Method and apparatus for mitigating reference signal measurements using location information of terminal

Abstract

The present disclosure relates to a method for operating a terminal in a wireless communication system and an apparatus for performing the method, the method being characterized by comprising the steps of: receiving, from a base station of a non-terrestrial network, reference location information of a cell operated by the base station; determining whether a trigger condition for performing an operation for saving power is satisfied based on the reference position information; and performing an operation for saving power when the trigger condition is satisfied.

Description

Technical Field

[0001] The present disclosure relates to operations of a UE and a base station in a wireless communication system, and in particular, to a method and apparatus for performing measurement relaxation using location information of a UE in a non-terrestrial network system. Background Art

[0002] Fifth-generation mobile communication technology defines wide frequency bands, enabling high transmission rates and new services. 5G mobile communication technology can be applied not only to frequency bands "below 6 GHz," such as 3.5 GHz, but also to frequency bands "above 6 GHz," known as mmWave, including 28 GHz and 39 GHz. Furthermore, to achieve transmission rates fifty times faster than 5G mobile communication technology and ultra-low latency one-tenth that of 5G mobile communication technology, 6G mobile communication technology (referred to as a "beyond 5G system") is being considered for implementation in the terahertz frequency band (e.g., the 95 GHz to 3 THz band).

[0003] In the initial stage of 5G mobile communication technology, in order to support services associated with enhanced Mobile Broadband (eMBB), Ultra-Reliable & Low Latency Communications (URLLC) and massive Machine-Type Communications (mMTC) and meet the performance requirements associated therewith, standardization is underway on the following items: beamforming and massive MIMO for mitigating radio wave path loss and increasing radio wave transmission distance in millimeter waves, parameter sets (numerology, for example, operating multiple subcarrier spacings) for efficient utilization of millimeter wave resources and dynamic operation of time slot formats, initial access technology supporting multi-beam transmission and broadband, definition and operation of BWP (bandwidth part), new channel coding methods such as LDPC (low-density parity check) codes for large-capacity data transmission and polar codes for highly reliable transmission of control information, L2 preprocessing, and network slicing for providing specialized networks tailored to specific services.

[0004] Currently, in view of the services to be supported by 5G mobile communication technologies, discussions are underway on improvements and performance enhancements to initial 5G mobile communication technologies, and there is already physical layer standardization on technologies such as Vehicle-to-Everything (V2X) for assisting driving determination of autonomous vehicles based on information sent by vehicles about the location and status of vehicles and for enhancing user convenience, New Radio Unlicensed (NR-U) for system operation in unlicensed frequency bands that complies with various regulatory requirements, NR UE power saving, Non-Terrestrial Network (NTN) as UE-satellite direct communication for ensuring coverage in areas where communication with terrestrial networks is unavailable, and positioning.

[0005] Furthermore, in the area of radio interface architecture / protocols, standardization is underway on technologies such as the Industrial Internet of Things (IIoT), which supports new services through interworking and integration with other industries; Integrated Access and Backhaul (IAB), which provides nodes for expanding network service areas by integrating wireless backhaul and access links; mobility enhancements including conditional handover and Dual Active Protocol Stack (DAPS) handover; and two-step random access (NR two-step RACH) for simplifying the random access procedure. In the area of system architecture / services, standardization is also underway on a 5G baseline architecture (e.g., a service-based architecture or service-based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies; and Mobile Edge Computing (MEC), which allows for receiving services based on the location of the UE.

[0006] If such a 5G mobile communication system is commercialized, the already exponentially growing number of connected devices will be connected to the communication network, and it is therefore expected that enhanced functionality and performance of the 5G mobile communication system and the integrated operation of connected devices will be necessary. To this end, new research is being planned related to: xtended reality (XR) for efficient support of augmented reality (AR), virtual reality (VR), mixed reality (MR), etc.; 5G performance improvement and complexity reduction through the use of artificial intelligence (AI) and machine learning (ML); support for AI services; support for metaverse services; and drone communications.

[0007] Furthermore, such advancements in 5G mobile communication systems will serve not only as a foundation for the development of new waveforms, Full Dimensional MIMO (FD-MIMO), multi-antenna transmission technologies (such as array antennas and massive antennas) for ensuring coverage in the terahertz band for 6G mobile communication technology, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional spatial multiplexing technologies using orbital angular momentum (OAM), and reconfigurable intelligent surfaces (RIS), but will also serve as a foundation for the development of full-duplex technologies for improving the frequency efficiency and system networks of 6G mobile communication technology, AI-based communication technologies for achieving system optimization by leveraging satellites and AI (artificial intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technologies for implementing services with a complexity level that exceeds the operational capabilities of UEs by utilizing ultra-high-performance communication and computing resources.

[0008] A method and apparatus for supporting mobility using the location information of a UE in a non-terrestrial network system are proposed. When the UE uses the method and apparatus, unlike a traditional method based on signal strength, a method for supporting mobility using measurements of the relative position between the UE and the network is required. Summary of the Invention

[0009] Technical issues

[0010] The disclosed embodiments provide a method and apparatus for performing measurement relaxation using location information of a UE in a non-terrestrial network system in a wireless communication system.

[0011] Technical Solution

[0012] An embodiment of the present disclosure may provide an operating method for a terminal in a wireless communication system, the method comprising: receiving reference location information of a cell operated by a base station of a non-terrestrial network from the base station; determining whether a trigger condition for performing an operation for power saving is met based on the reference location information; and performing the operation for power saving if the trigger condition is met.

[0013] In addition, an embodiment of the present disclosure may provide a terminal of a wireless communication system, which includes a transceiver and a controller, wherein the controller is configured to: receive reference location information of a cell operated by a base station of a non-terrestrial network from the base station, determine whether a trigger condition for performing an operation for power saving is met based on the reference location information, and control the execution of the operation for power saving if the trigger condition is met.

[0014] The technical subjects pursued in the present disclosure may not be limited to the above-mentioned technical subjects, and other technical subjects not mentioned may be clearly understood by those skilled in the art to which the present disclosure belongs from the following description.

[0015] Beneficial effects

[0016] According to various embodiments of the present disclosure, an apparatus and method capable of reducing power consumption of a UE may be provided by a method for efficiently obtaining a position of the UE and relaxing measurement in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The reference location and coverage distance threshold of each non-terrestrial network (NTN) network and the relative distance of the UE from the reference location of each network in an environment where two NTN cells coexist according to an embodiment of the present disclosure are shown.

[0018] Figure 2 The mobility of a UE moving within an NTN cell according to an embodiment of the present disclosure is shown.

[0019] Figure 3 A stationary and non-moving UE in a terrestrial network in a terrestrial mobile cell scenario and an NTN base station for operating the network according to an embodiment of the present disclosure are shown.

[0020] Figure 4 The relationship between a moving satellite base station, a moving cell in a terrestrial network in which the corresponding base station provides services, and a moving UE according to an embodiment of the present disclosure is shown.

[0021] Figure 5 FIG. 4 shows the position relationship of UEs in an NTN cell according to an embodiment of the present disclosure.

[0022] Figure 6An environment in which a terrestrial network (TN) and a non-terrestrial network (NTN) coexist and one or more TNs coexist in a relatively large NTN and a UE in the environment are shown.

[0023] Figure 7 The acquisition of information and triggering events according to various embodiments of the present disclosure are shown.

[0024] Figure 8 Various distance thresholds for a reference signal measurement operation of a UE according to various embodiments of the present disclosure are shown.

[0025] Figure 9 The structure of a base station according to an embodiment of the present disclosure is shown.

[0026] Figure 10 The structure of a UE according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0027] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that in the accompanying drawings, identical or similar elements are represented by identical or similar reference numerals as much as possible. In addition, detailed descriptions of known functions or configurations that may make the subject matter of the present disclosure unclear will be omitted.

[0028] When describing the embodiments set forth herein, descriptions related to technical contents well known in the art and not directly related to the present disclosure will be omitted. Such unnecessary descriptions are omitted in order to prevent the main idea of the present disclosure from being obscured and to convey the main idea more clearly.

[0029] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In each of the accompanying drawings, the same or corresponding elements are given the same reference numerals.

[0030] The advantages and features of the present disclosure and the manner in which they are achieved will become apparent by reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but may be implemented in various forms. The following embodiments are provided only to fully disclose the present disclosure and to inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals indicate the same or similar elements.

[0031] Here, it will be understood that each box of the flowchart diagram and the combination of boxes in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that the instructions executed by the processor of the computer or other programmable data processing device create equipment for implementing the functions specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can guide the computer or other programmable device to operate in a particular manner so that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including instruction equipment that implements the functions specified in one or more flowchart boxes. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process so that the instructions running on the computer or other programmable device provide steps for implementing the functions specified in one or more flowchart boxes.

[0032] In addition, each block in the flowchart diagram may represent a code module, code segment, or code portion that includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions mentioned in the blocks may not appear in order. For example, two blocks shown in succession may actually run substantially simultaneously, or the blocks may sometimes run in reverse order, depending on the functions involved.

[0033] As used in the embodiments of the present disclosure, the term "unit" refers to a software element or a hardware element, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and a "unit" can perform certain functions. However, "unit" does not always have a meaning limited to software or hardware. A "unit" can be configured to be stored in an addressable storage medium or to run one or more processors. Therefore, a "unit" includes, for example, a software element, an object-oriented software element, a class element or a task element, a process, a function, a property, a procedure, a subroutine, a program code segment, a driver, firmware, microcode, a circuit, data, a database, a data structure, a table, an array, and a parameter. The elements and functions provided by a "unit" can be combined into a smaller number of elements or "units", or divided into a larger number of elements or "units". In addition, elements and "units" can be implemented as replicating one or more CPUs within a device or a secure multimedia card.

[0034] In the following description, for the sake of convenience, terms used to identify access nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various types of identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms described below, and other terms referring to subjects having equivalent technical meanings may also be used.

[0035] In the following description, a base station is an entity that allocates resources to a terminal and can be at least one of a gNode B, eNode B, Node B, base station (BS), wireless access unit, base station controller, and node on a network. A terminal can include user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, "downlink (DL)" refers to the radio link via which a base station transmits signals to a terminal, and "uplink (UL)" refers to the radio link via which a terminal transmits signals to a base station. Furthermore, in the following description, LTE or LTE-A systems may be described by way of example, but embodiments of the present disclosure can be applied to other communication systems with similar technical backgrounds or channel types. Examples of such communication systems include fifth-generation mobile communication technologies (5G, New Radio, and NR) developed after LTE-A. In the following description, "5G" may be a concept covering existing LTE, LTE-A, and other similar services. Furthermore, based on the determination of those skilled in the art, the present disclosure can also be applied to other communication systems with some modifications without significantly departing from the scope of this disclosure. Here, it will be understood that each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by computer program instructions.

[0036] In the following description of this disclosure, for convenience, terms and names defined in the 5GS and NR standards, which are standards specified by the 3rd Generation Partnership Project (3GPP) group among existing communication standards, will be used. However, this disclosure is not limited to these terms and names and can be applied in the same manner to systems that comply with other standards. For example, this disclosure can be applied to 3GPP 5GS / NR (5th generation mobile communication standards).

[0037] Figure 1 The reference location and coverage distance threshold of each non-terrestrial network (NTN) network and the relative distance of the UE from the reference location of each network in an environment where two NTN cells coexist according to an embodiment of the present disclosure are shown.

[0038] according to Figure 1 , the UE may measure the distances between the UE and reference locations of different NTN cells, compare them, and access a relatively close NTN cell to perform wireless communication.

[0039] The UE can measure and compare the relative distances between its location and the reference locations of various NTN cells in real time. For example, the UE can measure the relative distance to the reference location of NTN#2 (distance from the UE to NTN#2) based on its location, and can also measure the relative distance to the reference location of NTN#1 (distance from the UE to NTN#1) based on its location.

[0040] The UE may perform power saving operations if conditions are met. For example, the UE may reduce power consumption by increasing the measurement period of the reference signal, such as configuring a measurement period that is longer than the existing measurement period of the reference signal sent by the base station of the cell, or suspending the measurement of the reference signal of the cell.

[0041] Since conditions need to be satisfied in order for the UE to perform a power saving operation, the following UE states and determination criteria may be considered.

[0042] - Conditions where the UE is stationary in the radio resource control (RRC) connected state

[0043] - Conditions where the UE is stationary in RRC idle mode or inactive mode

[0044] - Conditions where the UE in RRC connected state has low mobility

[0045] -UE in RRC idle mode or inactive mode with low mobility conditions

[0046] -Conditions where the UE in the RRC connected state is determined to be not near the cell edge (non-cell edge)

[0047] -Conditions where a UE in RRC idle mode or inactive mode is determined to be not near a cell edge (non-cell edge)

[0048] -The UE in the RRC connected state is determined to have good serving cell quality conditions

[0049] - A UE in RRC idle mode or inactive mode is determined to have good serving cell quality

[0050] -Conditions where a UE in the RRC connected state is determined to have low mobility and is not near a cell edge (non-cell edge)

[0051] -Conditions where a UE in RRC idle mode or inactive mode is determined to have low mobility and is not near a cell edge (non-cell edge)

[0052] - A UE in the RRC connected state is determined to have low mobility and good serving cell quality conditions

[0053] -UE in RRC idle mode or inactive mode is determined to have low mobility and has good serving cell quality conditions

[0054] When one of the above conditions is met, the UE may reduce power consumption by performing one or more of the following power saving operations.

[0055] - The UE may reduce power consumption by configuring a measurement period that is longer than an existing measurement period of all reference signals transmitted by the base station of the corresponding cell in a cell that meets the conditions.

[0056] - The UE may reduce power consumption by configuring a measurement period that is longer than an existing measurement period of a reference signal that meets the conditions and is sent by a base station of the corresponding cell in a cell that meets the conditions.

[0057] - The UE can reduce power consumption by suspending measurement of all reference signals sent by the base station of the corresponding cell within the cell that meets the conditions.

[0058] - The UE may reduce power consumption by suspending measurement of a reference signal meeting the conditions and sent by the base station of the corresponding cell within the cell meeting the conditions.

[0059] -The UE may reduce power consumption by configuring a measurement period longer than the existing measurement period for specific reference signals that meet the conditions (e.g., all synchronization signal blocks (SSBs), all channel state information – reference signals (CSI-RSs), SSB groups configured by the base station, CSI-RS groups configured by the base station, SSBs configured by the base station, and CSI-RS configured by the base station) within the cell.

[0060] Hereinafter, low mobility determination and reference signal measurement relaxation are first described.

[0061] Figure 2 The mobility of a UE moving within an NTN cell according to an embodiment of the present disclosure is shown.

[0062] refer to Figure 2, the UE moves in a predetermined direction and can measure the relative distance between the UE's position and the reference position of the NTN cell along the movement trajectory at predetermined time intervals (e.g., the time interval from T1 to T3), and record the relative distance. In this case, the change in the measured distance (e.g., |D2-D1| / (T2-T1) or |D3-D2| / (T3-T2)) is the UE's speed. In this case, when the interval between T1 and T2 is the same as the interval between T2 and T3, the UE is a UE that periodically measures the distance.

[0063] When the speed is equal to or lower than a predetermined level, the UE may determine that the corresponding UE has low mobility and, in response to this determination, relax the reference signal measurement criteria for radio resource measurement (RRM) to save power. For example, when the UE determines that the corresponding UE has low mobility, the UE may increase the period for measuring the reference signal compared to the current period and reduce the number of reference signal measurements per unit time to save power.

[0064] To this end, in order to determine that the UE has low mobility, the UE may measure or obtain a measured value, for example, at least one of a relative distance value between the UE and a reference location of a cell, a change in the relative distance value, and a relative speed value obtained by dividing the change in the relative distance value by a measurement time difference. The UE may perform an operation of making the determination by comparing at least one of the measured and obtained values with a reference threshold value, and for this purpose, the network may provide the UE with required information, such as a parameter value.

[0065] [Example Low Mobility 1] The reference distance (D) is subtracted from the distance (D) between the reference position of the measured cell (eg, serving cell) and the position of the UE. ref ) and the value obtained is less than the threshold value configured by the network (D SearchDeltaP ), or by subtracting the reference distance (D) from the distance (D) between the reference position of the measured serving cell and the UE’s position ref ) is obtained at the time interval configured by the base station (T SearchDeltaP ) is less than the threshold configured by the network (D SearchDeltaP ), the UE may determine that the low mobility condition is met.

[0066] In this case, the reference distance (D ref ) can be reconfigured according to the following conditions.

[0067] a. In the case that the UE selects or reselects a new cell, the reference distance is reconfigured to the distance (D) between the reference position of the cell being measured and the UE’s position

[0068] b. When the UE accesses a new cell or reselects a cell, the reference distance is reconfigured to the distance (D) between the reference position of the cell being measured and the UE’s position.

[0069] c. By passing the existing reference distance (D ref If the value obtained by subtracting the distance (D) between the reference position of the currently measured cell and the UE's position from the reference position is greater than 0, the reference distance is reconfigured to the currently measured distance (D).

[0070] d. In T configured by the base station SearchDeltaP If the conditions are not met within the specified time, the reference distance will be reconfigured to the currently measured distance (D).

[0071] e. In T configured by the base station SearchDeltaP If the condition has not been met for at least one time within the specified time frame, the reference distance will be reconfigured to the currently measured distance (D).

[0072] Table 1

[0073]

[0074] [Example Low Mobility 2] The distance (D) between the reference position corresponding to the measured cell (eg, serving cell) and the position of the UE is less than the reference distance (D ref ) is the difference between |D - D ref The value of | is less than the threshold configured by the network (D SearchDeltaP ), or when the distance (D) between the reference position corresponding to the measured serving cell and the UE's position is less than the reference distance (D ref ) is the difference between |D - D ref The value of | is set at the time interval configured by the base station (T SearchDeltaP ) is less than the threshold configured by the network (D SearchDeltaP ), the UE may determine that the low mobility condition is met.

[0075] In this case, the reference distance (D ref ) can be reconfigured according to the following conditions.

[0076] a. In the case that the UE selects or reselects a new cell, the reference distance is reconfigured to the distance (D) between the reference position of the cell being measured and the UE’s position

[0077] b. When the UE accesses a new cell or reselects a cell, the reference distance is reconfigured to the distance (D) between the reference position of the cell being measured and the UE’s position.

[0078] c. By passing the existing reference distance (D ref If the value obtained by subtracting the distance (D) between the reference position of the currently measured cell and the UE's position from the reference position is greater than 0, the reference distance is reconfigured to the currently measured distance (D).

[0079] d. The distance (D) between the reference position corresponding to the serving cell and the UE's position and the reference distance (D ref ) is the difference between |D - D ref The value of | is greater than the threshold configured by the network (D SearchDeltaP ), reconfigure the reference position to the currently measured distance (D)

[0080] e. In T configured by the base station SearchDeltaP If the conditions are not met within the specified time, the reference distance will be reconfigured to the currently measured distance (D).

[0081] f. In T configured by the base station SearchDeltaP If the condition has not been met for at least one time within the specified time frame, the reference distance will be reconfigured to the currently measured distance (D).

[0082] Table 2

[0083]

[0084] [Example Low Mobility 3] The distance (D) between the reference position corresponding to the measured cell (eg, serving cell) and the position of the UE is less than the reference distance (D ref ) is the difference between |D - D ref The value of | is less than the threshold configured by the network (D SearchDeltaP ), or when the distance (D) between the reference position corresponding to the measured serving cell and the UE's position is less than the reference distance (D ref ) is the difference between |D - D ref The value of | is set at the time interval configured by the base station (T SearchDeltaP ) is less than the threshold configured by the network (D SearchDeltaP ), the UE may determine that the low mobility condition is met.

[0085] In this case, the reference distance (D ref ) can be reconfigured according to the following conditions.

[0086] a. In the case that the UE selects or reselects a new cell, the reference distance is reconfigured to the distance (D) between the reference position of the cell being measured and the UE’s position

[0087] b. When the UE accesses a new cell or reselects a cell, the reference distance is reconfigured to the distance (D) between the reference position of the cell being measured and the UE’s position.

[0088] c. In the case that the value obtained by subtracting the distance (D) between the reference position of the currently measured cell and the UE's position from the existing reference distance (Dref) is greater than 0, reconfigure the reference distance to the currently measured distance (D)

[0089] d. The distance (D) between the reference position corresponding to the serving cell and the UE's position and the reference distance (D ref ) is the difference between |D - D ref The value of | is greater than the threshold configured by the network (D SearchDeltaP ), reconfigure the reference position to the currently measured distance (D)

[0090] e. In T configured by the base station SearchDeltaP If the conditions are not met within the specified time, the reference distance will be reconfigured to the currently measured distance (D).

[0091] f. In T configured by the base station SearchDeltaP If the condition has not been met for at least one time within the specified time frame, the reference distance will be reconfigured to the currently measured distance (D).

[0092] g. After passing T configured by the base station SearchDeltaP In the case of , the reference distance is unconditionally reconfigured to the currently measured distance (D). In this configuration, the UE can obtain the reference distance (D) in each period configured by the base station. ref ) and the current measured distance (D) to obtain the instantaneous relative speed (|D - D ref | / T SearchDeltaP ), which can be compared with the relative distance (D SearchDeltaP ) to compare the relative speed with the speed configured by the base station (D SearchDeltaP / T SearchDeltaP ) for comparison.

[0093] Table 3

[0094]

[0095] [Example Low Mobility 4] By comparing the distance (D) between the reference position corresponding to the measured cell (eg, serving cell) and the position of the UE with the reference distance (D ref ) is the difference between |D - D ref The value of | is divided by the time interval configured by the base station (T SearchDeltaP ) and the value obtained (|D - Dref | / T SearchDeltaP ) is less than the speed threshold configured by the network (V SearchDeltaP ), the UE may determine that the low mobility condition is met.

[0096] In this case, the reference distance (D ref ) can be reconfigured according to the following conditions.

[0097] h. In the event that the UE selects or reselects a new cell, the reference distance is reconfigured to the distance (D) between the reference position of the cell being measured and the UE’s position.

[0098] i. When the UE accesses a new cell or reselects a cell, the reference distance is reconfigured to the distance (D) between the reference position of the measured cell and the UE’s position.

[0099] j. If the value obtained by subtracting the distance (D) between the reference position of the currently measured cell and the UE's position from the existing reference distance (Dref) is greater than 0, reconfigure the reference distance to the currently measured distance (D)

[0100] k. The distance (D) between the reference position corresponding to the serving cell and the UE's position is proportional to the reference distance (D ref ) is the difference between |D - D ref The value of | is greater than the threshold configured by the network (D SearchDeltaP ), reconfigure the reference position to the currently measured distance (D)

[0101] l. By comparing the distance (D) between the reference position corresponding to the serving cell and the UE's position with the reference distance (D ref ) is the difference between |D - D ref The value of | is divided by the time interval configured by the base station (T SearchDeltaP ) and the value obtained (|D -D ref | / T SearchDeltaP ) is greater than the speed threshold configured by the network (V SearchDeltaP ), reconfigure the reference distance to the currently measured distance (D)

[0102] m. In T configured by the base station SearchDeltaP2 If the conditions are not met within the specified time, the reference distance will be reconfigured to the currently measured distance (D).

[0103] n. In T configured by the base station SearchDeltaP2 If the condition has not been met for at least one time within the specified time frame, the reference distance will be reconfigured to the currently measured distance (D).

[0104] o. After passing T configured by the base stationSearchDeltaP In the case of , the reference distance is unconditionally reconfigured to the currently measured distance (D)

[0105] Table 4

[0106]

[0107] [Example Low Mobility 5] The UE may sequentially measure and store the distance between the reference position of the measured cell (eg, serving cell) and the UE's position, for example, with the most recently measured distance being indicated as the i-th distance value D i In the case of i-1 Compare and compare, and by corresponding to the i-th distance value D i The distance value D from the immediately previous measurement i-1 The difference between |D i-1 -D i The value of | is divided by the time interval configured by the base station (T SearchDeltaP ) and the value obtained (|D i-1 -D i | / T SearchDeltaP ) is less than the speed threshold configured by the network (V SearchDeltaP ), it can be determined that the low mobility condition is met.

[0108] In this case, the corresponding time interval (T SearchDeltaP ) can be configured by the base station sending a signal to the UE.

[0109] Table 5

[0110]

[0111] [Example Low Mobility 6] The UE may sequentially measure and store the distance between the reference position of the measured cell (eg, serving cell) and the UE's position, for example, with the most recently measured distance being indicated as the i-th distance value D i In the case of i-1 For comparison, the distance value D corresponding to the i-th i The distance value D from the immediately previous measurement i-1 The difference between |D i-1 -D i The value of | is related to the threshold value configured by the network (D SearchDeltaP ) for comparison, and in |D i-1 -D i The value of | is less than the threshold value (D SearchDeltaP ), it can be determined that the low mobility condition is met.

[0112] In this case, the corresponding time interval (T SearchDeltaP ) can be configured by the base station sending a signal to the UE.

[0113] Table 6

[0114]

[0115] refer to Figure 2 , a criterion has been proposed for determining whether a UE satisfies a low mobility condition according to a change in a relative position difference of the UE moving with respect to a reference position of a fixed NTN cell.

[0116] Figure 3 A stationary and non-moving UE and an NTN base station for operating a network in a terrestrial mobile cell scenario (a scenario in which the location of a cell providing service also changes while moving) according to an embodiment of the present disclosure are shown.

[0117] refer to Figure 3 , in an environment where the UE does not move but the base station moves and the reference position of the cell provided by the base station also moves, a situation is shown where the relative distance D between the UE and the reference position of the base station also has different values (such as D1, D2, and D3) according to the measured time points T1, T2, and T3. Considering the land mobile cell NTN#1, in the case where the UE does not move, the speed of the base station can be indicated by the relatively changing distance, and the speed of the base station can be obtained by dividing the difference between two different distance values measured at corresponding time intervals by the time interval T at which the UE measures the relative distance. SearchDeltaP In the case of time intervals obtained in the form (|D2 - D1| / T SearchDeltaP ) to indicate.

[0118] In other words, in this environment, the speed of the base station can be expressed as a constant value represented by the difference in distances measured by the stationary UE (e.g., (|D2 - D1| / T SearchDeltaP ) = V NTN_gNB ), and whether the UE is moving at the same speed relatively to the land mobile cell or moving away from the cell quickly can be determined by comparing the constant value with the value actually measured by the UE.

[0119] refer to Figure 4 Describe in more detail. Figure 4 The relationship between a moving satellite base station, a moving cell in a terrestrial network in which the corresponding base station provides services, and a moving UE according to an embodiment of the present disclosure is shown.

[0120] refer to Figure 4, it is possible to identify a moving satellite base station, a changing reference position of a land mobile cell NTN#1 served by the corresponding base station, a UEa moving in the same direction relative to the land mobile cell NTN#1, and a UEb moving in a different direction relative to the land mobile cell NTN#1. Figure 4 In , the directions of two UEs are opposite to each other, but the moving speeds are assumed to be almost similar.

[0121] refer to Figure 4 , in the case of UEa, the relative speed to the land mobile cell NTN#1 can be expressed as |D a2 -D a1 | / T SearchDeltaP , and in the case of UEb, the relative speed to the land mobile cell NTN#1 can be expressed as |D b2 -D b1 | / T SearchDeltaP In addition, the relative speed of UEa (|D a2 -D a1 | / T SearchDeltaP ) is less than the relative speed of UEb (|D b2 -D b1 | / T SearchDeltaP ). In the relative speed and Figure 3 The speed of the land mobile cell NTN#1 is shown (|D2 - D1| / T SearchDeltaP ) for comparison, assuming that the speed is less than the relative speed of UEb (|D b2 -D b1 | / T SearchDeltaP ) and is greater than the relative speed of UEa (|D a2 -D a1 | / T SearchDeltaP ).

[0122] In the case of a land mobile cell following a non-land base station moving in the air, a suitable method may be as follows Figure 4 As shown, the relative speeds are compared in order to determine whether the UE has a longer residence time in the corresponding cell. In this case, as a solution for reference signal measurement relaxation and thus power saving, it is possible to use the reference position configured by the base station and various thresholds. Figure 2 The various solutions described in . can be applied similarly by Figure 2 Described are low mobility determination conditions and a reference signal measurement method performed accordingly.

[0123] In various embodiments of the present disclosure, when the UE operates in various modes (such as idle mode, RRC idle mode, inactive mode, RRC inactive mode, connected mode, or RRC connected mode), a low mobility determination condition may be used as needed, and the mobility of the UE may be determined.

[0124] Through this determination, the UE can be determined to have a relatively low probability of being outside the cell when having low mobility, and accordingly, power can be saved by changing the channel measurement frequency (such as increasing the RRM measurement period or increasing the radio link monitoring (RLM) monitoring period).

[0125] In various embodiments of the present disclosure, in the case where the UE operates in various modes (such as idle mode, RRC idle mode, inactive mode, RRC inactive mode, connected mode, or RRC connected mode), a low mobility determination condition may be used to determine whether the UE is a UE that hardly moves (stationary UE) by using a smaller threshold.

[0126] Through this determination, the UE can be determined to have a relatively low probability of being outside the cell with almost no mobility, and accordingly, power can be saved by changing the channel measurement frequency (such as increasing the RRM measurement period or increasing the radio link monitoring (RLM) monitoring period).

[0127] Hereinafter, according to various embodiments of the present disclosure, a method for determining low mobility and a reference signal measurement relaxation method in a case where a UE is not at a cell edge (non-cell edge) are described.

[0128] [Example non-cell edge]

[0129] Figure 5 FIG. 4 shows the position relationship of UEs in an NTN cell according to an embodiment of the present disclosure. Figure 5 , the UE belonging to NTN cell #1 compares the distance D between the cell's reference position and the UE's position with a distance threshold D from the cell's reference position that can be configured by the cell. SearchThresholdP When the distance D of the UE has a value smaller than the distance threshold, it can be determined that the UE is located at the center of the cell.

[0130] Table 7

[0131]

[0132] In various embodiments of the present disclosure, when the UE operates in idle mode, RRC idle mode, inactive mode, RRC inactive mode, connected mode or RRC connected mode, conditions for determining whether the UE is located at the center of the cell can be used as needed, and the relative location of the UE in the cell can be determined.

[0133] In various embodiments of the present disclosure, a determination condition may be used to determine whether the UE is located in a position where the UE can stably receive services from a cell. When the UE operates in various modes (such as idle mode, RRC idle mode, inactive mode, RRC inactive mode, connected mode, or RRC connected mode), the condition may be used as needed to determine the relative position of the UE in the cell.

[0134] Through this determination, when it is determined that the UE is located at the center of the cell, the UE can be determined to have a relatively low probability of being outside the cell, and accordingly, power can be saved by changing the channel measurement frequency (such as increasing the RRM measurement period or increasing the radio link monitoring (RLM) monitoring period).

[0135] Depending on the configuration, the UE may perform power saving operations if one or more certain conditions are met.

[0136] In various embodiments of the present disclosure, the terminal may receive a configuration from the base station so as to determine whether one or more of the above-mentioned examples [Example Low Mobility 1] to [Example Low Mobility 6] for determining whether the UE has low mobility are simultaneously satisfied.

[0137] For example, the UE may receive one or more of the configurations described above in Examples [Example Low Mobility 1] through [Example Low Mobility 6] to determine whether the UE has low mobility. Furthermore, the UE may receive a configuration from the base station to determine whether a condition based on a change in received signal strength, which can be determined using a reference signal received from the base station, is satisfied. For example, the UE may receive a configuration from the base station to determine whether the following conditions (UE location and received signal strength) are simultaneously satisfied.

[0138] Table 8

[0139]

[0140] Here, S SearchDeltaP and T SearchDeltaP Indicates the received signal strength threshold and received signal measurement time configured by the base station respectively.

[0141] In another embodiment of the present disclosure, the UE may determine at least one of a series of conditions configured by the base station, for example, [Example Low Mobility 1] to [Example Low Mobility 6] and [Example Low Mobility S], and if at least one condition is met, the UE may determine that it is in a low mobility state and may perform power saving operations.

[0142] In case the mobility of the UE is determined considering both the received signal strength and the position of the UE, the mobility can be determined more accurately compared to a determination criterion that considers only one of the received signal strength and the position of the UE.

[0143] Furthermore, in various embodiments of the present disclosure, the UE may be configured to determine not only whether the aforementioned example of determining whether the UE is located closer to the cell center (example non-cell edge) is satisfied, but also whether a condition based on a change in received signal strength, which may be determined using a reference signal received from a base station, is satisfied. For example, the UE may receive a configuration from the base station to determine whether the following conditions (UE location and received signal strength) are simultaneously satisfied.

[0144] Table 9

[0145]

[0146] Here, S SearchDeltaP and S SearchDeltaQ The thresholds of the reference signal received power (RSRP) and the reference signal received quality (RSRQ) values, which are configured by the base station and correspond to the received signal strength, are respectively indicated.

[0147] In case of determining whether the UE is located near the cell center or whether the serving cell quality is good considering both the received signal strength and the UE's location, it can be determined more accurately than a determination criterion considering only one of the received signal strength and the UE's location.

[0148] In addition, in various embodiments of the present disclosure, the UE may receive a configuration from the base station to determine whether the UE has low mobility and whether the UE is located near the cell center. For example, the UE may receive a configuration from the base station to determine whether at least one or one or more of the above-mentioned examples [Example Low Mobility 1] to [Example Low Mobility 6] and [Example Low Mobility S] are satisfied, and whether at least one or one or more of [Example Non-Cell Edge] and [Example Non-Cell Edge S] are satisfied.

[0149] In the case of determining whether both the UE has low mobility and whether the UE is located near the cell center in consideration of both the received signal strength and the location of the UE, it can be determined more accurately compared to a determination criterion that considers only one condition.

[0150] In various embodiments of the present disclosure, a UE may receive a configuration to determine not only the conditions in the example (non-cell-edge example) provided above for determining whether the quality of a serving cell is good, but also conditions based on changes in received signal strength that can be determined using a reference signal received from a base station. For example, the UE may receive a configuration from the base station to determine whether the following conditions (UE location and changes in received signal strength) are simultaneously satisfied.

[0151] Table 10

[0152]

[0153] Table 11

[0154]

[0155] Table 11 shows the block error rate (BLER) for loss of synchronization (out of sync) and entry into synchronization (in sync).

[0156] Table 12

[0157]

[0158] Table 13

[0159]

[0160] Table 12 and Table 13 show PDCCH transmission parameters used for synchronization evaluation.

[0161] In various embodiments of the present disclosure, the UE may receive a configuration from the base station to determine whether one or more conditions of the examples [Example Low Mobility 1] to [Example Low Mobility 6] proposed above for determining whether the UE has very low mobility, as well as conditions according to changes in received signal strength, are simultaneously satisfied.

[0162] For example, the UE may receive a configuration to determine not only one or more of the conditions of Examples [Example Low Mobility 1] to [Example Low Mobility 6] set forth above for determining whether the UE has low mobility, but also a condition based on received signal strength that can be determined using a reference signal received from a base station. For example, the UE may receive a configuration from the base station to determine whether the following conditions (mobility condition and condition based on change in received signal strength) are simultaneously satisfied.

[0163] Table 14

[0164]

[0165] Here, S SearchDeltaP-StationaryConnected and T SearchDeltaP-StationaryConnected Indicates the received signal strength threshold and received signal measurement time configured by the base station respectively.

[0166] The synchronization signal-reference signal received power (SS-RSRP) may be an RSRP measurement value of a synchronization signal (SSB) measured by a UE.

[0167] SS-RSRP may be replaced by RSRP measurement of the CSI-RS measured by the UE.

[0168] Table 15

[0169]

[0170] In various embodiments of the present disclosure, the UE can determine whether at least one condition among a series of conditions configured by the base station, for example, [Example Low Mobility 1] to [Example Low Mobility 6], [Example Stationary S] and [Example Stationary S, CSI-RS], is met, and if so, determines that the UE is in a low mobility state and performs power saving operations.

[0171] In various embodiments of the present disclosure, the UE may be a UE with specificity, for example, a reduced capability (RedCap) UE with performance constraints.

[0172] In various embodiments of the present disclosure, the configuration of the threshold and the condition may be a radio signal sent by the base station to the UE, for example, an RRC signal, a medium access control (MAC) signal, or a physical (PHY) signal.

[0173] In various embodiments of the present disclosure, the UE may be a terrestrial network UE (TN UE) or a non-terrestrial network UE (NTN UE) accessing a satellite, and the base station may be a terrestrial base station (TN gNB) or a non-terrestrial network base station such as a satellite (NTN gNB).

[0174] The serving cell mentioned in various embodiments of the present disclosure may be a neighboring cell or a target cell, and may be a group of cells. The serving cell under the conditions configured in the embodiments may also be replaced by a neighboring cell, a target cell, or a group of cells.

[0175] Hereinafter, location-based RRM on / off / relaxation according to various embodiments of the present disclosure is described.

[0176] In an environment where one or more terrestrial networks and non-terrestrial base stations coexist, and when a condition configured by the base station according to the relative distance from the reference location of the cell is met, for power saving, the UE may increase the period of reference signal measurement, turn off the period, reduce the period of reference signal measurement for mobility support, or turn on the period if the period is turned off.

[0177] Figure 6 An environment in which a terrestrial network (TN) and a non-terrestrial network (NTN) coexist and one or more TNs coexist in a relatively large NTN and a UE in the environment are shown.

[0178] refer to Figure 6 The UE may be an NTN-capable UE capable of using both TN and NTN. The gNBs corresponding to the transmitting and receiving terminals of the TN and NTN are connected to the core network by wire or wireless. The gNBs have a physical reference location that the gNBs provide services. The reference location may be indicated as follows.

[0179] - Reference location of the area served by NTN#1 satellite base station (NTN#1 cell):

[0180] - Reference location of the area served by the TN#1 terrestrial base station (TN#1 cell):

[0181] - Reference location of the area served by the TN#2 terrestrial base station (TN#2 cell):

[0182] Furthermore, each base station may have the following distance threshold from each reference location that maps the edge of the service area, according to the physical location difference.

[0183] -Distance threshold of NTN#1 cell:

[0184] -Distance threshold of TN#1 cell:

[0185] -Distance threshold of TN#2 cell:

[0186] Alternatively, each cell may indicate a service area in other methods, and the service area may be shown in the form of a polygon having the reference location list as its vertices, and may have the following reference location list.

[0187] - NTN#1 cell service area vertex reference position list:

[0188] -TN#1 cell service area vertex reference position list:

[0189] -TN#2 cell service area vertex reference position list:

[0190] In this environment, the UE may compare the UE's measurement location with the reference location of each cell and may have each distance as follows.

[0191] -Distance between the UE and the reference location of NTN#1 cell:

[0192] -Distance between the UE and the reference location of TN#1 cell:

[0193] -Distance between the UE and the reference location of TN#2 cell:

[0194] Figure 7 The acquisition of information and triggering events according to various embodiments of the present disclosure are shown.

[0195] refer to Figure 7 , location information (eg, reference locations of terrestrial networks and non-terrestrial networks and reference locations and distance thresholds capable of inferring service areas) may be transmitted from the base station to the UE in the form of a list through the following signal (operation 710).

[0196] -For example, the reference location of the terrestrial network and / or non-terrestrial network and / or the reference location or distance threshold from which the service area can be inferred can be transmitted via a unicast signal transmitted from the serving base station to which the UE is connected to the corresponding UE. For example, as an information element type of an RRC signal, this information can be included in an information signal such as reportconfigNR and transmitted. Alternatively, this information can be included in a MAC signal or a PHY signal and transmitted.

[0197] For example, a reference location of a terrestrial network and / or a non-terrestrial network and / or a reference location or distance threshold from which a service area can be inferred may be included in a broadcast signal (e.g., a system information block (SIB) signal) transmitted from a serving base station to which the UE is connected to the UE and transmitted.

[0198] For example, a reference location of a terrestrial network and / or a non-terrestrial network and / or a reference location or distance threshold from which a service area can be inferred may be included in a multicast signal (e.g., a system information block (SIB) signal) sent from a serving base station to which the UE is connected to the UE and transmitted.

[0199] For example, a reference location of a terrestrial network and / or a non-terrestrial network and / or a reference location or distance threshold from which a service area can be inferred may be included in a broadcast signal (e.g., a system information block (SIB) signal) transmitted from a base station to which the UE is connected to the UE and transmitted.

[0200] The UE may determine whether the event condition is satisfied based on the location information and the event triggering condition (operation 730). Furthermore, if the event triggering condition is satisfied, the UE may perform the corresponding event operation (operation 740). For example, as the UE's location changes, whether base stations belonging to terrestrial networks and non-terrestrial networks can provide services also changes, and this changed situation then serves as a condition for triggering the event and the operations performed by the UE and base station accordingly (e.g., sending a measurement report, performing conditional handover, performing conditional RACH-free handover, performing random access, etc.).

[0201] refer to Figure 7 , the base station may configure events and conditions for triggering each event through a reference signal (e.g., a synchronization sequence block (SSB) or a broadcast system information block (SIB)) or an RRC signal (e.g., an RRCReconfiguration message, etc.) (operation 720). The base station may also provide such information through a MAC signal (e.g., a new MAC-CE) or a PHY signal (e.g., a downlink control signal), etc. Figure 7 In the embodiment, operations 710 and 720 may be described separately, but operations 710 and 720 may be performed through the same message.

[0202] Figure 8 Various distance thresholds for a reference signal measurement operation of a UE according to various embodiments of the present disclosure are shown.

[0203] refer to Figure 8 In addition to the reference locations of the terrestrial networks and non-terrestrial networks adjacent to the UE and the distance threshold from which the service area can be inferred, the base station can also define and configure various distance thresholds for the UE in order to control the reference signal measurement operation of the UE.

[0204] Here, the area in which the reference signal of TN#i needs to be measured to access the terrestrial network cell TN#i is represented as a relative distance threshold corresponding to the reference position of TN#i. The area in which the reference signal of NTN#i needs to be measured to access the non-terrestrial network cell NTN#i is represented as a relative distance threshold corresponding to the reference position of NTN#i. .

[0205] and It can be a value configured by the base station for the UE and can be obtained by dividing the coverage threshold by and Add the distance constant and The values obtained, for example, and The threshold and distance can be positive or negative.

[0206] according to Figure 7 Processes such as 、 、 or The threshold value of can be configured for the UE by the base station through a reference signal (e.g., synchronization sequence block (SSB) or broadcast system information block (SIB)) or an RRC signal (e.g., an RRCReconfiguration message, etc.). The base station can also provide such information through a MAC signal (e.g., a new MAC-CE) or a PHY signal (e.g., a downlink control signal, etc.). In addition, such as 、 、 or The threshold value may be pre-input information that the UE has learned from the manufacturer.

[0207] In this environment, the UE can determine a specific location through the reference locations of neighboring terrestrial networks and non-terrestrial networks and the reference location or distance threshold from which the service area can be inferred, and based on this determination, the reference signal measurement can be turned on or off or the measurement period can be increased or decreased. For example:

[0208] -When the UE is at a distance from the TN cell i In the case of a TN cell ID of i (for example, in the case where the TN cell ID is i), the UE can determine a specific location as follows, and perform an operation of starting measurement of reference signals of the corresponding TN cell i, all TN cells, or all cells, or an operation of reducing the measurement cycle, so as to effectively support mobility.

[0209] ■ : The distance between the UE and TN cell i is within the configured threshold

[0210] ■ : The distance between the UE and TN cell i is within the configured threshold and is also within the coverage of NTN cell j

[0211] ■ : The distance between the UE and TN cell i is within the configured threshold and also within the threshold of NTN cell j

[0212] - In the case where the UE is not around any TN cell, the UE may determine a specific location as follows and perform an operation of turning off measurement of reference signals of all TN cells or all cells or increasing a measurement cycle in order to save power.

[0213] ■ : The distance between the UE and all TN cells exceeds the configured threshold

[0214] ■ : The distance between the UE and all TN cells exceeds the configured threshold and the UE is also within the coverage of NTN cell j

[0215] ■ : The distance between the UE and all TN cells exceeds the configured threshold and also exists within the threshold of NTN cell j

[0216] In the above description and The hysteresis value used for the determination may be configured by the network and may have the same units as the distance.

[0217] i. The UE may compare the distance threshold of each cell with the distance between the UE and the reference location of each cell in order to trigger an event.

[0218] 1.

[0219] ii. The UE may store the distance threshold of each cell, the distance between the UE and the reference position of each cell, the absolute position of the UE ( ), and the absolute area of each cell obtained by the reference position list of the service area vertices of each cell ( ) to trigger the event. Here, the absolute area of each cell ( ) is a polygon drawn by using straight lines with the reference locations of the service area vertices of each cell as vertices.

[0220] 1.

[0221] In addition, the UE can simultaneously consider the following event triggering conditions based on signal strength measurement. For example, when the base station is configured with one or more of the above location-based conditions and the following signal strength measurement conditions, the UE can trigger an event if all conditions are met.

[0222] i.A2: The received signal strength of the terrestrial network serving cell is equal to or lower than a predetermined threshold configured by the base station

[0223] 1.Ms + Hys < Thresh

[0224] A.Ms is the measurement result of the serving cell without considering any offset.

[0225] B. Hys is the hysteresis parameter for this event (ie, hysteresis as defined within reportConfigNR for this event).

[0226] C.Thresh is the threshold parameter for this event (ie, a2-Threshold as defined within reportConfigNR for this event).

[0227] D.Ms is expressed in dBm in the case of RSRP, or in dB in the case of RSRQ and RS-SINR.

[0228] E.Hys is expressed in dB.

[0229] F.Thresh is expressed in the same units as Ms.

[0230] ii. A2': The received signal strength of all terrestrial cells is equal to or lower than the predetermined threshold configured by the base station

[0231] 2. Ms(i)+ Hys < Thresh

[0232] G.Ms(i) is the measurement result of cell i without considering any offset.

[0233] H.Hys is the hysteresis parameter for this event (ie, hysteresis as defined in reportConfigNR for this event).

[0234] I.Thresh is the threshold parameter for this event (ie, a2-Threshold as defined within reportConfigNR for this event).

[0235] J. Ms is expressed in dBm in the case of RSRP, or in dB in the case of RSRQ and RS-SINR.

[0236] K.Hys is expressed in dB.

[0237] L.Thresh is expressed in the same unit as Ms.

[0238] iii.A1': The received signal strength of the non-terrestrial network (NT) cell is equal to or lower than the predetermined threshold configured by the base station

[0239] 3.Ms(j) - Hys > Thresh

[0240] M.Ms(j) is the measurement result of cell j without considering any offset.

[0241] N.Hys is the hysteresis parameter for this event (ie, hysteresis as defined within reportConfigNR for this event).

[0242] O.Thresh is the threshold parameter for this event (ie, a2-Threshold as defined within reportConfigNR for this event).

[0243] P.Ms is expressed in dBm in the case of RSRP, or in dB in the case of RSRQ and RS-SINR.

[0244] Q.Hys is expressed in dB.

[0245] R.Thresh is expressed in the same unit as Ms.

[0246] iv.A3': The received signal strength of the neighboring non-terrestrial network (NTN) cell is equal to or higher than the received signal strength of the terrestrial network serving cell, which is equal to or higher than the predetermined threshold configured by the base station.

[0247] 4.Mn + Ofn + Ocn - Hys > Mp + Ofp + Ocp + Off

[0248] S.Mn is the measurement result of the neighboring (NTN) cell without considering any offset.

[0249] T.Ofn is the measurement object specific offset of the reference signal of the neighboring (NTN) cell (ie, offsetMO as defined within measObjectNR corresponding to the neighboring cell).

[0250] U.Ocn is the cell specific offset of the neighboring (NTN) cell (ie cellIndividualOffset as defined within measObjectNR corresponding to the frequency of the neighboring cell) and is set to zero if not configured for the neighboring cell.

[0251] V.Mp is the measurement result of (TN)SpCell without considering any offset.

[0252] W.Ofp is the measurement object specific offset of the (TN)SpCell (ie, offsetMO as defined within the measObjectNR corresponding to the SpCell).

[0253] X.Ocp is the cell specific offset of the (TN)SpCell (ie cellIndividualOffset as defined within the measObjectNR corresponding to the SpCell) and is set to zero if not configured for the SpCell.

[0254] Y.Hys is the hysteresis parameter for this event (ie, hysteresis as defined within reportConfigNR for this event).

[0255] Z.Off is the offset parameter of this event (ie, a3-Offset as defined within reportConfigNR for this event).

[0256] AA.Mn, Mp are expressed in dBm in the case of RSRP, or in dB in the case of RSRQ and RS-SINR.

[0257] BB.Ofn, Ocn, Ofp, Ocp, Hys and Off are expressed in dB.

[0258] v.A3'': The received signal strength of the neighboring non-terrestrial network (NTN) cell is equal to or higher than the configured received signal strength of all terrestrial network serving cells by a predetermined threshold configured by the base station.

[0259] 5.Mn + Ofn + Ocn -Hys > Mp(i)+ Ofp(i)+ Ocp(i)+ Off

[0260] CC.Mn is the measurement result of the neighboring (NTN) cell without considering any offset.

[0261] DD.Ofn is the measurement object specific offset of the reference signal of the neighboring (NTN) cell (ie, offsetMO as defined within measObjectNR corresponding to the neighboring cell).

[0262] EE.Ocn is the cell specific offset of the neighboring (NTN) cell (ie cellIndividualOffset as defined within measObjectNR corresponding to the frequency of the neighboring cell) and is set to zero if not configured for the neighboring cell.

[0263] FF.Mp(i) is the measurement result of (TN)SpCell i without considering any offset.

[0264] GG.Ofp(i) is the measurement object specific offset of (TN)SpCell i (ie, offsetMO as defined within the measObjectNR corresponding to the SpCell).

[0265] HH.Ocp(i) is the cell specific offset of (TN)SpCell i (ie, cellIndividualOffset as defined within measObjectNR corresponding to the SpCell) and is set to zero if not configured for the SpCell.

[0266] II. Hys is the hysteresis parameter of this event (ie, hysteresis as defined in reportConfigNR for this event).

[0267] JJ.Off is the offset parameter of this event (ie, a3-Offset as defined within reportConfigNR for this event).

[0268] KK.Mn, Mp are expressed in dBm in the case of RSRP, or in dB in the case of RSRQ and RS-SINR.

[0269] LL.Ofn, Ocn, Ofp, Ocp, Hys and Off are expressed in dB.

[0270] B. In addition, the UE may simultaneously consider the following event triggering conditions based on time measurement. For example, when the base station is configured with one or more of the above location-based conditions, signal strength measurement conditions, and time measurement conditions, the UE may trigger an event if all conditions are met.

[0271] i. T1: The time when the UE is equal to or greater than the predetermined threshold configured by the base station

[0272] 1.Mt > Thresh1

[0273] A. Mt is the time measured at the UE.

[0274] B. Thresh1 is the threshold parameter for this event (ie, t1-Threshold as defined within reportConfigNR for this event).

[0275] C.Duration is the duration parameter of this event (ie, the duration as defined in reportConfigNR for this event).

[0276] D.Mt is expressed in milliseconds.

[0277] E.Thresh1 is expressed in the same unit as Mt.

[0278] F.Duration is expressed in the same unit as Mt

[0279] ii. T1': The time when the UE is equal to or less than the predetermined threshold configured by the base station

[0280] 1.Mt < Thresh1

[0281] A. Mt is the time measured at the UE.

[0282] B. Thresh1 is the threshold parameter for this event (ie, t1-Threshold as defined within reportConfigNR for this event).

[0283] C.Duration is the duration parameter of this event (ie, the duration as defined in reportConfigNR for this event).

[0284] D.Mt is expressed in milliseconds.

[0285] E.Thresh1 is expressed in the same unit as Mt.

[0286] F. Duration is expressed in the same units as Mt

[0287] C. The UE can determine various events supported by the UE and the standard, such as Event A based on signal strength measurement, Event B through inter-RAT measurement, or Event I through interference measurement, as well as various events other than the above event determination conditions, and trigger the event. The event conditions can be configured by the base station.

[0288] 2. Determined by the following location conditions, the UE may trigger events, for example, such as sending a measurement report, performing a conditional handover to a terrestrial network, performing a conditional RACH-less handover to a terrestrial network, and performing a random access to a terrestrial network.

[0289] A. The UE may determine that the UE is included in the service area of a terrestrial network (TN) cell i and trigger an event as follows.

[0290] i. The UE may compare the distance threshold of each cell with the distance between the UE and the reference location of each cell in order to trigger an event.

[0291] 1. Find contentment The "i" of "i" and trigger events for all "i"

[0292] 2. Find contentment The "i" of ", and in the case of one or more "i", additionally determine the following conditions

[0293] A. Choose The "i" and trigger the event

[0294] B. Select "i" with the best received signal strength performance (with the largest RSRP, RSRQ, RSSI, CQI, SINR or SNR) and trigger the event

[0295] ii. The UE may store the distance threshold of each cell, the distance between the UE and the reference position of each cell, the absolute position of the UE ( ), and the absolute area of each cell obtained by the reference position list of the service area vertices of each cell ( ) to trigger the event. Here, the absolute area of each cell ( ) is a polygon drawn by using straight lines with the reference locations of the service area vertices of each cell as vertices.

[0296] 1. Find contentment "i" and trigger events for all "i"

[0297] 2. Find contentment The "i" of ", and in the case of one or more "i", additionally determine the following conditions

[0298] A. Select the one with the minimum The "i" and trigger the event

[0299] B. Select "i" with the best received signal strength performance (with the largest RSRP, RSRQ, RSSI, CQI, SINR or SNR) and trigger the event

[0300] B. In addition, the UE may simultaneously consider the following event triggering conditions based on signal strength measurement. For example, when the base station is configured with one or more of the above location-based conditions and the following signal strength measurement conditions, the UE may trigger an event if all conditions are met.

[0301] i.A2: The received signal strength of the non-terrestrial network serving cell is equal to or lower than the predetermined threshold configured by the base station

[0302] 1.Ms + Hys < Thresh

[0303] A.Ms is the measurement result of the serving cell without considering any offset.

[0304] B. Hys is the hysteresis parameter for this event (ie, hysteresis as defined within reportConfigNR for this event).

[0305] C.Thresh is the threshold parameter for this event (ie, a2-Threshold as defined within reportConfigNR for this event).

[0306] D.Ms is expressed in dBm in the case of RSRP, or in dB in the case of RSRQ and RS-SINR.

[0307] E.Hys is expressed in dB.

[0308] F.Thresh is expressed in the same units as Ms.

[0309] ii.A1': The received signal strength of the terrestrial network (TN) cell is equal to or higher than the predetermined threshold configured by the base station

[0310] 1. (Ms(i) - Hys > Thresh)

[0311] A. Ms(j) is the measurement result of cell j without considering any offset.

[0312] B. Hys is the hysteresis parameter for this event (ie, hysteresis as defined within reportConfigNR for this event).

[0313] C.Thresh is the threshold parameter for this event (ie, a2-Threshold as defined within reportConfigNR for this event).

[0314] D.Ms is expressed in dBm in the case of RSRP, or in dB in the case of RSRQ and RS-SINR.

[0315] E.Hys is expressed in dB.

[0316] F.Thresh is expressed in the same units as Ms.

[0317] iii.A3': The received signal strength of the neighboring terrestrial network (TN) cell is equal to or higher than the received signal strength of the non-terrestrial network serving cell by a predetermined threshold configured by the base station.

[0318] 1.Mn + Ofn + Ocn - Hys > Mp + Ofp + Ocp + Off

[0319] A.Mn is the measurement result of the neighboring (TN) cells without considering any offset.

[0320] B.Ofn is the measurement object specific offset of the reference signal of the neighboring (TN) cell (ie, offsetMO as defined within measObjectNR corresponding to the neighboring cell).

[0321] C.Ocn is the cell specific offset of the neighboring (TN) cell (ie cellIndividualOffset as defined within measObjectNR corresponding to the frequency of the neighboring cell) and is set to zero if not configured for the neighboring cell.

[0322] D.Mp is the measurement result of (NTN)SpCell without considering any offset.

[0323] E.Ofp is the measurement object specific offset of the (NTN)SpCell (ie, offsetMO as defined within the measObjectNR corresponding to the SpCell).

[0324] F.Ocp is the cell specific offset of the (NTN)SpCell (ie, cellIndividualOffset as defined within the measObjectNR corresponding to the SpCell) and is set to zero if not configured for the SpCell.

[0325] G.Hys is the hysteresis parameter for this event (ie, hysteresis as defined within reportConfigNR for this event).

[0326] H.Off is the offset parameter of this event (ie, a3-Offset as defined within reportConfigNR for this event).

[0327] I. Mn, Mp are expressed in dBm in the case of RSRP, or in dB in the case of RSRQ and RS-SINR.

[0328] J.Ofn, Ocn, Ofp, Ocp, Hys and Off are expressed in dB.

[0329] C. In addition, the UE may simultaneously consider the following event triggering conditions based on time measurement. For example, when the base station is configured with one or more of the above location-based conditions, signal strength measurement conditions, and time measurement conditions, the UE may trigger an event if all conditions are met.

[0330] i. T1: The time when the UE is equal to or greater than the predetermined threshold configured by the base station

[0331] 1.Mt > Thresh1

[0332] A. Mt is the time measured at the UE.

[0333] B. Thresh1 is the threshold parameter for this event (ie, t1-Threshold as defined within reportConfigNR for this event).

[0334] C.Duration is the duration parameter of this event (ie, the duration as defined in reportConfigNR for this event).

[0335] D.Mt is expressed in milliseconds.

[0336] E.Thresh1 is expressed in the same unit as Mt.

[0337] F.Duration is expressed in the same unit as Mt

[0338] ii. T1': The time when the UE is equal to or lower than the predetermined threshold configured by the base station

[0339] 1.Mt < Thresh1

[0340] A. Mt is the time measured at the UE.

[0341] B. Thresh1 is the threshold parameter for this event (ie, t1-Threshold as defined within reportConfigNR for this event).

[0342] C.Duration is the duration parameter of this event (ie, the duration as defined in reportConfigNR for this event).

[0343] D.Mt is expressed in milliseconds.

[0344] E.Thresh1 is expressed in the same unit as Mt.

[0345] F.Duration is expressed in the same unit as Mt

[0346] D. The UE can determine various events supported by the UE and the standard, such as Event A based on signal strength measurement, Event B through inter-RAT measurement, or Event I through interference measurement, as well as various events other than the above event determination conditions, and trigger the event. The event conditions can be configured by the base station.

[0347] Inequality signs, including inequality signs and equality signs used in any embodiment presented in this disclosure, may be replaced interchangeably. For example, > may be replaced with ≥, < may be replaced with ≤, ≥ may be replaced with >, and ≤ may be replaced with <.

[0348] In various embodiments of the present disclosure, a UE is described in which it determines an event condition and performs a reference signal measurement relaxation operation or a power saving operation. This may include not only the UE determining the event condition and immediately performing a corresponding operation, but also the UE determining whether the event condition is satisfied and, based on an indication or signaling from a base station, performing the reference signal measurement relaxation operation or the power saving operation if the event condition is satisfied and reported to the base station.

[0349] Figure 9 The structure of a base station according to an embodiment of the present disclosure is shown.

[0350] refer to Figure 9 , the base station may include a transceiver 910, a controller 920, and a storage component 930. The transceiver 910, the controller 920, and the storage component 930 may operate according to the communication method of the above-mentioned base station. In addition, the network device may also correspond to the structure of the base station. However, the components of the base station are not limited to the above examples. For example, the base station may include a greater or lesser number of components than those described above. For example, the base station may include a transceiver 910 and a controller 920. In addition, the transceiver 910, the controller 920, and the storage component 930 may be implemented in the form of a single chip.

[0351] The transceiver 910 generally refers to a base station receiver and a base station transmitter, and can transmit and receive signals with UEs, other base stations, and other network devices. The transmitted and received signals may include control information and data. The transceiver 910 can transmit, for example, system information, synchronization signals, or reference signals to the UE. To this end, the transceiver 910 may include a radio frequency (RF) transmitter configured to up-convert and amplify the frequency of transmitted signals, an RF receiver configured to perform low-noise amplification and down-convert the frequency of received signals, and the like. However, this is merely an embodiment of the transceiver 910, and the components of the transceiver 910 are not limited to RF transmitters and RF receivers. The transceiver 910 may include a wired or wireless transceiver and may include various components for transmitting and receiving signals. Furthermore, the transceiver 910 may receive signals via a communication channel (e.g., a radio channel), output these signals to the controller 920, and transmit signals output from the controller 920 via the communication channel. In addition, the transceiver 910 may receive a communication signal, output it to the processor, and transmit the signal output from the processor to a UE, other base stations, or other network entities through a wired / wireless network.

[0352] The storage component 930 can store programs and data required for base station operation. In addition, the storage component 930 can store control information or data included in the signal obtained by the base station. The storage component 930 can include a storage medium such as ROM, RAM, hard disk, CD-ROM, DVD, etc., or a combination of storage media. In addition, the storage component 930 can store at least one of information transmitted / received by the transceiver 910 and information generated by the controller 920.

[0353] As used herein, the controller 920 can be defined as a circuit, an application-specific integrated circuit, or at least one processor. The processor may include a communication processor (CP) that performs communication control and an application processor (AP) that controls upper layers such as application programs. The controller 920 may control the overall operation of the base station according to the embodiments of the present disclosure. For example, the controller 920 may control the signal flow between various blocks to perform operations according to the above-described flowchart.

[0354] Figure 10 The structure of a UE according to an embodiment of the present disclosure is shown.

[0355] refer to Figure 10, the UE may include a transceiver 1010, a controller 1020, and a storage component 1030. The transceiver 1010, the controller 1020, and the storage component 1030 may operate according to the communication method of the UE described above. The components of the UE are not limited to the above examples. For example, the UE may include a greater or lesser number of components than the above components. For example, the UE may include the transceiver 1010 and the controller 1020. In addition, the transceiver 1010, the controller 1020, and the storage component 1030 may be implemented in the form of a single chip.

[0356] The transceiver 1010 generally refers to a UE receiver and a UE transmitter, and can transmit and receive signals with a base station, other UEs, and other network entities. Signals transmitted and received with a base station may include control information and data. The transceiver 1010 may, for example, receive system information, synchronization signals, or reference signals from the base station. To this end, the transceiver 1010 may include an RF transmitter configured to up-convert and amplify the frequency of a transmitted signal, an RF receiver configured to perform low-noise amplification and down-convert the frequency of a received signal, and the like. However, this is merely an embodiment of the transceiver 1010, and the components of the transceiver 1010 are not limited to an RF transmitter and an RF receiver. Furthermore, the transceiver 1010 may include a wired / wireless transceiver and may include various components for transmitting and receiving signals. Furthermore, the transceiver 1010 may receive signals via a radio channel, output them to the controller 1020, and transmit signals output from the controller 1020 via a radio channel. In addition, the transceiver 1010 may receive a communication signal, output it to the processor, and transmit the signal output from the processor to a network entity through a wired / wireless network.

[0357] The storage component 1030 can store programs and data required for UE operation. In addition, the storage component can store control information or data included in the signal obtained by the UE. The storage component 1030 can include storage media such as ROM, RAM, hard disk, CD-ROM and DVD, or a combination of storage media.

[0358] As used herein, the controller 1020 can be defined as a circuit, an application-specific integrated circuit, or at least one processor. The processor may include a communication processor (CP) that performs communication control and an application processor (AP) that controls upper layers such as application programs. The controller 1020 may control the overall operation of the UE according to the embodiments of the present disclosure. For example, the controller 1020 may control the signal flow between various blocks to perform operations according to the above-described flowchart.

[0359] The methods disclosed in the claims and / or the methods according to the embodiments described in the specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0360] When implementing the method via software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors within an electronic device. At least one program includes instructions that cause the electronic device to perform the method according to the various embodiments of the present disclosure as defined in the appended claims and / or disclosed herein.

[0361] These programs (software modules or software) may be stored in non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage, compact disc-ROM (CD-ROM), digital versatile disc (DVD) or other types of optical storage devices or magnetic tape cassettes. Alternatively, any combination of some or all of them may form the memory in which the programs are stored. Furthermore, a plurality of such memories may be included in the electronic device.

[0362] Furthermore, the program may be stored on an attachable storage device that is accessible to the electronic device via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide LAN (WLAN), and a storage area network (SAN), or a combination thereof. Such a storage device may be connected to the electronic device via an external port. Furthermore, a separate storage device on a communication network may be connected to the portable electronic device.

[0363] In the above detailed embodiments of the present disclosure, the elements included in the present disclosure are expressed in the singular or plural, depending on the detailed embodiment presented. However, the singular or plural form is appropriately selected for ease of description for the presented situation, and the present disclosure is not limited to the elements expressed in the singular or plural. Therefore, an element expressed in the plural may also include a single element, or an element expressed in the singular may also include multiple elements.

[0364] Although specific embodiments have been described in the detailed description of the present disclosure, it is apparent that various modifications and changes can be made thereto without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be defined as being limited to the embodiments set forth herein, but should be defined by the appended claims and their equivalents.

Claims

1. A method for a terminal in a wireless communication system, the method comprising: receiving, from a base station of a non-terrestrial network, reference location information of a cell operated by the base station; determining whether a trigger condition for performing an operation for power saving is satisfied based on the reference location information; as well as When the trigger condition is met, the operation for power saving is performed. 2 . The method according to claim 1 , wherein at least one of a first condition based on mobility of the terminal and a second condition based on a location of the terminal within the cell is configured as the trigger condition from the base station. 3 . The method according to claim 2 , wherein the first condition corresponds to determining low mobility of the terminal based on the reference location information, the location of the terminal, and first threshold information. 4 . The method according to claim 2 , wherein the second condition corresponds to determining whether the terminal is located at an edge of the cell based on the reference location information, the location of the terminal, and second threshold information. 5 . The method according to claim 1 , wherein the operation for power saving comprises at least one of an operation of increasing a radio resource management (RRM) measurement period and an operation of increasing a radio link monitoring (RLM) monitoring period. 6 . The method according to claim 2 , wherein at least one of the first condition and the second condition is determined by further considering reference signal received power (RSRP) or reference signal received quality (RSRQ) measured by the terminal.

7. The method according to claim 6, wherein if the terminal satisfies a low mobility condition and a signal strength condition based on synchronization signal-reference signal received power (SS-RSRP) of a serving cell, a measurement relaxation operation for power saving is performed. The method according to claim 1 , wherein the reference position information corresponds to a value that changes over time.

9. A terminal of a wireless communication system, the terminal comprising: transceiver; and controller, The controller is configured to: receiving, from a base station of a non-terrestrial network, reference location information of a cell operated by the base station; determining whether a trigger condition for performing an operation for power saving is satisfied based on the reference location information; as well as When the trigger condition is met, the terminal is controlled to perform the operation for power saving. 10 . The terminal according to claim 9 , wherein at least one of a first condition based on mobility of the terminal and a second condition based on a location of the terminal within the cell is configured as the trigger condition from the base station. 11 . The terminal according to claim 10 , wherein the first condition corresponds to determining low mobility of the terminal based on the reference location information, the location of the terminal, and first threshold information. 12 . The terminal according to claim 10 , wherein the second condition corresponds to determining whether the terminal is located at an edge of the cell based on the reference location information, the location of the terminal, and second threshold information.

13. The terminal according to claim 9, wherein the operation for power saving comprises at least one of an operation of increasing a radio resource management (RRM) measurement period and an operation of increasing a radio link monitoring (RLM) monitoring period.

14. The terminal according to claim 10, wherein at least one of the first condition and the second condition is determined by further considering reference signal received power (RSRP) or reference signal received quality (RSRQ) measured by the terminal, and Wherein, when the terminal meets a low mobility condition and a signal strength condition based on synchronization signal-reference signal received power SS-RSRP of a serving cell, a measurement relaxation operation for power saving is performed. The terminal according to claim 9 , wherein the reference location information corresponds to a value that changes with time.

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