Method and device for reselecting cell on basis of low-power wake-up signal in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to the present disclosure, a method by which a terminal performs communication in a wireless communication system comprises: transmitting, to a base station, a terminal capability information message including preference information about a multi-USIM gap; receiving, from the base station, a configuration message including an assistance configuration related to a preference of the multi-USIM gap and an assistance configuration related to a priority of the multi-USIM gap; and, on the basis of a configuration message, transmitting, to the base station, a terminal assistance information message for providing information about the multi-USIM gap. The terminal assistance information message includes preference information about multi-USIM gaps in which collisions have occurred.

Description

Method and apparatus for reselecting a cell based on a low-power wake-up signal in a wireless communication system

[0001] The present disclosure relates to a wireless communication system, and in particular to an operation procedure and apparatus in which terminals having a wake-up receiver perform cell reselection based on a wake-up signal.

[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.

[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] As a result of the aforementioned development of mobile communication systems, it has become possible to provide various services; consequently, measures to effectively provide these services are required, and in particular, measures to reduce the power consumption of terminals are required.

[0009] The present disclosure provides a method and apparatus for performing cell reselection using a wake-up signal to reduce power consumption of a terminal having a wake-up receiver in a wireless communication system.

[0010] According to one embodiment of the present disclosure, a method performed by a terminal in a wireless communication system may include the steps of: transmitting a terminal capability information message to a base station that includes preference information regarding a multi-USIM gap; receiving a setting message from the base station that includes an auxiliary setting regarding the preference of the multi-USIM gap and an auxiliary setting regarding the priority of the multi-USIM gap; and transmitting a terminal auxiliary information message to provide information regarding the multi-USIM gap to the base station based on the setting message. The terminal auxiliary information message may include preference information regarding the maintenance of conflicting multi-USIM gaps.

[0011] According to one embodiment of the present disclosure, a method performed by a base station in a wireless communication system may include: receiving a terminal capability information message including preference information regarding a multi-USIM gap from a terminal; transmitting a setting message to the terminal including an auxiliary setting regarding the preference of a multi-USIM gap and an auxiliary setting regarding the priority of a multi-USIM gap; and receiving a terminal auxiliary information message including information regarding a multi-USIM gap from the terminal based on the setting message. The terminal auxiliary information message may include preference information regarding the maintenance of conflicting multi-USIM gaps.

[0012] According to one embodiment of the present disclosure, a terminal performing communication in a wireless communication system may include a memory storing a plurality of instructions and at least one processor executing a plurality of instructions stored in the memory. The terminal may transmit a terminal capability information message to a base station containing preference information regarding a multi-USIM gap by having a plurality of instructions executed individually or collectively by at least one processor. The terminal may receive a configuration message from a base station containing an auxiliary configuration regarding a preference for a multi-USIM gap and an auxiliary configuration regarding a priority of a multi-USIM gap by having a plurality of instructions executed individually or collectively by at least one processor. The terminal may transmit a terminal auxiliary information message to a base station to provide information regarding a multi-USIM gap based on the configuration message by having a plurality of instructions executed individually or collectively by at least one processor. The terminal auxiliary information message may include preference information regarding the maintenance of conflicting multi-USIM gaps.

[0013] FIG. 1a is a drawing illustrating the structure of an LTE system according to one embodiment of the present disclosure.

[0014] FIG. 1b is a diagram illustrating a wireless protocol structure in an LTE system according to one embodiment of the present disclosure.

[0015] FIG. 1c is a drawing illustrating the structure of a wireless communication system according to one embodiment of the present disclosure.

[0016] FIG. 1d is a diagram showing the wireless protocol structure of a wireless communication system according to one embodiment of the present disclosure.

[0017] FIG. 1e is a diagram showing a terminal in an RRC idle mode (RRC_IDLE) or RRC disabled state (RRC_INACTIVE) in a wireless communication system according to one embodiment of the present disclosure performing a cell reselection evaluation procedure.

[0018] FIG. 1f is a diagram illustrating a procedure in which a terminal performs an RRC connection establishment procedure with a base station according to one embodiment of the present disclosure to switch from an RRC idle mode (RRC_IDLE) to an RRC connected mode (RRC_CONNECTED).

[0019] FIG. 1g is a diagram illustrating a procedure in which a terminal performs an RRC connection resume procedure with a base station according to one embodiment of the present disclosure to switch from an RRC inactive mode (RRC_INACTIVE) to an RRC connected mode (RRC_CONNECTED).

[0020] FIG. 1h is a diagram illustrating a method in which a terminal supporting a low-power wake-up receiver in a wireless communication system according to one embodiment of the present disclosure performs an RRC connection establishment procedure or an RRC connection resume procedure.

[0021] FIG. 1i is a diagram illustrating a method in which a terminal supporting a low-power wake-up receiver in a wireless communication system according to one embodiment of the present disclosure selects one of a plurality of cells included in a cell list to perform an RRC connection establishment procedure or an RRC connection resume procedure.

[0022] FIGS. 1ja and 1jb are drawings illustrating a method in which a terminal supporting a low-power wake-up receiver in a wireless communication system according to one embodiment of the present disclosure selects one of a cell within a plurality of frequency bands to perform an RRC connection establishment procedure or an RRC connection resume procedure.

[0023] FIGS. 1ka and 1kb are drawings illustrating a method for a terminal supporting a low-power wake-up receiver in a wireless communication system according to one embodiment of the present disclosure to perform a random access procedure upon receiving a low-power wake-up signal (hereinafter LP-WUS) corresponding to itself.

[0024] FIG. 11 is a flowchart illustrating how a terminal (Multi-USIM UE, hereinafter MUSIM UE) supporting a plurality of USIMs (Universal Subscriber Identity Module, hereinafter USIM) in one embodiment of the present disclosure processes conflicting MUSIM gaps.

[0025] FIG. 1m is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present disclosure.

[0026] FIG. 1n is a block diagram showing the configuration of an NR base station according to one embodiment of the present disclosure.

[0027] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0028] While various details have been described for the purpose of facilitating understanding in describing the embodiments, it will be understood that some aspects of the present disclosure may be practiced without including all such details. Furthermore, various modifications and alternatives are possible regarding the details presented herein, and all of these should be considered to be included within the scope of the present disclosure. Meanwhile, descriptions of technical content that are widely known in the art and may unnecessarily obscure the understanding of the present disclosure may be appropriately omitted, and such omitted descriptions should also be understood to be included within the scope of the present disclosure.

[0029] 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 or different reference numbers.

[0030] The advantages and features of the present disclosure, and the methods for achieving them, will become clear through the embodiments described below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments presented below and may be implemented in various forms. Other features, aspects, and advantages disclosed in the present disclosure will become more clear through the following description of the present disclosure. The following embodiments are merely illustrative to aid in understanding the present disclosure and should not be interpreted in any way as limiting the scope or spirit of the present disclosure. Rather, the present disclosure includes all modifications, changes, and alternatives made within the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Identical or similar components throughout the disclosure are assigned identical or similar reference numerals. Furthermore, terms described below are defined with consideration of their function in the present disclosure and may be used differently depending on the user, operator, or convention. Accordingly, the definitions of terms should be interpreted based on the content of the entire present disclosure.

[0031] In the present disclosure, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams may be performed based on computer program instructions. Since these computer program instructions may be optionally loaded into at least one processor of a general-purpose computer, a computer for special purposes, or other programmable data processing equipment, the instructions performed through any one or any combination of at least one processor of the computer or other programmable data processing equipment create means for performing the functions described in the flow diagram block(s). Since these computer program instructions may 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 functions in a specific manner, the instructions stored in computer-available or computer-readable memory may also produce a manufactured item containing means of instruction for performing the functions 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).

[0032] 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 example, two blocks (or functions) described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to the corresponding function.

[0033] As used in the embodiments of the present disclosure, the term “part / module” refers to a software or hardware component such as a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC), and the “part / module” performs certain roles. However, the term including “part / module” is not limited to software or hardware. The “part / module” may be configured to reside in an addressable storage medium or may be configured to run one or more processors. Accordingly, by example, the “part / module” 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 / modules' may be combined into a smaller number of components and 'parts / modules' or further separated into additional components and 'parts / modules'. In addition, the components and 'parts / modules' may be implemented to utilize one or more CPUs (central processing units) within the device or secure multimedia card. Furthermore, in the embodiments, the 'parts / modules' may include one or more processors.

[0034] One or more computer programs may be stored as a whole in a single memory device, or one or more computer programs may be divided into different parts and stored across multiple memory devices.

[0035] Additionally, any / any function or operation described in this disclosure may be processed by a single processor or a combination of processors. The single processor or combination of processors may be a circuitry that performs processing, and may include an application processor (AP, e.g., a central processing unit (CPU)), a communication processor (CP, e.g., a modem), a graphics processing unit (GPU), a neural network processing unit (NPU) (e.g., an artificial intelligence (AI) chip), a Wi-Fi chip, a Bluetooth® chip, a global positioning system (GPS) chip, a near-field communication (NFC) chip, a connectivity chip, a sensor controller, a touch controller, a fingerprint sensor controller, a display driver integrated circuit (IC), an audio codec (CODEC) chip, a universal serial bus (USB) controller, a camera controller, an image processing IC, a microprocessor, a microcontroller, a digital signal processor, an FPGA, an ASIC, a microprocessor unit (MPU), a system-on-chip (SoC), an IC, or similar circuitry. The single processor or combination of processors described above can control the overall operation of an electronic device by executing instructions, such as an operating system, that can be stored in memory. Additionally, the processor or combination of processors can execute other processes or programs residing in memory (e.g., processes related to the present disclosure).

[0036] Additionally, it should be noted that various embodiments in the claims and description of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0037] Such software may be stored on a non-transitory computer-readable storage medium. A non-transitory computer-readable storage medium stores one or more computer programs (software modules), said one or more computer programs include computer-executable instructions that operate an electronic device to perform a method according to the present disclosure when executed individually or collectively by one or more processors of an electronic device. Alternatively, said software may be a computer program (or product) that includes instructions that operate an electronic device to perform a method according to the present disclosure when executed individually or collectively by one or more processors of an electronic device.

[0038] The software may be stored in a transient or non-transient storage device, for example, in the form of read-only memory (ROM) (whether or not it is erasable or rewritable), or random access memory (RAM), memory chips, devices, or integrated circuits (ICs). Additionally, the software may be stored in the form of an optically or magnetically readable medium, for example, a compact disc (CD), a digital multifunction disc (DVD), a magnetic disc, or a magnetic tape. It should be understood that the storage device and the storage medium are examples of non-transient machine-readable storage media suitable for storing programs for implementing various embodiments of the present disclosure. Accordingly, various embodiments of the present disclosure may provide a program comprising code for implementing an apparatus or method according to any one of the claims of the present disclosure, and a non-transient machine-readable storage medium storing such program.

[0039] In the following disclosure, determining the priority between A and B may be referred to in various ways, such as selecting the one with the higher priority according to a predetermined priority rule and performing the corresponding action, or omitting or dropping the action for the one with the lower priority.

[0040] Hereinafter, 'A or B' as described in the present disclosure may be understood as 'A and / or B', which may be understood as including 'A', or 'B', or 'A and B'.

[0041] Additionally, 'at least one of A, B, and C' described in the present disclosure may be understood to include 'A', or 'B', or 'C', or 'any combination of A, B, and C'.

[0042] Additionally, 'at least one of A, B, or C' described in the present disclosure may be understood to include 'A', or 'B', or 'C', or 'any combination of A, B, and C'.

[0043] Additionally, 'A / B' as described in the present disclosure may be understood as 'A and / or B', which may be understood as including 'A', or 'B', or 'A and B'.

[0044] Additionally, 'A, B' described in the present disclosure may be understood as 'A and / or B', which may be understood as including 'A', or 'B', or 'A and B'.

[0045] Additionally, 'A and B' described in the present disclosure may be understood as 'A and / or B', which may be understood as including 'A', or 'B', or 'A and B'.

[0046] Furthermore, the phrase "when conditions A and B are satisfied" as described in the present disclosure is not necessarily limited to cases where both conditions A and B are satisfied, but may be understood to include cases where either condition A or condition B is satisfied individually, cases where both conditions A and B are satisfied, or cases where one or more additional conditions are satisfied together.

[0047] Furthermore, throughout this disclosure, ordinal terms (and similar modifiers) such as 'first', 'second', 'third', etc. are used solely for the purpose of distinguishing various instances, occurrences, configurations, messages, stages, elements, or aspects of elements, operations, or information, as described below. Unless clearly required otherwise by the context, the use of such ordinal terms does not require that the elements, operations, or information distinguished by such terms be structurally different, numerically distinct, or substantially different. For example, 'first signal' and 'second signal' may represent instances of the same signal transmitted at different times, signals containing the same core information even with some variations, or signals having different content or characteristics depending on the specific context. Similarly, 'first value' and 'second value' may represent the same size measured or applied in different situations, or they may represent different sizes. Such interpretation must be determined based on the specific technical context, function, and relationship described in the relevant parts of the disclosure and claims.

[0048] Furthermore, although terms such as "first," "second," etc., as used in this disclosure are used for various elements such as information, objects, actions, and sequences, they are not intended to limit such elements to a specific order. These terms may be understood merely as distinguishing one element from another. For example, a first element may be referred to as a second element, and likewise, a second element may be referred to as a first element.

[0049] Additionally, the terms 'first' and 'second' described in this disclosure may be understood to refer to identical or different elements. For example, if an element is information, the first information and the second information may both be information, and depending on the case, they may be the same information or different information.

[0050] Furthermore, expressions such as "if" and "in case that" as described in the present disclosure or claims may be interpreted, depending on the context, as meaning "when or upon," "in response to," "based on," or "according to," and these expressions may be used interchangeably. In addition, other expressions having substantially the same meaning may be used as substitutes for these expressions, provided that they do not impair the technical features of the present disclosure. Furthermore, if a method step (e.g., a step of transmitting a signal) is performed in relation to such terms (e.g., "in case that" or similar expressions) in accordance with the disclosure of the present specification, this may be interpreted as the method step being performed in response to a prior determination that a specific element has a specific state (e.g., bit length exceeding X).

[0051] For example, physical layer signaling may be referred to as L1 (Layer 1) signaling and may include downlink control information (DCI). Additionally, upper layer signaling may include at least one of a medium access control (MAC) control message, a radio resource control (RRC) signaling message, a non-access stratum (NAS) signaling message, or an application layer message. The RRC signaling message may be referred to as L3 (Layer 3) signaling. However, upper layer signaling is not limited to the above examples.

[0052] Additionally, the term "not perform" as used in this disclosure or claims may be understood, depending on the context, to mean to omit or skip the corresponding step. Such a term may be replaced with other terms having the same or substantially similar meaning.

[0053] Additionally, the phrase “transmitting a message containing A and B” as described in the present disclosure may be interpreted to include not only (i) cases where A and B are transmitted as a single message, but also (ii) cases where A and B are transmitted individually through multiple messages (e.g., transmitting a first message containing A and a second message containing B). This interpretation may also apply to cases where messages containing two or more items, such as A, B, and C, are transmitted together or individually.

[0054] In addition, 'transmitting a message containing A and transmitting a message containing B' can also be interpreted as transmitting a single message containing A and B.

[0055] In the embodiments described in this disclosure, terms or components included in the disclosure may be expressed in the singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the context presented for convenience of explanation, and the disclosure is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed in the singular form, and even if a component is expressed in the singular form, it may be composed in the plural form.

[0056] The drawings or flowcharts described in this disclosure illustrate exemplary methods that may be implemented according to the principles of this disclosure, and various modifications may be made to the methods illustrated in the flowcharts of this disclosure. For example, although illustrated as a series of steps, the various steps of each drawing or flowchart may overlap, occur in parallel, occur in a different order, or occur multiple times. In other examples, any step may be omitted or replaced with another step.

[0057] Additionally, the process of the flowchart can be performed by an electronic device, and one or more steps of the flowchart can be implemented by one or more processors that execute instructions to perform specific functions.

[0058] The methods and apparatus proposed in the embodiments of the present disclosure may be disclosed together with drawings including flowcharts to illustrate exemplary methods that may be implemented according to the principles of the present disclosure. Such flowcharts may include different branches and / or sub-branches. It should be understood that the principles of the present disclosure are not limited to combinations of all branches and sub-branches disclosed in the embodiments, and may consist of at least one individual branch or individual sub-branch, in particular only a single branch or a single sub-branch.

[0059] The methods and devices proposed in the embodiments of the present disclosure below are not limited to each embodiment and may be utilized as a combination of all or part of the embodiments proposed in the disclosure. Accordingly, the embodiments of the present disclosure may be applied with some modifications within the scope that does not deviate significantly from the scope of the present disclosure, at the judgment of a person skilled in the art.

[0060] In this case, any wording mentioned in different embodiments may be used interchangeably, combined, or substituted if the concepts correspond. For example, regarding the same or corresponding concepts, even if the expression 'A' is used in one embodiment and the expression 'B' is used in another embodiment, they may be understood by interchangeably, substituted, or combined.

[0061] Terms used in the following description to identify connection nodes, terms referring to network entities, 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. Furthermore, where appropriate, such terms may be replaced with terms defined in similar technical specifications of standardization organizations such as 3GPP (3rd generation partnership project) Technical Specifications (TS) or ETSI (European Telecommunications Standards Institute).

[0062] Hereinafter, the base station is an entity that performs resource allocation of the terminal and may be at least one of gNode B, eNode B, Node B, BS (base station), wireless access unit, base station controller, or a node on the network.

[0063] In addition, the base station of the present disclosure may include a structure split into a central unit (CU) and a distributed unit (DU). In such a structure, the CU is responsible for the upper layer of the control and user plane, and the DU is responsible for the processing of wireless resources in the lower layer. The embodiments of the present disclosure can be equally applied to a 5G base station structure in which functions are split into the CU and DU as described above.

[0064] The terminal may include at least one of user equipment (UE), mobile station (MS), cellular phone, smartphone, computer, tablet, wearable device, Internet of Things (IoT) device, or other device / system capable of performing communication functions.

[0065] In the present disclosure, a downlink (DL) refers to a wireless transmission path of a signal transmitted by a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted by a terminal to a base station.

[0066] In addition, while a 5th generation mobile communication system (5G, new radio, NR) and a 6th generation mobile communication system (6G) may be described below as examples, embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, new advanced mobile communication systems developed after 5G and 6G may be included therein. Furthermore, the present disclosure may be applied to other communication systems (e.g., Wi-Fi systems) with some modifications made in the judgment of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0067] In the following description, the terms "physical channel" and "signal" may be used interchangeably with "data" or "control signal." For example, PDSCH (physical downlink shared channel) is a term referring to a physical channel through which data is transmitted, but PDSCH may also be used to refer to data. That is, in this disclosure, the expression "transmits a physical channel" may be interpreted as equivalent to the expression "transmits data or a signal through a physical channel."

[0068] In describing the present disclosure below, the term "upper layer signaling" may be a signaling corresponding to at least one or a combination of at least one of MIB (master information block), SIB (system information block), SIB M (M=1, 2, …), RRC, MAC CE, NAS (non-access stratum) signaling, or application layer messages. The RRC signaling may also be referred to as L3 signaling (layer 3 signaling).

[0069] Additionally, L1 signaling may be a signaling method corresponding to at least one or a combination of at least one of the following: a physical layer channel or signaling of a PDCCH (physical downlink control channel), a DCI, a UE-specific DCI, a group common DCI, a common DCI, a scheduling DCI (e.g., a DCI used for the purpose of scheduling downlink or uplink data), a non-scheduling DCI (e.g., a DCI not used for the purpose of scheduling downlink or uplink data), a PUCCH (physical uplink control channel), or an UCI (uplink control information). The above L1 signaling may also be referred to as physical layer signaling.

[0070] Hereinafter, the expression in the present disclosure or claims that information can be configured from a base station may mean that, depending on the context, a terminal receives said information from a base station through physical layer signaling or upper layer signaling, and such expression may be replaced with other terms having the same or substantially similar meaning.

[0071] For convenience of explanation, the present disclosure uses terms and names defined in 3GPP 5G / NR (5th Generation New Radio) standards (e.g., 3GPP Technical Specification 38 series) or 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) standards (e.g., 3GPP Technical Specification 36 series). However, the present disclosure is not limited by the above terms and names and may be equally applied to systems conforming to other standards. In the present disclosure, eNB may be used interchangeably with gNB for convenience of explanation. That is, a base station described as an eNB may represent a gNB.

[0072] FIG. 1a is a drawing illustrating the structure of an LTE system according to one embodiment of the present disclosure.

[0073] Referring to FIG. 1a, as illustrated, the wireless access network of the LTE system consists of a next-generation base station (Evolved Node B, hereinafter ENB, Node B or base station) (1a-05, 1a-10, 1a-15, 1a-20), an MME (1a-25, Mobility Management Entity), and an S-GW (1a-30, Serving-Gateway). A user terminal (User Equipment, hereinafter UE or terminal) (1a-35) connects to an external network through the ENB (1a-05 ~ 1a-20) and the S-GW (1a-30).

[0074] In FIG. 1a, the ENBs (1a-05 to 1a-20) correspond to the existing Node B of the UMTS system. The ENBs are connected to the UEs (1a-35) via a wireless channel and perform more complex roles than the existing Node B. In LTE systems, since all user traffic, including real-time services such as VoIP (Voice over IP) via the Internet Protocol, is serviced through a shared channel, a device is required to aggregate status information such as the buffer status, available transmission power status, and channel status of the UEs to perform scheduling; this is handled by the ENBs (1a-05 to 1a-20). A single ENB typically controls multiple cells. For example, to achieve a transmission speed of 100 Mbps, the LTE system uses Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as a wireless access technology, for instance, in a 20 MHz bandwidth. In addition, an Adaptive Modulation & Coding (hereinafter referred to as AMC) method is applied to determine the modulation scheme and channel coding rate according to the channel conditions of the terminal. The S-GW (1a-30) is a device that provides data bearers and creates or removes data bearers under the control of the MME (1a-25). The MME is a device that is responsible for various control functions as well as mobility management functions for the terminal and is connected to multiple base stations.

[0075] FIG. 1b is a diagram illustrating a wireless protocol structure in an LTE system according to one embodiment of the present disclosure.

[0076] Referring to Fig. 1b, the wireless protocol of the LTE system consists of PDCP (Packet Data Convergence Protocol 1b-05, 1b-40), RLC (Radio Link Control 1b-10, 1b-35), and MAC (Medium Access Control 1b-15, 1b-30) at the terminal and ENB, respectively. PDCP (Packet Data Convergence Protocol) (1b-05, 1b-40) is responsible for operations such as IP header compression / decompression. The main functions of PDCP are summarized as follows.

[0077] - Header compression and decompression features (ROHC only)

[0078] - User data transfer function (Transfer of user data)

[0079] - Sequential delivery function (In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM)

[0080] - Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0081] - Duplicate detection function (Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM)

[0082] - Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of ​​PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

[0083] - Encryption and decryption functions (Ciphering and deciphering)

[0084] - Timer-based SDU discard in uplink.

[0085] Radio Link Control (hereinafter referred to as RLC) (1b-10, 1b-35) reconstructs PDCP Packet Data Units (PDUs) into an appropriate size to perform ARQ operations, etc. The main functions of RLC are summarized as follows.

[0086] - Data transfer function (Transfer of upper layer PDUs)

[0087] - ARQ function (Error Correction through ARQ (only for AM data transfer))

[0088] - Concatenation, segmentation, and reassembly functions (Concatenation, segmentation, and reassembly of RLC SDUs (only for UM and AM data transfer))

[0089] - Re-segmentation function (Re-segmentation of RLC data PDUs (only for AM data transfer))

[0090] - Reordering function (Reordering of RLC data PDUs (only for UM and AM data transfer)

[0091] - Duplicate detection function (only for UM and AM data transfer)

[0092] - Error detection function (Protocol error detection (only for AM data transfer))

[0093] - RLC SDU deletion function (RLC SDU discard (only for UM and AM data transfer))

[0094] RLC re-establishment function

[0095] MAC (1b-15, 1b-30) is connected to multiple RLC layer devices configured in a terminal and performs the operation of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC are summarized as follows.

[0096] - Mapping function (Mapping between logical channels and transport channels)

[0097] - Multiplexing and demultiplexing function (Multiplexing / demultiplexing of MAC SDUs belonging to one or different logical channels into / from transport blocks (TB) delivered to / from the physical layer on transport channels)

[0098] - Scheduling information reporting function

[0099] - HARQ function (Error correction through HARQ)

[0100] - Priority handling between logical channels of one UE

[0101] - Priority handling between UEs by means of dynamic scheduling

[0102] - MBMS service identification function

[0103] - Transport format selection function

[0104] - Padding

[0105] The physical layer (1b-20, 1b-25) performs the operation of channel coding and modulating upper layer data, making it into 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.

[0106] FIG. 1c is a drawing illustrating the structure of a wireless communication system according to one embodiment of the present disclosure.

[0107] Referring to FIG. 1c, as illustrated, the wireless access network of a wireless communication system (hereinafter NR or 2g) consists of a next-generation base station (New Radio Node B, hereinafter NR gNB or NR base station) (1c-10) and an NR CN (1c-05, New Radio Core Network). A user terminal (New Radio User Equipment, hereinafter NR UE or terminal) (1c-15) can connect to an external network through the NR gNB (1c-10) and the NR CN (1c-05).

[0108] In FIG. 1c, the NR gNB (1c-10) corresponds to the eNB (Evolved Node B) of the existing LTE system. The NR gNB is connected to the NR UE (1c-15) via a wireless channel and can provide superior service compared to the existing Node B. In a wireless system according to one embodiment, 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 and perform scheduling, and this can be handled by the NR NB (1c-10). A single NR gNB can typically control multiple cells. To achieve ultra-high-speed data transmission compared to current 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 can be applied to determine the modulation scheme and channel coding rate according to the channel conditions of the terminal. The NR CN (1c-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 can be 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 (1c-25) via a network interface. The MME can be connected to the existing base station eNB (1c-30).

[0109] FIG. 1d is a diagram showing the wireless protocol structure of a wireless communication system according to one embodiment of the present disclosure.

[0110] Referring to FIG. 1d, the wireless protocol of a wireless communication system according to one embodiment consists of NR SDAP (1d-01, 1d-45), NR PDCP (1d-05, 1d-40), NR RLC (1d-10, 1d-35), and NR MAC (1d-15, 1d-30) at the terminal and the NR base station, respectively.

[0111] The main functions of NR SDAP(1d-01, 1d-45) may include some of the following functions.

[0112] User data transfer function (transfer of user plane data)

[0113] Mapping function between a QoS flow and a DRB for both DL and UL for uplink and downlink

[0114] Marking QoS flow ID in both DL and UL packets for uplink and downlink

[0115] A function that maps reflective QoS flow to the data bearer for the uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0116] 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.

[0117] The main functions of NR PDCP (1d-05, 1d-40) may include some of the following functions.

[0118] Header compression and decompression (ROHC only)

[0119] - User data transfer function (Transfer of user data)

[0120] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0121] - Out-of-sequence delivery of upper layer PDUs

[0122] - Reordering function (PDCP PDU reordering for reception)

[0123] - Duplicate detection function (Duplicate detection of lower layer SDUs)

[0124] - Retransmission of PDCP SDUs

[0125] - Encryption and decryption functions (Ciphering and deciphering)

[0126] - Timer-based SDU discard in uplink.

[0127] 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.

[0128] The main functions of NR RLC(1d-10, 1d-35) may include some of the following functions.

[0129] - Data transfer function (Transfer of upper layer PDUs)

[0130] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0131] - Out-of-sequence delivery of upper layer PDUs

[0132] - ARQ function (Error Correction through ARQ)

[0133] - Concatenation, segmentation, and reassembly functions of RLC SDUs

[0134] - Re-segmentation function (Re-segmentation of RLC data PDUs)

[0135] - Reordering function (Reordering of RLC data PDUs)

[0136] - Duplicate detection

[0137] - Error detection function (Protocol error detection)

[0138] - RLC SDU discard function

[0139] RLC re-establishment function

[0140] 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.

[0141] 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.

[0142] The NR MAC (1d-15, 1d-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.

[0143] - Mapping function (Mapping between logical channels and transport channels)

[0144] - Multiplexing and demultiplexing functions (Multiplexing / demultiplexing of MAC SDUs)

[0145] - Scheduling information reporting function

[0146] - HARQ function (Error correction through HARQ)

[0147] - Priority handling between logical channels of one UE

[0148] - Priority handling between UEs by means of dynamic scheduling

[0149] - MBMS service identification function

[0150] - Transport format selection function

[0151] - Padding

[0152] The NR PHY layer (1d-20, 1d-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.

[0153] FIG. 1e is a diagram showing a terminal in an RRC idle mode (RRC_IDLE) or RRC disabled state (RRC_INACTIVE) in a wireless communication system according to an embodiment of the present disclosure performing a cell reselection evaluation procedure.

[0154] The cell reselection evaluation procedure may mean a procedure for determining whether to maintain the current serving cell or reselect the cell to a neighbor cell when the quality of service of the serving cell currently camp-on becomes lower than the quality of service of a neighbor cell due to a predetermined reason or movement of a terminal in RRC idle mode (RRC_IDLE) or RRC inactive state (RRC_INACTIVE).

[0155] In the case of handover, whether to perform a handover operation is determined by the network (AMF or source gNB), whereas in the case of cell reselection, a terminal in an RRC idle mode or RRC disabled state can determine whether to perform a cell reselection operation itself based on cell measurement values. The cell that the terminal reselects may refer to a cell using the same NR frequency (NR intra-frequency or serving NR frequency) as the serving cell currently camp-on, a cell using a different NR frequency (NR inter-frequency) from the serving cell, or a cell located at a frequency using a different Radio Access Technology (hereinafter RAT) (inter-RAT frequency).

[0156] Referring to FIG. 1e, the terminal (1e-01) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with an NR cell (1e-02) (1e-03).

[0157] The NR cell (1e-02) may transmit an RRC disconnection message (RRCRelease) (1e-04) to disconnect the RRC connection with the terminal (1e-01) in the RRC connection mode. If the message contains suspend configuration information (suspendConfig), the terminal may transition to an RRC inactive mode (RRC_INACTIVE) (1e-05). If the message does not contain suspendConfig, the terminal may transition to an RRC idle mode (RRC_IDLE) (1e-05). The message may contain cellReselectionPriorities for the terminal to perform cell reselection. cellReselectionPriorities may contain at least one value among freqPriorityListEUTRA, freqPriorityListNR, and t320. If the value t320 is included, the terminal may drive the T320 timer with that value. Specifically, the configuration information included in the above RRCRelease message may be as shown in Table 0 below.

[0158] [Table 0]

[0159]

[0160]

[0161]

[0162]

[0163]

[0164] In step 1e-13, a terminal (1e-01) in an RRC idle mode or RRC disabled state can obtain essential system information from an NR cell (1e-02). In this disclosure, Master Information Block (MIB) and System Information Block 1 (SIB1) may be referred to as essential system information.

[0165] In step 1e-15, a terminal (1e-01) in an RRC idle mode or RRC inactive state can perform a cell selection procedure based on the essential system information obtained in step 1e-13. That is, the terminal can find an NR suitable cell belonging to the selected PLMN or SNPN and camp on to that cell. The cell camped on by the terminal may be referred to as a serving cell. In this disclosure, based on the 3GPP standard document "38.304: User Equipment (UE) procedures in Idle mode and RRC Inactive state," a cell may be defined as a suitable cell if the conditions in Table 1 below are satisfied.

[0166] [Table 1]

[0167]

[0168] For reference, the above terminal can determine that the cell selection criteria are fulfilled if the following mathematical formula 1 is satisfied.

[0169] [Mathematical Formula 1]

[0170] Srxlev>0 AND Squal>0

[0171] where

[0172] Srxlev = Qrxlevmeas - (Qrxlevmin + Qrxlevminoffset) - Pcompensation - Qoffsettemp,

[0173] Squal = Qqualmeas - (Qqualmin + Qqualminoffset) - Qoffsettemp

[0174]

[0175] In step 1e-20, a terminal (1e-01) in an RRC idle mode or RRC disabled state may obtain system information (e.g., SIB2, SIB3, SIB4, SIB5) containing cell reselection information from a serving cell (1e-02) to perform a cell reselection evaluation procedure. SIB2 may include information / parameters commonly applied to the RRC terminal for reselecting NR intra-frequency, NR inter-frequency, and inter-RAT frequency cells, and NR intra-frequency cell reselection information excluding information related to NR intra-frequency surrounding cells. For example, SIB2 may include one cell reselection priority setting information for the serving NR frequency (the frequency to which the currently camp-on cell belongs). The cell reselection priority setting information may refer to cellReselectionPriority and cellReselectionSubPriority. Specifically, cellReselectionPriority stores an integer value (e.g., an integer value from 0 to 7), and cellReselectionSubPriority stores a decimal value (e.g., a decimal value from 0.2, 0.4, 0.6, or 0.8). If both cellReselectionPriority and cellReselectionSubPriority are signaled, the terminal can derive a cell reselection priority value by adding the two values. For reference, a larger cell reselection priority value indicates a higher priority. Specifically, the cell reselection setting information broadcast on SIB2 may be as shown in Table 2 below.

[0176] [Table 2]

[0177]

[0178]

[0179]

[0180] SIB3 may include neighboring cell information / parameters for a terminal in RRC idle mode or RRC disabled state to re-select an NR intra-frequency cell. For example, SIB3 may broadcast an NR intra-frequency cell list (intraFreqNeighCellList), a list of cells for which NR intra-frequency cell re-selection is allowed (intraFreqAllowedCellList), and a list of cells for which NR intra-frequency cell re-selection is not allowed (intraFreqExcludedCellList). Specifically, SIB3 may broadcast the information in Table 3 below.

[0181] [Table 3]

[0182]

[0183]

[0184] SIB4 may include information / parameters for a terminal in RRC idle mode or RRC disabled state to reselect an NR inter-frequency cell. For example, SIB4 may broadcast one or more NR inter-frequencies, and may broadcast one cell reselection priority setting information for each NR inter-frequency. The cell reselection priority setting information for each NR inter-frequency refers to the contents described above (e.g., cellReselectionPriority and / or cellReselectionSubPriority mapped to each NR inter-frequency), but is characterized by the fact that one cell reselection priority setting information for each inter-frequency is broadcast optionally. Specifically, the information in Table 4 below may be broadcast to SIB4.

[0185] [Table 4]

[0186]

[0187]

[0188]

[0189]

[0190] SIB5 may include information / parameters for a terminal in RRC idle mode or RRC disabled state to reselect an inter-RAT frequency cell. For example, SIB5 may broadcast one or more EUTRA frequencies, and may broadcast one cell reselection priority setting information for each EUTRA frequency. The cell reselection priority setting information for each EUTRA frequency refers to the contents described above (e.g., cellReselectionPriority and / or cellReselectionSubPriority mapped to each EUTRA frequency), but is characterized by the fact that one cell reselection priority setting information for each EUTRA frequency is broadcast optionally. Specifically, the information in Table 5 below may be broadcast on SIB5.

[0191] [Table 5]

[0192]

[0193]

[0194] A terminal in RRC idle mode or an RRC disabled state may perform a cell reselection evaluation process. The cell reselection evaluation process may refer to a series of processes that involve handling reselection priorities, performing frequency measurements by applying measurement rules for cell reselection, and reselecting a cell by evaluating cell reselection criteria.

[0195] In step 1e-25, a terminal in RRC idle mode or RRC disabled state can determine reselection priority based on the RRC release message received in step 1e-04 or system information received in step 1e-20. If the RRC release message received in step 1e-04 includes cellReselectionPriorities and there is no t320 timer value in cellReselectionPriorities, or if the t320 timer value is set and the T320 timer is running, the terminal can determine reselection priority according to the RRC release message. That is, if cellReselectionPriorities included in the RRC release message can be applied, the terminal can determine reselection priority according to the RRC release message. If cellReselectionPriorities are not included in the RRC release message or cellReselectionPriorities are released, the terminal can determine reselection priority based on the system information received in step 1e-20. The terminal according to the present disclosure can determine whether the cell reselection priority for each NR inter-frequency or inter-RAT frequency has the same cell reselection priority as the NR frequency to which the serving cell belongs, has a higher cell reselection priority than the NR frequency to which the serving cell belongs, or has a lower cell reselection priority than the NR frequency to which the serving cell belongs, based on the cell reselection priority value mapped to the NR frequency to which the serving cell is currently camp-on.For example, in the system information obtained in step 1e-20, if the cell reselection priority value mapped to the NR frequency to which the serving cell currently camp-on belongs is 3, the cell reselection priority value of inter NR frequency 1 is 2, the cell reselection priority value of inter NR frequency 2 is 3, the cell reselection priority value of inter NR frequency 3 is 4, and the cell reselection priority value of EUTRA frequency 1 is 2, the terminal may determine inter NR frequency 1 and EUTRA frequency 1 as lower reselection priority, determine the cell reselection priority of inter NR frequency 2 as equal reselection priority, and determine the cell reselection priority of inter NR frequency 3 as higher reselection priority.

[0196] In step 1e-30, a terminal in RRC idle mode or RRC disabled state may perform frequency measurement for cell reselection. At this time, to minimize battery consumption, the terminal may perform frequency measurement using the following measurement rule according to the cell reselection priority determined in step 1e-25.

[0197] - The above terminal may not perform NR intra-frequency measurement if the following condition 1 is satisfied. Otherwise (for example, if the following condition 1 is not satisfied), the above terminal performs NR intra-frequency measurement.

[0198] * Condition 1: The serving cell's receive level (Srxlev) is greater than the SIntraSearchP threshold and the serving cell's receive quality (Squal) is greater than the SIntraSearchQ threshold (Serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ).

[0199] - For NR inter-frequency or inter-RAT frequency that has a higher reselection priority than the NR frequency of the current serving cell, the terminal can perform measurements in accordance with the 3GPP TS 38.133 standard.

[0200] - For an NR inter-frequency with a reselection priority lower than or equal to the NR frequency of the current serving cell and an inter-RAT frequency with a reselection priority lower than the NR frequency of the current serving cell, the terminal may not perform a measurement if the following condition 2 is satisfied. Otherwise (for example, if the following condition 2 is not satisfied), the terminal measures cells in an NR inter-frequency with a reselection priority lower than or equal to the NR frequency, or measures cells in an inter-RAT frequency with a reselection priority lower than the NR frequency.

[0201] * Condition 2: The serving cell's receive level (Srxlev) is greater than the SnonIntraSearchP threshold and the serving cell's receive quality (Squal) is greater than the SnonIntraSearchQ threshold (Serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ).

[0202] For reference, the aforementioned threshold values ​​(SintraSearchP, SintraSearchQ, SnonIntraSearchP, SnonintraSearchQ) can be broadcast from the system information obtained in step 1e-20.

[0203] If the above terminal supports relaxed measurement and relaxedMeasurement exists in SIB2, the above terminal can relax the necessary measurements according to the contents of Table 6 below.

[0204] [Table 6]

[0205]

[0206]

[0207]

[0208] For reference, the above terminal (1e-01) can measure the SS-RSRP (Synchronization Signal based Reference Signal Received Power) level and SS-RSRQ (Synchronization Signal based Reference Signal Received Quality) level for the serving cell at least once every M1*N1DRX cycle and evaluate the cell selection criteria (S criterion) of the above-described embodiment. The values ​​for M1 and N1 can be determined by the following Table 7.

[0209] [Table 7]

[0210]

[0211] M1=2 if SMTC periodicty ( ) > 20 ms and DRX cycle 0.64 seconds, otherwise M1=1

[0212] In step 1e-35, a terminal in RRC idle mode or RRC disabled state may decide to reselect a cell that satisfies the cell reselection criteria based on the measurements performed in step 1e-30. Different criteria may be applied to the cell reselection criteria depending on the cell reselection priority. If multiple cells satisfying the cell reselection criteria have different cell reselection priorities, reselecting a frequency / RAT cell with a higher priority shall take precedence over reselecting a frequency / RAT cell with a lower priority (Cell reselection to a higher priority RAT / frequency shall take precedence over a lower priority RAT / frequency if multiple cells of different priorities fulfil the cell reselection criteria). Specifically, the terminal's behavior regarding the reselection criteria for inter-frequency / inter-RAT cells that have a higher priority than the frequency of the currently serving cell is as follows.

[0213] - 1st operation:

[0214] If SIB2 broadcasts a threshold value for threshServingLowQ and 1 second has passed since the terminal camped on to the current serving cell, and the signal quality (Squal) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,HighQ during a specific time interval TreselectionRAT (Squal > ThreshX,HighQ during a time interval TreselectionRAT), the terminal performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0215] - Second operation:

[0216] If the above terminal fails to perform the first operation, it performs the second operation.

[0217] * If 1 second has passed since the above terminal camped on to the current serving cell and the reception level (Srxlev) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX,HighP during a specific time interval TreselectionRAT (Srxlev > ThreshX, HighP during a time interval Treselection-RAT-), the terminal performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0218] Here, the terminal performs the first or second operation based on the information contained in SIB4 broadcast from the serving cell regarding the signal quality (Squal), reception level (Srxlev), threshold values ​​(ThrehX, HighQ, ThreshX, HighP), and TreselectionRAT values ​​of the inter-frequency cell, and performs the first or second operation based on the information contained in SIB5 broadcast from the serving cell regarding the signal quality (Squal), reception level (Srxlev), threshold values ​​(ThreshX, HighQ, ThreshX, HighP), and TreselectionRAT values ​​of the inter-RAT cell. For example, SIB4 includes Qqualmin values ​​or Qrxlevmin values, and the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell is derived based on this. If there are multiple cells in the NR frequency that satisfy the high cell reselection priority, the terminal can reselect the highest ranked cell from among the cells that satisfy the reselection criteria for intra-frequency / inter-frequency cells that have the same priority as the frequency of the currently serving cell described below.

[0219] In addition, the terminal's operation regarding the reselection criteria for intra-frequency / inter-frequency cells having the same priority as the current serving cell's frequency is as follows.

[0220] - 3rd operation:

[0221] * When the signal quality (Squal) and reception level (Srxlev) of an intra-frequency / inter-frequency cell are greater than 0, the cell-specific Rank is derived based on the measured value (RSRP) (The UE shall perform ranking of all cells that fulfills the cell selection criterion S). The Ranks of the serving cell and surrounding cells are calculated respectively through the following Equation 2.

[0222] [Mathematical Formula 2]

[0223]

[0224] Here, Qmeas,s is the RSRP measurement of the serving cell, Qmeas,n is the RSRP measurement of the surrounding cell, Qhyst is the hysteresis value of the serving cell, and Qoffset is the offset between the serving cell and the surrounding cell. The Qhyst value is included in SIB2 and is used commonly for the reselection of intra-frequency / inter-frequency cells. In the case of reselection of an intra-frequency cell, Qoffset is signaled per cell and applied only to the specified cell, and is included in SIB3. In the case of reselection of an inter-frequency cell, Qoffset is signaled per cell and applied only to the specified cell, and is included in SIB4. If the Rank of the surrounding cell calculated from Equation 2 above is greater than the Rank of the serving cell (Rn > Rs), the optimal cell among the surrounding cells is reselected.

[0225] Here, Qoffset-temp-- is an offset temporarily applied to the cell, which may refer to the connEstFailOffset included in ConnEstFailureControld broadcast from SIB1, and can be applied in the event of an RRC connection failure (e.g., when the T300 timer expires).

[0226] In addition, the terminal's operation regarding the reselection criteria for inter-frequency / inter-RAT cells with a lower priority than the frequency of the current serving cell is as follows.

[0227] - 4th Action:

[0228] If SIB2 broadcasts a threshold value for threshServingLowQ and 1 second has passed since the terminal camped on to the current serving cell, and the signal quality (Squal) of the current serving cell is smaller than the threshold ThreshServing, LowQ (Squal < ThreshServing, LowQ) and the signal quality (Squal) of the inter-frequency / inter-RAT cell is larger than the threshold ThreshX, LowQ during a specific time interval TreselectionRAT (Squal > ThreshX, LowQ during a time interval TreselectionRAT), the terminal performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0229] - Fifth Action:

[0230] If the above terminal fails to perform the 4th operation, it performs the 5th operation.

[0231] * When 1 second has passed since the above terminal camp-on to the current serving cell, and the reception level (Srxlev) of the current serving cell is less than the threshold ThreshServing, LowP (Srxlev < ThreshServing, LowP), and the reception level (Srxlev) of the inter-frequency / inter-RAT cell is greater than the threshold ThreshX, LowQ during a specific time interval TreselectionRAT (Srxlev > ThreshX,LowP during a time interval TreselectionRAT), the terminal performs reselection to the corresponding inter-frequency / inter-RAT cell.

[0232] Here, the fourth or fifth operation for the inter-frequency cell of the terminal is performed based on the threshold values ​​(ThreshServing, LowQ, ThreshServing, LowP) included in SIB2 broadcast from the serving cell and the signal quality (Squal), reception level (Srxlev), threshold values ​​(ThrehX, LowQ, ThreshX, LowP), and TreselectionRAT of the inter-frequency cell included in SIB4 broadcast from the serving cell, and the fourth or fifth operation for the inter-RAT cell of the terminal is performed based on the threshold values ​​(ThreshServing, LowQ, ThreshServing, LowP) included in SIB2 broadcast from the serving cell and the signal quality (Squal), reception level (Srxlev), threshold values ​​(ThreshX, LowQ, ThreshX, LowP), and TreselectionRAT of the inter-RAT cell included in SIB5 broadcast from the serving cell. For example, SIB4 includes Qqualmin values ​​or Qrxlevmin values, and based on this, the signal quality (Squal) or reception level (Srxlev) of the inter-frequency cell is derived. If there are multiple cells in the NR frequency that satisfy the high cell reselection priority, the terminal can reselect the highest-ranked cell from among the cells that satisfy the intra-frequency / inter-frequency cell reselection criteria having the same priority as the frequency of the currently serving cell described below.

[0233] In step 1e-40, a terminal in an RRC idle mode or RRC disabled state receives system information (e.g., MIB or SIB1) broadcast from a candidate target cell before finally re-selecting a candidate target cell, and based on the received system information, determines whether the reception level (Srxlev) and reception quality (Squal) of the candidate target cell satisfy a cell selection criterion called the S-criterion (Equation 1) (Srxlev > 0 AND Squal > 0). If Equation 1 is satisfied and the candidate target cell is suitable, the terminal may re-select the candidate target cell.

[0234] FIG. 1f is a diagram illustrating a procedure in which a terminal performs an RRC connection establishment procedure with a base station according to one embodiment of the present disclosure to switch from an RRC idle mode (RRC_IDLE) to an RRC connected mode (RRC_CONNECTED).

[0235] Referring to FIG. 1f, a terminal (1f-01) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with a base station (1f-02) (1f-05). If the terminal transmitting and receiving data in the RRC connection mode does not transmit or receive data for a certain reason or for a certain period of time, the base station may cause the terminal to switch to an RRC idle mode (RRC_IDLE) by transmitting an RRC disconnection message (RRCRelease message) that does not include suspend configuration information (suspendConfig) (1f-10). The terminal that has transitioned to the RRC idle mode (1f-11) can find a suitable cell and camp on it through a cell selection procedure and / or a cell re-selection procedure to receive system information (1f-15).

[0236] A terminal (1f-01) can perform a Random Access procedure to establish an RRC connection with a base station (1f-02). When Random Access is triggered (1f-16), the terminal can select a PRACH occasion and transmit a Random Access Preamble to the base station (1f-20). Upon receiving the Random Access Preamble, the base station can transmit a Random Access Response (hereinafter RAR) message to the terminal (1f-25). A terminal (1f-01) in RRC idle mode can establish a reverse transmission synchronization with the base station (1f-02) through steps 1f-20 and 1f-25.

[0237] A terminal (1f-01) in an RRC idle mode that has established reverse transmission synchronization can perform an RRC connection establishment procedure with a base station (1f-02). The terminal can drive a T300 timer and initiate the transmission of an RRC connection establishment request message to send the RRC connection establishment request message to the base station (1f-30). The message may include the terminal's identifier (ue-Identity) and the reason for establishing the RRC connection (establishmentCause). Upon receiving the RRC connection establishment request message, the base station may send an RRC connection establishment message to the terminal (1f-35). The message may include radio bearer configuration information and master cell group configuration information. Specifically, the wireless bearer configuration information and master cell group configuration information may include information involving an SRB1 (Signaling Radio Bearer 1) connection, RLC bearer configuration information for SRB1, MAC cell group configuration information (mac-CellGroupConfig), physical cell group configuration information (physicalCellGroupConfig), etc. That is, the establishment of an RRC connection may involve an SRB1 connection and may not involve other wireless bearer connections excluding SRB1 (for example, it does not involve an SRB2 for transmitting and receiving NAS messages between the terminal and the base station or a DRB (Data Radio Bearer) connection for transmitting and receiving data). When an RRC connection configuration message is received, the terminal may apply the above information and switch to an RRC connection mode (1f-36). The terminal that has switched to an RRC connection mode may transmit an RRC connection setup completion message (RRCSetupComplete message) to the base station via SRB1 (1f-40).The message may include a service request message in which the terminal requests an Access Management Function (AMF) or Mobility Management Entity (MME) to configure a bearer for a specific service.

[0238] When the RRC connection establishment procedure is successfully performed, the base station (1f-02) can send a SecurityModeCommand message to the terminal (1f-01) in RRC connection mode to activate AS Security (1f-45). When the terminal receives the SecurityModeCommand message, it can send a SecurityModeComplete message to the base station (1f-50).

[0239] The base station (1f-02) may perform an RRC reconfiguration procedure with the terminal (1f-01) when transmitting a security mode command message, after transmitting the security mode command message, or after receiving the security mode completion message. First, the base station may transmit an RRC reconfiguration message to the terminal (1f-55). The message may include some or all of the following information.

[0240] - Directive (fullConfig) indicating whether to apply full configuration information

[0241] - Radio Bearer Configuration Information (radioBearerConfig): radioBearerConfig may include at least one of the following information.

[0242] * SRB list to be added or modified (srb-ToAddModList): srb-ToAddModList may include one or more SRB configuration information (SRB-ToAddMod), and each SRB-ToAddMod may include an SRB identifier (srb-Identity), an indicator (reestablishmentPDCP) indicating whether to re-establish PDCP, an indicator indicating whether to discard Service Data Units (SDU) and Protocol Data Units (PDU) stored in the terminal, or PDCP configuration information (pdcp-Config).

[0243] * Indicator for whether to release SRB3 (srb3-ToRelease): SRB3 can be released only through SRB1, and SRB3 can be released only when releasing the Secondary Cell Group (hereinafter SCG) configured for the terminal and / or by reconfiguration with sync.

[0244] * List of DRBs to be added or modified (drb-ToAddModList): drb-ToAddModList may contain one or more DRB configuration information (DRB-ToAddMod), and each DRB-ToAddMod may contain a DRB identifier (drb-Identity), an indicator indicating whether to re-establish PDCP (reestablishmentPDCP), an indicator indicating whether PDCP will perform a recovery procedure (recoverPDCP), PDCP configuration information (pdcp-Config), or information indicating whether the bearer is associated with eps-bearerIdentity or SDAP configuration information (sdap-Config) (cnAssociation). cnAssociation may include eps-BearerIdentity if connected to EPC and sdap-Config if connected to 5GC.

[0245] * List of DRBs to be released (drb-ToReleaseList): drb-ToReleaseList may include one or more DRB identifiers (DRB-Identity) to be released.

[0246] * Security configuration information (securityConfig): securityConfig may include information indicating whether to use a master key (key for Master Cell Group (hereinafter MCG)) or a secondary key (key for SCG) to derive a key for security algorithm configuration information (SecurityAlgorithmConfig) or for ciphering and / or integrity protection.

[0247] - Master cell group configuration information (masterCellGroup): masterCellGroupConfig may include at least one of the following information.

[0248] * Information that identifies a cell group (cellGroupId): CellGroupId can be indicated by a single value. For example, if indicated by 0, it may represent MCG, and if indicated by another value, it may represent SCGs.

[0249] * List of RLC bearer configuration information to be added or modified (rlc-BearerToAddModList): rlc-BearerToAddModList may contain one or more RLC bearer configuration information (RLC-BearerConfig), and each RLC-BearerConfig may contain a logical channel identifier (logicalChannelIdentity), an SRB identifier (srb-Idendity) or DRB identifier (drb-Identity) associated with the RLC bearer, an indicator indicating whether the RLC should be reestablished (reestablishRLC), RLC configuration information (rlc-Config), or MAC-LogicalChannelConfig containing logical channel information.

[0250] * List of RLC bearer configuration information to be released (rlc-BearerToReleaseList): May include one or more logicalChannelIdentities associated with the RLC bearer to be released.

[0251] MAC Cell Group Configuration Information (mac-CellGroupConfig)

[0252] * PHYSICAL cell group configuration information (physical-CellGroupConfig)

[0253] * Configuration information for SpCell (spCellConfig): spCellConfig may include an index (servCellIndex) that can identify the SpCell (meaning Primary Cell (PCell) of MCG or Primary SCG Cell (PSCell) of SCG), parameters for synchronous reconfiguration in the target SpCell (reconfigurationWithSync), information on whether to set or disable parameters containing timer values ​​and constant values ​​for detecting and triggering cell-level wireless link failure (rlf-TimerAndConstants), rlmInSyncOutOfSyncThreshold, or spCellConfigDedicated.

[0254] List of SCell setting information to add or modify (sCellToAddModList)

[0255] * List of SCell settings to be released (sCellToReleaseList)

[0256] * Measurement configuration information (measConfig)

[0257] * Master Key configuration information to update (masterKeyUpdate): masterKeyUpdate may include keySetChangeIndicator, nextHopChainingCount, or nas-Container. masterKeyUpdate must always be included when an RRC connection reconfiguration procedure is performed due to a handover that requires changing the security algorithm, and may be optionally included if ReconfigurationWithSync is included in other cases.

[0258] The above message may additionally include dedicatedNAS-MessageList, dedicatedSIB1-Delivery, dedicatedSystemInformationDelivery, or otherConfig. A terminal that receives an RRC connection reconfiguration message may apply the above information and then send an RRC connection reconfiguration completion message (RRCReconfigurationComplete message) to the base station (1f-60).

[0259] FIG. 1g is a diagram illustrating a procedure in which a terminal performs an RRC connection resume procedure with a base station according to one embodiment of the present disclosure to switch from an RRC inactive mode (RRC_INACTIVE) to an RRC connected mode (RRC_CONNECTED).

[0260] Referring to FIG. 1g, a terminal (1g-01) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with a base station (1g-02) (1g-05). If a terminal transmitting and receiving data in the RRC connection mode does not transmit or receive data for a certain reason or for a certain period of time, the base station may transmit an RRC disconnection message (RRCRelease message) including suspend configuration information (suspendConfig) to cause the terminal to switch to an RRC inactive mode (RRC_INACTIVE) (1g-10). A terminal that has transitioned to an RRC inactive mode (1g-11) can find a suitable cell and camp on it through a cell selection procedure and / or a cell re-selection procedure to receive system information (1g-15).

[0261] The terminal (1g-01) can perform a Random Access procedure to resume an RRC connection with the base station (1g-02). When Random Access is triggered (1g-16), the terminal can select a PRACH occasion and transmit a Random Access Preamble to the base station (1g-20). Upon receiving the Random Access Preamble, the base station can transmit a Random Access Response (hereinafter RAR) message to the terminal (1g-25). The terminal (1g-01) in RRC disabled mode can establish reverse transmission synchronization with the base station (1g-02) through steps 1g-20 and 1g-25.

[0262] A terminal (1g-01) in an RRC disabled mode that has established reverse transmission synchronization can perform an RRC connection resume procedure with a base station (1g-02). The terminal can drive a T319 timer and initiate the transmission of an RRC connection resume request message or an RRC connection resume request 1 message to transmit the RRC connection resume request message or the RRC connection resume request 1 message to the base station (1g-30). The RRC connection resume request message or the RRC connection resume request 1 message may include the terminal's identifier (resumeIdentity) for reclaiming the terminal context from the base station, resume encryption information (resumeMAC-I), and the reason for resuming the RRC connection (resumeCause). Upon receiving the RRC connection resume request message or the RRC connection resume request 1 message, the base station can transmit an RRC connection resume message (RRCResume message) to the terminal (1g-35). The message may include radio bearer configuration information (radioBearerConfig), master cell group configuration information (masterCellGroup), measurement configuration information (measConfig), etc. Specifically, the radio bearer configuration information and master cell group configuration information may include configuration information for one or more SRBs (Signaling Radio Bearers) to be resumed, configuration information for one or more DRBs (Data Radio Bearers), RLC bearer configuration information, MAC cell group configuration information (mac-CellGroupConfig), physical cell group configuration information (physicalCellGroupConfig), etc. When an RRC connection resumption message is received, the terminal may apply the above information and switch to RRC connection mode (2f-36).A terminal that has switched to RRC connection mode can send an RRC connection resumption completion message (RRCResumeComplete message) to the base station via SRB1 (2f-40).

[0263] After successfully performing the RRC connection resumption procedure, the RRC connection reconfiguration procedure can be performed with the terminal (1g-01). First, the base station can transmit an RRC connection reconfiguration message to the terminal (1g-45). The message may include some or all of the following information.

[0264] - Directive (fullConfig) indicating whether to apply full configuration information

[0265] - Radio Bearer Configuration Information (radioBearerConfig): radioBearerConfig may include at least one of the following information.

[0266] * SRB list to be added or modified (srb-ToAddModList): srb-ToAddModList may include one or more SRB configuration information (SRB-ToAddMod), and each SRB-ToAddMod may include an SRB identifier (srb-Identity), an indicator (reestablishmentPDCP) indicating whether to re-establish PDCP, an indicator indicating whether to discard Service Data Units (SDU) and Protocol Data Units (PDU) stored in the terminal, or PDCP configuration information (pdcp-Config).

[0267] * Indicator for whether to release SRB3 (srb3-ToRelease): SRB3 can be released only through SRB1, and SRB3 can be released only when releasing the Secondary Cell Group (hereinafter SCG) configured for the terminal and / or by reconfiguration with sync.

[0268] * List of DRBs to be added or modified (drb-ToAddModList): drb-ToAddModList may contain one or more DRB configuration information (DRB-ToAddMod), and each DRB-ToAddMod may contain a DRB identifier (drb-Identity), an indicator indicating whether to re-establish PDCP (reestablishmentPDCP), an indicator indicating whether PDCP will perform a recovery procedure (recoverPDCP), PDCP configuration information (pdcp-Config), or information indicating whether the bearer is associated with eps-bearerIdentity or SDAP configuration information (sdap-Config) (cnAssociation). cnAssociation may include eps-BearerIdentity if connected to EPC and sdap-Config if connected to 5GC.

[0269] * List of DRBs to be released (drb-ToReleaseList): drb-ToReleaseList may include one or more DRB identifiers (DRB-Identity) to be released.

[0270] * Security configuration information (securityConfig): securityConfig may include information indicating whether to use a master key (key for Master Cell Group (hereinafter MCG)) or a secondary key (key for SCG) to derive a key for security algorithm configuration information (SecurityAlgorithmConfig) or for ciphering and / or integrity protection.

[0271] - Master cell group configuration information (masterCellGroup): masterCellGroupConfig may include at least one of the following information.

[0272] * Information that identifies a cell group (cellGroupId): CellGroupId can be indicated by a single value. For example, if indicated by 0, it may represent MCG, and if indicated by another value, it may represent SCGs.

[0273] * List of RLC bearer configuration information to be added or modified (rlc-BearerToAddModList): rlc-BearerToAddModList may contain one or more RLC bearer configuration information (RLC-BearerConfig), and each RLC-BearerConfig may contain a logical channel identifier (logicalChannelIdentity), an SRB identifier (srb-Idendity) or DRB identifier (drb-Identity) associated with the RLC bearer, an indicator indicating whether the RLC should be reestablished (reestablishRLC), RLC configuration information (rlc-Config), or MAC-LogicalChannelConfig containing logical channel information.

[0274] * List of RLC bearer configuration information to be released (rlc-BearerToReleaseList): May include one or more logicalChannelIdentities associated with the RLC bearer to be released.

[0275] MAC Cell Group Configuration Information (mac-CellGroupConfig)

[0276] * PHYSICAL cell group configuration information (physical-CellGroupConfig)

[0277] Configuration information for SpCell (spCellConfig): spCellConfig may include an index (servCellIndex) that can identify the SpCell (meaning Primary Cell (PCell) of MCG or Primary SCG Cell (PSCell) of SCG), parameters for synchronous reconfiguration in the target SpCell (reconfigurationWithSync), information on whether to set or disable parameters containing timer values ​​and constant values ​​for detecting and triggering cell-level wireless link failure (rlf-TimerAndConstants), rlmInSyncOutOfSyncThreshold, or spCellConfigDedicated.

[0278] List of SCell setting information to add or modify (sCellToAddModList)

[0279] * List of SCell settings to be released (sCellToReleaseList)

[0280] * Measurement configuration information (measConfig)

[0281] * Master Key configuration information to update (masterKeyUpdate): masterKeyUpdate may include keySetChangeIndicator, nextHopChainingCount, or nas-Container. masterKeyUpdate must always be included when an RRC connection reconfiguration procedure is performed due to a handover that requires changing the security algorithm, and may be optionally included if ReconfigurationWithSync is included in other cases.

[0282] The above message may additionally include dedicatedNAS-MessageList, dedicatedSIB1-Delivery, dedicatedSystemInformationDelivery, or otherConfig. A terminal that receives an RRC connection reconfiguration message may apply the above information and then send an RRC connection reconfiguration complete message (RRCReconfigurationComplete message) to the base station (1g-50).

[0283] FIG. 1h is a diagram illustrating a method in which a terminal supporting a low-power wake-up receiver in a wireless communication system according to one embodiment of the present disclosure performs an RRC connection establishment procedure or an RRC connection resume procedure.

[0284] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR. For convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used to refer to a frequency where NR signals / channels are provided separately from low-power wake-up signals / channels, and the term LR frequency is used to refer to a frequency where signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR and perform a Random Access procedure on that cell. By receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR, a power saving effect can be obtained.For reference, a given cell may be operated simultaneously at MR and LR frequencies, may be operated only at MR frequencies, or may be operated only at LR frequencies.

[0285] Referring to FIG. 1h, the terminal (1h-01) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station (1h-05) (1h-10).

[0286] In step 1h-15, the base station (1h-05) may send a terminal capability report request message (UECapabilityEnquiry) to the terminal (1h-01) to retrieve terminal radio access capability information (UE radio access capability information).

[0287] In step 1h-20, the terminal (1h-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (1h-05). According to one embodiment of the present disclosure, the message may include at least one of the following information.

[0288] - Information indicating the ability of the above terminal to perform an RRC connection establishment or RRC connection resume procedure by determining a specific MR frequency as the highest reselection priority, performing a cell reselection procedure, and triggering or initiating a Random Access procedure in the reselected cell, without immediately triggering or initiating the Random Access procedure, when a Random Access procedure is triggered to perform an RRC connection establishment or RRC connection resume procedure in a currently serving cell operating on MR and LR frequencies (e.g., upon receiving a paging message containing a PagingUE-Identity indicating the terminal).

[0289] The above-mentioned predetermined MR frequency may be broadcast to the terminal through system information broadcast by the serving cell or set as an RRC disconnection message (RRCRelease).

[0290] - Information indicating the ability of the above terminal to apply a new parameter broadcast by the base station (e.g., an indicator to apply TreselectionNR-LP-WUS or TreselectionNR as 0 (or a predetermined fixed integer value)) so as to enable rapid cell reselection when performing the cell reselection described above.

[0291] The above new parameter may mean at least one of the following.

[0292] ◆ New TreselectionNR-LP-WUS parameters broadcasting by NR frequency

[0293] ● The above TreselectionNR-LP-WUS is a parameter that enables the terminal to quickly reselect a cell by applying TreselectionNR-LP-WUS instead of applying TreselectionNR of the above embodiment (1e) when the terminal performs a cell reselection procedure without immediately triggering or initiating a random access procedure, thereby evaluating cell reselection criteria.

[0294] ◆ Indicator to apply 0 (or a specified fixed integer value) to TreselectionNR for each NR frequency

[0295] ● The above indicator is an indicator that allows the terminal to quickly reselect a cell by applying 0 (or a predetermined fixed integer value) instead of the TreselectionNR of the above embodiment (1e) when the terminal performs a cell reselection procedure without immediately triggering or initiating a random access procedure, thereby evaluating cell reselection criteria.

[0296] For reference, each of the aforementioned terminal capability parameters can be signaled to the base station separately for each capability, or can be signaled to the base station as a single capability parameter.

[0297] In step 1h-25, the terminal (1h-01) may receive an RRC disconnection message (RRCRelease) from the base station (1h-05). The information included in the message may follow the previously described embodiment (1e). The message according to one embodiment of the present disclosure may include at least one of the following information.

[0298] - An indicator to trigger or initiate the random access procedure in the cell re-selected via the cell re-selection procedure, rather than immediately triggering or initiating it, when the random access procedure is triggered to perform the procedure for establishing an RRC connection or resuming the RRC connection (e.g., upon receiving a paging message containing a paging terminal identifier (PagingUE-Identity) indicating the terminal).

[0299] The above cell reselection procedure may mean determining a specific MR frequency broadcast in system information or set in an RRC disconnection message as the highest cell reselection priority and performing the procedure.

[0300] - When a random access procedure is triggered to perform an RRC connection establishment or RRC connection resumption procedure (e.g., upon receipt of a paging message containing a paging terminal identifier (PagingUE-Identity) indicating the terminal), a predetermined MR frequency for reselecting the cell to trigger or initiate the random access procedure.

[0301] The above terminal can be determined as having the highest cell reselection priority during the cell reselection procedure for the above predetermined MR frequency.

[0302] - New TreselectionNR-LP-WUS Parameters by NR Frequency

[0303] The above TreselectionNR-LP-WUS is a parameter that can be used to evaluate cell reselection criteria by applying the above TreselectionNR-LP-WUS instead of applying the TreselectionNR-- of the above embodiment (1e) when the terminal performs cell reselection by triggering a random access procedure. That is, it is a parameter to enable the terminal to quickly reselect a cell, and TreselectionNR-LP-WUS can be signaled as a predetermined integer value.

[0304] The above TreselectionNR-LP-WUS is a parameter set for each NR frequency, and each NR frequency can be mapped to a predetermined MR frequency. Of course, TreselectionNR-LP-WUS can also be set so that it can be applied commonly to one or more NR frequencies.

[0305] - Indicator to apply 0 (or a specified fixed integer value) to TreselectionNR per NR frequency

[0306] * The above indicator may instruct the terminal to evaluate cell reselection criteria by applying 0 (or a predetermined fixed integer value) instead of applying the TreselectionNR-- of the above embodiment (1e) when the random access procedure is triggered and cell reselection is performed.

[0307] The above indicator may be set per NR frequency or may be set to be applied commonly to one or more NR frequencies. For reference, the NR frequency may be mapped to a predetermined MR frequency.

[0308] - New timer value

[0309] The above timer value may represent a value that determines how much the above-described parameters are applied. That is, when the new timer value is set, the terminal drives the timer with that value, and when at least one of the above-described parameters is set while the timer is running, it can apply it.

[0310] In step 1h-30, the terminal (1h-01) can apply the received RRC disconnection message and transition to RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE).

[0311] In step 1h-35, the terminal (1h-01) in RRC idle mode or RRC disabled mode may perform a cell selection procedure to camp-on to an NR suitable cell (1h-05). This may follow the previously described embodiment (1e). The cell according to the present disclosure may be operated at MR and LR frequencies. That is, the cell may transmit low-power wake-up signals (hereinafter LP-WUS) and may transmit and receive NR signals separate from the low-power wake-ups.

[0312] In step 1h-40, the terminal (1h-01) may obtain system information containing cell reselection information (e.g., SIB2, SIB3, SIB4, SIB5, etc.) from the serving cell (1h-05) to perform a cell reselection evaluation procedure. This may follow the previously described embodiment (1e). In the system information according to one embodiment of the present disclosure, when a random access procedure is triggered for the terminal (1h-01) to establish or resume an RRC connection in the current serving cell (1h-05) (e.g., when a paging terminal identifier (PagingUE-Identity) indicating the terminal is received as a paging message), the terminal may broadcast specific MR frequency information to perform cell reselection by considering a specific MR frequency as the highest reselection priority, and then trigger or initiate a random access procedure in the reselected cell to perform an RRC connection establishment procedure or an RRC connection resumption procedure. The terminal may perform a cell reselection evaluation procedure according to the aforementioned embodiment (1e) for the specific MR frequency even before the random access procedure is triggered to establish or resume an RRC connection with the cell (1h-05), or may perform a cell reselection evaluation procedure by applying the highest reselection priority (this is to enable rapid reselection of the cell when the random access procedure is triggered). If the cell reselection evaluation procedure is performed by applying the specific MR frequency with the highest reselection priority, the terminal may not reselect a cell at the specific MR frequency before the random access procedure is triggered. The specific MR frequency information may be broadcast through new system information, or may be broadcast by indicating one of the MR frequencies included in the system information containing existing cell reselection information.Even if the specific MR frequency information is broadcast through the new system information, it may be broadcast at one of the MR frequencies included in the system information containing the existing cell reselection information. For convenience of explanation, the specific MR frequency according to one embodiment of the present disclosure may refer to NR frequency band 2. If a specific MR frequency is set in the RRC disconnection message, the terminal may apply the specific MR frequency set in the RRC disconnection message instead of applying the specific MR frequency included in the system information. In the system information according to one embodiment of the present disclosure, at least one of the following parameters may be broadcast through the system information so that the terminal can quickly reselect a cell when performing the cell reselection evaluation procedure as described above.

[0313] - New TreselectionNR-LP-WUS Parameters by NR Frequency

[0314] * The above TreselectionNR-LP-WUS is a parameter that can be used to evaluate cell reselection criteria by applying the above TreselectionNR-LP-WUS without applying the TreselectionNR-- of the above embodiment (1e) when the terminal performs cell reselection by triggering a random access procedure. That is, it is a parameter to enable the terminal to quickly reselect a cell, and TreselectionNR-LP-WUS can be signaled as a predetermined integer value. Of course, it can also be signaled so that it can be applied together with the above embodiment (1e) TreselectionNR- (e.g., TreselectionNR * TreselectionNR-LP-WUS, in which case TreselectionNR-LP-WUS means a decimal value).

[0315] The above TreselectionNR-LP-WUS is a parameter broadcast for each NR frequency, and each NR frequency can be mapped to a predetermined MR frequency. Of course, TreselectionNR-LP-WUS may also be broadcast so that it can be applied commonly to one or more NR frequencies.

[0316] - Indicator to apply 0 (or a specified fixed integer value) to TreselectionNR per NR frequency

[0317] * The above indicator may instruct the terminal to evaluate cell reselection criteria by applying 0 (or a predetermined fixed integer value) instead of applying the TreselectionNR-- of the above embodiment (1e) when the random access procedure is triggered and cell reselection is performed.

[0318] * The above indicator may be broadcast for each NR frequency or may be broadcast so as to be applied commonly to one or more NR frequencies. For reference, NR frequencies may be mapped to a predetermined MR frequency.

[0319] If an indicator is set in the RRC disconnection message to apply 0 (or a predetermined fixed integer value) to the new TreselectionNR-LP-WUS parameter or TreselectionNR for each NR frequency, the terminal may apply the value set in the RRC disconnection message without applying the indicator to apply 0 (or a predetermined fixed integer value) to the TreselectionNR-LP-WUS parameter or TreselectionNR included in the system information.

[0320] In step 1h-45, the terminal (1h-01) can turn off the MR (1h-02) of the terminal when a predetermined condition is met and use the LR (1h-03) to monitor the low-power wake-up signal (hereinafter LP-WUS) transmitted by the cell (1h-05). The above-mentioned predetermined condition may mean that the signal of the serving cell measured from the MR of the terminal (e.g., RSRP (Reference Signals Received Power) and / or RSRQ (Reference Signal Received Quality)) is greater than or equal to a predetermined threshold broadcast in the system information and / or the signal of the serving cell measured from the LR of the terminal (RSRP and / or RSRP and / or LP-RSRP (Low-Power RSRP) and / or LP-RSRQ (Low-Power RSRQ)) is greater than or equal to a predetermined threshold broadcast in the system information.

[0321] In step 1h-50, the LR (1h-03) of the terminal (1h-01) may receive an LP-WUS transmitted by the cell (1h-05). The LP-WUS may include information for waking up the terminal (1h-01). The LP-WUS may also include information on whether to monitor PEI. The LP-WUS may include an indicator to perform cell reselection by considering a specific MR frequency as the highest reselection priority, and then to initiate or trigger a random access procedure in the reselected cell, even if the random access procedure is triggered for the RRC connection establishment procedure or the RRC connection resumption procedure by the terminal (1h-01), without immediately initiating it. The above LP-WUS may include an instruction to evaluate cell reselection criteria by applying 0 (or a predetermined fixed integer value) instead of applying the TreselectionNR-- of the above embodiment (1e) when performing a cell reselection procedure without immediately initiating the random access procedure for the RRC connection establishment procedure or the RRC connection resumption procedure.

[0322] In step 1h-55, the terminal (1h-01) can monitor the Paging Early Indication (PEI-O) using the terminal's MR (1h-02). Accordingly, the terminal can receive the PEI transmitted by the cell (1h-05) using the terminal's MR (1h-60). Steps 1h-55 and 1h-60 may be omitted (for example, if the LP-WUS contains information on whether to omit PEI-O monitoring or if the terminal does not have information on the ability to monitor PEI-O). The PEI may include an indicator that, even if the random access procedure is triggered for the RRC connection establishment procedure or the RRC connection resumption procedure, the terminal (1h-01) should not immediately initiate it, but instead perform cell reselection by considering a specific MR frequency as the highest reselection priority, and then initiate or trigger the random access procedure in the reselected cell. The above PEI may include instructions to evaluate cell reselection criteria by applying 0 (or a predetermined fixed integer value) instead of applying the TreselectionNR-- of the above embodiment (1e) when performing a cell reselection procedure without immediately initiating the random access procedure for the RRC connection establishment procedure or the RRC connection resumption procedure.

[0323] In step 1h-65, the terminal (1h-01) can monitor the PO (Paging Occasion) using the terminal's MR (1h-02). Accordingly, the terminal can receive (1h-70) a Short Message transmitted by the cell (1h-05) using the terminal's MR. The Short Message may include information regarding whether there is a Paging Message. The Short Message may also include an instruction for the terminal (1h-01) not to immediately initiate a Random Access Procedure even if it is triggered for an RRC connection establishment procedure or an RRC connection resumption procedure, but to perform cell reselection by considering a specific MR frequency as the highest reselection priority, and then initiate or trigger a Random Access Procedure in the reselected cell. The above Short Message may include instructions to evaluate cell reselection criteria by applying 0 (or a predetermined fixed integer value) instead of applying the TreselectionNR-- of the above embodiment (1e) when performing a cell reselection procedure without immediately initiating the random access procedure for the RRC connection establishment procedure or the RRC connection resumption procedure.

[0324] In step 1h-75, the terminal (1h-01) can monitor the paging channel using the terminal's MR (1h-02). Accordingly, the terminal can receive (1h-80) a Paging message transmitted by the cell (1h-05) through the terminal's MR. The Paging message may include the terminal's identifier (PagingUE-Identity). The Paging message may also include an instruction for the terminal (1h-01) to perform cell reselection by considering a specific MR frequency as the highest reselection priority, and then to initiate or trigger the random access procedure in the reselected cell, even if the random access procedure is triggered for the RRC connection establishment procedure or the RRC connection resumption procedure. The above Paging message may include instructions to evaluate cell reselection criteria by applying 0 (or a predetermined fixed integer value) instead of applying the TreselectionNR-- of the above embodiment (1e) when performing a cell reselection procedure without immediately initiating the random access procedure for the RRC connection establishment procedure or the RRC connection resumption procedure.

[0325] In step 1h-81, the terminal (1h-01) may determine that it needs to perform a random access procedure to switch to an RRC connection mode. For example, the terminal may determine that it needs to perform a random access procedure if the paging message received in step 1h-80 contains a paging terminal identifier (PagingUE-Identity) that identifies the terminal, or if there is a reason to perform an RRC connection establishment procedure or an RRC connection resumption procedure with the base station (e.g., when sending mobile originated signaling). For reference, the terminal may not immediately initiate the random access procedure or may not trigger the random access procedure even if it is triggered in step 1h-81.

[0326] In step 1h-85, the terminal (1h-01) may perform a cell reselection procedure through the terminal's MR (1h-02) by considering the NR frequency band 2 received in step 1h-25 or step 1h-40 as the highest reselection priority (of course, if the value is not set, the reselection priority may be applied as in the aforementioned embodiment (1e)). When evaluating the cell reselection evaluation criteria, the terminal may apply 0 (or a predetermined fixed integer value) or TreselectionNR-LP-WUS instead of TreselectionNR of the aforementioned embodiment (1e) if it is set. For reference, the terminal may perform step 1h-80 only due to step 1h-25 and / or (and / or) step 1h-50 and / or (and / or) step 1h-60 and / or (and / or) step 1h-70 and / or (and / or) step 1h-80.

[0327] In step 1h-90, the terminal (1h-01) can re-select an NR cell (1h-06) operating in NR frequency band 2 through step 1h-85.

[0328] In step 1h-95, the terminal (1h-01) may perform a random access procedure and an RRC connection establishment procedure or an RRC connection resumption procedure with the re-selected NR cell (1h-06). This may follow the aforementioned embodiments (1f, 1g).

[0329] FIG. 1i is a diagram illustrating a method in which a terminal supporting a low-power wake-up receiver in a wireless communication system according to one embodiment of the present disclosure selects one of a plurality of cells included in a cell list to perform an RRC connection establishment procedure or an RRC connection resume procedure.

[0330] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR. For convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used to refer to a frequency where NR signals / channels are provided separately from low-power wake-up signals / channels, and the term LR frequency is used to refer to a frequency where signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR and perform a Random Access procedure on that cell. A power saving effect can be obtained by receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR.For reference, a given cell may be operated simultaneously at MR and LR frequencies, may be operated only at MR frequencies, or may be operated only at LR frequencies.

[0331] Referring to FIG. 1i, the terminal (1i-01) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station (1i-05) (1i-10).

[0332] In step 1i-15, the base station (1i-05) may send a terminal capability report request message (UECapabilityEnquiry) to the terminal (1i-01) to retrieve terminal radio access capability information (UE radio access capability information).

[0333] In step 1i-20, the terminal (1i-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (1i-05). The information included in the message may follow the previously described embodiments (1h).

[0334] In step 1i-25, the terminal (1i-01) may receive an RRC disconnection message (RRCRelease) from the base station (1i-05). The information included in the message may follow at least one of the aforementioned embodiments (1e, 1h).

[0335] In step 1i-30, the terminal (1i-01) can apply the received RRC disconnection message and transition to RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE).

[0336] In step 1i-35, the terminal (1i-01) in RRC idle mode or RRC disabled mode may perform a cell selection procedure to camp-on to an NR suitable cell (1i-05). This may follow the previously described embodiment (1e). The cell according to the present disclosure may be operated at MR and LR frequencies. That is, the cell may transmit low-power wake-up signals (hereinafter LP-WUS) and may transmit and receive NR signals separate from the low-power wake-ups.

[0337] In step 1i-40, the terminal (1i-01) may obtain system information containing cell reselection information (e.g., SIB2, SIB3, SIB4, SIB5, new SIB, etc.) from the serving cell (1i-05) to perform a cell reselection evaluation procedure. This may follow at least one of the aforementioned embodiments (1e, 1i). In the system information according to one embodiment of the present disclosure, when a random access procedure is triggered for the terminal (1i-01) to establish or resume an RRC connection in the current serving cell (1i-05) (e.g., when a paging terminal identifier (PagingUE-Identity) indicating the terminal is received as a paging message), the terminal may broadcast specific MR frequency information and a cell list for the specific MR frequency to perform cell reselection by considering the specific MR frequency as the highest reselection priority and then triggering or initiating a random access procedure in the reselected cell to perform an RRC connection establishment procedure or an RRC connection resumption procedure. A cell list for a specific MR frequency may mean at least one of the following.

[0338] - List of neighbor cells with specific cell reselection parameters

[0339] For each surrounding cell, at least one of the following specific cell reselection parameters may be included.

[0340] ◆ Cell identifier Id (physCellId) that can identify a cell

[0341] ◆ At least one of q-RxLevMin (Qrxlevmin), q-RxLevMinOffsetCell (Qrxlevminoffsetcell), q-RxLevMinOffsetCellSUL (QrxlevminoffsetcellSUL), q-OffsetCell (Qoffset-s,n), q-QualMin (Qqualmin), q-QualminOffsetCell (Qqualminoffsetcell), and q-OffsetFreq (Qoffsetfrequency) to be applied to the cell selection criterion corresponding to Equation 1 described above and the cell re-selection criterion corresponding to Equation 2 for deriving the Rank in FIG. 1e

[0342] - List of surrounding cells that can be considered as candidates for cell reselection (allowed cell list as candidates for cell reselection)

[0343] The surrounding cell list can be defined as a cell identifier range (PCI-Range).

[0344] - Excluded cell list as candidates for cell reselection

[0345] The surrounding cell list can be defined as a cell identifier range (PCI-Range).

[0346] For reference, the above-mentioned list of surrounding cells may be signaled by frequency for each PLMN (Public Land Mobile Network). Through this, the terminal can identify cells belonging to the registration area to which the terminal belongs. For a specific MR frequency, if a list of surrounding cells containing specific cell reselection parameters is broadcast, the terminal can easily reselect to the corresponding surrounding cell; if a list of surrounding cells that can be considered as candidates for cell reselection is broadcast, the terminal can reselect only to the corresponding surrounding cell; and if a list of surrounding cells that cannot be considered as candidates for cell reselection is broadcast, the terminal can reselect cells excluding the corresponding surrounding cells. For reference, if one of the above cell lists is not broadcast for a specific MR frequency, the terminal can consider all cells in the specific MR frequency as candidates for cell reselection (Example 1i described above). The terminal may perform a cell reselection evaluation procedure according to the aforementioned embodiment (1e) for the specific MR frequency and surrounding cell list (if configured) even before the random access procedure is triggered to establish or resume an RRC connection with the cell (1i-05), or may perform a cell reselection evaluation procedure by applying the highest reselection priority (this is to enable rapid reselection of the cell when the random access procedure is triggered). If the cell reselection evaluation procedure is performed by applying the specific MR frequency with the highest reselection priority, the terminal may not reselect a cell at the specific MR frequency before the random access procedure is triggered. The specific MR frequency information may be broadcast through new system information, or may be broadcast by indicating one of the MR frequencies included in the system information containing existing cell reselection information.Even if the specific MR frequency information is broadcast through the new system information, it may be broadcast using one of the MR frequencies included in the system information containing the existing cell reselection information. For convenience of explanation, the specific MR frequency according to one embodiment of the present disclosure may refer to NR frequency band 2, and the surrounding cells for the specific MR frequency may refer to NR cell z (1i-06) and NR cell z (1i-07). If a specific MR frequency is set in the RRC disconnection message, the terminal may apply the specific MR frequency set in the RRC disconnection message without applying the specific MR frequency included in the system information. However, if the specific MR frequency broadcast in the system information and the specific MR frequency set in the RRC disconnection message are the same, the terminal may apply the cell list for the specific MR frequency in the system information when it is broadcast. In the system information according to one embodiment of the present disclosure, at least one of the following parameters may be broadcast through the system information so that the terminal can quickly reselect a cell when performing the cell reselection evaluation procedure as described above.

[0347] - New TreselectionNR-LP-WUS Parameters by NR Frequency

[0348] * The above TreselectionNR-LP-WUS is a parameter that can be used to evaluate cell reselection criteria by applying the above TreselectionNR-LP-WUS without applying the TreselectionNR-- of the above embodiment (1e) when the terminal performs cell reselection by triggering a random access procedure. That is, it is a parameter to enable the terminal to quickly reselect a cell, and TreselectionNR-LP-WUS can be signaled as a predetermined integer value. Of course, it can also be signaled so that it can be applied together with the above embodiment (1e) TreselectionNR- (e.g., TreselectionNR * TreselectionNR-LP-WUS, where TreselectionNR-LP-WUS means a decimal value).

[0349] The above TreselectionNR-LP-WUS is a parameter broadcast per NR frequency, and each NR frequency can be mapped to a predetermined MR frequency. Of course, TreselectionNR-LP-WUS may also be broadcast so that it can be applied commonly to one or more NR frequencies.

[0350] - An indicator to apply 0 (or a specified fixed integer value) to TreselectionNR for each NR frequency

[0351] * The above indicator may instruct the terminal to evaluate cell reselection criteria by applying 0 (or a predetermined fixed integer value) instead of applying the TreselectionNR-- of the above embodiment (1e) when the random access procedure is triggered and cell reselection is performed.

[0352] * The above indicator may be broadcast for each NR frequency or may be broadcast so as to be applied commonly to one or more NR frequencies. For reference, NR frequencies may be mapped to a predetermined MR frequency.

[0353] If an indicator is set in the RRC disconnection message to apply 0 (or a predetermined fixed integer value) to the new TreselectionNR-LP-WUS parameter or TreselectionNR for each NR frequency, the terminal may apply the value set in the RRC disconnection message without applying the indicator to apply 0 (or a predetermined fixed integer value) to the TreselectionNR-LP-WUS parameter or TreselectionNR included in the system information.

[0354] In step 1i-45, the terminal (1i-01) can turn off the MR (1i-02) of the terminal when a predetermined condition is satisfied and use the LR (1i-03) to monitor the low-power wake-up signal (hereinafter LP-WUS) transmitted by the cell (1i-05). This may follow the previously described embodiment (1h).

[0355] In step 1i-50, the LR (1i-03) of the terminal (1i-01) can receive the LP-WUS transmitted by the cell (1i-05). This may follow the previously described embodiment (1h).

[0356] In step 1i-55, the terminal (1i-01) can monitor the PEI-O (Paging Early Indication occasion) using the terminal's MR (1i-02). Accordingly, the terminal can receive (1i-60) the PEI transmitted by the cell (1i-05) using the terminal's MR. Steps 1i-55 and 1i-60 may follow the previously described embodiment (1h).

[0357] In step 1i-65, the terminal (1i-01) can monitor the PO (Paging Occasion) using the terminal's MR (1i-02). Accordingly, the terminal can receive (1i-70) a Short Message transmitted by the cell (1i-05) using the terminal's MR. Steps 1i-65 and 1i-70 may follow the aforementioned embodiment (1h).

[0358] In step 1i-75, the terminal (1i-01) can monitor the paging channel using the terminal's MR (1i-02). Accordingly, the terminal can receive (1i-80) a Paging message transmitted by the cell (1i-05) through the terminal's MR. Steps 1i-75 and 1i-80 may follow the previously described embodiment (1h).

[0359] In step 1i-81, the terminal (1i-01) may determine that it needs to perform a random access procedure to switch to an RRC connection mode. For example, the terminal may determine that it needs to perform a random access procedure if the paging message received in step 1i-80 contains a paging terminal identifier (PagingUE-Identity) that identifies the terminal, or if there is a reason to perform an RRC connection establishment procedure or an RRC connection resumption procedure with a base station (e.g., when sending mobile originated signaling). For reference, the terminal may not immediately initiate the random access procedure or may not trigger the random access procedure even if it is triggered in step 1i-81.

[0360] In step 1i-85, the terminal (1i-01) may perform a cell reselection procedure through the terminal's MR (1h-02) by considering the NR frequency band 2 received in step 1i-25 or step 1i-40 as the highest reselection priority (of course, if the value is not set, the reselection priority may be applied as in the previously described embodiment (1e)). When evaluating the cell reselection evaluation criteria, the terminal may apply 0 (or a predetermined fixed integer value) or TreselectionNR-LP-WUS instead of TreselectionNR of the previously described embodiment (1e) if the criteria are set. According to one embodiment of the present disclosure, the terminal may perform a cell reselection procedure by applying the above-described content in step 1i-40 when a cell list (1i-06, 1i-07) for NR frequency band 2 is broadcast.

[0361] In step 1i-90, the terminal (1i-01) can re-select an NR cell (1i-06) operating in NR frequency band 2 through step 1i-85.

[0362] In step 1i-95, the terminal (1i-01) may perform a random access procedure and an RRC connection establishment procedure or an RRC connection resumption procedure with the re-selected NR cell (1i-06). This may follow the aforementioned embodiments (1f, 1g).

[0363] FIGS. 1ja and FIGS. 1jb are drawings illustrating a method in which a terminal supporting a low-power wake-up receiver in a wireless communication system according to one embodiment of the present disclosure selects one of a cell within a plurality of frequency bands to perform an RRC connection establishment procedure or an RRC connection resume procedure.

[0364] The procedures disclosed in FIG. 1ja and FIG. 1jb are consecutive procedures performed by the same subject.

[0365] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR. For convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used to refer to a frequency where NR signals / channels are provided separately from low-power wake-up signals / channels, and the term LR frequency is used to refer to a frequency where signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR and perform a Random Access procedure on that cell. By receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR, a power saving effect can be obtained.For reference, a given cell may be operated simultaneously at MR and LR frequencies, may be operated only at MR frequencies, or may be operated only at LR frequencies.

[0366] Referring to FIG. 1j, the terminal (1j-01) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station (1j-05) (1j-10).

[0367] In step 1j-15, the base station (1j-05) may send a terminal capability report request message (UECapabilityEnquiry) to the terminal (1j-01) to retrieve terminal radio access capability information (UE radio access capability information).

[0368] In step 1j-20, the terminal (1j-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (1j-05). The information included in the message may follow at least one of the aforementioned embodiments (1h, 1i). The message according to one embodiment of the present disclosure may include at least one of the following information.

[0369] - Information indicating the ability of the above terminal to perform an RRC connection establishment or RRC connection resume procedure by triggering a random access procedure to perform an RRC connection resume procedure in a currently serving cell operating on MR and LR frequencies when a random access procedure is triggered to perform an RRC connection establishment or RRC connection resume procedure (e.g., upon receiving a paging message containing a PagingUE-Identity indicating the terminal), by applying a frequency-specific cell reselection priority for certain MR frequencies, performing a cell reselection procedure, and triggering or initiating a random access procedure in the reselected cell, without immediately triggering or initiating the random access procedure.

[0370] The above predetermined MR frequencies and cell reselection priority values ​​for each MR frequency may be broadcast to the terminal through system information broadcast by the serving cell or set as an RRC disconnection message (RRCRelease).

[0371] In step 1j-25, the terminal (1j-01) may receive an RRC disconnection message (RRCRelease) from the base station (1j-05). The information included in the message may follow at least one of the previously described embodiments (1e, 1h, 1i). The message according to one embodiment of the present disclosure may include at least one of the following information.

[0372] - An indicator to trigger or initiate the random access procedure in the cell re-selected via the cell re-selection procedure, rather than immediately triggering or initiating it, when the random access procedure is triggered to perform the procedure for establishing an RRC connection or resuming the RRC connection (e.g., upon receiving a paging message containing a paging terminal identifier (PagingUE-Identity) indicating the terminal).

[0373] The above cell reselection procedure may mean performing the procedure by applying the specified MR frequencies broadcast in the system information or the reselection priority values ​​for each MR frequency set in the RRC disconnection message.

[0374] - When a random access procedure is triggered to perform an RRC connection establishment or RRC connection resumption procedure (e.g., upon receipt of a paging message containing a paging terminal identifier (PagingUE-Identity) indicating the terminal), predetermined MR frequencies and reselection priority values ​​per MR frequency for reselecting the cell to trigger or initiate the random access procedure.

[0375] * The predetermined MR frequencies and the re-selection priority values ​​for each MR frequency may follow the above-described embodiment (1e).

[0376] - New timer value

[0377] The above timer value may represent a value that determines how much the indicator and / or (and / or) the predetermined MR frequencies and the reselection priority value for each frequency are applied. That is, when the new timer value is set, the terminal may drive the timer with that value and, while the timer is running, apply the indicator and / or the predetermined MR frequencies and the reselection priority value for each frequency to perform the operation described above. For reference, the above timer value may be set together with the indicator and / or the predetermined MR frequencies and the reselection priority value for each frequency, or only the above timer value may be set. Even if only the above timer value is set, the operation of the terminal may be the same.

[0378] In step 1j-30, the terminal (1j-01) can apply the received RRC disconnection message and transition to RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE).

[0379] In step 1j-35, the terminal (1j-01) in RRC idle mode or RRC disabled mode can perform a cell selection procedure to camp-on to an NR suitable cell (1j-05). This may follow the previously described embodiment (1e). The cell according to the present disclosure may be operated at MR and LR frequencies. That is, the cell may transmit low-power wake-up signals (hereinafter LP-WUS) and may transmit and receive NR signals separate from the low-power wake-ups.

[0380] In step 1j-40, the terminal (1j-01) may obtain system information containing cell reselection information (e.g., SIB2, SIB3, SIB4, SIB5, new SIB, etc.) from the serving cell (1j-05) to perform a cell reselection evaluation procedure. This may follow at least one of the aforementioned embodiments (1e, 1h, 1i). In the system information according to one embodiment of the present disclosure, when a random access procedure is triggered for the terminal (1j-01) to establish or resume an RRC connection in the current serving cell (1j-05) (e.g., when a paging terminal identifier (PagingUE-Identity) indicating the terminal is received as a paging message), information on specific MR frequencies and a reselection priority value per MR frequency may be broadcast to perform cell reselection by applying a reselection priority value per MR frequency to specific MR frequencies, and then trigger or initiate a random access procedure in the reselected cell to perform an RRC connection establishment procedure or an RRC connection resumption procedure. For example,

[0381] The reselection priority value by MR frequency may refer to the cell reselection priority setting information of the aforementioned embodiment (1e). The information on specific MR frequencies and the reselection priority value by MR frequency may be broadcast through new system information, or may be broadcast by including a separate reselection priority value for one of the MR frequencies included in the system information containing existing cell reselection information. For convenience of explanation, the specific MR frequencies according to one embodiment of the present disclosure may refer to NR frequency band 2 and NR frequency band 3, the surrounding cells for NR frequency band 2 may refer to NR cell y (1j-06) and NR cell z (1j-07), and the surrounding cells for NR frequency band 3 may refer to NR cell a (1j-08) and NR cell b (1j-09). If a specific MR frequency is set in the RRC disconnection message, the terminal may apply the specific MR frequency set in the RRC disconnection message without applying the specific MR frequency included in the system information. However, if the specific MR frequency broadcast in the system information and the specific MR frequency set in the RRC disconnection message are the same, the terminal may apply the cell list for the specific MR frequency in the system information when it is broadcast.

[0382] In step 1j-45, the terminal (1j-01) may turn off the MR (1j-02) of the terminal when a predetermined condition is satisfied and use the LR (1j-03) to monitor the low-power wake-up signal (hereinafter LP-WUS) transmitted by the cell (1j-05). This may follow at least one of the previously described embodiments (1h, 1i).

[0383] In step 1j-50, the LR (1j-03) of the terminal (1j-01) can receive the LP-WUS transmitted by the cell (1j-05). This may follow the previously described embodiment (1i).

[0384] In step 1j-55, the terminal (1j-01) can monitor the PEI-O (Paging Early Indication occasion) using the terminal's MR (1j-02). Accordingly, the terminal can receive (1j-60) the PEI transmitted by the cell (1j-05) using the terminal's MR. Steps 1j-55 and 1j-60 may follow at least one of the aforementioned embodiments (1h, 1i).

[0385] In step 1j-65, the terminal (1j-01) can monitor the PO (Paging Occasion) using the terminal's MR (1j-02). Accordingly, the terminal can receive (1j-70) a Short Message transmitted by the cell (1j-05) using the terminal's MR. Steps 1j-65 and 1j-70 may follow at least one of the aforementioned embodiments (1h, 1i).

[0386] In step 1j-75, the terminal (1j-01) can monitor the paging channel using the terminal's MR (1j-02). Accordingly, the terminal can receive (1j-80) a Paging message transmitted by the cell (1j-05) through the terminal's MR. Steps 1j-75 and 1j-80 may follow at least one of the aforementioned embodiments (1h, 1i).

[0387] In step 1j-81, the terminal (1j-01) may determine that it needs to perform a random access procedure to switch to an RRC connection mode. For example, the terminal may determine that it needs to perform a random access procedure if the paging message received in step 1j-80 contains a paging terminal identifier (PagingUE-Identity) that identifies the terminal, or if there is a reason to perform an RRC connection establishment procedure or an RRC connection resumption procedure with a base station (e.g., when mobile originated signaling needs to be sent). For reference, the terminal may not immediately initiate the random access procedure or may not trigger the random access procedure even if it is triggered in step 1j-81.

[0388] In step 1j-85, the terminal (1j-01) can perform a cell reselection procedure through the terminal's MR (1j-02) by applying a reselection priority value for each frequency to NR frequency band 2 and NR frequency band 3 received in step 1j-25 or step 1j-40 (of course, if the reselection priority value is not set, a reselection priority value may be applied as in the aforementioned embodiment (1e)). When evaluating the cell reselection evaluation criteria, the terminal may apply 0 (or a predetermined fixed integer value) or TreselectionNR-LP-WUS instead of TreselectionNR of the aforementioned embodiment (1e) if it is set. According to one embodiment of the present disclosure, the terminal may perform a cell re-selection procedure by applying the above-described content in step 1j-40 when a cell list (1j-06, 1j-07) for NR frequency band 2 and / or a cell list (1j-08, 1j-09) for NR frequency band 3 is broadcast.

[0389] In step 1j-90, the terminal (1j-01) can re-select an NR cell (1j-06) operating in NR frequency band 2 through step 1j-85.

[0390] In step 1j-95, the terminal (1j-01) may perform a random access procedure and an RRC connection establishment procedure or an RRC connection resumption procedure with the re-selected NR cell (1j-06). This may follow the aforementioned embodiments (1f, 1g).

[0391] FIGS. 1ka and FIGS. 1kb are drawings illustrating a method for a terminal supporting a low-power wake-up receiver in a wireless communication system according to one embodiment of the present disclosure to perform a random access procedure upon receiving a low-power wake-up signal (hereinafter LP-WUS) corresponding to itself.

[0392] The procedures disclosed in FIG. 1ka and FIG. 1kb are consecutive procedures performed by the same subject.

[0393] A terminal according to one embodiment of the present disclosure may perform a predetermined operation by being equipped with a Main Radio (hereinafter MR) and a Low Power Wake-Up Receiver (hereinafter LR). The MR installed in the terminal refers to a transceiver module (Tx / Rx module operating for NR signals / channels apart from signals / channels related to low-power wake-up) that operates for NR signals / channels separate from low-power wake-up signals / channels, and the LR additionally installed in the terminal may refer to a receiver module (Rx module operating for receiving / processing signals / channels related to low-power wake-up) that operates to receive or process signals / channels related to low-power wake-up. Since the power consumed when using the LR is less than that of the MR, the terminal may achieve a power saving effect by turning off the MR and using the LR under predetermined conditions, or by having the LR perform measurements instead of the MR. For convenience of explanation, in one embodiment of the present disclosure, the term MR frequency is used to refer to a frequency where NR signals / channels are provided separately from low-power wake-up signals / channels, and the term LR frequency is used to refer to a frequency where signals / channels related to low-power wake-up are provided. For example, a terminal can select or re-select a cell operating at the MR frequency through the terminal's MR and perform a Random Access procedure on that cell. By receiving signals / channels related to low-power wake-up from a cell operating at the LR frequency through the terminal's LR, a power saving effect can be obtained.For reference, a given cell may be operated simultaneously at MR and LR frequencies, may be operated only at MR frequencies, or may be operated only at LR frequencies.

[0394] Referring to Fig. 1k, the terminal (1k-01) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station (1k-05) (1k-10).

[0395] In step 1k-15, the base station (1k-05) may send a terminal capability report request message (UECapabilityEnquiry) to the terminal (1k-01) to retrieve terminal radio access capability information (UE radio access capability information).

[0396] In step 1k-20, the terminal (1k-01) may transmit a terminal capability information message (UECapabilityInformation) to the base station (1k-05). According to one embodiment of the present disclosure, the message may include capability information that enables a cell reselection evaluation procedure to be performed by applying a new reselection parameter. For example, the message may include at least one of the following information.

[0397] - Information indicating the ability of the above terminal to reselect a cell by applying a predetermined cell reselection priority by MR frequency upon receiving an LP-WUS that wakes up the terminal in the current serving cell.

[0398] - Information indicating the ability of the terminal to apply a new parameter broadcast by the base station (e.g., an indicator to apply TreselectionNR-LP-WUS or TreselectionNR to 0 (or a predetermined fixed integer value)) upon receiving an LP-WUS that wakes the terminal in the current serving cell.

[0399] For reference, each of the aforementioned terminal capability parameters can be signaled to the base station separately for each capability, or can be signaled to the base station as a single capability parameter.

[0400] In step 1k-25, the terminal (1k-01) may receive an RRC disconnection message (RRCRelease) from the base station (1k-05). The information included in the message may follow at least one of the previously described embodiments (1e, 1h, 1i). The message according to one embodiment of the present disclosure may include at least one of the following information.

[0401] - An indicator to perform a cell reselection procedure by determining a predetermined MR frequency broadcast in the system information as the highest cell reselection priority upon receiving an LP-WUS that wakes up the above terminal

[0402] - An indicator to perform a cell reselection procedure by applying the predetermined MR frequencies broadcast in the system information and the reselection priority values ​​for each MR frequency upon receiving an LP-WUS that wakes up the above terminal

[0403] - A predetermined MR frequency to perform the cell reselection procedure by determining the highest cell reselection priority upon receiving an LP-WUS that wakes up the above terminal.

[0404] - When an LP-WUS is received to wake the above terminal, predetermined MR frequencies to which frequency-specific cell reselection priority is to be applied, and MR frequency-specific reselection priority values

[0405] - An indicator to apply 0 (or a predetermined fixed integer value) to the new TreselectionNR-LP-WUS parameter or the TreselectionNR parameter broadcast in the system information for each NR frequency when receiving LP-WUS to wake the above terminal and performing the cell reselection evaluation procedure.

[0406] - New TreselectionNR-LP-WUS parameters to be applied per NR frequency when performing the cell reselection evaluation procedure upon receiving an LP-WUS that wakes up the above terminal

[0407] - New timer value

[0408] The above timer value may represent a value that determines how much the above-described parameters are applied. That is, when the new timer value is set, the terminal can drive the timer with that value, and when an LP-WUS that wakes the terminal is received while the timer is running, it can apply at least one of the above-described parameters to perform a cell reselection evaluation procedure.

[0409] In step 1k-30, the terminal (1k-01) can apply the received RRC disconnection message and transition to RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE).

[0410] In step 1k-35, the terminal (1k-01) in RRC idle mode or RRC disabled mode can perform a cell selection procedure to camp-on to an NR suitable cell (1k-05). This may follow the previously described embodiment (1e). The cell according to the present disclosure may be operated at MR and LR frequencies. That is, the cell may transmit low-power wake-up signals (hereinafter LP-WUS) and may transmit and receive NR signals separate from the low-power wake-ups.

[0411] In step 1k-40, the terminal (1k-01) may obtain system information containing cell reselection information (e.g., SIB2, SIB3, SIB4, SIB5, new SIB, etc.) from the serving cell (1k-05) to perform a cell reselection evaluation procedure. This may follow at least one of the aforementioned embodiments (1e, 1h, 1i, 1j). In the system information according to one embodiment of the present disclosure, new cell reselection parameters may be broadcast upon receiving an LP-WUS that wakes up the terminal (1k-01) from the current serving cell (1k-05). For example, at least one of the following new cell reselection parameters may be broadcast as system information.

[0412] - A predetermined MR frequency to perform the cell reselection procedure by determining the highest cell reselection priority upon receiving an LP-WUS that wakes up the above terminal.

[0413] * A cell list mapped to the above-mentioned MR frequency may also be optionally broadcast. The cell list may follow the above-mentioned embodiment (1i).

[0414] - Specific MR frequencies to which new reselection priority values ​​are to be applied upon reception of LP-WUS waking the above terminal, and reselection priority values ​​per MR frequency

[0415] The cell list mapped to the specific MR frequency above may also be optionally broadcast. The cell list may follow the aforementioned embodiment (1i).

[0416] - New TreselectionNR-LP-WUS parameters per NR frequency upon receiving LP-WUS that wakes up the above terminal

[0417] The above TreselectionNR-LP-WUS is a parameter that can be used when a terminal evaluates cell reselection criteria by applying the above TreselectionNR-LP-WUS without applying the TreselectionNR-- of the above embodiment (1e). That is, it is a parameter to enable the terminal to quickly reselect a cell, and TreselectionNR-LP-WUS can be signaled as a predetermined integer value.

[0418] - An indicator to apply 0 (or a predetermined fixed integer value) to TreselectionNR for each NR frequency upon receiving an LP-WUS that wakes up the above terminal

[0419] The above indicator is an indicator that, upon receiving an LP-WUS that wakes the terminal, it evaluates cell reselection criteria by applying 0 (or a predetermined fixed integer value) instead of applying the TreselectionNR-- of the aforementioned embodiment (1e). The above indicator may be set per NR frequency or may be set to be applied commonly to one or more NR frequencies.

[0420] For convenience of explanation, the specific MR frequencies according to one embodiment of the present disclosure may refer to NR frequency band 2 and NR frequency band 3, the surrounding cells for NR frequency band 2 may refer to NR cell y (1k-06) and NR cell z (1k-07), and the surrounding cells for NR frequency band 3 may refer to NR cell a (1k-08) and NR cell b (1k-09). If a specific MR frequency is set in an RRC disconnection message, the terminal may apply the specific MR frequency set in the RRC disconnection message without applying the specific MR frequency included in the system information. However, if the specific MR frequency broadcast in the system information and the specific MR frequency set in the RRC disconnection message are the same, the terminal may apply the cell list for the specific MR frequency in the system information when it is broadcast.

[0421] In step 1k-45, the terminal (1k-01) can turn off the MR (1k-02) of the terminal when a predetermined condition is satisfied and use the LR (1k-03) to monitor the low-power wake-up signal (hereinafter LP-WUS) transmitted by the cell (1k-05). This may follow the previously described embodiment (1h).

[0422] In step 1k-50, the LR (1k-03) of the terminal (1k-01) can receive the LP-WUS transmitted by the cell (1k-05). The LP-WUS can wake up the terminal. The LP-WUS may include at least one of the new cell reselection parameters described above in step 1k-40 when performing the cell reselection procedure.

[0423] In step 1k-55, the terminal (1k-01) can perform a cell reselection procedure through the terminal's MR (1k-02) by applying a reselection priority value for each frequency to NR frequency band 2 and NR frequency band 3 received in step 1k-25, step 1k-40, or step 1k-50 (of course, if the reselection priority value is not set, the reselection priority value may be applied as in the aforementioned embodiment (1e)). When evaluating the cell reselection evaluation criteria, if set, the terminal may apply 0 (or a predetermined fixed integer value) or TreselectionNR-LP-WUS instead of TreselectionNR of the aforementioned embodiment (1e). According to one embodiment of the present disclosure, the terminal may perform a cell re-selection procedure by applying the above-described content in step 1k-40 when a cell list (1k-06, 1k-07) for NR frequency band 2 and / or a cell list (1k-08, 1k-09) for NR frequency band 3 is broadcast.

[0424] In step 1k-60, the terminal (1k-01) can re-select an NR cell (1k-06) operating in NR frequency band 2 through step 1k-55.

[0425] In step 1k-65, the terminal (1k-01) can monitor the PEI-O (Paging Early Indication occasion) using the terminal's MR (1k-02). Accordingly, the terminal can receive the PEI transmitted by the cell (1k-06) using the terminal's MR (1k-70).

[0426] In step 1k-75, the terminal (1k-01) can monitor the PO (Paging Occasion) using the terminal's MR (1k-02). Accordingly, the terminal can receive (1k-80) a Short Message transmitted by the cell (1k-06) using the terminal's MR.

[0427] In step 1k-85, the terminal (1k-01) can monitor the paging channel using the terminal's MR (1k-02). Accordingly, the terminal can receive (1k-90) a Paging message transmitted by the cell (1k-06) through the terminal's MR.

[0428] In step 1k-95, the terminal (1k-01) may determine that it needs to perform a random access procedure to switch to an RRC connection mode. For example, the terminal may determine that it needs to perform a random access procedure if the paging message received in step 1k-90 contains a paging terminal identifier (PagingUE-Identity) identifying the terminal, or if there is a reason to perform an RRC connection establishment procedure or an RRC connection resumption procedure with the base station (e.g., when mobile originated signaling needs to be sent). Accordingly, the terminal (1k-01) may perform a random access procedure and an RRC connection establishment procedure or an RRC connection resumption procedure with the re-selected NR cell (1k-06). This may follow the aforementioned embodiments (1f, 1g).

[0429] FIG. 11 is a flowchart illustrating how a terminal (Multi-USIM UE, hereinafter MUSIM UE) supporting a plurality of USIMs (Universal Subscriber Identity Module, hereinafter USIM) in one embodiment of the present disclosure processes conflicting MUSIM gaps.

[0430] A MUSIM terminal (1l-01) according to one embodiment of the present disclosure may refer to a terminal that supports two or more USIMs. For convenience of explanation, the present disclosure considers a Dual-USIM terminal that supports two USIMs. The Dual-USIM terminal has the characteristic of transmitting to a base station associated with one USIM or to a base station associated with each USIM at a given time. Likewise, the Dual-USIM terminal has the characteristic of receiving from a base station associated with one USIM or receiving simultaneously from base stations associated with each USIM at a given time.

[0431] Referring to FIG. 11, a MUSIM terminal (1l-01) may refer to a terminal that supports multiple USIMs in a single device. For example, the MUSIM terminal may refer to a USIM 1 terminal (1l-02) when operating on USIM 1, and a USIM 2 terminal (1l-03) when operating on USIM 2. A base station associated with each USIM may recognize each USIM terminal as a single terminal. For example, base station 1 (1l-04) may recognize the USIM 1 terminal (1l-02) as a single terminal, and base station 2 (1l-05) may recognize the USIM 2 terminal (1l-03) as a single terminal. For convenience of explanation in the embodiments of the present disclosure below, when communication is performed using USIM 1 at a MUSIM terminal, the MUSIM terminal is referred to as a USIM 1 terminal, and when communication is performed using USIM 2 at the MUSIM terminal, the MUSIM terminal is referred to as a USIM 2 terminal. That is, the MUSIM terminal can be a USIM 1 terminal or a USIM 2 terminal depending on which USIM, USIM 1 or USIM 2, is used.

[0432] In step 1l-10, the USIM 1 terminal (1l-02) may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with base station 1 (1l-04). On the other hand, at this time, the USIM 2 terminal (1l-03) may be in an RRC idle mode (RRC_IDLE) or RRC inactive mode (RRC_INACTIVE) by not establishing an RRC connection with base station 2 (1l-05) (1l-10). Of course, the contents of the present disclosure may apply equally even if the USIM 2 terminal (1l-03) is in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with base station 2 (1l-05).

[0433] In step 1l-15, the USIM 1 terminal (1l-02) can transmit a terminal capability information message (UECapabilityInformation) to base station 1 (1l-04).

[0434] - musim-GapPreference

[0435] The above field indicates whether the UE supports providing MUSIM assistance information with MUSIM gap preference and related MUSIM gap configuration, as defined in TS 38.331. A UE supporting this feature can support three periodic gaps and one aperiodic gap.

[0436] - musim-GapPriorityPreference

[0437] The above field indicates whether the UE supports providing MUSIM assistance information with periodic MUSIM gap priority preference and related periodic MUSIM gap priority configuration, and its preference of keeping all collided MUSIM gaps, as defined in TS 38.331. A UE supporting this feature shall support musim-GapPreference.

[0438] In step 1l-20, base station 1 (1l-04) may transmit otherConfig containing musim-GapAssistanceConfig and musim-GapPriorityAssistanceConfig to USIM 1 terminal (1l-02). For reference, otherConfig may be transmitted to the terminal via a predetermined RRC message (e.g., RRCReconfiguration). Upon receiving this, the terminal may perform the following operations.

[0439] - If musim-GapAssistanceConfig is set to setup

[0440] The above terminal may be considered to be configured to provide MUSIM assistance information for gap preference to the base station.

[0441] - Otherwise (e.g., if musim-GapAssistanceConfig is set to release)

[0442] The above terminal may be considered not to be configured to provide MUSIM assistance information for gap preference to the base station and may stop the T346h timer if it is running.

[0443] - If musim-GapPriorityAssistanceConfig is set to setup

[0444] The above terminal may be considered to be configured to provide MUSIM assistance information for gap(b) priority to the base station.

[0445] - Otherwise (e.g., if musim-GapPriorityAssistanceConfig is set to release)

[0446] The above terminal may be considered not to be configured to provide MUSIM assistance information for gap(s) priority to the base station.

[0447] For reference, the descriptions of the above musim-GapAssistanceConfig and musim-GapPriorityAssistanceConfig and Abstract Syntax Notation.One (ASN.1) are as follows.

[0448]

[0449]

[0450]

[0451] In step 1l-25, the USIM 2 terminal (1l-03) can notify the USIM 1 terminal (1l-02) of information necessary to perform operations required in RRC idle mode or RRC disabled mode (e.g., cell reselection, receiving system information, frequency measurement, etc.) (e.g., one or more MUSIM gap setting information).

[0452] In step 1l-30, the USIM 1 terminal (1l-02) may initiate the transmission of a Terminal Assistance Information (UEAssistanceInformation) message to provide the current musim-GapPreferenceList and / or (and / or) musim-GapPriorityPreferenceList and / or musim-GapKeepPreference to base station 1 (1l-04). Specifically, the USIM 1 terminal may initiate a Terminal Assistance Information procedure if at least one of the following conditions is satisfied.

[0453] - Condition 1: If configured to provide MUSIM assistance information for gap preference

[0454] If configured to provide MUSIM assistance information for gap priority preference

[0455] ◆ If the T346h timer is not running and the USIM 1 terminal has a preference on the MUSIM gap(s) and has not transmitted a UEAssistanceInformation message containing musim-GapPreferenceList and / or musim-GapPriorityPreferenceList and / or musim-GapKeepPreference since it was configured to provide MUSIM assistance information for gap preference and gap priority preference and the timer T346h is not running, or

[0456] ◆ If the T346h timer is not running and the current musim-GapPreferenceList and / or musim-GapPriorityPreferenceList and / or musim-GapKeepPreference is different from the one indicated in the last transmission of the UEAssistanceInformation message including musim-GapPreferenceList and / or musim-GapPriorityPreferenceList and / or musim-GapKeepPreference and the timer T346h is not running

[0457] - Condition 2: If reconfigurationWithSync was included in the masterCellGroup contained in the RRCReconfiguration message

[0458] If the USIM1 terminal initiated transmission of a UEAssistanceInformation message for the corresponding cell group during the last 1 second, and the UE is still configured to provide the concerned UE assistance information for the corresponding cell group, or

[0459] If the RRCReconfiguration message is applied due to a conditional reconfiguration execution or an LTM (L1 / L2 Triggered Mobility) cell switch procedure, and the UE is configured to provide UE assistance information for the corresponding cell group, and the UE has initiated transmission of a UEAssistanceInformation message for the corresponding cell group since it was configured to do so in accordance with 5.7.4.2

[0460] A USIM1 terminal according to one embodiment of the present disclosure is characterized by setting the content of a UEAssistanceInformation message according to the following series of procedures.

[0461] - If transmission of the UEAssistanceInformation message is initiated to provide musim-GapPreferenceList and / or musim-GapPriorityPreferenceList and / or musim-GapKeepPreference according to Condition 1 or Condition 2 above

[0462] If the UE has a preference for MUSIM periodic gap(s)

[0463] ◆ May include musim-GapPreferenceList with an entry for each periodic gap the UE prefers to be configured

[0464] ● Within the MUSIM-GapInfo Information Element (hereinafter IE), the duration value and repetition / offset value of each gap that the USIM1 terminal prefers to be configured with can be set in musim-GapLength and musim-GapRepetitionAndOffset.

[0465] If the USIM1 terminal has a preference for MUSIM gap priority

[0466] ◆ The USIM1 terminal may include the musim-GapPriorityPreferenceList the UE prefers to be configured.

[0467] If the USIM1 terminal has a preference for the MUSIM aperiodic gap

[0468] ◆ May include the field musim-GapPreferenceList, with one entry for the aperiodic gap the UE prefers to be configured

[0469] ● You can set the duration value of the gap that the UE prefers to be configured with in musim-GapLength within the musim-GapInfo IE.

[0470] ● Optionally, you can set the starting SFN (System Frame Number) / subframe of the gap that the UE prefers to be configured with in musim-Starting-SFN-AndSubframe.

[0471] If the UE has a preference to keep all colliding MUSIM gaps

[0472] ◆ may include musim-GapKeepPreference

[0473] The USIM1 terminal may initiate the transmission of a UEAssistanceInformation message to provide musim-GapPreferenceList and / or musim-GapPriorityPreferenceList and / or musim-GapKeepPreference in accordance with the above procedure, and may start the timer T346h with the value of musim-GapProhibitTimer. While conventional terminals include musim-GapKeepPreference in the UEAssistanceInformation message to maintain periodic MUSIM gaps only when they conflict, a USIM1 terminal according to one embodiment of the present disclosure includes preferences for periodic MUSIM gap(s) and / or non-periodic MUSIM gaps in musim-GapPreferenceList, and is characterized by including musim-GapKeepPreference in the UEAssistanceInformation message if it intends to maintain all of them when the periodic MUSIM gap(s) and / or non-periodic MUSIM gaps conflict. That is, a USIM1 terminal according to one embodiment of the present disclosure includes musim-GapKeepPreference in the UEAssistanceInformation message when it intends to maintain all conflicting MUSIM gaps even if a predetermined periodic MUSIM gap(s) and non-periodic MUSIM gaps conflict.For reference, when the above terminal needs to perform additional event / one-short / non-periodic based operations through periodic operations (for example, the operation of monitoring Paging Occasion is a periodic operation, but whether there is an actual paging message is event-based, and the operation to determine whether there is changed system information is a periodic operation, but if there is a change, the operation of the terminal to acquire the changed system information is an event, i.e., a non-periodic operation), the periodic MUSIM gap and the non-periodic MUSIM gap may conflict.

[0474] In step 1l-35, base station 1 (1l-04) may transmit a predetermined RRC message (e.g., RRCReconfiguration) containing musim-GapConfig to the USIM 1 terminal (1l-02). musim-GapConfig may include at least one of the following.

[0475] - List of items to release the configured MUSIM gap (musim-GapToReleaseList)

[0476] The above list consists of one or more identifiers (MUSIM-GapId).

[0477] Through the above list, the periodic MUSIM gap set for the terminal can be released.

[0478] - MUSIM gap list to add or modify (musim-GapToAddModList)

[0479] The above list consists of one or more MUSIM gaps, and each MUSIM gap consists of MUSIM gap configuration information (MUSIM-GapInfo) and an identifier (MUSIM-GapId) for it.

[0480] One or more periodic MUSIM gaps can be set for the terminal through the above list.

[0481] - Aperiodic MUSIM Gap setting information (musim-AperiodicGap)

[0482] A non-periodic MUSIM gap can be set for the terminal through MUSIM gap setting information (MUSIM-GapInfo).

[0483] - MUSIM gap priority list to add or modify (musim-GapPriorityToAddModList)

[0484] The above list may consist of one or more MUSIM Gap Priority values.

[0485] Through the above list, the terminal can set a gap priority value for each periodic MUSIM gap.

[0486] - An indicator (musim-GapKeep) indicating whether all types of conflicting MUSIM gaps (MUSIM periodic / aperiodic gaps) can be retained.

[0487] Through the above indicator, the terminal can be configured to maintain and use all types of conflicting MUSIM gaps even if at least one of the following conditions is satisfied.

[0488] ◆ Condition 1: When gap opportunities overlap along the time axis (gap occurrences are fully or partially overlapping in the time domain)

[0489] ◆ Condition 2: When the distance between two gap opportunities is equal to or smaller than 4ms

[0490] The distance between two gap opportunities refers to the time difference between the ending point of the first gap opportunity and the starting point of the second gap opportunity, meaning that the first gap opportunity occurs earlier than the second gap opportunity.

[0491] A terminal that receives musim-GapConfig can perform the following operations.

[0492] - If musim-GapConfig is set to setup

[0493] For each musim-GapId included in the received musim-GapToReleaseList, the UE shall release the periodic MUSIM gap configuration associated with the musim-GapId.

[0494] * For each musim-Gap included in the received musim-GapToAddModList

[0495] The UE shall set up periodic MUSIM gap configuration indicated by the MUSIM-Gap in accordance with the received musim-GapRepetitionAndOffset. The musim-GapRepetition and Offset values ​​are provided under the following conditions, and the first subframe of each periodic MUSIM gap occurs at an SFN (System Frame Number) and subframe of the NR PCell meeting the following condition.

[0496] condition:

[0497] SFN mod T = FLOOR(Offset / 10);

[0498] subframe = Offset mod 10;

[0499] with T = musim-GapRepetition / 10;

[0500] ◆ For each periodic MUSIM gap, you can set the MUSIM gap priority configuration indicated by musim-GapPriorityToAddModList.

[0501] If musim-AperiodicGap is included

[0502] ◆ The aperiodic MUSIM gap configuration indicated by the musim-AperiodicGap can be set up according to the received musim-Starting-SFN-AndSubframe. The first subframe of the aperiodic MUSIM gap may occur at an SFN and subframe of the NR PCell satisfying the following condition.

[0503] condition:

[0504] SFN = starting-SFN;

[0505] Subframe = startingSubframe;

[0506] If the base station is configured with musim-GapKeep, it can keep all colliding MUSIM gaps as specified in TS 38.133.

[0507] - If musim-GapConfig is set to release

[0508] The UE shall release the MUSIM gap configuration.

[0509] In step 1l-40, the USIM 1 terminal (1l-02) can transmit a predetermined RRC message (e.g., RRCReconfigurationComplete) to base station 1 (1l-04) in response to step 1l-35.

[0510] In step 1l-45, the USIM 1 terminal (1l-02) can determine whether the MUSIM gaps set up in step 1l-35 conflict. That is, if the MUSIM gap opportunities overlap along the time axis or if the distance between the MUSIM gap opportunities is less than or equal to 4ms, the terminal can determine that the MUSIM gaps conflict. For reference, step 1l-45 may be performed prior to step 1l-35.

[0511] In step 1l-50, if the USIM 1 terminal (1l-02) determines that there are conflicting MUSIM gaps in step 1l-45, it can maintain them if musim-GapKeep is set in step 1l-35. For reference, step 1l-50 may be performed before step 1l-35.

[0512] In step 1l-55, the USIM 1 terminal (1l-02) may not perform transmit / receive operations with Base Station 1 (1l-04) during the MUSIM gap it has decided to use. That is, the terminal may maintain the MUSIM gaps that conflicted in step 1l-50 and not perform transmit / receive operations with Base Station 1 (1l-04) (e.g., NR serving cells) during the gap(s). On the other hand, the USIM 2 terminal (1l-03) may perform necessary operations during the MUSIM gap(s). That is, the USIM 2 terminal (1l-03) may perform necessary operations (e.g., cell selection or cell reselection operations) with Base Station 2 (1l-05).

[0513] FIG. 1m is a block diagram illustrating the internal structure of a terminal (100) according to one embodiment of the present disclosure.

[0514] The terminal (100) is an electronic device capable of wireless communication and may have various form factors. Examples of the terminal may include at least one of a user device (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, a tablet, a wearable device, an Internet of Things (IoT) device, or other devices / systems capable of performing wireless communication with a base station (BS) and / or other terminals via a wireless channel.

[0515] Referring to FIG. 1m, the terminal (100) may include at least one communication unit (1m-30) (hereinafter, communication unit), at least one processor (1m-20) (hereinafter, processor), and at least one memory (1m-10) (hereinafter, memory). According to at least one or a combination thereof of methods corresponding to embodiments of the present disclosure, the communication unit (1m-30), processor (1m-20), and memory (1m-10) of the terminal (100) may be operated. However, the components of the terminal (100) are not limited to the examples of components shown in FIG. 1m. In other embodiments, the terminal (100) may include additional components in addition to the aforementioned components, or some components may be omitted. Also, in some embodiments, any combination of the communication unit (1m-30), processor (1m-20), or memory (1m-10) may be integrated into a single component.

[0516] The communication unit (1m-30) may be a basic communication circuit or communication circuitry that enables the terminal (100) to perform wireless communication with a node or entity of a network. For example, the communication unit (1m-30) may enable the terminal (100) to transmit and receive signals to and from a base station via cellular wireless communication, or to transmit and receive signals to and from another terminal via cellular wireless communication. For example, the communication unit (1m-30) may support at least one of various cellular wireless communication technologies including 3G (3rd generation), 4G (4th generation) LTE (long-term evolution), 5G (5th generation) NR (new radio), 6G (6th generation), etc., and the various cellular wireless communication technologies supported by the communication unit (1m-30) may include all subsequent evolved generations of wireless communication.

[0517] According to one embodiment, the terminal (100) may include a plurality of communication units, and for example, when supporting EN-DC (E-UTRA (evolved-universal terrestrial radio access) - NR dual connectivity), it may include a first communication unit that supports 4G LTE wireless communication and a second communication unit that supports 5G NR wireless communication. According to another embodiment, when the terminal (100) supports NR-DC (NR Dual Connectivity), the terminal (100) may include a plurality of communication units that support 5G NR wireless communication. According to another embodiment, when the terminal (100) supports short-range wireless communication, the terminal (100) may separately include a communication unit that supports at least one of a group of wireless communication protocol standards such as Bluetooth®, wireless LAN or WLAN (wireless local area network) network (including, but not limited to, IEEE (institute of electrical and electronics engineer) 802.11-2016 standard or modifications thereof such as 802.11ah, 802.11ad, 802.11ay, 802.11ax, 802.11az, 802.11ba and 802.11be).

[0518] According to one embodiment, the communication unit (1m-30) may include various circuit structures used to transmit and receive signals to and from a base station via a wireless channel. The signals may include control information and data. For example, the communication unit (1m-30) may be configured to include an RF (radio frequency) 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. The communication unit (1m-30) may output the signal received via the wireless channel to a processor (1m-20) and transmit the signal output from the processor (1m-20) via the wireless channel.

[0519] A processor (1m-20) can control the overall operation of a terminal (100) according to an embodiment of the present disclosure. The processor (1m-20) may be implemented as one or more IC (integrated circuit (or circuitry)) chips and may execute various data processing operations. The processor (1m-20) may include at least one electrical circuit and may execute instructions (or programs, code, data, etc.) stored in memory (1m-10) individually, collectively, or in any combination. Additionally, the processor (1m-20) may include a single-core processor or a multi-core processor, and in a specific implementation, may be composed of a processor assembly including a plurality of processing circuits.

[0520] The processor (1m-20) is electrically, operatively, and / or communicatively coupled to the communication unit (1m-30) so as to control the communication unit (1m-30).

[0521] The processor (1m-20) may include at least one processor (or processing circuitry), and at least one processor may perform the following operations individually, collectively, or in any combination. For example, the processor (1m-20) may include a communication processor (CP) that controls communication operations and an application processor (AP) that controls the execution of an upper layer (e.g., an application layer). In a specific embodiment, at least one part of the processor (1m-20) may be included in one chip (or IC), and another part of the processor (1m-20) may be included in a separate chip (or IC). Alternatively, at least one processor may be included in other components, such as a communication unit (1m-30) or a memory (1m-10).

[0522] The processor (1m-20) may perform, cause, or control the operation of a terminal to perform at least one of the methods according to the embodiments of the present disclosure or a combination thereof. For example, the processor (1m-20) may control the operation of a terminal to process a downlink signal received from a base station or to generate an uplink signal and transmit it to a base station. To this end, the processor (1m-20) may control other components of the terminal (100) to perform various operations by executing computer programs, code, or instructions stored in memory (1m-10).

[0523] Memory (1m-10) is a hardware storage device capable of storing information temporarily or permanently and may include one or more storage media. For example, memory (1m-10) may include a memory assembly comprising one or more storage media. For example, the one or more storage media may include a hard drive, flash memory, permanent memory such as ROM (read-only memory), semipermanent memory such as RAM (random access memory), cache memory, or any combination thereof.

[0524] The memory (1m-10) can be electrically, operatively, and / or communicatively coupled with the processor (1m-20) and can be accessed by the processor (1m-20).

[0525] A memory (1m-10) may store a computer program, code, or instruction that can be executed by a processor (1m-20). According to one embodiment, the computer program, code, or instruction that can be executed by the processor (1m-20) may be stored in a single memory device or may be separated and distributed across two or more memory devices. The processor (1m-20) may perform various functions according to the embodiments of the present disclosure by executing the instruction stored in the memory (1m-10).

[0526] According to one embodiment of the present disclosure, the operation of a terminal (100) may be caused to be performed based on at least one processor (or processing circuit) configured to perform the features of the present disclosure individually, collectively, or in any combination based on the execution of instructions (or computer programs or code) stored in memory (1m-10), based on processing circuitry not configured to execute instructions, and / or based on components of a processing circuitry not configured to execute instructions. FIG. 1n is a block diagram showing the configuration of an NR base station (200) according to one embodiment of the present disclosure.

[0527] The base station (200) can perform wireless communication with at least one terminal within the area of ​​the base station (200) via a wireless channel. The base station (200) can perform communication with a node or entity of the network via wired or wireless communication.

[0528] Referring to FIG. 1n, a base station (200) may include at least one communication unit (1n-30) (hereinafter, communication unit), at least one processor (1n-20) (hereinafter, processor), and at least one memory (1n-10) (hereinafter, memory). According to at least one or a combination thereof of methods corresponding to embodiments of the present disclosure, the communication unit (1n-30), processor (1n-20), and memory (1n-10) of the base station (200) may be operated. However, the components of the base station (200) are not limited to the examples of components shown in FIG. 1n. In other embodiments, the base station (200) may include additional components in addition to the aforementioned components, or some components may be omitted. Also, in some embodiments, any combination of the communication unit (1n-30), processor (1n-20), or memory (1n-10) may be integrated into a single component.

[0529] The communication unit (1n-30) may be a communication circuit or communication circuitry that enables the base station (200) to perform wireless communication with a node or entity of the network. For example, the communication unit (1n-30) may enable the base station (200) to transmit and receive signals to and from a terminal (100) via cellular wireless communication or to transmit and receive signals to and from another network entity via wireless communication. For example, the communication unit (1n-30) may support various cellular wireless communication technologies including 3G (3rd generation), 4G (4th generation) LTE (long-term evolution), 5G (5th generation) NR (new radio), 6G (6th generation), etc., and the various cellular wireless communication technologies supported by the communication unit (1n-30) may include all subsequent generations of wireless communication. According to one embodiment, the communication unit (1n-30) may include various circuit structures used to transmit and receive signals to and from a terminal via a wireless channel. The above signal may include control information and data. For example, the communication unit (1n-30) may be configured to include an RF (radio frequency) 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. The communication unit (1n-30) may output the signal received through a wireless channel to a processor (1n-20) and transmit the signal output from the processor (1n-20) through a wireless channel.

[0530] Meanwhile, according to one embodiment of the present disclosure, a base station (200) may communicate with an entity or node of a network via wired or wireless communication. For example, the base station (200) may communicate via wired or wireless communication with an entity or node of an adjacent base station or core network via a backhaul network. Although not shown in the drawings, when the base station (200) performs wired communication, the base station (200) may include a separate network interface for wired communication in addition to the communication unit (1n-30). The network interface may be referred to as network interface circuitry, communication interface circuitry, etc.

[0531] A processor (1n-20) can control the overall operation of a base station (200) according to an embodiment of the present disclosure. The processor (1n-20) may be implemented as one or more IC (integrated circuit or circuitry) chips and may execute various data processing operations. The processor (1n-20) may include at least one electrical circuit and may execute instructions (or programs, code, data, etc.) stored in memory (1n-10) individually, collectively, or in any combination. Additionally, the processor (1n-20) may include a single-core processor or a multi-core processor, and in a specific implementation, may be composed of a processor assembly including a plurality of processing circuits.

[0532] The processor (1n-20) is electrically, operatively, and / or communicatively coupled to the communication unit (1n-30) so as to control the communication unit (1n-30).

[0533] The processor (1n-20) may include at least one processor (or processor circuitry), and at least one processor may perform the following operations individually, collectively, or in any combination. In a specific embodiment, at least one part of the processor (1n-20) may be included in one chip (or IC), and another part of the processor (1n-20) may be included in a separate chip (or IC). Alternatively, at least one processor may be included in other components, such as a communication unit (1n-30) or a memory (1n-10).

[0534] The processor (1n-20) may perform, cause, or control the operation of a base station to execute at least one or a combination of methods according to embodiments of the present disclosure. For example, the processor (1n-20) may control the operation of a base station to generate a downlink signal and transmit it to a terminal, or to process an uplink signal received from a terminal. Alternatively, the base station may transmit and receive signals with an adjacent base station, transmit a signal received from a terminal to an upper node of the network, or receive a signal from an upper node of the network and transmit it to a terminal. To this end, the processor (1n-20) may control other components of the base station (200) to perform various operations by executing computer programs, codes, and instructions stored in memory (1n-10).

[0535] Memory (1n-10) is a hardware storage device capable of storing information temporarily or permanently and may include one or more storage media. For example, memory (1n-10) may include a memory assembly comprising one or more storage media. For example, the one or more storage media may include a hard drive, flash memory, permanent memory such as ROM (read-only memory), semi-permanent memory such as RAM (random access memory), cache memory, or any combination thereof.

[0536] The memory (1n-10) can be electrically, operatively, and / or communicatively coupled with the processor (1n-20) and can be accessed by the processor (1n-20).

[0537] A computer program, code, or instruction that can be executed by a processor (1n-20) may be stored in the memory (1n-10). According to one embodiment, the computer program, code, or instruction that can be executed by the processor (1n-20) may be stored in a single memory device or may be separated and distributed among two or more memory devices. The processor (1n-20) may perform various functions according to the embodiments of the present disclosure by executing the instruction stored in the memory (1n-10).

[0538] According to one embodiment of the present disclosure, the operation of a base station (200) may be caused to be performed based on at least one processor (or processing circuit) configured to perform the features of the present disclosure individually, collectively, or in any combination based on the execution of instructions (or computer programs or code) stored in memory (1n-10), based on processing circuitry not configured to execute instructions, and / or based on components of a processing circuitry not configured to execute instructions. According to one embodiment of the present disclosure, a method performed by a terminal in a wireless communication system comprises the steps of: transmitting terminal capability information to a base station including information regarding whether cell reselection is supported based on a low-power wake-up signal (LP-WUS); receiving system information including cell reselection information from the base station, wherein the cell reselection information includes information regarding cell reselection priority and relevant parameters per NR frequency; and receiving an LP-WUS for paging from the base station. It may include a step of performing a cell reselection procedure based on cell reselection information.

[0539] According to one embodiment of the present disclosure, a method performed by a terminal in a wireless communication system may include the steps of: transmitting a terminal capability information message to a base station that includes preference information regarding a multi-USIM gap; receiving a setting message from the base station that includes an auxiliary setting regarding the preference of the multi-USIM gap and an auxiliary setting regarding the priority of the multi-USIM gap; and transmitting a terminal auxiliary information message to provide information regarding the multi-USIM gap to the base station based on the setting message. The terminal auxiliary information message may include preference information regarding the maintenance of conflicting multi-USIM gaps.

[0540] In one embodiment, preference information for maintaining conflicting multi-SIM gaps may include information instructing to maintain periodic or non-periodic multi-SIM gaps where conflicts occurred.

[0541] In one embodiment, the terminal is configured to provide auxiliary information related to preference information for a multi-SIM gap through an auxiliary setting regarding preference for a multi-SIM gap, and may be configured to provide auxiliary information related to priority of a multi-SIM gap through an auxiliary setting regarding priority of a multi-SIM gap.

[0542] In one embodiment, the method may include the step of transmitting a terminal auxiliary information message when the terminal is configured to provide auxiliary information related to preference information for a multi-USIM gap based on a setting message.

[0543] In one embodiment, if reconfiguratonWithSync is included in the master cell group (masterCellGroup) included in the RRC reset message, a terminal auxiliary information message may be transmitted.

[0544] In one embodiment, if there is a preference for periodic multi-SIM gaps, the terminal auxiliary information message may include a multi-SIM gap preference list containing entries for periodic multi-SIM gaps.

[0545] In one embodiment, the terminal auxiliary information message may include a multi-SIM gap information element that sets the period value and repetition / offset value of the preferred gap.

[0546] In one embodiment, if there is a preference for non-periodic multi-USIM gaps, the terminal auxiliary information message may include a multi-USIM gap preference list field containing entries for non-periodic multi-USIM gaps.

[0547] In one embodiment, the terminal auxiliary information message may include a multi-USIM gap information element that sets a period value of a preferred gap.

[0548] In one embodiment, the terminal auxiliary information message may include information for setting the SFN (system frame number) where the preferred gap starts and the subframe.

[0549] According to one embodiment of the present disclosure, a method performed by a base station in a wireless communication system may include: receiving a terminal capability information message including preference information regarding a multi-USIM gap from a terminal; transmitting a setting message to the terminal including an auxiliary setting regarding the preference of a multi-USIM gap and an auxiliary setting regarding the priority of a multi-USIM gap; and receiving a terminal auxiliary information message including information regarding a multi-USIM gap from the terminal based on the setting message. The terminal auxiliary information message may include preference information regarding the maintenance of conflicting multi-USIM gaps.

[0550] According to one embodiment of the present disclosure, a terminal performing communication in a wireless communication system may include a memory storing a plurality of instructions and at least one processor executing a plurality of instructions stored in the memory. The terminal may transmit a terminal capability information message to a base station containing preference information regarding a multi-USIM gap by having a plurality of instructions executed individually or collectively by at least one processor. The terminal may receive a configuration message from a base station containing an auxiliary configuration regarding a preference for a multi-USIM gap and an auxiliary configuration regarding a priority of a multi-USIM gap by having a plurality of instructions executed individually or collectively by at least one processor. The terminal may transmit a terminal auxiliary information message to a base station to provide information regarding a multi-USIM gap based on the configuration message by having a plurality of instructions executed individually or collectively by at least one processor. The terminal auxiliary information message may include preference information regarding the maintenance of conflicting multi-USIM gaps.

[0551] A device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory storage medium' simply means that it is a tangible device and does not contain a signal (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily. For example, a 'non-transitory storage medium' may include a buffer in which data is stored temporarily.

[0552] According to one embodiment, the method according to the various embodiments disclosed herein may be provided by being included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., downloadable app) may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

Claims

In a method for a terminal to perform communication in a wireless communication system, A step of transmitting a terminal capability information message containing preference information for a multi-USIM gap to a base station; A step of receiving a setting message from the base station including an auxiliary setting regarding the preference of a multi-USIM gap and an auxiliary setting regarding the priority of a multi-USIM gap; and Based on the above setting message, the step of transmitting a terminal auxiliary information message to provide information regarding a multi-USIM gap to the base station; is included. The above terminal auxiliary information message includes preference information regarding the maintenance of conflicting multi-USIM gaps, and A method comprising preference information for maintaining the aforementioned conflicting multi-SIM gaps, including information instructing to maintain conflicting non-periodic multi-SIM gaps. In Article 1, A method comprising preference information for maintaining the aforementioned conflicting multi-SIM gaps, including information instructing to maintain conflicting periodic multi-SIM gaps. In Article 1, If there is a preference for non-periodic multi-USIM gaps, A method in which the above terminal auxiliary information message includes a multi-USIM gap preference list field containing entries for the above-mentioned non-periodic multi-USIM gaps. In Paragraph 3, A method in which the above terminal auxiliary information message includes a multi-USIM gap information element that sets a period value of a preferred gap. In Paragraph 3, A method in which the above terminal auxiliary information message includes information for setting the SFN (system frame number) and subframe where the preferred gap starts. In Article 1, If there is a preference for periodic multi-SIM gaps, A method in which the above terminal auxiliary information message includes a multi-SIM gap preference list containing entries for the periodic multi-SIM gaps and a multi-SIM gap information element that sets the period value and repetition / offset value of the preferred gap. In Article 1, The above terminal is configured to provide auxiliary information related to preference information for the multi-SIM gap through an auxiliary setting regarding the preference of the multi-SIM gap, and A method in which the above terminal is configured to provide auxiliary information related to the priority of the multi-SIM gap through an auxiliary setting regarding the priority of the multi-SIM gap. In Article 1, The step of transmitting the above terminal auxiliary information message is, A method comprising the step of transmitting the terminal auxiliary information message when the terminal is configured to provide auxiliary information related to preference information for the multi-USIM gap based on the above setting message. In Article 1, A method in which the terminal auxiliary information message is transmitted when the master cell group (masterCellGroup) included in the RRC reset message contains reconfiguratonWithSync. In a method for a base station to perform communication in a wireless communication system, A step of receiving a terminal capability information message from a terminal that includes preference information regarding a multi-USIM gap; A step of transmitting a setting message to the terminal including auxiliary settings regarding the preference of a multi-SIM gap and auxiliary settings regarding the priority of a multi-SIM gap; and Based on the above setting message, the step of receiving a terminal auxiliary information message from the terminal containing information regarding a multi-USIM gap; is included. The above terminal auxiliary information message includes preference information regarding the maintenance of conflicting multi-USIM gaps, and A method comprising preference information for maintaining the aforementioned conflicting multi-SIM gaps, including information instructing to maintain conflicting non-periodic multi-SIM gaps. In Article 10, A method comprising preference information for maintaining the aforementioned conflicting multi-SIM gaps, including information instructing to maintain conflicting periodic multi-SIM gaps. In Article 11, If there is a preference for non-periodic multi-USIM gaps, A method in which the above terminal auxiliary information message includes a multi-USIM gap preference list field containing entries for the above-mentioned non-periodic multi-USIM gaps and a multi-USIM gap information element for setting the period value of the gap. In a terminal that performs communication in a wireless communication system, Memory for storing multiple instructions; and It includes at least one processor that executes the plurality of instructions stored in the memory, By executing the above plurality of instructions individually or collectively by the at least one processor, the terminal, Transmit a terminal capability information message containing preference information for a multi-USIM gap to the base station, and Receives a configuration message from the above base station including auxiliary settings regarding the preference of a multi-USIM gap and auxiliary settings regarding the priority of a multi-USIM gap, Based on the above setting message, a terminal auxiliary information message is transmitted to the base station to provide information regarding the multi-USIM gap, and The above terminal auxiliary information message includes preference information regarding the maintenance of conflicting multi-USIM gaps, and A terminal, wherein preference information for maintaining the aforementioned conflicting multi-SIM gaps includes information instructing to maintain conflicting non-periodic multi-SIM gaps. In Paragraph 13, The preference information for maintaining the conflicting multi-SIM gaps above includes information instructing to maintain conflicting periodic multi-SIM gaps, a terminal. In Article 13, If there is a preference for non-periodic multi-USIM gaps, The terminal auxiliary information message comprises a multi-USIM gap preference list field containing entries for the aperiodic multi-USIM gaps and a multi-USIM gap information element for setting a period value of the gap.

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