Method and device for measurement reporting in wireless communication system

Abstract

According to the present disclosure, a method performed by a terminal in a wireless communication system may be provided. The method may comprise the steps of: receiving, from a base station, a radio resource control (RRC) release message including configuration information for layer 1 (L1) measurement to be performed in an RRC idle state or an RRC inactive state; performing the L1 measurement on a plurality of carriers on the basis of the configuration information after transitioning to the RRC idle state or the RRC inactive state; transmitting, to the base station, information related to a result of the L1 measurement after transitioning to an RRC connected state; and receiving, from the base station, configuration information of an SCell for carrier aggregation (CA) on the basis of the transmitted information.

Description

Method and apparatus for measurement reporting in a wireless communication system

[0001] The present disclosure relates to a wireless communication system. More specifically, it relates to a method and apparatus for effectively performing measurement reporting in a wireless communication system.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz band (e.g., the 3 terahertz (3 THz) band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), technologies such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as the operation of multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources, initial access techniques to support multi-beam transmission and broadband, definition and operation of Band-Width Parts (BWP), Low Density Parity Check (LDPC) codes for high-volume data transmission, new channel coding methods such as Polar Codes for the reliable transmission of control information, and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

[0004] Currently, discussions are underway to improve and enhance the performance of the initial 5G mobile communication technology, taking into account the services that the 5G mobile communication technology was intended to support. Additionally, standardization of the physical layer is in progress for technologies such as V2X (Vehicle-to-Everything), which helps autonomous vehicles make driving decisions and enhance user convenience based on their own location and status information transmitted by the vehicle; NR-U (New Radio Unlicensed), which aims for system operation in unlicensed bands to comply with various regulatory requirements; NR terminal low power consumption technology (UE Power Saving); Non-Terrestrial Network (NTN), which is direct terminal-satellite communication for securing coverage in areas where communication with the terrestrial network is impossible; and positioning.

[0005] In addition, standardization is underway in the field of wireless interface architecture / protocols for technologies such as the Industrial Internet of Things (IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) which provides nodes to expand network service areas by integrating wireless backhaul links and access links, Mobility Enhancement including Conditional Handover and Dual Active Protocol Stack (DAPS) Handover, and 2-step Random Access (2-step RACH for NR) which simplifies random access procedures. Standardization is also underway in the field of system architecture / services for 5G baseline architectures (e.g., Service based Architecture, Service based Interface) to incorporate Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC), which provides services based on the location of the terminal.

[0006] When such 5G mobile communication systems are commercialized, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] Furthermore, the advancement of these 5G mobile communication systems encompasses multi-antenna transmission technologies such as new waveforms to guarantee coverage in the terahertz band of 6G mobile communication technology, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas; metamaterial-based lenses and antennas to improve terahertz band signal coverage; high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum); and Reconfigurable Intelligent Surface (RIS) technology; as well as Full Duplex technology for enhancing frequency efficiency and system networks in 6G mobile communication technology; AI-based communication technologies that realize system optimization by utilizing satellites and AI from the design stage and internalizing end-to-end AI support functions; and the realization of services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could serve as a foundation for the development of next-generation distributed computing technologies.

[0008] The present disclosure may provide a method and apparatus for effectively performing measurement reporting in a wireless communication system.

[0009] According to one aspect of an embodiment of the present disclosure, a method of operation of a terminal may be characterized by comprising: receiving an RRC release message from a base station containing setting information for a Layer 1 (L1) measurement to be performed in a radio resource control (RRC) idle state or an RRC inactive state; performing the L1 measurement for a plurality of carriers based on the setting information after transitioning to the RRC idle state or the RRC inactive state; transmitting information related to the result of the L1 measurement to the base station after transitioning to an RRC connected state; and receiving setting information for a SCell for Carrier Aggregation (CA) from the base station based on the transmitted information.

[0010] According to one aspect of an embodiment of the present disclosure, a method of operating a base station may be characterized by comprising: a step of transmitting an RRC release message to a terminal that includes setting information for a Layer 1 (L1) measurement to be performed in a radio resource control (RRC) idle state or an RRC inactive state of the terminal; a step of receiving from the terminal, after the terminal has transitioned to an RRC connected state, information related to the result of the L1 measurement performed on a plurality of carriers in the RRC idle state or the RRC inactive state according to the setting information from the terminal; and a step of transmitting setting information for a SCell for Carrier Aggregation (CA) to the terminal based on the received information.

[0011] According to one aspect of an embodiment of the present disclosure, a terminal comprises: at least one transceiver; at least one processor connected to communicate with the at least one transceiver; and one or more memories connected to communicate with the at least one processor and storing instructions that can be executed individually or in any combination by the at least one processor, wherein the instructions may be characterized in that the terminal receives an RRC release message from a base station containing configuration information for a Layer 1 (L1) measurement to be performed in a radio resource control (RRC) idle state or an RRC inactive state, and after transitioning to the RRC idle state or the RRC inactive state, performs the L1 measurement for a plurality of carriers based on the configuration information, and after transitioning to an RRC connected state, transmits information related to the result of the L1 measurement to the base station, and receives configuration information for a SCell for Carrier Aggregation (CA) from the base station based on the transmitted information.

[0012] According to one aspect of an embodiment of the present disclosure, a base station comprises: at least one transceiver; at least one processor connected to communicate with the at least one transceiver; and one or more memories connected to communicate with the at least one processor and storing instructions that can be executed individually or in any combination by the at least one processor, wherein the instructions may be characterized in that the base station transmits an RRC release message to the terminal that includes setting information for a Layer 1 (L1) measurement to be performed in the RRC (radio resource control) idle state or RRC inactive state of the terminal, receives from the terminal information related to the result of the L1 measurement performed on a plurality of carriers in the RRC idle state or RRC inactive state according to the setting information, after the terminal transitions to an RRC connected state, and transmits setting information for a SCell for Carrier Aggregation (CA) to the terminal based on the received information.

[0013] According to the present disclosure, a method performed by a terminal in a wireless communication system may be provided. The method may include the steps of: receiving configuration information for performing a measurement in an idle or inactive state; performing a measurement in the idle or inactive state based on the configuration information; and transmitting information about the measurement result to a base station in a connected state.

[0014] FIG. 1a is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention is applied.

[0015] FIG. 1b is a diagram showing the wireless protocol structure of a next-generation mobile communication system to which the present invention can be applied.

[0016] FIG. 1c is a diagram illustrating the overall operation of measuring surrounding cells in an IDLE state and reporting this to a base station so that a terminal can quickly activate carrier aggregation after an RRC connection in an LTE system or NR system referenced and applied in the present invention.

[0017] FIG. 1d is a diagram illustrating the overall operation of measuring surrounding cells in an INACTIVE state and reporting this to a base station so that the terminal can quickly activate carrier aggregation after the resumption of RRC connection in an LTE system or NR system referenced and applied in the present invention.

[0018] FIG. 1e is a diagram illustrating a first operation in which a terminal performs a Layer 1 measurement in IDLE mode and reports it, as an embodiment 1 proposed in the present invention.

[0019] FIG. 1f is a diagram illustrating a second operation in which a terminal performs a Layer 1 measurement in IDLE mode and reports it, as an embodiment 2 proposed in the present invention.

[0020] FIG. 1g is a diagram illustrating a third operation in which a terminal performs a Layer 1 measurement in IDLE mode and reports it, as an embodiment 3 proposed in the present invention.

[0021] FIG. 1h is a diagram illustrating a first operation in which a terminal performs a Layer 1 measurement in INACTIVE mode and reports it, as 4 of the embodiment proposed in the present invention.

[0022] FIG. 1i is a diagram illustrating a second operation in which a terminal performs a Layer 1 measurement in INACTIVE mode and reports it, as 5 of the embodiment proposed in the present invention.

[0023] FIG. 1j is a diagram illustrating a third operation in which a terminal performs a Layer 1 measurement in INACTIVE mode and reports it, as 6 of the embodiment proposed in the present invention.

[0024] FIG. 1k is a diagram illustrating the operation of a terminal proposed in the present invention performing a Layer 1 measurement in IDLE / INACVTIVE mode and reporting the measurement.

[0025] FIG. 11 is a diagram illustrating the operation of a base station proposed in the present invention to set up and apply Layer 1 measurement in IDLE / INACVTIVE mode.

[0026] FIG. 1m is a block diagram illustrating the internal structure of a terminal to which the present invention is applied.

[0027] FIG. 1n is a block diagram showing the configuration of a base station according to the present invention.

[0028] FIG. 2 is a diagram showing the configuration of a terminal according to one embodiment of the present disclosure.

[0029] FIG. 3 is a diagram showing the configuration of a base station according to one embodiment of the present disclosure.

[0030] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that identical components in the accompanying drawings are represented by the same reference numerals whenever possible. Furthermore, detailed descriptions of known functions and configurations that may obscure the essence of the present disclosure will be omitted.

[0031] In describing the embodiments of this disclosure, technical details that are well known in the technical field to which this disclosure belongs and are not directly related to this disclosure are omitted. This is intended to convey the essence of this disclosure more clearly without obscuring it by omitting unnecessary explanations.

[0032] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the size of each component does not entirely reflect its actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0033] The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below but may be implemented in various different forms. The embodiments provided are merely to make the present disclosure complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0034] At this time, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing instruction means to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0035] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specified logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For instance, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may be executed in reverse order according to their corresponding functions.

[0036] In this embodiment, the term "part" refers to a software or hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or may be configured to run one or more processors. Accordingly, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and "parts" may be combined into a smaller number of components and "parts" or further separated into additional components and "parts." In addition, the components and '~parts' may be implemented to play one or more CPUs within the device or secure multimedia card.

[0037] Hereinafter, a base station is an entity that performs resource allocation for terminals and may be at least one of a Node B, BS (Base Station), eNB (eNode B), gNB (gNode B), a radio access unit, a base station controller, or a node on a network. A terminal may include a UE (User Equipment), MS (Mobile Station), 5G UE, a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. Furthermore, the embodiments of the present disclosure may be applied to other communication systems having a technical background or channel type similar to the embodiments of the present disclosure described below. Additionally, the embodiments of the present disclosure may be applied to other communication systems with some modifications made at the judgment of a person with skilled technical knowledge, provided that they do not deviate significantly from the scope of the present disclosure. For example, 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included therein, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0038] Terms used in the following description to identify connection nodes, terms referring to network entities or network functions (NFs), terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are examples provided for the convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0039] For convenience of explanation below, some terms and names defined in the 3GPP (3rd generation partnership project) LTE (long term evolution) standards and / or 3GPP NR (new radio) standards may be used. However, the present disclosure is not limited by the above terms and names and may be equally applied to systems conforming to other standards.

[0040] FIG. 1a is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention is applied.

[0041] Referring to FIG. 1a, as illustrated, the wireless access network of a next-generation mobile communication system consists of a next-generation base station (New Radio Node B, hereinafter NR NB, 1a-10) and an NR CN (New Radio Core Network, or NG CN: Next Generation Core Network, 1a-05). A user terminal (New Radio User Equipment, hereinafter NR UE or terminal, 1a-15) connects to an external network through the NR NB (1a-10) and the NR CN (1a-05).

[0042] In FIG. 1a, the NR NB (1a-10) corresponds to the eNB (Evolved Node B) of the existing LTE system. The NR NB is connected to the NR UE (1a-15) via a wireless channel and can provide superior service compared to the existing Node B. In next-generation mobile communication systems, since all user traffic is serviced through a shared channel, a device is required to collect status information such as the buffer status, available transmission power status, and channel status of the UEs to perform scheduling, and this is handled by the NR NB (1a-10). A single NR NB typically controls multiple cells. To achieve ultra-high-speed data transmission compared to existing LTE, it can have a maximum bandwidth greater than the existing maximum bandwidth, and beamforming technology can be additionally incorporated by using Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as the wireless access technology. In addition, an Adaptive Modulation & Coding (AMC) method is applied to determine the modulation scheme and channel coding rate according to the channel conditions of the terminal. The NR CN (1a-05) performs functions such as mobility support, bearer configuration, and QoS configuration. The NR CN is a device responsible for various control functions as well as mobility management functions for the terminal, and is connected to multiple base stations. Furthermore, the next-generation mobile communication system can be interoperable with existing LTE systems, and the NR CN is connected to the MME (1a-25) via a network interface. The MME is connected to the existing base station eNB (1a-30).

[0043] FIG. 1b is a diagram showing the wireless protocol structure of a next-generation mobile communication system to which the present invention can be applied.

[0044] Referring to Fig. 1b, the wireless protocol of the next-generation mobile communication system consists of NR SDAP (1b-01, 1b-45), NR PDCP (1b-05, 1b-40), NR RLC (1b-10, 1b-35), and NR MAC (1b-15, 1b-30) at the terminal and the NR base station, respectively.

[0045] The main functions of NR SDAP (1b-01, 1b-45) may include some of the following functions.

[0046] - User data transfer function (transfer of user plane data)

[0047] - Mapping function between a QoS flow and a DRB for both DL and UL for uplink and downlink

[0048] - Marking QoS flow ID for uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0049] - Function to map reflective QoS flow to data bearers for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0050] Regarding the SDAP layer device, the terminal may receive a setting via an RRC message indicating whether to use the header of the SDAP layer device or the functions of the SDAP layer device for each PDCP layer device, bearer, or logical channel. If the SDAP header is configured, the terminal may be instructed to update or reset the mapping information for the QoS flow of the uplink and downlink and the data bearer using the NAS reflective QoS and AS reflective QoS 1-bit indicators of the SDAP header. The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used for data processing priority, scheduling information, etc., to support smooth service.

[0051] The main functions of NR PDCP (1b-05, 1b-40) may include some of the following functions.

[0052] - Header compression and decompression features (ROHC only)

[0053] - User data transfer function (Transfer of user data)

[0054] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0055] - Out-of-sequence delivery of upper layer PDUs

[0056] - Reordering function (PDCP PDU reordering for reception)

[0057] - Duplicate detection function (Duplicate detection of lower layer SDUs)

[0058] - Retransmission of PDCP SDUs

[0059] - Encryption and decryption functions (Ciphering and deciphering)

[0060] - Timer-based SDU discard in uplink.

[0061] In the above, the reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order, or a function of transmitting immediately without considering the order, may include a function of recording lost PDCP PDUs by reordering, may include a function of reporting the status of lost PDCP PDUs to the transmitting side, and may include a function of requesting retransmission of lost PDCP PDUs.

[0062] The main functions of NR RLC(1b-10, 1b-35) may include some of the following functions.

[0063] - Data transfer function (Transfer of upper layer PDUs)

[0064] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0065] - Out-of-sequence delivery of upper layer PDUs

[0066] - ARQ function (Error Correction through ARQ)

[0067] - Concatenation, segmentation, and reassembly functions of RLC SDUs

[0068] - Re-segmentation function (Re-segmentation of RLC data PDUs)

[0069] - Reordering function (Reordering of RLC data PDUs)

[0070] - Duplicate detection

[0071] - Error detection function (Protocol error detection)

[0072] - RLC SDU discard function

[0073] RLC re-establishment function

[0074] In the above, the in-sequence delivery function of the NR RLC device refers to the function of delivering RLC SDUs received from a lower layer to an upper layer in sequence; it may include a function to reassemble and deliver them if a single RLC SDU is received divided into multiple RLC SDUs; it may include a function to rearrange received RLC PDUs based on an RLC SN (sequence number) or PDCP SN (sequence number); it may include a function to record lost RLC PDUs after rearranging the order; it may include a function to report the status of lost RLC PDUs to the transmitting side; it may include a function to request retransmission of lost RLC PDUs; if there are lost RLC SDUs, it may include a function to deliver only the RLC SDUs prior to the lost RLC SDU to the upper layer in sequence; or if a predetermined timer has expired even if there are lost RLC SDUs, it may include a function to deliver all RLC SDUs received before the timer started to the upper layer in sequence; or It may include a function that delivers all RLC SDUs received up to the present to the upper layer in order once a predetermined timer has expired, even if there are lost RLC SDUs. Additionally, the RLC PDUs mentioned above may be processed in the order they are received (regardless of the order of sequence numbers, but in the order of arrival) and delivered to the PDCP device out of order (out-of-sequence delivery). In the case of segments, segments stored in a buffer or to be received later may be received, reconstructed into a single complete RLC PDU, processed, and then delivered to the PDCP device.The above NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with the multiplexing function of the NR MAC layer.

[0075] In the above, the out-of-sequence delivery function of the NR RLC device refers to the function of delivering RLC SDUs received from a lower layer directly to an upper layer regardless of order. It may include a function of reassembling and delivering RLC SDUs when a single RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of the received RLC PDUs and sorting the order to record the lost RLC PDUs.

[0076] The NR MAC (1b-15, 1b-30) can be connected to multiple NR RLC layer devices configured in a terminal, and the main functions of the NR MAC may include some of the following functions.

[0077] - Mapping function (Mapping between logical channels and transport channels)

[0078] - Multiplexing and demultiplexing functions (Multiplexing / demultiplexing of MAC SDUs)

[0079] - Scheduling information reporting function

[0080] - HARQ function (Error correction through HARQ)

[0081] - Priority handling between logical channels of one UE

[0082] - Priority handling between UEs by means of dynamic scheduling

[0083] - MBMS service identification function

[0084] - Transport format selection function

[0085] - Padding

[0086] The NR PHY layer (1b-20, 1b-25) can perform the operation of channel coding and modulating upper layer data, creating OFDM symbols and transmitting them to the wireless channel, or demodulating OFDM symbols received through the wireless channel and channel decoding them to transmit them to the upper layer.

[0087] FIG. 1c is a diagram illustrating the overall operation of measuring surrounding cells in an IDLE state and reporting this to a base station so that a terminal can quickly activate carrier aggregation after an RRC connection in an LTE system or NR system referenced and applied in the present invention.

[0088] Cell re-selection is a procedure for determining which cell a terminal will camp in when the service quality with the serving cell becomes lower than the service quality with surrounding cells due to the movement of a terminal in an IDLE state (referred to as idle state or sleep mode, etc., in this invention). While the decision for handover is determined by the network (MME / AMF or source eNB / gNB), cell re-selection is determined by the terminal based on measured values. Furthermore, the cell that the terminal re-selects while moving may be a cell using the same frequency (intra-frequency) as the currently camped serving cell, a cell using a different frequency (inter-frequency), or a cell using a different radio access technology (inter-RAT).

[0089] A terminal (1c-01) in an RRC connection state is connected to serving cell 1 (1c-02) and, upon receiving an RRCRelease message from the cell in step 1c-05, can transition to an RRC IDLE state. In the above step, the RRCRelease message transmits to the terminal measurement information (IDLE measurement setting information; measurement frequency / carrier and cell list, area where measurement can be performed (frequency list), measurement execution time, type of reference signal to be measured and threshold value, etc.) that the terminal must measure in the RRC IDLE state according to the measIdleConfig setting. In the above, the valid cell list (validity area) where surrounding cells can be measured refers to a list of cells where IDLE mode measurement can be performed in the cell the terminal has camped on, and it can be interpreted as indicating that the terminal can process IDLE mode measurement in those cells. Upon receiving the RRC Release message, the terminal can perform IDLE measurement according to the above setting in step 1c-10. If the above setting does not exist but the system information (SIB11) of the cell where the terminal camped in step 1c-15 provides an IDLE measurement setting, the terminal may perform IDLE measurement by applying the setting of that system information. For reference, the case where the terminal performs IDLE measurement by applying the system information setting corresponds to when SIB1 broadcasts whether the cell supports SIB11 and the cell instructs the broadcast of the SIB11 function (IDLE measurement). Table 1 below shows an example of an IDLE measurement setting.In addition, if the terminal receives an IDLE measurement setting in the RRCRelease message of the previous serving cell, the terminal may apply the IDLE measurement setting provided in the RRCRelease message of the previous serving cell without applying the SIB11 setting of the camped cell.

[0090]

[0091] As can be seen by referring to Table 1 above, the setting to measure surrounding cells in the IDLE state can be configured via SIB4 / SIB11 or RRC release messages. The difference between the setting via SIB4 / SIB11 and the setting via RRC release messages is that SIB4 / SIB11 provides only the inter-carrier frequency information (list) required for measurement, whereas the RRC release message sets both the inter-carrier frequency information (list) required for measurement and the timer period (measIdleDuration-r16) that instructs how long the measurement should be performed in IDLE mode. In other words, the RRC release message can be used to instruct the terminal to perform IDLE mode measurements exclusively and to trigger the corresponding operation, or the setting can be provided via SIB4 / SIB11 to apply the same setting to the serving cells universally. In this case, the base station may omit the setting for the inter-carrier frequency information to be measured in the IDLE state from the RRC release message. If the SIB4 / SIB11 and RRC release messages contain duplicate inter-carrier frequency information to be measured in the IDLE state, the information contained in the RRC release message takes precedence.

[0092] A terminal that receives an RRC release message containing information instructing a measurement of surrounding cells in the IDLE state may, in step 1c-10, start a measurement of the frequency and cells set in the IDLE state and operate an IDLE state cell measurement timer (T331). The terminal may perform the IDLE state cell measurement until the timer (T331) is operated and the timer expires (measIdleDuration-r16), but in NR, it checks the validity of the cell that is re-selected and if the cell supports IDLE mode measurement (which can be determined after checking SIB1 and SIB11, 1c-15), it may start a measurement of the surrounding cells instructed by the cell or in the RRC release (1c-10). That is, the terminal can check whether the serving cell can receive the IDLE mode measurement value and process it with fast carrier aggregation (CA). The above capability may be indicated by the idleModeMeasurements field in SIB1, and the terminal may determine whether to perform measurements in IDLE mode based on whether SIB1 indicates idleModeMeasurements in the above step. When the corresponding timer expires, the terminal may continue to perform the measurement set in SIB11 or stop the measurement at the terminal's discretion.

[0093] If the terminal transitions to an RRC connected state while the timer (T331) is operating, that is, before the timer expires (performing a random access procedure to the serving cell in steps 1c-20 to 1c-35 and transitioning to an RRC connected state in step 1c-40), the terminal stops the T331 timer. If it is determined that the serving cell to which the terminal transitioned to the connected state can receive the IDLE mode measurement value and process it with fast CA, the terminal may send an RRC setup complete message (RRCSetupComplete) to the corresponding serving cell in step 1c-45, which includes an indicator that the terminal is storing the measurement values ​​of surrounding cells measured in the IDLE state. Table 2 below shows an example of the configuration of the RRC setup complete message.

[0094]

[0095] Upon receiving the above RRC setup complete message, the serving cell can recognize that there are measurement values ​​from surrounding cells measured by the terminal in the IDLE state, and in step 1c-50, it can send a UE information request message (UEInformationRequest) to the terminal requesting the corresponding measurement value information. Table 3 below shows an example of the configuration of the UE information request message.

[0096]

[0097] Upon receiving the above UE information request message, the terminal may report the channel measurements by transmitting a UE information response message (UEInformationResponse) to the serving cell, which includes the channel measurements of the serving cell and surrounding cells stored by the terminal in step 1c-55. Tables 4 and 5 below show examples of the settings for the UE information response message.

[0098]

[0099]

[0100] As can be seen from Tables 4 and 5 above, the UE information response message includes the channel measurements of the serving cell (RSRP (reference signals received power), RSRQ (reference signal received quality)) and the measurements of surrounding cells that were instructed to be measured; specifically, it includes the frequency information of the surrounding cells, the PCI ID (physical cell identifier), and the channel measurements (RSRP, RSRQ) of the corresponding cell. Additionally, although omitted in the description above, configuration and request / response for reselection measurements can be performed in the same manner for the corresponding IDLE measurement operation. Here, reselection measurement refers to information measured by the terminal for cell reselection operations while in the IDLE state. Furthermore, to verify how up-to-date the IDLE / reselection measurements reported by the terminal are, the serving cell sets a Validity time, and the terminal can report only valid measurements according to this setting.

[0101] - Validity time: measurements duration before msg1 transmission

[0102] In the above steps, the base station that receives measurement values ​​for surrounding cells in the IDLE state from the terminal may provide SCell configuration information for CA to the terminal in step 1c-60. The base station may refer to the information reported by the terminal in that step, and in subsequent steps, may enable CA by transmitting an activation MAC CE for SCell due to reasons such as an increase in the terminal's data transmission volume. For example, the base station may transmit an RRC reconfiguration message containing SCell configuration information for CA in step 1c-60, and in 1c-65, the base station may transmit a MAC CE to the terminal for enabling or disabling SCell.

[0103] FIG. 1d is a diagram illustrating the overall operation of measuring surrounding cells in an INACTIVE state and reporting this to a base station so that the terminal can quickly activate carrier aggregation after the resumption of RRC connection in an LTE system or NR system referenced and applied in the present invention.

[0104] A terminal (1d-01) in an RRC connection state is connected to serving cell 1 (1d-02) and, in step 1d-05, receives an RRCRelease message containing suspendConfig from the cell and can transition to an RRC INACTIVE state. In the above step, the RRCRelease message can transmit measurement information to the terminal that the terminal must measure in the RRC INACTIVE state in the measIdleConfig setting (IDLE / INACTIVE measurement setting information; measurement frequency / carrier and cell list, area where measurement can be performed (frequency list), measurement execution time, type of reference signal to be measured and threshold value, etc.). In the above, the valid cell list (validity area) that can measure surrounding cells refers to a list of cells that can perform IDLE / INACTIVE mode measurement in the cell on which the terminal camped, and can be interpreted as indicating that the terminal can process IDLE / INACTIVE mode measurement in those cells. A terminal that receives an RRC release message may perform IDLE / INACTIVE measurement according to the above settings in step 1d-10. If the above settings do not exist but the system information (SIB11) of the cell camped by the terminal in step 1d-15 provides IDLE / INACTIVE measurement settings, the terminal may perform IDLE / INACTIVE measurement by applying the settings of the corresponding system information. For reference, the case in which the terminal performs IDLE / INACTIVE measurement by applying the settings of the system information corresponds to the case where SIB1 broadcasts whether the cell supports SIB11 and the cell instructs the broadcasting of the SIB11 function (IDLE / INACTIVE measurement). Table 6 below shows an example of IDLE / INACTIVE measurement settings.In addition, if the terminal receives an IDLE / INACTIVE measurement setting in the RRCRelease message of the previous serving cell, the terminal may apply the IDLE / INACTIVE measurement setting provided in the RRCRelease message of the previous serving cell without applying the SIB11 setting of the camped cell.

[0105]

[0106] As can be seen by referring to Table 6 above, the setting to measure surrounding cells in the INACTIVE state can be configured via SIB11 or RRC release messages. The difference between configuration via SIB11 and RRC release messages is that SIB11 provides only the inter-carrier frequency information (list) required for measurement, whereas RRC release messages provide both the inter-carrier frequency information (list) required for measurement and the timer period (measIdleDuration-r16) that instructs how long measurements should be taken in INACTIVE mode. In other words, RRC release messages can be used to instruct the terminal to perform dedicated measurements in IDLE / INACTIVE mode and to trigger such operations; conversely, to apply the same settings to the serving cells universally, the same settings can be provided via SIB4 / SIB11. In this case, the base station may omit the configuration regarding the inter-carrier frequency information to be measured in the INACTIVE state from the RRC release message. If the SIB4 / SIB11 and RRC release messages contain duplicate inter-carrier frequency information to be measured in the INACTIVE state, the information contained in the RRC release message takes precedence.

[0107] A terminal that receives an RRC release message containing information instructing a measurement of surrounding cells in the INACTIVE state may start measurements for the frequencies and cells set in the INACTIVE state in step 1d-10 and may operate the INACTIVE state cell measurement timer (T331). The terminal may perform IDLE / INACTIVE state cell measurements until the timer (T331) is operated and the timer expires (measIdleDuration-r16), but in NR, it checks the validity of the cell that is re-selected and if the cell supports IDLE / INACTIVE mode measurements (which can be determined after checking SIB1 and SIB11, 1d-15), it may start measurements for surrounding cells instructed by the cell or in the RRC release (1d-10). That is, the terminal can check whether the serving cell can receive the IDLE / INACTIVE mode measurement value and process it with fast carrier aggregation (CA). The above capability may be indicated by the idleModeMeasurements field in SIB1, and the terminal may determine whether to perform a measurement in INACTIVE mode based on whether the idleModeMeasurements field in SIB1 is indicated in the above step. When the corresponding timer expires, the terminal may continue to perform the measurement set in SIB11 or stop the measurement at the terminal's discretion.

[0108] If the terminal transitions to an RRC connected state through the RRC connection resumption procedure while the timer (T331) is operating, that is, before the timer expires (performing a random access procedure to the serving cell in steps 1d-20 to 1d-35 and transitioning to an RRC connected state in step 1d-40), the terminal stops the T331 timer. If the terminal receives a request (idleModeMeasurementReq) via the RRCResume message to report INACTIVE mode measurements from the serving cell to which it transitioned to the connected state, the terminal may report to the corresponding serving cell in step 1d-45, including measurements of surrounding cells measured by the terminal in the INACTIVE state. The information reported to the serving cell may be transmitted to the serving cell via the RRC resume complete message (RRCResumeComplete). Table 7 below shows an example of the configuration of the RRC resume message, and Tables 8 and 9 below show examples of the configuration of the RRC resume complete message.

[0109]

[0110]

[0111]

[0112] As can be seen from Tables 8 and 9 above, the RRC resume complete message includes the channel measurements (RSRP, RSRQ) of the serving cell and the measurements of surrounding cells that were instructed to measure; specifically, it includes the frequency information, PCI ID, and the channel measurements (RSRP, RSRQ) of the surrounding cells. Additionally, although omitted in the description above, it is possible to configure and request / response for reselection measurements in the same manner for the corresponding IDLE / INACTIVE measurement operation. Here, reselection measurement refers to information measured by the terminal for cell reselection operations in the IDLE / INACTIVE state. Furthermore, to verify how up-to-date the IDLE / reselection measurements reported by the terminal are, the serving cell sets a Validity time, and the terminal can report only valid measurements according to this setting.

[0113] - Validity time: measurements duration before msg1 transmission

[0114] In the above steps, a base station that receives measurement values ​​for surrounding cells in the INACTIVE state from a terminal may provide SCell configuration information for CA to the terminal in steps 1d-50. The base station may refer to the information reported by the terminal in that step, and in subsequent steps, may enable CA by transmitting an activation MAC CE for SCell due to reasons such as an increase in the terminal's data transmission volume. For example, in steps 1c-50, the base station may transmit an RRC reconfiguration message containing SCell configuration information for CA, and in 1c-55, the base station may transmit a MAC CE to the terminal for enabling or disabling SCell.

[0115] FIG. 1e is a diagram illustrating a first operation in which a terminal performs a Layer 1 measurement in IDLE mode and reports it as an embodiment 1 proposed in the present invention. In particular, due to the method of L1 measurement in IDLE state and rapid reporting in connection state according to the present invention, the terminal can achieve data quality improvement by, in addition to receiving CA instructions quickly, changing to an optimal beam and applying optimization of MCS settings quickly.

[0116] A terminal (1e-01) in an RRC connection state may be connected to serving cell 1 (1e-02) and, in step 1e-05, receive an RRCRelease message from the cell and transition to an RRC IDLE state. In the above step, the RRCRelease message may transmit to the terminal Layer 1 measurement information (Layer 1 IDLE measurement setting information; measurement frequency / carrier and cell / BWP, L1 resource settings requiring measurement (SSB resource settings, CSI-RS resource settings) and thresholds, an area where measurement can be performed (frequency / cell list), measurement execution time, etc.) that the terminal must measure in the RRC IDLE state. In the above, the valid cell list (validity area) that can measure surrounding cells refers to a list of cells that can perform IDLE Layer 1 measurements in the cell on which the terminal has camped, and can be interpreted as indicating that the terminal can process IDLE mode measurements in those cells. In addition, the above-mentioned measurement execution time setting may be defined as one or more of the following timers, which indicate the time at which the actual measurement is performed after the terminal is instructed to perform the setting or Layer 1 resource measurement.

[0117] - 1st Timer: Validity timer for when the terminal must perform L1 resource measurement after receiving L1 resource measurement-related settings in the RRCRelease message

[0118] - 2nd Timer: A validity timer that operates after receiving L1 resource measurement settings in the RRCRelease message and after receiving an explicit instruction for L1 resource measurement from the base station (explicit L1 resource measurement instructions are explained in detail below).

[0119] In addition, in the present invention, the method of providing L1 resource configuration information that the terminal must measure in the IDLE state in the RRCRelease message at step 1e-05 may be one of the following specific methods.

[0120] - Method for configuring Layer 1 resource measurement: A method to measure Layer 1 measurement resource settings configured in an RRC connection state (e.g., Layer 1 resource measurement settings for L1 / L2 triggered mobility (LTM)) exactly as they are in IDLE state (no separate indicators or settings).

[0121] - Method for configuring Layer 2 L1 resource measurements: Measurement instruction using an indicator that specifies whether to use the Layer 1 measurement resource settings configured in the RRC connection state in the RRCR release message even in the IDLE state.

[0122] - 3rd L1 Resource Measurement Configuration Method: Provide the L1 resource configuration information that the terminal needs to measure in the IDLE state as new configuration information in the RRCRelease message.

[0123] - 4th L1 Resource Measurement Configuration Method: In addition to the RRCRelease message, the L1 resource configuration information that the terminal needs to measure in the IDLE state is provided as new configuration information in the System information.

[0124] The above L1 resource configuration information can be configured in one of the following forms.

[0125] - Option 1: Explicitly provide the L1 resource information to be measured, similar to the L1 resource measurement settings in the existing LTM (LTM-CSI-ResourceConfig in LTM-Config-r18)

[0126] - Option 2: Frequency / cell information to be measured is provided like existing IDLE measurement information, and the terminal measures SSB accordingly (MeasIdleConfig)

[0127] A terminal that has received L1 measurement resource settings via the above method performs Layer 1 IDLE measurement according to the settings in step 1e-10, and if a related measurement timer setting exists, it may operate the timer according to the settings (1e-15). If there are no settings via RRCRelease but the system information of the cell the terminal is camping in step 1e-20 provides Layer 1 IDLE measurement settings, the terminal may perform Layer 1 IDLE measurement by applying the settings of the system information. For reference, the case in which the terminal performs Layer 1 IDLE measurement by applying the settings of the system information corresponds to the case where SIB1 broadcasts whether the cell supports Layer 1 IDLE measurement and the cell instructs the broadcast of a specific SIBXX function (Layer 1 IDLE measurement). Additionally, if the terminal receives Layer 1 IDLE measurement settings via the RRCRelease message of the previous serving cell, the terminal may apply the Layer 1 IDLE measurement settings provided in the RRCRelease message of the previous serving cell without applying the SIBXX settings of the camped cell.

[0128] A terminal that receives an RRC release message containing information instructing a Layer 1 IDLE measurement of a neighboring cell in an IDLE state may start a measurement for the frequency and cells set in the IDLE state in step 1e-10 and may operate an IDLE state cell measurement timer. Here, the timer may be the first timer or the second timer described above. When the timer expires, the terminal may stop the related Layer 1 IDLE measurement.

[0129] If the terminal transitions to an RRC connected state while the timer is operating, that is, before the timer expires (performing a random access procedure to the serving cell in steps 1e-25 to 1e-40 and transitioning to an RRC connected state in step 1e-45), the terminal stops the timer, and if it is determined that the serving cell to which the terminal transitioned to the connected state can receive Layer 1 IDLE mode measurements and process them with fast CA, the terminal may send an RRC setup complete message (RRCSetupComplete) to the serving cell in step 1e-50, which includes an indicator that the terminal is storing measurements of surrounding cells measured in the IDLE state. Alternatively, after sending the RRCSetupComplete message, the terminal may report to the serving cell that there is Layer 1 resource information measured through a specific MAC CE.

[0130] The serving cell that receives the above message can know that there are measurement values ​​of surrounding cells that the terminal measured in the IDLE state, and in step 1e-55, it can transmit an RRC message (e.g., UEInformationRequest) or MAC CE / DCI requesting the terminal of the measurement value information.

[0131] Upon receiving the above message, the terminal may report the measurement results, including the channel measurements of the serving cell and surrounding cells stored by the terminal in step 1e-60, to the serving cell. For this report, a new RRC message or MAC CE and UCI (PUSCH / PUCCH) may be used. Additionally, if an explicit request is made in step 1e-55, the report may be reported using a different signaling method depending on the measured Layer 1 resource configuration method. For example, event-based L1 reports may be in the form of MAC CE, while reports for which the base station explicitly requested may be reported via UCI. Alternatively, all may be reported as RRC messages.

[0132] In particular, L1 resource reporting may be performed for SSB and CSI-RS resources, and includes channel measurements (RSRP, RSRQ) of the serving cell and measurements of surrounding cells that were instructed to measure, as well as one or more cell and beam measurements (RSRP, RSRQ). Additionally, to verify how up-to-date the Layer 1 IDLE measurements reported by the terminal are, the serving cell sets a Validity time, and the terminal may report only valid measurements according to the setting.

[0133] - Validity time: measurements duration before msg1 transmission

[0134] In the above step, the base station that receives measurement values ​​for surrounding cells in the IDLE state from the terminal may provide SCell configuration information for CA to the terminal via an RRC reconfiguration message in step 1e-65, or enable CA via a SCell activation MAC CE. In this signaling, not only configuration and activation information for SCell may be provided, but also instructions to the optimal beam (TCI state instruction) and changes to the settings to the optimal MCS value may be given. Through this, the terminal can achieve fast CA and data performance optimization. For example, the following scenario may be applied.

[0135] - Scenario 1: SCell configuration information is provided in advance by the base station via RRCR-lease settings, and SCell activation is determined via MAC CE based on the terminal's L1 report after connecting to the serving cell. At this time, the optimal TCI state and MCS instructions are also provided (or relevant information is provided in the additional RRC information).

[0136] - Scenario 2: After the base station connects to the serving cell, it provides the addition and activation of the cell via RRC settings, TCI state instructions, and updates to MCS value settings based on the terminal's L1 report.

[0137] FIG. 1f is a diagram illustrating a second operation in which a terminal performs a Layer 1 measurement in IDLE mode and reports it, as an embodiment 2 proposed in the present invention. In particular, the difference between this embodiment and the above embodiment 1 is that the method by which the base station instructs the terminal to perform a Layer 1 IDLE measurement is based on a paging signal rather than an RRCRelease message, and other procedures are the same as those in FIG. 1e.

[0138] A terminal (1f-01) in an RRC connection state can be connected to serving cell 1 (1f-02) and then receive an RRCRelease message from the cell in step 1f-05 and transition to an RRC IDLE state. In the above step, the RRCRelease message can transmit to the terminal Layer 1 measurement information (Layer 1 IDLE measurement setting information; measurement frequency / carrier and cell / BWP, L1 resource settings requiring measurement (SSB resource settings, CSI-RS resource settings) and thresholds, area where measurement can be performed (frequency / cell list), measurement execution time, etc.) that the terminal must measure in the RRC IDLE state. In the above, the valid cell list (validity area) that can measure surrounding cells refers to a list of cells that can perform IDLE Layer 1 measurements in the cell on which the terminal has camped, and can be interpreted as indicating that the terminal can process IDLE mode measurements in those cells. In addition, the above-mentioned measurement execution time setting may be defined as one or more of the following timers, which indicate the time at which the actual measurement is performed after the terminal is instructed to perform the setting or Layer 1 resource measurement.

[0139] - 1st Timer: Validity timer for when the terminal must perform L1 resource measurement after receiving L1 resource measurement-related settings in the RRCRelease message

[0140] - 2nd Timer: A validity timer that operates after receiving L1 resource measurement settings in the RRCRelease message and after receiving an explicit instruction for L1 resource measurement from the base station (explicit L1 resource measurement instructions are explained in detail below).

[0141] In addition, in the present invention, the method of providing L1 resource configuration information that the terminal must measure in the IDLE state in the RRCRelease message at step 1f-05 may be one of the following specific methods.

[0142] - Method for configuring Layer 1 resource measurement: A method to measure Layer 1 measurement resource settings configured in an RRC connection state (e.g., Layer 1 resource measurement settings for L1 / L2 triggered mobility (LTM)) exactly as they are in IDLE state (no separate indicators or settings).

[0143] - Method for configuring Layer 2 L1 resource measurements: Measurement instruction using an indicator that specifies whether to use the Layer 1 measurement resource settings configured in the RRC connection state in the RRCR release message even in the IDLE state.

[0144] - 3rd L1 Resource Measurement Configuration Method: Provide the L1 resource configuration information that the terminal needs to measure in the IDLE state as new configuration information in the RRCRelease message.

[0145] - 4th L1 Resource Measurement Configuration Method: In addition to the RRCRElease message, provide the L1 resource configuration information that the terminal needs to measure in the IDLE state from the System information as new configuration information.

[0146] The above L1 resource configuration information can be configured in one of the following forms.

[0147] - Option 1: Explicitly provide the L1 resource information to be measured, similar to the L1 resource measurement settings in the existing LTM (LTM-CSI-ResourceConfig in LTM-Config-r18)

[0148] - Option 2: Frequency / cell information to be measured is provided like existing IDLE measurement information, and the terminal measures SSB accordingly (MeasIdleConfig)

[0149] If there is no setting via RRCRelease but the system information of the cell the terminal is camping in step 1f-10 provides a Layer 1 IDLE measurement setting, the terminal can perform Layer 1 IDLE measurement by applying the setting of said system information. For reference, the case where the terminal performs Layer 1 IDLE measurement by applying the setting of the system information corresponds to the case where SIB1 broadcasts whether the cell supports Layer 1 IDLE measurement and the cell instructs the broadcast of a specific SIBXX function (Layer 1 IDLE measurement). Additionally, if the terminal receives a Layer 1 IDLE measurement setting via the RRCRelease message of the previous serving cell, the terminal can apply the Layer 1 IDLE measurement setting provided in the RRCRelease message of the previous serving cell without applying the SIBXX setting of the camped cell.

[0150] A terminal that receives an RRC release message containing Layer 1 IDLE measurement settings for a surrounding cell receives a paging signal in the IDLE state from the base station where the terminal is camp-on in step 1f-15, and the paging message may include instructions for the terminal to start Layer 1 IDLE measurement. In step 1f-20, upon receiving the paging signal, the terminal may start measurements for the frequencies and cells set in the IDLE state and activate an IDLE state cell measurement timer (1f-25). Here, the timer may be the first timer or the second timer described above. When the timer expires, the terminal may stop the related Layer 1 IDLE measurement.

[0151] If the terminal transitions to an RRC connected state while the timer is operating, that is, before the timer expires (performing a random access procedure to the serving cell in steps 1f-30 to 1f-45 and transitioning to an RRC connected state in step 1f-50), the terminal stops the timer, and if it is determined that the serving cell to which the terminal transitioned to the connected state can receive Layer 1 IDLE mode measurements and process them with fast CA, the terminal may send an RRC setup complete message (RRCSetupComplete) to the serving cell in step 1f-55, which includes an indicator that the terminal is storing measurements of surrounding cells measured in the IDLE state. Alternatively, after sending the RRCSetupComplete message, the terminal may report to the serving cell that there is Layer 1 resource information measured through a specific MAC CE.

[0152] The serving cell that receives the above message can know that there are measurement values ​​of surrounding cells that the terminal measured in the IDLE state, and in step 1f-60, it can transmit an RRC message (e.g., UEInformationRequest) or MAC CE / DCI requesting the measurement value information to the terminal.

[0153] Upon receiving the above message, the terminal may report the measurement results, including channel measurements of the serving cell and surrounding cells stored by the terminal in step 1f-65, to the serving cell. For this report, a new RRC message or MAC CE and UCI (PUSCH / PUCCH) may be used. Additionally, if an explicit request is made in step 1f-60, the report may be reported using a different signaling method depending on the measured Layer 1 resource configuration method. For example, event-based L1 reports may be in the form of MAC CE, while reports for which the base station explicitly requested may be reported via UCI. Alternatively, all may be reported as RRC messages.

[0154] In particular, L1 resource reporting may be performed for SSB and CSI-RS resources, and includes channel measurements (RSRP, RSRQ) of the serving cell and measurements of surrounding cells that were instructed to measure, as well as one or more cell and beam measurements (RSRP, RSRQ). Additionally, to verify how up-to-date the Layer 1 IDLE measurements reported by the terminal are, the serving cell sets a Validity time, and the terminal may report only valid measurements according to the setting.

[0155] - Validity time: measurements duration before msg1 transmission

[0156] In the above step, the base station that receives measurement values ​​for surrounding cells in the IDLE state from the terminal may provide SCell configuration information for CA to the terminal via an RRC reconfiguration message in step 1f-70, or enable CA via a SCell activation MAC CE. In this signaling, not only configuration and activation information for SCell may be provided, but also instructions to the optimal beam (TCI state instruction) and changes to the settings to the optimal MCS value may be given. Through this, the terminal can achieve fast CA and data performance optimization. For example, the following scenario may be applied.

[0157] - Scenario 1: SCell configuration information is provided in advance by the base station via RRCR-lease settings, and SCell activation is determined via MAC CE based on the terminal's L1 report after connecting to the serving cell. At this time, the optimal TCI state and MCS instructions are also provided (or relevant information is provided in the additional RRC information).

[0158] - Scenario 2: After the base station connects to the serving cell, it provides the addition and activation of the cell via RRC settings, TCI state instructions, and updates to MCS value settings based on the terminal's L1 report.

[0159] FIG. 1g is a diagram illustrating a third operation in which a terminal performs a Layer 1 measurement in IDLE mode and reports it, as part of Embodiment 3 proposed in the present invention. In particular, the difference between this embodiment and Embodiments 1 and 2 is that the method by which the base station instructs the terminal to perform a Layer 1 IDLE measurement is based on a signal following the RRC connection state, rather than an RRCR release message or a paging message, and other procedures are the same as those in FIG. 1e and 1f.

[0160] A terminal (1g-01) in an RRC connection state can be connected to serving cell 1 (1g-02) and, in step 1g-05, receive an RRCRelease message from the cell and transition to an RRC IDLE state. In the above step, the RRCRelease message can transmit to the terminal Layer 1 measurement information (Layer 1 IDLE measurement setting information; measurement frequency / carrier and cell / BWP, L1 resource settings requiring measurement (SSB resource settings, CSI-RS resource settings) and thresholds, the area where measurement can be performed (frequency / cell list), measurement execution time, etc.) that the terminal must measure in the RRC IDLE state. In the above, the valid cell list (validity area) that can measure surrounding cells refers to a list of cells that can perform IDLE Layer 1 measurements in the cell on which the terminal has camped, and can be interpreted as indicating that the terminal can process IDLE mode measurements in those cells. In addition, the above-mentioned measurement execution time setting may be defined as one or more of the following timers, which indicate the time at which the actual measurement is performed after the terminal is instructed to perform the setting or Layer 1 resource measurement.

[0161] - 1st Timer: Validity timer for when the terminal must perform L1 resource measurement after receiving L1 resource measurement-related settings in the RRCRelease message

[0162] - 2nd Timer: A validity timer that operates after receiving L1 resource measurement settings in the RRCRelease message and after receiving an explicit instruction for L1 resource measurement from the base station (explicit L1 resource measurement instructions are explained in detail below).

[0163] In addition, in the present invention, the method of providing L1 resource configuration information that the terminal must measure in the IDLE state in the RRCRelease message at step 1g-05 may be one of the following specific methods.

[0164] - Method for configuring Layer 1 resource measurement: A method to measure Layer 1 measurement resource settings configured in an RRC connection state (e.g., Layer 1 resource measurement settings for L1 / L2 triggered mobility (LTM)) exactly as they are in IDLE state (no separate indicators or settings).

[0165] - Method for configuring Layer 2 L1 resource measurements: Measurement instruction using an indicator that specifies whether to use the Layer 1 measurement resource settings configured in the RRC connection state in the RRCR release message even in the IDLE state.

[0166] - 3rd L1 Resource Measurement Configuration Method: Provide the L1 resource configuration information that the terminal needs to measure in the IDLE state as new configuration information in the RRCRelease message.

[0167] - 4th L1 Resource Measurement Configuration Method: In addition to the RRCRElease message, provide the L1 resource configuration information that the terminal needs to measure in the IDLE state from the System information as new configuration information.

[0168] The above L1 resource configuration information can be configured in one of the following forms.

[0169] - Option 1: Explicitly provide the L1 resource information to be measured, similar to the L1 resource measurement settings in the existing LTM (LTM-CSI-ResourceConfig in LTM-Config-r18)

[0170] - Option 2: Frequency / cell information to be measured is provided like existing IDLE measurement information, and the terminal measures SSB accordingly (MeasIdleConfig)

[0171] If there is no setting via RRCRelease but the system information of the cell the terminal is camping in during the 1g-10 phase provides a Layer 1 IDLE measurement setting, the terminal can perform Layer 1 IDLE measurement by applying the setting of said system information. For reference, the case where the terminal performs Layer 1 IDLE measurement by applying the setting of the system information corresponds to the case where SIB1 broadcasts whether the cell supports Layer 1 IDLE measurement and the cell instructs the broadcast of a specific SIBXX function (Layer 1 IDLE measurement). Additionally, if the terminal receives a Layer 1 IDLE measurement setting via the RRCRelease message of the previous serving cell, the terminal can apply the Layer 1 IDLE measurement setting provided in the RRCRelease message of the previous serving cell without applying the SIBXX setting of the camped cell.

[0172] When a terminal receives an RRC release message containing a Layer 1 IDLE measurement setting for a neighboring cell and transitions to an RRC connected state (performing a random access procedure to the serving cell in steps 1g-15 to 1g-30 and transitioning to an RRC connected state), the terminal can perform a Layer 1 IDLE measurement of the neighboring cell by receiving a setting instructing the Layer 1 IDLE mode measurement value from the serving cell that has transitioned to the connected state via an RRCSetup message. In step 1g-35, when the terminal receives a signal containing the above instruction, it can start measurements for the frequencies and cells set to be measured in the IDLE state and activate the IDLE state Layer 1 cell measurement timer. Here, the timer may be the first timer or the second timer described above. When the said timer expires, the terminal may stop the related Layer 1 IDLE measurement.

[0173] In step 1g-40, the terminal may send an RRC setup complete message (RRCSetupComplete) to the corresponding serving cell, which includes an indicator (or an indicator that there is a relevant capability) that the terminal has stored the measurements of surrounding cells measured by the terminal in the IDLE state. Alternatively, after sending the RRCSetupComplete message, the terminal may report that it has Layer 1 resource information measured through a specific MAC CE.

[0174] Alternatively, the L1 resource measurement instruction in step 1g-30 may be given via DCI or MAC CE in step 1g-45 instead of an RRCSetup message. In this case, the terminal may start measurements for frequencies and cells set to be measured in the IDLE state after the instruction via DCI or MAC CE, and may activate the IDLE state Layer 1 cell measurement timer. Here, the timer may be the first timer or the second timer described above. When the timer expires, the terminal may stop the related Layer 1 IDLE measurement.

[0175] A serving cell that receives an indicator from a terminal that there is Layer 1 cell measurement information can know that there are measurement values ​​of surrounding cells measured by the terminal in the IDLE state, and can transmit an RRC message (e.g., UEInformationRequest) or MAC CE / DCI requesting the measurement value information to the terminal in step 1g-50.

[0176] Upon receiving the above message, the terminal may report the measurement results, including channel measurements of the serving cell and surrounding cells stored by the terminal in step 1g-55, to the serving cell. For the above report, a new RRC message or MAC CE and UCI (PUSCH / PUCCH) may be used. Additionally, if an explicit request is made in step 1g-50, the report may be reported using a different signaling method depending on the measured Layer 1 resource configuration method. For example, event-based L1 reports may be in the form of MAC CE, while reports made via an explicit request by the base station may be reported via UCI. Alternatively, all may be reported as RRC messages.

[0177] In particular, L1 resource reporting may be performed for SSB and CSI-RS resources, and includes channel measurements (RSRP, RSRQ) of the serving cell and measurements of surrounding cells that were instructed to measure, as well as one or more cell and beam measurements (RSRP, RSRQ). Additionally, to verify how up-to-date the Layer 1 IDLE measurements reported by the terminal are, the serving cell sets a Validity time, and the terminal may report only valid measurements according to the setting.

[0178] - Validity time: measurements duration before msg1 transmission

[0179] In the above step, the base station that receives measurement values ​​regarding surrounding cells in the IDLE state from the terminal may provide SCell configuration information for CA to the terminal via an RRC reconfiguration message in the 1g-60 step, or enable CA via a SCell activation MAC CE. In this signaling, not only configuration and activation information for SCell may be provided, but also instructions to the optimal beam (TCI state instruction) and changes to the settings to the optimal MCS value may be given. Through this, the terminal can achieve fast CA and data performance optimization. For example, the following scenario may be applied.

[0180] - Scenario 1: SCell configuration information is provided in advance by the base station via RRCR-lease settings, and SCell activation is determined via MAC CE based on the terminal's L1 report after connecting to the serving cell. At this time, the optimal TCI state and MCS instructions are also provided (or relevant information is provided in the additional RRC information).

[0181] - Scenario 2: After the base station connects to the serving cell, it provides the addition and activation of the cell via RRC settings, TCI state instructions, and updates to MCS value settings based on the terminal's L1 report.

[0182] FIG. 1h is a diagram illustrating a first operation in which a terminal performs a Layer 1 measurement in INACTIVE mode and reports it, as 4 of the embodiment proposed in the present invention. In particular, due to the method of L1 measurement in the INACTIVE state and rapid reporting in the connection state of the present invention, the terminal can achieve data quality improvement by, in addition to receiving CA instructions quickly, quickly applying changes to the optimal beam and optimization of MCS settings.

[0183] A terminal (1h-01) in an RRC connection state is connected to serving cell 1 (1h-02) and, in step 1h-05, receives an RRCRelease message including suspendConfig from the cell and can transition to an RRC INACTIVE state. In the above step, the RRCRelease message can transmit to the terminal Layer 1 measurement information (Layer 1 INACTIVE measurement setting information; measurement frequency / carrier and cell / BWP, L1 resource settings requiring measurement (SSB resource settings, CSI-RS resource settings) and thresholds, area where measurement can be performed (frequency / cell list), measurement execution time, etc.) that the terminal must measure in the RRC INACTIVE state. In the above, the valid cell list (validity area) where surrounding cells can be measured refers to a list of cells where Layer 1 INACTIVE measurement can be performed in the cell on which the terminal camped, and can be interpreted as indicating that the terminal can process INACTIVE mode measurements in those cells. In addition, the above-mentioned measurement execution time setting may be defined as one or more of the following timers, which indicate the time at which the actual measurement is performed after the terminal is instructed to perform the setting or Layer 1 resource measurement.

[0184] - 1st Timer: Validity timer for when the terminal must perform L1 resource measurement after receiving L1 resource measurement-related settings in the RRCRelease message

[0185] - 2nd Timer: A validity timer that operates after receiving L1 resource measurement settings in the RRCRelease message and after receiving an explicit instruction for L1 resource measurement from the base station (explicit L1 resource measurement instructions are explained in detail below).

[0186] In addition, in the present invention, the method of providing L1 resource configuration information that the terminal must measure in the INACTIVE state in the RRCRelease message at step 1h-05 may be one of the following specific methods.

[0187] - Method for configuring Layer 1 resource measurement: A method to measure Layer 1 measurement resource settings configured in an RRC connection state (e.g., Layer 1 resource measurement settings for L1 / L2 triggered mobility (LTM)) as is, even in IDLE / INACTIVE state (no separate indicators or settings).

[0188] - Method for configuring Layer 2 L1 resource measurements: Measurement instruction using an indicator that specifies whether to continue using the Layer 1 measurement resource settings configured in the RRC connection state within the RRCR release message, even in the IDLE / INACTIVE state.

[0189] - 3rd L1 Resource Measurement Configuration Method: In the RRCRelease message, provide the L1 resource configuration information that the terminal needs to measure in the INACTIVE state as new configuration information.

[0190] - 4th L1 Resource Measurement Configuration Method: In addition to the RRCRElease message, the L1 resource configuration information that the terminal needs to measure in the INACTIVE state is provided as new configuration information from the System information.

[0191] The above L1 resource configuration information can be configured in one of the following forms.

[0192] - Option 1: Explicitly provide the L1 resource information to be measured, similar to the L1 resource measurement settings in the existing LTM (LTM-CSI-ResourceConfig in LTM-Config-r18)

[0193] - Option 2: Frequency / cell information to be measured is provided like existing IDLE measurement information, and the terminal measures SSB accordingly (MeasIdleConfig)

[0194] A terminal that has received L1 measurement resource settings via the above method performs Layer 1 INACTIVE measurement according to the settings in step 1h-10, and if there are related measurement timer settings, it can operate the timer according to the settings (1h-15). If there are no settings via RRCRelease but the system information of the cell the terminal camped in step 1h-20 provides Layer 1 INACTIVE measurement settings, the terminal can perform Layer 1 INACTIVE measurement by applying the settings of the system information. For reference, the case in which the terminal performs Layer 1 INACTIVE measurement by applying the settings of the system information corresponds to the case where SIB1 broadcasts whether the cell supports Layer 1 INACTIVE measurement and the cell instructs the broadcast of a specific SIBXX function (Layer 1 INACTIVE measurement). In addition, if the terminal receives a Layer 1 INACTIVE measurement setting in the RRCRelease message of the previous serving cell, the terminal may apply the Layer 1 INACTIVE measurement setting provided in the RRCRelease message of the previous serving cell without applying the SIBXX setting of the camped cell.

[0195] A terminal that receives an RRC release message containing information instructing a Layer 1 inactive measurement of a surrounding cell may start a measurement for the frequency and cells set in the inactive state and may operate an inactive state cell measurement timer. Here, the timer may be the first timer or the second timer described above. When the timer expires, the terminal may stop the related Layer 1 inactive measurement.

[0196] If the terminal transitions to an RRC connection state while the timer is operating, that is, before the timer expires (performing a random access procedure to the serving cell in steps 1h-25 to 1h-40 and transitioning to an RRC connection state in step 1h-45), the terminal stops the timer, and if the serving cell to which the terminal transitioned to the connection resume state requests Layer 1 INACTIVE mode measurements via an RRCResume message in step 1h-40, the terminal may send an RRC resume complete message (RRCResumeComplete) to the serving cell in step 1h-50, including measurements of surrounding cells measured by the terminal in the INACTIVE state. Alternatively, after sending the RRCResumeComplete message, the terminal may report to the serving cell that there is Layer 1 resource information measured via a specific MAC CE. In this case, the serving cell that receives the above message can know that there are measurements of surrounding cells taken by the terminal in the INACTIVE state, and the terminal can report the L1 resource measurements of surrounding cells taken in the INACTIVE state to the serving cell in step 1h-55 via a separate MAC CE or a UCI via PUSCH (physical uplink shared channel) / PUCCH (physical uplink control channel). Additionally, depending on the measured Layer 1 resource configuration method, it may be reported via a different signaling method. For example, event-based L1 reporting may be in the form of MAC CE, while reporting for which the base station explicitly requested it may be reported via UCI. Alternatively, all may be reported as RRC messages.

[0197] In particular, L1 resource reporting may be performed for SSB and CSI-RS resources, and includes channel measurements (RSRP, RSRQ) of the serving cell and measurements of surrounding cells that were instructed to measure, as well as one or more cell and beam measurements (RSRP, RSRQ). Additionally, to verify how up-to-date the Layer 1 inactive measurements reported by the terminal are, the serving cell sets a Validity time, and the terminal may report only valid measurements according to the setting.

[0198] - Validity time: measurements duration before msg1 transmission

[0199] In the above step, the base station that receives measurement values ​​for surrounding cells in the INACTIVE state from the terminal may provide SCell configuration information for CA to the terminal via an RRC reconfiguration message in step 1h-60, or enable CA via a SCell activation MAC CE. In this signaling, not only configuration and activation information for SCell may be provided, but also instructions to the optimal beam (TCI state instruction) and changes to the settings to the optimal MCS value may be given. Through this, the terminal can achieve fast CA and data performance optimization. For example, the following scenario may be applied.

[0200] - Scenario 1: SCell configuration information is provided in advance by the base station via RRCR-lease settings, and SCell activation is determined via MAC CE based on the terminal's L1 report after connecting to the serving cell. At this time, the optimal TCI state and MCS instructions are also provided (or relevant information is provided in the additional RRC information).

[0201] - Scenario 2: After the base station connects to the serving cell, it provides the addition and activation of the cell via RRC settings, TCI state instructions, and updates to MCS value settings based on the terminal's L1 report.

[0202] FIG. 1i is a diagram illustrating a second operation in which a terminal performs a Layer 1 measurement in INACTIVE mode and reports it, as part of Embodiment 5 proposed in the present invention. In particular, the difference between this embodiment and Embodiment 4 is that the method by which the base station instructs the terminal to perform a Layer 1 INACTIVE measurement is based on a paging signal rather than an RRCRelease message, and other procedures are the same as those in FIG. 1h.

[0203] A terminal (1i-01) in an RRC connection state may be connected to serving cell 1 (1i-02) and, in step 1i-05, receive an RRCRelease message including suspendConfig from the cell and transition to an RRC INACTIVE state. In the above step, the RRCRelease message may transmit to the terminal Layer 1 measurement information (Layer 1 INACTIVE measurement setting information; measurement frequency / carrier and cell / BWP, L1 resource settings requiring measurement (SSB resource settings, CSI-RS resource settings) and thresholds, the area where measurement can be performed (frequency / cell list), measurement execution time, etc.) that the terminal must measure in the RRC INACTIVE state. In the above, the valid cell list (validity area) that can measure surrounding cells refers to a list of cells that can perform INACTIVE Layer 1 measurement in the cell on which the terminal camped, and can be interpreted as indicating that the terminal can process INACTIVE mode measurement in those cells. In addition, the above-mentioned measurement execution time setting may be defined as one or more of the following timers, which indicate the time at which the actual measurement is performed after the terminal is instructed to perform the setting or Layer 1 resource measurement.

[0204] - 1st Timer: Validity timer for when the terminal must perform L1 resource measurement after receiving L1 resource measurement-related settings in the RRCRelease message

[0205] - 2nd Timer: A validity timer that operates after receiving L1 resource measurement settings in the RRCRelease message and after receiving an explicit instruction for L1 resource measurement from the base station (explicit L1 resource measurement instructions are explained in detail below).

[0206] In addition, in the present invention, the method of providing L1 resource configuration information that the terminal must measure in the INACTIVE state in the RRCRelease message at step 1i-05 may be one of the following specific methods.

[0207] - Method for configuring Layer 1 resource measurement: A method to measure Layer 1 measurement resource settings configured in an RRC connection state (e.g., Layer 1 resource measurement settings for L1 / L2 triggered mobility (LTM)) as is, even in IDLE / INACTIVE state (no separate indicators or settings).

[0208] - Method for configuring Layer 2 L1 resource measurements: Measurement instruction using an indicator that specifies whether to continue using the Layer 1 measurement resource settings configured in the RRC connection state within the RRCR release message, even in the IDLE / INACTIVE state.

[0209] - 3rd L1 Resource Measurement Configuration Method: In the RRCRelease message, provide the L1 resource configuration information that the terminal needs to measure in the INACTIVE state as new configuration information.

[0210] - 4th L1 Resource Measurement Configuration Method: In addition to the RRCRElease message, the L1 resource configuration information that the terminal needs to measure in the INACTIVE state is provided as new configuration information from the System information.

[0211] The above L1 resource configuration information can be configured in one of the following forms.

[0212] - Option 1: Explicitly provide the L1 resource information to be measured, similar to the L1 resource measurement settings in the existing LTM (LTM-CSI-ResourceConfig in LTM-Config-r18)

[0213] - Option 2: Frequency / cell information to be measured is provided like existing IDLE measurement information, and the terminal measures SSB accordingly (MeasIdleConfig)

[0214] If there is no configuration via RRCRelease but the system information of the cell the terminal is camping in step 1i-10 provides a Layer 1 INACTIVE measurement configuration, the terminal can perform a Layer 1 INACTIVE measurement by applying the configuration of the system information. For reference, the case where the terminal performs a Layer 1 INACTIVE measurement by applying the configuration of the system information corresponds to the case where SIB1 broadcasts whether the cell supports Layer 1 INACTIVE measurement and the cell instructs the broadcast of a specific SIBXX function (Layer 1 IDLE measurement). Additionally, if the terminal receives a Layer 1 INACTIVE measurement configuration via the RRCRelease message of the previous serving cell, the terminal can apply the Layer 1 INACTIVE measurement configuration provided in the RRCRelease message of the previous serving cell without applying the SIBXX configuration of the camped cell.

[0215] A terminal that receives an RRC release message containing Layer 1 INACTIVE measurement settings of a surrounding cell receives a paging (LAN paging) signal from the base station where the terminal is camp-on in step 1i-15 while in an INACTIVE state, and the paging message may include instructions for the terminal to start Layer 1 INACTIVE measurement. In step 1i-20, upon receiving the paging signal, the terminal starts measurements for the frequencies and cells set in the INACTIVE state and may activate an INACTIVE state cell measurement timer (1i-25). Here, the timer may be the first timer or the second timer described above. When the timer expires, the terminal may stop the related Layer 1 INACTIVE measurement.

[0216] If the terminal transitions to an RRC connected state while the timer is running, that is, before the timer expires (performing a random access procedure to the serving cell in steps 1i-30 to 1i-45 and transitioning to an RRC connected state in step 1i-50), the terminal stops the timer, and if the serving cell to which the terminal transitioned to the connection resume state requests Layer 1 INACTIVE mode measurements via an RRCResume message in step 1i-45, the terminal may send an RRC resume complete message (RRCResumeComplete) to the serving cell in step 1i-55, including measurements of surrounding cells measured by the terminal in the INACTIVE state. Alternatively, after sending the RRCResumeComplete message, the terminal may report that there is Layer 1 resource information measured via a specific MAC CE. In this case, the serving cell that receives the above message can know that there are measurements of surrounding cells taken by the terminal in the IDLE state, and the terminal can report the L1 resource measurements of surrounding cells taken in the INACTIVE state to the serving cell in step 1i-60 via a separate MAC CE or a UCI via PUSCH / PUCCH. Additionally, depending on the measured Layer 1 resource configuration method, it may be reported via different signaling methods. For example, event-based L1 reporting may be in the form of MAC CE, while reporting for which the base station explicitly requested it may be reported via UCI. Alternatively, all may be reported as RRC messages.

[0217] In particular, L1 resource reporting may be performed for SSB and CSI-RS resources, and includes channel measurements (RSRP, RSRQ) of the serving cell and measurements of surrounding cells that were instructed to measure, as well as one or more cell and beam measurements (RSRP, RSRQ). Additionally, to verify how up-to-date the Layer 1 inactive measurements reported by the terminal are, the serving cell sets a Validity time, and the terminal may report only valid measurements according to the setting.

[0218] - Validity time: measurements duration before msg1 transmission

[0219] In the above step, the base station that receives measurement values ​​regarding surrounding cells in the INACTIVE state from the terminal may provide SCell configuration information for CA to the terminal via an RRC reconfiguration message in step 1i-65, or enable CA via a SCell activation MAC CE. In this signaling, not only configuration and activation information for SCell may be provided, but also instructions to the optimal beam (TCI state instruction) and changes to the settings to the optimal MCS value may be given. Through this, the terminal can achieve fast CA and data performance optimization. For example, the following scenario may be applied.

[0220] - Scenario 1: SCell configuration information is provided in advance by the base station via RRCR-lease settings, and SCell activation is determined via MAC CE based on the terminal's L1 report after connecting to the serving cell. At this time, the optimal TCI state and MCS instructions are also provided (or relevant information is provided in the additional RRC information).

[0221] - Scenario 2: After the base station connects to the serving cell, it provides the addition and activation of the cell via RRC settings, TCI state instructions, and updates to MCS value settings based on the terminal's L1 report.

[0222] FIG. 1j is a diagram illustrating a third operation in which a terminal performs a Layer 1 measurement in INACTIVE mode and reports it, as 6 of the embodiment proposed in the present invention. In particular, the difference between this embodiment and embodiments 4 and 5 is that the method by which the base station instructs the terminal to perform a Layer 1 INACTIVE measurement is based on a signal after the RRC connection state, rather than an RRCR release message or a paging message, and other procedures are the same as those in FIG. 1h and 1i.

[0223] A terminal (1j-01) in an RRC connection state may be connected to serving cell 1 (1j-02) and, in step 1j-05, receive an RRCRelease message containing suspendConfig from the cell and transition to an RRC INACTIVE state. In the above step, the RRCRelease message may transmit to the terminal Layer 1 measurement information (Layer 1 INACTIVE measurement setting information; measurement frequency / carrier and cell / BWP, L1 resource settings requiring measurement (SSB resource settings, CSI-RS resource settings) and thresholds, an area where measurement can be performed (frequency / cell list), measurement execution time, etc.) that the terminal must measure in the RRC INACTIVE state. In the above, the valid cell list (validity area) where surrounding cells can be measured refers to a list of cells that can perform INACTIVE Layer 1 measurement in the cell where the terminal has camped on, and can be interpreted as indicating that the terminal can process INACTIVE mode measurement in those cells. In addition, the above-mentioned measurement execution time setting may be defined as one or more of the following timers, which indicate the time at which the actual measurement is performed after the terminal is instructed to perform the setting or Layer 1 resource measurement.

[0224] - 1st Timer: Validity timer for when the terminal must perform L1 resource measurement after receiving L1 resource measurement-related settings in the RRCRelease message

[0225] - 2nd Timer: A validity timer that operates after receiving L1 resource measurement settings in the RRCRelease message and after receiving an explicit instruction for L1 resource measurement from the base station (explicit L1 resource measurement instructions are explained in detail below).

[0226] In addition, in the present invention, the method of providing L1 resource configuration information that the terminal must measure in the INACTIVE state in the RRCRelease message at step 1j-05 may be one of the following specific methods.

[0227] - Method for configuring Layer 1 resource measurement: A method to measure Layer 1 measurement resource settings configured in an RRC connection state (e.g., Layer 1 resource measurement settings for L1 / L2 triggered mobility (LTM)) as is, even in IDLE / INACTIVE state (no separate indicators or settings).

[0228] - Method for configuring Layer 2 L1 resource measurements: Measurement instruction using an indicator that specifies whether to continue using the Layer 1 measurement resource settings configured in the RRC connection state within the RRCR release message, even in the IDLE / INACTIVE state.

[0229] - 3rd L1 Resource Measurement Configuration Method: In the RRCRelease message, provide the L1 resource configuration information that the terminal needs to measure in the INACTIVE state as new configuration information.

[0230] - 4th L1 Resource Measurement Configuration Method: In addition to the RRCRElease message, the L1 resource configuration information that the terminal needs to measure in the INACTIVE state is provided as new configuration information from the System information.

[0231] The above L1 resource configuration information can be configured in one of the following forms.

[0232] - Option 1: Explicitly provide the L1 resource information to be measured, similar to the L1 resource measurement settings in the existing LTM (LTM-CSI-ResourceConfig in LTM-Config-r18)

[0233] - Option 2: Frequency / cell information to be measured is provided like existing IDLE measurement information, and the terminal measures SSB accordingly (MeasIdleConfig)

[0234] If there is no configuration via RRCRelease but the system information of the cell the terminal is camping in step 1j-10 provides a Layer 1 INACTIVE measurement configuration, the terminal can perform a Layer 1 INACTIVE measurement by applying the configuration of the system information. For reference, the case where the terminal performs a Layer 1 INACTIVE measurement by applying the configuration of the system information corresponds to the case where SIB1 broadcasts whether the cell supports Layer 1 INACTIVE measurement and the cell instructs the broadcast of a specific SIBXX function (Layer 1 INACTIVE measurement). Additionally, if the terminal receives a Layer 1 INACTIVE measurement configuration via the RRCRelease message of the previous serving cell, the terminal can apply the Layer 1 INACTIVE measurement configuration provided in the RRCRelease message of the previous serving cell without applying the SIBXX configuration of the camped cell.

[0235] When a terminal receives an RRC release message containing a Layer 1 INACTIVE measurement setting from a neighboring cell and transitions to an RRC connected state (performing a random access procedure to the serving cell in steps 1j-15 to 1j-30 and transitioning to an RRC connected state), the terminal can perform a Layer 1 INACTIVE measurement of the neighboring cell by receiving a setting indicating a Layer 1 INACTIVE mode measurement value from the serving cell that has transitioned to the connected state via an RRCResume message. In step 1j-35, when the terminal receives a signal containing the above instruction, it can start measurements for the frequencies and cells set to be measured in the INACTIVE state and activate the INACTIVE state Layer 1 cell measurement timer. Here, the timer may be the first timer or the second timer described above. When the said timer expires, the terminal may stop the related Layer 1 INACTIVE measurement.

[0236] Alternatively, the L1 resource measurement instruction in step 1j-30 may be given via DCI or MAC CE in step 1j-40 instead of the RRCResume message. In this case, after the instruction via DCI or MAC CE, the terminal may start measurements for frequencies and cells set to be measured in the INACTIVE state and activate the INACTIVE state Layer 1 cell measurement timer. Here, the timer may be the first timer or the second timer described above. When the timer expires, the terminal may stop the related Layer 1 INACTIVE measurement.

[0237] In step 1j-45, the terminal may report the measurements of surrounding cells taken by the terminal while in the INACTIVE state to the corresponding serving cell via an RRC resume complete message (RRCResumeComplete), or transmit an RRC resume complete message (RRCResumeComplete) containing an indicator that the L1 measurements are stored (or an indicator that there is a relevant capability). In this case, after sending the RRCResumeComplete message, the terminal may report the measured Layer 1 resource measurements to the serving cell via specific MAC CE and UCI in step 1j-50. Additionally, depending on the method of configuring the measured Layer 1 resource, it may be reported via different signaling methods. For example, event-based L1 reporting may be in the form of MAC CE, while reporting for which the base station has made an explicit request may be reported via UCI. Alternatively, all may be reported as RRC messages.

[0238] In particular, L1 resource reporting may be performed for SSB and CSI-RS resources, and includes channel measurements (RSRP, RSRQ) of the serving cell and measurements of surrounding cells that were instructed to measure, as well as one or more cell and beam measurements (RSRP, RSRQ). Additionally, to verify how up-to-date the Layer 1 inactive measurements reported by the terminal are, the serving cell sets a Validity time, and the terminal may report only valid measurements according to the setting.

[0239] - Validity time: measurements duration before msg1 transmission

[0240] In the above step, the base station that receives measurement values ​​for surrounding cells in the INACTIVE state from the terminal may provide SCell configuration information for CA to the terminal via an RRC reconfiguration message in step 1j-55, or enable CA via a SCell activation MAC CE. In this signaling, not only configuration and activation information for SCell may be provided, but also instructions to the optimal beam (TCI state instruction) and changes to the settings to the optimal MCS value may be given. Through this, the terminal can achieve fast CA and data performance optimization. For example, the following scenario may be applied.

[0241] - Scenario 1: SCell configuration information is provided in advance by the base station via RRCR-lease settings, and SCell activation is determined via MAC CE based on the terminal's L1 report after connecting to the serving cell. At this time, the optimal TCI state and MCS instructions are also provided (or relevant information is provided in the additional RRC information).

[0242] - Scenario 2: After the base station connects to the serving cell, it provides the addition and activation of the cell via RRC settings, TCI state instructions, and updates to MCS value settings based on the terminal's L1 report.

[0243] FIG. 1k is a diagram illustrating the operation of a terminal proposed in the present invention performing a Layer 1 measurement in IDLE / INACVTIVE mode and reporting the measurement.

[0244] A terminal in an RRC connection state may receive an RRCRelease message from a serving cell in step 1k-05 and be instructed to transition to an RRC IDLE or RRC INACTIVE state. The RRCRelease message may provide a Layer 1 IDLE / INACTIVE measurement resource setting that the terminal can perform after transitioning to the RRC IDLE or RRC INACTIVE state. Refer to the embodiments of the present invention for a detailed setting method. In step 1k-10, the terminal transitions to an RRC IDLE or RRC INACTIVE state according to the base station instructions, and in step 1k-15, performs a Layer 1 IDLE measurement operation according to the settings and instructions of step 1k-05. At this time, if a timer related to the Layer 1 IDLE measurement is set, the terminal starts the timer. More precisely, the execution of the Layer 1 IDLE measurement operation in step 1k-15 may vary depending on how the base station issues the measurement instructions, and this is proposed by distinguishing it according to three methods in the embodiments of the present invention.

[0245] - Method 1 (Examples 1, 4): Performed immediately after receiving the Layer 1 IDLE measurement resource configuration in RRCRelease

[0246] - Method 2 (Examples 2, 5): Instruction to measure Layer 1 IDLE measurement resources via paging to a terminal in RRC IDLE / INACTIVE state

[0247] - Method 3 (Examples 3, 6): After the RRC connection status, instruct Layer 1 IDLE measurement resource measurement via RRC message or DCI / MAC CE

[0248] In step 1k-20, after the RRC connection is resumed (RRC setup and RRC resume procedures), the terminal reports the measured Layer 1 IDLE measurement result to the base station in accordance with the base station instructions. The Layer 1 IDLE measurement report may be included in an RRC message or performed via a new MAC CE and UCI. Alternatively, prior to the above procedure, the terminal may transmit a message (at least one of RRC, MAC CE, and UCI) to the base station to inform the base station of the information that there is a measured Layer 1 IDLE measurement value.

[0249] In step 1k-25, the terminal may receive RRC messages from the base station related to configuration changes, such as CA setup and activation, beam change instructions, and MCS value changes. Alternatively, some of the above functions may be indicated via MAC CE and DCI. In step 1k-30, the terminal performs data transmission and reception according to the updated configuration changes in the above steps.

[0250] FIG. 11 is a diagram illustrating the operation of a base station proposed in the present invention to set up and apply Layer 1 measurement in IDLE / INACVTIVE mode.

[0251] In step 1l-05, the serving cell may transmit an RRCRelease message to the terminal to instruct it to transition to an RRC IDLE or RRC INACTIVE state. The RRCRelease message may provide a Layer 1 IDLE / INACTIVE measurement resource setting that the terminal can perform after transitioning to the RRC IDLE or RRC INACTIVE state. For detailed setting methods, refer to the embodiments of the present invention. In step 1l-10, the base station may instruct the terminal to perform a Layer 1 IDLE measurement operation in the RRC IDLE or RRC INACTIVE state according to a separate instruction. More precisely, the performance of the Layer 1 IDLE measurement operation in step 1l-10 may vary depending on how the base station instructs the measurement, and this is proposed by distinguishing it according to three methods in the embodiments of the present invention.

[0252] - Method 1 (Examples 1, 4): Performed immediately after receiving the Layer 1 IDLE measurement resource configuration in RRCRelease

[0253] - Method 2 (Examples 2, 5): Instruction to measure Layer 1 IDLE measurement resources via paging to a terminal in RRC IDLE / INACTIVE state

[0254] - Method 3 (Examples 3, 6): After the RRC connection status, instruct Layer 1 IDLE measurement resource measurement via RRC message or DCI / MAC CE

[0255] In the RRC connection procedure with the terminal in step 11-15 (RRC setup and RRC resume procedure), the base station may check whether the terminal has a Layer 1 IDLE measurement, and if such function is confirmed, in step 11-20, the base station may instruct the terminal to report the measured Layer 1 IDLE measurement result to the base station. The instruction to report the Layer 1 IDLE measurement may be included in RRC messages such as RRCSetup and RRCResume messages or UEInformationRequest, or may be executed through new MAC CE and UCI. In step 11-25, the base station may receive the measured Layer 1 IDLE measurement value transmitted by the terminal. Such reporting may be performed by at least one of RRC messages, MAC CE, and UCI.

[0256] In step 1l-30, the base station may transmit RRC messages related to configuration changes, such as CA configuration and activation, beam change instructions, and MCS value changes, to the terminal based on the Layer 1 IDLE measurement report received. Alternatively, some of the above functions may be instructed via MAC CE and DCI.

[0257] FIG. 1m is a block diagram illustrating the internal structure of a terminal to which the present invention is applied.

[0258] Referring to the drawing above, the terminal includes an RF (Radio Frequency) processing unit (1m-10), a baseband processing unit (1m-20), a storage unit (1m-30), and a control unit (1m-40).

[0259] The RF processing unit (1m-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (1m-10) up-converts the baseband signal provided by the baseband processing unit (1m-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (1m-10) may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC (digital to analog converter), an ADC (analog to digital converter), etc. Although only one antenna is shown in the drawing, the terminal may be equipped with multiple antennas. In addition, the RF processing unit (1m-10) may include multiple RF chains. Furthermore, the RF processing unit (1m-10) may perform beamforming. For the above beamforming, the RF processing unit (1m-10) can adjust the phase and magnitude of each of the signals transmitted and received through multiple antennas or antenna elements. In addition, the RF processing unit can perform MIMO and can receive multiple layers when performing MIMO operation.

[0260] The baseband processing unit (1m-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (1m-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (1m-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (1m-10). For example, in the case of following the orthogonal frequency division multiplexing (OFDM) method, when transmitting data, the baseband processing unit (1m-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through inverse fast Fourier transform (IFFT) operations and cyclic prefix (CP) insertion. Additionally, upon receiving data, the baseband processing unit (1m-20) divides the baseband signal provided by the RF processing unit (1m-10) into OFDM symbol units, restores the signals mapped to subcarriers through a fast Fourier transform (FFT) operation, and then restores the received bit sequence through demodulation and decoding.

[0261] The baseband processing unit (1m-20) and the RF processing unit (1m-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (1m-20) and the RF processing unit (1m-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, or a communication unit. Furthermore, at least one of the baseband processing unit (1m-20) and the RF processing unit (1m-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. Additionally, at least one of the baseband processing unit (1m-20) and the RF processing unit (1m-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include wireless LAN (e.g., IEEE 802.11), cellular network (e.g., LTE), etc. In addition, the above different frequency bands may include super high frequency (SHF) bands (e.g., 2 NRHz, NRHz) and millimeter wave (e.g., 60 GHz) bands.

[0262] The storage unit (1m-30) stores data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (1m-30) can store information related to a second connection node that performs wireless communication using a second wireless connection technology. Additionally, the storage unit (1m-30) provides the stored data upon request from the control unit (1m-40).

[0263] The control unit (1m-40) controls the overall operations of the terminal. For example, the control unit (1m-40) transmits and receives signals through the baseband processing unit (1m-20) and the RF processing unit (1m-10). Additionally, the control unit (1m-40) writes and reads data to and from the storage unit (1m-40). To this end, the control unit (1m-40) may include at least one processor. For example, the control unit (1m-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as applications.

[0264] FIG. 1n is a block diagram showing the configuration of a base station according to the present invention.

[0265] As illustrated in the drawing above, the base station is configured to include an RF processing unit (1n-10), a baseband processing unit (1n-20), a backhaul communication unit (1n-30), a storage unit (1n-40), and a control unit (1n-50).

[0266] The RF processing unit (1n-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (1n-10) upconverts the baseband signal provided by the baseband processing unit (1n-20) into an RF band signal and transmits it through an antenna, and downconverts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (1n-10) may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although only one antenna is shown in the drawing, the first connection node may be equipped with multiple antennas. Additionally, the RF processing unit (1n-10) may include multiple RF chains. Furthermore, the RF processing unit (1n-10) may perform beamforming. For the above beamforming, the RF processing unit (1n-10) can adjust the phase and magnitude of each of the signals transmitted and received through a plurality of antennas or antenna elements. The RF processing unit can perform down-to-down MIMO operation by transmitting one or more layers.

[0267] The baseband processing unit (1n-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (1n-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (1n-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (1n-10). For example, in the case of following the OFDM method, when transmitting data, the baseband processing unit (1n-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through IFFT operation and CP insertion. Additionally, upon receiving data, the baseband processing unit (1n-20) divides the baseband signal provided by the RF processing unit (1n-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operations, and then restores the received bit sequence through demodulation and decoding. The baseband processing unit (1n-20) and the RF processing unit (1n-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (1n-20) and the RF processing unit (1n-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, a communication unit, or a wireless communication unit.

[0268] The backhaul communication unit (1n-30) provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit (1n-30) converts a bit sequence transmitted from the main base station to another node, e.g., an auxiliary base station, a core network, etc., into a physical signal, and converts a physical signal received from the other node into a bit sequence.

[0269] The storage unit (1n-40) stores data such as basic programs, application programs, and configuration information for the operation of the main station. In particular, the storage unit (1n-40) can store information regarding bearers assigned to connected terminals, measurement results reported from connected terminals, etc. Additionally, the storage unit (1n-40) can store information serving as a criterion for determining whether to provide or disconnect multiple connections to the terminals. Furthermore, the storage unit (1n-40) provides the stored data upon the request of the control unit (1n-50).

[0270] The control unit (1n-50) controls the overall operations of the main station. For example, the control unit (1n-50) transmits and receives signals through the baseband processing unit (1n-20) and the RF processing unit (1n-10) or through the backhaul communication unit (1n-30). Additionally, the control unit (1n-50) writes and reads data to and from the storage unit (1n-40). To this end, the control unit (1n-50) may include at least one processor.

[0271] FIG. 2 is a diagram showing the configuration of a terminal according to one embodiment of the present disclosure.

[0272] As illustrated in FIG. 2, the terminal of the present disclosure may include a transceiver (210), a memory (220), and a processor (230). The processor (230), the transceiver (210), and the memory (220) of the terminal may operate according to the communication method of the terminal described above. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more components or fewer components than the components described above. In addition, the processor (230), the transceiver (210), and the memory (220) may be implemented in the form of a single chip.

[0273] The transceiver (210) is a collective term for the receiver and the transmitter of a terminal and can transmit and receive signals with a base station or network entity. The signals transmitted and received with the base station may include control information and data. To this end, the transceiver (210) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver (210), and the components of the transceiver (210) are not limited to an RF transmitter and an RF receiver.

[0274] Additionally, the transmitting and receiving unit (210) may include a wired and wireless transmitting and receiving unit and may include various configurations for transmitting and receiving signals.

[0275] Additionally, the transmitting and receiving unit (210) can receive a signal through a wired or wireless channel and output it to a processor (230), and transmit the signal output from the processor (230) through a wired or wireless channel.

[0276] Additionally, the transmitting and receiving unit (210) receives a communication signal and outputs it to a processor, and can transmit the signal output from the processor to a network entity through a wired or wireless network.

[0277] The memory (220) can store programs and data necessary for the operation of the terminal. Additionally, the memory (220) can store control information or data included in signals obtained from the terminal. The memory (220) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD.

[0278] The processor (230) can control a series of processes to enable the terminal to operate according to the embodiments of the present disclosure described above. The processor (230) may include at least one processor. For example, the processor (230) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as applications.

[0279] FIG. 3 is a diagram showing the configuration of a base station according to one embodiment of the present disclosure.

[0280] As illustrated in FIG. 3, the base station of the present disclosure may include a transceiver (310), a memory (320), and a processor (330). The processor (330), transceiver (310), and memory (320) of the base station may operate according to the communication method of the base station described above. However, the components of the base station are not limited to the examples described above. For example, the base station may include more components or fewer components than the components described above. In addition, the processor (330), transceiver (310), and memory (320) may be implemented in the form of a single chip.

[0281] The transceiver unit (310) is a collective term for the receiver unit and the transmitter unit of a base station and can transmit and receive signals with a terminal or another base station. At this time, the signals transmitted and received may include control information and data. To this end, the transceiver unit (310) may be composed of an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that low-noise amplifies the received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver unit (310), and the components of the transceiver unit (310) are not limited to an RF transmitter and an RF receiver. The transceiver unit (310) may include a wired / wireless transceiver unit and may include various configurations for transmitting and receiving signals.

[0282] Additionally, the transceiver (310) can receive a signal through a communication channel (e.g., a wireless channel) and output it to a processor (330), and transmit the signal output from the processor (330) through the communication channel.

[0283] Additionally, the transmitting and receiving unit (310) can receive a communication signal and output it to a processor, and transmit the signal output from the processor to a terminal or network entity through a wired or wireless network.

[0284] The memory (320) can store programs and data necessary for the operation of the base station. Additionally, the memory (320) can store control information or data included in signals obtained from the base station. The memory (320) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD.

[0285] The processor (330) can control a series of processes to enable the base station to operate according to the embodiments of the present disclosure described above. The processor (330) may include at least one processor. Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0286] Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0287] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of this disclosure.

[0288] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disc storage devices, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0289] Additionally, the above program may be stored on an attachable storage device that can be accessed via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

[0290] In the specific embodiments of the present disclosure described above, the components included in the disclosure are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed of a singular form, or even if a component is expressed in the singular form, it may be composed of a plural form.

[0291] Meanwhile, although specific embodiments have been described in the detailed description of this disclosure, it is understood that various modifications are possible within the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof. In other words, it is obvious to those skilled in the art that other modifications based on the technical concept of this disclosure are possible. Furthermore, each of the above embodiments may be combined and operated as needed. For example, parts of the methods proposed in this disclosure may be combined to operate a base station and a terminal. Additionally, while the above embodiments are presented based on 5G and NR systems, other modifications based on the technical concept of the above embodiments may be implemented in other systems such as LTE, LTE-A, and LTE-A-Pro systems.

Claims

1. A method performed by a terminal of a wireless communication system, A step of receiving an RRC release message from a base station containing configuration information for an L1 (Layer 1) measurement to be performed in an RRC (radio resource control) idle state or an RRC inactive state; After transitioning to the RRC idle state or the RRC deactivated state, a step of performing the L1 measurement on a plurality of carriers based on the setting information; After transitioning to an RRC connected state, a step of transmitting information related to the result of the L1 measurement to the base station; and A method comprising the step of receiving configuration information for a SCell for Carrier Aggregation (CA) from the base station based on the transmitted information.

2. In Paragraph 1, A method characterized in that the above setting information includes at least one of frequency information for which the L1 measurement is to be performed, cell identifier information, and information indicating an SSB (synchronization signal block) resource or a CSI-RS (channel state information-reference signal) resource that is the target of the L1 measurement.

3. In Paragraph 1, The method further includes the step of receiving a paging message from the base station in the RRC idle state or the RRC disabled state. A method characterized in that the above L1 measurement is initiated based on a measurement instruction included in the paging message.

4. In Paragraph 1, The step of transmitting information related to the result of the above L1 measurement to the base station is, A method characterized by including the step of transmitting an RRC setup complete message or an RRC resume complete message including an indicator indicating that the result of the above L1 measurement is available.

5. A method performed by a base station of a wireless communication system, A step of transmitting to the terminal an RRC release message containing configuration information for an L1 (Layer 1) measurement to be performed in the RRC (radio resource control) idle state or RRC inactive state of the terminal; A step of receiving from the terminal, after the terminal transitions to an RRC connected state, information related to the result of the L1 measurement performed on a plurality of carriers in the RRC idle state or the RRC disabled state according to the setting information from the terminal; and A method comprising the step of transmitting configuration information of a SCell for Carrier Aggregation (CA) to the terminal based on the received information.

6. In Paragraph 5, A method characterized in that the above setting information includes at least one of frequency information for which the L1 measurement is to be performed, cell identifier information, and information indicating an SSB (synchronization signal block) resource or a CSI-RS (channel state information-reference signal) resource that is the target of the L1 measurement.

7. In Paragraph 5, The method further includes the step of transmitting a paging message to the terminal when the terminal is in the RRC idle state or the RRC disabled state. A method characterized in that the above L1 measurement is initiated based on a measurement instruction included in the paging message.

8. In Paragraph 5, The step of receiving information related to the result of the above L1 measurement from the terminal is: A method characterized by including the step of receiving an RRC setup complete message or an RRC resume complete message including an indicator indicating that the result of the above L1 measurement is available.

9. In a terminal of a wireless communication system, At least one transmitting and receiving unit; At least one processor connected to communicate with the above-mentioned at least one transmitting and receiving unit; and It includes one or more memories that are communicatably connected to the at least one processor and store instructions that can be executed individually or in any combination by the at least one processor. The above commands are the above terminal: Receive an RRC release message from a base station containing configuration information for an L1 (Layer 1) measurement to be performed in an RRC (radio resource control) idle state or RRC inactive state, and After transitioning to the above RRC idle state or the above RRC deactivated state, the L1 measurement is performed on a plurality of carriers based on the above setting information, and After transitioning to an RRC connected state, information related to the result of the L1 measurement is transmitted to the base station, and A terminal that receives configuration information for SCell for CA (Carrier Aggregation) from the base station based on the above-mentioned transmitted information.

10. In Paragraph 9, A terminal characterized in that the above-mentioned configuration information includes at least one of frequency information for which the L1 measurement is to be performed, cell identifier information, and information indicating an SSB (synchronization signal block) resource or a CSI-RS (channel state information-reference signal) resource that is the target of the L1 measurement.

11. In Paragraph 9, The above commands are the above terminal: To receive paging messages from the base station in the above RRC idle state or the above RRC disabled state, and A terminal characterized in that the above L1 measurement is initiated based on a measurement instruction included in the paging message.

12. In Paragraph 9, The above commands are the above terminal: A terminal characterized by transmitting information related to the result of the above L1 measurement to the base station by transmitting an RRC setup complete message or an RRC resume complete message including an indicator indicating that the result of the above L1 measurement is available.

13. In a base station of a wireless communication system, At least one transmitting and receiving unit; At least one processor connected to communicate with the above-mentioned at least one transmitting and receiving unit; and It includes one or more memories that are communicatably connected to the at least one processor and store instructions that can be executed individually or in any combination by the at least one processor. The above commands are the above base station: Transmit an RRC release message to the terminal containing configuration information for an L1 (Layer 1) measurement to be performed in the RRC (radio resource control) idle state or RRC inactive state of the terminal, and Information related to the results of the L1 measurements performed on a plurality of carriers in the RRC idle state or the RRC disabled state according to the setting information from the terminal is received from the terminal after the terminal transitions to the RRC connected state, and A base station that transmits configuration information of a SCell for Carrier Aggregation (CA) to the terminal based on the received information.

14. In Paragraph 13, A base station characterized in that the above-mentioned configuration information includes at least one of frequency information for which the L1 measurement is to be performed, cell identifier information, and information indicating an SSB (synchronization signal block) resource or a CSI-RS (channel state information-reference signal) resource that is the target of the L1 measurement.

15. In Paragraph 13, The above commands are the above base station: When the above terminal is in the RRC idle state or the RRC disabled state, send a paging message to the terminal, and A base station characterized in that the above L1 measurement is initiated based on a measurement instruction included in the paging message.

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