Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a control unit that acquires channel information on the basis of a measurement; and a transmission unit that transmits the channel information and the channel characteristic information associated with the channel information. According to one embodiment of the present disclosure, it is possible to achieve appropriate overhead reduction / channel estimation / utilization of resources.

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

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

[0004] Prior art literature

[0005] Non-patent literature

[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, research is underway to flexibly utilize artificial intelligence (AI) technologies such as machine learning (ML) in network / device control and management. For example, regarding future wireless communication technologies, research is underway to flexibly utilize AI technologies to improve channel state information (Channel State Information Reference Signal (CSI)) feedback, such as reducing overhead, improving accuracy, and predicting. CSI feedback based on AI technology can also be referred to as AI-aided CSI feedback.

[0009] As a method of AI-assisted CSI feedback, the use of autoencoders (autoencoders) is being studied. Autoencoders can also be used for compression / reconstruction of channel information.

[0010] If the autoencoder cannot be trained in consideration of the channel characteristics, it will be difficult to perform appropriate inference. However, there has been no research on how to determine the data set for training the autoencoder, how to notify the UE of the appropriate encoder, etc. If these cannot be properly specified, it will be impossible to achieve appropriate overhead reduction / high-precision channel estimation / efficient resource utilization, and there is a concern that the communication throughput / communication quality improvement will be suppressed.

[0011] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can achieve appropriate overhead reduction / channel estimation / resource utilization.

[0012] Means for solving problems

[0013] A terminal according to one aspect of the present disclosure includes: a control unit that acquires channel information based on measurement; and a transmission unit that transmits the channel information and channel characteristic information associated with the channel information.

[0014] Effects of the Invention

[0015] According to one aspect of the present disclosure, appropriate overhead reduction / channel estimation / resource utilization can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing an example of CSI feedback using an encoder / decoder.

[0017] Figure 2 This is a diagram showing an example of the relationship between channel characteristics and performance.

[0018] Figure 3A-3C This is a diagram showing an example of channel characteristics and AI model training.

[0019] Figure 4 This is a diagram showing an example of an encoder identified by type information.

[0020] Figure 5 This is a diagram showing an example of an encoder identified by type information.

[0021] Figure 6 This is a diagram showing an example of an encoder identified by type information.

[0022] Figure 7 This is a diagram showing an example of the flow until the MCR is transmitted in the third embodiment.

[0023] Figure 8 This is a diagram showing an example of the occurrence of MFD.

[0024] Fig. 9 This is a diagram showing an example of a plurality of sets of information related to MFD.

[0025] Fig.10 This is a diagram showing an example of the flow until the application of the model after MCC reception in the fifth embodiment.

[0026] Fig.11 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0027] Fig.12 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0028] Fig.13 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0029] Fig.14 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment.

[0030] Fig.15 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

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

[0032] Regarding future wireless communication technologies, research is underway to utilize AI technologies such as machine learning (ML) in the control and management of networks and devices.

[0033] For example, regarding future wireless communication technologies, research is underway to flexibly utilize AI technology to improve channel state information (Channel State Information Reference Signal (CSI)) feedback (e.g., overhead reduction, accuracy improvement, prediction), beam management improvement (e.g., accuracy improvement, prediction in the time / space domain), and position measurement improvement (e.g., position estimation / prediction improvement). CSI feedback based on AI technology may also be referred to as AI-aided CSI feedback.

[0034] Channel measurement / estimation can also be performed using at least one of the Channel State Information Reference Signal (CSI-RS)), the Synchronization Signal (SS)), the Synchronization Signal / Broadcast Channel (Synchronization Signal / Physical Broadcast Channel (SS / PBCH)) block, the DeModulation Reference Signal (DMRS) and the Measurement Reference Signal (Sounding Reference Signal (SRS)).

[0035] In addition, the existing CSI may also include at least one of a channel quality indicator (Channel Quality Indicator (CQI)), a precoding matrix indicator (Precoding Matrix Indicator (PMI)), a CSI-RS resource indicator (CSI-RS Resource Indicator (CRI)), a SS / PBCH block resource indicator (SS / PBCH Block Resource Indicator (SSBRI)), a layer indicator (Layer Indicator (LI)), a rank indicator (Rank Indicator (RI)), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), and L1-SNR (Signal to Noise Ratio).

[0036] In AI-assisted CSI feedback, it is required to reduce this information or feedback smaller information that replaces this information.

[0037] As a method of AI-assisted CSI feedback, the use of autoencoders (autoencoders) is being studied. Autoencoders can also be used for compression / reconstruction of channel information.

[0038] In addition, in the present disclosure, channel information may also be information related to a channel (or a channel matrix). The channel matrix may include information about channel coefficients for each subband / each antenna port, or information obtained from the channel coefficients after an inverse discrete Fourier transform (IDFT). The latter information can make the matrix sparse by transforming the channel matrix into an angle / delay domain compared to the former information, and thus can be expected to contribute to the speed-up of encoder operations, etc.

[0039] In addition, the channel information may also be information related to the precoding matrix. The precoding matrix may include information about the precoding coefficients (elements of the precoding matrix) for each subband / each antenna port / each MIMO layer, or information after the precoding coefficients are IDFTed. The latter information can make the matrix sparse (sparse) compared to the former information by transforming the precoding matrix into the angle / delay domain, so it can be expected to contribute to the high-speed operation of the encoder, etc.

[0040] Figure 1 This is a diagram showing an example of CSI feedback using an encoder / decoder. In this example, it is assumed that the encoding part (encoder) and the corresponding decoding part (decoder) in the auto encoder are trained in the base station, but it can also be trained in the UE.

[0041] In this example, information related to the encoder trained by the base station can also be notified to the UE using high-level signaling, and the UE can also input the channel matrix H / precoding matrix W as channel information into the encoder, implement the encoded value / bit (and then apply quantization), and send the information containing the bit (CSI feedback) from the antenna.

[0042] In this example, the decoder trained by the base station is directly kept in the base station and used for inference. The base station inputs the bits of the received CSI feedback into the decoder, and outputs the reconstructed input information.

[0043] The encoder and decoder need to be trained using the same data set. Otherwise, the reconstructed input information is completely different from the original input information. However, even within the coverage area of ​​a base station, there may be multiple channel characteristics. Channel characteristics can also be equivalent to Line Of Site (LOS) / Non-Line Of Site (NLOS), for example.

[0044] Here, LOS may also mean that the UE and the base station are in an environment where they can see each other (or there are no obstructions), and NLOS may also mean that the UE and the base station are not in an environment where they can see each other (or there are obstructions).

[0045] If the auto encoder cannot be trained in consideration of the channel characteristics, it will be difficult to perform appropriate inference. However, there has been no research on how to determine the data set for training the auto encoder, how to notify the UE of the appropriate encoder, etc. If these cannot be properly specified, it will be impossible to achieve appropriate overhead reduction / high-precision channel estimation / efficient resource utilization, and there is a concern that the improvement of communication throughput / communication quality will be suppressed.

[0046] The inventors of the present invention have discovered that there is a trade-off between the performance of the encoder (e.g., compression rate, error of reconstructed information from original information, etc.) and the scope of application of the AI ​​model.

[0047] Specifically, the inventors of the present invention found the following:

[0048] When using an AI model trained specifically for a specific channel, the best performance can be expected for that specific channel.

[0049] In the case of an AI model trained using a set of channels with similar channel characteristics (e.g., NLOS channels), quasi-optimal performance can be expected for the set.

[0050] In the case of using an AI model trained for a set of channels with various channel characteristics (for example, NLOS channels and LOS channels), it is possible to expect poor performance for the set.

[0051] Figure 2 This is a diagram showing an example of the relationship between channel characteristics and performance. This example is a bird's-eye view (or a top view from above) of a base station, several buildings (shielding objects), etc. Figure 2 AE is shown in FIG. If the channel characteristics with the base station are considered, then AC is equivalent to NLOS, and DE is equivalent to LOS. In other words, the channel characteristics of A / B / C can also be equivalent to relatively poor (NLOS) channel characteristics, and the channel characteristics of D / E can also be equivalent to relatively good (LOS) channel characteristics.

[0052] In addition, in this disclosure, AE referred to below is equivalent to Figure 2 Location AE.

[0053] The inventors of the present invention found that, for example, when an AI model is generated using only channel information obtained in A (via UE), the inference performance for A is very good, but the application scope of the AI ​​model is narrow (it is not suitable for inference of channel information of other BEs).

[0054] In addition, the inventors of the present invention found that when the AI ​​model is generated using only the channel information obtained in the AC corresponding to NLOS (through the UE), the inference performance for the AC is good, but the application scope of the AI ​​model is slightly narrow (it is not suitable for inference of channel information of other DEs).

[0055] Furthermore, the inventors of the present invention have found that, when an AI model is generated using channel information obtained in an AE (via a UE), the inference performance for the AE is not very good, but the application range of the AI ​​model is wide.

[0056] With respect to the relationship between these performances and the scope of application of the model, it is preferred that the UE / network be able to respond flexibly.

[0057] Therefore, the inventors of the present invention have come up with a control method suitable for AI-assisted information transmission. In addition, each embodiment of the present disclosure can also be applied to situations where AI / prediction is not used.

[0058] In one embodiment of the present disclosure, a terminal (user terminal, user equipment (UE)) / base station (Base Station (BS)) trains an ML model in a training mode and implements the ML model in an inference mode (which may also be referred to as an inference mode, inference mode, etc.). In the inference mode, the accuracy of the ML model trained in the training mode may also be verified (validation).

[0059] In the present disclosure, UE / BS can also input channel state information, reference signal measurement values, etc. into the ML model, and output high-precision channel state information / measurement values / beam selection / position, future channel state information / radio link quality, etc.

[0060] In addition, in the present disclosure, AI can also be rewritten as an object (also referred to as an object, object, data, function, program, etc.) having (implementing) at least one of the following characteristics:

[0061] Estimates based on observed or collected information,

[0062] · Selection based on observed or collected information,

[0063] Predictions based on observed or collected information.

[0064] In the present disclosure, the object may be, for example, a device, such as a terminal or a base station, or a device, etc. In addition, the object may also be equivalent to a program included in the device.

[0065] In addition, in the present disclosure, the ML model may also be rewritten as an object having (implementing) at least one of the following features:

[0066] Generate estimates by providing information (feeding),

[0067] By providing information, forecasting estimates,

[0068] ·Discover features by providing information,

[0069] · Select an action by providing information.

[0070] In addition, in the present disclosure, ML models, models, AI models, predictive analytics, predictive analytics models, etc. can also be rewritten into each other. In addition, ML models can also be derived using at least one of regression analysis (e.g., linear regression analysis, multivariate regression analysis, logistic regression analysis), support vector machine, random forest, neural network, deep learning, etc. In the present disclosure, models can also be rewritten into at least one of encoders, decoders, tools, etc.

[0071] The ML model outputs at least one piece of information such as an estimated value, a predicted value, a selected operation, a classification, etc. based on the input information.

[0072] ML models can also include supervised learning, unsupervised learning, reinforcement learning, etc. Supervised learning can also be used to learn general rules for mapping inputs to outputs. Unsupervised learning can also be used to learn features of data. Reinforcement learning can also be used to learn operations for maximizing a goal.

[0073] The following embodiments are described mainly on the assumption that supervised learning is used in an ML model, but are not limited to this.

[0074] In the present disclosure, implementation, application, operation, execution, etc. may be replaced by each other. In addition, in the present disclosure, inference, after-training, formal utilization, actual utilization, etc. may be replaced by each other. Signal may be replaced by signal / channel.

[0075] In the present disclosure, the training mode may also correspond to a mode in which the UE / BS transmits / receives signals for the ML model (in other words, an operation mode during training). In the present disclosure, the inference mode may also correspond to a mode in which the UE / BS implements the ML model (e.g., implements the trained ML model to predict output) (in other words, an operation mode during inference).

[0076] In the present disclosure, the training mode may also mean a mode in which a specific signal transmitted in the inference mode is transmitted with high overhead (eg, a large amount of resources).

[0077] In the present disclosure, the training mode may also refer to a mode with reference to a first setting (e.g., a first DMRS setting, a first CSI-RS setting). In the present disclosure, the inference mode may also refer to a mode with reference to a second setting different from the first setting (e.g., a second DMRS setting, a second CSI-RS setting). The first setting may also be set more than the second setting in terms of at least one of the time resources, frequency resources, code resources, and ports (antenna ports) related to the measurement.

[0078] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0079] In the following embodiments, since the ML model related to the communication between UE and BS is described, the associated subjects are UE and BS, but the application of the embodiments of the present disclosure is not limited to this. For example, for communication between other subjects (for example, communication between UE and UE), the UE and BS in the following embodiments can also be rewritten as the first UE and the second UE. In other words, any one of the UE, BS, etc. of the present disclosure can be rewritten as any UE / BS.

[0080] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C".

[0081] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may also be mutually rewritten. In the present disclosure, support, control, controllable, operate, and can operate may also be mutually rewritten.

[0082] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, fields, Information Element (IE), settings, etc. may also be overwritten with each other. In the present disclosure, Medium Access Control (MAC) control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc. may also be overwritten with each other.

[0083] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0084] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0085] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0086] In the present disclosure, index, identifier (ID), indicator, resource ID, etc. may also be mutually overwritten. In the present disclosure, sequence, list, set, group, cluster, subset, etc. may also be mutually overwritten.

[0087] In the present disclosure, panel, UE panel, panel group, beam, beam group, precoder, uplink (UL) transmission entity, transmission / reception point (transmission / reception point (TRP))), base station, spatial relationship information (Spatial Relation Information (SRI)), spatial relationship, SRS resource indicator (SRS Resource Indicator (SRI)), control resource set (COntrol REsource SET (CORESET)), physical downlink shared channel (Physical Downlink Shared Channel (PDSCH)), codeword (Codeword (CW)), transport block (Transport Block (TB)), reference signal (Reference Signal (RS)), antenna port (e.g., demodulation reference signal (DeModulation Reference Signal, DeModulation Reference Signal (DMRS)) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, code division multiplexing (Code Division Multiplexing (CDM)) group, reference signal group, CORESET group, physical uplink control channel (Physical Downlink Shared Channel (PDSCH)), codeword (Codeword (CW)), transport block (Transport Block (TB)), reference signal (Reference Signal (RS)), antenna port (e.g., demodulation reference signal (DeModulation Reference Signal, DeModulation Reference Signal (DMRS)) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, code division multiplexing (Code Division Multiplexing (CDM)) group, reference signal group, CORESET group, physical uplink control channel (Physical Uplink Control Channel (PUCCH)) group, PUCCH resource group), resources (for example, reference signal resources, SRS resources), resource sets (for example, reference signal resource sets), CORESET pool, downlink transmission configuration indication state (Transmission Configuration Indication state (TCI state)) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state (unified TCI state), common TCI state (common TCI state), Quasi-Co-Location (Quasi-Co-Location (QCL)), QCL assumptions, etc. can also be rewritten with each other.

[0088] In the present disclosure, CSI-RS, Non Zero Power (NZP) CSI-RS, Zero Power (ZeroPower (ZP)) CSI-RS and CSI Interference Measurement (CSI-IM) may also be replaced with each other. In addition, CSI-RS may also include other reference signals.

[0089] In the present disclosure, the measured / reported RS may also mean the RS measured / reported for CSI reporting.

[0090] In the present disclosure, timing, moment, time, time slot, sub-slot, symbol, sub-frame, etc. may be replaced with each other.

[0091] In the present disclosure, direction, axis, dimension, domain, polarization, polarization component, etc. can also be rewritten as one another.

[0092] In the present disclosure, RS may be, for example, CSI-RS, SS / PBCH block (SS block (SSB)), etc. In addition, RS index may be CSI-RS resource indicator (CSI-RS Resource Indicator (CRI)), SS / PBCH block resource indicator (SS / PBCH Block Indicator (SSBRI)), etc.

[0093] In the present disclosure, estimation, prediction, and inference may be replaced with each other. In addition, in the present disclosure, estimation, prediction, and inference may be replaced with each other.

[0094] In the present disclosure, the autoencoder, encoder, decoder, etc. can also be rewritten as at least one of a model, an ML model, a neural network model, an AI model, an AI algorithm, etc. In addition, the autoencoder can also be rewritten with any autoencoder such as a stacked autoencoder (Stacked Autoencoder) and a convolutional autoencoder. The encoder / decoder of the present disclosure can also adopt models such as a residual network (Residual Network (ResNet)), a densely connected network (DenseNet), and a multi-path reinforcement network (RefineNet).

[0095] In addition, in the present disclosure, encoders, encoding processes, encoding, and corrections, changes, and controls based on encoders may be replaced with each other. In addition, in the present disclosure, decoders, decoding processes, decoding, and corrections, changes, and controls based on decoders may be replaced with each other.

[0096] In the present disclosure, UCI, CSI report, CSI feedback, feedback information, feedback bit, etc. may also be replaced by each other. In addition, in the present disclosure, bit, bit string, bit sequence, sequence, value, information, value obtained from bit, information obtained from bit, etc. may also be replaced by each other.

[0097] In the present disclosure, the layers (for the encoder) may also be mutually rewritten with the layers (input layer, intermediate layer, etc.) used in the AI ​​model. The layers of the present disclosure may also be equivalent to at least one of the input layer, intermediate layer, output layer, batch normalization layer, convolution layer, dropout layer, fully connected layer, etc.

[0098] In the present disclosure, the layers for precoding matrices may be interchangeably with Multi Input Multi Output (MIMO) layers, streams, and the like.

[0099] (Wireless Communication Method)

[0100] <First embodiment>

[0101] The first embodiment relates to information related to channel characteristics (which may also be referred to as channel characteristics information, additional information, improved information, detailed information, etc.).

[0102] In the first embodiment, in addition to the channel information, the UE also sends channel characteristic information to the network. In addition, the channel characteristic information can be sent simultaneously with the channel information or at a different timing.

[0103] For example, the UE may obtain a channel coefficient based on measurement related to a reference signal and obtain the channel information. The channel characteristic information may also indicate the channel characteristic at the timing of obtaining the channel information.

[0104] The UE may also be notified of information related to reporting of channel information / channel characteristic information from the network using physical layer signaling (e.g., DCI), high-layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel, or a combination thereof. The UE may also report channel information / channel characteristic information based on the information.

[0105] The UE may also send channel characteristic information to the network using physical layer signaling (e.g., UCI), high layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel, or a combination thereof. The channel characteristic information may also be included in a CSI report and sent together with the channel information.

[0106] The channel characteristic information may include information related to LOS / NLOS and location information, for example. In other words, the channel characteristic may correspond to LOS, NLOS, the location of the UE, etc. In addition, the channel characteristic information may also include information on the timing (time) of obtaining / determining the channel information ( / channel characteristic / channel characteristic information).

[0107] The location information may also be location information related to the UE / base station. The location information may also include information (e.g., latitude, longitude, altitude) obtained using a positioning system (e.g., a satellite positioning system (Global Navigation Satellite System (GNSS)), a Global Positioning System (GPS), etc.)), information of base stations adjacent to (or in service of) the UE (e.g., an identifier (ID) of a 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., 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 the above. The location information of the UE is not limited to information based on the location of the BS, but may also be information based on a specific point.

[0108] The location information may also include information related to its own implementation (for example, the location / position / orientation of the antenna, the location / orientation of the antenna panel, the number of antennas, the number of antenna panels, etc.).

[0109] The location information may also include mobility information. The mobility information may also include information indicating a mobility type, information indicating at least one of a moving speed of the UE, an acceleration of the UE, and a moving direction of the UE.

[0110] Here, the mobility type may also be equivalent 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 non-cell-edge UE, etc.

[0111] The UE may determine the channel characteristic information based on at least one of the RS measurement result and the location information acquisition result.

[0112] Channel characteristic information (eg, LOS / NLOS, etc.) may also be represented by an index (eg, a LOS / NLOS indicator).

[0113] The base station may also consider the channel characteristic information reported from the UE and train the AI ​​model (encoder / decoder) of the channel information at different granularities according to the channel characteristics.

[0114] In addition, in the present disclosure, the UE / base station may also be able to use more than one encoder / decoder. The more than one encoder / decoder may be, for example, a common encoder / decoder for all channel characteristics, a common encoder / decoder for several channel characteristics, or an encoder / decoder for each channel characteristic.

[0115] Figure 3A-3C This is a diagram showing an example of channel characteristics and AI model training. Figure 3A An example is shown in which the AI ​​model is trained using all channel information without distinguishing channel characteristics. Figure 3B An example of training an AI model using channel information related to several channel characteristics is shown. Figure 3C An example of training an AI model using channel information related to a channel characteristic is shown.

[0116] In this disclosure, in this example and the following examples, the assumed channel characteristics are set to five (with Figure 2 The encoder (ABC) / decoder (ABC) may also mean an inference suitable for a channel having the channel characteristics of A / B / C.

[0117] exist Figure 3A In the example, the base station uses the channel information reported together with the channel characteristic information representing A / B / C / D / E as a data set without distinguishing them to train the AI ​​model of channel information for ABCDE.

[0118] exist Figure 3B In the example, the base station uses the channel information reported together with the channel characteristic information representing A / B / C as a data set to train the AI ​​model for channel information for ABC. Figure 3B In the training, the base station uses the channel information reported together with the channel characteristic information representing D / E as a data set to train the AI ​​model of channel information for DE. That is, the channel information reported together with the channel characteristic information representing A / B / C is not used in the training of the AI ​​model of channel information for DE.

[0119] exist Figure 3C In the training, the base station uses the channel information reported together with the channel characteristic information representing X (X is any one of A, B, C, D and E) as a data set without distinguishing them, to train the AI ​​model for the channel information of X. That is, the channel information reported together with the channel characteristic information representing different channel characteristics is not used in the training of the AI ​​model for the channel information of a certain channel characteristic.

[0120] Furthermore, when certain channel characteristic information and another channel characteristic information indicate the same LOS / NLOS / position information but correspond to different times, it may be determined that the channel characteristic of the channel characteristic information is different from the channel characteristic corresponding to the other channel characteristic information.

[0121] According to the first embodiment described above, for example, channel information is transmitted in association with channel characteristic information, thereby enabling the AI ​​model to be appropriately trained using only channel information corresponding to specific channel characteristics as a data set.

[0122] <Second embodiment>

[0123] The second embodiment relates to information for determining an encoder used by a UE. The information may also be referred to as encoder determination information, type information for an encoder, encoder type information, or simply type information. In addition, type may be interchangeable with mode, set, subset, group, type, classification, etc.

[0124] The UE may determine the type information based on specific rules / UE capabilities, or may be notified by the network using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels, or a combination thereof.

[0125] Type information may also be associated with any or a combination of the following:

[0126] ·Specific encoder application range,

[0127] ·Specific encoder accuracy / performance,

[0128] Channel characteristics,

[0129] The complexity of the encoder,

[0130] · Encoder input / output.

[0131] The above-mentioned application scope may also be, for example, a cell, a region, a channel, etc., and each encoder may also be referred to as a cell-specific encoder, an area-specific encoder, or a channel-specific encoder. A cell-specific encoder may also be used across all different channels. An area-specific encoder may also be used across channels having the same characteristics. A channel-specific encoder may also be used in a channel characteristic.

[0132] The type information indicating that the application scope of the encoder is a cell may also be referred to as type X. The type information indicating that the application scope of the encoder is a region may also be referred to as type Y. The type information indicating that the application scope of the encoder is a channel may also be referred to as type Z.

[0133] The accuracy / performance may be, for example, high performance, medium performance, low performance, etc. The accuracy / performance evaluation index (which may also be referred to as a performance indicator (PI), a key performance indicator (KPI), etc.) may also be set / specified together with the type or type information. The evaluation index may also be the expected normalized mean square error (NMSE), spectrum efficiency, etc. in different application scenarios.

[0134] Type information indicating that the accuracy / performance of the encoder is high may also be referred to as type I. Type information indicating that the accuracy / performance of the encoder is medium may also be referred to as type II. Type information indicating that the accuracy / performance of the encoder is low may also be referred to as type III.

[0135] The channel characteristics may be, for example, a LOS channel, a NLOS channel, a mixed LOS and NLOS channel, etc. The channel characteristics may be, for example, urban, rural, indoor, etc.

[0136] Type information indicating that the channel characteristic is LOS or urban may also be referred to as type a. Type information indicating that the channel characteristic is NLOS or rural may also be referred to as type b. Type information indicating that the channel characteristic is mixed or indoor may also be referred to as type c.

[0137] In addition, the names such as type XZ, I-III, and ac are just examples, and the actual names are not limited to these.

[0138] The above complexity can also be expressed by using at least one of the number of encoder layers, input size, output size, number of encoder parameters, floating point operations (FLOPs (in addition, s is a lowercase letter)) involved in encoding, etc.

[0139] The above-mentioned input / output may also be channel information, channel matrix, specific vector, etc.

[0140] Figure 4-Figure 6 This is a diagram showing an example of an encoder specified by type information.

[0141] like Figure 4 As shown, the encoder corresponding to type X may also be one (encoder (ABCDE)). In addition, the encoder corresponding to type Y may also be at least one of the two (encoder (ABC), encoder (DE)). In addition, the encoder corresponding to type Z may also be at least one of the five (encoder (A), encoder (B), encoder (C), encoder (D), encoder (E)).

[0142] like Figure 5 As shown, the encoder corresponding to type I may also be at least one of the three (encoder (DE), encoder (D), encoder (E)). In addition, the encoder corresponding to type II may also be at least one of the four (encoder (ABC), encoder (A), encoder (B), encoder (C)). In addition, the encoder corresponding to type III may also be one (encoder (ABCDE)).

[0143] like Figure 6 As shown, the encoder may also be determined based on the application range and accuracy / performance of the encoder. For example, a UE that is set to type Z and type II may also use at least one of encoder (A), encoder (B), and encoder (C). A UE that is set to type Z and type I may also use at least one of encoder (D) and encoder (E).

[0144] In addition, UEs configured with type Y and type II may also use encoder (ABC). UEs configured with type Y and type I may also use encoder (DE). UEs configured with type X / type III may also use encoder (ABCDE).

[0145] In addition, in the present disclosure, the UE / base station does not need to process all of the AE, and may also process locations other than the AE.

[0146] According to the second embodiment described above, the UE can appropriately determine the encoder to be used.

[0147] <Third Embodiment>

[0148] The third embodiment relates to a change of the model.

[0149] The base station and the UE preferably have a common understanding of the AI ​​model actually used (for example, the AI ​​model in the case of cooperation between the UE and the network during model inference). Otherwise, the decoded result is different from the expectation.

[0150] When the type information (see the second embodiment) is notified to the UE and only one encoder is determined by the information, there is no difference in the recognition of the AI ​​model between the base station and the UE.

[0151] When the type information is notified to the UE and multiple encoders are determined by the information, the UE may also select one encoder from the multiple encoders and send information related to the selected encoder to the network.

[0152] In addition, the UE can also obtain current channel characteristic information and decide which encoder to select based on this.

[0153] The UE may also use physical layer signaling (e.g., UCI), high-layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel, or a combination thereof to send information related to the selected encoder to the network. The information related to the selected encoder may also be included in a CSI report and sent, for example.

[0154] After sending the information related to the selected encoder, the UE may also send the information related to the selected other encoder to the network when selecting another encoder from the above-mentioned multiple encoders.

[0155] The UE may also send a Model Change Request (MCR) to the network when certain conditions are met. The MCR may also be sent to the network using physical layer signaling (e.g., UCI), high-layer signaling (e.g., RRC signaling, MACCE), a specific signal / channel (e.g., PRACH, PUCCH, PUSCH), or a combination thereof.

[0156] In addition, the control after the MCR is sent will be described later in the fourth embodiment.

[0157] [MCR trigger conditions]

[0158] The condition (trigger condition) for sending the MCR may also be set by higher layer signaling. The MCR may also be triggered by Model Failure Monitoring (MFM). For example, the UE may be set with setting information (MFM setting) for MFM by higher layer signaling.

[0159] In addition, MFM can also be called Model Failure Detection (MFD). In addition, MCR can also be called Model Failure Recovery Request (MFRR) or model feedback.

[0160] Figure 7 This is a diagram showing an example of the process until the MCR is sent in the third embodiment. In this example, first, the base station sets two types of information (one is type X that can identify the encoder (ABCDE), and the other is type Z that can identify the encoder (A)) for the UE.

[0161] The UE determines that the current channel characteristics correspond to point A, and selects encoder (A). The UE transmits information related to the selected encoder (A) to the base station.

[0162] The base station sends the MCR setting to the UE (described later). In addition, the sending timing of the MCR setting is not limited to the timing shown in the figure (for example, it can also be before the setting of the type information). The MFM setting can be sent to the UE at the same timing as the MCR setting, or at a different timing.

[0163] The UE performs measurements based on the MFM settings and triggers the MCR when certain conditions are met. The triggered MCR may also be sent more than once (described later).

[0164] The MFM settings may also include information related to at least one of the following:

[0165] ·MFD judgment criteria (criterion, criteria)

[0166] MF instance max counter,

[0167] MFD timer (or period for MFD).

[0168] In addition, this information may also be notified to the UE using one or more RRC information elements.

[0169] The UE may also determine that MFD has occurred (MF is detected) when the MF instance counter becomes greater than the MF instance maximum counter before the MFD timer starts to expire. In addition, the processing of MFD may be managed in the MAC layer (L2 (layer-2) layer) of the UE.

[0170] In case of receiving (notifying) the MF instance from a lower layer (eg, PHY layer, L1 (layer-1) layer), the MFD timer may also be started or restarted and the MF instance counter may also be incremented (in other words, +1).

[0171] In addition, the initial value of the MF instance counter may also be 0. When the MFD timer expires or an MCR is sent, the MF instance counter may also be set to the initial value.

[0172] The PHY layer of the UE may also perform measurements corresponding to the MFD standard, and send the MF instance to the MAC layer if the measurement result meets the conditions corresponding to the MFD standard.

[0173] In addition, at least part of the above-mentioned MAC layer processing and PHY layer processing may not be limited to these layers, and other layers may be used, or they may be performed in one layer. For example, in one layer, the MFD timer may be started / restarted, and counting (counter incrementing) may be performed when the conditions corresponding to the MFD standard are met. When the counter becomes greater than the maximum counter of the MF instance, it is determined that MFD has occurred and the MCR is triggered. In this case, the MF instance may not be generated / notified.

[0174] The MFD standard may also include, for example, at least one of the following:

[0175] Reference signals used for measurement (e.g., SSB, CSI-RS, DMRS),

[0176] Channels used for measurement (e.g., PDCCH, PDSCH, PUCCH, PUSCH),

[0177] Metrics used for measurement,

[0178] Thresholds for the above conditions,

[0179] · Model of application / concept.

[0180] The above metric may also be at least one of the following:

[0181] Block error rate (Block Error Rate (BLER))

[0182] Modulation and Coding Scheme (MCS),

[0183] LOS / NLOS (detection of LOS / NLOS, or detection of change from LOS to NLOS (or from NLOS to LOS)),

[0184] Position (detection of position change (movement)),

[0185] The loss function corresponding to the deployed AI model,

[0186] Accuracy / performance metrics (e.g., NMSE),

[0187] CSI (e.g., L1-RSRP, L1-SINR).

[0188] The threshold used for the above condition may also be a threshold related to the above metric (eg, a BLER threshold, an MCS threshold).

[0189] The MFM setting may also include the MFD resource setting. With respect to the MFD standard, measurements corresponding to the MFD standard may be performed for one or more (e.g., all) of the MFD resources set by the MFD resource setting, and when the measurement result satisfies the condition corresponding to the MFD standard, the MF instance counter may be sent to the MAC layer.

[0190] Figure 8 This is a diagram showing an example of the occurrence of MFD. Figure 8 The process is equivalent to Figure 7 The present invention is an example of processing of "condition determination" of . In this example, as information related to MFD, it is assumed that the MFD standard is set to "BLER>Threshold 1", the MF instance maximum counter is set to "five times", and the MFD timer is set to "10 time slots". In this example, notifications exchanged between the L1 (PHY) layer and the L2 (MAC) layer are shown.

[0191] If BLER>threshold 1 occurs, the L1 layer notifies the MAC layer of the MF instance. If the number of received MF instances reaches five or more, the MAC layer determines that MFD has occurred and notifies the L1 layer of the MCR sending instruction. In addition, during the period until the notification of the MCR sending instruction, the candidate model selection described later can also be implemented.

[0192] The MFM setting may also include more than one set of information related to the above-mentioned MFD. Each set may also be associated with different type information. The MFM setting may also include type information corresponding to each set.

[0193] Fig. 9 1 is a diagram showing an example of a plurality of sets of information related to MFD. In this example, it is assumed that set 1 corresponding to type X, set 2 corresponding to type Y, and set 3 corresponding to type Z are set by MFM setting. The MFD standard, MF instance maximum counter, and MFD timer of set i (i=1-3) are represented as MFD standard i, MF instance maximum counter i, and MFD timer i, respectively.

[0194] The cell-specific encoder is preferably not a triggering object of the MCR. Therefore, the MFD criteria of set 1 may also represent criteria that cannot occur (e.g., BLER>1, BLER<0, etc.). In addition, the MF instance maximum counter and MFD timer of set 1 may also be arbitrary values, which may be set or ignored, or may not be set originally.

[0195] The region-specific encoder may also trigger the MCR frequently, and the channel-specific encoder may also trigger the MCR less frequently. Therefore, the MFD standard of set 2 may also be a standard that is more likely to occur than the MFD standard of set 3.

[0196] In addition, when multiple sets of information related to MFD are set, the UE may activate / deactivate the set through MAC CE / DCI. In addition, when multiple sets of information related to MFD are set, the UE may activate the set based on the type information corresponding to the set / selected encoder (the set corresponding to the encoder that is not set / selected may also be deactivated). The UE may also detect MF only based on the activated set.

[0197] [Candidate model selection]

[0198] When MFD occurs, the UE may select (determine) a model that is a candidate for change from the current model (candidate model).

[0199] The PHY layer of the UE may also perform measurements corresponding to the criteria for candidate model selection, and send a notification to the MAC layer indicating that a candidate model has been found when the measurement results satisfy the conditions corresponding to the criteria for candidate model selection.

[0200] The criteria for candidate model selection may also be the same as the MFD criteria described above. The UE may also be configured with information related to one or more models that are candidate models through high-layer signaling. The information related to the model may also include a (candidate) model ID, information related to the criteria described above, and the like.

[0201] In addition, the MCR can be triggered when more than one candidate model is found, or when no candidate model is found.

[0202] When one or more candidate models are found, the UE may apply (use) any one of the one or more candidate models within a certain period after the MCR is sent, without waiting for a response / instruction / model setting from the base station.

[0203] [MCR content]

[0204] The content of the MCR (the information included in the MCR) may also be configured through high-layer signaling. For example, the UE may also be configured with configuration information (MCR configuration) for the MCR through high-layer signaling, and the MCR configuration may also include information related to the content of the MCR (information related to which information is included in the MCR). The configuration of information related to the content of the MCR may also be referred to as model change configuration (MC configuration).

[0205] The information related to the content of the MCR may also be at least one of the following:

[0206] A candidate model ID or a list of candidate model IDs,

[0207] The measurement results (values ​​of the metrics) corresponding to the criteria for candidate model selection,

[0208] the current status of the model (of which the MF is detected) (e.g. the value of at least one of the above metrics),

[0209] Channel characteristic information (see the first embodiment),

[0210] Information related to model updates.

[0211] The information related to the above model update may also include information related to at least one of the following:

[0212] The updated weight value in the current model / candidate model (this may be either an absolute value or a relative value),

[0213] Updated model structure,

[0214] the value of the loss function for the model being updated,

[0215] No candidate models found.

[0216] [Uplink resources for MCR]

[0217] The UE may also send the MCR in the nearest uplink resource after the MCR is triggered.

[0218] The UE may be configured with MCR configuration including information related to uplink resources used for the MCR through higher layer signaling, or may be scheduled with uplink resources through DCI.

[0219] The information related to the uplink resources used for the MCR may also include information related to at least one of the following:

[0220] ·MCR periodicity,

[0221] The time to stop sending MCR,

[0222] The number of MCR attempts,

[0223] Time / frequency resources for sending MCR.

[0224] The UE may periodically send the MCR based on the MCR period from the timing when the MCR is triggered (or the first MCR is sent) to the time when the MCR transmission is stopped.

[0225] In addition, the time for stopping the MCR transmission can be represented by the number of times the MCR is transmitted (which can also be called a transmission counter) or by a time period (for example, the number of time slots, the number of seconds). In addition, the time for stopping the MCR transmission can also be equivalent to the period for monitoring the response to the MCR transmission (which can also be called a response window, a monitoring window, etc.). The response can also be a model change command (Model Change Command (MCC)) described later in the fourth embodiment.

[0226] After the MCR is sent, the UE may monitor the downlink channel (PDCCH, PDSCH, etc.) in the search space during X symbols / time slots / milliseconds. The UE may also monitor the search space repeatedly Y times. In addition, the "MCR transmission" may be the first transmission or the i-th transmission (i is an integer).

[0227] The UE may determine X and Y based on specific rules / UE capabilities, or may be notified from the network using physical layer signaling (e.g., DCI), high layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels, or a combination thereof. X and Y may also be different for each SCS (e.g., the SCS that activates the BWP), frequency band (e.g., the frequency band to which the activated BWP belongs, the frequency range, etc.).

[0228] In addition, the MFM setting, the MC setting, and the MCR setting may be set separately.

[0229] According to the third embodiment described above, the UE can appropriately send the MCR.

[0230] <Fourth embodiment>

[0231] The fourth embodiment relates to a change in the model.

[0232] The UE may also be notified of the model change indication from the network using physical layer signaling (eg, DCI), higher layer signaling (eg, RRC signaling, MAC CE), a specific signal / channel, or a combination thereof.

[0233] The model change instruction may also be referred to as a model change command (MCC).

[0234] The MCC may also include information indicating at least one of the following:

[0235] Permission (ACKnowledgement (ACK)) corresponding to the candidate model (recommended model) indicated by MCR (see the third embodiment),

[0236] AI models,

[0237] Type information associated with the above-mentioned AI model (see the second embodiment).

[0238] The above permission may also be referred to as confirmation.

[0239] The application of the model corresponding to MCC will be described later in the fifth embodiment.

[0240] In addition, the UE may also implicitly determine (the receipt of) an ACK for the MCR based on (based on the occurrence of) the following:

[0241] • PDCCH reception with a DCI format scheduling a PUSCH transmission with the same Hybrid Automatic Repeat reQuest (HARQ) process number as a PUSCH transmission containing an MCR, and with a new data indicator (NDI) field value toggled.

[0242] In addition, the MCC may include at least one of the MFM setting, the MC setting, and the MCR setting for a confirmed model / a set new model.

[0243] According to the fourth embodiment described above, the UE can appropriately understand the MCC.

[0244] <Fifth Embodiment>

[0245] A fifth embodiment relates to the timing of application of the model.

[0246] The UE may also apply the model confirmed by the confirmation in the fourth embodiment after at least one of the following timings:

[0247] Reference time

[0248] The time after adding the time offset to the reference time.

[0249] For example, the UE may start applying the confirmed model from the first symbol / slot after the timing (for example, the first UL symbol / slot).

[0250] The reference time may also be at least one of the following:

[0251] · PDCCH / PDSCH reception timing including MCC,

[0252] Report the PUCCH / PUSCH transmission timing of the HARQ-ACK information (or ACK) for the MCC.

[0253] The above time offset can also be expressed using one or more of the following:

[0254] Number of code elements,

[0255] Number of time slots,

[0256] Number of subframes,

[0257] Seconds (eg, milliseconds, microseconds, etc.).

[0258] The UE may determine the time offset based on a specific rule / UE capability, or may be notified from the network using physical layer signaling (e.g., DCI), high layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel, or a combination thereof. For example, with respect to the time offset, when no setting related to the time offset is made from the network, it may be a default value (e.g., 3 ms).

[0259] The time offset may be a common value for all UEs, or may be determined for each specific band.

[0260] Fig.10 is a diagram showing an example of a process until the application of a model after MCC reception in the fifth embodiment. Figure 7 Likewise, no repeated description will be given.

[0261] The UE receives the permitted MCC of the candidate model indicated by the MCR. In this example, the reference time is the reception timing of the MCC. After the time offset has passed from the reference time, the UE applies the MCC (the candidate model permitted by the MCC).

[0262] According to the fifth embodiment described above, the UE can apply the model at appropriate timing.

[0263] <Supplement>

[0264] In the above embodiment, an example is shown in which the UE has an encoder and the base station has a decoder. The above embodiment can also be applied to an example in which the UE has a decoder and the base station has an encoder.

[0265] The encoder / decoder in the above-mentioned implementation mode may also be rewritten with the AI ​​model equipped in the UE / base station. That is, the present disclosure is not limited to the case of using an automatic encoder, but may also be applied to the case of using any model for inference. In addition, the object compressed by the UE / base station using the encoder in the present disclosure is not limited to CSI (or channel / precoding matrix), but may be any information. In this case, the channel information in the above-mentioned implementation mode may also be simply rewritten as information.

[0266] At least one of the above-mentioned implementation modes may also be applied only to a UE that reports a specific UE capability (UE capability) or a UE that supports the specific UE capability.

[0267] The specific UE capability may also represent at least one of the following:

[0268] Supporting processing / operation / control / information for at least one of the above embodiments (e.g., encoder for AI-assisted information transmission),

[0269] Supports acquisition / reporting of channel characteristic information (e.g., LOS, NLOS, location information),

[0270] Support multiple AI models corresponding to different types (type information),

[0271] Supports levels of computational complexity.

[0272] The above-mentioned UE capabilities can be reported per frequency, per frequency range (for example, Frequency Range 1 (FR1)), Frequency Range 2 (FR2), FR2-1, FR2-2), per cell, or per subcarrier spacing (SubCarrier Spacing (SCS)).

[0273] The above UE capabilities may be reported commonly for time division duplex (TDD) and frequency division duplex (FDD), or may be reported independently.

[0274] In addition, at least one of the above-mentioned embodiments may also be applied when the UE is set with specific information associated with the above-mentioned embodiments through high-layer signaling. For example, the specific information may also be information indicating activation of the use of the AI ​​model for CSI feedback, any RRC parameter for a specific version (e.g., Rel.18), etc.

[0275] In addition, at least one of the above-mentioned embodiments may also be used for transmission (compression) of information between UE and base station other than CSI feedback. For example, the UE may also report information related to position (or positioning) / information related to position estimation in the location management function (LMF) to the network in accordance with at least one of the above-mentioned embodiments (for example, generated using an encoder). The information may also be information on the channel impulse response (Channel Impulse Response (CIR)) for each subband / each antenna port. If they are reported, the base station can estimate the position of the UE even if the angle / time difference of the received signal is not reported.

[0276] (Note)

[0277] The following inventions are added to one embodiment of the present disclosure.

[0278] [Note 1]

[0279] A terminal having:

[0280] A control unit that obtains channel information based on the measurement; and

[0281] A sending unit is configured to send the channel information and channel characteristic information associated with the channel information.

[0282] [Note 2]

[0283] The terminal described in Supplement 1,

[0284] The channel characteristic information includes information related to at least one of Line Of Site (LOS), Non-Line Of Site (NLOS), and location.

[0285] [Note 3]

[0286] The terminal described in Supplement 1 or Supplement 2 further comprises:

[0287] a receiving unit, receiving type information indicating a type for an encoder,

[0288] The control unit compresses the transmitted information using an encoder determined based on the type information.

[0289] [Note 4]

[0290] The terminal described in any one of Notes 1 to 3 further comprises:

[0291] a receiving unit, receiving type information indicating a type related to an application range of the encoder,

[0292] The control unit compresses the transmitted information using an encoder determined based on the type information.

[0293] (Note)

[0294] The following inventions are added to one embodiment of the present disclosure.

[0295] [Note 1]

[0296] A terminal having:

[0297] The control unit uses the set encoder to compress the information to be sent; and

[0298] The sending unit sends a request to change the encoder when a certain condition is met.

[0299] [Note 2]

[0300] The terminal described in Supplement 1,

[0301] The case where the condition is satisfied is a case where a model failure is detected for the encoder.

[0302] [Note 3]

[0303] The terminal described in Supplement 1 or Supplement 2 further comprises:

[0304] The receiving unit receives a permission corresponding to the change request.

[0305] [Note 4]

[0306] The terminal described in any one of Notes 1 to 3 further comprises:

[0307] a receiving unit, receiving a permission corresponding to the change request,

[0308] The control unit starts using the new encoder based on the timing of receiving the permission.

[0309] (Wireless Communication System)

[0310] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0311] Fig.11 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0312] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0313] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (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.

[0314] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0315] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in 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 in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0316] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0317] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (lower than 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0318] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0319] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0320] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0321] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0322] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. 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. may be used.

[0323] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0324] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and the like may be used.

[0325] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used as uplink channels.

[0326] The PDSCH transmits user data, high-layer control information, system information block (SIB), etc. The PUSCH transmits user data, high-layer control information, etc. In addition, the PBCH transmits the master information block (MIB).

[0327] The PDCCH may also transmit lower layer control information. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0328] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0329] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0330] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may 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" and the like in the present disclosure may also be rewritten mutually.

[0331] Through PUCCH, uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.) and scheduling request (SR) can also be transmitted. Through PRACH, random access preambles for establishing a connection with a cell can also be transmitted.

[0332] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0333] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, 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. may also be transmitted as DL-RS.

[0334] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0335] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0336] (Base Station)

[0337] Fig.12 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0338] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0339] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0340] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0341] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0342] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0343] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0344] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0345] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0346] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0347] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0348] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0349] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0350] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0351] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0352] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0353] 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 and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0354] In addition, the transmitting and receiving unit 120 may also transmit information related to the report of the channel information to the user terminal 20. The transmitting and receiving unit 120 may also receive the channel information and channel characteristic information associated with the channel information from the user terminal 20.

[0355] Furthermore, the transmitting and receiving unit 120 may transmit the setting information of the encoder to the user terminal 20. The transmitting and receiving unit 120 may receive a request to change the encoder transmitted from the user terminal 20 when a certain condition is satisfied.

[0356] (User Terminal)

[0357] Fig.132 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0358] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0359] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0360] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and 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 and reception unit 220.

[0361] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0362] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0363] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0364] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0365] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0366] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0367] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0368] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0369] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0370] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0371] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0372] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received 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.

[0373] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0374] In addition, the control unit 210 may also obtain the channel information based on the measurement. The transmitting and receiving unit 220 may also transmit the channel information and the channel characteristic information associated with the channel information.

[0375] The channel characteristic information may also include information related to at least one of line of sight (Line Of Site (LOS)), non-line of sight (Non-Line Of Site (NLOS)), and location.

[0376] The transmitting and receiving unit 220 may also receive type information indicating the type used for the encoder. The control unit 210 may also compress the information to be transmitted using the encoder determined based on the type information.

[0377] The transmitting and receiving unit 220 may also receive type information indicating a type related to an application range of the encoder. The control unit 210 may also use the encoder determined based on the type information to compress the information to be transmitted.

[0378] In addition, the control unit 210 may also use the set encoder to compress the information to be transmitted. The transmitting and receiving unit 220 may also send a request to change the encoder when a certain condition is met.

[0379] The condition may be satisfied when a model failure is detected for the encoder.

[0380] The sending and receiving unit 220 may also receive a permission corresponding to the change request.

[0381] The transmitting and receiving unit 220 may receive a permission corresponding to the change request. The control unit 210 may start using the new encoder based on the timing of receiving the permission.

[0382] (Hardware Structure)

[0383] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0384] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0385] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.14 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0386] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be interchangeably used. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0387] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0388] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations 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 1003.

[0389] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0390] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned 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 operated in the processor 1001, and the same can be implemented for other functional blocks.

[0391] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or 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 executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0392] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0393] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (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-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0394] The input device 1005 is an input device that receives 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 implements 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 an integrated structure (e.g., a touch panel).

[0395] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0396] 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 the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0397] (Variation Example)

[0398] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0399] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0400] Here, the parameter set may also be a communication parameter 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 a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transmitter and receiver in the frequency domain, a specific windowing process performed by a transmitter and receiver in the time domain, and the like.

[0401] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0402] A time slot may also include 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 fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0403] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0404] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0405] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0406] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0407] In addition, when a time slot or a mini time slot is called 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 of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0408] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0409] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be rewritten as a TTI with a TTI length shorter than that of the long TTI and longer than 1 ms.

[0410] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0411] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0412] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0413] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0414] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0415] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0416] At least one of the set BWPs may be activated, and the UE may not assume that it will transmit or receive a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0417] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0418] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0419] In the present disclosure, the names used for parameters, etc. are not restrictive in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not restrictive in all respects.

[0420] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0421] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0422] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0423] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-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.

[0424] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (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 establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0425] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0426] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0427] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0428] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0429] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0430] 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", and "panel" can be used interchangeably.

[0431] In the present disclosure, terms such as "Base Station (BS)", "wireless 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", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0432] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0433] In the present disclosure, the base station sending information to the terminal may also rewrite the base station instructing the terminal to perform control / action based on the information.

[0434] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0435] There are also cases where a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client or several other appropriate terms.

[0436] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving object, a moving object body, etc.

[0437] The mobile body refers to a movable object, and the moving speed is arbitrary, and of course it also includes the situation where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, automatic two-wheeled vehicles, bicycles, networked cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trailers, rickshaws, ships (ships and other watercrafts), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quadcopters, balloons and objects carried by them, and are not limited to these. In addition, the mobile body can also be a mobile body that moves autonomously based on operating instructions.

[0438] The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0439] Fig.151 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 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 rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0440] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handlebar), and performs steering of 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.

[0441] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, 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 ECU (Electronic Control Unit).

[0442] The signals from the various sensors 50-58 include a current signal from a current sensor 50 for sensing the current of the motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58, and the like.

[0443] The information service unit 59 is composed of various devices such as a car navigation system, an audio system, a speaker, a display, a television, and a radio for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information obtained from an external device via the communication module 60, etc. to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0444] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0445] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents before they happen or reducing the driver's driving load, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning device (for example, Global Navigation Satellite System (GNSS)), map information (for example, high-precision (High Definition (HD))) map, autonomous vehicle (Autonomous Vehicle (AV)) map, etc.), gyroscope system (for example, inertial measurement unit (Inertial Measurement Unit (IMU))), inertial navigation unit (Inertial Navigation System (INS))), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 and realizes driving assistance function or autonomous driving function.

[0446] The communication module 60 can communicate with the microprocessor 61 and the components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift 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 the various sensors 50-58 of the vehicle 40 via the communication port 63.

[0447] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received between external devices via wireless communication. 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, 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 user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0448] The communication module 60 may also transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted through the communication module 60 may also include information based on the above input.

[0449] The communication module 60 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from an external device, and displays it to the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0450] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used 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 shift 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., which are provided in the vehicle 40 based on the information stored in the memory 62.

[0451] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink", "downlink", etc. may also be rewritten as terms corresponding to communication between terminals (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0452] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0453] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node (uppernode) depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering the Mobility Management Entity (MME)), the Serving-Gateway (S-GW), etc., but not limited to these) or a combination thereof.

[0454] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0455] The various modes / implementations described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or a decimal)), 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)), IEEE802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these enhancements, corrections, generation or regulations, etc. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0456] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0457] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0458] The term "determining" used in the present disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0459] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0460] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0461] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0462] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0463] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, being "connected" or "combined" to each other using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc.

[0464] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0465] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0466] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0467] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A control unit that obtains channel information based on the measurement; and A sending unit is configured to send the channel information and channel characteristic information associated with the channel information.

2. The terminal according to claim 1, wherein: The channel characteristic information includes information related to at least one of line of sight (LOS), non-line of sight (NLOS), and location.

3. The terminal according to claim 1, wherein: The terminal further comprises: a receiving unit, receiving type information indicating a type used for the encoder, The control unit compresses the transmitted information using an encoder determined based on the type information.

4. The terminal according to claim 1, wherein: The terminal further comprises: a receiving unit, receiving type information indicating a type related to an application range of the encoder, The control unit compresses the transmitted information using an encoder determined based on the type information.

5. A wireless communication method of a terminal, comprising: The step of obtaining channel information based on the measurement; and The step of sending the channel information and channel characteristic information associated with the channel information.

6. A base station, comprising: a sending unit, sending information related to the report of the channel information to the terminal; and A receiving unit receives the channel information and channel characteristic information associated with the channel information from the terminal.

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