Method and device for managing session in wireless communication system

Abstract

The present disclosure relates to a method performed by a terminal in a wireless communication system, the method comprising the steps of: transmitting, to a session management function (SMF) entity, a protocol data unit (PDU) establishment request message for a first PDU session on a first data network; receiving a PDU session authentication request message for the first data network from the SMF entity; transmitting a PDU session authentication complete message to the SMF entity; receiving, from the SMF entity, a PDU session authentication result message indicating that the first data network is not allowed; and receiving, from the SMF entity, a PDU session establishment reject message including information on the disallowed first data network.

Description

Method and device for managing sessions in a wireless communication system

[0001] The present disclosure relates to a device and method for supporting terminal mobility and session management during communication in a wireless communication system. Specifically, the present disclosure proposes a method and device for resolving a situation in which multiple terminals simultaneously access a specific data network, resulting in congestion, when authentication for the data network to which the terminal is attempting to connect fails during session establishment.

[0002] In addition, specifically, the present disclosure relates to a method and device for resolving congestion of a data network caused by multiple attempts by a terminal to establish a session when the terminal fails to establish a session for a data network to which the terminal is attempting to connect.

[0003] 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.

[0004] 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.

[0005] 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.

[0006] 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.

[0007] 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).

[0008] 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.

[0009] The present disclosure relates to a device and method for supporting mobility and session management of a terminal when communicating in a wireless communication system.

[0010] Specifically, the present disclosure relates to a method and device for resolving a situation in which congestion occurs when multiple terminals simultaneously access a specific data network when authentication for the data network to which the terminal is attempting to access fails in establishing a session of the terminal.

[0011] In addition, the present disclosure specifically relates to a method and device for resolving congestion of a data network that occurs due to multiple attempts by a terminal to establish a session when establishing a session for a data network to which the terminal is attempting to connect fails.

[0012] According to one embodiment of the present invention, a method for solving the above-described problem is characterized by comprising the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; generating a second signal based on the processing; and transmitting the generated second control signal to the base station.

[0013] According to embodiments of the present disclosure, a terminal can prevent congestion from occurring in a specific data network by controlling session establishment of the terminals and controlling state transition of the terminals so that congestion does not occur in the data network where the terminal is trying to establish a session.

[0014] In addition, when a terminal fails to connect to a specific data network, the state transition of the terminal can be efficiently controlled to prevent indiscriminate disconnection of the terminal, thereby saving the time required for the terminal to reconnect and establish a session.

[0015] FIG. 1 illustrates a terminal and a network environment for wireless communication in an environment supporting 5G communication according to one embodiment of the present disclosure.

[0016] FIG. 2 is a flowchart illustrating a procedure for performing communication in an environment supporting 5G communication according to one embodiment of the present disclosure.

[0017] FIG. 3 is a flowchart illustrating a procedure for performing communication in an environment supporting 5G communication according to one embodiment of the present disclosure.

[0018] FIG. 4 is a diagram showing the configuration of a terminal according to one embodiment of the present disclosure.

[0019] FIG. 5 is a diagram illustrating a configuration of a network entity according to one embodiment of the present disclosure.

[0020] FIG. 6 is a diagram showing the configuration of a base station according to one embodiment of the present disclosure.

[0021] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. In describing the embodiments, descriptions of technical details that are well-known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to avoid obscuring the gist of the present disclosure by omitting unnecessary explanations and to convey the gist more clearly.

[0022] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0023] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the invention, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0024] At this time, it will be understood that each block of the processing flow diagrams and combinations of the flow diagrams can be performed by computer program instructions.

[0025] 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.

[0026] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0027] The terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, and terms referring to various identification information 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 with equivalent technical meanings may be used.

[0028] For the convenience of explanation below, the present disclosure uses terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard or the 3GPP NR standard, or terms and names modified based thereon. However, the present disclosure is not limited to the above-described terms and names, and may be equally applied to systems conforming to other standards. In the present disclosure, a base station is an entity that performs resource allocation to a user equipment (UE), and may be at least one of a gNode B, a gNB, an eNode B, an eNB, a Node B, a BS, a RAN (radio access network), a NG-RAN (next generation-RAN), a base station controller, or a node on a network. The base station may provide network access to the UE(s) in an LTE system or an NR system. For the convenience of explanation, eNB and gNB may be used interchangeably. That is, a base station described as an eNB may represent a gNB. In the present disclosure, the term terminal may refer to various wireless communication devices, including mobile phones, NB (narrow band)-IoT devices, and sensors.

[0029] That is, in specifically explaining the embodiments of the present disclosure, the communication standards specified by 3GPP will be the main target, but the main gist of the present disclosure can 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 can be done at the discretion of a person skilled in the technical field of the present disclosure.

[0030] In 5G or NR systems, the Access and Mobility Management Function (AMF), which manages the mobility of terminals, and the Session Management Function (SMF), which manages sessions, are separated. Accordingly, unlike in 4G LTE communication systems where the Mobility Management Entity (MME) performed both mobility management and session management, in 5G or NR systems, the entities performing mobility management and session management are separated into the AMF and the SMF, respectively, which has changed the communication method and communication management method between terminals and network entities.

[0031] In 5G or NR systems, non-3GPP access can be managed through the AMF via the Non-3GPP Inter-Working Function (N3IWF), with mobility management performed through the AMF and session management performed through the SMF. Furthermore, security-related information, a crucial element in mobility management, can be processed through the AMF.

[0032] The present disclosure relates to a device and method for supporting mobility and session management of a terminal when communicating in a wireless communication system.

[0033] Specifically, the present disclosure is intended to resolve a situation in which congestion occurs when multiple terminals simultaneously access a specific data network when authentication for the data network to which the terminal is attempting to access fails in establishing a session of the terminal.

[0034] In addition, the present disclosure specifically relates to a method for resolving congestion of a data network that occurs due to multiple attempts by a terminal to establish a session when the session establishment for the data network to which the terminal is attempting to connect fails in establishing a session of the terminal.

[0035] To this end, a method and device for controlling terminals, AMF, SMF, etc. that communicate with a cellular network are described.

[0036] FIG. 1 illustrates a terminal and a network environment for wireless communication in an environment supporting 5G communication according to one embodiment of the present disclosure.

[0037] Referring to FIG. 1, a 5G or NR core network may be composed of network functions (NFs) such as a User Plane Function (UPF, 131), a Session Management Function (SMF, 121), an Access and Mobility Management Function (AMF, 111), a 5G Radio Access Network (RAN, 103), a User Data Management (UDM, 151), a Policy Control Function (PCF, 161), an application function (AF, 181), and an operation administration and maintenance (OAM, 191). In addition, for authentication of these entities, entities such as an Authentication Server Function (AUSF, 141), and an authentication, authorization, and accounting (AAA, 171) may be included in the 5G or NR core network.

[0038] AMF (111) is an entity for managing access and mobility of UE (101). For example, AMF (111) can perform network functions such as registration, connection, reachability, mobility management, access verification, authentication, and mobility event generation of UE (101).

[0039] The SMF (121) can perform management functions for the PDU (Protocol Data Unit) session of the UE (101). For example, the SMF (121) can perform network functions such as session management functions through the establishment, modification, and release of sessions and the maintenance of tunnels between the UPF (131) and the RAN (103) required therefor, IP (Internet Protocol) address allocation and management functions of the UE (101), user plane selection and control, traffic processing control in the UPF (131), and charging data collection control.

[0040] The UPF (131) performs the role of processing data of the UE (101), and can perform the role of processing data so that data transmitted by the UE (101) can be transmitted to an external network or data received from an external network can be transmitted to the UE (101). For example, the UPF (131) can perform network functions such as serving as an anchor between radio access technologies (RATs), packet routing and forwarding, packet inspection, user plane policy application, traffic usage report creation, buffering, etc.

[0041] UDM (151) can perform functions such as generating authentication information for 3GPP security, processing user identifiers (User IDs), managing a list of network functions (NFs) supporting UE (101), and managing subscription information.

[0042] PCF (161) is an NF that manages operator policy information for providing services in a 5G system.

[0043] A UE (User Equipment or Terminal) (101) can access a network through a 5G base station (or 5G RAN, 103) or a satellite RAN. Meanwhile, an N3IWF (N3 interworking function) may exist for cases where the UE communicates through a non-3GPP connection. In the case of communication through a non-3GPP connection, session management is controlled by the UE (101), the non-3GPP connection, the N3IWF, and the SMF (121), and mobility management of the non-3GPP connection can be controlled by the UE (101), the non-3GPP connection, the N3IWF, and the AMF (111).

[0044] As described above, in a 4G LTE system, the MME can handle both mobility management and session management. In a 5G system, the entities performing mobility management and session management are separated into the AMF (111) and the SMF (121), respectively. Meanwhile, the 5G system is considering a stand-alone (SA) deployment structure, in which communication is performed only with 5G entities, and a non-SA deployment structure, in which 4G and 5G entities are used together.

[0045] As shown in Fig. 1, when the UE (101) communicates with the network, control of the UE (101) is performed by the base station (103, 104), and a configuration in which a 5G network entity of the core network is used may be possible. In this case, mobility management between the UE (101) and the AMF (111) and session management between the UE (101) and the SMF (121) may be performed in the NAS (Non Access Stratum) layer, also known as Layer 3.

[0046] The communication network on which this disclosure is based assumes a 5G NR or 4G LTE network, but the same concept can be applied to other systems within a scope that can be understood by a person with ordinary technical skills.

[0047] FIG. 2 is a flowchart illustrating a procedure for performing communication in an environment supporting 5G communication according to one embodiment of the present disclosure.

[0048] FIG. 2 illustrates an embodiment in which a network allows retrying reconnection to prevent congestion from occurring due to multiple attempts when a PDU session authentication process fails, and transmits time offset information to a UE to distribute attempts from multiple UEs.

[0049] Referring to FIG. 2, at step 201, a terminal (or UE, 101) may transmit a registration request message requesting registration to AMF (111).

[0050] In step 205, AMF (111) can transmit a registration accept message to UE (101) in response to the registration request message received in step 201.

[0051] At step 211, the UE (101) can transmit a PDU session establishment request message to the SMF (121).

[0052] At step 221, after receiving a PDU session establishment request message from the UE (101), the SMF (121) may transmit a PDU session authentication command message to the UE if authentication is required for the data network to which the UE is to connect for session establishment.

[0053] At step 223, the UE (101) can transmit a PDU session authentication complete message to the SMF (121).

[0054] At step 225, the SMF (121) may transmit a PDU session authentication result message to the UE (101). At this time, the UE (101) may not be authorized to use the data network by the network.

[0055] At step 231, the SMF (121) can make a decision on whether to set a time offset, whether to transmit a no detach parameter, and whether to maintain a database entry for the UE (101).

[0056] At step 233, the SMF (121) may send a PDU session establishment reject or PDU session establishment accept message to the UE (101). At this time, the information transmitted through the PDU session establishment reject / accept message may include the following parameters. However, the present invention is not limited thereto.

[0057] - Retry permission can be set to off. Retry permission can include whether the UE will retransmit the message if transmission of the message fails, i.e., whether to allow retry. If Retry permission is set to off, the UE may not request a session for the data network. Therefore, the UE that receives the parameter may later need to request a session for another data network or another network.

[0058] - You can send it by setting the retry time offset. In one embodiment, the network can assign a range value to the retry time offset. For example, if the retry time offset value is set to 0 to 63, the UE can randomly select a value within the range from 0 to 63 and send the PDU session establishment request message after setting an offset equal to the corresponding time.

[0059] At step 241, the SMF (121) can notify the AMF (111) that the UE (101) will transition to a no-detach state. That is, the SMF (121) can notify the AMF (111) that the UE is in a no-detach state by transmitting a no-detach parameter to the terminal (101).

[0060] Additionally, if the UE (101) receives an off value for retry permission in step 233, it may not send a PDU session establishment request or a PDU session modification request message to the same data network thereafter.

[0061] At step 261, the UE (101) may transmit a PDU session establishment request message to the SMF (121). Alternatively, the UE (101) may transmit a PDU session modification request message. At this time, if the UE (101) has previously received an off value for the information element called retry permission, the UE (101) may not send a PDU session establishment request message for the same data network, but may transmit a PDU session establishment request message for another data network.

[0062] At step 271, the SMF (121) may transmit a PDU session establishment accept or PDU session modification accept message to the UE (101). At this time, the parameters transmitted in the PDU session establishment accept or PDU session modification accept message may include the following parameters or information elements. However, the present invention is not limited thereto.

[0063] - Retry permission can be set to off. Retry permission can be used to determine whether the UE will retransmit the message if transmission of the message fails, i.e., whether to allow retry. If Retry permission is set to off, the UE may not request a session for the data network. Therefore, the UE that receives the parameter can later request a session for another data network or another network.

[0064] - You can send it by setting the retry time offset. In one example, the network can provide a range of retry time offset values. For example, if the retry time offset value is set to 0 to 63, the terminal can randomly select a value within the range from 0 to 63 and send the PDU session establishment request message after setting an offset equal to the corresponding time.

[0065] At step 281, the terminal (101) can store information (or values) received from the SMF (121).

[0066] - The terminal can randomly select a value within the range of 0 to 63 for the received retry time offset value and then transmit the PDU session establishment request message after setting an offset equal to the corresponding time.

[0067] - If the Retry permission is set to off, the UE must not request a session for the corresponding data network. Therefore, the UE that receives the parameter may later request a session for another data network or another network.

[0068] FIG. 3 is a flowchart illustrating a procedure for performing communication in an environment supporting 5G communication according to one embodiment of the present disclosure.

[0069] FIG. 3 illustrates an embodiment for preventing congestion from occurring due to multiple attempts, forcibly detaching a UE, or state transition of a UE's state machine to a detach state when a PDU session authentication process fails. FIG. 3 also illustrates an embodiment for determining whether a network allows a retry attempt and for transmitting time offset information to a UE to distribute attempts from multiple UEs. FIG. 3 also illustrates an operation in which a network sends information to a UE not to perform a state transition that changes the terminal state to detach, and the UE, without performing a state transition, establishes a PDU session to a data network other than the corresponding data network or modifies the PDU session.

[0070] At step 301, the terminal (101) can transmit a registration request message to AMF (111).

[0071] At step 305, AMF (111) can transmit a registration accept message in response to a registration request message to the terminal (101).

[0072] At step 311, the terminal (UE, 101) can transmit a PDU session establishment request message to the SMF (121).

[0073] In step 321, after receiving a PDU session establishment request message from the UE (101), the SMF (121) may transmit a PDU session authentication command message if authentication is required for the data network to which the terminal is connected.

[0074] At step 323, the UE (101) can transmit a PDU session authentication complete message to the SMF (121).

[0075] At step 325, the SMF (121) may transmit a PDU session authentication result message to the UE (101). At this time, the UE (101) may not be authorized to use the data network by the network.

[0076] At step 331, the SMF (121) can make a decision on whether to set a time offset, whether to send a no detach parameter, and whether to maintain a database entry for the UE.

[0077] At step 333, the SMF (121) may transmit a PDU session establishment reject or PDU session establishment accept message to the UE (101). At this time, the information transmitted through the PDU session establishment reject / accept message may include the following parameters. However, the present invention is not limited thereto.

[0078] - Retry permission can be set to off. Retry permission can include whether the UE will retransmit the message if transmission of the message fails, i.e., whether to allow retry. If Retry permission is set to off, the UE may not request a session for the data network. Therefore, the UE that receives the parameter may later request a session for another data network or another network.

[0079] - You can send it by setting the retry time offset. In one embodiment, the network can provide a range of values ​​for the retry time offset. For example, if the retry time offset value is set to 0 to 63, the UE can randomly select a value within the range from 0 to 63 and send the PDU session establishment request message after setting an offset equal to the corresponding time.

[0080] - In addition, SMF (121) can set and transmit a parameter such as a no-detach information element to UE (101). This parameter may be a parameter to prevent the UE from transitioning the state transition of the UE to a detach state when the UE receives the parameter.

[0081] At step 341, the SMF (121) can notify the AMF (111) that the corresponding UE (101) will transition to a no-detach state. That is, the SMF (121) can notify the AMF (111) that the corresponding UE (101) is in a no-detach state by transmitting a no-detach parameter to the corresponding UE (101).

[0082] At step 343, AMF (111) may transmit a message to UE (101). At this time, the message transmitted by AMF (111) to UE (101) may include a no detach parameter.

[0083] At step 351, the UE (101) may receive and store the no-detach information element included in the message received from the AMF (111). In addition, the UE (101) may not change the state to a detach state.

[0084] Additionally, if the UE (101) receives an off value for retry permission, it may not transmit a PDU session establishment request or a PDU session modification request message to the same data network thereafter.

[0085] At step 361, the UE (101) may transmit a PDU session establishment request message to the SMF (121). Alternatively, the UE (101) may transmit a PDU session modification request message to the SMF (121). At this time, if the UE (101) has previously received an off value for the information element called retry permission, the UE (101) may not transmit a PDU session establishment request message for the same data network, but may transmit a PDU session establishment request message for another data network.

[0086] At step 371, the SMF (121) may transmit a PDU session establishment accept or PDU session modification accept message to the UE (101). At this time, the parameters transmitted through the PDU session establishment accept or PDU session modification accept message may include the following parameters or information elements. However, the present invention is not limited thereto.

[0087] - Retry permission can be set to off. Retry permission determines whether the UE will retransmit the message if transmission of the message fails, i.e., whether to allow retry. If Retry permission is set to off, the UE may not request a session for the data network. Therefore, the UE that receives the parameter can later request a session for another data network or another network.

[0088] - You can send it by setting the retry time offset. In one embodiment, the network can provide a range of values ​​for the retry time offset. For example, if the retry time offset value is set to 0 to 63, the UE can randomly select a value within the range from 0 to 63 and send the PDU session establishment request message after setting an offset equal to the corresponding time.

[0089] - In addition, SMF can transmit a no-detach information element (i.e. parameter) to the UE. This parameter can be information to prevent the UE from transitioning to detach state when the UE receives the parameter.

[0090] At step 381, the UE (101) can store information (or values) received from the SMF (121).

[0091] - The UE can randomly select a value within the range of 0 to 63 for the received retry time offset value and then transmit the PDU session establishment request message after setting an offset equal to the corresponding time.

[0092] - If the Retry permission is set to off, the UE may not request a session for the corresponding data network. Therefore, the UE that receives the parameter may later request a session for another data network or other network.

[0093] FIG. 4 is a diagram showing the configuration of a UE according to one embodiment of the present disclosure.

[0094] As illustrated in FIG. 4, the terminal of the present disclosure may include a transceiver (410), a memory (420), and a processor (430). The processor (430), the transceiver (410), and the memory (420) of the UE may operate according to the aforementioned UE communication method. However, the components of the UE are not limited to the examples described above. For example, the UE may include more or fewer components than the aforementioned components. In addition, the processor (430), the transceiver (410), and the memory (420) may be implemented in the form of a single chip.

[0095] The transceiver (410) is a general term for the receiver and transmitter of the UE, and can transmit and receive signals with a base station or various network entities. The signals transmitted and received with the base station may include control information and data. To this end, the transceiver (410) may be configured with an RF (radio frequency) transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-downconverts the received signal. However, this is only an example of the transceiver (410), and the components of the transceiver (410) are not limited to the RF transmitter and RF receiver. In addition, the transceiver (410) may include wired and wireless transceivers, and may include various configurations for transmitting and receiving signals. In addition, the transceiver (410) may receive a signal through a wireless channel, output it to the processor (430), and transmit the signal output from the processor (430) through the wireless channel. In addition, the transceiver (410) can receive a communication signal and output it to the processor, and transmit the signal output from the processor to various network entities via a wired or wireless network.

[0096] The memory (420) can store programs and data required for the operation of the UE. In addition, the memory (420) can store control information or data included in signals acquired from the UE. The memory (420) 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.

[0097] The processor (430) can control a series of processes so that the UE can operate according to the embodiments of the present disclosure described above. The processor (430) may include at least one processor. For example, the processor (430) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs.

[0098] FIG. 5 is a diagram illustrating a configuration of a network entity according to one embodiment of the present disclosure.

[0099] As illustrated in FIG. 5, a network entity of the present disclosure may include a transceiver (510), a memory (520), and a processor (530). The processor (530), the transceiver (510), and the memory (520) of the network entity may operate according to the communication method of the network entity described above. However, the components of the network entity are not limited to the examples described above. For example, the network entity may include more or fewer components than the components described above. In addition, the processor (530), the transceiver (510), and the memory (520) may be implemented in the form of a single chip. A network entity may include network functions (NF) such as the Access and Mobility Management Function (AMF), Session Management Function (SMF), Policy Control Function (PCF), Network Exposure Function (NEF), Unified Data Management (UDM), and User Plane Function (UPF) described above. It may also include a base station.

[0100] The transceiver (510) is a general term for the receiving unit and the transmitting unit of a network entity, and can transmit and receive signals with a terminal or other network entities. At this time, the transmitted and received signals may include control information and data. To this end, the transceiver (510) 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-downconverts the received signal. However, this is only an example of the transceiver (510), and the components of the transceiver (510) are not limited to the RF transmitter and RF receiver. The transceiver (510) may include wired and wireless transceivers, and may include various configurations for transmitting and receiving signals. In addition, the transceiver (510) may receive a signal through a communication channel (e.g., a wireless channel), output it to the processor (530), and transmit the signal output from the processor (530) through the communication channel. In addition, the transceiver (510) can receive a communication signal and output it to the processor, and transmit the signal output from the processor to a terminal or network entity via a wired or wireless network.

[0101] The memory (520) can store programs and data required for the operation of the network entity. In addition, the memory (520) can store control information or data included in signals acquired from the network entity. The memory (520) 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.

[0102] The processor (530) may control a series of processes to enable a network entity to operate according to the embodiments of the present disclosure described above. The processor (530) may include at least one processor. The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0103] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present disclosure.

[0104] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage devices, compact disc-ROMs (CD-ROMs), digital versatile discs (DVDs) or other forms of optical storage devices, magnetic cassettes, or may be stored in memories formed by a combination of some or all of these. In addition, each configuration memory may include multiple copies.

[0105] Additionally, the program may be stored on an attachable storage device that is accessible via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device performing an embodiment of the present disclosure.

[0106] FIG. 6 is a diagram showing the configuration of a base station according to an embodiment of the present disclosure.

[0107] Referring to FIG. 6, the base station may include a transceiver (610), a memory (620), and a processor (630). The transceiver (610), the memory (620), and the processor (630) may operate according to the communication method of the base station described above. The network device may also correspond to the structure of the base station. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than the components described above. For example, the base station may include a transceiver (610) and a processor (630). In addition, the transceiver (610), the memory (620), and the processor (630) may be implemented in the form of a single chip.

[0108] The transceiver (610) is a general term for the receiving unit and the transmitting unit of the base station, and can transmit and receive signals with terminals, other base stations, or other network devices. At this time, the transmitted and received signals may include control information and data. The transceiver (610) may, for example, transmit system information to the terminal, and transmit a synchronization signal or a reference signal. To this end, the transceiver (610) 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 (610), and the components of the transceiver (610) are not limited to the RF transmitter and RF receiver. The transceiver (610) may include wired and wireless transceivers, and may include various configurations for transmitting and receiving signals. In addition, the transceiver (610) may receive a signal through a communication channel (e.g., a wireless channel) and output it to the processor (630), and transmit the signal output from the processor (630) through the communication channel. In addition, the transceiver (610) may receive a communication signal and output it to the processor, and transmit the signal output from the processor to a terminal, another base station, or another entity through a wired or wireless network.

[0109] The memory (620) can store programs and data required for the operation of the base station. In addition, the memory (620) can store control information or data included in signals acquired from the base station. The memory (620) 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 (620) can store at least one of information transmitted and received through the transceiver (610) and information generated through the processor (630).

[0110] In the present disclosure, the processor (630) may be defined as a circuit or application-specific integrated circuit, or at least one control unit. The processor may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The processor (630) may control the overall operation of the base station according to the embodiment proposed in the present disclosure. For example, the processor (630) may control the signal flow between each block to perform operations according to the flowchart described above.

[0111] In the specific embodiments of the present disclosure described above, components included in the disclosure are expressed in the singular or plural form, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in the plural form may be composed of singular elements, or components expressed in the singular form may be composed of plural elements.

[0112] While the detailed description of this disclosure has described specific embodiments, it should be understood that various modifications are possible without departing from the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the described embodiments, but should be defined not only by the scope of the claims described below, but also by equivalents thereof.

Claims

1. In a method performed by a terminal (user equipment) in a wireless communication system, A step of transmitting a PDU establishment request message for a first PDU (protocol data unit) session to an SMF (session management function) entity on a first data network; A step of receiving a PDU session authentication request message for the first data network from the SMF entity; A step of transmitting a PDU session authentication completion message to the above SMF entity; receiving a PDU session authentication result message from the SMF entity indicating that the first data network is not allowed; and A method comprising the step of receiving a PDU session establishment rejection message including information about the first data network that is not permitted from the SMF entity.

2. In claim 1, the information about the first data network is: A method comprising information indicating permission to retransmit a PDU session establishment request message for the first data network, a retransmission time offset of the PDU session establishment request message, or information indicating a state transition of the terminal.

3. In claim 2, the method comprises: If the information indicating the retransmission authority of the above PDU session establishment request message is off, the method further includes a step of transmitting a PDU session establishment request message for a second PDU session on a second data network, A method in which a PDU session establishment request message for the first data network is not retransmitted.

4. In claim 2, A method in which information indicating a state transition of the terminal indicates a non-transition of the terminal to a detach state.

5. In a wireless communication system, in the terminal (user equipment), transceiver; and including a controller coupled with the above transmitter and receiver, The above controller, Send a PDU establishment request message for the first PDU (protocol data unit) session to the SMF (session management function) entity on the first data network, Receive a PDU session authentication request message for the first data network from the SMF entity; Send a PDU session authentication completion message to the above SMF entity, Receive a PDU session authentication result message from the above SMF entity indicating that the first data network is not allowed; A terminal configured to receive a PDU session establishment rejection message including information about the first data network that is not permitted from the SMF entity.

6. In claim 5, the information about the first data network is: A terminal including information indicating permission to retransmit a PDU session establishment request message for the first data network, a retransmission time offset of the PDU session establishment request message, or information indicating a state transition of the terminal.

7. In claim 6, the controller, If the information indicating the retransmission authority of the above PDU session establishment request message is off, it is further set to transmit the PDU session establishment request message for the second PDU session on the second data network, A terminal for which a PDU session establishment request message for the first data network is not retransmitted.

8. In claim 6, Information indicating a state transition of the terminal indicates a non-transition of the terminal to a detach state.

9. In a method performed by an SMF (session management function) entity in a wireless communication system, A step of receiving a PDU establishment request message for a first PDU (protocol data unit) session on a first data network from the user equipment; A step of transmitting a PDU session authentication request message for the first data network to the terminal; A step of receiving a PDU session authentication completion message from the terminal; A step of transmitting a PDU session authentication result message indicating to the terminal that the first data network is not allowed; and A method comprising the step of transmitting a PDU session establishment rejection message including information about the first data network that is not permitted to the terminal.

10. In claim 9, the information about the first data network is: A method comprising information indicating permission to retransmit a PDU session establishment request message for the first data network, a retransmission time offset of the PDU session establishment request message, or information indicating a state transition of the terminal.

11. In claim 10, the method comprises: Further comprising the step of transmitting, to the terminal, a PDU session establishment request message for a second PDU session on a second data network, A method in which a PDU session establishment request message for the first data network is not re-received.

12. In claim 10, A method in which information indicating a state transition of the terminal indicates a non-transition of the terminal to a detach state.

13. In a wireless communication system, in the SMF (session management function) entity, Receive a PDU establishment request message for a first PDU (protocol data unit) session from the user equipment on the first data network, Transmitting a PDU session authentication request message for the first data network to the terminal; Receive a PDU session authentication completion message from the above terminal, Transmitting a PDU session authentication result message to the terminal indicating that the first data network is not allowed, An SMF entity configured to transmit a PDU session establishment rejection message containing information about the first data network that is not permitted to the terminal.

14. In claim 13, the information about the first data network is: An SMF entity comprising information indicating permission to retransmit a PDU session establishment request message for the first data network, a retransmission time offset of the PDU session establishment request message, or information indicating a state transition of the terminal.

15. In claim 13, the controller, It is further configured to transmit a PDU session establishment request message for a second PDU session on a second data network to the terminal, The PDU session establishment request message for the above first data network is not re-received by the SMF entity.

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