Method and apparatus for data transmission and reception management in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate than a 4G communication system, such as LTE. A base station according to one embodiment of the present disclosure may: receive, from a core network entity, a first message including PDU set QoS parameters; determine whether one or more QoS flows satisfy the PDU set QoS parameters; and, if it is determined that one or more QoS flows do not satisfy the PDU set QoS parameters, transmit a second message including information indicating that PDU set handling for the QoS flows is not applied to the core network entity, on the basis of a local policy for PDU set-based admission control of the base station.

Description

Method and device for managing data transmission and reception in a wireless communication system

[0001] The present disclosure relates to a method and device for managing data transmission and reception in a wireless communication system. Specifically, the present disclosure relates to a method and device for smoothly managing data transmission and reception according to the status of a base station when supporting application-level QoS (Quality of Service) in a wireless communication system.

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

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

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

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

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

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

[0008] In a wireless communication system according to one embodiment, a method of a base station is provided. The method of the base station may include receiving, from a core network entity, a first message including Protocol Data Unit (PDU) Set Quality of Service (QoS) parameters. The method of the base station may include determining whether one or more QoS flows satisfy the PDU Set QoS parameters. If the method of the base station determines that one or more QoS flows do not satisfy the PDU Set QoS parameters, the method of the base station may include transmitting, to the core network entity, a second message including information indicating that PDU Set handling for the QoS flow is not applied based on a local policy of the base station regarding PDU set based admission control.

[0009] A method of a base station according to one embodiment may further include the step of transmitting, to an AF (Application Function), a second message including information indicating that PDU Set handling for a QoS flow is not applied through a core network.

[0010] According to one embodiment, information indicating that PDU Set handling is not applied to a QoS flow may include an ID of the QoS flow and indicate that PDU Set handling is not applied per QoS flow.

[0011] The method of the base station according to one embodiment may further include the step of receiving, from the core network entity, a third message including a PDU set based admission control policy. The method of the base station may further include the step of transmitting, to the core network entity, a fourth message including modified PDU Set QoS parameters based on the received PDU set based admission control policy, if it is determined that one or more QoS flows do not satisfy the PDU Set QoS parameters.

[0012] The method of the base station according to one embodiment may further include the step of receiving, from the core network entity, a third message including a PDU set based admission control policy. The method of the base station may further include the step of transmitting, to the core network entity, a fifth message including information indicating that the one or more QoS flows are rejected based on the received PDU set based admission control policy, if it is determined that one or more QoS flows do not satisfy the PDU set QoS parameters.

[0013] According to one embodiment, the information indicating rejection of one or more QoS flows may be list information including IDs of one or more QoS flows rejected by the base station.

[0014] The method of the base station according to one embodiment may further include the step of receiving, from the core network entity, a third message including a PDU set based admission control policy. The method of the base station may further include the step of transmitting, to the core network entity based on the received PDU set based admission control policy, a sixth message including information indicating that PDU Set handling is not applied to the QoS flow, if it is determined that one or more QoS flows do not satisfy the PDU Set QoS parameters.

[0015] In a wireless communication system according to one embodiment, a method of a core network entity is provided. The method of the core network entity may include the step of transmitting, to a base station, a first message including a PDU Set QoS parameter. The method of the core network entity may include the step of receiving, from the base station, a second message including information indicating that PDU Set handling is not applied to the QoS flow based on a PDU set based admission control policy, if the QoS flow does not satisfy the PDU Set QoS parameter. The method of the core network entity may include the step of transmitting, to an Application Function (AF), a third message including information indicating that PDU Set handling is not applied to the QoS flow.

[0016] In a wireless communication system according to one embodiment, a base station is provided. The base station may include a memory including one or more instructions; and at least one processor. The at least one processor may receive, from a core network entity, a first message including Protocol Data Unit (PDU) Set Quality of Service (QoS) parameters by executing one or more instructions stored in the memory. The at least one processor may determine, by executing one or more instructions stored in the memory, whether one or more QoS flows satisfy the PDU Set QoS parameters. If the at least one processor determines, by executing one or more instructions stored in the memory, that one or more QoS flows do not satisfy the PDU Set QoS parameters, the at least one processor may transmit, to the core network entity, a second message including information indicating that PDU Set handling for the QoS flow is not applied based on a local policy of the base station regarding PDU set-based admission control.

[0017] According to one embodiment, at least one processor may transmit, to an Application Function (AF), a second message including information indicating that PDU Set handling for a QoS flow is not to be applied, through the core network, by further executing one or more instructions stored in a memory.

[0018] According to one embodiment, information indicating that PDU Set handling is not applied to a QoS flow may include an ID of the QoS flow and indicate that PDU Set handling is not applied per QoS flow.

[0019] According to one embodiment, the at least one processor may further execute one or more instructions stored in the memory to receive, from the core network entity, a third message including a PDU set based admission control policy. The at least one processor may further execute one or more instructions stored in the memory to transmit, to the core network entity, a fourth message including modified PDU Set QoS parameters based on the received PDU set based admission control policy, if it is determined that one or more QoS flows do not satisfy the PDU Set QoS parameters.

[0020] According to one embodiment, the at least one processor may further execute one or more instructions stored in the memory to receive, from the core network entity, a third message including a PDU set based admission control policy. The at least one processor may further execute one or more instructions stored in the memory to transmit, to the core network entity, a fifth message including information indicating that the one or more QoS flows are rejected based on the received PDU set based admission control policy, if the one or more QoS flows are determined to not satisfy the PDU set QoS parameters.

[0021] According to one embodiment, the at least one processor may further execute one or more instructions stored in a memory to receive, from the core network entity, a third message including a PDU set based admission control policy. The at least one processor may further execute one or more instructions stored in the memory to, when determining that one or more QoS flows do not satisfy the PDU Set QoS parameters, transmit, to the core network entity, a sixth message including information indicating that PDU Set handling is not to be applied to the QoS flow based on the received PDU set based admission control policy.

[0022] In a wireless communication system according to one embodiment, a core network entity is provided. The core network entity may include a memory including one or more instructions; and at least one processor. The at least one processor may transmit a first message including a Protocol Data Unit (PDU) Set Quality of Service (QoS) parameter to a base station by executing the one or more instructions stored in the memory. The at least one processor may receive a second message including information indicating that PDU Set handling is not applied to the QoS flow based on a PDU set-based admission control policy, from the base station, by executing the one or more instructions stored in the memory, if the QoS flow does not satisfy the PDU Set QoS parameter. The at least one processor may transmit a third message including information indicating that PDU Set handling is not applied to the QoS flow to an Application Function (AF) by executing the one or more instructions stored in the memory.

[0023] FIG. 1 is a diagram illustrating an example of a control message path for transmitting data traffic in a wireless communication system according to an embodiment of the present disclosure.

[0024] FIG. 2 is a flowchart illustrating a method for applying QOS by considering the characteristics of data traffic of an application when generating a PDU SESSION for transmitting data traffic in a wireless communication system according to an embodiment of the present disclosure.

[0025] FIG. 3 is a flowchart illustrating a method for providing only QOS FLOWs that a base station can support by taking into account the characteristics of the data traffic of an application when generating a PDU SESSION for transmitting data traffic in a wireless communication system according to an embodiment of the present disclosure.

[0026] FIG. 4 is a flowchart illustrating a method for providing QOS FLOW service by considering the characteristics of data traffic of an application only when a base station can support it when generating a PDU SESSION for transmission of data traffic in a wireless communication system according to an embodiment of the present disclosure.

[0027] FIG. 5 is a flowchart illustrating a method for applying QOS by considering the characteristics of data traffic of an application when generating a PDU SESSION for transmitting data traffic in a wireless communication system according to an embodiment of the present disclosure.

[0028] FIG. 6A and FIG. 6B are flowcharts illustrating a method for notifying an application server when information on the characteristics of data traffic of an application is received from an application server in a wireless communication system according to an embodiment of the present disclosure but cannot be supported by a base station.

[0029] FIG. 7 is a block diagram of a network entity according to one embodiment of the present disclosure.

[0030] FIG. 8 is a block diagram of a base station according to one embodiment of the present disclosure.

[0031] The operating principles of the present disclosure are described in detail below with reference to the attached drawings. In the following description of the present disclosure, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0032] For the same reason, some components in the attached drawings are omitted or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0033] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the present disclosure is complete and to fully inform those skilled in the art 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.

[0034] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0035] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0036] The term '~part' used in this embodiment means a software or hardware component, and the '~part' performs certain roles. However, the '~part' is not limited to software or hardware. The '~part' may be configured to reside on an addressable storage medium and may be configured to regenerate one or more processors. Thus, as an example, the '~part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and '~parts' may be combined into a smaller number of components and '~parts' or further separated into additional components and '~parts'. In addition, the components and '~parts' may be implemented to regenerate one or more CPUs within a device or a secure multimedia card. Additionally, in the embodiment, '~bu' may include one or more processors.

[0037] In the present disclosure, a 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.

[0038] Furthermore, the embodiments of the present disclosure may be applied to other communication systems having similar technical backgrounds or channel types to those described below. Furthermore, the embodiments of the present disclosure may be applied to other communication systems with some modifications, as determined by a person skilled in the art, without significantly departing from the scope of the present disclosure.

[0039] In specifically describing the embodiments of the present disclosure, the communication system may utilize various wired or wireless communication systems, for example, the 3GPP, a wireless communication standard standardization organization, may utilize the New RAN (NR), which is a wireless access network in the 5G communication standard, and the Packet Core (5G System, or 5G Core Network, or NG Core: Next Generation Core), which is a core network. In addition, it may be applied to other communication systems with similar technical backgrounds with slight modifications within a range that does not significantly deviate from the scope of the present disclosure, and this will be possible at the discretion of a person skilled in the art of the present disclosure.

[0040] The terms used in the description of the present disclosure below to identify connection nodes, terms referring to network entities (NFs), terms referring to messages, terms referring to interfaces between NFs (Network Functions), terms referring to various identification information, etc. are provided as examples for convenience of explanation. Therefore, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0041] 5G systems support network slicing, and traffic for different network slices can be processed by different protocol data unit (PDU) sessions. The PDU session may represent an association between a terminal and a data network providing PDU connection services.

[0042] The above network slice can be understood as a technology that logically configures a network as a set of network functions (NF) to support various services with different characteristics, such as broadband communication services, massive IoT, V2X, and mission-critical services, and separates different network slices. Therefore, even if a communication failure occurs in a network slice, the communication in other network slices is not affected, so that stable communication services can be provided. In the present disclosure, “slice” may be used interchangeably as a term meaning “network slice.” In such a network environment, a terminal can connect to multiple network slices when receiving various services. In addition, the 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.

[0043] A mobile communication operator can configure the above network slices and allocate network resources suitable for specific services for each network slice or for each set of network slices. The above network resources may refer to NFs, logical resources provided by the NF, or wireless resource allocation of a base station.

[0044] For example, a mobile operator may configure network slice A to provide mobile broadband services, network slice B to provide vehicle communication services, and network slice C to provide XR services, which will be described later.

[0045] In other words, in a 5G network, each service can be efficiently provided to terminals through network slices specialized for its characteristics. In a 5G system, a network slice can be represented as Single-Network Slice Selection Assistance Information (S-NSSAI). The S-NSSAI can include an Slice / Service Type (SST) value and a Slice Differentiator (SD) value.

[0046] The above SST may indicate the characteristics of a service supported by a network slice (e.g., enhanced mobile broadband (eMBB), IoT, ultra reliability low latency communication (URLLC), V2X, XR services, etc.). The above SD may be a value used as an additional identifier for a specific service referred to as the SST.

[0047] Services that require services characterized by high transmission speed and low latency (HDRLL; High Data Rate Low Latency) include, for example, extended reality (XR) services, augmented reality (AR) services, virtual reality (VR) services, or cloud gaming services. The VR service is a service that provides a virtual environment implemented by a computer device using a VR headset, etc. The AR service is a service that can combine a virtual environment with the real world using location, geographic information, etc. The XR service is a service that can not only combine a real environment and a virtual environment, but also provide the user with information such as touch, hearing, and smell, thereby enhancing the user's sense of experience.

[0048] The purpose of the present disclosure is to provide a method and device for smoothly managing data transmission by reflecting the status of a base station when using QoS that reflects application-level characteristics to improve the user's perceived performance when using a service characterized by ultra-high-speed, low-latency communication, such as an XR service, in a wireless communication system.

[0049] In this disclosure, the communication service providing the application-based QoS is described based on XR service for convenience. However, this disclosure is applicable not only to XR service but also to various data services. Therefore, it should be noted that the embodiments of this disclosure are not limited to XR service.

[0050] In one example of the present disclosure, when various types of XR service data, such as audio, video, and haptic, are transmitted to a user, packets belonging to a specific Application Data Unit (ADU) of the application must be transmitted to the terminal according to the characteristics of the application so that the information can be meaningful to the user.

[0051] If transmission of some packets belonging to a specific ADU fails, even if the packets belonging to that application are transmitted to the terminal, the user may not be able to see the ADUs belonging to that application. In this case, if the network does not transmit these packets that are not visible to the user, resources for unnecessary packet transmission can be saved, which can improve network performance.

[0052] Additionally, ADUs are created according to the characteristics of the application to serve the user, and when packets belonging to each ADU are transmitted through a communication network, each ADU may have a correlation with each other according to the characteristics of the application.

[0053] For example, in the case of a specific ADU, it contains information that is very important and absolutely necessary when transmitting information to the user. For example, in the case of a certain ADU, even if packets belonging to the ADU are transmitted to the terminal without the important specific ADU, they cannot be displayed to the user. In this way = the relationship between different ADUs and the importance of each ADU can be determined.

[0054] For example, when packets belonging to a certain ADU are transmitted, packets of ADUs with lower importance and higher relationship than the ADU mentioned above can be scheduled with a lower priority in scheduling and packet processing, or, if necessary, packets belonging to the ADU can be discarded. As above, when processing packets using application-level information, network resources can be efficiently used, thereby improving the user's service experience.

[0055] In this disclosure, ADU can be viewed as a collection of PDUs (packet data units) in a communications network, and thus can be referred to as a PDU set. In describing this disclosure, the terms ADU and PDU set may be used interchangeably, but are fundamentally understood as the same concept. However, ADU can be viewed as a unit of application traffic data transmitted outside of a communications network, and when ADU is serviced within a communications network, it can be referred to as a PDU set.

[0056] Packets corresponding to a PDU Set are processed for QoS based on the QoS parameters given at the existing PDU level when serviced on a communication network. For example, QoS parameters include information such as PDB (Packet Delay Budget) or PER (Packet Error Rate).

[0057] At this time, when application-level QoS processing, that is, PDU Set QoS parameters given at the PDU Set level, are supplied from PCF (policy and charge function) or AF (application function), QoS can be processed based on the PDU Set QoS parameters if PDU Set QoS parameters corresponding to the QoS parameters are given.

[0058] For example, even if PDB is given as a QoS parameter for a QoS Flow, if PSDB is given, the base station can schedule and service the data of the QoS flow so as to satisfy PSDB instead of PDB. Or, even if PER is given as a QoS parameter for a QoS Flow, if PSER is given, the base station can schedule and service the data of the QoS flow so as to satisfy PSER instead of PER.

[0059] In addition, in order to perform QoS processing at the PDU Set level in a communication network, for downlink data, PDU Set information is found from the PSA (PDU Session Anchor) UPF of the communication network, and by forwarding the PDU Set information by including it in the GTP-U header, QoS processing can be performed according to the PDU Set QoS parameters within the communication network (e.g., base station, etc.).

[0060] FIG. 1 is a diagram illustrating an example of a control message path for transmitting data traffic in a wireless communication system according to one embodiment of the present disclosure.

[0061] The example of FIG. 1 roughly shows a signaling path for control, such as when an application server (AF) transmits service requirements (e.g., PDU Set QoS Parameters) for XR data traffic according to an XR service used by a user in a wireless communication system, and applies traffic based on PDU Set QoS, modifies the values ​​of applied PDU Set QoS parameters, or takes actions such as not accepting corresponding QoS flows, depending on the situation of a Next Generation-Radio Access Network (NG-RAN) node or a User Plane Function (UPF), and notifies the application server (AF) of changes in processing of corresponding service traffic in the wireless communication system when necessary.

[0062] In the present disclosure, the network technology may refer to standard specifications defined by the International Telecommunication Union (ITU) or 3GPP (e.g., TS 23.501, TS 23.502, TS 23.503, etc.), and the components included in the network structure of Fig. 1 may each mean a physical entity, or may mean software or hardware combined with software that performs an individual function. In the drawings, reference symbols shown as Nx, such as N1, N2, N3, ..., represent known interfaces between NFs in a 5G core network (CN), and since a related description may refer to the standard specification (TS 23.501), a detailed description thereof will be omitted. In addition, since a basic related description of the handover procedure may refer to the standard specification (TS 23.502 or TS 38.300), a detailed description of the handover procedure in the present disclosure may be omitted as necessary.

[0063] Referring to FIG. 1, a wireless communication system according to an embodiment of the present disclosure includes a radio access network (NG-RAN) and a 5G core network (5GC). The NG-RAN may be a base station (e.g., gNB, IAB (Integrated Access and Backhaul), etc.) that supports a radio access technology in a 5G system. The NG-RAN may or may not provide PDU Set QoS, and may have limitations on the values ​​of PDU Set QoS parameters that can be provided depending on the resource processing status of the base station. In addition, when the NG-RAN does not support PDU Set, it may or may not perform a function of finding out PDU Set information from PSA UPF. The PDU Set QoS parameter may include at least one of a PDU Set Delay Budget (PSDB), a PDU Set Error Rate (PSER), or a PDU Set Integrated Handling Indicator (PSIHI).

[0064] In Fig. 1, 5GC may include network entities such as AMF (Access and Mobility Management Function), SMF (Session Management Function), UPF (User Plane Function), PCF (Policy Control Function), NEF (Network Exposure Function), UDM (Unified Data Management) (not shown).

[0065] The AMF is an entity that manages terminal access and mobility. The AMF can serve as a terminal-core network endpoint, connecting terminals to other entities in the 5GC via NG-RAN. For example, the AMF can perform network functions such as terminal registration, connection, reachability, mobility management, access verification, authentication, and mobility event generation.

[0066] The SMF can perform management functions for the terminal's Protocol Data Unit (PDU) sessions. For example, the SMF can perform network functions such as session management through session establishment, modification, and termination, as well as tunnel maintenance between the UPF and NG-RAN required for this purpose; terminal IP (Internet Protocol) address allocation and management; user plane selection and control; UPF traffic processing control; and charging data collection control.

[0067] The UPF handles user data (e.g., XR data) of the terminal, and can handle XR data so that it can transmit XR data generated by the terminal to the AF / AS or transmit data received from the AF / AS to the terminal. For example, the UPF can perform network functions such as acting as an anchor between radio access technologies (RATs), providing connections between PDU sessions and AF / AS, routing and forwarding packets, inspecting packets, applying user plane policies, creating traffic usage reports, and buffering.

[0068] UDM can perform functions such as generating authentication information for 3GPP security, processing user identifiers (User IDs), managing a list of network functions (NFs) supporting terminals, and managing subscription information. UDR (Unified Data Repository) can perform functions such as storing and providing subscription information managed by the UDM, structured data for exposure, NEF (Network Exposure Function), or application data associated with services.

[0069] The PCF is an NF that manages operator policy information for providing services in 5G systems. The UDR stores terminal subscription information and can provide this information to the UDM. Furthermore, the UDR can store operator policy information and provide it to the PCF.

[0070] The NEF can be responsible for externally transmitting or receiving events occurring in the 5G system and the capabilities it supports. For example, the NEF can securely supply AF / AS information to the 5GC, convert internal / external information, and store and redistribute information received from other NFs in the UDR.

[0071] A terminal can connect to the NG-RAN and register with the 5G system. For example, a terminal can connect to the NG-RAN and perform a terminal registration procedure with the AMF. During the registration procedure, the AMF can determine a network slice available to the terminal connected to the NG-RAN and allocate it to the terminal. The terminal can select a network slice and establish a PDU session for communication with the AF / AS. One PDU session can include one or more Quality of Service (QoS) Flows, and each QoS Flow can provide different transmission performance required for each application service by setting different QoS parameters. In addition, through handover, data forwarding from the serving NG-RAN to the target NG-RAN and data traffic forwarded from the UPF to the target NG-RAN for QoS flows for which service is allowed in the target NG-RAN are scheduled and transmitted to the terminal according to the received QoS profile or QoS parameters. In particular, when PDU Set QoS parameters are provided for the above QoS flow and QoS handling for PDU Set is performed, the method proposed in this document determines values ​​for data forwarding or PDU set-based QoS handling so that the service can be provided smoothly even during handover.

[0072] Additionally, the application server (AF) can transmit the values ​​of the PDU Set QoS parameters required for the corresponding service to the communication network. In this case, if the AF is outside the trusted domain, the PDU Set QoS parameters values ​​can be transmitted to the PCF through the NEF, and if the AF is within the trusted domain, the PDU Set QoS parameters values ​​can be directly transmitted to the PCF, thereby applying PDU Set-based handling as described above.

[0073] FIG. 2 is a flowchart illustrating a method for applying QOS by considering the characteristics of data traffic of an application when generating a PDU SESSION for transmitting data traffic in a wireless communication system according to an embodiment of the present disclosure.

[0074] Referring to FIG. 2, in step 1, when requesting AMF to create a PDU Session for an XR service, the terminal (UE) may transmit a PDU Session establishment request message including S-NSSAI or DNN information dedicated to the XR service.

[0075] In steps 2 and 3, the AMF can send a PDU Session establishment request message to the SMF, and the SMF can send a response to the AMF.

[0076] In steps 4 and 5, the SMF may send a Session Management (SM) Policy Association request message to the PCF, and the PCF may send a SM policy association response message to the SMF, which includes the SM policy for the XR-specific S-NSSAI and the DNN.

[0077] An SM policy may not only include QoS parameter values ​​for a QoS flow, but may also include values ​​for PDU Set QoS parameters to apply a PDU Set to the QoS flow.

[0078] In one embodiment, the PCF may additionally convey to the SMF an indication to apply PDU Set-based admission control in the SM policy association response message. The PDU Set QoS parameter may include at least one of a PDU Set Delay Budget (PSDB), a PDU Set Error Rate (PSER), or a PDU Set Integrated Handling Indicator (PSIHI).

[0079] In one embodiment, when PDU Set based Admission Control_partial accept, which is an indication to apply PDU Set based admission control, is included in the SM policy association response message, the SM policy may mean a policy to perform admission control based on PDU Set QoS Parameter values ​​instead of admission control based on QoS Parameters, but to modify and propose modified PDU Set QoS Parameter values ​​that the NG-RAN can satisfy when it is difficult to satisfy the PDU Set QoS Parameter values, and to notify the 5G core of the modified PDU Set QoS Parameter values.

[0080] Meanwhile, after receiving the SM policy association response message, the SMF can create a PDU Session accordingly and create a QoS flow that applies the PDU Set QoS parameters and policy.

[0081] In steps 7 and 8, the SMF may include information for servicing packets to the NG-RAN in the N2 SM Container and forward it to the NG-RAN through the AMF. The information for servicing packets may include QoS parameters and PDU Set QoS parameters that must be satisfied for the QoS flow, including QoS profiles, and may also include an indication that the NG-RAN supports PDU Set handling and applies PDU Set-based admission control when applying PDU Set QoS parameters instead of QoS parameters.

[0082] In step 9, the NG-RAN can determine whether the received QoS flow can sufficiently satisfy the PDU Set QoS parameters through signaling with the terminal, etc.

[0083] If the NG-RAN recognizes / identifies / determines that it is difficult to satisfy the PDU Set QoS parameters, in steps 10 and 11, the NG-RAN may transmit a message to the SMF via the AMF, indicating that the NG-RAN has the capability to support PDU Set based handling, and including modified PDU Set QoS Parameter values ​​that the NG-RAN can satisfy.

[0084] In one embodiment, the indication that there is a capability to support PDU Set-based handling may be notified on a per-QoS flow basis or on a per-PDU session basis regardless of the QoS flow. In one embodiment, modified PDU Set QoS Parameter values ​​may be notified on a per-QoS flow basis to which PDU Set handling is applied.

[0085] In step 14, the SMF that has received the modified PDU Set QoS parameter value can inform the PCF of the modified PDU Set QoS parameter value through SM Policy association modification. Accordingly, the PCF can recognize the situation of the value to which the PDU Set QoS parameter is applied for the QoS flow, and can perform PDU Session modification by additionally modifying the PDU Set QoS parameter values ​​as needed.

[0086] FIG. 3 is a flowchart illustrating a method for providing only QOS FLOWs that a base station can support by taking into account the characteristics of the data traffic of an application when generating a PDU SESSION for transmitting data traffic in a wireless communication system according to one embodiment of the present disclosure.

[0087] Referring to FIG. 3, in step 1, when a terminal (UE) requests AMF to create a PDU Session for an XR service, it may transmit a PDU Session establishment request message including S-NSSAI or DNN information dedicated to the XR service.

[0088] In steps 2 and 3, the AMF can send a PDU Session establishment request message to the SMF, and the SMF can send a response to the AMF.

[0089] In steps 4 and 5, the SMF may send a Session Management (SM) Policy Association request message to the PCF, and the PCF may send a SM policy association response message to the SMF containing the SM policy for the XR-specific S-NSSAI and the DNN.

[0090] An SM policy may not only include QoS parameter values ​​for a QoS flow, but may also include values ​​of PDU Set QoS parameters to apply a PDU Set to the QoS flow.

[0091] In one embodiment, the PCF may additionally convey to the SMF an indication to apply PDU Set-based admission control in the SM policy association response message. The PDU Set QoS parameter may include at least one of a PDU Set Delay Budget (PSDB), a PDU Set Error Rate (PSER), or a PDU Set Integrated Handling Indicator (PSIHI).

[0092] In one embodiment, when the PDU set based Admission Control_Qos flow level, which is an indication to apply admission control based on PDU Set, is included in the SM policy association response message, the SM Policy may mean a policy that, instead of admission control based on QoS Parameter, admission control is performed based on PDU Set QoS Parameter values, but when it is difficult for the NG-RAN to satisfy the PDU Set QoS Parameter values, the NG-RAN can reject establishment of a QoS flow that cannot be satisfied and notify the 5G core of the rejection.

[0093] Meanwhile, after receiving the SM policy association response message, the SMF can create a PDU Session accordingly and create a QoS flow that applies the PDU Set QoS parameters and policy.

[0094] In steps 7 and 8, the SMF may include information for servicing packets in the N2 SM Container and forward it to the NG-RAN through the AMF. The information for servicing packets may include QoS parameters and PDU Set QoS parameters that must be satisfied for the QoS flow, including QoS profiles, and may also include an indication that the NG-RAN supports PDU Set handling and applies PDU Set-based admission control when applying PDU Set QoS parameters instead of QoS parameters.

[0095] In step 9, the NG-RAN can determine whether the received QoS flow can sufficiently satisfy the PDU Set QoS parameters through signaling with the terminal, etc.

[0096] If the NG-RAN recognizes / identifies / determines that it is difficult to satisfy the PDU Set QoS parameters, it may reject the QoS flow. Accordingly, in step 10, the NG-RAN may transmit a message to the SMF via the AMF, including an indication that the NG-RAN has the capability to support PDU Set-based handling and an indication that the NG-RAN rejects the QoS flow.

[0097] In one embodiment, the indication indicating the presence of a capability to support PDU Set-based handling may be notified on a per-QoS flow basis or on a per-PDU session basis regardless of the QoS flow. In one embodiment, the indication indicating rejection of a QoS flow may be notified on a per-QoS flow basis by including the QoS flow ID.

[0098] In one embodiment, the NG-RAN may indicate rejection by sending the message of step 10 including a list of QoS Flow IDs of QoS flows that the NG-RAN has rejected or by excluding the IDs of the rejected QoS flows from the list of QoS flow IDs of QoS flows that the NG-RAN has permitted.

[0099] In step 14, the SMF that received the Indication can notify the PCF that the QoS flow has been rejected through SM Policy association modification. Accordingly, the PCF can perform PDU Session modification by modifying the PDU Set QoS parameter values ​​for the QoS flow as needed.

[0100] FIG. 4 is a flowchart illustrating a method for providing QOS FLOW service by considering the characteristics of data traffic of an application only when a base station can support it when generating a PDU SESSION for transmission of data traffic in a wireless communication system according to one embodiment of the present disclosure.

[0101] Referring to FIG. 4, in step 1, when requesting AMF to create a PDU Session for an XR service, the terminal (UE) may transmit a PDU Session establishment request message including S-NSSAI or DNN information dedicated to the XR service.

[0102] In steps 2 and 3, the AMF can send a PDU Session establishment request message to the SMF, and the SMF can send a response to the AMF.

[0103] In steps 4 and 5, the SMF can send to the PCF via a Session Management (SM) Policy Association request message, and the PCF can send to the SMF an SM policy association response message containing the SM policy for the XR-specific S-NSSAI and the DNN.

[0104] An SM policy may not only include QoS parameter values ​​for a QoS flow, but may also include values ​​of PDU Set QoS parameters to apply a PDU Set to the QoS flow.

[0105] In one embodiment, the PCF may additionally convey to the SMF an indication to apply PDU Set-based admission control in the SM policy association response message. The PDU Set QoS parameter may include at least one of a PDU Set Delay Budget (PSDB), a PDU Set Error Rate (PSER), or a PDU Set Integrated Handling Indicator (PSIHI).

[0106] In one embodiment, when the PDU set based Admission Control_PDUSet handling level, which is an indication to apply PDU Set based admission control, is included in the SM policy association response message, the SM Policy may mean a policy to apply admission control based on PDU Set QoS Parameter values ​​instead of admission control based on QoS Parameters, but to allow the NG-RAN to not apply PDU Set handling to QoS flows in cases where it is difficult to satisfy the PDU Set QoS Parameter values ​​and to notify the 5G core of the non-application situation.

[0107] Meanwhile, after receiving the SM policy association response message, the SMF can create a PDU Session accordingly and create a QoS flow that applies the PDU Set QoS parameters and policy.

[0108] In steps 7 and 8, the SMF includes information for servicing packets to the NG-RAN in the N2 SM Container and forwards it to the NG-RAN through the AMF. The information for servicing packets may include QoS parameters and PDU Set QoS parameters that must be satisfied for the QoS flow, including QoS profiles, and may also include an indication that the NG-RAN supports PDU Set handling and applies PDU Set-based admission control when applying PDU Set QoS parameters instead of QoS parameters.

[0109] In step 9, the NG-RAN can determine whether the received QoS flow can sufficiently satisfy the PDU Set QoS parameters through signaling with the terminal, etc.

[0110] If the NG-RAN recognizes / identifies / determines that it is difficult to satisfy the PDU Set QoS parameter, the NG-RAN may not apply PDU Set handling to the QoS flow. Accordingly, in step 10, the NG-RAN may transmit a message to the SMF via the AMF, including an indication that the NG-RAN has the capability to support PDU Set based handling and an indication that the NG-RAN does not apply PDU Set handling to the QoS flow, thereby notifying the SMF that PDU Set handling is not applied.

[0111] Alternatively, the NG-RAN may transmit a message to the SMF via the AMF, including an indication that the SMF has the capability to support PDU Set based handling and an indication that the PDU Set QoS parameter for the QoS flow is not satisfied.

[0112] In one embodiment, the indication indicating the presence of a capability to support PDU Set-based handling may be notified on a per-QoS flow basis or on a per-PDU session basis regardless of the QoS flow. In one embodiment, the indication indicating that PDU Set handling is not applicable to the QoS flow may be notified to the SMF on a per-QoS flow basis by including the QoS flow ID.

[0113] In step 14, the SMF that received the Indication can inform the PCF of the situation by including an indication that PDU Set handling is not applied to the QoS flow through SM Policy association modification. Accordingly, the PCF can perform PDU Session modification by modifying the PDU Set QoS parameter values ​​as needed for the QoS flow. In one embodiment, the SMF that received the Indication can inform the NG-RAN or PSA UPF through the PDU Set modification process that PDU Set handling is not applied to the QoS flow.

[0114] FIG. 5 is a flowchart illustrating a method for applying QOS by taking into account the characteristics of data traffic of an application when generating a PDU SESSION for transmission of data traffic in a wireless communication system according to one embodiment of the present disclosure.

[0115] Referring to FIG. 5, in step 1, when requesting AMF to create a PDU Session for an XR service, the terminal (UE) may transmit a PDU Session establishment request message including S-NSSAI or DNN information dedicated to the XR service.

[0116] In steps 2 and 3, AMF can send PDU Session establishment request messages to SMF, and SMF can send a response to AMF.

[0117] In steps 4 and 5, the SMF may send a Session Management (SM) Policy Association request message to the PCF, and the PCF may send a SM policy Association response message to the SMF, which includes the SM policy for the XR-specific S-NSSAI and the DNN.

[0118] An SM policy may not only include QoS parameter values ​​for a QoS flow, but may also include values ​​of PDU Set QoS parameters to apply a PDU Set to the QoS flow.

[0119] In one embodiment, the PCF may additionally convey to the SMF an indication to apply PDU Set-based admission control in the SM policy association response message. The PDU Set QoS parameter may include at least one of a PDU Set Delay Budget (PSDB), a PDU Set Error Rate (PSER), or a PDU Set Integrated Handling Indicator (PSIHI).

[0120] In one embodiment, when an indication to apply PDU Set-based admission control is included in the SM policy association response message, the SM Policy may mean a policy to perform admission control based on PDU Set QoS Parameter values ​​instead of admission control based on QoS Parameters, but to perform admission control based on PDU Set QoS Parameter values ​​in the NG-RAN, and to allow the SMF or the NG-RAN to perform an appropriate PDU Set-based admission control method for the QoS flow according to a local policy when it is difficult to satisfy the PDU Set QoS Parameter values, and to notify the 5G core of the situation regarding the admission control method applied in the NG-RAN.

[0121] In one embodiment, when the PCF additionally includes a PDU Set based Admission Control message, which is an indication to apply PDU Set based admission control, in the SM policy association response message and transmits the message to the SMF, the indication does not indicate a specific PDU Set based admission control scheme, but may indicate that the PDU Set based admission control scheme should be applied. For example, although FIGS. 2 to 4 of the present disclosure describe a scheme in which the PCF transmits a specific indication to the SMF regarding a policy for applying PDU Set based admission control, as another embodiment, even if the PCF does not transmit a specific indication to the SMF, the PCF may instruct the SMF to apply PDU Set based admission control when a PDU Set QoS parameter is transmitted to the SMF.

[0122] Meanwhile, after receiving the SM policy association response message, the SMF can create a PDU Session accordingly and create a QoS flow that applies the PDU Set QoS parameters and policy.

[0123] In steps 7 and 8, the SMF may include information for servicing packets in the N2 SM Container and forward it to the NG-RAN through the AMF. The information for servicing packets may include QoS parameters and PDU Set QoS parameters that must be satisfied for the QoS flow, including QoS profiles, and may also include an indication that the NG-RAN supports PDU Set handling and applies PDU Set-based admission control when applying PDU Set QoS parameters instead of QoS parameters. The indication does not indicate a specific PDU Set-based admission control scheme, but may indicate that the PDU Set-based admission control scheme should be applied.

[0124] For example, if the NG-RAN has the capability to handle PDU Set, when the NG-RAN receives PDU Set QoS parameters from the SMF, it can operate in an appropriate admission control manner according to local policy.

[0125] For example, the SMF may include an indication to the NG-RAN of an appropriate PDU Set-based admission control method so that it can apply an appropriate admission control based on the PDU Set according to local policy. For example, it may include PDU Set-based Admission Control_partial accept as in FIG. 2, PDU Set-based Admission Control_Qos flow level as in FIG. 3, or PDU Set-based Admission Control_PDUSet handling level as in FIG. 4.

[0126] For example, if the NG-RAN has the capability to handle PDU Sets even if the SMF does not include the above indication to the NG-RAN, when the NG-RAN receives the PDU Set QoS parameter from the SMF, it operates in an appropriate admission control manner according to the local policy.

[0127] In step 9, the NG-RAN can determine whether the received QoS flow can sufficiently satisfy the PDU Set QoS parameters through signaling with the terminal, etc.

[0128] If the NG-RAN recognizes / identifies / determines that it is difficult to satisfy the PDU Set QoS parameters, in step 10, the NG-RAN can apply an appropriate admission control method to the QoS flow based on the admission control method received from the SMF or local policy.

[0129] For example, the NG-RAN may, depending on the admission control method applied by the NG-RAN, transmit a message to the SMF via the AMF, including an indication that the NG-RAN has the capability to support PDU Set based handling, and an indication that the NG-RAN has rejected the creation of a QoS flow. Alternatively, the NG-RAN may, depending on the admission control method applied by the NG-RAN, send a message to the SMF via the AMF, including an indication that PDU Set handling is not applicable to the QoS flow, or may inform the SMF of acceptable PDU Set QoS parameter values, including modified PDU Set QoS parameters for the QoS flow.

[0130] That is, the admission control method applied by the NG-RAN through step 10 can be notified to the SMF by including an indication indicating the applied method, such as including PDU Set based Admission Control_partial accept as in FIG. 2, including PDU set based Admission Control_Qos flow level as in FIG. 3, or including PDU set based Admission Control_PDUSet handling level as in FIG. 4.

[0131] In one embodiment, the NG-RAN may include a unified indication, for example, an applied admission control method indication, and may notify the applied admission control method according to the value of the indication. That is, indication = 1 may indicate a method of rejecting QoS flow creation based on PDU Set, indication = 2 may indicate a method of not applying PDU set handling to QoS flow based on PDU Set, indication = 3 may indicate a modified PDU Set QoS parameter value for QoS flow, and indication = 4 may indicate that the received PDU Set QoS parameter for QoS flow is not satisfied. The NG-RAN may notify the 5G network of the applied method through values ​​such as:

[0132] In one embodiment, the indication indicating the presence of a capability to support PDU Set-based handling may be notified on a per-QoS flow basis or on a per-PDU session basis, regardless of the QoS flow. In one embodiment, the indication indicating that admission control is applied based on a PDU Set for a QoS flow may include a QoS flow ID and be notified to the SMF on a per-QoS flow basis.

[0133] In step 14, the SMF that received the Indication can inform the PCF of the situation by including an indication that PDU Set handling is not applied to the QoS flow through SM Policy association modification using the admission control method applied to the PCF. Accordingly, the PCF can perform PDU Session modification by modifying the PDU Set QoS parameter values ​​as needed for the QoS flow.

[0134] In one embodiment, in addition to including an indication indicating that the NG-RAN has the capability to support PDU Set based handling in step 10, the SMF that receives the indication includes an indication indicating that the PDU Set QoS parameter for the QoS flow is not satisfied, and can notify the NG-RAN or PSA UPF through a PDU Set modification process that PDU Set handling is not applied to the QoS flow.

[0135] FIG. 6A and FIG. 6B are flowcharts illustrating a method for notifying an application server (AF) when information on the characteristics of data traffic of an application is received from an application server (AF) in a wireless communication system according to one embodiment of the present disclosure but the base station cannot support it.

[0136] FIG. 6a and FIG. 6b illustrate a method for performing admission control and notifying the application server (AF or AS) of the applied admission control method when it is difficult to satisfy the PDU Set QoS parameters for the QoS flow for the application even if the NG-RAN supports the PDU Set handling function when the application server (AF) provides information on the characteristics of the application data traffic, for example, when PDU Set QoS parameters and Protocol descriptions are provided to the 5G network through NEF.

[0137] Referring to Fig. 6, it can be assumed that a PDU Session is created for the XR service at step 0.

[0138] In step 1, AF can send Nnef_AFSessionWithQoS_Create request message to NEF, which includes PDU Set QoS Parameter and Protocol description, which are service requirement information for data traffic coming from application server, or PDU Set based admission control policy, which indicates that admission control is required based on PDU Set.

[0139] In steps 2 and 3, NEF can authenticate the request and send PDU Set QoS Parameter and Protocol description to PCF via Npcf_PolicyAuthorization_Create request message.

[0140] In steps 4 and 5, NEF may receive response messages for steps 3 and 4 in response thereto.

[0141] Instead of the steps 1 through 5, if the existing service requirements, such as PDU Set QoS Parameters and Protocol descriptions or PDU Set-based admission control policies, require updates, the AF can send the updated information to the NEF via the Nnef_AFSessionWithQoS_Update message. The NEF can send the updated PDU Set QoS Parameters and Protocol description information or the updated PDU Set-based admission control policy to the PCF via the Npcf_PolicyAuthorization_Update process.

[0142] In steps 6 and 7, the PCF that has received and authenticated the above information may transmit an SM policy association modification request message to the SMF, including a PDU Set based admission control policy indicating that PDU Set based admission control is required from the AF according to the application's policy along with the PDU Set QoS parameters value, or, if the PDU Set QoS parameters value is given, a PDU Set based admission control policy indicating that PDU Set based admission control is required according to the 5G network operator's policy. Accordingly, the PDU Session modification procedure may be performed as in steps 6 to 14.

[0143] In one embodiment, the PCF may directly inform the SMF of the admission control method to be used by transmitting information included in a PDU Set based admission control policy, or may directly inform the SMF that PDU Set based admission control is required without specifically informing the SMF of the admission control method to be used, or may indirectly inform the SMF that PDU Set based admission control is required by transmitting PDU Set QoS Parameters without directly sending the PDU Set based admission control policy as described above.

[0144] Therefore, the PDU Set based admission control policy can be delivered by AF as in step 1, or even if the PCF does not receive the PDU Set based admission control policy from the AF, if the PCF receives the PDU Set QoS parameter, the PCF can apply the PDU Set based admission control policy itself according to the operator's policy or local policy.

[0145] Additionally, the PDU Set based admission control policy can be delivered by the PCF as in step 6, or even if the SMF does not receive the PDU Set based admission control policy from the PCF, the SMF can apply the PDU Set based admission control policy itself according to the operator's policy or local policy when the SMF receives the PDU Set QoS parameter.

[0146] In addition, the PDU Set based admission control policy can be delivered by the SMF as in step 9, or even if the NG-RAN does not receive the PDU Set based admission control policy from the SMF, the NG-RAN can apply the PDU Set based admission control policy itself according to the operator's policy or local policy if the NG-RAN receives the PDU Set QoS parameter.

[0147] Accordingly, in case the PDU Set QoS Parameters received from the NG-RAN are not satisfied, such as in step 14 at step 6, admission control is performed based on the PDU Set, and the SMF can recognize a method such as using the modified PDU set QoS parameters according to the admission control method, rejecting the creation of a QoS flow, or rejecting PDU Set handling.

[0148] That is, the SMF can recognize a situation according to the admission control method, such as step 5 to step 13 of FIG. 2, FIG. 3, FIG. 4 or FIG. 5 of the present disclosure, and can notify the PCF of the above situations, such as step 15 or step 16.

[0149] In steps 17 and 18, the PCF can notify the application server (AF) of the status of the QoS flow, and the AF can modify how to process the application data according to the received notification.

[0150] For example, for step 15, the SMF can inform the PCF through an SM policy modification message that the modified PDU set QoS parameter or the creation of the QoS flow is rejected or the PDU Set handling is rejected.

[0151] For example, for step 16, the SMF may notify the PCF that the creation of the modified PDU set QoS parameter or QoS flow is rejected or that PDU Set handling is rejected.

[0152] For example, PCF can notify NEF of the processing status through Npcf_PolicyAuthorization_Notify in step 17, and can notify AF through Nnef_AFSessionWithQoS_Notify in step 18, and AF can modify how to process application data according to the received notification.

[0153] Although FIGS. 6A and 6B of the present disclosure describe a procedure based on PDU Session modification after receiving information for PDU Set QoS from AF in a situation where a PDU Session is previously created, the same can be applied to a procedure for applying PDU Set QoS based on a process of newly creating a PDU Session after receiving information for PDU Set QoS from AF by performing steps 1 to 5 first.

[0154] That is, in a situation where PDU Set QoS parameter information is generated in PCF, the same procedure as in Fig. 2 / Fig. 3 / Fig. 4 / Fig. 5 is performed, and accordingly, for the PDU Set-based admission control method applied, since the PDU Set QoS information is received from AF, the method of notifying AF through the process from step 15 to step 18 can be applied in the same manner.

[0155] FIG. 7 is a block diagram of a network entity (700) according to one embodiment of the present disclosure.

[0156] A network entity (700) according to one embodiment of the present disclosure may include 5GC network entities, for example, Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Network Exposure Function (NEF), Unified Data Management (UDM), etc.

[0157] Referring to FIG. 7, the network entity (700) may be configured with a transceiver (710), a processor (720), and a memory (730). The transceiver (710), the processor (720), and the memory (730) of the network entity (700) may operate according to the methods described above in FIGS. 1 to 6 . However, the components of the network entity (700) are not limited to the examples described above. For example, the network entity (700) may include more or fewer components than the components described above. In one embodiment, the transceiver (710), the processor (720), and the memory (730) may be implemented in the form of a single chip. In addition, the processor (720) may include one or more processors.

[0158] The transceiver (710) is a general term for the receiver of the network entity (700) and the transmitter of the network entity (700), and can transmit and receive signals with a network entity including a UE or an NG-RAN. The signals transmitted and received with the network entity including the UE or the NG-RAN may include control information and data. To this end, the transceiver (710) may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-down-converts a received signal. However, this is only one embodiment of the transceiver (710), and the components of the transceiver (710) are not limited to the RF transmitter and the RF receiver.

[0159] Additionally, the transceiver (710) can perform functions for transmitting and receiving signals via a wireless channel. For example, the transceiver (710) can receive a signal via a wireless channel, output it to the processor (720), and transmit the signal output from the processor (720) via the wireless channel.

[0160] The memory (730) can store programs and data required for the operation of the network entity (700). In addition, the memory (1430) can store control information or data included in a signal acquired from the network entity (700). The memory (730) can be configured as a storage medium or a combination of storage media, such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. In addition, the memory (730) may not exist separately but may be configured as included in the processor (720). The memory (730) can be configured as a volatile memory, a nonvolatile memory, or a combination of volatile and nonvolatile memories. In addition, the memory (730) can provide stored data upon request of the processor (720).

[0161] The processor (720) may control a series of processes so that the network entity (700) can operate according to the embodiments of the present disclosure described above. For example, the processor (720) may receive control signals and data signals through the transceiver (710) and process the received control signals and data signals. The processor (720) may transmit the processed control signals and data signals through the transceiver (710). In addition, the processor (720) may write or read data to or from the memory (730). The processor (720) may perform functions of a protocol stack required by a communication standard. For this purpose, the processor (720) may include at least one processor or microprocessor. In one embodiment, a portion of the transceiver (710) or the processor (720) may be referred to as a communication processor (CP).

[0162] The processor (720) may be composed of one or more processors. In this case, one or more processors may be a general-purpose processor, such as a CPU, AP, or DSP (Digital Signal Processor), a graphics-only processor, such as a GPU or VPU (Vision Processing Unit), or an artificial intelligence-only processor, such as an NPU. For example, if one or more processors are artificial intelligence-only processors, the artificial intelligence-only processor may be designed with a hardware structure specialized for processing a specific artificial intelligence model.

[0163] At least one processor (720) may include various processing circuits and / or multiple processors. For example, the term “processor” as used herein, including in the claims, may include various processing circuits, including at least one processor. One or more processors in the at least one processor may be configured to perform various functions described herein, individually and / or collectively, in a distributed fashion. As used herein, “processor,” “at least one processor,” and “one or more processors” may be configured to perform multiple functions. However, these terms encompass, without limitation, situations where one processor performs some of the functions and other processor(s) perform other parts of the functions, and situations where a single processor may perform all of the functions. Furthermore, the at least one processor may include a combination of processors that perform various of the disclosed functions in a distributed manner. The at least one processor may execute program instructions to achieve or perform various functions.

[0164] FIG. 8 is a block diagram of a base station (800) according to one embodiment of the present disclosure.

[0165] A base station (800) according to one embodiment of the present disclosure may include an NG-RAN.

[0166] Referring to FIG. 8, the base station (800) may be configured with a transceiver (810), a processor (820), and a memory (830). According to FIGS. 1 to 6 described above, the transceiver (810), the processor (820), and the memory (830) of the base station (800) may operate. However, the components of the base station (800) are not limited to the examples described above. For example, the base station (800) may include more or fewer components than the components described above. In one embodiment, the transceiver (810), the processor (820), and the memory (830) may be implemented in the form of a single chip. In addition, the processor (820) may include one or more processors.

[0167] The transceiver (810) is a general term for the receiver of the base station (800) and the transmitter of the base station (800), and can transmit and receive signals with a network entity including a UE or a network entity (700). The signals transmitted and received with the network entity including the UE or the network entity (700) may include control information and data. To this end, the transceiver (810) may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-down-converts a received signal. However, this is only one embodiment of the transceiver (810), and the components of the transceiver (810) are not limited to the RF transmitter and the RF receiver.

[0168] Additionally, the transceiver (810) can perform functions for transmitting and receiving signals via a wireless channel. For example, the transceiver (810) can receive a signal via a wireless channel, output it to the processor (820), and transmit the signal output from the processor (820) via the wireless channel.

[0169] The memory (830) can store programs and data required for the operation of the network entity (700). In addition, the memory (830) can store control information or data included in a signal acquired from the DU (800). The memory (830) can be configured as a storage medium or a combination of storage media, such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD. In addition, the memory (830) may not exist separately but may be included in the processor (820). The memory (830) can be configured as a volatile memory, a nonvolatile memory, or a combination of volatile and nonvolatile memories. In addition, the memory (830) can provide stored data upon request of the processor (820).

[0170] The processor (820) may control a series of processes so that the DU (800) may operate according to the above-described embodiment of the present disclosure. For example, the processor (820) may receive control signals and data signals through the transceiver (810) and process the received control signals and data signals. The processor (820) may transmit the processed control signals and data signals through the transceiver (810). In addition, the processor (820) may write or read data to or from the memory (830). The processor (820) may perform functions of a protocol stack required by a communication standard. For this purpose, the processor (820) may include at least one processor or microprocessor. In one embodiment, a part of the transceiver (810) or the processor (820) may be referred to as a communication processor (CP).

[0171] The processor (820) may be composed of one or more processors. In this case, one or more processors may be a general-purpose processor, such as a CPU, AP, or DSP (Digital Signal Processor), a graphics-only processor, such as a GPU or VPU (Vision Processing Unit), or an AI-only processor, such as an NPU. For example, if one or more processors are AI-only processors, the AI-only processor may be designed with a hardware structure specialized for processing a specific AI model.

[0172] At least one processor (820) may include various processing circuits and / or multiple processors. For example, the term “processor” as used herein, including in the claims, may include various processing circuits, including at least one processor. One or more processors in the at least one processor may be configured to perform various functions described herein, individually and / or collectively, in a distributed fashion. As used herein, “processor,” “at least one processor,” and “one or more processors” may be configured to perform multiple functions. However, these terms encompass, without limitation, situations where one processor performs some of the functions and other processor(s) perform other parts of the functions, and situations where a single processor may perform all of the functions. Furthermore, the at least one processor may include a combination of processors that perform various of the disclosed functions in a distributed manner. The at least one processor may execute program instructions to achieve or perform various functions.

[0173] The specific examples used to explain embodiments according to the present disclosure are merely one combination of each criterion, method, detailed method, and operation, and when supporting QoS at the application level in a wireless communication system through a combination of at least two or more of the various techniques described, data transmission and reception can be smoothly managed according to the conditions of the base station. In addition, at this time, the operation may be performed according to a method determined through one or a combination of at least two of the aforementioned techniques. For example, it may be possible to perform a portion of the operation of one embodiment in combination with a portion of the operation of another embodiment.

[0174] A device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, the term "non-transitory storage medium" simply means a tangible device that does not contain signals (e.g., electromagnetic waves). This term does not distinguish between cases where data is permanently stored in the storage medium and cases where data is temporarily stored. For example, a "non-transitory storage medium" may include a buffer in which data is temporarily stored.

[0175] According to one embodiment, the method according to various embodiments disclosed in the present document may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) through an application store or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., a downloadable app) may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

Claims

1. In a wireless communication system, a method of a base station, A step of receiving a first message including PDU (Protocol Data Unit) Set QoS (Quality of Service) parameters from a core network entity; A step of determining whether one or more QoS flows satisfy the PDU Set QoS parameters; and If it is determined that one or more of the above QoS flows do not satisfy the above PDU Set QoS parameters, A method comprising the step of transmitting, to the core network entity, a second message including information indicating that PDU Set handling for a QoS flow is not to be applied based on a local policy regarding PDU set based admission control of the base station.

2. In paragraph 1, A method further comprising the step of transmitting, to an AF (Application Function), a second message including information indicating that PDU Set handling for the QoS flow is not applied through the core network.

3. A method in which, in the first paragraph, information indicating that PDU Set handling is not applied to the QoS flow includes an ID of the QoS flow and indicates that PDU Set handling is not applied for each QoS flow.

4. In paragraph 1, A step of receiving a third message including a PDU set based admission control policy from the core network entity; and If it is determined that one or more of the above QoS flows do not satisfy the above PDU Set QoS parameters, A method further comprising the step of transmitting a fourth message including modified PDU Set QoS parameters to the core network entity based on the received PDU set-based admission control policy.

5. In paragraph 1, A step of receiving a third message including a PDU set based admission control policy from the core network entity; and If it is determined that one or more of the above QoS flows do not satisfy the above PDU Set QoS parameters, A method further comprising the step of transmitting a fifth message including information indicating rejection of the one or more QoS flows to the core network entity based on the received PDU set-based admission control policy.

6. A method in accordance with claim 5, wherein the information indicating rejection of one or more QoS flows is list information including IDs of one or more QoS flows rejected by the base station.

7. In paragraph 1, A step of receiving a third message including a PDU set based admission control policy from the core network entity; and If it is determined that one or more of the above QoS flows do not satisfy the above PDU Set QoS parameters, A method further comprising the step of transmitting a sixth message including information indicating that PDU Set handling for a QoS flow is not to be applied to the core network entity based on the received PDU set-based admission control policy.

8. In a wireless communication system, a method of a core network entity, A step of transmitting a first message including PDU Set QoS parameters to a base station; If the QoS flow does not satisfy the above PDU Set QoS parameters, A step of receiving a second message including information indicating that PDU Set handling for a QoS flow is not applied based on a PDU set based admission control policy from the base station; and A method comprising the step of transmitting, to an Application Function (AF), a third message including information indicating that PDU Set handling is not to be applied to the above QoS flow.

9. In a wireless communication system, at a base station, memory containing one or more instructions; and comprising at least one processor; wherein said at least one processor executes said one or more instructions stored in said memory: Receive a first message from a core network entity containing PDU (Protocol Data Unit) Set QoS (Quality of Service) parameters, Determining whether one or more QoS flows satisfy the above PDU Set QoS parameters, and If it is determined that one or more of the above QoS flows do not satisfy the above PDU Set QoS parameters, A base station that transmits a second message including information indicating that PDU Set handling for a QoS flow is not applied to the core network entity based on a local policy regarding PDU set based admission control of the base station.

10. In the 9th paragraph, the at least one processor further executes the one or more instructions stored in the memory: A base station that transmits a second message including information indicating that PDU Set handling for the above QoS flow is not applied to the AF (Application Function) through the core network.

11. A base station in clause 9, wherein the information indicating that PDU Set handling is not applied to the QoS flow includes an ID of the QoS flow and indicates that PDU Set handling is not applied for each QoS flow.

12. In the 9th paragraph, the at least one processor further executes the one or more instructions stored in the memory: Receive a third message from the core network entity including a PDU set based admission control policy, and If it is determined that one or more of the above QoS flows do not satisfy the above PDU Set QoS parameters, A base station transmitting a fourth message including modified PDU Set QoS parameters to the core network entity based on the received PDU set-based admission control policy.

13. In the 9th paragraph, the at least one processor further executes the one or more instructions stored in the memory: Receive a third message from the core network entity including a PDU set based admission control policy, and If it is determined that one or more of the above QoS flows do not satisfy the above PDU Set QoS parameters, A base station transmitting a fifth message including information indicating rejection of one or more QoS flows to the core network entity based on the received PDU set-based admission control policy.

14. In the 9th paragraph, the at least one processor further executes the one or more instructions stored in the memory: Receive a third message from the core network entity including a PDU set based admission control policy, and If it is determined that one or more of the above QoS flows do not satisfy the above PDU Set QoS parameters, A base station that transmits a sixth message including information indicating that PDU Set handling for a QoS flow is not applied to the core network entity based on the received PDU set-based admission control policy.

15. In a wireless communication system, in a core network entity, memory containing one or more instructions; and comprising at least one processor; wherein said at least one processor executes said one or more instructions stored in said memory: Transmitting a first message including a PDU (Protocol Data Unit) Set QoS (Quality of Service) parameter to the base station, If the QoS flow does not satisfy the above PDU Set QoS parameters, Receive a second message from the base station including information indicating that PDU Set handling for the QoS flow is not applied based on a PDU set based admission control policy, and A core network entity that transmits, to the Application Function (AF), a third message containing information indicating that PDU Set handling is not to be applied to the above QoS flow.

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