Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure is characterized by having: a reception unit that, when L1L2-triggered mobility (LTM) is applied, receives setting information for Channel State Information (CSI) report that is triggered by the terminal or an event; and a control unit that implements at least one CSI report of a serving beam and a candidate beam on the basis of the setting information. According to the one aspect of the present disclosure, it is possible to appropriately perform reporting of a serving beam / candidate beam.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered.

[0004] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

[0005] In future wireless communication systems (e.g., NR), beam reporting triggered by a terminal (user terminal, User Equipment (UE)) or an event is being considered from the perspective of reducing overhead / delay.

[0006] However, when Multi-Input Multi-Output (MIMO) or L1L2-triggered mobility (LTM) is applied, it is unclear what settings are made for UE- or event-triggered beam reporting or how serving beam / candidate beam reporting is performed. If these are not clarified, it may lead to suppression of improvement in communication quality / throughput.

[0007] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately report serving beams / candidate beams.

[0008] A terminal according to one aspect of the present disclosure is characterized in that it has a receiving unit that receives configuration information for Channel State Information (CSI) reporting triggered by a terminal or an event when L1L2-triggered mobility (LTM) is applied, and a control unit that performs CSI reporting of at least one of a serving beam and a candidate beam based on the configuration information.

[0009] According to one aspect of the present disclosure, reporting of serving beams / candidate beams can be performed appropriately.

[0010] Figure 1A shows an example of UE mobility in Rel. 17. Figure 1B shows an example of UE mobility in Rel. 18. Figure 2 shows an example of a comparison between L3 handover and Rel. 18 LTM. Figure 3 shows an example of a MAC CE for Type 1. Figure 4 shows an example of a MAC CE for Type 2 (Type 2-1 / 2-2). Figure 5 shows an example of a MAC CE for beam reporting. Figures 6A and 6B show the difference between the current beam and a measurement value. Figure 7 shows an example where the configured CMR for a candidate cell / beam is different from that of the serving beam. Figure 8 shows an example where at least one of the configured CMRs for candidate cells / beams is the same as that of the serving beam. Figure 9 shows an example of a beam report based on UCI. Figure 10 shows an example of a beam report based on MAC CE. Figure 11A shows an example where all candidate beams correspond to the same frequency. FIG. 11B is a diagram illustrating an example of a case where some of multiple candidate beams are at different frequencies. FIG. 12A is a diagram illustrating a first example of Option 1 of the third embodiment. FIG. 12B is a diagram illustrating a second example of Option 1 of the third embodiment. FIG. 13A is a diagram illustrating a first example of Option 2 of the third embodiment. FIG. 13B is a diagram illustrating a second example of Option 2 of the third embodiment. FIG. 14 is a diagram illustrating an example of updating a serving beam for Options A-1 and B-1 of the third embodiment. FIG. 15 is a diagram illustrating an example of updating a serving beam for Options A-2 and B-2 of the third embodiment. FIG. 16 is a diagram illustrating an example of setting a serving beam for Aspect 3.3. FIG. 17 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 18 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 19 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. FIG. 20 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. FIG. 21 is a diagram illustrating an example of a vehicle according to an embodiment.

[0011] (CSI Reporting) In NR, a UE measures the channel state using a predetermined reference signal (or a resource for the reference signal) and feeds back (reports) channel state information (CSI) to the base station.

[0012] The UE may measure the channel state using a Channel State Information-Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a Demodulation Reference Signal (DMRS), etc.

[0013] The CSI-RS resource may include at least one of a non-zero power (NZP) CSI-RS and a CSI-Interference Management (IM). An SS / PBCH block is a block including a synchronization signal (e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)) and a PBCH (and corresponding DMRS), and may be referred to as an SS block (SSB). An SSB index may be assigned to the time position of the SSB within a half-frame.

[0014] The CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a 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 (RSRP), a L1-Reference Signal Received Quality (RSRQ), a L1-Signal to Interference plus Noise Ratio (SINR), a L1-Signal to Noise Ratio (SNR), and the like.

[0015] The CSI may have multiple parts. A first part of the CSI (CSI Part 1) may include information with a relatively small number of bits (e.g., RI). A second part of the CSI (CSI Part 2) may include information with a relatively large number of bits (e.g., CQI), such as information determined based on CSI Part 1.

[0016] As CSI feedback methods, (1) periodic CSI (P-CSI) reporting, (2) aperiodic CSI (A(AP)-CSI) reporting, and (3) semi-persistent (semi-persistent, semi-persistent) CSI reporting (Semi-Persistent CSI: SP-CSI) reporting are being considered.

[0017] The UE may be notified of information related to CSI reporting (which may be referred to as CSI reporting configuration information) using higher layer signaling, physical layer signaling (e.g., Downlink Control Information (DCI)), or a combination thereof. The CSI reporting configuration information may be configured, for example, using the RRC information element "CSI-ReportConfig."

[0018] The CSI reporting configuration information may include, for example, information regarding a reporting period, an offset, etc., which may be expressed in a predetermined time unit (slot unit, subframe unit, symbol unit, etc.). The CSI reporting configuration information may include a configuration ID (CSI-ReportConfigId). The configuration ID may identify parameters such as the type of CSI reporting method (whether it is SP-CSI, etc.), the reporting period, etc. The CSI reporting configuration information may include information (CSI-ResourceConfigId) indicating which signal (or which signal resource) is used to report the measured CSI.

[0019] (Beam Management) Up until now, in Rel-15 NR, methods of beam management (BM) have been considered. In this beam management, beam selection based on the L1-RSRP reported by the UE has been considered. Changing (switching) the beam of a certain signal / channel may be equivalent to changing the (Transmission Configuration Indication state) of the signal / channel.

[0020] The beam selected by beam selection may be a transmission beam (Tx beam) or a reception beam (Rx beam). Also, the beam selected by beam selection may be a beam of the UE or a beam of the base station.

[0021] The UE may report (transmit) measurement results for beam management using the PUCCH or PUSCH. The measurement results may be CSI including at least one of L1-RSRP, L1-RSRQ, L1-SINR, L1-SNR, etc. The measurement results may also be called beam measurements, beam measurement results, beam reports, beam measurement reports, etc.

[0022] The CSI measurement for the beam report may include interference measurement. The UE may measure channel quality, interference, etc. using resources for CSI measurement and derive a beam report. The resources for CSI measurement may be, for example, at least one of resources for SS / PBCH blocks, resources for CSI-RS, other reference signal resources, etc. Configuration information for CSI measurement reporting may be configured in the UE using higher layer signaling.

[0023] The beam report may include at least one of channel quality measurement and interference measurement results. The channel quality measurement results may include, for example, L1-RSRP. The interference measurement results may include, for example, L1-SINR, L1-SNR, L1-RSRQ, or other interference-related metrics (e.g., any metrics other than L1-RSRP).

[0024] Note that resources for CSI measurement for beam management may be referred to as beam measurement resources. Furthermore, signals / channels for which the CSI is measured may be referred to as beam measurement signals. Furthermore, CSI measurement / reporting may be interpreted as at least one of measurement / reporting for beam management, beam measurement / reporting, radio link quality measurement / reporting, etc.

[0025] CSI reporting configuration information that takes into account the current NR beam management is included in the RRC information element "CSI-ReportConfig." The information in the RRC information element "CSI-ReportConfig" will be described.

[0026] The CSI reporting configuration information (CSI-ReportConfig) may include report quantity information ("report quantity", which may be represented by the RRC parameter "reportQuantity"), which is information on parameters to be reported. The report quantity information is defined by an ASN.1 object type called "choice type". Therefore, one of the parameters (cri-RSRP, ssb-Index-RSRP, etc.) defined as the report quantity information is set.

[0027] A UE in which an upper layer parameter (e.g., the RRC parameter "groupBasedBeamReporting") included in the CSI reporting configuration information is set to enabled may include in the beam report, for each reporting configuration, multiple beam measurement resource IDs (e.g., SSBRI, CRI) and multiple corresponding measurement results (e.g., L1-RSRP).

[0028] A UE that has one or more numbers of RS resources to be reported configured by higher layer parameters (e.g., RRC parameter "nrofReportedRS") included in the CSI reporting configuration information may include one or more beam measurement resource IDs and one or more corresponding measurement results (e.g., L1-RSRP) for each reporting configuration in the beam report.

[0029] (TCI, spatial relationship, QCL) In NR, it is considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0030] The TCI state may represent that which is applied to a downlink signal / channel, and the equivalent of the TCI state that is applied to an uplink signal / channel may be expressed as a spatial relation.

[0031] The TCI state is information about the Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE for each channel or signal.

[0032] The QCL is an index indicating the statistical properties of signals / channels. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (e.g., a spatial Rx parameter) is the same between these different signals / channels (i.e., the signals / channels have a QCL with respect to at least one of these).

[0033] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may be replaced with sQCL (spatial QCL).

[0034] A plurality of types (QCL types) of QCL may be defined. For example, four QCL types A to D may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may be referred to as QCL parameters) are as follows: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay, and delay spread QCL type B (QCL-B): Doppler shift and Doppler spread QCL type C (QCL-C): Doppler shift and mean delay QCL type D (QCL-D): Spatial reception parameters.

[0035] The QCL information as shown in the above QCL types A to D may be called a QCL property.

[0036] The UE's assumption that a Control Resource Set (CORESET), channel, or reference signal has a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0037] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumption of the signal / channel.

[0038] The TCI state may be, for example, information about the QCL between the channel of interest (in other words, the Reference Signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0039] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0040] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0041] Furthermore, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0042] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be referred to as an SS / PBCH block.

[0043] An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel / signal (DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0044] (L1 / L2 Inter-Cell Mobility) It is being considered that a UE performs UL transmission to one or more cells / TRPs. The following scenario 1 or scenario 2 can be considered as a procedure in this case. In the present disclosure, the term "serving cell" may be replaced with the TRP in the serving cell. The terms "layer 1 / layer 2" (L1 / L2) and "DCI / Medium Access Control Element (MAC CE)" may be interchangeable. In the present disclosure, a physical cell identity (PCI) different from the physical cell identity (PCI) of the current serving cell may be simply referred to as a "different PCI." The terms "non-serving cell," "cell with a different PCI," and "additional cell" may be interchangeable.

[0045] <Scenario 1> Scenario 1 corresponds to, for example, multi-TRP inter-cell mobility, but may be a scenario that does not correspond to multi-TRP inter-cell mobility.

[0046] In Scenario 1, when a UE transmits or receives signals to or from an additional cell / TRP (a TRP corresponding to the PCI of the additional cell), the serving cell (the serving cell assumed by the UE) is not changed. The UE is configured with higher layer parameters related to the PCI of non-serving cells from the serving cell. Scenario 1 is applied, for example, in Rel. 17.

[0047] Figure 1A shows an example of UE movement in Rel. 17. Assume that a UE moves from a cell with PCI #1 (serving cell) to a cell with PCI #3 (additional cell) (which overlaps with the serving cell). In this case, in Rel. 17, the serving cell is not switched via L1 / L2. The additional cell is a cell with a PCI (additional PCI) different from the PCI of the serving cell. The UE can receive / transmit UE-specific (dedicated) channels from the additional cell. The UE must be within the coverage of the serving cell to receive UE common channels (e.g., system information / paging / short messages).

[0048] <Scenario 2> In scenario 2, L1 / L2 inter-cell mobility is applied. With L1 / L2 inter-cell mobility, the serving cell can be changed using functions such as beam control without RRC reconfiguration. Conventionally, handover requires RRC reconnection, which creates a period when data communication is unavailable. However, by applying L1 / L2 inter-cell mobility, data communication can be continued even when the serving cell is changed. In scenario 2, the serving cell (assumed to be the serving cell for the UE) is updated by L1 / L2 signaling. Scenario 2 may be applied in Rel. 18.

[0049] Figure 1B shows an example of UE mobility in Rel. 18. In Rel. 18, the serving cell is switched via L1 / L2. The UE can receive / transmit UE-specific channels / common channels to / from the new serving cell (target serving cell). The UE may move out of the coverage of the previous serving cell.

[0050] <Reducing interruption time> In Rel. 18 L1 / L2 inter-cell mobility (e.g., the above-mentioned scenario 2), the UE can reduce the time without data transmission (interruption time). Note that L1 / L2 inter-cell mobility may be interpreted as L1L2 triggered mobility (LTM). When Rel. 18 LTM is applied, the time without data transmission (interruption time) can be reduced compared to a method of handover based on L3 measurement results (L3 handover). Specific processes for each method are described below.

[0051] Figure 2 shows an example of a comparison between L3 handover and Rel. 18 LTM. In the case of L3 handover, the UE first performs L3 measurements and decides to perform a handover based on the measurement results. Then, the UE and the current serving cell perform RRC reconfiguration. The UE then performs DL and UL synchronization with the target serving cell. The UE performs L1 measurements / reports for the target serving cell, receives beam instructions, and then transmits the first UL data to the target serving cell. In this case, the UE does not transmit UL data during the period from the handover decision to the first UL data transmission (interruption time).

[0052] In the Rel. 18 LTM case, the UE first performs L3 measurements. Then, the UE, the current serving cell, and the target serving cell perform RRC reconfiguration. Then, the UE establishes DL synchronization with the target serving cell. Then, the UE performs L1 measurements / reports to the current serving cell and the target serving cell to establish UL synchronization. Then, the current serving cell sends a cell switch command (including beam indication) to the UE using L1L2 (DCI / MAC CE). Then, the UE transmits the first UL data to the target serving cell. In this case, the period from receiving the cell switch command to transmitting the first UL data is the UL transmission interruption time, but the interruption time is shorter than in the case of L3 handover.

[0053] (Events for L3 Measurement / Reporting) Some of the events for Radio Resource Management (RRM) reporting (L3 measurement / reporting) in Rel. 17 will be described below.

[0054] In addition, in Events A1 to A6, B1, and B2, the measurement result may be at least one measurement result of RSRP (L1-RSRP / L3-RSRP), RSRQ, and SINR (RS-SINR). In the conditions of Events A1 to A6, B1, and B2, "bad" may mean "low" and "good" may mean "high." In the conditions of Events A1 to A6, B1, and B2, SpCell means a special cell and may mean at least one of a Primary Cell (PCell) and a Primary Secondary Cell (PSCell). Each threshold may be the same or different.

[0055] <Event A1> Event A1 indicates that the serving becomes better than a threshold. Specifically, the UE considers that the entry condition for this event is met when the following condition A1-1 is met, and that the departure condition for this event is met when A1-2 is met. Condition A1-1 Ms - Hys > Threshold Condition A1-2 Ms + Hys <Thresh

[0056] In the formulas of the above conditions A1-1 and A1-2, the variables are defined as follows. - Ms is the measurement result of the serving cell, and the offset is not considered. - Hys is the hysteresis parameter of this event (i.e., the parameter (hysteresis) defined within the reporting configuration information (reportConfigNR) for this event). - Thresh is the threshold parameter of this event (i.e., the parameter (a1-Threshold) defined within the reporting configuration information (reportConfigNR) for this event). - The unit of Ms is dBm in the case of RSRP, and dB in the cases of RSRQ and RS-SINR. - Hys is expressed in dB. - The same unit as Ms is applied to Thresh.

[0057] <Event A2>Event A2 indicates that the serving (measurement result of the serving cell) becomes worse than the threshold. Specifically, the UE considers that the input condition of this event is satisfied when the condition A2-1 defined below is met, and considers that the departure condition of this event is satisfied when A2-2 is met. The meaning of the variables in each condition is the same as that of the variables in A1 above. - Condition A2-1 Ms + Hys < Thresh - Condition A2-2 Ms - Hys > Thresh

[0058] <Event A3>Event A3 indicates that, considering the offset, the neighbor (measurement result of the neighbor cell) becomes better than the SpCell. Specifically, the UE considers that the input condition of this event is satisfied when the condition A3-1 defined below is met, and considers that the departure condition of this event is satisfied when A3-2 is met.

[0059] - Condition A3-1 Mn + Ofn + Ocn - Hys > Mp + Ofp + Ocp + Off - Condition A3-2 Mn + Ofn + Ocn + Hys < Mp + Ofp + Ocp + Off

[0060] The variables in the formulas of the above conditions A3-1 and A3-2 are defined as follows: Mn is the measurement result of the neighboring cell, without taking into account the offset; Ofn is the measurement object-specific offset of the reference signal of the neighboring cell (i.e., the parameter (offsetMO) defined in the configuration information (measObjectNR) corresponding to the neighboring cell); Ocn is the cell-specific offset of the neighboring cell (i.e., the parameter (cellIndividualOffset) defined in the configuration information (measObjectNR) corresponding to the frequency of the neighboring cell), and is set to zero if not configured for the neighboring cell; Mp is the measurement result of the SpCell, without taking into account the offset; Ofp is the measurement object-specific offset of the SpCell (the parameter (offsetMO) defined in the configuration information (measObjectNR) corresponding to the SpCell); Ocp is the cell-specific offset of the SpCell (the parameter (cellIndividualOffset) defined in the configuration information (measObjectNR) corresponding to the SpCell), and is set to zero if not configured for the SpCell. - Hys is the hysteresis parameter of this event (i.e., the parameter (hysteresis) defined in the configuration information (reportConfigNR) for this event). - Off is the offset parameter of this event (i.e., the parameter (a3-Offset) defined in the configuration (reportConfigNR) for this event). - The units of Mn and Mp for RSRP are dBm, and the units of RSRQ and RS-SINR are dB. - The units of Ofn, Ocn, Ofp, Ocp, Hys, and Off are dB.

[0061] <Event A4> Event A4 indicates that the neighbor (measurement result of the neighbor cell) becomes better than a threshold. Specifically, the UE considers that the entry condition of this event is met when the following condition A4-1 is met, and that the departure condition of this event is met when A4-2 is met. The meanings of the variables in each condition are the same as those of the above-mentioned event A3.

[0062] ・Condition A4-1: Mn + Ofn + Ocn - Hys > Thresh ・Condition A4-2: Mn + Ofn + Ocn + Hys < Thresh

[0063] <Event A5> Event A5 indicates that SpCell (measurement result of SpCell) deteriorates compared to Threshold 1, and the adjacent cell (measurement result of adjacent cell) improves compared to Threshold 2. Specifically, when both of the following specified conditions A5-1 and A5-2 are satisfied, the UE considers that the input condition of this event is satisfied, and when at least one of conditions A5-3 or A5-4 is satisfied, the UE considers that the departure condition of this event is satisfied. Thresh1 and Thresh2 are the thresholds of this event respectively. The unit of Thresh1 is the same as Mp, and the unit of Thresh2 is the same as Mn. The meanings of other variables are the same as those of the variables in the above Event A3.

[0064] ・Condition A5-1: Mp + Hys < Threshl ・Condition A5-2: Mn + Ofn + Ocn - Hys > Thresh2 ・Condition A5-3: Mp - Hys > Threshl ・Condition A5-4: Mn + Ofn + Ocn + Hys < Thresh2

[0065] <Event A6> Event A6 indicates that, considering the offset, the adjacent cell (measurement result of adjacent cell) is better than SCell (measurement result of SpCell). Specifically, when the following specified condition A6-1 is satisfied, the UE considers that the input condition of this event is satisfied, and when A6-2 is satisfied, the UE considers that the departure condition of this event is satisfied.

[0066] ・Condition A6-1: Mn + Ocn - Hys > Ms + Ocs + Off ・Condition A6-2: Mn + Ocn + Hys < Ms + Ocs + Off

[0067] In this measurement, the secondary cell (SCell) corresponding to the configuration (measObjectNR) related to this event is considered as the serving cell. Furthermore, both the neighbor cell reference signal and the SCell reference signal are indicated in the related configuration (measObjectNR). The variables in the formulas of the above conditions A6-1 and A6-2 are defined as follows. The meanings of the other variables are the same as those of the variables in the above event A3. Ms is the measurement result of the serving cell, and the offset is not taken into account. Ocs is the cell-specific offset of the serving cell (i.e., cellIndividualOffset defined in the related configuration (measObjectNR)), and is set to zero if not configured in the serving cell.

[0068] <Event B1> Event B1 indicates that the inter-Radio Access Technology (RAT) neighbor cell (measurement result of the neighbor cell) becomes better than a threshold. For example, if the RAT of the serving cell is LTE (or NR / 5G), the inter-RAT neighbor cell may be an NR / 5G (or LTE) cell. Specifically, the UE considers that the entry condition of this event is met when the following condition B1-1 is met, and that the departure condition of this event is met when B1-2 is met.

[0069] ・Condition B1-1 Mn+Ofn+Ocn-Hys>Thresh ・Condition B1-2 Mn+Ofn+Ocn+Hys <Thresh

[0070] Mn is the measurement result of the inter-RAT neighbor cell without taking the offset into consideration. Ofn is the measurement target specific offset of the frequency of the inter-RAT neighbor cell (i.e., the parameter (utra-Q-OffsetRange) defined in the configuration information (measObjectEUTRA) corresponding to the frequency of the neighboring inter-RAT cell, and the parameter (utra-FDD-Q-OffsetRange) defined in the configuration information (measObjectUTRA-FDD) corresponding to the frequency of the neighboring inter-RAT cell). Ocn is the cell specific offset of the inter-RAT neighbor cell (i.e., the parameter (cellIndividualOffset) defined in the configuration information (measObjectEUTRA) corresponding to the neighboring inter-RAT cell), and is set to 0 if not configured for the neighbor cell. Hys is the hysteresis parameter of this event (i.e., the parameter (hysteresis) defined in the configuration information (reportConfigInterRAT) of this event). - Threshold indicates the threshold parameter of this event (i.e., the parameter (b1-ThresholdEUTRA) defined in the configuration information (reportConfigInterRAT) of this event or the parameter defined for UTRA-FDD (b1-ThresholdUTRA-FDD)). - The unit of Mn is dBm or dB depending on the measurement quantity of the inter-RAT neighboring cell. - The unit of Ofn, Ocn, and Hys is dB. - The same unit as Mn is used for Threshold.

[0071] <Event B2> Event B2 indicates that the PCell (measurement result of the PCell) becomes worse than threshold 1 and the inter-RAT neighboring cell (measurement result of the neighboring cell) becomes better than threshold 2. Specifically, the UE considers that the entry condition for this event is met when both conditions B2-1 and B2-2 specified below are met, and that the exit condition for this event is met when at least one of conditions B2-3 or B2-4 is met.

[0072] - Condition B2-1: Mp + Hys < Thresh1 - Condition B2-2: Mn + Ofn + Ocn - Hys > Thresh2 - Condition B2-3: Mp - Hys > Thresh1 - Condition B2-4: Mn + Ofn + Ocn + Hys < Thresh2

[0073] - Mp is the measurement result of PCell, and the offset is not considered. - Thresh1 and Thresh2 are the threshold values for this event, respectively. The unit of Thresh1 is the same as that of Mp, and the unit of Thresh2 is the same as that of Mn. The meanings of other variables are the same as those of the variables in Event B1 above.

[0074] <Event T1> Event T1 indicates that the measurement time of the UE is within a predetermined time from the threshold value. Specifically, the UE considers that the input condition of this event is satisfied when Condition T1-1 defined below is met, and considers that the departure condition of this event is satisfied when Condition T1-2 is met.

[0075] - Condition T1-1: Mt > Thresh1 - Condition T1-2: Mt > Thresh1 + Duration

[0076] The variables in the formula are defined as follows: - Mt is the time measured by the UE. - Thresh1 is the threshold parameter of this event (i.e., the parameter (t1-Threshold) defined in the configuration information (reportConfigNR) corresponding to this event). - Duration is the parameter indicating the period of this event (i.e., the parameter (duration) defined in the configuration information (reportConfigNR) corresponding to this event). - The unit of Mt is ms. - The unit of Thresh1 is the same as that of Mt. - The unit of Duration is the same as that of Mt.

[0077] <Event I1> Event I1 indicates that the interference becomes higher than the threshold value. Specifically, the UE considers that the input condition of this event is satisfied when Condition I1-1 defined below is met, and considers that the departure condition of this event is satisfied when Condition I1-2 is met.

[0078] ・Condition I1-1 Mi-Hys>Thresh ・Condition I1-2 Mi+Hys <Thresh

[0079] The variables in the equations for the above conditions I1-1 and I1-2 are defined as follows: Mi is the interference measurement result, and offset is not taken into account. Hys is the hysteresis parameter for this event (i.e., the parameter (hysteresis) defined in the configuration information (reportConfigNR) for this event). Threshold is the threshold parameter for this event (i.e., the parameter (i1-Threshold) defined in the configuration information (reportConfigNR) for this event). The units of Mi and Thresh are dBm. The unit of Hys is dB.

[0080] (Beam Report Types) <Intra-cell beam reporting in Rel. 15 / 16> In Rel. 15 / 16, intra-cell beam reporting is supported. For example, L1-RSRP / SINR reporting can be configured by higher layer signaling (RRC).

[0081] For example, in calculating the L1-RSRP, the UE may be configured with either or both of the CSI-RS resource and the SS / PBCH block resource if the resource is associated with QCL Type C / Type D.

[0082] A UE may also be configured with up to 16 CSI-RS resource sets, with a maximum of 64 resources in each set, and the total number of different CSI-RS resources across all resource sets may not exceed 128.

[0083] For L1-RSRP reporting, if the higher layer parameter nrofReportedRS (e.g., in CSI-ReportConfig) is set to 1, the reported L1-RSRP value is defined as a 7-bit value in the range [-140 to -44] dBm with a step size of 1 dB.

[0084] Here, the maximum measured value of L1-RSRP is quantized to a 7-bit value in the range of [-140 to -44] dBm in 1 dB steps, and the differential value of L1-RSRP is quantized to a 4-bit value.

[0085] The difference value is calculated with a step size of 2 dB with reference to the largest measurement that is part of the same L1-RSRP reporting instance.

[0086] For example, for L1-SINR calculation and channel measurement, the UE may be configured with either or both of NZP CSI-RS resources and SS / PBCH block resources, and for interference measurement, the UE may be configured with either NZP CSI-RS resources or CSI-IM resources.

[0087] For channel measurement, the UE may be configured with a CSI resource setting for up to 64 CSI resources or up to 16 CSI-RS resource sets with SS / PBCH block resources.

[0088] For L1-SINR reporting, if the upper layer parameter nrofReportedRS is set to 1, the reported L1-SINR value is defined as a 7-bit value in the range [-23 to 40] dBm with a step size of 0.5 dB.

[0089] If the higher layer parameter nrofReportedRS is set to be greater than 1, or if the higher layer parameter groupBasedBeamReporting is set to "enabled", the UE uses the differential value-based L1-SINR value for reporting.

[0090] The difference value is calculated with a step size of 1 dB with reference to the largest measurement that is part of the same L1-SINR reporting instance.

[0091] In this disclosure, the Rel. 15 / 16 in-cell beam reporting (which may simply be referred to as in-cell beam reporting) may also be referred to as type 1 beam reporting (beam reporting type 1) or beam reporting for in-cell beam switching.

[0092] <Inter-cell beam reporting in Rel. 17> As mentioned above, Rel. 17 supports L1 / L2 inter-cell mobility. For example, a UE can transmit and receive UL / DL channels / signals to and from a PCI of a cell that is different from the PCI of the serving cell. For example, if a non-serving cell has a higher RSRP than the serving cell, the UE can transmit and receive UL / DL channels / signals to and from the non-serving cell without performing a handover.

[0093] In L1-RSRP reporting, absolute / differential values ​​of L1-RSRP may be used, as in Rel. 15 / 16. In inter-cell beam reporting (type 2-1 beam reporting, described later) in Rel. 17, each L1-RSRP value is associated with a PCI ID (for the serving cell / additional cell / candidate cell). The association between the L1-RSRP value and the PCI ID may be set / indicated by higher layer signaling / physical layer signaling.

[0094] Configuration by higher layer signaling supports up to seven additional cells, where ID=0 means the PCI of the serving cell.

[0095] In this disclosure, inter-cell beam reporting (in Rel. 17 / 18) may be referred to as Type 2 beam reporting (Beam Report Type 2). Type 2 beam reporting can be further classified into Types 2-1 and 2-2, which will be described later.

[0096] In this disclosure, Rel. 17 beam reporting may be referred to as Type 2-1 beam reporting or beam reporting for inter-cell beam switching.

[0097] <Inter-cell beam reporting in Rel. 18> In addition, Rel. 18 supports only SSB-based L1-RSRP reporting (beam reporting). Here, the number of candidate cells L may be any value between 1 and 4, and the number of beams M per cell may be any value between 1 and 4. For example, in beam reporting, a 7-bit absolute value (the largest L1-RSRP value among all cells) is reported for one cell, and all remaining L1-RSRP values ​​are reported as differential values.

[0098] Regarding beam selection in SSB-based L1-RSRP reporting, the maximum value of M*L that can be configured by RRC for the above-mentioned M and L, and the combination of M and L may depend on the UE capabilities.

[0099] In the L1-RSRP report, the absolute value / differential value of the L1-RSRP may be used, as in Rel. 15 / 16 / 17.

[0100] In the L1-RSRP report, the reported L1-RSRP value is defined as a 7-bit value in the range of [-140 to -44] dBm with a step size of 1 dB.

[0101] Here, the maximum measured value of L1-RSRP is quantized to a 7-bit value in the range of [-140 to -44] dBm in 1 dB steps, and the differential value of L1-RSRP is quantized to a 4-bit value.

[0102] The difference value is calculated with a step size of 2 dB with reference to the largest measurement that is part of the same L1-RSRP reporting instance.

[0103] The L1-RSRP report includes the SSBRIs between the configured candidate cells. That is, the L1-RSRP report includes the SSBRIs of the configured candidate cells and the corresponding L1-RSRPs. The format may be the same as that of the existing specifications.

[0104] In this disclosure, the beam report of Rel. 18 may be referred to as a Type 2-2 beam report or a beam report for cell switching. Note that the Type 2-2 beam report does not include information about the PCI (PCI ID). Instead, the SSBRI may include information about the PCI. For example, if four cells have 64 SSBs, the SSBRI may be any of {0, 1, ..., 255}.

[0105] (Beam Report MAC CE) An example of a new beam report MAC CE will now be described.

[0106] [Option 1] MAC CE may be defined for each type of beam report (Type 1 indicating intra-cell beam report, and Type 2 indicating inter-cell beam report).

[0107] For example, Fig. 3 shows an example of a MAC CE for Type 1, and Fig. 4 shows an example of a MAC CE for Type 2 (Type 2-1 / 2-2). The MAC CE in Fig. 3 and the MAC CE in Fig. 4 may have different Logical Channel IDs (LCIDs).

[0108] As shown in FIG. 3, the MAC CE for Type 1 includes the second to fourth measurement results and a field indicating the presence of an RS ("C i " field (i = 2, 3, 4)), a field indicating the RS IDs corresponding to the top four beams ("RS ID i" field (i = 1, 2, 3, 4)), a field indicating the measurement results ("L1-RSRP i" field (i = 2, 3, 4)), and a reserved field ("R" field).

[0109] The field indicating the RS ID may consist of 6 bits in the case of SSBRI only, or 7 bits in the case of SSBRI / CRI.

[0110] In the diagram showing an example of MAC CE in the present disclosure, an example in which the measurement results are indicated by L1-RSRP is described, but this is merely an example, and the indicator of the measurement results is not limited to this.

[0111] In the MAC CE, the field corresponding to the measurement result of the best (first highest) beam may be defined by the first number of bits (e.g., 7 bits), in which case the field may indicate the absolute value of the measurement result.

[0112] In the MAC CE, a field corresponding to the measurement results of beams other than the best beam (e.g., the measurement results of the second to fourth beams) may be defined with a second number of bits (e.g., 4 bits), in which case the field may indicate a relative / differential value with respect to the measurement result of the best beam.

[0113] In the MAC CE, a field corresponding to the measurement results of beams other than the best beam (e.g., the measurement results of the second to fourth beams) may be defined by the first number of bits (e.g., 7 bits). In this case, the field may indicate the absolute value of the measurement results.

[0114] In the MAC CE, "C i The "C" field may be represented by 1 bit. i If the "C" field indicates a first value (e.g., 0), it may indicate that the corresponding beam is not reported. i If the " field indicates a second value (e.g., 1), it may indicate that reporting of the corresponding beam is performed.

[0115] For example, if the "C2", "C3", and "C4" fields each indicate 1, the measurement results and RS ID of the second beam, the measurement results and RS ID of the third beam, and the measurement results and RS ID of the fourth beam may be reported in the MAC CE. In other words, only when the "C2", "C3", and "C4" fields indicate 1, the fields (RSRP / PCI) corresponding to the second to fourth beams may be present.

[0116] In FIG. 3, the fields in octets 3 to 7 may be optional.

[0117] The MAC CE for Type 2 shown in FIG. 4 has 16 bits corresponding to octets 8 and 9 added to the MAC CE for Type 1 shown in FIG.

[0118] The additional fields may include a field indicating the PCI of the serving cell / additional cell / candidate cell ("PCI i" field (e.g., i = 1, 2, 3, 4)) and a reserved field ("R" field). The field indicating the PCI may be configured with, for example, 3 bits.

[0119] The additional fields (also utilizing the reserved fields) can indicate the PCI of up to seven additional cells in addition to the PCI of one serving cell. The size of each field can be changed as needed. The size of each field can be configured by the RRC, predefined by a specification, or determined by the UE capabilities.

[0120] For example, the size of a field indicating an RS ID (RS ID field) may be increased or decreased depending on whether a field indicating a PCI (PCI field) is included. For example, if a field indicating a PCI is not included (e.g., Type 2-1), the RS ID field may be increased / extended (e.g., 2 bits). That is, the size of the PCI field may be variable depending on the type of beam report.

[0121] [Reporting of Current Beam] Reporting of the current beam will be described. Fig. 5 is a diagram showing an example of a MAC CE for beam reporting. Fig. 6A and Fig. 6B are diagrams showing the difference between the current beam and the measurement value.

[0122] In event-based beam reporting, the UE sends a beam report only when a specific event occurs, where the reported beam is assumed to be a better beam than the current beam.

[0123] Therefore, the beam to be reported can be reported as a difference value with respect to the current beam (based on the current beam). This can reduce the amount of information (number of bits) for reporting and save the overhead of MAC CE. Here, the difference value should always be a positive value with respect to the current beam.

[0124] In the MAC CE shown in FIG. 5, the second to fourth measurement results and the field indicating the presence of RS ("C i" field (i = 2, 3, 4)), a field indicating the RS IDs corresponding to the top four beams ("RS ID i" field (i = 1, 2, 3, 4)), a field indicating the measurement results ("L1-RSRP i" field (i = 1, 2, 3, 4)), and a reserved field ("R" field).

[0125] In the MAC CE, the field corresponding to the measurement result of the beam may indicate a relative value / differential value with respect to the measurement result of the current beam. In this case, the measurement value (absolute value) of the current beam may not be included. By reporting only the differential value, the communication overhead of the MAC CE can be reduced.

[0126] Assuming that the reported beam is a better beam than the current beam, the difference values ​​of RS1 to RS4 relative to the current beam may be reported as positive values, as shown in FIG. 6A.

[0127] On the other hand, as shown in FIG. 6B, if a beam is not better than the current beam (e.g., RS4), the difference value of RS4 may or may not be reported.

[0128] For example, when reporting using MAC CE, the field size is variable, so even if the UE is configured to report four beams, it does not need to report (do not include in the report) negative differential values ​​(RS4 differential values).

[0129] On the other hand, when reporting using UCI (UCI-based beam reporting), the payload is fixed, so the UE needs to report a negative differential value (RS4 differential value).

[0130] <Variations> Whether to add the absolute value of L1-RSRP for the current beam may be set / indicated by higher layer signaling / physical layer signaling, may be predefined by a specification, or may be determined by reporting of UE capabilities. For example, when reporting UE capabilities, the UE may add a new field to the MAC CE / UCI and report it.

[0131] <Further Variations> Whether to report the absolute value for the current beam may be determined based on a predetermined threshold. For example, the UE may report only if the absolute value for the current beam is smaller / larger than X dB. In this case, X may be set / indicated by higher layer signaling / physical layer signaling, may be predefined by a specification, or may be determined by reporting UE capabilities. Note that the gNB may want to know the absolute value of the current beam when the absolute value is very low (almost a failure).

[0132] (Indicated TCI State / Configured TCI State) For Rel. 17 TCI states, unified / common TCI state may mean the Rel. 17 TCI state indicated using (Rel. 17) DCI / MAC CE / RRC (indicated Rel. 17 TCI state).

[0133] In the present disclosure, the terms indicated Rel. 17 TCI state, indicated TCI state, unified / common TCI state, TCI state applicable to multiple types of signals (channels / RS), and TCI state for multiple types of signals (channels / RS) may be interpreted interchangeably.

[0134] The indicated Rel. 17 TCI state may be shared with at least one of the UE-specific reception of PDSCH / PDCC (updated using Rel. 17 DCI / MAC CE / RRC), PUSCH of dynamic grant (DCI) / configured grant, and multiple (e.g., all) dedicated PUCCH resources. The TCI state indicated by DCI / MAC CE / RRC may be referred to as the indicated TCI state or the unified TCI state.

[0135] Regarding the Rel. 17 TCI state, a TCI state other than the unified TCI state may refer to a Rel. 17 TCI state configured using (Rel. 17) MAC CE / RRC (configured Rel. 17 TCI state). In this disclosure, the terms configured Rel. 17 TCI state, configured TCI state, TCI state other than the unified TCI state, and TCI state applied to a specific type of signal (channel / RS) may be interpreted interchangeably.

[0136] The configured Rel. 17 TCI state may not be shared with at least one of the UE-specific reception of PDSCH / PDCC (updated using Rel. 17 DCI / MAC CE / RRC), PUSCH of dynamic grant (DCI) / configured grant, and multiple (e.g., all) dedicated PUCCH resources. The configured Rel. 17 TCI state may be configured by RRC / MAC CE per CORESET / per resource / per resource set, and may not be updated even if the indicated Rel. 17 TCI state (common TCI state) is updated.

[0137] (Beam Management / Reporting Enhancements) Assuming a unified TCI and targeting FR2 and single TRP with intra-cell and inter-cell beam management, enhancements are being considered to facilitate UE-driven / event-driven beam management to reduce overhead / latency.

[0138] For example, it is preferable to consider UL signaling content / procedures for UE-initiated / event-driven beam reporting that facilitates fast beam switching, and it is preferable to consider a UL signal medium / container that is primarily designed for the purpose of beam reporting, taking into account the UE-initiated / event-driven nature of UL transmissions.

[0139] <Multi-Input Multi-Output (MIMO) UE / Event-Triggered Beam Reporting> A candidate beam or beam of a candidate cell is compared with the current serving beam (one beam). For example, if a configured event condition (e.g., quality is greater than / less than a threshold) is met, a report is triggered. The candidate cell / beam is on the same frequency as the current serving cell / beam.

[0140] If intra-cell beam management is applied, the candidate beam also corresponds to the serving cell (same PCI). If inter-cell beam management is applied, the candidate beam may correspond either to the serving cell or to a candidate cell with a different PCI (same frequency).

[0141] <Beam Reporting Triggered by UE / Event in L1L2-triggered mobility (LTM)> A candidate beam or beam of a candidate cell is compared with the current serving beam (one / multiple beams from the serving cell). For example, if a configured event condition (e.g., quality is greater / less than a threshold) is met, a report is triggered. The candidate cell / beam may be on a different frequency than the current serving cell / beam. The configured events / thresholds / other parameters may be different for the MIMO case and the LTM case. In the LTM case, the candidate beam may correspond to a candidate cell of a different PCI (same or different frequency).

[0142] (Analysis) In future wireless communication systems (e.g., NR), beam reporting triggered by UE or events is being considered from the perspective of reducing overhead / delay.

[0143] However, when MIMO or LTM is applied, it is not clear what settings are made for beam reporting triggered by a terminal or an event, or how to implement reporting of serving beams / candidate beams. If these are not clarified, it may lead to suppression of improvement of communication quality / throughput.

[0144] Therefore, the present inventors have conceived a wireless communication method that can properly report serving beams / candidate beams.

[0145] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0146] (Various Reinterpretations) In the present disclosure, a word enclosed in "( )" in a sentence may indicate an explanation of the word immediately preceding it (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Furthermore, in the present disclosure, a word enclosed in "[ ]" in a sentence may be interpreted including the word in the meaning of the entire sentence, or may be interpreted excluding (ignoring) the word in the meaning of the entire sentence. Note that "( )" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0147] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0148] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0149] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0150] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0151] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0152] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0153] In the present disclosure, the terms cell, PCI, serving cell, source serving cell, source cell, CC, BWP, BWP in CC, and band may be interchangeable. In the present disclosure, the terms cell, PCI, target configuration ID, target cell, cell with additional PCI, additional cell, other cell, non-serving cell, cell with a different PCI, candidate cell, candidate cell ID, candidate serving cell, cell with a PCI different from the PCI of the current serving cell, and another serving cell may be interchangeable. The target cell may be a cell selected from multiple candidate cells.

[0154] In the present disclosure, the terms beam, CMR, RS (e.g., CSI-RS / SSB), RS index, and RS resource / resource set may be interchangeable. The terms report, transmission, and transmission of CSI report may be interchangeable.

[0155] In the present disclosure, the terms event-based beam report, event-based beam report, event-triggered beam report, event-driven beam report, UE-triggered beam report, and UE-initiated beam report may be interchangeable. The event in the present disclosure may be at least one or a combination of the above events A1 to A6, B1, B2, T1, and I1.

[0156] In the present disclosure, the terms quality, L1-RSRP, and L1-SINR may be interchangeable. The content of a report (beam report) in the present disclosure may be, for example, L1-RSRP / L1-SINR.

[0157] The MIMO and LTM in the present disclosure may be, for example, the MIMO and LTM of Rel. 19. The beam report and the CSI report may be interchangeable. The serving cell and the serving beam may be interchangeable. The candidate cell and the candidate beam may be interchangeable.

[0158] (Wireless Communication Method) Each embodiment of the present disclosure may be based on the above-mentioned <MIMO UE / event triggered beam reporting>. For example, when Multi-Input Multi-Output (MIMO) is applied, the UE may receive configuration information for UE / event triggered beam reporting (CSI reporting) and perform beam reporting of serving beams / candidate beams based on the configuration information.

[0159] Alternatively, each embodiment of the present disclosure may be based on the premise of <UE / event-triggered beam reporting in LTM>. For example, when L1L2-triggered mobility (LTM) is applied, the UE may receive information regarding the configuration of UE / event-triggered beam reporting (CSI reporting) and perform beam reporting of serving beams / candidate beams based on the configuration information.

[0160] <First Embodiment> A UE may receive a CSI reporting configuration (CSI-ReportConfig) for UE / event-triggered beam reporting. Then, the UE may (implicitly) determine a serving beam (one beam / RS) for measurement based on the indicated TCI state (e.g., joint / DL TCI state) and perform CSI reporting of the determined serving beam. The indicated TCI state (e.g., joint / DL TCI state) may be, for example, the indicated Rel. 17 TCI state (indicated TCI state). Performing CSI reporting may mean transmitting a CSI report to the NW.

[0161] The UE may receive the CMR configuration in the CSI reporting configuration via RRC signaling. The CMR configuration may include the CMR configuration of the candidate cell / beam. The UE may compare the CMR measurement result based on the CMR configuration of the candidate cell / beam with the CMR measurement result of the serving cell / beam. The number of CMRs (e.g., X1) configured for the candidate beam is configured via RRC signaling.

[0162] Note that the serving beam implicitly determined by the UE may or may not be included in the CMR configuration (explicit configuration). Since the configured CMR is based on the implementation of the network, the serving beam may or may not be indicated in the CMR configuration based on the serving beam that is dynamically changed depending on the indicated joint / DL TCI state.

[0163] It should be noted that the first embodiment may be applied to both MIMO (for example, Rel. 19) and LTM / mobility (for example, Rel. 19).

[0164] If the configured CMR for a candidate cell / beam is different from the serving beam implicitly determined by the UE (e.g., if the QCL source RS of the indicated joint / DL TCI state is different from one of the configured CMRs) (Figure 7), the UE may compare the CMR measurement results of the candidate beam and the CMR measurement results of the serving beam.

[0165] If at least one of the configured CMRs for a candidate cell / beam is the same as the serving beam that the UE has implicitly determined (e.g., if the QCL source RS of the indicated joint / DL TCI state is the same as one of the configured CMRs) (Figure 8), the UE may ignore this configured CMR when comparing the candidate beam measurement results and the serving beam measurement results.

[0166] The UE may transmit, as UE capability information, the maximum number of CMRs configured for at least one of a candidate beam, a candidate cell having a PCI different from that of the serving cell, and a candidate cell having a frequency different from that of the serving cell. The UE may receive the configuration of the maximum number of CMRs according to the UE capability information.

[0167] After UE / event triggered beam reporting / management is performed, if the target serving beam reported by the UE is updated (applied) to a new serving beam (e.g., when the NW sends some ACK information to acknowledge the UE's beam switch request or cell switch request), the UE may apply / update the serving beam implicitly determined by the UE for the CSI reporting configuration for UE / event triggered beam reporting as the new serving beam, which facilitates subsequent UE / event triggered beam reporting.

[0168] According to the first embodiment, the UE (implicitly) determines the serving beam for measurement based on the indicated TCI state, thereby reducing the signaling overhead for serving configuration for measurement.

[0169] Second Embodiment The setting of this embodiment may include the CMR setting of the first embodiment. Note that the content of the report (beam report) in the present disclosure may be, for example, L1-RSRP / L1-SINR.

[0170] <<Reporting of Serving Beam>> The UE may receive a CSI reporting configuration (CSI-ReportConfig) for beam reporting of the serving beam (1 beam). For reporting on the UE's serving beam, at least one of the following options may be applied:

[0171] Option 1: The UE may always report the quality of the serving beam, but the UE may not report the RS index of the serving beam.

[0172] Option 2: The UE may not always report the quality of the serving beam, and the UE may not always report the RS index corresponding to the serving beam.

[0173] Option 3: The UE may receive configuration information indicating whether to report the quality of the serving beam, and may decide whether to report the quality of the serving beam based on the configuration information. The UE may not report the RS index of the serving beam.

[0174] Option 4: The UE may report (explicitly) the RS index of the serving beam, or a 1-bit field may be used to indicate the serving beam (e.g., in the case of reporting by MAC CE).

[0175] <<Candidate Cell / Beam Reporting>> The UE may receive a configuration (e.g., CSI reporting configuration) for reporting candidate cells / beams (1 beam). For the UE's reporting of candidate cells / beams, at least one of the following options may be applied:

[0176] Option A: The number of candidate beams to be reported is predefined in the specification, e.g., 1.

[0177] Option B: The UE may receive the setting of the number of candidate beams to be reported, "N," from the NW via higher layer signaling / physical layer signaling. In this case, the UE may select N candidate beams and report measurement results of the selected candidate beams to the NW.

[0178] Option C: The UE may receive the setting of the number of candidate beams to be reported, "N", from the NW via higher layer signaling / physical layer signaling. In this case, the UE may select 1 to N beams and report the measurement results of the selected candidate beams to the NW. The number of candidate beams to be actually reported is determined by the UE and may be indicated to the NW by an explicit reporting field or an implicit instruction.

[0179] Option D: The UE may receive other parameter or restriction settings from the NW via higher layer signaling / physical layer signaling, defined in a specification, or reported as UE capability information. These settings may be, for example, the maximum number of selected candidate cells, the maximum number of selected frequencies, the maximum number of selected beams per cell / frequency, etc. The UE may determine the number of candidate beams to select / report based on these settings.

[0180] The UE may select the candidate beam with the best quality, the top M candidate beams with quality, or a candidate beam with quality higher than the serving beam. The UE may report the RS index (e.g., the CMR reindexing index described below) of the selected candidate beam.

[0181] <<Report Contents of Serving Cell / Beam and Candidate Cell / Beam>> The UE may transmit a beam report (CSI report) including measurement results of the serving beam and the candidate beams. The beam report may include the measurement result of the best beam among the beams (e.g., 7 bits) and a difference value (e.g., 4 bits) from the measurement result of the best beam. At least one of the following options may be applied to the report contents (quantization method) of the serving cell / beam and the candidate cell / beam. For example, different options may be applied depending on the event.

[0182] Option a: The reported serving beam measurement results (e.g., RSRP / SINR) may be quantized with 7 bits. If the UE reports measurements of multiple candidate beams, the largest measurement result of the candidate beam may be quantized with 7 bits, and the other measurements may be differentially quantized with 4 bits.

[0183] Option b: The maximum measurement result of the candidate beam is quantized with 7 bits, and the other measurements of the candidate beam and the measurement result of the serving beam are differentially quantized with 4 bits. Note that the measurement result of the serving beam is differentially quantized with 4 bits because the candidate beam is usually superior to the serving beam when a report is triggered.

[0184] When mapping the order of serving beams and candidate beams in a reporting container based on UCI / MAC CE, if the RS index of the serving beam is not reported, the position of the measurement results of the serving beam may be fixed.

[0185] For example, in the report, the measurement results / RS ID of the serving beam may be placed before the measurement results / RS IDs of all candidate beams, may be placed immediately after the best measurement result / RS ID of the candidate beam, or may be placed after the measurement results / RS IDs of all candidate beams.

[0186] The beam report of this embodiment may use a format similar to that of the MAC CE in Fig. 3 or 4. For example, the RS ID / L1-RSRP in Fig. 3 or 4 may be the RS ID / L1-RSRP corresponding to the serving beam or the candidate beam.

[0187] <<Specific Example>> A specific example of the beam report of this embodiment will be described.

[0188] 9 is a diagram showing an example of a beam report based on UCI. This figure applies when up to four (N=4) candidate beams are configured for beam reporting and one serving beam is configured for reporting. In the example of FIG. 9, the ID of the serving beam may not be included in the report.

[0189] Figure 10 shows an example of beam reporting based on MAC CE. Figure 10 applies when up to four (N=4) candidate beams are configured for beam reporting and one serving beam is configured for reporting. T in Figure 10 may indicate whether the next octet (entry) for the candidate beam exists. Reindexing index will be described later.

[0190] In the second embodiment, different examples / options may be applied depending on the following settings, etc. Note that MIMO / LTM may be, for example, MIMO / LTM of Rel. 19. MIMO or LTM. Intra-cell or inter-cell when MIMO is applied. Intra-cell or inter-cell when LTM is applied. Applied event (e.g., the above events A2, A3, A4, A5, etc.). UCI-based reporting or MAC CE-based reporting.

[0191] <<Reindexing index>> Assume that the number of configured CMRs corresponding to candidate beams is X. If the UE finds that the determined serving beam is included in the configured CMRs, at least one of the following options may be applied for the reindexing reported for the CMRs of the candidate beams:

[0192] Option 1: The number of bits for reindexing is ceil(log2(X)) bits.

[0193] Option 2: The number of re-indexing bits is ceil(log2(X-1)). In this case, the UE does not include the same CMR as the serving beam in the re-indexing and reporting. This can reduce the bit size.

[0194] The re-index may be a newly created index by extracting a part of the CMR index (RS ID). By using the re-index, the number of bits can be reduced compared to when the CMR index (RS ID) is used.

[0195] <<Frequency of Serving Beam and Candidate Beam>> In Rel. 19 LTM, different frequencies may be applied to the serving cell / beam and the candidate cell / beam. In the following cases (1) and (2), the UE can configure (determine) different offsets / thresholds, respectively.

[0196] (1) The case where the serving beam and the candidate beam have the same frequency. (2) The case where at least one frequency of the serving beam and the candidate beam is different. Note that when the frequencies of the serving beam and the candidate beam are different, one offset value is used. Alternatively, one offset value may be set for each frequency of the candidate cell.

[0197] If certain conditions are met (for example, if L1-RSRP measurement is configured), the UE can configure (determine) different offsets / thresholds in cases (1) and (2).

[0198] For different cells / CCs (different frequencies), different transmit powers may be used, so if no different offset is applied, the UE may always select the candidate beam on the CC with the highest transmit power.

[0199] 11A is a diagram illustrating an example of a case where all candidate beams correspond to the same frequency. Figure 11A corresponds to the case (1) where the serving beam and the candidate beams have the same frequency. This frequency may be the frequency of the serving cell.

[0200] Figure 11B shows an example of a case where some candidate beams among multiple candidate beams have different frequencies. Figure 11B corresponds to case (2) where at least one frequency of the serving beam and the candidate beams is different. The serving beam and some candidate beams may correspond to a first frequency (serving cell), and other candidate beams may correspond to a second frequency (candidate cell). In Figure 11B, an offset value may be added to candidate beams #3 and #4 during an event check.

[0201] The UE may generate / transmit one beam report for one frequency (cell). For example, in the case of Fig. 11A, the UE may generate / transmit one beam report including the serving beam and the candidate beam. For example, in the case of Fig. 11B, the UE may generate / transmit a beam report for the serving cell and a beam report for the candidate cell, respectively.

[0202] According to this embodiment, the UE can properly report the serving beam / candidate beam.

[0203] Third Embodiment [Aspect 3.1] A UE may receive a CSI reporting configuration (CSI-ReportConfig) for UE / event triggered beam reporting.

[0204] The CMR configuration in the CSI reporting configuration is transmitted by RRC signaling and may include the CMR configuration of the candidate cell / beam. The UE may compare the CMR measurement result based on the CMR configuration of the candidate cell / beam with the CMR measurement result of the serving cell / beam. The number of CMRs (e.g., X1) configured for the candidate beam is configured by RRC signaling.

[0205] Option 1: In the CMR configuration, the CMRs (CMR indexes) of candidate beams and the CMRs (CMR indexes) of serving beams may be included in separate lists. The UE may, for example, transmit a beam report corresponding to the CMR for each list.

[0206] Figure 12A is a diagram showing a first example of option 1 of the third embodiment. Figure 12A shows the CMR lists of candidate beams (CMRs #1 to #8) and the CMR list of a serving beam that includes one serving beam CMR (CMR #1).

[0207] Figure 12B is a diagram showing a second example of option 1 of the third embodiment. Figure 12B shows a CMR list of candidate beams (CMRs #1 to #8) and a CMR list of a serving beam that includes multiple serving beam CMRs (CMRs #1 and #2).

[0208] Option 2: In the CMR configuration, the CMR (CMR index) of the candidate beam and the CMR (CMR index) of the serving beam may be included in one list.

[0209] Figure 13A is a diagram showing a first example of Option 2 of the third embodiment. Figure 13A shows a CMR list including CMRs of candidate beams (CMRs #2 to #8) and a CMR of one serving beam (CMR #1).

[0210] Figure 13B is a diagram showing a second example of Option 2 of the third embodiment. Figure 13B shows a CMR list including CMRs (CMRs #3 to #8) of candidate beams and CMRs (CMRs #1 and #2) of multiple serving beams.

[0211] The number of serving beams to be configured may be defined in the specifications, or may be configured in the UE by higher layer signaling / physical layer signaling as a parameter such as the number per CMR resource or a flag.

[0212] The number of serving beams to be reported may be defined in the specification or may be configured in the UE by higher layer signaling / physical layer signaling.

[0213] For Rel. 19 MIMO, there may be one serving beam configuration / reporting. For Rel. 19 LTM, one serving beam configuration / reporting is preferred, but multiple serving beam configuration / reporting may also be applied (e.g., if filtered multi-beam quality is used for comparison).

[0214] [Aspect 3.2] The serving beam may be dynamically changed by an indicated TCI state (e.g., joint / DL TCI state) or a UE / event-triggered beam / cell switch procedure. Therefore, the configuration information for serving cell / beam reporting (CSI report configuration (CSI-ReportConfig)) received by RRC signaling alone may not be sufficient. Therefore, in the third embodiment, at least one of the following options may be applied:

[0215] <<Option A>> The UE may receive MAC CE / DCI to update the serving cell / beam configuration in the CSI reporting configuration (CSI-ReportConfig) for UE / event-triggered beam reporting for comparison between the serving beam and candidate beams. That is, the CSI reporting configuration of the serving cell / beam by RRC signaling may be dynamically updated by the MAC CE / DCI.

[0216] Option A-1: ​​The serving beam of the CMR list configured by RRC signaling (e.g., CSI reporting configuration) may be updated based on the new SSB / CSI-RS resource index configured / indicated by the MAC CE / DCI.

[0217] Option A-2: One or more CMRs in the CMR list configured by RRC signaling (e.g., CSI reporting configuration) may be updated to the CMR for the serving beam by a one-bit flag indication corresponding to the CMR transmitted by MAC CE / DCI. For example, one or more CMRs in the CMR list of a candidate beam may be updated to the CMR for the serving beam. When applying this method, there may be a restriction that the serving cell / beam to be updated must be in the CMR list configured by RRC signaling.

[0218] Option B: The UE may implicitly decide to update the serving cell / beam in the CMR configuration based on the indicated joint / DL TCI. This option may only be applied when one serving beam is configured.

[0219] Option B-1: The serving beam in the CMR configuration list via RRC signaling may be updated based on the new SSB / CSI-RS resource index corresponding to the indicated joint / DL TCI.

[0220] Option B-2: One CMR in the CMR configuration list configured by RRC signaling may be updated to become the serving cell based on the indicated joint / DL TCI. For example, a one-bit flag indication corresponding to the indicated joint / DL TCI and the CMR may be applied. When applying this method, there may be a restriction that the serving cell / beam to be updated must be in the CMR list configured by RRC signaling.

[0221] Depending on the above options applied, different re-indexing procedures for RSs may be configured.

[0222] 14 is a diagram showing an example of updating a serving beam for options A-1 and B-1 of the third embodiment. In the example of FIG. 14, CSI-RS #6 corresponding to the serving beam is updated to CSI-RS #8 based on the MAC CE / DCI or the corresponding joint / DL TCI. In this case, the UE determines that the serving beam has been updated to the beam corresponding to CSI-RS #8.

[0223] 15 is a diagram showing an example of updating a serving beam for options A-2 and B-2 of the third embodiment. In the example of FIG. 15, Flag = 0 is set for CSI-RS # 6 of the serving beam by MAC CE / DCI, or Flag = 0 is set for the joint / DL TCI state corresponding to CSI-RS # 6. Also, Flag = 1 is set for CSI-RS # 8 of the serving beam by MAC CE / DCI, or Flag = 1 is set for the joint / DL TCI state corresponding to CSI-RS # 8. In this case, the UE determines that the serving beam has been updated to the beam corresponding to CSI-RS # 8.

[0224] Aspect 3.2 may be applied to updating candidate beams, i.e., the serving beam in Aspect 3.2 may be replaced with the candidate beam.

[0225] [Aspect 3.3] A UE may receive a CSI reporting configuration (CSI-ReportConfig) for UE / event-triggered beam reporting via RRC signaling. The CSI reporting configuration may include configurations for multiple CMRs. In this configuration, it is not necessary to indicate whether each CMR is for a serving beam or a candidate beam.

[0226] The UE may further receive information for setting / instructing the UE to determine the serving beam or the candidate beam for each CMR in the above CMRs. This setting / instruction may be performed using a method similar to Option A or B in Aspect 3.2.

[0227] For example, the UE may receive a MAC CE / DCI that configures / indicates a serving beam or a candidate beam.

[0228] Alternatively, for example, the UE may implicitly determine the serving cell / beam in the CMR configuration based on the indicated joint / DL TCI. The UE may determine the CMR corresponding to the indicated joint / DL TCI as a serving beam or a candidate beam. When applying a method similar to Option A or B of Aspect 3.2, there may be a restriction that the configured / indicated serving cell / beam must be in the CMR list configured by RRC signaling. The number of serving beams to be indicated / updated may be defined in the specification, or may be configured / indicated to the UE by higher layer signaling / physical layer signaling.

[0229] Figure 16 is a diagram showing an example of the configuration of a serving beam in aspect 3.3. In Figure 16, it is assumed that the CMR list of the candidate beams / serving beams shown in the above figure is configured by RRC signaling (e.g., CSI reporting configuration). Then, the UE receives an indication of CSI-RS#8 / CMR#4 in the MAC CE / DCI that configures / instructs the serving beam. Alternatively, it is assumed that the joint / DL TCI indicated to the UE corresponds to CSI-RS#8 / CMR#4. In this case, the UE determines that the serving beam corresponds to CSI-RS#8 / CMR#4.

[0230] Although the instruction of the serving beam has been described in Figure 16, the instruction of the candidate beam may also be performed in the same manner. When the UE receives only the instruction of the serving beam, it may determine that the CSI-RS / CMR corresponding to the beam other than the serving beam in the CMR list corresponds to the candidate beam. When the UE receives only the instruction of the candidate beam, it may determine that the CSI-RS / CMR corresponding to the beam other than the candidate beam in the CMR list corresponds to the serving beam.

[0231] According to the third embodiment, the UE can appropriately send beam reports of the serving beam / candidate beam even when the serving beam / candidate beam is dynamically changed due to a beam switch / cell switch.

[0232] <Fourth embodiment> In the third embodiment, when one serving beam is set / updated, at least one example of the second embodiment may be applied to the explicitly set serving beam.

[0233] In the third embodiment, when multiple serving beams are set / updated, at least one example of the second embodiment may be applied to explicitly set serving beams.

[0234] <<Option 1>> The UE may always report the quality of one best serving beam. 1-1: The UE may report the index of the selected serving beam (best serving beam). 1-2: The UE does not report the index of the selected serving beam (best serving beam).

[0235] <<Option 2>> The UE does not always have to report the quality of the serving beam. The UE does not always have to report the RS index of the serving beam.

[0236] Option 3: The UE may always report a filtered / averaged value (one quality) of the qualities of multiple serving beams. The UE does not need to report the index of the serving beam.

[0237] <<Option 4>> The UE may receive configuration information indicating whether to report the quality of the serving beam via higher layer signaling / physical layer signaling.

[0238] 4-1: When reporting the quality of multiple serving beams, the UE may report the index of the selected serving beam (best serving beam).

[0239] 4-2: When reporting the quality of multiple serving beams, the UE may report the index of the selected serving beam (best serving beam).

[0240] When options 1 to 3 are applied, only one serving beam quality is transmitted (or not transmitted), which reduces communication capacity. When option 4 is applied, multiple serving beam qualities are reported, which allows comparison of serving beams on the network side.

[0241] When multiple serving beams are set / updated according to the third embodiment, the second embodiment may be applied to reporting of those serving beams.

[0242] In the fourth embodiment, different examples / options may be applied depending on the following settings, etc.: MIMO / LTM may be, for example, Rel. 19 MIMO / LTM. MIMO or LTM (Rel. 19). Intra-cell or inter-cell when MIMO is applied. Intra-cell or inter-cell when LTM is applied. Applied event (e.g., the above events A2, A3, A4, A5, etc.). UCI-based reporting or MAC CE-based reporting.

[0243] According to this embodiment, reporting regarding a serving beam (e.g., multiple serving beams) can be performed appropriately.

[0244] <Supplementary Information> <<Notification of Information to UE>> In the above-described embodiments, notification of any information to the UE [from a Network (NW) (e.g., a Base Station (BS))] (in other words, reception of any information from the BS by the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0245] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0246] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0247] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0248] <<Notification of Information from UE>> In the above-described embodiments, notification of any information from the UE [to the NW] (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0249] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0250] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0251] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0252] <<Regarding Application of Each Embodiment>> In a UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the above-mentioned embodiments may be applied (used) when one or more of the following conditions are met: - a higher layer parameter indicating the specific processes / operations / controls / assumptions / information is configured; - the specific processes / operations / controls / assumptions / information is determined based on related higher layer parameters; - the specific processes / operations / controls / assumptions / information is specified / activated / triggered by a MAC CE / DCI / UCI / resource / channel / RS; - a specific UE capability indicating (or related to) the specific processes / operations / controls / assumptions / information is reported or supported; - the application of the specific processes / operations / controls / assumptions / information is determined based on specific conditions.

[0253] The specific UE capability may indicate at least one of the following: - Supporting the specific processing / operation / control / assumptions / information; - Number of CMRs configured for candidate beams; - Number of serving beams to select / report; - Number of candidate beams to select / report.

[0254] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0255] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0256] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0257] (Supplementary Notes) The following inventions are supplementary notes regarding one embodiment of the present disclosure. [Supplementary Note 1] A terminal having, when Multi Input Multi Output (MIMO) is applied, a receiver that receives configuration information for a Channel State Information (CSI) report triggered by the terminal or an event, and a controller that performs CSI reporting of at least one of a serving beam and a candidate beam based on the configuration information. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the controller determines a serving beam for measurement based on an indicated Transmission Configuration Indication (TCI) state and performs CSI reporting of the determined serving beam. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the CSI report includes measurement results of a serving beam and candidate beams, and includes a measurement result of a best beam among the beams and a difference value from the measurement result of the best beam. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the receiving unit further receives a Medium Access Control Control Element (MAC CE) or Downlink Control Information (DCI) for updating a setting of a serving beam in the setting information.

[0258] (Supplementary Notes) The following inventions are further supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal having: a receiving unit that receives configuration information for a Channel State Information (CSI) report triggered by a terminal or an event when L1L2-triggered mobility (LTM) is applied; and a control unit that performs CSI reporting of at least one of a serving beam and a candidate beam based on the configuration information. [Supplementary Note 2] The terminal described in Supplementary Note 1, in which the control unit determines a serving beam for measurement based on an indicated Transmission Configuration Indication (TCI) state and performs CSI reporting of the determined serving beam. [Supplementary Note 3] The terminal described in Supplementary Note 1 or Supplementary Note 2, in which the CSI report includes measurement results of a serving beam and candidate beams, and includes a measurement result of a best beam among the beams and a difference value from the measurement result of the best beam. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the receiving unit further receives a Medium Access Control Control Element (MAC CE) or Downlink Control Information (DCI) for updating a setting of a serving beam in the setting information.

[0259] (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 above embodiments of the present disclosure or a combination thereof.

[0260] 17 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0261] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0262] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0263] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0264] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The location, number, shape, size, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as the base station 10.

[0265] The wireless communication system 1 may utilize multi-input multi-output (MIMO). For example, one cell may be formed by one antenna / base station 10, or may be formed by multiple antennas / base stations 10. One [virtual] cell (which may be called, for example, a supercell) may be composed of multiple [virtual] cells (which may be called, for example, subcells). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell with a quasi-static / dynamically variable physical range. In this case, the wireless communication system 1 may be called a cell-free system.

[0266] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0267] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0268] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0269] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 / Xn interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0270] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0271] The core network 30 may include network functions (Network Functions (NF)) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0272] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0273] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0274] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0275] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0276] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0277] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0278] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0279] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0280] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0281] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0282] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0283] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0284] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0285] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0286] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0287] (Base Station) Fig. 18 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0288] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0289] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0290] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0291] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0292] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0293] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0294] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0295] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0296] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0297] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0298] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0299] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0300] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0301] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0302] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0303] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0304] The base station 10 may be separated into three elements: a radio unit (RU), a distributed unit (DU), and a central unit (CU). For example, the RU may implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may implement higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement the functions of the PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer.

[0305] In the present disclosure, the base station 10 may include a single device that realizes all of the functions of the RU, DU, and CU, or may include multiple devices that each realize some of the functions of the RU, DU, and CU and are connected to each other. In the present disclosure, the base station 10 may be interchangeably read as RU / DU / CU.

[0306] The transceiver 120 may transmit configuration information for a Channel State Information (CSI) report triggered by a terminal or an event when Multi Input Multi Output (MIMO) or L1L2-triggered mobility (LTM) is applied.

[0307] The control unit 110 may control the reception of CSI reports for at least one of the serving beam and candidate beams transmitted based on the configuration information.

[0308] (User Terminal) Fig. 19 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0309] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0310] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0311] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0312] The transceiver unit 220 may 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 transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0313] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0314] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0315] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0316] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0317] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0318] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0319] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0320] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0321] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0322] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0323] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0324] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0325] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0326] The transceiver 220 may receive configuration information for a Channel State Information (CSI) report triggered by a terminal or an event when Multi-Input Multi-Output (MIMO) or L1L2-triggered mobility (LTM) is applied.

[0327] The control unit 210 may perform CSI reporting for at least one of the serving beam and the candidate beam based on the configuration information.

[0328] The control unit 210 may determine a serving beam for measurement based on the indicated Transmission Configuration Indication (TCI) state and perform CSI reporting of the determined serving beam.

[0329] The CSI report may include measurement results of the serving beam and candidate beams, and may also include measurement results of the best beam among each beam and a difference value from the measurement results of the best beam.

[0330] The transceiver 220 may further receive a Medium Access Control Element (MAC CE) or Downlink Control Information (DCI) for updating the serving beam configuration in the configuration information.

[0331] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0332] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0333] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 20 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and 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, etc.

[0334] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations 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 exclude some of the devices.

[0335] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0336] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0337] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0338] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0339] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0340] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0341] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0342] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0343] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0344] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0345] In addition, the devices included in the core network 30 (for example, network nodes that provide NF) may also be realized by the above-mentioned functional block / hardware configuration.

[0346] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0347] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0348] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0349] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0350] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0351] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0352] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0353] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0354] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0355] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0356] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0357] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0358] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0359] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0360] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0361] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0362] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0363] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0364] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0365] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. 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 minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0366] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0367] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0368] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0369] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0370] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0371] With respect to any information (e.g., variables, constants, parameters) described in the present disclosure, even if not specifically stated in the above embodiments, any first device (e.g., UE / base station) may notify any second device (e.g., base station / UE) of information indicating / specifying (or relating to) the value of the any information.

[0372] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0373] Note that 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), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0374] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0375] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0376] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0377] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0378] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0379] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0380] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0381] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0382] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0383] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0384] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0385] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0386] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0387] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0388] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0389] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0390] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0391] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0392] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0393] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0394] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0395] 21 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0396] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0397] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0398] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0399] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0400] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0401] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0402] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0403] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0404] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0405] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0406] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0407] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the 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 multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0408] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0409] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0410] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0411] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0412] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0413] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity 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, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0414] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0415] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0416] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0417] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0418] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ..." or "do ... (if the above "..." is a to-infinitive, a verb with "to")," etc. "does not expect ..." may be interchangeably read as "be not expected ..." or "does not ... (if the above "..." is a to-infinitive, a verb with "to")," etc. Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (for example, if apparatus A is a UE, apparatus B may be a base station).

[0419] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0420] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0421] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0422] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0423] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0424] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0425] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0426] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0427] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0428] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0429] Although the invention according to the present disclosure has been described in detail above, it is clear 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 description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. When L1L2-triggered mobility (LTM) is applied, a receiving unit that receives configuration information for Channel State Information (CSI) reporting triggered by a terminal or an event, and a control unit that performs CSI reporting for at least one of a serving beam and a candidate beam based on the configuration information. A terminal having the above components.

2. The terminal according to claim 1, wherein the control unit determines a serving beam for measurement based on an instructed Transmission Configuration Indication (TCI) state, and performs CSI reporting for the determined serving beam.

3. The CSI report according to claim 1 includes measurement results of a serving beam and measurement results of candidate beams, and includes measurement results of the best beam among each beam and a difference value from the measurement results of the best beam.

4. The receiving unit according to claim 1 further receives a Medium Access Control Control Element (MAC CE) or Downlink Control Information (DCI) for updating the serving beam configuration in the configuration information.

5. A wireless communication method for a terminal, comprising: a step of receiving configuration information for Channel State Information (CSI) reporting triggered by a terminal or an event when L1L2-triggered mobility (LTM) is applied; and a step of performing CSI reporting for at least one of a serving beam and a candidate beam based on the configuration information.

6. When L1L2-triggered mobility (LTM) is applied, a transmitting unit that transmits configuration information for Channel State Information (CSI) reporting triggered by a terminal or an event, and a control unit that controls reception of CSI reporting for at least one of a serving beam and a candidate beam transmitted based on the configuration information. A base station having the above components.

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