Terminal, wireless communication method and base station

Abstract

A terminal according to an embodiment of this disclosure includes a control unit that determines, based on a condition, the relaxation of mobility measurement in a radio resource control (RRC) idle or inactive state, and a transceiver unit that performs the measurement to which the relaxation is applied. An embodiment of this disclosure makes it possible to properly perform the relaxation of measurement or reporting.

Description

[Technical Field]

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

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) 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) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In NR, when a user terminal (User Equipment (UE)) establishes a Radio Resource Control (RRC) connection, it is in an RRC connected state (RRC_CONNECTED state) or an RRC inactive state (RRC_INACTIVE state). A UE that does not have an RRC connection is in an RRC idle state (RRC_IDLE state). These states are also called UE states, RRC states, etc.

[0006] UEs in the RRC connected state, RRC inactive state, and RRC idle state may be referred to as connected UEs, inactive UEs, and idle UEs, respectively.

[0007] In Rel.16 NR, relaxed measurement is introduced. Specifically, idle UEs / inactive UEs that meet certain conditions may apply relaxation of mobility measurement for cell reselection.

[0008] In the current NR specification, a connected UE uses periodically transmitted downlink (DL) reference signals (e.g., Synchronization Signal Block (SSB) / Channel State Information Reference Signal (CSI-RS)) for Radio Resource Management (RRM) measurements. Handover and cell selection / reselection are performed based on the UE's measurement / report results.

[0009] However, periodic RRM measurements and reports increase the load on UEs, and periodic reference signal transmission from base stations creates overhead in the network. Future wireless communication systems (e.g., NR in Rel. 17, 18, and later) require reducing the transmission of measurements, reports, and reference signals, but this has not yet been studied. If the transmission of measurements, reports, and reference signals cannot be reduced, the UE load may increase and communication throughput may be hindered.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately relax measurement / reporting. [Means for solving the problem]

[0011] A terminal according to one aspect of the present disclosure is in a Radio Resource Control (RRC) idle or inactive state. Device a control unit that determines relaxation of mobility measurements based on certain conditions, and a transceiver unit that performs the measurements to which the relaxation is applied, wherein the conditions are: The aforementioned The terminal is under the control of a specific base station or cell and receives information on the period during which the measurement is to be stopped, and the coverage area of ​​the specific base station or cell is equal to or smaller than a certain size. [Effects of the Invention]

[0012] According to one aspect of the present disclosure, measurement / reporting relaxation can be appropriately implemented. [Brief explanation of the drawings]

[0013] [Figure 1] Figure 1 shows the SS-RSRP intra-frequency absolute accuracy in FR1 in Table 10.1.2.1.1-1 of 3GPP TS38.133 V16.7.0(2021-03). [Figure 2]FIG. 2 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 3] FIG. 3 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 4] FIG. 4 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 5] FIG. 5 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] (UE state) In NR, when a user terminal (User Equipment (UE)) establishes a Radio Resource Control (RRC) connection, it is in an RRC connected state (RRC_CONNECTED state) or an RRC inactive state (RRC_INACTIVE state). A UE that does not have an RRC connection is in an RRC idle state (RRC_IDLE state). These states are also called UE states, RRC states, etc.

[0015] UEs in the RRC connected state, RRC inactive state, and RRC idle state may be referred to as connected UEs, inactive UEs, and idle UEs, respectively.

[0016] Depending on the UE state, the UE may behave differently, for example, an idle UE may monitor the paging channel, perform neighboring cell measurements and cell selection / reselection, and acquire system information.

[0017] Inactive UEs retain RRC / Non Access Stratum (NAS) / Access Stratum (AS) context. Since the operation of inactive UEs is almost the same as that of idle UEs, they can operate with low power consumption. Because the context is retained at each node (UE / base station / core network), inactive UEs can return to an RRC connected state with a relatively small number of signals.

[0018] Alternatively or in addition to idle / inactive UE behavior, connected UEs may monitor control channels associated with shared data channels (e.g., physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH)) to determine data scheduled for them, provide channel quality / feedback information, and perform neighbor cell measurements and measurement reports.

[0019] (Mobility measurement) In NR, idle UEs / inactive UEs perform mobility measurements for cell reselection.

[0020] In the present disclosure, mobility measurement may mean at least one of intra-frequency (or same-frequency) measurement, inter-frequency (or different-frequency) measurement, inter-RAT measurement, intra-frequency cell measurement, inter-frequency cell measurement, inter-RAT frequency cell measurement, etc.

[0021] In mobility measurements, the UE identifies a new cell (intra-frequency cell / inter-frequency cell / inter-RAT frequency cell) and measures the synchronization signal reference signal received power (SS-RSRP) and synchronization signal reference signal received quality (SS-RSRQ) for the identified cell.

[0022] The UE receives the detect,X ) the UE may evaluate whether a new detectable cell satisfies the reselection criteria. measure,X ) for the identified cell. evaluate,X ) may perform filtering of SS-RSRP / SS-RSRQ measurements for cells that have been detected but not yet reselected, such that it can be assessed that the cell meets the reselection criteria.

[0023] Note that these Xs may be, for example, Intra, Inter, EUTRAN, etc., which correspond to intra-frequency measurement, inter-frequency measurement, and inter-RAT measurement, respectively. detect,X / T measure,X / T evaluate,X may be different for each X.

[0024] (relaxed measurement) In Rel.16 NR, relaxed measurement is introduced. Specifically, idle UEs / inactive UEs that meet certain conditions may apply relaxation of mobility measurements for cell reselection. In this disclosure, "relaxed measurement" may mean limiting the required measurements.

[0025] In Rel.16 NR, RRC parameters for relaxed measurement (relaxedMeasurement) may be notified to the UE using System Information Block (SIB) 2. The relaxedMeasurement may further include a parameter indicating criteria for detecting that the UE is not at a cell edge (cellEdgeEvaluation) or a parameter indicating criteria for detecting that the UE has low mobility (lowMobilityEvaluation).

[0026] Idle UE / inactive UE is when lowMobilityEvaluation is set and (Srxlev Ref -Srxlev) SearchDeltaP If it satisfies the following equation, it may choose to apply relaxation measurement to mobility measurement. Satisfying this equation may mean that the UE has low mobility.

[0027] Here, Srxlev is the current cell selection RX level value (unit: decibel (dB)), and Srxlev Ref is the reference Srxlev value of the serving cell (after selecting / reselecting a new cell), and S SearchDeltaP is the threshold of variation of the Srxlev value for relaxation measurement. SearchDeltaP may be signaled by lowMobilityEvaluation.

[0028] Idle UE / inactive UE is when cellEdgeEvaluation is set and Srxlev>S SearchThresholdP (and Squal>S SearchThresholdQ (If S SearchThresholdQ If (if (is set)) is satisfied, it may choose to apply relaxation measurements to mobility measurements. Satisfying this equation (or these equations) may mean that the UE is not at the cell edge.

[0029] ​ where Squal is the current cell selection quality value (unit: decibel (dB)), and S SearchThresholdP is the threshold value of Srxlev for relaxation measurement, and S SearchThresholdQ is the Squal threshold for relaxation measurements. SearchThresholdP , S SearchThresholdQ etc. may be notified by cellEdgeEvaluation.

[0030] When relaxation measurements are applied to mobility measurements, the T detect,X / T measure,X / T evaluate,X As the T detect,X / T measure,X / T evaluate,X A larger value (for example, three times larger value) is applied compared to , which lengthens the measurement cycle for mobility measurement, thereby reducing the number of measurements (frequency).

[0031] In the current NR specifications, a connected UE uses periodically transmitted downlink (DL) reference signals (e.g., synchronization signal blocks (SSBs) / channel state information reference signals (CSI-RSs)) for radio resource management (RRM) measurements. Handover and cell selection / reselection are performed based on the UE's measurement / report results. Note that RRM measurements may refer to measurements configured by the RRC's MeasConfig information element, MeasObjectNR information element, etc. (e.g., SSB-based RRM measurements / CSI-RS-based RRM measurements).

[0032] However, periodic RRM measurements and reports increase the load on UEs, and periodic reference signal transmission from base stations creates overhead in the network. Future wireless communication systems (e.g., NR in Rel. 17, 18, and later) require reducing the transmission of measurements, reports, and reference signals, but this has not yet been studied. If the transmission of measurements, reports, and reference signals cannot be reduced, the UE load may increase and communication throughput may be hindered.

[0033] Therefore, the present inventors have conceived a method for relaxing UE measurement / reporting. With this method, even when new network topologies are adopted or UE types become more diverse in future wireless communication systems (e.g., NR after Rel. 17 or 18), it is possible to omit / relax RRM measurements and preferably achieve reductions in UE load / UE power consumption, overhead, etc.

[0034] 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.

[0035] In the present disclosure, "A / B" may also mean "at least one of A and B."

[0036] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0037] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The 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.

[0038] The physical layer signaling may be, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0039] In the present disclosure, the terms activate, deactivate, indicate, select, configure, update, determine, etc. may be read interchangeably.

[0040] In the present disclosure, the terms panel, beam, panel group, beam group, Uplink (UL) transmitting entity, TRP, spatial relationship information (SRI), spatial relationship, control resource set (CORESET), Physical Downlink Shared Channel (PDSCH), codeword, base station, predetermined antenna port (e.g., Demodulation Reference Signal (DMRS) port), predetermined antenna port group (e.g., DMRS port group), predetermined group (e.g., Code Division Multiplexing (CDM) group, predetermined reference signal group, CORESET group), predetermined resource (e.g., predetermined reference signal resource), predetermined resource set (e.g., predetermined reference signal resource set), CORESET pool, PUCCH group (PUCCH resource group), spatial relationship group, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state (unified TCI state), and so on are used interchangeably. state), QCL, etc. may be read interchangeably.

[0041] In this disclosure, the terms index, ID, indicator, and resource ID may be interchangeable. Also, in this disclosure, the terms sequence, list, set, group, cluster, and subset may be interchangeable.

[0042] In the following embodiments, the measurement will be basically described assuming that it is an RRM measurement, but is not limited to this. In other words, in the present disclosure, the terms measurement, RRM measurement, intra-frequency (or same-frequency) measurement, inter-frequency (or different-frequency) measurement, inter-RAT measurement, other-operator (or inter-operator) frequency measurement, mobility measurement, Radio Link Monitoring (RLM) measurement, beam management measurement, beam measurement, measurement for beam failure detection, measurement for candidate beam discovery, Channel State Information (CSI) measurement, Layer 1 (L1) measurement, Layer 2 (L2) measurement, Layer 3 (L3) measurement, etc. may be read interchangeably.

[0043] Furthermore, measurements in the following embodiments will be described assuming that they are basically measurements based on reference signals (e.g., SSB, CSI-RS, DMRS, SRS) (measurements in reference signal resources), but are not limited to this. In other words, in the present disclosure, measurements may refer to measurements performed by a UE / base station / Integrated Access Backhaul (IAB) node / satellite / High Altitude Platform Station (HAPS) / High Altitude Pseudo Satellite (HAPS) / relay station using at least one of a reference signal and other signals / channels (e.g., PDCCH, PDSCH, PRACH, PUCCH, PUSCH).

[0044] Note that the reference signal in the present disclosure may include (or be interpreted as) an interference measurement reference signal, an interference measurement resource, and the like.

[0045] Furthermore, measurement in the following embodiments may refer to measuring (obtaining) at least one of received power (e.g., RSRP), received quality (e.g., RSRQ or SINR, etc.), received strength (e.g., RSSI), CSI, etc. in a cell (serving cell and / or neighboring cell).

[0046] Note that measurement in this disclosure may be read as measurement / report, and report in this disclosure may mean a report based on (or in response to) measurement.

[0047] (Wireless communication method) First Embodiment The first embodiment relates to conditions for implementing relaxation of measurement / reporting in an RRC connected state.

[0048] The UE may perform measurement / reporting relaxation if any one or a combination of the following conditions 1-1 to 1-5 is met: Condition 1-1: The UE transmits (reports) specific signals / information. Condition 1-2: The UE is determined to meet the relaxation criteria. Condition 1-3: Measurement is performed using an uplink (UL) signal (e.g., an UL reference signal). Condition 1-4: The UE is under the control of a specific base station / cell. Condition 1-5: The UE receives a specific signal / information.

[0049] [Condition 1-1] The specific signal / information in the above condition 1-1 may be, for example, at least one of the following: First information (which may be capability information or incapability information, for example) indicating that the UE does not support (or does not perform) mobility measurements, Second information (e.g., capability information) indicating that the UE supports (or performs) relaxed measurement / reporting under certain conditions; Third information indicating a mobility type of the UE; Fourth information indicating that the UE stops or starts measurements.

[0050] In the present disclosure, terms such as stop, pause, omission, and reduction may be interchangeable. In the present disclosure, terms such as start, resume, return, and increase may be interchangeable.

[0051] Regarding the first information, the above "does not support mobility measurement" may mean that mobility measurement is not supported at all, or that mobility measurement is supported under certain conditions (e.g., relaxed measurement) but not supported under other conditions. A UE that does not support mobility measurement may, for example, be assumed not to perform at least one of cell reselection and handover. A UE that does not move (e.g., a fixed location UE) does not need to perform cell reselection, handover, etc., and therefore the processing load on the UE can be suitably reduced.

[0052] With respect to the first information and the second information, the "certain condition" may correspond to at least one of the above conditions 1-1 to 1-5.

[0053] Regarding the third information, the mobility type may correspond to at least one of a fixed location UE, a movable / moving UE, a no mobility UE, a low mobility UE, a middle mobility UE, a high mobility UE, a cell-edge UE, a not-cell-edge UE, etc.

[0054] In the present disclosure, the mobility type to which the measurement / reporting relaxation is applied may correspond to at least one of these, for example, a fixed location UE, a low mobility UE, or the like.

[0055] Additionally, together with or instead of the information indicating the mobility type, information indicating at least one of UE location information (e.g., latitude and longitude), UE movement speed, UE acceleration, UE movement direction, etc. may be used as the third information. Note that the movement speed / acceleration for applying the measurement / reporting relaxation may correspond to a value equal to or less than a specific threshold. The specific threshold may be determined in advance by a specification, or may be notified to the UE by the base station using higher layer signaling (e.g., RRC parameters, MAC CE), physical layer signaling (e.g., DCI), or a combination thereof, or may be determined based on the UE capability.

[0056] The UE may determine the mobility type to which it currently belongs based on at least one of the measurement results and the acquired location information / movement speed / acceleration results.

[0057] In the present disclosure, the location information / movement speed / acceleration may be acquired by the UE / base station based on a satellite positioning system (e.g., Global Navigation Satellite System (GNSS), Global Positioning System (GPS), etc.), or may be acquired / corrected based on UE-to-UE communication / UE-to-base station communication (e.g., may be determined based on the Doppler shift (or parameters related to QCL) of a reference signal transmitted from the base station).

[0058] The fourth information may include information about a period for stopping measurement. In this case, for example, when the UE transmits fourth information including information about a period for stopping measurement, the UE may stop measurement for the period after the transmission and resume measurement after the period has elapsed. Also, when the UE transmits fourth information indicating that measurement is to be stopped but not including information about the period for stopping measurement, the UE may stop measurement until it next transmits fourth information indicating that measurement is to be started.

[0059] The information on the period for stopping measurement may include at least one of information on the length of the period, information on the cycle of the period, information on the offset of the period, and the like.

[0060] The period for stopping measurement may be determined in advance by a specification, or may be notified to the UE from the base station using higher layer signaling (e.g., RRC parameters, MAC CE), physical layer signaling (e.g., DCI), or a combination thereof, or may be determined based on UE capabilities. In this case, when transmitting the fourth information, the UE may stop measurement for the period after the transmission and resume measurement when the period elapses.

[0061] The fourth information may or may not include information (e.g., a bit) explicitly indicating that measurement is to be stopped / started. In the latter case, the UE may determine whether to stop / start measurement based on whether measurement is currently stopped and whether to transmit the fourth information. The information on the period during which measurement is to be stopped may correspond to information explicitly indicating that measurement is to be stopped.

[0062] In the above description of the fourth information, stop and start may be interpreted as interchangeable (reversely).

[0063] Since the fourth information indicates the start (or end) of measurement relaxation, it may be called measurement relaxation report information, measurement relaxation activation / deactivation information, measurement relaxation trigger information, etc. Furthermore, when measurement / report relaxation is performed based on an arbitrary condition, the fourth information may be used simply to notify the base station of measurement / report relaxation.

[0064] The UE may transmit at least one of the first to fourth information to a network (e.g., a base station) using higher layer signaling (e.g., an RRC parameter, a MAC CE), physical layer signaling (e.g., UCI), or a combination thereof. For example, CSI indicating the third or fourth information may be newly defined, and the third or fourth information may be transmitted by the CSI.

[0065] The first to fourth information may be transmitted explicitly or implicitly using a specific channel / reference signal (e.g., PRACH, PUCCH, PUSCH, SRS, DMRS, or PTRS). For example, at least one of the first to fourth information may be reported implicitly by using a signal sequence of a transmitted channel / reference signal that is a specific sequence associated with at least one of the first to fourth information.

[0066] [Condition 1-2] The above relaxation criteria may be determined in advance by a specification, or may be notified to the UE by the base station using higher layer signaling (e.g., RRC parameters, MAC CE), physical layer signaling (e.g., DCI), or a combination thereof, or may be determined based on the UE capabilities.

[0067] The relaxation criteria may be based on measurement results, for example, a criterion for determining whether the UE is in a no mobility state or a criterion for determining whether the UE is in at least one of the mobility types described above.

[0068] The measurement results may include at least one of the measurement results and the acquired results of position information / movement speed / acceleration.

[0069] The criteria based on the measurement results in condition 1-2 may be criteria related to RRM measurements (or mobility measurements), criteria related to Layer 1 measurements (e.g., criteria related to L1-RSRP / RSRQ), criteria related to beam measurements (e.g., criteria for determining beam fault detection, such as Block Error Rate (BLER) for the radio link quality of a reference signal for beam fault detection), criteria related to measurements for positioning (e.g., criteria related to Positioning Reference Signal (PRS) measurements), or criteria that take into account multiple of these. Note that the relaxation criteria may differ for each mobility type to which the UE corresponds, or the relaxation criteria may be the same for multiple mobility types.

[0070] [Condition 1-3] In the above conditions 1-3, the UE transmits an UL signal, and the base station performs measurements using the UL signal. The transmission of the UL signal for this measurement may be configured in the UE by the RRM measurement configuration (MeasConfig information element of RRC). Note that in Rel.15 / 16 NR, only SSB / CSI-RS measurements could be configured in the RRM measurement configuration.

[0071] For example, the UL signal may be an SRS or another reference signal (eg, a DMRS).

[0072] The UL signal may be configured in the UE by a configuration for SRS (SRS-Config information element of RRC). For example, if a value indicating RRM measurement (e.g., "rrmMeasurement") is configured as usage in an SRS resource set configuration (SRS-ResourceSet) or an SRS resource configuration (SRS-Resource) included in the configuration for SRS, the SRS corresponding to the SRS resource set configuration or the SRS resource configuration may correspond to the UL signal of Conditions 1-3.

[0073] The base station may transmit to the UE a trigger signal / information for triggering the UL signal of conditions 1 to 3. Based on the trigger signal / information, the UE may transmit the UL signal aperiodically / semi-persistently. The trigger signal / information may be notified by higher layer signaling (e.g., RRC parameters, MAC CE), physical layer signaling (e.g., DCI), or a combination thereof, or may be an SRS request field included in the DCI.

[0074] Regarding the relaxation of conditions 1-3, the UE measurement in the present disclosure may be interpreted as the UE transmitting the UL signal (or the base station measuring the UL signal). Furthermore, regarding the relaxation of conditions 1-3, the UE report in the present disclosure may be interpreted as the UE receiving a report from the base station (or the base station reporting).

[0075] [Condition 1-4] The specific base station / cell in the above conditions 1-4 may be a base station / cell that uses a specific frequency band (e.g., FR4 covering 52.6 GHz to 71 GHz, or FR5 covering 95 GHz to 325 GHz), or a base station / cell that uses a specific frequency (a frequency above a certain value), or a base station / cell whose coverage area is less than or greater than a certain size, or a base station / cell that communicates in accordance with a specific 3GPP release (e.g., Rel. 18).

[0076] [Condition 1-5] The specific signal / information in the above conditions 1-5 may be information indicating that mobility measurements are not to be performed (or are prohibited).

[0077] The specific signal / information in the above condition 1-5 may be the fourth information described in condition 1-1. The above-mentioned fourth information may be notified from the base station to the UE using higher layer signaling (e.g., RRC parameters, MAC CE), physical layer signaling (e.g., DCI), or a combination thereof. For example, when the UE receives the fourth information including information on a period for stopping measurement, the UE may stop measurement during the period and resume measurement after the period has elapsed.

[0078] The specific signal / information in the above conditions 1-5 may be notified from the base station to the UE using higher layer signaling (e.g., RRC parameters, MAC CE), physical layer signaling (e.g., DCI), or a combination thereof. Also, the specific signal / information may be notified to the UE explicitly or implicitly using a specific channel / reference signal (e.g., SSB, PDCCH, PDSCH, CSI-RS, DMRS).

[0079] According to the first embodiment described above, it is possible to appropriately control the relaxation of measurement / reporting in the RRC connected state.

[0080] <Second embodiment> The second embodiment relates to the content of relaxation of measurement / reporting in the RRC connected state.

[0081] Relaxing measurement / reporting may mean omitting (not performing) some or all of the measurements / reports based on a certain measurement / reporting setting, or it may mean performing measurements / reports with a reduced frequency under that setting (e.g., reducing the number of measurements or lengthening the measurement interval).

[0082] For example, when SSB-based RRM measurement is relaxed, the UE may omit measuring some SSBs for which the SSB-ToMeasure information element in the RRC is set to measure, and may measure SSBs at fewer positions than the set positions (e.g., symbol positions or patterns corresponding to SSB indexes).

[0083] Furthermore, when CSI-RS-based RRM measurement is relaxed, the UE may omit measurement of some of the CSI-RSs to be measured that are configured by the RRC CSI-RS-ResourceConfigMobility information element. For example, the UE may measure the CSI-RS at a longer period than the configured period, at resource blocks with a narrower bandwidth than the configured resource blocks, at fewer symbols than the configured symbols, or at a density lower than the configured density.

[0084] As already mentioned, "A / B" may mean "at least one of A and B," so "measurement / reporting is relaxed" may mean "measurement is relaxed," "reporting is relaxed," or "both measurement and reporting are relaxed." Furthermore, the degree of relaxation of measurement and the degree of relaxation of reporting may be the same (for example, the frequency is reduced by the same percentage) or may be different.

[0085] In the measurement relaxation, the frequency of measurements may be changed by relaxing the threshold or range of accuracy of the measurement values ​​(e.g., RSRP / RSRQ) that must be met in the measurement. For example, the current standard (3GPP TS38.133) specifies that for measurement reporting, the reported RSRP / RSRQ / RS-SINR measurements must meet certain accuracy requirements.

[0086] Figure 1 shows the SS-RSRP intra-frequency absolute accuracy in FR1 in Table 10.1.2.1.1-1 of 3GPP TS38.133 V16.7.0(2021-03).

[0087] In Figure 1, the value shown in the "Accuracy" column is the accuracy that must be met. The accuracy is described as ±4.5 [dB] or ±8 [dB] for each band (or band group) under normal conditions. For example, when a UE measures SS-RSRP for a certain period or a certain number of times, if the difference between multiple SS-RSRP measurement results is within this accuracy range (e.g., between -4.5 and +4.5), the accuracy requirement is met, and the UE may report an SS-RSRP based on these measurement results.

[0088] When the measurement relaxation is applied, the UE may determine that the accuracy to be met is an accuracy (looser accuracy) with various values / ranges increased / decreased / extended / narrowed as shown in Figure 1 compared to when the relaxation is not applied. For example, when the measurement relaxation is applied, the UE may assume that the value shown in the "Accuracy" column of Figure 1 for the SS-RSRP intra-frequency absolute accuracy in FR1 is ±10 (extended range) instead of ±4.5 as shown in the normal state.

[0089] In addition, in the measurement relaxation, in addition to or instead of the value in the "Accuracy" column, at least one of the values / ranges in the "Conditions" column may be changed (e.g., increased / decreased / expanded / narrowed). For example, in the measurement relaxation, the range of possible values ​​(or the minimum Io / maximum Io shown in FIG. 1) of Io (total received power density including signal and interference) specified for at least one of the band (or band group), bandwidth, and SCS (e.g., SCS of a reference signal (SSB / CSI-RS, etc.)) may be changed (e.g., increased / decreased / expanded / narrowed).

[0090] Furthermore, in relaxing measurements, the value / range of Es / Iot (formally, the hat (^) above E as shown in FIG. 1) specified for a band (or band group) may be changed (e.g., increased / decreased / expanded / narrowed). Note that Es / Iot is the ratio of Es, which is the received energy per resource element during the effective part of a symbol (where power is normalized with respect to the subcarrier spacing), to Iot, which is the received power spectral density of total noise and interference for a given resource element (where power is integrated over the resource element and then normalized with respect to the subcarrier spacing).

[0091] Relaxing the measurement accuracy allows measurements / reports to be performed less frequently / over shorter periods, thereby reducing the load on the UE.

[0092] As shown in the first embodiment, the UE may relax the measurement / reporting (omit or reduce the frequency of measurement / reporting) for a certain period of time based on a notification from the base station.

[0093] Also, the measurement / report interval may vary depending on the value of the measurement result. For example, the UE may determine the measurement ( / report) interval based on at least one of the following: If the measurement result is less than a first threshold, determining that the measurement ( / reporting) period is a first value; If the measurement result is less than a second threshold, determining that the measurement ( / reporting) period is a second value; If the measurement result is below the third threshold, it is decided not to measure (or report) for the period of the third value.

[0094] The first, second, and third thresholds may be different from each other, and may be determined in advance by a specification, or may be notified to the UE by the base station using higher layer signaling (e.g., RRC parameters, MAC CE), physical layer signaling (e.g., DCI), or a combination thereof, or may be determined based on the UE capabilities.

[0095] The first, second, and third values ​​may be different from each other, and may be determined in advance by a specification, or may be notified to the UE by the base station using higher layer signaling (e.g., RRC parameters, MAC CE), physical layer signaling (e.g., DCI), or a combination thereof, or may be determined based on the UE capabilities.

[0096] In addition, when measurement relaxation is applied, the base station may omit or reduce the frequency of transmitting reference signals that will no longer be used for measurements by the UE.

[0097] According to the second embodiment described above, it is possible to appropriately control the relaxation of measurement / reporting in the RRC connected state.

[0098] <Third embodiment> A third embodiment relates to relaxation of measurements in RRC idle / RRC inactive state.

[0099] The control relating to relaxation of measurements / reports in the RRC connected state shown in the first and second embodiments may be used as control relating to relaxation of measurements in the RRC idle / RRC inactive state.

[0100] For example, an idle UE / inactive UE may determine measurement relaxation based on the mobility type described in the first embodiment. For example, an idle UE / inactive UE may apply measurement relaxation if it is a fixed location UE or a low mobility UE.

[0101] Furthermore, an idle UE / inactive UE may determine to relax the measurement when it receives specific signals / information as described in conditions 1-5 of the first embodiment. Although an idle UE / inactive UE can receive fewer signals / channels than a connected UE, it may receive the specific signals / information using at least one of the following: Short messages sent by DCI with Cyclic Redundancy Check (CRC) bits scrambled with a Radio Network Temporary Identifier (RNTI) (e.g., Paging RNTI (P-RNTI)), A paging message transmitted by a PDSCH scheduled by the DCI; Paging channel, System information transmitted using MIB / SIB, PBCH included in SSB, ·SSB.

[0102] In addition, the idle UE / inactive UE may determine (or be implicitly notified of) the specific signal / information based on the subcarrier spacing applied to the SSB and the DMRS for the PBCH included in the SSB (at least one of the position, pattern, sequence, etc.).

[0103] Furthermore, idle UE / inactive UE may determine whether to relax measurement requirements based on the measurement results as described in condition 1-2 of the first embodiment. Note that in the third embodiment, the measurements in the first and second embodiments may be replaced with measurements of SS-RSRP / SS-RSRQ / Srxlev / Squal, for example.

[0104] In the third embodiment, the relaxation of the measurements shown in the first and second embodiments may mean relaxation of the measurements of SS-RSRP / SS-RSRQ / Srxlev / Squal, or T detect,X / T measure,X / T evaluate,X (e.g., applying a larger value than in the unrelaxed case). detect,X / T measure,X / T evaluate,X is the T of relaxation measurements in the existing Rel.16 NR. detect,X / T measure,X / Tevaluate,X may be a different value.

[0105] According to the third embodiment described above, it is possible to appropriately control the relaxation of measurement / reporting in the RRC connected state.

[0106] <Other> It should be noted that the relaxation of measurements / reports in each of the above-described embodiments may be applied to one or more of intra-frequency measurements, inter-frequency measurements, and inter-RAT measurements.

[0107] Furthermore, the relaxation of measurement / reporting in each of the above-described embodiments may be applied to, for example, relaxation of CSI measurement / CSI reporting, as described by replacing the measurement. Furthermore, when CSI measurement is relaxed, the UE may omit measuring some of the CSI-RS to be measured that are configured by the NZP-CSI-RS-Resource information element of the RRC. For example, the UE may measure the CSI-RS at a period longer than the configured period, may measure using resource blocks with a narrower bandwidth than the configured resource blocks, may measure using fewer symbols than the configured symbols, or may measure assuming a density lower than the configured density.

[0108] Furthermore, when CSI reporting is relaxed, the UE may omit some CSI reporting for the CSI reporting configured by the CSI-ReportConfig information element of the RRC. For example, the UE may report CSI at a longer period than the configured period.

[0109] Note that the CSI measurement / reporting that can be relaxed may be any one of periodic CSI measurement / reporting, semi-persistent CSI measurement / reporting, and aperiodic CSI measurement / reporting, or may be a combination of these (e.g., all of them). Furthermore, when relaxation of CSI measurement / CSI reporting is applied, the UE may relax only CSI measurement / CSI reporting corresponding to a specific index (e.g., CSI reporting configuration ID, CSI resource configuration ID, non-zero power CSI-RS resource ID, non-zero power CSI-RS resource set ID, etc.).

[0110] Each measurement / reporting configuration in RRC may include information on whether mitigation is enabled when the mitigation measurement / reporting is applied, in which case the UE may apply mitigation for the measurements / reports for which mitigation is enabled by the information.

[0111] It should be noted that at least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0112] The specific UE capabilities may indicate at least one of the following: · Whether or not to support relaxation of measurements; · Whether to support control / measurement / reporting based on mobility type.

[0113] Furthermore, the above-mentioned specific UE capabilities may be capabilities that are applied across all frequencies (commonly regardless of frequency), capabilities for each frequency (e.g., cell, band, BWP), capabilities for each frequency range (e.g., FR1, FR2, FR3, FR4, FR5), or capabilities for each subcarrier spacing.

[0114] Furthermore, the specific UE capability may be a capability that is applied across all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (for example, Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0115] At least one of the above-described embodiments may be applied when specific information related to the above-described embodiments is configured in the UE by higher layer signaling (if not configured, for example, the operation of Rel. 15 / 16 applies). For example, the specific information may be information indicating that measurement relaxation (or control / measurement / reporting based on mobility type) is enabled, any RRC parameter for a specific release (e.g., Rel. 18), etc. Furthermore, the UE may be configured using higher layer parameters as to which of the above-described embodiments / cases / conditions control should be performed based on.

[0116] (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.

[0117] 2 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication 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).

[0118] 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.

[0119] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the 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.

[0120] 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 the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0121] 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 locations and numbers of the cells and user terminals 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 base station 10.

[0122] 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 (CC) and dual connectivity (DC).

[0123] 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 above 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 be a frequency band higher than FR2.

[0124] 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.

[0125] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, 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.

[0126] 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.

[0127] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0128] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio 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).

[0129] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0130] 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.

[0131] 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)), etc. may be used as an uplink channel.

[0132] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0133] 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.

[0134] 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 an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0135] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search 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 a CORESET associated with a certain search space based on the search space configuration.

[0136] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0137] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement 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.

[0138] 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.

[0139] 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, 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 as DL-RS.

[0140] 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 the SS (PSS, SSS) and the PBCH (and 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 reference signals.

[0141] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. 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).

[0142] (base station) 3 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.

[0143] 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.

[0144] 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.

[0145] 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 to be transmitted as signals, control information, sequences, etc., 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.

[0146] 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.

[0147] The transmitting / receiving unit 120 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 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0148] 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 pertains, such as an array antenna.

[0149] 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.

[0150] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0151] The transceiver 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.

[0152] The transceiver 120 (transmission processor 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.

[0153] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0154] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0155] 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.

[0156] 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.

[0157] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0158] 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.

[0159] The control unit 110 may determine, based on certain conditions, that relaxation of at least one of measurements and reports for Radio Resource Management (RRM) is to be applied in a user terminal 20 in a Radio Resource Control (RRC) connected state. This determination may be made, for example, by receiving measurement relaxation trigger information from the user terminal 20.

[0160] The transceiver unit 120 may transmit to the user terminal 20 the signal (for example, SSB, CSI-RS) used for the measurement to which the relaxation is applied.

[0161] Furthermore, the control unit 110 may determine that relaxation of mobility measurements is to be applied based on certain conditions for a user terminal 20 in a Radio Resource Control (RRC) idle or inactive state. This determination may be made, for example, by receiving measurement relaxation trigger information from the user terminal 20.

[0162] The transceiver unit 120 may transmit to the user terminal 20 the signal (for example, SSB, CSI-RS) used for the measurement to which the relaxation is applied.

[0163] Furthermore, the control unit 110 may determine, based on certain conditions, that relaxation of at least one of measurement and reporting of Channel State Information (CSI) is to be applied in a user terminal 20 in a Radio Resource Control (RRC) connected state. This determination may be made, for example, by receiving measurement relaxation trigger information from the user terminal 20.

[0164] The transceiver 120 may transmit to the user terminal 20 a signal (for example, CSI-RS) used for the measurement to which the mitigation is applied.

[0165] (user terminal) 4 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 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0166] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, 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.

[0167] 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, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0168] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also 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.

[0169] 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 from 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.

[0170] 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.

[0171] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0172] 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.

[0173] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0174] The transceiver 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.

[0175] The transceiver 220 (transmission processor 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.

[0176] Whether or not to apply DFT processing may be based on the setting of a transform precoder. When a transform precoder 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 when a transform precoder is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0177] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0178] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0179] The transceiver 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 to acquire user data, etc.

[0180] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, 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.

[0181] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0182] Note that the control unit 210 may determine, in a Radio Resource Control (RRC) connected state, whether to relax at least one of the measurements and reports for Radio Resource Management (RRM) based on a certain condition. This condition may be, for example, that specific information is transmitted, that the measurement results satisfy a relaxation criterion, or that the user terminal 20 is under the control of a specific base station 10 or cell.

[0183] The transceiver 220 may perform the measurements and / or reporting to which the mitigation applies.

[0184] Furthermore, the control unit 210 may determine whether to relax mobility measurements in a Radio Resource Control (RRC) idle or inactive state based on a certain condition. This condition may be based on the mobility type of the user terminal 20, on receiving information indicating that mobility measurements will not be performed, or on the measurement results satisfying a relaxation criterion, for example.

[0185] The transceiver 220 may perform the measurements to which the relaxations are applied.

[0186] Furthermore, the control unit 210 may determine, based on a certain condition, whether to relax at least one of the measurement and reporting of Channel State Information (CSI) in a Radio Resource Control (RRC) connected state. This condition may be, for example, that specific information is transmitted, that the measurement result satisfies a relaxation criterion, or that the user terminal 20 is under the control of a specific base station 10 or cell.

[0187] The transceiver 220 may perform the measurements and / or reporting to which the mitigation applies.

[0188] (Hardware configuration) 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 also be realized by combining the single device or multiple devices with software.

[0189] 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 mentioned above, the implementation method of each is not particularly limited.

[0190] 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. 5 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.

[0191] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read 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.

[0192] 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.

[0193] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined 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.

[0194] 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), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0195] 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 realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0196] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0197] Storage 1003 is a computer-readable recording medium and may be constituted by 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, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0198] 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.

[0199] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0200] 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.

[0201] 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 such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0202] (Variation) Note that terms explained 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.

[0203] 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.

[0204] 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, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0205] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0206] 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.

[0207] 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.

[0208] 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 a subframe and a 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.

[0209] 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. However, the definition of TTI is not limited to this.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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 equal to or greater than 1 ms.

[0214] 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 also be determined based on numerology.

[0215] 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. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0216] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0217] 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.

[0218] A Bandwidth Part (BWP), which may also be referred to as a fractional 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 given BWP and numbered within that BWP.

[0219] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0220] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given channel / signal outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be replaced with "BWP."

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, 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.

[0228] Note that the physical layer signaling may be called 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 called 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).

[0229] 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).

[0230] 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).

[0231] 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.

[0232] 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), then these wired and / or wireless technologies are included within the definition of transmission media.

[0233] 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).

[0234] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0235] In this 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.

[0236] 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 divided 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 term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0237] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0238] 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.

[0239] 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. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. 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). 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.

[0240] 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, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0241] 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.

[0242] 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) and a Serving-Gateway (S-GW)), or a combination thereof.

[0243] 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 specific order presented.

[0244] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0245] 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."

[0246] 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.

[0247] 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.

[0248] 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.

[0249] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0250] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0251] 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."

[0252] 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.

[0253] 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."

[0254] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0255] 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.

[0256] 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 invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a control unit for determining relaxation of mobility measurements based on certain conditions in a terminal in a Radio Resource Control (RRC) idle or inactive state; a transceiver for performing the measurements to which the relaxation is applied; the condition is that the terminal is under the control of a specific base station or cell, and that the terminal receives information about a period during which the measurement is stopped; The specific base station or cell is a terminal whose coverage area is equal to or smaller than a certain size.

2. determining, based on certain conditions, relaxation of mobility measurements for a terminal in a Radio Resource Control (RRC) idle or inactive state; performing the measurement to which the relaxation is applied; the condition is that the terminal is under the control of a specific base station or cell, and that the terminal receives information about a period during which the measurement is stopped; A wireless communication method for a terminal in which the specific base station or cell has a coverage area of ​​a certain size or less.

3. a control unit configured to determine that relaxation of mobility measurements is to be applied under certain conditions for a terminal in a Radio Resource Control (RRC) idle or inactive state; a transmitter that transmits to the terminal a signal used for the measurement to which the relaxation is applied; the condition is that the terminal is under the control of a specific base station or cell, and that information on a period during which the measurement is stopped is transmitted; The specific base station or cell is a base station whose coverage area is equal to or smaller than a certain size.

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