Method and device for transmitting information in wireless communication system using non-terrestrial network

Abstract

An operation method of a first network entity (e.g., an NMF) according to an embodiment of the present disclosure may comprise the steps of: identifying that a non-terrestrial network communication node connected to a first base station is changed from a first node to a second node; determining whether information about the second node is stored; and transmitting the information about the second node to the first base station on the basis of whether the information about the second node is stored.

Description

Method and device for transmitting information in a wireless communication system using a non-terrestrial network

[0001] The present disclosure relates to a method and device for transmitting information about a non-terrestrial network (NTN) communication node in a wireless communication system using a non-terrestrial network, and more particularly, to a method and device for signaling related information when information about a non-terrestrial network communication node connected to a base station is changed.

[0002] Looking back at the evolution of wireless communication over successive generations, technologies have primarily been developed for human-facing services such as voice, multimedia, and data. With the commercialization of the 5G (5th Generation) communication system, an explosive increase in connected devices is expected to be connected to communication networks. Examples of networked objects include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction equipment, and factory equipment. Mobile devices are also expected to evolve into diverse form factors, such as augmented reality glasses, virtual reality headsets, and holographic devices. In the 6G (6th Generation) era, efforts are being made to develop improved 6G communication systems to connect hundreds of billions of devices and objects and provide diverse services. For this reason, 6G communication systems are often referred to as "beyond 5G."

[0003] The 6G communication system, expected to be realized around 2030, will have a maximum transmission speed of terabytes (i.e., 1,000 gigabits) per second (bps) and a wireless latency of 100 microseconds (μsec). In other words, compared to 5G, the transmission speed in a 6G communication system will be 50 times faster and the wireless latency will be reduced to one-tenth.

[0004] To achieve these high data rates and ultra-low latency, 6G communication systems are being considered for implementation in the terahertz (THz) band (e.g., from 95 gigahertz (GHz) to 3 terahertz (THz)). Compared to the millimeter wave (mmWave) band introduced in 5G, the terahertz band is expected to have more severe path loss and atmospheric absorption, making it more important to develop technologies that can guarantee signal reach, or coverage. Key technologies to ensure coverage include Radio Frequency (RF) components, antennas, new waveforms that offer better coverage than Orthogonal Frequency Division Multiplexing (OFDM), beamforming, and multiple antenna transmission technologies such as massive Multiple-Input and Multiple-Output (MIMO), Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas. In addition, new technologies such as metamaterial-based lenses and antennas, high-dimensional spatial multiplexing using Orbital Angular Momentum (OAM), and Reconfigurable Intelligent Surface (RIS) are being discussed to improve the coverage of terahertz band signals.

[0005] In addition, in order to improve frequency efficiency and system network, 6G communication systems are developing full duplex technology that utilizes the same frequency resources at the same time for uplink and downlink; network technology that integrates satellites and HAPS (High-Altitude Platform Stations); network structure innovation technology that supports mobile base stations and enables optimization and automation of network operation; dynamic spectrum sharing technology through collision avoidance based on spectrum usage prediction; AI-based communication technology that utilizes AI (Artificial Intelligence) from the design stage and internalizes end-to-end AI support functions to realize system optimization; and next-generation distributed computing technology that realizes services with complexity that exceeds the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources (Mobile Edge Computing (MEC), cloud, etc.). In addition, efforts are being made to further strengthen connectivity between devices, further optimize networks, promote softwareization of network entities, and increase the openness of wireless communications through the design of new protocols to be used in 6G communication systems, the implementation of hardware-based security environments, the development of mechanisms for the safe use of data, and the development of technologies for maintaining privacy.

[0006] Research and development of these 6G communication systems are expected to enable a new level of hyper-connected experience through the hyper-connectivity of 6G communication systems, which encompass not only connections between things but also connections between people and things. Specifically, 6G communication systems are expected to enable services such as truly immersive eXtended Reality (XR), high-fidelity mobile holograms, and digital replicas. Furthermore, services such as remote surgery, industrial automation, and emergency response, which are provided through 6G communication systems through enhanced security and reliability, will be applied in diverse fields such as industry, medicine, automobiles, and home appliances.

[0007] The present disclosure relates to non-terrestrial network (NTN) communication that can provide communication services in areas where communication services are unavailable (e.g., ocean, polar regions, remote areas, airspace, etc.) by utilizing non-terrestrial network communication nodes (e.g., satellites, HAPS, UAM, or drones). HAPS (High-Altitude Platform Station) is an unmanned airship carrying communication and broadcasting equipment and other wireless application equipment at an altitude of 20 to 30 km above the ground, and refers to a device that can be used for mobile communication, broadcasting relay, remote sensing, radio surveillance, weather observation, etc., and UAM (Urban Air Mobility) can refer to an aircraft that can transport people or cargo in the sky above a city.

[0008] Non-terrestrial network communication can utilize communication nodes such as satellites as relays to establish communication areas in areas where it is physically or economically impossible to install base stations for communication.

[0009] Satellites that can be used in non-terrestrial networks (NTN) can be classified into Geostationary Earth Orbit (GEO) satellites, Medium Earth Orbit (MEO) satellites, and Low Earth Orbit (LEO) satellites, depending on the altitude of the satellite's orbit. In the case of non-terrestrial networks using LEO satellites, LEO satellites exist at a lower altitude (200 km to 2,000 km) than other satellites (GEO, MEO), so the radio round-trip time is short, resulting in less delay. However, LEO satellites have a faster speed than other satellites (GEO, MEO) (approximately 7.56 km / s at an altitude of 600 km), so they have the characteristic of constantly changing frequency / time synchronization in stationary terminals or satellite antennas. Therefore, the terminal needs to calculate and compensate for the synchronization change due to the mobility of the satellite.

[0010] 3GPP(3 rdIn the case of the GNSS Generation Partnership Project (GNSS) standard, in relation to non-terrestrial network communication, standardization has been carried out so that when a terminal connects to a base station via satellite, it can connect to the base station after partially self-correcting the frequency and time synchronization. In order for the terminal to correct the frequency and time synchronization, information related to the terminal's location and mobility as well as the satellite's location and mobility are essential. The terminal can measure the terminal's mobility and location information using the Global Navigation Satellite System (GNSS) and use the measurement results for frequency and time synchronization correction and terminal mobility management. In addition, the terminal can receive and use information such as the satellite's location and mobility through the system information block (SIB) information included in the broadcast message from the base station connected to the satellite.

[0011] Meanwhile, the Terrestrial Network (TN) can communicate through a cellular network installed and managed by a telecommunications company from the terminal to the Core Network (CN). Therefore, all communication networks can be managed by the telecommunications company's servers, and generally, the telecommunications company's related servers can be designed according to 3GPP standards. In contrast, in the case of wireless communication using a non-terrestrial network, some sections of the communication path from the terminal to the CN include networks other than the telecommunications company's network. For example, there may be a non-terrestrial network gateway (NTN gateway) and non-terrestrial network communication nodes (or non-terrestrial network entities) (NTN NEs) such as satellites, high-altitude platform stations (HAPS), urban air mobility (UAM), and drones between the base station and the terminal.

[0012] Non-terrestrial network communication nodes (or entities) can be managed by the management server of the telecommunications company, or by a separate system managed by an entity other than the telecommunications company (e.g., an entity managing a satellite network). If the non-terrestrial network communication nodes are managed by an entity other than the telecommunications company that manages the terrestrial network, it is difficult for the non-terrestrial network section to be managed by the core network. Therefore, there is a need to link the management system for managing the section composed of the non-terrestrial network with the terrestrial network system. Therefore, to link the non-terrestrial network management system with the terrestrial network system, the CU (Central Unit) of the base station receives mobility information (e.g., orbit information) of the non-terrestrial network communication node (or entity) (e.g., satellite) from an external non-terrestrial network management service (or server) that builds and manages the non-terrestrial network, calculates the orbit based on the information, and then calculates and uses the current position and velocity of the non-terrestrial network communication node. Then, the base station can select a satellite linked to the base station and form a cell based on the selected satellite.

[0013] However, as thousands of satellites orbit the Earth, increasing the number of connectable satellites to tens or hundreds, and as satellites dynamically form cells using rotatable antennas, base stations must process orbital information for numerous satellites and continuously receive information on cell formation methods and status from external non-terrestrial network management servers. Furthermore, various devices that can be considered non-terrestrial network communication nodes, such as High-Altitude Platform Stations (HAPS), Urban Air Mobility (UAM), or drones, unlike satellites, do not have fixed orbits. Therefore, base stations must receive path information from external non-terrestrial network management servers at regular intervals, and need to receive more data at a higher frequency than satellites. However, in the prior art, a signaling method for exchanging this information has not been defined, and the Operation and Management (OAM) in the Management Plane must receive this information from an external non-terrestrial network management server and transmit it to the base station. However, in this case, the external non-terrestrial network management server and OAM transmit and receive through a public network, and it is difficult to guarantee the performance of the transmission and reception network between the OAM and the base station, so the transmission and reception of information may be delayed, and the operation of the terminal for accessing the non-terrestrial network cell (such as initial access or handover) may be delayed.

[0014] The same problem as mentioned above has a greater impact on communication quality as the size of the data volume containing information increases, the stability of the information transmission path (e.g., retransmission rate, packet drop rate, etc.) decreases, and the distance of the information transmission path increases, and there is a need for technology to improve this.

[0015] The present disclosure may have as its primary purpose a method and device for transmitting information about a non-terrestrial network communication node in a wireless communication system using a non-terrestrial network.

[0016] In addition, the present disclosure may have as its purpose a method and device for efficiently transmitting information by storing, managing, and reusing information about a non-terrestrial network communication node.

[0017] In addition, the present disclosure may have as its purpose a method and device for efficiently transmitting information by transmitting information about non-terrestrial network communication nodes between base stations.

[0018] In addition, the present disclosure may have as its purpose a method and device for minimizing delay time by transmitting information about a non-terrestrial network communication node through a control plane.

[0019] A method according to one embodiment of the present disclosure is an operation method of a first network entity (NTN Management Function, NMF) in a wireless communication system, comprising: an operation of identifying that a non-terrestrial network communication node connected to a first base station has changed from a first node to a second node; an operation of determining whether information about the second node is stored; and an operation of transmitting information about the second node to the first base station based on whether information about the second node is stored.

[0020] A method and device according to one embodiment of the present disclosure can efficiently transmit information by storing, managing, and reusing information about a non-terrestrial network communication node in a wireless communication system (e.g., a 5G NR system).

[0021] In addition, the method and device according to one embodiment of the present disclosure can efficiently transmit information even when the distance between the CN and the base station is very long by transmitting information about the non-terrestrial network communication node between base stations.

[0022] In addition, the method and device according to one embodiment of the present disclosure can minimize delay time and improve reliability of information transmission by transmitting information about a non-terrestrial network communication node through a control plane.

[0023] In addition, the method and device according to one embodiment of the present disclosure can efficiently transmit information about a non-terrestrial network communication node, thereby allowing a base station to broadcast changed SIB (system information block) information and a terminal to access a non-terrestrial network cell based on the changed SIB information, thereby improving the quality of wireless communication using a non-terrestrial network.

[0024] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0025] The features and advantages of one embodiment of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings.

[0026] FIG. 1a is a diagram illustrating a quasi-earth fixed cell according to one embodiment of the present disclosure.

[0027] FIG. 1b is a drawing for explaining an Earth moving cell according to one embodiment of the present disclosure.

[0028] FIG. 2a and FIG. 2b illustrate a system in which a terrestrial network and a non-terrestrial network are interconnected according to one embodiment of the present disclosure.

[0029] FIG. 3 illustrates a system in which a terrestrial network and a non-terrestrial network are interconnected according to one embodiment of the present disclosure.

[0030] FIG. 4 illustrates a system in which a terrestrial network and a non-terrestrial network are interconnected according to one embodiment of the present disclosure.

[0031] FIG. 5 illustrates a system for transmitting information to a non-terrestrial network communication node according to one embodiment of the present disclosure.

[0032] FIG. 6 illustrates an information transmission method according to one embodiment of the present disclosure.

[0033] Figure 7 illustrates an information transmission method according to one embodiment of the present disclosure.

[0034] FIG. 8 illustrates a system for transmitting information to a non-terrestrial network communication node according to one embodiment of the present disclosure.

[0035] Figure 9 illustrates an information transmission method according to one embodiment of the present disclosure.

[0036] FIG. 10 illustrates a system for transmitting information to a non-terrestrial network communication node according to one embodiment of the present disclosure.

[0037] FIG. 11 illustrates an information transmission method according to one embodiment of the present disclosure.

[0038] FIG. 12 illustrates an information transmission method according to one embodiment of the present disclosure.

[0039] FIG. 13 illustrates a system for transmitting information to a non-terrestrial network communication node according to one embodiment of the present disclosure.

[0040] FIG. 14 illustrates an information transmission method according to one embodiment of the present disclosure.

[0041] Figure 15 illustrates an information transmission method according to one embodiment of the present disclosure.

[0042] Figure 16 illustrates an information transmission method according to one embodiment of the present disclosure.

[0043] FIG. 17 illustrates components of a network entity according to one embodiment of the present disclosure.

[0044] FIG. 18 illustrates components of a base station according to one embodiment of the present disclosure.

[0045] Embodiments of the present disclosure may address the problems and / or disadvantages described above and provide the advantages described below. One aspect of the present disclosure may provide a network entity (or node) and a communication method thereof in a wireless communication system.

[0046] The terms used in this disclosure are used only to describe specific embodiments and may not be intended to limit the scope of other embodiments. The singular expression may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by those of ordinary skill in the art described in this disclosure. Terms defined in general dictionaries among the terms used in this disclosure may be interpreted as having the same or similar meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this disclosure. In some cases, even if a term is defined in this disclosure, it cannot be interpreted to exclude embodiments of the present disclosure.

[0047] The various embodiments of the present disclosure described below illustrate hardware-based approaches. However, since the various embodiments of the present disclosure encompass techniques utilizing both hardware and software, the various embodiments of the present disclosure do not exclude software-based approaches.

[0048] Additionally, although various embodiments of the present disclosure describe various embodiments using terminology used in certain communication standards (e.g., 3rd generation partnership project (3GPP)), this is merely an example for illustrative purposes. Various embodiments of the present disclosure can be easily modified and applied to other communication systems.

[0049] Hereinafter, various embodiments of the present disclosure will be described.

[0050] According to embodiments of the present disclosure, in communication using a non-terrestrial network, a cell formed by a satellite can be classified into 1) an Earth fixed cell, 2) a Quasi-earth fixed cell, and 3) an Earth moving cell, depending on the operation method of the satellite.

[0051] An Earth-fixed cell is a cell with a fixed location. This fixed location can be established by a GEO satellite, whose orbital period is identical to the Earth's rotational period. A GEO satellite is a satellite that is always in the sky above a specific location on the Earth's surface. Therefore, a GEO satellite can establish a fixed location in a specific region of the Earth's surface.

[0052] Quasi-earth fixed cells and Earth moving cells are cells formed by satellites whose orbital period and Earth's rotation period are not the same, such as MEO or LEO.

[0053] FIG. 1a is a diagram illustrating a quasi-earth fixed cell according to one embodiment of the present disclosure.

[0054] Referring to Figure 1a, a quasi-earth fixed cell may be a cell fixed in a certain area of ​​the Earth's surface, formed by a satellite whose orbital period differs from the Earth's rotational period, such as a MEO or LEO satellite. However, to operate such a fixed cell, the satellite forming the cell may be changed.

[0055] When a satellite's orbital period differs from the Earth's rotational period, such as MEO or LEO satellites, the satellite's position will appear to move relative to a specific location on the Earth's surface. Therefore, to form a fixed-position cell in a specific area of ​​the Earth's surface, the satellite can rotate its antenna as it moves. In other words, the satellite can rotate its beam antenna to form a cell at a fixed location. However, if the satellite continues to move and cannot form a cell at the same location even when the antenna is rotated to the maximum rotation angle, another satellite in the vicinity may form a cell at the same location. In this way, in the case of quasi-earth fixed cells, the satellite forming the cell can change to operate the cell at the same location on the Earth's surface.

[0056] Referring to Fig. 1a, the area covered by a satellite (NTN vehicle) at time t1 and the area covered by the satellite at time t2 are shown, and the satellite is moving to the right. In such an environment, for a cell formed within the satellite's coverage area, the satellite can continuously form a cell in the area by adjusting the direction of the antenna while the area where the cell is located is located within the satellite's coverage area. In addition, if the satellite continues to move so that the area moves out of the satellite's coverage area (i.e., if the satellite cannot form a cell in the area even if it rotates its antenna to the maximum rotation angle), a cell may be formed in the same location by another satellite within the satellite's coverage area. Therefore, the location of a cell can remain fixed even when the satellite changes, and a quasi-earth fixed cell can refer to a cell whose location is fixed in this way.

[0057] FIG. 1b is a drawing for explaining an Earth moving cell according to one embodiment of the present disclosure.

[0058] An Earth moving cell is a cell whose position moves as the satellite moves, in an environment where the Earth's rotation speed and the satellite's orbital speed are different, such as a MEO or LEO satellite, when the satellite cannot rotate its antenna.

[0059] Referring to Fig. 1b, the position of the satellite (NTN vehicle) at time t1 and the position of the satellite at time t2 are depicted. That is, the satellite moved to the right in the diagram between time t2 and t1. Furthermore, the position of the cell formed by the satellite at time t1 has moved by the distance the satellite has moved, thereby changing the position at which the cell was formed. As shown in Fig. 1b, the Earth moving cell represents a cell whose position changes as the satellite moves.

[0060] Although FIGS. 1A and 1B describe cells formed by satellites, the cells described in the present disclosure may be formed by various communication node equipment that can be used for non-terrestrial network communications, such as HAPS, UAM, and drones, in addition to satellites.

[0061] Meanwhile, satellites used for non-terrestrial network communications can be classified into 1) transparent payload and 2) regenerative payload depending on their function.

[0062] A transparent payload is one in which the satellite is equipped with signal amplification and / or frequency conversion capabilities, allowing the satellite to transmit signals to the ground without processing them like a reflector or repeater. In this case, the satellite does not include functions that would allow it to function as a base station, such as a distributed unit (DU) or central unit (CU).

[0063] Regenerative payloads may be referred to as On-Board Processing (OBP) payloads, which are processors onboard the satellite that can process data, allowing the satellite to act as a base station, such as a DU or CU.

[0064] Embodiments according to the present disclosure can be applied not only to transparent payload satellites but also to regenerative payload satellites. A regenerative payload satellite may carry a DU, and a CU may reside on the ground. Furthermore, in one embodiment, a regenerative payload satellite may also carry a DU and a CU.

[0065] Figures 2a and 2b illustrate a system that links a terrestrial network and a non-terrestrial network according to one embodiment of the present disclosure. Wireless communication using a non-terrestrial network can be configured by combining a non-terrestrial network (e.g., a satellite communication network) with a terrestrial network. This is because both the terrestrial network and the non-terrestrial network are utilized during communication between a terminal and a server.

[0066] Non-terrestrial networks (e.g., satellite communication networks) and terrestrial networks can be divided into two types depending on their operation method: 1) a form in which terrestrial networks (e.g., mobile communication networks) and non-terrestrial networks are integrated, and 2) a form in which non-terrestrial networks and terrestrial networks are operated separately by different entities but can cooperate with each other.

[0067] The integrated form of terrestrial and non-terrestrial networks is an operational form in which both terrestrial base stations and non-terrestrial network communication nodes (e.g. satellites, HAPS, etc.) can be accessed and managed from the 3GPP Core Network (CN).

[0068] In cases where non-terrestrial and terrestrial networks are operated separately by different entities but cooperate with each other, the non-terrestrial network is accessed and managed by the non-terrestrial network management system (e.g., satellite network management system) that installs and manages the non-terrestrial network, while the terrestrial network is accessed and managed by the 3GPP CN. Furthermore, the non-terrestrial network management system (e.g., satellite network management system) and the terrestrial network CN (e.g., mobile network) can be linked to exchange necessary information between the two systems, yet operate independently.

[0069] Figures 2a and 2b illustrate a system in which a non-terrestrial network and a terrestrial network are operated (or managed) separately by different entities, yet can cooperate with each other. Figure 2a illustrates a system for linking a non-terrestrial network and a terrestrial network using a transparent payload satellite, and Figure 2b illustrates a system for linking a non-terrestrial network and a terrestrial network using a regenerative payload satellite.

[0070] Referring to Figure 2a, the terrestrial network is comprised of base stations (DUs and CUs) and a Core Network (CN), while the non-terrestrial network comprises a Satellite Transport Network. The terrestrial network may be operated or managed by a Cellular Network Management System, while the non-terrestrial network may be operated or managed by an External NTN Management System. When exchanging information between the terrestrial and non-terrestrial networks, the Cellular Network Management System and the External NTN Management System may cooperate to exchange information. Therefore, the exchanged information may be transmitted to and utilized by the Network Function (NF) of the base station or CN.

[0071] Referring to Fig. 2b, the terrestrial network is composed of a base station (CU) and a core network (CN), and the non-terrestrial network is composed of a satellite transport network. In this case, if the communication node of the non-terrestrial network is a regenerative payload satellite, the regenerative payload satellite may be equipped with a distributed unit (DU). The terrestrial network is operated or managed by a Cellular Network Management System, and the non-terrestrial network may be operated or managed by an External NTN Management System. In addition, since the regenerative payload satellite includes a DU, a portion of the non-terrestrial network may be operated or managed by the Cellular Network Management System.

[0072] When exchanging information between terrestrial and non-terrestrial networks, the Cellular Network Management System and the External NTN Management System can cooperate to exchange information. Therefore, the exchanged information can be transmitted to and utilized by the network function (NF) of the base station or CN.

[0073] FIG. 3 illustrates a system in which a terrestrial network and a non-terrestrial network are interconnected according to one embodiment of the present disclosure.

[0074] FIG. 3 may illustrate a process by which information regarding a non-terrestrial network communication node is transmitted in a system such as FIGS. 2a and 2b. The non-terrestrial network management server of FIG. 3 may correspond to the External NTN Management System of FIGS. 2a and 2b. Furthermore, the management service provider of FIG. 3 may correspond to the Cellular Network Management System of FIGS. 2a and 2b.

[0075] Referring to Figure 3, when a non-terrestrial network communication node is changed due to a cell operation method of the non-terrestrial network, the non-terrestrial network management server can transmit relevant information to the management service provider, and the management service provider can transmit the information to the base station. Accordingly, the base station generates and broadcasts system information block information based on the updated information, so that the terminal can utilize the information.

[0076] However, in the case of conventional technology, the use of public networks for information transmission and reception between non-terrestrial network management servers and managed service providers increased the possibility of network congestion and transmission / reception delays. Furthermore, because information was transmitted and received between managed service providers and base stations (RAN) based on the management plane, reliability was lower than when information was transmitted based on the user plane or control plane.

[0077] Embodiments according to the present disclosure relate to methods and devices for improving such problems.

[0078] FIG. 4 illustrates a system in which a terrestrial network and a non-terrestrial network are interconnected according to one embodiment of the present disclosure.

[0079] Referring to FIG. 4, a system according to one embodiment may include a core network (CN) (110), a base station (120), an Operational Awareness Management (OAM) (1330), and a non-terrestrial network management server (140).

[0080] The management service provider (130) can store or manage information required for modifying SIB information in the OAM / CN. The non-terrestrial network management server (140) can trigger information modification of SIB through the control plane of the core network (CN) (110) and the base station (120) and transmit and receive information required for modifying the information. In addition, the non-terrestrial network management server (140) can trigger information modification of SIB through the management plane of the management service provider (OAM) (130) and the base station (120) and transmit and receive information required for modifying the information. The base station (120) can transmit and receive information required for modifying SIB information with other base stations.

[0081] The non-terrestrial network management function (NTN management function, NMF) (112) includes a function that can check whether the storage space (memory) within the NMF (112) or the storage network function (NF) (e.g., UDN) within the CN that can communicate with the NMF (112) or the CU that can communicate with the NMF (112) stores information necessary for modifying the SIB (such as orbit and mobility information of the NMF communication node). In addition, the NMF (112) may include a function that can check whether the information necessary for modifying the SIB is available without being updated.

[0082] Signaling between a non-terrestrial network management server (140) and a base station (120) may include the non-terrestrial network management server (140) notifying a non-terrestrial network change to a non-terrestrial network management function (NMF) and receiving an ACK, the non-terrestrial network management server (140) transmitting necessary information to an Operational Service Provider (OAM) (130) and receiving an ACK, the non-terrestrial network management server (140) transmitting necessary information for SIB modification to the relevant base station (120) and receiving an ACK, the non-terrestrial network management server (140) requesting another base station (120) storing necessary information for SIB modification to transmit the necessary information to the target base station and receiving an ACK, and signaling for exchanging relevant information between base stations.

[0083] Information about cells or non-terrestrial network communication nodes generated by the non-terrestrial network management server (140) can be transmitted to the base station via the core network (110) or an Operational Aid Management (OAM) provider. The base station includes a Central Unit (CU) and a Distributed Unit (DU), and the CU of the base station can generate System Information Block (SIB) information based on the transmitted information. The base station can transmit a broadcast message including SIB information, and a terminal can access a non-terrestrial network cell based on the SIB information received from the base station.

[0084] Here, the SIB information included in the broadcast message may include various information such as the identifier of a non-terrestrial network communication node (e.g., satellite), location information, velocity information, and / or orbit information, and information related to a cell formed by the satellite.

[0085] In one embodiment, the SIB information includes an Information Element (IE) that includes orbital information, position information, and velocity information of a non-terrestrial communication node (e.g., a satellite) connected to a base station, and may also include information related to the satellite's cell operation (e.g., cell center location and diameter, surrounding satellite cell information). [Table 1] and [Table 2] below show the information included in the IE of the SIB information and the non-terrestrial network configuration information (e.g., NTN-Config).

[0086] SIB19 field descriptionsntn-ConfigProvides parameters needed for the UE to access NR via NTN access such as Ephemeris data, common TA parameters, k_offset, validity duration for UL sync information and epoch.ntn-NeighCellConfigList, ntn-NeighCellConfigListExtProvides a list of NTN neighbor cells including their ntn-Config, carrier frequency and PhysCellId. This set includes all elements of ntn-NeighCellConfigList and all elements of ntn-NeighCellConfigListExt. If ntn-Config is absent for an entry in ntn-NeighCellConfigListExt, the ntn-Config provided in the entry at the same position in ntn-NeighCellConfigList applies.

[0087] Ntn-Config is non-terrestrial network configuration information and may include parameters for a terminal to access NR via a non-terrestrial network. Ephemeris data, common TA parameters, k_offset, validity duration for UL sync information, and epoch.

[0088] Ntn-NeighCellConfigList can provide a list of non-terrestrial network neighbor cells and can include non-terrestrial network configuration information (ntn-Config), carrier frequency information, cell identifier information, etc.

[0089] NTN-Config field descriptionsEphemerisInfoThis field provides satellite ephemeris either in format of position and velocity state vector or in format of orbital parameters. This field is excluded when determining changes in system information, i.e. changes to ephemerisInfo should neither result in system information change notifications nor in a modification of valueTag in SIB1.ta-CommonNetwork-controlled common timing advanced value and it may include any timing offset considered necessary by the network. ta-Common with value of 0 is supported. The granularity of ta-Common is 4.072 Х 10^(-3) μs. Values are given in unit of corresponding granularity. This field is excluded when determining changes in system information, i.e. changes of ta-Common should neither result in system information change notifications nor in a modification of valueTag in SIB1.ta-CommonDriftIndicate drift rate of the common TA. The granularity of ta-CommonDrift is 0.2 Х 10^(-3) μs / s.Values ​​are given in unit of corresponding granularity. This field is excluded when determining changes in system information, ie changes of ta-CommonDrift should neither result in system information change notifications nor in a modification of valueTag in SIB1.ta-CommonDriftVariantIndicate drift rate variation of the common TA. The granularity of ta-CommonDriftVariation is 0.2Х10^(-4) μs / s^2. Values ​​are given in unit of corresponding granularity. This field is excluded when determining changes in system information, ie changes of ta-CommonDriftVariant should neither result in system information change notifications nor in a modification of valueTag in SIB1.

[0090] EphemerisInfo can provide parameters representing the position, velocity, and orbital information of non-terrestrial communication nodes (e.g., satellites).

[0091] The core network (110) may include an Access & mobility management function (AMF), a Non-terrestrial network management function (NMF), and / or a Network exposure function (NEF).

[0092] The NMF (112) can receive information about non-terrestrial network communication nodes from the non-terrestrial network management server (140) and determine whether a non-terrestrial network communication node connected to a base station has changed. In addition, the NMF (112) can determine whether information related to the received information is stored in its own memory or in another network function (e.g., UDR, UDM) of the core network (110). In addition, the NMF (112) can determine whether information related to the received information is stored in the base station.

[0093] NEF (114) and AMF (116) can be understood as network functions (NF) described in the 3GPP standard, and can be understood as network functions used to transmit information from a non-terrestrial network management server (140) to a core network (110) and to transmit information from the core network (110) to a base station (120).

[0094] Although the description of various network functions that may be included in the core network (110) in this disclosure is omitted, the core network (110) may include other network functions in addition to the AMF (116) and the NEF (114), and information about non-terrestrial network communication nodes may be transmitted through other network functions.

[0095] In one embodiment, information about a non-terrestrial network communication node may be communicated between a base station (120), a core network (110), and a non-terrestrial network management server (140) via NEF (114) or AMF (116).

[0096] Additionally, in one embodiment, information about a non-terrestrial network communication node may be transmitted directly from the non-terrestrial network management server (140) to the NMF (112) without going through the NEF (114) or AMF (116), or may be transmitted directly from the NMF (112) to the base station (120).

[0097] FIG. 5 illustrates a system for transmitting information to a non-terrestrial network communication node according to one embodiment of the present disclosure.

[0098] Referring to FIG. 5, a system is shown that transmits information about a non-terrestrial network communication node when the non-terrestrial network communication node connected to the base station changes from non-terrestrial network communication node 1 to non-terrestrial network communication node 2 according to the quasi-earth fixed cell operation method.

[0099] Non-terrestrial communication node 1 can form cell A at the same location by rotating its antenna while moving. If non-terrestrial communication node 1 continues to move and cannot form cell (A) at the same location, non-terrestrial communication node 2, which can form cell (A) at that location, can form cell (A). Accordingly, the non-terrestrial communication node connected to the base station by the non-terrestrial communication management system can be changed from non-terrestrial communication node 1 to non-terrestrial communication node 2 (①).

[0100] The non-terrestrial network management server can transmit information about non-terrestrial network communication node 2 connected to the base station to the core network (②).

[0101] Information about non-terrestrial network communication node 2 can be transmitted from the NEF of the core network to the NMF, and from the NMF to the AMF (③). In addition, information about non-terrestrial network communication node 2 can be transmitted to the CU of the base station via the AMF (④).

[0102] The CU of the base station updates SIB information based on the received information, transmits a broadcast message including the updated SIB information to the terminal, and the terminal can access the cell (A) formed by the non-terrestrial network communication node 2 based on the SIB information included in the received message.

[0103] The non-terrestrial network management server can transmit information about changed non-terrestrial network communication nodes, including information necessary for changing SIB IEs, to the NMF of the core network (with or without orbital info). Then, the NMF can transmit the information to the CU of the base station through the Control Plane (CP) interface that can be transmitted to the CU of the base station. The CU can receive the information, update the IE in the SIB with the received information, and broadcast it.

[0104] The information transmission method according to one embodiment described in FIG. 5 can improve the reliability and speed of information transmission in that it transmits information to a base station through a control plane of a core network without transmitting information through a management plane.

[0105] The non-terrestrial network management server, network functions of the core network, and base station illustrated in FIG. 5 may correspond to the components of the system illustrated in FIG. 4.

[0106] FIG. 6 illustrates an information transmission method according to one embodiment of the present disclosure.

[0107] FIG. 6 can illustrate the operation of the components described in FIG. 4 in the non-terrestrial network communication node change situation described in FIG. 5.

[0108] Operation 602 is an operation in which the non-terrestrial network management server (140) recognizes that the non-terrestrial network communication node corresponding to the target cell has changed by the non-terrestrial network management system. Operation 602 may be an operation in which the non-terrestrial network communication node connected to the base station has changed.

[0109] Operation 604 is an operation for notifying the non-terrestrial network management server (140) of a change in a cell and / or non-terrestrial network communication node. In operation 604, the non-terrestrial network management server (140) may transmit to the NMF (112) at least one of a cell identifier (e.g., Physical Cell ID, PID), an identifier of the non-terrestrial network communication node, location information, speed information, and orbital information of the non-terrestrial network communication node, and the validity period of the information. These notifications and information may be transmitted from the non-terrestrial network management server (140) to the NMF (112) via the NEF (114), or may be transmitted directly from the non-terrestrial network management server (140) to the NMF (112). In addition, the notification message may include at least the minimum information that can identify the changed non-terrestrial network communication node in the NMF (112). Before requesting all necessary information about a changed non-terrestrial network communication node from the non-terrestrial network management server (140), the NMF (112) can determine whether there is an entity (such as a network function or base station) that stores the necessary information with minimal information. Accordingly, the size of data transmitted and received between the non-terrestrial network management server (140) and the NMF (112) can be reduced.

[0110] Action 606 is an action that notifies the non-terrestrial network management server (140) of the receipt of change notifications and / or related information received by action 604 in the NMF (112). Such notification may be transmitted to the non-terrestrial network management server (140) via the NEF (114) or may be transmitted directly from the NMF (112) to the non-terrestrial network management server (140).

[0111] Operation 608 represents an operation of determining whether information about a non-terrestrial communication node changed in the NMF (112) is stored or available. In operation 608, the NMF (112) may determine whether information about a non-terrestrial communication node is stored (or available) in its own memory, or whether information about a non-terrestrial communication node is stored (or available) in a network function of the core network (e.g., a network function including a database capable of storing information about a non-terrestrial communication node, UDM, UDR, etc.). In operation 608, whether information about a non-terrestrial communication node is available may be determined based on the validity period of the information.

[0112] Action 610 represents an action in which the NMF (112) requests information on the changed non-terrestrial network communication node from the non-terrestrial network management server (140) when it is determined that information on the changed non-terrestrial network communication node is not stored (or is determined to be unavailable) in action 608. At this time, the request may include an identifier for the changed non-terrestrial network communication node and / or metadata related to the requested information.

[0113] Action 612 represents an action of transmitting information about a changed non-terrestrial communication node from the non-terrestrial network management server (140) to the NMF (112) in response to a request of action 610. In action 610, the information may be transmitted through the NEF (114) or directly transmitted from the non-terrestrial network management server (140) to the NMF (112). The information about the changed non-terrestrial communication node may include all information required for the base station (122) to change the IE of the SIB (e.g., the identifier of the non-terrestrial communication node, location information, speed information, orbit information, etc.).

[0114] Operation 614 represents an operation in which the NMF (112) updates (or stores) information about a non-terrestrial communication node received by operation 612. The NMF (112) may update (or store) information about a non-terrestrial communication node in its own memory, or update (or store) information about a non-terrestrial communication node in a network function of the core network (e.g., a network function including a database capable of storing information about a non-terrestrial communication node, UDM, UDR, etc.).

[0115] Operation 616 represents an operation in which the NMF (112) requests an update of information regarding a changed non-terrestrial communication node from the base station's CU (122). The request includes information regarding the changed non-terrestrial communication node. Furthermore, in operation 616, the request message may be transmitted to the CU (122) via the AMF (116) or directly from the NMF (112) to the CU (122).

[0116] Action 618 represents an action of transmitting a notification of completion of an information update on a non-terrestrial network communication node changed in CU (122) to NMF (112). The notification may be transmitted to NMF (112) via AMF (116) or directly from CU (122) to NMF (112).

[0117] Operation 620 represents an operation in which the CU (122) of the base station generates a system information block based on updated information about the non-terrestrial network communication node. The CU (122) may periodically generate the system information block.

[0118] Although not shown in FIG. 6, after operation 620, the base station can transmit information about the updated non-terrestrial network communication node to the terminal, and the terminal can access the cell of the changed non-terrestrial network communication node based on the received information and perform communication with the base station.

[0119] Figure 7 illustrates an information transmission method according to one embodiment of the present disclosure.

[0120] The information transmission method illustrated in Fig. 7 represents a case where information about a changed non-terrestrial network communication node is stored in the network function of the core network.

[0121] Fig. 7 can show the operation of the components described in Fig. 4 in the non-terrestrial network communication node change situation described in Fig. 5.

[0122] Operation 702 is an operation in which the non-terrestrial network management server (140) recognizes that the non-terrestrial network communication node corresponding to the target cell has changed by the non-terrestrial network management system. Operation 602 may be an operation in which the non-terrestrial network communication node connected to the base station has changed.

[0123] Operation 704 is an operation for notifying the non-terrestrial network management server (140) of a change in a cell and / or non-terrestrial network communication node. In operation 704, the non-terrestrial network management server (140) may transmit at least one of a cell identifier, an identifier of the non-terrestrial network communication node, location information, speed information, and orbital information of the non-terrestrial network communication node to the NMF (112). These notifications and information may be transmitted from the non-terrestrial network management server (140) to the NMF (112) via the NEF (114), or may be directly transmitted from the non-terrestrial network management server (140) to the NMF (112). In addition, the notification message may include a minimum amount of information that can identify the changed non-terrestrial network communication node in the NMF (112). Before requesting all necessary information about a changed non-terrestrial network communication node from the non-terrestrial network management server (140), the NMF (112) can determine whether there is an entity (such as a network function or base station) that stores the necessary information with minimal information. Accordingly, the size of data transmitted and received between the non-terrestrial network management server (140) and the NMF (112) can be reduced.

[0124] Action 706 is an action that notifies the non-terrestrial network management server (140) of the receipt of change notifications and / or related information received by action 704 in the NMF (112). Such notification may be transmitted to the non-terrestrial network management server (140) via the NEF (114) or may be transmitted directly from the NMF (112) to the non-terrestrial network management server (140).

[0125] Operation 708 represents an operation of determining whether information about a non-terrestrial communication node changed in the NMF (112) is stored or available. In operation 708, the NMF (112) may determine whether information about a non-terrestrial communication node is stored (or available) in its own memory, or whether information about a non-terrestrial communication node is stored (or available) in a network function of the core network (e.g., a network function including a database capable of storing information about a non-terrestrial communication node, UDM, UDR, etc.). In addition, the NMF (112) may determine whether information about a non-terrestrial communication node is stored (or available) in another base station. In operation 708, whether information about a non-terrestrial communication node can be used may be determined based on the validity period of the information.

[0126] Operation 710 represents an operation in which the NMF (112) requests the CU (122) to update information about the changed non-terrestrial communication node, if it is determined that information about the changed non-terrestrial communication node is stored (or is determined to be available) in operation 708. At this time, the request may include information about the changed non-terrestrial communication node. In operation 710, the request message may be transmitted to the CU (122) via the AMF (116) or may be directly transmitted from the NMF (112) to the CU (122). The information about the changed non-terrestrial communication node included in the request may include all information (e.g., identifier of the non-terrestrial communication node, location information, speed information, orbit information, etc.) required for the base station (122) to change the IE of the SIB.

[0127] Action 712 represents an action of transmitting a notification of completion of an information update on a non-terrestrial network communication node changed in CU (122) to NMF (112). The notification may be transmitted to NMF (112) via AMF (116) or directly from CU (122) to NMF (112).

[0128] Operation 714 represents an operation in which the CU (122) of the base station generates a system information block based on updated information about the non-terrestrial network communication node. The CU (122) may periodically generate the system information block.

[0129] Although not shown in FIG. 7, after operation 714, the base station can transmit information about the updated non-terrestrial network communication node to the terminal, and the terminal can access the cell of the changed non-terrestrial network communication node based on the received information and perform communication with the base station.

[0130] FIG. 8 illustrates a system for transmitting information to a non-terrestrial network communication node according to one embodiment of the present disclosure.

[0131] Referring to FIG. 8, a system is shown that transmits information about a non-terrestrial network communication node when the non-terrestrial network communication node connected to the base station changes from non-terrestrial network communication node 1 to non-terrestrial network communication node 2 according to the quasi-earth fixed cell operation method.

[0132] Non-terrestrial network communication node 1 can form cell A at the same location by rotating its antenna while moving. If non-terrestrial network communication node 1 cannot form cell (A) at the same location even if it continues to move and rotates its antenna to the maximum angle, non-terrestrial network communication node 2, which can form cell (A) at that location, can form cell (A). Therefore, the non-terrestrial network communication node connected to base station 1 by the non-terrestrial network management system can be changed from non-terrestrial network communication node 1 to non-terrestrial network communication node 2 (①).

[0133] In FIG. 8, the NMF can determine whether information about a non-terrestrial communication node 2 is stored in base station 2 or is available, and if it is determined that information about a non-terrestrial communication node 2 is stored in base station 2 or is available, it can request base station 2 to transmit information about a non-terrestrial communication node 2 to base station 1 (②). And, according to the request, information about a non-terrestrial communication node 2 can be transmitted from base station 2 to base station 1 (③).

[0134] CU 1 of base station 1 can update SIB information based on the received information, base station 1 transmits a broadcast message including the updated SIB information to the terminal, and the terminal can access the cell (A) formed by the non-terrestrial network communication node 2 based on the SIB information included in the received message.

[0135] The information transmission method according to one embodiment described in FIG. 8 is efficient in that it is more effective to transmit information between base stations than to transmit information from a core network to a base station when the distance between the base stations is relatively close.

[0136] The non-terrestrial network management server, network functions of the core network, and base station illustrated in FIG. 8 may correspond to the components of the system illustrated in FIG. 4.

[0137] Figure 9 illustrates an information transmission method according to one embodiment of the present disclosure.

[0138] FIG. 9 can illustrate the operation of the components described in FIG. 4 in the non-terrestrial network communication node change situation described in FIG. 8.

[0139] Operation 902 is an operation in which the non-terrestrial network management server (140) recognizes that the non-terrestrial network communication node corresponding to the target cell has changed by the non-terrestrial network management system. Operation 902 may be an operation in which the non-terrestrial network communication node connected to the base station has changed.

[0140] Operation 904 is an operation for notifying the non-terrestrial network management server (140) of a change in a cell and / or non-terrestrial network communication node. In operation 904, the non-terrestrial network management server (140) may transmit at least one of a cell identifier, an identifier of the non-terrestrial network communication node, location information, speed information, and orbital information of the non-terrestrial network communication node to the NMF (112). These notifications and information may be transmitted from the non-terrestrial network management server (140) to the NMF (112) via the NEF (114), or may be directly transmitted from the non-terrestrial network management server (140) to the NMF (112). In addition, the notification message may include a minimum amount of information that can identify the changed non-terrestrial network communication node in the NMF (112). Before requesting all necessary information about a changed non-terrestrial network communication node from the non-terrestrial network management server (140), the NMF (112) can determine whether there is an entity (such as a network function or base station) that stores the necessary information with minimal information. Accordingly, the size of data transmitted and received between the non-terrestrial network management server (140) and the NMF (112) can be reduced.

[0141] Action 906 is an action that notifies the non-terrestrial network management server (140) of the receipt of change notifications and / or related information received by action 904 in the NMF (112). Such notification may be transmitted to the non-terrestrial network management server (140) via the NEF (114) or may be transmitted directly from the NMF (112) to the non-terrestrial network management server (140).

[0142] Operation 908 represents an operation of determining whether information about a changed non-terrestrial communication node is stored in a base station or available in the NMF (112). In operation 908, the NMF (112) can determine whether there is a base station among a plurality of base stations that stores information about a changed non-terrestrial communication node. In other words, the NMF (112) can determine whether a specific base station stores information about a changed non-terrestrial communication node. The NMF (112) can generate management information indicating information about non-terrestrial communication nodes stored by base stations, and operation 908 can be performed based on the management information. Through operation 908, the NMF (112) can determine which base station stores information about a changed non-terrestrial communication node. In operation 908, it can be determined whether the information about the non-terrestrial communication node can be used based on the validity period of the information.

[0143] Action 910 represents an action in which, if it is determined that information about a non-terrestrial communication node changed in action 908 is stored in CU 1 (122) (or is determined to be available), NMF (112) requests CU 1 (122) to transmit information about a changed non-terrestrial communication node to CU 2 (222). At this time, the request may include an identifier for the changed non-terrestrial communication node, information about a source CU (e.g., CU 1) and / or a target CU (e.g., CU 2). In addition, the request may include information about information to be transmitted from CU 1 (122) to CU 2 (222).

[0144] Action 912 represents an action in which CU 1 (122) transmits information about a changed non-terrestrial communication node to CU 2 (222) at the request of Action 910. The information about the changed non-terrestrial communication node may include all information (e.g., identifier of the non-terrestrial communication node, location information, speed information, orbit information, etc.) required for the base station (122) to change the IE of the SIB.

[0145] Action 914 represents an action by which CU 2 (222) notifies CU 1 (122) of the receipt of information about a changed non-terrestrial network communication node. CU 2 (222) may transmit an ACK when it has received all the information for changing the IE of the SIB.

[0146] Action 916 represents an action that notifies completion of information update for a non-terrestrial network communication node that CU 1 (122) has changed to NMF (112).

[0147] In one embodiment, operations 914 and 916 may be integrated so that CU 2 (222) may transmit a notification to NMF (112) of the completion of receiving and updating information about the non-terrestrial network communication node.

[0148] Operation 918 represents an operation in which the CU 2 (222) of the base station generates a system information block based on updated information about the non-terrestrial network communication node. CU 2 (222) may periodically generate the system information block.

[0149] Although not shown in FIG. 9, after operation 918, the base station can transmit information about the updated non-terrestrial network communication node to the terminal, and the terminal can access the cell of the changed non-terrestrial network communication node based on the received information and perform communication with the base station.

[0150] FIG. 10 illustrates a system for transmitting information to a non-terrestrial network communication node according to one embodiment of the present disclosure.

[0151] Referring to FIG. 10, a system for transmitting information about a non-terrestrial network communication node is shown when the non-terrestrial network communication node connected to the base station changes from non-terrestrial network communication node 1 to non-terrestrial network communication node 2 according to the Earth moving cell operation method.

[0152] According to the Earth moving cell operation method, as the non-terrestrial network communication node 1 moves, the cell formed by the non-terrestrial network communication node 1 also moves. At this time, if the non-terrestrial network communication node 1 continues to move and the location of the cell goes beyond the range of a specific area or region (e.g., an area outside a national border or a sea area far from land, etc.), the cell corresponding to the base station may be changed because the cell in question no longer needs to be operated (①). In this case, as the cell corresponding to the base station changes, the non-terrestrial network communication node connected to the base station may be changed from non-terrestrial network communication node 1 to non-terrestrial network communication node 2.

[0153] The non-terrestrial network management server can generate information about non-terrestrial network communication node 2 connected to the base station (②) and transmit it to the core network (②).

[0154] Information about non-terrestrial network communication node 2 can be transmitted from the NEF of the core network to the NMF, and from the NMF to the AMF (④). In addition, information about non-terrestrial network communication node 2 can be transmitted to the CU of the base station via the AMF (⑤).

[0155] The CU of the base station can update SIB (System information block) information based on the received information, transmit a broadcast message including the updated SIB information to the terminal, and the terminal can access a cell formed by the non-terrestrial network communication node 2 based on the SIB information included in the received message.

[0156] The information transmission method according to one embodiment described in FIG. 10 can improve the reliability and speed of information transmission by transmitting information to a base station through a control plane of a core network rather than transmitting information through a management plane.

[0157] The non-terrestrial network management server, network functions of the core network, and base station illustrated in FIG. 10 may correspond to the components of the system illustrated in FIG. 4.

[0158] FIG. 11 illustrates an information transmission method according to one embodiment of the present disclosure.

[0159] Fig. 11 can illustrate the operation of the components described in Fig. 4 in the non-terrestrial network communication node change situation described in Fig. 10.

[0160] Action 1102 may represent an action in which a base station is assigned to a non-terrestrial network cell that has entered a management area or territory. Action 1102 may be performed in cooperation with the non-terrestrial network management system and / or network functions within the core network.

[0161] Operation 1104 is an operation in which the NMF (112) determines whether the non-terrestrial communication node corresponding to (or connected to) the base station has changed. Even if the cell assigned to the base station has changed, there may be cases in which the non-terrestrial communication node connected to the base station does not change. For example, if the changed cell is located within the coverage area of ​​the same satellite and within the management area, the base station may be connected to the same satellite. Therefore, operation 1104 allows the NMF (112) to determine whether the non-terrestrial communication node corresponding to (or connected to) the base station has changed.

[0162] Operation 1106 represents an operation of determining whether information about a non-terrestrial communication node changed in the NMF (112) is stored or available. In operation 1106, the NMF (112) may determine whether information about a non-terrestrial communication node is stored (or available) in its own memory, or whether information about a non-terrestrial communication node is stored (or available) in a network function of the core network (e.g., a network function including a database capable of storing information about a non-terrestrial communication node, UDM, UDR, etc.). In operation 1106, whether information about a non-terrestrial communication node is available may be determined based on the validity period of the information.

[0163] Operation 1108 represents an operation in which the NMF (112) requests information on the changed non-terrestrial network communication node from the non-terrestrial network management server (140) if it is determined that information on the changed non-terrestrial network communication node is not stored (or is determined to be unavailable) in operation 1106. At this time, the request may include an identifier for the changed non-terrestrial network communication node and / or metadata related to the requested information. In addition, the information included in the request may be transmitted to the NMF (112) in operation 1102.

[0164] Action 1110 represents an action of transmitting information about a changed non-terrestrial network communication node from the non-terrestrial network management server (140) to the NMF (112) in response to a request from Action 1108. In Action 1110, the information may be transmitted via the NEF (114) or directly from the non-terrestrial network management server (140) to the NMF (112).

[0165] The 1112 operation represents an operation in which the NMF (112) updates (or stores) information about the non-terrestrial communication node received by the 1110 operation. The NMF (112) may update (or store) information about the non-terrestrial communication node in its own memory, or update (or store) information about the non-terrestrial communication node in a network function of the core network (e.g., a network function including a database capable of storing information about the non-terrestrial communication node, UDM, UDR, etc.).

[0166] Operation 1114 represents an operation in which the NMF (112) requests an update of information regarding a changed non-terrestrial communication node from the base station's CU (122). The request includes information regarding the changed non-terrestrial communication node. Furthermore, in operation 1112, the request message may be transmitted to the CU (122) via the AMF (116) or directly from the NMF (112) to the CU (122).

[0167] Action 1116 represents an action of transmitting a notification of completion of an information update for a non-terrestrial network communication node changed in CU (122) to NMF (112). The notification may be transmitted to NMF (112) via AMF (116) or directly from CU (122) to NMF (112).

[0168] Operation 1118 represents an operation in which the CU (122) of the base station generates a system information block based on updated information about the non-terrestrial network communication node. The CU (122) may periodically generate the system information block.

[0169] Although not shown in FIG. 11, after operation 1118, the base station can transmit information about the updated non-terrestrial network communication node to the terminal, and the terminal can access the cell of the changed non-terrestrial network communication node based on the received information and perform communication with the base station.

[0170] Figure 12 illustrates an information transmission method according to one embodiment of the present disclosure.

[0171] Fig. 12 can show the operation of the components described in Fig. 4 in the non-terrestrial network communication node change situation described in Fig. 10.

[0172] Action 1202 may represent an action in which a base station is assigned to a non-terrestrial network cell that has entered a management area or territory. Action 1202 may be performed in cooperation with the non-terrestrial network management system and / or network functions within the core network.

[0173] Operation 1206 represents an operation of determining whether information about a changed non-terrestrial communication node is stored or available in the NMF (112). In operation 1206, the NMF (112) may determine whether information about a non-terrestrial communication node is stored (or available) in its own memory, or whether information about a non-terrestrial communication node is stored (or available) in a network function of the core network (e.g., a network function including a database capable of storing information about a non-terrestrial communication node, UDM, UDR, etc.). In addition, operation 1206 may include an operation of determining whether information about a changed non-terrestrial communication node is stored (or available) in a base station. In operation 1206, whether information about a non-terrestrial communication node can be used may be determined based on a validity period of the information.

[0174] Operation 1208 represents an operation in which the NMF (112) requests the CU (122) of the base station to update information about the changed non-terrestrial communication node (or use stored information) if it is determined that information about the changed non-terrestrial communication node is stored (or determined to be available) in operation 1206. The request includes information about the changed non-terrestrial communication node. In addition, in operation 1208, the request message may be transmitted to the CU (122) via the AMF (116) or may be directly transmitted from the NMF (112) to the CU (122). The information about the changed non-terrestrial communication node included in the request message may include all information (e.g., identifier of the non-terrestrial communication node, location information, speed information, orbit information, etc.) necessary for the base station (122) to change the IE of the SIB.

[0175] Action 1208 represents an action of transmitting a notification of completion of information update (or use) for a non-terrestrial network communication node changed in CU (122) to NMF (112). The notification may be transmitted to NMF (112) via AMF (116) or directly from CU (122) to NMF (112).

[0176] Operation 1210 represents an operation in which a CU (122) of a base station generates a system information block based on information about a changed non-terrestrial network communication node. The CU (122) may periodically generate a system information block.

[0177] Although not shown in FIG. 12, after operation 1210, the base station can transmit information about the changed non-terrestrial network communication node to the terminal, and the terminal can access the cell of the changed non-terrestrial network communication node based on the received information and perform communication with the base station.

[0178] FIG. 13 illustrates a system for transmitting information to a non-terrestrial network communication node according to one embodiment of the present disclosure.

[0179] Referring to Fig. 13, a system for transmitting information about a non-terrestrial network communication node when a non-terrestrial network communication node connected to base station 1 changes from non-terrestrial network communication node 1 to non-terrestrial network communication node 2 according to an Earth moving cell operation method is shown.

[0180] According to the Earth moving cell operation method, as the non-terrestrial network communication node 1 moves, the cell (A) formed by the non-terrestrial network communication node 1 also moves. At this time, if the non-terrestrial network communication node 1 continues to move so that the location of the cell (A) goes beyond the range of a specific area or region (e.g., an area outside a national border or a sea area far from land, etc.), the cell corresponding to the base station may be changed since the cell (A) no longer needs to be operated (①). In this case, as the cell corresponding to the base station changes, the non-terrestrial network communication node connected to the base station may be changed from non-terrestrial network communication node 1 to non-terrestrial network communication node 2.

[0181] In FIG. 13, the NMF can determine whether information about a non-terrestrial communication node 2 is stored in base station 2 or is available, and if it is determined that information about a non-terrestrial communication node 2 is stored in base station 2 or is available, it can request base station 2 to transmit information about a non-terrestrial communication node 2 to base station 1 (②). And, according to the request, information about a non-terrestrial communication node 2 can be transmitted from base station 2 to base station 1 (③).

[0182] CU 1 of base station 1 can update SIB information based on the received information, base station 1 transmits a broadcast message including the updated SIB information to the terminal, and the terminal can access the cell (A') formed by the non-terrestrial network communication node 2 based on the SIB information included in the received message.

[0183] The information transmission method according to one embodiment described in FIG. 13 is efficient in that it is more effective to transmit information between base stations than to transmit information from a core network to a base station when the distance between the base stations is relatively close.

[0184] The non-terrestrial network management server, network functions of the core network, and base station illustrated in FIG. 13 may correspond to the components of the system illustrated in FIG. 4.

[0185] FIG. 14 illustrates an information transmission method according to one embodiment of the present disclosure.

[0186] Fig. 14 can illustrate the operation of the components described in Fig. 4 in the non-terrestrial network communication node change situation described in Fig. 13.

[0187] Action 1402 may represent an action in which a base station is assigned to a non-terrestrial network cell that has entered a management area or territory. Action 1402 may be performed in cooperation with the non-terrestrial network management system and / or network functions within the core network.

[0188] Operation 1404 is an operation in which the NMF (112) determines whether the non-terrestrial communication node corresponding to (or connected to) the base station has changed. Even if the cell assigned to the base station has changed, there may be cases in which the non-terrestrial communication node connected to the base station does not change. For example, if the changed cell is located within the coverage area of ​​the same satellite and within the management area, the base station may be connected to the same satellite. Therefore, operation 1104 allows the NMF (112) to determine whether the non-terrestrial communication node corresponding to (or connected to) the base station has changed.

[0189] Operation 1406 represents an operation of determining whether information about a changed non-terrestrial communication node is stored or available in a base station in the NMF (112). In operation 1406, the NMF (112) can determine whether there is a base station among a plurality of base stations that stores information about a changed non-terrestrial communication node. In other words, the NMF (112) can determine whether a specific base station stores information about a changed non-terrestrial communication node. The NMF (112) can generate management information indicating information about non-terrestrial communication nodes stored by base stations, and operation 1406 can be performed based on the management information. By operation 1406, the NMF (112) can determine which base station stores information about a changed non-terrestrial communication node. In operation 1406, it can be determined whether the information about the non-terrestrial communication node can be used based on the validity period of the information.

[0190] Action 1408 represents an action in which, if it is determined that information about the changed non-terrestrial communication node in Action 1406 is stored in CU 1 (122) (or is determined to be available), NMF (112) requests CU 1 (122) to transmit information about the changed non-terrestrial communication node to CU 2 (222). At this time, the request may include an identifier for the changed non-terrestrial communication node, information about the source CU (e.g., CU 1) and / or the target CU (e.g., CU 2).

[0191] Action 1410 represents an action in which CU 1 (122) transmits information about a changed non-terrestrial communication node to CU 2 (222) at the request of action 1408. The information about the changed non-terrestrial communication node may include all information (e.g., identifier of the non-terrestrial communication node, location information, speed information, orbit information, etc.) required for the base station (122) to change the IE of the SIB.

[0192] Action 1412 represents an action by which CU 2 (222) notifies CU 1 (122) of the receipt of information about a changed non-terrestrial network communication node. Following action 1412, CU 1 (122) may perform an action by notifying NMF (112) of the completion of an information update about a changed non-terrestrial network communication node.

[0193] In one embodiment, CU 2 (222) may transmit a notification to NMF (112) of the completion of receiving and updating information for a non-terrestrial network communication node.

[0194] Operation 1414 represents an operation in which CU 2 (222) of base station 2 generates a system information block based on updated information about non-terrestrial network communication nodes. CU 2 (222) may periodically generate the system information block.

[0195] Although not shown in FIG. 14, after operation 1414, the base station can transmit information about the updated non-terrestrial network communication node to the terminal, and the terminal can access the cell of the changed non-terrestrial network communication node based on the received information and perform communication with the base station.

[0196] Figure 15 illustrates an information transmission method according to one embodiment of the present disclosure.

[0197] Figure 15 illustrates a method for transmitting information about a changed non-terrestrial network communication node through a non-terrestrial network management service provider (130) in a situation where the non-terrestrial network communication node connected to the base station is changed. In other words, an embodiment in which signaling is performed through the management plane may be illustrated.

[0198] Operation 1502 is an operation in which the non-terrestrial network management server (140) recognizes that the non-terrestrial network communication node corresponding to the target cell has changed by the non-terrestrial network management system. Operation 1502 may be an operation in which the non-terrestrial network communication node connected to the base station has changed.

[0199] Operation 1504 is an operation in which the non-terrestrial network management server (140) notifies the non-terrestrial network management service provider (130) of a change in a cell and / or non-terrestrial network communication node. In operation 1504, the non-terrestrial network management server (140) may transmit at least one of a cell identifier, an identifier of the non-terrestrial network communication node, location information, speed information, and orbit information of the non-terrestrial network communication node to the non-terrestrial network management service provider (130).

[0200] Action 1506 is an action of notifying the non-terrestrial network management server (140) of the receipt of change notifications and / or related information received by action 1504 from the non-terrestrial network management service provider (130).

[0201] Operation 1508 represents an operation of determining whether information about a changed non-terrestrial communication node is stored or available in the non-terrestrial network management service provider (130). In operation 1508, the non-terrestrial network management service provider (130) may determine whether information about a non-terrestrial communication node is stored (or available) in its own memory, or whether information about a non-terrestrial communication node is stored (or available) in a network function of the core network (e.g., a network function including a database capable of storing information about a non-terrestrial communication node, UDM, UDR, etc.). In addition, the non-terrestrial network management service provider (130) may determine whether information about a non-terrestrial communication node is stored (or available) in another base station. In operation 1508, whether information about a non-terrestrial communication node can be used may be determined based on the validity period of the information.

[0202] Operation 1510 indicates an operation in which the non-terrestrial network management service provider (130) requests the CU (122) to update information about the changed non-terrestrial network communication node, if it is determined that information about the changed non-terrestrial network communication node is stored (or is determined to be available) in operation 1508. At this time, the request may include information about the changed non-terrestrial network communication node. The information about the changed non-terrestrial network communication node may include all information (e.g., identifier of the non-terrestrial network communication node, location information, speed information, orbit information, etc.) required for the base station (122) to change the IE of the SIB.

[0203] Action 1512 represents an action of transmitting a notification of completion of an information update on a non-terrestrial network communication node changed in CU (122) to a non-terrestrial network management service provider (130).

[0204] Operation 1514 represents an operation in which the CU (122) of the base station generates a system information block based on updated information about the non-terrestrial network communication node. The CU (122) may periodically generate the system information block.

[0205] Although not shown in FIG. 15, after operation 1514, the base station can transmit information about the updated non-terrestrial network communication node to the terminal, and the terminal can access the cell of the changed non-terrestrial network communication node based on the received information and perform communication with the base station.

[0206] As shown in FIG. 15, a system according to one embodiment of the present disclosure may transmit information about a non-terrestrial network communication node to a base station through a management plane.

[0207] The operations according to the embodiments described in FIGS. 6 to 15 can be combined by a person skilled in the art, and embodiments that can be derived by combining the embodiments described in FIGS. 6 to 16 can be understood as being described by the present disclosure.

[0208] FIG. 16 illustrates an information transmission method of a non-terrestrial network management function (NMF) according to one embodiment of the present disclosure.

[0209] Referring to FIG. 16, a flowchart of operations performed by NMF is described when a non-terrestrial network communication node corresponding to a base station is changed in wireless communication using a non-terrestrial network.

[0210] Action 1602 represents an action to identify that a non-terrestrial communication node connected to a first base station in the NMF has changed from a first communication node to a second communication node. Action 1602 may include an action to identify whether a non-terrestrial communication node has changed, either by receiving a notification from a non-terrestrial management server or another network entity, or at the NMF's own discretion.

[0211] Operation 1604 represents an operation in which the NMF determines whether information about the second communication node is stored in the second base station. Operation 1604 may be an operation for identifying the base station storing the information about the second communication node. The NMF may generate management information indicating information about non-terrestrial network communication nodes stored (or used) by multiple base stations. Based on this management information, the NMF may identify which base station stores the information about the second communication node. In other words, the NMF may determine that the information about the second communication node is stored in the second base station.

[0212] Operation 1606 represents an operation in which the NMF determines whether information about the second communication node is stored in a network function of the core network (e.g., a network function including a database capable of storing information about non-terrestrial communication nodes, such as a UDR or UDM) or in its own memory. If operation 1606 determines that information about the second communication node is stored in the memory of the NMF or in another network function, the NMF can directly proceed with signaling to the base station without having to request information about the non-terrestrial communication node from the non-terrestrial network management server. Information about the second communication node may include all information necessary for the base station to change the IE of the SIB (e.g., an identifier of the non-terrestrial communication node, location information, speed information, orbit information, etc.).

[0213] Action 1608 represents an action in which, if it is determined in action 1606 that information about the second communication node is not stored, the NMF requests information about the second communication node from the non-terrestrial network management server and receives information about the second communication node through a response to the request.

[0214] Action 1610 represents an action in which the NMF transmits information about the second communication node to the first base station, and action 1612 represents an action in which the NMF receives a notification of completion of information transmission about the second communication node.

[0215] Action 16041 represents an action in which, if it is determined in action 1604 that information about the second communication node is stored in the second base station, the NMF requests the second base station to transmit information about the second communication node to the first base station.

[0216] If the second base station stores information about the second communication node, this may indicate that the second base station was connected to the second communication node. Since the first base station is also connected to the second communication node, the location of the second base station is likely not far from the first base station. Therefore, in this situation, transmitting information from the second base station to the first base station may be more advantageous than transmitting information from the NMF to the first base station. In particular, for communication services operating in countries with very large territories, the physical distance between base stations may be shorter than the physical distance between the core network and the base stations, and the transmission and reception environment between base stations may be more favorable.

[0217] Action 16042 represents an action of receiving a message from the NMF notifying that information about the second communication node has been transferred to the first base station.

[0218] Operation 16061 represents an operation in which the NMF transmits information about the second communication node to the first base station if it is determined in operation 1606 that information about the second communication node is stored. If the NMF stores information about the second communication node in its own memory, the NMF can directly transmit information about the second communication node to the first base station. If information about the second communication node is stored in a database network function such as Unified Data Management (UDM) or Unified Data Repository (UDR), the NMF can receive information about the second communication node from the UDM or UDR and transmit it to the first base station, or request the UDM or UDR to transmit information about the second communication node to the first base station. Information about the second communication node can include all information that the base station needs to change the IE of the SIB (e.g., identifier of the non-terrestrial communication node, location information, speed information, orbit information, etc.).

[0219] Action 16062 represents an action of receiving information about a second communication node in NMF that has been completed for transmission to a first base station.

[0220] From the embodiment of FIG. 16, the order of operations may be changed, and some operations may be omitted, thereby changing the embodiment. For example, the order of operations 1604 and 1606 may be changed and applied, and operations 16042, 16062, and 1612 may be omitted.

[0221] The operations of the aforementioned FIG. 16 can correspond to the operations of the NMF described in FIGS. 4 to 14.

[0222] FIG. 17 illustrates components of a network entity according to one embodiment of the present disclosure. The network entity of FIG. 17 may correspond to an AMF, NEF, or NMF of the core network described in FIGS. 4 to 14 . Additionally, the network entity of FIG. 17 may correspond to a non-terrestrial network communication node, a non-terrestrial network management server, or a non-terrestrial network management service provider.

[0223] Referring to FIG. 17, a network entity (1700) according to one embodiment includes a transceiver (1710), a processor (1730) connected to the transceiver (1710), and a memory (1720) connected to the processor (1730). The network entity (1700) of FIG. 17 can perform the operations described in FIG. 4 and FIG. 16.

[0224] The network entity (1700) may include more or fewer components than those described above. Additionally, the transceiver (1710), processor (1730), and memory (1720) may be implemented as a single chip.

[0225] The transceiver (1710) collectively refers to a receiver and a transmitter, and can transmit and receive with a base station or other network entity. The information transmitted and received may include control information, data, and other signaling information. The transceiver (1710) may include an RF transmitter for upconverting and amplifying the frequency of a transmit signal, and an RF receiver for low-noise amplification and downconverting the frequency of a receive signal. However, this is merely an example of the transceiver (1710), and the components of the transceiver (1710) are not limited to the RF transmitter and RF receiver. The transceiver (1710) may receive a signal through a wireless channel and output it to the processor (1730), and may transmit a signal output from the processor (1730) through the wireless channel.

[0226] The memory (1720) can store programs and data necessary for the operation of the device. In addition, the memory (1720) can store control information or data included in signals acquired from the device. The memory (1720) can be a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM, a DVD, or a combination of storage media.

[0227] The processor (1730) can control a series of processes so that the device operates as described above. For example, the transceiver (1810) can receive a data signal containing a message to be transmitted, and the processor (1830) can check the result of receiving the transmitted data signal.

[0228] FIG. 18 illustrates components of a base station according to one embodiment of the present disclosure.

[0229] The base station (1800) described in Fig. 18 can correspond to the base stations described in Figs. 3 to 16.

[0230] Referring to FIG. 18, a base station (1800) includes a transceiver (1810), a processor (1830) connected to the transceiver (1810), and a memory (1820) connected to the processor (1830). The base station (1800) of FIG. 18 can perform the operations described in FIGS. 4 to 15.

[0231] The base station (1800) may include more or fewer components than those described above. Additionally, the transceiver (1810), processor (1830), and memory (1820) may be implemented as a single chip.

[0232] The transceiver (1810) refers to a receiver and a transmitter, and can transmit and receive with a user terminal or network functions of a core network (e.g., AMF, NEF, NMF, etc.). The transmitted and received information may include control information, data, and other signaling information. For example, signaling information for changing SIB information according to an embodiment may be received by a base station (1800) through the transceiver (1810), and the information may be transmitted to a user terminal through the transceiver (1810). The transceiver (1810) may include an RF transmitter for up-converting and amplifying the frequency of a transmission signal, and an RF receiver for low-noise amplifying and down-converting the frequency of a reception signal. However, this is only an example of the transceiver (1810), and the components of the transceiver (1810) are not limited to an RF transmitter and an RF receiver. The transceiver (1810) can receive a signal through a wireless channel and output it to the processor (1830), and can transmit a signal output from the processor (1830) through the wireless channel.

[0233] The memory (1820) can store programs and data necessary for the operation of the device. In addition, the memory (1820) can store control information or data included in signals acquired from the device. The memory (1820) can be a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM, a DVD, or a combination of storage media.

[0234] The processor (1830) can control a series of processes so that the device operates as described above. For example, the transceiver (1810) can receive a data signal including a message transmitted from a user terminal, and the processor (1830) can check the result of receiving the transmitted data signal.

[0235] In one embodiment, a method of operating an NMF according to one embodiment of the present disclosure may include an operation of identifying that a non-terrestrial network communication node connected to a first base station has changed from a first node to a second node, an operation of determining whether information about the second node is stored, and an operation of transmitting information about the second node to the first base station based on whether information about the second node is stored.

[0236] In one embodiment, when information about the second node is not stored, the method of operating the NMF may further include an operation of requesting information about the second node from a non-terrestrial network management server and an operation of receiving information about the second node from the non-terrestrial network management server.

[0237] In one embodiment, the operation of determining whether information about the second node is stored may include the operation of determining whether information about the second node is stored in the second base station. If information about the second node is stored in the second base station, the operation of transmitting information about the second node to the first base station may include the operation of requesting the second base station to transmit information about the second node to the first base station.

[0238] In one embodiment, the operation of determining whether information about the second node is stored may further include the operation of determining whether information about the second node is stored in a memory of the second network entity or the first network entity of the core network.

[0239] In one embodiment, when information about the second node is stored in a second network entity of the core network (e.g., a network function including a database capable of storing information about non-terrestrial communication nodes, a database such as UDM or UDR), the operation of transmitting information about the second node to the first base station may include an operation of transmitting information about the second node to the first base station based on the second network entity.

[0240] In one embodiment, when information about a second node is stored in the memory of the first network entity, the operation of transmitting information about the second node to the first base station may transmit information about the second node stored in the memory to the first base station.

[0241] In one embodiment, the method of operating the NMF further includes updating management information indicating that information about a second node is stored in a second base station, the management information indicating information about a non-terrestrial network communication node stored for each base station, and the operation of determining whether information about the second node is stored in the second base station is based on the management information.

[0242] In one embodiment, the information about the second node may include at least one of identification information, location information, orbital information, and movement information of the second node.

[0243] According to embodiments of the present disclosure, even if a change occurs in a non-terrestrial network communication node or non-terrestrial network cell corresponding to a base station depending on the method of operating the non-terrestrial network cell, the quality of non-terrestrial network communication can be improved because the base station (or CU) can quickly update SIB information.

[0244] In addition, according to embodiments of the present disclosure, when a change occurs in a non-terrestrial network communication node or non-terrestrial network cell corresponding to a base station during wireless communication using a non-terrestrial network, signaling information related thereto can be transmitted in a manner that minimizes delay and has high reliability.

[0245] In addition, according to embodiments of the present disclosure, signaling efficiency can be improved by preventing duplication of information transmission by utilizing network functions or base stations of a core network that have already stored signaling information.

[0246] The various embodiments of the present disclosure and the terminology used therein are not intended to limit the technical features described in the present disclosure to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more items, unless the relevant context clearly indicates otherwise. In the present disclosure, each of the phrases "A or B," "at least one of A and B," "at least one of A or B," "A, B, or C," "at least one of A, B, and C," and "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among the phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish one component from another and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0247] The term "module" as used herein may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integrally formed component or a minimum unit or part of a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0248] Various embodiments of the present disclosure may be implemented as software (e.g., a program) including one or more commands stored in a storage medium (e.g., an internal memory (1720, 1820) or an external memory (1720, 1820)) readable by a machine (e.g., an electronic device (1700, 1800)). For example, a device (e.g., a processor of an electronic device (e.g., processor (1730, 1830)) can call at least one instruction from one or more instructions stored from a storage medium and execute it. This enables the device to operate to perform at least one function according to the called at least one instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter. A storage medium readable by the device may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not contain a signal (e.g., EM wave), and this term does not distinguish between cases where data is stored semi-permanently and cases where data is stored temporarily in the storage medium.

[0249] According to one embodiment, the method according to various embodiments disclosed in the present disclosure may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a device-readable storage medium (e.g., a compact disc read-only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0250] According to various embodiments, each component (e.g., a module or a program) of the described components may include one or more entities. According to various embodiments, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to integration. According to various embodiments, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

Claims

1. In a wireless communication system using a non-terrestrial network, a method for operating a first network entity, An action to identify that a non-terrestrial network communication node connected to a first base station has changed from a first node to a second node; An operation for determining whether information about the second node is stored; and An operation of transmitting information about the second node to the first base station based on whether information about the second node is stored. method.

2. In claim 1, The above method, if information about the second node is not stored, An action of requesting information about the second node from a non-terrestrial network management server; and Further comprising an action of receiving information about the second node from the above non-terrestrial network management server. method.

3. In claim 2, The operation of determining whether information about the second node is stored is as follows: Including an operation for determining whether information about a second node is stored in a second base station, If information about the second node is stored in the second base station, The operation of transmitting information about the second node to the first base station is: An operation including requesting the second base station to transmit information about the second node to the first base station, method.

4. In claim 2, The operation of determining whether information about the second node is stored is as follows: Further comprising an operation of determining whether information about the second node is stored in the second network entity of the core network or the first network entity. method.

5. In claim 4, If information about the second node is stored in the second network entity of the above core network, The operation of transmitting information about the second node to the first base station is: An operation of transmitting information about the second node to the first base station based on the second network entity, method.

6. In claim 4, If the first network entity stores information about the second node, The operation of transmitting information about the second node to the first base station is: Transmitting information about the second node to the first base station, method.

7. In claim 3, Further comprising an action of updating management information indicating that information about the second node is stored in the second base station; The above management information represents information about non-terrestrial network communication nodes stored for each base station. The operation of determining whether information about the second node is stored in the second base station is based on the management information. method.

8. In claim 5, The above first network entity includes an NMF (NTN management function) entity, The above second network entity, Includes a network function entity that includes a database capable of storing information on non-terrestrial network communication nodes within the core network; The information about the second node includes at least one of identification information, location information, orbital information, and movement information of the second node. method.

9. As the first network entity of a wireless communication system, Transmitter / Receiver: comprising a processor connected to the transceiver; The above processor, Identifying that a non-terrestrial network communication node connected to the first base station has changed from the first node to the second node; Determining whether information about the second node is stored; and Based on whether information about the second node is stored, configured to transmit information about the second node to the first base station, device.

10. In claim 9, The above processor, if information about the second node is not stored, Requesting information about the second node from the non-terrestrial network management server; and configured to receive information about the second node from the above non-terrestrial network management server, device.

11. In claim 10, The above processor is configured to determine whether information about the second node is stored in the second base station to determine whether information about the second node is stored, If information about the second node is stored in the second base station, configured to request the second base station to transmit information about the second node to the first base station, device.

12. In claim 10, The processor is configured to determine whether information about the second node is stored in the second network entity of the core network or the first network entity to determine whether information about the second node is stored. device.

13. In claim 12, The processor is configured to transmit information about the second node to the first base station based on the second network entity, if information about the second node is stored in the second network entity of the core network, to transmit information about the second node to the first base station, If the first network entity stores information about the second node, the first network entity is configured to transmit information about the second node to the first base station in order to transmit information about the second node to the first base station. device.

14. In claim 11, The above processor, configured to update management information indicating that information about the second node is stored in the second base station; The above management information represents information about non-terrestrial network communication nodes stored for each base station. The operation of determining whether information about the second node is stored in the second base station is based on the management information. device.

15. In claim 13, The above first network entity includes an NMF (NTN management function), The above second network entity, Includes a network function entity that includes a database capable of storing information on non-terrestrial network communication nodes within the core network, The information about the second node includes at least one of identification information, location information, orbital information, and movement information of the second node. device.

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