals of the brake pedal 44 obtained by the brake pedal sensor 56, operation signals of the shift lever 45 obtained by the shift lever sensor 57, detection signals for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 58, and so on.

[0475] The information service unit 59 is composed of various devices such as a vehicle navigation system, an audio system, speakers, a display, a television, a radio, which are used to provide (output) various information such as driving information, traffic information, entertainment information, etc., and one or more ECUs that control these devices. The information service unit 59 uses information obtained from an external device via a communication module 60, etc., to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0476] The information service unit 59 may include an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accepts input from the outside, and may also include an output device (e.g., a display, a speaker, an LED light, a touch panel, etc.) that performs output to the outside.

[0477] The driving assistance system unit 64 is composed of a millimeter-wave radar, a Light Detection and Ranging (LiDAR), a camera, a positioning locator (such as a Global Navigation Satellite System (GNSS), etc.), map information (such as a high-precision (High Definition (HD)) map, an Autonomous Vehicle (AV) map, etc.), a gyroscope system (such as an inertial measurement device (Inertial Measurement Unit (IMU)), an inertial navigation device (Inertial Navigation System (INS)), etc.), an Artificial Intelligence (AI) chip, an AI processor, and various devices for providing functions to prevent accidents in advance or reduce the driving load of the driver, and one or more ECUs for controlling these devices. In addition, the driving assistance system unit 64 transmits and receives various information via the communication module 60 and realizes the driving assistance function or the autonomous driving function.

[0478] The communication module 60 can communicate with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 between the driving unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the gear lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50 - 58 provided in the vehicle 40.

[0479] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, various information is transmitted and received via wireless communication with the external device. The communication module 60 can be located either inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, the user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and the user terminal 20 (and can also function as at least one of the base station 10 and the user terminal 20).

[0480] The communication module 60 can also send at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on such signals, and information based on inputs from the external (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. can also be referred to as input units that accept inputs. For example, the PUSCH sent via the communication module 60 can also include information based on the above inputs.

[0481] The communication module 60 receives various information (traffic information, traffic light information, inter-vehicle information, etc.) sent from an external device and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 can also be referred to as an output unit that outputs information (for example, based on the PDSCH received via the communication module 60 (or data / information decoded from the PDSCH), outputs information to devices such as a display and a speaker).

[0482] In addition, the communication module 60 stores various information received from an external device in a memory 62 that can be utilized by the microprocessor 61. The microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the gearshift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the various sensors 50-58, etc. provided in the vehicle 40 based on the information stored in the memory 62.

[0483] In addition, the base station in the present disclosure can also be rewritten as a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, it can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various modes / embodiments of the present disclosure can also be applied. In this case, it can also be configured such that the user terminal 20 has the functions of the above base station 10. In addition, terms such as "uplink" and "downlink" can also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. can also be rewritten as a sidelink channel.

[0484] Similarly, the user terminal in the present disclosure can also be rewritten as a base station. In this case, it can also be configured such that the base station 10 has the functions of the above user terminal 20.

[0485] In the present disclosure, actions performed by a base station may sometimes be performed by its upper node depending on the situation. Apparently, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0486] Each mode / embodiment described in the present disclosure may be used alone, in combination, or switched during execution. In addition, the processing procedures, timings, flowcharts, etc. of each mode / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the methods described in the present disclosure, elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0487] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth generation mobile communication system (5G), the sixth generation mobile communication system (6G), the xth generation mobile communication system (xG (x is an integer or a decimal, for example)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems enhanced, modified, made, or defined based on them, etc. In addition, multiple systems can be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

[0488] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0489] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not comprehensively define the quantity or order of these elements. These terms can be used in this disclosure as a convenient way to distinguish between more than two elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted, or that the first element must be prior to the second element in a certain form.

[0490] The term "determining" used in this disclosure may involve various actions in some cases. For example, "determining" may also be a case where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring) (such as searching in a table, database, or other data structure), ascertaining, etc. are regarded as performing "determining".

[0491] In addition, "determining" may also be a case where receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc. are regarded as performing "determining".

[0492] In addition, "determining" may also be a case where resolving, selecting, choosing, establishing, comparing, etc. are regarded as performing "determining". That is, "determining" may also be a case where some actions are regarded as performing "determining".

[0493] In addition, "determining" may also be rewritten as "assuming", "expecting", "considering", etc.

[0494] The "maximum transmit power" described in this disclosure may either refer to the maximum value of the transmit power, or the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0495] As used in this disclosure, the terms "connected" and "coupled", and all variations thereof, mean all direct or indirect connections or couplings between two or more elements, and can include the case where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of them. For example, "connected" can also be rewritten as "access".

[0496] In this disclosure, when two elements are connected, it is possible to consider that they are "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, using electromagnetic energy with wavelengths in the radio frequency range, microwave region, and optical (both visible and invisible) region, etc., so as to be "connected" or "coupled" to each other.

[0497] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". Additionally, this term can also mean "A and B are each different from C". Terms such as "separated" and "coupled" can also be interpreted in the same way as "different".

[0498] When the terms "include", "including", and their variations are used in this disclosure, these terms, like the term "comprising", have an inclusive meaning. Further, the term "or" used in this disclosure does not mean the exclusive or.

[0499] In this disclosure, for example, in cases where articles are added through translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0500] In this disclosure, terms such as "below", "less than", "above", "more than", "equal to", etc. can also be rewritten with each other. In addition, in this disclosure, terms that mean "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. are not limited to the positive degree, comparative degree, and superlative degree, and can also be rewritten with each other. In addition, in this disclosure, terms that mean "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be expressed as statements with "the i-th" (i is an arbitrary integer) added, and are not limited to the positive degree, comparative degree, and superlative degree and can be rewritten with each other (for example, "the highest" can also be rewritten with "the i-th highest").

[0501] In the present disclosure, terms such as "of", "for", "regarding", "related to", "associated with", etc. may also be rewritten with each other.

[0502] As described above, the invention related to the present disclosure has been described in detail. However, for those skilled in the art, the invention related to the present disclosure is obviously not limited to the embodiments described in the present disclosure. The invention related to the present disclosure can be implemented in the form of amendments and variations without departing from the gist and scope of the invention determined based on the description in the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not carry any restrictive meaning with respect to the invention related to the present disclosure.

[0503] This application is based on Japanese Patent Application No. 2022-181880 filed on November 14, 2022. The entire content thereof is incorporated herein.

Claims

1. A terminal, comprising: a receiving unit, configured to receive information related to a rank; and a control unit, configured to control transmission of a specific rank corresponding to a reconstructed CSI or a quasi-reconstructed CSI corresponding to a channel state information CSI reconstructed by a base station.

2. The terminal according to claim 1, wherein the terminal further comprises a transmitting unit, and the transmitting unit transmits a recommended rank value, and the recommended rank value is used for physical downlink shared channel PDSCH transmission of a precoding matrix derived by means of the reconstructed CSI or the quasi-reconstructed CSI, and the receiving unit receives the information related to the rank determined based on the recommended rank value.

3. The terminal according to claim 1, wherein the terminal further comprises a transmitting unit, and the transmitting unit transmits information associated with the precoding matrix, and the receiving unit receives a reference signal for a precoding matrix obtained by means of the reconstructed CSI or the quasi-reconstructed CSI.

4. The terminal according to claim 3, wherein the transmitting unit transmits at least one of a channel state information reference signal resource indicator CRI, a channel quality indicator CQI, and a rank indicator RI corresponding to the reference signal.

5. A wireless communication method, which is a wireless communication method of a terminal, comprising: a step of receiving information related to a rank; and a step of controlling transmission of a specific rank corresponding to a reconstructed CSI or a quasi-reconstructed CSI corresponding to a channel state information CSI reconstructed by a base station.

6. A base station, comprising: a transmitting unit, configured to transmit information related to a rank; and a control unit, configured to control reception of a specific rank corresponding to a reconstructed CSI or a quasi-reconstructed CSI corresponding to a channel state information CSI reconstructed by a base station.

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