Terminal, base station and network node

Abstract

A network node has: a reception unit that receives, from a session management node, a message requesting storage of a control signal transmitted from a mobility management node to the session management node; a transmission unit that transmits, to the mobility management node, a message requesting transmission of the control signal to the device; and a control unit that stores the control signal received from the mobility management node, and the transmission unit transmits the control signal to the session management node in response to a request from the session management node.

Description

TECHNICAL FIELD

[0001] The present application relates to a terminal, a base station, and a network node in a communication system. BACKGROUND

[0002] In 3GPP (registered trademark) (3rd Generation Partnership Project: 3rd Generation Partnership Project), research on a wireless communication system (hereinafter, referred to as "5G" or "NR") called 5G or NR (New Radio: New Radio) is being conducted in order to achieve further large capacity of system capacity, further high speed of data transmission speed, further low delay in a wireless section, and the like. In 5G, in order to meet the requirement conditions of achieving a throughput of 10 Gbps or more and making the delay in a wireless section 1 ms or less, research on various wireless technologies is being conducted.

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

[0004] PRIOR ART DOCUMENT

[0005] NON-PATENT LITERATURE

[0006] Non-Patent Literature 1: 3GPP TS 23.501 V18.1.0 (2023-03)

[0007] Non-Patent Literature 2: 3GPP TS 23.288 V18.1.0 (2023-03)

[0008] Non-Patent Literature 3: 3GPP TS 24.501 V18.2.1 (2023-03)

[0009] Non-Patent Literature 4: 3GPP TS 29.574 V18.1.0 (2023-03)

[0010] Non-Patent Literature 5: 3GPP TS 29.575 V18.1.0 (2023-03)

[0011] Non-Patent Literature 6: 3GPP TS 29.518 V18.1.0 (2023-03)

[0012] Non-Patent Literature 7: 3GPP TS 38.413 V17.4.0 (2023-03)

[0013] Non-Patent Literature 8: 3GPP TS 38.331 V17.4.0 (2022-12) SUMMARY

[0014] PROBLEMS TO BE SOLVED BY THE INVENTION

[0015] In 6G, which is the next generation of 5G, improving the congestion tolerance of the core network is one of the problems.

[0016] The present invention was made in view of the above problems, and aims to improve the congestion tolerance of the core network.

[0017] MEANS FOR SOLVING THE PROBLEMS

[0018] According to the disclosed technology, a network node has: a reception unit that receives, from a session management node, a message requesting storage of a control signal transmitted from a mobility management node to the session management node; a transmission unit that transmits, to the mobility management node, a message requesting transmission of the control signal to the device; and a control unit that stores the control signal received from the mobility management node, the transmission unit transmitting the control signal to the session management node in response to a request from the session management node.

[0019] EFFECT OF THE INVENTION

[0020] According to the disclosed technology, the congestion tolerance of the core network can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a diagram for explaining an example of a communication system.

[0022] Figure 2 is a diagram for explaining an example of a communication system in a roaming environment.

[0023] Figure 3 is a diagram showing an example of a first timing chart in an embodiment of the present invention.

[0024] Figure 4 is a diagram showing an example of a second timing chart in an embodiment of the present invention.

[0025] Figure 5This is a diagram illustrating an example of the functional structure of the base station 10 and network node 30 in an embodiment of the present invention.

[0026] Figure 6 This is a diagram illustrating an example of the functional structure of terminal 20 in an embodiment of the present invention.

[0027] Figure 7 This is a diagram illustrating an example of the hardware structure of the base station 10, terminal 20, and network node 30 in an embodiment of the present invention.

[0028] Figure 8 This is a diagram illustrating an example of the structure of a vehicle 2001 according to an embodiment of the present invention. Detailed Implementation

[0029] 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.

[0030] 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).

[0031] 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.

[0032] 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, each function is assumed to correspond to one network node 30, 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.

[0033] The RAN (Radio Access Network) is a network node 30 having a radio access function, and can include a base station 10, which is connected with a UE, an AMF (Access and Mobility Management Function), and a UPF (User plane function). The AMF is a network node 30 having a function of terminating a RAN interface, a function of terminating a NAS (Non-Access Stratum), a function of registration management, a function of connection management, a function of reachability management, a function of mobility management, and the like. The UPF is a network node 30 having a function of a PDU (Protocol Data Unit) session point for an external, a function of packet routing and forwarding, a function of QoS (Quality of Service) processing of a user plane, and the like, which are connected with a DN (Data Network). The UPF and the DN constitute a network slice. In the wireless communication network of the embodiment of the present application, a plurality of network slices are constructed.

[0034] The AMF is connected with a UE, a RAN, an SMF (Session Management function), an NSSF (Network Slice Selection Function), an NEF (Network Exposure Function), an NRF (Network Repository Function), a UDM (Unified Data Management), an AUSF (Authentication Server Function), a PCF (Policy Control Function), and an AF (Application Function). The AMF, the SMF, the NSSF, the NEF, the NRF, the UDM, the AUSF, the PCF, and the AF are network nodes 30 which are connected with each other via interfaces based on respective services, that is, Namf, Nsmf, Nnssf, Nnef, Nnrf, Nudm, Nausf, Npcf, and Naf.

[0035] The SMF is a network node 30 having functions of session management, IP (Internet Protocol) address allocation and management of a UE, DHCP (Dynamic Host Configuration Protocol) function, ARP (Address Resolution Protocol) proxy, roaming function, and the like. The NEF is a network node 30 having a function of notifying capabilities and events to other NFs (Network Functions). The NSSF is a network node 30 having functions of selecting a network slice to which a UE is connected, deciding an allowed NSSAI (Network Slice Selection Assistance Information), deciding a set NSSAI, deciding a set of AMFs to which the UE is connected, and the like. The PCF is a network node 30 having a function of performing policy control of a network. The AF is a network node 30 having a function of controlling an application server. The NRF is a network node 30 having a function of discovering a service-providing NF instance. The UDM is a network node 30 managing subscriber data and authentication data. The UDM is connected with a UDR (User Data Repository) that holds the data.

[0036] Figure 2 is a diagram for explaining an example of a communication system in a roaming environment. As shown in Figure 2 , the network is composed of a UE that is a terminal 20, and a plurality of network nodes 30. Hereinafter, it is assumed that each function is corresponded to by one network node 30, but a plurality of functions can be implemented by one network node 30, and one function can be implemented by a plurality of network nodes 30. In addition, the "connection" described below can be a logical connection, or a physical connection.

[0037] The RAN is a network node 30 having a radio access function, and is connected with the UE, the AMF, and the UPF. The AMF is a network node 30 having functions of termination of a RAN interface, termination of NAS, registration management, connection management, reachability management, mobility management, and the like. The UPF is a network node 30 having functions of a PDU session point to the outside, routing and forwarding of packets, QoS handling of a user plane, and the like, and is interconnected with the DN. The UPF and the DN constitute a network slice. In the wireless communication network of the present embodiment, a plurality of network slices are constructed.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In addition, Figure 1 as well as Figure 2 In this network, there exists a DCCF (Data Collection Coordination Function) as one of the network nodes 30. The DCCF, for example, has the function of sending data collected upon request. For details regarding the DCCF, please refer to Non-Patent Document 2. Furthermore, an AMF or a network node with the same function can be referred to as a Mobility Management Node, an SMF or a network node with the same function as a Session Management Node, and a DCCF or a network node with the same function as a Data Management Node.

[0042] (Example 1)

[0043] Example 1 is explained. In Example 1, an action in a core network for improving congestion tolerance is shown. Figure 3 is a diagram showing an example of a first timing chart in an embodiment of the present application. As a prior setting, in addition to the "Normal Set", a "Congestion Set" is newly defined as a timer related to session management, that is, an SM NAS timer (refer to Non-Patent Literature 3, Section 10.3 Timers of 5GS session management). The terminal 20 uses the SM NAS timer belonging to the "Congestion Set" in a case where information indicating that the SM NAS communication mode is changed to the congestion time is received through broadcast information (for example, SIB1). Hereinafter, the processing of each step of Figure 3 is explained.

[0044] Step S151: The SMF detects a congestion state.

[0045] Step S152: The SMF transmits a message Ndccf_DataManagement_Subscribe to the DCCF. The Ndccf_DataManagement_Subscribe is a message that requests notification subscription of the UL SM NAS signal. For details, refer to Non-Patent Literature 4, Section 5.1.3.4. The Ndccf_DataManagement_Subscribe includes an information element (IE) NdccfDataSubscription (refer to Non-Patent Literature 4, Section 5.1.3.4).

[0046] The NdccfDataSubscription includes an information element dataSub (refer to Non-Patent Literature 5, Section 5.1.6.2.8, DataSubscription). The dataSub includes an information element amfDataSub (refer to Non-Patent Literature 6, Section 6.2.6.2.3, AmfEventSubscription). The amfDataSub includes an information element eventList (refer to Non-Patent Literature 6, Section 6.2.6.2.3, AmfEventSubscription). The eventList includes an information element type (refer to Non-Patent Literature 6, Section 6.2.6.3.3, AmfEvent). The value of the type is set to a newly defined value (for example, "UL SM NAS forwarding").

[0047] Further, the NdccfDataSubscription includes an information element formatInstruct (refer to Non-Patent Literature 4, section 5.1.6.2.6, FormatttingInstruction). The formatInstruct includes a newly defined information element consTrigNotif_without fetch instruction, and the value is set to 1. In a case where the value of the consTrigNotif_without fetch instruction is set to 1, the DCCF does not send the Fetch instruction for causing the SMF to acquire information to the SMF, and the SMF requests the DCCF to acquire information at a timing in consideration of the congestion state. On the other hand, in a case where the value of the existing information element consTrigNotif is set to 1, the DCCF sends the Fetch instruction for causing the SMF to acquire information to the SMF.

[0048] Further, the NdccfDataSubscription includes an information element targetNfId (refer to Non-Patent Literature 4, section 5.1.6.2.6, FormatttingInstruction). The targetNfId is set with the NF instance ID of the SMF itself.

[0049] Step S153: The DCCF sends a message Namf_EventExposure_Subscribe to all AMFs (refer to Non-Patent Literature 6, section 5.3.2.2).

[0050] The Namf_EventExposure_Subscribe includes an information element AmfCreateEventSubscription (refer to Non-Patent Literature 6, section 6.2.6.2.12).

[0051] The AmfCreateEventSubscription includes an information element subscription (refer to Non-Patent Literature 6, section 6.2.6.2.2, AmfEventSubscription). The subscription includes an information element eventList (refer to Non-Patent Literature 6, section 6.2.6.2.3, AmfEvent). The information element eventList includes type (refer to Non-Patent Literature 6, section 6.2.6.3.3, AmfEventType). The value of the type (AmfEventType) is the value set in step S152 (“UL SM NAS forwarding”).

[0052] Further, the subscription includes a newly defined information element delegatingNfId, which is set to the NF instance ID of the SMF set in step S152.

[0053] Step S154: The AMF transmits a message Overload Start to all base stations 10 (see Non-Patent Literature 7, Section 8.7.7). The Overload Start is used for notification of signal load reduction in the AMF in the existing specification, but is newly used for notification of signal load reduction in the SMF here. The Overload Start includes a newly defined information element SMFOverload Response. The SMF Overload Response includes a newly defined information element SMF OverloadAction. The SMF Overload Action is set to a value for broadcasting a change in the SM NAS communication mode at the time of congestion (for example, "SM NAS communication mode change broadcast at the time of congestion").

[0054] Step S155: The base station 10 transmits a message SIB1 (System Information Block 1) to the terminal 20. For details of the SIB1, see Non-Patent Literature 8. The SIB1 includes a newly defined information element for notifying a change to the SM NAS communication mode at the time of congestion, and the value of the information element is set to a value indicating a change to the SM NAS communication mode at the time of congestion (for example, "SM NAS communication mode change at the time of congestion").

[0055] Next, the process following step S155 is described. Figure 4 is a drawing illustrating an example of a second timing chart in the embodiment of the present application. Hereinafter, the process of each step of Figure 4 is described.

[0056] Step S161: The terminal 20 receives the broadcast information (SIB1) transmitted by the base station 10 in step S155 of Figure 3 .

[0057] Step S162: The terminal 20 performs setting of the SM-NAS timer using the congestion set.

[0058] Step S163: The terminal 20 transmits a PDU session establishment request to the AMF. As shown in step S162, the message of the PDU session establishment request contains information indicating that the setting of the SM-NAS timer using the congestion-time set is performed in the terminal 20 (for example, "via-DCCF indication (due to data transmitted from the AMR to the SMF via the DCCF)" or "congestion-time set in use" and the like). The PDU session establishment request can be referred to as control information.

[0059] Step S164: The AMF selects an SMF.

[0060] Step S165: As shown in step S153 of Figure 3

[0061] Step S166: The AMF recognizes that the setting of the SM-NAS timer using the congestion-time set is performed in the terminal 20 (for example, "via-DCCF indication" explained in step S163). That is, in the congestion time, the terminal 20 prolongs the time (signal exchange time between the SMF and the terminal 20) in which the terminal 20 waits for a response to the control information such as the PDU session establishment request transmitted by the terminal 20 to the SMF via the AMF by setting to prolong the SM-NAS timer. In addition, in the case where the terminal 20 cannot use the SM-NAS timer using the congestion-time set (cannot prolong the timer), the AMF can transmit the control information to the SMF to continue the processing without going through the DCCF. In this case, the SMF can transmit a reject to the AMF according to the congestion state.

[0062] Step S167: The AMF transmits a Namf_EventExposure_Notify to the DCCF in correspondence with the subscription message (Namf_EventExposure_Subscribe) received in step S153 of Figure 3

[0063] ​​The Namf_EventExposure_Notify includes an information element AmfEventNotification (see 6.2.6.2.4 in Non-Patent Literature 6). The AmfEventNotification includes an information element reportList (see 6.2.6.2.5 in Non-Patent Literature 6). The reportList includes an information element type (see 6.2.6.3.3 in Non-Patent Literature 6). The value of the type is Figure 3 The reportList includes a newly defined information element UL SM NAS Container. The UL SM NAS Container includes the PDU Session Establishment Request received in step S163.

[0064] Namely, the AMF forwards the PDU Session Establishment Request (control information) received from the terminal 20 to the DCCF.

[0065] The DCCF stores (saves) the UL SM NAS Container including the PDU Session Establishment Request received from the AMF together with the NF instance ID of the SMF (identifier of the SMF) selected by the AMF in step S164.

[0066] Step S168: The SMF sends the Ndccf_DataManagement_Fetch request to the DCCF at a timing at which the congestion is not worsened (see 5.1.6.2.5 in Non-Patent Literature 4). Namely, the SMF sends a message requesting to acquire the control information such as the PDU Session Establishment Request to the DCCF according to the state of the congestion.

[0067] Step S169: The DCCF sends the Ndccf_DataManagement_Fetch response to the SMF.

[0068] The Ndccf_DataManagement_Fetch response includes an information element dataReports (see NotifSummaryReport in 5.1.6.2.9 in Non-Patent Literature 4). The dataReports include a newly defined information element UL SM NAS Container. The UL SM NAS Container includes the PDU Session Establishment Request included in the Namf_EventExposure_Notify received in step S167.

[0069] Step S170: The SMF performs processing for the PDU Session Establishment Request included in the Ndccf_DataManagement_Fetch response received in step S169.

[0070] Step S171: The SMF transmits a result of processing performed on the PDU session establishment request to the AMF.

[0071] By the above-described embodiments, the congestion tolerance of the core network can be improved. The reason for this is that the SMF, by notifying the DCCF that congestion is detected, can acquire data via the DCCF at a timing at which the congestion is not worsened, instead of receiving data directly from the AMF. Here, the notification transmitted by the SMF to the DCCF includes a request to cause a signal transmitted from a plurality of network nodes (AMF, etc.) belonging to a specific functional category to the SMF to be transmitted to the DCCF at the time of congestion.

[0072] (Apparatus structure)

[0073] Next, a functional structure example of the base station 10, the network node 30, and the terminal 20 that perform the processes and actions described above will be described. The base station 10, the network node 30, and the terminal 20 include the functions of the above-described embodiments. However, the base station 10, the network node 30, and the terminal 20 can each have only a part of the functions of the embodiments.

[0074] <Base station 10 and network node 30>

[0075] Figure 5 is a diagram showing an example of the functional structure of the base station 10 and the network node 30. As shown in Figure 5 , the base station 10 has a transmission section 110, a reception section 120, a setting section 130, and a control section 140. Figure 5 The functional structure shown in the drawing is merely an example. As long as the actions of the embodiments of the present application can be implemented, the functional division and the names of the functional sections can be arbitrary. The network node 30 can have the same functional structure as the base station 10. In addition, the network node 30 having a plurality of different functions in the system architecture can also be composed of a plurality of network nodes 30 separated by function.

[0076] The transmission section 110 includes a function of generating a signal to be transmitted to the terminal 20 or another network node 30 and transmitting the signal through a wire or wirelessly. The reception section 120 includes a function of receiving various signals transmitted from the terminal 20 or another network node 30 and acquiring, for example, higher layer information from the received signal. A communication section including the transmission section 110 and the reception section 120 can also be constituted.

[0077] The setting section 130 stores setting information set in advance and various setting information transmitted to the terminal 20 in a storage device and reads out from the storage device as necessary.

[0078] As explained in the embodiment, the control section 140 performs processing relating to the notification of congestion. In addition, the control section 140 performs processing relating to communication of the terminal 20. The functional section relating to signal transmission in the control section 140 can be included in the transmission section 110, and the functional section relating to signal reception in the control section 140 can be included in the reception section 120.

[0079] <terminal 20>

[0080] Figure 6 is a diagram showing an example of the functional structure of the terminal 20. As shown in Figure 6 , the terminal 20 has a transmission section 210, a reception section 220, a setting section 230, and a control section 240. Figure 6 The functional structure shown in the diagram is merely an example. The functional division and the names of the functional sections can be arbitrary as long as the actions of the embodiments of the present application can be implemented. Furthermore, the communication device that becomes the resource holder 20 can have the same functional structure as the terminal 20.

[0081] The transmission section 210 generates a transmission signal from transmission data and transmits the transmission signal in a wireless manner. The reception section 220 receives various signals in a wireless manner and acquires signals of higher layers from the received physical layer signals. In addition, the reception section 220 has a function of receiving a control signal, a reference signal, and the like transmitted from the network node 30. A communication section including the transmission section 210 and the reception section 220 can be configured.

[0082] The setting section 230 stores various setting information received by the reception section 220 from the network node 30 in a storage device and reads out the setting information from the storage device as necessary. In addition, the setting section 230 also stores setting information set in advance.

[0083] As explained in the embodiment, the control section 240 performs processing relating to the notification of congestion. The functional section relating to signal transmission in the control section 240 can be included in the transmission section 210, and the functional section relating to signal reception in the control section 240 can be included in the reception section 220.

[0084] (Hardware structure)

[0085] The block diagrams used in the explanation of the above embodiments Figure 5 and Figure 6) show blocks in units of functions. These functional blocks (structural units) 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 can be realized by one device that is physically or logically integrated, or can be realized by two or more devices that are physically or logically separated and connected directly or indirectly (for example, using wire, wireless, or the like). Each functional block can also be realized by combining software in one device or in the plurality of devices.

[0086] The functions include judging, deciding, determining, calculating, computing, processing, deriving, investigating, searching, recognizing, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, supposing, expecting, considering, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that functions to transmit is called a transmitting unit or a transmitter. In general, as described above, the method of realization is not particularly limited.

[0087] For example, the base station 10, the network node 30, the terminal 20, and the like of one embodiment of the present disclosure can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 7 is a diagram illustrating an example of a hardware structure of the base station 10 and the terminal 20 of one embodiment of the present disclosure. The network node 30 can have the same hardware structure as the base station 10. The above-described base station 10 and terminal 20 can also be configured as a computer device that physically includes the processor 1001, the storage 1002, the auxiliary storage 1003, the communication device 1004, the input device 1005, the output device 1006, the bus 1007, and the like.

[0088] In addition, in the following description, the expression "device" can be replaced with "circuit", "device", "unit", and the like. The hardware structure of the base station 10 and the terminal 20 can be configured to include one or more of each of the illustrated devices, or can be configured not to include a part of the devices.

[0089] Each function in the base station 10 and the terminal 20 is realized by reading a predetermined software (program) into a hardware such as the processor 1001, the storage 1002, and causing the processor 1001 to perform an operation, and controlling at least one of communication of the communication device 1004 or reading and writing of data in the storage 1002 and the auxiliary storage 1003.

[0090] The processor 1001 controls the entire computer by, for example, causing an operating system to operate. The processor 1001 can also be constituted by a central processing device (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the control section 140, the control section 240, and the like described above can also be realized by the processor 1001.

[0091] Further, the processor 1001 reads a program (program code), a software module, or data, and the like from at least one of the auxiliary storage 1003 and the communication device 1004 to the storage 1002, and performs various processes in accordance therewith. As the program, a program that causes a computer to perform at least a part of the operations described in the above-described embodiments is used. For example, Figure 5 The control section 140 of the base station 10 illustrated can also be realized by a control program stored in the storage 1002 and operating in the processor 1001. Also, for example, Figure 6 The control section 240 of the terminal 20 illustrated can also be realized by a control program stored in the storage 1002 and operating in the processor 1001. Although it is described that the above-described various processes are executed by one processor 1001, the above-described various processes can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be realized by one or more chips. In addition, the program can also be transmitted from a network via a telecommunication line.

[0092] The storage 1002 is a computer-readable recording medium, and can also be constituted by at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), and the like. The storage 1002 can also be referred to as a register, a cache, a main storage (main storage device), and the like. The storage 1002 can hold a program (program code), a software module, and the like that can be executed in order to implement a communication method related to one embodiment of the present disclosure.

[0093] The auxiliary storage device 1003 is a computer-readable recording medium, and can be constituted by at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a Key drive), a Floppy (registered trademark) disk, a magnetic stripe, and the like. The above-described storage medium can be, for example, a database, a server, and other appropriate medium including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0094] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and can also be referred to as a network device, a network controller, a network card, a communication module, and the like. The communication device 1004 can also be constituted to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transceiving antenna, an amplification section, a transceiving section, a transmission path interface, and the like can also be realized by the communication device 1004. The transceiving section can also be realized by a transmission section and a reception section, which are physically or logically separated.

[0095] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, and the like) that performs output to the outside. In addition, the input device 1005 and the output device 1006 can also be integrally constituted (for example, a touch panel).

[0096] Furthermore, the processor 1001 and each of the devices such as the storage device 1002 are connected by a bus 1007 for communicating information. The bus 1007 can be constituted by a single bus, or can be constituted by different buses between the devices.

[0097] Furthermore, the base station 10 and the terminal 20 can be configured to include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), or the like, and a part or all of the functional blocks can be implemented by the hardware. For example, the processor 1001 can be implemented using at least one of these hardware.

[0098] Figure 8 A configuration example of a vehicle 2001 is shown. As shown, the vehicle 2001 has a drive section 2002, a steering section 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 section 2010, various sensors 2021 to 2029, an information service section 2012, and a communication module 2013. The forms / embodiments described in the present disclosure can also be applied to the communication device mounted on the vehicle 2001, for example, to the communication module 2013. Figure 8

[0099] The drive section 2002 is configured of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering section 2003 includes at least a steering wheel (also referred to as a steering handle), and is configured to steer at least one of the front wheels and the rear wheels based on an operation of the steering wheel operated by a user.

[0100] The electronic control section 2010 is configured of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (I / O port) 2033. Signals from the various sensors 2021 to 2029 possessed by the vehicle 2001 are input to the electronic control section 2010. The electronic control section 2010 can also be referred to as an ECU (Electronic Control Unit).

[0101] ​As signals from various sensors 2021 to 2029, there are a current signal from a current sensor 2021 that monitors the current of the motor, a rotational speed signal of the front wheels and the rear wheels acquired by a rotational speed sensor 2022, a pneumatic pressure signal of the front wheels and the rear wheels acquired by a pneumatic pressure sensor 2023, a vehicle speed signal acquired by a vehicle speed sensor 2024, an acceleration signal acquired by an acceleration sensor 2025, a depression amount signal of the accelerator pedal acquired by an accelerator pedal sensor 2029, a depression amount signal of the brake pedal acquired by a brake pedal sensor 2026, an operation signal of the shift lever acquired by a shift lever sensor 2027, a detection signal for detecting obstacles, vehicles, pedestrians, and the like acquired by an object detection sensor 2028, and the like.

[0102] The information service section 2012 is constituted by various devices for providing (outputting) various information such as driving information, traffic information, entertainment information, and the like, and one or more ECUs that control these devices, such as a car navigation system, an audio system, a speaker, a television, a radio, and the like. The information service section 2012 provides various multimedia information and multimedia services to the occupants of the vehicle 2001 using information acquired from external devices via the communication module 2013 and the like. The information service section 2012 can include an input device that accepts input from the outside (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, and the like), and can include an output device that implements output to the outside (for example, a display, a speaker, an LED lamp, a touch panel, and the like).

[0103] The driving assistance system section 2030 is constituted by various devices for providing a function of preventing accidents or reducing the driving load on the driver, such as a millimeter wave radar, a LiDAR (Light Detection and Ranging), a camera, a positioner for positioning (for example, a GNSS and the like), map information (for example, a high-definition (HD) map, an autonomous vehicle (AV) map, and the like), a gyro system (for example, an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), and the like), an AI (Artificial Intelligence) chip, an AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system section 2030 transmits and receives various information via the communication module 2013, and implements a driving assistance function or an autonomous driving function.

[0104] The communication module 2013 can communicate with the microprocessor 2031 and the constituent elements of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data between the drive section 2002, the steering section 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheels 2007, the rear wheels 2008, the axles 2009, the microprocessor 2031 and the memory (ROM, RAM) 2032 within the electronic control section 2010, and the sensors 2021 to 2029 possessed by the vehicle 2001 via the communication port 2033.

[0105] The communication module 2013 can be controlled by the microprocessor 2031 of the electronic control section 2010, and is a communication device that can communicate with external devices. For example, various information is transmitted and received between the external devices via wireless communication. The communication module 2013 can be located inside or outside the electronic control section 2010. The external devices can also be base stations, mobile stations, and the like, for example.

[0106] The communication module 2013 can also transmit at least one of the signals input to the electronic control section 2010 from the various sensors 2021 to 2028 described above, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service section 2012 to the external devices via wireless communication. The electronic control section 2010, the various sensors 2021 to 2028, the information service section 2012, and the like can also be referred to as input sections that accept input. For example, the PUSCH transmitted by the communication module 2013 can include information based on the above input.

[0107] The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, and the like) transmitted from the external devices, and displays it on the information service section 2012 possessed by the vehicle 2001. The information service section 2012 can also be referred to as an output section that outputs information (for example, outputs information to a display, a speaker, and the like based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013) to a device. In addition, the communication module 2013 stores the various information received from the external devices in the memory 2032 available to the microprocessor 2031. The microprocessor 2031 can also control the drive section 2002, the steering section 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheels 2007, the rear wheels 2008, the axles 2009, the sensors 2021 to 2029, and the like possessed by the vehicle 2001 based on the information stored in the memory 2032.

[0108] (SUMMARY OF EMBODIMENTS)

[0109] According to the embodiment of the present application, there is provided a network node including a receiving section that receives a message requesting storage of a control signal transmitted from a mobility management node to the session management node from a session management node, a transmitting section that transmits a message requesting transmission of the control signal to the mobility management node to the session management node, and a control section that stores the control signal received from the mobility management node, the transmitting section transmitting the control signal to the session management node in response to the request from the session management node.

[0110] With the above-described configuration, it is possible to improve the congestion tolerance of the core network.

[0111] The control section stores the control signal together with an identifier of the session management node.

[0112] Further, according to the embodiment of the present application, there is provided a network node including a transmitting section that, after transmitting a message requesting storage of a control signal transmitted from a mobility management node to the network node to a data management node upon detection of congestion, transmits a message requesting acquisition of the control signal to the data management node in accordance with a state of the congestion, and a receiving section that receives the control signal from the data management node.

[0113] With the above-described configuration, it is possible to improve the congestion tolerance of the core network.

[0114] Further, according to the embodiment of the present application, there is provided a network node including a receiving section that receives a message requesting storage of a control signal transmitted from a mobility management node to the session management node from a session management node, a transmitting section that transmits a message requesting transmission of the control signal to the mobility management node to the session management node, and a control section that stores the control signal received from the mobility management node, the transmitting section transmitting the control signal to the session management node in response to the request from the session management node.

[0115] With the above-described configuration, it is possible to improve the congestion tolerance of the core network.

[0116] Further, according to the embodiment of the present application, there is provided a terminal including a receiving section that receives broadcast information containing a notification of transmission of a control signal in a communication mode at a time of congestion from a base station, a control section that performs setting of a timer using the communication mode at the time of congestion, and a transmitting section that transmits the control signal containing information indicating use of the timer of the communication mode at the time of congestion to a mobility management node.

[0117] With the above-described configuration, it is possible to improve the congestion tolerance of the core network.

[0118] Further, according to an embodiment of the present application, there is provided a base station having: a reception section that receives, from a mobility management node, a message that requests transmission of broadcast information to a terminal, the broadcast information including a notification of performing transmission of a control signal in a communication mode at the time of congestion; and a transmission section that transmits the broadcast information to the terminal.

[0119] With the above-described structure, it is possible to improve the congestion tolerance of the core network.

[0120] (Supplement to Embodiments)

[0121] The above describes embodiments of the present application, but the disclosed application is not limited to such embodiments, and those skilled in the art will understand various modifications, changes, alternatives, substitutions, and the like. The above description uses specific numerical examples for facilitating understanding of the application, but these numerical examples are only examples, and any appropriate value can be used unless specifically indicated. The above description does not necessarily distinguish between the items, and two or more items described in one item can be combined as needed, or an item described in one item can be applied to an item described in another item (as long as there is no contradiction). The boundaries of functional blocks or processing blocks in the functional block diagram do not necessarily correspond to the boundaries of physical components. The actions of multiple functional blocks can be performed by one physical component, or the actions of one functional block can be performed by multiple physical components. The order of the processes described in the embodiments can be changed as long as there is no contradiction. The base station 10 and the terminal 20 are described using a functional block diagram for facilitating the description of the processes, but such devices can also be implemented by hardware, software, or a combination thereof. Software that acts according to the embodiments of the present application by the processor of the base station 10 and software that acts according to the embodiments of the present application by the processor of the terminal 20 can each be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an EPROM, an EEPROM, a register, a hard disk (HDD), a removable disk, a CD-ROM, a database, a server, and any other appropriate arbitrary storage medium.

[0122] Further, the notification of the information is not limited to the forms / embodiments explained in the present disclosure, and can be performed using other methods. For example, the notification of the information can 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 a combination thereof. Further, the RRC signaling can also be referred to as an RRC message, for example, can be an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0123] The forms / embodiments described in this disclosure can also be applied to at least one of systems using 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 an integer, a fraction, etc.), 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 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other appropriate systems, and next-generation systems extended, modified, created, and specified based on these systems. In addition, a plurality of systems (for example, at least one of LTE and LTE-A and 5G, etc.) can be combined and applied.

[0124] For the processes, timing, flow, and the like of the forms / embodiments described in this specification, the order can be changed without contradiction. For example, for the methods described in this disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0125] In the present specification, specific actions performed by the base station 10 are sometimes also performed by an upper node thereof, as appropriate. In a network constituted by one or a plurality of network nodes having the base station 10, it is obvious that various actions performed for communication with the terminal 20 can be performed by at least one of the base station 10 and other network nodes (for example, consider an MME or an S-GW or the like, but not limited to these) other than the base station 10. In the above, a case where the other network node other than the base station 10 is one is exemplified, but the other network node can also be a combination of a plurality of other network nodes (for example, an MME and an S-GW).

[0126] Information or a signal and the like explained in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It can also be input or output via a plurality of network nodes.

[0127] Information and the like input or output can be saved in a specific location (for example, a memory), and can be managed using a management table. Information and the like input or output can be rewritten, updated, or appended. Information and the like output can also be deleted. Information and the like input can also be transmitted to other apparatuses.

[0128] Determination in the present disclosure can be performed by a value (0 or 1) represented by 1 bit, by a Boolean value (true or false), or by comparison of numerical values (for example, comparison with a predetermined value).

[0129] As for software, regardless of being called software, firmware, middleware, microcode, hardware description language, or by another name, it should be broadly interpreted as meaning a command, a command set, code, a code segment, program code, a program, a subprogram, a software module, an application, a software application, a software package, a routine, a sub routine, an object, an executable file, an execution thread, a procedure, a function, and the like.

[0130] In addition, software, commands, information, and the like can also be transmitted and received via a transmission medium. For example, in a case where software is transmitted from a web page, a server, or another remote source using at least one of wired technology (a coaxial cable, an optical fiber cable, a twisted pair cable, a digital subscriber line (DSL), and the like) and wireless technology (infrared rays, microwaves, and the like), at least one of these wired technology and wireless technology is included in the definition of the transmission medium.

[0131] The information, signals, and / or the like described in the present disclosure can be represented using various different technologies and / or techniques. For example, data, commands, instructions, information, signals, bits, symbols, chips, and / or the like that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0132] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure can be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol can also be a signal (signaling). Also, a signal can be a message. Also, a component carrier (CC) can be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

[0133] The terms "system" and "network" used in the present disclosure can be used interchangeably.

[0134] In addition, the information, parameters, and / or the like described in the present disclosure can be represented using absolute values, relative values with respect to predetermined values, or corresponding other information. For example, a radio resource can be indicated using an index.

[0135] The names used for the above-described parameters are non-limiting names in any respect. Furthermore, the formulas and / or the like using these parameters are sometimes different from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, and / or the like) and information elements can be identified by all appropriate names, and thus various names assigned to the various channels and information elements are non-limiting names in any respect.

[0136] In the present 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", "component carrier", and / or the like can be used interchangeably. The base station is sometimes referred to as a macro cell, a small cell, a femto cell, a pico cell, and / or the like.

[0137] A base station can accommodate one or plural (for example, 3) cells. In a case where a base station accommodates plural cells, the coverage area of the base station as a whole can be divided into plural smaller areas, and each of the smaller areas can also be provided with a communication service by a base station subsystem (for example, a small-sized base station RRH: Remote Radio Head for indoor use). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides a communication service in the coverage range.

[0138] In the present disclosure, the base station transmitting information to the terminal can also be replaced with the base station instructing the terminal of a control / action based on the information.

[0139] In the present disclosure, the terms "mobile station (MS)", "user terminal (user terminal)", "user equipment (UE)", "terminal", and the like can be used interchangeably.

[0140] For a mobile station, the following terms are also used by those skilled in the art: 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 some other suitable terminology.

[0141] At least one of the base station and the mobile station can also be referred to as a transmission device, a reception device, a communication device, or the like. In addition, at least one of the base station and the mobile station can also be a device mounted on a moving body, the moving body itself, or the like. The moving body refers to an object that can move, and the moving speed is arbitrary. In addition, of course, a case where the moving body is stopped is also included. The moving body includes, for example, a vehicle, a transport vehicle, an automobile, a motorcycle, a bicycle, a connected car, a shovel car, a bulldozer, a wheel loader, a dump truck, a forklift, a train, a bus, a rear car, a rickshaw, a ship and other watercraft, an airplane, a rocket, an artificial satellite, a drone (registered trademark), a multicopter, a quadcopter, a balloon, and an object mounted thereon, and is not limited thereto. In addition, the moving body can also be a moving body that autonomously travels based on a travel instruction. It can be a vehicle (for example, a car, an airplane, or the like), a moving body that moves in a unmanned manner (for example, a drone, a self-driving car, or the like), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station can be an IoT (Internet of Things) device such as a sensor.

[0142] In addition, the base station in the present disclosure can also be replaced with a user terminal. For example, a structure in which communication between the base station and the user terminal is replaced with communication between a plurality of terminals 20 (for example, can also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), or the like) can also apply the forms / embodiments of the present disclosure. In this case, it can also be configured such that the terminal 20 has the functions of the base station 10 described above. In addition, the expressions such as "uplink" and "downlink" can also be replaced with expressions corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, the downlink channel, and the like can also be replaced with a side channel.

[0143] Likewise, the user terminal in the present disclosure can also be replaced with a base station. In this case, it can also be configured such that the base station has the functions of the user terminal described above.

[0144] The terms "determining" and "deciding" as used in the present disclosure also include a variety of actions. For example, "determining" and "deciding" can include actions such as "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up" (searching, inquiring), for example, in tables, databases or other data structures, "ascertaining" matters that have been "determined", "decided", and the like. Further, "determining" and "deciding" can include actions that have been "received" (for example, receiving information), "transmitted" (for example, transmitting information), "input", "output", "accessed" (for example, accessing data in a memory), and the like, as matters that have been "determined", "decided", and the like. Further, "determining" and "deciding" can include actions that have been "resolved", "selected", "chosen", "established", "compared", and the like, as matters that have been "determined", "decided", and the like. That is, "determining" and "deciding" can include actions that have been "determined", "decided", and the like, as matters that have been "determined", "decided", and the like. Further, "determining" and "deciding" can be replaced by "assuming", "expecting", "considering", and the like.

[0145] The terms "connected" and "coupled" or all modifications thereof mean all possible direct or indirect connections or couplings between the elements, which can include the existence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between the elements can be a physical or logical coupling or connection, or a combination thereof. For example, "connected" can be replaced by "accessed". In the present disclosure, it can be considered that two elements are "connected" or "coupled" to each other using at least one of a wire, a cable, and a printed electric connection, and as some non-limiting and non-inclusive examples, electromagnetic energy having a wavelength in the radio frequency region, the microwave region, and the light region (including both visible and invisible) is used to "connect" or "couple" to each other.

[0146] The reference signal can be simply referred to as RS (Reference Signal), and can be referred to as Pilot according to the applied standard.

[0147] The expression "based on" as used in the present disclosure is not intended to mean "only based on" unless specifically stated otherwise. In other words, the expression "based on" means both "only based on" and "at least based on".

[0148] Any reference to elements using the expressions "first", "second", and the like used in the present disclosure does not necessarily limit the number or the order of the elements. These expressions can be used in the present disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in any form.

[0149] The expression "unit" in the structure of each of the above-described apparatuses can be replaced with the expression "section", "circuit", "device", or the like.

[0150] When the expressions "include", "including", and variations thereof are used in the present disclosure, these expressions mean the same as the expression "comprising". Also, the expression "or" used in the present disclosure does not mean the exclusive or.

[0151] In the present disclosure, in the case where the expression "a", "an", and "the" are added by translation, for example, as in English, the present disclosure also includes the case where the noun following these expressions is plural.

[0152] In the present disclosure, the expression "A and B are different" can mean "A and B are mutually different". In addition, this expression can also mean "A and B are different from C, respectively". The expressions "separate", "combine", and the like can also be interpreted in the same way as "different".

[0153] Each form / implementation described in the present disclosure can be used alone, or in combination, and can also be used with switching in conjunction with execution. In addition, the notification of predetermined information (for example, the notification of "X") is not limited to being performed explicitly, and can also be performed implicitly (for example, without performing the notification of the predetermined information).

[0154] The above has been described in detail with respect to the present disclosure, but it should be clear to those skilled in the art that the present disclosure is not limited to the implementations described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate, and the present disclosure does not have any limiting meaning.

[0155] Label Explanation

[0156] 10 base station

[0157] 110 transmission section

[0158] 120 reception section

[0159] 130 setting section

[0160] 140 control section

[0161] 20 terminal

[0162] 210 transmission section

[0163] 220 reception section

[0164] 230 setting section

[0165] 240 control section

[0166] 30 network node

[0167] 1001 processor

[0168] 1002 storage device

[0169] 1003 auxiliary storage device

[0170] 1004 communication device

[0171] 1005 input device

[0172] 1006 output device

[0173] 2001 vehicle

[0174] 2002 drive section

[0175] 2003 steering section

[0176] 2004 accelerator pedal

[0177] 2005 brake pedal

[0178] 2006 gear lever

[0179] 2007 front wheel

[0180] 2008 rear wheel

[0181] 2009 axle

[0182] 2010 electronic control section

[0183] 2012 information service section

[0184] 2013 communication module

[0185] 2021 current sensor

[0186] 2022 rotation speed sensor

[0187] 2023 air pressure sensor

[0188] 2024 vehicle speed sensor

[0189] 2025 acceleration sensor

[0190] 2026 brake pedal sensor

[0191] 2027 gear lever sensor

[0192] 2028 object detection sensor

[0193] 2029 accelerator pedal sensor

[0194] 2030 driving assistance system section

[0195] 2031 microprocessor

[0196] 2032 memory (ROM, RAM)

[0197] 2033 communication port (I / O port)

Claims

1. A network node, comprising: a reception section that receives a message requesting storage of a control signal transmitted from a mobility management node to the session management node, from a session management node; a transmission section that transmits a message requesting transmission of the control signal to the device, to the mobility management node; and a control section that stores the control signal received from the mobility management node, the transmission section transmits the control signal to the session management node in response to a request from the session management node.

2. The network node according to claim 1, wherein the control section stores the control signal together with an identifier of the session management node.

3. A network node, comprising: a transmission section that, after transmitting a message requesting storage of a control signal transmitted from a mobility management node to the device, to a data management node, upon detection of congestion, transmits a message requesting acquisition of the control signal, to the data management node, according to a state of the congestion; and a reception section that receives the control signal from the data management node.

4. A network node, comprising: a reception section that receives a message requesting transmission of a control signal to be transmitted to a session management node at the time of congestion, to the data management node, from a data management node; and a transmission section that transmits a message requesting transmission of broadcast information to a terminal, to a base station, the broadcast information containing a notification of transmission of the control signal in a communication mode at the time of congestion, the reception section receives the control signal transmitted in the communication mode at the time of congestion, from the terminal, the transmission section forwards the control signal to the data management node.

5. A terminal, comprising: a reception section that receives broadcast information containing a notification of transmission of a control signal in a communication mode at the time of congestion, from a base station; a control section that performs setting of a timer using the communication mode at the time of congestion; and a transmission section that transmits the control signal containing information indicating use of the timer of the communication mode at the time of congestion, to a mobility management node.

6. A base station, comprising: a reception section that receives a message requesting transmission of broadcast information to a terminal, from a mobility management node, the broadcast information containing a notification of transmission of a control signal in a communication mode at the time of congestion; and a transmission section that transmits the broadcast information to the terminal. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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