CN117751609A - Terminal, wireless communication method and base station - Google Patents

Abstract

The terminal according to one aspect of the present disclosure includes: a receiving unit that calculates a radio link quality corresponding to one or more reference signals; and a control unit configured to control a channel state information (Channel State Information (CSI)) report to include information on a predicted radio link quality at a future time calculated based on the radio link quality. According to an aspect of the present disclosure, suitable channel estimation/resource utilization can be achieved.

Description

Terminal, wireless communication method and base station

Technical Field

The present disclosure relates to a terminal, a wireless communication method, and a base station in a next generation mobile communication system.

Background

In a universal mobile telecommunications system (Universal Mobile Telecommunications System (UMTS)) network, long term evolution (Long Term Evolution (LTE)) is standardized for the purpose of further high-speed data rates, low latency, and the like (non-patent document 1). Further, for the purpose of further large capacity, high altitude, and the like of LTE (third generation partnership project (Third Generation Partnership Project (3 GPP)) Release (rel.)) versions 8 and 9, LTE-Advanced (3 GPP rel.10-14) has been standardized.

Subsequent systems of LTE (e.g., also referred to as fifth generation mobile communication system (5 th generation mobile communication system (5G)), 5g+ (plus), sixth generation mobile communication system (6 th generation mobile communication system (6G)), new Radio (NR)), 3gpp rel.15 later, and the like are also being studied.

Prior art literature

Non-patent literature

Non-patent document 1:3GPP TS 36.300V8.12.0"Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); overall description; stage 2 (Release 8) ", 4 th year 2010

Disclosure of Invention

Problems to be solved by the invention

For future wireless communication technologies, there is a study on flexible use of artificial intelligence (Artificial Intelligence (AI)) technology such as Machine Learning (ML)) in control, management, and the like of networks and devices. For example, AI-assisted beam management using AI-assisted estimation (AI-assisted estimation) is being studied.

However, with respect to the specific content of AI-assisted beam management, research has not been progressed. If these cannot be properly defined, high-accuracy channel estimation and efficient resource utilization cannot be achieved, and there is a concern that improvement in communication throughput and communication quality may be suppressed.

It is therefore an object of the present disclosure to provide a terminal, a wireless communication method, and a base station capable of achieving suitable channel estimation/resource utilization.

Means for solving the problems

The terminal according to one aspect of the present disclosure includes: a receiving unit that calculates a radio link quality corresponding to one or more reference signals; and a control unit configured to control a channel state information (Channel State Information (CSI)) report to include information on a predicted radio link quality at a future time calculated based on the radio link quality.

Effects of the invention

According to an aspect of the present disclosure, suitable channel estimation/resource utilization can be achieved.

Drawings

Fig. 1 is a diagram showing an example of an enhanced beam report with prediction.

Fig. 2 is a diagram showing an example of enhanced beam reporting for AI-assisted beam management.

Fig. 3A to 3C are diagrams showing examples of the existing CSI correlation amount and the new CSI correlation amount according to the first embodiment.

Fig. 4 is a diagram showing another example of the existing CSI correlation amount and the new CSI correlation amount according to the first embodiment.

Fig. 5A to 5E are diagrams showing an example of the phase information according to the first embodiment.

Fig. 6A and 6B are diagrams illustrating an example of evaluation of radio link quality according to the second embodiment.

Fig. 7 is a diagram showing another example of evaluation of radio link quality according to the second embodiment.

Fig. 8 is a diagram illustrating an example of an RS used for calculating the CSI correlation amount according to the second embodiment.

Fig. 9 is a diagram showing an example of conditional beam reporting using PUCCH according to the third embodiment.

Fig. 10 is a diagram showing an example of the beam report MAC CE according to the third embodiment.

Fig. 11 is a diagram showing an example of the beam report MAC CE according to the third embodiment.

Fig. 12 is a diagram showing an example of the beam report MAC CE according to the third embodiment.

Fig. 13 is a diagram illustrating an example of an RS used for calculating the CSI correlation amount according to the third embodiment.

Fig. 14A and 14B are diagrams showing an example of control of whether or not the beam report according to the third embodiment is triggered.

Fig. 15A and 15B are diagrams showing an example of selection of the reported RS according to the fourth embodiment.

Fig. 16 is a diagram showing an example of RRC parameters indicating a selection policy according to the fourth embodiment.

Fig. 17A and 17B are diagrams showing an example of the range and the number of bits of L1-RSRP according to the fifth embodiment.

Fig. 18 is a diagram showing an example of control of the predicted beam report association according to the seventh embodiment.

Fig. 19A and 19B are diagrams showing an example of quantized predicted CSI time information.

Fig. 20A and 20B are diagrams showing an example of the length of time that can be used for prediction.

Fig. 21 is a diagram showing an example of calculation of prediction accuracy according to the seventh embodiment.

Fig. 22 is a diagram showing an example of calculation of prediction accuracy according to the seventh embodiment.

Fig. 23 is a diagram showing an example of calculation of future prediction accuracy information according to the seventh embodiment.

Fig. 24 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 25 is a diagram showing an example of a configuration of a base station according to an embodiment.

Fig. 26 is a diagram showing an example of a configuration of a user terminal according to an embodiment.

Fig. 27 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment.

Detailed Description

(application to Artificial Intelligence (Artificial Intelligence (AI)) technology for Wireless communication)

For future wireless communication technologies, there is a study on flexible use of AI technology in control, management, etc. of networks/devices.

For example, in future wireless communication technologies, particularly in communication using beams, it is desired to improve the accuracy of channel estimation (which may also be referred to as channel measurement) for beam management, decoding of received signals, and the like.

The channel estimation may be performed using at least one of a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a synchronization signal (Synchronization Signal (SS)), a synchronization signal/broadcast channel (synchronization signal/physical broadcast channel (Synchronization Signal/Physical Broadcast Channel (SS/PBCH))) block, a demodulation reference signal (DeModulation Reference Signal (DMRS)), a measurement reference signal (sounding reference signal (Sounding Reference Signal (SRS))), and the like, for example.

In the conventional wireless communication technology, a large amount of estimation resources (for example, resources for transmitting reference signals) are required for performing channel estimation with high accuracy, and it is necessary to perform channel estimation for all antenna ports to be used. When resources such as DMRS and CSI-RS are increased for realizing high-precision channel estimation, resources for data transmission and reception (for example, downlink shared channel (physical downlink shared channel (Physical Downlink Shared Channel (PDSCH))) resources and uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH)) resources)) are reduced.

In addition, in the conventional wireless communication technology, control based on the current or past measurement results is completed, but when the wireless quality is deteriorated and the link is disconnected, delay is caused.

In the future, it is studied to realize high-precision channel estimation with fewer resources and prediction of future measurement by using AI technology such as Machine Learning (ML). Such channel estimation may also be referred to as AI-assisted estimation (AI-assisted estimation). Beam management using AI-assisted estimation may also be referred to as AI-assisted beam management.

As an example of AI-assisted beam management, when AI is utilized in a terminal (also referred to as a User terminal, user Equipment (UE)), or the like), AI may also predict future beam measurement values. In addition, the UE may also trigger a predicted enhanced beam failure recovery (enhanced beam failure recovery (enhancement BFR (enhanced BFR))).

As an example of AI-assisted beam management, when AI is used in a Base Station (BS), AI may estimate (derive) a measurement value of a fine beam based on a small number of beam management, or may predict a future measurement value of a beam (for example, a measurement value of a fine beam). In addition, the UE may also receive a beam indication with a time offset.

However, with respect to the specific content of AI-assisted beam management, research has not been progressed. If these cannot be properly defined, high-accuracy channel estimation and efficient resource utilization cannot be achieved, and there is a concern that improvement in communication throughput and communication quality may be suppressed.

Accordingly, the inventors of the present invention have conceived appropriate beam reporting for AI-assisted beam management. In addition, embodiments of the present disclosure may also be applied without utilizing AI/prediction.

In an embodiment of the present disclosure, the UE/BS performs training of the ML model in a training mode (training mode), and implements the ML model in a test mode (also referred to as test mode), test mode (testing mode), or the like. In the test mode, verification (validation) of the accuracy of the ML model (trained ML model) trained in the training mode is performed.

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

In addition, in the present disclosure, AI may also be replaced with an object (also referred to as an object, data, function, program, or the like) having (implementing) at least one of the following features:

Based on the estimation of the observed or collected information,

based on the selection of the observed or collected information,

prediction based on observed or collected information.

In the present disclosure, the object may be, for example, a terminal, a base station, or other device, equipment, or the like. The object may correspond to a program included in the apparatus.

Furthermore, in the present disclosure, the ML model may also be replaced with an object having (implementing) at least one of the following features:

by being provided with information (feeding), generating an estimate,

by being provided with information, predictive estimates,

by being provided with information, the discovery feature,

by being provided with information, select operation.

Further, in the present disclosure, the ML model may also be replaced with at least one of an AI model, a predictive analysis (predictive analytics), a predictive analysis model, and the like. In addition, the ML model may also be derived using at least one of regression analysis (e.g., linear regression analysis, multiple regression analysis, logistic regression analysis), support vector machines, random forests, neural networks, deep learning, and the like. In the present disclosure, the model may also be replaced with at least one of an encoder, a decoder, a tool, etc.

The ML model outputs information of at least one of an estimated value, a predicted value, a selected operation, a classification, and the like based on the input information.

The ML model may include supervised learning (supervised learning), unsupervised learning (unsupervised learning), reinforcement learning (Reinforcement learning), and the like. Supervised learning may also be used to learn general rules that map inputs to outputs. Unsupervised learning may also be used in order to learn the characteristics of the data. Reinforcement learning may also be used for learning operations for maximizing purposes (endpoints).

The embodiments described below will be described mainly assuming that Supervised learning is used in the ML model, but are not limited thereto.

Implementations, operations, executions, etc. may also be interchanged in this disclosure. In addition, in the present disclosure, test, post-training (after-training), formal use, actual use, and the like may also be replaced with each other. Signals may also be interchanged with signals/channels.

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 test mode may also correspond to a mode (in other words, an operation mode during the test) in which the UE/BS implements the ML model (e.g., implements the trained ML model to predict the output).

In the present disclosure, the training mode may also mean a mode in which a specific signal transmitted in the test mode is transmitted with a large overhead (e.g., a large amount of resources).

In the present disclosure, the training mode may also mean a mode that refers to a first setting (e.g., a first DMRS setting, a first CSI-RS setting). In the present disclosure, the test mode may also mean a mode in which a second setting (e.g., a second DMRS setting, a second CSI-RS setting) different from the first setting is referred to. The first setting may set at least one of time resources, frequency resources, code resources, and ports (antenna ports) related to measurement more than the second setting.

Embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. The radio communication methods according to the embodiments may be applied individually or in combination.

In the following embodiments, for explaining the ML model related to communication between the UE and the BS, the relevant subjects are the UE and the BS, but the application of the embodiments of the present disclosure is not limited thereto. For example, for communication between other subjects (for example, communication between UEs), the UEs and BSs of the following embodiments may be replaced with the first UE and the second UE. In other words, the UEs, BSs, etc. of the present disclosure may be replaced with any UE/BS.

In the present disclosure, "a/B", "at least one of a and B" may also be replaced with each other.

In the present disclosure, activation, deactivation, indication, selection, setting, update, decision, and the like may be replaced with each other. In the present disclosure, support, control, enable control, operate, enable operation, and the like may also be interchanged.

In the present disclosure, radio resource control (Radio Resource Control (RRC)), RRC parameters, RRC messages, higher layer parameters, information Elements (IEs), settings may also be interchanged. In the present disclosure, the media access control (Medium Access Control) control element (MAC control element (MAC Control Element (CE))), update command, activation/deactivation command may also be replaced with each other.

In the present disclosure, a panel, a UE panel, a panel group, a beam group, a precoder, an Uplink (UL)) transmitting entity, a TRP, spatial Relationship Information (SRI), a spatial relationship, an SRS resource identifier (SRS resource indicator (SRS Resource Indicator (SRI))), an SRS resource, a control resource set (COntrol REsource SET (CORESET)), a physical downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a codeword, a base station, a specific antenna port (e.g., a demodulation reference signal (DeModulation Reference Signal (DMRS)) port), a specific antenna port group (e.g., a DMRS port group), a specific group (e.g., a code division multiplexing (Code Division Multiplexing (CDM)) group, a specific reference signal group, a CORESET group), a specific resource (e.g., a specific reference signal resource), a specific resource set (e.g., a specific reference signal resource set), a coresi pool, a PUCCH group (PUCCH resource group), a spatial relationship group, a downlink TCI state (TCI state), an Uplink TCI state (TCI state), a uniform TCI state (TCI state), a TCI state (QCL), a common TCI state (TCI), a common state (tcl), and the like are also contemplated.

In this disclosure, the index, ID, indicator, resource ID may also be replaced with each other. In this disclosure, sequences, lists, sets, groups, clusters, subsets, etc. may also be substituted for each other.

In the present disclosure, beam reporting may also be replaced with beam measurement reporting, CSI measurement reporting, predicted beam reporting, predicted CSI reporting, time-offset beam reporting, and the like.

In the present disclosure, the CSI-RS may also be replaced with at least one of a Non Zero Power (NZP) CSI-RS, a Zero Power (ZP) CSI-RS, and a CSI interference measurement (CSI Interference Measurement (CSI-IM)).

In the present disclosure, the RS being measured/reported may also mean the RS being measured/reported for beam reporting.

(Wireless communication method)

In the following embodiments, the UE may also report predicted beam measurement CSI (which may also be referred to as a predicted enhanced beam report) to the network. In addition, the UE may also report enhanced beam measurement CSI for AI-assisted beam management to the network (may also be referred to as enhanced beam reporting for AI-assisted beam management). Hereinafter, the enhanced beam report and the beam report may be replaced with each other.

Fig. 1 is a diagram showing an example of an enhanced beam report with prediction. In this example, the BS transmits two RSs (RS #1, # 2), and the UE with AI predicts the beam quality at time t=1 in the future based on the beam measurement (L1-RSRP measurement) at time t=0. The RS may be, for example, CSI-RS or SSB.

The UE reports the predicted beam measurements. In addition, the UE may also report current (actual, t=0) beam measurements along with predicted (t=1) beam measurements.

Fig. 2 is a diagram showing an example of enhanced beam reporting for AI-assisted beam management. In this example, the BS transmits the RS using four relatively coarse beams. The UE selects the beam measurements to report for high accuracy AI-based beam estimation (in other words, appropriate for such estimation). Furthermore, the UE may also send beam measurement reports only if necessary (the UE may also trigger beam measurement reports).

The UE may also include not only L1-RSRP/SINR but also information appropriate for AI-assisted beam management in the beam measurement report.

The BS with AI may also estimate/predict the best beam for the UE based on the received beam measurement report (a relatively small number of beam measurements).

In addition, in the present disclosure, timing, time, slot, sub-slot, symbol, sub-frame, etc. may also be replaced with each other.

The following embodiments relate to the content, processing, transmission timing, and the like of these beam reports.

< first embodiment >, first embodiment

The first embodiment relates to CSI correlation quantity (CSI related quantity).

In the first embodiment, the UE may report a different CSI association amount (hereinafter, for simplicity, also referred to as a new CSI association amount) from the CSI association amount (hereinafter, for simplicity, also referred to as an existing CSI association amount) supported in the existing rel.15/16NR specification by including the CSI association amount in the beam report.

The existing CSI association amount may 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)), an SS/PBCH block resource Indicator (SS/PBCH Block Indicator (SSBRI)), a Layer Indicator (LI)), a Rank Indicator (RI)), a Layer 1 (L1)) -reference signal received power (Reference Signal Received Power (RSRP)) (reference signal received power in Layer 1), an L1-signal-to-interference-plus-noise ratio (Signal to Interference plus Noise Ratio (SINR)), and the like, for example.

The new CSI association amount may also be replaced with the CSI association amount for AI-assisted beam management, enhanced CSI association amount, etc.

In addition, in the present disclosure, the existing CSI-related amount is assumed (replaced) to be L1-RSRP/SINR for explanation as long as it is not specifically mentioned later. In other words, L1-RSRP may also be interchanged with L1-SINR, existing CSI correlation amounts, etc.

The UE may report the new CSI association with the existing CSI association or separately (e.g., using different time/frequency resources).

Whether to transmit the new CSI association amount may be determined based on a specific rule, may be set to the UE using physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may be determined based on UE capability. For example, the UE may also be set with a measurement report of the existing/new CSI-related quantity by an RRC parameter (e.g., reportquality) for setting the reported CSI-related quantity.

[ New CSI correlation quantity ]

The new CSI-related quantity may also contain phase/amplitude information of the RS being measured. The UE may report the calculated phase/amplitude at a certain time or the calculated phase/amplitude in the latest RS. The phase/amplitude information may also show complex values representing the phase and the amplitude.

The new CSI related quantity may also contain information of a time (time to measure RS) at which the RS is measured for CSI calculation. This time may correspond to the time/timing at which the UE refers to the RS for CSI calculation, and may be, for example, a time difference from the transmission timing of the beam report. This information may also represent RS resources of the measured RS instead of/together with time.

The new CSI correlation amount may also contain spatial information (spatial information) (may also be referred to as spatial information) of the RS being measured.

The spatial information may include spatial relationship information, TCI status, and the like, or may include information that does not match these.

The spatial information may also include at least one of:

information about the Angle of Arrival (AoA) of the RS being measured,

information about the spatial correlation (spatial correlation) of the RS being measured,

information about the UE panel used in the reception of the measured RS,

information indicating whether RS can be received simultaneously.

The information related to the AoA may include at least one of a degree (degree) of the AoA, a radian (radius) of the AoA, an angular spread (angular spread) of the AoA, and the like with respect to the RS to be measured. The angle of arrival may also be referred to as the reception angle.

The information related to the spatial correlation may include information related to spatial correlation between the measured RS and other RSs, or may include information related to spatial correlation between the measured RSs when there are a plurality of measured RSs.

The above-described information related to the spatial correlation may also be reported, for example, in a case where beams of an existing CSI correlation amount (e.g., L1-RSRP) reported by the measurement UE are different among reported (or measured) RSs.

The information related to the spatial correlation may also indicate a spatial correlation of the reported RS with respect to the RS that achieved the maximum L1-RSRP.

The information related to the spatial correlation may be two values of correlation (correlated)/uncorrelation (uncorrelated), a value representing a correlation coefficient (or degree of correlation), information related to the QCL/TCI state/spatial relationship, information representing the influence of fading, information representing the variance value (or standard deviation) of the AoA, information representing the reciprocal of the variance value/standard deviation, or information representing a plurality of these pieces of information.

The UE may decide the number of beam measurements to report per beam based on a specific rule, may decide the number of beam measurements to report per beam based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals/channels, or a combination thereof, or may decide the number of beam measurements to report per beam based on UE capability.

The information related to the UE panel may include, for example, a panel ID. The above-described information on the UE panel may also be reported, for example, in case that the panel measuring the existing CSI related quantity (e.g., L1-RSRP) reported by the UE is different between reported (or measured) RSs.

The UE may decide the number of beam measurements reported per panel based on specific rules, physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals/channels, or a combination thereof, or the UE capability.

The information indicating whether or not the RSs can be received simultaneously may be information indicating a beam pair that can be received simultaneously (or cannot be received simultaneously), or may include a plurality of RS indexes (or RS setting indexes). The information indicating whether or not the RS can be simultaneously received may include information on whether or not the measured RS and other RSs can be simultaneously received, or information on whether or not a plurality of measured RSs can be simultaneously received.

The new CSI association may also contain location information of the UE. The location information of the UE may also include at least one of information (e.g., latitude, longitude, altitude) obtained using a positioning system such as a global positioning system (Global Positioning System (GPS)), information of a base station adjacent to (or in service with) the UE (e.g., an identifier (Identifier (ID)) of a base station/cell, a distance between BS and UE, a direction of the UE viewed from the BS, coordinates (e.g., coordinates of X/Y/Z axes) of the UE or BS viewed from the BS or UE, a specific address (e.g., an internet protocol (Internet Protocol (IP)) address) of the UE, and the like. The location information of the UE is not limited to information based on the location of the BS, and may be information based on a specific point.

The location information of the UE may also contain information related to its implementation (e.g., location/position (location/position))/orientation of antennas, location/orientation of antenna panels, number of antennas, number of antenna panels, etc.).

The new CSI association may also contain mobility information.

The mobility information may include information indicating at least one of the mobility type, the location information of the UE, the movement speed of the UE, the acceleration of the UE, the movement direction of the UE, and the like.

Here, the mobility type may correspond to at least one of a fixed location UE (fixed location UE), a mobile/mobile UE (mobile UE), no mobility UE (no mobility UE), low mobility UE (low mobility UE), medium mobility UE (middle mobility UE), high mobility UE (high mobility UE), a cell-edge UE (cell-edge UE), a non-cell-edge UE (non-cell-edge UE), and the like.

The UE may determine the location information/mobility information based on at least one of the measurement result of the RS and the acquisition result of the location information/moving speed/acceleration.

In addition, in the present disclosure, the position information/mobility information may be acquired by the UE/base station based on a satellite positioning system (for example, global navigation satellite system (Global Navigation Satellite System (GNSS)), global positioning system (Global Positioning System (GPS)), or the like), or acquired/corrected based on the UE-UE communication/UE-base station communication (for example, may be determined based on a doppler shift (or QCL-related parameter) of a reference signal transmitted from the base station, or the like).

The UE may determine the granularity of the location information/mobility information based on specific rules, may determine the granularity of the location information/mobility information based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals/channels, or a combination thereof, or may determine the granularity of the location information/mobility information based on UE capabilities.

Fig. 3A to 3C are diagrams showing examples of the existing CSI correlation amount and the new CSI correlation amount according to the first embodiment. In this example, the UE measured RS #1- #3. Fig. 3A shows L1-RSRP measurements of RS #1- #3, and fig. 3B shows the phase (angle from the positive direction of the real axis in the complex plane). In fig. 3B, the amplitudes are all normalized with the radius of the unit circle for simplicity.

Fig. 3C shows an example of beam reporting for rs#1 to #3 corresponding to fig. 3A and 3B. In fig. 3A, L1-RSRP is from high to low in the order of RS #3, #1, #2, so the existing CSI-related amount/new CSI-related amount of each RS may also be included in the beam report in this order.

In addition, in the present disclosure, the RS index may also be CRI, SSBRI, or the like. In addition, in the following, in the present disclosure, the CSI association amount may also be replaced with an existing CSI association amount/a new CSI association amount.

In fig. 3C, the maximum rs#3 is shown as an absolute value (40 dBm) and the other RSs are shown as a differential value (differential RSRP) from the value of rs#3 with respect to L1-RSRP.

Fig. 3C shows the value corresponding to fig. 3B as a Phase (Phase).

Fig. 3C shows, as spatial information, information related to the spatial relationship with the first RS (here, rs#3). For example, there is shown a correlation for rs#1 and no correlation for rs#2. In addition, in the present disclosure, "N/a" may be replaced with "Not applied", "Not Applicable", "Not Available", "Not valid", or the like.

The new CSI association quantity may also contain a Block Error Rate (BLER) related to the measured RS (e.g., BLER corresponding to a hypothetical (downlink) PDCCH transmission).

[ value of New CSI correlation quantity ]

The UE may report the value of the new CSI association amount for a certain RS based on an absolute value or based on a relative value (or differential value). The CSI-related quantity included in the beam report may be a bit string expressing the absolute value/differential value or an index related to the absolute value/differential value.

The UE may also report a value of the new CSI association amount for a certain RS included in the beam report based on a differential value from the value of the new CSI association amount for the first RS. Here, the first RS may be an RS corresponding to the first entry (or field) included in the beam report, an RS whose index (e.g., resource index, set index, etc.) is the smallest or largest among RSs reported by the beam report, or an RS corresponding to the smallest or largest value among existing CSI-related quantities (e.g., L1-RSRP) reported by the beam report.

The UE may report the value of the new CSI association amount for a certain RS included in the beam report based on a difference value from the value of the new CSI association amount reported previously for the certain RS. The "certain RS" may be "each RS". In this case, it is also conceivable that the beam report does not include information of a new CSI-related amount expressed in absolute value for any RS. In addition, in the present disclosure, "previously reported" may mean "newly reported" or "reported before j times (j is an integer). In the present disclosure, the UE may report other reported information/parameters such as the existing CSI association amount based on a differential value from the previously reported information/parameters.

The value of the new CSI association amount may also have a different bit width (size) in the case of being reported based on an absolute value and in the case of being reported based on a differential value.

The new CSI association amount may also be reported according to different granularity (may also be referred to as a minimum unit of reporting, step size (Step size), etc.) per RS. The UE may determine granularity of the new CSI association based on either a specific rule, physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or based on UE capabilities.

The UE may determine granularity of the new CSI-related amount according to the absolute value/differential value of the new CSI-related amount, or may determine granularity of the new CSI-related amount according to the position/order of the new CSI-related amount in the beam report.

Fig. 4 is a diagram showing another example of the existing CSI correlation amount and the new CSI correlation amount according to the first embodiment. This example also shows an example of beam reporting for RS #1- #3 corresponding to fig. 3A and 3B.

The phases of the RSs are reported based on absolute values in fig. 3C, but are reported based on the difference of the first RS (rs#3) in fig. 4. Here, the granularity of the phase is assumed to be pi/6. In fig. 4, the phase of rs#1 is pi/3-pi/6= +pi/6, and the phase of rs#2 is represented as-pi/4-pi/6= -5 pi/12 ∈ -pi/2 (rounded based on granularity).

The phase information may be represented by a bit string in which signal points (constellation points (constellation point)) are sequentially associated with binary numbers. For example, in the case where the phase information is expressed by X bits, N of the decimal number may also be allocated as n×2pi/2 ^X 。

The phase information may be expressed by gray codes so that Hamming distances (Hamming distances) between adjacent signal points are minimized. In the case of using the gray code, the influence of errors in the case of generating bit errors can be appropriately suppressed.

Fig. 5A to 5E are diagrams showing an example of the phase information according to the first embodiment. Fig. 5A shows a method of combining a 2-bit binary number with each signal point (phase=n×2pi/2 ^X X=2) are associated. Fig. 5B shows an example of gray coding of fig. 5A.

Fig. 5C shows a 3-bit binary number and each signal point (phase=n×2pi/2 ^X X=3) was associated. Fig. 5D shows an example of gray coding of fig. 5C.

In the case where the phase information shown in the left table of fig. 5E is reported using the bit expression of fig. 5D, the bits shown in the right table of fig. 5E may also be used.

According to the first embodiment described above, for example, the UE can appropriately report the CSI association amount useful for beam management using AI.

< second embodiment >

The second embodiment relates to conditional beam reporting (conditional beam report).

In a second embodiment, the UE transmits a beam report if a condition is satisfied. Thus, the overhead of less useful beam reporting can be reduced while maintaining high quality beam management. Therefore, the number of beam reports can be reduced, and power required for transmission by the UE can be saved.

In addition, in the present disclosure, the conditional beam report may also be referred to as a UE triggered beam report (or measurement) or the like. In the present disclosure, "conditions" not specifically mentioned may be conditions for conditional beam reporting (conditions described in the second embodiment, reporting conditions).

Note that, the RS satisfying the condition may be independent of whether or not the condition is satisfied for the RS. In other words, although a certain RS satisfies the condition, the reporting condition is not necessarily satisfied.

The conditional beam reporting may also be reported periodically/semi-continuously/aperiodically. The UE may determine the condition periodically/semi-continuously/aperiodically, transmit a beam report if the condition is satisfied, and not transmit a beam report if the condition is not satisfied (transmission may be skipped/canceled).

The UE may also decide whether to report a beam report based on the radio link quality. The UE may also be set up with RS resources for calculating the radio link quality. The RS resource may be an RS resource for conditional beam reporting or the same as an RS resource used for calculation of the existing CSI correlation amount.

The UE may also compare the measured radio link quality to a threshold to evaluate and decide whether to report a beam report.

In addition, in the present disclosure, the radio link quality may be either L1-RSRP or hypothesized (downlink) L1-RSRP, or a BLER transmitted by hypothesized (downlink) PDCCH, or any CSI-related quantity.

Fig. 6A and 6B are diagrams illustrating an example of evaluation of radio link quality according to the second embodiment. In fig. 6A, the UE may also check (check) whether the calculated measurement (calculated measurement) exceeds the threshold of L1-RSRP, or may report on the exceeded RS by beam reporting. In this example, the UE may report the rs#1 and the rs#3 by beam reporting. The UE may evaluate the calculated radio link quality of the RS to which the existing CSI related amount has been reported for the threshold value.

In addition, in the present disclosure, the calculated measurement may be either a current measurement (radio link quality) or a future predicted measurement (based on the current measurement).

In fig. 6B, the UE may calculate a difference between the calculated measurement and the previously reported measurement (previous reported measurement), check whether the difference exceeds a threshold, and report the exceeding RS by beam reporting. In this example, since the difference between rs#1 and rs#3 is equal to or smaller than the threshold, the UE does not report by beam reporting. For RS #2 where there is no previously reported measurement, the ue may report through beam reporting regardless of the threshold, or may report through beam reporting if the threshold is exceeded.

Fig. 7 is a diagram showing another example of evaluation of radio link quality according to the second embodiment. In fig. 7, the UE may detect whether or not the index of the RS that realizes the X maximum beams (maximum (best) radio link quality) is changed, and if so, report the RS that realizes the X maximum beams after the change (i.e., in the calculated measurement) by beam reporting. In this example, if x=2, the largest two beams in the measurement reported before are rs#1 and #2, and the largest two beams in the measurement calculated are rs#1 and #3. In this case, the UE may report the rs#1 and the rs#3 by beam reporting. In other words, if the X maximum beams are unchanged from the previous report, the transmission of the beam report may also be omitted.

In the description, it is assumed that, if there is one RS having a radio link quality satisfying the condition, the UE transmits a beam report including the existing/new CSI related amount for the RS, and if there is no one, the UE does not transmit the control of the beam report, but the present invention is not limited thereto. For example, for a group of RSs (e.g., a group of RSs set as targets of conditional beam reporting), the UE may transmit a beam report containing the existing/new CSI-related amount for all RSs in the set as long as there is one RS with a radio link quality that satisfies the condition. The method for selecting the RS index to be reported will be described later in the fourth embodiment.

The UE may determine the threshold value, X, or the like based on a specific rule, may determine the threshold value, X, or the like based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may determine the threshold value, X, or the like based on UE capability.

The threshold value, X, and the like may be set and determined for each RS or may be set and determined for each RS group. For example, when the transmission power is different for each RS, the threshold is preferably set for each RS.

The UE may decide to be able (or unable) to use the most recent (most) RSs for beam measurement (or beam reporting) based on a specific rule, may decide to be able (or unable) to use the most recent (most) RSs for beam measurement (or beam reporting) based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals/channels, or a combination thereof, and may decide to be able (or unable) to use the most recent (most) RSs for beam measurement (or beam reporting) based on UE capabilities. The UE may derive the calculated measurement based on the measurement result (for example, averaging) of the latest RSs set/determined as the number of beam measurements (or beam reports) available.

The UE may decide, based on certain rules, what kind of nearest RS can (or cannot) be used for beam measurement (or beam reporting), may decide, based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), certain signals/channels, or a combination thereof, what kind of nearest RS can (or cannot) be used for beam measurement (or beam reporting), or may decide, based on UE capabilities, what kind of nearest RS can (or cannot) be used for beam measurement (or beam reporting). The UE may determine that the RS up to the period (e.g., slot, subframe, second) set/determined to be usable for beam measurement (or beam report) is valid (valid) for the radio link quality, and derive the calculated measurement based on the RS up to the period reported by the beam report (beam report).

[ RS used for calculating CSI-related quantity ]

The UE may decide what RS to use in the calculation of the CSI-related amount based on a specific rule, may decide what RS to use in the calculation of the CSI-related amount based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may decide what RS to use in the calculation of the CSI-related amount based on UE capability.

The UE may also calculate the reported CSI correlation based on at least one of:

period a: RS before or after the condition is satisfied,

period B: RS before a scheduling request (Scheduling Request (SR)) for beam reporting is transmitted,

period C: RS before receiving PDCCH (DCI) of a scheduling beam report,

period D: all available RSs before the beam report are transmitted.

In addition, as for the period D, the thresholds Z and Z' (or CSI calculation time) as described in the seventh embodiment described later may be considered.

Fig. 8 is a diagram illustrating an example of an RS used for calculating the CSI correlation amount according to the second embodiment. In this example, the following procedure is shown: the UE measures the SSB/CSI-RS, and as a result, the SR is transmitted using the PUCCH resource, and accordingly, the PDCCH scheduling the PUSCH is transmitted from the base station, and finally, the PUSCH including the beam report is transmitted from the UE.

Fig. 8 shows SSB/CSI-RS corresponding to the above-described period a-D.

According to the second embodiment described above, the conditional beam report can be appropriately transmitted.

< third embodiment >

A third embodiment relates to conditional beam reporting (conditional beam report).

In the second embodiment, the condition of the conditional beam reporting is described, and in the third embodiment, the configuration of the beam reporting is described. That is, in the case where the condition of the second embodiment is satisfied, the UE may also transmit a beam report using the structure of the third embodiment.

[ CSI (CSI on PUCCH) on PUCCH ]

The UE may also use the PUCCH to transmit a conditional beam report (such transmission is also referred to as CSI (CSI on PUCCH) on PUCCH). In this case, the conditional beam reporting may correspond to CSI part 1/part 2 or to a new CSI part.

The UE may determine PUCCH resources for conditional beam reporting based on a specific rule, may determine PUCCH resources for conditional beam reporting based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may determine PUCCH resources for conditional beam reporting based on UE capability.

The UE may decide whether to accommodate (or transmit) the beam report only when the condition is met based on a specific rule, may decide whether to accommodate (or transmit) the beam report only when the condition is met based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, and may decide whether to accommodate (or transmit) the beam report only when the condition is met based on UE capability. In addition, regarding whether or not to accommodate (or transmit) the beam report only when the condition is satisfied, the beam report may be set for each CSI report (or CSI report setting), or may be set for each report setting type (RRC parameter reportconfigtype. Periodic/semi-persistent/non-periodic).

Fig. 9 is a diagram showing an example of conditional beam reporting using PUCCH according to the third embodiment. In this example, a periodic conditional beam report is shown, and when the condition is satisfied, the UE transmits a beam report to the PUCCH resource, and when the condition is not satisfied, does not transmit a beam report.

[ CSI (CSI on PUSCH) on PUSCH ]

The UE may also use PUSCH to transmit a conditional beam report (such transmission is also referred to as CSI (CSI on PUSCH) on PUSCH). In this case, the conditional beam report may correspond to CSI part 1/part 2, may correspond to a new CSI part, or may be transmitted using a MAC CE.

In the case where the condition is satisfied, the UE may trigger a MAC CE indicating a beam report using PUSCH (hereinafter, simply referred to as a beam report MAC CE). In other words, when the condition is satisfied, the UE may trigger an SR for scheduling PUSCH for transmitting the beam report MAC CE. The UE may also be set (provided) a scheduling request ID for beam reporting MAC CE through higher layer signaling.

The UE may transmit the MAC CE using the PUSCH when the PUSCH is scheduled after the SR transmission. In addition, in the case where the condition is satisfied, and in the case where the PUSCH that can be used next has been scheduled, the UE may transmit the MAC CE using the PUSCH without transmitting the SR.

Here, the PUSCH scheduling may correspond to the dynamic grant PUSCH scheduling based on DCI, or may correspond to the activation of (the setting of) the configuration grant PUSCH based on RRC signaling (and DCI).

The beam report MAC CE may also contain at least one of the following information (fields):

information indicating the Cell in which the measurement was performed (information indicating a serving Cell index, a Secondary Cell (SCell)) index, whether or not it is a Special Cell (SpCell),

Information (e.g., RS index) representing the RS being measured,

information indicating the type of RS index (e.g., CRI or SSBRI),

information representing the existing CSI related quantity (e.g., L1-RSRP) being measured,

information representing the new CSI-related quantity measured,

information representing the selection policy,

information indicating the amount of time offset,

information indicating whether a certain octet (octet) is present in the MAC CE,

information indicating that is reported through the MAC CE for several measured RS resources (in other words, information of the report number),

information representing the bit width of the existing/new CSI-related quantity,

information indicating what existing/new CSI-related quantity is contained.

The RS index may also correspond to an index of CSI-RS/SSB resources where the UE measured the existing/new CSI correlation.

The selection strategy and the time offset will be described in the embodiments described later.

Fig. 10 is a diagram showing an example of the beam report MAC CE according to the third embodiment. The MAC CE may include a serving cell ID (Serving Cell ID) field, BWP ID field, F field, RS index field, C field, measurement value field, and the like.

The serving cell ID field may be a field for indicating the serving cell in which the measurement was made. The BWP ID field may also be a field for indicating DL BWP where measurement is performed.

The F field may also represent the type of the subsequent RS index field. For example, if the value of the F field is '1', the RS index field represents a CSI-RS index (CSI-RS resource index), and if the value of the F field is '0', the RS index field represents an SSB index.

The measurement value field may also represent a value related to a specific existing/new CSI association quantity. The measurement value field may also be replaced with the CSI association quantity field.

The C field may also indicate whether an RS index field/measurement value field exists after the C field. For example, if the value of the C field is '1', it means that there is an octet containing the RS index field/measurement value field after the C field, and if the value of the C field is '0', it may also mean that there is no octet containing the RS index field/measurement value field after the C field.

The UE may also perform control of transmitting the beam report MAC CE in the case of reporting the activated beam report MAC CE.

[ Beam report size of MAC CE ]

The UE may also set a different maximum RS number (e.g., measured RS number) per CSI-RS resource set through higher layer signaling for reporting of the beam reporting MAC CE. With this configuration, the size of the MAC CE can be easily adjusted.

The UE may set the number of RSs to be reported (the number of measurement RSs) for reporting the beam report MAC CE through higher layer signaling. According to this configuration, the RS index field can be easily adjusted in size, and the MAC CE can be prevented from becoming large in size.

The UE may also set granularity of the CSI-related amount/CSI-related amount to be reported for reporting of the beam reporting MAC CE through higher layer signaling. According to this configuration, the size of the MAC CE and the reported measurement quality can be balanced.

Fig. 11 is a diagram showing an example of the beam report MAC CE according to the third embodiment. The MAC CE may include a report number field. In this example, the same contents as those in fig. 10 may be omitted (in the following drawings, the description is omitted).

In fig. 11, the size of the RS index field is reduced (6 bits→4 bits) as compared with fig. 10. By setting the maximum number of RSs to be monitored (measured), the size of the RS index field can be suppressed. Further, with respect to the initial CSI association amount field of fig. 11 being 7 bits, the remaining CSI association amount field is reduced to 4 bits. In this way, granularity of the CSI-related amount may be set/determined differently from other CSI-related amounts among the CSI-related amounts corresponding to the first RS.

The UE may also determine that the size of the beam report MAC CE is fixed (predetermined), or may determine based on at least one of:

the maximum set number of RSs for reporting CSI-related quantities,

the set number of RSs for reporting the CSI-related quantity,

the type/kind of CSI association (e.g., what CSI association is),

granularity of the CSI-related quantity,

the field of the MAC CE.

For example, in the case where the (maximum) set number of RSs is X (X is an integer), the octet number indicating a bit field indicating whether or not the CSI-related amount corresponding to the RS exists in the MAC CE may be represented by ceil (X/8). In addition, ceil represents an upward rounding function.

In addition, the bit width of the CSI-related amount field may also be determined based on granularity, type, etc. of the CSI-related amount. The bit width of the RS index field may also be determined based on the (maximum) number of RSs set.

The field of the MAC CE may correspond to at least one of:

the number of fields indicating RS resources that should be reported (e.g., the number of fields indicating whether the CSI-related amount associated with the RS of the corresponding RS index is contained in 1 bit of the MAC CE),

Information indicating whether or not a certain octet is present in the MAC CE (e.g., the C field described above),

a field (or report number field) indicating the number of CSI associations to be reported.

The UE may include, for example, in the beam reporting MAC CE, an octet indicating the CSI association amount, which indicates the number of CSI association amounts indicated by the field indicating the number of CSI association amounts to be reported.

Fig. 12 is a diagram showing an example of the beam report MAC CE according to the third embodiment. The MAC CE contains C _i A field. C (C) _i The field may also correspond to a bit field (e.g., if '1') indicating whether or not the CSI association amount corresponding to the RS corresponding to the i-th (here, i=0 to 7) RS index exists in the MAC CE. C (C) _i The number of fields may also be determined according to the (maximum) number of RSs that are set. According to C _i And a field in which the number of CSI-related amount fields included in the MAC CE varies.

In addition, the size of the CSI-related amount field may also be determined based on granularity, type, etc. of the CSI-related amount.

The beam reporting MAC CE described so far may be replaced with the CSI reporting. The CSI report may also be applied to the CSI report transmitted in UCI (UCI on PUCCH) on the PUCCH described above. For example, the UE may transmit a CSI report including information corresponding to various fields included in the beam report MAC CE as a beam report.

[ RS for calculation of CSI-related quantity ]

The UE may also calculate the reported CSI correlation amount based on RSs during at least one of:

period a: the most recent (or latest) RS that satisfies the condition,

period b: the first one or more RSs that satisfy the condition,

period c: regardless of whether the condition is satisfied, the most recent (or most up-to-date) RS.

In addition, as for the period c, the thresholds Z and Z' (or CSI calculation time) as described in the seventh embodiment described later may be considered.

The UE may decide to calculate the CSI correlation based on the measurement results of several RSs based on a specific rule, may decide to calculate the CSI correlation based on the measurement results of several RSs based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may decide to calculate the CSI correlation based on the measurement results of several RSs based on UE capability.

Fig. 13 is a diagram illustrating an example of an RS used for calculating the CSI correlation amount according to the third embodiment. In this example, the following procedure is shown: the UE measures the SSB/CSI-RS, and as a result, the SR is transmitted using the PUCCH resource, and accordingly, the PDCCH scheduling the PUSCH is transmitted from the base station, and finally, the PUSCH including the beam report is transmitted from the UE. In addition, the above condition is not satisfied after the PDCCH is received and before the PUSCH is transmitted.

Fig. 13 shows SSB/CSI-RS corresponding to the period a-c described above. In period a, the latest RS is included when viewed from the point in time when the condition is no longer satisfied.

The UE may apply the decision of the beam report based on at least one of the periods a to c to both PUCCH and PUSCH.

[ condition of SR/MAC CE for not triggering Beam reporting ]

The UE may not trigger SR/MAC CE (PUSCH transmission) for beam reporting when at least one of the following conditions is satisfied:

at the time of triggering, the condition is no longer satisfied,

after a certain period of time has elapsed after the condition is satisfied,

the specific period elapses from the reception of the RS used for the measurement that satisfies the condition (or the RS that satisfies the condition).

Fig. 14A and 14B are diagrams showing an example of control of whether or not the beam report according to the third embodiment is triggered. This example is similar to fig. 13, but differs in that the period of PUCCH resources is long.

In fig. 14A, although the temporary reporting condition is satisfied, the reporting condition is not satisfied before the triggering of the SR afterwards, and thus the UE cancels the triggering of the SR.

In fig. 14B, if the temporary report condition is satisfied, a timer starts. Then the timer expires (a certain period elapses) before the SR is triggered, and thus the UE cancels the triggering of the SR.

According to the third embodiment described above, the conditional beam report can be appropriately transmitted.

< fourth embodiment >, a third embodiment

A fourth embodiment relates to the selection of reported beam measurements.

In the fourth embodiment, the UE may not include all the measurement results for the RS index set as the reporting target for the beam reporting in the beam reporting.

The UE may also select the reported beam measurements based on the set RRC parameters. The UE may select an RS index (corresponding to L1-RSRP) for beam reporting based on the set RRC parameter or a specific rule.

For example, the UE may also select an RS index for beam reporting based on at least one of the following selection methods:

selection method 1: the RS index that is randomly determined is used,

selection method 2: the RS index of the largest L1-RSRP is achieved,

selection method 3: with the RS index of the L1-RSRP that differs the most compared to the previously reported L1-RSRP,

selection method 4: the oldest reported RS index of the latest L1-RSRP (in other words, the longest period of no reporting of the L1-RSRP).

The base station receiving the beam report including the RS index achieving the maximum L1-RSRP can find the RS corresponding to the maximum L1-RSRP from among the measured RSs.

A base station receiving a beam report containing an RS index having an L1-RSRP that differs most from a previously reported L1-RSRP can appropriately track rapid changes in L1-RSRP for all measured RSs.

The base station receiving the beam report containing the oldest RS index reporting the latest L1-RSRP can properly track the newer measured values of L1-RSRP for all measured RSs.

The UE may also include the measurement results (e.g., CSI correlation amount, the RS index, etc.) for the selected RS index in the beam report for transmission. In addition, when reporting a plurality of RS indexes, the UE may determine an RS index to be reported by, for example, selecting a first RS index from among the RS indexes that can be reported using beam reporting, based on the selection method, and selecting a second RS index from among the remaining RS indexes excluding the first RS index from among the RS indexes that can be reported, based on the selection method, ….

Fig. 15A and 15B are diagrams showing an example of selection of the reported RS according to the fourth embodiment. This example is similar to fig. 7 and so on, and thus a repetitive description will not be made. In fig. 15A, among three measured RSs (RS #1- # 3), the RS having the L1-RSRP with the largest difference from the L1-RSRP reported before is RS #2, and therefore, the UE can also perform control to include the L1-RSRP of RS #2 in the beam report for reporting.

In fig. 15B, among the three measured RSs (RS #1- # 3), the oldest RS reported by the latest L1-RSRP is RS #2 (L1-RSRP reported previously does not exist), and therefore, the UE can also perform control to report the L1-RSRP of RS #2 by including it in the beam report.

The UE may also select a selection method of the RS index for beam reporting based on RRC parameters (e.g., selection policy) indicating a selection policy.

Fig. 16 is a diagram showing an example of RRC parameters indicating a selection policy according to the fourth embodiment. This example is described using abstract syntax notation 1 (Abstract Syntax Notation One (asn.1)) notation (further, since this is merely an example, there is a possibility that it is not a complete description). In this figure, the meaning is of course understood to a person skilled in the art for the RRC information element/parameter of the same name as the RRC information element/parameter already specified in the specification of rel.15/16NR (TS 38.331).

In the present disclosure, names such as RRC information element and RRC parameter are not limited to this, and for example, suffixes (for example, "_r18", "-r18", etc.) indicating the meaning of being introduced through specific resources may be added. The suffix may not be added, and other words may be added.

The RRC parameter indicating the selection policy may also be included in a CSI report setting (CSI-ReportConfig information element). The RRC parameter indicating the selection policy may be included in parameters (cri-RSRP, ssb-Index-RSRP, cri-SINR-r16, ssb-Index-SINR-r 16) corresponding to the reporting amount of L1-RSRP/SINR, or in RRC parameters (groupBasedBeamReporting) related to the group-based beam reporting. The RRC parameter indicating the selection policy may be set to be included in other RRC parameters and information elements.

In fig. 16, the RRC parameter indicating the selection policy is an enumerated value of any one of the values { random, largest, diffence, oldest, hybrid }. Here, random, largest, difference, oldest may also represent the above-described selection methods 1 to 4, respectively. The hybrid may also represent a combination of two or more of the above selection methods 1 to 4.

In addition, when an RRC parameter indicating a selection policy is not set for a certain CSI report, the UE may determine a selection method according to a default (or predetermined) selection policy (for example, any one of selection methods 1 to 4) for the CSI report.

According to the fourth embodiment described above, for example, the UE can appropriately report beam measurement values useful for beam management using AI.

< fifth embodiment >, a third embodiment

The fifth embodiment relates to granularity of CSI correlation amount.

The UE may also report CSI correlation amounts according to different granularity (e.g., step sizes of decibels (dB) · hereinafter, also simply referred to as step sizes) in beam reporting.

The UE may report the absolute values of a plurality of L1-RSRP in a beam report or may report a plurality of differential values from one absolute value. Here, the step sizes of the absolute value and the differential value, the step sizes of the plurality of absolute values, the step sizes of the plurality of differential values, and the like may also be different.

The UE may report an absolute value for the maximum L1-RSRP value and a differential value from the maximum L1-RSRP value for other L1-RSRP values in the beam report.

The UE may determine the step size of the L1-RSRP value based on a specific rule, may determine the step size of the L1-RSRP value based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may determine the step size of the L1-RSRP value based on UE capabilities.

For example, the UE may also be set with RRC parameters that represent the step size utilized in the beam report. For the absolute value and differential value of L1-RSRP in the beam report, the UE may be set either to the step size, respectively, or to a common (unified) step size.

In addition, the UE may also determine the step size of the L1-RSRP based on at least one of the various settings that occur in the first/second/third/fourth/sixth embodiment. For example, when a specific RRC parameter (e.g., selection policy=difference/oldest/hybrid) is set, the UE may decide to report L1-RSRP in accordance with a relatively small step size.

The UE may determine the step size of the L1-RSRP based on the range of the L1-RSRP value and the number of bits. The UE may determine the remaining one based on two of the range of L1-RSRP values, the number of bits of the L1-RSRP, and the step size of the L1-RSRP, if the two are set/specified.

The UE may also envisage that the range of maximum L1-RSRP values is always a first range (e.g., [ -140, -44] dbm) and the range of maximum L1-SINR values is always a second range (e.g., [ -23,40] dbm). In the present disclosure, the range may be defined by a maximum value and a minimum value, or by an average value (or a central value) and a maximum preferable difference from the value.

The UE may also envisage that the range of L1-RSRP values is a different range depending on the step size/number of bits.

The UE may determine the range of L1-RSRP values based on specific rules, may determine the range of L1-RSRP values based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals/channels, or a combination thereof, or may determine the range of L1-RSRP values based on UE capabilities.

The UE may also assume that the number of bits of the L1-RSRP value is always the same.

Furthermore, the UE may also assume that the number of bits of the L1-RSRP value is a different number of bits according to the step size/range.

The UE may determine the number of bits of the L1-RSRP value based on a specific rule, may determine the number of bits of the L1-RSRP value based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may determine the number of bits of the L1-RSRP value based on UE capability.

Fig. 17A and 17B are diagrams showing an example of the range and the number of bits of L1-RSRP according to the fifth embodiment.

Fig. 17A shows an example in the case where the range of L1-RSRP values differs according to the step size/bit number, and the bit number of L1-RSRP is the same regardless of the step size. Since the number of bits is the same, the range is also increased when the step size is relatively large, and is also decreased when the step size is relatively small.

Fig. 17B shows an example in the case where the ranges of L1-RSRP values are the same, and the number of bits of L1-RSRP differs according to the range/step. Since the ranges are the same, the number of bits becomes smaller when the step size is relatively large, and the number of bits becomes larger when the step size is relatively small.

According to the fifth embodiment described above, the UE can appropriately determine granularity of CSI association amount.

< sixth embodiment >

The sixth embodiment relates to beam reporting containing a large number of CSI-related quantities.

The maximum number of L1-RSRP values (or RS indices) included in the beam report may be determined based on the selection policy shown in the fourth embodiment and the range/number of bits/step of the L1-RSRP values shown in the fifth embodiment.

For example, in the case where the step size of the L1-RSRP of the beam report is doubled (or halved) compared to rel.15/16NR, the UE may be set to include 8L 1-RSRP values in the beam report.

The number of reported RSs in the beam report in the existing rel.15/16 standard is set by the RRC parameter nrofReportedRS, also shown in fig. 16. In the present disclosure, the RS number set by the nrofReportedRS may be extended from the existing maximum value of 4, and for example, 6, 7, 8, 10, etc. may be set.

The set RS number may be the maximum RS number included in the beam report, and the number of RSs reported by the beam report may be reduced from the maximum RS number, for example, as described in the fourth embodiment.

The UE may determine the number of L1-RSRP values (or RS indices) included in the beam report based on a specific rule, may determine the number of L1-RSRP values (or RS indices) included in the beam report based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may determine the number of L1-RSRP values (or RS indices) included in the beam report based on UE capability.

The UE may also decide the (maximum) number of CSI-related amounts included in the beam report based on whether the beam report is transmitted using UCI or the beam report is transmitted using MAC CE (beam report MAC CE). For example, the UE may also control such that more CSI-related amounts are reported in the case of reporting the MAC CE using the beam, as compared to the case of transmitting the beam report using UCI. This is to consider that PUSCH is more suitable for transmission of large-capacity data than PUCCH.

In addition, when the UE transmits the beam report using UCI, the UE may determine the (maximum) number of CSI-related amounts included in the beam report based on whether the UCI is transmitted using PUSCH or PUCCH.

According to the sixth embodiment described above, the UE can appropriately determine the number of CSI-related quantities included in the beam report.

< seventh embodiment >, a third embodiment

The seventh embodiment relates to predictive (predicted) beam reporting.

The UE may also report a predicted beam report containing estimated/predicted radio link quality in future time (may also be referred to as predicted CSI time, predicted timing, etc.) based on current/past RS measurements (radio link quality).

Fig. 18 is a diagram showing an example of control of the predicted beam report association according to the seventh embodiment. The UE monitors an RS (SSB/CSI-RS) and transmits a predicted beam report including a predicted radio link quality of a predicted CSI time after a time offset (time offset) from a certain timing.

Here, the certain timing may be a time when the predicted beam report is transmitted (may be referred to as a report opportunity (reporting occasion))), or a reception timing of a specific RS measured for prediction (for example, a last reception timing of a specific RS before transmission of the predicted beam report). The time shift amount in the former case corresponds to the illustrated period a, and the time shift amount in the latter case corresponds to the illustrated period B. This timing may also be referred to as a reference time (reference time).

The time offset may be expressed in, for example, a slot unit/symbol unit or a second unit (for example, a millisecond unit).

The UE may determine the time offset based on specific rules, based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals/channels, or a combination thereof, or based on UE capabilities.

The UE may also report the information related to the predicted CSI time contained in the predicted beam report.

In addition, in the present disclosure, the predicted CSI time and time offset may also be replaced with each other.

[ prediction CSI time ]

The UE may also report the quantized information of the predicted CSI time in a predicted beam report.

Fig. 19A and 19B are diagrams showing an example of quantized predicted CSI time information.

The UE may transmit a bit field indicating a selected one of the set time offsets as information for predicting CSI time. In fig. 19A, the UE assumes that four time offsets (12, 14, 16, and 18 slots) corresponding to each bit field are set using the RRC parameter.

In addition, when the UE is set with only one time offset, the predicted CSI time information may not be included in the predicted beam report (since the base station has knowledge of the time offset assumed by the UE).

The UE may transmit a bit field indicating a selected one of the predetermined time offsets as information for predicting CSI time. In fig. 19B, for example, four time offsets (2, 4, 6, and 8 slots) corresponding to each bit field may be specified in advance by specifications.

In the case where the UE processes the time offset, the UE may determine a time length (duration) that can be used for prediction based on the time offset. The predicted CSI time may also exist for more than one during this length of time.

In the present disclosure, in order to determine the time length, the UE may report/receive/decide/set the time offset and the window size instead of the time offset.

The UE may also predict the radio link quality at a particular point in time (e.g., a particular time slot) during the length of time specified by the time offset and window size.

In addition, in the present disclosure, in order to determine the above-described time length, the UE may report/receive/decide/be set two time offsets instead of one time offset.

The UE may also predict the radio link quality at a particular point in time (e.g., a particular time slot) during the length of time specified by the two time offsets.

Fig. 20A and 20B are diagrams showing an example of the length of time that can be used for prediction.

Fig. 20A shows an example in which the length of time is specified by the time offset and the window size. The length of time may also be at least one of the illustrated periods a-C. The period a is a period (period after the point) of window size width with a point (time T) determined by a time offset with reference to a reference time as a start time. The period B is a period of window size width (period before the point) with the point (time T) determined by the time offset with reference to the reference time as the end time. The period C is a period of the window size width (including a period before and after the point) with the point (time T) determined by the time offset with reference to the reference time as the center of the window size width.

Fig. 20B shows an example in which the time length is specified by two time offsets (first time offset, second time offset). The length of time may also be the duration of the illustration. The period is a period in which one of a point which is determined by the first time offset with reference to the reference time and a point which is determined by the second time offset with reference to the reference time is set as the start time, and the other is set as the end time. For example, if the second time offset (for example, Z slot) > the first time offset (for example, X slot), the length of the period can be expressed as Z-X.

[ content of predictive Beam report ]

The predicted beam report may include at least one of information (also simply referred to as CSI information, no predicted CSI information, etc.) included in the beam report/beam report MAC CE described in the third embodiment, or may include predicted information (also simply referred to as predicted CSI information, etc.) of a predicted CSI time for at least one of the CSI information.

In other words, the prediction beam report may include only the prediction CSI information, or may include both the no prediction CSI information and the prediction CSI information.

For example, in the predicted beam report, the CSI information may include information of an existing CSI related amount (L1-RSRP, etc.), information of a new CSI related amount, etc., and the predicted CSI information may include information of a predicted value of an existing CSI related amount, information of a predicted value of a new CSI related amount, etc.

The predicted beam report may also contain information for one or more points in time (e.g., multiple predicted CSI times). The UE may decide the number of time points of the reporting object (or included in the predicted beam report) based on a specific rule, the physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or the UE capability.

Regarding whether or not the non-predictive CSI information is included in the predictive beam report, the UE may be determined based on either specific rules, physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals/channels, or a combination thereof, or UE capabilities.

The UE may also include information related to whether specific CSI information included in the predicted beam report is non-predicted CSI information or predicted CSI information in the predicted beam report. For example, CSI information corresponding to the time offset may correspond to expected CSI information. The CSI information corresponding to time offset=0 and the CSI information not corresponding to time offset may correspond to the non-predictive CSI information.

The number of CSI information reported by the predicted beam may be determined based on a specific rule, based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or based on UE capability.

In the example shown in fig. 1, the UE may also include the non-predicted CSI information at time t=0 and the predicted CSI information at time t=1 in the predicted beam report and transmit the predicted beam report to the BS.

[ report of prediction accuracy ]

The UE may report information related to prediction accuracy of the prediction CSI information (hereinafter, also referred to as prediction accuracy information). The prediction accuracy information may include information (hereinafter, also referred to as "past prediction accuracy information") related to the accuracy of past predictions (past prediction Performance), or information (hereinafter, also referred to as "future prediction accuracy information") related to the expected accuracy of future predictions (expected Performance).

The past prediction accuracy information may be at least one of:

no predictive CSI information for the reported predictive CSI information,

information indicating whether the predicted error is contained within a certain range,

average performance error.

Here, the above-described non-predicted CSI information for the reported predicted CSI information may be equivalent to non-predicted CSI information based on measurement when the beam report including the predicted CSI information for a certain predicted CSI time is actually the predicted CSI time after the beam report is transmitted. In addition, the UE may report, as the non-predictive CSI information, a difference value from a predicted value indicated by the above-described reported predictive CSI information.

The information indicating whether the predicted error is included in a certain range may also indicate whether the error is included in a range of X% confidence interval (for example, x=95). The information may also be expressed in terms of Y bits (e.g., y=1). The predicted error can also be represented by, for example, an error (difference) between the predicted RSRP and the RSRP actually measured at that time.

The UE may decide the certain range based on a specific rule, may decide the certain range based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may decide the certain range based on UE capability.

The average performance error may be equivalent to average performance error information obtained by a certain time interval or a specific number of measurements.

The UE may determine the time interval or the number of measurements based on a specific rule, based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or based on UE capabilities.

Fig. 21 is a diagram showing an example of calculation of prediction accuracy according to the seventh embodiment. In this example, three predicted RSRPs and the RSRP actually measured at that moment are shown for the same RS #1 over time. The UE may calculate the average error of the measured RSRP and the predicted RSRP at three points in time during the illustrated period, and report the average error as an average performance error (past prediction accuracy information) to the base station.

The future prediction accuracy information may be at least one of:

expected difference between the predicted value (e.g., predicted RSRP) and the measured value (e.g., measured RSRP) used in the prediction of the predicted value,

information about the variance of the error of the predicted value and the actual value,

the range of Y% convergence of the prediction error,

average performance error.

For example, when the Y% error is within ±3dB, the UE may report ±3dB.

The UE may decide the Y based on specific rules, physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals/channels, or a combination thereof, or based on UE capabilities.

The average performance error may be equivalent to average performance error information obtained by a certain time interval or a specific number of measurements.

The UE may determine the time interval or the number of measurements based on a specific rule, based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or based on UE capabilities.

Fig. 22 is a diagram showing an example of calculation of prediction accuracy according to the seventh embodiment. In this example, for RSs corresponding to three RS indexes (RS #1- # 3), the respective prediction values and the range of 90% of the prediction error convergence are shown. As future prediction accuracy information, the UE may report information indicating the respective ranges.

The UE may report the prediction accuracy information for each RS index, may report the prediction accuracy information for each RS group, or may report the prediction accuracy information for each RS index.

The UE may determine the granularity of the expected precision (accuracy) based on a specific rule, may determine the granularity of the expected precision (accuracy) based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may determine the granularity of the expected precision (accuracy) based on UE capability.

[ timing of reporting of prediction precision information ]

Prediction accuracy information may also be reported periodically/semi-continuously/aperiodically. The transmission period of the prediction accuracy information may be the same as or different from the transmission period of the prediction beam report.

The UE may determine the period/timing of reporting of the prediction accuracy information based on a specific rule, may determine the period/timing of reporting of the prediction accuracy information based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may determine the period/timing of reporting of the prediction accuracy information based on UE capability.

The UE may report the prediction accuracy information if at least one of the following conditions is satisfied:

the calculated (or expected) error deviates X times from the specified range,

the calculated (or expected) error is greater or less than a threshold,

the difference between the reported error (the previously reported prediction accuracy information) and the calculated (or expected) error is greater than the threshold.

The UE may determine the specific range, the value of X, the threshold value, or the like based on a specific rule, may determine the specific range, the value of X, the threshold value, or the like based on physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or may determine the specific range, the value of X, the threshold value, or the like based on UE capability.

The prediction accuracy information may be reported in the prediction beam report or may be reported separately from the prediction beam report. The prediction accuracy information may be reported using, for example, a MAC CE for transmitting the prediction accuracy information.

For future prediction accuracy information, the UE may determine the accuracy of the prediction at the time point based on the time offset. The time offset may be set by RRC, or may correspond to the time offset included in the predicted beam report.

Fig. 23 is a diagram showing an example of calculation of future prediction accuracy information according to the seventh embodiment. In this example, the UE may derive the expected prediction accuracy of the predicted RSRP/SINR of the predicted CSI time after the time offset from the end of the last symbol of the monitored RS, and report the predicted RSRP/SINR using beam reporting.

According to the seventh embodiment described above, the UE can appropriately report the predicted beam report.

< eighth embodiment >, a third embodiment

The eighth embodiment relates to efficient beam reporting in the case where beam reporting in PUSCH is triggered based on CSI request field of DCI.

In the eighth embodiment, the UE may implement at least one of providing an effective CSI report (beam report) and updating CSI if the following conditions are satisfied:

The first uplink symbol of the transmission of the corresponding CSI report containing the influence of Timing Advance (Timing Advance) is from symbol Z _ref Beginning or after this, wherein symbol Z _ref Is defined as an uplink symbol after a threshold Z from the last symbol of the PDCCH triggering the beam report described above,

initial uplink symbol slave symbol Z 'transmitting nth CSI report including influence of timing advance' _ref Beginning or after, wherein symbol Z' _ref Is defined as the uplink symbol after a threshold Z' from the last symbol of the latest aperiodic CSI-RS resource.

The UE may determine at least one of the thresholds Z and Z' based on the values of the CSI calculation delay requirement tables (3GPP TS 38.214Table 5.4-1, 5.4-2) from the existing rel.15/16 NR.

The UE may determine at least one of the thresholds Z and Z' based on a value obtained by adding/multiplying a specific value (offset value) to/by a value from the CSI calculation delay requirement table in the existing rel.15/16 NR. The particular value may also correspond to an additional calculation time for the prediction.

If the UE has the prediction capability, the information about the additional calculation time may be reported as the UE capability information. The capability associated with the additional computation time may be selected from a plurality of candidates for computation time and reported. The UE may also assume a default calculation time without being reported the capability associated with the additional calculation time.

The UE may determine that at least one of the thresholds Z and Z' is a new value for beam reporting. The new value may be determined based on either a specific rule, physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel, or a combination thereof, or based on UE capabilities.

According to the eighth embodiment described above, for example, the UE can appropriately determine whether or not to provide a valid beam report.

< others >

The above embodiments may also be used in combination. For example, the predicted beam report of the seventh embodiment may correspond to the conditional beam report of the second/third embodiment. In this case, the terms of the second/third embodiment may also be replaced with terms that take into account predictions as appropriate. For example, the radio link quality in the second and third embodiments may be replaced with the predicted radio link quality, the CSI-related amount may be replaced with the predicted CSI-related amount, and the RS may be replaced with the RS used for prediction. Substitutions of terms in connection with the combination of such embodiments will be appropriately understood by those skilled in the art.

In the above embodiment, the L1-RSRP and the existing CSI related amount are described as being replaced with each other, but the L1-RSRP and the new CSI related amount may be replaced with each other. For example, according to the fifth embodiment, a different granularity may be determined for each new CSI association amount.

The RRC parameter (RRC setting) in the above embodiment may be included in, for example, CSI report setting (CSI-ReportConfig information element).

The beam measurements in the above-described embodiments may also be replaced with radio resource management (Radio Resource Management (RRM)) measurements. Furthermore, beam reporting may also be replaced with measurement reporting.

In the present disclosure, a predicted value is assumed to be described as a value, but the present invention is not limited to this. For example, the predicted value may be calculated as a probability density function (Probability Density Function (PDF))/cumulative distribution function (Cumulative Distribution Function (CDF)), or information necessary for indicating the PDF/CDF may be reported as the predicted CSI information.

At least one of the above embodiments may also be applied only to UEs reporting or supporting a specific UE capability (UE capability).

The particular UE capability may also represent at least one of:

Whether or not specific operations/information of embodiments are supported,

the maximum number of monitoring RSs for L1-RSRP/SINR calculation,

the maximum number of reports of L1-RSRP/SINR in CSI report,

step size of L1-RSRP/SINR that can be utilized in CSI reporting,

the available range of L1-RSRP/SINR values in CSI reports (max/min),

maximum time offset between the predicted value of CSI time and the RS or CSI report being measured,

maximum number of time points within one CSI report of the predicted CSI report,

processing time required for calculation/reporting of predicted values,

after the measured RS, the processing time for calculating the CSI-related amount (per CSI-related amount).

The UE capability may be reported for each Frequency, for each Frequency Range (e.g., frequency Range 1 (FR 1)), frequency Range 2 (FR 2)), FR2-1, FR 2-2), for each cell, or for each subcarrier interval (SubCarrier Spacing (SCS)).

The UE capability may be reported either in common by time division duplexing (Time Division Duplex (TDD)) or frequency division duplexing (Frequency Division Duplex (FDD)) or independently.

The UE capabilities described above may also be reported per CSI reporting type. The type of CSI report herein may also be at least one of CSI report using MAC CE, CSI report using UCI, periodic/semi-persistent/aperiodic CSI report, and the like.

At least one of the above embodiments may be applied when the UE sets specific information related to the above embodiments by higher layer signaling. For example, the specific information may be information indicating that the predicted beam report is activated, an arbitrary RRC parameter for a specific version (e.g., rel.18), or the like.

(Wireless communication System)

The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the embodiments of the present disclosure or a combination thereof.

Fig. 24 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication by using long term evolution (Long Term Evolution (LTE)) standardized by the third generation partnership project (Third Generation Partnership Project (3 GPP)), the fifth generation mobile communication system new wireless (5 th generation mobile communication system New Radio (5G NR)), or the like.

The wireless communication system 1 may support dual connection (Multi-RAT dual connection (Multi-RAT Dual Connectivity (MR-DC))) between a plurality of radio access technologies (Radio Access Technology (RATs)). MR-DC may also include a dual connection of LTE (evolved universal terrestrial radio Access (Evolved Universal Terrestrial Radio Access (E-UTRA))) with NR (E-UTRA-NR dual connection (E-UTRA-NR Dual Connectivity (EN-DC))), NR with LTE (NR-E-UTRA dual connection (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Slave Node (SN). In NE-DC, the base station (gNB) of NR is MN and the base station (eNB) of LTE (E-UTRA) is SN.

The wireless communication system 1 may also support dual connections between multiple base stations within the same RAT (e.g., dual connection (NR-NR dual connection (NR-NR Dual Connectivity (NN-DC))) of a base station (gNB) where both MN and SN are NRs).

The radio communication system 1 may include a base station 11 forming a macro cell C1 having a relatively wide coverage area, and base stations 12 (12 a to 12C) arranged in the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, etc. of each cell and user terminal 20 are not limited to those shown in the figure. Hereinafter, the base stations 11 and 12 are collectively referred to as a base station 10 without distinction.

The user terminal 20 may also 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 (Carrier Aggregation (CA)) using a plurality of component carriers (Component Carrier (CC)) and Dual Connection (DC).

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

The user terminal 20 may perform communication using at least one of time division duplex (Time Division Duplex (TDD)) and frequency division duplex (Frequency Division Duplex (FDD)) in each CC.

The plurality of base stations 10 may also be connected by wire (e.g., optical fiber based on a common public radio interface (Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11 corresponding to a higher-level station may be referred to as an integrated access backhaul (Integrated Access Backhaul (IAB)) donor (donor), and the base station 12 corresponding to a relay station (relay) may be referred to as an IAB node.

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 include at least one of an evolved packet Core (Evolved Packet Core (EPC)), a 5G Core Network (5 GCN), a next generation Core (Next Generation Core (NGC)), and the like, for example.

The user terminal 20 may be a terminal supporting at least one of communication schemes such as LTE, LTE-a, and 5G.

In the wireless communication system 1, a wireless access scheme based on orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) may be used. For example, cyclic prefix OFDM (Cyclic Prefix OFDM (CP-OFDM)), discrete fourier transform spread OFDM (Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access (OFDMA)), single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access (SC-FDMA)), and the like may be used in at least one of Downlink (DL)) and Uplink (UL).

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

As the downlink channel, a downlink shared channel (physical downlink shared channel (Physical Downlink Shared Channel (PDSCH))), a broadcast channel (physical broadcast channel (Physical Broadcast Channel (PBCH)))), a downlink control channel (physical downlink control channel (Physical Downlink Control Channel (PDCCH))), and the like shared by the user terminals 20 may be used in the wireless communication system 1.

As the uplink channel, an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH))), an uplink control channel (physical uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (physical random access channel (Physical Random Access Channel (PRACH))), or the like shared by the user terminals 20 may be used in the wireless communication system 1.

User data, higher layer control information, system information blocks (System Information Block (SIBs)), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted through the PUSCH. In addition, a master information block (Master Information Block (MIB)) may also be transmitted through the PBCH.

Lower layer control information may also be transmitted through the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI))) including scheduling information of at least one of PDSCH and PUSCH.

The DCI scheduling PDSCH may be referred to as DL allocation, DL DCI, or the like, and the DCI scheduling PUSCH may be referred to as UL grant, UL DCI, or the like. The PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

In the detection of PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may also be utilized. CORESET corresponds to searching for the resources of DCI. The search space corresponds to a search region of PDCCH candidates (PDCCH candidates) and a search method. A CORESET may also be associated with one or more search spaces. The UE may also monitor CORESET associated with a search space based on the search space settings.

One search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels (aggregation Level). One or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may also be replaced with each other.

Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), transmission acknowledgement information (e.g., also referred to as hybrid automatic repeat request acknowledgement (Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, etc.), and scheduling request (Scheduling Request (SR)) may also be transmitted through the PUCCH. The random access preamble used to establish a connection with a cell may also be transmitted via the PRACH.

In addition, in the present disclosure, downlink, uplink, etc. may be expressed without "link". The present invention may be expressed without "Physical" at the beginning of each channel.

In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted. As DL-RS, 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)), and the like may be transmitted in the wireless communication system 1.

The synchronization signal may be at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)), for example. The signal blocks including SS (PSS, SSs) and PBCH (and DMRS for PBCH) may also be referred to as SS/PBCH blocks, SS blocks (SSB)), or the like. In addition, SS, SSB, etc. may also be referred to as reference signals.

In the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a reference signal for measurement (sounding reference signal (Sounding Reference Signal (SRS))), a reference signal for Demodulation (DMRS), and the like may be transmitted. In addition, the DMRS may also be referred to as a user terminal specific reference signal (UE-specific Reference Signal).

(base station)

Fig. 25 is a diagram showing an example of a configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmitting/receiving unit 120, a transmitting/receiving antenna 130, and a transmission path interface (transmission line interface (transmission line interface)) 140. The control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140 may be provided with one or more components.

In this example, the functional blocks of the characteristic part in the present embodiment are mainly shown, and it is also conceivable that the base station 10 has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs control of the entire base station 10. The control unit 110 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field of the present disclosure.

The control unit 110 may also control generation of signals, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission/reception, measurement, and the like using the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission path interface 140. The control unit 110 may generate data, control information, a sequence (sequence), and the like transmitted as signals, and forward the generated data to the transmitting/receiving unit 120. The control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.

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

The transmitting/receiving unit 120 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmission unit may be composed of the transmission processing unit 1211 and the RF unit 122. The receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

The transmitting/receiving antenna 130 may be constituted by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.

The transmitting/receiving unit 120 may transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like. The transmitting/receiving unit 120 may receive the uplink channel, the uplink reference signal, and the like.

The transmitting-receiving unit 120 may also form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

The transmission/reception section 120 (transmission processing section 1211) may perform processing of a packet data convergence protocol (Packet Data Convergence Protocol (PDCP)) layer, processing of a radio link control (Radio Link Control (RLC)) layer (for example, RLC retransmission control), processing of a medium access control (Medium Access Control (MAC)) layer (for example, HARQ retransmission control), and the like with respect to data, control information, and the like acquired from the control section 110, for example, to generate a bit sequence to be transmitted.

The transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (error correction coding may be included), modulation, mapping, filter processing (filtering processing), discrete fourier transform (Discrete Fourier Transform (DFT)) processing (if necessary), inverse fast fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, and digital-analog conversion on a bit string to be transmitted, and output a baseband signal.

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

On the other hand, the transmitting/receiving unit 120 (RF unit 122) may amplify, filter-process, demodulate a signal in a radio frequency band received through the transmitting/receiving antenna 130, and the like.

The transmitting/receiving section 120 (reception processing section 1212) may apply an analog-to-digital conversion, a fast fourier transform (Fast Fourier Transform (FFT)) process, an inverse discrete fourier transform (Inverse Discrete Fourier Transform (IDFT)) process (if necessary), a filter process, demapping, demodulation, decoding (error correction decoding may be included), a MAC layer process, an RLC layer process, a PDCP layer process, and other reception processes to the acquired baseband signal, and acquire user data.

The transmitting-receiving unit 120 (measuring unit 123) may also perform measurements related to the received signals. For example, measurement section 123 may perform radio resource management (Radio Resource Management (RRM)) measurement, channel state information (Channel State Information (CSI)) measurement, and the like based on the received signal. Measurement section 123 may also measure received power (for example, reference signal received power (Reference Signal Received Power (RSRP))), received quality (for example, 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 (for example, received signal strength indicator (Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), and the like. The measurement results may also be output to the control unit 110.

The transmission path interface 140 may transmit and receive signals (backhaul signaling) to and from devices, other base stations 10, and the like included in the core network 30, or may acquire and transmit user data (user plane data), control plane data, and the like for the user terminal 20.

In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.

In addition, transmitting/receiving section 120 may transmit setting information (for example, CSI report setting) for causing user terminal 20 to report the phase information of the measured reference signal.

The transmitting and receiving unit 120 may also receive the channel state information (Channel State Information (CSI)) report from the user terminal 20.

Furthermore, transmitting/receiving section 120 may transmit setting information (for example, CSI report setting) for control based on transmission of radio link quality corresponding to one or more reference signals, which is reported for channel state information (Channel State Information (CSI)), to user terminal 20.

The transmitting/receiving unit 120 may transmit, to the user terminal 20, setting information (for example, CSI report setting) for controlling which reference signal corresponds to information on the radio link quality is included in a channel state information (Channel State Information (CSI)) report based on the radio link quality corresponding to the one or more reference signals.

The transmitting/receiving unit 120 may transmit setting information (for example, CSI report setting) for controlling information related to the predicted radio link quality at a future time calculated based on the radio link quality corresponding to one or more reference signals in a channel state information (Channel State Information (CSI)) report to the user terminal 20.

The transmitting and receiving unit 120 may also receive the CSI report from the user terminal 20.

(user terminal)

Fig. 26 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. The control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided with one or more types.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it is also conceivable that the user terminal 20 further has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs control of the entire user terminal 20. The control unit 210 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field of the present disclosure.

The control unit 210 may also control the generation of signals, mapping, etc. The control unit 210 may control transmission/reception, measurement, and the like using the transmission/reception unit 220 and the transmission/reception antenna 230. The control unit 210 may generate data, control information, a sequence, and the like transmitted as signals, and forward the generated data to the transmitting/receiving unit 220.

The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting/receiving unit 220 may be configured of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmitting/receiving unit 220 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmission means may be constituted by the transmission processing means 2211 and the RF means 222. The receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmitting/receiving antenna 230 may be constituted by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.

The transceiver unit 220 may also receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transceiver unit 220 may transmit the uplink channel, the uplink reference signal, and the like.

The transmitting-receiving unit 220 may also form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

The transmission/reception section 220 (transmission processing section 2211) may perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) and the like with respect to the data, control information and the like acquired from the control section 210, and generate a bit sequence to be transmitted.

The transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (error correction coding may be included), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion, and the like for a bit string to be transmitted, and output a baseband signal.

Further, whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing for transmitting the channel using a DFT-s-OFDM waveform, and if not, the transmission/reception section 220 (transmission processing section 2211) may not perform DFT processing as the transmission processing.

The transmitting/receiving unit 220 (RF unit 222) may perform modulation, filter processing, amplification, etc. for the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmitting/receiving antenna 230.

On the other hand, the transmitting/receiving unit 220 (RF unit 222) may amplify, filter-process, demodulate a baseband signal, and the like, with respect to a signal in a radio frequency band received through the transmitting/receiving antenna 230.

The transmitting/receiving section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (error correction decoding may be included), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

The transceiver unit 220 (measurement unit 223) may also perform measurements related to the received signals. For example, the measurement unit 223 may also perform RRM measurement, CSI measurement, and the like based on the received signal. The measurement unit 223 may also measure for 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.

In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220, the transmitting/receiving antenna 230, and the transmission path interface 240.

The control unit 210 may also control the inclusion of the measured phase information of the reference signal in the channel state information (Channel State Information (CSI)) report. Transmit receive unit 220 may also transmit the CSI report.

Control section 210 may control CSI report including information of the measurement time of the reference signal.

Control section 210 may also control the inclusion of spatial information of the reference signal in the CSI report.

Control section 210 may control the CSI report to include the location information of user terminal 20 (own terminal).

The transmitting/receiving unit 220 may calculate the radio link quality corresponding to one or more reference signals. The control unit 210 may also control the transmission of channel state information (Channel State Information (CSI)) reports based on the radio link quality.

Control unit 210 may also control the transmission of the CSI report based on a difference between the calculated radio link quality and the previously reported radio link quality.

Control section 210 may perform transmission of the CSI report when the index of the reference signal for achieving the maximum radio link quality of a specific number (X) is changed from that of the previous CSI report.

Control unit 210 may also control the transmission of the CSI report using a medium access control (Medium Access Control (MAC)) control element.

Further, the control unit 210 may control, based on the radio link quality, which of the reference signals corresponds to information related to the radio link quality included in a channel state information (Channel State Information (CSI)) report.

Control section 210 may control to include the information corresponding to the reference signal for achieving the maximum radio link quality in the CSI report.

Control section 210 may control to include in the CSI report the information corresponding to the reference signal that realizes the radio link quality having the greatest difference from the previously reported radio link quality.

Control section 210 may control the CSI report to include the information corresponding to the reference signal with the oldest report of the latest radio link quality.

The control unit 210 may control the channel state information (Channel State Information (CSI)) report to include information on the predicted radio link quality at a future time calculated based on the radio link quality.

Control unit 210 may also perform control to include information related to one or more of the future times in the CSI report.

Control section 210 may also control to include information on the radio link quality in the CSI report.

Control section 210 may control to include information on the prediction accuracy of the predicted radio link quality in the CSI report.

(hardware construction)

The block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. The implementation method of each functional block is not particularly limited. That is, each functional block may be realized by one device physically or logically combined, or two or more devices physically or logically separated may be directly or indirectly connected (for example, by a wire, a wireless, or the like) and realized by these plural devices. The functional blocks may also be implemented by combining the above-described device or devices with software.

Here, the functions include, but are not limited to, judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communication), forwarding (forwarding), configuration (configuration), reconfiguration (reconfiguration), allocation (mapping), assignment (allocation), and the like. For example, a functional block (structural unit) that realizes the transmission function may also be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. As described above, the implementation method is not particularly limited.

For example, a base station, a user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 27 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the present disclosure, terms of devices, circuits, apparatuses, parts (sections), units, and the like can be replaced with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to not include a part of the devices.

For example, the processor 1001 is shown as only one, but there may be multiple processors. Further, the processing may be performed by one processor, or the processing may be performed by two or more processors simultaneously, sequentially, or by other means. The processor 1001 may be realized by one or more chips.

Each function in the base station 10 and the user terminal 20 is realized by, for example, reading specific software (program) into hardware such as the processor 1001 and the memory 1002, performing an operation by the processor 1001, controlling communication via the communication device 1004, or controlling at least one of reading and writing of data in the memory 1002 and the memory 1003.

The processor 1001, for example, causes an operating system to operate to control the entire computer. The processor 1001 may be configured by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110 (210), the transmitting/receiving unit 120 (220), and the like described above may be implemented by the processor 1001.

Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment can be used. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same may be implemented for other functional blocks.

The Memory 1002 may be a computer-readable recording medium, and may be constituted by at least one of a Read Only Memory (ROM), an erasable programmable Read Only Memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable Read Only Memory (Electrically EPROM (EEPROM)), a random access Memory (Random Access Memory (RAM)), and other suitable storage media, for example. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage), or the like. The memory 1002 can store programs (program codes), software modules, and the like executable to implement a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 may also be a computer-readable recording medium, for example, constituted by at least one of a flexible disk (flexible Disc), a soft (registered trademark) disk, an magneto-optical disk (for example, a Compact Disc read only memory (CD-ROM), etc.), a digital versatile Disc, a Blu-ray (registered trademark) disk, a removable magnetic disk (removables), a hard disk drive, a smart card, a flash memory device (for example, a card, a stick, a key drive), a magnetic stripe (strip), a database, a server, and other suitable storage medium. The storage 1003 may also be referred to as secondary storage.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like, for example. In order to realize at least one of frequency division duplexing (Frequency Division Duplex (FDD)) and time division duplexing (Time Division Duplex (TDD)), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. For example, the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be implemented by the communication device 1004. The transmitting/receiving unit 120 (220) may be implemented by physically or logically separating the transmitting unit 120a (220 a) and the receiving unit 120b (220 b).

The input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, a light emitting diode (Light Emitting Diode (LED)) lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

The processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be formed using a single bus or may be formed using different buses between devices.

The base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an application specific integrated circuit (Application Specific Integrated Circuit (ASIC)), a programmable logic device (Programmable Logic Device (PLD)), and a field programmable gate array (Field Programmable Gate Array (FPGA)), or may be configured to implement a part or all of the functional blocks by using the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

(modification)

In addition, with respect to terms described in the present disclosure and terms required for understanding the present disclosure, terms having the same or similar meanings may be substituted. For example, channels, symbols, and signals (signals or signaling) may also be interchanged. In addition, the signal may also be a message. The Reference Signal (RS) can also be simply referred to as RS, and may also be referred to as Pilot (Pilot), pilot Signal, or the like, depending on the standard applied. In addition, the component carrier (Component Carrier (CC)) may also be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may also consist of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be formed of one or more slots in the time domain. The subframes may also be a fixed length of time (e.g., 1 ms) independent of the parameter set (numerology).

Here, the parameter set may also be a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), a number of symbols per TTI, a radio frame structure, a specific filter process performed by a transceiver in a frequency domain, a specific windowing (windowing) process performed by a transceiver in a time domain, and the like.

A slot may also be formed in the time domain from one or more symbols, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access (SC-FDMA)) symbols, and so on. Furthermore, the time slots may also be time units based on parameter sets.

The time slot may also contain a plurality of mini-slots. Each mini-slot may also be formed of one or more symbols in the time domain. In addition, the mini-slot may also be referred to as a sub-slot. Mini-slots may also be made up of a fewer number of symbols than slots. PDSCH (or PUSCH) transmitted in a larger time unit than the mini-slot may also be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol each represent a unit of time when a signal is transmitted. The radio frames, subframes, slots, mini-slots, and symbols may also use other designations that each corresponds to. In addition, the frame, subframe, slot, mini-slot, symbol, and the like units in the present disclosure may also be replaced with each other.

For example, one subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and one slot or one mini-slot may also be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the conventional LTE, may be a period (for example, 1 to 13 symbols) shorter than 1ms, or may be a period longer than 1 ms. The unit indicating the TTI may be referred to as a slot, a mini-slot, or the like, instead of a subframe.

Here, TTI refers to, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, a base station performs scheduling for each user terminal to allocate radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a data packet (transport block), a code block, a codeword, or the like subjected to channel coding, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, a time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

In addition, in the case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may also be the minimum time unit of scheduling. In addition, the number of slots (mini-slots) constituting the minimum time unit of the schedule can also be controlled.

A TTI having a time length of 1ms 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 slot, etc. A TTI that is shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length less than the long TTI and a TTI length of 1ms or more.

A Resource Block (RB) is a Resource allocation unit of a time domain and a frequency domain, and may include one or a plurality of consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may also be decided based on the parameter set.

Further, the RB may also contain one or more symbols in the time domain, and may be one slot, one mini-slot, one subframe, or one TTI in length. One TTI, one subframe, etc. may also be respectively composed of one or more resource blocks.

In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (SCGs), resource element groups (Resource Element Group (REGs)), PRB pairs, RB peering.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, one RE may be a subcarrier and a radio resource area of one symbol.

A Bandwidth Part (BWP) (which may also be referred to as a partial Bandwidth or the like) may also represent a subset of consecutive common RBs (common resource blocks (common resource blocks)) for a certain parameter set in a certain carrier. Here, the common RB may also be determined by an index of the RB with reference to the common reference point of the carrier. PRBs may be defined in a BWP and numbered in the BWP.

The BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). For a UE, one or more BWP may also be set in one carrier.

At least one of the set BWP may be active, and the UE may not contemplate transmission and reception of a specific signal/channel other than the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced with "BWP".

The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously changed.

The information, parameters, and the like described in the present disclosure may be expressed in absolute values, relative values to a specific value, or other corresponding information. For example, radio resources may also be indicated by a particular index.

In the present disclosure, the names used for parameters and the like are not restrictive names in all aspects. Further, the mathematical expression or the like using these parameters may also be different from that explicitly disclosed in the present disclosure. The 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 limiting names in all respects.

Information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips (chips), and the like may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

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

The input/output information, signals, and the like may be stored in a specific location (for example, a memory), or may be managed by a management table. The input and output information, signals, etc. may be overwritten, updated, or added. The outputted information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The notification of information is not limited to the embodiment described in the present disclosure, but may be performed by other methods. For example, notification of information in the present disclosure may also be implemented by physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI)))), higher layer signaling (e.g., radio resource control (Radio Resource Control (RRC)) signaling, broadcast information (master information block (Master Information Block (MIB)), system information block (System Information Block (SIB)) or the like), medium access control (Medium Access Control (MAC)) signaling), other signals, or a combination thereof.

The physical Layer signaling may be referred to as Layer 1/Layer 2 (L1/L2)) control information (L1/L2 control signal), L1 control information (L1 control signal), or the like. The RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration)) message, or the like. The MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).

Note that the notification of specific information (for example, notification of "X") is not limited to explicit notification, and may be performed implicitly (for example, by notification of no specific information or notification of other information).

The determination may be performed by a value (0 or 1) represented by one bit, a true or false value (boolean) represented by true or false, or a comparison of values (e.g., with a specific value).

Software, whether referred to as software (firmware), middleware (middleware-software), microcode (micro-code), hardware description language, or by other names, should be construed broadly to mean instructions, instruction sets, codes (codes), code segments (code fragments), program codes (program codes), programs (programs), subroutines (sub-programs), software modules (software modules), applications (applications), software applications (software application), software packages (software packages), routines (routines), subroutines (sub-routines), objects (objects), executable files, threads of execution, procedures, functions, and the like.

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

The terms "system" and "network" as used in this disclosure can be used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.

In the present disclosure, terms such as "precoding", "precoder", "weight", "Quasi Co-Location", "transmission setting instruction state (Transmission Configuration Indication state (TCI state))", "spatial relationship", "spatial domain filter (spatial domain filter)", "transmission power", "phase rotation", "antenna port group", "layer number", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS))", "radio Base Station", "fixed Station", "NodeB", "eNB (eNodeB)", "gNB (gndeb)", "access Point", "Transmission Point (Transmission Point (TP))", "Reception Point (RP))", "Transmission Reception Point (Transmission/Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", and the like can be used interchangeably. There are also cases where the base station is referred to by terms of a macrocell, a small cell, a femtocell, a picocell, and the like.

The base station can accommodate one or more (e.g., three) cells. In the case of a base station accommodating a plurality of cells, the coverage area of the base station can be divided into a plurality of smaller areas, each of which can also provide communication services through a base station subsystem, such as a small base station for indoor use (remote radio head (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of at least one of the base station and the base station subsystem that is in communication service within that coverage area.

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

There are also situations where a mobile station is referred to by a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand-held communicator (hand set), user agent, mobile client, or a number of other suitable terms.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the like. The mobile body may be a vehicle (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., an unmanned aerial vehicle (clone), an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may be an internet of things (Internet of Things (IoT)) device such as a sensor.

In addition, the base station in the present disclosure may be replaced with a user terminal. For example, the various aspects/embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, may also be referred to as Device-to-Device (D2D)), vehicle-to-evaluation (V2X), or the like. In this case, the user terminal 20 may have the functions of the base station 10 described above. In addition, terms such as "uplink", "downlink", and the like may be replaced with terms corresponding to communication between terminals (e.g., "side"). For example, the uplink channel, the downlink channel, etc. may be replaced with a side channel.

Likewise, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

In the present disclosure, the operation performed by the base station may be performed by an upper node (upper node) according to circumstances. Obviously, in a network comprising one or more network nodes (network nodes) with base stations, various operations performed for communication with a terminal may be performed by a base station, one or more network nodes other than a base station (e.g. considering a mobility management entity (Mobility Management Entity (MME)), a Serving-Gateway (S-GW)), etc., but not limited thereto, or a combination thereof.

The embodiments described in the present disclosure may be used alone, in combination, or switched depending on the execution. The processing procedures, sequences, flowcharts, and the like of the embodiments and embodiments described in this disclosure may be changed in order as long as they are not contradictory. For example, for the methods described in this disclosure, elements of the various steps are presented using the illustrated order, but are not limited to the particular order presented.

The various modes/embodiments described in the present disclosure can also be applied to long term evolution (Long Term Evolution (LTE)), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), upper 3G, IMT-Advanced, fourth-generation mobile communication system (4 th generation mobile communication system (4G)), fifth-generation mobile communication system (5 th generation mobile communication system (5G)), sixth-generation mobile communication system (6 th generation mobile communication system (6G)), x-th-generation mobile communication system (xth generation mobile communication system (xG)) (xG (x is, for example, an integer, a decimal)), future Radio access (Future Radio Access (FRA)), new Radio access technology (New-Radio Access Technology (RAT)), new Radio (NR), new Radio access (NX)), new-generation Radio access (Future generation Radio access (FX)), global system for mobile communication (Global System for Mobile communications (GSM (registered trademark)), 2000, ultra mobile broadband (Ultra Mobile Broadband (UMB)), IEEE 802.11 (IEEE-Fi (registered trademark) 802.16 (Wi), bluetooth (registered trademark) and the like), and further, a method of obtaining them based on suitable Radio communication (Bluetooth (20) and the like), multiple systems may also be applied in combination (e.g., LTE or LTE-a, in combination with 5G, etc.).

The term "based on" as used in the present disclosure is not intended to mean "based only on" unless specifically written otherwise. In other words, the recitation of "based on" means "based only on" and "based at least on" both.

Any reference to elements using references to "first," "second," etc. in this disclosure does not fully define the amount or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not mean that only two elements may be employed, or that the first element must be in some form prior to the second element.

The term "determining" used in the present disclosure may include various actions. For example, the "judgment (decision)" may be a case where judgment (decision), calculation (calculation), processing (processing), derivation (development), investigation (investigation), search (lookup), search, inquiry (search in a table, database, or other data structure), confirmation (evaluation), or the like is regarded as "judgment (decision)".

The "determination (decision)" may be a case where reception (e.g., reception of information), transmission (e.g., transmission of information), input (input), output (output), access (processing) (e.g., access to data in a memory), or the like is regarded as "determination (decision)".

The "judgment (decision)" may be a case where resolution (resolution), selection (selection), selection (setting), establishment (establishment), comparison (comparison), or the like is regarded as "judgment (decision)". That is, the "judgment (decision)" may be a case where some actions are regarded as "judgment (decision)" to be performed.

Further, "judgment (decision)" may be replaced with "assumption", "expectation", "consider", or the like.

The "maximum transmission power" described in the present disclosure may mean a maximum value of transmission power, a nominal maximum transmission power (nominal UE maximum transmission power (the nominal UE maximum transmit power)), or a nominal maximum transmission power (nominal UE maximum transmission power (the rated UE maximum transmit power)).

The terms "connected", "coupled", or all variations thereof as used in this disclosure mean all connections or couplings, either direct or indirect, between two or more elements thereof, and can include the case where one or more intervening elements are present between two elements that are "connected" or "coupled" to each other. The bonding or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access".

In the present disclosure, where two elements are connected, it is contemplated that more than one wire, cable, printed electrical connection, etc. can be used, and electromagnetic energy, etc. having wavelengths in the wireless frequency domain, the microwave region, the optical (both visible and invisible) region, etc. can be used as several non-limiting and non-inclusive examples, to be "connected" or "joined" to each other.

In the present disclosure, the term "a is different from B" may also mean that "a is different from B". In addition, the term may also mean that "A and B are each different from C". Terms such as "separate," coupled, "and the like may also be construed in the same manner as" different.

In the case where "including", "containing", and variations thereof are used in the present disclosure, these terms are meant to be inclusive in the same sense as the term "comprising". Further, the term "or" as used in this disclosure does not mean exclusive or.

In the present disclosure, for example, in the case where an article is appended by translation as in a, an, and the in english, the present disclosure may also include the case where a noun following the article is in plural form.

While the invention according to the present disclosure has been described in detail, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as a modification and variation without departing from the spirit and scope of the invention defined based on the description of the claims. Accordingly, the description of the present disclosure is for illustrative purposes and is not intended to limit the invention in any way.

Claims (6)

1. A terminal, comprising:

a receiving unit that calculates a radio link quality corresponding to one or more reference signals; and

the control means controls the CSI report, which is the channel state information report, to include information on the predicted radio link quality at a future time calculated based on the radio link quality.

2. The terminal of claim 1, wherein,

the control unit performs control including information related to one or more of the future times in the CSI report.

3. The terminal according to claim 1 or claim 2, wherein,

the control unit performs control in which information related to the radio link quality is included in the CSI report.

4. The terminal according to any one of claim 1 to claim 3, wherein,

the control unit performs control in which information related to the prediction accuracy of the predicted radio link quality is included in the CSI report.

5. A wireless communication method for a terminal includes:

a step of calculating radio link quality corresponding to one or more reference signals; and

a step of controlling the CSI report, which is a channel state information report, to include information on a predicted radio link quality at a future time calculated based on the radio link quality.

6. A base station, comprising:

a transmission unit configured to transmit setting information for causing the terminal to control a CSI report, which is a channel state information report, to include information on a predicted radio link quality at a future time calculated based on radio link quality corresponding to one or more reference signals; and

and a receiving unit for receiving the CSI report from the terminal.