Method and device for dualsteer terminal to register on multiple networks

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. According to an embodiment of the present disclosure, a terminal can perform improved transmission and reception of user data by registering on a plurality of provider networks in order to use the plurality of wireless provider networks.

Description

Method and device for registering to multiple networks for a DUALSTEER terminal

[0001] The present disclosure relates to a wireless communication system, and to a method and apparatus for registering with multiple operator wireless networks to utilize the multiple operator wireless networks for enhanced user data transmission.

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

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and satisfy performance requirements for ultra-wideband services (eMBB: enhanced Mobile Broadband), ultra-reliable / ultra-low-latency communications (URLLC: Ultra-Reliable Low-Latency Communications), and massive Machine-Type Communications (mMTC), including beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple sub-carrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and polar codes for reliable transmission of control information, L2 pre-processing, and specific services. Standardization has been progressed for network slicing, which provides specialized, dedicated networks.

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

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

[0006] When such 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, which will require enhanced functions and performance of 5G mobile communication systems and integrated operation of connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, and AI (Artificial Intelligence) from the design stage and internalize end-to-end AI support functions to realize system optimization, and ultra-high-performance communication and computing resources to realize services with complexity that exceeds the limits of terminal computing capabilities. It could serve as a basis for the development of next-generation distributed computing technologies.

[0008] Meanwhile, according to one embodiment of the present disclosure, a need has arisen for a device and method capable of effectively providing a service in a wireless communication system.

[0009] The purpose of the present invention is to provide a method and device for providing a Multiple Access Connectivity service to a user by using a wireless network operated by a plurality of mobile communication service providers in a wireless communication system.

[0010] In accordance with one embodiment of the present disclosure, a method performed by an access and mobility management function (AMF) entity associated with a visited public land mobile network (VPLMN) in a wireless communication system may include: receiving, from a base station that has received a registration request message from a terminal, a first message requesting registration of the terminal for a VPLMN network; transmitting, to a unified data management (UDM) entity, a second message including registration type information and HPLMN (home PLMN) information to register the terminal, the registration type information indicating initial registration for a dual steer, and the HPLMN information including at least one of an HPLMN identifier or a terminal identifier of the HPLMN; receiving, from the UDM, a third message including subscriber information of the terminal; and generating, based on the received subscriber information of the terminal, terminal context (UE context) information associated with a VPLMN for the dual steer.

[0011] Meanwhile, in a wireless communication system according to an embodiment of the present disclosure, an access and mobility management function (AMF) entity associated with a VPLMN (visited public land mobile network) may be an AMF entity associated with a VPLMN, including a transceiver; and a control unit configured to receive, from a base station that has received a registration request message from a terminal, a first message requesting registration of the terminal for a VPLMN network through the transceiver, and to transmit, to a unified data management (UDM) entity, a second message including registration type information and HPLMN (home PLMN) information to register the terminal, wherein the registration type information indicates initial registration for a dual steer, and the HPLMN information includes at least one of an HPLMN identifier or a terminal identifier of the HPLMN, receive a third message including subscriber information of the terminal from the UDM, and control to generate terminal context (UE context) information associated with a VPLMN for the dual steer based on the received subscriber information of the terminal.

[0012] According to one embodiment of the present disclosure, a device and method for effectively providing a service in a wireless communication system are provided.

[0013] FIG. 1 is a diagram illustrating the structure of a 5G network according to an embodiment of the present disclosure;

[0014] FIG. 2 is a diagram illustrating the structure of a 5G network for supporting ATSSS (access traffic steering, switching, splitting) service according to one embodiment of the present disclosure.

[0015] FIG. 3 is a diagram illustrating a terminal structure including a function for using an ATSSS service according to an embodiment of the present disclosure;

[0016] FIG. 4 is a diagram illustrating a method for providing a network connection service to a user using two different mobile communication service provider wireless networks according to one embodiment of the present disclosure;

[0017] FIG. 5 is a diagram illustrating a method for a DualSteer terminal to register with two mobile communication networks and use a Multi-access Connectivity service according to one embodiment of the present disclosure.

[0018] FIG. 6a is a diagram illustrating a procedure for a DualSteer terminal in an HPLMN to request MA PDU Session over Multiple PLMNs setup according to an embodiment of the present disclosure;

[0019] FIG. 6b is a diagram illustrating a procedure for a DualSteer terminal in an HPLMN to request MA PDU Session over Multiple PLMNs setup according to an embodiment of the present disclosure;

[0020] FIG. 6c is a diagram illustrating a procedure for a DualSteer terminal in an HPLMN to request MA PDU Session over Multiple PLMNs setup according to an embodiment of the present disclosure;

[0021] FIG. 7a is a diagram illustrating a VPLMN network registration procedure of a terminal according to an embodiment of the present disclosure;

[0022] FIG. 7b is a diagram illustrating a VPLMN network registration procedure of a terminal according to an embodiment of the present disclosure;

[0023] FIG. 7c is a diagram illustrating a VPLMN network registration procedure of a terminal according to an embodiment of the present disclosure;

[0024] Figure 8a is a diagram illustrating a procedure in which a terminal requests an MA PDU Session over Multiple PLMNs in a VPLMN.

[0025] Figure 8b is a diagram illustrating a procedure in which a terminal requests an MA PDU Session over Multiple PLMNs in a VPLMN.

[0026] Figure 8c is a diagram illustrating a procedure in which a terminal requests an MA PDU Session over Multiple PLMNs in a VPLMN.

[0027] Figure 8d is a diagram illustrating a procedure in which a terminal requests an MA PDU Session over Multiple PLMNs in a VPLMN.

[0028] FIG. 9 is a diagram for suggesting several ways for an AMF to select H-AMF and H-SMF in a VPLMN according to one embodiment of the present disclosure;

[0029] Figure 10 is a diagram showing the configuration of a terminal according to an embodiment of the present disclosure.

[0030] FIG. 11 is a diagram illustrating a configuration of a base station or network entity according to an embodiment of the present disclosure.

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. It should be noted that, where possible, identical components are represented by identical reference numerals throughout the attached drawings. Furthermore, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted.

[0032] In describing the embodiments herein, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present invention will be omitted. This is to avoid obscuring the gist of the present disclosure by omitting unnecessary explanations and to convey the gist more clearly.

[0033] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0034] The advantages and features of the present disclosure, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. The embodiments are provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

[0035] Furthermore, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0036] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, the downlink (DL) refers to a wireless transmission path of a signal transmitted from the base station to the terminal, and the uplink (UL) refers to a wireless transmission path of a signal transmitted from the terminal to the base station. In addition, although LTE, LTE-A, or 5G systems may be described as examples below, embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems through some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0037] At this time, it will be understood that each block of the processing flow diagrams and combinations of the flow diagrams can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flow diagram block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flow diagram block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0038] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0039] Here, the term '~ unit' used in the present embodiment means a software or hardware component such as an FPGA or ASIC, and the '~ unit' performs certain roles. However, the '~ unit' is not limited to software or hardware. The '~ unit' may be configured to be on an addressable storage medium and may be configured to regenerate one or more processors. Thus, as an example, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, the components and '~ units' may be implemented to regenerate one or more CPUs within a device or a secure multimedia card. Additionally, in the embodiment, '~bu' may include one or more processors.

[0040] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP's HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e.

[0041] As a representative example of the above broadband wireless communication system, the LTE system adopts the Orthogonal Frequency Division Multiplexing (OFDM) method in the downlink (DL) and the Single Carrier Frequency Division Multiple Access (SC-FDMA) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B, gNode B, or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method can distinguish the data or control information of each user by allocating and operating the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality.

[0042] As a future communication system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra-Reliable Low Latency Communication (URLLC).

[0043] eMBB aims to provide data transmission rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to support a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. Furthermore, 5G communication systems must simultaneously provide the peak data rate and an increased user-perceived data rate for terminals. To meet these requirements, improvements in various transmission and reception technologies, including improved multi-input, multi-output (MIMO) transmission technology, are required. Furthermore, while LTE transmits signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by using a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz band.

[0044] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the IoT, mMTC requires supporting large-scale terminal connections within a cell, improved terminal coverage, improved battery life, and reduced terminal costs. The IoT requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km^2) within a cell, as it provides communication capabilities through the attachment of various sensors and devices. Furthermore, terminals supporting mMTC are likely to be located in shadow areas, such as basements, beyond cell coverage due to the nature of the service, and thus may require wider coverage than other services provided by 5G communication systems. Terminals supporting mMTC must be inexpensive, and since frequent battery replacement is unlikely, they may require extremely long battery lifespans, such as 10 to 15 years.

[0045] Finally, URLLC refers to cellular-based wireless communication services used for specific mission-critical purposes. Examples include remote control of robots or machinery, industrial automation, unmanned aerial vehicles (UAVs), remote health care, and emergency alerts. Therefore, URLLC communications must offer extremely low latency and high reliability. For example, services supporting URLLC must meet air interface latency requirements of less than 0.5 milliseconds and a packet error rate (PER) of less than 10^-5. Therefore, for services supporting URLLC, 5G systems must provide shorter transmission time intervals (TTIs) than other services, and design requirements may require the allocation of extensive resources in the frequency band to ensure communication link reliability.

[0046] The three 5G services, eMBB, URLLC, and mMTC, can be multiplexed and transmitted within a single system. To meet the different requirements of each service, different transmission and reception techniques and parameters can be used. Of course, 5G is not limited to the three services described above.

[0047] In this disclosure, phrases such as “A and / or B,” “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 each include any one of the items listed together in that phrase, or all possible combinations thereof. Terms such as “first,” “second,” or “first” or “second” may be used merely to distinguish the corresponding component from other corresponding components and do not limit the corresponding components in any other respect (e.g., importance or order).

[0048] Hereinafter, the base station is an entity that performs resource allocation of a terminal, and may be at least one of a Node B, a BS (Base Station), an eNB (eNode B), a gNB (gNode B), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In addition, the embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel form to the embodiments of the present disclosure described below. In addition, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure at the discretion of a person having skilled technical knowledge.

[0049] In the present disclosure, network technology may refer to standard specifications defined by the International Telecommunication Union (ITU) or 3GPP (e.g., TS 23.501, TS 23.502, TS 23.503, etc.), and components included in the network structure of FIG. 1 may each mean a physical entity, or may mean software performing an individual function, or hardware combined with software. Reference symbols shown as Nx, such as N1, N2, N3, ... in the drawings, represent known interfaces between NFs in a 5G core network (CN), and since a related description may refer to the standard specification (TS 23.501), a detailed description will be omitted.

[0050] In the following description, terms used to identify connection nodes, terms referring to network entities (NEs) or network functions (NFs), terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc. are provided as examples for convenience of explanation. Therefore, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0051] For convenience of explanation, some terms and names defined in the 3rd generation partnership project long-term evolution (3GPP) standards may be used. However, the present disclosure is not limited to these terms and names, and can be equally applied to systems conforming to other standards.

[0052] FIG. 1 is a diagram showing an example of a configuration of a wireless communication system according to an embodiment of the present disclosure, and illustrates the configuration of a 5G system as an example.

[0053] Referring to FIG. 1, a 5G network may include network entities (NE) or network functions (NF) described below.

[0054] (R)AN ((Radio) Access Network) is an entity that performs wireless resource allocation of a terminal, and may be at least one of an eNode B, a Node B, a BS (Base Station), an NG-RAN (Next Generation Radio Access Network), a 5G-AN (5G Access Network), a 5G NR (5G New Radio), a radio access unit, a base station controller, or a node on a network.

[0055] A terminal may include a UE (User Equipment), NG UE (Next Generation UE), MS (Mobile Station), cellular phone, smartphone, computer, IoT (Internet of Things) device, or multimedia system capable of performing a communication function.

[0056] Furthermore, while the embodiments of the present disclosure are described below using a 5G system as an example, the embodiments of the present disclosure can also be applied to other communication systems with similar technical backgrounds. Furthermore, the embodiments of the present disclosure can be applied to other communication systems with some modifications, as determined by a person skilled in the art, without significantly departing from the scope of the present disclosure.

[0057] As wireless communication systems evolve from 4G to 5G, a new core network (CN) called the Next Generation Core (NG Core) or 5GC (5G Core Network) is being defined. This new core network virtualizes all existing network entities (NEs) into network functions (NFs). According to one embodiment of the present disclosure, a network function may refer to a network entity, a network component, or a network resource.

[0058] According to one embodiment of the present disclosure, 5GC may include NFs as illustrated in FIG. 1. Of course, the present invention is not limited to the example of FIG. 1, and 5GC may include more or fewer NFs than the NFs illustrated in FIG. 1.

[0059] The Access and Mobility Management Function (AMF) may be a network function that manages the access and mobility of a terminal (UE). For example, AMF may perform network functions such as terminal registration, connection, reachability, mobility management, access verification, authentication, and mobility event generation.

[0060] The Session Management Function (SMF) may be a network function that manages the Packet Data Network (PDN) connection provided to the user equipment (UE). The PDN connection may be referred to as a Protocol Data Unit (PDU) Session. For example, the SMF may perform network functions such as session management through the establishment, modification, and release of sessions and the maintenance of tunnels between the UPF and the RAN required for this; user plane (UP) selection and control; traffic processing control in the UPF; and charging data collection control.

[0061] PCF (Policy Control Function) may be a network function that applies the mobile carrier's service policy, charging policy, and PDU Session policy to the terminal.

[0062] Unified Data Management (UDM) can be a network function that stores subscriber information. For example, UDM can perform functions such as generating authentication information for 3GPP security, processing user identifiers (User IDs), managing a list of network functions supporting UEs, and managing subscription information.

[0063] The Network Exposure Function (NEF) may provide information about a terminal to a server outside the 5G network. Additionally, NEF may provide the information necessary for 5G network services and store it in the Unified Data Repository (UDR).

[0064] The User Plane Function (UPF) may function as a gateway that transmits user data (PDU) to the Data Network (DN). More specifically, the UPF may process data so that it can transmit data transmitted by a terminal to an external network or transmit data received from an external network to the terminal. For example, the UPF may perform network functions such as serving as an anchor between Radio Access Technologies (RATs), packet routing and forwarding, packet inspection, user plane policy application, traffic usage report generation, and buffering.

[0065] NRF (Network Repository Function) can store the profiles of NFs and perform the function of discovering NFs.

[0066] AUSF (Authentication Server Function) can perform terminal authentication in 3GPP access networks and non-3GPP access networks.

[0067] NSSF (Network Slice Selection Function) can perform the function of selecting a Network Slice Instance provided to a terminal.

[0068] The Network Data Analytics Function (NWDAF) collects data from multiple NFs (Network Functions) to ensure efficient operation of the 5GC network. This data is analyzed using a machine learning (ML) model, and the results are provided back to the NFs, helping them provide efficient network services.

[0069] An Application Function (AF) can communicate with a network operator to enable external servers (Application Servers) to utilize network services provided by the network operator. Depending on the deployment entity, AFs can be divided into internal AFs and external AFs. Internal AFs deployed by network operators can communicate directly with NFs within the network operator. AFs deployed by third-party service providers (3rd-party service providers) must go through an NEF to communicate with NFs within the network operator.

[0070] DN (Data Network) can be a data network where terminals transmit and receive data to use network operator services or third-party services.

[0071] A terminal according to one embodiment of the present disclosure may include an IoT device. The IoT device may include a device that does not use battery power or operates with very little power, and such an IoT device is referred to as an ambient IoT device (or simply Ambient IoT).

[0072] According to one embodiment of the present disclosure, a mobile communication service provider can transmit user data using two or more radio networks (Radio Access) to provide users with enhanced network connectivity services (multi-access connectivity services). In particular, the mobile communication service provider can utilize not only its own radio network but also the radio networks of other mobile communication service providers to provide enhanced data transmission services using multiple radio networks. The present disclosure proposes a method and device for providing users with multi-access connectivity services using multiple operator networks.

[0073] FIG. 2 illustrates the structure of a 5G network for supporting access traffic steering, switching, splitting (ATSS) service according to one embodiment of the present disclosure.

[0074] According to one embodiment of the present disclosure, a terminal can transmit user data to a network using two or more wireless networks ((R)AN: (Radio) Access Network). At this time, the (R)AN used by the terminal can be classified into an Access Type and a Radio Access Technology (RAT) Type. The Access Type is classified into 3GPP Access and Non-3GPP Access. Non-3GPP Access can include all wireless connection networks other than 3GPP Access. For example, WLAN (Wireless Local Access Network) is a representative Non-3GPP Access. In addition, 3GPP Access can be classified into various types of RAT. According to one embodiment, 3GPP Access can include 5G NR, E-UTRA (Evolved UTRA), UTRA (Universal Terrestrial Radio Access), etc., and can also include various 3GPP wireless connection networks.

[0075] FIG. 2 illustrates an architecture reference model for ATSSS (Access Traffic Steering, Switching, Splitting) technology defined in the 3GPP Release 18 standard according to one embodiment.

[0076] A network can provide multi-access connectivity service to a terminal by using two wireless connection networks (3GPP Access and Non-3GPP Access). For this purpose, the terminal can create a MA PDU Session (Multi-Access PDU Session) that includes two independent N3 / N9 tunnels. The terminal can use the MA PDU Session to perform traffic steering (a method of selecting one of the two wireless connection networks to transmit service data flow data), traffic switching (a method of switching service data flow data being transmitted using one wireless connection network to another wireless connection network and transmitting it), and traffic splitting (a method of dividing the data of one service data flow and transmitting it using two wireless connection networks simultaneously) operations based on the ATSSS rule.

[0077] In order for a terminal and a UPF to perform steering, switching, or splitting operations on service data flow data using an MA PDU Session, the terminal must include at least one of the following functions: MPTCP (Multipath TCP (transmission control protocol)) functionality, MPQUIC (Multipath QUIC (quick UDP (user datagram protocol) internet connections)) functionality, or ATSSS-LL (ATSSS Low-Layer) functionality. And the UPF must include at least one of the following functions: MPTCP Proxy functionality, MPQUIC Proxy functionality, or ATSSS-LL functionality.

[0078] The above-mentioned features can simultaneously transmit data from a single service data flow across two tunnels (e.g., two paths), and merge the data transmitted simultaneously across both paths into a single data flow. By transmitting data across two paths, terminals can expect improved data throughput.

[0079] FIG. 3 illustrates a terminal structure including a function for using an ATSSS service according to one embodiment of the present disclosure.

[0080] To use the ATSSS service, the terminal may include at least one of the following functions.

[0081] - MPTCP(Multipath TCP) functionality

[0082] - MPQUIC (Multipath QUIC) functionality

[0083] - ATSSS-LL(ATSSS Low-Layer) functionality.

[0084] The terminal can utilize the MPTCP function for service data flows using the Transmission Control Protocol (TCP) protocol and the MPQUIC function for service data flows using the User Datagram Protocol (UDP) protocol. Additionally, the terminal can utilize the ATSSS-LL function for all service data flows using the TCP, UDP, or Ethernet protocols.

[0085] Each function can support simultaneous transmission of a single service data flow into two subflows over two wireless networks (Non-3GPP Access and 3GPP Access) to provide multi-access connectivity services to terminals. Each subflow of the MPTCP and MPQUIC functions can be assigned a separate IP address. The ATSSS-LL function can transmit data over two wireless networks using a single IP address.

[0086] The functions provided by the ATSSS service for each service data flow can be determined by the ATSSS Rules. The functions provided by the ATSSS service are as follows: Traffic Steering (a method of selecting one of two wireless connection networks to transmit service data flow data), Traffic Switching (a method of changing service data flow data being transmitted using one wireless connection network to another wireless connection network and transmitting it), and Traffic Splitting (a method of dividing the data of one service data flow into two and transmitting it using two wireless connection networks simultaneously).

[0087] This disclosure proposes a method for extending multi-access connectivity services (e.g., ATSSS services) provided to terminals using one 3GPP Access network and one Non-3GPP Access network. For example, a terminal can receive multi-access connectivity services using two 3GPP Access networks, two Non-3GPP Access networks, or two different mobile communication service providers.

[0088] FIG. 4 is a diagram illustrating a method for providing network connection services to users using two different mobile communication service provider wireless networks according to one embodiment of the present disclosure.

[0089] Referring to Fig. 4, a terminal can use a network connection service using two different mobile communication service provider's Public Land Mobile Network (PLMN) A and PLMN B. At this time, the terminal can use each 3GPP Access network, 5G NR network, and 4G EUTRA network provided by each mobile communication service provider. In order to transmit data of the terminal's service data flow, the 5G network can establish a PDU Session, and the 4G network can establish a PDN Connection. Data transmitted using each 3GPP Access network can be transmitted to the PSA (PDU Session Anchor) UPF, which includes the ATSSS (Access Traffic Steering, Switching, Splitting) function, through the UPF and P-GW (Packet Data Network Gateway). The PSA UPF can reassemble the data that was divided using the MPTCP, MPQUIC, or ATSSS-LL function into a single service data flow and transmit it to the Data Network. At this time, each session in 5G and 4G can be included in one MA PDU Session.

[0090] Extended ATSSS utilizes two 3GPP access networks, offering improved services to terminals compared to the existing ATSSS, which utilizes one 3GPP access network and one non-3GPP access network. This service improvement by Extended ATSSS can be attributed to the fact that non-3GPP access networks primarily use unlicensed bands to transmit data and do not provide Quality of Service (QoS) for improved transmission services.

[0091] In this disclosure, we propose a method for a DualSteer terminal, among terminals capable of using traffic steering and switching services using two 3GPP access networks, to register with a mobile communication network and establish a session to use multi-access connectivity services. A DualSteer terminal is a terminal equipped with a multi-USIM and can register with two mobile communication networks to receive network services. According to one embodiment, simultaneous data transmission and reception from the two networks is not possible, and two SUPIs (Subscription Permanent Identifiers) can be used to share subscriber information of a single mobile communication network.

[0092] FIG. 5 is a diagram illustrating a method in which a DualSteer terminal registers with two mobile communication networks and uses a Multi-access Connectivity service according to one embodiment of the present disclosure.

[0093] A DualSteer terminal may include two USIMs, one for the HPLMN network and one for the VPLMN network. In one embodiment, the HPLMN terminal ID may be SUPI#1 and the VPLMN terminal ID may be SUPI#2. The terminal may register with the HPLMN to use network services. At this time, the terminal may register with the VPLMN to use the Multi-access Connectivity service. In one embodiment, the VPLMN network may use the terminal subscriber information of the HPLMN to provide the Multi-access Connectivity service to the terminal.

[0094] FIGS. 6A to 6C are diagrams illustrating a procedure for a DualSteer terminal in an HPLMN to request MA PDU Session over Multiple PLMNs setup according to one embodiment of the present disclosure.

[0095] In Step 1, the terminal may transmit a PDU Session Establishment Request message to the network to request the establishment of an MA PDU Session over Multiple PLMNs. For example, the terminal may transmit the PDU Session Establishment Request message to the AMF entity of the network. The Request Type of the request message may be set to “MA PDU Request_DualSteer_Multi-USIM” and may further include the following information.

[0096] - VPLMN Information (VPLMN ID, GPSI of UE in VPLMN)

[0097] In step 2, if the AMF does not support the MA PDU Request_DualSteer_Multi-USIM feature, it can retransmit the terminal's request to an AMF that supports the feature. If the AMF that receives the request message supports the feature, it can decide whether to accept the terminal's request based on the terminal's subscription information (e.g., Access and Mobility Subscription data) received from the UDM. If the AMF accepts the terminal's request, the AMF can select an SMF that supports MA PDU Request_DualSteer_Multi-USIM.

[0098] According to one embodiment of the present disclosure, the AMF can generate a UE context for VPLMN to be used by the (V)AMF of the VPLMN based on the terminal subscriber information received from the UDM. Alternatively, the AMF can request the UE context for VPLMN from the UDM. Furthermore, the AMF can generate an AM Policy and UE Policy for VPLMN to be applied to the terminal in the VPLMN based on the AM Policy information and UE Policy information of the HPLMN. Alternatively, the AMF can request the AM Policy and UE Policy for VPLMN from the (H)PCF.

[0099] In step 3, the AMF may send an Nsmf_PDUSession_CreateSMFContext Request message to the selected SMF. The request message may include an “MA PDU Request_DualSteer_Multi-USIM” Indication and may also include whether the terminal is registered in another PLMN.

[0100] In step 4, the SMF can obtain subscriber information (e.g., Session Management subscription data) from the UDM and, based on the subscriber information, determine whether MA PDU Sessions can be established using multiple 3GPP Access networks. The SMF can store the VPLMN ID and the terminal GPSI of the VPLMN in the UDM. Based on the terminal subscriber information received from the UDM, the SMF can create an SM context for the VPLMN to be used by the (V)SMF of the VPLMN. Alternatively, the SMF can request an SM context for the VPLMN from the UDM.

[0101] In step 5, SMF can send an Nsmf_PDUSession_CreateSMFContext Response message to AMF.

[0102] In step 6, the authentication / authorization procedure of the PDU Session can be performed.

[0103] In step 7a, the SMF may select a PCF. In step 7b, SM Policy Association Establishment or SM Policy Association Modification initiated by the SMF may be performed.

[0104] In steps 7a and 7b above, the SMF performs PCF selection, and if dynamic PCC is used, the SMF may send the “MA PDU Request_DualSteer_Multi-USIM” Indication to the PCF. The PCF may provide the SMF with PCC rules containing MA PDU Session control information.

[0105] In step 8, the SMF may select two UPFs, including one UPF or an intermediate UPF. In one embodiment, if the SMF selects one UPF, the selected UPF may handle the MA PDU Session. Alternatively, if the SMF selects two UPFs, the intermediate UPF may handle the PDU Session and the other UPF may handle the MA PDU Session.

[0106] At step 9, an SMF initiated SM Policy Association Notification may be performed.

[0107] In step 10a, the SMF may send the N4 rules for MA PDU Session over two 3GPP access networks to the UPF. And in step 10b, the SMF may receive a response message from the UPF.

[0108] In step 11, the SMF may send an “MA PDU Session Accepted” Indication to the AMF. The AMF may mark the PDU Session as an MA PDU Session over Multiple PLMNs.

[0109] In step 12, the AMF may transmit the N2 PDU session request message to (R)AN as a NAS message.

[0110] In step 13, the terminal may receive a PDU Session Establishment Accept message. The message may include an "MA PDU session over two 3GPP access networks Accepted" indication. The message may include an ATSSS rule for MA PDU Session and may also include the responsible SMF ID.

[0111] Steps 14 to 21 are procedures based on general technology, so specific details are omitted.

[0112] FIGS. 7A to 7C are diagrams illustrating a VPLMN network registration procedure of a terminal according to an embodiment of the present disclosure.

[0113] In step 1, the terminal may transmit a Registration Request message to the base station (R)AN. The Registration Request message may include at least one of the following parameters: AN message (AN parameters, Registration Request (Registration type, SUCI or 5G-GUTI or PEI, [last visited TAI (if available)], Security parameters, [Requested NSSAI], [Mapping Of Requested NSSAI], [Default Configured NSSAI Indication], [UE Radio Capability Update], [UE MM Core Network Capability], [PDU Session status], [List Of PDU Sessions To Be Activated], [Follow-on request], [MICO mode preference], [Requested Active Time], [Requested DRX parameters for E-UTRA and NR], [Requested DRX parameters for NB-IoT], [extended idle mode DRX parameters], [LADN DNN(s) or Indicator Of Requesting LADN Information], [NAS message container], [Support for restriction of use of Enhanced Coverage], [Preferred Network Behavior], [UE paging probability information], [Paging Subgrouping Support Indication], [UE Policy Container (list of PSIs, indication of UE support for ANDSP,operating system identifier, Indication of URSP Provisioning Support in EPS, UE capability of reporting URSP rule enforcement to network, UE capability of supporting VPLMN-specific URSP rules)] and [UE Radio Capability ID], [Release Request indication], [Paging Restriction Information], PEI, [PLMN with Disaster Condition], [Requested Periodic Update time], [Unavailability Period Duration], [Start of Unavailability Period], [Unavailability Type])).,

[0114] If (R)AN is NG-RAN, AN (Access Network) parameters may include at least one of the following values: 5G-S-TMSI or GUAMI, Selected PLMN ID (or PLMN ID and NID) and NSSAI information, Establishment cause.

[0115] 5G-S-TMSI (5G S-Temporary Mobile Subscription Identifier) ​​is a type of terminal ID and is an abbreviated form of 5G-GUTI (5G Globally Unique Temporary Identifier). 5G-S-TMSI consists of an AMF Set ID, AMF Pointer, and 5G-TMSI and is used in wireless signaling procedures.

[0116] GUAMI (Globally Unique AMF Identifier) ​​is a type of AMF ID that can identify one or more AMFs. GUAMI consists of MCC, MNC, AMF Region ID, AMF Set ID, and AMF Pointer.

[0117] A Public Land Mobile Network (PLMN) ID is the mobile carrier's ID. It consists of a Mobile Country Code (MCC) and a Mobile Network Code (MNC).

[0118] NID (Network identifier) ​​is an ID used to identify a SNPN (Stand-alone Non-public Network). The PLMN ID and NID are used together to identify the SNPN.

[0119] The values ​​included in NSSAI (Network Slice Selection Assistance Information) Information are determined by the Access Stratum Connection Establishment NSSAI Inclusion Mode parameter provided by AMF.

[0120] The Establishment Cause value indicates the purpose for which the terminal requested the creation of an RRC (Radio Resource Control) connection. According to one embodiment of the present disclosure, the Establishment Cause may be set to the value “Initial Registration_DualSteer.”

[0121] If the terminal is an IAB (Integrated access and backhaul) node connecting to 5GS, the AN parameter must include IAB-Indication.

[0122] If the terminal is part of a Mobile Base Station Relay (MBSR) node, the AN parameter must include the MBSR Indication.

[0123] The Registration type value indicates the purpose for which the terminal requests registration. The Registration type value may be set to one of the following values: Initial Registration, Mobility Registration Update, Periodic Registration Update, Emergency Registration, Disaster Roaming Initial Registration, or Disaster Roaming Mobility Registration Update. According to one embodiment of the present disclosure, the Registration type may be set to the value “Initial Registration_DualSteer.”

[0124] SUCI (Subscription Concealed Identifier) ​​is a form of terminal ID that includes a concealed SUPI (Subscription Permanent Identifier) ​​value to prevent leakage of the SUPI value.

[0125] 5G-GUTI (5G Globally Unique Temporary Identifier) ​​is a type of terminal ID assigned to a terminal by the AMF. 5G-GUTI consists of GUAMI and 5G-TMSI.

[0126] The Permanent Equipment Identifier (PEI) identifies the Mobile Equipment (ME). If the terminal supports at least one 3GPP access technology (i.e., NG-RAN, E-UTRAN, UTRAN, or GERAN), the PEI must be set to the International Mobile Equipment Identity (IMEI) or International Mobile Equipment Identity-Software Version (IMEISV).

[0127] The last visited TAI (Tracking Area Identity) indicates the TAI value that the terminal last visited. The AMF uses this last visited TAI value to determine the terminal's RA (Registration Area).

[0128] Security parameters values ​​are used for terminal authentication and integrity protection.

[0129] The Requested NSSAI value includes the S-NSSAI(s) (Single Network Slice Selection Assistance Information) value corresponding to the Network Slice(s) that the terminal wishes to use.

[0130] The Mapping Of Requested NSSAI value contains the value of HPLMN S-NSSAI.

[0131] When a terminal uses Evolved UTRA (E-UTRA), it indicates whether it supports CIoT (Cellular IoT) 5GS Optimizations. The support indicated by the terminal affects AMF selection.

[0132] If the terminal performs Initial Registration or Disaster Roaming Registration, the terminal must indicate its identity in the Registration Request message as follows.

[0133] i. If the terminal has a valid EPS (Evolved Packet System) GUTI, the 5G-GUTI mapped to it

[0134] ii. If available, the native 5G-GUTI allocated by the PLMN with which the terminal is attempting to register.

[0135] iii. If possible, the native 5G-GUTI allocated by the equivalent PLMN of the PLMN in which the terminal is attempting to register.

[0136] iv. If possible, native 5G-GUTI allocated by another PLMN.

[0137] v. If none of the above is possible, the terminal must include its SUCI in the Registration Request message.

[0138] In this disclosure, a terminal may include HPLMN Information (HPLMN ID and terminal GPSI of HPLMN) values ​​in a message. Additionally, a follow-on request may be included to inform the network that the terminal will immediately create a PDU Session after registration.

[0139] In step 2, the NG-RAN, which is the base station, can check the Establishment cause value “Initial Registration_DualSteer” in the AN parameter and select the AMF that supports Initial Registration_DualSteer and MA PDU Request_DualSteer_Multi_USIM.

[0140] In step 3, the NG-RAN may send a Registration Request message to the selected AMF.

[0141] In step 4, the selected AMF can send a Namf_Communication_UEcontextTransfer message to the old AMF. And in step 5, the selected AMF can receive a Namf_Communication_UEcontextTransfer response message from the old AMF.

[0142] In step 6, the selected AMF may transmit an Identity request message to the terminal. In step 7, the selected AMF may receive an Identity response message from the terminal. In step 8, the selected AMF may select an AUSF.

[0143] In step 9, AMF can perform Mutual Authentication using the terminal SUPI of the VPLMN.

[0144] In step 10, the AMF can send a Namf_Communication_RegistrationCompleteNotify message to the old AMF. And in step 11, the AMF can transmit and receive an Identity request message and an Identity response message to and from the terminal.

[0145] In step 12, the AMF may perform N5g-eir_EquipmentIdentityChenk_Get with the equipment identity register (EIR).

[0146] In step 13, the AMF can perform UDM selection.

[0147] In step 14a, if the terminal has not yet been registered with the UDM, the AMF may register the terminal with the UDM by sending the Nudm_UECM_Registration message to the UDM. The Registration type may be set to “Initial Registration_DualSteer” and may include HPLMN Information (HPLMN ID and terminal GPSI of the HPLMN).

[0148] In step 14b, the AMF can retrieve subscriber information (e.g., Access and Mobility Subscription data) of the terminal from the UDM. Based on the received subscriber information, the AMF can generate (V)UE context for DualSteer information.

[0149] At step 14c, AMF can send a Nudm_SDM_Subscribe message to UDM.

[0150] In step 14c-2, the AMF may send a Namf_UEContextDualSteer_Get message to the (H)AMF. The AMF may receive (H)UE context for DualSteer information, (H)AM Policy, and (H)UE Policy for DualSteer from the (H)AMF. The AMF may retrieve the (H)AMF of the terminal using the HPLMN Information (HPLMN ID and terminal GPSI of HPLMN) information received from the terminal and the (H)UDM or (H)NRF.

[0151] In step 14d, the old AMF may receive a Nudm_UECM_DeregistrationNotify message from the UDM. And in step 14e, the old AMF may send a Nudm_SDM_Unsubscribe message to the UDM.

[0152] In step 15, the AMF can perform PCF selection.

[0153] In step 16, the AMF may perform the AM Policy Association Establishment for DualSteer procedure with the PCF. For this establishment, the AMF may send a DualSteer indication to the PCF.

[0154] In step 17, the AMF may send an Nsmf_PDUSession_UpdateSMContext / Nsmf_PDUSession_ReleaseSMContext message to the SMF. In addition, in step 18, the AMF may send a UE Context Notification Request message to the N3IWF / TNGF. And in step 19, the AMF may receive a UE Context Notification Response message from the N3IWF / TNGF.

[0155] In step 19a, the AMF may send a Nudm_UECM_Registration message to the UDM. In step 19b, the UDM may send a Nudm_UECM_DeregistrationNotify message to the old AMF. And in step 19c, the old AMF may send a Nudm_SDM_Unsubscribe message to the UDM.

[0156] In step 21, the AMF may send a Registration Accept message to the terminal. The Registration Accept message may include an Initial Registration_DualSteer support Indication. The Indication value may include whether the network provides the DualSteer function to the terminal.

[0157] In step 21b, the AMF can perform UE Policy Association Establishment with the PCF. In step 22, the terminal that received the Registration Accept message can send a Registration Complete message to the AMF.

[0158] In step 23, the AMF can send and receive Nudm_SDM_info to UDM. And in step 23a, the AMF can send an N2 message to (R)AN.

[0159] At step 24, the AMF may send a Nudm_UEDM_Update message to the UDM.

[0160] And at step 25, Network slice-specific authentication and authorization can be performed between the terminal and the AMF.

[0161] Meanwhile, FIGS. 8a to 8d are diagrams illustrating a procedure in which a terminal requests an MA PDU Session over Multiple PLMNs in a VPLMN according to one embodiment of the present disclosure.

[0162] In Step 1, the terminal can send a PDU Session Establishment Request message to the VPLMN network. The Request Type can be set to “MA PDU Request_DualSteer_Multi-USIM.” In addition, the request message can further include HPLMN Information (HPLMN ID and terminal GPSI of HPLMN). In addition, the request message can further include the PDU Session ID and SMF ID of the MA PDU Session established in the HPLMN.

[0163] In step 2, if the AMF does not support MA PDU session over two 3GPP access networks, the AMF may retransmit the request from the terminal to an AMF that supports it. In one embodiment, the AMF may select a V-SMF that can support MA PDU session over two 3GPP access networks. Additionally, the AMF may select an H-SMF that is responsible for the MA PDU session over two 3GPP access networks configured by the terminal in the HPLMN. The AMF may search for the (H)SMF using the HPLMN Information (HPLMN ID and terminal GPSI of HPLMN) received from the terminal and the (H)UDM or (H)NRF.

[0164] In step 3a, the AMF may send the Nsmf_PDUSession_CreateSMContextRequest message to the V-SMF. In one embodiment, the AMF may provide the V-SMF with at least one of the "MA PDU Request_DualSteer_Multi-USIM" indication, (H)SMF ID, HPLMN ID, UE GPSI of HPLMN, and SMF ID of the H-SMF.

[0165] And in step 3b, AMF can receive Nsmf_PDUSession_CreateSMContextRequest message from V-SMF.

[0166] In step 4, V-SMF can select UPF from VPLMN.

[0167] In steps 5a and 5b, the V-SMF may transmit an establishment request for an N4 session to the selected UPF and receive a response to the request.

[0168] In step 6, the V-SMF may send an Nsmf_PDUSession_CreateRequest message to the H-SMF. In one embodiment, the V-SMF may send at least one of the following information to the H-SMF:

[0169] - V-SMF SM Context ID, V-SMF ID, V-CN Tunnel Info, AMF ID.

[0170] In step 7, the H-SMF can retrieve the terminal's subscription information from the UDM. Additionally, the H-SMF can store HPLMN Information (HPLMN ID and terminal GPSI of HPLMN) information in the UDM.

[0171] In step 8, PUD session Authentication / Authorization can be performed.

[0172] In steps 9a and 9b, the H-SMF performs PCF selection, and if dynamic PCC is used, the SMF may send the “MA PDU Request_DualSteer_Multi-USIM” Indication to the PCF. The PCF may provide the SMF with PCC rules containing MA PDU Session control information.

[0173] In step 10, the H-SMF can select two UPFs, including one UPF or an intermediate UPF. If the H-SMF selects one UPF, the selected UPF can handle the MA PDU Session. Alternatively, if the H-SMF selects two UPFs, the intermediate UPF can handle the PDU Session and the other UPF can handle the MA PDU Session.

[0174] In step 11, an SMF initiated SM Policy Association Notification may be performed. The SMF may be an H-SMF.

[0175] In step 12a, the H-SMF may send N4 rules for MA PDU Session over two 3GPP access networks to the H-UPF. And in step 12b, the H-SMF may receive a response message from the H-UPF.

[0176] At step 12c, a registration procedure between H-SMF and UDM can be performed.

[0177] And the first downlink data can be transmitted from H-UPF to V-UPF.

[0178] At step 13, an Nsmf_PDUSession_Create Response message can be sent from H-SMF to V-SMF.

[0179] According to one embodiment, in step 13, the H-SMF may transmit the following information to the V-SMF: QoS Rule(s) for MA PDU Request_DualSteer_Multi-USIM, H-CN Tunnel Info, ATSSS Rule. It may also include SM context for VPLMN information. In addition, more information may be included.

[0180] In steps 13a-13b, the V-SMF can provide N4 rules to the UPF. For example, in step 13a, the V-SMF can send an N4 Session Modification Request message to the V-UPF. And in step 13b, the V-UPF can send an N4 Session Modification Response message to the V-SMF.

[0181] In step 14, the V-SMF may send an “MA PDU Session Accepted” Indication to the AMF. The AMF may mark the PDU Session as an MA PDU Session over Multiple PLMNs.

[0182] In step 15, the AMF may send an N2 PDU session request message to (R)AN.

[0183] At step 16, the terminal can perform (R)AN and RRC reconfiguration.

[0184] In step 17, (R)AN may send an N2 PDU Session Request Ack message to AMF.

[0185] Afterwards, the terminal can transmit First Uplink data to H-UPF via V-UPF. Meanwhile, steps 18 to 24 are procedures based on general technology, and thus their specific details are omitted.

[0186] FIG. 9 is a diagram for suggesting several methods for an AMF to select H-AMF and H-SMF in a VPLMN according to one embodiment of the present disclosure.

[0187] Since the terminal can receive the HPLMN Information (HPLMN ID and terminal GPSI of HPLMN) information and the SMF ID through the PDU Session Establishment Accept message from the HPLMN, there may be a method for transmitting the received HPLMN Information and / or SMF ID from the VPLMN to the AMF so that the AMF selects the H-SMF. (3A of FIG. 9)

[0188] Additionally, there may be a way for AMF to utilize V-NRF and H-NRF for selection of H-AMF and H-SMF (Fig. 9, 3B).

[0189] Specifically, in step 1, vAMF may send an Nnrf_NFDiscovery_Request message to vNRF. And in step 2, vNRF may send an Nnrf_NFDiscovery_Request message to hNRF.

[0190] According to one embodiment of the present disclosure, in accordance with the 3A procedure, in step 3a, the vNRF may receive an Nnrf_NFDiscovery_Request response message from the hNRF. And in step 3b, the vNRF may forward the Nnrf_NFDiscovery_Request response message to the vAMF.

[0191] According to another embodiment of the present disclosure, according to procedure 3B, in step 3a, the hNRF may transmit an Nnrf_NFDiscovery_Request message to the local NRF of the HPLMN. And in step 3b, the local NRF of the HPLMN may transmit an Nnrf_NFDiscovery_Request response message to the hNRF. Based on receiving the Nnrf_NFDiscovery_Request response message, the hNRF may transmit an Nnrf_NFDiscovery_Request response message to the vNRF, and the subsequent operations may be the same as in procedure 3A.

[0192] FIG. 10 is a diagram showing the configuration of a terminal according to an embodiment of the present disclosure.

[0193] A terminal according to one embodiment of the present disclosure may include a processor (820) that controls the overall operation of the terminal, a transceiver (1000) including a transmitter and a receiver, and a memory (1010). Of course, the present invention is not limited to the above example, and the terminal may include more or fewer components than those illustrated in FIG. 10.

[0194] According to one embodiment of the present disclosure, the transceiver (1000) can transmit and receive signals with network entities or other terminals. The signals transmitted and received with the network entities may include control information and data. In addition, the transceiver (1000) can receive signals via a wireless channel, output them to the processor (1020), and transmit the signals output from the processor (1020) via the wireless channel.

[0195] According to one embodiment of the present disclosure, the processor (1020) can control the terminal to perform any one of the operations of the above-described embodiments. Meanwhile, the processor (1020), the memory (1010), and the transceiver (1000) do not necessarily have to be implemented as separate modules, and of course, they can be implemented as a single component in the form of a single chip. In addition, the processor (1020) and the transceiver (1000) can be electrically connected. In addition, the processor (1020) can be an Application Processor (AP), a Communication Processor (CP), a circuit, an application-specific circuit, or at least one processor.

[0196] According to one embodiment of the present disclosure, the memory (1010) can store data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the memory (1010) provides the stored data upon request of the processor (1020). The memory (510) may be configured as a storage medium or a combination of storage media such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. In addition, there may be a plurality of memories (810). In addition, the processor (820) can perform the above-described embodiments based on a program for performing the above-described embodiments of the present disclosure stored in the memory (510).

[0197] FIG. 11 is a diagram illustrating a configuration of a base station or network entity according to an embodiment of the present disclosure.

[0198] A network entity according to one embodiment of the present disclosure may include a processor (1120) that controls the overall operation of the network entity, a transceiver (1100) including a transmitter and a receiver, and a memory (1110). Of course, the present invention is not limited to the above example, and the network entity may include more or fewer components than those illustrated in FIG. 11.

[0199] According to one embodiment of the present disclosure, the transceiver (1100) can transmit and receive signals with at least one of other network entities or terminals. The signals transmitted and received with at least one of the other network entities or terminals may include control information and data.

[0200] According to one embodiment of the present disclosure, the processor (1120) can control a network entity to perform any one of the operations described above. Meanwhile, the processor (1120), the memory (1110), and the transceiver (1100) do not necessarily have to be implemented as separate modules, and of course, they can be implemented as a single component in the form of a single chip. In addition, the processor (1120) and the transceiver (1100) can be electrically connected. In addition, the processor (1120) can be an Application Processor (AP), a Communication Processor (CP), a circuit, an application-specific circuit, or at least one processor.

[0201] According to one embodiment of the present disclosure, the memory (1110) may store data such as basic programs, application programs, and setting information for the operation of a network entity. In particular, the memory (1110) provides the stored data upon request of the processor (1120). The memory (910) may be configured as a storage medium or a combination of storage media such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. In addition, there may be a plurality of memories (910). In addition, the processor (1120) may perform the above-described embodiments based on a program for performing the above-described embodiments of the present disclosure stored in the memory (1110).

[0202] It should be noted that the aforementioned configuration diagrams, examples of control / data signal transmission methods, examples of operational procedures, and configuration diagrams are not intended to limit the scope of the present disclosure. That is, not all components, entities, or operational steps described in the embodiments of the present disclosure should be construed as essential components for implementing the disclosure, and implementations may be made within a scope that does not detract from the essence of the disclosure even if only some components are included. Furthermore, each embodiment may be combined and operated as needed. For example, parts of the methods proposed in the present disclosure may be combined to operate network entities and terminals.

[0203] The operations of the base station or terminal described above can be realized by providing a memory device storing the corresponding program code in any component within the base station or terminal device. That is, the control unit of the base station or terminal device can execute the operations described above by reading and executing the program code stored in the memory device using a processor or CPU (Central Processing Unit).

[0204] The various components and modules of the entity, base station or terminal device described in this specification may be operated using hardware circuits, such as logic circuits based on complementary metal oxide semiconductors, firmware, software and / or hardware and firmware and / or software embedded in a machine-readable medium. For example, various electrical structures and methods may be implemented using electrical circuits such as transistors, logic gates and application-specific semiconductors.

[0205] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present disclosure.

[0206] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0207] Additionally, the program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device performing an embodiment of the present disclosure.

[0208] In the specific embodiments of the present disclosure described above, components included in the disclosure are expressed in the singular or plural form, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in the plural form may be composed of singular elements, or components expressed in the singular form may be composed of plural elements.

[0209] Meanwhile, although the detailed description of the present disclosure has described specific embodiments, it is obvious that various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be determined not only by the scope of the following claims but also by equivalents of the scope of the claims. In other words, it will be apparent to those skilled in the art to which the present disclosure pertains that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, each of the above embodiments can be combined and operated with each other as needed. For example, parts of the methods proposed in the present disclosure can be combined with each other to operate a base station and a terminal. In addition, although the above embodiments have been presented based on a 5G, NR system, other modifications based on the technical idea of ​​the above embodiments can be implemented with other systems such as LTE, LTE-A, and LTE-A-Pro systems.

[0210] While the detailed description of this disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the described embodiments, but should be defined not only by the scope of the claims described below, but also by equivalents thereof.

Claims

1. A method performed by an access and mobility management function (AMF) entity associated with a VPLMN (visited public land mobile network) in a wireless communication system, A step of receiving, from a base station that has received a registration request message from a terminal, a first message requesting registration of the terminal for a VPLMN network; To register the terminal, a step of transmitting a second message including registration type information and HPLMN (home PLMN) information to a unified data management (UDM) entity, wherein the registration type information indicates initial registration for dual steer, and the HPLMN information includes at least one of an HPLMN identifier or a terminal identifier of the HPLMN; A step of receiving a third message including subscriber information of the terminal from the UDM; and A method comprising: a step of generating terminal context (UE context) information associated with a VPLMN for the dual steer based on subscriber information of the received terminal; 2. In paragraph 1, A step of identifying an AMF entity associated with the HPLMN based on the above HPLMN information; and A method further comprising: transmitting a fourth message to an AMF entity associated with the identified HPLMN, requesting UE context information associated with the HPLMN for the dual steer.

3. In paragraph 2, A method further comprising: receiving a fifth message including UE context information associated with the HPLMN for the dual steer from an AMF entity associated with the HPLMN; 4. In paragraph 3, The fifth message above is, A method characterized by further including at least one of AM policy information for the HPLMN or UE policy information for the dual steer associated with the HPLMN.

5. In paragraph 1, Step of selecting a policy control function (PCF) entity; and A step of performing AM policy association establishment for the selected PCF entity and the dual steer; further comprising; A method characterized in that a dual steer indicator is transmitted to the above PCF entity for the establishment.

6. In paragraph 1, further comprising a step of transmitting a sixth message accepting registration to the terminal; A method characterized in that the sixth message includes information indicating whether the dual steer is supported.

7. In paragraph 1, The AMF entity associated with the above VPLMN is: A method characterized by supporting initial registration for the dual steer and supporting multi access (MA) protocol data unit (PDU) requests for the dual steer associated with multi universal subscriber identity module (multi USIM).

8. In a wireless communication system, for an access and mobility management function (AMF) entity associated with a VPLMN (visited public land mobile network), Transmitter and receiver; and From a base station that has received a registration request message from a terminal, a first message requesting registration of the terminal for a VPLMN network is received through the transceiver, To register the terminal, a second message is transmitted to a unified data management (UDM) entity, including registration type information and HPLMN (home PLMN) information, wherein the registration type information indicates initial registration for dual steer, and the HPLMN information includes at least one of an HPLMN identifier or a terminal identifier of the HPLMN. Receive a third message including subscriber information of the terminal from the UDM, An AMF entity associated with a VPLMN, comprising: a control unit for controlling generation of terminal context (UE context) information associated with a VPLMN for the dual steer based on subscriber information of the received terminal; 9. In paragraph 8, The above control unit, Based on the above HPLMN information, identify the AMF entity associated with the HPLMN, An AMF entity associated with a VPLMN, characterized in that it controls to transmit, through the transceiver, a fourth message requesting UE context information associated with the HPLMN for the dual steer, to the AMF entity associated with the above-mentioned verified HPLMN.

10. In paragraph 9, The above control unit, An AMF entity associated with a VPLMN, characterized in that it controls to receive a fifth message including UE context information associated with the HPLMN for the dual steer from an AMF entity associated with the HPLMN.

11. In paragraph 10, The fifth message above is, An AMF entity associated with a VPLMN, characterized in that it further comprises at least one of AM policy information for said HPLMN or UE policy information for said dual steer associated with said HPLMN.

12. In paragraph 8, The above control unit, Select a policy control function (PCF) entity, Controls the AM policy association establishment for the above-mentioned selected PCF entity and the above-mentioned dual steer, An AMF entity associated with a VPLMN, characterized in that a dual steer indicator is transmitted to the PCF entity for the establishment.

13. In paragraph 8, The above control unit, Control to transmit a 6th message accepting registration to the above terminal through the above transceiver, An AMF entity associated with a VPLMN, characterized in that the sixth message includes information indicating whether the dual steer is supported.

14. In paragraph 8, The AMF entity associated with the above VPLMN is: An AMF entity associated with a VPLMN, characterized by supporting initial registration for said dual steer and supporting multi access (MA) protocol data unit (PDU) requests for said dual steer associated with multi universal subscriber identity module (multi USIM).

Images