Network node, terminal, and control method

Abstract

This network node includes: a reception unit that receives a protocol data unit (PDU) session establishment request related to a certain terminal from an access and mobility management function (AMF); a transmission unit that transmits, to the AMF, a rejection signal instructing routing via a data collection coordination function (DCCF); and a control unit that accesses, according to the congestion state of a data network name (DNN), the DCCF to acquire signal data for a PDU session establishment request related to the certain terminal.

Description

Technical Field

[0001] The present invention relates to a network node, a terminal, and a control method in a communication system. Background Art

[0002] In 3GPP (registered trademark) (3rd Generation Partnership Project), a radio communication scheme called 5G or NR (New Radio) (hereinafter, this radio communication scheme is referred to as "5G" or "NR") is being studied to achieve further increase in system capacity, further increase in data transmission speed, further reduction in latency in radio sections, and the like. In 5G, various radio technologies are being studied to satisfy the requirement that the latency in the radio section be 1 ms or less while achieving a throughput of 10 Gbps or more.

[0003] In NR, a network architecture including 5GC (5G Core Network) corresponding to EPC (Evolved Packet Core), which is the core network in the LTE (Long Term Evolution) network architecture, and NG-RAN (Next Generation - Radio Access Network) corresponding to E-UTRAN (Evolved Universal Terrestrial Radio Access Network), which is RAN (Radio Access Network) in the LTE network architecture, is being studied (for example, Non-Patent Document 1).

[0004] Furthermore, to regulate network congestion, the SMF (Session Management function) detects congestion in the DNN (Data Network Name) and notifies the terminal of the backoff timer via the AMF (Access and Mobility Management Function). This function reduces the load on the network side by suppressing signal transmission at the terminal until the backoff timer expires (see Non-Patent Literature 1). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 23.501 V17.6.0(2022-09) [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The expiration time of the backoff timer, which is notified to terminals during network congestion, represents a trade-off between network load and usability. A longer backoff timer reduces network load, but the downtime is extended, thus decreasing usability. A shorter backoff timer reduces downtime, but increases network load.

[0007] This invention has been made in view of the above points, and aims to improve usability when network congestion occurs. [Means for solving the problem]

[0008] According to the disclosed technology, a network node is provided that includes a receiving unit that receives a PDU (Protocol Data Unit) session establishment request relating to a certain terminal from an AMF (Access and Mobility Management Function), a transmitting unit that sends a rejection signal to the AMF instructing it to go via a DCCF (Data Collection Coordination Function), and a control unit that, depending on the congestion state of the DNN (Data Network Name), accesses the DCCF and obtains signal data of the PDU session establishment request relating to the certain terminal. [Effects of the Invention]

[0009] According to the disclosed technology, usability can be improved when network congestion occurs. [Brief explanation of the drawing]

[0010] [Figure 1] This is a diagram illustrating an example of a communication system. [Figure 2] This diagram illustrates an example of a communication system in a roaming environment. [Figure 3] This is a diagram illustrating an example of congestion regulation. [Figure 4] This figure illustrates an example of congestion control in an embodiment of the present invention. [Figure 5] This is a sequence diagram illustrating an example of congestion control in an embodiment of the present invention. [Figure 6] This figure shows an example of the functional configuration of a base station 10 and a network node 30 in an embodiment of the present invention. [Figure 7] This figure shows an example of the functional configuration of terminal 20 in an embodiment of the present invention. [Figure 8] This figure shows an example of the hardware configuration of the base station 10 and terminal 20 in an embodiment of the present invention. [Figure 9] This figure shows an example of the configuration of a vehicle 2001 in an embodiment of the present invention. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to those described below.

[0012] In the operation of the wireless communication system according to the embodiments of the present invention, existing technologies may be used as appropriate. However, such existing technologies include, for example, existing LTE, but are not limited to existing LTE. Furthermore, the term "LTE" as used herein has a broad meaning that includes LTE-Advanced and LTE-Advanced and later methods (e.g., NR), or wireless LAN (Local Area Network), unless otherwise specified.

[0013] Furthermore, in the embodiments of the present invention, "configuring" wireless parameters may mean that predetermined values ​​are pre-configured, or that wireless parameters notified from the network node 30 or terminal 20 are configured.

[0014] Figure 1 is a diagram illustrating an example of a communication system. As shown in Figure 1, the communication system consists of a terminal 20 (UE) and multiple network nodes 30. Hereafter, one network node 30 will be assigned to each function, however, one network node 30 may implement multiple functions, or multiple network nodes 30 may implement one function. Furthermore, the "connection" described below may be a logical connection or a physical connection.

[0015] RAN (Radio Access Network) is a network node 30 having a radio access function, which may include a base station 10, and is connected to UE, AMF (Access and Mobility Management Function) and UPF (User plane function). AMF is a network node 30 having functions such as termination of a RAN interface, termination of a NAS (Non-Access Stratum), registration management, connection management, reachability management, and mobility management. UPF is a network node 30 having functions such as a PDU (Protocol Data Unit) session point for interconnection with an external DN (Data Network), packet routing and forwarding, and user plane QoS (Quality of Service) handling. UPF and DN constitute a network slice. In the wireless communication network according to the embodiment of the present invention, a plurality of network slices are constructed.

[0016] AMF is connected to UE, RAN, SMF (Session Management function), NSSF (Network Slice Selection Function), NEF (Network Exposure Function), NRF (Network Repository Function), UDM (Unified Data Management), AUSF (Authentication Server Function), PCF (Policy Control Function), and AF (Application Function). AMF, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF and AF are network nodes 30 connected to each other via interfaces based on respective services, namely Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf and Naf.

[0017] SMF is a network node 30 that has functions such as session management, IP (Internet Protocol) address allocation and management for UEs, DHCP (Dynamic Host Configuration Protocol) functionality, ARP (Address Resolution Protocol) proxy, and roaming functionality. NEF is a network node 30 that has the function of notifying other NFs (Network Functions) of capabilities and events. NSSF is a network node 30 that has functions such as selecting the network slice to which the UE connects, determining the allowed NSSAI (Network Slice Selection Assistance Information), determining the NSSAI to be set, and determining the AMF set to which the UE connects. PCF is a network node 30 that has the function of controlling network policy. AF is a network node 30 that has the function of controlling application servers. NRF is a network node 30 that has the function of discovering NF instances that provide services. UDM is a network node 30 that manages subscriber data and authentication data. UDM is connected to UDR (User Data Repository) which holds the said data.

[0018] Figure 2 is a diagram illustrating an example of a communication system in a roaming environment. As shown in Figure 2, the network consists of a terminal 20 (UE) and multiple network nodes 30. Hereafter, one network node 30 will be assumed to correspond to each function, however, one network node 30 may implement multiple functions, or multiple network nodes 30 may implement one function. Furthermore, the "connection" described below may be a logical connection or a physical connection.

[0019] RAN is a network node 30 having a radio access function, and is connected to UE, AMF and UPF. AMF is a network node 30 having functions such as termination of a RAN interface, termination of NAS, registration management, connection management, reachability management, and mobility management. UPF is a network node 30 having functions such as a PDU session point for the outside interconnected with DN, packet routing and forwarding, and user plane QoS handling. UPF and DN constitute a network slice. In the radio communication network according to the embodiment of the present invention, a plurality of network slices are constructed.

[0020] AMF is connected to UE, RAN, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF, AF, and SEPP (Security Edge Protection Proxy). AMF, SMF, NSSF, NEF, NRF, UDM, AUSF, PCF and AF are network nodes 30 mutually connected via interfaces based on respective services, namely Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf and Naf.

[0021] SMF is a network node 30 with functions such as session management, UE IP address assignment and management, DHCP functionality, ARP proxy, and roaming functionality. NEF is a network node 30 with the function of notifying other NFs of capabilities and events. NSSF is a network node 30 with functions such as selecting the network slice to which the UE connects, determining the allowed NSSAI, determining the NSSAI to be configured, and determining the AMF set to which the UE connects. PCF is a network node 30 with the function of controlling network policy. AF is a network node 30 with the function of controlling application servers. NRF is a network node 30 with the function of discovering NF instances that provide services. SEPP is an opaque proxy that filters control plane messages between PLMNs (Public Land Mobile Networks). vSEPP shown in Figure 2 is SEPP in the visited network, and hSEPP is SEPP in the home network.

[0022] As shown in Figure 2, the UE is in a roaming environment connected to the RAN and AMF in the VPLMN (Visited PLMN). The VPLMN and HPLMN (Home PLMN) are connected via vSEPP and hSEPP. The UE can communicate with the HPLMN's UDM, for example, via the VPLMN's AMF.

[0023] Figure 3 illustrates an example of congestion regulation. As shown in Figure 3, the UE sends a PDU session establishment request to the AMF. Subsequently, the AMF sends a PDU session establishment request to the SMF. Subsequently, the SMF detects congestion. Subsequently, it sends a rejection with a backoff timer to the AMF. Subsequently, the AMF sends a rejection with a backoff timer to the UE. Subsequently, the UE suppresses connection requests to the same DNN until the backoff timer expires.

[0024] As described above, in order to regulate congestion in the network, when SMF detects congestion in the DNN, it notifies the terminal via AMF of the backoff timer. This function reduces the load on the network side by suppressing signal transmission at the terminal until the backoff timer expires (see Non-Patent Document 1).

[0025] The expiration time of the backoff timer, which is notified to terminals during network congestion, is a trade-off between network load and usability. Therefore, the time until the backoff timer expires must be determined while considering this balance.

[0026] If the backoff timer expires for a long time, the network load decreases, but the downtime is extended, reducing usability. If the backoff timer expires for a short time, the downtime is shortened, but the network load increases. Currently, it is difficult to achieve both improved usability and reduced network load.

[0027] Therefore, during periods of congestion, asynchronous communication via DCCF (Data Collection Coordination Function) is used to at least improve usability.

[0028] Figure 4 is a diagram illustrating an example of congestion control in an embodiment of the present invention. As shown in Figure 4, the UE sends a PDU session establishment request to the AMF. Subsequently, the AMF sends a PDU session establishment request to the SMF. Subsequently, the SMF detects congestion. Subsequently, it sends a reject signal to the AMF indicating to go via DCCF. Subsequently, the AMF sends a reject signal to the UE indicating to go via DCCF. To indicate to go via DCCF, for example, a via-DCCF-flag may be included in the reject signal.

[0029] Next, when the UE receives a rejection signal containing the via-DCCF-flag, it retransmits the PDU session establishment request to the AMF. The AMF then sends the retransmitted PDU session establishment request to the DCCF. The DCCF then stores the PDU session establishment signal data. The DCCF may also store the signal data of the PDU session establishment request.

[0030] Next, the SMF accesses the DCCF according to the congestion status, obtains PDU session establishment signal data, and continues processing. The SMF may also obtain signal data for PDU session establishment requests.

[0031] Figure 5 is a sequence diagram illustrating an example of congestion control in an embodiment of the present invention. In step S101, the UE sends a PDU session establishment request to the AMF. In the following step S102, the AMF sends a PDU session establishment request to the SMF. In the following step S103, the SMF sends a Reject to the AMF indicating to go via DCCF. In the following step S104, the AMF sends a Reject to the UE indicating to go via DCCF.

[0032] In the following step S105, the UE sends a retransmission of the PDU session establishment request to the AMF. In the following step S106, the AMF sends a retransmission of the PDU session establishment request to the DCCF. In the following step S107, the DCCF stores the PDU session establishment signal data. In the following step S108, the SMF retrieves the PDU session establishment signal data from the DCCF according to the congestion status. In the following step S109, the SMF continues the PDU session establishment process for the UE.

[0033] As described above, users can access the network without waiting for the backoff timer to expire. This reduces downtime. Furthermore, SMF can process the network according to the detected congestion state, thereby reducing network load.

[0034] In other words, it can improve usability when network congestion occurs.

[0035] (Device configuration) Next, an example of the functional configuration of the base station 10, network node 30, and terminal 20 that perform the processes and operations described above will be explained. The base station 10, network node 30, and terminal 20 include the functions to perform the embodiments described above. However, the base station 10, network node 30, and terminal 20 may each have only some of the functions in the embodiments. The network node 30 may support the AC, EEC, EDN, EAS, EES, ECS, and core network described above.

[0036] <Base station 10 and network node 30> Figure 6 shows an example of the functional configuration of a base station 10 and a network node 30. As shown in Figure 6, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Figure 6 is merely an example. The functional classifications and names of the functional units can be anything as long as they can perform the operations according to the embodiment of the present invention. The network node 30 may have the same functional configuration as the base station 10. Furthermore, a network node 30 having multiple different functions on the system architecture may be composed of multiple network nodes 30 separated by function.

[0037] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 or other network node 30 and transmitting the signal by wire or wireless. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 or other network node 30 and obtaining information from the received signal, for example, higher layer information. A communication unit including the transmitting unit 110 and the receiving unit 120 may be configured.

[0038] The setting unit 130 stores pre-configured setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads it from the storage device as needed. The content of the setting information is, for example, information related to congestion regulation.

[0039] As described in the embodiment, the control unit 140 performs processing related to congestion control in the network. The control unit 140 also performs processing related to communication with the terminal 20. The signal transmission function of the control unit 140 may be included in the transmission unit 110, and the signal reception function of the control unit 140 may be included in the reception unit 120.

[0040] <Terminal 20> Figure 7 shows an example of the functional configuration of terminal 20. As shown in Figure 7, terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Figure 7 is merely an example. The functional classifications and names of the functional units can be anything as long as they can perform the operations according to the embodiment of the present invention. Furthermore, the communication device that becomes the resource holder 20 may have a functional configuration similar to that of terminal 20.

[0041] The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and obtains signals from higher layers from the received physical layer signals. The receiving unit 220 also has the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals or reference signals transmitted from the network node 30. A communication unit including the transmitting unit 210 and the receiving unit 220 may be configured.

[0042] The configuration unit 230 stores various configuration information received from the network node 30 by the receiving unit 220 in its storage device and reads it from the storage device as needed. The configuration unit 230 also stores pre-configured configuration information. The content of the configuration information includes, for example, information related to congestion regulation.

[0043] The control unit 240 performs processing related to congestion control in the network, as described in the embodiment. The signal transmission function of the control unit 240 may be included in the transmission unit 210, and the signal reception function of the control unit 240 may be included in the reception unit 220.

[0044] (Hardware configuration) The block diagrams (Figures 6 and 7) used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the one or more devices with software.

[0045] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. As mentioned above, the method of implementation is not particularly limited.

[0046] For example, the network node 30, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 8 is a diagram showing an example of the hardware configuration of a base station 10 and terminal 20 according to one embodiment of the present disclosure. The network node 30 may have a hardware configuration similar to that of the base station 10. The base station 10 and terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0047] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0048] Each function in the base station 10 and terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and storage device 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and auxiliary storage device 1003.

[0049] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0050] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 140 of the base station 10 shown in Figure 6 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in Figure 7 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunications line.

[0051] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of this disclosure.

[0052] The auxiliary storage device 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. The above-mentioned storage medium may also be a database, server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0053] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmit / receive antenna, amplifier section, transmit / receive section, transmission path interface, etc., may be implemented by the communication device 1004. The transmit / receive section may be implemented with physically or logically separated transmitting and receiving sections.

[0054] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0055] Furthermore, each device, such as the processor 1001 and the storage device 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0056] Furthermore, the base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0057] Figure 9 shows an example of the configuration of vehicle 2001. As shown in Figure 9, vehicle 2001 comprises a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, for example, to the communication module 2013.

[0058] The drive unit 2002 consists of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel, which is operated by the user.

[0059] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2029 installed in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0060] Signals from various sensors 2021-2029 include current signals from current sensor 2021 which senses motor current, front and rear wheel rotation speed signals obtained by rotation speed sensor 2022, front and rear wheel air pressure signals obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal depression signals obtained by accelerator pedal sensor 2029, brake pedal depression signals obtained by brake pedal sensor 2026, shift lever operation signals obtained by shift lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0061] The Information Services Unit 2012 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001. The Information Services Unit 2012 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0062] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0063] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends and receives data via its communication port 2033 to the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021-29 provided in the vehicle 2001.

[0064] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0065] The communication module 2013 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 2021-2028 input to the electronic control unit 2010, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 2012. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

[0066] The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may also be called an output unit, which outputs information (for example, outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). The communication module 2013 also stores the various information received from the external device in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021-2029, etc., provided in the vehicle 2001.

[0067] (Summary of the embodiments) As described above, according to an embodiment of the present invention, a network node is provided which includes a receiving unit that receives a PDU (Protocol Data Unit) session establishment request relating to a certain terminal from an AMF (Access and Mobility Management Function), a transmitting unit that sends a rejection signal to the AMF indicating that the request should be made via a DCCF (Data Collection Coordination Function), and a control unit that, depending on the congestion state of the DNN (Data Network Name), accesses the DCCF and acquires signal data of the PDU session establishment request relating to the certain terminal.

[0068] With the above configuration, users can access the network without waiting for the backoff timer to expire. This reduces downtime. Furthermore, SMF can process the network according to the detected congestion status, thereby reducing network load. In other words, it improves usability when network congestion occurs.

[0069] When the control unit obtains signal data for a PDU session establishment request relating to a certain terminal, it may continue processing the PDU session establishment request relating to that terminal. With this configuration, users can access the network without waiting for the backoff timer to expire. This reduces downtime. Furthermore, the SMF can process according to the detected congestion state. This reduces the network load.

[0070] Furthermore, according to an embodiment of the present invention, a network node is provided which includes a receiving unit that receives a PDU (Protocol Data Unit) session establishment request from a terminal, and a transmitting unit that transmits the PDU session establishment request to an SMF (Session Management function), wherein the receiving unit receives a rejection signal from the SMF indicating to go via a DCCF (Data Collection Coordination Function), the transmitting unit transmits a rejection signal to the terminal indicating to go via the DCCF, the receiving unit receives a retransmission of the PDU session establishment request from the terminal, and the transmitting unit transmits the retransmission of the PDU session establishment request to the DCCF.

[0071] With the above configuration, users can access the network without waiting for the backoff timer to expire. This reduces downtime. Furthermore, SMF can process the network according to the detected congestion status, thereby reducing network load. In other words, it improves usability when network congestion occurs.

[0072] Furthermore, according to an embodiment of the present invention, a terminal is provided which includes a transmitting unit that transmits a PDU (Protocol Data Unit) session establishment request to an AMF (Access and Mobility Management Function), and a receiving unit that receives a rejection signal for the PDU session establishment request from the AMF, wherein the transmitting unit retransmits the PDU session establishment request to the AMF if the rejection signal indicates that it should be transmitted via a DCCF (Data Collection Coordination Function).

[0073] With the above configuration, users can access the network without waiting for the backoff timer to expire. This reduces downtime. Furthermore, SMF can process the network according to the detected congestion status, thereby reducing network load. In other words, it improves usability when network congestion occurs.

[0074] Furthermore, according to an embodiment of the present invention, a control method is provided in which a network node performs the following steps: receiving a PDU (Protocol Data Unit) session establishment request relating to a certain terminal from an AMF (Access and Mobility Management Function); sending a rejection signal to the AMF indicating that the request should be made via a DCCF (Data Collection Coordination Function); and, depending on the congestion state of the DNN (Data Network Name), accessing the DCCF and obtaining the signal data of the PDU session establishment request relating to the certain terminal.

[0075] With the above configuration, users can access the network without waiting for the backoff timer to expire. This reduces downtime. Furthermore, SMF can process the network according to the detected congestion status, thereby reducing network load. In other words, it improves usability when network congestion occurs.

[0076] (Supplement to the embodiment) While embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0077] Furthermore, the notification of information is not limited to the embodiments / models described herein and may be carried out by other methods. For example, the notification of information may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0078] Each aspect / embodiment described in this disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (where x is, for example, an integer or decimal)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), and IEEE This may apply to at least one system utilizing 802.20, UWB (Ultra-WideBand), Bluetooth®, or other appropriate systems, and to next-generation systems extended, modified, created, or defined based thereon. It may also apply to a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G).

[0079] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0080] In this specification, specific operations performed by the base station 10 may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by the base station 10 and at least one of the other network nodes (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station 10, the other network node may be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0081] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0082] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0083] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0084] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0085] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0086] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0087] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0088] The terms “system” and “network” as used in this disclosure are interchangeable.

[0089] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0090] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0091] In this disclosure, terms such as "base station (BS)", "wireless base station", "base station equipment", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0092] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0093] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform information-based control or operation.

[0094] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0095] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or several other appropriate terms.

[0096] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to a movable object, and its speed of movement is arbitrary. This also includes the case when the mobile body is stationary. The mobile body includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and items mounted on them. The mobile body may also be a mobile body that moves autonomously based on operation commands. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station may include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0097] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminals 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0098] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

[0099] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0100] The terms “connected,” “coupled,” or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0101] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

[0102] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0103] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0104] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0105] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0106] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0107] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0108] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0109] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way. [Explanation of Symbols]

[0110] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 devices 210 Transmitter 220 Receiver 230 Setting section 240 Control Unit 30 network nodes 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A receiving unit that receives a PDU (Protocol Data Unit) session establishment request for a certain terminal from an AMF (Access and Mobility Management Function), A transmission unit that transmits a rejection signal to the AMF instructing it to go via DCCF (Data Collection Coordination Function), A network node having a control unit that accesses the DCCF and acquires signal data for a PDU session establishment request relating to a certain terminal, depending on the congestion status of the DNN (Data Network Name).

2. The network node according to claim 1, wherein the control unit, upon acquiring signal data for a PDU session establishment request relating to a certain terminal, continues processing the PDU session establishment request relating to the certain terminal.

3. A receiving unit that receives a PDU (Protocol Data Unit) session establishment request from a terminal, It includes a transmission unit that transmits the PDU session establishment request to the SMF (Session Management function), The receiving unit receives a rejection signal from the SMF instructing it to go via DCCF (Data Collection Coordination Function), The transmitting unit transmits a rejection signal to the terminal instructing it to go via the DCCF. The receiving unit receives the retransmission of the PDU session establishment request from the terminal, The transmitting unit is a network node that transmits the retransmission of the PDU session establishment request to the DCCF.

4. A transmission unit that sends a PDU (Protocol Data Unit) session establishment request to the AMF (Access and Mobility Management Function), The system includes a receiving unit that receives a rejection signal for the PDU session establishment request from the AMF, The transmitting unit is a terminal that, when the rejection signal indicates to go via DCCF (Data Collection Coordination Function), resends the PDU session establishment request to the AMF.

5. The procedure for receiving a PDU (Protocol Data Unit) session establishment request for a particular terminal from an AMF (Access and Mobility Management Function), A procedure for sending a rejection signal to the AMF instructing it to go via DCCF (Data Collection Coordination Function), A control method in which a network node performs the following steps: access the DCCF according to the congestion status of the DNN (Data Network Name) and obtain signal data for a PDU session establishment request relating to a certain terminal.

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