KR20230139522A - Method and apparatus for supporting multi-modality communication in wireless communication system - Google Patents

Abstract

According to various embodiments of the present disclosure, in a wireless communication system, a method performed by a session management function (SMF) includes the steps of: receiving a PDU session creation request message for a first terminal or a second terminal from an access and mobility management function (AMF); sending a session policy association establishment request message to a PCF; receiving multi-modality service information from the PCF; identifying whether the first terminal and the second terminal are connected to the same RAN; and if connected to a common RAN, transmitting QoS information or scheduling information to the common RAN or UPF. It is possible to provide smooth efficiency of service in a wireless communication system.

Description

Method and apparatus for supporting multi-modality communication in a wireless communication system {METHOD AND APPARATUS FOR SUPPORTING MULTI-MODALITY COMMUNICATION IN WIRELESS COMMUNICATION SYSTEM}

This disclosure relates to a method and device for supporting multi-modality communication services in a wireless communication system.

Specifically, the present disclosure relates to a method and apparatus for selecting the same base station while a plurality of terminals receive a multi-modality communication service in a wireless communication system.

5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and includes sub-6 GHz ('Sub 6GHz') bands such as 3.5 gigahertz (3.5 GHz) as well as millimeter wave (mm) bands such as 28 GHz and 39 GHz. It is also possible to implement it in the ultra-high frequency band ('Above 6GHz') called Wave. In addition, in the case of 6G mobile communication technology, which is called the system of Beyond 5G, Terra is working to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low delay time that is reduced to one-tenth. Implementation in Terahertz bands (e.g., 95 GHz to 3 THz) is being considered.

In the early days of 5G mobile communication technology, there were concerns about ultra-wideband services (enhanced Mobile BroadBand, eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communications (mMTC). With the goal of satisfying service support and performance requirements, efficient use of ultra-high frequency resources, including beamforming and massive array multiple input/output (Massive MIMO) to alleviate radio wave path loss in ultra-high frequency bands and increase radio transmission distance. Various numerology support (multiple subcarrier interval operation, etc.) and dynamic operation of slot format, initial access technology to support multi-beam transmission and broadband, definition and operation of BWP (Band-Width Part), large capacity New channel coding methods such as LDPC (Low Density Parity Check) codes for data transmission and Polar Code for highly reliable transmission of control information, L2 pre-processing, and dedicated services specialized for specific services. Standardization of network slicing, etc., which provides networks, has been carried out.

Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology, considering the services that 5G mobile communication technology was intended to support, based on the vehicle's own location and status information. V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience, and NR-U (New Radio Unlicensed), which aims to operate a system that meets 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 the terrestrial network is impossible, positioning, etc. Physical layer standardization for technology is in progress.

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

When this 5G mobile communication system is commercialized, an explosive increase in connected devices will be connected to the communication network. Accordingly, it is expected that strengthening the functions and performance of the 5G mobile communication system and integrated operation of connected devices will be necessary. To this end, eXtended Reality (XR) and Artificial Intelligence are designed to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR). , AI) and machine learning (ML), new research will be conducted on 5G performance improvement and complexity reduction, AI service support, metaverse service support, and drone communication.

In addition, the development of these 5G mobile communication systems includes new waveforms, full dimensional MIMO (FD-MIMO), and array antennas to ensure coverage in the terahertz band of 6G mobile communication technology. , multi-antenna transmission technology such as Large Scale Antenna, metamaterial-based lens and antenna to improve coverage of terahertz band signals, high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum), RIS ( In addition to Reconfigurable Intelligent Surface technology, Full Duplex technology, satellite, and AI (Artificial Intelligence) to improve the frequency efficiency of 6G mobile communication technology and system network are utilized from the design stage and end-to-end. -to-End) Development of AI-based communication technology that realizes system optimization by internalizing AI support functions, and next-generation distributed computing technology that realizes services of complexity beyond the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could be the basis for .

As described above, with the development of wireless communication systems, the time it takes for XR data to provide XR (eXtended reality) services to users is delivered to each XR device through the 5G system is controlled within an acceptable delay time. Therefore, a service that can improve the user experience of the XR service, that is, a method to provide the network with QoS (quality of service) and policy for transmitting XR data(s) to enable multi-modality service. This is required.

Based on the above-described discussion, the present disclosure seeks to provide a method and device that can provide smooth service efficiency in a wireless communication system.

In addition, the present disclosure provides a method and apparatus for selecting the same base station (or radio access network (RAN) node) in a wireless communication system when a user receives a multi-modality communication service through one or more terminals. to provide.

According to various embodiments of the present disclosure, in a wireless communication system, a method performed by a session management function (SMF) includes receiving a PDU session creation request message or a second request message for a first terminal from an access and mobility management function (AMF). Receiving at least one of the PDU session creation request messages for the terminal, transmitting at least one session policy association establishment request message based on the PCF (policy function) PDU session creation request message, and transmitting at least one session policy association establishment request message from the PCF to the multi-modality service. Receiving at least one message containing information about, identifying whether a radio access network (RAN) connected to the first terminal and a RAN connected to the second terminal are the same, and connecting the first terminal and the When the second terminal is connected to the common RAN, transmitting at least one of quality of service (QoS) information or scheduling information related to the first terminal and the second terminal to at least one of the common RAN or the user plane function (UPF). It may include, and at least one of the QoS information or scheduling information may be used to control the difference in delay time occurring between the first terminal and the second terminal.

According to various embodiments of the present disclosure, in a wireless communication system, a method performed by an access mobility and management function (AMF) is a method in which a first terminal and a second terminal have a common radio access (RAN) from a session management function (SMF). receiving a multi-modality preparation request message indicating that the RAN should be connected to the first terminal; identifying whether the RAN connected to the first terminal and the RAN connected to the second terminal are the same; based on the identification, the first 2. Transmitting an N2 request message containing information about the RAN connected to the first terminal to the RAN connected to the terminal, and receiving from the RAN connected to the first terminal that the second terminal is connected to the RAN connected to the first terminal. It may include receiving an N2 path change request message notifying that the first terminal and the second terminal are connected to a common RAN, and transmitting a multi-modality ready ACK (acknowledge) message to the SMF.

According to various embodiments of the present disclosure, in a wireless communication system, a session management function (SMF) device includes at least one transceiver and at least one processor functionally coupled to the at least one transceiver. It includes, wherein the at least one processor receives at least one of a PDU session creation request message for the first terminal or a PDU session creation request message for the second terminal from an access and mobility management function (AMF), and a PCF ( policy function) Transmit at least one session policy association establishment request message based on the PDU session creation request message, receive at least one message containing information about the multi-modality service from the PCF, and connect to the first terminal. Identify whether a radio access network (RAN) and a RAN connected to the second terminal are the same, and when the first terminal and the second terminal are connected to a common RAN, QoS (QoS) related to the first terminal and the second terminal It may be configured to transmit at least one of quality of service) information or scheduling information to at least one of a common RAN or a user plane function (UPF), and at least one of the QoS information or scheduling information is transmitted to the first terminal and the second terminal. It can be used to control the difference in delay time that occurs in the terminal.

According to various embodiments of the present disclosure, in a wireless communication system, an access mobility and management function (AMF) device includes at least one transceiver; and at least one processor functionally coupled to the at least one transceiver, wherein the at least one processor is configured to enable the first terminal and the second terminal to use a common radio access network (RAN) from a session management function (SMF). ) Receive a multi-modality preparation request message indicating that it should be connected to, identify whether the RAN connected to the first terminal and the RAN connected to the second terminal are the same, and based on the identification, connect to the second terminal. An N2 path that transmits an N2 request message containing information about the RAN connected to the first terminal to the connected RAN, and informs the RAN connected to the first terminal that the second terminal is connected to the RAN connected to the first terminal. It may be configured to receive a change request message, and to transmit a multi-modality ready ACK (acknowledge) message notifying the SMF that the first terminal and the second terminal are connected to a common RAN.

Various embodiments of the present disclosure can provide devices and methods that can effectively provide services in a wireless communication system.

The effects that can be obtained from the present disclosure are not limited to the effects mentioned in the various embodiments, and other effects not mentioned will be clearly understood by those skilled in the art from the description below. It could be.

1 illustrates a communication network including core network entities in a wireless communication system according to various embodiments of the present disclosure.
FIG. 2A illustrates a wireless environment including a core network in a wireless communication system according to various embodiments of the present disclosure.
FIG. 2B illustrates the configuration of a core network object in a wireless communication system according to various embodiments of the present disclosure.
FIG. 2C shows the configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
FIG. 3 illustrates an example of a multi-modality communication service data transmission path in a wireless communication system according to various embodiments of the present disclosure.
FIG. 4 illustrates a signal flow for transmitting multi-modality communication service data in a wireless communication system according to various embodiments of the present disclosure.
FIG. 5 illustrates a PDU session establishment procedure and signal flow for performing multi-modality communication in a wireless communication system according to various embodiments of the present disclosure.
FIG. 6 illustrates a signal flow for performing handover and multi-modality communication of a terminal in a wireless communication system according to various embodiments of the present disclosure.
FIG. 7 illustrates another signal flow for performing handover and multi-modality communication of a terminal in a wireless communication system according to various embodiments of the present disclosure.

Terms used in the present disclosure are merely used to describe specific embodiments and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions, unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as generally understood by a person of ordinary skill in the technical field described in this disclosure. Among the terms used in this disclosure, terms defined in general dictionaries may be interpreted to have the same or similar meaning as the meaning they have in the context of related technology, and unless clearly defined in this disclosure, have an ideal or excessively formal meaning. It is not interpreted as In some cases, even terms defined in the present disclosure cannot be interpreted to exclude embodiments of the present disclosure.

In various embodiments of the present disclosure described below, a hardware approach method is explained as an example. However, since various embodiments of the present disclosure include technology using both hardware and software, the various embodiments of the present disclosure do not exclude software-based approaches.

Hereinafter, the operating principle of the present disclosure will be described in detail with reference to the attached drawings. In explaining the present disclosure, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of the functions in the present disclosure, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

For the same reason, some components are omitted or schematically shown in the accompanying drawings. Additionally, the size of each component does not entirely reflect its actual size. In each drawing, identical or corresponding components are assigned the same reference numbers.

The advantages and features of the present disclosure and methods for achieving them will become clear by referring to the embodiments described in detail below along 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 present embodiments are merely provided to ensure that the present disclosure is complete and to those skilled in the art to which the present disclosure pertains. It is provided to fully inform the person of the scope of the present disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

At this time, it will be understood that each block of the processing flow diagram diagrams and combinations of the flow diagram diagrams can be performed by computer program instructions. Computer program instructions may be mounted on a processor of a general-purpose computer, special-purpose computer, or other programmable data processing device, so that the instructions performed through the processor of a computer or other programmable data processing device may perform the functions described in the flowchart block(s). You can create the means to carry them out. Computer program instructions may also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that The stored instructions may also produce manufactured items containing instruction means that perform the functions described in the flow diagram block(s). Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a process that is executed by the computer, thereby generating a process that is executed by the computer or other programmable data processing equipment. Instructions that perform processing equipment may also provide steps for executing the functions described in the flow diagram block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). In some alternative implementations, it is possible for the functions mentioned in the blocks to occur out of order. For example, it is possible for two blocks shown in succession to be performed substantially at the same time, or it is possible for the blocks to be performed in reverse order depending on the corresponding function.

The term '~unit' used in this embodiment means a software or hardware component, and the '~unit' performs certain roles. However, '~part' is not limited to software or hardware. The '~ part' may be configured to reside in an addressable storage medium and may be configured to reproduce on one or more processors. Therefore, as an example, '~ part' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and 'parts' may be combined into a smaller number of components and 'parts' or may be further separated into additional components and 'parts'. Additionally, components and 'parts' may be implemented to regenerate one or more CPUs within a device or a secure multimedia card. Also, in an embodiment, '~ part' may include one or more processors.

In the present disclosure, a terminal (User Equipment, UE) may be referred to as a terminal, MS (Mobile Station), cellular phone, smartphone, computer, or various electronic devices capable of performing communication functions.

Embodiments of the present disclosure can be applied to other communication systems having a similar technical background or channel type as the embodiments of the present disclosure described below. Additionally, 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 with skilled technical knowledge.

In specifically describing embodiments of the present disclosure, the communication system may use various wired or wireless communication systems. For example, 3GPP, a wireless communication standard standardization organization, uses New RAN (NR), a wireless access network based on 5G communication standards. You can use the packet core (5G System, or 5G Core Network, or NG Core (Next Generation Core)), which is a core network. In addition, it can be applied to other communication systems with similar technical background with slight modifications without significantly departing from the scope of the present disclosure, which can be done at the judgment of a person skilled in the technical field of the present disclosure. .

Hereinafter, terms used in the description of the present disclosure include terms for identifying a connection node, terms referring to network entities (i.e., network functions), terms referring to messages, and interfaces between NFs (Network Functions). Terms referring to , terms referring to various identification information, etc. are exemplified for convenience of explanation. Accordingly, the present disclosure is not limited to the terms described later, and other terms referring to objects having equivalent technical meaning may be used.

In addition, the present disclosure describes various embodiments using terms used in some communication standards (eg, ^3rd Generation Partnership Project (3GPP)), but this is only an example for explanation. Various embodiments of the present disclosure can be easily modified and applied to other communication systems.

The 5G system supports network slices, and traffic for different network slices can be handled by different protocol data unit (PDU) sessions. A PDU session may mean an association between a terminal and a data network that provides a PDU connection service. A network slice logically configures the network as a set of network functions (NF) to support various services with different characteristics such as broadband communication services, massive IoT, and mission-critical services such as V2X. and can be understood as a technology to separate different network slices. Therefore, even if a communication failure occurs in a certain network slice, communication in other network slices is not affected, making it possible to provide a stable communication service. In this disclosure, “slice” may be used interchangeably to mean “network slice.” In a network environment, a terminal can access multiple network slices to receive various services. A network function (NF) can be implemented as a network element as a software instance running on hardware, or as a virtualized function instantiated on an appropriate platform.

A mobile communication service provider can configure the network slices and allocate network resources suitable for a specific service for each network slice or set of network slices. Network resources may mean NF, logical resources provided by NF, or radio resource allocation of a base station.

For example, a mobile communication service provider configures network slice A to provide mobile broadband services, configures network slice B to provide vehicle-to-everything (V2X) services, and provides XR services, which will be described later. You can configure network slice C. In a 5G network, the service can be efficiently provided to terminals through a network slice specialized for the characteristics of each service. In the 5G system, network slices can be expressed as S-NSSAI (Single-Network Slice Selection Assistance Information). S-NSSAI may include SST (Slice/Service Type) value and SD (Slice Differentiator) value. SST may indicate the characteristics of the service supported by the network slice (e.g., enhanced mobile broadband (eMBB), IoT, ultra reliability low latency communication (URLLC), V2X, XR service, etc.). SD may be a value used as an additional identifier for a specific service referred to as SST.

Services that require high data rate low latency (HDRLL) are extended reality (XR) services, augmented reality (AR) services, and virtual reality (Virtual Reality) services. , VR) service, or cloud gaming service. A VR service may be a service that provides a virtual environment implemented on a computer device using a VR headset, etc. An AR service may be a service that can combine a virtual environment with the real world using location, geographic information, etc. XR service can be a service that can not only combine the real environment and the virtual environment, but also provide the user with information such as touch, hearing, and smell to enhance the user's experience.

In the case of XR/AR/VR services, multiple devices can be used to provide the service. For example, when a network serves audio, video, and haptics to a user, a device serves audio, a device serves video, and a device serves haptics that implements the feeling of touch by applying vibration, motion, etc. may be different. At this time, XR/AR/VR service with high user experience can be provided only when XR/AR/VR data arriving at each device through the network is delivered to the user within a time appropriate for the service. According to various embodiments of the present disclosure, when providing XR/AR/VR services (hereinafter collectively referred to as XR services for convenience in the embodiments of the present disclosure), different types of XR data are provided to the user within a delay time suitable for the XR service. The service for delivery may be called a multi-modality communication service. In this disclosure, the term multi-modality communication service is used for convenience of explanation, and various service names indicating delivery of a plurality of XR data to the user within a delay time appropriate for the XR service may be used.

In explaining the multi-modality communication service in the present disclosure, the embodiments of the present disclosure are described based on the XR service for convenience. However, in the case of various data services that require not only the XR service but also multiple devices to provide services to one user in harmony, It can also be applied. Therefore, it should be noted that embodiments of the present disclosure are not limited to XR services.

As above, the XR device(s) for the XR service are communication terminals that can provide services by directly connecting to the 5G network depending on the service scenario. Alternatively, each XR device may be connected to one terminal (for example, using a method such as tethering) and provide services by accessing a 5G network.

According to various embodiments of the present disclosure, when various types of XR service data such as audio, video, or haptic are transmitted to multiple terminals used by the same user, each XR service data is transmitted to the terminals at a similar time to allowable The user's service experience can be improved by being delivered to the user within the delay time.

Additionally, according to various embodiments of the present disclosure, scheduling in consideration of delay time may be performed in the process of delivering various types of XR data to a plurality of terminals for use of the same XR service. Various embodiments of the present invention can smoothly provide multi-modality communication services by allowing the same RAN node to be selected during the scheduling process.

1 illustrates a communication network including core network entities in a wireless communication system according to various embodiments of the present disclosure. The 5G mobile communication network may include a 5G user equipment (UE) 110, a 5G radio access network (RAN) 120, and a 5G core network.

The 5G core network includes an access and mobility management function (AMF) 150 that provides UE mobility management function, a session management function (SMF) 160 that provides a session management function, and a user plane (UPF) that performs a data transmission role. function) (170), PCF (policy control function) (180) that provides policy control functions, UDM (unified data management) (153) that provides data management functions such as subscriber data and policy control data, or various network functions (network) It can be configured to include network functions such as UDR (unified data repository) that stores data of various functions.

Referring to FIG. 1, a user equipment (UE) 110 may communicate through a wireless channel formed with a base station (e.g., eNB, gNB), that is, an access network. In some embodiments, the terminal 110 is a device used by a user and may be a device configured to provide a user interface (UI). As an example, the UE 110 may be a terminal mounted on a vehicle for driving. In some other embodiments, the terminal 110 may be a device that performs machine type communication (MTC) that operates without user involvement, or may be an autonomous vehicle. In addition to electronic devices, UE includes 'terminal', 'vehicle terminal', 'user equipment (UE)', 'mobile station', 'subscriber station', ' It may be referred to as a 'remote terminal', 'wireless terminal', or 'user device' or other terms having equivalent technical meaning. As a terminal, in addition to the UE, customer-premises equipment (CPE) or a dongle type terminal may be used. Customer premises devices, like UEs, can be connected to NG-RAN nodes while providing the network to other communication devices (e.g. laptops).

Referring to FIG. 1, the AMF 150 provides functions for access and mobility management on a per terminal 110 basis, and each terminal 110 can be basically connected to one AMF 150. Specifically, the AMF 150 provides signaling between core network nodes for mobility between 3GPP access networks, an interface (N2 interface) between radio access networks (e.g., 5G RAN) 120, and NAS signaling with the terminal 110. , identification of the SMF 160, and provision of delivery of a session management (SM) message between the terminal 110 and the SMF 160. Some or all of the functions of AMF 150 may be supported within a single instance of AMF 150.

Referring to FIG. 1, the SMF 160 provides a session management function, and when the terminal 110 has multiple sessions, each session can be managed by a different SMF 160. Specifically, SMF 160 is responsible for session management (e.g., establishing, modifying, and tearing down sessions, including maintaining tunnels between UPF 170 and access network nodes), selecting and controlling user plane (UP) functions. , Traffic steering settings to route traffic to the appropriate destination in the UPF 170, termination of the SM portion of the NAS message, downlink data notification (DDN), AN initiator of specific SM information ( For example, at least one of the following functions may be performed: delivery to the access network through the N2 interface via the AMF 150). Some or all of the functions of the SMF 160 may be supported within a single instance of the SMF 160.

In the 3GPP system, conceptual links connecting NFs in the 5G system may be referred to as reference points. A reference point may also be referred to as an interface. The following illustrates reference points included in the 5G system architecture represented across FIGS. 1 to 7.

- N1: Reference point between UE (110) and AMF (150)

- N2: Reference point between (R)AN (120) and AMF (150)

- N3: Reference point between (R)AN (120) and UPF (170)

- N4: Reference point between SMF (160) and UPF (170)

- N5: Reference point between PCF (180) and AF (130)

- N6: Reference point between UPF (170) and DN (140)

- N7: Reference point between SMF (160) and PCF (180)

- N8: Reference point between UDM (153) and AMF (150)

- N9: Reference point between two core UPFs (170)

- N10: Reference point between UDM (153) and SMF (160)

- N11: Reference point between AMF (150) and SMF (160)

- N12: Reference point between AMF (150) and authentication server function (AUSF) (151)

- N13: Reference point between UDM (153) and authentication server function (151)

- N14: Reference point between two AMF (150)

- N15: Reference point between PCF (180) and AMF (150) for non-roaming scenarios, reference point between PCF (180) and AMF (150) in visited network for roaming scenarios.

FIG. 2A illustrates a wireless environment including a core network 200 in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 2A, the wireless communication system includes a radio access network (RAN) 120 and a core network (CN) 200.

The wireless access network 120 is a network directly connected to a user device, for example, the terminal 110, and is an infrastructure that provides wireless access to the terminal 110. The wireless access network 120 includes a set of a plurality of base stations including a base station 125, and the plurality of base stations can communicate through interfaces formed between them. At least some of the interfaces between the plurality of base stations may be wired or wireless. The base station 125 may have a structure divided into a central unit (CU) and a distributed unit (DU). In this case, one CU can control multiple DUs. In addition to the base station, the base station 125 includes 'access point (AP)', 'gNB (next generation node B)', '5G node (5 ^th generation node)', and 'wireless point'. ', 'transmission/reception point (TRP)', or other terms with equivalent technical meaning. The terminal 110 connects to the wireless access network 120 and communicates with the base station 125 through a wireless channel. In addition to the terminal, the terminal 110 includes 'user equipment (UE)', 'mobile station', 'subscriber station', 'remote terminal', and 'wireless terminal'. It may be referred to as ‘wireless terminal’, ‘user device’, or other terms with equivalent technical meaning.

The core network 200 is a network that manages the entire system, controls the wireless access network 120, and processes data and control signals for the terminal 110 transmitted and received through the wireless access network 120. The core network 200 controls user plane and control plane, processes mobility, manages subscriber information, charges, and other types of systems (e.g., long term evolution (LTE) system). ) performs various functions, such as linking with In order to perform the various functions described above, the core network 200 may include a number of functionally separated entities with different network functions (NFs). For example, the core network 200 includes an access and mobility management function (AMF) 150, a session management function (SMF) 160, a user plane function (UPF) 170, and a policy and charging function (PCF) ( 180), network repository function (NRF) 159, user data management (UDM) 153, network exposure function (NEF) 155, and unified data repository (UDR) 157.

The terminal 110 is connected to the wireless access network 120 and accesses the AMF 150, which performs the mobility management function of the core network 200. The AMF 150 is a function or device that is responsible for both access to the wireless access network 120 and mobility management of the terminal 110. SMF 160 is an NF that manages sessions. AMF 150 is connected to SMF 160, and AMF 150 routes session-related messages for terminal 110 to SMF 160. The SMF 160 connects to the UPF 170, allocates user plane resources to be provided to the terminal 110, and establishes a tunnel to transmit data between the base station 125 and the UPF 170. The PCF 180 controls information related to policy and charging for sessions used by the terminal 110. The NRF (159) stores information about NFs installed in the mobile communication service provider network and performs the function of informing of the stored information. NRF 159 can be connected to all NFs. When each NF starts operating in the operator network, it registers with the NRF 159 to notify the NRF 159 that the corresponding NF is operating within the network. The UDM 153 is an NF that performs a similar role to the home subscriber server (HSS) of a 4G network, and stores the subscription information of the terminal 110 or the context that the terminal 110 uses within the network.

The NEF (155) serves to connect the ^3rd party server and the NF within the 5G mobile communication system. It also performs a role of providing data to the UDR 157, updating, or obtaining data. The UDR (157) has the function of storing subscription information of the terminal 120, storing policy information, storing data exposed to the outside, or storing information necessary for a ^3rd party application. Perform. Additionally, the UDR 157 also serves to provide stored data to other NFs.

FIG. 2B illustrates the configuration of a core network object in a wireless communication system according to various embodiments of the present disclosure. Configuration 200 illustrated in FIG. 2B has at least one function of (150), (153), (155), (157), (160), (170), (180), and (190) of FIG. Branches can be understood as the configuration of a device. Hereinafter used ‘…’ wealth', '… Terms such as 'unit' refer to a unit that processes at least one function or operation, and may be implemented as hardware, software, or a combination of hardware and software.

Referring to FIG. 2B, the core network object includes a communication unit 210, a storage unit 230, and a control unit 220.

The communication unit 210 provides an interface for communicating with other devices in the network. That is, the communication unit 210 converts a bit string transmitted from a core network object to another device into a physical signal, and converts a physical signal received from another device into a bit string. That is, the communication unit 210 can transmit and receive signals. Accordingly, the communication unit 210 may be referred to as a modem, a transmitter, a receiver, or a transceiver. At this time, the communication unit 210 allows the core network object to communicate with other devices or systems through a backhaul connection (eg, wired backhaul or wireless backhaul) or a network.

The storage unit 230 stores data such as basic programs, applications, and setting information for the operation of core network objects. The storage unit 230 may be comprised of volatile memory, non-volatile memory, or a combination of volatile memory and non-volatile memory. And, the storage unit 230 provides stored data according to the request of the control unit 220.

The control unit 220 controls overall operations of core network objects. For example, the control unit 220 transmits and receives signals through the communication unit 210. Additionally, the control unit 220 records and reads data from the storage unit 230. For this purpose, the control unit 220 may include at least one processor. According to various embodiments of the present disclosure, the control unit 220 may control to perform synchronization using a wireless communication network. For example, the control unit 220 may control the core network object to perform operations according to various embodiments described later.

FIG. 2C shows the configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2C can be understood as the configuration of the terminal 110. Hereinafter used ‘…’ wealth', '… Terms such as 'unit' refer to a unit that processes at least one function or operation, and may be implemented as hardware, software, or a combination of hardware and software.

Referring to FIG. 2C, the terminal includes a communication unit 240, a storage unit 250, and a control unit 260.

The communication unit 240 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 240 performs a conversion function between a baseband signal and a bit string according to the physical layer standard of the system. For example, when transmitting data, the communication unit 240 generates complex symbols by encoding and modulating the transmission bit string. Additionally, when receiving data, the communication unit 240 restores the received bit stream by demodulating and decoding the baseband signal. Additionally, the communication unit 240 upconverts the baseband signal into an RF band signal and transmits it through an antenna, and downconverts the RF band signal received through the antenna into a baseband signal. For example, the communication unit 240 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc.

Additionally, the communication unit 240 may include multiple transmission and reception paths. Furthermore, the communication unit 240 may include at least one antenna array composed of multiple antenna elements. In terms of hardware, the communication unit 240 may be composed of digital circuits and analog circuits (eg, radio frequency integrated circuit (RFIC)). Here, the digital circuit and analog circuit can be implemented in one package. Additionally, the communication unit 240 may include multiple RF chains. Furthermore, the communication unit 240 may perform beamforming.

The communication unit 240 transmits and receives signals as described above. Accordingly, all or part of the communication unit 240 may be referred to as a 'transmitting unit', a 'receiving unit', or a 'transmitting/receiving unit'. Additionally, in the following description, transmission and reception performed through a wireless channel are used to mean that the processing as described above is performed by the communication unit 240.

The storage unit 250 stores data such as basic programs, applications, and setting information for operation of the terminal. The storage unit 250 may be comprised of volatile memory, non-volatile memory, or a combination of volatile memory and non-volatile memory. And, the storage unit 250 provides stored data according to the request of the control unit 260.

The control unit 260 controls the overall operations of the terminal. For example, the control unit 260 transmits and receives signals through the communication unit 240. Additionally, the control unit 260 records and reads data from the storage unit 250. Additionally, the control unit 260 can perform protocol stack functions required by communication standards. To this end, the control unit 260 may include at least one processor or microprocessor, or may be part of a processor. Additionally, a portion of the communication unit 240 and the control unit 260 may be referred to as a communication processor (CP). According to various embodiments, the control unit 260 may control synchronization using a wireless communication network. For example, the control unit 260 may control the terminal to perform operations according to various embodiments described later.

In this disclosure, network technology may refer to standards defined by the International Telecommunication Union (ITU) or 3GPP (eg, TS 23.501, TS 23.502, TS 23.503, etc.). Components included in the network structure of FIG. 3 may each mean a physical entity, software that performs an individual function, or hardware combined with software. In various embodiments of the present disclosure, reference symbols shown as Nx, such as N1, N2, N3,..., may refer to known interfaces between NFs in a 5G core network (CN). For explanations related to the 5G core network, please refer to the standard specification (TS 23.501). For explanations related to the handover procedure, please refer to the standard specification (TS 23.502).

FIG. 3 illustrates an example of a multi-modality communication service data transmission path in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 3, from an application function (AF) 130 (or an application server (AS)) to one user via one or a plurality of UPFs and one next generation-radio access network (NG-RAN) node. Transmission paths through which XR data according to the XR service is delivered to a number of terminals (UEs) 110-1, 110-2, and 110-3 used by (user 1) are shown. Multiple terminals 110-1, 110-2, and 110-3 may operate as XR devices that receive different types of XR data, such as audio data, video data, and haptic data.

Referring to FIG. 3, the wireless communication system may include an NG-RAN (125) and a 5G core network (5GC) (200). NG-RAN can be a base station (e.g., gNB, Integrated Access and Backhaul (IAB), etc.) that supports wireless access technology in the 5G system. NG-RAN can provide XR service-related information and/or data delivered from the AF/AS of the external network via the core network (i.e. 5GC) to terminals including XR devices. NG-RAN can provide XR service-related information and/or data received from terminals to AF/AS. Hereinafter, in the embodiments of the present disclosure, the terminal is connected wirelessly or wired to a plurality of XR devices, or the terminal(s) each includes a plurality of XR devices to establish a 5G system between the XR device and the AS/AF 130. It can be understood as a terminal that performs mediated communication.

Referring to FIG. 3, 5GC may include network entities such as AMF 150, SMF 160, PCF 180, etc.

AMF (150) may be an entity for managing access and mobility of the terminal. AMF can serve as an endpoint of the UE-core network where the UE 110 connects to other entities of 5GC through the NG-RAN 125. AMF 150 may perform at least one of network functions such as registration, connection, reachability, mobility management, access confirmation, authentication, or mobility event generation of the terminal 110. there is.

The SMF 160 may perform a management function for a protocol data unit (PDU) session of the terminal 110. The SMF (160) has a session management function through establishing, modifying, and releasing a session and maintaining the necessary tunnel between the UPF (170) and the NG-RAN (125), a terminal IP (internet protocol) address allocation and management function, and a user plane. At least one of network functions such as (user plane) selection and control, traffic processing control in the UPF 170, or billing data collection control may be performed.

The UPF 170 may be responsible for processing user data (eg, XR data) of the terminal 110. The UPF (170) plays a role in processing XR data so that the XR data generated by the terminal 110 can be delivered to the AF/AS (130) or the data received from the AF/AS (130) can be delivered to the terminal. You can. UPF 170 performs the role of anchor between radio access technologies (RAT), provides connection between PDU sessions and AF/AS 130, packet routing and forwarding, packet inspection, and user plane policy. May perform at least one of the following network functions: enforcement, generating traffic usage reports, or buffering.

The UDM (153) performs functions such as generating authentication information for 3GPP security, processing user identifiers (user ID), managing a list of network functions (network entities) supporting the terminal, and managing subscription information. You can. The UDR 153 may perform at least one of the functions of storing and providing subscription information managed by the UDM, structured data for exposure, a network exposure function (NEF) 155, or application data associated with a service.

The PCF 180 may be a network entity that manages operator policy information for providing services in the 5G system. The UDR 157 stores subscription information of the terminal and may provide the subscription information to the UDM 153. Additionally, the UDR (157) can store operator policy information and provide operator policy information to the PCF (180). The NEF 155 can perform the function of externally transmitting or receiving events occurring in the 5G system and supporting capabilities. According to one embodiment, the NEF (155) has the function of safely supplying information of the AF/AS (130) to 5GC, converting internal/external information, or storing and re-reading information received from other network entities in the UDR (157). Can perform at least one of the functions being deployed.

The terminal 110 can access the NG-RAN 125 and register in the 5G network system. According to one embodiment, the terminal 110 may access the NG-RAN 125 and perform a terminal registration procedure with the AMF 150. During the terminal registration procedure, the AMF 150 may determine a network slice available to the terminal 110 connected to the NG-RAN 125 and allocate it to the terminal 110. The terminal 110 can select a network slice to set up a PDU session for communication with the AF/AS 130. One PDU session may include at least one quality of service (QoS) Flow. Each QoS Flow can provide different transmission performance required for each application service by setting different QoS parameters.

Referring to FIG. 3, XR data received by each XR device in a wireless communication system must be delivered to each XR device within an acceptable delay time to provide XR service, so XR data is transmitted from the AF/AS 130 to the terminal (e.g. : The time required for delivery to a terminal including an XR device or a terminal connected to an XR device (110-1, 110-2, 110-3) must be within an acceptable range. For example, when the user 320 of the XR device touches an object in the virtual space, information about sound, touch, and image that can be received is delivered to the terminal 110 within an acceptable delay time, and the information is sent again. Multi-modality services according to embodiments of the present disclosure are possible only when they can be delivered to an XR device (e.g., an XR device connected to the terminal 110 wirelessly/wired or included in the terminal 110).

To this end, in embodiments of the present disclosure, the time required for XR data(s) to provide XR services to users to be delivered to each XR device through the 5G system is controlled within an allowable delay time, Specific methods for providing QoS and policies for transmitting XR data(s) are described to enable services that can improve user experience (e.g., multi-modality services).

In addition, the embodiments of the present disclosure have been described from the perspective of the downlink in which a plurality of terminals receive XR data, but are not limited thereto and the methods proposed in this disclosure are the same/similar methods in the uplink in which a plurality of terminals transmit XR data. can be applied.

For convenience of explanation below, this disclosure uses terms and names defined in the 5GS (5G system) and NR (new radio) standards, which are the most recent standards defined by the 3GPP organization among currently existing communication standards. However, the present disclosure is not limited by the above terms and names, and can be equally applied to wireless communication networks complying with other standards. In particular, the present disclosure can be applied to 3GPP 5th generation mobile communication standards (eg, 5GS and NR).

FIG. 4 illustrates a signal flow for transmitting multi-modality communication service data in a wireless communication system according to various embodiments of the present disclosure. Referring to FIG. 4, a plurality of XR data for the same XR service is transmitted from the AF/AS 130 to a plurality of terminals 110-1, 110-2, and 110-3 of the same user 320 within an allowable delay time. ) The procedure delivered to ) is shown. Specifically, referring to FIG. 4 , an example of using the XR service through UE1 and UE2, which are terminals (UEs) 110-1, 110-2, and 110-3 of the same user 320, is shown. In the example of FIG. 4, UE1 and UE2 may each be a terminal including an XR device or a terminal connected to an XR device.

Referring to FIG. 4, referring to step 0, basic settings for use of the XR service may be performed between UE1 (110-1) and UE2 (110-2) and the 5G system network. XR-dedicated S-NSSAI, which is an identifier of a dedicated network slice for the XR service, may be set in at least one of the terminal or the network. XR-dedicated S-NSSAI may include an SST (slice/service type) for the XR service, or may include an SST for the XR service provided by a telecommunication operator. XR-dedicated S-NSSAI may also include a slice differentiator (SD) to distinguish a specific XR service or a specific XR service application. According to various embodiments of the present disclosure, without being limited to the above-described example, XR-dedicated S-NSSAI may include a standard SST.

According to one embodiment, the subscription information of the terminal (e.g., UE1, UE2) (110-1, 110-2) set in step 0 may be provided to the terminal (110-1, 110-2) through the network. To the AF/AS ID or Application ID, which is the ID of the AF/AS (130) providing the XR service to be provided by the information terminals (110-1, 110-2) for the XR-dedicated S-NSSAI, which means the XR service. It may include at least one of information about the AF-specific GPSI (generic public subscription identifier), which is an ID for defining the terminals 110-1 and 110-2 in the AF/AS 130, or information about the GPSI. You can. If the group of terminals (or XR devices) 110-1, 110-2 that are provided with the XR service is predetermined, information about the AF-specific SF group ID for defining the group of terminals, User ID At least one of information about or pairing may be included in the subscription information. If the subscription information includes information about the AF-specific SF group ID, the procedure for setting the AF-specific SF group between the terminal (110-1, 110-2) and the AF/AS (130) or indicating the set terminal group The procedure for providing at least one of information about AF-specific SF group ID, information about User ID, or information about pairing to the 5G system can be omitted. According to one embodiment, the information set in step 0 may be updated in the network. According to various embodiments of the present disclosure, elements included in the set information are not limited to the above-described content.

Referring to step 1, UE1 (110-1) and UE2 (110-2) to receive the XR service can access the AF/AS (130) that provides the XR service. According to one embodiment, UE1 (110-1) and UE2 (110-2) may connect to AF/AS (130) through a 5G system or Wi-Fi. Various communication methods may be used for UE1 (110-1) and UE2 (110-2) to access the AF/AS (130).

Referring to step 2, in order to identify UE1 (110-1) and UE2 (110-2) using the same XR service, AF/AS (130) uses UE1 (110-1) and UE2 (110-2). The same AF specific SF Group ID can be assigned (or set) to UE1 (110-1) and UE2 (110-2) through signaling. According to various embodiments of the present disclosure, AF specific SF Group ID may be assigned to a group of terminals provided with the same XR service. Based on the AF specific SF Group ID, the group of terminals 110-1 and 110-2 can be identified. Based on the AF specific SF Group ID, a group of XR service floors (SFs) for providing XR data related to the same XR service to a group of terminals can be identified. According to one embodiment, instead of the AF specific SF Group ID, pairing information between terminals provided with the same XR service, or User ID managed by the email account of the user of the terminals or an application for the XR service may be used. In this disclosure, for convenience of explanation, embodiments using AF specific SF Group ID will be described. However, without being limited thereto, various embodiments of the present disclosure use information not limited to the AF specific SF Group ID in identifying a group of terminals receiving the same XR service and/or a group of related XR service floors (SFs). It can be included.

Referring to step 3, the AF/AS 130 may generate at least one of XR service-related QoS information, scheduling information, or policy information to be applied to the XR service floors identified by the AF specific SF Group ID (hereinafter referred to as “XR service-related (may be referred to as “information”) can be provided to the 5G system. Information provided from the AF/AS 130 may be stored in the UDM 153 or in the UDR 157 through the UDM 153. The information stored in the UDR 157 may be transmitted to the PCF 180 and used to perform XR service-related QoS and/or scheduling for the corresponding XR service floors. XR service-related information includes a multi-modality support indication indicating whether to support multi-modality services for the terminal(s) corresponding to the AF specific SF Group ID or XR service floors for the terminal(s). can do. According to one embodiment, when supporting a multi-modality service, the XR service-related information includes an allowable value ( May include information about allowable delay differences. XR service-related information may include an indicator for selecting the same NG-RAN or an indicator for selecting the same UPF 170 to apply the time difference in delay times.

In the process of providing AF specific SF Group ID or XR service-related information from AF/AS (130) to the 5G system, the terminal(s) corresponding to (belonging to) the AF specific SF Group ID can be identified. A UE ID (e.g., subscription permanent identifier (SUPI), GPSI, AF specific GPSI, or UE IP address, etc.) may be included in the XR service-related information. Some of the XR service-related information may be provided to the corresponding terminals (UE1, UE2) (110-1, 110-2) in the 5G system.

XR service-related information may be referred to as ‘multi-modality service-related information’. XR service-related information can be delivered by the AF/AS (130) to the PCF via the NEF (155) of the 5G system. XR service-related information transmitted from AF/AS 130 may include a number of parameters for QoS and scheduling. Some or all of the parameters included in the XR service-related information may be accepted and applied as is or changed and applied within the 5G system. When at least some of the parameters of the first XR service-related information transmitted from AF/AS 130 to NEF 155 are changed within the 5G system, from PCF 180 to SMF 160, UPF 170, Information related to the second XR service delivered to the NG-RAN (125) may be applied in the UPF (170) and the NG-RAN (125). As described above, XR service-related information transmitted from AF/AS (130) to NEF (155) and XR service transmitted from PCF (180) to SMF (160), UPF (170), and NG-RAN (125) Relevant information can be distinguished. However, the embodiments of the present disclosure are not limited to this, and for convenience of explanation, XR service-related information is described in general terms.

In the present disclosure, information for detecting XR service floor(s) in UPF 170 and SMF 160 (e.g., XR service floor detection information) includes AF/AS ID, source IP address of AF/AS 130, and It may include at least one of port information, information about the ID of an accessory dwelling unit (ADU), which is application-level packet information, or information about a sequence number (SN). XR service floor detection information may be transmitted from AF/AS 130 to PCF 180 through NEF 155. XR service floor detection information may be delivered to the UPF (170) via the PCF (180) and SMF (160).

Although not shown in FIG. 4, UE1 (110-1) or UE2 (110-2) may be reset after step 2 is performed but before step 4, which will be described later, is performed. If UE1 (110-1) or UE2 (110-2) has previously connected to the 5G system, UE1 (110-1) or UE2 (110-2) deregisters from the 5G system and then connects to 5G again. You can perform a registration procedure in the system or create a new PDU session to provide XR services. The procedure for registering or creating a new PDU session after resetting and deregistering UE1 (110-1) or UE2 (110-2) is to provide stable XR service for UE1 (110-1) or UE2 (110-2). , can be performed selectively. Even if UE1 (110-1) or UE2 (110-2) is reset and performs the registration procedure again, information for the XR service allocated to UE (110-1, 110-2) (e.g. GPSI or AF specific GPSI) can be maintained in 5G networks and terminals.

Referring to step 4, the corresponding terminals (110-1, 110-2) belonging to the same AF specific SF Group ID can perform a procedure for establishing a PDU Session to receive the XR service. In the process of establishing a PDU session, the same SMF may be selected for the same AF specific SF Group ID so that multi-modality services can be provided when processing each XR service floor.

Referring to step 5, the SMF 160 selected in step 4 includes the UPF 170 and NG-RAN ( In the process of processing the data packet at 125), QoS is applied based on XR service-related information, and XR data is transmitted to the terminals (110-1) within an allowed delay difference so that the difference in delay times required for scheduling each XR service floor is minimized. , 110-2), so that XR data can be serviced to the user at a similar time. The SMF 160 may allocate an XR dedicated QoS flow identifier (QFI) for each XR service floor to improve the user experience of the XR service. The SMF (160) allocates a separate queue for the XR dedicated QFI to the UPF (170) or NG-RAN (125) and adjusts the difference in delay time for scheduling the XR dedicated QFI for each XR service floor. By doing so, the difference in delay times when XR data is delivered to the terminals 110-1 and 110-2 can be serviced within the allowed delay difference.

In order to efficiently manage the difference in delay time, the SMF (160) can enable the terminals (110-1, 110-2) to receive service through the same UPF (170) and/or the same NG-RAN (125). there is. As shown in step 5, the SMF 160 may additionally select the same UPF 170 according to the policy for multi-modality service received from the PCF 180. The SMF 160 may perform an operation to allow the terminals 110-1 and 110-2 to access the same NG-RAN 125 according to the received policy. Hereinafter, a method for selecting the same NG-RAN 125 will be described below.

According to one embodiment, referring to step 5, at least one of the XR service floor detection information, XR service-related information, or forwarding information delivered to the PCF (180) in step 3 is a PDU Session establishment or PDU session modification process. It can be transmitted from the PCF (180) to the SMF (160). The SMF 160, which has received XR service-related information, allocates an XR-dedicated QFI corresponding to each XR service floor and provides XR service floor detection information, XR service-related information, or forwarding information for each XR service floor. At least one of them may be transmitted to the UPF (170) or the NG-RAN (150). Forwarding information may be information used in the process of transferring (forwarding) data of the XR service flow from the UPF 170 to the NG-RAN 125. An indicator indicating the need for allocation of a dedicated queue for XR-dedicated QFI is included in the information delivered to the UPF 170 or NG-RAN 125, so that the delay time for each XR data can be satisfied. An indicator indicating the need for allocation of a dedicated queue for XR-dedicated QFI is included in the information delivered to the UPF (180) and NG-RAN (125), thereby smoothly measuring and managing the difference in delay time for each XR data. You can also make it possible. The UPF 170 or NG-RAN 125, which has received an indicator indicating the need for allocation of a dedicated queue for an XR-dedicated QFI, may allocate a dedicated queue for the corresponding QFI. The indicator indicating that a dedicated queue needs to be allocated for the XR-dedicated QFI may be omitted from the transmitted information when the information about the XR-dedicated QFI is set in advance in the UPF 170.

Referring to steps 4 and 5, the SMF 160 can recognize a situation in which terminals 110-1 and 110-2 use the same multi-modality service. For example, AF specific SF group ID and corresponding multi-modality support included in AF specific SF group ID information sent by terminals 110-1 and 110-2 or QoS policy information delivered by PCF 180. According to at least one of the indicators, the SMF (160) is a multi-modality service corresponding to the AF specific SF group ID, and it can be seen that UE1 (110-1) and UE2 (110-2) are connected to each other.

Referring to step 6, the SMF (160) may inform the AMF (150) that UE1 (110-1) and UE2 (110-2) are connected to each other as the same multi-modality service. The SMF (160) can take steps to ensure that UE1 (110-1) and UE2 (110-2) receive services through the same NG-RAN (125). Specific details are described below according to various embodiments of the present disclosure.

Referring to step 7, the SMF (160) may transmit at least one of QoS information such as QoS profile or scheduling information to the NG-RAN (125) or UPF (170). According to various embodiments of the present disclosure, step 7 may be performed simultaneously and before step 6.

Referring to step 8, the NG-RAN (125) or UPF (170) may allocate a dedicated queue to XR-dedicated QFIs based on information transmitted from the SMF (160). The NG-RAN (125) or UPF (170) performs queuing and scheduling for the terminals (110-1, 110-2) corresponding to the AF specific SF Group or the XR service flows (or XR specific QFI) of the terminals. The delay time difference can be handled so that it does not exceed the allowed delay difference.

Meanwhile, in explaining each embodiment, this disclosure describes the aspect of processing downlink data in the process of receiving the XR service by the terminal(s), but is not limited thereto. According to various embodiments of the present disclosure, the above-described operation includes information for processing uplink data in the XR service-related information or forwarding information for the XR service, allowing allowable delay in the same way as processing downlink data. It can operate to satisfy difference and QoS requirements.

FIG. 5 illustrates a PDU session establishment procedure and signal flow for performing multi-modality communication in a wireless communication system according to various embodiments of the present disclosure. Specifically, referring to FIG. 5, it may be related to the situation operating in steps 4 to 7 of FIG. 2, and when performing the PDU session establishment procedure for the terminals, the RAN node serving the terminals requiring multi-modality support is identical. Shows how to place it.

Referring to FIG. 5, in step 1, UE1 (110-1) may request PDU Session establishment for the XR service. The PDU Session establishment request may include information about the group of terminals for multi-modality. For example, the PDU Session request message may include AF specific SF Group ID. The request message may be transmitted from the AMF 150 to the SMF 160 through step 2. Referring to step 3, SMF 160 may request SM policy association establishment. SMF (160) can receive QoS policy information for XR service or multi-modality service from PCF (180). The SM policy association establishment request message transmitted by the SMF (160) includes information on DNN (data network name), which is information indicating that the PDU session is for an XR service or multi-modality service, S-NSSAI information, and UE1 (110-1) It may include at least one of part or all of the ID or AF specific SF Group ID. The PCF (130) may transmit XR service-related information or multi-modality service-related information corresponding to the AF specific SF Group ID to the SMF (160).

The SMF 160 can search whether terminals belonging to the AF specific SF Group ID exist based on the received information. According to embodiments of the present disclosure, since UE1 (110-1) is the first terminal for the multi-modality service, other terminals that want to receive the same multi-modality service are not searched, but the present disclosure is not limited to this.

Referring to step 4, the PDU session establishment process for the remaining UE1 (110-1) may be performed.

Referring to step 5, according to one embodiment, UE2 (110-2) may also separately request PDU Session establishment. The request message transmitted by UE2 (110-2) may include information about the UE group for multi-modality. For example, the request message may include an AF specific SF Group ID.

Referring to step 6, AMF (150) uses at least one of part or all of information about DNN, S-NSSAI information, or AF specific SF Group ID to connect UE1 (110-1) and UE2 (110-2). The same SMF (160) can be selected for the same XR service or multi-modality service.

Referring to step 7, the AMF 150 may transmit a PDU Session establishment request message to the SMF.

Referring to step 8, the SMF 160 may receive QoS policy information for the XR service or multi-modality service from the PCF 180 through transmission and reception of an SM policy association establishment request message. The SM policy association establishment request message sent by the SMF (160) includes DNN, S-NSSAI information, ID of UE2 (110-2), or AF specific SF Group ID, which is information indicating that the PDU session is for XR service or multi-modality service. It may include at least one of some or all of them. The PCF (180) may transmit XR service-related information or multi-modality service-related information corresponding to the AF specific SF Group ID to the SMF (160). Based on the received information, the SMF 160 can search whether terminals belonging to the AF specific SF Group ID exist.

According to various embodiments of the present disclosure, UE1 (110-1) can be discovered because the SMF (160) identifies and stores that UE1 (110-1) also belongs to the AF specific SF Group ID. Therefore, referring to step 9, the SMF (160) can see that UE1 (110-1) and UE2 (110-2) correspond to the AF specific SF Group ID and have connected to the network to receive the same multi-modality service.

Referring to step 11, the SMF (160) may perform NG-RAN redirection or handover to make the NG-RAN (125) the same. According to one embodiment, without being limited to the above-described example, step 11 is performed after the remaining portion of the PDU session request process for the terminal is performed, such as step 10, or step 11 is performed after step 10 is performed, or Alternatively, the messages of steps 10 and 11 may be transmitted and received together.

Referring to step 12, in order to perform NG-RAN redirection or handover to make the NG-RAN (125) the same, UE1 (110-1) and UE2 (110-2) are terminals for the same multi-modality service. The recognized SMF (160) can transmit a multi-modality ready request message to the AMF (150). By sending a message to the AMF (150), the SMF (160) can inform the AMF (150) that the terminals (110-1, 110-2) for the same service must receive the service from the same NG-RAN (125) for the multi-modality service. . The multi-modality ready request message includes the ID of UE1 (110-1), which is the ID of the terminals, and the ID of UE2 (110-2), a Multi-Modality Indication indicating that the terminals perform the same multi-modality service, or for a multi-modality service. It may include at least one of part or all of the AF specific SF Group ID representing the group.

Referring to step 13, the AMF 150, which has received the multi-modality ready request message, can check whether UE1 110-1 and UE2 110-2 are in the same NG-RAN 125. If UE1 and UE2, which are terminals providing the same multi-modality service, belong to the same NG-RAN, they can notify the SMF 160 that they belong to the same NG-RAN 125. According to one embodiment, the AMF 150 may perform the above-described notification to the SMF 160 as in step 19.

Referring to step 14, when the AMF (150) determines that UE1 (110-1) and UE2 (110-2) belong to different NG-RANs, redirection may be requested for the UEs. For example, in order to redirect UE2 (110-2), which is the terminal that requested a PDU session at a subsequent time, to RAN1 (125-1), which is the NG-RAN that UE1 (110-1) is serving, AMF ( 15) can send an N2 request message to RAN2 (125-2), which was serving UE2 (110-2). The N2 request message contains information about the ID of UE2 (110-2) or information about RAN1 (125-1) to be transferred (e.g., RAN1's Cell ID, Node ID information, TA information, or RAN1's IP address information). It may include at least one of (at least one).

RAN2 (125-2), which has received the N2 request message, sends an RRC message (e.g., RRC release message) to UE2 (110-2) in order to redirect UE2 (110-2) to RAN1 (125-1). It can be sent to (110-2). The message transmitted by RAN2 (125-2) may include information on RAN1 (125-1) (for example, at least one of the Cell ID or Node ID of RAN1 (125-1)). UE2 (110-2), which has received the redirection message, can transmit an RRC message to RAN1 (125-1). As described above, the service terminal (110-2) can be moved to RAN1 (125-1).

Referring to step 17, RAN1 (125-1) may transmit an N2 path switch request to AMF (150).

Referring to step 18, AMF 150 may confirm that UE1 110-1 and UE2 110-2 are in the same RAN 125-1.

Referring to step 19, AMF (150) may inform SMF (160) that UE1 (110-1) and UE2 (110-2) are in the same RAN (125-1) and are capable of multi-modality service. there is.

Referring to step 20, AMF (150) may inform RAN1 (125-1) that a path switch has been performed. AMF (150) transmits information including the ID of UE1 (110-1) and the ID of UE2 (110-2) along with the Multi-Modality Indication to RAN1 (125-1), thereby communicating with UE1 (110-1). UE2 (110-2) may notify that it should receive service from the same NG-RAN (125-1).

According to one embodiment, as a method for the SMF (160) to allow the AMF (150) to recognize that the terminals belong to the same RAN (125-1), in step 12, the SMF (150) tells the AMF (150) to UE1 (110-1) and When UE2 (110-2) becomes the same, a subscription request can be made to send a notification. The SMF (160) may request the AMF (150) to subscribe to send a notification when UE1 (110-1) and UE2 (110-2) are different, and in step 19, the SMF sends a notification according to the situation. (160) may know that UE1 (110-1) and UE2 (110-2) are in the same RAN (125-1) and are capable of multi-modality service.

According to one embodiment, handover to UE2 (110-2) may be performed in steps 14 to 20 described above. For the handover process, when UE2 (110-2) finds in step 15 that redirection to RAN1 (125-1) is necessary, the process of various handover scenarios listed in 3GPP TS 23.502 can be used. For example, the target Node of UE2 (110-2) may be set to RAN1 (125-1) and a handover procedure may be performed. In the process of handover to RAN1 (125-1), when UE1 (110-1) and UE2 (110-2) recognize that they receive services from RAN1 (125-1), which is the same NG-RAN, as in step 18. , As in steps 19 to 20, the AMF (150) confirms with RAN1 (125-1) that UE1 (110-1) and UE2 (110-2) are in the same RAN (125-1) for the same multi-modality service. It may also be notified to the SMF 150 respectively. Steps 19 and 20 described above may be included in the same message as the message generated during the handover process.

According to one embodiment, during the entire process of step 11, if a situation occurs in which UE1 (110-1) and UE2 (110-2) cannot be in the same RAN through redirection or handover, AMF (150) performs step In response to 12, a message indicating that the multi-modality preparation situation has failed can be transmitted to the SMF (160).

FIG. 6 illustrates a signal flow for performing handover and multi-modality communication of a terminal in a wireless communication system according to various embodiments of the present disclosure. Specifically, referring to FIG. 6, while UE1 (110-1) and UE2 (110-2) are receiving services from the same NG-RAN and receiving multi-modality services, one UE performs a handover and moves to another NG-RAN. When it is necessary to move, other terminals also perform handover to the same NG-RAN and show the signal flow to continuously maintain multi-modality service.

According to various embodiments of the present disclosure, with reference to the method of performing handover in various handover scenarios presented in 3GPP TS 23.502, other terminals that also receive multi-modality services can move to the same NG-RAN. The method for this is described.

Referring to FIG. 6, referring to step 1, when UE (110-1)1 and UE2 (110-2) are receiving the same multi-modality service through the same NG-RAN and SMF, steps 1a, 1b, and As in step 1c, the RAN, AMF (150), and SMF (160) use the ID of UE1 (110-1), the ID of UE2 (110-2), and the Multi-Modality Indication indicating that the terminals represent the same multi-modality service. At least one of the AF specific SF Group IDs representing the group for the multi-modality service can be stored, respectively.

Referring to step 2, when one of the terminals 110-1 and 110-2 (e.g., UE1 (110-1)) requires handover, the Serving NG-RAN (125-3) sends the other terminal ( Example: UE2 (110-2) can also be controlled to handover from UE1 (110-1) to the same target NG-RAN (125-4) as the target NG-RAN (125-4) to which UE1 (110-1) wishes to handover. there is.

Referring to step 3, during the handover process of each terminal, the serving NG-RAN (125-3) may transmit a source to target transport container message to the target NG-RAN (125-4). The container message includes AF specific SF Group ID indicating a group for multi-modality service, Multi-Modality Indication indicating the same multi-modality service, or ID of UE1 (110-1) and ID of UE2 (110-2), which are the IDs of the terminals. It may include at least one of some and all.

According to one embodiment, the handover process involving the source to target transport container may be similar to the handover process presented in 3GPP TS 23.502.

Referring to step 3a, during the process of step 3 or after step 3 is completed, the AMF 150 may know that UE1 110-1 and UE2 110-2 receive service from the same RAN.

Referring to step 3b, the AMF 150 may transmit an N2 message to the target NG-RAN 125-4 regarding the situation learned through step 3a. The N2 message transmitted by the AMF 150 includes AF specific SF Group ID indicating a group for a multi-modality service, Multi-Modality Indication indicating the same multi-modality service, or the ID of UE1 (110-1), which is the ID of the terminals, and UE2. It may include at least one of some or all of the IDs of (110-2).

Referring to step 3c, AMF 150 may transmit a PDU Session update message to SMF 160. The update message transmitted by the AMF (150) is an AF specific SF Group ID indicating a group for a multi-modality service, a Multi-Modality Indication indicating the same multi-modality service, or an ID of the terminals to the target NG-RAN (125-4). It may include at least one of part or all of the ID of UE1 (110-1) and the ID of UE2 (110-2). The AMF (150) may inform the SMF (160) that UE1 (110-1) and UE2 (110-2) receive services from the same RAN and that multi-modality services are continuously possible.

According to one embodiment, in the process of Figure 3c, when the SMF (160) recognizes that UE1 (110-1) and UE2 (110-2) belonging to the same multi-modality service receive different NG-RANs, Figure 5 As shown throughout step 11, the SMF 160 can control the AMF 150 to prepare the Multi-Modality service and redirect or handover the terminals so that they can receive the service from the same RAN.

FIG. 7 illustrates another signal flow for performing handover and multi-modality communication of a terminal in a wireless communication system according to various embodiments of the present disclosure. Specifically, referring to FIG. 7, while UE1 (110-1) and UE2 (110-2) are receiving a multi-modality service from the same NG-RAN, one terminal hands over and transfers to another NG-RAN. When it is necessary to move to , other terminals also perform handover to the same NG-RAN and continuously maintain multi-modality service.

According to various embodiments of the present disclosure, with reference to the method of performing handover in various handover scenarios presented in 3GPP TS 23.502, other terminals that also receive multi-modality services can move to the same NG-RAN. The method for this is described.

Referring to Figure 7, referring to step 1, when UE1 (110-1) and UE2 (110-2) are receiving the same multi-modality service through the same NG-RAN and SMF, steps 1a, 1b, and As in 1c, the RAN, AMF (150), and SMF (160) display the ID of the terminal UE1 (110-1), the ID of the UE2 (110-2), and the Multi-Modality Indication indicating that the terminals represent the same multi-modality service. At least one of the AF specific SF Group IDs representing the group for the multi-modality service can be stored, respectively.

Referring to step 2, one of the terminals 110-1 and 110-2 (eg, UE1 (110-1)) may perform handover. In the process of one terminal handover, the serving NG-RAN (135-3) may transmit a source to target transport container message to the target NG-RAN (135-4). The container message includes AF specific SF Group ID indicating a group for multi-modality service, Multi-Modality Indication indicating the same multi-modality service, or ID of UE1 (110-1), which is the ID of the terminals, and part of the ID of UE2 (110-2). and may include at least one of all.

According to one embodiment, the handover process involving the source to target transport container may be similar to the handover process presented in 3GPP TS 23.502.

Referring to step 3, during the process of handover to UE1 (110-1) as in step 2, a handover operation may be performed for another terminal UE2 providing the same multi-modality service as described below. there is.

Serving NG-RAN (125-3) uses AF specific SF Group ID indicating a group for a multi-modality service, Multi-Modality Indication indicating the same multi-modality service, or the ID of UE1 (110-1) and UE2, which are the IDs of the terminals. If it has at least one of part or all of the ID of (110-2), when the AMF (150) sends the HO command message to the serving RAN (135-3) in step 2, the HO command message is sent to the Target NG. -If the ID of the RAN (135-4) is included, when the target NG-RAN (135-4) sends a message to the serving NG RAN (135-3), the message contains the ID of the target NG-RAN (135-4) When included, or when the handover process for UE1 (110-1) is completed, the serving NG-RAN (135-3) serves the same target NG-RAN (135-4) for UE2 (110-2). A handover process can be performed.

According to one embodiment, the HO command message received by the serving NG-RAN (135-3) or the message transmitted from the target NG-RAN (135-4) includes AF specific SF Group ID indicating a group for multi-modality service, It may include at least one of the Multi-Modality Indication indicating the same multi-modality service or part or all of the ID of UE1 (110-1) and the ID of UE2 (110-2), which are IDs of terminals, through which UE2 (110) For -2), the handover process can be performed on the same target NG-RAN (135-4). According to one embodiment, when only UE1 (110-1) is handed over as in step 2 and the NG-RAN in which UE1 (110-1) and UE2 (110-2) receive services are different, AMF (150) As in step 3a, the SMF 160 can be notified that the Multi-Modality service is not yet ready.

Referring to step 4, the handover process for UE2 (110-2) is shown. Referring to step 4, during the handover process, the serving NG-RAN (135-3) may transmit a source to target transport container message to the target NG-RAN (135-4). The container message includes AF specific SF Group ID indicating a group for multi-modality service, Multi-Modality Indication indicating the same multi-modality service, or ID of UE1 (110-1) and ID of UE2 (110-2), which are the IDs of the terminals. It may include at least one of some and all. According to one embodiment, the handover process involving the source to target transport container may be similar to the handover process presented in 3GPP TS 23.502.

Referring to step 4a, during the process of step 4 or after step 4 ends, the AMF (150) can see that UE1 (110-1) and UE2 (110-2) receive service from the same RAN. Although not shown in FIG. 7, the AMF (150) may perform the PDU Session establishment procedure shown in FIGS. 4 and 5, and the AMF (150) that has received the multi-modality preparation request message from the SMF (160) may perform UE1 ( It can be seen that UE2 (110-1) and UE2 (110-2) receive services from the same RAN.

Referring to step 4b, the AMF 150 may transmit an N2 message including the learned situation to the target NG-RAN 135-4. The N2 message is an AF specific SF Group ID indicating a group for a multi-modality service, a Multi-Modality Indication indicating the same multi-modality service, or the ID of UE1 (110-1) and the ID of UE2 (110-2), which are the IDs of the terminals. It may include at least one of some and all.

Referring to step 4c, AMF 150 may transmit a PDU Session update message to SMF 160. The update message transmitted by the AMF (150) is an AF specific SF Group ID indicating a group for a multi-modality service, a Multi-Modality Indication indicating the same multi-modality service, or an ID of the terminals to the target NG-RAN (135-4). It may include at least one of part or all of the ID of UE1 (110-1) and the ID of UE2 (110-2). The AMF (150) may inform the SMF (160) that UE1 (110-1) and UE2 (110-2) receive services from the same RAN and that multi-modality services are continuously possible.

According to one embodiment, in steps 3a to 4c, when the SMF (160) recognizes that UE1 (110-1) and UE2 (110-2) belonging to the same multi-modality service receive service from different NG-RANs. , As shown throughout step 11 of FIG. 3, the SMF (160) controls the AMF (150) to prepare the Multi-Modality service and can redirect or handover the terminals so that they can receive the service from the same RAN. .

According to various embodiments of the present disclosure, in a wireless communication system, a method performed by a session management function (SMF) includes receiving a PDU session creation request message or a second request message for a first terminal from an access and mobility management function (AMF). Receiving at least one of a PDU session creation request message for the terminal; Transmitting at least one session policy association establishment request message based on a policy function (PCF) PDU session creation request message; Receiving at least one message containing information about a multi-modality service from the PCF; Identifying whether a radio access network (RAN) connected to the first terminal and a RAN connected to the second terminal are the same; And when the first terminal and the second terminal are connected to a common RAN, at least one of quality of service (QoS) information or scheduling information related to the first terminal and the second terminal is used in the common RAN or user plane function (UPF). It may include transmitting to at least one, and at least one of the QoS information or scheduling information may be used to control the difference in delay time occurring between the first terminal and the second terminal.

According to one embodiment, the step of identifying whether the RAN connected to the first terminal and the RAN connected to the second terminal include transmitting a multi-modality preparation request message instructing the AMF to connect to the common RAN. steps; And it may further include receiving a multi-modality ready ACK (acknowledge) message from the AMF indicating that the RAN connected to the first terminal and the RAN connected to the second terminal are the same RAN.

According to one embodiment, information about the multi-modality service received from the PCF may include information about a plurality of terminal groups for the multi-modality service.

According to one embodiment, the multi-modality preparation request message includes the ID (identifier) of the first terminal, the ID of the second terminal, and the multi-modality service indicating reception of the same multi-modality service by the first terminal and the second terminal. It may include at least one of a modality indication or information about a plurality of terminal groups for a multi-modality service.

According to various embodiments of the present disclosure, in a wireless communication system, a method performed by an access mobility and management function (AMF) is a method in which a first terminal and a second terminal have a common radio access (RAN) from a session management function (SMF). receiving a multi-modality preparation request message indicating that a connection to a network is required; Identifying whether the RAN connected to the first terminal and the RAN connected to the second terminal are the same; Based on the identification, transmitting an N2 request message containing information about the RAN connected to the first terminal to the RAN connected to the second terminal; Receiving an N2 path change request message from a RAN connected to the first terminal indicating that the second terminal is connected to a RAN connected to the first terminal; And it may include transmitting a multi-modality ready ACK (acknowledge) message notifying the SMF that the first terminal and the second terminal are connected to a common RAN.

According to one embodiment, the method includes transmitting a handover command message notifying the common RAN that the first terminal has handed over to the target RAN; And it may further include transmitting a notification message informing the SMF that multi-modality is not ready.

According to one embodiment, the method includes receiving a multi-modality preparation request message from the SMF; And it may further include identifying that the first terminal and the second terminal are connected to the target RAN.

According to one embodiment, the handover command message may include information about the target RAN.

According to one embodiment, the N2 path change request message may include information about the RAN connected to the first terminal.

According to one embodiment, the method further includes the step of transmitting an N2 path change response message to the RAN connected to the first terminal notifying that the first terminal and the second terminal are connected to a common RAN, and the N2 The route change response message is at least one of an ID (identifier) of the first terminal, an ID of the second terminal, or a multi-modality indicator indicating reception of the same multi-modality service by the first terminal and the second terminal. may include.

According to various embodiments of the present disclosure, in a wireless communication system, a session management function (SMF) device includes at least one transceiver; and at least one processor functionally coupled to the at least one transceiver, wherein the at least one processor receives a PDU session creation request message or a PDU session creation request message for the first terminal from an access and mobility management function (AMF). 2 Receive at least one of the PDU session creation request messages for the terminal, transmit at least one session policy association establishment request message based on the PCF (policy function) PDU session creation request message, and receive information about the multi-modality service from the PCF. Receive at least one message containing information, identify whether a radio access network (RAN) connected to the first terminal and a RAN connected to the second terminal are the same, and the first terminal and the second terminal When connected to this common RAN, it may be configured to transmit at least one of quality of service (QoS) information or scheduling information related to the first terminal and the second terminal to at least one of the common RAN or user plane function (UPF), At least one of the QoS information or scheduling information may be used to control the difference in delay time occurring between the first terminal and the second terminal.

According to one embodiment, in order to identify whether the RAN connected to the first terminal and the RAN connected to the second terminal are the same, the at least one processor configures the AMF to connect to the common RAN. It may be further configured to transmit a modality preparation request message and receive a multi-modality preparation ACK (acknowledge) message from the AMF indicating that the RAN connected to the first terminal and the RAN connected to the second terminal are the same RAN.

According to one embodiment, information about the multi-modality service received from the PCF may include information about a plurality of terminal groups for the multi-modality service.

According to one embodiment, the multi-modality preparation request message includes the ID (identifier) of the first terminal, the ID of the second terminal, and the multi-modality service indicating reception of the same multi-modality service by the first terminal and the second terminal. It may include at least one of a modality indication or information about a plurality of terminal groups for a multi-modality service.

According to various embodiments of the present disclosure, in a wireless communication system, an access mobility and management function (AMF) device includes at least one transceiver; and at least one processor functionally coupled to the at least one transceiver, wherein the at least one processor is configured to enable the first terminal and the second terminal to use a common radio access network (RAN) from a session management function (SMF). ) Receive a multi-modality preparation request message indicating that it should be connected to, identify whether the RAN connected to the first terminal and the RAN connected to the second terminal are the same, and based on the identification, connect to the second terminal. An N2 path that transmits an N2 request message containing information about the RAN connected to the first terminal to the connected RAN, and informs the RAN connected to the first terminal that the second terminal is connected to the RAN connected to the first terminal. It may be configured to receive a change request message, and to transmit a multi-modality ready ACK (acknowledge) message notifying the SMF that the first terminal and the second terminal are connected to a common RAN.

According to one embodiment, the at least one processor transmits a handover command message to the common RAN notifying that the first terminal has handed over to the target RAN, and notifies the SMF that multi-modality is not ready. It may be further configured to send a notification message.

According to one embodiment, the at least one processor may be further configured to receive a multi-modality preparation request message from the SMF, and identify that the first terminal and the second terminal are connected to the target RAN.

According to one embodiment, the handover command message may include information about the target RAN.

According to one embodiment, the N2 path change request message may include information about the RAN connected to the first terminal.

According to one embodiment, the at least one processor may be further configured to transmit, to the RAN connected to the first terminal, an N2 path change response message notifying that the first terminal and the second terminal are connected to a common RAN, , the N2 route change response message includes an identifier (identifier) of the first terminal, an ID of the second terminal, or a multi-modality indicator indicating reception of the same multi-modality service by the first terminal and the second terminal. It may include at least one of:

Claims (20)

In a wireless communication system, the method performed by SMF (session management function) is,
Receiving at least one of a PDU session creation request message for a first terminal or a PDU session creation request message for a second terminal from an access and mobility management function (AMF);
Transmitting at least one session policy association establishment request message based on a policy function (PCF) PDU session creation request message;
Receiving at least one message containing information about a multi-modality service from the PCF;
Identifying whether a radio access network (RAN) connected to the first terminal and a RAN connected to the second terminal are the same; and
When the first terminal and the second terminal are connected to a common RAN, at least one of quality of service (QoS) information or scheduling information related to the first terminal and the second terminal is provided to at least one of the common RAN or the user plane function (UPF). comprising transmitting to one,
A method in which at least one of the QoS information or scheduling information is used to control a difference in delay time occurring between the first terminal and the second terminal.
The method according to claim 1, wherein the step of identifying whether the RAN connected to the first terminal and the RAN connected to the second terminal is the same,
Transmitting a multi-modality preparation request message to the AMF indicating connection with the common RAN; and
The method further comprising receiving a multi-modality ready ACK (acknowledge) message from the AMF indicating that the RAN connected to the first terminal and the RAN connected to the second terminal are the same RAN.
The method according to claim 1, wherein the information on the multi-modality service received from the PCF is:
A method of including information on a plurality of terminal groups for the multi-modality service.
The method of claim 2, wherein the multi-modality preparation request message is:
ID (identifier) of the first terminal, ID of the second terminal, multi-modality indicator (indication) indicating reception of the same multi-modality service by the first terminal and the second terminal, or a plurality of terminals for the multi-modality service How to include at least one piece of information about the group.
In a wireless communication system, the method performed by AMF (access mobility and management function) is,
Receiving a multi-modality preparation request message from a session management function (SMF) indicating that the first terminal and the second terminal should be connected to a common radio access network (RAN);
Identifying whether the RAN connected to the first terminal and the RAN connected to the second terminal are the same;
Based on the identification, transmitting an N2 request message containing information about the RAN connected to the first terminal to the RAN connected to the second terminal;
Receiving an N2 path change request message from a RAN connected to the first terminal indicating that the second terminal is connected to a RAN connected to the first terminal; and
A method comprising transmitting a multi-modality ready ACK (acknowledge) message to the SMF notifying that the first terminal and the second terminal are connected to a common RAN.
The method of claim 5, wherein the method:
Transmitting a handover command message notifying the common RAN that the first terminal has handed over to the target RAN; and
The method further includes transmitting a notification message informing the SMF that multi-modality is not ready.
The method of claim 6, wherein the method:
Receiving a multi-modality preparation request message from the SMF; and
The method further includes identifying that the first terminal and the second terminal are connected to the target RAN.
The method of claim 6, wherein the handover command message is:
A method including information about the target RAN.
The method of claim 5, wherein the N2 route change request message is:
A method including information about the RAN connected to the first terminal.
The method of claim 5, wherein the method:
Further comprising transmitting an N2 route change response message to the RAN connected to the first terminal notifying that the first terminal and the second terminal are connected to a common RAN,
The N2 route change response message is one of the ID (identifier) of the first terminal, the ID of the second terminal, or a multi-modality indicator (indication) indicating reception of the same multi-modality service by the first terminal and the second terminal. How to include at least one.
In a wireless communication system, a session management function (SMF) device,
at least one transceiver; and
Comprising at least one processor functionally coupled to the at least one transceiver,
The at least one processor,
Receiving at least one of a PDU session creation request message for a first terminal or a PDU session creation request message for a second terminal from an access and mobility management function (AMF),
Send at least one session policy association establishment request message based on the PCF (policy function) PDU session creation request message,
Receive at least one message containing information about a multi-modality service from the PCF,
Identify whether a RAN (radio access network) connected to the first terminal and a RAN connected to the second terminal are the same, and
When the first terminal and the second terminal are connected to a common RAN, at least one of quality of service (QoS) information or scheduling information related to the first terminal and the second terminal is provided to at least one of the common RAN or the user plane function (UPF). configured to transmit to one,
A device wherein at least one of the QoS information or scheduling information is used to control a difference in delay time occurring between the first terminal and the second terminal.
The method of claim 11, wherein in order to identify whether the RAN connected to the first terminal and the RAN connected to the second terminal are the same, the at least one processor:
Transmit a multi-modality preparation request message to the AMF indicating connection with the common RAN, and
The device further configured to receive a multi-modality ready ACK (acknowledge) message from the AMF indicating that the RAN connected to the first terminal and the RAN connected to the second terminal are the same RAN.
The method in claim 11, wherein the information on the multi-modality service received from the PCF is:
A device including information on a plurality of terminal groups for the multi-modality service.
The method of claim 12, wherein the multi-modality preparation request message is:
ID (identifier) of the first terminal, ID of the second terminal, multi-modality indicator (indication) indicating reception of the same multi-modality service by the first terminal and the second terminal, or a plurality of terminals for the multi-modality service A device that contains at least one piece of information about a group.
In a wireless communication system, an access mobility and management function (AMF) device is,
at least one transceiver; and
Comprising at least one processor functionally coupled to the at least one transceiver,
The at least one processor,
Receiving a multi-modality preparation request message from a session management function (SMF) indicating that the first terminal and the second terminal should be connected to a common radio access network (RAN),
Identify whether the RAN connected to the first terminal and the RAN connected to the second terminal are the same,
Based on the identification, transmitting an N2 request message containing information about the RAN connected to the first terminal to the RAN connected to the second terminal,
Receiving an N2 path change request message from the RAN connected to the first terminal indicating that the second terminal is connected to the RAN connected to the first terminal, and
A device configured to transmit a multi-modality ready ACK (acknowledge) message notifying the SMF that the first terminal and the second terminal are connected to a common RAN.
The method of claim 15, wherein the at least one processor:
Transmitting a handover command message to the common RAN notifying that the first terminal has handed over to the target RAN, and
The device is further configured to send a notification message informing the SMF that multi-modality is not ready.
The method of claim 16, wherein the at least one processor:
Receive a multi-modality preparation request message from the SMF, and
The device is further configured to identify that the first terminal and the second terminal are connected to the target RAN.
The method of claim 16, wherein the handover command message:
A device including information about the target RAN.
The method of claim 15, wherein the N2 route change request message is:
A device including information about the RAN connected to the first terminal.
The method of claim 15, wherein the at least one processor:
Further configured to transmit, to the RAN connected to the first terminal, an N2 route change response message notifying that the first terminal and the second terminal are connected to a common RAN,
The N2 route change response message is one of the ID (identifier) of the first terminal, the ID of the second terminal, or a multi-modality indicator (indication) indicating reception of the same multi-modality service by the first terminal and the second terminal. A device containing at least one.

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