Network node, terminal and control method

Abstract

A network node is provided with: a reception unit which receives, from an access and mobility management function (AMF), a protocol data unit (PDU) session establishment request relating to a certain terminal, and a transmission unit which transmits the PDU session establishment request to the certain terminal; a transmission unit that transmits, to the AMF, a rejection signal that instructs to pass through a Data Collection Coordination Function (DCCF) (Data Collection Coordination Function), and that transmits, to the AMF, a rejection signal that instructs to pass through the DCCF (Data Collection Coordination Function); and a control unit that accesses the DCCF on the basis of the congestion state of a DNN (Data Network Name), and acquires signal data of the PDU session establishment request relating to the certain terminal.

Description

Technical Field

[0001] This invention relates to network nodes, terminals, and control methods in communication systems. Background Technology

[0002] Within the 3GPP (3rd Generation Partnership Project), research was conducted on a wireless communication method known as 5G or NR (New Radio) to further increase system capacity, accelerate data transmission speeds, and reduce latency in the radio space. In 5G, various wireless technologies were researched to meet the requirements of achieving throughput of over 10Gbps and achieving latency of less than 1ms in the radio space.

[0003] In NR, network architectures including 5GC (5G Core Network) corresponding to the core network EPC (Evolved Packet Core) in the LTE (Long Term Evolution) network architecture and NG-RAN (Next Generation-Radio Access Network) corresponding to the RAN (Radio Access Network) E-UTRAN (Evolved Universal Terrestrial Radio Access Network) in the LTE network architecture were studied (e.g., non-patent literature 1).

[0004] Furthermore, since congestion is restricted in the network, the SMF (Session Management function) notifies the terminal of a backoff timer via the AMF (Access and Mobility Management function) when DNN (Data Network Name) congestion is detected. This allows the terminal to reduce network load by suppressing signal transmission until the backoff timer expires (see Non-Patent Document 1).

[0005] Existing technical documents

[0006] Non-patent literature

[0007] Non-patent document 1: 3GPP TS 23.501 V17.6.0 (2022-09) Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] There is a trade-off between the expiration time of the backoff timer that notifies terminals during congestion and network load and availability. A longer backoff timer expiration time reduces network load but prolongs unavailability, thus decreasing availability. Conversely, a shorter backoff timer expiration time shortens unavailability but increases network load.

[0010] The present invention was made in view of the above-mentioned problems, and its purpose is to improve availability in the event of network congestion.

[0011] Methods for solving problems

[0012] According to the disclosed technology, a network node is provided, comprising: a receiving unit that receives a PDU (Protocol Data Unit) session establishment request related to a certain terminal from an AMF (Access and Mobility Management Function); a sending unit that sends a rejection signal to the AMF indicating a rejection via a DCCF (Data Collection Coordination Function); and a control unit that accesses the DCCF based on the congestion state of a DNN (Data Network Name) and obtains signal data of the PDU session establishment request related to the certain terminal.

[0013] Invention Effects

[0014] The disclosed technology can improve availability in the event of network congestion. Attached Figure Description

[0015] Figure 1 This is a diagram used to illustrate an example of a communication system.

[0016] Figure 2 This is a diagram used to illustrate an example of a communication system in a roaming environment.

[0017] Figure 3 This is a diagram used to illustrate an example of congestion limits.

[0018] Figure 4 This is a diagram illustrating an example of congestion limiting in an embodiment of the present invention.

[0019] Figure 5 This is a timing diagram illustrating an example of congestion limiting in an embodiment of the present invention.

[0020] Figure 6 This is a diagram illustrating an example of the functional structure of a base station 10 and a network node 30 according to an embodiment of the present invention.

[0021] Figure 7 This is a diagram illustrating an example of the functional structure of terminal 20 in an embodiment of the present invention.

[0022] Figure 8 This is a diagram illustrating an example of the hardware structure of the base station 10 and the terminal 20 in an embodiment of the present invention.

[0023] Figure 9 This is a diagram illustrating an example of the structure of a vehicle 2001 according to an embodiment of the present invention. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, the embodiments described below are merely examples, and the application of the present invention is not limited to the embodiments described below.

[0025] In the operation of the wireless communication system according to embodiments of the present invention, existing technologies are appropriately used. These existing technologies include, for example, existing LTE, but are not limited to, existing LTE. Furthermore, unless otherwise stated, the term "LTE" as used herein has a broad meaning that includes LTE-Advanced and subsequent modes (e.g., NR) or wireless LAN (Local Area Network).

[0026] Furthermore, in embodiments of the present invention, the "configuration" of wireless parameters, etc., can be a predetermined value that has been pre-configured, or it can be wireless parameters that have been set and notified from network node 30 or terminal 20.

[0027] Figure 1 This is a diagram used to illustrate an example of a communication system. For example... Figure 1 As shown, the communication system consists of a UE (User Equipment) as terminal 20 and multiple network nodes 30. Hereinafter, one network node 30 is assumed to correspond to each function, but multiple functions can be implemented by one network node 30, or one function can be implemented by multiple network nodes 30. Furthermore, the term "connection" as used below can refer to either a logical connection or a physical connection.

[0028] The RAN (Radio Access Network) is a network node 30 with radio access capabilities, which may include a base station 10 and connect to the UE, AMF (Access and Mobility Management Function), and UPF (User Plane Function). The AMF is a network node 30 with functions such as RAN interface termination, NAS (Non-Access Stratum) termination, registration management, connection management, reachability management, and mobility management. The UPF is a network node 30 with functions such as PDU (Protocol Data Unit) session points interconnected with the DN (Data Network), packet routing and forwarding, and QoS (Quality of Service) processing for the user plane. The UPF and DN constitute a network slice. In the wireless communication network of this embodiment, multiple network slices are constructed.

[0029] The AMF connects with the UE, RAN, SMF (Session Management function), NSSF (Network Slice Selection Function), NEF (Network Exposure Function), NRF (Network Repository Function), UDM (Unified Data Management), ASF (Authentication Server Function), PCF (Policy Control Function), and AF (Application Function). AMF, SMF, NSSF, NEF, NRF, UDM, ASF, PCF, and AF are interconnected network nodes 30 via their respective service-based interfaces Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, and Naf.

[0030] The SMF (Service Provider Function) is a network node 30 with functions such as session management, UE IP (Internet Protocol) address allocation and management, DHCP (Dynamic Host Configuration Protocol) functionality, ARP (Address Resolution Protocol) proxy, and roaming capabilities. The NEF (Network Function Provider Function) is a network node 30 with the ability to notify other NFs (Network Functions) and handle events. The NSSF (Network Slice Selection Assistance Information) is a network node 30 with functions such as selecting the network slice to which the UE connects, determining the allowed NSSAI (Network Slice Selection Assistance Information), determining the configured NSSAI, and determining the set of AMFs to which the UE connects. The PCF (Public Network Function Provider Function) is a network node 30 with the function of controlling network policies. The AF (Application Provider Function) is a network node 30 with the function of controlling application servers. The NRF (Network Provider Function) is a network node 30 with the function of discovering NF instances that provide services. The UDM (User Data Repository) is a network node 30 that manages subscriber data and authentication data. The UDM is connected to the UDR (User Data Repository) that maintains this data.

[0031] Figure 2 This is a diagram illustrating an example of a communication system in a roaming environment. For example... Figure 2 As shown, the network consists of a UE (User Equipment) as terminal 20 and multiple network nodes 30. Hereinafter, one network node 30 is assumed to correspond to each function, but multiple functions can be implemented by one network node 30, or one function can be implemented by multiple network nodes 30. Furthermore, the term "connection" as used below can refer to either a logical connection or a physical connection.

[0032] The RAN is a network node 30 with wireless access capabilities, connected to the UE, AMF, and UPF. The AMF is a network node 30 with functions such as RAN interface termination, NAS termination, registration management, connection management, reachability management, and mobility management. The UPF is a network node 30 interconnected with the DN, with functions such as external PDU session points, packet routing and forwarding, and user plane QoS processing. The UPF and DN constitute a network slice. In the wireless communication network of this embodiment, multiple network slices are constructed.

[0033] AMF connects 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 interconnected via their respective service-based interfaces Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, and Naf.

[0034] The SMF (Service Provider Function) is a network node 30 with functions such as session management, UE IP address allocation and management, DHCP, ARP proxy, and roaming. The NEF (Network Provider Function) is a network node 30 with the ability to notify other NFs and handle events. The NSSF (Network Provider Function) is a network node 30 with functions such as selecting the network slice the UE connects to, determining the allowed NSSAI (Network Service Access Point), determining the configured NSSAI, and determining the set of AMFs the UE connects to. The PCF (Network Service Function) is a network node 30 with the function of performing network policy control. The AF (Application Provider Function) is a network node 30 with the function of controlling application servers. The NRF (Network Provider Function) is a network node 30 with the function of discovering NF instances that provide services. The SEPP (Secure Provider Proxy) is a non-transparent proxy used to filter control plane messages between PLMNs (Public Land Mobile Networks). Figure 2 The vSEPP shown is the SEPP in the visited network, and the hSEPP is the SEPP in the home network.

[0035] like Figure 2 As shown, the UE is in a roaming environment within the VPLMN (Visited PLMN) connected to the RAN and AMF. The VPLMN and HPLMN (Home PLMN) are connected via vSEPP and hSEPP. For example, the UE can communicate with the HPLMN's UDM via the VPLMN's AMF.

[0036] Figure 3 This is a diagram used to illustrate an example of congestion limits. (e.g.) Figure 3 As shown, the UE sends a PDU session establishment request to the AMF. Next, the AMF sends a PDU session establishment request to the SMF. Then, the SMF detects congestion. Next, it sends a rejection message containing a backoff timer to the AMF. Next, the AMF sends a rejection message containing a backoff timer to the UE. Then, in the UE, connection requests to the same DNN are suppressed until the backoff timer expires.

[0037] As described above, since congestion is restricted in the network, the SMF notifies the terminal of the backoff timer via the AMF when it detects congestion in the DNN. This has the function of reducing the load on the network side by suppressing signal transmission in the terminal until the backoff timer expires (see Non-Patent Document 1).

[0038] There is a trade-off between the expiration time of the backoff timer that notifies terminals during congestion and network load and availability. Therefore, a balance needs to be considered to determine the time until the backoff timer expires.

[0039] When the backoff timer expires for a long time, the network load decreases, but the unavailability time increases, thus reducing availability. Conversely, when the backoff timer expires for a short time, the unavailability time decreases, but the network load increases. Currently, it is difficult to balance improving availability with reducing network load.

[0040] Therefore, availability can be improved at least by using asynchronous communication via the DCCF (Data Collection Coordination Function) during congestion.

[0041] Figure 4 This is a diagram illustrating an example of congestion limiting in an embodiment of the present invention. For example... Figure 4 As shown, the UE sends a PDU session establishment request to the AMF. Next, the AMF sends a PDU session establishment request to the SMF. Then, the SMF detects congestion. Next, it sends a rejection signal indicating via the DCCF to the AMF. Then, the AMF sends a rejection signal indicating via the DCCF to the UE. To indicate via the DCCF, for example, the via-DCCF-flag can be included in the rejection signal.

[0042] Next, upon receiving a rejection signal containing the via-DCCF-flag, the UE 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 saves the PDU session establishment signal data. Additionally, the DCCF can save the signal data of the PDU session establishment request itself.

[0043] Next, the SMF accesses the DCCF based on the congestion status, obtains the PDU session establishment signal data, and continues processing. Additionally, the SMF can obtain the signal data for PDU session establishment requests.

[0044] Figure 5This is a timing diagram illustrating an example of congestion limiting in an embodiment of the present invention. Step S101: The UE sends a PDU session establishment request to the AMF. In the next step S102: The AMF sends a PDU session establishment request to the SMF. In the next step S103: The SMF sends a rejection indication via the DCCF to the AMF. In the next step S104: The AMF sends a rejection indication via the DCCF to the UE.

[0045] In the next step S105, the UE retransmits the PDU session establishment request to the AMF. In the next step S106, the AMF retransmits the PDU session establishment request to the DCCF. In the next step S107, the DCCF saves the PDU session establishment signal data. In the next step S108, the SMF retrieves the PDU session establishment signal data from the DCCF based on the congestion state. In the next step S109, the SMF continues the PDU session establishment process for the UE.

[0046] Through the above embodiments, users can access the network without waiting for the backoff timer to expire. This reduces unavailability time. Furthermore, SMF can process congestion based on detected conditions, thereby alleviating network load.

[0047] That is, it can improve availability in the event of network congestion.

[0048] (Device structure)

[0049] Next, an example of the functional structure of the base station 10, network node 30, and terminal 20 performing the processes and actions described above will be explained. The base station 10, network node 30, and terminal 20 include the functions implemented in the above embodiments. However, the base station 10, network node 30, and terminal 20 may each possess only a portion of the functions described in the embodiments. The network node 30 may correspond to the AC, EEC, EDN, EAS, EES, ECS, and core network described above.

[0050] <Base station 10 and network node 30>

[0051] Figure 6 This is a diagram illustrating an example of the functional structure of base station 10 and network node 30. (See diagram for example.) Figure 6 As shown, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130 and a control unit 140. Figure 6The functional structure shown is only one example. The functional distinctions and names of the functional units can be arbitrary, as long as the actions of the embodiments of the present invention can be implemented. Network node 30 can have the same functional structure as base station 10. Furthermore, network nodes 30 with multiple different functions in the system architecture can also be composed of multiple network nodes 30 separated by function.

[0052] 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 via wired or wireless means. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 or other network node 30 and obtaining, for example, higher-level information from the received signals. A communication unit including the transmitting unit 110 and the receiving unit 120 may also be configured.

[0053] The setting unit 130 stores pre-set setting information and various setting information sent to the terminal 20 into a storage device, and reads it from the storage device as needed. The content of the setting information includes, for example, information related to congestion limits.

[0054] As described in the embodiment, the control unit 140 performs processing related to congestion control in the network. Additionally, the control unit 140 performs processing related to communication with the terminal 20. Alternatively, the signal transmission-related functions of the control unit 140 may be included in the transmitting unit 110, and the signal reception-related functions of the control unit 140 may be included in the receiving unit 120.

[0055] Terminal 20

[0056] Figure 7 This is a diagram illustrating an example of the functional structure of terminal 20. (As shown...) Figure 7 As shown, the terminal 20 includes a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. Figure 7 The functional structure shown is only one example. The functional distinctions and names of the functional units can be arbitrary, as long as the operations of the embodiments of the present invention can be implemented. Furthermore, the communication device that becomes the resource holder 20 can also have the same functional structure as the terminal 20.

[0057] The transmitting unit 210 generates a transmission signal based on the transmission data and transmits the signal wirelessly. The receiving unit 220 wirelessly receives various signals and extracts higher-layer signals from the received physical layer signals. Furthermore, the receiving unit 220 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 also be configured.

[0058] The setting unit 230 stores various setting information received by the receiving unit 220 from the network node 30 in a storage device, and reads it from the storage device as needed. In addition, the setting unit 230 also stores preset setting information. The content of the setting information includes, for example, information related to congestion limits.

[0059] As described in the embodiment, the control unit 240 performs processing related to congestion control in the network. Alternatively, the signal transmission-related functions of the control unit 240 may be included in the transmitting unit 210, and the signal reception-related functions of the control unit 240 may be included in the receiving unit 220.

[0060] (Hardware structure)

[0061] The block diagrams used in the description of the above embodiments ( Figure 6 and Figure 7 The diagram illustrates blocks organized by function. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Furthermore, there are no particular limitations on the implementation method of each functional block. That is, each functional block can be implemented using a single device that is physically or logically combined, or by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. Functional blocks can also be implemented by combining software within the aforementioned single or multiple devices.

[0062] The functions include judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that performs the sending function is called a transmitting unit or transmitter. In short, as mentioned above, there are no particular limitations on the implementation method.

[0063] For example, in one embodiment of this disclosure, network node 30, terminal 20, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 8This diagram illustrates an example of the hardware structure of a base station 10 and a terminal 20 according to one embodiment of the present disclosure. The network node 30 may have the same hardware structure as the base station 10. The base station 10 and terminal 20 may also be configured as a computer device that physically includes a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007, etc.

[0064] Additionally, in the following description, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of base station 10 and terminal 20 can be configured to include one or more of the devices shown in the figures, or it can be configured to not include any of them.

[0065] The functions of base station 10 and terminal 20 are implemented by reading predetermined software (program) into hardware such as processor 1001 and storage device 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004 or controls at least one of reading and writing data in storage device 1002 and auxiliary storage device 1003.

[0066] The processor 1001 controls the computer as a whole by instructing the operating system to operate. The processor 1001 may also be a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, the control unit 140 and control unit 240 described above can also be implemented using the processor 1001.

[0067] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage devices 1003 and communication devices 1004, and performs various processes accordingly. As a program, a program is used that causes the computer to perform at least a portion of the actions described in the above embodiments. For example, Figure 6 The control unit 140 of the base station 10 shown can also be implemented by a control program stored in the storage device 1002 and operated in the processor 1001. And, for example, Figure 7 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and operated in the processor 1001. Although it has been described that the various processes described above are executed by one processor 1001, the various processes described above can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be implemented by more than one chip. In addition, the program can also be sent from the network via a telecommunications line.

[0068] Storage device 1002 is a computer-readable recording medium, and may be composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. Storage device 1002 may also be referred to as a register, cache, main memory (main storage device), etc. Storage device 1002 can store programs (program code), software modules, etc., that are executable for implementing the communication method according to one embodiment of this disclosure.

[0069] The auxiliary storage device 1003 is a computer-readable recording medium, such as at least one of the following: CD-ROM (CompactDisc ROM) or other optical discs, hard disks, floppy disks, magneto-optical discs (e.g., compact discs, digital multifunction discs, Blu-ray discs, smart cards, flash memory (e.g., cards, sticks, key drives), floppy disks, magnetic stripes, etc. The aforementioned storage medium may, for example, be a database, server, or other suitable media that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0070] The communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network. It may also be referred to as a network device, network controller, network interface card (NIC), communication module, etc. The communication device 1004 may, for example, be configured to include a high-frequency switch, duplexer, filter, frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, transceiver antennas, amplifiers, transceiver units, transmission path interfaces, etc., can also be implemented using the communication device 1004. The transceiver unit may also be physically or logically separated into a transmitting unit and a receiving unit.

[0071] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED, etc.). Alternatively, input device 1005 and output device 1006 can also be integrated (e.g., a touch panel).

[0072] Furthermore, the processor 1001 and storage device 1002, among other devices, are connected via a bus 1007 for communicating information. The bus 1007 can be a single bus or can be composed of different buses between devices.

[0073] Furthermore, the base station 10 and the terminal 20 can 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), or a FPGA (Field Programmable Gate Array), and can also use this hardware to implement part or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0074] Figure 9 An example of the structure of vehicle 2001 is shown. For example... Figure 9 As shown, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a gearshift 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. The various forms / implementations described in this disclosure can also be applied to communication devices mounted on the vehicle 2001, for example, to the communication module 2013.

[0075] The drive unit 2002 may be composed, for example, an engine, a motor, or a hybrid power system of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a steering wheel) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0076] The electronic control unit 2010 consists of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (I / O port) 2033. Signals from various sensors 2021 to 2029 of the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 can also be referred to as an ECU (Electronic Control Unit).

[0077] The signals from various sensors 2021 to 2029 include current signals from current sensor 2021 that monitors the current of the motor, speed signals of the front and rear wheels obtained by speed sensor 2022, air pressure signals of the front and rear wheels obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal depress signal obtained by accelerator pedal sensor 2029, brake pedal depress signal obtained by brake pedal sensor 2026, gear lever operation signal obtained by gear lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0078] The Information Service Unit 2012 comprises various devices such as a car navigation system, audio system, speakers, television, and radio, used to provide (output) various information such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices. The Information Service Unit 2012 uses information obtained 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 Service Unit 2012 may include input devices that accept input from external sources (such as keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.), and may also include output devices that perform output to external sources (such as displays, speakers, LED lights, touch panels, etc.).

[0079] The Driver Assistance System 2030 comprises various devices used to prevent accidents or reduce driver workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning devices (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyroscope systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. Furthermore, the Driver Assistance System 2030 transmits and receives various information via the communication module 2013 to achieve driver assistance or autonomous driving functions.

[0080] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 2001 via the communication port. For example, the communication module 2013 can send and receive data with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, gear shift lever 2006, front wheel 2007, rear wheel 2008, axle 2009, microprocessor 2031 in the electronic control unit 2010, memory (ROM, RAM) 2032, and sensors 2021 to 29 in the vehicle 2001 via the communication port 2033.

[0081] The communication module 2013, controlled by the microprocessor 2031 of the electronic control unit 2010, is a communication device capable of communicating with external devices. For example, it can transmit and receive various types of information with external devices via wireless communication. The communication module 2013 can be located inside or outside the electronic control unit 2010. External devices can be, for example, base stations, mobile stations, etc.

[0082] The communication module 2013 can also wirelessly transmit at least one of the signals input to the electronic control unit 2010 from the various sensors 2021-2028 described above, the information obtained based on those signals, and the information obtained via the information service unit 2012 based on input from an external source (user) to an external device. The electronic control unit 2010, the various sensors 2021-2028, and the information service unit 2012 can also be referred to as input units that receive input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the aforementioned inputs.

[0083] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) sent from external devices and displays it on the information service unit 2012 of the vehicle 2001. The information service unit 2012 can also be referred to as an output unit (for example, an output unit that outputs information to devices such as displays and speakers based on the PDSCH received by the communication module 2013 (or data / information decoded from the PDSCH)). Furthermore, the communication module 2013 stores the various information received from external devices in a memory 2032 available to the microprocessor 2031. The microprocessor 2031 can also control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, gearshift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021-2029, etc., of the vehicle 2001 based on the information stored in the memory 2032.

[0084] (Summary of implementation methods)

[0085] As described above, according to an embodiment of the present invention, a network node is provided, comprising: a receiving unit that receives a PDU (Protocol Data Unit) session establishment request related to a certain terminal from an AMF (Access and Mobility Management Function); a sending unit that sends a rejection signal to the AMF indicating a rejection via a DCCF (Data Collection Coordination Function); and a control unit that accesses the DCCF based on the congestion state of a DNN (Data Network Name) and obtains signal data of the PDU session establishment request related to the certain terminal.

[0086] With this structure, users can access the network without waiting for the backoff timer to expire, thus reducing downtime. Furthermore, SMF can process detected congestion, thereby alleviating network load and improving availability in the event of network congestion.

[0087] The control unit can also continue processing the PDU session establishment request related to a specific terminal after receiving the signal data. According to this structure, users can access the network without waiting for the backoff timer to expire, thus reducing unavailability time. Furthermore, the SMF can process the detected congestion status, thereby reducing network load.

[0088] Furthermore, according to an embodiment of the present invention, a network node is provided, comprising: a receiving unit that receives a PDU (Protocol Data Unit) session establishment request from a terminal; and a sending unit that sends the PDU session establishment request to an SMF (Session Management function), wherein the receiving unit receives a rejection signal indicating rejection via a DCCF (Data Collection Coordination Function) from the SMF, the sending unit sends the rejection signal indicating rejection via a DCCF to the terminal, the receiving unit receives a retransmission of the PDU session establishment request from the terminal, and the sending unit sends a retransmission of the PDU session establishment request to the DCCF.

[0089] With this structure, users can access the network without waiting for the backoff timer to expire, thus reducing downtime. Furthermore, SMF can process detected congestion, thereby alleviating network load and improving availability in the event of network congestion.

[0090] Furthermore, according to an embodiment of the present invention, a terminal is provided, comprising: 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 from the AMF for the PDU session establishment request, wherein if the rejection signal indicates that the PDU session establishment request is transmitted via a DCCF (Data Collection Coordination Function), the transmitting unit retransmits the PDU session establishment request to the AMF.

[0091] With this structure, users can access the network without waiting for the backoff timer to expire, thus reducing downtime. Furthermore, SMF can process detected congestion, thereby alleviating network load and improving availability in the event of network congestion.

[0092] 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 related to a certain terminal from an AMF (Access and Mobility Management Function); sending a rejection signal to the AMF indicating via the DCCF (Data Collection Coordination Function); and accessing the DCCF according to the congestion state of the DNN (Data Network Name), and obtaining the signal data of the PDU session establishment request related to the certain terminal.

[0093] With this structure, users can access the network without waiting for the backoff timer to expire, thus reducing downtime. Furthermore, SMF can process detected congestion, thereby alleviating network load and improving availability in the event of network congestion.

[0094] (Supplement to the implementation method)

[0095] The embodiments of the present invention have been described above, but the disclosed invention is not limited to such embodiments. Those skilled in the art should understand various modifications, alterations, substitutions, and replacements. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these values ​​are merely examples, and any appropriate values ​​may be used. The distinctions between items in the above description are not essential to the present invention. Items described in two or more items may be combined as needed, and items described in one item may be applied to items described in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. Multiple functional units may be operated by a single physical component, or a single functional unit may be operated by multiple physical components. Regarding the processing described in the embodiments, the order of processing may be interchanged unless there is a contradiction. For ease of explanation, a functional block diagram is used to illustrate the base station 10 and terminal 20, but such a device may also be implemented by hardware, software, or a combination thereof. The software operating according to the embodiments of the present invention via the processor of the base station 10 and the software operating according to the embodiments of the present invention via the processor of the terminal 20 may also be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server and other suitable storage media, respectively.

[0096] Furthermore, the notification of information is not limited to the forms / implementations described in this disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher 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. In addition, RRC signaling may also be referred to as an RRC message, for example, it may be an RRC connection setup message, an RRC connection reconfiguration message, etc.

[0097] The various forms / implementations described in this disclosure can also be applied to systems utilizing 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 (x is, for example, an integer or a 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)), IEEE The system may include at least one of 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), other suitable systems, and next-generation systems based on, modified, created, or specified in these systems. Furthermore, multiple systems may be combined (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.).

[0098] The processing procedures, timing, and flow of the various forms / implementations described in this specification may be rearranged in order, provided there is no contradiction. For example, the elements of various steps are indicated using an illustrative order for the methods described in this disclosure, but are not limited to the specific order indicated.

[0099] In this specification, certain actions performed by base station 10 may sometimes also be performed by its upper node, depending on the circumstances. In a network consisting of one or more network nodes having base station 10, it is obvious that various actions performed to communicate with terminal 20 can be performed by at least one of base station 10 and other network nodes besides base station 10 (e.g., considering MME or S-GW, but not limited to these). The above example illustrates the case where there is one other network node besides base station 10, but other network nodes can also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0100] The information or signals described in this disclosure can be output from a higher (or lower) layer to a lower (or higher) layer. They can also be input or output via multiple network nodes.

[0101] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0102] The determination in this disclosure can be made by a value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by a comparison of numerical values ​​(e.g., a comparison with a predetermined value).

[0103] Software, whether called software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted as referring to commands, command sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0104] In addition, software, commands, and information can also be sent and received via transmission media. For example, when software is sent from a webpage, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of transmission media.

[0105] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc., that may be involved in the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0106] Furthermore, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms that have the same or similar meanings. For example, at least one of the channel and symbol may also be a signal (signaling). Additionally, a signal may also be a message. Furthermore, a component carrier (CC) may also be referred to as carrier frequency, cell, frequency carrier, etc.

[0107] The terms “system” and “network” as used in this disclosure are used interchangeably.

[0108] Furthermore, the information, parameters, etc., described in this disclosure may be represented using absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may also be indicated using indexes.

[0109] The names used for the above parameters are non-limiting in any respect. Furthermore, the formulas, etc., using these parameters sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by all appropriate names, therefore the various names assigned to these channels and information elements are non-limiting in any respect.

[0110] In this disclosure, the terms "base station (BS)," "wireless base station," "base station device," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" are used interchangeably. Sometimes, terms such as macro cell, small cell, femtocell, and picocell are also used to refer to base stations.

[0111] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, its coverage area can be divided into several smaller areas, each of which can provide communication services through a base station subsystem (e.g., a small indoor base station RRH: Remote Radio Head). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0112] In this disclosure, the base station sending information to the terminal can also be replaced by the base station instructing the terminal on information-based control / actions.

[0113] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" can be used interchangeably.

[0114] For mobile stations, those skilled in the art sometimes also use the following terms: 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, handheld device, user agent, mobile client, client, or some other appropriate terms.

[0115] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a communication device, etc. Furthermore, at least one of the base station and the mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to an object capable of movement, with an arbitrary speed. This also includes situations where the mobile body is stationary. Examples of mobile bodies include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, shovel cars, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, rear cars, rickshaws, ships and other watercraft, airplanes, rockets, artificial satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted on them. Additionally, the mobile body can also be a mobile body that moves autonomously based on operating commands. This can be a means of transportation (such as a car, airplane, etc.), a mobile entity that moves unmanned (such as a drone, self-driving car, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and mobile station may also include devices that do not necessarily move during communication. For example, at least one of the base station and mobile station may be an IoT (Internet of Things) device such as a sensor.

[0116] Furthermore, the base station in this disclosure can also be replaced by a user terminal. For example, the communication between the base station and the user terminal can be replaced by communication between multiple terminals 20 (e.g., D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), and various forms / implementations of this disclosure can also be applied. In this case, the terminal 20 can also be configured to have the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, uplink channel, downlink channel, etc., can also be replaced with side channel.

[0117] Similarly, the user terminal in this disclosure can also be replaced by a base station. In this case, the base station can also be configured to have the functions of the aforementioned user terminal.

[0118] The terms "determining" and "determining" as used in this disclosure sometimes encompass a variety of actions. For example, "determining" or "determining" may include actions such as judging, calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), and ascertaining, which are considered as actions of "determining" or "determining." Furthermore, "determining" or "determining" may include actions such as receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, and accessing (e.g., accessing data in memory), which are considered as actions of "determining" or "determining." Additionally, "determining" or "determining" may include actions such as resolving, selecting, choosing, establishing, and comparing, which are considered as actions of "determining" or "determining." That is, "judgment" and "decision" can include matters that are considered as having been "judged" or "decided". In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0119] The terms “connected,” “coupled,” or any variations thereof are intended to indicate any direct or indirect connection or combination between two or more elements, including cases where there is one or more intermediate elements between the two elements that are “connected” or “coupled.” The combination or connection between elements can be physical, logical, or a combination of these. For example, “access” can be used instead of “connected.” In the context of this disclosure, it can be understood that two elements are “connected” or “coupled” to each other using at least one of one or more wires, cables, and printed electrical connections, and, as some non-limiting and non-inclusive examples, using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible regions) to “connect” or “couple” to each other.

[0120] The reference signal can be simply called RS (Reference Signal), or, depending on the standard applied, pilot.

[0121] As used in this disclosure, the word "based on" does not mean "based on only" unless otherwise expressly stated. In other words, the word "based on" means both "based on only" and "based on at least".

[0122] Any reference to elements using the designations "first," "second," etc., as used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, references to the first and second elements do not imply that only two elements can be taken, or that in any form the first element must precede the second element.

[0123] Alternatively, the "unit" in the structure of the above devices can be replaced with "section", "circuit", "equipment", etc.

[0124] When the terms "include," "including," and their variations are used in this disclosure, these terms, like the term "comprising," imply inclusion. Furthermore, the term "or" as used in this disclosure does not refer to XOR.

[0125] In this disclosure, for example, in cases where articles are added through translation, such as in English (e.g., a, an, and the), this disclosure also includes cases where the noun following these articles is in a plural form.

[0126] In this disclosure, the phrase "A and B are different" can mean "A and B are not the same." Additionally, this phrase can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0127] The various forms / implementations described in this disclosure can be used individually or in combination, and can be switched depending on the execution. Furthermore, the notification of predetermined information (e.g., a "It is X" notification) is not limited to being explicit, but can also be implicit (e.g., not being notified of the predetermined information).

[0128] The present disclosure has been described in detail above, but 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 as modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the present disclosure is for illustrative purposes only and is not intended to be limiting.

[0129] Label Explanation

[0130] 10 base stations

[0131] 110 Dispatch Department

[0132] 120 Receiving Department

[0133] 130 Setting Department

[0134] 140 Control Department

[0135] 20 terminals

[0136] 210 Sending Department

[0137] 220 Receiving Department

[0138] 230 Setting Department

[0139] 240 Control Department

[0140] 30 network nodes

[0141] 1001 processor

[0142] 1002 Storage device

[0143] 1003 Auxiliary storage device

[0144] 1004 Communication device

[0145] 1005 Input Device

[0146] 1006 Output Device

Claims

1. A network node having: The receiving unit receives a PDU session establishment request related to a certain terminal from the AMF, where AMF refers to Access and Mobility Management Function, and the PDU session establishment request refers to Protocol Data Unit session establishment request. The transmitting unit sends a rejection signal to the AMF via the DCCF, whereby the DCCF refers to the Data Collection Coordination Function; and The control unit accesses the DCCF based on the congestion status of the DNN and obtains the signal data of the PDU session establishment request related to a certain terminal, where the DNN refers to the data network name.

2. The network node according to claim 1, wherein, Upon receiving signal data for the PDU session establishment request related to a certain terminal, the control unit continues processing the PDU session establishment request related to that terminal.

3. A network node having: The receiving unit receives a PDU session establishment request from the terminal, wherein the PDU session establishment request refers to a Protocol Data Unit session establishment request; and The sending unit sends the PDU session establishment request to the SMF, where SMF refers to the Session Management Function. The receiving unit receives a rejection signal from the SMF via the DCCF, where DCCF refers to the Data Collection Coordination Function. The transmitting unit sends the rejection signal indicating DCCF to the terminal. The receiving unit receives a retransmission of the PDU session establishment request from the terminal. The sending unit retransmits the PDU session establishment request to the DCCF.

4. A terminal, comprising: The transmitting unit sends a PDU session establishment request to the AMF (Access and Mobility Management Function), whereby the AMF is a Protocol Data Unit session establishment request; and The receiving unit receives a rejection signal from the AMF regarding the PDU session establishment request. If the rejection signal indicates that the PDU session establishment request is sent to the AMF via the DCCF (Data Collection Coordination Function), the sending unit will retransmit the PDU session establishment request to the AMF.

5. A control method in which a network node performs the following steps: Receive a PDU session establishment request related to a certain terminal from the AMF, where AMF refers to Access and Mobility Management Function, and PDU session establishment request refers to Protocol Data Unit session establishment request; Send a rejection signal to the AMF via the DCCF, whereby the DCCF refers to the Data Collection Coordination Function; and Based on the congestion status of the DNN, the system accesses the DCCF and obtains the signal data of the PDU session establishment request related to a certain terminal. The DNN refers to the data network name.

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