Method and apparatus for managing edge computing service session in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a first session management function (SMF) entity includes receiving a request message for a protocol data unit (PDU) session associated with a home routing (HR) local session from a second SMF entity; receiving, from a Unified Data Management (UDM) entity, information about an Aggregated Maximum Bit Rate (AMBR) of the HR local session; receiving, from a policy control function (PCF) entity, an authorized AMBR of the HR local session generated based on the information about the AMBR; and sending a response message including the authorized AMBR to the second SMF.

Description

Technical Field

[0001] The present disclosure relates to wireless communication systems, and more particularly, to methods and apparatus for managing edge computing service sessions in wireless communication systems. Background Art

[0002] 5G mobile communication technology defines a wide frequency band, making high transmission rates and new services possible, and can be implemented not only in "sub-6 GHz" frequency bands such as 3.5 GHz, but also in "higher than 6 GHz" frequency bands called millimeter waves including 28 GHz and 39 GHz. In addition, it has been considered to implement 6G mobile communication technology (called super 5G system) in terahertz (THz) frequency bands (e.g., 95 GHz to 3 THz frequency bands) in order to achieve a transmission rate 50 times faster than 5G mobile communication technology and an ultra-low latency of one tenth of 5G mobile communication technology.

[0003] At the beginning of the development of 5G mobile communication technology, in order to support services and meet performance requirements related to enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC) and massive machine type communication (mMTC), standardization is underway on the following items: beamforming and massive MIMO for reducing radio wave path loss and increasing radio wave transmission distance in millimeter waves, parameter sets supporting efficient utilization of millimeter wave resources and dynamic operation of time slot formats (for example, operating multiple subcarrier spacings), initial access technology for supporting multi-beam transmission and broadband, definition and operation of BWP (bandwidth part), new channel coding methods (such as LDPC (low-density parity check) codes for large-scale data transmission) and polarization codes for highly reliable transmission of control information, L2 preprocessing, and network slicing for providing dedicated networks dedicated to specific services.

[0004] Currently, in view of the services that 5G mobile communication technology is to support, discussions are ongoing on improvements and performance enhancements of initial 5G mobile communication technology, and there is already physical layer standardization on technologies such as V2X (Vehicle to Everything) for assisting driving determination of autonomous vehicles based on information about the location and status of the vehicle sent by the vehicle and for enhancing user convenience, NR-U (New Radio Unlicensed) for system operation designed to comply with various regulation-related requirements in unlicensed bands, NR UE energy saving, non-terrestrial network (NTN) as UE-satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable, and positioning.

[0005] In addition, there has been standardization in the air interface architecture / protocol on technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and integration with other industries, IAB (Integrated Access and Backhaul) for providing nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner, mobility enhancements including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access (two-step RACH for NR) for simplifying the random access process. There is also ongoing standardization on the 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software defined network (SDN) technologies, and system architecture / services for mobile edge computing (MEC) for receiving services based on UE location.

[0006] With the commercialization of 5G mobile communication systems, an exponentially growing number of connected devices will be connected to the communication network, so it is expected that enhanced functions and performance of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is arranged in conjunction with extended reality (XR) to effectively support AR (augmented reality), VR (virtual reality), MR (mixed reality), etc., to improve 5G performance and reduce complexity by utilizing artificial intelligence (AI) and machine learning (ML), AI service support, metaspace service support, and drone communication.

[0007] In addition, such development of 5G mobile communication systems will serve not only as a basis for developing new waveforms for providing coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional spatial multiplexing technology using OAM (orbital angular momentum), and RIS (reconfigurable smart surface), but also as a basis for developing full-duplex technology for improving the frequency efficiency of 6G mobile communication technology and improving system networks, AI-based communication technology for achieving system optimization by utilizing satellites and AI (artificial intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at a complexity level that exceeds the limitations of UE operating capabilities by utilizing ultra-high performance communication and computing resources. Summary of the invention

[0008] Solution to the problem

[0009] The present disclosure relates to a wireless communication network, and more particularly, to a terminal and a communication method thereof in a wireless communication system.

[0010] According to one aspect of the present disclosure, a method performed by a session management function (SMF) includes: an operation of receiving a protocol data unit (PDU) session establishment request message including a home routing (HR) local session establishment allow indicator from an access and mobility management function (AMF); an operation of requesting HR roaming-related user information from a unified data management (UDM) based on the received PDU session establishment request message; an operation of selecting a user plane function (UPF) that supports local access to a data network in a visited network; and an operation of applying an aggregate maximum bit rate (AMBR) associated with an HR local session to the UPF.

[0011] Beneficial effects of the present invention

[0012] Aspects of the present disclosure address at least the above-mentioned problems and / or disadvantages and provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide an efficient communication method in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other aspects, features and advantages of certain embodiments of the present disclosure will be more readily understood from the following description in conjunction with the accompanying drawings.

[0014] Figure 1 A scenario of implementing edge computing configured without distinguishing levels according to an embodiment is shown.

[0015] Figure 2 A service scenario of establishing an edge computing session of a predetermined user equipment (UE) in a home routing roaming scenario according to an embodiment is shown.

[0016] Figure 3 A solution of applying V-SMF based HR local session-AMBR according to an embodiment is shown.

[0017] Figure 4 A solution of applying AMF-based HR local session-AMBR according to an embodiment is shown.

[0018] Figure 5 A solution of applying H-SMF based HR local session-AMBR according to an embodiment is shown.

[0019] Figure 6 A scheme for updating the HR local session - AMBR disclosed by the SMF according to an embodiment is shown.

[0020] Figure 7 A scheme for updating the HR local session-AMBR published by the PCF according to an embodiment is shown.

[0021] Figure 8 A block diagram showing the structure of a UE according to an embodiment.

[0022] Fig. 9 A block diagram showing the structure of a base station according to an embodiment.

[0023] Fig.10 A block diagram showing the structure of a network entity according to an embodiment. DETAILED DESCRIPTION

[0024] Aspects of the present disclosure address at least the above-mentioned problems and / or disadvantages and provide at least the advantages described below.Accordingly, one aspect of the present invention provides a terminal in a wireless communication system and a communication method thereof.

[0025] The disclosed embodiments provide an apparatus and method capable of effectively providing services in a wireless communication system.

[0026] According to an embodiment, a method performed by a session management function (SMF) includes: an operation of receiving a protocol data unit (PDU) session establishment request message including a home routing (HR) local session establishment allow indicator from an access and mobility management function (AMF); an operation of requesting HR roaming-related user information from a unified data management (UDM) based on the received PDU session establishment request message; an operation of selecting a user plane function (UPF) that supports local access to a data network in a visited network; and an operation of applying an aggregate maximum bit rate (AMBR) associated with an HR local session to the UPF.

[0027] According to an embodiment, a method performed by a first session management function (SMF) entity includes: receiving a request message for a protocol data unit (PDU) session associated with a home routing (HR) local session from a second SMF entity; receiving information about an aggregate maximum bit rate (AMBR) of the HR local session from a unified data management (UDM) entity; receiving an authorized AMBR of the HR local session generated based on the information about the AMBR from a policy control function (PCF) entity; and sending a response message including the authorized AMBR to the second SMF.

[0028] According to an embodiment, a method performed by a unified data management (UDM) entity includes: receiving information about a protocol data unit (PDU) session from a first session management function (SMF) entity; and sending information about an aggregate maximum bit rate (AMBR) associated with the PDU session to the first SMF entity, wherein an authorized aggregate maximum bit rate (AMBR) for a home routing (HR) local session is generated based on the information about the AMBR, and wherein, in response to a request message for the PDU session, the authorized AMBR is sent to a second SMF entity.

[0029] According to an embodiment, a first session management function (SMF) entity in a wireless communication system includes: a transceiver; and at least one processor, wherein the at least one processor is coupled to the transceiver and configured to receive a request message for a protocol data unit (PDU) session associated with a home routing (HR) local session from a second SMF entity, receive information about an aggregate maximum bit rate (AMBR) of the HR local session from a unified data management (UDM) entity, receive an authorized AMBR of the HR local session generated based on the information about the AMBR from a policy control function (PCF) entity, and send a response message including the authorized AMBR to the second SMF.

[0030] According to an embodiment, a unified data management (UDM) entity in a wireless communication system includes: a transceiver; and at least one processor, wherein the at least one processor is coupled to the transceiver and configured to receive information about a protocol data unit (PDU) session from a first session management function (SMF) entity, and to send information about an aggregated maximum bit rate (AMBR) associated with the PDU session to the first SMF entity, wherein an authorized AMBR of a home routed (HR) local session is generated based on the information about the AMBR, and wherein the authorized AMBR is sent to a second SMF entity in response to a request message of the PDU session.

[0031] Embodiments of the present invention

[0032] Hereinafter, the operating principle of the present disclosure will be described in detail with reference to the accompanying drawings. When describing the present disclosure, descriptions related to technical contents known in the art and not directly associated with the present disclosure will be omitted. Such omission of unnecessary descriptions is intended to prevent blurring the main idea of ​​the present disclosure and to convey the main idea more clearly. The terms to be described below are terms defined in consideration of the functions in the present disclosure, and may differ depending on the user, the user's intention or habit. Therefore, the definition of terms should be based on the content in the entire specification.

[0033] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In the accompanying drawings and this specification, the same or corresponding elements are provided with the same reference numerals.

[0034] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will be easily understood. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and notify those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims.

[0035] In this article, it will be understood that each box of the flowchart diagram and the combination of boxes in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the function specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can guide the computer or other programmable data processing device to run in a specific way, so that the instructions stored in the computer-usable or computer-readable memory produce a product including an instruction device that implements the function specified in one or more flowchart boxes. The computer program instructions can also be loaded on a computer or other programmable data processing device so that a series of operating steps are performed on a computer or other programmable device to produce a computer-implemented process so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flowchart boxes.

[0036] In addition, each frame of the flowchart diagram can represent a module, segment or part of a code, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions mentioned in the frame may not occur in order. For example, depending on the functions involved, two frames shown in succession can actually be performed substantially simultaneously, or these frames can sometimes be performed in reverse order.

[0037] As used herein, the term "unit" refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, the term "unit" does not always have a meaning limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, the term "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, processes, subroutines, fragments of program code, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by the "unit" can be combined into a smaller number of elements or "units", or divided into a larger number of elements or "units". In addition, elements and "units" can be implemented as one or more CPUs in a reproduction device or a secure multimedia card. In addition, the "unit" in the embodiment can include one or more processors.

[0038] In the following description, for the convenience of description, terms related to network entities and entities of edge computing systems, terms related to messages, terms related to identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms used below, and other terms referring to subjects with equivalent technical meanings may be used.

[0039] The description of the embodiments of the present disclosure is mainly aimed at the new radio (NR) as a wireless access network and packet core 5G system or a 5G core network or as a next generation core (NG core) of the core network in the 5G mobile communication standard specified by the Third Generation Partnership Project (3GPP) as a mobile communication standardization group, but based on the determination of those skilled in the art, the main ideas of the present disclosure can be applied to other communication systems with similar backgrounds through some modifications without significantly departing from the scope of the present disclosure.

[0040] In the following description, for the convenience of description, terms and names defined in 3GPP standards (standards for 5G, NR, Long Term Evolution (LTE) or similar systems) may be used. However, the present disclosure is not limited to these terms and names and can be applied to systems conforming to other standards in the same manner.

[0041] In the following description, a base station is an entity that allocates resources to a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, a "downlink (DL)" refers to a wireless link via which a base station sends a signal to a terminal, and an "uplink (UL)" refers to a wireless link via which a terminal sends a signal to a base station.

[0042] Specifically, the present disclosure may be applied to 3GPP NR (fifth generation mobile communication standard). In addition, the present disclosure may be applied to smart services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. In the present disclosure, the term "eNB" may be used interchangeably with the term "gNB". That is, a base station described as an "eNB" may indicate a "gNB". In addition, the term "terminal" may refer not only to mobile phones, NB-IoT devices, and sensors, but also to other wireless communication devices.

[0043] Wireless communication systems are evolving into broadband wireless communication systems for providing high-speed and high-quality packet data services using communication standards such as 3GPP's High Speed ​​Packet Access (HSPA), LTE, Evolved Universal Terrestrial Radio Access (E-UTRA), Advanced LTE (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), IEEE 802.16e, etc., as well as typical voice-based services.

[0044] As a typical example of a broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) scheme in the downlink (DL) and a single carrier frequency division multiple access (SC-FDMA) scheme in the uplink. The uplink indicates a wireless link through which a UE (or MS) sends data or a control signal to a BS (or eNode B), and the downlink indicates a wireless link through which a base station sends data or a control signal to a UE. The above-mentioned multiple access scheme separates the data or control information of the corresponding users by allocating and operating time-frequency resources for sending data or control information to each user to avoid overlapping with each other, that is, establishing orthogonality.

[0045] Since the 5G communication system as a post-LTE communication system must freely reflect various requirements of users, service providers, etc., it is necessary to support services that meet various requirements. Services considered in the 5G communication system include eMBB communication, mMTC, URLLC, etc.

[0046] According to an embodiment, eMBB is intended to provide a higher data rate than that supported by existing LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, for a single base station, eMBB must provide a peak data rate of 20Gbps in the downlink and a peak data rate of 10Gbps in the uplink. In addition, the 5G communication system must provide an increased user-perceived data rate as well as a maximum data rate to the UE. In order to meet such requirements, it is necessary to improve the transmission / reception technology including further enhanced MIMO transmission technology. In addition, the data rate required by the 5G communication system can be obtained using a frequency bandwidth greater than 20MHz in a frequency band of 3 to 6GHz or 6GHz or higher, rather than using a transmission bandwidth of up to 20MHz to send signals in the 2GHz band used in LTE.

[0047] In addition, mMTC is considered to support application services such as IoT in 5G communication systems. mMTC has requirements such as supporting the connection of a large number of UEs in a cell, enhancing the coverage of UEs, improving battery time, reducing the cost of UEs, etc., in order to effectively provide the Internet of Things. Since IoT provides communication functions while being provided to various sensors and various devices, it must support a large number of UEs in a cell (e.g., 1,000,000 UEs / km^2). In addition, UEs supporting mMTC may require wider coverage than coverage of other services provided by the 5G communication system because the UE may be located in a shadow area, such as a basement of a building, which is not covered by the cell due to the nature of the service. UEs supporting mMTC must be configured to be inexpensive and may require a very long battery life, such as 10 to 15 years, because it is difficult to frequently replace the battery of the UE.

[0048] Finally, URLLC, as a cellular-based mission-critical wireless communication service, can be used for remote control of robots or machines, industrial automation, unmanned aerial vehicles, remote healthcare, emergency alerts, etc. Therefore, URLLC must provide communications with ultra-low latency and ultra-high reliability. For example, services supporting URLLC must meet an air interface delay of less than 0.5ms and also require a packet error rate of 10^-5 or less. Therefore, for services supporting URLLC, the 5G system must provide a shorter transmission time interval (TTI) than other services, and may also require a design for allocating a large amount of resources in the frequency band to ensure the reliability of the communication link.

[0049] The above three services (ie, eMBB, URLLC, and mMTC) considered in the 5G communication system can be multiplexed and transmitted in a single system. In order to meet the different requirements of the corresponding services, different transmission / reception technologies and transmission / reception parameters can be used between services. However, the above mMTC, URLLC, and eMBB are only examples of different types of services, and the service types to which the present disclosure is applied are not limited to the above examples.

[0050] The present disclosure provides a method for configuring and applying quality of service (QoS) (e.g., aggregate maximum bit rate (AMBR)) for edge computing sessions. Specifically, the present disclosure provides a method for specifying edge computing sessions in a single protocol data unit (PDU) session and applying QoS constraints for each local portion of a data network (DN). According to an embodiment, a method is provided for a session management function (SMF) to obtain an AMBR associated with an edge computing session from a policy control function (PCF) and configure it for a user plane function (UPF), and a method for a UPF to apply or implement (enforce) AMBR for an edge computing session in the UPF.

[0051] In the case of an edge computing service session, the traffic in a single PDU session is sent to the local part of the data network via divergence. In cases where it is desired to apply QoS (e.g., AMBR) only to edge computing service traffic, the existing session-AMBR may not be utilized. The existing session-AMBR applies to the maximum bit rate of the entire non-GBR (guaranteed bit rate) QoS flow for a single PDU session, but does not support applying the AMBR only to the traffic sent to the local part of the data network when a single PDU session diverges. This may occur when edge computing services are provided to roaming UEs. For example, in the case of a roaming UE using a home-routed PDU session, the AMBR is not applicable to divergent sessions in the visited network.

[0052] The network operator can generate and apply QoS policies only for edge computing service sessions. The network operator can apply edge computing service policies differently based on the payment system according to such QoS policies. In addition, by managing the QoS of edge computing service sessions in the accessed network when the UE receives roaming services, policies based on service level agreements can be protected.

[0053] Figure 1 A scenario of implementing edge computing configured without distinguishing levels according to an embodiment is shown.

[0054] The 5G system structure supporting home routing (HR) roaming may include various network functions (NFs) (hereinafter, used interchangeably with network entities), and Figure 1The 5G system structure is shown, which includes an access and mobility management function (AMF), a session management function (SMF), a policy control function (PCF), an application function (AF), a unified data management (UDM), a data network (DN), a user plane function (UPF), a (radio) access network ((R)AN) and a UE, which correspond to parts of various functions. The 5G system structure is not limited to this example and may include more Figure 1 The NFs shown may be a greater or lesser number of NFs.

[0055] Each NF may support the following functions, although not limited to the following examples.

[0056] The AMF may provide functions for access and mobility management in a unit of the UE. A single UE may be connected to a single AMF, and the present disclosure is not limited thereto. From the perspective of a UE user, a visited-AMF (V-AMF) is an AMF in a visited network. A home-AMF (H-AMF) is an AMF of a home network of a UE user. Specifically, the AMF may perform at least one of signaling between core network nodes for mobility between 3GPP access networks, an interface (N2 interface) between radio access networks (e.g., 5GRAN), NAS (non-access stratum) signaling with the UE, identification of the SMF, and transmission of session management (SM) messages between the UE and the SMF. Some or all of the functions of the AMF may be supported in a single instance of a single AMF.

[0057] DN may include, for example, a network that provides services, operator services, and Internet access or third-party services. DN may send a downlink protocol data unit (PDU) to UPF, or may receive, from UPF, a PDU sent from a UE.

[0058] The PCF may receive information associated with a packet flow from an application server, and may provide functionality for determining policies associated with mobility management, session management, etc. Specifically, the PCF may support functionality such as supporting a unified policy framework to control network operations, providing policy rules so that control plane functions (e.g., AMF, SMF, etc.) implement policy rules, and implementing a front end for accessing relevant subscription information to determine policies in a user data repository (UDR).

[0059] SMF can provide session management functions, and in the case where the UE has multiple sessions, the sessions can be managed by different SMFs respectively. From the perspective of the UE user, the visited-SMF (V-SMF) is the AMF of the visited network. The home-SMF (H-SMF) is the SMF of the home network of the UE user. Specifically, the SMF can perform at least one of session management (e.g., session establishment, correction and release, including maintaining the tunnel between the UPF and the access network node), selection and control of user plane (UP) functions, service steering configured by the UPF to route the service to the appropriate destination, termination of the SM part of the NAS message, downlink data notification (DDN) and initiator of AN-specific SM information (e.g., by passing through the AMF via the N2 interface to the access network). Some or all of the functions of the SMF can be supported in a single instance of a single SMF.

[0060] UDM can store user subscription data, policy data, etc.

[0061] The UPF transmits the downlink PDU received from the DN to the UE via the (radio) access network ((R)AN), and transmits the uplink PDU received from the UE to the DN via the (R)AN.

[0062] The AF interoperates with the 3GPP core network to provide services (e.g., supporting functions such as application impact on traffic routing, access network capability exposure, interoperation with the policy framework for policy control, etc.).

[0063] In the 3GPP system, the conceptual link connecting NFs in the 5G system is called a reference point. A reference point may also be called an interface. The reference points (hereinafter, used interchangeably with interfaces) included in the 5G system architecture expressed in various embodiments of the present disclosure are as follows:

[0064] -N1: Reference point between UE and AMF

[0065] -N2: Reference point between (R)AN and AMF

[0066] -N3: Reference point between (R)AN and UPF

[0067] -N4: Reference point between SMF and UPF

[0068] -N5: Reference point between PCF and AF

[0069] -N6: Reference point between UPF and DN

[0070] -N7: Reference point between SMF and PCF

[0071] -N8: Reference point between UDM and AMF

[0072] -N9: Reference point between two core UPFs

[0073] -N10: Reference point between UDM and SMF

[0074] -N11: Reference point between AMF and SMF

[0075] -N12: Reference point between AMF and Authentication Server Function (AUSF) 151

[0076] -N13: Reference point between UDM and authentication server functions

[0077] -N14: Reference point between two AMFs

[0078] -N15: Reference point between PCF and AMF in case of non-roaming scenario, and between PCF and AMF in visited network in case of roaming scenario

[0079] -N16: Reference point between V-SMF and H-SMF

[0080] -N24: Reference point between V-PCF and H-PCF

[0081] Figure 2 A service scenario of establishing an edge computing session of a predetermined UE in a home routing roaming scenario according to an embodiment is shown.

[0082] refer to Figure 2 , a home routing (HR) PDU session established by the UE can transmit services via two paths. There may be a general service session in which the transmission from V-UPF1 to the home data network is performed via H-UPF, and an edge computing service session, which diverges from V-UPF1 and in which the transmission to the local part of the data network is performed via V-UPF2, which supports the edge computing service provided in the visited network (visited public land mobile network (VPLMN)). As described above, the edge computing service session that diverges from the HR roaming PDU session and connects to the local part of the data network can be expressed as an HR local session or an HR edge computing session.

[0083] The network operator may apply a separate AMBR to be applied to the HR local session based on operator policy or in response to a request from an edge computing service provider (or application service provider). The AMBR regarding the HR local session may be determined based on a subscribed HR local session-AMBR stored in the UDM or based on an authorized HR local session-AMBR generated from the PCF. (HR local session AMBR: an AMBR that can be expected to be provided across all non-GBR QoS flows toward / from the local part of the data network for the HR PDU session). For example, the V-SMF may receive a subscribed HR local session-AMBR from the UDM in the home operator network of the roaming UE (via the H-SMF), or may receive an authorized HR local session-AMBR generated by the PCF, and at least one of V-UPF1 or V-UPF2 may apply the AMBR to the HR local session.

[0084] Figure 3 A solution of applying V-SMF based HR local session-AMBR according to an embodiment is shown.

[0085] refer to Figure 3 In operation 1, the AMF may receive information associated with whether HR roaming session divergence is allowed (allowing establishment of an HR local session) (i.e., performing subscription retrieval) from the UDM. Whether HR roaming session divergence is allowed is configured for each data network name (DNN), single network slice selection assistance information (S-NSSAI), or public land mobile network (PLMN) ID, and may be stored in the UDM. The AMF provides the UDM with the PLMN ID that the UE currently accesses and the DNN and S-NSSAI information corresponding to the PDU session that is desired to be established, and in response thereto, HR roaming session divergence permission information may be obtained.

[0086] In operation 2, in a case where the AMF receives a PDU session establishment request including a PDU session identifier from the UDM and receives HR local session establishment permission information in operation 1, the AMF may select an SMF capable of establishing an HR local session for the corresponding UE in operation 2b.

[0087] In operation 3, the AMF may send a PDU session establishment request message (Nsmf_PDUSession_CreateSMContext request) to the SMF selected in operation 2. The PDU session establishment request message may include at least one of a PDU session identifier, an HR local session establishment permission indicator, a flag for calling a UDM subscription data management service (an indicator indicating obtaining session management user information from the UDM), and UDM address information.

[0088] In operation 4, based on at least one indicator and a flag for invoking the UDM subscription data management service received from the AMF, the V-SMF may request HR roaming-related user information from the UDM. For example, in the case where the V-SMF receives the HR location session establishment permission indicator and the UDM subscription data management service, the V-SMF may determine to perform a home routing session interruption (HR-SBO) to establish an HR local session (in operation 4a), and may request HR roaming-related user information from the UDM (in operation 4b). In this case, the V-SMF may send the data network information value (data network name (DNN)) of the data network to which the current UE will establish the head PDU session and the slice information value (S-NSSAI) of the slice in which the PDU session will be established to the UDM. In the UDM, the subscribed HR local session-AMBR may be stored for each DNN or S-NSSAI. Alternatively, the subscribed HR local session-AMBR may be stored in the UDM for each combination of PLMN ID / DNN / S-NSSAI (in the case of accessing the same DNN, different session-AMBRs may be applied according to the UE's access network). Alternatively, a subscribed HR local session-AMBR may be generated for each combination of PLMN ID / DNN / Data Network Access Identifier (DNAI) and may be stored in the UDM. In the case where the UDM receives a HR roaming-related user information request from the V-SMF, the UDM may provide the subscribed HR local session-AMBR information in response. In this case, the UDM may provide the subscribed HR local session-AMBR information corresponding to the DNN or S-NSSAI received from the V-SMF.

[0089] In operation 5, in the case where the V-SMF receives the HR local session establishment allow indicator from the AMF in operation 3, the V-SMF may (in operation 5a) select a V-UPF ( Figure 2 The V-UPF2) of the PDU session anchor supports local access to the local part of the data network in the visited network, and can (in operation 5b) select a UPF that acts as an uplink classifier (UL CL) or a branch point (BP), and can configure the user plane service path. In addition, the V-SMF can determine or identify whether the subscribed HR local session-AMBR obtained in operation 4 is applicable to the VPLMN, and can be configured for V-UPF1 and V-UPF2. In addition, the V-SMF can select an edge application server discovery function (EASDF) for the HR roaming UE.

[0090] In operation 6, the V-SMF may select an edge application server discovery function (EASDF) for the HR roaming UE.

[0091] Information associated with whether the subscribed HR local session-AMBR is applicable to the VPLMN and the HR local session AMBR constraint value applicable to the VPLMN, as well as the PDU session identifier, UE identifier, data network access identifier (DNAI) (an identifier indicating an access point of the local part of the data network accessible via V-UPF2), DNN and at least one of S-NSSAI can be sent to the H-SMF. The above information can be included in the PDU session establishment request message (PDUSession_Create_Request) and can be sent.

[0092] In operation 7, the H-SMF may obtain session management related user information from the UDM (subscription data retrieval).

[0093] In operation 8, the H-SMF may perform sending and receiving of SM policy association requests and responses with the H-PCF, and may establish an SM policy association. The H-SMF may provide the H-PCF with at least one of a PDU session identifier, an HR local session AMBR constraint, and a subscribed HR local session-AMBR. In addition, the H-SMF may provide the H-PCF with at least one of a PDU session identifier, a UE identifier, a VPLMN ID, a DNN, a DNAI, and an S-NSSAI. Taking into account at least one of the UE identifier, the VPLMN ID, the HR local session AMBR constraint, and the subscribed HR local session-AMBR received from the H-SMF, the H-PCF may generate an authorized HR local session AMBR value, and may provide it to the H-SMF in response to the SM policy association request. The subscribed HR local session-AMBR and the authorized HR local session AMBR may be configured to be no greater than the session-AMBR value of the HR PDU session including the edge computing service session.

[0094] In operation 9, the H-SMF may select an H-UPF, and may perform an N4 session establishment procedure for connecting the V-UPF1 to the H-UPF.

[0095] In operation 10, the H-SMF may send to the V-SMF at least one of the authorized HR local session AMBR value and the PDU session identifier obtained in operation 8. In the case where the authorized HR local session AMBR is not established in the previous operation, the H-SMF may send to the V-SMF only whether the configuration of the HR local session AMBR constraint value is allowed or whether the application of the subscribed HR local session AMBR is recognized.

[0096] In operation 11, upon receiving the authorized HR local session AMBR from the H-SMF, the V-SMF may provide it to the V-UPF and may apply (or configure) the authorized HR local session AMBR. For example, the V-SMF may configure the authorized HR local session AMBR for the V-UPF (V-UPF1) that performs the function of UL CL or BP. In addition, the V-SMP may configure the corresponding value of V-UPF2.

[0097] In operation 12, the V-SMF may inform the AMF that the HR local session has been successfully established. This may be provided as a response (Nsmf_PDUSession_CreateSMContext response) to the message (Nsmf_PDUSession_CreateSMContext request) in the previous operation 3.

[0098] In operation 13, the AMF may notify the UE that the PDU session has been successfully established (PDU session establishment request).

[0099] Figure 4 A solution of applying AMF-based HR local session-AMBR according to an embodiment is shown.

[0100] refer to Figure 4 In operation 1, the AMF may obtain HR local session AMBR information (whether to apply HR local session AMBR information and subscribed HR local session AMBR value) from the UDM (i.e., perform subscription retrieval). The provided HR local session AMBR information may have different values ​​for each DNN or S-NSSAI, and may be provided together with information associated with whether HR roaming session divergence is allowed.

[0101] In operation 2, when the AMF receives a PDU session establishment request from the UE and the application of the HR local session AMBR is identified as allowed or available in operation 1, the AMF may select an SMF capable of establishing an HR local session in operation 2b.

[0102] In operation 3, the AMF may send a PDU session establishment request message (Nsmf_PDUSession_CreateSMContext request) to the SMF selected in operation 2. The PDU session establishment request message may include at least one of a PDU session identifier, HR local session AMBR information (whether to apply the information and the subscribed HR local session AMBR value), and a HR local session establishment permission indicator.

[0103] In operation 4, the V-SMF may send a SM policy association request to the V-PCF, together with the HR local session establishment permission indicator received from the AMF, the HR local session AMBR information (whether to apply the information and the subscribed HR local session AMBR value), and the PDU session identifier. In addition, the V-SMF may provide the V-PCF with the PDU session identifier, the UE identifier, the VPLMNID, the HPLMNID, the DNAI (an identifier indicating an access point to the local part of the data network accessible via the V-UPF2), the DNN, and the S-NSSAI. In the event that the HR local session AMBR needs to be applied and the subscribed HR local session AMBR value is received, the V-PCF may determine the HR local session AMBR constraint value applicable to the VPLMN, and may provide the V-SMF with the same constraint value as the response to the SM policy association request.

[0104] In operation 5, in the case where the V-SMF receives the HR local session establishment allow indicator from the AMF, the V-SMF may (in operation 5a) select a V-UPF ( Figure 2 V-UPF2), the PDU session anchor supports local access to the local part of the data network in the visited network, and can (in operation 5b) select a UPF that acts as a UL CL or a branching point (BP), and can configure the user plane service path.

[0105] In operation 6, the V-SMF may include the HR local session AMBR constraint value obtained in operation 4, as well as the PDU session identifier, the UE identifier, the DNAI (an identifier indicating an access point of the local part of the DN accessible via the V-UPF2), at least one of the DNN and the S-NSSAI, and the HR local session establishment allow indicator in the PDU session establishment message (PDU session creation request), and may send it to the H-SMF.

[0106] In operation 7, the H-SMF may obtain user information related to establishment of the HR local session (ie, subscription data retrieval) from the UDM.

[0107] In operation 8, the H-SMF may establish an SM policy association by performing transmission or reception of an SM policy association request and response with the H-PCF. The H-SMF may include the PDU session identifier, the HR local session AMBR constraint value, and the subscribed session AMBR value obtained in operation 6 in the SM policy association request message, and may send it to the H-PCF. In addition, the H-SMF may provide the H-PCF with at least one of the PDU session identifier, the UE identifier, and the VPLMN ID. Taking into account the information from the H-SMF, the H-PCF may generate an authorized HR local session AMBR value, and may provide it to the H-SMF as a response to the SM policy association request.

[0108] In operation 9, the H-SMF may establish a connection between the H-UPF and the V-UPF 1. That is, the H-SMF may perform an N4 session establishment procedure to establish a connection between the H-UPF and the V-UPF 1.

[0109] In operation 10, the H-SMF may send the authorized HR local session AMBR value and the PDU session identifier obtained from the H-PCF to the V-SMF. For example, the H-SMF may send the authorized HR local session AMBR value, the PDU session identifier, and the HR local session establishment permission indicator obtained from the H-PCF to the V-SMF via a PDU session establishment response message (PDUSession_Create response).

[0110] In operation 11, the V-SMF may configure the authorized HR local session AMBR value for V-UPF1. In addition, the authorized HR local session AMBR value may also be configured for V-UPF2.

[0111] In operation 12, as a response (Nsmf_PDUSession_CreateSMContext response) to the previous operation 3 (Nsmf_PDUSession_CreateSMContext request), the V-SMF may notify the AMF that the PDU session has been successfully established.

[0112] In operation 13, the AMF may notify the UE that the PDU session has been successfully established (PDU session establishment request).

[0113] Figure 5 A solution of applying H-SMF based HR local session-AMBR according to an embodiment is shown.

[0114] refer to Figure 5In operation 1, the AMF may obtain from the UDM whether HR roaming session divergence is allowed (whether HR local session establishment is allowed) (i.e., performing subscription retrieval). Whether HR roaming session divergence is allowed is configured for each data network name (DNN), single network slice selection assistance information (S-NSSAI), or public land mobile network (PLMN) ID, and may be stored in the UDM. The AMF provides the UDM with the PLMN ID currently visited by the UE and the DNN and S-NSSAI information corresponding to the PDU session to be established, and in response thereto, may obtain information associated with whether HR roaming session divergence is allowed (e.g., an HR local session establishment permission indicator).

[0115] In operation 2, when the AMF receives a PDU session establishment request (PDU session establishment request) including a PDU session identifier from the UE and the application of the UE's HR local session AMBR is identified as allowed or available in operation 1, the AMF can select an SMF capable of establishing an HR local session in operation 2b.

[0116] In operation 3, the AMF may send a PDU session establishment request message (Nsmf_PDUSession_CreateSMContext request) to the SMF selected in the previous operation. The PDU session establishment request message may include at least one of a PDU session identifier and an HR local session establishment permission indicator.

[0117] In operation 4, the V-SMF sends an SM policy association request to the V-PCF, and may send at least one of the HR local session establishment allow indicator, the PDU session identifier, the UE identifier, the VPLMN ID, and the HPLMN ID received from the AMF to the V-PCF.

[0118] In addition, in operation 5, the V-PCF may determine an HR local session AMBR restriction value applicable to the VPLMN (or applicable to a corresponding UE in the VPLMN), and may provide it to the V-SMF as a response to the SM policy association request.

[0119] In operation 6, the V-SMF may (in operation 6a) select a V-UPF ( Figure 2 V-UPF2), which PDU session anchor supports local access to the local part of the data network in the visited network, and can select UPF that acts as UL CL or branch point (BP) (in operation 6b), and can configure the user plane service path.

[0120] In operation 7, the V-SMF may include the HR local session AMBR constraint value obtained in operation 5, as well as at least one of the PDU session identifier, the UE identifier and the DNAI (an identifier indicating an access point to the local part of the data network accessible via V-UPF2), and the HR local session establishment permission indicator in the PDU session establishment message (PDU session creation request), and may send it to the H-SMF.

[0121] In operation 8, the H-SMF may obtain user information related to the establishment of the HR local session (ie, subscription data retrieval) from the UDM. For example, the H-SMF may send to the UDM a data network information value (data network name (DNN)) of the data network to which the current UE will establish a head PDU session and a slice information value (S-NSSAI) of the slice in which the PDU session will be established.

[0122] In the UDM, the subscribed HR local session-AMBR can be stored for each DNN or S-NSSAI. Alternatively, the subscribed HR local session-AMBR can be stored for each combination of PLMN ID / DNN / S-NSSAI (different session-AMBRs can be applied according to the UE's access network when accessing the same DNN). Alternatively, a subscribed HR local session-AMBR can be generated for each combination of PLMN ID / DNN / S-NSSAI / Data Network Access Identifier (DNAI) and can be stored in the UDM. In the case where the UDM receives a HR roaming-related user information request from the V-SMF, the UDM can provide the subscribed HR local session-AMBR information in response. In this case, the UDM can provide the subscribed HR local session-AMBR information corresponding to the VPLMN ID, DNAI, DNN or S-NSSAI received from the V-SMF.

[0123] In operation 9, the H-SMF may include the HR local session AMBR constraint value and the subscribed session AMBR value, as well as at least one of the UE identifier, VPLMN ID, DNN, S-NSSAI, and DNAI values ​​in the SM policy association request message and send it to the H-PCF (in operation 9.1). Taking into account the value received from the H-SMF, the H-PCF may generate an authorized HR local session AMBR value and may provide it to the H-SMF as a response to the SM policy association request (in operation 9.2).

[0124] In operation 10, the H-SMF may establish a connection between the H-UPF and the V-UPF 1. That is, the H-SMF may perform an N4 session establishment procedure to establish a connection between the H-UPF and the V-UPF 1.

[0125] In operation 11, the H-SMF may send the authorized HR local session AMBR value and the HR local session establishment allowed indicator obtained from the H-PCF in the previous operation to the V-SMF.

[0126] In operation 12, the V-SMF may configure an authorized HR local session AMBR value for V-UPF1. In addition, the V-SMF may also configure an authorized HR local session AMBR value for V-UPF2.

[0127] In operation 13, as a response (Nsmf_PDUSession_CreateSMContext response) to operation 3 (Nsmf_PDUSession_CreateSMContext request), the V-SMF may notify the AMF that the PDU session has been successfully established.

[0128] In operation 14, the AMF may notify the UE that the PDU session has been successfully established (PDU session establishment request).

[0129] Although reference Figures 3 to 5 The provided description describes the case where H-PCF is set and used in the HPLMN, but SMF can perform the operations of H-PCF described in the present disclosure without H-PCF. The present disclosure is not limited to the above example, and another network entity instead of SMF can perform the operations of H-PCF instead.

[0130] In addition, in Figures 3 to 5 After applying the HR local session AMBR described in , the method for reporting information associated with a change in the subscribed HR local session AMBR caused by a change in user information is as follows:

[0131] Method 1 : In the case where the subscribed HR local session AMBR is updated according to the change of user information, UDM can report the updated subscribed HR local session AMBR value to H-SMF. H-SMF can send the updated subscribed HR local session AMBR value to H-PCF, and can obtain a new authorized HR local session AMBR value from H-PCF. The newly generated authorized HR local session AMBR value can be transmitted to V-SMF for application to V-UPF1 and V-UPF2.

[0132] Method 2: In the case where the subscribed HR local session AMBR is updated according to the change of user information, UDM can report the updated subscribed HR local session AMBR value to H-SMF. H-SMF can transmit the updated subscribed HR local session AMBR value to V-SMF, and can perform control so that the value is applied to V-UPF1 and V-UPF2. In addition, in the case where the subscribed HR local session AMBR is reduced, H-SMF can adjust the maximum bit rate value implemented (implemented) in H-UPF.

[0133] Method 3 : In the case where the subscribed HR local session AMBR is updated according to the change of user information, the UDM can report the updated subscribed HR local session AMBR value to the V-SMF. The V-SMF can immediately apply the updated subscribed HR local session AMBR value to the V-UPF. Alternatively, in the case where the updated subscribed HR local session AMBR value is higher than the HR local session AMBR constraint value provided from the VPLMN, the H-SMF can be notified that the subscribed HR local session AMBR is higher than the HR local session AMBR constraint value. In addition, by considering that the HR local session AMBR constraint is lower than the subscribed HR local session AMBR, the H-SMF can adjust the maximum bit rate achieved (implemented) in the H-UPF.

[0134] In addition to methods 1 to 3, you can refer to the following Figure 6 A method is described to perform a HR local session-AMBR update method.

[0135] Figure 6 A scheme for updating the HR local session - AMBR disclosed by the SMF according to an embodiment is shown.

[0136] In operation 1, the SMF may send an HR local session establishment permission indicator and at least one of a UE identifier, a PDU session identifier, a serving PLMN ID (or VPLMN ID) of the UE, an HR local session-AMBR constraint in the serving PLMN ID, an HPLMNID, a subscribed HR local session-AMBR, a DNN, S-NSSAI, and a DNAI (an identifier of an access point of a local part of a data network to which the HR local session is to be connected) to the PCF, and may request relevant policy information. The information sent by the SMF to the PCF may be information obtained from the AMF or the UDM.

[0137] In operation 2, upon receiving the HR local session establishment permission indicator from the SMF, the PCF may request the session-related policy information required to establish the HR local session from the UDR. In this case, the PCF may also provide the UDR with the information previously received from the SMF in operation 1, and may obtain the policy information and user information corresponding to the corresponding information.

[0138] In the case where the PCF does not receive information from the SMF regarding whether to allow the establishment of an HR local session, the PCF may request relevant UE user information or policy information stored in the UDR.

[0139] In operation 3, the UDR may send at least one of information associated with whether to allow establishment of the HR local session and a subscribed HR local session-AMBR to the PCF.

[0140] In operation 4, the PCF may determine the HR local session-AMBR (expressed as authorized HR local session-AMBR) considering the information obtained from the SMF in operation 1 and the information obtained from the UDR in operation 3, and may send it to the SMF as a response to operation 1. The SMF may apply the HR local session-AMBR to the UPF connected to the SMF, or may provide the HR local session AMBR value newly received from the PCF to another connected SMF (e.g., V-SMF), and the SMF receiving the final updated HR local session AMBR value may configure the HR local session AMBR value for the connected UPF (e.g., UPF acting as UL CL or BP).

[0141] In operation 5, the UDM may send to the SMF the subscribed HR local session AMBR value updated according to the change of the user information and at least one of the corresponding PDU session identifier, DNN, S-NSSAI, DNAI or service PLMN ID (VPLMN ID).

[0142] In operation 6, the SMF may send to the PCF an updated subscribed HR local session AMBR value updated according to the change in user information and at least one of the corresponding PDU session identifier, DNN, S-NSSAI, DNAI or service PLMN ID (VPLMN ID) received from the UDM, and may request new SM policy information.

[0143] In operations 7 and 8, the PCF may obtain relevant user information and policy information required to update the SM policy information from the UDR in response to a request received from the SMF.

[0144] In operation 9, the PCF may determine a new HR local session AMBR value considering the subscribed HR local session AMBR value received from the SMF and the information obtained from the UDR, and may provide the new HR local session AMBR to the SMF.

[0145] In operation 10, the SMF may perform the N4 session modification procedure to configure the connected UPF with a new HR local session AMBR value obtained from the PCF. Alternatively, the SMF may provide the HR local session AMBR value newly received from the PCF to another SMF (e.g., V-SMF), and the SMF receiving the final updated HR local session AMBR value may configure the HR local session AMBR value for the connected UPF (e.g., a UPF acting as a ULCL or BP).

[0146] Figure 7 A scheme for updating the HR local session-AMBR published by the PCF according to an embodiment is shown.

[0147] In operation 1, the SMF may send an HR local session establishment permission indicator to the PCF, as well as a UE identifier, a PDU session identifier, a serving PLMN ID (or VPLMN ID) of the UE, an HR local session-AMBR constraint in the serving PLMN ID, an HPLMNID, a subscribed HR local session-AMBR, a DNN, a SNSSAI, and at least one of a DNAI (an identifier of an access point of a local part of a data network to which the HR local session is to be connected), and may request relevant policy information. The information sent by the SMF to the PCF may be information obtained from the AMF, another SMF (e.g., V-SMF), or a UDM.

[0148] In operation 2, upon receiving the HR local session establishment permission indicator from the SMF, the PCF may request the UDR to establish the session-related policy information required for the HR local session. In this case, the PCF may also provide the UDR with the information received from the SMF in operation 1, and may obtain the policy information and user information corresponding to the corresponding information.

[0149] In the case where the PCF does not receive information from the SMF regarding whether to allow the establishment of an HR local session, the PCF may request relevant UE user information or policy information stored in the UDR.

[0150] The PCF can also request a subscription to receive notifications when the information received from the UDR is updated. The PCF can also provide notification target address information to send a subscription request to the UDR.

[0151] In operation 3, the UDR may send information associated with whether to allow the establishment of the HR local session and the subscribed HR local session-AMBR to the PCF. In the case where the PCF requests subscription, the UDR may provide the PCF with a notification identifier or a subscription identifier.

[0152] In operation 4, the PCF may determine the HR Local Session-AMBR (expressed as Authorized HR Local Session-AMBR) considering the information obtained from the SMF in operation 1 and the information obtained from the UDR in operation 3, and may send it to the SMF as a response to operation 1.

[0153] In operation 5, the UDR may send to the PCF the subscribed HR local session AMBR value updated according to the change of the user information and at least one of the corresponding PDU session identifier, DNN, S-NSSAI, DNAI or serving PLMN ID (VPLMN ID).

[0154] In operation 6, the PCF may determine a new HR local session AMBR value in consideration of the updated subscribed HR local session AMBR value received from the UDR.

[0155] In operation 7, the PCF may send the updated HR local session AMBR value to the SMF. In this case, a UE identifier, a PDU session identifier, or at least one of a DNN, S-NSSAI, DNAI, and a service PLMN ID (VPLMN ID) may be provided to provide PDU session information of the PDU session to which the corresponding HR local session AMBR value needs to be applied.

[0156] In operation 8, the SMF may perform the N4 session modification procedure to configure the new HR local session AMBR value obtained from the PCF for the connected UPF. Alternatively, the SMF may provide the HR local session AMBR value newly received from the PCF to another SMF (e.g., V-SMF), and the SMF receiving the final updated HR local session AMBR value may configure the HR local session AMBR value for the connected UPF (e.g., UPF acting as ULCL or BP).

[0157] Figure 8 A block diagram showing the structure of a user equipment (UE) according to an embodiment.

[0158] like Figure 8 As shown, the UE may include a processor 820, a transceiver 800, and a memory 810. However, the component elements of the UE are not limited to the above examples. For example, the UE may include more or fewer component elements than the above component elements. In addition, the processor 820, the transceiver 800, and the memory 810 may be embodied as a single chip.

[0159] The processor 820 may control a series of processes in which the UE operates according to the above-described embodiments. For example, the processor 820 may control the component elements of the UE to implement a method for providing a broadcast service. The processor 820 may control the component elements of the UE to implement a program stored in the memory 810. In addition, the processor 820 may be an application processor (AP), a communication processor (CP), a circuit, a dedicated circuit, or at least one processor.

[0160] The transceiver 800 may perform signal transmission or reception with a network entity, another UE, or a base station. The signal in the signal transmission or reception performed with the network entity, another UE, or a base station may include control information and data. The transceiver 800 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that performs low-noise amplification on the received signal and down-converts the frequency, etc. This is only an example of the transceiver 800, and the component elements of the transceiver 800 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 800 may receive a signal via a wireless channel and output it to the processor 820, and may send a signal output from the processor 820 via a wireless channel.

[0161] The memory 810 may store programs and data required for the UE to operate. In addition, the memory 810 may store control information or data included in a signal sent or received by the UE. The memory 810 may be configured as a storage medium such as a ROM, RAM, hard disk, CD-ROM, DVD, etc., or a combination of storage media. In addition, there may be multiple memories 810. The memory 810 may store a program for implementing the above-mentioned method for providing a broadcast service.

[0162] Fig. 9 A block diagram showing the structure of a base station according to an embodiment.

[0163] like Fig. 9 As shown, the base station may include a transceiver 920, a memory 900, and a processor 910. However, the component elements of the base station are not limited to the above examples. For example, the base station may include more or fewer component elements than the above component elements. In addition, the processor 920, the transceiver 900, and the memory 910 may be embodied as a single chip.

[0164] The processor 920 may control a series of processes for the base station to operate according to the above-described embodiments. For example, the processor 920 may control the component elements of the base station to provide a broadcast service. The processor 920 may control the component elements of the base station to implement the program stored in the memory 910. In addition, the processor 920 may be an AP, a CP, a circuit, a dedicated circuit, or at least one processor.

[0165] The transceiver 900 may perform signal transmission or reception with a network entity, another base station, or a UE. The signal in the signal transmission or reception performed with the network entity, another base station, or a UE may include control information and data. The transceiver 900 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that performs low-noise amplification on the received signal and down-converts the frequency, etc. This is merely an example of the transceiver 900, and the component elements of the transceiver 900 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 900 may receive a signal via a wireless channel and output it to the processor 920, and may send a signal output from the processor 920 via a wireless channel.

[0166] The memory 910 may store programs and data required for the base station to operate. In addition, the memory 910 may store control information or data included in a signal sent or received by the base station. The memory 910 may be configured as a storage medium such as a ROM, RAM, hard disk, CD-ROM, DVD, etc., or a combination of storage media. In addition, there may be a plurality of memories 910. The memory 910 may store a program for implementing the above-mentioned method for providing a broadcast service.

[0167] Fig.10 A block diagram showing the structure of a network entity according to an embodiment.

[0168] like Fig.10 As shown, the network entity of the present disclosure may include a processor 1020, a transceiver 1000, and a memory 1010. However, the component elements of the network entity are not limited to the above examples. For example, the network entity may include more or fewer elements than the above component elements. In addition, the processor 1020, the transceiver 1000, and the memory 1010 may be implemented as a single chip.

[0169] The processor 1020 may control a series of processes in which the NF operates according to the above-described embodiments. For example, the processor 1020 may control the component elements of the network entity to implement a method for providing a broadcast service. The processor 1020 may control the component elements of the NF to implement a program stored in the memory 1010. In addition, the processor 1020 may be an AP, a CP, a circuit, a dedicated circuit, or at least one processor.

[0170] The transceiver 1000 may perform signal transmission or reception with another network entity, a base station, or a UE. The signal in the signal transmission or reception performed with another network entity or a UE may include control information and data. The transceiver 1000 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that performs low-noise amplification on the received signal and down-converts the frequency, etc. This is only an example of the transceiver 1000, and the component elements of the transceiver 1000 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 1000 may receive a signal via a wireless channel and output it to the processor 1020, and may send a signal output from the processor 1020 via a wireless channel.

[0171] The memory 1010 may store programs and data required for the network entity to operate. In addition, the memory 1010 may store control information or data included in a signal sent or received by the network entity. The memory 1010 may be configured as a storage medium such as a ROM, RAM, hard disk, CD-ROM, DVD, etc., or a combination of storage media. In addition, there may be multiple memories 1010. The memory 1010 may store a program for implementing the above-mentioned method for providing a broadcast service.

[0172] The methods according to various embodiments described in the claims or the specification may be implemented by hardware, software, or a combination of hardware and software.

[0173] For software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium may be configured to be executed by one or more processors of an electronic device. One or more programs may include instructions for controlling an electronic device to perform a method according to an embodiment described herein.

[0174] Such a program (e.g., software module, software) may be stored in a random access memory, a non-volatile memory including flash memory, a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), a magnetic disk storage device, a compact disk (CD)-ROM, a digital versatile disk (DVD) or other optical storage device, and a magnetic tape cassette. Alternatively, it may be stored in a memory combining part or all of those recording media. Multiple memories may be included.

[0175] In addition, the program may be stored in an attachable storage device accessible via a communication network (such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN)) or a communication network that combines these networks). Such a storage device may access the device that performs the embodiments of the present disclosure through an external port. In addition, a separate storage device on a communication network may access the device that performs the embodiments.

[0176] In the specific embodiments of the present disclosure, components are expressed in singular or plural form. However, for ease of explanation, singular or plural expression is appropriately selected according to a certain situation, and the present disclosure is not limited to a single component or multiple components. A component expressed in plural form can be configured as a single component, and a component expressed in singular form can be configured as multiple components.

[0177] Meanwhile, although specific embodiments have been described herein, it should be noted that various changes may be made thereto without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure is not limited or defined by the embodiments, and is not limited only by the scope of the following claims, but also by their equivalents.

[0178] The embodiments of the present disclosure described and shown in the specification and the drawings are merely specific examples that have been presented to easily explain the technical content of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical ideas of the present disclosure can be implemented. In addition, as needed, the above-mentioned corresponding embodiments can be used in combination. For example, a part of an embodiment of the present disclosure can be combined with a part of another embodiment to operate a base station and a terminal. As an example, a part of an embodiment can be combined with a part of a second embodiment to operate a base station and a terminal. In addition, although the above-mentioned embodiments have been presented based on a frequency division duplex (FDD) LTE system, other variations based on the technical ideas of the above-mentioned embodiments can also be implemented in other systems such as time division duplex (TDD) LTE, 5G or NR systems.

[0179] In the drawings describing the methods of the present disclosure, the order of description does not always correspond to the order of performing the steps of each method, and the sequential relationship between the steps may be changed or the steps may be performed in parallel.

[0180] Alternatively, in the drawings describing the method of the present disclosure, some elements may be omitted, and only some elements may be included therein without departing from the basic spirit and scope of the present disclosure.

[0181] Furthermore, in the method of the present disclosure, some or all of the contents of each embodiment may be implemented in combination without departing from the essential spirit and scope of the present disclosure.

[0182] Various embodiments of the present disclosure have been described above. The above description is for illustrative purposes only, and the embodiments of the present disclosure are not limited to the embodiments set forth herein. It will be understood by those skilled in the art that the present disclosure can be easily modified and changed into other specific forms without departing from the technical ideas or basic features of the present disclosure. Therefore, the scope of the present disclosure should not be determined by the above detailed description, but by the appended claims, and all modifications and changes derived from the meaning and scope of the claims and their equivalents should be interpreted as falling within the scope of the present disclosure.

[0183] While the present disclosure has been particularly shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a first session management function (SMF) entity, the method comprising: receiving, from the second SMF entity, a request message for a protocol data unit (PDU) session associated with a home routing HR local session; receiving information about an aggregate maximum bit rate AMBR for the HR local session from a unified data management (UDM) entity; receiving, from a policy control function PCF entity, an authorized AMBR of the HR local session generated based on information about the AMBR; and Send a response message including the authorized AMBR to the second SMF.

2. The method according to claim 1, in, The first SMF entity is a home-SMF entity included in a home public land mobile network H-PLMN, the home-SMF being the H-SMF, The second SMF entity is a visited-SMF entity included in a visited public land mobile network V-PLMN, the visited-SMF being V-SMF, The PCF entity is a home-PCF included in the H-PLMN, the home-PCF is the H-PCF, and The HR local session is a session in the local area of ​​the data network DN in the V-PLMN.

3. The method according to claim 1, in, The request message includes user information associated with the V-PLMN, and The user information includes the first AMBR of the HR local session and at least one of the following: PLMN identifier ID, data network name DNN, single network slice selection auxiliary information S-NSSAI or data network access identifier DNAI.

4. The method according to claim 3, in, The information about the AMBR includes a second AMBR corresponding to at least one of the PLMNID, the DNN, the S-NSSAI, or the DNAI, or a combination thereof, and The second AMBR is stored in the UDM entity.

5. A method performed by a unified data management (UDM) entity, the method comprising: Receiving information about a protocol data unit (PDU) session from a first session management function (SMF) entity; as well as sending information about an aggregate maximum bit rate AMBR associated with the PDU session to the first SMF entity, wherein an authorized aggregate maximum bit rate AMBR of a home routing HR local session is generated based on information about the AMBR, and Wherein, in response to the request message for the PDU session, the authorized AMBR is sent to the second SMF entity.

6. The method according to claim 5, in, The first SMF entity is a home-SMF entity included in a home public land mobile network H-PLMN, the home-SMF being the H-SMF, The second SMF entity is a visited-SMF entity included in a visited public land mobile network V-PLMN, the visited-SMF being V-SMF, The policy control function PCF entity is a home-PCF included in the H-PLMN, the home-PCF is the H-PCF, and The HR local session is a session in the local area of ​​the data network DN in the V-PLMN.

7. The method according to claim 6, in, The request message includes user information associated with the V-PLMN, and The user information includes the first AMBR of the HR local session and at least one of the following: PLMN identifier ID, data network name DNN, single network slice selection auxiliary information S-NSSAI or data network access identifier DNAI.

8. The method according to claim 7, in, The information about the AMBR includes a second AMBR corresponding to at least one of the PLMNID, the DNN, the S-NSSAI, or the DNAI, or a combination thereof, and The second AMBR is stored in the UDM entity.

9. A first session management function (SMF) entity in a wireless communication system, the first SMF comprising: Transceiver; as well as at least one processor coupled to the transceiver and configured to: receiving, from the second SMF entity, a request message for a protocol data unit (PDU) session associated with a home routing HR local session; receiving information about an aggregate maximum bit rate AMBR for the HR local session from a unified data management (UDM) entity; receiving, from a policy control function PCF entity, an authorized AMBR of the HR local session generated based on information about the AMBR; and Send a response message including the authorized AMBR to the second SMF.

10. The first SMF according to claim 9, in, The first SMF entity is a home-SMF entity included in a home public land mobile network H-PLMN, the home-SMF being the H-SMF, The second SMF entity is a visited-SMF entity included in a visited public land mobile network V-PLMN, the visited-SMF being V-SMF, The PCF entity is a home-PCF included in the H-PLMN, the home-PCF is the H-PCF, and The HR local session is a session in the local area of ​​the data network DN in the V-PLMN.

11. The first SMF according to claim 9, in, The request message includes user information associated with the V-PLMN, and The user information includes the first AMBR of the HR local session and at least one of the following: PLMN identifier ID, data network name DNN, single network slice selection auxiliary information S-NSSAI or data network access identifier DNAI.

12. The first SMF according to claim 11, in, The information about the AMBR includes a second AMBR corresponding to at least one of the PLMNID, the DNN, the S-NSSAI, or the DNAI, or a combination thereof, and The second AMBR is stored in the UDM entity.

13. A unified data management (UDM) entity in a wireless communication system, the UDM entity comprising: Transceiver; as well as at least one processor coupled to the transceiver and configured to: Receiving information about a protocol data unit (PDU) session from a first session management function (SMF) entity; as well as sending information about an aggregate maximum bit rate AMBR associated with the PDU session to the first SMF entity, wherein an authorized AMBR of a home routing HR local session is generated based on information about the AMBR, and Wherein, in response to the request message for the PDU session, the authorized AMBR is sent to the second SMF entity.

14. The UDM entity according to claim 13, in, The first SMF entity is a home-SMF entity included in a home public land mobile network H-PLMN, the home-SMF being the H-SMF, The second SMF entity is a visited-SMF entity included in a visited public land mobile network V-PLMN, the visited-SMF being V-SMF, The policy control function PCF entity is a home-PCF included in the H-PLMN, the home-PCF is the H-PCF, and The HR local session is a session in the local area of ​​the data network DN in the V-PLMN.

15. The UDM entity according to claim 13, in, The request message includes user information associated with the V-PLMN, and The user information includes the first AMBR of the HR local session and at least one of the following: PLMN identifier ID, data network name DNN, single network slice selection auxiliary information S-NSSAI or data network access identifier DNAI.

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